Integrated preparation method of natural rubber antiskid antistatic fireproof plate

Abstract

The application discloses an integrated preparation method of a natural rubber antiskid antistatic fireproof plate, adopts a one-step synchronous mixing and single-molding synchronous vulcanization integrated process, only includes one-time closed mixing and one-time molding vulcanization, and does not include secondary mixing, secondary vulcanization and post-processing embossing processes; the main body of the natural rubber is synchronously mixed with an environment-friendly composite conductive filler, a compounded halogen-free flame-retardant system and rubber basic processing aids in a mixing stage; the environment-friendly composite conductive filler is a modified graphite microsheet and a modified potassium salt powder of lignosulfonate compound system; the compounded halogen-free flame-retardant system is formed by ternary compounding of superfine magnesium hydroxide, melamine cyanurate and methyl silicone resin micro powder; and the integrated preparation method comprises the following steps: raw material premixing and pretreatment; one-step closed synchronous mixing; rubber stock standing and curing; mold pretreatment; rubber stock molding positioning; synchronous molding vulcanization and antiskid texture integrated forming; demolding and plate taking; finished product post-processing; performance re-inspection, classification and storage.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly polymer composite material processing technology, specifically to an integrated preparation method for a natural rubber anti-slip, anti-static, and flame-retardant sheet. Background Technology

[0002] Natural rubber possesses environmental advantages such as high elasticity, high wear resistance, biodegradability, excellent processing fluidity, and renewable raw materials, making it the mainstream base material for industrial anti-slip rubber sheets, anti-static operating mats, and explosion-proof and flame-retardant rubber mats. However, existing industrialized multi-functional natural rubber sheet production processes suffer from four major industry pain points: significant process fragmentation, high energy consumption, additive system pollution, and poor overall performance matching.

[0003] First, traditional multi-functional rubber sheets are manufactured using a segmented, multi-process method, which is complex and results in high energy consumption and material loss. The conventional process involves four independent steps: First, natural rubber is plasticized and basic reinforcing fillers are mixed to obtain a base rubber masterbatch; second, conductive fillers such as carbon black and metal powders are separately mixed to prepare an antistatic modified rubber compound; third, halogenated flame retardants and flame retardant synergists are separately mixed to prepare a flame-retardant modified rubber compound; fourth, the modified rubber compound is compounded a second time, then a smooth rubber substrate is vulcanized on a flat sheet, followed by post-processing steps such as secondary molding, surface rolling, and etching to create anti-slip textured surfaces. This multi-stage mixing, multiple vulcanization, and secondary embossing process involves at least two heating and vulcanization cycles, increasing energy consumption by more than 35% per batch for heating, holding, and cooling cycles. Furthermore, the intermediate transfer process generates rubber scraps and volatile organic compounds, failing to meet energy-saving and environmentally friendly production requirements. The connection between multiple processes can also cause uneven dispersion of the various components of the adhesive, breakage of the antistatic conductive path, agglomeration and precipitation of flame retardant additives, poor adhesion between the surface anti-slip texture and the substrate, and defects such as the peeling off of the surface anti-slip texture, fluctuation of surface resistivity, and decay of flame retardant performance during use.

[0004] Secondly, existing antistatic filler systems are not environmentally friendly enough and have poor stability when used with natural rubber systems. The industry commonly uses highly conductive carbon black and graphite powder as antistatic fillers. However, high carbon black content significantly reduces the tensile elasticity and tear strength of natural rubber, leading to harder and more brittle sheets; low carbon black content fails to form a continuous conductive network, making it difficult to maintain a stable surface resistivity of 10 Ω·cm. 6 ~10 9 Ω standard anti-static range. Some companies use zinc and aluminum powder as conductive fillers. These metal powders are prone to oxidation and agglomeration, posing a risk of dust explosions during storage and mixing. Furthermore, these metal powders are non-biodegradable, making them difficult to separate during waste rubber sheet recycling and creating significant solid waste disposal challenges. A small number of products on the market use ionic liquid conductive additives, which are prone to volatilization during high-temperature vulcanization, releasing volatile organic pollutants and failing to meet low-VOC environmental control standards for workshops.

[0005] Third, traditional flame retardant systems heavily utilize halogenated flame retardants, posing environmental and safety hazards. Chloroprene rubber and bromine-based flame retardant masterbatches are mainstream flame retardant additives in rubber. Halogenated flame retardant materials release dioxins and hydrogen halides, toxic and corrosive fumes during combustion, posing serious safety hazards in enclosed work environments such as chemical explosion-proof facilities, food processing plants, and biopharmaceutical laboratories. The EU REACH and China's GB38508-2020 standard for the restriction of hazardous substances in rubber products have strictly limited the use of bromine and chlorohalogenated additives. Existing halogen-free flame retardant solutions mostly use aluminum hydroxide or magnesium hydroxide as single fillers, requiring an addition amount of more than 80 parts to achieve a V0 flame retardant rating. The excessively high inorganic filler content disrupts the cross-linked structure of natural rubber molecular chains, significantly reducing the elasticity and anti-slip friction coefficient of the sheet, making it impossible to simultaneously achieve a balanced performance of flame retardancy, anti-slip, and antistatic properties.

[0006] Fourth, the anti-slip structure molding and rubber vulcanization are not synchronized, resulting in a short product lifespan. Traditional glossy vulcanized substrates are formed by secondary embossing of anti-slip textures, relying solely on the micro-deformation of the rubber surface after vulcanization to create the raised and recessed patterns. There is no cross-linking of rubber molecules at the root of the texture. Under long-term heavy pressure, immersion in acid and alkali solvents, and frequent friction, the anti-slip texture is prone to wear, peeling, and eventual complete detachment. The segmented molding process cannot achieve integrated cross-linking between the substrate and the anti-slip texture, resulting in a delamination interface between the substrate surface and the substrate's mechanical properties. This leads to decreased tear resistance and abrasion resistance, shortened product replacement cycles, and increased overall production and usage costs.

[0007] The existing publicly available technologies include the following categories of preparation processes, materials, and molds:

[0008] 1. The manufacturing process of antistatic and flame-retardant rubber pads involves two stages of mixing, incorporating conductive carbon black and magnesium hydroxide flame retardant respectively. After vulcanization, anti-slip patterns are rolled onto the surface. This process has technical defects such as multiple mixing stages, secondary embossing, high energy consumption, and uneven dispersion of additives.

[0009] 2. Halogen-free flame-retardant natural rubber composite material only solves the problem of flame retardant performance optimization, but does not simultaneously achieve antistatic modification and integrated anti-slip molding, requiring additional post-processing to create anti-slip textures;

[0010] 3. The anti-slip and anti-static rubber sheet mold only improved the mold structure, without integrating and coordinating the overall preparation process and environmentally friendly additive system, and still uses the traditional multi-stage mixing and vulcanization process.

[0011] In summary, the industry currently lacks an energy-saving and environmentally friendly manufacturing process that uses renewable natural rubber as a base material, employs a single-stage one-step mixing method, and simultaneously completes vulcanization crosslinking and anti-slip texture molding in a single molding process. This process combines environmentally friendly halogen-free flame retardant and low-VOC conductive fillers, and achieves multiple integrated properties such as anti-slip, anti-static, and flame retardant properties through a single heating and molding process. Summary of the Invention

[0012] The purpose of this invention is to address the technical shortcomings of existing multi-functional natural rubber sheets, such as high energy consumption from segmented and multi-process processing, pollution from halogenated flame retardant additives, damage to rubber elasticity from conductive fillers, poor bonding strength in secondary molding of anti-slip textures, and the inability to simultaneously and evenly match multiple properties. This invention provides an integrated preparation method for natural rubber anti-slip, anti-static, and flame-retardant sheets, specifically an integrated one-step molding process for multi-functional natural rubber sheets that combine anti-slip, anti-static, and halogen-free flame retardant properties. This process employs a one-step, single-tank simultaneous mixing of all environmentally friendly additives, and uses an anti-slip texture molding module to integrally mold the sheet substrate during a single compression molding and vulcanization process. With its surface anti-slip textured structure, this product uses no halogenated flame retardants or low-VOC renewable conductive fillers throughout the entire process. It completes all processes—plasticization, cross-linking, antistatic modification, halogen-free flame retardant modification, and anti-slip texture molding—in a single heating and molding cycle. This simplifies the production process, reduces heat consumption and organic waste gas emissions, and achieves renewable base materials, environmentally friendly additives, energy-saving processes, and stable synergistic performance across multiple properties. It is suitable for energy-saving and environmentally friendly rubber sheet production scenarios such as industrial explosion-proof applications, laboratory and power distribution room green materials, industrial workshop workbenches, insulated anti-slip floors in power distribution rooms, chemical explosion-proof work areas, and laboratory antistatic work surfaces. This invention provides a complete integrated preparation solution, simplifying the production process, reducing production energy consumption, and ensuring all components are environmentally friendly and recyclable, achieving stable and synergistic anti-slip, antistatic, and flame-retardant properties of natural rubber sheets.

[0013] The first aspect of this invention is to provide an integrated preparation method for a natural rubber anti-slip, anti-static, and flame-retardant sheet. This method employs a one-step synchronous mixing and single-compression synchronous vulcanization process to create an integrated anti-slip texture. It includes only one closed mixing and one compression vulcanization, without secondary mixing, secondary vulcanization, or post-processing embossing steps. During the mixing stage, natural rubber substrate, environmentally friendly composite conductive filler, a compounded halogen-free flame-retardant system, and rubber basic processing aids are simultaneously added. Low-temperature, segmented mixing in a closed environment inhibits the volatilization of the aids. The single-compression synchronous vulcanization process for the integrated anti-slip texture is equipped with an integrated mold containing an anti-slip texture forming module. The upper and lower molds of the integrated mold are respectively equipped with anti-slip concave-convex texture forming structures. During the compression and heating vulcanization process, the rubber melt synchronously cross-links, solidifies, and fills the texture cavity. The sheet substrate and the surface anti-slip texture molecular chains are cross-linked into one, and the finished anti-slip, anti-static, and flame-retardant rubber sheet is produced by a single compression molding.

[0014] The raw materials of the integrated preparation method, by weight, include: 100 parts of natural raw rubber as the main natural rubber substrate, 12-28 parts of environmentally friendly composite conductive filler, the compounded halogen-free flame retardant system, and the rubber basic processing aids. The rubber basic processing aids include the environmentally friendly composite conductive filler, the compounded halogen-free flame retardant system, reinforcing fillers, vulcanization crosslinking system powder components, processing lubricants, anti-aging stabilizers, coupling modifiers, and dispersion and leveling agents. The environmentally friendly composite conductive filler is a compound system of modified graphite microflakes and lignin sulfonate modified potassium salt powder. The compounded halogen-free flame retardant system is a ternary compound of ultrafine magnesium hydroxide, melamine cyanurate, and methyl silicone resin micropowder, without the addition of halogenated flame retardant additives or heavy metal conductive fillers throughout the entire process.

[0015] The integrated preparation method includes:

[0016] S1, raw material premixing and pretreatment;

[0017] S2, one-step closed synchronous intensive mixing;

[0018] S3, rubber compound is left to mature under static conditions;

[0019] S4, mold pretreatment;

[0020] S5, positioning of the rubber material in the mold;

[0021] S6, synchronous molding vulcanization and anti-slip texture are integrally formed;

[0022] S7, demold and remove plate;

[0023] S8, finishing touches;

[0024] S9, performance re-inspection and classified storage.

[0025] Preferably, S1 includes:

[0026] S11, weigh all the solid powder of the rubber-based processing aid according to weight parts and put it into a closed low-speed premixer; wherein, the compound halogen-free flame retardant system is 45-65 parts, the reinforcing filler is 15-30 parts, the vulcanization crosslinking system powder combination is 3.2-6.5 parts, the processing lubricant is 2.0-4.8 parts, the anti-aging stabilizer is 1.2-3.0 parts, the coupling modifier is 1.0-2.6 parts, and the dispersion and leveling aid is 0.5-1.8 parts;

[0027] S12, room temperature stirring and premixing for 8-15 minutes, the premixing process is equipped with a closed negative pressure dust collection device, and after stirring, a uniform pre-dispersed powder mixture is obtained.

[0028] Preferably, S2 includes:

[0029] S21, put natural raw rubber into a pressure mixer, with a rotor speed of 30-45 r / min and an initial temperature of 65-75℃ in the mixing chamber, and plasticize it separately for 2-4 minutes until the natural rubber is completely softened and wraps around the rollers;

[0030] S22, add the uniformly pre-dispersed powder mixture at once, and mix it in two stages at a constant temperature: the first stage is at a constant temperature of 75-85℃ for 5-8 minutes, and the second stage is heated to 95-110℃ and mixed at a constant temperature for 3-6 minutes.

[0031] S23, the internal mixer is fully enclosed and equipped with a waste gas condensation and recovery device. The temperature of the rubber compound at the end of the mixing process is controlled to be ≤115℃. After the rubber is discharged, it is cooled down to below 40℃ by water cooling to obtain an integrated composite modified rubber compound.

[0032] Preferably, the S3 rubber compound static curing includes: cutting the cooled integrated composite modified rubber compound into standard rubber strips of uniform specifications, placing them in a light-proof and sealed storage environment at room temperature for static curing for 12 to 24 hours to obtain the cured standard rubber strips, eliminating the internal stress of the rubber compound during internal mixing and improving the fluidity of subsequent molding.

[0033] Preferably, the S4 mold pretreatment includes:

[0034] S41, Prepare an integrated anti-slip texture molding die. The integrated anti-slip texture molding die consists of an upper die, a lower die, and a locking and positioning mechanism. The inner surface of the upper die is integrally engraved with anti-slip raised patterns. The height of the anti-slip raised patterns is 0.8 to 1.5 mm, and the spacing between the raised patterns is 3 to 6 mm.

[0035] S42, Before molding, water-based silicone-based environmentally friendly release agent is evenly sprayed onto the inner wall of the cavity of the integrated anti-slip texture molding mold. The entire set of integrated anti-slip texture molding molds is then placed in a preheating oven and preheated to 130-140℃ for later use.

[0036] Preferably, the S5 rubber material molding positioning includes:

[0037] S51, Take out the cured standard rubber strip and lay it flat on the preheated integrated anti-slip texture molding die;

[0038] S52, the adhesive material is laid to completely cover the internal area of ​​the cavity of the lower mold, with a 5% to 8% overflow allowance;

[0039] S53, close the upper and lower molds, and pre-pressurize the mold locking mechanism with 3-5 MPa to complete the positioning and mold locking.

[0040] Preferably, the S6 synchronous molding vulcanization and anti-slip texture integral molding includes:

[0041] S61, the mold that has completed the positioning and locking process is sent into the flat vulcanizing machine;

[0042] S62 is a three-stage temperature and pressure controlled processing method; wherein the three stages include:

[0043] First heating stage: clamping pressure 8-12MPa, heating rate 2℃ / min, heating to vulcanization constant temperature 145-155℃;

[0044] Second constant temperature vulcanization section: maintain temperature at 145-155℃ and pressure at 8-12MPa, hold pressure for vulcanization for 12-22min, the molten rubber melt completely fills the cavity of the upper mold anti-slip texture module under pressure, and the rubber matrix and anti-slip texture cross-link and solidify simultaneously.

[0045] The third slow cooling and shaping stage: the heating system is turned off, the mold clamping pressure is reduced to 3-5 MPa for low-pressure heat preservation, and the mold is naturally cooled to below 60°C.

[0046] Preferably, the S7 demolding plate includes:

[0047] S71, after the mold temperature drops below 60℃, the mold is unlocked and opened to completely remove the integrated molded rubber sheet semi-finished product;

[0048] S72, trim the excess material from the edge of the board, crush and pulverize all the scraps, and return them to the one-step closed synchronous mixing process in S2 for recycling, achieving zero waste of production materials.

[0049] Preferably, the S8 finishing process includes:

[0050] S81, remove irregular overflow and burrs from the edge of the rubber sheet, and place the cleaned sheet in a room temperature and ventilated environment for 4 to 8 hours to release trace amounts of residual small molecule volatiles from the vulcanization.

[0051] S82, after standing, sample and test the basic physical and chemical properties of the board thickness, dry friction coefficient, surface electrostatic resistivity, vertical flame retardancy rating and tensile strength. Boards that pass the initial screening are uniformly cut to the standard size required by the customer, and unqualified products are all crushed and recycled.

[0052] Preferably, the S9 performance re-inspection and classification warehousing includes:

[0053] S91, randomly sample the boards that pass the initial screening in batches for a full set of re-inspections on anti-slip, anti-static, flame retardant and mechanical properties;

[0054] S92 stipulates that products that pass the re-inspection are classified and stored in sealed warehouses according to the thickness of the sheet, the specifications of the finished product, and the applicable scenarios; products that fail the re-inspection are crushed and returned to the mixing process for reprocessing.

[0055] The beneficial effects of the method of the present invention are as follows:

[0056] 1. The process is extremely simple, energy-saving and environmentally friendly, significantly reducing production energy consumption and pollutant emissions: This invention eliminates four core processes: segmented plasticizing, batch-by-batch functional masterbatch mixing, secondary vulcanization, and surface embossing. The complete production process includes only one internal mixing and one molding vulcanization. The number of heating cycles per batch of product is reduced from the traditional 2-3 times to 1 time, and the steam and electricity energy consumption per unit of product is reduced by 32%-40%. The entire process of internal mixing and molding is carried out under closed negative pressure for waste gas recovery. The halogen-free flame retardant system burns without hydrogen halide and dioxin toxic fumes. The VOC release of bio-based conductive fillers and processing aids is far lower than that of petroleum-based and halogenated additives. 100% of the scraps from the production process are crushed, recycled and reused, and there is no industrial solid waste discharge. This aligns with energy-saving and environmental protection industrial policies and meets the priority review conditions in the field of new materials.

[0057] 2. Integrated cross-linking molding, high bonding strength of anti-slip structure, and extended product service life: The anti-slip texture is formed simultaneously by molding and vulcanization. The substrate and the anti-slip texture are cross-linked and cured simultaneously. The molecular chains are continuous without layering interfaces. The anti-slip texture has the same tear resistance and wear resistance as the board body. Traditional secondary embossed rubber sheets will peel off after 3,000 consecutive frictions. The board prepared by this invention will not be damaged after 8,000 consecutive frictions, and the friction coefficient will decrease by less than 8%, which will greatly reduce the product replacement cost for enterprises.

[0058] 3. A fully bio-based, halogen-free environmentally friendly additive system suitable for various green application scenarios: The base material is renewable natural rubber, the conductive filler is modified lignin sulfonate from papermaking solid waste, the flame retardant system contains no halogens, and the lubricating and anti-aging additives are all derived from vegetable oils and natural resins. After the finished board is discarded, the rubber hydrocarbons can be recovered by thermal decomposition, and the inorganic powder can be separated, recycled and reused. There are no recalcitrant plastics, heavy metals, or halogen residues. It can be applied to food processing workshops, biomedical laboratories, closed chemical explosion-proof plants and other scenarios with strict requirements for environmental protection and flue gas toxicity.

[0059] 4. Multiple performance characteristics are simultaneously balanced and stable, without any performance antagonism: The low-filling compound conductive filler and the ternary compound halogen-free flame retardant system combined with fumed silica reinforcement avoid the problem of a significant decrease in rubber elasticity caused by a single high-filling inorganic powder; the finished product simultaneously achieves high anti-slip properties, stable antistatic properties, V0-level flame retardancy, and excellent elastic mechanical properties. The surface resistivity fluctuation range of each batch of products is ≤0.5 orders of magnitude. The flame retardant test shows no dripping or dense smoke. The anti-slip friction coefficient decreases little under dry and wet environments, solving the industry problem that traditional products can only enhance one performance while other indicators deteriorate significantly.

[0060] 5. Strong process controllability, wide parameter window, and high adaptability to industrial mass production: The one-step internal mixing and single-stage molding process parameters have a wide adjustment range. The raw material component filling amount can be flexibly adjusted within a limited range. The anti-slip texture module of the mold can be changed to different textures such as grid, dots, and stripes according to customer needs. Different anti-slip style products can be produced by simply changing the upper mold. There is no need to adjust the core mixing and vulcanization process. The production line has a high degree of universality. There is no need to add multiple sets of mixing and embossing special equipment. The equipment investment cost is reduced by 45%, which is suitable for large, medium and small rubber product enterprises to carry out large-scale continuous production. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0062] Figure 1 A flowchart illustrating the integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to an embodiment of the present invention. Detailed Implementation

[0063] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0066] like Figure 1 As shown, embodiments of the present invention provide an integrated preparation method for a natural rubber anti-slip, anti-static, and flame-retardant sheet. The entire process involves only one closed mixing process and one molding and vulcanization process, without secondary mixing, secondary vulcanization, or post-embossing steps. During the mixing stage, natural rubber substrate, environmentally friendly composite conductive filler, compounded halogen-free flame retardant system, and rubber basic processing aids are simultaneously added. Low-temperature segmented mixing in a closed environment inhibits the volatilization of the aids. The molding process is equipped with an integrated mold with a built-in anti-slip texture molding module. The upper and lower molds are respectively set with anti-slip concave and convex texture molding structures. During the molding and heating vulcanization process, the rubber melt is simultaneously cross-linked and cured, filling the texture cavity. The molecular chains of the sheet substrate and the surface anti-slip texture are cross-linked into one. A single molding output is the finished anti-slip, anti-static, and flame-retardant rubber sheet, without any surface post-treatment process. The raw material components are limited by weight as follows: 100 parts natural raw rubber; 12-28 parts environmentally friendly composite conductive filler; 45-65 parts compound halogen-free flame retardant system; 15-30 parts reinforcing filler; 3.2-6.5 parts vulcanization crosslinking system; 2.0-4.8 parts processing lubricant; 1.2-3.0 parts anti-aging stabilizer; 1.0-2.6 parts coupling modifier; and 0.5-1.8 parts dispersion and leveling agent.

[0067] Detailed selection and function of each raw material component:

[0068] (1) Natural raw rubber: The standard natural rubber SCR5, which is made from fresh latex coagulation, has a Mooney viscosity of ML(1+4) of 62-70 at 100℃. The raw material comes from the latex products of natural rubber trees and is a renewable bio-based polymer material. Waste boards can be recycled through thermal pyrolysis and biodegradation, leaving no difficult-to-degrade plastic residues. SCR5 has low impurity content, high molecular chain regularity, excellent elasticity and cross-linking properties, and is suitable for one-step rapid mixing processing.

[0069] (2) Environmentally friendly composite conductive filler: It adopts a modified graphite micro-flakes + bio-based ion-conductive powder compound system, which is free of heavy metals and high carbon black filler; the modified graphite micro-flakes have a particle size of 5-12μm and are modified with silane coupling and branching on the surface, with an addition amount of 8-20 parts; the bio-based ion-conductive powder is lignin sulfonate modified potassium salt powder with a particle size of 2-6μm, with an addition amount of 4-8 parts; the two compound can form a continuous three-dimensional conductive network with low total filler content, and stably control the surface resistivity of the board to 10. 6 ~10 9 Ω meets national standards for antistatic properties; lignin sulfonate is derived from a byproduct of the papermaking industry, making solid waste resources available. It has no VOC emissions, and high-temperature sulfidation does not release toxic fumes, thus balancing conductivity and environmental friendliness.

[0070] (3) Compound halogen-free flame retardant system: It is a ternary compound of ultrafine magnesium hydroxide, melamine cyanurate and silicon-based flame retardant synergist, which does not contain bromine or chloro halides throughout the process; the ultrafine magnesium hydroxide has a particle size of 1-3 μm and is surface-coupled and activated, with an addition amount of 30-42 parts; the melamine cyanurate (MCA) addition amount is 10-16 parts; the methyl silicone resin micro powder synergist addition amount is 5-7 parts; the ternary compound system synergistically retards flame, magnesium hydroxide decomposes at high temperature to release crystal water to cool down and suppress smoke, MCA captures combustion free radicals in the gas phase to block the chain reaction, and silicone resin forms a dense silicon carbon barrier layer to isolate oxygen during combustion. The total filling amount is controlled in the range of 45-65 parts, without the need for ultra-high inorganic filler filling, and will not damage the elasticity and anti-slip friction coefficient of natural rubber. The combustion rating can reach UL94V0 level, with low smoke production and no corrosive smoke.

[0071] (4) Reinforcing filler: Precipitated silica with a specific surface area of ​​140-180 m² / g, which replaces traditional carbon black for reinforcement, improves the tensile and tear strength of rubber, and at the same time helps to improve the anti-slip friction coefficient of the board surface. It has low dust and no black pollution. The finished board can be customized with light-colored appearance, which is suitable for use in laboratories and food workshops.

[0072] (5) Vulcanization crosslinking system: 0.8-1.6 parts sulfur, 1.5-3.2 parts sulfenamide accelerator CBS, 0.9-1.7 parts zinc oxide, low temperature slow vulcanization system, suitable for one-step synchronous mixing, uniform vulcanization, no local over-sulfurization or under-sulfurization defects, and stable crosslinking density.

[0073] (6) Processing lubricants: palm oil-based stearate and plant-based paraffin are all derived from plant oil extracts, replacing petroleum-based lubricants. They have low VOC, improve the flowability of rubber compound mixing, and prevent the agglomeration of inorganic flame retardant fillers.

[0074] (7) Anti-aging stabilizers: natural rosin modified phenolic antioxidants, plant wax light stabilizers, and bio-based anti-aging system, which inhibit the oxidative breakage of molecular chains during high-temperature processing and long-term use of natural rubber, and extend the service life of the board.

[0075] (8) Coupling modifier: aminosilane coupling agent KH-550, which activates and modifies the surface of halogen-free flame-retardant inorganic powder and graphite conductive filler, enhances the interfacial bonding force between inorganic filler and natural rubber organic matrix, prevents the precipitation and stratification of additives, and ensures long-term stability of anti-slip, antistatic and flame-retardant properties.

[0076] (9) Dispersion and leveling agent: low molecular weight polylactic acid dispersant, biodegradable, promotes the uniform dispersion of conductive fillers and flame retardant powders in the rubber matrix and eliminates local agglomeration defects in the mixing process.

[0077] The integrated preparation method includes:

[0078] S1, Raw material premixing and pretreatment: Weigh all solid powder additives according to the weight ratio, put them into a closed low-speed premixer, and stir and premix at room temperature for 8-15 minutes to achieve uniform predisposition of conductive fillers, halogen-free flame retardants, reinforcing fillers, and various processing aids, reducing the pressure of subsequent mixing and dispersion in the internal mixer; the premixing process is carried out in a closed negative pressure dust collection system, with no dust overflow, reducing material loss.

[0079] S2, One-Step Closed Synchronous Mixing: Natural raw rubber is fed into a pressure mixer with a rotor speed of 30-45 r / min and an initial mixing chamber temperature of 65-75℃. The rubber is first plasticized for 2-4 minutes until it is completely softened and wraps around the rollers. All premixed powder additives prepared in S1 are added at once, and the mixing is carried out in stages with increasing temperature: the first stage is a constant temperature of 75-85℃ for 5-8 minutes, and the second stage is heated to 95-110℃ for 3-6 minutes. The mixing chamber is closed throughout the process, and a waste gas condensation and recovery device is used to collect a small amount of volatile organic components. The final temperature of the rubber compound is controlled to be ≤115℃. The rubber is discharged and cooled to below 40℃ with water to obtain an integrated composite modified rubber compound. This step completes the plasticizing of natural rubber, dispersion of antistatic fillers, uniform doping of halogen-free flame retardants, and pre-dispersion of crosslinking aids in one step, requiring only a single mixing process, eliminating the traditional two-stage or three-stage batch mixing process.

[0080] S3, Rubber compound static curing: After internal mixing, the cooled rubber compound is cut into standard rubber strips and allowed to stand and cure at room temperature in a dark, sealed environment for 12-24 hours. This eliminates the internal shear stress of the rubber compound during the internal mixing process, improves the fluidity of the rubber compound in subsequent molding, and avoids defects such as bubbles, material shortages, and incomplete filling of anti-slip texture during molding.

[0081] S4, Mold Pretreatment: An integrated anti-slip textured molding mold is selected. The mold includes an upper mold, a lower mold, and a positioning and locking mechanism. The inner surface of the upper mold is integrally engraved with a grid-like anti-slip embossed pattern with a embossed height of 0.8-1.5mm and a embossed spacing of 3-6mm. The lower mold is set with a flat base material cavity, and the total thickness of the mold cavity corresponds to the thickness of the finished rubber sheet of 2-8mm. Before molding, the inner wall of the mold is evenly sprayed with a water-based silicone release agent. The mold is preheated in an oven to 130-140℃ and kept warm until use.

[0082] S5, Molding and Positioning of Rubber Material: Lay the cured standard rubber strip flat inside the preheated mold cavity, ensuring the rubber material completely covers the cavity, leaving a 5% to 8% margin for overflow. Close and lock the mold, pre-adjusting the locking pressure to 3 to 5 MPa to complete the molding and positioning process.

[0083] S6, Synchronous Compression Vulcanization + Anti-slip Texture Integrated Molding: The mold with the mold clamped is sent into a flat vulcanizing machine, and compression vulcanization is carried out in stages with heating and pressure, divided into a heating section, a constant temperature vulcanization section, and a slow cooling and shaping section; the pressure in the heating section is 8-12MPa, the heating rate is 2℃ / min, and the temperature is raised to 145-155℃; the constant temperature vulcanization section maintains the temperature at 145-155℃ and the pressure at 8-12MPa, and the constant temperature and pressure vulcanization is carried out for 12-22min; during the vulcanization process, the molten rubber melt fills all the cavities of the upper mold anti-slip texture molding module under the action of pressure, and the rubber molecular chains undergo cross-linking reaction simultaneously. The substrate of the sheet and the surface anti-slip texture are simultaneously cured and cross-linked into an integral structure; in the slow cooling and shaping section, the heating system is turned off, the mold is clamped at a low pressure of 3-5MPa, and it is naturally cooled to below 60℃.

[0084] S7, Demolding and Plate Removal: After the mold temperature drops to 60℃, the mold is unlocked and opened to completely remove the integrated molded rubber plate semi-finished product. The overflow material from the edges is collected, crushed and recycled, and reused in the S2 mixing process to achieve zero material waste.

[0085] S8, Finishing after finishing: Cut off irregular overflow edges of the board, place at room temperature and ventilate for 4-8 hours to release trace small volatile sulfide residues, test the thickness, surface anti-slip friction coefficient, surface electrostatic resistivity, flame retardancy rating, and tensile strength. Qualified products are cut to standard size and put into storage; unqualified products are all crushed, recycled and re-mixed, with no solid waste discarded.

[0086] S9, Performance Re-inspection and Classification Storage: After processing, the finished products are sampled in batches for mechanical, antistatic, flame retardant and anti-slip properties testing. They are then classified and stored according to thickness, specifications and performance parameters to complete the entire preparation process.

[0087] The integrated preparation method in this embodiment adopts the following innovative mechanism:

[0088] 1. One-step synchronous internal mixing mechanism: All environmentally friendly conductive, halogen-free flame retardant, and reinforcing additives are premixed and added to the internal mixer at once. The mixing is carried out in stages at low temperature and under control. The compatibility between inorganic powder and natural rubber is enhanced by silane coupling agents and bio-based dispersing agents. A single mixing process can achieve nanoscale uniform dispersion of multiple functional additives. There is no need to prepare antistatic masterbatch and flame retardant masterbatch separately. This reduces one or more high-temperature mixing and heating cycles, and reduces the heat consumption of a single batch of production by more than 30%. The closed mixing process is equipped with a waste gas recovery device, which reduces organic waste gas emissions by 65%, meeting the requirements for energy-saving and environmentally friendly production.

[0089] 2. Molding and Simultaneous Anti-slip Texture Forming Mechanism: In traditional processes, secondary embossing after vulcanizing the substrate only involves plastic deformation of the rubber surface without molecular cross-linking. In this invention, the rubber melt has high fluidity during the vulcanization heating stage, and completely fills the upper mold anti-slip texture cavity under molding pressure. The vulcanization cross-linking reaction occurs simultaneously in the substrate and inside the anti-slip texture. The rubber molecular chains of the texture and the substrate interpenetrate and cross-link with each other, without a layered interface. The bonding strength at the root of the anti-slip texture is equal to that of the rubber body, and the wear resistance and service life are increased by more than double.

[0090] 3. Multi-performance synergistic balance mechanism: The bio-based composite low-filler conductive filler and the ternary halogen-free low-filler flame-retardant compound system are compatible with each other and will not agglomerate or antagonize each other; natural rubber serves as a continuous elastic matrix, and silica reinforcement simultaneously improves the anti-slip friction coefficient. The functional components do not cancel each other out, and the finished sheet simultaneously and stably possesses: a dry static friction coefficient ≥0.75 (anti-slip) and a surface resistivity of 10⁻⁶. 6 ~10 9 It has an anti-static coating, is UL94V0 grade halogen-free flame retardant, has a tensile strength ≥18MPa, an elongation at break ≥550%, and all additives are renewable, halogen-free, and low VOC, meeting the standards for green new materials.

[0091] This invention sets up two sets of industrial mass production application examples and simultaneously sets up a comparative example to compare and verify the differences between the integrated process of this invention and the traditional multi-stage process in terms of energy consumption, product performance, and environmental protection indicators. The raw material ratios and process parameters of each example include clearly quantified values, and the performance testing adopts national standard testing methods.

[0092] Application Example 1: 3mm Thin Laboratory Antistatic, Anti-slip, Flame-retardant Natural Rubber Sheet

[0093] 1. Raw material weight ratio (based on 100 parts natural raw rubber)

[0094] 100 parts of SCR5 natural raw rubber;

[0095] Environmentally friendly composite conductive filler: 13 parts modified graphite micro flakes, 5 parts lignin sulfonate conductive powder, totaling 18 parts;

[0096] Compound halogen-free flame retardant system: 36 parts of ultrafine magnesium hydroxide, 13 parts of MCA melamine cyanurate, 6 parts of methyl silicone resin micro powder, totaling 55 parts;

[0097] 22 parts of reinforcing filler silica;

[0098] Vulcanization crosslinking system: 1.2 parts sulfur, 2.4 parts CBS accelerator, 1.3 parts zinc oxide, totaling 4.9 parts;

[0099] Palm oil stearate lubricant 2.8 parts, natural rosin phenolic antioxidant 2.0 parts, KH-550 silane coupling agent 1.8 parts, polylactic acid dispersant 1.2 parts.

[0100] 2. Integrated preparation with stepwise quantitative process parameters

[0101] S1 Raw Material Premixing: All powdered additives are put into a closed premixer, stirred at room temperature for 12 minutes, stirring speed 200r / min, and dust is removed under closed negative pressure.

[0102] S2, one-step internal mixing: internal mixer rotor speed 38r / min, initial chamber temperature 70℃, natural rubber is plasticized separately for 3min; premixed powder is added at one time, first stage constant temperature 80℃ mixing for 6min, second stage temperature rise to 102℃ mixing for 4min; discharge temperature 112℃, circulating water cooling to 36℃ for discharge.

[0103] S3, Rubber compound curing: Seal and keep in the dark for 18 hours.

[0104] S4, Mold pretreatment: The target thickness of the finished sheet is 3mm, the height of the anti-slip embossed pattern on the upper mold is 1.0mm, and the spacing between the embossed patterns is 4mm; the mold is preheated to 135℃ and sprayed with water-based release agent for heat preservation.

[0105] S5, mold positioning: the rubber strip fills the cavity, the overflow is reserved at 7%, and the pre-locking pressure is 4MPa.

[0106] S6, integrated molding and vulcanization: the pressure of the heating section of the flat vulcanizing machine is 10MPa, and the heating rate is 2℃ / min to reach 150℃; the constant temperature vulcanization section is 150℃ and 10MPa pressure is held for 16min; the slow cooling section has a mold clamping pressure of 4MPa and is naturally cooled to 58℃.

[0107] S7: Demolding and scrap material are all recycled and reused.

[0108] S8, finished product sorting and ventilation for 6 hours, cut standard 1200mm×1000mm laboratory mat.

[0109] S9, batch sampling performance testing and warehousing.

[0110] 3. Finished product testing indicators (national standard test)

[0111] (1) Anti-slip performance: GB / T40223-2021, dry static friction coefficient 0.82, wet static friction coefficient 0.71;

[0112] (2) Antistatic properties: GB / T2411-2008, average surface resistivity 3.2×10 7 Ω, stably settled at 10 6 ~10 9 Ω anti-static zone;

[0113] (3) Flame retardant performance: UL94 vertical burning test, V0 grade, no melt dripping, smoke production grade s1 low smoke;

[0114] (4) Mechanical properties: tensile strength 19.2 MPa, elongation at break 586%, tear strength 42 kN / m;

[0115] (5) Environmental protection indicators: GB38508-2020, bromine and chlorohalides were not detected, and VOC emission was 23 μg / g;

[0116] (6) Comparison of production energy consumption: The unit finished product comprehensive energy consumption is reduced by 36% compared with the traditional segmented process, and the organic waste gas emission is reduced by 68%.

[0117] Application Example 2: 6mm Thick Industrial Anti-slip, Anti-static, and Flame-retardant Rubber Sheet for Power Distribution Rooms

[0118] 1. Raw material weight ratio (based on 100 parts natural raw rubber)

[0119] 100 parts of SCR5 natural raw rubber;

[0120] Environmentally friendly composite conductive filler: 18 parts modified graphite micro flakes, 7 parts lignin sulfonate conductive powder, totaling 25 parts;

[0121] Compound halogen-free flame retardant system: 40 parts of ultrafine magnesium hydroxide, 15 parts of MCA melamine cyanurate, 6 parts of methyl silicone resin micro powder, totaling 61 parts;

[0122] 27 parts of reinforcing filler silica;

[0123] Vulcanization crosslinking system: 1.4 parts sulfur, 2.9 parts CBS accelerator, 1.5 parts zinc oxide, totaling 5.8 parts;

[0124] Palm oil stearate lubricant 3.6 parts, natural rosin phenolic antioxidant 2.6 parts, KH-550 silane coupling agent 2.2 parts, polylactic acid dispersant 1.6 parts.

[0125] 2. Integrated preparation with stepwise quantitative process parameters

[0126] S1, Raw material premixing: Powder additives are premixed in a closed system for 14 minutes at a speed of 200 r / min and under negative pressure dust collection.

[0127] S2, one-step internal mixing: rotor speed 42r / min, initial cavity temperature 72℃, rubber plasticizing for 3.5min; premixed powder is added, first stage mixing at 83℃ for 7min, second stage mixing at 108℃ for 5min; discharge temperature 114℃, water cooling to 38℃.

[0128] S3, Rubber compound curing: Seal and let stand for 22 hours.

[0129] S4, Mold pretreatment: Finished sheet thickness 6mm, upper mold dot anti-slip embossed height 1.3mm, embossed spacing 5mm; mold preheated to 138℃.

[0130] S5, mold positioning: 8% overflow allowance, pre-locking pressure 4.5MPa.

[0131] S6, integrated molding and vulcanization: heating section pressure 11MPa, heating to 152℃; constant temperature vulcanization 152℃, 11MPa pressure holding for 20min; slow cooling mold locking pressure 4.5MPa, cooling to 55℃ and mold opening.

[0132] S7, demolding, all overflowing material and corners are crushed and recycled.

[0133] S8, finished product ventilated and left to stand for 7 hours, then cut standard roll material for the power distribution room.

[0134] S9, sampling performance testing, classified warehousing.

[0135] 3. Finished product testing indicators (national standard test)

[0136] (1) Anti-slip performance: dry static friction coefficient 0.78, wet static friction coefficient 0.68;

[0137] (2) Antistatic properties: Average surface resistivity 8.6×10 6 Ω, which meets the standards for industrial anti-static high-voltage power distribution rooms;

[0138] (3) Flame retardant performance: UL94V0 grade, no corrosive smoke release during high-temperature combustion;

[0139] (4) Mechanical properties: tensile strength 18.5MPa, elongation at break 562%, excellent wear resistance, and the anti-slip texture does not fall off after 8000 cycles of reciprocating friction;

[0140] (5) Environmental indicators: No halogens detected, VOC release 27μg / g;

[0141] (6) Production energy consumption: Compared with traditional multi-process technology, the overall energy consumption is reduced by 39%, and there is no industrial solid waste discharge.

[0142] Comparison of traditional segmented multi-process anti-slip, anti-static, and flame-retardant rubber sheets

[0143] 1. Traditional process route: natural rubber is mixed in two stages to prepare base masterbatch → carbon black antistatic masterbatch is mixed separately → bromine-based flame retardant masterbatch is mixed separately → three-stage compound mixing of rubber compounds → smooth panel vulcanization molding → secondary molding and rolling to create anti-slip texture; the flame retardant additive is decabromodiphenyl ether halogen-based flame retardant, and the conductive filler is highly filled conductive carbon black.

[0144] 2. Performance and Energy Consumption Comparison: The energy consumption per unit product is approximately 55% higher than that of Examples 1 and 2; bromide was detected in the combustion test of the finished product, and the VOC emission was 126 μg / g; the dry friction coefficient is only 0.61, and the anti-slip texture peels off after 3200 consecutive rubbing cycles; the surface resistivity fluctuates within a range of 10. 5 ~10¹ 0 Ω, with unstable antistatic properties; tensile strength of 14.3MPa, elongation at break of 412%, and mechanical properties significantly inferior to the two application embodiments of the present invention.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated preparation method for a natural rubber anti-slip, anti-static, and flame-retardant sheet, characterized in that, The integrated anti-slip texture molding process employs a one-step synchronous mixing and single-compression synchronous vulcanization method, which includes only one closed mixing and one compression vulcanization, without secondary mixing, secondary vulcanization, or post-processing embossing. During the mixing stage, natural rubber base material, environmentally friendly composite conductive filler, compounded halogen-free flame retardant system, and rubber basic processing aids are added simultaneously. Low-temperature segmented mixing in a closed environment inhibits the volatilization of aids. The single-compression synchronous vulcanization process for integrated anti-slip texture molding is equipped with an integrated mold with a built-in anti-slip texture molding module. The upper and lower molds of the integrated mold are respectively set with anti-slip concave and convex texture molding structures. During the compression heating and vulcanization process, the rubber melt is simultaneously cross-linked and solidified, filling the texture cavity. The molecular chains of the sheet matrix and the surface anti-slip texture are cross-linked into one, and the finished anti-slip, anti-static, and flame-retardant rubber sheet is produced by a single compression molding. The raw materials of the integrated preparation method, by weight, include: 100 parts of natural raw rubber as the main natural rubber substrate, 12-28 parts of environmentally friendly composite conductive filler, the compounded halogen-free flame retardant system, and the rubber basic processing aids. The rubber basic processing aids include the environmentally friendly composite conductive filler, the compounded halogen-free flame retardant system, reinforcing fillers, vulcanization crosslinking system powder components, processing lubricants, anti-aging stabilizers, coupling modifiers, and dispersion and leveling agents. The environmentally friendly composite conductive filler is a compound system of modified graphite microflakes and lignin sulfonate modified potassium salt powder. The compounded halogen-free flame retardant system is a ternary compound of ultrafine magnesium hydroxide, melamine cyanurate, and methyl silicone resin micropowder, without the addition of halogenated flame retardant additives or heavy metal conductive fillers throughout the entire process. The integrated preparation method includes: S1, raw material premixing and pretreatment; S2, one-step closed synchronous intensive mixing; S3, rubber compound is left to mature under static conditions; S4, mold pretreatment; S5, positioning of the rubber material in the mold; S6, synchronous molding vulcanization and anti-slip texture are integrally formed; S7, demold and remove plate; S8, finishing touches; S9, performance re-inspection and classified storage.

2. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 1, characterized in that, S1 includes: S11, weigh all the solid powder of the rubber-based processing aid according to weight parts and put it into a closed low-speed premixer; wherein, the compound halogen-free flame retardant system is 45-65 parts, the reinforcing filler is 15-30 parts, the vulcanization crosslinking system powder combination is 3.2-6.5 parts, the processing lubricant is 2.0-4.8 parts, the anti-aging stabilizer is 1.2-3.0 parts, the coupling modifier is 1.0-2.6 parts, and the dispersion and leveling aid is 0.5-1.8 parts; S12, room temperature stirring and premixing for 8-15 minutes, the premixing process is equipped with a closed negative pressure dust collection device, and after stirring, a uniform pre-dispersed powder mixture is obtained.

3. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 2, characterized in that, S2 includes: S21, put natural raw rubber into a pressure mixer, with a rotor speed of 30-45 r / min and an initial temperature of 65-75℃ in the mixing chamber, and plasticize it separately for 2-4 minutes until the natural rubber is completely softened and wraps around the rollers; S22, add the uniformly pre-dispersed powder mixture at once, and mix it in two stages at a constant temperature: the first stage is at a constant temperature of 75-85℃ for 5-8 minutes, and the second stage is heated to 95-110℃ and mixed at a constant temperature for 3-6 minutes. S23, the internal mixer is fully enclosed and equipped with a waste gas condensation and recovery device. The temperature of the rubber compound at the end of the mixing process is controlled to be ≤115℃. After the rubber is discharged, it is cooled down to below 40℃ by water cooling to obtain an integrated composite modified rubber compound.

4. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 3, characterized in that, The S3 rubber compound static curing process includes: cutting the cooled integrated composite modified rubber compound into standard rubber strips of uniform specifications, placing them in a light-proof and sealed storage environment at room temperature for static curing for 12 to 24 hours to obtain the cured standard rubber strips, eliminating the internal stress of the rubber compound during internal mixing and improving the fluidity of subsequent molding.

5. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 4, characterized in that, The S4 mold pretreatment includes: S41, Prepare an integrated anti-slip texture molding die. The integrated anti-slip texture molding die consists of an upper die, a lower die, and a locking and positioning mechanism. The inner surface of the upper die is integrally engraved with anti-slip raised patterns. The height of the anti-slip raised patterns is 0.8 to 1.5 mm, and the spacing between the raised patterns is 3 to 6 mm. S42, Before molding, water-based silicone-based environmentally friendly release agent is evenly sprayed onto the inner wall of the cavity of the integrated anti-slip texture molding mold. The entire set of integrated anti-slip texture molding molds is then placed in a preheating oven and preheated to 130-140℃ for later use.

6. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 5, characterized in that, The S5 rubber compound molding positioning includes: S51, Take out the cured standard rubber strip and lay it flat on the preheated integrated anti-slip texture molding die; S52, The adhesive material is laid to completely cover the internal area of ​​the cavity of the lower mold, with a 5% to 8% overflow allowance. S53, close the upper and lower molds, and pre-pressurize the mold locking mechanism with 3-5 MPa to complete the positioning and mold locking.

7. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 6, characterized in that, The S6 synchronous molding vulcanization and anti-slip texture integral molding includes: S61, the mold that has completed the positioning and locking process is sent into the flat vulcanizing machine; S62 is a three-stage temperature and pressure controlled processing method; wherein the three stages include: First heating stage: clamping pressure 8-12MPa, heating rate 2℃ / min, heating to vulcanization constant temperature 145-155℃; Second constant temperature vulcanization section: maintain temperature at 145-155℃ and pressure at 8-12MPa, hold pressure for vulcanization for 12-22min, the molten rubber melt completely fills the cavity of the upper mold anti-slip texture module under pressure, and the rubber matrix and anti-slip texture cross-link and solidify simultaneously. The third slow cooling and shaping stage: the heating system is turned off, the mold clamping pressure is reduced to 3-5 MPa for low-pressure heat preservation, and the mold is naturally cooled to below 60°C.

8. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 7, characterized in that, The S7 demolding plate includes: S71, after the mold temperature drops below 60℃, the mold is unlocked and opened to completely remove the integrated molded rubber sheet semi-finished product; S72, trim the excess material from the edge of the board, crush and pulverize all the scraps, and return them to the one-step closed synchronous mixing process in S2 for recycling, achieving zero waste of production materials.

9. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 8, characterized in that, The finishing process of the S8 finished product includes: S81, remove irregular overflow and burrs from the edge of the rubber sheet, and place the cleaned sheet in a room temperature and ventilated environment for 4 to 8 hours to release trace amounts of residual small molecule volatiles from the vulcanization. S82, after standing, sample and test the basic physical and chemical properties of the board thickness, dry friction coefficient, surface electrostatic resistivity, vertical flame retardancy rating and tensile strength. Boards that pass the initial screening are uniformly cut to the standard size required by the customer, and unqualified products are all crushed and recycled.

10. The integrated preparation method of a natural rubber anti-slip, anti-static, and flame-retardant sheet according to claim 9, characterized in that, The S9 performance re-inspection and classification warehousing includes: S91, randomly sample the boards that pass the initial screening in batches for a full set of re-inspections on anti-slip, anti-static, flame retardant and mechanical properties; S92 stipulates that products that pass the re-inspection are classified and stored in sealed warehouses according to the thickness of the sheet, the specifications of the finished product, and the applicable scenarios; products that fail the re-inspection are crushed and returned to the mixing process for reprocessing.

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