Anti-impact co-polypropylene and preparation method thereof

Abstract

The invention relates to the field of impact-resistant co-polypropylene and a preparation method thereof, and discloses impact-resistant co-polypropylene and a preparation method thereof. The preparation method comprises the following steps: (1) testing MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of a competitive control; (2) selecting a main material 1; (3) selecting an auxiliary material 1 and / or an auxiliary material 2; (4) the content of the main material, the content of the auxiliary material 1 and the content of the auxiliary material 2 meet the formula (a); (5) the MFR content, the EPR content and the ethylene content of a new simulated product are calculated; (6) adjusting W% to determine the feeding amount; and (7) calculating the feeding of the main material, the auxiliary material 1 and / or the auxiliary material 2 according to W% or W adjusted%, and preparing to obtain the impact-resistant co-polypropylene. # imgabs0 #

Description

Technical Field

[0001] The invention relates to the field of impact-resistant copolymer polypropylene and a preparation method thereof, and in particular to impact-resistant copolymer polypropylene and a preparation method thereof. Background Art

[0002] Impact copolymer polypropylene has the rigidity of polypropylene and the impact resistance of EPDM components. Especially with the development of the fourth-generation Ziegler-Natta catalyst and propylene polymerization process, it is widely used in home appliances, injection molding containers, automobiles and packaging materials. Due to their numerous grades, it is a challenge for material suppliers, manufacturers and product developers to manage such a wide range of materials.

[0003] Impact copolymer polypropylene (IPC) is a complex mixture, including polypropylene (PP), ethylene-propylene rubber (EPR), ethylene-propylene block copolymer and a very small amount of linear low-density polyethylene. The microscopic spatial structure presents a multi-layer core-shell structure. A significant advantage of IPC is that it can obtain a close mixing of components within a wide molecular weight range. Each component has different functions and good compatibility. After melt mixing, each component enters the continuous phase, dispersed phase or two-phase interface.

[0004] Therefore, it is of great significance to research and develop a new IPC product by combining 2-3 IPC raw materials and PP raw materials. Summary of the invention

[0005] The purpose of the present invention is to overcome the defect that it takes a long time to improve the rigidity-toughness balance performance of IPC raw materials through polymerization process in the prior art, and to provide an impact-resistant copolymer polypropylene and a preparation method thereof. The present invention uses several IPC raw materials and PP raw materials to prepare IPC with specific mechanical properties, so as to quickly improve the rigidity-toughness balance performance of the raw materials.

[0006] In order to achieve the above object, the first aspect of the present invention provides a method for preparing impact-resistant copolymer polypropylene, wherein the preparation method comprises:

[0007] (1) Testing the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control;

[0008] (2) Selecting the main ingredient 1: selecting the main ingredient 1 based on the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are closest to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the main ingredient 1;

[0009] (3) Selecting auxiliary material 1 and / or auxiliary material 2: selecting auxiliary material 1 and / or auxiliary material 2 according to the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are the second closest to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of auxiliary material 1 and / or auxiliary material 2, and the difference of the second closest is greater than the difference of the first close;

[0010] (4) Determining the amount of the main material 1, the auxiliary material 1 and / or the auxiliary material 2; wherein the content of the main material, the auxiliary material 1 and the auxiliary material 2 satisfies the formula shown in formula (a):

[0011]

[0012] Wherein, W% is the total amount of the auxiliary material 1 and the auxiliary material 2, %;

[0013] IPP 主料 ——IPP content of the main ingredient, %;

[0014] IPP 辅料1 ——IPP content of the auxiliary material 1, %;

[0015] IPP 辅料2 ——IPP content of the auxiliary material 2, %;

[0016] IPP 竞争对照物 ——IPP content of competitive control, %;

[0017] m——the addition ratio of auxiliary material 1, n——the addition ratio of auxiliary material 2;

[0018] m:n=(1-5):(0-5);

[0019] The addition amount of the main material is 100%-W%;

[0020] (5) Calculating the MFR, EPR content and ethylene content of the simulated new product according to equations (b), (c) to (d);

[0021]

[0022]

[0023]

[0024] (6) Adjustment of W%: The difference in MFR, EPR content and ethylene content between the simulated new product and the competitive control meets the following conditions:

[0025] The absolute deviation of MFR is ±1.5g / 10min;

[0026] and / or, the absolute deviation of EPR content is ±1.5%;

[0027] and / or, the absolute deviation of ethylene content is ±1.5%;

[0028] If the MFR, EPR content and ethylene content of the simulated new product and the competitive control meet the above conditions, there is no need to adjust W%;

[0029] If the MFR, EPR content and ethylene content of the simulated new product and the competitive control do not meet the above conditions, it is necessary to adjust W% so that the adjusted W% 调整后 % meets the above conditions;

[0030] (7) Based on W% or adjusted W 调整后 %, and the amount of the main material, the auxiliary material 1 and / or the auxiliary material 2 is calculated according to formula (b), formula (c) to formula (d), and the impact-resistant copolymer polypropylene is obtained through mixing, granulation or melt compounding.

[0031] The second aspect of the present invention provides an impact-resistant copolymer polypropylene prepared by the above-mentioned preparation method.

[0032] Through the above technical solution, the beneficial effects of the present invention include:

[0033] (1) The present invention aims to prepare IPC with specific mechanical properties by using several (2-3) IPC raw materials and PP raw materials for mixed granulation or melt compounding. When the market is short of materials, other raw materials are often needed to replace them, or two raw materials are mixed for use. Based on this, the present invention can provide a new solution for managing materials or suppliers.

[0034] (2) Another notable feature of the present invention is the use of 13 The IPP content in IPC is detected by a desktop NMR calibrated with C-NMR. Compared with traditional methods, such as solvent distillation and solid NMR, this method is more convenient and the detection time is shortened to 35-40 minutes. DETAILED DESCRIPTION

[0035] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0036] As mentioned above, the first aspect of the present invention provides a method for preparing impact-resistant copolymer polypropylene, wherein the preparation method comprises:

[0037] (1) Testing the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control;

[0038] (2) Selecting the main ingredient 1: selecting the main ingredient 1 based on the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are closest to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the main ingredient 1;

[0039] (3) Selecting auxiliary material 1 and / or auxiliary material 2: selecting auxiliary material 1 and / or auxiliary material 2 according to the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are the second closest to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of auxiliary material 1 and / or auxiliary material 2, and the difference of the second closest is greater than the difference of the first close;

[0040] (4) Determining the amount of the main material 1, the auxiliary material 1 and / or the auxiliary material 2; wherein the content of the main material, the auxiliary material 1 and the auxiliary material 2 satisfies the formula shown in formula (a):

[0041]

[0042] Wherein, W% is the total amount of the auxiliary material 1 and the auxiliary material 2, %;

[0043] IPP 主料 ——IPP content of the main ingredient, %;

[0044] IPP 辅料1 ——IPP content of the auxiliary material 1, %;

[0045] IPP 辅料2 ——IPP content of the auxiliary material 2, %;

[0046] IPP 竞争对照物 ——IPP content of competitive control, %;

[0047] m——the addition ratio of auxiliary material 1, n——the addition ratio of auxiliary material 2;

[0048] m:n=(1-5):(0-5);

[0049] The addition amount of the main material is 100%-W%;

[0050] (5) Calculating the MFR, EPR content and ethylene content of the simulated new product according to equations (b), (c) to (d);

[0051]

[0052]

[0053]

[0054] (6) Adjustment of W%: The difference in MFR, EPR content and ethylene content between the simulated new product and the competitive control meets the following conditions:

[0055] The absolute deviation of MFR is ±1.5g / 10min;

[0056] and / or, the absolute deviation of EPR content is ±1.5%;

[0057] and / or, the absolute deviation of ethylene content is ±1.5%;

[0058] If the MFR, EPR content and ethylene content of the simulated new product and the competitive control meet the above conditions, there is no need to adjust W%;

[0059] If the MFR, EPR content and ethylene content of the simulated new product and the competitive control do not meet the above conditions, it is necessary to adjust W% so that the adjusted W% 调整后 % meets the above conditions;

[0060] (7) Based on W% or adjusted W 调整后 %, and the amount of the main material, the auxiliary material 1 and / or the auxiliary material 2 is calculated according to formula (b), formula (c) to formula (d), and the impact-resistant copolymer polypropylene is obtained through mixing, granulation or melt compounding.

[0061] The inventors of the present invention discovered that in order to quickly mix several raw materials and make their performance similar to that of the target product (competitive control) so that they can replace the target product (competitive control), the inventors of the present invention selected several (2-3) IPC raw materials and PP raw materials by mixed granulation or melt compounding through the parameters of melt flow rate (MFR), IPP content, EPR content and ethylene content to prepare IPC with specific flexural modulus and impact strength, thereby quickly improving the rigidity-toughness balance performance of the raw materials.

[0062] Furthermore, ethylene content and EPR content are key factors affecting the impact strength of IPC. Increasing ethylene content and EPR content is beneficial to improving impact strength, but will reduce the flexural modulus. The higher the IPP content, the more conducive it is to forming a high flexural modulus. After adding a nucleating agent, the flexural modulus will further increase, and the extent of the increase is related to the IPP content.

[0063] Furthermore, the ratio of ethylene content to EPR content potentially reflects the ratio of long propylene segment-ethylene propylene block copolymer and long ethylene segment-ethylene propylene block copolymer. Long propylene segment-ethylene propylene block copolymer and long ethylene segment-ethylene propylene block copolymer are both by-products in the in-situ polymerization process of producing IPC. Long propylene segment-ethylene propylene block copolymer acts as a compatibilizer between PP and EPR, making the shape of EPR particles tend to be round, improving the efficiency of EPR; long ethylene segment-ethylene propylene block copolymer plays a role in increasing the diameter of EPR particles; reducing the ethylene / olefin ratio is conducive to the formation of long propylene segment-ethylene propylene block copolymer, which is not conducive to the formation of long ethylene segment-ethylene propylene block copolymer; on the contrary, it is conducive to the formation of long ethylene segment-ethylene propylene block copolymer, which is not conducive to the formation of long propylene segment-ethylene propylene block copolymer.

[0064] Furthermore, the IPP molecular weight and its distribution, and the EPR molecular weight and its distribution are important factors affecting the MFR of IPC; while the mass fractions of the long propylene segment-ethylene-propylene block copolymer and the long ethylene segment-ethylene-propylene block copolymer formed in the in-situ polymerization are not high, usually less than 1%, and their influence on the MFR of IPC can be ignored.

[0065] According to the present invention, in step (2), the main material 1 is selected based on the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are close to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the main material 1; preferably, the difference between the MFR of the competitive control and the MFR of the main material is 0-6.0 g / 10 min; the EPR content of the competitive control and the EP content of the main material are ... The difference in R content is 0-10%; the difference in IPP between the competitive control and the IPP of the main material is 0-10%; the difference in ethylene content between the competitive control and the ethylene content of the main material is 0-3.5%; the difference between the ratio of ethylene content to EPR content of the competitive control and the ratio of ethylene content to EPR content of the main material is 0-0.15; the difference in flexural modulus between the competitive control and the flexural modulus of the main material is 0-0.35GPa; the difference in impact strength between the competitive control and the impact strength of the main material is 0-15KJ / m2 .

[0066] In the present invention, the principle of "after the main ingredient and the auxiliary ingredient are combined, the IPP content of the simulated new product is the same as or close to the IPP content of the competitive control" is followed. The amount of main ingredient and auxiliary ingredient added is calculated.

[0067]

[0068] In the formula, IPP 主料 ——IPP content of main ingredients, %;

[0069] IPP 辅料1 ——IPP content of auxiliary material 1, %;

[0070] IPP 辅料2 ——IPP content of auxiliary material 2, %;

[0071] IPP 竞争对照物 ——IPP content of competitive control, %;

[0072] W%——the total amount of auxiliary material 1 and auxiliary material 2, %;

[0073] m——the addition ratio of auxiliary material 1 between auxiliary material 1 and auxiliary material 2;

[0074] n——the addition ratio of auxiliary material 2 between auxiliary material 1 and auxiliary material 2.

[0075] After sorting, rewrite it into:

[0076]

[0077] The amount of main material added is 100%-W%.

[0078] According to the present invention, in step (3), auxiliary material 1 and / or auxiliary material 2 are selected: preferably, the difference between the MFR of the competitive control and the MFR of the auxiliary material 1 is 0-50g / 10min; the difference between the EPR content of the competitive control and the EPR content of the auxiliary material 1 is 0-30%; the difference between the IPP of the competitive control and the IPP of the auxiliary material 1 is 0-30%; the difference between the ethylene content of the competitive control and the ethylene content of the auxiliary material 1 is 0-15%; the difference between the ratio of the ethylene content to the EPR content of the competitive control and the ratio of the ethylene content to the EPR content of the auxiliary material 1 is 0-0.5; the difference between the flexural modulus of the competitive control and the flexural modulus of the auxiliary material 1 is 0-1GPa; the difference between the impact strength of the competitive control and the impact strength of the auxiliary material 1 is 0-100KJ / m 2 .

[0079] According to the present invention, preferably, the difference between the MFR of the competitive control and the MFR of the auxiliary material 2 is 0-100g / 10min; the difference between the EPR content of the competitive control and the EPR content of the auxiliary material 2 is 0-30%; the difference between the IPP of the competitive control and the IPP of the auxiliary material 2 is 0-30%%; the difference between the ethylene content of the competitive control and the ethylene content of the auxiliary material 2 is 0-15%; the difference between the ratio of the ethylene content to the EPR content of the competitive control and the ratio of the ethylene content to the EPR content of the auxiliary material 2 is 0-0.5; the difference between the flexural modulus of the competitive control and the flexural modulus of the auxiliary material 2 is 0-1GPa; the difference between the impact strength of the competitive control and the impact strength of the auxiliary material 2 is 0-100KJ / m 2 .

[0080] According to the present invention, when there are differences between the main material 1 (IPC-1) and the competitive control in MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength, the flexural modulus or impact strength can be improved by adding a certain amount of auxiliary material 1 (IPC-2) and / or auxiliary material 2 (IPC-3). Preferably, m:n=(1-5):(1-5); preferably, m:n=(1-3):(1-3); more preferably, the addition ratio of auxiliary material 1 (IPC-2) to auxiliary material 2 (IPC-3) is set to m:n, wherein m is the addition ratio of auxiliary material 1 and n is the addition ratio of auxiliary material 2; when m:n=1:1, the addition ratio of auxiliary material 1 (IPC-2): auxiliary material 2 (IPC-3) is 1; 1; when m:n=2:3, the addition ratio of auxiliary material 1 (IPC-2): auxiliary material 2 (IPC-3) is 2:3; when m:n=3:2, the addition ratio of auxiliary material 1 (IPC-2): auxiliary material 2 (IPC-3) is 3:2; and the like is recommended; the ratio of m:n depends on the characteristics of the two auxiliary materials, and preferably m:n=1:1.

[0081] According to the present invention, the differences in IPP content, ratio of ethylene content to EPR content, flexural modulus and impact strength between the simulated new product and the competitive control satisfy: the absolute deviation of the IPP content is ±1.5%; the absolute deviation of the ratio of ethylene content to EPR content is ±0.08.

[0082] According to the present invention, in order to avoid the situation where a large deviation in MFR, IPP content and EPR content occurs between the simulated new product and the competitive control, W% can be slightly adjusted so that W 调整后The difference between % and W% is ±15%. And, at the same time, it is ensured that the absolute deviation of MFR between the simulated new product and the competitive control is ±1.5 g / 10 min, the absolute deviation of EPR content is ±1.5%, and the absolute deviation of ethylene content is ±1.5%.

[0083] According to the present invention, using 13 Compared with traditional methods, such as solvent distillation method and solid nuclear magnetic method, the IPP content is measured by small nuclear magnetic resonance calibrated by C-NMR. The detection process of this method is convenient and the detection time is shortened to 35-40 minutes. 13 The small nuclear magnetic resonance (NMR) for C-NMR calibration was purchased from Oxford Instruments, UK, model MQC+.

[0084] According to the present invention, the MFR is measured according to ISO 1133 (2.16 Kg, 230° C.).

[0085] According to the present invention, using 13 C-NMR calibrated Fourier transform infrared spectroscopy (FTIR) to measure ethylene content; in the present invention, 13 The Fourier exchange infrared spectrophotometer calibrated with C-NMR was purchased from Agilent, USA, model Cary660.

[0086] According to the present invention, using 13 C-NMR calibrated small NMR to measure EPR content.

[0087] According to the present invention, the flexural modulus is measured according to ISO 178:2019.

[0088] According to the present invention, the impact strength is measured according to ISO 179-1:2010.

[0089] According to the present invention, the ratio of ethylene content / EPR content is calculated based on the ethylene content and the EPR content.

[0090] According to the present invention, in step (7), the main materials and auxiliary materials such as IPC or PP homopolymer are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulation and drying steps are performed to obtain the IPC composition, and the quality index is tested. In addition, in the present invention, a twin-screw extruder of model ZSE 40 purchased from Leistritz, Germany is used. The cooling and drying conditions are not particularly limited and can be conventionally selected by those skilled in the art.

[0091] According to the present invention, in step (7), the melting conditions include: melting at a temperature of 190-290°C.

[0092] The second aspect of the present invention provides an impact-resistant copolymer polypropylene prepared by the above-mentioned preparation method.

[0093] According to the present invention, the melt flow rate MFR of the impact copolymer polypropylene is 1-150 g / 10 min, preferably 10-100 g / 10 min.

[0094] According to the present invention, the IPP content of the impact-resistant copolymer polypropylene is 60-99%, preferably 75-85%.

[0095] According to the present invention, the EPR content of the impact-resistant copolymer polypropylene is 0-40%, preferably 10-30%.

[0096] According to the present invention, the ratio of ethylene content to EPR content of the impact copolymer polypropylene is 0.2-0.6, preferably 0.33-0.48.

[0097] The present invention will be described in detail below through examples.

[0098] In the following embodiments:

[0099] The MFR parameters are measured by ISO1133 (2.16Kg, 230℃) method; the IPP content parameters are measured by the small nuclear magnetic method calibrated with 13C-NMR; the EPR content parameters are measured by the small nuclear magnetic method calibrated with 13C-NMR; the ethylene content parameters are measured by the Fourier exchange infrared spectroscopy (FTIR) method calibrated with 13C-NMR; the flexural modulus parameters are measured by ISO178:2019 method; the impact strength parameters are measured by ISO179-1:2010 method; the ethylene content / EPR content ratio parameters are measured by calculating the ethylene content and the EPR content.

[0100] Example 1

[0101] The following components were used in the examples:

[0102] (1) Competitive control 1: a commercial heterophasic copolymer with MFR of 30.1 g / 10 min, EPR content of 20%, IPP content of 77.7%, and ethylene content of 8.9%;

[0103] IPC1-1: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 32.8 g / 10 min, an EPR content of 17.8%, an IPP content of 80.5%, and an ethylene content of 8.6%;

[0104] IPC1-2: Heterophasic copolymer produced with Ziegler-Natta catalyst, MFR 15.9 g / 10 min, EPR content 25.1%, IPP content 72.4%, ethylene content 9.9%;

[0105] (2) The MFR of IPC1-1 is close to that of competitive control 1, so it is used as the main ingredient;

[0106] (3) IPC1-2 has a lower IPP content but a relatively higher EPR content, which is used to improve the impact strength of the product. Since the effect can be achieved by using only one auxiliary material, the second auxiliary material is not used in this example.

[0107] (4) The MFR, flexural modulus and impact strength of competitive control 1, IPC1-1 and IPC1-2 were measured according to ISO1133 (230°C, 2.16 kg), ISO178:2019 and ISO 179-1:2010 respectively;

[0108] use 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content to EPR content of the sample was calculated;

[0109] According to formula (a), Among them, the auxiliary material 2 can be omitted, and the IPP content of IPC1-1, IPC1-2 and competitive control 1 can be calculated.

[0110] (5) According to formula (b), formula (c) to formula (d), respectively, combined with the MFR, EPR content and ethylene content of the main material and the auxiliary material, the MFR, EPR content and ethylene content of the simulated new product 1 are calculated:

[0111] The MFR of simulated new product 1 = 32.8 g / 10min × (100% - 34.6%) + 15.9 g / 10min × 34.6% = 27.0 g / 10min. The difference between the MFR of simulated new product 1 and that of competitive control 1 is 3.1 g / 10min, which exceeds 1.5 g / 10min. Therefore, W% needs to be adjusted.

[0112] The EPR content of simulated new product 1 = 17.8% × (100% - 34.6%) + 25.1% × 34.6% = 20.3%, which is close to the EPR content of competitive control 1;

[0113] The ethylene content of the simulated new product 1 = 8.6% × (100% - 34.6%) + 9.9% × 34.6% = 9.0%, which is close to the ethylene content of the competitive control 1.

[0114] (6) After multiple measurements, W 调整后After adjusting % to 24%, the MFR difference between the simulated new product 1 and the competitive control 1 is 1.4g / 10min, the IPP content difference is 0.9%, the EPR content difference is 0.5%, and the ethylene content difference is 0%, which meets the conditions defined in the present invention. Finally, W is determined 调整后 % is 24%, see Table 1;

[0115] (7) According to W 调整后 % is 24%, the main materials such as IPC or PP homopolymer and auxiliary materials are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulating and drying steps are performed to obtain the impact-resistant copolymer polypropylene 1.

[0116] (8) The MFR, impact strength and flexural modulus of the new product 1 were measured according to ISO1133 (230°C, 2.16Kg), ISO 179-1:2010 and ISO 178:2019, respectively. 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content was calculated; the results are shown in the test data in Table 1, which are in line with expectations.

[0117] Table 1

[0118]

[0119]

[0120] Example 2

[0121] The following components were used in the examples:

[0122] (1) Competitive Control 2: a commercial heterophasic copolymer with an MFR of 51.0 g / 10 min, an EPR content of 20.4%, an IPP content of 82.4%, and an ethylene content of 9.3%;

[0123] IPC2-1: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 50.3 g / 10 min, an EPR content of 21.5%, an IPP content of 78.4%, and an ethylene content of 10.2%;

[0124] IPC2-2: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 9.8 g / 10 min, an EPR content of 8.6%, an IPP content of 92.1%, and an ethylene content of 2.8%;

[0125] IPC2-3: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 100.0 g / 10 min, an EPR content of 11.9%, an IPP content of 89.6%, and an ethylene content of 5.7%;

[0126] (2) The MFR of IPC2-1 is close to that of competitive control 2, so it is used as the main ingredient;

[0127] (3) IPC2-2 has a higher IPP content and is used to improve the flexural strength of the product. It is used as auxiliary material 1. IPC2-3 has a higher IPP content and is used to improve the flexural strength of the product. At the same time, the lower MFR of IPC2-2 is balanced, and m:n=1:1 is selected.

[0128] (4) The MFR, flexural modulus and impact strength of Competitive Control 2, IPC2-1, IPC2-2 and IPC2-3 were measured according to ISO1133 (230°C, 2.16 kg), ISO178:2019 and ISO179-1:2010, respectively.

[0129] use 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content of the sample was calculated.

[0130] According to formula (a), Combine the IPP contents of IPC2-1, IPC2-2, IPC2-3, and competition control 2, and calculate m:n = 1:1.

[0131] (5) According to formula (b), formula (c) to formula (d), respectively, combined with the MFR, EPR content and ethylene content of the main material and the auxiliary material, the MFR, EPR content and ethylene content of the simulated new product 2 are calculated:

[0132] The MFR of simulated new product 2 = 50.3 g / 10 min × (100% - 32.1%) + 54.9 g / 10 min × 32.1% = 51.8 g / 10 min. The difference between the MFR of simulated new product 2 and that of competitive control 2 is 0.8 g / 10 min, which is less than 1.5 g / 10 min. No adjustment of W% is required.

[0133] The EPR content of simulated new product 2 = 21.5% × (100% - 32.1%) + 10.3% × 32.1% = 17.9%, which is 2.5% different from the EPR content of competitive control 2, and W% needs to be adjusted;

[0134] The ethylene content of the simulated new product 2 = 10.2% × (100% - 32.1%) + 4.3% × 32.1% = 8.3%, which differs from the ethylene content of the competitive control 2 by 1.0%.

[0135] (6) After multiple measurements, W 调整后 After adjusting % to 20%, the MFR difference between the simulated new product 2 and the competitive control 2 is 0.2g / 10min, the IPP content difference is 1.5%, the EPR content difference is 1.2%, and the ethylene content difference is 0.3%, which meets the conditions defined in the present invention. Finally, W is determined 调整后 % is 20%, see Table 2;

[0136] (7) According to W 调整后 % is 20%, the main materials and auxiliary materials such as IPC or polypropylene homopolymer are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulating and drying steps are performed to obtain the impact-resistant copolymer polypropylene 2.

[0137] (8) The MFR, impact strength and flexural modulus of the new product 2 were measured according to ISO1133 (230°C, 2.16Kg), ISO 179-1:2010 and ISO 178:2019, respectively. 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content was calculated; the results are shown in the test data in Table 2, which are in line with expectations.

[0138] Table 2

[0139]

[0140] Example 3

[0141] The following components were used in the examples:

[0142] (1) Competitive control 3: a commercial heterophasic copolymer with MFR of 60.0 g / 10 min, EPR content of 12.8%, IPP content of 88.1%, and ethylene content of 4.6%;

[0143] IPC3-1: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 59.0 g / 10 min, an EPR content of 15.1%, an IPP content of 85.3%, and an ethylene content of 5.9%;

[0144] IPC3-2: homopolymer produced with Ziegler-Natta catalyst, MFR 61.5 g / 10 min, EPR content 0%, IPP content 98.5%, ethylene content 0%;

[0145] (2) The MFR of IPC3-1 is close to that of competitive control 3, but IPC3-1 has a lower IPP content as the main ingredient;

[0146] (3) It is necessary to add the homopolymer IPC3-2 with corresponding MFR to increase the IPP content, thereby improving the flexural strength of the product.

[0147] (4) The MFR, flexural modulus and impact strength of competitive control 3, IPC3-1 and IPC3-2 polypropylene were measured according to ISO1133 (230°C, 2.16 kg), ISO178:2019 and ISO 179-1:2010, respectively;

[0148] use 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content of the sample was calculated.

[0149] According to formula (a), Among them, the auxiliary material 2 can be omitted, and the IPP content of IPC3-1, IPC3-2 and competitive control 3 can be calculated.

[0150] (5) According to formula (b), formula (c) to formula (d), respectively, combined with the MFR, EPR content and ethylene content of the main material and the auxiliary material, the MFR, EPR content and ethylene content of the simulated new product 3 are calculated:

[0151] The MFR of simulated new product 3 = 59.1 g / 10 min × (100% - 21.2%) + 61.5 g / 10 min × 21.2% = 59.5 g / 10 min. The difference between the MFR of simulated new product 3 and that of competitive control 3 is 0.5 g / 10 min, which is less than 1.5 g / 10 min. No adjustment of W% is required.

[0152] The EPR content of simulated new product 3 = 15.1% × (100% - 21.2%) + 0% × 21.2% = 11.9%, which is 0.9% lower than that of competitive control 3, which is not much difference;

[0153] The ethylene content of the simulated new product 3 = 5.9% × (100% - 21.2%) + 0% × 21.2% = 4.6%, which is the same as the ethylene content of the competitive control 3.

[0154] (6) To facilitate the preparation of ingredients, 调整后After adjusting % to 20%, the MFR difference between the simulated new product 3 and the competitive control 3 is 0.5g / 10min, the IPP content difference is 0.2%, the EPR content difference is 0.7%, and the ethylene content difference is 0.1%, which meets the conditions defined in the present invention. Finally, W is determined 调整后 % is 20%, see Table 3;

[0155] (7) According to W 调整后 % is 20%, the main materials and auxiliary materials such as IPC or polypropylene homopolymer are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulation and drying steps are performed to obtain the impact-resistant copolymer polypropylene 3.

[0156] (8) The MFR, impact strength and flexural modulus of the new product 3 were measured according to ISO1133 (230°C, 2.16Kg), ISO 179-1:2010 and ISO 178:2019, respectively. 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content was calculated; the results are shown in the test data in Table 3, which are in line with expectations.

[0157] Table 3

[0158]

[0159] Example 4

[0160] The following components were used in the examples:

[0161] (1) Competitive control 4: a commercial heterophasic copolymer. MFR is 24.7 g / 10 min, EPR content is 20.8%, IPP content is 77.3%, and ethylene content is 8.8%;

[0162] IPC4-1: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 30.4 g / 10 min, an EPR content of 22.8%, an IPP content of 75.2%, and an ethylene content of 8.4%;

[0163] IPC4-2: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 9.8 g / 10 min, an EPR content of 8.6%, an IPP content of 92.1%, and an ethylene content of 2.8%;

[0164] (2) IPC4-1 has a similar MFR to competitive control 4, but requires an increase in IPP content, i.e., the same MFR with a relatively high IPP content is used to improve the product flexural modulus.

[0165] (3) Since the effect can be achieved by using only one auxiliary material, the second auxiliary material is not used in this example.

[0166] (4) The MFR, flexural modulus and impact strength of competitive control 4, IPC4-1 and IPC4-2 polypropylene were measured according to ISO1133 (230°C, 2.16Kg), ISO178:2019 and ISO 179-1:2010, respectively.

[0167] use 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content of the sample was calculated.

[0168] According to formula (a), Among them, the auxiliary material 2 can be omitted, and the IPP content of IPC4-1, IPC4-2 and competitive control 4 can be calculated.

[0169] (5) According to formula (b), formula (c) to formula (d), respectively, combined with the MFR, EPR content and ethylene content of the main material and the auxiliary material, the MFR, EPR content and ethylene content of the simulated new product 4 are calculated:

[0170] The MFR of simulated new product 4 = 30.4 g / 10 min × (100% - 12.4%) + 9.8 g / 10 min × 12.4% = 27.8 g / 10 min. The difference between the MFR of simulated new product 4 and that of competitive control 4 is 3.1 g / 10 min, which is more than 1.5 g / 10 min. Therefore, W% needs to be adjusted.

[0171] The EPR content of simulated new product 4 = 22.8% × (100% - 12.4%) + 8.6% × 12.4% = 21.0%, which is close to the EPR content of competitive control 4;

[0172] The ethylene content of the simulated new product 4 = 8.4% × (100% - 12.4%) + 2.8% × 12.4% = 7.7%, which is 1.1% lower than that of the competitive control 4.

[0173] (6) After multiple measurements, W 调整后 After adjusting % to 20%, the MFR difference between the simulated new product 4 and the competitive control 4 is 1.4g / 10min, the IPP content difference is 1.3%, the EPR content difference is 0.8%, and the ethylene content difference is 1.5%, which meets the conditions defined in the present invention. Finally, W is determined 调整后 % is 20%, see Table 4;

[0174] (7) According to W 调整后 % is 20%, the main materials such as IPC or polypropylene homopolymer and auxiliary materials are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulation and drying steps are performed to obtain the impact-resistant copolymer polypropylene 4.

[0175] (8) The MFR, impact strength and flexural modulus of the new product 4 were measured according to ISO1133 (230°C, 2.16Kg), ISO 179-1:2010 and ISO 178:2019, respectively. 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content was calculated; the results are shown in the test data in Table 4, which are in line with expectations.

[0176] Table 4

[0177]

[0178] Example 5

[0179] The following components were used in the examples:

[0180] (1) Competitive Control 5: a commercial heterophasic copolymer with an MFR of 17.2 g / 10 min, an EPR content of 24.1%, an IPP content of 72.6%, and an ethylene content of 9.3%;

[0181] IPC5-1: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 17.2 g / 10 min, an EPR content of 29.2%, an IPP content of 66.3%, and an ethylene content of 10.2%;

[0182] IPC5-2: a heterophasic copolymer produced with a Ziegler-Natta catalyst, with an MFR of 9.8 g / 10 min, an EPR content of 8.6%, an IPP content of 92.1%, and an ethylene content of 2.8%;

[0183] IPC5-3: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 30.4 g / 10 min, an EPR content of 22.8%, an IPP content of 75.2%, and an ethylene content of 8.4%;

[0184] (2) The MFR of IPC5-1 is close to that of the competitive control 5. IPC5-2 has a lower IPP content and flexural modulus as the main material;

[0185] (3) IPC5-2 has a higher IPP content and is used to improve the flexural strength of the product. It is used as auxiliary material 1. IPC5-3 has a higher IPP content and is used to improve the flexural strength of the product. At the same time, the lower MFR of IPC5-2 is balanced, and m:n=1:1 is selected.

[0186] (4) The MFR, flexural modulus and impact strength of competitive control 5, IPC5-1 and IPC5-2 polypropylene were measured according to ISO1133 (230°C, 2.16 kg), ISO178:2019 and ISO179-1:2010, respectively.

[0187] use 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content of the sample was calculated.

[0188] According to formula (a), Combine the IPP contents of IPC5-1, IPC5-2, IPC5-3, and competitive control 5, and calculate m:n = 1:1.

[0189] (5) According to formula (b), formula (c) to formula (d), respectively, combined with the MFR, EPR content and ethylene content of the main material and the auxiliary material, the MFR, EPR content and ethylene content of the simulated new product 5 are calculated:

[0190] The MFR of the simulated new product 5 = 17.2 g / 10 min × (100% - 36.3%) + 20.1 g / 10 min × 36.3% = 18.3 g / 10 min. The difference between the MFR of the simulated new product 5 and the competitive control 5 is 1.1 g / 10 min, which is less than 1.5 g / 10 min. No adjustment of W% is required.

[0191] The EPR content of simulated new product 5 = 29.2% × (100% - 36.3%) + 15.7% × 36.3% = 24.3%, which is 0.2% different from the EPR content of competitive control 5, and no adjustment of W% is required;

[0192] The ethylene content of the simulated new product 5 = 10.2% × (100% - 36.3%) + 5.6% × 36.3% = 8.5%, which is 0.8% different from the ethylene content of the competitive control 5.

[0193] (6) After multiple measurements, W 调整后After adjusting % to 35%, the MFR difference between the simulated new product 5 and the competitive control 5 is 1.0g / 10min, the IPP content difference is 0.2%, the EPR content difference is 0.4%, and the ethylene content difference is 1.0%, which meets the conditions defined in the present invention. Finally, W is determined 调整后 % is 35%, see Table 5;

[0194] (7) According to W 调整后 % is 35%, the main materials such as IPC or polypropylene homopolymer and auxiliary materials are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulation and drying steps are performed to obtain the impact-resistant copolymer polypropylene 5.

[0195] (8) The MFR, impact strength and flexural modulus of the new product 5 were measured according to ISO1133 (230°C, 2.16Kg), ISO 179-1:2010 and ISO 178:2019, respectively. 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content was calculated; the results are shown in the test data in Table 5, which are in line with expectations.

[0196] Table 5

[0197]

[0198] Example 6

[0199] The following components were used in the examples:

[0200] (1) Competitive Control 6: a commercial heterophasic copolymer with an MFR of 30.0 g / 10 min, an EPR content of 27.1%, an IPP content of 69.7%, and an ethylene content of 10.1%;

[0201] IPC6-1: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 29.0 g / 10 min, an EPR content of 30.5%, an IPP content of 66.1%, and an ethylene content of 11.7%;

[0202] IPC6-2: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 9.8 g / 10 min, an EPR content of 8.6%, an IPP content of 92.1%, and an ethylene content of 2.8%;

[0203] IPC6-3: a heterophasic copolymer produced using a Ziegler-Natta catalyst, with an MFR of 100.0 g / 10 min, an EPR content of 11.9%, an IPP content of 89.6%, and an ethylene content of 5.7%;

[0204] (2) The MFR of IPC6-1 is close to that of the competitive control 6 and can be used as the main material, but the IPP content is insufficient and the flexural modulus is low;

[0205] (3) IPC6-2 has a higher IPP content and is used to improve the flexural strength of the product. It can be used as auxiliary material 1. IPC6-3 has a higher IPP content and is used to improve the flexural strength of the product. At the same time, it balances the lower MFR of IPC6-2. However, considering that the MFR of IPC6-3 is about 10 times that of IPC6-2, in order to reduce the amount of IPC6-3, m:n=4:1 is selected.

[0206] Experimental steps:

[0207] (4) The MFR, flexural modulus and impact strength of competitive control 6, IPC6-1, IPC6-2 and IPC6-3 were measured according to ISO1133 (230°C, 2.16Kg), ISO178:2019 and ISO179-1:2010, respectively.

[0208] use 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content of the sample was calculated.

[0209] According to formula (a), Combined with the IPP content of IPC6-1, IPC6-2, IPC6-3, and the competitive control 6, and m:n = 4:1, calculate

[0210] (5) According to formula (b), formula (c) to formula (d), respectively, combined with the MFR, EPR content and ethylene content of the main material and the auxiliary material, the MFR, EPR content and ethylene content of the simulated new product 6 are calculated:

[0211] The MFR of the simulated new product 6 = 29.0 g / 10 min × (100% - 14.1%) + 27.8 g / 10 min × 14.1% = 28.8 g / 10 min. The difference between the MFR of the simulated new product 6 and the competitive control 6 is 1.2 g / 10 min, which is less than 1.5 g / 10 min. No adjustment of W% is required.

[0212] The EPR content of simulated new product 6 = 30.5% × (100% - 14.1%) + 9.3% × 14.1% = 27.5%, which is 0.4% different from the EPR content of competitive control 6, and no adjustment of W% is required;

[0213] The ethylene content of the simulated new product 6 = 11.7% × (100% - 14.1%) + 3.4% × 14.1% = 10.5%, which differs from the ethylene content of the competitive control 6 by 0.1%.

[0214] (6) After multiple measurements, W 调整后 After adjusting % to 20%, the MFR difference between the simulated new product 6 and the competitive control 6 is 1.2g / 10min, the IPP content difference is 1.5%, the EPR content difference is 0.9%, and the ethylene content difference is 0.1%, which meets the conditions defined in the present invention. Finally, W is determined 调整后 % is 20%, see Table 6;

[0215] (7) According to W 调整后 % is 20%, the main materials and auxiliary materials such as IPC or polypropylene homopolymer are fed into a twin-screw extruder by weight and mixed at a temperature of 190-290° C.; and cooling, granulation and drying steps are performed to obtain the impact-resistant copolymer polypropylene 6.

[0216] (8) The MFR, impact strength and flexural modulus of the new product 6 were measured according to ISO1133 (230°C, 2.16Kg), ISO 179-1:2010 and ISO 178:2019, respectively. 13 C-NMR calibrated small nuclear magnetic, measure IPP content and EPR content; use 13 The ethylene content was measured by Fourier transform infrared spectroscopy (FTIR) calibrated with C-NMR; the ratio of ethylene content / EPR content was calculated; the results are shown in the test data in Table 6, which are in line with expectations.

[0217] Table 6

[0218]

[0219]

[0220] It can be seen from the above results that the preparation method of the present invention, including the use of 2-3 kinds of IPC or polypropylene to form a new combination, can achieve the purpose of improving the rigidity-toughness balance performance by mixing and granulating or (using) IPC resins and polypropylene resins with different IPP content and EPR content mass percentage, ethylene content mass percentage, and ratio of ethylene content to EPR content.

[0221] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for preparing impact-resistant copolymer polypropylene, It is characterized in that The preparation method comprises: (1) Testing the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control; (2) Selecting the main ingredient 1: selecting the main ingredient 1 based on the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are closest to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the main ingredient 1; (3) Selecting auxiliary material 1 and / or auxiliary material 2: selecting auxiliary material 1 and / or auxiliary material 2 according to the principle that the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of the competitive control are the second closest to the MFR, EPR content, IPP content, ethylene content, ratio of ethylene content to EPR content, flexural modulus and impact strength of auxiliary material 1 and / or auxiliary material 2, and the difference of the second closeness is greater than the difference of the first closeness; (4) Determining the amount of the main material 1, the auxiliary material 1 and / or the auxiliary material 2; wherein the content of the main material, the auxiliary material 1 and the auxiliary material 2 satisfies the formula shown in formula (a): Wherein, W% is the total amount of the auxiliary material 1 and the auxiliary material 2, %; IPP 主料 ——IPP content of the main ingredient, %; IPP 辅料1 ——IPP content of the auxiliary material 1, %; IPP 辅料2 ——IPP content of the auxiliary material 2, %; IPP 竞争对照物 ——IPP content of competitive control, %; m——the addition ratio of auxiliary material 1, n——the addition ratio of auxiliary material 2; m:n=(1-5):(0-5); The addition amount of the main material is 100%-W%; (5) Calculating the MFR, EPR content and ethylene content of the simulated new product according to equations (b), (c) to (d); (6) Adjustment of W%: The difference in MFR, EPR content and ethylene content between the simulated new product and the competitive control meets the following conditions: The absolute deviation of MFR is ±1.5g / 10min; and / or, the absolute deviation of EPR content is ±1.5%; and / or, the absolute deviation of ethylene content is ±1.5%; If the MFR, EPR content and ethylene content of the simulated new product and the competitive control meet the above conditions, there is no need to adjust W%; If the MFR, EPR content and ethylene content of the simulated new product and the competitive control do not meet the above conditions, it is necessary to adjust W% so that the adjusted W% 调整后 % meets the above conditions; (7) Based on W% or adjusted W 调整后 %, and the amount of the main material, the auxiliary material 1 and / or the auxiliary material 2 is calculated according to formula (b), formula (c) to formula (d), and the impact-resistant copolymer polypropylene is obtained through mixing, granulation or melt compounding.

2. The preparation method according to claim 1, in, The difference between the MFR of the competitive control and the MFR of the main ingredient is 0-6 g / 10 min; and / or, the difference between the EPR content of the competitive control and the EPR content of the main ingredient is 0-10%; and / or, the difference between the IPP of the competitive control and the IPP of the main ingredient is 0-10%; and / or, the difference between the ethylene content of the competitive control and the ethylene content of the main material is 0-3.5%; and / or, the difference between the ratio of the ethylene content to the EPR content of the competitive control and the ratio of the ethylene content to the EPR content of the main material is 0-0.15; and / or, the difference between the flexural modulus of the competitive control and the flexural modulus of the main material is 0-0.35 GPa; And / or, the difference between the impact strength of the competitive control and the impact strength of the main material is 0-15KJ / m 2 .

3. The preparation method according to claim 1 or 2, in, The difference between the MFR of the competitive control and the MFR of the auxiliary material 1 is 0-50 g / 10 min; and / or, the difference between the EPR content of the competitive control and the EPR content of the auxiliary material 1 is 0-30%; and / or, the difference between the IPP of the competitive control and the IPP of the excipient 1 is 0-30%; and / or, the difference between the ethylene content of the competitive control and the ethylene content of the auxiliary material 1 is 0-15%; and / or, the difference between the ratio of the ethylene content to the EPR content of the competitive control and the ratio of the ethylene content to the EPR content of the auxiliary material 1 is 0-0.5; and / or, the difference between the flexural modulus of the competitive control and the flexural modulus of the auxiliary material 1 is 0-1 GPa; And / or, the difference between the impact strength of the competitive control and the impact strength of the auxiliary material 1 is 0-100 KJ / m 2 .

4. The preparation method according to claim 1 or 2, in, The difference between the MFR of the competitive control and the MFR of the auxiliary material 2 is 0-100 g / 10 min; and / or, the difference between the EPR content of the competitive control and the EPR content of the auxiliary material 2 is 0-30%; and / or, the difference between the IPP of the competitive control and the IPP of the excipient 2 is 0-30%; and / or, the difference between the ethylene content of the competitive control and the ethylene content of the auxiliary material 2 is 0-15%; and / or, the difference between the ratio of the ethylene content to the EPR content of the competitive control and the ratio of the ethylene content to the EPR content of the auxiliary material 2 is 0-0.5; and / or, the difference between the flexural modulus of the competitive control and the flexural modulus of the auxiliary material 2 is 0-1 GPa; And / or, the difference between the impact strength of the competitive control and the impact strength of the auxiliary material 2 is 0-100 KJ / m 2 .

5. The preparation method according to any one of claims 1 to 4, in, m:n=(1-5):(1-5).

6. The preparation method according to claim 1, in, The difference between the IPP content, ethylene content and EPR content ratio of the simulated new product and the competitive control satisfies: and / or, the absolute deviation of IPP content is ±1.5%; and / or, the absolute deviation of the ratio of ethylene content to EPR content is ±0.08; and / or, W 调整后 The difference between % and W% is ±15%.

7. The preparation method according to any one of claims 1 to 6, in, use 13 C-NMR calibrated small NMR to measure IPP content; and / or, MFR measured at 2.16 kg, 230° C. in accordance with ISO 1133; and / or, using 13 Fourier transform infrared spectroscopy FTIR calibrated with C-NMR was used to measure the ethylene content; and / or, using 13 C-NMR calibrated small nuclear magnetic measurement EPR content; And / or, the flexural modulus parameters are measured according to ISO178:2019 method; And / or, the impact strength parameters are measured according to ISO179-1:2010 method.

8. The preparation method according to claim 1, in, In step (7), the mixing conditions include: mixing at a temperature of 190-290°C; And / or, in step (7), the melting conditions include: melting at a temperature of 190-290°C.

9. An impact-resistant copolymer polypropylene prepared by the preparation method according to any one of claims 1 to 8.

10. The impact-resistant copolymer polypropylene according to claim 9, in, The melt flow rate MFR of the impact copolymer polypropylene is 1-150g / 10min; And / or, the IPP content of the impact copolymer polypropylene is 60-99%; And / or, the EPR content of the impact-resistant copolymer polypropylene is 0-40%; And / or, the ratio of ethylene content to EPR content of the impact copolymer polypropylene is 0.2-0.6.

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