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Preparation method of 3D printing precoated sand and made 3D printing precoated sand

A technology of 3D printing and coated sand, applied in the field of coated sand, can solve the problem that the strength of coated sand is difficult to meet, and achieve the effects of increasing strength, efficient use of atoms, and improving fluidity

Active Publication Date: 2018-07-20
LIUZHOU LIUJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional coated sand, 3D printed coated sand has high requirements in terms of flow performance, strength, and compressive capacity of coated sand. Ordinary coated sand can no longer meet the requirements of current 3D printing technology. The need for the performance of coated sand materials
In this application, the resin binder and the quartz sand are connected by intermolecular forces, and the strength of the prepared coated sand is difficult to meet the needs of some 3D printing products

Method used

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  • Preparation method of 3D printing precoated sand and made 3D printing precoated sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of 3D printing coated sand is characterized in that it comprises the following steps:

[0027] (1) Preparation of raw sand: After mixing quartz sand, silica sand, and chromite sand in a mass ratio of 8:6:4, soak them in an acid solution with a mass fraction of 70% at 180°C for 24 hours, and filter out the sand particles. Calcined in a high-temperature furnace at 1000°C for 8 hours, then cooled to room temperature, and sieved to obtain raw sand;

[0028] (2) Raw sand modification: add raw sand, titanate coupling agent, and dibutyltin diacetate into the mixer at a mass ratio of 100:3:0.3, and stir for 30 minutes at a temperature of 150°C and a stirring speed of 600rpm Take it out to obtain the first mixture, then add 120 parts of the first mixture, 15 parts of the first binder and 2 parts of stearic alcohol into the mixer, stir at 250 °C and 800 rpm for 60 minutes, and then add 5 parts of the first binder and 10 parts of the second binder were stirre...

Embodiment 2

[0033] A preparation method of 3D printing coated sand is characterized in that it comprises the following steps:

[0034] (1) Preparation of raw sand: After mixing quartz sand, silica sand, and chromite sand in a mass ratio of 6:6:3, soak them in an acid solution with a mass fraction of 80% at 180°C for 20 hours, and filter out the sand particles. Calcined in a high-temperature furnace at 1200°C for 6 hours, then cooled to room temperature, and sieved to obtain raw sand;

[0035](2) Raw sand modification: Add raw sand, silane coupling agent, and stannous octoate into the mixer at a mass ratio of 120:5:0.2, stir at 140°C and 800rpm for 20 minutes, and then take it out to obtain For the first mixture, add 100 parts of the first mixture, 12 parts of the first binder and 2 parts of stearic acid amide into the mixer, stir for 75 minutes at a temperature of 240 ° C and a stirring speed of 600 rpm, and then add 3 parts of the first mixture One binder and 8 parts of the second binde...

Embodiment 3

[0040] A preparation method of 3D printing coated sand is characterized in that it comprises the following steps:

[0041] (1) Preparation of raw sand: After mixing quartz sand, silica sand, and chromite sand in a mass ratio of 8:5:4, soak them in an acid solution with a mass fraction of 90% at 200°C for 25 hours, and filter out the sand particles. Calcined in a high-temperature furnace at 1200°C for 5 hours, then cooled to room temperature, and sieved to obtain raw sand;

[0042] (2) Raw sand modification: Add raw sand, titanate coupling agent, and dibutyltin di(dodecylsulfide) into the mixer at a mass ratio of 100:3:0.2, and heat the mixture at 150°C and 700rpm Stir at the stirring speed for 30 minutes and then take it out to obtain the first mixture, then add 120 parts of the first mixture, 15 parts of the first binder and 1 part of ricinoleic acid phthalimide into the mixer, at a temperature of 250°C and a stirring speed of 700rpm After stirring at low temperature for 70 ...

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Abstract

The invention relates to a preparation method of 3D printing precoated sand and the made 3D printing precoated sand. The precoated sand is prepared through the following steps that quartz sand, silicasand and chromite sand are mixed, and are calcined in a high temperature furnace after being soaked with an acid solution, and crude sand is obtained through cooling; the crude sand, a coupling agentand a catalytic agent are added into a material mixer, a first mixture is obtained after high-speed stirring, then the first mixture, a first adhesion agent and a lubricating agent are added into thematerial mixer, the first adhesion agent and a second adhesion agent are replenished after high-speed stirring, then stirring is performed, and modified crude sand is obtained through cooling and screening; and the modified crude sand, a high temperature resistant agent, a toughening agent, a lubricating agent and a curing agent are stirred after being mixed in a sand mixer, screening is performed after cooling, and then the 3D printing precoated sand is obtained. According to the preparation method of the 3D printing precoated sand and the made 3D printing precoated sand, the acrylate type adhesion agents are used for modifying the crude sand, the crude sand and the adhesion agents are made to be connected through chemical bonds, the strength of the precoated sand is improved, the precoated sand can be used for making products high in strength requirement, and the applicable range of the 3D printing precoated sand is widened.

Description

technical field [0001] The invention relates to the field of coated sand, in particular to a method for preparing 3D printed coated sand and the prepared 3D printed coated sand. Background technique [0002] Coated sand is an essential raw material for casting molds. It is sand particles covered with a layer of resin sand or core sand before molding. 3D printing is a process in which the coated sand is superimposed layer by layer and solidified by laser firing to form it. Compared with traditional coated sand, 3D printed coated sand has high requirements in terms of flow performance, strength, and compressive capacity of coated sand. Ordinary coated sand can no longer meet the requirements of current 3D printing technology. The need for the performance of coated sand materials. In the patent with the publication number CN105215281A, a preparation method for 3D printing quartz coated sand is provided, which is prepared by pretreating the quartz sand and then adding epoxy re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22B22C1/02B33Y70/00
CPCB22C1/02B22C1/2206B33Y70/00
Inventor 任文强
Owner LIUZHOU LIUJING TECH CO LTD
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