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Preparation method of monocomponent polyurethane flocking adhesive

A polyurethane and flocking adhesive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, epoxy resin adhesives, etc., can solve the problems of replacing brushes, poor opening stability, etc., to achieve good adhesion, fast curing performance, The effect of excellent wear and water resistance

Active Publication Date: 2013-09-04
云南三恩汽车新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing flocking adhesive products on the surface of EPDM are mainly moisture-cured types, which have problems such as poor opening stability and frequent replacement of brushes, which bring many problems to the continuous operation of the production line

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In advance, polycarbonate diol with a molecular weight of 2000 and polyoxypropylene polyol with a molecular weight of 2000 were dehydrated at 100°C and a vacuum of 0.09MPa for 2 hours, and 40g of polycarbonate diol and 40g of polyol were taken. Propylene polyol is oxidized to obtain 80 grams of mixture; 20 g of liquefied diphenylmethane diisocyanate (MDI) and 20 g of toluene diisocyanate of mixture A, dehydrated mixture B, 8 g of 200 g / eq (gram / eq) Add epoxy resin C, 1g dibutyltin dilaurate and 1g dimorpholine diethyl ether catalyst D, 70g xylene and 70g cyclohexanone mixed solvent E into a three-necked flask, and react at 70°C for 5 hours to prepare The obtained solid content is 48%, and the isocyanate content is about 5% polyurethane prepolymer solution.

[0025] Then add 31g of butanone oxime blocking agent F, and react at 60°C for 2 hours, so that the final isocyanate content is 0.1%.

[0026] Then control the temperature at 20°C, add 15g of small molecule chain ex...

Embodiment 2

[0028] Get the polybutylene adipate diol 40g that the molecular weight of dehydration treatment is 2000, get the polyethylene glycol 40g that the molecular weight of dehydration treatment is 3000, obtain mixture B80 grams, dehydration treatment method is with reference to above-mentioned embodiment 1 ; With the mixture A of 20g isophorone diisocyanate and 20g toluene diisocyanate, the mixture B after dehydration, 10g redox equivalent is the epoxy resin C of 180g / eq, 1g stannous octoate and 1gN-methylmorpholine D , 75g of xylene and 75g of propylene glycol methyl ether acetate mixed solvent E were added to a three-necked flask, and reacted at 70°C for 5 hours to obtain a polyurethane prepolymer solution with a solid content of about 50% and an isocyanate content of about 4%. .

[0029] Then add 40g of phenol blocking agent F and react at 70°C for 2 hours to make the final isocyanate content less than 0.1%.

[0030] Then control the temperature at 20°C, add 20g of the complex G...

Embodiment 3

[0032] Get 40g of phthalic anhydride polyester polyol 40g with a number-average molecular weight of 2000g / mol and polytetrahydrofuran diol with a molecular weight of 2000g / mol through dehydration to obtain 80 grams of mixture B. The dehydration treatment method is referred to Example 1; Mixture A of ketone diisocyanate and 20g of polymeric diphenylmethane diisocyanate (polymeric MDI), mixture B after dehydration, 10g of epoxy resin C with a redox equivalent of 500g / eq, 1g of dibutyltin diacetate and 1g of bicyclic amidine catalyst D. Add solvent E mixed with 80g xylene and 80g propylene glycol methyl ether acetate into a three-necked flask, and react at 70°C for 5 hours to obtain a polyurethane prepolymer solution with a solid content of about 45% and an isocyanate content of 4.5%.

[0033] Then add 30g of caprolactam blocking agent F and react at 70°C for 2 hours to make the final isocyanate content less than 0.1%.

[0034] Then control the temperature at room temperature, ad...

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Abstract

The invention discloses a preparation method of a monocomponent polyurethane flocking adhesive. The preparation method comprises the following sequential steps of: a. reacting isocyanate or isocyanate mixture A, mixture B of polyester polyol and polyether polyol containing at least two hydroxy groups, epoxy resin C, organic tin and organic amine catalysts D and a solvent E at the temperature of 60-120 DEG C for 1-6 hours to obtain polyurethane prepolymer; b. cooling to 40-60 DEG C, adding an isocyanate sealant F, and reacting for 1-4 hours; and c. controlling the temperature at 20-40 DEG C, and adding a low-molecular-weight chain extender G and an adhesion accelerant H. The polyurethane sol prepared by the method has the advantages of good adhesion to a rubber base material, excellent wear resistance and water resistance, and good opened standing performance and rapid curing performance.

Description

technical field [0001] The invention relates to a preparation method of flocking glue, in particular to a preparation method of one-component polyurethane flocking glue. Background technique [0002] The fiber powder is vertically fixed on the object or substrate coated with adhesive. This method of fixing short fibers is called flocking. The flocking methods used in the industry mainly include mechanical and electrostatic methods. At present, electrostatic flocking is the main method. At present, most of the automobile sealing strips are made of EPDM (ethylene propylene diene monomer), PVC (polyvinyl chloride), TPV (thermoplastic vulcanizate) and other materials. After the surface is flocked, it can reduce the lifting resistance of the glass window and reduce the vehicle Effects of noise during operation. The existing flocking adhesive products on the surface of EPDM are mainly moisture-cured types, which have problems such as poor opening stability and frequent replaceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J175/08C09J163/02C09J11/08C08G18/80C08G18/12
Inventor 唐邓顾真贵
Owner 云南三恩汽车新材料有限公司
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