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Low-viscosity epoxy acrylate paint for inner wall of food can and preparation method thereof

An epoxy acrylate, low-viscosity technology, used in epoxy resin coatings, coatings, etc., can solve the problems of inability to meet electron beam, low cross-linking density, low coating film hardness, etc., achieve excellent gloss, cross-linking The effect of high density and low viscosity

Active Publication Date: 2013-08-21
武汉工大科技园发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified epoxy acrylate obtained in this way has long molecular chains and low unsaturation, and the cured coating film will have defects such as low hardness and low crosslinking density, and can only be used in the field of UV curing, and cannot meet the requirements of electron beam ( EB) Requirements for curing
Low-viscosity epoxy acrylate fully suitable for electron beam (EB) curing requirements has not been reported in China

Method used

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  • Low-viscosity epoxy acrylate paint for inner wall of food can and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of low-viscosity epoxy acrylate resin with high degree of branching

[0024] a. Add 156.8g (0.4mol) of bisphenol A epoxy resin E-51 and 0.47g of tetrabutylammonium bromide into the reaction vessel, stir and heat up to 100°C, add pentaerythritol: 5.45g (0.04mol), keep temperature and reflux for 2 hours to obtain pentaerythritol epoxy ester;

[0025] b. Take 100g (0.077mol) of the pentaerythritol epoxy ester prepared in step a and cool it down to 85°C, add dropwise 0.5g of tetrabutylammonium bromide, 0.03g of p-hydroxyanisole and 5.69g (0.079mol) of acrylic acid Mixture, control the mixture to be added dropwise within 30 minutes, and react at constant temperature for 4 hours; when the acid value of the system is measured to be ≤5mgKOH / g, cool and discharge to obtain low-viscosity epoxy acrylate;

[0026] (2) Preparation of low-viscosity epoxy acrylate coatings for inner walls of food cans

[0027] Get the low-viscosity epoxy acrylate 100g that makes in t...

Embodiment 2

[0029] a. Add bisphenol A type epoxy resin in the reaction vessel: E-44 156.8g (0.4mol) and catalyst: tetraethylammonium bromide 0.784g, stir and heat up to 100°C, add pentaerythritol: 10.892g (0.08mol ), keep the temperature and condense and reflux for 4 hours; make pentaerythritol epoxy ester;

[0030] b. Take out 100g (0.051mol) of the pentaerythritol epoxy ester prepared in a and cool it down to 85°C, add dropwise a catalyst: 0.8g of tetrabutylammonium bromide, a polymerization inhibitor: 0.05g of p-hydroxyanisole and 3.89g of acrylic acid (0.054mol) of the mixture, the control mixture was added dropwise within 60 minutes, and the constant temperature was reacted for 6 hours; when the system acid value was less than or equal to 5mgKOH / g, cooling and discharging produced low-viscosity epoxy acrylate;

[0031] (2) Preparation of low-viscosity epoxy acrylate coatings for inner walls of food cans

[0032] Get the highly branched low-viscosity epoxy acrylate 100g that makes in...

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Abstract

The invention relates to a low-viscosity epoxy acrylate paint for an inner wall of a food can and a preparation method thereof. The preparation method comprises the following steps: 1) preparation of low-viscosity epoxy acrylate resin: adding bisphenols A epoxy resin and a catalyst into a reaction vessel, stirring and heating, adding pentaerythritol, keeping the temperature and carrying out reflux condensation so as to prepare pentaerythritol epoxy ester; cooling, dropwisely adding a mixture of the catalyst, a polymerization inhibitor and acrylic acid, carrying out a thermostatic reaction, cooling and discharging so as to prepare low-viscosity epoxy acrylate resin; adding a leveling agent and an antifoaming agent, stirring and uniformly mixing so as to obtain the low-viscosity epoxy acrylate paint for the inner wall of the food can. The invention has the following beneficial effects: pentaerythritol epoxy acrylate has a hyper-branched characteristic, has advantages of high degree of unsaturation, low viscosity and good adhesive force, is suitable for electron beam curing, and is non-toxic; and a cured film has properties such as high crosslinking density, excellent glossiness, flexibility, hardness, acid resistance, alkali resistance, water resistance and the like.

Description

technical field [0001] The invention relates to a preparation method of a low-viscosity epoxy acrylate paint for the inner wall of food cans, in particular to a preparation method of a low-viscosity epoxy acrylate paint for the inner wall of food cans which can be used for electron beam curing. Background technique [0002] Food cans usually need to be coated with some kind of coating on their inner surface to prevent the chemical interaction between the contents of the can and the wall of the can and the contamination of the contents by trace harmful substances; to maintain the freshness and original flavor of the contents, so that the cans Food can be stored, transported and sold for a long time without affecting its edible value. Existing can inner wall coatings are mainly heat-bake coatings, which need to be baked at a high temperature of 180-220° C. for 10-20 minutes to be cured, resulting in a large waste of energy. [0003] In recent years, with the improvement of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/10C09D7/12C08G59/62C08G59/17
Inventor 张良均谈伟成沈珍慧张欢雷田刘洋
Owner 武汉工大科技园发展有限公司
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