CN116001366A - Glass fiber woven cloth impregnated tube, preparation method thereof and composite insulator - Google Patents
Glass fiber woven cloth impregnated tube, preparation method thereof and composite insulator Download PDFInfo
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- CN116001366A CN116001366A CN202211628085.9A CN202211628085A CN116001366A CN 116001366 A CN116001366 A CN 116001366A CN 202211628085 A CN202211628085 A CN 202211628085A CN 116001366 A CN116001366 A CN 116001366A
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Abstract
The utility model relates to a glass fiber woven cloth impregnated tube, a preparation method thereof and a composite insulator, belonging to the field of manufacturing of high-voltage electrical equipment. The glass fiber woven cloth impregnated tube is made of fiber cloth reinforced resin material and comprises a resin matrix and a fiber cloth reinforcing layer; the fiber cloth reinforcing layer comprises a bottom layer, an intermediate layer and an outer layer, wherein the bottom layer is formed by lapping and winding a polyester fiber woven fabric or a polyester surface felt, the intermediate layer is formed by lapping and winding a glass fiber woven fabric, and the outer layer is formed by lapping and winding a polyester fiber woven fabric or a polyester surface felt; the resin matrix is mainly formed by curing cyanate resin, E51 resin, E44 resin and curing agent. The glass fiber woven cloth impregnated tube is a fiber cloth reinforced resin material formed by impregnating fiber cloth with resin, and interfacial delamination does not occur at high temperature, so that the high temperature resistance and arc resistance are improved, and the polyester fiber cloth is resistant to SF6 gas and decomposition products thereof.
Description
Technical Field
The utility model relates to a glass fiber woven cloth impregnated tube, a preparation method thereof and a composite insulator, belonging to the field of manufacturing of high-voltage electrical equipment.
Background
The hollow composite insulator has a series of excellent electromechanical properties such as light weight, compact structure, pollution flashover resistance, wet flashover resistance, explosion resistance and the like, so that the hollow composite insulator is favored by the power industry relative to the porcelain bushing. With the maturity of composite insulator manufacturing technology and the requirement of external insulation compounding of direct current breaker products, hollow composite insulators are not only used as external insulation of inlet and outlet wires of substation power equipment, but also gradually used in external insulation of arc extinguishing chambers of open switch products. The conventional hollow composite insulator uses a glass fiber winding pipe multipurpose E51 resin as a matrix, wets glass fibers, adopts a wet winding process for molding, and has common high temperature resistance. In the breaking process of the circuit breaker, the arc extinguishing chamber has discrete electric arcs or high-temperature air currents to ablate the inner wall of the hollow composite insulator, so that the material is gradually deteriorated, the insulation and mechanical properties are gradually reduced, and finally, the insulation or mechanical failure of parts can be caused, and at present, a plurality of attempts are made by related manufacturers in the insulator industry in the aspect of improving the arc resistance of the inner wall of the hollow composite insulator.
For example, the Chinese patent with the publication number of CN201181616Y discloses a method for improving the arc resistance of the inner wall of an insulator by adding an epoxy ester insulating paint layer on the inner wall of a hollow composite insulator, but the bonding force between an inner liner layer and a matrix in the practical use process of the method is weak, and the epoxy ester insulating paint layer is easy to peel under the high-temperature condition. The Chinese patent with the publication number of CN210378624U discloses a hollow composite insulator with epoxy resin glass fiber as an inner tube, but the electric arc preventing lining is not specifically and clearly expressed. The Chinese patent application with publication number CN109786047A and Chinese patent with publication number CN209418219U disclose a hollow composite insulator and circuit breaker which adopt polytetrafluoroethylene as lining, the lining is cylindrical, the composite tube made of epoxy resin glass fiber is assembled outside the lining, and a thicker adhesive layer is coated in the gap between the hollow composite insulator and the circuit breaker; the Chinese patent with publication number CN206672726U discloses a composite insulator made by winding epoxy resin glass fiber layer on the outer surface of polytetrafluoroethylene hollow tube. The polytetrafluoroethylene tube is adopted as the lining, but the manufacturing process is complex, the cost is high, the thermal expansion coefficients of the polytetrafluoroethylene, epoxy resin glass fiber winding tube and the adhesive layer are different, the interface layering among the polytetrafluoroethylene, the epoxy resin glass fiber winding tube and the adhesive layer is easy to cause under the high temperature condition, and the breakdown is caused along two interfaces among the polytetrafluoroethylene, the epoxy resin glass fiber winding tube and the adhesive layer under the high voltage condition, so that hidden danger is brought to the safe and reliable operation of the switch equipment.
Disclosure of Invention
The utility model aims to provide a glass fiber woven cloth impregnated tube which solves the problems of poor temperature resistance, poor insulating property and poor mechanical property at high temperature in the prior art.
The second purpose of the utility model is to provide a preparation method of the glass fiber woven cloth impregnated tube, which solves the problem of complex manufacturing process in the prior art.
The third purpose of the utility model is to provide a composite insulator, which solves the problems of poor arc resistance and easy delamination of interfaces at high temperature in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the glass fiber woven cloth dipping tube of the utility model is as follows:
the glass fiber woven cloth impregnated tube is made of fiber cloth reinforced resin material and comprises a resin matrix and a fiber cloth reinforcing layer; the fiber cloth reinforcing layer comprises a bottom layer, an intermediate layer and an outer layer, wherein the bottom layer is formed by lapping and winding a polyester fiber woven fabric or a polyester surface felt, the intermediate layer is formed by lapping and winding a glass fiber woven fabric, and the outer layer is formed by lapping and winding a polyester fiber woven fabric or a polyester surface felt; the resin matrix is mainly formed by curing cyanate resin, E51 resin, E44 resin and curing agent.
The glass fiber woven cloth impregnated tube is formed by coating the fiber cloth with the resin to form the fiber cloth reinforced resin material, so that the impregnated tube has no obvious interface layer, and no interface layering occurs at high temperature, thereby improving the high temperature resistance and arc resistance of the impregnated tube, and the SF6 gas resistance and the decomposition products of the polyester fiber cloth.
Further preferably, the glass fiber woven cloth is a glass fiber woven cloth, and the fiber direction of the glass fiber woven cloth is one or more of the combination of the monoaxial direction, the biaxial direction, the triaxial direction and the tetraaxial direction.
Preferably, the mass fraction of the resin matrix in the glass fiber woven cloth impregnated tube is 60-80%.
Preferably, the thickness ratio of the bottom layer, the middle layer and the outer layer of the fiber cloth reinforced layer is (1-2): (8.4-14): (1-2).
Preferably, the number of winding layers of the bottom layer is 2-4.
Preferably, the number of winding layers of the outer layer is 2-4.
Further preferably, the mass ratio of the cyanate resin, the E51 resin, the E44 resin and the curing agent is (50 to 60): (100-110): 10-15): 80-85.
The preparation method of the glass fiber woven cloth impregnated tube adopts the following technical scheme:
a preparation method of a glass fiber woven cloth impregnated tube comprises the following steps:
(1) Pre-baking the mold core and the mold sleeve;
(2) Sequentially rolling a prefabricated bottom layer, an intermediate layer and an outer layer on the pre-baked mold core;
(3) Placing the coiled prefabricated mold core into a mold sleeve cavity after pre-baking, and assembling a mold to perform continuous pre-baking;
(4) Mixing cyanate resin, E51 resin, E44 resin and curing agent, and vacuumizing to obtain resin sizing material;
(5) Vacuumizing the pre-baked mold, injecting the resin sizing material obtained in the step (4) into the mold cavity, and solidifying, cooling and demolding to obtain the glass fiber woven cloth impregnated tube.
According to the preparation method of the glass fiber woven cloth impregnated tube, the prefabricated polyester fiber woven cloth and/or the surface felt, the glass fiber woven cloth and the polyester fiber woven cloth and/or the surface felt are sequentially rolled to serve as the reinforcing layer, the resin sizing material is impregnated and fixed on the reinforcing layer by adopting a vacuum impregnation process, and the glass fiber reinforced impregnated tube is formed.
Preferably, the rolls are prefabricated in lap joint form.
In order to make the mixing of the substances more uniform, preferably, the mixing in step (4) is a stepwise stirring mixing; the sectional stirring is divided into two sections, wherein the first section stirring speed is 10-15 r/min, and the second section stirring speed is 30-40 r/min.
Preferably, the period of stirring is 0.5-1 h; the two-stage stirring time is 0.2-0.5 h.
In order to improve the curing efficiency, preferably, the curing temperature in the step (5) is 60-130 ℃; the curing time is 10-21 h.
Further preferably, the curing is a multi-stage curing.
Further preferably, the multi-stage curing is four-stage curing, wherein the temperature of the first stage is 60-70 ℃, the temperature of the second stage is 80-100 ℃, the temperature of the third stage is 110-120 ℃, and the temperature of the fourth stage is 120-130 ℃.
Further preferably, the rate of temperature rise between the stages is 1 ℃/min.
Further preferably, the first stage of curing takes 1 to 3 hours, the second stage of curing takes 1 to 3 hours, the third stage of curing takes 5 to 10 hours, and the fourth stage of curing takes 3 to 5 hours.
Preferably, the resin sizing material obtained in the step (4) is injected into the die cavity in the step (5), and the injection speed is 150-300 g/min.
It is further preferred that the injection of the resin compound is stopped when the resin compound appears at the riser at the other end of the mold.
Preferably, the temperature of the pre-baking in the step (1) and the step (3) is 100-120 ℃.
Further preferably, the pre-baking time in the step (1) is 1-3 hours; and (3) continuously pre-baking for 2-4 hours.
The technical scheme adopted by the composite insulator is as follows:
a composite insulator comprises the glass fiber woven cloth vacuum dipping tube, an insulating umbrella cover arranged on the periphery of the dipping tube and connecting pieces arranged at two ends of the dipping tube.
The composite insulator of the utility model utilizes the high temperature resistance of the cyanate resin material, improves the high temperature resistance and arc burning resistance of the inner wall of the insulating tube, and the resin and the base material are uniformly distributed, and the expansion of each part tends to be consistent under the high temperature condition, so that the layering defect is not easy to generate.
Drawings
FIG. 1 shows a glass fiber woven cloth impregnated tube according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a composite insulator according to an embodiment of the present utility model;
wherein 1 is a glass fiber woven cloth impregnated tube, 2 is an umbrella skirt sheath, and 3 is a connecting accessory.
Detailed Description
The technical scheme of the utility model is further described below with reference to the specific embodiments.
1. The specific embodiment of the glass fiber woven cloth impregnated tube and the preparation method thereof are as follows:
example 1
The preparation method of the glass fiber woven cloth impregnated tube of the embodiment comprises the following steps:
(1) Mold pretreatment
a. Cleaning a mold core and a mold sleeve cavity of the glass fiber woven cloth vacuum impregnated tube by using a scraping plate, fuzzless paper, alcohol and the like, removing impurities such as grease, foreign matters and the like, and uniformly coating a release agent on the surfaces of the mold core and the mold sleeve cavity;
b. and (3) putting the mold core and the mold sleeve into an oven for pre-baking at the temperature of about 100 ℃ for 3 hours.
(2) Glass fiber woven cloth roll prefabrication
a. The glass fiber warp-knitted fabric is adopted as the glass fiber warp-knitted fabric, and the fiber direction is biaxial;
b. taking out the pre-baked mold core from the oven, and firstly winding 2 layers of SF6 gas-resistant polyester fiber woven cloth or surface felt of a decomposition product thereof on the mold core; then, the glass fiber warp-knitted fabric is layered and wound in a lap joint mode, and the final thickness is 10mm; continuously winding the polyester surface felt 2 layers in a lap joint mode; after the rolling is finished, the glass fiber yarn is utilized to tie up the cloth roll in sections to prevent the cloth roll from loosening;
c. and (3) placing the prefabricated cloth roll into a die sleeve cavity, assembling a die, and then placing into an oven for pre-baking at the temperature of about 100 ℃ for 4 hours.
(3) Preparation of glass fiber woven cloth vacuum impregnated tube
a. The high-temperature resistant resin sizing material consists of cyanate ester resin (BADCy), E51 resin, E44 resin, curing agent HY918 and accelerator DF-602, and is fully stirred and mixed in stages and vacuum deaerated in a mixing tank at 50 ℃ according to the mass ratio of 60:100:10:80:0.2; wherein, the stirring speed of one section is 10r/min, and the stirring time is 1h; the second-stage stirring speed is 30r/min, vacuum degassing is started at the same time, and when the vacuum degree is less than 100Pa, stirring is continued for 0.5h and stopped;
b. taking out the mold from the oven, connecting the mold to a glue injection system, and vacuumizing the mold for more than 0.5h until the vacuum degree is stable;
c. opening a dry compressed gas valve, pressing into a mixing tank, and controlling the pressure to be 0.02MPa; the compressed gas is dry compressed air;
d. opening a glue injection valve, injecting glue into the die cavity at the glue injection speed of 150g/min, and stopping injecting the glue when the glue solution appears at the riser at the other end of the die;
e. putting the mold after the glue injection is completed into an oven for curing; the multi-stage curing process is adopted: one section of the temperature is 60 ℃, the time is 3h, the second section of the temperature is 80 ℃, the time is 3h, the third section of the temperature is 110 ℃, the time is 10h, the fourth section of the temperature is 120 ℃, the time is 5h, and the temperature rising speed between the sections is 1 ℃/min;
f. and after solidification, closing the oven, cooling to 40-60 ℃ along with the oven, taking out the mold, demolding, then placing to room temperature, and carrying out machining treatment according to the size requirement of the impregnated tube.
The structure of the glass fiber woven cloth impregnated tube prepared by the method of the embodiment is as follows: the fiber cloth comprises a bottom layer of lap joint material polyester fiber woven cloth or surface felt, a middle layer of lap joint material glass fiber woven cloth and an outer layer of lap joint material polyester fiber woven cloth or surface felt. The corresponding parameters can be determined by the parameters corresponding to the preparation method of example 1.
Example 2
The preparation method of the glass fiber woven cloth impregnated tube of the embodiment comprises the following steps:
(1) Mold pretreatment
a. Cleaning a mold core and a mold sleeve cavity of the glass fiber woven cloth vacuum impregnated tube by using a scraping plate, fuzzless paper, alcohol and the like, removing impurities such as grease, foreign matters and the like, and uniformly coating a release agent on the surfaces of the mold core and the mold sleeve cavity;
b. and (3) putting the mold core and the mold sleeve into an oven for pre-baking at about 120 ℃ for 1h.
(2) Glass fiber woven cloth roll prefabrication
a. The glass fiber warp-knitted fabric is adopted as the glass fiber warp-knitted fabric, and the fiber direction is triaxial;
b. taking out the pre-baked mold core from the oven, and firstly winding 4 layers of SF6 gas-resistant polyester fiber woven cloth or surface felt of a decomposition product thereof on the mold core; then, layering and winding the glass fiber warp-knitted fabric in a lap joint mode, wherein the final thickness is 14mm; continuously winding the polyester surface felt 4 layers in a lap joint mode; after the rolling is finished, the glass fiber yarn is utilized to tie up the cloth roll in sections to prevent the cloth roll from loosening;
c. and (3) placing the prefabricated cloth roll into a die sleeve cavity, assembling a die, and then placing into an oven for pre-baking at about 120 ℃ for 2 hours.
(3) Preparation of glass fiber woven cloth vacuum impregnated tube
a. The high-temperature resistant resin sizing material consists of cyanate ester resin (BADCy), E51 resin, E44 resin, curing agent HY918 and accelerator DF-602, and is fully stirred and mixed in stages and vacuum deaerated in a mixing tank at 60 ℃ according to the mass ratio of 60:100:10:80:0.2; wherein, the stirring speed of one section is 15r/min, and the stirring time is 0.5h; the second-stage stirring speed is 40r/min, vacuum degassing is started at the same time, and when the vacuum degree is less than 100Pa, stirring is continued for 0.2h and stopped;
b. taking out the mold from the oven, connecting the mold to a glue injection system, and vacuumizing the mold for more than 0.5h until the vacuum degree is stable;
c. opening a dry compressed gas valve, pressing into a mixing tank, and controlling the pressure to be 0.04MPa; the compressed gas is nitrogen;
d. opening a glue injection valve, injecting glue into the die cavity at the glue injection speed of 300g/min, and stopping injecting the glue when the glue solution appears at the riser at the other end of the die;
e. putting the mold after the glue injection is completed into an oven for curing; the multi-stage curing process is adopted: the temperature of the first section is 70 ℃, the time is 1h, the temperature of the second section is 100 ℃, the time is 1h, the temperature of the third section is 120 ℃, the time is 5h, the temperature of the fourth section is 130 ℃, the time is 3h, and the temperature rising speed between the sections is 1 ℃/min;
f. and after solidification, closing the oven, cooling to 40-60 ℃ along with the oven, taking out the mold, demolding, then placing to room temperature, and carrying out machining treatment according to the size requirement of the impregnated tube.
In other embodiments, the fiber direction of the glass fiber woven cloth may also be monoaxial or tetraaxial.
The structure of the glass fiber woven cloth impregnated tube prepared by the method of the embodiment is as follows: the fiber cloth comprises a bottom layer of lap joint material polyester fiber woven cloth or surface felt, a middle layer of lap joint material glass fiber woven cloth and an outer layer of lap joint material polyester fiber woven cloth or surface felt. The corresponding parameters can be determined by the parameters corresponding to the preparation method of example 1.
Example 3
The preparation method of the glass fiber woven cloth impregnated tube of this example was prepared by referring to the method of example 1.
The structure of the glass fiber woven cloth impregnated tube prepared by the method of the embodiment is as follows: the fiber cloth comprises a bottom layer of lap joint material polyester fiber woven cloth or surface felt, a middle layer of lap joint material glass fiber woven cloth and an outer layer of lap joint material polyester fiber woven cloth or surface felt. The resin sizing material comprises 70% of cyanate resin (BADCy), 70% of E51 resin, 70% of E44 resin, 80:0.2 of curing agent HY918 and 70% of accelerator DF-602 in the glass fiber woven fabric impregnated tube, and the mass ratio of the cyanate resin to the E51 resin to the E44 resin to the curing agent to the accelerator is 50:100:10:80:0.2. The polyester fiber woven cloth of the inner layer and the polyester fiber woven cloth or the surface felt of the outer layer are respectively lapped with 4 layers, namely, the thickness is 2mm, the glass fiber woven cloth of the middle layer is lapped with 21 layers, and the thickness is 8.4mm. The results are shown in FIG. 1.
2. The specific embodiment of the composite insulator of the utility model is as follows:
example 4
The composite insulator of the embodiment is prepared by the following steps: the outer surface layer of the glass fiber woven cloth vacuum immersed tube 1 prepared in the embodiment 3 is molded with a silicone rubber umbrella skirt sheath 2 by adopting an injection molding process, and then two ends of the glass fiber woven cloth vacuum immersed tube are glued with connecting accessories 3, and the result is shown in figure 2.
3. Experimental example arc resistance comparison
On an arc resistance tester, arc resistance performance is detected according to the test method of national standard GB/T1141-2002 'test of high voltage resistance and small current arc discharge of dry solid insulating materials', and the test results are as follows:
TABLE 1
| Product(s) | Conventional products | Example 1 | Example 2 | Example 3 |
| Time s | 210 | 368 | 394 | 316 |
The conventional product is a composite insulator made by winding an epoxy resin glass fiber layer on the outer surface of a polytetrafluoroethylene hollow tube. As can be seen from Table 1, compared with the conventional product, the glass fiber woven cloth impregnated tube prepared by the utility model has longer arc resistance time and better arc resistance.
Claims (9)
1. The glass fiber woven cloth impregnated tube is characterized by being made of fiber cloth reinforced resin material and comprising a resin matrix and a fiber cloth reinforcing layer; the fiber cloth reinforcing layer comprises a bottom layer, an intermediate layer and an outer layer, wherein the bottom layer is formed by lapping and winding a polyester fiber woven fabric or a polyester surface felt, the intermediate layer is formed by lapping and winding a glass fiber woven fabric, and the outer layer is formed by lapping and winding a polyester fiber woven fabric or a polyester surface felt; the resin matrix is mainly formed by curing cyanate resin, E51 resin, E44 resin and curing agent.
2. The glass fiber woven cloth impregnated tube according to claim 1, wherein the mass fraction of the resin matrix in the glass fiber woven cloth impregnated tube is 60-80%.
3. The glass fiber woven cloth impregnated tube according to claim 1, wherein the thickness ratio of the bottom layer, the middle layer and the outer layer of the fiber woven cloth reinforcing layer is (1-2): (8.4-14): (1-2).
4. A glass fiber woven cloth impregnated tube according to claim 3, wherein the number of winding layers of the bottom layer is 2-4.
5. A glass fiber woven cloth impregnated tube according to claim 3, wherein the number of winding layers of the outer layer is 2-4.
6. A method for preparing the glass fiber woven cloth impregnated tube according to claim 1, comprising the following steps:
(1) Pre-baking the mold core and the mold sleeve;
(2) Sequentially rolling a prefabricated bottom layer, an intermediate layer and an outer layer on the pre-baked mold core;
(3) Placing the coiled prefabricated mold core into a mold sleeve cavity after pre-baking, and assembling a mold to perform continuous pre-baking;
(4) Mixing cyanate resin, E51 resin, E44 resin and curing agent, and vacuumizing to obtain resin sizing material;
(5) Vacuumizing the pre-baked mold, injecting the resin sizing material obtained in the step (4) into the mold cavity, and solidifying, cooling and demolding to obtain the glass fiber woven cloth impregnated tube.
7. The method for producing a dipped fiber glass woven cloth hose according to claim 6, characterized in that the curing temperature in the step (5) is 60 to 130 ℃; the curing time is 10-21 h.
8. The method for preparing a glass fiber woven cloth impregnated tube according to claim 6, wherein the pre-baking temperature in step (1) and step (3) is 100-120 ℃.
9. A composite insulator, comprising the glass fiber woven cloth impregnated tube according to any one of claims 1 to 5, an insulating umbrella cover arranged on the periphery of the impregnated tube, and connecting pieces arranged at both ends of the impregnated tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211628085.9A CN116001366A (en) | 2022-12-16 | 2022-12-16 | Glass fiber woven cloth impregnated tube, preparation method thereof and composite insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211628085.9A CN116001366A (en) | 2022-12-16 | 2022-12-16 | Glass fiber woven cloth impregnated tube, preparation method thereof and composite insulator |
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| Publication Number | Publication Date |
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| CN116001366A true CN116001366A (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211628085.9A Pending CN116001366A (en) | 2022-12-16 | 2022-12-16 | Glass fiber woven cloth impregnated tube, preparation method thereof and composite insulator |
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| CN (1) | CN116001366A (en) |
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- 2022-12-16 CN CN202211628085.9A patent/CN116001366A/en active Pending
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