Crosslinked impact polypropylene and process for its preparation and use

Abstract

The application discloses a novel crosslinking impact polypropylene and a preparation method and application thereof, and relates to a crosslinking impact polypropylene containing a thermoreversible chemical bond, which is prepared by the reaction of the following components: a polyolefin elastomer, a polypropylene resin, acryloxyacetaldehyde and / or methacryloxyacetaldehyde, a diamine compound, a free radical initiator, a free radical stabilizer and the like. The crosslinking impact polypropylene has excellent mechanical properties, improved impact resistance and bending modulus, and also has the characteristics of repeated processing, and the performance of the material can be maintained after multiple processing.

Description

TECHNICAL FIELD

[0001] The present application relates to a preparation method of impact polypropylene, in particular to a cross-linked impact polypropylene containing a thermally reversible chemical bond and a preparation method and application thereof. BACKGROUND

[0002] Mixing polyolefin elastomer and polyolefin resin can significantly improve the toughness of the resin and obtain an impact polymer with excellent performance. Among them, toughening isotactic polypropylene with ethylene / propylene copolymer elastomer (commonly known as "ethylene-propylene rubber") can obtain high-performance impact polypropylene. In recent years, with the rapid development of the automobile industry, high-speed trains, construction industry, and electronic and telecommunication industry, the production of impact polypropylene has increased significantly, and the market has put forward higher requirements for the performance of impact polypropylene. In terms of composition, impact polypropylene is a blend of ethylene-propylene rubber and polypropylene resin. In terms of micro-phase structure, a good performance impact polypropylene requires the ethylene-propylene rubber phase to be uniformly dispersed in the polypropylene resin phase. Among them, the polypropylene matrix phase, the ethylene-propylene rubber dispersed phase, and the interface between the two phases jointly determine the final performance of the material. For decades, the main means for improving its performance has been focused on the structure optimization of polypropylene and ethylene-propylene copolymer. Many research institutions including Zhejiang University have done a lot of work on polymerization process control (Ind Eng Chem Res, 2013, 52, 9775-9782); the Chinese Academy of Sciences, etc. added 1,9-decadiene into the ethylene-propylene copolymerization reaction to in-situ cross-link the ethylene-propylene copolymer during the polymerization process to inhibit the coalescence of the rubber phase, and prepared an impact polypropylene with a rubber phase content of more than 50% and uniform dispersion (Polymer, 2016, 85, 10-18). However, how to strengthen the interfacial force between the two phases has always been a difficult problem.

[0003] This problem is fundamentally due to the fact that both the resin phase and the rubber phase are saturated non-polar polymers, and there is no chemical bonding or strong physical interaction between the two phases. Dynamic covalent chemistry, as an important method that has attracted widespread attention in the field of polymer synthesis in recent years, provides the possibility for overall upgrading of the performance of impact polypropylene. SUMMARY

[0004] The present application aims to provide a new type of cross-linked impact polypropylene and a preparation method and application thereof. The cross-linked impact polypropylene of the present application has thermal reversibility and also improves its impact resistance and flexural modulus.

[0005] To achieve the above-mentioned purpose, the first application provides a cross-linked impact polypropylene, which is obtained by mixing the following components:

[0006] a. polyolefin elastomer A;

[0007] b. polypropylene resin B;

[0008] c. acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C;

[0009] d. diamine compound D,

[0010] H2N-R 1 -NH2

[0011] wherein R 1 is a linear alkane having 1 to 12 carbon atoms;

[0012] e. radical initiator E; and

[0013] f. radical stabilizer F.

[0014] In one embodiment, the polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene is 20% to 80%, preferably 40% to 60% of the total mass of A; the mass content of propylene is 20% to 80%, preferably 40% to 60% of the total mass of A; the mass content of A, as xylene cold soluble, is 10% to 50%, preferably 20% to 40% of the total mass of (A+B).

[0015] In one embodiment, the polypropylene resin B is isotactic polypropylene, the mass content of B, as xylene cold insoluble, is 50% to 90%, preferably 60% to 70% of the total mass of (A+B).

[0016] In one embodiment, the mass content of component C is 0.5% to 10%, preferably 2% to 5% of the total mass of components a to f.

[0017] In one embodiment, R 1 is ethyl, n-butyl, n-hexyl or n-octyl; the mass content of component D is 0.5% to 10%, preferably 2% to 5% of the total mass of components a to f.

[0018] In one embodiment, the radical initiator E is selected from thermal decomposition radical initiators, organic peroxides or azo initiators, preferably alkyl peroxides, hydroperoxides, acyl peroxides, peroxy carbonates; the mass content of the radical initiator E is 0.01% to 1%, preferably 0.05% to 0.5%, more preferably 0.1% to 0.5% of the total mass of components a to f.

[0019] In one embodiment, the radical stabilizer F is selected from at least one of hindered phenol antioxidants, phosphite antioxidants, and alkyl ester antioxidants; the mass content of the radical stabilizer F is 0.05% to 1%, preferably 0.1% to 0.5% of the total mass of components a to f.

[0020] In an embodiment, the crosslinked impact polypropylene has the following properties:

[0021] (1) a melting temperature of no less than 140℃;

[0022] (2) a melt index of 25g / 10min to 100g / 10min (determined according to GB / T3682-2000);

[0023] (3) a notched impact strength of no less than 20kJ / m 2 (determined according to GB / T1043.1-2008);

[0024] (4) a flexural modulus of no less than 700MPa (determined according to GB / T9341-2008);

[0025] (5) the amount of component C incorporated into polyolefin elastomer A is 0.1% to 5% of the total mass of polyolefin elastomer A, preferably 0.5% to 1%; the amount of component C incorporated into polypropylene resin B is 0.1% to 5% of the total mass of polypropylene resin B, preferably 1% to 2%;

[0026] (6) a gel content of less than 5wt%, preferably less than 2wt%, more preferably less than 1wt%.

[0027] In an embodiment, the melt index of the crosslinked impact polypropylene is 0.5-2 times, preferably 0.8-1.5 times, more preferably 0.8-1.2 times, of the melt index of the mixture of raw materials (polyolefin elastomer A + polypropylene resin B).

[0028] The present application also provides a preparation method of the crosslinked impact polypropylene, which comprises mixing and reacting components a to f in an extruder to obtain the crosslinked impact polypropylene.

[0029] The present application further provides an application of the crosslinked impact polypropylene, which is used in polyolefin molded articles.

[0030] The application provides a novel crosslinked impact polypropylene, which uses a thermal reversible Vitrimer reaction between aldehyde groups and amine groups to improve the performance of the impact polypropylene, specifically, reversible chemical bonds are formed between a polypropylene resin and a polyolefin elastomer by reacting acryloxyacetaldehyde and / or methacryloxyacetaldehyde with a diamine compound, so that the interfacial interaction between the polypropylene resin and the polyolefin elastomer is strengthened; and the chemical bonds between the polypropylene resin and the polyolefin elastomer in the crosslinked impact polypropylene can be dissociated during processing, so that the crosslinked impact polypropylene restores plasticity, thereby innovatively solving the problem of weak interfacial interaction force and endowing the material with brand-new performance. Compared with a thermal reversible Diels-Alder reaction formed between a furan group and a bismaleimide group, the Vitrimer chemical bond formed by the aldehyde group and the amine group has a more controllable crosslinking density, so that the formed crosslinked impact polypropylene has better performance stability.

[0031] The novel crosslinked impact polypropylene of the application is prepared by reacting a polyolefin elastomer, a polypropylene resin, a reactive component containing an aldehyde group substituent, a component containing a diamine group, a free radical initiator and a free radical stabilizer, and the crosslinked impact polypropylene containing thermal reversible chemical bonds is obtained. The crosslinked impact polypropylene has excellent mechanical properties, improved impact resistance and bending modulus, and also has the characteristics of repeated processing, and the performance of the crosslinked impact polypropylene can still be maintained after multiple processing. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The scanning electron microscope photo of the sample cross section of Example 8 after etching by n-hexane.

[0033] Figure 2 The scanning electron microscope photo of the sample cross section of Comparative Example 3 after etching by n-hexane.

[0034] Figure 3 The infrared spectrum of the product obtained in Example 1 and Comparative Example 5.

[0035] Figure 4 The reaction formula of the crosslinked impact polypropylene of the application and the structural formula of the crosslinked impact polypropylene. DETAILED DESCRIPTION

[0036] The application provides a novel crosslinked impact polypropylene, a preparation method and application thereof, and the first application provides a crosslinked impact polypropylene, which is obtained by mixing and reacting the following components:

[0037] a. a polyolefin elastomer A;

[0038] b. a polypropylene resin B;

[0039] c. acryloxyacetaldehyde and / or methacryloxyacetaldehyde C;

[0040] d. a diamine compound D,

[0041] H2N-R 1 -NH2

[0042] wherein R 1 is a linear alkane having 1 to 12 carbon atoms;

[0043] e. a radical initiator E; and

[0044] f. a radical stabilizer F.

[0045] The second invention provides a crosslinked impact polypropylene according to the first invention, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene is 20 to 80% of the total mass of A, preferably 40 to 60%; the mass content of propylene is 20 to 80% of the total mass of A, preferably 40 to 60%; the mass content of A is 10 to 50%, preferably 20 to 40% of the total mass of (A+B) as measured by xylene room temperature solubles. The crosslinked impact polypropylene of this second invention comprises: the polyolefin elastomer A, the polypropylene resin B, the acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C, the diamine compound D, the radical initiator E, and the radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene is 20 to 80% of the total mass of A, preferably 40 to 60%; the mass content of propylene is 20 to 80% of the total mass of A, preferably 40 to 60%; the mass content of A is 10 to 50%, preferably 20 to 40% of the total mass of (A+B) as measured by xylene room temperature solubles, and the mass content of B is 50 to 90%, preferably 60 to 70% of the total mass of (A+B); the kind of component B, and the kind and amount of components C to F are not particularly limited.

[0046] The third invention provides a crosslinked impact polypropylene according to the first invention or the second invention, wherein the polypropylene resin B is an isotactic polypropylene, and the mass content of B is 50 to 90%, preferably 60 to 70% of the total mass of (A+B) as measured by xylene room temperature insolubles. The crosslinked impact polypropylene of this third invention comprises any one of the following:

[0047] (1) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the polypropylene resin B is isotactic polypropylene, the mass content of A, B is 50 to 90% of the total mass of (A+B), preferably 60 to 70%, the mass content of A is 10 to 50% of the total mass of (A+B), preferably 20 to 40%, the kind of component A, and the kind and addition amount of components C to F are not particularly limited;

[0048] (2) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene is 20 to 80% of the total mass of A, preferably 40 to 60%, the mass content of propylene is 20 to 80% of the total mass of A, preferably 40 to 60%, the polypropylene resin B is isotactic polypropylene, the mass content of A, B is 10 to 50% of the total mass of (A+B), preferably 20 to 40%, the mass content of B is 50 to 90% of the total mass of (A+B), preferably 60 to 70%, and the kind and addition amount of components C to F are not particularly limited.

[0049] The fourth invention provides crosslinked impact polypropylene according to any one of the first to third inventions, wherein the addition mass of component C is 0.5 to 10%, preferably 2 to 5%, of the total mass of components a to f. The crosslinked impact polypropylene of this fourth invention comprises any one of:

[0050] (1) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the addition mass of component C is 0.5 to 10%, preferably 2 to 5%, of the total mass of components a to f, and the kind and addition amount of components A, B, and D to F are not particularly limited;

[0051] (2) The crosslinked impact polypropylene comprises: a polyolefin elastomer A, a polypropylene resin B, an acryloyloxyacetaldehyde and / or a methacryloyloxyacetaldehyde C, a diamine compound D, a radical initiator E, and a radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, the mass content of ethylene is 20 to 80% of the total mass of A, and the mass content of propylene is 20 to 80% of the total mass of A; A and B are measured by xylene-soluble matter, the mass content of A is 10 to 50% of the total mass of (A+B), and the mass content of B is 50 to 90% of the total mass of (A+B); the added mass of component C is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; and the type of component B, and the type and added amount of components D to F are not particularly limited.

[0052] (3) The crosslinked impact polypropylene comprises: a polyolefin elastomer A, a polypropylene resin B, an acryloyloxyacetaldehyde and / or a methacryloyloxyacetaldehyde C, a diamine compound D, a radical initiator E, and a radical stabilizer F, wherein the polypropylene resin B is isotactic polypropylene, A and B are measured by xylene-soluble matter, the mass content of B is 50 to 90% of the total mass of (A+B), and the mass content of A is 10 to 50% of the total mass of (A+B); the added mass of component C is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; and the type of component A, and the type and added amount of components D to F are not particularly limited.

[0053] (4) The crosslinked impact polypropylene comprises: a polyolefin elastomer A, a polypropylene resin B, an acryloyloxyacetaldehyde and / or a methacryloyloxyacetaldehyde C, a diamine compound D, a radical initiator E, and a radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, the mass content of ethylene is 20 to 80% of the total mass of A, and the mass content of propylene is 20 to 80% of the total mass of A; the polypropylene resin B is isotactic polypropylene; A and B are measured by xylene-soluble matter, the mass content of A is 10 to 50% of the total mass of (A+B), and the mass content of B is 50 to 90% of the total mass of (A+B); the added mass of component C is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; and the type and added amount of components D to F are not particularly limited.

[0054] The fifth application provides the crosslinked impact polypropylene according to any one of the first application to the fourth application, wherein R 1It is ethyl, n-butyl, n-hexyl, or n-octyl; the added mass of component D is 0.5% to 10% of the total mass of components a to f, preferably 2% to 5%. The crosslinked impact-resistant polypropylene of this fifth invention includes any of the following:

[0055] (1) Crosslinked impact-resistant polypropylene comprises: polyolefin elastomer A, polypropylene resin B, acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C, diamine compound D, free radical initiator E, and free radical stabilizer F, wherein the component D has an R 1 The components are ethyl, n-butyl, n-hexyl, or n-octyl; the added mass of component D is 0.5% to 10% of the total mass of components a to f, preferably 2% to 5%; the types and amounts of components A to C and components E to F are not particularly limited;

[0056] (2) The cross-linked impact-resistant polypropylene comprises: polyolefin elastomer A, polypropylene resin B, acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C, diamine compound D, free radical initiator E, and free radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene accounts for 20% to 80% of the total mass of A, preferably 40% to 60%; the mass content of propylene accounts for 20% to 80% of the total mass of A, preferably 40% to 60%; based on xylene solubles at room temperature, the mass content of A is 10% to 50% of the total mass of (A+B), preferably 20% to 40%, and the mass content of B is 50% to 90% of the total mass of (A+B), preferably 60% to 70%; the added mass of component D is 0.5% to 10% of the total mass of components a to f, preferably 2% to 5%; the type of component B, and the type and amount of components C, E, and F are not particularly limited.

[0057] (3) The cross-linked impact-resistant polypropylene comprises: polyolefin elastomer A, polypropylene resin B, acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C, diamine compound D, free radical initiator E, and free radical stabilizer F, wherein the polypropylene resin B is isotactic polypropylene, and the mass content of A and B, based on xylene insoluble matter at room temperature, is 50% to 90% of the total mass of (A+B), preferably 60% to 70%, and the mass content of A is 10% to 50% of the total mass of (A+B), preferably 20% to 40%; the added mass of component D is 0.5% to 10% of the total mass of components a to f, preferably 2% to 5%; the type of component A, and the type and amount of components C, E, and F are not particularly limited.

[0058] (4) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the added amount of component C is 0.5 to 10%, preferably 2 to 5% of the total amount of components a to f; the added amount of component D is 0.5 to 10%, preferably 2 to 5% of the total amount of components a to f; and the kinds and added amounts of components A, B, and E to F are not particularly limited;

[0059] (5) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, the mass content of ethylene is 20 to 80%, preferably 40 to 60% of the total mass of A, and the mass content of propylene is 20 to 80%, preferably 40 to 60% of the total mass of A; the polypropylene resin B is isotactic polypropylene; the mass content of A, based on the xylene room temperature soluble fraction, is 10 to 50%, preferably 20 to 40% of the total mass of (A+B), and the mass content of B is 50 to 90%, preferably 60 to 70% of the total mass of (A+B); the added amount of component D is 0.5 to 10%, preferably 2 to 5% of the total amount of components a to f; and the kinds and added amounts of components C, E, and F are not particularly limited.

[0060] (6) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, the mass content of ethylene is 20 to 80%, preferably 40 to 60% of the total mass of A, and the mass content of propylene is 20 to 80%, preferably 40 to 60% of the total mass of A; A, B, based on the xylene room temperature soluble fraction, A is 10 to 50%, preferably 20 to 40% of the total mass of (A+B), and B is 50 to 90%, preferably 60 to 70% of the total mass of (A+B); the added amount of component C is 0.5 to 10%, preferably 2 to 5% of the total amount of components a to f; the added amount of component D is 0.5 to 10%, preferably 2 to 5% of the total amount of components a to f; and the kind of component B, and the kinds and added amounts of components D to F are not particularly limited.

[0061] (7) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the polypropylene resin B is isotactic polypropylene, the mass content of A, B based on xylene normal temperature insoluble is 50 to 90% of the total mass of (A+B), preferably 60 to 70%, the mass content of A is 10 to 50% of the total mass of (A+B), preferably 20 to 40%; the added mass of component C is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; the added mass of component D is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; the kind of component A, and the kind and added amount of components E to F are not particularly limited;

[0062] (8) Crosslinked impact polypropylene comprising: polyolefin elastomer A, polypropylene resin B, acryloxyacetaldehyde and / or methacryloxyacetaldehyde C, diamine compound D, radical initiator E, and radical stabilizer F, wherein the polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene is 20 to 80% of the total mass of A, preferably 40 to 60%; the mass content of propylene is 20 to 80% of the total mass of A, preferably 40 to 60%; the polypropylene resin B is isotactic polypropylene; the mass content of A, B based on xylene normal temperature soluble is 10 to 50% of the total mass of (A+B), preferably 20 to 40%, the mass content of B is 50 to 90% of the total mass of (A+B), preferably 60 to 70%; the added mass of component C is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; the added mass of component D is 0.5 to 10% of the total mass of components a to f, preferably 2 to 5%; the kind and added amount of components E to F are not particularly limited.

[0063] The kind and added amount of the radical initiator E of the present application are not particularly limited, preferably, the radical initiator E is selected from thermal decomposition radical initiators, organic peroxides or azo initiators, preferably alkyl peroxides, hydroperoxides, acyl peroxides, peroxycarbonates; the added mass of the radical initiator E is 0.01 to 1% of the total mass of components a to f, preferably 0.05 to 0.5%, more preferably 0.1 to 0.5%.

[0064] The kind and added amount of the radical stabilizer F of the present application are not particularly limited, preferably, the radical stabilizer F is selected from at least one of hindered phenol antioxidants, phosphite antioxidants, and alkyl ester antioxidants; the added mass of the radical stabilizer F is 0.05 to 1% of the total mass of components a to f, preferably 0.1 to 0.5%.

[0065] The crosslinked impact polypropylene of the present application has the following properties:

[0066] (1) a melting temperature of no less than 140℃;

[0067] (2) a melt index of 25g / 10min to 100g / 10min (determined according to GB / T3682-2000);

[0068] (3) a notched impact strength of no less than 20kJ / m 2 (determined according to GB / T1043.1-2008);

[0069] (4) a flexural modulus of no less than 700MPa (determined according to GB / T9341-2008);

[0070] (5) the amount of the component C incorporated into the polyolefin elastomer A is 0.1% to 5% of the total mass of the polyolefin elastomer A, preferably 0.5% to 1%; the amount of the component C incorporated into the polypropylene resin B is 0.1% to 5% of the total mass of the polypropylene resin B, preferably 1% to 2%;

[0071] (6) a gel content of less than 5wt%, preferably less than 2wt%, more preferably less than 1wt%.

[0072] Preferably, the melt index of the crosslinked impact polypropylene of the present application is 0.5-2 times, preferably 0.8-1.5 times, more preferably 0.8-1.2 times of the melt index of the mixture of raw materials (polyolefin elastomer A + polypropylene resin B).

[0073] The present application also provides a preparation method of the crosslinked impact polypropylene, which comprises mixing and reacting components a to f in an extruder to obtain the crosslinked impact polypropylene.

[0074] The present application further provides an application of the crosslinked impact polypropylene, which is used in polyolefin shaped products.

[0075] The present application will be further described in detail below in combination with specific examples, but the present application is not limited by the following examples. Any modification that does not go beyond the concept and scope of the present application is within the scope of the present application. Component C:

[0076] C1: acryloyloxyacetaldehyde (CAS No. 150753-10-9, ), the structural formula of which is as follows:

[0077]

[0078] C2: Methacryloxyacetaldehyde (CAS No.: 68103-82-2), its structural formula is as follows:

[0079]

[0080] Component D:

[0081] Including but not limited to the following structures:

[0082] D1: 1,4-Butanediamine (CAS No.: 110-60-1, purchased from Sigma Aldrich)

[0083] D2: 1,6-Hexanediamine (CAS No.: 124-09-4, purchased from Sigma Aldrich)

[0084] D3: 1,8-Octadiamine (CAS No.: 373-44-4, purchased from Sigma Aldrich)

[0085] Other raw materials and sources:

[0086] Polyolefin elastomer: purchased from Lanzhou Petrochemical Branch of China National Petroleum Corporation;

[0087] Isotactic polypropylene: purchased from Lanzhou Petrochemical Branch of China National Petroleum Corporation, with a notched impact strength of 2.0 kJ / m³ at 23°C. 2 The flexural modulus is 1200 MPa;

[0088] Dimethyl-2,5-di(tert-butylperoxy)hexane: purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0089] Dicumyl peroxide: purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0090] Antioxidants 1010 and 168: purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0091] Analysis or detection methods:

[0092] Melt Flow Index (MFR): Determined according to GB / T3682-2000 method;

[0093] Melting temperature: determined by differential scanning calorimetry (DSC);

[0094] Xylene solubles at room temperature: determined according to GB / T24282-2021 method;

[0095] Ethylene content in component A: Carbon NMR spectrum ( 13 3C-NMR determination;

[0096] Actual amount of component C incorporated in component A or component B: determined by nuclear magnetic resonance hydrogen spectrum (H-NMR); 1 H-NMR) measurement;

[0097] Gel content: the pre-weighed sample (m1) was placed in a Soxhlet extractor, extracted with xylene for 48 h, the remaining sample in the extractor was taken out, dried and weighed (m2), and the gel content = (m2 / m1) x 100%;

[0098] Notched impact strength: determined according to GB / T 1043.1-2008 method;

[0099] Flexural modulus: determined according to GB / T 9341-2008 method.

[0100] Example 1

[0101] A mixture of 25 parts of polyolefin elastomer (in which the mass content of ethylene accounts for 52% of the total mass of the polyolefin elastomer, and the mass content of propylene accounts for 48% of the total mass of the polyolefin elastomer), 75 parts of isotactic polypropylene mixture 1 (melt index MFR = 50 g / 10 min; xylene room temperature soluble content 25 wt%), 0.1 part of 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane (radical initiator E), 0.1 part of 1010 (radical stabilizer F), 0.2 part of 168 (radical stabilizer F), 1 part of component C1 of the application, 0.6 part of component D1 of the application was mixed, and then the mixture was added to a twin-screw extruder for melting. The temperature of the extruder was 190°C, the residence time was 90 s, the extruded product was cooled by circulating water bath and pelletized to obtain the final product.

[0102] Example 2

[0103] A mixture of 25 parts of polyolefin elastomer (in which the mass content of ethylene accounts for 52% of the total mass of the polyolefin elastomer, and the mass content of propylene accounts for 48% of the total mass of the polyolefin elastomer), 75 parts of isotactic polypropylene mixture 1 (melt index MFR = 50 g / 10 min; xylene room temperature soluble content 25 wt%), 0.2 parts of dicumyl peroxide, 0.1 parts of 1010, 0.2 parts of 168, 6 parts of component C1 of the application, 11 parts of component D1 of the application was mixed, and then the mixture was added to a twin-screw extruder for melting. The temperature of the extruder was 190°C, the residence time was 60 s, the extruded product was cooled by circulating water bath and pelletized to obtain the final product.

[0104] Example 3

[0105] A mixture of 100 parts of the product obtained in Example 1, 0.1 parts of Irgatec® 1010, 0.2 parts of Irgatec® 168, 3.5 parts of the component C1 of the present application, 0.6 parts of the component D2 of the present application is mixed and then the mixture is fed into a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to give the final product.

[0106] Example 4

[0107] A mixture of 100 parts of the product obtained in Example 3, 0.1 parts of Irgatec® 1010, 0.2 parts of Irgatec® 168 is mixed and then the mixture is fed into a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to give the final product.

[0108] Example 5

[0109] A mixture of 100 parts of the product obtained in Example 4, 0.1 parts of Irgatec® 1010, 0.2 parts of Irgatec® 168 is mixed and then the mixture is fed into a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 60 s, the extruded product is cooled in a circulating water bath and pelletized to give the final product.

[0110] Example 6

[0111] A mixture of 100 parts of the product obtained in Example 5, 0.1 parts of Irgatec® 1010, 0.2 parts of Irgatec® 168 is mixed and then the mixture is fed into a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 60 s, the extruded product is cooled in a circulating water bath and pelletized to give the final product.

[0112] Example 7

[0113] By parts by mass, 36 parts of a mixture of a polyolefin elastomer (in which the mass content of ethylene accounts for 49% of the total mass of the polyolefin elastomer, and the mass content of propylene accounts for 51% of the total mass of the polyolefin elastomer), 64 parts of isotactic polypropylene 2 (melt index MFR = 50 g / 10 min; xylene room temperature soluble content 37 wt%), 0.15 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 parts of 1010, 0.2 parts of 168, 2 parts of component C2 of the present application, 0.75 parts of component D1 of the present application are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 120 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0114] Example 8

[0115] By parts by mass, 25 parts of a mixture of a polyolefin elastomer (in which the mass content of ethylene accounts for 47% of the total mass of the polyolefin elastomer, and the mass content of propylene accounts for 53% of the total mass of the polyolefin elastomer), 75 parts of isotactic polypropylene 3 (melt index MFR = 30 g / 10 min; xylene room temperature soluble content 25 wt%), 0.2 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 parts of 1010, 0.2 parts of 168, 4 parts of component C1 of the present application, 0.75 parts of component D3 of the present application are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0116] Example 9

[0117] By parts by mass, 25 parts of a mixture of a polyolefin elastomer (in which the mass content of ethylene accounts for 52% of the total mass of the polyolefin elastomer, and the mass content of propylene accounts for 48% of the total mass of the polyolefin elastomer), 75 parts of isotactic polypropylene 1 (melt index MFR = 50 g / 10 min; xylene room temperature soluble content 25 wt%), 0.2 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 parts of 1010, 0.2 parts of 168, 4 parts of component C1 of the present application, 2 parts of component D2 of the present application are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0118] Example 10

[0119] The product obtained in Example 9, 100 parts, 0.1 part of 1010, 0.2 part of 168 are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0120] Example 11

[0121] A mixture of 25 parts of a polyolefin elastomer (in which the mass content of ethylene accounts for 52% of the total mass of the polyolefin elastomer, and the mass content of propylene accounts for 48% of the total mass of the polyolefin elastomer), 75 parts of isotactic polypropylene 1 (melt index MFR = 50 g / 10 min; xylene-soluble content at room temperature 25 wt%), 0.2 parts of dicumyl peroxide, 0.1 part of 1010, 0.2 part of 168, 6 parts of component C1 of the present application, 5 parts of component C2 of the present application, 6 parts of component D1 of the present application are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 60 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0122] Example 12

[0123] The product obtained in Example 1, 100 parts, 0.1 part of 1010, 0.2 part of 168 are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0124] Example 13

[0125] The product obtained in Example 12, 100 parts, 0.1 part of 1010, 0.2 part of 168 are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 60 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0126] Example 14

[0127] The product obtained in Example 13, 100 parts, 0.1 part of 1010, 0.2 part of 168 are mixed, and then the mixture is added to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 60 s, the extruded product is cooled by a circulating water bath and pelletized to obtain the final product.

[0128] Comparative Example 1

[0129] The difference from Example 1 is that no free radical initiator E, component C1 and component D1 are added.

[0130] A mixture of 25 parts of a polyolefin elastomer (in which the mass content of ethylene is 52% of the total mass of the polyolefin elastomer and the mass content of propylene is 48% of the total mass of the polyolefin elastomer), 75 parts of a mixture 1 of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene-soluble matter at room temperature 25 wt%), 0.1 part of 1010, 0.2 part of 168, calculated in parts by mass, is mixed and the mixture is then fed to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0131] Comparative Example 2

[0132] Unlike Example 7, the radical initiator E, component C2 and component D1 are not added.

[0133] A mixture of 36 parts of a polyolefin elastomer (in which the mass content of ethylene is 49% of the total mass of the polyolefin elastomer and the mass content of propylene is 51% of the total mass of the polyolefin elastomer), 64 parts of a mixture 2 of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene-soluble matter at room temperature 37 wt%), 0.1 part of 1010, 0.2 part of 168, calculated in parts by mass, is mixed and the mixture is then fed to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 120 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0134] Comparative Example 3

[0135] Unlike Example 8, the radical initiator E, component C1 and component D3 are not added.

[0136] A mixture of 25 parts of a polyolefin elastomer (in which the mass content of ethylene is 47% of the total mass of the polyolefin elastomer and the mass content of propylene is 53% of the total mass of the polyolefin elastomer), 75 parts of a mixture 3 of isotactic polypropylene (melt index MFR = 30 g / 10 min; content of xylene-soluble matter at room temperature 25 wt%), 0.1 part of 1010, 0.2 part of 168, calculated in parts by mass, is mixed and the mixture is then fed to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0137] Comparative Example 4

[0138] A mixture of 100 parts of the product obtained in Comparative Example 1, 0.1 part of 1010, 0.2 part of 168 is mixed and the mixture is then fed to a twin-screw extruder for melting. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0139] Comparative Example 5

[0140] The difference to Example 1 is that no component D1 is added.

[0141] A mixture of 25 parts of a polyolefin elastomer (wherein the mass content of ethylene amounts to 52% of the total mass of the polyolefin elastomer and the mass content of propylene amounts to 48% of the total mass of the polyolefin elastomer), 75 parts of a mixture 1 of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene room temperature solubles 25 wt%), 0.1 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 parts of 1010, 0.2 parts of 168, 1 part of component C1 according to the application is mixed in parts by mass, and the mixture is subsequently melted in a twin-screw extruder. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0142] Comparative Example 6

[0143] The difference to Example 1 is that no component D1 is added and component C1 is replaced by divinylbenzene.

[0144] A mixture of 25 parts of a polyolefin elastomer (wherein the mass content of ethylene amounts to 52% of the total mass of the polyolefin elastomer and the mass content of propylene amounts to 48% of the total mass of the polyolefin elastomer), 75 parts of a mixture 1 of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene room temperature solubles 25 wt%), 0.1 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 parts of 1010, 0.2 parts of 168, 1 part of divinylbenzene is mixed in parts by mass, and the mixture is subsequently melted in a twin-screw extruder. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0145] Comparative Example 7

[0146] The difference to Example 1 is that no polyolefin elastomer is added.

[0147] A mixture of 100 parts of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene room temperature solubles 0.5 wt%), 0.1 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 parts of 1010, 0.2 parts of 168, 1 part of component C1 according to the application, 0.6 parts of component D1 according to the application is mixed in parts by mass, and the mixture is subsequently melted in a twin-screw extruder. The temperature of the extruder is 190°C, the residence time is 90 s, the extruded product is cooled in a circulating water bath and pelletized to obtain the final product.

[0148] Comparative Example 8

[0149] The difference from Example 1 is that component C1 is not added.

[0150] A mixture of 25 parts of polyolefin elastomer (in which the mass content of ethylene is 52% of the total mass of the polyolefin elastomer and the mass content of propylene is 48% of the total mass of the polyolefin elastomer), 75 parts of mixture 1 of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene room temperature solubles 25 wt%), 0.1 part of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 part of 1010, 0.2 part of 168, 0.6 part of component D1 of the present application, was mixed and the mixture was then fed into a twin-screw extruder for melting. The temperature of the extruder was 190°C, the residence time was 90 s, the extruded product was cooled in a circulating water bath and pelletized to give the final product.

[0151] Comparative Example 9

[0152] The difference from Example 1 is that component C1 is replaced by a furan group-containing styrene and component D1 is replaced by N,N'-(4,4'-methylene diphenyl) bismaleimide.

[0153] A mixture of 25 parts of polyolefin elastomer (in which the mass content of ethylene is 52% of the total mass of the polyolefin elastomer and the mass content of propylene is 48% of the total mass of the polyolefin elastomer), 75 parts of mixture 1 of isotactic polypropylene (melt index MFR = 50 g / 10 min; content of xylene room temperature solubles 25 wt%), 0.1 part of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 part of 1010, 0.2 part of 168, 1 part of a furan group-containing styrene, 0.6 part of N,N'-(4,4'-methylene diphenyl) bismaleimide, was mixed and the mixture was then fed into a twin-screw extruder for melting. The temperature of the extruder was 190°C, the residence time was 90 s, the extruded product was cooled in a circulating water bath and pelletized to give the final product.

[0154] Comparative Example 10

[0155] A mixture of 100 parts of the product of Comparative Example 9, 0.1 part of 1010, 0.2 part of 168, was mixed and the mixture was then fed into a twin-screw extruder for melting. The temperature of the extruder was 190°C, the residence time was 90 s, the extruded product was cooled in a circulating water bath and pelletized to give the final product.

[0156] The properties of the crosslinked impact polypropylenes prepared in the above examples and of the products of the comparative examples were tested and are listed in Table 1 below.

[0157] Table 1 Composition and properties of the products of the examples and comparative examples

[0158]

[0159]

[0160]

[0161] Table 1 is the composition and performance results of the impact polypropylene. From the results of Table 1, it can be seen that the present application improves the notched impact strength of the raw material polyolefin elastomer and polypropylene resin. The crosslinked impact polypropylene obtained in the examples has reversible chemical bonds, and the mechanical properties of the material (mainly the notched impact strength) are significantly higher than those of the comparative sample. As can be seen by comparing Example 1 with Comparative Example 1, Comparative Example 7 with Comparative Example 2, and Comparative Example 8 with Comparative Example 3, the notched impact strength of the crosslinked impact polypropylene prepared in the examples is significantly higher than that of the sample with the same polyolefin elastomer content prepared in the comparative examples, and the flexural modulus is also improved, which shows that the chemical structure formed by the various components of the present application has a significant effect on the improvement of the mechanical properties of the material.

[0162] In addition, from the results of Example 1 and Comparative Examples 5-9, it can be seen that the reversible chemical bonds formed between the polypropylene resin and the polyolefin elastomer by the reaction of acryloxyacetaldehyde and / or methacryloxyacetaldehyde with a diamine compound in the present application strengthen the interfacial interaction, improve the flexural modulus and notched impact strength, and further verify that the various components of the present application have a synergistic effect, and the chemical structure formed has a significant effect on the improvement of the mechanical properties of the material.

[0163] At the same time, the melt index of the material changes little, indicating that the various components of the present application do not affect the processability of the material. In addition, compared with the polypropylene products obtained by the Diels-Alder type thermal reversible reaction between furan and bismaleimide (see Comparative Examples 9 and 10) or other reactions (see Comparative Examples 1 and 4), the Vitrimer type chemical bonds formed by the aldehyde group and the amine group in the crosslinked impact polypropylene of the present application not only have thermal reversibility, but also have more excellent performance stability, so that the material does not decrease in performance after being processed multiple times (see Examples 1, 12, 13, and 14); the results of Examples 3, 4, 5, and 6 further verify that the crosslinked impact polypropylene of the present application has more excellent performance stability, and the material does not decrease in performance after being processed multiple times; and the crosslinked impact polypropylene of the present application contains almost no gel, which can well solve the gelation phenomenon caused by traditional crosslinking reactions (Comparative Example 6).

[0164] As can be seen from the scanning electron microscope photos of the sample cross section, the crosslinked impact polypropylene of Example 8 (as shown in Figure 1) has a more uniform structure than the crosslinked impact polypropylene of Comparative Example 6 (as shown in Figure 2), which further verifies that the crosslinked impact polypropylene of the present application has more excellent performance stability and processability. Figure 1After etching by boiling hexane, only a small amount of polyolefin elastomer was dissolved, and the size of the polyolefin elastomer was uniform and small, indicating that the reversible chemical bond enhanced the interaction between the polypropylene resin phase and the polyolefin elastomer phase; the traditional sample (Comparative Example 3, as shown in FIG. 3) containing the same content of polyolefin elastomer but not containing the reversible chemical bond had a large hole in the cross section after etching by boiling hexane, indicating that a large amount of polyolefin elastomer was dissolved, which was due to the weak interaction between the polypropylene resin and the polyolefin elastomer. This is consistent with the mechanical property results of the materials. Figure 2 After etching by boiling hexane, only a small amount of polyolefin elastomer was dissolved, and the size of the polyolefin elastomer was uniform and small, indicating that the reversible chemical bond enhanced the interaction between the polypropylene resin phase and the polyolefin elastomer phase; the traditional sample (Comparative Example 3, as shown in FIG. 3) containing the same content of polyolefin elastomer but not containing the reversible chemical bond had a large hole in the cross section after etching by boiling hexane, indicating that a large amount of polyolefin elastomer was dissolved, which was due to the weak interaction between the polypropylene resin and the polyolefin elastomer. This is consistent with the mechanical property results of the materials.

[0165] Of course, the present application can have other various embodiments and deformations, and those skilled in the art can make various corresponding changes and deformations according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and deformations should all belong to the protection scope of the claims of the present application.

Claims

1. A crosslinked impact polypropylene, characterized in that, The following components are mixed to obtain a reaction product: a. polyolefin elastomer A; b. polypropylene resin B; c. acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C; d. diamine compound D, H2N-R 1 -NH2 wherein R 1 is a straight-chain alkane of 1 to 12 carbon atoms; e. free radical initiator E; and f. free radical stabilizer F.

2. The crosslinked impact polypropylene according to claim 1, characterized in that, The polyolefin elastomer A is a copolymer of ethylene and propylene, wherein the mass content of ethylene is 20% to 80% of the total mass of the polyolefin elastomer A; the mass content of propylene is 20% to 80% of the total mass of the polyolefin elastomer A; the mass content of the polyolefin elastomer A, as measured by xylene solubles, is 10% to 50% of the total mass of (polyolefin elastomer A + polypropylene resin B).

3. The crosslinked impact polypropylene according to claim 2, characterized in that, The mass content of ethylene is 40% to 60% of the total mass of the polyolefin elastomer A.

4. The crosslinked impact polypropylene according to claim 2, characterized in that, The mass content of propylene is 40% to 60% of the total mass of the polyolefin elastomer A.

5. The crosslinked impact polypropylene of claim 2, wherein, The mass content of the polyolefin elastomer A is 20% to 40% of the total mass of (polyolefin elastomer A + polypropylene resin B).

6. The crosslinked impact polypropylene of claim 1, wherein, The polypropylene resin B is isotactic polypropylene, and the mass content of the polypropylene resin B, as measured by xylene insolubles, is 50% to 90% of the total mass of (polyolefin elastomer A + polypropylene resin B).

7. The crosslinked impact polypropylene according to claim 6, characterized in that, The mass content of the polypropylene resin B is 60% to 70% of the total mass of (polyolefin elastomer A + polypropylene resin B).

8. The crosslinked impact polypropylene of claim 1, wherein, The added mass of the acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C is 0.5% to 10% of the total mass of components a to f.

9. The crosslinked impact polypropylene according to claim 8, characterized in that, The added mass of the acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C is 2% to 5% of the total mass of components a to f.

10. The crosslinked impact polypropylene according to any one of claims 1 to 9, characterized in that, R of the diamine compound D 1 is ethyl, n-butyl, n-hexyl or n-octyl; the addition mass of the diamine compound D is 0.5 to 10% of the total mass of components a to f.

11. The crosslinked impact polypropylene according to claim 10, characterized in that, The added mass of the diamine compound D is 2% to 5% of the total mass of components a to f.

12. The crosslinked impact polypropylene of claim 1, wherein, The free radical initiator E is selected from thermal decomposition free radical initiators; the added mass of the free radical initiator E is 0.01% to 1% of the total mass of components a to f.

13. The crosslinked impact polypropylene according to claim 12, characterized in that, The added mass of the free radical initiator E is 0.05% to 0.5% of the total mass of components a to f.

14. The crosslinked impact polypropylene according to claim 13, characterized in that, The added mass of the free radical initiator E is 0.1% to 0.5% of the total mass of components a to f.

15. The crosslinked impact polypropylene of claim 1, wherein, The free radical initiator E is selected from organic peroxide or azo initiators.

16. The crosslinked impact polypropylene of claim 1, wherein, The free radical initiator E is selected from at least one of alkyl peroxides, hydroperoxides, acyl peroxides, and peroxy carbonates.

17. The crosslinked impact polypropylene of claim 1, wherein, The free radical stabilizer F is selected from at least one of hindered phenol antioxidants, phosphite antioxidants, and alkyl ester antioxidants; the added mass of the free radical stabilizer F is 0.05% to 1% of the total mass of components a to f.

18. The crosslinked impact polypropylene of claim 17, wherein, The added mass of the free radical stabilizer F is 0.1% to 0.5% of the total mass of components a to f.

19. The crosslinked impact polypropylene of claim 1, wherein, The crosslinked impact polypropylene has the following properties: (1) a melting temperature of no less than 140°C; (2) a melt index of 25 g / 10 min to 100 g / 10 min, as determined according to GB / T 3682-2000; (3) a notched impact strength of not less than 20 kJ / m 2 determined according to GB / T 1043.1-2008; (4) a flexural modulus of no less than 700 MPa, as determined according to GB / T 9341-2008; (5) the amount of acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C incorporated in the polyolefin elastomer A is 0.1% to 5% of the total mass of the polyolefin elastomer A; the amount of acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C incorporated in the polypropylene resin B is 0.1% to 5% of the total mass of the polypropylene resin B; (6) a gel content of less than 5 wt%.

20. The crosslinked impact polypropylene of claim 19, wherein, the amount of acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C incorporated in the polyolefin elastomer A is 0.5% to 1% of the total mass of the polyolefin elastomer A.

21. The crosslinked impact polypropylene of claim 19, wherein, the amount of acryloyloxyacetaldehyde and / or methacryloyloxyacetaldehyde C incorporated in the polypropylene resin B is 1% to 2% of the total mass of the polypropylene resin B.

22. The crosslinked impact polypropylene of claim 19, wherein, a gel content of less than 2 wt%.

23. The crosslinked impact polypropylene of claim 22, wherein, a gel content of less than 1 wt%.

24. The crosslinked impact polypropylene of claim 1, wherein, the melt index of the crosslinked impact polypropylene is 0.5-2 times the melt index of the raw material mixture, the raw material being polyolefin elastomer A + polypropylene resin B.

25. The crosslinked impact polypropylene of claim 24, wherein, the melt index of the crosslinked impact polypropylene is 0.8-1.5 times the melt index of the raw material mixture.

26. The crosslinked impact polypropylene of claim 25, wherein, the melt index of the crosslinked impact polypropylene is 0.8-1.2 times the melt index of the raw material mixture.

27. A process for the preparation of the crosslinked impact polypropylene according to any one of claims 1 to 26, characterized in that, comprising: mixing and reacting components a to f in an extruder to obtain the crosslinked impact polypropylene.

28. Use of a crosslinked impact polypropylene according to any of claims 1 to 26, characterized in that the crosslinked impact polypropylene is used for polyolefin shaped articles.

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