Abstract
Both thermosetting resins and thermoplastic resins have special desireable properties that are possessed by one, but not the other. This investigation involved a study of the development of conjugated molded parts that possess both sets of desireable characteristics as well as a study of the molds necessary for making these parts. A new molding technique has been developed in which rapid heating and coolling is performed by means of high-frequency induction heating. In this study, we report on studies using a modified technique in which the mold is heated and coolled at arbitrary times during the molding process in an ordinary injection machine combined with a high frequency generator. A high-frequency heating inductor is embedded in the mold. The molding process that was developed is as follows: (1) An uncured solution of Diallylphthalate (DAP) is sprayed onto the mold cavity surface. (2) After closing the sprayed mold, a thermoplastic is injected at ordinary resin injection temperatures (to investigate their conjugation with DAP). (3) The mold is heated by high-frequency induction heating, which cures the DAP. (4) The mold is cooled and the molded part released from the mold.
The results that were obtauned are as follows: (1) The conditions for hardening the DAP were: mold temperature 140-150°C for 1-5mins. (2) The curing of the DAP: cured by heating after the conjugation. (3) Thermoplastics capable of conjugation with DAP: SAN and ABS resins.
This method has led to the successful development of a new conjugated molding process, in which a thermoplastic resin (such as DAP) reacts and cures in the mold, while being conjugated with an injected thermoplastic resin (such as SAN or ABS).
