Preparing method for fast forming epoxy resin coated sand used for 3D printing

Abstract

The invention discloses a preparing method for fast forming epoxy resin coated sand used for 3D printing. The preparing method is characterized in that 3-aminopropyl triethoxy silane is adopted to treat the surface of fused ceramite to obtain pretreated fused ceramite; 77-82% of pretreated fused ceramite, 3-7% of epoxy resin, 0.3-1.0% of melamine and 0.3-1.0% of fatty acid amide are added into a stirrer by mass; the stirrer is started to grind the materials for 10 min at the rotating speed of 200 r / min, then 10-15% of acetone by mass is added, the sum of the mass ratios of all the component is 100%, the stirrer is started at the rotating speed of 200 r / min to perform grinding for 20 min, and the fast forming epoxy resin coated sand used for 3D printing is obtained through drying. The coated sand can be directly formed on the condition of laser sintering and has the advantages that the preparing technology is simple, conditions are easy to control, the production cost is low, and industrial production is easy to realize.

Description

technical field [0001] The invention relates to a preparation method of coated sand, which belongs to the field of rapid prototyping materials, in particular to a preparation method and application of epoxy resin coated sand for 3D printing rapid prototyping. Background technique [0002] Epoxy resins generally refer to organic compounds containing two or more epoxy groups in their molecules. Except for a few, their relative molecular weights are not high. The molecular structure of epoxy resin is characterized by active epoxy groups in the molecular chain, and the epoxy groups can be located at the end, middle or ring structure of the molecular chain. Due to the active epoxy groups in the molecular structure, they can undergo cross-linking reactions with various types of curing agents to form insoluble polymers with a three-way network structure. All polymer compounds containing epoxy groups in their molecular structure are collectively referred to as epoxy resins. The cu...

AI Technical Summary

Problems solved by technology

The advantages of quartz sand are wide distribution and low cost; but its disadvantages are also quite obvious: first, the expansion coefficient is large, and the precision of the casting is low;

The reason is that quartz will produce a variety of isomorphic crystals at different temperatures, and the volume changes greatly; limited by the refractoriness (the refractoriness of quartz sand is between 1400-1700°C), the local parts of the casting (holes, Groove, and hot spots concentrated) serious sand sticking, cleaning is very difficult

The above shortcomings are particularly serious in the production of large steel castings