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Preparation method of 3D printing rapid-prototyping precoated sand

A technology of 3D printing and coated sand, which is applied in the direction of casting molding equipment, casting molds, cores, etc., can solve the problem that the accuracy, strength and durability of blanks cannot meet the requirements of functional parts, and affect laser sintering rapid prototyping materials or molding The quality of the parts is not conducive to the promotion of the industrialization of laser sintering rapid prototyping technology, etc., to achieve the effect of easy industrial production, low production cost and stable properties

Inactive Publication Date: 2015-12-30
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, although there are many researches on new laser sintering rapid prototyping materials in China, most of them are limited to the research on the molding process and parts performance of existing materials, and the precision, strength and durability of the blanks are far from satisfactory. requirements for functional parts, and there is no specialized rapid prototyping material manufacturer
This situation not only affects the quality of laser sintering rapid prototyping materials or molded parts, but also is not conducive to the industrialization of laser sintering rapid prototyping technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Baozhu sand pretreatment: After washing Baozhu sand with water, soak it in an aqueous solution of cetyltrimethylammonium bromide with a concentration of 1.5% by mass, leave it at room temperature for 13 hours, filter it, and wash it with water to medium properties, drying, to obtain pretreated pearl sand;

[0027] (2) Preparation of coated sand for 3D printing rapid prototyping: In a mixer, add separately, pretreated pearl sand: 92g, thermoplastic polyimide: 2g, phenolic resin 4g, bisphenol A dianhydride: 1.0g, monohard Fatty acid glycerin: 1.0g, turn on the mixer at 120 rpm, grind for 30 minutes, add 10 mL of acetone, turn on the grinder at 120 rpm, grind for 30 minutes, and dry to obtain 3D printing rapid prototyping coated sand.

Embodiment 2

[0029] (1) Pearl sand pretreatment: After washing the pearl sand with water, soak it in an aqueous solution of cetyltrimethylammonium bromide with a concentration of 1.0% by mass, leave it at room temperature for 16 hours, filter it, and wash it with water to medium properties, drying, to obtain pretreated pearl sand;

[0030](2) Preparation of coated sand for rapid prototyping of 3D printing: In a blender, add separately, pretreated pearl sand: 89g, thermoplastic polyimide: 5g, phenolic resin 5g, bisphenol A dianhydride: 0.5g, monohard Fatty acid glycerin: 0.5g, turn on the mixer at 120 rpm, grind for 30 minutes, add 12 mL of acetone, turn on the grinder at 120 rpm, grind for 30 minutes, and dry to obtain 3D printing rapid prototyping coated sand.

Embodiment 3

[0032] (1) Baozhu sand pretreatment: After washing Baozhu sand with water, soak it in an aqueous solution of cetyltrimethylammonium bromide with a concentration of 2.0% by mass, leave it at room temperature for 10 hours, filter it, and wash it with water to medium properties, drying, to obtain pretreated pearl sand;

[0033] (2) Preparation of coated sand for 3D printing rapid prototyping: In a mixer, add separately, pretreated pearl sand: 95g, thermoplastic polyimide: 2g, phenolic resin 2g, bisphenol A dianhydride: 0.4g, monohard Fatty acid glycerol: 0.6g, turn on the mixer at 120 rpm, grind for 30 minutes, add 11 mL of acetone, turn on the grinder at 120 rpm, grind for 30 minutes, and dry to obtain 3D printing rapid prototyping coated sand.

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Abstract

The invention discloses a preparation method of 3D printing rapid-prototyping precoated sand. The method is characterized by comprising the steps that 1, fused ceramite is washed with water, soaked in a water solution with hexadecyl trimethyl ammonium bromide mass percentage concentration being 1-2%, filtered, washed with water to be neutral and dried to obtain pretreated fused ceramite; 2, by mass, 89-94% of pretreated fused ceramite, 2-5% of thermoplastic polyimide, 2-5% of phenolic resin, 0.4-1.0% of bisphenol A type dianhydride, 0.4-1.0% of glyceryl monostearate and acetone are added into a stirring machine, a grinding machine is started to rotate by 120 turns per minute, the mixture is ground for 30 min and then dried, and therefore the 3D printing rapid-prototyping precoated sand is obtained. The precoated sand can be directly molded under laser sintering, and has the advantages that the preparation process is simple, the conditions are easy to control, the production cost is low, and industrial production is easy to achieve.

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 3D printing rapid prototyping coated sand. Background technique [0002] Orb sand, also known as fused ceramsite, is an advanced substitute for quartz sand. 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 casting precision is low; second, the sand sticking on the surface of the casting is serious, and sand cleaning is difficult. 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 spot concentration) serious sand sticking, cleaning is very dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 李慧芝卢燕赵淑英
Owner UNIV OF JINAN
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