Paramylon-based resin, molding material, molded body, and method for producing paramylon-based resin
a technology of paramylon and resin, which is applied in the field of paramylon-based resin, molding materials and molded bodies, and methods for producing paramylon-based resins, can solve the problems of low water resistance, high water absorption, and the development of new bioplastics using non-edible plant components as raw materials, and achieve excellent mechanical properties and thermoplasticity
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example 1
[0198]By treating the raw paramylon with an aqueous hydrochloric acid solution, paramylon 1 having an adjusted molecular weight was obtained. Next, paramylon 1 was acylated in a solid-liquid heterogeneous system to obtain a paramylon-based resin of this example. Specifically, the paramylon-based resin (paramylon propionate stearate) was prepared according to the following.
[0199]15 g of a raw material paramylon (weight average molecular weight: 242000) and 150 g of a 1% aqueous hydrochloric acid solution were put into a reactor, stirred at 100° C. for 4 hours, and then washed with water to obtain paramylon 1 having an adjusted molecular weight. The weight average molecular weight (Mw) of paramylon 1 was 139000.
[0200]4.5 g of paramylon 1 (in terms of dry mass, 27.8 mmol / glucose unit) was put into a reactor, dispersed in a mixture of 59 ml of N-methylpyrrolidone and 8.2 mL of pyridine under a nitrogen atmosphere, and stirred at room temperature overnight for activation.
[0201]Thereafter...
example 2
[0228]15 g of a raw material paramylon (weight average molecular weight: 242000) and 150 g of a 3% aqueous hydrochloric acid solution were put into a reactor, stirred at 100° C. for 4 hours, and then washed with water to obtain paramylon 2 having an adjusted molecular weight. The weight average molecular weight (Mw) of paramylon 2 was 83700. A paramylon-based resin (paramylon propionate stearate) was prepared according to the same amount and method as in Example 1 except that paramylon 1 was changed to paramylon 2 (yield amount: 9.3g, yield: 99%).
[0229]The obtained paramylon-based resin (paramylon propionate stearate) was measured by 1H-NMR in the same manner as in Example 1, and as a result, DSLo was 0.14, and DSSh was 2.4.
[0230]Further, this paramylon-based resin was evaluated for mechanical characteristics such as impact strength and flowability in the same manner as in Example 1. The results are shown in Table 1.
example 3
[0231]15 g of a raw material paramylon (weight average molecular weight: 242000) and 150 g of a 3% aqueous hydrochloric acid solution were put into a reactor, stirred at 100° C. for 6 hours, and then washed with water to obtain paramylon 3 having an adjusted molecular weight. The weight average molecular weight (Mw) of paramylon 3 was 71200. A paramylon-based resin (paramylon propionate stearate) was prepared according to the same amount and method as in Example 1 except that paramylon 1 was changed to paramylon 3 (yield amount: 8.9 g, yield: 93%).
[0232]The obtained paramylon-based resin (paramylon propionate stearate) was measured by 1H-NMR in the same manner as in Example 1, and as a result, DSLo was 0.16, and DSSh was 2.5.
[0233]Further, this paramylon-based resin was evaluated for mechanical characteristics such as impact strength and flowability in the same manner as in Example 1. The results are shown in Table 1.
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