High-toughness high-transmittance polypropylene thin-wall injection molding material and preparation method thereof

Abstract

The invention relates to the technical field of polypropylene plastics, in particular to a high-toughness and high-transmittance polypropylene thin-wall injection molding material and a preparation method thereof.The high-toughness and high-transmittance polypropylene thin-wall injection molding material is prepared from polypropylene, a molecular weight regulator, a nucleating agent and a compound antioxidant, the molecular weight regulator, the nucleating agent, the antioxidant and the polypropylene are added into a high-speed mixer to be mixed, a premix is obtained, and then the high-toughness and high-transmittance polypropylene thin-wall injection molding material is obtained. And carrying out melt blending, extrusion and granulation on the premix through a twin-screw extruder to obtain the composite material. According to the high-toughness and high-transmittance polypropylene thin-wall injection molding material and the preparation method thereof, the mechanical property of polypropylene is improved by adding the auxiliaries into the polypropylene powder, and the prepared high-toughness and high-transmittance polypropylene thin-wall injection molding material is high in strength and sufficient in toughness and conforms to the regulations of national standards.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene plastics, in particular to a high-toughness and high-transparency polypropylene thin-wall injection molding material and a preparation method thereof. Background Art

[0002] When producing thin-walled injection molding polypropylene, the mold cavity space size is more stringent than ordinary injection molding, so the requirements for melt flow rate are also higher. Therefore, based on the requirements of processing technology and products, thin-walled injection molding special materials generally require a melt index of more than 60g / 10min, a bending modulus greater than or equal to 1600MPa, and a tensile yield strength of more than 35MPa.

[0003] At present, the methods for obtaining polypropylene thin-wall injection molding materials with high melt index mainly include hydrogen adjustment method and controlled rheology method. The hydrogen adjustment method is simple. In the process of propylene monomer polymerization into polypropylene macromolecular chain, hydrogen is used as a molecular weight regulator to reduce the molecular weight of polypropylene, thereby reducing the length of the polypropylene molecular chain, thereby obtaining a higher melt index. Its advantage is that the reaction activity is terminated by increasing the hydrogen ratio without introducing other impurities, but the range of polypropylene melt index that can be adjusted is limited. When its melt index exceeds 40g / 10min, it is difficult to produce thin-wall injection molding materials using hydrogen adjustment method, which seriously limits its application field.

[0004] The controlled rheology method has a simple process and low investment cost. During degradation, the peroxide can be decomposed into two oxygen-containing free radicals by heat at a lower temperature. The oxygen atom free radical attacks the hydrogen on the tertiary carbon of polypropylene, causing β-chain scission, and degrading the polypropylene into two short chain structures. After the controlled degradation reaction modification, the molecular chain of polypropylene becomes shorter, the relative molecular weight becomes smaller, and the molecular weight distribution becomes narrower, the melt index increases, and the fluidity is enhanced. The use of controlled rheology can flexibly produce special materials for polypropylene of different grades, and at the same time, it can reduce the generation of transition materials compared with the hydrogen adjustment method.

[0005] A Chinese patent document with publication number CN107383584 A discloses a high-rigidity and high-modulus thin-wall injection molding polypropylene material, which is prepared by comprising the following components in parts by weight: 100 parts of polypropylene prepared by a hydrogen adjustment method as a base resin, 0.03 to 0.15 parts of a rigidity-enhancing nucleating agent, 0.08 to 0.3 parts of an antioxidant, 0.02 to 0.1 parts of a halogen absorber and 0 to 0.06 parts of a lubricant are sequentially added into a high-speed mixer, mixed at a speed of 1000 to 1500 r / min for 5 to 15 minutes to prepare a premix; the premix to be mixed uniformly is fed into a twin-screw extruder for melt blending, the screw speed of the twin-screw extruder is 150 to 300 r / min, and the temperature of each heating zone of the barrel is 170° C. to 200° C.; the obtained blend is extruded into strips, cooled and dried, and then granulated to obtain the crystallization-controlled thin-wall injection molding polypropylene material. The invention adopts a method combining hydrogen adjustment method and degradation method. In the polymerization process of polypropylene, hydrogen is used as a molecular weight regulator to react with the active center of the catalyst to terminate the further growth of the polypropylene chain, so that the raw material resin has higher melt flow properties and improves the performance of polypropylene powder as a degradation modified raw material. Under normal conditions, the cooling of polypropylene melt will generate α-spherulites, and the connection between the grains is small, which is easy to cause stress concentration in the material and brittle fracture. By suppressing α crystals and inducing the formation of β crystals, γ crystals or intermediate phases, the elongation at break of the material can be improved to a certain extent, thereby improving its toughness. Therefore, after using the hydrogen adjustment method to improve the flow properties of its polypropylene powder, organic peroxides and other additives are added to the polypropylene resin for modification, further improving its flowability, mechanical and optical properties, and finally obtaining high-rigidity and high-modulus thin-wall injection molding polypropylene materials. The tensile yield stress and flexural modulus of the polypropylene material prepared by this method reach 38.0MPa and 1800Mpa respectively. It can be seen that the addition of rigid nucleating agents can effectively improve the rigidity of polypropylene materials. However, the notched impact strength of the special polypropylene material produced by this method is relatively low, and the maximum can only reach 1.4KJ / m 2 , thin-walled injection molding materials lack toughness and are brittle.

[0006] The Chinese patent document with publication number CN114426738A discloses a thin-walled polypropylene material for injection molding with high fluidity, high rigidity and low warpage. The invention uses propylene and a small amount of ethylene as raw materials to produce a high melt index random copolymer polypropylene base resin by hydrogen adjustment method, and adds a primary antioxidant, an auxiliary antioxidant, a halogen absorber and a nucleating agent, mixes them evenly according to a certain ratio, and then places them in a twin-screw extruder for melt granulation to obtain a polypropylene thin-walled injection molding material that meets the index requirements. The impact strength of the polypropylene can reach up to 2.2KJ / m 2The bending modulus is 1782MPa, the tensile yield stress is 36.2MPa, and the lowest haze is 53.4%. It can be seen that the thin-walled injection molding compound produced by blending and modifying propylene and ethylene as raw materials through hydrogen adjustment and degradation methods has excellent rigidity and toughness properties, but its haze is relatively high and the optical properties need to be improved. Summary of the invention

[0007] The present invention provides a high-toughness and high-transparency polypropylene thin-wall injection molding material and a preparation method thereof, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of low strength and insufficient toughness of the existing polypropylene thin-wall injection molding special materials.

[0008] One of the technical solutions of the present invention is achieved by the following measures: a high-toughness and high-transparency polypropylene thin-wall injection molding material, the raw materials by weight include Polypropylene 100 parts; Molecular weight regulator 0 to 5 parts; Nucleating agent 0 to 1 part; 0 to 1 part of compound antioxidant.

[0009] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above-mentioned polypropylene is a homopolymer polypropylene powder produced by a small-scale bulk process, and the homopolymer polypropylene powder is one of polypropylene 40, polypropylene 85 and polypropylene 150.

[0010] The molecular weight regulator is one of the molecular weight regulator NX101 and the molecular weight regulator PP10-301.

[0011] The compound antioxidant is composed of a main antioxidant and an auxiliary antioxidant in a mass ratio of 1:1. The main antioxidant is a hindered phenol antioxidant, and the auxiliary antioxidant is a phosphite antioxidant.

[0012] The hindered phenol antioxidant is one of antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), antioxidant 1076 (octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) and antioxidant 1098 (N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine).

[0013] The above-mentioned phosphite antioxidant is one of antioxidant 168 (tris(2,4-di-tert-butylphenyl) phosphite), antioxidant 626 (bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite) and antioxidant 618 (pentaerythritol dioctadecyl diphosphite).

[0014] The nucleating agent is an organic nucleating agent, and the organic nucleating agent is one of a sorbitol nucleating agent and an organic phosphate nucleating agent.

[0015] The organic nucleating agent is one of a DMDBS nucleating agent, a NA-21 nucleating agent and a HPN-20E nucleating agent.

[0016] The above-mentioned high-toughness and high-transparency polypropylene thin-wall injection molding material comprises the following raw materials by weight: Polypropylene 150 100 parts; Molecular weight regulator NX101 1.2 parts; Nucleating agent HPN-20E 0.7 parts; Compound antioxidant Primary oxidant 1010 0.08 parts; Auxiliary oxidant 168 0.08 parts.

[0017] The high-toughness and high-transparency polypropylene thin-wall injection molding compound is obtained by the following method: first, the required amount of molecular weight regulator, nucleating agent, antioxidant and polypropylene are added to a high-speed mixer and mixed to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding compound.

[0018] The mixing time of the high-speed mixer is 5 to 10 minutes.

[0019] The screw speed of the twin-screw extruder is set to 100 r / min to 140 r / min, the temperature of each heating zone of the barrel is 190° C. to 250° C., and the feed rate is 15% to 30%.

[0020] The second technical solution of the present invention is achieved by the following measures: a method for preparing a high-toughness and high-transparency polypropylene thin-wall injection molding compound, which is carried out according to the following method: first, the required amount of molecular weight regulator, nucleating agent, antioxidant and polypropylene are added to a high-speed mixer and mixed to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated by a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding compound.

[0021] The following is a further optimization and / or improvement of the second technical solution of the above invention: The mixing time of the high-speed mixer is 5 to 10 minutes.

[0022] The screw speed of the twin-screw extruder is set to 100 r / min to 140 r / min, the temperature of each heating zone of the barrel is 190° C. to 250° C., and the feed rate is 15% to 30%.

[0023] In summary, the present invention improves the mechanical properties of polypropylene by adding additives to polypropylene powder, and the prepared high-toughness and high-transparency polypropylene thin-wall injection molding material has high strength and sufficient toughness, which meets the requirements of national standards. DETAILED DESCRIPTION

[0024] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical scheme of the present invention and actual conditions. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all known and commonly used chemical reagents and chemicals in the prior art.

[0025] The present invention will be further described below in conjunction with embodiments: Embodiment 1: The high-toughness and high-transparency polypropylene thin-wall injection molding material, the raw materials by weight include Polypropylene 100 parts; Molecular weight regulator 0 to 5 parts; Nucleating agent 0 to 1 part; 0 to 1 part of compound antioxidant.

[0026] Example 2: As an optimization of the above example, the polypropylene is a homopolymer polypropylene powder produced by a small-scale bulk process, and the homopolymer polypropylene powder is one of polypropylene 40, polypropylene 85 and polypropylene 150.

[0027] The raw materials of the present invention, polypropylene 40, polypropylene 85 and polypropylene 150, are all provided by PetroChina Urumqi Petrochemical Company.

[0028] Example 3: As an optimization of the above example, the molecular weight regulator is one of the molecular weight regulator NX101 (dialkyl organic peroxide) and the molecular weight regulator PP10-301 (cyclic ketone organic peroxide).

[0029] Example 4: As an optimization of the above example, the compound antioxidant is composed of a primary antioxidant and an auxiliary antioxidant in a mass ratio of 1:1, the primary antioxidant is a hindered phenol antioxidant, and the auxiliary antioxidant is a phosphite antioxidant.

[0030] Example 5: As an optimization of the above examples, the hindered phenol antioxidant is one of antioxidant 1010 (pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), antioxidant 1076 (octadecylβ-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) and antioxidant 1098 (N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine).

[0031] Example 6: As an optimization of the above example, the phosphite antioxidant is one of antioxidant 168 (tris(2,4-di-tert-butylphenyl) phosphite), antioxidant 626 (bis(2,4-di-tert-butylphenol) pentaerythritol diphosphite) and antioxidant 618 (pentaerythritol dioctadecyl diphosphite).

[0032] Example 7: As an optimization of the above example, the nucleating agent is an organic nucleating agent, and the organic nucleating agent is one of a sorbitol nucleating agent and an organic phosphate nucleating agent.

[0033] Example 8: As an optimization of the above example, the organic nucleating agent is one of DMDBS nucleating agent (acetal nucleating agent), NA-21 nucleating agent (organophosphate nucleating agent) and HPN-20E nucleating agent (hindered phenol nucleating agent).

[0034] Example 9: As an optimization of the above example, a high-toughness and high-transparency polypropylene thin-wall injection molding material is obtained by the following method: first, the required amount of molecular weight regulator, nucleating agent, antioxidant and polypropylene are added to a high-speed mixer and mixed to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding material.

[0035] Example 10: As an optimization of the above example, the mixing time of the high-speed mixer is 5 min to 10 min.

[0036] Example 11: As an optimization of the above example, the screw speed of the twin-screw extruder is set to 100 r / min to 140 r / min, the temperature of each heating zone of the barrel is 190°C to 250°C, and the feed amount is 15% to 30%.

[0037] Compared with the prior art, the present invention has the following beneficial effects: (1) The method for preparing the high-toughness and high-transparency polypropylene thin-wall injection molding compound of the present invention is easy to operate and the process parameters can be flexibly adjusted during production to obtain a polypropylene thin-wall injection molding compound with better performance.

[0038] (2) The high-toughness and high-transparency polypropylene thin-wall injection molding material of the present invention increases the crystallization rate and density of the crystalline phase of polypropylene, refines the grain size, and improves the mechanical properties of polypropylene by adding additives to the degraded polypropylene pellets. The strength of the high-toughness and high-transparency polypropylene thin-wall injection molding material can reach 1.80KJ / m 2 Up to 2.24KJ / m 2 , with sufficient toughness.

[0039] Embodiment 12: The high-toughness and high-transparency polypropylene thin-wall injection molding material comprises 100 parts of polypropylene (polypropylene 40) by weight as raw materials, and is obtained by the following method: firstly, a required amount of polypropylene is added into a high-speed mixer and mixed for 5 minutes, and then melt-blended, extruded and granulated by a twin-screw extruder to obtain the high-toughness and high-transparency polypropylene thin-wall injection molding material; wherein, the screw speed of the twin-screw extruder is set to 100r / min, the temperature of each heating zone of the barrel is 190°C, and the feed amount is 15%.

[0040] Embodiment 13: The high-toughness and high-transparency polypropylene thin-wall injection molding material comprises, by weight, 100 parts of polypropylene (polypropylene 85), 5 parts of a molecular weight regulator (molecular weight regulator PP10-301), 1 part of a nucleating agent (NA-21 nucleating agent) and 1 part of a compound antioxidant (the mass ratio of antioxidant 1076 to antioxidant 626 is 1:1), and is obtained by the following method: firstly, a required amount of the molecular weight regulator, the nucleating agent, the antioxidant and the polypropylene are added into a high-speed mixer and mixed for 10 minutes to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding material; wherein the screw speed of the twin-screw extruder is set to 140 r / min, the temperature of each heating zone of the barrel is 250° C., and the feed amount is 30%.

[0041] Embodiment 14: The high-toughness and high-transparency polypropylene thin-wall injection molding material comprises, by weight, 100 parts of polypropylene (polypropylene 150), 0.6 parts of a molecular weight regulator (molecular weight regulator NX101), 0.5 parts of a nucleating agent (HPN-20E nucleating agent) and 0.5 parts of a compound antioxidant (a primary antioxidant (antioxidant 1098) and an auxiliary antioxidant (antioxidant 618) in a mass ratio of 1:1), and is obtained by the following method: firstly, a required amount of the molecular weight regulator, the nucleating agent, the antioxidant and polypropylene are added into a high-speed mixer and mixed for 8 minutes to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding material; wherein the screw speed of the twin-screw extruder is set to 110 r / min, the temperature of each heating zone of the barrel is 220° C., and the feed rate is 25%.

[0042] Embodiment 15: The high-toughness and high-transparency polypropylene thin-wall injection molding material comprises, by weight, 100 parts of polypropylene (polypropylene 150), 0.6 parts of a molecular weight regulator (molecular weight regulator NX101), 0 parts of a nucleating agent (HPN-20E nucleating agent) and 0.16 parts of a compound antioxidant (0.08 parts of a main antioxidant 1010 and 0.08 parts of an auxiliary antioxidant 168), and is obtained by the following method: firstly, a required amount of the molecular weight regulator, the nucleating agent, the antioxidant and polypropylene are added into a high-speed mixer and mixed for 10 minutes to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding material; wherein the screw speed of the twin-screw extruder is set to 110 r / min, the temperature of each heating zone of the barrel is 220° C., and the feed rate is 25%.

[0043] Example 16: The difference from Example 15 is that the weight part of the raw material molecular weight regulator (molecular weight regulator NX101) is changed from 0.6 parts to 0.9 parts.

[0044] Example 17: The difference from Example 15 is that the weight of the raw material molecular weight regulator (molecular weight regulator NX101) is changed from 0.6 parts to 1.2 parts.

[0045] Example 18: The difference from Example 15 is that the weight of the raw material molecular weight regulator (molecular weight regulator NX101) is changed from 0.6 parts to 1.2 parts, and the weight of the nucleating agent (HPN-20E nucleating agent) is changed from 0 parts to 0.7 parts.

[0046] Example 19: The difference from Example 15 is that the weight part of the raw material molecular weight regulator (molecular weight regulator NX101) is changed from 0.6 parts to 0 parts.

[0047] Example 20: The difference from Example 15 is that the weight of the raw material molecular weight regulator (molecular weight regulator NX101) is changed from 0.6 parts to 1.2 parts, and the weight of the nucleating agent (HPN-20E nucleating agent) is changed from 0 parts to 0.3 parts.

[0048] Example 21: The difference from Example 17 is that 1.2 parts of the raw material molecular weight regulator (molecular weight regulator NX101) is changed to 0.9 parts of the molecular weight regulator (molecular weight regulator PP10-301).

[0049] Example 22: The difference from Example 17 is that the raw material polypropylene 150 is changed to polypropylene 040.

[0050] Example 23: The difference from Example 17 is that the raw material polypropylene 150 is changed to polypropylene 085.

[0051] Example 24: The high-toughness and high-transparency polypropylene thin-wall injection molding materials prepared in Examples 15 to 23 of the present invention were subjected to performance tests. The performance test results are shown in Tables 1 to 3. As can be seen from Table 1, the strength of the high-toughness and high-transparency polypropylene thin-wall injection molding materials prepared in Examples 15 to 23 of the present invention can reach 1.80 KJ / m 2 Up to 2.24KJ / m 2 , sufficient toughness, in line with national standards.

[0052] It can be seen from Examples 15, 16, 17 and 19 of the present invention in Table 1 that, under the same amount of antioxidant added, as the amount of molecular weight regulator NX101 added increases, the flowability and mechanical properties of the polypropylene product are significantly improved, and the haze and yellowness index are also reduced. By adding 1.2 parts of molecular weight regulator to modify and degrade polypropylene, the melt index is increased from the initial 12.6g / 10min to 64.1g / 10min. Therefore, the optimal value of the amount of molecular weight regulator added in the raw material ratio of the present invention is 1.2 parts.

[0053] It can be seen from Examples 17, 18 and 20 of the present invention in Table 1 that the addition of the nucleating agent greatly improves the mechanical properties of the polypropylene product, and the maximum impact strength can reach 2.24 KJ / m 2 As the amount of nucleating agent added increases, the haze and yellow index performances are also improved. Therefore, the optimal value of the amount of nucleating agent added in the present invention is 0.7 parts.

[0054] It can be seen from Examples 17, 18 and 21 of the present invention in Table 2 that the molecular weight regulator PP10-301 has better degradation performance for polypropylene than NX101. When the addition amount is the same as 0.9 parts, the polypropylene melt index obtained by using the molecular regulator PP10-301 is 6.2 g / 10 min higher than that by using the molecular regulator NX101. Therefore, the molecular weight regulator of the raw material of the present invention is preferably NX101.

[0055] From Table 3, it can be seen that when the raw material polypropylene is polypropylene 150, the molecular regulator NX101 has the best modification effect, and the obtained high-toughness and high-transparency polypropylene thin-wall injection molding material has the highest melt index. Therefore, the raw material polypropylene of the present invention is preferably polypropylene 150.

[0056] In summary, the high-toughness and high-transparency polypropylene thin-wall injection molding materials obtained in Examples 15 to 23 of the present invention all have good mechanical properties, and the strength can reach 1.9 KJ / m 2 Up to 2.24KJ / m 2 Among them, the high-toughness and high-transparency polypropylene thin-wall injection molding material obtained in Example 18 of the present invention has the best mechanical properties, a higher melt index, lower haze and yellow index performance, and the best optical properties.

[0057] In summary, the present invention improves the mechanical properties of polypropylene by adding additives to polypropylene powder, and the prepared high-toughness and high-transparency polypropylene thin-wall injection molding material has high strength and sufficient toughness, and meets the requirements of national standards.

[0058] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A high-toughness and high-transparency polypropylene thin-wall injection molding material, characterized in that Raw materials include by weight Polypropylene 100 parts; Molecular weight regulator 0 to 5 parts; Nucleating agent 0 to 1 part; 0 to 1 part of compound antioxidant.

2. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to claim 1, characterized in that The polypropylene is a homopolymer polypropylene powder produced by a small-scale bulk process, and the homopolymer polypropylene powder is one of polypropylene 40, polypropylene 85 and polypropylene 150.

3. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to claim 1 or 2, characterized in that The molecular weight regulator is one of molecular weight regulator NX101 and molecular weight regulator PP10-301.

4. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to claim 1, 2 or 3, characterized in that The compound antioxidant consists of a main antioxidant and an auxiliary antioxidant in a mass ratio of 1:

1. The main antioxidant is a hindered phenol antioxidant, and the auxiliary antioxidant is a phosphite antioxidant.

5. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to claim 4, characterized in that The hindered phenol antioxidant is one of antioxidant 1010, antioxidant 1076 and antioxidant 1098; or / and the phosphite antioxidant is one of antioxidant 168, antioxidant 626 and antioxidant 618.

6. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to any one of claims 1 to 5, characterized in that The nucleating agent is an organic nucleating agent, and the organic nucleating agent is one of a sorbitol nucleating agent and an organic phosphate nucleating agent.

7. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to claim 6, characterized in that The organic nucleating agent is one of a DMDBS nucleating agent, a NA-21 nucleating agent and a HPN-20E nucleating agent.

8. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to any one of claims 1 to 7, characterized in that The method is as follows: first, the required amount of molecular weight regulator, nucleating agent, antioxidant and polypropylene are added into a high-speed mixer to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding material.

9. The high-toughness and high-transparency polypropylene thin-wall injection molding material according to claim 8, characterized in that The mixing time of the high-speed mixer is 5 min to 10 min; or / and, the screw speed of the twin-screw extruder is set to 100 r / min to 140 r / min, the temperature of each heating zone of the barrel is 190° C. to 250° C., and the feed amount is 15% to 30%.

10. A method for preparing a high-toughness and high-transparency polypropylene thin-wall injection molding material according to any one of claims 1 to 7 or 9, characterized in that The method is as follows: first, the required amount of molecular weight regulator, nucleating agent, antioxidant and polypropylene are added into a high-speed mixer to obtain a premix; then, the obtained premix is ​​melt-blended, extruded and granulated through a twin-screw extruder to obtain a high-toughness and high-transparency polypropylene thin-wall injection molding material.

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