A kind of reversible thermochromic cellulose nano film and preparation method thereof

A nano-film and thermochromic technology, applied in the direction of non-fibrous pulp addition, fiber raw material treatment, pulp beating/refining methods, etc., can solve problems such as differences in preparation methods, and achieve mature production processes, fast response speed, and high production efficiency high effect

Inactive Publication Date: 2021-04-23
ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the different uses of paper, there are often great differences in the selection of raw materials for the preparation of cellulose and the preparation methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The specific preparation method of the reversible thermochromic cellulose nanofilm provided in this example is described in detail as follows.

[0032] (1) Preparation of nanocellulose

[0033] 1 kg of pulp was added to 25 kg of water, soaked for 2 hours and mechanically stirred for 3 hours (stirring speed 50 rpm) to obtain a viscous primary pulp dispersion;

[0034] Set the gap between the grinding discs of the ultrafine grinder to 2 mm and the rotational speed to 1500 rpm, pour the obtained primary pulp dispersion into the hopper of the grinder, and feed twice in a cycle, and gradually reduce the gap between the grinding discs to 500 μm, 150 μm, 50 μm, 0 μm, -50 μm , feeding about 2~3 times per cycle; during the grinding process, water can be added to rinse the hopper and dilute to ensure the uniformity of grinding, and finally obtain a submicron fiber dispersion;

[0035] Add the obtained sub-micron cellulose dispersion to a high-pressure homogenizer for explosive s...

Embodiment 2

[0045] The preparation method of the reversible thermochromic cellulose nanofilm provided in this example is roughly the same as that in Example 1, and only some process parameters are adjusted as follows:

[0046]In step (2), the amount of myristyl alcohol was adjusted to 0.1 g, and the amount of crystal violet lactone and bisphenol A was adjusted to 0.01 g and 0.04 g. There is no difference in its discoloration temperature, but the color of the obtained film is lighter than that of Example 1.

[0047] With reference to the experimental method of Example 1, the heat preservation performance was tested. The results showed that it took 60 minutes to cool down to room temperature.

Embodiment 3

[0049] The preparation method of the reversible thermochromic cellulose nanofilm provided in this example is roughly the same as that in Example 1, and only some process parameters are adjusted as follows:

[0050] In step (2), the amount of myristyl alcohol was adjusted to 0.05 g, and the amount of crystal violet lactone and bisphenol A was adjusted to 0.01 g and 0.04 g. There is no difference in its discoloration temperature, but the color of the obtained film is lighter than that of Example 1, and is consistent with the color depth of Example 2.

[0051] With reference to the experimental method of Example 1, the heat preservation performance was tested. The results showed that it took 50 minutes to cool down to room temperature.

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Abstract

The application belongs to the technical field of preparation of cellulose film materials of polymer materials, and specifically relates to a patent application for a cellulose nano-film with reversible thermochromism and a preparation method thereof. The preparation of the film includes the steps of preparing nano cellulose, adding thermal insulation material, CVL and BPA to prepare thermochromic cellulose nano film and the like. The reversible thermochromic cellulose nano film can slow down heat dissipation and has a certain heat preservation effect. This application prepares a thermochromic functional cellulose nano-film by compounding thermochromic compound and cellulose. The cellulose nano-film has the characteristics of instant discoloration with temperature change, and has fast response speed and stability. It has good advantages, especially its reversible characteristic, which makes it reusable, and with this reversible temperature characteristic, it can be better used to indicate and monitor related temperature changes. In general, the present invention provides a new idea for preparing cellulose nanofilms.

Description

technical field [0001] The application belongs to the technical field of preparation of cellulose film materials of polymer materials, and specifically relates to a patent application for a cellulose nano-film with reversible thermochromism and a preparation method thereof. Background technique [0002] Cellulose is the most widely distributed and abundant polysaccharide on the earth, and it is also a natural polymer material, accounting for more than 50% of the carbon content in the plant kingdom. Among them, nanocellulose refers to cellulose with a fibril diameter of 1-100nm, and according to different raw materials and manufacturing processes, it can be subdivided into nanocrystalline cellulose, nanofiber cellulose, bacterial nanocellulose, etc. Since the size of cellulose reaches the nanoscale, its structure and properties have changed greatly, and it has many unique properties, such as low thermal expansion coefficient, high specific surface area, good mechanical proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21D1/30D21H17/06D21H17/14D21H21/14D21J3/12
CPCD21D1/30D21H17/06D21H17/14D21H21/14D21H27/00D21J3/12
Inventor 任素霞董莉莉张修强雷廷宙吴清林何晓峰徐海燕
Owner ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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