CN114292649B - Water-retaining agent for landscaping soil and preparation method thereof - Google Patents
Water-retaining agent for landscaping soil and preparation method thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002689 soil Substances 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 56
- 235000003301 Ceiba pentandra Nutrition 0.000 claims abstract description 51
- 244000146553 Ceiba pentandra Species 0.000 claims abstract description 51
- 239000000835 fiber Substances 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 46
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 45
- 229920002472 Starch Polymers 0.000 claims abstract description 20
- 235000019698 starch Nutrition 0.000 claims abstract description 20
- 239000008107 starch Substances 0.000 claims abstract description 20
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 claims abstract description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 12
- QOPDWTSNPRDISG-UHFFFAOYSA-N 2-benzofuran-1,3-dione;hydrochloride Chemical compound Cl.C1=CC=C2C(=O)OC(=O)C2=C1 QOPDWTSNPRDISG-UHFFFAOYSA-N 0.000 claims abstract description 12
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 11
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims abstract description 11
- -1 phthalic anhydride modified ammonium Chemical class 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 35
- 238000001035 drying Methods 0.000 claims description 20
- 239000003999 initiator Substances 0.000 claims description 15
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000460 chlorine Substances 0.000 claims description 10
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 claims description 10
- 235000002906 tartaric acid Nutrition 0.000 claims description 10
- 239000011975 tartaric acid Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000004090 dissolution Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 59
- 239000012267 brine Substances 0.000 abstract description 9
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 abstract description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- 238000007792 addition Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 4
- 239000008239 natural water Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010413 gardening Methods 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000000361 pesticidal effect Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
Landscapes
- Agricultural Chemicals And Associated Chemicals (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a water-retaining agent for landscaping soil, which comprises the following raw materials in parts by mass: 20-30 parts of acrylic acid, 90-130 parts of ammonium polyacrylate modified by phthalic anhydride chloride, 600 parts of water, 1.8-2.2 parts of diethylenetriamine, 12-17 parts of starch and 50-70 parts of modified kapok fiber powder. The invention also provides a preparation method of the water-retaining agent for landscaping soil, which comprises the steps of preparing modified kapok fiber powder, preparing phthalic anhydride modified ammonium polyacrylate chloride and preparing the water-retaining agent. The water-retaining agent disclosed by the invention has the advantages of high water absorption rate, high brine absorption rate, 857-870g/g and 43-45g/g.
Description
Technical Field
The invention relates to a water-retaining agent for landscaping soil and a preparation method thereof, belonging to the field of water-retaining agents.
Background
The water-retaining agent for soil is a functional high polymer material with strong water-absorbing capacity, is nontoxic and harmless, and can repeatedly release water and absorb water, so that it can be liked as "miniature reservoir" by people in agriculture, at the same time, it can absorb fertilizer and pesticide, and can slowly release, and can raise fertilizer efficiency and pesticide effect, and can be extensively used in the fields of agriculture, forestry and gardening, etc..
The main products at present are water-retaining agents made of polyacrylamide and polyacrylate water-absorbing resins, the water-retaining life can reach 2-4 years, but the water-retaining efficiency is in a year-by-year decreasing trend, the water-absorbing resins have a certain water absorption rate, but the water absorption rate is lower, the time required for full absorption is long, and the sodium polyacrylate water-retaining agent in the polyacrylate water-absorbing resins can cause the rising of the sodium ion content in soil and can cause the gradual deterioration of the soil environment.
In addition, the starch grafted acrylate water-retaining agent has excellent properties such as water absorption rate and water absorption rate, but has short service life, and the water-retaining life can be maintained for about one year.
CN105112071a discloses a granular humic acid type soil water-retaining agent, which is a starch grafted acrylic acid salt type water-retaining agent, and also has short water-retaining life, can not retain water for a long time, and has fast water absorption rate and fast water release rate.
In summary, the prior art has the following problems:
(1) The existing water-retaining agent with long water retention life has low water absorption rate, the water retention efficiency can not be maintained, and the water retention efficiency is reduced year by year;
(2) The existing water-retaining agent with high water absorption rate and high water absorption rate has the defects of high water release rate and short water retention life.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and the following aims are fulfilled by modifying raw materials to prepare the water-retaining agent:
(1) The water retention agent has long water retention life, high water absorption rate and maintained water retention efficiency;
(2) The water-retaining agent with high water absorption rate has the advantages of high water absorption rate, low water release rate and long water retention life.
In order to solve the technical problems, the invention adopts the following technical scheme:
The water-retaining agent for landscaping soil comprises the following raw materials in parts by mass: 20-30 parts of acrylic acid, 90-130 parts of ammonium polyacrylate modified by phthalic anhydride chloride, 600 parts of water, 1.8-2.2 parts of diethylenetriamine, 12-17 parts of starch and 50-70 parts of modified kapok fiber powder.
The following is a further improvement of the above technical scheme:
The preparation method comprises the steps of preparing modified kapok fiber powder, preparing ammonium polyacrylate modified by phthalic anhydride chloride and preparing a water-retaining agent.
The preparation of modified kapok fiber powder, drying kapok fibers to a water content of 1-3%, crushing to 180-250 meshes to obtain kapok fiber powder, dispersing the kapok fiber powder in absolute ethyl alcohol, adding tartaric acid for dissolution, stirring for 50-70min at 110-120 ℃, carrying out suction filtration after stirring, drying filter residues to a water content of 1-3%, and crushing to 180-250 meshes to obtain modified kapok fiber powder;
the mass ratio of the kapok fiber powder to the absolute ethyl alcohol is 1:40-60;
The mass ratio of the tartaric acid to the kapok fiber powder is 2.5-3.5:1.
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, adding an initiator into a reaction kettle, heating to 80-90 ℃, adding phthalic anhydride, stirring for 80-120min, cooling to 50-60 ℃, introducing chlorine, continuing stirring for 320-400min, evaporating and drying, and washing with acetone to obtain ammonium polyacrylate modified by phthalic anhydride chloride;
The mass ratio of the ammonium polyacrylate to the water is 1:12-17;
The initiator consists of ammonium persulfate and potassium persulfate, and the mass ratio is 1:0.5-1.5;
the mass ratio of the initiator to the ammonium polyacrylate is 1:75-85;
the mass ratio of the phthalic anhydride to the ammonium polyacrylate is 1:20-30;
The mass ratio of the chlorine to the ammonium polyacrylate is 1:1.8-2.2.
Uniformly mixing acrylic acid, ammonium polyacrylate modified by phthalic anhydride and water to obtain a mixed solution, adding diethylenetriamine, stirring at 60-70 ℃ for 50-80min, adding half of the total starch, finishing the addition within 15-25min, continuing stirring for 25-35min after the addition is finished, adding the rest starch and modified kapok fiber powder, finishing the addition within 15-25min, continuing stirring for 50-70min after the addition is finished, evaporating, drying, and granulating to obtain the water-retaining agent;
The particle size of the water-retaining agent is 1.2-1.7mm.
Compared with the prior art, the invention has the following beneficial effects:
the water-retaining agent disclosed by the invention has high water absorption rate, high brine absorption rate, 857-870g/g and 43-45g/g (NY/T886-2016);
the water-retaining agent has the advantages of high water absorption rate, natural water absorption of 13-15min reaching 857-870g/g, low water release rate, strong water retention capacity, water retention rate of 96.9-97.5% for 12h, water retention rate of 81.2-81.4% for 24h, water retention rate of 63.5-64.2% for 36h, water retention rate of 47.6-48.7% for 48h, water retention rate of 29.8-30.9% for 60h, water retention rate of 15.2-15.3% for 72h, water retention rate of 6.5-6.7% for 84h and water retention rate of 1.9-2.1% for 96 h;
the water-retaining agent disclosed by the invention has a long service life, can still keep a certain water absorption rate after 24 months, has a water absorption rate of 840-850g/g after 6 months, has a water absorption rate of 610-630g/g after 12 months, has a water absorption rate of 510-520g/g after 18 months, and has a water absorption rate of 220-240g/g after 24 months.
Detailed Description
Example 1
(1) Preparing modified kapok fiber powder
Drying kapok fibers to a water content of 2%, crushing to 200 meshes to obtain kapok fiber powder, dispersing the kapok fiber powder in absolute ethyl alcohol, adding tartaric acid for dissolution, stirring at 115 ℃ for 60min, carrying out suction filtration after stirring, drying filter residues to a water content of 2%, and crushing to 200 meshes to obtain modified kapok fiber powder;
the mass ratio of the kapok fiber powder to the absolute ethyl alcohol is 1:50;
the mass ratio of the tartaric acid to the kapok fiber powder is 3:1.
(2) Preparation of phthalic anhydride chloride modified ammonium polyacrylate
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate water solution, adding an initiator into a reaction kettle, heating to 85 ℃, adding phthalic anhydride, stirring for 90min, cooling to 55 ℃, introducing chlorine, continuing stirring for 360min, evaporating, drying, and washing with acetone to obtain phthalic anhydride chloride modified ammonium polyacrylate;
the mass ratio of the ammonium polyacrylate to the water is 1:15;
the initiator consists of ammonium persulfate and potassium persulfate, and the mass ratio is 1:1;
the mass ratio of the initiator to the ammonium polyacrylate is 1:80;
The mass ratio of the phthalic anhydride to the ammonium polyacrylate is 1:25;
The mass ratio of the chlorine to the ammonium polyacrylate is 1:2.
(3) Preparation of Water-retaining agent
The water-retaining agent comprises the following raw materials in parts by mass: 24 parts of acrylic acid, 110 parts of ammonium polyacrylate modified by phthalic anhydride chloride, 700 parts of water, 2 parts of diethylenetriamine, 15 parts of starch and 60 parts of modified kapok fiber powder;
Uniformly mixing acrylic acid, ammonium polyacrylate modified by phthalic anhydride chloride and water to obtain a mixed solution, adding diethylenetriamine, stirring at 65 ℃ for 60min, adding half of the total starch, finishing the addition within 20min, continuing stirring for 30min after finishing the addition, adding the rest starch and modified kapok fiber powder, finishing the addition within 20min, continuing stirring for 60min after finishing the addition, evaporating, drying and granulating to obtain the water-retaining agent;
The particle size of the water-retaining agent is 1.5mm.
The water-retaining agent of the example 1 has high water absorption rate and high brine absorption rate, the water absorption rate is 870g/g, and the brine absorption rate is 45g/g (NY/T886-2016);
the water-retaining agent of the embodiment 1 has high water absorption rate, natural water absorption rate of 870g/g for 13min, low water release rate, strong water retention capacity, 97.5% for 12h, 81.3% for 24h, 64.2% for 36h, 48.7% for 48h, 30.9% for 60h, 15.3% for 72h, 6.7% for 84h and 2.1% for 96 h;
The water-retaining agent of example 1 has a long service life, and can still maintain a certain water absorption rate after 24 months, the water absorption rate after 6 months is 850g/g, the water absorption rate after 12 months is 630g/g, the water absorption rate after 18 months is 520g/g, and the water absorption rate after 24 months is 240g/g.
Example 2
(1) Preparing modified kapok fiber powder
Drying kapok fibers to a water content of 1%, crushing to 180 meshes to obtain kapok fiber powder, dispersing the kapok fiber powder in absolute ethyl alcohol, adding tartaric acid for dissolution, stirring at 110 ℃ for 70min, carrying out suction filtration after stirring, drying filter residues to a water content of 1%, and crushing to 180 meshes to obtain modified kapok fiber powder;
the mass ratio of the kapok fiber powder to the absolute ethyl alcohol is 1:40;
the mass ratio of the tartaric acid to the kapok fiber powder is 2.5:1.
(2) Preparation of phthalic anhydride chloride modified ammonium polyacrylate
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate water solution, adding an initiator into a reaction kettle, heating to 80 ℃, adding phthalic anhydride, stirring for 120min, cooling to 50 ℃, introducing chlorine, continuing stirring for 400min, evaporating, drying, and washing with acetone to obtain phthalic anhydride chloride modified ammonium polyacrylate;
The mass ratio of the ammonium polyacrylate to the water is 1:12;
The initiator consists of ammonium persulfate and potassium persulfate, and the mass ratio is 1:0.5;
The mass ratio of the initiator to the ammonium polyacrylate is 1:75;
The mass ratio of the phthalic anhydride to the ammonium polyacrylate is 1:20;
the mass ratio of the chlorine to the ammonium polyacrylate is 1:1.8.
(3) Preparation of Water-retaining agent
The water-retaining agent comprises the following raw materials in parts by mass: 20 parts of acrylic acid, 90 parts of ammonium polyacrylate modified by phthalic anhydride chloride, 600 parts of water, 1.8 parts of diethylenetriamine, 12 parts of starch and 50 parts of modified kapok fiber powder;
Uniformly mixing acrylic acid, ammonium polyacrylate modified by phthalic anhydride chloride and water to obtain a mixed solution, adding diethylenetriamine, stirring at 60 ℃ for 80min, adding half of the total starch, finishing the addition within 15min, continuing stirring for 25min after finishing the addition, adding the rest starch and modified kapok fiber powder, finishing the addition within 15min, continuing stirring for 50min after finishing the addition, evaporating, drying and granulating to obtain the water-retaining agent;
the particle size of the water-retaining agent is 1.2mm.
The water-retaining agent of the example 2 has high water absorption rate and high brine absorption rate, the water absorption rate is 862g/g, and the brine absorption rate is 43g/g (NY/T886-2016);
The water-retaining agent of the embodiment 2 has the advantages of high water absorption rate, natural water absorption for 14min reaching 862g/g, low water release rate, strong water retention capacity, 96.9% of 12-hour water retention rate, 81.2% of 24-hour water retention rate, 63.8% of 36-hour water retention rate, 48.5% of 48-hour water retention rate, 30.2% of 60-hour water retention rate, 15.2% of 72-hour water retention rate, 6.5% of 84-hour water retention rate and 2.0% of 96-hour water retention rate;
The water-retaining agent of example 2 has a long service life, and can still maintain a certain water absorption rate after 24 months, wherein the water absorption rate after 6 months is 840g/g, the water absorption rate after 12 months is 610g/g, the water absorption rate after 18 months is 510g/g, and the water absorption rate after 24 months is 220g/g.
Example 3
(1) Preparing modified kapok fiber powder
Drying kapok fibers to a water content of 3%, crushing to obtain kapok fiber powder with a particle size of 250 meshes, dispersing the kapok fiber powder in absolute ethyl alcohol, adding tartaric acid for dissolution, stirring at 120 ℃ for 50min, carrying out suction filtration after stirring, drying filter residues to a water content of 3%, and crushing to obtain modified kapok fiber powder with a particle size of 250 meshes;
the mass ratio of the kapok fiber powder to the absolute ethyl alcohol is 1:60;
the mass ratio of the tartaric acid to the kapok fiber powder is 3.5:1.
(2) Preparation of phthalic anhydride chloride modified ammonium polyacrylate
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate water solution, adding an initiator into a reaction kettle, heating to 90 ℃, adding phthalic anhydride, stirring for 80min, cooling to 60 ℃, introducing chlorine, continuing stirring for 320min, evaporating, drying, and washing with acetone to obtain phthalic anhydride chloride modified ammonium polyacrylate;
The mass ratio of the ammonium polyacrylate to the water is 1:17;
the initiator consists of ammonium persulfate and potassium persulfate, and the mass ratio is 1:1.5;
the mass ratio of the initiator to the ammonium polyacrylate is 1:85;
The mass ratio of the phthalic anhydride to the ammonium polyacrylate is 1:30;
the mass ratio of the chlorine to the ammonium polyacrylate is 1:2.2.
(3) Preparation of Water-retaining agent
The water-retaining agent comprises the following raw materials in parts by mass: 30 parts of acrylic acid, 130 parts of ammonium polyacrylate modified by phthalic anhydride chloride, 800 parts of water, 2.2 parts of diethylenetriamine, 17 parts of starch and 70 parts of modified kapok fiber powder;
Uniformly mixing acrylic acid, ammonium polyacrylate modified by phthalic anhydride chloride and water to obtain a mixed solution, adding diethylenetriamine, stirring at 70 ℃ for 50min, adding half of the total starch, finishing the addition within 25min, continuing stirring for 35min after finishing the addition, adding the rest starch and modified kapok fiber powder, finishing the addition within 25min, continuing stirring for 70min after finishing the addition, evaporating, drying and granulating to obtain the water-retaining agent;
The particle size of the water-retaining agent is 1.7mm.
The water-retaining agent of example 3 has high water absorption rate, high brine absorption rate, 857g/g water absorption rate and 44g/g brine absorption rate (NY/T886-2016);
The water-retaining agent of the embodiment 3 has high water absorption rate, natural water absorption for 15min reaches 857g/g, low water release rate and strong water retention capacity, the water retention rate for 12h is 97.2%, the water retention rate for 24h is 81.4%, the water retention rate for 36h is 63.5%, the water retention rate for 48h is 47.6%, the water retention rate for 60h is 29.8%, the water retention rate for 72h is 15.3%, the water retention rate for 84h is 6.5%, and the water retention rate for 96h is 1.9%;
The water-retaining agent of example 3 has a long service life, and can still maintain a certain water absorption rate after 24 months, wherein the water absorption rate after 6 months is 840g/g, the water absorption rate after 12 months is 620g/g, the water absorption rate after 18 months is 510g/g, and the water absorption rate after 24 months is 230g/g.
Comparative example 1
Based on the example 1, the steps of preparing modified kapok fiber powder and preparing phthalic anhydride modified ammonium polyacrylate are omitted, unmodified kapok fiber powder and common ammonium polyacrylate are used, and the rest steps are the same, so that the water-retaining agent is prepared.
The water-retaining agent of comparative example 1 has a water absorption rate of 480g/g and a brine absorption rate of 21g/g (NY/T886-2016);
the water retention agent of comparative example 1 naturally absorbs water for 32min to achieve 480g/g, the water retention rate for 12h is 92.1%, the water retention rate for 24h is 63.5%, the water retention rate for 36h is 32.8%, the water retention rate for 48h is 27.7%, the water retention rate for 60h is 12.5%, and the water retention rate for 72h is 0%;
The water-retaining agent of comparative example 1 had a water absorption capacity of 420g/g after 6 months, 270g/g after 12 months and 130g/g after 18 months.
Claims (2)
1. The water-retaining agent for landscaping soil is characterized by comprising the following raw materials in parts by mass: 20-30 parts of acrylic acid, 90-130 parts of phthalic anhydride chloride modified ammonium polyacrylate, 600 parts of water, 1.8-2.2 parts of diethylenetriamine, 12-17 parts of starch and 50-70 parts of modified kapok fiber powder;
the preparation method of the water-retaining agent for landscaping soil comprises the steps of preparing modified kapok fiber powder, preparing ammonium polyacrylate modified by phthalic anhydride chloride and preparing the water-retaining agent;
The preparation of modified kapok fiber powder, drying kapok fibers to a water content of 1-3%, crushing to 180-250 meshes to obtain kapok fiber powder, dispersing the kapok fiber powder in absolute ethyl alcohol, adding tartaric acid for dissolution, stirring for 50-70min at 110-120 ℃, carrying out suction filtration after stirring, drying filter residues to a water content of 1-3%, and crushing to 180-250 meshes to obtain modified kapok fiber powder;
the mass ratio of the kapok fiber powder to the absolute ethyl alcohol is 1:40-60;
the mass ratio of the tartaric acid to the kapok fiber powder is 2.5-3.5:1;
dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, adding an initiator into a reaction kettle, heating to 80-90 ℃, adding phthalic anhydride, stirring for 80-120min, cooling to 50-60 ℃, introducing chlorine, continuing stirring for 320-400min, evaporating and drying, and washing with acetone to obtain ammonium polyacrylate modified by phthalic anhydride chloride;
The mass ratio of the ammonium polyacrylate to the water is 1:12-17;
The initiator consists of ammonium persulfate and potassium persulfate, and the mass ratio is 1:0.5-1.5;
the mass ratio of the initiator to the ammonium polyacrylate is 1:75-85;
the mass ratio of the phthalic anhydride to the ammonium polyacrylate is 1:20-30;
the mass ratio of the chlorine to the ammonium polyacrylate is 1:1.8-2.2;
The water-retaining agent is prepared by uniformly mixing acrylic acid, ammonium polyacrylate modified by phthalic anhydride and water to obtain a mixed solution, adding diethylenetriamine, stirring at 60-70 ℃ for 50-80min, adding half of the total amount of starch, adding the starch within 15-25min, continuing stirring for 25-35min after adding, adding the rest starch and modified kapok fiber powder, adding the starch within 15-25min, continuing stirring for 50-70min after adding, evaporating and drying, and granulating to obtain the water-retaining agent.
2. The water-retaining agent for landscaping soil according to claim 1, wherein:
The particle size of the water-retaining agent is 1.2-1.7mm.
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| CN202111605126.8A CN114292649B (en) | 2021-12-25 | 2021-12-25 | Water-retaining agent for landscaping soil and preparation method thereof |
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| CN202111605126.8A CN114292649B (en) | 2021-12-25 | 2021-12-25 | Water-retaining agent for landscaping soil and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103524681A (en) * | 2012-07-03 | 2014-01-22 | 中国科学院兰州化学物理研究所 | Kapok fiber composite super absorbent resin as well as preparation method thereof |
| CN109439340A (en) * | 2018-10-18 | 2019-03-08 | 北京市园林绿化集团有限公司 | A kind of afforestation soil water-retaining agent and its preparation method and application |
| CN111172756A (en) * | 2020-02-25 | 2020-05-19 | 南通大学 | Cotton fiber grafted acrylic acid type super water-absorbent resin and preparation method and application thereof |
-
2021
- 2021-12-25 CN CN202111605126.8A patent/CN114292649B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103524681A (en) * | 2012-07-03 | 2014-01-22 | 中国科学院兰州化学物理研究所 | Kapok fiber composite super absorbent resin as well as preparation method thereof |
| CN109439340A (en) * | 2018-10-18 | 2019-03-08 | 北京市园林绿化集团有限公司 | A kind of afforestation soil water-retaining agent and its preparation method and application |
| CN111172756A (en) * | 2020-02-25 | 2020-05-19 | 南通大学 | Cotton fiber grafted acrylic acid type super water-absorbent resin and preparation method and application thereof |
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| CN114292649A (en) | 2022-04-08 |
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