A mine-used light polymer conveyor scraper and a preparation method thereof

Abstract

The application discloses a mine-used light polymer conveyor scraper and a preparation method thereof, relates to the technical field of polyamide scrapers, and selects polyamide 6 as a base material, has good flexibility and impact resistance, can effectively buffer the impact force of materials, and reduces accidents; meanwhile, metal scraps are not generated, and potential safety hazards caused by the scraps are avoided. The application also introduces H / T alloy nets as an intermediate reinforcing layer, significantly improves the strength and impact resistance of the scraper, and meanwhile, the light property of the scraper is maintained. The application adds nanoscale silicon dioxide in the modified polyamide 6 base body, improves the wear resistance and acid and alkali resistance of the scraper. The application adds glass fibers, the thermal expansion coefficient of which is relatively close to that of the alloy. The problem of deformation and cracking caused by the mismatch of the thermal expansion coefficients is avoided, and the thermal stability of the scraper is improved.

Description

Technical Field

[0001] This invention relates to the field of polyamide scraper technology, specifically a scraper for a lightweight polymer conveyor in mining and its preparation method. Background Technology

[0002] In the field of mining transportation, scrapers are key components of conveyors, and their performance directly affects transportation efficiency and safety. Traditional metal scrapers suffer from problems such as heavy weight, easy wear, poor corrosion resistance, and susceptibility to sparks, making them unable to meet the requirements of modern mines for high efficiency, safety, and environmental protection. In recent years, polymer materials have received widespread attention in the field of mining scrapers due to their lightweight, wear-resistant, and corrosion-resistant properties.

[0003] However, existing polymer scrapers still have some shortcomings: First, their strength and wear resistance need to be improved, especially in high-load and high-impact mining environments, where they are prone to wear and breakage; second, the interfacial bonding performance between polymer materials and reinforcing materials is poor, leading to unstable overall performance; and third, the thermal expansion coefficients are mismatched, making them prone to deformation and cracking in environments with large temperature changes.

[0004] In summary, in order to solve the above problems and improve strength and wear resistance, this application provides a lightweight polymer conveyor scraper for mining and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to provide a scraper for a lightweight polymer conveyor in mining and its preparation method, so as to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for preparing a scraper for a lightweight polymer conveyor in mining includes the following steps:

[0008] Step 1: Mix polyamide 6, glass fiber, and nano silica evenly, and then melt-blend them using a twin-screw extruder to produce composite material particles;

[0009] Step 2: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0010] The polyamide 6 is an amino-terminated antistatic polyamide 6, which is prepared by: taking caprolactam, sodium hypophosphite, deionized water, and diethylenetriaminepentaacetic acid, purging with nitrogen, heating to 200-210℃, reacting for 1-2 hours, adding 3-aminopropyltriethoxysilane, heating to 220℃, reacting for 60-70 minutes, adding 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, mixing evenly, and obtaining amino-terminated antistatic polyamide 6.

[0011] In a more optimized manner, the preparation method of the alloy mesh B is as follows: take an alloy plate, laser-drill holes to obtain an alloy mesh, clean and dry it to obtain a pretreated alloy mesh; perform micro-arc oxidation treatment on the pretreated alloy mesh to obtain alloy mesh A; coat the modified liquid onto alloy mesh A and dry it to obtain alloy mesh B.

[0012] Ideally, in step one, the alloy mesh can be either an H-type alloy mesh or a T-type alloy mesh.

[0013] More preferably, the composite material particles include the following components, by weight: 65-70 parts of amino-terminated antistatic polyamide 6, 25-27 parts of aminated glass fiber, and 3-4 parts of nano-silica.

[0014] Ideally, the current density of the micro-arc oxidation treatment is 3 A / dm³. 2 The temperature is 30-32℃ and the time is 30-40 minutes.

[0015] In a more optimized manner, the micro-arc oxidation solution used in the micro-arc oxidation process comprises the following components: 10-12 g / L sodium aluminate, 7-10 g / L sodium silicate, 8-10 g / L potassium fluoride, 0.5-1 g / L ethylenediaminetetraacetic acid, 6-8 g / L sodium hydroxide, 2-3 g / L glycerol, and the remainder being deionized water.

[0016] A more optimized method for preparing the modified solution is as follows: take deionized water and acetic acid, stir evenly to obtain an acetic acid solution; take 3-isocyanate-propyltriethoxysilane, add it to anhydrous ethanol, stir for 10-20 min, add the acetic acid solution, and react for 4-5 h to obtain the modified solution.

[0017] More preferably, the glass fiber is an aminated glass fiber, and its preparation method is as follows: take glass fiber and treat it with plasma for 40-50s to obtain pretreated glass fiber; take a mixed solution of γ-aminopropyltriethoxysilane, ethanol and deionized water, stir it evenly to obtain a treatment solution; immerse the pretreated glass fiber in the treatment solution for 1-2h, and dry it to obtain aminated glass fiber.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This application uses polyamide 6 as the base material, which has good flexibility and impact resistance, effectively buffering the impact force of materials and reducing accidents; at the same time, it does not produce metal shavings, avoiding safety hazards caused by shavings. This application also significantly improves the strength and impact resistance of the scraper by introducing H / T type alloy mesh as an intermediate reinforcing layer, while maintaining the lightweight characteristics of the scraper. This application adds nano-sized silica to the modified polyamide 6 matrix to improve the wear resistance and acid and alkali resistance of the scraper.

[0020] 2. The coefficients of thermal expansion of polyamide 6 and alloy mesh are not entirely the same, but this application adds glass fiber, which reduces the coefficient of thermal expansion of the polyamide 6 substrate to 2×10⁻⁶. -5 K -1 ~3×10 -5 K -1 It is similar to alloy mesh, avoiding problems such as deformation and cracking caused by mismatch in thermal expansion coefficients, and improving the thermal stability of the scraper.

[0021] 3. This application involves micro-arc oxidation treatment of the alloy mesh, followed by coating with a 3-isocyanate-propyltriethoxysilane modified solution. Micro-arc oxidation promotes the bonding between the alloy mesh and the silane modified solution. At this time, the isocyanate groups on the surface of the alloy mesh can react with a large number of amino groups in the amino-terminated antistatic polyamide 6, thereby increasing the tensile strength of the scraper.

[0022] 4. In the preparation of polyamide 6, this application adds 3-aminopropyltriethoxysilane and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, which increases the number of amino groups in polyamide 6 and enhances its antistatic properties. This application also performs amination treatment on the glass fiber, improving the dispersibility of the glass fiber in the polyamide 6 substrate, thereby improving the mechanical properties of the scraper. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The sources and types of the substances involved in this invention are not particularly limited. Exemplary examples include: polyamide 6: part number: 1022B, Ube Industries, Ltd., Japan, Mn=16000; glass fiber: part number WJ103, which can be purchased from Wuhe Weijia Composite Materials Co., Ltd.; nano silica: model: HL-200, which can be purchased from Hubei Huifu Nanomaterials Co., Ltd.; alloy plate: 20Cr steel.

[0025] Example 1: A method for preparing a scraper for a lightweight polymer conveyor in mining, comprising the following steps:

[0026] Step 1: Take an alloy sheet, laser-drill holes to obtain an H-shaped alloy mesh, clean and dry it to obtain a pre-treated alloy mesh with a thickness of 0.8mm;

[0027] The pretreated alloy mesh was placed in a micro-arc oxidation solution for micro-arc oxidation treatment at a current density of 3 A / dm². 2 The temperature was 31℃ and the time was 35 min. The mesh was removed, washed, and dried to obtain alloy mesh A. The modified liquid was coated on alloy mesh A with a coating thickness of 2µm and dried to obtain alloy mesh B.

[0028] Step 2: Mix amino-terminated antistatic polyamide 6, aminated glass fiber, and nano-silica evenly, and then melt-blend them through a twin-screw extruder to produce composite material particles;

[0029] The composite material particles comprise the following components, by weight: 67 parts amino-terminated antistatic polyamide 6, 26 parts amino-modified glass fiber, and 3.5 parts nano-silica.

[0030] Step 3: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0031] S1: Preparation of micro-arc oxidation solution:

[0032] Take sodium aluminate, sodium silicate, potassium fluoride, ethylenediaminetetraacetic acid, sodium hydroxide, and glycerol, mix them evenly, add deionized water, and prepare a micro-arc oxidation solution;

[0033] The micro-arc oxidation solution contains the following components: 11 g / L sodium aluminate, 8 g / L sodium silicate, 9 g / L potassium fluoride, 0.7 g / L ethylenediaminetetraacetic acid, 7 g / L sodium hydroxide, 2.5 g / L glycerol, and the remainder is deionized water.

[0034] S2: Preparation of the modified liquid:

[0035] Take 8 mL of deionized water and 2 mL of acetic acid, stir well to obtain an acetic acid solution; take 8 g of 3-isocyanate-propyltriethoxysilane, add it to 90 mL of anhydrous ethanol, stir for 15 min, add the acetic acid solution, and react for 4.5 h to obtain the modified solution;

[0036] S3: Preparation of amino-terminated antistatic polyamide 6:

[0037] Take 40g caprolactam, 0.06g sodium hypophosphite, 2mL deionized water, and 0.4g diethylenetriaminepentaacetic acid, purge with nitrogen, heat to 205℃, react for 1.5h, add 0.1g 3-aminopropyltriethoxysilane, heat to 220℃, react for 65min, add 0.2g 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, mix well, and obtain amino-terminated antistatic polyamide 6;

[0038] S4: Preparation of aminated glass fibers:

[0039] Glass fibers were subjected to plasma treatment for 45 seconds to obtain pretreated glass fibers. 2g of γ-aminopropyltriethoxysilane and 100mL of a 1:1 volume ratio ethanol-deionized water mixture were stirred evenly to obtain a treatment solution. The pretreated glass fibers were immersed in the treatment solution for 1.5h and dried to obtain aminated glass fibers.

[0040] Example 2: A method for preparing a scraper for a lightweight polymer conveyor in mining, comprising the following steps:

[0041] Step 1: Take an alloy sheet, laser-drill holes to obtain an H-shaped alloy mesh, clean and dry it to obtain a pre-treated alloy mesh with a thickness of 0.8mm;

[0042] The pretreated alloy mesh was placed in a micro-arc oxidation solution for micro-arc oxidation treatment at a current density of 3 A / dm². 2 The temperature was 30℃ and the time was 30 min. The mesh was removed, washed, and dried to obtain alloy mesh A. The modified liquid was coated on alloy mesh A with a coating thickness of 2µm and dried to obtain alloy mesh B.

[0043] Step 2: Mix amino-terminated antistatic polyamide 6, aminated glass fiber, and nano-silica evenly, and then melt-blend them through a twin-screw extruder to produce composite material particles;

[0044] The composite material particles include the following components, by weight: 65 parts amino-terminated antistatic polyamide 6, 25 parts amino-modified glass fiber, and 3 parts nano-silica.

[0045] Step 3: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0046] S1: Preparation of micro-arc oxidation solution:

[0047] Take sodium aluminate, sodium silicate, potassium fluoride, ethylenediaminetetraacetic acid, sodium hydroxide, and glycerol, mix them evenly, add deionized water, and prepare a micro-arc oxidation solution;

[0048] The micro-arc oxidation solution contains the following components: 10 g / L sodium aluminate, 7 g / L sodium silicate, 8 g / L potassium fluoride, 0.5 g / L ethylenediaminetetraacetic acid, 6 g / L sodium hydroxide, 2 g / L glycerol, and the remainder is deionized water.

[0049] S2: Preparation of the modified liquid:

[0050] Take 8 mL of deionized water and 2 mL of acetic acid, stir well to obtain an acetic acid solution; take 8 g of 3-isocyanate-propyltriethoxysilane, add it to 90 mL of anhydrous ethanol, stir for 10 min, add the acetic acid solution, and react for 4 h to obtain the modified solution;

[0051] S3: Preparation of amino-terminated antistatic polyamide 6:

[0052] Take 40g caprolactam, 0.06g sodium hypophosphite, 2mL deionized water, and 0.4g diethylenetriaminepentaacetic acid, purge with nitrogen, heat to 200℃, react for 1h, add 0.1g 3-aminopropyltriethoxysilane, heat to 220℃, react for 60min, add 0.2g 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, mix well, and obtain amino-terminated antistatic polyamide 6;

[0053] S4: Preparation of aminated glass fibers:

[0054] Glass fibers were subjected to plasma treatment for 40 seconds to obtain pretreated glass fibers. 2g of γ-aminopropyltriethoxysilane and 100mL of a 1:1 volume ratio ethanol-deionized water mixture were stirred evenly to obtain a treatment solution. The pretreated glass fibers were immersed in the treatment solution for 1 hour and then dried to obtain aminated glass fibers.

[0055] Example 3: A method for preparing a scraper for a lightweight polymer conveyor in mining, comprising the following steps:

[0056] Step 1: Take an alloy sheet, laser-drill holes to obtain an H-shaped alloy mesh, clean and dry it to obtain a pre-treated alloy mesh with a thickness of 0.8mm;

[0057] The pretreated alloy mesh was placed in a micro-arc oxidation solution for micro-arc oxidation treatment at a current density of 3 A / dm². 2 The temperature was 32℃ and the time was 40 min. The mesh was removed, washed, and dried to obtain alloy mesh A. The modified liquid was coated on alloy mesh A with a coating thickness of 2µm and dried to obtain alloy mesh B.

[0058] Step 2: Mix amino-terminated antistatic polyamide 6, aminated glass fiber, and nano-silica evenly, and then melt-blend them through a twin-screw extruder to produce composite material particles;

[0059] The composite material particles comprise the following components, by weight: 70 parts amino-terminated antistatic polyamide 6, 27 parts amino-modified glass fiber, and 4 parts nano-silica.

[0060] Step 3: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0061] S1: Preparation of micro-arc oxidation solution:

[0062] Take sodium aluminate, sodium silicate, potassium fluoride, ethylenediaminetetraacetic acid, sodium hydroxide, and glycerol, mix them evenly, add deionized water, and prepare a micro-arc oxidation solution;

[0063] The micro-arc oxidation solution contains the following components: 12 g / L sodium aluminate, 10 g / L sodium silicate, 10 g / L potassium fluoride, 1 g / L ethylenediaminetetraacetic acid, 8 g / L sodium hydroxide, 3 g / L glycerol, and the remainder is deionized water.

[0064] S2: Preparation of the modified liquid:

[0065] Take 8 mL of deionized water and 2 mL of acetic acid, stir well to obtain an acetic acid solution; take 8 g of 3-isocyanate-propyltriethoxysilane, add it to 90 mL of anhydrous ethanol, stir for 20 min, add the acetic acid solution, and react for 5 h to obtain the modified solution;

[0066] S3: Preparation of amino-terminated antistatic polyamide 6:

[0067] Take 40g caprolactam, 0.06g sodium hypophosphite, 2mL deionized water, and 0.4g diethylenetriaminepentaacetic acid, purge with nitrogen, heat to 210℃, react for 2h, add 0.1g 3-aminopropyltriethoxysilane, heat to 220℃, react for 70min, add 0.2g 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, mix well, and obtain amino-terminated antistatic polyamide 6;

[0068] S4: Preparation of aminated glass fibers:

[0069] Glass fibers were subjected to plasma treatment for 50 seconds to obtain pretreated glass fibers. 2g of γ-aminopropyltriethoxysilane and 100mL of a 1:1 volume ratio ethanol-deionized water mixture were stirred evenly to obtain a treatment solution. The pretreated glass fibers were immersed in the treatment solution for 2 hours and then dried to obtain aminated glass fibers.

[0070] Comparative Example 1: Polyamide 6 was not modified with 3-aminopropyltriethoxysilane; all other modifications were the same as in Example 1.

[0071] Step 1: Take an alloy sheet, laser-drill holes to obtain an H-shaped alloy mesh, clean and dry it to obtain a pre-treated alloy mesh with a thickness of 0.8mm;

[0072] The pretreated alloy mesh was placed in a micro-arc oxidation solution for micro-arc oxidation treatment at a current density of 3 A / dm². 2 The temperature was 31℃ and the time was 35 min. The mesh was removed, washed, and dried to obtain alloy mesh A. The modified liquid was coated on alloy mesh A with a coating thickness of 2µm and dried to obtain alloy mesh B.

[0073] Step 2: Mix antistatic polyamide 6, aminated glass fiber, and nano silica evenly, and melt blend them through a twin-screw extruder to produce composite material particles;

[0074] The composite material particles comprise the following components, by weight: 67 parts antistatic polyamide 6, 26 parts aminated glass fiber, and 3.5 parts nano silica;

[0075] Step 3: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0076] S1: Preparation of micro-arc oxidation solution:

[0077] Take sodium aluminate, sodium silicate, potassium fluoride, ethylenediaminetetraacetic acid, sodium hydroxide, and glycerol, mix them evenly, add deionized water, and prepare a micro-arc oxidation solution;

[0078] The micro-arc oxidation solution contains the following components: 11 g / L sodium aluminate, 8 g / L sodium silicate, 9 g / L potassium fluoride, 0.7 g / L ethylenediaminetetraacetic acid, 7 g / L sodium hydroxide, 2.5 g / L glycerol, and the remainder is deionized water.

[0079] S2: Preparation of the modified liquid:

[0080] Take 8 mL of deionized water and 2 mL of acetic acid, stir well to obtain an acetic acid solution; take 8 g of 3-isocyanate-propyltriethoxysilane, add it to 90 mL of anhydrous ethanol, stir for 15 min, add the acetic acid solution, and react for 4.5 h to obtain the modified solution;

[0081] S3: Preparation of antistatic polyamide 6:

[0082] Take 40g caprolactam, 0.06g sodium hypophosphite, 2mL deionized water, and 0.4g diethylenetriaminepentaacetic acid, purge with nitrogen, heat to 205℃, react for 1.5h, add 0.2g 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, heat to 220℃, mix evenly to obtain antistatic polyamide 6;

[0083] S4: Preparation of aminated glass fibers:

[0084] Glass fibers were subjected to plasma treatment for 45 seconds to obtain pretreated glass fibers. 2g of γ-aminopropyltriethoxysilane and 100mL of a 1:1 volume ratio ethanol-deionized water mixture were stirred evenly to obtain a treatment solution. The pretreated glass fibers were immersed in the treatment solution for 1.5h and dried to obtain aminated glass fibers.

[0085] Comparative Example 2: No glass fiber added, otherwise the same as Example 1:

[0086] Step 1: Take an alloy sheet, laser-drill holes to obtain an H-shaped alloy mesh, clean and dry it to obtain a pre-treated alloy mesh with a thickness of 0.8mm;

[0087] The pretreated alloy mesh was placed in a micro-arc oxidation solution for micro-arc oxidation treatment at a current density of 3 A / dm². 2 The temperature was 31℃ and the time was 35 min. The mesh was removed, washed, and dried to obtain alloy mesh A. The modified liquid was coated on alloy mesh A with a coating thickness of 2µm and dried to obtain alloy mesh B.

[0088] Step 2: Mix amino-terminated antistatic polyamide 6 and nano silica evenly, and then melt-blend them through a twin-screw extruder to produce composite material particles;

[0089] The composite material particles comprise the following components, by weight: 67 parts amino-terminated antistatic polyamide and 26 parts nano-silica;

[0090] Step 3: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0091] S1: Preparation of micro-arc oxidation solution:

[0092] Take sodium aluminate, sodium silicate, potassium fluoride, ethylenediaminetetraacetic acid, sodium hydroxide, and glycerol, mix them evenly, add deionized water, and prepare a micro-arc oxidation solution;

[0093] The micro-arc oxidation solution contains the following components: 11 g / L sodium aluminate, 8 g / L sodium silicate, 9 g / L potassium fluoride, 0.7 g / L ethylenediaminetetraacetic acid, 7 g / L sodium hydroxide, 2.5 g / L glycerol, and the remainder is deionized water.

[0094] S2: Preparation of the modified liquid:

[0095] Take 8 mL of deionized water and 2 mL of acetic acid, stir well to obtain an acetic acid solution; take 8 g of 3-isocyanate-propyltriethoxysilane, add it to 90 mL of anhydrous ethanol, stir for 15 min, add the acetic acid solution, and react for 4.5 h to obtain the modified solution;

[0096] S3: Preparation of amino-terminated antistatic polyamide 6:

[0097] Take 40g caprolactam, 0.06g sodium hypophosphite, 2mL deionized water, and 0.4g diethylenetriaminepentaacetic acid. Purge with nitrogen and heat to 205℃. React for 1.5h. Add 0.1g 3-aminopropyltriethoxysilane and heat to 220℃. React for 65min. Add 0.2g 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and mix well to obtain amino-terminated antistatic polyamide 6.

[0098] Comparative Example 3: No modification liquid was applied to the alloy mesh; all other aspects were the same as in Example 1.

[0099] Step 1: Take an alloy sheet, laser-drill holes to obtain an H-shaped alloy mesh, clean and dry it to obtain a pre-treated alloy mesh with a thickness of 0.8mm;

[0100] The pretreated alloy mesh was placed in a micro-arc oxidation solution for micro-arc oxidation treatment at a current density of 3 A / dm². 2 The temperature was 31℃ and the time was 35 minutes. The material was then removed, washed, and dried to obtain alloy mesh A.

[0101] Step 2: Mix amino-terminated antistatic polyamide 6, aminated glass fiber, and nano-silica evenly, and then melt-blend them through a twin-screw extruder to produce composite material particles;

[0102] The composite material particles comprise the following components, by weight: 67 parts amino-terminated antistatic polyamide 6, 26 parts amino-modified glass fiber, and 3.5 parts nano-silica.

[0103] Step 3: Place alloy mesh A in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining.

[0104] S1: Preparation of micro-arc oxidation solution:

[0105] Take sodium aluminate, sodium silicate, potassium fluoride, ethylenediaminetetraacetic acid, sodium hydroxide, and glycerol, mix them evenly, add deionized water, and prepare a micro-arc oxidation solution;

[0106] The micro-arc oxidation solution contains the following components: 11 g / L sodium aluminate, 8 g / L sodium silicate, 9 g / L potassium fluoride, 0.7 g / L ethylenediaminetetraacetic acid, 7 g / L sodium hydroxide, 2.5 g / L glycerol, and the remainder is deionized water.

[0107] S2: Preparation of amino-terminated antistatic polyamide 6:

[0108] Take 40g caprolactam, 0.06g sodium hypophosphite, 2mL deionized water, and 0.4g diethylenetriaminepentaacetic acid, purge with nitrogen, heat to 205℃, react for 1.5h, add 0.1g 3-aminopropyltriethoxysilane, heat to 220℃, react for 65min, add 0.2g 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, mix well, and obtain amino-terminated antistatic polyamide 6;

[0109] S4: Preparation of aminated glass fibers:

[0110] Glass fibers were subjected to plasma treatment for 45 seconds to obtain pretreated glass fibers. 2g of γ-aminopropyltriethoxysilane and 100mL of a 1:1 volume ratio ethanol-deionized water mixture were stirred evenly to obtain a treatment solution. The pretreated glass fibers were immersed in the treatment solution for 1.5h and dried to obtain aminated glass fibers.

[0111] experiment:

[0112] The scrapers prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests. The scrapers were cut into 80mm × 20mm × 5mm samples and heat-treated at 125℃ for 8 hours. Delamination and blistering between the scraper alloy mesh and the polyamide substrate were observed to characterize their thermal stability. The scrapers were also cut into 80mm × 10mm × 5mm samples, and the tensile strength of the scrapers was tested according to GB / T 1040.2-2022. The data obtained are shown in Table 1 below.

[0113] Table 1

[0114]

[0115] Conclusion: The data comparison in the table shows that in Comparative Example 1, without modification of polyamide 6 with 3-aminopropyltriethoxysilane, the tensile strength of the scraper decreased. In Comparative Example 2, without adding glass fiber, the thermal expansion coefficients of polyamide 6 and the alloy mesh were not completely consistent, resulting in poor thermal stability and delamination and cracking between the alloy mesh and the polyamide substrate. In Comparative Example 3, without coating the alloy mesh with the modification liquid, the tensile strength of the scraper decreased. In Examples 1-3 of this application, the alloy mesh was coated with a 3-isocyanate-propyltriethoxysilane modification liquid. In this case, the isocyanate groups on the surface of the alloy mesh could react with a large number of amino groups in the amino-terminated antistatic polyamide 6, improving the tensile strength of the scraper. Adding 3-aminopropyltriethoxysilane during the preparation of polyamide 6 improved the dispersibility of glass fiber in the polyamide 6 substrate, thereby improving the mechanical properties of the scraper. Examples 1-3 also added glass fiber. The addition of glass fiber reduces the coefficient of thermal expansion of the polyamide 6 substrate, making it closer to that of the 20Cr steel alloy plate of the present invention. This avoids problems such as deformation and cracking caused by mismatch in coefficient of thermal expansion and improves the thermal stability of the scraper.

[0116] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A method for preparing a scraper for a lightweight polymer conveyor in mining, characterized in that: Includes the following steps: Step 1: Mix polyamide 6, glass fiber, and nano silica evenly, and then melt-blend them using a twin-screw extruder to produce composite material particles; Step 2: Place alloy mesh B in the mold, and mold the composite material particles with the alloy mesh through injection molding. Polish to obtain the scraper of the lightweight polymer conveyor for mining. The polyamide 6 is an amino-terminated antistatic polyamide 6, which is prepared by: taking caprolactam, sodium hypophosphite, deionized water, and diethylenetriaminepentaacetic acid, purging with nitrogen, heating to 200-210℃, reacting for 1-2 hours, adding 3-aminopropyltriethoxysilane, heating to 220℃, reacting for 60-70 minutes, adding 1-butyl-3-methylimidazolium diimide salt, mixing evenly, and obtaining amino-terminated antistatic polyamide 6; The alloy mesh B is prepared by taking an alloy plate, drilling holes with a laser to obtain an alloy mesh, cleaning and drying it to obtain a pretreated alloy mesh. The pretreated alloy mesh was subjected to micro-arc oxidation treatment to obtain alloy mesh A; the modified liquid was coated on alloy mesh A and dried to obtain alloy mesh B; The modified solution is prepared as follows: take deionized water and acetic acid, stir evenly to obtain an acetic acid solution; take 3-isocyanate-propyltriethoxysilane, add it to anhydrous ethanol, stir for 10-20 min, add the acetic acid solution, and react for 4-5 h to obtain the modified solution.

2. The method for preparing a scraper for a lightweight polymer conveyor in mining according to claim 1, characterized in that: In step one, the alloy mesh can be either an H-type alloy mesh or a T-type alloy mesh.

3. The method for preparing a scraper for a lightweight polymer conveyor in mining according to claim 1, characterized in that: The composite material particles include the following components, by weight: 65-70 parts of amino-terminated antistatic polyamide 6, 25-27 parts of aminated glass fiber, and 3-4 parts of nano-silica.

4. The method for preparing a scraper for a lightweight polymer conveyor in mining according to claim 1, characterized in that: The current density of the micro-arc oxidation treatment is 3A / dm. 2 The temperature is 30-32℃ and the time is 30-40 minutes.

5. The method for preparing a scraper for a lightweight polymer conveyor in mining according to claim 4, characterized in that: The micro-arc oxidation solution used in the micro-arc oxidation process includes the following components: Sodium aluminate 10-12 g / L, sodium silicate 7-10 g / L, potassium fluoride 8-10 g / L, ethylenediaminetetraacetic acid 0.5-1 g / L, sodium hydroxide 6-8 g / L, glycerol 2-3 g / L, and the remainder is deionized water.

6. The method for preparing a scraper for a lightweight polymer conveyor in mining according to claim 1, characterized in that: The glass fiber is an aminated glass fiber, and its preparation method is as follows: take glass fiber and treat it with plasma for 40-50s to obtain pretreated glass fiber; take a mixed solution of γ-aminopropyltriethoxysilane, ethanol and deionized water, stir it evenly to obtain a treatment solution; immerse the pretreated glass fiber in the treatment solution for 1-2h, and dry it to obtain aminated glass fiber.

7. The scraper prepared by the method for preparing a lightweight polymer conveyor scraper for mining according to any one of claims 1-6.

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