Two-component polyurethane resin for metal packaging tanks, and preparation method thereof

Abstract

The invention relates to a two-component polyurethane resin for metal packaging tanks, and a preparation method thereof. The host of the two-component polyurethane resin comprises, by mass, 25-50% of polyester polyol, 5-15% of epoxy resin, 0.2-1.0% of a coupling agent and 35-65% of a solvent; a curing agent is polyisocyanate, and the host is mixed with the curing agent according to a mass ratio of 100:5-20; and the hydroxy group of the host reacts with isocyanate in the curing agent to generate polyurethane. The polyester polyol is prepared through ester interchange of dimetyl terephthalate, dicarboxylic acid, acid anhydride, dihydric alcohol and polyol, esterification and a condensation polymerization reaction, or is prepared through esterification of the dicarboxylic acid, the acid anhydride, the dihydric alcohol and the polyol, and the condensation polymerization reaction. The preparation method has the advantages of easily available raw materials, simplicity and reliability. The two-component polyurethane resin can be well bonded with a metal substrate and a film, has good deep punching, corrosion and boiling resistance, and can be widely used in the metallic tank industry.

Description

technical field

[0001] The invention relates to a polyurethane adhesive for metal packaging cans and a preparation method thereof, in particular to a solvent-type two-component polyurethane resin and a preparation method thereof. Background technique

[0002] Laminated iron refers to a composite material that combines plastic film on tinplate or cold-rolled sheet. It has the characteristics of both resin and iron materials. It has smooth appearance, lubrication, good decoration, good hand feeling, corrosion resistance and aging resistance. Good, deep drawing resistance and good formability, etc., can be widely used in the metal can industry. Compared with traditional painted iron, it has incomparable excellent corrosion resistance and can-making performance, which improves the physical and chemical stability and appearance decoration of packaging containers. At the same time, the production speed of laminated iron is fast, the efficiency is high, and the temperature of the ...