阅读说明：本技术 一种丙二醇型载冷液 (Propylene glycol type cold carrier liquid ) 是由 冯会良 张春辉 耿立波 杨兵 于 2018-07-09 设计创作，主要内容包括：本发明提供了一种丙二醇型载冷液,其包含如下重量百分含量的成分：丙二醇30～50％、植酸钠0.5～5％、苯甲酸钠0.1～1.5％、麦芽糊精0.1～0.5％,余量去离子水。本发明丙二醇型载冷液用于食品工业二级换热系统,具有安全无毒、挥发性低,能够为食品工业制冷系统中钢、铁、紫铜、黄铜、铸铝、焊锡等金属提供优异的防腐蚀保护。(The invention provides a propylene glycol type cold carrier liquid, which comprises the following components in percentage by weight: 30-50% of propylene glycol, 0.5-5% of sodium phytate, 0.1-1.5% of sodium benzoate, 0.1-0.5% of maltodextrin and the balance of deionized water. The propylene glycol type cooling liquid is used for a secondary heat exchange system in the food industry, is safe, non-toxic and low in volatility, and can provide excellent anti-corrosion protection for metals such as steel, iron, red copper, brass, cast aluminum, soldering tin and the like in a refrigeration system in the food industry.)

1. The propylene glycol type cold carrier liquid is characterized by comprising the following components in parts by weight:

2. the propylene glycol type coolant carrier according to claim 1, comprising the following components in parts by weight:

3. the propylene glycol type coolant carrier according to claim 1 or 2, further comprising a suitable amount of deionized water; preferably with deionized water to make up to a total of 100 parts.

4. The propylene glycol type cooling carrier fluid according to claim 1 or 2, which comprises the following components in percentage by weight:

5. the propylene glycol type cooling carrier fluid according to claim 1 or 2, which comprises the following components in percentage by weight:

6. the propylene glycol type coolant carrier fluid according to claim 1, which is characterized by comprising the following components in percentage by weight:

or the propylene glycol type cold carrier liquid consists of the following components in percentage by weight:

or the propylene glycol type cold carrier liquid consists of the following components in percentage by weight:

or the propylene glycol type cold carrier liquid consists of the following components in percentage by weight:

7. a process for the preparation of a propylene glycol-based coolant carrier according to any one of claims 1 to 6, comprising the steps of:

1) adding propylene glycol and water according to the formula ratio into a reaction kettle, stirring and heating to 50-60 ℃;

2) adding sodium phytate, sodium benzoate and maltodextrin in formula amount into a reaction kettle, and stirring until the sodium phytate, the sodium benzoate and the maltodextrin are completely dissolved.

Technical Field

The invention relates to a propylene glycol type cold carrier liquid, and belongs to the field of fine chemicals.

Background

The cold carrying liquid is used for transferring the heat of an object to be cooled to an evaporating refrigerant in a refrigerating device working in an indirect cooling mode, the cold carrying liquid is often used for cooling the object to be cooled by replacing a direct refrigerant in a position where the direct refrigerant is not easy to apply or in a special environment where the direct refrigerant cannot be used, and the high-quality cold carrying liquid generally has the characteristics of low freezing point, low viscosity, large specific heat, safety, no toxicity, high thermal conductivity and good corrosion resistance.

The cold carrying liquid for the food industry is widely applied to various links of food production, storage and sale, such as temperature control, a secondary refrigeration house refrigerating system, a secondary cooling system of a large supermarket and the like in food processing, and the non-toxic and low-toxicity cold carrying liquid is preferred for the food industry.

The common cold-carrying liquid comprises ethanol, ethylene glycol and propylene glycol aqueous solution, calcium chloride and sodium chloride aqueous solution, the ethanol cold-carrying liquid has low flash point, is inflammable and explosive, has strong volatility, seriously corrodes metal equipment, the calcium chloride and sodium chloride aqueous solution greatly corrodes the equipment, corrosion control is difficult to be carried out by adding a corrosion inhibitor, the ethylene glycol and the propylene glycol have stable properties and are miscible with water, the aqueous solution of the ethylene glycol and the propylene glycol is usually used as the cold-carrying liquid, the ethylene glycol cold-carrying liquid has the advantages of low freezing point, high boiling point, high flash point and the like, and the propylene glycol cold-carrying liquid has low toxicity compared with the ethylene glycol cold-carrying liquid, and can better meet the requirements of the food industry.

Disclosure of Invention

The invention aims to provide a propylene glycol type cooling liquid, which adopts an environment-friendly non-toxic corrosion inhibitor, can be widely applied to a secondary cooling system in the food industry and avoids pollution caused by leakage.

In order to realize the purpose of the invention, the invention provides a propylene glycol type cooling carrier liquid, which comprises the following components in parts by weight:

preferably, the propylene glycol type cooling carrier liquid comprises the following components in parts by weight:

furthermore, the propylene glycol type cold carrier liquid also comprises a proper amount of deionized water; preferably with deionized water to make up to a total of 100 parts.

The preferred technical scheme of the invention is as follows: the propylene glycol type cooling carrier liquid comprises the following components in percentage by weight based on 100 percent of weight:

the best technical scheme of the invention is as follows: the propylene glycol type cooling carrier liquid comprises the following components in percentage by weight based on 100 percent of weight:

the invention also provides a preparation method of the propylene glycol type refrigerating fluid, which comprises the following steps:

1) adding propylene glycol and water according to the formula ratio into a reaction kettle, stirring and heating to 50-60 ℃;

2) adding sodium phytate, sodium benzoate and maltodextrin in formula amount into a reaction kettle, and stirring until the sodium phytate, the sodium benzoate and the maltodextrin are completely dissolved.

Further, it is to be understood that terms such as "comprising," "including," "containing," and the like, also include "consisting of … …," "consisting of … …," "made of … …," and the like, herein.

All percentages stated in the present invention are by weight unless otherwise specified.

The starting materials of the present invention are commercially available or can be prepared by methods conventional in the art.

The propylene glycol is used as the antifreeze agent of the cold-carrying liquid, so that the freezing point of the cold-carrying liquid is effectively reduced, the boiling point of the cold-carrying liquid is improved, and the LD of the propylene glycol₅₀The value (median lethal dose) is 28000, and the product is an actual nontoxic substance.

The sodium phytate is a pure natural green additive, is rich in carboxyl and hydroxyl, has the properties of ion exchange, adsorption, complexation and the like and good dispersibility, can effectively disperse metal oxides, forms a chemically stable protective film on the surface of metal, shows good scale inhibition, scale dissolution and corrosion inhibition performances, and can effectively prevent the corrosion of metal equipment.

The sodium benzoate is a common ferrous metal corrosion inhibitor, enhances the protection effect of the cooling liquid on steel and cast iron, and also has a certain sterilization effect.

The maltodextrin is also called water-soluble dextrin or enzyme method dextrin, is prepared by using starch corn, rice and the like as raw materials and performing low-degree controlled hydrolysis conversion, purification and drying through an enzyme method process, has no toxicity, good stability and corrosion inhibition performance, and prolongs the service lives of cold-carrying liquid and heat exchange equipment.

The propylene glycol type cold carrier liquid can be prepared by adopting a conventional method in the field, and can be prepared by mixing the components according to the proportion and uniformly stirring.

Compared with the prior art, the propylene glycol type cold carrier liquid has the following advantages and effects:

1. all the raw materials are safe and nontoxic, and the cold-carrying liquid is nontoxic.

2. The glassware corrosion test shows that the cooling liquid has excellent multi-metal protection performance.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.