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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 problems of short construction time, poor wettability, adhesion and salt spray resistance of existing self-emulsifying epoxy emulsion

Method used

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  • Preparation method of waterborne epoxy emulsion

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[0018] The invention provides a kind of preparation method of aqueous epoxy emulsion, comprises the following steps:

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

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

Embodiment 1

[0029] (1) Accurately weigh 6 grams of E51 epoxy resin in the formula and add it to the three-necked bottle, then add 5 grams of polyethylene glycol ether and 0.01 gram of triphenylphosphine to the three-necked bottle successively, stir evenly and heat to 30 ° C for 7 Hour;

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

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

Embodiment 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, then add 20 grams of polyethylene glycol ether ether and 5 grams of polyglycol ether to the three-necked bottle successively Stannous octoate, stirred evenly and then heated to 120°C for 5 hours;

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

[0035] (3) Cool down to 80°C, add 25 grams of water to emulsify to obtain a water-based 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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