CN110655710A - Scratch-resistant impact-resistant polypropylene material and preparation method thereof - Google Patents
Scratch-resistant impact-resistant polypropylene material and preparation method thereof Download PDFInfo
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- CN110655710A CN110655710A CN201810698572.XA CN201810698572A CN110655710A CN 110655710 A CN110655710 A CN 110655710A CN 201810698572 A CN201810698572 A CN 201810698572A CN 110655710 A CN110655710 A CN 110655710A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/10—Peculiar tacticity
- C08L2207/14—Amorphous or atactic polypropylene
Abstract
The invention discloses a scratch-resistant impact-resistant polypropylene material and a preparation method thereof, wherein the scratch-resistant impact-resistant polypropylene material comprises the following components: polypropylene, a toughening agent, polyvinylidene fluoride, a plasticizer, a light stabilizer and an antioxidant; the polypropylene is random copolymerization polypropylene, the content of polyethylene in the components is more than or equal to 7 percent, and the tensile breaking elongation is more than or equal to 350 percent. According to the scratch-resistant impact-resistant polypropylene material prepared by the invention, the random copolymerization polypropylene material with high ductility and low crystallinity is used, so that the material has an excellent shearing-springback effect, and a certain amount of compounded toughening agent is added, so that the toughness of the material is further improved, and the scratch depth of the material when being scratched is reduced; meanwhile, the polyvinylidene fluoride component added into the material improves the smoothness of the surface of the material, reduces the frictional resistance and improves the scraping resistance of the material.
Description
Technical Field
The invention relates to the technical field of modified materials, in particular to a scratch-resistant impact-resistant polypropylene material and a preparation method thereof.
Background
Scratch resistance refers to the ability of a material to withstand visible scratches caused by external forces. When the resistance is not strong enough, the surface layer of the material is plastically deformed, and the surface is damaged to generate scratches. Polypropylene materials have been widely used in the fields of automobiles, electric appliances, daily necessities, and the like because of their excellent physical properties, and there is a trend toward new fields. However, the surface of polypropylene is easily scratched by external force, which greatly affects the appearance of the product, and the scratch generated on the surface of the product causes stress concentration, limiting its application. Therefore, the scratch resistance of the surface of the polypropylene composite material is improved, and the further development of the polypropylene material is facilitated.
At present, the approaches for improving the scratch resistance of polypropylene materials are mostly achieved by focusing on the ways of improving the surface hardness, improving the surface toughness and adding a scratch resistance auxiliary agent, but the methods usually add a large amount of other substances in an improper amount, seriously affect the performance of the materials and greatly increase the material cost. Therefore, the need to develop high-performance low-cost scratch-resistant polypropylene materials has been pressing.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a scratch-resistant impact-resistant polypropylene material with high performance and low cost and a preparation method thereof.
The technical scheme is as follows: the scratch-resistant impact-resistant polypropylene material comprises the following components in parts by weight:
the polypropylene is random copolymerization polypropylene, the content of polyethylene in the components is more than or equal to 7 percent, and the tensile breaking elongation is more than or equal to 350 percent.
Further, the toughening agent is linear low-density polyethylene, ethylene propylene diene monomer rubber and ethylene-octene graft copolymer, and the mass ratio of the toughening agent to the ethylene-octene graft copolymer is 1: 1: 2, and (2).
Further, the plasticizer is polypropylene wax, polyethylene wax or a mixture of the polypropylene wax and the polyethylene wax in a mass ratio of 1: 1.
Further, the light stabilizer is a hindered amine ultraviolet absorber.
Further, the antioxidant is at least three of pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010), n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (1076), tris- (2, 4-di-tert-butylphenyl) phosphite (168) and dioctadecyl thiodipropionate (DSTDP).
A preparation method of a scratch-resistant impact-resistant polypropylene material comprises the following steps: 75-85 parts of polypropylene, 10-15 parts of a toughening agent, 5-10 parts of polyvinylidene fluoride and 0.1-0.3 part of a plasticizer; 0.1-0.3 part of light stabilizer; adding 0.4-0.6 part of antioxidant into a high-speed mixer to mix for 10 min; and adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain the scratch-resistant impact-resistant polypropylene material granules.
Further, the extrusion temperature of each extrusion zone in the twin-screw extruder is 150-.
The invention has the advantages that: the polypropylene is random copolymerization polypropylene, the content of polyethylene in the components is more than or equal to 7 percent, and the tensile breaking elongation is more than or equal to 350 percent; the performance test of the prepared material shows that the tensile strength, the tensile elongation at break, the flexural modulus, the notch impact strength, the Rockwell strength and the scratch resistance of the material are all obviously improved; has an important role in preparing the granules of the scratch-resistant impact-resistant polypropylene material in the application.
The tensile strength, the bending modulus, the notch impact strength and the scratch resistance of the material prepared by the method can be improved by adding the polyvinylidene fluoride;
the compounded toughening agent can obviously improve the tensile breaking elongation, the notch impact strength and the scratch resistance of the material.
The scratch resistance test result of the material obtained by the invention is 0.21-0.29; compared with the results of 1-3, the material prepared by the method has excellent scratch resistance, and the scratch resistance of the material is rapidly reduced when a block copolymerization polypropylene material with higher crystallinity is used as a base material; the polyvinylidene fluoride added in the base material obviously improves the scratch resistance of the final material, and the toughening agent improves the mechanical property of the material. According to the scratch-resistant impact-resistant polypropylene material prepared by the invention, the random copolymerization polypropylene material with high ductility and low crystallinity is used, so that the material has an excellent shearing-springback effect, and a certain amount of compounded toughening agent is added, so that the toughness of the material is further improved, and the scratch depth of the material when being scratched is reduced; meanwhile, the polyvinylidene fluoride component added into the material improves the smoothness of the surface of the material, reduces the frictional resistance and improves the scraping resistance of the material.
Detailed Description
In the embodiment, the polypropylene is random copolymerization polypropylene, the content of polyethylene in the components is more than or equal to 7 percent, and the tensile breaking elongation is more than or equal to 350 percent;
in the embodiment, the toughening agent is linear low-density polyethylene, ethylene propylene diene monomer rubber and ethylene-octene graft copolymer, and the mass ratio of the toughening agent to the ethylene-octene graft copolymer is 1: 1: 2, mixing;
in the embodiment, the plasticizer is polypropylene wax or polyethylene wax or both of the polypropylene wax and the polyethylene wax in a mass ratio of 1: 1, mixing;
in the embodiment, the light stabilizer is a hindered amine ultraviolet absorber;
in the embodiment, the antioxidant is at least three of pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (1010), n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (1076), tris- (2, 4-di-tert-butylphenyl) phosphite (168) and dioctadecyl thiodipropionate (DSTDP).
Example 1
Adding 75 parts of polypropylene, 15 parts of toughening agent, 10 parts of polyvinylidene fluoride, 0.1 part of plasticizer, 0.1 part of light stabilizer and 0.4 part of antioxidant into a high-speed mixer for mixing for 10 min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain scratch-resistant and impact-resistant polypropylene material granules; wherein the extrusion temperatures of the extrusion zones in the twin-screw extruder are respectively 150 ℃, 160 ℃, 175 ℃, 185 ℃, 190 ℃ and 200 ℃.
Example 2
Adding 80 parts of polypropylene, 10 parts of toughening agent, 10 parts of polyvinylidene fluoride, 0.3 part of plasticizer, 0.3 part of light stabilizer and 0.6 part of antioxidant into a high-speed mixer for mixing for 10 min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain scratch-resistant and impact-resistant polypropylene material granules; wherein the extrusion temperatures of the extrusion zones in the twin-screw extruder are 155 ℃, 165 ℃, 170 ℃, 190 ℃, 195 ℃, 205 ℃ respectively.
Example 3
Adding 85 parts of polypropylene, 10 parts of toughening agent, 5 parts of polyvinylidene fluoride, 0.2 part of plasticizer, 0.2 part of light stabilizer and 0.5 part of antioxidant into a high-speed mixer for mixing for 10 min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain scratch-resistant and impact-resistant polypropylene material granules; wherein the extrusion temperatures of the extrusion zones in the twin-screw extruder are 160 ℃, 175 ℃, 185 ℃, 195 ℃, 200 ℃, 210 ℃ respectively.
Comparative example 1
Adding 80 parts of block copolymerization polypropylene (polyethylene content: 4%, tensile elongation at break: 70%), 10 parts of toughening agent, 10 parts of polyvinylidene fluoride, 0.2 part of plasticizer, 0.2 part of light stabilizer and 0.5 part of antioxidant into a high-speed mixer for mixing for 10 min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain scratch-resistant and impact-resistant polypropylene material granules; wherein the extrusion temperatures of the extrusion zones in the twin-screw extruder are 155 ℃, 165 ℃, 170 ℃, 190 ℃, 195 ℃, 205 ℃ respectively.
Comparative example 2
Adding 90 parts of polypropylene, 10 parts of toughening agent, 0.2 part of plasticizer, 0.2 part of light stabilizer and 0.5 part of antioxidant into a high-speed mixer to mix for 10 min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain scratch-resistant and impact-resistant polypropylene material granules; wherein the extrusion temperatures of the extrusion zones in the twin-screw extruder are 155 ℃, 165 ℃, 170 ℃, 190 ℃, 195 ℃, 205 ℃ respectively.
Comparative example 3
Adding 85 parts of polypropylene, 5 parts of polyvinylidene fluoride, 10 parts of ethylene-octene copolymer toughening agent, 0.2 part of plasticizer, 0.2 part of light stabilizer and 0.5 part of antioxidant into a high-speed mixer for mixing for 10 min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain scratch-resistant and impact-resistant polypropylene material granules; wherein the extrusion temperatures of the extrusion zones in the twin-screw extruder are 155 ℃, 165 ℃, 170 ℃, 190 ℃, 195 ℃, 205 ℃ respectively.
The main physical property indexes of the polypropylene composite materials prepared in the above examples 1 to 3 and comparative examples 1 to 3 were measured according to the relevant test standards, and the test standards and test results of the tensile strength, tensile elongation at break, flexural modulus, Izod notched impact strength, rockwell hardness, scratch resistance Δ L are shown in the following table 1:
TABLE 1 results of tests on the main physical properties of the materials obtained in examples 1 to 3 and comparative examples 1 to 3
As can be seen from the above, the difference between the example 2 of the present invention and the example 1 is that the polypropylene used in the present invention is random copolymerized polypropylene, the content of polyethylene in the components is more than or equal to 7%, and the tensile elongation at break is more than or equal to 350%; the polypropylene in the 1 is polyethylene content of 4 percent, and the tensile elongation at break is 70 percent; the performance test of the prepared material shows that the tensile strength, the tensile elongation at break, the flexural modulus, the notch impact strength, the Rockwell strength and the scratch resistance of the material are all obviously improved; therefore, the random copolymerization polypropylene selected by the application has the components with the polyethylene content being more than or equal to 7 percent and the tensile breaking elongation being more than or equal to 350 percent, and has important function for preparing the scratch-resistant impact-resistant polypropylene material granules.
Example 2 is compared with comparative example 2, and the difference is whether polyvinylidene fluoride is contained, 10 parts of polyvinylidene fluoride are contained in the application, and polyvinylidene fluoride is not contained in the case of 1; according to the performance test, the tensile strength, the bending modulus, the notch impact strength and the scratch resistance of the material prepared by the method are better than those of the material prepared by the method 2;
example 3 of the present application differs from pair 3 in whether the toughening agent is formulated. The tensile elongation at break, the notch impact strength and the scratch resistance of the compound toughening agent in the embodiment 3 are all obviously superior to those of the embodiment 3, and therefore, the compound toughening agent has the beneficial effects of enhancing the tensile elongation at break, increasing the notch impact strength and reducing the scratch resistance coefficient.
The scratch resistance test result of the material obtained by the invention is 0.21-0.29; compared with the results of 1-3, the material prepared by the method has excellent scratch resistance, and the scratch resistance of the material is rapidly reduced when a block copolymerization polypropylene material with higher crystallinity is used as a base material; the polyvinylidene fluoride added in the base material obviously improves the scratch resistance of the final material, and the toughening agent improves the mechanical property of the material.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. A scratch-resistant impact-resistant polypropylene material, which is characterized in that: the composition comprises the following components in parts by weight:
75-85 parts of polypropylene;
10-15 parts of a toughening agent;
5-10 parts of polyvinylidene fluoride;
0.1-0.3 part of plasticizer;
0.1-0.3 part of light stabilizer;
0.4-0.6 part of antioxidant;
the polypropylene is random copolymerization polypropylene, the content of polyethylene in the components is more than or equal to 7 percent, and the tensile breaking elongation is more than or equal to 350 percent.
2. The scratch resistant impact polypropylene material of claim 1, characterized in that: the toughening agent is linear low-density polyethylene, ethylene propylene diene monomer rubber and ethylene-octene graft copolymer, and the mass ratio of the toughening agent to the ethylene-octene graft copolymer is 1: 1: 2, and (2).
3. The scratch resistant impact polypropylene material of claim 1, characterized in that: the plasticizer is polypropylene wax, polyethylene wax or a mixture of the polypropylene wax and the polyethylene wax in a mass ratio of 1: 1.
4. The scratch resistant impact polypropylene material of claim 1, characterized in that: the light stabilizer is a hindered amine ultraviolet light absorber.
5. The scratch resistant impact polypropylene material of claim 1, characterized in that: the antioxidant is at least three of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tris- (2, 4-di-tert-butylphenyl) phosphite and dioctadecyl thiodipropionate.
6. The process for preparing a scratch resistant impact resistant polypropylene material according to any one of claims 1 to 5, wherein: the method comprises the following steps: 75-85 parts of polypropylene, 10-15 parts of a toughening agent, 5-10 parts of polyvinylidene fluoride and 0.1-0.3 part of a plasticizer; 0.1-0.3 part of light stabilizer; 0.4-0.6 part of antioxidant; adding into a high-speed mixer for mixing; and adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain the scratch-resistant impact-resistant polypropylene material granules.
7. The method for preparing a scratch resistant impact polypropylene material according to claim 6, characterized in that: the extrusion temperature of each extrusion zone in the double-screw extruder is respectively 150-.
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Cited By (3)
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| CN113004832A (en) * | 2021-02-04 | 2021-06-22 | 临海伟星新型建材有限公司 | Preparation method of adhesive for PVDF (polyvinylidene fluoride) composite pipe |
| CN113372651A (en) * | 2021-07-16 | 2021-09-10 | 北海市传创环保科技有限公司 | High-strength and high-toughness polypropylene injection molding material |
| CN115056557A (en) * | 2022-07-27 | 2022-09-16 | 日丰企业(天津)有限公司 | High-impact anti-fouling antibacterial PPR pipe and preparation method thereof |
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