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A kind of preparation method of waterborne modified epoxy resin

An epoxy resin, water-based modification technology, applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problem that the usage rate of environmentally friendly coatings is less than 50%, the activity of phthalic anhydride is low, water resistance, resistance to Salt water reduction and other problems, to achieve ideal anti-corrosion and anti-rust performance, good storage stability, excellent water resistance effect

Active Publication Date: 2019-10-29
山东奔腾漆业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the annual output of coatings in my country has exceeded 16 million tons, and the utilization rate of environmentally friendly coatings is less than 50%.
From the actual experimental results, it can be seen that the activity of phthalic anhydride is too low to be connected to epoxy resin; although trimellitic anhydride is highly active, it is necessary to add a large amount of trimellitic anhydride to achieve the acid value required to make the epoxy ester resin water soluble , when the addition of trimellitic anhydride reaches a certain value, due to the effect of steric hindrance, it is difficult to connect trimellitic anhydride to the epoxy resin in the later stage, resulting in muddy resin, water resistance and salt water resistance; maleic anhydride can be connected to oleic acid On the double bond of the epoxy resin, but in the case of high temperature, the maleic anhydride and the hydroxyl group on the epoxy resin have a ring-opening effect, which increases the viscosity of the resin and deteriorates the water solubility of the resin.

Method used

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  • A kind of preparation method of waterborne modified epoxy resin
  • A kind of preparation method of waterborne modified epoxy resin
  • A kind of preparation method of waterborne modified epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 100g of epoxy resin A, 100g of epoxy resin B and 206.4g of cardanol into a four-necked bottle, raise the temperature to 200-220°C, keep it warm for 3 hours, until the acid value is ≤0.5mgKOH / g, cool down, Product I is obtained;

[0023] (2) Add a mixture of 35g of acrylic acid and 0.8g of benzoyl peroxide to the product I, heat up to 100-120°C, keep warm for 2-4 hours, the acid value is 61.8mgKOH / g, cool down to obtain the product II;

[0024] (3) Add 15.5g of n-butanol, 124.2g of ethylene glycol monobutyl ether and 49g of triethylamine to the product II, stir for 15min, the viscosity is: 23S / (Grignard*25°C), and obtain the product III;

[0025] (4) Add 200 g of water to the product III to obtain a water-based modified epoxy resin with a solid content of 50 wt%.

[0026] Various properties of water-based modified epoxy resin coating film:

[0027]

Embodiment 2

[0029] (1) Weigh 120g of epoxy resin A, 100g of epoxy resin B and 214g of cardanol into a four-necked bottle, raise the temperature to 200-220°C, keep it warm for 3 hours until the acid value is ≤0.5mgKOH / g, cool down to obtain Product I;

[0030] (2) Add a mixture of 37g of acrylic acid and 0.9g of benzoyl peroxide to product I, heat up to 100-120°C, keep warm for 2-4 hours, the acid value is 61.2mgKOH / g, cool down to obtain product II;

[0031] (3) Add 22.4g of n-butanol, 179.2g of ethylene glycol monobutyl ether and 52g of triethylamine to the product II, stir for 15min, the viscosity is: 25S / (Grignard*25°C), and obtain the product III;

[0032] (4) Add 220 g of water to the product III to obtain a water-based modified epoxy resin with a solid content of 50 wt%.

[0033] Various properties of water-based modified epoxy resin coating film:

[0034]

[0035]

Embodiment 3

[0037] this experiment

[0038] (1) Weigh 150g of epoxy resin A, 100g of epoxy resin B and 232g of cardanol into a four-necked bottle, raise the temperature to 200-220°C, keep it warm for 3 hours, until the acid value is ≤0.5mgKOH / g, cool down to get Product I;

[0039] (2) Add a mixture of 41g of acrylic acid and 1g of benzoyl peroxide to the product I, heat up to 100-120°C, keep it warm for 2-4 hours, the acid value is 61.1mgKOH / g, cool down to obtain the product II;

[0040] (3) Add 25g of n-butanol, 199g of ethylene glycol monobutyl ether and 57.5g of triethylamine to the product II, stir for 15min, the viscosity is: 30S / (Grignard*25°C), and obtain the product III;

[0041] (4) Add 240 g of water to the product III to obtain a water-based modified epoxy resin with a solid content of 50 wt%.

[0042] Comparative experiment 1

[0043] (1) Weigh 150g of epoxy resin A, 100g of epoxy resin B, 232g of linolenic acid, 0.3g of zinc oxide and 25g of refluxing xylene and add them...

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Abstract

The invention discloses a preparation method of waterborne modified epoxy resin. The preparation method comprises the following steps that epoxy resin A and epoxy resin B are mixed according to a certain mass ratio and then subjected to a ring-opening reaction with cardanol at the temperature of 200 DEG C to 220 DEG C to obtain a product I, the product I reacts with vinyl acid monomers at the temperature of 100 DEG C to 120 DEG C to obtain a product II with a certain acid value, a cosolvent and a neutralizing agent are added into the product II to obtain a product III, water is added, and then the waterborne modified epoxy resin can be obtained. The waterborne modified epoxy resin prepared through the preparation method has the excellent water resistance, saline resistance, salt spray resistance and the like, has more advantages compared with existing waterborne epoxy ester sold on the market, can be widely applied to anti-corrosion and anti-rust paint product for a metal substrate and has the advantages of being little in odor, excellent in atomizing property, good in levelling property, convenient to construct and the like.

Description

technical field [0001] The invention belongs to the technical field of water-based coatings, in particular to a preparation method of water-based modified epoxy resin. Background technique [0002] At present, the annual output of coatings in my country has exceeded 16 million tons, and the utilization rate of environmentally friendly coatings is less than 50%. Water-based coatings are environmentally friendly coatings with water as the main medium. Compared with traditional solvent-based coatings, water-based coatings can reduce VOC emissions by 60% to 70%, which has obvious environmental protection and social benefits. Therefore, the development of water-based coatings is not only in line with national policies, but also crucial to the future development of enterprises. [0003] At present, commercially available water-based epoxy ester resins generally use oleic acids with high iodine value such as dehydrated ricinoleic acid and linolenic acid. Although the water-based e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/62C08G59/17C09D163/10C09D5/08
CPCC08G59/1466C08G59/1494C08G59/62C09D5/08C09D163/10
Inventor 邵瑞峰杨艾马新杨树民
Owner 山东奔腾漆业股份有限公司
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