Preparation method of waterborne epoxy emulsion

A water-based epoxy emulsion and epoxy resin technology, which is applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of short construction time, poor wettability, adhesion and salt spray resistance of self-emulsifying epoxy emulsion and other problems, to achieve the effect of good film density and improved adhesion

Active Publication Date: 2018-11-30
BEIJING JINHWEILI APPLIED CHEM PROD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention proposes a preparation method of water-based epoxy emulsion, aiming to solve the pro

Method used

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  • Preparation method of waterborne epoxy emulsion

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Example Embodiment

[0018] The present invention provides a method for preparing an aqueous epoxy emulsion, which includes the following steps:

[0019] (1) Put an appropriate amount of epoxy resin into the reaction vessel, and then sequentially add polyether and catalyst to the reaction vessel, stir evenly, heat to 30-150°C and keep for 1-7 hours. Preferably, the heating temperature in step (1) is 40-120°C, and the holding time is 2-5 hours. In specific implementation, the epoxy resin in the formula can be divided into two parts and added to the reaction vessel. The weight of each part can be determined according to the actual situation. For example, you can first take 6-45 parts of epoxy resin from the formula and put it in the reaction vessel. Into the reaction vessel and react with other raw materials. Through step (1), a hydrophilic group is provided, so that the epoxy resin is water-based and the flexibility of the epoxy resin is improved.

[0020] (2) Add the remaining epoxy resin to the abov...

Example Embodiment

[0028] Example 1

[0029] (1) Accurately weigh 6 grams of E51 epoxy resin in the formula and add it to a three-necked bottle, and then add 5 grams of polyethylene glycol ether and 0.01g of triphenylphosphine to the three-necked bottle in turn, stir well and heat to 30℃ to keep warm 7 hour;

[0030] (2) Continue to add the remaining 44 grams of E51 epoxy resin in the formula, stir evenly, add 0.1 grams of phosphoric acid at 30°C, stir again, and keep it warm for 6 hours;

[0031] (3) Cool down to 25°C, add 20 grams of water to emulsify to obtain a water-based epoxy emulsion.

Example Embodiment

[0032] Example 2

[0033] (1) Accurately weigh the mixture of 45 grams of E51 epoxy resin and bisphenol F epoxy resin (NPEF170) in the formula and add it to the three-necked bottle, and then add 20 grams of polyglycol ether ether and 5 grams to the three-necked bottle. Stannous octoate, stir well and heat to 120°C for 5 hours;

[0034] (2) Continue to add the remaining mixture of 20 grams of E51 epoxy resin and bisphenol F epoxy resin (NPEF170) in the formula, stir evenly, add 10 grams of phosphoric acid at 120°C, stir again, and keep it warm for 5 hours;

[0035] (3) Cool down to 80℃, add 25g of water to emulsify to obtain waterborne epoxy emulsion

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Abstract

The invention provides a preparation method of a waterborne epoxy emulsion. The preparation method comprises following steps: 1, an appropriate amount of epoxy resin is introduced into a reaction container, polyether and a catalyst are introduced into the reaction container, an obtained mixture is stirred to be uniform, is heated to 30 to 150 DEG C, and is subjected to thermal insulation for 1 to7h; 2, the left epoxy resin is introduced into the reaction container, an obtained mixed material is stirred to be uniform, at 30 to 150 DEG C, phosphoric acid is added, uniform stirring is carried out, and thermal insulation is carried out for 0.5 to 6h; and 3, an obtained product is cooled to 25 to 100 DEG C, water is added for emulsification so as to obtain the waterborne epoxy emulsion. The waterborne epoxy emulsion is high in film forming compactness; epoxy groups with relatively high activity are maintained, and room temperature solidification is realized under cooperation effect with acuring agent; introduction of phosphoric acid is capable of increasing the clunging force between the waterborne epoxy emulsion and a base material, and improving the salt spray resistance of the waterborne epoxy emulsion.

Description

technical field [0001] The invention relates to the technical field of anticorrosion materials, in particular to a method for preparing a water-based epoxy emulsion. Background technique [0002] With the development of technology, more and more resins are water-based. Epoxy resin has good acid resistance, alkali resistance, salt spray resistance and other properties, and is widely used. Self-emulsifying epoxy emulsion is easy to use and has good comprehensive performance, which has attracted people's attention. [0003] Epoxy emulsions contain active epoxy groups, and can be cured at room temperature with amine curing agents, but the construction time is relatively short, and most of them only have a pot life of less than 4 hours. In addition, compared with solvent-based epoxy resins, water-based epoxy emulsions have poor wettability to substrates, poor adhesion, and poor salt spray resistance. Contents of the invention [0004] In view of this, the present invention p...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08C09D7/65C08G59/14
CPCC08G59/1422C08L2205/025C08L2205/03C09D5/08C09D163/00C08L71/02C08L63/00
Inventor 程建军秦文
Owner BEIJING JINHWEILI APPLIED CHEM PROD
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