CN113750867B - Preparation method of polyester-imide insulating varnish - Google Patents
Preparation method of polyester-imide insulating varnish Download PDFInfo
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- CN113750867B CN113750867B CN202111068442.6A CN202111068442A CN113750867B CN 113750867 B CN113750867 B CN 113750867B CN 202111068442 A CN202111068442 A CN 202111068442A CN 113750867 B CN113750867 B CN 113750867B
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- kettle body
- cooling
- polyester
- stirring
- reaction
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- 229920003055 poly(ester-imide) Polymers 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000002966 varnish Substances 0.000 title claims description 26
- 238000001816 cooling Methods 0.000 claims abstract description 75
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 238000003756 stirring Methods 0.000 claims abstract description 55
- 239000003973 paint Substances 0.000 claims abstract description 48
- 238000010790 dilution Methods 0.000 claims abstract description 40
- 239000012895 dilution Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000000498 cooling water Substances 0.000 claims description 12
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 238000007865 diluting Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 8
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 claims description 7
- 229930003836 cresol Natural products 0.000 claims description 7
- 238000005809 transesterification reaction Methods 0.000 claims description 7
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 150000002466 imines Chemical class 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000008096 xylene Substances 0.000 claims description 4
- DMULVCHRPCFFGV-UHFFFAOYSA-N N,N-dimethyltryptamine Chemical compound C1=CC=C2C(CCN(C)C)=CNC2=C1 DMULVCHRPCFFGV-UHFFFAOYSA-N 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
Abstract
The invention relates to the technical field of paint preparation, in particular to a preparation method of a polyester-imide insulating paint, and the method relates to the rapid cooling dilution kettle, which comprises a dilution kettle body, a stirring driving assembly, a water-cooling stirring paddle and a waterway circulation mechanism; the water-cooling stirring paddle comprises a main shaft, a liquid separating rotor and a pipe group assembly; the dilution tank provided by the invention is improved in design, and the stirring structure and the cooling structure are integrated, so that the problems of poor cooling effect and low cooling efficiency existing in the traditional dilution tank when the traditional dilution tank is cooled by simply relying on the tank wall as a heat transfer medium are solved.
Description
Technical Field
The invention relates to the technical field of paint preparation, and particularly provides a preparation method of a polyester-imide insulating paint.
Background
The insulating paint, also called insulating paint, is a paint with outstanding electrical insulation, and has good electrochemical performance, thermal performance, mechanical performance and chemical performance. The insulating paint is a special paint in a plurality of paints, and is an important insulating material based on high molecular polymer and capable of being solidified into an insulating film or an insulating whole body under certain conditions.
The insulating paint generally consists of a binder, a solvent or a diluent and auxiliary materials, and can be divided into five types of impregnating paint, wire enamel, covering paint, silicon steel sheet paint, corona-proof paint and the like according to the application range; according to the paint base material, the paint can be divided into polyester insulating paint, polyester imine insulating paint, vertical insulating paint and the like, wherein the polyester imine insulating paint is one kind of insulating paint with polyester imine as paint base.
In the production and preparation process of the polyester-imide insulating varnish, the paint produced after the imidization reaction in the reaction kettle is subjected to further dilution treatment in the processing process of raw material preparation, transesterification reaction, imidization reaction and paint dilution, so that the diluted paint meets the viscosity requirement of an insulating varnish finished product; the imidization reaction is carried out in a reaction kettle under a heating environment, so that the paint temperature in the diluting kettle is higher, and the paint needs to be cooled in the diluting process, thereby facilitating the storage of a subsequent storage tank. In the prior art, a cooling sleeve is arranged in the dilution kettle so as to cool the dilution kettle by heat exchange through cooling water, but the dilution kettle with the traditional structure only exchanges heat by taking the inner kettle wall as a heat transfer medium, so that the heat transfer effect is poor and the cooling efficiency is poor.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of a polyester imide insulating varnish, which is used for solving the problems in the background art.
In order to achieve the above purpose, the present invention is implemented by adopting the following technical scheme: the preparation method of the polyester-imide insulating varnish specifically comprises the following steps:
s1, preparing various reaction preparation materials required by preparing the polyester-imide insulating varnish according to the proportion of a reaction formula;
s2, adding the reaction preparation materials of ethylene glycol, dimethyl tryptamine and Sike into a reaction kettle according to a proportion, and uniformly heating to 200 ℃ for transesterification;
s3, after the transesterification reaction is completed, cooling the reaction kettle to 160 ℃, equally dividing the materials for preparing the trimellitic anhydride and the dimethylamine into a plurality of parts, continuously adding the first part of materials into the reaction kettle, and uniformly heating to 230 ℃ for imidization reaction;
s4, after the imidization reaction of the first part of material is completed, cooling to 160 ℃, continuously adding the second part of material in the step S3, and repeating the operation of the step S3 until the material adding of a plurality of parts of materials is completed;
s5, sampling test is carried out from the reaction kettle after imidization reaction is completed by step feeding in the step S4, heating is stopped after the test is qualified, then cresol and xylene are added for dissolution, and the dissolved reaction product is discharged into a rapid cooling dilution kettle;
s6, continuously adding cresol, dimethylbenzene, resin and additives into the rapid cooling dilution kettle, diluting by stirring and mixing, and then discharging paint into a storage tank for storage after sampling and detecting that the viscosity and the solid content are qualified;
the preparation method of the polyester-imide insulating varnish by adopting the steps S1-S6 also particularly relates to the rapid cooling dilution kettle in the preparation process of the polyester-imide insulating varnish, which comprises a dilution kettle body, a stirring driving assembly, a water cooling stirring paddle and a waterway circulation mechanism; wherein:
the dilution kettle body comprises an inner kettle body, an outer sleeve sleeved and fixed outside the inner kettle body and a top cover arranged at the top end of the inner kettle body; a water cooling space for injecting cooling water is formed between the inner kettle body and the outer sleeve; the stirring driving assembly is assembled on the top cover, the output end of the stirring driving assembly extends into the inner kettle body, and the water-cooling stirring paddle comprises a main shaft, a liquid separation rotor and a pipe group assembly; the main shaft is positioned in the inner kettle body and is vertically and fixedly connected with the output end of the stirring driving assembly, the liquid separating rotor is coaxially and fixedly connected with the bottom end of the main shaft, the liquid separating rotor is vertically and rotatably arranged between the bottom of the inner kettle body and the bottom of the outer sleeve, the top end of the liquid separating rotor penetrates upwards into the inner kettle body, and the bottom end of the liquid separating rotor penetrates downwards to the outside of the outer sleeve; the pipe group assembly comprises two U-shaped main pipes which are oppositely arranged, one end of each U-shaped main pipe is fixedly connected with the liquid separating rotor, and the other end of each U-shaped main pipe is fixed on the main shaft; a plurality of annular branch pipes are connected between the two U-shaped main pipes in a conducting way, the annular branch pipes are vertically distributed, and a plurality of flower-shaped fins which are uniformly distributed along the annular shape are uniformly sleeved outside the annular branch pipes; the inner cavity of the inner kettle body is communicated with the outside of the outer sleeve through the liquid separating rotor, and the U-shaped main pipe is communicated with the water cooling space through the liquid separating rotor; the waterway circulation mechanism is positioned in the water cooling space and driven by the liquid separation rotor.
Preferably, the liquid separating rotor comprises a disc bin with a cavity structure, a rotary drum and a plurality of tubular columns; the rotary drum vertically rotates between the bottom of the inner kettle body and the bottom of the outer sleeve, a plurality of pipe columns are uniformly distributed around the disc bin and fixedly connected between the disc bin and the rotary drum, the pipe columns are communicated with the disc bin, and a plurality of liquid inlets which are communicated with the pipe columns in a one-to-one correspondence manner are formed in the side wall part of the rotary drum, which is positioned in the cooling space; the U-shaped main pipe is communicated with the disc bin.
Preferably, the waterway circulation mechanism comprises a driving fluted disc and two circulation paddles, wherein the driving fluted disc is coaxially fixed on the rotary drum, and the liquid through hole is positioned above the driving fluted disc; the side wall of the outer sleeve is provided with a liquid inlet and a liquid outlet relatively, the two circulating paddles are vertically and rotatably arranged on the inner end surface of the outer sleeve, and the two circulating paddles are respectively and adjacently arranged at the position of the liquid inlet and the position of the liquid outlet; and a driven gear meshed with the driving fluted disc is arranged on the circulating paddle.
Preferably, the stirring driving assembly comprises a stirring motor fixed at the top end of the top cover and a connecting shaft fixedly connected with an output shaft of the stirring motor, and the connecting shaft is fixedly connected with the top end of the main shaft.
Preferably, a plurality of paddles are uniformly distributed on the circulating paddle around the axial direction.
Preferably, a plurality of annular fins are arranged on the outer side wall of the inner kettle body, which is positioned in the water cooling space, and the annular fins are vertically distributed along the vertical direction.
Preferably, the rotating connection part of the rotating drum and the inner kettle body and the rotating connection part of the rotating drum and the outer sleeve are subjected to waterproof sealing treatment.
Preferably, a feed inlet is arranged at the top end of the top cover.
The technical scheme has the following advantages or beneficial effects: 1. the invention provides a preparation method of polyester-imide insulating varnish, in particular relates to a rapid cooling dilution kettle, which is improved in design, integrates a stirring structure and a cooling structure, and solves the problems of poor cooling effect and low cooling efficiency when the traditional dilution kettle simply relies on a kettle wall as a heat transfer medium for heat exchange cooling.
2. The invention provides a preparation method of polyester-imide insulating paint, in particular to a rapid cooling dilution kettle, which is characterized in that a water cooling pipeline is directly introduced into an inner cavity of an inner kettle body through the design of a water cooling stirring paddle, so that the cooling effect of the dilution kettle on paint is greatly enhanced by deep full cooling contact with the paint while the stirring, diluting and mixing effects are ensured, and the heat exchange and cooling efficiency is improved.
3. The invention provides a preparation method of a polyester-imide insulating varnish, and particularly relates to a rapid cooling dilution kettle, wherein a waterway circulation mechanism is arranged on a water-cooling stirring paddle, and the waterway circulation mechanism is synchronously started to carry out waterway circulation while the water-cooling stirring paddle carries out rotary stirring, so that the introduction and the discharge of cooling water are promoted through the active circulation effect, the flow of the cooling water in the tube cavity of the whole tube group assembly is enhanced, and the heat exchange rate is accelerated.
Drawings
The invention and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout the several views, and are not intended to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a flow chart of a method for preparing a polyester imide insulating varnish.
Fig. 2 is a schematic perspective view of a rapid cooling dilution tank according to the present invention.
Fig. 3 is a schematic perspective view of a cross-sectional structure of a rapid cooling dilution tank according to the present invention.
Fig. 4 is a plan view of a cross-sectional structure of a rapid cooling dilution tank provided by the invention.
Fig. 5 is a schematic perspective view of a water-cooled stirring paddle.
Fig. 6 is a cross-sectional view of a water-cooled paddle.
In the figure: 1. diluting the kettle body; 11. an inner kettle body; 111. annular fins; 12. an outer sleeve; 121. a liquid inlet port; 122. a liquid outlet port; 13. a top cover; 131. a feed port; 2. a stirring drive assembly; 21. a stirring motor; 22. a connecting shaft; 3. water-cooling stirring paddles; 31. a main shaft; 32. a liquid separation rotor; 321. a disc bin; 322. a rotating drum; 3221. a liquid port; 323. a tubular column; 33. a tube set assembly; 331. a U-shaped main pipe; 332. an annular branch pipe; 333. flower-shaped fins; 4. a waterway circulation mechanism; 41. driving the fluted disc; 42. a circulating paddle; 421. a driven gear; 422. a blade.
Detailed Description
The following detailed description of the present invention, given by way of example and not by way of limitation, is set forth in the accompanying drawings to provide a more complete, accurate and thorough understanding of the concepts and aspects of the present invention, and to facilitate its practice.
As shown in fig. 1, the preparation method of the polyester-imide insulating varnish specifically comprises the following steps:
s1, preparing various reaction preparation materials required by preparing the polyester-imide insulating varnish according to the proportion of a reaction formula;
s2, adding the reaction preparation materials of ethylene glycol, dimethyl tryptamine and Sike into a reaction kettle according to a proportion, and uniformly heating to 200 ℃ for transesterification; the reaction kettle can directly use the reaction kettle structure used in the preparation process of the insulating paint in the prior art.
S3, after the transesterification reaction is completed, cooling the reaction kettle to 160 ℃, equally dividing the materials for preparing the trimellitic anhydride and the dimethylamine into a plurality of parts, continuously adding the first part of materials into the reaction kettle, and uniformly heating to 230 ℃ for imidization reaction;
s4, after the imidization reaction of the first part of material is completed, cooling to 160 ℃, continuously adding the second part of material in the step S3, and repeating the operation of the step S3 until the material adding of a plurality of parts of materials is completed;
s5, sampling test is carried out from the reaction kettle after imidization reaction is completed by step feeding in the step S4, heating is stopped after the test is qualified, then cresol and xylene are added for dissolution, and the dissolved reaction product is discharged into a rapid cooling dilution kettle;
s6, continuously adding cresol, dimethylbenzene, resin and additives into the rapid cooling dilution kettle, diluting by stirring and mixing, and then discharging paint into a storage tank for storage after sampling and detecting that the viscosity and the solid content are qualified;
as shown in fig. 2, 3 and 4, the preparation method of the polyesterimide insulating varnish in the steps S1 to S6 is adopted to prepare and process the polyesterimide insulating varnish, and the quick cooling dilution kettle further specifically relates to the quick cooling dilution kettle, which comprises a dilution kettle body 1, a stirring driving assembly 2, a water cooling stirring paddle 3 and a waterway circulation mechanism 4; wherein:
as shown in fig. 2 and 3, the dilution tank body 1 comprises an inner tank body 11, an outer sleeve 12 sleeved and welded outside the inner tank body 11, and a top cover 13 arranged at the top end of the inner tank body 11; a water cooling space for injecting cooling water is formed between the inner kettle body 11 and the outer sleeve 12; the outer side wall of the inner kettle body 11, which is positioned in the water cooling space, is provided with a plurality of annular fins 111, the annular fins 111 are vertically distributed along the vertical direction, and the annular fins 111 increase the thermal contact area between the wall of the inner kettle body 11 and the cooling space, so that the cooling effect is improved; the top end of the top cover 13 is provided with a feed opening 131, and the paint to be diluted and the materials such as cresol, xylene, resin, additives and the like used for dilution can be fed from the feed opening 131.
As shown in fig. 3, the stirring driving assembly 2 is assembled on the top cover 13, and the output end of the stirring driving assembly 2 extends into the inner kettle body 11, and the stirring driving assembly 2 comprises a stirring motor 21 fixed at the top end of the top cover 13 through bolts and a connecting shaft 22 fixedly connected with the output shaft of the stirring motor 21. The stirring motor 21 is started to drive the connecting shaft 22 to rotate, so that the whole water-cooling stirring paddle 3 can be driven to stir for diluting, stirring and mixing the paint.
As shown in fig. 3, 5 and 6, the water-cooled stirring paddle 3 includes a main shaft 31, a liquid separation rotor 32 and a tube group assembly 33; the main shaft 31 is positioned in the inner kettle body 11, the top end of the main shaft 31 is vertically and fixedly connected to the connecting shaft 22 through bolts, the liquid separating rotor 32 is coaxially welded at the bottom end of the main shaft 31, the liquid separating rotor 32 is vertically and rotatably arranged between the bottom of the inner kettle body 11 and the bottom of the outer sleeve 12, the top end of the liquid separating rotor 32 upwards penetrates into the inner kettle body 11, the bottom end of the liquid separating rotor 32 downwards penetrates out of the outer sleeve 12, and the liquid separating rotor 32 comprises a disc bin 321, a rotary drum 322 and a plurality of tubular columns 323 which are of cavity structures; the disc bin 321 is positioned in the inner cavity of the inner kettle body 11 and is welded with the bottom end of the main shaft 31, the rotary drum 322 vertically rotates between the bottom of the inner kettle body 11 and the bottom of the outer sleeve 12, the rotating connection part of the rotary drum 322 and the inner kettle body 11 and the rotating connection part of the rotary drum 12 are subjected to waterproof sealing treatment, four pipe columns 323 are uniformly distributed around the disc bin 321 and are welded between the disc bin 321 and the rotary drum 322, the pipe columns 323 are communicated with the disc bin 321, and four liquid inlets 3221 which are communicated with the four pipe columns 323 in a one-to-one correspondence manner are formed in the side wall part of the rotary drum 322 positioned in the cooling space; the tube group assembly 33 comprises two oppositely arranged U-shaped main tubes 331, one end of each U-shaped main tube 331 is fixedly communicated with the disc bin 321, and the other end of each U-shaped main tube is welded on the main shaft 31; three annular branch pipes 332 are connected between the two U-shaped main pipes 331 in a conducting manner, the three annular branch pipes 332 are vertically distributed, and a plurality of flower-shaped fins 333 which are uniformly distributed along the annular shape are uniformly sleeved outside the annular branch pipes 332; the inner cavity of the inner kettle body 11 is communicated with the outside of the outer sleeve 12 through the liquid separating rotor 32, and the U-shaped main pipe 331 is communicated with the water cooling space through the liquid separating rotor 32; the waterway circulation mechanism 4 is positioned in the water cooling space and is driven by the liquid separating rotor 32.
The separation of the paint circulation path and the cooling waterway is realized through the liquid separating rotor 32 in the water-cooling stirring paddle 3, specifically, the conduction between the inner kettle body 11 and the outer sleeve 12 is realized through the inner circular pipeline of the rotary drum 322, so that the diluted paint can be discharged, a control valve can be assembled in the inner circular pipeline of the rotary drum 322 for controlling the on-off of the paint path, and the pipe group assembly 33 is communicated with the water-cooling space through the communication between the liquid through hole 3221 of the rotary drum 322 and the pipe column 323.
As shown in fig. 3 and 4, the waterway circulation mechanism 4 includes a driving fluted disc 41 and two circulation paddles 42, the driving fluted disc 41 is coaxially fixed on the rotary drum 322, and the liquid through hole 3221 is positioned above the driving fluted disc 41; the side wall of the outer sleeve 12 is provided with a liquid inlet port 121 and a liquid outlet port 122 which are opposite to each other, cooling water is introduced from the position of the liquid inlet port 121, cooling water which is subjected to heat exchange is discharged from the position of the liquid outlet port 122, the positions of the liquid inlet port 121 and the liquid outlet port 122 are communicated with an external existing water-cooling heat exchanger through pipelines to form a circulating water path, two circulating paddles 42 are vertically and rotatably arranged on the inner end surface of the outer sleeve 12, and the two circulating paddles 42 are respectively and adjacently arranged at the position of the liquid inlet port 121 and the position of the liquid outlet port 122; the circulating paddle 42 is provided with a driven gear 421 meshed with the driving fluted disc 41; a plurality of paddles 422 are evenly distributed around the axis on the circulating paddles 42.
The entire circulation waterway, the water cooling space and the entire lumen of the tube set assembly 33 will be filled with cooling water. When the paint to be diluted and the materials used for dilution are subjected to dilution stirring treatment in the dilution kettle, the stirring motor 21 is started to drive the connecting shaft 22 to rotate so as to drive the whole water-cooling stirring paddle 3 to rotate along with the connecting shaft, in the process of rotating, the three annular branch pipes 332 are uniformly distributed in the vertical direction, and each annular branch pipe 332 is uniformly provided with a plurality of flower-shaped fins 333, so that on one hand, the pipe group assembly 33, especially the flower-shaped fins 333, uniformly stir the paint in the inner cavity of the whole inner kettle body 11, promote the homogenization, dilution and mixing of all components in the paint, and on the other hand, the pipe group assembly 33 is fully contacted with the paint while stirring the paint, the contact area between the annular branch pipes 332 and the paint is further increased by the arrangement of the flower-shaped fins 333, and the heat exchange between the paint and the cooling water is actively realized by taking the pipe wall of the pipe group assembly 33 as a thin-wall medium, and the heat exchange between the kettle wall of the inner kettle body 11 and the water cooling space is combined, and the cooling efficiency is greatly improved. The water cooling stirring paddle 3 rotates and stirs, the driving fluted disc 41 is synchronously driven to rotate by the liquid separating rotor 32, the driving fluted disc 41 drives the two circulating paddles 42 to rotate along with the driven gear 421 meshed with the driving fluted disc 41 through driving, and the two circulating paddles 42 are respectively arranged at the position of the liquid inlet port 121 and the position of the liquid outlet port 122 in a close way, so that the suction and the discharge of cooling water can be enhanced, and meanwhile, the rapid flow of the cooling water in the pipe group assembly 33 is promoted, so that the purpose of realizing rapid circulation of a waterway is achieved.
Those skilled in the art will appreciate that the above-described modifications may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and are not described herein. Such modifications do not affect the essence of the present invention, and are not described herein.
The preferred embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, wherein devices and structures not described in detail are to be understood as being implemented in a manner common in the art; any person skilled in the art will make many possible variations and modifications, or adaptations to equivalent embodiments without departing from the technical solution of the present invention, which do not affect the essential content of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. A preparation method of a polyester imine insulating paint is characterized by comprising the following steps: the preparation method specifically comprises the following steps:
s1, preparing various reaction preparation materials required by preparing the polyester-imide insulating varnish according to the proportion of a reaction formula;
s2, adding the reaction preparation materials of ethylene glycol, dimethyl tryptamine and Sike into a reaction kettle according to a proportion, and uniformly heating to 200 ℃ for transesterification;
s3, after the transesterification reaction is completed, cooling the reaction kettle to 160 ℃, equally dividing the materials for preparing the trimellitic anhydride and the dimethylamine into a plurality of parts, continuously adding the first part of materials into the reaction kettle, and uniformly heating to 230 ℃ for imidization reaction;
s4, after the imidization reaction of the first part of material is completed, cooling to 160 ℃, continuously adding the second part of material in the step S3, and repeating the operation of the step S3 until the material adding of a plurality of parts of materials is completed;
s5, sampling test is carried out from the reaction kettle after imidization reaction is completed by step feeding in the step S4, heating is stopped after the test is qualified, then cresol and xylene are added for dissolution, and the dissolved reaction product is discharged into a rapid cooling dilution kettle;
s6, continuously adding cresol, dimethylbenzene, resin and additives into the rapid cooling dilution kettle, diluting by stirring and mixing, and then discharging paint into a storage tank for storage after sampling and detecting that the viscosity and the solid content are qualified;
the preparation method of the polyester-imide insulating varnish by adopting the steps S1-S6 also particularly relates to the rapid cooling dilution kettle in the preparation and processing process of the polyester-imide insulating varnish, and the rapid cooling dilution kettle comprises a dilution kettle body (1), a stirring driving assembly (2), a water-cooling stirring paddle (3) and a waterway circulation mechanism (4); wherein:
the dilution kettle body (1) comprises an inner kettle body (11), an outer sleeve (12) sleeved and fixed outside the inner kettle body (11) and a top cover (13) arranged at the top end of the inner kettle body (11); a water cooling space for injecting cooling water is formed between the inner kettle body (11) and the outer sleeve (12); the stirring driving assembly (2) is assembled on the top cover (13) and the output end of the stirring driving assembly extends into the inner kettle body (11), and the water-cooling stirring paddle (3) comprises a main shaft (31), a liquid separating rotor (32) and a pipe group assembly (33); the main shaft (31) is positioned in the inner kettle body (11) and is vertically and fixedly connected with the output end of the stirring driving assembly (2), the liquid separating rotor (32) is coaxially and fixedly connected with the bottom end of the main shaft (31), the liquid separating rotor (32) is vertically and rotatably arranged between the bottom of the inner kettle body (11) and the bottom of the outer sleeve (12), the top end of the liquid separating rotor (32) upwards penetrates into the inner kettle body (11), and the bottom end of the liquid separating rotor (32) downwards penetrates out of the outer sleeve (12); the tube group assembly (33) comprises two U-shaped main tubes (331) which are oppositely arranged, one end of each U-shaped main tube (331) is fixedly connected with the liquid separating rotor (32), and the other end of each U-shaped main tube is fixed on the main shaft (31); a plurality of annular branch pipes (332) are connected between the two U-shaped main pipes (331) in a conducting way, the annular branch pipes (332) are vertically distributed, and a plurality of flower-shaped fins (333) which are uniformly distributed along the annular shape are uniformly sleeved outside the annular branch pipes (332); the inner cavity of the inner kettle body (11) is communicated with the outside of the outer sleeve (12) through the liquid separating rotor (32), and the U-shaped main pipe (331) is communicated with the water cooling space through the liquid separating rotor (32);
the waterway circulation mechanism (4) is positioned in the water cooling space and driven by the liquid separating rotor (32).
2. The method for preparing the polyester-imide insulating varnish according to claim 1, which is characterized in that: the liquid separating rotor (32) comprises a disc bin (321), a rotary drum (322) and a plurality of tubular columns (323) which are of a cavity structure; the rotary tube (322) is vertically rotated between the bottom of the inner kettle body (11) and the bottom of the outer sleeve (12), a plurality of tube columns (323) are uniformly distributed around the disc bin (321) and fixedly connected between the disc bin (321) and the rotary tube (322), the tube columns (323) are communicated with the disc bin (321), and a plurality of liquid inlets (3221) which are communicated with the tube columns (323) in a one-to-one correspondence manner are formed in the side wall part of the rotary tube (322) in the water cooling space; the U-shaped main pipe (331) is communicated with the disc bin (321).
3. The method for preparing the polyester-imide insulating varnish according to claim 2, which is characterized in that: the waterway circulation mechanism (4) comprises a driving fluted disc (41) and two circulation paddles (42), the driving fluted disc (41) is coaxially fixed on the rotary drum (322), and the liquid through hole (3221) is positioned above the driving fluted disc (41); a liquid inlet port (121) and a liquid outlet port (122) are oppositely arranged on the side wall of the outer sleeve (12), the two circulating paddles (42) are vertically and rotatably arranged on the inner end surface of the outer sleeve (12), and the two circulating paddles (42) are respectively and adjacently arranged at the position of the liquid inlet port (121) and the position of the liquid outlet port (122); the circulating paddle (42) is provided with a driven gear (421) meshed with the driving fluted disc (41).
4. The method for preparing the polyester-imide insulating varnish according to claim 1, which is characterized in that: the stirring driving assembly (2) comprises a stirring motor (21) fixed at the top end of the top cover (13) and a connecting shaft (22) fixedly connected with an output shaft of the stirring motor (21), and the connecting shaft (22) is fixedly connected with the top end of the main shaft (31).
5. A method for preparing a polyesterimide insulating varnish according to claim 3, wherein: a plurality of paddles (422) are uniformly distributed on the circulating paddles (42) around the axial direction.
6. The method for preparing the polyester-imide insulating varnish according to claim 1, which is characterized in that: a plurality of annular fins (111) are arranged on the outer side wall of the inner kettle body (11) which is positioned in the water cooling space, and the annular fins (111) are vertically distributed along the vertical direction.
7. The method for preparing the polyester-imide insulating varnish according to claim 2, which is characterized in that: the rotating connection part of the rotating drum (322) and the inner kettle body (11) and the rotating connection part of the rotating drum and the outer sleeve (12) are subjected to waterproof sealing treatment.
8. The method for preparing the polyester-imide insulating varnish according to claim 1, which is characterized in that: the top end of the top cover (13) is provided with a feeding port (131).
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| CN114539913A (en) * | 2022-01-07 | 2022-05-27 | 珠海格力电工有限公司 | Preparation method of polyester-imide insulating paint and polyester-imide insulating paint |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104130700A (en) * | 2014-07-18 | 2014-11-05 | 上海晟然绝缘材料有限公司 | Preparation method of flexible polyester imide enameled wire insulating paint |
| CN104140757A (en) * | 2014-08-15 | 2014-11-12 | 无锡百川化工股份有限公司 | Method for producing polyester-imine wire coating enamel |
| CN111111594A (en) * | 2020-01-09 | 2020-05-08 | 泉州市嘉鑫信息服务有限公司 | Propylene polymerization kettle |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104130700A (en) * | 2014-07-18 | 2014-11-05 | 上海晟然绝缘材料有限公司 | Preparation method of flexible polyester imide enameled wire insulating paint |
| CN104140757A (en) * | 2014-08-15 | 2014-11-12 | 无锡百川化工股份有限公司 | Method for producing polyester-imine wire coating enamel |
| CN111111594A (en) * | 2020-01-09 | 2020-05-08 | 泉州市嘉鑫信息服务有限公司 | Propylene polymerization kettle |
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