阅读说明：本技术 一种金枪鱼用冷链蓄冷剂及其制备方法 (Cold chain coolant for tuna and preparation method thereof ) 是由 不公告发明人 于 2019-11-13 设计创作，主要内容包括：本发明提出了一种金枪鱼用冷链蓄冷剂的制备方法,由以下方法制备：S1.将氯化钠、甘油加入纯水中,混合均匀,备用；S2.将食用油、石蜡油的混合液混合均匀,取海藻酸钠吸水树脂溶于20g水得到的溶液倒入上述混合油中,搅拌均匀,继续倒入步骤S1得到的混合液,搅拌,得到油包水乳液,迅速转移至冰水混合物中,继续搅拌,将体系倒入液氮中,用无水乙醇洗涤微球,再烘干,最后,通过筛网分离干燥的微球,筛选直径小于1mm的微球；S4.将步骤S3得到的微球降温处理,取出,包装,得到金枪鱼用冷链蓄冷剂。本发明采用的原料为食品级,成品也为食品级,且吸水树脂粉吸水率极高,具有高效、无毒、无害、无污染的优点,能够被广泛的应用于冷链物流。(The invention provides a preparation method of a cold chain coolant for tuna, which comprises the following steps: s1, adding sodium chloride and glycerol into pure water, and uniformly mixing for later use; s2, uniformly mixing the mixed liquid of edible oil and paraffin oil, pouring a solution obtained by dissolving sodium alginate water-absorbent resin in 20g of water into the mixed oil, uniformly stirring, continuously pouring the mixed liquid obtained in the step S1, stirring to obtain a water-in-oil emulsion, quickly transferring the water-in-oil emulsion into an ice water mixture, continuously stirring, pouring the system into liquid nitrogen, washing microspheres with absolute ethyl alcohol, drying, finally, separating the dried microspheres through a screen, and screening the microspheres with the diameter of less than 1 mm; and S4, cooling the microspheres obtained in the step S3, taking out and packaging to obtain the cold chain coolant for the tuna. The raw materials adopted by the invention are food grade, the finished product is also food grade, and the water absorption rate of the water-absorbent resin powder is extremely high, so that the water-absorbent resin powder has the advantages of high efficiency, no toxicity, no harm and no pollution, and can be widely applied to cold-chain logistics.)

1. A preparation method of sodium alginate water-absorbent resin powder is characterized by comprising the following steps: adding sodium alginate into water, stirring for dissolving, adding an initiator, and adding a cross-linking agent and a grafting monomer after reaction; and after the reaction is finished, drying the product in an oven to constant weight, crushing the product by using a crusher, and filtering the crushed product by using a screen to obtain the sodium alginate water-absorbing resin powder.

2. The method for preparing sodium alginate water-absorbent resin powder as claimed in claim 1, wherein the initiator is benzoyl peroxide, the grafting monomer is acrylic acid, and the crosslinking agent is isocyanate.

3. The method for preparing the sodium alginate water-absorbent resin powder as claimed in claim 1, wherein the process conditions are that the concentration of the sodium alginate solution is 15-20 wt%, the addition amount of the initiator is 0.5-1 wt% of the total system mass, the addition amount of the cross-linking agent is 80-120% of the mass of the sodium alginate, the addition amount of the grafting monomer is 400-600% of the mass of the sodium alginate, the pH value of acrylic acid is 6-6.5, the initiation reaction time is 30-50min, the cross-linking reaction time is 1-2h, the reaction temperature is 45-55 ℃, the drying temperature of the oven is 45 ℃, the drying time is 10-15h, and the mesh number of the screen is 150 meshes.

4. A preparation method of a cold chain coolant for tuna is characterized by comprising the following steps:

s1, adding sodium chloride and glycerol into pure water, and uniformly mixing for later use;

s2, uniformly mixing a mixed solution of edible oil and paraffin oil, pouring a solution obtained by dissolving sodium alginate water-absorbent resin in water into the mixed oil, uniformly stirring, continuously pouring the mixed solution obtained in the step S1, stirring the mixture at 75 ℃ for 30-50min to obtain a water-in-oil emulsion, quickly transferring the water-in-oil emulsion into an ice water mixture, continuously stirring for 10-30min, pouring a mixture system into liquid nitrogen, subsequently washing microspheres with absolute ethyl alcohol, drying the microspheres in an oven at 60 ℃, finally separating the dried microspheres through screens with different apertures, and screening the microspheres with the diameter smaller than 1 mm;

s4, placing the microspheres obtained in the step S3 into a freezing chamber with the temperature of-20 ℃ for cooling treatment for 1-2h, taking out and packaging to obtain the cold chain coolant for the tuna.

5. The preparation method of the cold chain coolant for tuna according to claim 4, wherein the mass ratio of the sodium chloride, the glycerol and the water is (30-60): (10-20): 100.

6. the method for preparing the cold chain coolant for the tuna according to claim 4, wherein the mass ratio of the edible oil to the paraffin oil in the mixed oil is (3-5): 2, the mass ratio of the mixed oil to the sodium alginate absorbent resin powder to the mixed liquid is 100: (10-20): (50-70).

7. A cold chain coolant for tuna prepared by the method according to any one of claims 4 to 6.

8. A preparation method of a cold chain coolant for tunas is characterized by adding sodium alginate water-absorbing resin powder, sodium chloride and glycerol into water, uniformly stirring, cooling in a refrigerating chamber at the temperature of 20 ℃ below zero for 1-2 hours, taking out, and packaging to obtain the cold chain coolant for the tunas.

9. The preparation method of the cold chain coolant for tuna according to claim 8, wherein the mass ratio of the sodium alginate water-absorbent resin powder, sodium chloride, glycerol and water is 1: (90-170): (30-45): (220-300).

10. A cold chain coolant for tuna prepared by the preparation method according to claim 8 or 9.

Technical Field

The invention relates to the technical field of aquatic product preservation, in particular to a cold-chain cold storage agent for tuna and a preparation method thereof.

Background

The cold accumulation technology stores cold energy in a cold chain cold accumulation agent by using effective means such as physics, chemistry, machinery and the like, and releases the stored cold energy when needed. The cold accumulating agent produced by the technology can efficiently store cold energy and meet various physical and chemical requirements.

The cold chain cold accumulation agent is a viscous colloidal mixture composed of organic or (and) inorganic compounds, can absorb and store a large amount of cold at low temperature, can emit a large amount of cold at higher temperature, and can keep the low-temperature environment of the cold chain cold accumulation agent and the surrounding in a small range for a long time.

The tuna cold-chain logistics distribution system is a system which is urgently needed to be established at present, is a link for closely connecting high-quality tuna products with consumers, and is a bridge and a network for developing the tuna market in China.

The main problem in the field of tuna cold chain transportation is chain breakage of a cold chain link, the tuna cold chain is loaded into a transport vehicle after precooling in a producing area to reach a wholesale market in a selling area and finally enters a retail link for storage, and the chain breakage of the cold chain is easy to occur in the several links. The cold-chain cold storage agent can effectively solve the problems encountered in precooling from a production place to a transport vehicle and in storage from a wholesale market to a retailer and the problems encountered in a food and drug transportation process, solve the fluctuation of the storage and transportation temperature of the tuna, realize the continuity of the storage temperature, control the quality of products to the maximum degree and improve the added value.

The existing cold accumulation technology is widely applied at present, the types of cold-chain cold accumulation agents are continuously updated, and some cold accumulation agents are prepared by adding poly-N-vinyl acetamide and sodium borate into a sodium chloride aqueous solution; the cold chain cold-accumulating agent is prepared through cross-linking reaction between polyvinyl alcohol and borax which are fully expanded in water to generate a body structure, absorbing a great amount of water to expand the body structure into a semitransparent flowable gel, and adding a great amount of water to ammonium nitrate, ammonium chloride, sodium chloride, calcium chloride, urea, sodium carbonate, sodium sulfate, sodium nitrate and other raw materials to serve as the cold chain cold-accumulating agent. The cold chain coolant in the prior art generally has the problems that a large amount of chemical raw materials are introduced to improve various indexes of cold accumulation, absolute non-toxicity cannot be achieved, transported or stored tuna is polluted once leakage occurs in the using process, and then the serious result of poisoning of a user or an eater is caused. In order to ensure that the cold-chain coolant does not leak, a packing material with high strength and large thickness is required to be used in the cold-chain coolant, so that the use cost and the matching cost of the cold-chain coolant are indirectly improved.

Patent CN 107057652 a cold chain coolant provides a cold chain coolant, comprising the following components: although the adopted preparation raw materials are food-grade raw materials and the obtained cold chain coolant finished product is also food-grade, the cold chain coolant has the advantages of no toxicity, no harm and no pollution, but the cold storage effect of the cold chain coolant cannot be compared with that of a chemical coolant, and the cold chain coolant is difficult to be widely applied.

Disclosure of Invention

The invention provides a cold chain cold storage agent for tuna and a preparation method thereof, the sodium alginate water-absorbing resin has extremely high water absorption efficiency, and good refrigeration effect after water absorption, and the cold chain cold storage agent for tuna is efficient, nontoxic, harmless and pollution-free.

The technical scheme of the invention is realized as follows:

the invention provides a preparation method of sodium alginate water-absorbent resin powder, which comprises the following steps: adding sodium alginate into water, stirring for dissolving, adding an initiator, and adding a cross-linking agent and a grafting monomer after reaction; and after the reaction is finished, drying the product in an oven to constant weight, crushing the product by using a crusher, and filtering the crushed product by using a screen to obtain the sodium alginate water-absorbing resin powder.

As a further improvement of the invention, the initiator is benzoyl peroxide, the grafting monomer is acrylic acid, and the crosslinking agent is an isocyanate.

As a further improvement of the invention, the process conditions comprise that the concentration of the sodium alginate solution is 15-20 wt%, the addition amount of the initiator is 0.5-1 wt% of the total system mass, the addition amount of the cross-linking agent is 80-120% of the mass of the sodium alginate, the addition amount of the grafting monomer is 400-600% of the mass of the sodium alginate, the pH value of acrylic acid is 6-6.5, the initiation reaction time is 30-50min, the cross-linking reaction time is 1-2h, the reaction temperature is 45-55 ℃, the drying temperature of an oven is 45 ℃, the drying time is 10-15h, and the mesh number of the screen is 150 meshes.

The invention further provides a preparation method of the cold chain coolant for tuna, which comprises the following steps:

s1, adding sodium chloride and glycerol into pure water, and uniformly mixing for later use;

s2, uniformly mixing a mixed solution of edible oil and paraffin oil, pouring a solution obtained by dissolving sodium alginate water-absorbent resin in water into the mixed oil, uniformly stirring, continuously pouring the mixed solution obtained in the step S1, stirring the mixture at 75 ℃ for 30-50min to obtain a water-in-oil emulsion, quickly transferring the water-in-oil emulsion into an ice water mixture, continuously stirring for 10-30min, pouring a mixture system into liquid nitrogen, subsequently washing microspheres with absolute ethyl alcohol, drying the microspheres in an oven at 60 ℃, finally separating the dried microspheres through screens with different apertures, and screening the microspheres with the diameter smaller than 1 mm;

s4, placing the microspheres obtained in the step S3 into a freezing chamber with the temperature of-20 ℃ for cooling treatment for 1-2h, taking out and packaging to obtain the cold chain coolant for the tuna.

As a further improvement of the invention, the mass ratio of the sodium chloride, the glycerol and the water is (30-60): (10-20): 100.

as a further improvement of the invention, the mass ratio of the edible oil to the paraffin oil in the mixed oil is (3-5): 2, the mass ratio of the mixed oil to the sodium alginate absorbent resin powder to the mixed liquid is 100: (10-20): (50-70).

The invention further protects the cold chain coolant for the tuna prepared by the preparation method.

As a further improvement of the invention, the sodium alginate water-absorbent resin powder, sodium chloride and glycerol are added into water, stirred uniformly, cooled in a freezing chamber at the temperature of-20 ℃ for 1-2h, taken out and packaged to obtain the cold chain coolant for tuna.

As a further improvement of the invention, the mass ratio of the sodium alginate water-absorbent resin powder to the sodium chloride to the glycerin to the water is 1: (90-170): (30-45): (220-300).

The invention further protects the cold chain coolant for the tuna prepared by the preparation method.

The invention has the following beneficial effects: in the cold chain coolant, the cross-linked sodium alginate water-absorbent resin is obtained by cross-linking acrylic acid with sodium alginate, the water absorption rate is up to 220-plus-300 g/g, the water absorption rate is high, and the cold storage agent adsorption capacity is high, so that the addition amounts of sodium chloride and glycerol are increased, and the cold storage effect is improved. The cold chain coolant disclosed by the invention is coated with the resin by the microspheres with the diameter less than 1mm, so that the cold chain coolant has better low-temperature flow performance and is always in a non-condensed state in use, and therefore, a packing material with lower strength can be adopted, and the use cost of the cold chain coolant is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a comparison of water absorption of each group in test example 1 of the present invention;

FIG. 2 is a comparison of the water retention time of 90% for each group in test example 2 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.