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Method for preparing polyurethane adhesive by modifying waste polyurethane recovery product by using montmorillonite

A polyurethane adhesive, polyurethane technology, applied in polyurea/polyurethane adhesive, adhesive, plastic recycling, etc., can solve the problem of poor compatibility between montmorillonite and polyurethane, poor dispersion of organic montmorillonite, polyurethane adhesive The performance of the adhesive is not large, and the effect of improving the mechanical strength and heat resistance, low cost and stable properties is achieved.

Active Publication Date: 2015-06-10
SHANGHAI HECHENG POLYMER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mention of the re-modification of the degraded product in the field of adhesives. The patent (application number 201410118997.0) mentions the preparation method of montmorillonite-modified alcohol-soluble polyurethane adhesives. The distance between soil layers is removed, so that the dispersion of organic montmorillonite in polyurethane is not good, so as to improve the performance of polyurethane adhesive, its mechanical strength and heat resistance are poor, and its water absorption rate and air permeability are limited.
[0005] However, since the modification method mentioned in the above-mentioned patent is one-time modification and the modifying agent only enlarges the interlayer spacing of montmorillonite, but the side hydroxyl groups of montmorillonite sheets have not been effectively modified, therefore The compatibility between montmorillonite and polyurethane is poor, and secondary modification is required

Method used

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  • Method for preparing polyurethane adhesive by modifying waste polyurethane recovery product by using montmorillonite
  • Method for preparing polyurethane adhesive by modifying waste polyurethane recovery product by using montmorillonite
  • Method for preparing polyurethane adhesive by modifying waste polyurethane recovery product by using montmorillonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a three-necked round-bottomed flask equipped with a stirrer, a condenser and a thermometer, 10g of waste polyurethane elastomer with a particle size of 10mm after being crushed at a low temperature of -10°C, 10g of 1,4-butanediol, and 0.5g of KOH were added while stirring. The reaction mixture was heated to 160° C. and kept at this temperature for 3 h, the polyurethane elastomer was completely dissolved, and the product was light brown. After washing with water, suction filtration, and water removal, 14 g of regenerated polyols with a molecular weight of 4600 and a hydroxyl value of 500 mgKOH / g were obtained.

[0034] Add 5g of organic montmorillonite nanoparticles to 90g of water with mechanical stirring to form a stable suspension, add 5g of tetradecyltriphenylphosphine bromide, heat to 80°C in a water bath for 5h, wash and dry to obtain a modified montmorillonite . Dissolve 5g of primary modified montmorillonite in acetone, then raise the temperature of the syste...

Embodiment 2

[0038] Add 5g of organic montmorillonite nanoparticles into 90g of water with mechanical stirring to form a stable suspension, add 5g of cetyltriphenylphosphine bromide, heat to 80°C in a water bath for 5h, wash and dry to obtain a modified montmorillonite . Dissolve 5g of primary modified montmorillonite in acetone, then raise the temperature of the system to 80°C, add 5g of 2,4-diphenylmethane diisocyanate as a secondary modifier, react for 3h, and use the prepared montmorillonite The samples were washed three times with acetone again and then dried under vacuum at 100°C to obtain secondary modified montmorillonite.

[0039] 8 g of the polyol obtained after degradation in Example 1 was heated to 105° C. and vacuumed for 1.5 h to remove moisture, 2 g of 2,4-diphenylmethane diisocyanate was added, and 0.15 g of the above-mentioned secondary modified montmorillonite was added, and the mixture was heated to 65° C. The reaction was carried out for 3h; 1.05g of dried dimethylolpr...

Embodiment 3

[0042] Add 5g of organic montmorillonite nanoparticles to 90g of water with mechanical stirring to form a stable suspension, add 5g of tetradecyltriphenylphosphine bromide, heat to 80°C in a water bath for 5h, wash and dry to obtain a modified montmorillonite . Dissolve 5g of primary modified montmorillonite in acetone, then raise the temperature of the system to 80°C, add 5g of 2,4-toluene diisocyanate as secondary modifier, react for 3h, and use the prepared montmorillonite sample again with Washed with acetone three times and then dried in vacuum at 100°C to obtain secondary modified montmorillonite.

[0043] 4 g of the polyol obtained after the degradation of Example 1 was heated to 105°C and vacuumed for 1.5 h to remove moisture, 2 g of 2,4-diphenylmethane diisocyanate was added, 0.15 g of the above-mentioned secondary modified montmorillonite was added, and the reaction was carried out at 65°C. 3h; add 1.05g of dried dimethylolpropionic acid under constant stirring, rea...

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Abstract

The invention relates to a method for preparing polyurethane adhesive by using waste polyuret0hane recovery product by using montmorillonite. The method comprises the following steps: (1) using the waste polyurethane elastomer as a raw material, adding an alcoholysis agent and an auxiliary alcoholysis agent, degrading the waste to obtain regenerated polyol by heating and under a certain of reducing atmosphere condition; (2) secondarily modifying the montmorillonite; (3) adding auxiliary and the secondarily modified montmorillonite in the regenerated polyol to obtain the polyurethane adhesive. The regenerated polyol obtained through the invention is stable in property, uniform in molecular weight, and small in viscosity number, and a hydroxyl value meets the use requirement of the polymer polyol; the secondarily modified montmorillonite is used for modifying the adhesive, the use performance and the applicable range of the adhesive are greatly improved, the tensile strength is improved by 38% and more, the bending strength and the bending modulus are improved by 40% and more.

Description

technical field [0001] The invention belongs to the field of polyurethane adhesives, and particularly relates to a method for preparing a polyurethane adhesive by utilizing montmorillonite modified waste and old polyurethane recycling products. Background technique [0002] Polyurethane (PU) is a high molecular polymer mainly prepared from raw materials such as polyisocyanates and polyols. Polyurethane products include soft, semi-rigid and rigid foam, elastomers, fibers, synthetic leather, coatings, resins, adhesives, sealants, etc. A large number of products are widely used in aviation, petrochemical, medical, construction, transportation , automobile, mining, machinery, electromechanical, home appliances, fabrics, footwear, synthetic leather, agriculture and many other fields. With the rapid development of polyurethane, a large amount of waste (including leftovers in production and various types of polyurethane materials that are aged and discarded) has also been generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/04C08G18/65C08G18/34C08G18/12C08G18/08C08J11/24
CPCY02W30/62
Inventor 董雨磊顾晓华李杨齐文斌赵朝阳李美玲薛健张毅曾鹏
Owner SHANGHAI HECHENG POLYMER TECH CO LTD
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