Preparation method of agricultural water-retaining agent with slow-release function of nitrogen and potassium fertilizers from tanning waste leather scraps

A technology of agricultural water-retaining agent and leftover material, which is applied in the fields of application, agriculture, and fertilization equipment, etc., can solve the problems of high technical content of water-retaining and slow-release fertilizer production, high cost of water-retaining and slow-release fertilizer, and complicated process, so as to improve the utilization of resources And added value, good biodegradability, and the effect of filling the gap in the industry

Inactive Publication Date: 2017-12-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the results obtained by these methods, the main technical deficiencies are: 1) The coating materials are mostly derived from non-renewable resources such as petroleum. This type of water-retaining slow-release fertilizer has high cost and poor biodegradability, and long-term use will cause soil compaction. Deformation, easy to cause secondary pollution; 2) The coating layer is mostly super absorbent resin, and its gel strength is greatly reduced after swelling, which is prone to leaks, resulting in uneven nutrient release; 3) Coating and load preparation of water-retaining slow-release fertilizers High production technology, complicated process, and expensive equipment are not conducive to application and promotion; 4) Materials obtained by coating and loading processes have poor water absorption and water retention properties
At present, there is no relevant literature report on the method of preparing agricultural water-retaining agent with slow-release function of nitrogen and potassium fertilizers by using tanning waste leather leftovers, which makes up for the gap in the industry

Method used

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  • Preparation method of agricultural water-retaining agent with slow-release function of nitrogen and potassium fertilizers from tanning waste leather scraps
  • Preparation method of agricultural water-retaining agent with slow-release function of nitrogen and potassium fertilizers from tanning waste leather scraps

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The method for preparing an agricultural water-retaining agent with a slow-release function of chemical fertilizer from tanning waste leather leftovers comprises the following steps:

[0035] (1). Pretreatment: dry and pulverize the waste tanning leather scraps, pass through a 100-mesh sieve; add 15 parts of 5 wt% ammonia water and potassium hydroxide mixed solution to 9 parts of tanning waste leather scraps, and hydrolyze at a temperature of 50°C 30min to obtain collagen hydrolyzate;

[0036] (2). At room temperature, add 5 wt% ammonium bicarbonate, ammonia water, potassium bicarbonate mixed solution to 0.5 part of acrylic acid, so that the neutralization degree of acrylic acid reaches 60%; add 50 wt% ammonium bicarbonate, ammonia water, potassium bicarbonate Add 0.5 parts of maleic anhydride to the mixed solution, so that the degree of neutralization of the maleic anhydride is 40%; mix the treated acrylic acid and maleic anhydride solutions to obtain a monomer mixed s...

Embodiment 2

[0039] The method for preparing an agricultural water-retaining agent with a slow-release function of chemical fertilizer from tanning waste leather leftovers comprises the following steps:

[0040] (1). Pretreatment: dry and pulverize the waste tanning leather scraps, and pass through a 100-mesh sieve; add 15 wt% ammonia water and 5 parts of potassium hydroxide mixed solution to 1 part of tanning waste leather scraps, and hydrolyze at a temperature of 60°C 60min to obtain collagen hydrolyzate;

[0041] (2). At room temperature, add 15 parts of acrylic acid to 10 wt% ammonium bicarbonate, ammonia water, potassium bicarbonate mixed solution, so that the neutralization degree of acrylic acid reaches 70%; add 25 wt% ammonium bicarbonate, ammonia water, potassium bicarbonate Add 10 parts of maleic anhydride to the mixed solution, so that the degree of neutralization of the maleic anhydride is 45%; mix the treated acrylic acid and maleic anhydride solutions to obtain a monomer mixe...

Embodiment 3

[0044] The method for preparing an agricultural water-retaining agent with a slow-release function of chemical fertilizer from tanning waste leather leftovers comprises the following steps:

[0045] (1). Pretreatment: dry and pulverize the leather solid waste, and pass through a 100-mesh sieve; add 20 wt% ammonia water and 10 parts of potassium hydroxide mixed solution to 10 parts of the leather solid waste, and hydrolyze at a temperature of 80° C. for 80 minutes, Obtain collagen hydrolyzate;

[0046] (2). At room temperature, add 15 wt% of ammonium bicarbonate, ammonia water, and potassium bicarbonate mixture to 20 parts of acrylic acid, so that the neutralization degree of acrylic acid reaches 65%; Add 15 parts of maleic anhydride to the mixed solution, so that the degree of neutralization of the maleic anhydride is 50%; mix the treated acrylic acid and maleic anhydride solutions to obtain a monomer mixed solution;

[0047] (3). Add the monomer mixed solution into the colla...

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Abstract

The invention discloses a method for preparing an agricultural water retaining agent having a nitrogen and potassium fertilizer slow release function from leather making waste leather scraps. The method is characterized in that a water retention and slow release fertilizer is prepared from, by weight, 1-10 parts of collagen hydrolysate, 5-20 parts of acrylic acid, 1-10 parts of maleic anhydride and 15-25 parts of a 20wt% NK mixed liquor through initiation, cross-linking, grafting and copolymerization. The prepared water retention and slow release fertilizer has excellent water retention and fertilizer conservation performances, has a deionized water absorption rate of 2000-2500 times (the maximum reported in water retention and slow release fertilizer related literatures), has a potassium ion content of 15-25% and a total nitrogen content of 5-10%, and has the effects of a 'small water reservoir' and a 'fertilizer storehouse'.

Description

technical field [0001] The invention relates to a method for preparing an agricultural water-retaining agent with the slow-release function of nitrogen and potassium fertilizers from tanning waste leather leftovers, and belongs to the field of chemical and metallurgical fertilizer manufacturing. Background technique [0002] my country is a large agricultural country, but agricultural non-point source pollution is generally not optimistic, with many types and wide distribution of pollution. On the one hand, my country is a country seriously short of water in the world, and the dry land without irrigation conditions accounts for about 60% of the cultivated land; on the other hand, the seasonal utilization rate of nitrogen fertilizer in my country is only about 30%-35%, and potassium fertilizer is about 35%. -45%, low fertilizer utilization rate not only causes huge economic losses, but also causes serious environmental pollution problems. Regarding the problem of agricultural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/06C08F222/06C05G3/06C05G3/08C05G3/70C05G3/90
Inventor 王茹胡再银唐余玲易守红
Owner SICHUAN UNIV
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