CN110078996B - Self-lubricating high-density polyethylene pipe for coal mine and preparation method thereof - Google Patents
Self-lubricating high-density polyethylene pipe for coal mine and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a self-lubricating high-density polyethylene pipe for a coal mine and a preparation method thereof. The self-lubricating high-density polyethylene pipe for the coal mine comprises the following components in parts by weight: 60-80 parts of high-density polyethylene, 13-18 parts of modified ultrahigh molecular weight polyethylene, 8-10 parts of lubricant, 4-8 parts of corrosion-resistant modifier, 5-10 parts of coupling agent, 6-10 parts of flame retardant, 12-17 parts of polyethylene fiber, 6-10 parts of reinforcing filler and 5-10 parts of hollow glass microsphere; the lubricant is prepared by mixing the following components: boron nitride, sodium hyaluronate, polyethylene wax, 1-3 parts of ethyl cellulose and silicone oil; the corrosion-resistant modifier is prepared by mixing and grinding the following components: polytetrafluoroethylene, diatomite, silicon carbide and titanium dioxide. The self-lubricating high-density polyethylene pipe for the coal mine has the advantages of good self-lubricating property and corrosion resistance, difficult scaling and strong conveying capacity.
Description
Technical Field
The invention relates to the technical field of pipes for coal mines, in particular to a self-lubricating high-density polyethylene pipe for coal mines and a preparation method thereof.
Background
The mine conveying pipe is a conveying pipeline for supplying and draining water, ventilating, grouting, discharging gas and the like in a mine, and in the 60 s, hard PVC is used as a conveying pipeline abroad, but the conveying pipeline is easy to break and has poor wear resistance due to poor low-temperature performance. After 70 years, the pipe is gradually replaced by HDPE pipe, and the HDPE pipe is widely used because of good corrosion resistance, good low-temperature toughness, good creep resistance and long service life, and the service temperature is lower than-40 ℃.
In the prior art, a chinese patent application No. 201811306079.5 discloses a high density polyethylene HDPE corrugated pipe and a preparation method thereof, which is prepared from the following raw materials in parts by weight: 100-120 parts of HDPE/graphene oxide/calcium carbonate modified composite material, 20-40 parts of glass fiber, 15-30 parts of alumina, 10-15 parts of polyethylene wax, 5-10 parts of antioxidant, 5-10 parts of basalt, 1-5 parts of silicon dioxide, 1-5 parts of bentonite, 1-5 parts of lubricant, 2-7 parts of benzoyl peroxide, 2-6 parts of pentaerythritol and 1-3 parts of coupling agent.
The existing high-density polyethylene corrugated pipe is good in mechanical property and flexibility and strong in ageing resistance, but when the high-density polyethylene corrugated pipe is used for conveying water in a coal mine, because the pipe is large in roughness, the resistance of the water flowing in a pipeline is large, the conveying capacity of the pipe is poor, the contents of sulfur, calcium, phosphorus and other ions in the discharged water of the coal mine are high, the pipe is easy to accumulate and scale in the pipe, and the pipe is corroded, so that the problem to be solved is to develop the high-density polyethylene pipe which is good in self-lubricating property and corrosion resistance, difficult to scale and strong in conveying capacity.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a self-lubricating high-density polyethylene pipe for coal mines, which has the advantages of good self-lubricating property and corrosion resistance, difficult scaling and strong conveying capacity.
The second purpose of the invention is to provide a preparation method of the self-lubricating high-density polyethylene pipe for coal mines, which has the advantages of simple preparation method and easy operation.
In order to achieve the first object, the invention provides the following technical scheme: a self-lubricating high-density polyethylene pipe for coal mines comprises the following components in parts by weight: 60-80 parts of high-density polyethylene, 13-18 parts of modified ultrahigh molecular weight polyethylene, 8-10 parts of lubricant, 4-8 parts of corrosion-resistant modifier, 5-10 parts of coupling agent, 6-10 parts of flame retardant, 12-17 parts of polyethylene fiber, 6-10 parts of reinforcing filler and 5-10 parts of hollow glass microsphere;
the lubricant is prepared by mixing the following components in parts by weight: 4-7 parts of boron nitride, 2-5 parts of sodium hyaluronate, 6-10 parts of polyethylene wax, 1-3 parts of ethyl cellulose and 6-10 parts of silicone oil;
the corrosion-resistant modifier is prepared by mixing and grinding the following components in parts by weight: 3-6 parts of polytetrafluoroethylene, 2-5 parts of diatomite, 1-3 parts of silicon carbide and 4-7 parts of titanium dioxide.
By adopting the technical scheme, as the boron nitride in the lubricant is hexagonal crystal, the boron nitride has chemical erosion resistance and is not eroded by inorganic acid, the boron nitride has small friction coefficient and good lubricating property, the ethyl cellulose can resist the erosion of acid-base solution, has good compatibility with the high-density polyethylene, is matched with sodium hyaluronate and has good lubricating property, and the polyethylene wax and the silicone oil can improve the fluidity of the high-density polyethylene and the modified high-molecular-weight polyethylene; the polytetrafluoroethylene in the corrosion-resistant modifier has the best corrosion resistance and non-aging property, the silicon carbide has high hardness, high wear resistance, high corrosion resistance and oxidation resistance, the silicon carbide can form a silicon dioxide protective layer in the air, so that the acid and alkali resistance of the pipe is improved, the titanium dioxide and the diatomite both have excellent corrosion resistance, the corrosion resistance effect of the pipe can be improved, the titanium dioxide and the diatomite have better reinforcing effect, and the problem that the mechanical property of the pipe is reduced after the high-density polyethylene and the ultrahigh molecular weight polyethylene are mixed can be solved.
The modified ultra-high molecular weight polyethylene is mixed with the high-density polyethylene to be used as matrix resin of the pipe, the modified ultra-high molecular weight polyethylene has ultra-high wear resistance, self-lubrication, chemical stability and aging resistance, the bending strength, creep property, surface hardness, rigidity and thermal deformation temperature of the pipe are improved, and the modified ultra-high molecular weight polyethylene and the lubricant cooperate with each other to reduce the friction coefficient of the pipe, so that the self-lubrication of the pipe is further improved; the polyethylene fiber has high strength, low density and good compatibility with high-density polyethylene, can enhance the bending strength and toughness of the high-density polyethylene pipe, the hollow glass microspheres are micron-sized hollow spheres, have the advantages of light weight, low heat conduction, good chemical stability and the like, are mixed in the raw material of the pipe, the spherical hollow glass microspheres have good fluidity, can increase the melt fluidity of the pipe, thereby improving the self-lubricating property of the pipe, simultaneously ensuring that the hollow glass beads have good corrosion resistance, enabling the pipe to have stronger corrosion resistance and longer service life, and the lubricant and the corrosion-resistant additive are cooperated with each component, so that the high-density polyethylene pipe has better self-lubricating property and smoother inner wall, and when fluid is conveyed, the fluid resistance is small, the conveying capacity is strong, water scale is not easy to accumulate, the corrosion resistance is improved, and the service life is long.
Further, the modified ultra-high molecular weight polyethylene is prepared by the following method: mixing 2-4 parts of graphene, 1-3 parts of flake graphite and 3-5 parts of talcum powder, adding 5-8 parts of ultrahigh molecular weight polyethylene, heating and stirring, heating to 80-100 ℃, stirring at the rotating speed of 2000-3000r/min for 3-6h, adding 2-5 parts of dicyclopentadiene resin, uniformly mixing, extruding and granulating.
By adopting the technical scheme, because graphene and crystalline flake graphite have a lamellar structure, adjacent lamellar can slide, the talcum powder has the tendency of easily splitting into crystalline flakes and special lubricity, and the graphene, the crystalline flake graphite and the talcum powder are used for modifying the ultra-high molecular weight polyethylene, so that the self-lubricity of the ultra-high molecular weight polyethylene can be improved, and the surface hardness, the creep property and the bending strength of the ultra-high molecular weight polyethylene can also be improved.
Further, the preparation method of the lubricant comprises the following steps: heating polyethylene wax to 104-130 ℃ for melting, sequentially adding silicone oil, boron nitride, sodium hyaluronate and ethyl cellulose, mixing and stirring uniformly, and cooling to obtain the lubricant.
By adopting the technical scheme, the polyethylene wax is heated and melted at first, and the residual substances are added, so that the components can be uniformly dispersed in the polyethylene wax melt, and the prepared lubricant has better performance.
Further, the molecular weight of the ultra-high molecular weight polyethylene is 350-500 ten thousand, and the melt index of the high density polyethylene is 0.2-10.
By adopting the technical scheme, the ultra-high molecular weight polyethylene with the molecular weight of 350-500 ten thousand is mixed with the high density polyethylene with the melt index of 0.2-10, so that the reduction of the mechanical property can be effectively prevented.
Further, the particle size of the corrosion resistance modifier is 0.2-0.5 μm.
By adopting the technical scheme, the particle size of the corrosion-resistant modifier is smaller, so that the corrosion-resistant modifier can be conveniently and uniformly mixed with raw materials such as high-density polyethylene, ultrahigh molecular weight polyethylene and the like, and the prepared high-density polyethylene pipe has better corrosion resistance.
Further, the flame retardant is one or a combination of more of red phosphorus, antimony trioxide and calcium bentonite.
By adopting the technical scheme, the red phosphorus is an organic halogen-free flame retardant, has excellent thermal stability, nonvolatility, no generation of corrosive gas and good flame retardant effect, is nontoxic in the using process, has good synergistic effect with the antimony trioxide and the calcium bentonite, and can ensure that the flame retardant effect is better.
Further, the coupling agent is one of titanate coupling agent NDZ-201, aluminate coupling agent DL-411 and silane coupling agent KH-570.
Further, the reinforcing filler is a mixture of polyimide, polytrimethylene terephthalate and polyethylene terephthalate with the mass ratio of 1 (0.8-10) to (0.8-1).
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of a self-lubricating high-density polyethylene pipe for coal mines comprises the following steps:
s1, mixing the high-density polyethylene, the lubricant and the corrosion-resistant modifier, and then performing blending granulation in a double-screw extruder, wherein the temperature of each section of the double-screw extruder is 200-250 ℃, and the rotating speed of a screw is 20-35r/min, so as to obtain a pretreatment material;
s2, mixing the pretreatment material with modified ultrahigh molecular weight polyethylene, polyethylene fiber and hollow glass beads at the temperature of 150 ℃ and 280 ℃ for 2-3h to prepare a semi-mixed material;
s3, adding the semi-mixed material, the reinforcing filler, the flame retardant and the coupling agent into a high-speed mixer, mixing at the rotation speed of 1500-1800r/min for 3-6min to obtain a mixed material, adding the mixed material into an extruder, extruding and molding, setting the rotation speed of a screw of the extruder at 20-60r/min and the traction speed at 0.5-10m/min, extruding, cooling and shaping by the extruder to obtain a finished product.
By adopting the technical scheme, the high-density polyethylene is firstly melted, so that the lubricant, the corrosion-resistant modifier and the high-density polyethylene are uniformly mixed, extruded and granulated, then added with the ultrahigh molecular weight polyethylene, the polyethylene fibers and the hollow glass microspheres, heated and mixed, the ultrahigh molecular weight polyethylene and the polyethylene fibers are melted, and then uniformly mixed with the hollow glass microspheres, and then mixed with the reinforcing filler, the flame retardant and the coupling agent, wherein the coupling agent can improve the compatibility of the reinforcing filler and the flame retardant with the ultrahigh molecular weight polyethylene and the high-density polyethylene, so that the reinforcing filler and the flame retardant are uniformly mixed, and the flame retardant performance and the mechanical property of the pipe are improved.
Further, the temperature of the six zones of the extruder is as follows: 165-175 deg.C, 175-185 deg.C, 190-200 deg.C, 215-225 deg.C, 220-230 deg.C.
In conclusion, the invention has the following beneficial effects:
firstly, the modified ultra-high molecular weight polyethylene and the high density polyethylene are used as matrix resin of the pipe, the self-lubricating property of the modified ultra-high molecular weight polyethylene is improved, the performances such as bending strength, creep property, strength, corrosion resistance and the like are also improved, the self-lubricating property is improved, and after the modified ultra-high molecular weight polyethylene is mixed with the high density polyethylene, the self-lubricating property of the high density polyethylene pipe can be enhanced, the mechanical property of the high density polyethylene pipe is improved, so that the inner wall of the high density polyethylene pipe is smooth, the fluid resistance is small, the conveying capacity is strong, the high density polyethylene pipe is not easy to scale, and the corrosion.
Secondly, in the invention, the lubricant is preferably prepared from the components such as boron nitride, sodium hyaluronate, ethyl cellulose and the like, and because the friction coefficient of the boron nitride is small, the sodium hyaluronate and the ethyl cellulose have better lubricating property, and the components such as the boron nitride, the sodium hyaluronate and the ethyl cellulose have excellent acid and alkali stability, the lubricant can not improve the self-lubricating property of the pipe, so that the fluid resistance in the pipeline is reduced, the pipe is not easy to scale, and the corrosion resistance of the pipe can be improved.
Thirdly, the corrosion resistance modifier is prepared by using the polytetrafluoroethylene, the diatomite, the silicon carbide and the titanium dioxide, the polytetrafluoroethylene has excellent corrosion resistance and non-aging property, and the silicon carbide has high wear resistance, high corrosion resistance and oxidation resistance, so that the corrosion resistance of the high-density polyethylene pipe is further improved, meanwhile, the titanium dioxide and the diatomite can enhance the corrosion resistance of the pipe, improve the mechanical property of the pipe and overcome the defect of mechanical reduction caused by the mixing of the ultrahigh molecular weight polyethylene and the high density polyethylene.
Detailed Description
The present invention will be described in further detail with reference to examples.
Preparation examples 1 to 3 of modified ultrahigh molecular weight polyethylene
In preparation examples 1 to 3, the graphene is selected from graphene sold by Beijing Deke island gold science and technology Co., Ltd under the trade name of CNT900, the crystalline flake graphite is selected from Qingdao Furunda graphite Co., Ltd under the trade name of FRD-QX1, the talcum powder is selected from talcum powder sold by Guangzhou Hi chemical raw materials Co., Ltd under the trade name of 400, the ultra-high molecular weight polyethylene is selected from Bolin plastic Co., Ltd XM220 of Dongguan city, and the dicyclopentadiene resin is selected from dicyclopentadiene phenol epoxy resin sold by Jiansheng Jiangde materials science and technology Co., Ltd under the trade name of DCPD 1501.
Preparation example 1: mixing 2kg of graphene, 1kg of crystalline flake graphite and 3kg of talcum powder, adding 5kg of ultra-high molecular weight polyethylene, heating and stirring the mixture to 80 ℃, stirring the mixture for 3 hours at a rotating speed of 2000r/min, adding 2kg of dicyclopentadiene resin, uniformly mixing the mixture, extruding and granulating, wherein the molecular weight of the ultra-high molecular weight polyethylene is 350 ten thousand, and the particle size of the talcum powder is 1 mu m.
Preparation example 2: mixing 3kg of graphene, 2kg of crystalline flake graphite and 4kg of talcum powder, adding 6.5kg of ultra-high molecular weight polyethylene, heating and stirring, heating to 90 ℃, stirring at the rotating speed of 2500r/min for 4.5h, adding 3.5kg of dicyclopentadiene resin, uniformly mixing, extruding and granulating, wherein the molecular weight of the ultra-high molecular weight polyethylene is 400 ten thousand, and the particle size of the talcum powder is 2 mu m.
Preparation example 3: mixing 4kg of graphene, 5kg of crystalline flake graphite and 6kg of talcum powder, adding 8kg of ultrahigh molecular weight polyethylene, heating and stirring, heating to 100 ℃, stirring at the rotating speed of 3000r/min for 6h, adding 5kg of dicyclopentadiene resin, uniformly mixing, extruding and granulating, wherein the molecular weight of the ultrahigh molecular weight polyethylene is 500 ten thousand, and the particle size of the talcum powder is 3 mu m.
Preparation examples 4 to 6 of lubricants
Preparation examples 4 to 6 the polyethylene wax was selected from polyethylene wax sold under the trade name of 100 by CycloRui plastics additives Ltd, from Shangshan, Cond, dimethyl silicone oil sold under the trade name of RC0201, from Shanghai Longyou chemical Co., Ltd, boron nitride was selected from boron nitride sold under the trade name of DH05, from Zhengzhou Keqi chemical products Co., Ltd, sodium hyaluronate was selected from sodium hyaluronate sold under the trade name of NF-008, from Xian Tianfeng Biotech Co., Ltd, and ethyl cellulose was selected from ethyl cellulose sold under the trade name of EC50, from Guangdong Yue chemical industries Co Ltd.
Preparation example 4: heating 6kg of polyethylene wax to 104 ℃ for melting, sequentially adding 6kg of silicone oil, 4kg of boron nitride, 2kg of sodium hyaluronate and 1kg of ethyl cellulose, mixing and stirring uniformly, and cooling to obtain the lubricant.
Preparation example 5: heating 8kg of polyethylene wax to 117 ℃ for melting, sequentially adding 8kg of silicone oil, 5kg of boron nitride, 4kg of sodium hyaluronate and 2kg of ethyl cellulose, mixing and stirring uniformly, and cooling to obtain the lubricant.
Preparation example 6: heating 10kg of polyethylene wax to 130 ℃ for melting, sequentially adding 10kg of silicone oil, 7kg of boron nitride, 5kg of sodium hyaluronate and 3kg of ethyl cellulose, mixing and stirring uniformly, and cooling to obtain the lubricant.
Examples
Examples 1-3 the high density polyethylene is selected from high density polyethylene sold BY Suzhou Sunbanqing plastication Co., Ltd under the brand name DMDA-8008, the polyethylene fiber is selected from polyethylene fiber sold BY Shenzhen Tanshiji science & ltd & gt under the model number TZT-XC, the hollow glass bead is selected from hollow glass bead sold BY Hebeijing aviation products Co., Ltd under the model number NH60, the red phosphorus is selected from red phosphorus sold BY Jinan Bongying flame retardant Material Co., Ltd under the model number BY, the calcium bentonite is selected from calcium bentonite sold BY Qiangdong mineral processing factory, in the country under the model number qd-011, the antimony trioxide is selected from antimony trioxide sold BY Shandong Taixing New Material Co., Ltd under the model number HT-105, the titanate coupling agent NDZ-201 is selected from titanate coupling agent NDZ-201 sold BY Dongguan Green Wei Plastic goods Co., Ltd under the model number 201, The aluminate coupling agent DL-411 is selected from aluminate coupling agent DL-411 with the product number of 411 sold by Kangjin new material science and technology Limited in Dongguan city, the silane coupling agent KH-570 is selected from silane coupling agent KH-570 with the product number of 570 sold by Jie chemical science and technology Limited in Guangzhou city, the diatomite is selected from diatomite with the product number of 001 sold by Baisheng mineral processing factory in Guizhou county, the silicon carbide is selected from silicon carbide with the product number of 0809 sold by Zhanteng mineral processing factory in Jinhou county, the titanium dioxide is selected from titanium dioxide with the product number of R902+ sold by Hebei Delang chemical technology Limited, and the polytetrafluoroethylene is selected from polytetrafluoroethylene with the product number of JF-G90 sold by Kaerda Plastic Material Limited in Taicang.
Example 1: the raw material proportion of the self-lubricating high-density polyethylene pipe for the coal mine is shown in Table 1, and the preparation method of the high-density polyethylene for the coal mine comprises the following steps:
s1, mixing 60kg of high-density polyethylene, 8kg of lubricant and 4kg of corrosion-resistant modifier, and then granulating in a double-screw extruder at the temperature of 200 ℃ and the screw rotating speed of 20r/min to obtain a pretreatment material;
the melt index of the high-density polyethylene was 0.2, the lubricant was prepared from preparation example 4, and the corrosion-resistant modifier was prepared by mixing 3kg of polytetrafluoroethylene, 2kg of diatomaceous earth, 1kg of silicon carbide and 4kg of titanium dioxide, and grinding to 0.2 μm;
s2, mixing the pretreatment material with 13kg of modified ultrahigh molecular weight polyethylene, 12kg of polyethylene fiber and 5kg of hollow glass beads at 150 ℃ for 2h to prepare a semi-mixed material, wherein the modified ultrahigh molecular weight polyethylene is prepared by the preparation example 1;
s3, adding the semi-mixed material, 6kg of reinforcing filler, 6kg of flame retardant and 5kg of coupling agent into a high-speed mixer, mixing for 3min at the rotation speed of 1500r/min to obtain a mixture, adding the mixture into an extruder, extruding and molding, setting the rotation speed of a screw of the extruder to be 20r/min and the traction speed to be 0.5m/min, extruding, cooling and sizing by the extruder to obtain a finished product, wherein the temperature of six zones of the extruder is as follows: 165 ℃, 175 ℃, 190 ℃, 215 ℃ and 220 ℃;
the reinforcing filler is a mixture of polyimide, polytrimethylene terephthalate and polyethylene terephthalate with the mass ratio of 1:0.8:0.8, the flame retardant is red phosphorus and calcium bentonite with the mass ratio of 1:1, and the coupling agent is a titanate coupling agent NDZ-201 and an aluminate coupling agent DL-411 with the mass ratio of 1: 1.
Table 1 raw material ratio of self-lubricating high density polyethylene pipe for coal mine in examples 1-3
Example 2: the raw material proportion of the self-lubricating high-density polyethylene pipe for the coal mine is shown in Table 1, and the preparation method of the high-density polyethylene for the coal mine comprises the following steps:
s1, mixing 70kg of high-density polyethylene, 9kg of lubricant and 6kg of corrosion-resistant modifier, and then granulating in a double-screw extruder at the temperature of 230 ℃ and the screw rotating speed of 30r/min to obtain a pretreatment material;
the high density polyethylene has a melt index of 5, the lubricant is prepared in preparation example 5, and the corrosion resistance modifier is prepared by mixing 4kg of polytetrafluoroethylene, 3kg of diatomite, 2kg of silicon carbide and 5kg of titanium dioxide and grinding to 0.4 μm;
s2, mixing the pretreatment material with 16kg of modified ultrahigh molecular weight polyethylene, 15kg of polyethylene fiber and 8kg of hollow glass beads at 210 ℃ for 2.5 hours to prepare a semi-mixed material, wherein the modified ultrahigh molecular weight polyethylene is prepared by the preparation example 2;
s3, adding the semi-mixed material, 8kg of reinforcing filler, 8kg of flame retardant and 8kg of coupling agent into a high-speed mixer, mixing for 5min at the rotating speed of 1600r/min to obtain a mixture, adding the mixture into an extruder, extruding and molding, setting the rotating speed of a screw of the extruder to be 40r/min and the traction speed to be 5m/min, extruding, cooling and sizing by the extruder to obtain a finished product, wherein the temperature of six zones of the extruder is as follows: 170 ℃, 180 ℃, 195 ℃, 220 ℃ and 225 ℃;
the reinforcing filler is a mixture of polyimide, polytrimethylene terephthalate and polyethylene terephthalate with the mass ratio of 1:0.9:0.9, the flame retardant is red phosphorus and antimony trioxide with the mass ratio of 1:1, and the coupling agent is an aluminate coupling agent DL-411 and a silane coupling agent KH-570 with the mass ratio of 1: 1.
Example 3: the raw material proportion of the self-lubricating high-density polyethylene pipe for the coal mine is shown in Table 1, and the preparation method of the high-density polyethylene for the coal mine comprises the following steps:
s1, mixing 80kg of high-density polyethylene, 10kg of lubricant and 8kg of corrosion-resistant modifier, and then granulating in a double-screw extruder at the temperature of 250 ℃ and the screw rotating speed of 35r/min to obtain a pretreatment material;
the high density polyethylene has a melt index of 10, the lubricant is prepared by preparation example 6, and the corrosion resistance modifier is prepared by mixing 6kg of polytetrafluoroethylene, 5kg of diatomite, 3kg of silicon carbide and 7kg of titanium dioxide and grinding to 0.5 μm;
s2, mixing the pretreatment material with 18kg of modified ultrahigh molecular weight polyethylene, 17kg of polyethylene fiber and 10kg of hollow glass beads at 280 ℃ for 3h to prepare a semi-mixed material, wherein the modified ultrahigh molecular weight polyethylene is prepared by the preparation example 3;
s3, adding the semi-mixed material, 10kg of reinforcing filler, 10kg of flame retardant and 10kg of coupling agent into a high-speed mixer, mixing for 6min at the rotation speed of 1800r/min to obtain a mixture, adding the mixture into an extruder, extruding and molding, setting the rotation speed of a screw of the extruder at 60r/min and the traction speed at 10m/min, extruding, cooling and sizing by the extruder to obtain a finished product, wherein the temperature of six zones of the extruder is as follows: 175 ℃, 185 ℃, 200 ℃, 225 ℃ and 230 ℃;
the reinforcing filler is a mixture of polyimide, polytrimethylene terephthalate and polyethylene terephthalate with the mass ratio of 1:1:1, the flame retardant is antimony trioxide and calcium bentonite with the mass ratio of 1:1, and the coupling agent is titanate coupling agent NDZ-201 and silane coupling agent KH-570 with the mass ratio of 1: 1.
Comparative example
Comparative example 1: the self-lubricating high-density polyethylene pipe for the coal mine is different from the high-density polyethylene pipe in example 1 in that modified ultrahigh molecular weight polyethylene is not added into the high-density polyethylene pipe.
Comparative example 2: a self-lubricating high-density polyethylene pipe for coal mine, which is different from the pipe in example 1 in that boron nitride is not added to the lubricant.
Comparative example 3: the self-lubricating high-density polyethylene pipe for coal mines is different from the pipe in example 1 in that sodium hyaluronate and ethyl cellulose are not added into a lubricant.
Comparative example 4: a self-lubricating high-density polyethylene pipe for coal mines is different from the pipe in example 1 in that silicon carbide and titanium dioxide are not added into a corrosion resistance modifier.
Comparative example 5: the self-lubricating high-density polyethylene pipe for coal mines is different from the pipe in example 1 in that polytetrafluoroethylene is not added into the corrosion resistance modifier.
Comparative example 6: by taking example 1 in the chinese patent application No. 201310593538.3 as a reference, the method for pretreating calcium sulfate whiskers of the present invention comprises: firstly, 60 parts by weight of calcium sulfate whisker are put into a drying oven at 120 +/-10 ℃ for drying for 3 hours, cooled to less than 70 ℃ after drying, and then put into a high-speed mixer for mixing for 5-8 minutes, wherein the rotating speed of the high-speed mixer is 2500 +/-200 revolutions per minute; then sequentially adding 4 parts by weight of dispersant Ethylene Bis Stearamide (EBS) and 3 parts by weight of titanate coupling agent NDZ-201, mixing for 2-4 minutes, then adding 20 parts by weight of Linear Low Density Polyethylene (LLDPE), mixing for 1-2 minutes, finally discharging and cooling to normal temperature to obtain the pretreated calcium sulfate whisker; the invention relates to an antistatic and flame-retardant ultra-high molecular weight polyethylene pipe for coal mines, which is prepared from 60 parts of ultra-high molecular weight polyethylene UHMWPE, 7 parts of linear low-density polyethylene LLDPE, 8 parts of acrylonitrile-chlorinated polyethylene-styrene copolymer ACS, 2 parts of high polymer wax (the high polymer wax is PE-110D type high polymer wax provided by Beijing Tian Hengjian technology development Limited), 10 parts of superconducting carbon black CB, 8 parts of red phosphorus, 10 parts of antimony trioxide, 28 parts of pretreated calcium sulfate whisker, 2 parts of barium sulfate and 2 parts of titanate coupling agent NDZ-2012 by weight; the molecular weight of the adopted ultra-high molecular weight polyethylene UHMWPE is 200-1000 ten thousand units.
Performance test
Pipes were produced according to the methods in examples 1 to 3 and comparative examples 1 to 6 and the various properties of the pipes were tested according to the following criteria and the test results are reported in table 2:
1. elongation at break: testing is carried out according to GB/T8804.1-2003 part 1 of thermoplastic plastic pipe tensile property measurement; 2. tensile strength: testing is carried out according to GB/T8804.1-2003 part 1 of thermoplastic plastic pipe tensile property measurement; 3. friction coefficient of inner wall of pipe: according to YD/T841.1-2016 part 1 of plastic pipe for underground communication pipelines: the static friction coefficient was measured by the plate method, appendix A of general rules;
4. acid corrosion resistance: the pipes prepared in each example and each proportion are placed in a sulfuric acid solution with the concentration of 98 percent, soaked for 30min, and the elongation at break and the tensile strength are detected according to GB/T8804.1-2003 part 1 of thermoplastic pipe tensile property measurement; 5. alkali corrosion resistance: the pipes prepared in each example and each comparative example were placed in a 10% sodium hydroxide solution and immersed for 30min, and the elongation at break and the tensile strength were measured according to GB/T8804.1-2003 part 1 of thermoplastic pipe tensile Properties measurement.
Table 2 results of performance testing of pipes prepared in each example and each comparative example
As can be seen from the data in table 2, the high density polyethylene pipes prepared by the methods in examples 1 to 3 have good mechanical properties, small friction coefficient of the inner wall of the pipe, and less decrease in mechanical properties after being soaked in an acid solution and an alkali solution, which indicates that the high density polyethylene pipes prepared by the present invention have smooth inner walls, small resistance, strong conveying ability, and good corrosion resistance of the pipes, and are not easy to scale in the pipes when conveying fluids such as water.
Comparative example 1 because modified ultra-high molecular weight polyethylene is not added to the high density polyethylene pipe raw material, it can be seen from the detection results that, compared with examples 1-3, the mechanical property of the pipe prepared in comparative example 1 is reduced, the friction coefficient of the inner wall of the pipe is increased, and the acid and alkali resistance is reduced, which indicates that the inner wall of the pipe can be smooth by adding the modified ultra-high molecular weight polyethylene, so that scaling is not easy to occur in the pipe, and the fluid conveying capacity and the corrosion resistance of the pipe are improved.
Comparative example 2 because boron nitride was not added to the lubricant, the elongation at break and tensile strength of the high density polyethylene pipe prepared in comparative example 2 were comparable to those of examples 1-3, but after soaking in the acid solution and the alkali solution, the elongation at break and tensile strength of the pipe were significantly reduced, and the friction coefficient of the inner wall of the pipe was increased, indicating that the addition of boron nitride can significantly improve the smoothness of the inner wall of the pipe and improve the corrosion resistance of the pipe.
Comparative example 3 since sodium hyaluronate and ethylcellulose were not added to the lubricant, it can be seen from the data in table 2 that the friction coefficient of the inner wall of the pipe is significantly increased, but the elongation at break and tensile strength are not greatly increased, as compared with the high density polyethylene pipes prepared in examples 1-3, and before and after the pipe is soaked in the acid solution and the alkali solution, the elongation at break and tensile strength of the pipe are not greatly changed, which indicates that the addition of sodium hyaluronate and ethylcellulose can improve the smoothness of the high density polyethylene pipe, reduce the friction coefficient, increase the fluid transport capacity, and make the inside of the pipe not easily scale.
Comparative example 4 since silicon carbide and titanium dioxide were not added to the corrosion resistance modifier, it can be seen from the data in table 2 that the elongation at break, tensile strength, and inner wall friction coefficient of the pipe prepared in comparative example 4 are not much different from those of examples 1 to 3, but the elongation at break and tensile strength are significantly deteriorated after soaking in the acid solution and the alkali solution, indicating that the corrosion resistance of the pipe can be improved by adding silicon carbide and titanium dioxide.
Comparative example 5 since polytetrafluoroethylene was not added to the corrosion resistance modifier, the elongation at break and tensile strength of the high density polyethylene pipe prepared in comparative example 5 were significantly deteriorated after soaking in an acid solution and an alkali solution, indicating that the corrosion resistance of the high density polyethylene pipe can be improved by adding polytetrafluoroethylene.
Comparative example 6 is a pipe prepared by the prior art, and the data in the table show that the pipe prepared by the invention has better mechanical property, small friction coefficient of the inner wall of the pipe and strong corrosion resistance.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The self-lubricating high-density polyethylene pipe for the coal mine is characterized by comprising the following components in parts by weight: 60-80 parts of high-density polyethylene, 13-18 parts of modified ultrahigh molecular weight polyethylene, 8-10 parts of lubricant, 4-8 parts of corrosion-resistant modifier, 5-10 parts of coupling agent, 6-10 parts of flame retardant, 12-17 parts of polyethylene fiber, 6-10 parts of reinforcing filler and 5-10 parts of hollow glass microsphere;
the lubricant is prepared by mixing the following components in parts by weight: 4-7 parts of boron nitride, 2-5 parts of sodium hyaluronate, 6-10 parts of polyethylene wax, 1-3 parts of ethyl cellulose and 6-10 parts of silicone oil;
the corrosion-resistant modifier is prepared by mixing and grinding the following components in parts by weight: 3-6 parts of polytetrafluoroethylene, 2-5 parts of diatomite, 1-3 parts of silicon carbide and 4-7 parts of titanium dioxide;
the modified ultrahigh molecular weight polyethylene is prepared by the following method: mixing 2-4 parts of graphene, 1-3 parts of flake graphite and 3-5 parts of talcum powder, adding 5-8 parts of ultrahigh molecular weight polyethylene, heating and stirring, heating to 80-100 ℃, stirring at the rotating speed of 2000-3000r/min for 3-6h, adding 2-5 parts of dicyclopentadiene resin, uniformly mixing, extruding and granulating.
2. The self-lubricating high-density polyethylene pipe for coal mines as claimed in claim 1, wherein the lubricant is prepared by the following method: heating polyethylene wax to 104-130 ℃ for melting, sequentially adding silicone oil, boron nitride, sodium hyaluronate and ethyl cellulose, mixing and stirring uniformly, and cooling to obtain the lubricant.
3. The self-lubricating high-density polyethylene pipe for coal mines as claimed in claim 1, wherein the molecular weight of the ultra-high molecular weight polyethylene is 350-500 ten thousand, and the melt index of the high-density polyethylene is 0.2-10g/10 min.
4. The self-lubricating high-density polyethylene pipe for coal mines as claimed in claim 1, wherein the particle size of the corrosion resistance modifier is 0.2 to 0.5 μm.
5. The self-lubricating high-density polyethylene pipe for coal mines as claimed in claim 1, wherein the flame retardant is one or a combination of red phosphorus, antimony trioxide and calcium bentonite.
6. The self-lubricating high-density polyethylene pipe for coal mines as claimed in claim 1, wherein the coupling agent is one of titanate coupling agent NDZ-201, aluminate coupling agent DL-411 and silane coupling agent KH-570.
7. The self-lubricating high-density polyethylene pipe for coal mines as claimed in claim 1, wherein the reinforcing filler is a mixture of polyimide, polytrimethylene terephthalate and polyethylene terephthalate in a mass ratio of 1 (0.8-10) to (0.8-1).
8. A method for preparing the self-lubricating high-density polyethylene pipe for coal mines according to any one of claims 1 to 7, which comprises the following steps:
s1, mixing the high-density polyethylene, the lubricant and the corrosion-resistant modifier, and then performing blending granulation in a double-screw extruder, wherein the temperature of each section of the double-screw extruder is 200-250 ℃, and the rotating speed of a screw is 20-35r/min, so as to obtain a pretreatment material;
s2, mixing the pretreatment material with modified ultrahigh molecular weight polyethylene, polyethylene fiber and hollow glass beads at the temperature of 150 ℃ and 280 ℃ for 2-3h to prepare a semi-mixed material;
s3, adding the semi-mixed material, the reinforcing filler, the flame retardant and the coupling agent into a high-speed mixer, mixing at the rotation speed of 1500-1800r/min for 3-6min to obtain a mixed material, adding the mixed material into an extruder, extruding and molding, setting the rotation speed of a screw of the extruder at 20-60r/min and the traction speed at 0.5-10m/min, extruding, cooling and shaping by the extruder to obtain a finished product.
9. The method for preparing the self-lubricating high-density polyethylene pipe for coal mines according to claim 8, wherein the temperature of the five zones of the extruder in the step S3 is as follows: 165-175 deg.C, 175-185 deg.C, 190-200 deg.C, 215-225 deg.C, 220-230 deg.C.
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