Waterborne silane modified polyurethane bonding agent and preparation method thereof

A polyurethane adhesive and silane modification technology, which is applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., can solve the problem of long-term moisture resistance and aging resistance, slow curing of polyurethane resin, and resin cured products. Bubbles and other problems can be achieved to improve the strength, fast curing and high bonding strength

Active Publication Date: 2016-04-06
SHANGHAI JINQIANG ADHESIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based polyurethane adhesives have the characteristics of solvent-free, pollution-free, good film-forming properties, and strong adhesion. However, polyurethane resin cures slowly, and it is easy to react with water vapor in the air during curing, causing bubbles or even cracks in the cured resin. , not long-term resistance to heat and humidity and aging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of water-based silane-modified polyurethane adhesive

[0024] Including the following steps:

[0025] (1) Dehydrate the 1:1 mixture of polytetrahydrofuran diol, tetramethyl-m-xylylene diisocyanate, dibutyltin dilaurate, hydroxyethyl acrylate and n-butanol under reduced pressure at 80°C for 0.5h respectively ,stand-by;

[0026] (2) Put 15g of polytetrahydrofuran diol and 8g of tetramethyl-m-xylylene diisocyanate into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, heat to 60°C, and slowly add 5g of acetone dropwise to dissolve 8g of epoxy resin, slowly and uniformly drop 0.5g of dibutyltin dilaurate at the same time, dropwise add 1g of dimethylol propionic acid after 2h of reaction, continue to react for 2h, the process is always carried out under the protection of nitrogen, and the temperature is lowered to 30 ℃ to obtain Polyurethane prepolymer Ⅰ;

[0027] (3) Add dropwise 2 g of a mixture of hydroxyethyl...

Embodiment 2

[0030] Embodiment 2: Preparation of water-based silane-modified polyurethane adhesive

[0031] (1) Dehydrate a 1:0.5 mixture of polytetrahydrofuran diol, tetramethyl-m-xylylene diisocyanate, dibutyltin dilaurate, hydroxyethyl acrylate and n-butanol under reduced pressure at 100°C for 1 h, stand-by;

[0032] (2) Put 20g of polytetrahydrofuran diol and 10g of tetramethyl-m-xylylene diisocyanate into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, heat to 80°C, and slowly add 10g of acetone dropwise to dissolve 10g of epoxy resin, slowly and uniformly drop 1g of dibutyltin dilaurate at the same time, drop 2g of dimethylol propionic acid after 3 hours of reaction, continue to react for 3 hours, the process is always carried out under the protection of nitrogen, and the temperature is lowered to 50 ℃ to obtain polyurethane Prepolymer I;

[0033] (3) Add dropwise a mixture of 5 g of hydroxyethyl acrylate and n-butanol at a volume ratio of 1:0.5 ...

Embodiment 3

[0036] Embodiment 3: Preparation of water-based silane-modified polyurethane adhesive

[0037] Including the following steps:

[0038] (1) Dehydrate a 1:0.8 mixture of polytetrahydrofuran diol, tetramethyl-m-xylylene diisocyanate, dibutyltin dilaurate, hydroxyethyl acrylate and n-butanol under reduced pressure at 90°C for 0.8h respectively ,stand-by;

[0039] (2) Put 18g of polytetrahydrofuran diol and 9g of tetramethyl-m-xylylene diisocyanate into a three-necked flask equipped with a thermometer, a stirrer and a reflux condenser, heat to 70°C, and slowly add 8g of acetone dropwise to dissolve 9g of epoxy resin, slowly and uniformly drop 0.8g dibutyltin dilaurate at the same time, drop 1.5g dimethylolpropionic acid after 2.5h of reaction, continue to react for 2.5h, the process is always carried out under nitrogen protection, and the temperature is lowered to 40 ℃ to obtain polyurethane prepolymer Ⅰ;

[0040] (3) Add dropwise a mixture of 3.5 g of hydroxyethyl acrylate and ...

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Abstract

The invention discloses a waterborne silane modified polyurethane bonding agent and a preparation method thereof. The waterborne silane modified polyurethane bonding agent is prepared from the following raw materials in parts by weight: 15-20 parts of polyether glycol, 8-10 parts of diisocyanate, 1-2 parts of an acid, 2-5 parts of a silane coupling agent, 8-10 parts of epoxy resin, 5-10 parts of acetone, 0.5-1 part of a catalyst, 2-5 parts of an end-capping agent, 1-2 parts of trimethylamine, 10-15 parts of 1-methyl-2-pyrrolidinone and 45-50 parts of deionized water. According to the waterborne silane modified polyurethane bonding agent provided by the invention, the silane coupling agent and polyurethane resin are compounded, and the silane coupling agent has the characteristics of being fast to cure, free of foaming during curing, and excellent in dampness-heat and aging resistance, so that the performance of a polyurethane bonding agent is improved; meanwhile, through addition of tetramethyl isophthalylidene diisocyanate, the strength, bonding force, appearance, flexibility and durability of the a waterborne polyurethane adhesive can be improved. Therefore, the developed waterborne silane modified polyurethane can be resistant to 60 minutes' boiling at 100 DEG C, and has high bonding strength to various hydrophilic and hydrophobic substrates.

Description

technical field [0001] The invention belongs to the technical field of adhesive preparation, and relates to a water-based silane-modified polyurethane adhesive and a preparation method thereof. Background technique [0002] Water-based adhesives use water as the basic medium, and have the characteristics of non-flammability, low odor, no environmental pollution, energy saving, and convenient operation and processing. Water-based adhesives replace solvent-based adhesives, which can improve the working environment, reduce pollution, reduce work intensity, and avoid fire hazards. Danger is very effective. The replacement of solvent-based products by water-based adhesives has become a general trend. Water-based polyurethane adhesives have the characteristics of solvent-free, pollution-free, good film-forming properties, and strong adhesion. However, polyurethane resin cures slowly, and it is easy to react with water vapor in the air during curing, causing bubbles or even cracks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C08G18/76C08G18/67C08G18/66C08G18/58C08G18/48C08G18/32C08G18/12
CPCC08G18/12C08G18/4045C08G18/6659C08G18/6692C08G18/672C08G18/7628C09J175/08C08G18/3893C08G18/0809
Inventor 姚义俊万韬隃刘斌温晓霞刘雯雯杨佳伟张彬张俊阳
Owner SHANGHAI JINQIANG ADHESIVE
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