阅读说明：本技术 一种应用于冷藏运输的保温袋及其制备方法 (Thermal insulation bag applied to refrigeration transportation and preparation method thereof ) 是由 高广利 于 2020-04-16 设计创作，主要内容包括：本发明适用于材料技术领域,提供了一种应用于冷藏运输的保温袋及其制备方法,该保温袋的外包装袋采用可生物降解材料制备而成,绿色环保、无毒、无害；并采用由氯化钠溶液、吸水树脂、相变蜡或聚丙烯酸钠组成的三元或者四元复合物组成相变储能材料,该相变储能材料采用的原料来源广泛,成本低,且复配成的三元或四元复合物具有优异的相变储热性能,蓄冷效果好且持久,可多次重复利用,重复利用率高,十分适用于对温度敏感的货物的冷藏长途运输,降低了此类货物在冷藏运输过程中因发生劣变。(The invention is suitable for the technical field of materials, and provides a thermal insulation bag applied to refrigeration transportation and a preparation method thereof, wherein the outer packaging bag of the thermal insulation bag is prepared from biodegradable materials, and is green, environment-friendly, nontoxic and harmless; the ternary or quaternary compound composed of sodium chloride solution, water-absorbent resin, phase-change wax or sodium polyacrylate is adopted to form the phase-change energy-storage material, the source of the raw materials adopted by the phase-change energy-storage material is wide, the cost is low, the ternary or quaternary compound compounded by the phase-change energy-storage material has excellent phase-change heat storage performance, the cold storage effect is good and lasting, the ternary or quaternary compound can be repeatedly utilized, the reutilization rate is high, the ternary or quaternary compound is very suitable for the refrigeration long-distance transportation of temperature-sensitive goods, and the deterioration of the goods in the refrigeration transportation process is reduced.)

1. The heat-insulating bag applied to refrigerated transportation is characterized by comprising an outer packaging bag made of biodegradable materials and a phase change energy storage material packaged in the outer packaging bag;

the phase-change energy storage material is a ternary or quaternary compound consisting of a sodium chloride solution, water-absorbing resin and phase-change wax and/or sodium polyacrylate.

2. The thermal bag applied to refrigerated transportation of claim 1, wherein the phase-change energy storage material is a quaternary compound consisting of a sodium chloride solution, a water-absorbent resin, a phase-change wax or sodium polyacrylate.

3. The thermal insulation bag for refrigerated transport according to claim 2, wherein the mixture weight ratio of the four of the sodium chloride solution, the water absorbent resin, the phase-change wax and the sodium polyacrylate is 1: 5-7: 2-3: 1 to 2.

4. The thermal insulation bag for refrigerated transport according to claim 3, wherein the mixing weight ratio of the sodium chloride solution, the water-absorbent resin, the phase-change wax and the sodium polyacrylate is 1:5:2: 1.

5. the thermal bag for refrigerated transport of claim 1 wherein the concentration of the sodium chloride solution is 0.1% to 0.2%.

6. The thermal insulation bag for refrigerated transport according to claim 1, wherein the water-absorbent resin is a starch-based water-absorbent resin.

7. The thermal bag for refrigerated transport of claim 1 wherein the biodegradable material comprises the following components in parts by weight:

75-90 parts of polylactic acid, 3-9 parts of nano cellulose and 0.5-10 parts of polyethylene terephthalate.

8. The thermal bag for refrigerated transport according to claim 7, wherein the nanocellulose is prepared by:

adding natural cellulose pulp into a sulfuric acid solution, soaking for 5-10 min, transferring into a constant-temperature water bath kettle, reacting for 90-150 min, taking out, washing with deionized water to be neutral, and drying for 36-48 h to obtain the nano cellulose.

9. The thermal insulation bag applied to refrigerated transportation according to claim 7, wherein the mixing weight ratio of the natural cellulose pulp to the sulfuric acid solution is 1: 9-12.

10. The method for preparing the thermal insulation bag for refrigerated transportation according to any one of claims 1 to 9, comprising the following steps:

putting a biodegradable material into a film blowing machine, controlling the film blowing temperature to be 160-180 ℃, extruding and processing into a film, and preparing an outer packaging bag by using the film;

and filling the phase change energy storage material into the outer packaging bag, and sealing to obtain the heat preservation bag applied to refrigeration transportation.

Technical Field

The invention belongs to the technical field of materials, and particularly relates to a thermal insulation bag applied to refrigerated transport and a preparation method thereof.

Background

Cold chain logistics, which is a system engineering for ensuring the quality of goods and reducing the loss of goods, is generally called as low-temperature logistics, and generally refers to the fact that refrigerated and frozen goods (such as food) are always in a specified low-temperature environment in all links before production, storage, transportation and sale and before consumption. The low temperature is the key to guarantee the quality of the goods and reduce the loss of the goods. Due to the constant change of the external environment, such as speed, external temperature, microorganisms, impurities and the like, the transportation process of goods (especially refrigerated transportation) is a link with the highest risk in each link of a cold chain.

The existing refrigerated transportation generally adopts a refrigerated truck with equipment with cold insulation, ventilation and good heat insulation performance for transportation, but due to the influence of various factors such as goods loading and unloading, external environment and the like, the refrigerated truck is often difficult to maintain a required low-temperature environment in the whole transportation process. For some goods that are extremely temperature sensitive, small changes in ambient temperature can cause degradation of the quality of the goods. In order to maintain the goods in a required low-temperature environment during the whole refrigeration transportation process, some ice bags are usually placed in a refrigerator car or a goods packaging container to keep the goods in a low-temperature state, so that the risk of the goods deterioration caused by too large fluctuation range of temperature change in the refrigerator car during the refrigeration transportation process is reduced.

In the prior art, although the use of the ice bag can keep the goods in a low-temperature state to a certain extent, the heat preservation effect of the ice bag is poor in persistence and low in repeated utilization rate, most of the existing ice bag packaging materials are prepared by adopting petroleum-based plastics as raw materials, a large amount of petroleum resources are consumed, sustainable development is not facilitated, a large amount of plastic wastes which are difficult to degrade are generated, and environmental protection is not facilitated.

Disclosure of Invention

The embodiment of the invention provides a heat preservation bag applied to refrigeration transportation, and aims to solve the problems that the existing ice bag is poor in heat preservation effect persistence and low in repeated utilization rate, most of packaging materials are prepared from petroleum-based plastics, and the packaging materials are difficult to degrade and are not beneficial to sustainable development.

The embodiment of the invention is realized in such a way that the thermal insulation bag applied to refrigeration transportation comprises an outer packaging bag made of degradable materials and a phase change energy storage material packaged in the outer packaging bag; the phase-change energy storage material is a ternary or quaternary compound consisting of a sodium chloride solution, water-absorbing resin and phase-change wax and/or sodium polyacrylate.

The embodiment of the invention also provides a preparation method of the heat preservation bag applied to refrigerated transport, which comprises the following steps: putting the degradable material into a film blowing machine, controlling the film blowing temperature to be 160-180 ℃, extruding and processing into a thin film, and preparing an outer packaging bag by using the thin film; and filling the phase change energy storage material into the outer packaging bag, and sealing to obtain the heat preservation bag applied to refrigeration transportation.

The heat-insulating bag applied to refrigerated transportation provided by the embodiment of the invention has the advantages that the outer packaging bag is prepared from biodegradable materials, and is green, environment-friendly, non-toxic and harmless; the ternary or quaternary compound composed of sodium chloride solution, water-absorbent resin, phase-change wax or sodium polyacrylate is adopted to form the phase-change energy storage material, the phase-change energy storage material has wide raw material sources and low cost, the ternary or quaternary compound compounded has excellent phase-change heat storage performance, the cold storage effect is good and durable, the ternary or quaternary compound can be repeatedly utilized, the reutilization rate is high, the phase-change energy storage material is very suitable for the refrigeration long-distance transportation of temperature-sensitive goods, the probability of deterioration of the goods in the refrigeration transportation process is reduced, the loss of the goods is reduced, and therefore the economic loss caused by the reduction of the quality of the goods is reduced.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The heat-insulating bag applied to refrigerated transportation provided by the embodiment of the invention has the advantages that the outer packaging bag is prepared from biodegradable materials, and is green, environment-friendly, non-toxic and harmless; the ternary or quaternary compound composed of sodium chloride solution, water-absorbent resin, phase-change wax or sodium polyacrylate hydrogel is adopted to form the phase-change energy storage material, the phase-change energy storage material has wide source of raw materials and low cost, the ternary or quaternary compound compounded by the phase-change wax or the sodium polyacrylate hydrogel has excellent phase-change heat storage performance, the cold storage effect is good and durable, the ternary or quaternary compound can be repeatedly utilized, the reutilization rate is high, the phase-change energy storage material is very suitable for the refrigeration long-distance transportation of temperature-sensitive goods, the probability of deterioration of the goods in the refrigeration transportation process is reduced, the loss of the goods is reduced, and therefore the economic loss caused by the reduction of the quality of the goods is reduced.

The embodiment of the invention provides a heat-insulating bag applied to refrigeration transportation, which comprises an outer packaging bag made of biodegradable materials and a phase change energy storage material packaged in the outer packaging bag; the phase change energy storage material is a ternary or quaternary compound consisting of a sodium chloride solution, water-absorbent resin, phase change wax or sodium polyacrylate hydrogel.

Preferably, the phase change energy storage material is a quaternary compound consisting of a sodium chloride solution, water-absorbent resin, phase change wax or sodium polyacrylate.

The storage of latent heat of phase change involves the change of phase state of a substance, such as the storage or release of heat realized by the substance during the phase change of solid-solid, solid-liquid, solid-gas or liquid-gas. A substance capable of undergoing any one of the four phase changes described above may be referred to as a phase change material (or phase change energy storage material).

The conventional ice bag adopts water as a phase change material, and enthalpy change can occur in the ice-water (solid-liquid) phase change process, so that heat can be released to the outside or absorbed from the outside. However, due to the high fluidity of water, the shape of the water in the ice bag is difficult to fix when the water is frozen, the edge angle of the ice is easy to puncture the outer packaging bag of the ice bag, the outer packaging bag of the ice bag is damaged, the damaged ice bag is placed in goods, the ice will flow out from the damaged part when the ice is melted into water, and the ice bag without the water can be discarded and cannot be used. In addition, the latent heat of phase change of water is small, the cold storage effect is poor, the duration time is short, and the cold storage effect is not good for refrigerating long-distance transportation of some temperature-sensitive goods.

The ternary or quaternary compound is compounded by adopting the sodium chloride solution, the water-absorbing resin, the phase-change wax or the sodium polyacrylate, the latent heat of phase change of the ternary or quaternary compound compounded by the raw materials is far more than that of water, and the ternary or quaternary compound has good cold storage effect, long duration and repeated utilization, is widely suitable for refrigeration transportation of various goods, for example, is suitable for refrigeration long-distance transportation of some goods sensitive to temperature.

In a preferred embodiment of the present invention, the mixing ratio by weight of the sodium chloride solution, the water absorbent resin, the phase-change wax and the sodium polyacrylate is 1: 5-7: 2-3: 1 to 2.

More preferably, the mixing weight ratio of the sodium chloride solution, the water-absorbing resin, the phase-change wax and the sodium polyacrylate is 1:5:2: 1.

preferably, the concentration of the sodium chloride solution is 0.1-0.2%.

Preferably, the water-absorbent resin is a starch-based water-absorbent resin.

In the embodiment of the invention, the phase-change energy storage material is a ternary compound consisting of a sodium chloride solution, water-absorbing resin and phase-change wax; or the phase change energy storage material is a ternary compound consisting of sodium chloride solution, water-absorbing resin and sodium polyacrylate hydrogel.

The pure sodium chloride solution has high fluidity, after the sodium chloride solution is compounded with the water-absorbent resin and the phase-change wax or the sodium polyacrylate, the viscosity of the sodium chloride solution absorbed by the water-absorbent resin is increased, and the system is in a gel state, and a large number of experiments prove that when the concentration of the sodium chloride solution is 0.1-0.2%, the phase-change temperature of the formed ternary composite system is 0-15.3 ℃, and the sodium chloride solution is suitable for the temperature control packaging of temperature-sensitive products at the temperature of 2-12 ℃.

In the preferred embodiment of the invention, the phase-change energy storage material is a quaternary compound consisting of sodium chloride solution, water-absorbing resin, phase-change wax and sodium polyacrylate hydrogel, and a physical gel system consisting of the four raw materials has the phase-change temperature of-0.5 to-18.3 ℃, and is suitable for temperature control packaging of temperature-sensitive products at the temperature of 1 to-15 ℃.

In the embodiment of the invention, the biodegradable material comprises the following components in parts by weight: 75-90 parts of polylactic acid, 3-9 parts of nano cellulose and 0.5-10 parts of polyethylene terephthalate.

In the embodiment of the invention, the nano-cellulose is prepared by the following steps:

adding natural cellulose pulp into a sulfuric acid solution, soaking for 5-10 min, transferring into a constant-temperature water bath kettle, reacting for 90-150 min, taking out, washing with deionized water to be neutral, and drying for 36-48 h to obtain the nano cellulose.

Preferably, the mixing weight ratio of the natural cellulose pulp to the sulfuric acid solution is 1: 9-12.

In embodiments of the invention, the natural cellulose pulp may be selected from pulp from one or more of banana straw, corn stover, bagasse, or cotton.

In the embodiment of the invention, the temperature of the water bath of the thermostatic water bath is preferably controlled to be 50-60 ℃, and in the temperature range, the natural cellulose pulp can be sufficiently acidolyzed to generate nano cellulose crystals with small and uniform particle size.

The embodiment of the invention also provides a preparation method of the heat preservation bag applied to refrigerated transport, which comprises the following steps:

101, putting the biodegradable material into a film blowing machine, controlling the film blowing temperature to be 160-180 ℃, extruding and processing the biodegradable material into a film, and preparing the film into an outer packaging bag.

In the embodiment of the present invention, the outer packaging bag made of the film is manufactured by the existing manufacturing process. The outer packaging bag can be made into a three-edge sealed edge, one edge is open, and the open edge is convenient for filling the phase change energy storage material.

And 102, filling the phase change energy storage material into the outer packaging bag, and sealing to obtain the heat preservation bag applied to refrigeration transportation.

The filling amount of the phase change energy storage material is not too much, otherwise, when the outer packaging bag is sealed, the phase change energy storage material overflows, so that the sealing performance of the outer packaging bag is influenced, and the filling volume of the phase change energy storage material is preferably 85% -90% of the volume of the outer packaging bag.

The technical solution and the technical effect of the present invention will be further described by specific examples.