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Extrusion or injection molding composition and method for preparing molded part

A technology of extrusion molding and injection molding, which is applied in the direction of ceramic molding machines, manufacturing tools, ceramic products, etc., and can solve the problems that depend on the shape and size of ceramic particles, unpredictable effects, and inability to achieve effects, etc.

Inactive Publication Date: 2007-12-19
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with all these methods, a problem remains: as mentioned above, depending on the shape and size of the ceramic particles, it is impossible to sufficiently produce the desired effect
but it doesn't achieve the desired effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] In the preparation of methylcellulose, in addition to methyl chloride or dimethyl sulfate, mixed ethers such as hydroxypropylmethylcellulose and hydroxypropylmethylcellulose can also be prepared by reacting ethylene oxide or propylene oxide. Ethyl methylcellulose. A hydroxyl group having a degree of substitution of 19-30 wt% of methyl groups and a degree of substitution of 4-12 wt% of hydroxyethyl or hydroxypropyl groups and a viscosity of 50-200,000 mPa.s in a 2 wt% aqueous solution at 20°C can be used. Ethyl methylcellulose and hydroxypropyl methylcellulose. The degree of substitution and viscosity can be measured by the method described in "Japanese Pharmacopoeia", 14th edition. These cellulose ethers with a degree of substitution outside the range defined above may be insufficiently water soluble and fail to develop sufficient cohesion when drying molded ceramic parts. A viscosity that is too low may result in insufficient cohesion, while at a viscosity that is to...

Embodiment 1-9

[0030] To 100 parts by weight of alumina particles (obtained from Admatechs Co., Ltd.) with an average particle diameter of 0.4-13 μm and a sphericity shown in Table 1 (obtained from Admatechs Co., Ltd.), 2.0-10.0 parts by weight of of cellulose ether and water in the amounts shown in Table 1. They were mixed in Super-Mixer (Kawada Mfg. Co., Ltd.) by driving stirring blades at 1000 rpm, and then at 15° C. on a small three-roll mill (Inoue Mfg. Co. Ltd.). The resulting compound was extrusion-molded into a billet honeycomb member using a laboratory honeycomb extruder (Miyazaki Iron Works Co., Ltd.) with a honeycomb die having rib lines of 0.2 mm Thickness (rib gage), rib line spacing of 5mm and diameter of 20mm. It was dried at 100°C for 16 hours. After drying, the honeycomb structure was heated at 500°C for 2 hours, the binder was burned off and sintered in an electric furnace at 1700°C.

[0031] In all the molding trials of Examples 1-9 shown in Table 1, no parting or rib l...

Embodiment 10-18

[0053] In these examples, the compounds of Examples 1-9 were extruded into a honeycomb member through a honeycomb die having a rib line thickness of 0.1 mm, a rib line spacing of 4 mm, and a diameter of 20 mm , and dried at 100°C for 16 hours. After drying, the honeycomb member was heated at 500°C for 2 hours to burn off the binder and sintered in an electric furnace at 1700°C.

[0054] In all molding trials of Examples 10-18, no parting waves were obtained during molding, especially near the outer periphery, and after molding, no cracking occurred during the drying step ceramic honeycomb components.

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Abstract

In an extrusion or injection molding composition comprising water-insoluble particles, a water-soluble binder, and water, true spherical particles having an average particle size of 0.2-20 mum are used as the water-insoluble particles. The addition of a small amount of a binder to water-insoluble particles as the substrate facilitates molding operation and enables to produce a molded part featuring a shape stability after molding.

Description

technical field [0001] The present invention relates to extrusion or injection molding compositions for the production of molded parts of desired shape from powders of desired materials, and to methods of making molded parts using the compositions. Background technique [0002] Typically, molded parts of the desired shape are produced by molding the pulverized material and the binder into the desired shape so that the binder develops sufficient cohesion to retain the shape. In molding ceramics in this manner, the molded part is sintered while the binder is removed. [0003] Depending on the desired shape to be molded, a suitable molding technique may be selected from a molding technique of mixing pulverized material and a binder, and compression molding the mixture; and dissolving the binder in a solvent, The pulverized material is mixed with this solution, and in the case of sheet-like form, the mixture is sheeted to the desired thickness and the molding technique is to ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/26B29C47/00B29C45/00
CPCC04B2111/00793B28B1/24B28B3/20C03C12/00C04B2111/00129C04B35/10C04B2111/0081C04B38/0006C04B2111/2084C04B38/0054C04B38/0645C08K7/22C08L1/10
Inventor 早川和久新延信吾
Owner SHIN ETSU CHEM IND CO LTD
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