Polyhydroxy lignin/silicon dioxide composite nano particle and preparation method thereof

A technology of composite nanoparticles and silica, which is applied in the field of polyhydroxylignin/silica composite nanoparticles and its preparation, can solve uneven dispersion, serious agglomeration of polyhydroxylignin/silica composite particles, and toxicity Organic solvents and other problems, to achieve the effect of simple process, excellent performance-price ratio and high efficiency

Active Publication Date: 2015-01-28
SOUTH CHINA UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0010] Another object of the present invention is to provide a polyhydroxylignin/silicon dioxide composite particle that can overcome the problems of serious agglomeration, uneven disper

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  • Polyhydroxy lignin/silicon dioxide composite nano particle and preparation method thereof
  • Polyhydroxy lignin/silicon dioxide composite nano particle and preparation method thereof
  • Polyhydroxy lignin/silicon dioxide composite nano particle and preparation method thereof

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preparation example Construction

[0031] The present invention relates to a kind of preparation method of polyhydroxy lignin / silicon dioxide composite nano material, and this method comprises the following steps:

[0032] (1) adding industrial lignin to water to achieve a mass percentage concentration of industrial lignin based on the total mass of the industrial lignin aqueous solution is 10-40%, then adjusting the pH of the solution to 8-12; adding polyols and catalysts, heating At 70-90°C, dropwise add epoxy haloalkane, and at the same time add dropwise alkaline regulator to maintain the pH of the reaction solution at 8-12, and carry out the reaction for 2-4 hours to obtain a polyhydroxy lignin solution;

[0033] Industrial lignin mainly comes from the cooking wastewater of the paper pulping industry. According to different raw materials, pulping process and extraction methods, their physical and chemical properties vary greatly. Industrial lignin is usually divided into four categories: ①Hydrolyzed lignin: ...

Embodiment 1

[0061] Add 100g of wood pulp alkali lignin into water to reach a mass percentage concentration of wood pulp alkali lignin based on the total mass of the wood pulp alkali lignin aqueous solution to be 10%, then adjust the pH of the solution to 8, add 10g of pentaerythritol and 0.5g Potassium iodide, warming up to 70°C, adding dropwise 5g of epibromohydrin, and simultaneously adding dropwise a sodium hydroxide solution with a mass percentage concentration of 20% to maintain the pH of the reaction solution at 8, and react for 2 hours to obtain a polyhydroxy lignin solution; Prepare a sodium silicate aqueous solution with a mass concentration of 1%, and add the polyhydroxylignin solution obtained above to it, mix it uniformly, adjust the pH to 7 with ammonium chloride, heat to 40°C, react for 2 hours, and then use 20 Adjust the pH to 3.0 with % sulfuric acid, continue to react for 0.5 hours, age for 1 hour, centrifuge and precipitate, and dry to obtain a powdery product, which is t...

Embodiment 2

[0063]Add 50g of wood pulp alkali lignin and 50g of bamboo pulp alkali lignin into water to achieve a mass percentage concentration of alkali lignin based on the total mass of the mixed alkali lignin aqueous solution to be 40%, then adjust the pH of the solution to 12, and add 50g Glycerol and 2g of aluminum oxide are heated up to 90°C, and 30g of epichlorohydrin is added dropwise, and at the same time, a potassium hydroxide solution with a concentration of 30% by mass is added dropwise to maintain the pH of the reaction solution at 12, and react for 4 hours to obtain polyhydroxy lignin lignin solution; prepare a sodium silicate aqueous solution with a mass concentration of 10%, and add the polyhydroxy lignin solution obtained above to it, mix it uniformly, adjust the pH to 9 with ammonium chloride, heat to 80° C., and react for 6 hours. Then adjust the pH to 5 with 20% nitric acid, continue to react for 2 hours, age for 3 hours, centrifuge and precipitate, and dry to obtain a ...

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Abstract

The invention discloses polyhydroxy lignin/silicon dioxide composite nano particles and a preparation method thereof. The preparation method comprises the following steps: adding industrial lignin into water, adjusting the pH value to be 8-12, adding polyhydric alcohol and a catalyst, and dropping epoxy haloalkane, thereby obtaining polyhydroxy lignin; adding water into sodium silicate to prepare a solution with the mass concentration of 1-10%, adding the prepared polyhydroxy lignin, adjusting the pH value to be 8-11 by using a weak acid adjusting agent, reacting, adjusting the pH value to be 3-5 by using a strong acid adjusting agent, reacting, aging, centrifuging, depositing, and drying, thereby obtaining a powder product, namely the polyhydroxy lignin/silicon dioxide composite nano particles. The prepared composite nano particles are low in cost, uniform in particle size, good in dispersity and greatly superior to inorganic nano particles and acid-out alkali lignin in compatibility with high molecular materials, and the mechanical property of high molecular materials such as plastic can be remarkably improved.

Description

technical field [0001] The invention relates to the technical field of nanocomposite particles, in particular to a polyhydroxy lignin / silicon dioxide composite nanoparticle and a preparation method thereof. Background technique [0002] Inorganic nanoparticles generally have the advantages of rigidity, dimensional stability, and thermal stability. High molecular polymers such as plastics and rubber have the advantages of toughness, ease of processing, and dielectric properties. However, inorganic nanoparticles have high surface energy and are easily The shortcomings of agglomeration, large polarity difference with polymer materials, difficulty in mixing, and difficulty in dispersing affect the performance of polymer materials. Coating organic polymers on the surface of inorganic nanoparticles by a certain method, changing the polarity of the surface of inorganic nanoparticles, and then compounding them with polymers can improve the phase between the surface of inorganic nano...

Claims

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Application Information

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IPC IPC(8): C08L97/00C08K3/36C08H7/00
Inventor 邱学青杨东杰熊文龙黄锦浩楼宏铭邓永红易聪华
Owner SOUTH CHINA UNIV OF TECH
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