A kind of silico-molybdic acid compatibilized modified polyvinyl alcohol/starch composite material and preparation method thereof
A polyvinyl alcohol, compatibilizing modification technology, applied in the direction of climate sustainability, sustainable manufacturing/processing, biological packaging, etc. It does not have problems such as ultraviolet shielding function, and achieves excellent ultraviolet shielding performance and mechanical properties, simple and environmentally friendly preparation process, and improved compatibility.
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[0021] The preparation method of silico-molybdic acid comprises the following steps:
[0022] Dissolve sodium molybdate and sodium silicate in deionized water, heat to 80°C, and stir for 30 minutes; slowly add hydrochloric acid dropwise, control the pH of the solution to 2, and react for 3 hours; after the reaction is complete, cool to room temperature naturally, extract with ether, The lower layer of the yellow extract is released, stirred at 85°C, and after steaming excess water, it is naturally dried in an oven to obtain pure silico-molybdic acid;
[0023] The mass ratio of the sodium silicate, sodium molybdate and deionized water is 0.284:2.42:100.
Embodiment 1
[0031] A silico-molybdic acid compatibilized modified polyvinyl alcohol / starch composite material is composed of the following components in parts by weight: 80 parts of polyvinyl alcohol, 20 parts of starch, and 1 part of silico-molybdic acid.
[0032] The preparation method includes the following steps:
[0033] (1) adding 80 parts of polyvinyl alcohol to 600 parts of deionized water, stirring and dissolving at 85 ° C, to obtain a polyvinyl alcohol solution, for subsequent use;
[0034] (2) adding 20 parts of starch to 600 parts of deionized water, stirring and dissolving at 85 ° C, to obtain a starch solution, for subsequent use;
[0035] (3) 1 part of silico-molybdic acid is dispersed in 100 parts of deionized water, and ultrasonicated for 1h to obtain a silico-molybdic acid solution, which is for subsequent use;
[0036] (4) adding the starch solution obtained in step (2) and the silico-molybdic acid solution obtained in step (3) into the polyvinyl alcohol solution obtai...
Embodiment 2
[0038] A silico-molybdic acid compatibilized and modified polyvinyl alcohol / starch composite material is composed of the following components in parts by weight: 80 parts of polyvinyl alcohol, 20 parts of starch, and 2 parts of silico-molybdic acid.
[0039] (1) adding 80 parts of polyvinyl alcohol to 600 parts of deionized water, stirring and dissolving at 85 ° C, to obtain a polyvinyl alcohol solution, for subsequent use;
[0040] (2) adding 20 parts of starch to 600 parts of deionized water, stirring and dissolving at 85 ° C, to obtain a starch solution, for subsequent use;
[0041] (3) 2 parts of silico-molybdic acid are dispersed in 100 parts of deionized water, and ultrasonicated for 1h to obtain a silico-molybdic acid solution, which is for subsequent use;
[0042] (4) adding the starch solution obtained in step (2) and the silico-molybdic acid solution obtained in step (3) into the polyvinyl alcohol solution obtained in step (1), stirring and mixing for 45min at 85°C, ...
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