POLYPROPYLENE COMPOSITION, PREPARATION METHOD AND USE THEREOF

Abstract

A polypropylene composition comprising the following components in parts by weight: 40-99 parts of a polypropylene resin; 15-30 parts of an ethylene-α olefin copolymer; 0.2-1 part of an antimicrobial agent; and 1-3 parts of a polypropylene grafted polydimethylsiloxane is provided. By controlling a melt index of an elastomer, distribution of the modified polydimethylsiloxane and antimicrobial agent can be improved, thus improving antimicrobial and stain-resistant effects of the polypropylene composition.

Claims

1. A polypropylene composition, in parts by weight, comprising the following components: 40-99 parts of a polypropylene resin; 15-30 parts of an ethylene-α olefin copolymer; 0.2-1 part of an antimicrobial agent; and 1-3 parts of a polypropylene grafted polydimethylsiloxane.

2. The polypropylene composition according to claim 1, wherein in parts by weight, an amount of the antimicrobial agent is 0.2-0.4 parts.

3. The polypropylene composition according to claim 1, wherein the ethylene-α olefin copolymer is selected from at least one of ethylene-propylene copolymer, ethylene-hexene copolymer, ethylene-butene copolymer and ethylene-octene copolymer.

4. The polypropylene composition according to claim 3, wherein a melt index of the ethylene-α olefin copolymer is 5-30 g/10 min (190° C., 2.16 kg).

5. The polypropylene composition according to claim 1, wherein the antimicrobial agent is selected from at least one of zinc oxide, zeolite supported silver ion or glass-based supported silver ion.

6. The polypropylene composition according to claim 1, wherein the polypropylene grafted polydimethylsiloxane has a grafting ratio of 60%-80% and a molecular weight of 600,000-800,000.

7. The polypropylene composition according to claim 1, wherein in parts by weight, further comprising 0-30 parts of a filler; the filler is selected from at least one of talc, calcium carbonate, wollastonite, barium sulfate, mica, microsilica, silicon dioxide, magnesium hydroxide and montmorillonite.

8. The polypropylene composition according to claim 1, wherein in parts by weight, further comprising 0-10 parts of an auxiliary agent; the auxiliary agent is selected from at least one of a lubricant and a color powder.

9. A preparation method of the polypropylene composition of claim 1, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

10. Use of the polypropylene composition according to claim 1, wherein the polypropylene composition is used in applications of instrument panels, sub-instrument panels, uprights, glove boxes, door panels, door sills, air conditioner housings, and other automotive interior parts.

11. A preparation method of the polypropylene composition of claim 2, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

12. A preparation method of the polypropylene composition of claim 3, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

13. A preparation method of the polypropylene composition of claim 4, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

14. A preparation method of the polypropylene composition of claim 5, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

15. A preparation method of the polypropylene composition of claim 6, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

16. A preparation method of the polypropylene composition of claim 7, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

17. A preparation method of the polypropylene composition of claim 8, is weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1: an electron micrograph of surface of material with a filamentous network structure.

[0031] FIG. 2: an electron micrograph of surface of material without a filamentous network structure.

DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described below through specific implementations. The following embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited by the following embodiments.

[0033] Raw materials used in the present invention are as follows: [0034] Polypropylene: N-Z30S; [0035] Antimicrobial agent: silver ion antimicrobial agent BM-502FA, glass carrier; [0036] Ethylene-octene copolymer, melt index of 8 g/10 min (190° C., 2.16 kg), POE 8137; [0037] Ethylene-butene copolymer, melt index of 5 g/10 min (190° C., 2.16 kg), grade POE LC565; [0038] SEBS, melt index of 10 g/10 min (230° C., 2.16 kg), G1657 MS; [0039] OBC, melt index of 5 g/10 min (190° C., 2.16 kg), Infuse 9507; [0040] Polypropylene grafted polydimethylsiloxane A: grafting ratio of 63%, and molecular weight of about 680,000; [0041] Polypropylene grafted polydimethylsiloxane B: grafting ratio of 78%, and molecular weight of about 760,000; [0042] Polypropylene grafted polydimethylsiloxane C: grafting ratio of 43%, and molecular weight of about 570,000; [0043] Polydimethylsiloxane: TP-200, molecular weight of about 600,000; [0044] Talc: TYT-777A; [0045] Lubricant: zinc stearate; BS-2818; [0046] Color powder: carbon black; M717.

[0047] A preparation method of polypropylene composition of Embodiments and Comparative Examples: weighing each component according to a weight ratio, adding to a high-speed mixer and mixing for 1-3 minutes with a rotating speed being 1,000-2,000 rpm, to obtain a premix; melting and extruding the premix through a twin-screw extruder, with a temperature of each zone of the screw being 190-230° C., and granulating in vacuum to obtain the polypropylene composition.

Various Property Test Methods

[0048] The polypropylene composition was injection molded into a 100 cm*100 cm*3 mm square plate in an injection molding machine, and a stain-resistant property and an antimicrobial property of sample surface were tested.

[0049] (1) Stain-resistant property test: 2 drops of LAORENTOU liquid shoe polish are dropped on the sample surface, after dried at room temperature for 24 hours, wiped with gauze and it is evaluated as follows: completely wiped without leaving traces is grade 3; partially wiped is grade 2; completely not wiped is grade 1.

[0050] (2) Antimicrobial property test: According to JIS Z 2801:2012, it is evaluated as follows: obvious bacteriostasis is A, general bacteriostasis is B, and no bacteriostasis is C.

TABLE-US-00001 TABLE 1 Distribution ratio (in parts by weight) of each component of the polypropylene composition of Embodiments and test results of various properties Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Embodiment 6 Embodiment 7 Polypropylene 80 80 80 80 80 80 80 Antimicrobial agent 0.2 0.2 0.2 0.4 1 0.2 0.2 Ethylene-octene copolymer 20 20 20 20 15 30 Ethylene-butene copolymer 20 Polypropylene grafted 1 1 1 2 3 polydimethylsiloxane A Polypropylene grafted 1 polydimethylsiloxane B Polypropylene grafted 1 polydimethylsiloxane C Talc 15 15 15 15 15 15 15 Lubricant 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Color powder 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Stain-resistant property 3 3 2 3 3 3 3 Antimicrobial property A A B A A A A

[0051] It can be seen from Embodiments 1-3 that the grafting ratio of polypropylene grafted polydimethylsiloxane also affects a formation of filamentous network structure on the surface of the material. Within a preferred range of the grafting ratio, an antimicrobial effect is better.

TABLE-US-00002 TABLE 2 Distribution ratio (in parts by weight) of each component of the polypropylene composition of Comparative Examples and test results of various properties Comparative Comparative Comparative Comparative Comparative Comparative Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Polypropylene 80 80 80 80 80 80 Antimicrobial agent 0.2 0.2 0.2 0.2 0.2 0.2 Ethylene-octene copolymer 20 20 10 SEBS 20 20 OBC 20 Polypropylene grafted 1 1 1 polydimethylsiloxane A Polydimethylsiloxane 1 2 1 Talc 15 15 15 15 15 15 Lubricant 0.2 0.2 0.2 0.2 0.2 0.2 Color powder 0.5 0.5 0.5 0.5 0.5 0.5 Stain-resistant property 2 2 2 3 1 2 Antimicrobial property C C C C C C Comparative Comparative Example 7 Example 8 Polypropylene 80 80 Antimicrobial agent 0.2 0.2 Ethylene-octene copolymer 20 20 SEBS OBC Polypropylene grafted 0.3 5 polydimethylsiloxane A Polydimethylsiloxane Talc 15 15 Lubricant 0.2 0.2 Color powder 0.5 0.5 Stain-resistant property 1 3 Antimicrobial property C C

[0052] It can be seen from Comparative Example 1 or 2 or 5 that other types of elastomers cannot make the surface of the material have a significant filamentary network structure, so an antimicrobial effect is poor.

[0053] It can be seen from Comparative Example 3 or 4 that the polydimethylsiloxane without polypropylene grafted can obtain a good stain-resistant property by increasing an amount, but the antimicrobial property is very poor.

[0054] It can be seen from Comparative Example 6 that the amount of ethylene-α olefin copolymer will also affect formation of the filamentous network structure on the surface of the material and thus affect a bactericidal effect of the antimicrobial agent.

[0055] It can be seen from Comparative Example 7 or 8 that the amount of polypropylene grafted polydimethylsiloxane is too low, the surface of the material has a poor stain-resistant property, bacteria are easy to grow, and the antimicrobial property is comprehensively reduced. If the amount of polypropylene grafted polydimethylsiloxane is too high, it is easy to destroy the filamentous network structure on the surface of the material, instead reducing the antimicrobial property.