Preparation method of hyper-branched macromolecular adhesion promoter for paint

Abstract

The invention discloses a preparation method of a hyper-branched macromolecular adhesion promoter for paint. The preparation method comprises the following steps: a) under normal temperature and normal pressure, adding polyol ether, polybasic acid and a first catalyst into a four-mouth flask provided with a stirrer and a condensation device respectively; then introducing nitrogen gas into the four-mouth flask; b) raising the temperature of the four-mouth flask to be 90 DEG C to 250 DEG C and continually stirring under the normal pressure for 1h to 10h; then closing the nitrogen gas and vacuumizing for 1h to 5h; standing and naturally cooling a mixture to room temperature, so as to obtain a polyhydroxy hyper-branched polymer; c) adding a modifier and a second catalyst into the polyhydroxy hyper-branched polymer obtained in step b) and stirring at 50 DEG C to 200 DEG C for 1h to 10h; d) adding a solvent which accounts for 30 percent to 70 percent of the total mass of reactants and continuously stirring for 0.5h to 1h; then naturally cooling to the room temperature, so as to obtain the hyper-branched macromolecular adhesion promoter for the paint. The adhesion promoter prepared by the preparation method disclosed by the invention has a good adhesion property and also has good compatibility and storage stability.

Description

technical field [0001] The invention relates to the field of paint additives in refining, in particular to a preparation method of a hyperbranched polymer adhesion promoter for paint. Background technique [0002] With the continuous development of my country's economy, the technology of industrial coatings is also becoming more and more perfect. It is mainly used in occasions such as building exterior walls, large-scale flat products and interior decoration. In the coating process of coatings, due to the low polarity of the substrate itself, its surface is poor in flatness and is easily polluted by the external environment, so the coating film in the substrate is often greatly reduced during coating. Adhesion performance. In order to overcome the problem of low film adhesion, adhesion promoters are usually added to current industrial coatings. On the one hand, the adhesion promoter wets and adsorbs the nonpolar group of the substrate to the surface of the substrate, there...

AI Technical Summary

Problems solved by technology

However, the above three adhesion promoters have major technical defects that cannot be overcome by themselves

First of all, metal adhesion promoters are mainly used in non-polar systems, and their solubility in the system is generally extremely poor, and they have disadvantages such as small molecular weight and poor stability, so their applications are very limited

Secondly, although the silane coupling agent adhesion promoter can be applied to the surface of various substrates such as metal, glass, plastic, etc., its own hydrolysis resistance is poor, and it is easy to produce hydrolysis reaction and decompose after long-term storage. Therefore, the storage stability of silane coupling agent adhesion promoters is poor, which seriously restricts its wide use.

Finally, the modified polymer resin adhesion promoter has good compatibility with most coating and ink systems, and its storage stability is good, but when used on different types of substrates, it needs to be specific Different substrate systems adjust the formulation of the adhesion promoter, resulting in poor versatility in different substrate systems

Images