阅读说明：本技术 涂层组合物和其用途 (Coating composition and use thereof ) 是由 陈玉胜 石丽丽 张志海 王锐 郭谊 宋文刚 王林飞 于 2020-04-09 设计创作，主要内容包括：提供了一种皮革涂层组合物、利用所述皮革涂层组合物作为顶涂层(5)的基于硅酮的合成皮革、制造所述合成皮革的方法以及所述合成皮革和所述皮革涂层组合物的用途。所述皮革涂层组合物包括含有以下的可氢化硅烷化固化的硅酮弹性体组合物：组分(i)一种或多种聚二有机硅氧烷聚合物,所述一种或多种聚二有机硅氧烷聚合物在25℃下的粘度为1000mPa.s到500,00mPa.s并且每个分子烯基和/或炔基含量占所述聚合物的至少5重量％；组分(ii)增强填料,如任选地用一种或多种已知填料处理剂处理的细碎二氧化硅；组分(iii)硅酮树脂交联剂,所述硅酮树脂交联剂具有包括硅酮键合的氢的端基；组分(iv)氢化硅烷化催化剂；组分(v)经固化的硅酮粉末；以及组分(vi)生态稀释剂。(A leather coating composition, a silicone-based synthetic leather using the leather coating composition as a top coat (5), a method of manufacturing the synthetic leather, and uses of the synthetic leather and the leather coating composition are provided. The leather coating composition includes a hydrosilylation-curable silicone elastomer composition comprising: component (i) one or more polydiorganosiloxane polymers having a viscosity at 25 ℃ of from 1000mpa.s to 500,00mpa.s and an alkenyl and/or alkynyl content per molecule of at least 5 wt% of the polymer; component (ii) a reinforcing filler such as finely divided silica optionally treated with one or more known filler treating agents; component (iii) a silicone resin crosslinker having end groups comprising silicone-bonded hydrogen; component (iv) a hydrosilylation catalyst; component (v) a cured silicone powder; and component (vi) an ecological diluent.)

1. A leather coating composition comprising a hydrosilylation-curable silicone elastomer composition comprising:

component (i) one or more polydiorganosiloxane polymers having a viscosity at 25 ℃ of from 1000 to 500,000mpa.s and an alkenyl and/or alkynyl content per molecule of at least 5 wt% of the polymer;

component (ii) a reinforcing filler such as finely divided silica optionally treated with one or more known filler treating agents;

component (iii) a silicone resin crosslinker having end groups comprising silicone-bonded hydrogen;

component (iv) a hydrosilylation catalyst;

component (v) a cured silicone powder; and

component (vi) an ecological diluent.

2. The leather coating composition of claim 1, wherein component (iii) of the hydrosilylation-curable silicone elastomer composition comprises one or more of:

including Si-H containing M groups, (CH)₃)₃SiO_1/2Radical and SiO_4/2A silicone resin consisting of or containing a group;

comprising Si-H containing M groups and SiO_4/2A silicone resin consisting of or containing a group; including Si-H containing M groups, (CH)₃)₂SiO_2/2Radical and SiO_4/2A silicone resin consisting of or containing a group;

comprising Si-H containing M groups, SiO_4/2Group and (C)₆H₅)₃SiO_1/2A silicone resin consisting of or containing a group; and alternatives wherein methyl is replaced by phenyl or other alkyl groups or mixtures thereof, and wherein each of the foregoing may contain one or more T groups.

3. A leather coating composition according to any preceding claim, wherein the average particle size of the cured silicone elastomer powder (v) is from 0.01 μ ι η to 100 μ ι η.

4. A leather coating composition according to any of the preceding claims, wherein eco-solvent (vi) comprises or consists of: isopentadecane, isohexadecane, isoheptadecane, isooctadecane, isononadecane, and mixtures thereof or trimethyl-terminated polydimethylsiloxanes having a viscosity of greater than or equal to 5mPa.s at 25 ℃ to equal to or less than (≦)100mPa.s at 25 ℃.

5. The leather coating composition according to claim 4, wherein the eco-solvent (vi) comprises or consists of isohexadecane.

6. A leather coating composition according to any preceding claim, wherein the composition may comprise one or more additives selected from the group consisting of: one or more low viscosity polydiorganosiloxane polymers having at least one, alternatively at least two, alkenyl and/or alkynyl groups per molecule and a viscosity at 25 ℃ of from 100 to 750 mpa.s; an inhibitor; a non-reinforcing filler; a conductive filler; a non-conductive filler; a shelf life extender; a flame retardant; a pigment; a colorant; a chain extender; a heat stabilizer; a compression set improving additive; a sound-reducing agent; antifreeze and/or biocide.

7. Leather coating composition according to any of the preceding claims, which is a top coating composition for silicone-based synthetic leather.

8. A silicone-based synthetic leather comprising a top coat which is the reaction product obtained when the composition according to claims 1 to 7 is cured.

9. The silicone-based synthetic leather of claim 8, comprising a textile support layer selected from one or more of the following: polyester fibers, viscose rayon fibers, polyamide fibers, nylon, acrylic fibers, polyolefin fibers; cellulosic fibers and elastic web materials.

10. The silicone-based synthetic leather of claim 8 or 9, wherein the top coat has a weskiber (Wyzenbeek) abrasion resistance greater than or equal to 75,000 according to ASTM D4157-13.

11. A method of applying silicone-based synthetic leather with the topcoat composition of any one of claims 1 to 6 by one or more of: including spraying, rolling, brushing, spin coating, dipping, solvent casting, slot coating, spraying, doctor blade coating, or gravure coating.

12. A method of applying silicone-based synthetic leather with the topcoat composition of any one of claims 1 to 5 by:

(i) applying a coating composition as described above to release paper;

(ii) curing a coating composition as described above on the release paper to form a cured topcoat;

(iii) applying a silicone skin over the cured topcoat;

(iv) curing the silicone skin layer to form a cured skin layer such that the cured topcoat layer is sandwiched between the release paper and the cured skin layer;

(v) applying a silicone adhesive composition to the cured skin layer;

(vi) placing a fabric support layer on top of an adhesive layer such that the adhesive layer is sandwiched between the skin layer and the fabric support layer; preferably, the fabric support layer is operatively laminated to the adhesive layer.

(vii) Curing the bonding layer; and

(viii) the release paper is removed as needed.

13. Use of a synthetic leather, in particular a silicone-based synthetic leather, in or for: furniture, upholstery, handbags, luggage, clothing, footwear, automotive upholstery, hospital beds/seats, and the like.

14. Use of the leather coating composition according to any of claims 1 to 6 as a top coat for synthetic leather, which leather coating composition, once cured, improves abrasion and scratch resistance.

15. The use of claim 14, wherein the top coat has a weibull abrasion resistance greater than or equal to 75,000 according to ASTM D4157-13.