CN-122013547-A - Organic silicon synthetic leather surface layer and preparation method thereof

CN122013547ACN 122013547 ACN122013547 ACN 122013547ACN-122013547-A

Abstract

The application relates to the field of organic silicon synthetic leather, and discloses an organic silicon synthetic leather surface layer and a preparation method thereof, the surface layer comprises a base layer, a bonding layer, a middle layer and a leather surface layer, wherein the leather surface layer is formed by solidifying leather surface layer glue containing raw materials such as base glue, special handfeel agent and the like. The base adhesive is compounded with two kinds of vinyl end-capped polydimethyl siloxane with different viscosities, and the hand feeling agent is prepared through hydrosilylation reaction of alpha-olefin and Si-H containing organopolysiloxane, and the specific preparation process of the components and the surface layer is also disclosed. The application effectively solves the problems of insufficient wear resistance, poor smooth hand feeling and the like of the traditional organic silicon synthetic leather, also improves the defects of high cost, easy migration of auxiliary agents and the like, and the prepared product has excellent wear resistance, smoothness, folding resistance and stain resistance, meets the use requirements in the high-end field and promotes the development of high-end greening of the industry.

Inventors

FANG JING
Luo Yedong
MEI JINBO
JIN YE
XU YONGLIANG

Assignees

合盛硅业(嘉兴)有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. The organic silicon synthetic leather surface layer is characterized by comprising a base layer, a bonding layer, an intermediate layer and a leather surface layer, wherein the leather surface layer is obtained by curing leather surface layer glue, the intermediate layer is obtained by curing intermediate layer glue, the bonding layer is obtained by curing bonding layer glue, and the leather surface layer glue is prepared from the following raw materials of base glue, vinyl-containing polydimethylsiloxane, vinyl-containing silicone resin, a flatting agent, a handfeel agent, an inhibitor, matting powder, a crosslinking agent, a catalyst and color paste.
2. The silicone synthetic leather facing of claim 1, wherein the handle agent is prepared from a raw material comprising Si-H containing organopolysiloxane and alpha-olefin.
3. The method for preparing the hand feeling agent is characterized in that the alpha-olefin, the first solvent and the first catalyst are heated and activated for a period of time in a reaction container to prepare a mixed solution, the organopolysiloxane containing Si-H is added into the mixed solution, the temperature is raised and the temperature is kept for a period of time, and the first solvent and the low-boiling-point substances are removed after the reaction is completed to prepare the hand feeling agent.
4. The silicone synthetic leather facing of claim 2, wherein the molar ratio of the alpha-olefin to the silanol groups in the Si-H containing organopolysiloxane is (0.3-0.8): 1.
5. The organic silicon synthetic leather surface layer according to claim 1, wherein the base adhesive is prepared from vinyl-terminated polydimethylsiloxane, fumed silica, hexamethyldisilazane, divinyl tetramethyl disilazane, hydroxyl silicone oil and water.
6. The silicone synthetic leather facing of claim 5, wherein the vinyl-terminated polydimethylsiloxane comprises a first vinyl-terminated polydimethylsiloxane and a second vinyl-terminated polydimethylsiloxane, the first vinyl-terminated polydimethylsiloxane has a viscosity of 500 to 5000 mpa.s, and the second vinyl-terminated polydimethylsiloxane has a viscosity of 10000~20000 mPa.s.
7. The silicone synthetic leather facing of claim 6, wherein the mass ratio of the first ethylene-terminated polydimethylsiloxane to the second ethylene-terminated polydimethylsiloxane is (2-4): 1.
8. The method for preparing the base adhesive according to claim 6, wherein a part of the first vinyl-terminated polydimethylsiloxane and the second vinyl-terminated polydimethylsiloxane are added into a kneader, the fumed silica, the hexamethyldisilazane, the divinyl tetramethyl disilazane, the hydroxyl silicone oil and the water are added into the kneader for multiple times, the mixture is uniformly mixed and heated for reaction, the low-boiling-point substances are removed, the temperature is reduced, the rest of the first vinyl-terminated polydimethylsiloxane is added, and the mixture is stirred for continuous reaction, so that the base adhesive is prepared.
9. The preparation method of the organic silicon synthetic leather surface layer is characterized by comprising the following preparation steps: S1, adding part of first vinyl-terminated polydimethylsiloxane and second vinyl-terminated polydimethylsiloxane into a kneader, adding gas-phase white carbon black, hexamethyldisilazane, divinyl tetramethyl disilazane, hydroxyl silicone oil and water for multiple times, uniformly mixing and heating for reaction, cooling after removing low-boiling substances, adding the rest of first vinyl-terminated polydimethylsiloxane, and stirring for continuous reaction to obtain base rubber; S2, heating and activating alpha-olefin, a first solvent and a first catalyst in a reaction container for a period of time to prepare a mixed solution, adding Si-H-containing organopolysiloxane into the mixed solution, heating and reacting for a period of time in a heat-preserving manner, and removing the first solvent and low-boiling-point substances after the reaction is finished to prepare the chiral agent; s3, heating and stirring the base adhesive, the vinyl-containing polydimethylsiloxane, the vinyl-containing silicone resin and the flatting agent in a stirrer, then adding an inhibitor, extinction powder, a cross-linking agent, the handfeel agent and color paste, uniformly stirring, adding a second catalyst, and defoaming to obtain leather surface layer adhesive; s4, coating the leather surface layer adhesive on release paper, baking and curing to obtain a leather surface layer, coating an intermediate layer adhesive on the surface of the leather surface layer, curing to obtain an intermediate layer, coating a bonding layer adhesive on the surface of the intermediate layer, bonding the base cloth with the bonding layer, baking and curing, and stripping the release paper to obtain the organic silicon synthetic leather surface layer.
10. The method according to claim 9, wherein the leather surface layer adhesive has a coating thickness of 100 to 250 μm, the intermediate layer adhesive has a coating thickness of 200 to 300 μm, and the tie layer adhesive has a coating thickness of 80 to 150 μm.

Description

Organic silicon synthetic leather surface layer and preparation method thereof Technical Field The application relates to the field of organic silicon synthetic leather, in particular to an organic silicon synthetic leather surface layer and a preparation method thereof. Background Along with the acceleration transformation of global manufacturing industry to high-end and green directions, the front fields of automotive interiors, intelligent wearing equipment, medical protection, precise instruments and the like provide more severe performance requirements on weather resistance, wear resistance, touch comfort and biocompatibility of leather materials, the conventional artificial leather such as PU leather, PVC leather and the like needs a large amount of organic solvents and plasticizers in the production process, high environmental load is brought, and various performance defects which are difficult to overcome are also caused, wherein the PVC leather can release strong choking hydrogen chloride gas when being burnt, the PU leather has the problems of poor antifouling property, weak salt fog resistance, easy yellowing, heavy metal residues and the like, the problems of poor biocompatibility caused by solvent residues, plasticizer migration and the like, the problem of easy induction of sensitive crowd allergic reaction cannot be adapted to the use requirements of high-end application scenes, the conventional artificial leather has excellent hydrophobicity, high-low temperature resistance and biocompatibility by virtue of a unique-Si-O-Si main chain structure and methyl spiral arrangement characteristic, the conventional artificial leather is replaced by the conventional artificial leather, the conventional artificial leather has the problems of poor antifouling property, the problems of poor salt fog resistance, the conventional artificial leather has the problems of low-resistance, the wear resistance of the conventional artificial leather has the mechanical seat has the problem of being difficult to achieve, the poor friction coefficient, the conventional mechanical stability is high, the poor friction coefficient is high, the wear resistance is difficult to achieve, the problem is difficult to achieve, the mechanical fatigue resistance is high, and has the problem is difficult to cause the abrasion resistance is poor, and has the abrasion resistance is difficult to cause, and has a poor friction resistance, and has a high friction resistance. In order to improve the wear resistance and the slipping performance of the organic silicon synthetic leather, a plurality of technical research and development and improvement are carried out by the technical staff in the prior art, but the prior art has obvious application limitation, the scheme of adopting vinyl fluorosilicone oil to improve the wear resistance and the slipping performance can be adopted, the cost of the vinyl fluorosilicone oil is far higher than that of common silicone oil, the processing technology is strict, the proportion of vulcanization temperature to a catalyst needs to be precisely controlled, the problems of uneven cross-linking, attenuated performance and the like are easy to occur, the popularization and the application of the organic silicon-polyurethane hybrid prepolymer in the civil market are limited, the compatibility of the prepolymer and an organic silicon leather substrate is too high, the slipping component lacks power for transferring to the surface, the smooth touch feeling of a leather surface cannot be directly endowed, the additional coating procedure of a hand feeling layer is required to be additionally arranged, the problems of transferring wax powder, the surface oil film, the poor durability of a surface slipping layer and the like exist in the scheme of adding auxiliaries such as PE wax powder, the surface smoothness layer and the like, the appearance and the long-term use stability of the leather surface are influenced, the technical hardness is improved only through the improvement of the vinyl silicone resin to enhance the wear resistance, the smoothness of the leather surface is very limited, and the overall effect is quite limited. In conclusion, the existing organic silicon synthetic leather surface layer technology cannot synchronously solve the core problems of insufficient wear resistance and poor smooth hand feeling, meanwhile, the defects of high cost, complex process, easy migration and precipitation of auxiliary agents, poor durability of a smooth layer and the like are commonly existed, and severe use requirements of high-end fields such as automobile interior decoration, intelligent wearing, medical protection, precise instruments and the like on organic silicon leather are difficult to meet, so that the organic silicon synthetic leather surface layer which does not need high-price fluorosilicone oil and has simple production process and can realize cooperative promotion of self-lubrication and hig