Bicompenent high solid content aqueous polyurethane, its preparation method and application

A water-based polyurethane, high solid content technology, used in polyurea/polyurethane adhesives, adhesive types, textiles and papermaking, etc., can solve the problems of high product viscosity, difficult dispersion, poor hydrophilicity, etc. Less dosage, simple process, good water resistance

Inactive Publication Date: 2006-06-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] U.S. Patent USP.4,443,095 prepared a water-dispersed aromatic polyisocyanate crosslinking agent, the principle of which is to use isocyanic acid functional groups and polyethylene glycol monoalkyl ethers to carry out chemical reactions to maintain its hydrophilicity. The above disadvantages are hydrophilic Poor water, and due to the high activity of aromatic isocyanate, it reacts quickly with water and is unstable in water. Moreover, because the patent uses higher molecular weight polyethylene glycol monoalkyl ether, the modified polyisocyanate is solid. cause difficulty in using
Although U.S. Patent USP.5,200,489 uses low molecular weight polyethylene glycol monoalkyl ether to modify aliphatic polyisocyanate, its product viscosity is relatively large, and it is difficult to disperse in water

Method used

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  • Bicompenent high solid content aqueous polyurethane, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] raw material:

[0067] 1000.0g polyester diol (prepared by adipic acid, 1,4-butanediol, molecular weight 3000)

[0068] 32.9 Dimethylolpropionic acid (DMPA)

[0069] 24.8g triethylamine (TEA)

[0070] 65.7g hexamethylene diisocyanate (HDI)

[0071] 86.8g isophorone diisocyanate (IPDI)

[0072] 8.5g ethylenediamine (EDA)

[0073] 0.3g dibutyltin dilaurate

[0074] 400g acetone

[0075] 1210.0g deionized water

[0076] Preparation method: In a glass reactor equipped with an electric stirrer, a reflux condenser, and a thermocouple thermometer, add polyester diol and DMPA, and melt at 90-100°C. Then lower the temperature to about 70°C, add IPDI and HDI, dropwise add 0.3g of dibutyltin dilaurate catalyst, and in the presence of 400g of acetone, stir and react at 70°C for 5 hours to obtain a prepolymer. Cool the prepolymer to 50°C, add TEA to neutralize and form a salt. Disperse the prepolymer obtained after neutralization into a deionized medium under high-speed she...

Embodiment 2

[0078] raw material:

[0079] 1000.0g polyester diol (prepared by adipic acid, 1,4-butanediol, molecular weight 3000)

[0080] 45.0g 1,4-butanediol (BDO)

[0081] 37.9g ​​dimethylolpropionic acid (DMPA)

[0082] 28.6g triethylamine (TEA)

[0083] 456.3.0g isophorone diisocyanate (IPDI)

[0084] 33.4g Ethylenediamine (EDA)

[0085] 0.3g dibutyltin dilaurate

[0086] 400.0g acetone

[0087] 1600.0g deionized water

[0088]In a glass reactor equipped with an electric stirrer, a reflux condenser, and a thermocouple thermometer, add polyester diol, BDO, and DMPA. After melting at 90-100°C, cool down to about 70°C and add IPDI, dropwise 0.3 g of dibutyltin dilaurate catalyst, in the presence of 400 g of acetone, stirred and reacted at 70° C. for 4 hours to obtain a prepolymer. After the temperature of the prepolymer is lowered to 50°C, TEA is added to neutralize and form a salt. Disperse the prepolymer obtained after neutralization into a deionized medium for emulsification...

Embodiment 3

[0090] raw material:

[0091] 1000.0g polyester diol (prepared by adipic acid, 1,4-butanediol, molecular weight 1000)

[0092] 42.1g dimethylolpropionic acid (DMPA)

[0093] 31.4g triethylamine (TEA)

[0094] 107.0g hexamethylene diisocyanate (HDI)

[0095] 329.9g isophorone diisocyanate (IPDI)

[0096] 34.0g ethylenediamine (EDA)

[0097] 0.3g dibutyltin dilaurate

[0098] 450.0g acetone

[0099] 1550.0g deionized water

[0100] Preparation method: See Example 1 to obtain a stable milky white water-based polyurethane dispersion with the following properties: solid content: 51.5%; pH: 6.9; viscosity: 475 mPa.s.

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Abstract

The present invention relates to double-component high solid content water-based polyurethane, its preparation method and application. Said method includes the following procedures: preparing water-dispersible polyurethane adhesive; preparing water-dispersivity polyisocynate cross-linking agent; and before application mixing the water-dispersible polyurethane adhesive and water-dispersivity polyisocynate cross-linking agent, in which the preparation of polyurethane adhesive includes the preparation of prepolymer, the prepolymer is neutralized and dispersed into the deioniced water to obtain dispersion, then the dispersion is chain-extended so as to form water-based polyurethane.

Description

technical field [0001] The invention relates to the field of fine polymer materials. In particular, a two-component high-solid-content water-based polyurethane based on a high-solid-content water-based polyurethane as a main agent and a water-dispersible polyisocyanate as a cross-linking agent and its preparation method and application. Background technique [0002] Water-based polyurethane uses water as the dispersion medium. It has the advantages of no pollution, environmental friendliness, safe storage and transportation, no fire hazards, and resource saving. It is widely used in fabric coating, leather edge oil, adhesives and other fields. In recent years, the research on waterborne polyurethane has been relatively active, but the solid content of the prepared waterborne polyurethane is generally below 40%, and the waterborne polyurethane with low solid content has problems such as slow volatilization speed, many times of gluing, and high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08G18/10C08G18/42C08G18/83C08J3/24C08K5/29C09J175/04D06M15/564
Inventor 孙东成黎庆安
Owner SOUTH CHINA UNIV OF TECH
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