Easily scattered precoated sand and preparation method thereof

A technology of coated sand and river sand, which is applied in the manufacture of tools, casting molding equipment, metal processing equipment, etc. It can solve the problems of poor collapsibility, difficulty in cleaning sand falling out, increased labor intensity, etc., and achieves easy sand cleaning and excellent collapsibility , Improve the effect of surface quality

Inactive Publication Date: 2014-02-12
TONGLING JINGWEI FLUID SCI & TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, there are also shortcomings, such as poor collapsibility, extr

Method used

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Examples

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Example Embodiment

[0011] A kind of easily collapsible coated sand, made of the following materials (kg): zircon sand 70, river sand 20, montmorillonite 10, novolac resin 3, aniline methyl triethoxy silane 0.8, citric acid Triethyl 5, polyvinyl formal 2, urotropine 12, urea 3, potassium dichromate 2, manganese slag 5, salicylic acid 2, nitrile rubber powder 4, ethylene bis-stearamide 6, Composite powder 4;

[0012] The preparation method of the composite powder is as follows: a. Weigh pyrophyllite, bauxite and volcanic rock in a weight ratio of 5:4:2, mix them evenly, smash through a 200-mesh sieve, and place them in a hydrochloric acid solution with a concentration of 18%, and heat Bring to boiling and grind at high speed for 15 minutes, then adjust the pH of the solution to neutral with 20% sodium hydroxide solution, stir for 6 minutes at 70°C in a water bath, filter, wash the filter residue with distilled water, and dry; b. The powder is beaten with water to make a slurry with a solid conte...

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Abstract

The invention discloses easily scattered precoated sand and a preparation method thereof. The easily scattered precoated sand is prepared from the following raw materials in parts by weight: 60-80 parts of zircon sand, 15-20 parts of river sand, 10-15 parts of montmorillonoid, 2-4 parts of thermoplastic phenolic resin, 0.5-1 part of anilino-methyl-triethoxysilane, 4-6 parts of triethyl citrate, 2-3 parts of polyvinyl formal, 10-15 parts of urotropine, 3-4 parts of urea, 1.5-2.5 parts of potassium dichromate, 4-6 parts of manganese ore slag, 2-3 parts of salicylic acid, 3-5 parts of butadiene-acrylonitrile rubber powder, 4-8 parts of ethylene bis-stearamide and 3-6 parts of composite powder. The precoated sand has excellent scattering property, the sand is easily cleaned after a casting is cooled and is subjected to sand shakeout, an inner cavity is smooth, the labor intensity of cleaning is obviously reduced, and the precoated sand has the characteristics of high strength, high liquidity, high air release amount, high heat resistance, high air permeability and the like. Moreover, the defects of sand adhesion, air holes, cracks and the like in the casting can be overcome, the surface quality of the casting is improved, and the precoated sand is suitable for production of nonferrous metal castings such as aluminum alloys and copper alloys.

Description

technical field [0001] The invention relates to a collapsible coated sand and a preparation method thereof, belonging to the technical field of molding sand. Background technique [0002] Coated sand refers to the molding sand or core sand whose surface is covered with a layer of solid resin film before molding. Coated sand used to make sand cores has the characteristics of simple core-making process, high production efficiency, fast hardening response, small deformation, high precision, no core creep, and long-term use. It is widely used in steel castings, Iron castings. However, there are also shortcomings, such as poor collapsibility, extremely difficult cleaning of falling sand, and increased labor intensity. Therefore, the performance of the existing coated sand must be improved to meet the production needs. Contents of the invention [0003] The purpose of the present invention is to address the deficiencies of the prior art, improve a kind of easily collapsible c...

Claims

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Application Information

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IPC IPC(8): B22C1/00
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH
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