A cellulose-based flexible heat storage composite material and its preparation method

A composite material and a flexible base technology, which is applied in the field of heat storage composite material preparation and can solve problems such as hindering application and poor degradability.

Active Publication Date: 2022-03-01
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these PCMs-encapsulated polystyrene composites are often brittle due to the brittleness of polystyrene, which may hinder their application and poor degradation

Method used

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  • A cellulose-based flexible heat storage composite material and its preparation method
  • A cellulose-based flexible heat storage composite material and its preparation method
  • A cellulose-based flexible heat storage composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This implementation provides a method for preparing a heat storage composite material, the steps are as follows:

[0038] (1): 16g wood pulp-carboxylated cellulose nano-suspension (CNF) (mass concentration is 1%) and 2g F127 and 2g deionized water are mechanically stirred until fully dissolving to obtain the water phase, and 40g octadecane is added dropwise Drop into the above water phase, and mix well to obtain an oil-in-water high internal phase emulsion;

[0039](2): Add 1.0 g of hexamethylene isocyanate as a cross-linking agent and 0.02 g of dibutyltin dilaurate as a catalyst into the oil-in-water type high internal phase emulsion, mix quickly and evenly, divide the sample into two, and one part is passed through Sample 1 was obtained after heating and drying for 24 hours, and sample 2 was obtained after another part was freeze-dried for 24 hours. The heating temperature was 100°C, and the freezing temperature was -30°C.

Embodiment 2

[0041] This implementation provides a method for preparing a heat storage composite material, the steps are as follows:

[0042] (1): 16g wood pulp-carboxylated cellulose nano-suspension (CNF) (mass concentration is 1%) and 2g sorbitan monooleate and 2g deionized water are mechanically stirred until completely dissolving to obtain the water phase, and 40g of octadecane was dropped into the above water phase drop by drop, and after mixing evenly, an oil-in-water type high internal phase emulsion was obtained;

[0043] (2): Add 1.0 g of hexamethylene isocyanate as a cross-linking agent and 0.02 g of dibutyltin dilaurate as a catalyst into the oil-in-water type high internal phase emulsion, mix quickly and evenly, divide the sample into two, and one part is passed through Sample 1 was obtained after heating and drying for 24 hours, and sample 2 was obtained after another part was freeze-dried for 24 hours. The heating temperature was 100°C, and the freezing temperature was -40°C....

Embodiment 3

[0045] This implementation provides a method for preparing a heat storage composite material, the steps are as follows:

[0046] (1): 10g cotton-sulfonated cellulose suspension (0.5% mass concentration) and 1g F127 and 1g deionized water were mechanically stirred until completely dissolved to obtain the water phase, and 40g octadecane was dropped dropwise into the above water phase After mixing evenly, an oil-in-water high internal phase emulsion is obtained;

[0047] (2): Add 1.0 g of hexamethylene isocyanate as a cross-linking agent and 0.02 g of dibutyltin dilaurate as a catalyst into the oil-in-water type high internal phase emulsion, mix quickly and evenly, divide the sample into two, and one part is passed through Sample 1 was obtained after heating and drying for 24 hours, and sample 2 was obtained after another part was freeze-dried for 24 hours. The heating temperature was 90°C, and the freezing temperature was -30°C.

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Abstract

The invention provides a cellulose-based flexible heat storage composite material and a preparation method thereof, which comprises the following steps: uniformly mixing the oil phase and the water phase to obtain an oil-in-water high internal phase emulsion, wherein the oil phase It is an organic phase change material; the water phase includes a water-soluble emulsifier, a cellulose suspension and water, and a crosslinking agent and a catalyst are added to the above-mentioned high internal phase emulsion, and the cellulose emulsion can be polymerized at the interface by heating. Form a cross-linked polymer, and then obtain a heat storage composite material after heat drying and freeze drying. The shape of this heat storage composite material can be controlled by placing a high internal phase emulsion mold during polymerization. It has a nanofiber structure inside. The heat storage density of the material after heating and drying reaches 200J / g, while the heat storage density of the material after freeze drying The density can be as high as 250J / g, it is flexible at room temperature and above 40°C, can be curled and folded, and has good thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of heat storage composite material preparation, in particular to a cellulose-based flexible heat storage composite material and a preparation method thereof. Background technique [0002] With increasing energy consumption, more efficient ways to store energy need to be developed. Phase change materials, which exhibit a large amount of latent heat during crystallization and melting, have attracted attention due to their small temperature changes and excellent energy storage and release properties. PCMs can improve the efficiency of thermal energy utilization and have been applied in energy-efficient buildings, solar energy storage, heat-regulating textiles, and electronic cooling. In order to prevent PCMs from leaking in practical applications, they are usually encapsulated and shaped. According to size, packages are usually divided into nano (<1 μm), micro (1-1000 μm), macro (>1 mm). Micro- and nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 张涛卢锦涛赵燕
Owner SUZHOU UNIV
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