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Method for preparing agricultural water-retaining agent from degummed alga dreg

A technology for agricultural water-retaining agent and seaweed slag, which is applied in chemical instruments and methods, applications, agriculture, etc., can solve the problems of poor water-absorbing effect of water-retaining agent, difficult to control high pressure, etc., achieves high water absorption multiple, is conducive to retention, and accelerates the reaction rate Effect

Active Publication Date: 2016-07-20
青岛聚大洋藻业集团有限公司
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the unsustainable use of seaweed residue and the difficulty in controlling high temperature and high pressure in the preparation process of water-retaining agent, and the poor effect of water-retaining agent on absorbing salt water, the present invention proposes a method for preparing agricultural water-retaining agent by using degummed seaweed residue. Degummed seaweed slag is pretreated by alkali modification, then subjected to refining, bleaching and other processes to obtain 60-80 mesh crude cellulose; then under ultrasonic conditions, the temperature is 70°C-75°C, and the ultrasonic reaction is about 5 minutes for grafting , cross-linking to obtain a high multiple salt-resistant water-absorbing resin, and subsequent treatment to obtain a water-retaining agent

Method used

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  • Method for preparing agricultural water-retaining agent from degummed alga dreg
  • Method for preparing agricultural water-retaining agent from degummed alga dreg

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preparation example Construction

[0028] Such as figure 1 As shown, the preparation method of the agricultural water-retaining agent of the present invention specifically comprises the following steps:

[0029] Step 1. Alkali modification, put the degummed seaweed residue into the alkali treatment tank, add 10%-14% sodium hydroxide solution with a mass concentration, control the liquid-to-solid ratio at about 3:1, and conduct alkali treatment at 90°C for 4 hours to obtain seaweed extract one;

[0030] Step 2, centrifuging and refining, the seaweed extract is centrifuged and washed, and then passed into a refiner for refining, so that the refined extract passes through a 40-mesh sieve, and the sieved extract is centrifuged for later use;

[0031] Step 3, bleaching and washing, add water to the refined extract according to the liquid-to-solid ratio of 4:1, and add 10% available chlorine sodium hypochlorite solution to bleach for 30 minutes, the amount of sodium hypochlorite solution added is five minutes of the...

Embodiment 1

[0037] In the alkali treatment reaction tank, add 100 g of degummed seaweed residue, then add 300 g of 10% sodium hydroxide solution, and perform alkali treatment at 90° C. for 4 hours to obtain seaweed extract 1; the seaweed extract 1 is centrifuged and washed , and then passed into a refiner for refining, making the refined extract pass through a 40-mesh sieve, and the sieved extract is centrifuged for subsequent use; add about 400g of water to the refined extract, and add 10% effective Chlorine sodium hypochlorite solution 20g bleach for 30 minutes, then add industrial hydrochloric acid, make the pH in the bleaching tank reach between 4-5, acidify for 30 minutes, get white fluffy seaweed extract 2, wash and centrifuge for later use; add 40g in the mixing tank Industrial-grade acrylic acid, neutralize with 40g of 30% sodium hydroxide, control neutralization temperature below 45°C, neutralization degree is 75%, add 0.5g of potassium persulfate, 0.08g of MBA (N, N- Methylenebi...

Embodiment 2

[0039]In the alkali treatment reaction tank, add 100 g of degummed seaweed residue, then add 300 g of sodium hydroxide solution with a mass fraction of 14%, and perform alkali treatment at 90 ° C for 4 hours to obtain seaweed extract 1; the seaweed extract 1 is washed after centrifugation , and then passed into a refiner for refining, making the refined extract pass through a 40-mesh sieve, and the sieved extract is centrifuged for subsequent use; add about 400g of water to the refined extract, and add 10% effective Chlorine sodium hypochlorite solution 20g bleach for 30 minutes, then add industrial hydrochloric acid, make the pH in the bleaching tank reach between 4-5, acidify for 30 minutes, get white fluffy seaweed extract 2, wash and centrifuge for later use; add 40g in the mixing tank Industrial grade acrylic acid, neutralize with the sodium hydroxide of 30% concentration of 40g, control neutralization temperature at 30 ℃, neutralization degree is 65%, add the MBA of the p...

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Abstract

The invention discloses a method for preparing an agricultural water-retaining agent from degummed alga dregs. The method comprises the following steps: firstly, selecting a certain amount of degummed alga dregs, and adding an alkali liquid into the degummed alga dregs for alkalization so as to obtain an alga extract I; sequentially centrifuging, pulping, screening, bleaching and washing the alga extract I, and adding acid to adjust the pH value to be 4-5, so as to obtain a fluffy alga extract II; neutralizing crylic acid and sodium hydroxide of equal mass, mixing with the alga extract II, adding potassium peroxodisulfate as a catalyst and N,N-methylene bisacrylamide as a cross-linking agent so as to obtain a mixed liquid, putting the mixed liquid into a container to be placed into an ultrasonic reaction kettle, and setting the temperature to be 70-75 DEG C to perform ultrasonic reaction for a certain time till the mixed liquid is formed into gel; finally, washing the gel, pelletizing, and drying, thereby obtaining the water-retaining agent. The water-retaining agent prepared by using the method is slow in water absorption and release but high in water absorption capacity, and is relatively beneficial to water retention and retention of nutrient elements in soil.

Description

technical field [0001] The invention relates to the technical field of preparation of water-retaining agents, in particular to a method for preparing agricultural water-retaining agents rich in seaweed extracts from degummed seaweed residues. Background technique [0002] In recent years, with the vigorous development of the marine industry, a series of seaweed industries such as the extraction of alginate and alginate from algae such as red algae and brown algae are developing rapidly. The degummed seaweed residue is generally discarded directly or treated with low value, resulting in huge waste, and various algae do not have a relatively mature clean follow-up treatment process. [0003] Most of the common water-retaining agents in the market are produced by acrylic acid self-crosslinking technology. In its production process, many high-risk and difficult-to-operate technological processes are required, such as high temperature and high pressure and nitrogen protection. Fo...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F220/06C08F222/38C09K17/18C09K101/00
CPCC08F251/02C09K17/18C09K2101/00C08F220/06C08F222/385
Inventor 孙继吴仕鹏程跃谟高杰贾福强殷聪
Owner 青岛聚大洋藻业集团有限公司
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