A double-layer rubber and plastic sheet with heat insulation and noise reduction functions

Abstract

This invention relates to the field of sheet technology and discloses a double-layer rubber-plastic sheet with heat insulation and noise reduction functions. This double-layer rubber-plastic sheet includes a surface layer and an inner layer. By adding fiber functional additives to the surface layer material, the aerogel structure of the fiber functional additives provides heat shielding and reflects sound waves, resulting in excellent heat insulation and noise reduction. Secondly, the cross-linked tamarind gum contained in the aerogel structure can serve as a carbon source, and the functional bridging agent structure contains nitrogen and phosphorus elements, which can serve as a gas source and an acid source, respectively. When the rubber-plastic sheet burns, an expanding carbon layer can be rapidly formed on the surface layer, preventing combustion from continuing and effectively improving the flame retardant properties of the rubber-plastic sheet. Furthermore, quartz fibers can efficiently exert their reinforcing effect, improving the mechanical strength of the sheet, thus giving the prepared rubber-plastic sheet excellent comprehensive performance.

Description

Technical Field

[0001] This invention relates to the field of sheet technology, specifically to a double-layer rubber and plastic sheet with heat insulation and noise reduction functions. Background Technology

[0002] Rubber-plastic composite (RPC) sheets are closed-cell elastic materials made primarily from synthetic rubber or plastics, with the addition of various additives, through high-temperature mixing, extrusion, or compression molding processes. Due to their lightweight, flexibility, corrosion resistance, and ease of installation, they are widely used in construction, transportation, and industrial equipment. With the escalating energy crisis and increased environmental awareness, the technological evolution of RPC sheets is increasingly focused on functional integration. Traditional single-performance RPC sheets can no longer meet the comprehensive demands of modern engineering for safety, energy conservation, and comfort. The integration of flame-retardant, heat-insulating, and noise-reducing functions has become a core objective for industry technological upgrades.

[0003] Currently, the functional modifications of rubber sheets, such as flame retardancy and heat insulation, are generally achieved by adding inorganic additives, such as magnesium hydroxide and hollow glass microspheres, to the rubber formulation. However, the compatibility between inorganic additives and the rubber substrate is problematic, making it difficult to achieve uniform dispersion. Therefore, a large amount of additive is required to produce a significant modification effect, which has a serious negative impact on the mechanical strength of rubber-plastic sheets. Based on this, the present invention provides a rubber-plastic sheet that can solve the problems existing in the prior art. Summary of the Invention

[0004] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide a double-layer rubber and plastic sheet with heat preservation and noise reduction functions.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A double-layer rubber and plastic sheet with heat insulation and noise reduction functions, comprising a surface layer and an inner layer;

[0007] The surface layer is made from the following raw materials in parts by weight:

[0008] 25-35 parts natural rubber, 5-10 parts styrene-butadiene rubber, 10-20 parts polyvinyl chloride, 1-2.5 parts fiber functional additives, 5-10 parts carbon black, 0.5-1.5 parts antioxidant, 10-20 parts foaming agent, 3-8 parts dispersant, 3-5 parts vulcanizing agent, and 1-2 parts vulcanizing auxiliaries;

[0009] The inner layer is made from the following raw materials in parts by weight:

[0010] 25-40 parts butadiene rubber, 12-18 parts polyvinyl chloride, 10-15 parts foaming agent, 1-3 parts lubricant, 0.5-1.5 parts antioxidant, 5-10 parts carbon black, 1-3 parts stabilizer, 1-2 parts dispersant, 3-5 parts vulcanizing agent, and 1-2 parts vulcanizing aid.

[0011] As a further aspect of the present invention, the method for preparing the double-layer rubber-plastic sheet includes the following steps:

[0012] Step 1: Weigh each ingredient in the surface layer according to the specified weight proportions. Then, add natural rubber, styrene-butadiene rubber, polyvinyl chloride, fiber functional additives, carbon black, antioxidant, foaming agent, and dispersant to a mixer and mix at 140-160℃. Discharge the rubber and pour it into a two-roll mill. Pass the mill through a thin sheet 2-3 times to control the thickness to 5-10mm. Then, continue to feed the sheet into the two-roll mill. After hot pressing and rolling, add vulcanizing agent and vulcanizing aid. After mixing, automatically turn the sheet over and discharge it after 200-300 seconds to form the surface layer rubber strip.

[0013] The second step is to weigh each raw material in the inner layer according to the weight proportions, and then add butadiene rubber, polyvinyl chloride, foaming agent, lubricant, antioxidant, carbon black, stabilizer and dispersant into the internal mixer and mix them. The mixture is discharged at 145-150℃. Then, it is placed in the open mill and thin-passed 2-3 times to produce sheets with a thickness of 5-10mm. Then, it is transferred to the open mill for a second mixing. After pressing and wrapping the rolls, vulcanizing agent and vulcanizing aid are added. After stirring, the material is automatically turned over and discharged after 200-300s to form the inner layer rubber strip.

[0014] The third step is to feed the surface layer rubber strip and the inner layer rubber strip into two extruders respectively, and extrude them through the same die head. The extrusion temperature is controlled at 40-50℃ and the die head temperature is 50-60℃ to form a semi-finished sheet material.

[0015] Step 4: Place the semi-finished board into an oven with multiple drying tunnels for vulcanization and foaming. Control the temperature of the drying tunnels in sequence as follows: Section 1 125±5℃, Section 2 130±5℃, Section 3 140±5℃, Section 4 150±5℃, Section 5 160±5℃, and Section 6 170±5℃. After foaming, cool the board to obtain double-layer rubber and plastic board.

[0016] As a further aspect of the present invention, the method for preparing the fiber functional additive includes the following steps:

[0017] Step S1: Add quartz fiber to toluene and disperse it evenly. Then add surface modifier and catalyst to the resulting dispersion. After the addition is complete, turn on the heater and gradually raise the temperature to 70-80℃. Continue stirring for 4-8 hours, then stop the heating and discharge the material to obtain organic modified quartz fiber.

[0018] Step S2: Add the organically modified quartz fiber to a 1:1 volume ratio mixture of ethanol and purified water. After the addition is complete, disperse until a uniform dispersion is formed. Then, add tamarind gum and an alkaline hydroxide aqueous solution. After the addition is complete, raise the temperature to 60-70℃ and keep it at that temperature for 2-4 hours. Then, add the functional bridging agent. After the addition is complete, raise the temperature further to 70-80℃ and stir continuously for 6-9 hours. Then, stop heating and let it cool. Pour it into a mold, let it stand to form a gel, and transfer it to a freeze dryer for freeze drying to obtain the fiber functional additive.

[0019] As a further aspect of the present invention, in step S1, the surface modifier is chloroethyl isocyanate or 3-chloropropyl isocyanate.

[0020] As a further aspect of the present invention, in step S1, the catalyst is any one of octyl thiotin, dibutyltin dilaurate, stannous octoate, or dibutyltin diacetate.

[0021] As a further aspect of the present invention, in step S2, the alkaline hydroxide aqueous solution is a potassium hydroxide aqueous solution or a sodium hydroxide aqueous solution, with a mass fraction of 10-20%.

[0022] As a further aspect of the present invention, in step S2, the preparation method of the functional bridging agent is as follows:

[0023] 5-Bromopyrimidine-2-carboxylic acid and tetrahydrofuran were added to a reaction vessel and stirred. After a homogeneous mixture was formed, nitrogen gas was introduced for protection. Then, a condensing agent and an accelerator were added. After stirring at room temperature for 20-40 minutes, bis(2-hydroxyethyl) ester of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphoric acid hexane-6-yl)methyl]succinic acid was added to the reaction vessel. After the addition was complete, the temperature was raised to 40-50℃ and maintained for 3-6 hours. The solvent was then evaporated and the product was collected to obtain the functional bridging agent.

[0024] As a further embodiment of the present invention, the molar ratio of 5-bromopyrimidine-2-carboxylic acid and [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphazenecyclo-6-yl)methyl]succinic acid bis(2-hydroxyethyl) ester is 2:1.

[0025] As a further embodiment of the present invention, the condensing agent is dicyclohexylcarbodiimide or 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide; the accelerator is 4-dimethylaminopyridine or N-hydroxysuccinimide.

[0026] In the above technical solution, firstly, a surface modifier is used to modify the surface of quartz fiber, and halogen substituents are modified on the surface of quartz fiber to obtain organic modified quartz fiber. Then, under the catalysis of alkaline hydroxide, the halogen substituents can further replace the hydroxyl groups in the tamarind gum structure, thereby modifying the tamarind gum molecular chain on the surface of quartz fiber. At the same time, a functional bridging agent containing two equivalent halogen substituents in the structure is added to crosslink the tamarind gum molecular chain, thereby tightly coating the surface of quartz fiber with crosslinked tamarind gum. Then, through a freeze-drying process, the crosslinked tamarind gum is converted into an aerogel state to obtain a fiber functional additive.

[0027] The functional bridging agent is prepared by reacting 5-bromopyrimidine-2-carboxylic acid and [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphazenecyclo-6-yl)methyl]succinic acid bis(2-hydroxyethyl) ester with active carboxyl and hydroxy substituents in their structures under the combined action of condensing agent and accelerator. By controlling the ratio of the two, the structure of the prepared functional bridging agent can contain two equivalent halogen substituents.

[0028] As a further embodiment of the present invention, the antioxidant is at least one of antioxidant 4020 or antioxidant MBT; the foaming agent is AC foaming agent; the vulcanizing agent is sulfur; the vulcanization aid is at least one of vulcanization accelerator PZ, vulcanization accelerator DPTT or vulcanization accelerator EZ; and the stabilizer is calcium-zinc stabilizer.

[0029] The beneficial effects of this invention are:

[0030] This invention produces a fiber functional additive by coating aerogel onto the surface of quartz fibers, which is then used as a surface layer additive for double-layer rubber-plastic sheets. Firstly, the aerogel's rich pore structure provides excellent heat insulation; the abundant pore walls create an "infinitely long, loose path" effect. Simultaneously, the pores reflect sound waves, gradually attenuating sound energy and resulting in good heat insulation and noise reduction. Secondly, the cross-linked tamarind gum in the aerogel structure serves as a carbon source, while the functional bridging agent contains nitrogen and phosphorus elements, which can act as a gas source and an acid source, respectively. When the rubber-plastic sheet burns, an expanding carbon layer quickly forms on the surface, preventing sustained combustion and effectively improving the flame-retardant properties of the sheet. Furthermore, the quartz fibers provide skeletal support for the aerogel, preventing pore collapse. After surface modification, the quartz fibers can also create a good interfacial interaction with the rubber-plastic matrix, maximizing their reinforcing effect and improving the mechanical strength of the sheet.

[0031] This invention reduces the amount of expensive natural rubber used through a double-layer design, effectively saving production costs and facilitating its widespread use.

[0032] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0034] Preparation Example

[0035] Preparation of fiber functional additives:

[0036] Step 1: Add 1.2g of quartz fiber to toluene and disperse it evenly. Then add 0.8g of chloroethyl isocyanate and 0.01g of dibutyltin dilaurate to the resulting dispersion. After the addition is complete, turn on the heater and gradually raise the temperature to 75℃. After stirring continuously for 6 hours, stop the heating and discharge the material to obtain organic modified quartz fiber.

[0037] Step 2: Add 0.19g of 5-bromopyrimidine-2-carboxylic acid and tetrahydrofuran to the reaction vessel, start stirring, and after a homogeneous mixture is formed, purge with nitrogen for protection. Then add 0.1g of dicyclohexylcarbodiimide and 0.04g of 4-dimethylaminopyridine. Stir at room temperature for 30min, and then add 0.2g of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphazenecyclo-6-yl)methyl]bis(2-hydroxyethyl) succinate to the reaction vessel. After the addition is complete, raise the temperature to 45℃ and keep it at that temperature for 4h. Then evaporate to remove the solvent and collect the product to obtain the functional bridging agent.

[0038] Step 3: Add 0.8g of organically modified quartz fiber to a 1:1 volume ratio mixture of ethanol and purified water. After the addition is complete, disperse until a uniform dispersion is formed. Then, add 3.5g of tamarind gum and 10mL of 15% sodium hydroxide aqueous solution. After the addition is complete, raise the temperature to 65℃ and keep it at that temperature for 3 hours. Then, add 0.5g of functional bridging agent. After the addition is complete, raise the temperature further to 75℃ and stir continuously for 8 hours. Then, stop heating and let it cool. Pour the mixture into a mold, let it stand to form a gel, and transfer it to a freeze dryer for freeze drying to obtain the fiber functional additive.

[0039] Example 1

[0040] A double-layer rubber and plastic sheet with heat insulation and noise reduction functions, comprising a surface layer and an inner layer;

[0041] The surface layer is made from the following raw materials in parts by weight:

[0042] 25 parts natural rubber, 5 parts styrene-butadiene rubber, 10 parts polyvinyl chloride, 1 part fiber functional additive, 5 parts carbon black, 0.5 parts antioxidant 4020, 10 parts AC foaming agent, 3 parts saturated fatty acid zinc salt dispersant LP623A dispersant, 3 parts vulcanizing agent sulfur, 1 part vulcanization accelerator PZ.

[0043] The inner layer is made from the following raw materials in parts by weight:

[0044] 25 parts butadiene rubber, 12 parts polyvinyl chloride, 10 parts AC foaming agent, 1 part lubricant, 0.5 parts antioxidant 4020, 5 parts carbon black, 1 part calcium zinc stabilizer, 1 part saturated fatty acid zinc salt dispersant LP623A dispersant, 3 parts sulfur, 1 part vulcanization accelerator PZ.

[0045] The preparation method of the double-layer rubber and plastic sheet includes the following steps:

[0046] Step 1: Weigh each ingredient in the surface layer according to the specified weight proportions. Then, add natural rubber, styrene-butadiene rubber, polyvinyl chloride, fiber functional additives, carbon black, antioxidant 4020, AC foaming agent, and saturated fatty acid zinc salt dispersant LP623A into a mixing mill and mix to 140°C. Discharge the rubber and pour it into a two-roll mill. Pass the mill through two thin passes to produce sheets with a thickness of 10mm. Then, continue to feed the sheets into the two-roll mill. After hot pressing and rolling, add sulfur and vulcanization accelerator PZ. After mixing, automatically turn the sheets over and discharge them after 300 seconds to form the surface layer rubber strips.

[0047] The second step is to weigh each raw material in the inner layer according to the weight proportions, and then add butadiene rubber, polyvinyl chloride, AC foaming agent, lubricant, antioxidant 4020, carbon black, calcium zinc stabilizer and saturated fatty acid zinc salt dispersant LP623A into the internal mixer for internal mixing. The material is discharged at 145°C. Then it is placed in the open mill and thin-passed twice to produce sheets with a thickness of 10mm. Then it is transferred to the open mill for a second open mill. After pressing and wrapping the hot rollers, sulfur and vulcanization accelerator PZ are added. After stirring, the material is automatically turned over and discharged after 300s to form the inner layer rubber strip.

[0048] The third step is to feed the surface layer rubber strip and the inner layer rubber strip into two extruders respectively, and extrude them through the same die head. The extrusion temperature is controlled at 40℃ and the die head temperature is 50℃ to form a semi-finished sheet material.

[0049] Step 4: Place the semi-finished board into an oven with multiple drying tunnels for vulcanization and foaming. Control the temperature of the drying tunnels in sequence as follows: Section 1 125±5℃, Section 2 130±5℃, Section 3 140±5℃, Section 4 150±5℃, Section 5 160±5℃, and Section 6 170±5℃. After foaming, cool the board to obtain double-layer rubber and plastic board.

[0050] The preparation method of the fiber functional additive is shown in the preparation example, and the same applies to the following.

[0051] Example 2

[0052] A double-layer rubber and plastic sheet with heat insulation and noise reduction functions, comprising a surface layer and an inner layer;

[0053] The surface layer is made from the following raw materials in parts by weight:

[0054] Natural rubber 30 parts, styrene-butadiene rubber 6 parts, polyvinyl chloride 15 parts, fiber functional additive 2 parts, carbon black 6 parts, antioxidant MBT 1 part, AC foaming agent 15 parts, saturated fatty acid zinc salt dispersant LP623A dispersant 4 parts, vulcanizing agent sulfur 4 parts, vulcanization accelerator PZ 1.5 parts;

[0055] The inner layer is made from the following raw materials in parts by weight:

[0056] 30 parts butadiene rubber, 15 parts polyvinyl chloride, 12 parts AC foaming agent, 2 parts lubricant, 1 part antioxidant MBT, 6 parts carbon black, 2 parts calcium zinc stabilizer, 1.5 parts saturated fatty acid zinc salt dispersant LP623A dispersant, 1 part sulfur, and 1.5 parts vulcanization accelerator PZ.

[0057] The preparation method of the double-layer rubber and plastic sheet includes the following steps:

[0058] Step 1: Weigh each ingredient in the surface layer according to the specified weight proportions. Then, add natural rubber, styrene-butadiene rubber, polyvinyl chloride, fiber functional additives, carbon black, antioxidant MBT, AC foaming agent, and saturated fatty acid zinc salt dispersant LP623A into a mixing mill and mix to 150°C. Discharge the rubber and pour it into a two-roll mill. Pass the sheet through the mill twice to control the thickness to 10mm. Then, continue to feed it into the two-roll mill. After hot pressing and rolling, add sulfur and vulcanization accelerator PZ. After mixing, automatically turn the material over and discharge it after 300 seconds to form the surface layer rubber strip.

[0059] The second step is to weigh each raw material in the inner layer according to the weight proportions, and then add butadiene rubber, polyvinyl chloride, AC foaming agent, lubricant, antioxidant 4020, carbon black, calcium zinc stabilizer and saturated fatty acid zinc salt dispersant LP623A into the internal mixer for internal mixing. The material is discharged at 150°C, and then placed in the open mill for thin sheeting twice to control the thickness to 10mm. Then it is transferred to the open mill for secondary mixing, and after pressing and wrapping the rollers, sulfur and vulcanization accelerator PZ are added. After stirring evenly, the material is automatically turned over and discharged after 300s to form the inner layer rubber strip.

[0060] The third step is to feed the surface layer rubber strip and the inner layer rubber strip into two extruders respectively, and extrude them through the same die head. The extrusion temperature is controlled at 50℃ and the die head temperature is 60℃ to form a semi-finished sheet material.

[0061] Step 4: Place the semi-finished board into an oven with multiple drying tunnels for vulcanization and foaming. Control the temperature of the drying tunnels in sequence as follows: Section 1 125±5℃, Section 2 130±5℃, Section 3 140±5℃, Section 4 150±5℃, Section 5 160±5℃, and Section 6 170±5℃. After foaming, cool the board to obtain double-layer rubber and plastic board.

[0062] Example 3

[0063] A double-layer rubber and plastic sheet with heat insulation and noise reduction functions, comprising a surface layer and an inner layer;

[0064] The surface layer is made from the following raw materials in parts by weight:

[0065] Natural rubber 35 parts, styrene-butadiene rubber 10 parts, polyvinyl chloride 20 parts, fiber functional additive 2.5 parts, carbon black 10 parts, antioxidant MBT 1.5 parts, AC foaming agent 20 parts, saturated fatty acid zinc salt dispersant LP623A dispersant 8 parts, vulcanizing agent sulfur 5 parts, vulcanization accelerator PZ 2 parts.

[0066] The inner layer is made from the following raw materials in parts by weight:

[0067] 40 parts butadiene rubber, 18 parts polyvinyl chloride, 15 parts AC foaming agent, 3 parts lubricant, 1.5 parts antioxidant MBT, 10 parts carbon black, 3 parts calcium zinc stabilizer, 2 parts saturated fatty acid zinc salt dispersant LP623A dispersant, 5 parts sulfur, and 2 parts vulcanization accelerator PZ.

[0068] The preparation method of the double-layer rubber and plastic sheet includes the following steps:

[0069] Step 1: Weigh each ingredient in the surface layer according to the specified weight proportions. Then, add natural rubber, styrene-butadiene rubber, polyvinyl chloride, fiber functional additives, carbon black, antioxidant MBT, AC foaming agent, and saturated fatty acid zinc salt dispersant LP623A into a mixing mill and mix to 160°C. Discharge the rubber and then pour it into a two-roll mill. Pass the sheet through the mill twice to control the thickness to 10mm. Then, continue to feed it into the two-roll mill. After hot pressing and rolling, add sulfur and vulcanization accelerator PZ. After mixing, automatically turn the material over and discharge it after 300 seconds to form the surface layer rubber strip.

[0070] The second step is to weigh each raw material in the inner layer according to the weight proportions, and then add butadiene rubber, polyvinyl chloride, AC foaming agent, lubricant, antioxidant 4020, carbon black, calcium zinc stabilizer and saturated fatty acid zinc salt dispersant LP623A into the internal mixer for internal mixing. The material is discharged at 150°C, and then placed in the open mill for thin sheeting twice to control the thickness to 10mm. Then it is transferred to the open mill for secondary mixing, and after pressing and wrapping the rollers, sulfur and vulcanization accelerator PZ are added. After stirring evenly, the material is automatically turned over and discharged after 300s to form the inner layer rubber strip.

[0071] The third step is to feed the surface layer rubber strip and the inner layer rubber strip into two extruders respectively, and extrude them through the same die head. The extrusion temperature is controlled at 50℃ and the die head temperature is 60℃ to form a semi-finished sheet material.

[0072] Step 4: Place the semi-finished board into an oven with multiple drying tunnels for vulcanization and foaming. Control the temperature of the drying tunnels in sequence as follows: Section 1 125±5℃, Section 2 130±5℃, Section 3 140±5℃, Section 4 150±5℃, Section 5 160±5℃, and Section 6 170±5℃. After foaming, cool the board to obtain double-layer rubber and plastic board.

[0073] Comparative Example 1

[0074] A double-layer rubber and plastic board with heat preservation and noise reduction functions is different from Example 2 in that the fiber functional additive is replaced with unmodified quartz fiber, while the rest are the same.

[0075] Comparative Example 2

[0076] A double-layer rubber and plastic sheet with heat insulation and noise reduction functions is different from Example 2 in that the fiber functional additive is removed, but the rest are the same.

[0077] Performance testing

[0078] Sound insulation performance was tested according to standard GB / T 39526-2020;

[0079] Thermal conductivity was tested according to standard GB / T 10294-2008.

[0080] Mechanical strength tests were conducted according to standard GB / T 8813-2020.

[0081] Flame retardant performance was tested according to standard GB 8624-2012;

[0082] The test results are recorded in the table below:

[0083]

[0084] According to the test results, the rubber and plastic sheet in this embodiment of the invention exhibits excellent performance and can meet the industry development requirements for sheet materials.

[0085] After replacing the fiber functional additives with unmodified quartz fibers, the performance of the board material decreased significantly because the board material does not contain an aerogel structure and the quartz fibers have poor dispersibility.

[0086] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

[0087] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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 of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-layer rubber-plastic sheet with heat insulation and noise reduction functions, characterized in that, Includes the outer layer and the inner layer; The surface layer is made from the following raw materials in parts by weight: 25-35 parts natural rubber, 5-10 parts styrene-butadiene rubber, 10-20 parts polyvinyl chloride, 1-2.5 parts fiber functional additives, 5-10 parts carbon black, 0.5-1.5 parts antioxidant, 10-20 parts foaming agent, 3-8 parts dispersant, 3-5 parts vulcanizing agent, and 1-2 parts vulcanizing auxiliaries; The inner layer is made from the following raw materials in parts by weight: 25-40 parts of butadiene rubber, 12-18 parts of polyvinyl chloride, 10-15 parts of foaming agent, 1-3 parts of lubricant, 0.5-1.5 parts of antioxidant, 5-10 parts of carbon black, 1-3 parts of stabilizer, 1-2 parts of dispersant, 3-5 parts of vulcanizing agent, and 1-2 parts of vulcanizing aid; The preparation method of the fiber functional additive includes the following steps: Step S1: Add quartz fiber to toluene and disperse it evenly. Then add surface modifier and catalyst to the resulting dispersion. After the addition is complete, turn on the heater and gradually raise the temperature to 70-80℃. Continue stirring for 4-8 hours, then stop the heating and discharge the material to obtain organic modified quartz fiber. Step S2: Add the organically modified quartz fiber to a 1:1 volume ratio mixture of ethanol and purified water. After the addition is complete, disperse until a uniform dispersion is formed. Then, add tamarind gum and an alkaline hydroxide aqueous solution. After the addition is complete, raise the temperature to 60-70℃ and keep it at that temperature for 2-4 hours. Then, add the functional bridging agent. After the addition is complete, raise the temperature further to 70-80℃ and stir continuously for 6-9 hours. Then, stop heating and let it cool. Pour it into a mold, let it stand to form a gel, and transfer it to a freeze dryer for freeze drying to obtain the fiber functional additive.

2. The double-layer rubber-plastic sheet with heat insulation and noise reduction functions according to claim 1, characterized in that, The preparation method of the double-layer rubber and plastic sheet includes the following steps: Step 1: Weigh each ingredient in the surface layer according to the specified weight proportions. Then, add natural rubber, styrene-butadiene rubber, polyvinyl chloride, fiber functional additives, carbon black, antioxidant, foaming agent, and dispersant to a mixer and mix at 140-160℃. Discharge the rubber and pour it into a two-roll mill. Pass the mill through a thin sheet 2-3 times to control the thickness to 5-10mm. Then, continue to feed the sheet into the two-roll mill. After hot pressing and rolling, add vulcanizing agent and vulcanizing aid. After mixing, automatically turn the sheet over and discharge it after 200-300 seconds to form the surface layer rubber strip. The second step is to weigh each raw material in the inner layer according to the weight proportions, and then add butadiene rubber, polyvinyl chloride, foaming agent, lubricant, antioxidant, carbon black, stabilizer and dispersant into the internal mixer and mix them. The mixture is discharged at 145-150℃. Then, it is placed in the open mill and thin-passed 2-3 times to produce sheets with a thickness of 5-10mm. Then, it is transferred to the open mill for a second mixing. After pressing and wrapping the rolls, vulcanizing agent and vulcanizing aid are added. After stirring, the material is automatically turned over and discharged after 200-300s to form the inner layer rubber strip. The third step is to feed the surface layer rubber strip and the inner layer rubber strip into two extruders respectively, and extrude them through the same die head. The extrusion temperature is controlled at 40-50℃ and the die head temperature is 50-60℃ to form a semi-finished sheet material. Step 4: Place the semi-finished board into an oven with multiple drying tunnels for vulcanization and foaming. Control the temperature of the drying tunnels in sequence as follows: Section 1 125±5℃, Section 2 130±5℃, Section 3 140±5℃, Section 4 150±5℃, Section 5 160±5℃, and Section 6 170±5℃. After foaming, cool the board to obtain double-layer rubber and plastic board.

3. The double-layer rubber-plastic sheet with heat insulation and noise reduction function according to claim 1, characterized in that, In step S1, the surface modifier is chloroethyl isocyanate or 3-chloropropyl isocyanate.

4. The double-layer rubber-plastic sheet with heat insulation and noise reduction function according to claim 1, characterized in that, In step S1, the catalyst is any one of octyl tin mercaptan, dibutyltin dilaurate, stannous octoate, or dibutyltin diacetate.

5. A double-layer rubber-plastic sheet with heat insulation and noise reduction functions according to claim 1, characterized in that, In step S2, the alkaline hydroxide aqueous solution is a potassium hydroxide aqueous solution or a sodium hydroxide aqueous solution, with a mass fraction of 10-20%.

6. A double-layer rubber-plastic sheet with heat insulation and noise reduction functions according to claim 1, characterized in that, In step S2, the preparation method of the functional bridging agent is as follows: 5-Bromopyrimidine-2-carboxylic acid and tetrahydrofuran were added to a reaction vessel and stirred. After a homogeneous mixture was formed, nitrogen gas was introduced for protection. Then, a condensing agent and an accelerator were added. After stirring at room temperature for 20-40 minutes, bis(2-hydroxyethyl) ester of [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphoric acid hexane-6-yl)methyl]succinic acid was added to the reaction vessel. After the addition was complete, the temperature was raised to 40-50℃ and maintained for 3-6 hours. The solvent was then evaporated and the product was collected to obtain the functional bridging agent.

7. A double-layer rubber-plastic sheet with heat insulation and noise reduction functions according to claim 6, characterized in that, The molar ratio of 5-bromopyrimidine-2-carboxylic acid to [(6-oxo-6H-dibenzo[C,E][1,2]oxophosphazenecyclo-6-yl)methyl]succinic acid bis(2-hydroxyethyl) ester is 2:

1.

8. A double-layer rubber-plastic sheet with heat insulation and noise reduction functions according to claim 6, characterized in that, The condensing agent is dicyclohexylcarbodiimide or 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide; the accelerator is 4-dimethylaminopyridine or N-hydroxysuccinimide.

9. A double-layer rubber-plastic sheet with heat insulation and noise reduction functions according to claim 1, characterized in that, The antioxidant is at least one of antioxidant 4020 or antioxidant MBT; the foaming agent is AC foaming agent; the vulcanizing agent is sulfur; the vulcanization aid is at least one of vulcanization accelerator PZ, vulcanization accelerator DPTT or vulcanization accelerator EZ; and the stabilizer is calcium-zinc stabilizer.

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