CN115850870B - Polypropylene modified insulating material and preparation method thereof - Google Patents
Polypropylene modified insulating material and preparation method thereof Download PDFInfo
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- CN115850870B CN115850870B CN202310190245.4A CN202310190245A CN115850870B CN 115850870 B CN115850870 B CN 115850870B CN 202310190245 A CN202310190245 A CN 202310190245A CN 115850870 B CN115850870 B CN 115850870B
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- 229920001155 polypropylene Polymers 0.000 title claims abstract description 140
- 239000011810 insulating material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 11
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- HCILJBJJZALOAL-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)-n'-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 HCILJBJJZALOAL-UHFFFAOYSA-N 0.000 claims description 2
- 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 claims description 2
- 229920001971 elastomer Polymers 0.000 abstract description 13
- 230000015556 catabolic process Effects 0.000 abstract description 12
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 10
- 229910052901 montmorillonite Inorganic materials 0.000 description 10
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- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a polypropylene modified insulating material and a preparation method thereof, wherein the polypropylene modified insulating material comprises the following preparation raw materials in parts by mass: polypropylene a:20-40 parts of polypropylene B:30-60 parts of an elastomer: 15-30 parts of modified resin: 5-10 parts of compatilizer: 5-10 parts of antioxidant: 0.8-1.5 parts of processing aid: 0.5-1 part. The invention further discloses a preparation method of the polypropylene modified insulating material. The invention carries out blending modification on polypropylene, utilizes the higher melting crystallization temperature and excellent dielectric property of polypropylene, and solves the problems of poor low-temperature performance, too strong rigidity and poor toughness of polypropylene and the problem of thermal oxygen degradation easily occurring in the processing process of polypropylene by modifying the physical structure of polypropylene without adding a crosslinking agent.
Description
Technical Field
The invention relates to a polypropylene modified insulating material, in particular to a polypropylene modified insulating material and a preparation method thereof.
Background
The polypropylene modified insulating material is a novel cable material applicable to medium-high voltage power cable insulating layers of 10kV and above, has the advantages of simple processing technology, low energy consumption, low emission, recoverability and the like, has obvious advantages compared with the crosslinked polyethylene insulating material widely used at present, and is a medium-high voltage power cable updating product.
CN113999457a discloses an environment-friendly polypropylene-based insulating material, which is obtained by adopting polypropylene, SEBS and antioxidant, but has poor low temperature resistance. CN103589105a discloses a method for preparing modified polypropylene insulating material from components of polypropylene resin, polyolefin elastomer rubber, antioxidant and the like, wherein the insulating material has good high and low temperature resistance, but the insulating material has over-strong rigidity and poor toughness, and is easy to cause thermal oxygen degradation in the processing process.
In order to solve the problems, the invention carries out blending modification on polypropylene, utilizes the higher melting crystallization temperature and excellent dielectric property of polypropylene, and solves the problems of poor low-temperature performance, too strong rigidity and poor toughness of polypropylene and the problem of thermal oxygen degradation easily occurring in the processing process of polypropylene by modifying the physical structure of polypropylene without adding a crosslinking agent.
Disclosure of Invention
The invention provides a polypropylene modified insulating material, which is prepared from the following raw materials in parts by mass: polypropylene a:20-40 parts of polypropylene B:30-60 parts of an elastomer: 15-30 parts of modified resin: 5-10 parts of compatilizer: 5-10 parts of antioxidant: 0.8-1.5 parts of processing aid: 0.5-1 part.
Further, the polypropylene A and the polypropylene B are low-melt copolymerized polypropylene.
Further, the melt flow rate of the polypropylene A is 2-5g/10min, the test temperature is 230 ℃, and the test pressure is 2.16kg weight.
Further, the polypropylene A is selected from any one of the models k7003, k1003, EP200K, EPS30RA, B4902.
Further, the polypropylene B is a weight with a melt flow rate of 1-2g/10min, a test temperature of 230 ℃ and a test pressure of 2.16 kg.
Further, the polypropylene B is selected from any one of the models k8303, 1340P.
The applicant finds that the polypropylene modified insulating material is applied to medium-high voltage cables in the experimental process, has good insulating property, simple processing technology and no need of high-temperature crosslinking, and can be recycled after use, but the applicant finds that the problem of thermal degradation easily occurs in the processing process by adopting single polypropylene as a base material, and the degraded polypropylene is equivalent to introduced impurities in the insulating material, and is easy to cause electric field breakdown at medium-high voltage, so that the dielectric property is reduced. Applicants creatively found that the heat degradation resistance of polypropylene base stock can be improved by adopting polypropylene with a melt index of 2-5g/10min to co-act with polypropylene with a melt index of 1-2g/10min, and the possible reasons are suspected as follows: the heat transfer between polypropylene phases with different melt indexes can reduce the thermal oxidation of high temperature to polypropylene chain molecules, so that the polypropylene molecules cannot reach the thermal degradation temperature, and the thermal oxidative decomposition of the polypropylene molecules is avoided. The applicant further discovers that the combined action of the two polypropylenes can improve the mechanical property of the polypropylene matrix, and the polypropylenes with different melt indexes form irregular molecular morphology in a molten state, so that the polypropylene matrix has certain morphological stability.
Further, the elastomer is polyolefin elastomer POE.
Further, the POE is an ethylene-octene high polymer, the melt index of the POE is 1-5g/10min, the test temperature is 190 ℃, and the test pressure is 2.16kg weight.
Further, the POE model is any one of POE9500, POE8003, DF840 and H1030S.
The modified resin is selected from one or more of ethylene-vinyl acetate copolymer and ethylene propylene diene monomer.
In a preferred embodiment, the modified resin is an ethylene-vinyl acetate copolymer, such as any of EVA1826, 7470M, EPDM 3722P.
Further, the weight ratio of POE to ethylene-vinyl acetate copolymer is (15-30): (5-10).
In the experimental process, the applicant finds that the polypropylene base material has higher hardness and poorer toughness and poor application performance in the cable field, and the applicant can remarkably improve the mechanical performance of the polyethylene insulating material by introducing an elastomer and a modified resin for blending modification, and the possible reasons are hypothesized to be: the ethylene and vinyl acetate have higher flexibility in molecular structure, the introduction of POE and ethylene-vinyl acetate copolymer not only damages the crystallization area of the polypropylene base material, but also further increases the toughness of the polypropylene insulating material, reduces the elastic modulus and obviously improves the flexibility. The applicant further found that by introducing POE and ethylene-vinyl acetate copolymer to generate sites for trapping charges, the carriers released by ionization of impurities and homopolar charges injected by electrodes under a direct current field can be captured, movement of the carriers is hindered, formation of heteropolar charges is inhibited, and accordingly accumulation of space charges in a polypropylene base material can be effectively inhibited, breakdown field intensity is improved, and the effect of further improving insulation performance of the polypropylene base material is achieved. The applicant has further found that when POE is used with ethylene-vinyl acetate copolymer (15-30): when the weight ratio is (5-10), the polypropylene insulating material has good compatibility, the compatibility effect of the polypropylene insulating material is obviously reduced beyond the preferable weight ratio range, the island effect is generated between the molten phases, the stress defect is generated, and the mechanical property of the polypropylene insulating material is reduced.
The compatilizer is maleic anhydride modified polypropylene.
The antioxidant is one or more selected from antioxidant 300, antioxidant 1010, antioxidant 1035 and antioxidant 1024.
In a preferred embodiment, the antioxidant is selected from the group consisting of antioxidants 300.
The processing aid is selected from one of nano silicon dioxide, nano aluminum oxide, nano montmorillonite and the like.
Further, the processing aid is nano montmorillonite.
Further, the nano montmorillonite is double long chain alkyl ammonium modified montmorillonite.
The double long chain alkyl ammonium modified montmorillonite is purchased from Zhejiang Feng hong New Material Co., ltd, and the model is DK7.
Further, the nano montmorillonite has a particle size of less than 20 μm.
In the experimental process, the applicant finds that the insulating property of the polypropylene insulating material can be reduced under the high-temperature and high-voltage environment, the barrier property of the medium-high voltage is poor, and the applicant finds that the insulating property of the polypropylene insulating material can be obviously improved by adopting nano montmorillonite as a processing aid to be doped into the polypropylene base material, and the possible reasons are as follows: a large number of deep trap energy levels are introduced at the microcosmic interface of the nano particles and the polypropylene matrix material, the deep trap energy levels can capture carriers moving at high speed, the carrier mobility is reduced, meanwhile, the captured charges can improve the electric field distribution near the electrode, and the insulation performance is improved. However, the applicant found that when the particle size of the nano montmorillonite is larger than 20 μm, the nano montmorillonite is unevenly distributed in the polypropylene base material, and the nano montmorillonite is difficult to stably exist in the polypropylene base material for a long time, and can migrate along with the extension of the service time, so that the performance is reduced. The applicant further discovers in experiments that the adoption of the double long-chain alkyl ammonium modified montmorillonite and the polypropylene base material doping can reduce the agglomeration of nano montmorillonite on the basis of maintaining the uniform dispersion of the montmorillonite, and the reason is probably that the repulsive force between molecules of the double long-chain alkyl ammonium modified montmorillonite is larger, the surface energy is higher when the double long-chain alkyl ammonium modified montmorillonite is used, and the agglomeration is not easy to concentrate between molecules.
The invention also discloses a preparation method of the polypropylene modified insulating material, which comprises the following steps:
(1) Blending 50-100 parts of polypropylene, 15-30 parts of elastomer, 5-10 parts of modified resin, 0.8-1.5 parts of antioxidant, 5-10 parts of compatilizer and 0.5-1 part of processing aid according to parts by mass, mixing by using a double screw, detecting melting temperature in the process, monitoring mixing modification process in real time, and extruding by using a single screw;
(2) And (3) conveying the single-screw extruded material to a granulator, dehydrating by a dehydrator, entering a cyclone separator, boiling, drying, and discharging to obtain the material.
The processing temperature in the mixing process in the step (1) is as follows: the temperature is 150-240 ℃ and is divided into 11 temperature areas, the time of the mixing process is 2-5min, and the rotating speed is 190-210rpm.
The moisture content after dehydration in step (2) is generally not more than 0.03%.
The weight ratio of the polypropylene to the elastomer to the modified resin is (50-100): (15-30): (5-10).
The applicant found during the experiment that when the weight ratio of polypropylene to elastomer and modified resin is (50-100): (15-30): (5-10), the impact resistance of the polypropylene insulating material in the low-temperature environment of-25 ℃ can be obviously improved, and the possible reasons are suspected to be: in the preferred weight ratio range, the introduction of the elastomer POE and the modified resin ethylene-vinyl acetate copolymer can damage the crystallinity of the polypropylene, reduce the hardness of the polypropylene, improve the toughness of the polypropylene insulation material, and can perform stress dispersion and reduce the damage of impact force to the polypropylene insulation material when the polypropylene insulation material is impacted outside in a low-temperature environment. The applicant has further found that when the weight ratio is outside the preferred range, the polypropylene insulation is easily decomposed and destroyed during processing and production, which adversely affects mechanical properties. And the applicant found that when the addition amount of the elastomer and the modified resin is too high, the density of trapping charge sites is increased, the relative distance between the sites is reduced, carriers are easily transferred between adjacent sites by head-tail connection, the effect of blocking the movement of the carriers is not achieved, and the insulation performance of the polypropylene insulation material is reduced.
The beneficial effects are that:
1. the invention adopts the combined action of the polypropylene with the melt index of 2-5g/10min and the polypropylene with the melt index of 1-2g/10min to improve the heat resistance of the polypropylene modified insulating material and the mechanical property of the insulating material, so that the insulating material has certain form stability.
2. The invention adds the double long chain alkyl ammonium modified montmorillonite with the grain diameter smaller than 20 mu m, improves the resistivity of the polypropylene modified insulating material and inhibits the current leakage.
3. The weight ratio of POE to ethylene-vinyl acetate copolymer is controlled to be (15-30): (5-10), improving mechanical properties, improving toughness of the polypropylene insulating material, reducing elastic modulus, and avoiding the problem of easy rigid and brittle fracture in the cable processing and using process.
4. The weight ratio of polypropylene to elastomer to modified resin is controlled to be (50-100): (15-30): (5-10), improving impact resistance in low temperature environment, and reducing impact failure number in-25 ℃.
5. The invention carries out blending modification on polypropylene, utilizes the higher melting crystallization temperature and excellent dielectric property of polypropylene, and solves the problems of poor low-temperature performance, too strong rigidity and poor toughness of polypropylene and the problem of thermal oxygen degradation easily occurring in the processing process of polypropylene by modifying the physical structure of polypropylene without adding a crosslinking agent.
Detailed Description
Example 1
The embodiment 1 of the invention discloses a polypropylene modified insulating material, which is prepared from the following raw materials in parts by weight: polypropylene a:188.1 g, polypropylene B:564.4 g, ethylene-octene high polymer: 141.1 g, ethylene-vinyl acetate copolymer: 47 g, maleic anhydride modified polypropylene: 47 g, antioxidant: 7.5g, double long chain alkyl ammonium modified montmorillonite: 4.7 g.
The polypropylene A is purchased from Yanshan petrochemical industry and has the model number of k7003.
The polypropylene B was purchased from Yanshan petrochemical, model k8303.
The ethylene-octene high polymer was purchased from thailand dow company under the model POE9500.
The ethylene-vinyl acetate copolymer was purchased from korea Han Hua, type EVA1826.
The maleic anhydride modified polypropylene is purchased from Dongguan good-quality plastic raw material Co., ltd, and the model is Orevac 18722.
The antioxidant is purchased from Nanjing Milan chemical industry Co., ltd, and the model is MIANOX300.
The double long chain alkyl ammonium modified montmorillonite is purchased from Zhejiang Feng hong New Material Co., ltd, and the model is DK7.
The embodiment 1 of the invention on the other hand discloses a preparation method of a polypropylene modified insulating material, which comprises the following steps:
(1) Blending polypropylene A, polypropylene B, ethylene-octene high polymer, ethylene-vinyl acetate copolymer, maleic anhydride modified polypropylene, antioxidant and double long chain alkyl ammonium modified montmorillonite, mixing by using a double screw, detecting the melting temperature in the process, monitoring the reaction progress in real time, and extruding by using a single screw;
the processing temperature is 160-180-200-210-220-230-210-190-180-170 ℃, the time of the mixing process is 4min, and the rotating speed is 200rpm.
(2) And (3) conveying the single-screw extruded material to a granulator, dehydrating by a dehydrator, entering a cyclone separator, boiling, drying, and discharging to obtain the material.
The moisture content after dehydration was <0.03%.
Example 2
The embodiment 2 of the invention discloses a polypropylene modified insulating material, which is prepared from the following raw materials in part by weight: polypropylene a:326.5 g, polypropylene B:244.9 g, ethylene-octene high polymer: 244.9 g, ethylene-vinyl acetate copolymer: 81.6 g, maleic anhydride modified polypropylene: 81.6 g, antioxidant: 12.2 g, double long chain alkyl ammonium modified montmorillonite: 8.2 g.
The polypropylene A is purchased from Yanshan petrochemical industry and has the model number of k7003.
The polypropylene B was purchased from Yanshan petrochemical, model k8303.
The ethylene-octene high polymer was purchased from thailand dow company under the model POE9500.
The ethylene-vinyl acetate copolymer was purchased from korea Han Hua, type EVA1826.
The maleic anhydride modified polypropylene is purchased from Dongguan good-quality plastic raw material Co., ltd, and the model is Orevac 18722.
The antioxidant is purchased from Nanjing Milan chemical industry Co., ltd, and the model is MIANOX300.
The double long chain alkyl ammonium modified montmorillonite is purchased from Zhejiang Feng hong New Material Co., ltd, and the model is DK7.
The embodiment 2 of the invention on the other hand discloses a preparation method of a polypropylene modified insulating material, which comprises the following steps:
(1) Blending polypropylene A, polypropylene B, ethylene-octene high polymer, ethylene-vinyl acetate copolymer, maleic anhydride modified polypropylene, antioxidant and double long chain alkyl ammonium modified montmorillonite, mixing by using a double screw, detecting the melting temperature in the process, monitoring the reaction progress in real time, and extruding by using a single screw;
the processing temperature is 160-180-200-210-220-230-210-190-180-170 ℃, the time of the mixing process is 4min, and the rotating speed is 200rpm.
(2) And (3) conveying the single-screw extruded material to a granulator, dehydrating by a dehydrator, entering a cyclone separator, boiling, drying, and discharging to obtain the material.
The moisture content after dehydration was <0.03%.
Example 3
The embodiment 3 of the invention discloses a polypropylene modified insulating material, which is prepared from the following raw materials in part by weight: polypropylene a:266.2g, polypropylene B:399.3g, ethylene-octene high polymer: 177.5g, ethylene-vinyl acetate copolymer: 71g, maleic anhydride modified polypropylene: 71g, antioxidant: 8.9g, double long chain alkyl ammonium modified montmorillonite: 6.2 g.
The polypropylene A is purchased from Yanshan petrochemical industry and has the model number of k7003.
The polypropylene B was purchased from Yanshan petrochemical, model k8303.
The ethylene-octene high polymer was purchased from thailand dow company under the model POE9500.
The ethylene-vinyl acetate copolymer was purchased from korea Han Hua, type EVA1826.
The maleic anhydride modified polypropylene is purchased from Dongguan good-quality plastic raw material Co., ltd, and the model is Orevac 18722.
The antioxidant is purchased from Nanjing Milan chemical industry Co., ltd, and the model is MIANOX300.
The double long chain alkyl ammonium modified montmorillonite is purchased from Zhejiang Feng hong New Material Co., ltd, and the model is DK7.
The embodiment 3 of the invention on the other hand discloses a preparation method of a polypropylene modified insulating material, which comprises the following steps:
(1) Blending polypropylene A, polypropylene B, ethylene-octene high polymer, ethylene-vinyl acetate copolymer, maleic anhydride modified polypropylene, antioxidant and double long chain alkyl ammonium modified montmorillonite, mixing by using a double screw, detecting the melting temperature in the process, monitoring the reaction progress in real time, and extruding by using a single screw;
the processing temperature is 160-180-200-210-220-230-210-190-180-170 ℃, the time of the mixing process is 4min, and the rotating speed is 200rpm.
(2) And (3) conveying the single-screw extruded material to a granulator, dehydrating by a dehydrator, entering a cyclone separator, boiling, drying, and discharging to obtain the material.
The moisture content after dehydration was <0.03%.
Comparative example 1
The polypropylene A was obtained from Shenzhen, inc., model GBW (E) 130164, melt flow rate of 1.70g/10min, and the polypropylene B was obtained from Shenzhen, inc., model GBW (E) 130098, melt flow rate of 7.30g/10min, and the remainder was as in example 3.
Comparative example 2
The double long chain alkyl ammonium modified montmorillonite was replaced with gas phase nano silicon dioxide powder with a particle size of 5-30 μm, and purchased from Hangzhou Hengge nanotechnology Co., ltd., model number of HN-SQ15, and the rest was the same as in example 3.
Comparative example 3
The preparation raw materials of the polypropylene modified insulating material are as follows: polypropylene a:273.5 g, polypropylene B:410.2 g, PVC elastomer: 91.2 g, rosin modified phenolic resin: 136.7 g, maleic anhydride modified polypropylene: 72.9 g, antioxidant: 9.1 g, double long chain alkyl ammonium modified montmorillonite: 6.4 g. The PVC elastomer is purchased from Zhejiang Jin Lida New Material technology Co., ltd, and the model is MG701-7AB3053; the rosin modified phenolic resin was purchased from Jiangsu Pu Le Si Biotech Co., ltd, model MP2101 and the rest was as in example 3.
Performance test:
the polypropylene modified insulating materials prepared in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance test by the following test methods, and the test results are tabulated.
1. Volume resistivity (20 ℃): the DC volume resistivity of the test sample at 20℃was characterized using a three electrode rheometer. In the test, a DC electric field of 40 kV/mm was applied to the test piece 1 h, and the test results are shown in Table 1.
2. Breakdown field strength (20 ℃): the dc breakdown strength test of the samples at 20 ℃ was performed using a dielectric strength tester according to international standard IEC 60243. A DC voltage was applied to the test pieces at a step-up rate of 1 kV/s by a linear step-up method until breakdown of the test pieces occurred, and the test results are shown in Table 1.
3. Low temperature impact test (-25 ℃): after 50 parallel samples were taken and placed in a-25 ℃ low temperature box at 24 h, the samples were placed on an impact tester in turn, the hammers were dropped from a height of 100mm, the number of breaks was recorded, and the test results were counted in table 1.
4. Tensile strength: tensile testing was performed using an electronic universal tester at 20℃according to GB/T2951.11-2008, the results of which are shown in Table 2 below.
5. Elongation at break: tensile testing was performed using an electronic universal tester at 20℃according to GB/T2951.11-2008, the results of which are shown in Table 2 below.
6. Tensile strength change rate: the tensile strength after aging was measured according to GB/T2951.11-2008 standard, the rate of change of tensile strength = (tensile strength after aging-tensile strength before aging)/tensile strength before aging was 100%, and the calculation results are shown in table 2 below. ( The aging conditions are as follows: air box heat aging at 135 deg.c for 168 hr )
7. Elongation at break change rate: the elongation at break after aging was measured according to GB/T2951.11-2008 standard, and the elongation at break change rate= (elongation at break after aging-elongation at break before aging)/elongation at break before aging was 100%, and the calculation results are shown in table 2 below. ( The aging conditions are as follows: air box heat aging at 135 deg.c for 168 hr )
TABLE 1
TABLE 2
Claims (2)
1. The polypropylene modified insulating material is characterized by comprising the following raw materials in parts by mass: polypropylene a:266.2g, polypropylene B:399.3g, ethylene-octene high polymer: 177.5g of ethylene-vinyl acetate copolymer: 71g, maleic anhydride modified polypropylene: 71g, antioxidant: 8.9g of double long chain alkyl ammonium modified montmorillonite: 6.2g;
the polypropylene A and the polypropylene B are low-melting copolymerized polypropylene; the polypropylene A is purchased from Yanshan petrochemical industry and has the model number of k7003; the polypropylene B is purchased from Yanshan petrochemical industry, and the model k8303;
the ethylene-vinyl acetate copolymer is EVA1826; the model of the maleic anhydride modified polypropylene is Orevac18722, and the double long-chain alkyl ammonium modified montmorillonite is purchased from Zhejiang Feng hong New material Co., ltd, and the model is DK7; the antioxidant is one or more selected from antioxidant 300, antioxidant 1010, antioxidant 1035 and antioxidant 1024.
2. A method for preparing the polypropylene modified insulating material according to claim 1, comprising the steps of:
(1) Blending polypropylene A, polypropylene B, ethylene-octene high polymer, ethylene-vinyl acetate copolymer, maleic anhydride modified polypropylene, antioxidant and double long chain alkyl ammonium modified montmorillonite, mixing by using a double screw, detecting the melting temperature in the process, monitoring the reaction progress in real time, and extruding by using a single screw;
the processing temperature is 160-180-200-210-220-230-210-190-180-170 ℃, the time of the mixing process is 4min, and the rotating speed is 200rpm;
(2) Conveying the single-screw extruded material to a granulator, dehydrating by a dehydrator, entering a cyclone separator, boiling, drying, and discharging to obtain the material;
the moisture content after dehydration was <0.03%.
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| CN101649088A (en) * | 2009-09-17 | 2010-02-17 | 公安部四川消防研究所 | Halogen-free intumescent flame-retardant polypropylene/ethylene vinyl acetate cable material |
| CN104629175A (en) * | 2015-01-20 | 2015-05-20 | 江苏上上电缆集团有限公司 | Low-smoke halogen-free flame-retardant polypropylene cable material and preparation method thereof |
| JP2017031337A (en) * | 2015-08-03 | 2017-02-09 | 日立金属株式会社 | Non-halogen flame-retardant resin composition, and insulated electric wire and cable |
| CN114292466A (en) * | 2021-12-07 | 2022-04-08 | 中广核高新核材科技（苏州）有限公司 | Modified polypropylene insulating material for medium and low voltage power cable and preparation method thereof |
| CN114539669A (en) * | 2022-03-08 | 2022-05-27 | 哈尔滨理工大学 | Nano modified blended polypropylene, preparation method and high-voltage cable |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101649088A (en) * | 2009-09-17 | 2010-02-17 | 公安部四川消防研究所 | Halogen-free intumescent flame-retardant polypropylene/ethylene vinyl acetate cable material |
| CN104629175A (en) * | 2015-01-20 | 2015-05-20 | 江苏上上电缆集团有限公司 | Low-smoke halogen-free flame-retardant polypropylene cable material and preparation method thereof |
| JP2017031337A (en) * | 2015-08-03 | 2017-02-09 | 日立金属株式会社 | Non-halogen flame-retardant resin composition, and insulated electric wire and cable |
| CN114292466A (en) * | 2021-12-07 | 2022-04-08 | 中广核高新核材科技（苏州）有限公司 | Modified polypropylene insulating material for medium and low voltage power cable and preparation method thereof |
| CN114539669A (en) * | 2022-03-08 | 2022-05-27 | 哈尔滨理工大学 | Nano modified blended polypropylene, preparation method and high-voltage cable |
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Denomination of invention: A modified polypropylene insulation material and its preparation method Effective date of registration: 20231225 Granted publication date: 20230919 Pledgee: Nanjing bank Limited by Share Ltd. Gaochun branch Pledgor: NANJING ZHONGCHAO NEW MATERIALS Corp. Registration number: Y2023980073896 |