Production method of sulfoacid firming agent for casting sand mold ink-jet printing resin

Abstract

The invention relates to a production method of a firming agent, and in particular relates to a production method of a sulfoacid firming agent for casting sand mold ink-jet printing resin. The production method is characterized by comprising the following steps: turning off a discharging valve at the bottom of a reaction kettle, starting a power supply, turning on a methylbenzene feeding valve, sequentially adding methylbenzene and anhydrous sodium sulfate, starting a stirrer, and meanwhile slowly adding concentrated sulfuric acid; after feeding materials, raising temperature and refluxing; preserving the reaction temperature and removing 10-25 parts of water, subsequently turning on a methylbenzene recovery valve, turning off a reflux valve, adding de-ionized water, and decreasing temperature when methylbenzene is recovered to 40-96 parts; when the temperature of material liquid is reduced to 70 DEG C, refilling the de-ionized water which is evaporated when evaporating methylbenzene; when the temperature of the material liquid is reduced to 40 DEG C, sampling and inspecting, and discharging materials after the materials are qualified. The method disclosed by the invention is unique, the corrosion of the firming agent can be remarkably weakened, the technological requirements of the firming agent for 3D resin are achieved, the rate of a sulfonation reaction is improved and a sulfurizing defect on casting surface is remarkably relieved.

Description

technical field [0001] The invention relates to a production method of a curing agent, in particular to a production method of a sulfonic acid curing agent for casting sand mold inkjet printing resins. Background technique [0002] Rapid prototyping, also known as 3D printing, is divided into many different technologies according to different printing processes, which are applied in various industries. The general process of 3D sand mold rapid printing is: catalyst or curing agent, mixed with sand in advance, which requires high sand, the roller lays a very thin layer of sand on the printing table in advance, and then the inkjet head, many inkjet heads are densely distributed , the binder is dispersed on the sand layer to be hardened in the form of tiny droplets, and the catalyst in the sand catalyzes the curing of the binder to bond the sand together. The unbindered sand remains loose and can still serve as a support surface for the next layer. The above-mentioned process...

AI Technical Summary

Problems solved by technology

Due to many unresolved technical problems in the printing process of large castings, only a large foundry in China is trying to apply 3D printing casting technology, and its supporting inkjet sand printing casting resin requires extremely low viscosity, good fluidity, and fast Hardening, rapid mold release after printing. At present, there are no relevant reports on this type of resin and its supporting curing agent in China.