Low-temperature explosive polypropylene composite material, preparation method and application thereof

Abstract

The application discloses a low-temperature blasting polypropylene composite material. The low-temperature blasting polypropylene composite material comprises the following components in parts by weight: 55-80 parts of polypropylene, 5-20 parts of fillers, 1-5 parts of special fibers, 15-20 parts of toughening agents, 0.1-0.5 parts of mixed compatilizers and 0-1.2 parts of auxiliary agents; the polypropylene is binary block copolymer polypropylene synthesized by ethylene and propylene; the special fiber is an ultrahigh molecular weight polyethylene fiber with a fiber fineness of 400-800 deniers; and the mixed compatilizer comprises polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride. The specific binary block copolymer polypropylene, the ultrahigh molecular weight polyethylene fiber with the specific fiber fineness and the specific mixed compatilizer are matched, so that the polypropylene composite material has excellent low-temperature blasting performance, excellent tensile strength and excellent bending performance.

Description

Technical Field

[0001] This invention belongs to the technical field of polypropylene composite materials, and more specifically, relates to a low-temperature explosive polypropylene composite material, its preparation method, and its application. Background Technology

[0002] Polypropylene, with its low density, high cost-effectiveness, excellent heat resistance, rigidity, chemical corrosion resistance, ease of processing and recycling, is widely used in automobiles, becoming the most widely used and fastest-growing plastic in the automotive industry. In recent years, the rapid development of the automotive industry has placed increasingly higher demands on interior and exterior trim materials, such as the current industry-driven requirements for low-temperature burst-hardened dashboards, pillars, and other automotive interior components.

[0003] Currently, in the modified polypropylene industry, most low-temperature bursting formulations consist of talc, block copolymer polypropylene, toughening agent POE (ethylene-octene random copolymer, typically added at a concentration of 25% or higher), antioxidants, lubricants, and light stabilizers. Due to the high amount of toughening agent POE, existing low-temperature bursting polypropylene materials often have relatively low strength and modulus.

[0004] Therefore, how to provide a low-temperature bursting polypropylene composite material with excellent low-temperature bursting performance as well as excellent tensile and flexural properties has become an urgent technical problem to be solved. Summary of the Invention

[0005] In view of the above-mentioned existing technical problems, the primary objective of the present invention is to provide a low-temperature bursting polypropylene composite material, which has superior low-temperature bursting performance, and at the same time has excellent tensile and flexural properties.

[0006] The second objective of this invention is to provide a method for preparing a low-temperature explosive polypropylene composite material.

[0007] The third objective of this invention is to provide an application of a low-temperature bursting polypropylene composite material in the automotive industry.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0009] A high-efficiency low-temperature explosive polypropylene composite material, by weight, comprises the following components: 55-80 parts polypropylene, 5-20 parts filler, 1-5 parts special fiber, 15-20 parts toughening agent, 0.1-0.5 parts compatibilizer, and 0-1.2 parts additives; wherein the polypropylene is a binary block copolymer polypropylene synthesized from ethylene and propylene; the special fiber is ultra-high molecular weight polyethylene fiber with a fiber fineness of 400-800 denier; and the compatibilizer comprises polyethylene grafted with maleic anhydride and polypropylene grafted with maleic anhydride.

[0010] Ultra-high molecular weight polyethylene (UHMWPE) fibers provide better reinforcement and toughening than ordinary UHMWPE powder because the one-dimensional fiber reinforcement of UHMWPE fibers can better support the entire base resin than spherical powder. However, the inventors discovered that UHMWPE fibers have poor compatibility with polypropylene in polypropylene resin systems, which significantly affects the low-temperature burst performance, tensile properties, and flexural properties of polypropylene composites.

[0011] Through research, the inventors discovered that when the fineness of ultra-high molecular weight polyethylene (UHMWPE) fibers is between 400 and 800 denier, they exhibit good processability in polypropylene resin systems and can be dispersed well within the resin. However, when the fineness of UHMWPE fibers exceeds this range, the reinforcing and toughening effect on polypropylene composites is poor, and the low-temperature burst performance of the composites is significantly affected. Furthermore, the inventors found that when polyethylene-grafted maleic anhydride and polypropylene-grafted maleic anhydride are used as mixed compatibilizers in the polypropylene system, they not only exhibit good compatibility with UHMWPE fibers, but the two compatibilizers can also be further enhanced by being relinked together through maleic anhydride.

[0012] This invention uses binary block copolymer polypropylene synthesized from ethylene and propylene as the base material for polypropylene composite materials, and combines it with ultra-high molecular weight polyethylene fibers of a specific fiber fineness, a mixed compatibilizer of polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride. The resulting polypropylene composite material not only has superior low-temperature bursting performance, but also excellent tensile and flexural properties.

[0013] Preferably, the melt flow rate of the polypropylene at 230°C and 2.16 kg is 50–105 g / 10 min; more preferably, the melt flow rate of the polypropylene at 230°C and 2.16 kg is 60–100 g / 10 min. The melt flow rate (MFR) of the polypropylene is determined according to the standard method of melt mass flow rate test for plastic pellets - ISO 1133-1:2011.

[0014] Specifically, in the low-temperature bursting polypropylene composite material, the polypropylene content is not less than 58.6%.

[0015] The melt flow rate of polypropylene described in this invention can be 50 g / 10 min, 60 g / 10 min, 70 g / 10 min, 80 g / 10 min, 90 g / 10 min, 100 g / 10 min, etc., or any range formed by the above values, such as 60-80 g / 10 min, 80-100 g / 10 min, etc., but this invention is not limited thereto.

[0016] Preferably, the polypropylene has a dispersion index (PDI) of 6 to 10. PDI = Mw / Mn (weight-average molecular weight / number-average molecular weight), and is called the molecular weight dispersion index of the polymer. The weight-average molecular weight and number-average molecular weight of the polymer are tested using a high-temperature GPC method.

[0017] Preferably, the mass ratio of polyethylene grafted maleic anhydride to polypropylene grafted maleic anhydride is 1:3 to 3:1; or the mass ratio of polyethylene grafted maleic anhydride to polypropylene grafted maleic anhydride is 1:2 to 2:1. Within this preferred range, the polypropylene composite material exhibits superior high-efficiency low-temperature bursting performance, as well as excellent tensile strength and flexural properties.

[0018] Preferably, in the polyethylene grafted with maleic anhydride, the grafting rate of maleic anhydride is 0.5% to 1.6%. More preferably, in the polyethylene grafted with maleic anhydride, the grafting rate of maleic anhydride is 0.8% to 1.2%.

[0019] Preferably, in the polypropylene grafted with maleic anhydride, the grafting rate of maleic anhydride is 0.5% to 1.6%. More preferably, in the polypropylene grafted with maleic anhydride, the grafting rate of maleic anhydride is 0.8% to 1.2%.

[0020] Specifically, the polyethylene grafted with maleic anhydride and the polypropylene grafted with maleic anhydride described in this invention are commercially available or can be prepared in-house using methods known in the art. In-house preparation methods may include, for example, melt grafting, but are not limited to these methods.

[0021] Specifically, the grafting rate of maleic anhydride in the polyethylene grafted with maleic anhydride and the polypropylene grafted with maleic anhydride was determined by acid-base titration.

[0022] Preferably, the filler is one or more selected from basic magnesium sulfate whiskers, talc, and calcium carbonate; the D of the filler 50 The particle size is 0.5–12 μm.

[0023] Preferably, the D of the talc powder 50The particle size is 0.65–1 μm. Under this preferred particle size, the polypropylene composite material exhibits better tensile strength and flexural properties.

[0024] Preferably, the calcium carbonate has a D 50 The particle size is 4–8 μm. Under this optimal particle size, the polypropylene composite material exhibits better tensile strength and flexural properties.

[0025] Specifically, laser particle size analysis was used to test the D content of talc and calcium carbonate. 50 Particle size.

[0026] Preferably, the number-average molecular weight of the ultra-high molecular weight polyethylene fiber is 1 million to 3 million. The number-average molecular weight of the ultra-high molecular weight polyethylene fiber is tested using a high-temperature GPC method.

[0027] Preferably, the toughening agent is selected from one or two of ethylene-octene random copolymers and ethylene-octene block copolymers.

[0028] Preferably, the additives include one or more of lubricants, antioxidants, and light stabilizers.

[0029] More preferably, the lubricant includes, but is not limited to, amide lubricants, stearate lubricants, etc. The antioxidant includes, but is not limited to, hindered phenolic antioxidants, phosphite antioxidants, etc. The light stabilizer includes, but is not limited to, hindered amine light stabilizers and / or benzoate light stabilizers, such as 2,2,6,6-tetramethyl-4-piperidine stearate (light stabilizer 3853) and / or hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate (light stabilizer 2908), and this application is not limited thereto.

[0030] Furthermore, the present invention also claims protection for a method for preparing a low-temperature bursting polypropylene composite material, wherein polypropylene, special fibers, toughening agents, compatibilizers, and additives are mixed, fillers are added and mixed, and the mixture is melt-extruded to obtain the low-temperature bursting polypropylene composite material.

[0031] Preferably, the mixing speed is 200-300 rpm.

[0032] Preferably, a twin-screw extruder is used for extrusion, and the length-to-diameter ratio of the twin-screw extruder is 48 to 56:1.

[0033] Preferably, the melt extrusion adopts a triple vacuum process, and the vacuum degree is controlled to be ≤-0.08MPa.

[0034] Preferably, the temperature of the melt extrusion is 170–210°C. Further, the temperatures from the feeding section to the die head are 170°C, 200°C, 200°C, 210°C, 210°C, 205°C, 205°C, 205°C, 200°C, and 200°C respectively.

[0035] Furthermore, this invention also claims protection for the application of a low-temperature bursting polypropylene composite material in the automotive industry. Specifically, the low-temperature bursting polypropylene composite material can be used as interior automotive parts, including but not limited to low-temperature bursting rigid dashboards, pillars, and other automotive interior parts, especially in applications requiring high low-temperature bursting and mechanical properties.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This invention uses binary block copolymer polypropylene synthesized from ethylene and propylene as the base material for polypropylene composites, and combines it with ultra-high molecular weight polyethylene fibers of a specific fiber fineness, a mixed compatibilizer of polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride. The resulting polypropylene composite material not only has superior high-efficiency low-temperature bursting performance, but also excellent tensile and flexural properties. Detailed Implementation

[0038] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0039] Description of raw materials for examples and comparative examples:

[0040] Polypropylene 1, a block copolymer polypropylene synthesized from ethylene and propylene, model: BI871, MFR (230℃, 2.16kg) = 60g / 10min, PDI = 7.5, manufacturer: Hanwha Total.

[0041] Polypropylene 2, a block copolymer polypropylene synthesized from ethylene and propylene, model: 7905E1, MFR (230℃, 2.16kg) = 100g / 10min, PDI = 8.6, manufacturer: ExxonMobil.

[0042] Special Fiber 1: Ultra-high molecular weight polyethylene fiber, UHMWPE, fiber fineness 800 denier, number average molecular weight 2 million, manufacturer: Beijing Tongyi Zhongxin Material Technology Co., Ltd.

[0043] Special Fiber 2: Ultra-high molecular weight polyethylene fiber, UHMWPE, fiber fineness 700 denier, number average molecular weight 1.5 million, manufacturer: Beijing Tongyi Zhongxin Material Technology Co., Ltd.

[0044] Special Fiber 3: Ultra-high molecular weight polyethylene fiber, UHMWPE, fiber fineness 400 denier, number average molecular weight 1 million, manufacturer: Beijing Tongyi Zhongxin Material Technology Co., Ltd.

[0045] Special Fiber 4: Ultra-high molecular weight polyethylene fiber, UHMWPE, fiber fineness 1600 denier, number average molecular weight 3 million, manufacturer: Beijing Tongyi Zhongxin Material Technology Co., Ltd.

[0046] Ultra-high molecular weight polyethylene, UHMWPE, model: U010P, number average molecular weight 1 million, manufacturer: Daehan Oil & Chemical.

[0047] Toughening agent 1, ethylene-octene random copolymer (POE), model: Engage 8842, manufacturer: Dow Chemical.

[0048] Toughening agent 2, ethylene-octene block copolymer (OBC), model: Infuse 9107, manufacturer: Dow Chemical.

[0049] Mixed compatibilizer 1: The mass ratio of polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride is 1:1; wherein, the grafting rate of polyethylene grafted maleic anhydride 1 is 0.8% (detected by acid-base titration method).

[0050] Polypropylene grafted with maleic anhydride 1, grafting rate 1.2%, model: PP-g-MAH(B2), manufacturer: Cosmetic Chemicals Co., Ltd.

[0051] Preparation method of polyethylene grafted with maleic anhydride 1:

[0052] A- 70 parts of high-density polyethylene HMA026, 0.6 parts of maleic anhydride and 0.41 parts of di-tert-butyl peroxide were placed in a Hacker torque rheometer at 170°C for melt grafting; after the melt grafting reaction was completed in 25 minutes, a grafted mixture was obtained.

[0053] B- Take out the grafting mixture, compress it into tablets, crush it into granules, purify the grafting mixture, weigh 30g of granular grafting mixture, put the grafting mixture into a flask containing 850mL xylene solvent, heat at 95℃ for 3h to completely dissolve the grafting mixture, cool to room temperature, add 4000mL acetone, precipitate, filter, and dry to obtain polyethylene grafted maleic anhydride 1, which is kept for later use.

[0054] Mixed compatibilizer 2: The difference between mixed compatibilizer 2 and mixed compatibilizer 1 is that the mass ratio of polyethylene grafted maleic anhydride 1 and polypropylene grafted maleic anhydride 1 is 1:3.

[0055] Mixed compatibilizer 3: The difference between mixed compatibilizer 3 and mixed compatibilizer 1 is that the mass ratio of polyethylene grafted maleic anhydride 1 and polypropylene grafted maleic anhydride 1 is 3:1.

[0056] Mixed compatibilizer 4: The difference between mixed compatibilizer 4 and mixed compatibilizer 1 is that mixed compatibilizer 4 is made by grafting maleic anhydride 2 onto polyethylene, with a grafting rate of 0.5% (detected by acid-base titration).

[0057] Preparation method of polyethylene grafted maleic anhydride 2: The preparation method is the same as that of polyethylene grafted maleic anhydride 1, except that 0.375 parts of maleic anhydride and 0.26 parts of di-tert-butyl peroxide are used.

[0058] Mixed compatibilizer 5: The difference between mixed compatibilizer 5 and mixed compatibilizer 1 is that mixed compatibilizer 5 is made by grafting maleic anhydride 3 onto polyethylene, with a grafting rate of 1.6% (detected by acid-base titration).

[0059] Preparation method of polyethylene grafted maleic anhydride 3: The preparation method is the same as that of polyethylene grafted maleic anhydride 1, except that 1.2 parts of maleic anhydride and 0.82 parts of di-tert-butyl peroxide are used.

[0060] Mixed compatibilizer 6: The difference between mixed compatibilizer 6 and mixed compatibilizer 1 is that mixed compatibilizer 6 is made by grafting maleic anhydride 4 onto polyethylene, with a grafting rate of 1.2% (detected by acid-base titration).

[0061] Preparation method of polyethylene grafted maleic anhydride 4: The preparation method is the same as that of polyethylene grafted maleic anhydride 1, except that 0.9 parts of maleic anhydride and 0.62 parts of di-tert-butyl peroxide are used.

[0062] Metallocene ethylene-propylene copolymer, model Vistamaxx 6202, ethylene content 15%, manufacturer: ExxonMobil.

[0063] Talc 1, D 50 Particle size = 6μm, Model: TYT-777A, Manufacturer: Liaoning Tianyuan.

[0064] Talc 2,D 50 Particle size = 0.65μm, Model: HTPultra5L, Manufacturer: Imfabi.

[0065] Calcium carbonate 1, type: heavy calcium carbonate, D 50 Particle size = 6μm, Manufacturer: Guangxi Xingai Mining.

[0066] Calcium carbonate 2, type: heavy calcium carbonate, D 50 Particle size = 12μm, Manufacturer: Guangxi Xingai Mining.

[0067] Antioxidant 1, hindered phenolic antioxidant, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], commercially available.

[0068] Antioxidant 2, phosphite antioxidant, tris[2,4-di-tert-butylphenyl]phosphite, commercially available.

[0069] Light stabilizer, model: UV-3808PP5, commercially available.

[0070] Lubricant: Calcium stearate, commercially available.

[0071] Unless otherwise specified, all components (e.g., antioxidants, light stabilizers, lubricants, etc.) used in the parallel embodiments and comparative examples are the same commercially available products.

[0072] Example 1

[0073] The weight proportions of the raw materials used in Example 1 are shown in Table 1.

[0074] A method for preparing a low-temperature explosive polypropylene composite material, comprising the following steps:

[0075] Weigh out polypropylene, special fibers, toughening agent, compatibilizer, antioxidant, light stabilizer, and lubricant according to the weight proportions in Table 1, and mix them in a high-speed mixer (200-300 rpm) for 3-5 minutes. Then add filler (calcium carbonate or talc) and mix in a high-speed mixer (200-300 rpm) for 3-5 minutes. Then add the mixture to a twin-screw extruder (length-to-diameter ratio 52:1) for melt extrusion. The extrusion adopts a double vacuum process with a vacuum degree ≤-0.08MPa. The temperature of the twin-screw extruder from the feeding section to the die head is 170℃, 200℃, 200℃, 210℃, 210℃, 205℃, 205℃, 205℃, 200℃, 200℃. Granulate, dry, and cool to obtain the low-temperature bursting polypropylene composite material.

[0076] Examples 2-13

[0077] The weight proportions of the raw materials used in the following embodiments are shown in Table 1.

[0078] The specific preparation steps for the following embodiments are the same as those for Embodiment 1.

[0079] Comparative Examples 1-8

[0080] The weight proportions of raw materials used in each of the following comparative examples are shown in Table 2.

[0081] The specific preparation steps for each comparative example are the same as those in Example 1.

[0082] Table 1 shows the formulation components of each embodiment:

[0083] Table 1

[0084]

[0085]

[0086] Table 2 shows the formulation components for each comparative example:

[0087] Table 2

[0088] Components Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Polypropylene 1 68 65 68 65 65 65 65 65 Special fiber 1 0 3 0 0 0 3 3 3 Special fiber 4 0 0 0 0 3 0 0 0 Ultra-high molecular weight polyethylene 0 0 0 3 0 0 0 0 Toughening agent 1 16 16 16 16 16 16 16 16 Mixed compatibilizer 1 0.3 0 0 0.3 0.3 0 0 0 Polyethylene grafted with maleic anhydride 1 0 0 0 0 0 0.3 0 0 Polypropylene grafted with maleic anhydride 1 0 0 0 0 0 0 0.3 0 Metallocene ethylene-propylene copolymer 0 0 0 0 0 0 0 0.3 Talc 1 16 16 16 16 16 16 16 16 Antioxidant 1 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 Antioxidant 2 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 Light stabilizers 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 lubricant 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2

[0089] The raw materials and low-temperature bursting polypropylene composite materials used in the above embodiments and comparative examples were tested according to the following test methods:

[0090] 1. Tensile strength: Tested according to ISO 527-2:2019, with a tensile speed of 50 mm / min and 1A specimen.

[0091] 2. Bending performance: Tested according to ISO 178:2019, bending speed 2 mm / min.

[0092] 3. Cantilever beam notched impact: Tested according to ISO 180:2019, type A notch.

[0093] 4. Low-temperature -40℃ multiaxial impact: Tested according to ISO 6603-2:2000 standard (evaluation of 2mm thick square plate, impact velocity 4.4m / s; performance is graded from best to worst as YD, YS, YU, and NY). YD type fracture mode is characterized by a clear yield point in the curve, with uniform extension of the fracture surface and only one crack ring in the penetration hole. YS type fracture mode is characterized by a clear yield point in the curve, with stable but inconsistent ductility on the fracture surface, which can be uniformly distinguished, and two non-repeating crack rings in the penetration hole. YU type fracture mode is characterized by a clear yield point in the curve, with unstable ductile fracture on the fracture surface, possibly including ductile fracture sections, and two non-repeating crack rings in the penetration hole or unstable, non-ductile fracture at the penetration site.

[0094] The fracture is characterized by obvious cracks but no detachment from the template; the NY type fracture mode is characterized by no yielding. Generally, it is considered that the failure mode YD&YS can meet the blasting requirements, while YU&NY does not.

[0095] Tables 3 and 4 show the performance test results for each embodiment and comparative example, respectively.

[0096] Table 3

[0097]

[0098] Table 4

[0099]

[0100] As shown in the data from Examples 1-13, this invention utilizes specific binary block copolymer polypropylene, ultra-high molecular weight polyethylene fibers with specific fiber fineness, and a specific compatibilizer to ensure that the polypropylene composite material possesses excellent low-temperature bursting performance, as well as excellent tensile strength and flexural properties. The prepared low-temperature bursting polypropylene composite material exhibits a YD&YS multiaxial failure mode at -40℃, which meets the bursting requirements. In terms of mechanical properties, the polypropylene composite material has a tensile strength > 24 MPa and a flexural modulus > 0.5%.

[0101] >1458MPa, cantilever beam notched impact >11KJ / m 2 .

[0102] As can be seen from Examples 1, 2 and 3, and Examples 4 and 5, when the mass ratio of polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride in the mixed compatibilizer is 1:2 to 2:1, or when the grafting rate of polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride is 0.5 to 1.6%, the polypropylene composite material prepared has better tensile strength, flexural properties and cantilever beam notched impact strength.

[0103] As shown in Examples 1, 6, 7, and Comparative Example 5, the mechanical properties of polypropylene composites gradually improve as the fiber fineness of ultra-high molecular weight polyethylene (UHMWPE) fibers gradually decreases. However, when the fiber fineness of UHMWPE fibers exceeds 400–800 denier (e.g., 1600 denier), the dispersion and processability of the UHMWPE fibers in the polypropylene resin system are poor due to their larger fiber fineness, resulting in a significant decrease in the tensile strength, flexural strength, flexural modulus, and cantilever beam notched impact strength of the prepared composite material.

[0104] As can be seen from Examples 1, 1, 2 and 3, when ultra-high molecular weight polyethylene fiber and / or mixed compatibilizer are missing in the polypropylene system, the prepared polypropylene composite material cannot achieve the technical effect of the present invention. This indicates that the present invention requires the use of ultra-high molecular weight polyethylene fiber and mixed compatibilizer to ensure the low-temperature burst performance and mechanical properties of the polypropylene composite material.

[0105] As can be seen from Example 1 and Comparative Example 4, when non-fiber ultra-high molecular weight polyethylene is used in the polypropylene composite material system, not only are the tensile strength, flexural strength, flexural modulus and cantilever beam notched impact of the polypropylene composite material significantly reduced, but the low-temperature burst performance also fails to achieve the technical effect of the present invention.

[0106] As can be seen from Examples 1, 6, and 7, a single mixed compatibilizer is insufficient to achieve the compatibility and dispersion of the components in the polypropylene system of the present invention, and the prepared polypropylene composite material is difficult to achieve the technical effect of the present invention.

[0107] As can be seen from Example 1 and Comparative Example 8, it is difficult to achieve the technical effect by using metallocene ethylene-propylene copolymer with the ultra-high molecular weight polyethylene fiber of the polypropylene composite material system of the present invention.

[0108] The foregoing examples are merely illustrative, used to explain some features of the method described in this invention. The appended claims are intended to claim the broadest possible scope, and the embodiments presented herein are demonstrated by the applicant's actual experimental results. Therefore, the applicant intends that the appended claims are not limited by the selection of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. A low temperature explosive polypropylene composite, characterized in that, The low-temperature blasting polypropylene composite material is prepared by mixing the following components: 55-80 parts of polypropylene, 5-20 parts of filler, 1-5 parts of special fiber, 15-20 parts of toughening agent, 0.1-0.5 parts of mixed compatibilizer, and 0-1.2 parts of auxiliary agent, and then adding the filler and mixing, and melt extruding. The polypropylene is a binary block copolymer polypropylene synthesized by ethylene and propylene. The special fiber is an ultrahigh molecular weight polyethylene fiber with a fiber fineness of 400-800 denier. The mixed compatibilizer comprises polyethylene grafted maleic anhydride and polypropylene grafted maleic anhydride. The filler is selected from one or more of basic magnesium sulfate whiskers, talc powder, calcium carbonate; the D 50 The particle size is 0.5-12 μm.

2. The low temperature blasting polypropylene composite material according to claim 1, characterized in that, The mass ratio of the polyethylene grafted maleic anhydride and the polypropylene grafted maleic anhydride is 1:3-3:

1.

3. The low temperature blasting polypropylene composite of claim 1, wherein, The grafting rate of maleic anhydride in the polyethylene grafted maleic anhydride and the polypropylene grafted maleic anhydride is 0.5-1.6%.

4. The low temperature blasting polypropylene composite of claim 1, wherein, The D 50 The particle size is 0.65 to 1 μm.

5. The low temperature blasting polypropylene composite of claim 1, wherein, The D50 of the calcium carbonate is 1.0 to 2.0 μm. 50 The particle size is 4 to 8 μm.

6. The low temperature blasting polypropylene composite of claim 1, wherein, The toughening agent is selected from one or both of ethylene-octene random copolymer and ethylene-octene block copolymer.

7. The low temperature blasting polypropylene composite of claim 1, wherein, The auxiliary agent is selected from one or more of lubricant, antioxidant, and light stabilizer.

8. Process for the production of the low-temperature explosive polypropylene composite material according to any one of claims 1 to 7, characterized in that, The low-temperature blasting polypropylene composite material is prepared by mixing the following components: 55-80 parts of polypropylene, 5-20 parts of filler, 1-5 parts of special fiber, 15-20 parts of toughening agent, 0.1-0.5 parts of mixed compatibilizer, and 0-1.2 parts of auxiliary agent, and then adding the filler and mixing, and melt extruding.

9. The use of the low-temperature blasting polypropylene composite material according to any one of claims 1-7 in the automobile industry.

Images