Highly abrasion resistant polyethylene composite particles, materials and applications thereof

Abstract

The application discloses a kind of high wear-resistant polyethylene composite particles and material and application thereof.The polyethylene composite particles are in-situ blend of synthetic mineral wax and ultra-high molecular weight polyethylene, particle size is 50-500 μm, in the particle, ultra-high molecular weight polyethylene and synthetic mineral wax exist alternately, and ultra-high molecular weight polyethylene presents nanosheet structure.Initial elastic modulus of polyethylene composite particles under the condition of 160 DEG C is 0.05-0.5 MPa, after 30 min rheological sweep test, linear correlation coefficient R 2 ≥0.99 of loss modulus G'' and elastic modulus G' curve, and loss modulus G'' is distributed in 10 3 ‑10 7 Pa, elastic modulus G' is distributed in 10 2 ‑10 7 Pa.Taber abrasion index of polyethylene composite material after forming processing is 0.2-50 mg / 1000r, tensile breaking strength is 50-120 MPa, and cantilever beam impact strength is 50-200 kJ / m 2 The polyethylene composite particles of the application have the advantages of easy processing, low friction coefficient and abrasion, stable friction coefficient and abrasion, excellent self-lubricating performance, chemical corrosion resistance, low water absorption and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high molecular polymer materials, in particular, the present application relates to a kind of high wear-resistant polyethylene composite particles and material and application. BACKGROUND

[0002] Ultra-high molecular weight polyethylene (UHMWPE) has the advantages of small friction coefficient, low wear, excellent chemical resistance, impact resistance, pressure resistance, frost resistance, thermal insulation, self-lubricating, anti-fouling, stress cracking resistance, and renewability. Among them, the wear resistance, low temperature resistance, corrosion resistance, self-lubricating, and impact resistance are the best among all plastics. When UHMWPE products are mass-produced, the viscosity is extremely high due to the excessive number of entanglement points within and between molecular chains, so flow modifiers need to be added to improve the melt flow properties and increase production efficiency. However, the addition of flow modifiers can severely damage the mechanical properties of UHMWPE, and the wear resistance performance can be greatly reduced. Invention patent CN202011575362.5 discloses a high-impact, high-biofouling, and high-wear-resistant marine plastic pipe and its preparation method. The marine plastic pipe comprises the following raw materials: ultra-high molecular weight polyethylene (UHMWPE), composite flow modifier, fluorine-containing resin; antioxidant, halogen-free flame retardant; the composite flow modifier includes polypropylene (PP), low molecular weight linear polysilane (PMPS), polyethylene glycol (PEG), polylactic acid (PLA), and stearate. After mixing the above formula, a double-screw extruder is used for granulation, then the granules are added to a single-screw extruder for extrusion molding, cooling, setting, and cutting to obtain a marine plastic pipe. As can be seen, in the process of UHMWPE molding, in addition to the addition of flow modifiers, wear-resistant component materials are often added. For example, invention patent CN201910969429.4 discloses a preparation of UHMWPE / PP / SiC composite material, UHMWPE 85 parts, SiC 1-4 parts, and PP 15 parts are respectively dried in a drying box, then the treated products are placed in a high-speed kneader with a compound antioxidant and SiC coupling agent for high-speed mixing, extruded and granulated by a double-screw extruder, and molded to obtain a UHMWPE / PP / SiC composite material. This invention simultaneously uses PP and SiC nanoparticles to modify UHMWPE, improving the flowability and processability of UHMWPE, and simultaneously imparting excellent wear resistance and scratch resistance to UHMWPE.

[0003] Therefore, how to improve the flowability of UHMWPE products while not adding or adding less nanoparticle filling modification materials, and then improve or maintain the wear resistance of UHMWPE products is a prominent problem. SUMMARY

[0004] To solve the above technical problems, the present application aims to provide a kind of high wear-resistant polyethylene composite particles and its material and application, can improve the production efficiency of existing ultra-high molecular weight polyethylene product, solve the problem that easy processing and wear resistance are difficult to be enhanced simultaneously.

[0005] According to one object of the present application, the present application provides a kind of high wear-resistant polyethylene composite particles, the polyethylene composite particles are in-situ blend of synthetic mineral wax and ultra-high molecular weight polyethylene, wherein the mass ratio of synthetic mineral wax and ultra-high molecular weight polyethylene is 1: (1-200), the particle size of polyethylene composite material particle is 50-500 μm, in polyethylene composite material particle, ultra-high molecular weight polyethylene presents nanosheet structure, and the spacing between adjacent ultra-high molecular weight polyethylene nanosheet is 50-10000 nm;The initial elastic modulus of polyethylene composite particle is 0.05-0.5 MPa under the condition of 160 DEG C, after 30 min rheological sweep test, the linear correlation coefficient R 2 ≥0.99 of loss modulus G" and elastic modulus G' curve, and loss modulus G" is distributed in 10 3 -10 7 Pa, elastic modulus G' is distributed in 10 2 -10 7 Pa.

[0006] According to the preferred embodiment of the present application, the polyethylene composite particle is prepared by the following method:

[0007] a) first reaction kettle high-purity nitrogen replacement not less than 5 times, in the first reaction kettle, synthetic mineral wax is dissolved in alkane solvent with a concentration of 1-50wt%, and the dissolution temperature is 50-100 DEG C;After the temperature of the first reaction kettle reaches the set temperature, the comonomer, the cocatalyst and the catalyst are added in turn, and the synthetic mineral wax accounts for 0.5-15wt% of the total mass of the liquid phase in the first reaction kettle before the polymerization reaction occurs;Ethylene is introduced to the set pressure, and the polymerization temperature is 90-100 DEG C, and after a certain time t1, it is transferred to the second reaction kettle;Wherein, t1 is 1-30 min;

[0008] b) the polymerization temperature in the second reaction kettle is 50-90 DEG C, and after a certain time t2, the reaction is ended, and after drying, polyethylene composite material particle is obtained. Wherein, t2 is 1-300 min.

[0009] According to the preferred embodiment of the present application, the synthetic mineral wax is selected from one or more of polyethylene wax, polypropylene wax, polyamide wax, Fischer-Tropsch wax, paraffin wax, oxidized polyethylene wax, oxidized polypropylene wax;The weight average molecular weight of synthetic mineral wax is 400-10000 g / mol, and the molecular weight distribution index is 2-10.

[0010] According to a preferred embodiment of the present invention, the alkane solvent is selected from one or more of n-butane, isobutane, n-pentane, isopentane, n-hexane, 2-methylpentane, 3-methylpentane, n-heptane, 2-methylhexane, 3-methylhexane, n-octane, 2-methylheptane, 3-methylheptane, n-nonane, and n-decane; the co-catalyst is selected from one or more of methylaluminoxane, modified methylaluminoxane, ethylaluminoxane, butylaluminoxane, trimethylaluminum, triethylaluminum, triisobutylaluminum, trihexylaluminum, trioctylaluminum, diethylaluminum chloride, diethylaluminum chloride, triphenylborane, tri(4-fluorophenyl)borane, tri(pentafluorophenyl)borane, tri(3,5-difluorophenyl)borane, and tri(2,4,6-trifluorophenyl)borane; and the catalyst is selected from one or more of metallocene catalysts, post-transition metal catalysts, Ziegler-Natta catalysts, non-metallocene catalysts, and FI catalysts.

[0011] According to a preferred embodiment of the present invention, the weight-average molecular weight of the ultra-high molecular weight polyethylene component is 700,000-7,000,000 g / mol, and the molecular weight distribution index is 2-10.

[0012] According to a preferred embodiment of the present invention, the molecular weight distribution index of the highly wear-resistant polyethylene composite particles is between 30 and 500.

[0013] According to a preferred embodiment of the present invention, after wax washing treatment, the polyethylene composite particles have an average particle size of 50-250 μm, a pore size distribution of 0.1-5 μm, and a specific surface area of ​​300-1000 m². 2 / g, pore volume 0.2-0.6cm 3 / g.

[0014] According to a preferred embodiment of the present invention, the Shore hardness of the polyethylene composite particles is 50-100.

[0015] According to a second objective of the present invention, the present invention provides a high-wear-resistant polyethylene composite material obtained by processing the aforementioned particles, which is obtained by molding the aforementioned polyethylene composite particles; the molding process is sintering, hot pressing, extrusion molding, rotational molding, or injection molding; the polyethylene composite material obtained by molding has a Tybean abrasion index of 0.2-50 mg / 1000 r, a tensile breaking strength of 30-120 MPa, and a cantilever beam impact strength of 50-200 kJ / m. 2 .

[0016] According to a preferred embodiment of the present invention, the Tyber abrasion index of the polyethylene composite material after molding and processing is preferably 0.5-20 mg / 1000 r, the tensile breaking strength is preferably 45-110 MPa, and the cantilever beam impact strength is preferably 90-180 kJ / m. 2The initial elastic modulus is preferably 0.1-0.4 MPa.

[0017] According to a preferred embodiment of the present invention, the difference in the Talbot abrasion index between the surface layer and the inner layer of the high-wear-resistant polyethylene composite material is no higher than 5 mg / 1000 r, the coefficient of friction of the polyethylene composite material is 0.08-0.3, and the difference in the coefficient of friction between the surface layer and the inner layer is no higher than 0.02. The inner layer referred to in this invention refers to the internal region or internal location of the polyethylene composite material excluding the surface layer, including both the internal region near the surface layer and the central region near the center of the material. The thickness of the surface layer generally does not exceed 1 / 3 of the thickness from the surface of the composite material to the central region.

[0018] According to a third objective of the present invention, the present invention provides the application of the above-mentioned high wear-resistant polyethylene composite particles in the reinforcement and toughening of polyolefin materials, the preparation of highway and railway bridge bearings, the preparation of wear-resistant liners, the preparation of mechanical parts, the preparation of gas adsorption materials, or the preparation of asphalt anti-rutting agents. The polyethylene composite particles of the present invention have advantages such as easy processing, low coefficient of friction and wear, stable coefficient of friction and wear, excellent self-lubricating properties, resistance to chemical corrosion, and low water absorption.

[0019] The present invention has the following outstanding benefits: (1) In the polyethylene composite particles of the present invention, the synthetic mineral wax can be fully and uniformly dispersed between the ultra-high molecular weight polyethylene. Specifically, the ultra-high molecular weight polyethylene presents a nanosheet structure, and the synthetic mineral wax fills between the nanosheets during the polymerization process. On the one hand, the ultra-high molecular weight polyethylene nanosheets are low-entanglement ultra-high molecular weight polyethylene with high crystallinity, high hardness and wear resistance, which can improve the wear resistance of the composite particles. On the other hand, the synthetic mineral wax filling between the ultra-high molecular weight polyethylene nanosheets can more quickly lubricate the ultra-high molecular weight polyethylene molecular chains during the sintering and molding process of the composite particles, that is, promote the opening of the ultra-high molecular weight polyethylene molecular chains, which can effectively improve the processing performance of the composite material.

[0020] (2) Synthetic mineral wax itself has the effect of reducing the coefficient of friction, and plays a good self-lubricating effect in the friction process of composite particles or composite materials, which further improves wear resistance.

[0021] (3) Thanks to the rapid movement capability of the low entanglement ultra-high molecular weight polyethylene molecular chains, the interaction force between synthetic mineral wax and ultra-high molecular weight polyethylene and between different ultra-high molecular weight polyethylene molecular chains in the composite particle sintering molded products is strong, which is conducive to stress transfer during processing and molding, avoids the reduction of mechanical properties, and can also form physical cross-linking points more quickly during the molding process, making the molded products more wear-resistant.

[0022] (4) By adjusting the mass ratio of in-situ polymerized synthetic mineral wax to ultra-high molecular weight polyethylene, the processability and wear resistance of composite particles or composite materials can be controlled. Attached Figure Description

[0023] Figure 1 This is a scanning electron microscope image of the surface of polyethylene composite particles.

[0024] Figure 2 This is the elastic modulus G'-time t curve of polyethylene composite particles at 160℃.

[0025] Figure 3 The curves show the loss modulus G” and elastic modulus G’ of polyethylene composite particles under rheological sweep frequency test at 160℃. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0027] The following methods are used to test the structure or properties of the polyethylene composite materials produced in the examples described:

[0028] High-temperature gel permeation chromatography (GPC) is used to test the molecular weight and distribution index of synthetic mineral wax and polyethylene composite particles.

[0029] Synthetic mineral wax in polyethylene composite particles was separated by heating and rinsing with n-heptane, thereby determining the mass ratio of synthetic mineral wax to ultra-high molecular weight polyethylene.

[0030] The universal testing machine is used to test the tensile strength and elongation at break of polyethylene composite materials.

[0031] Impact testing machines are used to test the impact strength of polyethylene composite materials.

[0032] A hardness tester is used to test the hardness of polyethylene composite particles.

[0033] A friction coefficient meter is used to test the friction coefficient of polyethylene composite materials.

[0034] The Taber abrasion tester is used to test the Taber abrasion index of polyethylene composites.

[0035] Rotational rheometers are used to test the initial elastic modulus and rheological sweep frequency of polyethylene composite particles.

[0036] The specific surface area analyzer is used to test the specific surface area, pore size, and pore volume of polyethylene composite particles.

[0037] Example 1

[0038] Polyethylene wax (weight average molecular weight 1200 g / mol, molecular weight distribution 6.3) was dissolved in n-hexane at 80 °C at a concentration of 3.5 wt%. 400 mL of the n-hexane solution containing polyethylene wax was injected into a pre-dehydrated and deoxygenated first reactor. The polymerization temperature in the first reactor was set to 98 °C. 10 mL of 1-hexene, 200 μmol of triethylaluminum, and 2 μmol of supported Ziegler-Natta catalyst were added. Ethylene was introduced to 10 bar. After polymerization for 20 min, the mixture was transferred to a second reactor. The polymerization temperature was 78 °C, and the reaction was terminated after 120 min. The product was then discharged and dried to obtain polyethylene composite particles 1. The characterization results of polyethylene composite particles 1 are shown in Table 1.

[0039] Polyethylene composite particles 1 were sintered at 100 bar pressure and 230°C for 30 min to obtain high-wear-resistant polyethylene composite material A. The performance test results of polyethylene composite material A are shown in Table 2.

[0040] Example 2

[0041] Oxidized polyethylene wax (weight average molecular weight 1800 g / mol, molecular weight distribution 5.3) was dissolved at a concentration of 2.5 wt% in n-heptane at 85 °C. 400 mL of the n-heptane solution containing the oxidized polyethylene wax was injected into a pre-dehydrated and deoxygenated first reactor. The polymerization temperature in the first reactor was set to 91 °C. 200 μmol of triethylaluminum and 2 μmol of supported Ziegler-Natta catalyst were added, and ethylene was introduced to 12 bar. After polymerization for 30 min, the mixture was transferred to a second reactor at 84 °C. After polymerization for 200 min, the reaction was terminated, and the material was discharged and dried to obtain polyethylene composite particles 2. The characterization results of polyethylene composite particles 2 are shown in Table 1.

[0042] Polyethylene composite particles 2 were sintered at 120 bar pressure and 220°C for 60 min to obtain high-wear-resistant polyethylene composite material B. The performance test results of polyethylene composite material B are shown in Table 2.

[0043] Example 3

[0044] Fischer-Tropsch wax (weight-average molecular weight 600 g / mol, molecular weight distribution 3.3) was dissolved at a concentration of 10 wt% in n-pentane at 80 °C. 400 mL of the n-pentane solution containing Fischer-Tropsch wax was injected into a pre-dehydrated and deoxygenated first reactor. The polymerization temperature in the first reactor was set to 95 °C. 400 μmol of methylaluminoxane and 2 μmol of supported metallocene catalyst were added, and ethylene was introduced to 15 bar. After polymerization for 5 min, the mixture was transferred to a second reactor at 80 °C. The polymerization was completed after 270 min, and the mixture was discharged and dried to obtain polyethylene composite particles 3. The characterization results of polyethylene composite particles 3 are shown in Table 1.

[0045] Polyethylene composite particles 3 were sintered at 160 bar pressure and 220°C for 50 min to obtain high-wear-resistant polyethylene composite material C. The performance test results of polyethylene composite material C are shown in Table 2.

[0046] Example 4

[0047] Polyethylene wax (weight average molecular weight 5200 g / mol, molecular weight distribution 3.1) was dissolved at a concentration of 1.5 wt% in n-heptane at 85 °C. 400 mL of the n-heptane solution containing polyethylene wax was injected into a pre-dehydrated and deoxygenated first reactor. The polymerization temperature in the first reactor was set to 94 °C. 500 μmol of modified methylaluminoxane and 2 μmol of supported metallocene catalyst were added, and ethylene was introduced to 16 bar. After polymerization for 4 min, the mixture was transferred to a second reactor at 73 °C. After polymerization for 60 min, the reaction was terminated, and the material was discharged and dried to obtain polyethylene composite particles 4. The characterization results of polyethylene composite particles 4 are shown in Table 1.

[0048] Polyethylene composite particles 4 were sintered at 150 bar pressure and 240°C for 50 min to obtain high-wear-resistant polyethylene composite material D. The performance test results of polyethylene composite material D are shown in Table 2.

[0049] Comparative Example 1

[0050] 100 parts by weight of commercially available ultra-high molecular weight polyethylene (Shanghai Lianle, SLL350, weight average molecular weight 2460 kg / mol, molecular weight distribution 5.5) and 10 parts by weight of commercially available polyethylene wax (weight average molecular weight 1200 g / mol, molecular weight distribution 6.3) were mixed in a mixing machine for 30 min, and then sintered at 130 bar pressure and 230 °C for 30 min to obtain ultra-high molecular weight polyethylene sheet E. The performance test results of ultra-high molecular weight polyethylene sheet E are shown in Table 2.

[0051] Comparative Example 2

[0052] High-density polyethylene (HDPE) products, composed of high-molecular-weight polyethylene (HMWPE) and low-molecular-weight polyethylene (LMPE) components, were prepared using the Hostalen tandem process. This HDPE product is a PE100 grade pipe material. The mass ratio of HMWPE to LPE in the HDPE product is 49:51. The weight-average molecular weight (MAM) of the HDPE product is 252 kg / mol, and the molecular weight distribution is 29.5. The MLM component has a MLM of 409 kg / mol, and the LPE component has a MLM of 112 kg / mol. This HDPE was mixed in a mixer for 30 min, and then sintered at 130 bar pressure and 230°C for 30 min to obtain polyethylene sheet F. The performance test results of polyethylene sheet F are shown in Table 2.

[0053] Table 1. Characterization results of polyethylene composite particles

[0054]

[0055] Table 2 Friction and Tiber wear properties of the composite material after molding.

[0056]

[0057] As shown in Table 1 above, the polyethylene composite particles of Examples 1-4 have a lower initial elastic modulus than the ultra-high molecular weight polyethylene in Comparative Example 1 (see Appendix). Figure 2 Furthermore, in the rheological sweep frequency test, the linear correlation coefficient R between the loss modulus G” and the elastic modulus G’ curves is... 2 ≥0.99 (see appendix) Figure 3 This is mainly because in the polyethylene composite particles prepared in Examples 1-4, the ultra-high molecular weight polyethylene exhibits a nanosheet structure, while the synthetic mineral wax fills the spaces between the nanosheets during the polymerization process (see Appendix). Figure 1 The ultra-high molecular weight polyethylene (UHMWPE) nanosheets are low-entanglement UHMWPE with high crystallinity. The less entanglement there is in UHMWPE, the lower the initial elastic modulus in rheological tests. Furthermore, the synthetic mineral wax filling the spaces between the UHMWPE nanosheets can more quickly lubricate the UHMWPE molecular chains during the composite material molding process, thus promoting the opening of the UHMWPE molecular chains. This results in excellent molecular chain compatibility between the UHMWPE and synthetic mineral wax, leading to a higher linear correlation coefficient between the loss modulus G” and the elastic modulus G’ curves in rheological sweep frequency tests.

[0058] As shown in Table 2 above, the molded polyethylene composite material AD from Examples 1-4 exhibits superior Tabber abrasion resistance compared to the UHMWPE sheet E and high-density polyethylene sheet F formed by physical blending and sintering of UHMWPE and polyethylene wax in Comparative Examples 1-2. Furthermore, the difference in Tabber abrasion index between the surface, intermediate, and inner layers of the molded polyethylene composite material AD is no higher than 2 mg / 1000 r. In addition, compared to UHMWPE sheet E and high-density polyethylene sheet F, the molded polyethylene composite material AD has a lower coefficient of friction in the surface, intermediate, and inner layers, and the coefficient of friction after abrasion testing is also lower, with the difference in coefficient of friction between the surface, intermediate, and inner layers not exceeding 0.02. Therefore, the polyethylene composite material disclosed in this invention possesses characteristics such as low coefficient of friction, stable coefficient of friction, low abrasion, and excellent mechanical properties, significantly superior to commercially available UHMWPE. It can be used in fields such as general-purpose polyolefin material reinforcement and toughening, highway and railway bridge bearings, wear-resistant liners, mechanical parts, gas adsorption materials, and asphalt anti-rutting agents.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for preparing highly wear-resistant polyethylene composite particles, characterized in that, The polyethylene composite particles are prepared by the following method: a) The first reactor is purged with high-purity nitrogen at least 5 times. In the first reactor, the synthetic mineral wax is pre-dissolved in an alkane solvent at a concentration of 1-50 wt% at a dissolution temperature of 50-100 ℃. After the temperature of the first reactor reaches the set temperature, the comonomer, cocatalyst, and catalyst are added sequentially. Before the polymerization reaction occurs, the synthetic mineral wax accounts for 0.5-15 wt% of the total mass of the liquid phase in the first reactor. Ethylene is introduced to the set pressure, and the polymerization temperature is 90-100 ℃. After polymerization for a certain time t1, the reactor is transferred to the second reactor, where t1 is 1-30 min. b) The polymerization temperature in the second reactor is 50-90 ℃. After polymerization for a certain time t2, the reaction is stopped, and the product is discharged and dried to obtain polyethylene composite particles; wherein t2 is 1-300 min. The mass ratio of synthetic mineral wax to ultra-high molecular weight polyethylene in the polyethylene composite particles is 1:(1-200), and the particle size of the polyethylene composite particles is 50-500. μ In the polyethylene composite particles, ultra-high molecular weight polyethylene (UHMWPE) exhibits a nanosheet structure, with the spacing between adjacent UHMWPE nanosheets ranging from 50 to 10000 nm. The initial elastic modulus of the polyethylene composite particles at 160 °C is 0.05–0.5 MPa. After 30 min, a rheological sweep frequency test was conducted, and the loss modulus... G "and elastic modulus" G The linear correlation coefficient R of the curve 2 ≥0.99, and loss modulus G "Distributed in 10" 3 -10 7 Pa, elastic modulus G 'Distributed in 10 2 -10 7 Pa; The molecular weight distribution index of the highly wear-resistant polyethylene composite particles is 30-500; the Shore hardness is 50-100. The polyethylene composite material obtained by molding and processing the aforementioned high wear-resistant polyethylene composite granules has a tensile breaking strength of 30-120 MPa and a cantilever beam impact strength of 50-200 kJ / m. 2 .

2. The method for preparing highly wear-resistant polyethylene composite particles according to claim 1, characterized in that, The synthetic mineral wax is selected from one or more of polyethylene wax, polypropylene wax, polyamide wax, Fischer-Tropsch wax, paraffin wax, oxidized polyethylene wax, and oxidized polypropylene wax; the weight-average molecular weight of the synthetic mineral wax is 400-10000 g / mol, and the molecular weight distribution index is 2-10.

3. The method for preparing highly wear-resistant polyethylene composite particles according to claim 1, characterized in that, The alkane solvent is selected from one or more of n-butane, isobutane, n-pentane, isopentane, n-hexane, 2-methylpentane, 3-methylpentane, n-heptane, 2-methylhexane, 3-methylhexane, n-octane, 2-methylheptane, 3-methylheptane, n-nonane, and n-decane; the co-catalyst is selected from one or more of methylaluminoxane, modified methylaluminoxane, ethylaluminoxane, butylaluminoxane, trimethylaluminum, triethylaluminum, triisobutylaluminum, trihexylaluminum, trioctylaluminum, diethylaluminum chloride, diethylaluminum chloride, triphenylborane, tri(4-fluorophenyl)borane, tri(pentafluorophenyl)borane, tri(3,5-difluorophenyl)borane, and tri(2,4,6-trifluorophenyl)borane; the catalyst is selected from one or more of metallocene catalysts, post-transition metal catalysts, Ziegler-Natta catalysts, and FI catalysts.

4. The method for preparing highly wear-resistant polyethylene composite particles according to claim 1, characterized in that, The weight-average molecular weight of the ultra-high molecular weight polyethylene component is 700,000-7,000,000 g / mol, and the molecular weight distribution index is 2-10.

5. A high-wear-resistant polyethylene composite material obtained by processing polyethylene composite particles prepared by the method of claim 1, characterized in that, It is obtained by molding the polyethylene composite particles prepared by the method described in claim 1; the molding process is sintering, hot pressing, extrusion, rotational molding or injection molding; the Tyber abrasion index of the polyethylene composite material obtained by molding is 0.2-50 mg / 1000 r.

6. The high wear-resistant polyethylene composite material according to claim 5, characterized in that, The difference between the Tyber abrasion index of its surface and inner layers is no higher than 5 mg / 1000 r, and the friction coefficient of the polyethylene composite material is 0.08-0.3, with the difference between the friction coefficient of its surface and inner layers not exceeding 0.

02.

7. The application of the high wear-resistant polyethylene composite particles prepared by the method of any one of claims 1-4 in the reinforcement and toughening of polyolefin materials, the preparation of highway and railway bridge bearings, the preparation of wear-resistant liners, the preparation of gas adsorption materials, or the preparation of asphalt anti-rutting agents.

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