CN107187078B - carbon fiber prepreg rapid compression molding process - Google Patents
carbon fiber prepreg rapid compression molding process Download PDFInfo
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- CN107187078B CN107187078B CN201710506017.8A CN201710506017A CN107187078B CN 107187078 B CN107187078 B CN 107187078B CN 201710506017 A CN201710506017 A CN 201710506017A CN 107187078 B CN107187078 B CN 107187078B
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- carbon fiber
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- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0872—Prepregs
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Robotics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
The invention discloses a rapid compression molding process for carbon fiber prepregs, which is based on a prepreg molding process and can realize simultaneous implementation of an online molding curing process, a lower cycle hot laying process and an upper cycle product cooling post-treatment process, and a final product has no warpage.
Description
Technical Field
The invention relates to the technical field of high polymer material preparation, in particular to a rapid compression molding process for carbon fiber prepregs.
Background
The carbon fiber prepreg is widely applied to the fields of fishing tackle, sports equipment, sports goods, aerospace, vehicles and the like, particularly, along with the development of the automobile industry, the requirement for light weight is higher and higher, the carbon fiber and the composite material thereof are more and more applied to automobiles in , the carbon fiber prepreg is an intermediate material formed by impregnating the carbon fiber or the fabric thereof with a controlled amount of resin, the carbon fiber prepreg is formed without resin infusion, the environment is friendly, the prepreg forming product has stable resin content, good surface quality and simple process, the carbon fiber prepreg can be formed into the composite material product through an autoclave, vacuum assistance and a die pressing process, and the prepreg die pressing process has higher efficiency at present.
Compared with other prepreg molding processes, the prepreg molding process has the advantages of higher production efficiency, accurate product size, smooth surface, good repeatability of the appearance size of the product, low production cost and easy realization of mechanization and automation.
However, the conventional prepreg molding process needs to mold the prepreg after the prepreg is made into a preform, coating of a release agent and cleaning of a mold are time-consuming and labor-consuming and affect the environment, each molding cycles need to be fully cooled, and then the mold can be released, so that the single molding cycle is hours or more, the molding efficiency is lower than that of other automobile materials such as metal and plastic, and the application of carbon fiber materials to automobiles is limited.
Therefore, new technical means are needed to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems of long mould pressing process period and low forming efficiency of carbon fiber prepregs in the prior art, and provides carbon fiber prepreg rapid mould pressing processes which are efficient, rapid, low-carbon, low-energy-consumption and good in quality of formed finished products, and production efficiency is improved.
The technical scheme includes that in order to solve the technical problems, the rapid compression molding process of carbon fiber prepregs is based on a carbon fiber prepreg molding process which is used as a molding material, and the materials and equipment of the rapid compression molding process include a rapid curing/high glass transition temperature carbon fiber prepreg, a laying operation table, a prepreg molding press, a self-cleaning non-stick mold, an automatic cutting bed and a vacuum pump, and mainly include a hot laying process, a hot piece taking process and a self-cleaning process of the self-cleaning non-stick mold, and the process specifically includes the following steps:
(1) a hot laying process: heating the self-cleaning non-stick mould to a curing temperature, and then cutting and laying prepreg: laying the prepreg cut by an automatic cutting bed according to a laying design, and transferring the laid prepreg into a self-cleaning non-stick mould cavity for hot laying;
(2) an online mould pressing curing process comprises the following steps: closing the die and pressurizing the hot laid material and vacuumizing, pre-compacting for 5-30s under the pressure of 0.4-1.2MPa after die closing, vacuumizing at the vacuum degree of not less than-97 KPa, raising the pressure to 3-20MPa, and performing hot press molding for 0.5-1.5min, wherein the online die pressing and curing process and the hot laying process are performed simultaneously;
(3) directly opening a mold at a curing temperature after curing and molding to take out a product, transferring the product into a cold mold to be cooled and post-treated without reducing the temperature to a lower temperature (below 60 ℃), directly entering a lower -period hot laying process without cleaning the mold, wherein the online mold pressing and curing process, the lower -period hot laying process and the upper -period product cooling post-treatment process are carried out simultaneously, and the final product has no buckling deformation.
The self-cleaning non-stick mold base material is prepared from a metal material, layers of non-stick coatings are coated on a cavity of the self-cleaning non-stick mold base material, a release agent is not required to be coated, no residue is left when a product is demolded, and an additional mold cleaning process is not required.
The non-stick coating is or the mixture of two of polytetrafluoroethylene and silica gel materials, and the problems of foaming, cracking, falling off, color change and the like do not occur within 10 ten thousand times under the curing pressure of 3-20MPa within the curing temperature range of room temperature to 200 ℃.
More preferably, the reinforcing material of the carbon fiber prepreg is or more of carbon fiber, glass fiber, aramid fiber, other organic or inorganic fiber, and a mixture of other organic or inorganic fiber.
More preferably, the matrix material of the carbon fiber prepreg is a thermosetting resin or a thermoplastic resin.
Further , the thermosetting resin is or more of epoxy resin, phenolic resin and unsaturated polyester.
Further , the thermoplastic resin is or a mixture of nylon resin and polyformaldehyde resin.
More preferably, the curing temperature is from room temperature to 200 ℃.
And , the hot laying temperature and the hot taking temperature are 80-200 ℃.
More preferably, the carbon fiber prepreg is a prepreg curable within 1 min.
The carbon fiber prepreg rapid compression molding process provided by the invention has the beneficial effects that the carbon fiber prepreg is taken as a molding material, the prepreg compression molding process is taken as a basis, the on-line compression molding curing process, the lower cycle hot laying process and the upper cycle product cooling post-treatment process can be simultaneously carried out, and the final product has no buckling deformation.
Drawings
FIG. 1 is a schematic view of the rapid compression molding process of carbon fiber prepregs.
Detailed Description
The invention is further illustrated in step by reference to the following examples:
example 1:
carbon fiber prepreg rapid compression molding process, wherein the prepreg is a unidirectional carbon fiber epoxy resin prepreg, the curing temperature is 150 ℃, the prepreg can be kept for 20s at 150 ℃ without gelling and curing, the curing time is 1min, the glass transition temperature after curing is 140 ℃ plus 150 ℃, a flat self-cleaning non-stick mold is adopted, the self-cleaning non-stick mold substrate is prepared from a metal material, a cavity of the self-cleaning non-stick mold substrate is coated with layers of non-stick coatings, a release agent is not required to be coated, no residue is left during product demolding, and no additional mold cleaning process is required, the non-stick coatings are polytetrafluoroethylene, and the problems of foaming, cracking, falling off, color change and the like are avoided within 10 ten thousand mold times under the curing pressure of 3-20MPa within the curing temperature range of room temperature.
Referring to fig. 1, the specific process steps include that equipment is opened to rapidly heat a self-cleaning non-stick mold to a curing temperature of 150 ℃, a single-direction carbon fiber epoxy resin prepreg is cut by an automatic cutting bed, the cut single-direction carbon fiber epoxy resin prepreg with the same area (300 x 600) is laid and transferred into a flat self-cleaning non-stick mold cavity, 20 layers of the layers are laid according to the whole 0 DEG, the mold is closed, a vacuum pump is opened to pump vacuum, pre-compaction is carried out for 5-10s under the pressure of 0.4-0.6MPa, the pressure is increased to 8-10MPa, heat preservation and pressure maintaining are carried out for 0.5-1min to carry out curing molding, after curing is finished, vacuumizing is stopped, the mold is opened to directly take a piece, the piece is placed into a cold mold to be cooled, the mold does not need to be cleaned, the mold directly enters a lower forming cycle, the whole forming cycle is used for 2.5-4min, and the product does not.
Tests show that the basic properties of the molded part are as follows:
0 degree tensile strength 1723MPa, 0 degree tensile modulus 124 GPa;
the tensile strength at 90 degrees is 45MPa, and the tensile modulus at 90 degrees is 8.9 GPa;
0 degree compressive strength 1275 MPa;
the performance of the composite material is equivalent to that of the conventional carbon fiber epoxy resin prepreg compression molding composite material.
Example 2:
carbon fiber prepreg rapid compression molding process, wherein the prepreg is a unidirectional carbon fiber epoxy resin prepreg, the curing temperature is 90 ℃, the prepreg can be kept for 30s at 90 ℃ without gelling and curing, the curing time is 1min, the glass transition temperature after curing is 80-90 ℃, and a flat self-cleaning non-stick mold is adopted, the self-cleaning non-stick mold substrate is prepared from a metal material, a cavity of the self-cleaning non-stick mold substrate is coated with layers of non-stick coatings, a release agent is not required to be coated, no residue is left during product demolding, and no additional mold cleaning process is required, the non-stick coatings are silica gel materials, and the problems of foaming, cracking, falling off, color change and the like are avoided within 10 ten thousand mold times under the curing pressure of 3-20MPa within the curing temperature range of.
Referring to fig. 1, the specific process comprises the steps of opening a device to rapidly heat a self-cleaning non-stick mold to 90 ℃, cutting a unidirectional carbon fiber epoxy resin prepreg by an automatic cutting bed, then laying the cut unidirectional carbon fiber epoxy resin prepreg with the same area (300 x 600), transferring the unidirectional carbon fiber epoxy resin prepreg into a flat self-cleaning non-stick mold cavity, layering according to [0 °/90 ° ]5S, closing the mold, opening a vacuum pump to vacuumize, pre-compacting for 10-30S at the pressure of 0.6-0.8MPa, increasing the pressure to 10-14MPa, maintaining the temperature and pressure for 0.5-1min to perform curing molding, stopping vacuumizing after curing, opening the mold to directly take a piece, putting the piece into a cold mold to cool, directly entering a lower molding cycle without cleaning, and enabling the product to warp and deform within 3-4min when the whole molding cycle is used.
Tests show that the basic properties of the molded part are as follows: the tensile strength is 873MPa, and the tensile modulus is 57 GPa.
Example 3:
carbon fiber prepreg rapid compression molding process, wherein the prepreg is plain weave carbon fiber epoxy resin prepreg, the curing temperature is 120 ℃, the prepreg can be kept for 30s at 120 ℃ without gelling and curing, the curing time is 1min, the glass transition temperature after curing is 110 plus one 120 ℃, and a flat self-cleaning non-stick mold is adopted, the self-cleaning non-stick mold substrate is prepared from a metal material, a cavity of the self-cleaning non-stick mold substrate is coated with layers of non-stick coatings, a release agent is not required to be coated, no residue is left during product demolding, and no additional mold cleaning process is required, the non-stick coatings are two mixtures of polytetrafluoroethylene and silica gel materials, and the problems of foaming, cracking, falling off, discoloration and the like are avoided within 10 ten thousand of mold times under the curing pressure of 3-20MPa within the curing temperature range of.
Referring to fig. 1, the method comprises the following specific process steps of opening a device to rapidly heat a self-cleaning non-stick mold to 120 ℃, cutting a unidirectional carbon fiber epoxy resin prepreg by an automatic cutting bed, then laying 10 layers of cut plain carbon fiber epoxy resin prepregs with the same area (300 × 600), transferring the laminates into a flat self-cleaning non-stick mold cavity, closing the mold, opening a vacuum pump to pump vacuum, pre-compacting for 20-30s at the pressure of 0.8-1.0MPa, increasing the pressure to 12-16MPa, preserving heat and maintaining the pressure for 0.5-1min, curing and forming, stopping vacuumizing after curing, opening the mold to directly take a hot piece, placing the hot piece into a cold mold to cool, directly entering a next forming period without cleaning the mold, and taking 3-4min when the whole forming cycle period is used, wherein the product is free of warping and deformation.
Tests show that the basic properties of the molded part are as follows: tensile strength 935MPa, tensile modulus 63 GPa.
It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that those skilled in the art will be able to modify the invention in its various equivalent forms after reading the present disclosure without departing from the scope of the invention as defined by the appended claims.
Claims (4)
- The rapid compression molding process for carbon fiber prepregs is characterized in that the carbon fiber prepregs are used as molding materials, the prepreg compression molding process is used as a basis, and the rapid compression molding process mainly comprises a hot laying process, a hot piece taking process and a self-cleaning process of a self-cleaning non-stick mold, and specifically comprises the following steps:(1) the hot laying process comprises the steps of heating the self-cleaning non-stick mould to the curing temperature of room temperature to 200 ℃, cutting and laying the prepreg, namely laying the prepreg cut by an automatic cutting bed according to a laying design, and transferring the laid prepreg into a cavity of the self-cleaning non-stick mould for hot laying, wherein the base material of the self-cleaning non-stick mould is prepared from a metal material, layers of non-stick coatings are coated on the cavity of the self-cleaning non-stick mould, and the non-stick coatings are or a mixture of polytetrafluoroethylene and silica gel materials;(2) an online mould pressing curing process comprises the following steps: closing the die and pressurizing the hot laid material and vacuumizing, pre-compacting for 5-30s under the pressure of 0.4-1.2MPa after die closing, vacuumizing at the vacuum degree of not less than-97 KPa, raising the pressure to 3-20MPa, and performing hot press molding for 0.5-1.5min, wherein the online die pressing and curing process and the hot laying process are performed simultaneously;(3) the method comprises the following steps of directly opening a mold at a curing temperature after curing and molding to take out a product, transferring the product into a cold mold to be cooled and post-treated, directly entering a lower -period hot laying process without cleaning the mold, wherein an online mold pressing and curing process, a lower -period hot laying process and an upper -period product cooling and post-treating process are simultaneously carried out, reinforcing materials of carbon fiber prepregs are or more mixtures in a mixture of carbon fibers, glass fibers, aramid fibers, other organic or inorganic fibers and other organic or inorganic fibers, matrix materials of the carbon fiber prepregs are thermosetting resins or thermoplastic resins, and the carbon fiber prepregs are curable within 1 min.
- 2. The carbon fiber prepreg rapid compression molding process according to claim 1, wherein the thermosetting resin is or a mixture of epoxy resin, phenolic resin and unsaturated polyester.
- 3. The carbon fiber prepreg rapid compression molding process according to claim 1, wherein the thermoplastic resin is or a mixture of two of nylon resin and polyformaldehyde resin.
- 4. The carbon fiber prepreg rapid compression molding process according to claim 1, characterized in that: the hot laying temperature and the hot taking temperature are 80-200 ℃.
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Cited By (1)
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| CN111186147A (en) * | 2020-02-24 | 2020-05-22 | 江苏亨睿碳纤维科技有限公司 | Forming method for preparing lightweight automobile parts by using continuous fiber mixed chopped fibers |
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| CN110154419A (en) * | 2018-02-26 | 2019-08-23 | 湖南三合汽车新材料有限公司 | A kind of production technology preparing bonnet using prepreg cloth |
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