Sinograce Chemical's waterborne polyurethane is mostly used in the following scenes.While providing quality products, Sinograce Chemical is dedicated to providing personalized solutions for customers according to their needs and actual situations.
Company Advantages 1. The whole installation process for our coupling agent in composites needs no any technical tips. 2. The product features innocuity and harmless. Its raw materials are non-toxic and lead-free silicate minerals which are sourced from nature. 3. It allows the shoe to breathe, avoiding producing a proliferation of bacteria and fungi and bad odor. By choosing this material the wearer will get rid of smelly feet.
Company Features 1. Anhui Sinograce Chemical Co., Ltd. primarily focuses on designing, developing and manufacturing coupling agent in composites . 2. We possess a strong team of talents in technical support. They are equipped with a wealth of product knowledge and analytical skills, allowing us to solve customers' technical problems promptly. 3. We are committed to encouraging more sustainable practices for both our customers and our suppliers, and to drive sustainability through the supply chain. We regularly ask our stakeholders for comment and feedback on our sustainability program. We work towards our targets over the year and monitor our progress quarterly to make sure that we are meeting them. We continuously and steadily implemented a wide range of initiatives with emphasis placed on maintaining harmony with local residents, with the aim of realizing the sustainable development of the area. Please contact.
1.Introduction to silicone acrylic emulsionSilicon-acrylic emulsion is a kind of composite emulsion. It is a copolymer emulsion of organosilicone and acrylate.Acrylic resin has many excellent characteristics, such as weather resistance and light resistance, long time under ultraviolet irradiation is not easy to yellow. In addition, it also has flexibility, so it is often used as a leather finishing agent. However, as acrylic resin belongs to thermoplastic materials, it is a linear molecular structure, lack of crosslink points, not easy to form a network structure, sensitive to temperature changes, high temperature return viscosity, low temperature lack of elastic, that is, easy to appear hot viscosity cold brittle phenomenon.The main chain of organosilicon resin is si-o bond, and its bond energy is 450k J/mol, which is much higher than the bond energy of 345kJ/mol of c-c bond and bond energy of 351kJ/mol of c-o bond. Therefore, organosilicon resin has good resistance to high temperature, infrared radiation and ultraviolet light, chemical resistance；In addition, the surface energy of organosilicon resin and low vitrification temperature are low.With good hydrophobic wear resistance and anti - pollution.In summary, the modification of acrylic resin with an appropriate amount of silicone resin can not only make up for the defects of acrylate, but also improve its mechanical properties.2.Modification method of silicon - acrylic emulsionSilicone acrylic emulsion modified method there are two ways: the physical method is to a certain amount of siloxane and acrylate mechanical mixing, this method is simple, but due to both the surface and the difference of molecular structure, poor compatibility with polysiloxane acrylate, because the former is migration, caused by composite emulsion stability is poor, prone to phase separation phenomenon, the result is not ideal.Chemical method is the use of emulsion polymerization, in addition to the siloxane and acrylate have a simple physical cross-linking, but also the existence of chemical bonds, so that the two components of the polarity of the material with a large difference in the combination, in the micro to achieve uniform dispersion, improve the stability of the emulsion.The silicon-propylene composite emulsion was prepared by chemical method, and then the silicon-propylene composite emulsion was used to replace the water-borne polyurethane emulsion.The modified waterborne polyurethane emulsion has the advantages of three, and the water resistance is improved.According to the preparation method of si-acrylic emulsion, si-acrylic emulsion was prepared by seed emulsion polymerization with methyl methacrylate acrylic vinyl silicone oil as raw material.Then the prepared silicon-acrylic emulsion was modified to the prepared waterborne polyurethane, the composite emulsion was configured by blending method, the film was formed on different substrates, and the mechanical properties of the film such as adhesion contact Angle water absorption were tested,The film surface of the modified si-acrylic emulsion /WPU composite was observed by scanning electron microscope.The structure was analyzed by ir spectra.The experimental results show that the water absorption rate is the lowest when the content of si-propylene emulsion is 2%, which is 18.19%.The adhesion reaches a level when the content is 4% and 5%.Viscosity is also lower than before modification.
In February 2020, during the severe situation of covid-19, Sinograce Chemical company dared to assume social responsibilities and made a modest contribution to the fight against covid-19. It donated alcohol and 84 disinfectant and other epidemic prevention materials to hefei primary and secondary schools and universities for daily disinfection of schools, with a total of 10 tons of 84 disinfectant and 5,000 liters of alcohol.In the hope of an early end to COVID-19 epidemic, received the school's praise and thanks!
At present, two-component waterborne polyurethane has been widely used in leather, textile dyeing AIDS, adhesives, foam materials, coatings and other fields. With the continuous development of two-component waterborne polyurethane scientific research, it is gradually replacing solvent polyurethane as the medium to occupy the dominant position in the market.One: leatherChina's leather resources, production and export trade are among the world's leading.China's annual consumption of polyurethane synthetic leather paste is nearly 2.4 million tons. The solvent polyurethane used in the synthetic leather industry has caused serious environmental pollution, and the production process of water-based synthetic leather cleaning emerged as The Times require.At present in the leather industry, waterborne polyurethane is mainly used for leather finishing, leather filling, leather adhesive and so on.In synthetic leather, the dispersed two-component waterborne polyurethane can be used as adhesive for artificial leather and surface treatment agent for artificial leather, as well as for synthetic leather bass, surface layer resin, bass veneer and special base coating resin.Two :Textile dyeing auxiliariesIn the field of textile industry, two-component waterborne polyurethane can be used as dyeing AIDS, printing, finishing agents, etc., showing good application properties, such as flame retardant, breathable, wrinkle resistance, etc.Fabric finishing agent is a layer of coating on the surface of the fabric, on the one hand, the surface gives the fabric some functions, such as waterproof, fire, etc.On the other hand, different fabric finishing agents give fabrics different appearance styles.Traditional solvent - based two - component polyurethane system contains a large number of organic solvents, causing great harm to human body.The two-component waterborne polyurethane system is free from harmful solvents such as formic acid, which may be the development direction of textile dyeing auxilaries in the future.Three : AdhesiveNational standard GB/ t30779-2014 waterborne polyurethane adhesive for shoes was officially implemented.This standard has filled the gap in the field of waterborne polyurethane adhesive for shoes in China, further standardizing the market order of waterborne polyurethane adhesive for shoes, and has a good promoting effect on environmental protection and energy saving in the production of shoes.Two-component waterborne polyurethane adhesive is widely used in the fields of soles and uppers, leather, home building materials, automotive interior and so on, but there are serious safety, health and environmental protection problems in the production and application of solvent adhesive.With the promotion of national policies and the continuous enhancement of enterprise customers' concepts of safety, green and environmental protection, it has become a trend to vigorously research and develop environmentally friendly adhesives with high technical content, high added value and high performance.The two-component waterborne polyurethane adhesive has the characteristics of high adhesion strength and wide application range.The bonding technology between the soft and hard substrates has high requirements on the bonding strength, heat resistance, weather resistance, water resistance, chemical resistance and other comprehensive properties of the adhesive.Two - component waterborne polyurethane has been widely used to meet the requirements of adhesive property.Four: foam materialTwo - component waterborne polyurethane also has important applications in foam industry.WPU foam can be used to repair the cement cement road.WPU foam material can be foamed and solidified quickly, and it has high compressive strength, realizing quick repair of road surface and saving cost.In order to increase the bonding force between WPU foam material and the substrate, the epoxy resin was used to modify WPU foam material, and the dihexanolamine was used to react with the epoxy resin to open the ring, which improved the interfacial bonding force of the foam material.Five:the coatingTwo-component waterborne polyurethane coatings with good performance and low VOC content have broad application prospects.The coating with smooth surface, high gloss and good performance can be obtained by combining polyol component with aliphatic polyisocyanate curing agent.In the future, it will replace solvent - based two - component polyurethane to become the leader of coating industry.A two-component waterborne polyurethane coating with high gloss, high drying rate, good weather resistance and low cost was prepared by using acrylic polyol dispersion as film forming agent, waterborne HDI trimer as curing agent, iron white powder as pigment, and suitable additives.In addition to the above applications, two-component waterborne polyurethane can also be used in antibacterial materials, hydrogels, etc.Through multifunctional modified polyurethane can also be applied in antibacterial material, using the epoxy propyl alcohol isocyanate polyurethane pre polymers to end sealing side, the waterborne polyurethane molecular chain containing epoxy groups, by Fielding diamine crosslinking agent with an antibacterial compound with epoxy quaternary ammonium compounds, the preparation of compound can be used for wound dressing, can effectively absorb wound exudate.Dopamine-modified waterborne polyurethane was combined with FE 3O4 nanoparticles to prepare nanocomposites, which were applied to biomimetic hydrogels.
The choice of solventIn the printing ink manufacturing process, in consideration of the overall solvent system of the ink volatility, to improve the printing ink solvent release and reduce the solvent organic solvent residue, the use of solvents are often several volatile mixed solvents.In the printing ink manufacturing process, the main organic solvents are toluene, butanone, cyclohexanone, ethyl acetate, butyl acetate, n-propyl acetate, isopropanol, etc., customers can adjust the volatility of the ink according to seasonal changes.The choice of pigmentAs a result of the market pigment grade difference, in polyurethane ink for the same resin manufacturers of the same pigment dispersion, ink stability and other aspects of the performance is often a big difference, so it is recommended that users according to their actual customer needs carefully choose pigment.The selection of additivesWax powder: in the production of polyurethane ink, the use of wax powder is often low molecular weight polyethylene wax, the relative molecular weight is generally 1000 ~ 6000, the organic solvent in the ink has a good solubility, and polyurethane resin affinity is good, at the same time has a good chemical stability.Mainly to increase the friction of the surface of the ink film, at the same time to properly alleviate the anti-viscosity of the ink itself.Dispersant: a class of surfactant, mainly used for wetting pigment surface, shorten ink manufacturing time, is conducive to the dispersion of pigment, and sometimes appropriate to reduce the oil absorption of pigment.In the production of high concentration of ink, ink yield can be reduced to prevent the ink pigment particles agglutination and precipitation has a certain effect.Polyurethane resin adhesion promoter: printing inks containing a large number of polar groups, BOPP, PE and so on nonpolar substrate surface even by corona surface treatment, surface tension in 38 dyne ~ 42 dyne, to improve the polyurethane ink on the substrate surface adhesion fastness, often need to add the appropriate ester titanate coupling agent or chlorinated polypropylene adhesion promoter.