CN102120806B - Method for synthesizing water-absorbing resin composite material by using corn bract in aqueous phase medium in one step - Google Patents
Method for synthesizing water-absorbing resin composite material by using corn bract in aqueous phase medium in one step Download PDFInfo
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Abstract
The invention provides a method for synthesizing a water-absorbing resin composite material by using corn bract in an aqueous phase medium in one step. The corn bract is directly added in the obtained water-absorbing resin composite material in the polymerization process, so that a short flow is realized. High-value utilization of the corn bract is realized; and the defects of an SAP (systems, applications and products) artificial synthesis structure are overcome by the natural structure of the corn bract. The corn bract accounts for 8 to 10 weight percent of the weight of the water-absorbing resin composite material dried product, so raw material cost is reduced. Due to the adoption of the natural permeable gas structure of the corn bract, the increased drying time caused by the prevention of water evaporation inside holes due to the hole closing on the outer surfaces of SPA colloidal particles after the drying of the outer surface is reduced, and energy consumption and cost are reduced. The water-absorbing resin composite material can be applied to oil-water separation of waste cooking oil; a separation effect is improved by a permeable air hole channel of the corn bract; and the percentage of dehydrated water is 42.1 percent when room temperature is 18 DEG C.
Description
Technical field
The present invention relates to the method for made from bracteal leaf of corn one-step synthesis water-absorbing resin matrix material in aqueous media.
Background technology
High hydrophilous resin, or claim super moisture absorbing resin or be commonly called as water-absorbing material that English is Super-absorbentPolymers (its english abbreviation is SAP).
Fine etc. with vinylformic acid, acrylic amide or propylene is that monomer polymerization obtains 1 ton SAP industrial goods, and the monomer whose consumption is usually more than 0.6 ton; The monomer cost accounts for first of the raw materials cost.
In polymerization process, add starch, the multipolymer that obtains can increase the solids content (abbreviation solid content) of product, reduces SAP product ton cost, and industries such as raising physiological hygiene goods are with the competitive power of SAP goods.Add the method that starch improves solid content, reduces product ton cost in the polymerization, this method has strong magnetism for producing SAP enterprise.
Similarly; Add stalk, wilkinite natural products such as (powders of smectite) raising solid content in the polymerization; This nature that promptly utilizes is bestowed cheap material; Can improve simultaneously SAP performance and the synthetic route that reduces product ton cost again, not only SAP manufacturing enterprise had strong magnetism, receive researchist's attention too.
U.S. individual goods companies (Personal Products Company) in U.S.'s application relatively early in polymerization process, add Mierocrystalline cellulose produce the patent of SAP (USP 3,889,678; 1975).Chinese Academy of Sciences process study place China has applied in polymerization process, adding the patent (CN01131335.8 that stalk is produced SAP; Calendar year 2001).This invention is with the straw oven dry, processes stalk powder, hots plate with the mixed base of caustic soda, Ke Xingjia and soda ash and handles the back direct polymerization, and this invention advantage is to pay attention to short flow process; Deficiency shows that not disclosing stalk powder is the stalk that derives from wheat, corn or sugarcane.In fact, contain a large amount of non-fibre compositions in the stalk of corn or sugarcane, compare with wheat or paddy stalk powder after processing powder, these non-fibre compositions are very big to the polyreaction influence.
In polymerization process, add the Chinese patent that stalk is produced SAP, such as the disclosed CN200910116448.9 patent of Chinese Patent Office on September 2nd, 2009, the disclosed CN201010190067.8 patent of disclosed CN200910254618.X patent of Chinese Patent Office on December 31st, 2009 and Chinese Patent Office on June 3rd, 2010.These patent of invention common traits are: Mierocrystalline cellulose from stalk separation, purifying, be dissolved in the homogeneous phase aqueous solution and carry out graft copolymerization with monomer.Obviously, this method that from stalk, proposes Mierocrystalline cellulose increases flow process length.These inventors think: directly stalk powder is used for the short flow process of polymeric, has " the heterogeneous characteristic of structure, promptly biomass are separated existence with the high-molecular gel of polymkeric substance, are difficult to realize all being combined to of High hydrophilous resin in the water medium ".
Made from bracteal leaf of corn (corn bract or maize husk), i.e. exoperidium on the mealie, it directly contacts and protects corn seed.Exoperidium on this mealie, for protecting the procreation of self seed, the design structure that is difficult to realize with manual work that shows fineness aspect many with valve, heat transfer mechanism etc. at ventilative duct, water transmission route.Mierocrystalline cellulose, Si and Al constituent content do not have stalk many in the made from bracteal leaf of corn.
Baking step in the SAP course of processing, closed pore stops the internal moisture evaporation after the SAP micelle outside surface drying, and this has seriously increased tooling cost.And made from bracteal leaf of corn avoids mealie mouldy for inner the shedding of excess moisture of protection corn seed, sets up the exquisite permeable gas structure that is difficult to realize with manual work; In the SAP polymerization process, add made from bracteal leaf of corn, be expected to utilize the permeable gas structure of this bract to reduce the loss that closed pore stops the internal moisture evaporation to be caused after the SAP micelle outside surface drying.Similar design: SAP is used for oily water separation (CN200810050665.8) operation of hogwash fat, is expected to utilize the permeable pore of this bract road to improve separating effect.
Corn has extensive plantation.Yet, for a long time, a large amount of made from bracteal leaf of corn do not have to effectively utilizing.Get into this century, having the investigator to carry out with the made from bracteal leaf of corn is raw material, therefrom extracts flavones (flavonoid), and maximum flavones extracted amount surpasses 1wt% (grain and grease, 2006 the 1st phase P24-26).Also have research to confirm: the liquid of poach made from bracteal leaf of corn, to arteriosclerosis have fine effect (Chinese arteriosclerosis magazine, 2003, the 11st volume, 3 phases, P207-210).
Yet the method that relates to made from bracteal leaf of corn one-step synthesis water-absorbing resin matrix material in aqueous media is not also seen the open and article report of patent.
Summary of the invention
For solve the made from bracteal leaf of corn higher value application not enough with utilize the natural structure of made from bracteal leaf of corn to remedy the not enough problem of SAP synthetic structure, the invention provides the compound method of a kind of made from bracteal leaf of corn one-step synthesis water-absorbing resin matrix material in aqueous media.
Principle of design of the present invention:
1) utilizes in the made from bracteal leaf of corn and be connected with the natural of Mierocrystalline cellulose or xylogen, be implemented in the water-absorbing resin that in aqueous media one-step synthesis contains made from bracteal leaf of corn such as non-cellulose compositions such as flavones, xenthophylls, chlorophyll and starch.
2) utilize the loss that closed pore stops the internal moisture evaporation to be caused after the permeable gas structure minimizing SAP micelle outside surface drying in the made from bracteal leaf of corn, reduce production costs thereby reduce the oven dry energy consumption.
The invention provides the compound method of a kind of made from bracteal leaf of corn one-step synthesis water-absorbing resin matrix material in aqueous media, its step and condition are following:
The 1st step: the aqueous solution of the required chemical of preparation polymerization
The acrylic acid aqueous solution of A component: 50wt%;
The aqueous sodium hydroxide solution of B component: 15wt%;
The NN ' of C component: the 2wt%-methylene-bisacrylamide aqueous solution;
The ammonium persulfate aqueous solution of D component: 2wt%;
The 2nd step: made from bracteal leaf of corn cut out and dry processing
Made from bracteal leaf of corn is cut into width and is no more than 1 centimeter, length and is no more than 10 centimeters rectangular sheets, and oven dry is 24 hours in 60 ℃ of hot blast environment;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media
By the exsiccant made from bracteal leaf of corn: the weight ratio of A component is 5: 60-70, and the exsiccant made from bracteal leaf of corn that obtains step 2 is put in the A component and soaked 24 hours; Then add the B component and neutralize, the exsiccant made from bracteal leaf of corn: the weight ratio of B component is 5: 95-97; Acid-base neutralisation is heat release, adds the C component behind the reaction system cool to room temperature, and the exsiccant made from bracteal leaf of corn: the weight ratio of C component is 5: 14-16; Add the D component subsequently, the exsiccant made from bracteal leaf of corn: the weight ratio of D component is 5: 12-13; Stirred for 5 seconds with 60 rev/mins revolutions, cover liquid level,, synthesize the gel composite of block water-absorbing resin matrix material with 60 ℃ of water bath with thermostatic control heating 1-2 hour with plastic cloth; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.
To the water-absorbing resin composite material test water absorbing properties that synthesizes.
Beneficial effect: the 1) compound method of a kind of made from bracteal leaf of corn provided by the invention one-step synthesis water-absorbing resin matrix material in aqueous media, the water-absorbing resin matrix material that obtains directly add made from bracteal leaf of corn in polymerization process, realize short flow process.Solve the made from bracteal leaf of corn higher value application simultaneously and utilized the natural structure of made from bracteal leaf of corn to remedy the not enough problem of SAP synthetic structure.2) made from bracteal leaf of corn can reach 8wt%-10wt% in the water-absorbing resin matrix material dry product that obtains, and reduces raw materials cost.3) utilize the natural permeable gas structure of made from bracteal leaf of corn, the drying time that closed pore stops the internal moisture evaporation to be caused after the minimizing SAP micelle outside surface drying increases, and reduces energy consumption and cost; Simultaneously, water-absorbing resin matrix material provided by the invention can be used for the oily water separation operation of hogwash fat, and the permeable pore of this bract road improves separating effect, when room temperature is 18 ℃, deviates from the percentage 42.1% of water.This good dehydration and oil-water separation disclose in embodiments of the invention 4 and accompanying drawing 3 to some extent.
Description of drawings
Fig. 1 is that the present invention selects picture in kind after the made from bracteal leaf of corn drying for use.Quoting this picture purpose is convenient understanding and affirmation to a kind of made from bracteal leaf of corn raw material of one-step synthesis water-absorbing resin matrix material in aqueous media.
Fig. 2 is the gel composite of the block water-absorbing resin matrix material of synthetic of the present invention.The subsequent technique of this gel composite is dried for cutting into fragment again.Quoting this picture purpose also is convenient understanding to a kind of made from bracteal leaf of corn building-up process of one-step synthesis water-absorbing resin matrix material in aqueous media.
Curve 1 among Fig. 3 is synthetic of the present invention has just gone out the block water-absorbing resin matrix material of groove from polymerization tank a gel composite, its 1 cubic centimetre of fragment, the resin loss of weight ratio graphic representation of in 60 ℃ of hot-air ovens, drying.
The definition and the formula of resin loss of weight ratio are: in the drying course certain constantly weight (Mt) and the resin of resin get into poor (Mo-Mt) of original weight (Mo) at the beginning of the baking oven and ratio (the weight percent ratio of [Mo-Mt]/Mo) of original weight.
Fig. 4 is that water-absorbing resin matrix material of the present invention and starch-acrylic acid-grafted type SAP absorb the suction salt outlet capacity map of different concns salt solution.
Curve 1 is that water-absorbing resin matrix material of the present invention is inhaled the salt solution power curve among the figure; Curve 2 is that starch-acrylic acid-grafted type SAP inhales the salt solution power curve.Visible by figure, inhale the salt outlet capacity the former apparently higher than the latter.
Embodiment
Embodiment 1:
The 1st step: the aqueous solution of preparing the required A of polymerization, B, C, four kinds of chemical of D: the acrylic acid aqueous solution of A component: 50wt%; The aqueous sodium hydroxide solution of B component: 15wt%; The NN ' of C component: the 2wt%-methylene-bisacrylamide aqueous solution; The ammonium persulfate aqueous solution of D component: 2wt%.
The 2nd step: made from bracteal leaf of corn cut out and dry processing: made from bracteal leaf of corn is cut into width and is no more than 1 centimeter, length and is no more than 10 centimeters rectangular sheets; Oven dry is 24 hours in 60 ℃ of hot blast environment;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media: the dried made from bracteal leaf of corn rectangular sheet of 50 grams is put in the A component of 600 grams and soaked 24 hours; The B component neutralization that adds 950 gram grams again; Acid-base neutralisation is heat release, adds the C component of 140 gram grams behind the reaction system cool to room temperature, adds the D component of 120 grams subsequently; Revolution with 60 rev/mins of revolutions stirred for 5 seconds; Cover liquid level with plastic cloth,, synthesize the gel composite of block water-absorbing resin matrix material with 60 degrees centigrade of water bath with thermostatic control heating 1 hour; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.。
The block water-absorbing resin matrix material of the gel that synthesizes is cut into less than 1 cubic centimetre of fragment, and oven dry is pulverized and the test water absorbing properties then.
The water absorbent rate of water-absorbing resin matrix material is measured and is adopted Ni net method to measure, and the order number of this nickel screen is 200 orders.Get this water-absorbing resin matrix material after 1 gram is dried, pulverized, soaked 24 hours with deionized water, weigh once more with the moisture that can trickle on the 200 order nickel screens filter neat hydrogels, the weight of this hydrogel is 286 grams, and the water absorbent rate of promptly inhaling deionized water is 286 times.Use with quadrat method and measure containing the aqueous solution of 0.9wt% sodium-chlor, i.e. the water absorbent rate of " normal saline solution ", its water absorbent rate is 72 times.Substitute with city tap-water, its water absorbent rate of inhaling city tap-water is 260 times.
Embodiment 2:
Different is with embodiment 1: in the 3rd step,
(1) 50 gram made from bracteal leaf of corn rectangular sheet is put in the A component of 650 grams and soaked 24 hours.
(2) B component add-on is 960 grams.
(3) add-on of C component is 150 gram grams.
(4) add-on of D component is 125 gram grams.
(5) using 60 degrees centigrade of water bath with thermostatic control heated polymerizable times is 2 hours.
Measure the water absorbent rate of water-absorbing resin matrix material with the Ni net method of embodiment 1, the water absorbent rate of inhaling deionized water is 295 times.Inhaling the water absorbent rate of " normal saline solution ", is 75 times.The water absorbent rate of inhaling city tap-water is 261 times.
Embodiment 3:
Different is with embodiment 1: in the 3rd step,
(1), 50 gram made from bracteal leaf of corn rectangular sheets are put into the A component of 700 grams, promptly soaked 24 hours in the acrylic acid aqueous solution of 50wt%.
(2), B component add-on is 960 grams.
(3), the add-on of C component is 160 gram grams.
(4), the add-on of D component is 130 gram grams.
(5), using 60 degrees centigrade of water bath with thermostatic control heated polymerizable times is 1.5 hours.
Measure the water absorbent rate of water-absorbing resin matrix material with the Ni net method of embodiment 1, the water absorbent rate of inhaling deionized water is 280 times.Inhaling the water absorbent rate of " normal saline solution ", is 72 times.The water absorbent rate of inhaling city tap-water is 258 times.
Embodiment 4:
Different is with embodiment 1: in the 3rd step,
(1), 50 gram made from bracteal leaf of corn rectangular sheets are put into the A component of 680 grams, promptly soaked 24 hours in the acrylic acid aqueous solution of 50wt%.
(2), B component add-on is 965 grams.
(3), the add-on of C component is 155 grams.
(4), the add-on of D component is 125 gram grams.
(5), using 60 degrees centigrade of water bath with thermostatic control heated polymerizable times is 1.8 hours.
Measure the water absorbent rate of water-absorbing resin matrix material with the Ni net method of embodiment 1, the water absorbent rate of inhaling deionized water is 280 times.Inhaling the water absorbent rate of " normal saline solution ", is 72 times.The water absorbent rate of inhaling city tap-water is 258 times.
Deviate from water test in the hogwash fat with a kind of made from bracteal leaf of corn provided by the invention one-step synthesis water-absorbing resin matrix material in aqueous media.
Copy that Chinese patent CN101270319 (publication number) is disclosed to be deviate from the hogwash fat water test method with SAP and carry out controlled trial, its step be operating as:
Collect the hogwash fat in certain university dining room, after filtering out solids and clarifying, obtaining density is 0.933g/cm
3Moisture hogwash fat.Use CaCl
2After method was demarcated its water cut, obtaining the aqueous weight percent of this moisture hogwash fat was 3.46wt.%.According to moisture hogwash fat volume (L): High hydrophilous resin weight (g) proportioning is 1: 150; Add several kinds of water-absorbing resins or its mixture in the above-mentioned moisture hogwash fat, at room temperature shook 1 minute, leave standstill then with shaking table; Later every interval was started a shaking table in 1 hour and was shaken 1 minute; Shake 4 after-filtration dischargings, filter out this High hydrophilous resin that has absorbed water, obtain the dehydration hogwash fat with 100 eye mesh screens; Use CaCl once more
2Method is demarcated its water cut, obtains the aqueous weight percent of this moisture hogwash fat; Converse water-absorbing resin or its mixture room temperature thus and deviate from the percentage of water; Its results of comparison is listed in table 1;
The SAP of table 1 water-absorbing resin matrix material of the present invention and other type is to moisture hogwash fat dehydrating effect table
| The title of water-absorbing resin or its mixture | Dehydration rate | Remarks |
| The SAP mixture of the embodiment of the |
42.1％ | Room temperature is 18 ℃ |
| Commercially available starch-acrylic acid-grafted type SAP | 27.6％ | Room temperature is 18 ℃ |
| Commercially available sodium acrylate type SAP | 25.3％ | Room temperature is 18 ℃ |
| The SAP of commercially available starch-wilkinite-acrylic acid-grafted type | 38.6％ | Room temperature is 18 ℃ |
Claims (5)
1. the compound method of made from bracteal leaf of corn one-step synthesis water-absorbing resin matrix material in aqueous media is characterized in that step is following:
The 1st step: the aqueous solution of the required chemical of preparation polymerization
The acrylic acid aqueous solution of A component: 50wt%;
The aqueous sodium hydroxide solution of B component: 15wt%;
The N of C component: 2wt%, the N '-methylene-bisacrylamide aqueous solution;
The ammonium persulfate aqueous solution of D component: 2wt%;
The 2nd step: made from bracteal leaf of corn cut out and dry processing
Made from bracteal leaf of corn is cut into width and is no more than 1 centimeter, length and is no more than 10 centimeters rectangular sheets, and oven dry is 24 hours in 60 ℃ of hot blast environment;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media
The exsiccant made from bracteal leaf of corn that obtains step 2 is put in the A component and soaked 24 hours, and the exsiccant made from bracteal leaf of corn: the A components by weight is 5: 60-70; Then add the B component and neutralize, the exsiccant made from bracteal leaf of corn: the weight ratio of B component is 5: 95-97; Acid-base neutralisation is heat release, adds the C component behind the reaction system cool to room temperature, and the exsiccant made from bracteal leaf of corn: the weight ratio of C component is 5: 14-16; Add the D component subsequently, the exsiccant made from bracteal leaf of corn: the weight ratio of D component is 5: 12-13; Stirred for 5 seconds with 60 rev/mins revolutions, cover liquid level,, synthesize the gel composite of block water-absorbing resin matrix material with 60 ℃ of water bath with thermostatic control heating 1-2 hour with plastic cloth; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.
2. the compound method of a kind of made from bracteal leaf of corn as claimed in claim 1 one-step synthesis water-absorbing resin matrix material in aqueous media is characterized in that step is following:
The 1st step and the 2nd step are with claim 1;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media
The exsiccant made from bracteal leaf of corn that obtains step 2 is put in the A component and soaked 24 hours, and the exsiccant made from bracteal leaf of corn: the A components by weight is 5: 60; Then add the B component and neutralize, the exsiccant made from bracteal leaf of corn: the weight ratio of B component is 5: 95; Acid-base neutralisation is heat release, adds the C component behind the reaction system cool to room temperature, and the exsiccant made from bracteal leaf of corn: the weight ratio of C component is 5: 14; Add the D component subsequently, the exsiccant made from bracteal leaf of corn: the weight ratio of D component is 5: 12; Stirred for 5 seconds with 60 rev/mins revolutions, cover liquid level,, synthesize the gel composite of block water-absorbing resin matrix material with 60 ℃ of water bath with thermostatic control heating 1 hour with plastic cloth; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.
3. the compound method of a kind of made from bracteal leaf of corn as claimed in claim 1 one-step synthesis water-absorbing resin matrix material in aqueous media is characterized in that step is following:
The 1st step and the 2nd step are with claim 1;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media
The exsiccant made from bracteal leaf of corn that obtains step 2 is put in the A component and soaked 24 hours, and the exsiccant made from bracteal leaf of corn: the A components by weight is 5: 65; Then add the B component and neutralize, the exsiccant made from bracteal leaf of corn: the weight ratio of B component is 5: 96; Acid-base neutralisation is heat release, adds the C component behind the reaction system cool to room temperature, and the exsiccant made from bracteal leaf of corn: the weight ratio of C component is 5: 15; Add the D component subsequently, the exsiccant made from bracteal leaf of corn: the weight ratio of D component is 5: 12.5; Stirred for 5 seconds with 60 rev/mins revolutions, cover liquid level,, synthesize the gel composite of block water-absorbing resin matrix material with 60 ℃ of water bath with thermostatic control heating 2 hours with plastic cloth; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.
4. the compound method of a kind of made from bracteal leaf of corn as claimed in claim 1 one-step synthesis water-absorbing resin matrix material in aqueous media is characterized in that step is following:
The 1st step and the 2nd step are with claim 1;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media
The exsiccant made from bracteal leaf of corn that obtains step 2 is put in the A component and soaked 24 hours, and the exsiccant made from bracteal leaf of corn: the A components by weight is 5: 70; Then add the B component and neutralize, the exsiccant made from bracteal leaf of corn: the weight ratio of B component is 5: 96; Acid-base neutralisation is heat release, adds the C component behind the reaction system cool to room temperature, and the exsiccant made from bracteal leaf of corn: the weight ratio of C component is 5: 16; Add the D component subsequently, the exsiccant made from bracteal leaf of corn: the weight ratio of D component is 5: 13; Stirred for 5 seconds with 60 rev/mins revolutions, cover liquid level,, synthesize the gel composite of block water-absorbing resin matrix material with 60 ℃ of water bath with thermostatic control heating 1.5 hours with plastic cloth; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.
5. the compound method of a kind of made from bracteal leaf of corn as claimed in claim 1 one-step synthesis water-absorbing resin matrix material in aqueous media is characterized in that step is following:
The 1st step and the 2nd step are with claim 1;
The 3rd step: one-step synthesis water-absorbing resin matrix material in the aqueous media
The exsiccant made from bracteal leaf of corn that obtains step 2 is put in the A component and soaked 24 hours, and the exsiccant made from bracteal leaf of corn: the A components by weight is 5: 68; Then add the B component and neutralize, the exsiccant made from bracteal leaf of corn: the weight ratio of B component is 5: 96.5; Acid-base neutralisation is heat release, adds the C component behind the reaction system cool to room temperature, and the exsiccant made from bracteal leaf of corn: the weight ratio of C component is 5: 15.5; Add the D component subsequently, the exsiccant made from bracteal leaf of corn: the weight ratio of D component is 5: 12.5; Stirred for 5 seconds with 60 rev/mins revolutions, cover liquid level,, synthesize the gel composite of block water-absorbing resin matrix material with 60 ℃ of water bath with thermostatic control heating 1.8 hours with plastic cloth; Described gel composite oven dry, pulverize, obtain the water-absorbing resin matrix material.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3889678A (en) * | 1973-12-07 | 1975-06-17 | Personal Products Co | Cellulose graft copolymer containing non-ionic and ionic polymer moieties as absorbent media in absorbent dressings |
| CN101134799A (en) * | 2007-08-07 | 2008-03-05 | 西北师范大学 | Method for preparing high-absorbent material by microwave radiation of potato haulm |
| CN101550326A (en) * | 2008-04-02 | 2009-10-07 | 中国科学院沈阳应用生态研究所 | Soil water-holding agent and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3889678A (en) * | 1973-12-07 | 1975-06-17 | Personal Products Co | Cellulose graft copolymer containing non-ionic and ionic polymer moieties as absorbent media in absorbent dressings |
| CN101134799A (en) * | 2007-08-07 | 2008-03-05 | 西北师范大学 | Method for preparing high-absorbent material by microwave radiation of potato haulm |
| CN101550326A (en) * | 2008-04-02 | 2009-10-07 | 中国科学院沈阳应用生态研究所 | Soil water-holding agent and preparation method thereof |
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