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Inorganic coated sand and preparation process thereof

A preparation process and technology of coated sand, which is applied in the field of coated sand, can solve the problems of complex preparation process, low cost performance, high energy consumption, etc., and achieve the effects of stable chemical properties, large porosity and good bonding performance

Active Publication Date: 2018-07-20
柳州柳晶环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of inorganic coated sand in the prior art is complicated, consumes a lot of energy, costs high, and has low cost performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take raw materials by weight, prepare inorganic coated sand according to the following method:

[0032] A. After mixing the high temperature resistant additives, pour them into a grinder and grind them into powder mixture A;

[0033] B. Add 20 parts of dolomite powder, 5 parts of sulfonated lignin fiber, and 10 parts of thermoplastic phenolic resin to the powder mixture A, mix them and pour them into a stirring tank for high-speed stirring for 10 minutes to obtain a mixture B. The rotating speed of the stirring tank is 80 rpm / Minute;

[0034] C. Add 20 parts of resin binder to mixture B, mix and stir thoroughly to obtain mixture C;

[0035] D. Add 70% raw sand to mixture C, mix it and pour it into a mixer for 20 minutes to obtain mixture D, wherein the mixing temperature is 55°C;

[0036] E. After the mixture D is sieved through a 100-mesh sieve, the inorganic coated sand is obtained.

[0037] Among them, the high temperature additive is 5 parts of white carbon blac...

Embodiment 2

[0039] Take raw materials by weight, prepare inorganic coated sand according to the following method:

[0040] A. After mixing the high temperature resistant additives, pour them into a grinder and grind them into powder mixture A;

[0041] B. Add 30 parts of dolomite powder, 10 parts of sulfonated lignin fiber, and 20 parts of thermoplastic phenolic resin to the powder mixture A, mix them and pour them into a stirring tank for high-speed stirring for 30 minutes to obtain a mixture B. The rotating speed of the stirring tank is 150 rpm / Minute;

[0042] C. Add 40 parts of resin binder to mixture B, mix and stir thoroughly to obtain mixture C;

[0043] D. Add 100 parts of raw sand to mixture C, mix it and pour it into a mixer for 50 minutes to obtain mixture D, wherein the mixing temperature is 70°C;

[0044] E. After the mixture D is sieved through a 200-mesh sieve, the inorganic coated sand is obtained.

[0045] Among them, the high temperature additive is 8 parts of silico...

Embodiment 3

[0047] Take raw materials by weight, prepare inorganic coated sand according to the following method:

[0048] A. After mixing the high temperature resistant additives, pour them into a grinder and grind them into powder mixture A;

[0049] B. Add 22 parts of dolomite powder, 6 parts of sulfonated lignin fiber, and 12 parts of thermoplastic phenolic resin to the powder mixture A, mix them and pour them into a stirring tank for high-speed stirring for 15 minutes to obtain a mixture B. The rotating speed of the stirring tank is 90 rpm / Minute;

[0050] C. Add 25 parts of resin binder to mixture B, mix and stir thoroughly to obtain mixture C;

[0051] D. Add 75 parts of raw sand to mixture C, mix and pour it into a mixer for 30 minutes to obtain mixture D, wherein the mixing temperature is 58°C;

[0052] E. After the mixture D is sieved through a 100-mesh sieve, the inorganic coated sand is obtained.

[0053] Among them, the high temperature additive is 7 parts of white carbon...

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Abstract

The invention discloses inorganic coated sand. The inorganic coated sand comprises raw materials of, by weight, 70-100 parts of raw sand, 20-40 parts of resin binders, 20-30 parts of dolomite powder,5-10 parts of sulfonation lignin fibers, 10-20 parts of thermoplastic phenolic resins, and 7-42 parts of high temperature resistance additives. The invention further discloses a preparation process for the inorganic coated sand. The preparation process comprises the steps that the high temperature resistance additives is mixed and then poured into a grinding machine, and the high temperature resistance additives are grinded into a powder mixture; the dolomite powder, the sulfonation lignin fibers, and the thermoplastic phenolic resins are added into the powder mixture A to be mixed, and then poured into a stirring tank to be stirred at a high speed; the resin binders are added into a mixture B, mixed and fully stirred; the raw sand is added into a mixture C, and the mixture C after being mixed is poured into a mixing mill to be mixed; and the inorganic coated sand is obtained after a mixture D is sieved. The preparation process is simple in operation and low in cost, and it is guaranteed that compositions of the raw materials can be fully mixed. The inorganic coated sand has high temperature resistance and high strength, and the stability of the inorganic coated sand is effectivelyimproved.

Description

technical field [0001] The invention belongs to the technical field of coated sand, and in particular relates to an inorganic coated sand and a preparation process thereof. Background technique [0002] Coated sand, the surface of the sand grains is covered with a layer of solid resin film or core sand before molding, used for steel castings and iron castings. There are cold method and hot method coating process for coated sand: cold method, dissolve the resin with ethanol, and add urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain coated sand ; thermal method, preheat the sand to a certain temperature, add resin to melt it, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtain coated sand. The coated sand mainly uses high-quality selected natural quartz sand as raw sand, thermoplastic phenolic resin, urotro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/22
CPCB22C1/02B22C1/22
Inventor 任文强黄力吴星王古月任文虎吴云
Owner 柳州柳晶环保科技有限公司
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