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A kind of urea-formaldehyde modified sodium alginate copolymer and its application

A technology of sodium alginate and copolymer, which is applied in application, water pollutants, fertilizer mixtures, etc., can solve the problems of high price and poor chemical stability of sodium alginate, and achieve the effect of improving chemical stability and reducing costs

Active Publication Date: 2022-02-25
JIANGSU ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a low-cost urea-formaldehyde modified sodium alginate copolymer compound, which overcomes the problems of high price and poor chemical stability of sodium alginate itself. Prevent the loss of nutrients in the soil, slow release nutrients

Method used

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  • A kind of urea-formaldehyde modified sodium alginate copolymer and its application
  • A kind of urea-formaldehyde modified sodium alginate copolymer and its application
  • A kind of urea-formaldehyde modified sodium alginate copolymer and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Preparation of copolymer A1, the specific preparation steps are as follows:

[0031] 1) Mix formaldehyde with the first batch of urea, adjust the pH to 7.5 with a 5% sodium hydroxide solution, and then raise the temperature to 60 o C, add the remaining urea, continue to heat up to 90 o C, insulation 30min, obtains hydroxymethyl urea;

[0032] In this embodiment, the molar ratio of formaldehyde to the total amount of urea added is 1.8:1, and the amount of the first batch of urea added is 40% of the total amount of urea;

[0033] 2) Add sodium alginate (powder) to the hydroxymethyl urea obtained in step 1), and adjust the pH to 5.0 with 5% ammonium chloride solution, 90 o After half an hour of C insulation reaction, the pH was adjusted to 7.5 with 5% sodium hydroxide by mass fraction, and after naturally cooling down to room temperature, a block copolymer was obtained; the mass ratio of sodium alginate and methylol urea added was 1 :5;

[0034] 3) Drop the block copol...

Embodiment 2

[0038] Prepare copolymer A2, its concrete steps are as follows:

[0039] 1) Mix formaldehyde and the first batch of urea in the reactor, adjust the pH to 7.5 with a 5% sodium hydroxide solution, and then raise the temperature to 60 oC, add the remaining urea, continue to heat up to 90 o C, insulation 30min, obtains hydroxymethyl urea;

[0040] In this embodiment, the molar ratio of formaldehyde to the total amount of urea added is 1.8:1, and the amount of the first batch of urea added is 50% of the total amount of urea;

[0041] 2) Add sodium alginate to the product after addition of urea and formaldehyde obtained in step 1), and adjust the pH to 5.0 with 5% ammonium chloride solution, 90 o After half an hour of C insulation reaction, adjust the pH to 7.5, and naturally cool down to room temperature to obtain a block copolymer; the mass ratio of sodium alginate and methylol urea added is 1:10;

[0042] 3) Drop the block copolymer mixture obtained in step 2) into a 0.1mol / L ...

Embodiment 3

[0044] To prepare copolymer A3, in this example, except that the mass ratio of sodium alginate to methylol urea is 1:15, other steps are the same as in Example 1.

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Abstract

The invention relates to a urea-formaldehyde modified sodium alginate copolymer and its application. The copolymer is a sodium alginate-urea-formaldehyde graft copolymer block copolymer. First, formaldehyde and urea are reacted in an alkaline stage, and then added Sodium alginate undergoes polycondensation reaction under acidic conditions, and finally drops into balls in calcium chloride solution and then dries; sodium alginate is extracted from brown algae kelp or sargassum, and the sodium alginate modified by urea formaldehyde It can be used as an adsorption material for heavy metals in the environmental field, and can also prevent nutrient loss in the soil and slow-release nutrients. Due to its good biodegradability, it can also be used in soil as a slow-release material.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a urea-formaldehyde modified sodium alginate copolymer and its application. Background technique [0002] Sodium alginate is a natural polysaccharide extracted from brown algae kelp or sargassum, which is composed of mannuronic acid and α-L-guluronic acid linked by (1→4) bonds, and is biodegradable , gelling, complexing, soluble in water and other advantages. Sodium alginate has many reactive functional groups, such as carboxyl and hydroxyl, which can be grafted and copolymerized with other molecular segments with adsorption function. Because of its strong ion exchange capacity, its hydrogel is widely used in the field of environmental restoration, removing Heavy metal pollutants, dyes, antibiotics, etc. However, sodium alginate is expensive, about 60,000 yuan / ton, and its chemical stability is poor. For example, in a solution of monovalent salt ions, it gradually swells and di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/04C05G3/40C02F1/28C02F101/20
CPCC08B37/0084C05G3/00C02F1/285C02F2101/20
Inventor 曲萍黄红英孙恩惠雍宬徐跃定
Owner JIANGSU ACAD OF AGRI SCI
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