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Method for preparing straw based super absorbent resin fertilizer at normal temperature

A technology of superabsorbent resin and superabsorbent resin, applied in fertilizer mixture, fertilization device, application, etc., can solve the problems of high price and high toxicity, achieve low cost, long fertilizer efficiency, and improve the effect of crop growth environment

Inactive Publication Date: 2014-05-21
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most biochemical inhibitors are expensive and highly toxic, making it difficult to widely use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] (1) Straw pretreatment: wash, dry, shorten and crush the straw, pass through a 100-mesh standard sieve, and collect straw powder with a particle size below 100 mesh;

[0010] (2) Preparation of urea-containing straw-based superabsorbent resin fertilizer: take 1.0 g of the straw powder obtained in step 1, add N,N'-methylenebisacrylamide, add urea, then add neutralization degree of 30%, concentration 10% acrylic acid solution. Stir and mix the above reaction raw materials evenly, pass nitrogen to remove oxygen for 0.5 hours, add Na 2 SO 3 and K 2 S 2 o 8 , 20 o C for 6 hours, and the reaction product is dried to obtain straw-based superabsorbent resin fertilizer containing urea. In the reaction, straw: acrylic acid solution: N, N'-methylenebisacrylamide: urea: K 2 S 2 o 8 :Na 2 SO 3 The mass ratio is 1:20:0.002:0.5:0.04:0.02. Technical indicators: water absorption rate 146.6g / g, straw addition 28.6%, urea content 14.3%.

Embodiment 2

[0012] (1) Straw pretreatment: wash, dry, shorten and crush the straw, pass through a 100-mesh standard sieve, and collect straw powder with a particle size below 100 mesh;

[0013] (2) Preparation of urea-containing straw-based superabsorbent resin fertilizer: Take 1.0 g of the straw powder obtained in step 1, add N,N'-methylenebisacrylamide, add urea, then add neutralization degree of 50%, concentration 10% acrylic acid solution. Stir and mix the above reaction raw materials evenly, pass nitrogen to remove oxygen for 0.5 hours, add Na 2 SO 3 and K 2 S 2 o 8 , 25 o C for 4 hours, and the reaction product is dried to obtain straw-based superabsorbent resin fertilizer containing urea. In the reaction, straw: acrylic acid solution: N, N'-methylenebisacrylamide: urea: K 2 S 2 o 8 :Na 2 SO 3 The mass ratio is 1:40:0.006:1:0.08:0.04. Technical indicators: water absorption rate 204.1g / g, straw addition 17.7%, urea content 17.7%.

Embodiment 3

[0015] (1) Straw pretreatment: wash, dry, shorten and crush the straw, pass through a 100-mesh standard sieve, and collect straw powder with a particle size below 100 mesh;

[0016] (2) Preparation of urea-containing straw-based superabsorbent resin fertilizer: Take 1.0 g of the straw powder obtained in step 1, add N,N'-methylenebisacrylamide, add urea, then add neutralization degree of 70%, concentration 10% acrylic acid solution. Stir and mix the above reaction raw materials evenly, pass nitrogen to remove oxygen for 1 hour, add Na 2 SO 3 and K 2 S 2 o 8 , 30 o C for 3 hours, and the reaction product is dried to obtain straw-based superabsorbent resin fertilizer containing urea. In the reaction, straw: acrylic acid solution: N, N'-methylenebisacrylamide: urea: K 2 S 2 o 8 :Na 2 SO 3 The mass ratio is 1: 80: 0.01: 2: 0.16: 0.08. Technical indicators: water absorption rate 109.4g / g, straw addition 9.1%, urea content 18.2%.

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Abstract

The invention discloses a method for preparing straw based super absorbent resin fertilizer at normal temperature with low cost. The method comprises the following steps: (1) straw pretreatment: cleaning, drying, cutting and grinding straws, sieving with a 100-mesh standard sieve and collecting straw powder with particle size of less than 100 meshes; (2) preparation of urea-containing straw based super absorbent resin fertilizer: sequentially adding N'N-methylene bisacrylamide, urea and acrylic acid solution with concentration of 10% and neutralization degree of 30-70% into straw powder obtained in the step 1, stirring and mixing the above reaction raw materials uniformly, introducing nitrogen gas for deoxidization for 0.5-1h, adding Na2SO3 and K2S2O8 for reaction for 3-5h at 20-30 DEG C, and drying to obtain the urea-containing straw based super absorbent resin fertilizer, wherein the mass ratio of straw to acrylic acid solution to N'N-methylene bisacrylamide to urea to K2S2O8 to Na2SO3 is 1:20-80:0.002-0.01:0.5-2:0.04-0.16:0.02-0.08 in the reaction process.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin used for agricultural slow-release fertilizers, in particular to a straw-based superabsorbent resin containing urea and a preparation method thereof at normal temperature. Background technique [0002] Fertilizers are the material basis for increasing grain production. According to statistics from the Food and Agriculture Organization of the United Nations (FAO), global fertilizers contribute about 40% to 60% to crop production. my country feeds 22% of the world's population with 9% of the world's arable land, among which chemical fertilizers contribute about 50% to the increase in grain production, which is indispensable. my country is the world's largest producer and consumer of chemical fertilizers. The annual output of chemical fertilizers accounts for about 30% of the world's total, and its consumption accounts for 35% of the world's total. The nutrient release speed of tradi...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 张峰侯贵华许宁唐贵
Owner YANCHENG INST OF TECH