CN104742265A - Degassing temperature and stirring speed control system for epoxy resin secondary mixed material - Google Patents
Degassing temperature and stirring speed control system for epoxy resin secondary mixed material Download PDFInfo
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- CN104742265A CN104742265A CN201510173323.5A CN201510173323A CN104742265A CN 104742265 A CN104742265 A CN 104742265A CN 201510173323 A CN201510173323 A CN 201510173323A CN 104742265 A CN104742265 A CN 104742265A
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Abstract
The invention relates to a degassing temperature and stirring speed control system for an epoxy resin secondary mixed material. The system is used for detecting the vacuum stirring and defoaming effect of the mixed material under each specific temperature and stirring speed when the epoxy resin mixing formula or the vacuumizing condition is changed, the temperature and stirring speed set values produced during ordinary production are obtained by virtue of comparison, and multiple temperature and stirring speed settings can be selected according to the vacuumizing consumption time, labor consumption and energy consumption in necessary.
Description
(1) technical field:
The present invention relates to epoxy resin secondary batch mixing degassing temperature mixing speed control system, for when change epoxy resin mixture recipes or when vacuumizing operating mode, detect the effect of its batch mixing vacuum stirring deaeration under each specified temp and mixing speed, by comparing the temperature and mixing speed setting value that acquisition produces at ordinary times, if desired according to vacuumizing elapsed time, work consumption, energy consumption, multiple described temperature also can be chosen and mixing speed is arranged.
(2) background technology:
The combination property of epoxy resin is splendid, its formula Design is versatile and flexible, epoxy resin is used widely in the field such as electric power, electronic apparatus, the particularly mould material of the electrical equipment such as electric power mutual-inductor, transformer, insulator, when epoxy resin is applied to high voltage electrical equipment, require that it has extremely low partial discharge quantity, otherwise premature aging, electric leakage will puncture even accidents caused because partial discharge quantity exceeds standard.Pore in epoxide resin material produces the main reason of shelf depreciation, therefore when poured with epoxy resin, all adopts vacuum pouring deaeration technology to reduce air gap in cast product and bubble as far as possible.
Typical technique is that the fillers such as resin, curing agent and silicon emblem powder, mill base are calculated each component weight by proportioning, and preheating 60 DEG C/3 ~ 4h in an oven in advance after weighing, its batch mixing divides firsts and seconds batch mixing.Storage tank A, the heating system of storage tank B and vacuum system is first started in secondary batch mixing.Add the resin after preheating, filler toward storage tank A again, and add the curing agent after preheating, filler in storage tank B, storage tank A whipping temp is set as 55 DEG C, stir 3 ~ 4 hours, storage tank B whipping temp is set as 50 DEG C, stir 3 ~ 4 hours.Then vacuumize stirring to storage tank A, storage tank B, vacuum is all set to 4mbar.After above-mentioned vacuum outgas, then in mixing tank batch mixing stir vacuumize again after batch mixing imported in pouring can pour into a mould the demoulding after curing oven heating cure again.
(3) summary of the invention:
High-viscosity epoxy resin batch mixing liquid in atmosphere, also certain gas is dissolved with, but bubble size is very little in batch mixing liquid depths, usually exist with microbubble form, the speed that microbubble relies on natural buoyancy to rise is extremely slowly, external force must be relied on to take bubble to liquid level, and therefore comparatively effective deaeration mode adopts the method such as vacuum stirring deaeration and vacuum film deaeration at present.Pressure in tank diameter increases from top to bottom successively, has occurred larger low-pressure area in middle and upper part, therefore, according to the condition of bubble formation, bubble mainly in, upper grown, to gather and deaeration.
Due to each composition material of liquid-state epoxy resin batch mixing and the different of proportioning thereof, also may due to epoxy resin, curing agent inherent quality problem, cause the gel time often criticizing batch mixing inconsistent, and the vacuum stirring deaeration process variations of the vacuum deaerator plant performance used and employing thereof is very large, therefore the technological parameter of existing vacuum stirring deaeration arranges and is mostly by rule of thumb or arranges with reference to process similarity, specific aim is poor, its setting value does not rationally change with the manufacturer of mixture recipes or material or working conditions change, affects deaeration effect and product quality.The present invention introduces a kind of epoxy resin secondary batch mixing degassing temperature mixing speed control system, for adopting the vacuum stirring deaeration of secondary mixing system technique, in secondary mixing system, storage tank A is an epoxy resin, filler batch mixing degas system, when changing epoxy resin mixture recipes or factory or redefining technological parameter when vacuumizing operating mode, it is characterized in that when changing mixture recipes or vacuumizing operating mode, storage tank A is compared in intensification and vacuum stirring de-aeration by Site Detection, the vacuum stirring deaeration effect of its batch mixing under each specified temp and set mixing speed, make it can not affect production in original system, select the temperature of the technique of vacuum stirring deaeration at ordinary times and the optimum configurations of mixing speed.
Epoxy resin raises its viscosity with temperature and declines, but when temperature rises to certain value, viscosity downward trend slows down, and is finally substantially tending towards certain numerical value, and in epoxy resin batch mixing, the more granularities of loading of filler its batch mixing viscosity thinner increases more in addition.It makes epoxy resin temperature, viscosity corresponding relation to the skew of viscosity augment direction in batch mixing, and bubble surface tension force diminishes along with the density contrast of the two body phases adjacent with superficial layer and diminishes, therefore surface tension also declines with viscosity and reduces.After bubble rises to nearly liquid level, bubble can not be overflowed at once, but under the effect of pressure reduction, bubble continues to expand, and stay for some time under nearly liquid level, after shaking off liquid level tension force, could overflow or break, its time of staying shortens with the reduction of the viscosity of pressure, batch mixing liquid, in sum, the viscosity of bubble effusion efficiency and epoxy resin batch mixing is closely related, and epoxy resin compound viscosity relation non-linear with temperature, therefore different optimum temperature setting values is just existed for different batch mixings.
On the other hand, bubble effusion effect and mixing speed closely related, when many bubbles being in Different growth phases occur, too high mixing speed will make a part of bubble have little time to grow to break and overflow fully to be brought back again batch mixing liquid depths, too low mixing speed makes bubble take liquid level time lengthening to, and effective inclined heated plate is shortened.Due to different temperature and compound viscosity, make the number of bubbles and the speed of growth difference that are in Different growth phases, therefore mixing speed is selected different, makes the bubble being in different growing stages be transported to liquid level and is changed with the difference of temperature and viscosity by effective conevying efficiency of overflowing.
System utilizes the change of vacuum to reflect the change of bubble effusion quantity and volume in epoxy resin batch mixing, under the design temperature of a certain reflection viscosity B coefficent, by starting vavuum pump, detect vacuum and reach time of higher limit (low pressure limit value) from preset lower limit, be reflected in this mixing speed and lower deaeration efficiency be set and compare the setting for optimizing mixing speed by repeatedly production testing.Meanwhile, by closing vavuum pump, detecting vacuum reaches lower limit (upper pressure limit value) time from capping value, reflecting deaeration effect at such a temperature, compared by the detection of each temperature set-point and arrange for optimizing temperature.
Described epoxy resin secondary batch mixing degassing temperature mixing speed control system, mixing speed for storage tank A vacuum stirring de-aeration in this system controls, when the system is operated, first resin, filler are calculated each component weight by proportioning, for subsequent use after carrying out preheating and drying process in advance by former technological requirement in baking oven or hot-blast stove after weighing, then start heating system and the vacuum system of storage tank A.First epoxy resin is dropped at storage tank A, drop into again under silicon powder is cooled to top temperature and heat up, the temperature of vacuum stirring can be carried out after its top temperature and epoxy resin melting, such as start staged at 40 DEG C to about 50 DEG C to heat up, warming room is every equal, first stirring makes batch mixing evenly open vavuum pump again in 5-15 minute, vacuum is set within the scope of a bound, such as can be pressed the vacuum setting value of former technique as low pressure limit value, and get vacuum decline (pressure increase) to this low pressure limit value add 6-15% as higher limit, the pressure signal of its reflection vacuum send master controller process, its working signal opening or closing vavuum pump is sent by master controller.Master controller adopts staged heating mode, the identical warming room of about each desirable 3-8 DEG C every.The a little higher than mixing tank design temperature of its terminal temperature, requires that intensification power is large, speed is fast and evacuation rate is fast by such as 75 DEG C about-90 DEG C.The mixing speed of agitator adopts successively decreases according to described staged heating mode temperature section at different levels, the i.e. maximum temperature mixing speed that adopts former technique to determine to low lapse of temperature, and through repeatedly production effect contrast, its mixing speed at different levels and the bubble speed of effusion are adapted.
During system works, storage tank A first heats up and opens vacuum pump evacuation when making vacuum reach setting pressure lower limit and reach relevant temperature section design temperature at top temperature, close vavuum pump and valve, the drop timer timing when vacuum drops to setting pressure higher limit starting vacuum terminates, make to open again after too much bubble is eliminated in several seconds time delay the rising timer that valve and vacuum pump evacuation start vacuum simultaneously, make vacuum reach the timing of setting pressure lower limit to terminate to enter next section, so go round and begin again, sequentially record the drop timer of each vacuum and the timing time of rising timer, its rising timer reflection mixing speed arranges the impact on vacuumizing performance, the rising timer timing time length of more each vacuum, reflect the vacuum stirring deaeration efficiency of its design temperature point, determine its mixing speed thus mixing speed under obtaining each temperature-viscosity, its drop timer reflection system is at each temperature section bubble formation speed, the drop timer timing time of the more each vacuum of deduction vaccum leakage rate impact reflects deaeration effect, the inclined heated plate that can be allowed by technique as required, revise bubble removal step temperature range and top temperature that former technique determines and terminal temperature is arranged to increase and decrease the pumpdown time, again the set temperature section of examination temperature and mixing speed combines and the scheme of running time, its running time, the inclined heated plate according to deaeration effect and permission was arranged, then to reach final vacuum choose its drop timer timing time relatively long corresponding to temperature section, as the temperature of producing at ordinary times and mixing speed setting value temperature-constant operation, if desired according to vacuumizing elapsed time, work consumes, energy consumption, through multiple described temperature and mixing speed setting value more also can be chosen, namely all the other temperature sections proceed to next temperature section after being warmed up to desired temperature by the setting of its temperature and mixing speed.Otherwise the desired temperature that existing technique only establishes desired temperature usually high get the short time or, the present invention has more described selection scheme according to deaeration effect, and therefore will reach final vacuum for batch mixing has more rationally Scheme Choice accurately.Then stop heating up after terminal temperature and constant-temperature vacuum stirring deaeration under the desired temperature of former technological requirement and the activity time of permission thereof, undertaken pouring into a mould, solidifying and the demoulding by former technological requirement more afterwards, complete testing process.Finally, with PD meter, detection is put to pouring piece make-game if desired, check whether it meets relevant national standard or inner controlling standard of enterprise adjusts pumpdown time and desired temperature again.
Produce at ordinary times and do not do described detection, only run according to described temperature and the mixing speed plan of establishment, all the other are all by former technological requirement operation.
(4) accompanying drawing illustrates:
Accompanying drawing is the circuit structure block diagram of epoxy resin secondary batch mixing degassing temperature mixing speed control system.
(5) detailed description of the invention:
As shown in drawings, it is made up of temperature sensor 2, master controller 7, pressure sensor 3, pressure transmitter 4, vavuum pump 5, vavuum pump drive circuit 6, stirring motor drive circuit 8 and storage tank A1 the circuit structure block diagram of epoxy resin secondary batch mixing degassing temperature mixing speed control system.Wherein master controller 7 also can be master control cabinet industrial computer, realizes function described in master controller 7 by it, and master control cabinet industrial computer can realize setting to a complete set of equipment, Centralized Monitoring, major parameter record and operation by configuration software.Pressure sensor 3 is connected with the vacuum chamber of storage tank A1, and for the vacuum of detection system, master controller 7 opens or closes by vavuum pump drive circuit 6 vacuum that vavuum pump 5 carrys out control system.The signal of pressure sensor 3 send master controller 7 to process through pressure transmitter 4, and master controller 7 circuit is simultaneously for the vacuum of control system.After starting storage tank A1 degas system, if the pressure in vacuum chamber reaches capping value, then master controller 7 circuit will send signal to vavuum pump drive circuit 6 and magnetic valve, and vavuum pump 5 will start immediately.When the pressure in vacuum chamber reaches preset lower limit, master controller 7 circuit will close vavuum pump 5.Mixing speed controls to be completed by stirring motor drive circuit 8, and its speed control signal is provided by master controller 7.
Claims (2)
1. epoxy resin secondary batch mixing degassing temperature mixing speed control system, for adopting the vacuum stirring deaeration of secondary mixing system technique, in secondary mixing system, storage tank A is an epoxy resin, filler batch mixing degas system, it is characterized in that when changing mixture recipes or vacuumizing operating mode, storage tank A is compared in intensification and vacuum stirring de-aeration by Site Detection, the vacuum stirring deaeration effect of its batch mixing under each specified temp and set mixing speed, make it in original system, can not affect production and select the temperature of the technique of vacuum stirring deaeration at ordinary times and the optimum configurations of mixing speed, bubble effusion effect and mixing speed closely related, when many bubbles being in Different growth phases occur, too high mixing speed will make a part of bubble have little time to grow to break and overflow fully to be brought back again batch mixing liquid depths, too low mixing speed makes bubble take liquid level time lengthening to, effective inclined heated plate is shortened, system utilizes the change of vacuum to reflect the change of bubble effusion quantity and volume in epoxy resin batch mixing, under the design temperature of a certain reflection viscosity B coefficent, by starting vavuum pump, detect vacuum reaches higher limit (low pressure limit value) time from preset lower limit, be reflected in this mixing speed and lower deaeration efficiency is set, and compare the setting for optimizing mixing speed by repeatedly production testing, simultaneously, by closing vavuum pump, detect vacuum reaches lower limit (upper pressure limit value) time from capping value, reflect deaeration effect at such a temperature, compared by the detection of each temperature set-point and arrange for optimizing temperature,
First epoxy resin is dropped at storage tank A, drop into again under silicon powder is cooled to top temperature and heat up, the temperature of vacuum stirring can be carried out after its top temperature and epoxy resin melting, vacuum is set within the scope of bound, the vacuum setting value of former technique can be pressed as low pressure limit value, and get vacuum decline (pressure increase) to this low pressure limit value add 6-15% as higher limit, the pressure signal of its reflection vacuum send master controller process, its working signal opening or closing vavuum pump is sent by master controller, master controller adopts staged heating mode, the identical warming room of each desirable 3-8 DEG C every, the a little higher than mixing tank design temperature of its terminal temperature, the mixing speed of agitator adopts successively decreases according to described staged heating mode temperature section at different levels, the i.e. maximum temperature mixing speed that adopts former technique to determine to low lapse of temperature, and through the contrast of repeatedly production effect, its mixing speed at different levels and the bubble speed of effusion are adapted, during system works, storage tank A first heats up and opens vacuum pump evacuation when making vacuum reach setting pressure lower limit and reach relevant temperature section design temperature at top temperature, close vavuum pump and valve, the drop timer timing when vacuum drops to setting pressure higher limit starting vacuum terminates, do to open valve and vacuum pump evacuation again after too much bubble is eliminated in several seconds time delay, start the rising timer of vacuum simultaneously, make vacuum reach the timing of setting pressure lower limit to terminate to enter next section, so go round and begin again, sequentially record the drop timer of each vacuum and the timing time of rising timer, its rising timer reflection mixing speed arranges the impact on vacuumizing performance, the rising timer timing time length of more each vacuum, reflect that the vacuum stirring deaeration efficiency of its design temperature point is to determine its mixing speed, thus the mixing speed obtained under each temperature-viscosity, its drop timer reflection system is at each temperature section bubble formation speed, the drop timer timing time of the more each vacuum of deduction vaccum leakage rate impact reflects deaeration effect, the inclined heated plate that can be allowed by technique as required, revise the bubble removal step temperature range that former technique is determined, namely top temperature and terminal temperature are arranged to increase and decrease the pumpdown time, again the set temperature section of examination temperature and mixing speed combines and the scheme of running time, its running time, the inclined heated plate according to deaeration effect and permission was arranged, then to reach final vacuum choose its drop timer timing time relatively long corresponding to temperature section, as the temperature of producing at ordinary times and mixing speed setting value temperature-constant operation, if desired according to vacuumizing elapsed time, work consumes, energy consumption, through multiple described temperature and mixing speed setting value more also can be chosen, namely all the other temperature sections proceed to next temperature section after being warmed up to desired temperature by the setting of its temperature and mixing speed, otherwise the desired temperature that existing technique only establishes desired temperature usually high get the short time or, the present invention has more described selection scheme according to deaeration effect, then stop heating up after terminal temperature and constant-temperature vacuum stirring deaeration under the desired temperature of former technological requirement and the activity time of permission thereof, pour into a mould by former technological requirement more afterwards, solidification and the demoulding, complete testing process.
2. epoxy resin secondary batch mixing degassing temperature mixing speed control system according to claim 1, is characterized in that it comprises:
It is by temperature sensor 2, master controller 7, pressure sensor 3, pressure transmitter 4, vavuum pump 5, vavuum pump drive circuit 6, stirring motor drive circuit 8 and storage tank A 1 form, wherein master controller 7 also can be master control cabinet industrial computer, function described in master controller 7 is realized by it, pressure sensor 3 is connected with the vacuum chamber of storage tank A 1, for the vacuum of detection system, master controller 7 opens or closes by vavuum pump drive circuit 6 vacuum that vavuum pump 5 carrys out control system, the signal of pressure sensor 3 send master controller 7 to process through pressure transmitter 4, master controller 7 circuit is simultaneously for the vacuum of control system, mixing speed controls to be completed by stirring motor drive circuit 8, its speed control signal is provided by master controller 7.
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| CN201510173323.5A CN104742265B (en) | 2015-04-14 | 2015-04-14 | Epoxy resin second level mixing degassing temperature mixing speed control system |
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| CN201510173323.5A CN104742265B (en) | 2015-04-14 | 2015-04-14 | Epoxy resin second level mixing degassing temperature mixing speed control system |
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| CN104742265B CN104742265B (en) | 2019-03-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112206551A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Stirring speed control method and device based on stirring pressure |
| CN112213267A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Headspace degassing method and device of oil-immersed equipment |
| CN112213270A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Stirring speed control method and device based on viscosity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112206551A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Stirring speed control method and device based on stirring pressure |
| CN112213267A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Headspace degassing method and device of oil-immersed equipment |
| CN112213270A (en) * | 2020-09-29 | 2021-01-12 | 湖北鑫英泰系统技术股份有限公司 | Stirring speed control method and device based on viscosity |
| CN112213267B (en) * | 2020-09-29 | 2021-11-16 | 湖北鑫英泰系统技术股份有限公司 | Headspace degassing method and device of oil-immersed equipment |
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