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Method for preparing composite water-based polyurethane

A technology of water-based polyurethane and polyether, which is applied in the fields of wood and clothing, can solve the problems of high price, heavy ammonia smell, and loss of strength, and achieve the effects of excellent washing resistance, convenient use, and waste reduction

Inactive Publication Date: 2010-04-21
江苏光辉粘合科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of oily polyurethane are: 1. It contains solvents, is irritating, and contains harmful substances such as formaldehyde, which brings many problems to some textiles exported to European and American markets; Adhesion
The main disadvantages of latex: 1. The ammonia smell is heavy, and the operator is greatly affected; 2. The water-soluble effect is not good, and the rubber in the latex is easy to age and lose its strength.
However, the price of some water-based polyurethane products in foreign countries is very high, which is not suitable for the domestic textile industry, which is a very competitive industry. Most textile products still use oil-based polyurethane products.

Method used

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  • Method for preparing composite water-based polyurethane
  • Method for preparing composite water-based polyurethane
  • Method for preparing composite water-based polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 100 parts of polyether PPG210, 5 parts of epoxy resin E51, 34.05 parts of toluene diisocyanate TDI-80, 6.08 parts of crude MDI (diphenylmethane diisocyanate), add 0.015 parts of Dibutyltin dilaurate, heated to 78°C, pre-polymerized for two hours; measure the -NCO value 30 minutes in advance, and the -NCO value is determined by the di-n-butylamine chemical method in GB / T1722. After the -NCO value reaches 5.5-6, add 9 parts of dimethylol propionic acid, react for 3.5 hours, and measure the -NCO value again when it is 4.5-5; cool down to 50°C, add 60 parts of acetone, stir and cool down to 40 ℃, discharge material; put it into the dispersion bucket immediately, add 6.78 parts of triethylamine, stir for 5 minutes, add 357 parts of water, disperse at a high speed above 1000 rpm; disperse at high speed for 5 minutes, after the dispersion is uniform, add 1.5 parts of ethylenediamine , continue the chain extension reaction, reduce the speed to 50 rpm, and stir for 2.5 hours...

Embodiment 2

[0029] Put 80 parts of polyether PPG210, 3.5 parts of epoxy resin E51, 30 parts of toluene diisocyanate TDI-80, 4.5 parts of crude MDI (diphenylmethane diisocyanate), add 0.01 parts of Dibutyltin dilaurate, heated to 72°C, pre-polymerized for 1.5 hours; measure the -NCO value 25 minutes in advance, and the -NCO value is determined by the di-n-butylamine chemical method in GB / T1722. After reaching 5.5-6, add 7 parts of dimethylolpropionic acid, react for 2.5 hours, and measure again when the -NCO value is in the range of 4.5-5; cool down to 45°C, add 50 parts of acetone, stir and cool down to 30 ℃, discharge; immediately put into the dispersion bucket, add 5 parts of triethylamine, stir for 4 minutes, add 320 parts of water, disperse at a high speed above 1000 rpm; disperse at high speed for 4 minutes, add 0.7 parts of ethylenediamine after the dispersion is uniform , continue the chain extension reaction, reduce the speed to 30 rpm, and stir for 2 hours; airtight and static fo...

Embodiment 3

[0032] Add 120 parts of polyether PPG210, 8 parts of epoxy resin E51, 40 parts of toluene diisocyanate TDI-80, and 9 parts of crude MDI (diphenylmethane diisocyanate) into the reactor, and add 0.02 parts The dibutyltin dilaurate is heated to 82°C and pre-polymerized for 3 hours; the -NCO value is measured 40 minutes in advance, and the -NCO value is determined by the di-n-butylamine chemical method in GB / T1722. After reaching 5.5-6, add 12 parts of dimethylolpropionic acid, react for 5 hours, and measure the -NCO value again at 4.5-5; cool down to 55°C, add 70 parts of acetone, stir and cool down to 50°C, and release material; put it into the dispersion bucket immediately, add 8 parts of triethylamine, stir for 8 minutes, add 400 parts of water, and disperse at a high speed above 1000 rpm; disperse at a high speed for 7.5 minutes, add 3 parts of ethylenediamine after the dispersion is uniform, and continue to expand Chain reaction, reduce the speed to 40 rpm, stir for 3 hours;...

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Abstract

The invention discloses a method for preparing composite water-based polyurethane. The method comprises the following steps of: adding polyether, epoxy resin, toluene diisocynate and rude MdI into a kettle, then adding a catalyst into the kettle, and preheating and prepolymerizing the mixture; measuring -NCO value, adding dimethylopropionic acid, after reacting the mixture, measuring -NCO value again; reducing the temperature, adding acetone, stirring the mixed solution, discharging the obtained product; placing the obtained product into a dispersion barrel, adding triethylamine into the dispersion barrel, stirring the mixture, adding water, and dispersing the mixed solution at a high speed; after dispersing the mixed solution uniformly, adding ethidene diamine, performing a chain extending reaction, and then stirring the obtained solution at a reduced speed; sealing and standing the obtained solution, then filtering the obtained solution and discharging the filter. The method overcomes the shortage of short-time use after the mixing of two components because the conventional oil polyurethane uses an irritant solvent, reduces waste and protects environment, has the advantages of non-toxicity and light smell by taking water as a solvent, and makes an adhesive achieve the adhesive strength by heating and activating the adhesive when clothes are bonded so as to achieve effect of good hand feeling after bonding and good water washing property.

Description

technical field [0001] The invention relates to a preparation method of an adhesive, in particular to a preparation method of water-based polyurethane, which is mainly used in the fields of clothing, wood and the like. Background technique [0002] Polyurethane (English Polyurethane, referred to as PU) adhesive refers to an adhesive containing a urethane group (-NHCOO-) or an isocyanate group (-N=C=O) in the molecular chain, because it contains two strong polar It has excellent adhesion to wood, leather, fabric, ceramics, glass, metal, rubber, etc. [0003] Currently, oily (two-component) polyurethane and latex adhesives are mainly used in the clothing industry. The main disadvantages of oily polyurethane are: 1. It contains solvents, is irritating, and contains harmful substances such as formaldehyde, which brings many problems to some textiles exported to European and American markets; Adhesion. The main disadvantages of latex: 1. The ammonia smell is heavy, and the ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/48C08G18/58C08G18/32C09J175/12
Inventor 陈志峰冯芳丹丁逸峰
Owner 江苏光辉粘合科技有限公司
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