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Active cross-linking agent, cross-linked polyurethane material as well as preparation method and recovery method thereof

A technology of cross-linked polyurethane and recycling method, which is applied in the field of active cross-linking agent, cross-linked polyurethane material and its preparation method and recycling, which can solve the problem of loss of thermoplastic processing performance, non-compliance with green chemistry and sustainable development, and poor solvent resistance and other issues, to achieve the effect of improved mechanical properties, low cost and high reaction efficiency

Pending Publication Date: 2021-12-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Linear thermoplastic polyurethane has the advantage of thermoplastic processing, but has disadvantages such as poor solvent resistance during use, so in some applications, it is necessary to add a cross-linking agent to form a cross-linked structure to further improve its solvent resistance and mechanical properties
However, the cross-linked elastomeric material loses its thermoplastic processing properties, and recycling becomes a new problem
Not in line with the general trend of green chemistry and sustainable development

Method used

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  • Active cross-linking agent, cross-linked polyurethane material as well as preparation method and recovery method thereof
  • Active cross-linking agent, cross-linked polyurethane material as well as preparation method and recovery method thereof
  • Active cross-linking agent, cross-linked polyurethane material as well as preparation method and recovery method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 1.001 g of acetylacetone and 0.911 g of 2-amino-1,3-propanediol in 5 mL of tetrahydrofuran, and react at 45°C for 12 hours. The solvent was removed by rotary evaporation, and dried in a vacuum oven at 40° C. for 12 hours to obtain (1,3-dihydroxypropyl-2-yl)-pent-3-en-2-one. figure 1 This is the NMR pattern of (1,3-dihydroxypropyl-2-yl)-pent-3-en-2-one.

Embodiment 2

[0036] 2.002 g of acetylacetone and 0.912 g of 1,3-diamino-2-hydroxypropane were dissolved in 5 ml of ethanol, and reacted at 45° C. for 12 hours. The solvent was removed by rotary evaporation, and dried in a vacuum oven at 40°C for 12 hours to obtain 4,4'-(2-hydroxypropane-1,3-diacyl)bis(malonyl)-bis(pent-3-ene-2- ketone). figure 2 This is the nuclear magnetic spectrum of the 4,4'-(2-hydroxypropane-1,3-diacyl)bis(malonyl)-bis(pent-3-en-2-one).

Embodiment 3

[0038] 0.3464 g of (1,3-dihydroxypropyl-2-yl)-pent-3-en-2-one prepared in Example 1 was dissolved in 20 mL of tetrahydrofuran with 2 g of polytetrahydrofuran and 1.1115 g of IPDI and mixed uniformly. Dry at 60°C for 48 hours, remove the solvent at 100°C and complete the cross-linking reaction. to obtain a cross-linked polyurethane elastomer, image 3 is the stress-strain graph of the crosslinked polyurethane elastomer.

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Abstract

The invention provides an active cross-linking agent, a cross-linked polyurethane material as well as a preparation method and a recovery method thereof, and belongs to the technical field of polyurethane. The preparation method of the active cross-linking agent comprises the steps of dissolving a beta-diketone compound, a monoamine molecule containing two hydroxyl groups in the molecule or a diamine molecule containing one hydroxyl group in the molecule and a triamine molecule in an organic solvent, mixing according to a certain molar ratio, stirring to react for a certain time, and removing the solvent. The method for cross-linking the polyurethane elastomer through the active cross-linking agent is simple, the raw materials are easy to obtain, and the cost is low. The preparation method of the cross-linking agent is simple and efficient in reaction. The mechanical properties and the like of the obtained modified elastomer material are improved, and the material has thermoplasticity and can be processed and used again. The modified elastomer material can be widely applied to daily life and industrial production.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to an active crosslinking agent, a crosslinked polyurethane material, a preparation method and a recycling method thereof. Background technique [0002] Polyurethane elastomers have the characteristics of oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, etc., and are widely used in the fields of home furnishing, construction, daily necessities, transportation, and home appliances. Linear thermoplastic polyurethane has the advantage of thermoplastic processing, but has disadvantages such as poor solvent resistance during use. Therefore, in some applications, a cross-linking agent needs to be added to form a cross-linked structure to further improve its solvent resistance and mechanical properties. However, the cross-linked elastomer material loses its thermoplastic processing properties, and recycling has become a new problem. Not in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C221/00C07C225/14C08G18/67C08G18/48
CPCC07C221/00C07C225/14C08G18/675C08G18/4854
Inventor 白静史子兴
Owner SHANGHAI JIAO TONG UNIV