Process for processing heat-resistant polyester insulating paint of enameled wire

Abstract

The present application belongs to the field of enameled wire heat-resistant polyester paint processing, in particular to a heat-resistant polyester insulating paint processing technology for enameled wire, which aims at the problem that the existing polyester insulating paint uses sik as the main raw material, which increases the production cost of the insulating resin production factory, is not conducive to the better and faster development of the insulating resin industry, and allows the illegal monopoly factory to continue to raise prices, endangering the development of the entire industry. The present application proposes the following scheme, which comprises the following steps: S1: preparing materials; S2: reactor temperature rising and dissolving part of raw materials; S3: mixing and stirring; S4: detecting the acid value of the mixed material obtained in S3; S5: continuously heating to carry out vacuum polycondensation reaction of the vacuum mixed material; the present application uses cyanuric acid with more extensive sources and lower cost to replace sik as the main raw material for producing heat-resistant polyester insulating paint, which not only reduces the production cost, but also breaks the monopoly of sik factory, and is conducive to ensuring the better and faster development of the insulating resin industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat-resistant polyester varnish for enameled wire, and particularly relates to a heat-resistant polyester insulation varnish processing technology for enameled wire. BACKGROUND

[0002] The polyester insulation varnish for enameled wire is a paint, which can protect the metal in the enameled wire from the influence of arc, corona and electric corrosion, etc. The existing technology uses sikke (trihydroxyethyl isocyanurate) to improve the heat resistance of polyester. The triazine ring mechanism is introduced by the reaction of trihydroxyethyl of sikke with dibasic acid. Sikke reacts with terephthalic acid or dimethyl ester at a high temperature (about 180 DEG C or above) to remove water molecules to form a polyester structure. Finally, solvents, cross-linking agents, leveling agents and the like are added to become a heat-resistant polyester product suitable for enameled wire.

[0003] In the past two years, the reduction of sikke suppliers and the reshuffle of the industry have led to the gradual monopoly of manufacturers, and the price has risen sharply from 12 yuan / kg to a maximum of 26 yuan / kg. The cost pressure of the insulation resin production factory has also risen sharply, and the non-standard competition in the market has endangered the healthy development of the industry.

[0004] Therefore, the use of sikke as the main material of the polyester insulation varnish will have the following obvious problems:

[0005] 1. It will increase the production cost of the insulation resin production factory, which is not conducive to the better and faster development of the insulation resin industry;

[0006] 2. It will allow illegal monopoly manufacturers to continue to raise prices, endangering the development of the entire industry;

[0007] Therefore, a heat-resistant polyester insulation varnish processing technology for enameled wire is needed to solve the above problems. SUMMARY

[0008] The heat-resistant polyester insulation varnish processing technology for enameled wire provided by the present application solves the problems that the existing polyester insulation varnish uses sikke as the main raw material, which increases the production cost of the insulation resin production factory, is not conducive to the better and faster development of the insulation resin industry, and allows illegal monopoly manufacturers to continue to raise prices, endangering the development of the entire industry.

[0009] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0010] A heat-resistant polyester insulation varnish processing technology for enameled wire, comprising the following steps:

[0011] S1: prepare materials, by mass fraction, dimethyl terephthalate 140-150 parts, cyanuric acid 50-60 parts, crosslinking agent 10-18 parts, phenolphthalein 10-15 parts, catalyst 2-8 parts, solvent oil 130-150 parts, ethylene glycol 56-90 parts, cyclohexane dimethanol 44-58 parts and leveling agent 10-15 parts;

[0012] S2: reactor temperature dissolves part of the raw materials, add equal proportion of dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol to the reactor, the reactor is heated to obtain the dissolved intermediate product;

[0013] S3: mixing and stirring, the intermediate product is mixed and stirred under the condition of catalyst by using the stirring mechanism on the reactor, to obtain the mixed material;

[0014] S4: detect the acid value of the mixed material obtained in S3, control the acid value of the mixed material in the range below 6mgKOH / g;

[0015] S5: continue to heat and carry out vacuum polycondensation reaction of the mixed material, the vacuum degree during the vacuum polycondensation reaction needs to be higher than-0.09MPa;

[0016] S6: observe the viscosity of the mixed material, with the continuous stirring process, judge the viscosity of the mixed material according to the naked eye;

[0017] S7: sample the mixed material and test the viscosity, stop the polycondensation operation when the specified viscosity is reached;

[0018] S8: prepare heat-resistant polyester solvent, add solvent oil, crosslinking agent and leveling agent to the mixed material with viscosity up to standard to obtain heat-resistant polyester solvent;

[0019] S9: use polyester solvent to prepare heat-resistant polyester insulating paint;

[0020] S10: filter and package the heat-resistant polyester insulating paint, filter the heat-resistant polyester insulating paint prepared up to standard by using filter cartridge and then barrel pack.

[0021] Preferably, in S1, the required dimethyl terephthalate, cyanuric acid, crosslinking agent, phenolphthalein, catalyst, solvent oil, ethylene glycol, cyclohexane dimethanol and leveling agent are weighed by weighing equipment, and the weighing equipment is selected as electronic balance, so that the proportion of raw materials can be ensured accurate.

[0022] Preferably, in S2, the dissolving temperature is 100-150℃, and the dissolving time is 10-15min, until dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol are completely dissolved.

[0023] Preferably, in the S3, the reactor is a temperature-controlled stirred reaction kettle, the stirring speed is between 160r / min and 200r / min, the stirring temperature is 170-225℃, the stirring time is 5-20min, water vapor is continuously discharged, and the practical catalyst is a weak base containing nitrogen heterocyclic compounds.

[0024] Preferably, in the S4, the dried lithium carbonate is placed in a mixer and methanol is added, in the S4, the acid value is detected by using a ZFSZ100 full-automatic acid value tester, a plurality of sampling data are detected during the acid value detection, the overall acid value is ensured to reach a specified value, and the detection result is more reliable.

[0025] Preferably, in the S5, the temperature range of the vacuum polycondensation reaction is 220-240, and the vacuum degree gradually increases according to the condition of the reactor.

[0026] Preferably, in the S6, as the vacuum polycondensation reaction continuously proceeds, the viscosity of the mixed material continuously increases under naked eyes, and the next operation is performed when the viscosity of the mixed material obviously increases.

[0027] Preferably, in the S7, the viscosity test is performed by using an HYYND-H kinematic viscosity tester, and the specified viscosity is an industry standard.

[0028] Preferably, in the S8, the stirring speed is adjusted to 60r / min-80r / min, and the heat-resistant polyester solvent is obtained after sufficient and uniform dissolution, in the S9, the prepared heat-resistant polyester insulating paint is tested, and the physical and chemical indexes of the heat-resistant polyester insulating paint are as follows: viscosity (30℃, 35s), brown red transparent liquid appearance, and solid content 33%.

[0029] Preferably, in the S10, three filter screens are sequentially arranged in the filter cartridge from top to bottom, and the three filter screens are a first fiber filter screen, a second fiber filter screen and a copper screen, large solid particles are removed by filtration, and the quality of the barrel is 30kg.

[0030] Compared with the prior art, the beneficial effects of the present application are as follows:

[0031] 1. By using cyanuric acid as the main raw material to replace secco, which has a wider source and lower cost, the production cost of heat-resistant polyester insulating paint can be reduced, the monopoly of secco manufacturers can be broken, and the stability of the insulating resin market is ensured;

[0032] 2. By adding cyclohexane dimethyl alcohol, the thermal shock performance of the heat-resistant polyester insulating paint can be effectively improved, and the use performance of the heat-resistant polyester insulating paint is further improved.

[0033] 3. By using weak base containing nitrogen heterocyclic as catalyst, cyanuric acid can react with phenolphthalein and dimethyl terephthalate at high temperature to form polyester with triazine ring structure, thereby greatly improving the heat resistance of the product.

[0034] The application uses cyanuric acid as main raw material to produce heat-resistant polyester insulating paint, which is more widely sourced and less expensive than siccative, thereby reducing production cost, breaking the monopoly of siccative manufacturers, and being conducive to better and faster development of the insulating resin industry. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A flow chart of a heat-resistant polyester insulating paint processing process for enameled wire is provided. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the application, not all.

[0037] REFERENCE Figure 1 A heat-resistant polyester insulating paint processing process for enameled wire includes the following steps:

[0038] S1: Prepare materials, and add dimethyl terephthalate 140 parts, cyanuric acid 50 parts, crosslinking agent 10 parts, phenolphthalein 10 parts, catalyst 2 parts, solvent oil 130 parts, ethylene glycol 56 parts, cyclohexane dimethanol 44 parts, and leveling agent 10 parts according to mass fraction;

[0039] S2: Dissolve part of the raw materials in the reactor, and add equal proportions of dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol, and cyclohexane dimethanol into the reactor. After the reactor is heated, the dissolved intermediate product is obtained;

[0040] S3: Mix and stir the intermediate product under the condition of the catalyst by using the stirring mechanism on the reactor to obtain a mixed material;

[0041] S4: Detect the acid value of the mixed material obtained in S3, and control the acid value of the mixed material in the range below 6 mgKOH / g;

[0042] S5: Continuously heat and perform vacuum polycondensation reaction of the mixed material, and the vacuum degree during the vacuum polycondensation reaction needs to be higher than -0.09 MPa;

[0043] S6: Observe the viscosity of the mixed material, and judge the viscosity of the mixed material according to the naked eye according to the continuous stirring process;

[0044] S7: Sample the mixed material and test the viscosity, and stop the polycondensation operation when the specified viscosity is reached;

[0045] S8: preparing heat-resistant polyester solvent, adding solvent oil, crosslinking agent and leveling agent in turn to the mixed substance with viscosity up to standard to obtain heat-resistant polyester solvent;

[0046] S9: preparing heat-resistant polyester insulating paint by using polyester solvent;

[0047] S10: filtering and packaging the heat-resistant polyester insulating paint, and the prepared heat-resistant polyester insulating paint is filtered by filter cartridge and then is barreled.

[0048] In the embodiment, in S1, the required dimethyl terephthalate, cyanuric acid, crosslinking agent, phenolphthalein, catalyst, solvent oil, ethylene glycol, cyclohexane dimethanol and leveling agent are weighed by weighing equipment, and the weighing equipment is selected as electronic balance, so that the proportion of raw materials can be ensured to be accurate.

[0049] In the embodiment, in S2, the dissolving temperature is 100°C, and the dissolving time is 10, until the dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol are completely dissolved.

[0050] In the embodiment, in S3, the reactor is a stirring reaction kettle with temperature control, the stirring speed is 160 r / min, the stirring temperature is 170°C, the stirring time is 5 min, and water vapor is continuously discharged, and the practical catalyst is a weak base containing nitrogen heterocyclic.

[0051] In the embodiment, in S4, the acid value detection is performed by using a ZFSZ100 full-automatic acid value detector, and a plurality of sampling data are detected to ensure that the overall acid value reaches the specified value, and the detection result is more reliable.

[0052] In the embodiment, in S5, the temperature range of vacuum polycondensation reaction is between 220°C, and the vacuum degree gradually increases according to the condition of the reactor.

[0053] In the embodiment, in S6, as the vacuum polycondensation reaction continuously proceeds, the viscosity of the mixed substance continuously increases under naked eye, and when the viscosity of the mixed substance obviously increases, the next operation is performed.

[0054] In the embodiment, in S7, the viscosity test is performed by using an HYYND-H kinematic viscosity tester, and the specified viscosity is the industry standard.

[0055] In the embodiment, in S8, the stirring speed is adjusted to 60 r / min, and the heat-resistant polyester solvent is obtained after sufficient and uniform dissolution, and in S9, the prepared heat-resistant polyester insulating paint is tested, and the physical and chemical indexes of the heat-resistant polyester insulating paint are as follows: viscosity (30°C, 35 s), appearance is brown red transparent liquid and solid content is 33%.

[0056] In this embodiment, in S10, three filter screens are sequentially arranged in the filter cartridge from top to bottom, which are a first fiber filter screen, a second fiber filter screen and a copper screen, and large solid particles are removed by filtration, and the mass of the barrel is 30 kg.

[0057] Example Two

[0058] Different from example one is:

[0059] Referring to Figure 1 A processing process of heat-resistant polyester insulating paint for enameled wire, comprising the following steps:

[0060] S1: preparing materials, according to mass fraction, dimethyl terephthalate 145 parts, cyanuric acid 55 parts, crosslinking agent 14 parts, phenolphthalein 12 parts, catalyst 5 parts, solvent oil 140 parts, ethylene glycol 77 parts, cyclohexane dimethanol 50 parts and leveling agent 13 parts;

[0061] S2: heating and dissolving part of raw materials in the reactor, adding equal proportions of dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol into the reactor, and obtaining the dissolved intermediate product after heating the reactor;

[0062] S3: mixing and stirring, using the stirring mechanism on the reactor to mix the intermediate product under the condition of the catalyst to obtain the mixed material;

[0063] S4: detecting the acid value of the mixed material obtained in S3, and controlling the acid value of the mixed material in the range below 6mgKOH / g;

[0064] S5: continuously heating to carry out vacuum polycondensation reaction of the vacuum mixed material, and the vacuum degree during the vacuum polycondensation reaction needs to be higher than -0.09MPa;

[0065] S6: observing the viscosity of the mixed material, and judging the viscosity of the mixed material according to the naked eye along with the continuous stirring process;

[0066] S7: sampling the mixed material to test the viscosity, and stopping the polycondensation operation when the specified viscosity is reached;

[0067] S8: preparing heat-resistant polyester solvent, and adding solvent oil, crosslinking agent and leveling agent into the mixed material with qualified viscosity to obtain heat-resistant polyester solvent;

[0068] S9: using the polyester solvent to prepare heat-resistant polyester insulating paint;

[0069] S10: filtering and packaging the heat-resistant polyester insulating paint, and using the filter cartridge to filter the prepared heat-resistant polyester insulating paint after reaching the standard, and then barrel packaging.

[0070] In this embodiment, in S1, the required grams of dimethyl terephthalate, cyanuric acid, crosslinking agent, phenolphthalein, catalyst, solvent oil, ethylene glycol, cyclohexane dimethanol and leveling agent are weighed by a weighing device, and the weighing device is selected as an electronic balance. Thus, the proportion of raw materials can be ensured to be accurate.

[0071] In this embodiment, in S2, the dissolution temperature is 120℃, and the dissolution time is 13min, until dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol are completely dissolved.

[0072] In this embodiment, in S3, the reactor is a stirring reaction kettle with temperature control, the stirring speed is 180r / min, the stirring temperature is 195℃, and the stirring time is 12min. Water vapor is continuously discharged, and the practical catalyst is a weak base containing nitrogen heterocyclic compounds.

[0073] In this embodiment, in S4, the acid value detection is performed by using a ZFSZ100 type full-automatic acid value detector. When detecting the acid value, a plurality of sampling data need to be detected to ensure that the overall acid value reaches the specified value, and the detection result is more reliable.

[0074] In this embodiment, in S5, the temperature range of vacuum polycondensation reaction is 230℃, and the vacuum degree gradually increases according to the condition of the reactor.

[0075] In this embodiment, in S6, as the vacuum polycondensation reaction continuously proceeds, the viscosity of the mixed material continuously increases under the naked eye. When the viscosity of the mixed material obviously increases, the next operation is performed.

[0076] In this embodiment, in S7, the viscosity test is performed by using a HYYND-H kinematic viscosity tester, and the specified viscosity is the industry standard.

[0077] In this embodiment, in S8, the stirring speed is adjusted to 70r / min, and after fully and uniformly dissolving, a heat-resistant polyester solvent is obtained. In S9, the prepared heat-resistant polyester insulating paint is tested, and the physical and chemical indexes of the heat-resistant polyester insulating paint are as follows: viscosity (30℃, 35s), appearance is brown red transparent liquid, and solid content is 33%.

[0078] In this embodiment, in S10, three filter screens are sequentially arranged in the filter cartridge from top to bottom, which are a first fiber filter screen, a second fiber filter screen and a copper screen. The larger solid particles are removed by filtration, and the quality of the barrel is 30kg.

[0079] Example Three

[0080] Different from example one is:

[0081] Reference Figure 1 A processing technology of heat-resistant polyester insulating paint for enameled wire, comprising the following steps:

[0082] S1: Prepare materials, by mass fraction, dimethyl terephthalate 140-150 parts, cyanuric acid 60 parts, crosslinking agent 18 parts, phenolphthalein 15 parts, catalyst 8 parts, solvent oil 150 parts, ethylene glycol 90 parts, cyclohexane dimethanol 58 parts and leveling agent 15 parts;

[0083] S2: Dissolve part of the raw materials in the reactor, add equal proportions of dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol to the reactor, and obtain the dissolved intermediate product after the reactor is heated;

[0084] S3: Mix and stir, use the stirring mechanism on the reactor to mix and stir the intermediate product under the condition of the catalyst to obtain a mixed material;

[0085] S4: Detect the acid value of the mixed material obtained in S3, and control the acid value of the mixed material to be below 6 mgKOH / g;

[0086] S5: Continue to heat and perform vacuum polycondensation reaction of the mixed material, the vacuum degree during the vacuum polycondensation reaction needs to be higher than -0.09 MPa;

[0087] S6: Observe the viscosity of the mixed material, and judge the viscosity of the mixed material according to the naked eye as the stirring process continues;

[0088] S7: Sample the mixed material and test the viscosity, and stop the polycondensation operation when the specified viscosity is reached;

[0089] S8: Prepare a heat-resistant polyester solvent, and add solvent oil, crosslinking agent and leveling agent to the mixed material with viscosity up to standard to obtain a heat-resistant polyester solvent;

[0090] S9: Use the polyester solvent to prepare a heat-resistant polyester insulating paint;

[0091] S10: Filter and package the heat-resistant polyester insulating paint, and filter the heat-resistant polyester insulating paint after preparation with a filter cartridge and then barrel pack.

[0092] In this embodiment, in S1, the required dimethyl terephthalate, cyanuric acid, crosslinking agent, phenolphthalein, catalyst, solvent oil, ethylene glycol, cyclohexane dimethanol and leveling agent are weighed by a weighing device, and an electronic balance is selected as the weighing device, so that the proportion of the raw materials can be accurately ensured.

[0093] In this embodiment, in S2, the dissolution temperature is 150°C, and the dissolution time is 15 min, until the dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethanol are completely dissolved.

[0094] In this embodiment, in S3, the reactor is a temperature-controlled stirred reactor, the stirring speed is 200 r / min, the stirring temperature is 225℃, the stirring time is 20 min, water vapor is continuously discharged, and the practical catalyst is a weak base containing a nitrogen-containing heterocyclic compound.

[0095] In this embodiment, in S4, the acid value is detected by using a ZFSZ100 full-automatic acid value tester, a plurality of sampling data are detected to ensure that the overall acid value reaches the specified value, and the detection result is more reliable.

[0096] In this embodiment, in S5, the temperature range of the vacuum polycondensation reaction is 240℃, and the vacuum degree is gradually increased according to the condition of the reactor.

[0097] In this embodiment, in S6, as the vacuum polycondensation reaction continuously proceeds, the viscosity of the mixed material continuously increases under the naked eye, and when the viscosity of the mixed material obviously increases, the next operation is performed.

[0098] In this embodiment, in S7, the viscosity is tested by using an HYYND-H kinematic viscosity tester, and the specified viscosity is an industry standard.

[0099] In this embodiment, in S8, the stirring speed is adjusted to -80 r / min, and after sufficient and uniform dissolution, a heat-resistant polyester solvent is obtained, in S9, the prepared heat-resistant polyester insulating paint is tested, and the physical and chemical indexes of the heat-resistant polyester insulating paint are as follows: viscosity (30℃, 35s), appearance is brown red transparent liquid, and solid content is 33%.

[0100] In this embodiment, in S10, three filter screens are sequentially arranged in the filter cartridge from top to bottom, which are a first fiber filter screen, a second fiber filter screen and a copper screen, and large solid particles are removed by filtering, and the quality of the barrel is 30 kg.

[0101] The detection indexes of the heat-resistant polyester insulating paint prepared by using cyanuric acid instead of secco are shown in the following table:

[0102] Heat resistant polyester insulation paint properties Example One Example Two Example Three Polyester insulation paint thickness, mm 0.050 0.050 0.050 Polyester insulation paint grade 3 3 3 Polyester insulation paint appearance Brown red Brown red Brown red Thermal shock 1 D / 220°C, pass 1 D / 230°C, pass 1 D / 240°C, pass Softening breakdown, °C 350 355 366 Breakdown voltage, V 6000-8000 6100-8100 6300-9000

[0103] As shown in the above table, example three is the best embodiment, and the heat-resistant polyester insulating paint prepared has the best performance.

[0104] The performance of the heat-resistant polyester insulating paint prepared by using cyanuric acid in the embodiment of the application and the polyester paint wire paint prepared by using other raw materials is compared, and the comparison results are as follows:

[0105]

[0106] As seen from the above table, the heat-resistant polyester insulating paint prepared from cyanuric acid is in a leading position in various performances, cyanuric acid is more widely sourced and has lower cost, and the heat-resistant polyester insulating paint has good market prospect.

[0107] The application uses cyanuric acid which is more widely sourced and has lower cost to replace secco as the main raw material to produce heat-resistant polyester insulating paint, which can not only reduce the production cost, but also break the monopoly of secco manufacturers, achieve multiple purposes at once, and ensure the stability of the insulating resin market; the addition of cyclohexane dimethyl alcohol can effectively improve the heat shock performance of the heat-resistant polyester insulating paint and further improve the use performance of the heat-resistant polyester insulating paint; the use of weak alkali containing nitrogen heterocyclic as a catalyst can make cyanuric acid, phenothiazine and dimethyl terephthalate have a polyester reaction at a higher temperature to form polyester with a triazine ring structure, thereby greatly improving the heat resistance of the product

[0108] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire, characterized in that, It comprises the following steps: S1: preparing materials, by mass fraction, dimethyl terephthalate 140-150 parts, cyanuric acid 50-60 parts, crosslinking agent 10-18 parts, phenolphthalein 10-15 parts, catalyst 2-8 parts, solvent oil 130-150 parts, ethylene glycol 56-90 parts, cyclohexane dimethyl alcohol 44-58 parts and leveling agent 10-15 parts; S2: reactor temperature dissolution part of raw materials, add equal proportion of dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethyl alcohol into the reactor, the reactor is heated to obtain the dissolved intermediate product; S3: mixing and stirring, the intermediate product is mixed and stirred under the condition of catalyst by using the stirring mechanism on the reactor, and the mixed material is obtained; S4: detecting the acid value of the mixed material obtained in S3, and controlling the acid value of the mixed material in the range below 6mgKOH / g; S5: continuously heating to carry out vacuum polycondensation reaction of the mixed material, the vacuum degree of the vacuum polycondensation reaction needs to be higher than-0.09MPa; S6: observing the viscosity of the mixed material, with the continuous stirring process, the viscosity of the mixed material is judged according to the naked eye; S7: sampling the mixed material, testing the viscosity, and stopping the polycondensation operation when the specified viscosity is reached; S8: preparing heat-resistant polyester solvent, adding solvent oil, crosslinking agent and leveling agent into the mixed material with qualified viscosity to obtain heat-resistant polyester solvent; S9: using polyester solvent to prepare heat-resistant polyester insulating paint; S10: filtering and packaging the heat-resistant polyester insulating paint, and using filter cartridge to filter the heat-resistant polyester insulating paint after preparation.

2. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S1, the required dimethyl terephthalate, cyanuric acid, crosslinking agent, phenolphthalein, catalyst, solvent oil, ethylene glycol, cyclohexane dimethyl alcohol and leveling agent are weighed by weighing equipment, and electronic balance is selected.

3. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S2, the dissolution temperature is 100-150℃, and the dissolution time is 10-15min, until the dimethyl terephthalate, cyanuric acid, phenolphthalein, ethylene glycol and cyclohexane dimethyl alcohol are completely dissolved.

4. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S3, the reactor is a stirring type reaction kettle with temperature control, the stirring speed is between 160r / min-200r / min, the stirring temperature is 170-225℃, the stirring time is 5-20min, and water vapor is continuously discharged, and the practical catalyst is weak base containing nitrogen heterocyclic compound.

5. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S4, the acid value detection adopts ZFSZ100 type full-automatic acid value tester, and a plurality of sampling data need to be detected during the acid value detection to ensure that the overall acid value reaches the specified value, and the detection result is more reliable.

6. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S5, the temperature range of vacuum polycondensation reaction is 220-240℃, and the vacuum degree gradually increases according to the condition of the reactor.

7. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S6, with the continuous vacuum polycondensation reaction, the viscosity of the mixed material increases under the naked eye, and the next operation is carried out when the viscosity of the mixed material increases obviously.

8. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In S7, the viscosity test adopts HYYND-H kinematic viscosity tester, and the specified viscosity is the industry standard.

9. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In the S8, the stirring speed is adjusted to 60r / min-80r / min, and the heat-resistant polyester solvent is obtained after uniform dissolution; in the S9, the prepared heat-resistant polyester insulating paint is tested, and the physical and chemical indexes of the heat-resistant polyester insulating paint are as follows: viscosity (30℃, 35s), appearance is brown red transparent liquid, and solid content is 33%.

10. A process for the manufacture of heat resistant polyester insulating varnish for enameled wire as claimed in claim 1, wherein, In the S10, three filtering screens are sequentially arranged from top to bottom in the filter cylinder, which are a first fiber filtering screen, a second fiber filtering screen and a copper screen, and the mass of the barrel is 30kg.

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