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Gel casting method for free radical system

A gel injection molding and free radical technology, which is applied in the field of free radical system gel injection molding, prevents the surface polymerization of free radical system gel injection molding slurry from inhibiting, and can solve the problem of unfavorable gel injection molding process control. , the influence of solid content and gel curing process, debonding and unfavorable sintering, etc., to achieve the effect of easy operation, low cost, easy removal and recycling

Active Publication Date: 2016-08-03
中国科学院上海硅酸盐研究所苏州研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the additives have an impact on the composition, solid content and gel curing process of the slurry, which is not conducive to the control of the gel injection molding process
Also not good for subsequent debonding and sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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 crosslinker 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. The initiator azo[2-(2-imidazolin-2-yl)]propane hydrochloride (AZIP·2HCl)) is added, wherein the added amount of the initiator is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Pour n-pentanol to cover the surface of the slurry. Put it into a constant temperature water bath at 45 degrees to cure for 2 hours. Open the mold when the sample has cooled to room temperature. A green body with complete surface curing and uniform structure is obtained.

Embodiment 2

[0035] 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 crosslinker 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 added amount of the initiator is 1 / 10 to 1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Pour n-hexanol to cover the surface of the slurry. Put it in a constant temperature water bath at 50°C for 2 hours. Open the mold when the sample has cooled to room temperature. A green body with complete surface curing and uniform structure is obtained.

Embodiment 3

[0037] 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 crosslinker 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 added amount of the initiator is 1 / 10-1 / 15 of the monomer. Stir vigorously and defoam after addition. Then pour into molds as needed. Pour n-heptanol to cover the surface of the slurry. Put it into a constant temperature water bath at 55 degrees to cure for 2 hours. Open the mold when the sample has cooled to room temperature. A green body with complete surface curing and uniform structure is obtained.

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Abstract

The invention relates to a gel casting method for a free radical system.The method comprises the steps that slurry containing water, a dispersing agent, organic monomers, a cross-linking agent and ceramic powder is prepared; after an initiating agent is added into the slurry, the mixture is stirred, defoamed and injected into a mold, the surface of the slurry is covered with an anti-surface polymerization inhibition reagent, and then curing is conducted, wherein C5-C11 monohydric alcohol which has hydrophilic groups and hydrophobic chains and achieves the effect of a surfactant is adopted as the anti-surface polymerization inhibition reagent, the hydrophilic groups directly make contact with ceramic slurry, the hydrophobic groups tend to spread in air to form a film layer on the surface of the slurry to effectively isolate oxygen in the air, and the anti-surface polymerization inhibition reagent is one of or a combination of more than two of n-amyl alcohol, isoamyl alcohol, n-hexyl alcohol, n-heptanol, n-caprylic alcohol, n-nonyl alcohol, decanol and undecyl alcohol.Accordingly, the slurry and oxygen in the air can be effectively isolated, and curing of the slurry on the surface layer is guaranteed.

Description

[0001] This application is a divisional application of the invention patent application with the application number 201310190594.2, the application date is May 21, 2013, and the invention title is "A Method for Gel Injection Molding of Free Radical System". technical field [0002] The invention relates to a method for free radical system gel injection molding, in particular to a method for preventing polymerization inhibition on the surface of free radical system gel injection molding slurry, and belongs to the field of preparation technology and application of ceramics. Background technique [0003] 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 ...

Claims

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Application Information

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IPC IPC(8): C04B35/632C04B35/634C04B35/56C04B35/563C04B35/565
CPCC04B35/5611C04B35/563C04B35/565C04B35/632C04B35/63444C04B2235/6023
Inventor 张景贤江东亮林庆玲陈忠明刘学建黄政仁
Owner 中国科学院上海硅酸盐研究所苏州研究院
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