CN103302932B - Containing heat-insulation constant temperature plastic material and the production technology of sizing phase-change material - Google Patents

Abstract

The invention discloses a heat-insulating and constant-temperature plastic profile containing a shaped phase change material and a production process, comprising: a thermal plastic profile, a plurality of concave holes are uniformly arranged on the thermal plastic profile, and a hollow hole is arranged in the concave hole The activated carbon adsorbed sodium sulfate is provided with a thermal plastic sheet covering layer on the thermal plastic profile, and the thermal plastic sheet covering layer covers the activated carbon adsorbed sodium sulfate in the concave hole. The advantages are: using sodium sulfate decahydrate as the phase change material, the phase change temperature of sodium sulfate is suitable, the latent heat of phase change is large, and the price is low. Since activated carbon is a porous material, the additional pressure of the liquid phase of the micropores can play a role in sealing the phase change liquid. Function, the heterogeneous point of the micropore wall and the small size of the hole are beneficial to the nucleation and crystallization of sodium sulfate decahydrate, thereby reducing the supercooling degree of sodium sulfate decahydrate. The activated carbon is encapsulated with hollow thermoplastic plastic with concave holes to solve the problem. The leakage problem of the phase change material is solved, and the shape and size of the material can be adjusted.

Description

Heat-insulating and constant-temperature plastic profile containing shaped phase-change material and its production process

technical field

The invention relates to a pet product and its production process, in particular to a heat-insulating and constant-temperature plastic profile containing a shaped phase-change material and its production process.

Background technique

Shaped phase change materials (PCM) can absorb the heat (cold) of the environment during the phase change process, and release heat (cold) to the environment when needed, so as to achieve the purpose of controlling the temperature of the surrounding environment. Crystalline hydrate is the most common phase change material, but when it is packaged with inorganic materials, it is prone to leakage. Therefore, after several phase change cycles, the phase change heat will decrease, affecting its ability.

The patent application number 201210544805 discloses a shaped phase change material that can enhance heat storage and exchange efficiency and its preparation method. The invention uses higher fatty alcohol, fatty acid, high-density polyethylene, ethylene-vinyl acetate copolymer and 800 -A mixture of 1000-mesh aluminum powder is used as a phase-change material, and the phase-change material is obtained by molding with a flat vulcanizer. The latent heat of the prepared material is above 90J/g, which is easy to process, smooth and tidy in appearance, without leakage, and has excellent strength and toughness. , can be used in different parts of the building.

The invention patent with application number 201110264111 discloses a phase change energy storage material and its preparation method. The phase change energy storage composite material of the invention uses expanded graphite as a carrier to absorb organic fatty acids in different proportions, and then the prepared material is externally Cover with a layer of composite finishing agent. The adsorption of organic fatty acids into the expanded graphite carrier improves the thermal conductivity of organic acids as phase change materials, and suppresses the problem of liquid leakage when they are applied in heat storage technology. The composite coating agent also plays a role in strengthening the shape. The application number is 201110261909, which discloses a phase-change energy storage microcapsule and its preparation method. The invention adopts the method of coating sub-microcapsules. The phase-change energy storage microcapsules provided by this method are not easy to fail, have a long service life, Good stability.

The patent application number 201210467994 discloses a paraffin-felt phase change composite heat storage material, which is mainly composed of paraffin wax and felt, which is prepared by dipping the felt in molten paraffin, absorbing the felt fully, and taking it out to cool and solidify . This patent uses paraffin as the phase change material and felt as the adsorption and support structure, which overcomes the shortcomings of paraffin liquid phase flow and fast heat dissipation. The prepared paraffin-felt phase change composite heat storage material has a light specific gravity and basically no Flowing, stable in shape, non-corrosive, and has better and unexpected heat storage and insulation effects.

The above patents all use organic phase change materials, which have the advantages of being easy to shape and not easy to leak, but there is a problem of high price, and at the same time, the latent heat of phase change of organic materials is smaller than that of inorganic phase change materials.

The patent application number 200910236014.2 discloses a method for preparing sodium sulfate/silicon oxide shape-changing material using rice husk ash as a raw material. In this method, rice husk ash is added to NaOH solution, heated, cooled, filtered, and the filtrate is titrated with sulfuric acid solution. The final pH of the solution is controlled to be 6-10 to obtain a sol; the sol is left to stand, aged, washed, and then dried at 60-100° C. to prepare a sodium sulfate/silicon oxide shape-changing material. The phase transition temperature of the prepared sodium sulfate/silicon oxide shape-setting phase change material is between 860°C and 890°C, the heat of phase transition fusion is 40J/g-90J/g, and the particle size of sodium sulfate distributed in the silicon oxide is 100-300nm.

The sodium sulfate in the above-mentioned patent is anhydrous sodium sulfate, which is a high-temperature phase change material, and sodium sulfate containing 10 crystal waters is essentially two kinds of substances, which are very different in phase change process and thermal performance of phase change.

Contents of the invention

The technical problem to be solved by the present invention is to provide a heat-insulating and constant-temperature plastic profile containing a shaped phase-change material and a production process.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: heat-insulating and constant-temperature plastic profiles containing shaped phase change materials, including: thermal plastic profiles, a number of concave holes are uniformly arranged on the thermal plastic profiles, and Activated carbon with adsorbed sodium sulfate is arranged in the concave hole, and a thermal plastic sheet covering layer is arranged on the thermal plastic profile, and the thermal plastic sheet covering layer covers the activated carbon adsorbed with sodium sulfate in the concave hole .

In order to better solve the above technical problems, the further technical solution adopted by the present invention is: the distance between the concave holes is 10-20mm, the depth of the concave holes is 10-20mm, and the radius of the concave holes is 5-15mm.

In order to better solve the above-mentioned technical problems, the further technical solution adopted by the present invention is: the production process of heat-insulating and constant-temperature plastic profiles containing shaped phase-change materials, including the following steps:

A． Preparation of activated carbon with sodium sulfate adsorbed by stereotyped phase change materials: prepare Na ₂ SO ₄ saturated solution according to 142 parts of Na ₂ SO ₄ and 180 parts of H ₂ O (molar ratio 1:10); add 100 parts of activated carbon to 30 -80 parts of Glauber's salt Na ₂ SO ₄ saturated solution, so that the Na ₂ SO ₄ saturated solution is completely absorbed by activated carbon;

B． Preparation of thermoplastic profiles with concave holes: prepare thermoplastic profiles with multiple concave holes by extrusion blow molding, the extrusion temperature is 130-190°C, and the blowing air pressure is 0.5-2Mpa;

C． Encapsulation of activated carbon with sodium sulfate adsorbed on the finalized phase change material: place the activated carbon adsorbed with sodium sulfate in the concave hole, heat the pre-extruded thermal plastic sheet covering layer to 120-190°C, and make the thermal plastic The sheet covering layer is closely attached to the upper end of the thermal plastic profile with concave holes, and the concave holes are sealed by applying pressure at a pressure of 0.5-1.5Mpa to obtain a heat-insulating and constant-temperature plastic profile.

In order to better solve the above-mentioned technical problems, the further technical solution adopted by the present invention is: the thermoplastic profile can be polypropylene, polyethylene or polystyrene.

The advantages of the present invention are: the above-mentioned heat-insulating and constant-temperature plastic profiles containing shaped phase change materials and the production process use sodium sulfate decahydrate as the phase change material, the phase change temperature of sodium sulfate is suitable, the latent heat of phase change is large, and the price is low. For porous materials, the additional pressure of the liquid phase of the micropores can play a role in sealing the phase change fluid. The heterogeneous points on the walls of the micropores and the small size of the pores are conducive to the nucleation and crystallization of sodium sulfate decahydrate, thereby reducing the decahydrate. The supercooling degree of sodium sulfate in water, the hollow thermoplastic with concave holes is used to encapsulate the activated carbon, which solves the leakage problem of the phase change material, and the shape and size of the material can be adjusted.

Description of drawings

Figure 1 is a schematic structural view of the heat-insulating and constant-temperature plastic profile containing the shaped phase change material of the present invention.

Fig. 2 is a schematic structural view of the heat-insulating and constant-temperature plastic profile containing the shaped phase change material in Fig. 1 after removing the covering layer of the thermal plastic sheet.

In the figure: 1. Thermoplastic profile, 2. Concave hole, 3. Activated carbon, 4. Thermoplastic sheet covering layer.

detailed description

The specific content of the present invention will be described in detail below by means of the accompanying drawings and specific embodiments.

The heat-insulating and constant-temperature plastic profile containing the shaped phase-change material includes: a thermal plastic profile 1, a plurality of concave holes 2 are evenly arranged on the thermal plastic profile 1, and sodium sulfate is adsorbed in the concave hole 2. Activated carbon 3 is provided with a thermal plastic sheet covering layer 4 on the thermal plastic profile 1 , and the thermal plastic sheet covering layer 4 covers the activated carbon 3 adsorbed with sodium sulfate in the concave hole 2 .

In this embodiment, the distance between the concave holes 2 is 10-20 mm, the depth of the concave holes 2 is 10-20 mm, and the radius of the concave holes 2 is 5-15 mm.

The production process of the above-mentioned heat-insulating and constant-temperature plastic profiles containing shaped phase-change materials includes the following steps:

A． The preparation of activated carbon 3 with sodium sulfate adsorbed by the stereotyped phase change material: according to 142 parts of Na ₂ SO ₄ and 180 parts of H ₂ O (molar ratio 1:10), a saturated solution of Na ₂ SO ₄ was prepared; 100 parts of activated carbon were added to 30-80 parts of Glauber's salt Na ₂ SO ₄ saturated solution, so that the Na ₂ SO ₄ saturated solution is completely absorbed by activated carbon;

B． Preparation of thermoplastic profile 1 with concave holes 2: prepare thermoplastic profile 1 with multiple concave holes 2 by extrusion blow molding, extrusion temperature is 130-190°C, blowing air pressure is 0.5- 2Mpa;

C． Encapsulation of activated carbon 3 with sodium sulfate adsorbed on the shaped phase change material: place the activated carbon 3 adsorbed with sodium sulfate in the concave hole 2, heat the pre-extruded thermal plastic sheet covering layer 4 to 120-190°C, The thermal plastic sheet covering layer 4 is closely attached to the upper end of the thermal plastic profile 1 with the concave hole 2, and the concave hole 2 is sealed by applying pressure at a pressure of 0.5-1.5Mpa to obtain a thermally insulating and constant temperature plastic profile.

The thermoplastic profile 1 can be polypropylene, polyethylene or polystyrene.

Example 1

The production process of heat-insulating and constant-temperature plastic profiles containing shaped phase-change materials includes the following steps:

A． The preparation of activated carbon 3 with sodium sulfate adsorbed by the stereotyped phase change material: according to 142 parts of Na ₂ SO ₄ and 180 parts of H ₂ O (molar ratio 1:10), a saturated solution of Na ₂ SO ₄ was prepared; 100 parts of activated carbon were added to 30-80 parts of Glauber's salt Na ₂ SO ₄ saturated solution, so that the Na ₂ SO ₄ saturated solution is completely absorbed by activated carbon;

B． Preparation of a thermoplastic profile 1 with concave holes 2: a polyethylene hollow profile with a plurality of concave holes 2 is prepared by extrusion blow molding, the distance between the concave holes 2 is 10mm, and the depth of the concave holes 2 is 10mm, the radius of concave hole 2 is 5mm, the extrusion temperature is 130-190℃, and the blowing air pressure is 1Mpa;

C． Encapsulation of activated carbon 3 with sodium sulfate adsorbed on the shaped phase change material: 50 grams of activated carbon 3 adsorbed with sodium sulfate is placed in the concave hole 2, and the pre-extruded thermal plastic sheet covering layer 4 is heated to 150°C, The thermal plastic sheet covering layer 4 is closely attached to the upper end of the polyethylene hollow profile with the concave hole 2, and the concave hole 2 is sealed by applying pressure, and the applied pressure is 1Mpa to obtain a heat-insulating constant temperature plastic profile.

The obtained profile is assembled into a pet house, placed in an environment of 40°C, and kept at 25°C in the kennel, and the heat preservation time reaches 6 hours.

Example 2

The production process of heat-insulating and constant-temperature plastic profiles containing shaped phase-change materials includes the following steps:

A． The preparation of activated carbon 3 with sodium sulfate adsorbed by the stereotyped phase change material: according to 142 parts of Na ₂ SO ₄ and 180 parts of H ₂ O (molar ratio 1:10), a saturated solution of Na ₂ SO ₄ was prepared; 100 parts of activated carbon were added to 30-80 parts of Glauber's salt Na ₂ SO ₄ saturated solution, so that the Na ₂ SO ₄ saturated solution is completely absorbed by activated carbon;

B． Preparation of a thermoplastic profile 1 with concave holes 2: a polyethylene hollow profile with a plurality of concave holes 2 is prepared by extrusion blow molding, the distance between the concave holes 2 is 15mm, and the depth of the concave holes 2 is 15mm, the radius of concave hole 2 is 10mm, the extrusion temperature is 130-190℃, and the blowing air pressure is 1Mpa;

C． Encapsulation of activated carbon 3 with sodium sulfate adsorbed on the shaped phase change material: 100 grams of activated carbon 3 adsorbed with sodium sulfate is placed in the concave hole 2, and the pre-extruded thermal plastic sheet covering layer 4 is heated to 180°C, The thermal plastic sheet covering layer 4 is closely attached to the upper end of the polyethylene hollow profile with the concave hole 2, and the concave hole 2 is sealed by applying pressure, and the applied pressure is 1Mpa to obtain a heat-insulating constant temperature plastic profile.

The obtained profile is assembled into a pet house, placed in an environment of 40°C, and kept at 25°C in the kennel, and the heat preservation time reaches 8 hours.

Example 3

The production process of heat-insulating and constant-temperature plastic profiles containing shaped phase-change materials includes the following steps:

A． The preparation of activated carbon 3 with sodium sulfate adsorbed by the stereotyped phase change material: according to 142 parts of Na ₂ SO ₄ and 180 parts of H ₂ O (molar ratio 1:10), a saturated solution of Na ₂ SO ₄ was prepared; 100 parts of activated carbon were added to 30-80 parts of Glauber's salt Na ₂ SO ₄ saturated solution, so that the Na ₂ SO ₄ saturated solution is completely absorbed by activated carbon;

B． Preparation of a thermoplastic profile 1 with concave holes 2: a polyethylene hollow profile with a plurality of concave holes 2 is prepared by extrusion blow molding, the distance between the concave holes 2 is 20mm, and the depth of the concave holes 2 is 20mm, the radius of concave hole 2 is 15mm, the extrusion temperature is 130-190℃, and the blowing air pressure is 1Mpa;

C． Encapsulation of activated carbon 3 with sodium sulfate adsorbed on the finalized phase change material: 200 grams of activated carbon 3 adsorbed with sodium sulfate is placed in the concave hole 2, and the pre-extruded thermal plastic sheet covering layer 4 is heated to 180°C. The thermal plastic sheet covering layer 4 is closely attached to the upper end of the polyethylene hollow profile with the concave hole 2, and the concave hole 2 is sealed by applying pressure, and the applied pressure is 1Mpa to obtain a heat-insulating constant temperature plastic profile.

The profiles obtained are assembled into a pet house, placed in an environment of 40°C, and kept at 25°C in the kennel, and the heat preservation time reaches 10 hours.

The present invention is not limited to the schemes listed in the above embodiments, as long as the schemes mentioned in the content of the present invention can be implemented.

Claims (2)

1. containing the production technology of the heat-insulation constant temperature plastic material of sizing phase-change material, the described heat-insulation constant temperature plastic material containing sizing phase-change material comprises: thermoplastic sections (1), described thermoplastic sections (1) is evenly provided with multiple shrinkage pool (2), the active carbon (3) having adsorbed sodium sulphate is provided with in shrinkage pool (2), thermoplastic plastic sheet's cover layer (4) is provided with on described thermoplastic sections (1), the active carbon adsorbing sodium sulphate (3) covers in shrinkage pool (2) by thermoplastic plastic sheet's cover layer (4), it is characterized in that: containing the production technology of the heat-insulation constant temperature plastic material of sizing phase-change material, comprise the steps:

A. sizing phase-change material has adsorbed the preparation of the active carbon (3) of sodium sulphate: be the Na of 1:10 by mol ratio ₂sO ₄with H ₂o is mixed with Na ₂sO ₄saturated solution; 100 parts of active carbons are joined 30-80 part saltcake Na ₂sO ₄saturated solution, makes Na ₂sO ₄saturated solution is absorbed by active carbon completely;

The preparation of the thermoplastic sections (1) B. with shrinkage pool (2): by the thermoplastic sections (1) of the method preparation multiple shrinkage pool of band (2) of extrusion-blown modling, extrusion temperature is 130-190 DEG C, and blow air pressure is 0.5-2MPa;

C. sizing phase-change material has adsorbed the encapsulation of the active carbon (3) of sodium sulphate: be positioned over by the active carbon adsorbing sodium sulphate (3) in shrinkage pool (2), the thermoplastic plastic sheet's cover layer (4) extruded in advance is heated to 120-190 DEG C, thermoplastic plastic sheet's cover layer (4) is fitted tightly with thermoplastic sections (1) upper end of band shrinkage pool (2), pressurize shrinkage pool (2) is closed, applied pressure is 0.5-1.5MPa

Obtain heat-insulation constant temperature plastic material.

2., according to the production technology of the heat-insulation constant temperature plastic material containing sizing phase-change material according to claim 1, it is characterized in that: described thermoplastic sections (1) is polypropylene, polyethylene or polystyrene section bar.