CN105419229B - A kind of hollow combined insulator winding pipe and preparation method thereof - Google Patents

Abstract

The invention discloses a winding tube for hollow composite insulators and a preparation method thereof. The winding tube is formed by winding and curing glass fibers impregnated with epoxy resin glue, and the epoxy resin glue is composed of the following raw materials in parts by weight: 80-120 parts of epoxy resin, 50-80 parts of curing agent, 5-10 parts of diluent, 2-5 parts of accelerator, 0.1-0.5 parts of defoamer; the diluent is propylene oxide butyl ether; the The glue content of the winding pipe is 25%-30%. In the winding tube for hollow composite insulators of the present invention, the epoxy resin glue has suitable viscosity and fluidity, and has good bonding performance with glass fibers. After the glass fibers are dipped in glue, it is easy to glue and form fiber yarn sheets, which improves the winding efficiency; After the epoxy resin is cured, the winding tube formed with the glass fiber has high strength, good compactness and air tightness, and has good insulation performance; the glue content is moderate, and it has good mechanical properties and electrical breakdown resistance.

Description

Winding tube for hollow composite insulator and preparation method thereof

technical field

The invention belongs to the technical field of electrical equipment, and in particular relates to a winding pipe for a hollow composite insulator and a preparation method thereof.

Background technique

Insulators are one of the key components in high-voltage power grids and transmission lines, and their performance will directly affect the safe operation of high-voltage power grids. There are three types of high voltage insulators currently used: porcelain insulators, glass insulators and composite insulators. Among them, compared with porcelain insulators and glass insulators, composite insulators have the following advantages: light weight, good shock resistance, strong anti-pollution ability, excellent explosion-proof performance, long service life, good hydrophobicity, wide application range, low maintenance costs, production Low cost, short product delivery time, no zero value, and strong UV resistance, therefore, composite insulators have been welcomed by users since they were put on the market and have developed rapidly.

The composite insulator is composed of three parts: mandrel, umbrella group and hardware. The mandrel is made of high-strength FRP (glass fiber reinforced resin), which is both a load-bearing part and an inner insulator. Composite insulators can be divided into two types: solid and hollow according to the difference of FRP core rods. Solid FRP core rods are generally produced by drawing method and are mainly used in high-voltage overhead lines; hollow FRP core rods are generally formed by winding method and are mainly used in stations. Insulators, such as transformers, high voltage switches and circuit breakers, are called hollow composite insulators. Compared with traditional porcelain insulators and glass insulators, hollow composite insulators have the advantages of light weight, strong pollution flashover resistance, simple manufacturing process, etc., and have developed rapidly in recent decades. As the core part of the hollow composite insulator, the hollow FRP mandrel bears the main mechanical stress and electrical stress. Therefore, for the mandrel for the hollow composite insulator, it is required to have good mechanical properties and electrical breakdown resistance.

At present, there are two types of methods for making hollow composite insulating pipe mandrels: glass fiber wet winding molding, and vacuum impregnated glass cloth tape winding molding. Among them, glass fiber wet winding molding has low cost and is easy to operate, but the winding pipe prepared by it cannot meet the requirements for mechanical properties and electrical breakdown resistance in use.

In the prior art, CN100354988C discloses a method for preparing a resin-based wound composite insulator mandrel impregnated with glass fiber, which includes weighing the resin-based impregnating composition by weight ratio, including resin, curing agent, and accelerator. The weight ratio is 90-120:80-90:1, the resin is epoxy resin, the curing agent is methyl tetrahydrophthalic anhydride, and the accelerator is S-440; one end of the spindle is passed through the resin-based glue tank Put the monofilament of glass fiber epoxy winding yarn into the melted resin-based solution, and then fix one end of the monofilament on the metal ring; turn on the winding machine and work according to the preset program. After winding, together with the winding tooling Put them together in a curing furnace for curing; then wait until the temperature automatically drops to room temperature, then remove the tooling and demould, and the whole process is completed. The winding composite insulator mandrel has simple structure and low production cost. However, it adopts the form of monofilament winding during winding, the production time of unit product is too long, and the production efficiency is low; monofilament is easy to produce the problem of broken yarn, which affects the yield and mechanical strength of the final product; at the same time, monofilament The amount of glue in the dipping is not easy to control, often the amount of glue is low, resulting in an increase in the fiber void ratio in the final product, and the air tightness, anti-aging performance and mechanical strength of the product cannot meet the requirements of use, and it also affects its quality. Resistance to electrical breakdown.

Contents of the invention

The object of the present invention is to provide a winding tube for hollow composite insulators, which has good mechanical properties and electrical breakdown resistance.

Another object of the present invention is to provide a method for preparing wound pipes for hollow composite insulators.

In order to achieve the above object, the technical solution adopted in the present invention is:

A winding tube for hollow composite insulators, the winding tube is formed by winding and curing glass fibers impregnated with epoxy resin glue, and the epoxy resin glue is composed of the following raw materials in parts by weight: 80-120 parts of epoxy resin, 50-80 parts of curing agent, 5-10 parts of diluent, 2-5 parts of accelerator, 0.1-0.5 parts of defoamer; the diluent is propylene oxide butyl ether; the glue content of the winding tube is 25% to 30%.

The glue content refers to the mass percentage of the epoxy resin glue in the whole winding tube after curing (the quality of the epoxy resin glue will not change greatly before and after curing). The glue content (after curing) of the winding pipe of the present invention is 25% to 30%; the balance is glass fiber.

The epoxy resin is E51 type epoxy resin. Preferably, the epoxy resin is EP CYD-128 epoxy resin provided by Sinopec Baling Petrochemical.

The glass fiber is non-alkali glass fiber non-twisted yarn. Preferably, the glass fiber is an alkali-free glass fiber roving.

The curing agent is methyl tetrahydrophthalic anhydride. The gelling temperature of the curing agent is 120-140°C, and the post-curing temperature is 140-160°C. Preferably, the curing agent is JHY906 curing agent (methyltetrahydrophthalic anhydride) provided by Jiaxing Lianxing New Chemical Materials Co., Ltd.

The diluent is reactive diluent 660 (commercially available).

The accelerator is 2,4,6-tris(dimethylaminomethyl)phenol. The accelerator is DMP-30 (commercially available).

The defoamer is a silicone defoamer. The defoamer is preferably BYK A530 defoamer.

The epoxy resin glue is made by mixing the epoxy resin, curing agent, diluent, accelerator and defoamer in the formula quantity; the viscosity of the epoxy resin glue is 0.35～0.45Pa·s (immersion Control the viscosity when gluing). The winding pipe is formed by winding and curing a fiber yarn sheet formed by a plurality of strands of glass fibers impregnated with epoxy resin glue.

The winding pipe for hollow composite insulators of the present invention is formed by winding and curing glass fibers impregnated with epoxy resin glue, and the epoxy resin glue is compounded by adding diluent and defoamer on the basis of epoxy resin, curing agent and accelerator , with suitable viscosity and fluidity, and good bonding performance with glass fiber. After dipping multi-strand glass fiber, it is easy to hang glue and form fiber yarn sheet. After curing, the winding tube formed with glass fiber has high strength, compactness and air tightness. Good, and has good insulation performance; the rubber content of the winding pipe is moderate, has good mechanical properties and electrical breakdown resistance, and meets the requirements for the use of winding pipes for hollow composite insulators in power grids and substations.

A method for preparing the above-mentioned wound pipe for hollow composite insulators, comprising the following steps:

1) Glue compounding: Mix the epoxy resin, curing agent, diluent, accelerator and defoamer evenly to make epoxy resin glue, and put the epoxy resin glue into the constant temperature glue tank;

2) Mold treatment: take the mandrel, and apply a release agent on the mandrel surface;

3) Glue-dipped winding: pass multiple strands of glass fiber untwisted yarn through the glue tank to dip the fiber and form a fiber yarn sheet, and after the fiber yarn sheet is drawn out and fixed at the end of the mandrel, the fiber yarn sheet is continuously wound on the mandrel , the winding angle is 52°～56°, the winding tension is 1.1～2kN, and the winding speed is 1.0～1.5m/s; after winding, wrap a layer of film protection tape on the outside to get a semi-finished product;

4) Curing: The semi-finished product obtained in step 3) is cured and demolded to obtain the product.

In step 1), the temperature of the glue tank is 60°C. The viscosity of the epoxy resin glue is controlled at 0.35-0.45 Pa·s.

In step 1), the epoxy resin glue is preheated before being put into the glue tank; the preheating refers to preheating the epoxy resin glue at 50° C. for 8 hours.

In step 2), the release agent is 818 liquid release agent from AXEL Corporation of the United States. The coating method of the release agent is to spray or dip a soft cloth in the release agent, and wipe the surface of the mandrel to coat evenly.

In step 3), the glass fiber untwisted yarn is dried before use; the drying treatment is at 60-80° C. for 24 hours. The surface of the glass fiber contains moisture, which not only affects the bonding performance between the resin substrate and the glass fiber, but also causes stress corrosion and further expands defects such as microcracks, thereby causing a decrease in the strength and aging resistance of the product. Tumble dry before use.

In the winding process of step 3), the surface of the mandrel is covered with fiber yarn sheets to form a layer of fiber layer, which is wound layer by layer from the inside to the outside; the number of winding layers is set according to the required thickness.

During the winding process in step 3), the distance H between the yarn nozzle and the surface of the mandrel is set at 40-60 mm; the number of yarn clusters is set at 14-20 clusters. The width of the fiber yarn sheet is set according to the number of yarn packages.

In step 3), 9-12 strands of glass fiber untwisted yarns are passed through the glue tank to impregnate the fibers and form fiber yarn sheets with a width of 14-20 mm.

In step 3), the mandrel is covered with fiber yarn sheets as a fiber layer, the winding angle of the inner fiber layer is 52°-56°, and the winding angle of the outermost two fiber layers is 90°. During the winding process, the stop angle of the head is 120°.

During the winding process, the winding parameters need to be controlled: the winding tension depends on the structure of the mandrel, the strength of the reinforced fiber, the viscosity of the glue, and whether the mandrel is heated. The winding tension of the present invention is 1.1-2kN. The preparation method of the winding tube for hollow composite insulators of the present invention is wet winding, and the winding speed (yarn output speed) is limited by the fiber dipping process, which is 1.0-1.5m/s; when the winding speed (yarn output speed) is too fast When the mandrel rotates at a high speed, the imagination of the resin glue migrating and splashing outward from the winding structure under the action of centrifugal force will appear. The distribution and content of the glue in the product cannot be controlled, which will affect the performance of the final product.

During the winding process, pay attention to controlling the glue content and whether there is any yarn breakage in the yarn out of the creel.

The level of glass fiber dipping glue content and its steps have a great influence on the performance of the product, directly affecting the heavyweight thickness of the product; if the glue content is too high, the composite strength of the product will decrease; if the glue content is too low, the fiber void ratio in the product will decrease. Increase, the air tightness, anti-aging performance and shear strength of the product will decrease, and it will also affect the performance of fiber strength. Therefore, the fiber dipping process must be strictly controlled so that the glue content of the resulting wound pipe is 25% to 30% (mass percentage). The fiber glue content is controlled during the fiber dipping process. The dipping process is that the resin glue is coated or impregnated on the surface of the reinforcing fiber, and then the glue diffuses and penetrates into the inside of the reinforcing fiber. These two stages are carried out simultaneously. During the dipping process, there are many factors that affect the glue content of fibers, such as fiber specifications, glue viscosity, winding tension, winding speed, scraping mechanism, operating temperature, etc. Among them, glue viscosity, winding tension, and winding speed are the most important.

The film protection tape is a polyester film or a polytetrafluoroethylene film. The role of wrapping a layer of film protection tape on the outermost side is to prevent uncured resin from dripping.

The curing process is an important condition to ensure that the winding products are fully cured, which directly affects the performance and quality of the winding products. Heating and curing can increase the chemical reaction speed, shorten the curing time, shorten the production cycle and improve production efficiency. The strength of the winding product cured by heating can be increased by at least 20% to 30% compared with that cured at room temperature.

In step 4), the curing is staged curing, and the staged curing means that the semi-finished product is kept at 90°C for 90 minutes, at 120°C for 150 minutes, and at 160°C for 30 minutes.

The preparation method of winding pipe for hollow composite insulators of the present invention includes the steps of compounding glue, mold treatment, dipping winding and curing, and demoulding. Glue and form a fiber yarn sheet, and continuously wind the fiber yarn sheet on the mandrel. Compared with monofilament winding, the production cycle of a single product is greatly shortened, and the production efficiency is high; the winding speed is controlled within an appropriate range to prevent the mandrel from Too high a rotating speed causes the glue to migrate outwards and sprinkling. At the same time, there is almost no yarn breakage, and the yield is high; through reasonable control of the operation and technical parameters of each step, the resulting product has a moderate glue content and good compactness. The composite strength is high, which improves the airtightness, anti-aging performance, electrical breakdown resistance and mechanical strength of the product, meets the requirements of power grids and substations for winding tubes for hollow composite insulators, and has good economic benefits; the preparation method The process is simple, the operation is convenient, stable and reliable, easy for automatic control, and suitable for large-scale industrial production.

Description of drawings

Fig. 1 is a schematic diagram of the process flow of the preparation method of the wound pipe for hollow composite insulators in Example 1.

Detailed ways

The present invention will be further described below in combination with specific embodiments.

In a specific embodiment, the epoxy resin is EP CYD-128 epoxy resin provided by Sinopec Baling Petrochemical; methyltetrahydrophthalic anhydride is provided by Jiaxing Lianxing New Chemical Materials Co., Ltd.; Liquid release agent.

Example 1

The winding tube for hollow composite insulators in this embodiment is formed by winding and curing glass fibers impregnated with epoxy resin glue. The epoxy resin glue is composed of the following raw materials in parts by weight: 80 parts of epoxy resin, methyl tetra 65 parts of hydrophthalic anhydride, 10 parts of propylene oxide butyl ether, 3 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 0.5 part of BYK A530 defoamer; the glue content of the winding tube is 25 % (mass percentage). The glass fiber is non-alkali glass fiber non-twisted yarn.

The manufacturing method of the wound pipe for the hollow composite insulator of this embodiment, the process flow is shown in Figure 1, including the following steps:

1) Glue compounding: Mix E51 type epoxy resin, methyl tetrahydrophthalic anhydride, propylene oxide butyl ether, 2,4,6-tris(dimethylaminomethyl)phenol and BYK A530 defoamer in the formula amount Prepare epoxy resin glue evenly, heat and preheat the epoxy resin glue at 50°C for 8 hours, and then put it into a glue tank with a constant temperature of 60°C; the viscosity of the epoxy resin glue is controlled at 0.35Pa·s ;

2) Mold treatment: take the mandrel, and apply a release agent on the mandrel surface;

3) Dipping and winding: select 12 balls of non-alkali glass fiber roving, and dry the non-alkali glass fiber roving at 60°C for 24 hours before use;

Lead out 12 strands of non-alkali glass fiber rovings from the fiber frame to pass through the glue tank to impregnate the fibers and form a fiber yarn sheet with a width of 20mm. The fiber yarn sheet is wound 3 times at the end of the mandrel and fixed; The distance H of the mold surface is set to 60mm;

Turn on the winding device and continuously wind the fiber yarn on the mandrel to ensure that the fiber covers the surface of the mold. The winding tension is 2kN and the winding speed is 1.0m/s; Winding layer by layer from the inside to the outside, the winding angle of the inner fiber layer is 54°, the winding angle of the outermost two fiber layers is 90°, and the stop angle of the head is 120°; during the winding process, pay attention to scraping and controlling the glue content;

After winding, wrap a layer of polyester film protection tape on the outside to prevent the uncured glue from dripping and get a semi-finished product;

4) Curing: The semi-finished product obtained in step 3) is placed in a curing furnace for stage-by-stage curing. The stage-by-stage curing means that the semi-finished product is kept at 90°C for 90 minutes, at 120°C for 150 minutes, and at 160°C. Keep warm for 30 minutes, then cool down;

After cooling, use a demoulding machine to demould, that is to say.

Example 2

The winding pipe for hollow composite insulators in this embodiment is formed by winding and curing glass fibers impregnated with epoxy resin glue, and the epoxy resin glue is composed of the following raw materials in parts by weight: 100 parts of epoxy resin, methyl tetra 80 parts of hydrophthalic anhydride, 5 parts of propylene oxide butyl ether, 2 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 0.3 parts of BYK A530 defoamer: the glue content of the winding tube is 27 % (mass percentage). The glass fiber is an alkali-free glass fiber roving.

The preparation method of the wound pipe for the hollow composite insulator of this embodiment, the process flow chart is the same as that of Embodiment 1, including the following steps:

1) Glue compounding: Mix E51 type epoxy resin, methyl tetrahydrophthalic anhydride, propylene oxide butyl ether, 2,4,6-tris(dimethylaminomethyl)phenol and BYK A530 defoamer in the formula amount Prepare epoxy resin glue evenly, heat and preheat the epoxy resin glue at 50°C for 8 hours, and then put it into a glue tank with a constant temperature of 60°C; the viscosity of the epoxy resin glue is controlled at 0.40Pa·s ;

2) Mold treatment: take the mandrel, and apply a release agent on the mandrel surface;

3) Dipping and winding: select 10 balls of non-alkali glass fiber roving, and dry the non-alkali glass fiber roving at 70°C for 24 hours before use;

Lead out 10 strands of non-alkali glass fiber roving from the fiber rack to pass through the glue tank to impregnate the fiber and form a fiber yarn sheet with a width of 16mm, and wrap the fiber yarn sheet at the end of the mandrel for 5 turns to fix it; The distance H of the mold surface is set to 50mm;

Turn on the winding device, and continuously wind the fiber yarn on the mandrel to ensure that the fiber covers the surface of the mold, the winding tension is 1.5kN, and the winding speed is 1.3m/s; the fiber yarn is covered with the fiber yarn on the surface of the mandrel. , winding layer by layer from the inside to the outside, the winding angle of the inner fiber layer is 56°, the winding angle of the outermost two fiber layers is 90°, and the stop angle of the head is 120°; during the winding process, pay attention to scraping glue, control Glue content;

After winding, wrap a layer of polyester film protection tape on the outside to prevent the uncured glue from dripping and get a semi-finished product;

4) Curing: The semi-finished product obtained in step 3) is placed in a curing furnace for stage-by-stage curing. The stage-by-stage curing means that the semi-finished product is kept at 90°C for 90 minutes, at 120°C for 150 minutes, and at 160°C. Keep warm for 30 minutes, then cool down;

After cooling, use a demoulding machine to demould, that is to say.

Example 3

The winding tube for hollow composite insulators in this embodiment is formed by winding and curing glass fibers impregnated with epoxy resin glue. The epoxy resin glue is composed of the following raw materials in parts by weight: 120 parts of epoxy resin, methyl tetra 50 parts of hydrophthalic anhydride, 8 parts of propylene oxide butyl ether, 5 parts of 2,4,6-tris(dimethylaminomethyl)phenol, 0.1 part of BYK A530 defoamer; the glue content of the winding tube is 30 % (mass percentage). The glass fiber is an alkali-free glass fiber roving.

The manufacturing method of the wound pipe for the hollow composite insulator of this embodiment, the process flow is shown in Figure 1, including the following steps:

1) Glue compounding: Mix E51 type epoxy resin, methyl tetrahydrophthalic anhydride, propylene oxide butyl ether, 2,4,6-tris(dimethylaminomethyl)phenol and BYK A530 defoamer in the formula amount Prepare epoxy resin glue uniformly, heat the epoxy resin glue at 50°C for 8 hours, and put it into a glue tank with constant temperature at 60°C; the viscosity of the epoxy resin glue is controlled at 0.45Pa·s ;

2) Mold treatment: take the mandrel, and apply a release agent on the mandrel surface;

3) Dipping and winding: select 9 balls of non-alkali glass fiber roving, and dry the non-alkali glass fiber roving at 80°C for 24 hours before use;

Lead out 9 strands of non-alkali glass fiber roving from the fiber frame to pass through the glue tank to impregnate the fiber and form a fiber yarn sheet with a width of 14mm, and wrap the fiber yarn sheet at the end of the mandrel for 7 turns to fix it; The distance H of the mold surface is set to 40mm;

Turn on the winding device, and continuously wind the fiber yarn on the mandrel to ensure that the fiber covers the surface of the mold, the winding tension is 1.1kN, and the winding speed is 1.5m/s; the fiber yarn covering the surface of the mandrel is a fiber layer , winding layer by layer from the inside to the outside, the winding angle of the inner fiber layer is 52°, the winding angle of the outermost two fiber layers is 90°, and the stop angle of the head is 120°; during the winding process, pay attention to scraping glue, control Glue content;

After winding, wrap a layer of polytetrafluoroethylene film protection tape on the outside to prevent the uncured glue from dripping and get a semi-finished product;

4) Curing: The semi-finished product obtained in step 3) is placed in a curing furnace for stage-by-stage curing. The stage-by-stage curing means that the semi-finished product is kept at 90°C for 90 minutes, at 120°C for 150 minutes, and at 160°C. Keep warm for 30 minutes, then cool down;

After cooling, use a demoulding machine to demould, that is to say.

Experimental example

In this experimental example, the performance of the wound tube for hollow composite insulators obtained in Examples 1-3 was tested, and the results are shown in Table 1.

Table 1 The performance test results of the wound tube for the hollow composite insulator obtained in Examples 1-3

project Example 1 Example 2 Example 3

Fiber content 75% 73% 70% Water absorption/% 0.0611 0.0526 0.0489 Bending strength/MPa 134 125 119 Volume resistivity/Ω·cm 3.9×10 ¹³ 4.4×10 ¹³ 5.1×10 ¹³ Density g/cm ³ 2.05 1.99 1.91

It can be seen from Table 1 that the water absorption of the wound pipe for hollow composite insulators obtained in Examples 1-3 is 0.0489%-0.0611%, the bending strength is 119-134MPa, and the volume resistivity is (3.9-5.1)×10 ¹³ Ω· cm. Experimental results show that the winding pipe for hollow composite insulators of the present invention has moderate glue content, good compactness and air tightness, good mechanical properties and insulation performance, and meets the use requirements of winding pipes for hollow composite insulators in power grids and substations.

Claims (6)

1. A winding tube for hollow composite insulators, characterized in that: the winding tube is formed by winding and curing glass fibers impregnated with epoxy resin glue, and the epoxy resin glue is composed of the following raw materials in parts by weight: epoxy 80-120 parts of resin, 50-80 parts of curing agent, 5-10 parts of diluent, 2-5 parts of accelerator, 0.1-0.5 parts of defoamer; the epoxy resin is EPCYD-128 epoxy resin; the The curing agent is JHY906 methyl tetrahydrophthalic anhydride curing agent; the diluent is propylene oxide butyl ether; the glue content of the winding tube is 25% to 30%; the diluent is reactive diluent 660; The accelerator is 2,4,6-three (dimethylaminomethyl) phenol; the glass fiber is an alkali-free glass fiber untwisted yarn; The coiled tube is made by a method comprising the following steps: 1) Glue compounding: Mix the epoxy resin, curing agent, diluent, accelerator and defoamer evenly to make epoxy resin glue, and put the epoxy resin glue into the constant temperature glue tank; 2) Mold treatment: Take the core mold and apply a release agent on the surface of the core mold; 3) Dipping and winding: pass multiple strands of glass fiber untwisted yarn through the glue tank to impregnate the fiber and form a fiber yarn sheet. After the fiber yarn sheet is drawn out and fixed at the end of the mandrel, the fiber yarn sheet is continuously wound on the mandrel. , the winding angle is 52°～56°, the winding tension is 1.1～2kN, and the winding speed is 1.0～1.5m/s; after winding, wrap a layer of film protection tape on the outside to get a semi-finished product; 4) Curing: The semi-finished product obtained in step 3) is cured and then released from the mold; In step 4), the curing is staged curing, and the staged curing means that the semi-finished product is kept at 90°C for 90 minutes, at 120°C for 150 minutes, and at 160°C for 30 minutes. 2. A method for preparing a wound pipe for hollow composite insulators according to claim 1, characterized in that: comprising the following steps: 1) Glue compounding: Mix the epoxy resin, curing agent, diluent, accelerator and defoamer evenly to make epoxy resin glue, and put the epoxy resin glue into the constant temperature glue tank; 2) Mold treatment: Take the core mold and apply a release agent on the surface of the core mold; 3) Dipping and winding: pass multiple strands of glass fiber untwisted yarn through the glue tank to impregnate the fiber and form a fiber yarn sheet. After the fiber yarn sheet is drawn out and fixed at the end of the mandrel, the fiber yarn sheet is continuously wound on the mandrel. , the winding angle is 52°～56°, the winding tension is 1.1～2kN, and the winding speed is 1.0～1.5m/s; after winding, wrap a layer of film protection tape on the outside to get a semi-finished product; 4) Curing: The semi-finished product obtained in step 3) is cured and released from the mold. 3 . The method for preparing wound pipes for hollow composite insulators according to claim 2 , wherein in step 1), the temperature of the glue tank is 60° C. 4. The method for preparing wound tubes for hollow composite insulators according to claim 2, characterized in that: in step 3), 9 to 12 strands of glass fiber untwisted yarns are passed through the glue tank to impregnate the fibers and form a width of 14 ~ 20mm fiber yarn sheet. 5. The method for preparing wound tubes for hollow composite insulators according to claim 2, characterized in that: in step 3), the surface of the mandrel is covered with fiber yarn sheets to form a fiber layer, and the winding angle of the inner fiber layer is is 52°～56°, and the winding angle of the outermost two fiber layers is 90°. 6 . The method for preparing wound tubes for hollow composite insulators according to claim 2 , wherein the film protection tape is a polyester film or a polytetrafluoroethylene film. 6 .