CN109337015A - A kind of rice starch water absorbing agent - Google Patents
A kind of rice starch water absorbing agent Download PDFInfo
- Publication number
- CN109337015A CN109337015A CN201811252353.5A CN201811252353A CN109337015A CN 109337015 A CN109337015 A CN 109337015A CN 201811252353 A CN201811252353 A CN 201811252353A CN 109337015 A CN109337015 A CN 109337015A
- Authority
- CN
- China
- Prior art keywords
- rice starch
- absorbing agent
- water absorbing
- rice
- starch
- 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.)
- Pending
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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The present invention provides a kind of rice starch water absorbing agent, is related to food desiccant technical field；It prepares with the following method: being that water is added in 5~10:90~95 in rice starch according to mass ratio, make starch gelatinization, obtain pasty solutions；The NaOH aqueous solution for being 20~30% by mass fraction, is added drop-wise in acrylic acid, obtains acrylates solution；Pasty solutions are added in acrylates solution, after mixing evenly, initiator and crosslinking agent is sequentially added, reacts under agitation；Reaction product is washed with dehydrated alcohol, drying in baking oven is placed in, grinds, obtain rice starch water absorbing agent crude product；The homopolymer and residual starch in rice starch water absorbing agent crude product are removed, rice starch water absorbing agent is obtained.The present invention utilizes rice starch isolated in processing broken rice, rice starch is reacted with acrylates, prepared rice starch water absorbing agent has the characteristics that biodegradable, renewable, water imbibition is strong, nontoxic, inexpensive and good economic results in society.
Description
Technical field
The present invention relates to food desiccant technical fields, and in particular to a kind of rice starch water absorbing agent.
Background technique
Super absorbent resin is a kind of novel high polymer material with super-strong moisture absorbing water holding capacity, with quick lime, activity
The conventional absorbents material such as charcoal, silica gel is compared, it has, and water absorbing capacity is strong, water holding capacity is strong, renewable is strong, safety coefficient is high
The advantages that.In agriculture field, super absorbent resin can be used to improve the moisture holding capacity of soil, it might even be possible to reduce certain crops
In cadmium concentration；In medicine and hygiene fields, it can be used for operation pad, napkin paper, female sanitary towel and medical dressing；It is building
Field is built, it can be used for humid control, anti-condensation etc..Super absorbent resin is classified according to raw material, can be divided into three kinds: starch base
Water absorbing agent, cellulose base water absorbing agent, synthesis polymer water-absorbent.Currently, most of synthesis polymer water-absorbents, such as polypropylene
Acid esters, polymethacrylates and polyacrylamide, although they have excellent water absorbing properties and mechanical performance, due to it
It is not biodegradable and may have a negative impact to the health of consumer, therefore people have to concentrate on research direction
The super absorbent resin of natural substrates.Starch is resourceful in nature, it is at low cost, nontoxic, renewable and can biology drop
Solution, the water absorbing properties of starch-base high water-absorption resin can't be satisfactory at present.
Summary of the invention
The purpose of the present invention is to provide a kind of rice starch water absorbing agents, utilize rice isolated in processing broken rice
Starch reacts rice starch with acrylates, prepared rice starch water absorbing agent, have it is biodegradable, can be again
Raw, the features such as water imbibition is strong, nontoxic, inexpensive and good economic results in society.
The purpose of the present invention adopts the following technical scheme that realization:
A kind of rice starch water absorbing agent, prepares with the following method:
(1) it is that water is added in 5~10:90~95 in rice starch according to mass ratio, makes starch gelatinization, obtain
Pasty solutions；
(2) the NaOH aqueous solution for being 20~30% by mass fraction, is added drop-wise in acrylic acid, obtains propylene
Acid salt solution；
(3) pasty solutions are added in acrylates solution, after mixing evenly, sequentially add initiator and friendship
Join agent, reacts under agitation；
(4) reaction product is washed with dehydrated alcohol, is placed in drying in baking oven, grinds, obtain rice
Starch water absorbing agent crude product；
(5) homopolymer and residual starch in rice starch water absorbing agent crude product are removed, rice starch water absorbing agent is obtained.
In preferred technical solution, the mass ratio of rice starch and acrylic acid is 1:2-1:10, the third of acrylates solution
Olefin(e) acid degree of neutralization is 75-85%.
In the present invention, in step (3) reaction temperature be 60-70 DEG C, the initiator be sodium peroxydisulfate, crosslinking agent N,
N- methylene-bisacrylamide, the additional amount of initiator are the 2.5%-3.0% of rice starch quality, and the additional amount of crosslinking agent is
The 0.5%-1.0% of rice starch quality.
In the present invention, the rice starch is by obtaining after the protein and lipid material in removal rice flour.
In the present invention, the protein in rice flour is removed with the following method: by rice flour in the water logging that pH is 9.5-10.5
In bubble, centrifugation takes precipitating to dry, obtains coarse rice starch；The coarse rice starch is hydrolyzed using alkali protease, is hydrolyzed
It is centrifuged after reaction, takes precipitating, be washed with water, be then dispersed in water, adjust pH to 6.5-7.5, centrifuging and taking precipitating is used in combination
Deionized water washing.
In the present invention, the method for removing lipid material in rice flour is as follows: being impregnated using the mixed solvent of methanol and ether
Rice flour after removing isolating protein, centrifuging and taking precipitating drying, obtains rice starch.
In the present invention, the method for removing homopolymer is as follows: rice starch water absorbing agent crude product is placed in Soxhlet extractor,
Acetone, which is added, uses soxhlet extraction methods extracting to remove the homopolymer in product.
In the present invention, the residual starch in rice starch water absorbing agent crude product is removed with the following method: will remove homopolymerization
Removal residual starch is hydrolyzed using the hydrochloric acid of 0.8-2mol/L in rice starch water absorbing agent crude product after object, then filters, takes
It is 6.8-7.2 that filter residue, which is washed with water to pH, dry, obtains rice starch water absorbing agent.
Applicant has been surprisingly found that the water absorbing agent prepared using rice starch as raw material, have it is renewable, water imbibition is strong, it is nontoxic,
The features such as environmentally friendly and good in economic efficiency.Super absorbent resin is prepared by raw material of rice starch, is had the advantage that
(1) partial size of the rice starch in all starch products is minimum, and granularity is even at 3-8 μm, and surface area is big, adsorption capacity
By force.(2) starch isolation and recycling are carried out to cracking rice for processing generation, there is very important economics meaning.
Detailed description of the invention
The FTIR spectrum figure of Fig. 1 rice starch and rice starch water absorbing agent 1.
The sucting wet curve of Fig. 2 rice starch water absorbing agent 2 and cornstarch water absorbing agent 2.
The desorption curve of Fig. 3 rice starch water absorbing agent 2 and cornstarch water absorbing agent 2.
Specific embodiment
Embodiment 1 prepares rice starch
Rice starch is prepared to include the following steps:
(1) rice starch is obtained
The broken polished rice that processing generates is smashed it through into 80 meshes and obtains rice flour, 4 mass parts are added in 1 mass parts rice flour and go
Ionized water stirs evenly, and adjusts pH to 10.0 with NaOH solution, is centrifuged 20min (9000r/min) after impregnating 3 hours, takes precipitating
35 DEG C of baking oven drying are placed in get coarse rice starch.
(2) rice starch is purified
It removes isolating protein: adding water in coarse rice starch, be made into the lotion that mass percentage concentration is 35%, adjust pH=
10, controlled at 55 DEG C, be added rice starch quality 0.5% alkali protease (Beijing Suo Laibao Science and Technology Ltd,
B8361), pH=10 is maintained in reaction process, stirs 5h.It is centrifuged 20min (9000r/min) after reaction, precipitating is taken, spends
Ion water washing precipitates 2 times.And then disperse sediment in deionized water, pH=7 is adjusted, is centrifuged 20min again
(9000r/min) takes precipitating, is washed with deionized 2 times, the rice starch after obtaining isolating protein.
It removes lipid material: the methanol and second that volume ratio is 1:1 being added in removing the rice starch sample after isolating protein
The mixed liquor of ether is appropriate, keeps rice starch fully dispersed in organic solvent, stands 1h after mixing evenly, be then centrifuged for 20min
(9000r/min) takes precipitating.It is extracted altogether twice according to the method described above using the mixed liquor of methanol and ether, sufficiently removal is big
Lipid component in rice starch is placed in drying in baking oven, obtains high-purity rice starch.
Embodiment 2 prepares rice starch water absorbing agent
1. preparing rice starch water absorbing agent 1
10g high-purity rice starch (in embodiment 1 prepared by method) is taken, the rice starch cream that configuration quality score is 10%
Liquid is gelatinized 20min under the conditions of 85 DEG C, cooling, obtains pasty solutions.Claim 20g acrylic acid, the NaOH for being 25% by mass fraction
Aqueous solution is slowly dropped in acrylic acid, so that the degree of neutralization of acrylic acid is reached 80%, is cooled to room temperature, it is molten to obtain acrylates
Liquid.60 DEG C of pasty solutions are added in acrylates solution, after mixing evenly, sequentially add rice starch quality 2.7%
Crosslinking agent N, the N- methylene-bisacrylamide of initiator sodium peroxydisulfate and rice starch quality 0.7%, stirring is until form solidifying
Gelatinous water absorbing agent, control reaction temperature is 60 DEG C in reaction process.Reaction product is washed for several times with dehydrated alcohol to remove
Unreacted acrylic acid, crosslinking agent and initiator, then it is placed in drying in 80-100 DEG C of baking oven, it then grinds, is absorbed water
Agent crude product.Water absorbing agent crude product is removed into homopolymer, isolates grafted branches, obtains rice starch water absorbing agent 1.
The method for removing homopolymer: Soxhlet extractor is placed in 70-80 DEG C of water-bath, weighs a certain amount of dry to constant weight
Water absorbing agent crude product is placed in the Soxhlet extractor, and 100mL acetone is then added and uses soxhlet extraction methods extracting 48h to remove product
In homopolymer, then will remove the water absorbing agent crude product after homopolymer and dry in 80-100 DEG C of baking oven to constant weight.
The method for separating grafted branches: the water absorbing agent crude product after removal homopolymer is placed in three-necked bottle, it is dense that 100mL is added
Degree is the hydrochloric acid of 1mol/L, is fully hydrolyzed in 90-98 DEG C of water-bath to remove starch backbone.It is drawn on a small quantity with dropper containing solid
The solution of body particle is detected whether to become blue with iodine indicator solution.If constant indigo plant, hydrolysis is proved completely, whereas to continuing to hydrolyze, directly
It is non-discolouring that iodine is met to solution.After hydrolysis, three-necked bottle cooling in ice-water bath is removed, solution is poured into Buchner funnel and is taken out
Filter, and filter cake is washed with water to neutrality, it is subsequently placed in 80-100 DEG C of thermostatic drying chamber and dries to constant weight, obtain rice starch suction
Aqua 1.
Reaction principle is as follows: free radical type graft copolymerization is so that the H on starch molecule is seized and is generated using initiator
Then free radical causes monomeric acrylic again, form Starch with Acrylic Acid free radical, continues to carry out chain growth polymerization with acrylic acid,
Until reaction terminates, starch-graft-acrylic acid copolymer is obtained.But polymerization reaction can be formed on monomer sometimes, be free of
The monomer-polymer of starch, i.e. homopolymer.Reaction product is the mixture of graft polymers and homopolymer.Ideal graft process
Higher grafting efficiency is obtained, homopolymer is made to be reduced to a minimum.
Rice starch and acrylic acid reactive grafting rate calculation formula are as follows:
Measuring the grafting percent of rice starch and graft copolymerization of acrylic under above-mentioned condition is 92.2%.
The FTIR spectrum figure of rice starch water absorbing agent 1 as shown in Figure 1, rice starch in 3380cm-Nearby go out at 1
Relatively strong and wider stretching vibration absworption peak is showed, this is because being formed caused by hydrogen bond between hydroxyl.Rice starch water absorbing agent 1
Compared with the spectrogram of rice starch, the overall absorption intensity of each characteristic peak is declined, and shows respectively to change in graft copolymerization
It learns and polymerization reaction occurs between key, the intensity of characteristic peak is caused to decline, rather than simple physical mixed.
2. preparing rice starch water absorbing agent 2,3
Rice starch water absorbing agent 2 is prepared using the preparation method of rice starch water absorbing agent 1, Raw Materials Rice is before different
The mass ratio of starch and acrylic acid is 1:5.Rice starch water absorbing agent 3 is prepared using the preparation method of rice starch water absorbing agent 1, no
The mass ratio for being Raw Materials Rice starch and acrylic acid with before is 1:10.The usage amount of initiator sodium peroxydisulfate in preparation method
It is the 2.7% of rice starch quality, the usage amount of crosslinking agent N, N- methylene-bisacrylamide is rice starch quality
0.7%.The FTIR spectrum figure of rice starch water absorbing agent 2,3 is similar to rice starch water absorbing agent 1, the spectrum with rice starch
Figure is compared, and the overall absorption intensity of each characteristic peak is declined, and shows to occur between chemical bond each in graft copolymerization poly-
Reaction is closed, the intensity of characteristic peak is caused to decline, rather than simple physical mixed.
Cornstarch water absorbing agent 1 is prepared using the preparation method of rice starch water absorbing agent 1, the difference is that forming sediment with corn
Powder substitutes rice starch and cornstarch and acrylic acid mass ratio are 1:2, and the usage amount of initiator sodium peroxydisulfate is cornstarch
The 2.7% of quality, the usage amount of crosslinking agent N, N- methylene-bisacrylamide are the 0.7% of cornstarch quality.
Cornstarch water absorbing agent 2 is prepared using the preparation method of cornstarch water absorbing agent 1, the difference is that cornstarch
With the mass ratio 1:5 of acrylic acid.
3. the property of each water absorbing agent
(1) water absorption rate measuring method is as follows:
The dry sample to constant weight of 1.0g is accurately weighed, is impregnated in distilled water for 24 hours, with filtered through gauze, filters off excessive moisture,
Weighing.The water absorption rate of water-absorbing resin is calculated with following formula.
In formula: Q- water absorption rate (g/g)；WdWater absorbing agent dry weight (g)；WsWater absorbing agent weight in wet base (g) after impregnating for 24 hours.
Water absorption rate the results are shown in Table 1.As can be seen from Table 1: rice starch and acrylic acid ratio is prepared by 1:2-1:10
Rice starch water absorbing agent has preferable water absorption rate, and at equal process conditions, and rice starch water absorbing agent forms sediment than corn
Powder water absorbing agent has better water absorption character, and furthermore rice starch water absorbing agent also has good reproducibility.
(2) moisture pick-up properties measuring method is as follows:
The dry sample to constant weight of 3.00g is weighed, the climatic chamber (T=25 DEG C) of relative humidity RH=90% is placed in
In, the mass change of a sample is measured every 1h, to measure its hydroscopicity and calculate average moisture absorption rate, calculation method is as follows:
Hydroscopicity (%)=(moisture absorption weight gain/sample dry weight) × 100% (3)
Average moisture absorption rate (%)=(moisture absorption weight gain/sample dry weight in the unit time) × 100% (4).
Fig. 2 is rice starch water absorbing agent 2 and 2 sucting wet curve of cornstarch water absorbing agent, by Fig. 2 it can be found that in moisture absorption speed
In terms of rate, the rice starch water absorbing agent prepared under same process conditions is better than cornstarch water absorbing agent.Each shallow lake is shown in Fig. 2
120 hours hydroscopicities of powder water absorbing agent, the hydroscopicity significant difference of two kinds of starch water absorbing agents under the conditions of RH=90%.
(3) desorption performance measuring method is as follows: first by the dry sample to constant weight in climatic chamber (relative humidity RH=
90%, T=25 DEG C) in moisture absorption for 24 hours, then place it in condition be relative humidity RH=10%, T=30 DEG C of climatic chamber
In desorbed, measure its moisture absorption loss of weight and calculate its desorption efficiency, calculation method is as follows:
Desorption efficiency (%)=(moisture absorption loss of weight/drying to constant weight sample quality) × 100% (5)
The quality after quality-sample desorption t hours after moisture absorption loss of weight=sample moisture absorption for 24 hours
Fig. 3 is the desorption curve of rice starch water absorbing agent 2 and cornstarch water absorbing agent 2, desorption curve key reaction water suction
The water retention characteristic of agent, in terms of retentiveness not there is no significant difference in rice starch water absorbing agent 2 and cornstarch water absorbing agent 2.
(4) reproducibility measures
The dry sample to constant weight of 1.0g is accurately weighed, is impregnated in distilled water for 24 hours, with filtered through gauze, filters off excessive moisture,
Weighing calculates water absorption rate.It is dried at 110 DEG C, then is placed in distilled water and impregnates for 24 hours, measure water absorption rate again, investigate water absorbing agent
Reproducibility.Water absorption rate calculation method is the same as formula 1.It the results are shown in Table 1.
1 rice starch water absorbing agent of table and cornstarch water absorbing agent water absorption rate and regenerative nature
| Water absorption rate (g/g) | Reproducibility (g/g) | |
| Rice starch water absorbing agent 1 | 151.2 | 134.8 |
| Rice starch water absorbing agent 2 | 320.5 | 318.2 |
| Rice starch water absorbing agent 3 | 380.2 | 375.7 |
| Cornstarch water absorbing agent 1 | 64.3 | 56.6 |
| Cornstarch water absorbing agent 2 | 230.5 | 228.2 |
Currently, the preparation of starch Super Absorbent Resin is mainly using cornstarch as raw material, applicant is found surprisingly that,
Under same process conditions, rice starch water absorbing agent has better water absorption character than cornstarch water absorbing agent.
Claims (8)
1. a kind of rice starch water absorbing agent, it is characterised in that prepare with the following method:
(1) it is that water is added in 5~10:90~95 in rice starch according to mass ratio, makes starch gelatinization, obtain pasty solutions；
(2) the NaOH aqueous solution for being 20~30% by mass fraction, is added drop-wise in acrylic acid, obtains acrylates solution；
(3) pasty solutions are added in acrylates solution, after mixing evenly, sequentially add initiator and crosslinking agent, is stirring
Under the conditions of react；
(4) reaction product is washed with dehydrated alcohol, is placed in drying in baking oven, grinds, it is thick to obtain rice starch water absorbing agent
Product；
(5) homopolymer and residual starch in rice starch water absorbing agent crude product are removed, rice starch water absorbing agent is obtained.
2. rice starch water absorbing agent according to claim 1, it is characterised in that the mass ratio of rice starch and acrylic acid is 1:
2-1:10, the acrylic acid degree of neutralization of acrylates solution are 75-85%.
3. rice starch water absorbing agent according to claim 1 or claim 2, it is characterised in that reaction temperature is 60-70 in step (3)
DEG C, the initiator is sodium peroxydisulfate, and crosslinking agent N, N- methylene-bisacrylamide, the additional amount of initiator is rice shallow lake
The 2.5%-3.0% of silty amount, the additional amount of crosslinking agent are the 0.5%-1.0% of rice starch quality.
4. rice starch water absorbing agent according to claim 3, it is characterised in that the rice starch is by removal rice flour
Protein and lipid material after obtain.
5. rice starch water absorbing agent according to claim 4, it is characterised in that remove the albumen in rice flour with the following method
Matter: by rice flour in the water that pH is 9.5-10.5 impregnates, centrifugation takes precipitating to dry, obtains coarse rice starch；The coarse rice is formed sediment
Powder is hydrolyzed using alkali protease, is centrifuged after hydrolysis, is taken precipitating, is washed with water, is then dispersed in water, is adjusted
PH to 6.5-7.5, centrifuging and taking precipitating are saved, and is washed with deionized.
6. rice starch water absorbing agent according to claim 5, it is characterised in that the method for lipid material is as follows in removal rice flour:
Rice flour after removing isolating protein is impregnated using the mixed solvent of methanol and ether, centrifuging and taking precipitating drying obtains rice starch.
7. rice starch water absorbing agent according to claim 6, it is characterised in that the method for removing homopolymer is as follows: rice is formed sediment
Powder water absorbing agent crude product is placed in Soxhlet extractor, and acetone is added and uses soxhlet extraction methods extracting to remove the homopolymer in product.
8. rice starch water absorbing agent according to claim 7, it is characterised in that remove rice starch water suction with the following method
Residual starch in agent crude product: the rice starch water absorbing agent crude product after removal homopolymer is carried out using the hydrochloric acid of 0.8-2mol/L
Hydrolysis removal residual starch, then filters, and taking filter residue to be washed with water to pH is 6.8-7.2, dry, obtains rice starch water absorbing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252353.5A CN109337015A (en) | 2018-10-25 | 2018-10-25 | A kind of rice starch water absorbing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811252353.5A CN109337015A (en) | 2018-10-25 | 2018-10-25 | A kind of rice starch water absorbing agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109337015A true CN109337015A (en) | 2019-02-15 |
Family
ID=65312240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811252353.5A Pending CN109337015A (en) | 2018-10-25 | 2018-10-25 | A kind of rice starch water absorbing agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109337015A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110577433A (en) * | 2019-06-28 | 2019-12-17 | 同济大学 | Preparation method of kitchen waste-based composite gel slow-release fertilizer |
| CN113004903A (en) * | 2021-03-15 | 2021-06-22 | 湖南华田盛德生物科技有限公司 | Organic fertilizer for repairing heavy metal contaminated soil and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000143720A (en) * | 1998-11-11 | 2000-05-26 | Sanyo Chem Ind Ltd | Production of water absorptive resin |
| CN104610501A (en) * | 2015-01-22 | 2015-05-13 | 燕山大学 | High-water-absorbent resin and preparation method thereof |
| CN106188404A (en) * | 2016-07-24 | 2016-12-07 | 泉州海岸线新材料科技有限公司 | The formula of a kind of Technologies of Water-absorbing Resin: Corn Starch Grafting and preparation technology |
| CN106366248A (en) * | 2016-08-26 | 2017-02-01 | 胡级轮 | Starch-based absorbent resin and preparation method therefor |
-
2018
- 2018-10-25 CN CN201811252353.5A patent/CN109337015A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000143720A (en) * | 1998-11-11 | 2000-05-26 | Sanyo Chem Ind Ltd | Production of water absorptive resin |
| CN104610501A (en) * | 2015-01-22 | 2015-05-13 | 燕山大学 | High-water-absorbent resin and preparation method thereof |
| CN106188404A (en) * | 2016-07-24 | 2016-12-07 | 泉州海岸线新材料科技有限公司 | The formula of a kind of Technologies of Water-absorbing Resin: Corn Starch Grafting and preparation technology |
| CN106366248A (en) * | 2016-08-26 | 2017-02-01 | 胡级轮 | Starch-based absorbent resin and preparation method therefor |
Non-Patent Citations (2)
| Title |
|---|
| 张干伟等: "淀粉来源及预处理方式对淀粉接枝共聚反应的影响", 《无锡轻工大学学报》 * |
| 李兆丰等: "稻米淀粉的研究进展", 《食品科学》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110577433A (en) * | 2019-06-28 | 2019-12-17 | 同济大学 | Preparation method of kitchen waste-based composite gel slow-release fertilizer |
| CN113004903A (en) * | 2021-03-15 | 2021-06-22 | 湖南华田盛德生物科技有限公司 | Organic fertilizer for repairing heavy metal contaminated soil and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1075233A (en) | Highly absorbent modified polysaccharides | |
| JPS5856526B2 (en) | Manufacturing method for water-absorbing starch products | |
| CN108976440B (en) | Method for preparing hydrogel from bagasse hemicellulose | |
| CA2765226A1 (en) | Superabsorbent cellulosic fiber and method of making same | |
| CN109337015A (en) | A kind of rice starch water absorbing agent | |
| US5258448A (en) | Absorbent polymers, manufacturing process and their use in particular for sanitary articles | |
| CN108003391A (en) | A kind of full polysaccharide derivates base superabsorbent hydrogel and its preparation method and application | |
| CN103724555A (en) | Preparation method for thermoplastic elastomer | |
| CN107722163A (en) | The water-absorbing resins and its application of acrylic water-absorbent resin and low soluble component | |
| CN109135757A (en) | A kind of preparation method of compound water retaining agent | |
| CN106496382B (en) | A kind of super absorbent resin and its preparation method and application | |
| CN103755860A (en) | Preparation method of acrylic acid copolymer hydrogel | |
| CN85103771A (en) | The preparation of starch based super efficient water absorbent | |
| JP2000507311A (en) | Vegetable fiber | |
| US5219971A (en) | Process for the preparation of fine-particle, water-swellable polysaccharide graft copolymers | |
| CN112679664B (en) | Seaweed biological water-retaining agent and preparation method thereof | |
| US4959061A (en) | Hydrophilic polymer based on acrylic acid and alkali metal acrylate, its method of preparation and its application as an absorbent, in particular of a physiological solution | |
| CN110477403A (en) | A method of citrus fruit fibres are prepared using citrus peels | |
| CN107400184B (en) | A kind of preparation method of bagasse xylan-g-LME/AA/AM tetrabasic graft copolymer | |
| Mondal et al. | Preparation and characterization of carboxymethyl cellulose-g-acrylamide hydrogel | |
| CN111925493B (en) | Synthesis method of porous lignocellulose filler/super absorbent resin composite material | |
| US4221684A (en) | Absorbent polymeric compositions derived from corn flour and starch | |
| FI113375B (en) | A method for making absorbent materials from a lignocellulosic material | |
| CN107141414A (en) | A kind of super absorbent resin and preparation method thereof | |
| JPH04227710A (en) | Manufacture of finely divided, water-swelling polysaccharide graft 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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190215 |