Adhesive for pp substrate and preparation method and application thereof

Abstract

The invention provides an adhesive for PP base material, a preparation method and application thereof. The adhesive includes components A, B and C; component A is an end-capped prepolymer, and based on the total molar amount of end-capping groups in component A, the end-capping groups in component A at least include moles The percentage is 60% of isocyanate groups, the rest are silane groups; B component is a non-reactive diluent; C component is a catalyst; A component is prepared from raw materials including S1, S2, S3, S4 and S5, wherein , S1, S2, S3, S4 and S5 are diisocyanates, polyether polyols, polyester polyols containing pendant methyl groups, hydroxyl-terminated liquid rubbers and small molecules containing both silane groups and primary / secondary amine groups, respectively End-capping agent, its parts by weight are respectively 8.5-20, 10-60, 5-50, 5-20 and 0-8; the parts by weight of components B and C are respectively 0-20 and 0.1-0.6. The adhesive is applied to PP base material and has good bonding effect. Its preparation method is simple.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an adhesive used for PP base materials, a preparation method and application thereof. Background technique [0002] As one of the five general-purpose plastics, polypropylene (PP) is non-toxic and tasteless, has a wide range of sources, 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, which makes it difficult to adhere compared with general plastic products. In order to improve the adhesion to the PP surface, 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 energ...

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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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