Patent ID: 11920031
Assignee: XIHUA UNIVERSITY
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A preparation method of a high ultraviolet blocking polylactic acid composite material reinforced by polyhedral oligomeric silsesquioxanes (POSS) modified bamboo powder, comprising the following steps:
(1) adding bamboo powder with particle sizes ranging from 400-2,000 mesh to 0.5-0.8 mol/L NaOH solution, stirring for 3-5 h at temperatures of 70-80° C., washing and filtering, and then drying to remove water;
(2) adding modified POSS into a tetrahydrofuran solvent under stirring, where the proportion of the modified POSS to the tetrahydrofuran solvent ranges from 1 g: 200 mL-1 g: 400 mL, after stirring evenly, adding the bamboo powder obtained in the step 1 to the same tetrahydrofuran solvent, the proportion of the bamboo powder obtained in the step 1 to the tetrahydrofuran solvent ranges from 1 g: 20 mL-1 g: 40 mL, continuously stirring the solution for 3-4 h at temperature of 50-80° C., during which a condensation reflux device is used to prevent solvent loss; and the modified POSS is selected from one or a mixture more of glycidyl modified POSS, methacrylic modified POSS and maleamic acid modified POSS;
(3) upon completion of the stirring reaction, filtering a reaction product and washing it with a tetrahydrofuran solvent, and drying to remove the tetrahydrofuran solvent to obtain POSS modified bamboo powder (POSS-BP); and
(4) mixing the POSS-BP obtained in the step 3 with polylactic acid according to a mass ratio of 2: 98-10:90, after mixing evenly, carrying out the melt-mixing and co-extrusion, cooling and pelletizing in a water bath and then drying to obtain the POSS-BP modified PLA composite material.