Preparation method of nanocellulose/polyurethane foam composite elastomer

A technology of polyurethane foam and nanocellulose, which is applied in the field of preparation of cellulose composite materials, can solve the problems of inability to rebound, poor elastic properties of cellulose foam/aerogel, etc., achieve good cushioning function, stable performance, and simple process Effect

Inactive Publication Date: 2015-05-06
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that cellulose foam / aerogel has poor elastic properties and cannot rebound after being compressed, and provides a preparation method of nano-cellulose / polyurethane foam composite elastomer

Method used

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  • Preparation method of nanocellulose/polyurethane foam composite elastomer
  • Preparation method of nanocellulose/polyurethane foam composite elastomer

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specific Embodiment approach 1

[0021] Specific embodiment 1: The method for preparing a nano-cellulose / polyurethane foam composite elastomer of this embodiment is specifically carried out according to the following steps:

[0022] 1. The cellulose resource is made into powder, subjected to Soxhlet extraction, and then added to distilled water and mixed uniformly to obtain a solid-liquid mixture;

[0023] 2. Add the solid-liquid mixture obtained in step 1 to the acidified sodium chlorite solution, and control the temperature to be 50-100°C under a constant temperature water bath for 0.5-2h to obtain a mixture;

[0024] 3. Repeat step 2 2-10 times, and then clean;

[0025] 4. Add the mixture obtained in step 3 to the alkaline solution, let it stand for 8-12 hours, then control the temperature to 70-100°C, keep it for 1-5 hours, then wash and drain, and then perform cleaning and suction filtration to obtain purified cellulose ;

[0026] 5. The purified cellulose obtained in step 4 is subjected to mechanical defibrillat...

specific Embodiment approach 2

[0029] Specific embodiment two: This embodiment is different from specific embodiment one in that the cellulose resource in step one is lignocellulose resource. Others are the same as the first embodiment.

[0030] Lignocellulosic resources include wood, bamboo, cotton, hemp and agricultural and forestry management residues, as well as biological materials containing cellulose such as bacterial cellulose and ascidians.

specific Embodiment approach 3

[0031] Specific embodiment three: This embodiment is different from the specific embodiment one in that the extraction temperature is controlled to 90°C in step one. Others are the same as the first embodiment.

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Abstract

The invention relates to a preparation method of a nanocellulose/polyurethane foam composite elastomer, relating to a preparation method of a cellulose composite material and aiming at solving the problems that a cellulose foam/aerogel is poor in elastic property and can not rebound after being compressed. The preparation method comprises the following steps: 1, preparing powder, carrying out extraction treatment, and adding distilled water; 2-3, removing lignin; 4, removing hemicellulose; 5, carrying out mechanical fiber separating treatment; and 6-7, immersing nanocellulose into a polyurethane foam, and then carrying out drying treatment. The nanocellulose/polyurethane foam composite elastomer prepared through the method disclosed by the invention not only has high adsorption of the nanocellulose, but also reserves good elastic property of the polyurethane foam, and can be widely applied to the fields of a nanoparticle template material, an oil-water separating material, a conductive composite material and a filter material.

Description

Technical field [0001] The invention relates to a preparation method of a cellulose composite material. Background technique [0002] As a natural organic polymer material, nanocellulose contains a large number of hydroxyl groups on the surface, which provides sites for the binding of nanoparticles, etc., has strong adsorption, and has high Young's modulus, high strength, The advantages of high specific surface area, ultra-fine structure, and low thermal expansion coefficient have great application prospects in polymer nanocomposites, flexible optoelectronic devices, food packaging and other fields. In recent years, the technology for preparing lightweight, porous, flexible foam / aerogel and other materials using nanocellulose as the basic building block has attracted increasing attention. However, due to the large number of hydroxyl groups on the surface of nanocellulose, the nanocellulose foam / aerogel is not elastic and cannot rebound after being squeezed, which limits the appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L1/02C08J9/28
Inventor 陈文帅赵苑竹于海鹏全志超张奇严悦张亚男刘一星
Owner NORTHEAST FORESTRY UNIVERSITY
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