A corrosion-resistant PE board and its preparation method

Abstract

The invention discloses a corrosion-resistant PE plate and a preparation method thereof. The corrosion-resistant PE plate comprises the following raw materials in parts by weight: 80-100 parts of PE masterbatch, 8-10 parts of a modifying additive, 20-30 parts of a modified filler, 8-10 parts of 1,3-bis(aminopropyl)tetramethyldisiloxane, 0.5-0.8 parts of dicumyl peroxide, and 0.5-1 parts of 2-ethyl-4-methylimidazole. When the raw materials are melt-blended, the modifying additive can be grafted onto PE molecular chains, so that side chains of the PE molecular chains contain epoxy groups, and amino groups on the 1,3-bis(aminopropyl)tetramethyldisiloxane can react with epoxy groups on the side chains of the PE molecular chains and epoxy groups on the modified filler, thereby forming a cross-linked grid. Meanwhile, an organosilicon segment containing a long-chain fluoroalkyl group is embedded in the grid, thereby extending the penetration path of the corrosive medium, so that the prepared PE plate has good corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of PE material preparation, and in particular to a corrosion-resistant PE plate and a preparation method thereof. Background Art

[0002] Polyethylene sheet is a versatile material widely used in a variety of fields, including construction, packaging, and agriculture. It possesses excellent physical properties, such as good toughness, high resistance to environmental stress cracking, and outstanding chemical stability. Polyethylene sheet not only offers excellent weathering and corrosion resistance, but is also widely popular due to its lightweight and easy processing properties. These advantages make polyethylene sheet an indispensable material in numerous industries. However, it is still susceptible to corrosion in certain environments, such as high humidity, strong acids and bases, or saltwater. This corrosion not only affects the material's appearance but can also compromise the safety of structures. Therefore, developing a PE material that is more stable and corrosion-resistant in these environments is crucial. Summary of the Invention

[0003] The purpose of the present invention is to provide a corrosion-resistant PE plate and a preparation method thereof, which solves the problem that the mechanical properties of the PE plate will be significantly reduced due to corrosion in extreme environments at present.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a corrosion-resistant PE board specifically comprises the following steps:

[0006] Step A1: 6-maleimidocaproic acid, ethylene glycolamine, dicyclohexylcarbodiimide, and toluene are mixed and reacted at a speed of 120-150 r / min and a temperature of 20-25° C. for 3-5 hours to obtain an intermediate. The intermediate, epichlorohydrin, boron trifluoride etherate, and DMF are uniformly mixed and reacted at a speed of 150-200 r / min and a temperature of 65-70° C. for 2-3 hours. After that, sodium hydroxide solution is added, the temperature is raised to 75-80° C., and the reaction is continued for 3-4 hours to obtain a modified additive.

[0007] Step A2: Weigh the following raw materials in parts by weight: 80-100 parts of PE masterbatch, 8-10 parts of modified additives, 20-30 parts of modified fillers, 8-10 parts of 1,3-bis(aminopropyl)tetramethyldisiloxane, 0.5-0.8 parts of dicumyl peroxide, and 0.5-1 parts of 2-ethyl-4-methylimidazole. Add the raw materials into a twin-screw extruder, and melt-extrude the extruded materials under the conditions of a first zone temperature of 150-160° C., a second zone temperature of 170-180° C., a third zone temperature of 180-190° C., and a die head temperature of 190-200° C., and then compression mold and cool to produce a corrosion-resistant PE sheet.

[0008] Furthermore, the molar ratio of 6-maleimidocaproic acid, ethylene glycolamine and dicyclohexylcarbodiimide in step A1 is 1:1:1.1, the amount ratio of the intermediate, epichlorohydrin, boron trifluoride etherate and sodium hydroxide solution is 30 mmol:60 mmol:0.9 g:7 mL, and the mass fraction of the sodium hydroxide solution is 25%.

[0009] Furthermore, the modified filler is prepared by the following steps:

[0010] Step B1: dispersing graphene oxide in deionized water, stirring and adding ammonium fluorotitanate solution and boric acid solution at a speed of 200-300 r / min and a temperature of 25-30°C, heating to 180-185°C, and reacting for 6-8 hours to obtain fluorinated graphene; dispersing fluorinated graphene in deionized water, stirring and adding KH570, ethanol and acetic acid at a speed of 150-200 r / min and a temperature of 60-70°C, and reacting for 5-7 hours to obtain modified graphene;

[0011] Step B2: The modified graphene, trichlorosilane, chloroplatinic acid and DMF are mixed uniformly, nitrogen protection is introduced, and the reaction is carried out at a speed of 150-200 r / min and a temperature of 70-80°C for 6-8 hours to obtain functionalized graphene; tetramethyltetrasiloxane, 3,4-epoxy-1-butene, chloroplatinic acid and DMF are mixed uniformly, nitrogen protection is introduced, and the reaction is carried out at a speed of 150-200 r / min and a temperature of 70-80°C for 3-5 hours to obtain a modified monomer;

[0012] Step B3: lithium dimethylvinylsiliconol and tetrahydrofuran are mixed, nitrogen is introduced, and the modified monomer is added under stirring at a speed of 120-150 r / min and a temperature of 25-30°C. The reaction is carried out for 6-8 hours, and then modified graphene is added. The reaction is continued for 2-3 hours to obtain a precursor. Dodecafluoroheptanol, mercaptosuccinic acid, and toluene are mixed uniformly. Under the conditions of a speed of 150-200 r / min and a temperature of 100-110°C, p-toluenesulfonic acid is added to a pH of 1.5, and the reaction is carried out for 3-5 hours to obtain a modifier.

[0013] Step B4: The precursor, modifier, benzophenone and DMF were mixed evenly, and reacted for 20-30 minutes at a speed of 120-150 r / min, a temperature of 30-40° C. and irradiation with 365 nm ultraviolet light to obtain a modified filler.

[0014] Furthermore, the amount ratio of graphene oxide, deionized water, ammonium fluorotitanate solution and boric acid solution in step B1 is 5 mg:3 mL:1 mL:1 mL, the concentration of ammonium fluorotitanate is 50 mg / mL, the concentration of boric acid solution is 10 mg / mL, and the amount ratio of fluorinated graphene, deionized water, KH570, ethanol and acetic acid is 100 mg:50 mL:160 mg:10 mL:1 mL.

[0015] Furthermore, the molar ratio of the double bonds on the modified graphene and trichlorosilane in step B2 is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, the molar ratio of tetramethyltetrasiloxane and 3,4-epoxy-1-butene is 1:4, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyltetrasiloxane.

[0016] Furthermore, the amount ratio of lithium dimethylvinylsiliconol, modified monomer and modified graphene described in step B3 is 2mmol:8mmol:10mg, and the molar ratio of dodecafluoroheptanol and mercaptosuccinic acid is 2:1.

[0017] Furthermore, the molar ratio of the double bond on the precursor and the modifier in step B4 is 1:1, and the amount of benzophenone used is 1% by weight of the modifier.

[0018] Beneficial effects of the present invention: A corrosion-resistant PE board disclosed in the present invention comprises the following raw materials: PE masterbatch, a modifying additive, a modified filler, 1,3-bis(aminopropyl)tetramethyldisiloxane, diisopropylbenzene peroxide and 2-ethyl-4-methylimidazole. The raw materials are melted and extruded, and then compression molded and cooled to obtain the corrosion-resistant PE board. The modifying additive uses 6-maleimidocaproic acid and ethylene glycolamine as raw materials, so that the carboxyl group on the 6-maleimidocaproic acid and the secondary amine on the ethylene glycolamine undergo a dehydration reaction to obtain an intermediate. The intermediate is reacted with epichlorohydrin so that the hydroxyl group on the intermediate reacts with the epoxy group on the epichlorohydrin. Then, the ring is closed under the action of a sodium hydroxide solution to form a new epoxy group to obtain the modifying additive.

[0019] Modified graphene is prepared by treating graphene oxide with ammonium fluorotitanate solution and boric acid solution to obtain fluorinated graphene, treating the fluorinated graphene with KH570 to graft double bonds on the surface to obtain modified graphene, reacting the modified graphene with trichlorosilane to react the double bonds on the modified graphene with the Si-H bonds on the trichlorosilane to obtain functionalized graphene, reacting tetramethyltetrasiloxane with 3,4-epoxy-1-butene to react the Si-H bonds on the tetramethyltetrasiloxane with the double bonds on the 3,4-epoxy-1-butene , a modified monomer is prepared, lithium dimethylsilane is used as an initiator, the modified monomer is a polymerized monomer ring-opening polymerization, and then functionalized graphene is added, so that the chlorine atom sites on the functionalized graphene react with lithium silane to prepare a precursor, dodecafluoroheptanol and mercaptosuccinic acid are reacted, so that the hydroxyl group on dodecafluoroheptanol and the carboxyl group on mercaptosuccinic acid are esterified to prepare a modifier, the precursor and the modifier are irradiated with ultraviolet light under the action of benzophenone, so that the double bond on the precursor reacts with the thiol group on the modifier to prepare a modified filler.

[0020] During the melt blending of the raw materials, the maleimide structure on the modified additive can be grafted onto the PE molecular chain under the action of diisopropylbenzene peroxide, so that the side chain of the PE molecular chain contains epoxy groups. Then, under the action of 2-ethyl-4-methylimidazole, the amino group on 1,3-bis(aminopropyl)tetramethyldisiloxane can react with the epoxy groups on the side chains of the PE molecular chain and the epoxy groups on the modified filler to form a cross-linked grid. At the same time, organic silicon segments containing long-chain fluoroalkyl groups are embedded in the grid. The modified filler can form a dense physical barrier in the PE matrix, thereby extending the penetration path of the corrosive medium, so that the prepared PE board has excellent corrosion resistance. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] Example 1, a method for preparing a corrosion-resistant PE plate, specifically comprising the following steps:

[0023] Step A1: 6-maleimidocaproic acid, ethylene glycolamine, dicyclohexylcarbodiimide, and toluene are mixed and reacted at a speed of 120 r / min and a temperature of 20° C. for 3 hours to obtain an intermediate. The intermediate, epichlorohydrin, boron trifluoride etherate, and DMF are uniformly mixed and reacted at a speed of 150 r / min and a temperature of 65° C. for 2 hours. After that, sodium hydroxide solution is added, the temperature is raised to 75° C., and the reaction is continued for 3 hours to obtain a modified additive.

[0024] Step A2: Weigh the following raw materials in parts by weight: 80 parts of PE masterbatch, 8 parts of modified additive, 20 parts of modified filler, 8 parts of 1,3-bis(aminopropyl)tetramethyldisiloxane, 0.5 parts of dicumyl peroxide, and 0.5 parts of 2-ethyl-4-methylimidazole. Add the raw materials into a twin-screw extruder, and melt-extrude the extruder under the conditions of a zone 1 temperature of 150°C, a zone 2 temperature of 170°C, a zone 3 temperature of 180°C, and a die head temperature of 190°C. The extruder is then compression-molded and cooled to produce a corrosion-resistant PE sheet.

[0025] The molar ratio of 6-maleimidocaproic acid, ethylene glycolamine, and dicyclohexylcarbodiimide described in step A1 is 1:1:1.1, the amount ratio of the intermediate, epichlorohydrin, boron trifluoride etherate, and sodium hydroxide solution is 30 mmol:60 mmol:0.9 g:7 mL, and the mass fraction of the sodium hydroxide solution is 25%.

[0026] The model of PE masterbatch is LDPE 2420H.

[0027] The modified filler is prepared by the following steps:

[0028] Step B1: dispersing graphene oxide in deionized water, stirring at a speed of 200 r / min and a temperature of 25°C, adding ammonium fluorotitanate solution and boric acid solution, heating to 180°C, and reacting for 6 hours to obtain fluorinated graphene; dispersing fluorinated graphene in deionized water, stirring at a speed of 150 r / min and a temperature of 60°C, adding KH570, ethanol and acetic acid, and reacting for 5 hours to obtain modified graphene;

[0029] Step B2: The modified graphene, trichlorosilane, chloroplatinic acid and DMF were mixed uniformly, nitrogen was introduced for protection, and the reaction was carried out at a speed of 150 r / min and a temperature of 70°C for 6 hours to obtain functionalized graphene. Tetramethyltetrasiloxane, 3,4-epoxy-1-butene, chloroplatinic acid and DMF were mixed uniformly, nitrogen was introduced for protection, and the reaction was carried out at a speed of 150 r / min and a temperature of 70°C for 3 hours to obtain a modified monomer;

[0030] Step B3: lithium dimethylvinylsiliconol and tetrahydrofuran were mixed, nitrogen was introduced for protection, and the modified monomer was added under stirring at a speed of 120 r / min and a temperature of 25°C. After reacting for 6 hours, modified graphene was added and the reaction was continued for 2 hours to obtain a precursor. Dodecafluoroheptanol, mercaptosuccinic acid and toluene were mixed uniformly, and p-toluenesulfonic acid was added under stirring at a speed of 150 r / min and a temperature of 100°C until the pH value was 1.5. The reaction was carried out for 3 hours to obtain a modifier;

[0031] Step B4: The precursor, modifier, benzophenone and DMF were mixed evenly, and reacted for 20 minutes at a speed of 120 r / min, a temperature of 30° C. and irradiation with 365 nm ultraviolet light to obtain a modified filler.

[0032] The amount ratio of graphene oxide, deionized water, ammonium fluorotitanate solution and boric acid solution in step B1 is 5 mg:3 mL:1 mL:1 mL, the concentration of ammonium fluorotitanate is 50 mg / mL, the concentration of boric acid solution is 10 mg / mL, and the amount ratio of fluorinated graphene, deionized water, KH570, ethanol and acetic acid is 100 mg:50 mL:160 mg:10 mL:1 mL.

[0033] The molar ratio of the double bond on the modified graphene described in step B2 to trichlorosilane is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, the molar ratio of tetramethyltetrasiloxane to 3,4-epoxy-1-butene is 1:4, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyltetrasiloxane.

[0034] The amount ratio of lithium dimethylvinylsiliconol, modified monomer and modified graphene described in step B3 is 2mmol:8mmol:10mg, and the molar ratio of dodecafluoroheptanol and mercaptosuccinic acid is 2:1.

[0035] The molar ratio of the double bond on the precursor and the modifier in step B4 is 1:1, and the amount of benzophenone used is 1% by weight of the modifier.

[0036] Example 2, a method for preparing a corrosion-resistant PE plate, specifically comprising the following steps:

[0037] Step A1: 6-maleimidocaproic acid, ethylene glycolamine, dicyclohexylcarbodiimide, and toluene are mixed and reacted at a speed of 120 r / min and a temperature of 25° C. for 4 hours to obtain an intermediate. The intermediate, epichlorohydrin, boron trifluoride etherate, and DMF are uniformly mixed and reacted at a speed of 150 r / min and a temperature of 70° C. for 2 hours. After that, sodium hydroxide solution is added, the temperature is raised to 80° C., and the reaction is continued for 3 hours to obtain a modified additive.

[0038] Step A2: Weigh the following raw materials in parts by weight: 90 parts of PE masterbatch, 9 parts of modified additive, 25 parts of modified filler, 9 parts of 1,3-bis(aminopropyl)tetramethyldisiloxane, 0.6 parts of dicumyl peroxide, and 0.8 parts of 2-ethyl-4-methylimidazole. Add the raw materials into a twin-screw extruder, and melt-extrude the extruder under the conditions of a zone 1 temperature of 155°C, a zone 2 temperature of 175°C, a zone 3 temperature of 185°C, and a die head temperature of 195°C. The extruder is then compression-molded and cooled to produce a corrosion-resistant PE sheet.

[0039] The molar ratio of 6-maleimidocaproic acid, ethylene glycolamine, and dicyclohexylcarbodiimide described in step A1 is 1:1:1.1, the amount ratio of the intermediate, epichlorohydrin, boron trifluoride etherate, and sodium hydroxide solution is 30 mmol:60 mmol:0.9 g:7 mL, and the mass fraction of the sodium hydroxide solution is 25%.

[0040] The model of PE masterbatch is LDPE 2420H.

[0041] The modified filler is prepared by the following steps:

[0042] Step B1: dispersing graphene oxide in deionized water, stirring at a speed of 200 r / min and a temperature of 30°C, adding ammonium fluorotitanate solution and boric acid solution, heating to 180°C, and reacting for 7 hours to obtain fluorinated graphene; dispersing fluorinated graphene in deionized water, stirring at a speed of 150 r / min and a temperature of 65°C, adding KH570, ethanol and acetic acid, and reacting for 6 hours to obtain modified graphene;

[0043] Step B2: The modified graphene, trichlorosilane, chloroplatinic acid and DMF were mixed uniformly, nitrogen was introduced for protection, and the reaction was carried out at a speed of 150 r / min and a temperature of 75°C for 7 hours to obtain functionalized graphene. Tetramethyltetrasiloxane, 3,4-epoxy-1-butene, chloroplatinic acid and DMF were mixed uniformly, nitrogen was introduced for protection, and the reaction was carried out at a speed of 150 r / min and a temperature of 75°C for 4 hours to obtain a modified monomer;

[0044] Step B3: lithium dimethylvinylsiliconol and tetrahydrofuran were mixed, nitrogen was introduced for protection, and the modified monomer was added under stirring at a speed of 120 r / min and a temperature of 30°C. After reacting for 7 hours, modified graphene was added and the reaction was continued for 3 hours to obtain a precursor. Dodecafluoroheptanol, mercaptosuccinic acid and toluene were mixed uniformly, and p-toluenesulfonic acid was added under stirring at a speed of 150 r / min and a temperature of 105°C to a pH of 1.5. The reaction was carried out for 4 hours to obtain a modifier;

[0045] Step B4: The precursor, modifier, benzophenone and DMF were mixed evenly, and reacted for 25 minutes at a speed of 120 r / min, a temperature of 35° C. and irradiation with 365 nm ultraviolet light to obtain a modified filler.

[0046] The amount ratio of graphene oxide, deionized water, ammonium fluorotitanate solution and boric acid solution in step B1 is 5 mg:3 mL:1 mL:1 mL, the concentration of ammonium fluorotitanate is 50 mg / mL, the concentration of boric acid solution is 10 mg / mL, and the amount ratio of fluorinated graphene, deionized water, KH570, ethanol and acetic acid is 100 mg:50 mL:160 mg:10 mL:1 mL.

[0047] The molar ratio of the double bond on the modified graphene described in step B2 to trichlorosilane is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, the molar ratio of tetramethyltetrasiloxane to 3,4-epoxy-1-butene is 1:4, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyltetrasiloxane.

[0048] The amount ratio of lithium dimethylvinylsiliconol, modified monomer and modified graphene described in step B3 is 2mmol:8mmol:10mg, and the molar ratio of dodecafluoroheptanol and mercaptosuccinic acid is 2:1.

[0049] The molar ratio of the double bond on the precursor and the modifier in step B4 is 1:1, and the amount of benzophenone used is 1% by weight of the modifier.

[0050] Example 3, a method for preparing a corrosion-resistant PE board, specifically comprising the following steps:

[0051] Step A1: 6-maleimidocaproic acid, ethylene glycolamine, dicyclohexylcarbodiimide, and toluene are mixed and reacted at a speed of 150 r / min and a temperature of 25° C. for 5 hours to obtain an intermediate. The intermediate, epichlorohydrin, boron trifluoride etherate, and DMF are uniformly mixed and reacted at a speed of 200 r / min and a temperature of 70° C. for 3 hours. After that, sodium hydroxide solution is added, the temperature is raised to 80° C., and the reaction is continued for 4 hours to obtain a modified additive.

[0052] Step A2: Weigh the following raw materials in parts by weight: 100 parts of PE masterbatch, 10 parts of modified additive, 30 parts of modified filler, 10 parts of 1,3-bis(aminopropyl)tetramethyldisiloxane, 0.8 parts of dicumyl peroxide, and 1 part of 2-ethyl-4-methylimidazole. Add the raw materials into a twin-screw extruder, and melt-extrude the extruded materials under the conditions of a zone 1 temperature of 160°C, a zone 2 temperature of 180°C, a zone 3 temperature of 190°C, and a die head temperature of 200°C. Then, press-mold and cool the extruded materials to produce a corrosion-resistant PE sheet.

[0053] The molar ratio of 6-maleimidocaproic acid, ethylene glycolamine, and dicyclohexylcarbodiimide described in step A1 is 1:1:1.1, the amount ratio of the intermediate, epichlorohydrin, boron trifluoride etherate, and sodium hydroxide solution is 30 mmol:60 mmol:0.9 g:7 mL, and the mass fraction of the sodium hydroxide solution is 25%.

[0054] The model of PE masterbatch is LDPE 2420H.

[0055] The modified filler is prepared by the following steps:

[0056] Step B1: dispersing graphene oxide in deionized water, stirring at a speed of 300 r / min and a temperature of 30°C, adding ammonium fluorotitanate solution and boric acid solution, heating to 185°C, and reacting for 8 hours to obtain fluorinated graphene; dispersing fluorinated graphene in deionized water, stirring at a speed of 200 r / min and a temperature of 70°C, adding KH570, ethanol and acetic acid, and reacting for 7 hours to obtain modified graphene;

[0057] Step B2: The modified graphene, trichlorosilane, chloroplatinic acid and DMF were mixed evenly, nitrogen was introduced for protection, and the reaction was carried out at a speed of 200 r / min and a temperature of 80°C for 8 hours to obtain functionalized graphene. Tetramethyltetrasiloxane, 3,4-epoxy-1-butene, chloroplatinic acid and DMF were mixed evenly, nitrogen was introduced for protection, and the reaction was carried out at a speed of 200 r / min and a temperature of 80°C for 5 hours to obtain a modified monomer;

[0058] Step B3: lithium dimethylvinylsiliconol and tetrahydrofuran were mixed, nitrogen was introduced, and the modified monomer was added under stirring at a speed of 150 r / min and a temperature of 30°C. After reacting for 8 hours, modified graphene was added and the reaction was continued for 3 hours to obtain a precursor. Dodecafluoroheptanol, mercaptosuccinic acid and toluene were mixed uniformly, and p-toluenesulfonic acid was added under stirring at a speed of 200 r / min and a temperature of 110°C until the pH value was 1.5. The reaction was carried out for 5 hours to obtain a modifier;

[0059] Step B4: The precursor, modifier, benzophenone and DMF were mixed evenly, and reacted for 30 minutes at a speed of 150 r / min, a temperature of 40° C. and irradiation with 365 nm ultraviolet light to obtain a modified filler.

[0060] The amount ratio of graphene oxide, deionized water, ammonium fluorotitanate solution and boric acid solution in step B1 is 5 mg:3 mL:1 mL:1 mL, the concentration of ammonium fluorotitanate is 50 mg / mL, the concentration of boric acid solution is 10 mg / mL, and the amount ratio of fluorinated graphene, deionized water, KH570, ethanol and acetic acid is 100 mg:50 mL:160 mg:10 mL:1 mL.

[0061] The molar ratio of the double bond on the modified graphene described in step B2 to trichlorosilane is 1:1, the amount of chloroplatinic acid is 1‰ of the mass of trichlorosilane, the molar ratio of tetramethyltetrasiloxane to 3,4-epoxy-1-butene is 1:4, and the amount of chloroplatinic acid is 1‰ of the mass of tetramethyltetrasiloxane.

[0062] The amount ratio of lithium dimethylvinylsiliconol, modified monomer and modified graphene described in step B3 is 2mmol:8mmol:10mg, and the molar ratio of dodecafluoroheptanol and mercaptosuccinic acid is 2:1.

[0063] The molar ratio of the double bond on the precursor and the modifier in step B4 is 1:1, and the amount of benzophenone used is 1% by weight of the modifier.

[0064] Comparative Example 1: Compared with the example, ethylenediamine was used instead of 1,3-bis(aminopropyl)tetramethyldisiloxane, and the remaining steps were the same.

[0065] Comparative Example 2: Compared with Example 1, no modifying additive was added in this comparative example, and the remaining steps were the same.

[0066] Comparative Example 3: Compared with Example 1, this comparative example uses graphene oxide instead of graphene fluoride, and the other steps are the same.

[0067] Comparative Example 4: Compared with Example 1, this comparative example uses a precursor instead of a modified filler, and the remaining steps are the same.

[0068] The PE boards prepared in Examples 1-3 and Comparative Examples 1-4 were immersed in a 98% by mass sulfuric acid solution and a 40% by mass sodium hydroxide solution for 16 weeks, respectively, in accordance with the standard GB / T11547-2008. The tensile properties of the samples before and after corrosion were compared, and the tensile strength retention rate was calculated. The test results are shown in Table 1 below.

[0069] Table 1

[0070] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Sulfuric acid solution treatment retention rate % 85.21 86.88 88.36 81.15 68.71 79.15 61.37 Sodium hydroxide solution treatment retention rate % 94.47 95.32 95.61 88.84 79.14 82.17 73.98

[0071] It can be seen from Table 1 that the present invention has a very good corrosion resistance effect.

[0072] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a corrosion-resistant PE board, characterized by: The specific steps include: Step A1: 6-maleimidocaproic acid, ethylene glycolamine, dicyclohexylcarbodiimide, and toluene are mixed and reacted to obtain an intermediate. The intermediate, epichlorohydrin, boron trifluoride etherate, and DMF are mixed and reacted, and then sodium hydroxide solution is added. The temperature is increased and the reaction is continued to obtain a modified additive. Step A2: Weigh the following raw materials in parts by weight: 80-100 parts of PE masterbatch, 8-10 parts of modified additive, 20-30 parts of modified filler, 8-10 parts of 1,3-bis(aminopropyl)tetramethyldisiloxane, 0.5-0.8 parts of dicumyl peroxide, and 0.5-1 parts of 2-ethyl-4-methylimidazole, add the raw materials into a twin-screw extruder, melt-extrude, and then compression mold and cool to produce a corrosion-resistant PE sheet; The modified filler is prepared by the following steps: Step B1: dispersing graphene oxide in deionized water, stirring, adding ammonium fluorotitanate solution and boric acid solution, and heating to react to obtain fluorinated graphene; dispersing fluorinated graphene in deionized water, stirring, adding KH570, ethanol, and acetic acid, and reacting to obtain modified graphene; Step B2: uniformly mixing the modified graphene, trichlorosilane, chloroplatinic acid, and DMF, introducing nitrogen protection, and reacting to obtain functionalized graphene; uniformly mixing tetramethyltetrasiloxane, 3,4-epoxy-1-butene, chloroplatinic acid, and DMF, introducing nitrogen protection, and reacting to obtain a modified monomer; Step B3: lithium dimethylvinylsilanol and tetrahydrofuran are mixed, nitrogen is introduced, and the mixture is stirred and a modified monomer is added. After the reaction, modified graphene is added and the reaction is continued to obtain a precursor. dodecafluoroheptanol, mercaptosuccinic acid, and toluene are mixed and stirred, and p-toluenesulfonic acid is added and reacted to obtain a modifier. Step B4: mixing the precursor, the modifier, benzophenone and DMF and irradiating them with ultraviolet light to react, thereby obtaining a modified filler.

2. The method for preparing a corrosion-resistant PE board according to claim 1, characterized in that: The molar ratio of 6-maleimidocaproic acid, ethylene glycolamine, and dicyclohexylcarbodiimide described in step A1 is 1:1:1.1, and the amount ratio of the intermediate, epichlorohydrin, boron trifluoride etherate, and sodium hydroxide solution is 30 mmol:60 mmol:0.9 g:7 mL.

3. The method for preparing a corrosion-resistant PE board according to claim 1, characterized in that: The amount ratio of graphene oxide, deionized water, ammonium fluorotitanate solution and boric acid solution in step B1 is 5 mg:3 mL:1 mL:1 mL, and the amount ratio of fluorinated graphene, deionized water, KH570, ethanol and acetic acid is 100 mg:50 mL:160 mg:10 mL:1 mL.

4. The method for preparing a corrosion-resistant PE board according to claim 1, wherein: The molar ratio of the double bonds on the modified graphene described in step B2 to trichlorosilane is 1:1, and the molar ratio of tetramethyltetrasiloxane to 3,4-epoxy-1-butene is 1:

4.

5. The method for preparing a corrosion-resistant PE board according to claim 1, characterized in that: The amount ratio of lithium dimethylvinylsiliconol, modified monomer and modified graphene described in step B3 is 2mmol:8mmol:10mg, and the molar ratio of dodecafluoroheptanol and mercaptosuccinic acid is 2:

1.

6. The method for preparing a corrosion-resistant PE board according to claim 1, characterized in that: The molar ratio of the double bond on the precursor and the modifier described in step B4 is 1:

1.

7. A corrosion-resistant PE board, characterized by: Prepared according to any one of claims 1 to 6.