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Epoxy novolac coating for inner walls of food cans and preparation method of epoxy novolac coating

A technology of epoxy phenolic coatings and cans, which is applied in the direction of epoxy resin coatings, anti-corrosion coatings, coatings, etc., can solve the problems of high corrosion resistance of coating films, and achieve high safety, low energy consumption, and simple production processes Effect

Inactive Publication Date: 2015-02-25
蚌埠飞浦科技包装材料有限公司
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Problems solved by technology

However, the tomato paste in the canned tomato paste not only has strong acid corrosion on the inner wall of the can, but also has a strong corrosion factor, which leads to higher requirements for the corrosion resistance of the coating film, and the strong acid-resistant coatings currently on the market cannot meet the requirements. this request

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  • Epoxy novolac coating for inner walls of food cans and preparation method of epoxy novolac coating

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Embodiment Construction

[0018] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0019] The preparation method of epoxy phenolic paint for food can inner wall of the present invention comprises the steps:

[0020] (1) Synthesis of 6009 epoxy resin: Add 720kg128 epoxy resin, 270kg bisphenol A and 110kg imidazole to a 500L reactor, heat the mixture to 180-190°C for 45-90min, after the reaction, cool and pulverize to obtain 6009 epoxy resin.

[0021] (2) Preparation of 6009 epoxy resin solution: Add 400kg of solid 6009 epoxy resin and 600kg of mixed solvent into a 1000L reactor, heat the mixture to 130°C, reflux and dehydrate for 60min, keep it warm for 2h, and finally cool down to 40°C before discharging Filter to obtain 6009 epoxy resin solution.

[0022] (3) Synthesis of coating: Add 400kg of 6009 epoxy resin solution prepar...

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Abstract

The invention discloses an epoxy novolac coating for the inner walls of food cans and a preparation method of the epoxy novolac coating, and relates to the technical field of food can coatings. The epoxy novolac coating is prepared from the following components in percentage by mass: 40% of 6009 epoxy resin solution, 10% of phenolic resin, 1% of linear epoxy resin and 49% of mixed solvent; the preparation method comprises the following steps: firstly synthesizing solid 6009 epoxy resin from 128 epoxy resin, bisphenol A and a catalyst, secondly adding the mixed solvent to prepare the 6009 epoxy resin solution, and then adding the phenolic resin and the linear epoxy resin to prepare the target coating. The preparation method of the epoxy novolac coating is simple in production procedure, low in energy consumption and low in production cost; tested by the USEPA5021 method, a film sample of the coating contains no methylbenzene and the content of xylene in the film sample is 5.2ppm, and the film sample conforms to standard requirements.

Description

Technical field: [0001] The invention relates to the technical field of food can coatings, in particular to an epoxy phenolic coating for the inner wall of food cans and a preparation method thereof. Background technique: [0002] In recent years, ketchup has become one of the condiments commonly used in people's daily life. However, the tomato paste in the canned tomato paste not only has strong acid corrosion on the inner wall of the can, but also has a strong corrosion factor, which leads to higher requirements for the corrosion resistance of the coating film, and the strong acid-resistant coatings currently on the market cannot meet the requirements. this requirement. [0003] At present, epoxy phenolic coatings are still one of the most widely used coatings for the inner wall of food cans. Its production process is simple and it can be used in a wide range of fields. It is not only suitable for many varieties of food cans, such as acid food cans, fruits and vegetables...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D161/06
CPCC09D163/00C08L2205/03C09D5/08C09D7/20C08L61/06C08L63/00
Inventor 赵小弟
Owner 蚌埠飞浦科技包装材料有限公司
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