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Method for surface modification of calcium sulfate whiskers

A calcium sulfate whisker and surface modification technology, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of limited application range, insufficient compatibility, and insufficient stability of calcium sulfate whisker. Achieve enhanced mechanical properties, good modification effect, increased compatibility and stability

Active Publication Date: 2015-08-12
KINGENTA NORSTERRA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The surface modification materials for calcium sulfate whiskers in the prior art rely on intermolecular forces to combine with the surface of calcium sulfate whiskers, resulting in unstable properties of the modified calcium sulfate whiskers, limited use range, and insufficient compatibility etc., the present invention provides a method for modifying calcium sulfate whiskers by chemically bonded polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for surface modification of calcium sulfate whiskers, comprising steps as follows:

[0028] (1) Calcium sulfate whiskers, vinyltriethoxysilane and dehydrated alcohol are mixed evenly according to the ratio of mass ratio 10:3:500, and the pH value of the reaction system is adjusted to 9 by utilizing 27wt% ammonia water, and then the reaction The system was heated to 40°C, reacted at a stirring speed of 50 rpm for 3 hours, filtered with suction, and dried to obtain vinyl-modified calcium sulfate whiskers;

[0029] (2) Mix the above-mentioned vinyl-modified calcium sulfate whiskers, azobisisobutyronitrile, polystyrene monomer and acetone according to the mass ratio of 1:0.2:7:30, and mix them at 70°C React for 3 hours, wash and dry to obtain polystyrene-modified calcium sulfate whiskers.

[0030] After detection and analysis, the activation index of the modified calcium sulfate whiskers was 0.9912, and the contact angle was 121.1°. The modified calcium sulfate w...

Embodiment 2

[0032] A method for surface modification of calcium sulfate whiskers, comprising steps as follows:

[0033] (1) Mix calcium sulfate whiskers, 3-(methacryloyloxy)propyltrimethoxysilane and dehydrated alcohol according to the mass ratio of 10:5:500, and adjust the pH value of the reaction system with 27% ammonia water to 9, then the reaction system was heated to 40°C, reacted at a stirring speed of 50 rpm for 5 hours, filtered with suction, and dried to obtain vinyl-modified calcium sulfate whiskers;

[0034] (2) Mix the above-mentioned vinyl-modified calcium sulfate whiskers, azobisisobutyronitrile, polystyrene monomer and toluene according to the mass ratio of 1:0.2:7:60, and mix them evenly at 70°C React for 5 hours, wash and dry to obtain polystyrene-modified calcium sulfate whiskers.

[0035] After detection and analysis, the activation index of the modified calcium sulfate whiskers is 0.9947, and the contact angle is 124.5°. The modified calcium sulfate whiskers are adde...

Embodiment 3

[0037] A method for surface modification of calcium sulfate whiskers, comprising steps as follows:

[0038] (1) Mix calcium sulfate whiskers, 3-(methacryloyloxy)propyltrimethoxysilane and dehydrated alcohol according to the mass ratio of 10:6:500, and adjust the pH value of the reaction system with 27% ammonia water to 9, then the reaction system was heated to 40°C, reacted at a stirring speed of 50 rpm for 5 hours, filtered with suction, and dried to obtain vinyl-modified calcium sulfate whiskers;

[0039] (2) Mix the above-mentioned vinyl-modified calcium sulfate whiskers, azobisisobutyronitrile, polystyrene monomer and toluene according to the mass ratio of 1:0.2:8:60, and mix them evenly at 70°C React for 5 hours, wash and dry to obtain polystyrene-modified calcium sulfate whiskers.

[0040] After detection and analysis, the activation index of the modified calcium sulfate whiskers was 0.9945, and the contact angle was 124.2°. The modified calcium sulfate whiskers are ad...

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Abstract

The invention relates to a method for the surface modification of calcium sulfate whiskers, which comprises the following steps: firstly, enabling calcium sulfate whiskers, a vinyl-containing silane coupling agent and absolute ethyl alcohol to react under alkaline conditions, so that hydroxyl groups on the surfaces of the calcium sulfate whiskers are modified into vinyl, and then vinyl modified calcium sulfate whiskers are obtained; and then, the vinyl modified calcium sulfate whiskers and polymer monomers are subjected to free radical polymerization, so that polymer modified calcium sulfate whiskers are obtained. According to the invention, inorganic calcium sulfate whiskers can be subjected to organic modification well, so that the compatibility of the calcium sulfate whiskers and organic materials is greatly improved; and after the modified calcium sulfate whiskers as material reinforced components are added into corresponding polymer materials, the mechanical properties of the modified calcium sulfate whiskers can be significantly enhanced.

Description

technical field [0001] The invention relates to a surface modification process, in particular to a calcium sulfate whisker surface modification process. Background technique [0002] Calcium sulfate whisker is a fibrous crystal with uniform cross-section, complete shape and perfect internal structure, which is grown in the form of single crystal with gypsum as raw material and artificially controlled. It can be used as a reinforcing component of materials. Compared with glass fibers, calcium sulfate whiskers have the advantages of smaller size, high temperature resistance, good toughness, high strength, and stronger affinity with polymers such as rubber and plastics, etc., and can be widely used In plastics, rubber, paper, adhesives and other industries. [0003] However, due to the large specific surface area, high surface energy and contact interface of calcium sulfate whiskers, when calcium sulfate whiskers are applied to organic composite materials such as plastics, sin...

Claims

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Application Information

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IPC IPC(8): C30B33/00C30B29/62C30B29/10
Inventor 朱孔杰徐文华吴亚男李素华
Owner KINGENTA NORSTERRA CHEM CO LTD