CN113291011A - Variable-density thermoplastic composite material sandwich structure and preparation method and application thereof - Google Patents

Variable-density thermoplastic composite material sandwich structure and preparation method and application thereof Download PDF

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Publication number
CN113291011A
CN113291011A CN202110609205.XA CN202110609205A CN113291011A CN 113291011 A CN113291011 A CN 113291011A CN 202110609205 A CN202110609205 A CN 202110609205A CN 113291011 A CN113291011 A CN 113291011A
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sandwich structure
variable
density
thermoplastic composite
variable density
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周晓东
汤溢融
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East China University of Science and Technology
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East China University of Science and Technology
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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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/285—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyethers
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/06—Fixed roofs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
    • B62D29/043—Superstructures
    • 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
    • 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
    • B29L2009/00—Layered products
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • 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
    • B32B2262/101—Glass fibres
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • 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
    • B32B2605/00—Vehicles
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/003—Interior finishings
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars

Abstract

The invention discloses a variable-density thermoplastic composite sandwich structure and a preparation method and application thereof, belonging to the technical field of composite materials. The thermoplastic composite sandwich structure comprises panels and a variable-density sandwich layer positioned between the panels, wherein a continuous fiber fabric reinforced thermoplastic resin sheet is used as the panel, an expanded long fiber reinforced thermoplastic resin sheet is used as the variable-density sandwich layer, and the thermoplastic composite sandwich structure is obtained by cold-pressing and shaping after hot-pressing and curing under the conditions of heating and pressurizing. The thermoplastic composite sandwich structure has the characteristics of light weight, variable density, safety and environmental protection, and can be used for occasions such as automobile interior trims, bus top plates or notebook computer rear covers.

Description

Variable-density thermoplastic composite material sandwich structure and preparation method and application thereof
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a thermoplastic composite material sandwich structure with variable density as well as a preparation method and application thereof.
Background
Composite sandwich structures are generally formed by using plates with small thickness as panels and using materials with large thickness and small density as core materials, such as honeycomb sandwich structures, foam sandwich structures, light wood sandwich structures, and the like. Generally, the material used for the panel has excellent mechanical properties, and the low-density core materials have a supporting function, so that the panel can better maintain elastic stability when being stressed. By reasonably selecting the forms of different materials, various different performances such as excellent bending rigidity, sound absorption and heat insulation, variable density and the like can be endowed to the sandwich structure, so that the application of the sandwich structure is expanded.
Common composite sandwich structure panels are mainly made of single material systems and are formed by gluing or co-curing, but the single material systems cannot meet the requirements of mechanical properties, physical properties, environment and the like in many occasions, and the upper panel and the lower panel are mostly made of thermosetting resin, so that the panels are integrally formed after thermosetting is facilitated, the mechanical properties are good, and the defects of large density, difficulty in recycling and the like exist. The common glass fiber mat reinforced thermoplastic composite material (GMT) can be expanded in the thickness direction when heated to a temperature above the melting point, so that the density is changed, the density of the material can be greatly reduced while enough mechanical properties can be kept after cooling and shaping, and the material can well play a role of a sandwich core layer of a sandwich structure. However, in the conventional GMT, polypropylene (PP), Polyamide (PA) and the like are used as base materials, and the limitation is large in the process of selecting a wrapper material, so that the requirements of various application fields are met by better improving the performance of a composite material sandwich structure, and the development of a lightweight and variable-density thermoplastic composite material sandwich structure is urgently needed.
Disclosure of Invention
In order to overcome the above disadvantages of the prior art, a first object of the present invention is to provide a variable density thermoplastic composite sandwich structure, which combines a continuous fiber fabric reinforced thermoplastic resin and an expanded long fiber reinforced thermoplastic resin, and has excellent properties of light weight, variable density, safety and environmental protection.
The second purpose of the invention is to provide a preparation method of the thermoplastic composite sandwich structure, which is obtained by cold pressing and shaping after hot pressing and curing of the face plates and the variable-density sandwich layer positioned between the face plates.
The second purpose of the invention is to provide the application of the thermoplastic composite sandwich structure in automobile interior trim, bus top plate or notebook computer rear cover.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a thermoplastic composite sandwich structure with variable density, which comprises face plates and a sandwich layer with variable density, wherein the sandwich layer with variable density is positioned between the face plates; the panel is a continuous fiber fabric reinforced thermoplastic resin plate, and the variable-density sandwich layer is an expanded long fiber reinforced thermoplastic resin sheet.
Preferably, the thermoplastic resin used in the variable density core layer is selected from Powdered Polyphenylene Sulfide (PPS) or Polyetheretherketone (PEEK) in an amount of 40 wt% to 60 wt%.
Preferably, the length of the long fiber in the variable density sandwich layer is 9-18 mm, the addition amount is 40-60 wt%, and the long fiber is selected from one or more of Glass Fiber (GF), Carbon Fiber (CF), basalt fiber (GBF) and Aramid Fiber (AF).
Preferably, the thermoplastic resin used in the panel is Polycarbonate (PC) in an amount of 30 wt% to 70 wt%.
Preferably, the continuous fiber fabric adopted in the panel is selected from glass fiber fabric or carbon fiber fabric, and the adding amount is 30-70 wt%.
The thermoplastic composite sandwich structure has the following advantages: lightweight, variable density and safe and environment-friendly.
The invention also provides a preparation method of the thermoplastic composite material sandwich structure, which comprises the following steps:
(1) adding water and thermoplastic resin powder into a wet dispersion-stirring device, stirring to form a suspension, adding long fibers and a composite surfactant, continuously stirring for 10-20min, stopping stirring, and standing for waiting for the mixture to settle;
(2) after foams generated by the composite surfactant are eliminated, taking out the bottom precipitate, and drying the bottom precipitate to constant weight by an oven at 105 ℃ and 110 ℃ to obtain a felt body;
(3) heating the felt body dried in the step (2) to a temperature higher than the melting point temperature, carrying out expansion treatment for 8-15 min, determining the shaping thickness of the expanded felt body to be 4-10 mm through a die, and carrying out cold pressing and shaping to obtain a long fiber reinforced thermoplastic resin sheet with variable density;
(4) and (3) taking the continuous fiber fabric reinforced thermoplastic resin plate as a panel, taking the long fiber reinforced thermoplastic resin sheet with variable density in the step (3) as a sandwich layer with variable density, stacking the sandwich layer in order, carrying out hot-pressing solidification for 60-120 s under the conditions that the heating temperature is 260-270 ℃ and the pressure is 1-2 MPa, and quickly transferring the sandwich layer to a cold press for cold pressing and shaping under the condition that the pressure is 1-2 MPa to obtain the thermoplastic composite sandwich structure.
Preferably, in the step (1), the dosage of the composite surfactant is 30-60 mg/L, and the composite surfactant is prepared by compounding an anionic surfactant and a nonionic surfactant in a mass ratio of 1: 4.
Preferably, in the step (3), the felt body is heated to 325 ℃ for puffing treatment for 10 min.
Preferably, in the step (4), the thermoplastic composite sandwich structure is obtained by hot-pressing and curing the panel and the variable-density sandwich layer for 90 seconds at the temperature of 265 ℃ and the pressure of 1.5MPa, and quickly transferring the panel and the variable-density sandwich layer to a cold press for cold-pressing and shaping at the pressure of 1.5 MPa.
The invention also provides application of the thermoplastic composite sandwich structure in automobile interior trim, bus top plates or notebook computer rear covers.
Compared with the prior art, the invention has the beneficial effects that: the thermoplastic composite sandwich structure has the characteristics of light weight, variable density, safety and environmental protection, is obtained by performing hot pressing and solidification on the panels and the variable density sandwich layer positioned between the panels and then performing cold pressing and shaping, has simple process, is easy for large-scale industrial production, can be used for occasions such as automobile interiors, bus roofs or notebook computer rear covers and the like, and widens the application range of the composite material with the sandwich structure.
The above-described and other features, aspects, and advantages of the present invention will become more apparent with reference to the following detailed description.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a morphology chart of a sandwich structure of the thermoplastic composite material with variable density in the example.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments without any inventive step, are within the scope of protection of the invention.
The variable density thermoplastic composite sandwich structure of the following examples includes face sheets and a variable density sandwich layer between the face sheets, with the continuous fiber fabric reinforced thermoplastic resin sheet as the face sheet and the expanded long fiber reinforced thermoplastic resin sheet as the variable density sandwich layer. In some embodiments, the thermoplastic resin employed in the variable density core layer is selected from powdered polyphenylene sulfide or polyetheretherketone, which may be added in an amount of 40 wt% to 60 wt%; the length of the long fiber in the variable-density sandwich layer can be 9-18 mm, the addition amount can be 40-60 wt%, and the long fiber is selected from one or the combination of more than two of glass fiber, carbon fiber, basalt fiber or aramid fiber; in some embodiments, the thermoplastic resin used in the panels is polycarbonate (melt temperature around 265 ℃), added in an amount of 30 wt% to 70 wt%; the continuous fiber fabric is selected from glass fiber fabric or carbon fiber fabric, and the adding amount can be 30-70 wt%.
The sandwich structure of the thermoplastic composite material with variable density in the following examples is obtained by a preparation method comprising the following steps:
(1) adding water and thermoplastic resin powder into a wet dispersion-stirring device, stirring to form a suspension, adding long fibers and a composite surfactant, continuously stirring for 10-20min, stopping stirring, and standing for waiting for the mixture to settle;
(2) after foams generated by the composite surfactant are eliminated, taking out the bottom precipitate, and drying the bottom precipitate to constant weight by an oven 105 at 110 ℃ to obtain a felt body;
(3) heating the felt body dried in the step (2) to a temperature higher than the melting point temperature, carrying out expansion treatment for 8-15 min, determining the shaping thickness of the expanded felt body to be 4-10 mm through a die, and carrying out cold pressing and shaping to obtain a long fiber reinforced thermoplastic resin sheet with variable density;
(4) and (3) taking the continuous fiber fabric reinforced thermoplastic resin plate as a panel, taking the long fiber reinforced thermoplastic resin sheet with variable density in the step (3) as a sandwich layer with variable density, stacking the layers in order, carrying out hot-pressing solidification for 60-120 s under the conditions that the heating temperature is 260-270 ℃ and the pressure is 1-2 MPa, quickly transferring the layers to a cold press, and carrying out cold-pressing shaping under the condition that the pressure is 1-2 MPa to obtain the thermoplastic composite sandwich structure.
In some embodiments, the dosage of the composite surfactant is 30-60 mg/L, and the composite surfactant is prepared by compounding an anionic surfactant and a nonionic surfactant in a mass ratio of 1: 4.
In some embodiments, in step (3), the mat is heated to 325 ℃ for 10min of puffing.
In some embodiments, in step (4), the panel and the variable density sandwich layer are hot-pressed and cured for 90 seconds at a temperature of 265 ℃ and a pressure of 1.5MPa, quickly transferred to a cold press and cold-pressed and shaped at a pressure of 1.5MPa to obtain the variable density thermoplastic composite sandwich structure.
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
In this embodiment, the preparation of the thermoplastic composite sandwich structure with variable density comprises the following steps: adding a proper amount of water and 50 wt% of polyphenylene sulfide powder into a wet dispersion-stirring device, stirring to form a suspension, adding 50 wt% of glass fiber with the cutting length of 15mm and 50mg/L of a mixture of a nonionic surfactant and an anionic surfactant according to the mass ratio of 4: 1, continuously stirring the compounded composite surfactant for 15min, stopping stirring, and standing for waiting for the mixture to settle; and after foams generated by the composite surfactant are eliminated, taking out the bottom precipitate, and drying the bottom precipitate to constant weight by using an oven at 108 ℃ to obtain the felt body. Heating the dried felt body in a die on a flat vulcanizing machine to 325 ℃ for 10min of expansion treatment, and performing cold pressing and shaping after the expansion treated felt body is determined to be 5mm in shaping thickness through the die to obtain a long fiber reinforced thermoplastic resin sheet with variable density; the continuous fiber fabric reinforced polycarbonate sheet is used as a panel, the long fiber reinforced thermoplastic resin sheet with variable density is used as a sandwich layer with variable density, the stack is orderly stacked, the hot pressing and curing are carried out for 90s under the conditions that the heating temperature is 265 ℃ and the pressure is 1.5MPa, the stack is quickly transferred to a cold press, and the stack is subjected to cold pressing and shaping under the condition that the pressure is 1.5MPa, so that the thermoplastic composite sandwich structure with variable density is obtained, as shown in figure 1.
Example 2
In this embodiment, the preparation of the thermoplastic composite sandwich structure with variable density comprises the following steps: adding a proper amount of water and 50 wt% of polyether-ether-ketone powder into a wet dispersion-stirring device, stirring to form a suspension, adding 50 wt% of glass fiber with the cutting length of 15mm and 50mg/L of a mixture of a nonionic surfactant and an anionic surfactant according to the mass ratio of 4: 1, continuously stirring the compounded composite surfactant for 15min, stopping stirring, and standing for waiting for the mixture to settle; and after foams generated by the composite surfactant are eliminated, taking out the bottom precipitate, and drying the bottom precipitate to constant weight by using an oven at 108 ℃ to obtain the felt body. Heating the dried felt body in a die on a flat vulcanizing machine to 325 ℃ for 10min of expansion treatment, and performing cold pressing and shaping after the expansion treated felt body is determined to be 8mm in shaping thickness through the die to obtain a long fiber reinforced thermoplastic resin sheet with variable density; the continuous fiber fabric reinforced polycarbonate sheet is used as a panel, the long fiber reinforced thermoplastic resin sheet with variable density is used as a sandwich layer with variable density, the stack is orderly stacked, the hot pressing and curing are carried out for 90s under the conditions that the heating temperature is 265 ℃ and the pressure is 1.5MPa, the stack is quickly transferred to a cold press, and the stack is subjected to cold pressing and shaping under the condition that the pressure is 1.5MPa, so that the thermoplastic composite sandwich structure with variable density is obtained.

Claims (10)

1. A variable density thermoplastic composite sandwich structure comprising face sheets and a variable density core layer located between said face sheets; the panel is a continuous fiber fabric reinforced thermoplastic resin plate, and the variable-density sandwich layer is an expanded long fiber reinforced thermoplastic resin sheet.
2. The variable density thermoplastic composite sandwich structure of claim 1, wherein the thermoplastic resin used in the variable density sandwich layer is selected from Powdered Polyphenylene Sulfide (PPS) or Polyetheretherketone (PEEK) in an amount of 40 wt% to 60 wt%.
3. The variable density thermoplastic composite sandwich structure of claim 1, wherein the long fibers in the variable density sandwich layer have a length of 9-18 mm and are added in an amount of 40 wt% to 60 wt%.
4. The variable density thermoplastic composite sandwich structure of claim 3, wherein the long fibers are selected from one or a combination of two or more of Glass Fibers (GF), Carbon Fibers (CF), basalt fibers (GBF) or Aramid Fibers (AF).
5. The variable density thermoplastic composite sandwich structure of claim 1, wherein the thermoplastic resin used in the face sheets is Polycarbonate (PC) in an amount of 30 wt% to 70 wt%.
6. The sandwich structure of variable density thermoplastic composite according to claim 1, wherein the continuous fiber fabric used in the face sheets is selected from glass fiber fabric or carbon fiber fabric, and the addition amount is 30 wt% to 70 wt%.
7. The method for preparing the thermoplastic composite sandwich structure according to any one of claims 1 to 6, comprising the following steps:
(1) adding water and thermoplastic resin powder into a wet dispersion-stirring device, stirring to form a suspension, adding long fibers and a composite surfactant, continuously stirring for 10-20min, stopping stirring, and standing for waiting for the mixture to settle;
(2) after foams generated by the composite surfactant are eliminated, taking out the bottom precipitate, and drying the bottom precipitate to constant weight by an oven at 105 ℃ and 110 ℃ to obtain a felt body;
(3) heating the felt body dried in the step (2) to a temperature higher than the melting point temperature, carrying out expansion treatment for 8-15 min, determining the shaping thickness of the expanded felt body to be 4-10 mm through a die, and carrying out cold pressing and shaping to obtain a long fiber reinforced thermoplastic resin sheet with variable density;
(4) and (3) taking the continuous fiber fabric reinforced thermoplastic resin plate as a panel, taking the long fiber reinforced thermoplastic resin sheet with variable density in the step (3) as a sandwich layer with variable density, stacking the sandwich layer in order, carrying out hot-pressing solidification for 60-120 s under the conditions that the heating temperature is 260-270 ℃ and the pressure is 1-2 MPa, and quickly transferring the sandwich layer to a cold press for cold pressing and shaping under the condition that the pressure is 1-2 MPa to obtain the thermoplastic composite sandwich structure.
8. The method for preparing the thermoplastic composite sandwich structure according to claim 7, wherein in the step (1), the amount of the composite surfactant is 30-60 mg/L, and the composite surfactant is prepared by compounding an anionic surfactant and a nonionic surfactant in a mass ratio of 1: 4.
9. The method for preparing the thermoplastic composite sandwich structure of claim 7, wherein,
in the step (3), the felt body is heated to 325 ℃ and is subjected to swelling treatment for 10 min; and/or
In the step (4), the thermoplastic composite sandwich structure is obtained by hot-pressing and curing the panel and the variable-density sandwich layer for 90s at the temperature of 265 ℃ and under the pressure of 1.5MPa, and quickly transferring the panel and the variable-density sandwich layer to a cold press for cold pressing and shaping under the pressure of 1.5 MPa.
10. Use of the thermoplastic composite sandwich structure of any of claims 1 to 6 in automotive interiors, bus roofs or laptop back covers.
CN202110609205.XA 2021-06-01 2021-06-01 Variable-density thermoplastic composite material sandwich structure and preparation method and application thereof Pending CN113291011A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08230114A (en) * 1995-03-01 1996-09-10 Kawasaki Steel Corp Paper machine-made stampable sheet, lightweight stampable sheet molding and lightweight stampable sheet skin-laminated product
CN104781317A (en) * 2012-12-26 2015-07-15 东丽株式会社 Fiber-reinforced resin sheet, integrated molded product and process for producing same
CN105667014A (en) * 2016-03-31 2016-06-15 广州金发碳纤维新材料发展有限公司 Passenger car floor
CN106183266A (en) * 2016-07-04 2016-12-07 江苏科悦新材料有限公司 A kind of foaming sandwich material and manufacture method thereof and application

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08230114A (en) * 1995-03-01 1996-09-10 Kawasaki Steel Corp Paper machine-made stampable sheet, lightweight stampable sheet molding and lightweight stampable sheet skin-laminated product
CN104781317A (en) * 2012-12-26 2015-07-15 东丽株式会社 Fiber-reinforced resin sheet, integrated molded product and process for producing same
CN105667014A (en) * 2016-03-31 2016-06-15 广州金发碳纤维新材料发展有限公司 Passenger car floor
CN106183266A (en) * 2016-07-04 2016-12-07 江苏科悦新材料有限公司 A kind of foaming sandwich material and manufacture method thereof and application

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Application publication date: 20210824