Antistatic elastic belt for photovoltaic industry and preparation method thereof

Abstract

This invention relates to the field of conveying materials technology, specifically disclosing an antistatic elastic belt for the photovoltaic industry and its preparation method; including the following steps: S1: Take silicone rubber microparticles and polyurethane, mix them evenly, heat and pressurize, and extrude to obtain a conveying surface with a thickness of 0.4-0.5 mm; S2: Prepare a skeleton layer: the skeleton layer is woven by warp and weft threads, wherein the weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire and a single polyurethane-coated filament; S3: Add an aqueous solution of polyazidopropylidin crosslinking agent dropwise to carboxylated nitrile rubber latex, add polypyrrole-modified silica, stir to obtain a conductive and wear-resistant slurry, coat it on one side of the skeleton layer, dry it, and the coating thickness is 0.3-0.4 mm; take the conveying surface, attach it to the side of the skeleton layer that is not coated with the conductive and wear-resistant slurry, hot press, and cool to obtain an antistatic elastic belt.

Description

Technical Field

[0001] This invention relates to the field of conveying materials technology, and specifically discloses an antistatic elastic band for the photovoltaic industry and its preparation method. Background Technology

[0002] Solar power generation is pollution-free and noiseless, and its technology is mature, safe and reliable. The photovoltaic industry is a photoelectric conversion industrial chain formed by the application and development of silicon materials, which includes the production of high-purity polycrystalline silicon raw materials and the production of solar cell modules.

[0003] The transport of high-purity polycrystalline silicon wafers is a crucial step in photovoltaic production. Transporting high-purity polycrystalline silicon wafers places high demands on the performance of the conveyor belts, requiring excellent wear resistance and high-temperature resistance to extend their lifespan; they also need good flexibility, ease of cleaning, and antistatic properties to prevent damage to the silicon wafers. Currently available conveyor belts cannot meet these requirements. Therefore, researching a highly clean, flexible, and antistatic elastic belt for transporting high-purity polycrystalline silicon wafers, along with its preparation method, is of great significance. Summary of the Invention

[0004] The purpose of this invention is to provide an antistatic elastic strip for the photovoltaic industry and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing an antistatic elastic band for the photovoltaic industry, comprising the following steps:

[0006] S1: Take silicone rubber microparticles and polyurethane, mix them evenly, heat and pressurize, and extrude to obtain a conveyor surface with a thickness of 0.4-0.5mm;

[0007] S2: Preparation of the skeleton layer: The skeleton layer is woven from warp and weft threads, wherein the weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire with a single polyurethane-coated filament.

[0008] S3: Add the aqueous solution of polyaziridine crosslinking agent dropwise to carboxylated nitrile rubber latex, add polypyrrole modified silica, stir to obtain a conductive and wear-resistant slurry, coat one side of the skeleton layer, dry, and the coating thickness is 0.3-0.4 mm; take the conveying surface, put it into contact with the side of the skeleton layer that is not coated with conductive and wear-resistant slurry, hot press, cool, and obtain an antistatic elastic band.

[0009] Preferably, the specific steps of S1 are as follows: take silicone rubber microparticles and polyurethane, stir at 90-100°C and 50-60 rpm for 4-5 hours, mix evenly, apply 20MPa pressure, heat to 220°C and react for 0.5-1 minutes, and extrude at 220°C to obtain the conveying surface.

[0010] Preferably, the hot pressing process in step S3 is as follows: temperature: 140-150°C, pressure: 0.5-1.0 MPa, time: 5-10 min.

[0011] Preferably, the preparation of the polyurethane includes the following steps: taking castor oil, 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, polytetrahydrofuran ether diol, purging with nitrogen, heating to 60-70°C and stirring for 10-20 min, adding polypyrrole-modified silica, dimethyl biphenyl diisocyanate, and stannous octoate, stirring at 60-70°C for 4-6 h, cooling to 50-60°C, adding triethylamine, and stirring for 10-20 min to obtain polyurethane;

[0012] The polyurethane comprises the following raw materials, by mass parts: 20-30 parts castor oil, 10-20 parts 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 100-150 parts polytetrahydrofuran ether diol, 30-40 parts polypyrrole-modified silica, 80-100 parts dimethyl biphenyl diisocyanate, 0.4-1 part stannous octoate, and 0.4-1 part triethylamine.

[0013] Preferably, the preparation of the polypyrrole modified silica includes the following steps: taking nano silica and water, sonicating for 30-40 min, adding 2-aminopyrrole, stirring in an ice-water bath for 30-40 min, adding ammonium persulfate aqueous solution, stirring in an ice-water bath for 30-40 min, filtering to obtain the solid, washing, and drying to obtain polypyrrole modified silica;

[0014] The polypyrrole-modified silica comprises the following raw materials, by mass parts: 0.01-0.02 parts nano silica, 40-50 parts water, and 0.1-0.2 parts 2-aminopyrrole; the ammonium persulfate aqueous solution comprises the following raw materials, by mass parts: 0.3-0.4 parts ammonium persulfate and 10 parts water.

[0015] Preferably, the preparation of the silicone rubber microparticles includes the following steps: S1: Take fumed silica, dry it, add water, ethanol, vinyl silane coupling agent, and isocyanate silane coupling agent, adjust the pH to 3-5, stir at 90-100℃ for 3-4 hours, filter to take the solid, wash it, dry it, and obtain modified fumed silica.

[0016] S2: Take methyl vinyl silicone rubber, mix it, add modified fumed silica, mix it again, add modified fumed silica, mix it again, add diphenylsilanediol, mix it again, add hydroxyl fluorosilicone oil, iron oxide, and 1-ethynylcyclohexanol, mix it again to obtain a compound; let the compound stand at room temperature for 20-25 hours, pass it through a thin tube and triangular package 8-12 times, add 0.8-1 part of organic peroxide, pass it through a thin tube to form a sheet, calender it to a thickness of 0.3-0.4 mm, vulcanize it, granulate it, and crush it to obtain silicone rubber microparticles with a particle size of 1-3 μm.

[0017] Preferably, the vulcanization is carried out using a drum vulcanizing machine at a pressure of 30 MPa, a temperature of 130°C, and a drum speed of 10 m / min.

[0018] Preferably, the modified fumed silica comprises the following raw materials, by mass parts: 80-100 parts fumed silica, 50-100 parts water, 200-300 parts ethanol, 5-10 parts vinyl silane coupling agent, and 5-10 parts isocyanate-based silane coupling agent; the silicone rubber microparticles comprise the following raw materials, by mass parts: 100 parts methyl vinyl silicone rubber, 40-60 parts modified fumed silica, 5-8 parts diphenylsilanediol, 7-10 parts hydroxyl fluorosilicone oil, 5-8 parts iron oxide, 0.2-0.3 parts 1-ethynylcyclohexanol, and 0.8-1 parts organic peroxide.

[0019] Preferably, in the conveying surface, the mass ratio of silicone rubber particles to polyurethane is 3:(6-7).

[0020] Preferably, the skeleton layer is made of 3 / 1 three-dimensional twill weave with a warp and weft density of 92×60 threads / 2.54cm.

[0021] Preferably, the conductive and wear-resistant slurry comprises the following raw materials, by weight: 1-2 parts of polyaziridine crosslinking agent aqueous solution, 10-15 parts of carboxylated butadiene-acrylonitrile rubber latex, and 2-4 parts of polypyrrole-modified silica; wherein the content of polyaziridine crosslinking agent in the polyaziridine crosslinking agent aqueous solution is 30 wt%.

[0022] Preferably, the nano-silica is of type ML-SiO2-N100, and the specific surface area of ​​the fumed silica is 200±20m². 2 / g.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) Silicone rubber microparticles and polyurethane are mixed in a mass ratio of 3:(6-7), and the mixture is pressurized and heated to make the interior foam, thereby obtaining a wear-resistant and elastic conveyor surface;

[0024] The silicone rubber microparticles include methyl vinyl silicone rubber, modified fumed silica, and diphenylsilanediol, which have excellent adsorption capacity, making them more efficient and safer when transporting thin and easily slippery silicon wafers.

[0025] Modified fumed silica contains vinyl and isocyanate groups, which crosslink with methyl vinyl silicone rubber during vulcanization, improving dispersibility while enhancing the mechanical strength, thermal stability, and chemical stability of silicone rubber. The isocyanate groups also give it good compatibility with polyurethane, which helps in the mixing of silicone rubber particles and polyurethane.

[0026] The polyurethane contains a certain amount of castor oil, 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, and polytetrahydrofuran ether diol. The introduction of castor oil increases the branching of the polyurethane, thereby increasing its elasticity, flexibility, abrasion resistance, and chemical resistance. At the same time, the introduction of castor oil improves the hydrophobicity of the polyurethane, making it easier to clean. 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol reduces the surface energy of the polyurethane, improving its hydrophobicity and self-cleaning properties. Polytetrahydrofuran ether diol has excellent hydrolysis resistance and abrasion resistance. The polyurethane prepared from the above materials has excellent abrasion resistance, flexibility, and self-cleaning properties, exhibiting superior performance.

[0027] Adding polypyrrole-modified silica to polyurethane improves its antistatic properties. Polypyrrole-modified silica is obtained by polymerizing 2-aminopyrrole on the surface of nano-silica and contains amino groups, which have good compatibility with polyurethane.

[0028] (2) The skeleton layer includes polyurethane-coated filaments and metal wires, which have excellent tensile strength and conductivity. A conductive wear-resistant slurry is coated on one side of the skeleton layer as the bottom layer, making the elastic band conductive as a whole and greatly improving its antistatic performance. After coating with the conductive wear-resistant slurry, the conveying surface is taken and bonded to the side of the skeleton layer that is not coated with the conductive wear-resistant slurry. The surface is then hot-pressed to obtain an antistatic elastic band with tight bonding between layers and a long service life. Detailed Implementation

[0029] The following are preferred embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. For those skilled in the art, all other embodiments obtained by those skilled in the art without creative effort without departing from the principles of the embodiments of the present invention are within the scope of protection of the present invention.

[0030] Unless otherwise specified, all the following quantities are parts by weight.

[0031] (I) Preparation method of modified fumed silica: Take 100 parts of fumed silica, dry it in vacuum at 120℃ for 4h, add 80 parts of water, 250 parts of ethanol, 6 parts of vinyl silane coupling agent, and 6 parts of isocyanate silane coupling agent, adjust the pH to 4, stir at 90℃ for 4h, filter to take the solid, wash, and dry to obtain modified fumed silica.

[0032] (II) Preparation method of polypyrrole modified silica: Take 0.02 parts of nano silica and 50 parts of water, sonicate for 30 min, add 0.2 parts of 2-aminopyrrole, stir in an ice water bath for 40 min, add ammonium persulfate aqueous solution (including 0.4 parts of ammonium persulfate and 10 parts of water), stir in an ice water bath for 40 min, filter to obtain solid, wash, dry, and obtain polypyrrole modified silica.

[0033] (III) Preparation method of antistatic elastic band: Example 1: S1: Take 25 parts castor oil, 15 parts 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 130 parts polytetrahydrofuran ether diol, introduce nitrogen gas, heat to 70℃ and stir for 20 min, add 35 parts polypyrrole modified silica, 100 parts dimethyl biphenyl diisocyanate and 0.8 parts stannous octoate, stir at 70℃ for 6 h, cool to 50℃, add 0.8 parts triethylamine, stir for 15 min to obtain polyurethane;

[0034] S2: Take 100 parts of methyl vinyl silicone rubber, mix at 40℃ for 30s, add 20 parts of modified fumed silica, mix at 40℃ for 1min, add 25 parts of modified fumed silica, mix at 40℃ for 1min, add 6 parts of diphenylsilanediol, mix at 40℃ for 2min, add 8 parts of hydroxyl fluorosilicone oil, 6 parts of iron oxide, and 0.2 parts of 1-ethynylcyclohexanol, mix until the temperature reaches 60℃ to obtain a compound; let the compound stand at room temperature for 24h, place it in a two-roll mill for thin passing and triangular wrapping 10 times, add 0.8 parts of organic peroxide, thin pass to sheet, calender to a thickness of 0.3mm, vulcanize, granulate, and crush to obtain silicone rubber microparticles with a particle size of 2μm;

[0035] S3: Take silicone rubber microparticles and polyurethane, add them to a high-speed mixer in a ratio of 3:7, stir at 60 rpm for 5 hours at 100℃, mix evenly, react at 20MPa pressure and 220℃ for 1 minute, and extrude at 220℃ to obtain a conveyor surface with a thickness of 0.4mm.

[0036] S4: Preparation of the skeleton layer: The skeleton layer is woven from warp and weft threads. The weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire and a single polyurethane-coated filament. The warp and weft density is 92×60 threads / 2.54cm, and a 3 / 1 three-dimensional twill weave is used.

[0037] S5: Add 2 parts of polyaziridine crosslinking agent aqueous solution to 12 parts of carboxylated nitrile rubber latex, add 3 parts of polypyrrole modified silica, stir at 80℃ for 3h to obtain conductive wear-resistant slurry, coat it on one side of the skeleton layer, dry it, and the coating thickness is 0.4mm.

[0038] S6: Take the conveying surface and bond it to the side of the skeleton layer that is not coated with conductive wear-resistant slurry. Hot press at 145℃ and 0.5MPa for 10 minutes. Cool to obtain an antistatic elastic band.

[0039] Example 2: S1: Take 30 parts castor oil, 20 parts 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 100 parts polytetrahydrofuran ether diol, purge with nitrogen, heat to 70°C and stir for 20 min, add 40 parts polypyrrole-modified silica, 100 parts dimethyl biphenyl diisocyanate and 0.8 parts stannous octoate, stir at 70°C for 6 h, cool to 50°C, add 0.8 parts triethylamine, stir for 15 min to obtain polyurethane;

[0040] S2: Take 100 parts of methyl vinyl silicone rubber, mix at 40℃ for 30s, add 30 parts of modified fumed silica, mix at 40℃ for 1min, add 20 parts of modified fumed silica, mix at 40℃ for 1min, add 6 parts of diphenylsilanediol, mix at 40℃ for 2min, add 8 parts of hydroxyl fluorosilicone oil, 6 parts of iron oxide, and 0.2 parts of 1-ethynylcyclohexanol, mix until the temperature reaches 60℃ to obtain a compound; let the compound stand at room temperature for 24h, place it in a two-roll mill for thin passing and triangular wrapping 10 times, add 0.8 parts of organic peroxide, thin pass to sheet, calender to a thickness of 0.3mm, vulcanize, granulate, and crush to obtain silicone rubber microparticles with a particle size of 2μm;

[0041] S3: Take silicone rubber microparticles and polyurethane, add them to a high-speed mixer in a ratio of 3:6, stir at 60 rpm for 5 hours at 100℃, mix evenly, react at 20MPa pressure and 220℃ for 1 minute, and extrude to obtain a conveyor surface with a thickness of 0.4mm.

[0042] S4: Preparation of the skeleton layer: The skeleton layer is woven from warp and weft threads. The weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire and a single polyurethane-coated filament. The warp and weft density is 92×60 threads / 2.54cm, and a 3 / 1 three-dimensional twill weave is used.

[0043] S5: Add 2 parts of polyaziridine crosslinking agent aqueous solution to 12 parts of carboxylated nitrile rubber latex, add 3 parts of polypyrrole modified silica, stir at 80℃ for 3h to obtain conductive wear-resistant slurry, coat it on one side of the skeleton layer, dry it, and the coating thickness is 0.4mm.

[0044] S6: Take the conveying surface and bond it to the side of the skeleton layer that is not coated with conductive wear-resistant slurry. Hot press at 145℃ and 0.5MPa for 10 minutes. Cool to obtain an antistatic elastic band.

[0045] Example 3: S1: Take 20 parts castor oil, 10 parts 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 150 parts polytetrahydrofuran ether diol, purge with nitrogen, heat to 70°C and stir for 20 min, add 30 parts polypyrrole-modified silica, 100 parts dimethyl biphenyl diisocyanate and 0.8 parts stannous octoate, stir at 70°C for 6 h, cool to 50°C, add 0.8 parts triethylamine, stir for 15 min to obtain polyurethane;

[0046] S2: Take 100 parts of methyl vinyl silicone rubber, mix at 40℃ for 30s, add 20 parts of modified fumed silica, mix at 40℃ for 1min, add 30 parts of modified fumed silica, mix at 40℃ for 1min, add 6 parts of diphenylsilanediol, mix at 40℃ for 2min, add 8 parts of hydroxyl fluorosilicone oil, 6 parts of iron oxide, and 0.2 parts of 1-ethynylcyclohexanol, mix until the temperature reaches 60℃ to obtain a compound; let the compound stand at room temperature for 24h, place it in a two-roll mill for thin passing and triangular wrapping 10 times, add 0.8 parts of organic peroxide, thin pass to sheet, calender to a thickness of 0.3mm, vulcanize, granulate, and crush to obtain silicone rubber microparticles with a particle size of 2μm;

[0047] S3: Take silicone rubber microparticles and polyurethane, add them to a high-speed mixer in a ratio of 3:7, stir at 60 rpm for 5 hours at 100℃, mix evenly, react at 20MPa pressure and 220℃ for 1 minute, and extrude at 220℃ to obtain a conveyor surface with a thickness of 0.4mm.

[0048] S4: Preparation of the skeleton layer: The skeleton layer is woven from warp and weft threads. The weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire and a single polyurethane-coated filament. The warp and weft density is 92×60 threads / 2.54cm, and a 3 / 1 three-dimensional twill weave is used.

[0049] S5: Add 2 parts of polyaziridine crosslinking agent aqueous solution to 12 parts of carboxylated nitrile rubber latex, add 3 parts of polypyrrole modified silica, stir at 80℃ for 3h to obtain conductive wear-resistant slurry, coat it on one side of the skeleton layer, dry it, and the coating thickness is 0.4mm.

[0050] S6: Take the conveying surface and bond it to the side of the skeleton layer that is not coated with conductive wear-resistant slurry. Hot press at 145℃ and 0.5MPa for 10 minutes. Cool to obtain an antistatic elastic band.

[0051] Comparative Example 1: The preparation method of polyurethane was changed, while the remaining steps were the same as in Example 1. The preparation method of polyurethane included the following steps: 10 parts of castor oil, 5 parts of 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 150 parts of polytetrahydrofuran ether diol were taken, nitrogen gas was introduced, the temperature was raised to 70°C and stirred for 20 min, 35 parts of nano-silica, 100 parts of dimethyl biphenyl diisocyanate, and 0.8 parts of stannous octoate were added, the mixture was stirred at 70°C for 6 h, the temperature was lowered to 50°C, 0.8 parts of triethylamine were added, and the mixture was stirred for 15 min to obtain polyurethane.

[0052] Comparative Example 2: Fumed silica was used instead of modified fumed silica, and the remaining steps were the same as in Example 1: S1: Take 25 parts castor oil, 15 parts 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 130 parts polytetrahydrofuran ether diol, purge with nitrogen, heat to 70°C and stir for 20 min, add 35 parts polypyrrole modified silica, 100 parts dimethyl biphenyl diisocyanate, and 0.8 parts stannous octoate, stir at 70°C for 6 h, cool to 50°C, add 0.8 parts triethylamine, stir for 15 min, and obtain polyurethane;

[0053] S2: Take 100 parts of methyl vinyl silicone rubber, mix at 40℃ for 30s, add 20 parts of fumed silica, mix at 40℃ for 1min, add 25 parts of fumed silica, mix at 40℃ for 1min, add 6 parts of diphenylsilanediol, mix at 40℃ for 2min, add 8 parts of hydroxyl fluorosilicone oil, 6 parts of iron oxide, and 0.2 parts of 1-ethynylcyclohexanol, mix until the temperature reaches 60℃ to obtain a compound; let the compound stand at room temperature for 24h, place it in a two-roll mill for thin passing and triangular wrapping 10 times, add 0.8 parts of organic peroxide, thin pass to sheet, calender to a thickness of 0.3mm, vulcanize, granulate, and crush to obtain silicone rubber microparticles with a particle size of 2μm;

[0054] S3: Take silicone rubber microparticles and polyurethane, add them to a high-speed mixer in a ratio of 3:7, stir at 60 rpm for 5 hours at 100℃, mix evenly, react at 20MPa pressure and 220℃ for 1 minute, and extrude at 220℃ to obtain a conveyor surface with a thickness of 0.4mm.

[0055] S4: Preparation of the skeleton layer: The skeleton layer is woven from warp and weft threads. The weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire and a single polyurethane-coated filament. The warp and weft density is 92×60 threads / 2.54cm, and a 3 / 1 three-dimensional twill weave is used.

[0056] S5: Add 2 parts of polyaziridine crosslinking agent aqueous solution to 12 parts of carboxylated nitrile rubber latex, add 3 parts of polypyrrole modified silica, stir at 80℃ for 3h to obtain conductive wear-resistant slurry, coat it on one side of the skeleton layer, dry it, and the coating thickness is 0.4mm.

[0057] S6: Take the conveying surface and bond it to the side of the skeleton layer that is not coated with conductive wear-resistant slurry. Hot press at 145℃ and 0.5MPa for 10 minutes. Cool to obtain an antistatic elastic band.

[0058] Comparative Example 3: The amounts of silicone rubber microparticles and polyurethane added were changed, and the remaining steps were the same as in Example 1; the mass ratio of silicone rubber microparticles to polyurethane was 1:9: S1: Take 25 parts of castor oil, 15 parts of 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 130 parts of polytetrahydrofuran ether diol, purge with nitrogen, heat to 70°C and stir for 20 min, add 35 parts of polypyrrole-modified silica, 100 parts of dimethyl biphenyl diisocyanate and 0.8 parts of stannous octoate, stir at 70°C for 6 h, cool to 50°C, add 0.8 parts of triethylamine, stir for 15 min to obtain polyurethane;

[0059] S2: Take 100 parts of methyl vinyl silicone rubber, mix at 40℃ for 30s, add 20 parts of modified fumed silica, mix at 40℃ for 1min, add 25 parts of modified fumed silica, mix at 40℃ for 1min, add 6 parts of diphenylsilanediol, mix at 40℃ for 2min, add 8 parts of hydroxyl fluorosilicone oil, 6 parts of iron oxide, and 0.2 parts of 1-ethynylcyclohexanol, mix until the temperature reaches 60℃ to obtain a compound; let the compound stand at room temperature for 24h, place it in a two-roll mill for thin passing and triangular wrapping 10 times, add 0.8 parts of organic peroxide, thin pass to sheet, calender to a thickness of 0.3mm, vulcanize, granulate, and crush to obtain silicone rubber microparticles with a particle size of 2μm;

[0060] S3: Take silicone rubber microparticles and polyurethane, add them to a high-speed mixer in a ratio of 1:9, stir at 60 rpm for 5 hours at 100℃, mix evenly, react at 20MPa pressure and 220℃ for 1 minute, and extrude at 220℃ to obtain a conveyor surface with a thickness of 0.4mm.

[0061] S4: Preparation of the skeleton layer: The skeleton layer is woven from warp and weft threads. The weft thread is a single polyurethane-coated filament, and the warp thread is obtained by twisting a single metal wire and a single polyurethane-coated filament. The warp and weft density is 92×60 threads / 2.54cm, and a 3 / 1 three-dimensional twill weave is used.

[0062] S5: Add 2 parts of polyaziridine crosslinking agent aqueous solution to 12 parts of carboxylated nitrile rubber latex, add 3 parts of polypyrrole modified silica, stir at 80℃ for 3h to obtain conductive wear-resistant slurry, coat it on one side of the skeleton layer, dry it, and the coating thickness is 0.4mm.

[0063] S6: Take the conveying surface and bond it to the side of the skeleton layer that is not coated with conductive wear-resistant slurry. Hot press at 145℃ and 0.5MPa for 10 minutes. Cool to obtain an antistatic elastic band.

[0064] Unless otherwise specified, the experimental methods used in the above embodiments are conventional methods; the raw materials used, unless otherwise specified, are all commercially available, and their sources are as follows: ethanol (CAS: 64-17-5); dicumyl peroxide (CAS: 80-43-3); triethylamine (CAS: 121-44-8); fumed silica (IOTA). HL4200 (Anhui Aiyota Silicone Oil Co., Ltd.); Vinyl silane coupling agent (CAS: 2768-02-7); Isocyanate-based silane coupling agent (CAS: 78450-75-6); Nano-silica (ML-SiO2-N100, Zhejiang Manli Nanotechnology Co., Ltd.); 2-Aminopyrrole (CAS: 4458-15-5); Ammonium persulfate (CAS: 7727-54-0); Castor oil (S24344, Shanghai Yuanye); 2'-Fluoro-[1,1':4',1"-Triphenyl]-2,6-diol (CAS: 2033132-94-2); Polytetrahydrofuran ether diol (Dixin Chemical 01, Zhongshan Dixin Chemical Co., Ltd.); Dimethyl biphenyl diisocyanate (CAS: 91 -97-4); Stannous octoate (CAS: 301-10-0); Methyl vinyl silicone rubber (Item No.: 88888, Dongguan Bailing New Materials Co., Ltd.); Diphenylsilanediol (CAS: 947-42-2); Hydroxyfluorosilicone oil (A148561, Zhengzhou Alpha Chemical Co., Ltd.); Iron oxide (S24050, Shanghai Yuanye); 1-Ethynylcyclohexanol (CAS: 78-27-3); Polyurethane coated yarn (PTPU030, Shaoxing Xineng Textile Technology Co., Ltd.); Metal wire (copper wire, JSS-1, Shaoxing Xineng Textile Technology Co., Ltd.); Polyaziridinium crosslinking agent (XR-100, Tesco Chemical); Carboxylated nitrile rubber latex (Item No.: 5541254, Dongguan Shenghao Plastic Raw Materials Co., Ltd.).

[0065] Experiment: Take the antistatic elastic bands prepared in Examples 1-3 and Comparative Examples 1-4, (1) prepare a 250×25mm sample, and test its tensile strength and 1% elongation at 25℃ and 65% relative humidity; (2) test the water contact angle using a water contact angle tester; (3) measure the surface resistance; see the table below for specific data;

[0066]

[0067]

[0068] Conclusions: According to Comparative Example 1 above, changing the preparation method of polyurethane, reducing the amount of castor oil and 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol significantly decreased performance. Therefore, the preparation method of polyurethane is of great importance. In Comparative Example 2, replacing modified fumed silica with fumed silica also resulted in decreased performance due to reduced compatibility. In Comparative Example 3, changing the amount of silicone rubber particles and polyurethane, with a mass ratio of silicone rubber particles to polyurethane of 1:9, significantly reduced tensile strength and 1% elongation. In summary, the antistatic elastic band prepared by this invention possesses excellent elasticity, tensile strength, antistatic properties, and self-cleaning properties, making it suitable for conveying high-purity polycrystalline silicon wafers.

[0069] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the spirit and principles of the present invention and within the technical scope disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preparing an antistatic elastic band for the photovoltaic industry, characterized by: It comprises the following steps: S1: take the silicone rubber particles, polyurethane, mix evenly, warm and press, extrude, get the delivery surface with a thickness of 0.4~0.5mm; S2: preparation of the skeleton layer: the skeleton layer is woven by warp and weft, the weft is single polyurethane coated wire, the warp is twisted by single metal wire and single polyurethane coated wire; S3: add the polyvinylidene crosslinking agent aqueous solution to the carboxyl nitrile rubber latex, add the polypyrrole modified white carbon black, stir, get the conductive wear-resistant slurry, coat on one side of the skeleton layer, dry, as the bottom layer, the coating thickness is 0.3~0.4mm; take the delivery surface, and the side of the skeleton layer which is not coated with the conductive wear-resistant slurry, paste, hot-press, cool, get the antistatic elastic belt; The preparation of the polyurethane comprises the following steps: Take castor oil, 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, polytetrahydrofuran ether diol, nitrogen, stir for 10~20min, add poly-pyrrole modified white carbon black, dimethyl diphenyl diisocyanate, stannous octoate, stir for 4~6h at 60~70℃, cool to 50~60℃, add triethylamine, stir for 10~20min, get the polyurethane; the polyurethane comprises the following raw materials, by mass fraction: 20~30 parts of castor oil, 10~20 parts of 2'-fluoro-[1,1':4',1"-terphenyl]-2,6-diol, 100~150 parts of polytetrahydrofuran ether diol, 30~40 parts of poly-pyrrole modified white carbon black, 80~100 parts of dimethyl diphenyl diisocyanate, 0.4~1 part of stannous octoate, 0.4~1 part of triethylamine; The preparation of the silicone rubber particles It comprises the following steps: S1: take fumed silica, dry, add water, ethanol, vinyl silane coupling agent, isocyanate silane coupling agent, adjust pH to 3~5, stir for 3~4h at 90~100℃, filter the solid, wash, dry, get the modified fumed silica; S2: take methyl vinyl silicone rubber, mix, add modified fumed silica, mix, add modified fumed silica, mix, add diphenylsilanediol, mix, add hydroxyl fluorosilicone oil, iron oxide, 1-ethynylcyclohexanol, mix, get the mixing rubber; the mixing rubber is placed at room temperature for 20~25h, thin pass and triangle bag 8~12 times, add 0.8~1 parts of organic peroxide, thin pass out sheet, calender to a thickness of 0.3~0.4mm thin rubber sheet, vulcanize, cut into particles, crush, get the silicone rubber particles with a particle size of 1~3μm; In the delivery surface, the mass ratio of silicone rubber particles to polyurethane is 3: (6~7).

2. A process for the preparation of an antistatic elastic belt for the photovoltaic industry according to claim 1, characterized in that: The preparation of the poly-pyrrole modified white carbon black comprises the following steps: Take nano white carbon black, water, ultrasonic for 30~40min, add 2-aminopyrrole, stir in ice water bath for 30~40min, add ammonium persulfate aqueous solution, stir in ice water bath for 30~40min, filter the solid, wash, dry, get the poly-pyrrole modified white carbon black; The polypyrrole modified white carbon black comprises the following raw materials in parts by mass: 0.01-0.02 parts of nano white carbon black, 40-50 parts of water, and 0.1-0.2 parts of 2-aminopyrrole; the ammonium persulfate aqueous solution comprises the following raw materials in parts by mass: 0.3-0.4 parts of ammonium persulfate and 10 parts of water.

3. A method of preparing an antistatic elastic belt for a photovoltaic industry according to claim 1, characterized in that: The modified fumed white carbon black comprises the following raw materials in parts by mass: 80-100 parts of fumed white carbon black, 50-100 parts of water, 200-300 parts of ethanol, 5-10 parts of vinyl silane coupling agent, and 5-10 parts of isocyanate silane coupling agent; the silicone rubber microparticle comprises the following raw materials in parts by mass: 100 parts of methyl vinyl silicone rubber, 40-60 parts of modified fumed white carbon black, 5-8 parts of diphenylsilanediol, 7-10 parts of hydroxyl fluorosilicone oil, 5-8 parts of iron oxide, 0.2-0.3 parts of 1-ethynylcyclohexanol, and 0.8-1 part of organic peroxide.

4. The method for preparing an antistatic elastic band for the photovoltaic industry according to claim 1, characterized in that: The skeleton layer is woven by 3 / 1 twill, and the warp and weft density is 92x60 threads / 2.54 cm.

5. A method of manufacturing an antistatic elastic belt for a photovoltaic industry according to claim 1, characterized in that: The conductive wear-resistant paste comprises the following raw materials in parts by mass: 1-2 parts of polyaziridine crosslinking agent aqueous solution, 10-15 parts of carboxyl nitrile rubber latex, and 2-4 parts of polypyrrole modified white carbon black; the content of polyaziridine crosslinking agent in the polyaziridine crosslinking agent aqueous solution is 30wt%.

6. The method for preparing an antistatic elastic band for the photovoltaic industry according to claim 1, characterized in that: The hot pressing process in S3 is as follows: temperature: 140-150℃, pressure: 0.5-1.0 MPa, and time: 5-10 min.

7. The antistatic elastic belt for photovoltaic industry prepared by the preparation method of the antistatic elastic belt according to any one of claims 1-6.

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