CN108976344B - Preparation method of starch-based hygroscopic resin - Google Patents
Preparation method of starch-based hygroscopic resin Download PDFInfo
- Publication number
- CN108976344B CN108976344B CN201810918361.2A CN201810918361A CN108976344B CN 108976344 B CN108976344 B CN 108976344B CN 201810918361 A CN201810918361 A CN 201810918361A CN 108976344 B CN108976344 B CN 108976344B
- Authority
- CN
- China
- Prior art keywords
- starch
- weight
- mixture
- solution
- moisture absorption
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
- C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
- C08B30/18—Dextrin, e.g. yellow canari, white dextrin, amylodextrin or maltodextrin; Methods of depolymerisation, e.g. by irradiation or mechanically
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Graft Or Block Polymers (AREA)
Abstract
The invention discloses a preparation method of starch-based hygroscopic resin, which comprises the following steps: step one, adding water which is 3-30 times of the weight of starch into 1 part of starch, stirring and wetting the mixture, gelatinizing the mixture at 40-90 ℃ for 10-90 minutes, step two, adding sodium acrylate solution which is 5-50 times of the weight of starch and has the weight percentage concentration of 10-80% into the mixture obtained in the step one, uniformly stirring the mixture, step three, adding an initiator which is 0.02-0.6 times of the weight of starch into the mixture obtained in the step two in the form of aqueous solution, reacting the mixture at 50-80 ℃ for 60-180 minutes, drying, crushing and screening the hygroscopic resin. Compared with the prior art, the preparation method for preparing the hygroscopic resin disclosed by the invention is simple, the production flow is simplified, the raw material consumption is reduced, and the production cost is reduced.
Description
Technical Field
The invention relates to a preparation method of starch graft polymer hygroscopic resin, in particular to a preparation method of starch-based hygroscopic resin, belonging to the field of fine chemical engineering.
Background
Grain, dry fruit, tea, food, medicine, historical relic etc. all have specific requirements to humidity in the storage process, therefore in the storage process, it is vital to keep suitable humidity, and moisture-absorbing material plays an important role, and to human living environment, it is also very important to improve human comfort level to adjust humidity. Commonly used moisture-absorbing materials are mainly classified into inorganic moisture-absorbing materials, organic moisture-absorbing materials, and composite moisture-absorbing materials. Common inorganic desiccants such as lithium chloride, calcium oxide, calcium chloride, magnesium chloride and the like have large moisture absorption capacity and high moisture absorption speed, but are liquid after moisture absorption balance is achieved, so that the use is inconvenient; silica gel, activated carbon and the like are also common hygroscopic substances, but the hygroscopic capacity is small; organic moisture-absorbing materials fall into two categories, one is synthetic polymers such as polyacrylamides and polyacrylic acid-based moisture-absorbing materials, one is natural polymers such as natural starch granules, which have been very early used for the production of anhydrous alcohol, and Michael R l. Enzyme and Microbial Technology, 1997, 20: 162-; the composite moisture absorption material is obtained by reacting or blending an organic moisture absorption material with an inorganic substance, for example, natural minerals such as montmorillonite, zeolite, calcium chloride and the like are blended or reacted with the organic moisture absorption material, and the blended composite moisture absorption material has the defect that the composite moisture absorption material is likely to be in a liquid state when the moisture absorption amount is large.
Lewanfen et al reported their work at "agricultural engineering journal" Vol.22, No. 11: konjac glucomannan-acrylic acid graft copolymer (KSAP) and general desiccants such as silica gel and montmorillonite have moisture absorption characteristics under several environmental humidities, and the desorption performance of the copolymer in a dry environment (RH (10 +/-1)%, (25 +/-1) ° C) after moisture absorption is analyzed.
Starch is the most important natural polymer, has wide sources and low price, is renewable, but the moisture absorption rate of the natural starch is low, so people want to improve the moisture absorption performance of the starch, and an article 'porous starch preparation method and research progress of application thereof' on page 102 of 17 th of Guangdong chemical 2015 summarizes the porous starch preparation method, such as preparation of porous flour by using amylase, a physical method or a chemical method, aiming at increasing the affinity of the starch for water, but has high cost and undesirable effect.
The modification of starch is an important method for improving the performance of starch, and in the chemical modification method, more graft modification is carried out, such as graft copolymerization of starch and acrylonitrile, acrylamide, acrylic acid and the like, and then subsequent treatment is carried out, so that the super absorbent resin can be obtained.
CN 106188404A discloses a formula and a preparation process of a starch grafted acrylic acid super absorbent resin, which comprises the following raw materials in parts by weight: 25-30 parts of waste acrylic acid, 50-60 parts of starch, 15-20 parts of potassium hydroxide solution, 30-40 parts of absolute ethyl alcohol, 10-15 parts of potassium persulfate and 5-10 parts of cross-linking agent, adding a proper amount of distilled water into soluble starch, stirring to form a suspension, stirring for gelatinization and cooling, adding a proper amount of potassium persulfate, and uniformly stirring at constant temperature; then neutralizing acrylic acid with potassium hydroxide solution, adding N, N' -methylene-bisacrylamide when the neutralized solution is cooled to room temperature, and stirring uniformly; then pouring the neutralization solution into the gelatinized starch, stirring, introducing nitrogen gas until the reaction is complete, and cooling to room temperature for reaction to obtain a graft copolymer; filtering the copolymer, and washing for 2-3 times by using absolute ethyl alcohol; after washing, drying, crushing and sieving, the light yellow crystal super absorbent resin is obtained. CN103041691A discloses a desiccant composition, which comprises 70-80% by weight of calcium chloride and 20-30% by weight of polyacrylamide starch, wherein the polyacrylamide starch is prepared by graft copolymerization of starch and acrylamide under the catalysis of ammonium persulfate and the crosslinking condition of N, N-methylene-bis-acrylamide, and the desiccant composition has the advantage that the hygroscopic property of the polyacrylamide starch can be fully exerted.
CN105693934A discloses a super absorbent resin, the raw materials for its preparation include polymeric monomer, cross-linking agent, initiator, starch phosphate, oxidized cellulose, modified montmorillonite, wherein the polymeric monomer includes acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, maleic anhydride, relative to 100 parts by mass of the polymeric monomer, the cross-linking agent is 0.03-0.10 part, the super absorbent resin has an absorption capacity of at least 1100g/g for deionized water and an absorption capacity of at least 130g/g for physiological saline.
CN2011101411515 discloses a preparation process of hygroscopic resin particles, which comprises the following steps: (1) dissolving NaOH in water to prepare NaOH aqueous solution, and cooling to normal temperature. (2) The aqueous NaOH solution was titrated with an Acrylic Acid (AA) solution under magnetic stirring. (3) Adding Acrylamide (AM) into the mixed solution, continuing stirring until the AM is completely dissolved, and then placing the mixture in an oven at 70 ℃ for heating for 1 h. (4) The temperature is kept at 70 ℃, and quantitative cross-linking agent (N, N' -methylene-bisacrylamide) and initiator (potassium persulfate) are added into the solution for polymerization and cross-linking reaction for 5 hours. (5) And drying the product at 100 ℃, crushing the dried product, and sieving the dried product to obtain resin particles with the particle size of 0.20-0.56 mm.
In the preparation of either a water-absorbent resin or a hygroscopic material, since a chemical reaction is carried out, it is necessary to first enlarge the contact area or contact point between the starch and the reagent, and since the starch is not very soluble or even insoluble in water due to the structural limitation of the starch itself, the starch must be gelatinized first and then reacted with another reagent. During graft copolymerization, an initiator is required to be added so as to induce the generation of free radicals in starch, most importantly, a free radical mechanism is adopted, and the reaction is subjected to three stages of chain initiation, chain growth and chain termination, wherein the chain initiation method comprises thermal initiation, radioactive ray initiation, ultraviolet initiation and the like, the chemical initiation method comprises the addition of the initiator, the initiator is mainly initiated by cerium ions, most commonly cerium ammonium sulfate and manganese ion initiation systems, the graft copolymerization efficiency of the initiated starch and acrylonitrile is high, the common ferrous sulfate-hydrogen peroxide initiation system in an oxidation-reduction initiation system can also generate free radicals by azodiisobutyronitrile, but as the initiator is an oil-soluble substance, the initiator is not used in the graft copolymerization of the starch, peroxides are another type of initiation substance commonly used, and commonly used substances comprise ammonium persulfate, potassium persulfate and the like.
Many publications and patent documents are available for the production of super absorbent resins, and it is found that many methods are available for the production of super absorbent resins or hygroscopic resins, and the purpose of the production is basically to increase the water absorption capacity of the resins and to improve the salt resistance of the resins. The water-absorbent resin generally has a certain moisture absorption capacity, but the concepts of moisture absorption and water absorption are different, for example, the water-absorbent resin refers to a resin obtained by directly immersing the resin in water or directly contacting water with a super-absorbent resin to study the absorption or retention capacity of the resin to liquid water; moisture absorption refers to the ability of a material to absorb water vapor in air or other gas mixtures that do not chemically react with resins, and a quantitative measure of moisture absorption is the moisture absorption rate, which is the ratio of the difference between the weight of the material or material after moisture absorption and the weight of the material or material before moisture absorption to the weight of the material or material before moisture absorption under certain conditions.
The starch is the second largest carbohydrate with the yield second to cellulose in nature, is low in price and renewable, and has the advantage of being unique in the preparation of the moisture-absorbing material by taking the starch as the raw material, but the existing method for preparing the moisture-absorbing material adopts the method for preparing the water-absorbing resin, so that the preparation steps are complicated, the partially neutralized acrylic acid and the cross-linking agent are used, and the moisture absorption rate of the obtained resin is low.
Disclosure of Invention
The invention solves the problem by the following technical scheme:
a preparation method of starch-based hygroscopic resin comprises the following steps:
step one, adding water which is 3-30 times of the weight of starch into 1 part of starch, stirring and wetting, gelatinizing for 10-90 minutes at 40-90 ℃,
step two, adding 5-50 times of the weight of starch and 10-80% of sodium acrylate solution in percentage by weight into the mixture obtained in the step one, uniformly stirring,
and step three, adding an initiator which is 0.02-0.6 time of the weight of the starch into the mixture obtained in the step two in the form of an aqueous solution, reacting for 60-180 minutes at 50-80 ℃, drying, crushing and screening to obtain the hygroscopic resin.
The starch in the first step includes, but is not limited to, corn, sweet potato, cassava, and konjac starch.
And the weight percentage concentration of the sodium acrylate solution in the second step is 15-55%.
The concentration of the initiator aqueous solution in the third step is 0.1-30%, and the preferable weight percentage concentration is 1-15%.
The advantages are that: compared with the prior art, the preparation method for preparing the hygroscopic resin disclosed by the invention is simple, the production flow is simplified, the raw material consumption is reduced, and the production cost is reduced.
Detailed Description
In order to further understand the present invention, the following examples are provided to illustrate the present invention in more detail.
The drying is carried out by drying the obtained resin mixture in a vacuum drying oven at 70 deg.C, pulverizing the dried sample with a high-speed universal pulverizer of trades GmbH, sieving with a sample sieve, and measuring hygroscopicity with resin with particle size less than 1 mm.
Moisture absorption test method: putting a sample screened by a certain mass into a weighing bottle, uniformly spreading the sample in the weighing bottle, numbering and constant-weight the sample respectively, then putting the sample into the upper space of a sealed container filled with a saturated sodium nitrite solution and a saturated potassium chloride solution respectively, taking out the sample after a certain time, weighing the sample and recording experimental data, wherein the relative humidity of the saturated sodium nitrite solution and the saturated potassium chloride solution is 65 percent and 84 percent respectively at the temperature of 25 ℃, and the moisture absorption rate R is as follows:
wherein a represents the weight of the resin before moisture absorption, and b represents the weight of the resin after moisture absorption for a certain time at a certain relative humidity.
The sampling quality of the samples in the examples and the comparative examples is as close as possible to eliminate the influence caused by the difference of moisture absorption conditions.
The sodium acrylate solution is obtained by neutralizing acrylic acid and sodium hydroxide, and the preparation method comprises slowly dripping liquid acrylic acid into sodium hydroxide solution with certain concentration, controlling the temperature to be lower than 10 ℃ in the neutralization process, and calculating the weight of acrylic acid required by different neutralization degrees according to the weight of sodium hydroxide to control the neutralization degree of acrylic acid. The degree of neutralization is defined as the weight of acrylic acid that is completely neutralized with sodium hydroxide as a percentage of the total weight of acrylic acid. The degree of neutralization of the sodium acrylate solution was 100%.
All experiments were performed in a small beaker, sealed with a preservative film during the experiment, and magnetically stirred. An acrylic acid solution having a degree of neutralization of less than 100%, that is, a mixed solution of acrylic acid and sodium acrylate, is obtained by adding liquid acrylic acid dropwise to a 25% sodium hydroxide solution.
Example 1, 6.6 g of distilled water was added to 1.0g of corn starch, the mixture was stirred and moistened, and gelatinized for 15 minutes at 80 ℃ in a thermal magnetic stirrer, 22.2 g of a sodium acrylate solution having a concentration of 40.5% by weight and 4.0 g of a 3% potassium persulfate solution were added to the gelatinized mixture, and the mixture was reacted at 70 ℃ for 90 minutes, vacuum-dried at 70 ℃, pulverized and sieved, and the results of moisture absorption measurements of 65% and 84% relative humidity were given in tables one and two.
Example 2, 6.6 g of distilled water was added to 1.0g of corn starch, the mixture was stirred and moistened, gelatinized for 15 minutes at 80 ℃ in a thermal magnetic stirrer, 44.4 g of a sodium acrylate solution having a concentration of 40.5% by weight and 4.0 g of a potassium persulfate solution having a concentration of 3% by weight were added, the reaction was carried out for 90 minutes at 70 ℃, the reaction mixture was vacuum-dried, pulverized and sieved at 70 ℃, and the results of moisture absorption measurements of 65% and 84% relative humidity were given in tables one and two.
TABLE I moisture absorption Rate measurement results at 65% relative humidity
TABLE II moisture absorption rate measurement results at 84% relative humidity
Example 3, 20.0 g of distilled water was added to a beaker containing 3.0 g of corn starch, the mixture was stirred and moistened, and gelatinized for 15 minutes at 80 ℃ in a heat-collecting magnetic stirrer, 96.7 g of a sodium acrylate solution having a concentration of 40.5% by weight and 4.0 g of a 3.0% potassium persulfate solution were added, the mixture was reacted at 70 ℃ for 90 minutes, vacuum-dried at 70 ℃, and then pulverized and sieved, and the results of moisture absorption measurement at relative humidities of 65% and 84% are shown in table three and table four.
Example 4, 20.0 g of distilled water was added to a beaker containing 3.0 g of corn starch, the mixture was stirred and moistened, and gelatinized for 30 minutes at 80 ℃ in a heat-collecting magnetic stirrer, 96.7 g of a sodium acrylate solution having a concentration of 40.5% by weight and 4.0 g of a 3% potassium persulfate solution were added, the mixture was reacted for 90 minutes at 70 ℃, vacuum-dried at 70 ℃, and then pulverized and sieved, and the results of moisture absorption measurement at relative humidities of 65% and 84% are shown in table three and table four.
TABLE III determination of moisture absorption at 65% relative humidity
TABLE IV moisture absorption rate at 84% relative humidity
Comparative example 1, 75.0 g of distilled water was added to 3.0 g of corn starch, the mixture was stirred and wetted, the mixture was sealed with a wrap film, gelatinized at 80 ℃ for 15 minutes, 15.6 g of an acrylic acid solution having a neutralization degree of 25%, 4.0 g of a 3.0% potassium persulfate solution, and 3.0 g of an N, N-methylenebisacrylamide solution having a crosslinking agent concentration of 1% by weight were added, the mixture was reacted at 70 ℃ for 90 minutes, and the moisture absorbances when the relative humidities were 65% and 84% were respectively shown in Table five and Table six.
Comparative example 2, 75.0 g of distilled water was added to 3.0 g of corn starch, the mixture was stirred and wetted, the mixture was sealed with a wrap film, gelatinized at 80 ℃ for 15 minutes, 21.1 g of an acrylic acid solution having a neutralization degree of 50%, 4.0 g of a 3.0% potassium persulfate solution, and 3.0 g of an N, N-methylenebisacrylamide solution having a crosslinking agent concentration of 1% by weight were added, the mixture was reacted at 70 ℃ for 90 minutes, and the moisture absorbances when the relative humidities were 65% and 84% were respectively determined by drying, pulverizing, and sieving are shown in Table five and Table six.
Comparative example 3, 75.0 g of distilled water was added to 3.0 g of corn starch, the mixture was stirred and wetted, the mixture was sealed with a wrap film, gelatinized at 80 ℃ for 15 minutes, 26.7 g of an acrylic acid solution having a neutralization degree of 75%, 4.0 g of a 3.0% potassium persulfate solution, and 3.0 g of an N, N-methylenebisacrylamide solution having a crosslinking agent concentration of 1% by weight were added, the mixture was reacted at 70 ℃ for 90 minutes, and the moisture absorbances when the relative humidities were 65% and 84% were respectively shown in Table five and Table six.
Example 4, 75.0 g of distilled water was added to 3.0 g of corn starch, the mixture was stirred and moistened, and gelatinized at 80 ℃ for 15 minutes, 32.2 g of a sodium acrylate solution (acrylic acid having a degree of neutralization of 100%) and 4.0 g of a 3.0% potassium persulfate solution were added to react at 70 ℃ for 90 minutes, and the moisture absorption rates at relative humidities of 65% and 84% were shown in table five and table six, respectively, by drying, pulverizing and sieving.
The data for moisture absorption in all tables are by weight.
TABLE V influence of acrylic acid neutralization degree on resin moisture absorption rate at 65% relative humidity
TABLE VI Effect of acrylic acid neutralization degree at 84% relative humidity on resin moisture absorption
Example 5, 6.6 g of water was added to 1.0g of corn starch, the mixture was stirred and wetted, and gelatinized at 80 ℃ for 30 minutes, 19.0 g of a 40.5% sodium acrylate solution by weight and 1.6 g of a 3% potassium persulfate solution were added, and the mixture was reacted at 80 ℃ for 60 minutes without adding a crosslinking agent, dried, pulverized and sieved, and the moisture absorption rate at a relative humidity of 65% was as shown in Table seven.
Comparative example 4, comparative example 5, and comparative example 6 were the same as in example 5, and the crosslinking agents were each 1% by weight of an aqueous solution of N, N' -methylenebisacrylamide, except that the weight of the aqueous crosslinking agent solution was different. The moisture absorption test data of example 5, comparative example 4, comparative example 5 and comparative example 6 are test data of absorbing moisture for 120 hours at a relative humidity of 65%.
TABLE VII moisture absorption determination test results at 65% relative humidity
It has also been found in experiments that when an inorganic salt which does not bind to an acrylic acid group is added to a resin, the moisture absorption rate of the resin can be increased, but after the moisture absorption rate exceeds a certain range, liquid water always appears around the moisture-absorbing resin.
Claims (5)
1. A preparation method of starch-based hygroscopic resin is characterized by comprising the following steps:
step one, adding water which is 3-30 times of the weight of starch into 1 part of starch, stirring and wetting, gelatinizing for 10-90 minutes at 40-90 ℃,
step two, adding 5-50 times of the weight of starch and 10-80% of sodium acrylate solution in percentage by weight into the mixture obtained in the step one, uniformly stirring,
and step three, adding an initiator which is 0.02-0.6 time of the weight of the starch into the mixture obtained in the step two in the form of an aqueous solution, reacting for 60-180 minutes at 50-80 ℃, drying, crushing and screening to obtain the hygroscopic resin.
2. The method for preparing a starch-based hygroscopic resin as claimed in claim 1, wherein the starch is selected from the group consisting of corn starch, sweet potato starch, tapioca starch, and konjac starch.
3. The method of claim 1, wherein the concentration of the sodium acrylate solution is 15-55% by weight.
4. The method for preparing starch-based hygroscopic resin as claimed in claim 1, wherein the concentration of the aqueous solution of the initiator is 0.1-30%.
5. The method of claim 4, wherein the concentration of the aqueous solution of the initiator is 1-15% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918361.2A CN108976344B (en) | 2018-08-13 | 2018-08-13 | Preparation method of starch-based hygroscopic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918361.2A CN108976344B (en) | 2018-08-13 | 2018-08-13 | Preparation method of starch-based hygroscopic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108976344A CN108976344A (en) | 2018-12-11 |
| CN108976344B true CN108976344B (en) | 2021-07-09 |
Family
ID=64552935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810918361.2A Active CN108976344B (en) | 2018-08-13 | 2018-08-13 | Preparation method of starch-based hygroscopic resin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108976344B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737185B (en) * | 2021-07-26 | 2024-04-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Gas-phase rust-proof humidity control agent and preparation method and application thereof |
| CN115197369A (en) * | 2022-08-24 | 2022-10-18 | 上海昶法新材料有限公司 | Preparation method of graft copolymerization cationic starch |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2901480B2 (en) * | 1994-02-17 | 1999-06-07 | 株式会社日本触媒 | Water-absorbing resin and method for producing the same |
| CN102363641A (en) * | 2011-10-09 | 2012-02-29 | 常熟市威腾进出口有限公司 | Preparation method of starch maize modified sodium polyacrylate composite material |
| CN103601850A (en) * | 2013-10-21 | 2014-02-26 | 青岛三力本诺化学工业有限公司 | Preparation method of super absorbent resin |
-
2018
- 2018-08-13 CN CN201810918361.2A patent/CN108976344B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 淀粉接枝丙烯酸钠聚合物的水溶液合成;曹文仲等;《有色金属》;20101130;第62卷(第4期);第42-44页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108976344A (en) | 2018-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Olad et al. | Water retention and slow release studies of a salep-based hydrogel nanocomposite reinforced with montmorillonite clay | |
| Ismail et al. | Starch-based hydrogels: present status and applications | |
| CN100340584C (en) | Preparation method of high-intensity water absorbent material | |
| Gao et al. | Preparation and properties of novel eco-friendly superabsorbent composites based on raw wheat bran and clays | |
| Lu et al. | Synthesis of superabsorbent starch‐graft‐poly (potassium acrylate‐co‐acrylamide) and its properties | |
| Sun et al. | Controlled pesticide release from porous composite hydrogels based on lignin and polyacrylic acid | |
| CA1075233A (en) | Highly absorbent modified polysaccharides | |
| Zhang et al. | Preparation, swelling behaviors, and slow-release properties of a poly (acrylic acid-co-acrylamide)/sodium humate superabsorbent composite | |
| Mo et al. | Synthesis of poly (acrylic acid)/sodium humate superabsorbent composite for agricultural use | |
| EP2838939B1 (en) | Compounded surface treated carboxyalkylated starch polyacrylate composites | |
| Sutradhar et al. | The synthesis of superabsorbent polymers from a carboxymethylcellulose/acrylic acid blend using gamma radiation and its application in agriculture | |
| BRPI9900855B1 (en) | water absorbing agent prepared from an internally crosslinked water absorbing resin and absorbent matter comprising said agent | |
| CN104446913B (en) | A kind of Sargassum graft type fertilizer and preparation method thereof | |
| AU3807000A (en) | Powdery, cross-linked absorbent polymers, method for the production thereof and their use | |
| CN108976344B (en) | Preparation method of starch-based hygroscopic resin | |
| Zhang et al. | Structural and functional characterization of rice starch-based superabsorbent polymer materials | |
| CN103059327B (en) | Preparation method for resin with high absorptivity | |
| CN104448660B (en) | Superabsorbent resin as well as preparation method and applications thereof | |
| Kulmatov et al. | Hydrogels Based on Rice Starch, Acrylic-and N, N'-Methylenbi Sacrylamide, Metacrylamides and Their Use in Agriculture. | |
| Kamal et al. | Immobilization of glucose isomerase onto radiation synthesized P (AA-co-AMPS) hydrogel and its application | |
| Dudu et al. | Development of urea uptake and release studies using N, N-dimethylacrylamide/maleic acid/citric acid based macrogel | |
| Kundakci et al. | A new composite sorbent for water and dye uptake: Highly swollen acrylamide/2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid/clay hydrogels crosslinked by 1, 4‐butanediol dimethacrylate | |
| CN100412100C (en) | Seaweed type water-absorbing-retaining material, and its preparing method | |
| Erizal et al. | Radiation synthesis of superabsorbent poly (acrylamide-co-acrylic acid)-sodium alginate hydrogels | |
| TWI449732B (en) | Production efficiency of superabsorbent polymer |
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 |