Polyolefin substrate adhesion promoter and preparation method thereof

Abstract

The invention provides a method for preparing a polyolefine substrate adhesion accelerant. Maleic anhydride, maleic dicarboxylic acid or fumaric dicarboxylic acid reacts with chloridized polyolefine; an amount of an additive is added; byproducts are removed in vacuum, thus getting the adhesion accelerant. In the process, oxo polar groups are added to the chloridized polyolefine; the synthetic product is uniform and transparent with high environmental stability. When the diluted adhesion accelerant is used for treating polypropylene and polyethylene substrates, namely, grounding, the adhesion between the coating and the polyolefine is significantly improved; when the accelerant is mixed with acrylic resin, polyolefine coating with excellent overall performance of consistency, adhesion and so on can be prepared.

Description

A kind of polyolefin substrate adhesion promoter and preparation method thereof technical field The invention relates to a preparation process of a polyolefin substrate adhesion promoter, in particular to a preparation method of a polyolefin substrate adhesion promoter suitable for enlarged production. Background technique Polyolefin (including polyethylene, polypropylene, etc.) plastics have the advantages of low price, easy molding and processing, corrosion resistance, and good overall performance, and are widely used in the fields of automobiles, home appliances, and building materials. However, the non-polar molecular structure of polyolefin materials leads to low surface energy and poor wettability, which often make the adhesion between them and coatings difficult to meet practical requirements. One of the effective ways to enhance the adhesion between polyolefin substrates and topcoats and improve the coating effect of coatings on polyolefin substrates is to use chlo...

AI Technical Summary

Problems solved by technology

On the one hand, the addition of reactants in solid form is not conducive to the continuous operation of the production process; on the other hand, adding a large amount of peroxide initiator at one time during industrial scale-up production will lead to danger or accidents

In addition, the maleic anhydride polymer in the system will remain in the product, which will affect the appearance of the coating when it is directly used as an adhesion promoter

Although the purified chlorinated polyolefin can also be used as an adhesion promoter, the separation and purification of the chlorinated polyolefin in the reaction mixture needs to be precipitated and washed with organic solvents such as acetone and methanol. In large-scale production, not only Increased costs, and the use of a large amount of organic solvents can also pose a threat to the health of operators and the environment

In addition, the adhesion promoters obtained by the above methods tend to release hydrogen chloride during storage, which corrodes the storage equipment