CN109851960B - White graphene composite PTFE material and preparation method thereof - Google Patents
White graphene composite PTFE material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a white graphene composite PTFE material which comprises the following components in parts by weight: 0.1-20 parts of modified white graphene, 60-99.7 parts of PTFE resin, 0.1-10 parts of white oil and 0.1-20 parts of compatilizer. The invention also discloses a preparation method of the white graphene composite PTFE material. The modified white graphene is added into the white graphene composite PTFE material, so that good physical and chemical bonding effects between the white graphene and a PTFE matrix can be realized. The prepared white graphene composite PTFE material has the advantages of high strength, excellent heat conductivity, excellent wear resistance and the like, is easy to machine and form, and has wide application range and market prospect.
Description
Technical Field
The invention relates to a PTFE material, in particular to a white graphene composite PTFE material and a preparation method thereof.
Background
Polytetrafluoroethylene (PTFE), commonly known as "plastic king," is a polymeric compound formed by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealability, high lubricity, electrical insulation, and good aging resistance. Used as engineering plastics and can be made into polytetrafluoroethylene tubes, rods, belts, plates, films and the like. The method is generally applied to corrosion-resistant pipelines, containers, pumps, valves, radars, high-frequency communication equipment, radio equipment and the like with higher performance requirements. Despite the excellent comprehensive properties of PTFE, the industrial problems of low mechanical strength, poor wear resistance, low thermal conductivity, difficult processing and forming and the like exist, which seriously limits the further wide and specific field application of the plastic king.
At present, most manufacturers modify PTFE by adopting glass fibers, so that the mechanical strength and the wear resistance of the PTFE can be enhanced to a certain degree, but the requirements on light weight, high strength and high thermal conductivity in the fields of aerospace, electronic appliances and the like cannot be met, the GF filling amount is large (more than 20 percent), the double-screw extrusion is difficult to perform blanking, and a bidirectional side feeding system is mostly adopted for performing blanking; manufacturers also adopt molybdenum disulfide and graphite to reinforce PTFE, but the color of the product is blackened, and the transparency requirements of certain specific products cannot be met; and other additives such as a compatilizer, an antioxidant, a lubricant and the like are added into the formula of the modified PTFE plastic for auxiliary modification, which causes great difficulty in the type selection and formula design of processing equipment for modified plastic enterprises and inevitably causes the increase of the cost.
Disclosure of Invention
The invention aims to overcome the defects of low strength, poor wear resistance, poor thermal conductivity, difficult processing and forming, complex processing equipment and formula and the like of modified PTFE plastics in the current market, and provides a white graphene composite PTFE material and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: the white graphene composite PTFE material comprises the following components in parts by weight: 0.1-20 parts of modified white graphene, 60-99.7 parts of PTFE resin, 0.1-10 parts of white oil and 0.1-20 parts of compatilizer.
The white graphene composite PTFE material provided by the invention creatively uses white graphene as a few-layered two-dimensional material, and the plastic prepared from the PTFE material has high mechanical strength, flexibility, white or transparent property, high barrier property to water vapor, oxygen, carbon dioxide and the like, and a series of characteristics such as high thermal conductivity, self-lubricity and the like. When the addition amount of the modified white graphene is more than 20 parts, agglomeration is easy to occur, and the cost is high.
As a preferred embodiment of the white graphene composite PTFE material of the present invention, the preparation method of the modified white graphene comprises the following steps:
(1) activating the white graphene under strong acid to obtain white graphene A;
(2) putting the white graphene A into an ethanol water solution, adding gamma-mercaptopropyl trimethoxysilane, stirring for reaction, taking out, and washing to obtain white graphene B;
(3) adding the white graphene B into a DMF (dimethyl formamide) solvent containing ethylene monomers, adding a photoinitiator, irradiating by ultraviolet light, taking out, washing and drying to obtain the modified white graphene.
In the step (1), the purpose of strong acid treatment is to generate active groups such as hydroxyl, carboxyl and the like on the surface of the white graphene; the conditions of the activation treatment were: carrying out reflux treatment on the white graphene for 0.5-24 h at 70-350 ℃ by using strong acid.
In the step (2), gamma-mercaptopropyl trimethoxysilane is adopted to carry out surface modification on the white graphene, and the purpose of washing is to remove the gamma-mercaptopropyl trimethoxysilane remained on the surface of the white graphene. The stirring reaction time is 0.5-6 h.
In the step (3), the time of ultraviolet irradiation is 0.1-12 h, the ethylene monomer remained on the surface of the white graphene is washed off by washing, and the drying temperature is 30-150 ℃.
The modified white graphene is characterized in that ethylene high polymer is grafted on the surface of the white graphene in a mild, rapid, controllable and effective chemical manner by applying a novel mercapto-alkene click addition reaction, so that good compatibility with a polytetrafluoroethylene matrix is really realized, the modified white graphene can be well and uniformly dispersed in a PTFE matrix and can be mutually inserted into the PTFE matrix to form a net structure at the same time, the purpose of reinforcement is achieved, the generated binding force is far greater than the physical treatments of other manufacturers on the market such as simple filling, coating, adsorption and the like, and the purpose of chemical reinforcement is achieved; due to the high thermal conductivity, oxygen barrier property, wear resistance and self-lubricating property of the white graphene, the modified PTFE material is enhanced and toughened, the wear resistance and the thermal conductivity are improved, and the white graphene is convenient to process and mold.
As a preferred embodiment of the white graphene composite PTFE material of the present invention, the white graphene, γ -mercaptopropyltrimethoxysilane, a vinyl monomer, and a photoinitiator are prepared in parts by weight: 1 part of white graphene, 0.5-15 parts of gamma-mercaptopropyl trimethoxy silane, 10-50 parts of ethylene monomer and 0.5-10 parts of photoinitiator. The preparation of the modified white graphene can be realized by adopting the above ratio.
As a more preferable embodiment of the white graphene composite PTFE material of the present invention, the white graphene, γ -mercaptopropyltrimethoxysilane, a vinyl monomer, and a photoinitiator are prepared in parts by weight: 1 part of white graphene, 1-10 parts of gamma-mercaptopropyl-trimethoxysilane, 20-40 parts of vinyl monomers and 0.5-5 parts of photoinitiator. By adopting the raw material proportion, the prepared modified white graphene has better performance.
In a preferred embodiment of the white graphene composite PTFE material, the addition amount of the modified white graphene is 1-10 parts by weight; the modified white graphene is 2-20 layers of modified white graphene.
When the modified white graphene is added in the above amount, the modified white graphene can fully play a role in a PTFE material, is easy to disperse, has no agglomeration phenomenon, and can ensure the performance of PTFE plastics while controlling the lower production cost.
In a preferred embodiment of the white graphene composite PTFE material, the PTFE resin is 80-98 parts by weight, the white oil is 0.5-5 parts by weight, and the compatibilizer is 0.5-10 parts by weight. When the proportion is adopted, the plastic prepared from the PTFE material has higher mechanical strength, flexibility, white or transparent property, higher barrier property to water vapor, oxygen, carbon dioxide and the like, and higher thermal conductivity and self-lubricating property.
As a preferred embodiment of the white graphene composite PTFE material of the present invention, the strong acid species is nitric acid and/or sulfuric acid; the solvent adopted for washing is at least one of toluene, xylene, acetone, butanone and tetrahydrofuran.
The ethylene monomer as a preferred embodiment of the white graphene composite PTFE material is acrylonitrile and/or vinyl acetate; the photoinitiator species is at least one of 250, 369, 184, 907, 500 and 1173 photoinitiators.
As a preferred embodiment of the white graphene composite PTFE material of the present invention, the white oil is at least one of 1#, 3#, 5#, 7#, 10#, 15#, 26#, 36#, and 46# industrial grade white oil or food grade white oil.
As a preferred embodiment of the white graphene composite PTFE material of the present invention, the compatibilizer is PE-grafted maleic anhydride.
The invention also aims to provide a preparation method of the white graphene composite PTFE material, which comprises the following steps:
(A) starting a high-speed mixer to heat to 60-120 ℃, weighing PTFE resin, modified white graphene, white oil and a compatilizer, and premixing and dispersing for 5-30 min by a high-speed disperser;
(B) and (3) starting the double-screw extruder, controlling the temperature of each zone to be 170-230 ℃, the temperature of a machine head to be 180-240 ℃ and the rotating speed of a main machine to be 180-510 r/min, adding the premixed and dispersed material obtained in the step (A) into a charging barrel of the double-screw extruder after the material is stabilized, and carrying out mixing, extrusion, water cooling, bracing and grain cutting to obtain the white graphene composite PTFE material.
The invention has the beneficial effects that: the invention provides a white graphene composite PTFE material and a preparation method thereof. The prepared white graphene composite PTFE material has the advantages of high strength, excellent heat conductivity, excellent wear resistance and the like, is easy to machine and form, and has wide application range and market prospect.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene comprises: 1 part by weight of 2-20 layers of white graphene is subjected to reflux treatment for 3 hours at a high temperature of 150 ℃ by nitric acid, so that active groups such as hydroxyl, carboxyl and the like are generated on the surface of the white graphene; then placing the mixture into an ethanol water solution, adding 6 parts by weight of gamma-mercaptopropyltrimethoxysilane (KH590), mechanically stirring for 6 hours at normal temperature, and washing unreacted KH590 on the surface of the white graphene for multiple times by using acetone; and finally, placing the white graphene with the chemically modified KH590 on the surface into a DMF (dimethyl formamide) solvent dissolved with 30 parts by weight of vinyl acetate in advance, adding 1.5 parts by weight of photoinitiator 500, irradiating for 6 hours by using ultraviolet light, taking out the chemically grafted white graphene after the reaction is finished, washing unreacted vinyl acetate on the surface of the white graphene for multiple times by using toluene, and drying at 120 ℃ by using a vacuum oven to obtain the modified white graphene.
The preparation method of the white graphene composite PTFE material comprises the following steps:
(1) after the heating temperature of the high-speed mixer is stabilized at 80 ℃, weighing PTFE resin, modified white graphene, No. 15 industrial white oil and PE grafted maleic anhydride (PE-g-MAH) according to parts by weight, premixing and dispersing for 6min by using a high-speed stirrer, and discharging;
(2) and (2) controlling the temperature of each zone of the double-screw extruder to be stabilized at 290-330 ℃, controlling the temperature of a machine head to be stabilized at 340 ℃, adding the premixed and dispersed mixture obtained in the step (1) into a cylinder of the double-screw extruder, controlling the rotating speed of a main machine to be 210r/min, and carrying out mixing, extrusion, water cooling, bracing and grain cutting to obtain the white graphene composite PTFE material.
Example 2
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene comprises: 1 part by weight of 2-20 layers of white graphene is subjected to reflux treatment for 5 hours at a high temperature of 120 ℃ by using sulfuric acid, so that active groups such as hydroxyl, carboxyl and the like are generated on the surface of the white graphene; then placing the mixture into an ethanol water solution, adding 10 parts by weight of gamma-mercaptopropyltrimethoxysilane (KH590), mechanically stirring the mixture at normal temperature for 6 hours, and washing unreacted KH590 on the surface of the white graphene for multiple times by using toluene; and finally, placing the white graphene with the chemically modified KH590 on the surface into a DMF (dimethyl formamide) solvent dissolved with 40 parts by weight of acrylonitrile in advance, adding 5 parts by weight of a photoinitiator 1173, irradiating for 5 hours by using ultraviolet light, taking out the chemically grafted white graphene after the reaction is finished, washing unreacted acrylonitrile on the surface of the white graphene for multiple times by using acetone, and drying at 100 ℃ by using a vacuum oven to obtain the modified white graphene.
The preparation method of the white graphene composite PTFE material comprises the following steps:
(1) after the heating temperature of the high-speed mixer is stabilized at 90 ℃, weighing PTFE resin, modified white graphene, 26# industrial white oil and PE-g-MAH in parts by weight, premixing and dispersing for 10min by using a high-speed stirrer, and discharging;
(2) and (2) controlling the temperature of each zone of the double-screw extruder to be 300-340 ℃, controlling the temperature of a machine head to be 350 ℃, adding the premixed and dispersed mixture obtained in the step (1) into a cylinder of the double-screw extruder, controlling the rotating speed of a main machine to be 320r/min, and mixing, extruding, water-cooling, drawing strips and granulating to obtain the white graphene composite PTFE material.
Example 3
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene comprises: 1 part by weight of 2-20 layers of white graphene is subjected to reflux treatment for 6 hours at a high temperature of 100 ℃ by using mixed acid of nitric acid and sulfuric acid, so that active groups such as hydroxyl, carboxyl and the like are generated on the surface of the white graphene; then placing the mixture into an ethanol water solution, adding 1 weight part of gamma-mercaptopropyltrimethoxysilane (KH590), mechanically stirring for 8 hours at normal temperature, and washing unreacted KH590 on the surface of the white graphene for multiple times by using acetone; and finally, placing the white graphene with the chemically modified KH590 on the surface into a DMF (dimethyl formamide) solvent dissolved with 20 parts by weight of vinyl acetate in advance, adding 3 parts by weight of photoinitiator 184, irradiating for 3 hours by using ultraviolet light, taking out the chemically grafted white graphene after the reaction is finished, washing unreacted vinyl acetate on the surface of the white graphene for multiple times by using tetrahydrofuran, and drying at 90 ℃ by using a vacuum oven to obtain the modified white graphene.
The preparation method of the white graphene composite PTFE material comprises the following steps:
(1) after the heating temperature of the high-speed mixer is stabilized at 90 ℃, weighing PTFE resin, modified white graphene, 36# food-grade white oil and PE-g-MAH in parts by weight, premixing and dispersing for 15min by using a high-speed mixer, and discharging;
(2) and (2) controlling the temperature of each zone of the double-screw extruder to be stable at 310-350 ℃, controlling the temperature of a machine head to be stable at 360 ℃, adding the premixed and dispersed mixture obtained in the step (1) into a charging barrel of the double-screw extruder, controlling the rotating speed of a main machine to be 420r/min, and carrying out mixing, extrusion, water cooling, bracing and grain cutting to obtain the white graphene composite PTFE material.
Example 4
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene comprises: 1 part by weight of 2-20 layers of white graphene is subjected to reflux treatment for 0.5h at 350 ℃ by nitric acid to generate active groups such as hydroxyl, carboxyl and the like on the surface of the white graphene; then placing the mixture into an ethanol water solution, adding 15 parts by weight of gamma-mercaptopropyltrimethoxysilane (KH590), mechanically stirring for 0.5h at normal temperature, and washing unreacted KH590 on the surface of the white graphene for multiple times by using acetone; and finally, placing the white graphene with the chemically modified KH590 on the surface into a DMF (dimethyl formamide) solvent dissolved with 50 parts by weight of acrylonitrile in advance, adding 10 parts by weight of a photoinitiator 1173, irradiating for 12 hours by using ultraviolet light, taking out the chemically grafted white graphene after the reaction is finished, washing unreacted acrylonitrile on the surface of the white graphene for multiple times by using toluene, and drying at 100 ℃ by using a vacuum oven to obtain the modified white graphene.
The preparation method of the white graphene composite PTFE material is the same as that of the embodiment 1.
Example 5
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene comprises: 1 part by weight of 2-20 layers of white graphene is subjected to reflux treatment for 24 hours at a high temperature of 70 ℃ by nitric acid, so that active groups such as hydroxyl, carboxyl and the like are generated on the surface of the white graphene; then placing the mixture into an ethanol water solution, adding 0.5 weight part of gamma-mercaptopropyltrimethoxysilane (KH590), mechanically stirring for 6 hours at normal temperature, and washing unreacted KH590 on the surface of the white graphene for multiple times by using acetone; and finally, placing the white graphene with the chemically modified KH590 on the surface into a DMF (dimethyl formamide) solvent dissolved with 10 parts by weight of acrylonitrile in advance, adding 0.5 part by weight of a photoinitiator 1173, irradiating for 0.1h by using ultraviolet light, taking out the chemically grafted white graphene after the reaction is finished, washing unreacted acrylonitrile on the surface of the white graphene for multiple times by using toluene, and drying at 100 ℃ by using a vacuum oven to obtain the modified white graphene.
The preparation method of the white graphene composite PTFE material is the same as that of the embodiment 1.
Example 6
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene is the same as that in embodiment 1.
The preparation method of the white graphene composite PTFE material is the same as that of example 1.
Example 7
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene is the same as that in embodiment 1.
The preparation method of the white graphene composite PTFE material is the same as that of example 1.
Example 8
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene is the same as that in embodiment 1.
The preparation method of the white graphene composite PTFE material is the same as that of example 1.
Example 9
In an embodiment of the white graphene composite PTFE material of the present invention, a formula of the white graphene composite PTFE material of the present embodiment is shown in table 1.
In this embodiment, the preparation method of the modified white graphene is the same as that in embodiment 1.
The preparation method of the white graphene composite PTFE material is the same as that of example 1.
Table 1 formulations of white graphene composite PTFE materials described in examples 1-9 and comparative example 3
Comparative example 1
The preparation method of the PTFE material of the comparative example comprises the following steps:
(1) PTFE resin premixing and dispersing: after the heating temperature of the high-speed mixer is stabilized at 80 ℃, 60 parts of PTFE resin, 5 parts of compatilizer PE-g-MAH, 3 parts of phenolic antioxidant 1010 and 7 parts of polytetrafluoroethylene wax are respectively weighed according to parts by weight and premixed and dispersed for 6min by a high-speed mixer to be discharged;
(2) preparing the glass fiber modified PTFE material: and (2) controlling the temperature of each zone of the bidirectional feeding double-screw extruder to be 290-330 ℃, controlling the temperature of a machine head to be 340 ℃, adding the premixed and dispersed mixture obtained in the step (1) into a main material cylinder of the double-screw extruder, adding 25 parts of glass fiber GF into the side feeding cylinder of the double-screw extruder, controlling the rotating speed of the main machine to be 210r/min, and mixing, extruding, water cooling, drawing strips and cutting granules to obtain the glass fiber modified PTFE material.
Comparative example 2
The preparation method of the PTFE material of the comparative example comprises the following steps:
(1) and white graphene/PTFE resin premixing and dispersing: after the heating temperature of the high-speed mixer is stabilized at 80 ℃, 93 parts of PTFE resin, 2 parts of unmodified white graphene, 2 parts of No. 15 industrial white oil and 3 parts of PE-g-MAH are respectively weighed according to parts by weight and premixed and dispersed for 6min by a high-speed mixer to be discharged;
(2) and preparing the white graphene modified PTFE material: and (2) controlling the temperature of each zone of the double-screw extruder to be 290-330 ℃, controlling the temperature of a machine head to be 340 ℃, adding the premixed and dispersed mixture obtained in the step (1) into a cylinder of the double-screw extruder, controlling the rotating speed of a main machine to be 210r/min, and mixing, extruding, water-cooling, drawing strips and cutting into granules to obtain the white graphene modified PTFE material.
Comparative example 3
The formula of the white graphene composite PTFE material of the comparative example is shown in Table 1.
In this comparative example, the preparation method of the modified white graphene is the same as that of example 1.
The preparation method of the white graphene composite PTFE material is the same as that of example 1.
Example 10
The PTFE materials prepared in the examples 1-9 and the comparative examples 1-3 are injection molded into standard sample strips for testing, and the performances of the PTFE materials in the examples 1-9 and the comparative examples 1-3 are tested by the following testing method: tensile strength according to ISO 527-2: 1993; notched impact strength according to ISO179-1: 2000; the abrasion loss is determined according to GB/T3960-2016; thermal conductivity according to GB/T10294-2008.
The test results are shown in Table 2.
TABLE 2 Properties of PTFE materials described in examples 1 to 9 and comparative examples 1 to 3
As can be seen from Table 2, compared with comparative examples 1 to 3, the PTFE materials of examples 1 to 9 are more transparent, have higher tensile strength and notch impact strength, and have better wear resistance and higher thermal conductivity. With the increase of the addition amount of the modified white graphene, the tensile strength, the notch impact strength, the wear resistance and the thermal conductivity of the PTFE material are all increased, but when the addition amount of the modified white graphene exceeds 10 parts, the strength, the wear resistance and the thermal conductivity are not obviously improved, but the cost is greatly increased, and when the addition amount is more than 20 parts, the tensile strength is reduced to the level of PTFE plastics prepared by a common method, and the PTFE plastics are agglomerated to a certain extent, so that the cost is high.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The white graphene composite PTFE material is characterized by comprising the following components in parts by weight: 0.1-20 parts of modified white graphene, 60-99.7 parts of PTFE resin, 0.1-10 parts of white oil and 0.1-20 parts of compatilizer; the preparation method of the modified white graphene comprises the following steps:
(1) activating the white graphene under strong acid to obtain white graphene A;
(2) putting the white graphene A into an ethanol water solution, adding gamma-mercaptopropyl trimethoxysilane, stirring for reaction, taking out, and washing to obtain white graphene B;
(3) adding the white graphene B into a DMF (dimethyl formamide) solvent containing ethylene monomers, adding a photoinitiator, irradiating by ultraviolet light, taking out, washing and drying to obtain the modified white graphene.
2. The white graphene composite PTFE material of claim 1, wherein the white graphene, the gamma-mercaptopropyltrimethoxysilane, the vinyl monomer and the photoinitiator are prepared from the following components in parts by weight: 1 part of white graphene, 0.5-15 parts of gamma-mercaptopropyl trimethoxy silane, 10-50 parts of ethylene monomer and 0.5-10 parts of photoinitiator.
3. The white graphene composite PTFE material of claim 1, wherein the modified white graphene is added in an amount of 1 to 10 parts by weight; the modified white graphene is 2-20 layers of modified white graphene.
4. The white graphene composite PTFE material according to claim 3, wherein the PTFE resin is 80 to 98 parts by weight, the white oil is 0.5 to 5 parts by weight, and the compatibilizer is 0.5 to 10 parts by weight.
5. The white graphene composite PTFE material of claim 1, wherein the strong acid species is nitric acid and/or sulfuric acid; the solvent adopted for washing is at least one of toluene, xylene, acetone, butanone and tetrahydrofuran.
6. The white graphene composite PTFE material according to claim 1, wherein the vinyl monomer is acrylonitrile and/or vinyl acetate; the photoinitiator species is at least one of 250, 369, 184, 907, 500 and 1173 photoinitiators.
7. The white graphene composite PTFE material of claim 1, wherein the white oil is at least one of 1#, 3#, 5#, 7#, 10#, 15#, 26#, 36#, 46# industrial grade white oil or food grade white oil.
8. The white graphene composite PTFE material of claim 1, wherein the compatibilizer is PE grafted maleic anhydride.
9. The preparation method of the white graphene composite PTFE material according to any one of claims 1 to 8, comprising the following steps:
(A) starting a high-speed mixer to heat to 60-120 ℃, weighing PTFE resin, modified white graphene, white oil and a compatilizer, and premixing and dispersing for 5-30 min by a high-speed disperser;
(B) and (3) starting the double-screw extruder, controlling the temperature of each zone to be 290-350 ℃, the temperature of a machine head to be 300-360 ℃, and the rotating speed of a main machine to be 180-550 r/min, adding the premixed and dispersed material obtained in the step (A) into a charging barrel of the double-screw extruder after the material is stabilized, and carrying out mixing, extrusion, water cooling, bracing and grain cutting to obtain the white graphene composite PTFE material.
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| 巯基光点击化学用于二氧化硅微球表面修饰;刘岩 等;《化学研究与应用》;20170630;第29卷(第6期);第768-771页 * |
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| CN109851960A (en) | 2019-06-07 |
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