CN116063795B - High-gloss high-toughness polypropylene composition and polypropylene material prepared from same - Google Patents
High-gloss high-toughness polypropylene composition and polypropylene material prepared from same Download PDFInfo
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 19
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- 229910052582 BN Inorganic materials 0.000 claims abstract description 18
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
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- 239000003963 antioxidant agent Substances 0.000 claims description 40
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- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 2
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 2
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 2
- VOYADQIFGGIKAT-UHFFFAOYSA-N 1,3-dibutyl-4-hydroxy-2,6-dioxopyrimidine-5-carboximidamide Chemical compound CCCCn1c(O)c(C(N)=N)c(=O)n(CCCC)c1=O VOYADQIFGGIKAT-UHFFFAOYSA-N 0.000 claims 1
- SSADPHQCUURWSW-UHFFFAOYSA-N 3,9-bis(2,6-ditert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Chemical compound CC(C)(C)C1=CC(C)=CC(C(C)(C)C)=C1OP1OCC2(COP(OC=3C(=CC(C)=CC=3C(C)(C)C)C(C)(C)C)OC2)CO1 SSADPHQCUURWSW-UHFFFAOYSA-N 0.000 claims 1
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims 1
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- 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 description 3
- 238000012360 testing method Methods 0.000 description 3
- 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 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 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 description 2
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Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a high-gloss high-toughness polypropylene composition and a polypropylene material prepared from the same, which are mainly used for the production of small household appliances. According to the high-gloss high-toughness polypropylene resin material, the impact-resistant copolymerized polypropylene is taken as the base resin, and is synergistically blended with the linear low-density polyethylene on the premise of adding the nucleating agent, the lubricant and the hexagonal boron nitride, so that the toughness and the glossiness of the polypropylene resin material are obviously improved, the rigidity and toughness balance effect of the resin material is achieved, and the shrinkage rate is obviously reduced. And the glossiness of the resin material is not reduced after multiple times of high-temperature granulation, and the resin can be directly recycled, so that the resin material has good comprehensive performance and has the advantage of green and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a high-gloss high-toughness polypropylene composition and a polypropylene material prepared from the same, which are mainly used for the production of small household appliances.
Background
Polypropylene (PP) is one of the most rapidly developed varieties in commercial plastics, has the advantages of good comprehensive mechanical properties, no toxicity, easy processing, chemical resistance and the like, and is easy to obtain and low in cost, so that the PP is widely applied to the fields of household appliances, automobiles, packaging and the like. Along with the improvement of the appearance requirements of people on products, the high-gloss PP is gradually replacing the traditional high-gloss plastics such as H-IPS, ABS and the like, and is applied to parts or products with heat resistance, glossiness and certain hardness requirements on the plastics, such as small household appliances such as electric cookers, electric irons, electric kettles, electric hair dryers, microwave ovens, heaters, electric toasters and the like. The development and production of high-gloss heat-resistant PP for small household appliances will have very bright prospects as the largest small household appliances in the world are produced, consumed and exported in China. At present, the technology for producing the high-gloss PP at home and abroad has a certain gap, and generally foreign manufacturers mainly adjust polymerization parameters to meet the product index requirements, and domestic manufacturers mainly adjust auxiliary agents.
At present, the plastic yield reaches 4 hundred million tons each year, 120 hundred million tons of waste plastic are expected to be produced worldwide by 2050, and at present, more than 800 ten thousand tons of plastic enter the ocean every year, if not limited, and more plastic waste in the ocean than fish are expected to exist by 2050. In recent years, international top publications have successively published articles on pollution of plastic particles to organisms and drinking water in the sea and river, and have attracted public attention to plastic pollution. In order to solve the problem of plastic contamination, scientific researchers have made diligent efforts. Therefore, mechanical recycling of the hard-to-degrade resin products is critical to reduce environmental pollution.
The high-gloss flame-retardant polypropylene composite material disclosed in Chinese patent CN102690464A comprises the following raw materials: the polypropylene product prepared by the scheme has better flame retardant property, but the glossiness of the resin product can only achieve the effect of 'visual highlight without pits', but cannot form the effect of high glossiness. The polypropylene composition with high modulus, high toughness and high gloss is prepared by mixing, extruding and granulating block copolymerized polypropylene, high crystallization copolymerized polypropylene, inorganic mineral and impact modifier, and the polypropylene product prepared by the scheme has higher modulus and low-temperature impact, but the glossiness is only below 80 percent and cannot meet the requirement of high gloss effect.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a polypropylene resin composition which has high gloss, high toughness, low shrinkage and no reduction in gloss after repeated high-temperature mixing granulation, and further discloses a preparation method and application thereof.
In order to solve the technical problems, the high-gloss high-toughness polypropylene composition provided by the invention comprises the following components in parts by weight:
Specifically, the impact copolymer polypropylene has a melt Mass Flow Rate (MFR) of 8-15g/10min, a melting temperature range of 160-168 ℃, and a mass content of ethylene of 4-6%.
Specifically, the linear low density polyethylene has a density of 0.922-0.926g/cm 3, a melt mass flow rate of 16-22g/10min, and a molecular weight distribution of 4.2-4.8.
Specifically, the antioxidant comprises a main antioxidant and an auxiliary antioxidant, and the mass ratio of the main antioxidant to the auxiliary antioxidant is preferably 1:1, a mixture of two or more of the above-mentioned materials;
The primary antioxidants include [3- (3, 5-di-t-butyl-4-hydroxycyclohexyl) propionate ] (1010), [1,3,5, -tris (3, 5-di-t-butyl, 4-hydroxybenzyl) s-triazine ] (3114), [3,3,3,5,5,5-hexat-butyl-a, a- (1, 3, 5-trimethylbenzene-2, 4, 6-triyl) tris-p-cresol ] (1330), and preferably antioxidant 1010;
The secondary antioxidants include [ tris (2, 4-di-t-butylphenyl) phosphite ] (168), [ bis (2, 4-di-t-butylphenol) pentaerythritol diphosphite ] (622), [ bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite ] (PEP 36), and preferably antioxidant 168.
Specifically, the stiffening nucleating agent comprises sorbitol derivatives, organic phosphates, rosin or polymer nucleating agents. The stiffening nucleating agent not only can increase the rigidity of polypropylene, but also can improve the crystallinity of PP resin, and has a great improvement effect on gloss.
Specifically, the boron nitride is hexagonal boron nitride, and the particle size is 0.03-0.1 mu m. Preferably, the purity of the hexagonal boron nitride powder is 99%, the crystal structure is flaky, and the aspect ratio is 13:1.
In particular, the lubricant comprises Glycerol Monostearate (GMS), and the component has lubricating effect, and can reduce friction between an injection molding product and a mold and between the injection molding product and a die opening and reduce surface scratches.
The invention also discloses a high-gloss high-toughness polypropylene resin material prepared from the polypropylene composition. The polypropylene resin material is prepared by taking impact copolymer polypropylene as base resin, adding linear low-density polyethylene, stiffening nucleating agent and lubricant, uniformly mixing by a high-speed stirrer, and extruding and granulating by a double screw for three times.
The invention also discloses a method for preparing the high-gloss high-toughness polypropylene resin material, which comprises the following steps:
(1) Taking a selected amount of the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, a part of antioxidant and boron nitride, uniformly mixing, adding into a double-screw extruder for mixing, and performing first extrusion granulation;
(2) Adding a selected amount of the lubricant and the rest of the antioxidant into the granules obtained in the step (1), uniformly mixing, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time and extrusion granulation for the third time in sequence to obtain the finished product.
Specifically, the conditions of the first extrusion granulation, the second extrusion granulation and the third extrusion granulation step must be independent: the temperature of the extruder is controlled to be 210-250 ℃, and the rotating speed of the screw is controlled to be 200-300rpm. Preferably, the process conditions of the three extrusion granulation remain the same.
Specifically, the mixing step in the step (1) is low-speed stirring and uniformly mixing, and the mixing step in the step (2) is high-speed stirring.
According to the high-gloss high-toughness polypropylene resin material, the impact-resistant copolymerized polypropylene is taken as the base resin, and is synergistically blended with the linear low-density polyethylene on the premise of adding the nucleating agent, the lubricant and the hexagonal boron nitride, so that the toughness and the glossiness of the polypropylene resin material are obviously improved, the rigidity and toughness balance effect of the resin material is achieved, and the shrinkage rate is obviously reduced. And the glossiness of the resin material is not reduced after multiple times of high-temperature granulation, and the resin can be directly recycled, so that the resin material has good comprehensive performance and has the advantage of green and environment-friendly.
According to the polypropylene resin material, the stiffening nucleating agent, the lubricant and the hexagonal boron nitride are added into the polypropylene and polyethylene blend, so that the crystallization of the polypropylene is thinned, the rubber phase in the impact-resistant polypropylene does not generate a large amount of rubber phase agglomeration phenomenon after the resin material is subjected to high-temperature mixing granulation for many times, and the compatibility of the polypropylene and the polyethylene is still better; in addition, as the hexagonal boron nitride is well attached to the screw rod, the glossiness of the sample does not decrease, the recycling of the composition is facilitated, and the pollution of plastics to the environment is reduced.
According to the preparation method of the high-gloss high-toughness polypropylene resin material, the impact copolymer polypropylene, the linear low-density polyethylene, the stiffening nucleating agent, the antioxidant, the hexagonal boron nitride and the lubricant are blended to play a synergistic effect, and the polypropylene composition with high gloss and high toughness is obtained by extruding and granulating three times through a double screw after being uniformly mixed by a high-speed stirrer.
Detailed Description
The following examples and comparative examples of the present invention relate to raw materials comprising:
Impact copolymer polypropylene resin: melt mass flow rate 10g/10min, melting temperature 155 ℃ and ethylene content 5.5%;
linear low density polyethylene: a density of 0.926g/cm 3, a melt mass flow rate of 20g/10min and a molecular weight distribution of 4.5;
And (3) a main antioxidant: an antioxidant 1010;
auxiliary antioxidant: an antioxidant 168;
stiffening nucleating agent: sorbitol derivative stiffening nucleating agent GRH-621;
hexagonal boron nitride: the purity of the powder is 99%, the grain diameter is 0.03-0.1 mu m, the crystal structure is sheet-shaped, and the aspect ratio is 13:1:
And (3) a lubricant: glycerol Monostearate (GMS).
Example 1
The polypropylene resin material of this embodiment is prepared from the following raw materials:
the preparation method of the high-gloss high-toughness polypropylene resin material comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, part of antioxidants A and B (0.05 weight part) and hexagonal boron nitride, and stirring at a low speed for 2min, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 220 ℃ and the screw rotating speed is 280 rpm);
(2) Mixing the rest antioxidant A and B (0.05 weight parts), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) and extrusion granulation for the third time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) in sequence to obtain the novel antioxidant.
Example 2
The polypropylene resin material of this embodiment is prepared from the following raw materials:
the preparation method of the high-gloss high-toughness polypropylene resin material comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, part of antioxidants A and B (0.05 weight part) and hexagonal boron nitride, and stirring at a low speed for 2min, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 220 ℃ and the screw rotating speed is 280 rpm);
(2) Mixing the rest antioxidant A and B (0.1 weight part), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) and extrusion granulation for the third time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) in sequence to obtain the novel antioxidant.
Example 3
The polypropylene resin material of this embodiment is prepared from the following raw materials:
the preparation method of the high-gloss high-toughness polypropylene resin material comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, part of antioxidants A and B (0.1 weight part) and hexagonal boron nitride, and stirring at a low speed for 2min, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 230 ℃ and the screw rotating speed is 260 rpm);
(2) Mixing the rest antioxidant A and B (0.1 weight part), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the extruder temperature is 230 ℃, the screw rotating speed is 260 rpm) and extrusion granulation for the third time (the extruder temperature is 230 ℃, the screw rotating speed is 260 rpm) in sequence to obtain the novel antioxidant.
Example 4
The polypropylene resin material of this example is different from example 2 in that the conditions for controlling the three extrusion granulation steps are: the extruder temperature was 210℃and the screw speed was 260rpm.
Example 5
The polypropylene resin material of this example is different from example 2 in that the conditions for controlling the three extrusion granulation steps are: the extruder temperature was 250℃and the screw speed was 230rpm.
Comparative example 1
The polypropylene resin material of the comparative example is prepared from the following raw materials:
The preparation method of the polypropylene resin material in the comparative example comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the stiffening nucleating agent, part of antioxidants A and B (0.05 weight part) and hexagonal boron nitride, stirring for 3min at a low speed, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 230 ℃ and the screw rotating speed is 300 rpm);
(2) Mixing the rest antioxidant A and B (0.05 weight parts), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) and extrusion granulation for the third time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) in sequence to obtain the novel antioxidant.
Comparative example 2
The polypropylene resin material of the comparative example is prepared from the following raw materials:
The preparation method of the polypropylene resin material in the comparative example comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, part of antioxidants A and B (0.1 weight part) and hexagonal boron nitride, and stirring at a low speed for 3min, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 220 ℃ and the screw rotating speed is 280 rpm);
(2) Mixing the rest antioxidant A and B (0.1 weight part), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) and extrusion granulation for the third time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) in sequence to obtain the novel antioxidant.
Comparative example 3
The polypropylene resin material of the comparative example is prepared from the following raw materials:
The preparation method of the polypropylene resin material in the comparative example comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, part of antioxidants A and B (0.05 weight part) and hexagonal boron nitride, and stirring at a low speed for 3min, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 230 ℃ and the screw rotating speed is 300 rpm);
(2) Mixing the rest antioxidant A and B (0.1 weight part), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the extruder temperature is 230 ℃, the screw rotating speed is 300 rpm) and extrusion granulation for the third time (the extruder temperature is 230 ℃, the screw rotating speed is 300 rpm) in sequence.
Comparative example 4
The polypropylene resin material of the comparative example is prepared from the following raw materials:
The preparation method of the polypropylene resin material in the comparative example comprises the following steps: mixing selected amounts of the impact copolymer polypropylene, the linear low density polyethylene, the antioxidants A and B, the nucleating agent and the lubricant, and stirring at a low speed for 3min to mix uniformly; and adding the uniformly mixed materials into a double-screw extruder for mixing, and sequentially carrying out three extrusion granulation, wherein in each extrusion granulation step, the temperature of the extruder is controlled to be 230 ℃, and the rotating speed of the screw is controlled to be 300rpm.
Comparative example 5
The polypropylene resin material of the comparative example is prepared from the following raw materials:
the preparation method of the high-gloss high-toughness polypropylene resin material comprises the following steps:
(1) Mixing the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, part of antioxidants A and B (0.05 weight part) and hexagonal boron nitride, and stirring at a low speed for 2min, and uniformly mixing; adding the uniformly mixed materials into a double-screw extruder for mixing, and performing first extrusion granulation (the temperature of the extruder is 220 ℃ and the screw rotating speed is 280 rpm);
(2) Mixing the rest antioxidant A and B (0.1 weight part), lubricant and the granules after the first extrusion, stirring at high speed for 1min, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) and extrusion granulation for the third time (the temperature of the extruder is 220 ℃, the screw rotating speed is 280 rpm) in sequence to obtain the novel antioxidant.
Experimental example
The properties of the polypropylene resin materials prepared in examples 1 to 3 and comparative examples 1 to 5 were tested, respectively, and the test method involved includes:
melt mass flow rate: testing according to GB/T3682-2000, and weighing 2.16kg at 230 ℃;
Notched impact strength of simply supported beams: tested according to GB/T1043.1-2008;
Bending properties: tested according to GB/T9341-2008;
Oxidation induction time: the test was carried out according to GB/T8807-1988.
The test results are shown in tables 1-2 below, respectively.
TABLE 1 characterization of Property of Polypropylene resin materials of examples 1-3 results
TABLE 2 characterization of the Property of Polypropylene resin materials of comparative examples 1-5
Therefore, the polypropylene resin material disclosed by the invention can be blended with the linear low-density polyethylene on the premise of adding the nucleating agent and the lubricant, so that the glossiness and toughness of polypropylene can be improved at the same time, the glossiness is not reduced after multiple high-temperature granulation, the resin can be directly recycled, the comprehensive performance of the polypropylene resin material is improved, and the polypropylene resin material has the advantage of green and environment-friendly.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The high-gloss high-toughness polypropylene composition is characterized by comprising the following components in parts by weight:
2. The high gloss high toughness polypropylene composition according to claim 1, wherein the impact copolymer polypropylene has a melt Mass Flow Rate (MFR) of 8-15g/10min, a melt temperature in the range of 160-168 ℃, and a mass content of ethylene of 4-6%.
3. The high gloss high toughness polypropylene composition according to claim 1 or 2, wherein the linear low density polyethylene has a density of 0.922-0.926g/cm 3, a melt mass flow rate of 16-22g/10min and a molecular weight distribution of 4.2-4.8.
4. The high gloss high toughness polypropylene composition according to claim 1 or 2, wherein the antioxidant comprises a primary antioxidant and a secondary antioxidant;
The main antioxidant comprises [3- (3, 5-di-tert-butyl-4-hydroxycyclohexyl) propionate ], [1,3,5, -tris (3, 5-di-tert-butyl, 4-hydroxybenzyl) s-triazine, 2,4,6- (1H, 3H, 5H) trione ], [3,3,3,5,5,5-hexa-tert-butyl-a, a, a- (1, 3, 5-trimethylbenzene-2, 4, 6-triyl) tri-p-cresol ];
The auxiliary antioxidants comprise [ tri (2, 4-di-tert-butylphenyl) phosphite ], [ bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite ], [ bis (2, 6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite ].
5. The high gloss, high toughness polypropylene composition according to claim 1 or 2, wherein the stiffening nucleating agent comprises sorbitol derivatives, organic phosphates, rosin or polymeric nucleating agents.
6. The high gloss high toughness polypropylene composition according to claim 1 or 2, wherein said hexagonal boron nitride has a particle size of 0.03 to 0.1 μm.
7. The high gloss high toughness polypropylene composition according to claim 1 or 2, wherein the lubricant comprises Glycerol Monostearate (GMS).
8. A high gloss high toughness polypropylene resin material prepared from the polypropylene composition of any one of claims 1 to 7.
9. A method for preparing the high-gloss high-toughness polypropylene resin material according to claim 8, comprising the steps of:
(1) Taking a selected amount of the impact copolymer polypropylene, the linear low density polyethylene, the stiffening nucleating agent, a part of antioxidant and boron nitride, uniformly mixing, adding into a double-screw extruder for mixing, and performing first extrusion granulation;
(2) Adding a selected amount of the lubricant and the rest of the antioxidant into the granules obtained in the step (1), uniformly mixing, adding into a double-screw extruder again for mixing, and performing extrusion granulation for the second time and extrusion granulation for the third time in sequence to obtain the finished product.
10. The method for producing a high-gloss high-toughness polypropylene resin material according to claim 9, wherein the conditions of the first extrusion granulation, the second extrusion granulation, and the third extrusion granulation are independent of each other: the temperature of the extruder is controlled to be 210-250 ℃, and the rotating speed of the screw is controlled to be 200-300rpm.
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