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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, destruction, and fluidity decline, so as to improve fluidity and reduce viscosity , the effect of increasing the strength of the initial test

Inactive Publication Date: 2008-05-14
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

[0061] 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.

[0062] Table 2

[0063] Component (weight)

Embodiment 2

[0065] 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

[0067] 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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Abstract

The invention discloses a fiber reinforced polyurethane modified polyisocyanurate composite material and a preparation method thereof. It is characterized in that it is composed of a fiber mat and a polyisocyanate-containing polyurethane composition poured on the fiber mat, foamed and cured. Among the components of the polyurethane composition, The weight of the polyurethane composite material includes 75%-96% of combined polyalcohol and 1%-3% of foaming agent. The invention adopts polyol as the main raw material and water as the foaming agent, so that the composite material has good fluidity while having excellent characteristics, and can be demolded quickly; the molecular hydroxyl number is between 2 and 4, Polyols with a hydroxyl value between 300 and 700 can reduce the viscosity of the composite material and improve fluidity. The use of small molecular polyols can reduce the viscosity of the composite material, improve fluidity, and increase the initial strength of the product, which can be quickly released from the mold. .

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