Polyurethane olefin composition, polyurethane composite material, preparation methods of polyurethane olefin composition and polyurethane composite material, and electrical equipment

Abstract

The invention discloses a polyurethane olefin composition, a polyurethane composite material and a preparation method thereof, and electrical equipment, and relates to the field of vinyl elastomer materials, the polyurethane olefin composition comprises a thermoplastic polyurethane elastomer, ultra-high molecular weight polyethylene and an ethylene-vinyl acetate-carbonyl terpolymer. According to the invention, the polyurethane composite material with excellent properties such as high impact strength, high tensile strength and aging resistance is obtained by mainly adopting the three polymers meeting the specific dosage relation limitation to be matched and used as a base material and introducing the modified glass fiber subjected to specific silane surface treatment as a reinforcing phase; the device can meet the use requirements in the field of electric power equipment such as electric meter boxes, and has wide application prospects.

Description

Technical Field

[0001] This invention relates to the field of vinyl elastomer materials, and more particularly to a polyurethane olefin composition, a polyurethane composite material, a method for preparing the same, and electrical equipment. Background Technology

[0002] In the field of power equipment, the selection and performance of materials are crucial, directly affecting the reliability, service life, and operational safety of the equipment. Especially in power equipment such as meter boxes, the materials used need to possess a variety of superior properties to cope with complex and changing operating environments and stringent performance requirements, such as accidental impacts during installation, transportation, or use. Therefore, materials need to have high impact resistance, ensuring they do not crack or break under external forces, thus guaranteeing the safety of internal components.

[0003] Currently, there are many types of vinyl elastomer materials on the market, but there are still many shortcomings in the material formulation design. They cannot balance the performance of various polymers well, and cannot simultaneously achieve a synergistic improvement in high impact strength, high tensile strength and good aging resistance. As a result, the composite materials cannot meet the requirements of power equipment for comprehensive material performance in practical applications. Summary of the Invention

[0004] To address the above problems, the present invention provides a polyurethane olefin composition, a polyurethane composite material, a method for preparing the same, and an electrical device.

[0005] In a first aspect, the present invention provides a polyurethane olefin composition comprising a thermoplastic polyurethane elastomer, ultra-high molecular weight polyethylene, and an ethylene-vinyl acetate-carbonyl terpolymer. The weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: 0.08≤X2-X1≤0.15.

[0006] Further, the thermoplastic polyurethane elastomer comprises 100 parts by weight; And / or, by weight, the ultra-high molecular weight polyethylene is 10 to 15 parts; And / or, by weight, the ethylene-vinyl acetate-carbonyl terpolymer is 20 to 30 parts.

[0007] Furthermore, the molecular weight of the ultra-high molecular weight polyethylene is 5 million to 6 million g / mol.

[0008] Furthermore, the ultra-high molecular weight polyethylene includes at least one of ultra-high molecular weight polyethylene with product model UHMWPEU050 F and ultra-high molecular weight polyethylene with product model UHMWPEU050, and the ethylene-vinyl acetate-carbonyl terpolymer includes ethylene-vinyl acetate-carbonyl terpolymer with product model Elvaloy 4924.

[0009] Secondly, based on the same inventive concept, the present invention provides a polyurethane composite material comprising the polyurethane olefin composition described in any one of the first aspects.

[0010] Furthermore, the polyurethane composite material also includes modified glass fibers with carboxyl-containing cage-type polysilsesquioxane surface treatment and additives.

[0011] Furthermore, the modified glass fiber is added at an amount of 8-15 wt% of the weight of the polyurethane olefin composition. And / or, the amount of the additive is 2 to 5 wt% of the weight of the polyurethane olefin composition.

[0012] Furthermore, the additive is composed of a lubricant, an antioxidant, a release agent, and a UV absorber in a weight ratio of (1~2):(3~5):(2~4):(8~10). The lubricant includes at least one of polyethylene wax and paraffin wax. The antioxidant is composed of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and dilaurate thiodipropionate in a weight ratio of (3~5):(1~2). The release agent includes Dow 3527, and the UV absorber includes UV-531.

[0013] Thirdly, based on the same inventive concept, the present invention provides a method for preparing the polyurethane composite material described in the second aspect above, the method comprising the following steps: The components of the polyurethane composite material are melt-blended to obtain a mixture; The mixture is injected into a mold and cured to obtain the polyurethane composite material.

[0014] Fourthly, based on the same inventive concept, the present invention provides an electrical device, the housing of which comprises the polyurethane olefin composition described in any one of the first aspects, the polyurethane composite material described in any one of the second aspects, or the polyurethane composite material prepared by the method for preparing the polyurethane composite material described in the third aspect.

[0015] The technical solutions provided in the embodiments of the present invention have at least the following advantages compared with the prior art: This invention provides a polyurethane olefin composition, a polyurethane composite material, a preparation method thereof, and power equipment. The invention mainly uses three polymers that meet specific dosage requirements as base materials and introduces modified glass fibers treated with specific silanes as reinforcing phases to obtain a polyurethane composite material with excellent properties such as high impact strength, high tensile strength, and aging resistance. This material can meet the application requirements of power equipment such as meter boxes and has broad application prospects. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating the preparation method of polyurethane composite material provided in this embodiment of the invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The technical solution provided by this invention is as follows: In a first aspect, the present invention provides a polyurethane olefin composition comprising a thermoplastic polyurethane elastomer, ultra-high molecular weight polyethylene, and an ethylene-vinyl acetate-carbonyl terpolymer. The weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: 0.08≤X2-X1≤0.15.

[0021] This invention provides a polyurethane olefin composition. The invention primarily uses three polymers in specific proportions as the base material and introduces modified glass fibers treated with a specific silane as the reinforcing phase. This results in a polyurethane composite material with excellent properties such as high impact strength, high tensile strength, and aging resistance (e.g., impact strength > 80 KJ / m², aging / UV resistance > 3000 h). This material can meet the needs of applications in power equipment such as meter boxes and has broad application prospects. Specifically: Thermoplastic polyurethane elastomer (TPU), as a continuous phase matrix, primarily provides elastic recovery. Its soft segments (polyether / polyester) impart flexibility, while the hard segments (urethane) form physical crosslinking points to enhance rigidity. However, pure TPU suffers from insufficient heat resistance and is prone to aging with long-term use. Ultra-high molecular weight polyethylene (UHMWPE) possesses excellent properties such as ultra-high tensile strength and impact toughness. Its long-chain structure forms a physical entanglement network in the matrix, which can effectively transfer stress and inhibit crack propagation. However, UHMWPE has poor compatibility with TPU and is prone to phase separation. Therefore, this invention introduces an appropriate amount of ethylene-vinyl acetate-carbonyl terpolymer (EVA-CO). The introduction of the carbonyl group (C=O) enhances the hydrogen bonding interaction with TPU, while the vinyl acetate (VA) unit improves the wettability with UHMWPE, promoting interfacial adhesion between TPU and UHMWPE. Through experimental optimization, it was determined that when the weight ratios X1 (UHMWPE / TPU, i.e., the weight ratio of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer) and X2 (EVA-CO / TPU, i.e., the weight ratio of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer) satisfy 0.08≤X2-X1≤0.15, the overall performance of the balanced terpolymer matrix system can be maximized. If X2-X1 is too small (e.g., <0.08), EVA-CO is insufficient, leading to increased phase separation between TPU and UHMWPE and a decrease in mechanical properties; if it is too large (>0.15), excessive EVA-CO will cause the matrix to soften, resulting in a reduction in mechanical properties. This range of differences ensures the optimal balance between the elasticity of TPU, the reinforcement of UHMWPE, and EVA-CO.

[0022] In this invention, the value of X2-X1 can be 0.08, 0.10, 0.12, 0.15 or any of the above values, preferably 0.10.

[0023] In this invention, the thermoplastic polyurethane elastomer can be directly selected from commercially available products such as WHT-1560 and WHT-4075 from Wanhua Chemical Group Co., Ltd., or it can be self-made according to the thermoplastic polyurethane elastomer preparation method disclosed in the prior art.

[0024] In one embodiment of the present invention, the thermoplastic polyurethane elastomer comprises 100 parts by weight; and / or, the ultra-high molecular weight polyethylene comprises 10 to 15 parts by weight, for example, 10, 12, 15 parts or any range thereof; and / or, the ethylene-vinyl acetate-carbonyl terpolymer comprises 20 to 30 parts by weight, for example, 20, 22, 25, 30 parts or any range thereof. Preferably, the thermoplastic polyurethane elastomer comprises 100 parts by weight, the ultra-high molecular weight polyethylene comprises 15 parts by weight, and the ethylene-vinyl acetate-carbonyl terpolymer comprises 25 parts by weight.

[0025] In one embodiment of the present invention, the molecular weight of the ultra-high molecular weight polyethylene is 5 million to 6 million g / mol, for example, it can be 5 million g / mol, 5.2 million g / mol, 5.5 million g / mol, 6 million g / mol, or any range between the above values. Specifically, ultra-high molecular weight polyethylene with product model UHMWPEU050 F (molecular weight of 5.5 million) and ultra-high molecular weight polyethylene with product model UHMWPEU050 (molecular weight of 5 million) can be selected. By limiting the molecular weight of the ultra-high molecular weight polyethylene to the above range, the present invention achieves better compatibility with thermoplastic polyurethane elastomers, which is beneficial to improving the mechanical properties of the material.

[0026] In one embodiment of the present invention, the ultra-high molecular weight polyethylene includes at least one of ultra-high molecular weight polyethylene with product model UHMWPEU050F and ultra-high molecular weight polyethylene with product model UHMWPEU050, and the ethylene-vinyl acetate-carbonyl terpolymer includes ethylene-vinyl acetate-carbonyl terpolymer with product model Elvaloy 4924.

[0027] Secondly, based on the same inventive concept, the present invention provides a polyurethane composite material comprising the polyurethane olefin composition described in any one of the first aspects. This significantly improves the overall performance of the polyurethane composite material.

[0028] In one embodiment of the present invention, the polyurethane composite material further includes modified glass fibers with carboxyl-containing cage-type polysilsesquioxane surface treatment and additives.

[0029] Compared to modified glass fibers treated with siloxanes such as silane coupling agent KH-550 (Chinese name: γ-aminopropyltriethoxysilane), this invention uses carboxyl-containing cage-like polysilsesquioxane to modify the surface of glass fibers, forming a three-dimensional network covalent bond structure. Simultaneously, the cage-like structure reduces glass fiber agglomeration through steric hindrance, thus significantly improving the performance of the polyurethane composite material. Specifically, the preparation of the modified glass fibers may include the following process: adding carboxyl-containing cage-like polysilsesquioxane and glass fibers to a mixed solution of ethanol and water in a volume ratio of 1:1.5, with the weight ratio of carboxyl-containing cage-like polysilsesquioxane, glass fibers, and the mixed solution being 3:10:35; subsequently, ultrasonic heating and stirring are performed at an ultrasonic power of 400W and a temperature of 50°C for 1 hour, followed by filtration and drying to obtain the modified glass fibers.

[0030] In this invention, the carboxyl-containing cage-type polysilsesquioxane can be directly selected from commercially available products such as those with the brand name or product model Q-0153526, specifically named CA0298-OctaMaleamic Acid POSS (cage-type polysilsesquioxane-octacarboxyl) or CA0296-Maleamic Acid-Isobutyl POSS (cage-type polysilsesquioxane-carboxylic Acids), or can be prepared in-house according to the preparation process disclosed in the prior art.

[0031] In one embodiment of the present invention, the amount of modified glass fiber added accounts for 8 to 15 wt% of the weight of the polyurethane olefin composition, for example, 8 wt%, 10 wt%, 12 wt%, 15 wt% or any range between the above values; and / or, the amount of additive added accounts for 2 to 5 wt% of the weight of the polyurethane olefin composition, for example, 2 wt%, 3 wt%, 4 wt%, 5 wt% or any range between the above values.

[0032] In one embodiment of the present invention, the additive is composed of a lubricant, an antioxidant, a release agent, and an ultraviolet absorber in a weight ratio of (1~2):(3~5):(2~4):(8~10), preferably composed of a lubricant, an antioxidant, a release agent, and an ultraviolet absorber in a weight ratio of 1.5:4:3:9; the lubricant includes at least one of polyethylene wax and paraffin wax, the antioxidant is composed of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and dilauryl thiodipropionate in a weight ratio of (3~5):(1~2), for example, it can be composed of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and dilauryl thiodipropionate in a weight ratio of 4:1.5, etc.; the release agent includes Dow 3527, and the ultraviolet absorber includes UV-531.

[0033] Thirdly, based on the same inventive concept, this invention provides a method for preparing the polyurethane composite material described in the second aspect above, such as... Figure 1 As shown, the preparation method of the polyurethane composite material includes the following steps: The components of the polyurethane composite material are melt-blended to obtain a mixture; The mixture is injected into a mold and cured to obtain the polyurethane composite material.

[0034] The preparation method of the polyurethane composite material provided by this invention is simple to operate, requires no additional specific equipment, and is suitable for industrial-scale mass production. Specifically, the preparation method of the above-mentioned polyurethane composite material can be carried out under the following process conditions: The components of the polyurethane olefin composition were added to a high-speed mixer and mixed evenly. Then, the mixture was added to a twin-screw extruder for melt blending. The temperature parameters of each zone in the twin-screw extruder were as follows: zone 1: 155℃, zone 2: 165℃, zone 3: 185℃, zone 4: 205℃, zone 5: 205℃, zone 6: 210℃, zone 7: 200℃, zone 8: 200℃, and zone 9: 200℃. This yielded the base material masterbatch. The base masterbatch and the remaining components of the polyurethane composite were stirred at 190°C and 200W ultrasonic power for 5 hours. Then, the mixture was poured into a polytetrafluoroethylene mold preheated to 120°C. The polytetrafluoroethylene mold was then placed in a drying oven at 100°C for 4.5 hours and then cooled to room temperature at a rate of 10°C / h. The mixture was then left to cure at room temperature for 24 hours to obtain the polyurethane composite.

[0035] Fourthly, based on the same inventive concept, this invention provides an electrical device whose casing comprises the polyurethane olefin composition described in any one of the first aspects, the polyurethane composite material described in any one of the second aspects, or a polyurethane composite material prepared using the method for preparing the polyurethane composite material described in the third aspect. This significantly improves the service life and operational safety of electrical equipment such as meter boxes.

[0036] Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in this invention can be purchased commercially or prepared using existing methods. Furthermore, unless otherwise specified or detailed, the steps and parameters involved can be performed according to the preparation processes and parameters disclosed in the prior art or directly using existing equipment according to the instruction manual; these will not be elaborated upon further in this invention document.

[0037] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed according to national standards. If no corresponding national standard exists, then generally accepted international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0038] Example 1 This example provides a polyurethane olefin composition comprising a thermoplastic polyurethane elastomer, ultra-high molecular weight polyethylene, and an ethylene-vinyl acetate-carbonyl terpolymer; wherein the weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: X2-X1 = 0.10; specifically: By weight, the thermoplastic polyurethane elastomer is 100 parts, the ultra-high molecular weight polyethylene is 15 parts, and the ethylene-vinyl acetate-carbonyl terpolymer is 25 parts. The thermoplastic polyurethane elastomer is specifically WHT-4075, the ultra-high molecular weight polyethylene is specifically UHMWPEU050 F (molecular weight of 5.5 million), and the ethylene-vinyl acetate-carbonyl terpolymer is specifically Elvaloy4924.

[0039] Example 2 This example provides a polyurethane olefin composition comprising a thermoplastic polyurethane elastomer, ultra-high molecular weight polyethylene, and an ethylene-vinyl acetate-carbonyl terpolymer; wherein the weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: X2-X1 = 0.15; specifically: By weight, the thermoplastic polyurethane elastomer is 100 parts, the ultra-high molecular weight polyethylene is 13 parts, and the ethylene-vinyl acetate-carbonyl terpolymer is 28 parts. The thermoplastic polyurethane elastomer is specifically WHT-4075, the ultra-high molecular weight polyethylene is specifically UHMWPEU050 F (molecular weight of 5.5 million), and the ethylene-vinyl acetate-carbonyl terpolymer is specifically Elvaloy4924.

[0040] Example 3 This example provides a polyurethane olefin composition comprising a thermoplastic polyurethane elastomer, ultra-high molecular weight polyethylene, and an ethylene-vinyl acetate-carbonyl terpolymer; wherein the weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: X2-X1 = 0.08; specifically: By weight, the thermoplastic polyurethane elastomer comprises 100 parts, the ultra-high molecular weight polyethylene comprises 12 parts, and the ethylene-vinyl acetate-carbonyl terpolymer comprises 20 parts. The thermoplastic polyurethane elastomer is specifically WHT-4075, the ultra-high molecular weight polyethylene is specifically UHMWPEU050 (molecular weight of 5 million), and the ethylene-vinyl acetate-carbonyl terpolymer is specifically Elvaloy4924.

[0041] Example 4 This example provides a polyurethane composite material, comprising the polyurethane olefin composition provided in Example 1, modified glass fibers after surface treatment with carboxyl-containing cage-type polysilsesquioxane, and an additive composed of a lubricant, an antioxidant, a release agent, and a UV absorber in a weight ratio of 1.5:4:3:9. The lubricant is polyethylene wax, the antioxidant is composed of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and dilaurate thiodipropionate in a weight ratio of 4:2, the release agent is Dow 3527, and the UV absorber is UV-531. The modified glass fiber is added at 12 wt% of the weight of the polyurethane olefin composition. Its preparation method includes the following steps: adding carboxyl-containing cage-type polysilsesquioxane and glass fiber (specifically, chopped glass fiber with a length of 12 mm) to a mixed solution of ethanol and water in a volume ratio of 1:1.5. The weight ratio of the carboxyl-containing cage-type polysilsesquioxane (specifically named CA0298-OctaMaleamic Acid POSS), glass fiber, and the mixed solution is 3:10:35. Subsequently, the mixture is ultrasonically heated and stirred for 1 hour at an ultrasonic power of 400 W and a temperature of 50 °C, then filtered and dried to obtain the modified glass fiber. The amount of the additive is 4 wt% of the weight of the polyurethane olefin composition.

[0042] The preparation method of the above-mentioned polyurethane composite material includes the following steps: The components of the polyurethane olefin composition were added to a high-speed mixer and mixed evenly. Then, the mixture was added to a twin-screw extruder for melt blending. The temperature parameters of each zone in the twin-screw extruder were as follows: zone 1: 155℃, zone 2: 165℃, zone 3: 185℃, zone 4: 205℃, zone 5: 205℃, zone 6: 210℃, zone 7: 200℃, zone 8: 200℃, and zone 9: 200℃. This yielded the base material masterbatch. The base masterbatch and the remaining components of the polyurethane composite were stirred at 190°C and 200W ultrasonic power for 5 hours. Then, the mixture was poured into a polytetrafluoroethylene mold preheated to 120°C. The polytetrafluoroethylene mold was then placed in a drying oven at 100°C for 4.5 hours and then cooled to room temperature at a rate of 10°C / h. The mixture was then left to cure at room temperature for 24 hours to obtain the polyurethane composite.

[0043] Example 5 This example provides a polyurethane composite material and its preparation method, which differs from Example 4 only in that: (1) The polyurethane olefin composition was modified to the polyurethane olefin composition provided in Example 2.

[0044] Example 6 This example provides a polyurethane composite material and its preparation method, which differs from Example 4 only in that: (1) The polyurethane olefin composition was modified to the polyurethane olefin composition provided in Example 3.

[0045] Comparative Example 1 This example provides a polyurethane olefin composition, which differs from Example 1 only in that: (1) The weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: X2-X1 is 0.03; specifically: by weight parts, the thermoplastic polyurethane elastomer is 100 parts, the ultra-high molecular weight polyethylene is 10 parts, and the ethylene-vinyl acetate-carbonyl terpolymer is 13 parts.

[0046] Comparative Example 2 This example provides a polyurethane olefin composition, which differs from Example 1 only in that: (1) The weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: X2-X1 is 0.20; specifically: by weight parts, the thermoplastic polyurethane elastomer is 100 parts, the ultra-high molecular weight polyethylene is 15 parts, and the ethylene-vinyl acetate-carbonyl terpolymer is 35 parts.

[0047] Comparative Example 3 This example provides a polyurethane composite material and its preparation method, which differs from Example 4 only in that: (1) The polyurethane olefin composition was adjusted to the polyurethane olefin composition provided in Comparative Example 1.

[0048] Comparative Example 4 This example provides a polyurethane composite material and its preparation method, which differs from Example 4 only in that: (1) The polyurethane olefin composition was adjusted to the polyurethane olefin composition provided in Comparative Example 2.

[0049] Comparative Example 5 This example provides a polyurethane composite material and its preparation method, which differs from Example 4 only in that: (1) The carboxyl-containing cage-type polysilsesquioxane in the preparation of modified glass fiber was changed to silane coupling agent KH-550.

[0050] Test case In this example, the impact resistance of the polyurethane composite materials obtained in Examples 4-6 and Comparative Examples 3-5 were tested according to ASTM D638 standard. The test results are shown in Table 1.

[0051] Table 1

[0052] As shown in Table 1, this invention significantly improves the impact resistance of polyurethane composites by using a combination of TPU, UHMWPE, and EVA-CO with a specific dosage relationship of 0.08≤X2-X1≤0.15 as the base material, and introducing modified glass fiber treated with a specific silane as the reinforcing phase. This results in an impact strength >130KJ / m². 2 The polyurethane composite material exhibits excellent tensile strength (>95MPa) and aging resistance (UV resistance >3000h), indicating that it combines high impact strength, high tensile strength, and aging resistance, meeting the application requirements of power equipment such as meter boxes, and has broad application prospects.

[0053] Various embodiments of the present invention may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of the invention; therefore, it should be considered that the range description has specifically disclosed all possible subranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the range referred to.

[0054] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A polyurethane olefin composition, characterized in that, Including thermoplastic polyurethane elastomers, ultra-high molecular weight polyethylene, and ethylene-vinyl acetate-carbonyl terpolymers; The weight ratio X1 of the ultra-high molecular weight polyethylene and the thermoplastic polyurethane elastomer, and the weight ratio X2 of the ethylene-vinyl acetate-carbonyl terpolymer and the thermoplastic polyurethane elastomer satisfy the following relationship: 0.08≤X2-X1≤0.

15.

2. The polyurethane olefin composition according to claim 1, characterized in that, The thermoplastic polyurethane elastomer comprises 100 parts by weight. And / or, by weight, the ultra-high molecular weight polyethylene is 10 to 15 parts; And / or, by weight, the ethylene-vinyl acetate-carbonyl terpolymer is 20 to 30 parts.

3. The polyurethane olefin composition according to claim 1, characterized in that, The ultra-high molecular weight polyethylene has a molecular weight of 5 million to 6 million g / mol.

4. The polyurethane olefin composition according to claim 1, characterized in that, The ultra-high molecular weight polyethylene includes at least one of ultra-high molecular weight polyethylene with product model UHMWPEU050 F and ultra-high molecular weight polyethylene with product model UHMWPEU050, and the ethylene-vinyl acetate-carbonyl terpolymer includes ethylene-vinyl acetate-carbonyl terpolymer with product model Elvaloy 4924.

5. A polyurethane composite material, characterized in that, The polyurethane composite material includes any one of the polyurethane olefin compositions according to claims 1 to 4.

6. The polyurethane composite material according to claim 5, characterized in that, The polyurethane composite material also includes modified glass fibers with carboxyl-containing cage-type polysilsesquioxane surface treatment and additives.

7. The polyurethane composite material according to claim 6, characterized in that, The amount of modified glass fiber added is 8-15 wt% of the weight of the polyurethane olefin composition; And / or, the amount of the additive is 2 to 5 wt% of the weight of the polyurethane olefin composition.

8. The polyurethane composite material according to claim 6, characterized in that, The additive is composed of a lubricant, an antioxidant, a release agent, and a UV absorber in a weight ratio of (1~2):(3~5):(2~4):(8~10). The lubricant includes at least one of polyethylene wax and paraffin wax. The antioxidant is composed of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and dilaurate thiodipropionate in a weight ratio of (3~5):(1~2). The release agent includes Dow 3527, and the UV absorber includes UV-531.

9. A method for preparing a polyurethane composite material according to any one of claims 5 to 8, characterized in that, The preparation method of the polyurethane composite material includes the following steps: The components of the polyurethane composite material are melt-blended to obtain a mixture; The mixture is injected into a mold and cured to obtain the polyurethane composite material.

10. An electrical device, characterized in that, The housing of the power equipment comprises the polyurethane olefin composition of any one of claims 1 to 4, the polyurethane composite material of any one of claims 5 to 8, or the polyurethane composite material prepared by the method of preparing the polyurethane composite material of claim 9.

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