A kind of organopolysiloxane synthetic leather and its preparation method

Abstract

Disclosed are a polysiloxane synthetic leather and a manufacturing method therefor, the polysiloxane synthetic leather comprising a polysiloxane surface layer, a silica gel adhesive layer and a substrate layer, which are stacked in sequence from top to bottom, wherein the polysiloxane surface layer is formed by curing a polysiloxane coating liquid, and the silica gel adhesive layer is formed by curing a silica gel coating liquid; the polysiloxane coating liquid contains 25-85 parts of a photosensitive polysiloxane, 0-20 parts of a photosensitive modified filler, 0-20 parts of a filler, 0-70 parts of an environmentally friendly solvent, 0.7-5 parts of a photoinitiator, 0-20 parts of an organosilicone oligomer with photosensitive activity, 0-1 part of a toner and 0-0.1 parts of a platinum catalyst; and the silica gel coating liquid contains 70-90 parts of a liquid addition-type silicone rubber, 0-20 parts of a photosensitive modified filler and 0-20 parts of a colour paste. A photosensitive organopolysiloxane surface coating layer imparts the synthetic leather with smoothness and dust resistance without affecting the texture, which is made by means of a release paper on the surface of the leather, and the rubbing colour fastness thereof, and the degree of reaction can be conveniently controlled, thereby ensuring the adhesion between coating layers, causing the synthetic leather to be more durable and extending the service life of the synthetic leather.

Description

technical field [0001] The application belongs to the technical field of synthetic leather, and in particular relates to a polysiloxane synthetic leather and a preparation method thereof. Background technique [0002] The production of polysiloxane synthetic leather is a newly developed tanning technology in recent years. Compared with traditional PU and PVC leather, polysiloxane can endow synthetic leather with excellent environmental protection, anti-allergy, hydrolysis resistance, Pollution resistance and high and low temperature resistance. However, the friction coefficient of silicone material is relatively large, and the dynamic friction coefficient is generally greater than 2. The smoothness and self-adhesiveness are poor, which limits its application. The commonly used method in industry is to spray a layer of matte feel oil on the surface of silica gel to increase its smoothness. , but the matte feel oil uses a lot of solvents, the solvent content is generally grea...

AI Technical Summary

Problems solved by technology

The company's patent number 3155409 discloses a composite structure of silica gel surface, which details the structure and production method of the silica gel surface composite material, but the specific formula of the silica gel material and how to solve the problems of high friction coefficient and poor smoothness of the silica gel material are not disclosed in the patent

Patent No. 201110032603.6 discloses an environment-friendly silicone synthetic leather and its preparation method. The method adopts solid silicone rubber calendering technology for synthetic leather graining to prepare environment-friendly silicone synthetic leather. However, due to the rheology and Limited by the calendering process, the silicone coating cannot be made thin, the product is stiff, and cannot meet the basic smoothness requirements of synthetic leather, and the practicability is not good

Patent No. 201280003730.6 discloses a method of making synthetic leather by using different liquid silicone rubber coating solutions. After the synthetic leather is made, the method needs to spray matte hand oil on the synthetic leather again to achieve a smooth effect, and the process is cumbersome. , the pollution is extremely high, and after re-painting, the leather texture will be partially buried by the coating layer, the three-dimensional effect of the texture is poor, and the texture surface only has a matte effect, and it is impossible to make a smooth smooth texture. Patent No. 201410091143.8 A kind of organosilicon synthetic leather with three-layer structure and its preparation method are proposed, and soft and smooth organosilicon synthetic leather is produced, but because the block type organosilicon resin used in the surface layer is brittle after curing and molding, and Because the addition reaction is difficult to control the reaction degree, after curing, there is almost no vinyl group described in the patent on the surface, and its adhesion to the underlying silica gel is poor, and the resulting synthetic leather surface layer is easy to crack and fall off.

Simultaneously, the synthetic leather made by the manufacturing method described in the above-mentioned published organosilicon synthetic leather patent has the defect of insufficient rubbing color fastness due to the use of color paste.

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