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Process for producing molded article

a technology of molded articles and molded parts, which is applied in the direction of manufacturing tools, ceramic shaping equipment, ceramic shaping linings, etc., can solve the problems of deterioration of surface properties of molded articles, and achieve the effect of reducing surface voids

Inactive Publication Date: 2003-11-13
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enables the production of molded articles with shapes accurately corresponding to the mold's inner surface without surface voids, enhancing the surface properties and appearance of the molded articles.

Problems solved by technology

However, when a mold releasing agent is applied to the inner surface of a mold having a complicated shape on its inner surface, and a molded article is produced, the surface properties of the molded article are sometimes deteriorated because so-called surface void, i.e. surface defect caused by insufficient filling of the liquid starting materials and / or foams into the mold having a complicated shape on its inner surface is generated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 2

[0052] (Preparation of Liquid Molding Material for Polyester Polyurethane Foam)

[0053] In a mixer (Model "DH-2.5," manufactured by Tokushu Kika Kogyo K. K.) were previously stirred 50 parts by weight of a polyol solution [trade name: "EDDYFOAM AS-1210U," manufactured by Kao Corporation], comprising a polyester-polyol, a chain extender, water and a foam stabilizer (a surfactant), and 50 parts by weight of an isocyanate prepolymer [trade name: "EDDYFOAM B-2009," manufactured by Kao Corporation], main constituents of which were a polyester-polyol and 4,4-diphenylmethane diisocyanate, and the resulting mixture was evacuated in a desiccator.

[0054] The resulting liquid mixture was used to measure a contact angle in accordance with the following method for measurement of a contact angle. As a result, the contact angle was found to be 46.degree..

[0055] The viscosity of this liquid mixture gradually increases. Therefore, the time period from the previous stirring of the polyol solution and th...

examples 21 and 22

[0080] [Production of Molded Articles Made of Polyester Polyurethane Foam]

[0081] The same procedures as in Examples 5 to 8 were carried out except that spraying of the mold releasing agent on the mold for testing was omitted and that the surface-treating agents shown in Table 2, which were previously admixed together at 25.degree. C. were used, to produce a molded article made of a polyurethane foam. Each of the resulting molded articles had a density of about 0.65 g / cm.sup.3 and hardness (Asker C) of 80.+-.2.

[0082] The releasing property after production and the shape transfer ratio of the resulting molded article made of a polyurethane foam were evaluated in the same manner as above. The results are shown in Table 2.

[0083] In Table 2, the following mold releasing agents were used: Mold releasing agent A: [trade name: "SUPER OIL B," manufactured by NOF Corporation]; Mold releasing agent B: dimethyl silicone oil [trade name: "TSF-451-50," manufactured by Toshiba Silicone Co., Ltd.];...

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Abstract

A process for producing a molded article comprised of polyurethane is provided, comprising the steps of pouring or injecting a liquid molding material into a mold under the condition that the contact angle between the liquid molding material and the inner surface of the mold is adjusted to not more than 30° by applying the surface-treating agent to the inner surface of the mold, and curing the liquid molding material. A surface-treating agent is also provided which reduces the contact angle between the liquid molding material and a flat plate made of the same material as the mold to not more than 30°. when the surface-treating agent is applied to the flat plate and the liquid molding material is dropped thereon.

Description

[0001] The present invention is directed to a process for producing a molded article, and more particularly to a process for producing a molded article, capable of producing a molded article having a shape accurately corresponding to the shape of an inner surface of a mold, and a surface-treating agent used in the process.[0002] When a molded article is produced by pouring or injecting a liquid molding material into a mold, and curing the liquid molding material, a mold releasing agent has been hitherto applied to the inner surface of the mold in order to easily release a molded article from the mold.[0003] However, when a mold releasing agent is applied to the inner surface of a mold having a complicated shape on its inner surface, and a molded article is produced, the surface properties of the molded article are sometimes deteriorated because so-called surface void, i.e. surface defect caused by insufficient filling of the liquid starting materials and / or foams into the mold havin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C33/60B29C33/64B29C67/20B29C67/24C08J5/00
CPCB29C33/60B29C67/246B29C33/64
Inventor OKUBO, MAKOTOKIUCHI, KAZUHIKOHASHIMOTO, RYOICHINOMURA, TAKAYUKIMORI, MASAHIROMIYAMOTO, KENICHI
Owner KAO CORP