CN115031888B - Detection device and detection method for vacuum defoamation minimum air pressure of resin castable - Google Patents
Detection device and detection method for vacuum defoamation minimum air pressure of resin castable Download PDFInfo
- Publication number
- CN115031888B CN115031888B CN202210723961.XA CN202210723961A CN115031888B CN 115031888 B CN115031888 B CN 115031888B CN 202210723961 A CN202210723961 A CN 202210723961A CN 115031888 B CN115031888 B CN 115031888B
- Authority
- CN
- China
- Prior art keywords
- detection
- detecting
- vacuum
- air pressure
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a device and a method for detecting the minimum air pressure of resin castable in vacuum defoaming, and relates to the field of resin processing. The detection device comprises a vacuum box, a pressure regulating assembly and a detection piece, wherein the pressure regulating assembly is arranged on the vacuum box and used for regulating and monitoring the air pressure inside the vacuum box, a storage tank is arranged in the vacuum box, the detection piece is arranged above the storage tank, and diazabicyclo is smeared on the detection piece. According to the method, the colorless diazabicyclo is adopted to realize specific detection of the gasified anhydride curing agent in the high-temperature low-pressure environment, the anhydride curing agent is contacted with the diazabicyclo, and the anhydride curing agent and the diazabicyclo react to be changed from colorless to red, so that the fact that the anhydride curing agent under the air pressure condition has gasification is explained, the minimum air pressure for vacuum defoamation of the resin castable is facilitated, further, the generation of bubble defects of a cured product in the actual processing process is effectively reduced, and the stability of the product performance is ensured.
Description
Technical Field
The invention relates to the field of resin processing, in particular to a device and a method for detecting the minimum air pressure of resin castable in vacuum defoaming.
Background
The epoxy resin insulating material is a functional material with electrical insulation property, which is formed by crosslinking and curing a matrix resin containing epoxy groups. Because of the advantages of excellent dielectric property, good stability and the like, the composite material has important position in the electric industry and also has wide application in various fields of medicine, aerospace, civil construction, railway vehicles, electronic integrated products and the like.
In order to ensure the excellent performance of the epoxy resin, the epoxy resin depends on the formula design on one hand and is closely related to the casting and curing process on the other hand. In the process of pouring the mixture, vacuum defoaming is one of the key processes of removing bubbles in the castable, promoting the castable to be fully injected into a die and ensuring the performance of the product. However, for partial low-melting-point anhydride curing agents, such as methyl tetrahydrophthalic anhydride, vaporization easily occurs in a high-temperature low-pressure environment, so that a large number of bubble defects exist in the cured product, and vacuum defoaming is invalid, thereby seriously affecting the performance of the epoxy resin.
Therefore, it is clear that the minimum air pressure for vacuum degassing of the epoxy resin casting material is an important measure for suppressing the bubble defect of the cured product.
Disclosure of Invention
The invention provides a device and a method for detecting the minimum air pressure of vacuum defoamation of a resin castable, which are used for effectively detecting the minimum air pressure of the vacuum defoamation of the resin castable and solving the technical problem that a resin cured product has air bubble defects.
In order to solve the technical problems, one of the purposes of the invention is to provide a detection device for the minimum air pressure of resin castable in vacuum defoaming, which comprises a vacuum box, a pressure regulating component and a detection piece, wherein the pressure regulating component is arranged in the vacuum box and is used for regulating and monitoring the air pressure in the vacuum box, a storage tank is arranged in the vacuum box, the detection piece is positioned above the storage tank, and diazabicyclo is smeared on the detection piece.
Through adopting above-mentioned scheme, this application adopts colourless diazabicyclo to realize carrying out specificity detection to the anhydride curing agent of vaporization under the high temperature low pressure environment, through preheating the storage pond to the temperature of settlement, adopt pressure regulating subassembly to reduce the vacuum incasement atmospheric pressure simultaneously, when the anhydride curing agent takes place the vaporization under a certain atmospheric pressure condition, can put the diazabicyclo contact that the probe was paintd on, both take place the reaction and become red by colourless, the anhydride curing agent under this atmospheric pressure condition has the vaporization condition, help definitely resin castable vacuum defoamation's minimum atmospheric pressure, and then effectively reduce the production of curing product bubble defect in the actual course of working, product performance's stability has been guaranteed.
Preferably, the resin castable is epoxy resin castable containing an anhydride curing agent.
Preferably, the detecting member is a detecting plate, and the diazabicyclo is smeared on one surface of the detecting plate facing the storage tank.
As the preferable scheme, the detecting piece is detachably connected with the vacuum box through the adjusting component, the adjusting component comprises a detecting bracket which is horizontally arranged on the inner wall of the vacuum box in a sliding mode, and the detecting bracket is connected with the detecting plate.
As an optimal scheme, the detection support is detachably and fixedly provided with a guide rod, the detection support is connected with the detection plate through the guide rod, and the guide rod is vertically and slidably connected with the detection support.
Preferably, the pressure regulating assembly comprises a vacuum pump and a barometer.
Preferably, the storage tank is arranged in the vacuum box through a heat insulation bracket.
Preferably, the storage tank is arranged in a groove shape.
Preferably, the detection plate is transparent.
Preferably, the vacuum box is transparent.
Preferably, the guide rod is transparent.
In order to solve the technical problems, one of the purposes of the invention is to provide a method for detecting the minimum air pressure of resin castable in vacuum defoaming, which comprises the following steps:
(1) After the preparation of the resin castable is finished, injecting the resin castable into a preheated storage tank, wherein the preheating temperature is consistent with the preheating temperature of an actual casting mold;
(2) The pressure in the vacuum box is regulated through the pressure regulating component, whether the color of the detection piece is changed or not is observed, once the detection piece turns red, the detection piece is immediately closed, and the pressure value at the moment is recorded and is recorded as P; charging air into the vacuum box, replacing and preheating the storage tank, injecting new resin casting material, replacing the detection part, performing air extraction test again, and increasing the detection air pressure according to 0.5P until the detection part is kept in a colorless state under a certain detection air pressure, wherein the air pressure value at the moment is the lowest air pressure for vacuum defoamation.
Preferably, the method further comprises the step of pushing the detection support and the guide rod to adjust the position of the detection plate in the horizontal and vertical directions before the step (2), so that the detection plate is aligned with the storage tank and has a proper distance.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the diazabicyclo is adopted to realize the specific detection of the vaporized anhydride curing agent at high temperature and low pressure, so that the minimum air pressure for vacuum defoamation of the epoxy resin castable can be clarified, the generation of bubble defects of a cured product is effectively reduced, and the stability of the product performance is ensured.
Drawings
Fig. 1: the invention discloses a schematic cross-sectional structure of a device for detecting the minimum air pressure of resin castable in vacuum defoamation.
Wherein, the reference numerals of the specification drawings are as follows: 1. a vacuum box; 2. a vacuum pump; 3. an air pressure gauge; 4. an air duct; 5. detecting a bracket; 6. a guide rod; 7. a detection plate; 8. a storage tank; 9. and a heat insulation support.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The application provides a detection device of minimum atmospheric pressure of resin castable vacuum defoamation, including vacuum box 1, pressure regulating subassembly and detecting element, vacuum box 1 is transparent organic glass vacuum box 1, pressure regulating subassembly is including setting up vacuum box 1 top and being used for adjusting the vacuum pump 2 of inside atmospheric pressure and setting up in vacuum box 1 side and being used for detecting the barometer 3 of inside atmospheric pressure, vacuum pump 2 is rotary vane vacuum pump 2, barometer 3 is high accuracy vacuum pneumatic pump, the precision is 10MPa, barometer 3 and vacuum pump 2 all pass through pipe and vacuum box 1 internal connection. The pressure inside the vacuum box 1 is regulated by the vacuum pump 2, and the pressure change inside the vacuum box 1 is monitored in real time by the barometer 3.
The inside bottom surface of vacuum box 1 is fixed and is provided with thermal-insulated support 9, and thermal-insulated support 9 is polytetrafluoroethylene support, and thermal-insulated support 9 is kept away from the side on the internal ground of vacuum box 1 and is provided with the magazine 8 that is used for taking advantage of putting the resin castable, and preferably, the resin castable of this application is the epoxy resin castable that contains the anhydride curing agent. The top of the storage tank 8 is opened, the storage tank 8 is a polytetrafluoroethylene groove piece, the outer length is 5cm, the outer width is 3cm, the outer height is 1cm, the inner groove length is 4cm, the width is 2cm, and the depth is 0.5cm. Preferably, the bottom of the storage tank 8 is detachably connected with the heat insulation support 9, so that the detection, placement and removal of the resin casting material are facilitated.
The detection piece is a detection plate 7 which is arranged above the material storage tank 8 and is placed in parallel, the detection plate 7 is specifically a transparent high borosilicate glass plate, the length is 4cm, the width is 2cm, and colorless diazabicyclo is uniformly smeared on one side of the detection plate 7, which faces the material storage tank 8. When the resin casting material is in a high-temperature low-pressure environment, the anhydride curing agent is vaporized at the lowest air pressure and contacts with the diazabicyclo coated on the upper detection plate 7, and the colorless diazabicyclo and the vaporized anhydride curing agent are mixed to become red, so that the colorless diazabicyclo can be used for detecting the lowest air pressure for indicating the vacuum defoaming of the epoxy resin casting material.
The detection plate 7 is horizontally slipped and arranged inside the vacuum box 1 through the adjusting component, the adjusting component comprises a detection support 5 and a guide rod 6, the detection support 5 is a stainless steel support, the detection support 5 is vertically arranged inside the vacuum box 1 and is positioned on one side of the storage tank 8, and the top end and the bottom end of the detection support 5 are respectively and horizontally slipped and connected with the inner top surface and the inner bottom surface of the vacuum box 1. The guide rod 6 is a transparent organic glass rod, two ends of the guide rod 6 are respectively and detachably and fixedly connected with the detection support 5 and the detection plate 7, the detection support 5 is pushed to horizontally displace in the vacuum box 1, and the horizontal position of the detection plate 7 in the vacuum box 1 can be adjusted, so that the detection plate 7 can be positioned right above the storage pool 8. Preferably, the guide rod 5 and the detection support 5 are detachably fixed, the guide rod 6 is connected with the detection support 5 in a sliding manner up and down, and the distance between the detection plate 7 and the storage tank 8 can be adjusted in the vertical direction.
On the basis of the detection device for the minimum vacuum defoamation pressure of the resin castable, the application also provides a detection method for the minimum vacuum defoamation pressure of the resin castable, which comprises the following steps:
(1) After the preparation of the epoxy resin castable is finished, injecting the epoxy resin castable into a preheated storage tank 8, wherein the preheating temperature is consistent with the preheating temperature of an actual casting mold;
(2) Pushing the detection bracket 5 and the guide rod 6 to adjust the position of the detection plate 7 in the horizontal and vertical directions so that the detection plate 7 is aligned with the storage tank 8 and has a proper distance;
(3) Starting the vacuum pump 2, observing whether the detection plate 7 changes color, immediately closing the vacuum pump 2 once the detection plate 7 turns red, and recording the air pressure value at the moment, namely P; charging air into the vacuum box 1, replacing and preheating the storage tank 8, injecting new casting materials, replacing the detection plate 7, and performing an air extraction test again; and the detected air pressure is increased by 0.5P until the detection plate 7 keeps a colorless state under a certain detected air pressure, and the air pressure value at the moment is the lowest air pressure of vacuum defoamation.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. The detection method of the minimum vacuum defoamation air pressure of the resin casting material is characterized by comprising a vacuum box (1), a pressure regulating component and a detection piece, wherein the pressure regulating component is arranged in the vacuum box (1) and is used for regulating and monitoring the air pressure in the vacuum box (1), a storage tank (8) is detachably arranged in the vacuum box (1), the detection piece is positioned above the storage tank (8), and diazabicyclo is smeared on the detection piece; the resin castable is epoxy resin castable containing an anhydride curing agent; the detection method comprises the following steps:
(1) After the preparation of the resin castable is finished, injecting the resin castable into a preheated storage tank, wherein the preheating temperature is consistent with the preheating temperature of an actual casting mold;
(2) The pressure in the vacuum box is regulated through the pressure regulating component, whether the color of the detection piece is changed or not is observed, once the detection piece turns red, the detection piece is immediately closed, and the pressure value at the moment is recorded and is recorded as P; charging air into the vacuum box, replacing and preheating the storage tank, injecting new resin casting material, replacing the detection part, performing air extraction test again, and increasing the detection air pressure according to 0.5P until the detection part is kept in a colorless state under a certain detection air pressure, wherein the air pressure value at the moment is the lowest air pressure for vacuum defoamation.
2. The method for detecting the minimum vacuum defoamation air pressure of the resin casting material according to claim 1, wherein the detecting piece is a detecting plate (7), and the diazabicyclo is smeared on one surface of the detecting plate (7) facing the storage tank (8).
3. The method for detecting the minimum vacuum defoaming air pressure of the resin castable according to claim 2, wherein the detecting piece is detachably connected with the vacuum box (1) through an adjusting component, the adjusting component comprises a detecting bracket (5) horizontally arranged on the inner wall of the vacuum box (1) in a sliding mode, and the detecting bracket (5) is connected with a detecting plate (7).
4. A method for detecting the minimum vacuum defoaming air pressure of a resin casting material according to claim 3, wherein a guide rod (6) is detachably and fixedly arranged on the detection support (5), the detection support (5) is connected with a detection plate (7) through the guide rod (6), and the guide rod (6) is vertically and slidably connected with the detection support (5).
5. The method for detecting the minimum vacuum degassing pressure of the resin casting material according to claim 1, wherein the pressure regulating assembly comprises a vacuum pump (2) and a barometer (3).
6. The method for detecting the minimum vacuum degassing pressure of the resin castable according to claim 1, wherein the storage tank (8) is arranged inside the vacuum box (1) through the heat insulation support (9).
7. The method for detecting the minimum vacuum degassing pressure of the resin casting material according to claim 2, wherein the detection plate (7) is arranged in a transparent manner, and the vacuum box (1) is arranged in a transparent manner.
8. The method of claim 1, further comprising pushing the test rack and the guide bar to adjust the position of the test plate in the horizontal and vertical directions before the step (2) so that the test plate is aligned with the reservoir and is at a proper distance.
9. A device for detecting the minimum vacuum degassing pressure of a resin casting material in the method for detecting the minimum vacuum degassing pressure of a resin casting material according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723961.XA CN115031888B (en) | 2022-06-24 | 2022-06-24 | Detection device and detection method for vacuum defoamation minimum air pressure of resin castable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723961.XA CN115031888B (en) | 2022-06-24 | 2022-06-24 | Detection device and detection method for vacuum defoamation minimum air pressure of resin castable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115031888A CN115031888A (en) | 2022-09-09 |
| CN115031888B true CN115031888B (en) | 2023-04-25 |
Family
ID=83127802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210723961.XA Active CN115031888B (en) | 2022-06-24 | 2022-06-24 | Detection device and detection method for vacuum defoamation minimum air pressure of resin castable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115031888B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012153768A (en) * | 2011-01-24 | 2012-08-16 | Panasonic Corp | Method for manufacturing thermosetting resin molded product |
| CN202454132U (en) * | 2012-02-22 | 2012-09-26 | 武汉大学 | Pressure regulating device for static measurement experiment in saturated vapor pressure of liquid |
| CN103196618A (en) * | 2013-03-11 | 2013-07-10 | 常州大学 | Petroleum product full-automatic vacuum type saturated vapor pressure measuring device and measuring method thereof |
| CN104816392A (en) * | 2015-04-14 | 2015-08-05 | 张金木 | Epoxy resin vacuum degassing pressure control system |
| CN205535047U (en) * | 2016-02-01 | 2016-08-31 | 连云港市金囤农化有限公司 | Detection device suitable for liquid chlorine vaporizer |
| CN108099074A (en) * | 2017-12-22 | 2018-06-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of room temperature curing epoxy vacuum defoaming device and defoaming method |
| CN209069538U (en) * | 2018-11-23 | 2019-07-05 | 上海天祥质量技术服务有限公司 | A kind of multi-functional true empty van test device |
| CN110987134A (en) * | 2019-11-21 | 2020-04-10 | 贵州电网有限责任公司 | Gas cylinder weight detection device and detection method thereof |
| CN111413249A (en) * | 2020-03-11 | 2020-07-14 | 洛阳双瑞风电叶片有限公司 | Method for detecting content of bubbles in matrix resin of composite material |
-
2022
- 2022-06-24 CN CN202210723961.XA patent/CN115031888B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012153768A (en) * | 2011-01-24 | 2012-08-16 | Panasonic Corp | Method for manufacturing thermosetting resin molded product |
| CN202454132U (en) * | 2012-02-22 | 2012-09-26 | 武汉大学 | Pressure regulating device for static measurement experiment in saturated vapor pressure of liquid |
| CN103196618A (en) * | 2013-03-11 | 2013-07-10 | 常州大学 | Petroleum product full-automatic vacuum type saturated vapor pressure measuring device and measuring method thereof |
| CN104816392A (en) * | 2015-04-14 | 2015-08-05 | 张金木 | Epoxy resin vacuum degassing pressure control system |
| CN205535047U (en) * | 2016-02-01 | 2016-08-31 | 连云港市金囤农化有限公司 | Detection device suitable for liquid chlorine vaporizer |
| CN108099074A (en) * | 2017-12-22 | 2018-06-01 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of room temperature curing epoxy vacuum defoaming device and defoaming method |
| CN209069538U (en) * | 2018-11-23 | 2019-07-05 | 上海天祥质量技术服务有限公司 | A kind of multi-functional true empty van test device |
| CN110987134A (en) * | 2019-11-21 | 2020-04-10 | 贵州电网有限责任公司 | Gas cylinder weight detection device and detection method thereof |
| CN111413249A (en) * | 2020-03-11 | 2020-07-14 | 洛阳双瑞风电叶片有限公司 | Method for detecting content of bubbles in matrix resin of composite material |
Non-Patent Citations (1)
| Title |
|---|
| 韩养军 等.一种耐温环氧树脂浇注料的研究.《第十三次全国环氧树脂应用技术学术交流会论文集》.2009,第170-171页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115031888A (en) | 2022-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103278526B (en) | Asphalt volume expansion and shrinkage coefficient determinator and method | |
| CN115031888B (en) | Detection device and detection method for vacuum defoamation minimum air pressure of resin castable | |
| CN107064754A (en) | A kind of variable pulse voltage triggers the device of epoxy resin insulation material electric branch | |
| CN103644835B (en) | A kind of measurement apparatus of temperature drift coefficient of eddy current displacement sensor | |
| CN110631961A (en) | Method for determining optimal mixing amount of warm-mix agent of fiber warm-mix asphalt mixture | |
| CN105666801A (en) | Sandwich tablet sample preparing die for epoxy resin and method | |
| CN107367523A (en) | A kind of method of the effectively chemical shrinkage factor of same with thermosetting compound material of monitoring in real time | |
| CN113593794B (en) | Automatic pressure gel pure dry type capacitor type high-voltage insulating sleeve and manufacturing method thereof | |
| CN208736736U (en) | A kind of die trial of pitch silica gel plate and model type being matched in dynamic shear rheometer | |
| CN102323147B (en) | Method and device for measuring elastic modulus of volume of polymer melt | |
| CN212860190U (en) | Half-open type intelligent temperature control glue filling mold | |
| CN108918977B (en) | Device and method for measuring dielectric gas-solid interface flashover characteristic under low temperature condition | |
| CN108530906B (en) | Silicon nitride reinforced addition type heat-conducting silica gel | |
| CN112147054B (en) | Rapid test method for matrix communication porosity of semi-flexible pavement | |
| CN110006731A (en) | The sampling die and method for making sample of the electrical performance test of external insulation anti-pollution flashover coating | |
| CN203534881U (en) | Sample preparation device for thermal mechanical test of fluid samples | |
| CN111413249A (en) | Method for detecting content of bubbles in matrix resin of composite material | |
| CN111579480A (en) | Storage battery terminal performance simulation test structure and method thereof | |
| CN101428341A (en) | High purity waterless boron oxide casting mold apparatus and method | |
| CN114002261B (en) | Asphalt mixture line shrinkage coefficient measuring device and using method thereof | |
| CN219686390U (en) | Injection mold for instrument production | |
| CN216449275U (en) | Remoulded sample preparation device for soil test | |
| CN113447173B (en) | Method for directly measuring stress of coiled tubing with arc defects in photoelastic experiment | |
| CN221259951U (en) | Detection mechanism for plastic mold processing | |
| CN216559958U (en) | Concrete impermeability test piece suite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |