CN-121974471-A - PH-responsive slow-release long-acting aquatic product oxygenation agent and preparation method and application thereof

Abstract

The invention discloses a pH response type slow-release long-acting aquatic product oxygenation agent, and a preparation method and application thereof, and belongs to the technical fields of aquaculture and fresh and alive aquatic product transportation. The pH responsive slow-release long-acting aquatic product oxygenation agent provided by the invention has the functions of intelligent slow release and water quality stabilization. The invention initiates a pH response oxygen release mechanism, can automatically adjust the oxygen release speed according to the actual chemical state of the water body, and realizes the span from 'passive release' to 'intelligent regulation'. Not only can provide stable oxygen supply for 24 hours, but also can effectively inhibit the fluctuation of the pH value of the water body in the use process, can control the pH rise within 1.5, and creates a more stable living environment.

Inventors

• ZHANG YUYONG
• MA CHENGXUE
• GE YANLONG
• JIA ZHIYING

Assignees

• 中国水产科学研究院黑龙江水产研究所

Dates

Publication Date

20260505

Application Date

20260204

Claims (10)

1. 1. The pH response type slow-release long-acting aquatic product oxygenation agent is characterized by comprising an oxygenation core, an intelligent response coating layer and an outer coating, wherein the intelligent response coating layer is coated outside the oxygenation core; The oxygenation core comprises a main oxygenation agent, an auxiliary agent and a slow-release matrix, wherein the auxiliary agent comprises a pH slow-release agent and a free radical scavenger, and the intelligent response coating layer comprises cellulose acetate and a pH sensitive polymer.
2. 2. The pH-responsive slow release long-acting aquatic product oxygenation agent of claim 1, wherein the weight of the intelligent response coating layer is 10% -30% of the oxygenation core weight.
3. 3. The pH-responsive slow-release long-acting aquatic product oxygenation agent according to claim 1, wherein the main oxygenation agent is 50-70 parts by mass, the pH buffer is 10-20 parts by mass, the free radical scavenger is 5-10 parts by mass, and the slow-release matrix is 15-25 parts by mass.
4. 4. The pH responsive slow release long acting aquatic product oxygenation agent according to claim 1, wherein, The main oxygen increasing agent comprises one or more of calcium peroxide, sodium percarbonate and percarbonamide, and/or, The pH slow release agent is selected from calcium dihydrogen phosphate or citric acid, and/or, The radical scavenger is selected from silicate or urea, and/or, The slow release matrix is selected from dextrin or soluble starch.
5. 5. The pH-responsive slow release long-acting aquatic oxygenation agent of claim 1, wherein the pH-sensitive polymer is selected from chitosan, chitosan derivatives, or sodium alginate.
6. 6. A method for preparing the pH-responsive slow-release long-acting aquatic oxygenation agent according to any one of claims 1-5, comprising the following steps: weighing raw materials according to parts by weight, uniformly mixing the main oxygenation agent, the pH buffering agent, the free radical scavenger and the slow-release matrix in a dry environment, and pressing into a tablet oxygenation core through a tablet press; Dissolving cellulose acetate and pH sensitive polymer in a mixed solvent to prepare uniform coating liquid; Placing the tablet-shaped oxygenation core into a coating machine, uniformly spraying the coating liquid under the conditions of temperature control and wind control, performing primary coating, and forming an intelligent response coating layer outside the tablet-shaped oxygenation core after drying; And (3) performing secondary coating on the outer part of the intelligent response coating layer to form an outer coating, and preparing the pH response type slow-release long-acting aquatic product oxygenation agent.
7. 7. The method according to claim 6, wherein the mass ratio of the cellulose acetate to the pH-sensitive polymer is (1-3) to 1.
8. 8. The method according to claim 6, wherein the mixed solvent is a mixed solvent of acetone and water.
9. 9. The method according to claim 6, wherein the coating liquid used for the secondary coating is beeswax or an ethanol solution of stearic acid.
10. 10. Use of the pH-responsive slow-release long-acting aquatic oxygenation agent of any one of claims 1-5 in aquaculture and in-vivo transportation.

Description

PH-responsive slow-release long-acting aquatic product oxygenation agent and preparation method and application thereof Technical Field The invention belongs to the technical field of aquaculture and fresh and alive aquatic product transportation, and particularly relates to a pH response type slow-release long-acting aquatic product oxygenation agent, and a preparation method and application thereof. Background In aquaculture and in-vivo transport, dissolved oxygen is a critical factor limiting density and survival. Chemical oxygen increasing agents such as calcium peroxide and sodium percarbonate are widely used because they do not depend on electricity and take effect quickly. However, the prior art has obvious defects that firstly, calcium peroxide is taken as an example, the calcium peroxide reacts rapidly in water, a large amount of oxygen and calcium hydroxide are released in a short time, partial dissolved oxygen supersaturation and rapid pH rise (more than 10) are caused, active oxygen free radicals with oxidative stress harm are generated, and the aquatic organisms are damaged in an emergency way, which is the same as the hypoxia itself. Secondly, the duration is short, the conventional powder or tablet lacks a slow release design, oxygen release is concentrated in the first few hours, and the sustained oxygen consumption requirement of fish is difficult to match, and particularly in long-distance transportation or high-density culture ponds, frequent throwing is required, so that time and labor are wasted. Third, the prior slow release technology is lack of intelligence, and the slow dissolution of the physical barrier is mostly relied on, the oxygen release rate is mainly influenced by physical factors such as water temperature, water flow and the like, and the most important chemical index pH value change of the water body cannot be responded. Oxygen supply cannot be accelerated when the fish is well metabolized and carbon dioxide is accumulated to lower the pH value, and the oxygen supply cannot be accelerated to reduce the harm when the pH value is raised due to the side effect of the oxygen increasing agent. Therefore, developing an oxygen increasing agent which can intelligently regulate and control oxygen release behavior according to the pH of a water body, realize long-acting stable oxygen supply and furthest reduce pH fluctuation and free radical damage is a technical problem to be solved in the field. Disclosure of Invention Aiming at the problems, the invention provides a pH response type slow-release long-acting aquatic product oxygenation agent, and a preparation method and application thereof. The pH responsive slow-release long-acting aquatic product oxygenation agent provided by the invention can realize negative correlation linkage of the oxygen release rate and the pH of the water body (namely, the lower the pH is, the faster the oxygen release is, the higher the pH is, the oxygen release is automatically slowed down), thereby ensuring continuous oxygen supply, simultaneously automatically inhibiting abnormal rise of the pH of the water body, maintaining stable water quality and reducing stress on farmed organisms. In order to achieve the aim of the invention, the invention adopts the following technical scheme: The invention provides a pH response type slow-release long-acting aquatic product oxygenation agent, which comprises an oxygenation core, an intelligent response coating layer and an outer coating, wherein the intelligent response coating layer is coated outside the oxygenation core; the oxygenation core comprises a main oxygenation agent, an auxiliary agent and a slow-release matrix, wherein the auxiliary agent comprises a pH slow-release agent and a free radical scavenger, and the intelligent response coating layer comprises cellulose acetate and a pH sensitive polymer. Further, the weight of the intelligent response coating layer accounts for 10% -30% of the weight of the oxygenation core. Further, the main oxygenation agent is 50-70 parts by mass, the pH buffering agent is 10-20 parts by mass, the free radical scavenger is 5-10 parts by mass, and the slow-release matrix is 15-25 parts by mass. Further, the main oxygenating agent comprises one or more of calcium peroxide, sodium percarbonate and percarbonamide, and/or, The pH slow release agent is selected from calcium dihydrogen phosphate or citric acid, and/or, The radical scavenger is selected from silicate or urea, and/or, The slow release matrix is selected from dextrin or soluble starch. As the main oxygenation agent, the calcium peroxide, sodium percarbonate or percarbamide can provide an oxygen source. As pH buffers, monocalcium phosphate and citric acid can be used to neutralize alkaline substances generated by hydrolysis of the primary oxygenator, alleviating the initial pH impact. As a free radical scavenger/stabilizer, silicates such as food grade magnesium silicate or urea are used to adsorb or decompos