CN103897665A - Long-acting low-temperature phase-change cool-storage material, and preparation method thereof - Google Patents

Abstract

The invention discloses a long-acting low-temperature phase-change cool-storage material, and a preparation method thereof. The long-acting low-temperature phase-change cool-storage material is composed of, by weight, 10 to 15% of ammonium chloride, 5 to 10% of sodium nitrate, 1 to 5% of sodium phosphate, 10 to 20% of n-dodecane, 10 to 15% of n-decane, 5 to 10% of a surfactant, and the balance water. The preparation method comprises following steps: (a) ammonium chloride, sodium nitrate, and sodium phosphate are dissolved in water, and an obtain mixture liquid is stirred so as to realize complete dissolving; (b) n-dodecane, n-decane, and the surfactant are mixed, and an obtained mixed solution is stirred to be uniform; (c) the mixture liquid is mixed with the mixed solution, and an obtained product is stirred to be uniform. Solidification temperature of the long-acting low-temperature phase-change cool-storage material ranges from -30 to -12 DEG C, phase change latent heat ranges from 300 to 340J/g, and long-term refrigeration can be realized.

Description

A kind of long-acting low temperature phase change cold storage material and preparation method thereof

Technical field

The present invention relates to a kind of cool storage material and preparation method thereof, particularly a kind of long-acting low temperature phase change cold storage material and preparation method thereof.

Background technology

In daily life, often run into and need long distance to preserve the situation of cryogenic freezing article.In normal circumstances, people can meet this demand with dry ice.But there is following drawback in dry ice: can not recycle; Use encloses container to preserve and may cause explosion hazard; Manufacturing technology is special, and manufacturing cost is higher; Dry ice gasification temperature is too low, and misoperation can cause that personnel injure etc.

In order to overcome the above problems, phase-change material for cold storage arises at the historic moment, and its principle of work is to utilize working medium from a kind of another kind of in opposite directions process changing mutually, can absorb in a large number the phenomenons of heats, carries out energy storage and transfer.In real operation, only have can meet that energy storage capacity is large, releasing can be slowly, stable performance, low toxicity is pollution-free, can Reusability etc. the material of condition, could generally be accepted and be used.For example eutectic salts and paraffinic hydrocarbon are all conventional cold storage agent, but respectively have relative merits: eutectic salts working range is adjustable, easy to use, but latent heat of phase change value is lower, has surfusion when phase transformation is solidified; Paraffinic hydrocarbon stable in properties, latent heat of phase change value are relatively high, but working temperature is single, use inconvenience.

Summary of the invention

The object of this invention is to provide a kind of long-acting low temperature phase change cold storage material, to solve the above-mentioned problems in the prior art.

Another object of the present invention is to provide a kind of preparation method of above-mentioned composition.

Long-acting low temperature phase change cold storage material of the present invention, this material is composed of the following components by weight percentage:

In above-mentioned phase-change material for cold storage, ammonium chloride and SODIUMNITRATE are the main components in the aqueous solution, for reducing the freezing point of water; Sodium phosphate is the anti-cryogen of crossing; N-decane and n-dodecane are the chief component of organic phase; Tensio-active agent be used for making organic phase with micelle or (with) form of micro emulsion is scattered in water, or water with micelle or (with) form of micro emulsion is scattered in organic phase.

In above-mentioned phase-change material for cold storage, tensio-active agent used is selected from one or more in the smooth or polysorbate of Sodium dodecylbenzene sulfonate, quaternary ammonium compound, Yelkin TTS, lipid acid sorb.

The method of preparing above-mentioned phase-change material for cold storage is made up of following steps successively:

(a) ammonium chloride, SODIUMNITRATE, sodium phosphate is soluble in water, be stirred to completely and dissolve;

(b) n-dodecane, n-decane are mixed with tensio-active agent, be stirred to evenly;

(c), by the liquid mixing obtaining in two steps of (a) and (b), be stirred to evenly.

The present invention selects ammonium chloride, sodium nitrate aqueous solution and n-dodecane, n-decane as raw material, by adding certain proportion tensio-active agent, make organic phase with micelle or (with) form of micro emulsion is scattered in water; Or water with micelle or (with) form of micro emulsion is scattered in organic phase.The mixture coagulates point of n-dodecane and n-decane is-15 ℃ of left and right, and the zero pour of the aqueous solution is-30～-15 ℃, in the time that the aqueous solution starts to melt heat absorption, n-dodecane is all the time in curdled appearance like this, finish when the aqueous solution melts, n-dodecane continues to start to melt and a large amount of heat that absorbs.

The invention has the beneficial effects as follows: this phase-change material for cold storage has wider solidification temperature range and larger latent heat of phase change, and long refrigeration can be provided.Working medium because relying on tensio-active agent, paraffinic hydrocarbon solution is connected with water molecules, therefore there will not be obvious phase-separated state in whole working process.

Embodiment

Now in conjunction with specific embodiments, the present invention is further detailed explanation.

Embodiment 1

At normal temperatures and pressures, just ammonium chloride, SODIUMNITRATE, sodium phosphate are soluble in water to press respectively in table 1 each component of specifying, and stir 30 minutes with 5000r/min; N-dodecane, n-decane are mixed with Sodium dodecylbenzene sulfonate, stir 1 hour with 5000r/min; Again the water of gained in above-mentioned two steps and organic phase are mixed, and stir 2 hours with 5000r/min.Then test transformation temperature and the latent heat of phase change of gained phase-change material for cold storage, in table 1, listed test result.

The present invention has also carried out further experiment to the phase-change material for cold storage obtaining by said ratio, adopts commercially available common 26L insulation can, and thermal insulation layer is the polyurethane foam of thickness 2cm.At constant 18 ℃ of room temperature, in this insulation can, place the phase-change material for cold storage that 5kg obtains by said ratio, from abundant cold-storage to melting completely, last 154 hours.

Embodiment 2

Each component concentration of pressing appointment in table 1 repeats the method for embodiment 1, but with sorbester p17 (sorbitan mono-oleic acid ester) replacement Sodium dodecylbenzene sulfonate, test result is listed in table 1.

Embodiment 3

Each component concentration of pressing appointment in table 1 repeats the method for embodiment 1, but with the mixture replacement Sodium dodecylbenzene sulfonate of the weight ratio 1:1 of tween 80 (polyoxyethylene sorbitan monooleate) and Yelkin TTS, test result is listed in table 1.

Table 1

Claims (3)

1. a long-acting low temperature phase change cold storage material, this material is composed of the following components by weight percentage:

。

2. long-acting low temperature phase change cold storage material as claimed in claim 1, it is characterized in that, described tensio-active agent is selected from one or more in Sodium dodecylbenzene sulfonate, quaternary ammonium compound, Yelkin TTS, sorbitan fatty acid ester or polyoxyethylene sorbitan fatty acid ester.

3. prepare a method for long-acting low temperature phase change cold storage material as claimed in claim 1, it is characterized in that the method is made up of following steps:

(a) ammonium chloride, SODIUMNITRATE, sodium phosphate is soluble in water, be stirred to completely and dissolve;

(b) n-dodecane, n-decane are mixed with tensio-active agent, be stirred to evenly;

(c), by the liquid mixing obtaining in two steps of (a) and (b), be stirred to evenly.