CN112552604B - Heat-conducting and insulating polypropylene composite material and preparation method and application thereof - Google Patents
Heat-conducting and insulating polypropylene composite material and preparation method and application thereof Download PDFInfo
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Abstract
A heat-conducting insulating polypropylene composite material and a preparation method and application thereof relate to a heat-conducting insulating material and a preparation method and application thereof. The invention aims to solve the problems of high filler consumption, poor heat conduction and insulation, complex preparation process and unsuitability for large-scale industrial production of the existing polypropylene composite material. A heat-conducting insulating polypropylene composite material is prepared from polypropylene, a component A, a component B, a component C, an antioxidant and a lubricant; the method comprises the following steps: firstly, weighing; secondly, mixing; and thirdly, extruding and granulating to obtain the heat-conducting and insulating polypropylene composite material. The heat-conducting and insulating polypropylene composite material prepared by the invention has the vertical thermal conductivity of 0.8-1.2W/(m.K) and the plane thermal conductivity of 1.5-3.4W/(m.K). A heat-conducting insulating polypropylene composite material is used as a heat-conducting insulating material in the fields of electric wires and cables, automobiles, electric and electronic products or energy sources.
Description
Technical Field
The invention relates to a heat-conducting insulating material and a preparation method and application thereof.
Background
The polymer material is widely applied to the fields of electrical insulation, microelectronic packaging, automobiles, energy sources and the like. At present, two main methods for improving the thermal conductivity of polymer materials are as follows: one is to form an intrinsic heat-conducting polymer material by using polymerization reaction, but the preparation process is complex and the cost is high; and the other is to introduce a filler with excellent heat-conducting property, such as metal oxide, nitride, metal, carbon material and the like, and the method has the advantages of relatively simple process, low cost and easy large-scale industrial production.
The polypropylene is one of the most widely used general plastics due to its excellent mechanical properties, electrical properties, high temperature resistance, corrosion resistance, wear resistance, safety, non-toxicity and other advantages, and its modified material and product are considered as one of the development directions of light-weight, universal and cyclic new materials. However, the polypropylene material has a low thermal conductivity, so that its application in the rapidly developing and emerging field is limited, and especially when the polypropylene material meets the thermal management requirements brought by high precision, high integration, high power and high density of electrical and electronic components and devices, a certain technical bottleneck still exists in the polypropylene material having certain mechanical properties, electrical properties and thermal conductivity.
CN109467813A proposes a preparation method of a heat-conducting polypropylene material, which adopts the synergistic effect of modified polypropylene, copper, a modified porous inorganic material and modified titanium dioxide to endow the heat-conducting polypropylene material with excellent heat-conducting property. CN110564059A proposes a high thermal conductivity polypropylene composite material and a preparation method thereof, and graphite, graphite flakes and chopped carbon fibers are adopted as thermal conductive fillers to obtain excellent thermal conductivity under high filling amount. CN103232638B proposes an insulating and heat-conducting polypropylene composition for LED lamps and a preparation method thereof, wherein zinc oxide, magnesium oxide, barium sulfate, magnesium hydroxide and boron nitride are adopted as heat-conducting agents, the insulating property and the heat-conducting property of the composite material are good, but the heat-conducting coefficient is only about 0.7W/(m.K).
As can be seen from the above analysis, the prior art has the following disadvantages: firstly, the addition of metal and carbon materials can change the electric conduction characteristics of the composite material, and is not suitable for the development of heat-conducting insulating materials; secondly, in order to obtain the composite material with certain heat-conducting property, the dosage of the heat-conducting filler is higher, and the influence on the performance of the composite material is serious; thirdly, the design of heat conduction materials is lacked, and the components are not matched sufficiently; fourthly, the process is complex and is not suitable for large-scale industrial production.
Disclosure of Invention
The invention aims to solve the problems of high filler consumption, poor heat conduction and insulation, complex preparation process and unsuitability for large-scale industrial production of the existing polypropylene composite material, and provides a heat conduction and insulation polypropylene composite material and a preparation method and application thereof.
The heat-conducting and insulating polypropylene composite material is prepared from 10 to 70 parts by weight of polypropylene, 5 to 20 parts by weight of component A, 20 to 55 parts by weight of component B, 5 to 20 parts by weight of component C, 0.2 to 2 parts by weight of antioxidant and 0.2 to 2 parts by weight of lubricant;
the component A is prepared from 80 to 95 parts by weight of polypropylene, 5 to 20 parts by weight of inorganic nano particles, 0.2 to 2 parts by weight of silane coupling agent and 0.1 to 1 part by weight of nucleating agent;
the component B is prepared from 50 to 80 parts by weight of hexagonal boron nitride, 20 to 50 parts by weight of heat-conducting filler, 1 to 10 parts by weight of intercalating agent, 1 to 10 parts by weight of polymethyl silane and 0.2 to 5 parts by weight of silane coupling agent;
the component C is prepared from 50 to 80 parts by weight of graft modified resin and 20 to 50 parts by weight of titanate coupling agent modified inorganic whisker.
A preparation method of a heat-conducting and insulating polypropylene composite material comprises the following steps:
weighing 10-70 parts of polypropylene, 5-20 parts of component A, 20-55 parts of component B, 5-20 parts of component C, 0.2-2 parts of antioxidant and 0.2-2 parts of lubricant according to parts by weight;
secondly, adding 20 to 55 parts of the component B, 0.2 to 2 parts of antioxidant and 0.2 to 2 parts of lubricant weighed in the step one into a high-speed mixer, mixing for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, then adding 5 to 20 parts of the component A and 5 to 20 parts of the component C, continuing to mix for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, then adding 10 to 70 parts of polypropylene, continuing to mix for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, and obtaining a mixture;
and thirdly, melting, extruding and granulating the mixture at 170-230 ℃ by adopting a double-screw extruder to obtain the heat-conducting and insulating polypropylene composite material.
A heat-conducting insulating polypropylene composite material is used as a heat-conducting insulating material in the fields of electric wires and cables, automobiles, electric and electronic products or energy sources.
The principle of the invention is as follows:
the composite material is based on structural design and component optimization of a composite material, three functional components are formed, wherein one of the three functional components is that metal oxide and nitride with insulation characteristics are adopted as heat-conducting fillers, an intercalation agent is introduced between boron nitride layers by utilizing the characteristics of a hexagonal boron nitride two-dimensional structure, so that the boron nitride layers are promoted to be stripped and dispersed, the boron nitride layers and other heat-conducting fillers are compounded to play a synergistic effect, and a heat-conducting structure is formed by virtue of the reactivity of polymethyl silane;
the invention adopts the mixing of the nano particles and the organic nucleating agent to form an inorganic-organic compound nucleating system and a nano particle reinforcing and toughening system, solves the subsequent dispersion problem by means of modification, and is beneficial to improving the crystallization of polypropylene and the heat conductivity;
the invention uses the combination of the graft modified resin and the crystal whisker to improve the compatibility and enhance the toughness, and promotes the boron nitride to form an oriented structure by means of the orientation of the crystal whisker in the extrusion process to improve the heat-conducting property;
the invention provides a new idea, the preparation method is easy to operate and process, is suitable for industrial production, has important application significance in the aspects of realizing the heat conductivity, the mechanical property, the electrical property and the processing property of the polymer-based composite material, and can meet the processing and application requirements in the fields of wires and cables, automobiles, electrical electronics, energy sources and the like.
The invention has the beneficial effects that:
firstly, oxides and nitrides with insulating properties are used as heat conducting fillers, and a heat conducting network is constructed by utilizing zero-dimensional nano particles, one-dimensional whiskers, two-dimensional nano sheets and three-dimensional particles, so that the heat conducting property of the composite material is effectively improved, and the insulating property of the composite material is maintained;
secondly, the composition of inorganic nano particles and an organic nucleating agent is adopted to promote the crystallization and grain refinement of polypropylene, form a heat-conducting particle continuous distribution structure, reduce the using amount of a heat-conducting filler and improve the mechanical property and the processing property;
thirdly, the compatibility of the inorganic material and polypropylene is improved by adopting the graft modified resin, and the mechanical property of the composite material can be improved while the thermal conductivity is obtained by utilizing the reinforcing and toughening effects of the nano particles and the whiskers;
fourthly, the surface modification technology and the group chemical reaction are utilized, the bridging effect of the coupling agent is combined with the active effect of the polymethylsilane, the dispersibility of the inorganic material is improved, and the important effect is achieved on the improvement of the comprehensive performance;
fifth, adopt the common industrial equipment, simple technological process, the operability is strong, suitable for the large-scale industrial production.
Sixthly, the vertical thermal conductivity of the heat-conducting and insulating polypropylene composite material prepared by the invention is 0.83-1.2W/(m.K), the plane thermal conductivity is 1.5-3.4W/(m.K), and the volume resistivity is 1.4 multiplied by 1011～1.4×1012Ω·m。
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit of the invention.
The first embodiment is as follows: the heat-conducting and insulating polypropylene composite material is prepared from 10-70 parts by weight of polypropylene, 5-20 parts by weight of component A, 20-55 parts by weight of component B, 5-20 parts by weight of component C, 0.2-2 parts by weight of antioxidant and 0.2-2 parts by weight of lubricant;
the component A is prepared from 80 to 95 parts by weight of polypropylene, 5 to 20 parts by weight of inorganic nano particles, 0.2 to 2 parts by weight of silane coupling agent and 0.1 to 1 part by weight of nucleating agent;
the component B is prepared from 50-80 parts by weight of hexagonal boron nitride, 20-50 parts by weight of heat-conducting filler, 1-10 parts by weight of intercalator, 1-10 parts by weight of polymethylsilane and 0.2-5 parts by weight of silane coupling agent;
the component C is prepared from 50 to 80 parts by weight of graft modified resin and 20 to 50 parts by weight of titanate coupling agent modified inorganic whisker.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the melt flow rate of 2.16kg of the polypropylene is 0.5g/10 min-100 g/10min at 230 ℃; the polypropylene is one or a mixture of more of homopolymerized polypropylene and copolymerized polypropylene. The other steps are the same as those in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the preparation method of the component A is completed according to the following steps:
weighing 80-95 parts of polypropylene, 5-20 parts of inorganic nanoparticles, 0.2-2 parts of silane coupling agent and 0.1-1 part of nucleating agent according to parts by weight;
under the condition of 230 ℃, the melt flow rate of 2.16kg of the polypropylene in the step I is 5g/10 min-50 g/10 min;
the inorganic nano particles in the step I are one or a mixture of more of silicon oxide, titanium oxide, magnesium oxide and aluminum oxide; the particle size of the inorganic nano particles is 10 nm-100 nm;
the silane coupling agent in the step I is one or a mixture of more of epoxy silane coupling agent and amino silane coupling agent;
the epoxy silane coupling agent is one or a mixture of more of gamma-glycidoxypropyltrimethoxysilane, gamma-glycidoxypropyltriethoxysilane, gamma-glycidoxypropylmethyldimethoxysilane and gamma-glycidoxypropylmethyldiethoxysilane;
the aminosilane coupling agent is one or a mixture of more of gamma-aminopropylmethyldimethoxysilane, gamma-aminopropylmethyldiethoxysilane, gamma-aminopropyltrimethoxysilane and gamma-aminopropyltriethoxysilane;
the nucleating agent in the step I is one or a mixture of more of a sorbitol nucleating agent, an organic phosphate nucleating agent and an organic metal salt nucleating agent;
secondly, adding 0.2 to 2 parts of silane coupling agent weighed in the step I into absolute ethyl alcohol to be uniformly mixed, then adding 0.1 to 1 part of nucleating agent, and processing for 10 to 30 seconds by adopting a homogenizing dispersion machine under the condition that the rotating speed is 5000 to 20000r/min to obtain a mixed solution;
the volume ratio of the silane coupling agent to the absolute ethyl alcohol in the step II is 1 (5-50);
thirdly, adding 5 to 20 parts of the inorganic nano particles weighed in the step I into a high-speed mixer, adding the mixed solution obtained in the step II under the condition that the rotating speed is 500 to 1500r/min, stirring for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min, adding 80 to 95 parts of polypropylene, and continuously stirring for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min to obtain a mixture;
and fourthly, melting, extruding and granulating the mixture at the temperature of between 170 and 210 ℃ by adopting a double-screw extruder to obtain the component A. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is as follows: the preparation method of the component B is completed according to the following steps:
weighing 50-80 parts of hexagonal boron nitride, 20-50 parts of heat-conducting filler, 1-10 parts of intercalation agent, 1-10 parts of polymethyl silane and 0.2-5 parts of silane coupling agent according to parts by weight to prepare the material;
the grain diameter of the hexagonal boron nitride in the step I is 1-20 mu m;
the grain diameter of the heat-conducting filler in the step I is 1-50 mu m;
the heat-conducting filler in the step I is one or a mixture of more of aluminum oxide, magnesium oxide and aluminum nitride;
the intercalation agent in the step I is one or a mixture of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, hydroxyl silicone oil and vinyl silicone oil;
the polymerization degree of the polymethylsilane in the step I is 50-500;
the silane coupling agent in the step I is a vinyl silane coupling agent; the vinyl silane coupling agent is one or a mixture of more of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri (beta-methoxyethoxy) silane and vinyl tri-tert-butoxy silane;
adding 20 to 50 parts of the heat-conducting filler weighed in the step I into a high-speed mixer, adding 0.2 to 5 parts of silane coupling agent under the condition that the rotating speed is 500 to 1500r/min, mixing for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min, adding 1 to 10 parts of polymethylsilane, and continuously mixing for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min to obtain a mixture; placing the mixture in an oven with the temperature of 60-120 ℃ for heat treatment for 2-8 h to obtain the modified heat-conducting filler;
thirdly, 50 to 80 parts of hexagonal boron nitride and absolute ethyl alcohol are weighed in the step I and mixed, then the mixture is put into a ball mill for ball milling for 0.5 to 2 hours, 1 to 10 parts of intercalation agent is added, the ball milling is continued for 1 to 6 hours, then the modified heat-conducting filler is added, the ball milling is continued for 1 to 6 hours, a mixture is obtained, the mixture is placed in an oven with the temperature of 60 to 120 ℃ for heat treatment for 2 to 8 hours, and the modified composite filler is obtained;
the mass ratio of the hexagonal boron nitride to the absolute ethyl alcohol in the step (iii) is 1 (5-50);
the ball milling speed in the third step is 100 r/min-500 r/min;
and fourthly, putting the modified composite filler into a high-speed mixer, and mixing for 1-5 min under the condition that the rotating speed is 500-1500 r/min to obtain the component B. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the preparation method of the component C is completed according to the following steps:
weighing 50-80 parts of graft modified resin and 20-50 parts of titanate coupling agent modified inorganic crystal whisker according to parts by weight;
the grafting modified resin in the step I is one or a mixture of more of maleic anhydride grafted polyethylene, maleic anhydride grafted polyolefin elastomer and maleic anhydride grafted ethylene-vinyl acetate copolymer, wherein the grafting rate of maleic anhydride is 0.2-2.0%;
the titanate coupling agent modified inorganic whisker in the step I is prepared by the following steps: adding the inorganic crystal whisker into a high-speed mixer, adding a titanate coupling agent under the condition that the rotating speed is 100 r/min-500 r/min, and continuously mixing for 1 min-5 min under the condition that the rotating speed is 100 r/min-500 r/min to obtain the titanate coupling agent modified inorganic crystal whisker; the inorganic crystal whisker is one or a mixture of several of zinc oxide crystal whisker, calcium sulfate crystal whisker, magnesium borate crystal whisker and calcium carbonate crystal whisker, the diameter of the inorganic crystal whisker is 0.5-5 mu m, and the length of the inorganic crystal whisker is 10-100 mu m; the titanate coupling agent is one or a mixture of more of isopropyl tri (isostearyl) titanate, isopropyl tri (dioctyl pyrophosphoryl) titanate, di (dioctyl pyrophosphoryl) oxoacetate titanium, isopropyl di (methacryloyl) isostearyl titanate, isopropyl tri (dodecyl benzenesulfonyl) titanate and isopropyl tri (n-ethylamino) titanate; the mass ratio of the titanate coupling agent to the inorganic crystal whisker is (0.2-5): 100;
adding 50 to 80 parts of graft modified resin and 20 to 50 parts of titanate coupling agent modified inorganic whiskers weighed in the step I into a high-speed mixer, and stirring for 1 to 5 minutes under the condition of 100 to 500r/min to obtain a mixture;
thirdly, the mixture is melted and extruded for granulation at 140-180 ℃ by adopting a double-screw extruder to obtain the component C. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is as follows: the antioxidant consists of 0.1 to 5 weight parts of main antioxidant, 0 to 3 weight parts of auxiliary antioxidant and 0 to 2 weight parts of metal passivator; the main antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the auxiliary antioxidant is one or a mixture of more of tris (2, 4-di-tert-butylphenyl) phosphite, n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate and dilauryl thiodipropionate; the metal passivator is 1, 2-bis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and the first to sixth embodiments is: the lubricant is one or a mixture of more of polyethylene wax, silicone oil, stearate, white oil and paraffin oil. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the heat-conducting and insulating polypropylene composite material is prepared from 12 to 43 parts by weight of polypropylene, 11 to 16 parts by weight of component A, 40 to 53 parts by weight of component B, 18 to 20 parts by weight of component C, 1 to 2 parts by weight of antioxidant and 1.1 to 2 parts by weight of lubricant. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the embodiment is a preparation method of a heat-conducting and insulating polypropylene composite material, which comprises the following steps:
weighing 10-70 parts of polypropylene, 5-20 parts of component A, 20-55 parts of component B, 5-20 parts of component C, 0.2-2 parts of antioxidant and 0.2-2 parts of lubricant according to parts by weight;
secondly, adding 20 to 55 parts of the component B, 0.2 to 2 parts of antioxidant and 0.2 to 2 parts of lubricant weighed in the step one into a high-speed mixer, mixing for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, then adding 5 to 20 parts of the component A and 5 to 20 parts of the component C, continuing to mix for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, then adding 10 to 70 parts of polypropylene, continuing to mix for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, and obtaining a mixture;
and thirdly, melting, extruding and granulating the mixture at 170-230 ℃ by adopting a double-screw extruder to obtain the heat-conducting and insulating polypropylene composite material.
The specific implementation mode is ten: the embodiment is that the heat-conducting and insulating polypropylene composite material is used as a heat-conducting and insulating material in the fields of electric wires and cables, automobiles, electric and electronic products or energy sources.
Example 1: the heat-conducting insulating polypropylene composite material is prepared from the following raw materials in parts by weight: 43 percent of polypropylene, 11.15 percent of component A, 34.5 percent of component B, 10.05 percent of component C, 0.8 percent of antioxidant and 0.5 percent of lubricant;
the polypropylene consists of homopolymerized polypropylene and copolymerized polypropylene, and the mass ratio of the homopolymerized polypropylene to the copolymerized polypropylene is 18: 25; wherein the melt flow rate of 2.16kg of the homopolymerized polypropylene is 3g/10min at the temperature of 230 ℃; the melt flow rate of 2.16kg of the copolymerized polypropylene is 5g/10min at 230 ℃;
the antioxidant consists of 0.4 part of main antioxidant, 0.2 part of auxiliary antioxidant and 0.2 part of metal passivator in parts by weight; the main antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the auxiliary antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite; the metal passivator is 1, 2-bis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine;
the lubricant consists of polyethylene wax and calcium stearate, wherein the mass ratio of the polyethylene wax to the calcium stearate is 3: 2;
the preparation method of the component A is completed according to the following steps:
89.69 parts of polypropylene, 8.97 parts of inorganic nanoparticles, 0.45 part of silane coupling agent and 0.90 part of nucleating agent are weighed according to parts by weight;
the polypropylene in the step I is homopolymerized polypropylene, and the melt flow rate of 2.16kg is 5g/10min at the temperature of 230 ℃;
the inorganic nano particles in the step I are silicon oxide, and the particle size is 20 nm;
the silane coupling agent gamma-glycidoxypropyltrimethoxysilane of the step I;
the nucleating agent in the step I is a polypropylene beta nucleating agent WBG-II which is purchased from Guangdong Weilinnan new materials science and technology Co., Ltd;
adding 0.45 part of silane coupling agent weighed in the step I into absolute ethyl alcohol, uniformly mixing, adding 0.90 part of nucleating agent, and processing for 10s by adopting a homogenizing dispersion machine under the condition that the rotating speed is 10000r/min to obtain a mixed solution;
the volume ratio of the silane coupling agent to the absolute ethyl alcohol in the step II is 1: 10;
thirdly, adding 8.97 parts of the inorganic nano particles weighed in the step I into a high-speed mixer, adding the mixed solution obtained in the step II under the condition that the rotating speed is 1000r/min, stirring for 2min under the condition that the rotating speed is 1000r/min, adding 89.69 parts of polypropylene, and continuously stirring for 2min under the condition of 1000r/min to obtain a mixture;
melting, extruding and granulating the mixture at 190 ℃ by adopting a double-screw extruder to obtain a component A;
the preparation method of the component B is completed according to the following steps:
46.38 parts of hexagonal boron nitride, 46.37 parts of heat-conducting filler, 1.45 parts of intercalator, 2.9 parts of polymethyl silane and 2.9 parts of silane coupling agent are weighed according to parts by weight to prepare the composite material;
the grain diameter of the hexagonal boron nitride in the step I is 2 mu m;
the grain diameter of the heat-conducting filler in the step I is 5 mu m;
the heat-conducting filler in the step I is aluminum oxide and magnesium oxide, wherein the mass ratio of the aluminum oxide to the magnesium oxide is 40.57: 5.8;
the intercalation agent in the step I is sodium dodecyl benzene sulfonate;
the polymerization degree of the polymethylsilane in the step (I) is 200;
the silane coupling agent in the step I is vinyl trimethoxy silane;
adding 46.37 parts of the heat-conducting filler weighed in the step I into a high-speed mixer, adding 2.9 parts of silane coupling agent under the condition of the rotating speed of 1500r/min, mixing for 5min under the condition of the rotating speed of 1500r/min, adding 2.9 parts of polymethylsilane, and continuously mixing for 3min under the condition of the rotating speed of 1500r/min to obtain a mixture; placing the mixture in an oven with the temperature of 80 ℃ for heat treatment for 2h to obtain the modified heat-conducting filler;
thirdly, 46.38 parts of hexagonal boron nitride and absolute ethyl alcohol are weighed in the step I and mixed, then the mixture is put into a ball mill for ball milling for 1 hour, 1.45 parts of intercalation agent is added, the ball milling is continued for 4 hours, then the modified heat-conducting filler is added, the ball milling is continued for 2 hours, a mixture is obtained, and the mixture is placed in an oven with the temperature of 80 ℃ for heat treatment for 2 hours, so that the modified composite filler is obtained;
the mass ratio of the hexagonal boron nitride to the absolute ethyl alcohol in the step (c) is 1: 10;
the ball milling speed in the third step is 400 r/min;
fourthly, the modified composite filler is put into a high-speed mixer and mixed for 1min under the condition that the rotating speed is 1500r/min, and the component B is obtained;
the preparation method of the component C is completed according to the following steps:
weighing 69.65 parts of graft modified resin and 30.35 parts of titanate coupling agent modified inorganic crystal whisker according to the parts by weight;
the grafting modified resin in the step I is maleic anhydride grafted polyethylene, wherein the grafting rate of maleic anhydride is 1%;
the titanate coupling agent modified inorganic whisker in the step I is prepared by the following steps: adding the inorganic crystal whisker into a high-speed mixer, adding a titanate coupling agent under the condition that the rotating speed is 500r/min, and continuously mixing for 4min under the condition that the rotating speed is 500r/min to obtain the titanate coupling agent modified inorganic crystal whisker; the inorganic crystal whisker is calcium carbonate crystal whisker; the diameter of the inorganic crystal whisker is 2 μm, and the length of the inorganic crystal whisker is 20 μm; the titanate coupling agent is isopropyl tri (dodecyl benzene sulfonyl) titanate; the mass ratio of the titanate coupling agent to the inorganic whisker is 0.5: 29.85;
adding 69.65 parts of graft modified resin and 30.35 parts of titanate coupling agent modified inorganic whisker weighed in the step I into a high-speed mixer, and stirring for 4min at the speed of 500r/min to obtain a mixture;
thirdly, melting, extruding and granulating the mixture at 160 ℃ by adopting a double-screw extruder to obtain a component C;
the preparation method of the heat-conducting and insulating polypropylene composite material comprises the following steps:
the raw materials by mass portion are as follows: 43 percent of polypropylene, 11.15 percent of component A, 34.5 percent of component B, 10.05 percent of component C, 0.8 percent of antioxidant and 0.5 percent of lubricant, wherein the polypropylene, the component A, the component B, the component C, the antioxidant and the lubricant are weighed;
adding the component B, the antioxidant and the lubricant weighed in the step one into a high-speed mixer, mixing for 3min at the rotating speed of 1500r/min, then adding the component A and the component C, continuing mixing for 2min at the rotating speed of 1500r/min, then adding polypropylene, and continuing mixing for 2min at the rotating speed of 1500r/min to obtain a mixture;
and thirdly, melting, extruding and granulating the mixture at 200 ℃ by adopting a double-screw extruder to obtain the heat-conducting and insulating polypropylene composite material.
Example 2: the heat-conducting insulating polypropylene composite material is prepared from the following raw materials in parts by mass: 31% of polypropylene, 10.15% of component A, 46.5% of component B, 11.05% of component C, 0.8% of antioxidant and 0.5% of lubricant;
the polypropylene consists of homopolymerized polypropylene and copolymerized polypropylene, and the mass ratio of the homopolymerized polypropylene to the copolymerized polypropylene is 16: 15; wherein the melt flow rate of 2.16kg of the homopolymerized polypropylene is 5g/10min at the temperature of 230 ℃; the melt flow rate of 2.16kg of the copolymerized polypropylene is 3g/10min at 230 ℃;
the antioxidant consists of 0.4 part of main antioxidant, 0.2 part of auxiliary antioxidant and 0.2 part of metal passivator in parts by weight; the main antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the auxiliary antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite; the metal passivator is 1, 2-bis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine;
the lubricant consists of polyethylene wax and silicone, wherein the ratio of the polyethylene wax to the silicone is 3: 2;
the preparation method of the component A is completed according to the following steps:
weighing 78.82 parts of polypropylene, 19.70 parts of inorganic nanoparticles, 0.99 part of silane coupling agent and 0.49 part of nucleating agent in parts by weight;
under the condition of 230 ℃, the melt flow rate of the polypropylene in the step I is 5g/10min at 2.16 kg;
the inorganic nano particles in the step I are magnesium oxide; the particle size of the inorganic nano particles is 50 nm;
the silane coupling agent in the step I is gamma-glycidyl ether oxypropyl methyldimethoxysilane;
the nucleating agent in the step I is a nucleating transparent agent ZC-3 which is purchased from a smoke desk Chu New Material Co., Ltd;
adding 0.99 part of silane coupling agent weighed in the step I into absolute ethyl alcohol, uniformly mixing, adding 0.49 part of nucleating agent, and processing for 10s by adopting a homogenizing dispersion machine under the condition that the rotating speed is 10000r/min to obtain a mixed solution;
the volume ratio of the silane coupling agent to the absolute ethyl alcohol in the step II is 1: 10;
thirdly, adding 19.70 parts of the inorganic nano particles weighed in the step I into a high-speed mixer, adding the mixed solution obtained in the step II under the condition that the rotating speed is 500-1500 r/min, stirring for 3min under the condition that the rotating speed is 1000r/min, adding 78.82 parts of polypropylene, and continuously stirring for 2min under the condition of 1000r/min to obtain a mixture;
melting, extruding and granulating the mixture at 190 ℃ by adopting a double-screw extruder to obtain a component A;
the preparation method of the component B is completed according to the following steps:
weighing 53.76 parts of hexagonal boron nitride, 36.56 parts of heat-conducting filler, 1.08 parts of intercalating agent, 4.3 parts of polymethyl silane and 4.3 parts of silane coupling agent according to parts by weight;
the grain diameter of the hexagonal boron nitride in the step I is 5 mu m;
the grain diameter of the heat-conducting filler in the step I is 10 mu m;
the heat-conducting filler in the step I is composed of aluminum oxide and aluminum nitride, wherein the mass ratio of the aluminum oxide to the aluminum nitride is 32.26: 4.3;
the intercalation agent in the step I is hydroxyl silicone oil;
the polymerization degree of the polymethylsilane in the step (I) is 100;
the silane coupling agent in the step I is vinyl triethoxysilane;
adding 36.56 parts of the heat-conducting filler weighed in the step I into a high-speed mixer, adding 4.3 parts of silane coupling agent under the condition of the rotating speed of 1500r/min, mixing for 2min under the condition of the rotating speed of 1500r/min, then adding 4.3 parts of polymethylsilane, and continuously mixing for 4min under the condition of the rotating speed of 1500r/min to obtain a mixture; placing the mixture in an oven with the temperature of 80 ℃ for heat treatment for 4h to obtain the modified heat-conducting filler;
thirdly, weighing 53.76 parts of hexagonal boron nitride and absolute ethyl alcohol in the step I, mixing, putting into a ball mill, performing ball milling for 2 hours, adding 1.08 parts of an intercalation agent, performing ball milling for 6 hours, adding a modified heat-conducting filler, performing ball milling for 2 hours to obtain a mixture, and placing the mixture in an oven at the temperature of 80 ℃ for heat treatment for 2 hours to obtain a modified composite filler;
the mass ratio of the hexagonal boron nitride to the absolute ethyl alcohol in the step (c) is 1: 10;
the ball milling speed in the third step is 500 r/min;
fourthly, the modified composite filler is put into a high-speed mixer and mixed for 2min under the condition that the rotating speed is 1500r/min, and the component B is obtained;
the preparation method of the component C is completed according to the following steps:
weighing 54.3 parts of graft modified resin and 45.7 parts of titanate coupling agent modified inorganic crystal whisker according to the parts by weight;
the grafting modified resin in the step I is maleic anhydride grafted polyolefin elastomer, wherein the grafting rate of maleic anhydride is 1.0%;
the titanate coupling agent modified inorganic whisker in the step I is prepared by the following steps: adding the inorganic crystal whisker into a high-speed mixer, adding a titanate coupling agent under the condition that the rotating speed is 100 r/min-500 r/min, and continuously mixing for 1 min-5 min under the condition that the rotating speed is 100 r/min-500 r/min to obtain the titanate coupling agent modified inorganic crystal whisker; the inorganic crystal whisker is calcium sulfate crystal whisker, the diameter of the inorganic crystal whisker is 1 μm, and the length of the inorganic crystal whisker is 10 μm; the titanate coupling agent is isopropyl tri (dioctyl pyrophosphoryl) titanate; the mass ratio of the titanate coupling agent to the inorganic whisker is 0.45: 45.25;
adding 54.3 parts of graft modified resin and 45.7 parts of titanate coupling agent modified inorganic whisker weighed in the step I into a high-speed mixer, and stirring for 4min at the speed of 500r/min to obtain a mixture;
thirdly, melting, extruding and granulating the mixture at 160 ℃ by adopting a double-screw extruder to obtain a component C;
the preparation method of the heat-conducting and insulating polypropylene composite material comprises the following steps:
weighing 10-70 parts of polypropylene, 5-20 parts of component A, 20-55 parts of component B, 5-20 parts of component C, 0.2-2 parts of antioxidant and 0.2-2 parts of lubricant according to parts by weight;
the material composition comprises the following raw materials in parts by mass: 31 percent of polypropylene, 10.15 percent of component A, 46.5 percent of component B, 11.05 percent of component C, 0.8 percent of antioxidant and 0.5 percent of lubricant, wherein the polypropylene, the component A, the component B, the component C, the antioxidant and the lubricant are weighed;
secondly, adding the component B, the antioxidant and the lubricant weighed in the step one into a high-speed mixer, mixing for 3min at the rotating speed of 1500r/min, then adding the component A and the component C, continuing to mix for 2min at the rotating speed of 1500r/min, then adding polypropylene, and continuing to mix for 2min at the rotating speed of 1500r/min to obtain a mixture;
and thirdly, melting, extruding and granulating the mixture at 210 ℃ by using a double-screw extruder to obtain the heat-conducting and insulating polypropylene composite material.
Example 3: the heat-conducting insulating polypropylene composite material is prepared from the following raw materials in parts by mass: 12% of polypropylene, 15.25% of component A, 52.5% of component B, 18.15% of component C, 1.0% of antioxidant and 1.1% of lubricant;
the polypropylene consists of homopolymerized polypropylene and copolymerized polypropylene, and the mass ratio of the homopolymerized polypropylene to the copolymerized polypropylene is 3: 9; wherein the melt flow rate of 2.16kg of the homopolymerized polypropylene is 3g/10min at the temperature of 230 ℃; the melt flow rate of 2.16kg of the copolymerized polypropylene is 5g/10min at 230 ℃;
the antioxidant consists of 0.4 part of main antioxidant, 0.2 part of auxiliary antioxidant and 0.2 part of metal passivator in parts by weight; the main antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the auxiliary antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite; the metal passivator is 1, 2-bis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine;
the lubricant consists of polyethylene wax and silicone, wherein the ratio of the polyethylene wax to the silicone is 3: 2;
the preparation method of the component A is completed according to the following steps:
weighing 78.69 parts of polypropylene, 19.67 parts of inorganic nanoparticles, 1.31 parts of silane coupling agent and 0.33 part of nucleating agent in parts by weight;
under the condition of 230 ℃, the melt flow rate of the polypropylene in the step I is 10g/10min at 2.16 kg;
the inorganic nano particles in the step I are aluminum oxide; the particle size of the inorganic nano particles is 50 nm;
the silane coupling agent in the step I is gamma-aminopropyl triethoxysilane;
the nucleating agent in the step I is a high-efficiency nucleating agent HPN-68L which is purchased from Milliken chemical group Co., Ltd;
adding 1.31 parts of silane coupling agent weighed in the step I into absolute ethyl alcohol, uniformly mixing, adding 0.33 part of nucleating agent, and processing for 20s by adopting a homogenizing dispersion machine under the condition that the rotating speed is 10000r/min to obtain a mixed solution;
the volume ratio of the silane coupling agent to the absolute ethyl alcohol in the step II is 1: 10;
thirdly, adding 19.67 parts of the inorganic nano particles weighed in the step I into a high-speed mixer, adding the mixed solution obtained in the step II under the condition that the rotating speed is 1000r/min, stirring for 3min under the condition that the rotating speed is 1000r/min, adding 78.69 parts of polypropylene, and continuously stirring for 2min under the condition of 1000r/min to obtain a mixture;
melting, extruding and granulating the mixture at 190 ℃ by adopting a double-screw extruder to obtain a component A;
the preparation method of the component B is completed according to the following steps:
47.62 parts of hexagonal boron nitride, 43.81 parts of heat-conducting filler, 0.95 part of intercalating agent, 3.81 parts of polymethyl silane and 3.81 parts of silane coupling agent are weighed according to parts by weight to prepare the material;
the grain diameter of the hexagonal boron nitride in the step I is 10 mu m;
the grain diameter of the heat-conducting filler in the step I is 10 mu m;
the heat-conducting filler in the step I is composed of aluminum oxide and aluminum nitride, wherein the mass ratio of the aluminum oxide to the aluminum nitride is 38.1: 5.71;
the intercalation agent in the step I is vinyl silicone oil;
the polymerization degree of the polymethylsilane in the step (I) is 100;
the silane coupling agent in the step I is vinyl tri (beta-methoxyethoxy) silane;
adding 43.81 parts of the heat-conducting filler weighed in the step I into a high-speed mixer, adding 3.81 parts of silane coupling agent under the condition of the rotating speed of 1500r/min, mixing for 2min under the condition of the rotating speed of 1500r/min, then adding 3.81 parts of polymethylsilane, and continuously mixing for 4min under the condition of the rotating speed of 1500r/min to obtain a mixture; placing the mixture in an oven with the temperature of 80 ℃ for heat treatment for 4h to obtain the modified heat-conducting filler;
thirdly, 47.62 parts of hexagonal boron nitride and absolute ethyl alcohol are weighed in the step I and mixed, then the mixture is put into a ball mill for ball milling for 2 hours, 0.95 part of intercalation agent is added, the ball milling is continued for 6 hours, then the modified heat-conducting filler is added, the ball milling is continued for 2 hours, a mixture is obtained, and the mixture is placed in an oven with the temperature of 80 ℃ for heat treatment for 2 hours, so that the modified composite filler is obtained;
the mass ratio of the hexagonal boron nitride to the absolute ethyl alcohol is 1: 10;
the ball milling speed in the third step is 500 r/min;
fourthly, the modified composite filler is put into a high-speed mixer and mixed for 2min under the condition that the rotating speed is 1500r/min, and the component B is obtained;
the preparation method of the component C is completed according to the following steps:
weighing 55.1 parts of graft modified resin and 44.90 parts of titanate coupling agent modified inorganic crystal whisker according to parts by weight;
the grafting modified resin in the step I is maleic anhydride grafted polyolefin elastomer, wherein the grafting rate of maleic anhydride is 1.0%;
the titanate coupling agent modified inorganic whisker in the step I is prepared by the following steps: adding the inorganic crystal whisker into a high-speed mixer, adding a titanate coupling agent under the condition that the rotating speed is 100 r/min-500 r/min, and continuously mixing for 1 min-5 min under the condition that the rotating speed is 100 r/min-500 r/min to obtain the titanate coupling agent modified inorganic crystal whisker; the inorganic crystal whisker is zinc oxide crystal whisker, the diameter of the inorganic crystal whisker is 2 μm, and the length of the inorganic crystal whisker is 20 μm; the titanate coupling agent is isopropyl tri (isostearoyl) titanate; the mass ratio of the titanate coupling agent to the inorganic whisker is 0.82: 44.08;
adding 55.1 parts of graft modified resin and 44.90 parts of titanate coupling agent modified inorganic whisker weighed in the step I into a high-speed mixer, and stirring for 4min at the speed of 500r/min to obtain a mixture;
thirdly, melting, extruding and granulating the mixture at 160 ℃ by adopting a double-screw extruder to obtain a component C;
the preparation method of the heat-conducting and insulating polypropylene composite material comprises the following steps:
the material composition comprises the following raw materials in parts by mass: 12 percent of polypropylene, 15.25 percent of component A, 52.5 percent of component B, 18.15 percent of component C, 1.0 percent of antioxidant and 1.1 percent of lubricant, wherein the polypropylene, the component A, the component B, the component C, the antioxidant and the lubricant are weighed;
secondly, adding the component B, the antioxidant and the lubricant weighed in the step one into a high-speed mixer, mixing for 3min at the rotating speed of 1500r/min, then adding the component A and the component C, continuing to mix for 2min at the rotating speed of 1500r/min, then adding polypropylene, and continuing to mix for 2min at the rotating speed of 1500r/min to obtain a mixture;
and thirdly, melting, extruding and granulating the mixture at 210 ℃ by adopting a double-screw extruder to obtain the heat-conducting and insulating polypropylene composite material.
The properties of the heat conductive and insulating polypropylene composite materials prepared in examples 1 to 3 are shown in table 1;
TABLE 1
| Examples | Example 1 | Example 2 | Example 3 |
| Vertical thermal conductivity, W/(m. K) | 0.83 | 0.98 | 1.14 |
| Plane thermal conductivity, W/(m. K) | 1.57 | 2.65 | 3.36 |
| Volume resistivity, Ω · m | 1.44×1012 | 7.69×1011 | 1.38×1011 |
The embodiments of the present invention are provided only for illustrating the technical solutions of the present invention and not for limiting the scope of the present invention, and it should be noted that any changes, modifications, substitutions, combinations, simplifications made by those skilled in the art without departing from the spirit and principle of the present invention shall be made as equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A heat-conducting insulating polypropylene composite material is characterized in that the heat-conducting insulating polypropylene composite material is prepared by 10-70 parts of polypropylene, 5-20 parts of component A, 20-55 parts of component B, 5-20 parts of component C, 0.2-2 parts of antioxidant and 0.2-2 parts of lubricant according to parts by weight;
the component A is prepared from 80 to 95 parts by weight of polypropylene, 5 to 20 parts by weight of inorganic nano particles, 0.2 to 2 parts by weight of silane coupling agent and 0.1 to 1 part by weight of nucleating agent;
the component B is prepared from 50-80 parts of hexagonal boron nitride, 20-50 parts of heat-conducting filler, 1-10 parts of intercalation agent, 1-10 parts of polymethyl silane and 0.2-5 parts of silane coupling agent in parts by weight, and the specific preparation method comprises the following steps:
weighing 50-80 parts of hexagonal boron nitride, 20-50 parts of heat-conducting filler, 1-10 parts of intercalation agent, 1-10 parts of polymethyl silane and 0.2-5 parts of silane coupling agent according to parts by weight to prepare the material;
the grain diameter of the hexagonal boron nitride in the step I is 1-20 mu m;
the grain diameter of the heat-conducting filler in the step I is 1-50 mu m;
the heat-conducting filler in the step I is one or a mixture of more of aluminum oxide, magnesium oxide and aluminum nitride;
the intercalation agent in the step I is one or a mixture of more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, hydroxyl silicone oil and vinyl silicone oil;
the polymerization degree of the polymethylsilane in the step I is 50-500;
the silane coupling agent in the step I is a vinyl silane coupling agent; the vinyl silane coupling agent is one or a mixture of more of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri (beta-methoxyethoxy) silane and vinyl tri-tert-butoxy silane;
adding 20 to 50 parts of the heat-conducting filler weighed in the step I into a high-speed mixer, adding 0.2 to 5 parts of silane coupling agent under the condition that the rotating speed is 500 to 1500r/min, mixing for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min, adding 1 to 10 parts of polymethylsilane, and continuously mixing for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min to obtain a mixture; placing the mixture in an oven with the temperature of 60-120 ℃ for heat treatment for 2-8 h to obtain the modified heat-conducting filler;
thirdly, 50 to 80 parts of hexagonal boron nitride and absolute ethyl alcohol are weighed in the step I and mixed, then the mixture is put into a ball mill for ball milling for 0.5 to 2 hours, 1 to 10 parts of intercalation agent is added, the ball milling is continued for 1 to 6 hours, then the modified heat-conducting filler is added, the ball milling is continued for 1 to 6 hours, a mixture is obtained, the mixture is placed in an oven with the temperature of 60 to 120 ℃ for heat treatment for 2 to 8 hours, and the modified composite filler is obtained;
the mass ratio of the hexagonal boron nitride to the absolute ethyl alcohol in the step (iii) is 1 (5-50);
the ball milling speed in the third step is 100 r/min-500 r/min;
fourthly, the modified composite filler is put into a high-speed mixer and mixed for 1min to 5min under the condition that the rotating speed is 500r/min to 1500r/min, and the component B is obtained; the component C is prepared from 50 to 80 parts by weight of graft modified resin and 20 to 50 parts by weight of titanate coupling agent modified inorganic whisker.
2. The heat-conducting and insulating polypropylene composite material as claimed in claim 1, wherein the melt flow rate of 2.16kg of the polypropylene at 230 ℃ is 0.5g/10 min-100 g/10 min; the polypropylene is one or a mixture of more of homopolymerized polypropylene and copolymerized polypropylene.
3. The heat-conducting and insulating polypropylene composite material as claimed in claim 1, wherein the component A is prepared by the following steps:
weighing 80-95 parts of polypropylene, 5-20 parts of inorganic nanoparticles, 0.2-2 parts of silane coupling agent and 0.1-1 part of nucleating agent according to parts by weight;
under the condition of 230 ℃, the melt flow rate of 2.16kg of the polypropylene in the step I is 5g/10 min-50 g/10 min;
the inorganic nano particles in the step I are one or a mixture of more of silicon oxide, titanium oxide, magnesium oxide and aluminum oxide; the particle size of the inorganic nano particles is 10 nm-100 nm;
the silane coupling agent in the step I is one or a mixture of more of epoxy silane coupling agent and amino silane coupling agent;
the epoxy silane coupling agent is one or a mixture of more of gamma-glycidoxypropyltrimethoxysilane, gamma-glycidoxypropyltriethoxysilane, gamma-glycidoxypropylmethyldimethoxysilane and gamma-glycidoxypropylmethyldiethoxysilane;
the aminosilane coupling agent is one or a mixture of more of gamma-aminopropylmethyldimethoxysilane, gamma-aminopropylmethyldiethoxysilane, gamma-aminopropyltrimethoxysilane and gamma-aminopropyltriethoxysilane;
the nucleating agent in the step I is one or a mixture of more of a sorbitol nucleating agent, an organic phosphate nucleating agent and an organic metal salt nucleating agent;
secondly, adding 0.2 to 2 parts of silane coupling agent weighed in the step I into absolute ethyl alcohol to be uniformly mixed, then adding 0.1 to 1 part of nucleating agent, and processing for 10 to 30 seconds by adopting a homogenizing dispersion machine under the condition that the rotating speed is 5000 to 20000r/min to obtain a mixed solution;
the volume ratio of the silane coupling agent to the absolute ethyl alcohol in the step II is 1 (5-50);
thirdly, adding 5 to 20 parts of the inorganic nano particles weighed in the step I into a high-speed mixer, adding the mixed solution obtained in the step II under the condition that the rotating speed is 500 to 1500r/min, stirring for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min, adding 80 to 95 parts of polypropylene, and continuously stirring for 1 to 5min under the condition that the rotating speed is 500 to 1500r/min to obtain a mixture;
and fourthly, melting, extruding and granulating the mixture at the temperature of between 170 and 210 ℃ by adopting a double-screw extruder to obtain the component A.
4. The heat-conducting and insulating polypropylene composite material as claimed in claim 1, wherein the component C is prepared by the following steps:
weighing 50-80 parts of graft modified resin and 20-50 parts of titanate coupling agent modified inorganic crystal whisker according to parts by weight;
the grafting modified resin in the step I is one or a mixture of more of maleic anhydride grafted polyethylene, maleic anhydride grafted polyolefin elastomer and maleic anhydride grafted ethylene-vinyl acetate copolymer, wherein the grafting rate of maleic anhydride is 0.2-2.0%;
the titanate coupling agent modified inorganic whisker in the step I is prepared by the following steps: adding the inorganic crystal whisker into a high-speed mixer, adding a titanate coupling agent under the condition that the rotating speed is 100 r/min-500 r/min, and continuously mixing for 1 min-5 min under the condition that the rotating speed is 100 r/min-500 r/min to obtain the titanate coupling agent modified inorganic crystal whisker; the inorganic crystal whisker is one or a mixture of several of zinc oxide crystal whisker, calcium sulfate crystal whisker, magnesium borate crystal whisker and calcium carbonate crystal whisker, the diameter of the inorganic crystal whisker is 0.5-5 mu m, and the length of the inorganic crystal whisker is 10-100 mu m; the titanate coupling agent is one or a mixture of more of isopropyl tri (isostearyl) titanate, isopropyl tri (dioctyl pyrophosphoryl) titanate, di (dioctyl pyrophosphoryl) oxoacetate titanium, isopropyl di (methacryloyl) isostearyl titanate, isopropyl tri (dodecyl benzenesulfonyl) titanate and isopropyl tri (n-ethylamino) titanate; the mass ratio of the titanate coupling agent to the inorganic crystal whisker is (0.2-5): 100;
adding 50-80 parts of graft modified resin and 20-50 parts of titanate coupling agent modified inorganic whisker weighed in the step I into a high-speed mixer, and stirring for 1-5 min under the condition of 100-500 r/min to obtain a mixture;
thirdly, the mixture is melted and extruded for granulation at 140-180 ℃ by adopting a double-screw extruder to obtain the component C.
5. The heat-conducting insulating polypropylene composite material as claimed in claim 1, wherein the antioxidant comprises, by weight, 0.1 to 5 parts of a primary antioxidant, 0 to 3 parts of a secondary antioxidant, and 0 to 2 parts of a metal deactivator; the main antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the auxiliary antioxidant is one or a mixture of more of tris (2, 4-di-tert-butylphenyl) phosphite, n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate and dilauryl thiodipropionate; the metal passivator is 1, 2-bis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hydrazine.
6. The heat conductive and insulating polypropylene composite material according to claim 1, wherein the lubricant is one or more selected from polyethylene wax, silicone oil, stearate, white oil and paraffin oil.
7. The heat-conducting and insulating polypropylene composite material as claimed in claim 1, wherein the heat-conducting and insulating polypropylene composite material is prepared from 12 to 43 parts by weight of polypropylene, 11 to 16 parts by weight of component A, 40 to 53 parts by weight of component B, 18 to 20 parts by weight of component C, 1 to 2 parts by weight of antioxidant and 1.1 to 2 parts by weight of lubricant.
8. The method for preparing a heat-conducting and insulating polypropylene composite material as claimed in claim 1, wherein the method for preparing the heat-conducting and insulating polypropylene composite material comprises the following steps:
weighing 10-70 parts of polypropylene, 5-20 parts of component A, 20-55 parts of component B, 5-20 parts of component C, 0.2-2 parts of antioxidant and 0.2-2 parts of lubricant according to parts by weight;
secondly, adding 20 to 55 parts of the component B, 0.2 to 2 parts of antioxidant and 0.2 to 2 parts of lubricant weighed in the step one into a high-speed mixer, mixing for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, then adding 5 to 20 parts of the component A and 5 to 20 parts of the component C, continuing to mix for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, then adding 10 to 70 parts of polypropylene, continuing to mix for 1 to 5 minutes under the condition of the rotating speed of 1000 to 1500r/min, and obtaining a mixture;
and thirdly, melting, extruding and granulating the mixture at 170-230 ℃ by adopting a double-screw extruder to obtain the heat-conducting and insulating polypropylene composite material.
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