CN101915779A - Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack - Google Patents
Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack Download PDFInfo
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- CN101915779A CN101915779A CN2010102292792A CN201010229279A CN101915779A CN 101915779 A CN101915779 A CN 101915779A CN 2010102292792 A CN2010102292792 A CN 2010102292792A CN 201010229279 A CN201010229279 A CN 201010229279A CN 101915779 A CN101915779 A CN 101915779A
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- eva
- crosslinking rate
- battery pack
- vinyl acetate
- solar battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
The invention relates to a test method of the EVA (Ethylene Vinyl Acetate) crosslinking rate of a photovoltaic solar battery pack. The EVA crosslinking rate is represented by gel content. The test method comprises the steps of: testing the crosslinking rate of the EVA of the packet by using a DSA heat flux differential analysis method, measuring the heat flux of the EVA in the process of lamination and carrying out DSC calorimetry analysis by using differential thermal analysis. The calculation method of the EVA (Ethylene Vinyl Acetate) crosslinking rate (gel conten) of the photovoltaic solar battery pack adopts the flowing formula: gel content=(H1-H2)/H1*100%, wherein H1 is heat release of raw material by unit weight, and H2 is heat release of un-crosslinked EVA by unit weight left after lamination. The invention has the advantages of high precision, less error, short test cycle and low cost.
Description
Technical field
The present invention relates to the method for testing of photovoltaic solar industry assembly EVA crosslinking rate.
Background technology
In EVA (ethene-acetate ethylene copolymer) the encapsulation lamination process, chemical reaction can take place in EVA, carries out crosslinked.The crosslinking rate of EVA is generally represented with gel content, the number percent of promptly crosslinked EVA in the EVA total amount.
The photovoltaic solar industry generally adopts the xylene extraction method to carry out the EVA crosslinking rate mensuration of subassembly product at present, but owing to have extraction in the extraction process not exclusively, secondary cross-linking and weighing baking link are more, easily produce influences such as Systematic Errors, often there is very big error in the xylene extraction method, and the crosslinking rate that makes the xylene extraction method measure can be higher more a lot of than actual value.
The weaknesses analysis of xylene extraction method:
1, dimethylbenzene is toxic solution, and the improper use meeting causes poisoning, and pollution is arranged, and security is low.
2, when extraction temperature is lower than the EVA fusing point, as when extracting for 60 ℃, EVA is not fusion as yet, and therefore, rate of extraction is too slow, when extraction finishes, extracts abundant inadequately.
3, when extracting for 110 ℃, the solubleness of EVA in dimethylbenzene is lower, extracts still abundant inadequately.
4, be higher than the EVA crosslinking temperature when temperature, as when extracting for 140 ℃, the dimethylbenzene boiling, EVA solubleness maximum, but EVA might carry out secondary cross-linking in extraction process, influences net result.
5, adopt mesh bag to extract in the extraction, when crosslinking rate own is low, melt, see through the mesh bag slit and dissolve in the dimethylbenzene, cause test inaccurate having the crosslinked EVA of part.
In sum, research and the experiment in the industry at present shows that there is obvious defects in the xylene extraction method, and result that the xylene extraction method obtains and actual result deviation are very big.
Summary of the invention
The technical problem to be solved in the present invention is: incomplete at present xylene extraction, secondary cross-linking and weighing baking link are more, easily produce defectives such as Systematic Errors, the invention provides a kind of method of testing of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of testing of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack, the crosslinking rate of EVA is represented with gel content, described method of testing is: the crosslinking rate that uses DSC hot-fluid differential analytic approach test suite EVA, measure the heat flux of EVA in the lamination process and adopt the principle of differential thermal analysis (DTA) to carry out the DSC thermometric analysis, the crosslinking rate of assembly EVA is that the computing method of gel content are: gel content=(H1-H2)/H1*100%, H1 is the thermal discharge of starting material unit weight, and H2 is the thermal discharge of remaining uncrosslinked EVA unit weight behind the lamination.
DSC (differential scanning calorimetry) places sample under certain atmosphere, changes its temperature or keeps a certain temperature, the energy variation of observing samples.When physical changes such as sample generation fusion, evaporation, crystallization, phase transformations, when perhaps chemical change being arranged, the thermal change information of heat absorption or heating can occur in the collection of illustrative plates, and then infer the characteristic of sample.DSC can be used for accurately measuring phase transformation (Tg, Tm, Tc) and thermal distortion, curing reaction or other chemical change.
When material generation crystallization or when crosslinked, the disorderly degree of material internal reduces, and free energy also drops to than stable status, therefore, when crosslinked or crystallization take place, must be accompanied by themopositive reaction.Therefore, can adopt DSC hot-fluid differential analytic approach to calculate the crosslinking rate of EVA by measuring the heat flux of EVA in the lamination process.
The invention has the beneficial effects as follows:
1. the method for testing of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack of the present invention belongs to the physics method, and directly by measuring hot-fluid change calculations crosslinking rate, method is science more;
2. heat flow measurement precision of the present invention can reach 0.01%, and stability is better, and data are more accurate;
3. compare with the dimethylbenzene method, measurement links such as weighing baking of the present invention are few, and systematic error is littler;
4. avirulence of the present invention, pollution-free, safe;
5. test period of the present invention is short, is beneficial to quality control;
6. automation mechanized operation of the present invention, required personnel are few, and cost of supplementary product is low, and long-term overall cost is lower.
Embodiment
A kind of method of testing of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack, the crosslinking rate of EVA is represented with gel content, its method of testing is: the crosslinking rate that uses DSC hot-fluid differential analytic approach test suite EVA, measure the heat flux of EVA in the lamination process and adopt the principle of differential thermal analysis (DTA) to carry out the DSC thermometric analysis, the crosslinking rate of assembly EVA is that the computing method of gel content are: gel content=(H1-H2)/H1*100%, H1 is the thermal discharge of starting material unit weight, and H2 is the thermal discharge of remaining uncrosslinked EVA unit weight behind the lamination.
When material generation crystallization or when crosslinked, the disorderly degree of material internal reduces, and free energy also drops to than stable status, so, when crosslinked or crystallization take place, must be accompanied by themopositive reaction.Therefore, can adopt DSC hot-fluid differential analytic approach to calculate the crosslinking rate of EVA by measuring the heat flux of EVA in the lamination process.
Claims (1)
1. the method for testing of an EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack, the crosslinking rate of EVA is represented with gel content, it is characterized in that: described method of testing is: the crosslinking rate that uses DSC hot-fluid differential analytic approach test suite EVA, measure the heat flux of EVA in the lamination process and adopt the principle of differential thermal analysis (DTA) to carry out the DSC thermometric analysis, the crosslinking rate of assembly EVA is that the computing method of gel content are: gel content=(H1-H2)/H1*100%, H1 is the thermal discharge of starting material unit weight, and H2 is the thermal discharge of remaining uncrosslinked EVA unit weight behind the lamination.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102292792A CN101915779A (en) | 2010-07-16 | 2010-07-16 | Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack |
| PCT/CN2010/078485 WO2012006837A1 (en) | 2010-07-16 | 2010-11-06 | Method for testing cross-linking rate of ethylene vinyl acetate (eva) in photovoltaic solar battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102292792A CN101915779A (en) | 2010-07-16 | 2010-07-16 | Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack |
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| Publication Number | Publication Date |
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| CN101915779A true CN101915779A (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102292792A Pending CN101915779A (en) | 2010-07-16 | 2010-07-16 | Test method of EVA (Ethylene Vinyl Acetate) crosslinking rate of photovoltaic solar battery pack |
Country Status (2)
| Country | Link |
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| CN (1) | CN101915779A (en) |
| WO (1) | WO2012006837A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331386A (en) * | 2011-06-17 | 2012-01-25 | 常州天合光能有限公司 | Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve |
| CN106940328A (en) * | 2017-02-07 | 2017-07-11 | 中节能太阳能科技（镇江）有限公司 | A kind of method of testing of the photovoltaic module EVA encapsulating material degrees of cross linking |
| CN109142134A (en) * | 2018-07-18 | 2019-01-04 | 凯盛光伏材料有限公司 | A kind of test method of the photovoltaic module POE glue film degree of cross linking |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2975777B1 (en) | 2011-05-26 | 2014-03-14 | Arkema France | PROCESS FOR CHARACTERIZING ETHYLENE COPOLYMER AND VINYL ACETATE |
| DE102012015439A1 (en) * | 2012-08-02 | 2014-02-06 | Institut Für Solarenergieforschung Gmbh | Method and device for laminating objects, in particular solar cells |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1042317A (en) * | 1962-11-15 | 1966-09-14 | Secr Aviation | Methods of determining hydroxyl groups |
| JPS62261052A (en) * | 1986-05-07 | 1987-11-13 | Fujikura Ltd | Pretreatment for measuring degree of crosslinking of crosslinked polyethylene |
| CN101552307B (en) * | 2009-04-24 | 2011-08-24 | 英利能源（中国）有限公司 | Preparation method of solar energy solar panel |
-
2010
- 2010-07-16 CN CN2010102292792A patent/CN101915779A/en active Pending
- 2010-11-06 WO PCT/CN2010/078485 patent/WO2012006837A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331386A (en) * | 2011-06-17 | 2012-01-25 | 常州天合光能有限公司 | Method for testing EVA (ethylene-vinyl acetate) viscosity temperature variation curve |
| CN106940328A (en) * | 2017-02-07 | 2017-07-11 | 中节能太阳能科技（镇江）有限公司 | A kind of method of testing of the photovoltaic module EVA encapsulating material degrees of cross linking |
| CN109142134A (en) * | 2018-07-18 | 2019-01-04 | 凯盛光伏材料有限公司 | A kind of test method of the photovoltaic module POE glue film degree of cross linking |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012006837A1 (en) | 2012-01-19 |
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Application publication date: 20101215 |