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A method for preparing polyurethane adhesive by using montmorillonite modified waste polyurethane recycling product

A polyurethane adhesive, polyurethane technology, applied in polyurea/polyurethane adhesives, adhesives, plastic recycling, etc., can solve the problem of poor compatibility between montmorillonite and polyurethane, poor mechanical strength and heat resistance, organic montmorillonite Solve problems such as poor soil dispersibility, achieve the effects of improving mechanical strength and heat resistance, easy operation, and low cost

Active Publication Date: 2016-09-14
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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  • A method for preparing polyurethane adhesive by using montmorillonite modified waste polyurethane recycling product
  • A method for preparing polyurethane adhesive by using montmorillonite modified waste polyurethane recycling product
  • A method for preparing polyurethane adhesive by using montmorillonite modified waste polyurethane recycling product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a three-neck round bottom flask equipped with a stirrer, a condenser, and a thermometer, add 10g of waste polyurethane elastomer with a particle size of 10mm after crushing at a low temperature of -10°C, 10g of 1,4-butanediol, and 0.5g of KOH while stirring The reaction mixture was heated to 160° C., and kept at this temperature for 3 hours, the polyurethane elastomer was completely dissolved, and the product was light brown. After water washing, suction filtration, and water removal process, 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 into 90g of water and mechanically stir to form a stable suspension, add 5g of tetradecyltriphenylphosphine bromide, heat in a water bath to 80°C for 5 hours, wash and dry to obtain a primary modified montmorillonite . Take 5g of primary modified montmorillonite and dissolve it in acetone, then increase the tempe...

Embodiment 2

[0038] Add 5g of organic montmorillonite nanoparticles into 90g of water and mechanically stir to form a stable suspension, add 5g of hexadecyltriphenylphosphine bromide, heat in a water bath to 80°C for 5 hours, wash and dry to obtain a primary modified montmorillonite . Take 5g of primary modified montmorillonite and dissolve it in acetone, then increase the temperature of the system to 80°C, add 5g of 2,4-diphenylmethane diisocyanate as a secondary modifier, react for 3h, and make the prepared montmorillonite The sample was washed again with acetone for 3 times and then dried in vacuum at 100°C to obtain secondary modified montmorillonite.

[0039] Heat 8 g of the polyol obtained after degradation in Example 1 to 105 °C and vacuumize for 1.5 h to remove moisture, add 2 g of 2,4-diphenylmethane diisocyanate, add 0.15 g of the above-mentioned secondary modified montmorillonite, and heat at 65 °C React for 3 hours; add 1.05 g of dried dimethylolpropionic acid under continuous...

Embodiment 3

[0042] Add 5g of organic montmorillonite nanoparticles into 90g of water and mechanically stir to form a stable suspension, add 5g of tetradecyltriphenylphosphine bromide, heat in a water bath to 80°C for 5 hours, wash and dry to obtain a primary 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 a secondary modifier, react for 3 hours, and use the prepared montmorillonite sample again Washed with acetone for 3 times and then dried in vacuum at 100°C to obtain secondary modified montmorillonite.

[0043] Degrade 4g of the polyol obtained in Example 1, heat to 105°C and vacuumize for 1.5h to remove moisture, add 2g of 2,4-diphenylmethane diisocyanate, add 0.15g of the above-mentioned secondary modified montmorillonite, and react at 65°C 3h; add 1.05g of dried dimethylolpropionic acid under constant stirring, and react at 40°C for 5h to obtain a prepolymer...

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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 in particular relates to a method for preparing polyurethane adhesives by using montmorillonite modified waste polyurethane recycling products. Background technique [0002] Polyurethane (PU) is a high molecular polymer mainly prepared from raw materials such as polyisocyanate and polyol. Polyurethane product forms include soft, semi-rigid and rigid foam plastics, elastomers, fibers, synthetic leather, coatings, resins, adhesives, sealants, etc. A large number of products are widely used in aviation, petrochemical, medical, construction, transportation , automobiles, 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 scraps in production and various types of polyurethane materials that are used and discarded) is also generated. The ...

Claims

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Application Information

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Patent Type & Authority Patents(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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