CN111660588A - Preparation method of epoxy glass cloth reinforced insulation end ring - Google Patents
Preparation method of epoxy glass cloth reinforced insulation end ring Download PDFInfo
- Publication number
- CN111660588A CN111660588A CN202010381052.3A CN202010381052A CN111660588A CN 111660588 A CN111660588 A CN 111660588A CN 202010381052 A CN202010381052 A CN 202010381052A CN 111660588 A CN111660588 A CN 111660588A
- Authority
- CN
- China
- Prior art keywords
- glass cloth
- end ring
- epoxy
- epoxy resin
- glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
- C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/10—Silicon-containing compounds
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
Abstract
The invention discloses a preparation method of an epoxy glass cloth reinforced insulating end ring, which comprises the following steps: firstly, putting the glass cloth and the glass mat into an oven for baking; secondly, mixing inorganic filler and dispersant uniformly in a high-speed stirrer to prepare white slurry, wherein the inorganic filler is a mixture of titanium dioxide and needle-shaped wollastonite powder; compounding the alkali-free glass cloth and the glass felt together, and winding the glass cloth and the glass felt on a mold covered with a high-temperature film or a mold release agent by using a cloth winding machine; mixing the white slurry with epoxy resin and the like to prepare epoxy resin prepreg, and uniformly impregnating the epoxy resin prepreg on glass cloth; fifthly, curing, taking the die out of the oven after curing is finished, cooling, and stripping 2-3 layers of the outer surface; and (VI) repeating the steps from the third step to the fifth step for a plurality of times until the thickness of the end ring meets the requirement. The invention effectively solves the problem of interlayer shearing of the epoxy glass cloth reinforced insulating end ring for a long time, and the prepared insulating end ring has good use performance.
Description
The invention is a divisional application of Chinese patent application with application date of 2017, 12 and 5, application number of 2017112652739 and name of 'preparation method of epoxy glass cloth reinforced insulation end ring'.
Technical Field
The invention relates to the technical field of thin-wall dry-type transformer insulating materials, in particular to a preparation method of a glass cloth and glass felt composite reinforced epoxy insulating end ring.
Background
At present, two main reinforcing modes for manufacturing the epoxy insulation end ring are provided: glass cloth reinforcement and glass fiber reinforcement. The glass fiber reinforced epoxy insulation end ring has excellent electrical property, does not have the problem of interlayer shearing, and has higher overall mechanical strength; but the molding cycle is quite long, and special winding equipment is needed, so that the cost is 3-4 times higher than the glass cloth reinforcing cost. In the increasingly competitive insulation industry, market share is getting smaller and smaller. The glass cloth reinforced epoxy insulation end ring has excellent electrical property, simple manufacturing process and short molding period, does not need special equipment, greatly reduces the manufacturing cost, but has the problem of interlaminar shearing in the axial direction, causes the end ring to be subjected to layered fracture compared with the radial direction, and seriously influences the service performance. The problem of interlayer shearing of the epoxy glass cloth reinforced insulating end ring is solved, and the key point for promoting the further development of the industry is realized.
Disclosure of Invention
The invention aims to solve the problem of interlayer shearing of an epoxy glass cloth reinforced insulating end ring and provides a novel preparation method of the epoxy glass cloth reinforced insulating end ring.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of an epoxy glass cloth reinforced insulation end ring comprises the following steps:
putting the glass cloth and the glass felt into an oven, and baking at 60-80 ℃;
and (II) uniformly mixing an inorganic filler and a dispersing agent in a high-speed mixer according to the mass ratio of 1: 0.8-3 to prepare white slurry, wherein the inorganic filler is titanium dioxide and needle-shaped wollastonite powder according to the mass ratio of 1: 0.5-2 of a mixture;
thirdly, compounding the alkali-free glass cloth and the glass felt into a layer of glass felt according to a mode that the glass cloth is compounded into the layer of glass felt, and the bottom layer is the glass felt, and winding the glass felt on a mould coated with a high-temperature film or a release agent by using a cloth winding machine, wherein the number of winding turns is 30-40;
fourthly, mixing the white slurry with epoxy resin, a curing agent and a curing accelerator to prepare epoxy resin prepreg, putting the mould subjected to the third step into vacuum impregnation equipment, and uniformly impregnating the epoxy resin prepreg on glass cloth through a vacuum pressure impregnation process;
putting the mold subjected to the step (IV) into an oven, curing at 140-180 ℃, taking out the mold from the oven after curing is finished, cooling, and stripping 2-3 layers of the outer surface to make the surface smooth;
and (VI) repeating the steps from the third step to the fifth step for a plurality of times until the thickness of the end ring meets the requirement.
Further, in the step (one), the baking time is 24 hours or more, preferably 36 hours or more, and more preferably 48 hours or more. The baking temperature is preferably 60-70 ℃.
Preferably, the alkali-free glass cloth is roving alkali-free glass cloth with a single-layer thickness of 0.1-0.15 mm and a single-filament fineness of 40-60 dtex. In one embodiment according to the invention, the alkali-free glass cloth has a single-layer thickness of about 0.14 mm.
Preferably, the glass felt is an alkali-free glass fiber continuous needle punched felt, the single-layer thickness is 0.1-0.15 mm, and the filament number is 20-40 dtex. In one embodiment according to the invention, the glass mat has a single layer thickness of about 0.1 mm.
Preferably, in the step (II), the particle size of the titanium dioxide is 250-350 nm, the size of the acicular wollastonite powder is 1-10 microns, and the length-diameter ratio is greater than 10. In one embodiment, the titanium dioxide has a particle size of about 300 nanometers.
Preferably, in the step (two), the dispersant is a mixture of an organic silicon defoamer and two or more selected from ethyl acetate, butyl acetate and acetone, wherein the mass content of the organic silicon defoamer in the dispersant is 0.5-1.5%. In one embodiment, the silicone defoamer is present in the dispersant in an amount of about 1% by weight. The addition of the defoaming agent effectively prevents the foaming phenomenon in the dipping and curing process, so that the foaming phenomenon of the inner part of the insulating end ring is solved.
Preferably, the silicone defoamer is a silicone modified epoxy resin, such as commercially available shin Etsu ES-1001N.
Preferably, in the step (two), the weight ratio of the inorganic filler to the dispersant is 1: 1 to 3.
According to the invention, the high-temperature film can be a high-temperature polypropylene film, and the release agent can be a commercially available organic silicon release agent.
Preferably, the epoxy resin is a hydantoin epoxy resin or a phenolic-modified bisphenol a epoxy resin. Specifically, the phenolic-modified bisphenol A epoxy resin is preferably F-51 type or F-44 type.
Preferably, the curing agent is one or two of methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride and methyl nadic anhydride.
Preferably, the curing accelerator is a tertiary amine curing agent or an imidazole curing agent, wherein the tertiary amine curing agent can be, for example, N-dimethylbenzylamine, and the imidazole curing agent can be, for example, liquid 2-ethyl-4-methylimidazole.
Preferably, the preparation process of the epoxy resin prepreg comprises the following steps: baking epoxy resin in an oven to reduce the viscosity of the epoxy resin, mixing 30-50 parts of epoxy resin, 30-45 parts of curing agent, 10-25 parts of white slurry and 0.1-0.2 part of curing accelerator according to parts by weight, and dispersing by using a high-speed stirrer to prepare the epoxy resin prepreg. Wherein the baking temperature can be 70-80 ℃, and the stirring dispersion time is 5min for example.
Preferably, the white pulp is prepared by the following steps: and (3) putting the dispersing agent into a stirring barrel of a high-speed stirrer, starting stirring, heating to 50-70 ℃, then sequentially and slowly adding titanium dioxide and the needle-shaped wollastonite powder, and stirring at a high speed until the dispersing agent is uniformly dispersed to obtain the titanium dioxide-wollastonite powder.
According to one aspect of the invention, the vacuum pressure impregnation is carried out under the specific process conditions of the pressure of 0.06-0.08 MPa, the impregnation time of 3-5 times, preferably 4 times, and the time of 1-1.5 hours. The control of the pressure in the vacuum impregnation VPI process well solves the problem that the glass cloth is easy to wrinkle, and internal defects are reduced. The pressure control is very important, and the outer surface is easy to be starved due to the overhigh pressure; too low a pressure tends to cause a lack of glue on the inner surface, and also causes too long impregnation times and increased times.
According to another aspect of the present invention, in the step (v), the curing process is: controlling the rotating speed of the mold in the oven at 10-20 revolutions/min; controlling the temperature to be 160 +/-20 ℃; the time is 1.5 to 2.5 hours.
Preferably, the thickness of the end ring meets the requirement, and after solidification, the mold is taken out of the oven and is cooled for 50-100 min, and then demolding is carried out. And after demoulding, carrying out subsequent treatment such as cutting, stripping, polishing and the like according to the size requirement.
Due to the implementation of the scheme, compared with the prior art, the invention has the following advantages:
in the method for preparing the epoxy insulating end ring, the shearing stress between glass cloth layers is enhanced by adopting a composite winding mode of the glass felt and the glass cloth and combining the specific inorganic filler, so that the interlayer shearing problem of the glass cloth layers for a long time can be well solved, and the interlayer shearing stress is prevented from being layered and cracked. In addition, the invention has simple process, easy control, cheap and easily obtained raw materials, no special requirements on equipment and devices and high production efficiency.
Drawings
FIG. 1 is a schematic view of a composite winding mode of glass cloth and a glass mat, wherein 1, the glass cloth is wound; 2. a glass mat; 3. and (5) molding.
Detailed Description
The invention aims to solve the technical problem of providing a preparation method of a glass cloth and glass felt composite reinforced epoxy insulation end ring, so as to solve the long-term interlayer shearing problem of the epoxy glass cloth reinforced insulation end ring, prevent the end ring from being layered and cracked and improve the service performance.
In the invention, the glass cloth and the glass felt are wound in a composite mode, so that a layer of glass felt is arranged between the glass cloth layers, and the double-reinforcing effect of the glass felt and the inorganic filler is obtained. The inorganic filler is a mixture of titanium dioxide and acicular wollastonite powder. The titanium dioxide has good reinforcing effect, strong covering power and good appearance quality of the product; the wollastonite powder with large length-diameter ratio can greatly improve the reinforcing effect and enhance the mechanical property. The inorganic filler is dispersed in the liquid dispersant in advance and dispersed by a high-speed mixer to prepare white slurry. When the epoxy resin prepreg is prepared subsequently, the phenomenon of uneven dispersion can not occur.
The present invention will be described in further detail with reference to specific examples. It is to be understood that these examples are for the purpose of illustrating the general principles, essential features and advantages of the present invention, and the present invention is not limited by the following examples. The implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not indicated are generally the conditions in routine experiments. All the raw materials used in the examples are industrial products.
In the embodiment, the glass cloth is untwisted roving alkali-free glass cloth, the single-layer thickness is 0.14mm, and the single-fiber fineness is 40-60 dtex; the glass felt is an alkali-free glass fiber continuous needled felt, the single-layer thickness is 0.1mm, and the filament number is 20-40 dtex.
In an embodiment, the particle size of the titanium dioxide is about 300 nanometers, the size of the wollastonite powder is 1-10 micrometers, and the length-diameter ratio is greater than 10.
Example 1
A preparation method of an epoxy glass cloth reinforced insulation end ring comprises the following steps:
(1) and (3) putting the glass cloth and the glass felt into an oven, and baking for more than 48 hours at the temperature of 60 ℃.
(2) 1kg of Xinyue organic silicon modified epoxy resin ES-1001N is added into a mixture consisting of 50 kg of ethyl acetate and 49 kg of butyl acetate, and the mixture is stirred uniformly to prepare the dispersing agent.
(3) 50 kg of titanium dioxide with the particle size of about 300 nanometers and 50 kg of wollastonite with the particle size of 1-10 micrometers are weighed.
(4) 100 kg of dispersing agent is heated to 60 ℃, titanium dioxide and wollastonite which are measured are sequentially and slowly added into the dispersing agent, and stirred by a high-speed stirrer for about 3 hours at about 60 ℃ to prepare white slurry.
(5) The glass cloth and the glass mat are wound on the die covered with the high-temperature polypropylene film by a winding machine for 40 circles, as shown in figure 1.
(6) Heating F-51 bisphenol A epoxy resin at 80 ℃ for 4 hours; weighing 50 kg of F-51 bisphenol A epoxy resin, 35 kg of methyl tetrahydrophthalic anhydride, 15 kg of white slurry and 0.2 kg of N, N-dimethylbenzylamine, and uniformly mixing by using a high-speed mixer to prepare the epoxy resin prepreg.
(7) Pouring the epoxy resin prepreg into VPI equipment, controlling the temperature in the equipment to be about 40 ℃, and putting the mould wound with the glass cloth and the glass felt into vacuum impregnation equipment. The vacuum pressure is controlled to be about 0.07MPa, the dipping times are controlled to be 4 times, and the time is controlled to be about 1.2 hours.
(8) And (3) raising the temperature of the oven to 160 ℃, putting the mould in the step (7) into the oven, curing for 60min at the rotation speed of 20 revolutions per minute and under the condition of 160 +/-5 ℃, then adjusting the temperature of the oven to 150 +/-5 ℃, and continuing to cure for 80 min.
(9) And after the curing is finished, taking the die out of the oven, standing at room temperature for cooling for 30min, and stripping 2-3 layers of the outer surface to make the surface smooth.
(10) Repeating the steps (5) to (7) for multiple times until the thickness of the end ring meets the requirement, and sequentially carrying out cutting, stripping and polishing treatment according to the specified size to process the end ring to the specified size.
Example 2
A preparation method of an epoxy glass cloth reinforced insulation end ring comprises the following steps:
(1) and (3) putting the glass cloth and the glass mat into an oven, and baking for more than 36 hours at the temperature of 70 ℃.
(2) 1kg of Xinyue organic silicon modified epoxy resin ES-1001N is added into a mixture consisting of 50 kg of ethyl acetate and 49 kg of butyl acetate, and the mixture is stirred uniformly to prepare the dispersing agent.
(3) 50 kg of titanium dioxide with the particle size of about 300 nanometers and 50 kg of wollastonite with the particle size of 1-10 micrometers are weighed.
(4) 100 kg of dispersing agent is heated to 60 ℃, the weighed titanium dioxide and wollastonite are sequentially and slowly added into the dispersing agent, and stirred by a high-speed stirrer for about 3 hours at about 60 ℃ to prepare white slurry.
(5) The glass cloth and the glass mat are wound on the die covered with the high-temperature polypropylene film by a winding machine for 40 circles, as shown in figure 1.
(6) Heating hydantoin epoxy resin at 80 ℃ for 4 hours; weighing 45 kg of hydantoin epoxy resin, 45 kg of methylhexahydrophthalic anhydride, 10 kg of white slurry and 0.1 kg of N, N-dimethylbenzylamine, and uniformly mixing by using a high-speed mixer to prepare the epoxy resin prepreg.
(7) Pouring the epoxy resin prepreg into VPI equipment, controlling the temperature in the equipment to be about 40 ℃, and putting the mould wound with the glass cloth and the glass felt into vacuum impregnation equipment. The vacuum pressure is controlled to be about 0.08MPa, the dipping times are controlled to be 4 times, and the time is controlled to be about 1.2 hours.
(8) And (3) raising the temperature of the oven to 160 ℃, putting the mould into the oven, curing for 60min at the rotation speed of 20 revolutions per minute and at the temperature of 170 +/-5 ℃, adjusting the temperature of the oven to 170 +/-5 ℃, and continuously curing for 80 min.
(9) And after the curing is finished, the die is placed in an oven and cooled for 30min at room temperature, and 2-3 layers of the outer surface are peeled off to make the surface smooth.
(10) Repeating the steps (5) to (7) for multiple times until the thickness of the end ring meets the requirement, and sequentially carrying out cutting, stripping and polishing treatment according to the specified size to process the end ring to the specified size.
Example 3
A preparation method of an epoxy glass cloth reinforced insulation end ring comprises the following steps:
(1) and (3) putting the glass cloth and the glass felt into an oven, and baking for more than 48 hours at the temperature of 60 ℃.
(2) 1kg of Xinyue organic silicon modified epoxy resin ES-1001N is added into a mixture consisting of 50 kg of ethyl acetate and 49 kg of butyl acetate, and the mixture is stirred uniformly to prepare the dispersing agent.
(3) 50 kg of titanium dioxide with the particle size of about 300 nanometers and 50 kg of wollastonite with the particle size of 1-10 micrometers are weighed.
(4) 100 kg of dispersing agent is heated to 60 ℃, the weighed titanium dioxide and wollastonite are sequentially and slowly added into the dispersing agent, and stirred by a high-speed stirrer for about 3 hours at about 60 ℃ to prepare white slurry.
(5) The glass cloth and the glass mat are wound on the die covered with the high-temperature polypropylene film by a winding machine for 40 circles, as shown in figure 1.
(6) Heating hydantoin epoxy resin at 80 ℃ for 4 hours; weighing 45 kg of hydantoin epoxy resin, 45 kg of methyl nadic anhydride, 10 kg of white slurry and 0.2 kg of liquid 2-ethyl-4-methylpyridine, and uniformly mixing by using a high-speed mixer to prepare the epoxy resin prepreg.
(7) Pouring the epoxy resin prepreg into VPI equipment, controlling the temperature in the equipment to be about 40 ℃, and putting the mould wound with the glass cloth and the glass felt into vacuum impregnation equipment. The vacuum pressure is controlled to be about 0.07MPa, the dipping times are controlled to be 4 times, and the time is controlled to be about 1.2 hours.
(8) And (3) raising the temperature of the oven to 160 ℃, putting the mould into the oven, maintaining the rotating speed at 20 r/min, curing for 60min at the temperature of 180 +/-5 ℃, adjusting the temperature of the oven to 150 +/-5 ℃, and continuously curing for 80 min.
(9) And after the curing is finished, the die is placed in an oven and cooled for 30min at room temperature, and 2-3 layers of the outer surface are peeled off to make the surface smooth.
(10) Repeating the steps (5) to (7) for multiple times until the thickness of the end ring meets the requirement, and sequentially carrying out cutting, stripping and polishing treatment according to the specified size to process the end ring to the specified size.
And (3) performance testing:
various performance indexes of the epoxy glass cloth reinforced insulating end ring prepared according to the methods of examples 1 to 3 were measured, and the results are shown in table 1 below.
TABLE 1
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (10)
1. The preparation method of the epoxy glass cloth reinforced insulating end ring is characterized by comprising the following steps of:
putting the alkali-free glass cloth and the glass felt into an oven, and baking at 60-80 ℃ for more than 24 hours;
and (II) uniformly mixing an inorganic filler and a dispersing agent in a high-speed mixer according to the mass ratio of 1: 0.8-3 to prepare white slurry, wherein the inorganic filler is titanium dioxide and needle-shaped wollastonite powder according to the mass ratio of 1: 0.5-2 of a mixture;
thirdly, compounding the alkali-free glass cloth and the glass felt into a layer of glass felt according to the mode that the layer of alkali-free glass cloth is compounded into a layer of glass felt, and the bottom layer of the glass felt is compounded into a layer of glass felt, and winding the glass felt on a mold covered with a high-temperature film or a mold coated with a mold release agent by using a cloth winding machine, wherein the number of winding turns is 30-40 turns;
fourthly, mixing the white slurry with epoxy resin, a curing agent and a curing accelerator to prepare epoxy resin prepreg, putting the mould subjected to the third step into vacuum impregnation equipment, and uniformly impregnating the epoxy resin prepreg on alkali-free glass cloth through a vacuum pressure impregnation process;
the preparation process of the epoxy resin prepreg comprises the following steps: putting the epoxy resin into an oven to be baked to reduce the viscosity of the epoxy resin, then mixing 30-50 parts of the epoxy resin, 30-45 parts of a curing agent, 10-25 parts of white slurry and 0.1-0.2 part of a curing accelerator according to parts by weight, and dispersing by using a high-speed stirrer to obtain the epoxy resin prepreg;
the specific process conditions of the vacuum pressure impregnation are as follows: the pressure is 0.06-0.08 MPa, the dipping times are 3-5 times, and the time is 1-1.5 hours;
putting the mold subjected to the step (IV) into an oven, curing at 140-180 ℃, taking out the mold from the oven after curing is finished, cooling, and stripping 2-3 layers of the outer surface to make the surface smooth;
and (VI) repeating the steps from the third step to the fifth step for a plurality of times until the thickness of the end ring meets the requirement.
2. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: in the step (I), the baking temperature is 60-70 ℃, and the baking time is more than 36 hours.
3. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: the alkali-free glass cloth is twistless roving alkali-free glass cloth, the single-layer thickness of the alkali-free glass cloth is 0.1-0.15 mm, and the filament number of the single filament is 40-60 dtex; the glass felt is an alkali-free glass fiber continuous needled felt, the single-layer thickness is 0.1-0.15 mm, and the single-fiber fineness is 20-40 dtex.
4. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: the particle size of the titanium dioxide is 250-350 nanometers, the size of the needle-shaped wollastonite powder is 1-10 micrometers, and the length-diameter ratio is larger than 10.
5. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: in the step (II), the dispersing agent is a mixture of an organic silicon defoaming agent and two or more than two of ethyl acetate, butyl acetate and acetone, wherein the mass content of the organic silicon defoaming agent in the dispersing agent is 0.5-1.5%, and the weight ratio of the inorganic filler to the dispersing agent is 1: 1 to 3.
6. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: the preparation process of the white pulp comprises the following steps: and (3) putting the dispersing agent into a stirring barrel of a high-speed stirrer, starting stirring, heating to 50-70 ℃, then sequentially and slowly adding titanium dioxide and the needle-shaped wollastonite powder, and stirring at a high speed until the dispersing agent is uniformly dispersed to obtain the titanium dioxide-wollastonite powder.
7. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: the high-temperature film is a high-temperature polypropylene film, and the release agent is an organic silicon release agent.
8. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: the epoxy resin is hydantoin epoxy resin or phenolic aldehyde modified bisphenol A epoxy resin; the curing agent is one or two of methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride and methyl nadic anhydride; the curing accelerator is a tertiary amine curing agent or an imidazole curing agent.
9. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: in the step (v), the curing step includes: controlling the rotating speed of the die subjected to the step (IV) in an oven to be 10-20 r/min; the curing time is 1.5 to 2.5 hours.
10. The method of making an epoxy-glass cloth reinforced insulating end ring of claim 1, wherein: and (6) after the step (six) is finished, taking out the mold from the oven, cooling for 50-100 min, and demolding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010381052.3A CN111660588B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010381052.3A CN111660588B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
| CN201711265273.9A CN107972289B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711265273.9A Division CN107972289B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111660588A true CN111660588A (en) | 2020-09-15 |
| CN111660588B CN111660588B (en) | 2022-04-01 |
Family
ID=62009265
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711265273.9A Active CN107972289B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
| CN202010381052.3A Active CN111660588B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711265273.9A Active CN107972289B (en) | 2017-12-05 | 2017-12-05 | Preparation method of epoxy glass cloth reinforced insulation end ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN107972289B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080194741A1 (en) * | 2004-10-08 | 2008-08-14 | Basf Aktiengesellschaft | Flowable Thermoplastic Materials With Halogen-Free Flame Protection |
| CN102254673A (en) * | 2011-01-19 | 2011-11-23 | 江苏宝亨新电气有限公司 | Externally encapsulated insulation structure of transformer coils |
| CN203491069U (en) * | 2013-07-31 | 2014-03-19 | 鲁特电工股份有限公司 | Insulating end ring for resin pouring-type transformer high-voltage coil |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050095415A1 (en) * | 2003-10-30 | 2005-05-05 | Raghavendran Venkat K. | Glass mat thermoplastic composite |
| CN101847505B (en) * | 2010-05-28 | 2012-06-27 | 常州联力变压器有限公司 | Dry type transformer and manufacturing method thereof |
| CN105017723B (en) * | 2015-06-26 | 2017-12-26 | 四川东材科技集团股份有限公司 | A kind of extra-high voltage direct-current power transmission and transformation insulation stressed member and preparation method thereof |
| CN105418054B (en) * | 2015-11-30 | 2018-07-31 | 上海秉丰生物科技有限公司 | A kind of preparation method of special ceramic material |
-
2017
- 2017-12-05 CN CN201711265273.9A patent/CN107972289B/en active Active
- 2017-12-05 CN CN202010381052.3A patent/CN111660588B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080194741A1 (en) * | 2004-10-08 | 2008-08-14 | Basf Aktiengesellschaft | Flowable Thermoplastic Materials With Halogen-Free Flame Protection |
| CN102254673A (en) * | 2011-01-19 | 2011-11-23 | 江苏宝亨新电气有限公司 | Externally encapsulated insulation structure of transformer coils |
| CN203491069U (en) * | 2013-07-31 | 2014-03-19 | 鲁特电工股份有限公司 | Insulating end ring for resin pouring-type transformer high-voltage coil |
Non-Patent Citations (4)
| Title |
|---|
| 周俊等: ""TiO2包覆硅灰石填充对PA1010复合材料的影响"", 《现代塑料加工应用》 * |
| 杨少凤等: ""不同粒度硅灰石的纳米TiO2/硅灰石复合体结构及性能对比"", 《吉林大学自然科学学报》 * |
| 汪多仁: "《绿色纳米化学品》", 31 July 2007, 科学技术文献出版社 * |
| 沈上越等: "《矿物岩石材料工艺学》", 30 September 2005, 中国地质大学出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107972289A (en) | 2018-05-01 |
| CN107972289B (en) | 2020-06-02 |
| CN111660588B (en) | 2022-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107973925B (en) | Preparation method of epoxy glass cloth insulating cylinder | |
| CN100564448C (en) | A kind of method for preparing molded epoxy resin sheet and products thereof | |
| CN101430954B (en) | Production method for composite insulator silicon rubber jacket | |
| CN105538738B (en) | A kind of carbon fibre reinforced pipe manufacturing process and carbon fibre reinforced pipe | |
| CN100556682C (en) | A kind of molded epoxy resin sheet and preparation method thereof | |
| CN105419229B (en) | A kind of hollow combined insulator winding pipe and preparation method thereof | |
| CN106531437B (en) | A kind of preparation method of transformer insulating cylinder | |
| CN111645343A (en) | Corrosion-resistant high-strength glass fiber reinforced plastic storage tank and production method thereof | |
| CN105261497B (en) | A kind of voltage levels insulated tension pole prefabricated component and its preparation process | |
| CN101615455B (en) | Manufacturing method of vacuum glue-dipping insulation pipe without air gaps | |
| CN102371650B (en) | Preparation method for high-strength composite cable holder | |
| CN111169045B (en) | Pultrusion impregnation device, die, equipment and method for wind power blade main beam sheet | |
| CN101740185B (en) | Preparation method of large-diameter composite insulator solid core rod | |
| CN111378244A (en) | Solid buoyancy material and preparation method and application thereof | |
| CN111660588B (en) | Preparation method of epoxy glass cloth reinforced insulation end ring | |
| CN110256848A (en) | A kind of magnetoelectric composites and preparation method thereof | |
| CN109427451B (en) | Composite pipe for insulating operating rod and preparation method thereof | |
| CN109741938B (en) | Method for preparing epoxy PET insulating cylinder suitable for casting dry-type transformer | |
| JP2001500577A (en) | Roll having composite cover and method for producing the same roll using circumferential spatial layer | |
| CN103956210B (en) | Assorted fibre composite rope core, its moulding process and wire rope core manufacture device | |
| CN115157516A (en) | Preparation method of novel carbon fiber insulation board | |
| CN104786408A (en) | Method for preparing epoxy resin for casting dry type transformer | |
| CN109940908A (en) | A kind of moulding process of carbon fiber and phenolic resin composite | |
| CN113002032A (en) | Production process of high-molecular PE composite pipe | |
| CN201875284U (en) | High-strength composite cable bracket |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |