CN109884000B - Cross-linking degree test curve fitting formula method and cross-linking degree detection method - Google Patents
Cross-linking degree test curve fitting formula method and cross-linking degree detection method Download PDFInfo
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- CN109884000B CN109884000B CN201910153601.9A CN201910153601A CN109884000B CN 109884000 B CN109884000 B CN 109884000B CN 201910153601 A CN201910153601 A CN 201910153601A CN 109884000 B CN109884000 B CN 109884000B
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Abstract
The invention provides a cross-linking degree test curve fitting formula method and a cross-linking degree detection method, wherein a cross-linking degree calculation formula is obtained by a data set fitting method, so that the cross-linking degree test can be completed within 1 hour, the cross-linking degree detection efficiency is improved, the smooth production completion is facilitated, any toxic and harmful substances cannot be used, the operation risk is zero, and no harm exists.
Description
Technical Field
The invention relates to the technical field of photovoltaic module manufacturing, in particular to a cross-linking degree test curve fitting formula method and a cross-linking degree detection method.
Background
The solar photovoltaic module has a key experimental inspection project in the production process, namely EVA crosslinking degree test, the test project is mainly used for knowing whether the performance of the EVA can meet the process requirement of the photovoltaic module after the EVA is heated and laminated, but the traditional experimental detection method has a long period and can complete the experimental detection process only within 12 hours, once the crosslinking degree result does not meet the requirement, the module produced within 12 hours has hidden quality trouble, and then the parameter is adjusted to perform the crosslinking degree test again, so that the detection process needs at least 12 hours, and the field production can be influenced; in addition, xylene extraction solvents used in conventional cross-linking degree test methods are toxic reagents, which present risks and costs in use and handling.
Therefore, a crosslinking degree detection method is needed to overcome the two disadvantages of toxicity and long detection period in the prior art, which is a difficult problem to be overcome by the technical personnel in the field.
Disclosure of Invention
In view of the above, the present invention provides a cross-linking degree test curve fitting formula method, a formula fitted by the detection method, and a cross-linking degree detection method used in cooperation, and the specific scheme is as follows:
a method for obtaining a cross-linking degree test curve fitting formula comprises the following steps:
s1, taking the same specification experiment sample A and B at the same room temperature, and laminating at the same position of the same laminator;
s2, sending the laminated small sample A into a benzene extraction conventional experiment to obtain a crosslinking degree detection value x, carrying out a light transmittance test on the laminated small sample B to obtain a light transmittance value y, and forming a data set by the benzene extraction crosslinking degree detection value x and the light transmittance value y;
s3: adjusting the laminating time, repeating the steps S1-S2, and after N times of experiments, arranging all data groups according to the sequence of the cross-linking degree detection value a from 0% to 100%;
s4; establishing a curve graph of the sample A and the sample B according to the well-arranged data group obtained in the step S3, and fitting the curve graph to obtain a relational expression of the crosslinking degree detection value x and the transmittance value y, wherein the relational expression is as follows: y = 1.6678x inspection method-2.7919 x2 + 1.5086x + 0.677, R = 0.6386;
specifically, in the step S3, the cross-linking degree detection values are only selected from the range of 20% to 100% and arranged in the order from low to high;
establishing a curve graph of the sample A and the sample B according to the well-arranged data group obtained in the step S3, and fitting the curve graph to obtain a relational expression of the crosslinking degree detection value x and the transmittance value y, wherein the relational expression is as follows: y = -0.0754x + 0.2289x + 0.8396, R = 0.8038.
A cross-linking degree calculation formula specifically comprises: x = -27.766y + 58.614y-29.943, R = 0.8039.
A method of detecting the degree of cross-linking set according to the calculation formula x = -27.766y + 58.614y-29.943, R = 0.8039, comprising the steps of:
s 1: preparing a small sample after EVA crosslinking by using a laminating machine;
s 2: testing the sample of step s1 for a light transmittance value y;
s 3: and (4) calculating to obtain a crosslinking degree value x according to a calculation formula.
The cross-linking degree test curve fitting formula method and the cross-linking degree detection method provided by the invention have the following beneficial effects: 1. the method can complete the test of the crosslinking degree within 1 hour so as to improve the detection efficiency of the crosslinking degree and help the smooth completion of the production. 2. The method does not use any toxic and harmful substances, has zero operation risk and does not have any hazard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a suitable fit using the method of example 1;
FIG. 2 is a good fit using the method of example 2;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
at the same room temperature, taking small samples A and B of experiments with the same specification, laminating at the same position of a laminator, sending the laminated small sample A into a benzene extraction conventional experiment to obtain a crosslinking degree detection value x, testing the light transmittance of the laminated small sample B to obtain a light transmittance value y, forming a data set by the benzene extraction crosslinking degree detection value x and the light transmittance value y, adjusting the laminating time, sequentially increasing the laminating time from 30 seconds, and obtaining 33 data sets:
and (3) establishing a curve graph of the sample A and the sample B by using the appropriate 33 data groups, and fitting the curve graph to obtain a relation formula of a crosslinking degree detection value x and a light transmittance value y, wherein the relation formula is shown in the attached figure 1: y = 1.6678x inspection method-2.7919 x2 + 1.5086x + 0.677, R = 0.6386;
example 2
In the embodiment 1, the crosslinking degree detection value x is only selected from 20% -100% range and arranged in the sequence from low to high, namely the data group with the group number of 21-33, a curve graph of a sample A and a sample B is established, specifically the curve graph shown in the attached figure 2, and the relation between the crosslinking degree detection value x and the transmittance value y obtained by the curve graph fitting is as follows: y = -0.0754x + 0.2289x + 0.8396, R = 0.8038.
The crosslinking degree calculation formula is derived from the formula: x = -27.766y + 58.614y-29.943, R = 0.8039.
According to the method for detecting the degree of cross-linking set by the calculation formula x = -27.766y + 58.614y-29.943, R = 0.8039, includes the steps of:
s 1: preparing a small sample after EVA crosslinking by using a laminating machine;
s 2: testing the sample of step s1 for a light transmittance value y;
s 3: and (4) calculating to obtain a crosslinking degree value x according to a calculation formula.
In order to verify the accuracy of the detection method, 18 sets of comparative tests were performed using three different laminators, and the test data were as follows:
according to the data, the maximum value of the deviation between the cross-linking degree value obtained by calculating the light transmittance and the cross-linking degree value obtained by actually using a xylene method for testing is 6.94%, the average deviation difference is 2.85%, and the method meets the deviation requirement of 7% in the xylene extraction detection method. The deviation result is basically similar to the deviation range of 7% in the xylene test, so the regression equation established by the method can be used as the method for testing the crosslinking degree in actual production.
The whole testing process of the method only needs to test the light transmittance of the crosslinked sample, does not involve the use of any toxic and harmful chemicals, and has zero safety risk; the method is simple to operate, low in requirement on professional knowledge and low in operation threshold, and the test method can be mastered by simple training. And the sample can not be processed for the second time after being manufactured, the cross-linking degree is relatively accurate to test, and the risk of deviation in retest is low. The whole testing process has simple steps, the total time is not more than 1 hour, the influence on the production line is small, if the cross-linking degree is unqualified, the result can be quickly obtained by retesting the cross-linking degree, and the influence on the subsequent production is not caused.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A method of detecting a degree of crosslinking, comprising the steps of:
s 1: preparing a small sample after EVA crosslinking by using a laminating machine;
s 2: testing the sample at step s1 for a light transmission value y;
s 3: calculating a crosslinking degree value x according to a crosslinking degree calculation formula;
the derivation of the cross-linking degree calculation formula comprises the following steps:
s1: at the same room temperature, taking EVA experimental samples A and B with the same specification, and laminating at the same position of a same laminating machine;
s2: sending the laminated small sample A into a benzene extraction conventional experiment to obtain a crosslinking degree detection value x, carrying out a light transmittance test on the laminated small sample B to obtain a light transmittance value y, and forming a data set by the benzene extraction crosslinking degree detection value x and the light transmittance value y;
s3: adjusting the laminating time, repeating the steps S1-S2, and after N times of experiments, arranging all data groups according to the sequence of the cross-linking degree detection value a from 0% to 100%;
s4: establishing a curve graph of the sample A and the sample B according to the arranged data group obtained in the step S3, fitting the curve graph to obtain a relational expression of a crosslinking degree detection value x and a light transmittance value y, calculating a crosslinking degree value according to the obtained relational expression,
the relation is
y = 1.6678x³ - 2.7919x²+ 1.5086x + 0.677，R² = 0.6386，
The cross-linking degree calculation formula is derived from the relation: x = -27.766y + 58.614y-29.943, R = 0.8039.
2. The method of claim 1,
the above step S3 is replaced with: adjusting the laminating time, repeating the steps S1-S2, and after N times of experiments, arranging all data groups in a sequence from low to high in a range of only 20% -100% according to the cross-linking degree detection value;
establishing a curve graph of the sample A and the sample B according to the well-arranged data group obtained in the step S3, and fitting the curve graph to obtain a relational expression of the crosslinking degree detection value x and the transmittance value y, wherein the relational expression is as follows: y = -0.0754x + 0.2289x + 0.8396, R = 0.8038.
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| CN102323243A (en) * | 2011-06-17 | 2012-01-18 | 常州天合光能有限公司 | Structure and method for testing light transmittance of laminated EVA (Ethylene Vinyl Acetate) film used for photovoltaic assembly |
| CN103709296A (en) * | 2013-12-30 | 2014-04-09 | 上海微谱化工技术服务有限公司 | Method for extracting pure ethylene-ethylene vinyl-acetate copolymer |
| CN104347447A (en) * | 2014-09-15 | 2015-02-11 | 阿特斯(中国)投资有限公司 | EVA (ethylene-vinyl acetate copolymer) cross-linking rate test method |
| CN105950038A (en) * | 2016-05-16 | 2016-09-21 | 常州斯威克光伏新材料有限公司 | Transparent EVA (ethylene vinyl acetate copolymer) packaging adhesive film for double-glass assembly |
| 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 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323243A (en) * | 2011-06-17 | 2012-01-18 | 常州天合光能有限公司 | Structure and method for testing light transmittance of laminated EVA (Ethylene Vinyl Acetate) film used for photovoltaic assembly |
| CN103709296A (en) * | 2013-12-30 | 2014-04-09 | 上海微谱化工技术服务有限公司 | Method for extracting pure ethylene-ethylene vinyl-acetate copolymer |
| CN104347447A (en) * | 2014-09-15 | 2015-02-11 | 阿特斯(中国)投资有限公司 | EVA (ethylene-vinyl acetate copolymer) cross-linking rate test method |
| CN105950038A (en) * | 2016-05-16 | 2016-09-21 | 常州斯威克光伏新材料有限公司 | Transparent EVA (ethylene vinyl acetate copolymer) packaging adhesive film for double-glass assembly |
| 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 |
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