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Pre-coated sand with high strength and low gas evolution rate and preparation method thereof

A high-strength, coated sand technology, used in manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of nitrogen holes, large gas generation, and easy pinholes in castings, achieve good air permeability and improve finished products. The effect of small rate and roughness

Inactive Publication Date: 2014-02-12
TONGLING JINGWEI FLUID SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also shortcomings, such as a large amount of gas generation, and the produced castings are prone to defects such as pinholes and nitrogen pores.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] A high-strength, low-gassing coated sand, made of the following parts by weight of raw materials: quartz sand 70, lapis lazuli 20, wollastonite 10, vinyl tris (β-methoxyethoxy) silane 0.6, pentaerythritol Oleic acid ester 5, epoxy soybean oil 4, nano magnesium oxide 2, bisphenol A epoxy resin 1, thermosetting phenolic resin 1.5, diaminodiphenylmethane 4, urotropine 6, calcium stearate 5, compound 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 4:3:2, mix them evenly, crush them through a 250-mesh sieve, and then place them in a 16% hydrochloric acid solution, and heat Bring to boiling and grind at high speed for 12 minutes, then adjust the pH of the solution to neutral with 18% sodium hydroxide solution, stir for 8 minutes at 65°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...

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PUM

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Abstract

The invention discloses pre-coated sand with high strength and a low gas evolution rate and a preparation method thereof. The pre-coated sand with high strength and low gas evolution rate is prepared from the following raw materials in parts by weight: 60-80 parts of quartz sand, 15-20 parts of celestite, 5-10 parts of wollastonite, 0.4-0.8 parts of ethenyl tri(beta-methoxyethyoxyl) silane, 4-6 parts of pentaerythritol oleate, 3-5 parts of epoxy soybean oil, 2-3 parts of nano magnesium oxide, 0.5-1.5 parts of bisphenol A epoxy resin, 1-2 parts of thermosetting phenol resin, 3-6 parts of diaminodiphenyl methane, 5-10 parts of urotropine, 4-8 parts of calcium stearate and 3-5 parts of composite powder. Compared with the conventional pre-coated sand, the pre-coated sand disclosed by the invention is not only high in strength, good in heat resistance, good in mobility and small in roughness, but also good in gas permeability and low in gas evolution rate, so that a casting piece can be effectively prevented from generating defects such as pin holes, nitrogen gas holes and burnt-on sand, and therefore, the yield of the casting piece is greatly improved.

Description

Technical field [0001] The invention relates to a high-strength low-gassing coated sand and a preparation method thereof, and belongs to the technical field of molding sand. Background technique [0002] Coated sand refers to molding sand or core sand whose surface is covered with a solid resin film before modeling. Coated sand is used to make sand cores. It has the characteristics of simple core-making process, high production efficiency, fast hardening response, small deformation, high precision, no creep of the core, and long-term use. It is widely used in steel castings, Cast iron. However, there are also shortcomings. For example, the amount of gas is large, and the produced castings are prone to defects such as pinholes and nitrogen holes. Therefore, the performance of the existing coated sand must be improved to meet the production requirements. Summary of the invention [0003] The purpose of the present invention is to improve a kind of high-strength, low-gassing coate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00
Inventor 吴寿涛
Owner TONGLING JINGWEI FLUID SCI & TECH
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