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A spray-molded two-component polyurea skin and its preparation method

A two-component, surface technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem that the surface cannot be matte

Active Publication Date: 2021-07-02
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness of the polyurea in CN109852213A is between Shore A30~Shore A75, has rubber feel but does not have dermis touch, and there are obvious indentations when fingernails are pressed, and it cannot satisfy the matte surface of the automobile instrument panel (glossiness is less than 3.5 , 60°method), wear-resistant (wear-resistant grade greater than 4), clear copy mold pattern requirements
Therefore, there is currently no patented technology about polyurea that can be directly used as a car dashboard skin

Method used

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  • A spray-molded two-component polyurea skin and its preparation method
  • A spray-molded two-component polyurea skin and its preparation method
  • A spray-molded two-component polyurea skin and its preparation method

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preparation example Construction

[0089] The present invention also provides a method for preparing a two-component polyurea skin that can be used as an automobile instrument panel skin by spraying and forming described in the above technical solution, comprising the following steps:

[0090] 1) Reaction of aromatic isocyanate with polyether polyol (or polyester polyol) to prepare a semi-prepolymer containing isocyanate functional group at the end or reacting aliphatic isocyanate with amino-terminated polyether to prepare a semi-prepolymer with isocyanate functional group at the end semi-prepolymer, and then mix the semi-prepolymer with isocyanate functional group at the end with diluent to obtain component A;

[0091] 2) After mixing amino-terminated polyether, amino-terminated chain extender, matting powder, colorant, flame retardant, anti-settling agent, leveling agent, defoamer, ultraviolet light absorber, antioxidant, and fungicide Grinding, when the fineness of grinding is less than 300 mesh, the B compo...

Embodiment 1

[0103] Example 1: Spraying of single-layer aromatic polyurea and preparation of skin

[0104] Preparation of A component: after containing 50wt% 3051 (a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, wherein the content of 2,4'-diphenylmethane diisocyanate is 50%, American Huntsman Company) In the there-necked flask, feed nitrogen, heat up to 45°C, start to drop 38.4wt% low unsaturation polyoxypropylene ether glycol ( Polyol3205, Germany Covestro company) and 9.6wt% low unsaturation polyoxypropylene ether trihydric alcohol ( Polyol6300, German Covestro company), after adding, gradually warming up to 75 ℃, continue to react for 3~4 hours, then the mass percentage composition (NCO%) of the isocyanate functional group of sampling measurement semi-prepolymer is 15.8%; 98wt% After the semi-prepolymer and 2wt% diluent ethylene carbonate (trade name JS 1002, Beijing Biolab Technology Co., Ltd.) are stirred evenly, component A is obtained, whi...

Embodiment 2

[0111] Example 2: Spraying of single-layer aromatic polyurea and preparation of skin

[0112] The preparation of A component: the MDI semi-prepolymer Isonate240 (NCO% is 18.7%) of the polyester diol modification of U.S. Dow chemical company;

[0113] Preparation of component B: mix 44wt% amino-terminated polyoxypropylene ether (35.5wt% difunctional amino-terminated polyoxypropylene ether D-2000 and 8.5 wt% trifunctional amino-terminated polyoxypropylene ether T-5000, U.S. Huntsman company), 46.5wt% amine chain extender (U.S. Huntsman company's 754), 2.0wt% matting powder (fumed silica Aerosil 200, Germany Degussa company), 2wt% color paste (polyurea special color paste, black, SPUA-6861, Dongguan Jifeng Plastic Materials Co., Ltd.), 2.5wt % flame retardant (dimethyl methyl phosphonate DMMP, Qingdao Lianmei Chemical Co., Ltd.), 1wt% anti-settling agent (oxidized polyethylene anti-settling agent 4200-20, Japan KUSUMOTOCHENICALS company), 0.5wt% leveling agent ( Polyether s...

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Abstract

The invention provides a spray-molded two-component polyurea skin that can be used as an automobile instrument panel skin, including two components A and B: component A consists of 95% to 100% semi-prepolymerized polyurea with isocyanate functional groups at the end compound and 0% to 5% diluent; component B consists of 50% to 75% amino-terminated polyether, 20% to 40% amino-terminated chain extender, 0% to 3% matting powder and auxiliary agent composition. Components A and B are sprayed on the surface of the automobile instrument panel skin mold with a design pattern on the surface using professional polyurea spraying equipment, and the polyurea skin is obtained after the polyurea is cured. The polyurea skin provided by the invention has leather touch, matte, wear-resistant, and clear patterns on the surface, and at the same time meets other indicators such as cold resistance, VOC, odor, and flame retardancy of the automobile dashboard skin, and can effectively solve the current polyurethane spraying problem. The production of molded automotive dashboard skins is susceptible to the impact of environmental humidity, resulting in air bubbles.

Description

technical field [0001] The invention relates to the field of automotive interior products, in particular to a method for preparing a spray-molded two-component polyurea skin that can be used as the skin of an automobile instrument panel. Background technique [0002] At present, medium and high-end cars generally use soft instrument panel skins. The manufacturing processes include: slush molding skins, polyurethane spray molding skins, injection molded polyurethane skins, leather coating, vacuum molding, etc. Various processes have their own advantages and disadvantages, among which polyurethane spray molding skin has the advantages of good surface pattern quality and long service life of the mold. [0003] So far, a small number of enterprises have the patented technology of polyurethane spray molding skin. CN101448867B discloses a method: a two-component aliphatic polyurethane reaction mixture is sprayed onto the mold surface to produce a first elastic polyurethane layer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/02C08G18/76C08G18/50C08G18/67C08G18/66C08G18/32C08G18/42C08G18/75
CPCC08G18/4018C08G18/42C08G18/482C08G18/5024C08G18/6685C08G18/6795C08G18/755C08G18/757C08G18/7671C09D175/02
Inventor 许东华刘芳李双双石彤非付志磊潘鸽杨雪赵志刚
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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