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Process for preparing ceramic sheet from emulsoid system by water-base doctor blading method

A technology of water-based casting and ceramic flakes, which is applied in the field of latex water-based casting method to prepare ceramic flakes. It can solve the problems of low strength, low solid content, and small solid content of ceramic powder, and achieve good strength and flexibility. properties, smooth surface, and the effect of inhibiting particle settling

Inactive Publication Date: 2005-02-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the advantages and disadvantages of water-based casting are very obvious
The advantages of water as a solvent are low cost, safe and hygienic use, and convenience for large-scale production; its disadvantages are: (1) poor wettability to powder, slow volatilization and long drying time; (2) difficult degassing of slurry; (3) Some ceramic materials can react with water, such as certain nitrides, carbides, MgO and CaO, etc.; (4) The flexibility of the ceramic green body after casting is poor and the strength is not high
The monomer is added as a dispersant at the beginning, and then the molding conditions are changed to make it polymerize into a polymer to act as a binder, but the application range of this method is narrow, because different powders require different types of dispersants, dispersants If the molecular weight is too small, it is difficult to form steric hindrance stability, and the dispersion effect is affected; (2) water-soluble polyurethane resin
The process needs to add a water-compatible organic solvent, and the drying process should also be controlled; (3) polyvinyl alcohol (PVA) is used as a binder, but the PVA binder system also has its disadvantages: the slurry has a high viscosity, and the ceramic The solid content of the powder is small, generally below 35vol%, and the drying time is long; (4) the acrylamide monomer is used as a binder, and the gelation reaction is triggered by adding a catalyst and an initiator, thereby acting as a binder Although the cast element sheet prepared by this method has higher strength and faster drying, due to the polymerization inhibition effect of oxygen, the surface of the cast sheet is prone to powder and peeling, and the casting equipment is also more complicated; (5) fiber The disadvantage of the plain binder is that the solid content in the slurry is low, and the density of the cast sheet is low; (6) polyacrylic acid and its derivatives are used as the binder, but because the viscosity of the binder itself is low, the density of the slurry is low. Solid content is difficult to increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 100 grams of Al with a particle size of 3 μm 2 o 3 Add 20ml powder containing 0.3g dispersant polyacrylate PAA-NH 4 In the water, after ball milling for 24 hours, add binder styrene-acrylic latex (the mass percentage of solid micelle is greater than 50%, glass transition temperature T g 4~6℃, PH=6~7.0) 9.0ml, add 0.8ml glycerin and 0.5ml dibutyl phthalate, release agent liquid paraffin 0.5ml, film-forming aid tributyl phosphate 1.0ml, magnetic After stirring for 2 hours, the viscosity of the obtained slurry was between 100-1000 mPa.s. The obtained slurry is defoamed in a vacuum and casted. After 5 hours of natural drying, it can be peeled off from the base tape, and can be wound on a paper roll to become a coil.

Embodiment 2

[0020] 100 g of Al with a median particle size of 3 μm 2 o 3 Add 20ml powder containing 0.3g dispersant PAA-NH 4 In the water, add all-acrylic latex (solid micelle mass percent content is greater than 50%, glass transition temperature T g -5°C, PH=7.0) 9.0ml, add 0.8ml of glycerin, 0.5ml of liquid paraffin, stir in the mixer for 2 hours, add 1.0ml of tributyl phosphate, and after magnetic stirring for 2 hours, the viscosity of the slurry obtained is Between 100-1000mPa.s. The obtained slurry is defoamed in a vacuum and casted. After 3 hours of natural drying, it can be peeled off from the base tape, and can be wound on a paper roll to become a coil.

Embodiment 3

[0022] 100 g of Al with a median particle size of 1 μm 2 o 3 Add 20ml powder containing 0.3g dispersant PMAA-NH 4 In the water, ball milled for 24 hours, then added styrene-acrylic latex (the mass percentage of solid colloids was greater than 50%, glass transition temperature T g 5°C, PH=7.0) 10.0ml, add 0.9ml of glycerin, 0.4ml of dibutyl phthalate, 0.5ml of liquid paraffin, 1.0ml of ethylene glycol monobutyl ether, and stir magnetically for 2 hours to obtain The slurry viscosity is between 100-1000mPa.s. All the other are with embodiment 1.

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Abstract

A process for preparing ceramic sheet (or film) by water-base doctor, blading method includes such steps as proportionally mixing water, ceramic powder, acrylate emulsoid, plasticizer, and filming assistant, stirring, ball grinding, and doctor blading. Its advantages are high drying speed, strength and toughness, and wide application range.

Description

technical field [0001] The invention belongs to the processing range of ceramic sheet materials, and in particular relates to a method for preparing ceramic sheet materials by using water as a solvent and latex as a binder by a latex water-based casting method. technical background [0002] Since the tape casting method appeared in 1945, it has been widely used in the molding process of ceramic materials, and it is now an important method for preparing large-area, thin planar ceramic materials. According to the solvents used in the current casting process, it can be divided into two types: non-aqueous series and water-soluble series. Judging from the research situation at home and abroad in recent years, the research on the casting process of non-aqueous system has been relatively mature. The prepared ceramic green sheet has uniform structure, high strength, good flexibility, easy cutting and processing, and is widely used in industrial production. However, due to the use o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/626C04B35/632
Inventor 黄勇崔学民余志勇欧阳世翕
Owner TSINGHUA UNIV
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