Unlock instant, AI-driven research and patent intelligence for your innovation.

Honeycomb reinforced thermosetting rigid closed-cell polyimide foam composite material and its preparation method and application

A technology of polyimide and composite materials, which is applied in the field of honeycomb reinforced thermosetting rigid closed-cell polyimide foam composite materials and its preparation and application, and can solve the problem of obtaining polyimide with high closed-cell rate and anti-compression strength Foam materials, softening and deformation of formed cells, high curing temperature, etc., to achieve the effects of improving mechanical strength, preventing intrusion, and high closed cell rate

Active Publication Date: 2018-08-14
INST OF CHEM CHINESE ACAD OF SCI
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the curing temperature of phenylethynyl-terminated polyimide resin is as high as 370°C, it is easy to cause softening and deformation of formed cells, so it is difficult to obtain polyimide foam materials with high closed cell rate and high compressive strength.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Honeycomb reinforced thermosetting rigid closed-cell polyimide foam composite material and its preparation method and application
  • Honeycomb reinforced thermosetting rigid closed-cell polyimide foam composite material and its preparation method and application
  • Honeycomb reinforced thermosetting rigid closed-cell polyimide foam composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1) Add 64g of tetraacid dianhydride α-BTDA and 80g of low boiling point solvent absolute ethanol into a three-neck flask equipped with a mechanical stirrer, a spherical reflux condenser and a thermometer, and heat and reflux for 3 hours under stirring to obtain aromatic Homogeneous solution of diacid diester.

[0046] 2) Add 24g of reactive end-capping agent NA and 55g of low boiling point solvent anhydrous ethanol into a single-necked bottle equipped with an electromagnetic stirring device and a spherical reflux condenser, and heat for 3 hours under stirring conditions to obtain the reactive end-capping agent Monoacid monoester homogeneous solution, cooled to room temperature;

[0047] 3) Add the monoacid monoester homogeneous solution of reactive end-capping agent obtained in step 2) to the homogeneous solution of aromatic diacid diester obtained in step 1), and add 30g of aromatic diamine m-PDA, 0.26 g imidization accelerator isoquinoline, heated under reflux for 15...

Embodiment 2

[0053] According to the steps of Example 1, only the mass of the polyimide precursor resin solid powder used in step 5) is replaced by 20g to 30g, and the mass of the aluminum honeycomb structure material is replaced by 13g to obtain the honeycomb reinforced thermosetting hard solid powder provided by the present invention. Closed cell polyimide foam composite.

[0054] The composite material has a density of 200kg / m 3 , the normal temperature compressive strength is 4.4MPa, the high temperature compressive strength at 320°C is 2.4MPa, and the compressive deformation rate at 320°C / 0.5MPa / 2h is 1.8%. The specific properties of the materials are listed in Table 2.

Embodiment 3

[0056] According to the steps of Example 1, only the mass of the polyimide precursor resin solid powder used in step 5) is replaced by 20g to 40g, and the mass of the aluminum honeycomb structure material is replaced by 13g to obtain the honeycomb reinforced thermosetting hard solid powder provided by the present invention. Closed cell polyimide foam composite.

[0057] The composite material has a density of 250kg / m 3 , the normal temperature compressive strength is 6.5MPa, the high temperature compressive strength at 320°C is 3.6MPa, and the compression set rate at 320°C / 0.5MPa / 2h is 0.9%. The specific properties of the materials are listed in Table 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
densityaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a cellular reinforcement thermosetting hard closed-cell polyimide foam composite material as well as a preparation method and application thereof. The composite material is obtained by performing in-situ field condensation polymerization between polyimide precursor powder and a cellular material. When the density of the composite material is less than 200kg / m<3>, the compressive deformation rate is less than 2% after 2 hours of constant temperature treatment under the condition that the temperature is 320 DEG C and the pressure is 0.5 MPa, and process conditions for autoclave forming of a high-temperature composite material can be met. The cellular reinforcement thermosetting hard closed-cell polyimide foam composite material has the advantages of high-temperature resistance, high porosity by closed pore, excellent high-temperature compression resistance, good weathering resistance and fatigue resistance and the like, can be used as a core material for direct autoclave forming of a polyimide / carbon fiber composite material sandwich structure, and can also be used for preparing high-temperature-resistant sound-absorbing materials, high-temperature-resistant wave-transparent materials and high-temperature-resistant heat insulating materials.

Description

technical field [0001] The invention relates to a honeycomb reinforced thermosetting rigid closed-cell polyimide foam composite material and a preparation method and application thereof. Background technique [0002] Polyimide foam has excellent comprehensive properties such as high temperature resistance, low temperature resistance, low dielectric constant, low dielectric loss, and intrinsic flame retardancy. It can be used as heat insulation, sound absorption or flame retardant materials, and can also be used as carbon fiber Or the sandwich material of glass / quartz fiber composite sandwich structure has broad application prospects in high-tech industries such as aviation, aerospace, ships, and high-speed trains. According to different chemical structures, polyimide foam materials can be divided into two categories: thermoplastic and thermosetting. Weiser et al. (Proc.43rd Int.SAMPE Symp., May31, 1998, P730-44; High Perform.Polym., 2000, 12, 1-12; US4241193, EP0437821B1) w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08L77/10C08L61/06C08G73/12C08K3/08C08K3/00C08K3/36C08J9/00
Inventor 杨士勇李姝姝胡爱军范琳
Owner INST OF CHEM CHINESE ACAD OF SCI