A thermoplastic composite film

Abstract

The present invention belongs to the field of thermoplastic resin matrix films, and particularly relates to a thermoplastic composite film. The composite film matrix includes three parts from the outside to the inside: a surface mechanical strength layer, an intermediate grid support layer, and a core hot-melt penetration layer. The surface mechanical strength layer is composed of a high-melting-point thermoplastic resin matrix; the intermediate grid support layer is a hot-melt fiber mesh cloth structure, which provides mechanical support for the entire melt penetration process before the film-like composite matrix and the fiber fabric are hot-melted and infiltrated, ensuring the integrity of the penetration path of the composite film penetration process; the core hot-melt penetration layer is composed of a low-melting-point and low-viscosity thermoplastic resin, which can penetrate between the fiber fabric monofilaments due to its high fluidity during the melt penetration of the entire composite film and the fiber reinforced fabric, ensuring the interface bonding effect between the thermoplastic matrix and the fiber fabric.

Description

Technical Field

[0001] The invention belongs to the field of thermoplastic resin matrix films, and in particular relates to a film-like matrix material composed of thermoplastic resins with a laminated composite structure. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] At present, the preparation of thermoplastic composite materials mainly adopts the key intermediate product - thermoplastic prepreg fabric. Among them, the main process currently used for thermoplastic prepreg fabric is to make it by high-performance fiber unidirectional fabric or two-dimensional woven fabric and molten thermoplastic resin under high temperature pressure load. Commonly used melt impregnation technologies include: screw extrusion injection infiltration composite, fluidized bed powder composite method or thermoplastic film substrate lamination pressure composite method. Among them, the composite method of thermoplastic film substrate and fiber fabric adopts the hot melt process to composite the thermoplastic film resin matrix and the fiber, which is more suitable for continuous production, and the surface uniformity of the film resin is high, and the process feasibility is strong for the impregnation composite effect of the molded prepreg fabric. However, this process has high requirements for the film-forming property of the resin matrix, and the film-forming conditions limit the penetration effect of the resin between the fiber fabric during the hot melt process. Therefore, the fiber interface characteristics of the thermoplastic prepreg fabric of the thermoplastic matrix resin film of a single material are often poor. Summary of the invention

[0004] In order to overcome the above problems, the present invention provides a thermoplastic resin film-like matrix material with a laminated composite structure. The composite film matrix comprises three parts from outside to inside: a surface mechanical strength layer, an intermediate grid support layer and a core hot-melt permeable layer.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] The first aspect of the present invention provides a thermoplastic composite film, comprising: a surface mechanical strength layer, an intermediate grid support layer and a core hot melt penetration layer; the surface mechanical strength layer, the intermediate grid support layer and the core hot melt penetration layer are arranged in sequence from the outside to the inside, the surface mechanical strength layer is composed of a thermoplastic resin matrix, the intermediate grid support layer is composed of a hot melt fiber mesh cloth, and the core hot melt penetration layer is composed of a thermoplastic resin.

[0007] The composite membrane matrix includes three parts from the outside to the inside: a surface mechanical strength layer, an intermediate grid support layer and a core hot-melt permeation layer. The surface mechanical strength layer is composed of a high-melting-point thermoplastic resin matrix, which mainly provides the mechanical strength characteristics of the entire composite membrane structure, and plays a role in the overall structural continuity of the entire composite membrane and the operability of industrial production; the intermediate grid support layer adopts a hot-melt fiber mesh cloth structure, which provides mechanical support for the entire melt-penetration process before the membrane-like composite matrix and the fiber fabric are hot-melted and infiltrated, ensuring the integrity of the permeation path during the composite membrane penetration process; the core hot-melt permeation layer is composed of a low-melting-point and low-viscosity thermoplastic resin, which can penetrate between the fiber fabric monofilaments due to its high fluidity during the melt-penetration process of the entire composite membrane and the fiber reinforced fabric, ensuring the interface bonding effect between the thermoplastic matrix and the fiber fabric.

[0008] The beneficial effects of the present invention are:

[0009] (1) The present invention designs a film-like matrix material with a composite structure and multiple hot melt permeability characteristics, which has great practical significance for improving the process advantages of thermoplastic film-like matrix materials.

[0010] (2) The composite membrane matrix of the present invention includes three parts from the outside to the inside: a surface mechanical strength layer, an intermediate grid support layer and a core hot-melt permeation layer. The surface mechanical strength layer is composed of a high-melting-point thermoplastic resin matrix, which mainly provides the mechanical strength characteristics of the entire composite membrane structure, and plays a role in the overall structural continuity of the entire composite membrane and the operability of industrial production; the intermediate grid support layer is a hot-melt fiber mesh cloth structure, which provides mechanical support for the entire melt-penetration process before the membrane-like composite matrix and the fiber fabric are hot-melted and infiltrated, ensuring the integrity of the permeation path during the composite membrane penetration process; the core hot-melt permeation layer is composed of a low-melting-point and low-viscosity thermoplastic resin, which can penetrate between the fiber fabric monofilaments due to its high fluidity during the melt-penetration process of the entire composite membrane and the fiber reinforced fabric, ensuring the interface bonding effect between the thermoplastic matrix and the fiber fabric.

[0011] (3) The present invention has a simple structure, is easy to operate, has strong practicability, and is easy to mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0013] Figure 1 It is a schematic diagram of the structure of the thermoplastic composite structural membrane of Example 1, wherein the composite membrane consists of three parts: a surface mechanical strength layer 1, an intermediate grid support layer 2 and a core hot-melt penetration layer 3. DETAILED DESCRIPTION

[0014] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0015] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0016] A thermoplastic resin film-shaped matrix material with a laminated composite structure. The composite film matrix comprises three parts from the outside to the inside: a surface mechanical strength layer, an intermediate grid support layer and a core hot-melt penetration layer.

[0017] The surface mechanical strength layer of the first layer is composed of a high melting point thermoplastic resin matrix, which mainly provides the mechanical strength characteristics of the entire composite membrane structure and plays a role in the overall structural continuity of the entire composite membrane and the operability of industrial production;

[0018] In the present application, the high melting point thermoplastic resin matrix refers to a resin matrix having a melting point above 200°C.

[0019] The second layer of the middle grid support layer adopts a hot-melt fiber mesh cloth structure, which provides mechanical support for the entire melt penetration process before the membrane composite matrix and the fiber fabric are hot-melted and penetrated, ensuring the integrity of the penetration path of the composite membrane penetration process;

[0020] The core hot-melt penetration layer of the third layer is composed of a low-melting-point and low-viscosity thermoplastic resin. During the entire melt penetration process of the composite film and the fiber-reinforced fabric, it can penetrate between the fiber fabric filaments due to its high fluidity, thus ensuring the interface bonding effect between the thermoplastic matrix and the fiber fabric.

[0021] Here, the low melting point and low viscosity thermoplastic resin refers to a resin having a melting point below 200°C.

[0022] The surface mechanical strength layer can be made of any one of high melting point polyester, polyoxymethylene, polyamide, polyphenylene ether, polyetheretherketone, polyphenylene sulfide, polyimide, polyetherimide and the like.

[0023] The surface mechanical strength layer film has a surface density of 5-20 g / m 2 The range can be adjusted arbitrarily according to design requirements.

[0024] The hot melt time of the surface mechanical strength layer is controlled within the range of 10-15s, the hot melt temperature is controlled within the range of 200-290°C, and can be designed according to the resin type. The hot melt pressure is controlled within the range of 1.5-3Kgf / m 2 .

[0025] The intermediate grid support layer can be made of hot-melt fiber fabric made of any material such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, etc., wherein the fiber fabric can be made of plain weave, twill weave, satin weave or unidirectional orthogonal laminated combination.

[0026] The surface density of the intermediate grid support layer is 5-10g / m 2 The range can be adjusted arbitrarily according to design requirements.

[0027] The hot melt time of the intermediate grid support layer is controlled within the range of 5-10s, the hot melt temperature is controlled within the range of 120-160°C, and can be designed according to the resin type. The hot melt pressure is controlled within the range of 1.5-3Kgf / m 2 .

[0028] The core hot-melt permeable layer film substrate can be made of any hot-melt resin film made of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, etc., and its surface density is 5-10g / m 2 The range can be adjusted arbitrarily according to design requirements.

[0029] The hot melt time of the core hot melt penetration layer is controlled within the range of 2-5s, the hot melt temperature is controlled within the range of 120-160°C, and can be designed according to the resin type. The hot melt pressure is controlled within the range of 1.5-3Kgf / m 2 .

[0030] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0031] Example 1

[0032] A specific laminated thermoplastic resin film-like matrix material is composed of three parts: a surface mechanical strength layer 1, an intermediate grid support layer 2, and a core hot melt permeable layer 3. It is made of high melting point polyester (DuPont LW9020FR, USA) with a surface density of 5g / m 2 The surface mechanical strength layer 1 provides the mechanical strength of the entire composite film. When the membrane substrate is hot-melted with the fiber fabric, the hot-melt time is adjusted to 10s, at a temperature of 200°C and a pressure of 1.5Kgf / m 2 The hot melt pressure completes the hot melt. The plain fabric made of polyethylene fiber is prepared with a surface density of 6g / m 2The intermediate grid support layer 2 provides mechanical support for the entire melt penetration process to ensure the integrity of the penetration path of the composite membrane penetration process. When the grid fabric is hot-melt composited with the fiber fabric, the hot-melt time is adjusted to 10s, at a temperature of 120°C and a pressure of 2Kgf / m 2 The hot melt pressure completes the hot melt. The low melting point and low viscosity polyethylene material is used with a surface density of 6g / m 2 The core hot-melt penetration layer 3 can penetrate between the fiber fabric monofilaments due to its high fluidity to ensure the interface bonding effect between the thermoplastic matrix and the fiber fabric. When the film-like matrix is ​​used for hot-melt composite with the fiber fabric, the hot-melt time is adjusted to 3s, at a temperature of 125°C and a pressure of 2.5Kgf / m 2 The hot melt pressure completes the hot melt.

[0033] Example 2

[0034] A specific laminated thermoplastic resin film-like matrix material is composed of three parts: a surface mechanical strength layer 1, an intermediate grid support layer 2 and a core hot-melt permeable layer 3. The high melting point polyoxymethylene is used to prepare the surface density of 7g / m 2 The surface mechanical strength layer 1 provides the mechanical strength of the entire composite film. When the membrane substrate is hot-melted with the fiber fabric, the hot-melt time is adjusted to 10s, at a temperature of 210°C and a pressure of 2Kgf / m 2 The hot melt pressure completes the hot melt. The 4-layer unidirectional orthogonal laminated fabric made of polypropylene fiber has a surface density of 7g / m 2 The intermediate grid support layer 2 provides mechanical support for the entire melt penetration process to ensure the integrity of the penetration path of the composite membrane penetration process. When the grid fabric is hot-melt composited with the fiber fabric, the hot-melt time is adjusted to 6s, at a temperature of 130°C and 3Kgf / m 2 The hot melt pressure completes the hot melt. The surface density of the low melting point and low viscosity polystyrene material is 6g / m 2 The core hot-melt penetration layer 3 can penetrate between the fiber fabric monofilaments due to its high fluidity to ensure the interface bonding effect between the thermoplastic matrix and the fiber fabric. When the film-like matrix is ​​used for hot-melt composite with the fiber fabric, the hot-melt time is adjusted to 4s, at a temperature of 150°C and a pressure of 3Kgf / m 2 The hot melt pressure completes the hot melt.

[0035] Example 3

[0036] A specific laminated thermoplastic resin film-like matrix material is composed of three parts: a surface mechanical strength layer 1, an intermediate grid support layer 2 and a core hot melt penetration layer 3. The high melting point polyamide is used to prepare the surface density of 20g / m 2The surface mechanical strength layer 1 provides the mechanical strength of the entire composite film. When the membrane substrate is hot-melted with the fiber fabric, the hot-melt time is adjusted to 15s, at a temperature of 260°C and a pressure of 3Kgf / m 2 The hot melt pressure completes the hot melt. The satin fabric made of polypropylene fiber is prepared with a surface density of 10g / m 2 The intermediate grid support layer 2 provides mechanical support for the entire melt penetration process to ensure the integrity of the penetration path of the composite membrane penetration process. When the grid fabric is hot-melt composited with the fiber fabric, the hot-melt time is adjusted to 8s. At a temperature of 150°C and a pressure of 2Kgf / m 2 The hot melt pressure completes the hot melt. The low melting point and low viscosity polypropylene material has a surface density of 8g / m 2 The core hot-melt penetration layer 3 can penetrate between the fiber fabric monofilaments due to its high fluidity to ensure the interface bonding effect between the thermoplastic matrix and the fiber fabric. When the film-like matrix is ​​used for hot-melt composite with the fiber fabric, the hot-melt time is adjusted to 4s, at a temperature of 140°C and a pressure of 3Kgf / m 2 The hot melt pressure completes the hot melt.

[0037] Example 4

[0038] A specific laminated thermoplastic resin film-like matrix material is composed of a surface mechanical strength layer 1, an intermediate grid support layer 2 and a core hot melt permeable layer 3, and is prepared using high melting point polyphenylene ether with a surface density of 18g / m 2 The surface mechanical strength layer 1 provides the mechanical strength of the entire composite film. When the membrane substrate is hot-melted with the fiber fabric, the hot-melt time is adjusted to 12s, at a temperature of 270°C and a pressure of 3Kgf / m 2 The hot melt pressure completes the hot melt. The twill fabric made of polyethylene fiber is prepared with a surface density of 6g / m 2 The intermediate grid support layer 2 provides mechanical support for the entire melt penetration process to ensure the integrity of the penetration path of the composite membrane penetration process. When the grid fabric is hot-melt composited with the fiber fabric, the hot-melt time is adjusted to 8s, at a temperature of 122°C and a pressure of 2Kgf / m 2 The hot melt pressure completes the hot melt. The surface density of the low melting point and low viscosity polyethylene material is 10g / m 2 The core hot-melt penetration layer 3 can penetrate between the fiber fabric monofilaments due to its high fluidity to ensure the interface bonding effect between the thermoplastic matrix and the fiber fabric. When the film-like matrix is ​​used for hot-melt composite with the fiber fabric, the hot-melt time is adjusted to 3s, at a temperature of 125°C and a pressure of 2.5Kgf / m 2 The hot melt pressure completes the hot melt.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to perform equivalent replacements on parts thereof. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. Although the above describes the specific implementation methods of the present invention, it is not intended to limit the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A thermoplastic composite film, characterized in that include: Surface mechanical strength layer, middle grid support layer and core hot-melt penetration layer; The surface mechanical strength layer, the middle grid support layer and the core hot-melt penetration layer are arranged in sequence from the outside to the inside, the surface mechanical strength layer is composed of a thermoplastic resin matrix, the middle grid support layer is composed of a hot-melt fiber mesh cloth, and the core hot-melt penetration layer is composed of a thermoplastic resin; The hot melt temperature of the surface mechanical strength layer is controlled within the range of 200-290°C; The hot melt temperature of the intermediate grid support layer is controlled within the range of 120-160°C; The hot melt temperature of the core hot melt permeable layer is controlled within the range of 120-160°C; The thermoplastic resin matrix is ​​any one of polyester, polyoxymethylene, polyamide, polyphenylene ether, polyetheretherketone, polyphenylene sulfide, polyimide, and polyetherimide; The intermediate grid support layer is made of hot-melt fiber fabric made of any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and polymethyl methacrylate; The core hot-melt permeable layer membrane substrate is made of a hot-melt resin film made of any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and polymethyl methacrylate.

2. The thermoplastic composite film according to claim 1, characterized in that The surface density of the surface mechanical strength layer film is 5-20 g / m 2 .

3. The thermoplastic composite film according to claim 1, characterized in that The hot-melt fiber fabric is made of plain weave, twill weave, satin weave or unidirectional orthogonal lamination.

4. The thermoplastic composite film according to claim 1, characterized in that The surface density of the intermediate grid support layer is 5-10g / m 2 .

5. The thermoplastic composite film according to claim 1, characterized in that The surface density of the core hot-melt permeable layer is 5-10 g / m 2 .

6. The thermoplastic composite film according to claim 1, characterized in that The surface mechanical strength layer is made of polyester, the middle grid support layer is made of plain fabric of polyethylene fiber, and the core hot-melt permeable layer is made of polyethylene.

7. The thermoplastic composite film according to claim 1, characterized in that The surface mechanical strength layer is made of polyoxymethylene, the middle grid support layer is made of 4 to 6 layers of unidirectional orthogonal laminated fabrics made of polypropylene fibers, and the core hot-melt permeable layer is made of polystyrene.

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