KR101589907B1 - Latent heat material composition having high enthalpy and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a latent heat material composition having high enthalpy, and a manufacturing method thereof. The composition shows excellent enthalpy due to a polymerization reaction performed at a relatively low temperature and high density, by mixing phase change microcapsule particles having different average diameter, and can maintain 0°C for a long time.

Description

[0001] The present invention relates to a latent heat material composition having a high enthalpy (0 DEG C) and a manufacturing method thereof,

The present invention relates to a latent heat material composition having two or three phase-change microcapsule particles having different average particle diameters mixed therein and having a high latent heat energy and an improved temperature holding time at 0 ° C, and a method for producing the same.

Phase change material (PCM) is a material that can store cold and heat using latent heat during phase change. In general, the most widely used heat storage material is water.

Water is cheap and readily available, has no toxicity and explosiveness, and has excellent properties as a phase change material. However, in the case of hot water storing hot water, corrosion of storage pipe due to heat can be caused, and ice storing cold heat is difficult to flow during filling or transportation, and a lot of expenses must be invested in order to equip necessary facilities for reuse . In addition, since ice for storing cold heat is generated below the freezing point, there is a problem that an increase in production cost and a long production time are required. Also, while water has a large latent heat energy, supercooling phenomenon appears to be significant during phase change and volume change is severe.

Therefore, as a solution to this problem, a new phase change material having convenience, simplicity, and economy in production, distribution and recovery process is required for easy handling as well as development of new heat and cold material for efficient cold and hot storage.

The conventional latent heat materials are classified into low temperature latent heat materials having a temperature of less than 10 ° C and middle and high temperature latent heat materials having a temperature range of more than 10 ° C are classified into organic materials and inorganic materials having a hydrate form. In order to provide a latent heat material in a mixed form, eutectic points are formed by using water and urea or other additional additives to be used in the hot-water cooling system.

On the other hand, when the food is kept at a constant supply of the cold source of the same strength, the temperature of the cooking vessel is continuously lowered. Therefore, a latent heat material is required to keep the temperature of the storage container constant.

Accordingly, there is a demand for a latent heat material capable of maintaining a low temperature for a predetermined time even if the cooling is stopped when the temperature is reached.

Korean Patent No. 0886820 Korean Patent No. 0524140

It is an object of the present invention to provide a latent heat material composition having a high latent heat energy and an improved temperature holding time at 0 占 폚.

Another object of the present invention is to provide a method for producing a latent heat material composition.

In order to achieve the above object, the latent heat composition of the present invention may be prepared by mixing two or three kinds of phase change microcapsule particles having different average particle sizes.

When the phase-change microcapsule particles having different average particle diameters are two kinds, the average particle diameter ratio of the first phase-change microcapsule particles having a relatively larger average particle diameter to the second phase-change microcapsule particles having a relatively smaller average particle diameter is 1.5 To 5.0. Specifically, the first phase-change microcapsule particles may have a size of 7.5 to 20.0 μm, and the second phase-change microcapsule particles may have a size of 1.5 to 6.0 μm.

The first phase-change microcapsule particles and the second phase-change microcapsule particles may be mixed in a weight ratio of 1: 1 to 8.

When the number of phase-change microcapsule particles having different average particle sizes is three, the average particle size ratio of the third phase-change microcapsule particles having a relatively large average particle diameter to the fifth phase-change microcapsule particles having the smallest average particle diameter is 3.0 to 10.0. In addition, the average particle size ratio of the fourth phase-change microcapsule particles having a relatively medium average particle size to the relatively small average particle size of the fifth phase-change microcapsule particles may be 1.5 to 4.0. Specifically, the size of the third phase-change microcapsule particles is 9 to 20 탆, the size of the fourth phase-change microcapsule particles is 5 to 8 탆, the size of the fifth phase- 4 [mu] m.

The third phase-change microcapsule particles, the fourth phase-change microcapsule particles, and the fifth phase-change microcapsule particles may be mixed at a weight ratio of 1: 1-3: 2-5.

The phase-change microcapsule particles may be in the form of microcapsules in which the polymer is encapsulated on the surface of the emulsion colloid.

The emulsified colloid may be a colloid emulsified at any rate selected from 200 to 2000 rpm of a mixture of water, phase change material and additive.

The phase change material may include a paraffin material mixed with a paraffinic material of C ₁₂ H _{26 and} a paraffin material of C ₁₄ H ₃₀ in a weight ratio of 1: 3 to 5, and a coagulant of C ₁₈ H ₃₈ .

The polymer may be one obtained by reacting melanin resin or gelatin with water.

The phase-change microcapsule particles may be formed by polymerizing the emulsion colloid and the polymer at 1 to 9 캜 for 2 to 4 hours.

According to another aspect of the present invention, there is provided a method for preparing a latent heat material composition, which comprises the steps of (A) mixing a mixture of water, a phase change material and an additive at a rate of 2 to 3 species selected from 200 to 2000 rpm Emulsifying each of the emulsified colloids having different average particle diameters;

(B) mixing each of the emulsified colloids having different average particle diameters with the polymer and polymerizing at 1 to 9 캜 to prepare each of the phase-change microcapsule particles having different average particle diameters; And

(C) mixing the phase-change microcapsule particles formed with each other.

According to another aspect of the present invention, there is provided a method for producing a latent heat material composition, comprising: (i) emulsifying a mixture of water, a phase change material and an additive at a relatively high rate, Producing a colloid;

(ii) further adding a mixture of the phase change material and the additive in the prepared emulsion colloid to emulsify the emulsion at a relatively low rate to produce an emulsion colloid having a relatively large average particle size;

(iii) mixing the emulsion colloid having the different average particle size with the polymer and polymerizing at 1 to 9 ° C to prepare phase-change microcapsule particles having different average particle diameters.

After the step (ii) of producing the emulsion colloid having a relatively large average particle diameter, a mixture in which the phase change material and the additive are mixed is prepared in the prepared emulsion colloid having a relatively large average particle size, To produce an emulsified colloid having a relatively larger average particle diameter.

When the phase-change microcapsule particles having different average particle diameters are two kinds, the mixture may be emulsified at 200 to 1400 rpm and 1500 to 1900 rpm, respectively.

When the phase-change microcapsule particles having different average particle sizes are two kinds, the first phase-change microcapsule having a particle size of 7 to 20 탆 and the second phase-change microcapsule having a particle size of 1.5 to 6 탆 are mixed in a ratio of 1: 1 to 8 by weight.

When the phase-change microcapsule particles having different average particle diameters are three kinds, the mixture may be emulsified at 200 to 1200 rpm, 1300 to 1600 rpm and 1700 to 2000 rpm, respectively.

When the phase-change microcapsule particles having different average particle sizes are three, the third phase-change microcapsule having a particle size of 9 to 20 탆, the fourth phase-change microcapsule having a particle size of 5 to 8 탆, The fifth phase-change microcapsules having a size of 1 to 4 占 퐉 may be mixed at a weight ratio of 1: 1-3: 2-5.

The latent heat material composition of the present invention has two or three phase-change microcapsule particles having different average particle diameters and exhibits a high enthalpy due to the polymerization reaction performed at an increased density and a relatively low temperature, ℃ can be maintained for a long time.

1 is a cross-sectional view of a phase-change microcapsule particle prepared according to an embodiment of the present invention.
2 is a view illustrating a process of preparing a latent heat material composition according to an embodiment of the present invention.
3 is a SEM photograph of the latent heat material composition prepared according to one embodiment of the present invention.

The present invention relates to a process for producing phase-change microcapsules comprising an inner material and an outer material using in-situ polymerization and mixing the phase-change microcapsule particles with two or three kinds of materials having different average particle diameters and exhibiting a high enthalpy, (Latent heat amount) and an improved temperature holding time at 0 ° C, and a method for producing the same.

Hereinafter, the present invention will be described in detail.

The latent heat composition of the present invention is a mixture of two or three kinds of phase-change microcapsule particles having different average particle diameters. The phase-change microcapsule particles are prepared by coating microcapsules (for example, encapsulated) (Fig. 1).

Emulsified colloid

The emulsified colloid can be obtained by emulsifying a mixture of water, a phase change material and an additive at a selected rate of 200 to 2000 rpm.

The phase change material may comprise a paraffinic material and a coagent of C ₁₈ H ₃₈ . The paraffinic material may be contained in an amount of 50.0 to 99.9% by weight based on the total weight of the phase change material. When the content of the paraffinic material is less than the lower limit value, the phase change microcapsule particles have a high enthalpy And may not be formed of particles in the case of exceeding the upper limit value. The crude nucleating agent may be contained in an amount of 0.1 to 0.5% by weight based on the total weight of the phase change material.

The paraffinic materials are C ₁₂ H ₂₆ of a paraffinic substance, and a paraffin-based substance C ₁₄ H ₃₀ 1: as mixed in a weight ratio of from 3 to 5, based on a paraffinic material C ₁₂ H ₂₆ C ₁₄ H ₃₀ If the content of the paraffinic substance is less than the lower limit, it can not be maintained for a long time. If the content exceeds the upper limit, it can not be maintained for a long time, and it may take a long time to cool down to 0 ° C.

In addition, the additive is not particularly limited as a dispersant or an emulsifier, and a kind of a dispersant and an emulsifier.

The water, the phase change material and the additive are mixed in a weight ratio of 1: 0.2-0.6: 0.01-0.1. When the weight ratio is out of the range, a colloid in which many particles are dispersed may not be produced.

Polymer

Melanin resin or gelatin and water at a weight ratio of 1: 9 to 9: 1, and then stirred at 50 to 70 ° C at 500 to 700 rpm for 2 to 4 hours to obtain a translucent liquid polymer.

The emulsified colloid can be prepared in various particle sizes according to the stirring speed. The emulsified colloid of the various particle sizes and the liquid polymer are mixed at a temperature of 1 to 9 캜, preferably 3 to 6 캜, more preferably 5 캜 For 2 to 4 hours to form phase-change microcapsule particles (FIG. 1) of various particle sizes.

When the temperature during the polymerization reaction is lower than the lower limit, the temperature holding time may not be excellent. When the upper limit is exceeded, although the emulsion colloid having different particle sizes is used, the sizes of the final formed microcapsules And can not have a high enthalpy because it can not form a latent heat composition at a good density.

As described above, the phase-change microcapsule particles having different average particle sizes can be mixed with two or three kinds to form a latent heat material composition.

Phase change microcapsule  Two species of particles

The two phase-change microcapsule particles having different average particle diameters have average particle diameter ratios of the first phase-change microcapsule particles having relatively large average particle diameters to the second phase-change microcapsule particles having a relatively small average particle diameter of 1.5 to 5.0 , Preferably 2.0 to 3.0. When the average particle diameter ratio of the two phase-change microcapsule particles is less than the lower limit value, it is impossible to have a good enthalpy. When the upper limit value is exceeded, the temperature holding time can be remarkably reduced.

The specific particle size of the two phase-change microcapsule particles having the above average particle size ratio, for example, the size of the first phase-change microcapsule particles is 7.5 to 20.0 탆, the size of the second phase- Is 1.5 to 6.0 mu m.

When the particle size of the phase-change microcapsule particles is different as described above, the average particle diameter of the phase-change microcapsule particles also varies within the respective particle size ranges, so that phase-change microcapsule particles having different average particle sizes are formed.

Also, the first phase-change microcapsule particles and the second phase-change microcapsule particles are mixed at a weight ratio of 1: 1 to 8, preferably 1: 3 to 5. When the weight ratio is less than the lower limit based on the first phase-change microcapsule particles, it can not have a high enthalpy. If the weight ratio exceeds the upper limit, the thermal physical properties may be lowered.

Phase change microcapsule  Three species of particles

The three phase-change microcapsule particles having different average particle sizes are composed of third phase-change microcapsule particles having a relatively large average particle size, fourth phase-change microcapsule particles having a relatively medium average particle size, And the smallest 5th phase change microcapsule particle.

The average particle diameter ratio of the third phase-change microcapsule particles having relatively large average particle diameter to the fifth phase-change microcapsule particles having the smallest average particle diameter is 3.0 to 10.0, preferably 5.0 to 10.0. If the average particle diameter ratio of the third and fifth phase-change microcapsule particles is less than the lower limit value, the thermal physical property may be lowered. If the average particle diameter ratio is larger than the upper limit value, many voids may be formed between the particles.

Also, the average particle size ratio of the fourth phase-change microcapsule particles having a relatively medium average particle size to the fifth phase-change microcapsule particles having the smallest average particle diameter is 1.5 to 4.0. When the average particle diameter ratio of the third and fifth phase-change microcapsule particles is less than the lower limit value, the temperature holding time may be reduced. If the average particle diameter ratio is higher than the upper limit value, the thermal property value may be lowered.

The specific particle size of the three phase-change microcapsule particles having the average particle diameter ratio as described above, for example, the size of the third phase-change microcapsule particles is 9 to 20 탆, and the size of the fourth phase- 5 to 8 占 퐉, and the size of the fifth phase-change microcapsule particles is 1 to 4 占 퐉.

The third phase-change microcapsule particles, the fourth phase-change microcapsule particles and the fifth phase-change microcapsule particles are mixed in a weight ratio of 1: 1-3: 2-5, preferably 1: 2-3: 3: 5 by weight. When the weight ratio is out of the above range, all physical properties such as thermal property and temperature holding time may be lowered.

In addition, the present invention can provide a method of providing the latent heat composition, and the latent heat material composition can be manufactured in two ways.

In one embodiment, the process for preparing a latent heat material composition of the present invention comprises the steps of (A) emulsifying a mixture of water, a phase change material and an additive at a rate of 2 to 3 selected from 200 to 2000 rpm, Preparing emulsified colloids each having three different average particle diameters; (B) mixing each of the emulsified colloids having different average particle diameters with the polymer and polymerizing at 1 to 9 캜 to prepare each of the phase-change microcapsule particles having different average particle diameters; And (C) mixing the formed phase-change microcapsule particles.

According to the production method as described above, a latent heat material composition in which two or three phase-change microcapsule particles having different average particle diameters are mixed can be prepared.

In another embodiment, as shown in FIG. 2, the process for preparing a latent heat material composition of the present invention comprises the steps of (i) emulsifying a mixture of water, a phase change material and an additive at a relatively high rate, Producing an emulsified colloid; (ii) further adding a mixture of the phase change material and the additive in the emulsion colloid to emulsify the emulsion at a relatively low rate to produce an emulsion colloid having a relatively large average particle size (FIG. (iii) mixing the emulsified colloid having different average particle diameters with the polymer (FIG. 2b) and polymerizing at 1 to 9 ° C to prepare phase-change microcapsule particles having different average particle sizes (FIG. 2c) can do.

As a result, it is possible to produce a latent heat material composition in which two phase-change microcapsule particles having different average particle diameters are mixed, but it is possible to produce a latent heat material composition in which three phase- For example,

A mixture in which the phase change material and the additive are mixed in the emulsion colloid having relatively large average particle diameter prepared in the step (ii) between the step (ii) and the step (iii) is further added, And adding a step of producing an emulsified colloid having a relatively larger average particle diameter by emulsification.

When two kinds of phase-change microcapsule particles having different average particle diameters are prepared according to the two kinds of production methods, the mixture is emulsified at 200 to 1400 rpm and 1500 to 1900 rpm, respectively; When three kinds of phase-change microcapsule particles having different average particle diameters are prepared, the mixture is emulsified at 200 to 1200 rpm, 1300 to 1600 rpm and 1700 to 2000 rpm, respectively, so that two or three Lt; RTI ID = 0.0 > microcapsule < / RTI >

Even if the latent heat material composition is prepared by any one of the above two methods, the same physical properties are shown regardless of the manufacturing method if the size and weight ratio of the phase-change microcapsule particles are the same.

In addition, since it exhibits excellent enthalpy due to the polymerization reaction performed at 1 to 9 ° C and high density, it is possible to provide a latent heat composition having a high latent heat energy and an improved temperature holding time.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

<Examples>

Manufacturing example  1. First Phase change microcapsule  The preparation of particles, Average particle diameter  15 탆

Water, a phase change material (C ₁₂ H ₂₆ 20 wt% C ₁₄ H ₃₀ 79.9 wt% and 0.1% by weight of C ₁₈ H _{38 as a} nucleating agent) and ethoxylate as an emulsifier at a weight ratio of 1: 0.3: 0.01 and emulsified at pH 5 and 580 rpm for 10 minutes at room temperature for 10 minutes to prepare an emulsion colloid.

On the other hand, the melanin resin and water were mixed at a weight ratio of 2: 7 and stirred at 60 ° C and 500 rpm for 4 hours to prepare a polymer.

The emulsion colloid and the polymer were mixed and polymerized at 5 ° C to prepare first phase-change microcapsule particles (average particle size: 15 μm) in the form of microcapsules in which the surface of the emulsion colloid was coated with a polymer. The pH was adjusted to 7 to terminate the microencapsulation reaction.

Manufacturing example  2. The second Phase change microcapsule  The preparation of particles, Average particle diameter  5 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 1600 rpm in the preparation of the second phase-change microcapsule particles (average particle diameter: 5 μm).

Manufacturing example  3. Third Phase change microcapsule  The preparation of particles, Average particle diameter  20 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 200 rpm in the preparation of the third phase-change microcapsule particles (average particle diameter: 20 μm).

Manufacturing example  4. Fourth Phase change microcapsule  The preparation of particles, Average particle diameter  7 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 1380 rpm in the preparation of the fourth phase-change microcapsule particles (average particle size: 7 μm).

Manufacturing example  5. Fifth Phase change microcapsule  The preparation of particles, Average particle diameter  2 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 1900 rpm in the production of the fifth phase-change microcapsule particles (average particle size: 2 μm).

Manufacturing example  6. First and second Phase change microcapsule  Particle production, angle Average particle diameter  15 탆, 5 탆

Water, a phase change material (C ₁₂ H ₂₆ 20 wt% C ₁₄ H ₃₀ 79.9 wt% and 0.1% by weight of C ₁₈ H _{38 as a} nucleating agent) and ethoxylate in a weight ratio of 1: 0.3: 0.01 with an emulsifier was emulsified at a rate of 580 rpm at pH 3.5 for 10 minutes at room temperature to prepare a first emulsified colloid Then, the mixture was added again and emulsified at a speed of 1600 rpm for 10 minutes at room temperature to prepare a second emulsified colloid.

On the other hand, the melanin resin and water were mixed at a weight ratio of 2: 7 and stirred at 60 ° C and 500 rpm for 4 hours to prepare a polymer.

The first and second emulsion colloids and the polymer were mixed and polymerized at 5 ° C to form first and second phase-change microcapsule particles (average particle diameter: 15 μm, 5 Mu m). The pH was adjusted to 7 to terminate the microencapsulation reaction.

Comparative Manufacturing Example  One. 1st Phase change microcapsule  The preparation of particles, Average particle diameter  5 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 1600 rpm in the preparation of the first phase-change microcapsule particles (average particle diameter: 5 μm).

Comparative Manufacturing Example  2. Second Phase change microcapsule  The preparation of particles, Average particle diameter  0.5 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 2300 rpm in the preparation of the second phase-change microcapsule particles (average particle size: 0.5 μm).

Comparative Manufacturing Example  3. Third Phase change microcapsule  The preparation of particles, Average particle diameter  8 ㎛

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 1300 rpm in the production of the third phase-change microcapsule particles (average particle size: 8 μm).

Comparative Manufacturing Example  4. Fourth Phase change microcapsule  The preparation of particles, Average particle diameter  2 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 1900 rpm in the production of the fourth phase-change microcapsule particles (average particle size: 2 μm).

Comparative Manufacturing Example  5. Fourth Phase change microcapsule  The preparation of particles, Average particle diameter  0.5 탆

The emulsion colloid was prepared in the same manner as in Preparation Example 1 except that the emulsion colloid was stirred at 2300 rpm in the preparation of the fourth phase-change microcapsule particles (average particle diameter: 0.5 μm).

Example  1. Two kinds Phase change microcapsule  Mixing of particles

The first phase-change microcapsule particles prepared in Preparation Example 1 and the second phase-change microcapsule particles prepared in Preparation Example 2 were mixed at a weight ratio of 1: 3 and then lyophilized to prepare a powdery latent heat- Respectively.

Example  2. Three species Phase change microcapsule  Mixing of particles

The third phase-change microcapsule particles prepared in Preparation Example 3, the fourth phase-change microcapsule particles prepared in Preparation Example 4, and the fifth phase-changed microcapsule particles prepared in Preparation Example 5 were mixed in a ratio of 1: 3: 4, and then lyophilized to prepare a powdery latent heat material composition.

Example  3. Two species Phase change microcapsule  Mixing of particles

The mixture of the first phase change microcapsule particles and the second phase change microcapsule particles prepared in Preparation Example 6 was lyophilized to prepare a powdery latent heat material composition. At this time, the first phase-change microcapsule particles and the second phase-change microcapsule particles were mixed at a weight ratio of 1: 3.

Comparative Example  One. Average particle size  Composed of the same particles only

Only the first phase-change microcapsule particles having an average particle size of 15 μm prepared in Preparation Example 1 were lyophilized to prepare a powdery latent heat material composition.

Comparative Example  2. Different particle sizes

Except that the phase-change microcapsule particles prepared in Comparative Preparation Examples 1 to 2 were used in place of the phase-change microcapsule particles prepared in Preparation Examples 1 to 2 in the same manner as in Example 1, The composition was prepared.

Comparative Example  3. Phase change microcapsule  The mixing ratio of particles

The first phase-change microcapsule particles prepared in Preparation Example 1 and the second phase-change microcapsule particles prepared in Preparation Example 2 were mixed at a weight ratio of 1: 0.3, A composition was prepared.

Comparative Example  4. Different particle sizes

Except that the phase-change microcapsule particles prepared in Comparative Preparation Examples 3 to 5 were used in place of the phase-change microcapsule particles prepared in Preparation Examples 3 to 5, The composition was prepared.

Comparative Example  5. Phase change microcapsule  The mixing ratio of particles

Except that the third phase-change microcapsule particles prepared in Preparation Example 3, the fourth phase-change microcapsule particles prepared in Preparation Example 4, and the fifth phase prepared in Production Example 5 were used in the same manner as in Example 2, Modified microcapsule particles were mixed at a weight ratio of 1: 0.5: 7 to prepare a latent heat material composition.

< Test Example >

Test Example  One. SEM  shooting

3 is a SEM photograph of the latent heat material composition prepared according to Example 1 of the present invention.

As shown in FIG. 3, it was confirmed that the latent heat-generating composition of Example 1 contained two kinds of phase-change microcapsule particles having different average particle diameters and formed with high density without voids.

Test Example  2. Maintain at 0 ℃ Latent heat Thermal property  And enthalpy  Measure

2-1. Latent heat energy (latent heat) measurement (J / g) was measured using a DSC (Differential Scanning Calorimeter), UNIX DSC 7 (PERKIN ELMER, USA).

2-2. Enthalpy (ΔH): Measured using a DSC (Differential Scanning Calorimeter), UNIX DSC 7 (PERKIN ELMER, USA).

division Latent heat energy (J / g) The enthalpy (? H) Freezing point Melting point Example 1 202.13 211.69 211.34 Example 2 194.53 201.05 202.41 Example 3 203.47 216.54 212.09 Comparative Example 1 110.28 114.28 164.33 Comparative Example 2 146.35 150.26 191.08 Comparative Example 3 124.17 129.54 184.62 Comparative Example 4 130.56 132.47 179.41 Comparative Example 5 120.12 121.69 170.24

As shown in Table 1, the latent heat-treating composition prepared according to Examples 1 to 3 of the present invention showed excellent latent heat energy and high enthalpy values as compared with the latent heat-treating composition prepared according to Comparative Examples 1 to 5 . In particular, Comparative Example 1, which was produced only with phase-change microcapsule particles of the same average particle size, showed the lowest latent heat energy and enthalpy values.

Test Example  3. Temperature maintaining characteristics

To confirm the temperature holding characteristics of the latent heat composition prepared in Examples and Comparative Examples, a temperature measuring device composed of a heat source, a temperature sensor, and a control and measuring device was used.

200 ml of the latent heat material composition prepared in Examples and Comparative Examples and 100 g of ginseng were placed in a container, cooled to 0 ° C, and the temperature was measured in a natural state. The temperature of the center of the container filled with the latent heat material was measured. When the temperature reached 0 ° C, the source of the heat source was removed. The experiment was repeated 3 times and the average temperature was 13.5 ℃.

Table 2 shows the cooling time required to cool down to 0 캜 in the experimental procedure and the temperature retention time at 0 캜 (짹 0.5 캜) as the low-temperature retention time, respectively.

division Cooling time Low temperature holding time Example 1 12 minutes 15th Example 2 9 minutes 12th Example 3 11 minutes 14 days Comparative Example 1 8 minutes 3 days Comparative Example 2 11 minutes 6 days Comparative Example 3 12 minutes 5 days Comparative Example 4 10 minutes 4 days Comparative Example 5 14 minutes 5 days

As shown in Table 2 above, it was confirmed that the latent heat-treating composition prepared according to Examples 1 to 3 of the present invention maintained a much lower temperature holding time than the latent heat-treating composition of Comparative Examples 1 to 5. In particular, it was confirmed that the latent heat-generating composition of Comparative Example 1 had a very short time to maintain the temperature at 0 ° C.

Claims (18)

3 phase-change microcapsule particles having different average particle diameters are mixed;
I) a third phase-change microcapsule particle having an average particle size of 9 to 20 m, ii) a fourth phase-change microcapsule particle having an average particle size of 5 to 8 m, and iii) an average particle size The first phase-change microcapsule particles having a size of 1 to 4 탆 are mixed at a weight ratio of 1: 1-3: 2-5;
The phase-change microcapsule particles are in the form of microcapsules in which a polymer is encapsulated on the surface of an emulsion colloid. The emulsion colloid and the polymer are polymerized at 1 to 9 ° C to obtain phase-change microcapsule particles having different average particle sizes,
Wherein the emulsion colloid is a mixture of water, a mixture of a paraffinic material of C ₁₂ H _{26 and} a paraffinic material of C ₁₄ H ₃₀ in a weight ratio of 1: 3 to 5, and an additive mixture at 200 to 2000 rpm Three kinds of emulsions emulsified at three kinds of speed and different in average particle size Wherein a colloid is produced. The latent heat material composition according to claim 1, wherein the three types of emulsifying colloid are 1700 to 2000 rpm, 1300 to 1600 rpm and 200 to 1200 rpm, respectively. delete delete delete The latent heat material composition according to claim 1, wherein the polymer is melanin resin or gelatin reacted with water. The latent heat-generating composition according to claim 1, wherein the phase-change microcapsule particles are formed by polymerizing an emulsified colloid and a polymer at 1 to 9 ° C for 2 to 4 hours. delete delete delete The method according to claim 1, wherein the average particle diameter ratio of the third phase-change microcapsule particles having relatively large average particle sizes to the fifth phase-change microcapsule particles having the smallest average particle diameter is 3.0 to 10.0. Gt; 12. The microcapsule according to claim 11, wherein the average particle size ratio of the fourth phase-change microcapsule particles having a relatively small mean particle diameter to the fifth phase-change microcapsule particles having the smallest average particle diameter is 1.5 to 4.0 / RTI &gt; delete delete (A) a mixture of a paraffinic material of C ₁₂ H _{26 and} a paraffinic material of C ₁₄ H ₃₀ in a weight ratio of 1: 3 to 5 and a mixture of the additives, Respectively, to produce emulsified colloids each having an average particle diameter of three different types;
(B) mixing each of the emulsified colloids having different average particle diameters with the polymer and polymerizing at 1 to 9 캜 to prepare each of the phase-change microcapsule particles having three different average particle sizes; And
(C) mixing the phase-change microcapsule particles with each other,
I) a third phase-change microcapsule particle having an average particle size of 9 to 20 m, ii) a fourth phase-change microcapsule particle having an average particle size of 5 to 8 m, and iii) an average particle size Wherein the fifth phase-change microcapsule particles having a size of 1 to 4 占 퐉 are mixed at a weight ratio of 1: 1-3: 2-5. A method for producing a latent heat material comprising three kinds of phase-change microcapsule particles having different average particle diameters,
(i) water, a mixture of a paraffinic substance of C ₁₂ H _{26 and} a paraffinic substance of C ₁₄ H ₃₀ in a weight ratio of 1: 3 to 5, and an additive are mixed at a speed of 1700 to 2000 rpm Emulsifying the emulsion to prepare a fifth emulsified colloid having an average particle diameter of 1 to 4 탆;
(ii) a mixture obtained by mixing a paraffinic substance of C ₁₂ H _{26 and} a paraffin substance of C ₁₄ H ₃₀ in a weight ratio of 1: 3 to 5, and an additive in the prepared emulsion colloid is further added Emulsifying at a speed of 1300 to 1600 rpm to produce a fourth emulsified colloid having an average particle diameter of 5 to 8 占 퐉;
(iii) a mixture of a paraffinic substance of C ₁₂ H _{26 and} a paraffin substance of C ₁₄ H ₃₀ in a weight ratio of 1: 3 to 5, and an additive mixed in the emulsion colloid prepared in the step (ii) Further adding a mixture and emulsifying the mixture at a speed of 200 to 1200 rpm to produce a third emulsified colloid having an average particle diameter of 9 to 20 탆; And
(Iv) mixing the emulsified colloid having the average particle size of the three different types with the polymer and polymerizing the mixture at 1 to 9 DEG C to prepare three kinds of phase-change microcapsule particles having different average particle diameters,
I) the third phase-change microcapsule particles, ii) the fourth phase-change microcapsule particles and iii) the fifth phase-change microcapsule particles are 1: 1-3: 2-5 By weight based on the total weight of the latent heat-resistant composition.
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