High temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material and modification method

Abstract

The application discloses a kind of high-temperature-resistant injection molding grade ultra-high molecular weight polyethylene composite material and modification method, it is related to composite material technical field, first with specific proportion fluorine-containing silane coupling agent, thermal initiator, crosslinking catalyst is mixed to ultra-high molecular weight polyethylene, then again with low molecular weight polyolefin flow modifier is compounded, the modification of high-temperature-resistant injection molding grade ultra-high molecular weight polyethylene composite material is realized.This method has the characteristics of simple process, low cost, mild reaction condition and wide application field, and has good development prospect.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, specifically relating to a high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material and its modification method. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPE) is a linear thermoplastic engineering plastic with excellent comprehensive properties. Its average molecular weight ranges from approximately 350,000 to 8 million. Due to its high molecular weight, it possesses unparalleled superior impact resistance, abrasion resistance, self-lubrication, and chemical corrosion resistance compared to other plastics. Furthermore, UHMWPE exhibits excellent low-temperature performance, maintaining high impact strength even at -40°C and can be used at temperatures as low as -269°C. However, due to its large molecular weight and low critical shear viscosity, UHMWPE is prone to phase separation during injection molding and is extremely difficult to extrude. To date, injection molding technology has not been successfully applied on a large scale in the UHMWPE field. Additionally, UHMWPE's relatively low heat distortion temperature of 85°C also limits its application in high-temperature environments.

[0003] Patent CN102850627 discloses an injection-molding grade carbon fiber reinforced ultra-high molecular weight polyethylene and its preparation method. The mixture comprises the following components by weight: ultra-high molecular weight polyethylene: 45-75 parts; liquid crystal polymer (LCP): 5-20 parts; MA-POE (maleic anhydride grafted polyolefin elastomer): 5-10 parts; carbon fiber: 15-35 parts. All raw materials are mixed in a mixer, and then extruded and granulated using a twin-screw extruder at a temperature of 200-240°C to obtain the injection-molding grade carbon fiber reinforced ultra-high molecular weight polyethylene. This injection-molding grade carbon fiber reinforced ultra-high molecular weight polyethylene has advantages such as ultra-toughness, low-temperature resistance, high wear resistance, high strength, good dimensional stability, electrical conductivity, and high rigidity. However, due to the use of liquid crystal polymer and other components, its versatility is relatively low, and it requires twin-screw granulation, resulting in higher costs.

[0004] Patent CN109401171 discloses a high-temperature resistant ultra-high molecular weight polyethylene (UHMWPE) pipe and its preparation method. The method involves high-speed homogenization of 1,2,2-trifluorovinyltriphenylsilane, octavinyl-POSS (polystyrene spherical cluster siloxane), an initiator, fluorinated adamantyl condensate, UHMWPE, and glycidyl methacrylate-grafted UHMWPE fibers, followed by extrusion molding using a twin-screw extruder to obtain the high-temperature resistant UHMWPE pipe. However, the raw material cost is high, the process is cumbersome, and its versatility is low. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material and a modification method therein. The technical problem to be solved by this invention is achieved through the following technical solution:

[0006] This invention provides a method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, comprising:

[0007] Step 1: Mix the fluorosilane coupling agent, thermal initiator, and crosslinking catalyst to obtain a mixed solvent;

[0008] Step 2: Use spray dispersion to blend and compound ultra-high molecular weight polyethylene resin with the mixed solvent to obtain an intermediate;

[0009] Step 3: The intermediate is blended with a low molecular weight polyolefin flow modifier to obtain a high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material.

[0010] The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 1-5 g / 10 min and polyethylene with a melt index of 5-10 g / 10 min at a weight ratio of 1:1-5:1 under a load of 2.16 kg.

[0011] The structural formula of the fluorinated silane coupling agent is:

[0012] ;

[0013] Wherein, R1, R2, and R3 are methoxy or ethoxy groups; Rf is... n is an integer from 1 to 10; X is one of methylene, ethylene, and imino; X1 is one of perfluoromethylene, methylene, imino, ester, and oxygen; Y is one of methyl, ethyl, propyl, amino, hydrogen, and fluorine.

[0014] In one embodiment of the present invention, the mass ratio of the fluorinated silane coupling agent, the thermal initiator and the crosslinking catalyst is (1-10):1:3.

[0015] In one embodiment of the present invention, the mass of the mixed solvent is 0.1%-5% of the mass of the ultra-high molecular weight polyethylene resin.

[0016] In one embodiment of the present invention, the mass ratio of the intermediate to the low molecular weight polyolefin flow modifier is 9:1 to 1:9.

[0017] In one embodiment of the present invention, the viscosity-average molecular weight of the ultra-high molecular weight polyethylene resin is 1 million to 7 million.

[0018] In one embodiment of the present invention, the thermal initiator is: dicumyl peroxide, benzoyl peroxide, dicumyl hydroperoxide or 2,5-dimethyl-2,5-ditert-butylperoxide.

[0019] In one embodiment of the present invention, the crosslinking catalyst is: dibutyltin dilaurate, stannous octoate, di(dodecyl sulfide)dibutyltin or dibutyltin diacetate.

[0020] This invention provides a high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material, which is obtained by the modification method of the high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material described in any of the above embodiments.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. The modification method of the high-temperature injection molding grade ultra-high molecular weight polyethylene composite material of the present invention introduces a cross-linked structure into the ultra-high molecular weight polyethylene (UHMWPE) molecular chain through the synergistic effect of fluorosilane coupling agent, thermal initiator, and cross-linking catalyst. During the spray dispersion process, the surface modification and cross-linking structure regulation of the ultra-high molecular weight polyethylene resin are achieved, effectively inhibiting the slippage of the molecular chain at high temperature. At the same time, the heat resistance properties of fluorosilane further delay the thermal degradation of the material, so that the composite material can still maintain excellent mechanical properties and dimensional stability under high temperature environment.

[0023] 2. The modification method of the high-temperature injection molding grade ultra-high molecular weight polyethylene composite material of the present invention uses a low molecular weight polyolefin flow modifier with a specific melt index range (1-10g / 10min), especially by compounding high and low melt index polyethylene (1:1-5:1), which effectively reduces the melt viscosity of ultra-high molecular weight polyethylene and solves the problem of difficult injection molding of traditional ultra-high molecular weight polyethylene.

[0024] 3. The modification method of the high-temperature injection-grade ultra-high molecular weight polyethylene composite material of the present invention adopts a stepwise compounding process. First, the nanoscale modifier is distributed by spray dispersion, and then a flow modifier is introduced to optimize the rheological properties. While retaining the high strength of ultra-high molecular weight polyethylene, the precise control of low molecular weight polyolefins achieves the synergistic optimization of high melt flowability and excellent mechanical properties. The stepwise blending design avoids component segregation caused by direct mixing.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0026] Figure 1 This is a flowchart of a modification method for a high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material provided in an embodiment of the present invention. Detailed Implementation

[0027] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material and its modification method based on the present invention.

[0028] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and concrete understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the technical solutions of the present invention.

[0029] In a first aspect, embodiments of the present invention provide a method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is a flowchart of a modification method for high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the modification method of high-temperature injection molding grade ultra-high molecular weight polyethylene composite material in this embodiment may include the following steps:

[0030] Step 1: Mix the fluorinated silane coupling agent, thermal initiator and crosslinking catalyst to obtain a mixed solvent.

[0031] Optionally, the mass ratio of the fluorosilane coupling agent, the thermal initiator, and the crosslinking catalyst is (1-10):1:3. Preferably, the mass ratio is (1-5):1:3.

[0032] In this embodiment, the structural formula of the fluorinated silane coupling agent is:

[0033] ;

[0034] Wherein, R1, R2, and R3 are methoxy or ethoxy groups; Rf is... n is an integer from 1 to 10; X is one of methylene, ethylene, and imino; X1 is one of perfluoromethylene, methylene, imino, ester, and oxygen; Y is one of methyl, ethyl, propyl, amino, hydrogen, and fluorine.

[0035] In this embodiment, the thermal initiator is: dicumyl peroxide, benzoyl peroxide, dicumyl hydroperoxide or 2,5-dimethyl-2,5-di-tert-butylperoxide.

[0036] In this embodiment, the crosslinking catalyst is: dibutyltin dilaurate, stannous octoate, di(dodecyl sulfide)dibutyltin or dibutyltin diacetate.

[0037] Step 2: Use spray dispersion to blend and compound ultra-high molecular weight polyethylene resin with a mixed solvent to obtain an intermediate;

[0038] Optionally, the mass of the mixed solvent is 0.1%-5% of the mass of the ultra-high molecular weight polyethylene resin.

[0039] In this embodiment, the viscosity-average molecular weight of the ultra-high molecular weight polyethylene resin is 1 million to 7 million.

[0040] In this embodiment, through the synergistic effect of fluorinated silane coupling agent, thermal initiator, and crosslinking catalyst, a crosslinking structure is introduced into the ultra-high molecular weight polyethylene (UHMWPE) molecular chain. During the spray dispersion process, the surface modification and crosslinking structure regulation of the UHMWPE resin are achieved, effectively suppressing the slippage of the molecular chain at high temperature. At the same time, the heat resistance of the fluorinated silane further delays the thermal degradation of the material, enabling the composite material to maintain excellent mechanical properties and dimensional stability under high temperature conditions.

[0041] Step 3: Blend the intermediate with a low molecular weight polyolefin flow modifier to obtain a high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material.

[0042] The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 1-5 g / 10 min and polyethylene with a melt index of 5-10 g / 10 min at a weight ratio of 1:1-5:1 under a load of 2.16 kg.

[0043] Optionally, the mass ratio of the intermediate to the low molecular weight polyolefin flow modifier is 9:1 to 1:9. Preferably, the mass ratio is 8:2 to 6:4.

[0044] In this embodiment, a low molecular weight polyolefin flow modifier with a specific melt index range (1-10 g / 10 min) is used, especially by blending high and low melt index polyethylene (1:1-5:1), which effectively reduces the melt viscosity of ultra-high molecular weight polyethylene and solves the problem of difficult injection molding of traditional ultra-high molecular weight polyethylene.

[0045] The modification method of high-temperature injection-grade ultra-high molecular weight polyethylene composite material in this invention uses a stepwise compounding process. First, nanoscale modifiers are distributed through spray dispersion, and then flow modifiers are introduced to optimize rheological properties. While retaining the high strength of ultra-high molecular weight polyethylene, the precise control of low molecular weight polyolefins achieves synergistic optimization of high melt flowability and excellent mechanical properties. The stepwise blending design avoids component segregation caused by direct mixing.

[0046] Furthermore, specific embodiments and the modification method of the high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material of the present invention, as well as the performance of the high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material obtained by the modification method, will be described.

[0047] Example 1

[0048] A method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, comprising:

[0049] Step 1: Mix 3-(methacryloyloxy)perfluoropropylethyltrimethoxysilane, dicumyl peroxide and dibutyltin dilaurate in a mass ratio of 2:1:3 to obtain a mixed solvent;

[0050] Step 2: Using spray dispersion, ultra-high molecular weight polyethylene resin with a viscosity-average molecular weight of 3 million is blended and compounded with a mixed solvent to obtain an intermediate, wherein the mass of the mixed solvent is 1.5% of the mass of the ultra-high molecular weight polyethylene resin;

[0051] Step 3: 7 parts of intermediate and 3 parts of low molecular weight polyolefin flow modifier are blended and compounded to obtain high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 2 g / 10 min and polyethylene with a melt index of 7 g / 10 min in a weight ratio of 2:1.

[0052] The high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material of Example 1, after injection molding standard products, had a Vicat soft point temperature of 149.8℃ according to GB / T1633-2000 and a tensile strength of 37.2MPa according to GB / T1040.2-2006.

[0053] Example 2

[0054] A method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, comprising:

[0055] Step 1: Mix 2-(acryloyloxy)perfluoroethylmethyltrimethoxysilane, diisopropylbenzene hydrogen peroxide and stannous octoate in a mass ratio of 1:1:3 to obtain a mixed solvent;

[0056] Step 2: Using spray dispersion, ultra-high molecular weight polyethylene resin with a viscosity-average molecular weight of 2 million is blended and compounded with a mixed solvent to obtain an intermediate, wherein the mass of the mixed solvent is 0.1% of the mass of the ultra-high molecular weight polyethylene resin;

[0057] Step 3: 8 parts of intermediate and 2 parts of low molecular weight polyolefin flow modifier are blended and compounded to obtain high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 1.5 g / 10 min and polyethylene with a melt index of 6 g / 10 min in a weight ratio of 1:1.

[0058] The high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material of Example 2, after injection molding standard products, had a Vicat soft point temperature of 147.3℃ according to GB / T1633-2000 and a tensile strength of 35.3MPa according to GB / T1040.2-2006.

[0059] Example 3

[0060] A method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, comprising:

[0061] Step 1: Mix 2-(methacryloyloxy)perfluoroethylethyltrimethoxysilane, 2,5-dimethyl-2,5-di-tert-butylperoxyhexane and dibutyltin diacetate in a mass ratio of 5:1:3 to obtain a mixed solvent;

[0062] Step 2: Using spray dispersion, ultra-high molecular weight polyethylene resin with a viscosity-average molecular weight of 5 million is blended and compounded with a mixed solvent to obtain an intermediate, wherein the mass of the mixed solvent is 5% of the mass of the ultra-high molecular weight polyethylene resin;

[0063] Step 3: 6 parts of intermediate and 4 parts of low molecular weight polyolefin flow modifier are blended and compounded to obtain high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 5 g / 10 min and polyethylene with a melt index of 10 g / 10 min in a weight ratio of 2:1.

[0064] The high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material of Example 3, after injection molding standard products, had a Vicat soft point temperature of 145.8℃ according to GB / T1633-2000 and a tensile strength of 34.7MPa according to GB / T1040.2-2006.

[0065] Example 4

[0066] A method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, comprising:

[0067] Step 1: Mix 3-(methacryloyloxy)perfluoropropylethyltrimethoxysilane, benzoyl peroxide, and di(dodecyl sulfide)dibutyltin in a mass ratio of 3:1:3 to obtain a mixed solvent;

[0068] Step 2: Using spray dispersion, ultra-high molecular weight polyethylene resin with a viscosity-average molecular weight of 7 million is blended and compounded with a mixed solvent to obtain an intermediate, wherein the mass of the mixed solvent is 3% of the mass of the ultra-high molecular weight polyethylene resin;

[0069] Step 3: 1 part of intermediate and 9 parts of low molecular weight polyolefin flow modifier are blended and compounded to obtain high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 2 g / 10 min and polyethylene with a melt index of 7 g / 10 min in a weight ratio of 5:1.

[0070] Example 5

[0071] A method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, comprising:

[0072] Step 1: Mix 3-(methacryloyloxy)perfluoropropylethyltrimethoxysilane, dicumyl peroxide and dibutyltin dilaurate in a mass ratio of 2:1:3 to obtain a mixed solvent;

[0073] Step 2: Using spray dispersion, ultra-high molecular weight polyethylene resin with a viscosity-average molecular weight of 1 million is blended and compounded with a mixed solvent to obtain an intermediate, wherein the mass of the mixed solvent is 1.5% of the mass of the ultra-high molecular weight polyethylene resin;

[0074] Step 3: 9 parts of intermediate and 1 part of low molecular weight polyolefin flow modifier are blended and compounded to obtain high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 1 g / 10 min and polyethylene with a melt index of 5 g / 10 min in a weight ratio of 3:1.

[0075] Comparative Example 1

[0076] A method for preparing a high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material, comprising:

[0077] Step 1: Mix 3-(methacryloyloxy)propyltrimethoxysilane, dicumyl peroxide and dibutyltin dilaurate in a mass ratio of 2:1:3 to obtain a mixed solvent;

[0078] Step 2: Using spray dispersion, ultra-high molecular weight polyethylene resin with a viscosity-average molecular weight of 3 million is blended and compounded with a mixed solvent to obtain an intermediate, wherein the mass of the mixed solvent is 1.5% of the mass of the ultra-high molecular weight polyethylene resin;

[0079] Step 3: 7 parts of intermediate and 3 parts of low molecular weight polyolefin flow modifier are blended and compounded to obtain high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 2.5 g / 10 min and polyethylene with a melt index of 7.5 g / 10 min in a weight ratio of 2:1.

[0080] The high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material of Comparative Example 1, after injection molding standard products, had a Vicat soft point temperature of 138.5℃ according to GB / T1633-2000 and a tensile strength of 28.5MPa according to GB / T1040.2-2006.

[0081] Secondly, embodiments of the present invention provide a high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material, which is obtained by the modification method of the high-temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material provided in the first aspect above.

[0082] For details regarding the specific content and corresponding beneficial effects of this high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material, please refer to the relevant content on the modification method of the high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material provided in the first aspect, which will not be repeated here.

[0083] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0084] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0085] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for modifying high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite materials, characterized in that, include: Step 1: Mix the fluorosilane coupling agent, thermal initiator, and crosslinking catalyst to obtain a mixed solvent; Step 2: Use spray dispersion to blend and compound ultra-high molecular weight polyethylene resin with the mixed solvent to obtain an intermediate; Step 3: The intermediate is blended with a low molecular weight polyolefin flow modifier to obtain a high temperature resistant injection molding grade ultra-high molecular weight polyethylene composite material. The low molecular weight polyolefin flow modifier is a mixture of polyethylene with a melt index of 1-5 g / 10 min and polyethylene with a melt index of 5-10 g / 10 min at a weight ratio of 1:1-5:1 under a load of 2.16 kg. The structural formula of the fluorinated silane coupling agent is: ； Wherein, R1, R2, and R3 are methoxy or ethoxy groups; Rf is... n is an integer from 1 to 10; X is one of methylene, ethylene, and imino; X1 is one of perfluoromethylene, methylene, imino, ester, and oxygen; Y is one of methyl, ethyl, propyl, amino, hydrogen, and fluorine.

2. The modification method for high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to claim 1, characterized in that, The mass ratio of the fluorinated silane coupling agent, the thermal initiator, and the crosslinking catalyst is (1-10):1:

3.

3. The modification method for high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to claim 1, characterized in that, The mass of the mixed solvent is 0.1%-5% of the mass of the ultra-high molecular weight polyethylene resin.

4. The modification method for high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to claim 1, characterized in that, The mass ratio of the intermediate to the low molecular weight polyolefin flow modifier is 9:1 to 1:

9.

5. The modification method for high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to claim 1, characterized in that, The viscosity-average molecular weight of the ultra-high molecular weight polyethylene resin is 1 million to 7 million.

6. The modification method of the high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to claim 1, characterized in that, The thermal initiator is: dicumyl peroxide, benzoyl peroxide, dicumyl hydroperoxide or 2,5-dimethyl-2,5-di-tert-butylperoxide.

7. The modification method for high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to claim 1, characterized in that, The crosslinking catalyst is: dibutyltin dilaurate, stannous octoate, di(dodecyl sulfide)dibutyltin or dibutyltin diacetate.

8. A high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material, characterized in that, It is obtained by modifying the high-temperature resistant injection-molding grade ultra-high molecular weight polyethylene composite material according to any one of claims 1-7.

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