Polypropylene material as well as preparation method and application thereof

Abstract

The invention provides a polypropylene material as well as a preparation method and application thereof. The polypropylene material is prepared from the following raw materials: polypropylene, peroxide master batch, a beta nucleating agent, an elastomer, a powder filler and an auxiliary agent, wherein the added beta nucleating agent and elastomer can be combined for toughening, and the beta nucleating agent can induce polypropylene to form a finer and more uniform crystal structure, so that the rigidity of the product is further improved; the peroxide master batch is prepared from polypropylene and peroxide, the fluidity of the material can be improved when the peroxide master batch is added into a polypropylene compound system, the problem that the fluidity is reduced due to the fact that the content of the elastomer is increased is solved, and meanwhile the added powder filler can be better fused into the formula; through mutual cooperation of the raw materials in specific parts by mass, the PP modified material with high rigidity, high fluidity and high toughness can be prepared.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of polyolefin materials, and particularly relates to a high polypropylene material and a preparation method and application thereof. BACKGROUND

[0002] Polypropylene (PP) has become one of the most widely used general-purpose plastics in the automotive industry due to its low density, good chemical corrosion resistance, excellent processing performance and low cost. In the field of automotive exterior parts, especially in the bumper system, polypropylene composite materials occupy a dominant position due to their excellent comprehensive performance. The automobile bumper not only needs to meet the design requirements of lightweight to reduce fuel consumption and emissions, but also needs to have sufficient mechanical strength and impact resistance to protect the vehicle body parts in low-speed collisions, and has good surface quality to meet the aesthetic requirements.

[0003] However, general-purpose polypropylene resins have obvious defects when directly applied to automobile bumpers, mainly focusing on the following two aspects: insufficient impact strength, especially poor low-temperature toughness: although homopolymer polypropylene (PP-H) and part of copolymer polypropylene have certain toughness at room temperature, they are brittle at low temperature (such as below 0℃), and the impact resistance is significantly reduced. Although adding elastomers (such as POE, EPDM) for toughening modification is a common means in the industry, high content of elastomers often introduces new problems, such as significantly reducing the rigidity, heat resistance and flowability of the material.

[0004] Low melt flow rate (MFR) and poor processing flowability: modern automobile bumper design tends to be thin-walled, complex and integrated to further achieve lightweight and improve aesthetics. This puts higher requirements on the processing flowability of the material. Polypropylene composites with insufficient flowability require higher injection pressure and temperature when injection molding automobile parts, which not only increases energy consumption and equipment wear, but also easily leads to defects such as underfilling, obvious weld lines and rough surface, seriously affecting production efficiency and yield. Although increasing the processing temperature or selecting high-melt-point base materials can improve flowability, the former may cause thermal degradation of the material, and the latter usually sacrifices the molecular weight and mechanical properties (especially impact strength) at the cost, forming a contradiction between "flowability-toughness". Currently, the industry usually uses polypropylene copolymer as the matrix, and combines toughening agents, inorganic fillers (such as talc, calcium carbonate to improve rigidity and heat resistance) and other additives to prepare automobile part special materials. However, it is often difficult to simultaneously meet the performance indicators of high flowability, high impact strength and high rigidity, which are mutually restrictive. In order to achieve good low-temperature toughness, a large amount of toughening agent needs to be added, which will increase the melt viscosity and reduce the flowability; on the contrary, in order to improve the processing performance and reduce the amount of toughening agent, the flowability of the base material is improved, which will directly damage the toughness of the material.

[0005] Therefore, developing a new polypropylene composite material, which can cleverly balance the relationship between high fluidity and high impact strength (especially low temperature impact strength), significantly improve the processing formability without sacrificing key mechanical properties, has vital significance to meet the high performance and high efficiency production requirements of new generation of automobile parts, and is also the research focus and difficulty in the current polymer modification and automobile material field. SUMMARY

[0006] In order to overcome the problems existing in the prior art, one of the purposes of the present application is to provide a polypropylene material. The second purpose of the present application is to provide a preparation method of the polypropylene material. The third purpose of the present application is to provide an application of the polypropylene material.

[0007] In order to achieve the above purposes, the technical scheme adopted by the present application is: The first aspect of the present application provides a polypropylene material, comprising the following mass fractions of raw materials: 60-80 parts of polypropylene, 4-9 parts of peroxide masterbatch, 0.1-1 part of beta nucleating agent, 15-35 parts of elastomer, 5-15 parts of powder filler, and 0.4-4 parts of auxiliary agent; the peroxide masterbatch is prepared from polypropylene and peroxide.

[0008] Preferably, the polypropylene comprises block copolymerized polypropylene and homopolymerized polypropylene.

[0009] Preferably, the preparation method of the peroxide masterbatch comprises the following steps: mixing polypropylene and peroxide, and extruding and granulating to obtain the peroxide masterbatch.

[0010] The present application adopts a chemical degradation process to obtain a peroxide masterbatch of polypropylene with a wide molecular weight distribution, and combines a lubricant in the auxiliary agent to make the polypropylene material have high fluidity.

[0011] Preferably, the elastomer is selected from at least one of ethylene-propylene rubber, polyolefin elastomer, and ethylene-vinyl acetate copolymer.

[0012] Preferably, the powder filler comprises talc, calcium carbonate, wollastonite, and mica powder.

[0013] Preferably, the particle size of the powder filler is 3000-6000 mesh.

[0014] Preferably, the auxiliary agent comprises at least one of a coupling agent, a lubricant, a light stabilizer, and an antioxidant.

[0015] The second aspect of the present application provides a preparation method of the polypropylene material of the first aspect, comprising the following steps: Mixing each raw material component, melt blending, and cooling to obtain the polypropylene material.

[0016] Preferably, the temperature of the melt blending is 170 250℃.

[0017] The third aspect of the present application provides the use of the polypropylene material of the first aspect in the preparation of an automobile part.

[0018] Preferably, the automobile part is an automobile bumper.

[0019] The beneficial effects of the present application are: The present application provides a polypropylene material, the preparation raw materials including polypropylene, peroxide masterbatch, beta nucleating agent, elastomer, powder filler and auxiliary agent; wherein the beta nucleating agent and the elastomer can be combined to toughen, the beta nucleating agent can induce the polypropylene to form more detailed and uniform crystal structure, thereby further improving the rigidity of the product; and the peroxide masterbatch is prepared from polypropylene and peroxide, which is added to the polypropylene compound system to improve the fluidity of the material, not only solving the problem of reduced fluidity caused by the increase of the elastomer content, but also making the powder filler added better integrated into the formula; the block copolymer polypropylene-beta nucleating agent-elastomer-talc system is adopted, so that the low-temperature impact resistance is good; through the mutual cooperation of the above specific mass parts of raw materials, a PP modified material with high rigidity, high fluidity and high toughness can be prepared. DETAILED DESCRIPTION

[0020] The content of the present application is further described in detail through specific examples. In the following examples, the raw materials used, unless otherwise specified, can be obtained from conventional commercial channels or prepared and isolated by simple synthesis; the processes used, unless otherwise specified, all adopt the conventional processes in the art.

[0021] The first aspect of the embodiment of the present application provides a polypropylene material, including the following mass parts of preparation raw materials: 60-80 parts of polypropylene, 4-9 parts of peroxide masterbatch, 0.1-1 part of beta nucleating agent, 15-35 parts of elastomer, 5-15 parts of powder filler, 0.4-4 parts of auxiliary agent; the peroxide masterbatch is prepared from polypropylene and peroxide.

[0022] The polypropylene composite material according to the first aspect of the embodiment of the present application at least has the following beneficial effects: The application provides a polypropylene material, and preparation raw materials include polypropylene, peroxide masterbatch, beta nucleating agent, elastomer, powder filler and auxiliary agent; wherein beta nucleating agent and elastomer can be combined to perform toughening, the beta nucleating agent can induce polypropylene to form more detailed and uniform crystal structure, thereby further improving the rigidity of the product; and the peroxide masterbatch is prepared from polypropylene and peroxide, and the peroxide masterbatch can improve the fluidity of the material when added to the polypropylene compound system, thereby not only solving the problem of reduced fluidity caused by increased content of the elastomer, but also making the powder filler added better melt in the formula; through mutual cooperation of the above specific mass parts of raw materials, a PP modified material with high rigidity, high fluidity and high toughness can be prepared.

[0023] In some embodiments of the application, the polypropylene includes block copolymerized polypropylene and homopolymerized polypropylene.

[0024] In some embodiments of the application, the mass fraction of polypropylene in the preparation raw materials is 60-80 parts; in some specific embodiments of the application, the mass fraction of polypropylene in the preparation raw materials is 60-75 parts; in some examples of the application, the mass fraction of polypropylene in the preparation raw materials is 60-70 parts. In some specific examples of the application, the mass fraction of polypropylene in the preparation raw materials is 61 parts, 62 parts, 63 parts, 64 parts, 65 parts, 66 parts, 67 parts, 68 parts or 69 parts.

[0025] In some specific embodiments of the application, the mass fraction of block copolymerized polypropylene in the preparation raw materials is 50-60 parts, and the mass fraction of homopolymerized polypropylene is 7-13 parts.

[0026] In some examples of the application, the mass fraction of block copolymerized polypropylene in the preparation raw materials is 53-57 parts, and the mass fraction of homopolymerized polypropylene is 7-11 parts.

[0027] In some embodiments of the application, the preparation method of the peroxide masterbatch includes the following steps: mixing polypropylene and peroxide, and performing extrusion granulation to prepare the peroxide masterbatch.

[0028] In some specific embodiments of the application, the polypropylene is homopolymerized polypropylene.

[0029] In some specific embodiments of the application, the peroxide is selected from 2,5-dimethyl-2,5 di(tert-butyl peroxy) hexane (TX101) and / or 3,6,9-triethyl-3,6,9-trimethyl-1,4,7-triperoxonane (TX301).

[0030] In some specific embodiments of the application, the temperature of the mixing is 70-120 DEG C.

[0031] In some embodiments of the present application, the mixing method is selected from stirring.

[0032] In some embodiments of the present application, the stirring speed is 100-500 r / min; in some embodiments of the present application, the stirring speed is 200 r / min, 300 r / min or 400 r / min.

[0033] In some embodiments of the present application, the mixing time is 5-10 min.

[0034] In some embodiments of the present application, the mass ratio of the polypropylene to the peroxide is 100:(0.1-2); in some embodiments of the present application, the mass ratio of the polypropylene to the peroxide is 100:(0.1-0.7).

[0035] In some embodiments of the present application, the mass fraction of the peroxide masterbatch in the preparation raw material is 5-9 parts; in some embodiments of the present application, the mass fraction of the peroxide masterbatch in the preparation raw material is 6 parts, 7 parts or 8 parts.

[0036] In some embodiments of the present application, the β nucleating agent is a rare earth β nucleating agent.

[0037] The present application can induce the PP to form β-type crystal by using the β nucleating agent, thereby improving the impact resistance.

[0038] In some embodiments of the present application, the mass fraction of the β nucleating agent in the preparation raw material is 0.2-0.7 parts; in some embodiments of the present application, the mass fraction of the polyolefin elastomer in the preparation raw material is 0.3 parts, 0.4 parts, 0.5 parts or 0.6 parts.

[0039] In some embodiments of the present application, the elastomer is selected from at least one of ethylene propylene rubber (EPM), polyolefin elastomer (POE) and ethylene-vinyl acetate copolymer (EVA).

[0040] In some embodiments of the present application, the mass fraction of the elastomer in the preparation raw material is 20-35 parts; in some embodiments of the present application, the mass fraction of the elastomer in the preparation raw material is 20-30 parts; in some embodiments of the present application, the mass fraction of the polyolefin elastomer in the preparation raw material is 22 parts, 24 parts, 26 parts or 28 parts.

[0041] In some embodiments of the present application, the powder filler includes talc, calcium carbonate, wollastonite and mica powder.

[0042] In some embodiments of the present application, the particle size of the powder filler is 3000-6000 mesh.

[0043] The talc powder used in the present application is a fine talc powder, and the mesh number is required to be 3000-6000. As a material for automobile bumper, due to the relatively large size of the part, the material must have good toughness and rigidity. Due to the high content of elastomer in the material, the use of talc powder with high mesh number can achieve better dispersion, and at the same time, the toughness of the material is ensured and a certain rigidity is achieved.

[0044] In some embodiments of the present application, the mass fraction of talc powder in the preparation raw material is 7-13 parts; in some specific embodiments of the present application, the mass fraction of talc powder in the preparation raw material is 8 parts, 9 parts, 10 parts, 11 parts or 12 parts.

[0045] In some embodiments of the present application, the auxiliary agent includes at least one of a coupling agent, a lubricant, a light stabilizer and an antioxidant.

[0046] In some embodiments of the present application, the mass fraction of auxiliary agent in the preparation raw material is 0.5-2 parts; in some specific embodiments of the present application, the mass fraction of talc powder in the preparation raw material is 0.5-1.5 parts.

[0047] In some specific embodiments of the present application, the coupling agent is a titanate coupling agent.

[0048] The titanate coupling agent not only makes the talc powder uniformly dispersed in the polypropylene system, but also chemically reacts with the powder filler talc powder to form a coating layer on the surface, changes the surface properties of the talc powder, and is beneficial to improve the toughness of the talc powder filled polypropylene system. Since the content of elastomer (such as POE) in the material is large, the addition of coupling agent also has a certain anti-aging effect. Therefore, the optimal coupling agent in this system is a titanate coupling agent.

[0049] In some specific embodiments of the present application, the mass fraction of coupling agent in the preparation raw material is 0.1-0.4 parts.

[0050] In some specific embodiments of the present application, the lubricant includes at least one of zinc stearate, calcium stearate, barium stearate, stearic acid, oleic acid amide, paraffin or fatty acid.

[0051] In some specific embodiments of the present application, the mass fraction of lubricant in the preparation raw material is 0.1-0.4 parts.

[0052] The main function of the lubricant is to reduce the viscosity of the product, and in production, it can effectively reduce the defects of part tiger stripes and part gate stringing during demolding.

[0053] ​In some embodiments of the present application, the light stabilizer comprises one or a mixture of several of hindered amine light stabilizers, light screeners, ultraviolet absorbers, quenchers.

[0054] In some embodiments of the present application, the light stabilizer is in a mass fraction of 0.1-0.4 parts.

[0055] In some embodiments of the present application, the antioxidant is two or more of hindered phenol antioxidants, sulfur ester antioxidants, phosphite antioxidants, ester antioxidants.

[0056] In some embodiments of the present application, the antioxidant in the preparation raw material is in a mass fraction of 0.1-0.4 parts.

[0057] The second aspect of the embodiments of the present application provides a preparation method of the polypropylene material of the first aspect, comprising the following steps: mixing each preparation raw material, melt extruding, and granulating to obtain the polypropylene material.

[0058] In some embodiments of the present application, the mixing mode is selected from stirring.

[0059] In some embodiments of the present application, the stirring speed is 100-500 r / min; in some embodiments of the present application, the stirring speed is 200 r / min, 300 r / min, or 400 r / min.

[0060] In some embodiments of the present application, polypropylene and peroxide masterbatch are first mixed 1, then β nucleating agent and elastomer are added and mixed 2, and finally additives and powder fillers are added and mixed 3.

[0061] In some embodiments of the present application, the mixing mode of 1-3 is selected from stirring; the stirring speed of 1-3 is independently selected from 100-500 r / min; in some embodiments of the present application, the stirring speed of 1-3 is independently selected from 200 r / min, 300 r / min, or 400 r / min.

[0062] In some embodiments of the present application, the mixing time of 1-3 is independently selected from 5-10 min.

[0063] In some embodiments of the present application, the melt extrusion is carried out in a screw extruder; more specifically, in a twin-screw extruder.

[0064] In some embodiments of the present application, the temperature of the melt extrusion is 170 250°C; in some embodiments of the present application, the temperature of the melt extrusion is 200 230℃.

[0065] In some embodiments of the present application, the screw rotation speed of the melt extrusion is 300-800 r / min; in some specific embodiments of the present application, the screw rotation speed of the melt extrusion is 300-600 r / min.

[0066] The third aspect of the embodiments of the present application provides the use of the polypropylene material of the first aspect in the preparation of automobile parts.

[0067] The preparation method of the polypropylene material In the following examples and comparative examples, the specific steps of the preparation method of the polypropylene material are as follows: The copolymerized polypropylene and / or homopolymerized polypropylene and the peroxide masterbatch are proportionally put into a mixing machine, mixed at 200 r / min for 5-10 min; then the β nucleating agent and the elastomer are proportionally put in turn, mixed at 200 r / min for 5-10 min; finally, the talc and the coupling agent are proportionally put in turn, mixed at 200 r / min for 5-10 min. Extrusion molding and granulation are performed by a twin-screw extruder. The sectional temperature of the twin-screw extruder is 200℃, 210℃, 220℃, 220℃, 220℃, 220℃, 220℃, 220℃, 210℃ in turn, the die temperature is 220℃, the screw rotation speed is 300-600 r / min, and the polypropylene material is prepared.

[0068] The preparation method of the peroxide masterbatch In the following examples and comparative examples, the specific steps of the preparation method of the peroxide masterbatch are as follows: 100 parts of homopolymerized polypropylene and 0.4 parts of peroxide Tx101 are mixed at 70-120℃ and 200 r / min for 5-10 min, and then extrusion granulation is performed by a single-screw extruder to obtain the peroxide masterbatch.

[0069] Example 1 The present embodiment provides a polypropylene material. The preparation raw materials are specifically as follows in terms of mass fraction: 64 parts of copolymerized polypropylene (PPEP548R, CNOOC SHELL), 5 parts of peroxide masterbatch (self-made), 0.2 parts of β nucleating agent (HPN-20E, Milliken), 15 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 10 parts of talc (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico) and 0.2 parts of antioxidant (B225, Qiba).

[0070] The polypropylene material is prepared by using the above preparation method.

[0071] Example 2 The polypropylene material is prepared by using the above preparation method. 53 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 10 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 6 parts of peroxide masterbatch (self-made), 0.2 parts of β nucleating agent (HPN-20E, Milliken), 18 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 7 parts of talc (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.2 parts of antioxidant (B225, Qiba).

[0072] The polypropylene material is prepared by using the above preparation method.

[0073] Example 3 The polypropylene material is prepared by using the above preparation method. 50 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 13 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.2 parts of β nucleating agent (HPN-20E, Milliken), 20 parts of elastomer POE (POE8842, Dow Chemical), 4 parts of elastomer EVA (Elvax 460, DuPont), 7 parts of talc (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.2 parts of antioxidant (B225, Qiba).

[0074] The polypropylene material is prepared by using the above preparation method.

[0075] Example 4 The polypropylene material is prepared by using the above preparation method. 53 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 10 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 6 parts of peroxide masterbatch (self-made), 0.1 part of beta nucleating agent, 20 parts of elastomer POE (POE8842, Dow Chemical), 3 parts of elastomer EVA (Elvax 460, DuPont), 5 parts of talc (HTP05, Imerys), 0.2 part of coupling agent (titanate coupling agent, Yiyang Tianyang Chemical), 0.2 part of lubricant (AV300, Dongguan Hanwei), 0.2 part of light stabilizer (LA-402AF, Adico), and 0.2 part of antioxidant (B225, Qiba).

[0076] The polypropylene material is prepared by using the above preparation method.

[0077] Example 5 The polypropylene material is prepared by using the above preparation method. 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 part of beta nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talc (HTP05, Imerys), 0.2 part of coupling agent (titanate coupling agent, Yiyang Tianyang Chemical), 0.2 part of lubricant (AV300, Dongguan Hanwei), 0.2 part of light stabilizer (LA-402AF, Adico), and 0.15 part of antioxidant (B225, Qiba).

[0078] The polypropylene material is prepared by using the above preparation method.

[0079] Example 6 The polypropylene material is prepared by using the above preparation method. 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 part of beta nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talc (HTP05, Imerys), 0.2 part of coupling agent (titanate coupling agent, Yiyang Tianyang Chemical), 0.2 part of lubricant (AV300, Dongguan Hanwei), 0.2 part of light stabilizer (LA-402AF, Adico), and 0.15 part of antioxidant (B225, Qiba).

[0080] The polypropylene material is prepared by using the above preparation method.

[0081] Example 7 This example provides a polypropylene material, in terms of mass parts, the preparation raw material is as follows: 55 parts of copolymerized polypropylene, 9 parts of homopolymerized polypropylene, 5 parts of peroxide masterbatch (self-made), 0.5 parts of β nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talc powder (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical Industry), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Cabot).

[0082] The polypropylene material is prepared by using the above preparation method.

[0083] Example 8 This example provides a polypropylene material, in terms of mass parts, the preparation raw material is as follows: 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 7 parts of peroxide masterbatch (self-made), 0.5 parts of β nucleating agent (HPN-20E, Milliken), 22 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 10 parts of talc powder (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical Industry), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Cabot).

[0084] The polypropylene material is prepared by using the above preparation method.

[0085] Example 9 This example provides a polypropylene material, in terms of mass parts, the preparation raw material is as follows: 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of β nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 8 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talcum powder (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Qiba).

[0086] The polypropylene material is prepared by using the above preparation method.

[0087] Comparative Example 1 The comparative example provides a polypropylene material, and the preparation raw materials thereof are different from those of Example 5 in that the β nucleating agent is replaced by an α nucleating agent. Specifically, the preparation raw materials thereof are as follows in terms of mass fraction: 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of α nucleating agent, 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talcum powder (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Qiba).

[0088] The polypropylene material is prepared by using the above preparation method.

[0089] Comparative Example 2 The comparative example provides a polypropylene material, and the preparation raw materials thereof are different from those of Example 5 in that the polypropylene only uses homopolymerized polypropylene. Specifically, the preparation raw materials thereof are as follows in terms of mass fraction: 64 parts of homopolymerized polypropylene (PPEP548R, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of β nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talcum powder (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Qiba).

[0090] The polypropylene material is prepared by the above preparation method.

[0091] Comparative Example 3 This comparative example provides a polypropylene material, the raw materials for preparing which are different from those of Example 5 in that no elastomer is used, and the raw materials for preparing the polypropylene material are as follows in terms of mass fraction: 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of β nucleating agent (HPN-20E, Milliken), 30 parts of talc (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical Industry), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Cabot); The polypropylene material is prepared by the above preparation method.

[0092] Comparative Example 4 This comparative example provides a polypropylene material, the raw materials for preparing which are different from those of Example 5 in that only copolymerized polypropylene is used for the polypropylene, and the raw materials for preparing the polypropylene material are as follows in terms of mass fraction: 64 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of β nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talc (HTP05, Imi Fabi), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical Industry), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Cabot).

[0093] The polypropylene material is prepared by the above preparation method.

[0094] Comparative Example 5 This comparative example provides a polypropylene material, the raw materials for preparing which are different from those of Example 5 in that only copolymerized polypropylene is used for the polypropylene and no talc is used, and the raw materials for preparing the polypropylene material are as follows in terms of mass fraction: 72 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of beta nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Qiba). The polypropylene material is prepared by using the above preparation method.

[0095] Comparative Example 6 This comparative example provides a polypropylene material, the preparation raw materials of which are different from those of Example 5 in that 1000 mesh talc is used, and the preparation raw materials are specifically as follows in terms of mass fraction: 55 parts of copolymerized polypropylene (PPEP548R, CNOOC Shell), 9 parts of homopolymerized polypropylene (PPHZ30S, CNOOC Shell), 5 parts of peroxide masterbatch (self-made), 0.25 parts of beta nucleating agent (HPN-20E, Milliken), 17 parts of elastomer POE (POE8842, Dow Chemical), 5 parts of elastomer EVA (Elvax 460, DuPont), 8 parts of talc (HTP05, Imerys), 0.2 parts of coupling agent (titanate coupling agent, Yizheng Tianyang Chemical), 0.2 parts of lubricant (AV300, Dongguan Hanwei), 0.2 parts of light stabilizer (LA-402AF, Adico), and 0.15 parts of antioxidant (B225, Qiba).

[0096] The polypropylene material is prepared by using the above preparation method.

[0097] Performance test 1. Test method The test standard for fluidity is ASTM D1238; The test standard for -30℃ IZOD notched impact is ASTM D256; The test standard for -23℃ IZOD notched impact is ASTM D256; The shrinkage is tested according to GB 17037 standard, the linear expansion coefficient is tested according to ASTM D696 standard, and the surface tension is tested using a da Vinci pen.

[0098] 2. The test results are shown in Table 1: Table 1: Performance test results of Examples 1-9 and Comparative Examples 1-5

[0099] As shown in Table 1, the polypropylene materials of Examples 1-9 have good bending strength, impact strength and flowability, and can solve the contradiction between flowability and toughness, and the obtained polypropylene materials can simultaneously have high flowability, high impact strength and high rigidity, which are performance indexes that are restricted to each other, wherein the bending modulus of the polypropylene material of Example 8 reaches 1750 MPa, the impact performance at-30℃ reaches 85 J / m, and the flowability reaches 35 g / 10 min, and the polypropylene material can skillfully balance the relationship between high flowability and high impact strength (especially low-temperature impact strength), and significantly improve the processing formability without sacrificing key mechanical properties, which has vital significance for meeting the production requirements of high performance and high efficiency for new generation of automobile parts.

[0100] The polypropylene of Comparative Example 1 is prone to form α-type crystal, and the impact resistance will sharply decrease; the preparation raw materials of Comparative Examples 2-5 respectively lack polypropylene combination, elastomer and talc, and the rigidity or bending resistance of the obtained polypropylene decreases, and the processing conditions of automobile parts are not met; the different mesh numbers of talc used in Comparative Example 6 result in the rigidity of the obtained polypropylene material decreasing.

[0101] The above examples are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application shall be equivalent replacement methods, and all shall be included in the protection scope of the present application.

Claims

1. A polypropylene material, characterized in that, The preparation raw materials include the following mass fractions: 60-80 parts of polypropylene, 4-9 parts of peroxide masterbatch, 0.1-1 part of beta nucleating agent, 15-35 parts of elastomer, 5-15 parts of powder filler, and 0.4-4 parts of auxiliary agent; the preparation raw materials of the peroxide masterbatch include polypropylene and peroxide.

2. The polypropylene material according to claim 1, characterized in that, The polypropylene includes block copolymerized polypropylene and / or homopolymerized polypropylene.

3. The polypropylene material according to claim 1, characterized in that, The preparation method of the peroxide masterbatch includes the following steps: mixing polypropylene and peroxide, and performing extrusion granulation to prepare the peroxide masterbatch.

4. The polypropylene material according to claim 2, characterized in that, The mass ratio of the polypropylene to peroxide is 100:(0.1-2).

5. The polypropylene material according to claim 1, characterized in that, The elastomer includes at least one of ethylene-propylene rubber, polyolefin elastomer, and ethylene-vinyl acetate copolymer.

6. The polypropylene material according to claim 1, characterized in that, The powder filler includes at least one of talc, calcium carbonate, wollastonite, and mica powder. And / or, the particle size of the powder filler is 3000-6000 mesh.

7. The polypropylene material according to claim 1, characterized in that, The auxiliary agent includes at least one of coupling agent, lubricant, light stabilizer, and antioxidant.

8. Process for the production of a polypropylene material according to any one of claims 1-7, characterized in that, The method includes the following steps: The raw material components are mixed, melt-blended, and cooled to obtain the polypropylene material.

9. The method of producing a polypropylene material according to claim 8, characterized in that, The temperature of the melt-blending is 170-250℃.

10. Use of the polypropylene material according to any one of claims 1-7 in the preparation of automobile parts.

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