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EVA film for packaging solar photovoltaic module and preparation method thereof

A solar photovoltaic and film technology, applied in photovoltaic power generation, adhesives, electrical components, etc., can solve the problems of limited reduction in thermal shrinkage rate of internal stress of EVA film, increased raw material and energy consumption, and inability to achieve results. Achieve the effects of simple online tempering, reduced stretching effect, and low thermal shrinkage

Active Publication Date: 2013-05-08
TIANJIN CAIDA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The EVA film prepared by this invention is made by two-stage calendering, the EVA film can maintain a natural state, will not be deformed due to casting and stretching, and the shrinkage rate of the EVA film is reduced; The calendering process not only increases the floor space, but also increases the consumption of raw materials and energy, and the production efficiency is low. In addition, the elimination of internal stress and the reduction of thermal shrinkage of the EVA film are limited, and the desired effect cannot be achieved.

Method used

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  • EVA film for packaging solar photovoltaic module and preparation method thereof
  • EVA film for packaging solar photovoltaic module and preparation method thereof
  • EVA film for packaging solar photovoltaic module and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Prepare materials

[0033] Prepare materials according to the following weight ratios:

[0034]

[0035]

[0036] 2. Mixed materials

[0037] First, add the coupling agent and cross-linking agent in the prepared materials to the ethylene-vinyl acetate copolymer according to the above weight ratio, and mix them evenly to obtain a primary mixture; and UV absorber are all added into the primary mixture, and mixed evenly to obtain a secondary mixture; finally, the lubricant in the above-mentioned preparation is added to the secondary mixture, and the mixture is uniformly mixed to obtain a mixture;

[0038] 3. Preparation of EVA film

[0039] The prepared mixture is sent to the feeding box of the extruder, and the mixture is heated, melted and kneaded in the extruder to form a melt through the heating of the extruder barrel and the rotation of the screw; the screw will melt The body is transferred to the die and extruded to obtain a film-like extrudate, wherein t...

Embodiment 2

[0045] In addition to preparing materials, prepare materials according to the following weight ratios:

[0046]

[0047]

[0048] In the step of preparing the EVA film, the heating temperature of the extruder barrel is 80°C, the temperature of the mold is 85°C, and the production line speed is 3.5 m / min, the rest are the same as in Example 1, and the thickness of the obtained EVA film is is 0.5mm, and the shrinkage rate is 2.8%.

Embodiment 3

[0050] In addition to preparing materials, prepare materials according to the following weight ratios:

[0051]

[0052] In the step of preparing the EVA film, the heating temperature of the extruder barrel is 85°C, and the temperature of the mold is 85°C, and the rest are the same as those in Example 1. The thickness of the obtained EVA film is 0.30 mm, and the shrinkage ratio is 2.0 %.

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Abstract

The invention discloses an EVA film for packaging a solar photovoltaic module and a preparation method thereof. The preparation method comprises the following steps of adding an anti-oxidant, a light stabilizer, an ultraviolet light absorber, a coupling agent, a crosslinking agent and a lubricant into an ethylene-vinyl acetate copolymer, uniformly mixing to obtain a mixture, putting the mixture into an extruder, heating and mixing the mixture in the extruder to obtain melt, extruding the melt by a mold, and carrying out molding treatment to obtain the EVA film. The EVA film has the advantages of small internal stress, low shrinking percentage, fast production line speed, high production efficiency, small land occupation area, and low energy and raw material consumption.

Description

technical field [0001] The invention relates to the field of encapsulation of solar photovoltaic modules, in particular to an EVA adhesive film for encapsulation of solar photovoltaic modules and a preparation method thereof. Background technique [0002] Solar power generation uses the quantum effect of semiconductors such as silicon to directly convert the visible light of the sun into electrical energy. Since silicon wafers are directly exposed to the atmosphere, their photoelectric conversion function will be attenuated. A thermosetting, elastic and flexible adhesive layer that can withstand atmospheric changes encapsulates the silicon wafer group, and is bonded with the upper protective material glass and the lower protective material TPT (polyvinyl fluoride composite film) to form a solar photovoltaic module (ie solar cell). plate). [0003] Liquid silicone resin and polyvinyl butyral resin sheet (PVB) have been used as packaging and bonding materials in the solar cel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J123/08C09J11/06B29C47/92H01L31/048B29C48/92
CPCY02E10/50B29C48/08
Inventor 祁宏伟
Owner TIANJIN CAIDA NEW MATERIALS TECH CO LTD
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