Styrene resin, styrene resin composition, molded article thereof, and styrene resin production method
A technology of styrene-based resin and manufacturing method, which is applied in the field of styrene-based resin, can solve the problems of large specific weight and poor dimensional stability, and achieve the effects of low outgassing, excellent hot water resistance, and excellent mold release performance
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Embodiment 1～5 and comparative example 1～4
[0265]
[0266] The styrene resin of this invention and its manufacturing method are demonstrated concretely.
[0267] The cleaned fully mixed tank reactor with double helical blades (inner diameter 550 mm, height 1155 mm, inner volume 254 liters) was heated to 90° C., and dried in vacuum for 3 hours. Next, after the pressure of the reactor was restored with nitrogen, the temperature was lowered to 80°C. 60 kg of fully dried SPS powder was put into the reactor by circulation treatment with dry nitrogen gas in advance, and dried under nitrogen gas flow for 2 hours. Next, stirring was started, and the temperature in the reactor was adjusted to 70°C. After that, styrene monomer and catalyst were started to be fed. The types and ratios of the respective catalysts and the amounts of added hydrogen are shown in Tables 1 and 2 below. In the table, "SM" represents a styrene monomer.
[0268] Simultaneously with the introduction of the styrene monomer and the catalyst, the supply...
Embodiment 6～13 and comparative example 5～11
[0289] Components other than the glass filler were blended at the ratios shown in Table 3, and dry-blended with a Henschel mixer. Next, using a twin-screw extruder, the resin composition was kneaded while side-feeding 30% by mass of the glass filler described in Table 3 with respect to 70% by mass of the thermoplastic resin composition after dry blending, and pellets were produced. . Using the obtained pellets, test pieces used in the following tests were molded with an injection molding machine SH100A (resin temperature: 300° C., mold surface temperature: 150° C.) manufactured by Sumitomo Heavy Industries, Ltd.
[0290] 5. Hot water resistance test (pressure cooker test)
[0291] Under the above molding conditions, a molded product of an ASTM D638 Type I tensile test piece was obtained. The obtained test piece was put into the mesh cage made of stainless steel in which the stainless steel wire was drawn so that the test piece may not contact. This cage was put into a press...
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Abstract
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