WO2016127509A1

WO2016127509A1 - Coating method for umbrella/bell-shaped insulator rtv antifouling flashing coating

Info

Publication number: WO2016127509A1
Application number: PCT/CN2015/078465
Authority: WO
Inventors: 陈群跃; 张先银; 周宁; 陶云峰; 方辉
Original assignee: 成都拓利科技股份有限公司
Priority date: 2015-02-11
Filing date: 2015-05-07
Publication date: 2016-08-18
Also published as: WO2016127508A1

Abstract

A coating method for an umbrella/bell-shaped insulator RTV antifouling flashing coating, characterized in comprising the following steps: (A) cleaning the surface of an insulator, and optionally covering a part of the insulator for which coating is not required; (B) immersing the insulator into a coating for rotary coating by using a coating machine having a rotary function; and, (C) solidifying the coated insulator in room temperature and humid conditions. The coating method is simple to operate, inexpensive, of reduced pollution, and safe to produce, allows automated control for a process from immersed coating to preliminary solidification, easy-to-control product quality, and high productivity, provides a smooth appearance free of bubbles, free of hanging drips, free of accumulations, even coating, and uniform thickness.

Description

Method for coating umbrella and bell-shaped insulator RTV anti-soil flash paint

Technical field

The invention belongs to the field of insulators, and in particular relates to a method for coating an umbrella and a bell-shaped insulator RTV anti-soil flash paint.

Background technique

Umbrella and bell-shaped insulators are widely used in substations and high-voltage transmission lines. They are a kind of commonly used outdoor insulators, and their application places determine that they need good anti-pollution performance. In order to avoid the occurrence of pollution flashover accidents, various measures such as increasing the creepage distance, water rinsing, semiconductor glaze insulator and spraying hydrophobic paint are generally adopted. However, in the anti-pollution flashover of substations and high-voltage electric transmission lines, the creepage distance is limited, and it is time-consuming to replace equipment or external insulation components. Although water washing is effective, it is very laborious to maintain. In order to improve the electrical performance of porcelain and glass insulators under wet conditions, current measures such as spraying RTV coating on the surface are used. The hydrophobicity and hydrophobic migration of RTV coatings can improve the flashover performance of the insulator.

Ice coating on high-voltage transmission lines caused by freezing rain, wet snow, frost, etc. is also one of the main problems affecting the safety of power systems. Ice-covered transmission lines can often lead to power outages, wire breaks, tower collapses, wire dancing, and insulator flashovers, which can cause huge economic losses. Applying super-hydrophobic coating to the surface of the insulator can also reduce accidents caused by snow and ice.

At present, RTV coatings are applied to umbrellas and bell-shaped insulators. The main construction methods are spraying, dip coating and brushing. The construction methods are mostly in the field, and the quality of the painted RTV anti-smudge flash coating cannot be Guaranteed. In addition, due to the special structure of the umbrella and bell-shaped insulators, the shape is complex, especially the umbrella insulators of two, three or more layers, the seam of the umbrella ring is deep, the dead angle is easy to occur during the spraying process, and the spraying is uneven, and the thickness is difficult to grasp. It is easy to produce paint dripping, skinning, accumulation and bubble generation, which is of poor quality and unstable. In the spraying process, after spraying once, the paint surface needs to be sprayed again, and the surface is dried repeatedly, with long interval, time-consuming and labor-intensive, and the production efficiency is relatively low.

Summary of the invention

In order to solve the above technical problems, the present invention provides a method for coating an umbrella and a bell-shaped insulator RTV anti-smudge flash coating, which is simple in operation, low in cost, low in pollution, safe in production, easy to control in quality, high in productivity, and coated. Uniform and uniform thickness.

A method for coating an umbrella or bell-shaped insulator RTV anti-smudge flash paint according to the present invention for solving the above technical problems, comprising an umbrella or a bell-shaped insulator, a coating device, a paint, and a tooling tool, comprising the following steps :

(A) cleaning the surface of the insulator, optionally covering the portion of the insulator that does not require coating (eg Such as the use of transparent adhesive tape to cover the parts that do not require coating);

(B) using a coating machine with a rotating function (rotary coater), immersing the insulator in the coating for spin coating;

(C) Curing the coated insulator at ambient temperature and humidity. For example, it is placed in a ventilated environment at a temperature of 1 to 50 ° C, preferably 18 to 40 ° C, preferably 18 to 25 ° C, and a humidity of 40 to 85%, and the curing time is maintained for 22 to 25 hours. The wet state means, for example, a humidity of 20 to 90%, preferably 40 to 85%, preferably 55 to 65%.

Preferably, the spin coating comprises at least a dip coating step in which the insulator is immersed in the coating and a dip coating step after the insulator leaves the coating surface. The dip coating step is to spin the coating partially or completely into the coating, rotating at a speed of 1 to 50 rpm, time 10 ~300s; the step of dip is to rotate the insulator away from the coating liquid surface for 1 to 20 minutes, and the rotation speed is 5 to 150 rpm.

After curing, it can detect the presence or absence of mechanical impurities on the surface of the insulator, whether it is bumped, scratched, accumulated or flow marks; whether there are mechanical impurities on the surface of the insulator, whether there are any bumps, scratches, streaks, flow marks, sample thickness and Adhesion, that is, the surface of the blade was scraped at a diagonal angle of 30°, and the thickness of the coating was measured by a thickness gauge. The difference in thickness between the two coatings was within ±0.02 mm for uniform coating.

The insulator may be immersed in the coating in such a manner that the insulator is wholly or partially immersed in the coating. In the case of partial immersion, the depth of the immersion is such that substantially all parts of the insulator can be immersed in the coating during spin coating. The coating may be a coating commonly used for coating insulators, which is an RTV anti-fouling coating that meets the power industry standards; dl/t627-2012 standard or supplementary documentation requirements. The coating has a solid content of 50 to 100%. The coating includes, for example, the following components (parts by weight):

Active polydimethylsiloxane mixture 40-60 parts;

5-10 parts of hydrophobic migration aid;

Reinforced gas phase white carbon black 8-30 parts;

Flame retardant packing 15-32 parts;

Crosslinking agent 3-8 parts;

Tackifier 0.5-5 parts;

Vulcanization accelerator 0.01-1.0 parts;

Pigment 0.1-5 parts;

Solvent oil 15-35 parts.

The reactive polydimethylsiloxane mixture is a terminal hydroxyl polydimethylsiloxane, an alkoxy polydimethylsiloxane, a polydimethylsiloxane having a hydroxyl group in between, and an alkoxy group in between. One or any mixture of polydimethylsiloxanes.

Preferably, the polydimethylsiloxane containing a hydroxyl group or an alkoxy group in the middle is an MQ resin having a hydroxyl group or an alkoxy group, MDQ resin, or MDTQ resin.

The hydrophobic migration aid is composed of mixed inert polydimethyloxane of different viscosity, wherein the low viscosity inert polydimethylsiloxane has a content of 10% to 100% by weight and a viscosity of 5 to 500 mm ² /s; The high viscosity inert polydimethylsiloxane has a content of 0 to 90% by weight and a viscosity of 100 to 10000 mm ² /s. Preferably, the low viscosity inert polydimethyloxane has a viscosity of 50 to 300 mm ² /s, and the high viscosity inert polydimethyloxane has a viscosity of 500 to 1000 mm ² /s. Preferably, the low viscosity polydimethyloxane content is 50% by weight, and the high viscosity polydimethylsiloxane content is 50% by weight.

Preferably, the fumed silica having a specific surface area of the fumed silica is 150 to 300 m ² /g, and the surface is treated with a silane coupling agent.

Preferably, the flame retardant filler is an aluminum-based, phosphorus-based, or amine-based flame retardant. Further, the flame retardant filler is a mixture of aluminum hydroxide and a bromine-based flame retardant, wherein a mixing ratio of the aluminum hydroxide to the bromine-based flame retardant is 10:90 (weight ratio).

The crosslinking agent is composed of a tin-catalyzed deketonoxime-type crosslinking agent or a de-methanol-type crosslinking agent of an organotitanium catalyst system.

Preferably, the tackifier is one or any mixture of silane coupling agents containing epoxy, amino, sulfhydryl and acrylate groups. Further preferably, the tackifier is one or any mixture of silane coupling agents containing an epoxy group and an amino group.

The vulcanization accelerator is preferably an organotin, and more preferably dibutyltin dilaurate.

The pigment is, for example, titanium dioxide or iron oxide red. Preferably, the pigment is rutile titanium dioxide or surface treated iron red.

The solvent oil preferably consists of solvent gasoline or petroleum ether. Further preferably, the solvent oil is a solvent gasoline, and the solvent gasoline is a mixture of 120# and 200#, wherein 120# accounts for 80% to 95% by weight, and 200# accounts for 5% to 20% ( weight).

Preferably, the coating has a solid content of 70 to 80% and a coating dry time of 20 to 45 minutes.

The viscosity of the coating is 4 cups of test, the viscosity is 5 to 50 min; preferably the viscosity (coating - 4 cups) is 18 to 26 minutes.

The spin coating step in the step (3) preferably includes a dip coating, a dip coating, a cuffing and a rinsing step. Among them, the steps of picking, closing and trimming are carried out with the insulator leaving the coating liquid level.

The dip coating step is a tilting of the coating equipment head to immerse the insulator in the paint, and the downward inclination is 90° to 0° (the angle of the longitudinal axis of the insulator with respect to the vertical line of the horizontal plane, the angle α shown in FIG. 1 The rotation speed is 1 to 50 rpm and the time is 10 to 300 s. Preferably, the dip coating step has a downward inclination of 50 to 40 degrees, a rotation speed of 5 to 15 r.pm, and a time of 50 to 120 s. Different speeds can be produced according to requirements, and the coating can be evenly distributed. Tilt down and at an appropriate angle to completely immerse the insulator in the coating, eliminating air bubbles generated when the insulator is immersed in the coating, and not allowing the insulator to be dip coated The square is immersed in the paint.

The step of dip is to rotate the insulator away from the liquid level of the coating for 1 to 20 minutes, the rotation speed is 5 to 150 rpm, and the insulator is inclined downward by 90 to 0. Preferably, the step of dip is to rotate the insulator completely away from the liquid level of the coating for 2 to 5 minutes, the rotation speed is 50 to 90 rpm, and the downward inclination is 50 to 40 degrees. The trick is to get rid of excess paint on the insulator and make the coating uniform.

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination of the vertical line with respect to the horizontal plane is 1° to 90°, the time is 10-200 s, and the rotation speed is 5 to 50 rpm; the step of closing is to rotate the insulator to the horizontal direction. Place, tilt down 30 ° ~ up 30 °, surface dry time 45 ~ 80min, speed 1 ~ 100rpm. Preferably, the closing step has an inclination of 20° to 50°, a time of 30 to 90 s, and a rotation speed of 15 to 20 rpm; and the step of closing is to place the coating device head adjusting the insulator in a horizontal direction, and the inclination is 10° downward. ~ Up 10 °, surface dry time 45 ~ 80min, speed 10 ~ 15rpm. The purpose of closing and closing is to make the coating on the edge of the insulator flow back to the insulator surface evenly, to ensure that there is no convex or concave state on the umbrella surface of the insulator and defects such as accumulation and dripping of the coating.

Preferably, the curing time is 24 to 36 h, the temperature is 18 to 25 ° C (for example, 20 ° C), and the humidity is 55 to 65%.

The coating has a solid content of 55 to 65%.

The coating has a solids content of 60%.

In the present invention, the spin coater can be applied by an automatic rotary dip coater manufactured by Chengdu Tuoli Chemical Industry Co., Ltd., but is not limited thereto.

The rotary dip coater comprises a main frame, a head rotating frame, a deceleration frequency regulating motor and an insulator quick connector, wherein the head rotating frame is rotatably connected to the main frame through a corner shaft and a bearing seat at both ends thereof. A deceleration frequency modulation motor is fixedly disposed on the rotating frame of the mechanism, and an output shaft of the deceleration frequency modulation motor is connected to the insulator quick connector. The other end of the insulator quick connector is used to connect the insulator during dip coating, and an insulator quick connector having a matching tip shape is selected for different types of insulators. The rotation of the insulator can be driven by a deceleration frequency modulation motor, and the rotation speed can be, for example, any value in the range of 1-300 rpm, for example 1-150 rpm, thereby effecting a spin coating operation of the insulator in the dip coating liquid.

Further preferably, the rotary dip coater further includes a PLC control box, and the deceleration frequency modulation motor is connected to the PLC control box through a data line. The PLC control box is used to automatically control the working process of the decelerating frequency-modulated motor, which can precisely control the rotation speed of the insulator at different stages in the dip coating process to ensure uniform coating and smooth appearance. Since the speed of the deceleration frequency modulation motor will be controlled at tens of revolutions per minute during the dip coating process, even in the slowest phase, only a few turns, the volatile solvent in the dip coating liquid is less than 50%, for the environment and the human body. The health impact is small.

Further preferred for the above solution, further comprising a corner reducer and a corner motor, the input end of the angle reducer being connected to the output shaft of the angle motor, and the output end being connected to the bearing housing. By this preferred embodiment, The corner reducer and the corner motor can adjust the distal end of the output shaft of the deceleration motor (ie, the end connected to the insulator quick connector) within a range of 180 degrees from downward to upward, that is, the output shaft The angle between the longitudinal axis and the vertical line of the horizontal plane can be adjusted between 0 and 180 degrees, so that the spin coating of the insulator immersed in the dip coating liquid and the drying, closing and closing after leaving the immersion liquid surface can be realized. Side operation. At the same time, the angle of the insulator immersed in the dip coating liquid at different stages can be accurately and stably controlled, thereby avoiding the generation of bubbles in the coating, and the quality of the dip coating is further ensured.

Further preferably, the above-described aspect is that the corner motor is connected to the PLC control box via a data line. Through the PLC control box, the angle of the insulator immersed in the dip coating liquid at different stages is automatically controlled, and the reliability is higher. Moreover, after the automatic control of the deceleration frequency modulation motor and the angle motor, the operator will not have to stay on the site at all times, so as to avoid the influence of the volatile solvent on the human health during the dip coating process as little as possible.

Further preferably, the PLC control box is further provided with a control button as a switch.

Further preferably, the PLC control box is mounted on a lower portion of the main frame, and the control button is mounted on an upper side of the main frame.

The above two preferred technical means are mainly for making the layout of each device more compact and more convenient to operate.

In one embodiment, in order to be suitable for connection with the insulator quick connector, the end structure of the output shaft of the deceleration frequency modulation motor includes a quick joint main shaft and a quick joint nut, and a taper guide is axially opened in the lower end portion of the quick joint main shaft. a hole, the inner end of the taper guiding hole further defines a rectangular hole in the axial direction, and a short joint nut hanging edge is further disposed on the outer surface of the lower end of the quick joint main shaft, and the quick joint nut is opened on the surface of the inner hole The threaded, quick joint nut also has a circular through hole matching the quick joint main shaft on the upper end cover, and the through hole is used to cover the main shaft of the quick joint to slide down until it is blocked at the hanging position of the joint. Preferably, the taper pilot hole has a taper of 1-30°, preferably 2-15°, preferably 3°.

In one embodiment, the insulator quick connector includes a connecting rod main body, and the bottom of the connecting rod main body is provided with a bolt hole bolted to the insulator, and the upper part of the connecting rod main body is divided into a rectangular section and a guiding column section from top to bottom. And the quick-connecting thread segment, the connecting rod main body surface is also provided with the loading and unloading rod at a position below the quick-connecting thread segment.

Preferably, a hook hole is further disposed at the top of the rectangular section. The function of the hook hole is that after the insulator is dip coated, the hook hole can be directly used for hanging and drying. Preferably, the guide column section has a taper of from 1 to 30, preferably from 2 to 15, preferably from 3.

When using, first connect the lower end of the insulator quick-connect connector to the insulator bolt by bolts, then insert the upper end directly into the hole of the end structure of the output shaft of the deceleration frequency modulation motor, and tighten the quick joint nut on the end structure to achieve quick connection.

The main beneficial effects of the automatic dip coating process in the present invention are as follows:

A. The product has high quality, smooth surface, no air bubbles, uniform coating thickness, no accumulation, no dripping;

B. Because it is a rotary dip coating, a coating that is substantially free of solvent or less solvent can be used, so VOC emissions are reduced by 50% compared to the spraying process;

C. Environmental protection and safety pressures are small;

D. Little impact on the health of construction workers;

E. Convenient for on-site factory coating of insulator manufacturers, no need for secondary packaging and secondary long-distance transfer, no need for field application.

DRAWINGS

Figure 1 is a right side view of the apparatus of the present invention.

Figure 2 is a top plan view of the apparatus of the present invention.

3 is a cross-sectional view showing an end structure of an output shaft of a speed reduction motor.

Figure 4 is a front elevational view of the insulator quick connector.

Figure 5 is a left side view of the insulator quick connector.

detailed description

In the following examples, the coating was applied by an automated rotary dip coating machine manufactured by Chengdu Tuoli Chemical Industry Co., Ltd., and the coating was produced by Chengdu Tuoli Chemical Industry Co., Ltd. or other special RTV dip coating anti-pollution flash coatings on the market.

This embodiment is a preferred embodiment of the present invention, as shown in FIGS. Apparatus for coating RTV anti-smudge flash coatings for porcelain or glass umbrella type and bell-type insulators, comprising a main frame 1, a head rotating frame 7, a deceleration frequency adjusting motor 8 and an insulator quick-connecting connector 9, the head rotating The frame 7 is rotatably connected to the main frame 1 through a corner shaft 4A and a bearing block 4B at both ends thereof. A deceleration frequency adjusting motor 8 is fixedly disposed on the mechanism rotating frame 7, and an output shaft of the deceleration frequency adjusting motor 8 is disposed. It is connected to the insulator quick connector 9 and can drive the insulator to rotate at any speed in the range of 1-300 rpm, for example, 1-150 rpm. It also includes a PLC control box 2, which is connected to the PLC control box 2 via a data line. Furthermore, a corner reducer 5 and a corner motor 6 are connected, the input end of the angle reducer 5 is connected to the output shaft of the angle motor 6, and the output end of the angle reducer 5 is connected to the bearing housing 4. The corner motor 6 is connected to the PLC control box 2 via a data line. The corner reducer 5 and the corner motor 6 can adjust the distal end of the output shaft of the deceleration frequency adjusting motor 8 (ie, the end connected to the insulator quick connector) within a range of 180 degrees from downward to upward, ie The angle between the longitudinal axis of the output shaft and the vertical line of the horizontal plane can be adjusted between 0-180 degrees, so that the spin coating of the insulator immersed in the dip coating liquid and the drying after leaving the immersion liquid surface can be achieved. Closing and closing operations.

The PLC control box 2 is also externally connected with a control button 3 as a switch.

The PLC control box 2 is mounted on a lower portion of the main chassis 1, and the control button 3 is mounted on an upper side of the main chassis 1.

In the present invention, the insulator workpiece 10 is mounted on the end of the insulator quick connector 9 to raise the dip coating tank 11 so that the insulator workpiece 10 is immersed in the dip coating liquid, and the dip coating process can be started. .

As shown in FIG. 3, the end of the output shaft of the speed reduction motor 8 of FIGS. 1 and 2 includes a quick joint main shaft 801 and a quick joint nut 805. A taper guiding hole 803 is defined in the lower end portion of the main shaft 1 of the quick joint. The taper guiding hole 803 has a taper of 3°. The inner end of the taper guiding hole 803 further defines a rectangular hole 802 in the axial direction. A short joint nut hanging edge 8044 is further provided on the outer surface of the lower end of the quick joint main shaft 801. The quick connector nut 805 has an internal thread 806 on the surface of the inner hole, and the quick connector nut 805 also defines a circular through hole matching the quick connector main shaft 801 on the upper end cover thereof, and uses the through hole to cover the quick joint main shaft. The 801 slides down until it is blocked at the position of the quick joint nut hanging edge 804.

As shown in FIGS. 4 and 5, an insulator connecting rod includes a connecting rod main body 906. The bottom of the connecting rod main body 906 is provided with a bolt hole 907 which is bolted with an insulator. The upper part of the connecting rod main body 906 is divided from top to bottom. The rectangular section 902, the guide post section 903 and the quick-connect thread section 904, the surface of the connecting rod main body 906 is also provided with a loading and unloading rod 905 at a position below the quick-connecting thread section 904. A hook hole 901 is also disposed at the top of the rectangular section 902. After the insulator is dip coated, the connecting rod is not removed, and the hook hole 901 on the connecting rod is directly used for hanging and drying. When the hook hole 901 is provided, it is to be noted that the total length of the hook hole 901 and the rectangular segment 902 is smaller than the rectangular hole depth in the connector shown in FIG. The guiding column section 3 has a taper of 3°. The taper of the taper guide hole on the connector shown in Fig. 3 is also correspondingly 3°. The loading and unloading rods 905 have at least two and are evenly distributed on the circumference to maintain the symmetry of the structure and the balance of the force.

The coatings in the examples were prepared as follows:

45 parts of α,ω-dihydroxypolydimethylsiloxane and dimethyl silicone oil were put into a biaxial kneader, stirred and kneaded for 10-25 minutes, then 15 parts of reinforcing fumed silica was added, and then kneaded. 10 to 50 minutes, finally add 20 parts of aluminum hydroxide and 12 parts of bromine-based flame retardant, knead for 10-40 minutes to obtain the base rubber; the base rubber is ground in a three-roll machine for 2-3 times; The base rubber is then put into the biaxial kneader again, stirred and heated to a temperature of 100 ° C to start vacuuming, maintaining the set temperature at 150-160 ° C, vacuum degree in the state of 0.06-0.09 Mpa vacuum drying for 3 hours; Stop heating and vacuuming, naturally cool to 90-120 ° C under nitrogen; then measure the cooled base rubber into the planetary stirred tank, first add 4 parts of the pigment, mix and stir evenly, then add the total amount of solvent oil required. 20-30%, stirring for 20-40 minutes, Then add 3 parts of cross-linking agent and 0.04 parts of vulcanization accelerator for 10-20 minutes, then add silane coupling agent for 10-20 minutes, and finally add the remaining solvent oil under high pressure and stir for 20-35 minutes, then package. Finished product.

Example 1

A method for coating an umbrella and a bell-shaped insulator RTV anti-smudge flash paint is as follows:

(1) Pretreatment: Clean the tested insulators and pre-treat the gold fittings; check whether the insulators have the certificate, the defects on the surface of the insulator, cracks, damage, pores, mechanical impurities, and oil that is difficult to clean.

(2) On the machine: the insulator is connected to the machine head, and the paint is placed in the tooling; the insulator can be tested for the certificate, the surface of the insulator is defective, crack, damage, pores, mechanical impurities, oil that is difficult to clean, etc. .

(3) Painting: The insulator is immersed in the coating for spin coating; during the rotation process, the coating is applied to prevent uneven coating, dripping and accumulation of the coating on the insulator during the coating process. The spin coating process is a dip coating, dip coating, cuffing and edge removal step, the coating solid content is 60%, the paint surface drying time is 30 min, the coating viscosity is 4 cups of coating test, and the viscosity is 20 min.

The dip coating step is that the coating device head tilts to immerse the insulator in the paint, and the downward inclination is 40°, the rotation speed is 5 rev/min, and the time is 50 s; the rotation speed is different, and different thicknesses can be generated according to requirements, and the coating is performed. Pack evenly. Tilt down and at an appropriate angle to completely immerse the insulator in the coating, to remove air bubbles from the insulation when the insulator is immersed in the coating, and to prevent the insulator from immersing in the coating where it is not required to be painted.

The dip step is to rotate the insulator completely away from the coating liquid surface for 2 min, the rotation speed is 50 rpm, and the downward inclination is 40°, and the dip is to remove excess paint on the insulator.

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination is 20°, the time is 30s, the rotation speed is 20 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is 5°, and the drying time is 45min, speed 10 rev / min.

(4) Lower machine, detection: Remove the insulator in step (3), check the appearance of the insulator; check whether the appearance is damaged or scratched, the insulator should have no leaking coating surface, and whether the upper surface coating is smooth, leveling, no Bubbles, the lower surface is coated with no accumulation, dripping, no bubbles, and there are no accumulation, dripping, and no bubbles along the mouth.

(5) Storage curing: The insulator in step (4) is placed in a ventilated environment at a temperature of 18 ° C and a humidity of 55% for a curing time of 22 h.

(6) Detection: Detect whether there are any mechanical impurities on the surface of the insulator, whether there are any bumps, scratches, deposit marks or flow marks; whether there are mechanical impurities on the surface of the insulator, whether there are any bumps, scratches, streaks, flow marks, sampling test Thickness and adhesion, that is, the surface of the blade is scraped at a diagonal angle of 30°, and the thickness of the coating is measured by a thickness gauge. The difference in thickness between the two coatings is within ±0.02 mm for uniform coating.

(7) Packaging, storage or transportation. The pass rate in this example is 100%.

Example 2

The other steps were as in Example 1, the coating solids content was 65%, and the coating dry time was 20 min.

The viscosity of the coating was 4 cups tested and the viscosity was 15 min.

The dipping step is that the coating equipment head tilts to immerse the insulator in the paint, and the downward inclination is 50 ° C, the rotation speed is 15 rev / min, and the time is 50 s.

The dip step is to rotate the insulator completely away from the liquid level of the coating for 5 min, the rotation speed is 90 rpm, and the downward inclination is 50°.

The closing step is to adjust the insulation of the coating equipment head, the inclination is 30°, the time is 90s, the rotation speed is 15 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is -5°, and the surface drying time is 80min. , the speed is 10 rev / min.

Curing time 25h, temperature 23 ° C, humidity 65%. The pass rate in this example is 100%.

Example 3

The other steps were as in Example 1, the paint solids content was 55%, and the paint dry time was 45 min.

The viscosity of the coating was 4 cups tested and the viscosity was 50 min.

The dip step is the tilting of the coating equipment head, and the insulator is immersed in the coating for spin coating, the downward inclination is 45°, the rotation speed is 10 rev/min, and the time is 60 s; the dip step is to rotate the insulator completely after leaving the coating liquid surface for 3 min. The speed is 60 rev / min and the downward inclination is 45 °.

The closing step is to adjust the insulation of the coating equipment head, the inclination is 25°, the time is 40s, the rotation speed is 18 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is 0°, and the surface drying time is 60 minutes. The speed is 12 rpm.

Curing time 24h, temperature 20 ° C, humidity 60%. The pass rate in this example is 100%.

Example 4

The other steps were as in Example 1, the paint solids content was 58%, and the paint dry time was 25 min.

The viscosity of the coating was 4 cups tested and the viscosity was 18 min.

The dip step is the tilting of the coating device head, and the insulator is immersed in the coating for spin coating, the downward inclination is 42°, the rotation speed is 8 rev/min, and the time is 70 s; the dip step is to rotate the insulator completely after leaving the coating liquid surface for 4 min. The speed is 70 rpm, and the downward inclination is 42°.

The closing step is to adjust the insulation of the coating equipment head, the inclination is 23°, the time is 70s, the rotation speed is 16 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is 2°, and the surface drying time is 75 minutes. The speed is 14 rpm.

Curing time 23 h, temperature 22 ° C, humidity 58%. The pass rate in this example is 100%.

Example 5

The other steps were as in Example 1, the coating solids content was 62%, and the coating dry time was 40 min.

The viscosity of the coating was 4 cups tested and the viscosity was 26 min.

The dipping step is that the coating device head tilts to immerse the insulator in the paint, and the downward inclination is 47°, the rotation speed is 12 rev/min, and the time is 80 s.

The dip step is to rotate the insulator completely away from the liquid level of the coating for 3 minutes, the rotation speed is 80 rev / min, and the downward inclination is 47 °.

The closing step is to adjust the insulation of the coating equipment head, the inclination is 28°, the time is 80s, the rotation speed is 17 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is -2°, and the surface drying time is 50min. The speed is 13 rpm.

Curing time 24h, temperature 21 ° C, humidity 62%.

Example 6

The other steps are as in Example 1, the solid content of the paint is 64%, wherein the dip step is the tilting of the coating equipment head, and the insulator is immersed in the paint for spin coating, the downward inclination is 46°, the rotation speed is 6 rev/min, and the time is 90 s. .

The dip step is to rotate the insulator 4 minutes after the insulator completely leaves the coating liquid level, the rotation speed is 75 rpm, and the downward inclination is 46 °C.

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination is 26°, the time is 50s, the rotation speed is 19 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is 1°, and the surface drying time is 70 minutes. The speed is 11 rpm.

The curing time was 23 h, the temperature was 19 ° C, and the humidity was 56%.

Example 7

The other steps are as in Example 1, the solid content of the coating is 70%, wherein the dip step is the tilting of the coating equipment head, and the insulator is immersed in the coating for spin coating, the downward inclination is 44°, the rotation speed is 14 rev/min, and the time is 75 s. .

The dip step is to rotate the insulator 4 minutes after the insulator completely leaves the coating liquid level, the rotation speed is 65 rpm, and the downward inclination is 44°.

The closing step is to adjust the insulation of the coating equipment head, the inclination is 22°, the time is 60s, the rotation speed is 19 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is -1°, and the surface drying time is 65min. The speed is 13 rpm.

Curing time 24h, temperature 20 ° C, humidity 62%.

Example 8

The other steps are as in Example 1, the solid content of the paint is 80%, wherein the dip step is the tilting of the coating equipment head, and the insulator is immersed in the paint for spin coating, the downward inclination is 90°, the rotation speed is 1 rev/min, and the time is 300 s. .

The dip step is to rotate the insulator completely away from the coating liquid surface for 1 min, the rotation speed is 150 rev / min, and the downward inclination is 90 °.

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination is 1°, the time is 200s, the rotation speed is 5 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is upward 30°, and the surface drying time is 45 min. The speed is 100 rpm.

Curing time 24h, temperature 20 ° C, humidity 62%.

Example 9

The other steps are as in Example 1, the solid content of the coating is 70%, wherein the dip step is the tilting of the coating equipment head, and the insulator is immersed in the coating for spin coating, the downward inclination is 0°, the rotation speed is 50 rev/min, and the time is 10 s. .

The dip step is to rotate the insulator completely away from the coating liquid surface for 20 min, the rotation speed is 5 rev / min, and the downward inclination is 0 °.

The closing step is to adjust the insulation of the coating equipment head, the inclination is 90°, the time is 10s, the rotation speed is 50 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is upward 30°, and the surface drying time is 80 min. , the speed is 1 rev / min.

Curing time 24h, temperature 20 ° C, humidity 60%.

Example 10

The other steps are as in Example 1, the solid content of the coating is 100%, wherein the dip step is the tilting of the coating equipment head, and the insulator is immersed in the coating for spin coating, the downward inclination is 70°, the rotation speed is 40 rpm, and the time is 200 s. .

The dip step is to rotate the insulator 10 minutes after the insulator completely leaves the coating liquid level, the rotation speed is 30 rev / min, and the downward inclination is 70 °.

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination is 70°, the time is 100s, the rotation speed is 30 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is 10° downward, and the drying time is 65 min, speed 50 rpm.

Curing time 24h, temperature 20 ° C, humidity 62%.

Example 11

The other steps are as in Example 1, the solid content of the coating is 50%, wherein the dip step is the tilting of the coating equipment head, and the insulator is immersed in the coating for spin coating, the downward inclination is 20°, the rotation speed is 30 rpm, and the time is 250 s. .

The dip step is to rotate the insulator 15 minutes after the insulator completely leaves the coating liquid level, the rotation speed is 120 rev / min, and the downward inclination is 20 °.

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination is 60°, the time is 150s, the rotation speed is 10 rev/min; the closing step is to place the insulator in the horizontal direction, the inclination is upward 10°, and the surface drying time is 65 min. The speed is 80 rpm.

Curing time 24h, temperature 20 ° C, humidity 62%.

Test one

The three umbrella insulators are placed in a special dip coating with a solid content of 60%, respectively, using the method of the first embodiment, the artificial air spraying method (the specific operation steps are the same as the spray paint), and the manual dip coating method (specific operation steps) Manually dip the insulator directly into the paint, and then manually remove it and manually brush it (the specific steps are the same as painting). The specific effects are as follows:

As can be seen from the above table, the coating method of the present invention has the advantages of uniform coating thickness, no generation of bubbles, environmental protection, and the like, and has obvious advantages.

Claims

The invention relates to a method for coating an RTV anti-smudge flash coating of an umbrella and a bell-shaped insulator, which comprises the following steps:

(A) cleaning the surface of the insulator, optionally covering the portion of the insulator that does not require coating;

(B) using a coating machine with a rotating function, immersing the insulator in the coating for spin coating;

(C) Curing the coated insulator at ambient temperature and humidity.
The method for coating an umbrella or bell-shaped insulator RTV anti-smudge flash paint according to claim 1, wherein the spin coating comprises at least an insulator immersed in the coating, and a dip step after the insulator leaves the coating surface. The dip coating step is to immerse the insulator partially or completely in the coating material, and the rotation speed is 1 to 50 rpm for 10 to 300 s. The dip step is to rotate the insulator away from the coating liquid surface for 1 to 20 minutes, and the rotation speed is 5 to 150 rpm.
The method for coating an umbrella or bell-shaped insulator RTV anti-smudge flash paint according to claim 1, wherein:

The spin coating step includes a dip coating, a dip coating, a cuffing and a trimming step, wherein the dip, cap and edge steps are performed with the insulator exiting the coating level;

The dip coating step is that the coating device head tilts to immerse the insulator in the paint, and the insulator is inclined downward by 90° to 0°, the rotation speed is 1 to 50 rpm, and the time is 10 to 300 s;

The step of dip is to rotate the insulator after leaving the coating liquid surface for 1 to 20 minutes, the rotation speed is 5 to 150 rpm, and the insulator is inclined downward by 90 to 0;

The closing step is to adjust the insulator of the coating equipment head to rise, the inclination of the vertical line with respect to the horizontal plane is 1° to 90°, the time is 10-200s, and the rotation speed is 5 to 50 rpm;

The edge-receiving step is to place the insulator in a horizontal direction during rotation, the inclination is 30° to 30°, the surface drying time is 45 to 80 minutes, and the rotation speed is 1 to 100 rpm.
The method for coating an umbrella or bell-shaped insulator RTV anti-smudge flash paint according to claim 3, wherein:

In the dip coating step, the insulator has a downward inclination of 50° to 40°, a rotation speed of 5 to 15 rpm, and a time of 50 to 120 s;

The step of dip is to rotate the insulator completely away from the liquid level of the coating for 2 to 5 minutes, the rotation speed is 50 to 90 rpm, and the downward inclination is 50 to 40 degrees;

The closing step has an inclination of 20° to 50°, a time of 30 to 90 s, and a rotation speed of 15 to 20 r.p.m;

The edge-receiving step is to place the coating device head adjusting insulator in a horizontal direction, the inclination is 10° to 10°, the surface drying time is 45 to 80 minutes, and the rotation speed is 10 to 15 rpm.
The method for coating an umbrella or bell-shaped insulator RTV anti-smudge flash paint according to any one of claims 1 to 4, wherein the coating has a solid content of 50 to 100%.
The method according to claim 5, wherein the coating has a solid content of 55 to 80%.
The method for coating an umbrella or bell-shaped insulator RTV anti-smudge flash paint according to any one of claims 1 to 6, wherein the curing is in a ventilated environment at a temperature of 1 to 50 ° C, preferably 18 to 25 ° C. The humidity is carried out at 40 to 85% for 22 to 36 hours.