CN111054316A - Preparation method of organic-inorganic water-retaining agent for agricultural and forestry crops - Google Patents

Preparation method of organic-inorganic water-retaining agent for agricultural and forestry crops Download PDF

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CN111054316A
CN111054316A CN201911294654.9A CN201911294654A CN111054316A CN 111054316 A CN111054316 A CN 111054316A CN 201911294654 A CN201911294654 A CN 201911294654A CN 111054316 A CN111054316 A CN 111054316A
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retaining agent
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张淼
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Anhui Yunzhishu Technology Co Ltd
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    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/264—Synthetic macromolecular compounds derived from different types of monomers, e.g. linear or branched copolymers, block copolymers, graft copolymers
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16—Alumino-silicates
    • B01J20/165—Natural alumino-silicates, e.g. zeolites
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract

The invention provides a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops, relating to the technical field of water-retaining agents and comprising the following steps: adding acrylamide and sodium hydroxide solution into a reactor, reducing the temperature of the system to 0-5 ℃, then adding zeolite powder, a porous mineral-based material, acrylic acid, N-N methylene-bis-propionamide and potassium persulfate, stirring at 0-5 ℃ for 5-10 min, introducing inert gas, slowly heating to 30-35 ℃, stirring for 15-20 min, slowly heating to 65-70 ℃ for reaction, after reacting for 130-150 min, cleaning the product with distilled water, and drying, crushing and sieving the product to obtain the catalyst; the water-retaining agent prepared by the method combines the characteristics of organic poly (acrylic acid-acrylamide), inorganic zeolite powder and porous mineral-based materials and has the advantages of good water absorption and retention performance, good temperature resistance and salt tolerance and good use effect through an optimized process.

Description

Preparation method of organic-inorganic water-retaining agent for agricultural and forestry crops
Technical Field
The invention relates to the technical field of water-retaining agents, and particularly relates to a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops.
Background
In recent years, under the background of rapid development of economy, the ecological environment is greatly challenged, environmental problems frequently occur, the daily life of people is seriously affected, and the attention of people to the ecological problems is promoted to be increasingly strengthened.
China is a country with large area in arid and semiarid regions, and arid water shortage and soil degradation caused by the arid water shortage are important factors for restricting sustainable development of agriculture. Agriculture is considered as a large household for water consumption of national economy, and the development of water-saving agriculture is one of important strategies for long-term development of China in future. Among a plurality of water-saving agricultural technical measures, the research, development and use of chemical water-retention materials are ideal materials for developing water-saving agriculture in arid regions. Has wide application and development prospect in various aspects such as agricultural production and the like.
The water retention agent refers to a resin type macromolecular chemical molecular material with high water absorption performance. The action mechanism of the water retention agent is that the macromolecular chemical materials contain a plurality of groups with strong hydrophilic function, the groups can generate high-permeability association action in the resin, and simultaneously, the internal mesh structure is utilized to absorb a large amount of water, the water is in a gel state without dissolving after absorbing the water, and the water retention agent can usually absorb pure water with the weight which is hundreds to thousands times of the weight of the water retention agent. Under the action of cell concentration, root system pressure, transpiration tension and the like, the water-retaining agent can absorb a large amount of water from soil, so that important guarantee is provided for the water and nutrient requirements of plants. The water-retaining agent has good effects of improving the soil water retention capacity of arid regions, improving the soil structure, reducing water leakage to the deep layer and soil nutrient loss, so that the water-retaining agent is widely applied to water-saving agriculture and ecological environment restoration.
The water-retaining agent commonly used at present is a chemical organic water-retaining agent, which has good water-retaining effect, but is easy to cause soil hardening after long-term use, so that the chemical organic water-retaining agent can be compounded with inorganic water-retaining substances, and the water-retaining agent can retain water and play a certain improvement role in soil.
Chinese patent with application number 201510495492.0 discloses a preparation method of a shell carbon-based water-retaining agent, which comprises the following steps: diluting an acrylic acid monomer to 50% by mass with deionized water, carbonizing rice hulls, crushing, mixing with a water-soluble acrylic acid monomer, neutralizing with a NaOH aqueous solution, sequentially adding an additive, a cross-linking agent and an initiator, wherein the additive is acrylamide, the cross-linking agent is N, N' -methylene bisacrylamide, the initiator is ammonium persulfate, polymerizing for 30-45 minutes at 70-80 ℃, placing a polymer in an oven at 85 ℃ for polymerization reaction for 3 hours, crushing, and sieving with a 60-mesh sieve to obtain the offwhite rice hull carbon-based water-retaining agent. The rice hull carbon-based water-retaining agent prepared by the invention has better adsorption capacity for water with wider pH value and can be used for natural rainwater. The water-retaining agent combines organic poly (acrylic acid-acrylamide) and inorganic carbonized rice hulls, has good water-retaining effect, but needs to be further improved for improving soil.
Disclosure of Invention
The invention aims to provide an organic-inorganic water-retaining agent for agricultural and forestry crops and a preparation method thereof, wherein the characteristics of organic poly (acrylic acid-acrylamide), inorganic zeolite powder and a porous mineral-based material are combined, and the prepared water-retaining agent has good water absorption and retention performance, good temperature resistance and salt tolerance and good use effect through an optimized process.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding acrylamide and a sodium hydroxide solution into a reactor, reducing the temperature of the system to 0-5 ℃, then adding zeolite powder, a porous mineral-based material, acrylic acid, N-N methylene-bis-propionamide and potassium persulfate, stirring at 0-5 ℃ for 5-10 min, introducing inert gas, slowly heating to 30-35 ℃, stirring for 15-20 min, slowly heating to 65-70 ℃ for reaction, after reaction for 130-150 min, cleaning the product with distilled water, and drying, crushing and sieving the product to obtain the catalyst.
Preferably, the mass ratio of acrylamide to acrylic acid is 1: 1.2-2; the adding amount of the N-N methylene dipropionamide and the potassium persulfate is 3-4% and 7.5-10% of the amount of the acrylamide respectively; the adding amount of the sodium hydroxide is 50-80 times of the amount of the acrylamide, and the mass concentration of the sodium hydroxide is 1.3-1.6%.
Preferably, the adding amount of the zeolite powder is 2-5% of the amount of acrylamide; the addition amount of the porous mineral-based material is 20-60% of the amount of acrylamide.
Preferably, the adding amount of the zeolite powder is 3% of the amount of acrylamide; the amount of the porous mineral-based material added is 35% of the amount of acrylamide.
Preferably, the particle size of the zeolite powder is 1-20 μm.
Preferably, the porous mineral-based material is prepared by: uniformly mixing 8-15 parts of attapulgite powder, 4-9 parts of diatomite powder, 3-7 parts of limestone powder, 2-3 parts of a binder and a proper amount of water to prepare particles with the particle size of 1-10 mm, drying, and roasting in a muffle furnace at the roasting temperature of 750-800 ℃ for 3 hours; cooling to room temperature after baking and sintering, and sieving with a 80-100 mesh sieve after crushing to obtain a porous mineral-based material; the grain diameter of the raised soil powder is less than or equal to 50 mu m; the particle size of the zeolite powder is less than or equal to 50 mu m; the particle size of the limestone powder is less than or equal to 50 mu m.
Preferably, the binder is sodium hydroxypropyl cellulose or sodium carboxymethyl cellulose.
Preferably, the drying temperature is 70-80 ℃.
Preferably, the number of the screening meshes is 5-10 meshes.
The invention has the beneficial effects that:
the porous mineral base material added in the invention is obtained by mixing and calcining the specific concave-convex bar, diatomite and limestone, has light weight and large specific surface area, and can graft and modify poly (acrylic acid-acrylamide) in the process of preparing the water-retaining agent, thereby enhancing the stability of the water-retaining agent and increasing the functionality of the water-retaining agent. The porous mineral-based material has a good adsorption effect on water in soil, and can also adsorb heavy metal ions in soil, improve the soil structure and improve the soil fertility. The zeolite powder is added to slowly release nitrogen, phosphorus, potassium, mineralized trace elements and trace element lamps, so that the soil capability is improved, and a certain water and fertilizer retention effect is achieved.
The zeolite powder and the porous mineral-based material can absorb certain moisture after absorbing water, and can slowly release water at later stage, so that the water-absorbing and water-retaining capacity is strong, and the water-retaining agent is very suitable for agricultural and forestry crops.
The water-retaining agent prepared by the method is good in water absorption and retention performance, good in temperature resistance and salt tolerance and good in application effect in soil conservation by combining the characteristics of organic poly (acrylic acid-acrylamide), inorganic zeolite powder and a porous mineral-based material and by an optimized process.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 70 parts of sodium hydroxide solution with the mass concentration of 1.5% into a reactor, reducing the temperature of the system to 2 ℃, then adding 0.03 part of zeolite powder (the particle size is 1-20 mu m), 0.3 part of porous mineral-based material, 1.5 parts of acrylic acid, 0.035 part of N-N methylene-bis-propionamide and 0.08 part of potassium persulfate, stirring for 6min at the temperature of 2 ℃, introducing inert gas, slowly heating to 30 ℃, stirring for 180min, slowly heating to 65 ℃ for reaction, after reaction for 140min, cleaning the product by using distilled water, drying the product at the temperature of 70 ℃, crushing and sieving by a 5-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 10 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 6 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 5 parts of limestone powder (the particle size is less than or equal to 50 mu m), 3 parts of sodium hydroxypropyl cellulose and a proper amount of water to prepare particles with the particle size of 5mm, drying, and then placing in a muffle furnace for roasting at the roasting temperature of 760 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 80-mesh sieve to obtain the porous mineral-based material.
Example 2:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 75 parts of sodium hydroxide solution with the mass concentration of 1.5% into a reactor, reducing the temperature of the system to 0 ℃, then adding 0.05 part of zeolite powder (the particle size is 1-20 mu m), 0.3 part of porous mineral-based material, 1.5 parts of acrylic acid, 0.03 part of N-N methylene-bis-propionamide and 0.075 part of potassium persulfate, stirring for 10min at 0 ℃, introducing inert gas, slowly heating to 32 ℃, stirring for 20min, slowly heating to 70 ℃ for reaction, after reacting for 145min, cleaning the product with distilled water, drying the product at 80 ℃, crushing, and sieving with an 8-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 11 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 6 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 6 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2.5 parts of sodium carboxymethylcellulose and a proper amount of water to prepare particles with the particle size of 7mm, drying, and then placing in a muffle furnace for roasting at 780 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 100-mesh sieve to obtain the porous mineral-based material.
Example 3:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 60 parts of sodium hydroxide solution with the mass concentration of 1.5% into a reactor, reducing the temperature of the system to 2 ℃, then adding 0.03 part of zeolite powder (the particle size is 1-20 mu m), 0.35 part of porous mineral-based material, 1.6 parts of acrylic acid, 0.04 part of N-N methylene-bis-propionamide and 0.08 part of potassium persulfate, stirring for 8min at the temperature of 2 ℃, introducing inert gas, slowly heating to 32 ℃, stirring for 18min, slowly heating to 68 ℃ for reaction, after the reaction is carried out for 140min, cleaning the product by using distilled water, drying the product at the temperature of 75 ℃, crushing, and sieving by a 6-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 13 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 7 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 6 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2 parts of sodium carboxymethylcellulose and a proper amount of water to prepare particles with the particle size of 5mm, drying, and then placing in a muffle furnace for roasting at the roasting temperature of 760 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 90-mesh sieve to obtain the porous mineral-based material.
Example 4:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 80 parts of sodium hydroxide solution with the mass concentration of 1.35% into a reactor, reducing the temperature of the system to 0 ℃, then adding 0.02 part of zeolite powder (the particle size is 1-20 mu m), 0.5 part of porous mineral-based material, 1.8 parts of acrylic acid, 0.03 part of N-N methylene-bis-propionamide and 0.075 part of potassium persulfate, stirring for 10min at 0 ℃, introducing inert gas, slowly heating to 30 ℃, stirring for 20min, slowly heating to 70 ℃ for reaction, after reacting for 130min, cleaning the product with distilled water, drying the product at 75 ℃, crushing, and sieving with an 8-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 15 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 4 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 6 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2 parts of sodium hydroxypropyl cellulose and a proper amount of water to prepare particles with the particle size of 1mm, drying, and then placing in a muffle furnace for roasting at 780 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 100-mesh sieve to obtain the porous mineral-based material.
Example 5:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 50 parts of sodium hydroxide solution with the mass concentration of 1.3% into a reactor, reducing the temperature of the system to 5 ℃, then adding 0.05 part of zeolite powder (the particle size is 1-20 mu m), 0.2 part of porous mineral-based material, 1.2 parts of acrylic acid, 0.04 part of N-N methylene-bis-propionamide and 0.1 part of potassium persulfate, stirring for 8min at 5 ℃, introducing inert gas, slowly heating to 35 ℃, stirring for 15min, slowly heating to 65 ℃ for reaction, after reaction for 150min, cleaning the product with distilled water, drying the product at 70 ℃, crushing, and sieving with a 5-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 8 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 8 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 3 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2 parts of sodium carboxymethylcellulose and a proper amount of water to prepare particles with the particle size of 10mm, drying, and roasting in a muffle furnace at the roasting temperature of 750 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 80-mesh sieve to obtain the porous mineral-based material.
Example 6:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 70 parts of sodium hydroxide solution with the mass concentration of 1.6% into a reactor, reducing the temperature of the system to 3 ℃, then adding 0.03 part of zeolite powder (the particle size is 1-20 mu m), 0.6 part of porous mineral-based material, 2 parts of acrylic acid, 0.035 part of N-N methylene-bis-propionamide and 0.08 part of potassium persulfate, stirring for 5min at 3 ℃, introducing inert gas, slowly heating to 32 ℃, stirring for 18min, slowly heating to 68 ℃ for reaction, after reacting for 140min, cleaning the product by using distilled water, drying the product at 80 ℃, crushing, and sieving by a 10-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 11 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 9 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 7 parts of limestone powder (the particle size is less than or equal to 50 mu m), 3 parts of sodium hydroxypropyl cellulose and a proper amount of water to prepare particles with the particle size of 7mm, drying, and then placing in a muffle furnace for roasting at the roasting temperature of 800 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 100-mesh sieve to obtain the porous mineral-based material.
Example 7:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 65 parts of sodium hydroxide solution with the mass concentration of 1.5% into a reactor, reducing the temperature of the system to 0 ℃, then adding 0.03 part of zeolite powder (the particle size is 1-20 mu m), 0.35 part of porous mineral-based material, 1.5 parts of acrylic acid, 0.035 part of N-N methylene-bis-propionamide and 0.08 part of potassium persulfate, stirring for 8min at 0 ℃, introducing inert gas, slowly heating to 30 ℃, stirring for 18min, slowly heating to 65 ℃ for reaction, after reaction for 140min, cleaning the product with distilled water, drying the product at 75 ℃, crushing and sieving with a 5-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 12 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 7 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 5 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2 parts of sodium carboxymethylcellulose and a proper amount of water to prepare particles with the particle size of 5mm, drying, and roasting in a muffle furnace at the roasting temperature of 750 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 80-mesh sieve to obtain the porous mineral-based material.
Example 8:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 60 parts of sodium hydroxide solution with the mass concentration of 1.4% into a reactor, reducing the temperature of the system to 2 ℃, then adding 0.025 part of zeolite powder (the particle size is 1-20 mu m), 0.4 part of porous mineral-based material, 1.5 parts of acrylic acid, 0.03 part of N-N methylene-bis-propionamide and 0.08 part of potassium persulfate, stirring for 8min at the temperature of 2 ℃, introducing inert gas, slowly heating to 30 ℃, stirring for 20min, slowly heating to 68 ℃ for reaction, after reacting for 135min, cleaning the product by using distilled water, drying the product at the temperature of 75 ℃, crushing, and sieving by using a sieve of 8 meshes to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 10 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 8 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 5 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2.5 parts of sodium hydroxypropyl cellulose and a proper amount of water to prepare particles with the particle size of 5mm, drying, and then placing in a muffle furnace for roasting at the roasting temperature of 760 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 80-mesh sieve to obtain the porous mineral-based material.
Example 9:
a preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops comprises the following steps: adding 1 part of acrylamide and 50 parts of sodium hydroxide solution with the mass concentration of 1.6% into a reactor, reducing the temperature of the system to 5 ℃, then adding 0.02 part of zeolite powder (the particle size is 1-20 mu m), 0.6 part of porous mineral-based material, 1.5 parts of acrylic acid, 0.03 part of N-N methylene-bis-propionamide and 0.1 part of potassium persulfate, stirring for 5min at 5 ℃, introducing inert gas, slowly heating to 35 ℃, stirring for 20min, slowly heating to 70 ℃ for reaction, after reacting for 135min, cleaning the product by using distilled water, drying the product at 75 ℃, crushing, and sieving by a 6-mesh sieve to obtain the product.
The porous mineral-based material is prepared by the following method: uniformly mixing 12 parts of attapulgite powder (the particle size is less than or equal to 50 mu m), 8 parts of diatomite powder (the particle size is less than or equal to 50 mu m), 7 parts of limestone powder (the particle size is less than or equal to 50 mu m), 2 parts of sodium carboxymethylcellulose and a proper amount of water to prepare particles with the particle size of 10mm, drying, and roasting in a muffle furnace at the roasting temperature of 800 ℃ for 3 hours; after baking and sintering, cooling to room temperature, crushing and sieving with a 80-mesh sieve to obtain the porous mineral-based material.
Water absorption capacity test:
weighing 1g of water-retaining agent, placing in a bucket, adding 5L of distilled water or 0.9% saline water, standing for 1h, pouring the sample of water-retaining agent into a filter bag, naturally filtering for 20min, weighing, and measuringThe water absorption capacity Q (g/g) was calculated. Q ═ m1-m2)/m1. Wherein m is1M is the total mass of the water-retaining agent after water absorption2Is the total mass of the water retention agent sample.
(1) The water absorption capacity Q (g/g) of the water-retaining agent prepared in each example when 5L of distilled water was added is shown in Table 1.
TABLE 1 Water absorption Capacity of Water-retaining agent in distilled Water
Examples Water absorption Rate Q (g/g)
Example 1 658
Example 2 669
Example 3 663
Example 4 631
Example 5 682
Example 6 610
Example 7 641
Example 8 637
Example 9 597
As can be seen from Table 1, the water retention agents in examples 1 to 9 of the present invention have good water retention performance for distilled water.
(2) The water absorption capacity Q (g/g) of the water-retaining agent prepared in each example when 5L of 0.9% saline was added is shown in Table 2.
TABLE 2 Water absorption Capacity of Water-retaining agent in brine
Examples Water absorption Rate Q (g/g)
Example 1 73
Example 2 76
Example 3 79
Example 4 69
Example 5 75
Example 6 71
Example 7 75
Example 8 73
Example 9 68
As shown in Table 2, the water retention agents in examples 1 to 9 of the present invention have good water retention performance for saline water.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A preparation method of an organic-inorganic water-retaining agent for agricultural and forestry crops is characterized by comprising the following steps: adding acrylamide and a sodium hydroxide solution into a reactor, reducing the temperature of the system to 0-5 ℃, then adding zeolite powder, a porous mineral-based material, acrylic acid, N-N methylene-bis-propionamide and potassium persulfate, stirring at 0-5 ℃ for 5-10 min, introducing inert gas, slowly heating to 30-35 ℃, stirring for 15-20 min, slowly heating to 65-70 ℃ for reaction, after reaction for 130-150 min, cleaning the product with distilled water, and drying, crushing and sieving the product to obtain the catalyst.
2. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 1, wherein the mass ratio of the acrylamide to the acrylic acid is 1: 1.2-2; the adding amount of the N-N methylene dipropionamide and the potassium persulfate is 3-4% and 7.5-10% of the amount of the acrylamide respectively; the adding amount of the sodium hydroxide is 50-80 times of the amount of the acrylamide, and the mass concentration of the sodium hydroxide is 1.3-1.6%.
3. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 1, wherein the amount of the zeolite powder added is 2-5% of the amount of acrylamide; the addition amount of the porous mineral-based material is 20-60% of the amount of acrylamide.
4. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 3, wherein the amount of the zeolite powder added is 3% of the amount of acrylamide; the amount of the porous mineral-based material added is 35% of the amount of acrylamide.
5. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 1, wherein the particle size of the zeolite powder is 1-20 μm.
6. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 1, wherein the porous mineral-based material is prepared by the following method: uniformly mixing 8-15 parts of attapulgite powder, 4-9 parts of diatomite powder, 3-7 parts of limestone powder, 2-3 parts of a binder and a proper amount of water to prepare particles with the particle size of 1-10 mm, drying, and roasting in a muffle furnace at the roasting temperature of 750-800 ℃ for 3 hours; cooling to room temperature after baking and sintering, and sieving with a 80-100 mesh sieve after crushing to obtain a porous mineral-based material; the grain diameter of the raised soil powder is less than or equal to 50 mu m; the particle size of the zeolite powder is less than or equal to 50 mu m; the particle size of the limestone powder is less than or equal to 50 mu m.
7. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 6, wherein the binder is sodium hydroxypropyl cellulose or sodium carboxymethyl cellulose.
8. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 1, wherein the drying temperature is 70-80 ℃.
9. The preparation method of the organic-inorganic water-retaining agent for agricultural and forestry crops as claimed in claim 1, wherein the sieve mesh number is 5-10 meshes.
10. The application of the organic-inorganic water retention agent prepared according to any one of claims 1-9 in soil water retention.
CN201911294654.9A 2019-12-16 2019-12-16 Preparation method of organic-inorganic water-retaining agent for agricultural and forestry crops Withdrawn CN111054316A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112745458A (en) * 2020-12-30 2021-05-04 四川省新兰月生物科技有限公司 Water-retaining agent for enhancing stress resistance and preparation method thereof
CN113355103A (en) * 2021-06-28 2021-09-07 内蒙古农业大学 Porous material for desert afforestation water retention and preparation method thereof
CN114478963A (en) * 2021-12-23 2022-05-13 广西精典化工新材料有限公司 Synthesis of zeolite molecular sieve copolymer water-retaining agent for desert control
CN116855258A (en) * 2023-07-10 2023-10-10 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) Salt-resistant agricultural water-retaining agent and preparation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112745458A (en) * 2020-12-30 2021-05-04 四川省新兰月生物科技有限公司 Water-retaining agent for enhancing stress resistance and preparation method thereof
CN113355103A (en) * 2021-06-28 2021-09-07 内蒙古农业大学 Porous material for desert afforestation water retention and preparation method thereof
CN114478963A (en) * 2021-12-23 2022-05-13 广西精典化工新材料有限公司 Synthesis of zeolite molecular sieve copolymer water-retaining agent for desert control
CN116855258A (en) * 2023-07-10 2023-10-10 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) Salt-resistant agricultural water-retaining agent and preparation method thereof
CN116855258B (en) * 2023-07-10 2024-05-03 贵州省土壤肥料研究所(贵州省生态农业工程技术研究中心)(贵州省农业资源与环境研究所) Salt-resistant agricultural water-retaining agent and preparation method thereof

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