A method for preventing static electricity of basalt composite fiber needle-punched felt and application thereof

Abstract

The present application belongs to the technical field of composite material recycling and reusing, and relates to a method for preventing static electricity of basalt composite fiber needle-punched felt and application. The recycling method comprises the following steps: anti-static treatment of waste core layer, reduction of frictional electrification by using anti-static agent; and then, crushing, conveying, stacking, neutralization of static electricity charge and needle roller opening, to obtain basalt composite fiber needle-punched waste. The needle-punched fiber waste after re-carding is directly used as the core layer of the composite board, and the basalt fiber cloth pre-impregnated layer formed by laying the pre-impregnated material on both sides, is subjected to gradient temperature hot pressing and solidification, to obtain a sandwich structure composite board. The anti-static agent and ion wind discharge system are introduced in the waste conveying and crushing process, to avoid static electricity accumulation and fire risk. Through the anti-static, crushing, charge neutralization and needle roller opening process, the needle-punched waste can be re-formed into a uniform core layer. The mechanical and heat insulation performance of the board, the bending strength, impact toughness and long-term service stability of the composite board are significantly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of composite material recycling and reuse, and particularly relates to a method for preventing static electricity in recycling of basalt composite fiber needle-punched felt, and application of the recycled basalt fiber needle-punched felt to preparation of a core layer of a composite board. BACKGROUND

[0002] Basalt fiber is a green inorganic fiber with high strength, heat resistance and chemical stability, and has been widely used in the fields of automobiles, rail transit and buildings. After polypropylene (PP) and other thermoplastic fibers are needle-punched with basalt fibers to form a felt, a light composite board can be prepared by hot pressing. However, a large amount of offcut and waste needle-punched fiber felt is generated in the process, which is difficult to recycle and utilize due to uneven fiber length, rough surface and easy accumulation of static electricity in the conveying and crushing process.

[0003] The existing technology generally uses measures such as spraying antistatic agents, grounding or ion wind to alleviate static electricity, but the above measures are mostly limited to the safety protection level and are not effectively combined with the subsequent recycling process. At the same time, the waste material usually needs to go through the steps of crushing, granulation and reshaping, which is a complex process with high energy consumption, and the mechanical properties of the obtained material also decrease significantly due to poor secondary melt flowability. In addition, the core layer of the existing "sandwich" structure composite board mainly uses foam, honeycomb or virgin fiber products, and has not yet used recycled needle-punched waste as a core layer material.

[0004] Therefore, how to solve the problems of static electricity hazard and uneven dispersion of waste materials in the recycling process, and efficiently utilize the needle-punched waste as a core layer of a composite board, is a technical problem to be solved at present. SUMMARY

[0005] The purpose of the present application is to provide a method for preventing static electricity in recycling of basalt composite fiber needle-punched felt and application of the recycled basalt composite fiber needle-punched felt in preparation of a core layer of a "sandwich" structure composite board, so as to solve the problems of static electricity and agglomeration in the recycling process of waste needle-punched fiber felt and realize high-value utilization of waste materials.

[0006] The present application is realized by the following technical solutions:

[0007] A method for preventing static electricity in recycling of basalt composite fiber needle-punched felt, comprising the following steps:

[0008] Step 1: using a spray type antistatic agent to perform antistatic pretreatment on the basalt composite fiber needle-punched waste, and the spray addition amount is 0.05-0.2wt%;

[0009] Step 2, the anti-static pre-processed waste material in step 1 is subjected to mechanical cutting and crushing treatment, and then is transported to a stock bin. An ion wind discharge system and a grounding system are arranged in the crushing area to neutralize static electricity. The charge neutralization is realized through the grounding system. A discharge electrode plate is arranged at the outlet of the stock bin to release residual charge.

[0010] Step 3, the waste material treated in step 2 is sent to a fiber carding device. The waste material is re-carded through needle roller opening and laying. Airflow assisted laying and charge neutralization are realized through the ion wind discharge system arranged above the laying mechanism, so that the waste material is uniformly dispersed into a thin layer with uniform thickness. The single layer thickness is controlled to be 2.0-3.0 mm, and multiple layers can be stacked to form a target core layer thickness.

[0011] Further, in step 1, the spray type antistatic agent is a quaternary ammonium salt type, a phosphate type or a polyether type antistatic agent.

[0012] Further, in step 1, the fibers in the basalt composite fiber needle-punched waste material include basalt fibers and thermoplastic fibers, and the thermoplastic fibers are polypropylene fibers, polyethylene fibers or a mixture of the two.

[0013] Further, in step 2, the crushing treatment is performed by a shearing type fiber crusher, so that the needle-punched fiber base material is divided into short fiber fragments with a length of about 10-30 mm.

[0014] Further, in step 2, the ion wind discharge system is composed of a high-voltage generator, an ion wind nozzle and a discharge electrode plate. The ion wind discharge system is respectively installed at the discharge port of the shearing type fiber crusher, above the conveying belt and at the position of the stock bin outlet. The ion wind nozzle is arranged at the discharge port of the shearing type fiber crusher, which can neutralize the friction charge generated by the fiber during high-speed shearing.

[0015] Further, in step 2, the grounding system includes a conductive grounding wire, a conductive support, a conductive conveying belt or a stock bin bottom plate, which is arranged throughout the shearing type crusher, the conveying system and the laying mechanism frame, and is used to timely guide the neutralized residual charge into the grounding net to realize potential balance.

[0016] Further, the conveying system adopts a negative pressure conveying system. One end of the conveying pipeline is connected with the outlet of the shearing type crusher, and the other end is connected with the inlet of the stock bin. The inner wall of the pipeline is grounded as a whole, and ion wind nozzles are arranged at key nodes of the pipeline to continuously neutralize static electricity generated by flow.

[0017] The application relates to a method for recycling basalt composite fiber needle-punched felt, and application of the basalt fiber needle-punched felt prepared by the method.

[0018] Further, the sandwich structure composite board is obtained by cooling after 100 DEG C hot pressing for 2h under the pressure of 2-4 MPa, then 135 DEG C hot pressing for 3h, and then 175 DEG C hot pressing for 1h.

[0019] Further, the prepreg of the basalt fiber cloth is one of epoxy resin, phenolic resin or unsaturated polyester resin, and the mass ratio of the prepreg to the basalt fiber cloth is 1:2-1:3.

[0020] Compared with the prior art, the application has the following beneficial effects:

[0021] 1. The anti-static agent and ion wind discharge system are introduced in the waste conveying and crushing process, so that the static electricity accumulation and fire risk are avoided, and the safety of industrialized recycling is ensured.

[0022] 2. The uneven distribution problem of the waste is solved through the combined process of anti-static, crushing, charge neutralization and needle roller opening, so that the needle-punched waste can form a uniform core layer again, and the forming quality of the subsequent board is fundamentally improved.

[0023] 3. The waste is directly used as the core layer, and the regeneration method of melting and granulating is no longer needed, so that the energy consumption can be effectively reduced, and the performance deterioration caused by secondary melting is avoided.

[0024] 4. The synergistic effect of the outer layer of high-strength basalt cloth and the inner layer of flexible and ductile core material is realized through the "sandwich" structure design, and the mechanical and heat insulation properties of the board are significantly improved, and the prepared material is suitable for the fields of automobile interior and exterior decoration and rail transit board.

[0025] 5. The multi-stage curing process of the application makes the thermoplastic polypropylene of the core layer and the outer layer of thermosetting resin exhibit synergistic effect at different temperatures: the surface chain segment of polypropylene is enhanced at 100 DEG C, which is beneficial to the preliminary embedding with the resin; the fiber surface layer is locally softened and penetrates into the resin at 135 DEG C, enhancing the physical interlocking effect; the polypropylene is completely melted and crosslinked with the resin network at 175 DEG C, forming a composite interface structure of resin wrapping and polypropylene penetration; the process not only realizes the strong core layer-surface layer bonding force, but also effectively relieves the curing stress, thereby significantly improving the bending strength, impact toughness and long-term service stability of the composite board.

[0026] 6、The basalt fiber composite needle felt recycling method of the present application does not need desizing treatment, and is directly recycled, environmentally friendly and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0028] Figure 1 Process flow chart of the basalt composite fiber needle felt anti-static recycling method of the present application;

[0029] Figure 2 The sandwich structure schematic diagram of the fiber cloth-waste core layer-fiber cloth of the present application;

[0030] Figure 3 Influence curve of different thermoplastic fiber types on thermal conductivity, bending strength and impact strength;

[0031] Figure 4 Influence curve of different antistatic agent types on thermal conductivity, bending strength and impact strength;

[0032] Figure 5 Influence curve of different antistatic agent spray amounts on thermal conductivity, bending strength and impact strength;

[0033] Figure 6 Influence curve of different waste volume fractions on thermal conductivity, bending strength and impact strength;

[0034] Figure 7 Influence curve of different prepreg resin types on thermal conductivity, bending strength and impact strength;

[0035] Figure 8 Influence curve of different prepreg and fiber cloth mass ratios on thermal conductivity, bending strength and impact strength;

[0036] Figure 9 Influence curve of different holding pressures on thermal conductivity, bending strength and impact strength;

[0037] Figure 10 Influence curve of different single-layer waste thicknesses on thermal conductivity, bending strength and impact strength. DETAILED DESCRIPTION

[0038] The present application will be further described below in combination with embodiments:

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0040] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] like Figure 1 As shown, the antistatic recycling method for basalt composite fiber needle-punched felt of the present invention includes antistatic pretreatment of the waste core layer, i.e., basalt composite fiber needle-punched waste, by using a spray-type antistatic agent to reduce frictional charging. Then, it undergoes sequential crushing, conveying, and stacking, static charge neutralization, and needle roller loosening to obtain basalt composite fiber needle-punched waste. In this invention, an ion wind discharge system is set up in the two key stages of crushing and web laying to release positive and negative ions to neutralize the static electricity generated by the fibers during mechanical processing. Specifically, the ion wind discharge system is arranged above the discharge port of the shear crusher and the web laying mechanism to neutralize the charge in a timely manner when fiber fragments leave the shear zone and during the web laying stage, preventing fiber agglomeration and scattering, and promoting the natural and uniform deposition of fibers on the web forming curtain, thereby obtaining a thin layer of waste with uniform thickness and good dispersion. The grounding system runs through the shear crusher, conveying system, and web laying mechanism frame to discharge excess charge and maintain system potential stability.

[0042] The recycling method includes the following steps:

[0043] Step 1: Pre-treat the basalt composite fiber needle-punched waste with a spray-on antistatic agent. The spray-on antistatic agent is a quaternary ammonium salt type, phosphate ester type, or polyether type antistatic agent, and the spray addition amount is 0.05-0.2 wt%. Specifically, the fibers in the basalt composite fiber needle-punched waste include basalt fibers and thermoplastic fibers, wherein the thermoplastic fibers are polypropylene fibers, polyethylene fibers, or a mixture of both.

[0044] Step 2: The waste material after antistatic pretreatment is mechanically sheared and crushed in a shearing fiber shredder to break the needle-punched fiber mother material into short fiber fragments with a length of about 10-30mm. An ion wind discharge system and a grounding system are set up in the crushing zone to neutralize static electricity. The material is then transported to the silo for stacking. During the transport and stacking process, the grounding system is used to neutralize the charge. A discharge plate is set at the outlet of the silo to release the residual charge, thereby preventing the fiber waste from agglomerating due to frictional charging.

[0045] In the present application, the ion wind discharge system is composed of a high-voltage generator, an ion wind nozzle and a discharge electrode plate. Negative ions are generated by ionizing air under high voltage to neutralize the charge on the surface of the fiber waste. The ion wind discharge system is installed at the discharge port of the shearing fiber crusher, above the conveying belt and at the outlet of the hopper, respectively. The ion wind nozzle is installed at the discharge port of the shearing fiber crusher to neutralize the friction charge generated during high-speed shearing of the fiber. The grounding system includes a conductive grounding wire, a conductive bracket, a conductive conveyor belt or a hopper bottom plate, etc. for timely introduction of residual charge into the grounding grid after neutralization to achieve potential balance. The discharge electrode plate is installed at the outlet of the hopper to ensure complete discharge of residual charge in the stacking and discharging process. The conveying system uses a negative pressure conveying system. One end of the conveying pipeline is connected to the outlet of the shearing crusher, and the other end is connected to the inlet of the hopper. The inner wall of the pipeline is grounded as a whole, and ion wind nozzles are arranged at key nodes of the pipeline to continuously neutralize static electricity generated during flow. In the present application, the crusher shell, the conveyor belt bracket, the hopper bottom plate and the conveying system are connected to the grounding end through conductive wires to form a complete charge discharge path. Step 3: The waste treated in step 2 is sent into the fiber carding equipment through the conveying belt for re-carding. The carding equipment is a needle roller type opening and carding machine, which includes a feed roller, a needle roller, a work roller, a stripping roller and a laying mechanism. The fiber waste is fully dispersed and stretched under the high-speed carding action of the needle teeth after entering the needle roller area through the feed roller, forming a single fiber dispersed state; after further homogenization by the work roller and the stripping roller, static electricity is neutralized by the ion wind discharge system arranged above the laying mechanism in the laying stage to prevent fiber from being charged and adhering or agglomerating; at the same time, a blower is arranged above the laying machine to generate a controllable downward air flow to promote the natural and uniform deposition of the fiber on the laying curtain, thereby obtaining a waste thin layer with uniform thickness and good dispersibility. The thickness of the single-layer thin layer is controlled within 2.0-3.0mm, and the required core layer thickness can be obtained by stacking multiple layers.

[0046] The application of basalt fiber needle felt prepared by the anti-static recovery method of basalt composite fiber needle felt of the present application is as follows: the re-carded needle fiber waste is directly used as the core layer of the composite board, and the basalt fiber cloth prepreg layer formed by laying the prepreg on both sides to form a rigid-flexible cooperative structure combining the outer layer high-strength skeleton and the inner layer uniform toughness core material, and then the gradient heating and hot pressing are carried out to obtain a "sandwich" structure composite board, as shown in Figure 2 Specifically, the "sandwich" structure composite board is obtained by hot pressing at 100℃ for 2h under a pressure of 2-4MPa, then hot pressing at 135℃ for 3h, and then hot pressing at 175℃ for 1h, and cooling. The prepreg of the basalt fiber cloth is one of epoxy resin, phenolic resin or unsaturated polyester resin, and the mass ratio of the prepreg to the basalt fiber cloth is 1:2-1:3.

[0047] The method not only solves the problem of electrostatic hazards in the recycling process, but also realizes high-value utilization of waste materials, and is suitable for automobile, rail transportation and building fields.

[0048] Example 1

[0049] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, an ion wind discharge system and a grounding system are configured in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 215.05MPa, the impact strength is 56.28kJ / m², and the thermal conductivity is 0.106W / (m·K).

[0050] Example 2

[0051] Basalt fiber / polyethylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, an ion wind discharge system and a grounding system are configured in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 215.05MPa, the impact strength is 56.28kJ / m², and the thermal conductivity is 0.106W / (m·K).

[0052] Example 3

[0053] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 199.36MPa, the impact strength is 52.48kJ / m², and the thermal conductivity is 0.118W / (m·K).

[0054] Example 4:

[0055] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 199.36MPa, the impact strength is 52.48kJ / m², and the thermal conductivity is 0.118W / (m·K).

[0056] Example 5:

[0057] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 199.36MPa, the impact strength is 52.48kJ / m², and the thermal conductivity is 0.118W / (m·K).

[0058] Example 6:

[0059] Basalt fiber / polypropylene needle fiber waste is treated by spraying 0.05wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 190.39MPa, the impact strength is 42.65kJ / m², and the thermal conductivity is 0.136W / (m·K).

[0060] Example 7:

[0061] Basalt fiber / polypropylene needle fiber waste is treated by spraying 0.1wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 197.56MPa, the impact strength is 53.46kJ / m², and the thermal conductivity is 0.119W / (m·K).

[0062] Example 8:

[0063] Basalt fiber / polypropylene needle fiber waste is treated by spraying 0.2wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 2.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 198.56MPa, the impact strength is 48.65kJ / m², and the thermal conductivity is 0.121W / (m·K).

[0064] Example 9:

[0065] Basalt fiber / polypropylene needle-punched fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, and a thin layer with a thickness of about 2.5mm is formed by needle roller opening and laying, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 201.49MPa, the impact strength is 55.37kJ / m², and the thermal conductivity is 0.120 W / (m·K).

[0066] Example 10:

[0067] Basalt / polypropylene needle-punched waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, and a thin layer with a thickness of about 3mm is formed by needle roller opening and laying, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 69%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 200.21MPa, the impact strength is 50.23kJ / m², and the thermal conductivity is 0.111 W / (m·K).

[0068] Example 11:

[0069] Basalt fiber / polypropylene needle-punched fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, and a thin layer with a thickness of about 3.0mm is formed by needle roller opening and laying, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 70%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 198.73MPa, the impact strength is 48.49kJ / m², and the thermal conductivity is 0.114 W / (m·K).

[0070] Example 12:

[0071] Basalt / polypropylene needle-punched waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and ion wind device and grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, and a thin layer with a thickness of about 3.0mm is formed by needle roller opening and laying, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 71%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 195.63MPa, the impact strength is 46.35kJ / m², and the thermal conductivity is 0.116W / (m·K).

[0072] Example 13:

[0073] Basalt / polypropylene needle-punched waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and ion wind device and grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, and a thin layer with a thickness of about 3.0mm is formed by needle roller opening and laying, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 71%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 195.63MPa, the impact strength is 46.35kJ / m², and the thermal conductivity is 0.116W / (m·K).

[0074] Example 14:

[0075] Basalt / polypropylene needle-punched waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and ion wind device and grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, and a thin layer with a thickness of about 3.0mm is formed by needle roller opening and laying, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 71%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under the pressure of 4MPa, it is first hot-pressed at 100℃ for 2h, then hot-pressed at 135℃ for 3h, and then hot-pressed at 175℃ for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 195.63MPa, the impact strength is 46.35kJ / m², and the thermal conductivity is 0.116W / (m·K).

[0076] Example 15:

[0077] Basalt fiber / polypropylene needle fiber waste is treated by spraying 0.2wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Unsaturated polyester resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 80°C for 1h, then hot-pressed at 100°C for 1.5h, and then hot-pressed at 120°C for 1.5h, and after cooling, a composite board is obtained. Test results show that the bending strength is 197.77MPa, the impact strength is 50.99kJ / m², and the thermal conductivity is 0.122W / (m·K).

[0078] Example 16:

[0079] Basalt fiber / polypropylene needle fiber waste is treated by spraying 0.2wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Unsaturated polyester resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 80°C for 1h, then hot-pressed at 100°C for 1.5h, and then hot-pressed at 120°C for 1.5h, and after cooling, a composite board is obtained. Test results show that the bending strength is 197.77MPa, the impact strength is 50.99kJ / m², and the thermal conductivity is 0.122W / (m·K).

[0080] Example 17:

[0081] Basalt fiber / polypropylene needle fiber waste is treated by spraying 0.2wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Unsaturated polyester resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 80°C for 1h, then hot-pressed at 100°C for 1.5h, and then hot-pressed at 120°C for 1.5h, and after cooling, a composite board is obtained. Test results show that the bending strength is 197.77MPa, the impact strength is 50.99kJ / m², and the thermal conductivity is 0.122W / (m·K).

[0082] Example 18:

[0083] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:3. Under a pressure of 2MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 195.46MPa, the impact strength is 51.44kJ / m², and the thermal conductivity is 0.114W / (m·K).

[0084] Example 19:

[0085] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 3MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 190.45MPa, the impact strength is 42.16kJ / m², and the thermal conductivity is 0.139W / (m·K).

[0086] Example 20:

[0087] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent to a carding machine, opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board is obtained. Test results show that the bending strength is 197.45MPa, the impact strength is 53.94kJ / m², and the thermal conductivity is 0.125W / (m·K).

[0088] Comparative Example 1:

[0089] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.03wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent into a carding machine, and is opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h, and after cooling, a composite board is obtained. The composite board is prepared. Test results show that the bending strength is 189.94MPa, the impact strength is 39.27kJ / m², and the thermal conductivity is 0.140W / (m·K).

[0090] Comparative Example 2:

[0091] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.3wt% quaternary ammonium salt type antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is sent into a carding machine, and is opened and laid into a thin layer with a thickness of about 3.0mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h, and after cooling, a composite board is obtained. The composite board is prepared. Test results show that the bending strength is 187.45MPa, the impact strength is 38.45kJ / m², and the thermal conductivity is 0.137W / (m·K).

[0092] Comparative Example 3:

[0093] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2 wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is fed into a carding machine, opened and laid into a thin layer with a thickness of about 1 mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4 MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board is obtained. The composite board is prepared by heat preservation at 100°C for 2h, heat preservation at 135°C for 3h, and heat preservation at 175°C for 1h (pressure 4 MPa). The test results show that the bending strength is 173.26 MPa, the impact strength is 44.16 kJ / m², and the thermal conductivity is 0.147 W / (m·K).

[0094] Comparative Example 4:

[0095] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2 wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is fed into a carding machine, opened and laid into a thin layer with a thickness of about 1 mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4 MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board is obtained. The test results show that the bending strength is 173.26 MPa, the impact strength is 44.16 kJ / m², and the thermal conductivity is 0.147 W / (m·K).

[0096] Comparative Example 5:

[0097] Basalt fiber / polypropylene needled fiber waste is treated by spraying 0.2 wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and a grounding system are arranged in the crushing and conveying link, and a discharge electrode plate is arranged at the outlet of the stock bin. The treated waste is fed into a carding machine, opened and laid into a thin layer with a thickness of about 1 mm by a needle roller, and multiple layers are stacked to form a target core layer. The volume fraction of the core layer waste is controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth is laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth is 1:2. Under a pressure of 4 MPa, it is first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board is obtained. The test results show that the bending strength is 173.26 MPa, the impact strength is 44.16 kJ / m², and the thermal conductivity is 0.147 W / (m·K).

[0098] Comparative Example 6:

[0099] Basalt fiber / polypropylene needle-punched fiber waste was treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and grounding system were configured in the crushing and conveying link, and a discharge electrode plate was arranged at the outlet of the hopper. The treated waste was fed into a carding machine, and a thin layer with a thickness of about 3.0mm was formed by needle roller opening and laying, and multiple layers were stacked to form the target core layer. The volume fraction of the core layer waste was controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth was laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth was 1:1. Under the pressure of 4MPa, it was first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board was obtained. Test results show that the bending strength is 185.28MPa, the impact strength is 38.24kJ / m², and the thermal conductivity is 0.143W / (m·K).

[0100] Comparative Example 7:

[0101] Basalt fiber / polypropylene needle-punched fiber waste was treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and grounding system were configured in the crushing and conveying link, and a discharge electrode plate was arranged at the outlet of the hopper. The treated waste was fed into a carding machine, and a thin layer with a thickness of about 3.0mm was formed by needle roller opening and laying, and multiple layers were stacked to form the target core layer. The volume fraction of the core layer waste was controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth was laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth was 1:2. Under the pressure of 1MPa, it was first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board was obtained. Test results show that the bending strength is 175.69MPa, the impact strength is 37.25kJ / m², and the thermal conductivity is 0.138W / (m·K).

[0102] Comparative Example 8:

[0103] Basalt fiber / polypropylene needle-punched fiber waste was treated by spraying 0.2wt% quaternary ammonium salt antistatic agent, and an ion wind discharge system and grounding system were configured in the crushing and conveying link, and a discharge electrode plate was arranged at the outlet of the hopper. The treated waste was fed into a carding machine, and a thin layer with a thickness of about 3.0mm was formed by needle roller opening and laying, and multiple layers were stacked to form the target core layer. The volume fraction of the core layer waste was controlled at 68%. Epoxy resin pre-impregnated basalt fiber cloth was laid on both sides of the core layer, and the mass ratio of the pre-impregnated material to the fiber cloth was 1:2. Under the pressure of 6MPa, it was first hot-pressed at 100°C for 2h, then hot-pressed at 135°C for 3h, and then hot-pressed at 175°C for 1h. After cooling, a composite board was obtained. Test results show that the bending strength is 188.96MPa, the impact strength is 39.38kJ / m², and the thermal conductivity is 0.141W / (m·K).

[0104] As Figures 3-10 shown, the influence of different parameters on the performance of the "sandwich" structure composite board obtained by the present application. Among them, Figure 3 The comparative curve of the influence of different thermoplastic fiber types (polypropylene, polyethylene and their mixture) on the thermal conductivity, bending strength and impact strength of the composite board shows that the polypropylene fiber system has better mechanical and thermal insulation properties. Figure 4 The influence curve of different antistatic agents (quaternary ammonium salt type, phosphate type and polyether type) on the thermal conductivity, bending strength and impact strength of the composite board shows that the quaternary ammonium salt type antistatic agent has the best comprehensive effect. Figure 5 The influence curve of different antistatic agent spray addition amount (0.05-0.2wt%) on the performance of the composite board. When the spray amount is low (such as 0.05wt%), the fiber surface is not covered enough, the static electricity suppression effect is limited, and the fiber aggregation is easy to occur, which leads to uneven dispersion and low mechanical properties; with the increase of the spray amount, the fiber surface charge is neutralized, the dispersion and interfacial adhesion are significantly improved, and the bending strength and impact performance of the composite board are gradually improved; when the spray amount exceeds 0.2wt%, the antistatic agent is enriched on the surface of the fiber, which hinders the resin infiltration and weakens the interfacial adhesion, resulting in a decrease in mechanical properties, therefore, the performance is best at 0.2wt%. Figure 6 The influence curve of different waste volume fraction (65%-75%) on the thermal conductivity, bending strength and impact strength of the composite board. When the waste volume fraction is low (<68%), the content of flexible thermoplastic fiber in the core layer is insufficient, the structure is dense but the interfacial toughness is poor, the bending strength is high but the impact performance is low, with the increase of the waste ratio, the energy absorption and buffering capacity of the core layer are enhanced, and the mechanical toughness and thermal insulation are improved simultaneously. When the waste volume fraction is controlled at 68%-73%, the porosity of the core layer and the interfacial resin permeability reach a balance, which not only ensures sufficient interfacial adhesion but also maintains good thermal resistance performance, thereby realizing the best synergy of mechanical properties and thermal insulation performance of the composite board. If the volume fraction continues to increase (>73%), the fiber accumulation is too dense, which makes it difficult for the resin to fully infiltrate, and the interfacial defects and air gaps increase, resulting in a decrease in mechanical strength and thermal conductivity. Figure 7 The comparative curve of different prepreg resin types (epoxy resin, phenolic resin and unsaturated polyester resin) on the performance of the composite board shows that the epoxy resin system has higher bending strength and impact toughness. Figure 8 The influence curve of different prepreg and basalt fiber cloth mass ratio (1:2-2:5) on the performance of the composite board shows that appropriately increasing the resin ratio helps to enhance the interfacial wettability and mechanical properties. Figure 9 The influence curve of different holding pressure (2-4MPa) on the thermal conductivity, bending strength and impact strength of the composite board shows that with the increase of the pressure, the interfacial density is enhanced, and the comprehensive performance is improved, and the performance is best at 4MPa.Figure 10 The influence curve of different single-layer waste thickness (1-3.5mm) on the thermal conductivity, bending strength and impact strength of the composite board, when the single-layer waste thickness is less than 2mm, the flexible layer is insufficient, it is difficult to buffer stress, resulting in the decrease of structural toughness; when the thickness exceeds 3mm, the fiber combination is loose, the resin is insufficiently infiltrated, and internal holes are easily formed, causing the decrease of mechanical properties; when the thickness is controlled within the range of 2-3mm, the flexible core layer and the rigid surface layer are well matched, the stress is uniformly distributed, and the bending strength, impact toughness and thermal conductivity of the composite board are comprehensively optimal.

[0105] In summary, Figures 3-10 The system shows the optimization trend of the process parameters of the application, and provides a basis for the selection of the core layer and surface layer structure design and forming conditions of the composite board.

[0106] Table 1 Typical board performance corresponding relationship

[0107]

[0108] The experimental results show that when the core layer waste volume fraction is 68%-73%, the best balance between bending strength and impact performance can be obtained, the bending strength of the composite board is greater than or equal to 190MPa, the impact strength is greater than or equal to 40kJ / m², and the thermal conductivity is less than or equal to 0.14W / (m·K), realizing the synergistic optimization of mechanical properties and thermal insulation performance.

[0109] Note that the design of the above digital prototype model, the parameter setting of each material, and the selection of the measurement plane are only preferred embodiments of the application and the technology principles applied. Those skilled in the art will understand that the application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of the application. Therefore, although the application has been described in more detail through the above embodiments, the application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the application, and the scope of the application is determined by the scope of the appended claims.

Claims

1. A method for the antistatic recycling of basalt composite fiber needle-punched felt, characterized in that, Includes the following steps: Step 1: Pre-treat basalt composite fiber needle-punched waste material with a spray-type antistatic agent at a dosage of 0.05-0.2 wt%. Step 2: The waste material pretreated with antistatic agents in Step 1 is mechanically sheared and crushed, and then transported to the silo for stacking. An ion wind discharge system and a grounding system are set up in the crushing zone to neutralize static electricity. During the conveying and stacking process, the grounding system is used to neutralize the charge. A discharge plate is set at the outlet of the silo to release the residual charge. The crushing process is carried out by a shear-type fiber shredder, which cuts the needle-punched fiber parent material into short fiber fragments with a length of 10-30mm. Step 3: The waste material processed in Step 2 is fed into the fiber combing equipment via a conveyor belt. It is then combed again by needle roller opening and web laying. During the web laying stage, the ion wind discharge system set above the web laying mechanism realizes airflow-assisted web laying and charge neutralization, so that the waste material is evenly dispersed to form a thin layer of uniform thickness. The thickness of a single layer is controlled at 2.0-3.0 mm, and multiple layers can be stacked to form the target core layer thickness. The ion wind discharge system is installed at the discharge port of the shear-type fiber crusher, above the conveyor belt, and at the outlet of the hopper.

2. The antistatic recycling method for basalt composite fiber needle-punched felt according to claim 1, characterized in that: Step 1: The spray-type antistatic agent is a quaternary ammonium salt type, phosphate ester type, or polyether type antistatic agent.

3. The antistatic recycling method for basalt composite fiber needle-punched felt according to claim 1, characterized in that: Step 1, the fibers in the basalt composite fiber needled waste include basalt fibers and thermoplastic fibers, wherein the thermoplastic fibers are polypropylene fibers, polyethylene fibers, or a mixture of the two.

4. The antistatic recycling method for basalt composite fiber needle-punched felt according to claim 1, characterized in that: Step 2: The ion wind discharge system consists of a high-voltage generator, an ion wind nozzle, and a discharge electrode plate. The ion wind nozzle is installed at the discharge port of the shear-type fiber shredder to neutralize the frictional charge generated by the fiber during high-speed shearing.

5. The antistatic recycling method for basalt composite fiber needle-punched felt according to claim 1, characterized in that: Step 2: The grounding system includes a conductive grounding wire, a conductive support, a conductive conveyor belt, and a hopper bottom plate. The grounding system runs through the shear crusher, the conveying system, and the mesh laying mechanism frame. It is used to promptly guide the neutralized residual charge into the ground grid to achieve potential balance. The conveying system adopts a negative pressure conveying system. One end of the conveying pipeline is connected to the outlet of the shear crusher, and the other end is connected to the inlet of the hopper. The inner wall of the pipeline is grounded as a whole with the conveying system. Ion air nozzles are arranged at key nodes of the pipeline to continuously neutralize the static electricity generated by the flow.

6. The application of the basalt fiber needled felt produced by the antistatic recycling method of basalt composite fiber needled felt according to claim 1, characterized in that: The re-combed needle-punched fiber waste is used directly as the core layer of the composite board, and basalt fiber cloth prepreg layers formed by prepreg material are laid on both sides to form a rigid-flexible synergistic structure that combines a high-strength outer skeleton with a uniform and tough inner core material. The sandwich structure composite board is obtained by gradient heating and hot pressing curing.

7. The application of the basalt fiber needled felt produced by the antistatic recycling method of basalt composite fiber needled felt according to claim 6, characterized in that: Under a pressure of 2-4 MPa, the material is first hot-pressed at 100℃ for 2 hours, then hot-pressed at 135℃ for 3 hours, and then hot-pressed at 175℃ for 1 hour. After cooling, a sandwich structure composite board is obtained.

8. The application of the basalt fiber needled felt produced by the antistatic recycling method of basalt composite fiber needled felt according to claim 6, characterized in that: The prepreg of the basalt fiber cloth is one of epoxy resin, phenolic resin or unsaturated polyester resin, and the mass ratio of the prepreg to the basalt fiber cloth is 1:2-1:3.

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