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Preparation method of polyurethane microporous elastomer

A technology of microporous elastomer and polyurethane, which is applied in the field of materials, can solve the problems of limited application, difficulty in meeting the demand for low-temperature compression set performance, poor low-temperature flexibility, etc., and achieve excellent low-temperature flexibility, excellent low-temperature compression set performance, and optimized The effect of the preparation process

Pending Publication Date: 2022-04-22
上海凯众材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for special occasions, such as minus 20 to 30 degrees, its low-temperature flexibility (defined as the ratio of hardness at a specific temperature to the hardness at room temperature, the larger the ratio, the worse the low-temperature flexibility) and low-temperature compression set The performance has been difficult to meet the demand, which limits its further application

Method used

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  • Preparation method of polyurethane microporous elastomer
  • Preparation method of polyurethane microporous elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of prepolymer: After melting 100 parts by weight of PTMEG with a hydroxyl value of 56 mgKOH / g at 80° C., adding 40 parts by weight of XDI, and keeping the temperature for 30 minutes, a clear and transparent polyurethane prepolymer was obtained. Cool to 60°C while stirring to obtain a transparent and clear mixed prepolymer.

[0019] Chain extender preparation: 100 parts by weight of PTMEG with a hydroxyl value of 56mgKOH / g melted at 60°C was added to 5 parts by weight of water, 0.5 parts by weight of a foam stabilizer, and 0.4 parts by weight of a catalyst, and they were stirred and mixed for 2 hours to obtain chain extender.

[0020] Preparation of polyurethane microcellular elastomer finished product: Mix and stir the 80°C prepolymer and 50°C chain extender at a weight ratio of 100:35, and carry out foaming reaction. The reaction time is 30 minutes. After aging, the finished product is obtained for evaluation.

Embodiment 2

[0022] On the basis of Example 1, in the chain extender component, the weight portion of water is reduced to 2.5, and the added glycol is changed from PTMEG to 1,4-butanediol, and its weight portion is 4, and other conditions remain unchanged .

Embodiment 3

[0024] On the basis of Example 1, when the prepolymer was prepared, PCL with a hydroxyl value of 56 mgKOH / g was used, and other conditions remained unchanged.

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Abstract

The invention discloses a preparation method of a polyurethane microporous elastomer, which comprises the steps of preparation of a prepolymer, preparation of a chain extender, casting molding, post-curing and the like, and the polyurethane microporous elastomer is prepared by selecting and designing the type of the prepolymer, using the chain extender containing active hydrogen, optimizing the preparation process and the like. The prepared polyurethane microporous elastomer has excellent low-temperature flexibility and low-temperature compression permanent deformation performance.

Description

technical field [0001] The invention relates to the field of materials, in particular to a preparation method of polyurethane microporous elastomer. Background technique [0002] Polyurethane microcellular elastomer (PUR) has good creep resistance, high structural strength, excellent resilience, insect resistance and bending fatigue resistance, wear resistance and dimensional stability. At the same time, it also has good flexibility at low temperature. It can also maintain good performance at high temperatures, so it is widely used as a high-strength damping element that withstands dynamic fatigue, such as cushioning and shock-absorbing elements for vehicles such as automobiles, and bridge shock-absorbing blocks. But for special occasions, such as minus 20 to 30 degrees, its low-temperature flexibility (defined as the ratio of hardness at a specific temperature to the hardness at room temperature, the larger the ratio, the worse the low-temperature flexibility) and low-tempe...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/32C08G18/10C08G18/42C08G18/48
CPCC08G18/10C08G18/4854C08G18/6674C08G18/4277C08G18/664C08G18/48C08G18/3206
Inventor 曹以前
Owner 上海凯众材料科技股份有限公司
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