1. The flexible phase change cold storage material is characterized by at least comprising sodium polyacrylate, dihydroxyaluminum glycolate, tartaric acid, alcohol, water and sodium carboxymethylcellulose, wherein the raw materials account for the total weight of the raw materials in percentage by mass: 5 to 10 percent of sodium polyacrylate, preferably 8 percent of sodium polyacrylate, 0.1 to 1 percent of dihydroxyaluminium glycolate, preferably 0.5 percent of dihydroxyaluminium glycolate, 0.1 to 1 percent of tartaric acid, preferably 0.5 percent of tartaric acid, 1 to 5 percent of alcohol, preferably 3 percent of ethanol, 5 to 10 percent of sodium carboxymethylcellulose, preferably 8 percent of sodium carboxymethylcellulose, and the balance of water.

2. The flexible phase change cold storage material of claim 1, wherein:

the molecular weight range of the sodium polyacrylate is 500-1000000, preferably 700.

3. The flexible phase change cold storage material of claim 1, wherein:

the phase change enthalpy of the flexible phase change cold storage material is 200-280 kJ/kg.

4. A method for preparing a flexible phase change cold storage material according to claim 1, 2 or 3, which comprises the following steps:

s1, grinding at least five raw materials of sodium polyacrylate, dihydroxyaluminum glycolate, tartaric acid, alcohol and sodium carboxymethylcellulose uniformly according to the component proportion to form a mixture;

s2, heating the mixture prepared in the step S1 and water according to the mass ratio, uniformly stirring the mixture to form a colloidal mixture;

and S3, taking out the colloidal mixture, packaging, and freezing to obtain the flexible phase change cold storage material.

5. The method according to claim 4, wherein the raw material grinding in step S1 is performed at normal temperature.

6. The preparation method according to claim 4, wherein the heating temperature in the step S2 is 30-50 ℃, and the stirring time is 1-2 h.

7. The method as claimed in claim 4, wherein in step S3, the product is frozen at-10 to-20 ℃ for 4 to 6 hours to obtain the flexible phase change cold storage material.

8. The method as claimed in claim 4, wherein the phase change enthalpy of the flexible phase change cool storage material in the step S3 is 200-280 kJ/kg.

9. Use of a flexible phase change cold storage material according to claim 1, 2 or 3, wherein: the product can be used as a phase change cold storage material.

Background

With the continuous development of human socioeconomic and large energy consumption, energy conservation and environmental protection become global topics of attention. The development and utilization of new energy and the improvement of energy efficiency have become key points of research and development in various countries. The phase-change material is utilized to balance the energy supply and demand, so that the energy efficiency can be effectively improved, and the aims of energy conservation and environmental protection are fulfilled. It has wide application prospect in the fields of energy, spaceflight, construction, agriculture, chemical industry and the like. Has become a worldwide research hotspot.

The phase-change material can absorb or release a large amount of latent heat in the phase-change process, and has the advantages of high heat storage density, small volume, constant temperature control, obvious energy-saving effect, wide phase-change temperature selection range, easiness in control and the like, so that the phase-change material is widely applied to the field of energy storage and temperature control.

Meanwhile, the phase change cold storage material is one of phase change energy storage materials. However, most of the phase-change cold storage materials attached to human bodies in the market are too hard after being frozen, and the flexibility and the comfort of users are seriously influenced.

Disclosure of Invention

The invention aims to provide a flexible phase change cold storage material and a preparation method thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a flexible phase change cold storage material at least comprises sodium polyacrylate, dihydroxyaluminum glycolate, tartaric acid, alcohol, water and sodium carboxymethylcellulose, wherein the raw materials account for the following mass percentages: 5 to 10 percent of sodium polyacrylate, 0.1 to 1 percent of dihydroxyaluminum glycolate, 0.1 to 1 percent of tartaric acid, 1 to 5 percent of alcohol, 5 to 10 percent of sodium carboxymethylcellulose, and the balance of water.

A preparation method of a flexible phase change cold storage material comprises the following specific preparation steps:

s1, grinding at least four raw materials of sodium polyacrylate, dihydroxyaluminum glycolate, tartaric acid, alcohol and sodium carboxymethylcellulose uniformly according to the component proportion to form a mixture;

s2, putting the mixture prepared in the step S1 and water into an oil bath pan according to the mass ratio, heating, uniformly stirring the mixture to form a colloidal mixture;

and S3, taking out the colloidal mixture, carrying out vacuum plastic package, and freezing the colloidal mixture to obtain the flexible phase change cold storage material.

Further, the molecular weight of sodium polyacrylate in the raw material is 500-1000000.

Further, the raw material grinding in the step S1 is performed at a normal temperature.

Further, the heating temperature of the oil bath kettle in the step S2 is 30-50 ℃, and the stirring time is 1-2 h.

Further, in the step S3, the product is frozen in an environment of-20 ℃ for 4-6 hours to obtain the flexible phase change cold storage material.

Further, the phase change enthalpy of the flexible phase change cold storage material in the step S3 is 200-280 kJ/kg.

Furthermore, the product can be used as a phase change cold storage material, and can be matched with clothes due to the flexibility of the product after being frozen, is applied to the aspect of human body temperature reduction, and has comfortableness

The formed phase change cold storage material has the advantages of flexibility, large phase change enthalpy, high stability, simple preparation process, convenience in packaging and production, improvement of production efficiency, and reduction of cost and time loss.

Compared with the prior art, the invention has the characteristics of low requirements on process conditions, simple component proportion, easy operation of the preparation method, high phase-change latent heat value and the like. In addition, the fabric still has flexibility after being frozen, so that the flexibility of a user can be greatly improved by matching with the clothes, and the comfort is enhanced.

Drawings

Fig. 1 is a differential scanning calorimetry curve of the flexible phase-change cold storage material.

Fig. 2 is a differential scanning calorimetry curve of the flexible phase-change cold storage material.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

In the embodiment of the invention, the flexible phase change cold storage material at least comprises sodium polyacrylate, dihydroxyaluminium glycolate, tartaric acid, alcohol, water and sodium carboxymethylcellulose, wherein the mass percentages of the raw materials in the total amount of the raw materials are as follows: 5 to 10 percent of sodium polyacrylate, 0.1 to 1 percent of dihydroxyaluminium aminoacetate, 0.1 to 1 percent of tartaric acid, 1 to 5 percent of alcohol, 5 to 10 percent of sodium carboxymethylcellulose (limited by Shanghai Aladdin Biotechnology), and the balance of water.

Example 1

A preparation method of a flexible phase change cold storage material comprises the following specific preparation steps:

s1, grinding five raw materials, namely sodium polyacrylate 500, dihydroxyaluminum glycinate, tartaric acid, alcohol and sodium carboxymethylcellulose uniformly according to the mass ratio of the raw materials to the components of 8.5:1:1:3.5:8 to form a mixture;

s2, putting the mixture prepared in the step S1 and water into an oil bath pan according to the mass ratio of 11:39, heating at 40 ℃, uniformly stirring for 1.5h, and uniformly stirring to form a colloidal mixture;

and S3, taking out the colloidal mixture, carrying out vacuum plastic package, and freezing the colloidal mixture at-20 ℃ for 4 hours to prepare the flexible phase change cold storage material.

The prepared flexible phase change cold storage material has low requirements on related process conditions, simple component proportion and easy operation of the preparation method, the differential scanning calorimetry curve is shown in figure 1, the fitted phase change enthalpy value is 251J/g, the average phase change enthalpy value of products on the market is 180J/g, and the result shows that the flexible phase change cold storage material has high phase change latent heat value compared with most products on the market.

Example 2

A preparation method of a flexible phase change cold storage material comprises the following specific preparation steps:

s1, grinding the four raw materials of sodium polyacrylate 800, dihydroxyaluminum glycolate, tartaric acid, alcohol and sodium carboxymethylcellulose uniformly according to the component ratio of 8.5:0.5:0.5:3.5:8 to form a mixture;

s2, putting the mixture prepared in the step S1 and water into an oil bath kettle according to the mass ratio of 21:79, heating at 35 ℃, uniformly stirring for 2 hours to form a colloidal mixture;

and S3, taking out the colloidal mixture, carrying out vacuum plastic package, and freezing the colloidal mixture at-20 ℃ for 5 hours to prepare the flexible phase change cold storage material.

The prepared flexible phase change cold storage material has low requirements on related process conditions, simple component proportion and easy operation of the preparation method, the differential scanning calorimetry curve is shown in figure 2, the fitted phase change enthalpy value is 212J/g, the average phase change enthalpy value of products on the market is 180J/g, and the result shows that the flexible phase change cold storage material has high phase change latent heat value compared with most products on the market.

Example 3

A preparation method of a flexible phase change cold storage material comprises the following specific preparation steps:

s1, grinding the four raw materials of sodium polyacrylate 800, dihydroxyaluminum glycolate, tartaric acid, alcohol and sodium carboxymethylcellulose uniformly according to the component ratio of 8:0.3:0.7:3:8 to form a mixture;

s2, putting the mixture prepared in the step S1 and water into an oil bath pan according to the mass ratio of 1:4, heating at 35 ℃, uniformly stirring for 2 hours to form a colloidal mixture;

and S3, taking out the colloidal mixture, carrying out vacuum plastic package, and freezing the colloidal mixture at-20 ℃ for 5 hours to prepare the flexible phase change cold storage material.

The prepared flexible phase change cold storage material has low requirements on related process conditions, simple component proportion, easy operation of the preparation method, semitransparent colloidal liquid at normal temperature, no fluidity, stretchability and good elasticity. It is still colloidal liquid after freezing, has no fluidity, and has increased elasticity. The phase change material is made into a phase change material sheet with the thickness of 20cm multiplied by 10cm multiplied by 1cm, and the phase change material sheet can still be randomly bent by 180 degrees and can be restored to the original shape after being frozen for 5 hours at the temperature of minus 20 ℃. Compared with the phase change cooling materials on the market, the phase change cooling materials can not be stretched and bent after being frozen and have no defect of plasticity, and the phase change cooling materials still have flexibility after being frozen, so that the flexibility of a user can be greatly improved and the comfort is enhanced by matching with clothes.