Oxidized peat fulvic acid composite water retaining agent and preparation method thereof

Abstract

An oxidized peat fulvic acid composite water retaining agent is prepared from, by mass, 50-60 parts of oxidized peat fulvic acid, 15-25 parts of cationic compound monomers, 8-15 parts of anionic compound monomers, 0.1-0.8 part of a cross-linking agent and 0.4-3.8 parts of initiator. The oxidized peat fulvic acid is prepared from, by mass, 1 part of oxidized peat, 0.05-0.20 part of an oxidizing agent and 2.95-8 parts of industrial pure water. The cationic compound monomer is one of (3-methacrylamidipropyl) trimethyl ammonium chloride, methyl acrylyl ethyl trimethyl ammonium iodide, (3-acrylamidopropyl)trimethyl ammonium chloride, dimethylaminoethyl methacrylate, N,N-dimethylaminoethyl acrylate and 2-diethylaminoethyl methacrylate. The cross-linking agent is composed of, by mass, 5-8 parts of N,N-methylene bisacrylamide and 0.5-3 parts of glycerine or ethylene glycol diglycidyl ether or dimethylol urea. The initiator is prepared from, by mass, 5 parts of ammonium persulfate and 1-4 parts of potassium sulfite.

Description

technical field [0001] The invention relates to the technical field of high salt-tolerant agricultural water-absorbing resin products. In particular, it relates to a composite water-retaining agent based on fulvic acid extracted from oxidized peat and its preparation technology. Background technique [0002] my country's water resources are poor and soil erosion is serious, which is the grim reality that the current agricultural development is facing. Therefore, the rational and efficient use of limited water resources and the implementation of water-saving agriculture are the inevitable trend of my country's agricultural development. Among the many water-saving and water-saving technical measures, the rapid development of chemical water-saving technology in recent years, that is, the application of superabsorbent polymer or water-retaining agent (SuperAbsorbentPolymer, code-named SAP) has attracted more and more attention from experts and farmers. SAP is divided into thre...

AI Technical Summary

Problems solved by technology

Secondly, the current water-retaining agents are almost all anionic skeletons, which cannot avoid network structure contraction or even disintegration caused by chelation with high-priced metal ions in the environment, resulting in reduced water absorption performance, which limits the popularization and application of olefin-based water-retaining agents

Starch series is favored by people because of its wide source of raw materials, biodegradability, no secondary pollution, large output, low price, and high safety. However, there are also products with low strength, poor water absorption and salt resistance. , easy to deteriorate and rot in the soil, short service life and other defects

Third, the general water-retaining agent only has the function of "water retention", but lacks the effect of "conserving fertilizer and increasing efficiency", making it difficult to preserve nutrients for plants

200510105506.X In order to solve the problems of poor salt-alkali tolerance, compacted soil and high production cost existing in existing water-retaining agents, a humic acid-based agricultural and forestry water-retaining ecological treatment agent and its preparation method were proposed

However, although the cost of the resin products of these inventions has been reduced, there are still problems such as humic acid polymerization inhibition, insufficient grafting reaction, complicated process, the use of organic solvents, and insignificant modification effects.

[0004] In summary, the main problems of current agricultural water-retaining agents are still: (1) Poor salt-alkali tolerance, it is difficult to meet the water absorption requirements in practical applications; (2) Difficult to degrade naturally, long-term use will cause soil compaction, pH (3) The price is high, usually the market price of this type of water-retaining agent is 20,000-4,000 yuan / ton, which is difficult to popularize in agricultural and forestry applications; (4) Propylene-based monomer residues in the resin The high content not only leads to the decline of water absorption capacity, but also has the problems of land pollution and threat to human health; (5) Poor fertilizer retention performance, easy loss of plant nutrients

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