Cotton fabric is loved by everyone because of its good application characteristics such as soft touch, comfortable wear, moisture absorption and air permeability, but it also has defects such as poor elasticity and wrinkling after washing.In order to improve the shape retention of cotton fabric and to make it easy to maintain, it is usually treated with a hands-off finish.Etherified 2D resin finishing agent with low formaldehyde emission is the most widely used in the current domestic easy - to - iron finishing.Although this kind of finishing agent reduces the amount of formaldehyde released, the strength of the finished fabric is seriously damaged. In recent years, we have also developed polycarboxylic acid acetals and other new no-hot finishing agents, but the cost is high and the actual effect of no-hot is poor. It is difficult to obtain good comprehensive properties of cotton fabric with only one finishing solution, but reasonable combination of finishing solution can give cotton fabric various functions.Polyurethane (PU) is a copolymer with alternating hard and soft chains. Its chemical structure can be controlled and it is widely used in adhesives, coatings, printing, textiles and medicine.Waterborne polyurethane (WPU) uses water instead of organic solvent as its medium, which has attracted widespread attention because of its environmental protection characteristics.Different waterborne polyurethanes and etherized 2D resins were selected to be used as the hands-off finishing of cotton fabric, in order to increase the actual effect of hands-off finishing of fabric and reduce the strength damage, and according to the optimal ratio of different components, the formula of hands-off finishing liquid with the best shape preserving characteristics was obtained. Test results show (1)The strength retention rate of the cotton fabric after the compound finishing of etherized 2D resin and 8 different water-based polyurethane was improved to different degrees. When the mass concentration of water-based polyurethane was 60g/L, the strength retention rate was as high as 69.52%. (2)Strong protective agent can improve the strength retention rate of the cotton fabric after the ironing finishing, but excessive strong protective agent will reduce the wrinkling recovery of the cotton fabric According to various performance indexes of cotton fabric, when the mass concentration of etherized 2D resin is 100g/L, the mass concentration of water-based polyurethane is 40g/L, and the strong protective agent is 35g/L, the actual effect of free ironing is the best, the crease recovery Angle is up to 271.50, and the strength retention rate is 65.1 Our company produces polyurethane emulsion for textile, and all kinds of film glue, textile and so on, welcome to consult to buy, please click here

Compared with acrylic resin, water based polyurethane is a new and more environmentally friendly adhesive, because acrylic resin mostly contains hydroxymethyl acrylamide, which will produce formaldehyde during the use of water loss and crosslinking, causing air pollution and endangering human health.Waterborne polyurethane has the advantages of high bonding strength, good flexibility, good frost resistance, excellent wear resistance, good solvent resistance and so on. When it is used in fabric printing, it can give the printing pattern excellent frost resistance, wear resistance, softness, resilience, dry and so on.Because most water based polyurethane emulsion is obtained by self-emulsification method, a certain amount of hydrophilic groups are usually introduced, which will lead to reduced water resistance of waterborne polyurethane film; In addition, waterborne polyurethane is used as coating printing adhesive, the price is high, water fastness and wet rubbing fastness to be improved in order to overcome this defect, many scholars have carried out research on waterborne polyurethane for coating printing. Some homemade waterborne polyurethane printing crosslinker, at the same time synthesized better water resistance mixed polyurethane adhesive used in coating printing and anti-wrinkle anti-pilling finishing effect is better.The application process of waterborne polyurethane adhesive in coating printing was studied, including the influence of adhesive dosage, crosslinker dosage, optimum baking temperature and time on fabric printing performance.The water-based polyurethane for coating printing was self-synthesized. The indexes of rubbing fastness, hand soap fastness and so on were investigated. The indexes met the national standards (wet rubbing fastness above 2, dry rubbing fastness 2-3).The water-based polyurethane with excellent performance was synthesized by molecular design, and the influence of R value and DMPA percentage of polyester synthesis process on the performance of coating printing adhesive was investigated. The water-based polyurethane was modified by silicone/epoxy composite, and the coating printing glue with good comprehensive performance was prepared. At present, waterborne polyurethane adhesive used in coating printing generally needs to add curing agent to achieve the ideal washable performance, and too much curing agent will affect the softness of printing feel. Our company produces textile inks, adhesives, polyurethane coatings, welcome to consult

With the development of The Times, people's invention is more and more magical, super hydrophobic coating is one of them, the use of the product can make the surface of the pollutants or dust can be gravity, rain or wind and other external forces automatically removed or degraded.What factors will affect the coating hydrophobicity, let us know about it. 1 hydrophobic principle The wettability of water on a solid surface is related to the state of the solid surface.For different permeability models, the roughness of solid surface is different. Water is usually affected by Young s equation on an ideal smooth plane.When the solid surface has a certain roughness, the equation is not applicable to the wettability model of rough surface mainly including Wenzel model.The model has an important assumption: it is assumed that liquid can always fill grooves on rough surfaces, which does not seep liquid into the rough mechanism.In this case, the Cassie-Baxter model is mainly used, which assumes that the droplet base on the rough surface is compound contact, and the apparent liquid-solid interface is actually composed of solid and gas. 2 Factors affecting the hydrophobicity of coating The hydrophobicity of the coating is mainly determined by the chemical composition of the coating and the physical structure of the surface. The chemical composition mainly affects the hydrophobicity of the coating as a chemical group with low surface energy. At present, the widely used hydrophobic coating has fluorine coating, silicon coating and paraffin fluorine coating. The surface energy of fluorine group in fluorine coating decreases with the substitution of fluorine atom number, so fluorine atom number increases the hydrophobic function of the coating.The silicon-containing coating mainly forms special structures on the surface of the coating by sol-gel method, and silane monomers with a certain length of carbon chain can also be introduced to increase hydrophobicity. Paraffin is a mixture of straight-chain alkanes with 16-30 carbon atoms, which has low surface energy and water will not penetrate into its surface. When the organic coating contains larger hydrocarbon groups, it also has lower surface energy and a certain degree of hydrophobicity.The physical structure of the surface has a great influence on it.The hydrophobic coating on the surface of biological surface is mainly constructed by a special knot.Structurally, nanoparticles are constructed on the surface of particles to obtain micro/nano structure and achieve hydrophobicity. Our company produces all kinds of nano coating, used for car body, car windshield, building wall, textile fabric.Welcome to consult

Solvent selection In the printing ink manufacturing process, considering the overall solvent system of the volatile ladder, improve the printing ink solvent release and reduce printing solvent organic solvent residue, the solvent used is often a mixture of several volatile solvents. In the printing ink manufacturing process, the main organic solvents are toluene butyl ketone cyclohexanone ethyl acetate butyl acetate n-propyl acetate isopropyl alcohol, customers can adjust the volatility of the ink according to seasonal changes. Pigment selection Due to the large difference in the grade of pigments on the market, the performance of dispersive ink stability and other aspects of the same pigment from different manufacturers of the same resin in polyurethane inks often varies greatly, so it is suggested that users choose pigments carefully according to their actual customer needs Selection of auxiliaries Wax powder: the wax powder used in the production of polyurethane ink is often low molecular weight polyethylene wax, the relative molecular weight is generally 1000~6000, has good solubility in the organic solvent of ink, and has good affinity with the polyurethane resin itself, and has good chemical stability Mainly play to increase the friction resistance of the ink film surface, at the same time can appropriately alleviate the anti-viscosity of the ink itself Dispersing agent:A class of surfactants, mainly used for wetting the surface of pigments to shorten the ink manufacturing time, is conducive to the dispersion of pigments, sometimes can appropriately reduce the amount of oil absorption of pigments.In the manufacture of high concentration ink, can reduce the yield value of ink, prevent ink pigment particles agglutination and precipitation has a certain effect. Adhesion promoter: printing inks containing a large number of polar groups, such as BOPP PE 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. We are a manufacturer of acrylic resin for water base inks,welcome customers to inquire.