Polyurethane composite material and preparation method thereof

A composite material and polyurethane technology, which is applied in the field of polyurethane composite material preparation using a high-pressure injection molding process, can solve the problem of poor matching between resin operation time and molding speed, difficulty in synergy between high quality and high production speed, and slow resin molding speed. And other issues

Active Publication Date: 2020-04-17
WANHUA CHEM BEIJING +1
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  • Abstract
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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 p

Method used

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  • Polyurethane composite material and preparation method thereof
  • Polyurethane composite material and preparation method thereof
  • Polyurethane composite material and preparation method thereof

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Embodiment Construction

[0048] In order to better understand the technical solution of the present invention, the content of the present invention will be further described below in conjunction with the examples, but the content of the present invention is not limited only to the following examples.

[0049] Embodiment and comparative example use raw material as follows:

[0050] Isocyanate:

[0051] Polymeric MDI, WANNATE PM200, NCO content 31.2wt%, viscosity at 25°C 200mpa.s, Wanhua Chemical,

[0052] MDI monomer, WANNATE MDI50, NCO content 33.5wt%, viscosity at 25°C 10mpa.s, Wanhua Chemical, a mixture of 2,4-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate ;

[0053]Isocyanate prepolymer A, NCO content 29.5wt%, viscosity 145mpa.s at 25°C, obtained by prepolymerization of isocyanate compound and 6% polyester polyol based on the weight of the isocyanate compound, said prepolymerization process steps include : Put the isocyanate compound and polyester polyol into the reaction ket...

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Abstract

According to the polyurethane composite material and the preparation method thereof, the preparation method can improve the infiltration effect of a mixed material on a reinforcing material, and is particularly suitable for an HP-RTM process needing rapid curing, product defects are reduced, the production efficiency is improved, and meanwhile the product is excellent in toughness and good in mechanical property. The preparation method comprises the following steps: 1) mixing an isocyanate component and an isocyanate reactive component; and 2) injecting the obtained mixed material into a moldwith a built-in reinforcing material, and carrying out a reaction to obtain the polyurethane composite material; wherein the isocyanate component comprises polymerized MDI and an MDI monomer, and theisocyanate reactive component comprises polyether polyol and a catalyst, and optionally comprises small molecular alcohol and an internal releasing agent.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane composite material, in particular to a method for preparing a polyurethane composite material using a high-pressure injection molding process. Background technique [0002] High-pressure resin transfer molding (HP-RTM) process technology is a new process introduced in recent years for mass production of high-performance composite materials. It uses prefabricated parts, steel film, vacuum-assisted exhaust, and high-pressure injection , so that the resin liquid quickly fills the mold cavity and solidifies. This process produces products with high efficiency, high quality, 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 there are three disadvantages: (1) The impregnation of the fibers by the resin is...

Claims

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Application Information

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IPC IPC(8): C08G18/79C08G18/76C08G18/48C08J5/04C08L75/08C08K7/14
CPCC08G18/4804C08G18/721C08G18/7671C08G18/794C08K7/14C08L75/08
Inventor 赵军王晓星曹铖文振广沈沉赵怡
Owner WANHUA CHEM BEIJING
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