CN114605742A - Preparation method of polypropylene-based insulating material modified by multiple functional groups for polypropylene cable insulation - Google Patents
Preparation method of polypropylene-based insulating material modified by multiple functional groups for polypropylene cable insulation Download PDFInfo
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- -1 polypropylene Polymers 0.000 title claims abstract description 76
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- 238000009413 insulation Methods 0.000 title claims abstract description 29
- 239000011810 insulating material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 33
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 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 group 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 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 10
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 9
- WETWJCDKMRHUPV-UHFFFAOYSA-N acetyl chloride Chemical compound CC(Cl)=O WETWJCDKMRHUPV-UHFFFAOYSA-N 0.000 claims description 9
- 239000012346 acetyl chloride Substances 0.000 claims description 9
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 9
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- 230000015556 catabolic process Effects 0.000 abstract description 13
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- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical group CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 abstract description 7
- 238000006640 acetylation reaction Methods 0.000 abstract description 4
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- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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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
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/10—Acylation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
Abstract
A preparation method of polypropylene-based insulating material modified by multiple functional groups for polypropylene cable insulation relates to a preparation method of polypropylene-based insulating material. The SEBS dielectric material aims to solve the problems of low breakdown strength and poor direct-current dielectric property of the SEBS. The preparation method of the polypropylene-based insulating material modified by the multifunctional group for polypropylene cable insulation comprises the following steps: preparing SEBS-g-MAH, preparing AC-SEBS-g-MAH, and melt blending the homopolymerized polypropylene, the AC-SEBS-g-MAH and the antioxidant to obtain the polypropylene-based insulating material. According to the invention, maleic anhydride grafting and acetylation are used for modifying functional groups in a styrene-butadiene block copolymer in sequence, the prepared material is used as a flexibility-increasing modified filler, and space charge accumulation is improved by using a deep trap introduced by an anhydride functional group in MAH; and the direct current dielectric property of the polypropylene insulating material is improved by utilizing the acetophenone functional group formed by acetylation reaction in a synergistic optimization way.
Description
Technical Field
The invention relates to a preparation method of a polypropylene-based insulating material.
Background
In recent years, with the increasing energy shortage and environmental protection pressure, and the proposition and promotion of "carbon peak reaching" and "carbon neutralization", thermoplastic cables are again gaining attention due to their natural energy-saving and environmental protection characteristics. The polypropylene material has high hardness, the bending modulus of the material must be reduced to meet the requirements of cable use and manufacturing process, and the polypropylene/elastomer blending modification technology represented by the Primulman is prepared by blending polypropylene with high crystalline melting temperature and elastomer with low modulus, has extremely high flexibility, process compliance and excellent electrical property, and represents the mainstream modification technology in the world. At present, medium-high voltage polypropylene insulated cables run for tens of thousands of kilometers in Europe, wherein the highest voltage level of alternating current cables reaches 150kV, and the highest voltage level of direct current cables reaches 525 kV; the development of polypropylene insulated cables in China is still in the initial stage, the development of domestic 35kV polypropylene insulated alternating current cables is basically completed by following the Prui-Seman blending modification technical route, but the development of polypropylene insulated direct current cables has not made breakthrough progress yet, and the difficulty lies in the difficulty in the development of direct current materials.
At present, polypropylene and thermoplastic elastomer are blended and modified, so that the modulus of the material is reduced, the rigidity is reduced, and the flexibility is increased on the premise of not losing heat resistance, so that the polypropylene cable is suitable for cable insulation manufacture and use.
The styrene-butadiene block copolymer (SEBS) is a linear triblock copolymer, has stable structure due to the physical crosslinking point of a styrene block, provides softness due to a middle butadiene block, has high melting temperature (more than 120 ℃) and low elastic modulus, and can meet the use requirement of a polypropylene cable at 110 ℃. However, the SEBS has certain problems in the production of polypropylene insulated cables, and the added thermoplastic elastomer has poor insulating property, so that the breakdown strength of the material is obviously reduced. In addition, unstable tertiary hydrogen of polypropylene falls off under a high-temperature high field, the polypropylene is further aged due to the introduction of oxygen, free radicals are further subjected to chemical reaction due to unpaired electrons, the degradation of the polymer is accelerated, and more impurities are introduced, so that the direct-current dielectric property of a polymer system is deteriorated.
Disclosure of Invention
The invention provides a preparation method of a multifunctional group modified polypropylene-based insulating material for polypropylene cable insulation, aiming at solving the problems of low breakdown strength and poor direct-current dielectric property of the existing SEBS.
The preparation method of the polypropylene-based insulating material modified by the multifunctional group for polypropylene cable insulation comprises the following steps:
firstly, preparing SEBS-g-MAH
Uniformly mixing SEBS (styrene-butadiene block copolymer) and maleic anhydride, adding DCP (dioctyl phthalate) as an initiator, carrying out melt reaction and grafting for 5 minutes by using a torque rheometer, adding an antioxidant after torque is stable, and then mixing for 10 minutes to obtain SEBS-g-MAH;
the addition amount of the maleic anhydride is 0.3-2% of the mass of the SEBS;
the addition amount of the DCP is 0.012-0.085% of the mass of the SEBS;
the temperature of the torque rheometer during the melt reaction grafting is 190 ℃, and the rotating speed is 40 rpm;
the antioxidant is 1010, and the addition amount of the antioxidant is 0.3 percent of the mass of SEBS;
secondly, preparing AC-SEBS-g-MAH
Putting SEBS-g-MAH into a round-bottomed bottle containing dichloromethane, stirring and heating to completely dissolve solids, and cooling to room temperature;
② adding acetyl chloride into the solution to dissolve, then adding anhydrous aluminium trichloride (AlCl)3) Reacting for 3 hours, addingAdding analytically pure methanol for extraction, then filtering to obtain a solid product, and drying the solid product;
when extraction is carried out, the AC-SEBS-g-MAH and analytically pure methanol (the mass fraction of methanol is 99.95%) form a solution and are obviously layered, filter paper and a funnel are used for filtering to obtain white flocculent solid, the residual analytically pure methanol in the white flocculent solid is further dried, the methanol is heated and volatilized, and finally purification is carried out to obtain the AC-SEBS-g-MAH;
thirdly, repeating the step II for three times to obtain AC-SEBS-g-MAH;
step two, the adding amount of the dichloromethane is 260 percent of the mass of the SEBS-g-MAH
Secondly, adding acetyl chloride in an amount which is 5.5 percent of the mass of the SEBS-g-MAH;
secondly, adding anhydrous aluminum trichloride in an amount which is 4-7% of the mass of the SEBS-g-MAH;
step two, the addition amount of the analytically pure methanol is 240 percent of the mass of the SEBS-g-MAH;
step two, the drying process comprises the following steps: drying at 50 deg.C for 5 h;
secondly, the heating temperature is 75 ℃;
preparation of polypropylene insulating material
Placing 50-80 parts of homopolymerized polypropylene, 20-50 parts of AC-SEBS-g-MAH and 0.3-2 parts of antioxidant in an internal mixer, and carrying out melt blending for 5-15 minutes at 190 ℃, wherein the rotating speed of the internal mixer is 60-70 revolutions per minute, so as to obtain a polypropylene-based insulating material;
step three, the antioxidant is an antioxidant 1010;
the principle and the beneficial effects of the invention are as follows:
the invention uses acetylated maleic anhydride grafted styrene-butadiene block copolymer (AC-SEBS-g-MAH) as a flexibility-increasing modified filler, introduces polar double groups, introduces deep traps by using the MAH, inhibits the injection and migration of charges, and improves the accumulation of space charges; the voltage stabilizer effect of the acetophenone functional group formed by acetylation reaction is utilized to improve the breakdown strength, and the direct-current dielectric property of the polypropylene insulating material is synergistically optimized and improved.
Drawings
FIG. 1 is an absorption chart of the infrared spectrum of the acetophenone functional group of AC-SEBS-g-MAH in example 1;
FIG. 2 is an absorption diagram of the IR spectrum of the MAH functional groups of AC-SEBS-g-MAH in example 1;
FIG. 3 is a Weibull distribution plot of breakdown field strength at room temperature for the material of example 1;
FIG. 4 is a diagram showing the internal space charge density distribution (room temperature short circuit) of SEBS/PP in example 1;
FIG. 5 is a graph showing the internal space charge density distribution (room temperature short circuit) of AC-SEBS-g-MAH/PP (B) in example 1;
FIG. 6 is a SEBS/PP internal space charge density distribution graph (50 degree short) in example 1;
FIG. 7 is a graph showing the distribution of the internal space charge density (50 degree short) of AC-SEBS-g-MAH/PP (B) in example 1.
Detailed Description
The technical scheme of the invention is not limited to the specific embodiments listed below, and any reasonable combination of the specific embodiments is included.
The first specific implementation way is as follows: the preparation method of the multifunctional group modified polypropylene-based insulating material for polypropylene cable insulation of the embodiment comprises the following steps:
firstly, preparing SEBS-g-MAH
Uniformly mixing a styrene-butadiene block copolymer with maleic anhydride, adding dioctyl phthalate serving as an initiator, carrying out melt reaction grafting for 5 minutes by using a torque rheometer, adding an antioxidant after torque is stable, and then mixing for 10 minutes to obtain SEBS-g-MAH;
the addition amount of the maleic anhydride is 0.3-2% of the mass of the SEBS;
the addition amount of the DCP is 0.012-0.085% of the mass of the SEBS;
secondly, preparing AC-SEBS-g-MAH
Putting SEBS-g-MAH into a round-bottomed bottle containing dichloromethane, stirring and heating to completely dissolve solids, and cooling to room temperature;
secondly, pouring acetyl chloride into the solution to dissolve the acetyl chloride, adding anhydrous aluminum trichloride, reacting for 3 hours, adding analytically pure methanol to extract after the reaction is finished, filtering to obtain a solid product, and drying the solid product;
thirdly, repeating the step II for three times to obtain AC-SEBS-g-MAH;
step two, the adding amount of the dichloromethane is 260 percent of the mass of the SEBS-g-MAH
Secondly, adding acetyl chloride in an amount which is 5.5 percent of the mass of the SEBS-g-MAH;
secondly, adding anhydrous aluminum trichloride in an amount which is 4-7% of the mass of the SEBS-g-MAH;
step two, the addition amount of the analytically pure methanol is 240 percent of the mass of the SEBS-g-MAH;
preparation of polypropylene insulating material
50-80 parts of homopolymerized polypropylene, 20-50 parts of AC-SEBS-g-MAH and 0.3-2 parts of antioxidant are placed in an internal mixer, and are melted and blended for 5-15 minutes at 190 ℃, and the rotating speed of the internal mixer is 60-70 r/min, so that the polypropylene-based insulating material is obtained.
The embodiment adopts an acetylated maleic anhydride grafted styrene-butadiene block copolymer (AC-SEBS-g-MAH) as a flexibility-increasing modified filler, introduces polar double groups, introduces a deep trap by using the MAH, inhibits the injection and migration of charges, and improves the accumulation of space charges; the voltage stabilizer effect of the acetophenone functional group formed by acetylation reaction is utilized to improve the breakdown strength, and the direct-current dielectric property of the polypropylene insulating material is synergistically optimized and improved.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: step one, the temperature of the torque rheometer during the melt reaction grafting is 190 ℃, and the rotating speed is 40 rpm.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: step one, the antioxidant is antioxidant 1010, and the adding amount is 0.3 percent of the mass of SEBS.
The fourth concrete implementation mode is as follows: the difference between this embodiment mode and one of the first to third embodiment modes is: step one, the addition amount of the maleic anhydride is 0.4 percent of the mass of the SEBS.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the first step, the addition amount of the DCP is 0.02 percent of the mass of the SEBS.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: and secondly, adding the anhydrous aluminum trichloride in an amount which is 5% of the mass of the SEBS-g-MAH.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: step two, the drying process comprises the following steps: drying at 50 deg.C for 5 h.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: and the heating temperature in the second step is 75 ℃.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: and step three, the antioxidant is an antioxidant 1010.
The detailed implementation mode is ten: the present embodiment differs from one of the first to ninth embodiments in that: and step three, putting 70g of homopolymerized polypropylene, 30g of AC-SEBS-g-MAH and 0.5g of antioxidant 1010 into an internal mixer, wherein the rotating speed of the internal mixer is 70 r/min, and mixing for 10min at 190 ℃ to obtain the polypropylene insulating material.
Example 1:
the preparation method of the polyfunctionally-modified polypropylene-based insulating material for polypropylene cable insulation of the embodiment comprises the following steps:
firstly, uniformly mixing 12g of SEBS (styrene-butadiene block copolymer) and 0.7g of maleic anhydride, adding 0.03g of DCP (dioctyl phthalate) as an initiator, carrying out melt reaction and grafting for 5 minutes by using a torque rheometer, wherein the temperature of the torque rheometer is 190 ℃, the rotating speed is 40rpm, adding 0.3g of antioxidant 1010 after torque is stabilized, and then mixing for 10 minutes to obtain SEBS-g-MAH;
secondly, preparing AC-SEBS-g-MAH
Weighing 10g of SEBS-g-MAH obtained in the step one, putting the SEBS-g-MAH into a round-bottom flask containing 200 ml of dichloromethane, stirring and heating the mixture to 75 ℃ by using a magnetic stirring electric heating jacket, and flushing the round-bottom flask with cold water until the temperature of the round-bottom flask is recovered to room temperature after the solid is completely dissolved;
pouring 5 ml of acetyl chloride into the solution for dissolving, adding 0.5g of anhydrous aluminum trichloride, fully reacting for 3 hours, pouring 300 ml of analytically pure methanol into the solution for extraction after the reaction is finished, separating out a white flocculent solid form, filtering a solid product, and drying;
thirdly, repeating the step II for three times to obtain AC-SEBS-g-MAH;
step two, the drying process comprises the following steps: drying at 50 deg.C for 5 h;
the molecular structure of the AC-SEBS-g-MAH obtained in the second step contains MAH and acetophenone functional groups, and double effects of a deep trap and a voltage stabilizer can be generated.
Thirdly, 70g of homopolymerized polypropylene, 30g of AC-SEBS-g-MAH and 0.5g of antioxidant 1010 are placed into an internal mixer, the rotating speed of the internal mixer is 70 r/min, and the mixture is mixed for 10min at 190 ℃ to obtain a polypropylene insulating material, which is marked as AC-SEBS-g-MA H/PP (B); simultaneously changing the addition amount of the anhydrous aluminum trichloride in the second step to be 0.4g, 0.6g and 0.7g respectively, and recording the obtained products as: C-SEBS-g-MAH/PP (A), AC-SEBS-g-MAH/PP (C), AC-SEBS-g-MAH/PP (D);
FIG. 1 is an absorption diagram of the infrared spectrum of the acetophenone functional group of AC-SEBS-g-MAH; FIG. 2 is an absorption diagram of the infrared spectrum of the MAH functional groups of AC-SEBS-g-MAH; a, B, C, D in FIG. 1 and FIG. 2 correspond to AC-SEBS-g-MAH/PP (A), AC-SEBS-g-MAH/PP (B), AC-SEBS-g-MAH/PP (C), AC-SEBS-g-MAH/PP (D), respectively,
FIG. 1 shows a wave number of 1269cm-1Where there is a peak of aromatic ketone skeleton, and the wave number is 1684cm in FIG. 2-1An MAH carbon-oxygen double bond stretching vibration absorption peak exists, and can be judged through the absorption peak, and the MAH and acetophenone functional groups are successfully introduced into an insulation system in the embodiment 1.
FIG. 3 is a Weibull distribution plot of breakdown field strength at room temperature; the Weibull distribution plots of the breakdown field strengths of AC-SEBS-g-MAH/PP (A), AC-SEBS-g-MAH/PP (B), AC-SEBS-g-MAH/PP (C) and AC-SEBS-g-MAH/PP (D) at normal temperature are shown in FIG. 3. As can be seen from the figure, the breakdown strength of SEBS/PP is obviously reduced compared with that of pure PP after SEBS is added, the breakdown strength is obviously improved after SEBS is grafted with MAH, and the breakdown strength of the material is further improved after the SEBS is modified by bifunctional groups, wherein the direct-current breakdown strength of the AC-SEBS-g-MAH/PP (B) polypropylene-based insulating material is even higher than that of the pure PP.
Testing the distribution situation of the internal space charge density of the material by using an electroacoustic pulse method, as shown in FIGS. 4-7, FIG. 4 is a SEBS/PP internal space charge density distribution diagram (normal temperature short circuit); FIG. 5 is a diagram showing the distribution of the internal space charge density (room temperature short circuit) of AC-SEBS-g-MAH/PP (B); FIG. 6 is a SEBS/PP internal space charge density distribution plot (50 degree short); FIG. 7 is a graph of the AC-SEBS-g-MAH/PP (B) internal space charge density distribution (50 degree short); after the bifunctional group is modified, the space charge amount in the material is obviously reduced, an electric field in the material is homogenized, the distortion degree of the electric field is reduced, and the direct-current dielectric property of the material is improved, so that the partial discharge phenomenon of the polypropylene cable is inhibited, and the service life of the polypropylene cable is prolonged.
The preparation process of the SEBS/PP comprises the following steps: and (2) uniformly mixing 12g of SEBS (styrene-butadiene block copolymer) and 28g of homopolymerized polypropylene through a torque rheometer, wherein the temperature of the torque rheometer is 190 ℃, the rotating speed is 40rpm, adding 0.3g of antioxidant 1010 after the torque is stable, and then mixing for 10 minutes to obtain the SEBS/PP. The preparation process of the SEBS-g-MAH/PP comprises the following steps: and (3) weighing 12g of SEBS-g-MAH obtained in the step one, uniformly mixing with 28g of homopolymerized polypropylene through a torque rheometer, wherein the temperature of the torque rheometer is 190 ℃, the rotating speed is 40rpm, adding 0.3g of antioxidant 1010 after the torque is stable, and then mixing for 10 minutes to obtain the SEBS-g-MAH/PP.
Claims (10)
1. A preparation method of polypropylene-based insulating material modified by multiple functional groups for polypropylene cable insulation is characterized by comprising the following steps: the method comprises the following steps:
firstly, preparing SEBS-g-MAH
Uniformly mixing a styrene-butadiene block copolymer with maleic anhydride, adding dioctyl phthalate serving as an initiator, carrying out melt reaction grafting for 5 minutes by using a torque rheometer, adding an antioxidant after torque is stable, and then mixing for 10 minutes to obtain SEBS-g-MAH;
the addition amount of the maleic anhydride is 0.3-2% of the mass of the SEBS;
the addition amount of the DCP is 0.012-0.085% of the mass of the SEBS;
secondly, preparing AC-SEBS-g-MAH
Putting SEBS-g-MAH into a round-bottomed bottle containing dichloromethane, stirring and heating to completely dissolve solids, and cooling to room temperature;
secondly, pouring acetyl chloride into the solution to dissolve the acetyl chloride, adding anhydrous aluminum trichloride, reacting for 3 hours, adding analytically pure methanol to extract after the reaction is finished, filtering to obtain a solid product, and drying the solid product;
thirdly, repeating the step II for three times to obtain AC-SEBS-g-MAH;
step two, the adding amount of the dichloromethane is 260 percent of the mass of the SEBS-g-MAH
Secondly, adding acetyl chloride in an amount which is 5.5 percent of the mass of the SEBS-g-MAH;
secondly, adding anhydrous aluminum trichloride in an amount which is 4-7% of the mass of the SEBS-g-MAH;
step two, the addition amount of the analytically pure methanol is 240 percent of the mass of the SEBS-g-MAH;
preparation of polypropylene insulating material
50-80 parts of homopolymerized polypropylene, 20-50 parts of AC-SEBS-g-MAH and 0.3-2 parts of antioxidant are placed in an internal mixer, and are melted and blended for 5-15 minutes at 190 ℃, and the rotating speed of the internal mixer is 60-70 r/min, so that the polypropylene-based insulating material is obtained.
2. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: step one, the temperature of the torque rheometer during the melt reaction grafting is 190 ℃, and the rotating speed is 40 rpm.
3. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: step one, the antioxidant is antioxidant 1010, and the adding amount is 0.3 percent of the mass of SEBS.
4. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: step one, the addition amount of the maleic anhydride is 0.4 percent of the mass of the SEBS.
5. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: in the first step, the addition amount of the DCP is 0.02 percent of the mass of the SEBS.
6. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: and secondly, adding the anhydrous aluminum trichloride in an amount which is 5% of the mass of the SEBS-g-MAH.
7. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: step two, the drying process comprises the following steps: drying at 50 deg.C for 5 h.
8. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: and the heating temperature in the second step is 75 ℃.
9. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: and step three, the antioxidant is an antioxidant 1010.
10. The method of preparing the polyfunctionally-modified polypropylene-based insulation for polypropylene cable insulation according to claim 1, wherein: and step three, putting 70g of homopolymerized polypropylene, 30g of AC-SEBS-g-MAH and 0.5g of antioxidant 1010 into an internal mixer, wherein the rotating speed of the internal mixer is 70 r/min, and mixing for 10min at 190 ℃ to obtain the polypropylene insulating material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115403874A (en) * | 2022-08-19 | 2022-11-29 | 国网黑龙江省电力有限公司电力科学研究院 | Nonlinear ethylene propylene rubber composite material with high electric strength resistance and high electric conductivity and preparation method thereof |
| CN117736516B (en) * | 2024-02-07 | 2024-05-03 | 哈尔滨理工大学 | Polypropylene-based insulating material resistant to water tree branch aging and preparation method thereof |
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2022
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| 刘安琪: "SEBS/PP无卤阻燃电缆料的研究", 《中国优秀硕士学位论文全文数据库（电子期刊）》, pages 016 - 134 * |
| 周喻: "cPP-g-MAH/iPP/SEBS复合材料直流介电性能研究", 《中国优秀硕士学位论文全文数据库（电子期刊）》, pages 042 - 115 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115403874A (en) * | 2022-08-19 | 2022-11-29 | 国网黑龙江省电力有限公司电力科学研究院 | Nonlinear ethylene propylene rubber composite material with high electric strength resistance and high electric conductivity and preparation method thereof |
| CN115403874B (en) * | 2022-08-19 | 2023-11-21 | 国网黑龙江省电力有限公司电力科学研究院 | Non-linear ethylene propylene rubber composite material with high electric strength and electric conductivity and preparation method thereof |
| CN117736516B (en) * | 2024-02-07 | 2024-05-03 | 哈尔滨理工大学 | Polypropylene-based insulating material resistant to water tree branch aging and preparation method thereof |
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