CN100549100C - Humate compound water retaining agent and preparation method thereof - Google Patents
Humate compound water retaining agent and preparation method thereof Download PDFInfo
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- CN100549100C CN100549100C CNB200510090363XA CN200510090363A CN100549100C CN 100549100 C CN100549100 C CN 100549100C CN B200510090363X A CNB200510090363X A CN B200510090363XA CN 200510090363 A CN200510090363 A CN 200510090363A CN 100549100 C CN100549100 C CN 100549100C
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Abstract
A kind of humate compound water retaining agent and preparation method thereof, it is characterized in that water-holding agent of the present invention is is raw material with the higher low rank coal of humic acids content, at first prepare humate with alkali solution technique, with disc type polymerization acrylic acid synthesizing-acrylamide copolymer, pass through surface treatment liquid then---be dissolved with the surface chemical reaction of the acetone soln of glycerol, by a certain percentage humate and acrylic acid-acrylamide copolymer are combined, be prepared into surface-crosslinked water preservation.The humate compound water retaining agent of this invention can be scattered in the water fast, equably, and water absorbent rate height, speed are fast, the electrolyte-resistant ability is strong; Humic acids can keep its stimulating plant that has to grow, improve the effect of soil nutrient situation, and effectively reduces the water-holding agent product cost, is specially adapted to prevent the improvement project of desertification and Desertification soil.
Description
Technical field
This invention relates to a kind of water-holding agent and preparation method thereof, a kind of humate compound water retaining agent and preparation method thereof particularly, be applicable to fields such as agricultural, forestry, water conservancy, sand industry keeping crop seedling from drought, increasing both production and income, improve the soil, check winds and fix drifting sand, soil conservation etc., also can be used for seed dressing, implement soilless culture etc.Humate compound water retaining agent has the plant nutrition of improvement situation and drought-relief dual function, can effectively promote plant-growth and improve water use efficiency.
Background technology
Water-holding agent is a kind of functional high molecule material with high-strength absorbing performance and high-strength water retention capacity.Because its excellent water absorbing properties is widely used in various fields such as farming, woods, gardening, health care, oil, chemical, daily necessities, environment protection, beauty and make-up, building materials, biochemical technology and food.The water-holding agent of the common use of agroforestry at present mostly is that chemical enterprise produces, and its cost height, to use specific aim not strong, function singleness.Though this class water-holding agent has higher receptivity to deionized water, because its electrolyte-resistant ability, rate of water absorption is low, is difficult to reach the suction requirement in actual applications, in the medium-term and long-term use of soil, also can cause soil compaction and pH value to raise; Other is synthetic to be water-holding agent such as polyacrylamide, polyvinyl alcohol etc., though the electrolyte-resistant ability is better, water absorbent rate is low, and the production cost height, is unsuitable for big area use in soil.
Summary of the invention
The purpose of patent of the present invention is in order to solve above existing problem, with the higher low rank coal of humic acids content is raw material, alkali solution technique prepares humate, disc type polymerization acrylic acid synthesizing-acrylamide copolymer super absorbent resin, realize surface-crosslinked chemical reaction by surface treatment liquid, humate and super absorbent resin acrylic acid-acrylamide copolymer are combined, be prepared into surface-crosslinked compound type water absorbent resin, i.e. humate compound water retaining agent.
Humic acids is the important substance that constitutes the soil nutrient composition, is distributed with various active functional groups such as carboxyl, hydroxyl, carbonyl in its structure.Choosing the low rank coal that is rich in humic acids is raw material, obtains humic acids salt material after purifying.With the low rank coal humate and acrylic acid-acrylamide copolymer is crosslinked combines, obtain humate compound water retaining agent.The low rank coal humate compound water retaining agent both can be brought into play the biological activity of humic acids in soil, can bring into play the saving water, resisting drought effect of water-holding agent again, thereby produce the dual function of drought-relief and promotion vegetation growth, simultaneously can reduce the production cost of absorbent resin by a relatively large margin, be fit to agricultural domain-specific water-holding agent and become.
When temperature surpassed 85 ℃, condensation can take place and lose its original biological activity in humic acids and humic acids salt material.So, must guarantee to be no more than 85 ℃ in the temperature of producing preparation humic acids salt material.But in the process of polyreaction, the temperature of reaction system all surpasses 85 ℃ usually, and can not guarantee the biological activity of humic acids salt material in the reactive polymeric system.Therefore, the present invention adopts first acrylic acid synthesizing-acrylamide copolymer, adds humate again, and makes the two compound preparation method by surface-crosslinked reaction, is not destroyed with the biological activity that guarantees humate.
Its purity of ingredient requirement of using for polymerization is very high, foreign matter content height in the coal humic acid, and it is relevant with the multiple factors such as the origin cause of formation, exploitation, transportation, storage and treatment process of coal, the kind of impurity be can not determine, wherein plurality of impurities is difficult removes totally, and these impurity have stronger inhibition to polyreaction.On the other hand, have more quinonyl structural unit in the humic acids macromolecular structure, itself just has very strong inhibition this structure.If humic acid substance is participated in polyreaction directly, will cause the reaction times long, energy consumption increases, and initiator amount increases, and product performance reduce, and along with humic acid substance content increases even can't carry out polyreaction.Only avoided the inhibition of humic acid substance could improve humic acids content in the water-holding agent, reduced product cost, and enhance product performance.But the various impurity of removing fully in the coal humic acid are impossible, and the inhibition that is caused for humic acids structure itself is difficult to overcome.So this patent has adopted the simplest and effectively overcome the method for humic acids inhibition disadvantageous effect, avoids humic acids to participate in copolyreaction directly exactly, adopt complex method that humic acids is combined with super absorbent resin.
Oxygen has very strong inhibition equally to polyreaction.Adopt disc type polymerization acrylic acid synthesizing-acrylamide copolymer, can avoid to a certain extent that reactant contacts with the continuous of air in the reaction process, reduce the chance that oxygen participates in copolyreaction, thereby reduce the disadvantageous effect of oxygen to copolyreaction, and reduction initiator amount, shorten the reaction times, obtain the higher acrylic acid-acrylamide copolymer of water absorbent rate; Simultaneously make that also the production technique of acrylic acid synthesizing-acrylamide copolymer is simple.
Hydrophilic small molecules acetone can improve the rate of water absorption of humate compound water retaining agent, makes it reach desired water absorbent rate at short notice; Glycerol not only can be used as surface crosslinking agent makes humate combine with acrylic acid-acrylamide copolymer, and the further variation of surface hydrophilicity functional group that can make humate compound water retaining agent of poly-hydroxy wherein, help improving its rate of water absorption and water absorbent rate.So, make surface treatment liquid by dissolving glycerol in acetone soln, with humate with acrylic acid-acrylamide copolymer is crosslinked combines, the acquisition humate compound water retaining agent.
Therefore, this patent is at first by alkali solution technique extracting low rank coal humate, again by disc type polymerization acrylic acid synthesizing-acrylamide copolymer, then by being dissolved with the acetone soln of glycerol, make humate and acrylic acid-acrylamide copolymer carry out surface-crosslinked reaction, be prepared into compound humic acids super absorbent resin, i.e. humate compound water retaining agent.Thereby can realize, the first, the biological activity of maintenance humate; The second, the diversity of increase surface functional group, the electrolyte-resistant performance and the rate of water absorption of raising humate compound water retaining agent; The 3rd, under the prerequisite that guarantees high water absorbent rate, increase cheap humate content, reduce initiator amount, increase the kinetic chain length of product, avoid the generation of inductive phase, shorten the reaction times, reduce energy consumption, with the product cost that realizes reducing super absorbent resin, the purpose of improving water absorbing properties, enhancing nutritive effect.
The present invention realizes in the following manner:
Water-holding agent of the present invention is to be raw material with the higher low rank coal of humic acids content, at first prepare humate with alkali solution technique, with disc type polymerization acrylic acid synthesizing-acrylamide copolymer, then by surface chemical reaction, humate and absorbent resin acrylic acid-acrylamide copolymer are combined, be prepared into surface-crosslinked compound type water absorbent resin, i.e. humate compound water retaining agent.
Humate and acrylic acid-acrylamide copolymer add surface treatment liquid and are prepared from 1: 1.5～5.5 ratio (weight ratio) in this water-holding agent.
Humate is by low rank coal 60～70g, water 200～450ml, 5g～6.5g highly basic such as NaOH or KOH, 0.4～0.6gNa
2CO
3, extracting is filtered, and oven dry obtains.
Acrylic acid-acrylamide copolymer is to be the neutralization of 30% sodium hydroxide solution by monomer vinylformic acid and concentration, adds acrylamide, linking agent, initiator polymerization and obtains, wherein monomer ratio (mol ratio): [AM]: [AA]=0.1: 1～0.2: 1; Dosage of crosslinking agent (mol ratio): [MBA]: ([AA]+[AM])=0.6 * 10
-4: 1～0.8 * 10
-4: 1; Initiator amount (mol ratio): [KSP]: ([AA]+[AM])=0.1 * 10
-3: 1～0.15 * 10
-3: 1.
Surface treatment liquid is made by aqueous acetone solution dissolving glycerol, wherein the glycerol consumption calculates with 0.002～0.004g by handling every gram acrylic acid-acrylamide copolymer, and the aqueous acetone solution consumption calculates with 1.5～3.5mL by every gram acrylic acid-acrylamide copolymer.
Linking agent can be selected N for use, N '-methylene-bisacrylamide, and initiator can be selected Potassium Persulphate K for use
2S
2O
8Solution.
The humate compound water retaining agent preparation method, it is characterized in that with the low rank coal being raw material, prepare humate with alkali solution technique, with disc type polymerization acrylic acid synthesizing-acrylamide copolymer,, humate and acrylic acid-acrylamide copolymer are combined then by surface chemical reaction, be prepared into surface-crosslinked water preservation, be humate compound water retaining agent, its synthetic method is: (1) puts into container with low rank coal, adds entry, highly basic such as NaOH (or KOH), Na
2CO
3Stir, at room temperature extracting 1.5～2.5h filters or suction filtration by B, and filtrate obtains humate such as Sodium salts humic acids or potassium humate solid product 70 ℃～80 ℃ oven dry down; (2) in container, add quantitative vinylformic acid in proportion, with concentration is that to be neutralized to degree of neutralization be 80% for 30% sodium hydroxide solution, add quantitative acrylamide, add linking agent (MBA) N again, after N '-methylene-bisacrylamide stirs, this container is placed ice-water bath, again with initiator potassium persulfate K
2S
2O
8Solution joins in the above-mentioned reactant, be modulated into and treat polymer fluid, to treat that polymer fluid pours in dish or the containers such as groove, make sample path length in dish or the containers such as groove less than 200mm, make it in 70 ℃～80 ℃ thermostat containers polymerization reaction take place 3-5 hour, and in vacuum drying oven, after (70 ℃～80 ℃) drying, get plate-like multipolymer, obtain Powdered acrylic acid-acrylamide copolymer after the fragmentation; (3) configuration aqueous acetone solution, the dissolving glycerol, make the aqueous acetone solution surface treatment liquid that is dissolved with glycerol, after acrylic acid-acrylamide copolymer and humate material mix in proportion, be added dropwise to surface treatment liquid, stir, make surface treatment liquid wetting material table face, put into vacuum drying oven and carried out surface-crosslinked reaction in 30～60 minutes, obtain humate compound water retaining agent.
Described humate is by low rank coal 60～70g, water 200～450ml, 5g～6.5g, highly basic such as NaOH or KOH, 0.4～0.6gNa
2CO
3, extracting is filtered, and oven dry obtains.
Described aqueous acetone solution concentration is 70%～80%, and the glycerol consumption calculates by handling every gram acrylic acid-acrylamide copolymer 0.002～0.004g, and the aqueous acetone solution consumption calculates with 1.5～3.5mL by every gram acrylic acid-acrylamide copolymer.
The thickness for the treatment of polymer fluid in the containers such as described dish or groove is less than 200mm.
Though sodium polyacrylate homopolymerization type super absorbent resin water absorbent rate height exists that rate of water absorption is slow, the shortcoming of salt tolerance difference; Though and the polyacrylamide water absorbent rate is low, rate of water absorption is fast, good salt tolerance.Therefore synthesized sodium acrylate-acrylamide binary copolymerization type water-holding agent (utilizing the disc type polymerization in air, to synthesize).Sodium acrylate-acrylamide binary copolymerization type absorbent resin has simultaneously that water absorbent rate is higher, salt tolerance advantage preferably, becomes the basis of preparation humate compound water retaining agent.
Humate is an important kind of humic acid fertilizer, is widely used in plant growth substance., adopt to connect and carry out extracting or add a certain amount of Na whether by calcium, magnesium combination according to the humic acids in the low rank coal with alkali solution technique
2CO
3Carry out extracting.
The preparation acetone soln wherein dissolves quantitative glycerol, makes surface treatment liquid.Acetone can make humic acids form active surface, and aqueous solvent can make acrylic acid-acrylamide copolymer form active surface, and glycerol is that surface-crosslinked reacted surface linking agent takes place for both.
The disc type polymerization can overcome owing to constantly stir the dissolved oxygen that the produces disadvantageous effect to polyreaction in polymerization process, and a polymerization and a dry step are finished, and makes the copolyreaction process simple.
Both had in the humate compound water retaining agent surface tissue ionic hydrophilic group group-COOH ,-COOK (or-COONa), have the hydrophilic radical-NH of multiple non-ionic type again
2(amino) ,-NH-CO (amido linkage)-,-COO-(ester bond) ,-OH (alcoholic extract hydroxyl group) ,-OH (phenolic hydroxyl group), also have the constitutional features of humic acids.Multiple hydrophilic radical can be brought into play synergy, has improved water absorbent rate, rate of water absorption and the electrolyte-resistant ability of humate compound water retaining agent.
Have three kinds of factors that help improving its water absorbing properties in the humate compound water retaining agent structure: 1. surperficial diversified hydrophilic radical can be brought into play the raising that synergy helps the comprehensive water absorbing properties of humate compound water retaining agent; 2. humic acids helps the raising of electrolyte-resistant performance to the complexing action of metal ion; 3. the mechanical iris action of humic acids can prevent surface gelling and help improving water absorbent rate and rate of water absorption.
Therefore, humate compound water retaining agent can be scattered in the water fast, equably, and water absorbent rate height, speed are fast, the electrolyte-resistant ability is strong; Humate can keep its stimulating plant that has to grow, improve the effect of soil nutrient situation, and can effectively reduce the water-holding agent product cost.Humate compound water retaining agent is specially adapted to prevent the improvement project of desertification and Desertification soil.
Embodiment
Embodiment 1:
The first step, the extraction of low rank coal humate:
Get 65g weathered coal (total humic acid content 67.8%, free humic acid content 65.7%) and put into container, add 400ml water, 5.5gNaOH (or KOH), 0.5gNa
2CO
3Stir, at room temperature extracting 2h filters by B, and filtrate obtains Sodium salts humic acids (or potassium humate) solid product 80 ℃ of oven dry down, the taking out the body rate and can reach 60%～65% of Sodium salts humic acids (or potassium humate).
Second step, acrylic acid synthesizing-acrylamide copolymer:
In container, add quantitative vinylformic acid in proportion, acrylamide, with concentration be 30% sodium hydroxide solution to be neutralized to degree of neutralization be 80%, add again after quantitative N,N methylene bis acrylamide stirs, add Potassium Persulphate K at ice-water bath
2S
2O
8Solution is modulated into and treats polymer fluid.To treat that polymer fluid pours in dish or other containers such as groove, and make sample path length in the container, make it in 80 ℃ of thermostat containers polymerization reaction take place 3-5 hour less than 200mm, and in vacuum drying oven (70 ℃～80 ℃) after dry 4-5 hour, to plate-like multipolymer.After its fragmentation, obtain Powdered acrylic acid-acrylamide copolymer.With the acrylic acid-acrylamide copolymer powder sieving after the fragmentation, it is standby to obtain 40～60 order fractions.
In said process, monomer ratio (mol ratio): [AM]/[AA]=0.1; Dosage of crosslinking agent (mol ratio): [MBA]/([AA]+[AM])=0.7 * 10
-4Initiator amount (mol ratio): [I]/([AA]+[AM])=0.1 * 10
-3
The 3rd step, compound preparation:
Configuration 30mL concentration is 80% aqueous acetone solution, wherein dissolves glycerol 0.06g, makes surface treatment liquid.The acrylic acid-acrylamide copolymer 20g and the 4g humic-acid-type substances of getting above-mentioned 40-60 order fraction mix, and be added dropwise to above-mentioned surface treatment liquid, stir, make surface treatment liquid wetting material table face, put into 80 ℃ of loft drier and carry out surface-crosslinked reaction 30min, obtain humate compound water retaining agent, its humic acids content is 16.7%, is 600～700g/g to the water absorbent rate of deionized water; Water absorbent rate to tap water is 220～240g/g; To concentration is that 0.5% urea soln liquid absorbency rate is 450～500g/g; Liquid absorbency rate to 0.9%NaCl solution is 90～100g/g.
Embodiment 2:
The first step is with the first step of embodiment 1.
Second step is with second step of embodiment 1.
The 3rd step, compound preparation:
Configuration 60mL concentration is 80% acetone soln, wherein dissolves glycerol 0.06g, makes surface treatment liquid.The acrylic acid-acrylamide copolymer 20g and the 10g humic-acid-type substances of getting above-mentioned 40-60 order fraction mix, and be added dropwise to above-mentioned surface treatment liquid, stir, make surface treatment liquid wetting material table face, put into 80 ℃ of loft drier and carry out surface-crosslinked reaction 40min, acquisition humic acids content is 33.3% humate compound water retaining agent, and it is to the water absorbent rate of deionized water: 400～470g/g; Water absorbent rate to tap water: 100～120g/g; To concentration is 0.5% urea soln liquid absorbency rate: 300～350g/g; Liquid absorbency rate to 0.9%NaCl solution: 70～80g/g.
Claims (7)
1, a kind of humate compound water retaining agent, it is characterized in that coal humic acid salt and acrylic acid-acrylamide copolymer are composite by 1: 1.5～5.5 weight ratio in this water-holding agent, and the adding surface treatment liquid is prepared from, described acrylic acid-acrylamide copolymer is to be the neutralization of 30% sodium hydroxide NaOH solution by monomer vinylformic acid AA and concentration, add acrylamide AM, linking agent MBA, initiator KPS polymerization obtains, monomer ratio mol ratio wherein: [AM]: [AA]=0.1: 1～0.2: 1; Dosage of crosslinking agent mol ratio: [MBA]: ([AA]+[AM])=0.6 * 10
-4: 1～0.8 * 10
-4: 1; Initiator amount mol ratio: [KSP]: ([AA]+[AM])=0.1 * 10
-3: 1～0.15 * 10
-3: 1,
Described surface treatment liquid is made by aqueous acetone solution dissolving glycerol, wherein the glycerol consumption calculates with 0.002～0.004g by handling every gram acrylic acid-acrylamide copolymer, and the aqueous acetone solution consumption calculates with 1.5～3.5mL by every gram acrylic acid-acrylamide copolymer.
2, humate compound water retaining agent according to claim 1 is characterized in that described coal humic acid salt is by low rank coal 60～70g, water 200～450ml, highly basic NaOH or KOH5g～6.5g, Na
2CO
30.4～0.6g, extracting is filtered, and 70～80 ℃ of oven dry obtain.
3, a kind of humate compound water retaining agent preparation method, it is characterized in that with the low rank coal being raw material, prepare humate with alkali solution technique, with disc type polymerization acrylic acid synthesizing-acrylamide copolymer, pass through humate then, acrylic acid-acrylamide copolymer, amino in the glycerol, carboxyl, condensation between the hydroxyl, the amidation surface chemical reaction, humate and acrylic acid-acrylamide copolymer are combined, be prepared into surface-crosslinked water preservation, it is humate compound water retaining agent, its synthetic method is: (1) puts into container with low rank coal, adds entry, highly basic NaOH or KOH, Na
2CO
3Stir, extracting at room temperature 1.5～2.5 hours is filtered or suction filtration by B, and the filtrate oven dry obtains Sodium salts humic acids or potassium humate solid product; (2) in container, add quantitative vinylformic acid, with concentration 30% sodium hydroxide solution neutralization, add quantitative acrylamide, add linking agent N again, after N '-methylene-bisacrylamide stirs, place ice-water bath to cool off in this container, again with initiator potassium persulfate K
2S
2O
8Solution joins in the above-mentioned reactant, is modulated into to treat polymer fluid, will treat that polymer fluid pours in tray of containers or the groove, make it polymerization reaction take place after, and convection drying obtains plate-like multipolymer, after its fragmentation, obtains Powdered acrylic acid-acrylamide copolymer; (3) configuration aqueous acetone solution, and dissolve glycerol therein, make the aqueous acetone solution surface treatment liquid that is dissolved with glycerol, humate and acrylic acid-acrylamide copolymer by 1: 1.5～5.5 mixed evenly after, be added dropwise to surface treatment liquid, stir, make surface treatment liquid wetting material table face, put into vacuum drying oven and carry out surface-crosslinked reaction, obtain humate compound water retaining agent, the monomer ratio mol ratio of described acrylic acid-acrylamide copolymer: [AM]: [AA]=0.1: 1～0.2: 1; Dosage of crosslinking agent mol ratio: [MBA]: ([AA]+[AM])=0.6 * 10
-4: 1～0.8 * 10
-4: 1; Initiator amount mol ratio: [KSP]: ([AA]+[AM])=0.1 * 10
-3: 1～0.15 * 10
-3: 1, described aqueous acetone solution concentration is 70%～80%, the glycerol consumption calculates by handling every gram acrylic acid-acrylamide copolymer 0.002～0.004g, the aqueous acetone solution consumption calculates with 1.5～3.5mL by every gram acrylic acid-acrylamide copolymer, and the thickness for the treatment of polymer fluid in described tray of containers or the groove is less than 200mm.
4, humate compound water retaining agent preparation method according to claim 3 is characterized in that described humate is by low rank coal 60～70g, water 200～450ml, 5g～6.5g highly basic NaOH or KOH, 0.4～0.6gNa
2CO
3, extracting is filtered, and oven dry obtains.
5, according to claim 3 or 4 described humate compound water retaining agent preparation methods, it is characterized in that described humate obtains like this: get 65g total humic acid content greater than 60%, free humic acid content is put into container greater than 55% leonardite, adds 400ml deionized water, 5.5gNaOH or KOH, 0.5g Na
2CO
3, to stir, extracting at room temperature 2 hours is filtered by B, and filtrate dries down at 70 ℃～80 ℃ and obtains, and the body rate of taking out of Sodium salts humic acids or potassium humate reaches 60～65%.
6, humate compound water retaining agent preparation method according to claim 3, it is characterized in that described acrylic acid-acrylamide copolymer obtains like this: in container, add quantitative vinylformic acid in proportion, acrylamide, with concentration be 30% sodium hydroxide solution to be neutralized to degree of neutralization be 80%, add quantitative N again, after N '-methylene-bisacrylamide stirs, this container is placed ice-water bath, again with initiator potassium persulfate K
2S
2O
8Solution joins in the above-mentioned reactant, be modulated into and treat polymer fluid, to treat that polymer fluid pours in tray of containers or the groove, make the dish or groove in sample path length less than 200mm, make it in 70 ℃～80 ℃ thermostat containers polymerization reaction take place 3-5 hour, and behind 70 ℃～80 ℃ convection dryings, get plate-like multipolymer, obtain Powdered acrylic acid-acrylamide copolymer after the fragmentation.
7, humate compound water retaining agent preparation method according to claim 3, it is characterized in that described humate compound water retaining agent obtains like this: configuration concentration is 80% aqueous acetone solution 60mL, wherein dissolve glycerol 0.06g, make surface treatment liquid, acrylic acid-acrylamide copolymer 20g and the 10g humate of getting 40-60 order fraction mix, and be added dropwise to surface treatment liquid 60mL, stir, make surface treatment liquid wetting material table face, put into 80 ℃ of vacuum drying ovens and carry out surface-crosslinked reaction 40min, obtain humate compound water retaining agent, its water absorbent rate to deionized water can reach 400～470g/g; Water absorbent rate to tap water can reach 100～120g/g; To concentration is that 0.5% urea soln liquid absorbency rate can reach: 300～350g/g; Liquid absorbency rate to 0.9%NaCl solution can reach: 70～80g/g.
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| CN101914209B (en) * | 2010-08-13 | 2011-12-28 | 中国矿业大学(北京) | Method for grafting humic acid into high water absorption resin and high water absorption resin obtained by same |
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| CN107602780A (en) * | 2017-09-27 | 2018-01-19 | 安徽金叶碳素科技有限公司 | A kind of lignite humic acid base super absorbent resin epoxy-type agricultural water-loss reducer and preparation method thereof |
| CN112940734A (en) * | 2021-04-26 | 2021-06-11 | 辽宁省农业科学院 | Water-retaining agent, preparation method thereof and method for constructing water-retaining plough layer by using water-retaining agent |
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