Rubber and plastic thermal insulation material based on nano-attapulgite powder and preparation method of rubber and plastic thermal insulation material

Abstract

The invention discloses a rubber and plastic thermal insulation material based on nano attapulgite powder and a preparation method thereof, and relates to the technical field of rubber and plastic thermal insulation materials. The rubber and plastic thermal insulation material based on the nano attapulgite powder comprises the following raw materials in parts by weight: 42-56 parts of nitrile rubber, 21-29 parts of polyvinyl chloride, 5-8 parts of a foaming agent, 6-10 parts of the nano attapulgite powder, 2-8 parts of a functional aid, 1-2 parts of a vulcanizing agent, 0.5-1 part of an activating agent and 5-10 parts of a plasticizer. The nano attapulgite powder and the functional aid are used in the rubber and plastic heat-insulating material taking the nitrile rubber and the polyvinyl chloride as matrixes, so that the rubber and plastic heat-insulating material is small in processing dust and good in dispersity, and the rubber and plastic heat-insulating material can be endowed with good heat-insulating property, mechanical strength, flame retardance and ageing resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber-plastic insulation materials, and particularly relates to a rubber-plastic insulation material based on nano-type attapulgite powder and a preparation method thereof. BACKGROUND

[0002] The rubber-plastic insulation material is a kind of elastic closed-cell foaming material, which has the characteristics of low thermal conductivity, fire resistance, moisture resistance, shock absorption and noise reduction, and is widely used in central air conditioning, building, chemical industry, electrical appliances and other cold and hot medium pipelines or containers. The ordinary rubber-plastic insulation material is mainly made of nitrile rubber (NBR) and polyvinyl chloride resin (PVC) by blending and foaming, but in order to improve the flame retardant performance of the rubber-plastic insulation material, a large amount of flame retardant needs to be added, which will adversely affect the mechanical properties of the material.

[0003] Attapulgite (also known as attapulgite clay, abbreviated as attapulgite) is a kind of layered chain hydrous magnesium-aluminum silicate clay mineral, which can be used as a filler for high polymer materials and can improve the mechanical properties and flame retardant properties of high temperature materials. However, when attapulgite is made into ultra-fine powder with nano particle size, the specific surface area increases and the surface energy increases, which is easy to cause agglomeration. Therefore, it is worth studying how to apply nano-type attapulgite to rubber-plastic insulation materials.

[0004] Titanium dioxide can absorb ultraviolet energy through valence band electrons and convert it into heat energy dissipation, and also has scattering effect on ultraviolet light, so it is widely used in the anti-aging of high polymer materials. However, the photocatalytic effect of titanium dioxide excited by ultraviolet light can produce active species such as hydroxyl radicals, which can attack the polymer main chain and accelerate the aging and degradation of the polymer, so the application of titanium dioxide in rubber-plastic insulation materials is limited.

[0005] As described above, it is necessary to provide a suitable method for treating nano-type attapulgite powder and titanium dioxide, and applying them to rubber-plastic insulation materials based on nitrile rubber and polyvinyl chloride, so as to obtain rubber-plastic insulation materials with excellent mechanical strength, flame retardancy and anti-aging properties. SUMMARY

[0006] In order to solve the above technical problems, the present application provides a rubber-plastic insulation material based on nano-type attapulgite powder and a preparation method thereof.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] A rubber-plastic insulation material based on nano-type attapulgite powder, comprising the following raw materials by weight: nitrile rubber 42-56 parts, polyvinyl chloride 21-29 parts, foaming agent 5-8 parts, nano-type attapulgite powder 6-10 parts, functional additive 2-8 parts, vulcanizing agent 1-2 parts, activator 0.5-1 parts, plasticizer 5-10 parts.

[0009] Further, the foaming agent is azodicarbonamide; the vulcanizing agent is di-tert-butyl peroxide isopropyl benzene;

[0010] Further, the activator is zinc oxide; the plasticizer is chlorinated paraffin, citrate ester mixed in a mass ratio of 1-1.2:2-3;

[0011] The preparation method of the nanometer-based attapulgite powder-based rubber and plastic thermal insulation material comprises the following steps:

[0012] The butyl rubber, polyvinyl chloride, plasticizer, nanometer-based attapulgite powder, and functional additives are sequentially added into a high-speed mixer for mixing, and then the foaming agent, vulcanizing agent, and activator are added for mixing to obtain a premix, which is sent into a double-screw extruder for melt blending, extrusion, and vulcanization to obtain the nanometer-based attapulgite powder-based rubber and plastic thermal insulation material.

[0013] Further, the mixing temperature is 110-120℃, and the mixing time is 15-20min.

[0014] Further, the temperature control of the double-screw extruder is as follows: the feeding section is 160-180℃, the compression section is 170-190℃, the metering section is 175-185℃, and the head section is 180-200℃.

[0015] Further, the vulcanization temperature is 170-180℃, and the vulcanization time is 5-10min.

[0016] The preparation method of the nanometer-based attapulgite powder comprises the following steps:

[0017] Step A1, drying the attapulgite to obtain pretreated attapulgite; and ball milling the pretreated attapulgite to obtain product 1.

[0018] Step A2, mixing thiourea, sodium molybdate, deionized water, and product 1 to perform a hydrothermal reaction to obtain product 2; and treating product 2 with oxygen plasma to obtain product 3.

[0019] Step A3, mixing KH560, ethanol, and deionized water to prepare a hydrolysis solution; mixing product 3, anhydrous ethanol, and the hydrolysis solution to perform a heating reaction to obtain product 4; mixing product 4, a cyano-containing fatty amine, acetonitrile, and DMF to perform ultrasonic dispersion, adding 4-methoxypyridine, and performing a heating reaction to obtain product 5.

[0020] Step A4, mixing product 5, methanol, and DMAC to perform ultrasonic dispersion, adding phosphorus oxychloride and pyridine, and performing a heating reflux reaction to obtain the nanometer-based attapulgite powder.

[0021] Further, the preparation method of the nanometer-based attapulgite powder comprises the following specific steps:

[0022] Step A1, dry the attapulgite at 80-90℃ for 8-8.5h to obtain the pretreated attapulgite; mix the pretreated attapulgite and zirconium oxide balls, ball mill at 500-600rpm, measure the particle size using a laser particle size analyzer to obtain product 1;

[0023] Further, the use amount ratio of the pretreated attapulgite and zirconium oxide balls is 1g:10-12g; the particle size is 100-200nm; the diameter of the zirconium oxide balls is 0.6-1mm;

[0024] In step A1, the nanometer-sized attapulgite powder, i.e. product 1, is obtained by dry grinding;

[0025] Step A2, mix thiourea, sodium molybdate and deionized water and stir for 10-15min, add product 1, ultrasonically disperse at 100-150W power for 20-25min, adjust the pH to 4-4.5, transfer to a hydrothermal reaction kettle, react at 220-230℃ for 24-24.5h to obtain product 2; treat product 2 with oxygen plasma for 3-4min to obtain product 3;

[0026] Further, the use amount ratio of the thiourea, sodium molybdate, deionized water and product 1 is 1.5-2.0g:2.8-3.3g:60-70mL:1.6-2.0g; the oxygen plasma treatment conditions are temperature of 110-115℃, oxygen flow of 20-30sccm and power of 200-300W;

[0027] In step A2, the nanometer-sized attapulgite powder is in-situ grown with molybdenum disulfide nanosheets on the surface to obtain product 2; product 2 is treated with oxygen plasma to increase the oxygen-containing functional groups on the surface of product 2 to obtain product 3;

[0028] Step A3, mix KH560, ethanol and deionized water, stir at pH 4-4.5 and temperature 35-40℃ for 3-3.5h to obtain a hydrolysis solution; mix product 3, anhydrous ethanol and the hydrolysis solution, heat to 40-45℃, stir for 10-10.5h to obtain product 4; mix product 4, cyano-containing fatty amine, acetonitrile and DMF, ultrasonically disperse at 50-100W power for 30-40min, add 4-methoxypyridine, heat to 50-55℃, stir and react for 8-9h to obtain product 5;

[0029] Further, the use amount ratio of KH560, ethanol, deionized water in the hydrolysis solution is 12.5-13 g: 20-22 mL: 3-5 mL; the use amount ratio of product 3, anhydrous ethanol, hydrolysis solution is 10-11 g: 55-65 mL: 6-8 mL; the use amount ratio of product 4, cyano-containing aliphatic amine, acetonitrile, DMF, 4-methoxypyridine is 13-15 g: 6-7 g: 15-20 mL: 55-60 mL: 55-65 mg; the cyano-containing aliphatic amine is 6-aminocapronitrile;

[0030] In step A3, the product 3 is modified after hydrolysis of KH560 to obtain a coated product (palygorskite powder coated with molybdenum disulfide nanosheets) containing epoxy groups on the surface, i.e. product 4; the epoxy groups of the product 4 react with the primary amino groups of the cyano-containing aliphatic amine to obtain a coated product (palygorskite powder coated with molybdenum disulfide nanosheets) containing secondary alcohol hydroxyl groups and cyano groups, i.e. product 5;

[0031] In step A4, the product 5, methanol, DMAC are mixed, ultrasonic dispersion is carried out at a power of 50-100 W for 35-40 min, phosphorus oxychloride and pyridine are added, reflux stirring is carried out at 55-65°C for 10-11 h to obtain nano-type attapulgite powder;

[0032] Further, the use amount ratio of the product 5, methanol, DMAC, phosphorus oxychloride, pyridine is 18-20 g: 5-10 mL: 85-90 mL: 7.5-8 g: 35-45 mg; the phosphorus oxychloride is diphenyl phosphorochloridate;

[0033] In step A4, the secondary alcohol hydroxyl groups of the product 5 react with the phosphorus oxychloride to obtain a coated product (palygorskite powder coated with molybdenum disulfide nanosheets) containing phosphoric acid ester and cyano groups, i.e. nano-type attapulgite powder.

[0034] The preparation method of the functional additive comprises the following steps:

[0035] In step B1, nano-titanium dioxide is dispersed into anhydrous ethanol, ultrasonic dispersion and drying are carried out to obtain dried nano-titanium dioxide; the dried nano-titanium dioxide, maleic anhydride and potassium persulfate are mixed, reaction is carried out in a protective gas, and then the product a is obtained by centrifugal washing with anhydrous ethanol and drying;

[0036] In step B2, a thioether-containing fatty alcohol, DMF and sodium hydroxide solution are mixed, epichlorohydrin is added, and heating reaction is carried out to obtain product b; product b, a diphenylamine compound, triethylamine and acetone are mixed to obtain product c;

[0037] Step B3, the product c, potassium carbonate solution, dimethyl sulfoxide mixed stirring, dropwise add mixed solution s under ice water bath, heating to room temperature, reaction to product d; product d, methyl acrylate, emulsifier, dispersing agent, methanol, product a mixed, ultrasonic dispersion, add initiator, heating reaction, and then add initiator, continue to react to get functional additives.

[0038] Further, the preparation method of the functional additive comprises the following specific steps:

[0039] Step B1, the nano titanium dioxide is dispersed into anhydrous ethanol, ultrasonic dispersion for 1-1.5h, and dried at 60-70℃ for 4-5h to obtain dried nano titanium dioxide; the dried nano titanium dioxide, maleic anhydride and potassium persulfate are mixed, protective gas is introduced, and reaction is carried out at 70-80℃ for 5-6h; then the mixture is washed with anhydrous ethanol by centrifugation for 3-5 times, and dried at 60-70℃ for 7-8h to obtain product a;

[0040] Further, the ratio of the nano titanium dioxide to anhydrous ethanol is 10-12g:60-65mL; and the ratio of the dried nano titanium dioxide, maleic anhydride and potassium persulfate is 10-12g:1-2g:10-20mg;

[0041] In step B1, under the protective gas atmosphere, maleic anhydride and the hydroxyl group on the surface of nano titanium dioxide are subjected to mono-esterification reaction by melt grafting method, so that carboxyl groups are introduced on the surface of nano titanium dioxide to obtain product a;

[0042] Step B2, the thioether-containing fatty alcohol and DMF are mixed and stirred for 10-15min, sodium hydroxide solution is added, and stirring is continued for 5-7min; epichlorohydrin is added, and reaction is carried out at 40-45℃ for 6-6.5h to obtain product b; product b, diphenylamine compound, triethylamine and acetone are mixed, and reaction is carried out at room temperature for 6-7h to obtain product c;

[0043] Further, the ratio of the thioether-containing fatty alcohol, DMF, sodium hydroxide solution and epichlorohydrin is 5.5-6.5g:13-15mL:3-5mL:5-6g; the thioether-containing fatty alcohol is 3-methylthiopropanol; the mass fraction of sodium hydroxide solution is 5-7%; and the ratio of product b, diphenylamine compound, triethylamine and acetone is 12-13g:9.5-10.5g:55-65mg:50-60mL; the diphenylamine compound is o-aminodiphenylamine;

[0044] In step B2, under the action of sodium hydroxide solution, the thioether-containing fatty alcohol and epichlorohydrin undergo ring-opening and ring-closing reactions to obtain a thioether with epoxy groups, i.e. product b; the epoxy group of product b reacts with the primary amino group of the diphenylamine compound to obtain a product c containing a secondary alcohol;

[0045] Step B3, the product c, potassium carbonate solution, dimethyl sulfoxide are mixed and stirred for 35-45 min, drop the mixed solution s under ice water bath, after adding, warm to room temperature, reaction 12-13 h, to obtain product d; product d, methyl acrylate, emulsifier, dispersant, methanol are mixed and stirred for 40-45 min, add product a, ultrasonic dispersion under 50-100 W power for 30-35 min, add initiator, warm to 65-70 DEG C, stirring reaction 6-7 h, add initiator again, continue to stir for 5-6 h, to obtain functional adjuvant;

[0046] Further, the product c, potassium carbonate solution, dimethyl sulfoxide, the amount of mixed solution s is 23-24 g: 10-12 mL: 50-55 mL: 35-37 mL; the mass fraction of potassium carbonate solution is 30-35%; mixed solution s is methyl acryloyl chloride, pyridine, dimethyl sulfoxide, which is mixed according to the amount ratio of 11-12 g: 8-10 mg: 23-25 mL;

[0047] Further, the product d, methyl acrylate, emulsifier, dispersant, methanol, product a, initiator are in the amount ratio of 4.5-5.5 g: 30-40 g: 1-2 g: 1-3 g: 45-55 mL: 10-12 g: 0.8-1.2 g; the emulsifier is OP-10; the dispersant is polyvinylpyrrolidone; the initiator is azobisisobutyronitrile; the initiator is added twice, and the mass ratio of the first and second added initiator is 1:1.5;

[0048] In step B3, the methacryloyl chloride in the mixed solution s reacts with the secondary alcohol with small steric hindrance and high activity in the product c to obtain the product d with a terminal double bond; the product d and methyl acrylate are polymerized under the action of the initiator to coat the product a (the nano-titanium dioxide with carboxyl on the surface), and the functional adjuvant is obtained.

[0049] The application discloses a kind of based on nano-type attapulgite powder rubber plastic heat-insulating material and preparation method thereof, and rubber plastic heat-insulating material is by nitrile rubber, polyvinyl chloride, foaming agent, nano-type attapulgite powder, functional adjuvant, vulcanizing agent, activator, plasticizer according to certain proportion is mixed, melt extrusion, vulcanization and obtains.

[0050] The nano-type attapulgite powder used in the present application is prepared by grinding attapulgite into nano-particle-sized attapulgite powder, coating the nano-particle-sized attapulgite powder with molybdenum disulfide nanosheets, treating the coated nano-particle-sized attapulgite powder with plasma, modifying the treated nano-particle-sized attapulgite powder with KH560, and then grafting the modified nano-particle-sized attapulgite powder with a cyano-containing fatty amine and phosphorus oxychloride. The sheet structure of the molybdenum disulfide nanosheets can effectively block heat transfer and, in combination with the attapulgite powder which has strong thermal stability, impart good heat preservation performance to the rubber and plastic heat preservation material. The lubricity of molybdenum disulfide can avoid the occurrence of dust problems of the nano-type attapulgite powder during processing. The nano-particle-sized attapulgite powder, after being coated with molybdenum disulfide nanosheets, modified with KH560, and reacted with a cyano-containing fatty amine, has better dispersibility in the rubber and plastic heat preservation material, and the interfacial bonding force with nitrile rubber and polyvinyl chloride is enhanced, which is helpful to the improvement of the mechanical properties of the rubber and plastic heat preservation material. The use of phosphorus oxychloride in combination with the nano-particle-sized attapulgite powder coated with molybdenum disulfide improves the stability of the phosphate ester. The phosphate ester decomposes to produce acidic substances at high temperatures, promotes the interlayer intercalation of the nano-type attapulgite powder, forms a dense and stable carbon layer, and prevents the continuation of combustion and the propagation of flames.

[0051] The functional additive used in the present application is product d prepared from a thioether-containing fatty alcohol, a diphenylamine compound, and methacryloyl chloride as main raw materials, and then product a (nanometer titanium dioxide with carboxyl groups on the surface) is coated with methyl acrylate. After the nanometer titanium dioxide is treated with maleic anhydride, carboxyl functional groups are formed on the surface, which is more easily coated with product d and methyl acrylate. The coating layer on the surface of the nanometer titanium dioxide will form a barrier, reducing the photocatalytic activity of the nanometer titanium dioxide, reducing the generation of active oxygen species such as hydroxyl radicals excited by ultraviolet light, and weakening the photoaging of polymers such as nitrile rubber and polyvinyl chloride. The use of a thioether-containing fatty alcohol and a diphenylamine compound in combination grafts them into the coating layer on the surface of the nanometer titanium dioxide, enhancing their own stability. The diphenylamine compound reacts with peroxide radicals to generate stable diphenylamine radicals and hydroperoxide, interrupting the radical chain reaction. The thioether-containing fatty alcohol further inhibits oxidative aging reactions by decomposing hydroperoxide. In combination with the nanometer titanium dioxide, they impart good anti-aging properties to the rubber and plastic heat preservation material. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] Embodiment 1

[0054] A nano-type attapulgite powder is prepared by the following steps:

[0055] Step A1: Dry attapulgite (supplier: Lingshou County Baiyi Mineral Products Processing Plant, specification 325 mesh) at 80℃ for 8 hours to obtain pretreated attapulgite; mix the pretreated attapulgite with zirconia balls, ball mill at 500 rpm, and measure the particle size using a laser particle size analyzer to obtain product 1; the ratio of pretreated attapulgite to zirconia balls is 1g:10g; the particle size is 100nm; the diameter of the zirconia balls is 0.6mm;

[0056] Step A2: Mix thiourea, sodium molybdate, and deionized water and stir for 10 min. Add product 1 and ultrasonically disperse at 100 W for 20 min. Adjust the pH to 4 with 0.1 mol / L hydrochloric acid solution. Transfer to a hydrothermal reactor and react at 220 °C for 24 h to obtain product 2. Treat product 2 with oxygen plasma for 3 min to obtain product 3. The ratio of thiourea, sodium molybdate, deionized water, and product 1 is 1.5 g: 2.8 g: 60 mL: 1.6 g. The oxygen plasma treatment conditions are: temperature 110 °C, oxygen flow rate 20 sccm, and power 200 W.

[0057] Step A3: KH560, ethanol, and deionized water are mixed and stirred at pH 4 and 35°C for 3 hours to obtain a hydrolysate; Product 3, anhydrous ethanol, and the hydrolysate are mixed and heated to 40°C and stirred for 10 hours to obtain Product 4; Product 4, 6-aminohexanonitrile, acetonitrile, and DMF are mixed and ultrasonically dispersed at 50W for 30 minutes, 4-methoxypyridine is added, and the mixture is heated to 50°C and stirred for 8 hours to obtain Product 5; The ratio of KH560, ethanol, and deionized water in the hydrolysate is 12.5g:20mL:3mL; the ratio of product 3, anhydrous ethanol, and the hydrolysate is 10g:55mL:6mL; the ratio of product 4, 6-aminohexanonitrile, acetonitrile, DMF, and 4-methoxypyridine is 13g:6g:15mL:55mL:55mg.

[0058] Step A4: Mix product 5, methanol, and DMAC, and ultrasonically disperse at 50W for 35 min. Add diphenylphosphine chloride and pyridine, and reflux and stir at 55℃ for 10 h to obtain nano-sized attapulgite powder. The ratio of product 5, methanol, DMAC, diphenylphosphine chloride, and pyridine is 18g:5mL:85mL:7.5g:35mg.

[0059] Example 2

[0060] A nano-sized attapulgite powder, the preparation method of which includes the following steps:

[0061] Step A1: Dry attapulgite (supplier: Lingshou County Baiyi Mineral Products Processing Plant, specification 325 mesh) at 85℃ for 8.3 hours to obtain pretreated attapulgite; mix the pretreated attapulgite with zirconia balls, ball mill at 550 rpm, and measure the particle size using a laser particle size analyzer to obtain product 1; the ratio of pretreated attapulgite to zirconia balls is 1g:11g; the particle size is 150nm; the diameter of the zirconia balls is 0.8mm;

[0062] Step A2: Thiourea, sodium molybdate, and deionized water are mixed and stirred for 13 min. Product 1 is added, and the mixture is ultrasonically dispersed at 130 W for 23 min. The pH is adjusted to 4.3 with 0.1 mol / L hydrochloric acid solution. The mixture is then transferred to a hydrothermal reactor and reacted at 225 °C for 24.3 h to obtain product 2. Product 2 is then treated with oxygen plasma for 3.5 min to obtain product 3. The ratio of thiourea, sodium molybdate, deionized water, and product 1 is 1.8 g: 3.1 g: 65 mL: 1.8 g. The oxygen plasma treatment conditions are: temperature 113 °C, oxygen flow rate 25 sccm, and power 250 W.

[0063] Step A3: KH560, ethanol, and deionized water are mixed and stirred at pH 4.3 and 37°C for 3.3 h to obtain a hydrolysate; Product 3, anhydrous ethanol, and the hydrolysate are mixed and heated to 43°C and stirred for 10.3 h to obtain Product 4; Product 4, 6-aminohexanonitrile, acetonitrile, and DMF are mixed and ultrasonically dispersed at 80W for 35 min, 4-methoxypyridine is added, and the mixture is heated to 53°C and stirred for 8.5 h to obtain Product 5; The ratio of KH560, ethanol, and deionized water in the hydrolysate is 12.8 g: 21 mL: 4 mL; the ratio of Product 3, anhydrous ethanol, and the hydrolysate is 10.5 g: 60 mL: 7 mL; the ratio of Product 4, 6-aminohexanonitrile, acetonitrile, DMF, and 4-methoxypyridine is 14 g: 6.5 g: 18 mL: 58 mL: 60 mg.

[0064] Step A4: Mix product 5, methanol, and DMAC, and ultrasonically disperse at 80W for 38 min. Add diphenylphosphine chloride and pyridine, and reflux and stir at 60℃ for 10.5 h to obtain nano-attapulgite powder. The ratio of product 5, methanol, DMAC, diphenylphosphine chloride, and pyridine is 19g:8mL:88mL:7.8g:40mg.

[0065] Example 3

[0066] A nano-sized attapulgite powder, the preparation method of which includes the following steps:

[0067] Step A1: Dry attapulgite (supplier: Lingshou County Baiyi Mineral Products Processing Plant, specification 325 mesh) at 90℃ for 8.5h to obtain pretreated attapulgite; mix the pretreated attapulgite and zirconia balls, ball mill at 600rpm, and measure the particle size using a laser particle size analyzer to obtain product 1; the ratio of the pretreated attapulgite to zirconia balls is 1g:12g; the particle size is 200nm; the diameter of the zirconia balls is 1mm;

[0068] Step A2: Mix thiourea, sodium molybdate, and deionized water and stir for 15 min. Add product 1 and ultrasonically disperse at 150 W for 25 min. Adjust the pH to 4.5 with 0.1 mol / L hydrochloric acid solution. Transfer to a hydrothermal reactor and react at 230 °C for 24.5 h to obtain product 2. Treat product 2 with oxygen plasma for 4 min to obtain product 3. The ratio of thiourea, sodium molybdate, deionized water, and product 1 is 2.0 g: 3.3 g: 70 mL: 2.0 g. The oxygen plasma treatment conditions are: temperature 115 °C, oxygen flow rate 30 sccm, and power 300 W.

[0069] Step A3: KH560, ethanol, and deionized water are mixed and stirred at pH 4.5 and 40°C for 3.5 h to obtain a hydrolysate; Product 3, anhydrous ethanol, and the hydrolysate are mixed and heated to 45°C and stirred for 10.5 h to obtain Product 4; Product 4, 6-aminohexanonitrile, acetonitrile, and DMF are mixed and ultrasonically dispersed at 100W for 40 min, 4-methoxypyridine is added, and the mixture is heated to 55°C and stirred for 9 h to obtain Product 5; The ratio of KH560, ethanol, and deionized water in the hydrolysate is 13 g: 22 mL: 5 mL; the ratio of product 3, anhydrous ethanol, and the hydrolysate is 11 g: 65 mL: 8 mL; the ratio of product 4, 6-aminohexanonitrile, acetonitrile, DMF, and 4-methoxypyridine is 15 g: 7 g: 20 mL: 60 mL: 65 mg.

[0070] Step A4: Mix product 5, methanol, and DMAC, and ultrasonically disperse at 100W for 40 min. Add diphenylphosphine chloride and pyridine, and reflux and stir at 65℃ for 11 h to obtain nano-attapulgite powder. The ratio of product 5, methanol, DMAC, diphenylphosphine chloride, and pyridine is 20g:10mL:90mL:8g:45mg.

[0071] Example 4

[0072] A functional additive, the preparation method of which includes the following steps:

[0073] Step B1: Disperse nano-titanium dioxide (supplier: Luoyang Tongrun Nanotechnology Co., Ltd., 200nm) in anhydrous ethanol, ultrasonically disperse at 50W for 1h, and dry at 60℃ for 4h to obtain dried nano-titanium dioxide; mix the dried nano-titanium dioxide, maleic anhydride, and potassium persulfate, purge with nitrogen, react at 70℃ for 5h, then wash three times with anhydrous ethanol by centrifugation, and dry at 60℃ for 7h to obtain product a; the ratio of nano-titanium dioxide to anhydrous ethanol is 10g:60mL; the ratio of dried nano-titanium dioxide, maleic anhydride, and potassium persulfate is 10g:1g:10mg;

[0074] Step B2: Mix 3-methylthiopropanol and DMF, stir for 10 min, add sodium hydroxide solution, continue stirring for 5 min, add epichlorohydrin, and react at 40℃ for 6 h to obtain product b; mix product b, o-aminodiphenylamine, triethylamine, and acetone, and react at room temperature for 6 h to obtain product c; the ratio of 3-methylthiopropanol, DMF, sodium hydroxide solution, and epichlorohydrin is 5.5 g: 13 mL: 3 mL: 5 g; the mass fraction of sodium hydroxide solution is 5%; the ratio of product b, o-aminodiphenylamine, triethylamine, and acetone is 12 g: 9.5 g: 55 mg: 50 mL;

[0075] Step B3: Mix product c, potassium carbonate solution, and dimethyl sulfoxide and stir for 35 min. Add mixture s dropwise under an ice-water bath. After the addition is complete, heat to room temperature and react for 12 h to obtain product d. Mix product d, methyl acrylate, OP-10, polyvinylpyrrolidone, and methanol and stir for 40 min. Add product a and ultrasonically disperse at 50 W for 30 min. Add azobisisobutyronitrile (AIBN), heat to 65 °C, and stir for 6 h. Add AIBN again and continue stirring for 5 h to obtain the functional additive.

[0076] The ratio of product c, potassium carbonate solution, dimethyl sulfoxide, and mixture s is 23g:10mL:50mL:35mL; the mass fraction of potassium carbonate solution is 30%; mixture s is obtained by mixing methacryloyl chloride, pyridine, and dimethyl sulfoxide in a ratio of 11g:8mg:23mL; the ratio of product d, methyl acrylate, OP-10, polyvinylpyrrolidone, methanol, product a, and azobisisobutyronitrile is 4.5g:30g:1g:1g:45mL:10g:0.8g; azobisisobutyronitrile is added in two batches, with a mass ratio of 1:1.5 between the first and second additions.

[0077] Example 5

[0078] A functional additive, the preparation method of which includes the following steps:

[0079] Step B1: Disperse nano-titanium dioxide (supplier: Luoyang Tongrun Nanotechnology Co., Ltd., 200nm) in anhydrous ethanol, ultrasonically disperse at 80W for 1.3h, and dry at 65℃ for 4.5h to obtain dried nano-titanium dioxide; mix the dried nano-titanium dioxide, maleic anhydride, and potassium persulfate, purge with nitrogen, react at 75℃ for 5.5h, then wash four times with anhydrous ethanol by centrifugation, and dry at 65℃ for 7.5h to obtain product a; the ratio of nano-titanium dioxide to anhydrous ethanol is 11g:63mL; the ratio of dried nano-titanium dioxide, maleic anhydride, and potassium persulfate is 11g:1.5g:15mg;

[0080] Step B2: Mix 3-methylthiopropanol and DMF, stir for 13 min, add sodium hydroxide solution, continue stirring for 6 min, add epichlorohydrin, and react at 43℃ for 6.3 h to obtain product b; mix product b, o-aminodiphenylamine, triethylamine, and acetone, and react at room temperature for 6.5 h to obtain product c; the ratio of 3-methylthiopropanol, DMF, sodium hydroxide solution, and epichlorohydrin is 6.0 g: 14 mL: 4 mL: 5.5 g; the mass fraction of sodium hydroxide solution is 6%; the ratio of product b, o-aminodiphenylamine, triethylamine, and acetone is 12.5 g: 10.0 g: 60 mg: 55 mL;

[0081] Step B3: Mix product c, potassium carbonate solution, and dimethyl sulfoxide and stir for 40 min. Add mixture s dropwise under an ice-water bath. After the addition is complete, heat to room temperature and react for 12.5 h to obtain product d. Mix product d, methyl acrylate, OP-10, polyvinylpyrrolidone, and methanol and stir for 43 min. Add product a and ultrasonically disperse at 80 W for 33 min. Add azobisisobutyronitrile (AIBN), heat to 68 °C, and stir for 6.5 h. Add AIBN again and continue stirring for 5.5 h to obtain the functional additive.

[0082] The ratio of product c, potassium carbonate solution, dimethyl sulfoxide, and mixture s is 23.5 g: 11 mL: 53 mL: 36 mL; the mass fraction of potassium carbonate solution is 33%; mixture s is obtained by mixing methacryloyl chloride, pyridine, and dimethyl sulfoxide in a ratio of 11.5 g: 9 mg: 24 mL; the ratio of product d, methyl acrylate, OP-10, polyvinylpyrrolidone, methanol, product a, and azobisisobutyronitrile is 5.0 g: 35 g: 1.5 g: 2 g: 50 mL: 11 g: 1.0 g; azobisisobutyronitrile is added in two batches, with a mass ratio of 1:1.5 between the first and second additions.

[0083] Example 6

[0084] A functional additive, the preparation method of which includes the following steps:

[0085] Step B1: Disperse nano-titanium dioxide (supplier: Luoyang Tongrun Nanotechnology Co., Ltd., 200nm) in anhydrous ethanol, ultrasonically disperse at 100W for 1.5h, and dry at 70℃ for 5h to obtain dried nano-titanium dioxide; mix the dried nano-titanium dioxide, maleic anhydride, and potassium persulfate, purge with nitrogen, react at 80℃ for 6h, then wash 5 times with anhydrous ethanol by centrifugation, and dry at 70℃ for 8h to obtain product a; the ratio of nano-titanium dioxide to anhydrous ethanol is 12g:65mL; ​​the ratio of dried nano-titanium dioxide, maleic anhydride, and potassium persulfate is 12g:2g:20mg;

[0086] Step B2: Mix 3-methylthiopropanol and DMF, stir for 15 min, add sodium hydroxide solution, continue stirring for 7 min, add epichlorohydrin, and react at 45℃ for 6.5 h to obtain product b; mix product b, o-aminodiphenylamine, triethylamine, and acetone, and react at room temperature for 7 h to obtain product c; the ratio of 3-methylthiopropanol, DMF, sodium hydroxide solution, and epichlorohydrin is 6.5 g: 15 mL: 5 mL: 6 g; the mass fraction of sodium hydroxide solution is 7%; the ratio of product b, o-aminodiphenylamine, triethylamine, and acetone is 13 g: 10.5 g: 65 mg: 60 mL;

[0087] Step B3: Mix product c, potassium carbonate solution, and dimethyl sulfoxide and stir for 45 min. Add mixture s dropwise under an ice-water bath. After the addition is complete, heat to room temperature and react for 13 h to obtain product d. Mix product d, methyl acrylate, OP-10, polyvinylpyrrolidone, and methanol and stir for 45 min. Add product a and ultrasonically disperse at 100 W for 35 min. Add azobisisobutyronitrile (AIBN), heat to 70 °C, and stir for 7 h. Add AIBN again and continue stirring for 6 h to obtain the functional additive.

[0088] The ratio of product c, potassium carbonate solution, dimethyl sulfoxide, and mixture s is 24g:12mL:55mL:37mL; the mass fraction of potassium carbonate solution is 35%; mixture s is obtained by mixing methacryloyl chloride, pyridine, and dimethyl sulfoxide in a ratio of 12g:10mg:25mL; the ratio of product d, methyl acrylate, OP-10, polyvinylpyrrolidone, methanol, product a, and azobisisobutyronitrile is 5.5g:40g:2g:3g:55mL:12g:1.2g; azobisisobutyronitrile is added in two batches, with a mass ratio of 1:1.5 between the first and second additions.

[0089] Example 7

[0090] A rubber-plastic thermal insulation material based on nano-attapulgite powder comprises the following raw materials in parts by weight: 42 parts of nitrile rubber (supplier: Dongguan Jiaqing Plastic Raw Materials Co., Ltd., 200 mesh), 21 parts of polyvinyl chloride (supplier: Wuhan Shuer Biotechnology Co., Ltd., 1kg / bag), 5 parts of foaming agent, 6 parts of nano-attapulgite powder obtained in Example 1, 2 parts of functional additives obtained in Example 4, 1 part of vulcanizing agent, 0.5 parts of activator, and 5 parts of plasticizer;

[0091] The foaming agent is azodicarbonamide; the vulcanizing agent is bis-tert-butylperoxyisopropylbenzene; the activator is zinc oxide (supplier: Shanghai Junpu Chemical Co., Ltd., model ZNO-80); the plasticizer is a mixture of chlorinated paraffin and triethyl citrate in a mass ratio of 1:2.

[0092] The preparation method of the rubber-plastic thermal insulation material based on nano-attapulgite powder includes the following steps:

[0093] Nitrile rubber, polyvinyl chloride, plasticizer, nano-attapulgite powder obtained in Example 1, and functional additives obtained in Example 4 were sequentially added to a high-speed mixer and mixed at 110°C for 15 minutes. Then, foaming agent, vulcanizing agent, and activator were added and mixed to obtain a premix. The premix was then fed into a twin-screw extruder for melt blending, extrusion, and vulcanization to obtain a rubber-plastic thermal insulation material based on nano-attapulgite powder. The temperature control of the twin-screw extruder sections was as follows: feeding section 160°C, compression section 170°C, metering section 175°C, and die head section 180°C. The vulcanization temperature was 170°C and the time was 5 minutes.

[0094] Example 8

[0095] A rubber-plastic thermal insulation material based on nano-attapulgite powder comprises the following raw materials in parts by weight: 49 parts of nitrile rubber (supplier: Dongguan Jiaqing Plastic Raw Materials Co., Ltd., 200 mesh), 25 parts of polyvinyl chloride (supplier: Wuhan Shuer Biotechnology Co., Ltd., 1kg / bag), 6.5 parts of foaming agent, 8 parts of nano-attapulgite powder obtained in Example 2, 5 parts of functional additives obtained in Example 5, 1.5 parts of vulcanizing agent, 0.8 parts of activator, and 8 parts of plasticizer;

[0096] The foaming agent is azodicarbonamide; the vulcanizing agent is bis-tert-butylperoxyisopropylbenzene; the activator is zinc oxide (supplier: Shanghai Junpu Chemical Co., Ltd., model ZNO-80); the plasticizer is a mixture of chlorinated paraffin and triethyl citrate in a mass ratio of 1.1:2.5.

[0097] The preparation method of the rubber-plastic thermal insulation material based on nano-attapulgite powder includes the following steps:

[0098] Nitrile rubber, polyvinyl chloride, plasticizer, nano-attapulgite powder obtained in Example 2, and functional additives obtained in Example 5 were sequentially added to a high-speed mixer and mixed at 115°C for 18 minutes. Then, foaming agent, vulcanizing agent, and activator were added and mixed to obtain a premix. The premix was then fed into a twin-screw extruder for melt blending, extrusion, and vulcanization to obtain a rubber-plastic thermal insulation material based on nano-attapulgite powder. The temperature control of the twin-screw extruder sections was as follows: feeding section 170°C, compression section 180°C, metering section 180°C, and die head section 190°C. The vulcanization temperature was 175°C and the time was 8 minutes.

[0099] Example 9

[0100] A rubber-plastic thermal insulation material based on nano-attapulgite powder comprises the following raw materials in parts by weight: 56 parts of nitrile rubber (supplier: Dongguan Jiaqing Plastic Raw Materials Co., Ltd., 200 mesh), 29 parts of polyvinyl chloride (supplier: Wuhan Shuer Biotechnology Co., Ltd., 1kg / bag), 8 parts of foaming agent, 10 parts of nano-attapulgite powder obtained in Example 3, 8 parts of functional additives obtained in Example 6, 2 parts of vulcanizing agent, 1 part of activator, and 10 parts of plasticizer;

[0101] The foaming agent is azodicarbonamide; the vulcanizing agent is bis-tert-butylperoxyisopropylbenzene; the activator is zinc oxide (supplier: Shanghai Junpu Chemical Co., Ltd., model ZNO-80); the plasticizer is a mixture of chlorinated paraffin and triethyl citrate in a mass ratio of 1.2:3.

[0102] The preparation method of the rubber-plastic thermal insulation material based on nano-attapulgite powder includes the following steps:

[0103] Nitrile rubber, polyvinyl chloride, plasticizer, nano-attapulgite powder obtained in Example 3, and functional additives obtained in Example 6 were sequentially added to a high-speed mixer and mixed at 120°C for 20 minutes. Then, foaming agent, vulcanizing agent, and activator were added and mixed to obtain a premix. The premix was then fed into a twin-screw extruder for melt blending, extrusion, and vulcanization to obtain a rubber-plastic thermal insulation material based on nano-attapulgite powder. The temperature control of the twin-screw extruder sections was as follows: feeding section 180°C, compression section 190°C, metering section 185°C, and die head section 200°C. The vulcanization temperature was 180°C and the time was 10 minutes.

[0104] Comparative Example 1

[0105] Compared with Example 9, the nano-attapulgite powder used was replaced with Product 4, namely the coated product with epoxy groups on the surface (attapulgite powder with nano-sized particles coated with molybdenum disulfide nanosheets), and the rest was exactly the same as in Example 9, to obtain a rubber and plastic thermal insulation material based on nano-attapulgite powder.

[0106] Comparative Example 2

[0107] Compared with Example 9, the temperature of oxygen plasma treatment in step A2 of the preparation process of the nano-attapulgite powder was controlled at 180°C, and the rest was exactly the same as in Example 9, so as to obtain a rubber and plastic thermal insulation material based on nano-attapulgite powder.

[0108] Comparative Example 3

[0109] Compared with Example 9, the nano-attapulgite powder used was replaced with a mixture of product 5 and ammonium polyphosphate in a mass ratio of 10:3, and the rest was exactly the same as in Example 9, to obtain a rubber and plastic insulation material based on nano-attapulgite powder.

[0110] Comparative Example 4

[0111] Compared with Example 9, the functional additives used were replaced with a mixture of product a and product d in a mass ratio of 12:5.5, and the rest were completely the same as in Example 9, to obtain a rubber-plastic thermal insulation material based on nano-attapulgite powder.

[0112] Comparative Example 5

[0113] Compared with Example 9, product a in the preparation process of the functional additives was replaced with product a-1, and the rest was exactly the same as in Example 9, to obtain a rubber and plastic thermal insulation material based on nano-attapulgite powder.

[0114] The preparation of product a-1 is as follows: dried nano-titanium dioxide, KH550, ethanol and deionized water are mixed and stirred at 40℃ for 5.5h. The mixture is then washed with anhydrous ethanol and dried to obtain product a-1. The ratio of dried nano-titanium dioxide, KH550, ethanol and deionized water is 12g:2.6g:60mL:5mL.

[0115] Comparative Example 6

[0116] Compared with Example 9, product d in the preparation process of the functional additives was replaced with antioxidant 565, and the rest was exactly the same as in Example 9, to obtain a rubber and plastic thermal insulation material based on nano-attapulgite powder.

[0117] The following is a further performance test of the rubber-plastic thermal insulation material based on nano-attapulgite powder prepared according to the present invention. The test results are shown below.

[0118] Thermal conductivity: determined according to GB / T 10294-2008;

[0119] Tensile strength: determined according to GB / T 6344-2008;

[0120] Limiting oxygen index: determined according to GB / T 2406-2008;

[0121] Anti-aging performance: Xenon lamp aging test was conducted according to GB / T 16422-2014. A Daylight filter was used in the xenon lamp aging chamber, with the wavelength set to 340nm and the irradiance to 550W / m. 2 The rubber and plastic insulation material was placed in a xenon lamp aging chamber, and its anti-aging properties were judged by the cracking time.

[0122] The results are recorded in Table 1;

[0123] Table 1: Test Results

[0124] Example 7 Example 8 Example 9 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Thermal conductivity (25°C, W / (m-K)) 0.0298 0.0293 0.0285 0.0319 0.0323 0.0288 0.0290 0.0291 0.0293 Tensile strength (kPa) 321 319 324 311 306 322 323 321 320 Limiting oxygen index (%) 32.4 32.7 33.2 30.9 29.8 31.1 32.9 33.0 32.8 Crazing time (h) 418 420 426 423 422 424 380 413 392

[0125] According to the data in Table 1, the rubber and plastic insulation material of the present invention has strong thermal insulation performance, mechanical strength, flame retardancy and anti-aging properties.

[0126] Comparing Example 9 with Comparative Example 1, it can be seen that by replacing the nano-attapulgite powder used with Product 4, namely the coated product with epoxy groups on the surface (attapulgite powder with nano-sized particles coated with molybdenum disulfide nanosheets), the nano-attapulgite powder of the present invention is more conducive to improving the thermal insulation performance, mechanical strength and flame retardancy of rubber and plastic insulation materials.

[0127] Comparing Example 9 with Comparative Example 2, it can be seen that controlling the temperature of the oxygen plasma treatment in step A2 of the preparation process of the nano-attapulgite powder to 180°C, while the temperature of the oxygen plasma treatment in step A2 of the present invention is 115°C, will be more conducive to the preparation of nano-attapulgite powder, thereby better improving the thermal insulation performance, mechanical strength and flame retardancy of rubber and plastic insulation materials.

[0128] Comparing Example 9 with Comparative Example 3, it can be seen that replacing the nano-attapulgite powder used with a mixture of product 5 and ammonium polyphosphate in a mass ratio of 10:3, the nano-attapulgite powder of the present invention is more conducive to improving the flame retardancy of rubber and plastic insulation materials.

[0129] Comparing Example 9 with Comparative Example 4, it can be seen that by replacing the functional additives used with a mixture of product a and product d in a mass ratio of 12:5.5, the functional additives of the present invention are more conducive to improving the anti-aging properties of rubber and plastic insulation materials.

[0130] Comparing Example 9 with Comparative Example 5, it can be seen that by replacing product a in the preparation process of the functional additive with product a-1, product a used in this invention is more conducive to the preparation of the functional additive, thereby helping to improve the anti-aging properties of rubber and plastic insulation materials.

[0131] Comparing Example 9 with Comparative Example 6, it can be seen that by replacing product d in the preparation process of the functional additive with antioxidant 565, the functional additive prepared by product d in this invention helps to improve the anti-aging properties of rubber and plastic insulation materials.

[0132] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A rubber-plastic thermal insulation material based on nano-attapulgite powder, characterized in that: The raw materials include the following parts by weight: 42-56 parts of nitrile rubber, 21-29 parts of polyvinyl chloride, 5-8 parts of foaming agent, 6-10 parts of nano-attapulgite powder, 2-8 parts of functional additives, 1-2 parts of vulcanizing agent, 0.5-1 part of activator, and 5-10 parts of plasticizer.

2. The rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 1, characterized in that: The preparation method of the nano-type attapulgite powder includes the following steps: Step A1: Dry the attapulgite to obtain pretreated attapulgite; ball mill the pretreated attapulgite to obtain product 1. Step A2: Mix thiourea, sodium molybdate, deionized water, and product 1, and carry out a hydrothermal reaction to obtain product 2; treat product 2 with oxygen plasma to obtain product 3. Step A3: Mix KH560, ethanol, and deionized water to prepare a hydrolysate; mix product 3, anhydrous ethanol, and the hydrolysate, and heat to react to obtain product 4; mix product 4, cyano fatty amine, acetonitrile, and DMF, disperse by ultrasonication, add 4-methoxypyridine, and heat to react to obtain product 5. Step A4: Mix product 5, methanol, and DMAC and disperse them by ultrasonication. Add phosphoryl chloride and pyridine, and heat under reflux to obtain nano-sized attapulgite powder.

3. The rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 2, characterized in that: In step A2, the conditions for oxygen plasma treatment are a temperature of 110-115℃, an oxygen flow rate of 20-30 sccm, and a power of 200-300W.

4. The rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 2, characterized in that: In step A3, the ratio of product 4, cyano fatty amine, acetonitrile, DMF, and 4-methoxypyridine is 13-15g: 6-7g: 15-20mL: 55-60mL: 55-65mg; the cyano fatty amine is 6-aminohexanonitrile.

5. The rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 2, characterized in that: In step A4, the ratio of product 5, methanol, DMAC, phosphoryl chloride, and pyridine is 18-20g: 5-10mL: 85-90mL: 7.5-8g: 35-45mg; the phosphoryl chloride is diphenylphosphochloride.

6. The rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 1, characterized in that: The preparation method of the functional additive includes the following steps: Step B1: Disperse nano-titanium dioxide in anhydrous ethanol, ultrasonically disperse and dry to obtain dried nano-titanium dioxide; mix dried nano-titanium dioxide, maleic anhydride and potassium persulfate, react in a protective gas, then centrifuge and wash with anhydrous ethanol, and dry to obtain product a. Step B2: Mix the sulfide-containing fatty alcohol, DMF, and sodium hydroxide solution, add epichlorohydrin, and heat to react and obtain product b; mix product b, diphenylamine compound, triethylamine, and acetone, and react to obtain product c; Step B3: Mix product c, potassium carbonate solution, and dimethyl sulfoxide, stir, and add mixture s dropwise under an ice-water bath. After the addition is complete, heat to room temperature and react to obtain product d. Mix product d, methyl acrylate, emulsifier, dispersant, methanol, and product a, disperse by ultrasonication, add initiator, heat to react, add initiator again, and continue the reaction to obtain functional additive.

7. A rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 6, characterized in that: In step B1, the ratio of the dried nano-titanium dioxide, maleic anhydride, and potassium persulfate is 10-12g: 1-2g: 10-20mg.

8. A rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 6, characterized in that: In step B2, the ratio of the sulfur-containing fatty alcohol, DMF, sodium hydroxide solution, and epichlorohydrin is 5.5-6.5g: 13-15mL: 3-5mL: 5-6g; the sulfur-containing fatty alcohol is 3-methylthiopropanol; the ratio of product b, diphenylamine compound, triethylamine, and acetone is 12-13g: 9.5-10.5g: 55-65mg: 50-60mL; the diphenylamine compound is o-aminodiphenylamine.

9. A method for preparing a rubber-plastic thermal insulation material based on nano-attapulgite powder according to any one of claims 1-8, characterized in that: Includes the following steps: Nitrile rubber, polyvinyl chloride, plasticizer, nano-attapulgite powder, and functional additives are sequentially added to a high-speed mixer and mixed. Then, foaming agent, vulcanizing agent, and activator are added and mixed to obtain a premix. The premix is ​​fed into a twin-screw extruder for melt blending, extrusion, and vulcanization to obtain a rubber-plastic thermal insulation material based on nano-attapulgite powder.

10. The method for preparing a rubber-plastic thermal insulation material based on nano-attapulgite powder according to claim 9, characterized in that: The mixing temperature is 110-120℃ and the time is 15-20 minutes; The temperature control of the twin-screw extruder is as follows: feeding section 160-180℃, compression section 170-190℃, metering section 175-185℃, and die head section 180-200℃; vulcanization temperature is 170-180℃ and time is 5-10 min.