KR20100019083A

KR20100019083A - Cold-storage material and ice-pack

Info

Publication number: KR20100019083A
Application number: KR1020080077933A
Authority: KR
Inventors: 김호칠
Original assignee: 김호칠
Priority date: 2008-08-08
Filing date: 2008-08-08
Publication date: 2010-02-18

Abstract

The present invention relates to a coolant capable of keeping foods and beverages at a low temperature for a long time by lowering the freezing point while maintaining a cold effect and excellent freezing safety, and specifically, by absorbing ethyl alcohol and water in a super absorbent resin. It is related with the coolant characterized by the above-mentioned.

Description

COLD-STORAGE MATERIAL AND ICE-PACK}

Super Absorbent Polymer (SAP) is a polymer material that can absorb and retain water of several hundred times to one thousand times its own weight. When water is added, it swells to form a hydrogel. This hydrated gel has a feature that water is not easily released even under pressure from the outside.

In order to keep the inside of a closed container at a low temperature for a certain period of time, ice or dry ice may be used to preserve cold air, or recently, a coolant is used. However, the superabsorbent resin is used as an important component in the coolant.

On the other hand, the online shopping market has continued to grow more than 30% annually in recent years despite the growth of department stores and convenience stores.

In addition, commodities such as food are frequently damaged by delays in delivery times due to traffic jams, which are frequently caused by an increase in delivery volume and an increase in traffic volume. Accordingly, ice packs using a coolant are packaged together with foods for delivery, but there is a limit to maintaining food freshness for a long time.

In addition, in the case of conventional ice packs, the safety of freezing is not good, and the surface of the coolant is frozen when frozen, and there is a problem that often breaks the pack of the ice pack as a packaging material.

The present invention for solving such a conventional problem is to maintain the cold effect, while lowering the freezing point and excellent freezing safety to keep food, beverages and the like at a low temperature for a long time, even in the case of long-distance, long-distance delivery The purpose is to provide a coolant that can be kept in a state.

The present invention for achieving the above object provides a coolant having improved cold storage and freezing safety, characterized in that made by absorbing ethyl alcohol and water in a super absorbent resin.

In particular, it is preferable to absorb 1-15 parts by volume of the ethyl alcohol with respect to 100 parts by volume of water in the super absorbent polymer.

In addition, the present invention provides an ice pack characterized in that the coolant is accommodated in the pack.

Hereinafter, the coolant of the present invention will be described in detail.

The coolant of the present invention is made by absorbing ethyl alcohol and water into a super absorbent polymer.

The superabsorbent resin is to absorb the ethyl alcohol and water to exert the cold effect, but may be used starch-based, synthetic resins, cellulose-based resins, etc., but is not greatly limited, generally, PSA (poly sodium acrylate) use.

And the amount of water is determined according to the absorption capacity of the super absorbent polymer, and is not limited to a large amount.

Ethyl alcohol lowers the freezing point of the coolant without compromising the cold storage effect, and also freezes the surface of the ice pack smoothly without freezing when freezing. Can be.

In particular, the ethyl alcohol is preferably used 1 to 15 parts by volume with respect to 100 parts by volume of water. When ethyl alcohol is used in less than 1 part by volume, the freezing point drop effect is insignificant, and when used in excess of 15 parts by volume, the manufacturing cost increases, and there is a problem that the cold storage property is lowered.

In addition, the present invention provides an ice pack containing the coolant in a pack.

Cooling agent of the present invention can lower the freezing point while maintaining the cooling effect and excellent freezing safety as well as harmless to the human body can keep food, beverages, etc. for a long time at a low temperature, keep food, beverages, etc. for a long time Since it can be made, there is an effect that can be widely used in long-distance delivery such as courier.

Hereinafter, the coolant of the present invention will be described in more detail with reference to Examples. The scope of the present invention is not limited to the following Examples.

[Examples 1-5]

10 to 200 ml of ethyl alcohol was added to 10 ml units in 1000 ml of water, and then absorbed into 8 g of PSA (poly sodium acrylate), a super absorbent polymer of K company, to prepare the coolant of Examples 1 to 18. And the prepared coolant was put into each pack and sealed to obtain an ice pack.

Comparative Example 1

As Comparative Example 1, a gelled ice pack obtained by absorbing water into a super absorbent polymer was commercially available.

The ice packs of Examples 1 to 18 and the ice packs of Comparative Example 1 prepared as described above were put into a freezer at -20 ° C and frozen and frozen for 24 hours. The degree of freezing, freezing stability, freezing point and temperature change over time were measured, and the measurement results are shown in Table 1.

The degree of freezing was evaluated as "strong", "medium", "weak" according to the degree of freezing, and the freezing stability was "○" when the surface of the ice pack was rubbed smoothly by hand. When it felt, it evaluated as "(triangle | delta)." The freezing point was determined by measuring the temperature after removing each ice pack from the freezer for 10 minutes in a space of 20 ° C., and the temperature change over time after 1 hour, 6 hours, and 12 hours after being left in a space of 20 ° C. The experiment was carried out by measuring the temperature after 18 hours and 24 hours.

[Table 1] Measurement result of temperature change with freezing degree, freezing stability, freezing point and time

Ethyl Alcohol Content (ml) Freezing degree Freezing stability freezing point Temperature change over time (h) One 6 12 18 24 Example 1 10 River ○ -7 -2 One 0 2 5 Example 2 20 River ○ -8 -3 -2 -One 0 3 Example 3 30 River ○ -10 -7 -5 -4 -3 -One Example 4 40 River ○ -11 -10 -8 -6 -3 -One Example 5 50 River ○ -11 -10 -8 -6 -3 -One Example 6 60 River ○ -12 -10 -9 -6 -3 One Example 7 70 River ○ -12 -10 -10 -7 -4 4 Example 8 80 River ○ -12 -11 -10 -8 -5 5 Example 9 90 River ○ -12 -11 -10 -9 -5 6 Example 10 100 River ○ -13 -12 -10 -9 -3 7 Example 11 110 medium ○ -13 -13 -11 -9 -3 7 Example 12 120 medium ○ -14 -13 -11 -10 -3 8 Example 13 130 medium ○ -14 -13 -12 -10 -One 12 Example 14 140 medium ○ -14 -13 -12 -11 -One 12 Example 15 150 medium ○ -14 -13 -12 -11 -One 12 Example 16 160 about ○ -13 -12 -10 -5 2 13 Example 17 180 about ○ -10 -10 -9 -4 4 13 Example 18 200 about ○ -8 -8 -5 0 5 14 Comparative Example 1 - River △ -5 0 2 5 10 18

As can be seen from the measurement results of Table 1, the conventional ice pack of Comparative Example 1 has a high freezing point of -5 ° C and a temperature change to 5 ° C after 12 hours, which leads to poor cold retention and uneven surface. Although the freezing stability was not good, Examples 1 to 18 not only have excellent freezing stability but also have an excellent freezing point drop effect with a freezing point of -8 ° C or less.

In particular, in the case of Examples 1 to 15 it can be excellent in freezing point drop effect and cold storage.

Claims

Cooling agent with improved cold storage and freezing safety, characterized in that the absorption of ethyl alcohol and water in a super absorbent resin.

The cold storage agent according to claim 1, wherein ethyl alcohol is absorbed from 1 to 15 parts by volume of the superabsorbent polymer with respect to 100 parts by volume of water.

Ice pack characterized in that the coolant of claim 1 or 2 contained in the pack.