CN110591722A - Preparation method of high-water-absorptivity composite resin with functions of preventing soil epidermis from shrinking and reducing water evaporation - Google Patents
Preparation method of high-water-absorptivity composite resin with functions of preventing soil epidermis from shrinking and reducing water evaporation Download PDFInfo
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
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- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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Abstract
The invention discloses a preparation method of a high-water-absorptivity composite resin with functions of preventing soil epidermis from shrinking and reducing water evaporation, which takes cellulose, acrylic acid, acrylamide derivatives and inorganic minerals as raw materials, persulfate as an initiator and N, N-methylene-bisacrylamide as a cross-linking agent, prepares an organic-inorganic composite high-water-absorptivity resin through free radical graft polymerization, and then adds straw powder, the organic-inorganic composite high-water-absorptivity resin and distilled water into clay and/or loess and uniformly stirs the mixture to obtain a soil-based high-water-absorptivity resin composite material. The super absorbent composite resin prepared by the invention can reduce the shrinkage of the soil epidermis, has better performance of reducing water evaporation, can effectively reduce water loss, improves the ecological function of the soil, provides good water and soil conditions for the growth of plants and promotes the growth of vegetation or crops.
Description
Technical Field
The invention relates to a high water-absorbent resin, in particular to a preparation method of a high water-absorbent resin with functions of preventing soil epidermis from shrinking and reducing water evaporation, belonging to the technical field of composite materials and the technical field of water and soil conservation.
Background
With the development of industrialization, the consumption of mineral resources such as petroleum, coal and the like aggravates environmental pollution, and causes environmental quality reduction or ecological imbalance. In the face of increasingly serious environmental problems, for the ecological civilization construction of China, water and soil are kept to show the important status. The water-retaining material plays an important role in the projects of retaining soil moisture, preventing water loss and soil erosion and preventing land desertification. At present, the water retention materials mainly comprise super absorbent resin and mulching films. The mulching film is high in use price, difficult to degrade and easy to cause environmental pollution, and is limited to be used in windy desert areas. The super absorbent resin is a functional polymer material with strong hydrophilic groups and a three-dimensional network structure, and has excellent water absorption performance and good water retention performance. Therefore, the application of the super absorbent resin as a water retention material has attracted great attention of researchers.
Soil moisture evaporation refers to the process by which moisture in the soil is converted from a liquid to a gas into the atmosphere. It is related to external meteorological conditions such as temperature, humidity, wind speed and rainfall. Excessive or insufficient soil moisture has certain effects on both plants and microorganisms. The irregular three-dimensional network structure of the super absorbent resin ensures that the super absorbent resin has stronger water absorption capacity and can repeatedly absorb hundreds of times and even thousands of times of water of the self weight. The water-absorbing material swells into hydrogel after absorbing water, slowly releases water for crops to absorb and utilize, and is an excellent drought-resistant water-saving material. In northwest areas, it is of great significance to improve the utilization efficiency of soil moisture. If the evaporation loss of soil moisture can be inhibited, especially in arid areas, the method has important significance for inhibiting evaporation, prolonging the time of moisture in soil and improving the water utilization efficiency. The high water absorption resin is an important means for achieving the purpose.
Disclosure of Invention
The invention aims to provide a high water-absorbing resin composite material with functions of preventing soil epidermis from shrinking and reducing water evaporation and a preparation method thereof.
Preparation of high water absorption composite resin
(1) The preparation method of the organic-inorganic composite super absorbent resin comprises the steps of stirring and dispersing cellulose in distilled water under the protection of nitrogen, adding inorganic minerals, stirring uniformly, heating to 60 ~ 80 ℃ and keeping for 30 ~ 60min, cooling to 45 ~ 55 ℃, adding persulfate aqueous solution, stirring for 5 ~ 20 min, adding a mixed solution of acrylic acid, acrylamide derivatives and N, N-methylene bisacrylamide, heating to 60 ~ 80 ℃ and reacting at a constant temperature for 2 ~ 5h, drying the obtained product at 50 ~ 80 ℃ after the reaction is finished until the weight is constant, crushing, and sieving with a 40 ~ 80 sieve to obtain the organic-inorganic composite super absorbent resin.
The degree of neutralization of the acrylic acid was 55 ~ 95%.
The cellulose is one of sodium carboxymethyl cellulose, sodium hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, ethyl cellulose and sodium hydroxypropyl methyl cellulose, and the cellulose is used as a polymerization monomer, so that the acrylic acid-containing acrylic acid copolymer has the advantages of wide source, low toxicity, low cost, biodegradability, biocompatibility and the like, and the dosage of the cellulose is 5 ~ 15wt% of the mass of acrylic acid.
The inorganic mineral is one of montmorillonite, kaolin, laterite, loess and attapulgite, the introduction of the inorganic mineral can reduce the production cost and improve the expansion capacity, the thermal stability and the gel strength of the inorganic mineral, and the use amount of the inorganic mineral is 1 ~ 12 wt% of the mass of acrylic acid.
The initiator persulfate is ammonium persulfate or potassium persulfate, and the using amount of the persulfate is 0.4 ~ 1.0.0 wt% of the mass of the acrylic acid.
The acrylamide derivative is one of diacetone acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, N-isopropylacrylamide, N-hydroxymethyl acrylamide and N-hydroxyethyl acrylamide, the introduction of the acrylamide derivative can improve the salt resistance of the super absorbent resin, and the using amount of the acrylamide derivative is 12 ~ 30 wt% of the mass of acrylic acid.
The amount of the cross-linking agent N, N-methylene-bisacrylamide is 0.05 ~ 0.15.15 wt% of the mass of the acrylic acid.
(2) Preparation of the high water absorption composite resin: adding straw powder into clay or/and loess, mixing the organic-inorganic composite super absorbent resin with distilled water, and stirring to obtain the final product, i.e. super absorbent composite resin with functions of preventing soil surface from shrinking and reducing water evaporation.
The clay is laterite, attapulgite, montmorillonite and kaolin, when the clay and the loess are mixed, the mass ratio of the clay to the loess is 1:0.2 ~ 1:5, the clay and the loess are dried after impurities are removed and crushed to 100 ~ 200 meshes, the clay and the loess are used as raw materials, the production cost of the soil-based material can be well reduced, and in addition, the clay or the loess can provide necessary nutrient substances for the sand plants to enable the sand plants to grow rapidly.
The straw powder is prepared by crushing wheat straws, corn straws and cotton straws to 40 ~ 80 meshes, wherein the addition amount of the straw powder is 3 ~ 12 wt% of the mass of clay or/and loess, the addition amount of the organic-inorganic composite super absorbent resin is 0.01 ~ 0.5.5 wt% of the mass of the clay or/and loess, and the addition amount of distilled water is 60 ~ 80 wt% of the mass of the clay or/and loess.
Secondly, the structure and the performance of the super absorbent resin
The structure and properties of the super absorbent resin of the present invention will be analyzed and explained below by taking cellulose-graft-poly (acrylic acid-co-2-acrylamido-2-methylpropanesulfonic acid)/inorganic mineral as an example.
FIG. 1 shows the IR spectra of cellulose (a), 2-acrylamido-2-methylpropanesulfonic acid (b), cellulose-graft-poly (acrylic acid-co-2-acrylamido-2-methylpropanesulfonic acid) (c), cellulose-graft-poly (acrylic acid-co-2-acrylamido-2-methylpropanesulfonic acid)/inorganic mineral (d), respectively. It can be seen that 1128 cm in the infrared spectrum of cellulose-1And 1031 cm-1The absorption peak is attributed to C-OH bond stretching vibration, and basically disappears after the polymerization reaction, which indicates that the C-OH of the cellulose participates in the chemical reaction. 1663 cm in the infrared spectrogram of 2-acrylamido-2-methylpropanesulfonic acid-1Is a stretching vibration peak of C = O in amide group, 1083 cm-1The absorption peaks are symmetrical stretching vibration peaks of sulfonic acid groups, and the intensities of the absorption peaks in the infrared spectrums of cellulose-graft-poly (acrylic acid-copolymerization-2-acrylamide-2-methylpropanesulfonic acid) and cellulose-graft-poly (acrylic acid-copolymerization-2-acrylamide-2-methylpropanesulfonic acid)/inorganic minerals are weakened; 632 cm-1The stretching vibration absorption peak at the sulfonic acid group O = S was shifted in position after polymerization, indicating that the cellulose was successfully grafted with 2-acrylamide-2-methylpropanesulfonic acid. In FIG. 1c and FIG. d, 1456 cm can be observed respectively-1And 1411 cm-1The asymmetric stretching vibration peak at-COO-, indicating that the polyacrylic acid chains have been grafted onto the cellulose backbone. 3433 cm in d-curve-1The absorption peak at O-H and 3435 cm in the c curve-1Increased intensity compared to the absorption peak; in the d curve, 465 cm was found-1The bending vibration peak of Si-O-Si of the inorganic mineral indicates that the inorganic mineral participates in graft copolymerization.
Fig. 2 is a scanning electron microscope image of cellulose (a), cellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide) (b), cellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide)/inorganic mineral (c), respectively. As shown in fig. 2, the cellulose exhibits a smooth, flat and dense surface topography; the surface of cellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide) was relatively rough and some holes were present; the super absorbent resin prepared after the inorganic mineral is introduced has rough surface, more holes and even distribution. These results indicate that the inorganic mineral participates in the polymerization reaction, and the pore structure facilitates the entry of water molecules into the three-dimensional structure of the resin, improving the water absorption.
Third, the property of the super absorbent composite resin for preventing the contraction of the soil epidermis and reducing the water evaporation
A plastic box with the same specification (20.5 multiplied by 13.2 multiplied by 6.5 cm) is taken, a layer of soil is firstly paved on the bottom of the box, the same amount of tap water is added, and then the same amount of soil-based super absorbent resin composite material samples (viscous turbid liquid) are respectively paved on the upper layer of the soil. Weighing the mass of the sample by using an electronic balance every 2-4 hours under a natural condition, recording data and calculating the evaporation rate; after the material was completely dried, the length and width of the material were measured and the shrinkage was calculated.
FIG. 3 is a graph of the effect of methylcellulose-graft-poly (acrylic acid-co-diacetone acrylamide)/attapulgite and superabsorbent resin content on soil moisture evaporation rate, where graph a is a whole graph and graph b is a partial enlarged view, at 60.5h in Table 1, the evaporation rate reduction values of composites prepared with different amounts of methylcellulose-graft-poly (acrylic acid-co-diacetone acrylamide)/attapulgite superabsorbent resin increase when the superabsorbent resin content is 0.010% to 0.36%, as can be seen from FIG. 3 and Table 1, the evaporation rate reduction values of soil-based superabsorbent resin composites increase when the superabsorbent resin content continues to increase, the evaporation rate reduction values decrease when the superabsorbent resin content continues to increase, the evaporation rate reduction values are greatest when left at natural conditions for 60.5h, the evaporation rate reduction values of superabsorbent resin content is 0.29 ~ 0.36.36%, the effect of the soil moisture absorption resin content decreases as the water absorption void content increases, and the soil moisture absorption coefficient decreases as a result of soil moisture absorption coefficient increases, the soil moisture absorption coefficient decreases more than when the soil moisture absorption resin content increases, the soil moisture absorption coefficient decreases.
FIG. 4 is a graph showing the effect of hydroxyethyl cellulose-graft-poly (acrylic acid-co-N-methylolacrylamide)/montmorillonite superabsorbent resin content on soil moisture evaporation rate, where a is a whole graph and b is a partial enlarged view, at 58 h in Table 2, the evaporation rate reduction values of composites prepared by adding different amounts of hydroxyethyl cellulose-graft-poly (acrylic acid-co-N-methylolacrylamide)/montmorillonite superabsorbent resin increase when the superabsorbent resin content is from 0.010% to 0.40%, from FIG. 4 and Table 2, it can be seen that the evaporation rate reduction value of soil-based superabsorbent resin composites increases as the superabsorbent resin content continues to increase to 0.50%, the evaporation rate reduction value decreases as the superabsorbent resin content continues to increase for 58 h in natural conditions, the evaporation rate reduction value is greatest for composites having a superabsorbent resin content of 0.30 ~ 0.40.40%, the evaporation rate decreases by 7.13%, possibly as the superabsorbent resin content increases, the void retention around the superabsorbent resin increases, and the soil moisture absorption coefficient decreases as the soil moisture content increases, the soil moisture absorption coefficient decreases as a result of the soil moisture absorption coefficient decreases from atmospheric moisture absorption coefficient decreases, the soil moisture absorption coefficient decreases as the soil moisture content increases, the soil moisture absorption coefficient decreases, and the soil moisture absorption coefficient decreases as a result of the soil moisture absorption coefficient increases, the soil moisture absorption coefficient decreases, and the soil moisture absorption coefficient decreases, increases, and the soil moisture absorption coefficient decreases, and the soil moisture absorption coefficient.
Fig. 5 is a graph showing the effect of the content of hydroxypropyl methylcellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide)/kaolin superabsorbent resin on the soil moisture evaporation rate, where a is a whole graph and b is a partial enlarged view, at 63.5 h in table 3, the evaporation rate reduction values of composites prepared by adding different amounts of hydroxypropyl methylcellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide)/kaolin superabsorbent resin show an increasing trend at a superabsorbent resin content of 0.29% to 0.29%, as can be seen from fig. 5 and table 3, the evaporation rate reduction values of soil-based superabsorbent resin composites show a decreasing trend at a superabsorbent resin content of 0.50% to 0.29%, as the superabsorbent resin content continues to increase to 0.50%, as the evaporation rate reduction values are greatest at a natural condition of 63.5 h, the superabsorbent resin content of 0.22 ~ 0.29% decreases, as the void retention of superabsorbent resin content increases to ~ 0.50%, the effect of soil moisture absorption resin is likely to increase as the soil moisture content of the soil-retention hydrogel decreases, and as a result, the soil moisture absorption coefficient of soil moisture content of the soil-retention property decreases to increase in soil moisture absorption resin, the soil moisture absorption material, and water absorption property is likely to increase in accordance with the soil moisture absorption property of soil moisture retention property of soil.
In conclusion, the super absorbent composite resin prepared by the invention can reduce the shrinkage of the soil epidermis, has better performance of reducing water evaporation, can effectively reduce water loss, improves the ecological function of soil, provides good water and soil conditions for the growth of plants, and promotes the growth of vegetation or crops. The use of soil in arid areas not only can reduce the evaporation rate of the soil and improve the soil moisture content, but also can effectively prevent the soil from chapping and shrinking and reduce the water and soil loss, thereby being beneficial to the growth of vegetation or crops.
Drawings
FIG. 1 is an infrared spectrum of a super absorbent resin prepared by the present invention.
FIG. 2 is a scanning electron micrograph of cellulose and a prepared super absorbent resin.
FIG. 3 shows the effect of the content of methylcellulose-graft-poly (acrylic acid-co-diacetone acrylamide)/attapulgite high water-absorbent resin on the water evaporation rate of soil.
FIG. 4 shows the effect of the content of hydroxyethyl cellulose-graft-poly (acrylic acid-co-N-hydroxymethyl acrylamide)/montmorillonite super absorbent resin on the water evaporation rate of soil.
FIG. 5 is a graph showing the effect of the content of hydroxypropyl methylcellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide)/kaolin superabsorbent resin on the soil moisture evaporation rate.
Detailed Description
The preparation and application of the soil-based super absorbent resin composite of the present invention will be further described with reference to the following specific examples.
Example 1 preparation of a methylcellulose-graft-poly (acrylic acid-co-diacetone acrylamide)/attapulgite superabsorbent resin composite
(1) 30 mL of distilled water and 0.576 g of methyl cellulose were put in a four-necked flask equipped with a mechanical stirrer, and stirred uniformly to obtain a dispersion. Under continuous stirring, 0.72 g of attapulgite was added and the solution was heated to 60 ℃ and held for 60 min. The reaction was cooled to 50 ℃, 0.0432 g of potassium persulfate (dissolved in 4 mL of water) was added, and after stirring for 10 min, a mixed solution containing 7.2g of acrylic acid (degree of neutralization 60%), 1.08 g of diacetone acrylamide and 0.0072 g N, N-methylene bisacrylamide was dropped into the above system, followed by slowly raising the temperature to 80 ℃ and reacting at a constant temperature for 3 h. The nitrogen gas is used for protection in the whole experimental process. After the reaction is finished, drying the obtained product at 70 ℃ to constant weight, crushing, and sieving by a 40-mesh sieve to obtain the super absorbent resin;
(2) removing impurities from attapulgite, drying, and pulverizing to 100 ~ 200 mesh;
(3) adding a certain amount of treated attapulgite into straw powder with the mass of 3 ~ 8 wt%, super absorbent resin with the mass of 0.01 ~ 0.5.5 wt% and distilled water with the mass of 60 ~ 80 wt%, and stirring at the stirring speed of 200 ~ 300 r/min for 30 ~ 60min to obtain a super absorbent resin composite material (viscous turbid liquid);
(4) and (3) taking the high water absorption resin composite material sample (viscous turbid liquid), uniformly spreading the sample on the upper layer of the soil, and pressing to form a soil-based water retention layer. Weighing the mass of the mixture under a natural condition and calculating the evaporation rate; after the material was completely dried, the length and width of the material were measured and the shrinkage was calculated. Table 4 shows the soil skin shrinkage of composites prepared with different amounts of methylcellulose-graft-poly (acrylic acid-co-diacetone acrylamide)/attapulgite super absorbent resin.
Example 2 preparation of hydroxyethyl cellulose-graft-poly (acrylic acid-co-N-hydroxymethyl acrylamide)/montmorillonite super absorbent resin composite
(1) 40 mL of distilled water and 0.864 g of hydroxyethyl cellulose were put into a four-necked flask equipped with a mechanical stirrer, and stirred uniformly to obtain a dispersion. With continuous stirring, 0.144 g of montmorillonite was added and the solution was heated to 80 ℃ and held for 30 min. The reaction mass is cooled to 50 ℃, 0.072 g potassium persulfate (dissolved in 7 mL water) is added, after stirring for 10 min, the mixed solution containing 7.2g acrylic acid (neutralization degree is 80%), 1.44 g N-hydroxymethyl acrylamide and 0.0108 g N, N-methylene bisacrylamide is dripped into the system, and then the temperature is slowly raised to 60 ℃ for reaction for 5h at constant temperature. The nitrogen gas is used for protection in the whole experimental process. After the reaction is finished, drying the obtained product at 80 ℃ to constant weight, crushing, and sieving by a 40-mesh sieve to obtain the super absorbent resin;
(2) removing impurities from montmorillonite, drying, and pulverizing to 100 ~ 200 mesh;
(3) taking a certain amount of treated montmorillonite, adding straw powder with the mass of 3 ~ 8 wt%, super absorbent resin with the mass of 0.01 ~ 0.5.5 wt% and distilled water with the mass of 60 ~ 80 wt%, and stirring for 30 ~ 60min at the stirring speed of 200 ~ 300 r/min to obtain the soil-based super absorbent resin composite material (viscous turbid liquid);
(4) a sample (viscous turbid liquid) of the super absorbent resin composite material is taken and evenly spread on the upper layer of the soil, and is pressed to form a soil-based water retention layer. Weighing the mass of the mixture under a natural condition and calculating the evaporation rate; after the material was completely dried, the length and width of the material were measured and the shrinkage was calculated. Table 5 shows the soil skin shrinkage of composites prepared with different amounts of hydroxyethyl cellulose-graft-poly (acrylic acid-co-N-methylolacrylamide)/montmorillonite superabsorbent.
Example 3 preparation of hydroxypropyl methylcellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide)/Kaolin super absorbent composite resin
(1) 35 mL of distilled water and 0.72 g of hydroxypropylmethylcellulose were charged into a four-necked flask equipped with a mechanical stirrer, and stirred uniformly to obtain a dispersion. With continuous stirring, 0.576 g of kaolin was added and the solution was heated to 80 ℃ and held for 30 min. The reaction mass was cooled to 50 ℃, 0.0576 g of potassium persulfate (dissolved in 6 mL of water) was added, and after stirring for 10 min, a mixed solution containing 7.2g of acrylic acid (degree of neutralization 70%), 1.8 g N-isopropylacrylamide and 0.0087 g N, N-methylenebisacrylamide was dropped into the above system, followed by slowly raising the temperature to 60 ℃ and reacting at a constant temperature for 5 h. The nitrogen gas is used for protection in the whole experimental process. After the reaction is finished, drying the obtained product at 60 ℃ to constant weight, crushing, and sieving by a 40-mesh sieve to obtain the super absorbent resin;
(2) removing impurities from kaolin, drying, and pulverizing to 100 ~ 200 mesh;
(3) taking a certain amount of treated kaolin, adding straw powder with the mass of 3 ~ 8 wt%, super absorbent resin with the mass of 0.01 ~ 0.5.5 wt% and distilled water with the mass of 60 ~ 80 wt%, and stirring at the stirring speed of 200 ~ 300 r/min for 30 ~ 60min to obtain super absorbent composite resin (viscous turbid liquid);
(4) and (3) taking the high water absorption composite resin sample (viscous turbid liquid), uniformly spreading the high water absorption composite resin sample on the upper layer of soil, and pressing to form a soil-based water retention layer. Weighing the mass of the mixture under a natural condition and calculating the evaporation rate; after the material was completely dried, the length and width of the material were measured and the shrinkage was calculated. Table 6 shows the soil skin shrinkage of composites prepared with different amounts of hydroxypropyl methylcellulose-graft-poly (acrylic acid-co-N-isopropylacrylamide)/kaolin superabsorbent resin.
Claims (10)
1. A preparation method of a high water absorption composite resin with the functions of preventing the contraction of soil epidermis and reducing the evaporation of water comprises the following steps:
(1) the preparation of the organic-inorganic composite super absorbent resin comprises the steps of stirring and dispersing cellulose in distilled water under the protection of nitrogen, adding inorganic minerals, stirring uniformly, heating to 60 ~ 80 ℃ and keeping for 30 ~ 60min, cooling to 45 ~ 55 ℃, adding persulfate aqueous solution, stirring for 5 ~ 20 min, adding a mixed solution of acrylic acid, acrylamide derivatives and N, N-methylene bisacrylamide, heating to 60 ~ 80 ℃ and reacting at a constant temperature for 2 ~ 5h, drying the obtained product at 50 ~ 80 ℃ after the reaction to constant weight, crushing, and sieving with a 40 ~ 80 sieve to obtain the organic-inorganic composite super absorbent resin;
(2) preparation of the high water absorption composite resin: adding straw powder into clay or/and loess, mixing the organic-inorganic composite super absorbent resin prepared in the step (1) with distilled water, and stirring uniformly to obtain the target product, namely the super absorbent composite resin with the functions of preventing soil epidermis from shrinking and reducing water evaporation.
2. The process for producing a super absorbent composite resin having the function of preventing shrinkage of soil surface and reducing evaporation of water according to claim 1, wherein the neutralization degree of acrylic acid in the step (1) is 55 ~ 95%.
3. The method for preparing a super absorbent composite resin with the functions of preventing the contraction of the soil epidermis and reducing the evaporation of water according to claim 1, wherein in the step (1), the cellulose is one of sodium carboxymethyl cellulose, sodium hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, ethyl cellulose and sodium hydroxypropyl methyl cellulose, and the amount of the cellulose is 5 ~ 15wt% of the mass of acrylic acid.
4. The method for preparing a super absorbent composite resin with the functions of preventing the contraction of the soil epidermis and reducing the evaporation of water according to claim 1, wherein in the step (1), the inorganic mineral is one of montmorillonite, kaolin, laterite, loess and attapulgite, and the amount of the inorganic mineral is 1 ~ 12 wt% of the mass of acrylic acid.
5. The process for producing a super absorbent composite resin having the function of preventing shrinkage of soil surface and reducing evaporation of water according to claim 1, wherein in the step (1), the persulfate is ammonium persulfate or potassium persulfate, and the amount of the persulfate is 0.4 ~ 1.0.0 wt% based on the mass of acrylic acid.
6. The method for preparing a super absorbent composite resin having the function of preventing shrinkage of soil epidermis and reducing water evaporation according to claim 1, wherein in the step (1), the acrylamide derivative is one of diacetone acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, N-isopropylacrylamide, N-methylolacrylamide and N-hydroxyethyl acrylamide, and the amount of the acrylamide derivative is 12 ~ 30 wt% based on the mass of acrylic acid.
7. The process for producing a super absorbent composite resin having the function of preventing shrinkage of soil surface and reducing evaporation of water according to claim 1, wherein in the step (1), the amount of N, N-methylenebisacrylamide as a crosslinking agent is 0.05 ~ 0.15.15 wt% based on the mass of acrylic acid.
8. The method for preparing a super absorbent composite resin with the functions of preventing the contraction of the soil skin and reducing the evaporation of water according to claim 1, wherein the clay is laterite, attapulgite, montmorillonite or kaolin in the step (2), and when the clay is mixed with loess, the mass ratio of the clay to the loess is 1:0.2 ~ 1: 5.
9. The method for preparing a super absorbent composite resin having the functions of preventing the shrinkage of the soil skin and reducing the evaporation of water according to claim 1, wherein the straw powder is the powder obtained by pulverizing wheat straw, corn straw and cotton straw to 40 ~ 80 mesh in the step (2), and the amount of the straw powder is 3 ~ 12 wt% of the mass of clay and/or loess.
10. The method for preparing a super absorbent composite resin having the function of preventing shrinkage of soil skin and reducing evaporation of water according to claim 1, wherein the organic-inorganic composite super absorbent resin is added in an amount of 0.01 ~ 0.5.5 wt% based on the mass of clay or/and loess and the distilled water is added in an amount of 60 ~ 80 wt% based on the mass of clay or/and loess in the step (2).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471137A (en) * | 2020-01-17 | 2020-07-31 | 内蒙古农业大学 | High water-absorbent resin and preparation method and application thereof |
| CN111826164A (en) * | 2020-05-06 | 2020-10-27 | 中国水利水电科学研究院 | Mixed biological powder and method for reducing soil moisture evaporation |
| CN111820056A (en) * | 2020-05-06 | 2020-10-27 | 中国水利水电科学研究院 | Method for reducing soil moisture evaporation by utilizing elm powder |
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| CN112876307A (en) * | 2021-01-21 | 2021-06-01 | 西北师范大学 | Degradable super absorbent resin with nitrogen fertilizer slow-release effect and preparation method thereof |
| CN114920606A (en) * | 2022-04-27 | 2022-08-19 | 兰州石化职业技术学院 | Preparation method of adsorption type degradable soil moisture preservation slow release fertilizer based on modified wheat straw |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111471137A (en) * | 2020-01-17 | 2020-07-31 | 内蒙古农业大学 | High water-absorbent resin and preparation method and application thereof |
| CN111826164A (en) * | 2020-05-06 | 2020-10-27 | 中国水利水电科学研究院 | Mixed biological powder and method for reducing soil moisture evaporation |
| CN111820056A (en) * | 2020-05-06 | 2020-10-27 | 中国水利水电科学研究院 | Method for reducing soil moisture evaporation by utilizing elm powder |
| CN112876307A (en) * | 2021-01-21 | 2021-06-01 | 西北师范大学 | Degradable super absorbent resin with nitrogen fertilizer slow-release effect and preparation method thereof |
| CN112646381A (en) * | 2021-01-22 | 2021-04-13 | 西北师范大学 | Preparation and application of high-molecular evaporation-preventing temperature-control material |
| CN114920606A (en) * | 2022-04-27 | 2022-08-19 | 兰州石化职业技术学院 | Preparation method of adsorption type degradable soil moisture preservation slow release fertilizer based on modified wheat straw |
| CN114920606B (en) * | 2022-04-27 | 2024-01-12 | 兰州石化职业技术学院 | Preparation method of adsorption type degradable soil moisture conservation slow release fertilizer based on modified wheat straw |
| CN115259942A (en) * | 2022-07-29 | 2022-11-01 | 青岛农业大学 | Polymerized salt-tolerant water-retention fertilizer and preparation method thereof |
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