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A kind of preparation method of polyurethane composite material

A composite material and polyurethane technology, which is applied in the field of polyurethane composite material preparation using high pressure injection molding process, can solve the problems of insufficient flame retardant performance, insufficient heat resistance, slow molding speed, etc., and achieves good dimensional stability and resistance. Excellent flammability and short demolding time

Active Publication Date: 2022-07-12
WANHUA CHEM BEIJING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the resins commonly used in the HP-RTM process on the market are mainly epoxy resins and polyurethane resins, but there are three disadvantages: (1) The impregnation of the fibers by the resin is not ideal, and the porosity of the product is high; (2) The resin is operable The matching between time and molding speed is not good, and it is difficult to achieve high quality and high production speed; (3) In the mold cavity with large area and complex structure, it is impossible to predict and control, and the resin flow is not balanced
[0004] Patent CN106232671A discloses a composite fiber component and its manufacture. The technical solution is a fiber composite component obtained by impregnating fibers with a polyurethane reactive resin mixture formed of polyisocyanate, polyol, two or more thermally latent catalysts, etc., and its resin The molding speed is still slow, the glass transition temperature is only 110°C, and the heat resistance is not high enough; secondly, under the condition of adding flame retardants, its flame retardant performance is not high enough
The above performance still cannot meet the demand

Method used

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  • A kind of preparation method of polyurethane composite material
  • A kind of preparation method of polyurethane composite material
  • A kind of preparation method of polyurethane composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The raw materials used in the examples and comparative examples are as follows:

[0042] Isocyanates:

[0043] WANNATE PM200, NCO content 31.2wt%, viscosity 200mpa.s at 25℃, Wanhua Chemical,

[0044] WANNATE MDI50, NCO content 33.5wt%, viscosity 10mpa.s at 25℃, Wanhua Chemical,

[0045] Isocyanate prepolymer A, NCO content 29.5wt%, viscosity 145mpa.s at 25°C, obtained by reaction of isocyanate compound and polyester polyol, the isocyanate compound is a mixture of WANNATE PM200 and WANNATE MDI50, the polyester polyol The hydroxyl value is 56mgKOH / g, and the functionality is 2;

[0046] Polyether polyol 1, starting with glycerin, hydroxyl value 560mgKOH / g, propylene oxide polymerization, viscosity 350mpa.s at 25°C;

[0047] Polyether polyol 2, starting with glycerin, hydroxyl value 420mgKOH / g, propylene oxide polymerization, viscosity 380mpa.s at 25°C;

[0048] Polyether polyol 3, starting with glycerin, hydroxyl value 336mgKOH / g, propylene oxide polymerization, visco...

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Abstract

The invention discloses a preparation method of a polyurethane composite material. The preparation method controls the injection pressure of the reactant and the vacuum degree of the mold, and the defined reactant has suitable operation time and lower viscosity. The composite material has the characteristics of low viscosity in the early stage, slow viscosity growth, extremely fast curing speed in the later stage, short demoulding time, etc. The composite material prepared by the method has excellent heat resistance and mechanical properties.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane composite material, in particular to a preparation method of a polyurethane composite material by using a high-pressure injection molding process. Background technique [0002] High pressure resin transfer molding (HP-RTM) process technology is a new type of process for mass production of high-performance composite materials introduced in recent years. It uses preforms, steel films, vacuum-assisted exhaust, and high-pressure injection , so that the resin liquid can quickly fill the mold cavity and solidify. This process produces products with high efficiency, good dimensional stability, high quality, and low cost of mass production of composite materials, and realizes diversified and complex structural products. [0003] At present, the resins commonly used in the HP-RTM process on the market are mainly epoxy resins and polyurethane resins, but they have the following three shortcomings: (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32
CPCC08G18/7671C08G18/7664C08G18/6677C08G18/4804C08G18/3206
Inventor 文振广赵军程栋梁沈沉赵怡
Owner WANHUA CHEM BEIJING
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