Compression-resistant and impact-resistant composite felt board as well as preparation method and application thereof

Abstract

The invention discloses a compression-resistant and impact-resistant composite felt board as well as a preparation method and application thereof. The compression-resistant and impact-resistant composite felt board comprises a surface layer and a core layer, the surface layer and the core layer are combined into a whole through a silane coupling agent modified interface; the surface layer is made of non-woven fabric; and the core layer is a chopped fiber composite felt and is formed by compounding chopped fibers and a resin matrix. Through the non-woven fabric-chopped fiber composite felt-non-woven fabric sandwich structure design and the hot press molding process, the compression-resistant and impact-resistant composite felt board is successfully prepared, and the obtained composite felt board is high in compression strength, good in air permeability and light in weight and has wide application prospects in the field of sports protective articles.

Description

Technical Field

[0001] The present invention relates to the field of composite materials, in particular to a compression-resistant and impact-resistant composite felt board and a preparation method and application thereof. Background Art

[0002] In recent years, as people's health awareness has gradually improved, the market for sports safety products has become increasingly active, and helmets are one of them.

[0003] The inner layer of a helmet typically includes a layer of material designed to enhance wearing comfort. Existing materials typically use layers of foam resin or chopped fiber mats, which suffer from poor air permeability, low compressive strength, and inadequate head cushioning and protection, impacting both safety and comfort. Summary of the Invention

[0004] The present invention can solve the above-mentioned deficiencies of existing products by providing a compression-resistant and impact-resistant composite felt board and a preparation method and application thereof.

[0005] In order to solve the above technical problems, the present invention provides a compression and impact resistant composite felt board, comprising: a surface layer and a core layer; the surface layer and the core layer are integrated by modifying the interface with a silane coupling agent; wherein,

[0006] The surface layer is non-woven fabric;

[0007] The core layer is a chopped fiber composite felt, which is formed by compounding chopped fibers and a resin matrix.

[0008] In a preferred embodiment of the present invention, the thickness of the core layer is 1 / 2 to 1 / 4 of the thickness of the composite felt board.

[0009] In a preferred embodiment of the present invention, the fiber type of the non-woven fabric is polyester fiber, glass fiber or degradable PLA fiber.

[0010] In a preferred embodiment of the present invention, the length of the chopped fibers is 6-15 mm, and the volume fraction of the chopped fibers in the chopped fiber composite mat is 20-40%.

[0011] In a preferred embodiment of the present invention, the chopped fibers are at least one of carbon fibers, aramid fibers, or basalt fibers.

[0012] In order to solve the above technical problems, the present invention also provides a method for preparing a compression-resistant and impact-resistant composite felt board, comprising the following steps:

[0013] (1) Pretreatment: impregnating the chopped fiber composite felt with a silane coupling agent solution;

[0014] (2) Layered laying: Lay the non-woven fabric-chopped fiber composite mat-non-woven fabric from bottom to top to form a sandwich structure;

[0015] (3) Hot pressing: The sandwich structure laid out in step (2) is placed in a flat press for hot pressing, and after being taken out and cooled, the composite felt board is obtained.

[0016] In a preferred embodiment of the present invention, in step (1), the silane coupling agent is KH-550, and the volume concentration is 1-3%.

[0017] In a preferred embodiment of the present invention, in step (1), the impregnation time is 5-15 minutes, and the weight gain of the chopped fiber composite felt after impregnation is 10-30%.

[0018] In a preferred embodiment of the present invention, in step (3), the process conditions of the hot pressing molding are: temperature 160-180°C, pressure 5-15 MPa, and holding pressure for 10-30 minutes.

[0019] In order to solve the above technical problems, the present invention also provides an application of a compression-resistant and impact-resistant composite felt board for sports protective equipment.

[0020] The beneficial effects of the present invention are: a compression-resistant and impact-resistant composite felt board and its preparation method and application of the present invention, through the "non-woven fabric-chopped fiber composite felt-non-woven fabric" sandwich structure design and hot pressing molding process, a compression-resistant and impact-resistant composite felt board is successfully prepared. The obtained composite felt board has high compressive strength, good air permeability, and light weight, and has broad application prospects in the field of sports protective equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of a preferred embodiment of a compression-resistant and impact-resistant composite felt board of the present invention;

[0022] The components in the drawings are marked as follows: 10. Surface layer, 20. Core layer. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0024] Chopped fiber composite mat is made of chopped fibers and resin matrix through impregnation and curing process.

[0025] Example 1

[0026] The invention discloses a compression-resistant and impact-resistant composite felt board, which is used for sports protective equipment, such as being used as an inner protective layer of a safety helmet after being cut.

[0027] Specifically, if Figure 1 As shown, the compression-resistant and impact-resistant composite felt board includes: a surface layer 10 and a core layer 20; the core layer 20 is sandwiched in the middle of the surface layer 10 to form a sandwich structure.

[0028] The surface layer 10 is a non-woven fabric, specifically a polyester fiber non-woven fabric, which provides uniform support and reduces surface defects of the felt board.

[0029] The core layer 20 is a chopped fiber composite mat, which is composed of chopped aramid fibers with a length of 10 mm and epoxy resin, wherein the volume fraction of the chopped aramid fibers is 30%.

[0030] The thickness of the core layer 20 is 1 / 3 of the overall thickness of the composite felt board, which serves to increase the strength and the ability to resist compression deformation.

[0031] The composite felt board of the present invention achieves both lightweight and compressive performance by adopting a layered structure design of a sandwich structure with non-woven fabric as the surface layer and short-cut fiber composite felt as the core layer.

[0032] The preparation method of the above-mentioned compression-resistant and impact-resistant composite felt board comprises the following specific steps:

[0033] (1) Pretreatment: The chopped fiber composite felt is immersed in a silane coupling agent KH-550 solution with a volume concentration of 2%, and the immersion time is controlled to be 8 minutes, so that the weight gain of the chopped fiber composite felt after immersion is 20%.

[0034] (2) Layered laying: Take out the impregnated chopped fiber composite felt and lay it from bottom to top in the order of non-woven fabric-chopped fiber composite felt-non-woven fabric to form a sandwich structure.

[0035] (3) Hot pressing: The sandwich structure prepared in step (2) is placed in a flat press, and hot pressed for 15 minutes at a temperature of 165° C. and a pressure of 10 MPa. After being taken out and cooled, the composite felt board is obtained.

[0036] Example 2

[0037] The invention discloses a compression-resistant and impact-resistant composite felt board, which is used for sports protective equipment, such as being used as an inner protective layer of a safety helmet after being cut.

[0038] Specifically, if Figure 1 As shown, the compression-resistant and impact-resistant composite felt board includes: a surface layer 10 and a core layer 20; the core layer 20 is sandwiched in the middle of the surface layer 10 to form a sandwich structure.

[0039] The surface layer 10 is a non-woven fabric, specifically a degradable PLA fiber non-woven fabric, which provides uniform support and reduces surface defects of the felt board.

[0040] The core layer 20 is a chopped fiber composite mat, which is made of chopped carbon fibers with a length of 10 mm and epoxy resin, wherein the volume fraction of the carbon fibers is 25%.

[0041] The thickness of the core layer 20 is 1 / 2 of the overall thickness of the composite felt board, which serves to increase the strength and the ability to resist compression deformation.

[0042] The composite felt board of the present invention achieves both lightweight and compressive performance by adopting a layered structure design of a sandwich structure with non-woven fabric as the surface layer and short-cut fiber composite felt as the core layer.

[0043] The preparation method of the above-mentioned compression-resistant and impact-resistant composite felt board comprises the following specific steps:

[0044] (1) Pretreatment: The chopped fiber composite felt is immersed in a silane coupling agent KH-550 solution with a volume concentration of 2%, and the immersion time is controlled to be 10 minutes, so that the weight increase of the chopped fiber composite felt after immersion is not higher than 25%.

[0045] (2) Layered laying: Take out the impregnated chopped fiber composite felt and lay it from bottom to top in the order of non-woven fabric-chopped fiber composite felt-non-woven fabric to form a sandwich structure.

[0046] (3) Hot pressing: The sandwich structure prepared in step (2) is placed in a flat press, and hot pressed for 12 minutes at a temperature of 170° C. and a pressure of 8 MPa. After being taken out and cooled, the composite felt board is obtained.

[0047] The density, compressive strength, air permeability and sound insulation performance of the composite felt boards prepared in Example 1 and Example 2 were tested.

[0048] Among them, the compressive strength test is based on the test standard of ASTM D695; the air permeability test is carried out according to the test standard of ISO 9237; and the sound insulation coefficient is tested according to the ASTM E1050 standard.

[0049] The test results are shown in Table 1 below.

[0050] Table 1

[0051]

[0052] It can be seen from the test data in Table 1 that the composite felt board prepared by the present invention has low density, light weight, and high compressive strength, that is, it has the excellent performance of light weight and high strength, and at the same time has excellent air permeability. It is an ideal material for making sports protective equipment, especially suitable for use as an inner protective material for helmets.

[0053] The present invention successfully prepares a compression- and impact-resistant composite felt board through a "non-woven fabric-chopped fiber composite felt-non-woven fabric" sandwich structure design, combined with silane coupling agent interface modification and hot pressing molding process. After a large number of tests, the composite felt board has high compressive strength between 220-280MPa and good air permeability, with an air permeability of 30-60cm 3 / (cm 2 ·s), light weight, density is 1.3-1.6g / cm 3 That is, the material combines light weight, high strength and high breathability, and the material cost is low, which has broad application prospects in the field of sports protective equipment.

[0054] In addition, the composite felt board prepared by the present invention can also be used in the fields of construction, transportation, etc. as a high-strength sound insulation material.

[0055] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A compression-resistant and impact-resistant composite felt board, characterized in that: include: Surface layer and core layer; the surface layer and core layer are integrated into one by modifying the interface with a silane coupling agent; wherein, The surface layer is non-woven fabric; The core layer is a chopped fiber composite felt, which is formed by compounding chopped fibers and a resin matrix.

2. The compression-resistant and impact-resistant composite felt board according to claim 1, characterized in that: The thickness of the core layer is 1 / 2 to 1 / 4 of the thickness of the composite felt board.

3. The compression-resistant and impact-resistant composite felt board according to claim 1, characterized in that: The fiber type of the non-woven fabric is polyester fiber, glass fiber or degradable PLA fiber.

4. The compression-resistant and impact-resistant composite felt board according to claim 1, characterized in that: The length of the chopped fibers is 6-15 mm, and the volume fraction of the chopped fibers in the chopped fiber composite mat is 20-40%.

5. The compression-resistant and impact-resistant composite felt board according to claim 4, characterized in that: The chopped fibers are at least one of carbon fibers, aramid fibers, and basalt fibers.

6. A method for preparing a compression-resistant and impact-resistant composite felt board according to any one of claims 1 to 5, characterized in that: The steps include: (1) Pretreatment: impregnating the chopped fiber composite felt with a silane coupling agent solution; (2) Layered laying: Lay the non-woven fabric-chopped fiber composite mat-non-woven fabric from bottom to top to form a sandwich structure; (3) Hot pressing: The sandwich structure laid out in step (2) is placed in a flat press for hot pressing, and after being taken out and cooled, the composite felt board is obtained.

7. The method for preparing a compression-resistant and impact-resistant composite felt board according to claim 6, characterized in that: In step (1), the silane coupling agent is KH-550, and the volume concentration is 1-3%.

8. The method for preparing a compression-resistant and impact-resistant composite felt board according to claim 6, characterized in that: In step (1), the impregnation time is 5-15 minutes, and the weight gain of the chopped fiber composite felt after impregnation is 10-30%.

9. The method for preparing a compression-resistant and impact-resistant composite felt board according to claim 6, characterized in that: In step (3), the process conditions of the hot pressing molding are: temperature 160-180°C, pressure 5-15 MPa, and pressure holding for 10-30 minutes.

10. An application of the compression-resistant and impact-resistant composite felt board according to any one of claims 1 to 5, characterized in that: For sports protective equipment.

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