CN112778613B - High-strength PP/PE alloy free of whitening after folding and preparation method thereof - Google Patents
High-strength PP/PE alloy free of whitening after folding and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 230000002087 whitening effect Effects 0.000 title abstract description 10
- 239000004743 Polypropylene Substances 0.000 claims abstract description 105
- 229920001155 polypropylene Polymers 0.000 claims abstract description 99
- 239000004698 Polyethylene Substances 0.000 claims abstract description 78
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 26
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 26
- -1 polypropylene Polymers 0.000 claims abstract description 21
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- 230000003078 antioxidant effect Effects 0.000 claims description 17
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- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical group [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 7
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- 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 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical group CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 claims description 3
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- JMUOXOJMXILBTE-UHFFFAOYSA-N (2,2,6,6-tetramethylpiperidin-4-yl) octadecanoate Chemical group CCCCCCCCCCCCCCCCCC(=O)OC1CC(C)(C)NC(C)(C)C1 JMUOXOJMXILBTE-UHFFFAOYSA-N 0.000 description 3
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- 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 description 1
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- MFGALGYVFGDXIX-UHFFFAOYSA-N 2,3-Dimethylmaleic anhydride Chemical compound CC1=C(C)C(=O)OC1=O MFGALGYVFGDXIX-UHFFFAOYSA-N 0.000 description 1
- QZYCWJVSPFQUQC-UHFFFAOYSA-N 3-phenylfuran-2,5-dione Chemical compound O=C1OC(=O)C(C=2C=CC=CC=2)=C1 QZYCWJVSPFQUQC-UHFFFAOYSA-N 0.000 description 1
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- 150000001412 amines Chemical class 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001558 benzoic acid derivatives Chemical class 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
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- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000141 poly(maleic anhydride) Polymers 0.000 description 1
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- 238000007655 standard test method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention utilizes the technical principle of similar intermiscibility, and the PP can be well intermiscible with a large amount of PE and tightly combined together by adding the PP/PE compatilizer and the dispersing agent. The invention provides a PP/PE alloy and a preparation method thereof, wherein the PP/PE alloy comprises the following raw materials in parts by weight: 30-50 parts of polypropylene, 30-50 parts of high-density polyethylene, 2-20 parts of linear low-density polyethylene, 2-8 parts of PP/PE compatilizer, 0.2-0.6 part of dispersant and 0.2-10 parts of assistant. The PP/PE alloy obtained by the invention has the advantages of higher hardness, tensile strength and impact strength, higher heat resistance, good molding processability, good surface quality and no whitening when folded.
Description
Technical Field
The invention belongs to the technical field of polymer composite materials, relates to a PP/PE alloy and a preparation method thereof, and particularly relates to a PP/PE alloy which is high in impact strength and tensile strength, does not turn white when folded and is easy to inject, and a preparation method and application thereof.
Background
With the development of modern science and technology, the application and development of high-performance plastic composite materials are particularly important, equipment parts such as office furniture, sports protectors, daily products, electronic appliances and medical appliances have higher and higher requirements on whether alloy materials are easy to be subjected to injection molding or not, the fatigue strength, the tensile strength, the impact strength, the surface appearance quality and the like of plastic alloy parts, and meanwhile, the cost advantage is also important in order to meet more and more intense market competition.
Plastic alloys developed in some related technologies are applied to equipment parts which need to bear load and bear impact, and the plastic alloys are prone to have defects of whitish appearance and the like in the using process, and are difficult to meet the requirements of high hardness, tensile strength and impact strength, good surface quality and low price.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to develop and obtain the PP/PE alloy which has higher hardness, tensile strength and impact strength, good molding processability and surface appearance, no blushing in folding and lower price.
The technical scheme adopted by the invention is as follows: the PP/PE alloy comprises the following raw materials in parts by weight:
30-50 Parts of Polypropylene (PP),
30-50 parts of high-density polyethylene (HDPE),
2-20 parts of linear low-density polyethylene (LLDPE),
2-8 parts of PP/PE compatilizer,
0.2 to 0.6 portion of dispersant,
0.2-10 parts of an auxiliary agent.
Polypropylene (PP) has an excellent combination of properties: no toxicity, no smell and low density; the material has good mechanical properties; the molding processability is good; the corrosion-resistant adhesive has good chemical properties, almost no water absorption and good corrosion resistance, is commonly called 'plementum', but turns white when folded, and the part which needs to be bent frequently is easily turned white at the bent part. Linear Low Density Polyethylene (LLDPE) is non-toxic, odorless, good in injection molding processability, not whitish when folded in half, but very low in strength and hardness. High Density Polyethylene (HDPE) is non-toxic, odorless, superior in hardness, tensile strength and creep properties to low density polyethylene, high in melt viscosity, poor in flowability, difficult to process, and poor in resilience. Therefore, PP, HDPE or LLDPE cannot individually meet the requirements of materials with high hardness, tensile strength and impact strength, good molding processability, good surface quality and no whitening when folded in half. Therefore, it is important to develop a PP/PE alloy material with high impact strength, high tensile strength, no whitening after folding, easy injection molding, and low cost, and gradually develop specialization and high performance, reduce cost, and improve competitiveness for upgrading and upgrading office furniture, sports protectors, daily products, electronic appliances, and medical devices. However, PP cannot be blended in large amounts with PE (including LLDPE or HDPE) or it will delaminate and peel. The invention utilizes the technical principle of similar intermiscibility, adds the PP/PE compatilizer and the dispersing agent or the nucleating agent, and extrudes the mixture through each zone of the extruder, so that the PP can be well intermiscible with a large amount of PE and is tightly combined together. The PP/PE alloy obtained by the invention has the advantages of higher hardness, tensile strength and impact strength, higher heat resistance, good molding processability, good surface appearance quality and no whitening when folded.
In some embodiments of the invention, the PP/PE compatibilizer comprises one or more of polypropylene grafted maleic anhydride (PP-G-MAH), polyethylene grafted maleic anhydride (PE-G-MAH), polymaleic anhydride, dimethylmaleic anhydride, and phenylmaleic anhydride. The PP/PE compatilizer is used as a compatilizer of PP, HDPE and LLDPE, so that the compatibility among the components in the system can be well improved, and the components can be well compatible together. In some embodiments, the PP/PE compatibilizer includes at least one of polypropylene grafted maleic anhydride (PP-G-MAH) and polyethylene grafted maleic anhydride (PE-G-MAH). In some preferred embodiments, the PP/PE compatibilizer has a mass ratio of PP-G-MAH to PE-G-MAH of 1 to 3; more preferably, the mass ratio of the PP-G-MAH to the PE-G-MAH is about 1.
In some embodiments of the invention, the dispersant comprises one or more of stearic acid, zinc stearate, and calcium stearate. In some embodiments, the dispersant comprises zinc stearate.
In some embodiments, the polypropylene (PP) is K7227 and/or K7726 from guangzhou division, petrochemical, inc. The PP/PE material has better processing fluidity and the appearance of the product is also well improved by adding the PP.
In some embodiments, the High Density Polyethylene (HDPE) is selected from 5421B of kakka petrochemical company and/or 9001 of tai plastizification corporation. By adding the HDPE, the PP/PE material disclosed by the invention has better hardness, tensile strength and higher impact strength, and the condition that the product is white when folded is improved.
In some embodiments, the Linear Low Density Polyethylene (LLDPE) is M2320 and/or M2720 from guangzhou division, petrochemical, inc. By adding the LLDPE, the PP/PE material has good surface quality, better processing performance and higher impact strength, and the condition that the product is easy to fold and turn white is improved.
In some embodiments of the present invention, the auxiliary agent comprises one or more of a toughening agent, a nucleating agent, an antioxidant, a light stabilizer, an anti-aging agent, and a flame retardant.
In some embodiments, the toughening agent includes one or more of Ethylene Propylene Rubber (EPR), ethylene propylene diene monomer rubber (EPDM), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-styrene block copolymer (SEBS), butadiene rubber, and polyolefin elastomer (POE). By adding the toughening agent, the compatibility of PP, HDPE and LLDPE as well as the overall impact strength and elongation of the PP/PE alloy product are improved. In some embodiments, the toughening agent comprises one or more of EPDM, SIS, SEBS, and POE. In some embodiments, the weight portion of the toughening agent is 2 to 8 portions.
In some embodiments, the nucleating agent comprises one or more of aryl phosphate salts, substituted benzoate salts, and diphenylmethylene sorbitol (DBS) and derivatives thereof. The crystallization behavior of PP or PE resin is changed by adding the nucleating agent, the crystallization rate is accelerated, the crystallization density is increased, and the grain size is promoted to be micronized, so that the forming period is shortened, and the physical and mechanical properties such as the transparency, the surface gloss, the tensile strength, the rigidity, the heat deformation temperature, the impact resistance, the creep resistance and the like of the product are improved. In some embodiments, the nucleating agent is present in an amount of 0.2 to 0.6 parts by weight. In some embodiments, the nucleating agent is sorbitol nucleating agent NA-98 available from SoC corporation.
In some embodiments, the antioxidant comprises one or more of a hindered phenolic antioxidant, a phosphite antioxidant, and a thioether antioxidant. In some embodiments, the antioxidant is present in an amount of 0.2 to 0.6 parts by weight. In some embodiments, the light stabilizer is a hindered amine light stabilizer; derivatives of 2, 6-tetramethylpiperidine are preferred. In some embodiments, the light stabilizer is present in an amount of 0.2 to 0.6 parts by weight. The raw materials selected by the invention are all cheaper, and the obtained PP/PE alloy has higher cost performance.
The invention also provides a preparation method of the PP/PE alloy, which comprises the following steps:
the raw materials are mixed, extruded and granulated to obtain the PP/PE alloy.
Preferably, the raw materials are added to a blender; stirring and mixing. More preferably, the moderate speed stirring is carried out at 600-1200 rpm. Stirring for 2-10 min; or 2-5 min; or 2-3 min.
Preferably, the extrusion is carried out using a twin screw extruder. Preferably, the processing temperature of the extruder is 160-280 ℃. More preferably, the temperature of the head of the extruder is 220-240 ℃, the temperature of the first body area is 170-180 ℃, the temperature of the second body area is 180-200 ℃, the temperature of the third body area is 190-210 ℃, and the temperature of the fourth-ninth body area is 200-220 ℃. Preferably, the screw speed of the extruder is 200-450 rpm. Preferably, the screw diameter of the extruder may be selected from 45 mm, 50 mm, 55 mm, 65 mm or 75 mm.
Preferably, the granulation comprises: after extrusion molding, bracing, cooling and then granulating by a granulator.
Specifically, the preparation method of the PP/PE alloy comprises the following steps:
adding the raw materials into a mixer according to the formula, and stirring at a medium speed of 600-1200 rpm for 2-10 min; then adding the mixture into a double-screw extruder for extrusion, wherein the temperature of a head of the extruder is 220-240 ℃, the temperature of a first machine body area is 170-180 ℃, the temperature of a second machine body area is 180-200 ℃, the temperature of a third machine body area is 190-210 ℃, and the temperature of a fourth-ninth machine body area is 200-220 ℃; and after extrusion molding, bracing, cooling and granulating by a granulator to obtain the PP/PE alloy.
Compared with the prior art, the invention has the following beneficial effects:
the PP/PE alloy material which has high impact strength, high tensile strength, no whitening during folding, easy injection molding and low price is prepared by adopting the formula and the preparation process, has high impact strength and tensile strength, does not whiten during folding, has good fluidity and simultaneously meets the requirement of low cost.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 shows a fold-over test result of a plastic product in the related art;
FIG. 2 shows the results of the fold-in-half test of the PP/PE alloy obtained in example 1;
FIG. 3 shows the results of the double fold test of the PP/PE alloy obtained in example 2;
FIG. 4 shows the results of the double fold test of the PP/PE alloy obtained in example 3;
FIG. 5 shows the results of the double fold test of the PP/PE alloy obtained in example 4.
Detailed Description
The invention will now be further illustrated by reference to specific examples, which are intended to be illustrative of the invention and are not intended to be a further limitation of the invention.
Example 1
The PP/PE alloy is prepared from the following raw materials in parts by weight:
30 kg of polypropylene (PP),
45 kg of High Density Polyethylene (HDPE),
15 kg of Linear Low Density Polyethylene (LLDPE),
5 kg of PP/PE compatilizer,
0.4 kg of a dispersing agent is added,
4 kg of a toughening agent, namely, 4 kg of a toughening agent,
0.2 kg of a nucleating agent is added,
0.4 kg of antioxidant is added, and the weight percentage of antioxidant is 0.4 kg,
light stabilizer 0.4 kg.
Wherein PP is medium petrochemical K7227; HDPE is Zhonghai Shell 5421B; LLDPE is mesopetrochemical M2320; the PP/PE compatilizer is PP-G-MAH: PE-G-MAH =1:1; the dispersant is zinc stearate; the toughening agent is EPDM; the nucleating agent is NA-98; the antioxidant is antioxidant 1076; the light stabilizer is 2,2,6,6-tetramethyl-4-piperidyl stearate.
The preparation method of the PP/PE alloy comprises the following steps:
(1) Adding the raw materials into a mixer according to the formula, and stirring at a medium speed of 650 rpm for 4 min;
(2) Then adding the mixture into a double-screw extruder for extrusion, wherein the temperature of a head of the extruder is 220-240 ℃, the temperature of a first machine body area is 170-180 ℃, the temperature of a second machine body area is 180-200 ℃, the temperature of a third machine body area is 190-210 ℃, and the temperature of a fourth-ninth machine body area is 200-220 ℃;
(3) After extrusion molding, the PP/PE alloy of the embodiment is obtained through bracing, cooling and dicing by a dicing cutter.
Example 2
The PP/PE alloy is prepared from the following raw materials in parts by weight:
40 kg of polypropylene (PP) is added,
40 kg of High Density Polyethylene (HDPE),
10 kg of Linear Low Density Polyethylene (LLDPE),
5 kg of PP/PE compatilizer,
0.4 kg of a dispersing agent is added,
4 kg of a toughening agent, namely, 4 kg of a toughening agent,
0.2 kg of a nucleating agent is added,
0.4 kg of antioxidant is added into the mixture,
light stabilizer 0.4 kg.
Wherein PP is medium petrochemical K7227; HDPE is Chinese Taiwan sculpture 9001; LLDPE is mesopetrochemical M2320; the PP/PE compatilizer is PP-G-MAH: PE-G-MAH =1:1; the dispersant is zinc stearate; the toughening agent is SIS; the nucleating agent is NA-98; the antioxidant is antioxidant 1010; the light stabilizer is 2,2,6,6-tetramethyl-4-piperidyl stearate.
The preparation method of the PP/PE alloy comprises the following steps:
(1) Adding the raw materials into a mixer according to the formula, and stirring at a medium speed of 750 rpm for 3.5 min;
(2) Then adding the mixture into a double-screw extruder for extrusion, wherein the temperature of a head of the extruder is 220-240 ℃, the temperature of a first machine body area is 170-180 ℃, the temperature of a second machine body area is 180-200 ℃, the temperature of a third machine body area is 190-210 ℃, and the temperature of a fourth-ninth machine body area is 200-220 ℃;
(3) After extrusion molding, the PP/PE alloy of the embodiment is obtained through bracing, cooling and dicing by a dicing cutter.
Example 3
The PP/PE alloy is prepared from the following raw materials in parts by weight:
50 kg of polypropylene (PP),
35 kg of High Density Polyethylene (HDPE),
5 kg of Linear Low Density Polyethylene (LLDPE),
5 kg of PP/PE compatilizer,
0.4 kg of a dispersing agent is added,
4 kg of a toughening agent, namely 4 kg of the toughening agent,
0.2 kg of a nucleating agent is added,
0.4 kg of antioxidant is added, and the weight percentage of antioxidant is 0.4 kg,
light stabilizer 0.4 kg.
Wherein PP is mesopetrochemical K7726; HDPE is Zhonghai Shell 5421B; LLDPE is mesopetrochemical M2320; the PP/PE compatilizer is PP-G-MAH: PE-G-MAH =1:1; the dispersant is zinc stearate; the toughening agent is SEBS; the nucleating agent is NA-98; the antioxidant is antioxidant 1076; the light stabilizer is 2,2,6,6-tetramethyl-4-piperidyl stearate.
The preparation method of the PP/PE alloy comprises the following steps:
(1) Adding the raw materials into a mixer according to the formula, and stirring at a medium speed of 900 rpm for 3 min;
(2) Then adding the mixture into a double-screw extruder for extrusion, wherein the temperature of a head of the extruder is 220-240 ℃, the temperature of a first machine body area is 170-180 ℃, the temperature of a second machine body area is 180-200 ℃, the temperature of a third machine body area is 190-210 ℃, and the temperature of a fourth-ninth machine body area is 200-220 ℃;
(3) After extrusion molding, bracing, cooling and dicing by a dicing cutter are carried out, so as to obtain the PP/PE alloy of the embodiment.
Example 4
The PP/PE alloy is prepared from the following raw materials in parts by weight:
40 kg of polypropylene (PP),
35 kg of High Density Polyethylene (HDPE),
15 kg of Linear Low Density Polyethylene (LLDPE),
5 kg of PP/PE compatilizer,
0.4 kg of a dispersing agent is added,
4 kg of a toughening agent, namely, 4 kg of a toughening agent,
0.2 kg of a nucleating agent is added,
0.4 kg of antioxidant is added into the mixture,
light stabilizer 0.4 kg.
Wherein PP is mesopetrochemical K7726; HDPE is Chinese Taiwan sculpture 9001; LLDPE is mesopetrochemical M2320; the PP/PE compatilizer is PP-G-MAH: PE-G-MAH =1:1; the dispersant is zinc stearate; the toughening agent is POE; the nucleating agent is NA-98; the antioxidant is antioxidant 1010; the light stabilizer is 2, 6-tetramethyl-4-piperidine stearate.
The preparation method of the PP/PE alloy comprises the following steps:
(1) Adding the raw materials into a mixer according to the formula, and stirring at a medium speed of 1100 rpm for 2 min;
(2) Then adding the mixture into a double-screw extruder for extrusion, wherein the temperature of a head of the extruder is 220-240 ℃, the temperature of a first machine body area is 170-180 ℃, the temperature of a second machine body area is 180-200 ℃, the temperature of a third machine body area is 190-210 ℃, and the temperature of a fourth-ninth machine body area is 200-220 ℃;
(3) After extrusion molding, the PP/PE alloy of the embodiment is obtained through bracing, cooling and dicing by a dicing cutter.
The raw material component weights (kg) of the PP/PE alloys of examples 1-4 are shown in Table 1.
TABLE 1
Test example
The PP/PE alloys obtained in examples 1-4 were subjected to injection molding testing according to ASTM standard test methods, and the respective test performance structures are shown in Table 2.
TABLE 2
The middle petrochemical K7227 is subjected to injection molding to obtain a PP product, and then a folding test is carried out, and after the PP product is folded in half for 4-5 times at 360 degrees, an obvious whitening phenomenon (as shown in figure 1) appears. By the same folding method, the PP/PE alloy obtained in example 1 is folded in half at 360 degrees without whitening defects (as shown in FIG. 2), and it can be seen from Table 1 that the PP/PE alloy in example 1 has high tensile strength and impact strength, and slightly inferior elongation, forming processability and surface to those of other examples. The PP/PE alloy obtained in example 2 was almost not whitened even after being folded in half at 360 ° (as shown in fig. 3), and was slightly whitened after being folded in half many times, and it is understood from table 1 that the PP/PE alloy in example 2 has good molding processability and a good surface, but has slightly inferior bulk properties to those of other examples. The PP/PE alloy obtained in example 3 was slightly whitened after being folded in half at 360 degrees several times (as shown in FIG. 4), and it is understood from Table 1 that the PP/PE alloy of example 3 has good molding flowability, molding processability and surface. The PP/PE alloy obtained in example 4 is folded in half at 360 degrees without whitening (as shown in FIG. 5), and it is known from Table 1 that the PP/PE alloy obtained in example 4 has good molding processability and surface, low tensile strength and relatively soft physical properties. In addition, through tests, the PP/PE alloy obtained by injection molding of the material disclosed by the embodiment of the invention has good surface flatness and glossiness, and has no surface problems such as tiger stripes and the like. In general, compared with the existing product, the PP/PE alloy obtained by the embodiment of the invention has the advantages of higher impact strength and tensile strength, no blushing during folding, good fluidity, easiness in injection molding and capability of meeting the requirement of lower cost.
The above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, so that equivalent changes or modifications made by the constructions, features and principles described in the claims of the present invention should be included in the scope of the present invention.
Claims (2)
1. The PP/PE alloy is characterized by comprising the following raw materials in parts by weight:
30-50 Parts of Polypropylene (PP),
30-50 parts of high-density polyethylene,
2 to 20 parts of linear low-density polyethylene,
2-8 parts of a PP/PE compatilizer,
0.2 to 0.6 portion of dispersant,
0.2-10 parts of an auxiliary agent;
the polypropylene is K7227 or K7726 of Guangzhou division of China petrochemical industry, inc.;
the high-density polyethylene is 5421B of China sea Shell petrochemical company and the 9001 of China Tai plastic petrochemical company and the like;
the linear low density polyethylene is M2320 of Guangzhou division of China petrochemical industry, inc.;
the PP/PE compatilizer is polypropylene grafted maleic anhydride and polyethylene grafted maleic anhydride, and the mass ratio of the PP/PE compatilizer to the polyethylene grafted maleic anhydride is 1;
the dispersing agent is zinc stearate;
the auxiliary agent consists of a toughening agent, a nucleating agent, an antioxidant and a light stabilizer;
the weight portion of the toughening agent is 2-8 portions, and the toughening agent is one of ethylene propylene diene monomer, styrene-isoprene-styrene block copolymer and styrene-ethylene-butylene-styrene block copolymer;
the nucleating agent is a sorbitol nucleating agent NA-98 of Suzhongzhi GmbH;
the antioxidant is antioxidant 1076 or antioxidant 1010;
the light stabilizer is 2, 6-tetramethyl-4-piperidine stearate.
2. The method of preparing the PP/PE alloy of claim 1, comprising the steps of:
and mixing the raw materials, extruding and granulating to obtain the PP/PE alloy.
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