Ionically modified molecular weight broad distribution polypropylene resin composition and method for making same

Abstract

This invention belongs to the field of polymer materials technology and discloses an ion-modified polypropylene resin composition with a wide molecular weight distribution and its preparation method. The resin composition contains polypropylene with a wide molecular weight distribution, organic acid / anhydride, organometallic salt, and functional additives. Based on 100 parts by weight of polypropylene with a wide molecular weight distribution, the content of the organic acid / anhydride is 0.1-3 parts by weight, the content of the organometallic salt is 0.1-2 parts by weight, and the content of the functional additives is 0.01-1 parts by weight. The ion-modified polypropylene resin composition of this invention exhibits reduced viscosity and increased melt strength, which is beneficial for its application in high-performance processing technologies requiring strong resin anti-sagging properties, such as foaming, blown film, and hollow fiber processes.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to an ion-modified polypropylene resin composition with a wide molecular weight distribution and its preparation method. Background Technology

[0002] Due to differences in molecular structure, polymers exhibit varying melt rheological properties under different temperature fields and processing flow fields, which significantly impacts processing conditions and product quality. Common polymer rheological property tests include using rotational rheology to characterize changes in apparent viscosity η* and shear modulus (G' storage modulus and G” loss modulus) under shear flow fields; using tensile rheology to examine whether polymers undergo tensile strain hardening under tensile flow fields; and using melt strength testing to evaluate the polymer melt's resistance to sag at different temperatures.

[0003] The most common way to improve the viscoelasticity and anti-sagging properties of PP is to increase its molecular weight. However, excessively large molecular weight segments can form severe entanglement in the melt, hindering molecular chain movement and increasing the processing difficulty of PP. To solve this problem, one approach is to control the catalyst system and polymerization process to adjust the molecular weight and its distribution of PP, producing wide molecular weight distribution PP (BMWDPP). Large molecular weight segments improve the viscoelasticity of PP, while small molecular weight segments improve its processability. Another approach is to process PP with long-branched chains (LCPP) through polymerization or reaction. The introduction of long branches can lead to tensile hardening, increasing the melt strength of the resin.

[0004] BMWDPP is easier to synthesize directly through polymerization than LCPP, but due to the presence of internal linear high molecular weight segments, its viscoelasticity is higher than that of LCPP, and its zero-shear viscosity at 210°C is typically around 10. 5 With a Pa·s order of magnitude, LCPP exhibits more sensitive resistance to sag due to temperature changes, and its processing performance is slightly inferior. The polymerization and reaction processing of LCPP are more challenging, as the formation of long-branched structures is highly random and difficult to stabilize and control. Furthermore, long-branched structures tend to increase the apparent viscosity η* and η0 of the resin, increasing processing energy consumption and difficulty. If BMWDPP can be modified to significantly reduce its apparent viscosity while simultaneously exhibiting tensile hardening due to non-long-branched structures, thereby improving its melt strength, it is expected to improve its viscoelasticity and processing performance, thus enabling better application in high-value-added processing technologies such as foaming, blown film molding, and blown film production. Summary of the Invention

[0005] In view of the above-mentioned problems in the existing technology, the purpose of this invention is to provide an ion-modified polypropylene resin composition with a wide molecular weight distribution and its preparation method. While improving the resin's processing capability, it also improves its melt strength, thereby simultaneously improving the resin's viscoelasticity and processing performance. This allows for better application in high-value-added processing technologies such as foaming, blow molding, and blown film.

[0006] A first aspect of the present invention provides an ion-modified polypropylene resin composition with a wide molecular weight distribution, the resin composition comprising polypropylene with a wide molecular weight distribution, an organic acid / anhydride, an organometallic salt, and functional additives.

[0007] Based on 100 parts by weight of polypropylene with a wide molecular weight distribution, the content of the organic acid / anhydride is 0.1 to 3 parts by weight, the content of the organometallic salt is 0.1 to 2 parts by weight, and the content of the functional additive is 0.01 to 1 part by weight.

[0008] A second aspect of the present invention provides a method for preparing the above-described ion-modified polypropylene resin composition with a wide molecular weight distribution, the method comprising:

[0009] 1) Polypropylene with a wide molecular weight distribution, organic acid / anhydride and organometallic salt are mixed and then extruded and granulated to obtain composite particles;

[0010] 2) After mixing the composition particles with the functional additives, the mixture is extruded and granulated to obtain the ion-modified polypropylene resin composition with a wide molecular weight distribution.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The ion-modified polypropylene resin composition of the present invention, while maintaining the characteristics of a wide molecular weight distribution, exhibits tensile hardening through ion modification.

[0013] 2. The η0 of the ion-modified polypropylene resin composition with a wide molecular weight distribution of the present invention is greatly reduced, thereby improving its flow properties and processing performance.

[0014] 3. The ion-modified polypropylene resin composition of the present invention with a wide molecular weight distribution reduces viscosity while increasing melt strength, which is beneficial for its application in high-resistance processing technologies such as foaming, blown film and hollow film.

[0015] 4. The preparation process of the ion-modified polypropylene resin composition with a wide molecular weight distribution of the present invention is simple and easy to promote.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 The n* comparison curves are for the polypropylene resin compositions obtained in Example 1 and Comparative Example 1.

[0018] Figure 2 The G' and G” curves of the polypropylene resin compositions obtained in Example 1 and Comparative Example 1 can be used to calculate η0.

[0019] Figure 3 The tensile strain curve is shown for the polypropylene resin composition obtained in Example 1.

[0020] Figure 4 The tensile strain curves are for the polypropylene resin composition obtained in Comparative Example 1.

[0021] Figure 5 Melt strength curves of the polypropylene resin compositions obtained in Example 1 and Comparative Example 1. Detailed Implementation

[0022] 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 scope of the invention.

[0023] According to a first aspect of the present invention, the present invention provides an ion-modified polypropylene resin composition with a wide molecular weight distribution, the resin composition comprising polypropylene with a wide molecular weight distribution, an organic acid / anhydride, an organometallic salt, and functional additives;

[0024] Based on 100 parts by weight of polypropylene with a wide molecular weight distribution, the content of the organic acid / anhydride is 0.1 to 3 parts by weight, the content of the organometallic salt is 0.1 to 2 parts by weight, and the content of the functional additive is 0.01 to 1 part by weight.

[0025] In this invention, the polypropylene raw material with a wide molecular weight distribution can be polypropylene with a molecular weight distribution ≥8, and the molecular weight distribution (PDI) is usually obtained by gel permeation chromatography (GPC).

[0026] According to the present invention, the wide molecular weight distribution polypropylene can be at least one selected from homopolymer polypropylene (such as the homopolymer wide molecular weight distribution polypropylene HMS20Z produced by Sinopec Zhenhai Refining & Chemical), ethylene-propylene random copolymer polypropylene (such as ethylene-propylene random copolymer polypropylene E02ES), propylene-butadiene random copolymer polypropylene, ternary random copolymer polypropylene, and impact copolymer polypropylene. The wide molecular weight distribution polypropylene can be prepared by melt blending, mixed catalyst method, multi-active-site catalytic polymerization method, stepwise polymerization method, or multi-zone circulating reactor method. The specific processes are well known to those skilled in the art and will not be described in detail here.

[0027] This invention adds a certain amount of organic acid / anhydride and organometallic salt to directly polymerized polypropylene with a wide molecular weight distribution. Through the effect of the mutual aggregation of particle cluster groups grafted on the polypropylene molecular chain, a "long-branch-like" structure is formed in the polypropylene, which can bring about a stretch hardening effect and reduce the shear viscosity of the resin.

[0028] In this invention, the organic acid / anhydride may be selected from at least one of maleic acid, maleic anhydride, citric acid, methacrylic acid, acrylic acid, phthalic acid, phthalic anhydride, terephthalic acid, terephthalic anhydride, isophthalic acid, and isophthalic anhydride.

[0029] According to the present invention, the organometal salt is a metal salt containing an acetyl group. Preferably, the organometal salt is selected from at least one of zinc acetylacetonate, aluminum acetylacetonate, copper acetylacetonate, cobalt acetylacetonate, and nickel acetylacetonate.

[0030] In this invention, the functional additive can be any of the functional additives commonly used in the art, for example, it can be selected from at least one of antioxidants, ultraviolet absorbers, antistatic agents, flame retardants, metal deactivators, pigments, nucleating agents, foam control agents, fillers, stabilizers, reinforcing agents and lubricants.

[0031] According to the present invention, the antioxidant can be any antioxidant conventionally used in the art. Preferably, the antioxidant is a mixture of hindered phenolic antioxidant and phosphite antioxidant in a mass ratio of 1 to 5: 5 to 1. The hindered phenolic antioxidant can be selected from antioxidant 1010, antioxidant 1076, antioxidant 245, or antioxidant 246; the phosphite antioxidant can be selected from triphenyl phosphate, trimethyl phosphate, or antioxidant 168.

[0032] In a preferred embodiment, based on 100 parts by weight of polypropylene with a wide molecular weight distribution, the content of the organic acid / anhydride is 0.5 to 1.5 parts by weight, the content of the organometallic salt is 0.3 to 1 part by weight, and the content of the functional additive is 0.03 to 0.5 parts by weight.

[0033] The ion-modified polypropylene resin composition of the present invention has a PDI ≥ 8.0, preferably ≥ 9.0, and η0 ≤ 8.0 × 10⁻⁶. 4 Pa·s, preferably ≤5.5×10 4 Pa·s, melt strength ≥0.20 N, preferably ≥0.22 N; compared with unmodified broad molecular weight polypropylene, the η0 of the ion-modified broad molecular weight polypropylene resin composition is reduced by 60%, preferably by 75%, η0 is η0 at 210 °C, melt strength is increased by 15%, preferably by 30%, tensile hardening occurs, and the melt strength is the melt strength measured at 210 °C according to the method provided in this invention.

[0034] According to a second aspect of the present invention, the present invention provides a method for preparing the above-described ion-modified polypropylene resin composition with a wide molecular weight distribution, the method comprising:

[0035] 1) Polypropylene with a wide molecular weight distribution, organic acid / anhydride and organometallic salt are mixed and then extruded and granulated to obtain composite particles;

[0036] 2) After mixing the composition particles with the functional additives, the mixture is extruded and granulated to obtain the ion-modified polypropylene resin composition with a wide molecular weight distribution.

[0037] In this invention, the mixing of materials can be accomplished using various mixing equipment available in the prior art, such as high-speed mixers and kneaders. Extrusion granulation can be performed in an extrusion molding machine, where the material is extruded into wire and cut using one or more dies of a twin-screw or single-screw extruder. The die temperature can be selected as needed. These are all conventional choices that those skilled in the art can make by referring to the prior art, and will not be elaborated upon here.

[0038] The substances and parameters not limited in this invention can be selected according to existing technology, which is a conventional technical means in this field.

[0039] The present invention will be further described below with reference to embodiments. However, the invention is not limited to these embodiments.

[0040] In the following embodiments and comparative examples, the raw materials and instruments used include:

[0041] Wide molecular weight distribution homopolymer polypropylene HMS20Z: Sinopec Zhenhai Refining & Chemical.

[0042] Wide molecular weight distribution ethylene-propylene copolymer polypropylene E02ES: Sinopec Zhenhai Refining & Chemical.

[0043] General-purpose homopolymer polypropylene T03: Sinopec Zhenhai Refining & Chemical.

[0044] Maleic anhydride: Bailingwei, analytical grade.

[0045] Acrylic acid: Bailingwei, analytical grade.

[0046] Zinc acetylacetone: Bailingwei, analytical grade.

[0047] Aluminum acetylacetone: Bailingwei, analytical grade.

[0048] 2,5-Dimethyl-2,5-bis(tert-butylperoxide)hexane (DMDBH): Bailingwei, analytical grade.

[0049] Pentaerythritol (PETA): Bailingwei, analytical grade.

[0050] Antioxidant 1010: BASF.

[0051] Antioxidant 168: BASF.

[0052] Twin-screw extruder ZE26: Krauss-Maffei GmbH, Germany.

[0053] PRIMO 60E Pelletizer: Magg GmbH, Germany.

[0054] Rotational rheometer MCR302: Anton Paar GmbH, Austria.

[0055] ARES-G2 tensile rheometer: TA Instruments, Inc., USA.

[0056] Waters-208 GPC gel chromatograph: Waters Corporation, USA.

[0057] RHEOTENS 71.97 Melt Tensile Rheometer: Gottfert GmbH, Germany.

[0058] In the following embodiments and comparative examples, the testing methods for the relevant data are as follows:

[0059] 1. η* of polypropylene resin composition: At 210℃, the shear rate range is 0.01-100 rad / s, and the strain value is 5%. The relationship curve between apparent viscosity η* and shear rate w is measured using a rotational rheometer. Usually, the value at which η* no longer increases with shear rate in the low-frequency region can be read as η0 of the polyolefin resin composition. However, due to the high η* of polypropylene with a wide molecular weight distribution, η0 cannot be read within the conventional testing range.

[0060] 2. Polypropylene resin composition η0: The viscosity of a fluid measured when the shear rate approaches zero is called zero shear viscosity (η0), which is closely related to the test temperature, molecular weight, and molecular weight distribution.

[0061] The different molecular weight distributions of polypropylene cause the storage modulus (G') and loss modulus (G'') to intersect at different frequencies. The modulus at the intersection of G' and G'' can be used to analyze the energy distribution. x The rheological polydispersity index PI is defined by the magnitude of G' = G”. That is, the formula:

[0062] PI=10 5 / G x

[0063] The zero-shear viscosity of polypropylene at a certain temperature can also be expressed using G. x The corresponding cutoff frequency ω x It is obtained by calculating PI. That is, the formula:

[0064] ln(η0ω x= 14.73 - 0.237lnPI

[0065] 3. PDI of the polypropylene resin composition: The relative molecular mass and distribution of the samples were determined by gel permeation chromatography (GPC). The solvent and mobile phase were both 1,2,4-trichlorobenzene (containing 0.025% antioxidant 2,6-dibutyl-p-cresol). The column temperature was set to 150℃, and the flow rate was set to 1.0 mL / min. Narrow-distribution polystyrene standards were used for universal calibration. The weight-average molecular weight (Mw) and number-average molecular weight (Mn) of the samples were measured, and the molecular distribution index (PDI) was obtained by dividing Mw by Mn.

[0066] 4. Tensile strain of polypropylene resin composition: The test temperature was set at 150℃, and the tensile rate was 0.01~3s. -1 The tensile strain value is 3. Observe whether tensile hardening occurs.

[0067] 5. Melt strength of polypropylene resin composition: The distance between the stretching rollers of the melt stretching rheometer was set to 4 mm, the distance between the vertical extrusion die and the center of the stretching roller was 60 mm, the screw speed was 5 r / min, and the rotational acceleration of the stretching roller was 20 m / s². 2 The tensile force measured when the melt bundle breaks is recorded as the melt strength, and the tensile relative speed (speed at break / initial tensile speed) is the draw ratio. The test samples are repeated 5 times and the average value is taken. The test is conducted at 210°C in the extrusion die.

[0068] Example 1

[0069] 100 parts by weight of HMS20Z were added to a twin-screw extruder in separate loss-in-weight containers with 1.2 parts by weight of maleic anhydride and 0.6 parts by weight of zinc acetylacetonate. The mixture was extruded and pelletized at a die temperature of 210°C to obtain granules. The granules were then mixed with antioxidants (0.2 parts by weight of antioxidant 1010 and 0.1 parts by weight of antioxidant 168, based on 100 parts by weight of HMS20Z in the granules) using a high-speed mixer. This mixture was then added to a twin-screw extruder and extruded and pelletized at a die temperature of 210°C. The pellets were dried to obtain an ion-modified polypropylene resin composition with a wide molecular weight distribution. The η0, PDI, tensile strain, and melt strength are shown in Table 1. Figure 1 , 2 3, 5.

[0070] Example 2

[0071] Same as Example 1, except that zinc acetylacetonate was replaced with aluminum acetylacetonate. The η0, PDI, tensile strain, and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0072] Example 3

[0073] Same as Example 1, except that maleic anhydride was replaced with acrylic acid. The η0, PDI, tensile strain, and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0074] Example 4

[0075] Same as Example 1, except that the amount of maleic anhydride was changed from 1.2 parts by weight to 1.8 parts by weight, and the amount of zinc acetylacetonate was changed from 0.6 parts by weight to 0.9 parts by weight. The η0, PDI, tensile strain and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0076] Example 5

[0077] Same as Example 1, except that the amount of maleic anhydride was changed from 1.2 parts by weight to 0.6 parts by weight, and the amount of zinc acetylacetone was changed from 0.6 parts by weight to 0.3 parts by weight. The η0, PDI, tensile strain and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0078] Example 6

[0079] Same as Example 1, except that the amount of maleic anhydride was changed from 1.2 parts by weight to 0.2 parts by weight, and the amount of zinc acetylacetonate was changed from 0.6 parts by weight to 1.6 parts by weight. The η0, PDI, tensile strain and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0080] Example 7

[0081] Same as Example 1, except that the amount of maleic anhydride was changed from 1.2 parts by weight to 1.65 parts by weight, and the amount of zinc acetylacetone was changed from 0.6 parts by weight to 0.15 parts by weight. The η0, PDI, tensile strain and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0082] Example 8

[0083] Same as Example 1, except that HMS20Z was replaced with E02ES. The η0, PDI, tensile strain and melt strength of the obtained ion-modified polypropylene resin composition with a wide molecular weight distribution are shown in Table 1.

[0084] Comparative Example 1

[0085] 100 parts by weight of HMS20Z, 0.2 parts by weight of antioxidant 1010, and 0.1 parts by weight of antioxidant 168 were mixed evenly in a high-speed mixer, and then fed into a twin-screw extruder. The mixture was extruded and pelletized at a die temperature of 210°C. The resulting polypropylene resin composition was dried. Its η0, PDI, tensile strain, and melt strength are shown in Table 1. Figure 1 , 2 4, 5.

[0086] Comparative Example 2

[0087] Similar to Comparative Example 1, except that HMS20Z was replaced with E02ES. The η0, PDI, tensile strain, and melt strength of the obtained polypropylene resin composition are shown in Table 1.

[0088] Comparative Example 3

[0089] Same as Example 1, except that 1.2 parts by weight of maleic anhydride were replaced with 0.1 parts by weight of DMDB peroxide, and 0.6 parts by weight of zinc acetylacetonate were replaced with 2.0 parts by weight of PETA. A long-branched modified polypropylene resin composition with a wide molecular weight distribution was obtained, and its η0, PDI, tensile strain, and melt strength are shown in Table 1.

[0090] Comparative Example 4

[0091] Similar to Comparative Example 3, except that PETA was not added. A polypropylene resin composition with a wide molecular weight distribution was obtained, and its η0, PDI, tensile strain and melt strength are shown in Table 1.

[0092] Comparative Example 5

[0093] Same as Example 1, except that the amount of maleic anhydride was changed from 1.2 parts by weight to 0.08 parts by weight, and the amount of zinc acetylacetonate was changed from 0.6 parts by weight to 0.08 parts by weight. The η0, PDI, tensile strain and melt strength of the obtained polypropylene resin composition are shown in Table 1.

[0094] Comparative Example 6

[0095] Same as Example 1, except that the amount of maleic anhydride was changed from 1.2 parts by weight to 3.3 parts by weight, and the amount of zinc acetylacetonate was changed from 0.6 parts by weight to 2.2 parts by weight. As a result, granulation could not be successfully completed.

[0096] Comparative Example 7

[0097] Similar to Comparative Example 1, except that HMS20Z was replaced with T03. The η0, PDI, tensile strain, and melt strength of the obtained polypropylene resin composition are shown in Table 1.

[0098] Comparative Example 8

[0099] Same as Example 1, except that HMS20Z was replaced with T03. The η0, PDI, tensile strain and melt strength of the obtained polypropylene resin composition are shown in Table 1.

[0100] Table 1

[0101]

[0102]

[0103] As can be seen from the results of Examples 1-3 and 8 and Comparative Examples 1 and 2 in Table 1, different types of organic acids / anhydrides and organometallic salts can all play an ionic modification role on homopolymer or copolymer polypropylene with a wide molecular weight distribution. While significantly reducing the η0 of the resin composition, tensile hardening occurs and the melt strength is improved under the same test conditions.

[0104] As can be seen from Examples 4-7 and Comparative Examples 5-6, within a certain range, changing the amount and ratio of organic acids / anhydrides and organometallic salts can still significantly reduce the η0 of the resin composition for polypropylene with a wide molecular weight distribution, while simultaneously causing tensile hardening and increasing melt strength under the same test conditions. However, beyond the scope of this invention, adding too little will not reduce η0, while adding too much will lead to a decrease in melt strength.

[0105] As shown in Comparative Example 3, while long-branched polypropylene with a wide molecular weight distribution can produce tensile hardening and increase melt strength, η0 also increases accordingly. As shown in Comparative Example 4, while degraded polypropylene with a wide molecular weight distribution can reduce η0, it does not produce tensile hardening, and the melt strength is also significantly reduced.

[0106] As can be seen from the results of Comparative Examples 7 and 8, ion modification of linear polypropylene will also produce tensile hardening, but η0 will increase, and although the melt strength is improved, it is still relatively low.

[0107] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An ionically modified molecular weight broad distribution polypropylene resin composition characterized in that, The resin composition contains polypropylene with a wide molecular weight distribution, organic acids / anhydrides, organometallic salts, and functional additives; Based on 100 parts by weight of polypropylene with a wide molecular weight distribution, the content of the organic acid / anhydride is 0.1 to 3 parts by weight, the content of the organometallic salt is 0.1 to 2 parts by weight, and the content of the functional additive is 0.01 to 1 part by weight. The molecular weight distribution of the polypropylene with a wide molecular weight distribution is ≥8; The method for preparing the resin composition includes: mixing polypropylene with a wide molecular weight distribution, organic acid / anhydride and organometallic salt, and then extruding and granulating to obtain composition particles; The composition particles are mixed with functional additives and then extruded and granulated to obtain the resin composition.

2. The ionically modified molecular weight broad distribution polypropylene resin composition of claim 1, wherein, The polypropylene with a wide molecular weight distribution is selected from at least one of homopolymer polypropylene, ethylene-propylene random copolymer polypropylene, propylene-butadiene random copolymer polypropylene, ternary random copolymer polypropylene, and impact copolymer polypropylene.

3. The ionically modified molecular weight broad distribution polypropylene resin composition of claim 1, wherein, The organic acid / anhydride is selected from at least one of maleic acid, maleic anhydride, citric acid, methacrylic acid, acrylic acid, phthalic acid, phthalic anhydride, terephthalic acid, terephthalic anhydride, isophthalic acid, and isophthalic anhydride.

4. The ionically modified molecular weight broad distribution polypropylene resin composition of claim 1, wherein, The organometal salt is a metal salt containing an acetyl group.

5. The ionically modified molecular weight broad distribution polypropylene resin composition of claim 4, wherein, The organometal salt is selected from at least one of zinc acetylacetonate, aluminum acetylacetonate, copper acetylacetonate, cobalt acetylacetonate, and nickel acetylacetonate.

6. The ionically modified molecular weight broad distribution polypropylene resin composition of claim 1, wherein, The functional additives are selected from at least one of antioxidants, ultraviolet absorbers, antistatic agents, flame retardants, metal deactivators, pigments, nucleating agents, foam control agents, reinforcing agents, and lubricants.

7. The ionically modified molecular weight broad distribution polypropylene resin composition of claim 6, wherein, The antioxidant is a mixture of hindered phenolic antioxidants and phosphite antioxidants in a mass ratio of 1~5:5~1; wherein the hindered phenolic antioxidant is selected from antioxidant 1010, antioxidant 1076, antioxidant 245 or antioxidant 246; and the phosphite antioxidant is selected from triphenyl phosphate, trimethyl phosphate or antioxidant 168.

8. The ion-modified polypropylene resin composition with a wide molecular weight distribution according to claim 1, wherein, The functional additive is selected from at least one of fillers and stabilizers.

9. The ion-modified polypropylene resin composition with a wide molecular weight distribution according to claim 1, wherein, Based on 100 parts by weight of polypropylene with a wide molecular weight distribution, the content of the organic acid / anhydride is 0.5 to 1.5 parts by weight, the content of the organometallic salt is 0.3 to 1 part by weight, and the content of the functional additive is 0.03 to 0.5 parts by weight.

10. The ion-modified polypropylene resin composition with a wide molecular weight distribution according to claim 1, wherein, The polypropylene resin composition has a PDI of ≥ 8.0, a η0 at 210 °C of ≤ 8.0 x 10 4 Pa s, and a melt strength at 210 °C of ≥ 0.20 N.

11. The ion-modified polypropylene resin composition with a wide molecular weight distribution according to claim 10, wherein, The polypropylene resin composition has a PDI ≥ 9.

0.

12. The ion-modified polypropylene resin composition with a wide molecular weight distribution according to claim 10, wherein, The polypropylene resin composition has η0at 210 °C ≤ 5.5 x 10 4 Pa s.

13. The ion-modified polypropylene resin composition with a wide molecular weight distribution according to claim 10, wherein, The polypropylene resin composition has a melt strength of ≥0.22N at 210°C.

14. A method for preparing the ion-modified polypropylene resin composition with a wide molecular weight distribution according to any one of claims 1 to 13, characterized in that, The preparation method includes: 1) Polypropylene with a wide molecular weight distribution, organic acid / anhydride and organometallic salt are mixed and then extruded and granulated to obtain composite particles; 2) After mixing the composition particles with the functional additives, the mixture is extruded and granulated to obtain the ion-modified polypropylene resin composition with a wide molecular weight distribution.

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