CN118306032A - PA6 low-gram-weight carbon fiber widening woven fabric thermoplastic plate and manufacturing method thereof - Google Patents
PA6 low-gram-weight carbon fiber widening woven fabric thermoplastic plate and manufacturing method thereof Download PDFInfo
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- CN118306032A CN118306032A CN202410674635.3A CN202410674635A CN118306032A CN 118306032 A CN118306032 A CN 118306032A CN 202410674635 A CN202410674635 A CN 202410674635A CN 118306032 A CN118306032 A CN 118306032A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 135
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 134
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 45
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 45
- 239000002759 woven fabric Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000004744 fabric Substances 0.000 claims abstract description 78
- 239000002131 composite material Substances 0.000 claims abstract description 51
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000007723 die pressing method Methods 0.000 claims abstract description 6
- 238000007731 hot pressing Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000004321 preservation Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- 239000002390 adhesive tape Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 2
- 229920002292 Nylon 6 Polymers 0.000 description 86
- 238000012360 testing method Methods 0.000 description 31
- 239000002994 raw material Substances 0.000 description 20
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- 230000006378 damage Effects 0.000 description 9
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 8
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- 239000000805 composite resin Substances 0.000 description 2
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- 238000003475 lamination Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000011208 reinforced composite material Substances 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 238000005056 compaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 229920002492 poly(sulfone) Polymers 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
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- 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
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
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- 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
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
- B29B15/122—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
- B29B15/125—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex by dipping
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- 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
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
- B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
- B29B15/14—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length of filaments or wires
-
- 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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C37/0067—Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other
-
- 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
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
- B32B2260/023—Two or more layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Robotics (AREA)
- Laminated Bodies (AREA)
Abstract
The application relates to a PA6 low gram weight carbon fiber stretching woven fabric thermoplastic plate and a manufacturing method thereof, wherein the manufacturing method comprises the following steps of S1, alternately paving and pasting a carbon fiber fabric and a PA6 film according to the sequence of the PA6 film/the carbon fiber fabric/the PA6 film to obtain a composite material; s2, placing the composite material paved in the step S1 into a die, placing the die on hot pressing equipment with adjustable temperature and pressure, and performing die pressing on the paved composite material, wherein the die pressing step comprises three steps of a heating-up stage, a heat-preserving and pressure-maintaining stage and a cooling and demoulding stage, and the prepared PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate has excellent performance, and has a tensile strength of 0 DEG and a tensile strength of 45 DEG which are greatly higher than those of the existing products.
Description
Technical Field
The application relates to the field of carbon fiber composite materials, in particular to a PA6 low-gram-weight carbon fiber widening woven fabric thermoplastic plate and a manufacturing method thereof.
Background
Carbon fiber is a polymer material with excellent physical and chemical properties such as light weight, high strength, acid and alkali corrosion resistance and the like. Carbon fibers are generally used as reinforcement to reinforce matrixes such as resin and the like to prepare composite materials, so that the strength of the materials is greatly improved.
There are mainly two types of thermoplastic and thermosetting composite materials, depending on the resin classification used for the carbon fiber reinforced composite material. In the past, thermosetting resin matrixes are basically selected for preparing carbon fiber reinforced composite materials, and thermoplastics only occupy a small part. Thermosetting resins are commonly used because of their strength and structural characteristics, and have been produced on a large scale in the industrial field. After the thermosetting resin is processed and molded, the three-dimensional net structure has better strength, heat resistance and chemical corrosion resistance, and can fully bear the high performance requirement of the composite material on the matrix, but the thermosetting resin still has a plurality of obvious defects which cannot be remedied, and the thermosetting resin has low molding speed and other reasons, so that the pollution of the thermosetting resin to the environment is a fatal injury which limits the use of the thermosetting resin at present. With the gradual treatment of increasingly urgent environmental pollution in the world, composite materials also meet the time requirements of sustainable development. Performance requirements have not been met as the only reference condition when using composite materials. The production of novel composite materials which not only can meet the traditional structural requirements but also can reduce environmental pollution as much as possible is needed in various countries.
It is against this background that thermoplastic resin composites are emerging. The thermoplastic resin is heated and melted, and the property of cooling crystallization hardening can be suitable for rapid processing to prepare products with complex appearance, and has low cost and recycling property. In the first use of carbon fibers for resin compounding, many attempts have been made to carbon fiber reinforced thermoplastic resin Composites (CFRTP) based on thermoplastic resins (e.g., polysulfone-based resins), which have many excellent properties including high strength and modulus, creep resistance, fatigue resistance, corrosion resistance, abrasion resistance, excellent vibration damping characteristics, and the like. CFRTP composites also have many advantages that are not comparable to thermoset resin composites:
(1) The prepared prepreg has stable performance and is not stored in a special environment for a limited period;
(2) The CFRTP composite material is simple and feasible in production flow and easy to automatically perform running water operation;
(3) Thermoplastic resins are not three-dimensional network structures but are generally linear crystalline molecular chain structures, and have good toughness, chemical corrosion resistance and impact resistance;
(4) The thermoplastic resin has good heat resistance under high temperature environment so as to stabilize the mechanical strength of the composite material;
(5) The thermoplastic resin can be completely recycled through heating and melting, and has little pollution to ecological environment.
CFRTP composites have received considerable attention in recent years and have become a development hotspot.
Thermoplastic resins have numerous advantages but suffer from disadvantages such as high impregnation difficulties and poor processing flowability.
In the existing method for manufacturing the PA6 (also called nylon 6, polyamide 6 or nylon 6) carbon fiber thermoplastic plate by film lamination and mould pressing, the 0-degree tensile strength (MPa) and the 45-degree tensile strength (MPa) of the PA6 thermoplastic carbon fiber plate product are low, and the production requirements of certain industries cannot be met.
When the ultra-thin PA6 carbon fiber thermoplastic plate is prepared by adopting the low-gram-weight carbon fiber woven fabric, the carbon fiber woven fabric cannot be soaked by using the existing manufacturing method, and the PA6 film and the carbon fiber woven fabric in the produced product are layered, so that a qualified product cannot be obtained.
Disclosure of Invention
The application aims at providing a PA6 carbon fiber stretching woven fabric thermoplastic plate and a manufacturing method thereof, and the mechanical properties of the product produced by the method are greatly higher than those of the prior product, and the product is also suitable for manufacturing ultrathin PA6 carbon fiber thermoplastic plates.
Therefore, the application provides a manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate, which comprises the following steps:
S1, alternately paving a carbon fiber fabric and a PA6 film according to the sequence of the PA6 film/the carbon fiber fabric/the PA6 film to obtain a composite material;
S2, placing the composite material paved in the step S1 into a die, placing the die on hot pressing equipment with adjustable temperature and pressure, and performing die pressing on the paved composite material, wherein the die pressing comprises three stages:
and (3) heating: raising the temperature from the room temperature to a predetermined molding temperature at a predetermined raising rate, and applying a first predetermined pressure to the composite material to mold the composite material before the predetermined molding temperature is reached;
and (3) heat preservation and pressure maintaining stages: after the temperature is raised to a preset forming temperature, applying a second preset pressure to the composite material, and preserving heat for a preset time under the second preset pressure, wherein the pressure is provided for ensuring the compaction of the product, the temperature is provided for ensuring the melting of PA6 and the impregnation of carbon cloth;
and (3) cooling and demolding: and (3) maintaining a second preset pressure, and demoulding when the temperature of the composite material is naturally cooled to be lower than the preset demoulding temperature, namely, maintaining the pressure of 45T to 55T, which is equivalent to the pressure of 2.76MPa to 3.37MPa, on the composite material, and demoulding when the temperature of the composite material is naturally cooled to be lower than 80 ℃ to 100 ℃, so that deformation of the composite material caused by no hardening during demoulding can be avoided, and the PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate is obtained.
Wherein the preset forming temperature is 261-270 ℃, the first preset pressure is 0.49-0.61 MPa, the second preset pressure is 2.76-3.37 MPa, and the heat preservation preset time is 10-15 min.
The first preset pressure is 0.49MPa to 0.61MPa, so that mechanical damage to the composite material which is not melted at high pressure can be avoided, and the mechanical property of the plate can be improved.
In the existing method for manufacturing the PA6 (also called nylon 6, polyamide 6 or nylon 6) carbon fiber thermoplastic plate by film lamination and mould pressing, the produced PA6 thermoplastic carbon fiber plate product has low 0-degree tensile strength (MPa) and 45-degree tensile strength (MPa) and cannot meet the production requirements of special industries. The inventors of the present application found that the different choices of heating temperature, pressure range and pressurization time, cooling rate and cooling time of the PA6 film are the main reasons for the low 0 ° tensile strength (MPa) and 45 ° tensile strength (MPa) of the existing PA6 carbon fiber thermoplastic sheet products. The low heating temperature leads the PA6 film to be insufficiently melted, the viscosity of the PA6 can not be reduced, and the carbon fiber impregnation effect is poor; the high heating temperature causes the PA6 film to undergo a decomposition reaction, resulting in a loss of PA6 film performance. The pressure range and the pressing time are not suitable to deform the PA6 carbon fiber thermoplastic sheet product. Improper cooling rates and times will reduce the crystallinity of the PA6 film, resulting in reduced mechanical properties of the PA6 carbon fiber thermoplastic sheet. Based on the above-mentioned shortcomings, the PA6 carbon fiber thermoplastic sheet material production process steps, heating temperature, pressure range and pressurizing time, cooling rate and cooling time in the method of the present application enable the 0 degree tensile strength (MPa) and 45 degree tensile strength (MPa) of the final PA6 carbon fiber thermoplastic sheet material product to be substantially higher than those of the existing products (for example, the products manufactured in the patent application number 201610868440.8, the application name of the application of a carbon fiber woven cloth reinforced thermoplastic resin ultrathin sheet material and a preparation method thereof).
According to some embodiments, the carbon fiber fabric in step S1 is a low gram weight carbon fiber fabric with an areal density of 200 g/square meter or less, and the thickness is very thin, and compared with the prior art, the weight of the PA6 carbon fiber thermoplastic sheet can be reduced by adopting an ultrathin fabric, and the impregnation time in production can be reduced.
According to some embodiments, the PA6 film thickness in step S1 is 0.03mm-0.2mm, resulting in ultra-thin products with higher performance and wider application range.
The carbon fiber fabric used in the step S1 can be obtained by stretching treatment modes such as air stretching, mechanical stretching or ultrasonic stretching of carbon fiber tows, and the stretched yarns are subjected to a weaving process to form the low-gram-weight stretched fabric, and the carbon fiber tows are manufactured in the prior art and can be purchased in the market, such as T700SC-12K carbon fiber tows of Tooli company.
According to some embodiments, carbon fiber broadened yarns with a width of 16mm are formed by an ultrasonic broadening process using T700SC-12K tows, and the broadened yarns are formed into a low gram weight carbon fiber fabric by a weaving process.
According to some embodiments, wherein the predetermined ramp rate for the ramp up phase of step S2 is 1.5 ℃/min to 2.5 ℃/min.
According to some embodiments, the edge of the carbon fiber fabric used in the step S1 is sealed by a high-temperature adhesive tape, so that the deformation of the carbon fabric is avoided, and the sealing width is 5mm-10mm.
According to some embodiments, the alternate paving mode in step S1 is centrosymmetric paving, and the purpose of centrosymmetric paving is to ensure centrosymmetric PA6 film and carbon fiber fabric, and uniform impregnation is achieved, so that warping of the board is avoided.
According to some embodiments, the method further comprises the steps of: the composite material paved in the step S1 is sealed by aluminum foil, so that the PA6 film is prevented from being oxidized at high temperature after being contacted with excessive air, and the qualification rate of products can be improved compared with the prior art.
According to some embodiments, the die is provided with the limiting block, the difference between the thickness controlled by the limiting block and the thicknesses of the composite material and the demolding material is 0.09-0.12mm, the raw materials can be compacted without gaps, and the qualification rate of products can be improved compared with the prior art.
According to some embodiments, the composite material laid in step S1 comprises 3 to 15 layers, wherein the thermoplastic sheet material of 3 layers has a thin thickness and high strength, and can be applied in the case of aircraft manufacturing, machinery and the like, which need ultrathin sheet materials.
According to some embodiments, in step S2, stacking a plurality of composite materials laid in step S1 into a mold, separating adjacent composite material blocks by using a mold release material, such as polytetrafluoroethylene mold release cloth, and molding the stacked composite materials, the synchronous production of at least 20 PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plates can be realized, and compared with the prior art, the production efficiency is improved, the cost is reduced, and the labor is saved.
The application also relates to a PA6 low-gram-weight carbon fiber widening woven fabric thermoplastic plate prepared by the manufacturing method, which comprises a PA6 film serving as a matrix material and a low-gram-weight carbon fiber fabric serving as a reinforcing material, wherein the PA6 film and the carbon fiber fabric are alternately overlapped.
The PA6 carbon fiber stretching woven fabric thermoplastic plate prepared by the manufacturing method has the tensile strength of 485-1043MPa at 0 DEG and 141-217MPa at 45 deg.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of the present application. For purposes of illustration, the figures may not be drawn to scale entirely.
Fig. 1 is a schematic structural diagram of a PA6 carbon fiber broadened woven thermoplastic sheet according to the present invention, a representing PA6 and B representing a carbon fiber fabric.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments according to the present application. Rather, they are merely examples of apparatus consistent with aspects of the application as detailed in the accompanying claims.
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments according to the present application. Rather, they are merely examples of apparatus consistent with aspects of the application as detailed in the accompanying claims.
Interpretation of the terms
PA6, called Nylon 6, polyamide 6
The monomer structure is
The demoulding material adopts polytetrafluoroethylene
The structure is that
As shown in fig. 1, the structure of the PA6 carbon fiber stretched woven fabric thermoplastic sheet is shown, a represents PA6, and B represents stretched fabric; PA6 is located above and below the stretch fabric, respectively.
Example 1
A manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate comprises the following steps.
Preparing a carbon fiber fabric: the carbon fiber stretching yarn with the width of 16mm is formed by using T700SC-12K tows through an ultrasonic stretching process, and the carbon fiber stretching yarn is formed into the low-gram-weight carbon fiber fabric through a weaving process, wherein the unit area mass of the carbon fiber fabric is 80g/m 2.
Cutting and edge sealing: and the edge of the carbon fiber fabric is sealed by adopting a high-temperature adhesive tape, so that deformation is avoided.
Paving and wrapping: and (3) symmetrically paving 3 layers of PA6 films (60 g/square meter) with the size of 0.05mm of the cut carbon fiber fabric and the size of the PA6 films being the same as that of the carbon fiber fabric according to the mode of PA6 films/carbon fiber fabric/PA 6 films/symmetrically, wherein the purpose of symmetrically paving is to ensure that the resin layers and the carbon fiber fabric are symmetrical in center, the impregnation is uniform, and the warping of the plate is avoided. All raw materials laid well are sealed with aluminum foil in order to avoid contact with excessive air and PA6 is oxidized at high temperature.
And (3) mold treatment: cleaning the surface of a die, uniformly coating a release agent on the surface of the die, airing or paving polytetrafluoroethylene release cloth on the surface of the die, installing a limiting block with proper thickness, wherein the difference between the thickness controlled by the limiting block and the thickness of the composite material and the thickness of the release material is 0.09-0.12mm, and ensuring that the raw material can be compacted without gaps.
Heating and heat preservation: placing the paved raw materials into a die, placing the die on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding mechanical damage of the materials which are not completely melted under high pressure, wherein the heating rate is 2 ℃/min, the forming temperature is 261 ℃, and preserving heat for 10min under the pressure of 3.37MPa after the forming temperature is raised, namely the forming pressure of the product is 3.37MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding, and obtaining the 3-layer PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate, wherein the average value of 0-degree tensile strength is 4815 MPa, the average value of 45-degree tensile strength is 141MPa, the average value of 0-degree open-pore tensile strength is 247.4MPa, and the average value of 0-degree bolting extrusion strength is 249.3MPa.
Test examples
First, 0 ° tensile property test method:
(1) Sample size: the length of the 0 degree direction test sample is 120mm, the width is consistent with the width of a bundle of stretching yarns (the length of the middle test area is 80mm, and reinforcing sheets are adhered on the two sides of the middle test area in 20 mm)
(2) Stretching rate of 2mm/min
Second, ±45° tensile property test method:
(1) Sample size: the size of the test sample in the 45-degree direction is 12mm 80mm (the length of the middle test area is 40mm, and reinforcing sheets are adhered on the two sides of the middle test area in 20 mm)
(2) Stretching rate: 2mm/min
Thirdly, an open pore tensile property test method comprises the following steps:
(1) Sample size: 280mm long and 36mm wide, and 50mm in reinforcing sheet size
(2) Size of the opening: diameter of 6mm
(3) Loading rate: 2mm/min
Fourthly, a bolt connection extrusion strength performance test method comprises the following steps:
(1) Sample size: the length is 135mm, the width is 36mm, and the length of the cushion block is 75mm
(2) Size of the opening: the diameter is 6mm, and the end distance is 18mm
(3) Loading rate: 2mm/min.
0 ° Tensile strength test data:
Tensile strength test data at 45 °:
0 ° open cell tensile strength test data:
0 ° bolting crush strength test data:
Example 2
A manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate comprises the following steps.
Preparing a carbon fiber fabric: the carbon fiber stretching yarn with the width of 16mm is formed by using T700SC-12K tows through an ultrasonic stretching process, and the carbon fiber stretching yarn is formed into the low-gram-weight carbon fiber fabric through a weaving process, wherein the unit area mass of the carbon fiber fabric is 100g/m 2.
Cutting and edge sealing: and the edge of the carbon fiber fabric is sealed by adopting a high-temperature adhesive tape, so that deformation is avoided.
Paving and wrapping: and (3) symmetrically paving 3 layers of the cut carbon fiber fabric and a 0.05mm PA6 film (60 g/square meter), wherein the size of the PA6 film is the same as that of the carbon fiber fabric, and the symmetrical paving aims to ensure that the resin layer and the carbon fiber fabric are symmetrical in center, the impregnation is uniform and the warping of the plate is avoided. All raw materials laid well are sealed with aluminum foil in order to avoid contact with excessive air and PA6 is oxidized at high temperature.
And (3) mold treatment: cleaning the surface of a die, uniformly coating a release agent on the surface of the die, airing or paving polytetrafluoroethylene release cloth on the surface of the die, installing a limiting block with proper thickness, wherein the difference between the thickness controlled by the limiting block and the thickness of the composite material and the thickness of the release material is 0.09-0.12mm, and ensuring that the raw material can be compacted without gaps.
Heating and heat preservation: placing the paved raw materials into a die, placing the die on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding mechanical damage of the materials which are not completely melted under high pressure, wherein the heating rate is 2 ℃/min, the forming temperature is 265 ℃, and after the forming temperature is raised to the forming temperature, preserving the temperature for 15min under the pressure of 3.06MPa, namely the forming pressure of the product is 3.06MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding, and obtaining the 3-layer PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate, wherein the average value of 0-degree tensile strength is 710 MPa, the average value of 45-degree tensile strength is 142MPa, the average value of 0-degree open-pore tensile strength is 331.9MPa, and the average value of 0-degree bolting extrusion strength is 362.1MPa.
0 ° Tensile strength test data:
Tensile strength test data at 45 °:
0 ° open cell tensile strength test data:
0 ° bolting crush strength test data:
example 3
A manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate comprises the following steps.
Preparing a carbon fiber fabric: the carbon fiber stretching yarn with the width of 16mm is formed by using T700SC-12K tows through an ultrasonic stretching process, and the carbon fiber stretching yarn is formed into a low-gram-weight carbon fiber fabric through a weaving process, wherein the unit volume mass of the carbon fiber fabric is 160g/m 2.
Cutting and edge sealing: and the edge of the carbon fiber fabric is sealed by adopting a high-temperature adhesive tape, so that deformation is avoided.
Paving and wrapping: and (3) symmetrically paving 3 layers of the cut carbon fiber fabric and a 0.05mm PA6 film (60 g/square meter), wherein the size of the PA6 film is the same as that of the carbon fiber fabric, and the symmetrical paving aims to ensure that the resin layer and the carbon fiber fabric are symmetrical in center, the impregnation is uniform and the warping of the plate is avoided. All raw materials laid well are sealed with aluminum foil in order to avoid contact with excessive air and PA6 is oxidized at high temperature.
And (3) mold treatment: cleaning the surface of a die, uniformly coating a release agent on the surface of the die, airing or paving polytetrafluoroethylene release cloth on the surface of the die, installing a limiting block with proper thickness, wherein the difference between the thickness controlled by the limiting block and the thickness of the composite material and the thickness of the release material is 0.09-0.12mm, and ensuring that the raw material can be compacted without gaps.
Heating and heat preservation: placing the paved raw materials into a die, placing the die on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding mechanical damage of the materials which are not completely melted under high pressure, wherein the heating rate is 2 ℃/min, the forming temperature is 270 ℃, and preserving the heat for 15min under the pressure of 2.76MPa after the forming temperature is raised, namely the forming pressure of the product is 2.76MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding, and obtaining the 3-layer PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate, wherein the 0-degree tensile strength is 1043MPa, the 45-degree tensile strength is 156MPa, the 0-degree open pore tensile strength average value is 420.2MPa, and the 0-degree bolting extrusion strength average value is 243.2MPa.
0 ° Tensile strength test data:
Tensile strength test data at 45 °:
0 ° open cell tensile strength test data:
0 ° bolting crush strength test data:
Example 4
A manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate comprises the following steps.
Preparing a carbon fiber fabric: the carbon fiber stretching yarn with the width of 16mm is formed by using T700SC-12K tows through an ultrasonic stretching process, and the carbon fiber stretching yarn is formed into a low-gram-weight carbon fiber fabric through a weaving process, wherein the unit volume mass of the carbon fiber fabric is 80g/m 2.
Cutting and edge sealing: and the edge of the carbon fiber fabric is sealed by adopting a high-temperature adhesive tape, so that deformation is avoided.
Paving and wrapping: and (3) symmetrically paving 5 layers of the cut carbon fiber fabric and a 0.05mm PA6 film (60 g/square meter), wherein the size of the PA6 film is the same as that of the carbon fiber fabric, and the symmetrical paving aims to ensure that the resin layer and the carbon fiber fabric are symmetrical in center, the impregnation is uniform and the warping of the plate is avoided. All raw materials laid well are sealed with aluminum foil in order to avoid contact with excessive air and PA6 is oxidized at high temperature.
And (3) mold treatment: cleaning the surface of a die, uniformly coating a release agent on the surface of the die, airing or paving polytetrafluoroethylene release cloth on the surface of the die, and mounting a limit block with proper thickness, wherein the difference between the thickness controlled by the limit block and the thickness of the composite material and the thickness of the release material is 0.09-0.12mm, so that the raw materials can be compacted without gaps.
Heating and heat preservation: placing the paved raw materials into a die, placing the die on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding mechanical damage of the materials which are not completely melted under high pressure, wherein the heating rate is 2 ℃/min, the forming temperature is 265 ℃, and after the forming temperature is raised to the forming temperature, preserving the temperature for 15min under the pressure of 3.06MPa, namely the forming pressure of the product is 3.06MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding, and obtaining a 5-layer PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate, wherein the 0-degree tensile strength is 792MPa, the 45-degree tensile strength is 172MPa, the 0-degree open pore tensile strength average value is 273.6MPa, and the 0-degree bolting extrusion strength average value is 266.0MPa.
0 ° Tensile strength test data:
Tensile strength test data at 45 °:
0 ° open cell tensile strength test data:
0 ° bolting crush strength test data:
Example 5
A manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate comprises the following steps.
Preparing a carbon fiber fabric: the carbon fiber stretching yarn with the width of 16mm is formed by using T700SC-12K tows through an ultrasonic stretching process, and the carbon fiber stretching yarn is formed into a low-gram-weight carbon fiber fabric through a weaving process, wherein the unit volume mass of the carbon fiber fabric is 80g/m 2.
Cutting and edge sealing: and the edge of the carbon fiber fabric is sealed by adopting a high-temperature adhesive tape, so that deformation is avoided.
Paving and wrapping: and (3) symmetrically paving 15 layers of the cut carbon fiber fabric and a 0.05mm PA6 film (60 g/square meter), wherein the size of the PA6 film is the same as that of the carbon fiber fabric, and the symmetrical paving aims to ensure that the resin layer and the carbon fiber fabric are symmetrical in center, the impregnation is uniform and the warping of the plate is avoided. All raw materials laid well are sealed with aluminum foil in order to avoid contact with excessive air and PA6 is oxidized at high temperature.
And (3) mold treatment: cleaning the surface of a die, uniformly coating a release agent on the surface of the die, airing or paving polytetrafluoroethylene release cloth on the surface of the die, installing a limiting block with proper thickness, wherein the difference between the thickness controlled by the limiting block and the thickness of the composite material and the thickness of the release material is 0.09-0.12mm, and ensuring that the raw material can be compacted without gaps.
Heating and heat preservation: placing the paved raw materials into a die, placing the die on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding mechanical damage of the materials which are not completely melted under high pressure, wherein the heating rate is 2 ℃/min, the forming temperature is 265 ℃, and after the forming temperature is raised to the forming temperature, preserving the temperature for 15min under the pressure of 3.06MPa, namely the forming pressure of the product is 3.06MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding, and demoulding to obtain 15 layers of PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plates, wherein the 0-degree tensile strength is 1033MPa, the 45-degree tensile strength is 217MPa, the 0-degree open pore tensile strength average value is 325.6MPa, and the 0-degree bolting extrusion strength average value is 420.8MPa.
0 ° Tensile strength test data:
Tensile strength test data at 45 °:
0 ° open cell tensile strength test data:
0 ° bolting crush strength test data:
Example 6
A manufacturing method of a PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate comprises the following steps.
Preparing a carbon fiber fabric: the carbon fiber stretching yarn with the width of 16mm is formed by using T700SC-12K tows through an ultrasonic stretching process, and the carbon fiber stretching yarn is formed into a low-gram-weight carbon fiber fabric through a weaving process, wherein the unit volume mass of the carbon fiber fabric is 160g/m 2.
Cutting and edge sealing: and the edge of the carbon fiber fabric is sealed by adopting a high-temperature adhesive tape, so that deformation is avoided.
Paving and wrapping: and (3) symmetrically paving 15 layers of the cut carbon fiber fabric and a 0.05mm PA6 film (60 g/square meter), wherein the size of the PA6 film is the same as that of the carbon fiber fabric, and the symmetrical paving aims to ensure that the resin layer and the carbon fiber fabric are symmetrical in center, the impregnation is uniform and the warping of the plate is avoided. All raw materials laid well are sealed with aluminum foil in order to avoid contact with excessive air and PA6 is oxidized at high temperature.
And (3) mold treatment: cleaning the surface of a die, uniformly coating a release agent on the surface of the die, airing or paving polytetrafluoroethylene release cloth on the surface of the die, installing a limiting block with proper thickness, wherein the difference between the thickness controlled by the limiting block and the thickness of the composite material and the thickness of the release material is 0.09-0.12mm, and ensuring that the raw material can be compacted without gaps.
Heating and heat preservation: placing the paved raw materials into a die, placing the die on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding mechanical damage of the materials which are not completely melted under high pressure, wherein the heating rate is 2 ℃/min, the forming temperature is 265 ℃, and after the forming temperature is raised to the forming temperature, preserving the temperature for 15min under the pressure of 3.06MPa, namely the forming pressure of the product is 3.06MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding, and demoulding to obtain 15 layers of PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plates, wherein the 0-degree tensile strength is 892MPa, the 45-degree tensile strength is 178 MPa, the 0-degree open pore tensile strength average value is 487.1MPa, and the 0-degree bolt connection extrusion strength average value is 390.7MPa.
0 ° Tensile strength test data:
Tensile strength test data at 45 °:
0 ° open cell tensile strength test data:
0 ° bolting crush strength test data:
The application also relates to a PA6 low gram weight carbon fiber stretching woven fabric thermoplastic plate which is prepared by the method and comprises a PA6 film serving as a matrix material and a carbon fiber fabric serving as a reinforcing material which is sandwiched between the PA6 film and the carbon fiber fabric. The 0 degree tensile strength of the plate is 485-1043MPa, and the 45 degree tensile strength is 141-217MPa.
Comparative example
Heating and heat preservation: placing the paved raw materials into a mould, placing the mould on a hot press table with adjustable temperature and pressure, forming at the pressure of 0.61MPa before the room temperature-forming temperature, avoiding the mechanical damage of melting of the materials under high pressure, heating the materials at the rate of 2 ℃/min, forming the materials at the temperature of 220-250 ℃, and preserving the heat for 15min under the pressure of 0-2.5MPa after the materials are heated to the forming temperature, namely the forming pressure of the products is 0-2.5MPa.
Cooling and demoulding: and (3) maintaining the pressure, naturally cooling to below 100 ℃, demoulding to obtain the 3-layer PA6 low-gram-weight carbon fiber stretching woven fabric thermoplastic plate, wherein the 0-degree tensile strength is 240-450MPa, and the 45-degree tensile strength is 50-100MPa.
The other steps are the same as in example 1.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as may be used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
Terms such as "upper," "lower," "left," "right," "front," "back," "thickness," "radial," "axial," and the like, as may be used herein, refer to spatially relative positions for ease of description to describe one feature's relationship to another feature as illustrated in the figures, and are not limited to one position or one spatial orientation. It will be appreciated that the term spatially relative position is intended to encompass different orientations than those depicted in the figures, depending on the product placement location, and is not intended to be limiting. In addition, the term "horizontal" as may be used herein is not entirely equivalent to being oriented perpendicular to the direction of gravity, allowing for some degree of tilt. As used herein, the terms "comprises," "comprising," or the like are intended to cover the inclusion of a stated element or article that is "comprising" or "comprises," but not the exclusion of other elements or articles that may be listed thereafter or equivalents thereof.
It should be appreciated that the terms "first," "second," and the like, as used in this description of the application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.
Claims (12)
1. A method for manufacturing a PA6 low-gram-weight carbon fiber widening woven fabric thermoplastic plate, which is characterized by comprising the following steps:
S1, alternately paving a carbon fiber fabric and a PA6 film according to the sequence of the PA6 film/the carbon fiber fabric/the PA6 film to obtain a composite material;
S2, placing the composite material paved in the step S1 into a die, placing the die on hot pressing equipment with adjustable temperature and pressure, and performing die pressing on the paved composite material, wherein the die pressing comprises three stages:
and (3) heating: raising the temperature from the room temperature to a predetermined molding temperature at a predetermined raising rate, and applying a first predetermined pressure to the composite material to mold the composite material before the predetermined molding temperature is reached;
and (3) heat preservation and pressure maintaining stages: after the temperature is raised to the preset forming temperature, applying a second preset pressure to the composite material, and preserving heat for a preset time under the second preset pressure;
And (3) cooling and demolding: maintaining the second preset pressure, demoulding when the temperature of the composite material is naturally cooled to 80-100 ℃ or below, namely below the preset demoulding temperature,
Wherein the predetermined molding temperature is 261-270 ℃, the first predetermined pressure is 0.49-0.61Mpa, the second predetermined pressure is 2.76-3.37Mpa, and the heat preservation predetermined time is 10-15min.
2. The method of claim 1, wherein the carbon fiber fabric in step S1 is a low gram weight carbon fiber fabric having an areal density of 200 g/square meter or less.
3. The method according to claim 1, wherein the PA6 film thickness in step S1 is 0.03-0.2mm.
4. The method of claim 1, wherein the predetermined ramp rate is 1.5-2.5 ℃/min.
5. The method of claim 1, further comprising the step of: and (2) edge sealing is carried out on the edge of the carbon fiber fabric used in the step (S1) by adopting a high-temperature adhesive tape, wherein the edge sealing width is 5-10mm.
6. The method according to claim 1, wherein the alternating lay-on in step S1 is a centrosymmetric lay-on.
7. The method of claim 1, further comprising the step of: and (3) sealing the composite material paved in the step S1 by using aluminum foil.
8. A method according to claim 1, wherein a plurality of the composite materials laid down in step S1 are stacked in a mould in step S2, adjacent composite material blocks are separated by a mould release material, and the stacked composite materials are moulded.
9. A method according to claim 3, wherein the composite material laid down in step S1 is 3 to 15 layers.
10. The method of claim 8, wherein the die is provided with a limiting block, and the difference between the thickness controlled by the limiting block and the thicknesses of the composite material and the demolding material is 0.09-0.12mm.
11. A PA6 low basis weight carbon fiber stretched woven thermoplastic sheet material made according to the method of any one of claims 1-10, the sheet material comprising PA6 film as a matrix material and a low basis weight carbon fiber fabric as a reinforcement material, wherein the PA6 film and the carbon fiber fabric are alternately stacked.
12. The PA 6-carbon fiber stretched woven thermoplastic sheet material of claim 11, wherein the sheet material has a 0 ° tensile strength of 485-1043MPa and a 45 ° tensile strength of 141-217MPa.
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