CN108948293B - Humic acid-based composite water-retaining agent and preparation method thereof - Google Patents
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Abstract
The invention belongs to the technical field of water-absorbing resin, and relates to a humic acid based composite water-retaining agent, which solves the technical problems of high cost, poor salt resistance and poor water-retaining property of the existing agricultural water-retaining agent. The humic acid based composite water retaining agent is characterized by comprising the following raw materials in parts by weight: 1 to 5 portions of potassium humate, 20 portions of acrylic acid, 8 to 14 portions of potassium hydroxide, 1 to 5 portions of 2-acrylamide-2-methylpropanesulfonic acid, 100 to 160 portions of cyclohexane, 1 to 2 portions of dispersant, 0.1 to 0.5 portion of initiator, 0.008 to 0.05 portion of water-soluble cross-linking agent, 0.008 to 0.04 portion of oil-soluble cross-linking agent, 0.02 to 0.1 portion of coupling agent, 0.2 to 5 portions of bentonite and 0.2 to 5 portions of kaolin. The invention also provides a preparation method of the humic acid based composite water retaining agent.
Description
Technical Field
The invention belongs to the technical field of water-absorbing resin, and particularly relates to a humic acid based composite water-retaining agent and a preparation method thereof.
Background
China is a country with large area in semiarid, arid and desert regions, and arid water shortage and land degradation caused by the arid water shortage are one of important factors for restricting sustainable development of agriculture. Effectively implements water-saving measures for dry land agriculture, actively develops agricultural water-saving and soil moisture conservation technologies, scientifically utilizes limited regional water resources, is not only a necessary way for modern dry land agricultural development, but also is a great problem for organic reconstruction of soil bodies in arid regions.
The water-retaining agent is a macromolecule water-absorbing gel which is appropriately crosslinked and can be highly expanded and has a complex network structure, can absorb water which is hundreds to thousands times of the weight of the water-retaining gel, and has extremely strong water-retaining property, so the water-retaining agent is attractive in miniature water storage reservoirs, can enhance the water-absorbing capacity and water-absorbing rate of soil bodies, and can slowly release most of the absorbed water to be supplied to plants for utilization; in addition, the water-retaining agent is applied to the soil body, so that the formation of soil aggregates can be promoted, the porosity is increased, and the water, gas and heat conditions in the soil body are optimized; and the water-retaining agent has the functions of ion exchange, adsorption and the like, can perform ion exchange with ions in the fertilizer, effectively improves the fertilizer retention property, and increases the utilization rate of the fertilizer, so the water-retaining agent is widely applied to the fields of agricultural water conservation, desertification land treatment and the like.
At present, synthetic polymer water retention agents are the most rapidly developed, the most varieties of water retention agents are produced, the industrial yield is the largest, mainly comprising polyacrylic acid, polyacrylamide and the like, the water retention agents have excellent water absorption and retention properties and good stability, the effective period of the water retention agents in soil is 3 years under general conditions, however, the water retention agents are high in price and poor in salt tolerance, so that the application prospect of the water retention agents is greatly limited, and the water retention agents are difficult to be used for field crops.
In the agricultural water-retaining agent, on the premise of ensuring the water absorption and retention performance of the water-retaining agent, the research on how to reduce the production cost of the water-retaining agent and improve the salt tolerance of the water-retaining agent is very necessary for improving the use value of the water-retaining agent, and the composite water-retaining agent is generated under the condition. The composite water-retaining agent is prepared by introducing some cheap inorganic clay such as kaolin, montmorillonite, attapulgite, vermiculite, bentonite and the like into a three-dimensional structure of water-absorbent resin, wherein the inorganic clay not only can endow the water-absorbent resin with excellent water-absorbing and water-retaining properties, but also can improve the salt resistance of the water-retaining agent and reduce the production cost of the water-retaining agent to a certain extent. However, the main raw materials of the existing composite water-retaining agent still mainly comprise acrylic acid and acrylamide, so that the production cost is difficult to be greatly reduced, and the practical use of the composite water-retaining agent is still limited.
Humic acid is a complex polymer hydrophilic colloid with a three-dimensional space structure, and the molecular weight is as small as hundreds and millions; humic acid has unique physical, chemical and physiological characteristics of adsorption, ion exchange, chelation (complexation), redox, physiological regulation of root system and the like, and is low in price, so that the humic acid is widely applied to the fields of industry and agriculture, medicines, environment and the like. The Chinese patent application with the patent application number of 201610656500.X and the invention name of a method for preparing sodium humate-acrylic acid-ethanolamine salt-resistant super absorbent resin discloses a method for preparing sodium humate salt-resistant super absorbent resin by adopting an inverse suspension polymerization method, and the production cost is greatly reduced because the prepared super absorbent resin contains about 15-20% of sodium humate; however, the water retention is still to be further improved.
Disclosure of Invention
The invention aims to provide a humic acid based composite water-retaining agent and a preparation method thereof, wherein two kinds of clay are added in the water-retaining agent structure through in-situ polymerization, surface crosslinking and surface coating modification technologies to form the humic acid based composite water-retaining agent with an internal loose crosslinking and external close crosslinking core-shell structure, so as to solve the technical problems of high cost, and poor salt tolerance and water retention performance of the existing agricultural water-retaining agent.
The technical scheme adopted by the invention is that the humic acid based composite water-retaining agent is characterized by comprising the following raw materials in parts by weight: 1-5 parts of potassium humate, 20 parts of acrylic acid, 8-14 parts of potassium hydroxide, 1-5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 100-160 parts of cyclohexane, 1-2 parts of a dispersant, 0.1-0.5 part of an initiator, 0.008-0.05 part of a water-soluble cross-linking agent, 0.008-0.04 part of an oil-soluble cross-linking agent, 0.02-0.1 part of a coupling agent, 0.2-5 parts of bentonite and 0.2-5 parts of kaolin;
the preparation method comprises the following steps:
step 1: preparing the potassium humate into a potassium humate water solution with the mass fraction of 20-30% according to the weight parts, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 20-40% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 50-90% in an ice-water bath below 14 ℃ according to the parts by weight for later use;
step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent according to the parts by weight, and uniformly stirring by ultrasonic waves to obtain a suspension liquid, thereby obtaining a water phase for later use;
and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 15-30 min to obtain an oil phase for later use;
and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 800-1000 rpm, keeping stirring for 10-15 min, then adjusting the stirring speed to 200-500 rpm, heating to 60-67 ℃, and then carrying out heat preservation reaction for 1.0-2.0 h;
and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h;
step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
Further, the bentonite is sodium bentonite or calcium bentonite.
Further, in order to ensure better water absorption rate, the bentonite is 100-300 meshes.
Further, the initiator is potassium persulfate or ammonium persulfate.
Further, in order to stabilize the reaction, the dispersant is prepared by mixing Span80 (namely Span80, the chemical component is sorbitan fatty acid ester.) and Tween80 (namely sorbitan monooleate polyoxyethylene ether.) in a mass ratio of 1: (0.5-1) a double dispersant obtained by mixing.
Further, the water-soluble cross-linking agent is N, N-methylene-bis-ammonium acrylate or polyethylene glycol diacrylate.
Further, the oil-soluble crosslinking agent is epichlorohydrin or ethylene glycol dimethacrylate or divinylbenzene.
Further, the coupling agent is 3- (2, 3-glycidoxy) propyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, aniline methyl triethoxysilane or 3-methacryloxypropyltrimethoxysilane.
The invention has the beneficial effects that:
(1) according to the water-retaining agent disclosed by the invention, potassium humate is used as one of main raw materials for preparing the water-retaining agent, and two kinds of clay, namely bentonite and kaolin, are introduced into a three-dimensional structure of the humic acid-based water-retaining agent, so that the production cost of the water-retaining agent is reduced by about 10%, and the technical problem that the existing agricultural water-retaining agent is high in cost is solved.
(2) According to the water-retaining agent disclosed by the invention, two clays, namely bentonite and kaolin, are introduced into the raw materials, so that the salt resistance, the water retention property and the heat resistance of the water-retaining agent are improved, the action aging of the water-retaining agent is increased, and the comprehensive performance of the water-retaining agent is improved; therefore, the water-retaining agent of the invention solves the technical problem that the existing agricultural water-retaining agent has poor salt resistance and water retention performance.
(3) The invention also provides a preparation method of the humic acid based composite water-retaining agent, which takes cheap humic acid potassium and inorganic clay as raw materials, utilizes a reversed phase suspension method and a sampling step heating method, and prepares a composite water-retaining agent with a core-shell structure, wherein the interior of the composite water-retaining agent is properly crosslinked, and the exterior of the composite water-retaining agent is tightly crosslinked by in-situ polymerization, surface crosslinking and surface coating modification technologies; greatly improves the water retention property and the heat resistance of the water-retaining agent, prolongs the action aging of the water-retaining agent, and greatly reduces the production cost of the water-retaining agent.
Detailed Description
The humic acid based composite water-retaining agent of the invention comprises the following raw materials in parts by weight:
TABLE 1
Unit: portions are
In the above examples 1 to 3, the bentonite is sodium bentonite, the initiator is potassium persulfate, and the dispersant is Span80 and Tween80 in a mass ratio of 1: 1, the water-soluble cross-linking agent is N, N-methylene-bis-ammonium acrylate, the oil-soluble cross-linking agent is epichlorohydrin, the coupling agent is 3- (2, 3-epoxypropoxy) propyl trimethoxy silane, and the bentonite is 100 meshes.
In the above examples 3 to 6, the bentonite is calcium bentonite, the initiator is ammonium persulfate, and the dispersant is Span80 and Tween80 in a mass ratio of 1: 0.5, wherein the water-soluble cross-linking agent is polyethylene glycol diacrylate, the oil-soluble cross-linking agent is ethylene glycol dimethacrylate, the coupling agent is 3-aminopropyl triethoxysilane, and the bentonite is 300 meshes.
The preparation method of the humic acid based composite water retaining agent comprises the following steps of mixing the raw materials in parts by weight as listed in example 1 in Table 1:
step 1: preparing the potassium humate into a potassium humate water solution with the mass fraction of 30% according to the weight parts, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 30% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 70% in an ice-water bath at the temperature of below 14 ℃ for later use; step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent in parts by weight, and ultrasonically stirring the mixture uniformly to form a suspension to obtain a water phase for later use; and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 30min to obtain an oil phase for later use; and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 800rpm, keeping stirring for 15min, then adjusting the stirring speed to 300rpm, heating to 67 ℃, and then carrying out heat preservation reaction for 1.5 h; and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h; step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
The humic acid based composite water retaining agent is prepared from the following raw materials in parts by weight as listed in example 2 of Table 1:
step 1: preparing the potassium humate into a potassium humate water solution with the mass fraction of 20% according to the weight parts, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 40% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 80% in an ice-water bath at the temperature of below 14 ℃ for later use; step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent in parts by weight, and ultrasonically stirring the mixture uniformly to form a suspension to obtain a water phase for later use; and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 20min to obtain an oil phase for later use; and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 1000rpm, keeping stirring for 10min, then adjusting the stirring speed to 400rpm, heating to 60 ℃, and then carrying out heat preservation reaction for 2 h; and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h; step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
The humic acid based composite water retaining agent is prepared from the following raw materials in parts by weight as listed in example 3 of Table 1:
step 1: preparing the potassium humate into a 25% potassium humate aqueous solution by weight, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 20% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 60% in an ice-water bath at the temperature of below 14 ℃ for later use; step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent in parts by weight, and ultrasonically stirring the mixture uniformly to form a suspension to obtain a water phase for later use; and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 15min to obtain an oil phase for later use; and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 900rpm, keeping stirring for 13min, then adjusting the stirring speed to 200rpm, heating to 65 ℃, and then carrying out heat preservation reaction for 2 h; and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h; step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
The step of preparing the humic acid based composite water retaining agent according to the weight part ratio of the raw materials listed in the example 4 of the table 1 is the same as the step of preparing the humic acid based composite water retaining agent according to the weight part ratio of the raw materials listed in the example 1, except that the raw material ratio is different.
The humic acid based composite water retaining agent is prepared from the raw materials listed in example 5 of Table 1 in parts by weight as follows:
step 1: preparing the potassium humate into a potassium humate water solution with the mass fraction of 30% according to the weight parts, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 30% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 50% in an ice-water bath at the temperature of below 14 ℃ for later use; step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent in parts by weight, and ultrasonically stirring the mixture uniformly to form a suspension to obtain a water phase for later use; and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 15min to obtain an oil phase for later use; and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 850rpm, keeping stirring for 14min, adjusting the stirring speed to 500rpm, heating to 67 ℃, and then carrying out heat preservation reaction for 1 h; and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h; step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
The humic acid based composite water retaining agent is prepared from the raw materials listed in example 6 of Table 1 in parts by weight by the following specific steps:
step 1: preparing the potassium humate into a potassium humate water solution with the mass fraction of 30% according to the weight parts, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 30% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 90% in an ice-water bath at the temperature of below 14 ℃ for later use; step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent in parts by weight, and ultrasonically stirring the mixture uniformly to form a suspension to obtain a water phase for later use; and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 25min to obtain an oil phase for later use; and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 950rpm, keeping stirring for 12min, then adjusting the stirring speed to 400rpm, heating to 63 ℃, and then carrying out heat preservation reaction for 1.8 h; and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h; step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
The performance parameters of the humic acid based composite water retaining agent prepared in the embodiments 1 to 6 are specifically shown in the following table 2:
TABLE 2
As can be seen from the above Table 2, the water-retaining agent prepared by the preparation method of the invention has good salt resistance and water retention performance.
Claims (8)
1. The humic acid based composite water-retaining agent is characterized by comprising the following raw materials in parts by weight: 1-5 parts of potassium humate, 20 parts of acrylic acid, 8-14 parts of potassium hydroxide, 1-5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 100-160 parts of cyclohexane, 1-2 parts of a dispersant, 0.1-0.5 part of an initiator, 0.008-0.05 part of a water-soluble cross-linking agent, 0.008-0.04 part of an oil-soluble cross-linking agent, 0.02-0.1 part of a coupling agent, 0.2-5 parts of bentonite and 0.2-5 parts of kaolin;
the preparation method comprises the following steps:
step 1: preparing the potassium humate into a potassium humate water solution with the mass fraction of 20-30% according to the weight parts, and filtering and deslagging for later use; preparing potassium hydroxide into a potassium hydroxide solution with the mass fraction of 20-40% according to the parts by weight, and then preparing the acrylic acid and the prepared potassium hydroxide solution into a potassium acrylate aqueous solution with the neutralization degree of 50-90% in an ice-water bath below 14 ℃ according to the parts by weight for later use;
step 2: mixing the potassium humate aqueous solution and the potassium acrylate aqueous solution prepared in the step 1, and 2-acrylamide-2-methylpropanesulfonic acid, bentonite, an initiator and a water-soluble cross-linking agent according to the parts by weight, and uniformly stirring by ultrasonic waves to obtain a suspension liquid, thereby obtaining a water phase for later use;
and step 3: adding the cyclohexane and the dispersing agent in parts by weight into a reaction kettle, heating to 40 ℃ under the protection of nitrogen, and stirring for 15-30 min to obtain an oil phase for later use;
and 4, step 4: dropping the water phase prepared in the step 2 into the oil phase in the reaction kettle in the step 3 under the protection of nitrogen, adjusting the stirring speed to 800-1000 rpm, keeping stirring for 10-15 min, then adjusting the stirring speed to 200-500 rpm, heating to 60-67 ℃, and then carrying out heat preservation reaction for 1.0-2.0 h;
and 5: adding the oil-soluble cross-linking agent in parts by weight into the reaction kettle in the step 4, and continuing to react for 1 hour; mixing the kaolin and the coupling agent in parts by weight, adding the mixture into a reaction kettle, and reacting for 0.5 h;
step 6: turning off the heating source, cooling to room temperature by cooling water, stopping stirring, aging for 0.5h, taking out the reaction product, and washing with ethanol; and (3) placing the reaction product washed by the ethanol in an oven, setting the baking temperature of the oven at 100 ℃, baking for 12h, and then crushing and granulating to obtain the humic acid-based composite water-retaining agent.
2. The humic acid based composite water retaining agent according to claim 1, characterized in that: the bentonite is sodium bentonite or calcium bentonite.
3. The humic acid based composite water retaining agent according to claim 1 or 2, which is characterized in that: the bentonite is 100-300 meshes.
4. The humic acid based composite water retaining agent according to claim 1, characterized in that: the initiator is potassium persulfate or ammonium persulfate.
5. The humic acid based composite water retaining agent according to claim 1, characterized in that: the dispersing agent is prepared from Span80 and Tween80 according to the mass ratio of 1: 0.5 to 1 parts by weight of a dispersant.
6. The humic acid based composite water retaining agent according to claim 1, characterized in that: the water-soluble cross-linking agent is N, N-methylene-bis-ammonium acrylate or polyethylene glycol diacrylate.
7. The humic acid based composite water retaining agent according to claim 1, characterized in that: the oil-soluble cross-linking agent is epichlorohydrin or ethylene glycol dimethacrylate or divinylbenzene.
8. The humic acid based composite water retaining agent according to claim 1, characterized in that: the coupling agent is 3- (2, 3-epoxypropoxy) propyl trimethoxy silane or 3-aminopropyl triethoxy silane or 3-aminopropyl trimethoxy silane or aniline methyl triethoxy silane or 3-methacryloxypropyl trimethoxy silane.
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| CN112552925A (en) * | 2020-12-14 | 2021-03-26 | 北部湾海洋新材料研究院 | Drought-resistant water-retaining material for agriculture and forestry |
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