CN107337837A - A kind of high flame retardant insulating materials and preparation method thereof - Google Patents
A kind of high flame retardant insulating materials and preparation method thereof Download PDFInfo
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- CN107337837A CN107337837A CN201710583358.5A CN201710583358A CN107337837A CN 107337837 A CN107337837 A CN 107337837A CN 201710583358 A CN201710583358 A CN 201710583358A CN 107337837 A CN107337837 A CN 107337837A
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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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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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
- H01B3/441—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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a kind of high flame retardant insulating materials, includes following raw material according to parts by weight：20 ~ 40 parts of polyethylene, 7 ~ 14 parts of amination diamond, 3 ~ 6 parts of butyl rubber, 3 ~ 5 parts of inorganic glass fiber, 7 ~ 8 parts of ethylene propylene diene rubber, 3 ~ 10 parts of polytetrafluoroethylene powder, 3 ~ 10 parts of alkali-free glass fiber cloth, 3 ~ 10 parts of epoxy resin, 3 ~ 10 parts of epoxy curing agent, 1.5 ~ 3.5 parts of antioxidant, 3 ~ 9 parts of fire retardant, 0.5 ~ 5.5 part of plasticizer.The present invention provides a kind of high flame retardant insulating materials and preparation method thereof, obtained insulating materials is used for cable and wire or cable installation, with good high temperature resistant, high fire-retardance and weatherability, avoid and shorten the service life of cable and wire because power cable is chronically at outdoor.
Description
Technical field
The invention belongs to insulating materials field, and in particular to a kind of high flame retardant insulating materials and preparation method thereof.
Background technology
In recent years, China's electric utility is quickly grown, and network system working voltage grade improves constantly, and network size is progressively
Expansion, superelevation or UHV transmission network are the skeleton and core for the intelligent grid that national grid is being made with all strength, are built special
High-voltage transmission network can significantly lift the conveying capacity of China's power network, reduce the loss of long range power Transmission, but higher
Voltage class and direct current transportation significant challenge is proposed to the security reliability for being widely used in the insulating materials of electrical equipment,
High Performance Insulation material is to form high pressure, extra-high voltage electric transmission and transformation equipment and the technological core at networking with crucial, its electric property
Height and the voltage class and safety for being stably directly connected to whole power transmission network, therefore, High Performance Insulation material is developed, it is right
Building security is reliable, the DC ultra-high-voltage of stability and high efficiency it is defeated become network, lifting China's transmission of electricity it is horizontal and save resource have it is important
Meaning, existing power cable insulating materials is anticorrosive, high heat resistance ability, influences the service life of power cable.
The content of the invention
In view of the above-mentioned problems, the technical problem to be solved in the present invention is to provide a kind of high flame retardant insulating materials and its preparation
Method.
To achieve the above object, the technical scheme is that：A kind of high flame retardant insulating materials, includes according to parts by weight
Following raw material：20 ~ 40 parts of polyethylene, 7 ~ 14 parts of amination diamond, 3 ~ 6 parts of butyl rubber, 3 ~ 5 parts of inorganic glass fiber, ternary
7 ~ 8 parts of EP rubbers, 3 ~ 10 parts of polytetrafluoroethylene powder, 3 ~ 10 parts of alkali-free glass fiber cloth, 3 ~ 10 parts of epoxy resin, epoxy resin cure
3 ~ 10 parts of agent, 1.5 ~ 3.5 parts of antioxidant, 3 ~ 9 parts of fire retardant, 0.5 ~ 5.5 part of plasticizer.
Preferably, following raw material is included according to parts by weight：20 parts of polyethylene, 7 parts of amination diamond, 3 parts of butyl rubber, nothing
3 parts of machine glass fibre, 7 parts of ethylene propylene diene rubber, 3 parts of polytetrafluoroethylene powder, 3 parts of alkali-free glass fiber cloth, 3 parts of epoxy resin, epoxy
3 parts of resin curing agent, 1.5 parts of antioxidant, 3 parts of fire retardant, 0.5 part of plasticizer.
Preferably, the epoxy resin is bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin
And novolac type epoxy resin any of or their mixture.
Preferably, the fire retardant is a kind of in aluminium hydroxide, magnesium hydroxide and antimony oxide or theirs is mixed
Compound.
Preferably, the thickener is sodium bentonite, Silica hydrogel, methylcellulose, hydroxypropyl methyl cellulose, carboxylic first
Base sodium cellulosate, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, Huang
A kind of or their mixture in virgin rubber, soybean protein glue, natural rubber, lanolin.
Preferably, the epoxy curing agent is in di-2-ethylhexylphosphine oxide hexamethylene alkanamine, polyethylene polyamine, diethyl amino propylamine
One or more.
A kind of preparation method of high flame retardant insulating materials, is mainly included the following steps that：
Step 1：Raw material disposal, first polyethylene and amination diamond are put into 90 ~ 110 DEG C of vacuum drying chambers, 0.05 ~
30 ~ 45min of heat preservation and dryness under 0.08MPa vacuum, then other raw material components are put into 60 ~ 70 DEG C of vacuum tanks, 0.05 ~
30 ~ 45min of insulation pumping under 0.08MPa vacuum；
Step 2：Batch mixing, by the polyethylene after drying process in step 1, amination diamond, butyl rubber, inorganic glass fiber,
Ethylene propylene diene rubber, polytetrafluoroethylene powder, alkali-free glass fiber cloth are added in electric blender, after mixing 20 ~ 40min, Xiang Zheng
Epoxy resin, epoxy curing agent are slowly added to by formula in the mixture of stirring, after being thoroughly mixed, adds antioxygen
Agent, fire retardant and plasticizer stir 5 ~ 10min to uniform；
Step 3：Bubble removing, by step 2 be well mixed mixture be put into 50 ~ 60 DEG C of vacuum drying chamber to surface without
Foam；
Step 4：It curing molding, will obtain pouring into 50 ~ 70 DEG C of moulds without bubble mixt in step 3, then be warming up to 90~110
DEG C, 5~9h of heat preservation solidification, after being cooled to room temperature, it is stripped to obtain high flame retardant insulating materials.
Preferably, the vacuum in the vacuum drying chamber in the step 2 is 0.02 ~ 0.08MPa.
The beneficial effects of the present invention are：The present invention provides a kind of high flame retardant insulating materials and preparation method thereof, made
The insulating materials obtained is used for cable and wire or cable installation, has good high temperature resistant, high fire-retardance and weatherability, avoids
Shorten the service life of cable and wire because power cable is chronically at outdoor.The insulating materials of the present invention employs amination gold
Hard rock is as one of raw material, and using the method for solution blending, heating removal solvent is so that it is solidified into vacuum environment
Type obtains the insulating composite material of high flame retardant.Diamond particle by amination can be better than for the insulation integrity of raw material
Insulating materials using the diamond of oxidation as raw material.
A certain amount of plasticizer is added in the present invention, it is possible to increase the elasticity and toughness of insulating materials, anti-breakdown energy in addition
Power is strong, and bubble removing handling process is used in preparation method, by raw mixture be put into vacuum drying chamber to surface without
Foam, prevent entrained gas or bubble in insulating materials and influence the toughness and intensity of insulating materials.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and it is unlimited
The fixed present invention.
Embodiment 1
A kind of high flame retardant insulating materials, include following raw material according to parts by weight：20 parts of polyethylene, 7 parts of amination diamond, butyl
3 parts of rubber, 3 parts of inorganic glass fiber, 7 parts of ethylene propylene diene rubber, 3 parts of polytetrafluoroethylene powder, 3 parts of alkali-free glass fiber cloth, asphalt mixtures modified by epoxy resin
3 parts of fat, 3 parts of epoxy curing agent, 1.5 parts of antioxidant, 3 parts of fire retardant, 0.5 part of plasticizer.
The epoxy resin is bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin and linear
Phenol aldehyde type epoxy resin any of or their mixture.
The fire retardant is a kind of or their mixture in aluminium hydroxide, magnesium hydroxide and antimony oxide.
The thickener is sodium bentonite, Silica hydrogel, methylcellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose
Plain sodium, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthans,
A kind of or their mixture in soybean protein glue, natural rubber, lanolin.
The epoxy curing agent is one kind in di-2-ethylhexylphosphine oxide hexamethylene alkanamine, polyethylene polyamine, diethyl amino propylamine
It is or a variety of.
A kind of preparation method of high flame retardant insulating materials, is mainly included the following steps that：
Step 1：Raw material disposal, first polyethylene and amination diamond are put into 90 DEG C of vacuum drying chambers, in the true of 0.05MPa
Heat preservation and dryness 30min under reciprocal of duty cycle, then other raw material components are put into 60 DEG C of vacuum tanks, are incubated and are taken out under 0.05MPa vacuum
Gas 30min；
Step 2：Batch mixing, by the polyethylene after drying process in step 1, amination diamond, butyl rubber, inorganic glass fiber,
Ethylene propylene diene rubber, polytetrafluoroethylene powder, alkali-free glass fiber cloth are added in electric blender, after mixing 20min, to stirring
Be slowly added to epoxy resin, epoxy curing agent by formula in the mixture mixed, after being thoroughly mixed, add antioxidant,
Fire retardant and plasticizer stir 5min to uniform；
Step 3：Bubble removing, the mixture being well mixed in step 2 is put into 50 DEG C of vacuum drying chamber still to surface
Foam；
Step 4：It curing molding, will obtain pouring into 50 DEG C of moulds without bubble mixt in step 3, then be warming up to 90 DEG C, be incubated
Solidify 5h, after being cooled to room temperature, be stripped to obtain high flame retardant insulating materials.
The vacuum in vacuum drying chamber in the step 2 is 0.02MPa.
Embodiment 2
A kind of high flame retardant insulating materials, include following raw material according to parts by weight：30 parts of polyethylene, 10 parts of amination diamond, fourth
5 parts of base rubber, 4 parts of inorganic glass fiber, 7.5 parts of ethylene propylene diene rubber, 5 parts of polytetrafluoroethylene powder, 7 parts of alkali-free glass fiber cloth, ring
7 parts of oxygen tree fat, 6 parts of epoxy curing agent, 2.5 parts of antioxidant, 6 parts of fire retardant, 3.5 parts of plasticizer.
The epoxy resin is bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin and linear
Phenol aldehyde type epoxy resin any of or their mixture.
The fire retardant is a kind of or their mixture in aluminium hydroxide, magnesium hydroxide and antimony oxide.
The thickener is sodium bentonite, Silica hydrogel, methylcellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose
Plain sodium, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthans,
A kind of or their mixture in soybean protein glue, natural rubber, lanolin.
The epoxy curing agent is one kind in di-2-ethylhexylphosphine oxide hexamethylene alkanamine, polyethylene polyamine, diethyl amino propylamine
It is or a variety of.
A kind of preparation method of high flame retardant insulating materials, is mainly included the following steps that：
Step 1：Raw material disposal, first polyethylene and amination diamond are put into 100 DEG C of vacuum drying chambers, 0.07MPa's
Heat preservation and dryness 42min under vacuum, then other raw material components are put into 65 DEG C of vacuum tanks, protected under 0.06MPa vacuum
Temperature pumping 40min；
Step 2：Batch mixing, by the polyethylene after drying process in step 1, amination diamond, butyl rubber, inorganic glass fiber,
Ethylene propylene diene rubber, polytetrafluoroethylene powder, alkali-free glass fiber cloth are added in electric blender, after mixing 30min, to stirring
Be slowly added to epoxy resin, epoxy curing agent by formula in the mixture mixed, after being thoroughly mixed, add antioxidant,
Fire retardant and plasticizer stir 8min to uniform；
Step 3：Bubble removing, the mixture being well mixed in step 2 is put into 55 DEG C of vacuum drying chamber still to surface
Foam；
Step 4：It curing molding, will obtain pouring into 60 DEG C of moulds without bubble mixt in step 3, then be warming up to 100 DEG C, be incubated
Solidify 7h, after being cooled to room temperature, be stripped to obtain high flame retardant insulating materials.
The vacuum in vacuum drying chamber in the step 2 is 0.06MPa.
Embodiment 3
A kind of high flame retardant insulating materials, include following raw material according to parts by weight：40 parts of polyethylene, 14 parts of amination diamond, fourth
6 parts of base rubber, 5 parts of inorganic glass fiber, 8 parts of ethylene propylene diene rubber, 10 parts of polytetrafluoroethylene powder, 10 parts of alkali-free glass fiber cloth, ring
10 parts of oxygen tree fat, 10 parts of epoxy curing agent, 3.5 parts of antioxidant, 9 parts of fire retardant, 5.5 parts of plasticizer.
The epoxy resin is bisphenol A type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin and linear
Phenol aldehyde type epoxy resin any of or their mixture.
The fire retardant is a kind of or their mixture in aluminium hydroxide, magnesium hydroxide and antimony oxide.
The thickener is sodium bentonite, Silica hydrogel, methylcellulose, hydroxypropyl methyl cellulose, carboxymethyl cellulose
Plain sodium, hydroxyethyl cellulose, starch, gelatin, sodium alginate, casein, guar gum, chitosan, gum arabic, xanthans,
A kind of or their mixture in soybean protein glue, natural rubber, lanolin.
The epoxy curing agent is one kind in di-2-ethylhexylphosphine oxide hexamethylene alkanamine, polyethylene polyamine, diethyl amino propylamine
It is or a variety of.
A kind of preparation method of high flame retardant insulating materials, is mainly included the following steps that：
Step 1：Raw material disposal, first polyethylene and amination diamond are put into 110 DEG C of vacuum drying chambers, 0.08MPa's
Heat preservation and dryness 45min under vacuum, then other raw material components are put into 70 DEG C of vacuum tanks, protected under 0.08MPa vacuum
Temperature pumping 45min；
Step 2：Batch mixing, by the polyethylene after drying process in step 1, amination diamond, butyl rubber, inorganic glass fiber,
Ethylene propylene diene rubber, polytetrafluoroethylene powder, alkali-free glass fiber cloth are added in electric blender, after mixing 40min, to stirring
Be slowly added to epoxy resin, epoxy curing agent by formula in the mixture mixed, after being thoroughly mixed, add antioxidant,
Fire retardant and plasticizer stir 10min to uniform；
Step 3：Bubble removing, the mixture being well mixed in step 2 is put into 60 DEG C of vacuum drying chamber still to surface
Foam；
Step 4：It curing molding, will obtain pouring into 70 DEG C of moulds without bubble mixt in step 3, then be warming up to 110 DEG C, be incubated
Solidify 9h, after being cooled to room temperature, be stripped to obtain high flame retardant insulating materials.
The vacuum in vacuum drying chamber in the step 2 is 0.08MPa.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (8)
1. a kind of high flame retardant insulating materials, it is characterised in that include following raw material according to parts by weight：20 ~ 40 parts of polyethylene, amine
Change 7 ~ 14 parts of diamond, 3 ~ 6 parts of butyl rubber, 3 ~ 5 parts of inorganic glass fiber, 7 ~ 8 parts of ethylene propylene diene rubber, polytetrafluoroethylene powder
3 ~ 10 parts, 3 ~ 10 parts of alkali-free glass fiber cloth, 3 ~ 10 parts of epoxy resin, 3 ~ 10 parts of epoxy curing agent, 1.5 ~ 3.5 parts of antioxidant,
3 ~ 9 parts of fire retardant, 0.5 ~ 5.5 part of plasticizer.
2. a kind of high flame retardant insulating materials according to claim 1, it is characterised in that include following original according to parts by weight
Material：20 parts of polyethylene, 7 parts of amination diamond, 3 parts of butyl rubber, 3 parts of inorganic glass fiber, 7 parts of ethylene propylene diene rubber, poly- four
3 parts of PVF powder, 3 parts of alkali-free glass fiber cloth, 3 parts of epoxy resin, 3 parts of epoxy curing agent, 1.5 parts of antioxidant, fire retardant 3
Part, 0.5 part of plasticizer.
3. a kind of high flame retardant insulating materials according to claim 1, it is characterised in that the epoxy resin is bisphenol-A
Type epoxy resin, bisphenol f type epoxy resin, bisphenol-s epoxy resin and novolac type epoxy resin any of
Or their mixture.
4. a kind of high flame retardant insulating materials according to claim 1, it is characterised in that the fire retardant is hydroxide
A kind of or their mixture in aluminium, magnesium hydroxide and antimony oxide.
5. a kind of high flame retardant insulating materials according to claim 1, it is characterised in that the thickener is Na-bentonite
Soil, Silica hydrogel, methylcellulose, hydroxypropyl methyl cellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, starch, gelatin,
In sodium alginate, casein, guar gum, chitosan, gum arabic, xanthans, soybean protein glue, natural rubber, lanolin
A kind of or their mixture.
6. a kind of high flame retardant insulating materials according to claim 1, it is characterised in that the epoxy curing agent is
One or more in di-2-ethylhexylphosphine oxide hexamethylene alkanamine, polyethylene polyamine, diethyl amino propylamine.
7. a kind of preparation method of high flame retardant insulating materials, it is characterised in that mainly include the following steps that：
Step 1：Raw material disposal, first polyethylene and amination diamond are put into 90 ~ 110 DEG C of vacuum drying chambers, 0.05 ~
30 ~ 45min of heat preservation and dryness under 0.08MPa vacuum, then other raw material components are put into 60 ~ 70 DEG C of vacuum tanks, 0.05 ~
30 ~ 45min of insulation pumping under 0.08MPa vacuum；
Step 2：Batch mixing, by the polyethylene after drying process in step 1, amination diamond, butyl rubber, inorganic glass fiber,
Ethylene propylene diene rubber, polytetrafluoroethylene powder, alkali-free glass fiber cloth are added in electric blender, after mixing 20 ~ 40min, Xiang Zheng
Epoxy resin, epoxy curing agent are slowly added to by formula in the mixture of stirring, after being thoroughly mixed, adds antioxygen
Agent, fire retardant and plasticizer stir 5 ~ 10min to uniform；
Step 3：Bubble removing, by step 2 be well mixed mixture be put into 50 ~ 60 DEG C of vacuum drying chamber to surface without
Foam；
Step 4：It curing molding, will obtain pouring into 50 ~ 70 DEG C of moulds without bubble mixt in step 3, then be warming up to 90~110
DEG C, 5~9h of heat preservation solidification, after being cooled to room temperature, it is stripped to obtain high flame retardant insulating materials.
A kind of 8. preparation method of high flame retardant insulating materials according to claim 7, it is characterised in that the step 2
In vacuum drying chamber in vacuum be 0.02 ~ 0.08MPa.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108198659A (en) * | 2017-12-18 | 2018-06-22 | 常熟市鑫华电子科技有限公司 | High flexibility explores cable |
| CN108395673A (en) * | 2018-03-14 | 2018-08-14 | 合肥尚强电气科技有限公司 | Preparation method of insulating material for power equipment |
| CN111019293A (en) * | 2019-11-30 | 2020-04-17 | 无锡市明江保温材料有限公司 | Vacuum insulation material and preparation method thereof |
| CN113580600A (en) * | 2021-06-28 | 2021-11-02 | 广东景呈电力设备有限公司 | Production process of composite material street sign indicating number |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108198659A (en) * | 2017-12-18 | 2018-06-22 | 常熟市鑫华电子科技有限公司 | High flexibility explores cable |
| CN108395673A (en) * | 2018-03-14 | 2018-08-14 | 合肥尚强电气科技有限公司 | Preparation method of insulating material for power equipment |
| CN111019293A (en) * | 2019-11-30 | 2020-04-17 | 无锡市明江保温材料有限公司 | Vacuum insulation material and preparation method thereof |
| CN113580600A (en) * | 2021-06-28 | 2021-11-02 | 广东景呈电力设备有限公司 | Production process of composite material street sign indicating number |
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Application publication date: 20171110 |
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