CN110079327B - Preparation method and application of straw sodium water retention and conditioning material - Google Patents
Preparation method and application of straw sodium water retention and conditioning material Download PDFInfo
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Abstract
The invention discloses a preparation method and application of a straw sodium water retention and conditioning material. The preparation method mainly comprises the following steps: (1) crushing straw raw materials; (2) alkalization; (3) etherification; (4) drying and crushing the product. The method has simple process, wide sources of preparation raw materials, high yield and low cost, and the straw can be directly used as the raw material in the preparation process; the prepared straw sodium material is biodegradable, has good biocompatibility, can increase the water-retaining property of soil, has the growth promotion effect on microorganisms and plant growth, and can realize the waste utilization of straws and high added value utilization.
Description
Technical Field
The invention relates to a preparation method and an application technology of straw sodium, belonging to the field of straw modification and agricultural solid waste resource utilization.
Background
China is a big agricultural country, the straw resources are very rich, and the yield of the straw is about 7 hundred million tons or more every year. The straw is mainly composed of chemical components such as cellulose, hemicellulose, lignin, crude protein, micromolecule carbohydrate and the like, is low in price and rich in source, and is a renewable resource. However, for a long time, the straw resources are not well utilized, and except that part of the straws are used as feed and fertilizer, the straws are mostly disposed by burning and discarding, which not only causes the waste of resources, but also causes pollution to the environment. Therefore, the development of comprehensive utilization of the straws has important practical significance. Meanwhile, China is a country with poor water resources, the arid and semiarid climate areas account for about 51 percent of the national soil area, and drought resistance and soil moisture conservation are important links in agricultural production.
The invention aims to directly utilize straw raw materials to prepare a carboxymethyl straw sodium (straw sodium for short) material with water retention and conditioning functions by a water medium method, and provides a new way for straw modification and resource utilization.
Disclosure of Invention
The invention aims to prepare a carboxymethyl straw sodium material with water retention and conditioning functions by utilizing straw raw materials and grafting carboxymethyl groups on straw derivatization.
In order to achieve the purpose, the invention adopts the following technical scheme:
(1) pretreatment of straw raw materials: removing impurities from the straws, drying, crushing, sieving, and taking straw powder with the granularity of more than or equal to 40 meshes for later use.
(2) Straw alkalization: adding a certain amount of straw powder into a reaction kettle of a kneading machine, and simultaneously adding an alkalizer NaOH aqueous solution to stir the materials so as to uniformly disperse the materials; mixing straw raw materials and an alkalizer NaOH according to the weight ratio of 1: 1.90-1: 2.00, the alkali concentration is 19-21 percent (the density is 265-280g/l), and the solvent-free alkalization is carried out for 1.5h-2.0 under the stirring mode of a kneader at normal temperature;
(3) straw etherification: adding an etherifying agent chloroacetic acid into the alkalized straws for etherification, wherein the adding time is 15-30min, and the preparation method of the etherifying agent is that the ratio of chloroacetic acid to soda is 1: 0.54-1: uniformly mixing the raw materials in a range of 0.60, and controlling the ratio of the straw raw materials to the etherifying agent to be 1: 1.15-1: 1.20, stirring for 10min, and then heating to 40-75 ℃ for etherification for 120 min;
(4) and (3) post-treatment: aging the etherified material in an aging device at normal temperature for 6-8 h;
(5) obtaining straw sodium with certain carboxymethyl substitution degree, directly drying, crushing and packaging; the drying method adopts airflow drying or oven direct drying; the crushing granularity is more than or equal to 60 meshes.
The sources of the straws used in the etherification process are as follows: wheat straw, corn straw, soybean straw, cotton straw or other straw raw materials can be used by one or a mixture of several raw materials.
The alkalization and etherification processes are carried out in a water system.
The etherification process does not need a neutralizer, and the product is obtained by directly drying and crushing.
The carboxymethyl straw sodium (abbreviated as straw) prepared by the invention has a certain carboxymethyl group, and the substitution degree can be controlled between 0.53 and 0.68; the 2% B-type viscosity is 32.6 to 42.6 mPas at 25 ℃.
The application of the straw sodium prepared by the invention is characterized in that: the fertilizer is sprayed or mixed in soil, so that the water-retaining property of the soil can be improved; and as the applied concentration increases, the water retention property increases. Can be applied to soil water-retaining materials and can also be applied to building or geotechnical materials; the straw sodium has viscosity, can be applied to soil dust prevention and soil fixation, and has good market application prospect.
The straw sodium prepared by the invention has good biocompatibility, has a certain growth promotion effect on microorganisms, algae and plants in a proper concentration range, and has a soil conditioning effect.
The straw sodium prepared by the invention is a biodegradable material.
The invention has the beneficial effects that:
(1) the straw raw material used by the invention has wide sources and can be any straw raw material containing cellulose in nature. The straw sodium water retention and conditioning material is prepared by utilizing straw resources, so that high value-added utilization of the straw can be realized, and the aims of changing waste into valuable and recycling the straw waste are fulfilled.
(2) The straw sodium material has simple preparation process and high yield.
(3) The straw sodium material contains nutrient elements such as carbon, nitrogen, phosphorus, potassium and the like required by the growth and development of crops, can condition soil and promote the growth of crops and soil microorganisms.
(5) The straw sodium material provided by the invention can effectively improve the water retention capacity of soil and has biodegradability. Can be used as a water retention and conditioning material in drought soil and has the functions of dust prevention and soil fixation.
Drawings
FIG. 1 is a scanning electron microscope image of sodium straw.
FIG. 2 is an infrared spectrum of straw sodium.
FIG. 3 shows the effect of straw sodium on water retention of soil.
FIG. 4 is a graph showing the effect of straw sodium on soil microorganism counts.
FIG. 5 shows the degradation and utilization of straw sodium by soil microorganisms.
FIG. 6 shows the degradation and utilization of straw sodium by algae.
Detailed Description
The invention is specifically illustrated by the following specific examples of the preparation and application of sodium from wheat straw. However, the present invention is not limited to the specific embodiments listed below, and any modified embodiment is included in the technical scope of the present invention without departing from the scope of the gist.
Example 1: preparation method of carboxymethyl straw sodium (straw sodium for short)
Straw raw materials: wheat straw, corn straw, soybean straw, cotton straw or other straw raw materials can be used by one or a mixture of several raw materials.
Pretreatment of straw raw materials: removing impurities from the straws, drying, crushing, sieving, and taking straw powder with the granularity of more than or equal to 40 meshes for later use.
Slowly adding 1000g of wheat straw powder into a 10L kneading machine, wherein the weight ratio of the raw materials of the straw powder to the alkalizer is 1:1.90, adding an alkalizer aqueous solution into the mixture, wherein the alkali concentration is 19.5% (the density test value is about 268g/l), the straw and the alkalizer are added within 25min under the condition that a kneader is continuously kneaded and stirred at normal temperature, and then the solvent-free alkalization is carried out for 1.5 h; then adding etherifying agent (the preparation method of the etherifying agent is that chloroacetic acid and soda are uniformly mixed in the range of 1: 0.563, the pH value is about 3.6) into the alkalized straws for etherification, the ratio of the straw raw material to the etherifying agent is controlled to be 1:1.18 for mixing, the adding time is 20min, then stirring is continued for 10min, the temperature is raised to 55 ℃, etherification is carried out for 60min, and then the temperature is adjusted to 75 ℃ for high-temperature alkalization for 60 min; after etherification, the material is aged for 6 to 8 hours at normal temperature in an aging device; and then, drying by adopting airflow or directly drying in an oven to obtain carboxymethyl straw sodium, and crushing and sieving by using a 60-mesh sieve to obtain a yellow powdery carboxymethyl straw sodium (straw sodium for short) material. The substitution degree of the carboxymethyl straw sodium is tested according to GB2005, and the carboxymethyl straw sodium DS is 0.53, and the viscosity of 2% B type is 42.6 mPas at 25 ℃.
Example 2: preparation method of carboxymethyl straw sodium
Straw raw materials: wheat straw, corn straw, soybean straw, cotton straw or other straw raw materials can be used by mixing one or more of the raw materials.
Pretreatment of straw raw materials: removing impurities from the straws, drying, crushing, sieving, and taking straw powder with the granularity of more than or equal to 40 meshes for later use. Slowly adding 1001g of wheat straw powder into a 10L kneading machine, wherein the weight ratio of the raw materials of the straw powder to the alkalizer is 1: 1.95, adding an alkalizer aqueous solution into the mixture, mixing the mixture, adding the straw and the alkalizer in 25min under the condition that the kneading machine continuously kneads and stirs under the condition that the concentration of alkali is 20 percent (the density test value is about 269g/l), and then carrying out solvent-free alkalization for 1.5 h; then adding etherifying agent (the preparation method of the etherifying agent is that chloroacetic acid and soda are uniformly mixed in the range of 1: 0.563, the pH value is about 3.6) into the alkalized straws for etherification, the ratio of the straw raw material to the etherifying agent is controlled to be 1:1.19 for mixing, the adding time is 30min, then stirring is continued for 10min, the temperature is raised to 55 ℃, etherification is carried out for 60min, and then the temperature is adjusted to 75 ℃ for high-temperature alkalization for 60 min; after the etherification reaction is finished, the materials are aged for 6 to 8 hours at normal temperature in an aging device; and then, drying by adopting airflow or directly drying in an oven to obtain carboxymethyl straw sodium, and crushing and sieving by using a 60-mesh sieve to obtain a yellow powdery carboxymethyl straw sodium (straw sodium for short) material. The substitution degree of the carboxymethyl straw sodium is tested according to GB2005, and the carboxymethyl straw sodium DS is 0.62, and the viscosity of 2% B type is 40.6 mPas at 25 ℃.
Example 3: preparation method of carboxymethyl straw sodium
Straw raw materials: wheat straw, corn straw, soybean straw, cotton straw or other straw raw materials can be used by mixing one or more of the raw materials.
Pretreatment of straw raw materials: removing impurities from the straws, drying, crushing, sieving, and taking straw powder with the granularity of more than or equal to 40 meshes for later use. 997g of wheat straw powder is slowly added into a 10L kneading machine, and the ratio of the raw materials of the straw powder to the alkalizer is 1:1.90, adding an alkalizer aqueous solution into the mixture, wherein the alkali concentration is 19.7 percent (the density test value is about 269g/l), the straws and the alkalizer are added within 20min under the condition that the kneader is continuously kneaded and stirred, and then the solvent-free alkalization is carried out for 2.0 h; then adding etherifying agent (the preparation method of the etherifying agent is that chloroacetic acid and soda are uniformly mixed in the range of 1: 0.563, the pH value is about 3.6) into the alkalized straws for etherification, the ratio of the straw raw material to the etherifying agent is controlled to be 1:1.19 for mixing, the adding time is 20min, then stirring is continued for 10min, the temperature is raised to 55 ℃, etherification is carried out for 60min, and then the temperature is adjusted to 75 ℃ for high-temperature alkalization for 60 min; after the etherification reaction is finished, the materials are aged for 6 to 8 hours at normal temperature in an aging device; and then, drying by adopting airflow or directly drying in an oven to obtain carboxymethyl straw sodium, and crushing and sieving by using a 60-mesh sieve to obtain a yellow powdery carboxymethyl straw sodium (straw sodium for short) material. The substitution degree of the carboxymethyl straw sodium is tested according to GB2005, and the carboxymethyl straw sodium DS is 0.56, and the viscosity of 2% B type is 40.1 mPas at 25 ℃.
Example 4: preparation method of carboxymethyl straw sodium
Straw raw materials: wheat straw, corn straw, soybean straw, cotton straw or other straw raw materials can be used by one or a mixture of several raw materials.
Pretreatment of straw raw materials: removing impurities from the straws, drying, crushing, sieving, and taking straw powder with the granularity of more than or equal to 40 meshes for later use. Slowly adding 995g of wheat straw powder into a 10L kneading machine, wherein the weight ratio of the raw materials of the straw powder to the alkalizer is 1:1.20, adding an alkalizer aqueous solution into the mixture, wherein the concentration of alkali is 20.5% (the density test value is about 270g/l), the straws and the alkalizer are added in 25min under the condition that the kneader is continuously kneaded and stirred, and then the solvent-free alkalization is carried out for 1.5 h; then adding etherifying agent (the preparation method of the etherifying agent is that chloroacetic acid and soda are uniformly mixed in the range of 1: 0.563, the pH value is about 3.6) into the alkalized straws for etherification, the ratio of the straw raw material to the etherifying agent is controlled to be 1:1.20 for mixing, the adding time is 20min, then stirring is continued for 10min, the temperature is raised to 55 ℃, etherification is carried out for 60min, and then the temperature is adjusted to 75 ℃ for high-temperature alkalization for 60 min; after the etherification reaction is finished, the materials are aged for 6 to 8 hours at normal temperature in an aging device; and then, drying by adopting airflow or directly drying in an oven to obtain a yellow powdery carboxymethyl straw sodium (straw sodium for short) material. The substitution degree of the sodium carboxymethyl straw is tested according to GB2005, and the sodium carboxymethyl straw DS is 0.68, and the viscosity of 2% B type is 32.6 mPas at 25 ℃.
Example 5: preparation method of carboxymethyl straw sodium
Straw raw materials: wheat straw, corn straw, soybean straw, cotton straw or other straw raw materials can be used by one or a mixture of several raw materials.
Pretreatment of straw raw materials: removing impurities from the straws, drying, crushing, sieving, and taking straw powder with the granularity of more than or equal to 40 meshes for later use. Slowly adding 1000g of wheat straw powder into a 10L kneading machine, wherein the weight ratio of the raw materials of the straw powder to the alkalizer is 1: 1.97, adding an alkalizer aqueous solution into the mixture, wherein the concentration of alkali is 20.0 percent (the density test value is about 269g/l), the straws and the alkalizer are added within 20min under the condition that the kneader is continuously kneaded and stirred, and then the solvent-free alkalization is carried out for 1.5 h; then adding etherifying agent (the preparation method of the etherifying agent is that chloroacetic acid and soda are uniformly mixed in the range of 1: 0.563, the pH value is about 3.6) into the alkalized straws for etherification, the ratio of the straw raw material to the etherifying agent is controlled to be 1:1.98, mixing for 20min, then continuously stirring for 10min, heating to 55 ℃, etherifying for 60min, adjusting the temperature to 75 ℃, and alkalizing for 60min at high temperature; after the etherification reaction is finished, the materials are aged for 6 to 8 hours at normal temperature in an aging device; and then, drying by adopting airflow or directly drying in an oven to obtain a yellow powdery carboxymethyl straw sodium (straw sodium for short) material. The substitution degree of the carboxymethyl straw sodium is tested according to GB2005, and the carboxymethyl straw sodium DS is 0.68, and the viscosity of 2% B type is 34.0 mPas at 25 ℃.
FIG. 1 is a scanning electron microscope image of straw sodium material.
FIG. 2 is an infrared spectrum of a straw sodium material. As can be seen from FIG. 2, 3423cm-1The nearby absorption peak is the stretching vibration absorption of OH groupHas a characteristic spectrum band of cellulose, wherein hydroxyl is a component of carbohydrate (such as cellulose, hemicellulose, starch and other polysaccharides and monosaccharides) in the straw; 1742cm-1The absorption peak is C ═ O stretching vibration in carboxylic ester compounds and ketone compounds in the straws; 1604cm-1The nearby absorption peak corresponds to the symmetric/antisymmetric stretching vibration of-COO; 1423cm-1The nearby absorption peak is an aromatic methyl stretching peak, and is caused by deformation vibration of-CH 2 connected with double bonds or carbonyl groups in lignin and aliphatic compounds.
Example 6: application of carboxymethyl straw sodium
1. Water retention property of straw sodium
Air-drying Yanan soil, grinding, sieving with a 0.2mm sieve, and packaging into containers with a soil loading amount of 100 g; preparing 0.5-1% concentration straw sodium, spraying the straw sodium into soil according to the addition amount of the straw sodium of 0 kg/mu, 2 kg/mu and 10 kg/mu respectively, watering and weighing. Weighing every 24 hours at the condition of 25 ℃, calculating the water loss amount every day, and calculating the water retention rate of the soil by the following formula:
water retention of soil%0-Wt)/W0*100％
Wherein W0The water content at day 0 and Wt the water loss at day n.
The measurement result of the water retention property of the straw sodium on the soil is shown in figure 3. As can be seen from FIG. 3, the water retention rate of the experiment group added with straw sodium is higher than that of the control group not added with straw sodium, and the water retention rate increases with the addition amount. Therefore, the straw sodium is an effective water-retaining agent, can be applied to soil water-retaining materials, and can also be applied to building or geotechnical materials.
In addition, the straw sodium has viscosity, so that the cohesive force of soil can be increased, a certain wind prevention and soil fixation effect can be achieved, and the straw sodium can be applied to soil dust prevention and soil fixation.
2. Growth promoting and conditioning effects of straw sodium on plants and microorganisms
Adding straw sodium into a flowerpot filled with 1kg of soil according to the addition amounts of 0.01% and 0.02% respectively, stirring uniformly, and taking no straw sodium as a blank control. Then, 10 wheat seeds were sown in each pot, and the pot was incubated at room temperature and poured with equal amount of water at regular time. Wheat rhizosphere soil samples were collected on day 20 of culture, plated on beef extract peptone medium and martin medium plates, respectively, by dilution plating method, and the microbial counts were counted, and the results are shown in fig. 4. And (4) harvesting the overground part and the underground part of the wheat in the flowerpot on the 40 th day of culture, and weighing the total fresh weight to obtain the wheat biomass.
Beef extract peptone medium: 5.0g of beef extract, 10.0g of peptone, 5.0g of NaCl and 1L of distilled water, and sterilizing at 121 ℃ for 15 min.
Martin's medium: KH (Perkin Elmer)2PO4 1.0g，MgSO4 7H20.5g of O, 10.0g of glucose, 5.0g of peptone and 1L of distilled water, wherein the pH is natural, and the sterilization is carried out at 115 ℃ for 15-20 min.
As can be seen from FIG. 4, the number of the wheat rhizosphere microorganisms on the 2 culture medium plates after the straw sodium is added is higher than that of the control group without the straw sodium. Therefore, the straw sodium has water retention property and contains nutrient elements such as carbon, nitrogen, phosphorus, potassium and the like, so that the biomass and the quantity of rhizosphere microorganisms of wheat can be increased after the straw sodium is added, and the straw sodium has the functions of promoting growth and conditioning.
Wheat biomass survey showed that, after 0.01% and 0.02% straw sodium was added, the fresh weight biomass of wheat increased 2.1% and 141.1% respectively compared to the blank control without straw sodium. Therefore, the straw sodium can promote the growth of wheat after being added, and is a plant growth conditioner.
3. Biodegradability using straw sodium as carbon source
3.1 degradation and utilization of straw sodium as sole carbon source by soil microorganisms
Collecting 500g of Yanan Nangoucun soil sample (Yan soil for short) and Beijing soil sample (Beijing soil for short) in campus of Ringchang university, taking the Yanan soil sample and the Beijing soil sample by a cross method, adding into sterile water according to a ratio of 1:9, and preparing into a dilution with a dilution degree of 10-1The soil suspension of (1). Meanwhile, preparing an inorganic salt liquid culture medium of a unique carbon source with the straw sodium addition amount of 0.5%, filling the inorganic salt liquid culture medium into a triangular flask, filling the inorganic salt liquid culture medium with the liquid volume of 30-50mL, and sterilizing at 121 ℃ for 15-20 min.
The inorganic salt culture medium comprises the following components in percentage by weight: (NH)4)2NO4 1.0g，K2HPO4 0.5g，KH2PO4 0.5g，MgSO4·7H2O 0.2g，NaCl 0.2g，CaCl2 0.1g，MnSO4H2O 0.01g，FeSO4·7H2O0.01 g, distilled water 1L, pH7.0.
Inoculating soil suspension into the inorganic salt culture medium according to the inoculation amount of 3%, culturing in a shaking table at 35 deg.C and rotation speed of 180r/min, and periodically measuring OD600The results are shown in FIG. 5.
As can be seen from FIG. 5, the microorganisms in the soil suspension all grew in the inorganic salt medium with straw sodium as the sole carbon source. OD of microorganism growth in Yanan soil and Beijing soil in inorganic salt culture medium with straw sodium as sole carbon source600The value is 216 percent and 170 percent higher than the control group without straw sodium. The method proves that the microbes in the soil can utilize and degrade the straw sodium, namely the straw sodium is a biodegradable material with good biocompatibility.
3.2 degradation and utilization of straw sodium as sole carbon source by algae
The preparation method of the culture medium with straw sodium as the only carbon source comprises the following steps: preparing BG11 liquid culture medium, subpackaging into 100mL triangular flasks, filling liquid in the triangular flasks by 30-50mL, adding straw sodium according to the mass fractions of 0%, 0.25%, 0.50%, 0.75%, 1.00% and 1.25%, sterilizing at 121 ℃ for 15-20min, and cooling to room temperature.
Inoculation and culture: inoculating the algae separated from the soil according to the inoculation amount of 10%, and culturing at room temperature of 20-25 deg.C for 12 hr per day. The illumination intensity averaged 24.12 KLux. Shake 3 times daily for 3 minutes each time. OD measurement after 20 days of culture440Value, OD calculated according to the following formula400The value is increased by an amount.
ΔOD400Straw sodium test group OD440-straw sodium control OD440
BG11 culture medium formula: stock 1-citric acid 0.3g, ferric ammonium citrate 0.3g, EDTANA20.05g, and constant volume of 100 mL; stock 2-NaNO3 30g，K2HPO4 0.78g，MgSO4·7H2O1.5 g, and the volume is 1000 mL; stock 3-CaCl2·2H2O1.9 g, and the volume is 100 mL; stock 4-Na2CO32g, and fixing the volume to 100 mL; stock 5-H3BO3 2.86g，MnCl2·4H2O 1.81g，ZnSO4·7H2O 0.222g，Na2MnO4·2H2O 0.391g，CuSO4·5H2O 0.079g，Co(NO3)2·6H20.049g of O, and the constant volume is 1000 mL. Stock1 used 2mL, Stock2 used 20mL, Stock3 used 2mL, Stock4 used 1mL, Stock5 used 1mL, made up to 1000mL with distilled or tap water.
The results of the algae degradation and straw sodium utilization experiments are shown in fig. 6. As can be seen from FIG. 6, straw sodium is the only carbon source, and when the concentration is less than or equal to 0.75%, the algae can be degraded and grow by using straw sodium as the carbon source after being cultured for 20 days; when the concentration of the straw sodium is more than 1.00%, the degradation capability of the algae on the straw sodium is reduced. Therefore, the straw sodium can be degraded and utilized by algae as a carbon source in a proper concentration range and is used for growth and propagation of algae, namely the straw sodium is a biodegradable material.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention are within the protective scope of the present invention.
Claims (10)
1. The preparation method of the straw sodium water retention and conditioning material is characterized by comprising the following steps:
(1) pretreatment of straw raw materials: removing impurities from the straws, drying and crushing;
(2) straw alkalization: mixing water with sodium hydroxide, and alkalizing the straws at normal temperature; wherein the straw raw material and sodium hydroxide are mixed according to the proportion of 1: 1.90-1: 2.00, the concentration of the sodium hydroxide is 19-21%, and the density is 265-280 g/l; the reaction time is 1.0-2.0 h;
(3) straw etherification: after alkalization is finished, adding an etherifying agent into the alkalized straws for etherification, wherein the adding time is 15-30min, the ratio of the straw raw materials to the etherifying agent is controlled to be 1: 1.15-1: 1.20, mixing, stirring for 10min, heating to 40-75 ℃, and etherifying for 120 min;
(4) and (3) post-treatment: aging the etherified material in an aging device at normal temperature for 6-8 h;
(5) obtaining straw sodium with certain carboxymethyl substitution degree, directly drying, crushing and packaging;
(6) and (4) measuring the physical and chemical properties of the straw sodium.
2. The preparation method of the straw sodium water retention and conditioning material as claimed in claim 1, which is characterized in that: the straw sources are as follows: wheat straw, corn straw, soybean straw and cotton straw, and one or more of the raw materials can be mixed for use.
3. The preparation method of the straw sodium water retention and conditioning material as claimed in claim 1, which is characterized in that: the crushing in the pretreatment of the straw raw material (1) means that the crushing granularity of the straw is more than or equal to 40 meshes.
4. The preparation method of the straw sodium water retention and conditioning material as claimed in claim 1, which is characterized in that: the process steps of (2) straw alkalization and (3) straw etherification are carried out in a water system.
5. The preparation method of the straw sodium water retention and conditioning material as claimed in claim 1, which is characterized in that: the straw sodium with a certain carboxymethyl substitution degree is obtained in the step (5), and is directly dried and crushed, and the drying method adopts airflow drying or oven direct drying; the crushing refers to that the crushing granularity is more than or equal to 60 meshes.
6. The application of the straw sodium water retention and conditioning material prepared by the preparation method of the straw sodium water retention and conditioning material of any one of claims 1-5.
7. The use of the straw sodium water retention and conditioning material as claimed in claim 6, wherein: the straw sodium water retention and conditioning material is applied to water retention, and can be sprayed or mixed in soil to improve the water retention performance of the soil.
8. The use of the straw sodium water retention and conditioning material as claimed in claim 6, wherein: the application of the straw sodium water retention and conditioning material as a conditioning material has certain growth promotion effect on microorganisms, algae and plants in a proper concentration range.
9. The use of the straw sodium water retention and conditioning material as claimed in claim 6, wherein: the straw sodium water retention and conditioning material is applied to the aspects of wind prevention and soil fixation, and the straw sodium has viscosity and can play a role in soil dust prevention and soil fixation.
10. The application of the straw sodium according to claim 6, wherein: the straw sodium water retention and conditioning material is applied as a degradable material.
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| CN1410451A (en) * | 2001-10-05 | 2003-04-16 | 李长令 | Method of producing carboxy methyl cellulose and xylose using straw |
| CN101220099B (en) * | 2008-01-31 | 2011-01-26 | 重庆力宏精细化工有限公司 | Production method for high viscosity sodium carboxymethylcellulose |
| CN101857639B (en) * | 2010-06-03 | 2012-02-22 | 中国林业科学研究院林产化学工业研究所 | Method for preparing sodium carboxymethylcellulose from residues generated by producing biobutanol from maize straw |
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