CN113637190A - Modified polypropylene master batch and preparation method thereof - Google Patents
Modified polypropylene master batch and preparation method thereof Download PDFInfo
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- CN113637190A CN113637190A CN202111068140.9A CN202111068140A CN113637190A CN 113637190 A CN113637190 A CN 113637190A CN 202111068140 A CN202111068140 A CN 202111068140A CN 113637190 A CN113637190 A CN 113637190A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 108
- -1 polypropylene Polymers 0.000 title claims abstract description 106
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 106
- 239000004594 Masterbatch (MB) Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000002667 nucleating agent Substances 0.000 claims abstract description 44
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 33
- 229920013716 polyethylene resin Polymers 0.000 claims abstract description 31
- 238000002156 mixing Methods 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 24
- 239000008187 granular material Substances 0.000 claims description 18
- 238000001125 extrusion Methods 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 14
- 230000003179 granulation Effects 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 13
- 150000002910 rare earth metals Chemical class 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 8
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 5
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 5
- 239000000600 sorbitol Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 239000002861 polymer material Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000001746 injection moulding Methods 0.000 description 6
- 229920006465 Styrenic thermoplastic elastomer Polymers 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 241000190070 Sarracenia purpurea Species 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 235000011888 snacks Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of high polymer materials, in particular to a modified polypropylene master batch and a preparation method thereof. The invention provides a modified polypropylene master batch, which comprises the following components: 50 wt% -80 wt% of polypropylene mixed material; 5-25 wt% of low-pressure polyethylene resin; 10 wt% -30 wt% of styrene thermoplastic elastomer; the sum of the using amount of the components is 100 percent; the polypropylene mixed material comprises homopolymerized polypropylene and a nucleating agent. In the invention, the specific polypropylene mixed material is matched with the low-pressure polyethylene resin and the styrene thermoplastic elastomer to perform synergistic action under a certain proportioning condition, and the finally obtained modified polypropylene master batch has better transparency and mechanical property.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a modified polypropylene master batch and a preparation method thereof.
Background
The thin-wall injection molding product comprises a high-tightness ultrathin injection molding piece, such as a mobile phone rear cover, a DVD packaging box and the like, and daily consumer goods, such as a disposable thin-wall snack box, a water cup and the like. At present, most of domestic thin-wall injection molding products depend on imports, and the production cost is high due to the high price of imported materials, so researchers are constantly dedicated to developing new materials suitable for the thin-wall injection molding products.
The thin-wall injection molding product directly made of PP is too brittle and has insufficient toughness, and after modification by adding PE, the thin-wall injection molding product has good toughness but poor transparency.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a modified polypropylene masterbatch and a preparation method thereof, and the modified polypropylene masterbatch provided by the present invention has excellent transparency and mechanical properties.
The invention provides a modified polypropylene master batch, which comprises the following components:
50 wt% -80 wt% of polypropylene mixed material;
5-25 wt% of low-pressure polyethylene resin;
10 wt% -30 wt% of styrene thermoplastic elastomer;
the sum of the using amount of the components is 100 percent;
the polypropylene mixed material comprises homopolymerized polypropylene and a nucleating agent.
Preferably, the mass ratio of the homopolymerized polypropylene to the nucleating agent is 93-97: 3 to 7.
Preferably, the nucleating agent comprises at least one of a rare earth nucleating agent, a sorbitol nucleating agent and an organophosphate nucleating agent.
Preferably, the low-pressure polyethylene resin has a melt index of 2-10 g/10 min.
Preferably, the styrene thermoplastic elastomer contains styrene in an amount of 30 to 60% by mass.
Preferably, the Shore hardness of the styrene thermoplastic elastomer is 28-95, the tensile strength is 2.1-34 MPa, and the elongation is 250-1300%.
Preferably, the service temperature of the styrene thermoplastic elastomer is 50-220 ℃, and the density is 0.9-1.1 g/cm3。
The invention also provides a preparation method of the modified polypropylene master batch, which comprises the following steps:
A) stirring and mixing the homopolymerized polypropylene and the nucleating agent, and then extruding and granulating to obtain granules;
B) stirring and mixing the granules obtained in the step A), a polypropylene mixed material, low-pressure polyethylene resin and a styrene thermoplastic elastomer, cooling to 55-65 ℃, and then extruding and granulating to obtain modified polypropylene master batches.
Preferably, in the step A), the rotating speed of stirring and mixing is 180-220 r/min, and the time is 3-5 min;
the extrusion granulation is carried out in a double-screw extruder;
the temperature of a first zone of the double-screw extruder is 160-170 ℃, the temperature of a second zone is 230-250 ℃, the temperature of a third zone is 230-250 ℃, the temperature of a fourth zone is 230-250 ℃, the temperature of a fifth zone is 230-250 ℃, the temperature of a sixth zone is 230-250 ℃, the temperature of a seventh zone is 200-210 ℃, the temperature of an eighth zone is 200-210 ℃, the temperature of a ninth zone is 200-210 ℃ and the temperature of a head is 210-220 ℃;
the length-diameter ratio of the screws of the double-screw extruder is 48: 1.
preferably, in the step B), the rotating speed of stirring and mixing is 180-220 r/min, and the time is 3-5 min;
the extrusion granulation is carried out in a double-screw extruder;
the temperature of a first zone of the double-screw extruder is 160-170 ℃, the temperature of a second zone is 230-250 ℃, the temperature of a third zone is 230-250 ℃, the temperature of a fourth zone is 230-250 ℃, the temperature of a fifth zone is 230-250 ℃, the temperature of a sixth zone is 230-250 ℃, the temperature of a seventh zone is 200-210 ℃, the temperature of an eighth zone is 200-210 ℃, the temperature of a ninth zone is 200-210 ℃ and the temperature of a head is 210-220 ℃;
the length-diameter ratio of the screws of the double-screw extruder is 48: 1.
the invention provides a modified polypropylene master batch, which comprises the following components: 50 wt% -80 wt% of polypropylene mixed material; 5-25 wt% of low-pressure polyethylene resin; 10 wt% -30 wt% of styrene thermoplastic elastomer; the sum of the using amount of the components is 100 percent; the polypropylene mixed material comprises homopolymerized polypropylene and a nucleating agent. In the invention, the specific polypropylene mixed material is matched with the low-pressure polyethylene resin and the styrene thermoplastic elastomer to perform synergistic action under a certain proportioning condition, and the finally obtained modified polypropylene master batch has better transparency and mechanical property.
Experimental results show that the modified polypropylene master batch provided by the invention has high transparency, the haze is less than 37%, the impact strength is greater than 2.7MPa, the flexural modulus is greater than 1650MPa, and the transparency and the mechanical property of the modified polypropylene master batch are excellent.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a modified polypropylene master batch, which comprises the following components:
50 wt% -80 wt% of polypropylene mixed material;
5-25 wt% of low-pressure polyethylene resin;
10 wt% -30 wt% of styrene thermoplastic elastomer;
the sum of the using amount of the components is 100 percent;
the polypropylene mixed material comprises homopolymerized polypropylene and a nucleating agent.
The modified polypropylene master batch provided by the invention comprises a polypropylene mixed material. In the modified polypropylene master batch, the content of the polypropylene mixed material is 50 wt% -80 wt%. In certain embodiments of the invention, the polypropylene blend is present in an amount of 80 wt%, 70 wt%, 60 wt%, or 50 wt%.
In the invention, the polypropylene mixed material comprises homopolymerized polypropylene and a nucleating agent. In certain embodiments of the present invention, the mass ratio of the homopolypropylene to the nucleating agent is 93-97: 3 to 7. In certain embodiments, the homopolypropylene and the nucleating agent are present in a mass ratio of 95: 5.
the source and type of the homo-polypropylene are not particularly limited in the present invention, and can be generally commercially available.
In certain embodiments of the present invention, the nucleating agent comprises at least one of a rare earth nucleating agent, a sorbitol nucleating agent, and an organophosphate nucleating agent. The sources of the rare earth nucleating agent, the sorbitol nucleating agent and the organic phosphate nucleating agent are not particularly limited, and the rare earth nucleating agent, the sorbitol nucleating agent and the organic phosphate nucleating agent can be generally sold in the market.
The modified polypropylene master batch provided by the invention also comprises low-pressure polyethylene resin. In the modified polypropylene master batch, the content of the low-pressure polyethylene resin is 5 wt% -25 wt%. In certain embodiments, the low-pressure polyethylene resin is present in an amount of 10 wt%, 5 wt%, 20 wt%, or 25 wt%.
In certain embodiments of the present invention, the low pressure polyethylene resin has a melt index of 2 to 10g/10 min. In certain embodiments, the low pressure polyethylene resin has a melt index of 7g/10min, 5g/10min, 4g/10min, or 3g/10 min. The source of the low-pressure polyethylene resin is not particularly limited in the present invention, and may be generally commercially available.
The modified polypropylene master batch provided by the invention also comprises a styrene thermoplastic elastomer. In the modified polypropylene master batch, the content of the styrene thermoplastic elastomer is 10 wt% -30 wt%. In certain embodiments of the invention, the styrenic thermoplastic elastomer is present in an amount of 10 wt%, 20 wt%, or 25 wt%.
In some embodiments of the present invention, the styrene thermoplastic elastomer has a shore hardness of 28 to 95, a tensile strength of 2.1 to 34MPa, and an elongation of 250 to 1300%. In certain embodiments, the styrene thermoplastic elastomer has a shore hardness of 32, 35, 50, or 29. In certain embodiments, the styrenic thermoplastic elastomer has a tensile strength of 28MPa, 25MPa, 20MPa, or 30 MPa. In certain embodiments, the styrenic thermoplastic elastomer has an elongation of 1000%, 950%, 750%, or 1200%.
In some embodiments of the present invention, the styrene thermoplastic elastomer is used at a temperature of 50 to 220 ℃ and has a density of 0.9 to 1.1g/cm3. In certain embodiments, the styrenic thermoplastic elastomer is used at a temperature of 160 ℃, 150 ℃, or 120 ℃. In certain embodiments, the styrenic thermoplasticThe density of the elastomer was 1.03g/cm3、1.02g/cm3、1.05g/cm3Or 1.06g/cm3。
The source of the styrene thermoplastic elastomer in the present invention is not particularly limited, and it may be generally commercially available.
The invention also provides a preparation method of the modified polypropylene master batch, which comprises the following steps:
A) stirring and mixing the homopolymerized polypropylene and the nucleating agent, and then extruding and granulating to obtain granules;
B) stirring and mixing the granules obtained in the step A), a polypropylene mixed material, low-pressure polyethylene resin and a styrene thermoplastic elastomer, cooling to 55-65 ℃, and then extruding and granulating to obtain modified polypropylene master batches.
In the preparation method of the modified polypropylene master batch provided by the invention, the adopted raw material components and the proportion are the same as above, and are not described again.
The invention firstly stirs and mixes the homopolymerized polypropylene and the nucleating agent, and then extrudes and granulates to obtain granules.
In some embodiments of the invention, the rotation speed of the stirring and mixing is 180 to 220r/min, and the time is 3 to 5 min. In certain embodiments of the invention, the agitation mixing is performed in a high speed mixer-blender. In certain embodiments, the rotational speed of the agitating mixing is 200 r/min. In certain embodiments, the time of the stirring and mixing is 3 min.
In certain embodiments of the invention, the extrusion granulation is performed in a twin screw extruder. The temperature of a first zone of the double-screw extruder is 160-170 ℃, the temperature of a second zone is 230-250 ℃, the temperature of a third zone is 230-250 ℃, the temperature of a fourth zone is 230-250 ℃, the temperature of a fifth zone is 230-250 ℃, the temperature of a sixth zone is 230-250 ℃, the temperature of a seventh zone is 200-210 ℃, the temperature of an eighth zone is 200-210 ℃, the temperature of a ninth zone is 200-210 ℃ and the temperature of a head is 210-220 ℃. The length-diameter ratio of the screws of the double-screw extruder is 48: 1.
in certain embodiments, the twin screw extruder has a first zone temperature of 165 ℃, a second zone temperature of 240 ℃, a third zone temperature of 240 ℃, a fourth zone temperature of 240 ℃, a fifth zone temperature of 240 ℃, a sixth zone temperature of 240 ℃, a seventh zone temperature of 240 ℃, an eighth zone temperature of 240 ℃, a ninth zone temperature of 240 ℃ and a head temperature of 215 ℃.
And after obtaining the granules, stirring and mixing the granules, the polypropylene mixed material, the low-pressure polyethylene resin and the styrene thermoplastic elastomer, cooling to 55-65 ℃, and then extruding and granulating to obtain the modified polypropylene master batch.
In some embodiments of the invention, the rotation speed of the stirring and mixing is 180 to 220r/min, and the time is 3 to 5 min. In certain embodiments of the invention, the agitation mixing is performed in a high speed mixer-blender. In certain embodiments, the rotational speed of the agitating mixing is 200 r/min. In certain embodiments, the time of the stirring and mixing is 3 min.
In certain embodiments of the invention, the cooled temperature is 60 ℃.
In certain embodiments of the invention, the extrusion granulation is performed in a twin screw extruder.
In some embodiments of the invention, the temperature of the first zone of the twin-screw extruder is 160-170 ℃, the temperature of the second zone is 230-250 ℃, the temperature of the third zone is 230-250 ℃, the temperature of the fourth zone is 230-250 ℃, the temperature of the fifth zone is 230-250 ℃, the temperature of the sixth zone is 230-250 ℃, the temperature of the seventh zone is 200-210 ℃, the temperature of the eighth zone is 200-210 ℃, the temperature of the ninth zone is 200-210 ℃ and the temperature of the head is 210-220 ℃. The length-diameter ratio of the screws of the double-screw extruder is 48: 1.
in certain embodiments, the twin screw extruder has a first zone temperature of 165 ℃, a second zone temperature of 240 ℃, a third zone temperature of 240 ℃, a fourth zone temperature of 240 ℃, a fifth zone temperature of 240 ℃, a sixth zone temperature of 240 ℃, a seventh zone temperature of 240 ℃, an eighth zone temperature of 240 ℃, a ninth zone temperature of 240 ℃ and a head temperature of 215 ℃.
The source of the above-mentioned raw materials is not particularly limited in the present invention, and may be generally commercially available.
In order to further illustrate the present invention, the following examples are provided to describe the modified polypropylene master batch and the preparation method thereof in detail, but should not be construed as limiting the scope of the present invention.
Example 1
A modified polypropylene masterbatch comprising:
80 wt% of polypropylene mixed material;
10 wt% of low-pressure polyethylene resin;
10 wt% of styrene thermoplastic elastomer;
the polypropylene mixed material comprises homopolymerized polypropylene and a rare earth nucleating agent, wherein the mass ratio of the homopolymerized polypropylene to the rare earth nucleating agent is 95: 5;
the low-pressure polyethylene resin has a melt index of 7g/10 min;
the Shore hardness of the styrene thermoplastic elastomer is 32, the tensile strength is 28MPa, the elongation is 1000%, the service temperature of the styrene thermoplastic elastomer is 160 ℃, and the density is 1.03g/cm3。
The preparation method of the modified polypropylene master batch comprises the following steps:
1) stirring and mixing the homopolymerized polypropylene and the nucleating agent in a high-speed mixer for 3min at a speed of 200r/min, and then extruding and granulating to obtain granules;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃; the length-diameter ratio of the screws of the double-screw extruder is 48: 1;
2) stirring and mixing the granules obtained in the step 1), the polypropylene mixed material, the low-pressure polyethylene resin and the styrene thermoplastic elastomer in a high-speed mixer at a speed of 200r/min for 3min, cooling to 60 ℃, and then extruding and granulating to obtain modified polypropylene master batches;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃. The length-diameter ratio of the screws of the double-screw extruder is 48: 1.
example 2
A modified polypropylene masterbatch comprising:
70 wt% of polypropylene mixed material;
5 wt% of low-pressure polyethylene resin;
25 wt% of styrene thermoplastic elastomer;
the polypropylene mixed material comprises homopolymerized polypropylene and a rare earth nucleating agent, wherein the mass ratio of the homopolymerized polypropylene to the rare earth nucleating agent is 95: 5;
the low-pressure polyethylene resin has a melt index of 5g/10 min;
the Shore hardness of the styrene thermoplastic elastomer is 50, the tensile strength is 25MPa, the elongation is 950%, the service temperature of the styrene thermoplastic elastomer is 150 ℃, and the density is 1.02g/cm3。
The preparation method of the modified polypropylene master batch comprises the following steps:
1) stirring and mixing the homopolymerized polypropylene and the nucleating agent in a high-speed mixer for 3min at a speed of 200r/min, and then extruding and granulating to obtain granules;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃; the length-diameter ratio of the screws of the double-screw extruder is 48: 1;
2) stirring and mixing the granules obtained in the step 1), the polypropylene mixed material, the low-pressure polyethylene resin and the styrene thermoplastic elastomer in a high-speed mixer at a speed of 200r/min for 3min, cooling to 60 ℃, and then extruding and granulating to obtain modified polypropylene master batches;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃. The length-diameter ratio of the screws of the double-screw extruder is 48: 1.
example 3
A modified polypropylene masterbatch comprising:
60 wt% of polypropylene mixed material;
20 wt% of low-pressure polyethylene resin;
20 wt% of styrene thermoplastic elastomer;
the polypropylene mixed material comprises homopolymerized polypropylene and a rare earth nucleating agent, wherein the mass ratio of the homopolymerized polypropylene to the rare earth nucleating agent is 95: 5;
the low-pressure polyethylene resin has a melt index of 4g/10 min;
the Shore hardness of the styrene thermoplastic elastomer is 35, the tensile strength is 20MPa, the elongation is 750 percent, the service temperature of the styrene thermoplastic elastomer is 160 ℃, and the density is 1.05g/cm3。
The preparation method of the modified polypropylene master batch comprises the following steps:
1) stirring and mixing the homopolymerized polypropylene and the nucleating agent in a high-speed mixer for 3min at a speed of 200r/min, and then extruding and granulating to obtain granules;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃; the length-diameter ratio of the screws of the double-screw extruder is 48: 1;
2) stirring and mixing the granules obtained in the step 1), the polypropylene mixed material, the low-pressure polyethylene resin and the styrene thermoplastic elastomer in a high-speed mixer at a speed of 200r/min for 3min, cooling to 60 ℃, and then extruding and granulating to obtain modified polypropylene master batches;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃. The length-diameter ratio of the screws of the double-screw extruder is 48: 1.
example 4
A modified polypropylene masterbatch comprising:
50 wt% of polypropylene mixed material;
25 wt% of low-pressure polyethylene resin;
25 wt% of styrene thermoplastic elastomer;
the polypropylene mixed material comprises homopolymerized polypropylene and a rare earth nucleating agent, wherein the mass ratio of the homopolymerized polypropylene to the rare earth nucleating agent is 95: 5;
the low-pressure polyethylene resin has a melt index of 3g/10 min;
the Shore hardness of the styrene thermoplastic elastomer is 29, the tensile strength is 30MPa, the elongation is 1200%, the service temperature of the styrene thermoplastic elastomer is 120 ℃, and the density is 1.06g/cm3。
The preparation method of the modified polypropylene master batch comprises the following steps:
1) stirring and mixing the homopolymerized polypropylene and the nucleating agent in a high-speed mixer for 3min at a speed of 200r/min, and then extruding and granulating to obtain granules;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃. The length-diameter ratio of the screws of the double-screw extruder is 48: 1;
2) stirring and mixing the granules obtained in the step 1), the polypropylene mixed material, the low-pressure polyethylene resin and the styrene thermoplastic elastomer in a high-speed mixer at a speed of 200r/min for 3min, cooling to 60 ℃, and then extruding and granulating to obtain modified polypropylene master batches;
the extrusion granulation is carried out in a double-screw extruder; the first zone temperature of the double-screw extruder is 165 ℃, the second zone temperature is 240 ℃, the third zone temperature is 240 ℃, the fourth zone temperature is 240 ℃, the fifth zone temperature is 240 ℃, the sixth zone temperature is 240 ℃, the seventh zone temperature is 240 ℃, the eighth zone temperature is 240 ℃, the ninth zone temperature is 240 ℃, and the head temperature is 215 ℃; the length-diameter ratio of the screws of the double-screw extruder is 48: 1.
example 5
Mixing the modified polypropylene master batch prepared in the example 1 and the homo-polypropylene according to the mass ratio of 10: 90 mixing and tabletting to obtain a tablet 1 having a size of (70 mm. times.40 mm. times.5 mm); examples 2-4 this was repeated to give tablets of the same size, example 2 for tablet 2, example 3 for tablet 3 and example 4 for tablet 4.
The obtained tablets were subjected to the property test, and the results are shown in Table 1.
Pure PP and homopolymerized polypropylene are mixed according to the mass ratio of 10: 90 to give tablets of the same size, i.e. comparative tablets.
TABLE 1 evaluation results of tabletting properties
As can be seen from Table 1, the modified polypropylene master batch prepared by the invention has high transparency, haze of less than 37%, impact strength of more than 2.7MPa, flexural modulus of more than 1650MPa, and excellent transparency and toughness.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A modified polypropylene masterbatch comprising:
50 wt% -80 wt% of polypropylene mixed material;
5-25 wt% of low-pressure polyethylene resin;
10 wt% -30 wt% of styrene thermoplastic elastomer;
the sum of the using amount of the components is 100 percent;
the polypropylene mixed material comprises homopolymerized polypropylene and a nucleating agent.
2. The modified polypropylene masterbatch according to claim 1, wherein the mass ratio of the homo-polypropylene to the nucleating agent is 93-97: 3 to 7.
3. The modified polypropylene masterbatch of claim 1, wherein the nucleating agent comprises at least one of a rare earth nucleating agent, a sorbitol nucleating agent, and an organophosphate nucleating agent.
4. The modified polypropylene masterbatch according to claim 1, wherein the low-pressure polyethylene resin has a melt index of 2 to 10g/10 min.
5. The modified polypropylene masterbatch according to claim 1, wherein the styrene thermoplastic elastomer contains styrene in an amount of 30-60% by mass.
6. The modified polypropylene masterbatch of claim 1, wherein the styrene thermoplastic elastomer has a Shore hardness of 28-95, a tensile strength of 2.1-34 MPa, and an elongation of 250-1300%.
7. Root of herbaceous plantThe modified polypropylene masterbatch of claim 1, wherein the styrene thermoplastic elastomer is used at a temperature of 50-220 ℃ and a density of 0.9-1.1 g/cm3。
8. The method for preparing the modified polypropylene master batch of claim 1, comprising the following steps:
A) stirring and mixing the homopolymerized polypropylene and the nucleating agent, and then extruding and granulating to obtain granules;
B) stirring and mixing the granules obtained in the step A), a polypropylene mixed material, low-pressure polyethylene resin and a styrene thermoplastic elastomer, cooling to 55-65 ℃, and then extruding and granulating to obtain modified polypropylene master batches.
9. The preparation method of claim 8, wherein in the step A), the rotation speed of stirring and mixing is 180-220 r/min, and the time is 3-5 min;
the extrusion granulation is carried out in a double-screw extruder;
the temperature of a first zone of the double-screw extruder is 160-170 ℃, the temperature of a second zone is 230-250 ℃, the temperature of a third zone is 230-250 ℃, the temperature of a fourth zone is 230-250 ℃, the temperature of a fifth zone is 230-250 ℃, the temperature of a sixth zone is 230-250 ℃, the temperature of a seventh zone is 200-210 ℃, the temperature of an eighth zone is 200-210 ℃, the temperature of a ninth zone is 200-210 ℃ and the temperature of a head is 210-220 ℃;
the length-diameter ratio of the screws of the double-screw extruder is 48: 1.
10. the preparation method of claim 8, wherein in the step B), the rotation speed of stirring and mixing is 180-220 r/min, and the time is 3-5 min;
the extrusion granulation is carried out in a double-screw extruder;
the temperature of a first zone of the double-screw extruder is 160-170 ℃, the temperature of a second zone is 230-250 ℃, the temperature of a third zone is 230-250 ℃, the temperature of a fourth zone is 230-250 ℃, the temperature of a fifth zone is 230-250 ℃, the temperature of a sixth zone is 230-250 ℃, the temperature of a seventh zone is 200-210 ℃, the temperature of an eighth zone is 200-210 ℃, the temperature of a ninth zone is 200-210 ℃ and the temperature of a head is 210-220 ℃;
the length-diameter ratio of the screws of the double-screw extruder is 48: 1.
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| CN101320789A (en) * | 2008-07-07 | 2008-12-10 | 风帆股份有限公司 | High ductility accumulator housing and preparation method |
| CN102002186A (en) * | 2010-11-02 | 2011-04-06 | 苏州旭光聚合物有限公司 | Mineral filled low-shrinkage modified polypropylene composite material and preparation method thereof |
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