An abrasion-resistant and corrosion-proof polyethylene composite material for idlers and its preparation method

Abstract

The present invention relates to the technical field of polymer materials, and particularly relates to a wear-resistant and anti-corrosion polyethylene composite material for idlers and a preparation method thereof; the polyethylene composite material is composed of the following raw materials in parts by weight: 50-80 parts of compounded polyethylene, 20-30 parts of glass fiber, 2-3 parts of molybdenum disulfide, 4-8 parts of ammonium polyphosphate, 2-5 parts of polyethylene wax, 5-8 parts of nano-titanium dioxide, 0.8-1.5 parts of graphene, 5-8 parts of toughening agent, 0.8-1.5 parts of antioxidant, 0.5-1 part of ultraviolet absorber, 0.3-0.8 part of silane coupling agent and 3-5 parts of wear-resistant and anti-corrosion auxiliary agent; the compounded polyethylene is compounded from high-density polyethylene with a melt index of 18 g / 10 min and high-density polyethylene with a melt index of 0.8 g / 10 min according to a mass ratio of 2-3:1; the polyethylene composite material prepared by the present invention not only has excellent wear resistance and mechanical properties, but also has excellent anti-corrosion properties, which extends its service life to a certain extent while ensuring its quality.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a wear-resistant and anti-corrosive polyethylene composite material for idlers and a preparation method thereof. Background Art

[0002] As a key component of a belt conveyor, an idler plays an important role in supporting the weight of the conveyor belt and materials and reducing the running resistance of the conveyor belt in many industries such as coal, mines, ports, and power. There are two types of idlers: steel and plastic. Plastic idlers are widely used in the field of conveyor systems due to their strong anti-adhesion ability and light weight. Although plastic idlers have excellent mechanical properties, their wear resistance and anti-corrosion properties are relatively insufficient and still need to be further improved. For example, in actual use, plastic idlers often face harsh working conditions, and the friction and wear caused by long-term contact with materials will cause serious damage to them. Moreover, when plastic idlers operate in a humid environment for a long time, their surfaces may be parasitized by microorganisms in the air, and they will be corroded under the erosion of microorganisms, which will not only shorten the service life of plastic idlers but also may affect the overall running stability and conveying efficiency of the belt conveyor. Therefore, the present invention provides a wear-resistant and anti-corrosive polyethylene composite material for idlers and a preparation method thereof to solve the above-mentioned technical problems! Summary of the Invention

[0003] The purpose of the present invention is to provide a wear-resistant and anti-corrosive polyethylene composite material for idlers and a preparation method thereof. The prepared polyethylene composite material not only has excellent wear resistance and mechanical properties but also has excellent anti-corrosion properties, which extends its service life to a certain extent while ensuring its quality.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A wear-resistant and anti-corrosive polyethylene composite material for idlers, the polyethylene composite material is composed of the following raw materials in parts by weight: 50-80 parts of compound polyethylene, 20-30 parts of glass fiber, 2-3 parts of molybdenum disulfide, 4-8 parts of ammonium polyphosphate, 2-5 parts of polyethylene wax, 5-8 parts of nano-titanium dioxide, 0.8-1.5 parts of graphene, 5-8 parts of toughening agent, 0.8-1.5 parts of antioxidant, 0.5-1 part of ultraviolet absorber, 0.3-0.8 part of silane coupling agent, and 3-5 parts of wear-resistant and anti-corrosive auxiliary agent.

[0006] The compound polyethylene is compounded from high-density polyethylene with a melt index of 18 g / 10 min and high-density polyethylene with a melt index of 0.8 g / 10 min according to a mass ratio of 2-3:1.

[0007] The antioxidant is selected from any one of antioxidant 1010, 1076, and 168.

[0008] The glass fiber selected is an alkali-free glass fiber with a diameter of 13 to 15 μm.

[0009] The ultraviolet absorber selected is any one of ultraviolet absorbers UV-234, UV-120, UV-531, and UV-770.

[0010] The silane coupling agent selected is any one of silane coupling agents KH550, KH560, and KH570.

[0011] Furthermore, the toughening agent selected is any one of maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-octene copolymer, and maleic anhydride grafted ethylene-vinyl acetate copolymer.

[0012] Furthermore, the preparation method of the wear-resistant and anticorrosive auxiliary agent includes the following steps:

[0013] Step 1: Ultrasonically disperse the pretreated spherical carrier in deionized water according to a solid-liquid ratio of 30 to 60 g / L, and then add a grafting agent accounting for 30 to 50% of the mass of the pretreated spherical carrier, 20 to 40% of 3-hydroxy-1,3,5-pentanoic acid, 0.8 to 1.2% of p-hydroxyanisole, and 1 to 2% of ammonium chloride. After mixing and stirring evenly, keep the temperature at 100 to 120 °C for heat preservation and reaction for 20 to 40 min; after the reaction is completed, filter, wash, and dry the components of the product in sequence, and store the obtained modified spherical carrier for later use;

[0014] Step 2: Mix the irradiated modified Teflon microparticles with the modified spherical carrier accounting for 0.8 to 1.2 times its mass and an ethanol aqueous solution with a volume concentration of 90 to 95% accounting for 3 to 5 times its volume, stir evenly, and then heat up to 50 to 70 °C. Then, slowly dropwise add a modified liquid with a volume of 6 to 10% of it to the obtained mixed solution; after the dropping is completed, keep the temperature at 60 to 70 °C for heat preservation and reaction for 2 to 3 h; after the reaction is completed, naturally cool the components of the product to room temperature, and then filter and vacuum dry in sequence to obtain the wear-resistant and anticorrosive auxiliary agent.

[0015] Furthermore, the preparation method of the pretreated spherical carrier is as follows: Add trimethylammonium chloride glycidyl accounting for 3 to 8% of the mass of the spherical carrier to an aqueous dispersion of the spherical carrier with a concentration of 10 to 30 g / L, ultrasonically disperse for 20 to 30 min, and then perform centrifugal separation and drying on the components of the obtained product to obtain the pretreated spherical carrier.

[0016] Further, the preparation method of the grafting agent is as follows: deacetylated chitin is put into isopropanol according to a dosage ratio of 0.02 - 0.05 g / mL, ultrasonically dispersed for 30 - 50 min, then glycidyltrimethylammonium chloride with a mass 3 - 5 times that of deacetylated chitin is added, and after mixing and stirring evenly, the mixture is kept at a temperature of 60 - 80 °C for 3 - 6 h for reaction; after the reaction is completed, it is successively subjected to washing and drying treatments to obtain the grafting agent.

[0017] Further, the preparation method of the modification liquid is as follows: vinyltrimethoxysilane with a volume of 10 - 15% of an ethanol aqueous solution with a volume concentration of 80 - 90% is added thereto, mixed and stirred for 5 - 8 h, and then its pH is adjusted to 3 - 3.5 with dilute hydrochloric acid, and the obtained product is the modification liquid.

[0018] Further, the irradiation dose of the Teflon particles is 500 - 1000 KGy, and the irradiation time is 5 - 10 days; and the particle size of the Teflon particles is 2 - 5 μm.

[0019] Further, the preparation method of the spherical carrier is as follows: an aqueous dispersion of porous alumina microspheres with a concentration of 5 - 15 g / L is added with an aqueous cerium nitrate solution with a volume of 3 - 6% of it and a concentration of 2 - 3 mol / L, ultrasonically dispersed evenly, and then kept at a temperature of 120 - 160 °C for 10 - 20 h for reaction; after the reaction is completed, the product components are naturally cooled to room temperature, and after centrifugal separation, the obtained filter cake is alternately washed 3 - 4 times with deionized water and absolute ethanol; after the washing is completed, it is further subjected to vacuum drying to obtain the spherical carrier.

[0020] Further, the preparation method of the porous alumina microspheres is as follows: aluminum hydroxide and deionized water are mixed according to a mass ratio of 1:0.6 - 0.8, and after ball milling treatment, ammonium bicarbonate with a mass of 3 - 8% of aluminum hydroxide and an aqueous solution of polyvinyl alcohol with a concentration of 2 - 3% and a concentration of 6 - 10 wt% are added, and stirred at a rate of 1200 - 1500 r / min for 60 - 90 min; the obtained mixed slurry is spray-dried and then calcined at a high temperature of 730 - 780 °C for 1 - 2 h; after sintering is completed, it is further subjected to vibrating screening to obtain porous alumina microspheres with a particle size of 25 - 45 μm.

[0021] A preparation method of a wear-resistant and corrosion-resistant polyethylene composite material for a roller includes the following steps: accurately weigh each raw material required for preparing the polyethylene composite material, put it into a high-speed stirring device, mix and stir evenly, transfer the obtained mixed material to a twin-screw extruder for basic granulation to obtain the wear-resistant and corrosion-resistant polyethylene composite material for a roller;

[0022] Among them, the parameter settings for twin-screw extrusion are as follows: the temperature of the first stage is 180 - 200 °C, and the temperature from the second stage to the tenth stage is 200 - 240 °C; the head temperature is 235 °C, the main machine speed is 350 - 500 rpm, and the feeding rate is 30 - 50 rpm.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The present invention uses aluminum hydroxide, ammonium bicarbonate, and an aqueous solution of polyvinyl alcohol as raw materials to prepare porous alumina microspheres with a porous spherical morphology. Then, the porous alumina microspheres are uniformly dispersed in an aqueous solution of cerium nitrate. After heat preservation reaction, a dense nano-ceria film layer is deposited on the surface and inside the porous structure of the porous alumina microspheres to obtain a spherical carrier. The obtained spherical carrier is pretreated with glycidyltrimethylammonium chloride and then dispersed in deionized water. Then, a grafting agent, 3-hydroxy-1,3,5-pentanetricarboxylic acid, p-methoxyphenol, and ammonium chloride are added thereto. Under the action of ammonium chloride, the grafting agent that reacts with 3-hydroxy-1,3,5-pentanetricarboxylic acid is chemically bonded to the surface and in the porous structure of the pretreated spherical carrier. Finally, under the mutual cooperation of the grafting agent, 3-hydroxy-1,3,5-pentanetricarboxylic acid, and the nano-ceria film layer, the antibacterial performance of the wear-resistant and anticorrosive additive is significantly improved.

[0025] The obtained modified spherical carrier and polytetrafluoroethylene particles are dispersed in an aqueous ethanol solution, and a modifying solution is dropped therein. After heat preservation reaction, the modified spherical carrier is bonded to the polytetrafluoroethylene particles through vinyltrimethoxysilane. Finally, a considerable amount of modified spherical carrier is grafted on the surface of the polytetrafluoroethylene particles, that is, a wear-resistant and anticorrosive additive is prepared. Since the prepared porous alumina microspheres have a spherical structure and can play a good "ball bearing" effect, they have excellent wear resistance. Moreover, the presence of the nano-ceria film layer on their surface further improves their wear resistance. Since polytetrafluoroethylene itself has good wear resistance, the modified spherical carrier is grafted on the surface of the polytetrafluoroethylene particles through vinyltrimethoxysilane. Finally, under the mutual cooperation of the modified spherical carriers, the prepared wear-resistant and anticorrosive additive has more excellent wear resistance.

[0026] To sum up, using the wear-resistant and anticorrosive additive prepared by the present invention as a raw material for polyethylene composites can not only significantly improve the wear resistance of polyethylene composites and ensure their quality and quality, but also significantly improve their antibacterial and anticorrosive properties, effectively reducing the probability that the service life of polyethylene composites is shortened due to microbial growth and corrosion, and extending their service life to a certain extent. Detailed implementation mode

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1

[0029] A wear-resistant and corrosion-resistant polyethylene composite material for idlers. The polyethylene composite material is composed of the following raw materials in parts by weight: 50 parts of compound polyethylene, 20 parts of glass fiber, 2 parts of molybdenum disulfide, 4 parts of ammonium polyphosphate, 2 parts of polyethylene wax, 5 parts of nano-titanium dioxide, 0.8 part of graphene, 5 parts of maleic anhydride grafted polyethylene, 0.8 part of antioxidant 1010, 0.5 part of ultraviolet absorber UV-234, 0.3 part of silane coupling agent KH550 and 3 parts of wear-resistant and corrosion-resistant auxiliary agent; wherein, the compound polyethylene is compounded from high-density polyethylene with a melt index of 18 g / 10 min and high-density polyethylene with a melt index of 0.8 g / 10 min according to a mass ratio of 2:1; the glass fiber is non-alkali glass fiber with a diameter of 13 μm.

[0030] The preparation method of the wear-resistant and corrosion-resistant auxiliary agent includes the following steps:

[0031] Step 1: Ultrasonically disperse the pretreated spherical carrier in deionized water according to a solid-liquid ratio of 30 g / L, and then add a grafting agent accounting for 30% of the mass of the pretreated spherical carrier, 20% of 3-hydroxy-1,3,5-pentanetricarboxylic acid, 0.8% of p-hydroxyanisole, and 1% of ammonium chloride. After mixing and stirring evenly, keep the temperature at 100 °C for 40 min for heat preservation reaction; after the reaction is completed, filter, wash, and dry the components of the product in sequence, and store the obtained modified spherical carrier for later use;

[0032] Among them, the preparation method of the grafting agent is: put chitosan in isopropanol according to a dosage ratio of 0.02 g / mL, ultrasonically disperse for 30 min, then add glycidyltrimethylammonium chloride with a mass 3 times that of chitosan, mix and stir evenly, and keep the temperature at 60 °C for 3 h for heat preservation reaction; after the reaction ends, wash and dry in sequence to obtain the grafting agent;

[0033] Step 2: Mix the irradiated modified Teflon particles evenly with the modified spherical carrier accounting for 0.8 times its mass and 3 times the volume concentration of 90% ethanol aqueous solution, then heat up to 50 °C, and then slowly drop 6% of the modified liquid by volume into the obtained mixed solution; after the dropping is completed, keep the temperature at 60 °C for 2 h for heat preservation reaction; after the reaction is completed, naturally cool the components of the obtained product to room temperature, and then filter and vacuum dry in sequence to obtain the wear-resistant and corrosion-resistant auxiliary agent;

[0034] Among them, the preparation method of the modified liquid is as follows: vinyltrimethoxysilane with a volume of 10% of the ethanol aqueous solution with a volume concentration of 80% is added thereto, and after mixing and stirring for 5 h, its pH is adjusted to 3 with dilute hydrochloric acid, and the obtained product is the modified liquid;

[0035] The irradiation dose of the Teflon particles is 500 KGy, and the irradiation time is 10 days; and the particle size of the Teflon particles is 2 μm.

[0036] The preparation method of the pretreated spherical carrier is as follows: trimethylammonium chloride glycidyl with a mass of 3% of the spherical carrier is added to the aqueous dispersion of the spherical carrier with a concentration of 10 g / L, and after ultrasonic dispersion for 20 min, the obtained product components are centrifuged and dried to obtain the pretreated spherical carrier.

[0037] The preparation method of the spherical carrier is as follows: an aqueous cerium nitrate solution with a volume of 3% of the aqueous dispersion of porous alumina microspheres with a concentration of 5 g / L and a concentration of 2 mol / L is added thereto, and after ultrasonic dispersion and uniform mixing, it is kept at a temperature of 120 °C for reaction for 10 h; after the reaction is completed, the product components are naturally cooled to room temperature, and after centrifugation, the obtained filter cake is alternately washed 3 times with deionized water and absolute ethanol; after washing is completed, it is vacuum dried to obtain the spherical carrier.

[0038] The preparation method of the porous alumina microspheres is as follows: aluminum hydroxide and deionized water are mixed at a mass ratio of 1:0.6, and after ball milling, ammonium bicarbonate with a mass of 3% of aluminum hydroxide and an aqueous solution of polyvinyl alcohol with a concentration of 2% and a concentration of 6 wt% are added, and the mixture is stirred at a rate of 1200 r / min for 60 min; the obtained mixed slurry is spray dried and then calcined at a high temperature of 730 °C for 2 h; after sintering is completed, it is vibrated and sieved to obtain porous alumina microspheres with a particle size of 25 μm.

[0039] A preparation method of a wear-resistant and corrosion-resistant polyethylene composite material for a roller includes the following steps: accurately weighing each raw material required for preparing the polyethylene composite material, and putting them into a high-speed stirring device, mixing and stirring evenly, and transferring the obtained mixed material to a twin-screw extruder for basic granulation to obtain the wear-resistant and corrosion-resistant polyethylene composite material for a roller;

[0040] Among them, the parameter settings for twin-screw extrusion are as follows: the temperature of the first section is 180 °C, and the temperatures of the second to tenth sections are 200 °C; the head temperature is 235 °C, the main machine speed is 350 rpm, and the feeding rate is 30 rpm.

[0041] Example 2

[0042] The preparation method of a wear-resistant and corrosion-resistant polyethylene composite material for idler rollers provided in this embodiment is basically the same as that in Embodiment 1, except that: the specific composition of the wear-resistant and corrosion-resistant polyethylene composite material for idler rollers and the preparation method of the wear-resistant and corrosion-resistant auxiliary agent are not exactly the same. The specific composition of the wear-resistant and corrosion-resistant polyethylene composite material for idler rollers and the preparation method of the wear-resistant and corrosion-resistant auxiliary agent in this embodiment are as follows:

[0043] A wear-resistant and corrosion-resistant polyethylene composite material for idler rollers, and the polyethylene composite material is composed of the following raw materials in parts by weight: 70 parts of compound polyethylene, 25 parts of glass fiber, 3 parts of molybdenum disulfide, 5 parts of ammonium polyphosphate, 3 parts of polyethylene wax, 6 parts of nano-titanium dioxide, 1 part of graphene, 6 parts of maleic anhydride grafted polyethylene, 1.2 parts of antioxidant 1076, 0.8 part of ultraviolet absorber UV-120, 0.5 part of silane coupling agent KH560, and 4 parts of wear-resistant and corrosion-resistant auxiliary agent; wherein, the compound polyethylene is compounded from high-density polyethylene with a melt index of 18 g / 10 min and high-density polyethylene with a melt index of 0.8 g / 10 min according to a mass ratio of 2:1; the glass fiber is non-alkali glass fiber with a diameter of 13 μm.

[0044] The preparation method of the wear-resistant and corrosion-resistant auxiliary agent includes the following steps:

[0045] Step 1: Ultrasonically disperse the pretreated spherical carrier in deionized water according to a solid-liquid ratio of 50 g / L, and then add a grafting agent accounting for 40% of the mass of the pretreated spherical carrier, 30% of 3-hydroxy-1,3,5-pentanoic acid, 1% of p-hydroxyanisole, and 1.5% of ammonium chloride. After mixing and stirring evenly, keep the temperature at 110 °C for 30 min for reaction; after the reaction is completed, filter, wash, and dry the components of the product in sequence, and store the obtained modified spherical carrier for later use;

[0046] Among them, the preparation method of the grafting agent is: put chitosan in isopropanol according to a dosage ratio of 0.03 g / mL, ultrasonically disperse for 40 min, then add glycidyltrimethylammonium chloride with a mass 5 times that of chitosan, mix and stir evenly, and keep the temperature at 70 °C for 5 h for reaction; after the reaction ends, wash and dry in sequence to obtain the grafting agent;

[0047] Step 2: Mix the irradiated modified Teflon particles with the modified spherical carrier with a mass 1 time that of it and 4 times the volume concentration of 90% ethanol aqueous solution, stir evenly, and then heat up to 60 °C. Then, slowly drop 8% of the modified liquid by volume into the obtained mixed solution; after the dropping is completed, keep the temperature at 65 °C for 3 h for reaction; after the reaction is completed, naturally cool the components of the product to room temperature, and then filter and vacuum dry in sequence to obtain the wear-resistant and corrosion-resistant auxiliary agent;

[0048] Among them, the preparation method of the modification liquid is as follows: vinyltrimethoxysilane with a volume of 15% of the ethanol aqueous solution with a volume concentration of 85% is added thereto, and after mixing and stirring for 6 h, its pH is adjusted to 3 with dilute hydrochloric acid, and the obtained product is the modification liquid;

[0049] The irradiation dose of the Teflon microparticles is 800 KGy, and the irradiation time is 8 days; and the particle size of the Teflon microparticles is 3 μm.

[0050] The preparation method of the pretreated spherical carrier is as follows: trimethylammonium glycidyl chloride with a mass of 5% of the spherical carrier is added to the aqueous dispersion of the spherical carrier with a concentration of 20 g / L, and after ultrasonic dispersion for 25 min, the obtained product components are centrifuged and dried to obtain the pretreated spherical carrier.

[0051] The preparation method of the spherical carrier is as follows: an aqueous cerium nitrate solution with a volume of 5% of the aqueous dispersion of porous alumina microspheres with a concentration of 10 g / L and a concentration of 2 mol / L is added thereto, and after ultrasonic dispersion and uniform mixing, it is kept at a temperature of 150 °C for 15 h for reaction; after the reaction is completed, the product components are naturally cooled to room temperature, and after centrifugation, the obtained filter cake is alternately washed 4 times with deionized water and absolute ethanol; after washing is completed, it is further vacuum dried to obtain the spherical carrier.

[0052] The preparation method of the porous alumina microspheres is as follows: aluminum hydroxide and deionized water are mixed at a mass ratio of 1:0.7, and after ball milling, ammonium bicarbonate with a mass of 6% of aluminum hydroxide and an aqueous solution of polyvinyl alcohol with a concentration of 8 wt% and a mass of 3% are added, and stirred at a rate of 1500 r / min for 80 min; the obtained mixed slurry is spray dried and then calcined at a high temperature of 750 °C for 2 h; after sintering is completed, it is further subjected to vibrating screening to obtain porous alumina microspheres with a particle size of 30 μm.

[0053] Example 3

[0054] The preparation method of a wear-resistant and corrosion-resistant polyethylene composite material for a idler provided in this example is basically the same as that in Example 1, except that: the specific composition of the wear-resistant and corrosion-resistant polyethylene composite material for a idler and the preparation method of the wear-resistant and corrosion-resistant auxiliary agent are not completely the same. The specific composition of the wear-resistant and corrosion-resistant polyethylene composite material for a idler and the preparation method of the wear-resistant and corrosion-resistant auxiliary agent in this example are as follows:

[0055] A wear-resistant and anti-corrosive polyethylene composite material for idlers. The polyethylene composite material is composed of the following raw materials in parts by weight: 80 parts of compound polyethylene, 30 parts of glass fiber, 3 parts of molybdenum disulfide, 8 parts of ammonium polyphosphate, 5 parts of polyethylene wax, 8 parts of nano-titanium dioxide, 1.5 parts of graphene, 8 parts of maleic anhydride grafted polyethylene, 1.5 parts of antioxidant 168, 1 part of ultraviolet absorber UV-531, 0.8 part of silane coupling agent KH570, and 5 parts of wear-resistant and anti-corrosive auxiliary agent; among them, the compound polyethylene is compounded from high-density polyethylene with a melt index of 18 g / 10 min and high-density polyethylene with a melt index of 0.8 g / 10 min according to a mass ratio of 2:1; the glass fiber is non-alkali glass fiber with a diameter of 13 μm.

[0056] The preparation method of the wear-resistant and anti-corrosive auxiliary agent includes the following steps:

[0057] Step 1: Ultrasonically disperse the pretreated spherical carrier in deionized water according to a solid-liquid ratio of 60 g / L, then add a grafting agent accounting for 50% of the mass of the pretreated spherical carrier, 40% of 3-hydroxy-1,3,5-pentanetricarboxylic acid, 1.2% times of p-hydroxyanisole, and 2% of ammonium chloride. After mixing and stirring evenly, keep the temperature at 120 °C for 20 min for heat preservation reaction; after the reaction is completed, filter, wash, and dry the components of the product in sequence, and store the obtained modified spherical carrier for later use;

[0058] Among them, the preparation method of the grafting agent is: put chitosan in isopropanol according to a dosage ratio of 0.05 g / mL, ultrasonically disperse for 50 min, then add glycidyltrimethylammonium chloride with a mass 5 times that of chitosan, mix and stir evenly, and keep the temperature at 80 °C for 6 h for heat preservation reaction; after the reaction ends, wash and dry in sequence to obtain the grafting agent;

[0059] Step 2: Mix the irradiated modified Teflon particles with the modified spherical carrier 1.2 times its mass and 5 times the volume concentration of 95% ethanol aqueous solution, stir evenly, and heat up to 70 °C. Then slowly add 10% of the modified liquid by volume to the obtained mixed solution; after the addition is completed, keep the temperature at 70 °C for 3 h for heat preservation reaction; after the reaction is completed, naturally cool the components of the obtained product to room temperature, and then filter and vacuum dry in sequence to obtain the wear-resistant and anti-corrosive auxiliary agent;

[0060] Among them, the preparation method of the modified liquid is: add vinyltrimethoxysilane with a volume of 15% of the volume concentration of 90% ethanol aqueous solution, mix and stir for 8 h, and adjust its pH to 3.5 with dilute hydrochloric acid. The obtained product is the modified liquid;

[0061] The irradiation dose of the Teflon particles is 1000 KGy, and the irradiation time is 5 days; and the particle size of the Teflon particles is 2 μm.

[0062] The preparation method of the pretreated spherical carrier is as follows: Add trimethylammonium glycidyl chloride with a mass of 8% of the spherical carrier to the aqueous dispersion of the spherical carrier with a concentration of 30 g / L. After ultrasonic dispersion for 30 min, perform centrifugal separation and drying treatment on the obtained product components to obtain the pretreated spherical carrier.

[0063] The preparation method of the spherical carrier is as follows: Add an aqueous cerium nitrate solution with a volume of 6% of it and a concentration of 3 mol / L to the aqueous dispersion of porous alumina microspheres with a concentration of 15 g / L. After ultrasonic dispersion evenly, keep the temperature at 160 °C for 20 h for the reaction; after the reaction is completed, naturally cool the product components to room temperature, and alternately wash the obtained filter cake 4 times with deionized water and absolute ethanol after centrifugal separation; after washing, perform vacuum drying on it to obtain the spherical carrier.

[0064] The preparation method of the porous alumina microspheres is as follows: Mix aluminum hydroxide and deionized water according to a mass ratio of 1:0.8. After ball milling, add ammonium bicarbonate with a mass of 8% of aluminum hydroxide and an aqueous solution of polyvinyl alcohol with a concentration of 3% and a concentration of 10 wt% thereto, and stir at a rate of 1500 r / min for 90 min; the obtained mixed slurry is spray-dried and then calcined at a high temperature of 780 °C for 2 h; after sintering, perform vibrating screening on it to obtain porous alumina microspheres with a particle size of 30 μm.

[0065] Comparative Example 1: The main difference between this comparative example and Example 1 is that in this comparative example, an equal amount of modified spherical carrier is used to replace the wear-resistant and corrosion-resistant additive.

[0066] Comparative Example 2: The main difference between this comparative example and Comparative Example 1 is that in this comparative example, an equal amount of spherical carrier is used to replace the wear-resistant and corrosion-resistant additive.

[0067] Comparative Example 3: The main difference between this comparative example and Comparative Example 1 is that in this comparative example, an equal amount of porous alumina microspheres is used to replace the wear-resistant and corrosion-resistant additive.

[0068] Performance Test

[0069] Test the relevant performances of the wear-resistant and corrosion-resistant polyethylene composite material samples for idlers provided in Examples 1 to 3 and Comparative Examples 1 to 3 respectively, and record the obtained test data in the following table:

[0070]

[0071] By comparing and analyzing the relevant data in the table, it can be seen that the polyethylene composite material prepared by the present invention not only has excellent wear resistance and mechanical properties, but also has excellent anti-corrosion properties, which extends its service life to a certain extent and ensures its quality or quality. This shows that the wear-resistant and anti-corrosion polyethylene composite material for idlers provided by the present invention and its preparation method have a broader market prospect and are more suitable for popularization.

[0072] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0073] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A wear-resistant and anti-corrosive polyethylene composite material for idlers, characterized in that, The polyethylene composite material is composed of the following raw materials in parts by weight: 50-80 parts of compound polyethylene, 20-30 parts of glass fiber, 2-3 parts of molybdenum disulfide, 4-8 parts of ammonium polyphosphate, 2-5 parts of polyethylene wax, 5-8 parts of nano titanium dioxide, 0.8-1.5 parts of graphene, 5-8 parts of toughening agent, 0.8-1.5 parts of antioxidant, 0.5-1 part of ultraviolet absorber, 0.3-0.8 part of silane coupling agent and 3-5 parts of wear-resistant and anticorrosive auxiliary agent; Among them, the compound polyethylene is prepared by compounding high-density polyethylene with a melt index of 18 g / 10 min and high-density polyethylene with a melt index of 0.8 g / 10 min according to a mass ratio of 2-3:1; The preparation method of the wear-resistant and anticorrosive auxiliary agent includes the following steps: Step 1: Ultrasonically disperse the pretreated spherical carrier in deionized water according to a solid-liquid ratio of 30-60 g / L, and then add a grafting agent accounting for 30-50% of the mass of the pretreated spherical carrier, 20-40% of 3-hydroxy-1,3,5-pentanoic acid, 0.8-1.2% of p-hydroxyanisole, and 1-2% of ammonium chloride. After mixing and stirring evenly, keep the temperature at 100-120 °C for heat preservation reaction for 20-40 min; after the reaction is completed, filter, wash and dry the components of the product in sequence, and store the obtained modified spherical carrier for later use; Step 2: Mix and stir evenly the irradiated modified Teflon particles with the modified spherical carrier 0.8-1.2 times its mass and the ethanol aqueous solution with a volume concentration of 90-95% 3-5 times its volume, and then heat up to 50-70 °C, and then slowly dropwise add a modified liquid with a volume of 6-10% of it to the obtained mixed solution; after the dropping is completed, keep the temperature at 60-70 °C for heat preservation reaction for 2-3 h; after the reaction is completed, naturally cool the components of the obtained product to room temperature, and then filter and vacuum dry in sequence to obtain the wear-resistant and anticorrosive auxiliary agent; The preparation method of the pretreated spherical carrier is: add trimethylammonium glycidyl chloride accounting for 3-8% of the mass of the spherical carrier to the aqueous dispersion of the spherical carrier with a concentration of 10-30 g / L, ultrasonically disperse for 20-30 min, and then perform centrifugal separation and drying treatment on the components of the obtained product to obtain the pretreated spherical carrier; The preparation method of the grafting agent is: put chitosan in isopropanol according to a dosage ratio of 0.02-0.05 g / mL, ultrasonically disperse for 30-50 min, then add trimethylammonium glycidyl chloride 3-5 times the mass of chitosan, mix and stir evenly, and keep the temperature at 60-80 °C for heat preservation reaction for 3-6 h; after the reaction is completed, wash and dry in sequence to obtain the grafting agent; The preparation method of the modified liquid is: add vinyltrimethoxysilane with a volume of 10-15% of the volume of the ethanol aqueous solution with a volume concentration of 80-90%, mix and stir for 5-8 h, and then adjust its pH to 3-3.5 with dilute hydrochloric acid, and the obtained is the modified liquid; The preparation method of the spherical carrier is as follows: Add an aqueous cerium nitrate solution with a concentration of 2 - 3 mol / L and a volume of 3 - 6% of the aqueous dispersion of porous alumina microspheres with a concentration of 5 - 15 g / L. After ultrasonic dispersion, keep the temperature at 120 - 160 °C for 10 - 20 h for reaction; after the reaction is completed, naturally cool the product components to room temperature, and alternately wash the obtained filter cake with deionized water and absolute ethanol for 3 - 4 times; after washing, conduct vacuum drying, and the obtained product is the spherical carrier.

2. The wear-resistant and anti-corrosive polyethylene composite material for a idler according to claim 1, characterized in that: The toughening agent is selected from any one of maleic anhydride grafted polyethylene, maleic anhydride grafted ethylene-octene copolymer, and maleic anhydride grafted ethylene-vinyl acetate copolymer.

3. The wear-resistant and corrosion-proof polyethylene composite material for a roller according to claim 1, characterized in that: The irradiation dose of the Teflon microparticles is 500 - 1000 KGy, and the irradiation time is 5 - 10 days; and the particle size of the Teflon microparticles is 2 - 5 μm.

4. The wear-resistant and anti-corrosive polyethylene composite material for a carrying roller according to claim 1, wherein, The preparation method of the porous alumina microspheres is as follows: Mix aluminum hydroxide and deionized water according to a mass ratio of 1:0.6 - 0.8, add ammonium bicarbonate with a mass of 3 - 8% of aluminum hydroxide and an aqueous solution of polyvinyl alcohol with a concentration of 6 - 10 wt% and a mass of 2 - 3% after ball milling, and stir at a rate of 1200 - 1500 r / min for 60 - 90 min; spray dry the obtained mixed slurry and then conduct high-temperature calcination at a temperature of 730 - 780 °C for 1 - 2 h. After sintering, conduct vibration screening to obtain porous alumina microspheres with a particle size of 25 - 45 μm.

5. A method for preparing a wear-resistant and corrosion-resistant polyethylene composite material for a carrying roller according to any one of claims 1 to 4, characterized in that, It includes the following steps: Accurately weigh each raw material required for preparing the polyethylene composite material, put it into a high-speed stirring device, mix and stir evenly, transfer the obtained mixed material to a twin-screw extruder for extrusion granulation, and the obtained product is the wear-resistant and corrosion-resistant polyethylene composite material for idlers. Among them, the parameter settings for twin-screw extrusion are as follows: the temperature of the first section is 180 - 200 °C, and the temperature of the second to tenth sections is 200 - 240 °C; the head temperature is 235 °C, the main machine speed is 350 - 500 rpm, and the feeding rate is 30 - 50 rpm.

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