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Polyurethane integral skin foam and preparation method thereof

A self-skinning and polyurethane technology, applied in the field of polymer materials, can solve the problems of increasing the density of polyurethane foam, strong odor, thin crust layer, etc., and achieve the effects of good impact resistance, low odor and low volatilization

Inactive Publication Date: 2018-05-04
杨坚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, many automobile steering wheels in China use polyurethane self-skinning foam foamed by dichlorofluoroethane (HCFC-141b) foaming agent. Although the skin of this foam is relatively thick, the problem is that the foaming agent used Destroys the ozone layer
At the same time, there are problems such as thin crust layer, small pores on the surface of the product, high VOC content, and strong odor.
At present, the method to solve the pores is to spray a layer of in-mold paint in advance to cover the cavity. Spraying in-mold paint not only increases the process and material costs, but also increases the odor of the steering wheel and the VOC content.
In addition, it is also possible to increase the density of polyurethane foam and increase the thickness of the crust to reduce surface pores, but this will increase the weight of the product, which does not meet the requirements of lightweight automobiles

Method used

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  • Polyurethane integral skin foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh the following raw materials for subsequent use:

[0027] Material A: polyether polyol 70kg, cell opener 0.5kg, foam stabilizer 0.5kg, silicone surfactant 1kg, A-1 1kg, PC-77 catalyst 1kg, diethylene glycol amine 1kg, ethylene glycol 2kg, A33 is 1kg, water 0.5kg.

[0028] Material B: Modified MDI 32kg.

[0029] Put polyether polyol, cell opening agent, foam stabilizer, silicone surfactant, A~1, PC~77 catalyst, diethylene glycol amine, ethylene glycol, A33, water into the reaction kettle in sequence, at room temperature Under the conditions, the rotation speed is 50 rpm, and the mixture A is obtained by stirring for 0.5 h; another modified MDI is used as the B material, and the A and B materials are injected into the closed mold, and after 45 minutes of demoulding, the skinned polyurethane foam product is obtained.

Embodiment 2

[0031] Weigh the following raw materials for subsequent use:

[0032] Material A: polyether polyol 72kg, cell opening agent 1kg, foam stabilizer 0.8kg, silicone surfactant 2kg, A-12kg, PC-77 2kg, diethylene glycol amine 1.5kg, ethylene glycol 4kg, A33 2kg, water 0.8kg.

[0033] Material B: Modified MDI 40kg.

[0034] Put polyether polyol, cell opening agent, foam stabilizer, silicone surfactant, A~1, PC~77 catalyst, diethylene glycol amine, ethylene glycol, A33, water into the reaction kettle in sequence, at room temperature Under the conditions, the rotation speed is 60 rpm, and the mixture A is obtained by stirring for 0.5 h; another modified MDI is taken as the B material, and the mass ratio of the A and B materials is injected into the closed mold, and after 60 seconds of demoulding, the skinned polyurethane foam is obtained. products.

Embodiment 3

[0036] Weigh the following raw materials for subsequent use:

[0037] Material A: polyether polyol 75kg, cell opening agent 1.2kg, foam stabilizer 1kg, silicone surfactant 3kg, A-13kg, PC-77 3kg, diethylene glycol amine 2kg, ethylene glycol 5kg, A33 3kg , water 1kg.

[0038] Material B: Modified MDI 49kg.

[0039] Put polyether polyol, cell opening agent, foam stabilizer, silicone surfactant, A~1, PC~77 catalyst, diethylene glycol amine, ethylene glycol, A33, water into the reaction kettle in sequence, at room temperature Under the conditions, the rotation speed is 65 rpm, and the mixture A is obtained by stirring for 1 h; another modified MDI is used as the B material, and the A and B materials are injected in a closed mold, and after 70 seconds of demoulding, the skinned polyurethane foam product is obtained.

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Abstract

The invention discloses polyurethane integral skin foam and a preparation method thereof, and relates to the field of high polymer materials. The foam is prepared from a material A and a material B according to the weight ratio of 5 to 2-3, wherein the material B is modified MDI; the material A is prepared from the following raw materials in parts by weight: 70 to 80 parts of polyether polyol, 0.5to 2 parts of a hole opening agent, 0.5 to 1.5 parts of a foam stabilizing agent, 1 to 5 parts of a silicone surfactant, 1 to 5 parts of A-1, 1 to 5 parts of a PC-77 catalyst, 1 to 3 parts of diethylenediamine, 2 to 8 parts of ethylene glycol, 1 to 5 parts of an A33 catalyst and 0.5 to 1.5 parts of water. According to the application, water serves as a foaming agent completely and does not contain Freon which damages the atmospheric ozone layer; the polyurethane integral skin foam has high elastic resilience, wear resistance and impact resistance when the polyurethane integral skin foam is used for an automobile steering wheel, and further has the advantages of low odour, environmental friendliness, pollution free and the like, and can reach the hardness of 58 to 68 (shore A), the resilience of greater than or equal to 50 percent, the odour (23 DEG C) of level 1.4, the odour (40 DEG C) of level 2.0, the odour (80 DEG C) of level 2.5, and the VOC value of less than or equal to 55 mu g / m<3>.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyurethane self-skinned foam and a preparation method thereof. Background technique [0002] As an indispensable interior part of a car, the steering wheel undertakes important responsibilities such as remote control of the car and ensuring safety. With the development of the automobile industry, people not only put forward high requirements for its performance, but also put forward high requirements for its comfort, safety and environmental protection. [0003] At present, many automobile steering wheels in China use polyurethane self-skinning foam foamed by dichlorofluoroethane (HCFC-141b) foaming agent. Although the skin of this foam is relatively thick, the problem is that the foaming agent used Agents are detrimental to the ozone layer. At the same time, there are problems such as thin crust layer, small pores on the surface of the product, high VOC content, and strong...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/16C08G101/00
CPCC08G18/16C08G18/2063C08G18/3206C08G18/48C08G18/6674C08G2110/0083
Inventor 杨坚
Owner 杨坚
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