Nylon 12 hot melt adhesive and preparation method thereof

Abstract

The invention discloses a nylon 12 hot melt adhesive and a preparation method thereof. The invention relates to a nylon composite material which comprises the following raw materials: a) caprolactam, b) laurolactam, c) at least one nylon salt raw material mixture consisting of C6-C14 dibasic acid and C5-C12 diamine, d) at least one nylon salt raw material mixture consisting of triamine and C2-C14 dibasic acid, e) low-molecular-weight nylon 22, and f) a medium-low-molecular-weight olefin polymer with epoxy and / or maleic anhydride groups. The nylon 12 hot melt adhesive disclosed by the invention has the advantages of good crystallization property, few residual monomers, good water resistance and dry cleaning resistance, high peel strength, good binding power and the like.

Description

technical field [0001] The invention mainly relates to a nylon 12 hot-melt adhesive and a preparation method thereof, belonging to the preparation technology of organic polymer materials. Background technique [0002] Polyamide (nylon) hot melt adhesive is a kind of hot melt adhesive obtained by polycondensation of various fatty dicarboxylic acids and fatty diamines. It has low melting temperature, narrow melting range, easy processing, wide application range and high bonding strength. , good flexibility and wear resistance, excellent aging resistance and other advantages, can be used in the bonding of clothing, leather, wood, plastic, metal and ceramics, etc. High-end materials. [0003] The polyamide amide groups of a single component are arranged in an orderly manner, and hydrogen bonds are easily formed between the amide groups, which are easy to crystallize and have a high melting point. Due to the limitations of the heat resistance of the bonded materials and constru...

AI Technical Summary

Problems solved by technology

Due to the limitations of the heat resistance of the bonded materials and construction energy consumption, the melting point of nylon hot melt adhesives needs to be controlled between 80-140 °C, and it is not easy to be too high. Therefore, it is necessary to randomly copolymerize multiple monomers to break its amide The regular arrangement of groups reduces the melting point of its products, but at the same time its crystallization properties will also be significantly reduced

The crystallization performance is reduced, which leads to a longer opening time of the hot melt adhesive and a lower construction efficiency. At the same time, it will lead to a decrease in cohesive strength and a decrease in the bonding effect of the product.

The existing domestic nylon hot melt adhesive is a terpolymer or tetrapolymer formed by melting and co-condensing caprolactam, nylon 66 salt, nylon 1010 salt, nylon 1012 salt, etc. in a high-pressure reactor. The raw material used is long carbon chain nylon 1010, nylon 1012 and other carbon chain lengths are lower than nylon 12, and the resulting products have low adhesion, high hardness, poor flexibility, poor abrasion resistance, washing resistance and dry cleaning resistance

Therefore, the introduction of lauryl lactam into the polymerization unit can improve the cohesiveness, flexibility, wear resistance and water washing resistance of the product; but under the condition of no modification, it is necessary to ensure a sufficient amount of long carbon chain nylon. In order to ensure the crystallization performance of the copolymerized product, because the cost of long carbon chain raw materials is high, it is not suitable to add too much, so there is an urgent need for a modification method that can not only ensure the crystallization ability of the product, but also ensure its flexibility and cohesiveness and other comprehensive conditions, while controlling the cost within an acceptable range

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