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Production of MDI-polyurethane microporous elastomer

A technology of microcellular elastomer and polyurethane, which is applied in the field of polyurethane microcellular elastomer preparation, can solve the problems of large dynamic fatigue deformation value of MDI-based microcellular elastomer products, and achieve optimization of physical and mechanical properties and improvement of dynamic fatigue deformation value , the effect of reducing randomness

Inactive Publication Date: 2007-06-20
上海凯众聚氨酯有限公司
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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 of the prior art and propose a method for preparing polyurethane microcellular elastomers to solve the problem that the dynamic fatigue deformation value of MDI-based microcellular elastomer products is relatively large

Method used

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  • Production of MDI-polyurethane microporous elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Polytetrahydrofuran copolyether with a molecular weight of 2000 reacts with MDI at 70-90°C to obtain a prepolymer with a -NCO content of 6.2%. The chain extender component is mainly 1.4-butanediol, and the foaming agent, catalyst and surfactant account for 3% of the total;

[0027] Using a low-pressure foaming machine, mix the prepolymer and chain extender components according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into a mold at 90°C to manufacture a microcellular elastomer test piece, and demould after 15 minutes. After aging at 110° C. for 15 hours.

[0028] The tested static mechanical properties are the same as in Comparative Example 1.

[0029] The measured dynamic fatigue performance is the same as that of Comparative Example 1.

[0030] The test results are shown in Table 1.

Embodiment 2

[0032] Polycaprolactone with a molecular weight of 2000 reacts with MDI at 70-90°C to obtain a prepolymer with an -NCO content of 7.8%. The chain extender component is mainly 1.4-butanediol, and the foaming agent, catalyst, and surfactant account for 5% of the total; a low-pressure foaming machine is used to mix the prepolymer and For the chain extender component, inject the reaction liquid into a mold at 90°C to make a microporous elastomer test piece, demould it after 15 minutes, and post-cure at 110°C for 15 hours.

[0033] The tested static mechanical properties are the same as in Comparative Example 1.

[0034] The measured dynamic fatigue performance is the same as that of Comparative Example 1.

[0035] The test results are shown in Table 1.

Embodiment 3

[0037] Polycaprolactone with a molecular weight of 2500 reacts with MDI at 70-90°C to obtain a prepolymer with an -NCO content of 9.5%. The chain extender component is mainly 1.4-butanediol, and the foaming agent and catalyst surfactant account for 8% of the total; a low-pressure foaming machine is used to mix the prepolymer and extender according to the ratio of isocyanate index to 100%. For the chain agent component, inject the reaction material liquid into a mold at 90°C to make a microporous elastomer test piece, demould after 15 minutes, and post-cure at 110°C for 15 hours.

[0038] The tested static mechanical properties are the same as in Comparative Example 1.

[0039] The measured dynamic fatigue performance is the same as that of Comparative Example 1.

[0040] The test results are shown in Table 1.

[0041] Table 1: Static and dynamic mechanical properties of the microcellular elastomers prepared in comparative example 1 and examples 1-3

[0042] serial ...

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Abstract

Production MDI-base polyurethane micro-porous elastomer is prepared by performed polymer, reacting excess polyisocyanate with polyhydroxy compound at 120-140degree to from 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 can be used for buffering and shock-absorbing components.

Description

technical field [0001] The invention relates to a preparation method of polyurethane microporous elastomer, in particular to the technical improvement of optimizing the physical properties 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, microcellular elastomers based on 1.5-NDI have excellent performance, but their production process has shortcomings such as short storage stability of prepolymers and long production cycles; while microcellular elastomers based on MDI have large deformation under dynamic load ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/76C08G18/48C08G101/00
Inventor 刘鸿慈武应涛李建星杨颖韬
Owner 上海凯众聚氨酯有限公司
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