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Preparation method of anti-fracturing adsorbent precoated sand

A technology of coated sand and adsorption type, which is applied to casting molding equipment, casting molds, cores, etc., can solve the problems of low fracturing resistance and poor adsorption, and achieve improved fracturing resistance, improved adsorption, and improved compatibility effect

Inactive Publication Date: 2018-06-19
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention: Aiming at the defects of poor adsorption and low fracturing resistance of ordinary coated sands at present, a preparation method of anti-fracturing adsorption coated sands is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025]Mix the ferric chloride solution with a concentration of 2.4mol / L and the sodium hydroxide solution with a concentration of 6mol / L in an equal volume ratio and stir for 12 minutes. After the stirring is completed, let it stand for 6 minutes, then pour it into an evaporating dish, and place the evaporating dish Put it in an oven and dry it at 100°C for 6 hours. After drying, take it out, scrape off the upper hard shell, and put the hard shell, iron slime and activated carbon into the kiln according to the mass ratio of 1:2:3. In the furnace, calcined at a temperature of 240 ° C for 2 hours to obtain a modified mixture; polystyrene, tetraethyl orthosilicate and deionized water were mixed in a beaker at a mass ratio of 2:1:3, and under nitrogen protection Stir for 20 minutes to get the stirrer, then mix the stirrer, sodium lauryl sulfate, silane coupling agent KH-560 and ammonium persulfate into a beaker according to the mass ratio of 3:1:2:1, and put the beaker Place in a ...

example 2

[0027] Mix the ferric chloride solution with a concentration of 2.4mol / L and the sodium hydroxide solution with a concentration of 6mol / L in an equal volume ratio and stir for 14 minutes. After the stirring is completed, let it stand for 7 minutes, then pour it into an evaporating dish, and place the evaporating dish Put it in an oven and dry it for 7 hours at a temperature of 110°C. After drying, take it out, scrape off the upper hard shell, and put the hard shell, iron slime and activated carbon into the kiln according to the mass ratio of 1:2:3. In the furnace, calcined at a temperature of 280 ° C for 3 hours to obtain a modified mixture; polystyrene, tetraethyl orthosilicate and deionized water were mixed in a beaker at a mass ratio of 2:1:3, and under nitrogen protection Stir for 25 minutes to get the stirrer, then mix the stirrer, sodium lauryl sulfate, silane coupling agent KH-560 and ammonium persulfate into a beaker according to the mass ratio of 3:1:2:1, and put the b...

example 3

[0029] Mix the ferric chloride solution with a concentration of 2.4mol / L and the sodium hydroxide solution with a concentration of 6mol / L according to an equal volume ratio and stir for 16 minutes. After stirring, let it stand for 8 minutes, then pour it into an evaporating dish, and place Put it in an oven and dry it at 120°C for 8 hours. After drying, take it out, scrape off the upper hard shell, and put the hard shell, iron slime and activated carbon into the kiln according to the mass ratio of 1:2:3. In the furnace, calcined at a temperature of 320 ° C for 4 hours to obtain a modified mixture; polystyrene, tetraethyl orthosilicate and deionized water were mixed in a beaker at a mass ratio of 2:1:3, and under nitrogen protection Stir for 30 minutes to get the stirrer, then mix the stirrer, sodium lauryl sulfate, silane coupling agent KH-560 and ammonium persulfate into a beaker according to the mass ratio of 3:1:2:1, and put the beaker Place in a constant temperature water ...

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Abstract

The present invention relates to the technical field of mechanical casting and more particularly to a preparation method of an anti-fracturing adsorbent precoated sand. According to the present invention, the anti-fracturing adsorbent precoated sand is prepared with modified quartz sand powder as raw sand, modified thermoplastic phenolic resin, a modified mixture and a modified copolymer as reinforcing agents, and urotropine and a lubricating substance as promoting auxiliary materials. The quartz sand powder is modified using a silane coupling agent first so as to improve the interface bondingcapacity of the resin to inorganic particles, and the formed Si-O-Si network structure is favorable for improving the anti-fracturing performance of the precoated sand. Then, the phenolic resin is modified using a natural plant oil and a titanate coupling agent, thereby achieving an internal toughening effect and improving the brittleness of the phenolic resin. Iron mud and hard crust are modified using activated carbon, so that the adsorbability of the precoated sand is improved. Self-prepared copolymer molecules are adsorbed on the surface of the quartz sand, forming a dense high-molecularfilm, so that the anti-fracturing performance of the precoated sand is further improved. The preparation method of the anti-fracturing adsorbent precoated sand has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of mechanical casting, in particular to a preparation method of anti-fracturing adsorption type coated sand. Background technique [0002] Resin-coated sand usually refers to the casting material used in the thermal curing process of mold core making. The aggregate is high-temperature-resistant inorganic natural quartz sand or artificial sand, and the surface of the aggregate is coated with a layer of organic polymer resin. Coated sand is generally composed of thermoplastic phenolic resin, curing agent, raw sand, lubricant and additives. [0003] The shell-coated sand process is to cover a layer of resin film on the surface of the sand grains, and heat and solidify when molding (core). When the coated sand is heated, the resin film on the surface of the sand grains melts, and under the action of the curing agent, the resin rapidly changes from a linear structure to a body-shaped structure, so that the coate...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02B22C1/22
Inventor 雷洪伍杨亚生张建初
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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