CN115216083A - Long-acting anti-aging polypropylene composite material and preparation method thereof - Google Patents
Long-acting anti-aging polypropylene composite material and preparation method thereof Download PDFInfo
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- 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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- 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
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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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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
- C08L2205/242—Beta spherulite nucleating agents
Abstract
The invention discloses a long-acting anti-aging polypropylene composite material and a preparation method thereof, wherein the long-acting anti-aging polypropylene composite material comprises the following components in parts by weight: 45-55 parts of homopolymerized polypropylene, 12-30 parts of copolymerized polypropylene, 10-20 parts of toughening agent, 0.6-1 part of fullerene, 0.5-1 part of beta-nucleating agent, 10-20 parts of inorganic filler, 0.1-0.2 part of antioxidant and 0.2 part of light stabilizer; the fullerene is C60 fullerene, and the beta-nucleating agent comprises any one of rare earth compounds, aromatic amide compounds and carboxylate compounds, and is prepared by drying, mixing, melting and extruding. The long-acting aging-resistant polypropylene composite material provided by the invention can effectively improve the long-acting aging resistance of a polypropylene material, improve the appearance quality of automobile parts and improve the product competitiveness.
Description
Technical Field
The invention relates to the technical field of high polymer materials, and particularly relates to a long-acting anti-aging polypropylene composite material and a preparation method thereof.
Background
Polypropylene (PP) has the characteristics of small density, high strength, good chemical resistance, good processing technology and the like, and has become the most common plastic applied in the automobile industry in recent years. However, as the service life of the automobile increases, the interior and exterior parts made of polypropylene materials in the automobile are susceptible to the action of light, heat, oxygen and the like to accelerate aging, so that the appearance quality of the interior and exterior parts is deteriorated, the attractiveness of the automobile parts is seriously affected, and even the public praise and sales volume of the automobile are adversely affected.
Aiming at the problems, the traditional solution is to add various additives such as light stabilizers, heat stabilizers and the like in the processing process of the polypropylene composite material to improve the anti-aging performance of the polypropylene composite material. However, with the increasingly stringent requirements for energy saving and cost reduction in the automobile industry, automobile parts develop towards thinning and modularization, and the parts with thin wall thickness, large area and complex structure are often required to be molded at a higher temperature, and excessive temperature can cause degradation of polypropylene materials, so that a large amount of aging-resistant additives can be consumed in advance, long-acting aging resistance of the polypropylene materials can be affected, mechanical properties of the parts made of the polypropylene materials are reduced, the surface of the parts is whitened, tiger skin wrinkles and other defects occur, and appearance quality of the automobile parts is seriously affected.
Disclosure of Invention
In view of the above, the invention aims to provide a long-acting aging-resistant polypropylene composite material and a preparation method thereof, and the prepared polypropylene composite material has long-acting aging resistance and can improve the appearance quality of automobile parts.
In one aspect of the invention, a long-acting aging-resistant polypropylene composite is provided. According to some embodiments of the invention, the long-acting aging-resistant polypropylene composite material comprises the following components in parts by weight:
45-55 parts of homopolymerized polypropylene, 12-30 parts of copolymerized polypropylene, 10-20 parts of toughening agent, 0.6-1 part of fullerene, 0.5-1 part of beta-nucleating agent, 10-20 parts of inorganic filler, 0.1-0.2 part of antioxidant and 0.2 part of light stabilizer;
wherein the fullerene is C60 fullerene, and the beta-nucleating agent comprises any one of rare earth compounds (such as WBG-II), aromatic amide compounds (such as TMB-5) and carboxylate compounds (such as NT-C).
The fullerene has extremely excellent free radical trapping capacity, and can effectively inhibit the aging behavior of polypropylene caused by free radicals when added into the polypropylene composite material. Meanwhile, as the fullerene can form a gel sphere network after capturing free radicals, the gel sphere network can enhance the melt viscosity and improve the thermal stability of the polypropylene under the high-temperature condition.
The beta-nucleating agent has the function of converting an alpha-crystal form in polypropylene (PP) into a beta-crystal form of a crystal transformation agent, the mechanical property and the thermal deformation temperature of the polypropylene can be improved along with the increase of the proportion of the beta-crystal form in the polypropylene, and the diffusion of oxygen molecules can be inhibited by the special crystal structure, so that the aging resistance of the polypropylene can be improved.
In some embodiments of the present disclosure, the homopolypropylene has a melt flow rate of 20 to 50g/10min at 230 ℃ under a test condition of 2.16 kg.
In some embodiments of the invention, the co-polypropylene has a melt flow rate of 5 to 20g/10min at 230 ℃ under 2.16kg test conditions.
In some embodiments of the present invention, the toughening agent comprises at least one of POE elastomer, EPDM elastomer. The POE elastomer is specifically a polyolefin thermoplastic elastomer, and the EPDM elastomer is specifically an ethylene propylene diene monomer elastomer.
In some embodiments of the invention, the inorganic filler comprises at least one of talc, montmorillonite, calcium carbonate. The particle size of the talcum powder is 1250-5000 meshes, and the particle size of the calcium carbonate is 1250-5000 meshes.
In some embodiments of the invention, the antioxidant comprises at least one of antioxidant 1076, antioxidant 300, antioxidant 168, antioxidant 1010. The antioxidant 1076 is specifically n-octadecyl beta- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, the antioxidant 300 is specifically 4,4' -thiobis (6-tert-butyl-3-methylphenol), the antioxidant 168 is specifically tris [2,4-di-tert-butylphenyl ] phosphite, and the antioxidant 1010 is specifically pentaerythrityl tetrakis [ beta- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate ].
In some embodiments of the invention, the light stabilizer comprises at least one of light stabilizer 770, light stabilizer 944, UV-326, UV-327, UV-234. The light stabilizer 770 is in particular bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, the light stabilizer 944 is in particular poly [ [6- [ (1,1,3,3-tetramethylbutyl) amine ] -1,3,5-triazine-2,4-diyl ] [ (2,2,6,6-tetramethyl-4-piperidine) imine ] -1,6-diadipyl [ (2,2,6,6-tetramethyl-4-piperidine) imine ] ] ], the UV-326 is in particular 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole, the UV-327 is in particular 2- (2 '-hydroxy-3', 5 '-di-tert-butylphenyl) -5-chlorobenzotriazole, and the UV-234 is in particular 2- (2' -hydroxy-3 ',5' -bis (a, a-dimethylbenzyl) phenyl) benzotriazole.
The invention utilizes the unique action of the fullerene and the beta-nucleating agent, adds the fullerene and the beta-nucleating agent into the polypropylene composite material, solves the problems of the polypropylene composite material such as the reduction of the mechanical property of parts of a polypropylene material, the serious reduction of the appearance quality and the like caused by overhigh processing temperature, and effectively improves the long-acting aging resistance of the polypropylene composite material. In addition, the beta nucleating agent can efficiently induce PP to generate a large amount of beta crystal forms, so that PP is promoted to be converted from brittleness to toughness to play a toughening role, the toughening effect is obvious even if the using amount of the toughening agent is reduced, and the use cost of the toughening agent can be obviously reduced.
In a second aspect, the invention provides a method for preparing the long-acting aging-resistant polypropylene composite material. According to some embodiments of the invention, the method comprises:
(1) Mixing the homopolymerized polypropylene, the copolymerized polypropylene and the toughening agent, and drying to obtain a first mixture;
(2) Uniformly mixing the first mixture obtained in the step (1), fullerene, beta-nucleating agent, inorganic filler, antioxidant and light stabilizer by a high-speed mixer to obtain a second mixture;
(3) And (3) melting, blending and extruding the second mixture obtained in the step (2) by a double-screw extruder to obtain the long-acting aging-resistant polypropylene composite material.
In some embodiments of the present invention, the drying temperature in step (1) is 60 to 120 ℃ and the drying time is 2 to 8 hours.
In some embodiments of the present invention, in the step (2), the mixing conditions of the high-speed mixer are: the rotating speed is 1500-3000 r/min, and the stirring time is 3-10 min.
In some embodiments of the present invention, in the step (3), the conditions of the melt extrusion in the twin-screw extruder are: the temperature of the first zone is 100-170 ℃, the temperature of the second zone is 160-190 ℃, the temperature of the third zone is 170-200 ℃, the temperature of the fourth zone is 170-210 ℃, the temperature of the fifth zone is 180-220 ℃, the temperature of the sixth zone is 200-230 ℃, and the rotating speed of the screw is 200-500r/min, wherein the first zone and the second zone are feeding zones, the third zone, the fourth zone and the fifth zone are melting zones, and the sixth zone is a homogenizing zone.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Detailed Description
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way. The reagents described in the examples are commercially available without specific reference.
Example 1
The composition comprises the following components in percentage by mass:
weighing 45 parts of homopolymerized polypropylene, 20 parts of copolymerized polypropylene and 20 parts of POE elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at the rotating speed of 2000r/min for 3min, adding 15 parts of talcum powder (the mesh number is 2000 meshes), 1 part of fullerene, 0.5 part of aromatic amide beta-nucleating agent (TMB-5), 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and continuously stirring the mixture at the rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added to increase the bonding force between a polypropylene material (particle shape) and an inorganic filler (powder shape), and the final product performance is not obviously influenced due to the fact that the adding amount of the white oil is very small;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
Example 2
The composition comprises the following components in percentage by mass:
weighing 50 parts of homopolymerized polypropylene, 15 parts of copolymerized polypropylene and 20 parts of POE elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at the rotating speed of 2000r/min for 3min, adding 15 parts of talcum powder (the mesh number is 2000 meshes), 1 part of fullerene, 0.6 part of aromatic amide beta-nucleating agent (TMB-5), 0.2 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and continuously stirring the mixture at the rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added to increase the bonding force between a polypropylene material (granular) and an inorganic filler (powdery), so that the final product performance is not obviously influenced due to the extremely small addition amount of the white oil;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃ and the rotating speed of the screw is 300r/min.
Example 3
The composition comprises the following components in percentage by mass:
weighing 48 parts of homopolymerized polypropylene, 20 parts of copolymerized polypropylene and 20 parts of EPDM elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at the rotating speed of 2000r/min for 3min, adding 15 parts of talcum powder (the mesh number is 1250 meshes), 0.6 part of fullerene, 0.6 part of rare earth compound beta-nucleating agent (WBG-II), 0.1 part of antioxidant 1076, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and stirring the mixture in the high-speed mixer at the rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added to increase the bonding force between a polypropylene material (particle shape) and an inorganic filler (powder shape), and the final product performance is not obviously influenced due to the addition amount of the white oil;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
Example 4
The composition comprises the following components in percentage by mass:
weighing 48 parts of homopolymerized polypropylene, 12 parts of copolymerized polypropylene and 20 parts of EPDM (ethylene-propylene-diene monomer) elastomer, mixing, and drying for 4 hours at 80 ℃ to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at the rotating speed of 2000r/min for 3min, then adding 20 parts of talcum powder (the mesh number is 2000), 0.8 part of fullerene, 1 part of aromatic amide beta-nucleating agent (TMB-5), 0.1 part of antioxidant 1076, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 944, and stirring the mixture in the high-speed mixer at the rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added to increase the bonding force between a polypropylene material (particle shape) and an inorganic filler (powder shape), and the final product performance is not obviously influenced due to the fact that the adding amount of the white oil is very small;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
Example 5
The composition comprises the following components in percentage by mass:
weighing 40 parts of homopolymerized polypropylene, 30 parts of copolymerized polypropylene and 15 parts of POE elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at a rotating speed of 2000r/min for 3min, adding 15 parts of calcium carbonate (the particle size is 2000 meshes), 1 part of fullerene, 1 part of aromatic amide beta-nucleating agent (TMB-5), 0.1 part of antioxidant 1076, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 944, and continuously stirring the mixture at a rotating speed of 1500r/min for 10min to obtain a second mixture;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
Example 6
The composition comprises the following components in percentage by mass:
weighing 55 parts of homopolymerized polypropylene, 25 parts of copolymerized polypropylene and 10 parts of POE elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture for 3min at the rotating speed of 2000r/min in a high-speed mixer, adding 10 parts of calcium carbonate (the particle size is 2000 meshes), 1 part of fullerene, 1 part of aromatic amide beta-nucleating agent (TMB-5), 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 944, and stirring the mixture for 10min at the rotating speed of 1500r/min in the high-speed mixer to obtain a second mixture, wherein the white oil is added to increase the bonding force between a polypropylene material (particle) and an inorganic filler (powder), and the final product performance is not obviously influenced because the addition amount of the white oil is very small;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃ and the rotating speed of the screw is 300r/min.
Comparative example 1
The composition comprises the following components in percentage by mass:
weighing 45 parts of homopolymerized polypropylene, 20 parts of copolymerized polypropylene and 20 parts of POE elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at the rotating speed of 2000r/min for 3min, adding 15 parts of talcum powder (the mesh number is 2000 meshes), 0.5 part of aromatic amide beta-nucleating agent (TMB-5), 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and continuously stirring the mixture at the rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added for increasing the bonding force between a polypropylene material (particle shape) and an inorganic filler (powder shape), and the final product performance is not obviously influenced due to the small addition amount of the white oil;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
Comparative example 2
The composition comprises the following components in percentage by mass:
weighing 50 parts of homopolymerized polypropylene, 15 parts of copolymerized polypropylene and 20 parts of POE elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at a rotating speed of 2000r/min for 3min, adding 15 parts of talcum powder (the mesh number is 2000 meshes), 1 part of fullerene, 0.2 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and continuously stirring the mixture at a rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added for increasing the bonding force between a polypropylene material (particle shape) and an inorganic filler (powder shape), and the final product performance cannot be obviously influenced due to the addition amount of the white oil is very small;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
Comparative example 3
The composition comprises the following components in percentage by mass:
weighing 48 parts of homopolymerized polypropylene, 20 parts of copolymerized polypropylene and 20 parts of EPDM elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture in a high-speed mixer at a rotating speed of 2000r/min for 3min, adding 15 parts of talcum powder (with the mesh number of 1250 meshes), 0.1 part of antioxidant 1076, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and stirring the mixture in the high-speed mixer at a rotating speed of 1500r/min for 10min to obtain a second mixture, wherein the white oil is added for increasing the bonding force between a polypropylene material (particle shape) and an inorganic filler (powder shape), and the final product performance cannot be obviously influenced due to the addition amount of the white oil is very small;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃ and the rotating speed of the screw is 300r/min.
Comparative example 4
The composition comprises the following components in percentage by mass:
weighing 48 parts of homopolymerized polypropylene, 20 parts of copolymerized polypropylene and 15 parts of EPDM (ethylene-propylene-diene monomer) elastomer, mixing, and drying at 80 ℃ for 4 hours to obtain a first mixture; weighing 0.3 part of white oil, adding the white oil into the first mixture, stirring the mixture for 3min at the rotating speed of 2000r/min in a high-speed mixer, adding 15 parts of talcum powder (with the mesh number being 1250 meshes), 0.6 part of fullerene, 1.5 parts of rare earth compound beta-nucleating agent (WBG-II), 0.1 part of antioxidant 1076, 0.1 part of antioxidant 168 and 0.2 part of light stabilizer 770, and stirring the mixture for 10min at the rotating speed of 1500r/min in the high-speed mixer to obtain a second mixture, wherein the white oil is added to increase the bonding force between a polypropylene material (granular) and an inorganic filler (powder), so that the final product performance is not obviously influenced due to the extremely small addition amount of the white oil;
and melting, blending, extruding and granulating the second mixture by a double-screw extruder to obtain a final product. Wherein the conditions of the melt extrusion of the double-screw extruder are as follows: the first zone is 150 ℃, the second zone is 170 ℃, the third zone is 180 ℃, the fourth zone is 190 ℃, the fifth zone is 200 ℃, the sixth zone is 220 ℃, and the rotating speed of the screw is 300r/min.
TABLE 1 formulation of Polypropylene composite compositions of examples 1-6 and comparative examples 1-4
The final products obtained in examples 1 to 6 and comparative examples 1 to 4 were tested and evaluated for their aging resistance according to the following test methods and performance criteria:
and (3) testing conditions are as follows: the xenon lamp test is carried out according to PV 3930. The total test time is 2000h, and the test is performed in 500h, 1000h, 1500h and 2000 h; the color difference was calculated according to ISO 7724-3. The values of the color difference and appearance obtained by the test are shown in the following table 2.
TABLE 2 Long-term aging resistance of examples 1 to 6 and comparative examples 1 to 4
As can be seen from Table 2, compared with comparative example 1 and example 1, the color difference value of the final product after the aging resistance test of 2000h is obviously increased without adding fullerene, the appearance is obviously changed, and even the whitening phenomenon is generated; compared with the comparative example 2 and the example 2, under the condition of not adding the beta-nucleating agent, the color difference value of the final product is increased and the appearance is obviously changed after the final product is subjected to the aging resistance test of 2000 h; compared with the comparative example 3 and the example 3, under the condition that neither fullerene nor beta nucleating agent is added, the final product undergoes the aging resistance test for 2000h, the color difference value is obviously increased, the appearance is seriously changed, and the phenomena of tiger skin lines and cracking even appear, which indicates that the aging resistance of the product can be obviously improved by adding the fullerene and the beta nucleating agent.
Therefore, the long-acting aging-resistant polypropylene material and the preparation method thereof provided by the invention can improve the long-acting aging resistance of the product, improve the appearance quality of automobile parts and improve the product competitiveness.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The long-acting aging-resistant polypropylene composite material is characterized by comprising the following components in parts by weight:
45-55 parts of homopolymerized polypropylene, 12-30 parts of copolymerized polypropylene, 10-20 parts of toughening agent, 0.6-1 part of fullerene, 0.5-1 part of beta-nucleating agent, 10-20 parts of inorganic filler, 0.1-0.2 part of antioxidant and 0.2 part of light stabilizer;
the fullerene is C60 fullerene, and the beta-nucleating agent comprises any one of rare earth compounds, aromatic amide compounds and carboxylate compounds.
2. The long-acting aging-resistant polypropylene composite material according to claim 1, wherein the melt flow rate of the homo-polypropylene is 20 to 50g/10min at 230 ℃ under a test condition of 2.16 kg.
3. The long-acting aging-resistant polypropylene composite material of claim 1, wherein the melt flow rate of the polypropylene copolymer is 5 to 20g/10min at 230 ℃ under a test condition of 2.16 kg.
4. The long-term aging-resistant polypropylene composite of claim 1, wherein the toughening agent comprises at least one of a POE elastomer, an EPDM elastomer.
5. The long-acting aging-resistant polypropylene composite of claim 1, wherein the inorganic filler comprises at least one of talc, montmorillonite, and calcium carbonate.
6. The long-acting aging-resistant polypropylene composite material of claim 5, wherein the talc powder has a particle size of 1250 to 5000 mesh, and the calcium carbonate is ground calcium carbonate having a particle size of 1250 to 5000 mesh.
7. The long-acting aging-resistant polypropylene composite material of claim 1, wherein the antioxidant comprises at least one of antioxidant 1076, antioxidant 300, antioxidant 168, and antioxidant 1010.
8. The long-acting aging resistant polypropylene composite of claim 1, wherein the light stabilizer comprises at least one of light stabilizer 770, light stabilizer 944, UV-326, UV-327, and UV-234.
9. A method for preparing the long-acting aging-resistant polypropylene composite material according to any one of claims 1 to 8, comprising the steps of:
mixing the homopolymerized polypropylene, the copolymerized polypropylene and the toughening agent, and drying to obtain a first mixture;
uniformly mixing the obtained first mixture, fullerene, beta-nucleating agent, inorganic filler, antioxidant and light stabilizer by a high-speed mixer to obtain a second mixture;
and melting, blending and extruding the obtained second mixture by a double-screw extruder to obtain the long-acting aging-resistant polypropylene composite material.
10. The preparation method of the long-acting aging-resistant polypropylene composite material as claimed in claim 9, wherein the drying temperature is 60-120 ℃ and the drying time is 2-8 h; the mixing conditions of the high-speed mixer are as follows: the rotating speed is 1500-3000 r/min, and the stirring time is 3-10 min; the conditions of melt extrusion in the twin-screw extruder are as follows: the first zone is 100-170 ℃, the second zone is 160-190 ℃, the third zone is 170-200 ℃, the fourth zone is 170-210 ℃, the fifth zone is 180-220 ℃, the sixth zone is 200-230 ℃, the screw rotation speed is 200-500r/min, the first zone and the second zone are feeding zones, the third zone, the fourth zone and the fifth zone are melting zones, and the sixth zone is a homogenizing zone.
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| CN101067032A (en) * | 2007-06-11 | 2007-11-07 | 浙江大学 | Compositely modified polypropylene and its prepn process |
| CN101696254A (en) * | 2009-10-23 | 2010-04-21 | 中国科学院长春应用化学研究所 | Method for improving melt strength of polypropylene by using fullerene |
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