Method for surface modification of calcium sulfate crystal whisker

A calcium sulfate whisker and surface modification technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, crystal growth, etc., to achieve zero emissions and reduce production costs

Active Publication Date: 2012-08-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of this invention is to provide a kind of method of surface modification calcium sulfate whisker, the technical problem solved is to overcome existing calcium sulfate whisker and modification process insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The concrete steps of present embodiment surface modification calcium sulfate whisker comprise as follows:

[0029] (1) Dry the calcium sulfate whiskers under hot air at 110°C for 2 hours, and then stand at room temperature for 8 minutes to obtain dry calcium sulfate whiskers; the average diameter of calcium sulfate whiskers is 0.5 μm, the average length is 30 μm, and the average major diameter than 20, where CaSO 4 Content ≥ 99.99wt%.

[0030] (2) Mix calcium sulfate whiskers, polyquaternary ammonium salts, octadecylamine and absolute ethanol at a mass ratio of 100:2:3:1200, and use ammonia water to adjust the pH of the reaction system to 6; the quality of ammonia in ammonia water The score is 25%.

[0031] (3) Heat the reaction system to 80°C, shake at a constant temperature for 6 minutes under the condition of a shaking rate of 300r / min, then filter, and return the filtrate to the reactor for use to obtain a filter residue;

[0032] (4) Dry the filter residue obta...

Embodiment 2

[0034] The concrete steps of present embodiment surface modification calcium sulfate whisker comprise as follows:

[0035] (1) Dry the calcium sulfate whiskers under hot air at 90°C for 3 hours, and then let them stand at room temperature for 5 minutes to obtain dry calcium sulfate whiskers; the average diameter of calcium sulfate whiskers is 3 μm, the average length is 150 μm, and the average aspect ratio 100, where CaSO 4 Content ≥ 99.99wt%.

[0036] (2) Mix calcium sulfate whiskers, polyquaternary ammonium salts, octadecylamine and absolute ethanol at a mass ratio of 100:3:5:1000, and use ammonia water to adjust the pH of the reaction system to 9; the quality of ammonia in ammonia water The score is 26%.

[0037] (3) Heat the reaction system to 70°C, shake at a constant temperature for 7 minutes at a shaking rate of 300r / min, then filter, and return the filtrate to the reactor for use to obtain a filter residue;

[0038] (4) Dry the filter residue obtained in step (3) wi...

Embodiment 3

[0040] The concrete steps of present embodiment surface modification calcium sulfate whisker comprise as follows:

[0041] (1) Dry calcium sulfate whiskers under hot air at 100°C for 4 hours, and then stand at room temperature for 10 minutes to obtain dry calcium sulfate whiskers; the average diameter of calcium sulfate whiskers is 6 μm, the average length is 300 μm, and the average aspect ratio 200, of which CaSO 4 Content ≥ 99.99wt%.

[0042](2) Mix calcium sulfate whiskers, polyquaternary ammonium salt, octadecylamine and absolute ethanol at a mass ratio of 100: 4: 6: 1500, and use ammonia water to adjust the pH of the reaction system to 7; the quality of ammonia in ammonia water The score is 28%.

[0043] (3) Heat the reaction system to 90°C, shake at a constant temperature for 8 minutes at a shaking rate of 300r / min, then filter, and return the filtrate to the reactor for use to obtain a filter residue;

[0044] (4) Dry the filter residue obtained in step (3) with hot ...

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Abstract

The invention relates to a method for jointly modifying a calcium sulfate crystal whisker by utilizing quaternary ammonium salt and octadecylamine and belongs to the technical field of material utilization. The method comprises the following steps of: firstly drying the calcium sulfate crystal whisker; then, mixing the calcium sulfate crystal whisker, poly quaternary ammonium salt, octadecylamine and absolute ethyl alcohol according to a certain proportion, adjusting the pH of the liquid to 6-9 and filtering; and drying filter residues to obtain the modified product calcium sulfate crystal whisker. The method is carried out under the non-high-temperature condition of the absolute ethyl alcohol and can better protect the structure of the calcium sulfate crystal whisker, maintains the length-diameter ratio of the calcium sulfate crystal whisker, and is good in the modification effect and high in activation index; and the calcium sulfate crystal whisker is used as a material enhancing element to be added into polycaprolactone so as to obviously enhance the mechanical property of polycaprolactone. By using the method, the production cost is reduced, and zero discharge of pollutants is realized. The method disclosed by the invention belongs to a green and clean chemical process.

Description

Technical field: [0001] The invention relates to a method for jointly modifying calcium sulfate whiskers by using quaternary ammonium salt and octadecylamine, which belongs to the technical field of material utilization. Background technique: [0002] Calcium sulfate whiskers are fibrous crystals produced by dissolution, recrystallization or hydrothermal process. It can be used as a material reinforcement component. Compared with glass fiber, calcium sulfate whiskers are finer, high temperature resistance, good toughness, high strength, and stronger affinity with polymers such as rubber and plastics. It is a green environmental protection material with excellent performance. It can be widely used in industries and fields such as rubber, plastics, adhesives, friction materials, cement retardation and environmental engineering. [0003] However, due to the characteristics of large specific surface area, high surface energy and large contact interface of calcium sulfate whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/62C30B33/00C08K7/08C08K9/04C01F11/46
Inventor 马林转王华陈迁卿山崔琼芳祝星
Owner KUNMING UNIV OF SCI & TECH
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