Preparation method of impact-resistant modified polypropylene particles

Abstract

The invention discloses a preparation method of impact-resistant modified polypropylene particles, and relates to the technical field of preparation of polypropylene particles. According to the invention, allyl-3-hydroxymorpholine-4-carboxylate, diallyl disulfide and propylene are copolymerized to prepare modified polyolefin, so that the impact resistance of the plastic is improved, meanwhile, a morpholine structure can be combined with bacteria to achieve an antibacterial effect, and on the basis, thioether bonds improve the flexibility of polymer chains and improve the overall impact resistance; then 4-hydroxy-3-methoxyphenyl ethylene glycol-4-potassium sulfate and 2-allyloxy phenoxy methyl ethylene oxide react to enhance the mechanical strength of the material, and meanwhile, an epoxy group and modified polyolefin are crosslinked to form a three-dimensional network structure, so that the impact resistance and wear resistance are improved; sulfate radicals enable the material not to be subjected to replacement reaction with an acid medium, so that the corrosion resistance is enhanced; carrying out cation exchange with montmorillonite to obtain modified montmorillonite; and finally, cross-linking and mixing the two components to realize the impact-resistant, antibacterial and corrosion-resistant effects.

Description

Technical Field

[0001] This invention relates to the field of polypropylene particle preparation technology, specifically a method for preparing impact-modified polypropylene particles. Background Technology

[0002] Polypropylene, as a general-purpose polymer material, has become the third largest general-purpose plastic after polyethylene and polyvinyl chloride, and is the fastest-growing variety of plastic in terms of production volume. It is widely used in various fields of industrial production. However, ordinary polypropylene has poor toughness, is prone to brittleness at low temperatures, and its non-polar linear chain structure and high crystallinity reduce its compatibility with other polymer materials and inorganic fillers. Therefore, the modification of polypropylene to prepare polypropylene alloys and composite materials with excellent performance has always been a focus of attention for academia and industry.

[0003] Currently, the common method of imparting antibacterial properties to polypropylene is through melt blending with metal ions such as silver. However, excessive silver ion content poses a risk of poisoning human cells. In addition, some biocompatible natural antibacterial agents, such as chitosan, have been added to polypropylene, but the antibacterial effect of the resulting material is very limited, and the antibacterial function is permanently lost once the antibacterial agent is lost. Furthermore, antibacterial modified polypropylene particles typically cannot withstand high-intensity impacts, have poor toughness, and are highly sensitive to the environment, easily corroded by acids and alkalis, thus losing their effectiveness. Therefore, there is a need to invent an antibacterial, impact-resistant, and corrosion-resistant polypropylene material. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing impact-resistant modified polypropylene particles to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing impact-resistant polypropylene particles, comprising the following preparation steps: Add 5-9 parts of montmorillonite to 178-320 parts of deionized water, stir at 60-70℃ and 200rpm for 10-14 hours, add 2-6 parts of modifier, heat to 70-90℃, react for 8-10 hours, centrifuge for 10 minutes, take the solid, wash it 3 times with deionized water, and dry it in an oven at 50-70℃ for 8-10 hours to obtain modified montmorillonite; Under nitrogen protection, 12-18 parts of allyl 3-hydroxymorpholine-4-carboxylic acid ester, 6-10 parts of diallyl disulfide, and 68-122 parts of toluene were mixed evenly. The rotation speed was adjusted to 100 rpm, and propylene gas was introduced to a certain pressure. 2-4 parts of catalyst were added, and the temperature was raised to 60-70℃. The reaction was carried out for 4-8 hours. During the reaction, propylene gas was continuously introduced to maintain a constant pressure. After the reaction was completed, air was introduced, and 24-36 parts of hydrochloric acid ethanol solution were added. The mixture was stirred for 40-60 minutes, and the solid was collected by suction filtration. The solid was washed three times with acetone and dried at 70-90℃ for 6-10 hours to obtain the modified polyolefin. Add 65-89 parts of polypropylene, 26-48 parts of modified montmorillonite, 51-77 parts of modified polyolefin, and 2-4 parts of stannous chloride to a mixer and mix for 30-40 minutes. Add 8-12 parts of stabilizer and 12-24 parts of filler and continue mixing for 10-20 minutes. Then, extrude the mixture in a twin-screw compounding extruder and pelletize it to obtain impact-resistant modified polypropylene granules.

[0006] Further, the preparation method of the modifier in step (1) is as follows: 17-23 parts of 4-hydroxy-3-methoxyphenyl ethylene glycol-4-sulfate potassium salt and 25-33 parts of 2-allyloxyphenoxymethyl ethylene oxide are mixed evenly, 1-5 parts of 10wt% potassium carbonate aqueous solution are added, and the mixture is reacted at 90-110℃ for 16-24h. The mixture is extracted three times with 98-134 parts of ethyl acetate, and the organic phase is concentrated at 35℃ and vacuum degree -0.08MPa for 2-4h to obtain the modifier.

[0007] Furthermore, the centrifuge speed in step (1) is 3000 r / min.

[0008] Furthermore, the pressure mentioned in step (2) is 3 MPa.

[0009] Furthermore, the catalyst in step (2) is one or more of the following: chromium-based catalyst, titanium-based catalyst, and vanadium-based catalyst.

[0010] Furthermore, the concentration of hydrochloric acid in the hydrochloric acid ethanol solution in step (2) is 1 mol / L.

[0011] Furthermore, the temperature of the mixer in step (3) is 130~150℃.

[0012] Furthermore, the stabilizer in step (3) is one or more of sodium alginate, zinc stearate, and barium stearate.

[0013] Furthermore, the filler in step (3) is one or more of talc, calcium carbonate, kaolin, and cellulose.

[0014] Furthermore, the parameters of the twin-screw compounding extruder in step (3) are: head temperature 160~180℃, screw speed 130~210r / min, and extrusion pressure 5~11MPa.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention prepares modified polyolefins by involving allyl 3-hydroxymorpholine-4-carboxylic acid ester and diallyl disulfide in the polymerization process of polypropylene. Large side groups are introduced into the main chain to form a non-coplanar structure, reducing the interaction and close packing between polymer molecular chains, increasing the distance between molecular chains and the free volume, allowing it to load more modified montmorillonite, thereby indirectly improving shear resistance and impact resistance of the plastic. Simultaneously, the morpholine structure can bind to bacteria and DNA, inhibiting their replication and leading to bacterial death, thus achieving an antibacterial effect. Furthermore, the longer bond length of the sulfide bond increases the space for chain segment movement, reduces the interaction and encapsulation between polymer chain segments, and improves the flexibility of the polymer chain, thereby enhancing the overall impact resistance. Finally, it is cross-linked and mixed with modified montmorillonite to achieve impact resistance, antibacterial properties, and corrosion resistance.

[0016] Modified montmorillonite is prepared from 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt, 2-allyloxyphenoxymethyl ethylene oxide, and montmorillonite. The hydroxyl groups of 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt are added to the alkenyl groups of 2-allyloxyphenoxymethyl ethylene oxide, introducing phenyl groups to enhance the material's mechanical strength and improve wear resistance. Simultaneously, the presence of epoxy groups facilitates cross-linking with functional groups in modified polyolefins, forming a three-dimensional network structure, thereby improving impact resistance and wear resistance. Furthermore, the presence of sulfate groups prevents the plastic from undergoing displacement reactions with acidic media, enhancing corrosion resistance. Then, it is combined with montmorillonite, and through cation exchange, organic groups are deposited on the surface of montmorillonite or inserted into its interlayer, increasing the interlayer spacing, improving the dispersibility and stability of montmorillonite, and enhancing its compatibility with polypropylene. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The test methods for various indicators of the impact-resistant polypropylene particles produced in the following embodiments are as follows: Notched impact strength at 20°C: Take the same mass of the example and comparative examples, make strip samples of 10mm×5mm×6mm, and test according to ASTM D256.

[0019] Bending strength: Take the same mass of the example and comparative examples, make strip samples of 160mm×13mm×3mm, and test them according to ASTM D638.

[0020] Antibacterial rate: Take the same mass of the example and comparative examples and test them according to QB / T 2591.

[0021] Acid resistance: Samples of the same size from both the example and comparative examples were immersed in a 1 mol / L hydrochloric acid solution for 100 h and then removed. The grades were as follows: Grade 0 - mass change rate before and after corrosion less than 0.001%; ​​Grade 1 - mass change rate before and after corrosion greater than 0.001% and less than 0.010%; Grade 2 - mass change rate before and after corrosion greater than 0.010% and less than 0.030%; Grade 3 - mass change rate before and after acid corrosion greater than 0.030% and less than 0.050%; Grade 4 - mass change rate before and after corrosion greater than 0.050% and less than 0.10%.

[0022] Example 1: (1) 17 parts of 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt and 25 parts of 2-allyloxyphenoxymethyl ethylene oxide were mixed evenly, and 1 part of 10wt% potassium carbonate aqueous solution was added. The mixture was reacted at 90℃ for 16h, and extracted three times with 98 parts of ethyl acetate. The organic phase was concentrated at 35℃ and vacuum degree -0.08MPa for 2h to obtain the modifier. (2) Add 5 parts of montmorillonite to 178 parts of deionized water, stir at 60℃ and 200 rpm for 10 h, add 2 parts of modifier, heat to 70℃, react for 8 h, place in a centrifuge and centrifuge at 3000 r / min for 10 min, take the solid and wash it 3 times with deionized water, dry it in an oven at 50℃ for 8 h to obtain modified montmorillonite; (3) Under nitrogen protection, 12 parts of allyl 3-hydroxymorpholine-4-carboxylic acid ester, 6 parts of diallyl disulfide and 68 parts of toluene were mixed evenly, the rotation speed was adjusted to 100 rpm, propylene gas was introduced to 3 MPa, 2 parts of chromium catalyst were added, the temperature was raised to 60℃, and the reaction was carried out for 4 h. During the reaction, propylene gas was continuously introduced to keep the pressure constant. After the reaction was completed, air was introduced, 24 parts of hydrochloric acid ethanol solution with a concentration of 1 mol / L were added, the mixture was stirred for 40 min, the solid was filtered, washed 3 times with acetone, and dried at 70℃ for 6 h to obtain modified polyolefin. (4) Add 65 parts of polypropylene, 26 parts of modified montmorillonite, 51 parts of modified polyolefin and 2 parts of stannous chloride to a mixer and mix at 130°C for 30 min. Add 8 parts of sodium alginate and 12 parts of talc and continue mixing for 10 min. Then feed the mixture into a twin-screw compounding extruder and extrude it. The feed head temperature is 160°C, the screw speed is 130 r / min and the extrusion pressure is 5 MPa. Pelletize the mixture to obtain impact-resistant modified polypropylene granules.

[0023] Example 2: (1) 20 parts of 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt and 29 parts of 2-allyloxyphenoxymethyl ethylene oxide were mixed evenly, and 3 parts of 10wt% potassium carbonate aqueous solution were added. The mixture was reacted at 100℃ for 20h, and extracted three times with 116 parts of ethyl acetate. The organic phase was concentrated at 35℃ and vacuum degree -0.08MPa for 3h to obtain the modifier. (2) Add 7 parts of montmorillonite to 249 parts of deionized water, stir at 65℃ and 200 rpm for 12 h, add 4 parts of modifier, heat to 80℃, react for 9 h, place in a centrifuge and centrifuge at 3000 r / min for 10 min, take the solid and wash it 3 times with deionized water, dry it in an oven at 60℃ for 9 h to obtain modified montmorillonite; (3) Under nitrogen protection, 15 parts of allyl 3-hydroxymorpholine-4-carboxylic acid ester, 8 parts of diallyl disulfide and 95 parts of toluene were mixed evenly, the rotation speed was adjusted to 100 rpm, propylene gas was introduced to 3 MPa, 3 parts of titanium catalyst were added, the temperature was raised to 65℃, and the reaction was carried out for 6 h. During the reaction, propylene gas was continuously introduced to keep the pressure constant. After the reaction was completed, air was introduced, 30 parts of hydrochloric acid ethanol solution with a concentration of 1 mol / L were added, the mixture was stirred for 50 min, the solid was filtered, washed 3 times with acetone, and dried at 80℃ for 8 h to obtain modified polyolefin. (4) 77 parts polypropylene, 37 parts modified montmorillonite, 64 parts modified polyolefin and 3 parts stannous chloride were added to a mixer and mixed at 140°C for 35 min. 10 parts zinc stearate and 18 parts calcium carbonate were added and mixed for another 15 min. The mixture was then fed into a twin-screw extruder and extruded at a head temperature of 170°C, a screw speed of 170 r / min and an extrusion pressure of 8 MPa. The mixture was then pelletized to obtain impact-resistant modified polypropylene granules.

[0024] Example 3: (1) 23 parts of 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt and 33 parts of 2-allyloxyphenoxymethyl ethylene oxide were mixed evenly, and 5 parts of 10wt% potassium carbonate aqueous solution were added. The mixture was reacted at 110℃ for 24h, and extracted three times with 134 parts of ethyl acetate. The organic phase was concentrated at 35℃ and vacuum degree -0.08MPa for 4h to obtain the modifier. (2) Add 9 parts of montmorillonite to 320 parts of deionized water, stir at 70℃ and 200rpm for 14h, add 6 parts of modifier, heat to 90℃, react for 10h, place in a centrifuge and centrifuge at 3000r / min for 10min, take the solid and wash it 3 times with deionized water, dry in an oven at 70℃ for 10h to obtain modified montmorillonite; (3) Under nitrogen protection, 18 parts of allyl 3-hydroxymorpholine-4-carboxylic acid ester, 10 parts of diallyl disulfide and 122 parts of toluene were mixed evenly, the rotation speed was adjusted to 100 rpm, propylene gas was introduced to 3 MPa, 4 parts of vanadium catalyst were added, the temperature was raised to 70℃, and the reaction was carried out for 8 h. During the reaction, propylene gas was continuously introduced to keep the pressure constant. After the reaction was completed, air was introduced, 36 parts of hydrochloric acid ethanol solution with a concentration of 1 mol / L were added, the mixture was stirred for 60 min, the solid was filtered, washed 3 times with acetone, and dried at 90℃ for 10 h to obtain modified polyolefin. (4) Add 89 parts of polypropylene, 48 parts of modified montmorillonite, 77 parts of modified polyolefin, and 4 parts of stannous chloride to a mixer and mix at 150°C for 40 min. Add 12 parts of barium stearate and 24 parts of kaolin and continue mixing for 20 min. Then, feed the mixture into a twin-screw compounding extruder and extrude it. The feed head temperature is 180°C, the screw speed is 210 r / min, and the extrusion pressure is 11 MPa. Pelletize the mixture to obtain impact-resistant modified polypropylene granules.

[0025] Comparative Example 1: The difference between Comparative Example 1 and Example 2 lies in step (3). Step (3) is changed to: Under nitrogen protection, 8 parts of diallyl disulfide and 95 parts of toluene are mixed evenly, the rotation speed is adjusted to 100 rpm, propylene gas is introduced to 3 MPa, 3 parts of titanium catalyst are added, the temperature is raised to 65°C, and the reaction is carried out for 6 hours. During the reaction, propylene gas is continuously introduced to maintain a constant pressure. After the reaction is completed, air is introduced, 30 parts of hydrochloric acid ethanol solution with a concentration of 1 mol / L are added, the mixture is stirred for 50 minutes, the solid is filtered, washed 3 times with acetone, and dried at 80°C for 8 hours to obtain modified polyolefin. The remaining steps are the same as in Example 2.

[0026] Comparative Example 2: The difference between Comparative Example 2 and Example 2 lies in step (3). Step (3) is changed to: Under nitrogen protection, 15 parts of allyl 3-hydroxymorpholine-4-carboxylic acid ester and 95 parts of toluene are mixed evenly, the rotation speed is adjusted to 100 rpm, propylene gas is introduced to 3 MPa, 3 parts of titanium catalyst are added, the temperature is raised to 65°C, and the reaction is carried out for 6 hours. During the reaction, propylene gas is continuously introduced to maintain a constant pressure. After the reaction is completed, air is introduced, 30 parts of hydrochloric acid ethanol solution with a concentration of 1 mol / L are added, the mixture is stirred for 50 minutes, the solid is filtered, washed 3 times with acetone, and dried at 80°C for 8 hours to obtain the modified polyolefin. The remaining steps are the same as in Example 2.

[0027] Comparative Example 3: The difference between Comparative Example 3 and Example 2 lies in step (4). Step (4) is changed to: adding 77 parts of polypropylene, 37 parts of modified montmorillonite, 64 parts of modified polyolefin, 10 parts of zinc stearate, and 18 parts of calcium carbonate into a mixer and mixing at 100°C for 10 minutes. The mixture is then fed into a twin-screw compounding extruder for extrusion, with a feed head temperature of 170°C, a screw speed of 170 r / min, and an extrusion pressure of 8 MPa. The mixture is then pelletized to obtain impact-resistant modified polypropylene granules. The remaining steps are the same as in Example 2.

[0028] Comparative Example 4: The difference between Comparative Example 4 and Example 2 is that step (1) is omitted, and step (2) is changed to: adding 7 parts of montmorillonite to 249 parts of deionized water, stirring at 65°C and 200 rpm for 12 h, adding 4 parts of 2-allyloxyphenoxymethyl ethylene oxide, heating to 80°C, reacting for 9 h, centrifuging at 3000 r / min for 10 min, taking the solid, washing it 3 times with deionized water, and drying it in a 60°C oven for 9 h to obtain modified montmorillonite. The remaining steps are the same as in Example 2.

[0029] Comparative Example 5: The difference between Comparative Example 5 and Example 2 is that step (1) is omitted, and step (2) is changed to: adding 7 parts of montmorillonite to 249 parts of deionized water, stirring at 65°C and 200 rpm for 12 h, adding 4 parts of 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt, heating to 80°C, reacting for 9 h, centrifuging at 3000 r / min for 10 min, taking the solid, washing it 3 times with deionized water, and drying it in an oven at 60°C for 9 h to obtain modified montmorillonite. The remaining steps are the same as in Example 2.

[0030] Example of effect Table 1 below shows the performance analysis results of the impact-resistant polypropylene particles of Examples 1 to 3 and Comparative Examples 1 to 5 of the present invention.

[0031]

[0032] A comparison of the experimental data from Examples 1, 2, and 3 with Comparative Example 1 reveals that introducing large side groups into the main chain of allyl 3-hydroxymorpholine-4-carboxylic acid ester to form a non-coplanar structure reduces the interaction and close packing between polymer molecular chains, increases the distance between molecular chains and the free volume, enabling it to load more modified montmorillonite, improve shear resistance, and enhance the impact resistance of the plastic. Simultaneously, the morpholine structure can bind to bacteria and DNA, hindering their replication and leading to bacterial death, thus achieving an antibacterial effect. A comparison of the experimental data from Examples 1, 2, and 3 with Comparative Example 2 reveals that the longer thioether bond length in diallyl disulfide increases the space for chain segment movement, reduces the interaction and encapsulation between polymer chain segments, improves the flexibility of the polymer chain, and enhances the overall impact resistance. The experimental data from Examples 1, 2, and 3 with Comparative Example 3... Comparative analysis reveals that cross-linking the epoxy groups in modified montmorillonite with modified polyolefins can form a three-dimensional network structure, significantly improving impact resistance and mechanical strength. A comparison of experimental data from Examples 1, 2, and 3 with Comparative Example 4 shows that introducing sulfate ions using 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate prevents the plastic from undergoing a displacement reaction with acidic media, enhancing corrosion resistance. Simultaneously, the introduction of phenyl groups enhances the material's mechanical strength and improves wear resistance. A comparison of experimental data from Examples 1, 2, and 3 with Comparative Example 5 reveals that 2-allyloxyphenoxymethyl ethylene oxide also contains phenyl groups, which enhance the material's mechanical strength and improve wear resistance. Furthermore, the presence of epoxy groups facilitates cross-linking with functional groups in modified polyolefins, forming a three-dimensional network structure that improves impact resistance and wear resistance.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing impact-resistant polypropylene particles, characterized in that, The preparation steps include the following: Add 5-9 parts of montmorillonite to 178-320 parts of deionized water, stir at 60-70℃ and 200rpm for 10-14 hours, add 2-6 parts of modifier, heat to 70-90℃, react for 8-10 hours, centrifuge for 10 minutes, take the solid, wash it 3 times with deionized water, and dry it in an oven at 50-70℃ for 8-10 hours to obtain modified montmorillonite; Under nitrogen protection, 12-18 parts of allyl 3-hydroxymorpholine-4-carboxylic acid ester, 6-10 parts of diallyl disulfide, and 68-122 parts of toluene were mixed evenly. The rotation speed was adjusted to 100 rpm, and propylene gas was introduced to a certain pressure. 2-4 parts of catalyst were added, and the temperature was raised to 60-70℃. The reaction was carried out for 4-8 hours. During the reaction, propylene gas was continuously introduced to maintain a constant pressure. After the reaction was completed, air was introduced, and 24-36 parts of hydrochloric acid ethanol solution were added. The mixture was stirred for 40-60 minutes, and the solid was collected by suction filtration. The solid was washed three times with acetone and dried at 70-90℃ for 6-10 hours to obtain the modified polyolefin. Add 65-89 parts of polypropylene, 26-48 parts of modified montmorillonite, 51-77 parts of modified polyolefin, and 2-4 parts of stannous chloride to a mixer and mix for 30-40 minutes. Add 8-12 parts of stabilizer and 12-24 parts of filler and continue mixing for 10-20 minutes. Then, extrude the mixture in a twin-screw compounding extruder and pelletize it to obtain impact-resistant modified polypropylene granules.

2. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The method for preparing the modifier in step (1) is as follows: 17-23 parts of 4-hydroxy-3-methoxyphenylethylene glycol-4-sulfate potassium salt and 25-33 parts of 2-allyloxyphenoxymethyl ethylene oxide are mixed evenly, 1-5 parts of 10wt% potassium carbonate aqueous solution are added, and the mixture is reacted at 90-110℃ for 16-24h. The mixture is extracted three times with 98-134 parts of ethyl acetate, and the organic phase is concentrated at 35℃ and vacuum degree -0.08MPa for 2-4h to obtain the modifier.

3. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, In step (1), the centrifuge speed is 3000 r / min.

4. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The pressure mentioned in step (2) is 3 MPa.

5. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The catalyst in step (2) is one or a mixture of chromium-based catalysts, titanium-based catalysts, and vanadium-based catalysts.

6. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The concentration of hydrochloric acid in the hydrochloric acid ethanol solution in step (2) is 1 mol / L.

7. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The temperature of the mixer in step (3) is 130~150℃.

8. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The stabilizer mentioned in step (3) is one or more of sodium alginate, zinc stearate, and barium stearate.

9. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The filler in step (3) is one or a mixture of talc, calcium carbonate, kaolin, and cellulose.

10. The method for preparing impact-resistant polypropylene particles according to claim 1, characterized in that, The parameters of the twin-screw compounding extruder in step (3) are: head temperature 160~180℃, screw speed 130~210r / min, and extrusion pressure 5~11MPa.

Images