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Nano microcrystalline cellulose/layered silicate hybrid and preparation method thereof

A layered silicate and nano-crystal technology, applied in the field of nano-materials, can solve the problems of poor thermal stability of nano-microcrystalline cellulose, achieve thermal stability and excellent mechanical properties, reduce agglomeration, and improve thermal stability Effect

Inactive Publication Date: 2017-09-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent of the present invention provides a nano-microcrystalline cellulose / layered silicate hybrid and its preparation method, which can effectively overcome the problem of poor thermal stability of nano-microcrystalline cellulose and obtain an organic-inorganic hybrid with better performance nanofillers

Method used

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  • Nano microcrystalline cellulose/layered silicate hybrid and preparation method thereof
  • Nano microcrystalline cellulose/layered silicate hybrid and preparation method thereof
  • Nano microcrystalline cellulose/layered silicate hybrid and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] The cotton straw is hydrolyzed with concentrated sulfuric acid to obtain the cotton straw nano microcrystalline cellulose, and the nano microcrystalline cellulose powder is obtained after freeze-drying.

[0030] In terms of parts by mass, disperse 1.5 parts of cotton straw nano-microcrystalline cellulose hydrolyzed by sulfuric acid in 10 parts of deionized water and 15 parts of ethanol mixture, mix evenly, then add 0.1 part of potassium hydroxide, and ultrasonically stir at 30 °C After reacting for 1.5h, fluffy alkalized nanocellulose was prepared;

[0031] In terms of parts by mass, add 0.5 parts of (3-chloro-2-hydroxypropyl) trimethylammonium chloride solution with a mass fraction of 65%, and etherify at 50°C for 3 hours to prepare cationic nanocrystalline fibers Primer dispersion.

[0032] The sodium-based montmorillonite and the obtained dispersion were ultrasonically treated for 50 minutes at a pH of 8, and mixed uniformly to prepare a layered silicate with a mass...

Embodiment 2

[0044] The bagasse powder is hydrolyzed with concentrated sulfuric acid, and the nano-microcrystalline cellulose powder is obtained after freeze-drying.

[0045] In terms of parts by mass, 1 part of nanocrystalline cellulose was dispersed in 5 parts of deionized water and 15 parts of isopropanol solution, 0.15 parts of sodium hydroxide was added, and ultrasonic treatment was performed at room temperature for 1 h;

[0046] In terms of parts by mass, 0.6 parts of an aqueous solution of glycidyl trimethyl chloride of 65 wt % was added, and reacted in a water bath at 45° C. for 5 hours to obtain a cationized nanocellulose dispersion;

[0047] The sodium-based montmorillonite and the obtained dispersion were ultrasonically treated for 80 minutes at a pH of 10, and mixed uniformly to prepare a layered silicate with a mass percentage concentration of 1% and a cationic nanocellulose mass percentage concentration of 1%, and then Place it in an oil bath at 50° C. for 24 hours with magneti...

Embodiment 3

[0049] The wood powder is hydrolyzed with concentrated sulfuric acid, and the nano-microcrystalline cellulose powder is obtained after freeze-drying.

[0050] In terms of parts by mass, 1 part of nanocrystalline cellulose is dispersed in a mixed solution of 20 parts of deionized water and 10 parts of ethanol, 0.15 parts of sodium hydroxide is added, and ultrasonic treatment is performed at room temperature for 2 hours;

[0051] In terms of parts by mass, add 0.6 parts of 40wt% (3-chloro-2-hydroxypropyl) trimethylammonium chloride aqueous solution, and react for 5 hours at 45°C in a water bath to obtain a cationic nanocellulose dispersion;

[0052] The calcium-based montmorillonite and the obtained dispersion were ultrasonically treated for 50 minutes at a pH of 5, and mixed uniformly to prepare a layered silicate with a mass percentage concentration of 1% and a cationic nanocellulose mass percentage concentration of 1%, and then Place it in an oil bath at 50° C. for 24 hours w...

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Abstract

The invention discloses a nano microcrystalline cellulose / layered silicate hybrid and a preparation method thereof. According to the preparation method, sulfuric acid is utilized to carry out hydrolysis to prepare nano microcrystalline cellulose at first; then nano microcrystalline cellulose is dispersed in a diluent and a catalyst to carry out an alkalization treatment; a cationic etherifying agent is added then, fibers and the etherifying agent are evenly mixed and carry out reactions in the presence of an alkaline catalyst to prepare a cationic cellulose dispersion liquid; and different kinds of layered silicate and the cationic microcrystalline cellulose dispersion liquid are mixed to carry out intercalation reactions to obtain the nano microcrystalline cellulose / layered silicate hybrid. The used layer silicate is cheap and easily available and is suitable for the preparation of nano microcrystalline cellulose organic-inorganic hybrids prepared from various natural plant fibers; through hybridization, the thermal stability of nano cellulose is effectively improved, the intercalation of layered silicate is realized, and the one-dimensional and two-dimensional nano filling materials are hybridized into hybrids with multiple dimensions.

Description

technical field [0001] The invention relates to nano-microcrystalline cellulose, in particular to a nano-microcrystalline cellulose / phyllosilicate hybrid and a preparation method thereof, belonging to the field of nanomaterials. Background technique [0002] Nanocrystalline cellulose comes from natural high molecular polymers. It has the characteristics of low cost, high strength, lightness, economy, and environmental protection. Its theoretical Young's modulus is 250GPa and its specific tensile strength is 5200kN m / kg. It is a metal titanium 18 times that of nanocrystalline cellulose, and has special physical and optical properties. Due to its unique properties, research on nanocrystalline cellulose has attracted much attention in recent years. Nano-microcrystalline cellulose is widely used in composite materials, papermaking, food, medicine and other fields, and nano-microcrystalline cellulose is used as a reinforcement in polymer materials to prepare nanocomposites is one...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/08C08K3/34C08B15/06C08B15/02
CPCC08B15/02C08B15/06C08K3/346C08K2201/011C08K2201/014C08L1/08
Inventor 何慧孟淑娜陈剑黄柏王炳程
Owner SOUTH CHINA UNIV OF TECH
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