CN110437540A - A kind of polypropylene material and preparation method thereof that low-k high-intensity weather-proof high is good - Google Patents
A kind of polypropylene material and preparation method thereof that low-k high-intensity weather-proof high is good Download PDFInfo
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- CN110437540A CN110437540A CN201910839419.9A CN201910839419A CN110437540A CN 110437540 A CN110437540 A CN 110437540A CN 201910839419 A CN201910839419 A CN 201910839419A CN 110437540 A CN110437540 A CN 110437540A
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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 kind of polypropylene materials and preparation method thereof that low-k high-intensity weather-proof high is good, it is prepared by the raw material for including following parts by weight content: 60-70 parts of polypropylene, 10-30 parts of modifying agent, 0-25 parts of inorganic filler, 0.1-0.3 parts of antioxidant, 2-5 parts of compatilizer, 0.6-1.2 parts of BN hexagonal；It will be uniformly mixed in the various groups of high-speed mixers that are placed in, then uniformly mixed material be subjected to melting mixing in double screw extruder, squeeze out, be granulated to obtain the final product.MODIFIED PP material dielectric constant produced by the present invention is low, high-intensitive, good weatherability, it is still able to maintain good dielectric properties, mechanical performance, flame retardant property and dimensional stability under adverse circumstances, can be widely applied to 5G parts material, the insulating materials of electric element and high temperature conjunction part etc..
Description
Technical field:
The present invention relates to technical field of macromolecules, and in particular to a kind of polypropylene that low-k high-intensity weather-proof high is good
Material and preparation method thereof.
Background technique:
The 5G epoch are coming, and the electric energy loss of 5G electronic component, television set and facsimile printer system cannot be ignored, because
And advanced low-k materials are concerned.By reducing the dielectric constant of dielectric material used in integrated circuit, can reduce
The phenomenon that leakage current of integrated circuit reduces the capacity effect between conducting wire, reduces integrated circuit fever, improves electronic material
Service efficiency.
Polypropylene material is a kind of thermoplastic synthetic resin of function admirable, and polyacrylic high-frequency electrical performance is excellent, almost
Do not influenced by ambient humidity, with dielectric strength height, dielectric constant low (2.20-2.60), specific gravity be small, nontoxic, easy processing,
The advantages that impact strength.But polypropylene is there are also disadvantage, and if any biggish molding shrinkage, cold resistance is poor, thermal deformation temperature
It spends not high.
In order to improve the comprehensive performance of polypropylene material, researcher had done numerous studies.
CN109206734A discloses a kind of preparation method of glass fiber reinforced polypropylene composite material, invention production
Simple process effectively enhances polyacrylic rigidity, and material, which is made, has higher-strength, but does not improve polyacrylic dielectric
Performance, weatherability are not also promoted.
It is good to need to develop a kind of mechanical property, and the polypropylene material that dielectric properties and weatherability etc. are improved.
Summary of the invention:
The purpose of the present invention is to provide a kind of polypropylene materials and its preparation that low-k high-intensity weather-proof high is good
Method, preparation method is simple for the composite material, composite material obtained have better dielectric properties, mechanical property and
Heat-resistant stable etc..
The purpose of the present invention can be achieved through the following technical solutions:
A kind of polypropylene material that low-k high-intensity weather-proof high is good, by include following components in parts by weight preparation and
At:
60-70 parts of polypropylene,
10-30 parts of modifying agent,
0-25 parts of inorganic filler,
0.1-0.3 parts of antioxidant,
2-5 parts of compatilizer,
0.6-1.2 parts of BN hexagonal.
The polypropylene is selected from one of isotactic polypropylene, block polypropylene or atactic copolymerized polypropene or a variety of.
Preferably, polypropylene melt flow rate (MFR) under the conditions of 230 DEG C/2.16Kg is 30-50g/10min.
The modifying agent is polyetherimide.The effect of modifying agent is dispersed in polypropylene matrix, with polypropylene matrix
Synergistic effect on the basis of remain high intensity, still has good dielectric properties at low temperature.
Preferably, the antioxidant includes primary antioxidant and auxiliary antioxidant, and wherein primary antioxidant accounts for antioxidant gross mass
60-80%, the primary antioxidant is Hinered phenols, preferably novel antioxidant 3,5- di-t-butyl -4- hydroxyl benzyl methyl ether,
The auxiliary antioxidant is phosphite antioxidant, preferably three (2,4- di-tert-butyl-phenyl) phosphite antioxidants, example
Such as Irgafos168.
The inorganic filler is using high-insulativity filler, including glass fibre, mica etc., preferably glass fibre and mica matter
Amount is than the mixture for 0.5-5:1.
The compatilizer includes modified by maleic acid anhydride graft chlorinated polypropylene and optional dendrimer, dendritic polymer CYD-6100 (prestige
Extra large morning original molecule new material company), the mass percentage of CYD-6100 is 0-25%, preferably 5-20% in compatilizer.
Preferably, the modified by maleic acid anhydride graft chlorinated polypropylene, maleic anhydride grafting ratio 1.50%-3.56%,
Chlorinity is 26.6%-30.0%.The conventional method of the prior art can be used in the modified by maleic acid anhydride graft chlorinated polypropylene
Preparation.
Modified by maleic acid anhydride graft chlorinated polypropylene increases the polarity of polypropylene matrix, fills out polypropylene matrix to inorganic
The compatibility of material makes moderate progress.Particularly, it when modified by maleic acid anhydride graft chlorinated polypropylene and CYD-6100 are used in conjunction with, utilizes
The structure of CYD-6100 dendrimer, dendritic polymer dramatically increases the compatibility of polyetherimide and polypropylene matrix surface, makes
Cohesive force enhancing between polymer, forms stable structure, enhances the rigidity of polypropylene material, have to molding shrinkage
Improve, while enhancing the dispersibility of filler, to improve the mechanical strength of composite material.
It is a further object to provide a kind of polypropylene materials that above-mentioned low-k high-intensity weather-proof high is good
Preparation method, comprising the following steps:
(1) according to the ratio the water removal of various components is placed in high-speed mixer to stir 3-5 minutes and is uniformly mixed；The water removal
Condition can be dry 4-6h at 60-80 DEG C；
(2) uniformly mixed material is subjected to melting mixing in double screw extruder, squeeze out, be granulated it is normal up to low dielectric
The good modified polypropylene material of number high-intensity weather-proof high.
The double screw extruder, screw diameter 50-65mm, screw rod draw ratio be 25:1-40:1, extruder it is molten
Melt mixing temperature setting are as follows: 165-180 DEG C of conveying section temperature, 185-195 DEG C of fluxing zone temperature, 190-215 DEG C of metering section temperature；
200 turns -220 revs/min of screw speed.
Low, high-intensitive, good weatherability the MODIFIED PP material of dielectric constant is made in the present invention, is still able to maintain under adverse circumstances good
Good dielectric properties, mechanical performance, flame retardant property and dimensional stability, can be widely applied to 5G parts material, electric member
Insulating materials and high temperature conjunction part of part etc..
The beneficial effects of the present invention are:
1, polypropylene is modified using polyetherimide in the present invention, reduces polyacrylic dielectric constant, improved
Polyacrylic dielectric properties, while improving the mechanical property of polypropylene material, shrinking percentage reduces, flame retardant property and resistance to simultaneously
It waits performance to improve, so that manufactured material has excellent dielectric properties, can be widely applied to electric insulation resistant to high temperature
In material.
2, made jointly in modified polypropene preparation process using modified by maleic acid anhydride graft chlorinated polypropylene and CYD-6100
With as compatilizer, maleic anhydride modified CPP introduces oxygen containing polar group, mentions with the interaction of polar material surface
After height, with CYD-6100 collective effect, dramatically increases the compatibility of polyetherimide and polypropylene matrix surface, make to gather
The cohesive force enhancing between object is closed, the interface between continuous phase PP and dispersed phase PEI is enriched in, plays good " anchor "
Effect, enhances the bonding degree of the two, and compatibility greatly improves.
3, by addition ultralow dielectric BN hexagonal, nano micropore structure is formed in modified plastics, and is changed
Property agent collective effect, in the case of not influencing strength of PP, significantly improves the dielectric properties of polypropylene material.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.
Embodiment raw material sources:
Isotactic homopolypropylene (IPP), manufacturing firm's Yanshan Petrochemical are selected in following Examples.
BN hexagonal, producer source: Nanchang Guo Cai Science and Technology Ltd..
Polyetherimide, producer source: Dongguan City bohr special plastic Co., Ltd.
The preparation method of modified by maleic acid anhydride graft chlorinated polypropylene:
Chlorinity 26.6%, maleic anhydride grafting ratio 3.56% CPP-g-MAH preparation:
After pouring nitrogen after reaction kettle is vacuumized, chlorinated polypropylene 95g is added in Xiang Suoshu reaction kettle, wherein chlorinity
For 28.2% and maleic anhydride 3.0g, and dimethylbenzene is added thereto, stir and be heated to 60 DEG C make chlorinated polypropylene and
Maleic anhydride dissolution is complete；The dimethylbenzene for being continuously heating to be added dropwise the BPO that concentration is 1.2wt% in 115 DEG C of backward reaction kettles is molten
Liquid 20g is added dropwise rear insulation reaction 1.2h, then pours into acetone-dehydrated alcohol mixed solution and precipitate to reaction mass, wherein
The volume ratio of acetone and dehydrated alcohol is 1:1, and by sediment, 12h is descended in 60 DEG C of dryings of vacuum after Soxhlet extraction 8h again, is obtained
CPP-g-MAH, measuring final chlorinity is 26.6%, maleic anhydride grafting ratio 3.56%.
Properties of product test method:
Tensile strength, elongation at break are carried out according to GB/T 1040-2006；
Dielectric constant according to GB/T 1409-2006 carry out, test frequency 1MHz, test bars having a size of 8mm ×
3.2mm × 1.6mm carries out the test of dielectric constant after test bars surface is uniformly coated with silver electrode；
Heat distortion temperature (HDT) is carried out according to GB/T1634.1-2004, and the rate of heat addition is 120 DEG C/h；
Shrinking percentage is carried out according to GB/T15585-1995；
Fire-retardant rank is carried out according to GB/T2408-2008.
The screw diameter of the double screw extruder of embodiment and comparative example is 65mm, the draw ratio of screw rod is 40:1.Made
Raw material, which has been subjected to, removes water process, and raw material dosage refers both to mass parts in embodiment and comparative example.
Embodiment 1
Weigh 65 parts of isotactic homopolypropylene, 15 parts of polyetherimide, 2 parts of glass fibres, 3 parts of micas, 0.1 part of antioxidant
3,5- di-t-butyl -4- hydroxyl benzyl methyl ethers, 0.05 part of Irgafos168 antioxidant, 2 parts of maleic anhydride modified chlorinated polypropylenes,
0.4 part of CYD-6100,1.0 parts of BN hexagonals mix 5 minutes in high-speed mixer, by uniformly mixed material in double spiral shells
Melting mixing in bar extruder.The melt mix temperature of extruder is set are as follows: and 170 DEG C of conveying section temperature, fluxing zone temperature 190
DEG C, 200 DEG C of metering section temperature；200 revs/min of screw speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Embodiment 2
Weigh 63 parts of isotactic homopolypropylene, 12 parts of polyetherimide, 5 parts of glass fibres, 0.15 part of 3,5- di-t-butyl-
4- hydroxyl benzyl methyl ether antioxidant, 0.10 part of Irgafos168 antioxidant, 3 parts of maleic anhydride modified chlorinated polypropylenes, 0.6 part of CYD-
6100, BN 1.2 parts of hexagonals mix 5 minutes in a high speed mixer, by uniformly mixed material in double screw extruder
Melting mixing.The melt mix temperature of extruder is set are as follows: and 172 DEG C of conveying section temperature, 185 DEG C of fluxing zone temperature, metering section temperature
205 DEG C of degree；200 revs/min of screw speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Embodiment 3
Weigh 70 parts of isotactic homopolypropylene, 10 parts of polyetherimide, 5 parts of glass fibres, 5 parts of micas, 0.15 part 3,5-
Di-t-butyl -4- hydroxyl benzyl methyl ether antioxidant, 0.05 part of Irgafos168 antioxidant, 4 parts of maleic anhydride modified chlorinated polypropylenes,
0.8 part of CYD-6100 0.8 part of BN hexagonal, is mixed 5 minutes, in a high speed mixer by uniformly mixed material in double spiral shells
Melting mixing in bar extruder.The melt mix temperature of extruder is set are as follows: and 170 DEG C of conveying section temperature, fluxing zone temperature 188
DEG C, 200 DEG C of metering section temperature；200 revs/min of screw speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Embodiment 4
Weigh 65 parts of isotactic homopolypropylene, 15 parts of polyetherimide, 0.1 part of antioxidant 3,5- di-t-butyl -4- hydroxyl
Benzyl methyl ether, 0.05 part of Irgafos168 antioxidant, 2 parts of maleic anhydride modified chlorinated polypropylenes, 0.4 part of CYD-6100,1.0 parts of BN
Hexagonal mixes 5 minutes in high-speed mixer, by uniformly mixed material in double screw extruder melting mixing.It squeezes
The melt mix temperature setting of machine out are as follows: 173 DEG C of conveying section temperature, 195 DEG C of fluxing zone temperature, 200 DEG C of metering section temperature；Screw rod
200 revs/min of revolving speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Comparative example 1
Weigh 65 parts of isotactic homopolypropylene, 2 parts of glass fibres, 3 parts of micas, 0.1 part of antioxidant 3,5- di-t-butyl -4-
Hydroxyl benzyl methyl ether, 0.05 part of Irgafos168 antioxidant mix 5 minutes in a high speed mixer, by uniformly mixed material in
Melting mixing in double screw extruder.The melt mix temperature of extruder is set are as follows: and 170 DEG C of conveying section temperature, fluxing zone temperature
190 DEG C, 200 DEG C of metering section temperature；200 revs/min of screw speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Comparative example 2
63 parts of isotactic homopolypropylene, 5 parts of glass fibres are weighed, 0.15 part of 3,5- di-t-butyl -4- hydroxyl benzyl methyl ether resists
Oxygen agent, 0.10 part of Irgafos168 antioxidant, 3 parts of maleic anhydride modified chlorinated polypropylenes, 0.6 part of CYD-6100, BN hexagonal crystal
1.2 parts of body, mix 5 minutes in a high speed mixer, by uniformly mixed material in double screw extruder melting mixing, squeeze out
The melt mix temperature of machine is set are as follows: 172 DEG C of conveying section temperature, 185 DEG C of fluxing zone temperature, 205 DEG C of metering section temperature；Screw rod turns
200 revs/min of speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Comparative example 3
Weigh 65 parts of isotactic homopolypropylene, 12 parts of polyetherimide, 2 parts of glass fibres, 3 parts of micas, 0.1 part of antioxidant
3,5- di-t-butyl -4- hydroxyl benzyl methyl ethers, 0.05 part of Irgafos168 antioxidant, 2 parts of maleic anhydride modified chlorinated polypropylenes,
0.4 part of CYD-6100 is mixed 5 minutes in a high speed mixer, uniformly mixed material is melted in double screw extruder mixed
It closes, the melt mix temperature setting of extruder are as follows: 170 DEG C of conveying section temperature, 190 DEG C of fluxing zone temperature, metering section temperature 200
℃；200 revs/min of screw speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Comparative example 4
Weigh 70 parts of isotactic homopolypropylene, 10 parts of polyetherimide, 5 parts of glass fibres, 5 parts of micas, 0.15 part 3,5-
Di-t-butyl -4- hydroxyl benzyl methyl ether antioxidant, 0.05 part of Irgafos168 antioxidant, 0.8 part of BN hexagonal is in mixed at high speed
It is mixed 5 minutes in machine, by uniformly mixed material, melting mixing, the melt mix temperature of extruder are set in double screw extruder
It is set to: 170 DEG C of conveying section temperature, 190 DEG C of fluxing zone temperature, 200 DEG C of metering section temperature；200 revs/min of screw speed.
After material squeezes out, by underwater cooling and dicing, 23 DEG C of constant temperature, after placing 16 hours, batten is made by injection molding machine, 23
DEG C constant temperature, 50% humidity are tested for the property after placing 48 hours, the results are shown in Table 1.
Each embodiment of table 1 and comparative example properties of product are tested
Observe table 1:
Comparing embodiment 1 can be seen that the present invention is due to joined modifying agent polyimides, phase with 1 test data of comparative example
The BN hexagonal and inorganic filler for holding agent and ultralow dielectric act synergistically, be made modified polypropene dielectric constant it is low,
High-intensitive, good weatherability is still able to maintain good dielectric properties, mechanical performance, flame retardant property and dimensionally stable under adverse circumstances
Property.
Comparing embodiment 2 can be seen that PolyEtherImide is added in the present invention with comparative example 2, greatly improve the resistance to of system
Time property and polyacrylic tensile strength, reduce the shrinking percentage of system.
Comparing embodiment 1 can be seen that BN hexagonal is added in the present invention with comparative example 3, reduce modified polypropene system
Dielectric constant, improve the dielectric properties of material.
Comparing embodiment 3 can be seen that modified by maleic acid anhydride graft chlorinated polypropylene is made jointly with CYD-6100 with comparative example 4
For compatilizer in use, dramatically increasing the compatibility of polyimides and polypropylene matrix surface, make between polymer
Cohesive force enhancing, forms stable structure.It will become apparent from mechanical property, thermal property and the shrinking percentage of modified polypropylene material all
It improves significantly.
Claims (10)
1. a kind of polypropylene material that low-k high-intensity weather-proof high is good, it is characterised in that: by including following parts by weight
Component is prepared:
60-70 parts of polypropylene,
10-30 parts of modifying agent,
0-25 parts of inorganic filler,
0.1-0.3 parts of antioxidant,
2-5 parts of compatilizer,
0.6-1.2 parts of BN hexagonal.
2. polypropylene material according to claim 1, which is characterized in that the polypropylene is selected from isotactic polypropylene, block
One of polypropylene or atactic copolymerized polypropene are a variety of；
Preferably, polypropylene melt flow rate (MFR) under the conditions of 230 DEG C/2.16Kg is 30-50g/10min.
3. polypropylene material according to claim 1 or 2, which is characterized in that the modifying agent is polyetherimide.
4. polypropylene material according to claim 1-3, which is characterized in that the inorganic filler includes glass fibers
Dimension, mica, preferably glass fibre and mica mass ratio are the mixture of 0.5-5:1.
5. polypropylene material according to claim 1-4, which is characterized in that the antioxidant includes primary antioxidant
And auxiliary antioxidant, wherein primary antioxidant accounts for the 60-80% of antioxidant gross mass；The primary antioxidant is Hinered phenols, excellent
It is selected as 3,5- di-t-butyl -4- hydroxyl benzyl methyl ether, the auxiliary antioxidant is phosphite antioxidant, preferably three (2,4-
Di-tert-butyl-phenyl) phosphite antioxidant.
6. polypropylene material according to claim 1-5, which is characterized in that the compatilizer includes maleic anhydride
Graft modification chlorinated polypropylene and optional dendrimer, dendritic polymer CYD-6100, the mass percentage of CYD-6100 is in compatilizer
0-25%, preferably 5-20%；
Preferably, the maleic anhydride grafting ratio of the modified by maleic acid anhydride graft chlorinated polypropylene is 1.50%-3.56%, chlorine contains
Amount is 26.6%-30.0%.
7. a kind of method for preparing any one of claim 1-6 polypropylene material, comprising:
(1) it will be uniformly mixed in the various groups of high-speed mixers that are placed in；
(2) uniformly mixed material is subjected in double screw extruder melting mixing, squeezes out, is granulated up to low-k height
The modified polypropylene material of intensity good weatherability.
8. the method according to the description of claim 7 is characterized in that being first passed through before various component mixing de- in step (1)
Water.
9. method according to claim 7 or 8, which is characterized in that the double screw extruder, screw diameter 50-
65mm, screw rod draw ratio be 25:1-40:1, the melt mix temperature of extruder is set are as follows: 165-180 DEG C of conveying section temperature,
185-195 DEG C of fluxing zone temperature, 190-215 DEG C of metering section temperature；200 turns -220 revs/min of screw speed.
10. the preparation of any one of polypropylene material according to claim 1-6 and claim 7-9 the method
The application of polypropylene material, applied to including 5G parts material, the insulating materials of electric element and high temperature conjunction part neck
Domain.
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| CN114030170A (en) * | 2021-10-09 | 2022-02-11 | 万华化学（宁波）有限公司 | Preparation method of multilayer-structure high-shielding-efficiency reinforced polypropylene composite material |
| CN114030170B (en) * | 2021-10-09 | 2024-02-27 | 万华化学（宁波）有限公司 | Preparation method of multilayer structure high shielding effectiveness reinforced polypropylene composite material |
| 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 |
| CN114539693A (en) * | 2022-03-07 | 2022-05-27 | 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 |
| 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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| CN110437540B (en) | 2022-02-18 |
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