Polyurethane is the short form of polyurethane (PU). It is a block polymer formed by addition polymerization. It is a polymer compound with flexible and elastic polyether or polyester as soft segment and rigid and hard carbamate as hard segment. It contains a considerable number of ammonia ester bonds. Waterborne polyurethane has been successfully applied in the textile printing and dyeing industry, it can give fabrics excellent softness, fullness, wash resistance, wear resistance, good resilience, smooth, good feel, antistatic, etc. Waterborne polyurethane in textiles mainly plays the following roles.

Waterproof and permeable coating agent

Waterborne polyurethane film forming property is good, the fabric after coating finish can form a durable film, has better water resistance, water droplets are not easy to penetrate, because the molecular structure of waterborne polyurethane contains more polar groups, water vapor can be diffused to the surface through the polyurethane amorphous area, so that the coated fabric has waterproof and moisture permeability function, can be used to manufacture clothing, raincoat, tent and other textiles. At the same time, it can be crosslinked with functional groups such as hydroxyl to improve the washing resistance. After forming a film, the fabric is more tightly organized and the gap is closed. After making a down jacket, pillowcase and quilt, the feathers are not easy to Pierce out.

Wash and wear finisher

In the traditional process, most of the anti-wrinkle finishing agents used are formaldehyde finishing agents. This finishing agent is harmful to the ecological environment and human body, and there are serious problems of fabric damage. Low molecular weight carbamate - based block copolymerization of elastic polymers can meet people's needs. This resin does not contain formaldehyde, has good film forming property and elasticity, is expected to give the fabric a certain wrinkle resistance, and improve the strength of the fabric, can greatly improve the wrinkle recovery Angle of finishing, wear resistance, and give the fabric excellent feel, it is effective on cotton, polyester cotton, polyester viscose and other fibers.

Anti-shrinkage finishing agent for wool

There are many resins used for wool shrinkage finishing, such as polyurethane, polyamide surface chlorol condensation, polyacrylate, polysiloxane and so on. Polyurethane anti-shrinkage agent finishing can be in place in one step, no pollution, anti-shrinkage agent molecular chain contains active groups, after finishing the surface of the wool fiber formed with a cross-linked network structure of polymer film, and the wool fiber between the chemical bond connection, so it has excellent anti-shrinkage effect, and anti-shrinkage durability is quite good.

Anti-pilling agent

Resin finishing is an effective way to improve the resistance of fabric to fuzz and pilling. The principle is that the fiber surface is coated with a layer of wear-resistant resin film, and the slip between fibers is weakened by using the function of the resin on the fiber surface. At the same time, the resin is uniformly crosslinked and condensed on the surface of the yarn, so that the fiber end adheres to the yarn and is not easy to pilling when rubbed. Resin finishing can improve the anti-fuzz and pilling properties of fabric and improve the anti-wrinkle and anti-static properties of fabric.

Dye-fixing agent

The dry and wet rubbing fastness of fabrics dyed with anionic dyes such as reactive dyes and direct dyes has been troubling printing and dyeing enterprises and clothing industry. Water-based polyurethane modified as a color fixer can be processed at low temperature, has good air permeability, and can significantly improve the friction resistance of fabrics.

At present, waterborne polyurethane has been widely used in the textile industry as a textile additive with environmental protection, high performance, aldehyde-free and other excellent properties. Among them, it is mostly used as a waterproof and breathable coating agent. However, as an antistatic agent and color fixing agent, there are few researches on its theoretical mechanism or practical application. In the future, due to the continuous improvement of the performance of waterborne polyurethane in coating agent, wool shrinkproof finishing agent, anti-pilling agent, increase the research of waterborne polyurethane ironing agent, antistatic agent, color fixing agent and other new uses, to provide the best finishing scheme for the textile industry.

Sinograce, 15 years focused on the production of water based polyurethane series products, non-toxic environmental protection, with the most professional attitude, for you to solve all problems in practical application. If you are interested in or have questions about our waterborne polyurethane products, we welcome you to contact us free at +86 0551 63459511.