CN117304409A - High melt strength polypropylene and preparation method thereof - Google Patents
High melt strength polypropylene and preparation method thereof Download PDFInfo
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- CN117304409A CN117304409A CN202311410004.2A CN202311410004A CN117304409A CN 117304409 A CN117304409 A CN 117304409A CN 202311410004 A CN202311410004 A CN 202311410004A CN 117304409 A CN117304409 A CN 117304409A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 42
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 42
- -1 polypropylene Polymers 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000178 monomer Substances 0.000 claims abstract description 25
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 239000003999 initiator Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 22
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 14
- 229920002554 vinyl polymer Polymers 0.000 claims description 14
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 claims description 12
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 11
- 229920002545 silicone oil Polymers 0.000 claims description 11
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical group C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 10
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 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 5
- 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 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 4
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 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 description 3
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 3
- ACZGCWSMSTYWDQ-UHFFFAOYSA-N 3h-1-benzofuran-2-one Chemical compound C1=CC=C2OC(=O)CC2=C1 ACZGCWSMSTYWDQ-UHFFFAOYSA-N 0.000 claims description 2
- 150000001491 aromatic compounds Chemical class 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 150000002978 peroxides Chemical class 0.000 claims description 2
- 239000002530 phenolic antioxidant Substances 0.000 claims description 2
- 150000004291 polyenes Chemical class 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims 3
- 239000000155 melt Substances 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002994 raw material Substances 0.000 description 5
- 229920005629 polypropylene homopolymer Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Classifications
-
- 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
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C08G81/024—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Graft Or Block Polymers (AREA)
Abstract
The invention provides high melt strength polypropylene and a preparation method thereof, wherein the high melt strength polypropylene comprises the following components in parts by weight: 100 parts of polypropylene, 0.01-1 part of initiator, 0.1-5 parts of first grafting monomer, 0.1-0.5 part of second grafting monomer, 0.1-0.3 part of third co-grafting monomer and 0.1-0.3 part of antioxidant. The high melt strength polypropylene of the invention has the melt strength of more than 20-50cN and good mechanical property.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to high melt strength polypropylene and a preparation method thereof.
Background
The polypropylene (PP) has very wide application and rapid yield increase. However, the existing general PP has linear structures, relatively narrow molecular weight distribution and very similar melting point and softening point, so that the processing temperature range is very narrow, the melt strength is low, the melt sagging resistance is poor, and the mechanical properties are weak, thereby greatly limiting the application in the aspects of foaming, thermoforming, blow molding, extrusion coating and the like. The high melt strength polypropylene (HMSPP) obviously improves the melt strength of the linear PP, has obvious strain hardening phenomenon, and can greatly widen the application field of the linear PP.
At present, the melt strength of the linear PP is improved to prepare the high-melt-strength PP, and three aspects are started: long branched chain structure is introduced to raise molecular weight and widen molecular weight distribution. The specific implementation methods are as follows. The reactor polymerization process, as the name implies, produces HMSPP by direct polymerization in the reactor, but this process may lead to crosslinking and difficult development of polymerization process conditions. The blending method mostly adopts a melting or solution blending method, and PP and other resins are uniformly mixed under the action of stronger shearing force in processing equipment, so that the blending of the PP and the other resins is achieved, the manufacturing cost is low, and certain mechanical properties are lost. The electron irradiation method irradiates PP by electron rays to enable the molecular chain of the PP to generate free radicals so as to generate chemical reaction, and the product of the method needs subsequent treatment to eliminate residual free radicals, and the required equipment has high complex investment. CN110483829A, CN108997653a discloses that high melt strength polypropylene is prepared using irradiation technology, no chemical initiator or oxidant is used in the production process, and green pollution-free is achieved, but there is a risk in the irradiation operation process.
Therefore, further development of high melt strength polypropylene remains a major concern in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide high melt strength polypropylene and a preparation method thereof.
To achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a high melt strength polypropylene comprising the following components in parts by weight: 100 parts by weight of polypropylene, 0.01 to 1 part by weight (0.01 part by weight, 0.03 part by weight, 0.05 part by weight, 0.08 part by weight, 0.1 part by weight, 0.5 part by weight, 0.8 part by weight or 1 part by weight) of an initiator, 0.1 to 5 parts by weight (e.g., 0.1 part by weight, 0.5 part by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight or 5 parts by weight) of a first graft monomer, 0.1 to 0.5 part by weight (e.g., 0.1 part by weight, 0.2 part by weight, 0.3 part by weight, 0.4 part by weight or 0.5 part by weight) of a third co-graft monomer, and 0.1 to 0.3 part by weight (e.g., 0.1 part by weight, 0.2 part by weight or 0.3 part by weight) of an antioxidant.
As used herein, high melt strength refers to the ability of a polymer to support its own mass in the molten state, with melt strengths up to 20-50cN.
Preferably, the first grafting monomer is selected from vinyl polysiloxanes.
In the present invention, the first grafting monomer is preferably a straight-chain and branched-chain vinyl silicone oil which is kept in a liquid state at room temperature, and has the following structural formula:
wherein n and m are independently selected from integers greater than 0, such as 1, 2, 3, 4, 5, and the like.
In the present invention, the molecular weight of the vinyl silicone oil has no correlation with the vinyl content, i.e., the molecular weight and the vinyl content can be freely configured, and the viscosity is 20 to 1000cP (25 ℃ C.), for example, 20cP, 50cP, 80cP, 100cP, 300cP, 500cP, 800cP or 1000cP.
Preferably, the second grafting monomer is selected from C8-C16 mono-or polyene benzene-type aromatic compounds.
Preferably, the second grafting monomer is selected from any one or a combination of at least two of styrene, divinylbenzene or butenylstyrene, preferably styrene.
Preferably, the third co-grafting monomer is selected from trimethylolpropane triacrylate.
Preferably, the initiator is selected from any one or a combination of at least two of peroxide-based initiators.
Preferably, the initiator is selected from any one or a combination of at least two of benzoyl peroxide, dicumyl peroxide or 2, 5-dimethyl-2, 5-bis (t-butyl peroxide) hexane.
Preferably, the antioxidant is selected from the group consisting of hindered phenolic antioxidants, phosphorous acid antioxidants, benzofuranone antioxidants, and combinations of at least two thereof, preferably antioxidant 1010 and/or antioxidant 168.
In another aspect, the present invention provides a process for preparing a high melt strength polypropylene as described above, the process comprising the steps of:
and uniformly mixing polypropylene, an initiator, a first grafting monomer, a second grafting monomer, a third co-grafting monomer and an antioxidant, carrying out melt reaction, extruding, and granulating to obtain the high melt strength polypropylene.
Preferably, the mixed mixture is fed into a twin screw extruder for melt reaction, extrusion and pelletization.
Preferably, the twin screw extruder has an aspect ratio of 30 to 50, such as 30, 33, 35, 38, 40, 43, 45, 48 or 50.
Preferably, the twin screw extruder has a controlled temperature of between 80 and 400 ℃ (e.g. 80 ℃, 100 ℃, 150 ℃,200 ℃, 250 ℃, 300 ℃, 350 ℃ or 400 ℃).
Preferably, the main screw speed of the twin-screw extruder is 100-500 r/min (for example, 100r/min, 130r/min, 150r/min, 200r/min, 250r/min, 300r/min, 350r/min, 400r/min, 450r/min or 500 r/min), and the feeding screw speed is 1-100 r/min (for example, 0r/min, 3r/min, 5r/min, 10r/min, 20r/min, 30r/min, 40r/min, 50r/min, 60r/min, 70r/min, 80r/min, 90r/min or 100 r/min).
Preferably, a vacuum exhaust system is provided near the outlet of the heating section at the end of the extruder to remove unreacted monomers and better devolatilize.
Preferably, the temperature of each section of the extruder is controlled between 145 ℃ and 230 ℃, wherein the temperature of the feeding section is lower than the temperature of each other section.
Preferably, the extruder is fed at zone 1 temperatures of 145-165℃ (e.g., 145℃, 148℃, 150℃, 155℃, 158℃, 160℃, or 165℃), zone 2 temperatures of 160-200℃ (e.g., 160℃,165℃, 170℃, 175℃,180℃,190℃, or 200℃), zone 3 temperatures of 170-210℃ (e.g., 170℃, 175℃,180℃,190℃,200℃, or 210℃), zone 4 temperatures of 180-220℃ (e.g., 180℃,190℃,200℃, 210℃, or 220℃), zone 5 temperatures of 180-220℃ (e.g., 180℃,190℃,200℃, 210℃, or 220℃), zone 6 temperatures of 180-220℃ (e.g., 180℃,190℃,200℃, 210℃, or 220℃), zone 8 temperatures of 180-230℃ (e.g., 180℃,190℃,200℃, 210℃, 220℃, or 230℃).
The reaction extrusion method adopted by the invention has simple process, flexible operation and industrial implementation prospect, and can realize the one-step preparation of gel-free polypropylene with high melt strength, good color and luster and excellent mechanical property.
Compared with the prior art, the invention has the following beneficial effects:
the high melt strength polypropylene has the melt strength of more than 0.35N, good mechanical property, and the equivalent performance of the same type of products WB140 of Nordic chemical company in both the melt strength and the mechanical property, and the preparation method is simple, flexible in operation and has industrial implementation prospect.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Example 1
Raw material components (by weight portion): 100 parts of homo-polypropylene (brand 040 produced by Zhonghai petroleum Mietui petrochemical Co., ltd.); 0.7 parts of benzoyl peroxide; 2 parts of straight-chain and branched-chain vinyl silicone oil with the viscosity of 70 cP; 1 part of divinylbenzene; 1 part of trimethylolpropane triacrylate; antioxidant 1010 and antioxidant 168 each 0.2 parts.
Twin-screw extruder structure and function: the adopted extruder is a co-meshing double-screw extruder, the screw diameter is 30, the length-diameter ratio is 40, nine sections of heating and temperature control are adopted, natural exhaust is carried out in the fifth section of the extruder, and forced vacuum exhaust is carried out in the eighth section.
Preparation of high melt strength polypropylene: and uniformly mixing all the components by using a high-speed mixer, and then adding the mixture into a double-screw extruder for reactive extrusion granulation to obtain the product. The rotating speed of the screw is controlled to be 200r/min, and the heating temperature of each section of the extruder is as follows: 150 ℃,165 ℃,180 ℃,185 ℃,190 ℃,190 ℃,190 ℃,200 ℃.
Example 2
Raw material components (by weight portion): 100 parts of homo-polypropylene (brand 040 produced by Zhonghai petroleum Mietui petrochemical Co., ltd.); 0.3 parts of dicumyl peroxide; 1 part of straight-chain and branched-chain vinyl silicone oil with the viscosity of 100 cP; 1 part of butenyl styrene; 1 part of trimethylolpropane triacrylate; antioxidant 1010 and antioxidant 168 each 0.2 parts.
The procedure and implementation were the same as in example 1.
Example 3
Raw material components (by weight portion): 100 parts of homo-polypropylene (brand 040 produced by Zhonghai petroleum Mietui petrochemical Co., ltd.); 1 part of 2, 5-dimethyl-2, 5-bis (tert-butyl peroxide) hexane; 1 part of straight-chain and branched-chain vinyl silicone oil with the viscosity of 70cP and 1 part of straight-chain and branched-chain vinyl silicone oil with the viscosity of 100 cP; 1.5 parts of styrene and 1.5 parts of trimethylolpropane triacrylate; antioxidant 1010 and antioxidant 168 each 0.2 parts.
The procedure and implementation were the same as in example 1.
Comparative example 1
The raw material component contained 100 parts of homo-polypropylene only, and the preparation process was the same as in example 1.
Comparative example 2
The procedure was the same as in example 1, except that the silicone oil was free of straight-chain and branched vinyl silicone oils having a component viscosity of 70 cP.
Comparative example 3
The procedure of preparation was the same as in example 1, except that divinylbenzene and trimethylolpropane triacrylate were not contained.
Comparative example 4
The procedure was as in example 1, except that the benzoyl peroxide was not included.
Comparative example 5
Unlike example 1, no divinylbenzene was contained, trimethylolpropane triacrylate was used in an amount of 2 parts, and the other components and preparation process were the same as in example 1.
Comparative example 6
Unlike example 1, trimethylolpropane triacrylate was not contained, divinylbenzene was used in an amount of 2 parts, and other components were prepared in the same manner as in example 1.
Comparative example 7
Unlike example 2, the composition was prepared in the same manner as in example 2, except that the composition was not a straight-chain or branched-chain vinyl silicone oil having a viscosity of 100 cP.
Comparative example 8
Unlike example 3, trimethylolpropane triacrylate was replaced with the same parts by weight of pentaerythritol triacrylate.
Comparative example 9
The trimethylolpropane triacrylate used in example 1 was replaced with the same parts by weight of pentaerythritol triacrylate.
The properties of the materials obtained in the examples and comparative examples are shown in Table 1.
TABLE 1
In the data of Table 1, the melt strength was measured by a Rhedtens (Gottfert, germany) melt strength tester, and the roller rotational acceleration was 20mm/s 2 The method comprises the steps of carrying out a first treatment on the surface of the The temperature rise and fall rate of 10 ℃/min is adopted in the measurement of the crystallization temperature; MFR measured according to ASTM corresponding standards, mechanical properties measured according to national standards: tensile properties were tested according to GB1040-2006, flexural properties were tested according to GB/T9341-2008, and impact properties were tested according to ISO 179:2000. The WB140 samples in table 1 are high melt strength polypropylene products from northern european chemical company. It can be seen that the high melt strength polypropylene obtained by the method of the invention has equivalent melt strength and mechanical properties to those of similar products of Nordic chemical company.
The applicant states that the present invention is illustrated by the above examples for the high melt strength polypropylene of the present invention and the process for its preparation, but the present invention is not limited to, i.e. it is not meant that the present invention must be practiced in dependence on the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (10)
1. The high melt strength polypropylene is characterized by comprising the following components in parts by weight: 100 parts of polypropylene, 0.01-1 part of initiator, 0.1-5 parts of first grafting monomer, 0.1-0.5 part of second grafting monomer, 0.1-0.3 part of third co-grafting monomer and 0.1-0.3 part of antioxidant.
2. The high melt strength polypropylene of claim 1, wherein the first grafting monomer is selected from the group consisting of vinyl polysiloxanes;
preferably, the first grafting monomer is preferably a straight-branched vinyl silicone oil which is kept in a liquid state at room temperature;
preferably, the vinyl silicone oil has a viscosity of 20-1000cP (25 ℃).
3. The high melt strength polypropylene according to claim 1 or 2, wherein the second grafting monomer is selected from the group consisting of C8 to C16 mono-or polyene benzene-based aromatic compounds;
preferably, the second grafting monomer is selected from any one or a combination of at least two of styrene, divinylbenzene or butenylstyrene, preferably styrene.
Preferably, the third co-grafting monomer is selected from trimethylolpropane triacrylate.
4. A high melt strength polypropylene according to any one of claims 1 to 3, wherein the initiator is selected from any one or a combination of at least two of peroxide-based initiators;
preferably, the initiator is selected from any one or a combination of at least two of benzoyl peroxide, dicumyl peroxide or 2, 5-dimethyl-2, 5-bis (t-butyl peroxide) hexane.
5. The high melt strength polypropylene according to any one of claims 1 to 4, wherein the antioxidant is selected from the group consisting of hindered phenolic antioxidants, phosphorous acid antioxidants, benzofuranone antioxidants, and combinations of at least two of the foregoing antioxidants, preferably antioxidant 1010 and/or antioxidant 168.
6. The method of preparing high melt strength polypropylene according to any one of claims 1 to 5, wherein the method of preparing comprises the steps of:
and uniformly mixing polypropylene, an initiator, a first grafting monomer, a second grafting monomer, a third co-grafting monomer and an antioxidant, carrying out melt reaction, extruding, and granulating to obtain the high melt strength polypropylene.
7. The process according to claim 6, wherein the mixed mixture is fed into a twin-screw extruder, subjected to melt reaction, extruded, and pelletized.
8. The method according to claim 7, wherein the twin-screw extruder has an aspect ratio of 30 to 50;
preferably, the controllable temperature of the twin-screw extruder is 80-400 ℃.
9. The preparation method according to claim 7, wherein the main screw speed of the twin-screw extruder is 100-500 r/min and the feeding screw speed is 1-100 r/min;
preferably, a vacuum exhaust system is arranged at the position close to the outlet of the tail end heating section of the extruder;
preferably, the temperature of each section of the extruder is controlled between 145 ℃ and 230 ℃, wherein the temperature of the feeding section is lower than the temperature of each other section.
10. The process according to claim 7, wherein the temperature in zone 1, zone 2, zone 3, zone 180-220, zone 5, zone 6, zone 180-220, zone 7, zone 180-220, zone 8, zone 180-230 of the extruder is controlled at 145-165 ℃, zone 2, zone 160-200 ℃, zone 3, zone 170-210 ℃, zone 4, zone 180-220.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311410004.2A CN117304409A (en) | 2023-10-27 | 2023-10-27 | High melt strength polypropylene and preparation method thereof |
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| CN202311410004.2A CN117304409A (en) | 2023-10-27 | 2023-10-27 | High melt strength polypropylene and preparation method thereof |
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| CN117304409A true CN117304409A (en) | 2023-12-29 |
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| Country | Link |
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- 2023-10-27 CN CN202311410004.2A patent/CN117304409A/en active Pending
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