Method for preparing multiple modified self-crosslinking aqueous polyurethane adhesive agent

A water-based polyurethane and adhesive technology, applied in the direction of adhesives, etc., can solve the problems of lag in theoretical or applied research, low cohesive strength, poor high temperature resistance, etc., and achieve the effect of easy promotion and application, improved initial adhesion, and fast drying speed.

Inactive Publication Date: 2008-05-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the performance of domestic water-based polyurethane adhesives cannot 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 small and the variety is single. , far from meeting the domestic market's growing demand for this high-quality, environmentally-friendly adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] React 100g HDI and 384g polyoxypropylene diol with a molecular weight of 2000 at 80°C for 3h, then add 15g of dimethylol propionic acid, and react for 2h to obtain a polyurethane prepolymer; mix 10g of rosin glyceride and 5g of E-20 epoxy The resin was added to the prepolymer, reacted with the prepolymer for 3 hours to obtain a polyurethane prepolymer modified by rosin glyceride and epoxy resin, then cooled to 35°C, and finally added 9.6g triethylamine for neutralization for 10min, and then Add 1115g of water at 2500r / min, disperse for 10min, and add 1.7g of ethylenediamine crosslinking agent to obtain a modified waterborne polyurethane dispersion.

[0030] Take 100 g of the above-mentioned modified water-based polyurethane dispersion, add 0.1 g of thickener WZA-120 and 0.1 g of defoamer ATF-1 to the dispersion to obtain a modified water-based polyurethane adhesive.

[0031] The performance of this product is compared with that of a foreign company in Table 1.

[0032]...

Embodiment 2

[0036] Add 100g of TDI, 370g of polyethylene adipate diol to the dry reaction equipment equipped with thermometer, stirrer and condenser, react at 70°C for 2.5h and then add 27g of dimethylolacetic acid , react for 2h, add acetone depending on the viscosity of the reaction process to obtain a polyurethane prepolymer; add 20g rosin maleic anhydride ester and 10g E-44 epoxy resin to the prepolymer, react for 2.5h to obtain rosin glycerin Ester and epoxy resin modified polyurethane prepolymer, then lower the temperature to 40°C, add 32.7g triethanolamine, neutralize for 15min, add 850g water at 4000r / min, disperse for 30min, add 3.6g butanediamine for crosslinking agent to obtain a modified aqueous polyurethane dispersion.

[0037] 100g of the above-mentioned modified waterborne polyurethane dispersion was added to the dispersion with 0.5g of thickener WZA-120 and 0.3g of defoamer ATF-2 to obtain a modified waterborne polyurethane adhesive.

[0038] Modified polyurethane adhesiv...

Embodiment 3

[0043] 100g IPDI and 349g polycaprolactone diol were reacted at 70°C for 2.5h, then 20g dimethylol butyric acid was added, and the reaction was 2h to obtain a polyurethane prepolymer; 15g rosin maleic anhydride ester and 8g E-51 ring Oxygen resin was added to the prepolymer and reacted with the prepolymer for 2.5h to obtain a polyurethane prepolymer modified by epoxy resin and rosin. Then, the temperature was lowered to 38°C, and 12.5g of triethylamine was added for neutralization for 10min. Add 938g of water per minute to disperse for 15min, and then add 2.9g of crosslinking agent ethylenediamine to obtain a modified waterborne polyurethane dispersion.

[0044] Add 0.3 g thickener WZA-121 and 0.2 g defoamer ATF-2 to 100 g of the above-mentioned modified water-based polyurethane 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.

[0045] table 3

[0046] Quality Index...

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Abstract

The invention discloses a preparation method of self cross-linking water-based polyurethane adhesive of multiple modifications. Polyisocyanate and oligomer polyol are added into a reaction device for reaction; then chain extender is added for reaction to prepare polyurethane prepolymer; then polyurethane prepolymer modified by rosin and epoxy resin is added to prepare modified polyurethane prepolymer; finally water is added into the modified polyurethane prepolymer and a high-speed disperser is used for dispersion; neutralizer and cross-linker are added to prepare the self cross-linking water-based polyurethane dispersoid of multiple modifications; thickening agent and defoamer are added into the dispersoid to prepare the modified polyurethane adhesive. The adhesive prepared in the invention has the rapid drying, good water resistance and high bond strength; the adhesive can meet the bonding requirements of vehicles and a plurality of other materials; the invention has the advantages of simple operation, simple process, short production cycle, low cost of operation and easiness of promotion and application.

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 automobiles, furniture, wood, packaging materials, fibers, leather, etc., in particular to a preparation method of a multiple-modified self-crosslinking water-based polyurethane adhesive. Background technique [0002] Solvent-based adhesives cause serious environmental pollution due to their high content of volatile organic compounds (VOC). The voice of public opinion to protect the ecological environment is increasing day by day, and some developed countries have enacted fire regulations and solvent regulations one after another, restricting the use of solvent-based adhesives. With the improvement of my country's environmental protection regulations and the enhancement of people's awareness of environmental protection, environmentally friendly adhesives with good quality, no pollution, and in line with international standards will replace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J9/00
Inventor 傅和青夏正斌黄洪沈慧芳陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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