CN117624820A - Polypropylene material based on dynamic/ionic crosslinking and preparation method thereof - Google Patents
Polypropylene material based on dynamic/ionic crosslinking and preparation method thereof Download PDFInfo
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- CN117624820A CN117624820A CN202311547546.4A CN202311547546A CN117624820A CN 117624820 A CN117624820 A CN 117624820A CN 202311547546 A CN202311547546 A CN 202311547546A CN 117624820 A CN117624820 A CN 117624820A
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- -1 Polypropylene Polymers 0.000 title claims abstract description 125
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 104
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 104
- 239000000463 material Substances 0.000 title claims abstract description 75
- 238000004132 cross linking Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003063 flame retardant Substances 0.000 claims abstract description 60
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims abstract description 31
- 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 abstract description 26
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 22
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 22
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000008117 stearic acid Substances 0.000 claims abstract description 22
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims abstract description 18
- 150000001875 compounds Chemical class 0.000 claims abstract description 15
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 14
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 14
- 229920006295 polythiol Polymers 0.000 claims abstract description 14
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000155 melt Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 42
- 238000001125 extrusion Methods 0.000 claims description 28
- 239000008187 granular material Substances 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims description 16
- 239000004114 Ammonium polyphosphate Substances 0.000 claims description 16
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 16
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims description 16
- 229920001276 ammonium polyphosphate Polymers 0.000 claims description 16
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 claims description 16
- OEBXWWBYZJNKRK-UHFFFAOYSA-N 1-methyl-2,3,4,6,7,8-hexahydropyrimido[1,2-a]pyrimidine Chemical compound C1CCN=C2N(C)CCCN21 OEBXWWBYZJNKRK-UHFFFAOYSA-N 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 12
- 230000003179 granulation Effects 0.000 claims description 12
- 239000011787 zinc oxide Substances 0.000 claims description 8
- IMQFZQVZKBIPCQ-UHFFFAOYSA-N 2,2-bis(3-sulfanylpropanoyloxymethyl)butyl 3-sulfanylpropanoate Chemical compound SCCC(=O)OCC(CC)(COC(=O)CCS)COC(=O)CCS IMQFZQVZKBIPCQ-UHFFFAOYSA-N 0.000 claims description 7
- FVKFHMNJTHKMRX-UHFFFAOYSA-N 3,4,6,7,8,9-hexahydro-2H-pyrimido[1,2-a]pyrimidine Chemical compound C1CCN2CCCNC2=N1 FVKFHMNJTHKMRX-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 5
- BPXVHIRIPLPOPT-UHFFFAOYSA-N 1,3,5-tris(2-hydroxyethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound OCCN1C(=O)N(CCO)C(=O)N(CCO)C1=O BPXVHIRIPLPOPT-UHFFFAOYSA-N 0.000 claims description 4
- 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 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 150000002148 esters Chemical class 0.000 claims description 4
- 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 claims description 4
- 235000002949 phytic acid Nutrition 0.000 claims description 4
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims description 3
- 229940068041 phytic acid Drugs 0.000 claims description 3
- 239000000467 phytic acid Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- JOBBTVPTPXRUBP-UHFFFAOYSA-N [3-(3-sulfanylpropanoyloxy)-2,2-bis(3-sulfanylpropanoyloxymethyl)propyl] 3-sulfanylpropanoate Chemical compound SCCC(=O)OCC(COC(=O)CCS)(COC(=O)CCS)COC(=O)CCS JOBBTVPTPXRUBP-UHFFFAOYSA-N 0.000 claims description 2
- 238000010382 chemical cross-linking Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000010000 carbonizing Methods 0.000 description 3
- 229910000077 silane Inorganic materials 0.000 description 3
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 125000002843 carboxylic acid group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- PMNLUUOXGOOLSP-UHFFFAOYSA-M 2-sulfanylpropanoate Chemical compound CC(S)C([O-])=O PMNLUUOXGOOLSP-UHFFFAOYSA-M 0.000 description 1
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 1
- 206010000369 Accident Diseases 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- RUDUCNPHDIMQCY-UHFFFAOYSA-N [3-(2-sulfanylacetyl)oxy-2,2-bis[(2-sulfanylacetyl)oxymethyl]propyl] 2-sulfanylacetate Chemical compound SCC(=O)OCC(COC(=O)CS)(COC(=O)CS)COC(=O)CS RUDUCNPHDIMQCY-UHFFFAOYSA-N 0.000 description 1
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical class [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 150000008064 anhydrides Chemical group 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 150000007942 carboxylates Chemical group 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000012796 inorganic flame retardant Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application is applicable to the technical field of materials, and provides a polypropylene material based on dynamic/ionic crosslinking and a preparation method thereof, wherein the method comprises the following steps: 100 parts of polypropylene, 2 parts of maleic anhydride, 1-2 parts of dicumyl peroxide, 5-15 parts of metal oxide, 1 part of stearic acid, 1-8 parts of polythiol compound, 0.1-0.8 part of catalyst, 15-25 parts of halogen-free flame retardant and 0.1-1 part of heat stabilizer. The raw materials are easy to obtain, and the sources are stable; by introducing the ionic crosslinking and dynamic crosslinking dual structure into the polypropylene, the melt viscosity and the melt strength of the polypropylene can be improved, the flame retardant property and the anti-dripping property of the polypropylene material can be improved, and the molding processing of the material is not influenced. Compared with an ionic physical crosslinking structure, the dynamic chemical crosslinking structure is further introduced to improve the anti-dripping property and flame retardance of the material. The maleic anhydride grafted polypropylene can also improve the dispersibility of the flame retardant and improve the compatibility between the polypropylene and the flame retardant.
Description
Technical Field
The application belongs to the technical field of materials, and particularly relates to a polypropylene material based on dynamic/ionic crosslinking and a preparation method thereof.
Background
The polypropylene has the advantages of chemical corrosion resistance, high strength, electrical insulation, low cost, high processability and the like, and is widely applied to the fields of chemical industry, construction, household appliances, packaging and the like. In five general-purpose plastics, polypropylene is consumed in a second amount to polyethylene. However, since polypropylene itself is extremely flammable, limiting oxygen index is only 17.0%, and the amount of heat generated is large, the burning speed is high, and dripping is accompanied during burning, thereby limiting the application of polypropylene materials in industries with higher flame-retardant level requirements. And the molten drops during combustion not only can scald people, but also can cause secondary combustion, promote the spread of fire, improve the occurrence level of fire accidents and increase the disaster relief difficulty. Therefore, the improvement of the anti-dripping property and the flame retardant property of the polypropylene plays an important role in the development and application of flame retardant polypropylene materials.
As the polypropylene material is easy to release toxic gas during combustion, the use of halogen-containing flame retardants is gradually reduced along with the enhancement of environmental awareness of people, and clean, halogen-free and efficient flame retardants become development directions. Therefore, the use of halogen-free flame retardants is a prerequisite for flame retarding polypropylene materials. The conventional halogen-free flame retardant mainly comprises magnesium-aluminum series, phosphorus series and intumescent flame retardant. At present, in the research of flame retardant modification of polyolefin, there is a method for preparing halogen-free flame retardant polyethylene foaming composite material by adopting silane self-crosslinking and adding inorganic flame retardant master batch; or silane self-crosslinking is adopted, and a low-smoke halogen-free flame-retardant olefin block copolymer material is prepared by adding aluminum hydroxide, magnesium hydroxide and zinc borate compound flame retardant. However, the silane crosslinking method involves hydrolysis reaction, making the stability of the product poor. In addition, in the research of flame retardant modification of other polyesters, the method for improving the anti-dripping property of the material is mainly to add anti-dripping agents, such as polytetrafluoroethylene and derivatives thereof, silicon dioxide, glass fibers and the like. Although the addition of these anti-dripping agents can improve the anti-dripping effect of the material, the mechanical properties of the material can be destroyed, and the application range is greatly limited. Therefore, it is necessary to provide a novel halogen-free flame-retardant anti-dripping polypropylene material and a preparation method thereof.
Therefore, the existing polypropylene modified material has the problems of poor anti-dripping performance and insufficient mechanical property, and limits the application range.
Disclosure of Invention
The embodiment of the application aims to provide a polypropylene material based on dynamic/ionic crosslinking, and aims to solve the problems that the existing polypropylene modified material has poor anti-dripping performance and insufficient mechanical property and limits the application range of the polypropylene modified material.
The embodiment of the application is realized in such a way that the polypropylene material based on dynamic/ionic crosslinking comprises the following raw materials in parts by weight:
100 parts of polypropylene, 2 parts of maleic anhydride, 1-2 parts of dicumyl peroxide, 5-15 parts of metal oxide, 1 part of stearic acid, 1-8 parts of polythiol compound, 0.1-0.8 part of catalyst, 15-25 parts of halogen-free flame retardant and 0.1-1 part of heat stabilizer.
Another object of an embodiment of the present application is to provide a method for preparing the dynamic/ionic crosslinking-based polypropylene material, which is characterized by comprising:
mixing polypropylene, maleic anhydride and dicumyl peroxide, and then carrying out melt extrusion and granulation to obtain maleic anhydride grafted polypropylene granules;
mixing the maleic anhydride grafted polypropylene granules, metal oxide, stearic acid, polythiol compound, catalyst, halogen-free flame retardant and heat stabilizer, and performing melt extrusion and granulation to obtain the modified polypropylene.
Another object of an embodiment of the present application is to provide a method for preparing the dynamic/ionic crosslinking-based polypropylene material, which is characterized by comprising:
mixing polypropylene, maleic anhydride, dicumyl peroxide, metal oxide, stearic acid, a polythiol compound and a catalyst, and performing melt extrusion and granulation to obtain crosslinked polypropylene granules;
mixing the crosslinked polypropylene granules, the halogen-free flame retardant and the heat stabilizer, and performing melt extrusion and granulation to obtain the flame retardant.
The polypropylene material based on dynamic/ionic crosslinking provided by the embodiment of the application has the advantages of easily available raw materials and stable sources; by introducing the ionic crosslinking and dynamic crosslinking dual structure into the polypropylene, the melt viscosity and the melt strength of the polypropylene can be improved, the flame retardant property and the anti-dripping property of the polypropylene material can be improved, and the molding processing of the material is not influenced. Compared with an ionic physical crosslinking structure, the dynamic chemical crosslinking structure is further introduced to improve the anti-dripping property and flame retardance of the material. In addition, the maleic anhydride grafted polypropylene can also improve the dispersibility of the flame retardant and improve the compatibility between the polypropylene and the flame retardant.
According to the preparation method of the polypropylene material based on dynamic/ionic crosslinking, in the melt extrusion process, maleic anhydride reacts with polypropylene under the condition of peroxide initiation to obtain a grafted product maleic anhydride grafted polypropylene, meanwhile, under the action of stearic acid, part of anhydride groups are hydrolyzed under the acidic condition to generate carboxylic acid groups, metal oxides neutralize the carboxylic acid groups in the maleic anhydride grafted polypropylene, so that ionic bonding is formed between metal ions and carboxylate groups, an ionic crosslinking structure is formed between polypropylene molecular chains, the rest of maleic anhydride groups react with mercapto groups of a polythiol compound, and under the action of a catalyst, mercapto-thioester bond exchange can be performed to form a dynamic chemical crosslinking structure. In addition, the preparation is carried out by reactive extrusion, and the preparation process is simple, the technical cost is low, the pollution is less, and the method is favorable for large-scale industrial production.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The embodiment of the application provides a polypropylene material based on dynamic/ionic crosslinking, which comprises the following raw materials in parts by weight:
100 parts of polypropylene, 2 parts of maleic anhydride, 1-2 parts of dicumyl peroxide, 5-15 parts of metal oxide, 1 part of stearic acid, 1-8 parts of polythiol compound, 0.1-0.8 part of catalyst, 15-25 parts of halogen-free flame retardant and 0.1-1 part of heat stabilizer.
In a preferred embodiment of the present application, the dynamic/ionic crosslinking based polypropylene material comprises the following raw materials in parts by weight:
100 parts of polypropylene, 2 parts of maleic anhydride, 1.5 parts of dicumyl peroxide, 10 parts of metal oxide, 1 part of stearic acid, 4 parts of polythiol compound, 0.4 part of catalyst, 20 parts of halogen-free flame retardant and 0.5 part of heat stabilizer.
Wherein the polythiol compound is one of pentaerythritol tetra (3-mercaptopropionic acid) ester, pentaerythritol tetra (3-mercaptoacetic acid) ester, phytic acid (mercaptopropionic acid) ester and trimethylolpropane tri (3-mercaptopropionic acid) ester.
Wherein the catalyst is one of 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene.
Wherein the heat stabilizer is one of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tri (2, 4-di-tert-butylphenyl) phosphite and 1,3, 5-tri (2-hydroxyethyl) cyanuric acid.
Wherein the metal oxide is one of zinc oxide, magnesium oxide and calcium oxide.
Wherein the halogen-free flame retardant is a mixture composed of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer. Preferably, the mass ratio of the ammonium polyphosphate, the melamine cyanurate and the macromolecular triazine carbonating agent is 3:1:1. the excessive content of the flame retardant can cause the mechanical property of the obtained product to be reduced and influence the molding processing of the material, so the content of the halogen-free flame retardant is preferably 15-25 parts by weight.
The raw materials used above are described below: polypropylene is purchased from the national energy group Ningxia coal industry Limited liability company; maleic anhydride, dicumyl peroxide, stearic acid, zinc oxide, magnesium oxide, and calcium oxide were purchased from Shanghai Ara Ding Shenghua technologies Co., ltd; ammonium polyphosphate and macromolecular triazine carbonizers were purchased from new materials, inc; melamine cyanurate from atactic gold Yingtai chemical company; tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate n-stearyl alcohol ester, tris (2, 4-di-tert-butylphenyl) phosphite and 1,3, 5-tris (2-hydroxyethyl) cyanuric acid were purchased from Shanghai microphone Biochemical technologies Co., ltd; pentaerythritol tetrakis (3-mercaptopropionate), trimethylolpropane tris (3-mercaptopropionate), 1,5, 7-triazabicyclo [4.4.0] dec-5-ene and 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene were purchased from sigma aldrich (Shanghai) trade company; pentaerythritol tetrakis (3-mercaptoacetate) and phytate (mercaptopropionate) were purchased from Guangzhou Shanghai chemical technology Co.
The embodiment of the application also provides a preparation method of the polypropylene material based on dynamic/ionic crosslinking, which comprises the following steps:
mixing polypropylene, maleic anhydride and dicumyl peroxide, and then carrying out melt extrusion and granulation by a double-screw extruder with six temperature sections to obtain maleic anhydride grafted polypropylene granules;
mixing the maleic anhydride grafted polypropylene granules, metal oxide, stearic acid, polythiol compound, catalyst, halogen-free flame retardant and heat stabilizer, and then carrying out melt extrusion and granulation by a double-screw extruder with six temperature sections to obtain the modified polypropylene.
The embodiment of the application also provides another preparation method of the polypropylene material based on dynamic/ionic crosslinking, which is characterized by comprising the following steps:
mixing polypropylene, maleic anhydride, dicumyl peroxide, metal oxide, stearic acid, a polythiol compound and a catalyst, and then carrying out melt extrusion and granulation by a double-screw extruder with six temperature sections to obtain crosslinked polypropylene granules;
and mixing the crosslinked polypropylene granules, the halogen-free flame retardant and the heat stabilizer, and then carrying out melt extrusion and granulation by a double-screw extruder with six temperature sections to obtain the flame retardant.
In the two methods, the temperatures of the temperature sections in the twin-screw extruder containing six temperature sections are 190, 200 and 200 ℃ respectively, and the screw rotating speed is 200 revolutions per minute.
Examples of certain embodiments of the present application are given below, which are not intended to limit the scope of the present application.
In addition, the materials and the processing means used in the present application are common materials and familiar technical means in the art unless otherwise specified. The numerical values set forth in the following examples are reported as precisely as possible, but those of ordinary skill in the art will understand that, due to unavoidable measurement errors and experimental operating problems, each numerical value should be understood as a divisor rather than an absolute accurate numerical value.
Example 1
After 100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1 part by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, adding the mixture into a double-screw extruder with six temperature sections, carrying out melt blending, extruding, carrying out air cooling, and granulating to obtain maleic anhydride grafted polypropylene granules; further adding 5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 8 parts by weight of pentaerythritol tetra (3-mercaptopropionic acid) ester, 0.8 part by weight of 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 20 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 0.1 part by weight of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, mechanically mixing for 5min in a high-speed mixer, adding the mixture into a twin-screw extruder with six temperature sections, carrying out melt blending, extruding, air cooling and granulating to obtain the polypropylene material based on dynamic/ionic crosslinking. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 2
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride, 2 parts by weight of dicumyl peroxide, 15 parts by weight of magnesium oxide, 1 part by weight of stearic acid, 1 part by weight of pentaerythritol tetra (3-thioglycollic acid) ester and 0.1 part by weight of 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene are mechanically mixed in a high-speed mixer for 5min, after the mixture is uniformly mixed, the mixture is added into a double-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain crosslinked polypropylene granules; further adding 25 parts by weight of halogen-free flame retardant (ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer in a mass ratio of 3:1:1) and 1 part by weight of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-stearyl alcohol ester, mechanically mixing for 5min in a high-speed mixer, adding the mixture into a twin-screw extruder with six temperature sections after uniform mixing, carrying out melt blending, extruding, air cooling, granulating, and obtaining the polypropylene material based on dynamic/ionic crosslinking. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 3
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 2 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a double-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; further adding 15 parts by weight of calcium oxide, 1 part by weight of stearic acid, 8 parts by weight of phytic acid ester, 0.8 part by weight of 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 20 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 1 part by weight of tris (2, 4-di-tert-butylphenyl) phosphite, mechanically mixing for 5min in a high-speed mixer, adding the mixture into a twin-screw extruder with six temperature sections, carrying out melt blending, extruding, and carrying out air cooling and granulating to obtain the polypropylene material based on dynamic/ionic crosslinking. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 4
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1.5 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; further, 10 parts by weight of zinc oxide, 1 part by weight of stearic acid, 3 parts by weight of trimethylolpropane tris (3-mercaptopropionate), 0.3 part by weight of 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 20 parts by weight of a halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 0.5 part by weight of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester were added, after mechanical mixing in a high-speed mixer for 5min, the mixture was added into a twin-screw extruder of six temperature sections, melt blending was performed, extrusion was performed, and dynamic/ionic crosslinking-based polypropylene materials were obtained after air cooling and pelletization. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 5
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1.5 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; further adding 10 parts by weight of zinc oxide, 1 part by weight of stearic acid, 3 parts by weight of trimethylolpropane tris (3-mercaptopropionate), 0.3 part by weight of 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene, 17 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 0.5 part by weight of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, mechanically mixing in a high-speed mixer for 5min, adding the mixture into a twin-screw extruder with six temperature sections, carrying out melt blending, extruding, air cooling and granulating to obtain the polypropylene material based on dynamic/ionic crosslinking. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 6
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1.5 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; 10 parts by weight of zinc oxide, 1 part by weight of stearic acid, 3 parts by weight of trimethylolpropane tris (3-mercaptopropionate), 0.3 part by weight of 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 25 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 0.5 part by weight of 1,3, 5-tris (2-hydroxyethyl) cyanuric acid are further added, after mechanical mixing for 5min in a high-speed mixer, the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and pelleting, and the polypropylene material based on dynamic/ionic crosslinking is obtained. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 7
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1.5 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; further adding 10 parts by weight of magnesium oxide, 1 part by weight of stearic acid, 3 parts by weight of trimethylolpropane tris (3-mercaptopropionate), 0.3 part by weight of 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene, 15 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 0.5 part by weight of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, mechanically mixing in a high-speed mixer for 5min, adding the mixture into a twin-screw extruder with six temperature sections, carrying out melt blending, extruding, air cooling and granulating to obtain the polypropylene material based on dynamic/ionic crosslinking. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Example 8
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1.5 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; further adding 10 parts by weight of zinc oxide, 1 part by weight of stearic acid, 3 parts by weight of trimethylolpropane tris (3-mercaptopropionate), 0.3 part by weight of 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene, 10 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer is 3:1:1) and 0.5 part by weight of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, mechanically mixing in a high-speed mixer for 5min, adding the mixture into a twin-screw extruder with six temperature sections, carrying out melt blending, extruding, air cooling and granulating to obtain the polypropylene material based on dynamic/ionic crosslinking. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Comparative example 1
100 parts by weight of polypropylene, 17 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizing agent is 3:1:1) and 0.5 part by weight of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] are mechanically mixed for 5min in a high-speed mixer, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain polypropylene granules. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Comparative example 2
100 parts by weight of polypropylene, 25 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizing agent is 3:1:1) and 0.5 part by weight of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] are mechanically mixed for 5min in a high-speed mixer, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain polypropylene granules. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
Comparative example 3
100 parts by weight of polypropylene, 2 parts by weight of maleic anhydride and 1.5 parts by weight of dicumyl peroxide are mechanically mixed in a high-speed mixer for 5min, and then the mixture is added into a twin-screw extruder with six temperature sections for melt blending, extrusion, air cooling and granulating to obtain maleic anhydride grafted polypropylene granules; further adding 10 parts by weight of magnesium oxide, 1 part by weight of stearic acid, 15 parts by weight of halogen-free flame retardant (the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizing agent is 3:1:1) and 0.5 part by weight of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, mechanically mixing for 5min in a high-speed mixer, adding the mixture into a twin-screw extruder with six temperature sections, carrying out melt blending, extruding, air cooling and granulating to obtain the slightly ion crosslinked polypropylene granules. The temperatures of the six temperature sections of the twin-screw extruder are 190, 200 and 200 ℃ respectively, and the screw rotation speed is 200 revolutions per minute.
The polypropylene materials prepared in examples 1 to 8 and comparative examples 1 to 3 were subjected to a vertical combustion test and an oxygen index test, and the test results are shown in Table 1.
Vertical combustion test: according to the national test standard GB/T2408-2008, a CFZ-3 horizontal vertical combustor of China Jiang Ning analytical instruments is adopted to test the sample bars, and the sizes of the sample bars are 130mm multiplied by 13mm multiplied by 3mm. And recording after-flame time after the first ignition, after-flame time for the second time and dripping phenomenon in the combustion process, and evaluating the flame retardant grade of the sample.
Oxygen index test: according to the national test standard GB/T2406.2-2009, an oxygen index tester with the model JB-3 of Shanghai Jiujiujiu instruments limited is adopted to test the spline, and the spline size is 130mm multiplied by 6.5mm multiplied by 3mm.
Mechanical property test: uniaxial tensile testing was performed using a SUNSUTM2503 instrument (Sansi, china) according to national test standard GB/T1040.3-2006.
TABLE 1
Table 1 shows the oxygen index, vertical flame rating UL94, and melt dripping during vertical flame of the polypropylene materials of examples 1 to 8 and comparative examples 1 to 3. The preparation methods of the two dynamic/ionic crosslinking-based polypropylene materials can successfully prepare the dynamic/ionic crosslinking halogen-free flame-retardant anti-dripping polypropylene material. Analysis of example 5 and comparative example 1, example 6 and comparative example 2 shows that when the halogen-free flame retardant content is the same, the introduction of dynamic/ionic crosslinking gives polypropylene materials with higher oxygen index and vertical burning grade than conventional polypropylene materials, indicating that dynamic/ionic crosslinked polypropylene materials have more excellent flame retardant properties and melt drip resistance. The ionic crosslinking and dynamic crosslinking dual structure is introduced into the polypropylene material to improve the melt viscosity and the melt strength of the material, so that the flame retardant property and the anti-dripping property of the material are improved. Analysis examples 1 to 8 show that when the content of the halogen-free flame retardant is 15 to 25 parts by weight, the dynamic/ionic crosslinked polypropylene material has better anti-dripping property and flame retardant property, and the vertical burning grade is V-1 to V-0, and the oxygen index is 25.9 to 29.6 percent. Analysis of example 7 and comparative example 3 shows that further incorporation of dynamic chemical crosslinking structure is more advantageous to improve the anti-dripping and flame retardant properties of the material relative to ionic physical crosslinking structure.
Table 2 counts the mechanical properties parameters of the polypropylene materials of examples 1-8 and comparative examples 1-3, including yield strength, tensile strength and young's modulus. As can be seen from table 2, when the flame retardant content was increased to 25 parts by weight, the yield strength and young's modulus of the material were improved. Comparative example 5 and comparative example 1, example 6 and comparative example 2, it is known that when the halogen-free flame retardant content is the same, the introduction of ionic/chemical crosslinking slightly decreases the yield strength and Young's modulus of the polypropylene material, but increases the tensile strength of the material. The flame retardant property and the mechanical property are combined, so that the melt-drip resistance and the tensile strength of the polypropylene material can be improved by introducing the ionic/chemical crosslinking structure. In conclusion, by introducing an ionic crosslinking and dynamic crosslinking structure in the extrusion processing of polypropylene, the melt-drip resistance and flame retardance of the polypropylene material can be remarkably improved, and the molding processing of the material is not affected.
TABLE 2
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.
Claims (10)
1. The polypropylene material based on dynamic/ionic crosslinking is characterized by comprising the following raw materials in parts by weight:
100 parts of polypropylene, 2 parts of maleic anhydride, 1-2 parts of dicumyl peroxide, 5-15 parts of metal oxide, 1 part of stearic acid, 1-8 parts of polythiol compound, 0.1-0.8 part of catalyst, 15-25 parts of halogen-free flame retardant and 0.1-1 part of heat stabilizer.
2. The dynamic/ionic cross-linked polypropylene material according to claim 1, wherein the polythiol compound is one of pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-mercaptoacetic acid) ester, phytic acid ester, trimethylolpropane tris (3-mercaptopropionate).
3. The dynamic/ionic cross-linked polypropylene material according to claim 1, wherein the catalyst is one of 1,5, 7-triazabicyclo [4.4.0] dec-5-ene, 7-methyl-1, 5, 7-triazabicyclo [4.4.0] dec-5-ene.
4. The dynamic/ionic cross-linked polypropylene material according to claim 1, wherein the heat stabilizer is one of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tris (2, 4-di-tert-butylphenyl) phosphite and 1,3, 5-tris (2-hydroxyethyl) cyanuric acid.
5. The dynamic/ionic cross-linked polypropylene material according to claim 1, wherein the metal oxide is one of zinc oxide, magnesium oxide and calcium oxide.
6. The polypropylene material based on dynamic/ionic crosslinking according to claim 1, wherein the halogen-free flame retardant is a mixture consisting of ammonium polyphosphate, melamine cyanurate and macromolecular triazine carbonizer.
7. The polypropylene material based on dynamic/ionic crosslinking according to claim 6, wherein the mass ratio of ammonium polyphosphate, melamine cyanurate and macromolecular triazine type carbonating agent is 3:1:1.
8. a process for the preparation of a polypropylene material based on dynamic/ionic crosslinking as claimed in any one of claims 1 to 7, comprising:
mixing polypropylene, maleic anhydride and dicumyl peroxide, and then carrying out melt extrusion and granulation to obtain maleic anhydride grafted polypropylene granules;
mixing the maleic anhydride grafted polypropylene granules, metal oxide, stearic acid, polythiol compound, catalyst, halogen-free flame retardant and heat stabilizer, and performing melt extrusion and granulation to obtain the modified polypropylene.
9. A process for the preparation of a polypropylene material based on dynamic/ionic crosslinking as claimed in any one of claims 1 to 7, comprising:
mixing polypropylene, maleic anhydride, dicumyl peroxide, metal oxide, stearic acid, a polythiol compound and a catalyst, and performing melt extrusion and granulation to obtain crosslinked polypropylene granules;
mixing the crosslinked polypropylene granules, the halogen-free flame retardant and the heat stabilizer, and performing melt extrusion and granulation to obtain the flame retardant.
10. The method for preparing a polypropylene material based on dynamic/ionic crosslinking according to claim 8 or 9, wherein the melt extrusion is performed by using a twin screw extruder having six temperature sections, the temperatures of each temperature section being 190, 200 and 200 ℃, respectively, and the screw rotation speed being 200 rpm.
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