JPS5811577A - Freezing retarder - Google Patents

Abstract

PURPOSE:The titled composition having a freezing retarding effect, obtained by adding a specific copolymer and a surface active agent to a neutral inorganic salt, stabilizing supercooling state. CONSTITUTION:A neutral inorganic salt (e.g., rock salt, etc.) is blended with a small amount of one or more of (A) a copolymer of an alkylene and a carboxylic acid (e.g., polyethylene terephthalate, etc.), (B) surface active agent, preferably anionic surface active agent (e.g., sodium dioctyl sulfosuccinate, etc.), (C) alcohol sulfate (e.g., sodium lauryl sulfate, etc.), (D) sodium sesquicarbonate, and (E) copolymer of polyacrylic acid and polycarboxylic acid (e.g., Simika gel, etc.) to give the desired composition. USE:Freezing prevention for soil during engineering work, freezing prevention for road surface in winter, and freezing retardation for refrigerant and freezing medium.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel freeze-delaying agent for stabilizing the supercooled state and delaying freezing by allowing the product to remain unfrozen for a long time.

Generally, the moisture contained in ±1 will freeze in a short period of time if it is exposed to sub-zero temperatures. To prevent this moisture from freezing, anti-freezing agents such as table salt and calcium chloride are used. However, for a while, a supercooling phenomenon occurs, and the temperature drops without freezing. In other words, although it remains in a liquid state for a while without freezing, it eventually freezes and civil engineering work may have to be stopped.

This type of problem can also occur when these salts are used as cryogens, etc., or when used in cooled chemical plants, etc., and when these salts are used as anti-icing agents on road surfaces in winter, they are spread with material spreaders, etc. Even in this case, if the temperature drops, it will eventually freeze as described above, and the intended purpose will often not be achieved.

The present invention was made to solve all of these drawbacks, and as a result of intensive research, the addition of certain copolymers and surfactants to neutral inorganic salts stabilized the supercooled state. It was discovered that it has a freezing delaying effect that allows it to remain unfrozen for a long time.Based on this new knowledge, further research led to the completion of the present invention.

That is, the present invention comprises adding and mixing one or more of the following: a copolymer of γ, an alkyl sulfate, a sulfosuccinate, and a sodium sesquicarbonate to a neutral inorganic salt. It is a moisture freezing retardant characterized by the following.

In the present invention, a small amount of one or more of the following substances is added to and mixed with neutral inorganic salts in order to prevent freezing temperatures: (1) Alkylene and carboxylic acid copolymer block copolymer, graft Any copolymer can be used, and as the alkylene moiety, any copolymer can be used as long as it has a polymerizable double bond. Polyolefin polymers such as polyethylene and polypropylene are particularly suitable; As the acid moiety, any material having a polymerizable carbonyl group can be used, including polyesters of aromatic dicarboxylic acids and diols, polyesters of diphenol and dicarboxylic acids, polyesters of terephthalic acid and diols, and resins. Various polyesters such as polyesters made from cyclic compounds and self-condensing polyesters of oxycarboxylic acids can be widely used.

Particularly preferred are polyethylene tele 7 talate, such as Toshi's Tetron, DuPont's My 2-, Declon, Claraine Prec Mical's Inpan 110,1.
0410.06.04, GH, GHF, etc.

(2) Surfactants: Various anionic, cationic, amphoteric, and nonionic surfactants, including synthetic and natural ones, can be widely used; however, only ionic surfactants can be used. For example, alkyl sulfates (eg, octyl, dodecyl, sodium decyl sulfates), sulfosuccinates (eg, dialkyl sulfosuccinates, octyl sodium) are suitable.

(3) Alcohol sulfate: Examples include Sunol LDF and Sunol LL105, which are sodium lacryl sulfate manufactured by Lion.

(4) Sodium sesquicarbonate.

(5) Copolymers of polyacrylic acid and polycarboxylic acid, such as Aqua Keep, Hoka Sumikadal, and Mitsubishi Kasei Sunwet manufactured by Seitetsu Kagaku.

As neutral inorganic salts to which these substances are added and mixed, rock salt: table salt, calcium chloride, magnesium chloride, ammonium chloride, sodium nitrate, sodium sulfate, etc. can be widely used, and other neutral inorganic salts can also be used. Any salts can be used as long as they do not react with the above-mentioned additives and do not adversely affect the freezing delay.

The freeze retardant thus prepared can be used as is, but it can be used in various oMIs using a binder or binder.
JVcH may be formulated to make it easier to use and handle. The dosage form can be in the form of powder, granules, tablets, pills, or small spheres; for example, it may be granulated by adding a small amount of carboxymethyl cellulose, polyvinyl alcohol, etc. as a binder. This makes it easier to disperse.

The freezing retardant according to the present invention is prepared as described above, and if it is distributed over the soil during a severe cold period, freezing of the soil will be prevented for a long time (for example, 20 hours at -5°C), and therefore Necessary civil engineering work can be carried out during this time, and construction progresses smoothly even during the coldest months. In addition, if you spray this on the road surface in winter, it will prevent anti-slip materials such as table salt, salt calc, and salt mugs from freezing for a long time, which will provide a great advantage for road traffic. Especially when sand and crushed stone are used in combination, a particularly excellent freezing delay effect can be obtained. Furthermore, in the chemical industry, when these inorganic salts are used together with ice as a refrigerant or cryogen, they can delay freezing and maintain a liquid state for a long period of time, making it possible to freeze chemical plants. Blockage troubles can be prevented, and processing operations and efficiency can be further improved.

Next, examples of the present invention will be shown.

Example 1 To 55 parts by weight of Isopan 110 manufactured by Kuhn Implen Cumical, which is a copolymer of alkylene and carboxylic acid, 56.5 parts of sodium sesquicarbonate T3 and 56.5 parts of alcohol sulfate were added, and 3 parts of water were added. 0.6 parts of carboxymethyl cellulose as a binder is added to the mixture, granulated into granules, and then dehydrated and dried to obtain granulated powder.

Take 0.05 parts of the obtained granulated powder, add 15 parts of food, and dissolve it in 95 parts of water. Using the resulting solution, the water content is 1.
Dry sand so that it becomes 0.
: 100II). When I lowered the temperature to -5℃, it remained frozen for about 20 hours.

As a control, water-containing sand without the above-mentioned granulated powder was frozen in 15 to 4 hours at a temperature of -5°C.

Example 2 Even when each component was processed and blended in the same manner as in Example 1 without using a binder, excellent results similar to those described above were obtained.

Agent Patent Attorney 1) Parent Male

Claims (1)

[Claims] Neutral inorganic salts, alkylene and carboxylic acid copolymers,
A water freeze retardant, which is prepared by adding and mixing one or more of alcohol sulfate, alkyl sulfate, sulfosuccinate, sodium sesquicarbonate, sodium polyacrylate, and polycarboxylic acid.