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Method for preparing modified aqueous adhesion agent of polyurethane

A water-based polyurethane and adhesive technology, which is applied in the field of preparation of modified water-based adhesives, can solve the problems of theoretical or applied research lag, poor high temperature resistance, and low cohesive strength, and achieve easy promotion, good chemical resistance, and improved cohesion The effect of intensity

Inactive Publication Date: 2009-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the performance of water-based polyurethane adhesives studied in my country can not meet the needs of various materials, mainly manifested in low cohesive strength, slow drying speed, and poor high temperature resistance. Both theoretical and applied research are very lagging behind, and the output is very small. The variety is single, which is far from meeting the growing demand of the domestic market for this kind of high-quality environmentally friendly adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 5g of E-12 into the reaction equipment with stirrer, thermometer and condenser, add 0.25g of modifier phosphoric acid, and react at 120°C for 2h to obtain a modified epoxy resin; mix 100g of TDI, 140g of Polyoxypropylene diol was reacted at 60°C for 2 hours, then 6g of ethylene glycol and 20g of dimethylol propionic acid were added, and reacted for 5 hours to obtain a polyurethane prepolymer; the above-mentioned modified epoxy resin was added to the prepolymer, React with the prepolymer for 2 hours to obtain epoxy resin-modified polyurethane prepolymer, then lower the temperature to 40°C, and finally add 18gTEA to neutralize and emulsify for 5min, add water to disperse at 2000r / min for 5min, and add 3g of EDA aqueous solution to carry out Chain extension to obtain modified water-based polyurethane adhesive. The performance of this product is compared with that of a foreign company in Table 1.

[0026] As shown in Table 1, the rotational viscosity, film tensile stre...

Embodiment 2

[0030] Add 12.8g of E-20 into the reaction equipment with stirrer, thermometer and condenser, add modifier phosphoric acid 1.28g, react at 150°C for 3h to make epoxy resin; Add ethylene glycol ester diol and 85g HDI into the dry reaction equipment equipped with a thermometer, agitator and condenser, react at 80°C for 3h, then add 10g neopentyl glycol, 14g maleic anhydride, react for 2h, During the reaction process, add acetone depending on the viscosity to obtain a polyurethane prepolymer; add the above-mentioned modified epoxy resin to the prepolymer, and react for 3 hours to obtain an epoxy resin-modified polyurethane prepolymer, and then lower the temperature to 45°C , add 10g of ammonia water, neutralize for 10min, add water at 3000r / min, disperse for 20min, add 8g of ethylene glycol diglycidyl ether aqueous solution for chain extension, and obtain a modified polyurethane adhesive. The performance comparison of this product with that of a foreign company is shown in Table ...

Embodiment 3

[0035] Add 2g of E-51 into the reaction equipment with stirrer, thermometer and condenser, add 0.15g of modifier acetic acid, and react at 135°C for 2.5h to obtain a modified epoxy resin; 20g of IPDI and 100g of polytetrahydrofuran diol React at 70°C for 2.5h, then add 20g of ethylene glycol, 21g of dimethylolpropionic acid, and react for 4h to obtain a polyurethane prepolymer; add the above-mentioned modified epoxy resin to the prepolymer, and combine with the prepolymer React for 2.5 hours to obtain epoxy resin-modified polyurethane prepolymer, then lower the temperature to 40°C, add 6g NaOH to neutralize for 10 minutes, add water to disperse at 2500r / min for 3 minutes, and then add 5g of N-methyldiethanolamine aqueous solution Carry out chain extension to obtain a modified water-based polyurethane adhesive. The performance comparison of this product with that of a foreign company is shown in Table 3.

[0036] table 3

[0037] Quality Index Products of a foreign c...

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PUM

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Abstract

This invention discloses a method for preparing modified aqueous polyurethane adhesive. The method comprises: (1) modifying epoxy resin with modifier to obtain modified epoxy resin; (2) reacting polyisocyanate with polyester or polyol polyether, and adding chain extender to obtain polyurethane with prepolymer; (3) modifying polyurethane prepolymer with modified epoxy resin to obtain modified polyurethane prepolymer; (4) adding water, dispersing by a high-speed disperser, and adding neutralizer and crosslinking agent to obtain modified aqueous polyurethane adhesive. This invention introduces epoxy resin into the modification of aqueous polyurethane adhesive, thus combines high modulus, high strength and good chemical resistance of epoxy resin with the advantages of polyurethane resin. The modified aqueous polyurethane adhesive can meet the needs of automobile inner decoration materials. The method has such advantages as simple process, and low cost.

Description

technical field [0001] The invention relates to a preparation method of a modified water-based adhesive that can be used in the fields of automotive interior materials, wood, packaging films, fibers, leather, etc., specifically involves the use of a modified epoxy resin to modify polyurethane to obtain A preparation method of a modified water-based polyurethane adhesive. Background technique [0002] The voice of public opinion to protect the ecological environment is increasing day by day, and some developed countries have enacted fire protection regulations and solvent regulations one after another, limiting the use of solvent-based adhesives, which makes the development of water-based adhesives an inevitable trend. At present, in my country's water-based adhesives, "trialdehyde resin" glue, polyvinyl acetate glue and acrylic resin glue are the main ones. "Trialdehyde resin" glue will produce pungent smell and toxic formaldehyde during use, which will pollute the environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C08G18/83C08G18/10
Inventor 傅和青黄洪张心亚陈焕钦
Owner SOUTH CHINA UNIV OF TECH