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A High Open Pore Ratio Polyurethane Cavity Filling Foam

A polyurethane and open-cell rate technology, which is applied in the field of high open-cell rate polyurethane cavity filling foam, can solve the problems of unmentioned foam and high open-cell rate.

Active Publication Date: 2021-04-20
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But neither mentioned how to make the foam have a high open cell ratio

Method used

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  • A High Open Pore Ratio Polyurethane Cavity Filling Foam
  • A High Open Pore Ratio Polyurethane Cavity Filling Foam
  • A High Open Pore Ratio Polyurethane Cavity Filling Foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Each raw material in the described component A becomes by mass parts:

[0053]

[0054]

[0055] Component B is Wanhua Chemical PM200, and the mass ratio of components A and B is 1:1.

[0056] The material temperature of component A and component B is controlled at 25±2°C. After mixing component A and component B, use a mechanical stirring head to stir for 2 seconds, then pour into a mold with a constant temperature of 45°C without a cover to foam and solidify.

[0057] Test after 1 hour of foaming and curing time. Foam density 29.5kg / m 3 , The opening rate is 99.6%. After storage at 70°C and 100% humidity for 48 hours, the dimensional change is less than 0.1%. The exact filling experiment was done in a horizontal square mold of 25cm*25cm*8cm. The mold was cured at a constant temperature of 45°C for 1 hour, and the actual filling volume was 96.2% of the original volume.

Embodiment 2

[0059] Each raw material in the described component A becomes by mass parts:

[0060]

[0061] Component B is Wanhua Chemical PM200, and the mass ratio of components A and B is 1:1.

[0062] The material temperature of component A and component B is controlled at 25±2°C. After mixing component A and component B, use a mechanical stirring head to stir for 2 seconds, then pour into a mold with a constant temperature of 45°C without a cover to foam and solidify.

[0063] Test after 1 hour of foaming and curing time. The prepared foam density is 29.8kg / m 3 , The opening rate is 98.3%. After storage at 70°C and 100% humidity for 48 hours, the dimensional change is less than 0.1%. The exact filling experiment was done in a horizontal square mold of 25cm*25cm*8cm. The mold was cured at a constant temperature of 45°C for 1 hour, and the actual filling volume was 98.9% of the original volume.

Embodiment 3

[0065] Each raw material in the described component A becomes by mass parts:

[0066]

[0067] Component B is Wanhua Chemical PM200, and the mass ratio of components A and B is 1:1.

[0068] The material temperature of component A and component B is controlled at 25±2°C. After mixing component A and component B, use a mechanical stirring head to stir for 2 seconds, then pour into a mold with a constant temperature of 45°C without a cover to foam and solidify.

[0069] Test after 1 hour of foaming and curing time. Foam density 31.5kg / m 3 , The opening rate is 98.6%. After storage at 70°C and 100% humidity for 48 hours, the dimensional change is less than 0.1%. The exact filling experiment was done in a horizontal square mold of 25cm*25cm*8cm. The mold was cured at a constant temperature of 45°C for 1 hour, and the actual filling volume was 94.6% of the original volume.

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Abstract

The invention relates to a polyurethane cavity filling foam with a high open cell ratio. The raw material of described foam comprises component A and component B, and component A comprises polyether polyol, monohydroxy composition, flame retardant, chain extender, foam stabilizer, cell opening agent, catalyst and water; B is polyphenylmethane polyisocyanate. The monohydric composition comprises monohydric alcohols and / or ethers, and monohydroxyl amines. The addition of the monohydroxyl composition increases the foam opening ratio, improves the compatibility of components A and B on the one hand, and improves the toughness of the foam; on the other hand, it participates in the foaming reaction process, controls the viscosity growth in the initial stage of foaming, and improves Foam fluidity. The cavity is filled with foam, has a high open cell ratio and good sound absorption effect, and is especially suitable for filling complex-shaped cavities.

Description

technical field [0001] The invention relates to a polyurethane cavity filling foam with a high open cell ratio. Background technique [0002] With the development of science and technology, the research and understanding of polyurethane foam materials continue to deepen, and the application of polyurethane foam materials is no longer limited to the traditional thermal insulation industry. Due to the good operability, strong controllability, and good filling effect of the polyurethane foaming process, and the foam itself has the effect of sound attenuation and reinforcement, it is widely used in the field of cavity filling foam including automotive NVH. [0003] Polyurethane foam is obtained by mixing component A composed of polymer polyols, catalysts, chain extenders, foaming agents and flame retardants, and component B composed of polyphenylmethane polyisocyanate in a certain proportion. During the foaming process, it needs to react as soon as possible, provide heat to mak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/28C08G101/00
CPCC08G18/282C08G18/283C08G18/2875C08G18/3206C08G18/4804C08G18/6674C08G2110/0083
Inventor 李雅迪庞德政陈丁丁宋阔高博华卫琦
Owner WANHUA CHEM GRP CO LTD