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Adhesive for solar back panel and preparation method thereof

A technology for solar backsheets and adhesives, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problem that the yellowing resistance of adhesives cannot meet the use requirements, high solvent content in adhesives, and unfavorable environmental protection and other problems, to achieve the effect of reducing the amount of solvent, high peel strength retention rate, and low yellowing value

Active Publication Date: 2014-02-26
CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, in order to achieve the above effect, the Chinese patent ZL201110135564 discloses an adhesive with good adhesive properties; however, the adhesive system tends to produce quinone structure during the process of damp heat aging and ultraviolet aging, which leads to Shows obvious yellowing; especially when coating and compounding on substrates with high transparency, the long-term yellowing resistance of the adhesive cannot meet the requirements of use; and the high solvent content of the adhesive is not conducive to environmental protection

Method used

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  • Adhesive for solar back panel and preparation method thereof
  • Adhesive for solar back panel and preparation method thereof

Examples

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preparation example Construction

[0044] The invention also discloses a preparation method of an adhesive for a solar back panel, comprising the following steps:

[0045] a. Synthesis of polyester polyols:

[0046] a1 After adding isophthalic acid, sebacic acid, azelaic acid and octadecanedibasic fatty acid into the reactor, add neopentyl glycol, hexanediol and butylene glycol into the reactor, and stir under nitrogen protection And be heated up to 220 ℃ to react;

[0047] a2 Stop nitrogen flow and carry out polycondensation reaction with products with an acid value ≤ 20mgKOH / g, raise the temperature of the reactor to 230°C, and gradually vacuumize until the vacuum degree is -0.09—-0.1MPa, and the vacuum reaction time is 2 -4h;

[0048] a3 obtaining a polyester polyol with a molecular weight of 5000-10000, a hydroxyl value of 15-30 mgKOH / g, and an acid value of ≤2 mgKOH / g;

[0049] b. Preparation of adhesive system:

[0050] The polyester polyol of b1 step a3 is the main agent, adding an organic solvent to...

Embodiment 1

[0055] The solar backboard adhesive of this embodiment, the adhesive is prepared by weight percentage from polyester polyol, isocyanate curing agent, organic solvent and auxiliary agent, and the solid content is 45%;

[0056] In this example, the molecular weight of the polyester polyol is 10000, which ensures that the system still has very good processing fluidity when the present invention is used at a high solid content; the hydroxyl value is 20 mgKOH / g, and the acid value is ≤ 2 mgKOH / g;

[0057] In this embodiment, the isocyanate curing agent is an aliphatic or alicyclic isocyanate compound or its multimer; it greatly improves and ensures the heat and humidity resistance and yellowing performance of the adhesive system;

[0058] In the present embodiment, the isocyanate curing agent is hexamethylene diisocyanate, hexamethylene diisocyanate trimer or isophorone diisocyanate; the present embodiment selects hexamethylene diisocyanate trimer, of course , choose above-mentione...

Embodiment 2

[0078] The adhesive for the solar backboard of this embodiment, the adhesive is prepared by weight percentage from polyester polyol, isocyanate curing agent, organic solvent and auxiliary agent, and the solid content is 60%;

[0079] Wherein, by weight: polyester polyol: isocyanate curing agent = 5:1—15:1; in this embodiment, it is 5:1;

[0080] In this example, the molecular weight of the polyester polyol is 5000, which ensures that the system still has very good processing fluidity when the present invention is used at a high solid content; the hydroxyl value is 15 mgKOH / g, and the acid value is ≤2 mgKOH / g;

[0081] In this embodiment, the isocyanate curing agent is an aliphatic or alicyclic isocyanate compound or its multimer; it greatly improves and ensures the heat and humidity resistance and yellowing performance of the adhesive system;

[0082] In this embodiment, the isocyanate curing agent is hexamethylene diisocyanate, hexamethylene diisocyanate trimer or isophorone ...

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Abstract

The invention discloses an adhesive for a solar back panel and a preparation method thereof. The adhesive is prepared from polyester polyols, an isocyanate curing agent, an organic solvent and assistants in percentage by weight, and the solid content of the adhesive is 20% to 60%, wherein the weight ratio of the polyester polyols to the isocyanate curing agent is (5:1) to (15:1). According to the adhesive for the solar back panel and the preparation method of the adhesive, a reasonable raw material ratio is adopted, so that the adhesive has the advantages of good resistance to hygrothermal environment aging and ultraviolet (UV) environment aging and good processing fluidity; after aging for 3,000 hours at the temperature of 85 DEG C and the RH (Relative Humidity) of 85% or aging for 72 hours under PCT (Pressure & Concentration & Temperature) conditions, good aging resistance and a high peel strength retention ratio are shown, the yellowing value is very low, and the use of back panels is not affected, so that the adhesive is particularly applicable to translucent-substrate solar back panels; after being subjected to UV irradiation for 3,000 hours, the adhesive has a high peel strength retention ratio and a lower yellowing value; and furthermore, the adhesive also has good processing fluidity and can be used in a high solid content manner, and the consumption of the solvent is reduced, thereby being beneficial to environmental protection.

Description

technical field [0001] The invention relates to an auxiliary substance for new energy utilization and a preparation method thereof, in particular to an adhesive for solar back panels and a preparation method thereof. Background technique [0002] The solar backsheet is located on the back of the solar panel, which protects and supports the battery sheet, and generally needs to have reliable insulation, water resistance, and aging resistance. In order to achieve the above effects, solar backsheets generally have a multi-layer structure, which respectively perform functions such as insulation, water resistance, corrosion resistance, and support strength; due to the multi-layer structure and the above functions, it has high adhesive properties. requirements. [0003] Since the solar backplane needs to be used for a long time (up to 25 years), its structure is required to have long-term weather resistance to ensure the service life of the battery. Therefore, the adhesive used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C08G18/42C08G63/181
Inventor 栾国栋吕新坤江林
Owner CHONGQING YUNTIANHUA HIGH END NEW MATERIALS DEV CO LTD
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