CN113527841A - Internal reinforcing plate of foaming box plate and processing technology thereof - Google Patents

Internal reinforcing plate of foaming box plate and processing technology thereof Download PDF

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Publication number
CN113527841A
CN113527841A CN202110816624.0A CN202110816624A CN113527841A CN 113527841 A CN113527841 A CN 113527841A CN 202110816624 A CN202110816624 A CN 202110816624A CN 113527841 A CN113527841 A CN 113527841A
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China
Prior art keywords
ultrasonic treatment
plate
percent
foaming
reinforcing plate
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CN202110816624.0A
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Chinese (zh)
Inventor
蔡传鑫
徐新
蔡玮泽
徐星星
陈志坚
李龙
何春敏
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Xichengshi Jiangsu Air Conditioning And Refrigeration Equipment Co ltd
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Xichengshi Jiangsu Air Conditioning And Refrigeration Equipment Co ltd
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Priority to CN202110816624.0A priority Critical patent/CN113527841A/en
Publication of CN113527841A publication Critical patent/CN113527841A/en
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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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0085—Use of fibrous compounding ingredients
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/009—Use of pretreated compounding ingredients
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141—Hydrocarbons
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/20—Casings or covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/002—Panels; Plates; Sheets
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • 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
    • C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
    • 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
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • 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
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/06—Elements
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/10—Silicon-containing compounds
    • 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
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients

Abstract

The invention discloses a foamed box board internal reinforcing plate and a processing technology thereof, in particular to the technical field of air-conditioning box boards, comprising the following steps: epoxy resin, polyurethane adhesive, benzyl glycidyl ether, dicyandiamide solution, foaming agent and reinforcing filler. The invention can effectively improve the structural strength of the reinforcing plate, has lower density and light weight, can be directly used as a substitute material of a polyurethane foaming plate, does not need to occupy the self space of the foaming box plate, and can effectively ensure the floor area of the air-conditioning box and reduce the self weight; the light structure of the reinforcing plate can be effectively ensured, so that the reinforcing plate has good bonding strength and chemical resistance; the hollow microspheres are used as light fillers, so that the density and the heat conductivity of the reinforcing plate can be effectively reduced, the titanium dioxide and the silica sol are compounded and coated on the hollow microspheres, the strength of the hollow microspheres can be enhanced, the heat-insulating property of the hollow microspheres is improved, and the heat-insulating property and the light structure of the reinforcing plate are further enhanced.

Description

Internal reinforcing plate of foaming box plate and processing technology thereof
Technical Field
The invention relates to the technical field of air-conditioning box plates, in particular to an internal reinforcing plate of a foaming box plate and a processing technology thereof.
Background
The air conditioning cabinet is a unit formed by integrally assembling air treatment components such as an air filter, a surface cooler, a heater, a humidifier and the like in a vertical/horizontal cabinet type cabinet body. The box plate of the air-conditioning box is generally made of a polyurethane foam plate in the middle and metal plates on two sides, and is commonly called a sandwich plate. In the operation process of the air-conditioning box, the air pressure difference and the temperature difference between the inside and the outside of the air-conditioning box exist in the air-conditioning box, the box plate is easy to deform under the action of the pressure difference between the inside and the outside of the air-conditioning box, and the structural part inside the box body is promoted to displace or deform, so that the foaming box plate of the air conditioner needs to be added with an internal reinforcing structure to increase the strength of the box plate.
At present, the mode of reinforcing structure is added in the foaming boxboard for foaming boxboard self size grow, and then lead to the air-conditioning box volume great, it is more to occupy the place, and the whole weight of air-conditioning box increases.
Disclosure of Invention
In order to overcome the above defects in the prior art, embodiments of the present invention provide an internal reinforcing plate for a foamed box board and a processing method thereof.
The internal reinforcing plate of the foaming box plate comprises the following components in percentage by weight: 45.60-48.20% of epoxy resin, 19.40-20.40% of polyurethane adhesive, 7.50-8.70% of benzyl glycidyl ether, 8.90-9.70% of dicyandiamide solution, 3.60-5.20% of foaming agent and the balance of reinforcing filler.
Further, the reinforcing filler comprises the following components in percentage by weight: 22.80-23.40% of carbon fiber, 22.80-23.40% of mullite fiber, 5.50-6.30% of nano cellulose, 8.60-9.20% of silica sol, 8.60-9.20% of titanium dioxide and the balance of hollow microspheres.
Further, the paint comprises the following components in percentage by weight: 45.60 percent of epoxy resin, 19.40 percent of polyurethane adhesive, 7.50 percent of benzyl glycidyl ether, 8.90 percent of dicyandiamide solution, 3.60 percent of foaming agent and 15.00 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 22.80% of carbon fiber, 22.80% of mullite fiber, 5.50% of nano-cellulose, 8.60% of silica sol, 8.60% of titanium dioxide and 31.70% of hollow microspheres.
Further, the paint comprises the following components in percentage by weight: 48.20% of epoxy resin, 20.40% of polyurethane adhesive, 8.70% of benzyl glycidyl ether, 9.70% of dicyandiamide solution, 5.20% of foaming agent and 7.80% of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.40% of carbon fiber, 23.40% of mullite fiber, 6.30% of nano-cellulose, 9.20% of silica sol, 9.20% of titanium dioxide and 28.50% of hollow microspheres.
Further, the paint comprises the following components in percentage by weight: 46.90 percent of epoxy resin, 19.90 percent of polyurethane adhesive, 8.10 percent of benzyl glycidyl ether, 9.30 percent of dicyandiamide solution, 4.40 percent of foaming agent and 11.40 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.10% of carbon fiber, 23.10% of mullite fiber, 5.90% of nano-cellulose, 8.90% of silica sol, 8.90% of titanium dioxide and 30.10% of hollow microspheres.
Further, the solid content of the dicyandiamide solution is 12.5%, and the foaming agent is one or more of nitrogen, carbon dioxide, butane and hydrofluorocarbon.
The invention also provides a processing technology of the internal reinforcing plate of the foaming box plate, which comprises the following specific processing steps:
the method comprises the following steps: weighing the epoxy resin, the polyurethane adhesive, the benzyl glycidyl ether, the dicyandiamide solution, the foaming agent and the reinforcing filler in parts by weight;
step two: adding the reinforcing filler obtained in the step one into a steam kinetic energy mill for processing to obtain a mixed base material A;
step three: mixing and stirring the epoxy resin and benzyl glycidyl ether in the step one for 10-20 minutes, adding the polyurethane adhesive in the step one, and performing ultrasonic treatment for 40-50 minutes to obtain a mixed base material B;
step four: mixing and stirring the mixed base material A prepared in the step two and the mixed base material B prepared in the step three, and simultaneously carrying out ultrasonic treatment for 60-80 minutes to obtain a mixed base material C;
step five: adding the dicyandiamide solution obtained in the step one into the mixed base material C obtained in the step four, uniformly mixing, and then carrying out extrusion molding at 220-240 ℃ to obtain a plate to be foamed;
step six: and C, placing the plate to be foamed obtained in the step five in a mould pressing foaming machine, introducing a foaming agent, heating, pressurizing, maintaining pressure, relieving pressure and opening the mould to obtain the internal reinforcing plate of the foaming box plate.
Further, in the second step, the working pressure of the steam kinetic energy mill is 20-30 bar, the steam temperature is 230-360 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.4-1.8 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 3-5 minutes at the frequency of 22-26 KHz each time, and then ultrasonic treatment is carried out for 3-5 minutes at the frequency of 1.2-1.8 MHz; in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 120-180 ℃, the pressure is 1.2-1.8 MPa, the pressure is maintained for 2-6 hours, and the pressure is quickly released for 5-15 s.
Further, in the second step, the working pressure of the steam kinetic energy mill is 20bar, the steam temperature is 230 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.4 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 3 minutes at the frequency of 22KHz each time, and then ultrasonic treatment is carried out for 3 minutes at the frequency of 1.2 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 120 ℃, the pressure is 1.2MPa, the pressure is maintained for 2h, and the pressure is quickly released for 5 s.
Further, in the second step, the working pressure of the steam kinetic energy mill is 25bar, the steam temperature is 295 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.6 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 4 minutes at the frequency of 24KHz each time, and then ultrasonic treatment is carried out for 4 minutes at the frequency of 1.5 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 150 ℃, the pressure is 1.5MPa, the pressure is maintained for 4 hours, and the pressure is quickly released for 10 s.
The invention has the technical effects and advantages that:
1. the internal reinforcing plate of the foaming box plate prepared by the raw material formula can effectively improve the structural strength of the internal reinforcing plate of the foaming box plate, has low density, light weight and better supporting effect on the air conditioning box plate, and can effectively ensure the floor area of the air conditioning box and reduce the weight of the air conditioning box; benzyl glycidyl ether in the formula is used as a diluent to dilute epoxy resin to obtain a low-viscosity resin system, so that the light structure of the reinforcing plate can be effectively ensured, the polyurethane adhesive contains isocyanate groups, and secondary hydroxyl groups in the epoxy resin can react with isocyanate, so that the reinforcing plate has good bonding strength and chemical resistance; the carbon fiber and mullite fiber in the reinforcing filler are used as a supporting framework, the silica sol is used as a binder, the nanocellulose is used as a carbon source to provide reduction performance, the hollow microspheres are used as light fillers, the density and the heat conductivity of the reinforcing plate can be effectively reduced, the titanium dioxide and the silica sol are compounded and coated on the hollow microspheres, the strength of the hollow microspheres can be enhanced, and meanwhile the heat insulation performance of the hollow microspheres is improved; the structural strength of the foaming box board can be effectively improved, and the weight of the air conditioner box is reduced;
2. in the process of preparing the reinforcing plate inside the foaming box plate, in the second step, the reinforcing filler is subjected to blending, polishing and crushing treatment by using a steam kinetic energy mill, so that the uniform mixing effect among all components in the reinforcing filler can be effectively enhanced, and the subsequent processing procedures are facilitated; in the third step, the epoxy resin, the benzyl glycidyl ether and the polyurethane adhesive are reacted under the ultrasonic treatment of 1.6MHz, so that the reaction process can be effectively accelerated, and the processing time is shortened; in the fourth step, the mixed base material A and the mixed base material B are mixed and subjected to ultrasonic treatment, 24KHz ultrasonic treatment can generate a cavitation effect in the mixed material, 1.5MHz ultrasonic treatment can be uniformly dispersed in the mixed material, the uniform mixing effect of the mixed base material A and the mixed base material B can be effectively enhanced, the distribution uniformity is better, the ultrasonic treatment with two different frequencies is alternated, and the blending composite treatment effect of the mixed base material A and the mixed base material B can be effectively enhanced.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, 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.
Example 1:
the invention provides an internal reinforcing plate of a foaming box plate, which comprises the following components in percentage by weight: 45.60 percent of epoxy resin, 19.40 percent of polyurethane adhesive, 7.50 percent of benzyl glycidyl ether, 8.90 percent of dicyandiamide solution, 3.60 percent of foaming agent and 15.00 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 22.80% of carbon fiber, 22.80% of mullite fiber, 5.50% of nano-cellulose, 8.60% of silica sol, 8.60% of titanium dioxide and 31.70% of hollow microspheres;
the solid content of the dicyandiamide solution is 12.5 percent, and the foaming agent is one or a plurality of nitrogen, carbon dioxide, butane and hydrofluorocarbon;
the invention also provides a processing technology of the internal reinforcing plate of the foaming box plate, which comprises the following specific processing steps:
the method comprises the following steps: weighing the epoxy resin, the polyurethane adhesive, the benzyl glycidyl ether, the dicyandiamide solution, the foaming agent and the reinforcing filler in parts by weight;
step two: adding the reinforcing filler obtained in the step one into a steam kinetic energy mill for processing to obtain a mixed base material A;
step three: mixing and stirring the epoxy resin and benzyl glycidyl ether in the step one for 10 minutes, then adding the polyurethane adhesive in the step one, and carrying out ultrasonic treatment for 40 minutes to obtain a mixed base material B;
step four: mixing and stirring the mixed base material A prepared in the step two and the mixed base material B prepared in the step three, and simultaneously carrying out ultrasonic treatment for 60 minutes to obtain a mixed base material C;
step five: adding the dicyandiamide solution obtained in the step one into the mixed base material C obtained in the step four, uniformly mixing, and then carrying out extrusion molding at 220 ℃ to obtain a plate to be foamed;
step six: and C, placing the plate to be foamed obtained in the step five in a mould pressing foaming machine, introducing a foaming agent, heating, pressurizing, maintaining pressure, relieving pressure and opening the mould to obtain the internal reinforcing plate of the foaming box plate.
In the second step, the working pressure of the steam kinetic energy mill is 20bar, the steam temperature is 230 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.4 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 3 minutes at the frequency of 22KHz each time, and then ultrasonic treatment is carried out for 3 minutes at the frequency of 1.2 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 120 ℃, the pressure is 1.2MPa, the pressure is maintained for 2h, and the pressure is quickly released for 5 s.
Example 2:
different from the embodiment 1, the material comprises the following components in percentage by weight: 48.20% of epoxy resin, 20.40% of polyurethane adhesive, 8.70% of benzyl glycidyl ether, 9.70% of dicyandiamide solution, 5.20% of foaming agent and 7.80% of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.40% of carbon fiber, 23.40% of mullite fiber, 6.30% of nano-cellulose, 9.20% of silica sol, 9.20% of titanium dioxide and 28.50% of hollow microspheres.
Example 3:
different from the examples 1-2, the material comprises the following components in percentage by weight: 46.90 percent of epoxy resin, 19.90 percent of polyurethane adhesive, 8.10 percent of benzyl glycidyl ether, 9.30 percent of dicyandiamide solution, 4.40 percent of foaming agent and 11.40 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.10% of carbon fiber, 23.10% of mullite fiber, 5.90% of nano-cellulose, 8.90% of silica sol, 8.90% of titanium dioxide and 30.10% of hollow microspheres.
Taking the inner reinforcing plates of the foaming box boards prepared in the above examples 1-3, the inner reinforcing plates of the foaming box boards of the first control group, the inner reinforcing plates of the foaming box boards of the second control group, the inner reinforcing plates of the foaming box boards of the third control group, the inner reinforcing plates of the foaming box boards of the fourth control group, the inner reinforcing plates of the foaming box boards of the fifth control group and the inner reinforcing plates of the foaming box boards of the sixth control group, respectively, the inner reinforcing plates of the foaming box boards of the first control group have no carbon fiber compared with the examples, the inner reinforcing plates of the foaming box boards of the second control group have no mullite fiber compared with the examples, the inner reinforcing plates of the foaming box boards of the third control group have no nano-cellulose compared with the examples, the inner reinforcing plates of the foaming box boards of the fourth control group have no silica sol compared with the examples, the inner reinforcing plates of the foaming box boards of the fifth control group have no titanium dioxide compared with the examples, and the inner reinforcing plates of the foaming box boards of the sixth control group have no hollow microspheres compared with the examples, the foamed box board internal reinforcing plates prepared in the three examples and the foamed box board internal reinforcing plates of the six control groups were tested in nine groups, each 30 samples were taken as one group, and the test results are shown in table one:
table one:
Figure BDA0003170342560000051
Figure BDA0003170342560000061
as can be seen from Table I, when the reinforcing plate inside the foamed box plate is made of the following raw materials: comprises the following components in percentage by weight: 46.90 percent of epoxy resin, 19.90 percent of polyurethane adhesive, 8.10 percent of benzyl glycidyl ether, 9.30 percent of dicyandiamide solution, 4.40 percent of foaming agent and 11.40 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.10 percent of carbon fiber, 23.10 percent of mullite fiber, 5.90 percent of nano-cellulose, 8.90 percent of silica sol, 8.90 percent of titanium dioxide and 30.10 percent of hollow micro-beads, the structural strength of the reinforcing plate in the foaming box plate can be effectively improved, meanwhile, the density is lower, the weight is light, the supporting effect on the air-conditioning box plate is better, the floor area of the air-conditioning box can be effectively ensured, and the self weight can be effectively reduced; example 3 is a preferred embodiment of the present invention, in the formula, epoxy resin and benzyl glycidyl ether are used as a diluent to dilute epoxy resin, so as to obtain a low viscosity resin system, which can effectively ensure the lightweight structure of the reinforcing plate, the epoxy resin and the polyurethane adhesive are compounded, the polyurethane adhesive contains isocyanate groups, and secondary hydroxyl groups in the epoxy resin can react with isocyanate, so that the reinforcing plate has good adhesive strength and chemical resistance; the dicyandiamide solution is used as a curing agent, so that the rapid curing of the epoxy resin can be effectively ensured; the foaming agent is used for carrying out foaming treatment on the reinforcing plate, so that the foaming internal structure of the reinforcing plate is ensured; carbon fibers and mullite fibers in the reinforcing filler are used as a supporting framework, silica sol is used as a binder, nanocellulose is used as a carbon source to provide reduction performance, a porous carbon nano material is formed under the ultrasonic action, the porous carbon nano material is compounded on the carbon fibers and the mullite fibers, the light structure and the supporting strength of the reinforcing plate can be further improved, hollow microspheres are used as the light filler, the density and the heat conductivity of the reinforcing plate can be effectively reduced, the titanium dioxide and the silica sol are compounded and coated on the hollow microspheres, the strength of the hollow microspheres can be enhanced, and meanwhile the heat insulation performance of the hollow microspheres is improved; the structural strength of the foaming box plate can be effectively improved, and the weight of the air conditioner box is reduced.
Example 4:
the invention provides an internal reinforcing plate of a foaming box plate, which comprises the following components in percentage by weight: 46.90 percent of epoxy resin, 19.90 percent of polyurethane adhesive, 8.10 percent of benzyl glycidyl ether, 9.30 percent of dicyandiamide solution, 4.40 percent of foaming agent and 11.40 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.10% of carbon fiber, 23.10% of mullite fiber, 5.90% of nano-cellulose, 8.90% of silica sol, 8.90% of titanium dioxide and 30.10% of hollow microspheres;
the solid content of the dicyandiamide solution is 12.5 percent, and the foaming agent is one or a plurality of nitrogen, carbon dioxide, butane and hydrofluorocarbon;
the invention also provides a processing technology of the internal reinforcing plate of the foaming box plate, which comprises the following specific processing steps:
the method comprises the following steps: weighing the epoxy resin, the polyurethane adhesive, the benzyl glycidyl ether, the dicyandiamide solution, the foaming agent and the reinforcing filler in parts by weight;
step two: adding the reinforcing filler obtained in the step one into a steam kinetic energy mill for processing to obtain a mixed base material A;
step three: mixing and stirring the epoxy resin and benzyl glycidyl ether in the step one for 15 minutes, adding the polyurethane adhesive in the step one, and performing ultrasonic treatment for 45 minutes to obtain a mixed base material B;
step four: mixing and stirring the mixed base material A prepared in the step two and the mixed base material B prepared in the step three, and simultaneously carrying out ultrasonic treatment for 70 minutes to obtain a mixed base material C;
step five: adding the dicyandiamide solution obtained in the step one into the mixed base material C obtained in the step four, uniformly mixing, and then carrying out extrusion molding at 230 ℃ to obtain a plate to be foamed;
step six: and C, placing the plate to be foamed obtained in the step five in a mould pressing foaming machine, introducing a foaming agent, heating, pressurizing, maintaining pressure, relieving pressure and opening the mould to obtain the internal reinforcing plate of the foaming box plate.
In the second step, the working pressure of the steam kinetic energy mill is 20bar, the steam temperature is 230 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.4 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 3 minutes at the frequency of 22KHz each time, and then ultrasonic treatment is carried out for 3 minutes at the frequency of 1.2 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 120 ℃, the pressure is 1.2MPa, the pressure is maintained for 2h, and the pressure is quickly released for 5 s.
Example 5:
different from the embodiment 4, in the second step, the working pressure of the steam kinetic energy mill is 30bar, the steam temperature is 360 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.8 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 5 minutes at the frequency of 26KHz each time, and then ultrasonic treatment is carried out for 5 minutes at the frequency of 1.8 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 180 ℃, the pressure is 1.8MPa, the pressure is maintained for 6 hours, and the pressure is quickly released for 15 s.
Example 6:
different from the embodiments 4-5, in the second step, the working pressure of the steam kinetic energy mill is 25bar, the steam temperature is 295 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.6 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 4 minutes at the frequency of 24KHz each time, and then ultrasonic treatment is carried out for 4 minutes at the frequency of 1.5 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 150 ℃, the pressure is 1.5MPa, the pressure is maintained for 4 hours, and the pressure is quickly released for 10 s.
Taking the internal reinforcing plates of the foamed box boards prepared in the above examples 4-6 and the internal reinforcing plates of the foamed box board of the control group seven, the internal reinforcing plates of the foamed box board of the control group eight and the internal reinforcing plates of the foamed box board of the control group nine, respectively, comparing the internal reinforcing plates of the foamed box board of the control group seven with the examples, the operation in the step two is not performed, comparing the internal reinforcing plates of the foamed box board of the control group eight with the examples, the operation in the step three is not performed, comparing the internal reinforcing plates of the foamed box board of the control group nine with the examples, the internal reinforcing plates of the foamed box boards prepared in the three examples and the internal reinforcing plates of the foamed box board of the three control groups are tested in six groups, each 30 samples are taken as a group, and the test results are shown in the table two:
table two:
Figure BDA0003170342560000081
as can be seen from table two, example 6 is a preferred embodiment of the present invention; in the second step, the reinforcing filler is subjected to blending, polishing and crushing treatment by using a steam kinetic energy mill, so that the uniform mixing effect among the components in the reinforcing filler can be effectively enhanced, and the subsequent processing procedures are facilitated; in the third step, the epoxy resin, the benzyl glycidyl ether and the polyurethane adhesive react under 1.6MHz ultrasonic treatment, so that the contact mixing effect among the raw materials can be effectively enhanced, the reaction process can be effectively accelerated, and the processing time is shortened; in the fourth step, the mixed base material A and the mixed base material B are mixed and subjected to ultrasonic treatment, 24KHz ultrasonic treatment can generate cavitation effect in the mixed material, and the instant high temperature generated by the collapse of cavitation bubbles, can effectively promote the nanocellulose in the mixed base material A to react to synthesize the porous carbon nanomaterial, simultaneously improves the contact mixing treatment effect of the raw materials in the mixed base material A, in addition, the cavitation effect can effectively promote the reaction process among the raw materials in the mixed base material B, can effectively promote the blending composite effect of the mixed base material A and the mixed base material B, thereby effectively improving the reinforcing treatment effect of the reinforcing filler on the epoxy resin, enabling the 1.5MHz ultrasonic treatment to be uniformly dispersed in the mixture, the blending effect of the mixed base material A and the mixed base material B can be effectively enhanced, the distribution uniformity is better, the ultrasonic treatment of two different frequencies is alternately carried out, and the blending composite treatment effect of the mixed base material A and the mixed base material B can be effectively enhanced; in the fifth step, the dicyandiamide solution and the mixed base material C are uniformly mixed, and then the plate making treatment is carried out; and step six, adding a foaming agent into the plate to be foamed, and foaming to obtain the internal reinforcing plate of the foamed box plate.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides an inside stiffening plate of foaming boxboard which characterized in that: comprises the following components in percentage by weight: 45.60-48.20% of epoxy resin, 19.40-20.40% of polyurethane adhesive, 7.50-8.70% of benzyl glycidyl ether, 8.90-9.70% of dicyandiamide solution, 3.60-5.20% of foaming agent and the balance of reinforcing filler.
2. The internal reinforcing plate for a foam box board of claim 1, wherein: the reinforcing filler comprises the following components in percentage by weight: 22.80-23.40% of carbon fiber, 22.80-23.40% of mullite fiber, 5.50-6.30% of nano cellulose, 8.60-9.20% of silica sol, 8.60-9.20% of titanium dioxide and the balance of hollow microspheres.
3. The internal reinforcing plate for a foam box board of claim 2, wherein: comprises the following components in percentage by weight: 45.60 percent of epoxy resin, 19.40 percent of polyurethane adhesive, 7.50 percent of benzyl glycidyl ether, 8.90 percent of dicyandiamide solution, 3.60 percent of foaming agent and 15.00 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 22.80% of carbon fiber, 22.80% of mullite fiber, 5.50% of nano-cellulose, 8.60% of silica sol, 8.60% of titanium dioxide and 31.70% of hollow microspheres.
4. The internal reinforcing plate for a foam box board of claim 2, wherein: comprises the following components in percentage by weight: 48.20% of epoxy resin, 20.40% of polyurethane adhesive, 8.70% of benzyl glycidyl ether, 9.70% of dicyandiamide solution, 5.20% of foaming agent and 7.80% of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.40% of carbon fiber, 23.40% of mullite fiber, 6.30% of nano-cellulose, 9.20% of silica sol, 9.20% of titanium dioxide and 28.50% of hollow microspheres.
5. The internal reinforcing plate for a foam box board of claim 2, wherein: comprises the following components in percentage by weight: 46.90 percent of epoxy resin, 19.90 percent of polyurethane adhesive, 8.10 percent of benzyl glycidyl ether, 9.30 percent of dicyandiamide solution, 4.40 percent of foaming agent and 11.40 percent of reinforcing filler; the reinforcing filler comprises the following components in percentage by weight: 23.10% of carbon fiber, 23.10% of mullite fiber, 5.90% of nano-cellulose, 8.90% of silica sol, 8.90% of titanium dioxide and 30.10% of hollow microspheres.
6. The internal reinforcing plate for a foam box board of claim 2, wherein: the solid content of the dicyandiamide solution is 12.5%, and the foaming agent is one or more of nitrogen, carbon dioxide, butane and hydrofluorocarbon.
7. The process for manufacturing the internal reinforcing plate of the foam box board according to any one of claims 1 to 6, wherein: the specific processing steps are as follows:
the method comprises the following steps: weighing the epoxy resin, the polyurethane adhesive, the benzyl glycidyl ether, the dicyandiamide solution, the foaming agent and the reinforcing filler in parts by weight;
step two: adding the reinforcing filler obtained in the step one into a steam kinetic energy mill for processing to obtain a mixed base material A;
step three: mixing and stirring the epoxy resin and benzyl glycidyl ether in the step one for 10-20 minutes, adding the polyurethane adhesive in the step one, and performing ultrasonic treatment for 40-50 minutes to obtain a mixed base material B;
step four: mixing and stirring the mixed base material A prepared in the step two and the mixed base material B prepared in the step three, and simultaneously carrying out ultrasonic treatment for 60-80 minutes to obtain a mixed base material C;
step five: adding the dicyandiamide solution obtained in the step one into the mixed base material C obtained in the step four, uniformly mixing, and then carrying out extrusion molding at 220-240 ℃ to obtain a plate to be foamed;
step six: and C, placing the plate to be foamed obtained in the step five in a mould pressing foaming machine, introducing a foaming agent, heating, pressurizing, maintaining pressure, relieving pressure and opening the mould to obtain the internal reinforcing plate of the foaming box plate.
8. The processing technology of the internal reinforcing plate of the foaming box plate as claimed in claim 7, wherein the processing technology comprises the following steps: in the second step, the working pressure of the steam kinetic energy mill is 20-30 bar, the steam temperature is 230-360 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.4-1.8 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 3-5 minutes at the frequency of 22-26 KHz each time, and then ultrasonic treatment is carried out for 3-5 minutes at the frequency of 1.2-1.8 MHz; in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 120-180 ℃, the pressure is 1.2-1.8 MPa, the pressure is maintained for 2-6 hours, and the pressure is quickly released for 5-15 s.
9. The processing technology of the internal reinforcing plate of the foaming box plate as claimed in claim 8, wherein the processing technology comprises the following steps: in the second step, the working pressure of the steam kinetic energy mill is 20bar, the steam temperature is 230 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.4 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 3 minutes at the frequency of 22KHz each time, and then ultrasonic treatment is carried out for 3 minutes at the frequency of 1.2 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 120 ℃, the pressure is 1.2MPa, the pressure is maintained for 2h, and the pressure is quickly released for 5 s.
10. The processing technology of the internal reinforcing plate of the foaming box plate as claimed in claim 8, wherein the processing technology comprises the following steps: in the second step, the working pressure of the steam kinetic energy mill is 25bar, the steam temperature is 295 ℃, and the outlet speed of the high-energy jet mill nozzle can reach 1020 m/s; in the third step, the ultrasonic treatment frequency is 1.6 MHz; in the fourth step, double-frequency staggered ultrasonic treatment is adopted, ultrasonic treatment is carried out for 4 minutes at the frequency of 24KHz each time, and then ultrasonic treatment is carried out for 4 minutes at the frequency of 1.5 MHz; and in the sixth step, the temperature of the mould pressing foaming machine is adjusted to be 150 ℃, the pressure is 1.5MPa, the pressure is maintained for 4 hours, and the pressure is quickly released for 10 s.
CN202110816624.0A 2021-07-20 2021-07-20 Internal reinforcing plate of foaming box plate and processing technology thereof Pending CN113527841A (en)

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CN112852365A (en) * 2021-01-20 2021-05-28 优链新材料科技（上海）有限公司 High-toughness high-strength epoxy composite material with plastic replacing steel and preparation method thereof

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US20040266899A1 (en) * 2001-12-21 2004-12-30 Xaver Muenz Expandable epoxy resin-based systems modified with thermoplastic polymers
WO2008145415A1 (en) * 2007-06-01 2008-12-04 Henkel Kommanditgesellschaft Auf Aktien Heat-curable, thermally expandable molded object with long fibers or fiber formations
CN105694368A (en) * 2016-03-17 2016-06-22 合肥晨煦信息科技有限公司 Preparation method of fiber reinforced damping composite
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