Organic silicon-modified polyurethane resin for synthetic leather and preparation method thereof
A polyurethane resin and silicone technology, applied in fiber processing, textiles and papermaking, etc., can solve the problems of poor compatibility, whitening of the resin film, affecting the appearance of products, etc., and achieve the effect of improving compatibility and water resistance.
Active Publication Date: 2012-07-25
ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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Problems solved by technology
The way of adding is generally to add silicone additives to polyurethane resin through physical mixing. Due to the poor compatibility between silicone and polyurethane resin, the addition of simple physical mixing will lead to the precipitation of silicone. It will cause oil on the sur
Method used
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example 1
[0025] Heat 139.5 parts of polycarbonate diol (molecular weight 2000) to 100°C, vacuum dehydrate for about 1 hour, cool down to 50°C, add 400 parts of DMF, 30 parts of polyether-polysiloxane, 7.9 parts of 1 , 4-butanediol, 6.3 parts of ethylene glycol, stir evenly; add 21.2 parts of TDI, 35 parts of MDI, 0.5 parts of dibutyltin dilaurate and stir evenly, heat up to 75°C, react for 3.5h; add 250 1 part of TOL, keep the temperature at 75°C, use 9.6 parts of MDI to increase viscosity, feed once every 45 minutes, and feed 0.5-3 parts each time; after the viscosity reaches the predetermined value, cool down to 60°C, add 100 parts of methyl ethyl ketone and stir evenly , continue cooling to 30°C, and discharge. The solid content is 25%, the viscosity is 20000cps / 25℃, and the 100% modulus is 80kgf / cm 2 Silicone modified polyurethane resin.
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Abstract
The invention designs organic silicon-modified polyurethane resin for synthetic leather and a preparation method thereof, which relates to the field of processing of the synthetic leather and aims at solving the technical problems of poor anti-sticking property, water resistance, wear resistance and other properties of the existing synthetic leather. The organic silicon-modified polyurethane resin disclosed by the invention is characterized by comprising the following raw material ingredients in percentage by weight: 2%-30% of diisocyanate, 5%-40% of polyester or polyether type polylol, 0.5%-20% of hydroxyl-terminated organic silicon, 0%-10% of small molecular polylol chain extender, 0%-13% of small molecular polyamine chain extender, 0.01%-1% of catalyst and the balance of solvent, wherein the hydroxyl-terminated organic silicon adopts a polyether-polysiloxane copolymer with two ends which are of hydroxyl groups, and a polyether chain segment is of polyoxyethylene or polyoxypropylene. The glossiness and transparency of the polyurethane resin after modification can not be affected by the organic silicon, and the anti-sticking property, surface smoothness, wear resistance and waterresistance are obviously improved simultaneously.
Description
technical field [0001] The invention relates to the field of synthetic leather processing, in particular to an organosilicon-modified polyurethane resin for synthetic leather and a preparation method thereof. Background technique [0002] When polyurethane resin is applied to the dry surface layer or surface finishing agent of synthetic leather, silicone additives are usually added to improve the hand feel of the product, and improve the anti-sticking, water resistance and wear resistance of the product. The way of adding is generally to add silicone additives to polyurethane resin through physical mixing. Due to the poor compatibility between silicone and polyurethane resin, the addition of simple physical mixing will lead to the precipitation of silicone. It will cause oil on the surface of the product. In addition, the poor compatibility of polyurethane resin and silicone resin will also cause side effects such as whitening of the resin film and decrease in gloss, which w...
Claims
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Login to view more IPC IPC(8): C08G18/61C08G18/48C08G18/42C08G18/32C08G18/12D06M15/653
Inventor 陈华郦向宇戴文琪
Owner ZHEJIANG SUNLIGHT MATERIAL TECH CO LTD
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