CN116355317A - Polypropylene interior material suitable for vehicle life monitoring system and preparation method thereof - Google Patents
Polypropylene interior material suitable for vehicle life monitoring system and preparation method thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 96
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 96
- -1 Polypropylene Polymers 0.000 title claims abstract description 93
- 239000000463 material Substances 0.000 title claims abstract description 38
- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000003365 glass fiber Substances 0.000 claims abstract description 96
- 239000003381 stabilizer Substances 0.000 claims abstract description 24
- 229920001971 elastomer Polymers 0.000 claims abstract description 19
- 239000000806 elastomer Substances 0.000 claims abstract description 19
- 239000012745 toughening agent Substances 0.000 claims abstract description 19
- 238000012661 block copolymerization Methods 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 16
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 8
- 229920005604 random copolymer Polymers 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 17
- 238000007598 dipping method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000003963 antioxidant agent Substances 0.000 claims description 12
- 230000003078 antioxidant effect Effects 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000000845 anti-microbial effect Effects 0.000 claims description 2
- 239000003063 flame retardant Substances 0.000 claims description 2
- 150000002632 lipids Chemical class 0.000 claims description 2
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical group OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 150000007970 thio esters Chemical class 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 18
- 239000000945 filler Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- XCPFSALHURPPJE-UHFFFAOYSA-N (3,5-ditert-butyl-4-hydroxyphenyl) propanoate Chemical compound CCC(=O)OC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 XCPFSALHURPPJE-UHFFFAOYSA-N 0.000 description 1
- VKJLYEDTHCTCOH-UHFFFAOYSA-N 3-(3-octadecoxy-3-oxopropyl)sulfanylpropanoic acid Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(O)=O VKJLYEDTHCTCOH-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
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- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- C08L23/14—Copolymers of propene
-
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polypropylene interior material suitable for an in-vehicle life monitoring system and a preparation method thereof. The polypropylene material consists of the following raw materials in percentage by weight: 20-85% of high-flow block copolymerized polypropylene; 10-30% of high-impact block copolymerized polypropylene; 0-15% of random copolymer polypropylene; 5-30% of elastomer toughening agent; 5-30% of chopped low dielectric glass fiber; 0-20% of long glass fiber; 0-3% of grafts; 0.1-4% of stabilizer; 0-5% of other additives. The low dielectric glass fiber and the long glass fiber are compounded, so that the material has relatively low dielectric constant, the cost is reduced, and the problem that the impact performance is difficult to improve when only the low dielectric glass fiber exists is solved; the introduction of the high-impact block copolymerization polypropylene and the elastomer toughening agent ensures that the material has excellent impact resistance, and the addition of the random copolymerization polypropylene can further consolidate the impact resistance and improve the elongation at break of the material. Through the formula design, the obtained material can have the characteristics of low dielectric property, high impact resistance and high modulus.
Description
Technical Field
The invention relates to a polypropylene material and a preparation method thereof, and the obtained material has the characteristics of low dielectric constant, good impact resistance and high modulus, and belongs to the technical field of polymer material processing and modification.
Background
In recent years, reports of accidents occurring when infants forget to take place in vehicles are frequent, and thus, some new vehicle models are beginning to be equipped with in-vehicle life monitoring systems. The system is generally composed of an in-vehicle camera and an in-vehicle millimeter wave radar, and for the millimeter wave radar, the millimeter wave radar is generally not exposed like a camera, but covered by an inner decorative plate, so that the inner decorative material is required to have good wave transmission performance. The main scene of the vehicle interior growth monitoring system is that after the vehicle is locked and the window is closed, the vehicle is not powered any more, and the detection system only consumes the original electric quantity of the storage battery, so that the lower the energy consumption of the system is, the better the energy consumption of the system is. The use of an interior material with better transmission capability is beneficial to reducing power consumption while maintaining the signal strength of the monitoring system. In addition, as an automotive interior material, it is necessary to have high impact resistance characteristics when used for manufacturing an a/B/C pillar interior panel in order to meet airbag explosion requirements.
Polypropylene (PP) is a major material used for manufacturing automotive interiors, and the interior concerned includes instrument panels, door panels, a/B/C pillar covers, and the like. The PP has small polarity and low dielectric constant, but the mechanical property of the pure PP generally cannot meet the requirements of automotive interiors, and filler is required to be introduced for modification, so that the dielectric constant of the obtained composite material is increased, and the composite material is unfavorable for wave transmission. In order to minimize the increase in dielectric constant due to the filler, it is preferable to use a low dielectric filler. The most commonly used low dielectric filler at present is low dielectric glass fiber (D glass fiber with dielectric constant of 4-4.5 and 10 GHz), and the impact performance of the glass fiber is difficult to improve after the glass fiber is introduced into PP, so that the impact resistance requirement of an interior material cannot be met. Based on the above, the low dielectric and high impact properties are the main difficulties in preparing the high wave-transparent PP interior material.
Disclosure of Invention
The invention aims to develop a polypropylene interior material suitable for an in-vehicle life monitoring system, and the obtained material can be used for manufacturing automobile interior parts, has good permeability to millimeter radar waves and has excellent shock resistance.
It is a further object of the present invention to provide a process for the preparation of such polypropylene materials.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the polypropylene interior material suitable for the vehicle life detection system comprises the following raw materials in percentage by weight: 20-85% of high-flow block copolymerized polypropylene; 10-30% of high-impact block copolymerized polypropylene; 0-15% of random copolymer polypropylene; 5-30% of elastomer toughening agent; 5-30% of chopped low-dielectric glass fiber (D glass fiber); 0-20% of long glass fiber (E glass fiber); 0-3% of grafts; 0.1-4% of stabilizer; 0-5% of other additives.
In the polypropylene interior material, the polypropylene material is prepared from the polypropylene material,
the melt flow rate of the high-flow block copolymerized polypropylene is 50-100g/10min.
The melt flow rate of the high impact block copolymerized polypropylene is 5-30g/10min.
The melt flow rate of the random copolymer polypropylene is 0.25-20g/10min.
The elastomer toughening agent is ethylene-octene copolymer or ethylene-butene copolymer or the combination of the two, and the density is 0.88-0.91g/cm 3 The melt flow rate is 0.5-25g/10min.
The diameter of the chopped low-dielectric glass fiber is 10 mu m, the chopping length is 3mm, and the dielectric constant (10 GHz) is 4.2-4.3; the diameter of the long glass fiber is 17 mu m, and the dielectric constant (10 GHz) is 6.5-6.6.
The graft is maleic anhydride grafted polypropylene.
The stabilizer is a main antioxidant and an auxiliary antioxidant considered to be needed by a person skilled in the art, wherein the main antioxidant is a hindered phenol or thioester antioxidant, and the auxiliary antioxidant is a phosphite or lipid antioxidant.
The other additives are one or a combination of a plurality of toner, flame retardant, antistatic auxiliary agent, surfactant, plasticizer and antimicrobial auxiliary agent which are considered to be needed by the person skilled in the art.
The preparation method of the polypropylene interior material suitable for the vehicle life detection system comprises the following specific steps:
(1) Adding part of high-flow block copolymerization polypropylene, grafts and stabilizer into an extruder in proportion, and outputting the mixture to a dipping device after shearing and melting. The long glass fiber also enters an impregnating device through auxiliary equipment, is fully impregnated by melt, and is cooled and granulated to obtain long glass fiber reinforced polypropylene master batch;
(2) Fully mixing the rest high-flow block copolymerization polypropylene, high-impact block copolymerization polypropylene, random copolymerization polypropylene, elastomer toughening agent, grafts, stabilizing agent and other additives in a high-speed mixer according to a proportion, then adding the mixture into a double-screw extruder from a main feeding port of a screw, adding low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
The invention has the advantages that:
1. the low dielectric glass fiber (D glass fiber) and the common long glass fiber (E glass fiber) can be compounded to avoid the problem that the impact performance is difficult to improve when only the D glass fiber exists. In addition, although the addition of only D glass fiber is beneficial to the reduction of the dielectric constant of the material, the cost of the filler is relatively high, so that the addition of a certain proportion of common E glass fiber is beneficial to the reduction of the cost on the premise of ensuring that the material has relatively low dielectric constant.
2. The introduction of the high impact block copolymerized polypropylene and the elastomer toughening agent enables the material to have excellent impact resistance. The random copolymerization polypropylene with weaker crystallization capability is additionally added, so that crystallization can be weakened, the spherulitic size can be reduced, the compatibility and interfacial bonding capability of the polypropylene and the elastomer toughening agent can be improved, and the impact resistance of the material can be further consolidated, and meanwhile, the elongation at break can be improved.
3. The long glass fiber and part of high-flow block copolymerization polypropylene are made into master batch, then the low dielectric glass fiber and the rest components are extruded and granulated, and finally the master batch containing the long glass fiber and the granules containing the low dielectric glass fiber are evenly mixed for injection molding, so that the long glass fiber is prevented from being damaged by secondary extrusion and granulation, and the glass fiber length is maintained to the maximum extent.
Detailed Description
The present invention will be described in further detail by way of examples and comparative examples, which are not intended to limit the scope of the invention.
In the composite formulations of the examples and comparative examples, the high flow block copolymer polypropylene used had a melt flow rate of about 100g/10min, the high impact block copolymer polypropylene had a melt flow rate of about 30g/10min, and the random copolymer polypropylene had a melt flow rate of about 0.25g/10min.
The elastomer toughening agent used was an ethylene-butene copolymer POE 7467 with a melt flow rate of about 1.2g/10min.
The diameter of the low dielectric glass fiber (D glass fiber) is 10 mu m, the short cut length is 3mm, and the dielectric constant (10 GHz) is 4.2-4.3.
The diameter of the long glass fiber (E glass fiber) is 17 mu m, the dielectric constant (10 GHz) is 6.5-6.6, and the length after being cut is 3mm.
The stabilizers used were Neganox DSTP (chemical name: stearyl thiodipropionate) from ICE, irganox 1010 (chemical name: pentaerythritol tetrakis (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate) from Ciba and Irgafos 168 (chemical name: tris (2, 4-di-tert-butylphenyl) phosphite) from Ciba in the ratio of 3:1:1.
The other additive used was toner (black).
Example 1
(1) 5% of high-flow block copolymerized polypropylene, 0.5% of graft and 0.5% of stabilizer are added into an extruder in proportion, and are output into a dipping device after being sheared and melted. 5% of the long glass fiber also enters the dipping device through auxiliary equipment, is fully dipped by melt, and is cooled and granulated to obtain the long glass fiber reinforced polypropylene master batch.
(2) The preparation method comprises the steps of fully mixing 26% of high-flow block copolymerized polypropylene, 13% of high-impact block copolymerized polypropylene, 7% of random copolymerized polypropylene, 25% of elastomer toughening agent, 1.5% of graft, 0.5% of stabilizer and 1% of other additives in a high-speed mixer in proportion, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 15% of low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
Example 2
(1) 6% of high-flow block copolymerized polypropylene, 0.5% of graft and 0.5% of stabilizer are added into an extruder in proportion, and are output into a dipping device after being sheared and melted. 6% of the long glass fiber also enters the dipping device through auxiliary equipment, is fully dipped by melt, and is cooled and granulated to obtain the long glass fiber reinforced polypropylene master batch.
(2) The preparation method comprises the steps of fully mixing 26% of high-flow block copolymerized polypropylene, 13% of high-impact block copolymerized polypropylene, 7% of random copolymerized polypropylene, 25% of elastomer toughening agent, 1.5% of graft, 0.5% of stabilizer and 1% of other additives in a high-speed mixer in proportion, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 13% of low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
Example 3
(1) 8% of high-flow block copolymerized polypropylene, 0.5% of graft and 0.5% of stabilizer are added into an extruder in proportion, and are output into a dipping device after being sheared and melted. And 8% of the long glass fiber also enters the impregnating device through auxiliary equipment, is fully impregnated by melt, and is cooled and granulated to obtain the long glass fiber reinforced polypropylene master batch.
(2) The preparation method comprises the steps of fully mixing 25% of high-flow block copolymerization polypropylene, 13% of high-impact block copolymerization polypropylene, 7% of random copolymerization polypropylene, 25% of elastomer toughening agent, 1.5% of graft, 0.5% of stabilizer and 1% of other additives in a high-speed mixer in proportion, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 10% of low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
Example 4
(1) 6% of high-flow block copolymerized polypropylene, 0.5% of graft and 0.5% of stabilizer are added into an extruder in proportion, and are output into a dipping device after being sheared and melted. 6% of the long glass fiber also enters the dipping device through auxiliary equipment, is fully dipped by melt, and is cooled and granulated to obtain the long glass fiber reinforced polypropylene master batch.
(2) Mixing high-flow block copolymerization polypropylene 26%, high-impact block copolymerization polypropylene 18%, random copolymerization polypropylene 7%, elastomer toughening agent 20%, graft 1.5%, stabilizer 0.5% and other additives 1% in a high-speed mixer, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding low-dielectric glass fiber 13% into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
Comparative example 1
The preparation method comprises the steps of fully mixing 32% of high-flow block copolymerized polypropylene, 13% of high-impact block copolymerized polypropylene, 7% of random copolymerized polypropylene, 25% of elastomer toughening agent, 2% of graft, 1% of stabilizer and 1% of other additives in a high-speed mixer in proportion, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 13% of low-dielectric glass fiber and 6% of short-cut E glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
Comparative example 2
(1) 6% of high-flow block copolymerized polypropylene, 0.5% of graft and 0.5% of stabilizer are added into an extruder in proportion, and are output into a dipping device after being sheared and melted. 6% of the long glass fiber also enters the dipping device through auxiliary equipment, is fully dipped by melt, and is cooled and granulated to obtain the long glass fiber reinforced polypropylene master batch.
(2) Fully mixing 26% of high-flow block copolymerization polypropylene, 13% of high-impact block copolymerization polypropylene, 7% of random copolymerization polypropylene, 25% of elastomer toughening agent, 1.5% of graft, 0.5% of stabilizer and 1% of other additives in a high-speed mixer, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 13% of low-dielectric glass fiber and the long glass fiber reinforced masterbatch obtained in the step (1) into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
Comparative example 3
The preparation method comprises the steps of fully mixing 31% of high-flow block copolymerization polypropylene, 13% of high-impact block copolymerization polypropylene, 7% of random copolymerization polypropylene, 25% of elastomer toughening agent, 2% of graft, 1% of stabilizer and 1% of other additives in a high-speed mixer in proportion, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 20% of low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
Comparative example 4
(1) 6% of high-flow block copolymerized polypropylene, 0.5% of graft and 0.5% of stabilizer are added into an extruder in proportion, and are output into a dipping device after being sheared and melted. 6% of the long glass fiber also enters the dipping device through auxiliary equipment, is fully dipped by melt, and is cooled and granulated to obtain the long glass fiber reinforced polypropylene master batch.
(2) The method comprises the steps of fully mixing 26% of high-flow block copolymerized polypropylene, 20% of high-impact block copolymerized polypropylene, 25% of elastomer toughening agent, 1.5% of graft, 0.5% of stabilizer and 1% of other additives in a high-speed mixer in proportion, adding the mixture into a double-screw extruder from a main feeding port of a screw, adding 13% of low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa.
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
The performance evaluation mode is as follows:
the tensile property test was carried out according to ISO 527-2, the dimensions of the test specimen being 170mm by 10mm by 4mm; bending performance test was performed according to ISO 178, sample size 80mm 10mm 4mm, bending speed 2mm/min, span 64mm; the notched impact test of the simply supported beam is carried out according to the ISO 179-1 standard, the size of a sample is 80mm multiplied by 10mm multiplied by 4mm, and the depth of a notch is one third of the thickness of the sample; the dielectric test uses a split dielectric resonator (SPDR) method, frequency 10GHz.
The weight percentages of the main components of each example and comparative example are shown in Table 1, and the corresponding performance test results are shown in Table 2.
TABLE 1 Material composition (weight percent) for comparative examples 1-4 and examples 1-4
TABLE 2 results of Material Performance test for comparative examples 1-4 and examples 1-4
For comparative example 1, comparative example 2 and example 2: the E glass fiber used in comparative example 1 is chopped glass fiber; the E glass fiber used in the comparative example 2 is long glass fiber, but the master batch containing the E glass fiber also undergoes side feeding and secondary extrusion during preparation, and the length of the glass fiber is lost compared with that of the master batch; the E glass fiber used in example 2 is long glass fiber, and the master batch containing the E glass fiber does not undergo side feeding during preparation, but is uniformly mixed with the D glass fiber after pelletization of the D glass fiber and other components is completed, so that the length of the final E glass fiber is relatively less than that of the master batch. Because the physical states of the E glass fibers are different, the rigidity (tensile strength, flexural modulus) of example 2 is relatively strongest among the three, comparative example 2 is weakest, comparative example 1 is weakest, and the physical states of the E glass fibers do not affect the dielectric properties, so that the dielectric constants and dielectric losses of the three are not significantly different. For comparative example 3, since it contains only D glass fiber, both the dielectric constant and dielectric loss are lower than those of the other groups, but there is no advantage in both the rigidity and toughness. For comparative example 4, it does not contain random copolymer polypropylene, which results in a very disadvantageous in terms of elongation at break. Comparative examples 1 to 4: the polyolefin elastomer content in example 4 was relatively minimal, and thus had a certain disadvantage in impact properties and elongation at break; an increase in the E glass fiber ratio results in an increase in the dielectric constant and dielectric loss, so that example 1 is best at low dielectric, examples 2 and 4 times, example 3 is worst-in combination with cost, mechanical properties and low dielectric requirements, example 2 is relatively more balanced.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.
Claims (8)
1. The polypropylene interior material suitable for the vehicle life monitoring system is characterized by comprising the following raw materials in percentage by weight: 20-85% of high-flow block copolymerized polypropylene; 10-30% of high-impact block copolymerized polypropylene; 0-15% of random copolymer polypropylene; 5-30% of elastomer toughening agent; 5-30% of chopped low-dielectric glass fiber (D glass fiber); 0-20% of long glass fiber (E glass fiber); 0-3% of grafts; 0.1-4% of stabilizer; 0-5% of other additives.
2. A polypropylene interior trim material suitable for use in an in-vehicle life monitoring system according to claim 1, wherein: the melt flow rate of the high-flow block copolymerization polypropylene is 50-100g/10min; the melt flow rate of the high-impact block copolymerization polypropylene is 5-30g/10min; the melt flow rate of the random copolymer polypropylene is 0.25-20g/10min.
3. A polypropylene interior trim material suitable for use in an in-vehicle life monitoring system according to claim 1, wherein: the elastomer toughening agent is ethylene-octene copolymer or ethylene-butene copolymer or the combination of the two, and the density is 0.88-0.91g/cm 3 The melt flow rate is 0.5-25g/10min.
4. A polypropylene interior trim material suitable for use in an in-vehicle life monitoring system according to claim 1, wherein: the diameter of the chopped low-dielectric glass fiber is 10 mu m, the chopping length is 3mm, and the dielectric constant (10 GHz) is 4.2-4.3; the diameter of the long glass fiber is 17 mu m, and the dielectric constant (10 GHz) is 6.5-6.6.
5. A polypropylene interior trim material suitable for use in an in-vehicle life monitoring system according to claim 1, wherein: the graft is maleic anhydride grafted polypropylene.
6. A polypropylene interior trim material suitable for use in an in-vehicle life monitoring system according to claim 1, wherein: the stabilizer is a main antioxidant and an auxiliary antioxidant considered to be needed by a person skilled in the art, wherein the main antioxidant is a hindered phenol or thioester antioxidant, and the auxiliary antioxidant is a phosphite or lipid antioxidant.
7. A polypropylene interior trim material suitable for use in an in-vehicle life monitoring system according to claim 1, wherein: the other additives are one or a combination of a plurality of toner, flame retardant, antistatic auxiliary agent, surfactant, plasticizer and antimicrobial auxiliary agent which are considered to be needed by the person skilled in the art.
8. The method for producing a polypropylene interior material suitable for use in an in-vehicle environment monitoring system according to any one of claims 1 to 7, comprising the steps of:
(1) Adding part of high-flow block copolymerization polypropylene, grafts and stabilizer into an extruder in proportion, and outputting the mixture to a dipping device after shearing and melting. The long glass fiber also enters an impregnating device through auxiliary equipment, is fully impregnated by melt, and is cooled and granulated to obtain long glass fiber reinforced polypropylene master batch;
(2) Fully mixing the rest high-flow block copolymerization polypropylene, high-impact block copolymerization polypropylene, random copolymerization polypropylene, elastomer toughening agent, grafts, stabilizing agent and other additives in a high-speed mixer according to a proportion, then adding the mixture into a double-screw extruder from a main feeding port of a screw, adding low-dielectric glass fiber into the double-screw extruder from a lateral feeding port in the middle of the screw, and cooling and granulating after melt extrusion, wherein the process comprises the following steps: 190-200 ℃ in the first region, 200-210 ℃ in the second region, 210-220 ℃ in the third region and 205-215 ℃ in the fourth region; the residence time is 1-2min, and the pressure is 12-18MPa;
(3) And (3) fully mixing the long glass fiber reinforced master batch obtained in the two steps and granules containing low dielectric glass fibers in a high-speed mixer, and then using the mixture for injection molding.
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