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2022
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What are the characteristics of waterborne epoxy resin?
Waterborne epoxy resin Features:
1. Water-based epoxy resins use water as a solvent, making them safer to store and transport;
2. Waterborne epoxy resin has low VOC content, is low in toxicity, and meets environmental protection requirements;
3. Waterborne epoxy resins possess most of the excellent properties of conventional epoxy resins, such as strong adhesion, superior mechanical performance, chemical resistance, and thermal stability.
4. Water-based epoxy resin can be diluted with water in any proportion during use to adjust viscosity without compromising the dilution effect, and it’s easy to clean up after application.
5. Waterborne epoxy resins can crosslink and cure at room temperature and in humid aqueous environments;
6. Waterborne epoxy resin exhibits excellent permeability and adhesion to cement-based substrates, making it compatible for use with cement or cement mortar.
Types of waterborne epoxy resins:
Waterborne epoxy resins include both all-solid-state waterborne epoxy resins and waterborne epoxy emulsions.
Waterborne epoxy emulsions typically refer to water-dispersed systems containing bisphenol A-based epoxy resins with reactive epoxy groups.
Based on the molecular weight of the epoxy resin in the system, waterborne epoxy emulsions are divided into two categories:
1. The epoxy emulsion, after hydration, consists of low-molecular-weight liquid epoxy resin (with an epoxy equivalent weight of approximately 190). Type I waterborne epoxy emulsion exhibits excellent adhesion to a wide range of substrates.
2. Type II waterborne epoxy emulsion, after hydration, consists of high-molecular-weight solid epoxy resin (with an epoxy equivalent weight of approximately 500). Type II waterborne epoxy emulsion exhibits excellent adhesion, corrosion resistance, and flexibility.
Several common methods for epoxy resin hydration:
1. Mechanical method—direct emulsification. This process involves grinding epoxy resin using equipment such as ball mills, colloid mills, or homogenizers. Under specific process conditions and with the aid of an emulsifier, a water-based emulsion is prepared.
2. The external emulsification method involves adding an emulsifier to epoxy resin, which essentially triggers a phase transformation of the continuous small-molecule emulsion—from an oil phase to a water phase.
There are two common forms:
One approach involves using a polyamine-based aqueous epoxy curing agent that simultaneously functions as both a curing agent and an emulsifier.
Second, add an emulsifier to hydrate the epoxy resin, then incorporate the waterborne epoxy curing agent.
However, excessive use of emulsifiers can also affect the water resistance of waterborne epoxy resins.
Above is my take on Waterborne epoxy resin Insights into our features—contact our company if you’d like to learn more.
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