CN110962287A - Forming process combining carbon fiber and injection molding - Google Patents

Forming process combining carbon fiber and injection molding Download PDF

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Publication number
CN110962287A
CN110962287A CN201911306972.2A CN201911306972A CN110962287A CN 110962287 A CN110962287 A CN 110962287A CN 201911306972 A CN201911306972 A CN 201911306972A CN 110962287 A CN110962287 A CN 110962287A
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China
Prior art keywords
carbon fiber
fiber cloth
injection molding
mould
mold
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Inventor
蔡欣凯
吴泽强
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Guangzhou Heixi Composite Mstar Technology Ltd
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Guangzhou Heixi Composite Mstar Technology Ltd
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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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336—Coating a portion of the article, e.g. the edge of the article
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14631—Coating reinforcements
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14786—Fibrous material or fibre containing material, e.g. fibre mats or fibre reinforced material
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
    • B29C45/14811—Multilayered articles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
    • C08L55/02—ABS [Acrylonitrile-Butadiene-Styrene] polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065—Positioning or centering articles in the mould
    • B29C2045/14155—Positioning or centering articles in the mould using vacuum or suction
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14237—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity
    • B29C2045/14245—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure the inserts being deformed or preformed outside the mould or mould cavity using deforming or preforming means outside the mould cavity
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B29C2045/14286—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure means for heating the insert
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Abstract

A forming process combining carbon fiber and injection molding relates to the field of carbon fiber processing, and comprises the following steps: step one, a preforming procedure: preprocessing and molding the carbon fiber cloth; step two: an injection molding process: and putting the carbon fiber cloth which is pre-processed and molded into an injection mold, fixing the carbon fiber cloth by using a vacuum chuck, and closing the mold to inject an injection molding material into the mold to complete the injection molding of the carbon fiber cloth. The forming process of the invention does not need gloss oil treatment in the whole treatment process, and glue and the like are not needed to be used for soaking between the carbon fiber and the thermoplastic material, so that the forming process is more environment-friendly. In addition, the forming process greatly reduces the processing cost of the existing carbon fiber cloth, the manufacturing process meets the requirement of environmental protection, and the manufactured product does not have the problems of smell and the like.

Description

Forming process combining carbon fiber and injection molding
The technical field is as follows:
the invention relates to an injection molding process, in particular to a carbon fiber and injection molding combined molding process.
Background art:
in order to improve the performance of accessories in the existing automobile products, carbon fibers are introduced into the automobile products, but due to the particularity of the carbon fiber products, the forming of buckling positions cannot be completed. In the prior art, the processing treatment of carbon fiber materials is mainly carried out on the surface of carbon fibers by manual modes such as paper pasting, cloth pasting and the like, the surface of a product is uneven, the manual processing efficiency is low, the rejection rate is high, and therefore the processing cost of the carbon fiber materials is high.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provide a forming process for combining carbon fiber with injection molding.
The technical scheme adopted by the invention is as follows: a molding process combining carbon fiber and injection molding comprises the following steps:
step one, a preforming procedure: preprocessing and molding the carbon fiber cloth;
step two: an injection molding process: and putting the carbon fiber cloth which is pre-processed and molded into an injection mold, fixing the carbon fiber cloth by using a vacuum chuck, and closing the mold to inject an injection molding material into the mold to complete the injection molding of the carbon fiber cloth.
Preferably, the preforming process comprises the following steps:
the method comprises the following steps: cutting the carbon fiber cloth into specified sizes according to the requirements of the product;
step two: placing the cut carbon fiber cloth into an oven for baking, baking for 60-90min at 60-70 ℃, and performing pre-forming on the carbon fiber cloth after baking;
step three: preheating a mould on a hot-press forming machine to 38-42 ℃, placing the preformed carbon fiber cloth into the mould, further pressing the carbon fiber cloth into the mould by using a profiling tool, keeping the temperature for 1-5min, carrying out hot pressing on the carbon fiber cloth in the mould by using the hot-press forming machine, heating the mould, and keeping the temperature for 15-30min when the temperature is raised to 130-;
step four: pressurizing the carbon fiber cloth in the mold of the hot-press forming machine, vacuumizing the carbon fiber cloth with the air pressure strength of 10KG, maintaining the vacuum degree for 1-5min when the vacuum degree is not higher than-0.1 MPa, and circulating the pressurizing and vacuumizing operation for 3-5 times;
step five: and (3) reducing the temperature of the mould of the hot-press forming machine to 25-35 ℃, opening the mould and taking out the carbon fiber cloth in the mould.
Preferably, the injection molding process comprises the steps of:
the method comprises the following steps: and (3) edge cutting: cutting the edge of the carbon fiber cloth processed in the preforming procedure, and putting the cut carbon fiber cloth into an injection mold;
step two: an injection molding process: and adsorbing and fixing the carbon fiber cloth by using a vacuum chuck, closing the injection mold, injecting an injection molding material into the mold for injection molding, and demolding and cooling the injection molded product to room temperature.
Preferably, the injection molding material comprises the following components in parts by weight: 80-120 parts of base material, 2-4 parts of sodium lignosulphonate, 3-5 parts of carboxymethyl chitosan and 1-3 parts of zinc dimethyldithiocarbamate.
Preferably, the binder is thermoplastic particles.
Preferably, the thermoplastic particles are selected from: any one, two or more than two of polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyamide, polylactic acid, modified nylon, polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polystyrene, polyether ether ketone and polyvinyl chloride in any proportion.
Preferably, the carbon fiber cloth is selected from: any one of plain weave carbon fibers, twill carbon fibers, and aramid carbon fibers.
The invention has the beneficial effects that: the forming process does not need varnish treatment in the whole treatment process, and does not need to use glue and other impregnation between the carbon fiber and the thermoplastic material, so that the forming process is more environment-friendly. In addition, the forming process greatly reduces the processing cost of the existing carbon fiber cloth, the manufacturing process meets the requirement of environmental protection, and the manufactured product does not have the problems of smell and the like.
The specific implementation mode is as follows:
the invention will be further illustrated with reference to specific examples:
the first embodiment is as follows:
a molding process combining carbon fiber and injection molding comprises the following steps:
step one, a preforming procedure: preprocessing and molding the carbon fiber cloth;
step two: an injection molding process: and putting the carbon fiber cloth which is pre-processed and molded into an injection mold, fixing the carbon fiber cloth by using a vacuum chuck, and closing the mold to inject an injection molding material into the mold to complete the injection molding of the carbon fiber cloth.
The preforming process comprises the following steps:
the method comprises the following steps: cutting the carbon fiber cloth into specified sizes according to the requirements of the product;
step two: placing the cut carbon fiber cloth into an oven for baking, baking for 90min at 60 ℃, and performing pre-forming on the carbon fiber cloth after baking;
step three: preheating a mould on a hot-press forming machine to 38 ℃, putting the preformed carbon fiber cloth into the mould, further pressing the carbon fiber cloth into the mould by using a profiling tool, keeping for 5min, carrying out hot pressing on the carbon fiber cloth in the mould by using the hot-press forming machine, heating the mould, and keeping for 30min when the temperature is raised to 130 ℃;
step four: pressurizing the carbon fiber cloth in the mold of the hot-press forming machine, vacuumizing the carbon fiber cloth with the air pressure strength of 10KG, maintaining the vacuum degree for 1min when the vacuum degree is not higher than-0.1 MPa, and circulating the pressurizing and vacuumizing operation for 3 times;
step five: and (3) reducing the temperature of the mould of the hot-press forming machine to 25 ℃, opening the mould and taking out the carbon fiber cloth in the mould.
The injection molding process comprises the following steps:
the method comprises the following steps: and (3) edge cutting: cutting the edge of the carbon fiber cloth processed in the preforming procedure, and putting the cut carbon fiber cloth into an injection mold;
step two: an injection molding process: and adsorbing and fixing the carbon fiber cloth by using a vacuum chuck, closing the injection mold, injecting an injection molding material into the mold for injection molding, and demolding and cooling the injection molded product to room temperature.
The injection molding material comprises the following components in parts by weight: 80 parts of base material, 2 parts of sodium lignosulphonate, 3 parts of carboxymethyl chitosan and 1 part of zinc dimethyldithiocarbamate.
The base material is thermoplastic plastic particles.
The thermoplastic particles are a 1:1 mixture of polyethylene and polyethylene terephthalate.
The carbon fiber cloth is plain woven carbon fiber.
Example two:
a molding process combining carbon fiber and injection molding comprises the following steps:
step one, a preforming procedure: preprocessing and molding the carbon fiber cloth;
step two: an injection molding process: and putting the carbon fiber cloth which is pre-processed and molded into an injection mold, fixing the carbon fiber cloth by using a vacuum chuck, and closing the mold to inject an injection molding material into the mold to complete the injection molding of the carbon fiber cloth.
The preforming process comprises the following steps:
the method comprises the following steps: cutting the carbon fiber cloth into specified sizes according to the requirements of the product;
step two: placing the cut carbon fiber cloth into an oven for baking, baking for 70min at 65 ℃, and performing the carbon fiber cloth after baking;
step three: preheating a mould on a hot-press forming machine to 40 ℃, putting the preformed carbon fiber cloth into the mould, further pressing the carbon fiber cloth into the mould by using a profiling tool, keeping for 3min, carrying out hot pressing on the carbon fiber cloth in the mould by using the hot-press forming machine, heating the mould, and keeping for 20min when the temperature is raised to 135 ℃;
step four: pressurizing the carbon fiber cloth in the mold of the hot-press forming machine, vacuumizing the carbon fiber cloth with the air pressure strength of 10KG, maintaining the vacuum degree for 3min when the vacuum degree is not higher than-0.1 MPa, and circulating the pressurizing and vacuumizing operation for 4 times;
step five: and (3) reducing the temperature of the mould of the hot-press forming machine to 30 ℃, opening the mould and taking out the carbon fiber cloth in the mould.
The injection molding process comprises the following steps:
the method comprises the following steps: and (3) edge cutting: cutting the edge of the carbon fiber cloth processed in the preforming procedure, and putting the cut carbon fiber cloth into an injection mold;
step two: an injection molding process: and adsorbing and fixing the carbon fiber cloth by using a vacuum chuck, closing the injection mold, injecting an injection molding material into the mold for injection molding, and demolding and cooling the injection molded product to room temperature.
The injection molding material comprises the following components in parts by weight: 100 parts of base material, 3 parts of sodium lignosulphonate, 4 parts of carboxymethyl chitosan and 2 parts of zinc dimethyldithiocarbamate.
The base material is thermoplastic plastic particles.
The thermoplastic particles are a mixture of polypropylene and acrylonitrile-butadiene-styrene copolymer 1: 4.
The carbon fiber cloth is twill carbon fiber.
Example three:
a molding process combining carbon fiber and injection molding comprises the following steps:
step one, a preforming procedure: preprocessing and molding the carbon fiber cloth;
step two: an injection molding process: and putting the carbon fiber cloth which is pre-processed and molded into an injection mold, fixing the carbon fiber cloth by using a vacuum chuck, and closing the mold to inject an injection molding material into the mold to complete the injection molding of the carbon fiber cloth.
The preforming process comprises the following steps:
the method comprises the following steps: cutting the carbon fiber cloth into specified sizes according to the requirements of the product;
step two: placing the cut carbon fiber cloth into an oven for baking, baking for 60min at 70 ℃, and performing the carbon fiber cloth after baking;
step three: preheating a mould on a hot-press forming machine to 42 ℃, putting the preformed carbon fiber cloth into the mould, further pressing the carbon fiber cloth into the mould by using a profiling tool, keeping for 1min, carrying out hot pressing on the carbon fiber cloth in the mould by using the hot-press forming machine, heating the mould, and keeping for 15min when the temperature is raised to 140 ℃;
step four: pressurizing the carbon fiber cloth in the mold of the hot-press forming machine, vacuumizing the carbon fiber cloth with the air pressure strength of 10KG, and circulating the pressurizing and vacuumizing operation for 5 times after the carbon fiber cloth is maintained for 5min when the vacuum degree is not higher than-0.1 MPa;
step five: and (3) reducing the temperature of the mould of the hot-press forming machine to 35 ℃, opening the mould and taking out the carbon fiber cloth in the mould.
The injection molding process comprises the following steps:
the method comprises the following steps: and (3) edge cutting: cutting the edge of the carbon fiber cloth processed in the preforming procedure, and putting the cut carbon fiber cloth into an injection mold;
step two: an injection molding process: and adsorbing and fixing the carbon fiber cloth by using a vacuum chuck, closing the injection mold, injecting an injection molding material into the mold for injection molding, and demolding and cooling the injection molded product to room temperature.
The injection molding material comprises the following components in parts by weight: 120 parts of base material, 4 parts of sodium lignosulphonate, 5 parts of carboxymethyl chitosan and 3 parts of zinc dimethyldithiocarbamate.
The base material is thermoplastic plastic particles.
The thermoplastic plastic particles are a mixture of polyamide, polylactic acid and modified nylon in a ratio of 1:1: 1.
The carbon fiber cloth is aramid fiber carbon fiber.
Use effect experiment:
(1) yellowing resistance test:
the test method comprises the following steps: purchasing a carbon fiber product which is sold in the market and produced by adopting the prior art and takes carbon fiber cloth as an insert for injection molding, cutting the purchased product into samples with the size of 70mm x 40mm, taking the cut samples as a control group, testing the products prepared in the first embodiment to the third embodiment of the invention by using an anti-yellowing testing machine, cutting the products prepared in the first embodiment to the third embodiment of the invention into samples with the size of 70mm x 40mm, wherein the cut samples prepared in the first embodiment are marked as a first sample, the cut samples prepared in the second embodiment are marked as a second sample, the cut samples prepared in the third embodiment are marked as a third sample, then placing the samples of the first to third samples and the control group on a rotating disc of the anti-yellowing testing machine, wherein gaps are needed among the four samples and cannot be superposed with each other, starting a power supply of the anti-yellowing testing machine, setting the testing temperature at 150 ℃, after the temperature reaches a set value, turning on an irradiation light source to the strongest level, starting a turntable, testing for 10 hours, observing the change condition of the sample, observing whether the tested sample has cracking, discoloring or bubbling phenomena, and recording the change result in the following table:
Figure BDA0002323428880000091
as can be seen from the above table, the products prepared in the first to third embodiments of the present invention have excellent yellowing resistance and better deformation retention performance, and compared with the products prepared by the existing carbon fiber and injection molding combination process, the products prepared in the present invention have high bonding strength, and the thermoplastic layer and the carbon fiber layer do not fall off or crack under the condition of soaking the carbon fiber cloth without using a bonding agent and under a certain temperature and illumination condition, so that the products have high bonding strength, and can meet the requirements of the existing products such as automobile accessories and helmets on material durability and yellowing resistance. The applicant speculates that the adhesion and bridging between the thermoplastic layer and the carbon fiber cloth layer are realized through macromolecules due to the addition of sodium lignosulfonate, carboxymethyl chitosan and zinc dimethyldithiocarbamate to the base material during injection molding, so that the thermoplastic layer and the carbon fiber layer can be in seamless connection, and the adhesion strength is high.
(2) And (3) odor test:
the test method comprises the following steps: cutting the residual sample after the yellowing resistance test into small pieces with the same size, wherein the sample prepared after cutting the product in the first embodiment is the sample I, the sample prepared after cutting the product in the second embodiment is the sample II, the sample prepared after cutting the product in the third embodiment is the sample III, and the sample prepared after cutting the sample purchased in the market is the control group. And then respectively placing the sample I, the sample II, the sample III and the control component into a sealed bottle without odor, placing the sealed bottle into an oven or a heating furnace at 80 ℃ for heating for 2 hours, taking out the bottle for testing, and allowing each odor judge to evaluate the odor, wherein the average value of the five judges is the detection result.
And (4) testing standard: the product odor evaluation criteria are divided into six grades: odorless, score 1; slightly odorous, scored 2; tasteless, but not irritating, and scored 3; pungent odor, score 4; strong pungent odor, score 5; there was an intolerable odor, which was scored 6. Five odor judges are allowed to score the four samples according to the scoring standards, and the specific scoring standards are shown in the following table:
test set Scoring (mean value)
Sample No 1
Sample No. 2 1
Sample No. three 1
Control group 3.4 points
Because the injection molding process does not use glue water and the like to soak the carbon fiber cloth and does not carry out varnish treatment on the manufactured product, the smell of the manufactured product is obviously less than that of the product manufactured by the process in the prior art. Therefore, the forming process has better environmental protection performance, and the smell of the product and the harm to users are less.
In conclusion, the forming process disclosed by the invention does not need varnish treatment in the whole treatment process, and does not need to use glue or the like for impregnation between the carbon fibers and the thermoplastic material, so that the forming process is more environment-friendly. In addition, the forming process greatly reduces the processing cost of the existing carbon fiber cloth, the manufacturing process meets the requirement of environmental protection, and the manufactured product does not have the problems of smell and the like.
Various other changes and modifications to the above embodiments and concepts will become apparent to those skilled in the art, and all such changes and modifications are intended to be included within the scope of the present invention as defined in the appended claims.

Claims (7)

1. A forming process combining carbon fiber and injection molding is characterized in that: the process comprises the following steps:
step one, a preforming procedure: preprocessing and molding the carbon fiber cloth;
step two: an injection molding process: and putting the carbon fiber cloth which is pre-processed and molded into an injection mold, fixing the carbon fiber cloth by using a vacuum chuck, and closing the mold to inject an injection molding material into the mold to complete the injection molding of the carbon fiber cloth.
2. The carbon fiber and injection molding combined molding process according to claim 1, characterized in that: the preforming process comprises the following steps:
the method comprises the following steps: cutting the carbon fiber cloth into specified sizes according to the requirements of the product;
step two: placing the cut carbon fiber cloth into an oven for baking, baking for 60-90min at 60-70 ℃, and performing pre-forming on the carbon fiber cloth after baking;
step three: preheating a mould on a hot-press forming machine to 38-42 ℃, placing the preformed carbon fiber cloth into the mould, further pressing the carbon fiber cloth into the mould by using a profiling tool, keeping the temperature for 1-5min, carrying out hot pressing on the carbon fiber cloth in the mould by using the hot-press forming machine, heating the mould, and keeping the temperature for 15-30min when the temperature is raised to 130-;
step four: pressurizing the carbon fiber cloth in the mold of the hot-press forming machine, vacuumizing the carbon fiber cloth with the air pressure strength of 10KG, maintaining the vacuum degree for 1-5min when the vacuum degree is not higher than-0.1 MPa, and circulating the pressurizing and vacuumizing operation for 3-5 times;
step five: and (3) reducing the temperature of the mould of the hot-press forming machine to 25-35 ℃, opening the mould and taking out the carbon fiber cloth in the mould.
3. The carbon fiber and injection molding combined molding process according to claim 1, characterized in that: the injection molding process comprises the following steps:
the method comprises the following steps: and (3) edge cutting: cutting the edge of the carbon fiber cloth processed in the preforming procedure, and putting the cut carbon fiber cloth into an injection mold;
step two: an injection molding process: and adsorbing and fixing the carbon fiber cloth by using a vacuum chuck, closing the injection mold, injecting an injection molding material into the mold for injection molding, and demolding and cooling the injection molded product to room temperature.
4. The carbon fiber and injection molding combined molding process according to claim 1, characterized in that: the injection molding material comprises the following components in parts by weight: 80-120 parts of base material, 2-4 parts of sodium lignosulphonate, 3-5 parts of carboxymethyl chitosan and 1-3 parts of zinc dimethyldithiocarbamate.
5. The carbon fiber and injection molding combined forming process according to claim 4, characterized in that: the base material is thermoplastic plastic particles.
6. The carbon fiber and injection molding combined forming process according to claim 5, characterized in that: the thermoplastic particles are selected from: any one, two or more than two of polyethylene, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyamide, polylactic acid, modified nylon, polymethyl methacrylate, polycarbonate, polyethylene terephthalate, polystyrene, polyether ether ketone and polyvinyl chloride in any proportion.
7. The carbon fiber and injection molding combined molding process according to claim 1, characterized in that: the carbon fiber cloth is selected from: any one of plain weave carbon fibers, twill carbon fibers, and aramid carbon fibers.
CN201911306972.2A 2019-12-18 2019-12-18 Forming process combining carbon fiber and injection molding Pending CN110962287A (en)

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