Preparation method of high-strength centrifugal casting precoated sand

A centrifugal casting, high-strength technology, applied to casting molding equipment, casting molds, cores, etc., can solve the problems of low glass sand strength, difficult regeneration of old sand, waste of old sand, etc., to achieve simple preparation process and prevent sand sticking Defects, life-prolonging effect

Inactive Publication Date: 2020-11-20
和县华顺铸造有限公司
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Problems solved by technology

Chinese patent CN201410728742.6 Centrifugal casting process of ultra-low temperature ductile iron castings discloses that when centrifugal casting coated sand is molded, water glass sand is used to disperse into the rotary centrifugal casting mold, but CO 2 Gas-hardened sodium silicate sand has low strength, high water content, and easy moisture absorption: poor hardn

Method used

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  • Preparation method of high-strength centrifugal casting precoated sand

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Embodiment 1

[0024]The first step, preparation of polyphosphazene derivatives: Under vacuum conditions, hexachlorocyclotriphosphazene was melt-polymerized at 250°C for 48 hours, washed with dry petroleum ether for 3 times after cooling, and dried in vacuum to obtain polydichlorophosphazene Take 69 parts of polydichlorophosphazene, dissolve in tetrahydrofuran, take 48 parts of 2,2,2-trifluoroethanol and 130 parts of 2,2,3,3-tetrafluoropropanol, and dissolve them in tetrahydrofuran with excess metal sodium React at room temperature until bubbles are no longer generated, weigh 28.8 parts of sodium hydride and 88 parts of p-hydroxybenzaldehyde in tetrahydrofuran for 12 hours at room temperature, and pour the sodium salt solution of trifluoroethanol and octafluoropentanol into poly In dichlorophosphazene solution, react at 30°C for 12h, then add 4-formaldehyde sodium phenoxide, reflux for 120h, precipitate the product in deionized water for 3 times, precipitate in petroleum ether twice, and dry ...

Embodiment 2

[0027] The first step, preparation of polyphosphazene derivatives: Under vacuum conditions, hexachlorocyclotriphosphazene was melt-polymerized at 240°C for 36 hours, washed twice with dry petroleum ether after cooling, and dried in vacuum to obtain polydichlorophosphazene Take 69 parts of polydichlorophosphazene, dissolve in tetrahydrofuran, take 54 parts of 2,2,2-trifluoroethanol and 125 parts of 2,2,3,3-tetrafluoropropanol, and dissolve excess metal sodium in tetrahydrofuran React at room temperature until bubbles are no longer generated, weigh 28.8 parts of sodium hydride and 88 parts of p-hydroxybenzaldehyde in tetrahydrofuran for 12 hours at room temperature, and pour the sodium salt solution of trifluoroethanol and octafluoropentanol into poly Dichlorophosphazene solution, reacted at 25°C for 8 hours, then added 4-formaldehyde sodium phenoxide, refluxed for 100 hours, precipitated the product twice in deionized water, twice in petroleum ether, and dried in vacuum for 24 h...

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Abstract

The invention discloses a preparation method of high-strength centrifugal casting precoated sand and belongs to the technical field of casting materials. The high-strength centrifugal casting precoated sand prepared through the preparation method is low in gas evolution amount requirement and low in gas evolution speed, and has the characteristics of high temperature resistance, high strength, lowexpansion, low gas evolution, slow gas evolution, easy collapsibility, oxidation resistance, heat resistance and the like. The high-temperature-resistant precoated sand is formed by centrifugal slurry coating and precoating of a polyphosphazene derivative, polydivinyl acetylene and poly-2,6-dibromophenyl ether in the presence of a polymerization catalyst and a curing accelerator, the preparationmethod is simple and convenient, raw materials are wide in source, and the prepared centrifugal casting precoated sand with excellent high-temperature performance and comprehensive casting performanceis suitable for being applied to casting of seamless steel tubes, roller ways, cylinder sleeves, rollers, bearing bushes and the like.

Description

technical field [0001] The invention belongs to the technical field of casting materials, in particular to a preparation method of high-strength centrifugal casting coated molding sand. Background technique [0002] Centrifugal casting coated sand is suitable for centrifugal casting process and can be used to produce castings such as centrifugal casting pipes. According to the material, diameter and technical requirements of the casting pipe, it can be processed into centrifugal casting coated sand with different properties. Different from other kinds of coated sands, the requirement for gas generation is low and the gas generation speed is slow. In the past, resin sand should use thermosetting phenolic resin coated sand, and its thickness on the mold is 2~4.5mm. The amount of resin used is 2%~4% of the amount of sand, the amount of hardener (urotropine) is 10%~15% of the amount of resin, the particle size of the original sand (natural silica sand) is 5 groups, and the mud...

Claims

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Application Information

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IPC IPC(8): B22C1/02
CPCB22C1/02
Inventor 刘榄
Owner 和县华顺铸造有限公司
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