Modification method for protecting crystal form of grammite

A wollastonite powder and modification technology, which is applied in the treatment of fibrous fillers and dyed polymer organic compounds, can solve the problems of reducing the aspect ratio, affecting the enhancement effect, and breaking the needle-shaped wollastonite, so as to protect the crystal shape Effect

Inactive Publication Date: 2010-09-29
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it will break the acicular wollastonite, reduce the aspect ratio, and affect the reinforcement effect
[0003] There is no report on the surface modification of acicular wollastonite powder by fumigation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The surface modification of acicular wollastonite powder is carried out according to the following steps:

[0016] 1), take by weighing 20 grams of 800 mesh acicular wollastonite powder, and pack in the wire mesh;

[0017] 2), weigh 0.5 grams of surface modifier liquid paraffin according to 2.5% of the mass of acicular wollastonite powder, and add 50 milliliters of ethanol to form a solution;

[0018] 3), put the acicular wollastonite powder packed with wire mesh on the solution;

[0019] 4), heating the solution until the solution evaporates, and fumigate the acicular wollastonite powder until the solution is completely evaporated;

[0020] 5), drying the fumigated acicular wollastonite powder at 70°C to obtain a modified acicular wollastonite powder with an activation rate of 95.2%;

[0021] The activation rate is determined according to the method stipulated in the chemical industry standard HG / T2567-94 of the People's Republic of China.

Embodiment 2

[0023] The surface modification operation steps of the acicular wollastonite powder are the same as in Example 1, except that the surface modifier adopts stearic acid, and the amount of the surface modifier stearic acid is 2.0% of the mass of the acicular wollastonite powder. The wollastonite powder is 325 mesh, and the activation rate of the obtained modified acicular wollastonite powder is 96.1%.

Embodiment 3

[0025] The surface modification operation steps of the acicular wollastonite powder are the same as in Example 1, except that the surface modifier adopts liquid paraffin and stearic acid, and the mass ratio of liquid paraffin to stearic acid is 1: 1. The dosage is 2.5% of the mass of the acicular wollastonite powder, the acicular wollastonite powder is 1250 mesh, and the activation rate of the obtained modified acicular wollastonite powder is 96%.

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PUM

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Abstract

The invention provides a modifying method for protecting the crystal shape of a vilnite. Surface modification is carried out on the needle vilnite powder by a fumigation way, which comprises the following procedures: solving some surface modifier in a solvent to get a solution, holding the needle vilnite powder by a metallic mesh, erecting the held needle vilnite powder above the solution, risingthe temperature till the solution vaporizes, so that the modifier wraps the needle vilnite powder surface to modify the surface of the powder. The surface modifier used is liquid pertrolin and / or stearic acid, the solvent is alcohol, the amount of the surface modifier is 2.0-2.5% of the needle vilnite powder by mass. The activity of the needle vilnite powder modified by the method is more than 95%. The invention needs not mix the powder, so the crystal shape is protected.

Description

technical field [0001] The invention relates to a method for modifying the surface of inorganic powder, in particular to a method for modifying the surface of acicular wollastonite powder. Background technique [0002] Modified acicular wollastonite powder can be added to plastics, rubber, paint, etc., which can not only reduce costs, but also play a role in strengthening. At present, the surface modification method of acicular wollastonite powder is dry modification: the acicular wollastonite powder and a surface modifier are stirred and kneaded at high speed in a high-speed kneader to achieve surface modification. The disadvantage of this method is that it will break the acicular wollastonite, reduce the aspect ratio, and affect the reinforcement effect. [0003] At present, there is no report on the surface modification of acicular wollastonite powder by fumigation. Contents of the invention [0004] The object of the present invention is to provide a method for surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/10C09C1/28
Inventor 张德毕巍
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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