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Production method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers

A technology of anhydrous calcium sulfate and production methods, applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of high production cost, difficult industrialization, complicated production process, etc., and achieve low production cost and hydrophobicity Excellent and short process flow

Inactive Publication Date: 2012-07-04
四川万润非金属矿物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above-mentioned two Chinese patents, when preparing calcium sulfate whiskers and anhydrous calcium sulfate whiskers, although the starting materials have all adopted cheap and easy-to-obtain calcium carbonate, or CaCO 3 Limestone with a content of more than 98%, but the production process is complicated, especially the method for preparing anhydrous calcium sulfate whiskers, which is not easy to industrialize, and the production cost is relatively high

Method used

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  • Production method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers
  • Production method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers
  • Production method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of calcium brine emulsion: Add 25g of limestone powder into 50g of water under stirring, and continue to stir for 20 minutes to prepare a calcium brine emulsion; the CaCO of the limestone used in this step 3 The content is 98%, the crushing fineness of limestone is 325 mesh, and the molar mass of limestone powder is 0.25mol.

[0037] (2) Preparation of sulfuric acid aqueous solution: Add 26.6ml of concentrated sulfuric acid with a concentration of 98% in 440ml of water under the stirring condition of 83 rpm to prepare a sulfuric acid aqueous solution with a sulfuric acid concentration of 10%, and then add 0.088mol of acetic acid; The crystal transformation agent used in the invention has formic acid, acetic acid or propionic acid, preferably acetic acid in the present embodiment.

[0038] (3) Conversion reaction, aging, filtration and washing:

[0039] The first is conversion reaction and aging. Heat the sulfuric acid aqueous solution in step (2) to in...

Embodiment 2

[0049] Except that the surface modifier is Tween-60, and the consumption is 1.5% of the anhydrous calcium sulfate whisker weight, other conditions are the same as in Example 1. The activation index of the finally obtained modified anhydrous calcium sulfate whiskers was 58.2%.

Embodiment 3

[0051] Except that the aging time was 2 hours, other conditions were the same as in Example 1. The obtained anhydrous calcium sulfate whisker has a loose appearance, its XRD spectrum is consistent with PDF card number 37-1496, and the average aspect ratio is greater than 50.

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Abstract

The invention discloses a preparation method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers. The method comprises the following steps that: firstly, limestone powder is added into stirred water to be prepared into calcium salt aqueous emulsion; then, sulfuric acid and crystal modifiers are sequentially added into the stirred water to be prepared into sulfuric acid water solution; next, the calcium salt aqueous emulsion containing 1 mol part of Ca<2+> is added into the sulfuric acid water solution containing 2 mol parts of SO4<2-> with the temperature reaching 100 to 110 DEG C, then, morphology control agents are added, the materials are subjected to stirring and aging for 2 to 3.5 hours under the temperature condition being 110 to 120 DEG C, leaching and washing are carried out, and calcium sulfate hemihydrate crystal whisker wet products are obtained; the calcination drying finally is carried out under the temperature condition higher than 200 DEG C to obtain the anhydrous calcium sulfate crystal whiskers; and then, the surface modification treatment is carried out to finally obtain the high-reinforcement modified anhydrous calcium sulfate crystal whiskers. The preparation method has the advantages that the product quality is high, the cost is low, the preparation process is short, the reaction condition is mild, and in addition, green and environmental-friendly effects can be realized.

Description

technical field [0001] The invention relates to the technical field of non-metallic material processing, in particular to a production method of modified anhydrous calcium sulfate whiskers. Background technique [0002] A whisker is a fine crystalline fiber that grows into a needle shape as a single crystal, which is almost ideal. It has the characteristics of large aspect ratio and no grain boundary. Due to its small diameter and highly ordered atomic arrangement structure during crystallization, it hardly accommodates structural defects such as voids and dislocations of conventional materials. Therefore, the mechanical strength and modulus are close to the theoretical values ​​of complete crystal materials, and the mechanical properties far exceed General granular fillers currently used in large quantities. The special shape of the whisker with a large aspect ratio makes it a reinforcing agent for new composite materials with excellent mechanical properties. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/10C30B29/62C30B7/14C01F11/46
Inventor 刘维江孙文道
Owner 四川万润非金属矿物材料有限公司
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