Novel waterborne epoxy curing agent production process

Abstract

The invention provides a production process of a novel waterborne epoxy curing agent. The novel waterborne epoxy curing agent is prepared from the following raw materials in parts by weight: 0.075-0.225 part of triethylene tetramine, 0.14-0.42 part of polypropylene glycol diglycidyl ether, 0.04-0.12 part of Nanya 128 resin, 0.015-0.045 part of diethylene glycol mono-methyl ether, 0.001-0.03 part of a waterborne defoaming agent and 0.229-0.687 part of tap water. According to the method, harmful waste treatment is not needed, the process is simpler, only two-step reaction is carried out, and the production process is adjusted to be carried out for two days, so that the reaction in each stage is carried out completely, and the epoxy conversion rate is high enough; in addition, the production process is adjusted to be carried out in two days, so that the reaction in each stage is carried out completely, the epoxy conversion rate is high enough, meanwhile, the reaction heat in the first stage can be completely released, the reaction in the second stage is not influenced, and the gel scrap risk caused by overlarge reaction heat is avoided; the curing agent finished product produced by the method is low in viscosity, good in mixing performance with resin and high in emulsification width.

Description

technical field [0001] The invention relates to the production of a self-emulsifying non-ionic water-based epoxy curing agent, in particular to a production process of a novel water-based epoxy curing agent. Background technique [0002] At present, there are two common production processes for non-ionic self-emulsifying water-based epoxy curing agents: [0003] 1. First react the mixture of triethylenetetramine (TETA) and (PM) with polyether polyol diglycidyl ether (DGEPG) at a molar ratio of 2.2:1 at 65°C for 4 hours, and then continue at 65°C Next, the input metering ratio is that the epoxy resin continues to react for 3 hours, the solvent PM is distilled off, and distilled water is added until the solid content is 50-55%, to obtain a self-emulsifying epoxy resin curing agent. [0004] 2. First react with triethylenetetramine (TETA) and polypropylene glycol diglycidyl ether (PPDGDE) in a molar ratio of 2.2:1, then add 40% epoxy resin E20 to further extend the chain, and ...

AI Technical Summary

Problems solved by technology

[0005] However, there are some problems in the production process of the above two non-ionic self-emulsifying water-based epoxy curing agents: 1. It needs to be reacted in a solvent environment with a low flash point, and the solvent needs to be distilled out later, and hazardous waste treatment needs to be carried out, and Need to increase the capping reaction process, increase production risk, cost and process slightly complicated

2. In the actual mass production process, the reaction heat is not easy to control, especially in the reaction stage with the resin, which requires high cooling equipment, and the self-reaction heat is too high, which is prone to side reactions, and there is a risk that the product will be scrapped due to explosive gelation