Preparation method of nano cellulose-mesoporous silicon dioxide composite temperature-sensitive water-absorbing microsphere

Abstract

The invention discloses a preparation method of a nano cellulose-mesoporous silicon dioxide composite temperature-sensitive water-absorbing microsphere. The preparation method comprises the following steps: performing treatment and modification on silicon dioxide through cetyl trimethyl ammonium bromide, and performing calcining together with a molecular sieve; then soaking nano cellulose in a sodium alginate solution, adding oxydol and sodium hydroxide, and performing oxidation; adding polyethyleneimine, and performing graft modification; adding the modified silicon dioxide and the molecular sieve, and preparing nano cellulose-silicon dioxide hybrid material through an electrostatic adsorption method; and performing crosslinking formation. According to the invention, the preparation process is simple; and the microsphere is simple in the process, low in cost, powerful in a water absorption function and favorable in stability, and can adsorb heavy metal ions.

Description

technical field [0001] The invention relates to the technical field of temperature-sensitive materials, in particular to a preparation method of nano-cellulose composite mesoporous silica temperature-sensitive water-absorbing microspheres. Background technique [0002] In the past ten years, the development of porous nanomaterials in pharmaceutical formulations has aroused the interest of many researchers. Due to the biocompatibility and easy degradation of cellulose, the application of cellulose in pharmacy, nanomedicine, biotechnology and other aspects has gradually become a hot spot. Composites obtained by combining mesoporous materials with cellulose have also become a hot spot for many researchers. First, cellulose is non-toxic and harmless, and silica has special properties such as high melting point, non-toxic, and high stability. Combining the two It is feasible as an auxiliary material. [0003] Now, chemical fertilizers are quite popular in agricultural planting ...

AI Technical Summary

Problems solved by technology

[0005] In Zhang Jing's "Preparation of Cellulose-Based Hybrid Materials and Research on Their Temperature-Sensitive Properties", nanocellulose suspensions were obtained by concentrated sulfuric acid pretreatment, and nanocellulose-dioxide with high specific surface area was prepared by electrostatic adsorption. Silicon hybrid materials, and the use of atom transfer radical reaction to prepare nano-cellulose temperature-sensitive materials with temperature-sensitive effects. The sustained-release properties of the samples were investigated, and it was confirmed that the nano-cellulose temperature-sensitive materials have good sustained-release properties. , but in some mechanical properties such as poor toughness, which greatly limits the application of these temperature-sensitive materials