CN112159615A - Protective coating for aramid composite material, use method thereof and protective coating based on protective coating - Google Patents
Protective coating for aramid composite material, use method thereof and protective coating based on protective coating Download PDFInfo
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- CN112159615A CN112159615A CN202011057441.7A CN202011057441A CN112159615A CN 112159615 A CN112159615 A CN 112159615A CN 202011057441 A CN202011057441 A CN 202011057441A CN 112159615 A CN112159615 A CN 112159615A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- 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
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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- 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
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- 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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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
Abstract
The invention discloses a protective coating for an aramid fiber composite material, a using method thereof and a protective coating based on the protective coating, and belongs to the technical field of aramid fiber composite material protective coatings. The protective coating for the aramid composite material comprises the following raw material components in percentage by mass (14-18) to (8-12): (5-15): (10-20): (15-30), wherein the aramid fiber composite material can be coated on the surface of the aramid fiber composite material by a simple and controllable use method without using a large air circulation oven. The protective coating based on the protective coating for the aramid fiber composite material, which is prepared by curing through the method, is well combined with the aramid fiber composite material substrate, can play a good role in protecting the aramid fiber composite material under the exposure of complex atmosphere and sunlight, and greatly prolongs the service life and stability of the material during the period.
Description
Technical Field
The invention belongs to the technical field of aramid composite protective coatings, and relates to a protective coating for aramid composite materials, a using method thereof and a protective coating based on the protective coating.
Background
Aramid fibers in the aramid composite material are prepared by anisotropic liquid crystal spinning, are sensitive to ultraviolet rays, can be degraded after being exposed to sunlight for a long time, and have great strength loss; on the other hand, the aramid fiber is a polymer of para-phenylene terephthalamide, and due to the structural characteristics, the aramid fiber is poor in water resistance and high in moisture absorption rate, the aramid fiber composite material is degraded, and the performance of the aramid fiber material is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the protective coating for the aramid composite material, the using method thereof and the protective coating based on the protective coating, so that the preparation and the use of the ultraviolet protective coating for the aramid composite material are realized, and the material stability of the aramid composite material in the actual use to ultraviolet and high-humidity environment is improved.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a protective coating for an aramid fiber composite material, which comprises the following raw material components in percentage by mass:
the mass ratio of the epoxy resin, the curing agent, the alumina, the silicon carbide and the silicon dioxide is (14-18): 8-12): 5-15): 10-20): 15-30.
Preferably, the epoxy resin is bisphenol A epoxy resin, and the epoxy equivalent is 175-200 g/mol.
Preferably, the curing agent is an amine curing agent.
Preferably, the alumina is alumina powder with the grain size of 0.02-0.03 mm, the silicon carbide is silicon carbide powder with the grain size of 0.01-0.02 mm, and the silicon dioxide is silicon dioxide powder with the grain size of 0.01-0.02 mm.
The invention discloses a use method of a protective coating for aramid fiber composite materials, which comprises the following steps:
a) preparing a protective coating for the aramid fiber composite material: firstly, uniformly dispersing a curing agent in epoxy resin, then sequentially adding alumina, silicon carbide and silicon dioxide, and uniformly mixing until no blocky substance exists, thus preparing the protective coating for the aramid fiber composite material; wherein the mass ratio of the epoxy resin, the curing agent, the aluminum oxide, the silicon carbide and the silicon dioxide is (14-18): 8-12): 5-15): 10-20): 15-30);
b) surface treatment of aramid fiber composite material: polishing the area to be coated of the aramid fiber composite material, cleaning and drying to obtain the surface-treated aramid fiber composite material;
c) coating of protective coating: uniformly coating the prepared protective coating for the aramid composite material on the aramid composite material after surface treatment in a room temperature environment to obtain a device to be cured;
d) and curing the protective coating for the aramid composite material on the surface of the to-be-cured device to obtain the protective coating for the aramid composite material.
Preferably, in the step a), the temperature of the mixing operation is 18-25 ℃.
Preferably, in the step c), multiple layered coating operations are adopted, and the normal-temperature airing time of each layer is 5-10 min.
Preferably, in the step d), the curing condition is that the mixture is placed at the temperature of (15-35) DEG C for 72-96 h, or placed at the temperature of (36-40) DEG C for 5-8 h.
The invention also discloses a protective coating obtained by the use method, the protective coating is cured on the surface of the aramid fiber composite material, and the protective coating is prepared by mixing and curing epoxy resin, a curing agent, aluminum oxide, silicon carbide and silicon dioxide;
wherein, the epoxy resin: curing agent: alumina: silicon carbide: the mass ratio of the silicon dioxide is (14-18): (8-12): (5-15): 10-20): 15-30).
Preferably, the thickness of the protective coating is (0.2-0.4) mm;
the bonding strength of the protective coating and the aramid fiber composite material is 1.0-2.0 MPa; the product can be maintained for 7 days without aging and failure under ultraviolet irradiation.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a protective coating for an aramid composite material, which can effectively reduce the influence of ultraviolet rays on the aramid composite material by using inorganic filler and utilizing mechanisms such as reflection or diffraction; the protective coating formed after the finally prepared protective coating of the aramid fiber composite material is cured by matching with the epoxy resin has good water resistance, and meanwhile, the adopted epoxy resin and the aramid fiber composite material substrate have good matching performance, so that good binding force can be formed, and the use stability of the protective coating and the matrix material is facilitated. Therefore, the protective coating for the aramid composite material disclosed by the invention can be effectively combined with the aramid composite material, the material performance of the aramid material in ultraviolet and high-humidity use environments is improved, and the service life of an aramid material device is prolonged.
The invention also discloses a using method of the protective coating for the aramid fiber composite material, and the using method is simple to operate. The curing operation does not need a large air circulation oven, and the coating and curing of the protective coating can be simply and quickly realized on the use site with the surface construction capability.
The invention also discloses a protective coating based on the aramid fiber composite material. The protective coating is applicable to ultraviolet and high-humidity environments through any mechanism, and the use protection of the aramid fiber composite material of the matrix is improved. Relevant tests prove that the protective coating has the best effect when the thickness of the protective coating is (0.2-0.4) mm, and the bonding strength of the protective coating and the aramid fiber composite material can reach (0.1-2.0) MPa, so that the aramid fiber composite material can be well protected under the exposure of complex atmosphere and sunlight, and the service life and the stability of the material are greatly improved.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present invention are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention discloses a protective coating for aramid fiber composite material, a using method thereof and a protective coating based on the protective coating, which specifically comprise the following contents:
1. a protective coating for an aramid fiber composite material comprises the following raw material components in percentage by mass:
epoxy resin: curing agent: alumina: silicon carbide: the mass ratio of the silicon dioxide is (14-18): (8-12): (5-15): 10-20): 15-30).
Wherein the epoxy resin is bisphenol A type epoxy resin, and the epoxy equivalent is 175-200 g/mol; the curing agent is an amine curing agent, and specifically an aliphatic amine curing agent can be selected; the alumina is alumina powder with the grain size of 0.02-0.03 mm; the silicon carbide is silicon carbide powder with the particle size of 0.01-0.02 mm; the silicon dioxide is silicon dioxide powder with the particle size of 0.01-0.02 mm.
2. The use method of the protective coating for the aramid fiber composite material specifically comprises the following steps:
the preparation method comprises the steps of preparing a protective coating for the aramid fiber composite material, treating the surface of the aramid fiber composite material, coating the protective coating, obtaining the protective coating based on the aramid fiber composite material after the protective coating is cured, and verifying through a tensile test.
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
(1) the protective coating is composed of epoxy resin (epoxy equivalent is 175-200 g/mol), a curing agent (amine), alumina powder, silicon carbide powder and silicon dioxide powder.
(2) And (3) mixing the epoxy resin: curing agent: alumina powder: silicon carbide powder: weighing the silicon dioxide powder according to the mass ratio of (14-18) to (8-12) to (5-15) to (10-20) to (15-30), fully stirring the epoxy resin and the curing agent by using a glass rod or other tools after weighing, sequentially adding the aluminum oxide powder, the silicon carbide powder and the silicon dioxide powder, and mixing until no blocky substance exists, wherein the preparation environment temperature is 18-25 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair.
Multiple layered coating operations are adopted, and the airing time of each layer is not more than 10 min.
Controlling key parameters of a coating process: because the protective coating is of a room temperature curing type and is easy to flow in the coating process, the thickness of the protective coating is preferably controlled to be (0.2-0.4) mm.
d) Curing the protective coating: and curing the protective coating as required under the condition of specified room temperature under the condition of complete coating and no missing coating.
The curing condition is that the mixture is placed at the temperature of (15-35) DEG C for 72-96 h, or placed at the temperature of (36-40) DEG C for 5-8 h.
Experimental tests show that the thickness of the protective coating prepared by the method is (0.2-0.4) mm.
3. The invention also carries out inspection and tensile test
A button tensile strength test method is established for ensuring the bonding strength of the protective coating and the aramid fiber composite material.
The surface of the protective coating after curing has no defects of missing coating, peeling, cracks and the like, and the non-coating area has no residual protective coating. In order to ensure the bonding strength of the protective coating and the aramid composite material, a tensile strength test of GB/T11211-2009 GB/T11211-. The aramid fiber composite material can protect ultraviolet rays (tested and detected by GJB150.7 military equipment environmental test method solar radiation test) and water vapor (tested and detected by GJB 150.8A-2009 military equipment laboratory environmental test method part 8: rain test), and the aramid fiber composite material is protected.
The present invention is further illustrated by the following specific examples.
Example 1
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
the protective coating is prepared by mixing and curing epoxy resin (epoxy equivalent of 175g/mol), curing agent (aliphatic amine), alumina powder, silicon carbide powder and silicon dioxide powder.
Wherein, the epoxy resin: curing agent: alumina powder: silicon carbide powder: the mass ratio of the silicon dioxide powder is 14: 8: 5: 10: 15, the epoxy resin and the curing agent are sufficiently stirred by a tool such as a glass rod, the alumina powder, the silicon carbide powder and the silicon dioxide powder are sequentially added and mixed until no blocky substance exists, and the preparation environment temperature is 18 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair. Multiple layered coating operations are adopted, and the airing time of each layer is 10 min.
d) Curing the protective coating: and curing the protective coating according to the requirement under the condition of no missing coating after the protective coating is coated, and obtaining the protective coating for the aramid fiber composite material.
The curing conditions were 15 ℃ for 96 h.
Controlling key parameters of a coating process: the protective coating is room temperature curing type and is easy to flow in the coating process, and the thickness of the protective coating obtained by the method is 0.2 mm.
The invention also performs a button tensile strength test of GB/T11211-2009 vulcanized rubber or thermoplastic rubber and metal bonding strength determination two-plate method, and the test shows that the bonding strength of the protective coating and the aramid composite material is 1.0 MPa. The anti-ultraviolet performance and the waterproof performance of the aramid fiber composite material coated with the protective coating are tested, and the test shows that the aramid fiber composite material can bear long-term radiation within the wavelength range of 0.28-3.00 mu m, and can keep 7d from aging and losing efficacy under the irradiation of ultraviolet rays. According to the No. 8 GJB 150.8A-2009 military equipment laboratory environment test method, after the rain test, the coating does not fall off or fall off from the surface of the aramid composite material, so that the coating has good water resistance.
Example 2
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
the protective coating is composed of epoxy resin (epoxy equivalent is 200g/mol), curing agent (aliphatic amine), alumina powder, silicon carbide powder and silicon dioxide powder.
Wherein, the epoxy resin: curing agent: alumina powder: silicon carbide powder: the mass ratio of the silicon dioxide powder is 18: 12: 15: 20: 30, the epoxy resin and the curing agent are sufficiently stirred by a tool such as a glass rod, the alumina powder, the silicon carbide powder and the silicon dioxide powder are sequentially added and mixed until no blocky substance exists, and the preparation environment temperature is 25 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair. Multiple layered coating operations are adopted, and the airing time of each layer is 5 min.
d) Curing the protective coating: and curing the protective coating according to the requirement under the condition of no missing coating after the protective coating is coated, and obtaining the protective coating for the aramid fiber composite material.
The curing condition is that the mixture is placed at 35 ℃ for 72 hours.
Controlling key parameters of a coating process: the protective coating is room temperature curing type and is easy to flow in the coating process, and the thickness of the protective coating obtained by the method is 0.4 mm.
The invention also performs a button tensile strength test of GB/T11211-2009 vulcanized rubber or thermoplastic rubber and metal bonding strength determination two-plate method, and the test shows that the bonding strength of the protective coating and the aramid composite material is 2.0 MPa. The obtained aramid fiber composite material coated with the protective coating is subjected to ultraviolet resistance and waterproof performance tests, and the test shows that the aramid fiber composite material can bear long-term radiation within the wavelength range of 0.28-3.00 mu m, and can keep 7d from aging and failure under ultraviolet irradiation. According to the No. 8 GJB 150.8A-2009 military equipment laboratory environment test method, after the rain test, the coating does not fall off or fall off from the surface of the aramid composite material, so that the coating has good water resistance.
Example 3
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
the protective coating is composed of epoxy resin (epoxy equivalent is 185g/mol), curing agent (aliphatic amine), alumina powder, silicon carbide powder and silicon dioxide powder.
Wherein, the epoxy resin: curing agent: alumina powder: silicon carbide powder: the mass ratio of the silicon dioxide powder is 16: 10: 10: 15: 20, the epoxy resin and the curing agent are sufficiently stirred by a tool such as a glass rod, the alumina powder, the silicon carbide powder and the silicon dioxide powder are sequentially added and mixed until no blocky substance exists, and the preparation environment temperature is 20 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair. Multiple layered coating operations are adopted, and the airing time of each layer is 8 min.
d) Curing the protective coating: and curing the protective coating according to the requirement under the condition of no missing coating after the protective coating is coated, and obtaining the protective coating for the aramid fiber composite material.
The curing condition is that the mixture is placed at 20 ℃ for 80 h.
Controlling key parameters of a coating process: the protective coating is room temperature curing type and is easy to flow in the coating process, and the thickness of the protective coating obtained by the method is 0.3 mm.
The invention also performs a button tensile strength test of GB/T11211-2009 vulcanized rubber or thermoplastic rubber and metal bonding strength determination two-plate method, and the test shows that the bonding strength of the protective coating and the aramid composite material is 1.4 MPa. The obtained aramid fiber composite material coated with the protective coating is subjected to ultraviolet resistance and waterproof performance tests, and the test shows that the aramid fiber composite material can bear long-term radiation within the wavelength range of 0.28-3.00 mu m, and can keep 7d from aging and failure under ultraviolet irradiation. According to the No. 8 GJB 150.8A-2009 military equipment laboratory environment test method, after the rain test, the coating does not fall off or fall off from the surface of the aramid composite material, so that the coating has good water resistance.
Example 4
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
the protective coating is composed of epoxy resin (epoxy equivalent is 185g/mol), curing agent (aliphatic amine), alumina powder, silicon carbide powder and silicon dioxide powder.
Wherein, the epoxy resin: curing agent: alumina powder: silicon carbide powder: the mass ratio of the silicon dioxide powder is 18: 10: 15: 15: 20, the epoxy resin and the curing agent are sufficiently stirred by a tool such as a glass rod, the alumina powder, the silicon carbide powder and the silicon dioxide powder are sequentially added and mixed until no blocky substance exists, and the preparation environment temperature is 22 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair. Multiple layered coating operations are adopted, and the airing time of each layer is 6 min.
d) Curing the protective coating: and curing the protective coating according to the requirement under the condition of no missing coating after the protective coating is coated, and obtaining the protective coating for the aramid fiber composite material.
The curing condition is that the mixture is placed for 5 hours at 40 ℃.
Controlling key parameters of a coating process: the protective coating is room temperature curing type and is easy to flow in the coating process, and the thickness of the protective coating obtained by the method is 0.2 mm.
The invention also performs a button tensile strength test of GB/T11211-2009 vulcanized rubber or thermoplastic rubber and metal bonding strength determination two-plate method, and the test shows that the bonding strength of the protective coating and the aramid composite material is 1.8 MPa. The obtained aramid fiber composite material coated with the protective coating is subjected to ultraviolet resistance and waterproof performance tests, and the test shows that the aramid fiber composite material can bear long-term radiation within the wavelength range of 0.28-3.00 mu m, and can keep 7d from aging and failure under ultraviolet irradiation. According to the No. 8 GJB 150.8A-2009 military equipment laboratory environment test method, after the rain test, the coating does not fall off or fall off from the surface of the aramid composite material, so that the coating has good water resistance.
Example 5
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
the protective coating is composed of epoxy resin (epoxy equivalent is 180g/mol), curing agent (aliphatic amine), alumina powder, silicon carbide powder and silicon dioxide powder.
Wherein, the epoxy resin: curing agent: alumina powder: silicon carbide powder: the mass ratio of the silicon dioxide powder is 14: 12: 15: 15: 15, the epoxy resin and the curing agent are sufficiently stirred by a tool such as a glass rod, the alumina powder, the silicon carbide powder and the silicon dioxide powder are sequentially added and mixed until no blocky substance exists, and the preparation environment temperature is 18 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair. Multiple layered coating operations are adopted, and the airing time of each layer is 10 min.
d) Curing the protective coating: and curing the protective coating according to the requirement under the condition of no missing coating after the protective coating is coated, and obtaining the protective coating for the aramid fiber composite material.
The curing condition is that the mixture is placed for 8 hours at 36 ℃.
Controlling key parameters of a coating process: the protective coating is room temperature curing type and is easy to flow in the coating process, and the thickness of the protective coating obtained by the method is 0.2 mm.
The invention also performs a button tensile strength test of GB/T11211-2009 vulcanized rubber or thermoplastic rubber and metal bonding strength determination two-plate method, and the test shows that the bonding strength of the protective coating and the aramid composite material is 1.0 MPa. The obtained aramid fiber composite material coated with the protective coating is subjected to ultraviolet resistance and waterproof performance tests, and the test shows that the aramid fiber composite material can bear long-term radiation within the wavelength range of 0.28-3.00 mu m, and can keep 7d from aging and failure under ultraviolet irradiation. According to the No. 8 GJB 150.8A-2009 military equipment laboratory environment test method, after the rain test, the coating does not fall off or fall off from the surface of the aramid composite material, so that the coating has good water resistance.
Example 6
a) The preparation method of the aramid fiber composite material protective coating comprises the following steps:
the protective coating is composed of epoxy resin (epoxy equivalent is 195g/mol), curing agent (aliphatic amine), alumina powder, silicon carbide powder and silicon dioxide powder.
Wherein, the epoxy resin: curing agent: alumina powder: silicon carbide powder: the mass ratio of the silicon dioxide powder is 14: 8: 15: 15: 20, the epoxy resin and the curing agent are sufficiently stirred by a tool such as a glass rod, the alumina powder, the silicon carbide powder and the silicon dioxide powder are sequentially added and mixed until no blocky substance exists, and the preparation environment temperature is 18 ℃.
b) Surface treatment of aramid fiber composite material: and (3) polishing the to-be-coated area of the aramid fiber composite material by using sand paper to remove a fiber surface resin layer, and cleaning by using an organic solvent so as to prevent the surface dirt from influencing the bonding strength of the protective coating and the composite material.
c) Coating of protective coating: and (3) coating a protective coating on the to-be-coated area of the aramid fiber composite material by using a hairbrush which does not fall hair. Multiple layered coating operations are adopted, and the airing time of each layer is 10 min.
d) Curing the protective coating: and curing the protective coating according to the requirement under the condition of no missing coating after the protective coating is coated, and obtaining the protective coating for the aramid fiber composite material.
The curing conditions were 37 ℃ for 7 h.
Controlling key parameters of a coating process: the protective coating is room temperature curing type and is easy to flow in the coating process, and the thickness of the protective coating obtained by the method is 0.2 mm.
The invention also performs a button tensile strength test of GB/T11211-2009 vulcanized rubber or thermoplastic rubber and metal bonding strength determination two-plate method, and the test shows that the bonding strength of the protective coating and the aramid composite material is 1.0 MPa. The obtained aramid fiber composite material coated with the protective coating is subjected to ultraviolet resistance and waterproof performance tests, and the test shows that the aramid fiber composite material can bear long-term radiation within the wavelength range of 0.28-3.00 mu m, and can keep 7d from aging and failure under ultraviolet irradiation. According to the No. 8 GJB 150.8A-2009 military equipment laboratory environment test method, after the rain test, the coating does not fall off or fall off from the surface of the aramid composite material, so that the coating has good water resistance.
Specifically, in the above examples, the epoxy resin used was designated as E44 or E51, and an aliphatic amine-based curing agent such as ethylenediamine or D-8 was used.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The protective coating for the aramid composite material is characterized in that the protective coating comprises the following raw material components in percentage by mass:
the mass ratio of the epoxy resin, the curing agent, the alumina, the silicon carbide and the silicon dioxide is (14-18): 8-12): 5-15): 10-20): 15-30.
2. The protective coating for the aramid composite material as claimed in claim 1, wherein the epoxy resin is bisphenol A type epoxy resin and has an epoxy equivalent weight of 175-200 g/mol.
3. The protective coating for the aramid composite material as claimed in claim 1, wherein the curing agent is an amine curing agent.
4. The protective coating for the aramid composite material as claimed in claim 1, wherein the alumina is alumina powder with a particle size of 0.02-0.03 mm, the silicon carbide is silicon carbide powder with a particle size of 0.01-0.02 mm, and the silicon dioxide is silicon dioxide powder with a particle size of 0.01-0.02 mm.
5. The use method of the protective coating for the aramid composite material based on any one of claims 1 to 4 is characterized by comprising the following steps of:
a) preparing a protective coating for the aramid fiber composite material: firstly, uniformly dispersing a curing agent in epoxy resin, then sequentially adding alumina, silicon carbide and silicon dioxide, and uniformly mixing until no blocky substance exists, thus preparing the protective coating for the aramid fiber composite material; wherein the mass ratio of the epoxy resin, the curing agent, the aluminum oxide, the silicon carbide and the silicon dioxide is (14-18): 8-12): 5-15): 10-20): 15-30);
b) surface treatment of aramid fiber composite material: polishing the area to be coated of the aramid fiber composite material, cleaning and drying to obtain the surface-treated aramid fiber composite material;
c) coating of protective coating: uniformly coating the prepared protective coating for the aramid composite material on the aramid composite material after surface treatment in a room temperature environment to obtain a device to be cured;
d) and curing the protective coating for the aramid composite material on the surface of the to-be-cured device to obtain the protective coating for the aramid composite material.
6. The method according to claim 5, wherein the mixing temperature in step a) is 18 to 25 ℃.
7. The preparation method of claim 5, wherein in the step c), a plurality of layered coating operations are adopted, and the normal-temperature airing time of each layer is 5-10 min.
8. The method according to claim 5, wherein the curing condition in step d) is 72-96 h at (15-35) deg.C or 5-8 h at (36-40) deg.C.
9. The protective coating obtained by the use method of any one of claims 5 to 8 is characterized in that the protective coating is cured on the surface of the aramid composite material, and the protective coating is prepared by mixing and curing epoxy resin, a curing agent, aluminum oxide, silicon carbide and silicon dioxide;
wherein, the epoxy resin: curing agent: alumina: silicon carbide: the mass ratio of the silicon dioxide is (14-18): (8-12): (5-15): 10-20): 15-30).
10. The protective coating of claim 9, wherein the protective coating has a thickness of (0.2-0.4) mm;
the bonding strength of the protective coating and the aramid fiber composite material is 1.0-2.0 MPa; the product can be maintained for 7 days without aging and failure under ultraviolet irradiation.
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