Preparation of superfine calcium stearate and application of calcium stearate in precoated sand

A technology of calcium stearate and stearic acid, which is applied in the field of casting molding materials, can solve problems such as insufficient fluidity of coated sand, poor adhesion of calcium stearate, and reduced strength of coated sand, so as to reduce the release of harmful gases , The particle size is fine and uniform, and the effect of reducing troubles

Inactive Publication Date: 2017-04-19
南阳仁创砂业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of producing coated sand with this calcium stearate, problems such as poor adhesion of calcium stearate, easy agglomeration of coated sand, and insufficient fluidity of coated sand will occur. Increase the amount of calcium stearate, but this will reduce the strength of the coated sand

Method used

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  • Preparation of superfine calcium stearate and application of calcium stearate in precoated sand
  • Preparation of superfine calcium stearate and application of calcium stearate in precoated sand
  • Preparation of superfine calcium stearate and application of calcium stearate in precoated sand

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Effect test

Embodiment 1

[0025] A kind of preparation of superfine calcium stearate, stearic acid and calcium hydroxide are reacted in aqueous medium, obtain crude product; Dehydration, drying, pulverization process are carried out to crude product described superfine calcium stearate .

[0026] Application of ultra-fine calcium stearate in coated sand: the particle size of ultra-fine calcium stearate is relatively small and the distribution is relatively uniform, which can be better distributed in the coated sand, so that the coated sand can be mixed more evenly. More stable performance also achieves the effect of enhancing the fluidity of coated sand; in addition, ultrafine calcium stearate has lower cohesion than ordinary calcium stearate, and is not easy to agglomerate, so it can be well added to coated sand In addition, as the role of ultra-fine calcium stearate in coated sand increases, the amount of phenolic resin added can be further reduced to achieve cost savings.

[0027] Because ultra-fin...

Embodiment 2

[0029] A kind of preparation of superfine calcium stearate, weigh the stearic acid of 1000g, the calcium hydroxide of 150g, and the stearic acid after weighing and calcium hydroxide are added in the water of 9200g, mix and stir, then be heated to 60°C, and at this temperature, react for 120min under the condition of a stirring speed of 135r / min; make stearic acid and calcium hydroxide fully react, after the reaction, use a centrifuge to dehydrate the reaction solution, and then dehydrate The product was dried at a drying temperature of 45° C. for 55 minutes, and then pulverized to obtain superfine calcium stearate with a particle diameter of 0.02 mm.

[0030] The reaction equation is:

[0031] Ca(OH) 2 +2C 17 h 35 COOH→Ca(C 17 h 35 COO) 2 +H 2 o

[0032] The difference between the produced superfine calcium stearate and ordinary calcium stearate in terms of particle size and distribution figure 1 :

[0033] exist figure 1 It can be seen that the particle size of ult...

Embodiment 3

[0049] A kind of preparation of superfine calcium stearate, the diameter of the stearic acid 1801 of weighing 1000g, 150g is the calcium hydroxide of 0.045mm, and stearic acid and calcium hydroxide after weighing are added in the water of 9200g, mix Stir evenly, then heat to 70°C, and at this temperature, react for 180min under the condition of a stirring speed of 165r / min; make stearic acid and calcium hydroxide fully react, after the reaction, use a centrifuge to process the reaction solution Dehydration, then drying the dehydrated product at a temperature of 55° C. for 65 minutes, and then pulverizing to obtain superfine calcium stearate with a particle diameter of 0.025 mm.

[0050] The reaction equation is:

[0051] Ca(OH) 2 +2C 17 h 35 COOH→Ca(C 17 h 35 COO) 2 +H2O

[0052] The performance of the superfine calcium stearate produced and the performance of common calcium stearate are as shown in table 4:

[0053] Table 4

[0054] Specific gravity (g / cm...

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Abstract

The invention relates to preparation of superfine calcium stearate and application of calcium stearate in precoated sand. A preparation method of superfine calcium stearate comprises the following steps that stearic acid and calcium hydroxide react in an aqueous medium, and a crude product is obtained; and the crude product is dehydrated, dried and smashed, and superfine calcium stearate is obtained. The preparation of superfine calcium stearate and application of calcium stearate in the precoated sand have the beneficial effects that superfine calcium stearate produced through the preparation method of superfine calcium stearate is small and uniform in particle size, low in coherence and high in smelting point. When superfine calcium stearate is used in the precoated sand, superfine calcium stearate can be dispersed into the precoated sand better, trouble caused by caking of calcium stearate in the precoated sand is reduced, and the precoated sand is mixed more evenly and is better in performance. Superfine calcium stearate is added into the precoated sand, the fluidity of the precoated sand is enhanced, the adding amount of phenolic resin is reduced; and cost is reduced to a certain degree, and harmful gas released in the process of making cores through the precoated sand is reduced.

Description

technical field [0001] The invention relates to a casting molding material, in particular to the preparation of superfine calcium stearate and its application in coated sand. Background technique [0002] The coated sand mainly uses high-quality selected natural quartz sand as raw sand, thermoplastic phenolic resin, urotropine and reinforcing agent as raw materials. According to the different technical requirements of users, the ratio should be adjusted appropriately in terms of curing speed, release property, fluidity, collapsibility, surface finish of castings, storage, etc. It is one of the best molding materials for automobiles, tractors, hydraulic parts, etc. At present, the calcium stearate used in the preparation of coated sand is the first-class product in the technical requirements of calcium stearate. The calcium content of this calcium stearate is 6.5±0.5%, the free acid is ≤0.5%, and the heating loss ≤3%, melting point ≥140°C, fineness is greater than 99.0% thr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C07C51/41C07C51/42C07C53/126B22C1/02
CPCC07C51/412B22C1/02C07C51/42C07C53/126
Inventor秦申二胡胜利冯俊龙尹海军
Owner南阳仁创砂业科技有限公司