Wear-resistant material, preparation method and application thereof and slurry pipeline
阅读说明：本技术 耐磨材料及其制备方法和应用和浆液管道 (Wear-resistant material, preparation method and application thereof and slurry pipeline ) 是由 王曙光 马伊 张春波 张寅灵 刘国刚 于芳 梁文斌 于 2019-03-15 设计创作，主要内容包括：本发明涉及耐磨管道领域,公开了一种耐磨材料及其制备方法和应用和浆液管道。所述耐磨材料包含共混以下组分：组分A和加工助剂；其中,所述组分A包含聚硅氧烷改性的超高分子量聚乙烯、共聚聚丙烯和无机填料,所述加工助剂包含偶联剂、润滑剂和抗氧剂；所述共聚聚丙烯在230℃、2.16kg的熔融指数≤1g/10min；所述偶联剂选自硅烷偶联剂和/或钛酸酯偶联剂。本发明的耐磨材料在湿磨工况具有较高的耐磨损性能,因此特别适合作为浆液管道的耐磨层使用。(The invention relates to the field of wear-resistant pipelines and discloses a wear-resistant material, a preparation method and application thereof and a slurry pipeline. The wear resistant material comprises blending the following components: component A and a processing aid; the component A comprises polysiloxane modified ultrahigh molecular weight polyethylene, polypropylene copolymer and an inorganic filler, and the processing aid comprises a coupling agent, a lubricant and an antioxidant; the melt index of the copolymerized polypropylene at 230 ℃ and 2.16kg is less than or equal to 1g/10 min; the coupling agent is selected from silane coupling agent and/or titanate coupling agent. The wear-resistant material has higher wear resistance under the wet grinding condition, so the wear-resistant material is particularly suitable for being used as a wear-resistant layer of a slurry pipeline.)
1. An abrasion resistant material comprising blending: component A and a processing aid; the component A comprises polysiloxane modified ultrahigh molecular weight polyethylene, polypropylene copolymer and an inorganic filler, and the processing aid comprises a coupling agent, a lubricant and an antioxidant;
the melt index of the copolymerized polypropylene at 230 ℃ and 2.16kg is less than or equal to 1g/10 min;
the coupling agent is selected from silane coupling agent and/or titanate coupling agent;
based on the total weight of the component A, the content of the siloxane modified ultra-high molecular weight polyethylene is 60-85 wt%, the content of the copolymerized polypropylene is 5-30 wt%, and the content of the inorganic filler is 1-27 wt%;
the content of the processing aid is 1 to 10 parts by weight with respect to 100 parts by weight of component A.
2. The wear resistant material of claim 1 wherein the siloxane modified ultra high molecular weight polyethylene is present in an amount of 67 to 80 weight percent, the co-polypropylene is present in an amount of 5 to 15 weight percent, and the inorganic filler is present in an amount of 15 to 25 weight percent, based on the total weight of component a.
3. The wear resistant material of claim 1 wherein the inorganic filler is selected from diamond, rutile TiO2At least one of glass fiber, glass bead, wollastonite, limestone, calcium sulfate whisker, aluminum borate whisker, potassium titanate whisker and calcium carbonate whisker, preferably calcium sulfate whisker and/or aluminum borate whisker.
4. The wear resistant material according to claim 1, wherein the coupling agent is contained in an amount of 0.1 to 0.3 parts by weight, the lubricant is contained in an amount of 1 to 5 parts by weight, and the antioxidant is contained in an amount of 0.1 to 0.5 parts by weight, relative to 100 parts by weight of the component a.
5. The wear resistant material of claim 1 or 4 wherein the antioxidant is selected from phenolic antioxidants and/or phosphite antioxidants;
preferably, the phenolic antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and/or n-octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate;
preferably, the phosphite antioxidant is bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite and/or tris (2, 4-di-tert-butylphenyl) phosphite.
6. The wear resistant material of claim 1 or 4 wherein the lubricant is selected from polytetrafluoroethylene and/or polyvinylidene fluoride.
7. A method of making the wear resistant material of any one of claims 1-6, the method comprising:
1) carrying out first blending on the inorganic filler and a coupling agent, so that the coupling agent is coated on the surface of the inorganic filler to form a first blend;
2) secondly blending the first blend with the polysiloxane modified ultrahigh molecular weight polyethylene, the polypropylene copolymer, the lubricant and the antioxidant to form a second blend;
3) the second blend was melt extruded and pelletized.
8. The process according to claim 7, wherein in step 1), the temperature of the first blending is 90-100 ℃ and the blending time is 2-10 minutes; and/or
In the step 2), the second blending temperature is 80-90 ℃, and the blending time is 1-5 minutes.
9. Use of the wear resistant material of any one of claims 1-6 in slurry piping.
10. A slurry pipeline, which comprises an integrally formed hollow pipeline, wherein the hollow pipeline has a double-layer structure and is composed of a wear-resistant layer as an inner layer and a bearing layer as an outer layer, wherein the wear-resistant layer is made of the wear-resistant material of any one of claims 1 to 6, the bearing layer is made of polyolefin resin, the flexural modulus of the polyolefin resin is more than or equal to 1.2GPa, and the notch impact strength is more than or equal to 30KJ/m2。
Technical Field
The invention relates to the field of wear-resistant pipelines, in particular to a wear-resistant material, a preparation method and application thereof and a slurry pipeline.
Background
For materials such as pneumatic and pumping slurry with the characteristics of high hardness, high flow speed, large flow and the like, common pipelines can not bear and are damaged in the transportation process. It is therefore now proposed to use wear resistant pipes for transporting the slurry. Wear-resistant pipe conveying is spread in the fields of electric power, metallurgy, coal, petroleum, chemical industry, building materials, machinery and the like.
CN101845195A discloses a wear-resistant thermoplastic elastomer and a preparation method thereof, wherein the elastomer is prepared by blending 10-80% of matrix resin, 10-60% of master batch, 0-42% of filling oil, 0-20% of thermoplastic resin, 0-30% of mineral filler, 0-1.5% of coupling agent, 0.1-2% of processing aid and 0.1-2% of stabilizer. The thermoplastic elastomer material needs a large amount of oil charge in the preparation process, and has poor wear resistance under the wet grinding working condition of slurry delivery.
CN102838866A discloses a polyurethane and polypropylene nano modified material, which is prepared by blending 100 parts of polyurethane, 35-70 parts of polypropylene, 15-25 parts of plasticizer, 5-8 parts of functional modifier, 0.5-2 parts of nano material, 6-9 parts of calcium-zinc stabilizer and 0.5-1.5 parts of lubricant. The polyurethane and polypropylene nano modified material has low ductility, is suitable for the field of machinery, and has poor performance under the wet grinding working condition.
CN103275402A discloses a wear-resistant thermoplastic elastomer and a preparation method thereof, which is characterized in that the wear-resistant thermoplastic elastomer is prepared by blending and processing 70-95 parts by weight of thermoplastic dynamic vulcanized rubber, 5-30 parts by weight of wear-resistant agent, 0.2-1 part by weight of antioxidant and 1-2 parts by weight of processing aid by twin screws. The dynamic vulcanized rubber of PP/EPDM adopted in the grinding thermoplastic elastomer has certain ductility and wear resistance, but the wear resistance of EPDM is still low.
CN104448505A discloses a polyethylene microcrystalline ceramic composite material and a preparation method thereof, which is characterized in that a PE matrix system and a microcrystalline ceramic system are blended by 70-80/30-20 to prepare the polyethylene microcrystalline ceramic composite material, wherein the polyethylene matrix system is as follows: 100 parts of high-density polyethylene, 1-5 parts of silicone powder, 5-10 parts of elastomer graft toughening modifier and 10100.5-1 part of antioxidant; the microcrystalline ceramic system is as follows: 30-56 parts of silicate microcrystalline ceramic, 60-66 parts of zinc oxide, 2-3 parts of montmorillonite and 2-3 parts of titanate coupling agent. However, due to poor ductility of the matrix resin, the abrasive properties of the material are reduced by the falling off of the particles as the slurry impacts.
Therefore, the prior art can not effectively solve the problem of abrasion of the pipeline in the slurry conveying process.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a novel wear-resistant material, a preparation method and application thereof and a slurry pipeline.
According to a first aspect of the present invention, there is provided an abrasion resistant material comprising blending: component A and a processing aid; the component A comprises polysiloxane modified ultrahigh molecular weight polyethylene, polypropylene copolymer and an inorganic filler, and the processing aid comprises a coupling agent, a lubricant and an antioxidant; the melt index of the copolymerized polypropylene at 230 ℃ and 2.16kg is less than or equal to 1g/10 min; the coupling agent is selected from silane coupling agent and/or titanate coupling agent; based on the total weight of the component A, the content of the siloxane modified ultra-high molecular weight polyethylene is 60-85 wt%, the content of the copolymerized polypropylene is 5-30 wt%, and the content of the inorganic filler is 1-27 wt%; the content of the processing aid is 1 to 10 parts by weight with respect to 100 parts by weight of component A.
According to a second aspect of the invention, there is provided a method of making a wear resistant material according to the first aspect of the invention, the method comprising:
1) carrying out first blending on the inorganic filler and a coupling agent to ensure that the coupling agent is coated on the surface of the inorganic filler to form a first blend;
2) secondly blending the first blend with the polysiloxane modified ultrahigh molecular weight polyethylene, the polypropylene copolymer, the lubricant and the antioxidant to form a second blend;
3) the second blend was melt extruded and pelletized.
According to a third aspect of the invention, the invention provides the use of the abrasive wear-resistant material in a slurry pipe.
According to the inventionIn a fourth aspect, the invention provides a slurry pipeline, which comprises an integrally formed hollow pipeline, wherein the hollow pipeline has a double-layer structure and is composed of a wear-resistant layer as an inner layer and a bearing layer as an outer layer, the wear-resistant layer is made of the wear-resistant material of the first aspect of the invention, the bearing layer is made of polyolefin resin, the flexural modulus of the polyolefin resin is more than or equal to 1.2GPa, and the notch impact strength is more than or equal to 30KJ/m2。
The wear-resistant material has higher wear resistance under the wet grinding condition, so the wear-resistant material is particularly suitable for being used as a wear-resistant layer of a slurry pipeline, the wear-resistant material has excellent processing performance and good compatibility with a pressure bearing layer material of the pipeline, the two materials can be formed at one time by an extruder, the problem of interface stripping is avoided, and the long-term utilization of the slurry pipeline can be realized.
Drawings
FIG. 1 is a schematic diagram of the structure of a slurry pipe according to an embodiment of the present invention.
Description of the reference numerals
1: a wear layer; 2: and a pressure bearing layer.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
According to a first aspect of the present invention, there is provided an abrasion resistant material comprising the following components in blend: component A and a processing aid.
In the wear-resistant material, the component A comprises polysiloxane modified ultrahigh molecular weight polyethylene, polypropylene copolymer and inorganic filler; based on the total weight of the component A, the content of the polysiloxane modified ultrahigh molecular weight polyethylene is 60-85 wt%, the content of the polypropylene copolymer is 5-30 wt%, and the content of the inorganic filler is 1-27 wt%.
In the wear-resistant material, the processing aid comprises a coupling agent, a lubricant and an antioxidant. The content of the processing aid is 1 to 10 parts by weight, preferably 2 to 7 parts by weight, relative to 100 parts by weight of the component a.
In the wear-resistant material, the polysiloxane modified ultra-high molecular weight polyethylene belongs to a thermoplastic elastomer and is composed of a polysiloxane chain segment and an ultra-high molecular weight polyethylene chain segment, wherein the polysiloxane chain segment provides excellent ductility for the wear-resistant material, and the ultra-high molecular weight polyethylene chain segment provides a low surface friction coefficient for the wear-resistant material. The polysiloxane-modified ultrahigh molecular weight polyethylene can be prepared according to methods well known in the art, for example, according to the preparation method for "modified polyolefin pipe material" in CN103013022B, or can be obtained commercially, for example, from seixxin new materials ltd under the designation GXCG-1101.
In the wear-resistant material, the melt index of the co-polypropylene at 230 ℃ and 2.16kg is less than or equal to 1g/10 min. The copolymerized polypropylene may be various products commercially available as long as the above melt index requirements are satisfied.
In the wear-resistant material, the inorganic filler can further improve the hardness and wear resistance of the wear-resistant material. In particular, the inorganic filler may be selected from diamond, rutile TiO2At least one of glass fiber, glass bead, wollastonite, limestone (e.g., ground calcium carbonate), calcium sulfate whisker, aluminum borate whisker, potassium titanate whisker and calcium carbonate whisker. Preferably, the inorganic filler is calcium sulfate whisker and/or aluminum borate whisker, so that the abrasion resistance of the wear-resistant material and the bonding strength with the pressure bearing layer of the slurry pipeline can be further improved. Preferably, the diameter of the calcium sulfate whisker is less than or equal to 5 mu m, and the length-diameter ratio of the calcium sulfate whisker is less than or equal to 80.
In the wear-resistant material of the present invention, preferably, the content of the siloxane-modified ultrahigh molecular weight polyethylene copolymer is 67 to 80 wt%, the content of the copolymerized polypropylene is 5 to 30 wt%, and the content of the inorganic filler is 15 to 25 wt%, based on the total weight of the component a.
In the wear-resistant material, the lubricant is selected from polytetrafluoroethylene and/or polyvinylidene fluoride, and the lubricant can reduce the friction coefficient of the surface of the wear-resistant material, so that the surface of a slurry pipeline formed by the wear-resistant material has higher wear resistance. Preferably, the lubricant has a particle size < 40 μm.
Preferably, the lubricant is contained in an amount of 1 to 5 parts by weight with respect to 100 parts by weight of component a.
In the wear resistant material of the present invention, the antioxidant may be selected with reference to the prior art. Typically, the antioxidant comprises a phenolic antioxidant and/or a phosphite antioxidant. Preferably, the antioxidant is a combination of a phenolic antioxidant and a phosphite antioxidant, wherein the mass ratio of the phenolic antioxidant to the phosphite antioxidant can be 1-2: 1.
Preferably, the phenolic antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and/or n-octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate.
Preferably, the phosphite antioxidant is bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite and/or tris (2, 4-di-tert-butylphenyl) phosphite.
Preferably, the antioxidant is contained in an amount of 0.1 to 0.5 parts by weight, relative to 100 parts by weight of the component A.
In the wear-resistant material, the coupling agent is a silane coupling agent and/or a titanate coupling agent. The silane coupling agent may be, for example, one or more selected from the group consisting of gamma-aminopropyltriethoxysilane (KH-550), 3- (methacryloyloxy) propyltrimethoxysilane, vinyltris (2-methoxyethoxy) silane, and 3-glycidoxypropyltrimethoxysilane. The titanate coupling agent may be selected, for example, from one or more of isopropyl trioleate acyloxy titanate (HY-105), isopropyl tris (isostearoyl) titanate, isopropyl triisooctanoyl titanate, isopropyl dioleoyl diisooctanoyl phosphate acyloxy vonate, and ethylene dioleoyl titanate.
Preferably, the coupling agent is contained in an amount of 0.1 to 0.3 parts by weight, relative to 100 parts by weight of the component A.
According to one embodiment, the wear resistant material may be made by blending, melt extruding and pelletizing the components therein. In order to achieve a more homogeneous dispersion of the inorganic filler in the polymer, it is preferred that the process of blending is carried out in two stages, for which reason the second aspect of the invention provides a preferred process for preparing the abrasion resistant material.
According to a second aspect of the present invention, there is provided a method of preparing the wear resistant material, the method comprising:
1) carrying out first blending on the inorganic filler and a coupling agent to ensure that the coupling agent is coated on the surface of the inorganic filler to form a first blend;
2) secondly blending the first blend with the polysiloxane modified ultra-high molecular weight polyethylene copolymer, the polypropylene copolymer, the lubricant and the antioxidant to form a second blend;
3) and performing melt extrusion granulation on the second blend.
According to the method of the present invention, the first blending and the second blending can be performed in a high-speed blender, and the blending conditions are not particularly limited as long as the components can be uniformly mixed. However, in order to improve the blending efficiency, it is preferable that the temperature of the first blending is 90 to 100 ℃ and the blending time is 2 to 10 minutes, more preferably 3 to 5 minutes. Preferably, the second blending temperature is 80-90 ℃ and the blending time is 1-5 minutes, more preferably 2-4 minutes.
According to the method of the present invention, in step 3), the melt extrusion granulation may be performed by a twin-screw extruder, and the length-to-diameter ratio of the twin-screw may be 36 to 48. The conditions for melt extrusion granulation may include: the extrusion temperature is 180-230 ℃.
According to a third aspect of the invention, the invention provides the use of the abrasive wear-resistant material in a slurry pipe. The wear-resistant material has high wear resistance and excellent processing performance, the material and polyolefin resin serving as a material of a pipeline bearing layer can be integrally extruded and molded through an extruder without falling off, and the two functional layers are connected and fastened, so that a slurry pipeline has higher durability under the transportation condition.
According to a fourth aspect of the present invention, there is provided a slurry pipe, as shown in fig. 1, comprising an integrally formed hollow pipe having a double-layered structure composed of a wear-
According to the slurry pipe of the invention, the material of the wear-
The slurry pipe can be prepared by the following method: and co-extruding the wear-resistant material serving as the core layer and the polyolefin resin serving as the skin layer by a double-screw extruder. Wherein the processing conditions of the wear-resistant material may include: the temperature of the double screw is 170-170 ℃, the temperature of the die orifice is 150-170 ℃, the rotating speed of the double screw is 300-600 r/min, and the processing conditions of the polyolefin resin comprise: the temperature of the double screw is 200-.
The slurry pipe has high abrasion resistance, simple processing technology, low cost and high durability under transportation conditions. The slurry pipeline can be applied to low-granularity solid-liquid conveying working conditions such as power plant desulfurization slurry pipelines, river dredging pipelines and the like.
The present invention will be described in detail below by way of examples.
The following examples 1-7 are provided to illustrate the wear resistant materials of the present invention and methods of making the same. Wherein the content of the first and second substances,
polysiloxane-modified ultra-high molecular weight polyethylene is purchased from Sichuan Xin New Material Co., Ltd, and the mark is GXCG-1101;
the polypropylene copolymer is purchased from China petrochemical Yanshan petrochemical company, the mark is 4220, and the melt index (230 ℃, 2.16kg) is 0.45g/10 min;
the silane coupling agent is purchased from Hubei Huaxin organic silicon new material Co., Ltd, and the mark is KH-550;
the titanate coupling agent is purchased from Hangzhou Jesseca chemical Co., Ltd, and the mark is HY-105;
polytetrafluoroethylene was purchased from Clarmaier reagent, having an average particle size of 5 μm;
the calcium sulfate whisker is purchased from Shanghai Poncirus pelagina composite new material technology company Limited, and has the brand number of NP-M02, the diameter of 1-4 mu M and the length-diameter ratio of 40-80;
the high-speed blending machine is purchased from Zhang family, Port, Grey scientific and technological development Co., Ltd, and has the model of SHR-200B;
a26-type double-screw extruder is purchased from Nanjing Ruia extruder manufacturing machinery, Inc., and has the model of AK-26;
a type 45 compound line extruder was purchased from the Vast plastic machinery Inc. of Qingdao, model SJQG-Z90X 30-160.