CN102331386A - Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve - Google Patents
Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve Download PDFInfo
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- CN102331386A CN102331386A CN201110163452A CN201110163452A CN102331386A CN 102331386 A CN102331386 A CN 102331386A CN 201110163452 A CN201110163452 A CN 201110163452A CN 201110163452 A CN201110163452 A CN 201110163452A CN 102331386 A CN102331386 A CN 102331386A
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Abstract
The invention relates to a method for testing an EVA (ethylene-vinyl acetate) viscosity temperature variation curve, in which a rheometer is adopted under an oscillation mode for temperature scanning, the deformation and the frequency are fixed, the variation of viscosity along with a temperature is tested, and the temperature can be a constant temperature, constant speed rising temperature or variable speed rising temperature. The invention has the beneficial effects that the operation is automatic, and the overall cost is lower, which is conductive to quality control; the method belongs to a physical method, the overall viscosity variation can be obtained directly through measurement; and the method is scientific and reasonable; the measurement precision is high, the temperature can be the constant temperature, the constant speed rising temperature or the variable speed rising temperature, the data is more accurate, and the system error is small. The method can provide important references for formulating lamination technological parameters of EVA.
Description
Technical field
The present invention relates to the method for the sticking warm change curve of a kind of EVA of test.
Background technology
Laminating machine is the key instrument that vacuum lamination process uses; To photovoltaic EVA design, its effect is carried out heating and pressurizing to photovoltaic EVA exactly under vacuum condition, realizes the curing of EVA; And prevent that the battery sheet is shifted and the generation of bubble, reach purpose to the solar cell sealing.
The parameter that in lamination process, at first need confirm: the opportunity of pressurization.Because pressurization too early, EVA is mobile also fine, is prone to be extruded; Pressurizeed evening, three-dimensional net structure basically forms, and is little to EVA compact structure property increase effect, and is unfavorable for the bubble discharge that cross-linking reaction produces.
Viscosity can be along with temperature variation when lamination for photovoltaic EVA, and at normal temperatures promptly, EVA is a solid, does not have viscosity.When being heated to uniform temperature to EVA, it is mobile that EVA is obtained in fusion, and curing reaction takes place simultaneously.Along with the carrying out of reaction, degree of crosslinking increases, and EVA loses flowability, and can become solid again, plays encapsulation.Learn thus and just can very important reference frame be provided for laminating technology if know the EVA viscosity-temperature curve.
Having reported at present the mensuration of resin viscosity, mainly is the melting index (MI) of assize fat, and MI is big, represents this resin flow property good, infers that viscosity is little.Though this method fast but just survey the finger that melts under a certain temperature, can not measure viscograph under the temperature variation come, and can not get concrete viscosity number.
Summary of the invention
Technical matters to be solved by this invention is: a kind of EVA of test is provided the method for sticking warm change curve, for the laminating technology laid down by of EVA provides important reference frame
The present invention solves the scheme that its technical matters adopts: the method for the sticking warm change curve of a kind of EVA of test; Adopt temperature scanning under the flow graph earthquake pattern; Deformation and fixed-frequency, viscosimetric are with variation of temperature, and temperature can be that isothermal, constant heatingrate or speed change heat up.
The invention has the beneficial effects as follows:
1. automation mechanized operation, overall cost is lower, is beneficial to quality control;
2. belong to the physics method, directly can obtain whole viscosity variation through measuring, methodological science is reasonable;
3. measuring accuracy is high, can do isothermal, constant heatingrate, speed change intensification, and data are more accurate, and systematic error is little;
4. the present invention can provide important reference frame for the laminating technology laid down by of EVA.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified;
Fig. 1 is the model of temperature scanning under the flow graph earthquake pattern of the present invention;
Fig. 2 is the sticking warm change curve of flow graph of the present invention photovoltaic EVA under the constant heatingrate.
Embodiment
A kind of method of testing the sticking warm change curve of EVA; Come foundation to be provided through EVA viscosity change in the simulation lamination process for the laminating technology parameter setting; It adopts temperature scanning (Temperature Sweep) under the flow graph earthquake pattern (oscillation mode); Model such as Fig. 1, deformation and fixed-frequency, viscosimetric is with variation of temperature.Temperature can be isothermal, constant heatingrate, speed change intensification.
Test result is following:
Under 10 ℃/min heating rate, EVA viscosity changes as shown in Figure 2.As can beappreciated from fig. 2, under the constant heatingrate, A, two kinds of EVA viscosity of B have very big-difference, need the different laminating parameters of adjustment to adapt to the characteristic of different EVA.
Creativeness of the present invention is embodied in: for picture photovoltaic EVA, be that solid also can be thought rubber elastomer under the room temperature, along with heating meeting fusion; Continue heating again curing reaction can take place; Can become solid again, flow graph is to be used for measuring liquid, or semisolid with certain flowability, so survey the viscosity of solid traditionally the time without flow graph; And the method for testing that the present invention adopts is under the pattern of dynamic oscillation; But not the flow pattern that other people adopts when surveying liquid just can change the viscosity that EVA promptly simulates lamination process at whole temperature-rise period testing out, and the viscosity that records is complex viscosity.
Claims (1)
1. test the method that EVA glues warm change curve for one kind, it is characterized in that: adopt temperature scanning under the flow graph earthquake pattern, deformation and fixed-frequency, viscosimetric are with variation of temperature, and temperature can be that isothermal, constant heatingrate or speed change heat up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110163452A CN102331386A (en) | 2011-06-17 | 2011-06-17 | Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110163452A CN102331386A (en) | 2011-06-17 | 2011-06-17 | Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102331386A true CN102331386A (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110163452A Pending CN102331386A (en) | 2011-06-17 | 2011-06-17 | Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760574A (en) * | 2018-04-18 | 2018-11-06 | 晋能光伏技术有限责任公司 | A kind of photovoltaic module encapsulating material fluidity testing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60179631A (en) * | 1984-02-28 | 1985-09-13 | Toyota Motor Corp | Method for evaluating viscosity of kneaded material of ceramic powder and resin |
| CN1065728A (en) * | 1991-03-30 | 1992-10-28 | 上海市电机技术研究所 | Multi-functional paint and resin curing process proving installation |
| CN2357325Y (en) * | 1998-06-26 | 2000-01-05 | 机械工业部广州电器科学研究所 | Measurer for melt viscosity of solid resin |
| CN101915779A (en) * | 2010-07-16 | 2010-12-15 | 常州天合光能有限公司 | Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack |
-
2011
- 2011-06-17 CN CN201110163452A patent/CN102331386A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60179631A (en) * | 1984-02-28 | 1985-09-13 | Toyota Motor Corp | Method for evaluating viscosity of kneaded material of ceramic powder and resin |
| CN1065728A (en) * | 1991-03-30 | 1992-10-28 | 上海市电机技术研究所 | Multi-functional paint and resin curing process proving installation |
| CN2357325Y (en) * | 1998-06-26 | 2000-01-05 | 机械工业部广州电器科学研究所 | Measurer for melt viscosity of solid resin |
| CN101915779A (en) * | 2010-07-16 | 2010-12-15 | 常州天合光能有限公司 | Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack |
Non-Patent Citations (1)
| Title |
|---|
| 郭战胜 等: "先进复合材料用环氧树脂的固化反应和化学流变", 《复合材料学报》, vol. 21, no. 4, 31 August 2004 (2004-08-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108760574A (en) * | 2018-04-18 | 2018-11-06 | 晋能光伏技术有限责任公司 | A kind of photovoltaic module encapsulating material fluidity testing method |
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Application publication date: 20120125 |