A kind of pur hot-melt adhesive for free-cleaning book binding and preparation method thereof

Abstract

The invention belongs to the technical field of hot-melt adhesives, and more particularly relates to a PUR hot-melt adhesive for free-cleaning book binding and a preparation method thereof. The invention relates to a PUR hot-melt adhesive for free-cleaning book binding. The preparation raw materials include: polyester polyol, polyether polyol, isocyanate, chain extender, and nanoparticles. The PUR hot-melt adhesive for free-cleaning bookbinding prepared by this application can better penetrate into the paper, and can further micro-crosslink with the fiber molecules in the paper, ensuring the adhesion to the paper; The synergy between polyols, isocyanates, nanoparticles, and damping agents avoids the adhesion of moisture, dust, and other pollutants on the surface of books, and improves the self-cleaning performance and stain resistance of hot melt adhesives.

Description

technical field [0001] The invention belongs to the technical field of hot-melt adhesives, and more particularly relates to a PUR hot-melt adhesive for free-cleaning book binding and a preparation method thereof. Background technique [0002] With the high speed and automation of post-press binding technology and the improvement of people's requirements for the quality of book binding, hot melt adhesives for book binding have been favored by more and more printing manufacturers. At present, in the domestic market, there are many types of hot melt adhesives, and the quality and quality of the products are also different. [0003] Most of the traditional wireless book binding uses EVA (ethylene vinyl acetate copolymer) hot melt adhesive. At present, the EVA hot melt adhesive used for book wireless binding is generally used at a temperature between 160°C and 180°C. , and high-temperature use will lead to two problems: 1) long-term high-temperature use requires high energy cons...

AI Technical Summary

Problems solved by technology

[0003] Most of the traditional book binding uses EVA (ethylene vinyl acetate copolymer) hot melt adhesive. At present, the EVA hot melt adhesive used in book binding is generally used at a temperature between 160°C and 180°C. , and high temperature use will lead to two problems: 1) Long time high temperature use requires high energy consumption, which consumes a lot of electric energy and heat energy, which is contrary to the energy-saving production vigorously promoted by the government; 2) Long time high temperature use leads to colloid The tackifying resin inside ages and decomposes. On the one hand, the volatiles produced by the decomposition will pollute the environment. On the other hand, the aging of the resin will lead to carbonization of the colloid, which will affect the adhesive performance. The deposition of carbides will damage the melting equipment and increase Equipment maintenance and repair costs, equipment maintenance will affect production efficiency

Traditional EVA hot melt adhesive has poor water and heat resistance, poor creep resistance, low strength, and poor flatness of books

[0004] A new generation of bookbinding hot melt adhesives-reactive polyurethane hot melt adhesives (PUR hot melt adhesives) has also appeared on the market, which solves the lack of performance of some EVA hot melt adhesives, but polyurethane hot melt adhesives are moisture-curing reactive hot melt adhesives. Adhesive, when operating and using, needs to be used up immediately, and cannot be exposed to the air for a long time, which will bring great difficulties to the operation and use, and need to be cleaned continuously, resulting in waste of hot melt adhesive and increased waste of manpower and material resources

At the same time, there are still some problems in the flatness of some PUR book hot melt adhesive books on the market, which need to be improved.