CN114854136A

CN114854136A - High-haze high-light-transmittance polypropylene composition and preparation method and application thereof

Info

Publication number: CN114854136A
Application number: CN202210782617.8A
Authority: CN
Inventors: 陈嘉杰; 陈平绪; 叶南飚; 俞飞; 杨波; 吴国峰; 陈延安; 罗忠富
Original assignee: Kingfa Science and Technology Co Ltd
Current assignee: Kingfa Science and Technology Co Ltd
Priority date: 2022-07-05
Filing date: 2022-07-05
Publication date: 2022-08-05
Anticipated expiration: 2042-07-05
Also published as: WO2024007771A1; CN114854136B

Abstract

The invention discloses a high-haze high-transparency polypropylene composition and a preparation method and application thereof, and relates to the field of high polymer materials. The high-haze high-transparency polypropylene composition comprises the following components in parts by weight: copolymerized polypropylene: 85-95 parts of a solvent; a beta crystal form nucleating agent: 1-5 parts; nano zinc oxide: 1.5-4 parts; nano barium sulfate: 0.5 to 2.5 portions; lubricant: 0.5 to 2.5 portions; wherein the average grain diameter of the nano zinc oxide is 30-100 nm. According to the preparation method, the polypropylene copolymer and the beta-crystal nucleating agent are used for forming a resin matrix, the nano barium sulfate is used as an auxiliary material, the nano zinc oxide is used as a main material, and the particle size range of the nano zinc oxide is limited to be used as a filler for modification, so that the high-light-transmission high-haze polypropylene composition is prepared, and the material is good in heat resistance, low in smell and capable of being widely applied to automobile parts.

Description

High-haze high-light-transmittance polypropylene composition and preparation method and application thereof

Technical Field

The invention relates to the field of high polymer materials, in particular to a high-haze high-transparency polypropylene composition and a preparation method and application thereof.

Background

With the rapid development of the automobile industry in recent years, light weight, high quality, energy saving, environmental protection, functionalization and the like have become the main development directions of the automobile industry at present. The polypropylene is a general thermoplastic with excellent comprehensive performance, has the characteristics of low price, light weight, solvent resistance, easy recovery, no toxicity and the like, and is an important automobile light material. With the development of automobile intellectualization and the development of new energy automobiles, more new requirements are put forward on the original polypropylene material. Wherein, in the application of car lamp shade, printing opacity bumper, leaded light strip etc. need the material to have corresponding performance, and specific performance requires as follows: 1. high light transmittance: the lighting effect of the lamp is improved; 2. high haze: the dazzling defect caused by direct irradiation is avoided, and softer and uniform irradiation is realized; 3. thermal-oxidative aging resistance; 4. high heat resistance.

However, the photodiffusion flame-retardant product prepared by using the photodiffusion auxiliary agent can obtain photodiffusion performance, but the light transmittance is reduced, and the polypropylene material is degraded, cracked or pulverized after long-term use, so that the use of the product is influenced; under long-term light irradiation, the material is easily decomposed, so that the product turns yellow, and the service life is influenced.

At present, in the prior art, under the condition of not additionally adding a light diffusion agent, a hypophosphite and a brominated flame retardant are compounded to serve as a flame retardant system, and the mass ratio and the particle size of the hypophosphite are adjusted to prepare the high-haze high-light-transmission flame retardant polypropylene material. However, the modified material has a strong odor due to the matching use of hypophosphite and a brominated flame retardant, the subsequent low-odor treatment is often needed, and the material has poor heat resistance and short service life, and is not in accordance with the green sustainable environmental protection concept.

Disclosure of Invention

The invention provides a high-haze high-transparency polypropylene composition, and a preparation method and application thereof, and aims to provide the polypropylene composition which is excellent in heat resistance, low in smell and high in haze and transparency.

In order to solve the technical problems, the invention provides a high-haze high-transparency polypropylene composition, which comprises the following components in parts by weight: copolymerized polypropylene: 85-95 parts of a solvent; a beta crystal form nucleating agent: 1-5 parts; nano zinc oxide: 1.5-4 parts; nano barium sulfate: 0.5 to 2.5 portions; lubricant: 0.5 to 2.5 portions; wherein the average grain diameter of the nano zinc oxide is 30-100 nm.

By adopting the scheme, the beta crystal form nucleating agent can endow a polypropylene and nano filler blending system with better high light transmittance, and the heat resistance and deformation resistance of the material are improved, so that the material has more excellent performance and can be more weather-resistant. The copolymerization polypropylene has reduced crystallinity due to the fact that ethylene molecules randomly inserted into the main chain of the polymer block the crystal type arrangement of the polymer molecules, and has better transparency when forming a resin matrix with the beta-crystal type nucleating agent. The smaller the particle size of the nano-filler is, the size of the nano-filler is close to the coherence length of electrons, the property of the nano-filler is greatly changed due to self-organization caused by strong coherence, the size of the nano-filler is close to the wavelength of light, and the special effect that the nano-filler has a large surface is more favorable for light transmission, but after the particle size reaches a certain degree, the agglomeration generated by strong interaction among small particle sizes causes poor dispersion effect and unstable atomization and light transmission, so the application determines that the suitable average particle size of the nano-zinc oxide is 30-100 nm. When the nano zinc oxide and the nano barium sulfate are selected and matched with the beta crystal form nucleating agent for use, compared with other material combinations, the obtained modified polypropylene material has the properties of high light transmission and high haze, and simultaneously has the properties of low odor and better weather resistance. The inventor believes that the interaction between the nano zinc oxide and the nano barium sulfate is between the high molecular chains of the co-polypropylene, so that the chains generate relative movement, the gap generated by the relative movement plays an important role in light transmission and haze, and the haze and the light transmission of the final product are obviously improved.

Preferably, the average particle size of the nano barium sulfate is 300-500 nm.

Preferably, the melt flow rate of the copolymerized polypropylene is 2-3.5 g/10min at 230 ℃ and 2.16 kg.

Wherein the melt flow rate of the copolymerized polypropylene is detected according to the GB/T3682.1-2018 method.

By adopting the scheme, the melt flow rate of the co-polypropylene enables the blend system to have good processing fluidity, and the nano filler is uniformly sheared in the processing process and can be better dispersed in the system.

Preferably, the mass ratio of the nano zinc oxide to the nano barium sulfate is (2-3): 1.

by adopting the scheme, the material is not easy to yellow and has longer service life under the condition of the proportion of the nano zinc oxide and the nano barium sulfate, and the heat resistance, the high haze and the high light transmittance of the material can be further improved.

Preferably, the lubricant is a stearic acid soap lubricant.

Preferably, the composition comprises the following components in parts by weight: 87-90 parts of copolymerized polypropylene; 1.5-3 parts of beta-crystal nucleating agent; 2-3 parts of nano zinc oxide; 1-2 parts of nano barium sulfate; 1 part to 2 parts of lubricant.

Preferably, the melting point of the beta-crystalline nucleating agent is 100-120 ℃.

Preferably, the ultraviolet stabilizer also comprises 0.1 to 0.5 weight part of phenol main antioxidant, 0.1 to 0.5 weight part of phosphite auxiliary antioxidant and 0.2 to 1 weight part of ultraviolet stabilizer.

Preferably, the phenolic main antioxidant is 1010, the phosphite antioxidant is 168, and the ultraviolet stabilizer is 326.

In order to solve the above technical problems, the second object of the present invention is to provide a method for preparing a high haze and high transparency polypropylene composition, comprising the following steps:

(1) uniformly mixing nano zinc oxide, nano barium sulfate, co-polypropylene, a beta crystal form nucleating agent, a lubricant and other auxiliaries to obtain a mixed material;

(2) and adding the blend into an extrusion device, and carrying out melt blending and extrusion granulation, wherein the extrusion temperature of the extrusion device is 220-240 ℃ to obtain the high-haze high-transparency polypropylene composition.

As a preferred scheme, in the step (1), nano zinc oxide is placed in a container containing deionized water in advance, ultrasonic scattering treatment is carried out, vacuum drying is carried out, the nano zinc oxide and nano barium sulfate are stirred and mixed at the temperature of 30-50 ℃ to obtain a first premix, the polypropylene copolymer, the beta crystal form nucleating agent, the lubricant and other auxiliaries are uniformly mixed to obtain a second premix, and the first premix and the second premix are mixed and stirred to obtain a blend.

By adopting the scheme, the nano zinc oxide is subjected to ultrasonic scattering treatment, and after the scattering treatment, the nano zinc oxide is not easy to agglomerate, so that the state of the nano zinc oxide in a blending system is more stable.

In order to solve the above technical problems, the present invention also provides a high haze and high transparency polypropylene composition for use in automotive parts, such as automobile lamp covers, light-transmitting bumpers, light guide bars, etc.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

the polypropylene copolymer and the beta-crystal nucleating agent are used for forming a resin matrix, the nano barium sulfate is used as an auxiliary material, the nano zinc oxide is used as a main material, and the particle size range of the nano zinc oxide is limited to be used as a filler for modification, so that the high-light-transmission high-haze polypropylene composition is prepared, has good heat resistance and low odor, and can be widely applied to automobile parts.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following table 1 shows the source and type of the raw materials used in the examples and comparative examples of the present application, and if not otherwise specified, the antioxidant, the ultraviolet stabilizer, and the lubricant are commercially available, and the same antioxidant, ultraviolet stabilizer, and lubricant are used in the parallel experiments.

TABLE 1 sources and types of raw materials in examples and comparative examples of the present application

Examples 1 to 10

A high-haze high-transparency polypropylene composition comprises co-polypropylene, a beta-crystalline nucleating agent, nano-zinc oxide, nano-barium sulfate, a lubricant, a phenol main antioxidant 1010, a phosphite auxiliary antioxidant 168 and an ultraviolet stabilizer 326, wherein the average particle size of the nano-zinc oxide is 30-100nm, the average particle size of the nano-barium sulfate is 300nm, the melt flow rate (230 ℃/2.16 kg) of the co-polypropylene is 2.6g/10min, the lubricant is a soap stearate lubricant, the types and the contents of the components are shown in Table 2, and the preparation method of the composition comprises the following steps:

(1) putting a certain amount of nano zinc oxide into a container containing deionized water, scattering the nano zinc oxide for 3 minutes by ultrasonic waves, and drying the nano zinc oxide in vacuum for later use;

(2) stirring and mixing the nano zinc oxide treated in the step (1) and nano barium sulfate at 40 ℃ to obtain a first premix, and uniformly mixing the co-polypropylene, the nucleating agent, the lubricant, the main phenol antioxidant, the auxiliary phosphite antioxidant and the ultraviolet stabilizer to obtain a second premix;

(3) and adding the first premix into the second premix, stirring for 3 minutes to obtain a blend, adding the blend into a double-screw extruder, and carrying out melt blending, extrusion granulation, wherein the temperature of each section of the double-screw extruder is 230 ℃, so as to obtain the high-haze high-transparency polypropylene composition.

TABLE 2 Components and amounts in examples 1-10

Item	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6	Example 7	Example 8	Example 9	Example 10
											CoPP A (kg)	90	87	95	92	85	90	90	90	90	90
Beta crystal form nucleating agent (kg)	1.5	3	1	2	5	1.5	1.5	1.5	1.5	1.5
											Nano zinc oxide HN-J30 (kg)	2	3	2	1.5	4	-	-	-	-	-
Nano zinc oxide HN-J50 (kg)	-	-	-	-	-	2	-	-	-	-
											Nano zinc oxide DK-ZnO-100 (kg)	-	-	-	-	-	-	2	3	2.6	3.2
Nano barium sulfate BF03 (kg)	2	1	0.5	1	2.5	2	2	1	1.3	0.8
											Lubricant (kg)	2	1	0.5	2	2.5	2	2	2	2	2
Phenols main antioxidant (kg)	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
											Phosphite esters as auxiliary antioxidant (kg)	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
Ultraviolet stabilizer (kg)	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4	0.4

Example 11

The preparation method of the high-haze high-transparency polypropylene composition is the same as that of example 1 in all steps, reagents used in all steps and process parameters, and the difference is that the average particle size of nano barium sulfate is 100 nm.

Example 12

The preparation method of the high-haze high-transparency polypropylene composition is the same as that of example 1 in all steps, reagents used in all steps and process parameters, and the difference is that the average particle size of nano barium sulfate is 500 nm.

Example 13

The preparation method of the high-haze high-transparency polypropylene composition is the same as that of example 1 in all steps, reagents used in all steps and process parameters, and the difference is that the average particle size of nano barium sulfate is 800 nm.

Example 14

The preparation process of the polypropylene composition with high haze and high light transmittance includes the same steps, the same reagents and the same technological parameters as those in example 1, except that the melt flow rate of the polypropylene copolymer (230 deg.c/2.16 kg) is 23.0g/10 min.

Example 15

The preparation method of the high-haze high-transmittance polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in the embodiment 1, and the difference is that the addition amounts of the main phenolic antioxidant, the auxiliary phosphite antioxidant and the ultraviolet stabilizer are 0.

Comparative example 1

The preparation method of the high-haze high-transparency polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in example 1, the difference is that the polypropylene copolymer is replaced by the polypropylene homopolymer, and the melt flow rate (230 ℃/2.16 kg) of the polypropylene homopolymer is 6.8g/10 min.

Comparative example 2

The preparation method of the high-haze high-transparency polypropylene composition comprises the steps, the reagents used in the steps and the process parameters are the same as those in the embodiment 1, and the difference is that the average particle size of the nano zinc oxide is 300-500 nm.

Comparative example 3

The preparation method of the high-haze high-transparency polypropylene composition comprises the steps, reagents used in the steps and process parameters are the same as those in the embodiment 1, and the difference is that the average particle size of the nano zinc oxide is 15-20 nm.

Comparative example 4

The preparation method of the high-haze high-transparency polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in the example 1, and the difference is that the addition amount of the nano zinc oxide is 0.

Comparative example 5

The preparation method of the high-haze high-transparency polypropylene composition is that the steps, the reagents used in the steps and the process parameters are the same as those in the example 1, except that the addition amount of the nano barium sulfate is 0.

Comparative example 6

The preparation method of the high-haze high-transparency polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in the example 1, and the difference is that the addition amount of the nano zinc oxide is 5 kg.

Comparative example 7

The preparation method of the high-haze high-transparency polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in the example 1, and the difference is that the addition amount of the nano zinc oxide is 1 kg.

Comparative example 8

The preparation method of the high-haze high-transparency polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in example 1, and the difference is that the addition amount of the nano barium sulfate is 0.3 kg.

Comparative example 9

The preparation method of the high-haze high-transparency polypropylene composition is characterized in that the steps, the reagents used in the steps and the process parameters are the same as those in example 1, and the difference is that the addition amount of the nano barium sulfate is 3.5 kg.

Comparative example 10

The preparation method of the high-haze high-transparency polypropylene composition comprises the steps, the reagents used in the steps and the process parameters are the same as those in the embodiment 1, and the difference is that the beta crystal form nucleating agent is replaced by a high-molecular nucleating agent.

Comparative example 11

A high-haze high-light-transmission polypropylene composition comprises the following preparation steps:

(2) uniformly mixing 90kg of copolymerized polypropylene, 1.5kg of beta-crystal form nucleating agent, 2kg of soap stearate lubricant, 0.2kg of phenol main antioxidant 1010, 0.2kg of phosphite auxiliary antioxidant 168, 2.5kg of hypophosphite, 2.5kg of brominated flame retardant and 0.4kg of ultraviolet stabilizer 326 to obtain a blend material, wherein the melt flow rate (230 ℃/2.16 kg) of the copolymerized polypropylene is 2.6g/10 min;

(3) and adding the blend into a double-screw extruder, and carrying out melt blending and extrusion granulation, wherein the temperature of each section of the double-screw extruder is 230 ℃, so as to obtain the high-haze high-transparency polypropylene composition.

Performance test

1. Heat distortion temperature: examples 1-15 and comparative examples 1-11 were tested using the GB/T1633-;

2. notched izod impact strength: examples 1-15 and comparative examples 1-11 were tested according to ISO 180-;

3. haze and light transmittance: examples 1-15 and comparative examples 1-11 were tested according to GB/T2410-2008, sample size: 2.0mm 100mm and 1.0mm 100mm square plates, the test equipment was a WGT-S transmittance/haze meter from shanghai precision instruments ltd, and the test results are shown in table 4;

4. odor determination standard: the evaluation was carried out on a 1-6 scale as shown in Table 3 according to the standard VW' sPV3900E-2019, and the evaluation results are shown in Table 4, wherein the higher the scale, the larger the odor.

TABLE 3-standards for the popular automobile company VW' sPV3900E

1	Can not feel
		2	Can be felt without disturbing the human body
3	Can be obviously sensed but is not annoying
		4	Disturbing the human body
5	Strong aversion to cold
		6	Are difficult to tolerate

TABLE 4-results of Performance test of examples 1 to 15 and comparative examples 1 to 11

Test item Eyes of a user	Thermal deformation Temperature of （℃）	Cantilever beam gap Impact strength （kJ/m2）	Haze (%) 2.0 100 *100mm	Haze (%) 1.0 100*100mm	Light transmittance (%) 2.0100 100mm	Light transmittance (%) 1.0100 100mm	Smell(s)
								Examples 1	96	46.2	94.8	92.7	89.2	90.3	3
Examples 2	98	50.4	95.2	94.5	89.2	90.4	3
								Examples 3	95	45.5	95	94.3	88.8	90.3	3
Examples 4	95	45.3	94.2	91.8	89	89.7	3
								Examples 5	94	47.6	93.2	92.3	88.8	89.5	3
Examples 6	96	46.8	93.5	91.3	88.5	90.1	3
								Examples 7	97	47.2	93.1	90.2	87.9	89.4	3
Examples 8	97	47.8	94.8	92.8	89.2	91.6	3
								Examples 9	97	47.2	93.7	93.4	89.4	89.9	3
Examples 10	98	47.5	93.4	90.1	88.1	89.1	3
								Examples 11	95	46.0	92.5	90.4	87.4	88.4	3
Examples 12	97	45.7	93.4	91.6	88.4	89.3	3
								Examples 13	94	45.3	92.8	91.1	87.9	89.2	3
Examples 14	93	45.1	92.7	91.2	88.6	89.5	3
								Examples 15	95	46.1	94.6	92.5	89.1	90.1	3
Comparative example 1	95	44.5	83.4	84.5	83.1	82.4	3
								Comparative example 2	96	45.4	88.4	84.7	85.2	86.6	3
Comparative example 3	96	46.3	84.6	86.3	83.8	85.1	3
								Comparative example 4	92	42.2	86.5	82.8	85.8	85.2	3
Comparative example 5	96	46.2	85.8	84.7	86.2	85.4	3
								Comparative example 6	95	45.8	87.8	89.2	86.7	88.5	3
Comparative example 7	93	42.6	87.3	88.2	89.2	91.1	3
								Comparative example 8	91	41.8	87.1	88.3	89.4	90.5	3
Comparative example 9	97	46.8	81.8	83.4	84.6	85.7	3
								Comparative example 10	91	45.7	82.1	82.7	83.2	83.7	3
Comparative example 11	87	40.2	87.3	88.2	88.2	88.1	5

The performance test results of example 1 and comparative example 1 in table 4 show that the transparency of the resin matrix formed by the copolymerized polypropylene and the beta-crystalline nucleating agent is better, the copolymerized polypropylene is different from the homopolymerized polypropylene, and the ethylene molecules randomly inserted into the main chain of the polymer block the crystalline arrangement of the polymer molecules, so that the crystallinity of the copolymer is reduced, and the transmittance of the material is improved.

Combining the performance test results of example 1 and comparative examples 2 to 3 in table 4, it can be seen that when the average particle size of the nano zinc oxide is increased, there is a slight decrease in haze and transmittance, and the application limits the average particle size of the nano zinc oxide to the range of 30 to 100nm, so that the haze and transmittance of the material can be significantly improved while the mechanical and weather resistance of the material can be ensured.

Combining the performance test results of example 1 and comparative examples 4-9 in table 4, it can be seen that the present application limits the addition amount and the ratio between the nano zinc oxide and the nano barium sulfate, so that the nano zinc oxide and the nano barium sulfate can interact with each other between the polymer chains of the co-polypropylene, so that the chains generate relative movement, and the gaps generated by the relative movement contribute to the improvement of the light transmission and the haze.

The performance test results of example 1 and comparative example 10 in table 4 show that the beta-crystalline nucleating agent can endow a blending system of polypropylene and nanofiller with better high light transmittance, and the heat deformation resistance of the material is improved, so that the material has more excellent performance and can resist heat.

As shown by the performance detection results of examples 1 and 6-10 in Table 4, when the average particle size of the nano zinc oxide is increased, the heat distortion temperature and the mechanical properties of the material can be improved properly, but the haze and the transmittance are slightly reduced. When the size of the nano filler is kept, the mass ratio of the nano zinc oxide to the nano barium sulfate is (2-3): when the proportion is 1, the haze and the transmittance of the material are improved.

As can be seen from the performance test results of examples 1 and 14 in Table 4, the further optimization of the melt flow rate of the co-polypropylene can make the blend system have good processing flowability, help the nano-filler to be uniformly sheared during the processing process, better disperse in the system, and improve the haze and the light transmittance of the final product.

The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.

Claims

1. The high-haze high-light-transmission polypropylene composition is characterized by comprising the following components in parts by weight: and (3) polypropylene copolymer: 85-95 parts of a solvent; a beta crystal form nucleating agent: 1-5 parts; nano zinc oxide: 1.5-4 parts; nano barium sulfate: 0.5 to 2.5 portions; lubricant: 0.5 to 2.5 portions; wherein the average grain diameter of the nano zinc oxide is 30-100 nm.

2. The high haze high transparency polypropylene composition as claimed in claim 1, wherein the average particle size of the nano barium sulfate is 300-500 nm.

3. The high haze high transparency polypropylene composition according to claim 1, wherein the melt flow rate of the polypropylene copolymer is 2 to 3.5g/10min at 230 ℃ under 2.16 kg.

4. The high haze high transparency polypropylene composition according to claim 1, wherein the mass ratio of the nano zinc oxide to the nano barium sulfate is (2-3): 1.

5. the high haze high transparency polypropylene composition according to claim 1 wherein said lubricant is a stearic acid soap lubricant.

6. The high haze high transparency polypropylene composition according to claim 1, comprising the following components in parts by weight: 87-90 parts of co-polypropylene; 1.5-3 parts of beta-crystal nucleating agent; 2-3 parts of nano zinc oxide; 1-2 parts of nano barium sulfate; 1-2 parts of a lubricant.

7. The high haze high transparency polypropylene composition according to claim 1 further comprising 0.1 to 0.5 parts by weight of a primary phenolic antioxidant, 0.1 to 0.5 parts by weight of a secondary phosphite antioxidant, and 0.2 to 1 part by weight of an ultraviolet stabilizer.

8. A method for preparing a high haze and high transparency polypropylene composition, which is used for preparing the high haze and high transparency polypropylene composition as claimed in any one of claims 1 to 7, and comprises the following steps:

9. The method according to claim 8, wherein in the step (1), the nano zinc oxide is pre-placed in a container containing deionized water, dispersed by ultrasonic waves, dried in vacuum, and then mixed with nano barium sulfate at 30-50 ℃ to obtain a first premix, the co-polypropylene, the beta crystal form nucleating agent, the lubricant and other additives are uniformly mixed to obtain a second premix, and the first premix and the second premix are mixed and stirred to obtain a blend.

10. Use of the high haze high light transmission polypropylene composition according to any one of claims 1 to 7 in the field of automotive parts.