Composite material as well as preparation method and application thereof

Abstract

The invention discloses a composite material for an electrolytic cell frame and accessories, and relates to the field of polymer resin materials. According to the composite material, polycarbonate is added on the basis of polyphenylene sulfide (PPS), the effects of toughening and improving the mechanical strength are achieved, meanwhile, hexagonal boron nitride and glass fibers are added according to the specific amount ratio, polyphenylene sulfide is modified through the synergistic interaction mechanism of the hexagonal boron nitride and the glass fibers, and the heat conduction performance of the composite material is remarkably improved; the composite material has the advantages of high thermal conductivity and good mechanical properties. Meanwhile, the invention further discloses a preparation method of the composite material and application of the composite material in the frame and the accessory of the electrolytic cell, a new material choice is provided for the frame and the accessory of the electrolytic cell, and the prepared frame and the accessory of the electrolytic cell can ensure the temperature uniformity of the material and avoid the influence of thermal stress on the durability of the material in use; and the demand of collaborative optimization of light weight and heat management is met.

Description

TECHNICAL FIELD

[0001] The present application relates to a PPS composite material, in particular a PPS composite material for electrolytic cell frame and accessories, and a preparation method and application thereof. BACKGROUND

[0002] The traditional electrolytic cell pole frame is made of metal material after coiling and machining. For square or other special-shaped frame structure, the existing metal material processing technology is complex and the construction period is long, and the processing efficiency is low. At the same time, the traditional round metal material is heavy and causes inconvenience for later maintenance and disassembly.

[0003] In recent years, polyphenylene sulfide (PPS) has been paid attention and explored for application in electrolytic cell frame for water electrolysis hydrogen production due to its good mechanical properties, self-retardant properties, excellent fatigue resistance and temperature resistance. However, the poor thermal conductivity of PPS material will lead to uneven temperature distribution of the pole frame, and thermal stress will cause structural deformation of the pole frame during long-term use, and even brittle fracture and other problems. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a composite material with excellent thermal conductivity. The composite material used to prepare the electrolytic cell frame and accessories can ensure uniformity of material temperature during use, avoid the influence of thermal stress on material durability, and has good mechanical strength. At the same time, the present application also provides a preparation method of the composite material and its application in electrolytic cell frame and accessories.

[0005] To achieve the above purpose, in the first aspect, the present application provides a composite material with high thermal conductivity, the preparation raw material of the composite material includes the following components by weight: polyphenylene sulfide 25-60 parts, polycarbonate 10-30 parts, hexagonal boron nitride 15-45 parts, glass fiber 5-20 parts, compatibilizer 0.5-3 parts, dispersant 1-5 parts, antioxidant 0.1-0.5 parts; the mass percentage content of hexagonal boron nitride in the preparation raw material of the composite material is 15-45%; the mass percentage content of glass fiber in the preparation raw material of the composite material is 5-20%.

[0006] In the composite material of the present application, by adding hexagonal boron nitride and glass fiber in the preparation raw material and controlling the addition amount range of hexagonal boron nitride and glass fiber in the preparation raw material, it is found that the two can modify polyphenylene sulfide together and improve the thermal conductivity of the prepared composite material.

[0007] The mass percentage of the hexagonal boron nitride in the preparation raw material of the composite material needs to be controlled in 15-45%, and at the same time, the mass percentage of the glass fiber needs to be controlled in 5-20%. Specifically, the mass percentage of the hexagonal boron nitride in the preparation raw material of the composite material can be any selected value or a range composed of any selected values in 15%, 16%, 28%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 40%, 42%, and 45%. The mass percentage of the glass fiber in the preparation raw material of the composite material can be any selected value or a range composed of any selected values in 5%, 6%, 8%, 10%, 12%, 14%, 16%, and 18%.

[0008] The polyphenylene sulfide and the polycarbonate in the preparation raw material of the composite material described in the present application can be selected from specific substances commonly used in the prior art, for example, but not limited to, the polyphenylene sulfide can be purchased from Zhejiang Xinhengcheng Co., Ltd., Sino-Plastics (Shanghai) International Trading Co., Ltd., and Bori Plastics Co., Ltd.; and the polycarbonate can be purchased from Wanhua Chemical Group Co., Ltd., Covestro (China) Co., Ltd., and Mitsubishi Engineering-Plastics Corporation.

[0009] The present inventors found in the research that too much or too little addition amount of the hexagonal boron nitride and the glass fiber will affect the thermal conductivity or the mechanical property of the prepared composite material, and through repeated tests, it was finally found that when the mass percentages of the two are in the ranges as described above, the two are used to modify the polyphenylene sulfide, the thermal conductivity of the finally prepared composite material is obviously improved, and at the same time, the composite material has good mechanical properties.

[0010] Preferably, the particle diameter of the hexagonal boron nitride is 5-20 μm. The particle size of the hexagonal boron nitride in the preparation raw material of the composite material described in the present application has certain influence on the modification process and the thermal conductivity of the prepared composite material, and the present inventors found that when the particle diameter of the hexagonal boron nitride is 5-20 μm, the improvement of the thermal conductivity of the composite material is more favorable under the same conditions. The particle diameter of the hexagonal boron nitride can be detected by using a conventional method known in the art, for example, a scanning electron microscope. The hexagonal boron nitride with the diameter in the range can be obtained by using a conventional method in the art or purchased commercially.

[0011] Preferably, the length of the glass fiber is 1-5 mm and the diameter is 10-20 μm. The present inventors have found that the length and diameter of the glass fiber also have certain influence on the thermal conductivity and mechanical properties of the resulting composite material, and the length of the glass fiber, preferably chopped glass fiber, is preferably 1-5 mm and the diameter is preferably 10-20 μm. The length and diameter of the glass fiber can be detected by conventional methods in the art, for example, but not limited to, optical microscopy. The glass fiber with the length and diameter in the range can be prepared by conventional methods known in the art or purchased commercially.

[0012] Preferably, the compatibilizer comprises at least one of glycerol stearate (SAG), styrene-ethylene-butylene-styrene block copolymer (SEBS), maleic anhydride grafted polyethylene (PE-g-MAH). The compatibilizer in the raw materials for preparing the composite material of the present application can improve the interfacial compatibility between the polyphenylene sulfide, polycarbonate, hexagonal boron nitride, glass fiber and the like, so as to improve the overall performance of the composite material, such as the thermal conductivity. The compatibilizer is preferably, but not limited to, at least one of glycerol stearate (SAG), styrene-ethylene-butylene-styrene block copolymer (SEBS), maleic anhydride grafted polyethylene (PE-g-MAH), which can be prepared by conventional methods known in the art or purchased commercially.

[0013] Preferably, the dispersant comprises at least one of polyarylether sulfone oligomer, styrene-acrylate copolymer, trifluoropropylmethyl polysiloxane. In the composite material of the present application, the dispersant can promote the uniform dispersion of polyphenylene sulfide, polycarbonate, hexagonal boron nitride, glass fiber and the like, so as to make the prepared composite material have uniform and stable thermal conductivity. The dispersant is preferably, but not limited to, at least one of polyarylether sulfone oligomer, styrene-acrylate copolymer, trifluoropropylmethyl polysiloxane, which can be prepared by conventional methods known in the art or purchased commercially.

[0014] Preferably, the antioxidant includes at least one of tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite, 4,4'-bis(alpha,alpha-dimethylbenzyl) diphenylamine, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl) benzene. The addition of the antioxidant in the composite material of the present application can delay or prevent the deterioration of the prepared composite material due to oxidation, protect the prepared composite material from oxidative damage by scavenging free radicals and inhibiting oxidative chain reactions, thereby prolonging the service life and maintaining the performance stability. The antioxidant is preferably, but not limited to, at least one of tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylenediphosphonite, 4,4'-bis(alpha,alpha-dimethylbenzyl) diphenylamine, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl) benzene, which can be prepared by conventional methods known in the art or purchased commercially.

[0015] Preferably, the preparation raw materials of the composite material further include 0-3 parts by weight of an auxiliary agent, and the auxiliary agent includes at least one of a lubricant, a plasticizer, a release agent, and a pigment. A small amount of auxiliary agent can also be added in the composite material of the present application, which can be one or more of a lubricant, a plasticizer, a release agent, and a pigment, and can be selected according to the requirements of the use scenario. The lubricant, plasticizer, release agent, and pigment are selected from conventional substances in the art.

[0016] In a second aspect, the present application also provides a preparation method of the composite material as described above, which is simple in process conditions and convenient for industrialized application. To achieve the object, the technical scheme adopted by the present application is as follows: a preparation method of the composite material as described above, which comprises the following steps:

[0017] S1, uniformly mixing the remaining preparation raw materials except polycarbonate and glass fibers, adding them into a twin-screw extruder for melt blending, extruding and granulating to obtain an intermediate mixture;

[0018] S2, adding polycarbonate and glass fibers into the intermediate mixture obtained in step S1 into a twin-screw extruder for melt blending, extruding and granulating to obtain the composite material.

[0019] In the preparation method of the composite material, first, the remaining preparation raw materials except polycarbonate and glass fiber are uniformly mixed to obtain an intermediate mixture, then further mixed with polycarbonate and glass fiber, added to a twin-screw extruder for melt blending, and after extruding and granulating, the composite material can be obtained. In step S1, the remaining preparation raw materials except polycarbonate and glass fiber are first mixed and melt-extruded, which can avoid thermal oxidative degradation of polycarbonate when added at the same time, resulting in molecular chain rupture, affecting the mechanical properties of the prepared composite material or causing yellowing problems. The glass fiber is added in step S2, which can avoid affecting the morphology and dispersion uniformity of the glass fiber in step S1, causing fiber fracture due to excessive shearing of the glass fiber, and affecting the mechanical properties of the prepared composite material. The process steps in the preparation method are simple, the equipment used is conventional in the art, and the method has the advantages of low cost and easy large-scale industrial use.

[0020] Preferably, in the preparation method of the composite material, the polyphenylene sulfide, polycarbonate, hexagonal boron nitride and glass fiber are dried to constant weight, and then prepared according to the methods of steps S1 and S2 as described above. The drying temperature to constant weight is selected according to actual needs, for example, but not limited to 80°C.

[0021] The main screw rotation speed and the feeding screw rotation speed of the twin-screw extruder in steps S1 and S2 can be adjusted according to actual use, preferably, the main screw rotation speed of the twin-screw extruder is 75-95 rpm, and the feeding screw rotation speed is 25-40 rpm. More preferably, the main screw rotation speed of the twin-screw extruder is 80 rpm, and the feeding screw rotation speed is 30 rpm.

[0022] Preferably, in step S2, the glass fiber is divided into three parts and added to the front, middle and rear sections of the twin-screw extruder, and the mass ratio of the glass fiber added to the front, middle and rear sections is: front:middle:rear=(1-4):(1-5):(1-4). In the preparation method of the composite material, the glass fiber is divided into three parts and added to the twin-screw extruder, and the three parts of glass fiber are added to the front, middle and rear sections of the twin-screw extruder, which can make the fiber gradually enter the system in different shear strength sections, on the one hand, to avoid the formation of "bridges" in the screw section when added at one time, resulting in poor conveying or even blocking, on the other hand, the three-part addition can also make the fiber mix more smoothly with the matrix resin, ensuring the stability of extrusion. The mass ratio of the three parts of glass fiber is not particularly limited and can be adjusted according to actual conditions, for example, the mass ratio of the glass fiber added to the front, middle and rear sections of the twin-screw extruder includes but is not limited to front:middle:rear=3:4:3, etc.

[0023] In the steps S1 and S2, the temperatures of the front section, the middle section and the rear section of the double screw extruder can be selected according to actual conditions. In the specific preparation process, the temperatures of the front section, the middle section and the rear section of the double screw extruder are usually different. The front section is a feeding section or a conveying section, generally low-temperature preheating is adopted to preliminarily preheat the material, so as to avoid caking or bridging of the cold material when entering the high-temperature zone due to too large temperature difference. The middle section is generally a melting or plasticizing section, generally high-temperature melting is adopted to provide sufficient heat to completely melt the material from solid state. The rear section is generally a homogenizing and metering section, the temperature is stable, and the material is required to be maintained in a molten state to ensure stable flowability of the material and avoid uneven extrusion due to temperature fluctuation. The temperatures of the front section, the middle section and the rear section of the double screw extruder, for example, include but are not limited to: the temperature of the front section of the double screw extruder is 275-285℃, the temperature of the middle section is 290-300℃, and the temperature of the rear section is 300-310℃.

[0024] Finally, the application also provides the application of the composite material as described above in the electrolytic cell frame and accessories. The composite material as described above has high thermal conductivity and good mechanical properties, and is particularly suitable for industrial parts (such as electrolytic cell pole frame) that require lightweight and thermal management optimization. The electrolytic cell frame or accessory prepared from the composite material can quickly respond to shorten the cold start time of pure water or low-concentration alkaline electrolytic cell in a low-temperature state, and ensure the uniformity of the material temperature during application to avoid the influence of thermal stress on the durability of the material. At the same time, the poly carbonate toughening phase filled composite material has stable and reliable mechanical strength, which can ensure the long-term stable use of the frame.

[0025] The composite material of the application adds polycarbonate to polyphenylene sulfide (PPS) to achieve the effect of toughening and improving mechanical strength, and simultaneously adds a specific amount of hexagonal boron nitride and glass fiber to modify polyphenylene sulfide through a synergistic mechanism, which significantly improves the thermal conductivity of the composite material, so that the composite material has the advantages of high thermal conductivity and good mechanical properties. The preparation method of the composite material of the application not only has simple process steps and required equipment, but also can maximize the mechanical properties and thermal conductivity of the composite material. The application of the composite material in the electrolytic cell frame and accessories not only provides a new material selection for the preparation of the electrolytic cell frame and accessories, but also enables the prepared electrolytic cell frame and accessories to quickly respond to shorten the cold start time of pure water or low-concentration alkaline electrolytic cell in a low-temperature state, ensure the uniformity of the material temperature during application to avoid the influence of thermal stress on the durability of the material, have stable and reliable mechanical strength, ensure the long-term stable use of the frame, and meet the demand of lightweight and thermal management optimization. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1A structural schematic diagram of the composite material prepared according to the present application as a cell frame.

[0027] Figure 2 A curve diagram of surface temperature of the cell frame prepared from the composite material according to Example 2-3 and Comparative Example 1-2 versus time.

[0028] Figure 3 A curve diagram of tensile strength and notched impact strength of the cell frame prepared from the composite material according to Example 2-3 and Comparative Example 1-2. DETAILED DESCRIPTION

[0029] In order to better illustrate the purpose, technical scheme and advantages of the present application, the present application will be further described below in combination with the drawings and specific examples.

[0030] The sources of the raw materials used in the following examples are described as follows:

[0031] Polyphenylene sulfide (PPS): purchased from Bori Plastics Co., Ltd., brand: W203A;

[0032] Polycarbonate: purchased from Covestro (China) Co., Ltd., brand:

[0033] Hexagonal boron nitride-1: purchased from Baoding Boda New Material Technology Co., Ltd.; brand: HBN-10; diameter: 5 μm;

[0034] Hexagonal boron nitride-2: purchased from Baoding Boda New Material Technology Co., Ltd.; brand: HBN-40; diameter: 35 μm;

[0035] Glass fiber-1: purchased from Taishan Glass Fiber Co., Ltd.; brand: T443R; length: 3 mm; diameter, 10 μm;

[0036] Glass fiber-2: purchased from Taishan Glass Fiber Co., Ltd.; brand: length: 18 mm; diameter: 18.5 μm.

[0037] The polyphenylene sulfide, polycarbonate, hexagonal boron nitride and glass fiber are dried to constant weight at 80℃ before use. Other raw materials are conventional materials in the art unless otherwise specified.

[0038] Example 1

[0039] In one embodiment of the composite material of the present application, the preparation raw materials of the composite material according to the present embodiment include the following components in parts by weight: polyphenylene sulfide 30 parts, polycarbonate 25.5 parts, hexagonal boron nitride-1 20 parts, glass fiber-1 20 parts, compatibilizer 3 parts, dispersant 1.4 parts, antioxidant 0.1 part.

[0040] The compatibilizer in the embodiment is styrene-ethylene-butylene-styrene block copolymer, the dispersant is styrene-acrylate copolymer, and the antioxidant is 4,4'-bis(α,α-dimethylbenzyl) diphenylamine.

[0041] The preparation method of the composite material in the embodiment comprises the following steps:

[0042] S1, uniformly mix the remaining preparation raw materials except polycarbonate and glass fiber, melt blend in a double screw extruder, the main screw rotation speed of the double screw extruder is 80 rpm, and the feeding screw rotation speed is 30 rpm; the front section temperature of the double screw extruder is 280℃, the middle section temperature is 300℃, and the rear section temperature is 310℃, extrusion granulation to obtain an intermediate mixture;

[0043] S2, melt blend polycarbonate and glass fiber with the intermediate mixture obtained in step S1 in a double screw extruder, the main screw rotation speed of the double screw extruder is 80 rpm, and the feeding screw rotation speed is 30 rpm; the front section temperature of the double screw extruder is 275℃, the middle section temperature is 290℃, and the rear section temperature is 300℃, extrusion granulation to obtain the composite material.

[0044] Embodiment 2

[0045] In an embodiment of the composite material, the preparation raw materials of the composite material in the embodiment comprise the following components by weight: polyphenylene sulfide 24.5 parts, polycarbonate 25.5 parts, hexagonal boron nitride-1 40 parts, glass fiber-1 5 parts, compatibilizer 2 parts, dispersant 2.8 parts, and antioxidant 0.2 parts.

[0046] In the embodiment, the compatibilizer is glycerol stearate, the dispersant is polyarylene ether sulfone oligomer, and the antioxidant is tetra(2,4-di-tert-butylphenol)-4,4'-diphenyl diphosphite.

[0047] The preparation method of the composite material in the embodiment comprises the following steps:

[0048] S1, uniformly mix the remaining preparation raw materials except polycarbonate and glass fiber, melt blend in a double screw extruder, the main screw rotation speed of the double screw extruder is 80 rpm, and the feeding screw rotation speed is 30 rpm; the front section temperature of the double screw extruder is 280℃, the middle section temperature is 300℃, and the rear section temperature is 310℃, extrusion granulation to obtain an intermediate mixture;

[0049] S2, melt blend polycarbonate and glass fiber with the intermediate mixture obtained in step S1 in a twin-screw extruder, the main screw rotation speed of the twin-screw extruder is 80 rpm, the feeding screw rotation speed is 30 rpm; the front section temperature of the twin-screw extruder is 275℃, the middle section temperature is 295℃, the rear section temperature is 300℃, and the extrusion granulation is performed, thereby obtaining the composite material.

[0050] Example 3

[0051] In an embodiment of the composite material, the preparation raw materials of the composite material in the embodiment include the following components in parts by weight: polyphenylene sulfide 21.5 parts, polycarbonate 18.5 parts, hexagonal boron nitride-1 40 parts, glass fiber-1 15 parts, compatibilizer 2 parts, dispersant 2.8 parts, and antioxidant 0.2 parts.

[0052] In the embodiment, the compatibilizer is maleic anhydride grafted polyethylene, the dispersant is trifluoropropylmethyl polysiloxane, and the antioxidant is 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene.

[0053] The preparation method of the composite material in the embodiment includes the following steps:

[0054] S1, mix the remaining preparation raw materials except polycarbonate and glass fiber uniformly, and melt blend in a twin-screw extruder, the main screw rotation speed of the twin-screw extruder is 80 rpm, and the feeding screw rotation speed is 30 rpm; the front section temperature of the twin-screw extruder is 285℃, the middle section temperature is 300℃, and the rear section temperature is 310℃, and the extrusion granulation is performed, thereby obtaining an intermediate mixture;

[0055] S2, melt blend polycarbonate and glass fiber with the intermediate mixture obtained in step S1 in a twin-screw extruder, the main screw rotation speed of the twin-screw extruder is 80 rpm, the feeding screw rotation speed is 30 rpm; the front section temperature of the twin-screw extruder is 280℃, the middle section temperature is 300℃, the rear section temperature is 310℃, and the extrusion granulation is performed, thereby obtaining the composite material.

[0056] Examples 4-9

[0057] The preparation raw materials of the composite material in Examples 4-9 of the composite material are shown in Table 1.

[0058] Table 1: Preparation raw material composition of composite materials in Examples 1-9

[0059]

[0060] Note: In Table 1, the addition amount of each raw material component in the preparation raw materials of each example is parts by weight.

[0061] The selection of the compatibilizer, dispersant, and antioxidant and the preparation method of the composite material in Examples 4-9 are the same as those in Example 2.

[0062] Comparative Examples 1-6

[0063] The raw material composition for preparing the composite material of Comparative Examples 1-6 of the composite material of the present application is shown in Table 2.

[0064] Table 2 Raw material composition for preparing the composite material of Comparative Examples 1-6

[0065] Ingredient Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Polyphenylene sulfide 100 24.5 24.5 40 40 40 Polycarbonate 0 25.5 25.5 30 30 30 Hexagonal boron nitride-1 0 45 0 10 23 6 Glass fiber-1 0 0 45 17 4 21 Compatibilizer 0 2 2 1.9 1.9 1.9 Dispersant 0 2.8 2.8 1 1 1 Antioxidant 0 0.2 0.2 0.1 0.1 0.1

[0066] Note: In the raw materials for preparing the composite material of Comparative Examples 1-6 in Table 2, the addition amount of each raw material component is parts by weight.

[0067] The selection of the compatibilizer, dispersant, and antioxidant and the preparation method of the composite material in Comparative Examples 2-6 are the same as those in Example 2. Comparative Example 1 is a PPS material, which can be directly extruded and granulated.

[0068] Example 1

[0069] The composite materials prepared in Examples 1-9 and Comparative Examples 1-6 above were respectively placed in a forced air drying oven and dried at 80°C until constant weight, and then injection molded into test pieces using an injection molding machine, with the injection molding pressure of the injection molding machine set to 30-80 MPa, the screw rotation speed set to 90 rpm, the cooling time set to 10 s, and the mold temperature set to 140°C. The temperature of each section of the injection molding machine is shown in Table 3.

[0070] Table 3 Temperature of each section of the injection molding machine

[0071] Region Tail end Middle Front end Nozzle Temperature / °C 280-310 290-320 310-330 300-330

[0072] The test pieces prepared by injection molding in Examples 1-9 and Comparative Examples 1-6 had the same appearance and structure, as shown in the photographs in Figure 1

[0073] The test pieces prepared in Examples 1-9 and Comparative Examples 1-6 were placed at room temperature for 24 h and then subjected to tensile strength, notched impact strength, and temperature rise tests, with the test methods as follows:

[0074] Tensile strength: tested according to the method of GB / T 1040.1-2018 “Determination of tensile properties of plastics - Part 1: General principles”.

[0075] Notched impact strength: tested according to the method of GB / T 1043.1-2008 “Determination of Izod Charpy impact properties of plastics - Part 1: Non-instrumented impact test”. ​

[0076] Thermal conductivity: The thermal conductivity of the sample was tested according to the transient plane source method using a thermal conductivity tester. The sample size was 15 mm x 15 mm x 3 mm. During the test, the system parameters of the thermal conductivity tester were set differently according to the thermal conductivity of the sample. For samples with high thermal conductivity, higher output power and shorter test time and sampling time were selected.

[0077] Temperature rise test: The sample with a size of 15 mm x 15 mm x 3 mm was placed on a pre-set temperature constant temperature heating table for heating for 90 s. At the same time, the temperature distribution and thermal imaging of the sample surface were observed using an infrared thermal imager, and the change of the surface temperature of the sample with time was recorded.

[0078] The test results of the test pieces of Examples 1-9 and Comparative Examples 1-6 are shown in Table 4 below, respectively.

[0079] Table 4 Test results of test pieces prepared from composite materials of examples and comparative examples

[0080] Group Thermal conductivity W / (m·K) Tensile strength (MPa) Notched Charpy Impact Strength kJ / m 2 ]] Example 1 1.35 37 2.95 Example 2 1.73 32 3.22 Example 3 2.05 42 2.76 Example 4 1.25 35 2.63 Example 5 1.12 39 2.78 Example 6 1.62 34 2.52 Example 7 2.25 30 3.09 Example 8 1.65 29 2.58 Example 9 1.57 28 1.82 Comparative Example 1 0.23 40 2.39 Comparative Example 2 1.53 25 1.13 Comparative Example 3 0.53 165 8.32 Comparative Example 4 0.88 41 3.42 Comparative Example 5 1.25 32 2.43 Comparative Example 6 0.65 43 3.54

[0081] The curves of the change of the surface temperature with time in the temperature rise test of the electrolytic cell frame prepared from the composite materials of Examples 2-3 and Comparative Examples 1-2 are shown in FIG. 2. Figure 2

[0082] The change curves of the tensile strength and the notched impact strength of the composite materials of Examples 2-3 and Comparative Examples 1-2 are shown in FIG. 3. Figure 3

[0083] From the above Table 4 and FIGS. 2 and 3, it can be seen that compared with the comparative examples, the composite materials of the examples have obvious improvements in thermal conductivity and mechanical properties. Figure 2 3 From the comparison of Example 2 with Examples 8-9, it can be seen that the size of hexagonal boron nitride and glass fiber has a direct impact on the thermal conductivity and mechanical properties of the prepared composite materials, especially on the notched impact strength of the composite materials.

[0084] From the comparison of the results of Example 2 with Comparative Examples 2-3, it can be seen that the combination of glass fiber and hexagonal boron nitride can significantly improve the comprehensive properties of the composite materials such as thermal conductivity and mechanical properties. The composite material of Comparative Example 2 lacks glass fiber, and compared with Example 2, its thermal conductivity and mechanical properties have obvious decreases. In Comparative Example 3, the lack of hexagonal boron nitride causes the mechanical properties to be good, but the thermal conductivity is significantly decreased.

[0085] From the comparison of the results of Example 2 with Comparative Examples 2-3, it can be seen that the combination of glass fiber and hexagonal boron nitride can significantly improve the comprehensive properties of the composite materials such as thermal conductivity and mechanical properties. The composite material of Comparative Example 2 lacks glass fiber, and compared with Example 2, its thermal conductivity and mechanical properties have obvious decreases. In Comparative Example 3, the lack of hexagonal boron nitride causes the mechanical properties to be good, but the thermal conductivity is significantly decreased.

[0086] ​​​It can be seen from the comparison of the results of Example 5 and Comparative Example 4 that the glass fiber and the hexagonal boron nitride need to be combined in a certain ratio to significantly improve the comprehensive performance of the composite material. Only when both are added to the composite preparation raw material system in a suitable ratio, the prepared composite material can have the advantages of high thermal conductivity and good mechanical properties.

[0087] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A composite material, characterized by, The preparation raw material of the composite material comprises the following ingredients in parts by weight: 25-60 parts of polyphenylene sulfide, 10-30 parts of polycarbonate, 15-45 parts of hexagonal boron nitride, 5-20 parts of glass fiber, 0.5-3 parts of compatibilizer, 1-5 parts of dispersant, and 0.1-0.5 parts of antioxidant. The mass percentage of the hexagonal boron nitride in the preparation raw material of the composite material is 15-45%. The mass percentage of the glass fiber in the preparation raw material of the composite material is 5-20%.

2. The composite material of claim 1, wherein, The particle diameter of the hexagonal boron nitride is 5-20 μm.

3. The composite material of claim 1, wherein, The length of the glass fiber is 1-5 mm, and the diameter is 10-20 μm.

4. The composite material of claim 1, wherein, The compatibilizer comprises at least one of glycerol stearate, styrene-ethylene-butylene-styrene block copolymer, and maleic anhydride grafted polyethylene; The dispersant comprises at least one of polyarylene ether sulfone oligomer, styrene-acrylate copolymer, and trifluoropropylmethyl polysiloxane. The antioxidant comprises at least one of tetrakis(2,4-di-tert-butylphenyl)-4,4'-diphenyl diphosphite, 4,4'-bis(α,α-dimethylbenzyl) diphenylamine, and 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl) benzene.

5. The composite material of claim 1, wherein, The preparation raw material of the composite material further comprises 0-3 parts by weight of an auxiliary, and the auxiliary comprises at least one of lubricant, plasticizer, release agent, and pigment.

6. A method of producing a composite material as claimed in any one of claims 1 to 5, characterised in that, The preparation method comprises the following steps: S1, uniformly mixing the remaining preparation raw materials except polycarbonate and glass fiber, adding them into a twin-screw extruder for melt blending, extruding and granulating to obtain an intermediate mixture; S2, adding polycarbonate and glass fiber into the intermediate mixture obtained in step S1 into the twin-screw extruder for melt blending, extruding and granulating to obtain the composite material.

7. The method of claim 6, wherein the composite material is prepared by a process comprising: The rotational speed of the main screw of the twin-screw extruder in steps S1 and S2 is 75-95 rpm, and the rotational speed of the feeding screw is 25-40 rpm.

8. The method of claim 6, wherein the composite material is prepared by a process comprising: In step S2, the glass fiber is added into the front section, middle section and rear section of the twin-screw extruder in three portions, and the mass ratio of the glass fiber added into the front section, middle section and rear section is: front section: middle section: rear section = (1-4):(1-5):(1-4).

9. The method for preparing the composite material as described in claim 6 or 8, characterized in that, The temperature of the front section of the twin-screw extruder is 275-285℃, the temperature of the middle section is 290-300℃, and the temperature of the rear section is 300-310℃.

10. The composite material according to any one of claims 1-5 for use in the frame of an electrolytic cell and accessories.

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