Adhesive for PP substrate as well as preparation method and application of adhesive

Abstract

The invention provides an adhesive for a PP substrate as well as a preparation method and application of the adhesive. The adhesive comprises a component A, a component B and a component C, wherein the component A is an end-capped prepolymer, and on the basis of the total molar weight of end-capped groups in the component A, the end-capped groups in the component A at least comprise isocyanate groups with a molar percentage of 60%, with the balance being silane groups; the component B is a non-active diluent; the component C is a catalyst; the component A is prepared from raw materials including, in parts by weight, 8.5 to 20 parts of S1, 10 to 60 parts of S2, 5 to 50 parts of S3, 5 to 20 parts of S4 and 0 to 8 parts of S5, and the S1, S2, S3, S4 and S5 are diisocyanate, polyether polyol, polyester polyol containing a side methyl group, hydroxyl-terminated liquid rubber and a small molecular end-capping reagent containing both silane groups and primary / secondary amino groups, respectively; and the weight parts of the component B and the component C are 0-20 and 0.1-0.6 respectively. The adhesive has a good bonding effect when applied to the PP substrate. The preparation method is simple.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to an adhesive for PP substrates and a preparation method and application thereof. Background technique [0002] As one of the five general-purpose plastics, polypropylene (PP) is non-toxic, tasteless, wide source, low price, simple manufacturing process, excellent mechanical properties, heat resistance and chemical stability, and is widely used in industrial products, daily necessities, Automotive, packaging materials and other fields. However, since PP is a non-polar polymer, its surface tension is low and its crystallinity is high, compared with general plastic products, it is difficult to adhere. In order to improve the adhesion to the surface of PP, surface treatment is generally carried out by methods such as flame treatment, plasma treatment, radiation method, microwave method and corona discharge method to increase its surface energy. However, these trea...

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Problems solved by technology

[0004] However, the above-mentioned adhesives all contain a large amount of organic solvents, which not only cause certain harm to the environment, but also easily cause fires due to excessive local temperatures during transportation and use.

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