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Urea formaldehyde modified sodium alginate copolymer and application thereof

A technology of sodium alginate and copolymer, applied in application, water pollutants, fertilizer mixture and other directions, can solve the problems of high price of sodium alginate, poor chemical stability, etc., and achieve good slow-release effect, improved stability, and good biodegradation sexual effect

Active Publication Date: 2020-05-22
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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  • Urea formaldehyde modified sodium alginate copolymer and application thereof
  • Urea formaldehyde modified sodium alginate copolymer and application thereof
  • Urea formaldehyde modified sodium alginate copolymer and application thereof

Examples

Experimental program
Comparison scheme
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 application thereof, wherein the copolymer is a sodium alginate-urea formaldehyde grafted copolymer block copolymer,formaldehyde and urea react in an alkaline stage, then sodium alginate is added, a condensation polymerization reaction is performed under an acidic condition, and finally drying is conducted after ball dropping forming is conducted in a calcium chloride solution, wherein sodium alginate is extracted from brown algae kelp or sargassum. According to the invention, the urea formaldehyde modified sodium alginate can be used as a heavy metal adsorption material in the environmental field, can prevent nutrient loss in soil and slowly release nutrients, and can also be used as a slow release material in soil due to good biodegradability.

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 Applications(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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