₦airaland Forum

Effective application of dendritic polyurethane coating in top coating.
Background.
Coating for automobile,ship,airsapce, due to expose in the environment, such as water,high temperature,dust,smoke, moisture, dust, chemical corrosion and acid precipitation,coating surface will be destroyed.
Automobile industry use protective transparent coating in the coating surface to reduce the impact of exposure in the environment.,mostly transparent coating is acrylic resin,such as thermosetting acrylic resins based onpolyacrylic acid / melamine resin,gel coating epoxy resin or single or double component polyurethane coating in liquid or powder form.
Disadvantages of traditional coating:
Easily scratching, chipping or damaged due to cleaning and maintenance, easily being effected by weathering, environmental conditions, production and distribution process.
Improved performance：
(1)long-term weather resistance(2) self-cleaning and easy removal of dust(3) high scratch resistance (up to 6H pencil hardness)(4) high chemical resistance (more than 1500 times friction of methyl ketone B on surface without damage (5) hydrophobic (close to or more than 90 degrees to 100 degrees of the water contact angle (6) high gloss (92.2)(7) excellent gloss retention( long-term UV-protection performance (9) the sag resistance (presence of nanoparticles)(10) higher scratch resistance compared to the Ceramiclear (PPG, Pittsburgh, PA).Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers（CYD-CR111/CYD-CR236/CYD-CR486/CYD-CV11）

PAMAM as gene carrier to enhance transfer efficiency.
PAMAM with DNA can form stable compound, the complex entered by cellular endocytosis into the cell, DNA fight against lysosomal degradation, PAMAM internal multistage amine has good buffer capacity to protect the DNA, and released DNA under the acid conditions to achieve the purpose of transfer. Amidization is easy, by controlling the amount of octadecadienoic acid chloride, grafting it with dendrimer to form the external hydrophobic and internal hydrophilic dendrimer, it can well combinate with DNA in gene transfer process, thereby improving the efficiency of gene transfer. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Preparation and Transfer Efficiency of Modified PAMAM Dendrimer Gene Delivery" Liu Junan, Wei Xiaolei, Jiang Hong, Zhong Wenzhong, College of Science,Huazhong Agricultural University, Wuhan 430070,China;Hubei Nanxing Chemical General Facory,Zhijiang 43200,China.

4. Applicatioin of dendrimer-based multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield.
Currently used chemical depressurizing and stimulation methods including: conventional acidifying, retarder acidifying, surfactant injection, shrink swelling agent injection, thermochemical technologies injection system. Dendrimer-based multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield can effectively solve disadvantages of traditional agent in application of ultra-low permeability oilfield. (1) acid-rock reaction speed is too fast, the penetration distance is short, resulting in ineffective acidification and short period of measures .(2)Surfactant adsorption capacity is big in the near-well place, thus does not reach far wellbore, reducing the effect of the active agent. (3) The injected chemicals is not compatible with the formation fluid and produced new precipitate, resulting in decreased permeability. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from “Multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield’’, application number: 201210200334.4 Application (patent) by: Yangtze University address: 434020 Hubei Jingzhou South Loop on the 1st applicant: China PetroChina Changqing Oilfield Company ultra-low permeability reservoir research center inventor: Luo Yue, Chang Yanrong, Yang Huan, Shao Dong bo, Zhang Jianguo etal.

Dendrimers in the field of crude oil demulsification and viscosity has excellent application. Using divergent to synthesize polyamide-amine dendrimer with ethylenediamine core, especially assessed demulsification performance of PAMAM for the O/W type simulated oil emulsion, and also performance on heavy oil viscosity reduction. The results showed that whole generation PAMAM have good demulsification effect, where 3.0-generation PAMAM at 45 ℃, dosage of 100mg / L, breaking time 60min, the demulsification rate was 80%. Half-generation PAMAM had certain viscosity reducing effect, at 70 ℃, dosage of 0.6%, viscosity reduction time 60min, the viscosity reduction rate was 28.2%. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Demulsification and visbreaking of dendrimers on crude oil" Li Cuiqin, Wang Jun, Yang Hongjun, Yang Peifa, Daqing Petroleum Institute, Daqing, Heilongjiang College of Chemistry and Chemical Engineering

Good mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure.
Hyperbranched polyesters can be widely used in coatings, either as direct additives, curing agent or as coating substrate, have shown superior performance compared with conventional additives . Introduction of about 1% of hydroxyl-terminated hyperbranched polyester , PU physical and mechanical properties improved significantly. The tensile strength of polyester PU increased 18.2 times compared to PU without hyperbranched polyester; hyperbranched polyester with modified double bonds in the UV-curable coatings has outstanding performance. Such as coatings of flexible material, it shows excellent resistance to oxygen permeability, making oxygen permeability of the PET and PP increased by 2.3 times and 15 times, in addition, adhesion is good on the PET and PP packaging substrate , has broad application prospects. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from “Preparation and mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure” Zhang Jie, Hu Chunpu* ( School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China)

1. Hyperbranched polyurethane water dispersion has good performance in coating applications.
Waterborne coatings uses water as the medium, thereby resources is rich, price is cheap, easy to get and non-combustible. Polyurethane waterborne coatings have good water dispersibility, stability, film-forming, adhesion, gloss and solvent resistance performance etc. Adding hyperbranched polymer has the following advantages: (1) low viscosity, some end groups used for curing, shorten the curing time and increase the crosslinking density of the cured film and the film properties; (2) the particle diameter of the water dispersion is about 100nm, and the hyperbranched polyurethane shows good dispersibility and stability in water; (3) The resin has excellent physical and film-forming property , impact resistance achieve maximum 50cm, also choose the right formula varnish according to different drying ways. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "synthesis of hyperbranched polyurethane water dispersion and performance thereof" Wang Li, Tang Jinwei, Tong Shenyi, Wuhan Engineering University, Hubei new reactor and Green Chemical Technology key Laboratory, Wuhan 430074) modern Paint & Finishing, 2007,4 (10),14-16

Superior performance of dendrimers based pesticide composition.
Dendrimer-based pesticide composition is a amphipathic substance (hydrophilic group and a hydrophobic group), the composition is in the form of concentrate, when being diluted with water, it forms small particles (micelles). Compared to the previous compositions, the insecticidal properties of the composition has been significantly improved, as in the control of pests, bioavailability, and other soil mobility, the composition can control the pests. Thus, pesticide compositions can be combined with one or more of the active ingredient, or different compound, to improve bioavailability of pesticides or pesticide formulations, reduce metabolism, reduce toxicity, increased chemical or photochemical stability, increase soil mobility.Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendrimer-based resin molded products have broad application prospects.
Dendrimers have promising application in touch panel of household electrical appliances, or mobile phones, game consoles, sound recorders, laptop computers and other machines operating department and other various resin molded products, in particular, relates to a resin molding material and the surface protection film-integrated insert molding resin. Now in the market, film surface is curved or angled which is easy to crack. In order to prevent cracking, approach used to improve flexibility will lead to lower hardness, intolerant abrasions. Dendritic polymer resin molding is to provide a product with sufficient surface hardness, and the film insert molding integrally without cracking occurs and have excellent in appearance. As the special cavity structure and functional group of dendrimer,it may be used to provide a film insert molding, i.e. in the molding there’s no cracking or bleaching, is excellent in scratch resistance of the surface.Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Effective application of dendrimer-based mesoporous catalyst in hydrogenation reaction of unsaturated hydrocarbons.
Nanoparticles are easily oxidized and agglomerating in the application and storage, thus affecting its catalytic activity and selectivity. A lot of catalysts have excellent catalytic performance are often homogeneous catalysts, which brings enormous waste and pollution for catalyst recovery and utilization. To meet the lubricants requiremens of high-quality,energy saving, extending oil change period and low emissions, base oil is required to have a low viscosity, low volatility, high viscosity index, excellent oxidation stability characteristics.Dendrimer-based mesoporous catalyst compared with the prior technology has significant features and progress: a) nanoparticles protected by inorganic-organic shell have stable performance; 2) convenient recycling and non pollution ; 3) can be recycled; 4) controllable reaction rate and selectivity. The result has proved that the dendrimer Pd-Gn-mesoporous catalyst has higher catalytic activity of the hydrogenation, the reaction activity can be controlled by different type of catalyst, and the selectivity of saturated hydrocarbons increased with the generation increases, raised from 79% of 1 generation to 93.4% and 91.4% of 3,4-generation, thus inhibiting the byproduct production of ketone, which has important practical significance on catalytic hydrogenation.In contrast to homogeneous catalyts, catalytic activity has been improved, selectivity is 20% higher than heterogeneous catalysts (75%).Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Application of dendrimers in slow release pesticide

Compared with ordinary pesticide, slow release pesticide with dendrimers have following advantages: 1) solubility to decrease dosage 2) reduce pesticide loss in the environment to enchance the utilizatioin ratio 3) increase adhesion and retention of pesticide on plants, prolong retention time 4) Increase penetration to the plants and insects to improve pesticide effect 5）Control pesticide release speed to have functional and energy saving pesticide 6）Long term effect by one time usage 7） Resistance to rain, weather and improve environmental stability

Example as following:
Dendritic polymers were used as pesticide carriers to mix with dichlorophenoxyacetic acid (2,4-D). The result showed dendritic polymers can well coat herbicide 2,4-D. Further crop experiments showed that the pesticide with dendritic polymers as carriers had good slow release performance. Compared with the traditional pesticide,the dendritic pesticide performance was increased by 2-4 times, and had excellent resistance to rain, weather and other environmental. The slow release pesticide can be controlled at slowed-release period and release time can be increased up to 1-3 months. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendritic polymers have obvious application advantages and prospect.

In the production of controlled released fertilizer, changing processing methods can obtain controlled release fertilizer of different application way as dendritic polymers have special cavity structures and functional surface groups, the fertilizer has long release time and active ingredient is uniformly released, it’s biodegradable and environment friendly, there’s nitrogen in the degradable product that can be absorbed by the plants. Such as:
Application 1:
It can replace traditonal sealants and used as toughening agents for the ourter resin of the sulfur coated controlled release fertilizer, compared to the traditional sealants, dosage is less but performance is good, it can not only increase the strength but also decrease the coating void, thus realizing effect release, besides, it’s degradable and won’t pollute the earth.
Application 2:
As coating material, it’t won’t need porogen or less dosage is ok, itself is nanopore structure and have long release time, the release effect is uniform, the coaitng has good impact and tensile strength, can be coated uniformly.
Application 3:
Used as carriers for fertilizer. Dendrimers have void space to coat the fertilizer, i.e use dendrimers as additives to mix with fertilizer, coat the fertilizer in the cavity of dendrimers, and then it can be effectively released, which meant to prepare dendritic controlled release fertilizer. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendritic polymers have obvious application advantages and prospect.

In the production of controlled released fertilizer, changing processing methods can obtain controlled release fertilizer of different application way as dendritic polymers have special cavity structures and functional surface groups, the fertilizer has long release time and active ingredient is uniformly released, it’s biodegradable and environment friendly, there’s nitrogen in the degradable product that can be absorbed by the plants. Such as:
Application 1:
It can replace traditonal sealants and used as toughening agents for the ourter resin of the sulfur coated controlled release fertilizer, compared to the traditional sealants, dosage is less but performance is good, it can not only increase the strength but also decrease the coating void, thus realizing effect release, besides, it’s degradable and won’t pollute the earth.
Application 2:
As coating material, it’t won’t need porogen or less dosage is ok, itself is nanopore structure and have long release time, the release effect is uniform, the coaitng has good impact and tensile strength, can be coated uniformly.
Application 3:
Used as carriers for fertilizer. Dendrimers have void space to coat the fertilizer, i.e use dendrimers as additives to mix with fertilizer, coat the fertilizer in the cavity of dendrimers, and then it can be effectively released, which meant to prepare dendritic controlled release fertilizer. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendritic metallic nanostructures for fuel cell have good performance.
Fuel cells are new energy conversion technology used in portable electronic devices, stationary power generation and automotive applications, wherein the polymer electrolyte membrane (PEM) fuel cells than conventional fuel battery have the following advantages: flexibility in operating conditions, can quickly change the output power, durable, simple system, so it is the first choice of the car for the power source. The results showed that under the conditions of the PEM fuel cell, the tree platinum sheet than the conventional platinum catalyst has much higher catalytic activity and durability. Under 75 hours at 0.5v, during the test period of constant electric potential use, the performance of platinum black decreased by 47%, while the performance of platinum sheet fell only 33%. More importantly, in the durability test, at 75 hours of operation test, it only declined 19% (1.2A/cm2 to 0.97A/cm2), meanwhile platinum black MEA dropped 43% (1.25A / cm2 to 0.71A/cm2). Dendrimers (CYD-ND193/CYD-ND311/CYD-ND537) have broad application prospects at platinum catalyst for fuel cell due to the durability. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendrimers as thermoplastic toughening agents have great performance.
Dendrimers (CYD-PR121/CYD-PR256/CYD-PV121/CYD-PV256) as toughening agents for thermosetting material (bismaleimide BMI) have the following advantages: low viscosity, can reduce the processing viscosity of BMI system, ease of processing, more easily compatible with BMI. Methods: Acetylating its active end group by modification, to avoid its reaction with BMI system. BMI + HBP dissolved in allyl phenol solvent, and then stirred and heated to 145 ℃, the clear homogeneous solution was prepared, degassed and added to the preheated mold to solidify, 150 ° C (5 h), 200 ° C (3 h), 250 ° C (3 h). When the dosage of dendrimer is 9%, elongation at break can reach the maximum of 138%, toughening performance was increased by 15.9% compared with linear polyesters, meanwhile, system without dendritic polymers as toughening agent, the elongation at break could not be determined, thus no toughness. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendrimers can significantly improve the mechanical property of epoxy system.
A small amount of hydroxyl groups of dendrimer (CYD-CR111/CYD-CR236/CYD-CV111/CYD-CV486) react with epoxy curing system to form a three dimensional network structure. Blending with the epoxy system by a simple physical method, due to the special structure of the molecule as well as physical interactions with epoxy matrix, it can significantly improve the mechanical properties of epoxy systems. (1) at low temperature (77 K) hydroxy terminated dendrimers can improve the tensile strength and impact strength of epoxy resins, with mass fraction of 10% of hydroxy-terminated dendrimer, compared to the pure epoxy resin system, the tensile strength increased from the original 98.2MPa to 115.6MPa, increased by 17.7%; failure strain increased with the amount increased of dendrimer, when dosage is 10%, increased from the original 1.9% to 3.1%, increased by 63.2%. (2) the impact strength increased from 25.4 ± 2.7 to 32.0 ± 1.0, increased by 26.0%, and after adding the dendrimer, impact strength at low temperatures is not lower than room temperature, and appropriate dosage of hydroxyl terminated dendrimers does not lower Tg of condensate. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendrimer-based glyphosate has better performance.
Dendrimer-based novel formulations of glyphosate has better pesticide effect than commercially available glyphosate, the advantage is to improve the solubility, increase dispersion, protect active substances, increase adhesion and so on. Even under adverse conditions are valid, such as under rainfall conditions, efficacy is still improved by 150% -250%. Nufarm and Starpharma cooperated together to do R & D, produce dendrimer-based substrate to increase or decrease the flow of insecticide penetration-imidacloprid-underground insects, efficient dendrimer-based crop protection products have become the R & D focus of international pesticide manufacturers, and there are always new international patent applications generated. Weihai CY Dendrimer Technology Co. Ltd as the first company in Asia to R&D and produce dendrimers, we have provided many dendrimer products to Peking University, Tsinghua University and Chinese Academy of Sciences, etc. for scientific experiments, and now we have already realized the industrialization of dendrimers. Welcome to the manufacturers of pesticides and other agricultural products to use our dendrimers in efficient crops product development and production to improve performance. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Cosmetics with dendrimers have superior performances.
Compared with conventional cosmetics, hydroxyl functional groups terminated dendrimer (CYD-CR111/CYD-CR236/CYD-CR486/CYD-CV11 etc.) as a cosmetic film-forming agent, can make cosmetic easy to uniformly spread on the skin, softening the skin, increase the adhesion, prevent the makeup off the skin and play cleaning effect, so it is a good cosmetic additive. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

CT contrast agents based on dendrimer/gold nanoparticles have superior properties.
Now commercially available CT contrast agents are iodine based, faults as following (1) short circulation time in vivo (2) potential toxicity to kidney. Dendrimer （CYD-MD1384/CYD-MK4514/CYD-MD2524/CYD-MK5654 etc.）based CT contrast agents has following advantages (1) gold shows higher X-ray attenuation coefficient, is more conductive to provide high quality CT effect.(2) Gold nanoparticles can be give targeting property and prolong circulation time due to its easy modified surface（3）gold nanoparticles prepared by dendrimer have good dispersion and biocompatibility property, and are also environment friendly.Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Excellent properties of organic light emitting device with dendrimer.
Advantages of OLED1)light weight (2) easy operation with simple elements (3) good imagine quality, high color purity and dynamic image(4) low power consumption. The most important fault of OLED is the short life span, but life span increased by 100% if use dendrimer (CYD-MD1384/CYD-MK4514/CYD-MD2524/CYD-MK5654 etc.) in the production, driven voltage is 1V less than the compared samples and lighting efficiency increased by 46%. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Starlike dendritic polymers modified acrylate resin coatings have good performances.
Water-based acrylate resin coatings use water as medium, it’s an environment friendly coatings as VOC is little. The disadvantage is the high surface tension of water, it results in poor leveling property, slow drying, sagging, craterring,low gloss etc. Because of bad water resistance,
it hasn’t been used in automatic coatings. Dendrimers (CYD-CR111/CYD-CR236/CYD-CR486/CYD-CV11etc.) can offer more active crosslinking point to lower viscosity of coatings and increase leveling property and crosslinking density, thus getting curing film with better over-all properties.Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

UV curable film performance of branched polyurethane acrylate
Dendrimers (CYD-CR111/CYD-CR236/CYD-CR486/CYD-CV11 etc.)have low viscosity and good adhesion, used in light curable acrylic polyurethane coatings formulations, their performance is complementary , thereby making coating performance more excellent. System with dendrimer has high functionality, cured film network has large crosslinking density and the film has high hardness, compared to unmodified polyurethane system, it has better coordination of the hardness and flexibility, therefore have better wear resistance, hardness increased 0.8 times, wear resistance increases 1.7 times. In addition, the dendrimer modified acrylic polyurethane UV coating, can be blended with a variety of active monomer to improve overall performance, while not affect its own flexibility and adhesion. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Excellent performances of dendrimers for the controlled release fertilizers.
The main problem of controlled release fertilizer on the market is that the brittleness increased after sulfur solidification, causing sulfur coated controlled release fertilizer seriously unshell. In existing production processes, coat the outer membrane of sulfur with thermosetting resin, microcrystalline wax or epoxy eased the problem, but there are still shelling phenomenon, affecting the release fertilizer effect. Dendritic polymer (CYD-CR236/CYD-CR486/CYD-CV236/CYD-CV486) used as toughening agent has very distinct advantages: 1) the effect is obvious, the impact strength and tensile

Dendrimers have superior performances as a new class of toughener.
Using a certain dosage of dendrimers(CYD-CD215/CYD-CR111/CYD-CV111) to modify epoxy resin, while improving the toughness, the strength remained unchanged.When dendrimer dosage is 16%, bending performance reaches maximum, bending strength improved from 55. 37 MPa to 60. 32MPa, bending modulus improved from 3544. 89 MPa to 3758. 32MPa, meanwhile impact strength reaches maximum, from 3. 10 kJ /m2 to 4. 64 kJ /m2, improved almost 50%. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendrimers have superior performances as a new class of toughener.
Using a certain dosage of dendrimers(CYD-CD215/CYD-CR111/CYD-CV111) to modify epoxy resin, while improving the toughness, the strength remained unchanged.When dendrimer dosage is 16%, bending performance reaches maximum, bending strength improved from 55. 37 MPa to 60. 32MPa, bending modulus improved from 3544. 89 MPa to 3758. 32MPa, meanwhile impact strength reaches maximum, from 3. 10 kJ /m2 to 4. 64 kJ /m2, improved almost 50%. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Double-curable dendrimers have excellent coating performance.
Using glycidyl methacrylate (GMA) andγ-aminopropyl triethoxy silane to modify dendrimer(CYD-CD333), thereby the external form alternating structure with dual curing capabilities, i.e. the moisture curing and UV curing. Advantages of coating application: 1)good hardness; 2) improve the adhesion; 3) flexibility and impact resistance increased; 4) fast curing speed; 5)better thermal stability and thermal degradation ; 6) greatly enhanced heat resistance.Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers.

Dendrimers can improve application performances of materials.
Dendrimers (CYD-CD215/CYD-CD151) can be immobilized onto gold, silica, quartz and other polymeric materials by physical or chemical method to improve application performance of materials that is applied to optical materials, sensors, etc., such as being immobilized onto the PP substrate to improve the material resistant to air permeability, adhesion, fluoride etc., resistance to air permeability can be increased by 16.6 times, and has good adhesion performance, can withstand force by 20N /cm2 . Conversely,adding dendrimers to coatings or other materials to improve adhesion property on gold, silica, or other materials. Weihai CY Dendrimer Technology Co. Ltd.-Professional Manufacturer for low cost dendritic polymers

PAMAM as gene carrier to enhance transfer efficiency.
PAMAM with DNA can form stable compound, the complex entered by cellular endocytosis into the cell, DNA fight against lysosomal degradation, PAMAM internal multistage amine has good buffer capacity to protect the DNA, and released DNA under the acid conditions to achieve the purpose of transfer. Amidization is easy, by controlling the amount of octadecadienoic acid chloride, grafting it with dendrimer to form the external hydrophobic and internal hydrophilic dendrimer, it can well combinate with DNA in gene transfer process, thereby improving the efficiency of gene transfer. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Preparation and Transfer Efficiency of Modified PAMAM Dendrimer Gene Delivery" Liu Junan, Wei Xiaolei, Jiang Hong, Zhong Wenzhong, College of Science,Huazhong Agricultural University, Wuhan 430070,China;Hubei Nanxing Chemical General Facory,Zhijiang 43200,China.

4. Applicatioin of dendrimer-based multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield.
Currently used chemical depressurizing and stimulation methods including: conventional acidifying, retarder acidifying, surfactant injection, shrink swelling agent injection, thermochemical technologies injection system. Dendrimer-based multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield can effectively solve disadvantages of traditional agent in application of ultra-low permeability oilfield. (1) acid-rock reaction speed is too fast, the penetration distance is short, resulting in ineffective acidification and short period of measures .(2)Surfactant adsorption capacity is big in the near-well place, thus does not reach far wellbore, reducing the effect of the active agent. (3) The injected chemicals is not compatible with the formation fluid and produced new precipitate, resulting in decreased permeability. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Multi-block complex depressurizing and stimulation agent for ultra-low permeability oilfield'', application number: 201210200334.4 Application (patent) by: Yangtze University address: 434020 Hubei Jingzhou South Loop on the 1st applicant: China PetroChina Changqing Oilfield Company ultra-low permeability reservoir research center inventor: Luo Yue, Chang Yanrong, Yang Huan, Shao Dong bo, Zhang Jianguo etal.

Dendrimers in the field of crude oil demulsification and viscosity has excellent application. Using divergent to synthesize polyamide-amine dendrimer with ethylenediamine core, especially assessed demulsification performance of PAMAM for the O/W type simulated oil emulsion, and also performance on heavy oil viscosity reduction. The results showed that whole generation PAMAM have good demulsification effect, where 3.0-generation PAMAM at 45 ℃, dosage of 100mg / L, breaking time 60min, the demulsification rate was 80%. Half-generation PAMAM had certain viscosity reducing effect, at 70 ℃, dosage of 0.6%, viscosity reduction time 60min, the viscosity reduction rate was 28.2%. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from "Demulsification and visbreaking of dendrimers on crude oil" Li Cuiqin, Wang Jun, Yang Hongjun, Yang Peifa, Daqing Petroleum Institute, Daqing, Heilongjiang College of Chemistry and Chemical Engineering

Good mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure.
Hyperbranched polyesters can be widely used in coatings, either as direct additives, curing agent or as coating substrate, have shown superior performance compared with conventional additives . Introduction of about 1% of hydroxyl-terminated hyperbranched polyester , PU physical and mechanical properties improved significantly. The tensile strength of polyester PU increased 18.2 times compared to PU without hyperbranched polyester; hyperbranched polyester with modified double bonds in the UV-curable coatings has outstanding performance. Such as coatings of flexible material, it shows excellent resistance to oxygen permeability, making oxygen permeability of the PET and PP increased by 2.3 times and 15 times, in addition, adhesion is good on the PET and PP packaging substrate , has broad application prospects. Professional Manufacturer for low cost dendritic polymers.-Weihai CY Dendrimer Technology Co. Ltd. forwards from “Preparation and mechan ical properties of aliphatic polyurethane elastomers with hyperbranched structure” Zhang Jie, Hu Chunpu* ( School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China)