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Preparation method of hydrophobic nanocellulose material

A nanocellulose and hydrophobic nanotechnology, applied in the field of preparation of hydrophobic nanocellulose, can solve the problems of hydrophobic coating damage, low durability, low melting point, etc. good biocompatibility

Inactive Publication Date: 2021-06-04
湖州闪思新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkylamine is very smooth when coated on the surface of the material, mainly relying on chemical groups to hydrophobic, the hydrophobic effect is poor, and it is easy to wear and has low durability
Moreover, the melting point of alkylamine is low. When the ambient temperature is higher than the melting point of alkylamine, the alkylamine will melt and the hydrophobic coating will be destroyed.

Method used

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  • Preparation method of hydrophobic nanocellulose material
  • Preparation method of hydrophobic nanocellulose material
  • Preparation method of hydrophobic nanocellulose material

Examples

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Effect test

preparation example Construction

[0044] A method for preparing hydrophobic nanocellulose, comprising the following steps:

[0045] S1 Add cellulose to concentrated sulfuric acid and heat to 50°C-70°C to stir for hydrolysis, add 10 times the volume of acid deionized water to terminate the reaction, centrifuge the suspension and remove the supernatant, and then centrifuge the lower layer for several times Washing, dialysis with water for 5-10 days after ultrasonication, ultrasonic treatment again to obtain a nanocellulose dispersion, and placing the nanocellulose dispersion in the refrigerated layer of the refrigerator for later use; the cellulose can be pulp cellulose, microcrystalline cellulose and bacterial One or several kinds of cellulose, the dosage ratio of cellulose and sulfuric acid is (15-30) g: (150-300) mL;

[0046] S2 Dilute the nanocellulose dispersion obtained in step S1 with deionized water to a mass concentration of 0.2%-4%, perform ultrasonic treatment on the diluted nanocellulose dispersion f...

Embodiment 1

[0062] Add cellulose to concentrated sulfuric acid, heat and stir for acidolysis, add 10 times the volume of acid deionized water to terminate the reaction, centrifuge the suspension and remove the supernatant, then wash the lower layer of sediment several times by centrifugation, and perform dialysis after ultrasonication Several days, and finally sonicated again to obtain nanocellulose dispersion. Dilute the nanocellulose dispersion obtained in the above steps to a mass concentration of 2%. The nanocellulose dispersion was adjusted to pH 8.5 with 0.01% sodium hydroxide solution, and tris was added to keep the pH constant. According to the nanocellulose / tannic acid mass ratio of 5:1, tannic acid was added to the nanocellulose dispersion, and stirred and reacted for 24 hours in an atmospheric environment. Prepare an octadecylamine ethanol solution with the same volume and mass percentage as the nanocellulose, mix it with the nanocellulose dispersion, stir and react under atmo...

Embodiment 2

[0064] The type, amount and process flow of the materials used are the same as in Example 1, except that octadecylamine is replaced with tetradecylamine to obtain tetradecylamine-polytannic acid-nanocellulose.

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Abstract

The invention belongs to the field of preparation of hydrophobic materials, and particularly relates to a preparation method of hydrophobic nanocellulose. According to the preparation method of the hydrophobic nanocellulose, tannic acid or dopamine with good biocompatibility is used as a cross-linking agent, alkylamine is grafted to the surface of the nanocellulose through covalent bonds, an alkylamine-nanocellulose hydrophobic material is used as a hydrophobic coating, and after the hydrophobic coating is sprayed on the surface of a base material, on one hand, the chemical hydrophobic capacity of alkylamine is reserved, on the other hand, a coarse micro-nano structure is formed on the surface of the material in cooperation with nanocellulose, the good hydrophobic effect is achieved, the hydrophobic performance and durability are obviously improved, and the super-hydrophobic effect of the material can be achieved.

Description

technical field [0001] The invention belongs to the field of preparation of hydrophobic materials, and in particular relates to a preparation method of hydrophobic nano cellulose. Background technique [0002] Hydrophobic materials are used in various fields of society, from food packaging to clothing, even self-cleaning surfaces or oil-water separation materials, etc., are inseparable from the role of hydrophobic materials, it can be said that hydrophobic materials are reflected in all aspects of life, and the application is very widely. [0003] Hydrophobic treatment of materials can be achieved mainly through physical and chemical methods. Physical treatment of hydrophobicity is to prepare a rough surface with micro-nano structure, and achieve hydrophobicity through physical mechanics. Chemical treatment Hydrophobic modification is to add low surface energy substances to materials, such as substances containing long alkyl chains or fluorine-containing substances, so as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/06C08B15/02C09D101/08
CPCC08B15/06C08B15/02C09D101/08
Inventor 张振项浩晟常天张哲王娟史少伟刘大鹏杜小英张旭张颜
Owner 湖州闪思新材料科技有限公司
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