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Preparation method of boehmite with low water absorption

A technology of low water absorption and boehmite, which is applied in the field of preparation of low water absorption boehmite, can solve problems such as high moisture content of coated and rolled products, increase of metal ion impurity content, increase of difficulty of water washing, etc., to achieve Facilitate large-scale industrial production, narrow particle size distribution and uniform shape

Inactive Publication Date: 2021-03-09
SUZHOU GINET NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process, it is necessary to add inorganic bases to adjust the pH value to strong alkalinity. The addition of morphology control agents will increase the content of metal ion impurities and increase the difficulty of subsequent washing, thereby increasing the cost.
[0008] Although these methods can prepare boehmite that meets the requirements, it is still necessary to add a certain amount of stabilizer to increase the stability of the slurry in the subsequent configuration of the coating slurry. The problem

Method used

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  • Preparation method of boehmite with low water absorption
  • Preparation method of boehmite with low water absorption
  • Preparation method of boehmite with low water absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Mix aluminum hydroxide and water according to the mass ratio of 2:3 and stir evenly to obtain a mixed solution A;

[0041] Step 2: Weigh the aluminum hydroxide and the capping agent at a ratio of 1:0.02 to weigh the capping agent, and then add the capping agent to the mixed solution A to obtain a mixed solution B, wherein the capping agent is ammonium polycarboxylate;

[0042] Step 3: Sanding the mixed solution B to obtain a slurry C with a median particle size of 0.4-0.5 μm;

[0043] Step 4: Dilute slurry C and pure water at a ratio of 1:7 to obtain slurry D;

[0044] Step 5: Then add the slurry D into the reactor, and the filling volume of the reactor is 80%; under the condition of 220°C, set the rotation speed at 10rpm / min to carry out the hydrothermal reaction for 4h;

[0045] Step 6: After the hydrothermal reaction is over, the reaction kettle is cooled to room temperature and taken out, filtered, washed and dried with a plate frame, and finally dispersed ...

Embodiment 2

[0047] Step 1: Mix aluminum hydroxide and water according to the mass ratio of 2:3 and stir evenly to obtain a mixed solution A;

[0048] Step 2: Weigh the aluminum hydroxide and the capping agent at a ratio of 1:0.01 to weigh the capping agent, and then add the capping agent to the mixed solution A to obtain a mixed solution B, wherein the capping agent is ammonium polycarboxylate;

[0049] Step 3: Sanding the mixed solution B to obtain a slurry C with a median particle size of 0.4-0.6 μm;

[0050] Step 4: Dilute slurry C and pure water at a ratio of 1:1 to obtain slurry D;

[0051] Step 5: Then add the slurry D into the reactor, and the filling volume of the reactor is 80%; under the condition of 220°C, set the rotation speed at 10rpm / min to carry out the hydrothermal reaction for 4h;

[0052] Step 6: After the hydrothermal reaction is over, the reaction kettle is cooled to room temperature and taken out, filtered, washed and dried with a plate frame, and finally dispersed ...

Embodiment 3

[0054] Step 1: Mix aluminum hydroxide and water according to the mass ratio of 2:3 and stir evenly to obtain a mixed solution A;

[0055] Step 2: Weigh the aluminum hydroxide and the capping agent at a ratio of 1:0.02 to weigh the capping agent, and then add the capping agent to the mixed solution A to obtain a mixed solution B, wherein the capping agent is ammonium polycarboxylate;

[0056] Step 3: Sanding the mixed solution B to obtain a slurry C with a median particle size of 0.4-0.6 μm;

[0057] Step 4: Dilute slurry C and pure water at a ratio of 1:1 to obtain slurry D;

[0058] Step 5: Then add the slurry D into the reactor, and the filling volume of the reactor is 80%; under the condition of 220°C, set the rotation speed at 10rpm / min to carry out the hydrothermal reaction for 4h;

[0059] Step 6: After the hydrothermal reaction is over, the reaction kettle is cooled to room temperature and taken out, filtered, washed and dried with a plate frame, and finally dispersed ...

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Abstract

The invention discloses a preparation method of boehmite with low water absorptivity, which comprises the following steps: by using aluminum hydroxide and water as raw materials, adding an end-cappingreagent, carrying out sanding treatment, diluting the sanded slurry with pure water, putting the diluted slurry into a reaction kettle, carrying out hydrothermal reaction, and filtering, washing, drying and scattering after the reaction is finished to obtain the boehmite with low water absorptivity. The boehmite with low water absorption is obtained. According to the preparation method of the boehmite, under the condition that the PH value of a system does not need to be adjusted, hydroxyl generated through decomposition of the end-capping reagent is combined with carboxyl on the surface of the boehmite, finally, end capping is conducted through a carbon chain, the water absorption capacity of the boehmite is reduced, and the boehmite is narrow in particle size distribution, high in crystallinity degree and uniform in morphology.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a method for preparing low water-absorbing boehmite used for lithium battery separator coatings. Background technique [0002] Boehmite, also known as boehmite and boehmite (alumina hydrate), has a chemical formula of γ-AlOOH and is the main component of bauxite. It belongs to the orthorhombic crystal system and has a layered structure. In each single structural layer, oxygen ions (O 2- ) are arranged at the vertices of the octahedron in a cubic close-packed manner, aluminum ions (Al 3+ ) is located in the center of the octahedron to form a double-layer structure, and the hydroxide (OH - ) is located on the surface of the layered structure, and the layers are connected together by hydrogen bonds. Because of its unique crystal structure and morphology, boehmite has the characteristics of zero point charge, high interfacial free energy, large porosity, l...

Claims

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Application Information

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IPC IPC(8): C01F7/02
CPCC01F7/02C01F7/021C01F7/023C01F7/026C01P2002/72C01P2004/03C01P2004/61
Inventor 文明
Owner SUZHOU GINET NEW MATERIAL TECH CO LTD
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