CN114292649A - 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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- CN114292649A CN114292649A CN202111605126.8A CN202111605126A CN114292649A CN 114292649 A CN114292649 A CN 114292649A CN 202111605126 A CN202111605126 A CN 202111605126A CN 114292649 A CN114292649 A CN 114292649A
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- retaining agent
- ammonium polyacrylate
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000002689 soil Substances 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 57
- 239000000835 fiber Substances 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 45
- 244000146553 Ceiba pentandra Species 0.000 claims abstract description 29
- 235000003301 Ceiba pentandra Nutrition 0.000 claims abstract description 29
- -1 chlorinated phthalic anhydride modified ammonium Chemical class 0.000 claims abstract description 25
- 229920002472 Starch Polymers 0.000 claims abstract description 18
- 235000019698 starch Nutrition 0.000 claims abstract description 18
- 239000008107 starch Substances 0.000 claims abstract description 18
- 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
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 35
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 31
- 241000332382 Ceiba Species 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 20
- 239000003999 initiator Substances 0.000 claims description 15
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-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
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 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
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 9
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 7
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 230000008020 evaporation Effects 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
- 239000002245 particle Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 59
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 10
- 239000011780 sodium chloride Substances 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010298 pulverizing process Methods 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 239000008239 natural water Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 2
- 238000000967 suction filtration Methods 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
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 238000003898 horticulture 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
- 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 chlorinated phthalic anhydride 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 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 chlorinated phthalic anhydride modified ammonium polyacrylate and preparing the water-retaining agent. The water-retaining agent has high water absorption rate and high saline absorption rate, wherein the water absorption rate is 857-870g/g, and the saline absorption rate is 43-45 g/g.
Description
Technical Field
The invention relates to a water-retaining agent for landscaping soil and a preparation method thereof, and belongs to the field of water-retaining agents.
Background
The water-retaining agent for soil is a functional polymer material with extremely strong water absorption capacity, is non-toxic and harmless, and can repeatedly release water and absorb water, so that it is compared with 'micro reservoir' by people in agriculture, and at the same time, it can absorb fertilizer and pesticide, slowly release water, and can increase fertilizer efficiency and pesticide effect, and can be extensively used in the fields of agriculture, forestry and horticulture, etc.
The main product at present is a water-retaining agent prepared from polyacrylamide and polyacrylate water-absorbent resin, the water-retaining life can reach 2-4 years, but the water-retaining efficiency is in the trend of declining year by year, the water-absorbent resin has a certain water-absorbing rate, but the water-absorbing rate is low, the full absorption time is long, and the sodium polyacrylate water-retaining agent in the acrylate water-absorbent resin can cause the content of sodium ions in soil to rise, and can cause the soil environment to deteriorate gradually.
In addition, the starch grafted acrylate water retention agent has excellent water absorption rate, water absorption rate and other properties, but has short service life, and the water retention life can only be maintained for about one year.
CN105112071A discloses a granular humic acid type soil water-retaining agent which is a starch grafted acrylate water-retaining agent, has short water-retaining life, can not retain water for a long time, and has high water-absorbing rate and high water-releasing rate.
In summary, the prior art has the following problems:
(1) the existing water-retaining agent with long water-retaining life has low water absorption rate, and the water-retaining efficiency can not be maintained and is reduced year by year;
(2) the existing water-retaining agent with high water absorption rate and high water absorption rate has high water release rate and short water-retaining service life.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and the water-retaining agent is prepared by modifying the raw materials, so that the following purposes are achieved:
(1) the water retention agent has long water retention life, high water absorption rate and water retention efficiency;
(2) the water-retaining agent with high water absorption rate has high water absorption rate, low water release rate and long water-retaining service 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 chlorinated phthalic anhydride 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 following is a further improvement of the above technical solution:
the preparation method comprises the steps of preparing modified kapok fiber powder, preparing chlorinated phthalic anhydride modified ammonium polyacrylate and preparing a water-retaining agent.
The preparation method comprises the steps of preparing modified ceiba fiber powder, drying ceiba fiber to the water content of 1-3%, crushing to 180-mesh and 250-mesh to obtain ceiba fiber powder, dispersing the ceiba fiber powder in absolute ethyl alcohol, adding tartaric acid to dissolve, stirring at the temperature of 110-mesh and 120 ℃ for 50-70min, performing suction filtration after stirring, drying filter residue to the water content of 1-3%, and crushing to 180-mesh and 250-mesh to obtain modified ceiba 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.
Preparing chlorinated phthalic anhydride modified ammonium polyacrylate, dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, putting the solution into a reaction kettle, adding an initiator, heating to 80-90 ℃, adding phthalic anhydride, stirring for 80-120min, cooling to 50-60 ℃, introducing chlorine, continuing stirring for 320-400min, evaporating, drying, and washing with acetone to obtain chlorinated phthalic anhydride modified ammonium polyacrylate;
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 of the ammonium persulfate to the potassium persulfate 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 gas to the ammonium polyacrylate is 1: 1.8-2.2.
The preparation method comprises the steps of uniformly mixing acrylic acid, chlorinated phthalic anhydride modified ammonium polyacrylate and water to obtain a mixed solution, adding diethylenetriamine, stirring at 60-70 ℃ for 50-80min, adding half of the total amount of starch, completing the addition within 15-25min, continuing to stir for 25-35min after the addition is completed, adding the rest starch and modified kapok fiber powder, completing the addition within 15-25min, continuing to stir for 50-70min after the addition is completed, and performing granulation after evaporation drying to obtain the water-retaining agent;
and (3) granulating, wherein the particle size of the water-retaining agent is 1.2-1.7 mm.
Compared with the prior art, the invention has the following beneficial effects:
the water-retaining agent has high water absorption rate, high saline absorption rate (857-;
the water retention agent has high water absorption rate, the water absorption capacity of natural water absorption reaches 870g/g of 857-type water-absorbing agent within 13-15min, the water release rate is low, the water retention capacity is strong, the water retention rate for 12h is 96.9-97.5%, the water retention rate for 24h is 81.2-81.4%, the water retention rate for 36h is 63.5-64.2%, the water retention rate for 48h is 47.6-48.7%, the water retention rate for 60h is 29.8-30.9%, the water retention rate for 72h is 15.2-15.3%, the water retention rate for 84h is 6.5-6.7%, and the water retention rate for 96h is 1.9-2.1%;
the water-retaining agent has long service life, can still maintain a certain water absorption rate after 24 months, the water absorption rate after 6 months is 840-850g/g, the water absorption rate after 12 months is 610-630g/g, the water absorption rate after 18 months is 510-520g/g, and the water absorption rate after 24 months is 220-240 g/g.
Detailed Description
Example 1
(1) Preparation of modified kapok fiber powder
Drying the ceiba fiber to the water content of 2%, pulverizing to 200 meshes to obtain ceiba fiber powder, dispersing the ceiba fiber powder in absolute ethanol, adding tartaric acid to dissolve, stirring at 115 deg.C for 60min, filtering after stirring, drying the filter residue to the water content of 2%, and pulverizing to 200 meshes to obtain modified ceiba 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 chlorinated phthalic anhydride modified ammonium polyacrylate
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, adding an initiator into a reaction kettle, heating to 85 ℃, adding phthalic anhydride, stirring for 90min, cooling to 55 ℃, introducing chlorine gas, continuing to stir for 360min, evaporating, drying, and washing with acetone to obtain chlorinated phthalic anhydride 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 gas to the ammonium polyacrylate is 1:2.
(3) Preparation of Water-retaining Agents
The water-retaining agent comprises the following raw materials in parts by mass: 24 parts of acrylic acid, 110 parts of chlorinated phthalic anhydride modified ammonium polyacrylate, 700 parts of water, 2 parts of diethylenetriamine, 15 parts of starch and 60 parts of modified kapok fiber powder;
uniformly mixing acrylic acid, chlorinated phthalic anhydride modified ammonium polyacrylate and water to obtain a mixed solution, adding diethylenetriamine, stirring at 65 ℃ for 60min, adding half of the total amount of starch, completing the addition within 20min, continuing to stir for 30min after the addition is completed, adding the rest starch and modified kapok fiber powder, completing the addition within 20min, continuing to stir for 60min after the addition is completed, and granulating after evaporation and drying to obtain a water-retaining agent;
and (3) granulating, wherein the particle size of the water-retaining agent is 1.5 mm.
The water-retaining agent of the embodiment 1 has high water absorption rate and high saline absorption rate, the water absorption rate is 870g/g, and the saline absorption rate is 45g/g (NY/T886-;
the water-retaining agent of the embodiment 1 has high water absorption rate, the water absorption capacity of naturally absorbing water for 13min reaches 870g/g, the water release rate is low, the water retention capacity is strong, the water retention rate in 12h is 97.5%, the water retention rate in 24h is 81.3%, the water retention rate in 36h is 64.2%, the water retention rate in 48h is 48.7%, the water retention rate in 60h is 30.9%, the water retention rate in 72h is 15.3%, the water retention rate in 84h is 6.7%, and the water retention rate in 96h is 2.1%;
the water-retaining agent of example 1 has a long life, can maintain a certain water absorption capacity after 24 months, and has a water absorption capacity of 850g/g after 6 months, 630g/g after 12 months, 520g/g after 18 months, and 240g/g after 24 months.
Example 2
(1) Preparation of modified kapok fiber powder
Drying the ceiba fiber to the water content of 1%, pulverizing to 180 meshes to obtain ceiba fiber powder, dispersing the ceiba fiber powder in absolute ethanol, adding tartaric acid to dissolve, stirring at 110 deg.C for 70min, filtering after stirring, drying the filter residue to the water content of 1%, and pulverizing to 180 meshes to obtain modified ceiba 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 chlorinated phthalic anhydride modified ammonium polyacrylate
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, adding an initiator into a reaction kettle, heating to 80 ℃, adding phthalic anhydride, stirring for 120min, cooling to 50 ℃, introducing chlorine gas, continuing to stir for 400min, evaporating, drying, and washing with acetone to obtain chlorinated phthalic anhydride 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 gas to the ammonium polyacrylate is 1: 1.8.
(3) Preparation of Water-retaining Agents
The water-retaining agent comprises the following raw materials in parts by mass: 20 parts of acrylic acid, 90 parts of chlorinated phthalic anhydride modified ammonium polyacrylate, 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, chlorinated phthalic anhydride modified ammonium polyacrylate and water to obtain a mixed solution, adding diethylenetriamine, stirring for 80min at 60 ℃, adding half of the total amount of starch, completing the addition within 15min, continuing to stir for 25min after the addition is completed, adding the rest starch and modified kapok fiber powder, completing the addition within 15min, continuing to stir for 50min after the addition is completed, and granulating after evaporation and drying to obtain a water-retaining agent;
and (3) granulating, wherein the particle size of the water-retaining agent is 1.2 mm.
The water-retaining agent of the embodiment 2 has high water absorption rate and high saline absorption rate, the water absorption rate is 862g/g, and the saline absorption rate is 43g/g (NY/T886-;
the water-retaining agent of the embodiment 2 has high water absorption rate, the water absorption capacity of natural water absorption for 14min reaches 862g/g, the water release rate is low, and the water retention capacity is strong, the water retention rate in 12h is 96.9%, the water retention rate in 24h is 81.2%, the water retention rate in 36h is 63.8%, the water retention rate in 48h is 48.5%, the water retention rate in 60h is 30.2%, the water retention rate in 72h is 15.2%, the water retention rate in 84h is 6.5%, and the water retention rate in 96h is 2.0%;
the water-retaining agent of example 2 has a long life, and can maintain a certain water absorption capacity after 24 months, the water absorption capacity after 6 months is 840g/g, the water absorption capacity after 12 months is 610g/g, the water absorption capacity after 18 months is 510g/g, and the water absorption capacity after 24 months is 220 g/g.
Example 3
(1) Preparation of modified kapok fiber powder
Drying the ceiba fiber to the water content of 3%, crushing to 250 meshes to obtain ceiba fiber powder, dispersing the ceiba fiber powder in absolute ethyl alcohol, adding tartaric acid to dissolve, stirring at 120 ℃ for 50min, performing suction filtration after stirring, drying the filter residue to the water content of 3%, and crushing to 250 meshes to obtain modified ceiba fiber powder;
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 chlorinated phthalic anhydride modified ammonium polyacrylate
Dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, adding an initiator into a reaction kettle, heating to 90 ℃, adding phthalic anhydride, stirring for 80min, cooling to 60 ℃, introducing chlorine gas, continuing stirring for 320min, evaporating, drying, and washing with acetone to obtain chlorinated phthalic anhydride 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 gas to the ammonium polyacrylate is 1: 2.2.
(3) Preparation of Water-retaining Agents
The water-retaining agent comprises the following raw materials in parts by mass: 30 parts of acrylic acid, 130 parts of chlorinated phthalic anhydride modified ammonium polyacrylate, 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, chlorinated phthalic anhydride modified ammonium polyacrylate and water to obtain a mixed solution, adding diethylenetriamine, stirring for 50min at 70 ℃, adding half of the total amount of starch, completing the addition within 25min, continuing to stir for 35min after the addition is completed, adding the rest starch and modified kapok fiber powder, completing the addition within 25min, continuing to stir for 70min after the addition is completed, and granulating after evaporation and drying to obtain a water-retaining agent;
and (3) granulating, wherein the particle size of the water-retaining agent is 1.7 mm.
The water-retaining agent of the embodiment 3 has high water absorption rate and high saline absorption rate, the water absorption rate is 857g/g, and the saline absorption rate is 44g/g (NY/T886-;
the water-retaining agent of the embodiment 3 has high water absorption rate, the water absorption capacity of the water-retaining agent reaches 857g/g after 15min of natural water absorption, the water release rate is low, the water retention capacity is high, the water retention rate in 12h is 97.2%, the water retention rate in 24h is 81.4%, the water retention rate in 36h is 63.5%, the water retention rate in 48h is 47.6%, the water retention rate in 60h is 29.8%, the water retention rate in 72h is 15.3%, the water retention rate in 84h is 6.5%, and the water retention rate in 96h is 1.9%;
the water-retaining agent of example 3 has a long life, can maintain a certain water absorption capacity after 24 months, and has a water absorption capacity of 840g/g after 6 months, 620g/g after 12 months, 510g/g after 18 months, and 230g/g after 24 months.
Comparative example 1
On the basis of example 1, the steps of preparing modified kapok fiber powder and preparing chlorinated phthalic anhydride modified ammonium polyacrylate are omitted, unmodified kapok fiber powder and common ammonium polyacrylate are used, and the other steps are the same, so that the water-retaining agent is prepared.
The water absorption multiplying power of the water retaining agent of the comparative example 1 is 480g/g, and the saline absorption multiplying power is 21g/g (NY/T886-2016);
the water retaining agent of the comparative example 1 naturally absorbs water for 32min, the water absorption reaches 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, a water absorption capacity of 270g/g after 12 months, and a water absorption capacity of 130g/g after 18 months.
Claims (8)
1. The water-retaining agent for landscaping soil is characterized by comprising the following components in parts by mass: 20-30 parts of acrylic acid, 90-130 parts of chlorinated phthalic anhydride 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.
2. A preparation method of a water-retaining agent for landscaping soil is characterized by comprising the steps of preparing modified kapok fiber powder, preparing chlorinated phthalic anhydride modified ammonium polyacrylate and preparing the water-retaining agent.
3. The preparation method of the water-retaining agent for landscaping soil as claimed in claim 2, wherein the water-retaining agent comprises the following steps:
the preparation method comprises the steps of drying the ceiba fiber to the water content of 1-3%, crushing to 180-mesh and 250-mesh to obtain ceiba fiber powder, dispersing the ceiba fiber powder in absolute ethyl alcohol, adding tartaric acid to dissolve, stirring at the temperature of 110-mesh and 120 ℃ for 50-70min, filtering after stirring, drying filter residues to the water content of 1-3%, and crushing to 180-mesh and 250-mesh to obtain the modified ceiba fiber powder.
4. The preparation method of the water-retaining agent for landscaping soil as claimed in claim 3, wherein the water-retaining agent comprises the following steps:
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.
5. The preparation method of the water-retaining agent for landscaping soil as claimed in claim 2, wherein the water-retaining agent comprises the following steps:
the method comprises the steps of preparing chlorinated phthalic anhydride modified ammonium polyacrylate, dissolving ammonium polyacrylate in water to obtain ammonium polyacrylate aqueous solution, putting the solution into a reaction kettle, adding an initiator, heating to 80-90 ℃, adding phthalic anhydride, stirring for 80-120min, cooling to 50-60 ℃, introducing chlorine gas, continuing stirring for 320-400min, evaporating, drying, and washing with acetone to obtain the chlorinated phthalic anhydride modified ammonium polyacrylate.
6. The preparation method of the water-retaining agent for landscaping soil as claimed in claim 5, wherein the water-retaining agent comprises the following steps:
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 of the ammonium persulfate to the potassium persulfate 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 gas to the ammonium polyacrylate is 1: 1.8-2.2.
7. The preparation method of the water-retaining agent for landscaping soil as claimed in claim 2, wherein the water-retaining agent comprises the following steps:
the preparation method of the water-retaining agent comprises the steps of uniformly mixing acrylic acid, chlorinated phthalic anhydride modified ammonium polyacrylate and water to obtain a mixed solution, adding diethylenetriamine, stirring at 60-70 ℃ for 50-80min, adding half of the total amount of starch, completing the addition within 15-25min, continuing to stir for 25-35min after the addition is completed, adding the rest starch and modified kapok fiber powder, completing the addition within 15-25min, continuing to stir for 50-70min after the addition is completed, and performing granulation after evaporation drying to obtain the water-retaining agent.
8. The preparation method of the water-retaining agent for landscaping soil as claimed in claim 7, wherein the water-retaining agent comprises the following steps:
and (3) granulating, wherein the particle size of the water-retaining agent is 1.2-1.7 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
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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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