CN1212364C - material for storing heat and supplying heat for building generated shaped phase change by heating and its preparation method - Google Patents

Abstract

A heating-setting phase-change thermal storage material for building heating and a preparation method thereof belong to the technical field of phase-change materials for building. The electric heating shape-setting phase change heat storage material for building heating is characterized in that it is composed of paraffin wax with 18-23 carbons, polyolefin, thermoplastic elastomer and inorganic filler; its phase change temperature is between 30°C and 40°C During the period, the room temperature can be kept at about 18°C to 26°C. The solar heating and shape-setting phase-change heat storage material for building heating is characterized in that it is composed of paraffin wax with a carbon number of 16-20, polyolefin, thermoplastic elastomer and inorganic filler; its phase transition temperature is between 17°C and 25°C During the period, the room temperature can be kept at about 20°C. The invention also proposes the preparation method of these two materials. The shape of these two materials does not change before and after the phase change, the paraffin does not leak, it is non-toxic and harmless, it does not need to be packaged, and can be used directly, which is very suitable for building heating.

Description

Heating shape-setting phase-change thermal storage material for building heating and preparation method thereof

Technical field:

A heating-setting phase-change thermal storage material for building heating and a preparation method thereof belong to the technical field of phase-change materials for building.

Background technique:

At present, building heating is mainly based on coal, which not only has low heat utilization efficiency, but also causes serious air pollution. Therefore, natural gas heating and electric heating are gradually replacing coal-fired heating. Natural gas heating is convenient, but expensive. Electric heating (such as electric heating) has caused serious peak and valley phenomena in electricity consumption due to the concentrated use time of users. The power supply is tight during the peak period of electricity consumption, and a large number of power resources are idle during the low period of electricity consumption. For this reason, many large and medium-sized cities are gradually implementing the principle of separate pricing for power grid peaks and valleys, and the electricity charges during the off-peak period are much lower than the peak period. In the past, heat storage materials used for building heating were mostly crystalline hydrated salts, which needed to be packaged when used, and were prone to leakage. Moreover, after several phase change cycles, the phase change heat of these crystalline hydrated salts will decrease, which will affect the heat storage capacity. The research on shape-setting phase change materials was carried out earlier in Japan. Professor Inaba et al. (Heat and Mass Transfer, 32(1997), p307) of Okayama University in Japan studied the shape-setting phase change materials composed of paraffin wax and high-density polyethylene. Wherein the paraffin content is 74wt%, the melting point is 54°C, and the phase transition enthalpy is 121.4kJ/kg. France's Xavier Py et al. (International Journal of Heat and Mass Transfer, 44 (2001), p2727) used expanded graphite as a support material to prepare a paraffin-expanded graphite shape-fixed phase change material with high thermal conductivity, and studied the thermal conductivity of the system. physical properties. The melting points of the paraffins they used were 70-80°C, 18.1°C and -9°C, respectively, and the content was 65-95wt%. The results of the phase change enthalpy were not reported. Ye Hong and Ge Xinshi of the University of Science and Technology of China (Solar Materials and Solar Cells, 64 (2000), p37) investigated the shape-setting phase change materials formed by high-density polyethylene with different melt indices and paraffin, and screened high-density polyethylene. Xiao Min and Gong Kecheng of South China University of Technology (Acta Solar Energy Sinica, 22 (2001), p247) prepared a paraffin-SBS (styrene-butadiene-styrene triblock copolymer) shape-fixed phase change material, and the content of paraffin was 20-80wt%, melting point 56-58°C, phase change enthalpy up to 165.2kJ/kg. The specific method is to slowly add paraffin wax into SBS at 100°C on a double-roller heat refining machine, and mix and heat it. In order to improve the thermal conductivity of the material, a small amount of processed expanded graphite is also added. The shape-setting phase-change materials reported in the prior art do not have the temperature range required by this patent. Therefore, due to the high phase-change temperature, they are not suitable for building electricity and solar heating. Secondly, the paraffin wax will ooze out to varying degrees after the material is heated. And the preparation method of the material cannot be used for mass production.

Invention content:

The purpose of the present invention is to propose an organic or organic/inorganic composite shape-setting phase change material that is composited with phase change heat storage materials, polymer materials or phase change heat storage materials, polymer materials, and inorganic fillers. It is used for electric heating and setting phase change heat storage materials and solar heating setting phase change heat storage materials for building heating. The phase change temperatures of these two materials are between 30°C-40°C and 17°C-25°C respectively. The shape does not change before and after the transformation, the paraffin does not leak, it is non-toxic and harmless, and can be used directly without packaging. It is very suitable for building heating and has broad application prospects in other aspects. Aiming at the proposed shape-fixed phase change material, the present invention also proposes its preparation method.

The electric heating shape-setting phase-change thermal storage material for building heating proposed by the present invention is characterized in that it contains: paraffin wax with a carbon number of 18-23, thermoplastic elastomer and inorganic filler, and the content ratio is:

Paraffin wax with a carbon number of 18-23: 60wt%-80wt%;

Thermoplastic elastomer: 15wt%-30wt%;

Inorganic filler: 5%-10wt%.

The inorganic filler is calcium carbonate.

The above-mentioned preparation method of the electric heating shape-setting phase-change thermal storage material for building heating is characterized in that it comprises 60wt%-80wt% of paraffin wax with a carbon number of 18-23, thermoplastic elastomer: 15wt%-30wt%, inorganic filler 5%-10wt% is processed according to the following steps:

1) Organic hydrothermal treatment of inorganic fillers:

Disperse the inorganic filler in the aqueous solution of the coupling agent, perform ultrasonic dispersion and then dry;

2) After mixing the above-mentioned organically treated inorganic filler with paraffin wax with a carbon number of 18-23 and a thermoplastic elastomer, mix it in an ultra-high-speed pulverizer at high speed, and then take it out and place it;

3) The above-mentioned mixture is blended and extruded at 130°C-150°C, and molded in a mold;

4) A layer of polyethylene composite film is coated on the surface of the molded material, and the film is closely attached to the molding material. The coupling agent is one or more of stearic acid, calcium stearate and sodium stearate.

The electric heating shape-setting phase-change heat storage material for building heating is characterized in that it contains:

Paraffin wax with a carbon number of 18-23, thermoplastic elastomer and inorganic filler, the content ratio is:

Paraffin wax with carbon number of 18-23: 60wt%;

Polyolefin: 30wt%;

Thermoplastic elastomer: 5wt%;

Inorganic filler: 5%wt%.

The inorganic filler is calcium carbonate. The polyolefin is one or more of high-density polyethylene, low-density polyethylene, linear low-density polyethylene or polypropylene.

The above-mentioned preparation method of electric heating and setting phase-change heat storage material for building heating is characterized in that it comprises 60wt% of paraffin wax with a carbon number of 18-23, 30wt% of polyolefin, 5wt% of thermoplastic elastomer, and 5% of inorganic filler wt% is processed according to the following steps:

1) Organic hydrothermal treatment of inorganic fillers:

Disperse the inorganic filler in the aqueous solution of the coupling agent, perform ultrasonic dispersion and then dry;

2) After mixing the above-mentioned organically treated inorganic filler with paraffin wax, polyolefin and thermoplastic elastomer with a carbon number of 18-23, mix it in an ultra-high-speed pulverizer at high speed, and then take it out and place it;

3) The above mixture is blended and extruded at 130°C-150°C, and molded in a mold;

4) A layer of polyethylene composite film is coated on the surface of the molded material, and the film is closely attached to the molding material.

The coupling agent is one or more of stearic acid, calcium stearate and sodium stearate.

The solar heating fixed phase change heat storage material for building heating is characterized in that it contains:

Paraffin wax with a carbon number of 16-20, thermoplastic elastomer and inorganic filler, the content ratio is:

Paraffin wax with a carbon number of 16-20: 60wt%-80wt%;

Thermoplastic elastomer: 15wt%-30wt%;

Inorganic filler: 5%-10wt%.

The inorganic filler is calcium carbonate.

The method for preparing the above-mentioned solar heating and setting phase-change heat storage material for building heating is characterized in that it comprises 60wt%-80wt% of paraffin wax with a carbon number of 16-20, 15wt%-30wt% of a thermoplastic elastomer, and 5 wt% of an inorganic filler. %-10wt% is processed according to the following steps:

1) Organic hydrothermal treatment of inorganic fillers:

Disperse the inorganic filler in the aqueous solution of the coupling agent, perform ultrasonic dispersion and then dry;

2) After mixing the above-mentioned organically treated inorganic filler with paraffin wax and thermoplastic elastomer with a carbon number of 16-20, mix it in an ultra-high-speed pulverizer at a high speed, and then take it out and place it;

3) The above mixture is blended and extruded at 130°C-150°C, and molded in a mold;

4) A layer of polyethylene composite film is coated on the surface of the molded material, and the film is closely attached to the molding material. The coupling agent is one or more of stearic acid, calcium stearate and sodium stearate.

The solar heating fixed phase change heat storage material for building heating is characterized in that it contains:

Paraffin wax with a carbon number of 16-20, thermoplastic elastomer and inorganic filler, the content ratio is:

Paraffin wax with carbon number 16-20: 60wt%;

Polyolefin: 30wt%;

Thermoplastic elastomer: 5wt%;

Inorganic filler: 5%wt%.

The inorganic filler is calcium carbonate. The polyolefin is one or more of high-density polyethylene, low-density polyethylene, linear low-density polyethylene or polypropylene.

The method for preparing the above-mentioned solar heating and setting phase-change heat storage material for building heating is characterized in that it comprises 60 wt% of paraffin wax with a carbon number of 16-20, 30 wt% of polyolefin, 5 wt% of thermoplastic elastomer, and 5 wt% of inorganic fillers. %wt%; proceed as follows:

1) Organic hydrothermal treatment of inorganic fillers:

Disperse the inorganic filler in the aqueous solution of the coupling agent, perform ultrasonic dispersion and then dry;

2) After mixing the organically treated inorganic filler with paraffin wax, polyolefin and thermoplastic elastomer with a carbon number of 16-20, mix it in an ultra-high-speed pulverizer at high speed, and then take it out and place it;

3) blending and extruding the above-mentioned mixture at 130°C-150°C, and molding it in a mould;

4) A layer of polyethylene composite film is coated on the surface of the molded material, and the film is closely attached to the molding material. The coupling agent is one or more of stearic acid, calcium stearate and sodium stearate.

Experiments have proved that the phase change temperature of the electric heating shape-setting phase change material used in building heating proposed by the present invention is between 30-40°C, and the phase change temperature of the solar heating shape-setting phase change material used in building heating is between 17-25°C. Between the two materials, the shape of the two materials does not change before and after the phase transition, and the paraffin does not leak, which is non-toxic and harmless. It is suitable for building heating and achieves the expected purpose. The preparation method can prepare the proposed two kinds of shape-fixed phase change thermal storage materials.

Detailed ways:

1. The setting phase containing paraffin wax (60wt%-80wt%), polyolefin (0-30wt%), thermoplastic elastomer (5wt%-30wt%) and inorganic filler (0-10wt%) containing carbon number 18-23 The preparation method of variable heat storage material:

Example 1

1. Add 5 grams of calcium carbonate to 10 milliliters of 10% sodium stearate aqueous solution, ultrasonically disperse for 30 minutes, dry and grind at 80° C. to obtain activated calcium carbonate powder.

2. get 5 grams of the calcium carbonate powder of gained in 1, be 18-23 paraffin, 30 gram low-density polyethylenes, 5 gram styrene-butadiene-styrene copolymers (SBS) mix with 60 gram carbon number, Put it into an ultra-high-speed pulverizer and mix at high speed for 5 minutes, take out the mixture, and let it stand for 24 hours.

3. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 130°C.

4. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

5. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required electric heating and shape-changing heat storage floor can be obtained. The melting curve peak temperature of the material measured by DSC (differential scanning calorimeter) is 34.6° C., and the heat of phase change is 112.4 kJ/kg.

Example 2

1. Add 5 grams of calcium carbonate to 10 milliliters of 10% sodium stearate aqueous solution, ultrasonically disperse for 30 minutes, dry and grind at 80° C. to obtain activated calcium carbonate powder.

2. Take 5 grams of the calcium carbonate powder obtained in 1, mix it with 80 grams of paraffin wax with a carbon number of 18-23, and 15 grams of SBS, put it into an ultra-high-speed pulverizer and mix it at high speed for 5 minutes, take out the mixture, and let it stand for 24 hours.

3. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 130°C.

4. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

5. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required electric heating and shape-changing heat storage floor can be obtained. The melting curve peak temperature of the material measured by DSC (differential scanning calorimeter) is 35.4° C., and the heat of phase change is 143.3 kJ/kg.

Example 3

1. Mix 60 grams of paraffin wax with a carbon number of 18-23, 25 grams of high-density polyethylene, a mixture of linear low-density polyethylene and polypropylene, and a mixture of 15 grams of SBS and hydrogenated SBS, and put it into an ultra-high-speed pulverizer at high speed Mix for 5 minutes, remove the mixture and let it sit for 24 hours.

2. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 150°C.

3. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

4. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required electric heating and shape-changing heat storage floor can be obtained. The melting curve peak temperature of the material measured by DSC (differential scanning calorimeter) is 35.2° C., and the heat of phase change is 114.6 kJ/kg.

Example 4

1. Add 10 grams of calcium carbonate to 20 milliliters of 10% stearic acid aqueous solution, ultrasonically disperse for 30 minutes, dry and grind at 80° C. to obtain activated calcium carbonate powder.

2. Take 10 grams of the calcium carbonate powder obtained in 1, mix it with 60 grams of paraffin wax with a carbon number of 18-23, and 30 grams of SBS, put it into an ultra-high-speed pulverizer and mix it at high speed for 5 minutes, take out the mixture, and let it stand for 24 hours.

3. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 130°C.

4. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

5. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required electric heating and shape-changing heat storage floor can be obtained. The melting curve peak temperature of the material measured by DSC (differential scanning calorimeter) is 35.3° C., and the heat of phase change is 108.2 kJ/kg.

2. The setting phase containing paraffin wax (60wt%-80wt%), polyolefin (0-30wt%), thermoplastic elastomer (5wt%-30wt%) and inorganic filler (0-10wt%) containing carbon number 16-20 The preparation method of variable heat storage material:

Example 5

1. Add 5 grams of calcium carbonate to 10 milliliters of 10% sodium stearate aqueous solution, ultrasonically disperse for 30 minutes, dry and grind at 80° C. to obtain activated calcium carbonate powder.

2. Take 5 grams of the calcium carbonate powder obtained in 1, mix it with 60 grams of paraffin wax with a carbon number of 16-20, 30 grams of low-density polyethylene, and 5 grams of SBS, put it into an ultra-high-speed pulverizer and mix it at high speed for 5 minutes, and take it out The mixture was left for 24 hours.

3. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 130°C.

4. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

5. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required solar heating and fixed phase change heat storage floor is obtained. The peak temperature of the melting curve of the material measured by DSC is 20.53°C, and the heat of phase change is 112.5kJ/kg.

Example 6

1. Add 5 grams of calcium carbonate to 10 milliliters of 10% sodium stearate aqueous solution, ultrasonically disperse for 30 minutes, dry and grind at 80° C. to obtain activated calcium carbonate powder.

2. Take 5 grams of the calcium carbonate powder obtained in 1, mix it with 80 grams of paraffin wax with a carbon number of 16-20, and 15 grams of SBS, put it into an ultra-high-speed pulverizer and mix it at high speed for 5 minutes, take out the mixture, and let it stand for 24 hours.

3. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 130°C.

4. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

5. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required solar heating and fixed phase change heat storage floor is obtained. The peak temperature of the melting curve of the material measured by DSC (differential scanning calorimetry) is 20.89° C., and the heat of phase change is 131.7 kJ/kg.

Example 7

1. Mix 60 grams of paraffin wax with a carbon number of 16-20, 25 grams of high-density polyethylene, a mixture of linear low-density polyethylene and polypropylene, and 15 grams of a mixture of SBS and hydrogenated SBS, and put it into an ultra-high-speed pulverizer at high speed Mix for 5 minutes, remove the mixture and let it sit for 24 hours.

2. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 150°C.

3. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

4. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required solar heating and fixed phase change heat storage floor is obtained. The melting curve peak temperature of the material measured by DSC (differential scanning calorimeter) is 21.7° C., and the heat of phase change is 127.4 kJ/kg.

Example 8

1. Add 10 grams of calcium carbonate to 20 milliliters of 10% stearic acid aqueous solution, ultrasonically disperse for 30 minutes, dry and grind at 80° C. to obtain activated calcium carbonate powder.

2. Take 10 grams of the calcium carbonate powder obtained in 1, mix it with 60 grams of paraffin wax with a carbon number of 16-20, and 30 grams of SBS, put it into an ultra-high-speed pulverizer and mix it at high speed for 5 minutes, take out the mixture, and let it stand for 24 hours.

3. Put the obtained mixture into a screw extruder for extrusion, and the extrusion temperature is 130°C.

4. Put the melt obtained in 3 into the mold, and use a flat press to press at 130°C for molding.

5. Coat the plate obtained in 4 with a layer of polyethylene composite film, put it into the mold again, and take it out after hot-pressing and sealing with a flat press. In this way, the required solar heating and fixed phase change heat storage floor is obtained. The melting curve peak temperature of the material measured by DSC (differential scanning calorimeter) is 20.2° C., and the heat of phase change is 105.2 kJ/kg.

The paraffin phase change material with a carbon number of 18-23 proposed by the present invention has a phase change temperature between 30°C and 40°C and can keep the room temperature at around 18°C to 26°C, and is suitable for electric heating buildings For heating; the paraffin phase-change material with a carbon number of 16-20 has a phase change temperature between 17°C and 25°C, and can keep the room temperature at about 20°C. It is suitable for heating buildings with solar energy.

Claims (18)

1, the electrically heated fixed phase change heat-storing material used of building and heating is characterized in that it contains:

Carbon number is paraffin, thermoplastic elastomer and the mineral filler of 18-23, and the content ratio is:

Carbon number is the paraffin of 18-23: 60wt%-80wt%;

Thermoplastic elastomer: 15wt%-30wt%;

Mineral filler: 5%-10wt%.

2, the electrically heated fixed phase change heat-storing material used of building and heating as claimed in claim 1 is characterized in that described mineral filler is a lime carbonate.

3, the preparation method of the electrically heated fixed phase change heat-storing material used of building and heating, it is characterized in that, it is to be the paraffin 60wt%-80wt% of 18-23 with carbon number, thermoplastic elastomer: 15wt%-30wt%, and mineral filler 5%-10wt% handles according to following step:

1) to the mineral filler hydrothermal treatment consists that organises:

Mineral filler is dispersed in the aqueous solution of coupling agent, carries out drying behind the ultra-sonic dispersion;

2) after paraffin that is 18-23 with above-mentioned mineral filler and the carbon number that organises after handling and thermoplastic elastomer mix, mix taking-up placement then in ultra-high speed pulverizer high speed;

3) above-mentioned mixture is carried out blend under 130 ℃-150 ℃ and extrude compression molding in mould;

4) material surface after compression molding coats the layer of polyethylene composite membrane, and film and formed material are fitted closely.

4, the preparation method of the electrically heated fixed phase change heat-storing material used of building and heating as claimed in claim 3 is characterized in that described coupling agent is one or more in stearic acid, calcium stearate, the sodium stearate.

5, the electrically heated fixed phase change heat-storing material used of building and heating is characterized in that it contains:

Carbon number is paraffin, thermoplastic elastomer and the mineral filler of 18-23, and the content ratio is:

Carbon number is the paraffin of 18-23: 60wt%;

Polyolefine: 30wt%;

Thermoplastic elastomer: 5wt%;

Mineral filler: 5%wt%.

6, the electrically heated fixed phase change heat-storing material used of building and heating as claimed in claim 5 is characterized in that described mineral filler is a lime carbonate.

7, the electrically heated fixed phase change heat-storing material used of building and heating as claimed in claim 5 is characterized in that described polyolefine is one or more in high density polyethylene(HDPE), new LDPE (film grade), linear low density polyethylene or the polypropylene.

8, the preparation method of the electrically heated fixed phase change heat-storing material used of building and heating is characterized in that it is to be the paraffin 60wt% of 18-23 with carbon number, polyolefine 30wt%, and thermoplastic elastomer 5wt%, mineral filler 5%wt% handles according to following step:

1) to the mineral filler hydrothermal treatment consists that organises:

Mineral filler is dispersed in the aqueous solution of coupling agent, carries out drying behind the ultra-sonic dispersion;

2) after paraffin, polyolefine and the thermoplastic elastomer that is 18-23 with above-mentioned mineral filler and the carbon number that organises after handling mixes, mix taking-up placement then in ultra-high speed pulverizer high speed;

3) said mixture is carried out blend under 130 ℃-150 ℃ and extrude compression molding in mould;

4) material surface after compression molding coats the layer of polyethylene composite membrane, and film and formed material are fitted closely.

9, the preparation method of the electrically heated fixed phase change heat-storing material used of building and heating as claimed in claim 8 is characterized in that described coupling agent is one or more in stearic acid, calcium stearate, the sodium stearate.

10, the solar heating fixed phase change heat-storing material used of building and heating is characterized in that it contains:

Carbon number is paraffin, thermoplastic elastomer and the mineral filler of 16-20, and the content ratio is:

Carbon number is the paraffin of 16-20: 60wt%-80wt%;

Thermoplastic elastomer: 15wt%-30wt%;

Mineral filler: 5%-10wt%.

11, the solar heating fixed phase change heat-storing material used of building and heating as claimed in claim 10 is characterized in that described mineral filler is a lime carbonate.

12, the preparation method of the solar heating fixed phase change heat-storing material used of building and heating, it is characterized in that, it is to be the paraffin 60wt%-80wt% of 16-20 with carbon number, thermoplastic elastomer 15wt%-30wt%, and mineral filler 5%-10wt% handles according to following step:

1) to the mineral filler hydrothermal treatment consists that organises:

Mineral filler is dispersed in the aqueous solution of coupling agent, carries out drying behind the ultra-sonic dispersion;

2) after paraffin that above-mentioned organise mineral filler after handling and carbon number are 16-20 and thermoplastic elastomer mix,

Mix in ultra-high speed pulverizer high speed, take out then and place;

3) above-mentioned mixture is carried out blend under 130 ℃-150 ℃ and extrude compression molding in mould;

4) material surface after compression molding coats the layer of polyethylene composite membrane, and film and formed material are fitted closely.

13, the preparation method of the solar heating fixed phase change heat-storing material used of building and heating as claimed in claim 12 is characterized in that described coupling agent is one or more in stearic acid, calcium stearate, the sodium stearate.

14, the solar heating fixed phase change heat-storing material used of building and heating is characterized in that it contains:

Carbon number is paraffin, thermoplastic elastomer and the mineral filler of 16-20, and the content ratio is:

Carbon number is the paraffin of 16-20: 60wt%;

Polyolefine: 30wt%;

Thermoplastic elastomer: 5wt%;

Mineral filler: 5%wt%.

15, the solar heating fixed phase change heat-storing material used of building and heating as claimed in claim 14 is characterized in that described mineral filler is a lime carbonate.

16, the solar heating fixed phase change heat-storing material used of building and heating as claimed in claim 14 is characterized in that described polyolefine is one or more in high density polyethylene(HDPE), new LDPE (film grade), linear low density polyethylene or the polypropylene.

17, the preparation method of the solar heating fixed phase change heat-storing material used of building and heating is characterized in that it is to be the paraffin 60wt% of 16-20 with carbon number, polyolefine 30wt%, thermoplastic elastomer 5wt%, mineral filler: 5%wt%; Handle according to following step:

1) to the mineral filler hydrothermal treatment consists that organises:

Mineral filler is dispersed in the aqueous solution of coupling agent, carries out drying behind the ultra-sonic dispersion;

2) after paraffin, polyolefine and the thermoplastic elastomer that is 16-20 with above-mentioned mineral filler and the carbon number that organises after handling mixes, mix taking-up placement then in ultra-high speed pulverizer high speed;

3) above-mentioned mixture is carried out blend under 130 ℃-150 ℃ and extrude compression molding in mould;

4) material surface after compression molding coats the layer of polyethylene composite membrane, and film and formed material are fitted closely.

18, the preparation method of the solar heating fixed phase change heat-storing material used of building and heating as claimed in claim 17 is characterized in that described coupling agent is one or more in stearic acid, calcium stearate, the sodium stearate.