WO2023090698A1 - Eco-friendly cold insulator composition and cold insulation pack comprising same - Google Patents

Abstract

The present invention relates to an eco-friendly cold insulator composition and a cold insulation pack comprising same, and, more specifically, the cold insulator composition may comprise an amorphous oxide, a binary ionic compound, and water, and the total organic carbon (TOC) of the cold insulator composition can be 0-1 ppm.

Description

Eco-friendly cooling agent composition and cooling pack containing the same

The present invention relates to an eco-friendly coolant composition and a cold pack including the same, and more specifically, to a cool pack that includes the same and an eco-friendly coolant composition capable of maintaining cool performance for a long period of time at the same time.

The cooling agent serves to keep food, medicine, etc. inside the sealed container at a low temperature for a certain period of time. When ice is used as a cooling agent, there is a problem in that the ice melts and water flows outside, contaminating stored items or damaging sealed containers. Accordingly, a super absorbent polymer (SAP) is used as a main component of a coolant composition to replace ice.

Superabsorbent polymers can absorb water up to 40 to 1,000 times their own weight by expanding their volume, and can provide cool air for a long time when frozen, so they have been used as a major component of coolant compositions. However, superabsorbent polymers are classified as microplastics. When superabsorbent polymers are released, plankton and marine organisms ingest microplastics, resulting in destruction of the ecosystem. Accordingly, environmental regulations on coolant compositions have recently become stricter, and the discharge of superabsorbent polymers is limited.

As an alternative, there has been an attempt to apply edible powder such as starch or wheat flour as the main component of the coolant composition, but there was a problem that it could not be used as a coolant composition for a long time due to bacterial propagation. In addition, in the case of edible powder, there was a problem that the stability of the coolant composition may be lowered because it has a small bulk density. Accordingly, research on a coolant composition that can secure eco-friendliness and maintain high cool performance is ongoing.

An object to be solved by the present invention is to provide a coolant composition capable of maintaining cool performance for a long period of time while having eco-friendliness.

Another problem to be solved by the present invention is to provide a cold pack containing the coolant composition.

According to the concept of the present invention, the coolant composition may include an amorphous oxide, a binary ionic compound, and water, and the total organic carbon (TOC) of the coolant composition is 0 ppm to It may be 1 ppm.

According to another concept of the present invention, the cooling pack may include the cooling agent composition and a packaging material for sealing the cooling agent composition.

Since the coolant composition according to the present invention does not contain polymers and organic compounds and has a very low total organic carbon (TOC), it can be discharged and has eco-friendliness. At the same time, since the coolant composition according to the present invention includes an amorphous oxide having a three-dimensional three-dimensional structure, it can maintain cool performance for a long time. In addition, the coolant composition according to the present invention can maintain a stable dispersion state in an aqueous solution, and can prevent bacterial propagation or contamination of stored goods, so that long-term storage properties can be secured.

1 is a cross-sectional view showing a cold pack including an amorphous oxide according to embodiments of the present invention.

2 is an enlarged view showing the structure of an amorphous oxide according to embodiments of the present invention.

In order to fully understand the configuration and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be implemented in various forms and various changes may be made. However, it is provided to complete the disclosure of the present invention through the description of the present embodiments, and to completely inform those skilled in the art of the scope of the invention to which the present invention belongs.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. The terms 'comprises' and/or 'comprising' used in the specification do not exclude the presence or addition of one or more other elements.

1 is a cross-sectional view showing a cold pack including an amorphous oxide according to embodiments of the present invention. 2 is an enlarged view showing the structure of an amorphous oxide according to embodiments of the present invention.

Referring to FIGS. 1 and 2 , the cold pack CP may include a coolant composition CC and a packaging material PM. The coolant composition (CC) may include an amorphous oxide, a binary ionic compound, and water.

An amorphous oxide according to embodiments of the present invention may include at least one of an amorphous metal oxide and an amorphous metalloid oxide. The amorphous metal oxide may include an amorphous transition metal oxide or an amorphous post-transition metal oxide. The amorphous transition metal oxide may include, for example, titania (TiO ₂ ) or zirconia (ZrO ₂ ). The amorphous post-transition metal oxide may include, for example, alumina (Al ₂ O ₃ ). The amorphous metalloid oxide may include, for example, silica (SiO ₂ ).

In some embodiments, the amorphous oxide may include, for example, at least one selected from titania (TiO ₂ ), alumina (Al ₂ O ₃ ), silica (SiO ₂ ), and zirconia (ZrO ₂ ). In some embodiments, the amorphous oxide may include, for example, at least two selected from titania (TiO ₂ ), alumina (Al ₂ O ₃ ), silica (SiO ₂ ), and zirconia (ZrO ₂ ). In some embodiments, amorphous oxides may include amorphous metal oxides and amorphous metalloid oxides. For example, the amorphous oxide may include at least one selected from titania (TiO ₂ ), alumina (Al ₂ O ₃ ), and zirconia (ZrO ₂ ) and silica (SiO ₂ ).

Amorphous oxide according to embodiments of the present invention may include an aggregate (AG) formed by connecting a plurality of primary particles (PP). In detail, the primary particles PP may be connected to each other due to collisions to form aggregates AG. Accordingly, the aggregate AG may have a three-dimensional structure including branches. Amorphous oxides may be miscible with other compounds in aqueous solution. For example, an aqueous solution may be confined within a three-dimensional branched structure of amorphous oxide, and the aggregate (AG) of amorphous oxide may serve as a support. The average diameter of the primary particles (PP) of the amorphous oxide may be, for example, 2 nm to 50 nm. The specific surface area of the amorphous oxide may be, for example, 40 m ² /g to 500 m ² /g.

Silica (SiO ₂ ) according to embodiments of the present invention may be amorphous silicon dioxide, and may include, for example, fumed silica (FS). Fumed silica may be in the form of a white powder when present alone. Fumed silica may have hydrophilic properties. Thus, fumed silica can be miscible with other compounds in aqueous solution. For example, the average diameter of the primary particles (PP) constituting the fumed silica may be, for example, 2 nm to 50 nm, and the specific surface area of the fumed silica may be, for example, 40 m ² /g to 500 m ² It can be /g. Fumed silica may be formed by hydrolysis of chlorosilane in a flame of 1,000 ° C. or higher formed from oxygen and hydrogen. The fumed silica may be connected to each other due to collisions between the primary particles PP formed in the flame to form an aggregate AG. The size of the aggregate (AG) may be, for example, 1 μm to 500 μm. Unlike crystalline silica, even if amorphous silica (SiO ₂ ) is ingested, it is hardly absorbed and mostly excreted from the digestive tract, so amorphous silica does not affect the human body and is harmless with low toxicity. material is known.

According to the present invention, by using an aqueous dispersion of an amorphous oxide having a three-dimensional three-dimensional structure as a coolant, a three-dimensional structure formed by hydrogen bonds between aggregates (AG) and/or Van der Waals force is formed. Water molecules can be trapped in the three-dimensional framework.

Accordingly, when the coolant composition CC freezes, it can provide cool air for a long time. In addition, in terms of thermal conductivity, it may be effective to maintain the existing temperature since heat transfer is not smooth due to the interface between the aggregates AG due to the three-dimensional structure.

Based on the total weight of the coolant composition (CC), the content of the amorphous oxide may be, for example, 0.1 wt% to 18 wt%. When the content of the amorphous oxide is less than 0.1 wt%, the viscosity of the coolant composition (CC) is not sufficiently secured, and thus the shape of the cold pack (CP) may be easily deformed. When the content of the amorphous oxide exceeds 18 wt%, the amorphous oxide may not be uniformly mixed, and energy that can be stored per unit mass may decrease, resulting in deterioration in cooling performance.

The binary ionic compound according to embodiments of the present invention may include at least one selected from alkali metal salts, alkali metal hydroxides, alkaline earth metal salts, alkaline earth metal hydroxides, carbonates, and hydrogen carbonates. In some embodiments, the binary ionic compound may include, for example, at least one of sodium hydroxide (NaOH) and sodium chloride (NaCl). In some embodiments, the binary ionic compound may include, for example, sodium hydroxide (NaOH) and sodium chloride (NaCl). The two-component ion-binding compound may serve to adjust the pH of the coolant composition (CC), bind components in the coolant composition (CC) and promote gelation. Accordingly, the binary ion-binding compound can stabilize the phase of an aqueous solution containing an amorphous oxide.

Based on the total weight of the coolant composition (CC), the content of the binary ionic bond compound may be, for example, 0.01 wt% to 7 wt%. When the content of the two-component ion-binding compound is less than 0.01 wt%, the pH of the aqueous solution is lowered so that the phase of the aqueous solution of the coolant composition (CC) may become unstable, and the bonding strength and gelation degree between the components may not be sufficient. When the content of the two-component ionic compound exceeds 7 wt%, the viscosity of the coolant composition (CC) is unnecessarily high, and thus the coolant performance may deteriorate.

Water according to embodiments of the present invention may serve as a solvent for uniformly dispersing the amorphous oxide and the binary ionic compound. Water may be, for example, at least one of deionized water, pure water, ultrapure water, distilled water, tap water, RO water, and industrial water. The amount of water may be, for example, a residual amount that satisfies 100% by weight of the coolant composition (CC).

The pH of the coolant composition (CC) according to embodiments of the present invention may be, for example, 5.5 to 8.5. The viscosity of the coolant composition (CC) according to embodiments of the present invention may be, for example, 200 cps to 10,000 cps.

The coolant composition (CC) according to embodiments of the present invention may not contain polymers and organic compounds. For example, the coolant composition (CC) may not include a super absorbent polymer (SAP). As another example, the coolant composition (CC) may not include microplastics. In some embodiments, the total organic carbon (TOC) of the coolant composition (CC) may be, for example, 0 ppm to 1 ppm. In the present specification, that the total organic carbon (TOC) is 0 ppm means that no organic carbon exists in the coolant composition (CC), or a very small amount of organic carbon that is not detected by a device for measuring the total organic carbon (TOC). It can mean including.

According to the present invention, the coolant composition (CC) may not include a superabsorbent polymer (SAP) classified as microplastic, and the total organic carbon content (TOC) of the coolant composition (CC) may be 0 ppm to 1 ppm. Accordingly, since the coolant composition (CC) of the present invention is harmless to marine organisms, it may have eco-friendliness capable of being discharged. Therefore, it can satisfy the environmental standards for the amount of pH, TOC, and / or suspended solids (SS), which are gradually being strengthened, so that it does not cause environmental pollution problems and solves the problem of charges that occur during disposal. A coolant composition (CC) can be provided.

In addition, unlike general coolant compositions containing a superabsorbent polymer (SAP) as a main component, the coolant composition (CC) according to the present invention can maintain a stable dispersion state in an aqueous solution. Accordingly, it is possible to prevent bacterial propagation or contamination of stored goods without a separate preservative, and long-term storage properties can be secured.

The packaging material (PM) according to the present invention can seal the coolant composition (CC). The packaging material (PM) may include, for example, at least one selected from the group consisting of polyethylene (PE), linear low-density polyethylene (LLDPE), polypropylene (PP), polyvinyl chloride (PVC), and polyethylene terephthalate (PET). can The packaging material PM may be a thin film. Accordingly, the weight of the cold pack CP can be reduced and the production cost can be reduced.

<Example 1 and Comparative Example 1>

Example 1

A three-dimensional silica (SiO ₂ ) aqueous dispersion, sodium hydroxide (NaOH), and sodium chloride (NaCl) were added and stirred to prepare a coolant composition (pH 7) according to Example 1. The content of silica in the coolant composition of Example 1 was 5 wt%, and the content of sodium chloride (NaCl) was 1 wt%. Sodium hydroxide (NaOH) was added until the pH of the coolant composition reached 7.

Comparative Example 1

Deionized water from which all ions have been removed, which is used as an existing coolant, was used as a coolant.

<Experimental example>

Cold retention evaluation

The experiment was conducted using the ISTA 7D Summer Profile, which evaluates the influence of external temperature exposure. After taking 0.5 kg each of the coolant composition according to Example 1 and Comparative Example 1, it was cooled at -18 ° C for 72 hours. In the temperature and humidity control chamber, the time for each of the cooled coolant compositions to reach 3 ° C was measured, and the results are shown in Table 1 below.

	Example 1	Comparative Example 1
Time to reach 0 ℃	9 hours 28 minutes	8 hours 48 minutes
Time to reach 3℃	9 hours 42 minutes	9 hours 27 minutes
Viscosity (cps)	305.9	One
Total organic carbon, TOC (ppm)	< 1	< 1

As can be seen from Table 1, it was confirmed that the cooling agent composition according to Example 1 can secure the same level of cooling performance as or higher than that of a commercially available water cooling agent (Comparative Example 1).

In addition, as shown in Table 1, the coolant composition according to Example 1 did not contain a separate organic compound as in Comparative Example 1, and TOC (Total organic carbon) was measured to be less than 1 ppm.

In addition, the viscosity of the coolant composition according to Example 1 was measured to be higher than that of Comparative Example 1. As the coolant composition of Example 1 had a certain viscosity, it was confirmed that long-term storage properties could be secured by maintaining a stable dispersion state at room temperature.

Although the embodiments of the present invention have been described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. . Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (16)

1. amorphous oxide;

   binary ionic compounds; and

   In the coolant composition containing water,

   The total organic carbon (TOC) of the coolant composition is 0 ppm to 1 ppm coolant composition.
2. According to claim 1,

   The amorphous oxide is a coolant composition comprising at least one of an amorphous transition metal oxide, an amorphous post-transition metal oxide, and an amorphous metalloid oxide.
3. According to claim 1,

   The amorphous oxide is a coolant composition comprising at least one selected from titania (TiO ₂ ), alumina (Al ₂ O ₃ ), silica (SiO ₂ ), and zirconia (ZrO ₂ ).
4. According to claim 1,

   The amorphous oxide is a coolant composition comprising at least two selected from titania (TiO ₂ ), alumina (Al ₂ O ₃ ), silica (SiO ₂ ), and zirconia (ZrO ₂ ).
5. According to claim 1,

   The amorphous oxide includes an amorphous metal oxide and an amorphous metalloid oxide,

   The amorphous metal oxide includes at least one selected from titania (TiO ₂ ), alumina (Al ₂ O ₃ ), and zirconia (ZrO ₂ ),

   The amorphous metalloid oxide is a coolant composition containing silica (SiO ₂ ).
6. According to claim 5,

   The silica (SiO ₂ ) is a fumed silica (Fumed Silica, FS) coolant composition.
7. According to claim 1,

   The coolant composition is a coolant composition that does not contain polymers and organic compounds.
8. According to claim 1,

   The amorphous oxide includes an aggregate formed by connecting primary particles,

   The aggregate is a coolant composition having a three-dimensional three-dimensional structure.
9. According to claim 8,

   The average diameter of the primary particles of the amorphous oxide is 2 nm to 50 nm,

   The specific surface area of the amorphous oxide is 40 m ² /g to 500 m ² /g coolant composition.
10. According to claim 1,

    The binary ionic compound is a coolant composition comprising at least one selected from alkali metal salts, alkali metal hydroxides, alkaline earth metal salts, alkaline earth metal hydroxides, carbonates, and hydrogen carbonates.
11. According to claim 1,

    The binary ionic compound is a coolant composition containing at least one of sodium hydroxide (NaOH) and sodium chloride (NaCl).
12. According to claim 1,

    Based on the total weight of the coolant composition,

    The content of the amorphous oxide is 0.1 wt% to 18 wt%,

    The content of the two-component ionic bond compound is 0.01 wt% to 7 wt% of the coolant composition.
13. According to claim 1,

    The pH of the coolant composition is 5.5 to 8.5 coolant composition.
14. According to claim 1,

    The viscosity of the coolant composition is 200 cps to 10,000 cps coolant composition.
15. The coolant composition according to any one of claims 1 to 14; and

    A cold pack containing a packaging material for sealing the coolant composition.
16. According to claim 15,

    The packaging material is a cold pack containing at least one selected from the group consisting of PE (polyethylene), LLDPE (linear low-density polyethylene), PP (polypropylene), PVC (polyvinyl chloride), and PET (polyethylene terephthalate).

Images