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Temperature response gel injection molding and shaping method capable of quickly drying green body

A gel injection molding and temperature-responsive technology, applied to ceramic molding machines, manufacturing tools, etc., can solve problems such as drying difficulties, and achieve the effects of easy drying, high efficiency, and simple operation

Inactive Publication Date: 2011-11-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose an improved gel injection molding technology - rapid temperature response gel injection molding, that is, introducing a hydrophilic-hydrophobic substance that responds to temperature stimulation into the gel system of gel injection molding. The polymer branched chain of the transformation characteristic, so as to achieve the purpose of using the gel casting body prepared by the gel system and quickly drying it under certain temperature conditions. The ceramic body formed by the present invention can be quickly (≤5 hours) is dried quickly, thus solving the difficult problem of drying the traditional gel injection molding body

Method used

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  • Temperature response gel injection molding and shaping method capable of quickly drying green body
  • Temperature response gel injection molding and shaping method capable of quickly drying green body
  • Temperature response gel injection molding and shaping method capable of quickly drying green body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0037] Examples 1-6, using a gel system composed of acrylamide, methylene bisacrylamide and polyethylene oxide monomethyl ether macromonomer to prepare ZrO 2 ceramics

[0038] First synthesize polyoxyethylene monomethyl ether macromonomer (PEO macromonomer): add azobisisobutyronitrile (0.1g ), triethylamine (3mL) and acryloyl chloride (5mL). Then, the vigorously stirred solution was placed in a water bath at 60° C. for 15 hours. After the reaction, the precipitate produced by the reaction was filtered out by vacuum filtration. Finally, the product in the filtrate is washed out with ether, which is the PEO macromonomer.

[0039] Monomer acrylamide, crosslinking agent methylenebisacrylamide (MBAM), branched PEO macromonomer, dispersant polyammonium methacrylate (10g), Y 2 o 3 Stable ZrO 2 Powder (1000g) was added into 250mL water and ball-milled together to prepare a suspension, then vacuum degassed for 30 minutes, then added initiator ammonium persulfate (concentration 10...

Embodiment 7～12

[0041] Examples 7-12, Al 2 o 3 ceramics

[0042] First synthesize isopropylacrylamide macromonomer (IPAM macromonomer): N-isopropylacrylamide (20g), 2-aminoethanethiol (0.1g) and azobisisobutyronitrile (0.02g) Dissolve it in N,N'-dimethylformamide (100 mL), and place it in a water bath at 50° C. for 10 h after the solution becomes transparent. After the reaction, the solution was washed several times with ether to obtain a white powdery product. The product (2 g) was dissolved in 60 mL of DMF, and a certain amount of N-acryloyloxysuccinimide (4 g) was added, and the resulting solution was reacted at 1° C. for 15 h. Finally, the reaction product in the solution is washed out with diethyl ether, and the resulting product is the IPAM macromonomer.

[0043] Monomer methacrylamide, crosslinking agent methylenebisacrylamide, branched chain IPAM macromonomer, dispersant polyacrylic acid ammonium (2g), Al 2 o 3 Powder (200g) and sintering aid MgO (2g) were added to 50mL water an...

Embodiment 13

[0045] Example 13, Si 3 N 4 ceramics

[0046] Synthesize polyoxyethylene monomethyl ether macromonomer (PEO macromonomer) at first: add azobisisobutyronitrile (5g) in tetrahydrofuran (100mL) of polyoxyethylene monomethyl ether (10g) with a molecular weight of 10000 , triethylamine (10 mL) and acryloyl chloride (20 mL). Then the solution was placed in a water bath at 45° C. to react for 10 hours. After the reaction, the precipitate generated by the reaction was filtered off. Finally, the product in the filtrate is washed out with ether, which is the PEO macromonomer.

[0047] Monomer methacrylamide (5g), crosslinking agent methylene bisacrylamide (0.5g), branched PEO macromonomer (3g), dispersant PEI (20g), Si 3 N 4 Powder (500g) and sintering aid Y 2 o 3 (4g) and La 2 o 3 (6g) was added into 50mL water and ball milled together to prepare a suspension, then vacuum degassed for 20 minutes, then added initiator ammonium persulfate (concentration 8%, 20mL) and catalyst N...

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Abstract

The invention relates to a temperature response gel injection molding and shaping method capable of quickly drying a green body. In the method, a polymer branched chain which has the characteristic of hydrophilic-hydrophobic conversion and is responded by thermal stimulus is introduced into a gel system for gel injection molding, thereby achieving the purposes that the gel system is used for preparing a gel injection molding green body, and the gel injection molding green body can be quickly dried at a certain temperature. The invention also discloses several gel systems with the characteristics. Each gel system is composed of a monomer, a cross linking agent and a branched chain. The ceramic green body shaped with the method can be quickly dried in short time (less than or equal to five hours) so as to solve the problem that the traditional gel injection molding and shaping green body is difficult to dry. In addition, the method has the characteristics of high efficiency, small energy consumption and the like, is simple to operate and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of ceramic molding, and relates to a temperature-responsive gel injection molding method capable of rapidly drying a green body. Background technique [0002] In order to overcome the shortcomings of injection molding technology, Janney and Omatete of Oak Ridge National Laboratory (Oak Ridge National Laboratory, ORNL) invented a new ceramic molding technology - gel injection molding technology [US Patent, 5145908, 1992 】. It cleverly combines traditional ceramic technology and polymer chemistry, and is a new near-net-shaping technology for preparing high-quality complex-shaped ceramic parts. Compared with other molding technologies, gel injection molding technology has a series of advantages: 1) It has a wide range of applications and has no special requirements for powder; 2) It can achieve near-net size molding and prepare parts with complex shapes; 3) The green body has high strength, which is obviously...

Claims

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Application Information

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IPC IPC(8): C04B35/622B28B1/14
Inventor 王日初王小锋彭超群
Owner CENT SOUTH UNIV