Polypropylene nucleating agent and polypropylene material and raw material composition, preparation method and application thereof

Abstract

The present application relates to the field of polypropylene materials, in particular to a kind of polypropylene nucleating agent and polypropylene material and raw material composition, preparation method and application.The structure of the polypropylene nucleating agent is polypropylene material prepared using the polypropylene nucleating agent and polypropylene material raw material composition provided by the present application, which has the advantages of excellent mechanical properties and light transmittance.

Description

Technical Field

[0001] This invention relates to the field of polypropylene materials, specifically to a polypropylene nucleating agent, polypropylene materials, their raw material compositions, preparation methods, and applications. Background Technology

[0002] Due to the influence of molecular weight, molecular weight distribution, structure, and density, the application of polypropylene as a mechanical material is limited. To improve the hardness and rigidity of polypropylene materials, polypropylene nucleating agents are being developed in this direction. Nucleating agents can regulate the crystallization behavior of polypropylene, reduce its linear thermal expansion coefficient and shrinkage rate, impart uniform shrinkage characteristics and good assemblability to components; refine the crystal size of polypropylene, improving its excellent balance of rigidity and toughness; accelerate polypropylene crystallization, and increase production speed and product performance. Currently, my country lacks a polypropylene nucleating agent that can improve the mechanical properties and light transmittance of polypropylene materials. The domestic market for polypropylene nucleating agents is experiencing a significant supply shortage, and the market remains heavily reliant on imported products. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems of poor mechanical properties and light transmittance of polypropylene materials in the prior art, and to provide a polypropylene nucleating agent, polypropylene materials, their raw material compositions, preparation methods, and applications. Polypropylene materials prepared using the polypropylene nucleating agent and polypropylene material raw material compositions provided by this invention have the advantages of excellent mechanical properties and light transmittance.

[0004] According to a first aspect of the present invention, the present invention provides a polypropylene nucleating agent, the structure of which is shown in formula (I):

[0005]

[0006] Wherein, M is selected from Group IIA and / or Group IIB metal cations; R1-R6 are each independently selected from one or more of the following: hydrogen atom, hydroxyl group, amino group, nitro group, halogen group, carboxyl group, cyano group, amide group, unsubstituted or substituted C1-C10 alkyl group, unsubstituted or substituted C1-C10 alkenyl group, unsubstituted or substituted phenyl group, unsubstituted or substituted 5-6 membered heterocyclic group, and unsubstituted or substituted C1-C10 chain group separated by at least one oxygen or sulfur atom.

[0007] According to a second aspect of the present invention, the present invention provides a polypropylene material raw material composition, the material comprising: polypropylene resin, the polypropylene nucleating agent described in the first aspect of the present invention, and optional additives, wherein the additives are selected from one or more of antioxidants, calcium stearate, monoglycerides, diglycerides, ultraviolet absorbers, light stabilizers, and hydrotalcite.

[0008] According to a third aspect of the present invention, the present invention provides a method for preparing a polypropylene material using the raw material composition described herein, the method comprising: melt-blending a polypropylene resin, a polypropylene nucleating agent, and optional additives to obtain a polypropylene material.

[0009] According to a fourth aspect of the present invention, the present invention provides a polypropylene material prepared by the preparation method described herein, the properties of which include: tensile yield modulus ≥34MPa; and / or flexural modulus ≥1600MPa; and / or notched impact strength of simply supported beam ≥4; and / or haze of 1mm thick sheet ≤50%; and / or clarity of 1mm thick sheet ≥95%.

[0010] According to a fifth aspect of the present invention, the present invention provides applications of the polypropylene material described herein in the automotive industry, food packaging, home appliances, electronic packaging, and building materials and home furnishings.

[0011] The polypropylene material provided by this invention has the advantages of high mechanical strength and good light transmittance. Detailed Implementation

[0012] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the invention. The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values; these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0013] This invention provides a polypropylene nucleating agent, the structure of which is shown in formula (I):

[0014]

[0015] Wherein, M is selected from Group IIA and / or Group IIB metal cations; R1-R6 are each independently selected from one or more of the following: hydrogen atom, hydroxyl group, amino group, nitro group, halogen group, carboxyl group, cyano group, amide group, unsubstituted or substituted C1-C10 alkyl group, unsubstituted or substituted C1-C10 alkenyl group, unsubstituted or substituted phenyl group, unsubstituted or substituted 5-6 membered heterocyclic group, and unsubstituted or substituted C1-C10 chain group separated by at least one oxygen or sulfur group, preferably selected from one or more of the following: hydrogen atom, hydroxyl group, amino group, halogen group, unsubstituted or substituted C1-C10 alkyl group, unsubstituted or substituted C1-C4 alkenyl group, unsubstituted or substituted phenyl group, and unsubstituted or substituted C1-C4 chain group separated by at least one oxygen or sulfur group.

[0016] Polypropylene nucleating agents with the aforementioned characteristics can improve the mechanical strength and light transmittance of polypropylene materials.

[0017] In this invention, there is no particular limitation on the way the C1-C10 alkyl groups are connected to the C atoms. For example, they can be straight chains, cyclic structures of C3-C10, branched chains, or combinations thereof (e.g., cyclic structures of C4-C10 with straight chains attached).

[0018] In this invention, the type of M is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, M is selected from Ca. 2+ Mg 2+ Zn 2+ or Cd 2+ .

[0019] In this invention, the types of substituent groups in the arbitrarily substituted C1-C10 alkyl groups are not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the substituent groups in the arbitrarily substituted C1-C10 alkyl groups are selected from one or more of hydroxyl, amino, nitro, halogen, carboxyl, and alkoxy groups.

[0020] In this invention, the types of substituent groups in the arbitrarily substituted C1-C10 alkenyl groups are not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the substituent groups in the arbitrarily substituted C1-C10 alkenyl groups are selected from one or more of hydroxyl, amino, nitro, halogen, carboxyl, and alkoxy groups.

[0021] In this invention, the types of substituents in the arbitrarily substituted C1-C4 alkenyl groups are not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the substituents in the arbitrarily substituted C1-C4 alkenyl groups are selected from one or more of hydroxyl, amino, nitro, halogen, carboxyl, and alkoxy groups.

[0022] In this invention, the type of substituent group in the C1-C10 chain group separated by at least one oxygen or sulfur group that is arbitrarily substituted is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of the invention, the substituent group in the C1-C10 chain group that is arbitrarily substituted and separated by at least one oxygen or sulfur group is selected from one or more of hydroxyl, amino, nitro, halogen, carboxyl, and alkoxy groups.

[0023] In this invention, the type of substituent group in the C1-C4 chain group separated by at least one oxygen or sulfur group that is arbitrarily substituted is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of the invention, the substituent group in the C1-C4 chain group that is arbitrarily substituted and separated by at least one oxygen or sulfur group is selected from one or more of hydroxyl, amino, nitro, halogen, carboxyl, and alkoxy groups.

[0024] In this invention, the type of substituent group in the arbitrarily substituted phenyl group is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the substituent group in the arbitrarily substituted phenyl group is selected from one or more of hydroxyl, amino, nitro, carboxyl, alkoxy, C1-C10 alkyl, and C1-C10 cycloalkyl groups.

[0025] In this invention, the types of substituents in the arbitrarily substituted 5-6 membered heterocyclic groups are not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the substituents in the arbitrarily substituted 5-6 membered heterocyclic groups are selected from C1-C10 alkyl groups.

[0026] In this invention, the type of nucleating agent is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the nucleating agent is selected from...

[0027] One or more of them.

[0028] Polypropylene nucleating agents possessing the aforementioned characteristics can all achieve the objectives of this invention. There are no special requirements for the preparation method of the nucleating agent; the following is an illustrative description, but it does not limit the scope of the invention. For example, a method for preparing a polypropylene nucleating agent includes: in a solvent, placing a material with the structural formula shown below... and / or The nucleating agent substrate shown reacts with the metal oxide MO x And / or metal hydroxides M(OH) y Contact reaction.

[0029] In the polypropylene nucleating agent preparation method of this invention, the type of solvent is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the solvent is selected from one or more of methanol, ethanol, diethyl ether, petroleum ether, n-hexane, cyclohexane, acetone, tetrahydrofuran, chloroform, dichloromethane, and deionized water.

[0030] In the polypropylene nucleating agent preparation method of this invention, the contact reaction temperature can be selected over a wide range. The following is an illustrative description, but it does not limit the scope of this invention. According to a preferred embodiment of the invention, the contact reaction temperature is 30-150°C.

[0031] In the polypropylene nucleating agent preparation method of the present invention, the contact reaction time can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the contact reaction time is 1-24 hours.

[0032] In the polypropylene nucleating agent preparation method of the present invention, the amount of nucleating agent substrate and the ratio of the total amount of metal oxide to metal hydroxide can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the molar amount of nucleating agent substrate and the ratio of the total molar amount of metal oxide to metal hydroxide are 0.3-3:1.

[0033] In the polypropylene nucleating agent preparation method of the present invention, the amount of solvent can be selected from a wide range. The following is an illustrative description, but it does not limit the scope of the present invention. According to a preferred embodiment of the present invention, the ratio of the volume of the solvent to the total molar amount of the nucleating agent substrate, metal oxide and metal hydroxide is 30-2000 mL:1 mol.

[0034] This invention provides a polypropylene material raw material composition, the material comprising: polypropylene resin, the polypropylene nucleating agent described in this invention, and optional additives, wherein the additives can be any optional functional additives, for example, the additives are selected from one or more of antioxidants, calcium stearate, monoglycerides, diglycerides, ultraviolet absorbers, light stabilizers, and hydrotalcite, preferably antioxidants and calcium stearate.

[0035] In this invention, the content of the polypropylene nucleating agent in the raw material composition can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the content of the polypropylene nucleating agent is 0.02-1 wt% based on the mass of the polypropylene resin, for example, it can be 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.5 wt%, 0.7 wt%, or 0.9 wt%.

[0036] In this invention, the content of additives in the raw material composition can be selected within a wide range. The following is an illustrative example, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the content of additives, based on the mass of polypropylene resin, is 0.002-2.5 wt%, for example, 0.1 wt%, 0.4 wt%, 0.7 wt%, 1 wt%, 1.3 wt%, 1.6 wt%, 1.9 wt%, or 2.2 wt%.

[0037] In this invention, the content of antioxidant in the raw material composition can be selected within a wide range. The following is an illustrative example, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the content of antioxidant, based on the mass of polypropylene resin, is 0.001-2 wt%, for example, 0.1 wt%, 0.4 wt%, 0.7 wt%, 1 wt%, 1.3 wt%, 1.6 wt%, or 1.9 wt%.

[0038] In this invention, the content of calcium stearate in the raw material composition can be selected within a wide range. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the content of calcium stearate is 0.001-0.5 wt% based on the mass of polypropylene resin, for example, it can be 0.05 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, or 0.4 wt%.

[0039] In this invention, the type of antioxidant in the raw material composition is not particularly limited; any suitable type can be selected as long as it can achieve the purpose of this invention. According to a preferred embodiment of this invention, the antioxidant is selected from one or more of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris[2,4-di-tert-butylphenyl]phosphite, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine.

[0040] In this invention, the type of polypropylene resin in the raw material composition is not particularly limited; any suitable type can be selected as long as it achieves the purpose of this invention. According to a preferred embodiment of this invention, the polypropylene resin is selected from one or more of homopolymer polypropylene, copolymer polypropylene, and long-chain branched polypropylene, preferably homopolymer polypropylene.

[0041] In this invention, the weight-average molecular weight of the polypropylene resin in the raw material composition can be selected from a wide range. The following is an illustrative example, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the weight-average molecular weight of the polypropylene resin is 2-400,000 g / mol.

[0042] In this invention, the melt index of the polypropylene resin in the raw material composition can be selected within a wide range. The following is an illustrative example, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, at 230°C and a load of 2.16 kg, the melt index of the polypropylene resin is 5-70 g / 10 min.

[0043] This invention provides a method for preparing polypropylene material using the raw material composition described in this invention. The method includes: melt-blending polypropylene resin, polypropylene nucleating agent, and optional additives to obtain polypropylene material.

[0044] In this invention, the melt blending temperature can be selected within a wide range in the preparation method. The following is an illustrative description, but it does not limit the scope of the invention. According to a preferred embodiment of the invention, the melt blending temperature is 160-280°C, preferably 200-270°C.

[0045] In this invention, in order to make the melt blending more uniform, the raw material composition can be mixed in a high-speed mixer before melt blending.

[0046] In this invention, the equipment used for melt blending in the preparation method is not specifically limited, and those skilled in the art can select it as needed. For example, a screw extruder can be used for melt blending.

[0047] The present invention provides a polypropylene material prepared by the preparation method described herein, wherein the tensile yield modulus of the polypropylene material is ≥34MPa.

[0048] The present invention provides a polypropylene material prepared by the preparation method described herein, wherein the flexural modulus of the polypropylene material is ≥1600MPa.

[0049] This invention provides a polypropylene material prepared by the method described herein, wherein the notched impact strength of the simply supported beam of the polypropylene material is ≥1.9 kJ / m. 2 .

[0050] The present invention provides a polypropylene material prepared by the preparation method described herein, wherein the haze of a 1 mm thick sheet of the polypropylene material is ≤50%.

[0051] The present invention provides a polypropylene material prepared by the preparation method described herein, wherein the clarity of a 1 mm thick sheet of the polypropylene material is ≥95%.

[0052] The polypropylene material described in this invention is particularly suitable for applications in the automotive industry, food packaging, home appliances, electronic packaging, and building materials and home furnishings.

[0053] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

[0054] The present invention will be described in detail below through embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art can make some non-essential improvements and adjustments to the present invention based on the above description.

[0055] For any experimental steps or conditions not specified in the examples and comparative examples, the procedures or conditions described in the literature in this field can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0056] In the examples and comparative examples:

[0057] Preparation method of polypropylene nucleating agent: Add 150 mL of water to 0.05 mol of nucleating agent substrate (R1-R6 is the same as polypropylene nucleating agent) and 0.05 mol of metal hydroxide (M is the same as polypropylene nucleating agent). After reacting at 80℃ for 6 h, stop the reaction, filter, dry, and pulverize to obtain polypropylene nucleating agent.

[0058] The tensile yield modulus was determined using a ZwickRoell 005 universal tester according to the method described in the national standard GB / T1040.1-2018.

[0059] The flexural modulus was measured using a ZwickRoell 005 universal testing instrument according to the method described in the national standard GB / T9341-2008.

[0060] The notched impact strength of the simply supported beam was determined using a CEAST 7611 pendulum impact tester according to the method specified in the national standard GB / T1043.1-2008.

[0061] Haze and clarity were measured using the Haze-gard Plus transmission haze imager from BYK GmbH, Germany, according to the method specified in the national standard GB / T2410-2008.

[0062] Table 1 shows the mechanical strength and light transmittance of the examples and comparative examples.

[0063] Example 1

[0064] 10 kg of polypropylene homopolymer (brand name M60T, weight average molecular weight of 130,000 g / mol, melt index of 60 g / 10 min at 230℃ and 2.16 kg load) and 4 g of polypropylene nucleating agent were mixed. 12g of antioxidant (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]) and 3g of calcium stearate were thoroughly mixed in a high-speed mixer and then added to a screw extruder for melt blending and extrusion at 220°C.

[0065] After extrusion, the granules are collected and injection molded to obtain test standard strips and 1mm samples of polypropylene products. The injection temperature is 220℃. After injection molding, the samples are stored in a constant temperature and humidity environment for 48 hours before testing.

[0066] Example 2

[0067] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0068] Example 3

[0069] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0070] Example 4

[0071] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0072] Example 5

[0073] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0074] Example 6

[0075] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0076] Example 7

[0077] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0078] Example 8

[0079] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0080] Example 9

[0081] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0082] Example 10

[0083] The method is the same as in Example 1, except that the polypropylene nucleating agent is...

[0084] Example 11

[0085] The method is the same as in Example 1, except that the amount of polypropylene nucleating agent used is 1g.

[0086] Example 12

[0087] The method is the same as in Example 1, except that the antioxidant is β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol ester.

[0088] Example 13

[0089] The method is the same as in Example 1, except that calcium stearate is not added.

[0090] Example 14

[0091] The method is the same as in Example 1, except that the polypropylene homopolymer used is a polypropylene homopolymer with grade T30S, a weight-average molecular weight of 500,000 g / mol, and a melt index of 4 g / 10 min at 230°C and 2.16 kg load.

[0092] Example 15

[0093] The method of Example 1 was followed, except that the polypropylene homopolymer was replaced with a polypropylene copolymer (brand name M60ET, weight average molecular weight of 120,000 g / mol, melt index of 60 g / 10 min at 230°C and 2.16 kg load).

[0094] Example 16

[0095] The method is the same as in Example 1, except that the amount of polypropylene nucleating agent is 8g, the amount of antioxidant is 24g, and the amount of calcium stearate is 6g.

[0096] Example 17

[0097] The method is the same as in Example 1, except that the amount of polypropylene nucleating agent used is 120g.

[0098] Example 18

[0099] The method is the same as in Example 1, except that the melt blending temperature is 180°C.

[0100] Comparative Example 1

[0101] The method is the same as in Example 1, except that no polypropylene nucleating agent is added.

[0102] Table 1 Mechanical strength and light transmittance of the examples and comparative examples

[0103]

Claims

1. A polypropylene nucleating agent, characterized in that, The structure of the nucleating agent is shown in formula (I): in, M is selected from Group IIA and / or Group IIB metal cations; R1-R6 are each independently selected from one or more of the following: hydrogen atom, hydroxyl group, amino group, nitro group, halogen group, carboxyl group, cyano group, amide group, unsubstituted or substituted C1-C10 alkyl group, unsubstituted or substituted C1-C10 alkenyl group, unsubstituted or substituted phenyl group, unsubstituted or substituted 5-6 membered heterocyclic group, and unsubstituted or substituted C1-C10 chain group separated by at least one oxygen or sulfur atom.

2. The polypropylene nucleating agent according to claim 1, wherein, M is selected from Ca 2+ Mg 2+ Zn 2+ or Cd 2+ ; R1-R6 are each independently selected from one or more of the following: hydrogen atom, hydroxyl group, amino group, halogen, unsubstituted or substituted C1-C10 alkyl group, unsubstituted or substituted C1-C4 alkenyl group, unsubstituted or substituted phenyl group, and unsubstituted or substituted C1-C4 chain group separated by at least one oxygen or sulfur group. The substituent groups in the substituted C1-C10 alkyl group, the substituted C1-C10 alkenyl group, the substituted C1-C4 alkenyl group, the substituted C1-C10 chain group separated by at least one oxygen or sulfur group, and the unsubstituted or substituted C1-C4 chain group separated by at least one oxygen or sulfur group are each independently selected from one or more of hydroxyl, amino, nitro, halogen, carboxyl, and alkoxy groups. The substituent groups in the arbitrarily substituted phenyl group are selected from one or more of hydroxyl, amino, nitro, carboxyl, alkoxy, C1-C10 alkyl, and C1-C10 cycloalkyl groups; The substituent groups in the arbitrarily substituted 5-6 membered heterocyclic groups are selected from C1-C10 alkyl groups; Preferably, the nucleating agent is selected from... One or more of them.

3. A polypropylene material raw material composition, characterized in that, The material comprises: polypropylene resin, the polypropylene nucleating agent as described in claim 1 or 2, and optional additives, wherein the additives are selected from one or more of antioxidants, calcium stearate, monoglycerides, diglycerides, ultraviolet absorbers, light stabilizers, and hydrotalcite.

4. The raw material composition according to claim 3, wherein, Based on the mass of polypropylene resin, The polypropylene nucleating agent content is 0.02-1 wt%; and / or The content of additives is 0.002-2.5 wt%; Preferably, the adjuvants include antioxidants and calcium stearate; More preferably, based on the mass of polypropylene resin, Antioxidant content is 0.001-2 wt%; and / or The calcium stearate content is 0.001-0.5 wt%.

5. The raw material composition according to claim 3 or 4, wherein, The antioxidant is selected from one or more of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris[2,4-di-tert-butylphenyl]phosphite, octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, and 4,4'-bis(α,α'-dimethylbenzyl)diphenylamine.

6. The raw material composition according to any one of claims 3-5, wherein, The polypropylene resin is selected from one or more of homopolymer polypropylene, copolymer polypropylene, and long-chain branched polypropylene, preferably homopolymer polypropylene.

7. The raw material composition according to any one of claims 3-6, wherein, The weight-average molecular weight of polypropylene resin is 20,000-400,000 g / mol; and / or At 230℃ and 2.16kg load, the melt index of polypropylene resin is 5-70g / 10min.

8. A method for preparing a polypropylene material, characterized in that, The method comprises preparing a polypropylene material using the raw material composition according to any one of claims 3-7, wherein the method comprises: melt-blending a polypropylene resin, a polypropylene nucleating agent, and optional additives to obtain a polypropylene material; Preferably, the melt blending temperature is 160-280℃, and more preferably 200-270℃.

9. The polypropylene material prepared by the method according to claim 8, characterized in that, The properties of polypropylene materials include: Tensile yield modulus ≥ 34 MPa; and / or Flexural modulus ≥1600MPa; and / or Notched impact strength of simply supported beam ≥ 1.9 kJ / m 2 ; and / or The haze of a 1mm thick sheet is ≤50%; and / or The clarity of a 1mm thick film is ≥95%.

10. The application of the polypropylene material according to claim 9 in the automotive industry, food packaging, home appliances, electronic packaging, building materials and home furnishings.

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