Water-soluble polyurethane is widely used in the textile, leather, adhesive printing and dyeing industries. Of course, if used in fabric finishing, it can enhance the splendor and solemnity of clothes or accessories. Wearing comfort is appreciated by most consumers.
(l) Fabric coating agent
Fabric coating refers to coating a fabric (base fabric is usually medium fiber fabric, canvas, nylon silk, polyester, etc.) on the surface After forming of a high-adhesion high-layer polymer film, it can be post-processed to obtain functional coated fabrics with different requirements. Water-soluble polyurethane is non-toxic and non-polluting and is recommended as a high-performance textile coating agent. It has good development prospects and is widely used in nylon, silk, cotton canvas, polyester cotton and other fabrics. The coated fabric has the functions of waterproof and vopermeable, soft surface, high elasticity and enhanced anti-pilling.Waterproof and moisture-permeable polyurethane films and coatings have become the focus of research by researchers at home and abroad, because they are both waterproof and breathable. Waterproof and breathable (also known as waterproof and breathable) refers to polymer materials that do not allow liquids such as water droplets to pass through, but still allow the free passage of water vapor. With the gradual improvement of people\'s living standards, the demand for waterproof and breathable clothing, shoes and hats and other fabrics has grown rapidly. Researchers from various countries have also accelerated the research of new \"breathable\" polymer films and coating products. Although microporous films and coatings have the advantages of high moisture permeability, they have disadvantages such as poor resilience, low mechanical stability, poor abrasion resistance, complex processing technology and high production cost.stone. material, which can be used as a fabric for high-quality clothing and sports shoes by laminating and compounding with open-pored fibers. Of course, water-soluble polyurethane coating agents also have some disadvantages, such as high latent heat of vaporization of water, slow drying and consumption of drying energy. But these can be solved by increasing the solids content of water-soluble polyurethane. Another example is the high surface tension of water. The wettability of the substrate is poor, which can be solved by adding a small amount of high boiling organic solvent.
(2) Anti-shrinkage finishing agent for wool fabric
Resin finishing is currently a widely used wool anti-shrinkage processing method abroad. Compared with the oxidation method, it basically does not damage wool, and the treatment is relatively uniform, easy to operate and control. There will be manyresins used for shrink-free finishing of wool, such as polyurethane, polyamide epichlorohydrin condensate, polyacrylic acid ester, polysiloxane, etc. However, only the first two are used more. Finishing with polyamide-epichlorohydrin condensate requires a mild chlorination pre-treatment process for wool fibers, which is cumbersome and difficult to control. Because it is usually used in the continuous anti-shrinkage treatment of wool tops, the polyurethane anti-shrinkage agent can be finished in one step, saving the chlorination process and making the operation convenient and pollution-free. The molecular chain of the anti-shrink agent contains active groups. After finishing, a polymer film with a cross-linked network structure is formed on the surface of the wool fiber, and a chemical bond is formed between the wool fiber. Durability is pretty Good. Therefore, the water-soluble polyurethane wool anti-shrink agent is recommended by the International Wool Bureau (Iws), and now many domestic wool spinning mills use Bayer\'s Synt These products haPPretBAP and ElastronBAP woolen anti-shrinkage agent from Dayiqi Company in Japan belong to the category of water-soluble polyurethane.
(3) Anti-Static Finishing Agent
Most chemical fiber fabrics generate negative charges after friction, so anti-static agents should be used for finishing. Antistatic agent is an important class of auxiliary substances for finishing fabrics. Cationic surfactants are effective antistatic agents for synthetic fibers. However, such antistatic agents used in industry have the disadvantages of insufficient washing fastness, easy discoloration of dyed fabrics and low rub resistance. The water-soluble polyurethane, especially the ionic water-soluble polyurethane, is a good fabric finishing agent, which not only has good anti-static effect, but also has good adhesion tohas fabrics and is resistant to washing.
(4) Anti-pilling finishing agent
Pure cotton knitted fabrics are processed by boiling, bleaching, dyeing, finishing, etc., resulting in a lot of lint and static electricity. After wearing for a while, the surface of the fabric will pill, affecting aesthetics and comfort. Resin finishing of fabrics can improve the anti-pilling performance of fabrics and can improve the anti-wrinkle and anti-static properties of fabrics.
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