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Water-based polyurethane adhesive and preparation method thereof

A water-based polyurethane and adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of low peel strength and low solid content of polyurethane adhesives, and achieve high peel strength , good fluidity and easy access to raw materials

Active Publication Date: 2014-10-08
新纶电子材料(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects in the above-mentioned prior art, the object of the present invention is a water-based polyurethane adhesive and a preparation method thereof, which can solve the problems of low solid content and low peel strength of water-based and environmentally friendly polyurethane adhesives.

Method used

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  • Water-based polyurethane adhesive and preparation method thereof
  • Water-based polyurethane adhesive and preparation method thereof
  • Water-based polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides an aqueous polyurethane adhesive, which includes a prepolymer and water, and the prepolymer includes the following raw materials:

[0052] Polyester diol PBA2k, carboxylic acid type hydrophilic chain extender DMBA, diisocyanate IPDI, small molecule chain extender BDO and TEA, based on the molar ratio, IPDI: PBA: DMBA: BDO: TEA = 35: 10: 7.5:7.5:7.5.

[0053] The water-based polyurethane adhesive of this embodiment is prepared by the following method, such as figure 1 Shown:

[0054] Heat 40gPBA2k to 120℃, dehydrate it for 30min, pour it into a 250ml three-necked flask equipped with a thermometer, reflux condenser and stirrer, keep it at 50℃, and then add 15.5gIPDI and 2.25gDMBA in acetone solution (in molar amount DMBA :Acetone=1:1), heat up to 75°C, stir and react at a constant speed for 3h to obtain the initial polymerization liquid;

[0055] Add 1.35g of BDO to the initial polymerization solution for chain extension and react at 70°C for 1 hour to o...

Embodiment 2

[0059] This embodiment provides an aqueous polyurethane adhesive, which includes a prepolymer and water, and the prepolymer includes the following raw materials:

[0060] Polyester diols PBA2k, PEG2k, carboxylic acid type hydrophilic chain extender DMBA, diisocyanate IPDI, small molecule chain extender BDO and TEA, in molar ratio, IPDI: PEG: PBA: DMBA: BDO: TEA = 35:0.5:9.5:7.5:7.5:7.5.

[0061] The water-based polyurethane adhesive of this embodiment is prepared by the following method, such as figure 1 Shown:

[0062] The 38gPBA2k and 2gPEG2k were heated to 120℃, dehydrated for 30min, poured into a 250ml three-necked flask equipped with a thermometer, reflux condenser and stirrer, kept at 50℃, and then added 15.5gIPDI and 2.25gDMBA in acetone solution (in molar amount Calculate DMBA: acetone=1:1), heat up to 75°C, stir and react at a constant speed for 3h to obtain the primary polymerization liquid;

[0063] Add 1.35g of BDO to the initial polymerization solution for chain extensio...

Embodiment 3

[0067] This embodiment provides an aqueous polyurethane adhesive, which includes a prepolymer and water, and the prepolymer includes the following raw materials:

[0068] Polyester diol PBA2k, PEG, carboxylic acid type hydrophilic chain extender DMBA, diisocyanate IPDI, small molecule chain extender BDO and TEA, in molar ratio, IPDI: PEG: PBA: DMBA: BDO: TEA = 35:1:9:7.5:7.5:7.5.

[0069] The water-based polyurethane adhesive of this embodiment is prepared by the following method, such as figure 1 Shown:

[0070] Heat 36gPBA2k and 4gPEG2k to 120°C, dehydrate for 30min, pour them into a 250ml three-necked flask equipped with thermometer, reflux condenser and stirrer, keep at 50°C, then add 15.5gIPDI and 2.25gDMBA in acetone solution (in molar amount Calculate DMBA: acetone=1:1), heat up to 75°C, stir and react at a constant speed for 3h to obtain the primary polymerization liquid;

[0071] Add 1.35g of BDO to the initial polymerization solution for chain extension and react at 70°C fo...

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Abstract

The invention provides a water-based polyurethane adhesive and a preparation method thereof. The water-based polyurethane adhesive comprises a prepolymer and water, wherein the prepolymer is dispersed into the water to form a solution, solid content of the solution is 50%, the prepolymer is prepared from the following raw materials: polyethylene glycol, polyester dihydric alcohol, carboxylic acid type hydrophilic chain extender, diisocyanate and a micromolecule chain extender, the mole ratio of polyethylene glycol to polyester dihydric alcohol to carboxylic acid type hydrophilic chain extender to diisocyanate to a micromolecule chain extender is (25-40):X:(10-X):(7.5-15):(7.5-15), and X is any numerical value from 0 to 10. The invention also provides a preparation method of the water-based polyurethane adhesive. The prepared water-based polyurethane adhesive has high solid content and good dispersion stability, maintains some good performances of the traditional solvent type polyurethane adhesive and also has the advantages of safety, difficulty in combustion, no pollution to the environment and high peeling strength.

Description

Technical field [0001] The invention relates to an aqueous polyurethane adhesive and a preparation method thereof, and belongs to the technical field of adhesives. Background technique [0002] In the existing technology, most of the polyurethane adhesives developed and produced in China are solvent-based. The use of such solvent-based adhesives has put a lot of pressure on the environment in my country. In order to respond to environmental protection requirements, domestic More and more people are developing excellent waterborne polyurethane adhesives to replace solvent-based adhesives. However, the peel strength of the existing waterborne polyurethane adhesives is generally very low, far from reaching the peel strength of solvent-based adhesives, and cannot meet the requirements of use. [0003] In our country, due to price and raw materials, the polyols used in waterborne polyurethane adhesives are mainly polyether alcohols, and most commonly used polyoxypropylene ether glycols ...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J175/06C08G18/12C08G18/48C08G18/42C08G18/66
Inventor 邓超
Owner 新纶电子材料(常州)有限公司
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