Combination of modified polyurethane and aqueous polyurethane adhesive

A composition and polyurethane technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of poor initial bond strength and low peel strength, and achieve good water resistance

Active Publication Date: 2011-01-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of crosslinking agent and epoxy resin, the cohesive strength and bond strength of the modified waterb

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Example 1

After mixing 86g of hydroxyethyl acrylate, 65g of methacrylic acid, 106g of glycidyl methacrylate, 112g of vinyl trimethoxysilane and 60g of glycidyl tertiary carbonate, add benzoyl peroxide and 0.5g Alkyl mercaptan, the mixture is obtained; the mixture is added dropwise to the mixed solution of propylene glycol monomethyl ether and isopropanol at 130°C, the drop is completed within 3 hours, and the temperature is kept for 5 hours; then the benzoyl peroxide is added dropwise to the reaction mixture The isopropanol solution was incubated for 3 hours to obtain an aqueous hydroxy acrylate, in which the total amount of benzoyl peroxide was 2.3 g.

Nuclear magnetic resonance was performed on the polyurethane, and its hydrogen spectrum was as follows: 1 H NMR: 0.96 ppm, 1.11 to 1.53 ppm, 1.69 ppm, 2.27 ppm, 2.73 ppm, 2.96 ppm, 3.26 ppm, 3.98 to 4.15 ppm, 6.38 ppm. It can be seen that the polyurethane has a structure of formula (III), where R 1 Isophorone base, R 2 It is pol...

Example Embodiment

Example 2

Under the protection of nitrogen, add 240g methyl ethyl ketone, 88g dimethylolpropionic acid, 330g polyethylene adipate diol with a molecular weight of 1500 and 0.5g dibutyltin dilaurate to a four-necked flask, and heat to 75℃ Then, add 244g isophorone diisocyanate, after 2h reaction, add 50g 1,4-butanediol, after 2h reaction, cool to 40℃, add 48g dimethylethanolamine, stir for 20min, pressurize to remove butanone, The polyurethane is obtained.

Nuclear magnetic resonance was performed on the modified polyurethane, and its hydrogen spectrum was as follows: 1 H NMR: 1.20~1.51ppm, 1.67ppm, 1.76ppm, 2.18ppm, 2.32ppm, 2.51ppm, 2.67ppm, 3.01ppm, 3.36ppm, 3.56ppm, 3.61ppm, 3.70ppm, 3.98ppm, 4.23ppm, 4.37ppm, 4.60ppm, 5.98ppm, 6.98ppm. It can be seen that the polyurethane is a modified polyurethane with the structure of formula (I), wherein R 1 Is dicyclohexylmethyl, R 2 For polycaprolactone group, R 3 It is a triethanolamine group, n=5.

Example Embodiment

Example 3

Under the protection of nitrogen, add 150g of methyl ethyl ketone, 78g of dimethylolpropionic acid, 195g of polybutylene adipate diol with a molecular weight of 1000, 65g of E-31 type bisphenol A epoxy resin and 0.3g dibutyltin dilaurate, after heating to 77℃, add 256g dicyclohexylmethane diisocyanate, after 3h reaction, add 41g 1,4-butanediol, after 2h reaction, cool to 45℃, add 46g triethylamine , Stir for 25min and remove butanone under pressure to obtain polyurethane.

Nuclear magnetic resonance was performed on the modified polyurethane, and its hydrogen spectrum was as follows: 1 H NMR: 0.93ppm, 1.26ppm, 1.35ppm, 1.56~2.39ppm, 2.65ppm, 2.96ppm, 3.41ppm, 3.54~3.95ppm, 4.06ppm, 4.13ppm, 4.32ppm, 4.61ppm, 5.90ppm, 6.38ppm, 6.68 ppm, 7.48 ppm. It can be seen that the polyurethane is a modified polyurethane with the structure of formula (I), wherein R 1 For tolyl, R 2 It is polybutylene adipate base, R 3 It is a dimethylethanolamine group, n=5.

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PUM

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Abstract

The invention provides a compound with a structure shown as formula (I), wherein R1 is an isophorone group, hexyl, methyl cyclohexyl, dicyclohexyl methyl or methylphenyl, R2 is polyester group, R3 is a tertiary amine group, and m is the polymerization degree and is no less than 0 and no more than 12. The invention also provides an aqueous polyurethane adhesive combination, comprising the following compositions in parts by weight: 43-78 parts of modified polyurethane with a structure shown as the formula (I), 0.8-2 parts of waterborne wetting agent, 1-3 parts of waterborne flow agent, 1.3-3.5 parts of waterborne defoaming agent, 13-21 parts of waterborne cosolvent and 20-47 parts of crosslinking agent. The aqueous polyurethane adhesive combination has the advantages of good water resistance, strong bond strength, strong initial adhesive strength and strong peel strength and can be used as an adhesive for an interior decorating piece of a vehicle.

Description

technical field The invention relates to the technical field of adhesives, in particular to a modified polyurethane and a water-based polyurethane adhesive composition. Background technique Solvent-based polyurethane adhesive refers to an adhesive formed by dissolving or dispersing polyurethane in an organic solvent, which has the advantages of good elasticity, low temperature resistance, and excellent abrasion resistance. Solvent-based polyurethane adhesives are widely used in automotive interior parts PVC ( PVC) artificial leather, dashboards, fenders, door panels, carpets and headlining. However, solvent-based polyurethane adhesives contain toxic and harmful substances such as benzene, toluene, and xylene, which not only pollute the environment, but also endanger human health. Therefore, water-based polyurethane adhesives for automotive interior parts have become one of the research hotspots. The prior art has disclosed a variety of water-based polyurethane adhesives....

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/58C08G18/42C08G18/38C09J175/06
Inventor 张红明李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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