CN108276680B - Modified polypropylene composite material and preparation method thereof - Google Patents

Modified polypropylene composite material and preparation method thereof Download PDF

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Publication number
CN108276680B
CN108276680B CN201810192383.5A CN201810192383A CN108276680B CN 108276680 B CN108276680 B CN 108276680B CN 201810192383 A CN201810192383 A CN 201810192383A CN 108276680 B CN108276680 B CN 108276680B
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composite material
polypropylene composite
titanium dioxide
temperature
nano titanium
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CN108276680A (en
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韩锐
李光照
彭必友
彭婷
王中最
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Guangdong Hengjia Rubber And Plastic Technology Co ltd
Sichuan Qianyiding Technology Co ltd
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Xihua University
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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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
    • C08J3/2053—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the additives only being premixed with a liquid phase
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • C08K2201/011—Nanostructured additives

Abstract

The invention discloses a modified polypropylene composite material and a preparation method thereof, wherein the method comprises the following steps: mixing attapulgite and nano titanium dioxide, adding absolute ethyl alcohol and a solubilizer, and performing ultrasonic dispersion to obtain an ultrasonic dispersion; and adding the ultrasonic dispersion into polypropylene, mixing, extruding, granulating and drying to obtain the polypropylene composite material. According to the invention, attapulgite and nano titanium dioxide are mixed, absolute ethyl alcohol and a solubilizer are added, and then ultrasonic dispersion is carried out, so that polypropylene can be effectively modified by the ultrasonic dispersion, and the original mechanical property of polypropylene can be effectively improved while the ultraviolet aging resistance of the polypropylene composite material is improved.

Description

Modified polypropylene composite material and preparation method thereof
Technical Field
The invention belongs to the technical field of polypropylene composite materials, and particularly relates to a modified propylene composite material and a preparation method thereof.
Background
The polypropylene (PP) has good mechanical property and processability, and has the advantages of simple synthesis method, rich raw material source, low price and wide application field. However, due to the existence of tertiary carbon atoms with high chemical activity, polypropylene materials are easy to age under ultraviolet irradiation, resulting in performance degradation, so that polypropylene needs to be modified to make up for the deficiency of ultraviolet aging resistance.
At present, the ultraviolet aging resistance of a polypropylene material is improved by adding montmorillonite, but the influence of the addition amount on the mechanical property of the polypropylene material is large, when the content of the montmorillonite is low, the modulus and the impact strength of the polypropylene can be improved, but with the increase of the content of the filler, the reinforcing effect cannot be achieved, and the mechanical property is reduced. In addition, the ultraviolet aging resistance of polypropylene can be enhanced by adding mica, but the impact toughness is reduced.
Therefore, it is a problem to be solved to further improve the ultraviolet aging resistance and mechanical properties of polypropylene modified by adding proper additives.
Attapulgite is a water-containing magnesium-rich aluminosilicate clay mineral with a layer chain structure, has a special fiber and porous structure, shows unusual colloid and adsorption performance, can be used as a carrier, a thickening agent, an air purifying agent and the like, but the ultraviolet aging resistance of polypropylene is improved by utilizing the synergistic effect of attapulgite at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a modified polypropylene composite material and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide, adding absolute ethyl alcohol and a solubilizer, and performing ultrasonic dispersion to obtain an ultrasonic dispersion;
(2) adding the ultrasonic dispersion into polypropylene for mixing, and then extruding, granulating and drying to obtain the polypropylene composite material; wherein the weight ratio of the polypropylene to the ultrasonic dispersion is 95-98: 2-5.
Further, the weight ratio of the attapulgite to the nano titanium dioxide in the step (1) is 1: 3-4.
Further, the weight ratio of the attapulgite to the nano titanium dioxide in the step (1) is 1: 4.
Further, in the step (1), the solubilizer is tween-80, fatty alcohol sulfonate, alkyl sulfonate, fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether.
Further, the addition amount of the absolute ethyl alcohol in the step (1) is 4-5 times of the weight of the mixture of the attapulgite and the nano titanium dioxide; the addition amount of the solubilizer is 5 to 10 percent of the weight of the nano titanium dioxide.
Further, the addition amount of the absolute ethyl alcohol in the step (1) is 5 times of the weight of the mixture of the attapulgite and the nano titanium dioxide; the addition amount of the solubilizer is 10 percent of the weight of the nano titanium dioxide.
Further, the temperature is 40-60 ℃ during the ultrasonic dispersion in the step (1), the rotating speed is 200-.
Further, the weight ratio of the polypropylene to the ultrasonic dispersion in step (2) was 96: 4.
Further, the extrusion in the step (2) comprises the following specific steps: extruding in a double-screw extruder, wherein the temperature of a feeding section of the double-screw extruder is 190 ℃ plus 100 ℃, the temperature of a middle extrusion melting section is 220 ℃ plus 210 ℃, the temperature of a machine head is 220 ℃ plus 210 ℃, the main feeding rotating speed is 8-10r/min, and the rotating speed of a main machine is 260r/min plus 240.
The modified polypropylene composite material and the preparation method thereof provided by the invention have the following beneficial effects:
(1) the attapulgite serving as the clay nano material has excellent mechanical property, and the attapulgite can form good physical crosslinking points in a polypropylene matrix, so that the free volume of a polypropylene mesh structure is increased, the strength and toughness of the polypropylene composite material can be improved, and the mechanical property of the polypropylene composite material is enhanced.
The attapulgite and the nano titanium dioxide are mixed, the absolute ethyl alcohol and the solubilizer are added, and then the ultrasonic dispersion is carried out, so that the polypropylene can be effectively modified by the ultrasonic dispersion, and the original mechanical property of the polypropylene can be effectively improved while the ultraviolet aging resistance of the polypropylene composite material is improved.
(2) The preparation method is simple and feasible, low in cost, good in effect and suitable for industrial production.
Drawings
FIG. 1 is a typical stress-strain curve of the composite material obtained in example 1 under UV irradiation.
FIG. 2 is a graph showing typical stress-strain curves of the pure polypropylene material of comparative example 3 under UV irradiation.
Detailed Description
Example 1
A preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide in a mass ratio of 1:4, pouring into a three-neck glass bottle, adding 5 times of anhydrous ethanol and 10% of tween-80 by weight of the mixture of the attapulgite and the nano titanium dioxide, placing the three-neck glass bottle into an ultrasonic cleaner, setting the temperature of the ultrasonic cleaner at 60 ℃, the rotating speed of a force-increasing electric stirrer at 200r/min, stirring for 2 hours by oscillation, centrifuging, filtering and drying;
(2) mixing pure PP and the product obtained in the step (1) according to a mass ratio of 49:1, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 220 ℃, the temperature of a machine head to be 215 ℃, the main feeding rotating speed to be 8r/min and the main machine rotating speed to be 240r/min in sequence, cooling the extruded material by a cooling water tank, granulating by a granulator, and finally drying to obtain the PP-free polypropylene composite material.
Preparing the prepared modified polypropylene composite material into a test sample strip, and then testing by adopting an ultraviolet artificial accelerated ageing box, wherein an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, and the stress-strain curve chart of the composite material under the ultraviolet irradiation condition is shown in figure 1. And after the ultraviolet resistance aging is finished, the mechanical property of the material is measured, and the measurement result is as follows: the tensile strength is attenuated to 35.83MPa from 37.26MPa, and the impact strength is attenuated to 11.21KJ/m2Down to 10.15KJ/m2The Shore hardness is reduced from 97HD to 90HD, and the Vicat softening temperature is reduced from 164.6 ℃ to 158.2 ℃.
Example 2
A preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide in a mass ratio of 1:4, pouring into a three-neck glass bottle, adding 5 times of anhydrous ethanol and 10% of fatty alcohol sulfonate, placing the three-neck glass bottle into an ultrasonic cleaning machine, setting the temperature of the ultrasonic cleaning machine at 60 ℃, the rotating speed of a force-increasing electric stirrer at 200r/min, stirring for 2h by oscillation, centrifuging, filtering and drying;
(2) mixing pure PP and the product obtained in the step (1) according to a mass ratio of 48:2, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 215 ℃, the temperature of a machine head to be 210 ℃, the main feeding rotating speed to be 10r/min and the main machine rotating speed to be 250r/min in sequence, cooling the extruded material by a cooling water tank, granulating by a granulator, and finally drying to obtain the PP-free polypropylene composite material.
Preparing the prepared modified polypropylene composite material into a test sample strip, and then testing by adopting an ultraviolet artificial accelerated ageing box, wherein an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 35.34MPa from 36.74MPa, and the impact strength is attenuated to 12.37KJ/m2Down to 11.15KJ/m2The Shore hardness is reduced from 105HD to 97HD, and the Vicat softening temperature is reduced from 166.1 ℃ to 161.2 ℃.
Example 3
A preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide in a mass ratio of 1:3, pouring into a three-neck glass bottle, adding anhydrous ethanol 4 times the weight of the mixture of the attapulgite and the nano titanium dioxide and tween-80 5% of the weight of the nano titanium dioxide, putting the three-neck glass bottle into an ultrasonic cleaner, setting the temperature of the ultrasonic cleaner at 60 ℃, the rotating speed of a force-increasing electric stirrer at 200r/min, stirring for 2 hours by oscillation, centrifuging, filtering and drying;
(2) mixing pure PP and the product obtained in the step (1) according to a mass ratio of 48:2, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 215 ℃, the temperature of a machine head to be 210 ℃, the main feeding rotating speed to be 10r/min and the main machine rotating speed to be 250r/min in sequence, cooling the extruded material by a cooling water tank, granulating by a granulator, and finally drying to obtain the PP-free polypropylene composite material.
Preparing the prepared modified polypropylene composite material into a test sample strip, and then testing by adopting an ultraviolet artificial accelerated ageing box, wherein an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 35.40MPa from 36.92MPa, and the impact strength is attenuated to 10.92KJ/m2Down to 9.39KJ/m2The Shore hardness is reduced from 96HD to 89HD, and the Vicat softening temperature is reduced from 165.3 ℃ to 159.7 ℃.
Example 4
A preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide in a mass ratio of 1:4, pouring into a three-neck glass bottle, adding 5 times of anhydrous ethanol and 10% of alkyl sulfonate based on the weight of the nano titanium dioxide into the mixture, placing the three-neck glass bottle into an ultrasonic cleaning machine, setting the temperature of the ultrasonic cleaning machine at 60 ℃, the rotating speed of a force-increasing electric stirrer at 250r/min, stirring for 3 hours by oscillation, centrifuging, filtering and drying;
(2) mixing pure PP and the product obtained in the step (1) according to a mass ratio of 49:2, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 220 ℃, the temperature of a machine head to be 215 ℃, the main feeding rotating speed to be 8r/min and the main machine rotating speed to be 240r/min in sequence, cooling the extruded material by a cooling water tank, granulating by a granulator, and finally drying to obtain the PP-free polypropylene composite material.
Preparing the prepared modified polypropylene composite material into a test sample strip, and then adopting an ultraviolet personThe test is carried out in an accelerated aging box, an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 35.15MPa from 36.65MPa, and the impact strength is reduced to 12.23KJ/m2Down to 10.81KJ/m2The Shore hardness is reduced from 100HD to 89HD, and the Vicat softening temperature is reduced from 165.5 ℃ to 157.2 ℃.
Example 5
A preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide in a mass ratio of 1:3, pouring into a three-neck glass bottle, adding anhydrous ethanol with the weight 4 times that of the mixture of the attapulgite and the nano titanium dioxide and fatty alcohol-polyoxyethylene ether with the weight 10% of the nano titanium dioxide, putting the three-neck glass bottle into an ultrasonic cleaning machine, setting the temperature of the ultrasonic cleaning machine at 60 ℃, the rotating speed of a force-increasing electric stirrer at 250r/min, stirring for 2 hours by oscillation, centrifuging, filtering and drying;
(2) mixing pure PP and the product obtained in the step (1) according to a mass ratio of 48:1, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 215 ℃, the temperature of a machine head to be 210 ℃, the main feeding rotating speed to be 8r/min and the main machine rotating speed to be 240r/min in sequence, cooling the extruded material by a cooling water tank, granulating by a granulator, and finally drying to obtain the PP-free polypropylene composite material.
Preparing the prepared modified polypropylene composite material into a test sample strip, and then testing by adopting an ultraviolet artificial accelerated ageing box, wherein an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 34.80MPa from 36.31MPa, and the impact strength is attenuated to 11.51KJ/m2Down to 10.13KJ/m2The Shore hardness is reduced from 102HD to 90HD, and the Vicat softening temperature is reduced from 166.5 ℃ to 158.4 ℃.
Example 6
A preparation method of the modified polypropylene composite material comprises the following steps:
(1) mixing attapulgite and nano titanium dioxide in a mass ratio of 1:4, pouring into a three-neck glass bottle, adding anhydrous ethanol 4 times the weight of the mixture of the attapulgite and the nano titanium dioxide and alkylphenol ethoxylates 10% of the weight of the nano titanium dioxide, putting the three-neck glass bottle into an ultrasonic cleaning machine, setting the temperature of the ultrasonic cleaning machine at 50 ℃, the rotating speed of a force-increasing electric stirrer at 250r/min, stirring for 3 hours by oscillation, centrifuging, filtering and drying;
(2) mixing pure PP and the product obtained in the step (1) according to a mass ratio of 49:2.5, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 220 ℃, the temperature of a machine head to be 215 ℃, the main feeding rotating speed to be 8r/min and the main machine rotating speed to be 240r/min in sequence, cooling the extruded material by a cooling water tank, granulating by a granulator, and finally drying to obtain the PP-free polypropylene composite material.
Preparing the prepared modified polypropylene composite material into a test sample strip, and then testing by adopting an ultraviolet artificial accelerated ageing box, wherein an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 34.50MPa from 35.95MPa, and the impact strength is attenuated to 11.64KJ/m2Down to 10.13KJ/m2The Shore hardness is reduced from 96HD to 90HD, and the Vicat softening temperature is reduced from 165.4 ℃ to 159.8 ℃.
Comparative example 1
Mixing pure PP and pure attapulgite in a mass ratio of 49:1, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 215 ℃, the temperature of a machine head to be 210 ℃, the main feeding rotating speed to be 8r/min and the rotating speed of a main machine to be 240r/min in sequence, cooling the extruded materials by a cooling water tank, granulating by a granulator, and finally drying to prepare the attapulgite modified polypropylene composite material with the mass ratio of 2%.
Preparing the composite material into a test sample strip, and testing by adopting an ultraviolet artificial accelerated aging box, wherein an ultraviolet lamp is arranged in the ultraviolet artificial accelerated aging box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 24.43MPa from 34.21MPa, and the impact strength is attenuated to 9.64KJ/m2Down to 6.34KJ/m2The Shore hardness is reduced from 98HD to 83HD, and the Vicat softening temperature is reduced from 164.2 ℃ to 152.7 ℃.
Comparative example 2
Mixing pure PP and pure titanium dioxide according to a mass ratio of 49:1, adding the mixture into a double-screw extruder to perform extrusion mixing, setting the temperature of a feeding section of the double-screw extruder to be 100 ℃, 130 ℃, 150 ℃, 190 ℃, the temperature of a melting section to be 215 ℃, the temperature of a machine head to be 210 ℃, the main feeding rotating speed to be 8r/min, the rotating speed of a main machine to be 240r/min, cooling the extruded materials by a cooling water tank, granulating by a granulator, and finally drying to prepare the titanium dioxide modified polypropylene composite material with the mass ratio of 2%.
Preparing the composite material into a test sample strip, and testing by adopting an ultraviolet artificial accelerated aging box, wherein an ultraviolet lamp is arranged in the ultraviolet artificial accelerated aging box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in the box is 45 ℃, the aging time is 480h, the mechanical property of the sample is measured after the ultraviolet resistance aging is finished, and the measurement result is as follows: the tensile strength is attenuated to 30.68MPa from 35.15MPa, and the impact strength is attenuated to 8.42KJ/m2Down to 5.19KJ/m2The Shore hardness is reduced from 97HD to 87HD, and the Vicat softening temperature is reduced from 164.5 ℃ to 155.2 ℃.
Comparative example 3
Testing pure polypropylene material by adopting an ultraviolet artificial accelerated aging box, wherein an ultraviolet lamp is arranged in the box, and the ultraviolet radiation intensity is 0.89W/m2The distance between a light source and a sample is 40cm, the temperature in a box is 45 ℃, the aging time is 480h, and under the ultraviolet irradiation condition, the stress-strain curve diagram of a pure polypropylene materialSee fig. 2. And after the ultraviolet resistance aging is finished, the mechanical property of the material is measured, and the measurement result is as follows: the tensile strength is reduced from 32.70MPa to 17.49MPa, and the impact strength is reduced from 5.45KJ/m2Down to 2.19KJ/m2The Shore hardness of 81HD is reduced to 66HD, and the Vicat softening temperature of 151.9 ℃ is reduced to 141.7 ℃.
As can be seen from examples 1-6 and comparative examples 1-3, the ultrasonic dispersion is prepared by attapulgite and nano titanium dioxide under the action of absolute ethyl alcohol and a solubilizer, and the composite material obtained by modifying polypropylene by the ultrasonic dispersion has enhanced ultraviolet aging resistance and obviously reduced mechanical property attenuation amplitude. The polypropylene composite material obtained by adding the single additive in the comparative example 1-2 has the mechanical capability attenuation amplitude obviously higher than that of the polypropylene composite material obtained in the example 1-6 under the irradiation of ultraviolet rays, and the mechanical capability of the pure polypropylene material is reduced more quickly under the same conditions, which shows that the polypropylene composite material prepared by the invention can effectively improve the ultraviolet aging resistance and obviously reduce the mechanical property attenuation amplitude of the composite material after the irradiation of ultraviolet rays.
In addition, compared with pure polypropylene materials, the original mechanical properties of the polypropylene of the composite materials obtained in examples 1-6 and comparative examples 1-2 are improved, and the mechanical properties of the polypropylene of examples 1-6 are improved more obviously, which shows that the original mechanical properties of the polypropylene can be effectively improved by the polypropylene composite material prepared by the modification method provided by the invention.

Claims (8)

1. The preparation method of the modified polypropylene composite material is characterized by comprising the following steps:
(1) mixing attapulgite and nano titanium dioxide according to the weight ratio of 1:3-4, adding absolute ethyl alcohol and a solubilizer, and performing ultrasonic dispersion to obtain an ultrasonic dispersion; the temperature is 40-60 ℃ during ultrasonic dispersion, the rotating speed is 200-250r/min, and the time is 2-3 h;
(2) adding the ultrasonic dispersion into polypropylene for mixing, and then extruding, granulating and drying to obtain the polypropylene composite material; wherein the weight ratio of the polypropylene to the ultrasonic dispersion is 95-98: 2-5.
2. The preparation method of the modified polypropylene composite material according to claim 1, wherein the weight ratio of the attapulgite to the nano titanium dioxide in the step (1) is 1: 4.
3. The method for preparing a modified polypropylene composite material according to claim 1, wherein the solubilizer used in step (1) is tween-80, fatty alcohol sulfonate, alkyl sulfonate, fatty alcohol polyoxyethylene ether or alkylphenol polyoxyethylene ether.
4. The preparation method of the modified polypropylene composite material according to claim 1 or 3, wherein the amount of the absolute ethyl alcohol added in the step (1) is 4-5 times of the weight of the mixture of the attapulgite and the nano titanium dioxide; the addition amount of the solubilizer is 5 to 10 percent of the weight of the nano titanium dioxide.
5. The preparation method of the modified polypropylene composite material according to claim 4, wherein the amount of the absolute ethyl alcohol added in the step (1) is 5 times of the weight of the mixture of the attapulgite and the nano titanium dioxide; the addition amount of the solubilizer is 10 percent of the weight of the nano titanium dioxide.
6. The method for preparing a modified polypropylene composite according to claim 1, wherein the weight ratio of the polypropylene to the ultrasonic dispersion in the step (2) is 96: 4.
7. The method for preparing the modified polypropylene composite material according to claim 1, wherein the extrusion in the step (2) comprises the following steps: extruding in a double-screw extruder, wherein the temperature of a feeding section of the double-screw extruder is 190 ℃ plus 100 ℃, the temperature of an extrusion melting section is 220 ℃ plus 210 ℃, the temperature of a machine head is 220 ℃ plus 210 ℃, the main feeding rotating speed is 8-10r/min, and the rotating speed of a main machine is 260r/min plus 240.
8. A modified polypropylene composite obtainable by the process according to any one of claims 1 to 7.
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Citations (9)

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