CN114806020A - High-foaming-ratio conductive polypropylene composite material and preparation method thereof - Google Patents
High-foaming-ratio conductive polypropylene composite material and preparation method thereof Download PDFInfo
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
- C08J9/008—Nanoparticles
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- C08J2203/00—Foams characterized by the expanding agent
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
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- C08J2400/00—Characterised by the use of unspecified polymers
- C08J2400/10—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08J2400/104—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
- C08J2400/105—Polymers characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms containing carboxyl groups
Abstract
The invention provides a high-foaming-rate conductive polypropylene composite material and a preparation method thereof, relating to the field of supercritical fluid foaming; the primary product of the composite material comprises, by weight, 60-85 parts of high-melt polypropylene, 3-5 parts of a compatilizer, 2-4 parts of carbon nanotubes, 8-20 parts of conductive carbon black, 1-2 parts of a polycarboxylic acid water reducing agent, 1-2 parts of silica fume, 0.5-2 parts of a lubricant, 0.5-1.5 parts of an antioxidant and 0.2-0.5 part of a nucleating agent; the method adopts a supercritical fluid foaming process to foam a primary product; according to the invention, the carbon nano tube and the conductive carbon black are compounded to be used as the conductive filler of the polypropylene composite material, and meanwhile, the polycarboxylic acid water reducing agent is used for grafting the surface of the carbon nano tube and then mixing and stirring the carbon nano tube with the silica fume, so that the problem of uneven dispersion of the conductive filler can be effectively solved, the conductive performance of the polypropylene composite material is further improved, and the foaming performance of the product is also improved; the finally prepared product has smaller bubble size, finer bubble and larger foaming ratio.
Description
Technical Field
The invention relates to the technical field of supercritical fluid foaming, in particular to a high-foaming-ratio conductive polypropylene composite material and a preparation method thereof.
Background
In recent years, with the increase of energy crisis, researchers at home and abroad uniformly consider lightweight materials as an important approach for solving the energy crisis. The microcellular foam material is used as a most intuitive light product and is widely applied to the fields of aviation industry, agriculture, automobile industry, electronic and electric appliances, packaging industry and the like. The microcellular foamed materials not only reduce weight but also have excellent physical and mechanical properties such as good dimensional stability, processability, mechanical properties and thermal properties. Microcellular foam materials are mainly classified into physical foam materials and chemical foam materials according to the type of the foaming agent. The chemical foaming material is difficult to completely degrade to cause residue, and environmental pollution is easily caused. Compared with chemical foaming, physical foaming is realized by directly introducing supercritical fluid of gases such as nitrogen, carbon dioxide and the like, then uniformly mixing with polymer melt, and then foaming in a pressure reduction mode, so that the problem of chemical residue in chemical foaming can be well solved by physical foaming.
With the wide use of microcellular foaming materials such as foamed polypropylene and the like, the functional application requirements of the microcellular foaming materials are more and more, and the traditional common foamed polypropylene is difficult to meet the performance requirements of some applications, such as heat-conducting foamed polypropylene, electric-conducting foamed polypropylene and the like. In the prior art, patent application CN 108586939a discloses an environment-friendly flame-retardant conductive polypropylene material, which is prepared from the following raw materials in percentage by weight: 100-150 parts of polypropylene resin, 1-5 parts of carbon nano tube, 5-10 parts of flame retardant, 1-3 parts of compatilizer, 0.5-2 parts of antioxidant and 3-5 parts of lubricant. The conductive polypropylene material is prepared by simply blending and extruding all components, and no solution is provided for the problems of uneven dispersion and high cost which are possibly caused by the simple use of the carbon nano tube. Patent application CN 107522942a discloses a conductive polypropylene microcellular foam material, which is prepared from the following raw materials in percentage by weight: 10-100 parts of first polypropylene resin, 100 parts of second polypropylene resin, 5-15 parts of conductive filler and 0.1-1 part of dispersing agent, wherein the conductive filler is carbon black or/and a mixture of metal powder and carbon nano tubes. The material takes carbon black or/and metal powder and carbon nano tubes as conductive fillers, and solves the problem of high cost to a certain extent; however, the conductive polypropylene material is prepared by simply blending and extruding the components, and no solution is provided for the problems of nonuniform dispersion caused by the use of carbon nano tubes, nonuniform foam holes of a foamed product and collapse of the foam holes.
Disclosure of Invention
The invention aims to provide a high-foaming-ratio conductive polypropylene composite material and a preparation method thereof, wherein the high-foaming-ratio conductive polypropylene composite material is prepared by special blending modified polypropylene resin and adopting a supercritical fluid technology, has good conductivity, high, uniform and fine foam cell density and excellent mechanical property, and meets market requirements; the technical problems of uneven dispersion of conductive materials, nonuniform foam holes, collapse of the foam holes and the like in the high-foaming-ratio conductive polypropylene composite material in the prior art are fully solved.
In order to achieve the above purpose, the invention provides the following technical scheme: a high-foaming-ratio conductive polypropylene composite material comprises the following components in parts by weight:
further, the compatilizer is one or more of EPDM-g-MAH, EPDM-g-GMA, PP-g-MAH, PP-g-GMA, PE-g-MAH, PE-g-GMA, POE-g-MAH, POE-g-GMA, EMA-g-MAH, EBA-g-GMA, EBA-g-MAH, SEBS-g-MAH and styrene-maleic anhydride copolymer.
Further, the carbon nanotube is an array tube, and the shape of the array tube is compressed particles.
Further, the average particle size of the conductive carbon black is 20-40 nm.
Further, the polycarboxylate superplasticizer is obtained by graft copolymerization and has a dendritic structure.
Further, the lubricant is one or more of stearate, EBS and PE wax.
Further, the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 1076 and antioxidant 1790.
Further, the nucleating agent is sorbitol or aryl phosphate.
The invention also provides a preparation method of the high-foaming-ratio conductive polypropylene composite material, which comprises the following steps:
(1) weighing and uniformly mixing the components according to the weight part ratio, wherein the components comprise 60-85 parts of high-melting polypropylene, 3-5 parts of compatilizer, 2-4 parts of carbon nano tube, 8-20 parts of conductive carbon black, 1-2 parts of polycarboxylic acid water reducer, 1-2 parts of silica fume, 0.5-2 parts of lubricant, 0.5-1.5 parts of antioxidant and 0.2-0.5 part of nucleating agent;
(2) adding the uniformly mixed components into a double-screw extruder, and carrying out melt blending, extrusion granulation and drying treatment to obtain a primary product;
(3) and (3) extruding the primary product by a single screw to prepare a plate, putting the plate into a mould pressing die, and preparing the high-foaming-ratio conductive polypropylene composite material by adopting an in-mould supercritical fluid foaming process.
Wherein the screw rotating speed of the double-screw extruder is 400-500r/min, and the preparation process temperature of each zone is as follows: the first region is 150-.
Further, the specific parameters of the in-mold supercritical fluid foaming process adopted in the step (3) are as follows: the temperature in the mold is 140-156 ℃, the pressure of fluid in the mold is 8-12 MPa, the time of constant temperature and pressure in the mold is 30-120 min, and the speed of releasing pressure to normal pressure in the mold is 1-20 MPa/s.
According to the technical scheme, the technical scheme of the invention has the following beneficial effects:
1. on one hand, the high-foaming-ratio conductive polypropylene material prepared by the invention adopts the compounding of the carbon nano tube and the conductive carbon black as the conductive filler of the polypropylene composite material, so that the cost of the conductive filler can be effectively reduced; on the other hand, the polycarboxylic acid water reducing agent is used for grafting the surface of the carbon nano tube, and then the silicon ash is used for mixing and stirring, so that the dispersibility of the conductive filler can be effectively improved; the conductive filler has good dispersibility, the prepared high-foaming-ratio conductive polypropylene material has a more uniform and stable structure, more uniform and fine product cells, high cell density and low cell opening phenomenon. According to the invention, the high-foaming-rate conductive polypropylene composite material is prepared by foaming through a supercritical fluid technology, so that the problem of uneven dispersion of conductive filler in the conductive polypropylene material in the prior art is effectively solved, and the product has excellent and stable conductivity, low material cost and excellent mechanical property;
2. the principle that the carbon nano tube and the conductive carbon black are compounded to be used as the conductive filler and the dispersity of the conductive filler is improved by adding the polycarboxylic acid water reducing agent and the silica fume in the scheme of the invention is as follows: during the process of mixing and stirring the materials, the polycarboxylate superplasticizer preferentially reacts with functional groups on the surfaces of the carbon nanotubes and wraps the surfaces of the carbon nanotubes, so that gaps are generated between the adjacent carbon nanotubes; meanwhile, under the condition that the mixed materials are continuously stirred, the spherical silica fume can be filled into gaps among the carbon nano tubes, so that the effect of improving the dispersity among the carbon nano tubes in the materials is achieved; based on the principle, the invention effectively reduces the agglomeration phenomenon of the carbon nano tubes in the primary product of the polypropylene composite material, ensures the uniformity of the foam holes of the finally prepared high-foaming conductive polypropylene composite material and improves the conductivity.
3. The high-foaming-ratio conductive polypropylene material prepared by the invention fully meets the continuously improved performance requirements of the current domestic and foreign industries on the conductive foaming material.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a microscopic image of a cell electron microscope of example 1 of the present invention;
fig. 2 is a diagram illustrating a dispersion mechanism of the conductive filler according to the present invention.
In the figure, the specific meaning of each mark is:
1-carbon nano tube, 2-polycarboxylic acid water reducing agent and 3-silica fume.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Similarly, the singular forms "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or the like, mean that the elements or items listed before "comprises" or "comprising" encompass the features, integers, steps, operations, elements, and/or components listed after "comprising" or "comprising," and do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object to be described is changed, the relative positional relationships may also be changed accordingly.
Based on the scheme that the conductive polypropylene material is prepared by simply blending and extruding all components for preparing the polypropylene composite material in the prior art, the problem that the prepared foamed product has poor conductive effect, nonuniform foam holes and collapse due to the phenomenon of nonuniform dispersion of carbon nanotubes of the conductive material exists; the invention aims to solve the problems and provides a high-foaming-ratio conductive polypropylene composite material and a preparation method thereof.
Specifically, the high-foaming-ratio conductive polypropylene composite material comprises, by weight, 60-85 parts of high-melt polypropylene, 3-5 parts of a compatilizer, 2-4 parts of a carbon nanotube 1, 8-20 parts of conductive carbon black, 1-2 parts of a polycarboxylic acid water reducing agent 2, 1-2 parts of silica fume 3, 0.5-2 parts of a lubricant, 0.5-1.5 parts of an antioxidant and 0.2-0.5 part of a nucleating agent; wherein the compatilizer is one or more of EPDM-g-MAH, EPDM-g-GMA, PP-g-MAH, PP-g-GMA, PE-g-MAH, PE-g-GMA, POE-g-MAH, POE-g-GMA, EMA-g-MAH, EBA-g-GMA, EBA-g-MAH, SEBS-g-MAH and styrene-maleic anhydride copolymer, and POE-g-MAH is preferable in specific implementation; the carbon nano tube 1 is an array tube, and the shape of the array tube is compressed particles; the average particle size of the conductive carbon black is 20-40 nm; the polycarboxylate superplasticizer 2 is obtained by graft copolymerization and has a dendritic structure; the lubricant is one or more of stearate, EBS and PE wax; the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 1076 and antioxidant 1790; the nucleating agent is sorbitol or aryl phosphate.
The preparation method of the high-foaming-ratio conductive polypropylene composite material comprises the following steps: (1) weighing the components in parts by weight and then uniformly mixing; (2) adding the uniformly mixed components into a double-screw extruder, and carrying out melt blending, extrusion granulation and drying treatment to obtain a primary product; (3) extruding the primary product by a single screw to prepare a plate, putting the plate into a mould pressing die, and preparing the high-foaming-ratio conductive polypropylene composite material by adopting an in-mould supercritical fluid foaming process; wherein, the screw rotating speed of the double-screw extruder in the step (2) is 400-500r/min, and the preparation process temperature of each zone is as follows: the first zone is 150-180 ℃, the second zone is 150-180 ℃, the third zone is 160-190 ℃, the fourth zone is 170-200 ℃, the fifth zone is 180-210 ℃, the sixth zone is 180-210 ℃, the seventh zone is 180-210 ℃, the eighth zone is 190-220 ℃, and the ninth zone is 190-230 ℃; the specific parameters of the in-mold supercritical fluid foaming process adopted in the step (3) are as follows: the temperature in the mold is 140-156 ℃, the pressure of fluid in the mold is 8-12 MPa, the time of constant temperature and pressure in the mold is 30-120 min, and the speed of releasing pressure to normal pressure in the mold is 1-20 MPa/s.
As an optional implementation mode, the die pressing die in the step (3) is designed with an internal gas circulating device, and the internal gas circulating device has good sealing performance and can resist high pressure of more than 15 MPa.
The high foaming ratio conductive polypropylene composite material and the preparation method thereof disclosed by the invention are further specifically described below with reference to the accompanying drawings and specific examples.
According to the preparation method of the high-foaming-ratio conductive polypropylene composite material, the following examples 1-4 and comparative examples 1-2 are provided, wherein the examples and comparative examples are obtained by specifically adjusting the weight parts of the components in the formula of the primary product, and the processing conditions are consistent; the specific process is as follows: blending all the ingredients in a low-speed stirrer for 20 minutes, adding the mixture into a double-screw extruder, setting the temperatures of a zone 1 to a zone 9 of the extruder to be 150 ℃, 170 ℃, 180 ℃, 200 ℃, 210 ℃ and 230 ℃, respectively, and carrying out melt plasticization, kneading and mixing, extrusion, cooling, grain cutting and drying on the mixed material to obtain a primary product; extruding the primary product into a plate by a single-screw extruder, wherein the temperatures of an extrusion temperature zone 1 to an extrusion temperature zone 9 of the extruder are respectively set to be 150 ℃, 200 ℃, 210 ℃, 220 ℃ and 230 ℃ to obtain the plate; placing the plate in a mould press, controlling the temperature of the mould press to be 152 ℃, controlling the pressure of supercritical fluid carbon dioxide injected into the mould to be 10MPa, keeping the temperature and the pressure in the mould constant for 40 minutes, and then releasing the pressure to the normal pressure at the speed of 10MPa/s to obtain the conductive polypropylene composite material with the high foaming ratio, wherein the specific primary product formula is shown in the following table 1.
TABLE 1 composition ratios of primary products obtained in examples 1-4 and comparative examples 1-2
| Ingredients/examples | Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 | Example 4 |
| High melt PP | 80.9 | 68.9 | 79.9 | 78.9 | 72.9 | 67.9 |
| Compatilizer | 4 | 4 | 4 | 4 | 4 | 4 |
| Carbon nanotube | 3 | 3 | 3 | 3 | 2 | 2 |
| Conductive carbon black | 8 | 20 | 8 | 8 | 15 | 20 |
| Polycarboxylic acid water reducing agent | 0 | 0 | 1 | 2 | 1 | 1 |
| |
2 | 2 | 2 | 2 | 2 | 2 |
| Antioxidant agent | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| |
1 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Nucleating agent | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
Foaming the primary products prepared in the above-mentioned ratio in examples 1-4 and comparative examples 1-2 by a supercritical fluid foaming process, wherein the supercritical fluid can be one of carbon dioxide, nitrogen, pentane, butane or heptane, preferably carbon dioxide; the finally prepared high-expansion-ratio conductive polypropylene composite material of each product is detected according to the detection method shown in the following table 2, wherein the detection method comprises the detection of the density, the hardness, the cell size and the surface resistivity of the foaming material, and the result is shown in the following table 2.
TABLE 2 Performance data of the conductive polypropylene composites prepared in examples 1-4 and comparative examples 1-2
| Detecting items | Detection method | Unit of | Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 | Example 4 |
| Density of | ISO1183 | g/cm 3 | 70 | 85 | 30 | 35 | 55 | 62 |
| Hardness of | GB/T 531.2 | O | 60 | 70 | 35 | 40 | 50 | 58 |
| Cell size | SEM | μm | 115 | 131 | 90 | 95 | 102 | 106 |
| Surface resistivity | IEC 60093 | Ω.cm | 9.2*10 4 | 1.8*10 4 | 2.3*10 3 | 2.2*10 3 | 1.0*10 4 | 9.1*10 3 |
As can be seen from the test results between examples 1 to 4 and comparative examples 1 and 2 in the table above, the polypropylene composite materials obtained in examples 1 to 4 have smaller surface resistivity than comparative examples 1 and 2, which indicates that the problem of agglomeration of the carbon nanotube 1 in the composite polypropylene composite material can be effectively solved by adding the polycarboxylic acid water reducing agent 2 and the silica fume 3 in the materials, so that the electrical conductivity of the composite material is improved; by combining a cell electron microscope image of a product in example 1 shown in fig. 1, a primary product of a polycarboxylate superplasticizer 2 and silica fume 3 is added into a formula, so that the foaming effect is better, and the prepared high-foaming-ratio conductive polypropylene composite material has relatively smaller cell size and finer cells; the reason is that, in comparative examples 1 and 2 in which the polycarboxylic acid water reducing agent 2 was not added, the carbon nanotubes 1 and the conductive carbon black as the conductive components could not be effectively dispersed, forming an agglomeration phenomenon, resulting in poor foaming effect, large cell size and low foaming ratio.
With reference to fig. 2, the specific dispersion mechanism of adding the polycarboxylate superplasticizer 2 and the silica fume 3 to promote effective dispersion of the conductive component is as follows: in the process of mixing and stirring the materials, the polycarboxylate superplasticizer 2 preferentially reacts with functional groups on the surface of the carbon nano tube 1 and wraps the surface of the carbon nano tube 1, so that gaps are generated between the adjacent carbon nano tubes 1; meanwhile, under the condition that the mixed materials are continuously stirred, the spherical silica fume 3 can be filled into gaps among the carbon nano tubes 1, so that the effect of improving the dispersibility among the carbon nano tubes 1 in the materials is achieved.
The performance data of the embodiment 1 and the embodiment 2 are combined to find that the foaming performance of the material is affected by the proportion of the polycarboxylate superplasticizer 2 in the formula, the excessive polycarboxylate superplasticizer 2 can cause the foaming performance of the prepared high-foaming-ratio conductive polypropylene material to be relatively reduced, and the conductive filler is fully dispersed, so that the conductive filler has little influence on the conductive performance; combining the performance data of example 1, example 3 and example 4, it is found that by adjusting the composition of the conductive filler, for example, by decreasing the weight part of the carbon nanotube 1 and increasing the weight part of the conductive carbon black 2, as in example 3 and example 4, the foaming performance of the prepared conductive polypropylene material is significantly decreased, the cell size is significantly increased, and the conductivity is decreased; the reason is that the polycarboxylic acid water reducing agent 2 and the silica fume 3 can not fully disperse the conductive carbon black, and the conductive carbon black is obviously agglomerated, so that the excellent conductive performance and foaming performance of the material are not favorably obtained.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. The high-foaming-ratio conductive polypropylene composite material is characterized by comprising the following components in parts by weight:
2. the high expansion ratio conductive polypropylene composite material according to claim 1, wherein the compatibilizer is one or more of EPDM-g-MAH, EPDM-g-GMA, PP-g-MAH, PP-g-GMA, PE-g-MAH, PE-g-GMA, POE-g-MAH, POE-g-GMA, EMA-g-MAH, EBA-g-GMA, EBA-g-MAH, SEBS-g-MAH, and styrene-maleic anhydride copolymer.
3. The high expansion ratio conductive polypropylene composite material according to claim 1, wherein the carbon nanotubes are in the form of array tubes, and the array tubes are in the form of compressed particles.
4. The high expansion ratio conductive polypropylene composite material according to claim 1, wherein the conductive carbon black has an average particle diameter of 20 to 40 nm.
5. The high-expansion-ratio conductive polypropylene composite material according to claim 1, wherein the polycarboxylic acid water reducer is obtained by graft copolymerization and has a dendritic structure.
6. The high expansion ratio conductive polypropylene composite material according to claim 1, wherein the lubricant is one or more compounds selected from stearate, EBS and PE wax.
7. The high expansion ratio conductive polypropylene composite material according to claim 1, wherein the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 1076 and antioxidant 1790.
8. The high expansion ratio conductive polypropylene composite material according to claim 1, wherein the nucleating agent is sorbitol or aryl phosphate.
9. A preparation method of a high-foaming-ratio conductive polypropylene composite material is characterized by comprising the following steps:
(1) weighing and uniformly mixing the components according to the weight part ratio, wherein the components comprise 60-85 parts of high-melting polypropylene, 3-5 parts of compatilizer, 2-4 parts of carbon nano tube, 8-20 parts of conductive carbon black, 1-2 parts of polycarboxylic acid water reducer, 1-2 parts of silica fume, 0.5-2 parts of lubricant, 0.5-1.5 parts of antioxidant and 0.2-0.5 part of nucleating agent;
(2) adding the uniformly mixed components into a double-screw extruder, and carrying out melt blending, extrusion granulation and drying treatment to obtain a primary product;
(3) and (3) extruding the primary product by a single screw to prepare a plate, putting the plate into a mould pressing die, and preparing the high-foaming-ratio conductive polypropylene composite material by adopting an in-mould supercritical fluid foaming process.
Wherein the screw rotating speed of the double-screw extruder is 400-500r/min, and the preparation process temperature of each zone is as follows: the first region is 150-.
10. The method for preparing the conductive polypropylene composite material with high foaming ratio according to claim 9, wherein the specific parameters of the in-mold supercritical fluid foaming process adopted in the step (3) are as follows: the temperature in the mold is 140-156 ℃, the pressure of fluid in the mold is 8-12 MPa, the time of constant temperature and pressure in the mold is 30-120 min, and the speed of releasing pressure to normal pressure in the mold is 1-20 MPa/s.
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| CN202210613287.XA CN114806020A (en) | 2022-05-31 | 2022-05-31 | High-foaming-ratio conductive polypropylene composite material and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107522942A (en) * | 2017-08-04 | 2017-12-29 | 浙江新恒泰新材料有限公司 | A kind of conducting polypropylene microcellular foam material and its production method |
| CN112851269A (en) * | 2021-03-18 | 2021-05-28 | 湖南加美乐素新材料股份有限公司 | Reinforced anti-crack cement-based grouting material and preparation method thereof |
| CN114249918A (en) * | 2022-01-12 | 2022-03-29 | 深圳烯湾科技有限公司 | Antistatic polypropylene foam material, preparation method thereof and semiconductor packaging material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107522942A (en) * | 2017-08-04 | 2017-12-29 | 浙江新恒泰新材料有限公司 | A kind of conducting polypropylene microcellular foam material and its production method |
| CN112851269A (en) * | 2021-03-18 | 2021-05-28 | 湖南加美乐素新材料股份有限公司 | Reinforced anti-crack cement-based grouting material and preparation method thereof |
| CN114249918A (en) * | 2022-01-12 | 2022-03-29 | 深圳烯湾科技有限公司 | Antistatic polypropylene foam material, preparation method thereof and semiconductor packaging material |
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