High-melt-index impact-resistant automobile interior polypropylene composition and preparation method thereof

Abstract

The invention discloses a high-melt-index impact-resistant automobile interior polypropylene composition and a preparation method thereof. The polypropylene composition comprises the following components: impact-resistant co-polypropylene powder, an antioxidant, an auxiliary antioxidant, an acid acceptor, a nucleating agent, a deodorant, a lubricant and a light stabilizer, wherein the mass ratio of the impact-resistant co-polypropylene powder to the antioxidant to the auxiliary antioxidant to the acid acceptor to the nucleating agent to the deodorant to the lubricant to the light stabilizer is 100: (0.15-0.2): (0.15-0.2): (0.005-0.05): (0.1-0.19): (0.5-1.5): (0.2-0.5): (0.1-0.15). The polypropylene composition has the advantages of wide relative molecular mass distribution, high fluidity, high rigidity, high impact resistance, greenness and the like. The polypropylene composition provided by the invention has good processability and impact resistance, and can be used in the field of automotive interiors, especially automotive upholstery.

Description

Technical Field

[0001] The invention belongs to the field of synthetic resins and relates to a high melt index impact-resistant automobile interior polypropylene composition and a preparation method thereof. Background Art

[0002] Polypropylene is a thermoplastic resin made by polymerizing propylene. Its disadvantages are poor low-temperature impact resistance and easy aging, but these can be overcome by modification. Copolymerization modification refers to the modification carried out in the polymerization stage with propylene monomer as the main component using a specific catalyst system. Copolymerization of propylene monomer with other olefin monomers can improve the low-temperature toughness, impact resistance, transparency and processing fluidity of polypropylene. Impact-resistant copolymerized polypropylene is widely used in automobiles, household appliances and other fields. Among them, due to its excellent impact resistance, impact-resistant copolymerized polypropylene is widely used in automobiles, household appliances and daily necessities.

[0003] High impact propylene is one of the important signs of high performance of polypropylene. It can significantly reduce the amount of elastomer added in automotive modified materials. The obvious price advantage can also be considered from the single and recyclable trend of polypropylene materials. In-situ preparation of high impact propylene from the reactor is the best choice. Compared with the high impact propylene products obtained after processing and modification, it has excellent comprehensive performance and high cost performance.

[0004] Based on the above properties of copolymerized polypropylene, we know that the ethylene content of ethylene-propylene copolymer has opposite effects on the flexural modulus and impact resistance of the copolymer. Increasing the copolymerization amount of ethylene can improve the impact resistance of the copolymer, but the flexural modulus is significantly reduced. When high modulus is required, the copolymerization amount of ethylene needs to be reduced, and its impact resistance is also reduced. In our actual needs, polymers with both modulus and impact resistance reaching a certain level are often required, such as when preparing some large thin-walled products, such as large parts in the automotive field. Configuring a high melt index, high modulus, and high impact polypropylene with excellent mechanical properties is the desire of industry technicians.

[0005] At present, the main means to improve the stiffness of impact-resistant polypropylene in my country is to mix a certain amount of glass fiber or add a large amount of inorganic components such as calcium carbonate, which leads to a significant decrease in the material's impact resistance, increased density, decreased processing performance, color changes, etc. Due to the high technical indicators, the production difficulty is relatively large. Although some domestic companies have done corresponding work, the product quality is still not ideal.

[0006] Chinese patent CN109111643A discloses a high-flow high-impact polypropylene material, wherein the melt flow rate of the high-flow high-impact polypropylene material is ≥25g / 10min, the ethylene content is 7-13%, the rubber content is 18-25%, and the simply supported beam notched impact strength is greater than 8kJ / m 2, and the flexural modulus is greater than 1050MPa. However, the polypropylene material cannot well balance fluidity and impact resistance, and the melt index is only 30-40g / 10min.

[0007] Chinese patent CN114806024A discloses a high impact and low temperature resistant polypropylene material and its preparation method. The high impact and low temperature resistant polypropylene material is based on the method of in-situ generation of β nucleating agent. During the PP extrusion process, dicarboxylic acid metal salt β nucleating agent is generated in-situ, so that the impact copolymer polypropylene (IPC) has a higher nucleating effect and significantly improves the impact strength of IPC. However, this series of products cannot take into account both fluidity and impact resistance. While improving the impact performance of the product, the flexural modulus is not greater than 900MPa.

[0008] Chinese patent CN102532380A discloses a method for producing high-fluidity impact-resistant polypropylene directly in a polymerization reactor, wherein a two-step polymerization reaction is carried out in the presence of a Ziegler-Natta catalyst, wherein the catalyst for the first step of propylene homopolymerization uses an external electron donor with good hydrogen sensitivity adjustment performance, and the second step of propylene and α-olefin copolymerization reaction adds an external electron donor with weaker hydrogen sensitivity adjustment performance than the first step. However, this series of products cannot take into account both fluidity and impact resistance well, and improving product fluidity causes a significant decrease in impact performance. When the melt index is greater than 50g / 10min, the bending modulus is only 0.8Gpa, which cannot take into account both fluidity and impact resistance well, and the melt index is only 30-40g / 10min.

[0009] Chinese patent CN110746703A discloses a high-rigidity and high-toughness polypropylene composition, characterized in that the composition has a melt flow rate greater than 35g / 10min, an ethylene mass content greater than 7%, a rubber mass content greater than 15%, a simply supported beam notched impact strength greater than 7kJ / m2 at room temperature, and a flexural modulus greater than 1500Mpa, and is mainly composed of impact-resistant copolymerized polypropylene powder and additives, wherein the additives include antioxidants, auxiliary antioxidants, acid absorbers and nucleating agents. However, the amount of nucleating agent added in the polypropylene composition is 0.2 to 0.3 parts, and the amount of nucleating agent added is too high, which increases the cost and causes harm to the environment and human health.

[0010] Chinese patent CN112662114A discloses a low-odor, low-VOC, scratch-resistant polypropylene interior material for automobiles, characterized in that it comprises the following components by weight percentage: 63-66% polypropylene, 18-22% talcum powder, 8-12% toughening agent, 0.3-0.5% antioxidant, 0.3-0.5% lubricant, 0.1-0.3% light stabilizer, 1-3% deodorant, and 1-3% scratch-resistant agent. However, the amount of additives added to the polypropylene interior material is generally high.

[0011] At present, the research on the influence of nucleating agent molecular structure on nucleating agent performance is in the preliminary stage. The molecular structure of nucleating agent will affect the nucleation effect, which is mainly reflected in: ① The molecular structure will affect the crystal structure of the nucleating agent, and then affect the lattice matching of epitaxial crystallization. ② The molecular structure affects the self-assembly of the nucleating agent by affecting the chemical bonds within and between molecules, and then affects the melting, dissolution, dispersion and crystallization behavior of the nucleating agent in polypropylene, and the nucleating agent crystals with different morphologies will also lead to changes in nucleation performance.

[0012] In the actual processing, the nucleating agent is generally added to the polypropylene matrix by melt blending. The nucleating agent will partially or even completely dissolve in the melt. In the subsequent cooling process, the nucleating agent will recrystallize in the melt. The crystallization state and dispersion degree of the nucleating agent will affect the surface area of ​​the epitaxial crystals, and then affect the nucleation effect of the nucleating agent. The crystallization state and dispersion degree of the nucleating agent are related to factors such as the amount of nucleating agent added, the melt processing temperature, and the melt cooling rate.

[0013] The process of isothermal crystallization of polypropylene was observed in situ using a polarizing microscope. It was found that the nucleating agent provides a large number of crystal nuclei for the crystallization of polypropylene, and crystallization can be achieved without a certain degree of supercooling. The spherulites are evenly distributed, small in size and uniform in size. It is generally believed that polypropylene without the addition of nucleating agents is a primary nucleation process, which requires a large degree of supercooling, a low crystallization temperature, and a slow nucleation and crystallization process. Polypropylene with the addition of nucleating agents is a secondary nucleation process, which requires a small degree of supercooling, a high crystallization temperature, and a rapid increase in the nucleation and crystallization rate. Foreign substances can become the crystal nuclei of polymer crystallization. Their special surface morphology can serve as heterogeneous crystal nuclei of polypropylene melts, allowing polypropylene molecular chains to entangle and grow on their surface, that is, heterogeneous nucleation. Research on the nucleation mechanism of phosphate-based polypropylene nucleating agents mainly focuses on epitaxial crystallization. Summary of the invention

[0014] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the object of the present invention is to provide a polypropylene material with low nucleating agent addition, high melt flow rate, and high impact resistance and a preparation method thereof, so as to obtain a polypropylene material with good fluidity, good rigidity, impact resistance, and being greener.

[0015] To achieve the above-mentioned purpose, the present invention provides a high melt index impact-resistant automotive interior polypropylene composition, which comprises the following components and weight ratio: impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100: 0.15-0.2: 0.15-0.2: 0.005-0.05: 0.1-0.19: 0.5-1.5: 0.2-0.5: 0.1-0.15.

[0016] The high melt index impact-resistant automotive interior polypropylene composition of the present invention is preferably composed of the impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100: 0.15-0.2: 0.15-0.2: 0.005-0.03: 0.15-0.18: 0.5-0.8: 0.2-0.4: 0.1-0.15.

[0017] The high melt index impact-resistant automobile interior polypropylene composition of the present invention comprises an impact-resistant copolymerized polypropylene powder of ethylene and propylene copolymer, a melt flow rate (at 2.16 kg and 230° C.) of 55-65 g / 10 min, and is produced by a gas phase process using a ZN catalyst.

[0018] The high melt index impact-resistant automotive interior polypropylene composition of the present invention, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 2246, antioxidant 300, antioxidant 1098, antioxidant 264, styrenated phenol, antioxidant CA, and antioxidant 3114, preferably antioxidant 1010, and when two or more are selected, they can be mixed in any proportion.

[0019] The high melt index impact-resistant automotive interior polypropylene composition of the present invention, the auxiliary antioxidant is at least one of trinonylphenyl phosphite (TNP), triphenyl phosphite (TPP), diphenyl-octyl phosphite (ODP), tris (mixed, mono- or dinonylphenyl) phosphites, 2-tert-butyl-d-(3-tert-butyl-4-hydroxy-phenyl)-p-isopropylphenyl-p-dinonylphenyl phosphite, dioctadecyl pentaerythritol phosphate (antioxidant 618), 4,4′-isopropylbisphenol (C12-Cs) alkyl phosphites, tris (2,4-tert-butylphenyl) phosphite (antioxidant 168), 4,4′-isobutyl-di (3-methyl-6-tert-butyl-phenyl) tridecyl bisphosphite, preferably tris (2,4-tert-butylphenyl) phosphite (antioxidant 168), when two or more are selected, they can be mixed in any proportion.

[0020] In the high melt index impact-resistant automobile interior polypropylene composition of the present invention, the acid absorber is at least one of hydrotalcite DHT-4A, calcium stearate and zinc oxide. When two or more are selected, they can be mixed in any proportion. Preferably, they are hydrotalcite DHT-4A and calcium stearate.

[0021] The high melt index impact-resistant automobile interior polypropylene composition of the present invention, the nucleating agent is at least one of 2,2'-methylenebis(4,6-di-tert-butylphenyl)sodium phosphate and N,N'-dicyclohexyl-2,6-naphthalene dicarboxamide. When two or more are selected, they can be mixed in any proportion, preferably 2,2'-methylenebis(4,6-di-tert-butylphenyl)sodium phosphate.

[0022] The high melt index impact-resistant automobile interior polypropylene composition of the present invention, the deodorant is LDV1040.

[0023] The high melt index impact-resistant automobile interior polypropylene composition of the present invention, the lubricant is at least one of calcium stearate, magnesium stearate and zinc stearate, and when two or more are selected, they can be mixed in any proportion, preferably calcium stearate.

[0024] The high melt index impact-resistant automotive interior polypropylene composition of the present invention, the light stabilizer is at least one of 4,4'-isopropylidene bis (phenol salicylate), salicylic acid p-tert-butylphenyl ester, salicylic acid p-tert-octylphenyl ester, salicylic acid p-tert-butylphenyl ester, when two or more are selected, they can be mixed in any proportion, preferably p-tert-butylphenyl salicylate.

[0025] The present invention also provides a method for preparing a high melt index impact-resistant automotive interior polypropylene composition, which comprises: mixing impact-resistant copolymer polypropylene powder, antioxidant, auxiliary antioxidant, acid absorber, nucleating agent, deodorant, lubricant and light stabilizer in proportion.

[0026] The method for preparing the high melt index impact-resistant automobile interior polypropylene composition of the present invention comprises the following mixing operation conditions: continuously mixing for 15-20 minutes using a high-speed mixer, and then melt-extruding in a twin-screw extruder at an extrusion temperature of 190-230°C.

[0027] The high melt index impact-resistant automobile interior polypropylene composition of the present invention uses at least one of 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate and N,N'-dicyclohexyl-2,6-naphthalene dicarboxamide as the nucleating agent. 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate can induce epitaxial crystallization of molecular chain segments of polypropylene in the polypropylene melt, reduce the nucleation free energy barrier, and grow along the surface perpendicular to the edge of the 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate crystal rather than the top, thereby increasing the crystallization rate. Its crystallographic data reveals that the lattice matching relationship between polypropylene and the nucleating agent is its fundamental nucleation mechanism. When investigating the nucleation mechanism of N, N'-dicyclohexyl-2,6-naphthalene dicarboxamide, it was found that the attached crystal plane of polypropylene and the nucleating agent is the (001) plane. Due to the chair conformation of the specific orientation of the cyclohexyl group of the nucleating agent, when the nucleating agent molecule is an even-numbered layer, all the cyclohexyl groups on the (001) plane are in the 11 o'clock direction. When the nucleating agent molecule is an odd-numbered layer, the cyclohexyl groups on the (001) plane are all in the 1 o'clock direction. Due to the steric hindrance of the methyl group, the polypropylene molecular chain presents a natural chirality of left-handed or right-handed rotation. The polypropylene crystal contains only one type of molecular chain, left-handed or right-handed. The left-handed molecular chain is more likely to match the (001) plane of the even-numbered layer molecular nucleating agent, and the right-handed molecular chain is more likely to match the (001) plane of the odd-numbered layer molecular nucleating agent. Based on the above principle, the high melt index impact-resistant automotive interior polypropylene composition of the present invention reduces the amount of nucleating agent added.

[0028] The polypropylene composition of the present invention has the advantages of wide relative molecular weight distribution, high fluidity, high rigidity, high impact resistance, and greenness. The polypropylene composition of the present invention has good processing performance and impact resistance, and can be used in the field of automotive interiors, especially automotive interior parts. The present invention solves the rigidity-toughness balance problem and the molecular weight distribution control problem of high melt index and high impact resistance products. The obtained polypropylene composition product has a controlled molecular weight distribution and good rigidity-toughness balance. The change of polypropylene performance from high rigidity to flexibility is achieved through the change of chain structure and aggregate structure, and the processing performance is improved to a great extent. It can meet the application of polypropylene materials in the field of automotive interiors, continuously promote the diversified development of plastic parts, improve the plasticization rate of automotive parts, and accelerate the pace of the "plastic steel" era, which is of far-reaching significance. In addition, the polypropylene composition of the present invention reduces the amount of nucleating agent added, which is more environmentally friendly and greener. DETAILED DESCRIPTION

[0029] The following is a detailed description of the embodiments of the present invention: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and process are given, but the protection scope of the present invention is not limited to the following embodiments. The experimental methods in the following embodiments without specifying specific conditions are usually carried out under conventional conditions.

[0030] Evaluation and analysis methods:

[0031] 1. Melt flow rate index (MFR): test method (standard) GB / T 3862, unit is g / 10min.

[0032] 2. Relative molecular weight distribution (PD): measured by gel permeation chromatography using 1,2,4-trichlorobenzene as solvent.

[0033] 3. Flexural modulus: measured according to the method described in GB / T 9341.

[0034] 4. Tensile strength: measured according to the method described in GB / T 1040.

[0035] 5. Impact strength: measured according to the method described in GB / T 1043.

[0036] The impact-resistant copolymer polypropylene powder of the following examples or comparative examples is produced in a 5L reactor using ZN catalyst as the main catalyst, triethylaluminum and an external electron donor as the catalytic system. It should be noted that the present invention is not limited to the above polymerization system.

[0037] Embodiment 1:

[0038] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0039] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0040] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.15:0.15:0.025:0.19:0.5:0.2:0.15, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0041] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0042] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0043] Embodiment 2:

[0044] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0045] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0046] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.19:0.2:0.015:0.15:1:0.3:0.15, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0047] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0048] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0049] Embodiment 3:

[0050] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0051] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0052] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.19:0.15:0.05:0.1:1.5:0.2:0.1, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0053] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0054] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0055] Embodiment 4:

[0056] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0057] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0058] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.18:0.15:0.02:0.15:0.5:0.4:0.15, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0059] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0060] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0061] Embodiment 5:

[0062] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0063] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0064] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is uniformly mixed with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.16:0.19:0.03:0.16:0.8:0.4:0.13, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0065] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0066] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0067] Embodiment 6:

[0068] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0069] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0070] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.17:0.18:0.04:0.17:1.2:0.5:0.14, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0071] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0072] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0073] Embodiment 7:

[0074] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0075] (1) Impact copolymer polypropylene powder: melt flow rate greater than 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst.

[0076] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.15:0.17:0.03:0.13:0.6:0.3:0.1, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0077] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0078] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0079] Embodiment 8:

[0080] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0081] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0082] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.2:0.15:0.005:0.17:0.7:0.4:0.14, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0083] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0084] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0085] Embodiment 9:

[0086] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0087] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0088] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.17:0.16:0.03:0.14:0.8:0.4:0.15, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0089] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0090] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0091] Embodiment 10:

[0092] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this embodiment is as follows:

[0093] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0094] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100:0.18:0.15:0.02:0.19:0.5:0.2:0.12, wherein the antioxidant is pentaerythritol β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, the deodorant is LDV1040, the lubricant is calcium stearate, and the light stabilizer is p-tert-butylphenyl salicylate to obtain a mixture.

[0095] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0096] The properties of the high melt index impact resistant automotive interior polypropylene composition obtained in this example are shown in Table 1.

[0097] Comparative Example 1:

[0098] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this comparative example is as follows:

[0099] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0100] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is mixed evenly with auxiliary agents in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber = 100:0.15:0.15:0.025, wherein the antioxidant is β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate pentaerythritol ester (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), and the acid absorber is hydrotalcite DHT-4A, to obtain a mixture.

[0101] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0102] The properties of the polypropylene composition for automotive interior decoration obtained in this comparative example are shown in Table 1.

[0103] Comparative Example 2:

[0104] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of this comparative example is as follows:

[0105] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0106] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) is uniformly mixed with an auxiliary agent in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant = 100:0.15:0.15, wherein the antioxidant is β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate pentaerythritol ester (antioxidant 1010), and the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), to obtain a mixture.

[0107] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0108] The properties of the polypropylene composition for automotive interior decoration obtained in this comparative example are shown in Table 1.

[0109] Comparative Example 3:

[0110] The preparation process of the high melt index impact-resistant automotive interior polypropylene composition of the comparative example is as follows:

[0111] (1) Impact copolymer polypropylene powder: melt flow rate is 64.8 g / 10 min. The melt flow rate test method is tested at 2.16 kg and 230 ° C according to (standard) GB / T 3862. It is produced by gas phase process and ZN catalyst is used.

[0112] (2) The impact-resistant copolymer polypropylene powder obtained in step (1) and the auxiliary agents are mixed in a weight ratio (%) of impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent = 100:0.15:0.15:0.025:0.19, wherein the antioxidant is β-(3.5-di-tert-butyl-4-hydroxyphenyl) propionate pentaerythritol ester (antioxidant 1010), the auxiliary antioxidant is tris(2,4-di-tert-butylphenyl) phosphite (antioxidant 168), the acid absorber is hydrotalcite DHT-4A, and the nucleating agent is 2,2'-methylenebis(4,6-di-tert-butylphenyl) sodium phosphate, to obtain a mixture.

[0113] (3) Melt-extrude the mixture obtained in step (2) through a twin-screw extruder to obtain a high melt index impact-resistant automotive interior polypropylene composition.

[0114] The properties of the polypropylene composition for automotive interior decoration obtained in this comparative example are shown in Table 1.

[0115] Table 1 Performance indexes of polypropylene obtained from Examples 1-10 and Comparative Examples 1-3

[0116]

[0117]

[0118] The results in Table 1 show that the relative molecular weight distribution of the polypropylene material obtained by the hydrogen adjustment production process in Examples 1-10 is 3.7-5.0, and the simply supported beam notched impact strength at room temperature is greater than 6 kJ / m 2 , the notched impact strength of simply supported beam at -20℃ is greater than 4kJ / m 2, and the bending modulus is greater than 1350 MPa, which meets the processing requirements of special materials for automobile interior decoration. In addition, compared with comparative examples 1-3, the polypropylene composition of the present invention has wide relative molecular weight distribution, high fluidity, high rigidity, and high impact resistance.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A high melt index impact resistant automotive interior polypropylene composition, characterized in that: The invention comprises the following components and weight ratio: impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100: 0.15-0.2: 0.15-0.2: 0.005-0.05: 0.1-0.19: 0.5-1.5: 0.2-0.5: 0.1-0.

15.

2. The high melt index impact-resistant automotive interior polypropylene composition according to claim 1, characterized in that: The impact-resistant copolymer polypropylene powder: antioxidant: auxiliary antioxidant: acid absorber: nucleating agent: deodorant: lubricant: light stabilizer = 100: 0.15-0.2: 0.15-0.2: 0.005-0.03: 0.15-0.18: 0.5-0.8: 0.2-0.4: 0.1-0.

15.

3. The high melt index impact-resistant automotive interior polypropylene composition according to claim 1, characterized in that: The impact-resistant copolymer polypropylene powder is a copolymer of ethylene and propylene, and has a melt flow rate (at 2.16 kg and 230° C.) of 55-65 g / 10 min.

4. The high melt index impact-resistant automotive interior polypropylene composition according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 2246, antioxidant 300, antioxidant 1098, antioxidant 264, styrenated phenol, antioxidant CA, and antioxidant 3114.

5. The high melt index impact-resistant automotive interior polypropylene composition according to claim 1, characterized in that: The auxiliary antioxidant is at least one of trinonylphenyl phosphite (TNP), triphenyl phosphite (TPP), diphenyl-octyl phosphite (ODP), tris (mixed, mono- or dinonylphenyl) phosphites, 2-tert-butyl-d-(3-tert-butyl-4-hydroxy-phenyl)-p-isopropylphenyl-p-dinonylphenyl phosphite, dioctadecyl pentaerythritol phosphate (antioxidant 618), 4,4′-isopropyl bisphenol (C12-Cs) alkyl phosphite, tris (2,4-tert-butylphenyl) phosphite (antioxidant 168), and 4,4′-partial butyl-di (3-methyl-6-tert-butyl-phenyl) tridecyl bisphosphite.

6. The high melt index impact resistant automotive interior polypropylene composition according to claim 1, characterized in that: The acid absorbent is at least one of hydrotalcite DHT-4A, calcium stearate and zinc oxide.

7. The high melt index impact resistant automotive interior polypropylene composition according to claim 1, characterized in that: The nucleating agent is at least one of 2,2'-methylenebis(4,6-di-tert-butylphenyl)sodium phosphate and N,N'-dicyclohexyl-2,6-naphthalene dicarboxamide.

8. The high melt index impact-resistant automotive interior polypropylene composition according to claim 1, characterized in that: The deodorant is LDV1040.

9. The high melt index impact-resistant automotive interior polypropylene composition according to claim 1, characterized in that: The lubricant is at least one of calcium stearate, magnesium stearate and zinc stearate.

10. The high melt index impact resistant automotive interior polypropylene composition according to claim 1, characterized in that: The light stabilizer is at least one of 4,4'-isopropylidene bis(phenol salicylate), p-tert-butylphenyl salicylate, p-tert-octylphenyl salicylate, and p-tert-butylphenyl salicylate.

11. A method for preparing the high melt index impact-resistant automotive interior polypropylene composition according to any one of claims 1 to 10, characterized in that: include: Mix the impact-resistant copolymer polypropylene powder, antioxidant, auxiliary antioxidant, acid absorbent, nucleating agent, deodorant, lubricant and light stabilizer in proportion; The mixing operation conditions are: continuous mixing for 15-20 minutes using a high-speed mixer, and then melt extrusion in a twin-screw extruder at an extrusion temperature of 190-230°C.

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