A method for continuously preparing a high-compression woven spacer fabric and a composite material thereof

Abstract

The present invention relates to a high-compression woven spacer fabric and a continuous preparation method of its composite material. The upper and lower layers of the high-compression woven spacer fabric include surface weft yarns, surface warp yarns and middle column yarns, and the spacer layer only includes middle column yarns; the middle column yarns include vertical pile warps and inclined pile warps, and the vertical pile warps are distributed on the left and right sides of the inclined pile warps; the vertical pile warps on both sides are in an "I" shape, and the inclined pile warps in the middle are in a "V" shape; the continuous preparation method of the high-compression integrated woven spacer fabric composite material is: first, the fabric is transported to an impregnation tank to be impregnated with resin, and then sent to a compression zone for extrusion, and dried and cured after the extrusion is completed. Before the fabric reaches the drying zone, the upper and lower layers that are adhered together are separated by a separation roller, so that the spacer yarns return to a standing state, and automatically trimmed after curing to obtain the composite material. The high-compression woven spacer fabric of the present invention has excellent resilience and shape retention, and the composite material obtained therefrom has excellent compressive performance.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and composite materials, and relates to a high-compression-resistant woven spacer fabric and a continuous preparation method of a composite material thereof. Background Art

[0002] As composite materials are increasingly used in aerospace, rail transit, construction and building materials, lightweight design and high-strength mechanical properties have become the development trend of composite materials. As a reinforcement, three-dimensional woven spacer fabric is not only lightweight but also has excellent compressive resistance compared to other fabric structures. However, in the industrial production process, the height of the spacer fabric directly affects the height of the finished composite material. At present, the spacer cross-section of woven spacer fabrics on the market is mostly "I"-shaped. After the surface layer of the fabric is compressed by external force, the "I"-shaped spacer wires are very likely to fall down simultaneously, in the same direction, and as a whole, which greatly reduces its compressive and impact resistance. At the same time, since the spacer wires cannot be restored to their original height, it is extremely difficult to control the dimensional accuracy of the finished product in the composite material molding process, which seriously affects its application. Therefore, it is necessary to produce a fabric with excellent resilience after compression, good shape retention, small damage to the height of the spacer wires, and excellent compressive resistance after being made into composite panels.

[0003] Patent CN109706584A discloses a compression-resistant woven spacer fabric and a weaving method thereof. This spacer fabric forms a triangular structure in the weft direction, and the triangle is surrounded by two pile warp yarns and two surface warp yarns sandwiched therein. The triangular structure improves the stability of the pile warp, but since this fabric uses the same number of ground warps to replace the original pile warps, the number of pile warps supporting the upper and lower layers is reduced exponentially. Therefore, the compression performance of the spacer composite material of this structure is significantly reduced compared to the traditional "I"-shaped spacer composite material.

[0004] Patent CN108221135A discloses a method for preparing a compression-resistant composite material. This method mainly uses the hand-layup method to apply the resin to the surface of the fabric with the help of a brush or roller, and then the resin spontaneously penetrates from the upper layer to the core layer to the lower layer under its own weight, and the intermediate spacer yarn and the resin adhere to each other to form a cross-linked network. However, this method has obvious defects: on the one hand, the hand-layup method will produce new bubbles during the brushing and coating process, which seriously affects the surface smoothness of the finished product. At the same time, it cannot guarantee that the resin can be filled in every gap in the surface layer, resulting in holes or gaps in the panel, which seriously affects the mechanical properties of the finished product; on the other hand, the staff needs to have skilled techniques and a faster speed to operate, otherwise the glue preparation time is too long, which can easily cause the colloid to heat up, the degree of coagulation will vary, and the density of the finished product will be uneven.

[0005] Patent CN108749039A discloses a high-performance fiber spacer fabric and resin composite device and method. The device mainly uses vacuum-assisted molding, uses a vacuum pump to evacuate the box to a vacuum state, and uses resin casting components and guide components to achieve resin infiltration of the fabric, reducing the generation and uneven distribution of bubbles between the resin and the spacer fabric. However, this method is not suitable for continuous production in the industry, the equipment occupies a large area and has a high cost; because the box is closed, the resin glue left in the guide groove and the injection pipe is not easy to clean, and the resin is easy to affect subsequent production after solidification, increasing the difficulty of operation.

[0006] Therefore, it is of great significance to study a high-compression woven spacer fabric and a method for continuously preparing a high-compression integrated woven spacer fabric composite material using the same. Summary of the invention

[0007] In order to solve the problems in the prior art, the present invention provides a method for continuously preparing a high-compression woven spacer fabric and a composite material thereof. The spacer layer of the woven spacer fabric is in an "IVI" shape, and the ratio of the "I" shape and the "V" shape can be designed according to the needs, including but not limited to "IVI", "IIVII", "IVVI", "IIVVII", etc. The high-compression woven spacer fabric provided by the present invention has excellent resilience and shape retention, the height of the spacer wire is less damaged after being compressed, the fabric has excellent resilience, and the composite material product obtained after composite molding has excellent compressive performance; at the same time, a method for continuously preparing a high-compression integrated woven spacer fabric composite material is provided, which can not only ensure the quality of the finished composite material, but also can be continuously produced.

[0008] To achieve the above object, the scheme adopted by the present invention is as follows:

[0009] A high-compression woven spacer fabric, which is a hollow multi-layer structure, is composed of an upper layer, a lower layer and a spacer layer, wherein the upper and lower layers contain surface layer weft yarns, surface layer warp yarns and middle column yarns, and the spacer layer contains only middle column yarns, which are connected and formed by repeatedly penetrating and interweaving the upper and lower layers;

[0010] The surface warp yarns and surface weft yarns are interwoven in the upper and lower planes respectively, and the middle column yarns are consolidated in a W shape with the surface weft yarns of the upper and lower layers;

[0011] The middle column yarn includes vertical pile warps and inclined pile warps, and the vertical pile warps are distributed on the left and right sides of the inclined pile warps; the vertical pile warps on both sides are in an "I" shape, and the inclined pile warps in the middle are in a "V" shape.

[0012] The traditional spacer fabric pile warp is in an "I" shape in the weft direction. The "I"-shaped pile warps are arranged in parallel in the weft direction. Every two parallel pile warps form a parallelogram with the upper and lower layers. When the upper layer is subjected to axial pressure, the parallelogram structure under the action of external force is very easy to deform, tilt and fall in the same direction, and the parallelogram structure cannot recover to its original height by itself after the external force is removed. The present invention starts with the shape structure of the pile warp in the weft direction, changes the traditional "I" shape into a "V" shape, and changes the parallelogram structure into a triangular structure, while retaining the traditional I-shaped spacer wire and placing it on both sides of the triangle. The stability of the triangular structure is better than that of the parallelogram structure. When the triangular structure is subjected to axial pressure, the pile warps that make up the triangle will buckle and bend in the axial direction. When the external force is removed, the triangular structure is not easy to deform and the fiber itself has a strong ability to recover from deformation. At the same time, the fabric designed by the present invention needs to be made into a composite material product for industrial application, and the strength of the composite material is equally important. If the fabric is all "V"-shaped in the weft direction, the decrease in the density of the weft pile warps will cause the strength of the composite material to decrease. Therefore, the present invention creatively combines the "I" and "V" shapes, which can not only meet the resilience and shape retention of the fabric from the fabric level, but also meet the required strength requirements from the composite material level.

[0013] As the preferred technical solution:

[0014] As described above, a high compression resistant woven spacer fabric, the spacer layer is in the shape of "IVI", "IIVII", "IVVI" or "IIVVII" in the weft direction (in each spacer layer cross section, the ratio of "V" shape to "I" shape in one fabric tissue cycle is 1:1, 1:2 or 1:4), and in the shape of "8" in the warp direction.

[0015] As described above, the high compression resistance woven spacer fabric, wherein the "I" shape comprises at least two vertical pile warps, and the "V" shape comprises at least eight inclined pile warps.

[0016] As described above, a high compression resistant woven spacer fabric comprises at least four surface warp yarns in the "V"-shaped upper gap, and at least two surface warp yarns on both sides of the "I"-shaped and "V"-shaped lower gaps.

[0017] A high compression resistant woven spacer fabric as described above, wherein the inclined pile warp is interwoven with the surface layer weft yarns in the warp direction in the weft direction section, and is arranged parallel to the surface layer warp yarns in the warp direction, and the inclined distance (the inclined distance is the horizontal distance between the upper layer inclined pile warp I / inclined pile warp III / inclined pile warp V / inclined pile warp VII and the lower layer inclined pile warp I / inclined pile warp III / inclined pile warp V / inclined pile warp VII) is the yarn width of the surface layer warp yarn;

[0018] The vertical pile warp is perpendicular to the surface weft yarn in the weft section, and the inclined distance is zero.

[0019] Specifically, the upper end of the inclined pile warp I is close to the vertical pile warp I on the left, and close to the inclined pile warp III on the right; the lower end of the inclined pile warp I is close to the lower layer warp II on the left, and close to the lower end of the inclined pile warp III on the right. Four continuous upper layer warp yarns I, upper layer warp yarn II, upper layer warp yarn III, and upper layer warp yarn IV are sandwiched between the inclined pile warp III and the inclined pile warp V, thereby forming a V-shaped upper spacing; the four continuous upper layer warp yarns correspond to the four continuous inclined pile warps of the lower layer, thereby forming a V-shaped lower tip.

[0020] In the high compression resistance woven spacer fabric as described above, the surface weft yarns, the surface warp yarns and the middle column yarns are independently selected from one or more combinations of glass fiber, quartz fiber, basalt fiber and carbon fiber.

[0021] The present invention also provides a continuous preparation method of a high-compression-resistant integrated woven spacer fabric composite material, firstly, the fabric is curled and fed forward by a fabric guide roller, and the fabric is transported from top to bottom to an impregnation tank through a tension roller, and the fabric is impregnated with resin in the impregnation tank, and is sent forward to a pressing area after being completely impregnated; first, a double pressing roller is used to remove excess resin glue on the surface, and then a second double pressing roller is used to perform secondary extrusion to expel bubbles between the fiber and the resin; after the extrusion is completed, the fabric is sent to a drying area through a guide roller; before the fabric reaches the drying area, the upper and lower layers that are adhered together are separated by a separation roller, so that the spacer yarns are restored to a standing state; the fabric enters an oven for drying and curing; after curing, the fabric is automatically trimmed according to the set size on a cutting table to obtain a high-compression-resistant integrated woven spacer fabric composite material;

[0022] The fabric is a high compression resistant woven spacer fabric as described above.

[0023] Compared with the prior art where the spacer fabric forming process mostly relies on hand lay-up forming or vacuum assisted forming, the continuous preparation method of the high-pressure-resistant integrated woven spacer fabric composite material of the present invention is special in the setting of the separation roller. After the fabric is impregnated with resin and extruded by the pressing roller, the upper and lower layers are adhered together. By setting the separation roller, the two separation rollers rotate relative to each other at different speeds, so as to stagger the upper and lower layers of the spacer fabric, restore the spacer layer, and make the spacer yarn stand up again.

[0024] As the preferred technical solution:

[0025] The continuous preparation method of the high-compression-resistant integrated woven spacer fabric composite material as described above, the performance indicators of the high-compression-resistant integrated woven spacer fabric composite material are as follows:

[0026] The height loss of the spacer yarn is 1.6-2%. The larger the proportion of "V" shape, the smaller the height loss of the spacer yarn, and the better the resilience and shape retention of the fabric. However, in the existing technology, that is, the traditional weft "I" shaped spacer fabric composite material, the height loss of the spacer yarn is as high as 15%.

[0027] The flat compression strength is 1.3-2.9 MPa. The greater the proportion of “I” shape, the greater the flat compression strength of the composite material.

[0028] The longitudinal lateral compressive strength is 2.7 to 4.3 MPa;

[0029] The latitudinal lateral pressure strength is 7.6-16 MPa;

[0030] The flat compression strength, warp lateral compression strength and weft lateral compression strength of the fabric composite material meet the requirements of the existing technical indicators. At the same time, the high-compression integrated woven spacer fabric composite material produced by the present invention achieves a lightweight structure while ensuring mechanical properties, which greatly reduces weight compared with the existing technology.

[0031] Beneficial Effects

[0032] (1) The high-compression woven spacer fabric of the present invention has excellent compression recovery after compression, and the height damage of the spacer yarn is only 1.6-2%, which can meet the height requirements of subsequent composite material product preparation without the need for secondary height repair; the surface density of the middle column yarn of the "IVI" shaped fabric is 13 yarns / cm 2 Compared with the existing technology, it can achieve a significant weight reduction (the surface density of the middle column yarn of the existing spacer fabric is 25 / cm 2 );

[0033] (2) The high-compression woven spacer fabric of the present invention achieves 37% weight reduction, and the flat compression strength, warp lateral compression strength and weft lateral compression strength of the fabric composite material meet the requirements of existing technical indicators. The proportion of "I" shape and "V" shape can be adjusted according to different strength requirements, and the designability is strong;

[0034] (3) The continuous preparation method of the high-compression-resistant integrated woven spacer fabric composite material of the present invention solves the problem of height loss of the finished product during the process of producing the spacer fabric composite material, making the height of the woven spacer fabric more controllable, and no secondary height repair processing is required for one-time molding from fabric to composite material; continuous preparation is achieved from fabric to composite material molding, greatly improving production efficiency; at the same time, the obtained spacer fabric composite material has better compression resistance, thereby improving the quality of the finished composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the high compression-resistant integrated woven spacer fabric of the present invention;

[0036] Figure 2 It is a schematic diagram of the interval cross section of the high compression resistance integrated woven spacer fabric of the present invention;

[0037] Figure 3 It is a schematic diagram of the continuous preparation process of the high-compression-resistant integrated woven spacer fabric composite material of the present invention;

[0038] Among them, 1- cloth guide roller, 2- tension roller, 3- soaking tank, 4- one squeeze roller, 5- two squeeze rollers, 6- guide roller, 7- separation roller, 8- oven, 9- cutting table, 10- upper layer, 20- lower layer, 30- spacer layer, 11- surface layer weft yarn, 12- surface layer warp yarn, 13- vertical pile warp, 14- inclined pile warp, 201- upper layer warp yarn I, 211- upper layer warp yarn II, 221- upper layer warp yarn III, 231- upper layer warp yarn IV, 202 - Bottom layer warp yarn Ⅰ, 212- bottom layer warp yarn Ⅱ, 222- bottom layer warp yarn Ⅲ, 232- bottom layer warp yarn Ⅳ, 301- vertical pile warp Ⅰ, 302- vertical pile warp Ⅱ, 303- vertical pile warp Ⅲ, 304- vertical pile warp Ⅳ, 311- inclined pile warp Ⅰ, 312- inclined pile warp Ⅱ, 321- inclined pile warp Ⅲ, 322- inclined pile warp Ⅳ, 331- inclined pile warp Ⅴ, 332- inclined pile warp Ⅵ, 341- inclined pile warp Ⅶ, 342- inclined pile warp Ⅷ. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0040] The testing method adopted by the present invention is as follows:

[0041] (1) Flat compression strength: tested according to GB / T1453-2022;

[0042] (2) Meridional lateral compressive strength: tested according to GB / T1454-2022;

[0043] (3) Lateral compressive strength: tested according to GB / T1454-2022.

[0044] Example 1

[0045] An "IVI" shaped high compression resistant woven spacer fabric, such as Figures 1-2As shown, it is a hollow multi-layer structure, which is composed of an upper layer 10, a lower layer 20 and a spacer layer 30; the upper and lower layers include surface layer weft yarns 11, surface layer warp yarns 12 and intermediate column yarns, and the spacer layer 30 only includes intermediate column yarns, which are connected and formed by repeatedly interweaving and interlacing the upper and lower layers; the surface layer warp yarns and the surface layer weft yarns are interlaced in the upper and lower planes respectively, and the intermediate column yarns are W-shapedly consolidated with the surface layer weft yarns of the upper and lower layers; the spacer layer 30 is in an "IVI" shape in the weft direction and an "8" shape in the warp direction; the intermediate column yarn includes vertical pile warps 13 and inclined pile warps 14, and the vertical pile warps 13 are distributed on the left and right sides of the inclined pile warps 14; the vertical pile warps on both sides are in an "I" shape, and the inclined pile warps in the middle are in a "V" shape;

[0046] The "I" shape includes four vertical pile warps, specifically vertical pile warp I 301, vertical pile warp II 302, vertical pile warp III 303, and vertical pile warp IV 304; the "V" shape includes eight inclined pile warps, specifically inclined pile warp I 311, inclined pile warp II 312, inclined pile warp III 321, inclined pile warp IV 322, inclined pile warp V 331, inclined pile warp VI 332, inclined pile warp VII 341, and inclined pile warp VIII 342;

[0047] The "V"-shaped upper gap contains four surface warp yarns, specifically upper warp yarn I201, upper warp yarn II211, upper warp yarn III221, and upper warp yarn IV231; the "I"-shaped and "V"-shaped lower gaps contain two surface warp yarns on both sides, specifically lower warp yarn I202, lower warp yarn II212, lower warp yarn III222, and lower warp yarn IV232;

[0048] The inclined pile warp 14 is interwoven with the surface layer weft yarn 11 in the warp direction in the weft section, and is arranged parallel to the surface layer warp yarn 12 in the warp direction. The inclined distance (the inclined distance is the horizontal distance between the upper layer inclined pile warp Ⅰ311 / inclined pile warp Ⅲ321 / inclined pile warp Ⅴ331 / inclined pile warp Ⅶ341 and the corresponding lower layer inclined pile warp Ⅰ311 / inclined pile warp Ⅲ321 / inclined pile warp Ⅴ331 / inclined pile warp Ⅶ341) is the sum of the yarn widths of one surface layer warp yarn (width 1 cm) and two middle column yarns (each middle column yarn has a width of 0.45 cm) contained in the horizontal distance, and the value is 1.9 cm;

[0049] The vertical pile warp 13 is perpendicular to the surface layer weft yarn 11 in the weft section, and the inclined distance is zero. Specifically, the upper end of the inclined pile warp Ⅰ311 is close to the vertical pile warp Ⅰ301 on the left, and close to the inclined pile warp Ⅲ321 on the right; the lower end of the inclined pile warp Ⅰ311 is close to the lower layer warp yarn Ⅱ212 on the left, and close to the lower end of the inclined pile warp Ⅲ321 on the right; four continuous upper layer warp yarns Ⅰ201, upper layer warp yarns Ⅱ211, upper layer warp yarns Ⅲ221, and upper layer warp yarns Ⅳ231 are clamped between the inclined pile warp Ⅲ321 and the inclined pile warp Ⅴ331, thereby forming a V-shaped upper spacing; the four continuous upper layer warp yarns correspond to the four continuous inclined pile warps of the lower layer, thereby forming a V-shaped lower tip.

[0050] The weaving method of the fabric is as follows: selecting E-type glass fiber with a linear density of 150 tex as the surface weft yarn 11 and the surface warp yarn 12, and selecting E-type glass fiber with a linear density of 75 tex as the intermediate column yarn, using a double rapier loom with a multi-shed beating mechanism, using a multi-heald eye heald with multiple groups of heald frames to lift the heald up and down, and inserting a 5 mm spacer rod at the shed to weave a spacing height of 5 mm and a surface density of 13 strands / cm 2 "IVI" shaped woven spacer fabric.

[0051] Example 2

[0052] A "IIVII" shaped high compression resistant woven spacer fabric has a structure basically the same as that of Example 1, except that two vertical pile warps and two surface warp yarns are added on both sides of vertical pile warp I301, vertical pile warp II302, vertical pile warp III303, and vertical pile warp IV304.

[0053] The weaving method of the fabric is as follows: selecting E-type glass fiber with a linear density of 150 tex as the surface weft yarn 11 and the surface warp yarn 12, and selecting E-type glass fiber with a linear density of 75 tex as the intermediate column yarn, using a double rapier loom with a multi-shed beating mechanism, using a multi-heald eye heald with multiple groups of heald frames to lift the heald up and down, and inserting a 5 mm spacer rod at the shed to weave a spacing height of 5 mm and a surface density of 17 strands / cm 2 "IIVII" shaped woven spacer fabric.

[0054] Example 3

[0055] A continuous preparation method of a high-compression integrated woven spacer fabric composite material, the specific steps are as follows Figure 3 As shown:

[0056] (1) First, the fabric is rolled forward by the fabric guide roller 1, and the fabric is transported from top to bottom to the impregnation tank 3 through the tension roller 2. E-51 epoxy resin and matching curing agent are mixed in a mass ratio of 100:28 and poured into the impregnation tank 3. After stirring at a low speed of 300 r / min until the prepared liquid is evenly mixed, the fabric is impregnated with the resin in the impregnation tank 3, and after being completely impregnated, it is sent forward to the squeezing area;

[0057] Wherein, the fabric is the high compression resistant woven spacer fabric of Example 1;

[0058] (2) The fabric completely impregnated with resin is first passed through a double squeeze roller 4 (working pressure of 1 kN / cm, roller speed of 1.75 m / s) to gently press and slowly remove excess resin glue on the surface, and then a second double squeeze roller 5 (working pressure of 3 kN / cm, roller speed of 3.15 m / s) performs secondary high-pressure rapid extrusion to expel bubbles between the fiber and the resin;

[0059] (3) After extrusion is completed, the fabric is sent to the drying area through the guide roller 6; before reaching the drying area, the upper and lower layers of the fabric are separated by the separation roller 7, so that the spacer yarns can resume the standing state; the fabric enters the oven 8 for drying and curing (heating temperature 120°C, fan system running speed 10m / min, total curing time 5h); after curing, it is automatically trimmed according to the set size on the cutting table 9 to obtain a high-compression-resistant integrated woven spacer fabric composite material;

[0060] Among them, the upper and lower rollers of the separation roller turn in opposite directions, with rotation speeds of 1.25m / s and 1.5m / s respectively; the upper roller conveys the fabric forward to drive the upper layer forward, and the lower roller carries the lower layer backward. The relative movement of the upper and lower rollers separates and staggers the upper and lower layers, and the spacer yarn gets rid of the resin adhesion and resumes the standing state.

[0061] After testing, the prepared high-compression integrated woven spacer fabric composite material had a spacer yarn height loss of 2%, a flat compression strength of 1.3 MPa, a warp lateral compression strength of 2.7 MPa, and a weft lateral compression strength of 7.6 MPa.

[0062] Example 4

[0063] A continuous preparation method of a high-compression-resistant integrated woven spacer fabric composite material, the specific steps are as follows:

[0064] (1) First, the fabric is rolled forward by the fabric guide roller 1, and the fabric is transported from top to bottom to the impregnation tank 3 through the tension roller 2. R701 bisphenol E cyanate resin is selected, and the fabric and cyanate are mixed in a mass ratio of 1:1.5 and poured into the impregnation tank 3. After the preparation liquid is evenly mixed by stirring at a low speed of 500 r / min, the fabric is impregnated with the resin in the impregnation tank 3, and after being completely impregnated, the fabric is sent forward to the pressing area;

[0065] Wherein, the fabric is the high compression resistant woven spacer fabric of Example 2;

[0066] (2) The fabric completely impregnated with resin is first passed through a double squeeze roller 4 (working pressure of 1 kN / cm, roller speed of 1.75 m / s) to gently press and slowly remove excess resin glue on the surface, and then a second double squeeze roller 5 (working pressure of 3 kN / cm, roller speed of 3.15 m / s) performs secondary high-pressure rapid extrusion to expel bubbles between the fiber and the resin;

[0067] (3) After extrusion is completed, the fabric is sent to the drying area through the guide roller 6; before reaching the drying area, the upper and lower layers of the fabric are separated by the separation roller 7, so that the spacer yarns can resume the standing state; the fabric enters the oven 8 for drying and curing (heating at 150° C. for 1 hour and then at 180° C. for 3 hours, with the fan system running at a speed of 10 m / min); after curing, the fabric is automatically trimmed according to the set size on the cutting table 9 to obtain a high-compression-resistant integrated woven spacer fabric composite material;

[0068] Among them, the upper and lower rollers of the separation roller turn in opposite directions, with rotation speeds of 1.25m / s and 1.5m / s respectively; the upper roller conveys the fabric forward to drive the upper layer forward, and the lower roller carries the lower layer backward. The relative movement of the upper and lower rollers separates and staggers the upper and lower layers, and the spacer yarn gets rid of the resin adhesion and resumes the standing state.

[0069] According to tests, the prepared high-compression integrated woven spacer fabric composite material has a spacer yarn height loss of 1.8%, a flat compression strength of 2.1 MPa, a warp lateral compression strength of 4.3 MPa, and a weft lateral compression strength of 16 MPa.

Claims

1. A high compression resistant woven spacer fabric, which is a hollow multi-layer structure, consisting of an upper layer, a lower layer and a spacer layer, characterized in that: The upper and lower layers include surface weft yarns, surface warp yarns and middle column yarns, and the spacer layer only includes middle column yarns, which are connected and formed by repeatedly penetrating and interweaving the upper and lower layers; The surface warp yarns and surface weft yarns are interwoven in the upper and lower planes respectively, and the middle column yarns are consolidated in a W shape with the surface weft yarns of the upper and lower layers; The middle column yarn includes vertical pile warps and inclined pile warps, and the vertical pile warps are distributed on the left and right sides of the inclined pile warps; the vertical pile warps on both sides are in an "I" shape, and the inclined pile warps in the middle are in a "V" shape; The spacer layer is in the shape of "IVI", "IIVII", "IVVI" or "IIVVII" in the weft direction and in the shape of "8" in the warp direction; The "I" shape contains at least two vertical pile warps, and the "V" shape contains at least eight inclined pile warps; The "V"-shaped upper gap contains at least four surface warp yarns, and the "I"-shaped and "V"-shaped lower gaps contain at least two surface warp yarns on both sides.

2. A high compression resistance woven spacer fabric according to claim 1, characterized in that: The inclined pile warp is interwoven with the surface layer weft yarn along the warp direction in the weft section, and is arranged parallel to the surface layer warp yarn along the warp direction, and the inclined distance is the yarn width of the surface layer warp yarn; The vertical pile warp is perpendicular to the surface weft yarn in the weft section, and the inclined distance is zero.

3. A high compression resistance woven spacer fabric according to claim 1, characterized in that: The surface layer weft yarns, the surface layer warp yarns and the middle column yarns are each independently selected from one or more combinations of glass fibers, quartz fibers, basalt fibers and carbon fibers.

4. A continuous preparation method of a high-compression-resistant integrated woven spacer fabric composite material, characterized in that: First, the fabric is rolled forward by the guide roller and transported to the impregnation tank from top to bottom through the tension roller. The fabric is impregnated with resin in the impregnation tank and is sent forward to the squeezing area after being fully impregnated. The fabric is firstly removed from the surface by a double squeezing roller, and then the second double squeezing roller performs secondary squeezing to remove the bubbles between the fiber and the resin. After the squeezing is completed, the fabric is sent to the drying area through the guide roller. Before the fabric reaches the drying area, the upper and lower layers that are stuck together are separated by a separation roller, so that the spacer yarns can resume the standing state; the fabric enters the oven for drying and curing; after curing, it is automatically trimmed according to the set size on the cutting table to obtain a high-pressure-resistant integrated woven spacer fabric composite material; The fabric is a high compression resistant woven spacer fabric as claimed in any one of claims 1 to 3.

5. The continuous preparation method of a high-compression-resistant integrated woven spacer fabric composite material according to claim 4, characterized in that: The performance indicators of the high compression-resistant integrated woven spacer fabric composite material are as follows: The height loss of the spacer wire is 1.6-2%; Flat compressive strength 1.3~2.9 MPa; The longitudinal lateral compressive strength is 2.7 to 4.3 MPa; The latitudinal lateral pressure strength is 7.6 to 16 MPa.

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