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Waterborne epoxy polyurethane veneering adhesive and preparation method thereof

A technology of epoxy polyurethane and adhesive, which is applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., and can solve the problems of failing to meet the requirements of veneer adhesives and low solid content , to achieve the effects of peel strength, environmental friendliness, high solid content, and broad market prospects

Inactive Publication Date: 2020-03-20
SHANDONG TIANQING TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to various reasons such as low solid content, the current water-based epoxy polyurethane cannot meet the requirements of veneer adhesives, so there is an urgent need for an environmentally friendly water-based polyurethane veneer adhesive with higher performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of preparation method of water-based epoxy polyurethane veneer adhesive, is characterized in that: comprise the steps:

[0041] Step 1: Add 288kg of polytetrahydrofuran ether into the reactor, seal and draw a vacuum, and dehydrate the polytetrahydrofuran ether under the conditions of negative pressure of -0.08MPa and temperature of 110°C, and the dehydration time is 1.5h;

[0042] Step 2: After the dehydration of polytetrahydrofuran ether is completed, transfer it to the prepolymerization reactor, lower the temperature to below 70°C, extract 72kg of toluene diisocyanate, 6kg of epoxy resin, and then add 1kg of antioxidant, and start timing when the temperature rises to 85°C. One-step prepolymerization reaction, the reaction time is 2h;

[0043] Step 3: After the first step of prepolymerization is completed, cool down to 60°C, put in 8kg of neopentyl glycol, 12kg of dimethylol butyrate and 30g of stannous octoate, add 40kg of acetone, and heat up to 75°C for the sec...

Embodiment 2

[0051] A kind of preparation method of water-based epoxy polyurethane veneer adhesive, comprises the steps:

[0052] Step 1: Add 260kg of polytetrahydrofuran ether and 39kg of polypropylene glycol into the reactor, seal and draw a vacuum, and dehydrate the polytetrahydrofuran ether under the conditions of negative pressure of -0.08MPa and temperature of 110°C, and the dehydration time is 1.5h;

[0053] Step 2: After the dehydration of polytetrahydrofuran ether and polypropylene glycol is completed, cool down to 70°C, extract 70kg of toluene diisocyanate, 3kg of epoxy resin, and then add 2kg of antioxidants, heat up to 85°C and start timing for the first step of prepolymerization reaction. time 2h;

[0054] Step 3: After the first step of prepolymerization is completed, cool down to 60°C, put in 12kg of dimethylolbutyric acid and 40g of stannous octoate, add 20kg of acetone, heat up to 75°C for the second step of chain extension prepolymerization, and react 3h;

[0055] Step ...

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Abstract

The invention discloses a waterborne epoxy polyurethane veneering adhesive and a preparation method thereof, belonging to the technical field of environmental protection and ecological tanning. The waterborne epoxy polyurethane veneering adhesive comprises the following substances in parts by weight: 260-280 parts of polytetrahydrofuran ethe, 0-36 parts of polypropylene glycol, 70-72 parts of toluene diisocynate, 3-6 parts of epoxy resin, 1-2 parts of an antioxidant, 0-8 parts of neopentyl glycol, 12 parts of dimethylolbutyric acid, 0.03-0.04 part of stannous octoate, 40 parts of acetone, 6.5-7 parts of N,N-dimethylethanolamine and 350-450 parts of deionized water. The waterborne epoxy polyurethane veneering adhesive prepared by the invention has the characteristics of high solid content,high peel strength and environmental friendliness; in addition, the waterborne epoxy polyurethane veneering adhesive prepared by the preparation method disclosed by the invention is relatively long ininitial adhesion retention time at a low temperature, relatively sufficient in operable time reserved for a field process, has the characteristics of easiness in drying and high adhesion during high-temperature baking, can be widely applied to genuine leather and microfiber synthetic leather, and has wide market prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and ecological tanning, in particular to a water-based epoxy polyurethane veneer adhesive and a preparation method thereof. Background technique [0002] The post-processing section of genuine leather tanneries and microfiber synthetic leather factories generally uses veneering technology. At present, the most used process is solvent-based veneering process. First, the solvent-based surface is formed on the release paper, and then the solvent-based veneer is used. Adhesives bond the base fabric to the surface. More dimethylformamide (DMF) is used in the solvent-based veneer process, and the country has strictly limited the amount of use, forcing leather tanneries and microfiber synthetic leather factories to upgrade and transform their processes. However, due to various reasons such as low solid content, the current water-based epoxy polyurethane cannot meet the requirements of v...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/58C08G18/34C08G18/32C09J175/08
CPCC08G18/3206C08G18/3271C08G18/348C08G18/4045C08G18/4854C08G18/58C08G18/6692C09J175/08
Inventor 徐旭东陈玉国宁继鑫刘娅林张留成郭翠娟陈建栋郑萍赵继光高云峰
Owner SHANDONG TIANQING TECH DEV