CN115157519A - Integrated forming process for coating tackifying layer on rubber bag of transformer oil conservator - Google Patents
Integrated forming process for coating tackifying layer on rubber bag of transformer oil conservator Download PDFInfo
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- CN115157519A CN115157519A CN202210839928.3A CN202210839928A CN115157519A CN 115157519 A CN115157519 A CN 115157519A CN 202210839928 A CN202210839928 A CN 202210839928A CN 115157519 A CN115157519 A CN 115157519A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/34—Feeding the material to the mould or the compression means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/50—Removing moulded articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention belongs to the technical field of preparation of transformer accessories, and particularly relates to an integrated forming process for coating an adhesion-promoting layer on a rubber bag of a transformer oil conservator. The invention changes the combination structure of the capsule main body adhesive plaster, coats a layer of tackifying glue solution with strong adhesive force between the glue layer and the textile fabric, leads the glue material and the textile fabric of the framework layer to form firm chemical bond combination, ensures that the bad phenomena of capsule wall separation, bubbling, slotting and degumming can not occur in the process of the capsule floating up and down dynamically in an oil tank, prolongs the service life of the capsule, and adopts a novel RE-21-12 automatic hot press machine for integral forming, leads the appearance, the performance and the quality of the capsule to be obviously improved, in particular thoroughly gets rid of the heavy manual forming, gets rid of the poison and the pollution of organic solution, and reaches the requirement of environmental protection.
Description
Technical Field
The invention belongs to the technical field of preparation of transformer accessories, and particularly relates to an integrated forming process for coating an adhesion-promoting layer on a rubber bag of a transformer oil conservator.
Background
The rubber bag and the diaphragm of the transformer oil conservator are the matching products of the transformer,the air bag is contacted with the atmosphere through the breathing tube and the moisture absorber, the air bag is contacted with the transformer oil, the transformer oil is used as an insulating medium in a transformer or a capacitor, and the volume of the transformer oil is changed due to the heat generated during operation or the change of the external temperature. When the temperature is high, the volume of the transformer oil expands, the volume of the oil storage cabinet capsule is reduced to compensate, and when the temperature is reduced, the volume of the transformer oil is reduced, and the volume of the oil storage cabinet capsule is increased to compensate. In particular, the pressure difference in the oil conservator can be flexibly compensated along with the temperature change of the transformer. Effectively isolating the transformer oil from contacting with the air and preventing H in the air 2 O and O 2 The oil surface is invaded, the oil quality deterioration is prevented, the service life of the transformer is prolonged, and the long-term safe operation of the transformer is ensured.
The manufacturing process of the transformer rubber bag is formed by manually pasting and molding adhesive tapes which are formed by pasting high-strength nylon silk double-sided oil-resistant rubber and rolling the adhesive tapes and then vulcanizing the adhesive tapes in a vulcanizing tank at six seventies. Although the use performance of the manufacturing process can meet the technical requirements, with the continuous development of large-scale power transmission and transformation projects, the number of high-capacity and high-parameter transformers is increased, the specification and the model of the capsule are increased day by day, and the requirements on various performances of the capsule are also continuously improved; thus, the technical requirements and manufacturing processes of rubber bladders are still in need of further improvement and enhancement.
Disclosure of Invention
Because the rubber bag of the transformer oil conservator is soaked in the transformer oil for a long time, the bag is contacted with the atmosphere through the breathing tube and the moisture absorber, the heat generated in the operation or the external temperature changes, the volume of the oil changes by expansion and contraction, the capsule in the oil conservator needs to flexibly compensate the pressure difference in the oil conservator along with the change of the oil temperature of the transformer and is in a motion state in the oil conservator; therefore, the capsule wall must have high breaking strength, and more importantly, the adhesive plaster has high adhesive force between the adhesive layer and the textile.
In order to overcome the defects, the invention provides an integrated forming process for coating an adhesion-promoting layer on a rubber bag of a transformer oil conservator. The invention changes the combination structure of the capsule main body adhesive plaster, and coats a layer of tackifying glue solution with strong adhesive force between the glue layer and the textile fabric, so that the glue material and the textile fabric of the framework layer form firm chemical bond combination, thereby ensuring that the bad phenomena of capsule wall separation, bubbling, slotting and degumming can not occur in the process of up-down dynamic floating of the capsule in the oil tank, and prolonging the service life of the capsule. Meanwhile, the novel RE-21-12 automatic hot pressing machine is adopted for integral forming, so that the appearance, the performance and the quality of the capsule are obviously improved, particularly, the heavy manual forming is thoroughly avoided, the toxicity and the pollution of organic solution are thrown away, and the environmental protection requirement is met.
In order to meet the requirements, the technical scheme of the invention is as follows.
A process for integrally forming a rubber bag coating and adhesion promoting layer of a transformer oil conservator specifically comprises the following steps:
step 1, preparation of the tackifying layer glue solution.
Nitrile rubber-40 is used as a main sizing material of the tackifying layer, and the rubber sheet is prepared by the conventional procedure of compounding agent sizing material according to the sizing material formula of the tackifying layer; back-refining the qualified mixed adhesive material of the tackifying layer on an open mill to obtain a film with the thickness of 3-5mm, and cutting the film into pieces with the thickness of 10cm 2 Preparing ethyl acetate solvent for the left and right small blocks; firstly, putting small pieces of rubber materials into a stirrer, then putting 1/3 of the total weight of ethyl acetate into the stirrer, pouring 1/4 of the remaining 2/3 of the ethyl acetate solvent into the stirrer when the rubber sheets begin to be dissolved after swelling, continuously stirring the rubber sheets to the extent of no rubber blocks, finally pouring the remaining ethyl acetate solvent into a tank, uniformly stirring the mixture, and filtering the mixture by using a 100-mesh screen for later use.
And 2, coating tackifying glue solution.
And (3) adopting a horizontal scraper gumming machine to connect the dried 9211 nylon silk to the cloth end for cloth guiding, and coating the single surface for 2 times according to the technological gumming amount.
And 3, drying.
And after the coating is finished, heating and drying the coating by a heating plate, volatilizing the solution in the coating solution, and curling by using a cloth liner.
And 4, double-sided adhesive tape pasting.
Firstly, a curled coating adhesive tape roller is arranged on a roller frame of a calender, gray fabric is prepared, then the roller temperature, the roller spacing and the film thickness are adjusted, main body butyronitrile-26 rubber material is pasted on the calender in a double-sided mode, after the double-sided gluing is finished, clean padding cloth is used for curling, and the padding cloth is placed on a frame to be used for forming capsules.
And 5, integrally forming the capsule.
(1) Setting the temperature of the RE-21-12 hot pressing machine to be 80-85 ℃;
(2) Cutting: the quality of the surface of the calendered double-faced adhesive tape which is parked for 12 hours is checked, the adhesive tape does not allow perforation, fabric fracture, air bubble and cloth exposure, and the checking standard is carried out according to (Q/TT.J3207.18-2018). Cutting the qualified rubberized fabric according to the specification and the model requirement of a drawing, and preparing for forming;
(3) Molding: the lapping width of the capsule main body adhesive tapes is 25 (+/-5) mm, the body-head lapping is 20mm, after the lapping area of the capsule main body adhesive tapes and the inner and outer adhesive tapes are cleaned by ethyl acetate solvent, the novel hot pressing machine station simultaneously adjusts the central line of the pasting part of the capsule to align with the central lines of the upper and lower heating plates, the distortion and dislocation are not allowed, no crease and bubble are generated on the surface, after the capsule is put, the hot pressing machine is immediately started, the hot pressing machine station is provided with an upper heating plate and a lower heating plate, the thickness of the adhesive tape with certain compression deformation and excellent aging resistance and high temperature resistance is 10mm, the hot pressing process condition of the lapping part of the capsule main body adhesive tapes is 80-85 ℃ for 3 minutes, after the hot pressing is combined, the upper heating plate automatically ascends to remove the heating surface, and the capsule is taken out; and (4) carrying out appearance quality inspection on the heated part, and transferring to the next procedure for vulcanization after defects are found and repaired in time to prepare the final product of the rubber bag.
Further, the conventional procedure of compounding ingredient sizing in the step 1 is banburying-mixing-filtering-sheet discharging.
Further, the formula of the sizing material of the adhesion-promoting layer in the step 1 comprises the following components in parts by mass: 100 parts of butyronitrile-40 (producing area: russia), 5-9 parts of ZnO, 1-2 parts of SA, 30-35 parts of spray carbon black, 15-18 parts of dioctyl sebacate, 3-5 parts of an accelerator H, 2 parts of an accelerator TT, 0.2 part of sulfur and 18-20 parts of 2123 phenolic resin (added during stirring).
Further, the mass ratio of the sizing material to the ethyl acetate solvent in the step 1 is 1.
Further, the process parameters of the knife coater in the step 2 are oblique edges with the gap distance between the scraper and the textile fabric of 4-6mm, the temperature is 100-110 ℃, and the roller speed is 10-12 m/min.
Further, the operating conditions of the calender in the step 4 are that the roller temperature is 85-90 ℃, the roller speed is 10 m/min at the temperature of 75-80 ℃ and the roller speed is 50-55 ℃, and the speed ratio is 1. The adhesive plaster has a thickness of 0.85-0.95mm on the first surface and 1.2-1.5mm on the second surface.
Compared with the prior art, the invention has the beneficial effects that.
The key technical point of the invention is that the structure of the capsule adhesive plaster is changed, and the tackifying layer is added, so that the adhesive strength between the capsule framework layer textile fabric and the main adhesive layer and between the adhesive and the main adhesive layer is obviously improved, and the adhesive strength can reach more than 450N/50mm (standard 50N/mm). At present, the adhesive strength is improved, capsules cannot be damaged by separation, fracture, slotting and the like, and the service life of the capsules is effectively prolonged.
Drawings
Figure 1 is a schematic diagram of the structure of the main body rubberized fabric.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Based on the characteristics of the operation of the transformer, in order to enable the rubber capsule to better exert engineering benefits, the main technical key points of the capsule, the formula design of the rubber material, the selection of main body rubber fabric textile, the structural design of the rubber fabric and the manufacturing process technology are adopted.
1. And (3) development of sizing materials and adhesive tapes:
the main rubber material has good oil resistance, ozone resistance, weather resistance and wear resistance. The adhesive tape should have sufficient breaking force, coating layer adhesive strength and lap joint strength. The rubberized fabric should have good softness and reciprocating fatigue performance. The adhesive plaster should have excellent air permeability resistance.
Following the above principle, we develop the key for further improving the breaking force of the adhesive plaster, the bonding strength between the adhesive layer and the textile fabric, and the lap joint strength and the sealing performance of the capsule, namely the formula of the adhesive material of the tackifying layer, the material selection of the textile fabric of the framework layer and the structural design of the adhesive plaster.
(1) Selection of textiles
The skeleton layer material is particularly important for the service performance of the capsule, is a supporting point of the overall strength of the capsule, and has to select high strength and good flexibility, the molecular structure of the fabric fiber contains a polar group, and the fabric fiber can form a well-bonded textile with the main body of butyronitrile-26 glue, in recent years, a plurality of novel synthetic fibers at home and abroad are wide in variety and wide in application, and the following textiles are subjected to a contrast experiment according to the requirements. Polyimide, nylon silk, polyester adhesive layer silk and the like
Table 1 textile properties table.
According to the test data, the 9211 nylon silk is most suitable to be selected as the capsule framework layer material in properties of strength, thickness, density and the like.
(2) Preparation of adhesion-promoting layer sizing material formula
Nitrile rubber, chloroprene rubber, fluorine rubber, chlorohydrin rubber, polyurethane rubber, chlorosulfonated polyethylene rubber and the like are all objects selected from oil-resistant rubber materials in the rubber industry, wherein the nitrile rubber is still the first choice for various oil-resistant adhesive tape products. In order to ensure the adhesive force between the capsule main body rubber (nitrile rubber) and the textile, nitrile-40 with good oil resistance and high affinity with polar polymers is selected as a tackifying rubber material.
The adhesion problem of the nitrile butadiene rubber and the 9211 nylon silk is based on the adhesion interface theory, the adhesion interface state is extremely complex, and the adhesion interface state depends on the chemical property of the surface of the fabric besides the structure of the yarn. According to the chemical structure analysis of textiles, amide groups of the 9211 nylon silk can interact with resorcinol and formaldehyde condensation compounds to form chemical bonds, so that high bonding strength is obtained between rubber and the 9211 nylon silk, and the reaction is as follows:
therefore, according to the theory, in order to solve the problem of adhesion of the nitrile rubber and the 9211 silk, phenolic resin with good heat resistance is selected in the formula for experiments, and the tackifying effect of the phenolic resin 2123 is obvious through experimental screening and positioning.
2123 the phenolic resin is a thermoplastic resin obtained by condensation polymerization of phenol and formaldehyde in an acidic medium. Since the molecules do not contain hydroxymethyl groups and cannot be further condensed to form a body-shaped structure, formaldehyde or a formaldehyde donor such as trichloroformaldehyde, hexamethylenetetramine, paraformaldehyde and the like must be used as a curing agent. Accelerator H (hexamethylene tetramine) is selected as a curing agent, variable proportioning experiments are carried out, and the optimal mixing amount is 3-5 parts.
Table 2 comparison of the properties of 2123 phenolic resin at different addition levels.
2. Forming capsules
The novel process of automatic hot pressing and machine integrated molding of the novel RE-21-12 is adopted, so that the traditional process of heavy manual adhesive coating and manual roller pressing and fitting is replaced.
RE-21-21 new type hot pressing machine, which is to press adhesive tapes up and down to make unvulcanized adhesive tapes to be adhered and formed. The double-sided hot pressing can ensure that the upper and lower adhesive tapes are stressed uniformly, the tightness of the fit between the upper and lower adhesive tapes is improved, and meanwhile, the lap joint between the capsule main body adhesive tapes and the bonded interface of the inner and outer sealant strips are integrated through the double-sided hot pressing. Greatly improving the bonding strength and the air tightness and pressure resistance of the whole capsule.
A process for integrally forming a rubber bag coating and tackifying layer of an oil conservator of a transformer comprises the following steps:
step 1, preparation of the tackifying glue solution.
Using nitrile-butadiene rubber-40 as main sizing material of adhesion-promoting layerConventional procedure for compounding the gum stock preparation of films: banburying, mixing, filtering and sheet discharging; the formula of the tackifying layer sizing material comprises the following components in parts by mass: 100 parts of butyronitrile-40 (producing area: russia), 5-9 parts of ZnO, 1-2 parts of SA, 30-35 parts of spray carbon black, 15-18 parts of dioctyl sebacate, 3-5 parts of accelerator H, 2 parts of accelerator TT, 0.2 part of sulfur and 18-20 parts of 2123 phenolic resin (added during stirring); back-refining the qualified adhesion-promoting layer rubber material on an open mill to obtain a 3-5mm rubber sheet, and cutting into pieces of 10cm 2 Preparing ethyl acetate solvent for the left and right small blocks, wherein the mass ratio of the rubber material to the ethyl acetate solvent is 1; firstly, putting small blocks of rubber materials into a stirrer, then putting 1/3 of the total weight of ethyl acetate into the stirrer, pouring 1/4 of the rest 2/3 of the ethyl acetate solvent into the stirrer when the rubber sheets begin to be dissolved after swelling, continuously stirring the mixture until no rubber blocks exist, finally pouring the rest ethyl acetate solvent into a tank, uniformly stirring the mixture, and filtering the mixture by using a 100-mesh screen for later use.
And step 2, coating tackifying glue solution.
Adopting a horizontal scraper gumming machine to lead the dried 9211 brocade silk cloth at the cloth end, adjusting the inclined edge with the gap distance between the scraper and the textile fabric of 4-6mm width, coating the single surface for 2 times at the temperature of 100-110 ℃ and the roller speed of 10-12 m/min according to the technological gumming amount.
And 3, drying.
And after the coating is finished, heating and drying the coating through a heating plate, volatilizing the solution in the coating solution, and curling the coating solution by using a cloth liner.
And 4, double-sided adhesive tape pasting.
Firstly, placing a curled coated adhesive tape roller on a calender roller frame, preparing gray fabric, adjusting the roller temperature, the roller spacing and the thickness of an adhesive sheet, and starting to paste a main body butyronitrile-26 adhesive material on two sides of a calender; the operating conditions are as follows: the roll speed is 10 m/min at 85-90 ℃ above the roll temperature, 75-80 ℃ in the middle and 50-55 ℃ below the roll temperature, and the speed ratio is 1; the adhesive plaster has a thickness of 0.85-0.95mm on the first surface and 1.2-1.4mm on the second surface; after the double-sided adhesive tape is glued, the double-sided adhesive tape is curled by using a clean cloth liner and placed on a frame for preparing a formed capsule.
And 5, integrally forming the capsule.
(1) Setting the temperature of the RE-21-12 hot pressing machine to be between 80 and 85 ℃;
(2) Cutting: performing quality inspection on the surface of the calendered double-sided attached adhesive tape which is parked for 12 hours, wherein the adhesive tape is not allowed to have the phenomena of perforation, fabric fracture, air bubbles and cloth exposure, the inspection standard is executed according to (Q/TT.J3207.18-2018), and the adhesive tape which is qualified through inspection is cut according to the requirements of drawing specification and model to prepare for molding;
(3) Molding: the lapping width of the capsule main body adhesive tapes is 25 (+/-5) mm, the body-head lapping is 20mm, after the lapping area of the capsule main body adhesive tapes and the inner and outer sealing adhesive tapes are cleaned by a solvent (ethyl acetate), the central line of the capsule pasting part is simultaneously adjusted by a novel hot pressing machine station to align with the central lines of an upper heating plate and a lower heating plate, the distortion and dislocation are not allowed, no crease and air bubble are generated on the surface, after the capsules are placed, the hot pressing machine is immediately started, the hot pressing machine station is provided with the upper heating plate and the lower heating plate, and the adhesive tapes with certain compression deformation, excellent aging resistance and excellent high temperature resistance are paved on the upper heating plate and the lower heating plate, and the thickness of the adhesive tapes is 10mm; the hot pressing process conditions of the lap joint part of the adhesive tape of the capsule main body are 80-85 ℃ for 3 minutes, after hot pressing combination, the upper heating plate automatically rises to remove the heating surface, and the capsule is taken out. And (4) carrying out appearance quality inspection on the heated part, and transferring to the next procedure for vulcanization after defects are found and repaired in time to prepare the final rubber bag.
Example 1.
An integrated molding process for coating an adhesion-promoting layer on a rubber capsule of a transformer oil storage cabinet, wherein the molded capsule has the size phi 1000 x 3000.
(1) The adhesive material of the adhesion promoting layer is prepared according to the following formula by weight: 100 parts of butyronitrile-40, 9 parts of ZnO, 2 parts of SA, 30 parts of spray carbon black, 18 parts of dioctyl sebacate, 3 parts of accelerator H, 2 parts of accelerator TT, 0.2 part of sulfur and 18 parts of 2123 phenolic resin (added during stirring); performing conventional mixing of rubber materials according to the formula, re-mixing the qualified mixed adhesive material of the tackifying layer on an open mill to obtain a rubber sheet with the thickness of 3-5mm, and cutting the rubber sheet into pieces with the thickness of 10cm 2 Preparing ethyl acetate solvent for the left and right small blocks, wherein the mass ratio of the rubber material to the ethyl acetate solvent is 1; firstly, putting small rubber materials into a stirrer, then putting 1/3 of the total weight of ethyl acetate into the stirrer, when the rubber sheet begins to be dissolved after swelling,and then 1/4 of the 2/3 of the weight of the rest ethyl acetate solvent is poured into the kettle and continuously stirred until no glue block exists, and finally the rest ethyl acetate solvent is poured into the kettle and uniformly stirred, and filtered by a 100-mesh screen for standby.
(2) Coating tackifying glue solution, adopting a horizontal scraper glue spreader to connect the dried 9211 silk cloth to the cloth end for cloth guiding, adjusting the inclined edge with the gap distance between the scraper and the textile fabric of 4-6mm width, coating the single surface for 2 times at the temperature of 100-110 ℃ and the roller speed of 10-12 m/min according to the technological gluing amount.
(3) Drying, heating and drying by a heating plate after coating, volatilizing the solution in the coating solution, and curling by using a cloth liner.
(4) And (3) double-sided rubberizing, namely firstly placing a curled coated adhesive tape roller on a calender roller frame, preparing gray fabric, then adjusting the roller temperature, the roller spacing and the thickness of a film, and starting to double-sided rubberizing of the main body butyronitrile-26 rubber material on a calender. The operating conditions are as follows: the roll speed is 10 m/min at 85-90 ℃ above the roll temperature, 75-80 ℃ in the middle and 50-55 ℃ below the roll temperature, and the speed ratio is 1; the thickness of the rubberized fabric is 0.9mm on the first surface and 1.3mm on the second surface; after the double-sided adhesive tape is glued, the double-sided adhesive tape is curled by using a clean cloth liner and placed on a frame for preparing a formed capsule.
(5) Integrally molding the capsule, cutting the dimension phi 1000 x 3000 according to a drawing, and then molding according to the following steps:
(1) Setting the temperature of the RE-21-12 hot pressing machine to be between 80 and 85 ℃;
(2) Cutting: performing quality inspection on the surface of the calendered double-sided attached adhesive tape after being parked for 12 hours, wherein the adhesive tape does not allow the phenomena of perforation, fabric fracture, air bubbles and cloth exposure, the inspection standard is executed according to (Q/TT.J3207.18-2018), and the qualified adhesive tape is cut according to the requirements of drawing specification and model to prepare for forming;
(3) Molding: the lapping width of the capsule main body rubberized fabric is 25mm, and the body-head lapping width is 20mm; after cleaning the lapping area of the capsule main body adhesive tape and the inner and outer sealing adhesive tapes by using a solvent (ethyl acetate), simultaneously adjusting the central line of the pasting part of the capsule to be aligned with the central lines of the upper heating plate and the lower heating plate at a station of a novel hot pressing machine, not allowing distortion and dislocation, not obtaining wrinkles and bubbles on the surface, immediately starting the hot pressing machine after the capsule is placed, wherein the station of the hot pressing machine is provided with an upper heating plate and a lower heating plate, and the upper heating plate and the lower heating plate are paved with adhesive tapes with certain compression deformation and excellent aging resistance and high temperature resistance, and the thickness of the adhesive tapes is 10mm; the hot pressing process conditions of the lap joint part of the capsule main body rubberized fabric are 80-85 ℃ for 3 minutes, after hot pressing combination, the upper heating plate automatically rises to remove the heating surface, and the capsule is taken out. And (4) performing appearance quality inspection on the heating part, and transferring to the next procedure for vulcanization after the defect is found and repaired in time to prepare the final rubber bag.
Example 2.
An integral molding process for coating an adhesion-promoting layer on a rubber capsule of an oil conservator of a transformer, wherein the size of the molded capsule is phi 1000 x 3000.
(1) The adhesive material of the adhesion promoting layer is prepared according to the following formula by weight: 100 parts of butyronitrile-40 parts, 7 parts of ZnO, 1.5 parts of SA, 32 parts of spray carbon black, 16 parts of dioctyl sebacate, 4 parts of accelerator H, 2 parts of accelerator TT, 0.2 part of sulfur and 19 parts of 2123 phenolic resin (added during stirring); performing conventional mixing of rubber materials according to the formula, re-mixing the qualified mixed adhesive material of the tackifying layer on an open mill to obtain a rubber sheet with the thickness of 3-5mm, and cutting the rubber sheet into pieces with the thickness of 10cm 2 Preparing ethyl acetate solvent for the left and right small blocks, wherein the mass ratio of the rubber material to the ethyl acetate solvent is 1; firstly, putting small pieces of rubber materials into a stirrer, then putting 1/3 of the total weight of ethyl acetate into the stirrer, pouring 1/4 of the remaining 2/3 of the ethyl acetate solvent into the stirrer when the rubber sheets begin to be dissolved after swelling, continuously stirring the rubber sheets to the extent of no rubber blocks, finally pouring the remaining ethyl acetate solvent into a tank, uniformly stirring the mixture, and filtering the mixture by using a 100-mesh screen for later use.
(2) Coating tackifying glue solution, adopting a horizontal scraper glue spreader to connect the dried 9211 silk cloth to the cloth end for cloth guiding, adjusting the inclined edge with the gap distance between the scraper and the textile fabric of 4-6mm width, coating the single surface for 2 times at the temperature of 100-110 ℃ and the roller speed of 10-12 m/min according to the technological gluing amount.
(3) Drying, heating and drying by a heating plate after coating, volatilizing the solution in the coating solution, and curling by using a cloth liner.
(4) Double-sided rubberizing, namely firstly placing a curled coated adhesive tape roller on a calender roller frame, preparing gray fabric, then adjusting the roller temperature, the roller spacing and the thickness of a film, and starting to double-sided rubberizing main body butyronitrile-26 sizing material on a calender; the operating conditions are as follows: the roll speed is 10 m/min at 85-90 ℃ above the roll temperature, 75-80 ℃ in the middle and 50-55 ℃ below the roll temperature, and the speed ratio is 1; the thickness of the rubberized fabric is 0.9mm on the first surface and 1.3mm on the second surface; after the double-sided adhesive tape is glued, the double-sided adhesive tape is curled by using a clean cloth liner and is placed on a frame for preparing a formed capsule.
(5) Integrally molding the capsule, cutting the phi 1000 x 3000 according to the drawing, and molding according to the following steps:
(1) Setting the temperature of the RE-21-12 hot pressing machine to be 80-85 ℃;
(2) Cutting: performing quality inspection on the surface of the calendered double-sided attached adhesive tape which is parked for 12 hours, wherein the adhesive tape is not allowed to have the phenomena of perforation, fabric fracture, air bubbles and cloth exposure, the inspection standard is executed according to (Q/TT.J3207.18-2018), and the adhesive tape which is qualified through inspection is cut according to the requirements of drawing specification and model to prepare for molding;
(3) Molding: the lapping width of the capsule main body adhesive tape is 25mm, the body-head lapping is 20mm, after the lapping area of the capsule main body adhesive tape and the inner and outer sealing adhesive tapes are cleaned up by a solvent (ethyl acetate), the central line of the capsule pasting position is simultaneously adjusted to align with the central lines of the upper and lower heating plates by the novel hot pressing machine, the distortion and dislocation are not allowed, no crease and air bubble are generated on the surface, after the capsule is placed, the hot pressing machine is opened at once, the station of the hot pressing machine is provided with an upper heating plate and a lower heating plate, certain compression deformation and excellent aging resistance are realized on the upper and lower heating plates, and the thickness of the rubber plate with high temperature resistance is 10mm. And (3) carrying out hot pressing process conditions of lap joint parts of the rubber fabric of the capsule main body at 80-85 ℃ for 3 minutes, after hot pressing combination, automatically lifting the upper heating plate to remove the heating surface, taking out the capsule, carrying out appearance quality inspection on the heating part, and turning to the next procedure for vulcanization after defects are found to be repaired in time to prepare the final rubber capsule.
Example 3.
An integral molding process for coating an adhesion-promoting layer on a rubber capsule of an oil conservator of a transformer, wherein the size of the molded capsule is phi 1000 x 3000.
(1) The adhesive material of the adhesion promoting layer is prepared according to the following formula by weight: nitrile butadiene40 parts of-40 parts, 5 parts of ZnO, 1 part of SA, 34 parts of spray carbon black, 15 parts of dioctyl sebacate, 5 parts of accelerator H, 2 parts of accelerator TT, 0.2 part of sulfur and 20 parts of 2123 phenolic resin (added during stirring); according to the formula, the rubber material is mixed conventionally, the qualified mixed adhesion-promoting layer rubber material is back-mixed on an open mill to obtain a rubber sheet with the thickness of 3-5mm, and the rubber sheet is cut into pieces with the thickness of 10cm 2 Preparing ethyl acetate solvent for the left and right small blocks, wherein the mass ratio of the rubber material to the ethyl acetate solvent is 1; firstly, putting small blocks of rubber materials into a stirrer, then putting 1/3 of the total weight of ethyl acetate into the stirrer, pouring 1/4 of the rest 2/3 of the ethyl acetate solvent into the stirrer when the rubber sheets begin to be dissolved after swelling, continuously stirring the mixture until no rubber blocks exist, finally pouring the rest ethyl acetate solvent into a tank, uniformly stirring the mixture, and filtering the mixture by using a 100-mesh screen for later use.
(2) Coating tackifying glue solution, adopting a horizontal scraper glue spreader to connect the dried 9211 silk cloth to the cloth end for cloth guiding, adjusting the inclined edge with the gap distance between the scraper and the textile fabric of 4-6mm width, coating the single surface for 2 times at the temperature of 100-110 ℃ and the roller speed of 10-12 m/min according to the technological gluing amount.
(3) Drying, heating and drying by a heating plate after coating, volatilizing the solution in the coating solution, and curling by using a cloth liner.
(4) And (3) double-sided rubberizing, namely firstly placing a curled coated adhesive tape roller on a calender roller frame, preparing gray fabric, then adjusting the roller temperature, the roller spacing and the thickness of a film, and starting to double-sided rubberizing of the main body butyronitrile-26 rubber material on a calender. The operating conditions are as follows: the roll speed is 10 m/min at 85-90 ℃ above the roll temperature, 75-80 ℃ in the middle and 50-55 ℃ below the roll temperature, and the speed ratio is 1; the adhesive plaster thickness is 0.9mm on the first surface and 1.3mm on the second surface; after the double-sided adhesive tape is glued, the double-sided adhesive tape is curled by using a clean cloth liner and is placed on a frame for preparing a formed capsule.
(5) Integrally molding the capsule, cutting the phi 1000 x 3000 according to the drawing, and molding according to the following steps:
(1) Setting the temperature of the RE-21-12 hot pressing machine to be between 80 and 85 ℃;
(2) Cutting: performing quality inspection on the surface of the calendered double-sided attached adhesive tape after being parked for 12 hours, wherein the adhesive tape does not allow the phenomena of perforation, fabric fracture, air bubbles and cloth exposure, the inspection standard is executed according to (Q/TT.J3207.18-2018), and the qualified adhesive tape is cut according to the requirements of drawing specification and model to prepare for forming;
(3) Molding: the lapping width of the capsule main body rubberized fabric is 25mm, and the body-head lapping width is 20mm; after a bonding surface of a lap joint area of a capsule main body adhesive tape and inner and outer sealing adhesive tapes is cleaned up by a solvent (ethyl acetate), a novel hot pressing machine station simultaneously adjusts the central line of a capsule bonding part to be aligned with the central lines of an upper heating plate and a lower heating plate, distortion and dislocation are not allowed, no crease and air bubbles are generated on the surface, after the capsule is placed, a hot pressing machine is immediately started, the hot pressing machine station is provided with an upper heating plate and a lower heating plate, and the thickness of the adhesive tape with certain compression deformation and excellent aging resistance and high temperature resistance is 10mm by paving the upper heating plate and the lower heating plate; hot pressing at the lap joint of the main body of the capsule and the adhesive tape for 3 minutes at 80-85 ℃, automatically lifting the upper heating plate to remove the heating surface after hot pressing and combination, and taking out the capsule; and (4) carrying out appearance quality inspection on the heated part, and transferring to the next procedure for vulcanization after defects are found and repaired in time to prepare the final rubber bag.
The technical effects obtained by adopting the technical schemes of the embodiments 1 to 3 are as follows:
table 3 the examples are compared with the results of the general capsule performance test.
Claims (6)
1. A process for integrally forming a rubber bag coating and tackifying layer of an oil conservator of a transformer comprises the following steps:
step 1, preparation of tackifying layer glue solution
Nitrile rubber-40 is used as a main sizing material of the tackifying layer, and the rubber sheet is prepared by the conventional procedure of compounding agent sizing material according to the sizing material formula of the tackifying layer; back-refining the qualified mixed adhesive material of the tackifying layer on an open mill to obtain a film with the thickness of 3-5mm, and cutting the film into pieces with the thickness of 10cm 2 Preparing ethyl acetate solvent for the left and right small blocks; firstly, putting small rubber materials into a stirrer, and then putting 1/3 of the total weight of ethyl acetate into the stirrer for stirringIn the machine, when the film is swelled and begins to be dissolved, pouring 1/4 of 2/3 of the weight of the rest ethyl acetate solvent, continuously stirring until no film block exists, finally pouring the rest ethyl acetate solvent into the tank, uniformly stirring, and filtering by a 100-mesh screen for later use;
step 2, coating tackifying glue solution
Adopting a horizontal scraper gumming machine to connect the dried 9211 brocade silk at the cloth end for cloth guiding, and coating the single surface for 2 times according to the technological gumming amount;
step 3, drying
Heating and drying the coating solution by a heating plate after coating, volatilizing the solution in the coating solution, and curling by using a cloth liner;
step 4, double-sided adhesive tape pasting
Firstly, placing a curled coating adhesive tape roller on a calender roller frame, preparing grey cloth, then adjusting the roller temperature, the roller spacing and the film thickness, starting to carry out double-sided application of main body butyronitrile-26 rubber on a calender, curling by using clean padding cloth after the double-sided application of the adhesive is finished, and placing the padding cloth on a frame for preparing a formed capsule;
step 5, integrally forming the capsule
(1) Setting the temperature of the RE-21-12 hot pressing machine to be 80-85 ℃;
(2) Cutting: performing quality inspection on the surface of the calendered double-sided attached adhesive tape after being parked for 12 hours, wherein the adhesive tape does not allow the phenomena of perforation, fabric fracture, air bubbles and cloth exposure, performing inspection standard according to Q/TT.J3207.18-2018, and cutting the qualified adhesive tape according to the specification and the model requirement of a drawing to prepare for forming;
(3) Molding: the lapping width of the capsule main body adhesive plaster is 25 (+/-5) mm, the body-head lapping is 20mm, after the lapping area of the capsule main body adhesive plaster and the inner and outer sealant strips are cleaned by ethyl acetate solvent, the central line of the capsule pasting part is simultaneously adjusted by a novel hot pressing machine station to align with the central lines of an upper heating plate and a lower heating plate, the distortion and dislocation are not allowed, no crease and air bubble are generated on the surface, after the capsule is placed, a hot pressing machine is immediately started, the hot pressing machine station is provided with an upper heating plate and a lower heating plate, the thickness of the adhesive plate with certain compression deformation and excellent aging resistance and high temperature resistance is 10mm is paved on the upper heating plate and the lower heating plate, the hot pressing process condition of the lapping part of the capsule main body adhesive plaster is 80-85 ℃ for 3 minutes, after the hot pressing combination, the upper heating plate automatically ascends to remove the heating surface, and the capsule is taken out; and (4) carrying out appearance quality inspection on the heated part, and transferring to the next procedure for vulcanization after defects are found and repaired in time to prepare the final product of the rubber bag.
2. The process for integrally forming the rubber bag coated with the adhesion-promoting layer of the transformer oil conservator as claimed in claim 1, wherein the conventional procedure of compounding the ingredient rubber in step 1 is banburying, mixing, filtering and sheet forming.
3. The process for integrally forming the adhesion-promoting layer coated on the rubber bag of the transformer oil conservator as claimed in claim 1, wherein the formula of the adhesion-promoting layer rubber material in the step 1 comprises the following components in parts by mass: 100 parts of butyronitrile-40 parts, 5-9 parts of ZnO, 1-2 parts of SA, 30-35 parts of spray carbon black, 15-18 parts of dioctyl sebacate, 3-5 parts of an accelerator H, 2 parts of an accelerator TT and 0.2 part of sulfur, and 18-20 parts of 2123 phenolic resin is added during stirring.
4. The process for integrally forming the adhesion-promoting layer coated on the rubber bag of the transformer oil conservator according to claim 1, wherein the mass ratio of the sizing material to the ethyl acetate solvent in the step 1 is 1.
5. The process for integrally forming the rubber bag coating and tackifying layer of the transformer oil conservator according to claim 1, wherein the process parameters of the knife coater in the step 2 are the gap distance between the scraper and the textile fabric is an inclined edge with the width of 4-6mm, the temperature is 100-110 ℃, and the roller speed is 10-12 m/min.
6. The process for integrally forming the rubber bag coating and tackifying layer of the transformer oil conservator according to claim 1, wherein the operating conditions of the calender in the step 4 are that the roller temperature is 85-90 ℃, the roller speed is 10 m/min at the temperature of 75-80 ℃ and the temperature of 50-55 ℃, and the speed ratio is 1; the adhesive plaster has a thickness of 0.85-0.95mm on the first surface and 1.2-1.5mm on the second surface.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338370A (en) * | 1980-04-07 | 1982-07-06 | Goodyear Aerospace Corporation | Chemically resistant coated fabric |
| CN102486011A (en) * | 2010-12-03 | 2012-06-06 | 沈阳洪达橡塑总厂 | Low temperature rubber capsule used in oil conservator for transformer and preparation process |
| CN103158271A (en) * | 2011-12-14 | 2013-06-19 | 常熟市新华化工有限公司 | Production method of transformer oil storage capsule |
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2022
- 2022-07-18 CN CN202210839928.3A patent/CN115157519B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4338370A (en) * | 1980-04-07 | 1982-07-06 | Goodyear Aerospace Corporation | Chemically resistant coated fabric |
| CN102486011A (en) * | 2010-12-03 | 2012-06-06 | 沈阳洪达橡塑总厂 | Low temperature rubber capsule used in oil conservator for transformer and preparation process |
| CN103158271A (en) * | 2011-12-14 | 2013-06-19 | 常熟市新华化工有限公司 | Production method of transformer oil storage capsule |
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