Solvent-free genuine leather laminating adhesive and preparation method thereof

Abstract

The invention discloses a solvent-free genuine leather laminating adhesive and a preparation method thereof. The solvent-free genuine leather laminating adhesive is formed by uniformly mixing a component A, a component B and a component C, and the component A is composed of diethylene glycol, 1,2-propylene glycol and sebacic acid according to a weight percentage ratio of 3:3:4; the component B iscomposed of xylylene diisocyanate, methylene diphenyl diisocyanate and polyether polyol according to a weight percentage ratio of 3:3:4, and the hydroxyl value of the polyether polyol is 112 mgKOH / g;the component C is composed of 2,6-di-tert-butyl-p-cresol and 3,5-dimethylpyrazole according to a weight percentage ratio of 1:1; and a weight percentage ratio of the component A to the component B tothe component C is 5:8:2. The service life of the solvent-free genuine leather laminating adhesive is greatly prolonged, so that the use effect is prevented from being greatly reduced as time goes on; an excellent adhesive effect can be achieved while ensuring the coating flexibility; and the evaporation efficiency of water is greatly improved while a mixed liquid is fully and uniformly mixed.

Description

technical field [0001] The invention relates to the technical field of leather lamination glue, in particular to a solvent-free leather lamination glue and a preparation method thereof. Background technique [0002] During the use of solvent-based leather laminating glue, it is easy to cause environmental and safety problems due to solvent volatilization. With the continuous strengthening of people's environmental protection awareness, solvent-free leather laminating glue has been widely used. [0003] However, in the document whose publication number is CN108997739A, only the method of blending and heating and curing is used to obtain a collagen fiber-based solvent-free polyurethane composite material with solvent-free polyurethane as the skeleton and collagen fibers running through it, so that a large number of collagen fibers The solid waste is processed, which solves the pollution problem; and compared with the existing solvent-free leather lamination glue and its prepar...

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Problems solved by technology

[0003] However, in the document whose publication number is CN108997739A, only the method of blending and heating and curing is used to obtain a collagen fiber-based solvent-free polyurethane composite material with solvent-free polyurethane as the skeleton and collagen fibers running through it, so that a large number of collagen fibers The solid waste is processed, which solves the pollution problem; and compared with the existing solvent-free leather lamination glue and its preparation method, it is still prone to the high reactivity of the NCO group, making its storage life longer. Affected, and the use effect will be greatly reduced over time, it is difficult to ensure the flexibility of the coating, but also can play an excellent adhesive effect; and it is also easy to consume due to the high reactivity of the NCO group A large number of NCO groups react with a small amount of water to form urea and release carbon dioxide gas, thus incorporating a large number of by-products that will affect the overall quality. It is difficult to greatly improve the evaporation efficiency of water while ensuring that the mixed liquid is fully mixed.

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