CN114258836B - Nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and preparation method thereof - Google Patents
Nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and preparation method thereof Download PDFInfo
- Publication number
- CN114258836B CN114258836B CN202111530998.2A CN202111530998A CN114258836B CN 114258836 B CN114258836 B CN 114258836B CN 202111530998 A CN202111530998 A CN 202111530998A CN 114258836 B CN114258836 B CN 114258836B
- Authority
- CN
- China
- Prior art keywords
- biodegradable polymer
- soilless culture
- culture substrate
- nitrogen
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
Abstract
The invention relates to a nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and a preparation method thereof. The none ofThe soil culture medium is prepared from Ca 2+ And the physical crosslinked network structure formed by the interaction of the biodegradable polymer and the methylol urea through hydrogen bonds serves as a bracket and provides nitrogen nutrient, and the two crosslinked networks form the interpenetrating network polymer composite material. The invention organically combines low-temperature pore-forming and chemical pore-forming, and can effectively regulate and control the pore structure of the prepared biodegradable polymer double-crosslinked hydrogel soilless culture substrate, so that the biodegradable polymer double-crosslinked hydrogel soilless culture substrate not only has expected strength, but also has proper multi-stage holes to meet the requirements of plant respiration and moisture. According to the invention, the hydroxymethyl urea is utilized to release nitrogen nutrient, and the monocalcium phosphate not only can release phosphorus nutrient, but also can be subjected to ionic crosslinking with sodium alginate to form a crosslinked network structure, so that the fertilizer and matrix integration is realized.
Description
Technical Field
The invention relates to the field of soilless culture substrates for plants, in particular to a nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and a preparation method thereof.
Background
Soilless culture is a new vegetable cultivation technology developed in recent decades. At present, the common plastic greenhouse and the sunlight greenhouse are mainly used for soilless cultivation of vegetables, no matched greenhouse regulating and controlling equipment is provided, and the greenhouse environment regulating and controlling level is low; the cost of introducing advanced national equipment is too high.
Most crops are aerobic organisms, depend on stable oxygen supply in the environment, and plant roots are very sensitive to oxygen and have high requirements on soilless culture substrates. Insufficient basal body oxygen is a primary stress factor which seriously affects all organs of plants in early stages, thereby affecting the growth and yield of the plants. The holes of the matrix can inhibit the oxygen supply of the root system and limit the respiration of the root system, so that the energy state of the cells of the root system is seriously reduced, and important metabolic processes of plants are endangered.
Hydrogel is widely studied in the fields of food, agriculture, industry, biomedicine and the like as a functional material with good hydrophilicity, biodegradability and biocompatibility. Recently, some researchers have shown that hydrogels can act as a medium for seed growth, providing moisture and nutrients for seed growth. More than 95% of water in the hydrogel can be gradually released to plant root systems, which indicates that the hydrogel can replace soil to be used as a culture medium for plant seed germination. However, the mechanical properties of the conventional hydrogels are poor, and many efforts have been made to improve the mechanical properties of the hydrogels by the former to develop various types of hydrogels, such as double crosslinked hydrogels, double network hydrogels, organic-inorganic hybrid hydrogels, nanocomposite hydrogels, and the like. The traditional hydrogel soilless culture substrate is not degradable, is easy to cause negative influence on the environment, and the hydrogel soilless culture substrate prepared by utilizing biodegradable polymers such as sodium alginate, polyvinyl alcohol and the like has the advantages of no toxicity, biodegradability, good chemical stability, strong hydrophilicity and the like, and has potential to become an attractive substitute for non-degradable materials.
Disclosure of Invention
The invention aims to provide a nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate which can meet the oxygen, nutrient and moisture requirements of plant roots and has good mechanical properties and can enable plants to vertically grow in the substrate and a preparation method thereof. The preparation process is simple, is easy for large-scale industrial production and has low cost.
The invention is realized by the following technical scheme: a soilless culture substrate of double-crosslinked hydrogel of biodegradable polymer containing nitrogen and phosphorus is prepared from Ca 2+ The physical crosslinked network structure formed by interaction of biodegradable polymer and Methylol Urea (MU) through hydrogen bonds serves as a bracket and provides nitrogen nutrient, and the two components are providedThe crosslinked network forms an interpenetrating network polymer composite.
A preparation method of a nitrogen and phosphorus containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate comprises the following steps:
adding sodium alginate into the aqueous solution of the biodegradable polymer material, uniformly mixing, sequentially adding a pore-forming agent of calcium carbonate, monocalcium phosphate and methylol urea, uniformly mixing, adding a pore-forming auxiliary agent of citric acid, uniformly mixing, and freezing to obtain the nitrogen-and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate with an adjustable pore structure.
As a further improvement of the technical scheme of the preparation method, the calcium carbonate not only can be used as a pore-forming agent and a pore-forming auxiliary agent to generate holes, but also can provide Ca which has an ionic crosslinking reaction with sodium alginate 2+ The mechanical properties of the soilless culture substrate are provided by forming an ion crosslinking network structure.
As a further improvement of the technical scheme of the preparation method, the monocalcium phosphate not only can release phosphorus nutrient, but also can provide Ca which has ion crosslinking reaction with sodium alginate 2+ The mechanical properties of the soilless culture substrate are provided by forming an ion crosslinking network structure.
As a further improvement of the technical scheme of the preparation method, the biodegradable high polymer material is a biodegradable high polymer material which contains polar water-absorbing functional groups on the main chain and can be dissolved in water.
As a further improvement of the technical scheme of the preparation method, the biodegradable polymer material is polyvinyl alcohol (PVA).
As a further improvement of the technical scheme of the preparation method, the mass ratio of the biodegradable polymer material to the sodium alginate is 5:1-25:1.
As a further improvement of the technical scheme of the preparation method, the mass ratio of the sodium alginate to the calcium carbonate is 10:1-50:1.
As a further improvement of the technical scheme of the preparation method, the freezing mode is to freeze the mixed system in liquid nitrogen.
As a further improvement of the technical scheme of the preparation method, the nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate has a macroporous and microporous multistage hole structure.
As a further improvement of the technical scheme of the preparation method, the pore diameter of the macropores is larger than 0.3mm, and the pore diameter of the micropores is smaller than 10 mu m.
The invention effectively combines low-temperature pore-forming and chemical pore-forming, and specifically regulates and controls the mechanism of the pore structure of the double-network hydrogel soilless culture substrate as follows: on the one hand, when the hydrogel is frozen at a low temperature, ice which is formed by water at a low temperature occupies a certain space, and when the hydrogel is placed in a normal temperature environment, the ice melts, and the space occupied by the ice forms physical holes. On the other hand, CO generated by the chemical reaction of the pore-forming agent calcium carbonate and the pore-forming additive citric acid in the preparation process 2 Chemical pore-forming is performed, and the reaction mechanism is as follows. Therefore, the nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate has a macroporous and microporous multistage hole structure. The quantity of the formed holes can be regulated and controlled by the addition amount of the pore-forming agent, and the size of the holes can be regulated and controlled by the total concentration of the solution.
2C 6 H 8 O 7 +3CaCO 3 ＝(C 6 H 5 O 7 ) 2 Ca 3 +3CO 2 +3H 2 O
According to different requirements, a person skilled in the art can prepare the double-crosslinked hydrogel soilless culture substrate with controllable pore structures, which has different mechanical properties and different pore sizes, by controlling the proportion of the biodegradable polymer material and the sodium alginate and the proportion of the sodium alginate and the calcium carbonate. According to the invention, the pore structure of the prepared biodegradable polymer double-crosslinked hydrogel soilless culture substrate is effectively regulated and controlled in a mode of combining low-temperature pore-forming and chemical pore-forming, so that the biodegradable polymer double-crosslinked hydrogel soilless culture substrate not only has expected strength, but also has proper multistage pores to meet the requirements of plant respiration and moisture.
Ca according to the present invention 2+ Ion crosslinking reaction with sodium alginateThe mechanism of the reaction is as follows:
in the nitrogen and phosphorus containing biodegradable polymer hydrogel soilless culture substrate, when the biodegradable polymer material is PVA, hydrogen bond interaction can occur between the biodegradable polymer material and methylol urea, and the specific action mechanism is as follows:
compared with the prior art, the invention has the following advantages:
1) The invention organically combines low-temperature pore-forming and chemical pore-forming, and can effectively regulate and control the pore structure of the prepared biodegradable polymer double-crosslinked hydrogel soilless culture substrate, so that the biodegradable polymer double-crosslinked hydrogel soilless culture substrate not only has expected strength, but also has proper multi-stage holes to meet the requirements of plant respiration and moisture.
2) The methylol urea can form a physical cross-linking network structure with biodegradable polymers through hydrogen bond interaction to serve as a bracket and provide nitrogen nutrient, and the monocalcium phosphate not only can release phosphorus nutrient, but also can be subjected to ion cross-linking with sodium alginate to form an ion cross-linking network structure, so that the fertilizer and matrix integration is realized.
3) The calcium carbonate provided by the invention is ingenious in application, can be used as a pore-forming agent and a pore-forming auxiliary agent to generate holes, and can also be subjected to ionic crosslinking with sodium alginate to form a crosslinked network structure to provide mechanical properties for soilless culture substrates.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is Ca prepared in example 1 2+ SEM contrast map of SA/PVA-MU double-crosslinked hydrogel soilless culture substrate and common SA/PVA hydrogel soilless culture substrate. In the figure, (a) is a hole schematic diagram of a common SA/PVA hydrogel, and (b) is Ca 2+ -schematic representation of the multistage pore of the SA/PVA-MU hydrogel, (c) a partial enlargement of figure (b). Wherein, the pores in the graph (a) are small and dense, the pores in the graph (b) are relatively large, and besides chemical pore formation, the pores formed by freezing and crosslinking of PVA at low temperature are also observed in the graph (c). SEM results show that Ca 2+ The SA/PVA-MU hydrogel has a hierarchical pore structure of macropores and micropores.
FIG. 2 is Ca prepared in example 1 2+ -a microporous pore size distribution map of an SA/PVA-MU double-crosslinked hydrogel soilless culture substrate. As can be seen from fig. 2: the pore diameter obtained by chemically pore-forming assisted PVA low-temperature pore-forming is between 2 and 10 mu m, and the pores are relatively uniformly distributed and are denser.
FIG. 3 is Ca prepared in example 1 2+ -macroporous pore size distribution map of SA/PVA-MU double-crosslinked hydrogel soilless culture substrate. As can be seen from fig. 3: the pore diameter of the superporous hydrogel prepared by a chemical method is between 0.3 and 1.3mm, which is 130 to 150 times that of the common SA/PVA hydrogel.
FIG. 4 is Ca prepared in comparative example 1 2+ SA/PVA double-crosslinked hydrogel and Ca prepared in example 1 2+ FTIR contrast plot of SA/PVA-MU double crosslinked hydrogel. As can be seen from FIG. 4, wave numbers 3481 and 3204cm are known by comparison with MU curve -1 Bimodal ascribed to Ca 2+ N-H stretching vibration of primary amide of MU component in SA/PVA-MU, confirming that MU component is indeed compounded to Ca 2+ In SA/PVA double-crosslinked hydrogels.
FIG. 5 is Ca prepared in comparative example 1 2+ SA/PVA double-crosslinked hydrogel and Ca prepared in example 1 2+ TG comparative analysis graph of SA/PVA-MU double-crosslinked hydrogel.
FIG. 6 is Ca prepared in comparative example 1 2+ SA/PVA double-crosslinked hydrogel and preparation of example 1Prepared Ca 2+ DTG contrast analysis graph of SA/PVA-MU double network hydrogel. As can be seen from the figure: when MU is added to Ca 2+ When SA/PVA double-crosslinked hydrogel, ca 2+ The thermal stability of the SA/PVA-MU double-network hydrogel is reduced to a certain extent. For Ca 2+ SA/PVA double-crosslinked hydrogel, wherein Ca is caused by strong hydrogen bond action among PVA molecular chains 2+ The network arrangement of the SA/PVA double-crosslinked hydrogel molecular chains is relatively regular. But when MU is added to Ca 2+ After SA/PVA double-crosslinked hydrogel, the MU breaks down the hydrogen bond action between PVA molecular chains through the hydrogen bond action between the MU and the PVA molecular chains, so that Ca 2+ The degradation temperature of SA/PVA-MU shifts to the left and MU and Ca 2+ SA/PVA double-crosslinked hydrogels form new hydrogen bond links, which allows Ca 2+ The SA/PVA-MU dual-network hydrogel network is more susceptible to decomposition at lower temperatures.
FIG. 7 is a Ca prepared in example 2+ And (3) a stress-strain curve diagram of the compression strength of the soilless culture substrate caused by different proportions of PVA and SA in the SA/PVA-MU double-crosslinked hydrogel. The compressive strength of the hydrogel increases with increasing PVA: sa=5:1-20:1, because PVA-MU is used as a scaffold, the shape of the hydrogel can be maintained, and sodium alginate and Ca are mixed 2+ Can provide mechanical strength to the hydrogel. When the sodium alginate occupies a relatively large area, ca 2+ Insufficient crosslinking with sodium alginate and redundant sodium alginate can lead to less formed ionic crosslinking network, so the mechanical property of the culture medium is poor. When PVA: sa=25:1, the sodium alginate has too small proportion, resulting in too small number of sodium alginate crosslinked networks, and is difficult to resist external load, so that the mechanical properties of the culture medium are also poor. In summary, the mechanical properties of the PVA, sa=20:1 hydrogels are best.
FIG. 8 shows the rape seedlings at Ca 2+ -growth pattern on SA/PVA-MU double-crosslinked hydrogel soilless culture substrate. As can be seen from the figure, the rape seedlings can be grown on Ca 2+ The SA/PVA-MU double-crosslinked hydrogel grows vertically in the soilless culture substrate, and the hydrogel can meet the oxygen, nutrient and water demands of plant roots as a culture medium.
FIG. 9 is a graph showing germination rate of rape seeds. The figures record different SAs, caCOs 3 (10:1, 20:1, 30:1, 40:1, 50:1) prepared Ca 2+ Soilless culture substrate of SA/PVA-MU double-crosslinked hydrogel, SA: caCO 3 Ca=40:1 2+ -increased germination rate of SA/PVA bi-cross-linked hydrogel soilless culture substrate over time. SA CaCO 3 Ca=40:1 2+ The germination rate of the SA/PVA-MU double-crosslinked hydrogel is highest in 3d, and reaches 100% after 5 d. Adding Ca of MU 2+ The germination growth rate of the SA/PVA-MU double-crosslinked hydrogel soilless culture substrate is integrally better than that of Ca without MU 2+ -SA/PVA double-crosslinked hydrogel soilless culture substrate. SA CaCO 3 Ca=40:1 2+ Seed germination of SA/PVA-MU double-crosslinked hydrogels was better than other media due to SA: caCO 3 Ca=40:1 2+ The SA/PVA-MU double-crosslinked hydrogel has a relatively uniform multi-stage pore structure and proper MU content, and can provide a large amount of moisture, nutrients and oxygen.
FIG. 10 is a graph showing a comparison of the length of roots and shoots of rape seedlings.
FIG. 11 is a graph showing weight comparison of fresh and dry rape seedlings.
As can be seen from FIGS. 10 and 11, at SA, caCO 3 Ca=40:1 2+ On the soilless culture substrate of the SA/PVA-MU double-crosslinked hydrogel, the root system of the sprouted and grown seedling is compared with SA, caCO 3 Ca=40:1 2+ SA/PVA and SA: caCO 3 Ca=10:1, 20:1, 30:1, 50:1 2+ The SA/PVA-MU double-crosslinked hydrogel soilless culture substrate has long and heavy fresh weight. The hydrogel soilless culture substrate with proper holes and MU content is favorable for germination and growth of seeds.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The measurement standards of each performance of the invention are as follows:
determination of compression Properties: according to GB/T1041-92, the mechanical property (compressive strength) of the biodegradable nano polymer composite soilless culture substrate is measured at a compression rate of 4mm/min, the sample is cylindrical, the diameter is 32+/-1 mm, the height is 38+/-1 mm, the surface of the sample is smooth, and the upper surface and the lower surface are parallel. The average of five measurements of the samples was taken and statistical analysis of significant differences between treatments was determined by Duncan multi-range testing.
The specific application method of the double-crosslinked network hydrogel soilless culture substrate comprises the following steps: the rape seeds are placed in the depth of 0.5cm from the surface layer of the double-crosslinked hydrogel soilless culture substrate (the height is 38cm, the diameter is 32 cm), 9 rape seeds are uniformly planted in each culture medium, and each treatment is repeated three times. Determination of germination rate of rape seeds: the number of seed germination was observed and recorded at 1, 2, 3, 4, 5, 6, 7 days, respectively.
Determination of the root and shoot lengths of canola seedlings: destructive sampling was performed in each medium at the end of the cultivation, the lengths of the roots and shoots of rape seedlings were measured with a ruler, and the average result of all the sample measurements was taken.
Determination of fresh and dry weights of rape seedlings: destructive sampling is performed in each culture medium at the end of the cultivation, the mass of the seedlings is the fresh weight, then the seedlings are dried in an oven at 60 ℃ to constant weight, the mass of the weighed seedlings is the dry weight, and the average result of all the sample measurements is taken.
The technical scheme of the invention is described in detail through specific embodiments.
Example 1
Ca 2+ The preparation method of the SA/PVA-MU double-network hydrogel soilless culture substrate comprises the following steps:
preparation of MU: the pH of 40g of formaldehyde was adjusted to 8, 35.6g of urea was added to the formaldehyde solution according to a molar ratio of n (urea)/n (formaldehyde) =1.2:1, and after complete dissolution of urea, the temperature was adjusted to 40℃and reacted for 2 hours to obtain MU solution.
Ca 2+ Preparation of SA/PVA-MU double-crosslinked hydrogelThe preparation method comprises the following steps: adding deionized water into PVA, stirring at 96 ℃ for 1h to completely dissolve the PVA, obtaining 10wt% PVA solution, and naturally cooling to room temperature; 20ml of PVA solution was measured, sodium alginate was added according to PVA: SA=20:1, and after stirring for 1h, calcium carbonate (SA: caCO) was added 3 =40:1), 0.05g of monocalcium phosphate and 0.5ml of MU solution, adding 10ml of 5% citric acid after 1h of reaction, uniformly mixing, freezing in liquid nitrogen, and taking out to obtain Ca 2+ -SA/PVA-MU double-crosslinked hydrogel soilless culture substrate.
Example 2
Preparation of PVA-SA Ca with different proportions 2+ -SA/PVA-MU double-crosslinked hydrogel soilless culture matrix, wherein PVA: sa=5:1, 10:1, 15:1, 20:1, 25:1, other steps are the same as in example 1.
Example 3
Preparation of SA CaCO 3 Ca in different proportions 2+ SA/PVA-MU double-crosslinked hydrogel soilless culture substrate, wherein SA is CaCO 3 =10:1, 20:1, 30:1, 50:1, other steps are the same as in example 1.
Comparative example 1
Ca 2+ The preparation method of the SA/PVA double-crosslinked hydrogel soilless culture substrate comprises the following steps:
adding deionized water into PVA, stirring at 96 ℃ for 1h to completely dissolve the PVA, obtaining 10wt% PVA solution, and naturally cooling to room temperature; 20ml of PVA solution was measured, sodium alginate was added according to PVA: SA=20:1, and after stirring for 1h, calcium carbonate (SA: caCO) was added 3 =40:1) and 0.05g of monocalcium phosphate, adding 10ml of 5% citric acid after 1h of reaction, uniformly mixing, and taking out after freezing by liquid nitrogen to obtain Ca 2+ -SA/PVA double-crosslinked hydrogel soilless culture substrate.
The Ca is 2+ The specific properties and application results of the SA/PVA double-crosslinked hydrogel soilless culture substrate are shown in figures 1-8.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. The preparation method of the nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate is characterized by comprising the following steps of: adding sodium alginate into the aqueous solution of the biodegradable polymer material, uniformly mixing, sequentially adding a pore-forming agent of calcium carbonate, monocalcium phosphate and methylol urea, uniformly mixing, adding a pore-forming additive of citric acid, uniformly mixing, and freezing to obtain the nitrogen-and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate with an adjustable pore structure;
the mass ratio of the biodegradable polymer material to the sodium alginate is 5:1-25:1; the mass ratio of the sodium alginate to the calcium carbonate is 10:1-50:1;
the nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate is prepared from Ca 2+ The physical crosslinked network structure formed by the interaction of the biodegradable polymer and the methylol urea through hydrogen bonds serves as a bracket and provides nitrogen nutrient, and the two crosslinked networks form an interpenetrating network polymer composite material; the nitrogen and phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate has a macroporous and microporous multistage hole structure; the pore diameter of the macropores is larger than 0.3mm, and the pore diameter of the micropores is smaller than 10 mu m.
2. The method for preparing the nitrogen and phosphorus containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate according to claim 1, wherein the calcium carbonate not only serves as a pore-forming agent and a pore-forming auxiliary agent to generate holes, but also provides Ca which is subjected to ionic crosslinking reaction with sodium alginate 2+ The mechanical properties of the soilless culture substrate are provided by forming an ion crosslinking network structure.
3. The method for preparing the nitrogen and phosphorus containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate according to claim 1, wherein the monocalcium phosphate not only releases phosphorus nutrients, but also provides Ca which has ion crosslinking reaction with sodium alginate 2+ The mechanical properties of the soilless culture substrate are provided by forming an ion crosslinking network structure.
4. The method for preparing the nitrogen and phosphorus containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate according to claim 1, wherein the biodegradable polymer material is a biodegradable polymer material which contains polar water-absorbing functional groups on a main chain and can be dissolved in water.
5. The method for preparing the nitrogen and phosphorus containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate according to claim 1, wherein the biodegradable polymer material is polyvinyl alcohol.
6. The method for preparing the nitrogen and phosphorus containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate according to claim 1, wherein the freezing mode is to freeze the mixed system in liquid nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530998.2A CN114258836B (en) | 2021-12-15 | 2021-12-15 | Nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530998.2A CN114258836B (en) | 2021-12-15 | 2021-12-15 | Nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114258836A CN114258836A (en) | 2022-04-01 |
| CN114258836B true CN114258836B (en) | 2023-06-30 |
Family
ID=80827224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111530998.2A Active CN114258836B (en) | 2021-12-15 | 2021-12-15 | Nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114258836B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115836641A (en) * | 2022-12-27 | 2023-03-24 | 广东省农业科学院农业质量标准与监测技术研究所 | Water culture seedling raising method for cruciferae hyper-enriched plants |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106396918A (en) * | 2016-08-31 | 2017-02-15 | 贵州开磷集团股份有限公司 | Preparation method of water culture fertilizer for hydroponic crops |
| EP4252527A3 (en) * | 2017-09-11 | 2024-02-21 | Tomgrow Ltd. | Plant growing container and method |
| CN108395549A (en) * | 2018-03-27 | 2018-08-14 | 河南省科学院能源研究所有限公司 | A kind of high-intensity and high-tenacity antimicrobial form polyvinyl alcohol hydrogel and preparation method thereof |
| CN109251352A (en) * | 2018-08-30 | 2019-01-22 | 太原理工大学 | A kind of polyvinyl alcohol/sodium alginate of structure-controllable/hydroxyapatite porous support preparation method |
| CN109517193B (en) * | 2018-11-19 | 2021-03-16 | 武汉理工大学 | Carboxyethyl chitosan/polyvinyl alcohol self-healing hydrogel and preparation method and application thereof |
| CN111394075B (en) * | 2020-04-17 | 2021-01-08 | 大庆市新万通科技开发有限公司 | Slow-expansion type double-network-structure gel particle profile control agent and preparation method thereof |
| AU2020103185A4 (en) * | 2020-11-02 | 2021-01-14 | Sichuan Agricultural University | Rice seed coating agent and coating method |
| CN112755976A (en) * | 2021-01-12 | 2021-05-07 | 陕西科技大学 | Preparation method and application of double-crosslinked gel sphere adsorption material |
-
2021
- 2021-12-15 CN CN202111530998.2A patent/CN114258836B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114258836A (en) | 2022-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101548638B (en) | Super absorbent soil reclamation plant growth substance and preparation method thereof | |
| CN114258836B (en) | Nitrogen-phosphorus-containing biodegradable polymer double-crosslinked hydrogel soilless culture substrate and preparation method thereof | |
| CN111471464B (en) | Soil conditioner for desert gobi area and application method thereof | |
| CN111040125B (en) | Composite fulvic acid antibacterial sponge matrix and preparation method and application thereof | |
| CN110776926A (en) | Soil water-retaining agent and preparation method thereof | |
| CN109762571B (en) | Soil drought-resistant water-retaining agent, preparation method and use method thereof | |
| KR102555843B1 (en) | Multifunctional hydrogel for soil conditioner, soil conditioner comprising same, and method for manufacturing the same | |
| Wang et al. | From the waste semicoke to superabsorbent composite: Synthesis, characterization and performance evaluation | |
| CN109906911B (en) | Modified soil applied to football field lawn planting and preparation process thereof | |
| CN114902930B (en) | Preparation method of biochar soilless culture substrate | |
| CN113754489B (en) | Multi-effect foliar fertilizer and preparation method thereof | |
| WO2019056024A1 (en) | Nutrient-containing porous biodegradable bead | |
| CN110373209B (en) | Water-retaining agent special for sweet potatoes and water-saving sweet potato cultivation method | |
| CN113337296A (en) | Method for preparing saline-alkali soil improver by using nano carbon material | |
| CN111792961A (en) | Novel water-retaining fertilizer and preparation method thereof | |
| CN112243829A (en) | Seedling transplanting method suitable for mountainous area | |
| CN110591725A (en) | Acid soil improvement additive and preparation method and application thereof | |
| CN114507361B (en) | Agar activated carbon hydrogel for soilless culture seeds and preparation method thereof | |
| CN109169173A (en) | A kind of Schisandra chinensis cutting medium and the breeding method of Schisandra chinensis | |
| CN110313374A (en) | A kind of processing method of biological soil | |
| Eveleens et al. | Wood fiber in pot plant culture; peat replacement up to 50% in volume? | |
| CN117247305A (en) | Hydrogel for promoting plant root growth and preparation method thereof | |
| CN116671416A (en) | Building greening material planting matrix | |
| CN117658733A (en) | Special loss control compound fertilizer for corn and preparation method thereof | |
| CN116806655A (en) | Soilless culture nutrient medium and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |