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Method for producing PPDI based polyurethane micropore 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 large dynamic fatigue deformation, low ball resilience, high compression set value, etc., and achieve the effect of overcoming large deformation

Active Publication Date: 2009-07-01
上海凯众材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a preparation method of PPDI-based polyurethane microcellular elastomers, to overcome the shortcomings in the production process of NDI-based microcellular elastomers in the prior art, and to solve the problem of MDI-based microcellular elastomers. Problems with high compression set value, large dynamic fatigue deformation and low ball resilience

Method used

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  • Method for producing PPDI based polyurethane micropore elastomer

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Polyethylene adipate with a molecular weight of 2000 reacts with PPDI at 90-110°C to obtain a prepolymer with an NCO content of 6.2%. The main expansion agent is polyethylene adipate, and the foaming agent is water , tertiary amine catalysts, and anionic surfactants account for 3% of the total.

[0035] Using a low-pressure foaming machine, mix the prepolymer and the expansion agent according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into the mold at 110°C, demould after 30 minutes, and post-cure at 110°C for 24hrs.

[0036] The test pieces and products prepared in this example were placed at room temperature for one week, and then their dynamic fatigue performance, static compression set performance and ball resilience were measured.

[0037] The test results are shown in Table 1.

Embodiment 2

[0039] Polycaprolactone with a molecular weight of 2000 and PPDI are reacted at 90-110°C to obtain a prepolymer with an NCO content of 8.50%. The extender is mainly polyadipate, and the foaming agent is water and tertiary amine Catalysts and anionic surfactants account for 3% of the total.

[0040] Using a low-pressure foaming machine, mix the prepolymer and the expansion agent according to the ratio of the isocyanate index to 100%, inject the reaction material liquid into the mold at 110°C, demould after 30 minutes, and post-cure at 110°C for 24hrs.

[0041] The test pieces and products prepared in this example were placed at room temperature for one week, and then their dynamic fatigue performance, static compression set performance and ball resilience were measured.

[0042] The test results are shown in Table 1.

[0043] Table 1. Comparative examples 1-2 and the product physical property test result of embodiment 12

[0044] project Comparative Example 1 Co...

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Abstract

The invention discloses a method for preparing a polyurethane microporous elastomer by using p-phenylene diisocyanate (PPDI) as an isocyanate component. The preparation method comprises the steps of preparation of prepolymer, mixing, modeling, post curing, and the like. The PPDI based polyurethane microporous elastomer prepared by the method has improved compression deformation set property and ball return elasticity, is mainly used as a high-intensity damping element for bearing dynamic fatigue, such as a damping element of a vehicle such as an automobile and the like, a bridge damping block, and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane microcellular elastomer, in particular to a preparation method of a polyurethane microcellular elastomer with p-phenylene diisocyanate (PPDI) as an isocyanate component. Background technique [0002] Due to the excellent static and dynamic mechanical properties of polyurethane microcellular elastomers, it is especially suitable for making damping system components under swing vibration conditions. 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. [0003] Chinese patent CN1982351A disclosed on June 20, 2007 a method for preparing an NDI-based polyurethane microcellular elastomer. The preparation method includes the following steps: (1) Preparation of...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/10C08G101/00
Inventor 刘鸿慈
Owner 上海凯众材料科技股份有限公司
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