CN110437540B - Polypropylene material with low dielectric constant, high strength and good weather resistance and preparation method thereof - Google Patents
Polypropylene material with low dielectric constant, high strength and good weather resistance and preparation method thereof Download PDFInfo
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- CN110437540B CN110437540B CN201910839419.9A CN201910839419A CN110437540B CN 110437540 B CN110437540 B CN 110437540B CN 201910839419 A CN201910839419 A CN 201910839419A CN 110437540 B CN110437540 B CN 110437540B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
Abstract
The invention discloses a polypropylene material with low dielectric constant, high strength and good weather resistance and a preparation method thereof, wherein the polypropylene material is prepared from the following raw materials in parts by weight: 60-70 parts of polypropylene, 10-30 parts of modifier, 0-25 parts of inorganic filler, 0.1-0.3 part of antioxidant, 2-5 parts of compatilizer and 0.6-1.2 parts of BN hexagonal crystal; and (3) placing the components in a high-speed stirrer, stirring and mixing uniformly, then melting and mixing the uniformly mixed materials in a double-screw extruder, extruding and granulating to obtain the composite material. The modified PP material prepared by the invention has low dielectric constant, high strength and good weather resistance, can still keep good dielectric property, mechanical property, flame retardant property and dimensional stability under severe environment, and can be widely applied to 5G machine part materials, insulating materials of electronic and electrical elements, high-temperature connectors and the like.
Description
The technical field is as follows:
the invention relates to the technical field of macromolecules, in particular to a polypropylene material with low dielectric constant, high strength and good weather resistance and a preparation method thereof.
Background art:
the 5G era is coming, and low dielectric constant materials are attracting attention because the power consumption of 5G electronic components, televisions and facsimile systems cannot be ignored. By reducing the dielectric constant of the dielectric material used in the integrated circuit, the leakage current of the integrated circuit can be reduced, the capacitance effect between the leads can be reduced, the phenomenon of heat generation of the integrated circuit can be reduced, and the use efficiency of the electronic material can be improved.
The polypropylene material is thermoplastic synthetic resin with excellent performance, the high-frequency electrical performance of the polypropylene is excellent, the polypropylene is hardly influenced by the environmental humidity, and the polypropylene material has the advantages of high dielectric strength, low dielectric constant (2.20-2.60), small specific gravity, no toxicity, easy processing, impact strength and the like. However, polypropylene has some disadvantages, such as a large molding shrinkage, poor cold resistance, and a low heat distortion temperature.
In order to improve the overall performance of polypropylene materials, a great deal of research has been conducted by researchers.
CN109206734A discloses a preparation method of a glass fiber reinforced polypropylene composite material, the production process of the invention is simple, the rigidity of polypropylene is effectively enhanced, the prepared material has higher strength, but the dielectric property of polypropylene is not improved, and the weather resistance is not improved.
It is required to develop a polypropylene material having improved mechanical properties, dielectric properties, weather resistance and the like.
The invention content is as follows:
the invention aims to provide a polypropylene material with low dielectric constant, high strength and good weather resistance and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a polypropylene material with low dielectric constant, high strength and good weather resistance is prepared from the following components in parts by weight:
60-70 Parts of Polypropylene (PP),
10-30 parts of a modifier, namely,
0 to 25 parts of inorganic filler,
0.1 to 0.3 portion of antioxidant,
2-5 parts of a compatilizer,
0.6-1.2 parts of BN hexagonal crystal.
The polypropylene is selected from one or more of isotactic polypropylene, block polypropylene or random copolymerization polypropylene. Preferably, the polypropylene has a melt flow rate of 30-50g/10min at 230 ℃/2.16 Kg.
The modifier is polyetherimide. The modifier is dispersed in the polypropylene matrix, has a synergistic effect with the polypropylene matrix, maintains high strength, and still has good dielectric properties at low temperature.
Preferably, the antioxidant comprises a main antioxidant and a secondary antioxidant, wherein the main antioxidant accounts for 60-80% of the total mass of the antioxidant, the main antioxidant is hindered phenol, preferably a novel antioxidant 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether, and the secondary antioxidant is a phosphite antioxidant, preferably a tris (2, 4-di-tert-butylphenyl) phosphite antioxidant, such as Irgafos 168.
The inorganic filler is high-insulation filler, including glass fiber, mica and the like, and the mass ratio of the glass fiber to the mica is preferably 0.5-5: 1.
The compatilizer comprises maleic anhydride graft modified chlorinated polypropylene and optional dendrimer CYD-6100 (Wenhamen original molecular new material company), wherein the mass percentage content of CYD-6100 in the compatilizer is 0-25%, and preferably 5-20%.
Preferably, the maleic anhydride graft ratio of the maleic anhydride graft-modified chlorinated polypropylene is 1.50-3.56%, and the chlorine content is 26.6-30.0%. The maleic anhydride graft-modified chlorinated polypropylene can be prepared by a conventional method in the prior art.
The maleic anhydride graft modified chlorinated polypropylene increases the polarity of the polypropylene matrix, so that the compatibility of the polypropylene matrix to the inorganic filler is improved. Particularly, when the maleic anhydride graft modified chlorinated polypropylene and CYD-6100 are used together, the structure of the CYD-6100 dendrimer is utilized, the compatibility of the polyetherimide and the surface of the polypropylene substrate is greatly increased, the cohesive force between the polymers is enhanced, a stable structure is formed, the rigidity of the polypropylene material is enhanced, the molding shrinkage rate is improved, and the dispersibility of the filler is enhanced, so that the mechanical strength of the composite material is improved.
Another object of the present invention is to provide a method for preparing the polypropylene material with low dielectric constant, high strength and good weather resistance, which comprises the following steps:
(1) dewatering the components according to the proportion, and then placing the components into a high-speed stirrer to be stirred for 3 to 5 minutes and uniformly mixed; the water removing condition can be drying for 4-6h at 60-80 ℃;
(2) and melting and mixing the uniformly mixed materials in a double-screw extruder, extruding and granulating to obtain the modified polypropylene material with low dielectric constant, high strength and good weather resistance.
The double-screw extruder has a screw diameter of 50-65mm and a length-diameter ratio of the screw of 25:1-40:1, and the melt mixing temperature of the extruder is set as follows: the temperature of the conveying section is 165-180 ℃, the temperature of the plasticizing section is 185-195 ℃, and the temperature of the metering section is 190-215 ℃; the screw rotation speed is 200-220 r/min.
The modified PP material prepared by the invention has low dielectric constant, high strength and good weather resistance, can still maintain good dielectric property, mechanical property, flame retardant property and dimensional stability under severe environment, and can be widely applied to 5G machine part materials, insulating materials of electronic and electrical elements, high-temperature connectors and the like.
The invention has the beneficial effects that:
1. according to the invention, the polyetherimide is used for modifying the polypropylene, so that the dielectric constant of the polypropylene is reduced, the dielectric property of the polypropylene is improved, the mechanical property of the polypropylene material is improved, the shrinkage rate is reduced, and the flame retardant property and the weather resistance are improved, so that the prepared material has excellent dielectric property, and can be widely applied to high-temperature-resistant electronic and electrical insulating materials.
2. In the preparation process of the modified polypropylene, the maleic anhydride grafted modified chlorinated polypropylene and CYD-6100 act together to serve as a compatilizer, oxygen-containing polar groups are introduced into the maleic anhydride modified CPP to improve the interaction with the surface of a polar material, and after the maleic anhydride modified CPP and the CYD-6100 act together, the compatibility of the polyetherimide and the surface of a polypropylene substrate is greatly improved, so that the bonding force between polymers is enhanced, the polymers are enriched at the interface between continuous phase PP and disperse phase PEI, a good anchoring effect is achieved, the bonding degree of the continuous phase PP and the disperse phase PEI is enhanced, and the compatibility is greatly improved.
3. By adding the ultra-low dielectric constant BN hexagonal crystal, a nano-scale microporous structure is formed in the modified plastic, and the nano-scale microporous structure and the modifier act together, so that the dielectric property of the polypropylene material is obviously improved under the condition of not influencing the strength of the polypropylene.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Examples source of raw materials:
isotactic homo-polypropylene (IPP) was selected in the following examples and was petrochemical from the manufacturer's Yanshan mountain.
BN hexagonal crystal, manufacturer source: nanchang national Material science and technology Co.
Polyetherimide, manufacturer source: boer Special plastics, Inc., Dongguan.
The preparation method of the maleic anhydride grafted modified chlorinated polypropylene comprises the following steps:
preparation of CPP-g-MAH with chlorine content of 26.6% and maleic anhydride grafting rate of 3.56%:
vacuumizing a reaction kettle, filling nitrogen, adding 95g of chlorinated polypropylene, wherein the chlorine content is 28.2%, and 3.0g of maleic anhydride into the reaction kettle, adding xylene into the reaction kettle, stirring, heating to 60 ℃ to completely dissolve the chlorinated polypropylene and the maleic anhydride; continuously heating to 115 ℃, dropwise adding 20g of BPO xylene solution with the concentration of 1.2 wt% into the reaction kettle, keeping the temperature for reaction for 1.2h after dropwise adding, pouring the reaction material into an acetone-absolute ethyl alcohol mixed solution for precipitation, wherein the volume ratio of acetone to absolute ethyl alcohol is 1:1, performing Soxhlet extraction on the precipitate for 8h, drying at 60 ℃ in vacuum for 12h to obtain CPP-g-MAH, and measuring the final chlorine content to be 26.6% and the grafting rate of maleic anhydride to be 3.56%.
The product performance testing method comprises the following steps:
the tensile strength and the elongation at break are carried out according to GB/T1040-2006;
the dielectric constant is tested according to GB/T1409-;
the Heat Distortion Temperature (HDT) was carried out according to GB/T1634.1-2004 at a heating rate of 120 ℃/h;
shrinkage was performed according to GB/T15585-1995;
the flame retardant grade is carried out according to GB/T2408-2008.
The twin-screw extruders of the examples and comparative examples had a screw diameter of 65mm and a screw length-diameter ratio of 40: 1. All the raw materials used have been subjected to water removal treatment, and the amounts of the raw materials used in the examples and comparative examples refer to parts by mass.
Example 1
Weighing 65 parts of isotactic polypropylene homopolymer, 15 parts of polyetherimide, 2 parts of glass fiber, 3 parts of mica, 0.1 part of antioxidant 3, 5-di-tert-butyl-4-hydroxy benzyl methyl ether, 0.05 part of Irgafos168 antioxidant, 2 parts of maleic anhydride modified chlorinated polypropylene, 0.4 part of CYD-6100 and 1.0 part of BN hexagonal crystal, mixing for 5 minutes in a high-speed mixer, and melting and mixing the uniformly mixed materials in a double-screw extruder. The melt mixing temperature of the extruder was set to: the temperature of the conveying section is 170 ℃, the temperature of the plasticizing section is 190 ℃, and the temperature of the metering section is 200 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Example 2
Weighing 63 parts of isotactic polypropylene homopolymer, 12 parts of polyetherimide, 5 parts of glass fiber, 0.15 part of 3, 5-di-tert-butyl-4-hydroxy benzyl methyl ether antioxidant, 0.10 part of Irgafos168 antioxidant, 3 parts of maleic anhydride modified chlorinated polypropylene, 0.6 part of CYD-6100 and 1.2 parts of BN hexagonal crystal, mixing for 5 minutes in a high-speed mixer, and melting and mixing the uniformly mixed materials in a double-screw extruder. The melt mixing temperature of the extruder was set to: the temperature of the conveying section is 172 ℃, the temperature of the plasticizing section is 185 ℃, and the temperature of the metering section is 205 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Example 3
Weighing 70 parts of isotactic polypropylene, 10 parts of polyetherimide, 5 parts of glass fiber, 5 parts of mica, 0.15 part of 3, 5-di-tert-butyl-4-hydroxy benzyl methyl ether antioxidant, 0.05 part of Irgafos168 antioxidant, 4 parts of maleic anhydride modified chlorinated polypropylene, 0.8 part of CYD-6100 and 0.8 part of BN hexagonal crystal, mixing for 5 minutes in a high-speed mixer, and melting and mixing the uniformly mixed materials in a double-screw extruder. The melt mixing temperature of the extruder was set to: the temperature of the conveying section is 170 ℃, the temperature of the plasticizing section is 188 ℃, and the temperature of the metering section is 200 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Example 4
Weighing 65 parts of isotactic polypropylene homopolymer, 15 parts of polyetherimide, 0.1 part of antioxidant 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether, 0.05 part of Irgafos168 antioxidant, 2 parts of maleic anhydride modified chlorinated polypropylene, 0.4 part of CYD-6100 and 1.0 part of BN hexagonal crystal, mixing for 5 minutes in a high-speed mixer, and melting and mixing the uniformly mixed materials in a double-screw extruder. The melt mixing temperature of the extruder was set to: the temperature of the conveying section is 173 ℃, the temperature of the plasticizing section is 195 ℃, and the temperature of the metering section is 200 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Comparative example 1
Weighing 65 parts of isotactic polypropylene, 2 parts of glass fiber, 3 parts of mica, 0.1 part of antioxidant 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether and 0.05 part of Irgafos168 antioxidant, mixing for 5 minutes in a high-speed mixer, and melting and mixing the uniformly mixed materials in a double-screw extruder. The melt mixing temperature of the extruder was set to: the temperature of the conveying section is 170 ℃, the temperature of the plasticizing section is 190 ℃, and the temperature of the metering section is 200 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Comparative example 2
Weighing 63 parts of isotactic polypropylene, 5 parts of glass fiber, 0.15 part of 3, 5-di-tert-butyl-4-hydroxy benzyl methyl ether antioxidant, 0.10 part of Irgafos168 antioxidant, 3 parts of maleic anhydride modified chlorinated polypropylene, 0.6 part of CYD-6100 and 1.2 parts of BN hexagonal crystal, mixing for 5 minutes in a high-speed mixer, melting and mixing the uniformly mixed materials in a double-screw extruder, wherein the melting and mixing temperature of the extruder is set as: the temperature of the conveying section is 172 ℃, the temperature of the plasticizing section is 185 ℃, and the temperature of the metering section is 205 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Comparative example 3
Weighing 65 parts of isotactic polypropylene homopolymer, 12 parts of polyetherimide, 2 parts of glass fiber, 3 parts of mica, 0.1 part of antioxidant 3, 5-di-tert-butyl-4-hydroxy benzyl methyl ether, 0.05 part of Irgafos168 antioxidant, 2 parts of maleic anhydride modified chlorinated polypropylene and 0.4 part of CYD-6100, mixing for 5 minutes in a high-speed mixer, melting and mixing the uniformly mixed materials in a double-screw extruder, wherein the melting and mixing temperature of the extruder is set as: the temperature of the conveying section is 170 ℃, the temperature of the plasticizing section is 190 ℃, and the temperature of the metering section is 200 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
Comparative example 4
Weighing 70 parts of isotactic polypropylene homopolymer, 10 parts of polyetherimide, 5 parts of glass fiber, 5 parts of mica, 0.15 part of 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether antioxidant, 0.05 part of Irgafos168 antioxidant and 0.8 part of BN hexagonal crystal, mixing for 5 minutes in a high-speed mixer, and melting and mixing the uniformly mixed materials in a double-screw extruder, wherein the melting and mixing temperature of the extruder is set as: the temperature of the conveying section is 170 ℃, the temperature of the plasticizing section is 190 ℃, and the temperature of the metering section is 200 ℃; the screw speed was 200 rpm.
After the material is extruded, the extruded material is cooled and cut into granules under water, the temperature is kept constant at 23 ℃, after the extruded material is placed for 16 hours, a sample strip is made by an injection molding machine, the temperature is kept constant at 23 ℃, and after the extruded material is placed for 48 hours at 50% humidity, the performance test is carried out, and the results are shown in table 1.
TABLE 1 Performance testing of the examples and comparative examples
Observing table 1:
compared with the test data of the comparative example 1, the test data shows that the modified polypropylene prepared by the invention has low dielectric constant, high strength and good weather resistance due to the synergistic effect of the added modifier of polyimide, the compatilizer, the BN hexagonal crystal with ultra-low dielectric constant and the inorganic filler, and can still maintain good dielectric property, mechanical property, flame retardant property and dimensional stability under severe environment.
Comparing example 2 with comparative example 2, it can be seen that the addition of polyether imide greatly improves the weatherability of the system and the tensile strength of polypropylene, and reduces the shrinkage of the system.
Comparing example 1 with comparative example 3, the invention adds BN hexagonal crystal, reduces the dielectric constant of the modified polypropylene system, and improves the dielectric property of the material.
Comparing example 3 with comparative example 4, it can be seen that, when the maleic anhydride graft-modified chlorinated polypropylene and CYD-6100 are used together as a compatibilizer, the compatibility of the polyimide and the surface of the polypropylene substrate is greatly increased, so that the adhesive force between the polymers is enhanced, and a stable structure is formed. Obviously shows that the mechanical property, the thermal property and the shrinkage rate of the modified polypropylene material are obviously improved.
Claims (12)
1. A polypropylene material with low dielectric constant, high strength and good weather resistance is characterized in that: the composition is prepared from the following components in parts by weight:
60-70 Parts of Polypropylene (PP),
10-30 parts of a modifier, wherein the modifier is polyetherimide,
0 to 25 parts of inorganic filler,
0.1 to 0.3 portion of antioxidant,
2-5 parts of compatilizer, wherein the compatilizer comprises maleic anhydride graft modified chlorinated polypropylene and dendrimer CYD-6100, the mass percentage of the CYD-6100 in the compatilizer is 5-20%,
0.6-1.2 parts of BN hexagonal crystal.
2. The polypropylene material of claim 1, wherein the polypropylene is selected from one or more of isotactic polypropylene, block polypropylene, or random copolymer polypropylene.
3. The polypropylene material according to claim 1 or 2, wherein the polypropylene has a melt flow rate of 30-50g/10min at 230 ℃/2.16 Kg.
4. The polypropylene material according to claim 1, wherein the inorganic filler comprises glass fibers, mica.
5. The polypropylene material according to claim 4, wherein the inorganic filler is glass fiber/mica in a mass ratio of 0.5 to 5: 1.
6. The polypropylene material according to claim 1, wherein the antioxidant comprises a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant accounts for 60-80% of the total mass of the antioxidant; the main antioxidant is hindered phenol, and the auxiliary antioxidant is phosphite ester antioxidant.
7. The polypropylene material according to claim 6, wherein the primary antioxidant is 3, 5-di-tert-butyl-4-hydroxybenzyl methyl ether, and the secondary antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite antioxidant.
8. The polypropylene material according to claim 1, wherein the maleic anhydride graft ratio of the maleic anhydride graft-modified chlorinated polypropylene is 1.50-3.56%, and the chlorine content is 26.6-30.0%.
9. A process for the preparation of a polypropylene material according to any one of claims 1 to 8, comprising:
(1) putting the components into a high-speed stirrer, and stirring and mixing uniformly;
(2) and melting and mixing the uniformly mixed materials in a double-screw extruder, extruding and granulating to obtain the modified polypropylene material with low dielectric constant, high strength and good weather resistance.
10. The method of claim 9, wherein in step (1), the components are dehydrated prior to mixing.
11. The method according to claim 9 or 10, wherein the twin-screw extruder has a screw diameter of 50 to 65mm and a screw length-to-diameter ratio of 25:1 to 40:1, and the melt mixing temperature of the extruder is set to: the temperature of the conveying section is 165-180 ℃, the temperature of the plasticizing section is 185-195 ℃, and the temperature of the metering section is 190-215 ℃; the screw rotation speed is 200-220 r/min.
12. Use of the polypropylene material according to any one of claims 1 to 8 and the polypropylene material prepared by the method according to any one of claims 9 to 11 in the fields of 5G machine parts, insulating materials of electronic and electric components and high-temperature connectors.
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| CN114044979A (en) * | 2021-11-17 | 2022-02-15 | 安庆会通新材料有限公司 | High-cohesiveness polypropylene composite material and preparation method thereof |
| CN114539693B (en) * | 2022-03-07 | 2023-03-28 | 宁波市青湖弹性体科技有限公司 | Flame-retardant low-dielectric-constant polypropylene insulating material and preparation method thereof |
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| CN110437540A (en) | 2019-11-12 |
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