CN114539676A - Polypropylene composite material and preparation method thereof - Google Patents
Polypropylene composite material and preparation method thereof Download PDFInfo
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- CN114539676A CN114539676A CN202011337706.9A CN202011337706A CN114539676A CN 114539676 A CN114539676 A CN 114539676A CN 202011337706 A CN202011337706 A CN 202011337706A CN 114539676 A CN114539676 A CN 114539676A
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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
- C08L23/14—Copolymers of propene
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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
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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
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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Abstract
The invention discloses a polypropylene composite material and a preparation method thereof, wherein the polypropylene composite material is prepared from 100 parts of polypropylene resin, 5-40 parts of pretreated mica powder, 3-5 parts of low-density polyethylene, 0.2-1.0 part of antioxidant and 0-2 parts of lubricant in parts by weight, wherein the pretreated mica powder is prepared by modifying mica powder with oxidized polyethylene wax. The polypropylene composite material has excellent mechanical properties, especially improves low-temperature toughness, and expands the application field thereof.
Description
Technical Field
The invention belongs to the technical field of modification of high polymer materials, and particularly relates to a polypropylene composite material and a preparation method thereof.
Background
Polypropylene (PP) is one of the most expensive general-purpose plastics currently used in large quantities, and has many excellent characteristics, such as wide sources, low price, low density, no toxicity, easy processing, and the like, so that it is widely used in the fields of automobiles, home appliances, electronics and electronics, and the like.
In recent years, industries such as automobiles, electric appliances and the like in China are rapidly developed, particularly, the production and sales volume of cars and household appliances keeps a higher growth speed all the time, and China becomes a global and important consumption market of automobiles and household appliances. On the premise of ensuring safety, light weight and plastic integration are the development trend. At present, the plastic for automobiles accounts for more than 15 percent of the total amount of the plastic, the polypropylene material accounts for more than 40 percent of the total amount of the plastic for automobiles, and the total consumption amount reaches 50 ten thousand tons. Wherein more than 80 percent of the polypropylene material is suitable for producing the automobile bumper, and can achieve the effects of reducing cost, being easy to lighten, being recyclable and the like. In the household appliance industry, the plastic consumption accounts for more than 40%, the product plastication becomes one of important development directions in the household appliance industry, and the plastic becomes a material with the fastest increasing speed in the application amount in the field of household appliances.
Although polypropylene has the advantages of abundant raw material sources, simple synthesis process, modern mass production, low density compared with metal, low price, good strength, good processability and the like, polypropylene also has the defects of poor low-temperature impact resistance, large molding shrinkage, insufficient rigidity and toughness and the like.
Disclosure of Invention
In view of the above, the present invention needs to provide a polypropylene composite material and a preparation method thereof, in which oxidized polyethylene wax, low density polyethylene and other additives are added into a polypropylene system, so that the obtained polypropylene composite material has excellent low temperature toughness and excellent mechanical properties, so as to solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a polypropylene composite material which is prepared from 100 parts of polypropylene resin, 5-40 parts of pretreated mica powder, 3-5 parts of low-density polyethylene, 0.2-1.0 part of antioxidant and 0-2 parts of lubricant in parts by weight, wherein the pretreated mica powder is prepared by modifying mica powder with oxidized polyethylene wax.
According to the invention, oxidized polyethylene wax is adopted to modify the surface of mica powder, so that oxidized polyethylene can be fully attached to the interlayer and the surface of mica, thereby improving the dispersibility of the mica powder in a polypropylene matrix, improving the binding force between the mica powder and the polypropylene matrix and increasing the mechanical property of the polypropylene composite material. The further pretreated mica powder can act synergistically with the low-density polyethylene to enhance the low-temperature impact strength of the polypropylene composite material.
Further, the polypropylene in the present invention may be any standard type polypropylene resin which is conventional in the art, and is not particularly limited, and preferably, in some specific embodiments of the present invention, the polypropylene resin is a copolymerized polypropylene having a melt flow rate of 1.0 to 100g/10min, such as copolymerized polypropylene having a melt flow rate of 1.0g/10min, 10g/10min, 60g/10min, 100g/10min, and the like, which can be adjusted as required.
Further, the antioxidant in the present invention is not particularly limited, and antioxidants conventionally used in the art can be used in the present invention, and specific examples include, but are not limited to, at least one of pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], n-octadecyl β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, tris- (2, 4-di-t-butylphenyl) phosphite, and dioctadecyl thiodipropionate.
Further, the lubricant used in the present invention may be any lubricant that is conventional in the art, and preferably, white oil is used as the lubricant in some specific embodiments of the present invention.
Further, the mica powder is sericite powder, the particle size of which is 400-3000 meshes, and it can be understood that any particle size of mica powder can be used in the invention, and in some embodiments of the invention, the 400-3000 mesh mica powder is preferably adopted, so that the performance of the polypropylene composite material is better.
Further, the pretreatment method for pretreating mica powder comprises the following steps: adding mica powder into 10 weight parts of oxidized polyethylene wax emulsion, stirring at 200-300rpm at 40-50 ℃ for 10-20min, and stopping stirring; then drying for 40-60min at 50-60 ℃ after ultrasonic dispersion for 20-30min, and carrying out pretreatment within a limited range to realize better effect, wherein the pretreatment is not particularly limited and can be adjusted within the range as required.
Preferably, the oxidized polyethylene wax emulsion has a solids content of 40. + -. 2%.
Preferably, the ultrasonic frequency of the ultrasonic dispersion is 20-40 kHz.
By utilizing the unique layered structure of mica, the suspension performance of mica in liquid is good, oxidized polyethylene can be fully attached to the interlayer and the surface of mica through the special pretreatment process, the bonding force is strong, and the dispersibility of mica powder in a polypropylene matrix can be obviously improved after the pretreated mica powder is added into the polypropylene matrix. In addition, more importantly, because the oxidized polyethylene and the polypropylene matrix have excellent compatibility, the oxidized polyethylene is used as an interface modifier in the invention, and the oxidized polyethylene can greatly enhance the binding capacity between the polypropylene matrix and the mica powder, thereby obviously enhancing the tensile strength, the bending strength, and the normal-temperature and low-temperature impact resistance of the polypropylene composite material.
The invention also provides a preparation method of the polypropylene composite material, which comprises the following steps:
fully mixing the polypropylene, the pretreated mica powder, the low-density polyethylene, the antioxidant and the lubricant according to the weight part ratio to obtain a uniform mixed material, wherein the sufficient mixing can adopt any conventional mixing mode in the field, such as mechanical mixing, and the mixing parameters such as rotating speed, time and the like are not particularly limited as long as the aim of uniform mixing can be achieved;
and adding the mixed material into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material.
It is understood that the processing parameters of the twin-screw extruder can be adjusted according to the selection of the matrix resin, the auxiliary agent, etc., and therefore, there is no particular limitation, and preferably, in some specific embodiments of the present invention, the temperatures of the twin-screw extruder are 150-.
Compared with the prior art, the polypropylene composite material has excellent mechanics, and the tensile strength is 31-45MPa and the bending strength at 23 ℃ is 47-69kJ/m in a test2The notched Izod impact strength at 23 ℃ is between 27 and 41kJ/m2Wherein the low-temperature toughness is obviously improved, and the notch impact strength of a cantilever beam at minus 30 ℃ is 16-23kJ/m2。
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The matrix resin and the auxiliary sources used in the following examples and comparative examples were:
example 4 polypropylene was used: model BH3520 (melt index 10g/10min), Korea SK;
other examples and comparative examples used polypropylene: the model is as follows: EA5075 (melt index 60g/10min), Korea Polymeria;
mica powder: sericite powder with the particle size of 400-3000.
The oxidized polyethylene wax emulsion producer is Nantong Orno chemical Co., Ltd, the mark is HA-soft80, and the solid content of the oxidized polyethylene wax emulsion is 40 +/-2%;
antioxidant: 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, dioctadecyl thiodipropionate were all produced by cyanochemistry;
white oil, Wingzhen Industrial oils, Inc. of Wuxi city;
KH550, KH570, titanate coupling agent NXH-101, aluminate coupling agent NXH-821 are all produced by Nanjing Xuanyao New materials science and technology Limited.
Preparation of pretreated mica powder in examples 1-5: adding mica powder into oxidized polyethylene wax emulsion in 10 times of the weight of the mica powder, stirring for 15 minutes at 45 ℃ and at a stirring speed of 200 rpm, stopping stirring, starting an ultrasonic disperser, and performing ultrasonic dispersion for 25 minutes at an ultrasonic frequency of 30 kHz. Taking out, drying at 55 deg.C for 50 min, and storing.
It should be noted that the above selection of the matrix resin and the auxiliary agent is only for making the technical solutions clear in the embodiments, and does not represent that the present invention can only adopt the above matrix resin and auxiliary agent, and other matrix resins, auxiliary agents, etc. of other manufacturers or brands can be used in the present invention within the protection scope of the claims.
Example 1
100 parts of polypropylene, 5 parts of pretreated mica powder, 3 parts of low-density polyethylene and 0.2 part of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester are added into a high-speed mixer according to the parts by weight and mixed uniformly at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 140 ℃, 150 ℃, 170 ℃, 180 ℃, 190 ℃ and 200 ℃, 210 ℃ and 210 ℃ from the feeding section to the head.
Example 2
Taking 100 parts by weight of polypropylene, 10 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.5 part by weight of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate and 2 parts by weight of white oil, adding into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃ and 220 ℃ from the feeding section to the head.
Example 3
Taking 100 parts of polypropylene, 20 parts of pretreated mica powder, 5 parts of low-density polyethylene, 1.0 part of tris- (2, 4-di-tert-butylphenyl) phosphite and 2 parts of white oil according to parts by weight, and adding the materials into a high-speed mixer to mix the materials uniformly at normal temperature; and then adding the uniformly mixed materials into a double-screw extruder, and mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from a feeding section to a machine head in sequence.
Example 4
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 5 parts by weight of low-density polyethylene, 1.0 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Example 5
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the low polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Example 6
In this embodiment, the preparation method of the pretreated mica powder comprises the following steps: adding mica powder into 10 times of oxidized polyethylene wax emulsion by weight, stirring at 40 ℃ and 250rpm for 10min, and stopping stirring; then ultrasonically dispersing at 20kHz for 20min, drying at 50 ℃ for 40min, and storing.
The raw material components and the preparation method of the polypropylene composite material are the same as those of the example 1.
Example 7
In this embodiment, the preparation method of the pretreated mica powder comprises the following steps: adding mica powder into 10 times of oxidized polyethylene wax emulsion by weight, stirring at 300rpm for 20min at 50 ℃, and stopping stirring; then ultrasonically dispersing at 40kHz for 30min, drying at 60 ℃ for 60min, and storing.
The raw material components and the preparation method of the polypropylene composite material are the same as those of example 1.
Comparative example 1
Adding 100 parts by weight of polypropylene, 40 parts by weight of mica powder (without pretreatment), 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 2
The pretreated mica powder of the comparative example is prepared by the following process: adding mica powder into 10 times of oxidized polyethylene wax emulsion by weight, and stirring for 15 minutes at 45 ℃ and at a stirring speed of 200 revolutions per minute. Taking out, drying at 55 deg.C for 50 min, and storing.
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 3
The pretreated mica powder of the comparative example is prepared by the following process: adding mica powder into 10 times of oxidized polyethylene wax emulsion by weight for ultrasonic dispersion for 25 minutes at the temperature of 45 ℃ and the ultrasonic frequency of 30 kHz. Taking out, drying at 55 deg.C for 50 min, and storing.
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 4
The mica powder pretreated by the comparative example is prepared by the following process: adding mica powder into 10 times of oxidized polyethylene wax emulsion by weight, and stirring for 15 minutes at 45 ℃ and at the stirring speed of 200 revolutions per minute. Stopping stirring, starting the ultrasonic disperser, and ultrasonically dispersing for 25 minutes at the ultrasonic frequency of 30 kHz. Taking out, drying at 70 deg.C for 50 min, and storing.
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 5
The pretreated mica powder of the comparative example is prepared by the following process: adding mica powder into 10 weight parts of coupling agent KH550 aqueous solution (mass fraction of 2%) and stirring for 15 minutes at 45 ℃ and 200-rpm. Stopping stirring, starting the ultrasonic disperser, and ultrasonically dispersing for 25 minutes at the ultrasonic frequency of 30 kHz. Taking out, drying at 55 deg.C for 50 min, and storing.
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
then adding the uniformly mixed materials into a double-screw extruder, and mixing and extruding to obtain the polypropylene composite material with excellent low-temperature toughness; the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 6
The pretreated mica powder of the comparative example is prepared by the following process: mica powder is added into 10 weight parts of aqueous solution (mass fraction is 2%) of aluminate coupling agent NXH-821 and stirred for 15 minutes at the temperature of 45 ℃ and the stirring speed of 200-r/min. Stopping stirring, starting the ultrasonic disperser, and ultrasonically dispersing for 25 minutes at the ultrasonic frequency of 30 kHz. Taking out, drying at 55 deg.C for 50 min, and storing.
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 7
The pretreated mica powder of the comparative example is prepared by the following process: adding mica powder into 10 weight parts of titanate coupling agent NXH-101 aqueous solution (mass fraction is 2%) and stirring for 15 minutes at 45 ℃ and at a stirring speed of 200-revolutions per minute. Stopping stirring, starting the ultrasonic disperser, and ultrasonically dispersing for 25 minutes at the ultrasonic frequency of 30 KHZ. Taking out, drying at 55 deg.C for 50 min, and storing.
Adding 100 parts by weight of polypropylene, 40 parts by weight of pretreated mica powder, 4 parts by weight of low-density polyethylene, 0.8 part by weight of dioctadecyl thiodipropionate and 2 parts by weight of white oil into a high-speed mixer, and uniformly mixing at normal temperature;
and then adding the uniformly mixed materials into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material, wherein the temperature of the double-screw extruder is 150 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃ and 220 ℃ from the feeding section to the head in sequence.
Comparative example 8
The same procedure as in example 5 was repeated except that "40 parts of pretreated mica powder" in example 5 was replaced with "8 parts of mica powder and 32 parts of oxidized polyethylene wax".
Comparative example 9
The same procedure as in example 5 was repeated except that "40 parts of pretreated mica powder and 4 parts of low-density polyethylene" in example 5 were replaced with "44 parts of pretreated mica powder".
Comparative example 10
The same procedure as in example 5 was repeated except that "40 parts of pretreated mica powder and 4 parts of low-density polyethylene" in example 5 were replaced with "44 parts of low-density polyethylene".
The polypropylene composites obtained in the examples and comparative examples were injection molded into standard bars using ASTM standards. The spline dimensions (length × width × thickness) are:
the sample strip for testing the tensile strength and the bending strength is a dumbbell shape, and is 170mm multiplied by 13mm multiplied by 3.2 mm;
the cantilever beam notch impact strength test sample strip is 127mm multiplied by 13mm multiplied by 3.2mm, the V-shaped notch is 1/5 in depth;
tensile strength was measured according to ASTM D638, tensile speed 5 mm/min;
flexural strength was tested according to ASTM D790 at a flexural speed of 1.25 mm/min;
notched izod impact performance was tested in accordance with ASTM D256.
The test results are shown in table 1:
TABLE 1 Polypropylene composite Performance test results
The test results in table 1 show that the mechanical properties, especially low-temperature toughness, of the polypropylene composite material are significantly improved by pretreating the mica powder through the special pretreatment process, mainly because the mica is of a layered structure and has good suspension property in liquid, the oxidized polyethylene can be sufficiently attached between layers and on the surface of the mica through the special treatment process, and has strong binding force, and the dispersibility in the polypropylene matrix can be significantly improved after the oxidized polyethylene is added to the polypropylene matrix. And the oxidized polyethylene has excellent compatibility with the polypropylene matrix, and as an interface modifier, the oxidized polyethylene can greatly enhance the binding capacity between the polypropylene matrix and the mica powder, thereby obviously increasing the tensile strength, the bending strength, and the normal-temperature and low-temperature impact resistance of the polypropylene composition.
In addition, as can be seen from example 5 and comparative examples 9 and 10, the pretreated mica powder and the low-density polyethylene have a certain synergistic effect, and the synergistic effect greatly enhances the low-temperature impact strength of the polypropylene composite material.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The polypropylene composite material is characterized by being prepared from 100 parts of polypropylene resin, 5-40 parts of pretreated mica powder, 3-5 parts of low-density polyethylene, 0.2-1.0 part of antioxidant and 0-2 parts of lubricant in parts by weight, wherein the pretreated mica powder is prepared by modifying mica powder with oxidized polyethylene wax.
2. The polypropylene composite according to claim 1, wherein the polypropylene resin is a copolymerized polypropylene having a melt flow rate of 1.0 to 100g/10min at 230 ℃ under 2.16 kg.
3. The polypropylene composite of claim 1, wherein the antioxidant is selected from at least one of pentaerythrityl tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], n-octadecyl β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, tris- (2, 4-di-t-butylphenyl) phosphite, and dioctadecyl thiodipropionate.
4. The polypropylene composite of claim 1, wherein the lubricant is selected from white oils.
5. The polypropylene composite of claim 1, wherein the mica powder is sericite powder, and the particle size is 400-3000 mesh.
6. The polypropylene composite according to claim 1, wherein the pretreatment method for pretreating mica powder comprises: adding mica powder into 10 weight parts of oxidized polyethylene wax emulsion, stirring at 200-300rpm at 40-50 ℃ for 10-20min, and stopping stirring; then ultrasonic dispersing for 20-30min, and drying at 50-60 deg.C for 40-60 min.
7. The polypropylene composite of claim 6, wherein the oxidized polyethylene wax emulsion has a solids content of 40 ± 2%.
8. The polypropylene composite of claim 6, wherein the ultrasonic frequency of the ultrasonic dispersion is 20 to 40 kHz.
9. A process for the preparation of a polypropylene composite according to any one of claims 1 to 8, comprising the steps of:
fully mixing the polypropylene resin, the pretreated mica powder, the low-density polyethylene, the antioxidant and the lubricant according to the weight part ratio to obtain a uniform mixed material;
and adding the mixed material into a double-screw extruder, mixing and extruding to obtain the polypropylene composite material.
10. The method as claimed in claim 9, wherein the temperature of the twin-screw extruder is sequentially from the feeding section to the head at 150 ℃, 150-.
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| CN116376093A (en) * | 2023-05-11 | 2023-07-04 | 无锡会通轻质材料股份有限公司 | Weather-resistant foaming polypropylene bead, preparation method thereof and molded product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1986627A (en) * | 2005-12-22 | 2007-06-27 | 吴永刚 | Composite polypropylene material and its preparing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1986627A (en) * | 2005-12-22 | 2007-06-27 | 吴永刚 | Composite polypropylene material and its preparing method |
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| CN116376093A (en) * | 2023-05-11 | 2023-07-04 | 无锡会通轻质材料股份有限公司 | Weather-resistant foaming polypropylene bead, preparation method thereof and molded product |
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