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Non-ionic epoxy emulsifier, preparation method thereof and waterborne epoxy emulsion

An epoxy emulsifier, non-ionic technology, applied in the field of new materials, can solve the problems of poor emulsion stability, shortened service life and high cost, achieve high practical application value, increase number average molecular weight, and improve stability Effect

Pending Publication Date: 2022-01-04
AFCONA CHEM HAIMEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tertiary amines are often used as accelerators for curing epoxy resins, resulting in the inevitable problem of shortening the pot life of water-based epoxy emulsions prepared with this emulsifier.
CN112409558A etc. add isocyanate as cross-linking agent, add hydroxyl-containing compound to lose isocyanate again, to improve the emulsification stability of emulsifying agent, this method has many steps in the preparation process, and the polymerization reaction controllability between multifunctional groups is poor, resulting in product structure are widely distributed and costly
It has been found through practice that the product structure of the emulsifier obtained according to the preparation method disclosed in the patent CN104558524A is relatively complex, the self-emulsifying ability needs to be improved, the proportion of low molecular weight is relatively high, the amount of water required for phase inversion is large, and the stability of the final prepared emulsion is insufficient. good

Method used

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  • Non-ionic epoxy emulsifier, preparation method thereof and waterborne epoxy emulsion
  • Non-ionic epoxy emulsifier, preparation method thereof and waterborne epoxy emulsion
  • Non-ionic epoxy emulsifier, preparation method thereof and waterborne epoxy emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] According to the mass ratio of epoxy resin (E-20) to polyethylene glycol (PEG-4000) is 1:3.8 (epoxy value: hydroxyl value = 1:1), epoxy resin (E-20) and butyl acetate The mass ratio of the ester is 1:1, and the mass of the catalyst boron trifluoride etherate is 0.3% of the mass of the epoxy resin to prepare the emulsifier.

[0094] Step 1. Raw material pretreatment: boron trifluoride diethyl ether complex is treated with 4A molecular sieve; PEG-4000 uses toluene reflux to remove water; E-20 uses toluene reflux to remove water, and the mass ratio of E-20 is 1:1 Mix with butyl acetate to form E-20 dilution.

[0095] Step 2. Add the treated boron trifluoride etherate complex, the treated PEG-4000 and butyl acetate into a four-necked flask equipped with a condenser tube, a thermometer, a mechanical stirrer and a constant pressure dropping funnel, and heat up to 100°C at N 2 The raw materials were fully dissolved under protection, and then the temperature was lowered to 80...

Embodiment 2

[0113] Basically with embodiment one, the only difference is that the consumption of catalyst is 0.2%.

Embodiment 3

[0115] Basically with embodiment one, the only difference is that the consumption of catalyst is 0.4%.

[0116] Taking the normalized differential refractive index signal (Normalized RI) as the ordinate, the molecular weight logarithm (Log 10 M) plotted as abscissa as Figure 4 The curve shown.

[0117] Figure 4 It shows that when the amount of catalyst in the reaction system is 0.2%, the catalytic effect is not ideal, and PEG-4000 does not react with epoxy resin to generate high molecular weight products; when the amount of catalyst is 0.3% and 0.4%, the PEG-4000 The peaks were significantly attenuated and high molecular weight material was produced. If the molecular weight of the emulsifier increases with the amount of catalyst, the molecular weight of the emulsifier should be the largest when the amount of catalyst is 0.4%. However, the molecular weight of the emulsifier and its distribution diagram showed that the molecular weight of the product did not increase furth...

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Abstract

The invention provides a non-ionic epoxy emulsifier, a preparation method thereof and a waterborne epoxy emulsion. In order to solve the problems of low molecular weight and poor emulsifying effect of the non-ionic epoxy emulsifier prepared by the existing process, the invention provides the preparation method of the non-ionic epoxy emulsifier. The preparation method comprises the steps of mixing polyethylene glycol, a catalyst and part of a solvent to obtain a mixed solution; mixing the epoxy resin and the residual organic solvent to obtain an epoxy resin diluent; dropwise adding the epoxy resin diluent into the mixed solution, and carrying out heat preservation reaction to obtain a reaction solution; and removing the catalyst and the solvent in the reaction liquid through reduced pressure distillation. The content of free polyethylene glycol in a system can be effectively reduced by improving a synthesis process, a raw material ratio and the like, a series of high-molecular-weight epoxy resin emulsifiers are synthesized by investigating the influence of a catalyst removal mode, the synthesis process and the raw material ratio on a product structure, and the non-ionic epoxy emulsifier has the advantages of good emulsifying performance, less toxicity, less pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a nonionic epoxy emulsifier, a preparation method thereof and an aqueous epoxy emulsion. Background technique [0002] Traditional solvent-based coatings will release a large amount of volatile organic compounds (Volatile Organic Compounds, VOCs for short) during the construction process, which will have a serious impact on human health and environmental sanitation (Progress inOrganic Coatings.2020,142(5):1- 13). Therefore, the development and use of environmentally friendly coatings is bound to become a hot spot in the industry. Waterborne epoxy coatings have the advantages of non-toxicity, low VOCs, non-flammability and low transportation costs, and are the first choice for environmentally friendly coatings. [0003] Epoxy resins are polymers with alicyclic, aliphatic or aromatic chain segments as the backbone and two or more epoxy groups in the molecule. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62C08J3/03C08L63/02
CPCC08G59/62C08J3/03C08J2363/02
Inventor 王志军
Owner AFCONA CHEM HAIMEN
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