Method of preparing polylactic acid/silicon dioxide nano composite material from acidic silicasol

Abstract

The invention discloses a preparing method of polylactic acid / silica dioxide nanometer composite material with acidic silicasol, which comprises the following steps: (1) mixing acidic silicasol lactic acid raw material under the condition of agitation and hypersonic or agitation and hypersonic; getting nanometer grade dispersing mixture; (2) dewatering and prepolying the mixture from step (1); getting lactic acid prepolymer with silica dioxide nanometer particle; (3) adding into activator; proceeding original position melting polycondensation or original position melting solid phase polycondensation; getting the product. The raw material of this invention is cheap and available, which can used to plastic, packing material, agricultural film, fiber and biological material domain.

Description

technical field [0001] The invention relates to the preparation of polymer nanocomposite materials, in particular to a method for preparing polylactic acid / silicon dioxide nanocomposite materials. Background technique [0002] Biodegradable polymer refers to that its chain structure breaks under the action of water, enzymes, microorganisms, etc., and becomes a small molecular monomer or oligomer, which is finally decomposed by microorganisms in the ecological environment and transformed into carbon dioxide and water or Biomass, or a class of polymer materials that eventually participate in the metabolic process of human and animal bodies and are converted into carbon dioxide and water and excreted from the body. Common biodegradable polymer materials include degradable natural polymers (such as cellulose, starch, chitin, chitosan, etc.), microbially synthesized polymers (such as PHBV) and chemically synthesized polymers (such as polylactic acid, polyhexene, etc.) lactones, ...

AI Technical Summary

Problems solved by technology

However, for the in-situ blending method, toxic organic solvents need to be used, and the cost of in-situ generation of nanoparticles by the sol-gel method is high; while for the in-situ ring-opening polymerization method, in order to incorporate hydrophilic The silica nanoparticles are dispersed into the hydrophobic lactide monomer, which must be hydrophobically modified in a volatile organic solvent. In addition to the inherent defects of the aforementioned ring-opening polymerization, the in-situ ring-opening polymerization method is not suitable. An ideal method for preparing polylactic acid / silica nanocomposites

Therefore, in view of the high cost of silica nanoparticles in the prior art for preparing polylactic acid / silica nanocomposites or the need to hydrophobically modify silica nanoparticles or the need to use organic solvents or long polymerization routes, etc., It is necessary to study and develop new methods for preparing polylactic acid / silica nanocomposites

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