Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-11-07
1998-12-29
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
106 3822, B29C 3358
Patent
active
058536469
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL FIELDS WHERE THE INVENTION CAN BE UTILIZED
The present invention relates to a molding method wherein resin, rubber and so on are molded by a metal mold using a water-based mold releasing agent, and relates to a dilution agent for a mold releasing agent which is used for the molding method.
PRIOR ART
Ordinally, in order to obtain a molded article of resin, rubber and so on, first of all, a mold releasing agent is coated on a metal mold and molding compositions is put therein so that the molding compositions is turned to a solid molded article, then the solid molded article is released from the metal mold.
There are many kinds of mold releasing agents to be used for such molding, for example, a wax-type, a silicone-type, a fluorine-containing-type and so on, and these agents, when used, are in the forms dispersed or dissolved in an organic solvent or water.
A mold releasing agent of the organic solvent is generally easy to use because the wettability to the metal mold and drying ability are good based on the property of the organic solvent.
But, a water-based mold releasing agent has been strongly requested to be used in view of recent global environments and working environments, because of the problems, for example, of the destruction of the ozone layer by trichloro-trifluoroethane (Flon 113), the poisoning by a chlorine-containing solvent, the flammablility and poisoning by a petroleum-based solvent.
On the other hand, a water-based mold releasing agent is ordinary used in a manner that it is diluted to a suitable concentration with water at its using sites when it is used.
But, the mold releasing agent based on the organic solvent has been generally used when the temperature of the metal mold is not more than 100.degree. C., because water has larger evaporation latent heat and poorer drying property than the organic solvent. And, in the case of diluting, it tends to considerably lower the mold releasability than the mold releasing agent based on the organic solvent.
With regard to this, a molding method in which mold releasing agent is diluted with the surfactant and water to prepare water-based molding agent for use has been known (Japanese Patent Publication No. 32513/1984, and Japanese Patent Publication No. 26601/1989). In this case, the drying ability and the mold releasability are improved, and it can be used under the low temperature such as under a low temperature of not more than 100.degree. C., compared with the case of dilution by only water.
It is understood that this is because the diluted water-based mold releasing agent contains a surfactant, the wettability to the mold is improved, and because the mold releasing agent does not form a drop-like shape of water, it becomes a uniform thin membrane to improve the drying ability. Simultaneously with those, the mold releasability and the mold contamination are improved.
However, it is generally used as the mold releasing agent, for example, wax, silicone oil, silicone resin or perfluoroalkyl-containing compound emulsioned by a surfactant.
Accordingly, because the surfactant is contained in the mold releasing agent before diluting , it is generally seemed to be the same as the case of dilution by only water, but in the actual molding process, the optimal dilution ratio is generally changed according to the difference of molding compositions or the shape of the metal mold even in the case of using the same mold releasing agent. So, the wettability to the mold has been largely different according to the dilution ratio. This is also appeared in the molding method in which the mold releasing agent is diluted for using by a surfactant and water, as disclosed in Japanese Patent Publication No. 32513/1984 and Japanese Patent Publication No. 26601/1989.
OBJECTIVES OF THE INVENTION
An object of the present invention is to provide a molding method in which good wettability to the mold, drying ability and mold releasability can be always obtained with good reproducibility, and to provide a dilution agent for a mold releasing agent which is
REFERENCES:
patent: 3893868 (1975-07-01), Klement et al.
patent: 4118235 (1978-10-01), Horiuchi et al.
patent: 5601774 (1997-02-01), Kohama et al.
Aga Tsukasa
Yamana Masayuki
Daikin Industries Ltd.
Vargot Mathieu D.
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