Carbon fiber honeycomb reinforced polyimide foam material and preparation method thereof

A technology of polyimide and foam materials, which is applied in the field of modified polyimide foam materials and its preparation, can solve the problems of high production cost and poor mechanical properties of polyimide foam materials, and achieve good sound absorption , good flame retardancy and high mechanical properties

Active Publication Date: 2016-08-03
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a carbon fiber honeycomb reinforced polyimide foam material and its preparation method to solve the problems of high production cost and poor mechanical properties of polyimide foam material

Method used

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  • Carbon fiber honeycomb reinforced polyimide foam material and preparation method thereof
  • Carbon fiber honeycomb reinforced polyimide foam material and preparation method thereof
  • Carbon fiber honeycomb reinforced polyimide foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of carbon fiber honeycomb material.

[0032] The carbon fiber honeycomb material used in the present invention is formed by laying carbon fiber prepreg in a mold and pressing it once, and its structure is as follows: figure 2 shown. The mold used comprises a semi-hexagonal mold 1 and a hexagonal core mold 2 for forming honeycomb holes, such as image 3 with Figure 4 shown. The hexagonal prism mandrel 2 is a prism whose end face is a regular hexagon, and its material is aluminum alloy or stainless steel. The semi-hexagonal mold 1 is provided with several identical strip-shaped convex ribs on its upper surface, and the end face of the convex ribs is trapezoidal. The same two parts are called half hexagonal prisms, and the shape and size of the convex ribs are the same as those of the half hexagonal prisms. A groove is formed between two adjacent ribs, the groove matches the half hexagonal prism, and is used for embedding the lower half of the...

Embodiment 2

[0040] Example 2: Preparation of carbon fiber honeycomb reinforced polyimide foam material.

[0041] Preparation of polyimide prepolymer powder: the molar ratio of BTDA to BPDA is 6:4.

[0042]Add 120g of methanol into a four-neck flask equipped with a stirrer, reflux condenser and thermometer, and heat it under stirring until the methanol begins to reflux, then slowly add 30g of BTDA to make BTDA and methanol react for 1.5 hours under reflux, and the system is formed by suspension The solution gradually turned into a transparent light yellow solution, that is, a dimethyl 3,3',4,4'-benzophenone tetracarboxylate solution was obtained.

[0043] Add 73.04g of methanol into a four-neck flask equipped with a stirrer, reflux condenser and thermometer, and heat it under stirring until the methanol begins to reflux, then slowly add 18.26g of BPDA to react BPDA and methanol for 10.0h under reflux, and the system The suspension gradually turns into a transparent light yellow solution, ...

Embodiment 3

[0048] Example 3: Preparation of carbon fiber honeycomb reinforced polyimide foam material.

[0049] Preparation of polyimide prepolymer powder: The molar ratio of BTDA to BPDA is 2:1.

[0050] Add 80g of methanol into a four-neck flask equipped with a stirrer, reflux condenser and thermometer, and heat it under stirring until the methanol begins to reflux, then slowly add 20g of BTDA to make BTDA and methanol react for 1.5 hours under reflux, and the system starts to reflux. The solution gradually turned into a transparent light yellow solution, that is, a dimethyl 3,3',4,4'-benzophenone tetracarboxylate solution was obtained.

[0051] Add 36.5g of methanol into a four-necked flask equipped with a stirrer, reflux condenser and thermometer, and heat it under stirring until the methanol begins to reflux, then slowly add 9.13g of BPDA to react BPDA and methanol for 10.0h under reflux, and the system The suspension gradually turns into a transparent light yellow solution, that i...

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Abstract

The invention provides a carbon fiber honeycomb reinforced polyimide foam material and a preparation method thereof. The foam material is obtained through a reaction of polyimide prepolymer powder and a carbon fiber honeycomb material. A preparation method of the polyimide prepolymer powder comprises the steps that BTDA and methyl alcohol are reacted for 1.5-2.5 h in a backflow state to prepare a 3,3',4,4'-benzophenone tetramethyl acid dimethyl ester solution, BPDA and methyl alcohol are reacted for 10-11 h in a backflow state to obtain a 3,3',4,4'-biphenyl tetracarboxylic acid dimethyl ester solution, the obtained 3,3',4,4'-benzophenone tetramethyl acid dimethyl ester solution and the obtained 3,3',4,4'-biphenyl tetracarboxylic acid dimethyl ester solution are mixed, MDA is added into the mixture, stirring is performed at room temperature for 0.5-1 h, a foam stabilizer is added, stirring continues to be performed for 0.5-3 h, a polyimide prepolymer solution is prepared, and the polyimide prepolymer solution is dried to obtain the polyimide prepolymer powder, wherein the mole ratio of the BTDA to the BPDA is (6-8):(2-4). The carbon fiber honeycomb reinforced polyimide foam material has uniform foam holes and quite high mechanical property and is low in production cost.

Description

technical field [0001] The invention relates to a modified polyimide foam material and a preparation method thereof, in particular to a carbon fiber honeycomb reinforced polyimide foam material and a preparation method thereof. Background technique [0002] Polyimide is a kind of heat-resistant polymer material with excellent comprehensive performance. It not only has high thermal performance, mechanical performance and chemical stability, but also has low dielectric constant and thermal expansion coefficient. Polyimide foam not only has the characteristics of light weight and low density, but also has incomparable heat resistance, flame retardancy and dimensional stability of polyurethane foam, polyethylene foam and polystyrene foam. Aerospace is highly valued and used as thermal and acoustic insulation for various aircraft. However, the production cost of polyimide foam is high, and the uniformity of foam is difficult to control, which limits the popularization and applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L83/04C08L83/12C08K7/06C08G73/10B29C70/38B29C44/60B29C33/00
CPCB29C33/0088B29C44/60B29C70/38C08G73/1007C08G73/1067C08L79/08C08L2201/02C08L2201/08C08L2203/14C08L83/04C08L83/12C08K7/06
Inventor 肖继君王美美于志平仇晓龙孙耶楠赵灿
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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