Curing agent, preparation method thereof and application of curing agent in preparation of polyacrylate pressure-sensitive adhesive

Abstract

The invention relates to a curing agent, a preparation method of the curing agent and application of the curing agent in preparation of polyacrylate pressure-sensitive adhesives, the curing agent is a diisocyanate-terminated oligomer obtained by reaction of a compound containing reactive hydrogen atoms and diisocyanate, the curing agent provided by the invention contains a plurality of hydrolyzable groups, according to the present invention, the curing agent is hydrolyzed, the hydrolyzed substance is easily degraded through oxidation decarboxylation and other modes, and then the hydrolyzed substance is introduced into the adhesive, such that the prepared pressure-sensitive adhesive has characteristics of high curing agent corresponding component content and many hydrolysis groups so as to achieve good final biodegradability;

Description

technical field [0001] The invention relates to the technical field of organic polymers, in particular to a curing agent, a preparation method thereof and the application of the curing agent in preparing polyacrylate pressure-sensitive adhesives. Background technique [0002] In January 2020, the Ministry of Ecology and Environment issued an opinion on further strengthening plastic pollution control. Regarding the field of express plastic packaging, it pointed out that by the end of 2025, postal express outlets across the country will ban the use of non-degradable plastic tapes. Therefore, various provinces and cities have introduced relevant policies, all of which have mentioned the use of degradable tapes instead of non-degradable plastic tapes. [0003] Polyacrylate pressure-sensitive tape, as the most commonly used tape at present, has the advantages of high bonding strength, excellent weather resistance, and good low-temperature performance, and is widely used. However...

AI Technical Summary

Problems solved by technology

However, the commonly used isocyanate curing agent has a small molecular weight, and when the amount of curing agent added is small, the prepared adhesive has fewer degradable parts and poor degradability. If the added amount is too high, the degree of cross-linking will be too high, so that the final pressure-sensitive adhesive will have a high hardness, poor bonding performance, and cannot be used.

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