Molded polyester for housing
A polyester and polymer technology, used in the field of biodegradable plastic materials and biodegradable plastic moldings, can solve the problems of reduced molecular weight and difficult shell materials
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[0071] As a preferred preparation method of the phenolphthalein solution, a method of dissolving 0.025 g of phenolphthalein in 22.5 mL of EtOH (95%) and adjusting to 25 mL with ion-exchanged water can be mentioned. The reagent is colorless when the pH of the solution is below 8.3, and turns red when the pH is 8.3-10.0.
[0072] As a preferred preparation method of the phenol red solution, a method of dissolving 0.025 g of phenol red in 5 mL of EtOH (95%) and adjusting to 25 mL with ion-exchanged water can be mentioned. The reagent is yellow when the pH of the solution is below 6.8, and red when the pH is above 8.4.
[0073] As a preferred method of measuring the acid value using the prepared reagent, for example, 0.1 mg of polylactic acid, which is a biodegradable polyester material, is accurately weighed, dissolved in 10 mL of chloroform, and 10 mL of benzyl alcohol is added. Using phenol red as an indicator, the method of titrating with 0.02N KOH-EtOH solution from yellow t...
Embodiment 1
[0101] Add 1% by weight of carbodiimide (trade name: Carbodilite 10B, manufactured by Nisshinbo Co., Ltd.) as a compound that can react with active hydrogen to polylactic acid (trade name: Lacea H100T, manufactured by Mitsui Chemicals Co., Ltd.). Knead at the kneading temperature for 5 minutes. The acid value dropped from 1.8 to 0.1. The kneaded product was processed into a plate shape with a square of 5 cm and a thickness of 1 mm, and aged at 80° C. and a humidity of 80% for 48 hours. The acid value rises below 0.2, and the molecular weight decreases within 10%.
Embodiment 2
[0103] In the same manner as in Example 1, the amount of carbodiimide added was changed to 0.5% by weight or 0.8% by weight, and kneading was performed to prepare test pieces. The acid value was 0.8 when 0.5% by weight of carbodiimide was added, and 0.5 when 0.8% by weight was added. As a result of aging at 80° C. and a humidity of 80% for 48 hours, the acid value of the sample added with 0.8% by weight of carbodiimide increased by 0.2 or less, and the molecular weight decreased within 10%. On the other hand, in the case of adding 0.5% by weight of carbodiimide to the sample, the acid value increased from 0.8 to 5.2, and the molecular weight decreased by 60%.
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