CN111087693A - Low-density low-dielectric hydrophobic polypropylene composite material and preparation method thereof - Google Patents
Low-density low-dielectric hydrophobic polypropylene composite material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low-density low-dielectric hydrophobic polypropylene composite material and a preparation method thereof. The material disclosed by the invention has the advantages of excellent mechanical property, high contact angle, low glossiness, low density and the like, meets the requirements of different application scenes on stain resistance and matte appearance, meets the requirements of high-quality household products, and meets the related requirements of materials for automotive upholsteries.
Description
Technical Field
The invention belongs to the field of modified plastics, and particularly relates to a low-density low-dielectric hydrophobic polypropylene composite material and a preparation method thereof.
Background
At present, polypropylene (PP) is widely used in the industries of domestic electric appliances such as washing machines (drums), dish washing machines (brackets), electric cookers and the like due to the excellent characteristics of light weight, low cost, simple and convenient processing and the like, national standards GB21551.2-2010 and GB21551.5-2010 require that the first-test antibacterial rate of the electric appliances for household and similar purposes is not less than 96.0%, and after the electric appliances are used for 2000 times or 2300 hours, the antibacterial rate still needs to be not less than 86.0%, relevant manufacturers compete to improve the respective competitiveness, the standard is improved to 99%, and higher requirements are provided for the easy cleanability and the antibacterial property of the material. After the washing machine is used for a long time, dirt is stored and taken in the interlayer of the inner cylinder and the outer cylinder, the phenomenon is caused to be mainly caused by residual dirt on the surface of the material, and the adhesion of the dirt on the surface of the material can be greatly reduced by improving the hydrophobic property of the material, so that the antibacterial and mildewproof properties of household appliances are improved. Moreover, as the pursuit of the public for high-quality healthy life extends to other household products, new requirements are provided for the dirt resistance and easy cleaning performance of household products, such as easy cleaning of fruit juice, pigment, oil stain and the like. On the other hand, the current automotive interior parts are required to have a matte effect, so that the influence of light reflection on glass on driving is avoided, and the driving safety is ensured.
The expandable microsphere is a novel physical foaming agent, is shaped like a balloon, and consists of a thermoplastic shell and a volatile gas solvent, wherein the shell is usually made of an acrylic copolymer and an acrylonitrile copolymer, and the volatile gas solvent is mainly made of hydrocarbons such as isobutane or isopentane and the like. After heating, the internal solvent is strongly gasified, so that the volume of the polymer shell is severely expanded to 80-100 times, and the polymer shell can be solidified after low-temperature cooling, and is the only dense-pore expanding agent in the world. At present, the auxiliary agent is widely applied to different fields such as soles, toys for children, coatings and the like, but is not used in the field of modified plastics on a large scale. With the development of the technology and the continuous updating of products, a series of products with different temperature resistance and different foaming ratios are designed.
Patent CN103709509A mentions an expandable microsphere filling modified polypropylene composite material and a preparation method thereof, which is characterized in that: 1) adding components such as expandable microspheres into a double-screw extruder in a sectional feeding mode, performing extrusion granulation, and performing single-screw injection molding subsequently to obtain a finished piece; 2) a single expandable microsphere is used. The micro-foaming polypropylene prepared by the method has the following problems: 1) the expandable microspheres are added into the micro-foamed polypropylene prepared by the method in the extrusion process, and the microspheres are inevitably cracked in the extrusion process, and are partially foamed, so that great difficulty is caused for injection molding; 2) the patent only aims at weight reduction performance, and does not excavate other performances.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-density low-dielectric hydrophobic polypropylene composite material and a preparation method thereof, so as to achieve the purposes of reducing density, reducing dielectric constant, improving warping deformation, reducing cost and the like, and simultaneously expand the application of a glass fiber reinforced polypropylene material.
The invention provides a low-density low-dielectric hydrophobic polypropylene composite material which comprises the following components in parts by weight:
85-98 parts of modified polypropylene master batch;
11-15 parts of expandable microsphere master batch;
21-15 parts of expandable microsphere master batch;
the modified polypropylene master batch comprises the following components in parts by weight:
50-95 parts of polypropylene;
5-40 parts of inorganic filler;
0-50 parts of glass fiber;
0-10 parts of a toughening agent;
0-5 parts of a compatilizer;
0.2-2 parts of an interface modifier;
0.3-3 parts of a lubricant;
0.3-3 parts of antioxidant;
the expandable microsphere master batch 1 and the expandable microsphere master batch 2 are expandable microsphere master batches with different temperature resistances.
The average diameter of the microspheres of the expandable microsphere master batch 1 is 25-40 μm, the initial foaming temperature is between 135-145 ℃, the foaming peak temperature is between 185-195 ℃, and the minimum foaming density is less than 15kg/m3The foaming ratio can be adjusted by temperature and process, and the resin matrix is a thermoplastic elastomer.
The average diameter of the microspheres of the expandable microsphere master batch 2 is 8-20 μm, the initial foaming temperature is between 200 and 220 ℃, the foaming peak temperature is between 255 and 265 ℃, and the minimum foaming density is less than 30kg/m3The foaming ratio can be adjusted by temperature and process, and the resin matrix is a thermoplastic elastomer.
The polypropylene is one or two of homo-polypropylene and co-polypropylene; the melt flow rate is between 1 and 60g/10min at 230 ℃/2.16kg test conditions.
The inorganic filler is one or more of calcium carbonate, talcum powder and mica powder.
The glass fiber is one or more of long glass fiber, short glass fiber, continuous glass fiber, low dielectric glass fiber and flat glass fiber.
The compatilizer is one or two of maleic anhydride grafted polypropylene PP-g-MAH and maleic anhydride grafted POE.
The toughening agent is one or more of ethylene-octene copolymer POE, ethylene propylene diene monomer EPDM, styrene-ethylene-butylene-styrene copolymer SEBS.
The interface modifier is one or two of hydroxyl-terminated hyperbranched polyester and carboxyl-terminated hyperbranched polyester.
The lubricant is one or more of erucamide, oleamide, EBS amides, PE wax and stearate.
The antioxidant is one or more of antioxidant 1010 (pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate) ], antioxidant 168 (tris (2, 4-di-tert-butylphenyl) phosphite), antioxidant 1790(1,3, 5-tris (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione), and antioxidant 412S (pentaerythritol tetrakis 3-lauryl thiopropionate).
The invention also provides a preparation method of the low-density low-dielectric hydrophobic polypropylene composite material, which comprises the following steps:
(1) weighing and uniformly mixing polypropylene, inorganic filler, compatilizer, flexibilizer, interface regulator, antioxidant and lubricant in proportion, selecting side feeding for glass fiber, extruding the mixture by a double-screw extruder, and carrying out strand cutting and dicing to obtain modified polypropylene master batches;
(2) and (3) blending the modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to a ratio, and mixing to obtain the low-density low-dielectric hydrophobic polypropylene composite material by using a single-screw injection molding machine.
According to the invention, two expandable microsphere master batches with different temperature resistances are added into modified polypropylene, and a proper process is selected for injection molding, so that microspheres with poor temperature resistances are cracked, the foaming of microspheres with excellent temperature resistances is ensured, a micro-nano rough surface is constructed while the comprehensive performance of the material is ensured, the hydrophobic modification is realized, and the polypropylene material with the matte characteristic is prepared.
Advantageous effects
(1) On one hand, the reinforced, filled or reinforced and filled composite modified polypropylene can be selected according to different application scenes so as to meet the performance requirements of different parts; on the other hand, the two different expandable microspheres have different foaming temperatures, and a proper processing technology is selected, so that effective regulation and control of microsphere foaming can be realized, the density is reduced, the microspheres with poor temperature resistance are broken, the foaming of the microspheres with excellent temperature resistance is ensured, the comprehensive performance of the material is ensured, and the micro-nano rough surface is constructed to realize hydrophobic modification;
(2) according to the invention, by adopting the two-step method, the modified polypropylene master batch and the two different expandable microsphere master batches are blended, so that the cracking of the expandable microspheres caused by the shearing of the screw and the glass fiber/friction thereof in the processing process is effectively reduced, the maximization of the expansion ratio of the microspheres is ensured, the advantages of the expandable microspheres are fully exerted, and the density, the dielectric constant and the like of the material are effectively reduced.
Drawings
FIG. 1 is a video shot of a water droplet during the rolling of the surface of the material of the present invention.
FIG. 2 is a comparison of contact angles before and after modification of the material of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The raw materials used in the following examples:
the average diameter of the microspheres of the expandable microsphere master batch 1 is 25-40 μm, the initial foaming temperature is between 135-145 ℃, the foaming peak temperature is between 185-195 ℃, and the minimum foaming density is less than 15kg/m3。
The average diameter of the microspheres of the expandable microsphere master batch 2 is 8-20 μm, the initial foaming temperature is between 200 and 220 ℃, the foaming peak temperature is between 255 and 265 ℃, and the minimum foaming density is less than 30kg/m3。
The polypropylene is one or two of homo-polypropylene and co-polypropylene; the melt flow rate is between 1 and 60g/10min at 230 ℃/2.16kg test conditions.
Example 1
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And (3) uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 98:1:1 at room temperature to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 2
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And (3) uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 96:1:3 at room temperature to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 3
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And at room temperature, uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 96:2:2 to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 4
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And (3) uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 92:4:4 at room temperature to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 5
After 60 parts of polypropylene resin, 40 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, the mixture is added into a main feeding port of a double-screw extruder, the temperature of the extruder is controlled between 200 and 230 ℃, and the mixture is subjected to bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And at room temperature, uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 96:2:2 to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 6
After 75 parts of polypropylene resin, 25 parts of calcium carbonate, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, the mixture is added into a main feeding port of a double-screw extruder, the temperature of the extruder is controlled between 200 and 230 ℃, and the mixture is subjected to bracing, cooling and granulating to obtain the talcum powder filling modified polypropylene master batch. And at room temperature, uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 96:2:2 to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 7
After 68 parts of polypropylene resin, 20 parts of talcum powder, 2 parts of PP-g-MAH, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interface modification auxiliary agent are uniformly mixed, a main feeding port of a double-screw extruder is added, 10 parts of chopped glass fiber is poured into a side feeding port at the rear end of the double-screw extruder, the temperature of the extruder is controlled between 200 and 230 ℃, and the chopped glass fiber is subjected to bracing, cooling and dicing to obtain the talcum powder-glass fiber composite modified polypropylene master batch. And (3) uniformly mixing the prepared talcum powder-glass fiber composite modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 96:2:2 at room temperature to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Example 8
After 70 parts of polypropylene resin, 25 parts of calcium carbonate, 5 parts of POE, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, the mixture is added into a main feeding port of a double-screw extruder, the temperature of the extruder is controlled between 200 ℃ and 230 ℃, and the mixture is subjected to bracing, cooling and granulating to obtain the talcum powder filling modified polypropylene master batch. And at room temperature, uniformly mixing the prepared talcum powder filled modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to the weight ratio of 96:2:2 to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Comparative example 1
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Comparative example 2
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And (3) uniformly mixing the prepared talcum powder filled modified polypropylene master batch and the expandable microsphere master batch 1 according to the weight ratio of 96:4 at room temperature to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Comparative example 3
After 75 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, adding the mixture into a main feeding port of a double-screw extruder, controlling the temperature of the extruder to be between 200 and 230 ℃, and carrying out bracing, cooling and granulating to obtain the talcum powder filled and modified polypropylene master batch. And (3) at room temperature, uniformly mixing the prepared talcum powder filled modified polypropylene master batch and the expandable microsphere master batch 2 according to the weight ratio of 96:4 to obtain the expandable microsphere modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Comparative example 4
71 parts of polypropylene resin, 25 parts of talcum powder, 0.1 part of antioxidant 1010, 0.2 part of antioxidant 168, 0.3 part of EBS amide lubricant and 0.5 part of hyperbranched interfacial modification auxiliary agent are uniformly mixed, then the mixture is added into a main feeding port of a double-screw extruder, 2 parts of expandable microsphere master batch 1 and 2 parts of expandable microsphere master batch 2 are added from a side feeding port at the rear end, the temperature of the extruder is controlled between 200 and 230 ℃, and the mixture is subjected to bracing, cooling and grain cutting to obtain the modified polypropylene material. The material is injection molded into products within the temperature range of 190 ℃ and 250 ℃, and the relevant performance test results of the products are shown in Table 1.
Performance test evaluation mode:
density test standard: ISO1183-1:2004, impregnation method, temperature: 23 ℃, impregnation liquid: ethanol;
tensile test standard: ISO527, tensile speed 10 mm/min;
bending test standard: ISO178, speed: 2 mm/min;
cantilever beam notch impact test: ISO 179, 4mm thick specimens;
contact angle: contact medium-water;
and (3) testing the glossiness: the angle is 60 deg..
Table 1 example and comparative example formulations and performance test results
As can be seen from table 1, the density of the product was significantly reduced after the expandable microsphere masterbatch was added. As can be seen by comparing the data of examples 1-4 with the data of comparative example 1, the glossiness of the system is remarkably reduced after the expandable microspheres are added, when 4 parts of expandable microsphere master batch 1 and expandable microsphere master batch 2 are respectively added, the glossiness of the system is reduced from 62Gu to 22Gu, the matte degree is greatly improved, the water contact angle is increased from 107 degrees to 132 degrees, water drops are not easy to remain, and the easy-to-clean property of the material is remarkably improved. It can be seen from the comparison of the data in the example 3 and the comparative examples 2 to 4 that only 4 parts of expandable microsphere master batch 1 or expandable microsphere master batch 2 are added, the contact angle can only reach about 110 degrees, the surface gloss is 38GU, and compared with the simultaneous addition of 2 parts of expandable microsphere master batch 1 or 2 parts of expandable microsphere master batch 2, the contact angle is 22 degrees lower, and the gloss is 17GU higher, mainly because of the simultaneous addition of the two master batch systems, part of microspheres can be cracked on the surface through the regulation and control of the process, so that a micro-nano convex surface is formed, the contact angle is improved, and the gloss is reduced at the same time. In addition, the mode of feeding expandable microsphere master batches at the side after extrusion is selected, and expandable microspheres are subjected to two stages of double-screw extrusion and single-screw injection molding, so that the foaming degree and the cracking degree of the microspheres are influenced to different degrees, the final result is poor, and particularly the contact angle is low.
It can be seen from the data of examples 5-8 that, in the case of the talc powder filling system, the glass fiber reinforced system, the glass fiber-talc powder composite modified system, the calcium carbonate filling system, and the calcium carbonate and toughening agent composite modified system, when 4 parts of the expandable microsphere master batch 1 and the expandable microsphere master batch 2 are added, the contact angle of the material is improved to different degrees, the dirt resistance is improved, the gloss is reduced to different degrees, and the matte performance is improved.
Therefore, by combining the above cases, two expandable microsphere master batches with different temperature resistance degrees are introduced into the modified polypropylene master batch, and injection molding is performed by adopting a master batch blending mode, so that the contact angle of the workpiece can be effectively improved, the glossiness of the workpiece can be effectively reduced, and the density of the workpiece can be reduced.
Claims (10)
1. A low-density low-dielectric hydrophobic polypropylene composite material is characterized in that: the composition comprises the following components in parts by weight:
85-98 parts of modified polypropylene master batch;
11-15 parts of expandable microsphere master batch;
21-15 parts of expandable microsphere master batch;
the modified polypropylene master batch comprises the following components in parts by weight:
50-95 parts of polypropylene;
5-40 parts of inorganic filler;
0-50 parts of glass fiber;
0-10 parts of a toughening agent;
0-5 parts of a compatilizer;
0.2-2 parts of an interface modifier;
0.3-3 parts of a lubricant;
0.3-3 parts of antioxidant;
the expandable microsphere master batch 1 and the expandable microsphere master batch 2 are expandable microsphere master batches with different temperature resistances.
2. The composite material of claim 1, wherein: the average diameter of the microspheres of the expandable microsphere master batch 1 is 25-40 μm, the initial foaming temperature is between 135-145 ℃, the foaming peak temperature is between 185-195 ℃, and the minimum foaming density is less than 15kg/m3(ii) a The average diameter of the microspheres of the expandable microsphere master batch 2 is 8-20 μm, the initial foaming temperature is between 200 and 220 ℃, the foaming peak temperature is between 255 and 265 ℃, and the minimum foaming density is less than 30kg/m3。
3. The composite material of claim 1, wherein: the polypropylene is one or two of homo-polypropylene and co-polypropylene; the melt flow rate is between 1 and 60g/10min at 230 ℃/2.16kg test conditions.
4. The composite material of claim 1, wherein: the inorganic filler is one or more of calcium carbonate, talcum powder and mica powder.
5. The composite material of claim 1, wherein: the glass fiber is one or more of long glass fiber, short glass fiber, continuous glass fiber, low dielectric glass fiber and flat glass fiber.
6. The composite material of claim 1, wherein: the compatilizer is one or two of maleic anhydride grafted polypropylene PP-g-MAH and maleic anhydride grafted POE.
7. The composite material of claim 1, wherein: the toughening agent is one or more of ethylene-octene copolymer POE, ethylene propylene diene monomer EPDM, styrene-ethylene-butylene-styrene copolymer SEBS.
8. The composite material of claim 1, wherein: the interface modifier is one or two of hydroxyl-terminated hyperbranched polyester and carboxyl-terminated hyperbranched polyester.
9. The composite material of claim 1, wherein: the lubricant is one or more of erucamide, oleamide, EBS amides, PE wax and stearate; the antioxidant is one or more of antioxidant 1010, antioxidant 168, antioxidant 1790 and antioxidant 412S.
10. A method of preparing the low density low dielectric hydrophobic polypropylene composite of claim 1, comprising:
(1) weighing and uniformly mixing polypropylene, inorganic filler, compatilizer, flexibilizer, interface regulator, antioxidant and lubricant in proportion, selecting side feeding for glass fiber, extruding the mixture by a double-screw extruder, and carrying out strand cutting and dicing to obtain modified polypropylene master batches;
(2) and (3) blending the modified polypropylene master batch with the expandable microsphere master batch 1 and the expandable microsphere master batch 2 according to a ratio, and mixing to obtain the low-density low-dielectric hydrophobic polypropylene composite material by using a single-screw injection molding machine.
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| CN114316452A (en) * | 2022-01-04 | 2022-04-12 | 苏州浩纳新材料科技有限公司 | Super-hydrophobic foamed polypropylene and preparation method thereof |
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