Preparation method of thermosetting type composite adhesive

Abstract

The invention provides a preparation method of a thermosetting type composite adhesive, which comprises the steps of preparing polyester polyol and preparing thermosetting composite adhesive, wherein the polyester polyol is prepared through primary esterification, secondary esterification and condensation polymerization; dimethyl terephthalate (DMT) and diglycol are added to a polyester synthesis kettle to carry out the primary esterification; dimeric dibasic acid, m-phthalic acid, nonane diacid and 1,3-butanediol are added to the polyester synthesis kettle in which the primary esterification reaction is finished to carry out the secondary esterification; low vacuumizing, high vacuumizing and long vacuumizing are sequentially carried out for the polyester synthesis kettle in which the secondary esterification is finished, and the polycondensate generated after the condensation polymerization is the polyester polyol; the thermosetting composite adhesive is prepared by mixing evenly the prepared polyester polyol, enclosed type isocyanate tripolymer, a component solvent, titanic acid ester chelon, tackifying resin and plasticizer. The thermosetting type composite adhesive prepared by the method has excellent bonding intensity when used for bonding PVC and an armor plate without chemical treatment for the surface.

Description

technical field [0001] The invention relates to the field of adhesive preparation, in particular to a method for preparing a thermosetting composite adhesive used when PVC is compounded with a steel plate. Background technique [0002] The initial product of color steel plate is pre-coated steel plate PCM product, which appeared in the United States in the 1930s and was used to replace wooden plates as window panels for shutters. With the development of European economy and construction industry, as well as the progress of science and technology, PCM products have been greatly developed. At present, Europe, North America and East Asia are developing particularly rapidly, and the product categories have also developed to color laminated steel plate VCM and environmentally friendly color steel plate ECM. The research, development and production of colored steel plates and their subsequent processing products include: high-end colored laminated steel plates VCM for home applia...

AI Technical Summary

Problems solved by technology

[0003] Adhesives for color steel plates currently occupy a huge market. At present, most of the adhesives used in the lamination of domestic color steel plates are imported acrylic adhesives, such as figure 1 As shown, the structure of the color steel plate is a composite structure made of PET, VMPET, PVC, AD and steel plates, generally bonded by acrylic or ordinary hot-melt adhesives, from figure 1 It can be seen from the figure that when the PVC layer 4 is bonded to the steel plate 1, the surface of the steel plate 1 must be chemically treated, a chemically treated layer 2 is provided, and an acrylic or common hot-melt adhesive 3 is added to the chemically treated layer to achieve Make PVC4 and the steel plate 1 that has done surface chemical treatment to form chemical treatment layer 2 to have comparatively good bonding fastness, but then can't guarantee bonding fastness to the steel plate that has not been done surface chemical treatment to form chemical treatment layer, like this not only It increases the complexity of the process and virtually increases the composite cost of the color steel plate, and the product after the composite of the acrylic adhesive and the ordinary hot-melt adhesive has poor stability of high-temperature bonding fastness

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