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Polymer graft-coated modified calcium sulfate whisker, and preparation method and application thereof

A technology of calcium sulfate whisker and graft modification, applied in the field of material modification, can solve the problems of environmental pollution, low carbon atomic ratio on the surface of modified calcium sulfate whisker, high toxicity, etc. Compatibility and affinity, good effect of stress transmission

Active Publication Date: 2020-07-17
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses toluene as a solvent, which is highly toxic and easy to cause environmental pollution, and the proportion of carbon atoms on the surface of the modified calcium sulfate whisker that is finally obtained is relatively low

Method used

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  • Polymer graft-coated modified calcium sulfate whisker, and preparation method and application thereof
  • Polymer graft-coated modified calcium sulfate whisker, and preparation method and application thereof
  • Polymer graft-coated modified calcium sulfate whisker, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0038] This embodiment provides a kind of preparation method of polymer graft coating modified calcium sulfate whisker, it comprises the following steps:

[0039] S1. Dissolve 0.5 g of sodium oleate in 300 mL of deionized water to obtain a sodium oleate aqueous solution, and put the sodium oleate aqueous solution into a four-necked flask equipped with a condensation reflux device, a thermometer, a stirrer, and a nitrogen ventilation device .

[0040] S2. Introduce nitrogen gas into the above-mentioned sodium oleate aqueous solution while stirring at a speed of 300 rpm; then, after heating the above-mentioned sodium oleate aqueous solution to 50°C, add 10 g of anhydrous calcium sulfate crystals to the above-mentioned sodium oleate aqueous solution It must be stirred and mixed for 20 minutes to obtain a dispersion. Among them, the length of the anhydrous calcium sulfate whiskers is 30-120 μm, and the aspect ratio is 10-80.

[0041] S3. The above-mentioned dispersion liquid is ...

Embodiment 2

[0046] This embodiment provides a kind of preparation method of polymer graft coating modified calcium sulfate whisker, it comprises the following steps:

[0047] S1. Dissolve 0.5 g of sodium oleate in 300 mL of deionized water to obtain a sodium oleate aqueous solution, and put the sodium oleate aqueous solution into a four-necked flask equipped with a condensation reflux device, a thermometer, a stirrer, and a nitrogen ventilation device .

[0048] S2. Introduce nitrogen gas into the above-mentioned sodium oleate aqueous solution while stirring at a speed of 300 rpm; then, after heating the above-mentioned sodium oleate aqueous solution to 50°C, add 10 g of anhydrous calcium sulfate crystals to the above-mentioned sodium oleate aqueous solution It must be stirred and mixed for 20 minutes to obtain a dispersion. Among them, the length of the anhydrous calcium sulfate whiskers is 30-120 μm, and the aspect ratio is 10-80.

[0049] S3. The above-mentioned dispersion liquid is ...

Embodiment 3

[0054] This embodiment provides a kind of preparation method of polymer graft coating modified calcium sulfate whisker, it comprises the following steps:

[0055] S1. Dissolve 0.5 g of sodium oleate in 300 mL of deionized water to obtain a sodium oleate aqueous solution, and put the sodium oleate aqueous solution into a four-necked flask equipped with a condensation reflux device, a thermometer, a stirrer, and a nitrogen ventilation device .

[0056] S2. Introduce nitrogen gas into the above-mentioned sodium oleate aqueous solution while stirring at a speed of 300 rpm; then, after heating the above-mentioned sodium oleate aqueous solution to 50°C, add 10 g of anhydrous calcium sulfate crystals to the above-mentioned sodium oleate aqueous solution It must be stirred and mixed for 20 minutes to obtain a dispersion. Among them, the length of the anhydrous calcium sulfate whiskers is 30-120 μm, and the aspect ratio is 10-80.

[0057] S3. The above-mentioned dispersion liquid is ...

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Abstract

The invention is suitable for the technical field of material modification, and provides a polymer graft-coated modified calcium sulfate whisker, and a preparation method and application thereof. Thepreparation method comprises the following steps: in a water phase, carrying out surface modification on anhydrous calcium sulfate whisker with sodium oleate to obtain sodium oleate modified calcium sulfate whisker; mixing the sodium oleate modified calcium sulfate whisker with an acrylic monomer and an initiator, and carrying out polymer graft modification on the sodium oleate modified calcium sulfate whisker to obtain the polymer graft-coated modified calcium sulfate whisker. The anhydrous calcium sulfate whisker is modified by utilizing sodium oleate containing carbon-carbon double bonds, and acrylate monomers and introduced double bonds are subjected to copolymerization reaction under the action of an initiator, so that long-chain high-molecular polymers can be grafted and coated on the surface of the calcium sulfate whisker. The polymer grafted and coated modified calcium sulfate whisker can achieve a good stress transmission effect so as to improve the mechanical properties of ahigh polymer material.

Description

technical field [0001] The invention belongs to the technical field of material modification, and in particular relates to a polymer graft-coated modified calcium sulfate whisker and a preparation method and application thereof. Background technique [0002] Calcium sulfate whisker is a needle-like single crystal material with low cost and wide sources. It can be prepared from solid waste such as phosphogypsum, and has a large aspect ratio, good thermal and chemical stability. , high mechanical strength, and environmental friendliness have attracted much attention in recent years and have been widely used as reinforcing materials for materials such as plastics, rubber, and concrete. Due to the special structure of the whiskers, it is different from the approximately spherical structure of the traditional inorganic powder commonly used. When the needle-like structure is filled with polymers, the composite material has fiber pulling out under force, preventing crack propagatio...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K9/04C08K7/08
CPCC08K7/08C08K9/04C08K9/10C08K2201/004C08K2201/016
Inventor 谢贵明王明威曹建新
Owner GUIZHOU UNIV
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