CN110760126A - Heat-resistant impact-resistant polypropylene composition and preparation method thereof - Google Patents
Heat-resistant impact-resistant polypropylene composition and preparation method thereof Download PDFInfo
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Abstract
A heat-resistant impact-resistant polypropylene composition and a preparation method thereof belong to the technical field of polypropylene materials. The adhesive is characterized by comprising the following components in parts by weight: 100 parts of polypropylene resin powder, 0.03-0.3 part of hyperbranched polymer powder, 0.02-0.1 part of inorganic nucleating agent, 0.05-0.3 part of antioxidant, 0.02-0.1 part of acid acceptor and 0.03-1.0 part of antistatic agent; the polypropylene resin is homopolymerized polypropylene resin powder, the melt mass flow rate of the homopolymerized polypropylene resin is 20-60 g/10min under the conditions of 2.16kg and 230 ℃, the isotacticity of the polypropylene is more than 95%, and the Mw/Mn is 4-12. The invention achieves the rigidity and toughness balance of the product by adding a small amount of hyperbranched polyethylene and a small amount of nano-scale white carbon black under the synergistic effect, improves the crystallization speed, improves the crystallization behavior of polypropylene, enables the crystal size of the resin to be more refined and compact, reduces the scattering and refraction of incident light, and increases the glossiness of the product.
Description
Technical Field
A heat-resistant impact-resistant polypropylene composition and a preparation method thereof belong to the technical field of polypropylene materials.
Background
Polypropylene (PP) is taken as one of five general-purpose plastics, has rich raw material sources and low price, has good comprehensive performance and wide application compared with other general-purpose plastics, and is popular with people. In 2016, the domestic PP demand is 2235 ten thousand tons, but in 16 years, the national PP yield is 1730 ten thousand tons, the market gap is nearly 500 ten thousand tons, and in the coming years, the domestic high-end PP market gap still depends on overseas import. However, the technology of the technology modification can realize high performance of PP to meet the market demand. PP post-modification means are very rich and can be divided into chemical modification and physical modification. The chemical modification mainly refers to copolymerization, grafting, crosslinking and the like, and the aim of modification is achieved by changing the molecular structure of PP. Some chemical modifications need to be realized in petrochemical large-scale industrial devices by regulating and controlling a polymerization process and introducing toughening monomers, the implementation difficulty is high, and some used crosslinking agents and compatibility are toxic and smelly. The invention achieves the purpose of improving the material performance through physical modification modes such as blending, filling and the like.
Polypropylene with melt flow rate above 20g/10min is generally called high-flow polypropylene, and high-flow polypropylene has wide application in the field of injection molding. One of the main fields of application is injection-molded thin-walled articles. The injection molding industry is the second field of PP downstream demand structures in China, and is mainly applied to small household appliances, daily necessities (such as plastic cups, take-out lunch boxes and the like), toys, washing machines, automobiles and turnover boxes. These articles are required not only to have good heat resistance but also to have excellent dimensional stability and gloss in general. At present, the modified polypropylene material is still produced injection molding parts on the existing low-shrinkage mold suitable for engineering plastics in most cases, and if the molding shrinkage of the modified polypropylene material is large, the problem that the injection molding parts obtained by using the modified polypropylene material do not meet the assembly requirements occurs; if a large amount of inorganic substances such as talcum powder, glass fiber and the like are added, the toughness of the material is reduced, the density and color of the resin are greatly increased, the use of the product is adversely affected, and the processing difficulty is increased; if the performance of the polypropylene resin is improved by adding a large amount of the organic nucleating agent and the gloss agent, the cost is high, and the appearance color of the product is yellowish when the auxiliary agents are used, so that the glossiness is influenced.
In the high-transparency heat-resistant impact-resistant modified polypropylene composite material and the preparation method thereof in the prior art, the heat-resistant impact-resistant polypropylene composition is obtained by adding poly 4-methylpentene-1, LLDPE, a compatilizer and other additives, but the used compatilizer has toxicity and odor, and the used poly 4-methylpentene-1 has poor environment resistance and is easy to oxidize and explain. The prior art also discloses a preparation method for directly reproducing the high-fluidity impact-resistant polypropylene in a polymerization reactor, which belongs to the field of chemical modification and is completely different from the invention.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides the composite material with good heat resistance, impact resistance and dimensional stability.
The technical scheme adopted by the invention for solving the technical problems is as follows: the heat-resistant impact-resistant polypropylene composition and the preparation method thereof are characterized by comprising the following components in parts by weight: 100 parts of polypropylene resin powder, 0.03-0.3 part of hyperbranched polymer powder, 0.02-0.1 part of inorganic nucleating agent, 0.05-0.3 part of antioxidant, 0.02-0.1 part of acid acceptor and 0.03-1.0 part of antistatic agent;
the polypropylene resin is homopolymerized polypropylene resin powder, the melt mass flow rate of the homopolymerized polypropylene resin is 20-60 g/10min under the conditions of 2.16kg and 230 ℃, the isotacticity of the polypropylene is more than 95%, and the Mw/Mn is 4-12.
In terms of mechanical properties, the addition of inorganic substances can obviously improve the modulus (rigidity) of the material, but the addition of excessive inorganic substances can greatly reduce the impact property (toughness) of the material, thus affecting the glossiness of the product, and a great deal of inorganic dust causes environmental and personal pollution to be more and more emphasized. The method for making up the toughness of the modified polypropylene resin is to add an organic nucleating agent for improving the toughness of the material, but the cost of the modified polypropylene resin is greatly increased because the market price of the nucleating agent is far higher than that of the polypropylene resin. The invention achieves the rigidity and toughness balance of the product by adding a small amount of hyperbranched polymer powder (preferably hyperbranched polyethylene) and a small amount of inorganic nucleating agent (preferably nano-scale white carbon black) under the synergistic effect, improves the crystallization speed, improves the crystallization behavior of polypropylene, enables the crystal size of the resin to be more refined and compact, reduces the scattering and refraction of incident light, and increases the glossiness of the product; the addition of an antistatic agent (polyethylene glycol) further improves the surface gloss of the final article. The increase of the crystallization temperature can shorten the molding period of the product and improve the production efficiency.
Preferably, the components in parts by weight are as follows: 100 parts of polypropylene resin powder, 0.05-0.2 part of hyperbranched polymer powder, 0.04-0.07 part of inorganic nucleating agent, 0.08-0.2 part of antioxidant, 0.04-0.06 part of acid acceptor and 0.04-0.08 part of antistatic agent.
Preferably, the hyperbranched polymer powder is arm-shaped hyperbranched polyethylene; the arm-shaped hyperbranched polyethylene contains a polyethylene alkyl fatty chain with 30-80 carbon atoms, and the tail end of the fatty chain is of a hyperbranched structure; the tail end of the arm-shaped hyperbranched polyethylene contains 8-15 polar groups, wherein the polar groups are amino groups, ester groups and amide groups; the number average molecular weight of the arm-shaped hyperbranched polyethylene is 1500-6000. The mechanical property of the hyperbranched polyethylene is poor, and the mechanical property of the system can be damaged when more hyperbranched polyethylene is added. The arm-shaped hyperbranched polyethylene may be a type 2120 polyethylene of weghai chenderived chemical limited.
The inorganic nucleating agent is calcium carbonate, silicon dioxide, barium sulfate, titanium oxide, aluminum oxide, zinc oxide, kaolin, white carbon black, diatomite, mica and the like, preferably, the inorganic nucleating agent is nano white carbon black with the particle size of 1 nm-100 nm, the purity of more than 99 percent and the BET specific surface area of 50m2/g ~ 500m2(ii) in terms of/g. The nano white carbon black is used as an inorganic nucleating agent, so that the crystallization temperature of a polypropylene material can be increased, the number of spherulites can be increased, and the size of the spherulites can be reduced. The composite also can be used as an odor inhibitor in the composite, effectively adsorbs the odor of each component and generated in processing and use, and the color of the white carbon black is similar to that of polypropylene, so that the color of the composite can be kept better.
Preferably, the inorganic nucleating agent: the mass ratio of the hyperbranched polymer powder is 1: 1-5. The invention reduces the dosage of the inorganic nucleating agent as much as possible, when the inorganic nucleating agent: when the ratio of the hyperbranched polyethylene to the polyethylene is 1:1-5, the two synergistically act to improve the crystallization behavior of the polypropylene, so that the polypropylene product has excellent performance.
Preferably, the antioxidant is a compound antioxidant of a phenol antioxidant and a phosphate antioxidant, wherein the phenol antioxidant is a main antioxidant, and the phosphate antioxidant is an auxiliary antioxidant, wherein the phenol antioxidant is one of pentaerythrityl tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010), [1, 3, 5-tris (3, 5-di-tert-butyl, 4-hydroxybenzyl) -1,3, 5-triazine-2, 4, 6- (1H, 3H, 5H) trione ] (3114) or [1, 3, 5-trimethyl-2, 4, 6- (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene ] (1330), and the phosphate antioxidant is one of [ tris (2, 4-di-tert-butylphenyl) phosphite ] (168), [ bis (2, 4-di-tert-butylphenol) pentaerythritol diphosphite ] (626) or [ bis (2, 6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite ] (PEP 36).
More preferably, the phenolic antioxidant is pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], and the phosphate antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite ].
The acid absorbent is commercially available stearate, including calcium stearate, zinc stearate, sodium stearate, etc. Preferably, the acid scavenger is calcium stearate. Abbreviated as Cast. The stearic acid metal salt is used as an acid absorbent to react with acid catalyst residues in the polypropylene resin to generate stearic acid salt and has lubricating effect.
Preferably, the antistatic agent is polyethylene glycol, the number average molecular weight of the polyethylene glycol is 3000-6000, and the melting point is 48-60 ℃. The antistatic agent is commercially available polyethylene glycol (PEG). The structure of PEG has good affinity with polymer molecules, no toxicity, no odor, no irritation, and easy dissolution in water, acetone, chloroform, etc. White waxy solid powder, the number average molecular weight of 3000-6000 and the melting point of 48-60 ℃. PEG replaces the traditional glycerol stearate antistatic agent, namely monoglyceride GMS for short, plays an antistatic role, and plays a good demoulding role in injection molding products. Meanwhile, PEG has the function of a dispersant in the composition, so that the basic resin and the hyperbranched polyethylene powder are well compatible.
The preparation method of the heat-resistant impact-resistant polypropylene composition is characterized by comprising the following steps: the method comprises the following steps:
1) mixing hyperbranched polymer powder, an inorganic nucleating agent and an antistatic agent, adding an n-hexane solvent, heating, refluxing and stirring for 30-45 minutes, evaporating to remove the n-hexane solvent, drying residual solid particles obtained after drying, stirring at intervals, and grinding to obtain powder;
2) adding an antioxidant, an acid-absorbing agent and the powder obtained in the step 1) into polypropylene resin powder, mixing in a high-speed mixer, wherein the rotating speed of a stirring paddle during mixing is 1000-2000 rpm, stirring for 3-5 minutes, then melting, blending and extruding the uniformly mixed materials through a co-rotating double-screw extruder, and granulating to obtain the polypropylene resin powder; the granulation temperature is 180-210 ℃.
The hyperbranched polyethylene, the inorganic nucleating agent and the antistatic agent are pretreated and then blended with the polypropylene powder, so that the dispersibility can be obviously improved, and the impact toughness, the heat resistance and the size stability of the raw materials can be obviously improved.
Compared with the prior art, the heat-resistant impact-resistant polypropylene composition and the preparation method thereof have the beneficial effects that: the invention achieves the rigidity and toughness balance of the product by adding a small amount of the hyper-branched polyethylene and the nano white carbon black under the synergistic effect, improves the crystallization speed, improves the crystallization behavior of the polypropylene, enables the crystal size of the resin to be more refined and compact, reduces the scattering and refraction of incident light, and increases the glossiness of the product; the addition of polyethylene glycol further improves the surface gloss of the final product. The increase of the crystallization temperature can shorten the molding period of the product and improve the production efficiency;
(1) the invention takes the high-flow polypropylene powder with low price as the base resin, thereby increasing the mixing effect with other components;
(2) the composition prepared by optimizing the auxiliary agent and pretreating the auxiliary agent has good heat resistance, impact resistance and dimensional stability;
(3) the advantage of low cost of PP is kept, the density of the prepared material is not improved, and the light weight of the product is ensured;
(4) the composition can be applied to large thin-wall products with complex structures and various small household appliance daily necessities, and can shorten the molding period of the products in injection molding production.
Detailed Description
The present invention is further illustrated by the following specific examples, of which example 1 is the most preferred.
Example 1
100 parts of homo-polypropylene powder (MFR (2.16kg, 230 ℃) of 40g/10min, polypropylene isotacticity of 96% and Mw/Mn of 5.6);
0.06 part of hyperbranched polyethylene (the number average molecular weight is 2000, the number average molecular weight is 40 carbon long fatty chains, and the tail end of the hyperbranched polyethylene contains 9 amide groups);
white carbon black (particle fineness 40nm, purity more than 99 percent, BET specific surface area of 320m2Per g) 0.055 parts;
0.06 part of polyethylene glycol (the number average molecular weight is 4500, the melting point is 56 ℃);
10100.07 parts of antioxidant, 1680.1 parts of antioxidant and 0.05 part of calcium stearate.
Example 2
100 parts of homo-polypropylene powder ((MFR (2.16kg, 230 ℃) of 30g/10min, polypropylene isotacticity of 96%, Mw/Mn of 5.0);
0.2 part of hyperbranched polyethylene (with the number average molecular weight of 3000, 40-carbon long fatty chain and 10 amino groups at the tail end);
white carbon black (particle fineness 30nm, purity more than 99 percent, BET specific surface area of 150m2Per gram) 0.04 parts;
0.06 part of polyethylene glycol (number average molecular weight 3000, melting point 50 ℃;
10100.04 parts of antioxidant, 1680.04 parts of antioxidant and 0.04 part of calcium stearate.
Example 3
100 parts of homo-polypropylene powder ((MFR (2.16kg, 230 ℃ C.) of 50g/10min, Mw/Mn of 6);
0.07 part of hyperbranched polyethylene (with the number average molecular weight of 2500, containing 30 carbon long fatty chains and 8 ester groups at the tail end);
white carbon black (particle fineness 50nm, purity more than 99 percent, BET specific surface area of 350 m2Per gram) 0.07 part;
0.04 part of polyethylene glycol (the number average molecular weight is 3500, the melting point is 54 ℃);
10100.1 parts of antioxidant, 1680.1 parts of antioxidant and 0.06 part of calcium stearate.
Example 4
100 parts of homo-polypropylene powder ((MFR (2.16kg, 230 ℃) of 60g/10min, polypropylene isotacticity of 95%, Mw/Mn of 4);
0.03 part of hyperbranched polyethylene (with the number average molecular weight of 6000, 35 carbon long fatty chains and 8 amino groups at the tail end);
white carbon black (particle fineness 1nm, purity more than 99 percent, BET specific surface area of 500m2Per gram) 0.1 part;
1.0 part of polyethylene glycol (the number average molecular weight is 6000, the melting point is 60 ℃;
10100.13 parts of antioxidant, 1680.13 parts of antioxidant and 0.04 part of zinc stearate.
Example 5
100 parts of homo-polypropylene powder ((MFR (2.16kg, 230 ℃) of 20g/10min, polypropylene isotacticity of 95%, Mw/Mn of 12);
0.3 part of hyperbranched polyethylene (with the number average molecular weight of 1500, containing 30 carbon long fatty chains and 15 amide groups at the tail end);
white carbon black (particle fineness 100nm, purity more than 99 percent, BET specific surface area of 50m2Per gram) 0.02 parts;
0.03 part of polyethylene glycol (number average molecular weight 3000, melting point 48 ℃);
10100.1 parts of antioxidant, 1680.1 parts of antioxidant and 0.04 part of sodium stearate.
Example 6
100 parts of homo-polypropylene powder ((MFR (2.16kg, 230 ℃) of 60g/10min, polypropylene isotacticity of 95%, Mw/Mn of 6.2);
0.20 part of hyperbranched polyethylene (the number average molecular weight is 3500, the number average molecular weight contains 30 carbon long aliphatic chains, and the tail end contains 10 amino groups);
white carbon black (particle fineness 70nm, purity more than 99 percent, BET specific surface area of 150m2Per g) 0.048 parts;
0.07 part of polyethylene glycol (number average molecular weight 3000, melting point 520 ℃;
31140.025 parts of antioxidant, 6260.025 parts of antioxidant and 0.04 part of sodium stearate.
The preparation of the polypropylene compositions in the examples is as follows:
(1) adding hyperbranched polyethylene, white carbon black and an antistatic agent into a round-bottom flask, pouring n-hexane, heating for refluxing, magnetically stirring for 30-45 minutes, removing the solvent by using a rotary evaporator, drying the residual solid particles in a vacuum drying oven at 50 ℃, stirring at intervals, and grinding for later use;
(2) and (2) adding an antioxidant, an acid-absorbing agent and the powder treated in the step (1) into the PP powder, mixing in a high-speed mixer at the rotating speed of 1000-2000 rpm for 3-5 minutes, then melting, blending and extruding the uniformly mixed material through a co-rotating double-screw extruder, and granulating to obtain the PP powder. The granulation temperature is 180-210 ℃, the length-diameter ratio of a screw of the extruder is 35, the rotating speed of the main machine is 150-230 r/min, and the feeding rotating speed is 30-50 r/min.
Comparative example 1
100 parts of homo-polypropylene powder ((MFR 40g/10min, Mw/Mn 5.6);
10100.1 parts of a binder;
1680.1 parts of a binder;
0.08 part of sodium stearate;
0.06 part of monoglyceride GMS.
Comparative example 2
100 parts of homo-polypropylene powder ((MFR 50g/10min, Mw/Mn 6);
1 part of white carbon black (with the particle fineness of 40 nm);
10100.1 parts of a binder;
1680.1 parts of a binder;
0.05 part of sodium stearate;
0.06 part of monoglyceride GMS.
Comparative example 3
100 parts of homo-polypropylene powder ((MFR 60g/10min, Mw/Mn 6.2);
210.3 parts of NA;
10100.1 parts of a binder;
1680.1 parts of a binder;
0.05 part of sodium stearate;
0.06 part of monoglyceride GMS.
Comparative example 4
100 parts of homo-polypropylene powder ((MFR 25g/10min, Mw/Mn 6.5);
1.0 part of hyperbranched polymer (molecular weight is 2000, 36-carbon long fatty chain is contained, and the tail end contains 8 amide groups);
10100.1 parts of a binder;
1680.1 parts of a binder;
0.07 part of sodium stearate;
0.06 part of monoglyceride GMS.
Comparative example 5
100 parts of homo-polypropylene powder ((MFR 40g/10min, Mw/Mn 5.6);
0.3 part of hyperbranched polyethylene (with the molecular weight of 2000, containing 40 carbon long fatty chains and 8 amide groups at the tail end);
0.055 part of white carbon black (with the particle fineness of 40 nm);
10100.1 parts of a binder;
1680.1 parts of a binder;
0.07 part of sodium stearate;
0.05 part of polyethylene glycol (molecular weight 4000).
The preparation method of comparative examples 1 to 5 is as follows:
(1) mixing materials: adding various auxiliary agents into the homopolymerized polypropylene powder, placing the homopolymerized polypropylene powder into a high-speed stirrer, stirring the homopolymerized polypropylene powder for 3 to 5min at the rotating speed of 1000 to 1500r/min, and uniformly mixing;
(2) and (3) granulation: and adding the uniformly mixed materials into a co-rotating double-screw extruder for melting and mixing, and extruding and granulating to obtain the composite material, wherein the highest section temperature of the extruder is 180-210 ℃, the rotating speed of a main machine of the extruder is 150-230 r/min, and the feeding rotating speed is 30-50 r/min.
The polypropylene compositions of examples and comparative examples were used to prepare test specimens using a K-TEC85 injection molding machine manufactured by MILACRON, Germany.
The test methods in the examples and comparative examples are as follows:
the tensile yield stress and the fracture nominal strain are carried out according to GB/T1040-;
the impact strength of the gap of the simply supported beam is tested according to GB/T1043-; the normal temperature treatment process is that the mixture is placed for 24 hours at 23 ℃;
the bending performance is tested according to GB/T9341-;
the load deformation temperature is tested according to GB/T1634.2-2004;
gloss was measured at 60 ℃ according to GB/T8807-1988;
crystallization temperature: according to ASTM D3418-2003; heating a sample of about 5 mg to 200 ℃ at a speed of 10 ℃/min under the protection of nitrogen, keeping the temperature for 5min, and cooling to 30 ℃ at a speed of 10 ℃/min to obtain the crystallization temperature of the sample;
the characterization and test method of shrinkage consistency comprises the following steps: under the condition of using a square die, dividing the shrinkage rate in the parallel direction by the shrinkage rate in the vertical direction, and when the ratio of the shrinkage rate in the parallel direction to the shrinkage rate in the vertical direction is 1, indicating that the material has isotropy, namely shrinkage consistency; when the ratio is far from 1, the non-uniform shrinkage in each direction is illustrated, and the problem of warpage exists particularly when large-size part products are injection molded. The hyperbranched polyethylene and the inorganic nucleating agent are used together to achieve the effect of reducing the shrinkage rate.
TABLE 1 basic Properties of the products of the examples
TABLE 2 basic Properties of the comparative example products
Comparative example 5 is the same as the preparation method of the example, the only difference being that no pretreatment of the hyperbranched polyethylene, the inorganic nucleating agent, the antistatic agent was performed. As can be seen from the comparison of the performance test results in tables 1-2, the materials of examples 1-6 have good impact toughness, heat resistance and strength, and the improvement of toughness makes the product isotropic and the dimensional stability of the product good. Comparative example 3 had poor toughness, although all other properties were good.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. The heat-resistant impact-resistant polypropylene composition is characterized by comprising the following components in parts by weight: 100 parts of polypropylene resin powder, 0.03-0.3 part of hyperbranched polymer powder, 0.02-0.1 part of inorganic nucleating agent, 0.05-0.3 part of antioxidant, 0.02-0.1 part of acid acceptor and 0.03-1.0 part of antistatic agent;
the polypropylene resin is homopolymerized polypropylene resin powder, the melt mass flow rate of the homopolymerized polypropylene resin is 20-60 g/10min under the conditions of 2.16kg and 230 ℃, the isotacticity of the polypropylene is more than 95%, and the Mw/Mn is 4-12.
2. The heat and impact resistant polypropylene composition according to claim 1, wherein: the components in parts by weight are as follows: 100 parts of polypropylene resin powder, 0.05-0.2 part of hyperbranched polymer powder, 0.04-0.07 part of inorganic nucleating agent, 0.08-0.2 part of antioxidant, 0.04-0.06 part of acid acceptor and 0.04-0.08 part of antistatic agent.
3. The heat and impact resistant polypropylene composition according to claim 1, wherein: the hyperbranched polymer powder is arm-shaped hyperbranched polyethylene; the arm-shaped hyperbranched polyethylene contains a polyethylene alkyl fatty chain with 30-80 carbon atoms, and the tail end of the fatty chain is of a hyperbranched structure; the tail end of the arm-shaped hyperbranched polyethylene contains 8-15 polar groups, wherein the polar groups are amino groups, ester groups and amide groups; the number average molecular weight of the arm-shaped hyperbranched polyethylene is 1500-6000.
4. The heat and impact resistant polypropylene composition according to claim 1, wherein: the inorganic nucleating agent is nano white carbon black with the particle size of 1 nm-100 nm, the purity of more than 99 percent and the BET specific surface area of 50m2/g ~ 500m2/g。
5. The heat and impact resistant polypropylene composition according to claim 1, wherein: the inorganic nucleating agent: the mass ratio of the hyperbranched polymer powder is 1: 1-5.
6. The heat and impact resistant polypropylene composition according to claim 1, wherein: the antioxidant is a compound antioxidant of a phenol antioxidant and a phosphate antioxidant.
7. The heat-resistant and impact-resistant polypropylene composition as claimed in claim 6, wherein the phenolic antioxidant is pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], and the phosphate antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite ].
8. The heat and impact resistant polypropylene composition according to claim 1, wherein: the acid absorbent is calcium stearate.
9. The heat and impact resistant polypropylene composition according to claim 1, wherein: the antistatic agent is polyethylene glycol, the number average molecular weight of the polyethylene glycol is 3000-6000, and the melting point is 48-60 ℃.
10. A method for preparing a heat and impact resistant polypropylene composition according to any one of claims 1 to 9, wherein the method comprises the following steps: the method comprises the following steps:
1) mixing hyperbranched polymer powder, an inorganic nucleating agent and an antistatic agent, adding an n-hexane solvent, heating, refluxing and stirring for 30-45 minutes, evaporating to remove the n-hexane solvent, drying residual solid particles obtained after drying, stirring at intervals, and grinding to obtain powder;
2) adding an antioxidant, an acid-absorbing agent and the powder obtained in the step 1) into polypropylene resin powder, mixing in a high-speed mixer, wherein the rotating speed of a stirring paddle during mixing is 1000-2000 rpm, stirring for 3-5 minutes, then melting, blending and extruding the uniformly mixed materials through a co-rotating double-screw extruder, and granulating to obtain the polypropylene resin powder; the granulation temperature is 180-210 ℃.
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