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A kind of serpentine nanosheet and preparation method thereof

A serpentine nanosheet, serpentine technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that leaf serpentine powder is difficult to reach nanoscale, etc. To achieve the effect of simple and easy manufacturing process, favorable surface modification, and improved surface activity

Active Publication Date: 2016-08-24
中建材科创新技术研究院(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the restriction of the particle size limit of mechanical grinding, it is difficult for antigorite powder to reach the nanoscale

Method used

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  • A kind of serpentine nanosheet and preparation method thereof

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[0036] An embodiment of the present invention discloses a preparation method of serpentine nanosheets, the process flow chart please refer to figure 1 , the preparation method of the serpentine nanosheets comprises the following steps 1: removing asbestos from the serpentine mineral, after wet grinding, drying treatment is carried out to obtain antigorite powder; step 2: antigorite The heat treatment of the antigorite powder not only effectively weakens the interlayer connection strength, but also greatly improves the surface activity of the powder; Step 3: Soak the heat-treated antigorite powder in acidic solution, and stirring, which can play a role in destroying the hydrogen bonds in the serpentine powder; step 4: use power ultrasound to act on the acidic solution containing the powder in step 3, and then filter and clean to form serpentine Nano powder; step 5: adding water to the serpentine nano powder to prepare the serpentine powder slurry, adding a surfactant to the ser...

Embodiment 1

[0051] Step 1: heat-treating the antigorite powder at a temperature of 590° C. for 1 hour.

[0052] Step 2: Prepare 100 mL of a mixed aqueous solution of acetic acid and citric acid, adjust the amount of acid to make the pH value 2-3, add 10 g of heat-treated serpentine powder, and stir at room temperature for 2 h.

[0053] Step 3: Use a power density of 90w / cm 2 Ultrasound acts on the acidic solution containing serpentine powder for 4 hours, and then it is filtered and cleaned.

[0054] Step 4: Prepare 100g / L powder slurry, add Span 20, the dosage is 7% of the powder mass. Heat and stir at 75°C for 30 minutes, filter, dry and disperse.

[0055] The average thickness of the obtained antigorite nanosheets is between 20nm and 50nm.

Embodiment 2

[0057] Step 1: heat-treating the antigorite powder at 550° C. for 1 hour.

[0058] Step 2: Prepare 100 mL of a mixed aqueous solution of acetic acid and citric acid, adjust the amount of acid to make the pH value 2-3, add 20 g of heat-treated serpentine powder, and stir at room temperature for 1 h.

[0059] Step 3: Use a power density of 80w / cm 2 Ultrasound acts on the acidic solution containing serpentine powder for 4 hours, and then it is filtered and cleaned.

[0060] Step 4: Prepare 150g / L powder slurry, add Span 20, the dosage is 6% of the powder mass. Heat and stir at 70°C for 35 minutes, filter, dry and disperse.

[0061] The average thickness of the obtained antigorite nanosheets is between 20nm and 70nm.

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Abstract

The invention relates to the field of serpentine, and in particular relates to a serpentine nanosheet and a preparation method thereof. The preparation method of the serpentine nanosheet comprises the following steps: removing asbestos substance from serpentine minerals, carrying out wet grinding until reaching the preset granularity, and drying to obtain antigorite powder; performing heat treatment to the antigorite powder; soaking the antigorite powder after heat treatment into an acid liquid, and stirring; acting on a powder-containing weak acid liquid by power ultrasounds, filtering and cleaning to form antigorite nano-powder; and adding a dispersing agent into the antigorite nano-powder to prepare serpentine powder slurry, adding a surface active agent into the serpentine powder slurry, stirring for a certain time under a heating state, filtering, drying and dispersing to obtain the serpentine nanosheet. The preparation method of the serpentine nanosheet has simple and easy manufacture process and can realize large-scale continuous industrial production.

Description

technical field [0001] The invention relates to the field of serpentine, in particular to a serpentine nanosheet and a preparation method thereof. Background technique [0002] Serpentine is a TO-type layered silicate mineral composed of "magnesia" octahedral sheets and [SiO 4 ] The hexagonal mesh of the tetrahedral sheet is combined at a ratio of 1:1 to form a structural unit layer, and the interlayer is bonded by hydrogen bonding, which is weaker. The (001) crystal plane is a complete cleavage plane. The ideal chemical formula: Mg 6 Si 4 o 10 (OH) 8 . In the native state, the octahedral site Mg 2+ Will be partially replaced by Fe, Ni, Al, tetrahedral Si will be replaced by Al, Fe, density 2.57g / cm 3 . There are three polytype minerals in serpentine, which are lizardite, antigorite and antigorite. Among them, after ultrafine grinding, antigorite powder presents a plate-like shape. [0003] The research and development of natural serpentine nanomaterials mainly focus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24B82Y30/00
Inventor 李桂金赵平韩琳白志民
Owner 中建材科创新技术研究院(山东)有限公司