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Preparation method of high-temperature anti-yellowing polyurethane adhesive size

A polyurethane adhesive, anti-yellowing technology, applied in the field of adhesives, can solve the problems of increasing production costs, discounting adhesive performance, loss of reactivity and reactivity, etc., and achieves the effect of low production cost and good adhesive performance

Inactive Publication Date: 2013-11-27
张明利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, polyurethane adhesives used in the market are very extensive, but there are many shortcomings. Common two-component polyurethane adhesives should not be heated and cured at too high a temperature. Curing at low temperature will make the isocyanate-based curing agent of the adhesive incompletely cross-linked, thereby greatly reducing the performance of the adhesive, and the isocyanate group of the isocyanate-based curing agent is easily separated from the air during curing at 60°C to 80°C. The moisture in the reaction reacts, making it lose reactivity and reactivity, reducing the performance of the adhesive and increasing the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: 200g dimethylformamide is dropped in the reaction vessel, then the polyoxypropylene diol that 100g molecular weight is 2000 is dropped in the reaction vessel, the stirrer of starting reaction vessel, then toluene diisocyanate and Add 40g of the mixture of isophorone diisocyanate, raise the temperature to about 60°C under the protection of nitrogen, add 1-2 drops (about 0.5-1g) of organic Bi catalyst to react for 2h, then add 10g of chain extender ethylene glycol and then Under the protection of nitrogen, raise the temperature to 70°C-85°C, react for 3 hours to obtain a polyurethane prepolymer, add about 150 grams of dimethylformamide to adjust the solid content to 30%±1, and cool the prepolymer to about 60°C 1. Add 0.75 g of high temperature and anti-aging agent to the polyurethane prepolymer, stir for 10 to 20 minutes, then cool down and discharge.

Embodiment 2

[0020] Embodiment 2. 200g dimethylformamide is dropped in the reaction vessel, then the polyester diol that 100g molecular weight is 1500 is dropped in the reaction vessel, the stirrer of starting reaction vessel, then toluene diisocyanate and six Add 35g of methylene diisocyanate mixture, raise the temperature to about 60°C under the protection of nitrogen, add 1-2 drops (about 0.5-1g) of organic Bi catalyst to react for 2h, then add chain extender 1.4-butanediol 13.06 g and then heated up to 70°C to 85°C under the protection of nitrogen, reacted for 3 hours to obtain a polyurethane prepolymer, added about 145.5 grams of dimethylformamide to adjust the solid content to 30% ± 1, and cooled the prepolymer to 60 At about ℃, add 0.75g of high temperature and anti-aging agent to the polyurethane prepolymer, stir for 10 to 20 minutes, then cool down and discharge.

Embodiment 3

[0021] Embodiment 3. 200g dimethyl formamide is dropped in the reaction vessel, then the polyester diol that 100g molecular weight is 1500 is dropped in the reaction vessel, the stirrer of starting reaction vessel, then toluene diisocyanate and six Add 35g of methylene diisocyanate mixture, raise the temperature to about 60°C under the protection of nitrogen, add 1-2 drops (about 0.5-1g) of organic Bi catalyst to react for 2h, then add 9g of chain extender ethylene glycol and Under the protection of nitrogen, raise the temperature to 70°C-85°C, react for 3 hours to obtain a polyurethane prepolymer, add about 136 grams of dimethylformamide to adjust the solid content to 30%±1, and cool the prepolymer to about 60°C. Add 0.75 g of high temperature and anti-aging agent to the polyurethane prepolymer, stir for 10 to 20 minutes, then cool down and discharge.

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PUM

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Abstract

The invention relates to a preparation method of a high-temperature anti-yellowing polyurethane adhesive size, which belongs to the technical field of adhesive sizes. The preparation method comprises the following steps of: firstly adding solvent in to reaction equipment; then adding two or more different types of polyisocyanates and polyols oligomer; heating to be 55-65 DEG C under the protection of nitrogen; adding organic bismuth catalyst to react for 1-3h; then adding chain extenders, heating to be 70-85 DEG C under the protection of the nitrogen, and reacting for 2-3h to obtain a polyurethane prepolymer; adding solvent to regulate the prepolymer to achieve expectant solid content; and simultaneously, cooling the prepolymer to be 55-65 DEG C, adding heat-resistant and antiaging agent being 0.5 percent of the total of the polyurethane prepolymer into the polyurethane prepolymer, and stirring for 10-20min to discharge, wherein the mass ratio of the solvent, the polyisocyanates, the polyols oligomer, the chain extenders and the organic bismuth catalyst is 200-500:30-40:100:5-15:0.01-0.02. Compared with the prior art, the preparation method of the high-temperature anti-yellowing polyurethane adhesive size has the characteristics of anti-yellowing property, good adhesion property, low production cost and the like.

Description

Technical field: [0001] The invention relates to a preparation method of a high-temperature anti-yellowing polyurethane adhesive slurry, which belongs to the technical field of adhesives. technical background: [0002] Polyurethane is mainly a high polymer polymerized by diisocyanate and other polyisocyanates and low molecular weight diols. Due to the strong polar carbamate groups and the presence of hydrogen bonds between macromolecules, polyurethane materials have high Strength, wear resistance, solvent resistance, aging resistance, water resistance and other characteristics. In addition, by changing the type of polyisocyanate and changing the structure and molecular weight of polyols, the properties of polyurethane materials can be changed in a wide range. Now polyurethane materials are widely used in synthetic leather, genuine leather, packaging materials, synthetic fibers, product bonding and other fields. [0003] At present, polyurethane adhesives used in the market...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J175/06C09J175/08C08G18/66C08G18/42C08G18/48
Inventor 张明利
Owner 张明利