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Production of NDI-polyurethane microporous elastomer

A technology of microcellular elastomer and polyurethane, which is applied in the field of preparation of polyurethane microcellular elastomer, can solve the problems of insufficient weather resistance and hydrolysis stability of NDI-based microcellular elastomer, and achieve the effect of optimizing hydrolysis resistance

Active Publication Date: 2007-06-20
上海凯众材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and propose a method for preparing polyurethane microcellular elastomers to solve the problem of NDI-based microcellular elastomers’ weather resistance, especially insufficient hydrolytic stability, thereby prolonging the use of high-end products life

Method used

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  • Production of NDI-polyurethane microporous elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Poly(trimethylolpropane-2-methyl-1.3propylene glycol-1.4-butanediol adipate) ester with a molecular weight of 3000 and a functionality of 2.3 reacts with NDI at 120-140°C to obtain -NCO content 8.2% prepolymer. The crosslinking agent component is mainly polyester, and the auxiliary component includes foaming agent, catalyst, surfactant, etc., wherein the auxiliary component accounts for 15% of the total crosslinking agent; using a low-pressure foaming machine, according to isocyanate The ratio of the index is 100%, mix the prepolymer and crosslinking agent components, inject the reaction material liquid into the mold at 65-90°C to make the microporous elastomer test piece, demould after 30min, and then put it into the oven at 110°C Post-cure for 15 hours.

[0031] The test piece prepared according to this embodiment was placed at room temperature for one week, and then its mechanical properties and hydrolysis resistance were measured.

[0032] Test mechanical properti...

Embodiment 2

[0036] Poly(1,2-dimethylpropanediol-1.4-butylene glycol-ethylene glycol adipate) ester with a molecular weight of 2000 reacts with NDI at 120-140°C to obtain a prepolymer with a -NCO content of 6.50%. body. The crosslinking agent component is mainly polyester, and the auxiliary component includes foaming agent, catalyst, surfactant, etc., wherein the auxiliary component accounts for 15% of the total crosslinking agent; using a low-pressure foaming machine, according to isocyanate The ratio of the index is 100%, mix the prepolymer and crosslinking agent components, inject the reaction material liquid into the mold at 65-90°C to make the microporous elastomer test piece, demould after 30min, and then put it into the oven at 110°C Post-cure for 15 hours.

[0037] The test piece prepared according to this embodiment was placed at room temperature for one week, and then its mechanical properties and hydrolysis resistance were measured.

[0038] Test mechanical properties with com...

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Abstract

Production of NDI-base polyurethane micro-porous elastomer is carried out by preparing performed polymer, reacting excess polyisocyanate with polylol at 120-140degree to form NCO-base performed polymer, pouring, mixing performed polymer with chain extender proportionally, injecting reactive liquid into mould at 80-95degree, pre-curing, de-molding, and after-curing for de-molded product at 110degree for 13-16hrs. It has excellent weathering resistance and hydrolytic stability. It can be used for high-strength damping element, buffering component and shock-absorbing block.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane microporous elastomer, in particular to the technical improvement of optimizing the hydrolysis resistance of the product. Background technique [0002] Due to the excellent static and dynamic mechanical properties of polyurethane microcellular elastomers, it is especially used in rocking vibration and damping systems. Their industrial importance is due to the combination of their good mechanical properties and cheap and convenient processing methods. Using various chemical structural components in different mixing ratios can produce products with widely different mechanical properties and processability. As we all know, 1.5-NDI-based microcellular elastomers have excellent performance, and have advantages that other isocyanate-based products cannot match in terms of dynamic fatigue performance and fatigue deformation performance, so they have been used as high-end products in special fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/42C08G18/18C08G101/00
Inventor 杨颖韬侯瑞宏武应涛刘鸿慈
Owner 上海凯众材料科技股份有限公司
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