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Fibre-reinforced polyurethane modified polyisocyanurate composite material and preparation method thereof

A polyisocyanurate and polyurethane modification technology, which is applied in the field of low-density fiber-reinforced polyurethane composite materials and its preparation, can solve problems such as accelerated chemical reaction, fluidity decline, and destruction, so as to improve fluidity and reduce viscosity , the effect of good fluidity

Inactive Publication Date: 2010-05-12
SHANGHAI HAOHAI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, organic chlorofluorocarbon blowing agents have a destructive effect on the earth's atmospheric ozone layer, and increasing the processing temperature of raw materials accelerates the chemical reaction to a certain extent, resulting in a decrease in fluidity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The reaction injection molding process is adopted, and the pouring machine uses a high-pressure injection machine from Cannon Company, with a mixing pressure of 15 MPa and a pouring rate of 280 g / s. The mold size is 900×900mm, and the thickness is 2.5mm. The polyisocyanate has a reactivity index of 120 and a glass fiber content of 10%. When the product is produced according to the combination polyol formula of the present invention, the raw materials are listed in Table 1, and the product can be demoulded within 70 seconds to generate low-density fiber-reinforced polyurethane modified polyisocyanurate composite material, plate product Density 300kg / m 3 . The fluidity of the raw material is good, and it has 100% infiltration to the glass fiber. The product has good physical properties, and the properties are listed in Table 2.

[0063] Table 2

[0064] Component (weight)

[0065] Component (weight)

Embodiment 2

[0067] The preparation process of Example 1 was repeated, except that the polyisocyanate had a reactivity index of 160, a glass fiber content of 50%, and a flame retardant content of 21%. When the product is produced according to the combination polyol formula of the present invention, the product can be demolded within 120 seconds, the fluidity of the raw material is good, and the glass fiber has 100% infiltration. The products have good physical properties, the properties are listed in Table 2, and the products can reach the level of flame retardant materials.

Embodiment 3

[0069] The preparation process of Example 1 was repeated, except that the polyisocyanate had a reactivity index of 150 and a glass fiber content of 25%. When the product is produced according to the combination polyol formula of the present invention, the product can be demolded within 120 seconds, the fluidity of the raw material is good, and the glass fiber has 100% infiltration. The product has good physical properties, and the properties are listed in Table 2.

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PUM

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Abstract

The invention discloses a composite material of fiber-reinforced polyurethane polyisocyanurate modified by urethane as well as the preparation method, which is characterized in that the material comprises the products generated by the polyreaction, foaming and solidification of fibrofelt, the composite of polyurethane containing compound polyhydric alcohol poured on the fibrofelt and polyisocyanate, wherein the weight percentages of various components of the polyurethane composite are as follows: the compound polyhydric alcohol accounts for 75% to 96% and foaming agent accounts for 1% to 3%. The invention uses polyhydric alcohol as main material and water as foaming agent, which enables the composite material to have excellent liquidity and realizes fast mold release while achieving outstanding performance; the invention uses the polyhydric alcohol whose molecular hydroxy number is between 2 to 4 and the hydroxyl value between 300 to 700, which reduces the viscosity of the composite and improves the liquidity; in addition, the invention adopts micromolecule polyhydric alcohol, which reduces the viscosity of the composite, improves the liquidity, enhances the intensity of the products used in initial test and enables fast mold release.

Description

technical field [0001] The invention relates to a low-density fiber-reinforced polyurethane composite material and a preparation method thereof. technical background [0002] Low-density fiber-reinforced polyurethane composite material is a new type of fiber composite polymer material. With the requirement of light weight of cars in recent years, polymer composite materials with lower density have attracted more and more attention. The preparation method of reaction injection molding fiber-reinforced polyurethane composite material is to mix other auxiliary agents such as foaming agent, catalyst, silicone oil foam stabilizer and combination polyol uniformly as A component, and use MDI (diphenylmethane diisocyanate) or Its modified body is component B, which uses fiber as a reinforcing material (glass fiber is generally used). After mixing components A and B quickly through reaction injection molding equipment, it is injected into the mold cavity, and components A and B reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08J5/04C08K5/5337B29C70/10B29C70/36B29C70/34B29C70/54C08L83/04
Inventor 刘远中徐强
Owner SHANGHAI HAOHAI CHEM