Process for synthesizing gel-based water-holding slow-release carbamide fertilizer and production method

A technology of slow-release urea and a synthesis method, which is applied in the compound field of gel-based water-retaining slow-release urea fertilizer, high water-swelling chemical nitrogen fertilizer, chemical fertilizer and super-absorbent agent

CN101225009AInactive Publication Date: 2008-07-23SHENZHEN BATIAN ECOTYPIC ENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2008-07-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a synthetic method for gel-based water-retained slow-release urea fertilizer, mainly comprising the following steps: 1) acrylic monomer is neutralized with 20% potassium hydroxide solution, obtaining a mixed monomer solution with twenty-five percent neutralization degree; 2) the mixed monomer solution is gauged and added into an aqueous urea, forming a polymerization mixed liquid; 3) a cross-bonding agent is added on the condition of heat-preservation stirring, and then a radical initiator is added after agitating the awaiting cross-bonding agent to dissolve; 4) a water gel is generated when the of polymerization is generated on the condition of heat-preservation stirring; 5) the gel-based water-retained slow-release urea fertilizer is crushed, dried, grinded, screened and packed. The synthetic method for gel-based water-retained slow-release urea fertilizer has the advantages of no-use of organic solvent, no solvent recovery problem, simple craft and lower cost.
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Description

technical field

[0001] The invention relates to the chemical fertilizer industry and the technical field of agricultural chemical fertilizers, in particular to a composite technology of chemical fertilizers and superabsorbents, which is to polymerize superabsorbents (water-retaining agents known in agriculture) and urea fertilizers through chemical polymerization into The integrated material belongs to the high water-absorbing and swelling chemical nitrogen fertilizer. The fertilizer has the function of delaying the release of nutrients. It is a gel-based water-retaining and slow-release urea fertilizer. Background technique

[0002] Drought is one of the main constraints faced by agricultural production, and the fertilizers widely used in agriculture do not have the function of absorbing and retaining water. On the other hand, the fertilizers widely used in agriculture are mainly highly water-soluble fertilizers, which are characterized by high water solubility and quick-ac...

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Embodiment Construction

[0045] The gel is in a gel state when a solvent or a monomer or oligomer is contained in the cross-linked bulk polymer.

[0046] With reference to Fig. 1, shown in 2, the present invention discloses a kind of synthetic method of gel-based water-retaining slow-release urea fertilizer, and it mainly comprises the following steps:

[0047] 1) The acrylic acid monomer is neutralized with 20% potassium hydroxide solution to obtain a mixed monomer solution with a neutralization degree of 25%;

[0048] The production process of the acrylic acid is as follows: remove the polymerization inhibitor in the chemical-grade or industrial-grade acrylic acid by depressurizing or heating to obtain the acrylic acid without the polymerization inhibitor.

[0049] Polymerization inhibitors are inhibitory substances added to prevent the self-polymerization of acrylic acid during storage and transportation, such as hydroquinone.

[0050] The technological process of described potassium hydroxide sol...