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High-cohesiveness fluorocarbon coating and application

A fluorocarbon coating, high-adhesion technology, applied in polymer adhesive additives, non-polymer adhesive additives, adhesives, etc., can solve the problem of poor adhesion, poor adhesion, and poor weather resistance of adhesives. To achieve the effect of bonding durability, excellent weather resistance, and excellent adhesion

Inactive Publication Date: 2016-10-12
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the mainstream products of backsheets include composite type (TPT, KPK) and coated type. Due to the high manufacturing cost of composite type backsheets, and the fluorine film as the adhesive layer has poor adhesion to EVA, and there is also a combination of glue and polyester. The ester support is bonded and prone to aging and peeling after heat and humidity treatment
[0004] Patent CN105097971 A makes the fluorocarbon resin and the EVA in the packaging material have good adhesion through the addition of a functional coupling agent. The fluorocarbon coating described in this patent only has a fluorocarbon resin and a curing agent other than the functional coupling agent. It can ensure the reflectivity of the inner coating, and after high-temperature and high-humidity aging treatment, the yellowing is relatively large and the adhesion is poor. At the same time, the curing agent contains aromatic isocyanate, which further increases the yellowing and affects the weather resistance and appearance of the backplane.
The techniques described in patents JP-A No. 2006-152013 and JP-A No. 2003-060218 can improve the initial adhesion between the sealing material and the backsheet, but have poor durability in a relatively high-temperature and high-humidity environment
Patent CN 102792462 A uses polyolefins, polyesters, acrylic polymers and polyurethanes as adhesives, and adds inorganic fine particles to form an adhesive layer coated on the surface of polyester supports, which improves the performance of backplanes and sealing materials in hot and humid environments. Durability, but the adhesive described in it has poor weather resistance and serious yellowing after aging, which cannot meet the 25-year service life of the backsheet outdoors
Patent CN 105102228 A sets a laminated film on a polyester support. The laminated film has a two-layer structure. The first layer is a modified polyolefin resin of a copolymer of ethylene, (meth)acrylate and acid anhydride, and the second layer is a modified polyolefin resin. The layer is an olefin resin, which effectively has both the adhesion to EVA and the adhesion to the polyester support, but its manufacturing process is complicated and the requirements are high. The thickness of the laminated film is as low as 0.05 μm, and industrial production has certain challenge

Method used

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  • High-cohesiveness fluorocarbon coating and application

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preparation example Construction

[0025]The preparation steps of the B component are as follows: Weigh 15-35 parts by weight of anhydrous diluent B and pour it into a sand mill, and add 35-50 parts by weight of fluorocarbon resin to the diluent B under low-speed stirring. 15 parts by weight of modified polyolefin, 0.2 to 2 parts by weight of wetting and dispersing agent, 5 to 25 parts by weight of inorganic filler A, after pre-dispersion, milled to a particle size of ≤5 microns, as required in the coating composition Use optional additives, although not necessary, such additives include 0.1 to 2 parts by weight of catalyst, 0 to 0.5 parts by weight of leveling agent, 0 to 15 parts by weight of polyester resin, 0 to 20 parts by weight of inorganic filler B, mechanically mixed uniformly , add an appropriate amount of anhydrous diluent A as needed to adjust the viscosity to 500-2000mPa·S, filter to obtain component A, and store it in a dry and sealed container for later use.

[0026] The high-bonding fluorocarbon...

Embodiment 1

[0058] Preparation of component A: 55g (155.81mmol NCO group) isophorone diisocyanate (IPDI) trimer Z4470BA (37.5% NCO content, Bayer, Germany) and 20g anhydrous xylene (Hangzhou Chemical Reagent Co., Ltd.) Mix evenly with 25g of anhydrous butyl acetate (Hangzhou Chemical Reagent Co., Ltd.), filter to make component A, and store in a dry sealed tank for use.

[0059] Preparation of component B: Put 15g of methyl ethyl ketone (Hangzhou Chemical Reagent Co., Ltd.) in a container, and add 50g (49.1mmol OH group) of fluorocarbon resin ZHM-2 (Dongfu Chemical Industry Co., Ltd.) and 2g of modified poly Olefin CHEMIPEARLS (trade name, manufactured by Mitsui Chemicals, Inc.), 0.65g wetting and dispersing agent BYK-163 (Germany BAK Chemical Co., Ltd.), 15g titanium dioxide (Shanghai Hongyunyuan Chemical Co., Ltd.) and 5g titanate couple Calcium carbonate (Shanghai Hongyunyuan Chemical Co., Ltd.) treated by the joint agent is pre-dispersed and then ground with a sand mill until the part...

Embodiment 2

[0062] Preparation of component A: 50g (233.5mmol NCO group) hexamethylene diisocyanate trimer curing agent HT-90BS (NCO content is 19.6%, Wanhua Chemical Group Co., Ltd.) and 20g anhydrous toluene (Hangzhou Chemical Reagent Co., Ltd.) and 30g of anhydrous ethyl acetate (Hangzhou Chemical Reagent Co., Ltd.) were mixed evenly, filtered to make component A, and stored in a dry sealed tank for use.

[0063] Preparation of component B: Put 10g of ethyl acetate (Hangzhou Chemical Reagent Co., Ltd.) and 25g of propylene glycol methyl ether acetate (PMA) (Kunshan Chengxin Chemical) into a container, and add 35g (37.49mmolOH group) of fluorine successively under low-speed stirring Carbon resin GK570 (Dakin in Japan), 15g modified polyolefin S-75N (manufactured by Mitsui Chemicals, Inc.), 3g fluorocarbon resin DESMOPHEN1652 (Bayer, Germany), 1.2g wetting and dispersing agent BYK-9010 (Germany than Gram Chemical Co., Ltd.), 25g of BHS8860 talcum powder treated with fluorosilane coupling...

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Abstract

The invention discloses a high-bonding fluorocarbon paint, which is used as a bonding layer of a solar cell backboard. The fluorocarbon coating is composed of components A and B, wherein component A contains an isocyanate curing agent as a crosslinking agent; component B includes fluorocarbon resin, modified polyolefin, modified by functional coupling agent Inorganic filler A. In the present invention, the inorganic filler treated with the functional coupling agent acts as a "bridge" at the interface between the bonding layer and EVA, effectively improving the bonding force between the coating and EVA; at the same time, the modification introduced by the bonding layer Polyolefins exhibit excellent adhesion to corona-treated polyester supports containing polar groups on the surface. The fluorocarbon coating adhesive layer prepared by the present invention can simultaneously take into account the adhesiveness with the packaging material and the polyester support body, has high peel strength with the packaging material, good adhesion, and has durable adhesion in humid heat and light environments and excellent weather resistance, and can be prepared at low cost.

Description

technical field [0001] The invention relates to a coating, in particular to a fluorocarbon coating suitable for preparing a coated solar battery back plate and improving the adhesion between packaging materials and the back plate. Background technique [0002] The application of solar energy is mainly to convert it into electrical energy through solar cell modules and utilize it. It does not emit carbon dioxide during power generation and has a small environmental burden. It is a representative of green energy. At present, in a conventional solar cell module, the solar cell unit is sandwiched between the front glass on the sunlight incident side and the so-called back sheet placed on the opposite side (back side), wherein, between the front glass and the solar cell unit and the sun The battery cells and the back plate are respectively sealed with packaging materials (usually ethylene-vinyl acetate copolymer (EVA) resin). In order to achieve a 25-year service life of the sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/04C09J11/08H01L31/049
CPCY02E10/50C09J175/04C08K3/04C08K3/26C08K3/34C08K3/36C08K9/04C08K9/06C08K13/06C08K2003/265C09J11/04C09J11/08H01L31/049C08L91/06
Inventor 李景菲林维红郑炯洲周光大林建华
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD