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Multistep drying method for gelatin casting biscuit

A drying method and a technology for green body, which are applied in the directions of drying solid materials, heating to dry solid materials, and non-heating to dry solid materials, etc., to achieve the effects of complete structure, fast drying speed and improved strength

Active Publication Date: 2012-05-30
江苏先进无机材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can ensure that deformation and cracking will not occur during the drying process of the sample, it cannot ensure that the defects introduced in the initial demolding process can be healed, and the subsequent natural drying time depends on the ambient temperature, and the drying time is too long (over 1 month), poor controllability of drying process
Not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The monomer acrylamide was dissolved in deionized water to make a 15wt% solution, and the cross-linking agent N,N'-methylenebisacrylamide (MBAM) was added. The ratio of crosslinking agent to monomer is 1:6. The dispersant tetramethylammonium hydroxide (TMAH) was then added to prepare a premix. Add silicon carbide powder and ball mill to obtain a slurry with a solid content of about 50vol%, and the viscosity of the slurry is about 300-600mPa.s. Add the initiator azo[2-(2-imidazolin-2-yl)]propane hydrochloride (AZIP·2HCl)), wherein the addition amount of the initiator is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Curing in the temperature range of 40-60 ℃ for 30-60min. Take it out, put it in a constant temperature and humidity oven after demoulding, and dry it for 24-48 hours at 50-75°C and a relative humidity of 80-95%. The second step is to continue drying in a constant temperature and humidity oven at 25-35...

Embodiment 2

[0020] The monomer methacrylamide was dissolved in deionized water to make a 15wt% solution, and the cross-linking agent N,N'-methylenebisacrylamide (MBAM) was added. The ratio of crosslinking agent to monomer is 1:3. A dispersant polyethyleneimine (PEI) was then added to prepare a premix. Add titanium carbide powder and ball mill to obtain a slurry with a solid content of about 50vol%, and the viscosity of the slurry is about 300-600mPa.s. Ammonium persulfate (APS) is added as an initiator, wherein the amount of the initiator added is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Curing in the temperature range of 40-50 ℃ for 20-60min. Take it out and get wet biscuit after demoulding. Then put the wet biscuit in a constant temperature and humidity oven, and dry it for 24-96 hours at 50-70° C. and relative humidity of 80-95%. The second step is to continue drying in a constant temperature and humidity oven at a tempe...

Embodiment 3

[0022] The monomer N,N-dimethylacrylamide was dissolved in deionized water to make a 15wt% solution, and the cross-linking agent N,N'-methylenebisacrylamide (MBAM) was added. The ratio of crosslinking agent to monomer is 1:6. Then add the dispersant tetramethylammonium hydroxide to prepare the premix. Add boron carbide powder and ball mill to obtain a slurry with a solid content of about 57vol%, and the viscosity of the slurry is about 400-600mPa.s. Azo(2-mimidylpropane) hydrochloride (AZAP·2HCl) is added as an initiator, wherein the amount of the initiator added is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Curing in the temperature range of 40-60°C for 30-90min. Take it out and get wet biscuit after demoulding. Then put the wet biscuit in a constant temperature and humidity oven, and dry it for 60-96 hours at 60-80° C. and relative humidity of 85-95%. The second step is to continue drying in a constant temperatu...

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Abstract

The invention relates to a simple and reliable multistep drying method for gelatin casting biscuit, which is characterized in that the multistep drying method comprises four steps. Firstly, the constant temperature and humidity drying proposal is adopted for promoting the effective healing of micro crackles in the biscuit. In the second step, the constant temperature and humidity drying proposal is continously adopted for preventing the biscuit from deformation and cracking in the drying process by reducing the drying temperature. In the third step, the vacuum drying method is adopted for preventing the biscuit from generating micro crackles in the moisture discharge process. Finally, the biscuit is dried for 12-24 hours in the air atmosphere and in the temperature of 80-120 DEG C. The multistep drying method provided by the invention has simple and reliable technique, is suitable for the preparation of oxide or non-oxidized blocks or porous ceramics, can effectively heal the micro crackles appeared owing to demoulding, moving and too fast volatilization of surface solvent of the wet biscuit, avoids the deformation and cracking in the drying process and ensures the gelatin castingbiscuit with high quality, no distortion and flawless to be obtained.

Description

technical field [0001] The present invention relates to a simple and reliable multi-step drying method for gel-cast biscuits. The invention belongs to the preparation technology and application field of ceramics. Background technique [0002] With the development of modern science and technology, the advanced preparation technology of high-performance ceramic components has become one of the focus and hot spots of research, especially the preparation technology of large-sized and complex-shaped products. Ceramic materials are not only prone to defects during the molding process, but also the formed defects are often difficult to make up and eliminate through subsequent processes. In addition, the high hardness and high wear resistance of ceramic materials make subsequent processing difficult and expensive. For products with complex shapes, the processing problem is particularly difficult. Therefore, molding technology, as a key link in the preparation process, directly af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B7/00F26B3/00F26B5/04C04B35/624C04B33/30
Inventor 张景贤江东亮林庆玲陈忠明黄政仁
Owner 江苏先进无机材料研究院
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