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Ethylene-vinyl acetate copolymer, its preparation method, and solar cell encapsulation sheet using the same

A technology of vinyl acetate and solar cells, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of lower formation temperature, increased defect rate, and lower sheet productivity, and achieve increased cross-linking speed and high cross-linking rate , Excellent weather resistance and thermal stability

Active Publication Date: 2021-09-21
HANWHA TOTAL ENERGIES PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of organic peroxides showing low decomposition temperature has the disadvantage that the sheet forming temperature will be lowered to prevent the decomposition of organic peroxides during sheet formation, which may reduce sheet productivity due to the generation of air bubbles during lamination While the defect rate increases, and the increased amount of residual crosslinker after lamination may cause defects such as high yellowing index
However, the proposed attempts still cannot solve the problems associated with the fast cross-linking reaction

Method used

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  • Ethylene-vinyl acetate copolymer, its preparation method, and solar cell encapsulation sheet using the same
  • Ethylene-vinyl acetate copolymer, its preparation method, and solar cell encapsulation sheet using the same
  • Ethylene-vinyl acetate copolymer, its preparation method, and solar cell encapsulation sheet using the same

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preparation example Construction

[0036] In the production method of the EVA copolymer resin according to the present invention, a polymerization initiator including two or more peroxide polymerization initiators is preferably added at a concentration of 1000 to 3000 ppm. If the concentration of the polymerization initiator is less than 1000 ppm, the reaction temperature during polymerization is low, undesirably resulting in low conversion to EVA copolymer resin and making molecular weight control difficult. If the concentration of the polymerization initiator is greater than 3000ppm, the reaction temperature during the polymerization is very high, which may decompose the resin, and the decomposition of vinyl acetate will generate acetic acid, which may damage the reaction radicals, which undesirably damages the safety issue.

[0037] In the preparation method of the EVA copolymer resin according to the present invention, specific examples of alkyl peroxyneodecanoate compounds (A) suitable for use as initiators...

Embodiment 1

[0076] In the first reaction stage, 72% by weight of ethylene monomer and 28% by weight of vinyl acetate monomer are injected into the reactor, and tert-butyl peroxyneodecanoate (TBND), tert-butyl peroxypivalate (TBPV) and tert-butyl peroxy-2-ethylhexanoate (TBPO) were mixed in a weight ratio of 45:30:25, and the resulting mixture was injected into the reactor as a radical initiator. In the second reaction stage, tert-butyl peroxyneodecanoate (TBND), tert-butyl peroxypivalate (TBPV) and tert-butyl peroxy-2-ethylhexanoate (TBPO) were mixed in a ratio of 10:20 : Mixed at a weight ratio of 70, weighed 2000ppm of the resulting mixture relative to ethylene monomer and vinyl acetate monomer, and then used a high temperature pump to continuously inject it into the reactor. including 2650kg / cm 2 The EVA copolymer resin was prepared under the conditions of the polymerization pressure, the polymerization temperature of 230° C. and the polymerization time of 4 minutes. As determined by...

Embodiment 2

[0078] In the first reaction stage, 72% by weight of ethylene monomer and 28% by weight of vinyl acetate monomer are injected into the reactor, and tert-butyl peroxyneodecanoate (TBND), tert-butyl peroxypivalate (TBPV), tert-butyl peroxy-2-ethylhexanoate (TBPO) and tert-butyl peroxy-3,5,5-trimethylhexanoate (TBPIN) in a weight ratio of 40:30:25:5 ratio and inject the resulting mixture into the reactor as a free radical initiator. In the second reaction stage, tert-butyl peroxyneodecanoate (TBND), tert-butyl peroxypivalate (TBPV), tert-butyl peroxy-2-ethylhexanoate (TBPO) and peroxy- tert-butyl 3,5,5-trimethylhexanoate (TBPIN) was mixed in a weight ratio of 10:20:60:10, and the resulting mixture was weighed at 2000 ppm relative to ethylene monomer and vinyl acetate monomer, and then used The high temperature pump continuously injects it into the reactor. including 2650kg / cm 2 The EVA copolymer resin was prepared under the conditions of the polymerization pressure, the polyme...

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Abstract

The invention relates to an ethylene-vinyl acetate (EVA) copolymer resin, a method for preparing it, and a solar cell encapsulation sheet using the same. More particularly, the present invention relates to EVA copolymer resins for solar cell encapsulation sheets, wherein the high molecular weight (HMW) component fraction (F HMW ) and low molecular weight (LMW) component fraction (F LMW ) are less than 10% and less than 40%, respectively.

Description

[0001] cross reference [0002] This application claims the priority and benefit of Korean Patent Application No. 10-2017-0136867 filed in the Korean Intellectual Property Office on October 20, 2017, and all rights derived therefrom under 35 U.S.C. 119, the entire contents of which are incorporated by reference into this article. technical field [0003] The present invention relates to an ethylene-vinyl acetate (EVA) copolymer resin prepared using a polymerization reactor, a preparation method thereof, and a solar cell encapsulation sheet using the same. More particularly, the present invention relates to a resin having an increased crosslinking speed during lamination for manufacturing a solar cell module and a method for preparing the same, as compared with general EVA copolymer resins. Background technique [0004] In solar cell modules used in photovoltaic power generation, EVA sheets are usually used on both sides of the cell to protect the cell. In addition, a trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F218/08C08L51/06
CPCC08F255/026C08L51/06C08L2201/08C08L2203/206C08F218/08Y02E10/50C08F2/44C08K5/14C08L23/0853C08L2203/162H01L31/0481H01L31/049
Inventor 韩在爀张喜贞刘珍雅崔昶铉朴智溶
Owner HANWHA TOTAL ENERGIES PETROCHEMICAL CO LTD
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