CN116640407A - Continuous fiber reinforced heat-resistant coating material and preparation method thereof - Google Patents

Continuous fiber reinforced heat-resistant coating material and preparation method thereof Download PDF

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Publication number
CN116640407A
CN116640407A CN202310459766.5A CN202310459766A CN116640407A CN 116640407 A CN116640407 A CN 116640407A CN 202310459766 A CN202310459766 A CN 202310459766A CN 116640407 A CN116640407 A CN 116640407A
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coating material
heat
resistant coating
continuous fiber
fiber reinforced
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李盼盼
刘晓丽
陈纲
张彦军
张乐
赵建宇
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Beijing Xinfeng Aerospace Equipment Co Ltd
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Beijing Xinfeng Aerospace Equipment Co Ltd
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
    • C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
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    • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
    • C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
    • C08J2361/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
    • C08J2361/14—Modified phenol-aldehyde condensates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
    • C08J2483/06—Polysiloxanes containing silicon bound to oxygen-containing groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/322—Ammonium phosphate
    • C08K2003/323—Ammonium polyphosphate
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
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    • C08K3/346—Clay
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/10—Silicon-containing compounds
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C08K7/24—Expanded, porous or hollow particles inorganic
    • C08K7/28—Glass

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Abstract

The continuous fiber reinforced heat-resistant coating material comprises continuous fibers and a heat-resistant coating material, and is characterized in that the heat-resistant coating material is used for impregnating the continuous fibers, and the weight ratio of the continuous fibers to the heat-resistant coating material is 1:2-4:5; the heat-resistant coating material comprises the following components in parts by weight: 50-60% of barium phenolic resin, 20-25% of epoxy modified organic silicon resin, 13-20% of hollow glass beads and 5-10% of other heat-resistant fillers; the invention has excellent comprehensive performance, high mechanical strength and good heat-proof and insulating performance.

Description

Continuous fiber reinforced heat-resistant coating material and preparation method thereof
Technical Field
The invention relates to the technical field of high-performance fiber composite materials, in particular to a continuous fiber reinforced heat-resistant coating material and a preparation method thereof.
Background
The fiber reinforced resin matrix composite has the advantages of light weight, high specific strength, good environmental compatibility and the like, and has strong adaptability to load and environmental conditions, so that the fiber reinforced resin matrix composite can be widely applied to the fields of aerospace, transportation, biological medicine and the like. In these applications, the continuous fiber reinforced resin matrix composites have advantages of up to 50% or more due to stable internal fiber arrangement, uniform stress, high accuracy in controlling resin content, low volatile content, and the like.
As continuous fiber reinforced resin matrix composites are increasingly used in primary load bearing structures and heat shielding articles, their size and thickness requirements are continually increasing. However, at present, the domestic continuous fiber reinforced resin matrix composite material only uses resin with lower solid content, has thin single-layer thickness and high density, and the product with high mechanical strength and good heat-proof and heat-insulating performance is required to be obtained, the heat-proof and heat-insulating performance of the product only using resin is poor, the continuous fiber reinforced resin matrix composite material has increased number of layers, so that the density of the product is increased, and operators need to repeatedly pave for many times in the layering process, so that the production efficiency is low.
Disclosure of Invention
The invention aims to solve the problems of the prior continuous fiber reinforced resin matrix composite material and provides a continuous fiber reinforced heat-proof coating material with high heat-proof performance requirements and a preparation method thereof. The invention adopts the technical proposal that on one hand:
the continuous fiber reinforced heat-resistant coating material comprises continuous fibers and a heat-resistant coating material, and is characterized in that the heat-resistant coating material is used for impregnating the continuous fibers, and the weight ratio of the continuous fibers to the heat-resistant coating material is 1:2-4:5;
the heat-resistant coating material comprises the following components in parts by weight:
50-60% of barium phenolic resin, 20-25% of epoxy modified organic silicon resin, 13-20% of hollow glass beads and 5-10% of other heat-resistant fillers;
the other heat-proof filler is one or more of aluminum hydroxide, silicon dioxide, zinc oxide, ammonium polyphosphate, asbestos powder and kaolin;
the continuous fiber is plain cloth or any two kinds of plain cloth made of one of glass fiber, quartz fiber, high silica fiber and aramid fiber, and has surface density of 100-160 g/m 2 Between them;
wherein the solid content in the barium phenolic resin is more than or equal to 60 percent, and the free phenol content is less than or equal to 20 percent; the solid content of the epoxy modified organic silicon resin is more than or equal to 50 percent.
Preferably, the heat-resistant coating material comprises the following components in parts by weight:
55-60% of barium phenolic resin, 23-25% of epoxy modified organic silicon resin, 13-18% of hollow glass beads and 5-8% of other heat-resistant fillers.
Preferably according to the weight ratio: the solid content in the barium phenolic resin is between 60 and 65 percent, and the free phenol content is between 15 and 20 percent.
4 preferably, the solid content of the epoxy modified organic silicon resin is 50-60%.
The hollow glass microsphere is 10-150 mu m, and the density is 0.25-0.6 g/cm 3 The compressive strength is 25-30 MPa.
A method for preparing a continuous fiber reinforced heat protection coating material according to claim 1, comprising the steps of:
step one: and (3) preparing a coating material: weighing barium phenolic resin, epoxy modified organic silicon resin, hollow glass beads and other heat-resistant fillers according to a proportion, firstly mixing and stirring the barium phenolic resin and the epoxy modified organic silicon resin uniformly, and then adding the hollow glass beads and other fillers for full mixing to obtain a heat-resistant coating material;
step two: and (3) preparation of an adhesive film: preparing a thermal protection coating material into a glue film with uniform appearance, controllable thickness and moderate viscosity by using a hot melt glue film machine, determining the temperature of the coating to be 53-57 ℃ according to the curing characteristic and rheological property of the resin, and the speed of the coating to be 5-15 m/min, wherein the thickness of the glue film is 0.2-0.25 mu m;
step three, composite impregnation: and (3) compounding and impregnating the coated adhesive film and the continuous fibers on a hot-melt prepreg machine, respectively attaching the upper adhesive film and the lower adhesive film on two sides of the continuous fiber plain cloth, wherein the prepreg temperature is 65-70 ℃, the prepreg speed is 1-10 m/min, and hot-pressing and impregnating to obtain the continuous fiber reinforced heat-resistant coating material.
7. The method for preparing a continuous fiber reinforced heat-resistant coating material according to claim 6, wherein the volatile content of the prepared continuous fiber reinforced heat-resistant coating material is controlled to be between 5 and 8 percent, and the areal density is controlled to be between 300 and 360g/m 2 The thickness of the single layer is between 0.4 and 0.7 mu m.
Compared with the prior art, the invention has the beneficial effects that:
(1) The density of the continuous fiber reinforced heat-proof coating material product obtained by the method is 0.90-0.95 g/cm 3 The heat conductivity is less than or equal to 0.25W/(m.K), the specific heat capacity is more than or equal to 1.0J/(kg.K), the shearing strength is more than or equal to 40MPa, the tensile strength is more than or equal to 25MPa, and the bending strength is more than or equal to 50 MPa.
(2) The invention is suitable for common hot melt adhesive film machine and hot melt prepreg machine equipment, can remarkably improve the production efficiency, has the advantages of simple process, low equipment requirement, easy operation and the like, is suitable for large-scale popularization and use, and has good application value and economic benefit in the technical field of continuous fiber reinforced resin matrix composite material manufacturing.
Detailed Description
A continuous fiber reinforced thermal protective coating material comprising continuous fibers and a thermal protective coating material to impregnate the continuous fibers. The weight ratio of the continuous fiber to the heat-resistant coating material is 1:2-4:5.
Further, the heat-resistant coating material is prepared from the following raw materials in parts by weight:
50-60% of barium phenolic resin, 20-25% of epoxy modified organic silicon resin, 13-20% of hollow glass beads and 5-10% of other heat-resistant fillers;
the solid content of the barium phenolic resin is more than or equal to 60 percent, and the free phenol content is less than or equal to 20 percent;
the solid content of the epoxy modified organic silicon resin is more than or equal to 50%;
the hollow glass microsphere is 10-150 mu m, and the density is 0.25-0.6 g/cm 3 Compressive strength is 25-30 MPa;
the other heat-proof filler is at least one of aluminum hydroxide, silicon dioxide, zinc oxide, ammonium polyphosphate, asbestos powder and kaolin.
Further, the continuous fiber is glass fiber, quartz fiber, high silica fiber, aramid fiber plain cloth or mixed plain cloth of any two of the above fibers, and the surface density is 100-160 g/m 2 。
In another aspect of the present invention, there is also provided a method for preparing a continuous fiber-reinforced heat-resistant coating material, comprising the steps of:
step 1: and (3) preparing a coating material: weighing barium phenolic resin, epoxy modified organic silicon resin, hollow glass beads and other heat-resistant fillers according to a proportion, uniformly stirring the two resins, and then adding the hollow glass beads and other fillers to be fully mixed to obtain a heat-resistant coating material;
step 2: and (3) preparation of an adhesive film: the thermal protection coating material is prepared into a glue film with uniform appearance, controllable thickness and moderate viscosity by using a hot melt glue film machine, the temperature of the film is determined to be (55+/-2) DEG C according to the curing characteristic and rheological property of the resin, the film coating speed is 5-15 m/min, and the thickness of the glue film is 0.2-0.25 mu m.
Step 3: composite impregnation: the coated adhesive film and the continuous fiber are compositely impregnated on a hot-melt prepreg machine, the upper adhesive film and the lower adhesive film are respectively attached to the two sides of the continuous fiber plain cloth, the prepreg temperature range is (65+/-5), the prepreg speed is 1-10 m/min, the continuous fiber reinforced heat-proof coating material is obtained by hot-press impregnation, the volatile content is 5-8%, and the surface density is 300-360 g/m 2 The thickness of the single layer is 0.4-0.7 mu m.
Example 1:
the continuous fiber reinforced heat-resistant coating material provided by the embodiment comprises the following raw materials in parts by weight: 55% of barium phenolic resin, 23% of epoxy modified organic silicon resin, 18% of hollow glass beads, and 7% of aluminum hydroxide, silicon dioxide and ammonium polyphosphate; the continuous fiber has an areal density of 160g/m 2 Is a glass fiber plain cloth.
The preparation method comprises the following steps:
step 1: and (3) preparing a coating material: weighing barium phenolic resin, epoxy modified organic silicon resin, hollow glass beads, aluminum hydroxide, silicon dioxide and ammonium polyphosphate according to a proportion, uniformly stirring the two resins, and then adding the hollow glass beads and other fillers for full mixing to obtain a heat-resistant coating material;
step 2: and (3) preparation of an adhesive film: the heat-proof coating material is prepared into a glue film with uniform appearance, controllable thickness and moderate viscosity by a hot melt glue film machine, the temperature of the film is determined to be (55+/-2) DEG C according to the curing characteristic and rheological property of the resin, the film coating speed is 5-10 m/min, the thickness of the glue film is 0.2-0.25 mm, and the surface density is 100g/m 2 。
Step 3: composite impregnation: the coated adhesive film and the continuous fiber are compositely impregnated on a hot-melt prepreg machine, the two adhesive films are respectively attached to two sides of the continuous fiber plain cloth, the prepreg temperature range is (65+/-2), the prepreg speed is 5-7 m/min, and the continuous fiber reinforced heat-proof coating material is obtained by hot-press impregnation, wherein the volatile content is 5-7%, and the areal density is 360g/m 2 The thickness of the single layer is 0.6-0.7 mu m.
By hot pressingTank solidifying process to form composite laminated board, which is formed by paving 10 layers of continuous fiber reinforced heat-proof coating material, vacuum-pumping and heat-preserving at 150 ℃ and 0.3MPa for 120min, cooling and demoulding to obtain laminated board with density of 0.94g/cm 3 The thermal conductivity was 0.18W/(m.K), the specific heat capacity was 1.1J/(kg.K), the shear strength was 43.5MPa, the tensile strength was 27.5MPa, and the flexural strength was 53.2MPa.
Example 2:
the raw material components of the continuous fiber reinforced heat-resistant coating material provided by the embodiment comprise 58% of barium phenolic resin, 25% of epoxy modified organic silicon resin, 15% of hollow glass beads, and 5% of silicon dioxide, zinc oxide and asbestos powder; the continuous fiber has an areal density of 100g/m 2 Is made of glass fiber and quartz fiber.
The preparation method comprises the following steps:
step 1: and (3) preparing a coating material: weighing barium phenolic resin, epoxy modified organic silicon resin, hollow glass beads, silicon dioxide, zinc oxide and asbestos powder according to a proportion, uniformly stirring the two resins, and then adding the hollow glass beads and other fillers for full mixing to obtain a heat-resistant coating material;
step 2: and (3) preparation of an adhesive film: the heat-proof coating material is prepared into a glue film with uniform appearance, controllable thickness and moderate viscosity by a hot melt glue film machine, the temperature of the film is determined to be (53-55) DEG C according to the curing characteristic and rheological property of the resin, the film coating speed is 8-10 m/min, the thickness of the glue film is 0.2-0.25 mm, and the surface density is 100g/m 2 。
Step 3: composite impregnation: the coated adhesive film and the continuous fiber are compositely impregnated on a hot-melt prepreg machine, the two adhesive films are respectively attached to two sides of the continuous fiber plain cloth, the prepreg temperature range is (63-65), the prepreg speed is 8-10 m/min, and the continuous fiber reinforced heat-proof coating material is obtained by hot-press impregnation, the volatile content is 6-8%, and the surface density is 300g/m 2 The thickness of the single layer is 0.4-0.5 mu m.
The composite material laminated board is formed by adopting an autoclave curing process, and the laminated board is formed by paving 10 layers of continuous fiber reinforced heat-proof coating materials, and is at 150 ℃ and 0.3MPaVacuum-pumping under pressure, maintaining for 120min, cooling, and demoulding to obtain laminated board with density of 0.91g/cm 3 The thermal conductivity was 0.17W/(m.K), the specific heat capacity was 1.2J/(kg.K), the shear strength was 42.5MPa, the tensile strength was 30.8MPa, and the flexural strength was 54.5MPa.
Example 3:
the continuous fiber reinforced heat-resistant coating material provided by the embodiment comprises the following raw materials of 60% of barium phenolic resin, 24% of epoxy modified organic silicon resin, 15% of hollow glass beads, and 5% of ammonium polyphosphate, silicon dioxide and kaolin in total; the continuous fiber adopts the surface density of 120g/m 2 The aramid fiber and the glass fiber are mixed and woven into the plain cloth.
The preparation method comprises the following steps:
step 1: and (3) preparing a coating material: weighing barium phenolic resin, epoxy modified organic silicon resin, hollow glass beads, silicon dioxide, zinc oxide and asbestos powder according to a proportion, uniformly stirring the two resins, and then adding the hollow glass beads and other fillers for full mixing to obtain a heat-resistant coating material;
step 2: and (3) preparation of an adhesive film: the thermal protection coating material is prepared into a glue film with uniform appearance, controllable thickness and moderate viscosity by using a hot melt glue film machine, the temperature of the film is determined to be (55-57) DEG C according to the curing characteristic and rheological property of the resin, the film coating speed is 12-15 m/min, the thickness of the glue film is 0.2-0.25 mm, and the surface density is 100g/2m.
Step 3: composite impregnation: the coated adhesive film and the continuous fiber are compositely impregnated on a hot-melt prepreg machine, the two adhesive films are respectively attached to two sides of the continuous fiber plain cloth, the prepreg temperature range is 68-70 ℃, the prepreg speed is 8-10 m/min, and the continuous fiber reinforced heat-proof coating material is obtained by hot-press impregnation, the volatile content is 5-7%, and the surface density is 320g/m 2 The thickness of the single layer is 0.4-0.5 mu m.
The composite material laminated board is formed by adopting an autoclave curing process, the laminated board is formed by paving 10 layers of continuous fiber reinforced heat-resistant coating materials, vacuumizing and preserving heat for 120min at 150 ℃ and 0.3MPa, cooling and demolding to obtain the laminated board with the density of 0.92g/cm 3 The thermal conductivity was 0.18W/(m.K), the specific heat capacity was 1.1J/(kg.K), the shear strength was 45.3MPa, the tensile strength was 29.0MPa, and the flexural strength was 51.5MPa.
The continuous fiber reinforced heat-resistant coating material and the preparation method thereof have a plurality of advantages for the technicians in the same industry nowadays.
While the invention has been described in terms of what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. The continuous fiber reinforced heat-resistant coating material comprises continuous fibers and a heat-resistant coating material, and is characterized in that the heat-resistant coating material is used for impregnating the continuous fibers, and the weight ratio of the continuous fibers to the heat-resistant coating material is 1:2-4:5;
the heat-resistant coating material comprises the following components in parts by weight:
50-60% of barium phenolic resin, 20-25% of epoxy modified organic silicon resin, 13-20% of hollow glass beads and 5-10% of other heat-resistant fillers;
the other heat-proof filler is one or more of aluminum hydroxide, silicon dioxide, zinc oxide, ammonium polyphosphate, asbestos powder and kaolin;
the continuous fiber is plain cloth or any two kinds of plain cloth made of one of glass fiber, quartz fiber, high silica fiber and aramid fiber, and has surface density of 100-160 g/m 2 Between them;
wherein the solid content in the barium phenolic resin is more than or equal to 60 percent, and the free phenol content is less than or equal to 20 percent; the solid content of the epoxy modified organic silicon resin is more than or equal to 50 percent.
2. The continuous fiber reinforced heat-resistant coating material according to claim 1, wherein the heat-resistant coating material comprises the following components in parts by weight:
55-60% of barium phenolic resin, 23-25% of epoxy modified organic silicon resin, 13-18% of hollow glass beads and 5-8% of other heat-resistant fillers.
3. A continuous fiber reinforced heat protective coating material according to claim 1 or 2, wherein the weight ratio is: the solid content in the barium phenolic resin is between 60 and 65 percent, and the free phenol content is between 15 and 20 percent.
4. A continuous fiber reinforced heat protective coating material according to claim 1 or 2, wherein the weight ratio is: the solid content of the epoxy modified organic silicon resin is between 50% and 60%.
5. The continuous fiber-reinforced heat-resistant coating material according to claim 1 or 2, wherein the hollow glass beads have a density of 0.25 to 0.6g/cm and a density of 10 to 150 μm 3 The compressive strength is 25-30 MPa.
6. A method for preparing a continuous fiber reinforced heat protection coating material according to claim 1, comprising the steps of:
step one: and (3) preparing a coating material: weighing barium phenolic resin, epoxy modified organic silicon resin, hollow glass beads and other heat-resistant fillers according to a proportion, firstly mixing and stirring the barium phenolic resin and the epoxy modified organic silicon resin uniformly, and then adding the hollow glass beads and other fillers for full mixing to obtain a heat-resistant coating material;
step two: and (3) preparation of an adhesive film: preparing a thermal protection coating material into a glue film with uniform appearance, controllable thickness and moderate viscosity by using a hot melt glue film machine, determining the temperature of the coating to be 53-57 ℃ according to the curing characteristic and rheological property of the resin, and the speed of the coating to be 5-15 m/min, wherein the thickness of the glue film is 0.2-0.25 mu m;
step three, composite impregnation: and (3) compounding and impregnating the coated adhesive film and the continuous fibers on a hot-melt prepreg machine, respectively attaching the upper adhesive film and the lower adhesive film on two sides of the continuous fiber plain cloth, wherein the prepreg temperature is 65-70 ℃, the prepreg speed is 1-10 m/min, and hot-pressing and impregnating to obtain the continuous fiber reinforced heat-resistant coating material.
7. The method for preparing a continuous fiber reinforced heat-resistant coating material according to claim 6, wherein the volatile content of the prepared continuous fiber reinforced heat-resistant coating material is controlled to be between 5 and 8 percent, and the areal density is controlled to be between 300 and 360g/m 2 The thickness of the single layer is between 0.4 and 0.7 mu m.
CN202310459766.5A 2023-04-26 2023-04-26 Continuous fiber reinforced heat-resistant coating material and preparation method thereof Pending CN116640407A (en)

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