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

A two-component polyurethane and metal packaging can technology, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of complex preparation process, unstable product quality, high production cost, etc., and achieve raw materials Easy to obtain, simple and reliable preparation method, and stable product quality

Active Publication Date: 2015-03-25
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the adhesive is complicated, the production cost is high, and the low molecular weight polyester polyol process is strictly controlled, resulting in unstable product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 127.32 g of isophthalic acid, 112.0 Kg of adipic acid, 45.7 Kg of ethylene glycol, and 115.0 Kg of neopentyl glycol into the reaction kettle, add 0.2 Kg of tetrabutyl titanate, and gradually raise the temperature to 240 ° C, during which the fractionation tower is controlled The top temperature is 100-110°C, when the amount of distilled water is 55.19Kg, the top temperature drops to 60°C, and the acid value is 25.73mgKOH / g for sampling analysis. From 0.02 to 0.08MPa, increase by 0.02MPa every hour, and then start high vacuum 0.099 to 0.1MPa. After 5 hours, the measured hydroxyl value is 8.71mgKOH / g, and the acid value is 0.76mgKOH / g.

[0026] Remove the vacuum from the reactor, lower the temperature to 150°C, add 370Kg of ethyl acetate to it for dilution, when it drops to 75°C, add 50.0Kg of E21 to continue to dissolve and dilute, and add 1.48Kg of γ-shrink Glyceryl ether oxypropyl trimethoxysilane, stirred evenly and discharged, used as the main agent, used in conj...

Embodiment 2

[0028] Add 302.95Kg dimethyl terephthalate, 96.88Kg ethylene glycol, 97.53Kg neopentyl glycol, 73.63Kg 1,6-hexanediol into the reaction kettle, add 0.2Kg tetrabutyl titanate, and blow in nitrogen , Gradually raise the temperature to 200°C, during which the top temperature of the fractionation tower is controlled at 60-70°C, when the amount of distilled methanol is 99.84Kg, the top temperature drops to 40°C, and then 92.35Kg of phthalic anhydride and 136.75Kg of adipic acid are added to the reactor During the process, the temperature was gradually raised to 230°C. During this period, the top temperature of the fractionation tower was controlled at 100-110°C. When the amount of distilled water was 44.93Kg, the top temperature dropped to 60°C. The acid value of the sampling analysis was 23.90 mgKOH / g, and the feeding of nitrogen was stopped. Keep it at 230°C, start vacuuming gradually, the vacuum degree is from 0.02 to 0.08MPa, increase by 0.02MPa every 1 hour, and then start to p...

Embodiment 3

[0031]Add 168.37Kg dimethyl terephthalate, 49.53Kg ethylene glycol, 82.95Kg neopentyl glycol, and 42.27Kg diethylene glycol into the reaction kettle, add 0.2Kg tetrabutyl titanate, and blow in nitrogen , Gradually raise the temperature to 200°C, during which the top temperature of the fractionation tower is controlled at 60-70°C. When the amount of distilled methanol is 55.49Kg, the top temperature drops to 40°C, and then 86.4Kg of isophthalic acid and 70.16Kg of sebacic acid are added to the reactor During the process, the temperature was gradually raised to 230°C. During this period, the top temperature of the fractionation tower was controlled at 100-110°C. When the amount of distilled water was 31.21Kg, the top temperature dropped to 60°C. The acid value of the sampling analysis was 21.14mgKOH / g, and the feeding of nitrogen was stopped. Keep it at 230°C, start vacuuming step by step, the vacuum degree is from 0.02 to 0.08MPa, increase by 0.02MPa every 1 hour, and then start...

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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 ...

Claims

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Application Information

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IPC IPC(8): C09J175/06C08G63/183C08G63/181C08G63/672C08G63/78
Inventor 王雪琴吴明江蔡彦吴旭李亚勇
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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