Anti-vein precoated sand and preparation method thereof

A technology of film-coated sand and veining, which is applied in manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problem of veining on the surface of castings, and improve the quality of the inner and outer surfaces of the castings, good air permeability, and heat resistance. good effect

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

Problems solved by technology

However, there are also shortcomings. The coated sand is prone to vei

Method used

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Embodiment Construction

[0011] An anti-veining coated sand, made of the following raw materials by weight (kg): quartz sand 85, ilmenite sand 15, spodumene 12, boric acid 2.5, thermoplastic phenolic resin 2, thermosetting phenolic resin 1, cement cooked Material 8, pulp waste liquid 5, corn flour 4, squash gum 2, ammonium benzoate 1.5, γ-aminopropyltriethoxysilane 0.6, dioctyl phthalate 4, urotropine 9, hard Calcium alginate 3, composite powder 4;

[0012] The preparation method of described composite powder is as follows: a, weigh pyrophyllite, bauxite and volcanic rock by weight ratio 3:2:1 and mix uniformly, pulverize through 200 mesh sieves, then place concentration and be in the hydrochloric acid solution of 15%, heating Boil and grind at high speed for 10 minutes, then adjust the pH of the solution to neutrality with 16% sodium hydroxide solution, stir for 8 minutes at 60°C in a water bath, filter, wash the filter residue with distilled water, and dry; b. Add water and beat the powder to m...

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Abstract

The invention discloses anti-vein precoated sand and a preparation method thereof. The anti-vein precoated sand is prepared from the following raw materials in parts by weight: 80-90 parts of quartz sand, 15-25 parts of menaccanite, 10-15 parts of spodumene, 2-3 parts of boric acid, 2-3 parts of thermoplastic phenolic resin, 0.5-1 part of thermosetting phenol resin, 5-10 parts of cement clinker, 4-7 parts of sulphite liquor, 3-5 parts of corn flour, 2-3 parts of sesbania gum, 1-2 parts of ammonium benzoate, 0.5-0.8 part of gamma-aminopropyl triethoxy silicane, 3-6 parts of dioctyl phthalate, 7-11 parts of urotropine, 2-4 parts of calcium stearate and 3-5 parts of composite powder. The anti-vein precoated sand has strong anti-sand burning and anti-vein capacities, also has the characteristics of high strength, good liquidity, low gas evolution, good heat resistance, good gas permeability and the like, can obviously reduce or eliminate defects of vein, sand burning, pores and the like, effectively improves quality of the inner surface and the outer surface of a casting and is applicable to production of a gray iron bulb iron steel casting.

Description

technical field [0001] The invention relates to anti-veining 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. The coated sand is prone to veining defects on the surface of the casting during the casting process. Therefore, the performance of the existing coated sand must be improved to meet the production needs. Contents of the invention [0003] The object of the present invention is to improve a kind of anti-veining coated sand and its preparation method aiming at the def...

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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