CN114805999A - Cable material capable of being immersed in fluorinated cooling liquid and preparation method thereof - Google Patents
Cable material capable of being immersed in fluorinated cooling liquid and preparation method thereof Download PDFInfo
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- CN114805999A CN114805999A CN202210522848.5A CN202210522848A CN114805999A CN 114805999 A CN114805999 A CN 114805999A CN 202210522848 A CN202210522848 A CN 202210522848A CN 114805999 A CN114805999 A CN 114805999A
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- 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
- C08L23/04—Homopolymers or copolymers of ethene
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- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0869—Acids or derivatives thereof
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
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- H—ELECTRICITY
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/447—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from acrylic compounds
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/448—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from other vinyl compounds
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Abstract
The invention discloses a cable material capable of being immersed in a fluorinated cooling liquid and a preparation method thereof, wherein the cable material capable of being immersed in the fluorinated cooling liquid comprises the following components in percentage by mass: 10-20% of ethylene-vinyl acetate copolymer, 20-40% of ethylene-ethyl acrylate copolymer, 20-30% of butadiene-acrylonitrile rubber, 20-30% of butyl acrylate, 0.01-0.1% of dibenzoyl peroxide, 0.01-0.1% of tert-butyl peroxybenzoate and 1-3% of antioxidant auxiliary agent. The invention has the advantages that the cable material product can be immersed in the fluorinated cooling liquid, the appearance is flat and smooth, the electric insulation performance is good, meanwhile, after the cable product is installed on the server, the cable product can be immersed in the fluorinated cooling liquid for a long time, the phenomenon of plastic swelling or plasticizer extraction can not occur, the cable product and the server can be immersed in the fluorinated cooling liquid together, the server can be ensured to work stably for a long time, the photoelectric signal transmission can not be influenced, the plasticizer can not be dissolved to release the plasticizer and the like, and other materials can not be damaged.
Description
Technical Field
The invention belongs to the technical field of wire and cable materials, and particularly relates to a cable material capable of being immersed in fluorinated cooling liquid and a preparation method thereof.
Background
In the prior art, the cable for the server is usually made of polyvinyl chloride or vulcanized rubber. Both of these types of products inevitably require the addition of plasticisers/softening oils to the material to soften the molecular chains of the polymer during manufacture.
However, the fluorinated cooling liquid has strong compatibility, and the plasticizer/softening oil in the fluorinated cooling liquid can be easily extracted. This can lead to several problems:
1. polyvinyl chloride or vulcanized rubber suffers from severe deterioration of mechanical and electrical properties due to loss of plasticizer/softening oil;
2. the fluorinated cooling fluid replaces the loss of plasticizer/softening oil in polyvinyl chloride or vulcanized rubber and can cause severe swelling of the material. When the electric wire is bent, the electric wire is cracked, so that the insulativity of the cable and the transmission of optical and electric signals are influenced;
3. the extracted plasticizer/softening oil can mix in the fluorinated coolant, flow to other electronic components, contaminate other components, interfere with proper operation of the equipment, and cause failure.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above and/or other problems occurring in the prior art of wire and cable materials.
Therefore, the invention aims to overcome the defects in the prior art of wire and cable materials and provide a cable material capable of being immersed in fluorinated cooling liquid and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme: a cable material which can be immersed in a fluorinated cooling liquid.
The composite material is characterized by comprising the following components in percentage by mass:
10-20% of ethylene-vinyl acetate copolymer (EVM), 20-40% of ethylene-ethyl acrylate copolymer (EEA), 20-30% of butyl cyanide rubber, 20-30% of butyl acrylate, 0.01-0.1% of dibenzoyl peroxide (BPO), 0.01-0.1% of tert-Butyl Peroxybenzoate (BPB), 1-3% of antioxidant additive, and the sum of the mass percentages of all the components is 100%.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the ethylene-vinyl acetate copolymer (EVM) is 1.08g/cm 3 The melt index is less than or equal to 6.0g/10min (190 ℃ is 2.16kg), and the VA content is 68-72%.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the ethylene-ethyl acrylate copolymer (EEA) has a density of 0.940g/cm 3 29 percent of acrylic acid vinyl ester, 5 to 8g/10min (190 ℃ C. is 2.16kg) of melt index and less than or equal to 40 ℃ of Vicat softening point.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the Mooney viscosity of the butadiene-acrylonitrile rubber is 45 +/-2 MU, the acrylonitrile content is 33 +/-1 percent, and the saponification degree is less than or equal to 0.6 percent.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the purity of the butyl acrylate is more than or equal to 99.5 percent, the acidity is less than or equal to 0.01 percent, and the water content is less than or equal to 0.05 percent.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the dibenzoyl peroxide (BPO) is technical grade with purity more than 99 percent and is white powder in appearance.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the tert-Butyl Peroxybenzoate (BPB) is industrial grade, has the purity of more than or equal to 99 percent and is light yellow liquid.
As a preferable embodiment of the cable material submersible in the fluorinated cooling liquid according to the present invention, wherein: the antioxidant additive is prepared by mixing bis (2-methyl-5-tert-butyl-4-hydroxyphenyl) thioether and tetra (2, 4-di-tert-butylphenol) -4, 4-biphenyl diphosphite according to the mass ratio of 1: 1.
It is a further object of the present invention to overcome the deficiencies of the prior art and to provide a method for preparing a cable material that can be immersed in a fluorinated cooling fluid.
In order to solve the technical problems, the invention provides the following technical scheme: a preparation method of a cable material capable of being immersed in a fluorinated cooling liquid comprises the following steps,
in the first step, weighing various components according to mass percent, putting butyl acrylate and an initiator tert-Butyl Peroxybenzoate (BPB) into a reaction kettle, setting the temperature to be 30 ℃, starting low-speed stirring (120rpm), and mixing for 5 min. Then, the cyanogen butadiene rubber and dibenzoyl peroxide (BPO) are also put into a reaction kettle, and the temperature is increased at the speed of 2 ℃/min; when the temperature is raised to 80 ℃, adding ethylene-vinyl acetate copolymer (EVM), ethylene-ethyl acrylate copolymer (EEA) and antioxidant into a reaction kettle, starting high-speed stirring (200rpm), keeping the temperature rise speed of 2 ℃/min until the temperature reaches 150 ℃, and keeping the temperature for 5min to obtain soft jelly;
secondly, putting the mixed soft jelly obtained in the first step into a double-screw extruder for extrusion, setting a conical forced feeder on the double screws to be 140 ℃, and feeding the jelly into the double-screw extruder through the conical forced feeder; the temperature of the twin-screw extruder was: 130-145 ℃ of a first area, 130-145 ℃ of a second area, 130-145 ℃ of a third area, 130-145 ℃ of a fourth area, 130-145 ℃ of a fifth area, 130-145 ℃ of a sixth area, 130-145 ℃ of a seventh area, 130-145 ℃ of an eighth area, 130-145 ℃ of a ninth area, 140-155 ℃ of a die head, and 0.1-0.2 ATM of a vacuum pump pressure is set; through the process, the cable material extruded and molded into granules can be obtained and packaged after air cooling.
As a preferable embodiment of the preparation method of the cable material capable of being immersed in the fluorinated cooling liquid, the method comprises the following steps: the granular cable material finally obtained in the preparation of the cable material is cylindrical, the length of the granular cable material is 0.5cm, and the diameter of the bottom surface of the granular cable material is 0.2-0.3 cm.
The invention has the beneficial effects that:
(1) butyl acrylate and ethylene-vinyl acetate copolymer (EVM) with high VA content are selected as softeners; both materials are strongly polar materials and are almost insoluble in fluorinated cooling fluids.
(2) By controlling the dosage of the initiator and the reaction time, butyl acrylate and ethylene vinyl acetate copolymer (EVM) with higher reaction activity are partially polymerized, and the extraction resistance of the fluorination-resistant cooling liquid is further improved.
(3) By compounding the initiator, the crosslinking effect can be continuously generated at different temperatures, the crosslinking density of the material is improved, the possibility of the fluorinated cooling liquid entering a molecular chain is reduced, and the stability of the material is improved.
(4) By controlling the temperature rise speed of the reaction kettle, the reaction speed can be accurately controlled, and the defects caused by overlarge local crosslinking density can be avoided.
(5) By feeding materials in different times, the high-activity softening agent and the low-temperature catalyst can react firstly to obtain pre-crosslinking. After the butyl acrylate serving as the high-activity softener is fully reacted, other materials are added, the temperature is gradually increased, and the polymerization reaction is carried out.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, specific embodiments thereof are described in detail below with reference to examples of the specification.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
A cable material capable of being immersed in fluorinated cooling liquid comprises the following components in percentage by mass: 17 percent of ethylene-vinyl acetate copolymer (EVM), 29 percent of ethylene-ethyl acrylate copolymer (EEA), 27 percent of butyl cyanide rubber, 25 percent of butyl acrylate, 0.07 percent of dibenzoyl peroxide (BPO), 0.07 percent of tert-Butyl Peroxybenzoate (BPB) and 1.86 percent of antioxidant additive, wherein the sum of the mass percentages of the components is 100 percent. (ii) a
Wherein the ethylene-vinyl acetate copolymer (EVM) is 1.08g/cm 3 Melt index 5.8g/10min (190 ℃ C. 2.16kg), VA content 70%; ethylene-Ethyl acrylate copolymer (EEA) Density 0.940g/cm 3 29% vinyl acrylate content, 6.8g/10min melt index (190 ℃ C. 2.16kg), 38 ℃ Vicat softening point; the Mooney viscosity of the butadiene-acrylonitrile rubber is 46MU, the content of acrylonitrile is 32 percent, and the saponification degree is 0.5 percent; the purity of butyl acrylate is 99.7 percent, the acidity is 0.009 percent, and the water content is 0.04 percent; dibenzoyl peroxide (BPO) is 99.3% technical purity and is a white powder in appearance; tert-Butyl Peroxybenzoate (BPB) is of industrial grade, has the purity of 99.3 percent and is light yellow liquid; the antioxidant additive is prepared by mixing bis (2-methyl-5-tert-butyl-4-hydroxyphenyl) thioether and tetra (2, 4-di-tert-butylphenol) -4, 4-biphenyl diphosphite according to the mass ratio of 1: 1;
the method for preparing the cable material capable of being immersed in the fluorinated cooling liquid comprises a cable material preparation process and a cable extrusion manufacturing process, and specifically comprises the following steps:
preparing a cable material: weighing various components according to the mass percentage, firstly putting butyl acrylate and initiator tert-Butyl Peroxybenzoate (BPB) into a reaction kettle, setting the temperature at 30 ℃, starting low-speed stirring (120rpm), and mixing for 5 min. Then, the cyanogen butadiene rubber and dibenzoyl peroxide (BPO) are also put into the reaction kettle, and the temperature is increased at the speed of 2 ℃/min. When the temperature is raised to 80 ℃, adding ethylene-vinyl acetate copolymer (EVM), ethylene-ethyl acrylate copolymer (EEA) and antioxidant into a reaction kettle, starting high-speed stirring (200rpm), keeping the temperature rise speed of 2 ℃/min until the temperature reaches 150 ℃, and keeping the temperature for 5min to obtain soft jelly. And secondly, putting the mixed soft jelly obtained in the first step into a double-screw extruder for extrusion, setting a conical forced feeder on the double screws to be 140 ℃, and feeding the jelly into the double-screw extruder through the conical forced feeder. The temperature of the twin-screw extruder was: 130-145 ℃ of the first zone, 130-145 ℃ of the second zone, 130-145 ℃ of the third zone, 130-145 ℃ of the fourth zone, 130-145 ℃ of the fifth zone, 130-145 ℃ of the sixth zone, 130-145 ℃ of the seventh zone, 130-145 ℃ of the eighth zone, 130-145 ℃ of the ninth zone, 140-155 ℃ of the die head, and 0.1-0.2 ATM of the vacuum pump pressure is set. Through the process, the cable material extruded and molded into a particle shape can be obtained, and the cable material is packaged after air cooling;
the product prepared in example 1 was subjected to related test experiments with polyvinyl chloride cable materials and vulcanized rubber cable materials, and the comparison results are shown in table 1.
TABLE 1 comparative results of test experiments
As shown in table 1, by comparing the two indexes 1-2, the tensile strength and elongation at break of the polyvinyl chloride cable material and the vulcanized rubber cable material soaked in the fluorinated cooling liquid are obviously lower than those of the product in example 1, which indicates that the mechanical properties of the product in example 1 after long-time soaking can still be stable; the comparison of bending experiments of the number 3 shows that the cable made of the product in the embodiment 1 can not crack after being soaked in a bending mode, so that the long-term safe use of the cable can be ensured, and the cable made of the polyvinyl chloride cable material and the vulcanized rubber cable material can not be stably used in the fluorinated cooling liquid for a long time due to the bending cracking phenomenon after being soaked; as can be seen by comparing the volume change rate index of No. 4, the volume change rate of example 1 is very small, indicating that the fluorinated coolant did not enter the product of example 1. The volume change rates of the polyvinyl chloride cable material and the vulcanized rubber cable material are large, which indicates that the fluorinated cooling liquid enters molecular chains of the two materials and destroys the molecular chains; by comparing the data of index 5, it can be seen how much plasticizer/softener is extracted by the fluorinated coolant after the different materials are soaked in the fluorinated coolant for a long time. Among them, the polyvinyl chloride cable material usually uses phthalate as plasticizer, and its extraction resistance is stronger than that of straight chain alkane oil used for vulcanized rubber cable material, but after long-term use in example 1, the purity of the fluorinated cooling liquid is obviously better than that of the polyvinyl chloride cable material, and almost no plasticizer/softener is extracted out, thus ensuring safe and stable use of other electronic equipment soaked in the fluorinated cooling liquid together.
Example 2:
a cable material capable of being immersed in fluorinated cooling liquid comprises the following components in percentage by mass: 13 percent of ethylene-vinyl acetate copolymer (EVM), 36 percent of ethylene-ethyl acrylate copolymer (EEA), 225 percent of butyl cyanide rubber, 23 percent of butyl acrylate, 0.08 percent of dibenzoyl peroxide (BPO), 0.08 percent of tert-Butyl Peroxybenzoate (BPB) and 2.84 percent of antioxidant additive, wherein the sum of the mass percentages of the components is 100 percent. (ii) a
Wherein the ethylene-vinyl acetate copolymer (EVM) is 1.08g/cm 3 Melt index 5.4g/10min (190 ℃ C. 2.16kg), VA content 70%; ethylene-Ethyl acrylate copolymer (EEA) Density 0.940g/cm 3 29% vinyl acrylate content, 6.6g/10min melt index (190 ℃ C. 2.16kg), 39 ℃ Vicat softening point; the Mooney viscosity of the butadiene-acrylonitrile rubber is 46MU, the acrylonitrile content is 33 percent, and the saponification degree is 0.5 percent; the purity of butyl acrylate is 99.6 percent, the acidity is 0.009 percent, and the water content is 0.04 percent; dibenzoyl peroxide (BPO) is 99.6% technical purity and is a white powder in appearance; tert-Butyl Peroxybenzoate (BPB) is of industrial grade, has the purity of 99.2 percent and is light yellow liquid; the antioxidant additive is prepared by mixing bis (2-methyl-5-tert-butyl-4-hydroxyphenyl) thioether and tetra (2, 4-di-tert-butylphenol) -4, 4-biphenyl diphosphite according to the mass ratio of 1: 1;
the method for preparing the cable material capable of being immersed in the fluorinated cooling liquid comprises a cable material preparation process and a cable extrusion manufacturing process, and specifically comprises the following steps:
preparing a cable material: weighing various components according to the mass percentage, firstly putting butyl acrylate and initiator tert-Butyl Peroxybenzoate (BPB) into a reaction kettle, setting the temperature at 30 ℃, starting low-speed stirring (120rpm), and mixing for 5 min. Then, the cyanogen butadiene rubber and dibenzoyl peroxide (BPO) are also put into the reaction kettle, and the temperature is increased at the speed of 2 ℃/min. When the temperature is raised to 80 ℃, adding ethylene-vinyl acetate copolymer (EVM), ethylene-ethyl acrylate copolymer (EEA) and antioxidant into a reaction kettle, starting high-speed stirring (200rpm), keeping the temperature rise speed of 2 ℃/min until the temperature reaches 150 ℃, and keeping the temperature for 5min to obtain soft jelly. And secondly, putting the mixed soft jelly obtained in the first step into a double-screw extruder for extrusion, setting a conical forced feeder on the double screws to be 140 ℃, and feeding the jelly into the double-screw extruder through the conical forced feeder. The temperature of the twin-screw extruder was: 130-145 ℃ of the first zone, 130-145 ℃ of the second zone, 130-145 ℃ of the third zone, 130-145 ℃ of the fourth zone, 130-145 ℃ of the fifth zone, 130-145 ℃ of the sixth zone, 130-145 ℃ of the seventh zone, 130-145 ℃ of the eighth zone, 130-145 ℃ of the ninth zone, 140-155 ℃ of the die head, and 0.1-0.2 ATM of the vacuum pump pressure is set. Through the process, the cable material extruded and molded into a particle shape can be obtained, and the cable material is packaged after air cooling;
the product prepared in example 2 was subjected to related test experiments with polyvinyl chloride cable materials and vulcanized rubber cable materials, and the comparison results are shown in table 2.
Table 2 comparative results of the test experiments
As shown in table 2, comparing the two indexes 1-2, it can be seen that the tensile strength and elongation at break of the polyvinyl chloride cable material and the vulcanized rubber cable material soaked in the fluorinated coolant are significantly lower than those of the product in example 1, which indicates that the mechanical properties of the product in example 2 after long-term soaking can still be kept stable; the comparison of bending experiments of the number 3 shows that the cable made of the product in the embodiment 2 can not crack after being soaked in bending, so that the long-term safe use of the cable can be ensured, and the cable made of the polyvinyl chloride cable material and the vulcanized rubber cable material can not be stably used in the fluorinated cooling liquid for a long time due to the bending cracking phenomenon after being soaked; as can be seen by comparing the volume change rate index of No. 4, the volume change rate of example 2 is very small, indicating that the fluorinated coolant failed to enter the product of example 2. The volume change rates of the polyvinyl chloride cable material and the vulcanized rubber cable material are large, which indicates that the fluorinated cooling liquid enters molecular chains of the two materials and destroys the molecular chains; by comparing the data of index 5, it can be seen how much plasticizer/softener is extracted by the fluorinated coolant after the different materials are soaked in the fluorinated coolant for a long time. Wherein, the polyvinyl chloride cable material usually uses phthalate esters as the plasticizer, and the extraction resistance of the polyvinyl chloride cable material is stronger than that of straight chain alkane oil used for vulcanized rubber cable materials, but after the polyvinyl chloride cable material is used for a long time in the embodiment 2, the purity of the fluorinated cooling liquid is obviously better than that of the polyvinyl chloride cable material, and almost no plasticizer/softening agent is extracted, thereby ensuring the safe and stable use of other electronic equipment which is soaked in the fluorinated cooling liquid together.
Example 3:
a cable material capable of being immersed in fluorinated cooling liquid comprises the following components in percentage by mass: 15 percent of ethylene-vinyl acetate copolymer (EVM), 31 percent of ethylene-ethyl acrylate copolymer (EEA), 28 percent of butyl cyanide rubber, 24 percent of butyl acrylate, 0.08 percent of dibenzoyl peroxide (BPO), 0.08 percent of tert-Butyl Peroxybenzoate (BPB) and 1.84 percent of antioxidant additive, wherein the sum of the mass percentages of the components is 100 percent. (ii) a
Wherein the ethylene-vinyl acetate copolymer (EVM) is 1.08g/cm 3 Melt index 5.8g/10min (190 ℃ C. 2.16kg), VA content 70%; ethylene-Ethyl acrylate copolymer (EEA) Density 0.940g/cm 3 29% vinyl acrylate content, 6.8g/10min melt index (190 ℃ C. 2.16kg), 38 ℃ Vicat softening point; the Mooney viscosity of the butadiene-acrylonitrile rubber is 46MU, the content of acrylonitrile is 32 percent, and the saponification degree is 0.5 percent; the purity of butyl acrylate is 99.7 percent,acidity 0.009%, water content 0.04%; dibenzoyl peroxide (BPO) is 99.3% technical purity and is a white powder in appearance; tert-Butyl Peroxybenzoate (BPB) is of industrial grade, has the purity of 99.3 percent and is light yellow liquid; the antioxidant additive is prepared by mixing bis (2-methyl-5-tert-butyl-4-hydroxyphenyl) thioether and tetrakis (2, 4-di-tert-butylphenol) -4, 4-biphenyl diphosphite according to the mass ratio of 1: 1;
the method for preparing the cable material capable of being immersed in the fluorinated cooling liquid comprises a cable material preparation process and a cable extrusion manufacturing process, and specifically comprises the following steps:
preparing a cable material: weighing various components according to the mass percentage, firstly putting butyl acrylate and initiator tert-Butyl Peroxybenzoate (BPB) into a reaction kettle, setting the temperature at 30 ℃, starting low-speed stirring (120rpm), and mixing for 5 min. Then, the cyanogen butadiene rubber and dibenzoyl peroxide (BPO) are also put into the reaction kettle, and the temperature is increased at the speed of 2 ℃/min. When the temperature is raised to 80 ℃, adding ethylene-vinyl acetate copolymer (EVM), ethylene-ethyl acrylate copolymer (EEA) and antioxidant into a reaction kettle, starting high-speed stirring (200rpm), keeping the temperature rise speed of 2 ℃/min until the temperature reaches 150 ℃, and keeping the temperature for 5min to obtain soft jelly. And secondly, putting the mixed soft jelly obtained in the first step into a double-screw extruder for extrusion, setting a conical forced feeder on the double screws to be 140 ℃, and feeding the jelly into the double-screw extruder through the conical forced feeder. The temperature of the twin-screw extruder was: 130-145 ℃ of the first zone, 130-145 ℃ of the second zone, 130-145 ℃ of the third zone, 130-145 ℃ of the fourth zone, 130-145 ℃ of the fifth zone, 130-145 ℃ of the sixth zone, 130-145 ℃ of the seventh zone, 130-145 ℃ of the eighth zone, 130-145 ℃ of the ninth zone, 140-155 ℃ of the die head, and 0.1-0.2 ATM of the vacuum pump pressure is set. Through the process, the cable material extruded and molded into a particle shape can be obtained, and the cable material is packaged after air cooling;
the product prepared in example 3 was subjected to related test experiments with polyvinyl chloride cable materials and vulcanized rubber cable materials, and the comparison results are shown in table 3.
TABLE 3 comparative results of the test experiments
As shown in table 3, comparing the two indexes 1-2, it can be seen that the tensile strength and elongation at break of the polyvinyl chloride cable material and the vulcanized rubber cable material soaked in the fluorinated coolant are significantly lower than those of the product in example 3, which indicates that the mechanical properties of the product in example 3 after long-term soaking can still be stable; the comparison of bending experiments of the number 3 shows that the cable made of the product in the embodiment 3 can not crack after being soaked in a bending mode, so that the long-term safe use of the cable can be ensured, and the cable made of the polyvinyl chloride cable material and the vulcanized rubber cable material can not be stably used in the fluorinated cooling liquid for a long time due to the bending cracking phenomenon after being soaked; as can be seen by comparing the volume change rate index of reference No. 4, the volume change rate of example 3 is very small, indicating that the fluorinated coolant failed to enter the product of example 1. The volume change rates of the polyvinyl chloride cable material and the vulcanized rubber cable material are large, which indicates that the fluorinated cooling liquid enters molecular chains of the two materials and destroys the molecular chains; by comparing the data of index 5, it can be seen how much plasticizer/softener is extracted by the fluorinated coolant after the different materials are soaked in the fluorinated coolant for a long time. Among them, the polyvinyl chloride cable material usually uses phthalate as plasticizer, and its extraction resistance is stronger than that of straight chain alkane oil used for vulcanized rubber cable material, but after long-term use in example 3, the purity of the fluorinated cooling liquid is obviously better than that of the polyvinyl chloride cable material, and almost no plasticizer/softener is extracted out, thus ensuring safe and stable use of other electronic equipment soaked in the fluorinated cooling liquid together.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may 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, which should be covered by the claims of the present invention.
Claims (10)
1. A cable material capable of being immersed in a fluorinated coolant, which is characterized in that: the composition comprises the following components in percentage by mass: 10-20% of ethylene-vinyl acetate copolymer, 20-40% of ethylene-ethyl acrylate copolymer, 20-30% of butadiene-acrylonitrile rubber, 20-30% of butyl acrylate, 0.01-0.1% of dibenzoyl peroxide, 0.01-0.1% of tert-butyl peroxybenzoate and 1-3% of antioxidant auxiliary agent, wherein the sum of the mass percentages of the components is 100%.
2. A cable material according to claim 1, which is submersible in a fluorinated cooling liquid, characterized in that: the ethylene-vinyl acetate copolymer is 1.08g/cm 3 The melt index is less than or equal to 6.0g/10min (190 ℃ is 2.16kg), and the VA content is 68-72%.
3. A cable material according to claim 1, which is submersible in a fluorinated cooling liquid, characterized in that: the density of the ethylene-ethyl acrylate copolymer is 0.940g/cm 3 29 percent of acrylic acid vinyl ester, 5 to 8g/10min (190 ℃ C. is 2.16kg) of melt index and less than or equal to 40 ℃ of Vicat softening point.
4. A cable material submersible in a fluorinated cooling fluid according to claim 1, wherein: the Mooney viscosity of the butadiene-acrylonitrile rubber is 45 +/-2 MU, the acrylonitrile content is 33 +/-1 percent, and the saponification degree is less than or equal to 0.6 percent.
5. A cable material according to claim 1, which is submersible in a fluorinated cooling liquid, characterized in that: the purity of the butyl acrylate is more than or equal to 99.5 percent, the acidity is less than or equal to 0.01 percent, and the water content is less than or equal to 0.05 percent.
6. A cable material according to claim 1, which is submersible in a fluorinated cooling liquid, characterized in that: the dibenzoyl peroxide has an industrial grade purity of more than 99 percent and is white powder in appearance.
7. A cable material according to claim 1, which is submersible in a fluorinated cooling liquid, characterized in that: the tert-butyl peroxybenzoate is industrial grade, the purity is more than or equal to 99 percent, and the appearance is light yellow liquid.
8. A cable material according to claim 1, which is submersible in a fluorinated cooling liquid, characterized in that: the antioxidant additive is prepared by mixing bis (2-methyl-5-tert-butyl-4-hydroxyphenyl) thioether and tetra (2, 4-di-tert-butylphenol) -4, 4-biphenyl diphosphite according to the mass ratio of 1: 1.
9. A method of preparing a cable material according to claim 1, which is submersible in a fluorinated cooling liquid, wherein: the method specifically comprises the following steps:
preparing a cable material: weighing various components according to the mass percentage, firstly putting butyl acrylate and an initiator tert-butyl peroxybenzoate into a reaction kettle, setting the temperature at 30 ℃, starting low-speed stirring (120rpm), and mixing for 5 min. Then, the cyanogen butadiene rubber and the dibenzoyl peroxide are also put into a reaction kettle, and the temperature is increased at the speed of 2 ℃/min. When the temperature is raised to 80 ℃, adding the ethylene-vinyl acetate copolymer, the ethylene-ethyl acrylate copolymer and the antioxidant into a reaction kettle, starting high-speed stirring (200rpm), keeping the temperature rise speed of 2 ℃/min until the temperature reaches 150 ℃, and preserving the heat for 5min to obtain a soft jelly. And step two, putting the mixed soft jelly obtained in the step one into a double-screw extruder for extrusion, setting a conical forced feeder on the double screws to be 140 ℃, and feeding the jelly into the double-screw extruder through the conical forced feeder. The temperature of the twin-screw extruder was: 130-145 ℃ of the first zone, 130-145 ℃ of the second zone, 130-145 ℃ of the third zone, 130-145 ℃ of the fourth zone, 130-145 ℃ of the fifth zone, 130-145 ℃ of the sixth zone, 130-145 ℃ of the seventh zone, 130-145 ℃ of the eighth zone, 130-145 ℃ of the ninth zone, 140-155 ℃ of the die head, and 0.1-0.2 ATM of the vacuum pump pressure is set. Through the process, the cable material extruded and molded into granules can be obtained and packaged after air cooling.
10. A method according to claim 8, wherein the cable material is immersed in a fluorinated cooling fluid, and the method comprises the following steps: the granular cable material finally obtained in the preparation of the cable material is cylindrical, the length of the granular cable material is 0.5cm, and the diameter of the bottom surface of the granular cable material is 0.2-0.3 cm.
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