CN100482339C - Particulate water absorbent containing water absorbent resin as a main component - Google Patents
Particulate water absorbent containing water absorbent resin as a main component Download PDFInfo
- Publication number
- CN100482339C CN100482339C CNB2004800001047A CN200480000104A CN100482339C CN 100482339 C CN100482339 C CN 100482339C CN B2004800001047 A CNB2004800001047 A CN B2004800001047A CN 200480000104 A CN200480000104 A CN 200480000104A CN 100482339 C CN100482339 C CN 100482339C
- Authority
- CN
- China
- Prior art keywords
- water
- absorbent containing
- water absorbent
- aqueous solution
- quality
- 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.)
- Expired - Lifetime
Links
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- 239000002250 absorbent Substances 0.000 title claims abstract description 148
- 230000002745 absorbent Effects 0.000 title claims abstract description 137
- 229920005989 resin Polymers 0.000 title claims description 228
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 73
- 239000000463 material Substances 0.000 claims abstract description 17
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 130
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 29
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 29
- 238000005342 ion exchange Methods 0.000 claims description 22
- 230000008595 infiltration Effects 0.000 claims description 18
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- 238000002360 preparation method Methods 0.000 description 7
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 235000005911 diet Nutrition 0.000 description 1
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- VFNGKCDDZUSWLR-UHFFFAOYSA-L disulfate(2-) Chemical compound [O-]S(=O)(=O)OS([O-])(=O)=O VFNGKCDDZUSWLR-UHFFFAOYSA-L 0.000 description 1
- 238000010981 drying operation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002118 epoxides Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- FKRCODPIKNYEAC-UHFFFAOYSA-N ethyl propionate Chemical compound CCOC(=O)CC FKRCODPIKNYEAC-UHFFFAOYSA-N 0.000 description 1
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- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- TVZISJTYELEYPI-UHFFFAOYSA-N hypodiphosphoric acid Chemical compound OP(O)(=O)P(O)(O)=O TVZISJTYELEYPI-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229920001427 mPEG Polymers 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- MYSWGNHLJGOCPT-UHFFFAOYSA-N methyl prop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C=C MYSWGNHLJGOCPT-UHFFFAOYSA-N 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- RQAKESSLMFZVMC-UHFFFAOYSA-N n-ethenylacetamide Chemical compound CC(=O)NC=C RQAKESSLMFZVMC-UHFFFAOYSA-N 0.000 description 1
- ZOTWHNWBICCBPC-UHFFFAOYSA-N n-ethyl-n-methylprop-2-enamide Chemical compound CCN(C)C(=O)C=C ZOTWHNWBICCBPC-UHFFFAOYSA-N 0.000 description 1
- COYVWKMZTCAFHO-UHFFFAOYSA-N n-methyl-n-propan-2-ylprop-2-enamide Chemical compound CC(C)N(C)C(=O)C=C COYVWKMZTCAFHO-UHFFFAOYSA-N 0.000 description 1
- WDFKEEALECCKTJ-UHFFFAOYSA-N n-propylprop-2-enamide Chemical compound CCCNC(=O)C=C WDFKEEALECCKTJ-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- RUOPINZRYMFPBF-UHFFFAOYSA-N pentane-1,3-diol Chemical compound CCC(O)CCO RUOPINZRYMFPBF-UHFFFAOYSA-N 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
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- 229920000768 polyamine Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 235000019394 potassium persulphate Nutrition 0.000 description 1
- 238000012673 precipitation polymerization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
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- 229910000077 silane Inorganic materials 0.000 description 1
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- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical compound [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
PROBLEM TO BE SOLVED: To provide a particulate water absorbent showing excellent absorption ability for liquid such as urine and a sanitary material using the same.
Description
Technical field
The present invention relates to the water-absorbing resin is the particulate water absorbent containing of main component, more specifically says, relates to the particulate water absorbent containing that the liquid such as urine sample is had the good absorption ability.
Technical background
Recently, water-absorbing resin has been widely used as the composition of amenities, as paper nappy, sanltary towel, and gatism with pad, to absorb body fluid.The example of this water-absorbing resin comprises: the polyacrylic acid crosslinked polymer of part neutralization; Starch and acrylic acid hydrolysis graft polymers; The saponified copolymer of vinyl acetate resin and acrylate; The hydrolyzed copolymer of acrylonitrile or acrylamide, or it is crosslinked; And the cross-linked polymer of cationic monomer.
Such water-absorbing resin requires to have good performance, is included in the ability of fast Absorption q.s liquid when sweat fluid as body fluid contacts.The performance of other requirement comprises gel strength, and the gel infiltration rate reaches the ability that absorbs liquid from the raw material that contain aqueous fluid.In addition, narrow to size distribution in recent years, or have the water-absorbent resin powder of high-absorbility and low water-soluble content that the requirement that grows with each passing day is arranged.This water-absorbent resin powder also must have under pressure high Test Liquid Permeability of Core is arranged under high absorptivity and the pressure.
For example, following document 1-24 discloses performance parameter and the measuring method that this water-absorbing resin is stipulated.
Specifically, document 1 (U.S. is issued patents 32,649 again) proposes a kind of water-absorbing resin, and it is outstanding aspect jelly grade, solubilized amount and absorbability.(BP 2,267 094B) proposes a kind of water-absorbing resin to document 2, and its Test Liquid Permeability of Core under no pressure is good, and excellent infiltration rate and absorbability are arranged.In addition, document 3 (United States Patent (USP) 5,051,259) document 4 (United States Patent (USP) 5,419,956), document 5 (United States Patent (USP) 6,087,002), and document 6 (European patent 629,441) has proposed to draft the technology of size distribution.
In addition, multiple have the water-absorbing resin of superior absorption capacity and assay method thereof also to propose under various pressure.For example, proposed some water-absorbing resins, its performance or include only water absorbing capacity under the pressure perhaps also comprises other performance, be disclosed in the following document, as document 7 (European patent 707,603), document 8 (European patent 712,659), document 9 (European patent 1,029,886), document 10 (United States Patent (USP) 5,462,972), document 11 (United States Patent (USP) 5,453,323), document 12 (United States Patent (USP) 5,797,893), document 13 (United States Patent (USP) 6,127,454), document 14 (United States Patent (USP) 6,184,433), document 15 (United States Patent (USP) 6,297,335), reach document 16 (U.S. is issued patents Re37 again, 021).
In addition, the water-absorbing resin with excellent in resistance impact (representing with performance degradation) is also reported, see document 17 (United States Patent (USP) 5,140,076) and document 18 (United States Patent (USP) 6,414,214B1).
In addition, the water-absorbing resin of regulation amount of dust for example proposes in document 19 (United States Patent (USP) 5,994,440), and almost achromophil water-absorbing resin for example proposes in document 20 (United States Patent (USP) 6,444,744).As for anti-urine corrosivity, document 21 (United States Patent (USP) 6,194,531) and document 22 (European patent 940,148) proposed to have excellent gel stability and with respect to water-absorbing resin such as the absorbability of the such liquid of L-aqueous ascorbic acid, and document 23 (European patent 1,153,656) discloses a kind of water-absorbing resin that good gas permeability is arranged.In addition, propose to contain hardly the water-absorbing resin of residual monomer at document 24 (European patent 605,215).
It is reported have the water-absorbing resin of particular characteristic also to be applicable to have special performance, shape, and/or the absorbent of density polymer (diaper), see document 25 (United States Patent (USP) 5,147,343), document 26 (United States Patent (USP) 5,149,335), document 27 (European patent 532,002), document 28 (United States Patent (USP) 5,601,452), document 29 (United States Patent (USP) 5,562,646), document 30 (United States Patent (USP) 5,669,894), document 31 (United States Patent (USP) 6,150,582), document 32 (international publication WO02/53198), document 33 (United States Patent (USP) 5,843,059), reaches document 34 (Application No. 2001/4951).
Therefore some water-absorbing resins have been developed in view of these different performances, wherein some is produced and uses at this performance and the water-absorbing resin that possesses this performance, but still have problem, promptly enable control characteristic, water-absorbing resin still can not fully provide this specific character in practical application (as paper nappy).In detail, when water-absorbing resin is applied to amenities, wherein contain a large amount of water-absorbing resins and small amount of fibers material (water-absorbing resin ratio height), its performance is still good inadequately.
Disclosure of an invention
The present invention proposes in view of traditional water-absorbing resin, be to have considered various performances and develop (infiltration rate, there is not the absorbability of pressing under (no-load), the absorbability under the pressure (load), gel strength, durability, solvable amount, granularity etc.), the objective of the invention is to solve traditional problem, the adjustment and the design that are these performances can not produce the satisfied water-absorbing resin of performance in the practical application, and therefore a kind of water-absorbing resin that is suitable for practical application is provided.
Pass through broad research for this reason, the present inventor finds, absorbability is with the variation of salt concentration, promptly the variation of absorbability has a significant impact practical application (as diaper) under specified pressure, and when water absorbing agent (under pressure) just can make water absorbing agent better than traditional product when having constant absorbability and constant water penetration, thereby finish the present invention.These performance neither ones can be realized with out-of-date methods.
In other words, the invention provides a kind of main component that contains and be the particulate water absorbent containing of water-resin for inhaling, it is to make water-soluble unsaturated monomer is crosslinked.This particle size range that water-absorbing resin shape is special and it is particles contained is for being no less than 106 μ m and being less than 850 μ m, and its quality is 90-100% of a water-absorbing resin gross mass.Particulate water absorbent containing has the first salt concentration absorption index, as estimating that as the salt concentration aqueous solution such as grade and by following formula (1) its value is not less than 0.60 with ion exchange water.
(salt concentration absorption index)=(absorbability of the reciprocity salt concentration aqueous solution under 4.83KPa pressure)/(absorbability of equity salt concentration aqueous solution during no pressure) ... .. (1)
Molecule is that particulate water absorbent containing is waiting 60 minutes absorbabilities under 4.83KPa pressure of salt concentration aqueous solution soaking in the formula, and denominator is particulate water absorbent containing and waits 60 minutes absorbabilities under no pressure of salt concentration aqueous solution soaking.
In addition, the invention provides with the water-absorbing resin is the particulate water absorbent containing of main component, and this water-absorbing resin forms by water-soluble unsaturated monomer is crosslinked.Special and the particles contained particle size range of water-absorbing resin shape is 106 μ m-850 μ m, and its quality is no less than 90% of water-absorbing resin gross mass.Particulate water absorbent containing soaks 60 minutes absorbabilities under 4.83KPa pressure when it with ion exchange water and is not less than 50g/g.
In order to more fully understand essence of the present invention and advantage, should consult subsequently detailed description and accompanying drawing.
Brief Description Of Drawings
Fig. 1 is a cross sectional representation, and the measurement mechanism of measuring the gel infiltration index is shown.
Best mode for carrying out the invention
Describe in detail below according to particulate water absorbent containing of the present invention (water absorbing agent).Though the present invention can do various modifications and take other form, below with its special case of example in detail.But should be appreciated that doing like this is not to limit the invention to disclosed special shape, on the contrary, present invention resides in interior all modifications, equivalent and the substitute of the scope of the invention of attached power requirements definition.
Proposed a kind of saline solution (0.9% (quality) NaCl aqueous solution) and multiplely be used for assessing the synthetic urine of the various performances of water-absorbing resin as urine sample.But all these propose all to have ignored a fact, and promptly the people urinates composition and alters a great deal, and is disclosed as aforementioned publication.In fact, the composition of urine is uneven, and it is very big with environment, diet, age, season and various other factors vary.Even same people, according to situation or his health at that time, the composition per minute of urine all is on the turn.
The problem that the present invention exists in view of tradition and proposing.Tradition is with typical solution, as saline solution or the synthetic performance of assessing water-absorbing resin of urinating.In other words, traditional water-absorbing resin of practical application can not change fully adaptation to the urine composition.
By this problem, the present inventor has considered the variation of salt concentration in the urine.
In detail, have found that the ionic strength of adult's urine is substantially equal to the ionic strength of 0.8-1.0% (quality) NaCl aqueous solution, and the ionic strength of baby's urine is substantially equal to the ionic strength of 0.3-0.7% (quality) NaCl aqueous solution.For the neonate, the ionic strength of its urine is substantially equal to the ionic strength of 0.2-0.4% (quality) NaCl aqueous solution.It is not always suitable also finding to assess with the tradition of saline solution (0.9% (quality) NaCl aqueous solution) assessment water-absorbing resin performance, and problem is in fact arranged in actual applications, because it does not consider the actual salt concentration urinated.
In addition, the reason that traditional water-absorbing resin does not possess the practical application desired properties is that urine is urinated experience ion-exchange when drainage is oozed out by diaper, so improvement (decline) gradually takes place salt concentration in the urine.In fact, when urine oozed out diaper, the salt concentration of urine changed with different rates at the diaper different parts.
Therefore, the present inventor finds, when particulate water absorbent containing is main component with the water-absorbing resin and forms by water-soluble unsaturated monomer is crosslinked, when this water-absorbing resin has the particle size range of special shape and its particle is 106 μ m-850 μ m, its quality accounts for water-absorbing resin gross mass 90-100%, and when the first salt concentration absorption index of particulate water absorbent containing by formula (1) (definition later on) calculating and with ion exchange water as etc. during the salt concentration aqueous solution, just can provide absorbability constant senior particulate water absorbent containing, no matter whether salt concentration changes.
Particulate water absorbent containing of the present invention provides good gel infiltration index, no matter whether salt concentration or institute's plus-pressure change.Therefore, when with this absorbent as the abundant permeation liquid of absorbing material, thereby improve absorbate quantity.In fact can effectively prevent to leak with particulate water absorbent containing of the present invention.
Describe particulate water absorbent containing of the present invention below in detail.
(water-absorbing resin is the cross-linked polymer of water-soluble unsaturated monomer)
Water absorbing agent of the present invention is main component with the water-absorbing resin, and can comprise a small amount of other composition, comprises additive and water.The characteristic of this water absorbing agent is to contain water-absorbing resin, and the pure content of resin is roughly 50-100% (quality), and 70-100% is better, and 85-100% is better, and 95-100% is better.This water absorbing agent shape is special, the following describes.In addition, water absorbing agent has the physical characteristic that meets particular value.
Water-absorbing resin of the present invention is a kind of cross-linked polymer, and its can bulking, and is water insoluble substantially and be the well-known bulking cross-linked polymer of the water-fast basically anion of a kind of formation, nonionic or cationic hydrogel.This water-absorbing resin internal crosslinking also can surface-crosslinked or surface treatment.In the present invention, these multi-form water-absorbing resin general designations " water-absorbing resin ".But will there be the water-absorbing resin of surface-crosslinked water-absorbing resin and other tabulation hand-deliver connection to make a distinction under some situation as required.
In the present invention, " bulking " is meant to immerse in the ion exchange water and can absorbs 5g/g water at least, preferably be no less than the water of 50-1000g/g.Equally, among the present invention, " water insoluble basically " refers to that water-soluble amount (water-soluble amount of polymers) of water-absorbing resin is 0-50% (quality), and 0-20% (quality) is better, and 0.01-15% (quality) is better, and 0.1-10% (quality) also will be got well.In these several different range, preferred especially 0.1-5% (quality), most preferably 0.1-3% (quality).(noticing that the method for absorbability and water-soluble amount of measuring is seen following example)
Water-absorbing resin is a kind of polymer, or two or more mixture of polymers.Say in detail, preferably a kind of polymer that contains acid group of water-absorbing resin, or contain the polymer of carboxylic acid or carboxyl (carboxylate) or these mixture of polymers.More detailed theory, the water-absorbing resin main component is preferably a kind of to be the cross-linked polymer that water-soluble cross-linking monomer of main component is polymerized with acrylic acid and/or its salt (nertralizer), promptly the polyacrylate cross-linked polymer can contain the grafting composition if necessary.
The acrylate (these material total amounts are no more than 100% (mole)) of the acrylic acid and 100-50% (mole) that preferably contains 0-50% (mole) as the acrylic acid and the acrylate of water-absorbing resin structural unit, be more preferably acrylic acid and contain 10-40% (mole), acrylate contains 90-60% (mole) (these material total amounts are no more than 100% (mole)).Acrylate is called " neutralization ratio " to the molar ratio of acrylic acid and acrylate total amount.
The acrylate that constitutes the unit as water-absorbing resin is the acrylic acid formation that neutralizes in water-absorbing resin.Neutralization can be finished with monomeric form before polymerization, also can finish with polymer form in polymerization process He after the polymerization.On the other hand, neutralization can these neutralization method be finished jointly.Constitute the unit as water-absorbing resin, contained salt has: alkali metal salt, and as (gathering) PAA, (gathering) potassium acrylate, and (gathering) acrylic acid lithium; (gathering) ammonium acrylate; And (gathering) acrylic amine.
In order to promote polymerization and restriction colour developing, preferably contain p methoxy phenol (also being quinhydrones-methyl ether) as the acrylic acid of the water-soluble unsaturated monomer of the present invention.Acrylic acid p methoxy phenol content is no more than 200ppm with respect to the acrylic acid quality, and 10-160ppm quality is better, and 20-140ppm quality also will be got well, 30-120ppm better quality.In these several scopes, 40-100ppm (quality) is preferred especially, and 50-90ppm (quality) most preferably.The quality of protoanemonin and/or furfural is acrylic acid 0-20ppm in the acrylic acid, and 0-10ppm (quality) is better.In these scopes, 0-3ppm (quality) is preferred especially, and 0-1ppm (quality) most preferably.
Being used to produce the water-soluble unsaturated monomer of the present invention of water-absorbing resin, can having only acrylic acid (or its salt) basically, also can be other several water-soluble unsaturated monomers.On the other hand, these different types of water-soluble unsaturated monomers comprise acrylic acid (or its salt), can use together.The non-limiting unsaturated monomer of non-acrylic acid (and salt) comprising: the anion unsaturated monomer, as methacrylic acid, maleic acid, the vinyl sulfonic acid ester, styrene sulfonate, 2-(methyl) acrylamide-2-methyl propane sulfonic acid ester, 2-(methyl) acryloyl ethane sulfonic acid ester, 2-(methyl) acryloyl propane sulfonic acid ester and their salt: comprise hydrophilic radical nonionic unsaturated monomer, as acrylamide, Methacrylamide, N-(methyl) acrylamide ethyl ester, N-N-(methyl) acrylamide propyl ester, N-(methyl) acrylamide isopropyl ester, N-N-dimethyl (methyl) acrylamide, 2-hydroxyethyl (methyl) acrylate, 2-hydroxypropyl (methyl) acrylate, methoxy poly (ethylene glycol) (methyl) acrylate, polyethyleneglycol (methyl) acrylate, vinylpyridine, N-vinyl pyrrolidone, N-Antiepilepsirin, N-acryloyl pyrrolidines, and N-vinyl acetamide; And cation unsaturated monomer, as N-N-diethylamino ethyl (methyl) acrylate, N-N-diethylamino ethyl (methyl) acrylate, N-N-dimethylaminopropyl (methyl) acrylate, N-N-dimethylaminopropyl (methyl) acrylamide, and their quaternary salt.These unsaturated monomers both can be used separately, but also two or more appropriate combination is used.
For making water-absorbing resin that desirable performance be arranged, the present invention is a main component with acrylic acid and salt thereof.Can use other the water-soluble unsaturated monomer that exemplifies above in case of necessity together, its total amount is generally 0-30% (mole), and 0-20% (mole) is better, and 0-10% (mole) is better.
So that obtain water-absorbing resin of the present invention, can adopt polymerisation in bulk or precipitation polymerization for making monomer polymerization.But consider the polymer properties of generation, the controllability of polymerization, the absorption characteristic of swell gel, better polymerization is the aqueous polymerization and the reversible suspension polymerisation of using monomer solution.When using monomer solution, monomer concentration is determined according to the temperature and the monomeric species of solution in the aqueous solution (to call " monomer solution " in the following text), therefore is not limited to arbitrary particular value.But this concentration is preferably 10-70% (quality), and 20-60% (quality) is better.When carrying out polymerization, can adopt the solvent of non-water as required with the aqueous solution.Solvent species is not limit.
In a kind of method of aqueous polymerization, monomer solution polymerization in a both arms kneader is pulverized the hydrogel cross-linked polymer that forms simultaneously.In another polymerization, monomer solution is fed to predetermined container or conveyer belt, and the equipment of application examples as meat block slicing machine will be pulverized because of the gel that polymerization produces.
For initiated polymerization, can use radical polymerization initiator, as potassium peroxydisulfate, Ammonium Persulfate 98.5, sodium peroxydisulfate, TBHP, hydrogen peroxide and 2, two (2-amidino groups-propane) dihydrochlorides of 2 '-azo; Or the use Photoepolymerizationinitiater initiater, as 2-hydroxy-2-methyl-1-phenyl-propane-1-ketone.These polymerization initiators can use with reducing agent, can be beneficial to the decomposition of polymerization initiator.That is, can use redox initiator, polymerization initiator and reducing agent are combined.The non-limiting example of reducing agent comprises: sulfurous acid (disulfate), as sodium sulfite and sodium hydrogensulfite; L-ascorbic acid (L-ascorbate); Reducing metal (reducing metal salt) is as ferrous salt; And amido.Consider residual monomer, absorption characteristic and other performance, the polymerization initiator use amount is generally 0.001-2% (mole) of monomer, and 0.01-1% (mole) is better.
Polymerization can cause by applying activation energy, as radiation, electron ray or ultraviolet ray, to reaction system.At this moment, above-mentioned polymerization initiator can use together.The reaction temperature of polymerisation is preferably in 15-130 ℃, and 20-120 ℃ better, but be not determinate, and they should be according to the polymerization initiator kind of monomer kind, employing, and adjustment such as reaction temperature.
Water-absorbing resin of the present invention has cross-linked structure (crosslinked in so-called) at its intramolecule.Crosslinked available any method produces in this, as long as the absorbent finished product is water-fast.Specifically, also can finish interior crosslinked (self-crosslinking) without crosslinking agent.But preferably crosslinked in finishing by the copolymerization synthetic reaction of crosslinking agent (internal crosslinker), these crosslinking agents have in a molecule and are no less than 2 polymerisable unsaturated groups or are no less than 2 active group.
The example of this internal crosslinker comprises: N, N '-di-2-ethylhexylphosphine oxide (methyl) acrylamide, (gathering) ethylene glycol bis (methyl) acrylate, (gathering) propane diols two (methyl) acrylate, three (methacryloxypropyl methyl) propane, glycerine three (methyl) acrylate, glycerine esters of acrylic acid (methyl) acrylate, oxirane sex change three (methacryloxypropyl methyl) propane, six (methyl) acrylic acid pentaerythritol ester, triallyl cyanurate, triallyl isocyanurate, TAP, amine triallyl, poly-(methyl) allyloxy alkane, (gathering) ethylene glycol diglycidylether, the glycerine diglycidyl ether, ethylene glycol, polyethylene glycol, propane diols, glycerine, pentaerythrite, ethylenediamine, ethylene carbonate, acrylate, polymine, and GMA.
These internal crosslinkers can use separately, also can severally make appropriate combination and use.Internal crosslinker can once or divide and add in the reaction system several times.When using one or more internal crosslinkers, consider absorption characteristic or other performance of water absorbing agent finished product, will comprise that preferably the mixture of polymerisable unsaturated group more than two kinds is used for polymerization all the time.
In order to obtain to require the water-absorbing resin and the water absorbing agent of performance, the consumption of internal crosslinker is 0.001-2% (mole) with respect to the ratio of water-soluble unsaturated monomer (not comprising internal crosslinker), 0.005-1% (mole) is for well, 0.005-0.7% (mole) is better, 0.01-0.5% is better, 0.01-0.2% (mole) is preferred especially in this scope, and 0.03-0.15% (mole) most preferably.
When adopting internal crosslinker in that water-absorbing resin is inner when forming cross-linked structure, internal crosslinker before water-soluble polymerization of unsaturated monomers, among or add in the reaction system afterwards, or in water-soluble unsaturated monomer and the back add.
Note, when polymerization, can add following material to reaction system: the hydrophilic polymer of 0-50% (quality) (with respect to the quality of water-soluble unsaturated monomer), as starch and cellulose, starch and cellulosic derivative, polyvinyl alcohol, polyacrylic acid (polyacrylate), and cross linked polyacrylate (crosslinked polyacrylate); The blowing agent of 0-10% (quality) (with respect to the quality of water-soluble unsaturated monomer), as (hydrogen) carbonic ester, carbon dioxide, azo-compound, and nonactive organic solvent; Surfactant; Chelating agent; And chain-transferring agent, as hypophosphorous acid (hypophosphate).
Dry during in polymerization or after the polymerization through hydrogel cross-linked polymer that polymerization process obtains.Bake out temperature is generally 60-250 ℃, and 100-220 ℃ better, and 120-200 ℃ best.Drying time is different with the long-pending drying oven kind that reaches water content and use of polymer surfaces.Usually drying time water content was as requested elected 1 minute as-3 hours, and 10 minutes-2 hours better.The water content of water-absorbing resin of the present invention is restriction especially not.(as term used herein, " water content " is defined as institute's water content in the water-absorbing resin, with the ratio metering of its 1 gram water-absorbing resin weightlessness after drying 3 hours under 180 ℃ in the water-absorbing resin quality before drying).But consider that the water-absorbing resin finished product is a powder, at room temperature can flow that therefore for well, 0.3-15% (quality) is better with 0.2-30% (quality) for water content, 0.5-10% (quality) is best.(noticing that term among the present invention " water-absorbing resin " also can be used even only contain the low amounts of water that is no more than 30% (quality)).
Manufacture process of the present invention comprises pulverizing process, and wherein the hydrogel cross-linked polymer drying operation that obtains with polymerization process is ground into granular water-absorbent resin with pulverizer again.The particle of this water-absorbing resin is not limited to a kind of shape, can be spherical, particle shape or irregular particle shape.But the hydrogel cross-linked polymer is preferably in and wears into irregular particle shape in the pulverizing process.
Among the present invention, the ratio of fine grained in water absorbing agent or water-absorbing resin preferably as far as possible little (granularity less than 106 μ m, or less than 150 μ m).Concrete scope is: fine grain ratio is less than 10% (quality), and is less than 5% for well, less than 3% better, less than 2% better, best less than 1%.In addition, in the present invention, a part of coarse granule in the water-absorbing resin (granularity is not less than 850 μ m, or is not less than 500 μ m) is preferably also few as far as possible.In other words, the particles contained diameter of water-absorbing resin of the present invention is 850-106 μ m (preferably 850-150 μ m), and the ratio that it accounts for is 90-100% (quality), and 97-100% (quality) is for well, 98-100% (quality) is better, and 99-100% (quality) is best.
Subsequently, granular water-absorbent resin becomes particulate water absorbent containing of the present invention by surface modification.Surface modification of the present invention both can also can be coated non-reactive additives at particle surface, as inorganic powder with particle surface or surface portion (degree of depth 0.001 μ m-tens of microns).
Consider the performance of water-absorbing resin, surface modifier is (as surface crosslinking agent in the water-absorbing resin of 100 parts (quality), or non-reactive additives, as water-fast fine grained) amount ranges be 0.001-10 parts (quality), 0.01-8 parts (quality) is better, 0.05-5 parts (quality) is better, 0.1-2 parts (quality) are best.
The surface-crosslinked crosslink density of water-absorbing resin near surface that makes is higher than granule interior, thereby improves the water-absorbing resin performance.By adding one or more surface crosslinking agents (being called " second crosslinking agent ") to water-absorbing resin, thereby only take place crosslinked when surface-crosslinked on the water-absorbing resin surface to be different from internal crosslinker.
The dehydrated crosslinking agent is used as surface crosslinking agent.When containing carboxyl in the water-absorbing resin, the special case of surface crosslinking agent comprises: the crosslinking agent of hydroxyl, as polyalcohol; Contain amino crosslinking agent, as polyamines; And the ring-type crosslinking agent, when ring is open, hydroxyl or amino be can produce, thereby hydroxyl or the amino cross-linking reaction that takes place made.The ring-type crosslinking agent can be alkylene carbonate, Dan oxazolidone compound, Duo oxazolidone compound or oxetane compound (as 3-methyl-3-expoxy propane methyl alcohol).
The special case of dehydrated crosslinking agent has: polyol compound (as propane diols, 1,3-pentanediol, 2-methyl isophthalic acid, 3-pentanediol, glycerine, 1,4-butanediol, and 1,5-pentanediol); The alkylene carbonate compound, as 1,3-dioxolane-2-ketone and 4-methyl isophthalic acid, 3-dioxolane-2-ketone; And (gathering) oxetane compound (as 3-methyl-3-oxetane methanol).In order to make the present invention that optimum efficiency be arranged, the dehydrated crosslinking agent of use is preferably selected polyalcohol, alkylene carbonate, oxazolidone compound for use, is reached (gathering) oxetane compound.Preferably often use polyalcohol.
Except above-mentioned dehydrated crosslinking agent, other example of surface crosslinking agent has: epoxide (as the ethylene glycol bisthioglycolate Synthesis of Oligo Ethylene Glycol, and r-glycidol oxygen propyl trimethoxy silicane) Ji Ju oxazoline compound (as 1,2-Yi Xi bisoxazoline), silane coupler (as γ-An Bingjisanjiayangjiguiwan), the polyaziridine compound is (as 2, the two methybutanes-three [3-(1-aziridinyl) propionic ester] of 2-), reach the non-dehydrated crosslinking agent of polyvalent metal (as beryllium, magnesium, calcium, strontium, zinc, aluminium, iron, chromium, manganese, titanium and zirconium).
Surface crosslinking agent available water and/or hydrophilic organic solvent mix with water-absorbing resin.
The water yield that is used as solvent is 0.1-10 parts of 100 parts of water-absorbing resin quality, and 0.5-8 parts (quality) is better, and 1-5 parts (quality) are best.
The example of hydrophilic organic solvent comprises: alcohol, as ethanol, propyl alcohol, isopropyl alcohol; Ketone is as acetone; Ether, as diox, alkoxyl (gathering) ethylene glycol, and oxolane; Acid amides is as epsilon-caprolactams; And sulfoxide, as dimethyl sulfoxide (DMSO).The consumption of hydrophilic organic solvent is that 0-10 parts of 100 parts of water-absorbing resin quality are better, and 0-5 parts (quality) is better, and 0-3 parts (quality) are best.
The mixed method of surface crosslinking agent is not limited to a certain method.For example, surface crosslinking agent available water and hydrophilic organic solvent dissolve surface crosslinking agent separately and mix with water-absorbing resin.On the other hand, surface crosslinking agent can be dissolved in simultaneously in water and the hydrophilic organic solvent and mix.In addition, the surface crosslinking agent in water and/or the hydrophilic organic solvent can mix with dosage separately with water-absorbing resin.But surface crosslinking agent preferably mixes with solvent (water and/or organic solvent) earlier, adds in the water-absorbing resin with aqueous solution form subsequently.
Surface crosslinking agent also can mix with the hydrophilic or hydrophobic polymer phase of inorganic powder (being a kind of water-fast fine grained), surfactant in addition, as long as particulate water absorbent containing of the present invention still can work.
In these different mixed methods, the surface crosslinking agent in the water-soluble and/or hydrophilic organic solvent preferably dropwise mixes with water-absorbing resin.Surface crosslinking agent in the water-soluble and/or hydrophilic organic solvent sprays in the water-absorbing resin better.Mixed liquor is atomised to 0.01-300 μ m, and 0.01-200 μ m are better.The temperature range of solution to be painted is the boiling point of 0 ℃-solution, and 5-50 ℃ better, and 10-30 ℃ best.Consider that mixing is convenient and stable, the powder temperature scope of water-absorbing resin is 0-80 ℃ before mixing, and considers that mixing is convenient, and 40-70 ℃ better.
The kind of the blender that uses during mixing is unrestricted, as long as it can powerfully stir, reaches even mixing, produces powder.The example of this blender has: cylindrical mixer, double wall cone-type mixer, high-speed stirred formula mixer, wedge shape mixer, strip-type mixer, screw mixer, fluid-bed furnace formula rotating disk mixer, compressed air mixer, double-arm kneader, interior mixer, pulverizer, drum mixer, screw extruder.
When heating when in mixed processes, carrying out, heat time heating time with 1-180 minutes for well, better 5-100 minutes were best in 3-120 minutes.Heating-up temperature (by the definition of the temperature of heated medium or material) with 100-250 ℃ for well, 140-220 ℃ are better, 150-230 ℃ better, 160-220 ℃ are best.
The heating of available common drying machine or baker, for example plough groove type mixing drier, rotary-drum drier, disk dryer, fluidized bed type drier, air dryer, and infared dryer.
When surface modification occurs in the water-absorbing resin production process of the present invention, can be with the surface-crosslinked while or do not take place simultaneously such as the such additive of inactive surfaces activator, inertia deodorant, nonactive fine inorganic particles.Refer to additive and water-absorbing resin Fails To Respond basically at this 'inertia'.Preferably inorganic or organic fine grained of surfactant and nonactive fine inorganic particles or aliphatic acid (as LCFA or its salt) are stated as follows.These materials are preferably in when surface-crosslinked and add, and also can not add simultaneously.
Among the present invention, the cationic polymer mixing material that adds as the modifying surface of absorption resin additive can improve the performance of water-absorbing resin, as is easy to anchor on the amenities.The population mean molecular weight of cationic polymer mixing material is with 2000-1000000 for well, and 5000-500000 is better, and 10000-500000 is best.Making the organic compound that the modifying surface of absorption resin additive uses is aliphatic acid or its salt, preferably LCFA or its salt.
The cationic polymer mixing material can directly add, or adds with solution (aqueous solution) form.The preferred example of cationic polymer mixing material is: the partial hydrolysate of the condensation product of polymine, polyvinylamine, polyacrylamide, polyamide and chloropropylene oxide, poly-amidine, poly-(N-vinyl formal), and the salt of these compounds.
In the present invention,, therefore can improve the permeability of water-absorbing resin, when absorbing moisture, can improve the water-absorbing resin resistance to blocking owing to being additive with water-fast fine grained.The particle mean size that the water insoluble fine grained of organic or inorganic is suitable for is 0.0001-10 μ m (diameter), and 0.001-1 μ m is better, 0.001-0.1 μ m better (particle diameter is measured with the Ku Erte calculator).More detailed theory, water-fast fine grain material can be used silica (name of an article: Aerosil, by Nippon Aerosil Co., Ltd produces), titanium oxide or aluminium oxide.Mixed method is just like dry blending or slurries blending.
Water insoluble fine grain consumption is to be no less than 10 parts of 100 parts of water-absorbing resin quality, and 0.001-5 parts (quality) is better, and 0.01-2 parts (quality) are best.
[manufacturing process of particulate water absorbent containing]
Following technology 1-3 is the preferred embodiments according to particulate water absorbent containing manufacturing process of the present invention.
[technology 1]
Polyacrylic acid (salt)-cross-linked polymer (water-absorbing resin) is with preceding method preparation, preferably uses the water soluble unsaturated monomer that contains a small amount of protoanemonin under the situation of metoxyphenol having.The water-absorbing resin that makes like this, its particle size is modulated to above-mentioned scope, and the absorbability of not having under the pressure for 0.90% (quality) NaCl aqueous solution (60 minutes values) is adjusted to 15-27g/g.Subsequently, preferably by the surface-crosslinked water-absorbing resin generation surface modification that makes, thereby form particulate water absorbent containing of the present invention, it is 10-27g/g for the absorbability (60 minutes values) that 0.90% (quality) NaCl aqueous solution does not have under the pressure, 12-27g/g is better, 15-27g/g is better, and 17-27g/g also will get well, and 18-22g/g is best.
[technology 2]
Polyacrylic acid (salt) cross-linked polymer (water-absorbing resin) is having under the situation of metoxyphenol water-soluble unsaturated monomer of use prepare as stated above.Subsequently the granularity of water-absorbing resin is transferred to above-mentioned particular range, and will 0.90% (quality) NaCl aqueous solution not had relative absorbability under the pressure (following definition) and be transferred to 10-27g/g, 12-27g/g is for well, and 15-27g/g is better, 17-25g/g is better, and 18-22g/g also will get well.After this, the fine inorganic particles by above-mentioned particular range is coated on the surface of the water-absorbing resin that its granularity and absorbability (not having 60 minutes values when pressing) are adjusted, thereby forms particulate water absorbent containing of the present invention.
[technology 3]
The water soluble unsaturated monomer of handy a small amount of protoanemonin prepares polyacrylic acid (salt) cross-linked polymer (water-absorbing resin) as stated above having under the situation of metoxyphenol.Subsequently the granularity of water-absorbing resin is adjusted to above-mentioned scope, will not have under the pressure the relative absorbability (values after 60 minutes) of 0.90% (quality) NaCl aqueous solution is adjusted to 17-25g/g, 18-22g/g is better.After this, aliphatic acid or its salt are coated in the surface of the adjusted water-absorbing resin of its granularity and absorbability (following 60 minutes values of no pressure), thereby form particulate water absorbent containing of the present invention.
Preferably crosslinked according to above-mentioned technology 2 and technology 3 at the granular water-absorbent resin that absorbs resin surface coating acquisition, make under the no pressure absorbability (60 minutes values) adjust to 10-27g/g to 0.90% (quality) NaCl aqueous solution, 12-27g/g is for well, 15-27g/g is better, 17-25g/g is better, and 18-27g/g is best.
" absorbability (60 minutes values) of 0.90% (quality) NaCl aqueous solution under the no pressure " used herein refers to particulate water absorbent containing in the absorbability of soaking 0.90% (quality) NaCl aqueous solution particulate water absorbent containing (water-absorbing resin) after 60 minutes under the pressure.At this, use excessive 0.90% (quality) NaCl aqueous solution, so it can not absorbed by particulate water absorbent containing all.
People think that easily traditional water absorbing agent (water-absorbing resin) has high absorbability.In fact, the absorbability of the main product of having bought in the market generally is not less than 30g/g, and it is better to be not less than 35g/g, and it is better to be not less than 40g/g.Although this trend is arranged, the present invention will not have water-absorbing resin under the pressure audaciously when novel particulate water absorbent containing is provided absorbability is limited in the scope that is lower than traditional water-absorbing resin.
In addition, water absorbing agent of the present invention through after the surface treatment to 0.90% (quality) NaCl aqueous solution in the absorbability under the pressure (60 minutes value) preferably in 15-27g/g scope, 17-25g/g is better." to the absorbability (60 minute value) of 0.90% (quality) NaCl aqueous solution under pressure " used herein refers to that particulate water absorbent containing soaks (contact) 0.90% (quality) NaCl aqueous solution absorbability under 4.83KPa pressure in the time of 60 minutes.
The control method of the absorbability of particulate water absorbent containing is the quality of control surface reagent treatment and/or reaction condition etc.Therefore, the crosslink density of water-absorbing resin is adjusted before being preferably in surface treatment in the polymerization process, thereby makes it reach 40-15g/g, 35-16g/g, or 30-17g/g to the absorbability of 0.90% (quality) NaCl aqueous solution under no pressure.In addition, the granularity of water-absorbing resin is controlled in the above-mentioned particular range before the surface treatment.
[water absorbing agent of the present invention]
The particulate water absorbent containing of the present invention that obtains like this, its excellent performance part is that the absorbability under its pressure (AAP) depends on the salt concentration that absorbs liquid hardly, even under the 4.83KPa high pressure.More detailed theory, in actual applications, water absorbing agent of the present invention its performance with regard to absorbability is constant, no matter how many salt concentrations of urine is, in other words, the water absorbing properties of water absorbing agent remains on desired horizontal, no matter the vicissitudinous situation of salt concentration when using diaper or in the diaper.
Particulate water absorbent containing of the present invention is main component with the water-absorbing resin, and this water-absorbing resin is the cross-linked polymer of water-soluble unsaturated monomer.Particulate water absorbent containing comprises granular water-absorbent resin, and its particle size range is 106 μ m (preferably being not less than 150 μ m)-850 μ m, accounts for 90-100% of the contained water-absorbing resin gross mass of particulate water absorbent containing.The granular water-absorbent resin that particulate water absorbent containing comprises, its granularity are preferably between the 150 μ m-850 μ m, account for more than 95% of contained water-absorbing resin gross mass of particulate water absorbent containing (hereinafter to be referred as " particle "), are preferably in more than 98%.The ensemble average granularity of granular water-absorbent resin is preferably 200-700 μ m, and 300-600 μ m are better.In these different range, 350-550 μ m are preferred especially, and 400-500 μ m most preferably.
Diameter should not surpass 10% (quality) less than the particle total amount of 150 μ m, because it can stop such as blood or urinate such diffusion of body fluids to water absorbing agent.Another reason is, when being absorbent with this water absorbing agent, it increases the area of ingress of air, and particulate water absorbent containing is dissolved easily as a result.In addition, the particle total amount that surpasses 850 μ m should not surpass 10% (quality) yet, because it reduces the water absorbing agent rate of water absorption.
In addition, except the granularity of prescribed limit, the absorbability of particulate water absorbent containing of the present invention under pressure is constant, no matter salt concentration how.In the present invention, the solution (0-0.90% (quality) NaCl aqueous solution) that is defined as different salinity of the absorbability under the pressure is soaking the absorbability that records behind the certain hour under the 4.83KPa pressure.Absorbability has found that it is to adapt to the variation of the body-fluid concentration as urine in the practical application most under the pressure thus defined.
More particularly, except the granularity of prescribed limit, water absorbing agent of the present invention has the first salt concentration absorption index, is when waiting salt concentration aqueous solution, to record its value by formula (1) and be not less than 0.60 when using ion exchange water.
(salt concentration absorption index)=(in the absorbability of the inferior salt concentration aqueous solution of 4.83KPa pressure)
/ (absorbability of the inferior salt concentration aqueous solution of no pressure) ... ... (1)
In the formula, molecule is to soak (contact) the salt concentration aqueous solution of etc.ing absorbability under 4.83KPa pressure after 60 minutes when particulate water absorbent containing, and the denominator aqueous solution such as salt concentration such as grade that to be the particulate water absorbent containing immersion excessive absorbability under the no pressure after 60 minutes.
The first salt concentration absorption index to be to be not less than 0.70 for well, is not less than 0.80 better, is not less than 0.90 better, is not less than 0.95 best.The first salt concentration absorption index is bad less than 0.60, because at this moment to the absorbability under the specific salt concentration aqueous solution water-absorbing resin pressure along with salt concentration changes (decline), the i.e. salt concentration variation (decline) that causes by the diaper diffusion because of urine, and great changes have taken place (fluctuating).Enough performances are arranged when at this moment being difficult to guarantee practical application.When the first salt concentration absorption index upper limit is too high, also have same phenomenon.Therefore, the upper limit of the first salt concentration absorption index to be to be no more than 1.20 for well, is no more than 1.10 better.(it should be noted that index 0.60 and 0.600 is the same.After this manner, when the value of narration salt concentration absorption index or salt tolerance index, only provide the first two numeral of decimal point the right).
In addition, except the viscosity and the first salt concentration absorption index of prescribed limit, particulate water absorbent containing of the present invention should have other following performance, to guarantee the variation (decline) along with the salt concentration of urine, the salt concentration that promptly sees through the urine of diaper changes (decline), and the absorption of urine is stable.
Specifically, particulate water absorbent containing of the present invention, its second salt concentration absorption index preferably is not less than 0.80 when measuring with above-mentioned formula (1), and the wherein said second salt concentration absorption index is the salt concentration absorption index when waiting salt concentration aqueous solution to be 1% (quality) NaCl aqueous solution.The second salt concentration absorption index is not less than 0.90 for well, is not less than 0.95 better, and the upper limit of the second salt concentration absorption index is not more than 1.20, preferably is not more than 1.10.
In addition, except granularity and the first salt concentration absorption index prescribed limit, particulate water absorbent containing of the present invention preferably have third and fourth, five, six salt concentration absorption indexs, they wait the salt concentration aqueous solution respectively is 0.30%, 0.50%, 0.70%, 0.90% (quality) NaCl aqueous solution and measuring with above-mentioned formula (1), wherein said third and fourth, five, six salt concentration absorption indexs have at least one to be not less than 0.90.The 3-6 salt concentration absorption index preferably is not less than 0.95, and its upper limit generally is not more than 1.20, preferably is not more than 1.10.
In addition, except granularity and the first salt concentration absorption index inside and outside prescribed limit, in the particulate water absorbent containing of the present invention, its average salt concentration absorption index as in third and fourth, the mean value of five, six salt concentration absorption indexs, preferably be not less than 0.90.Average salt concentration absorption index preferably is not less than 0.95, and its upper limit generally is not more than 1.20, preferably is not more than 1.10.In addition, the standard of tolerance of average salt concentration absorption index is preferably 0-0.100,0-0.05 better.
In addition, except granularity and the first salt concentration absorption index inside and outside prescribed limit, first salt tolerance index of particulate water absorbent containing of the present invention is not less than 0.40 when calculating as the salt concentration aqueous solution such as grade and by following formula (2) with 0.10% (quality) NaCl aqueous solution.
(salt tolerance index)=(waiting the absorbability of the salt concentration aqueous solution under no pressure)/
(absorbability of ion exchange water under no pressure) ... (2)
Molecule is that particulate water absorbent containing soaks the excessive salt concentration aqueous solution that waits and do not have water absorbing capacity pressure under in the time of 60 minutes in the formula, and denominator to be particulate water absorbent containing immersion ion exchange water do not have the absorbability under the pressure in the time of 60 minutes.The lower limit of first salt tolerance index preferably is not less than 0.50, and the upper limit generally is not more than 1.20, preferably is not more than 1.10.
Absorbability is in prescribed limit (15-27g/g) under the no pressure of particulate water absorbent containing of the present invention.For 0.90% (quality) NaCl aqueous solution, absorbability (60 minutes values) is 10-27g/g, and 12-27g/g is for well, and 15-27g/g is better, and 17-25g/g is better, and 18-22g/g is best.
In addition, particulate water absorbent containing of the present invention, its gel infiltration index (GPI, unit: 10
-7* cm
3* s * g
-1, below omit and do not write) preferably be not less than 10.According to broad research result to the variety of issue of traditional water absorbing agent, the present inventor finds, the gel infiltration index (GPI) of tradition water absorbing agent is along with the increase of salt concentration (variation that causes salinity by the ion-exchange or the motion of liquid in ambient environmental conditions or the absorbent), or the increase of pressure (changing the pressure that causes by the personnel's that use absorbent weight or posture changes) and reducing greatly.Have found that this absorbent that is unfavorable for expanding is to the absorbent solution infiltration of (as urinating).On the other hand, particulate water absorbent containing of the present invention can guarantee that the gel infiltration rate is stable, no matter salt concentration or pressure have no change.Therefore, use particulate water absorbent containing of the present invention, solution is osmotic absorbent (diffusion area increase) fully.In addition, this absorbent can absorb more solution and can not make leak of liquid.The value of GPI preferably is not less than 15, is not less than 20 better.Explain GPI in the example below in detail.
In particulate water absorbent containing of the present invention, the GPI to ion exchange water under 2.07KPa pressure is not less than 10, is not less than 15 for well, is not less than 20 better.This scope of GPI is far above the GPI scope 0-1 of traditional absorbent, and can not descend much with the raising of pressure.In addition, in particulate water absorbent containing of the present invention, the GPI of 0.3-0.9% (quality) NaCl aqueous solution under 2.07KPa pressure is not less than 10, is not less than 20 for well, is not less than 50 better, is not less than 100 better, is not less than 150 best.These scopes of GPI are far above 0 to tens of the GPI of traditional absorbent, and can not increase with salt concentration and descend a lot.In addition, in particulate water absorbent containing of the present invention, the GPI of 0.7% (quality) NaCl aqueous solution under 4.83KPa pressure is not less than 10, is not less than 15 for well, is not less than 20 better.These scopes of GPI are far above traditional absorbent GPI0-1, and it is a lot of can not descend with the salt concentration raising.In fact, the GPI of 0.3-0.9% (quality) NaCl aqueous solution under 2.07KPa have only very little variation and be not less than 150 o'clock stable.As mentioned above, particulate water absorbent containing of the present invention is stable and GPI is high, does not change no matter salt concentration or pressure have, thereby good absorbent properties (diffusion area is big, and absorption rate is fast) are arranged during in actual applications as absorbent.
In addition, particulate water absorbent containing of the present invention has fine water absorbing capacity, and its absorbability (60 minutes values) to ion exchange water under 4.83KPa pressure is not less than 50g/g, and it is better to be not less than 60g/g, and it is better to be not less than 70g/g.Should point out that the absorbability upper limit under the pressure can be without limits, and preferably have high value, consider manufacturing cost and other economic factor, the upper limit of absorbability is preferably 200g/g under the pressure, and 150g/g is better.
Therefore, the invention provides a kind of new-type particulate water absorbent containing, as follows.This particulate water absorbent containing is main component with the water-absorbing resin, and water-absorbing resin is the cross-linked polymer of water-soluble unsaturated monomer.Special and the particle size range its particle of water-absorbing resin shape is 106-850 μ m, and its quality accounts for 90% of the contained water-absorbing resin gross mass of particulate water absorbent containing.The absorbability of particulate water absorbent containing under pressure is not less than 50g/g when it is immersed in the water absorbing capacity that recorded in 60 minutes in the ion exchange water under 4.83KPa pressure.This particulate water absorbent containing is used the absorbability of ion exchange water is represented, performance is more superior than traditional absorptivity, and absorbability is strong especially when hyposaline concentration.The most handy salt concentration absorption index of particulate water absorbent containing of the present invention, salt tolerance index, average salt concentration absorption index and standard of tolerance and its feature of gel infiltration exponent specification.
[other additives]
Except the additive of the hand-deliver of tabulation when surface treatment coupling, can add other additive (to call " other additive " in the following text) on demand.The example of this other additive comprises: deodorant, antiseptic, aromatic substance, blowing agent, pigment, dyestuff, hydrophilic staple fibre, plasticizer, adhesive, surfactant, fertilization medium, oxidant, reducing agent, water, salt, chelating agent, disinfectant, hydrophilic polymer (as polyethylene glycol and polymine), hydrophobic polymer (as paraffin hydrocarbon), thermoplastic resin (as polyethylene and polypropylene), thermosetting resin (as mylar and Lauxite).These additives can add in adding step, give water-absorbing resin various performances.These additives are preferably in to add in the step and add the water-absorbing resin surface to.
The consumption of these additives is roughly 0-30% (quality) of 100% (quality) water-absorbing resin, and 0-10% (quality) is better, and 0-1% (quality) is better.
[application of water absorbing agent]
Particulate water absorbent containing of the present invention provides stable absorbability, no matter salt concentration how.This makes this particulate water absorbent containing can be applicable to a lot of fields, keeps product as the moisture of agricultural or horticulture, and industrial moisture maintenance product, remove to moisten agent or construction material at drier.But this water absorbing agent is particularly useful for the paper nappy to be the amenities of representative and to be used to absorb the body fluid sanitary napkin of (comprising ight soil, urine and blood).
Particulate water absorbent containing stable performance of the present invention and balance, this makes this particulate water absorbent containing can be applicable to highdensity hygienic absorption product, so-called density is water-absorbing resin weight and the ratio of water-absorbing resin and fibrous material gross weight, inserts density ratio definition by following formula (3), its value is 30-100% (quality), 40-100% (quality) is better, and 50-95% (quality) is better.
(inserts density ratio)=(particulate water absorbent containing quality)/(particulate water absorbent containing quality+mass of fibre material)
....(3)
Absorbing material (absorbing the composite of inserts and water absorbing agent) can be attached in the amenities with any form.For example, absorbing material can be a sandwich, and wherein water absorbing agent is placed between each sheet hydrophilic fibers material; Also can be the fusion structure, wherein water absorbing agent mixes with the hydrophilic fibers material.
[embodiment]
Following with reference to embodiment and Comparative Examples detailed description the present invention.But should recognize fully that the present invention is only limited to following special shape.In addition, as term used herein, " umber " refers to " umber of quality (weight) ", except as otherwise noted.
Notice that except as otherwise noted, all measurements are to be 25 ℃ ± 1 ℃ in atmospheric temperature and fluid temperature, under atmospheric pressure, relative humidity is less than carrying out under 50% the condition.
In addition, when doing the measurement of water absorbing agent or the above-mentioned coefficient of water-absorbing resin (explanation later on), the water absorbing agent of use or water-absorbing resin all are not do any improvement to handle.But when water absorbing agent or the excessive moisture of water-absorbing resin absorption, be that water absorbing agent or water-absorbing resin are taken from such as the such absorbent item of diaper, then will measure after finishing following steps: water absorbing agent or water-absorbing resin are for example under low pressure suitably dry to be handled again, make it for example constant quality arranged under 60 ℃, its water content is adjusted to and is not more than 7 ± 1% (quality), preferably be not more than 5 ± 1%＜＜＜preparation of solution 〉
In order to assess the absorbent properties of water absorbing agent or water-absorbing resin (particulate water absorbent containing), the present invention has used the NaCl aqueous solution that ion exchange water and salt concentration do not wait.
-solution S
0: ion exchange water
-solution S
1: the aqueous solution of 0.10% quality (weight) NaCl
-solution S
2: the aqueous solution of 0.20% quality (weight) NaCl
-solution S
3: the aqueous solution of 0.30% quality (weight) NaCl
-solution S
4: the aqueous solution of 0.40% quality (weight) NaCl
-solution S
5: the aqueous solution of 0.50% quality (weight) NaCl
-solution S
6: the aqueous solution of 0.70% quality (weight) NaCl
-solution S
7: the aqueous solution of 0.90% quality (weight) NaCl
＜water absorbing capacity (60 minutes absorbabilities (GV, gel volume) of no pressure) 〉
The water-absorbing resin (or water absorbing agent) of 0.20g is distributed on nonwoven fabric belts, and (in the 60mm * 60mm), cloth bag is immersed in S
0To S
7Every kind of excessive (100g at least) solution in.After 60 minutes, take out cloth bag, with 250G acceleration running 3 minutes, remove the water in the cloth bag, measure the heavy W2 (g) of bag with the ion isolation machine.
Notice that when the swelling coefficient of water-absorbing resin (or water absorbing agent) is bigger, when cloth bag weight W 2 (g) were greater than 15 (g) simultaneously, the dosage of water-absorbing resin (or water absorbing agent) can suitably be adjusted to and be not more than 0.20g in the bag.Specifically, to solution S
0-S
3, the dosage of water-absorbing resin (or water absorbing agent) is transferred to 0.01-0.05g.Equally, solution S
4, S
5Dosage be 0.05-0.15g, solution S
6, S
7Dosage be transferred to 0.10-0.20g.By this way, the heavy W2 of bag (g) is adjusted in 5-15 (g) scope.
The empty bag that does not contain water absorbing agent or water-absorbing resin is also done like this, and measures the weight W 1 (g) of empty bag.Then, separate following formula (4), with the weight W that records
1And W
2Obtain absorbability (g/g):
Absorbability under the＜pressure (AAP) 〉
Stainless steel 400 purpose standard filter screens (size of mesh 38 μ m) are attached to the plastic support cylinder bottom face of internal diameter 60mm, evenly spray water-absorbing resin or the water absorbing agent of 0.9000g on filter screen.Piston external diameter is slightly less than 60mm, is finish-machined to seamlessly to be assembled in the shoring, but can be as freely moving both vertically in cylinder.Piston is adjusted to the power that can evenly apply 4.83KPa (0.7psi) on water-absorbing resin or water absorbing agent.The following order of magnitude of piston and load is added on water-absorbing resin or the water absorbing agent, measures the gross mass Wa (g) of time measurement mechanism.Then, the glass filter of a diameter 90mm (is produced by Japanese Sougo RikagaKu Garasu SeisaKusho Co., Ltd; Aperture 100-120 μ m) be placed on the having in the cover glass dish of diameter 150mm, add every kind of solution to glass filter end face level.
The filter paper of a diameter 90mm (ADANTEC Toyo Kaisha Ltd makes, trade name: (qualitative filter paper, JSP P 3801, NO.2), thick 0.26mm, minimum-value aperture 5 μ m) put into glass filter), thereby complete wetting filter paper, and absorb too much solution.
Subsequently survey tool is placed on the wet filter paper, under pressure, absorbs the solution of contact.After 1 hour, mention survey tool, measure the weight W of survey tool
b(g), the W that records
aAnd W
bValue is used the absorbability (g/g) under following formula (5) calculating pressure:
＜salt concentration absorption index 〉
Salt concentration absorption index of the present invention has pressure or does not have the solution (S that depresses according to what record
0, S
1-S
7) water absorbing capacity calculate:
" absorbability under the pressure " is that water-absorbing resin or water absorbing agent soak the absorbability under 4.83KPa pressure in the time of 60 minutes such as (contact) the salt concentration aqueous solution in the formula, and do not have the absorbability under the pressure 60 minutes the time in " absorbability under the no pressure " to be water-absorbing resin or water absorbing agent be immersed in salt concentration aqueous solution such as excessive.
The first salt concentration absorption index used herein is the brine strength absorption index when being the medium salt concentration aqueous solution of following formula (1) with the ion exchange water.Equally, the second salt concentration absorption index be with 0.10% (quality) NaCl aqueous solution be in the formula (1) wait the salt concentration aqueous solution time the salt concentration absorption index.The 3rd salt concentration absorption index be with 0.30% (quality) NaCl aqueous solution be in the formula (1) wait the salt concentration aqueous solution time the salt concentration absorption index.The 4th salt concentration absorption index be with 0.50% (quality) NaCl aqueous solution be in the formula (1) wait the salt concentration aqueous solution time the salt concentration absorption index.The 5th salt concentration absorption index be with 0.70% (quality) NaCl aqueous solution be in the formula (1) wait the salt concentration aqueous solution time the salt concentration absorption index.The 6th salt concentration absorption index be with 0.90% (quality) NaCl aqueous solution be in the formula (1) wait the salt concentration aqueous solution time the salt concentration absorption index.
＜salt tolerance index 〉
According to the absorbability under the no pressure that records, available following formula (2) is obtained salt tolerance index.
" absorbability under the no pressure " is that water-absorbing resin or water absorbing agent soak the absorbability of the salt concentration aqueous solution in the time of 60 minutes such as (contacts) in the formula.At this, first salt tolerance index is the salt tolerance index when being the medium salt concentration aqueous solution of following formula (2) with 0.1% (quality) NaCl aqueous solution.
＜weight (quality) average grain diameter 〉
With the JIS standard filter screen screening water-absorbing resin or the water absorbing agent that comprise various size of meshes such as 850 μ m, 710 μ m, 600 μ m, 500 μ m, 425 μ m, 300 μ m, 212 μ m, 150 μ m, 106 μ m and 75 μ m, the percentage of remainder particulate is painted on the probability logarithmic paper with curve.This curve map is drawn weight average particle diameter (D50).
The water-absorbent resin powder of 10.00g or water absorbing agent put into (the IIDA testing sieve: internal diameter 80mm) its size of mesh comprises 850 μ m, 710 μ m, 600 μ m, 500 μ m, 425 μ m, 300 μ m, 212 μ m, 150 μ m, 106 μ m and 75 μ m on the JIS standard filter screen, and water-absorbent resin powder or water absorbing agent are made 10 minutes grading with the screen cloth agitating device (IidaSeisakusho Co., the ES-65 screen cloth agitating device that Ltd produces) of low outlet.Note, the term of Ying Yonging here, " weight average particle diameter (D50) " is the filter screen size, can take this to use screen cloth agitating device (United States Patent (USP) 5051259) and work 10 minutes, with the particle classification of water-absorbing resin or water absorbing agent particle gross weight 50%.
＜water-soluble amount (solvable amount) 〉
Weigh up 0.50% (quality) NaCl aqueous solution of 184.3g, be put in the 250ml plastic containers with cover.Then, in order to obtain solvable amount, 1.00g water-absorbing resin or water absorbing agent are added in this aqueous solution, the mixture of using for example magnetic stirrer (with 250-350rpm rotating speed) stirring to obtain again reaches 16 hours, the length of its stirring vane is 40mm, diameter be 8mm (as A type stirring vane, Sougo RiKagaKuGlass SeisaKusho Co., the Ltd product), the about deeply 2cm of consequent whirlpool.Extract with a filter paper filter (produce trade name by ADVANTEC Toyo Kaisha Ltd.: (qualitative filter paper, JISP3801, No.2), thick 0.26mm, minimum-value aperture 5 μ m), take out 50.0g filtrate as measuring solution.
Subsequently, to be titrated to pH value with the 0.1N NaOH aqueous solution be 10 to the saline solution that does not contain water-absorbing resin or water absorbing agent.Afterwards, to be titrated to pH value with the 0.1N HCL aqueous solution be 2.7 to saline solution.Titration can obtain blank titration degree ([bNaOH] mL, [bHCl] mL).
Can do same titration with measuring solution, obtain titer ([NaOH] mL, [HCl] mL).
After this, calculate the solvable amount of water-absorbing resin or water absorbing agent from the titer of blank titration degree and measurement solution.For example, for the water-absorbing resin or water absorbing agent that contain known quantity acrylic acid and salt thereof (PAA), the mean molecule quantity of available acrylic acid (PAA) monomer and above-mentioned titer are calculated solvable amount from following formula (6.1).
For the water-absorbing resin or water absorbing agent of content the unknown, obtain neutralization ratio with the titer value of measuring according to following formula (6.2) earlier, calculate the mean molecule quantity of monomer.Calculate the solvable amount of water-absorbing resin or water absorbing agent with following formula (6.1) with the mean molecule quantity of calculating like this.
The Performance Evaluation of＜absorbent item (utilizes little chubby child's doll Kewpie
Test 〉
Produce the suction articles for use that are used for Performance Evaluation by the following method.At first, general＜example〉and following＜comparative example in the water-absorbing resin (water absorbing agent) of 50 parts (weight) obtaining do dried the mixing with the comminuted wood pulp of 50 parts of weight with mixer.This mixture is pressed into 120mm * 400mm thin plate with fed batch formula air molding press on 400 order wire screens (size of mesh 38 μ m).2kg/cm subsequently pressurizes on this thin plate
2(196.14KPa) 5 seconds.The result obtains the about 0.047g/cm of basis weight
2Absorbing material.
Then, will be with the base plate that the part rivel is arranged (waterproof plate) of impermeability polypropylene manufacturing, absorbing material, and it is superimposed with double-sided tape to press this order by the top board (porous disc) that the polypropylene of porous is made, connect adhesive tape with two subsequently and be attached on this superimposed material, form absorbent item (being paper nappy).
This absorbent item is covered at Kewpie
On the doll (high 55cm, heavy 5kg), and with Kewpie
Face and transfer.Subsequently, at absorbent item and Kewpie
A middle pipe, the solution (S0-S7) deliver to the zone that expectation can be run into urine of inserting by this pipe.At this moment, sent into 50ml every 20 minutes after solution is heated to 37 ℃, deliver to always that absorbent item can not absorb again and spillage solution till, measure the solution total amount of sending into up to now.
Every kind of solution weight repetition measurement of S0-S7 four times is obtained four measured values and is got mean value, and this mean value be can be regarded as solution (value of being absorbed (QP uptake (g)) of S0-S7).Believe in the assessment that uptake is big more, the absorbent item performance is good more.
After the solution supply, seal with adhesive tape on absorbent item four limits, with the excision of absorbent item top layer, so can watch absorbent item from supply solution one side, then, in order to obtain diffusivity (%), measures a part of absorbing material of absorbent solution from supply side.The calculating of diffusivity (%) is that area that absorbing material had been used is divided by the absorbing material gross area.
As mentioned above, measure 4 solution total amounts and calculate the QP uptake.Therefore, obtain the diffusivity (%) of each measurement, with the mean value of 4 diffusivitys (%) QP diffusivity (%) as every kind of solution of S0-S7.It is believed that in the assessment that the QP diffusivity is high more, the absorbent item performance is good more.
＜gel infiltration index/GPI 〉
Use international disclosed WO9522356 (corresponding to the saline solution water conservancy diversion experimental provision of explanation in the day patent publication No. 509591/1977 of the present disclosure (ToKuhyouhei 9-509591), and with ion exchange water and S0-S7NaCl aqueous solution as swelling solution and percolating solution, obtain gel infiltration index (GPI).
At length, measurement mechanism shown in Figure 1 can be used for measuring GPI.This measurement mechanism comprises: dress percolating solution 33 in the container 31; Groove 41, solution are supplied with the gel layer of being made up of the water-absorbing resin of swelling or water absorbing agent 44 therein; Gatherer 48 is used to collect the solution that passes gel; Reach table scale 49, be used for the weight of the solution of measurement collection.
Insert a glass tube 32 in the container 31.The position of the lower end of glass tube 32 makes the penetrating fluid of supplying with groove 41 remain on the above 5cm in gel layer bottom surface.Penetrating fluid in the container 31 is supplied with groove 41 by the L type pipe that valve 35 is housed.
Groove 41 is reservoirs, and penetrating fluid sees through therein and comprises the water-absorbing resin of swelling or the gel layer 44 of water absorbing agent.The internal diameter 6cm of groove 41 has a stainless steel cloth 42 (400 orders, mesh size 38 μ m) in groove 41 bottom surfaces.Groove 41 also comprises a piston 46, can press to the surface of gel layer 44.Piston 46 has some holes of passing its lower part 47.The size in hole 47 can be passed through penetrating fluid.The lower part of piston 46 has glass filter 45, and its outstanding permeability can prevent water-absorbing resin or water absorbing agent, or its swelling gel enters in the hole 47.Groove 41 rests on the pallet.Pallet contacts with groove and comprises stainless wire mesh 43, and therefore, percolating solution can freely pass through pallet.
Collection container 48 is for collecting the percolating solution usefulness, is held in place on the platform balance 49 of woven wire 43 belows of support slot 41.This platform balance is measured the weight of the penetrating fluid of being collected by collection container 48.
Measurement mechanism is measured the method for GPI and is stated as follows.Filling water-absorbing resin or water absorbing agent (0.900g) are to the neat face height of groove 41.In groove 41, water-absorbing resin or water absorbing agent are with swelling liquid swelling 60 minutes under 0.3psi (2.07KPa) or 0.7psi (4.83KPa) predetermined pressure.Then, the height of record gel layer 44, gel layer is the water-absorbing resin or the water absorbing agent of swelling and gel.After this, penetrating fluid under the constant hydrostatic pressure from container drain and under same pressure swelling, thereby penetrate gel layer 44.Notice that the swelling liquid that penetrating fluid used herein and swelling are used is same solution.For example, when with SO solution swelling, just with SO solution as penetrating fluid.
Secondly, the total amount (g) of the penetrating fluid by gel layer 44 curve (Fig. 1) that write down once and drew in time in per 20 seconds in the clock time at 10 minutes with computer and platform balance.Penetrating fluid by gel layer 44 (most of penetrating fluid between blob of viscose by gel layer 44), its flow rate Fs (t) be to pass through the weight (g) of penetrating fluid of gel layer 44 in the given time divided by this scheduled time (s) (g/s).
Gel infiltration index (GPI) calculates with following formula (7), a data (flow rate Fs (t)) that the percolating solution total amount that needs utilization to write down in the clock time at 10 minutes obtains.In 10 fens clock times that begin from ts, hydrostatic pressure will be stablized, thereby obtains stable flow rate.
In the formula (7), the evaluation of the primary rate Fs (t=0) of expression by gel layer 44, the curve of the flow rate of can drawing Fs (t) and time t (behind the ts in 10 minutes) and with least square method with curve extrapolation, the value when obtaining t=0.In the formula (7), L
0Be gel layer thickness (cm), ρ is NaCl solution density (g/cm
3), A is gel layer top surface area (28.27cm in the groove 41
2), Δ P is the hydrostatic pressure (4920dyne/cm that acts on the gel layer
2).The unit of GPI is 10
-7* cm
3* S * g
-1
＜reference example 1 〉
The preparation of solution (1) is that the polyethyleneglycol diacrylate of 14.6g (add oxirane average mol be 8) is dissolved in the PAA aqueous solution of 4500g (39% weight list bulk concentration), through caustic soda and the acrylic acid that includes the protoanemonin that can not survey (ND) amount (less than 1ppm) and the p methoxy phenol (with respect to acrylic acid weight) of furfural and 50ppm) the neutralization ratio of the mixed liquor PAA aqueous solution one glass neutralize 71.3% (mole).
Solution (1) deoxygenation 30 minutes in nitrogen atmosphere enters reactor again, and reactor is the double-arm kneader of 10L stainless steel of two sigma type paddles and a chuck to be arranged and be added with lid.With the original air of nitrogen replacement, the temperature that keeps solution (1) simultaneously is 30 ℃ in the reflecting device.In addition, the aqueous solution and the stirring that add 2.46g sodium peroxydisulfate and 0.10g L-ascorbic acid in the solution (1).Begin polymerisation after about one minute, under 30-90 ℃, reacted 60 minutes, produce hydrogel cross-linked polymer (1).
Hydrogel cross-linked polymer (1) diameter that obtains is about 5mm..Several pieces hydrogel cross-linked polymers (1) are sprayed at (aperture 300 μ m) on the 50 purpose screen clothes, and use 150 ℃ of hot air dries 90 minutes thereon.Hydrogel cross-linked polymer (1) after the oven dry is pulverized with the oscillatory type grater and is classified and blending by 20 eye mesh screens (aperture 850 μ m).Its product is water absorbing resin particle in irregular shape (a).
＜reference example 2 〉
The preparation of solution (2) is that the polyethyleneglycol diacrylate of 11.7g (add oxirane average mol be 8) is dissolved in the PAA aqueous solution of 5200g (39% weight list bulk concentration), and this aqueous solution is by caustic soda and the acrylic acid of the protoanemonin that includes immeasurability (less than 1ppm) and the p methoxy phenol of furfural and 50ppm (with respect to acrylic acid weight)) mix that to reach neutralization ratio be 60.0% (mole).
Solution (2) is followed deoxygenation and is filled in the reactor, and reflecting device adds lid on the double-arm kneader of 10L stainless steel (two sigma type paddles and a chuck are arranged), and example 1 sees reference.With the gas in the nitrogen replacement reflecting device and keep 30 ℃ temperature.After this, the aqueous solution and the stirring that add 2.88g sodium peroxydisulfate and 0.10g L-ascorbic acid in the solution (2).Begin polymerisation after about one minute, carried out 60 minutes under being reflected at 30-90 ℃, produce hydrogel cross-linked polymer (2) (being diameter 5mm particle).Product is pressed reference example 1 described oven dry.
After the oven dry, hydrogel cross-linked polymer (2) is pulverized with the oscillatory type grater and is classified and blending by 20 eye mesh screens (aperture 850 μ m).Product is water absorbing resin particle in irregular shape (b).
＜reference example 3 〉
The preparation of solution (3) is that the polyethyleneglycol diacrylate of 58.5g (add oxirane average mol be 8) is dissolved in the aqueous solution of PAA (monomer density (weight) is 37%) of 5650g, this aqueous solution by with caustic soda with in the neutralization ratio that mixes neutralize 75.0% (mole) of the p methoxy phenol (with respect to acrylic acid weight) of the acrylic acid that contains protoanemonin that measurement do not go out and furfural and 50ppm is arranged.
In the injecting reactor, reflecting device adds lid and forms on the double-arm kneader of 10L stainless steel (two sigma type paddles and a chuck are housed), of reference example 1,2 after solution (3) deoxygenation.With in the nitrogen replacement reflecting device and keep 30 ℃ temperature.After this, add 2.88g sodium peroxydisulfate and 0.10g L-ascorbic acid in the solution (3), stir simultaneously.Begin polymerisation after about one minute, carried out 60 minutes under being reflected at 30-90 ℃, obtain hydrogel cross-linked polymer (3) (being diameter 5mm particle).Product is pressed reference example 1 and 2 described oven dry.
After the oven dry, hydrogel cross-linked polymer (3) is pulverized with the oscillatory type grater and is classified and blending by 20 eye mesh screens (aperture 850 μ m).Product is water absorbing resin particle in irregular shape (c).
＜reference example 4 〉
The preparation of solution (4) is that the polyethyleneglycol diacrylate of 4.4g (the oxirane average mol of interpolation is 8) is dissolved in the aqueous solution of PAA (monomer concentration is 33% weight) of 5330g, and this aqueous solution is by with the p methoxy phenol (with respect to acrylic acid weight) of caustic soda with acrylic acid that contains immeasurability protoanemonin and furfural and 50ppm) the neutralization ratio that mixes neutralize 75.0% (mole).
In solution (4) deoxygenation and the injecting reactor, reflecting device is added a cover on the double-arm kneader of 10L stainless steel (two sigma type paddles and a chuck are arranged) and formed, and is of reference example 1,2 and 3.In the nitrogen replacement reflecting device, keep 30 ℃ of temperature.After this, in solution (4), add the aqueous solution of 2.88g sodium peroxydisulfate and 0.10g L-ascorbic acid, stir simultaneously.Begin polymerisation after about one minute, carried out 60 minutes under being reflected at 30-90 ℃, obtain hydrogel cross-linked polymer (4) (being diameter 5mm droplet).Product is pressed reference example 1,2,3 oven dry.
After the oven dry, hydrogel cross-linked polymer (4) is pulverized with the oscillatory type grater and is classified and blending by 20 eye mesh screens (aperture 850 μ m).Product is water absorbing resin particle in irregular shape (d).
＜reference example 5 〉
The preparation of solution (5) is that the polyethyleneglycol diacrylate of 63.0g (the oxirane average mol of interpolation is 8) is dissolved in the aqueous solution (monomer concentration 37% weight) of the PAA of 5650g, this aqueous solution is by mixing the neutralization ratio of neutralize 60.0% (mole) with caustic soda with the p methoxy phenol (with respect to acrylic acid weight) of acrylic acid that contains a small amount of protoanemonin and furfural and 50ppm.
Solution (5) is pressed reference example 1-4 deoxygenation, and in the injecting reactor, reflecting device is described with reference example 1-4 to be to add lid on the double-arm kneader of a 10L stainless steel (two sigma type paddles and a chuck are arranged) to form, with the nitrogen replacement reflecting device inside of 30 ℃ of constant temperature.After this, in solution (5), add the aqueous solution of 2.88g sodium peroxydisulfate and 0.10g L-ascorbic acid, stir simultaneously.Begin polymerisation after about one minute, carried out 60 minutes under being reflected at 30-90 ℃, obtain hydrogel cross-linked polymer (5) (being diameter 5mm droplet), press the described oven dry of reference example 1-4.
After the oven dry, hydrogel cross-linked polymer (5) is pulverized with the oscillatory type grater and is classified and blending by 20 eye mesh screens (aperture 850 μ m).Product is water absorbing resin particle in irregular shape (e).
＜reference example 6 〉
Water absorbing resin particle in irregular shape (f) is pressed the method manufacturing of reference example 4, but uses the polyethyleneglycol diacrylate (the oxirane average mol of interpolation is 8) of 88.2g.
＜example 1 〉
100 parts of the water-absorbing resin that reference example 1 obtains (a) with contain 0.5 part of propane diols, 0.3 part 1, the surface crosslinking agent of 4-butanediol and 3 parts of water mixes mutually.This mixture is heated to 220 ℃ subsequently, is incubated 90 minutes, obtains comprising the water absorbing agent (1) of surface-treated water-absorbing resin.
＜example 2 〉
Press the method in the example 1, the water-absorbing resin (b) that obtains with reference example 2 replaces water-absorbing resin (a), obtains comprising the water absorbing agent (2) of surface-treated water-absorbing resin.
＜example 3 〉
At Le Dige the mixer ((Gebr of Le Dige Harmann Berstorff, Maschinenbau GmbH, Lodige Maschinenbau, GmbH) product, model M5R) inject 0.3 part the hydrophilic silicon dioxide (with respect to the quality of 100 parts of water-absorbing resins (c)) that is obtained by reference example 3 in, the water absorbing agent of generation has comprised the surface-treated water-absorbing resin in (3).
＜example 4 〉
Press the method in the example 3, replace hydrophilic silicon dioxide, obtain containing the water absorbing agent (4) of surface-treated water-absorbing resin with calcium stearate.
＜example 5 〉
The water-absorbing resin (e) that obtains with reference example 5 with comprise 0.5 part of propane diols, 0.3 part 1, the surface crosslinking agent of 4-butanediol and 3 parts of water mixes.This mixture is heated to 220 ℃ subsequently, is incubated 40 minutes, and the water absorbing agent that obtains (5) comprises the surface-treated water-absorbing resin.
＜example 6 〉
Press the method in the example 5, replace water-absorbing resin (e) with the water-absorbing resin (f) that obtains in the reference example 6, the water absorbing agent that obtains (6) comprises the surface-treated water-absorbing resin.
＜comparative example 1 〉
100 parts of water-absorbing resins that obtain by reference example 1 (a) with comprise 0.5 part of propane diols, 0.3 part 1, the surface crosslinking agent of 4-butanediol and 3 parts of water mixes mutually.This mixture is heated to 210 ℃ subsequently, is incubated 40 minutes, and the comparison water absorbing agent (1) that obtains has comprised the surface-treated water-absorbing resin.
＜comparative example 2 〉
100 parts of water-absorbing resins that obtain by reference example 4 (d) with comprise 0.02 part of ethylene glycol bisthioglycolate Synthesis of Oligo Ethylene Glycol, 0.3 part 1, the surface crosslinking agent of 4-butanediol, 0.4 part of propane diols and 2 parts of water mixes mutually.This mixture heats 195 ℃ subsequently, is incubated 50 minutes, and the comparison water absorbing agent (2) that obtains has comprised the surface-treated water-absorbing resin.
＜comparative example 3 〉
Except at 210 ℃ down the heating 40 minutes, the method for still pressing comparative example 3 obtains containing the comparison water absorbing agent (3) of surface-treated water-absorbing resin.
＜comparative example 4 〉
The water-absorbing resin (c) that is obtained by reference example 3 heated 90 minutes down at 220 ℃, did not mix with surface crosslinking agent, can obtain comparison water absorbing agent (4).
＜result 〉
Table 1 illustrates the various performances of water-absorbing resin (a)-(f), comprises to the absorbability of 0.90% (weight) NaCl aqueous solution under no pressure solvable amount (percentage by weight (wt) %), and size distribution (weight wt%).Table 2 and 3 illustrates the absorbability under no pressure to solution S 0-S7, and wherein table 2 expression contains water absorbing agent (1)-(6) of surface-treated water-absorbing resin, and water absorbing agent (1)-(4) are compared in table 3 representative and supply water-absorbing resin (c) relatively.The absorbability (AAP) of table 4 to pressure table 7 illustrate, salt concentration absorption index, and the average and standard deviation of salt concentration absorption index.
Table 8 illustrates uses water absorbing agent (1) and (2) and the assessment result of the performance (QP uptake) of the water absorbing agent product of water absorbing agent (1), (2), (3) relatively.Water absorbing agent (1) and comparison water absorbing agent (3) were at two different pressures (gel infiltration index under 0.3psi (2.07Kpa) and the 0.7psi (4.83KPa) when table 9 illustrated employing solution S 6 (0.7% quality (weight) the NaCl aqueous solution).Table 10 illustrates and adopts solution S O, S3, S6, water absorbing agent during S7 (1) and the gel infiltration index of comparison water absorbing agent (3) under 0.3psi (2.07KPa).
Table 11 illustrates when adopting water absorbing agent (1) and comparing water absorbing agent (1), (3), the assessment result of water absorbing agent properties of product (QP absorption index).
Table 12 and 13 illustrates the salt tolerance index of water absorbing agent (1)-(6) that contain the surface treatment water-absorbing resin.Table 12 and 13 also illustrates comparison water absorbing agent (1)-(4), and for the salt tolerance index of relatively using water-absorbing resin (c).
Table 1
| Water-absorbing resin (a) | Water-absorbing resin (b) | Water-absorbing resin (c) | Water-absorbing resin (d) | Water-absorbing resin (e) | Water-absorbing resin (f) | |
| Absorbability under the no pressure (g/g) (the 0.9%NaCl aqueous solution) | 32.0 | 30.0 | 20.1 | 40.0 | 20.2 | 14.8 |
| Solvable amount (wt, %) | 10.0 | 9.0 | 2.0 | 12.0 | 1.8 | 0.9 |
| The size distribution 500 μ m of water-absorbing resin are qualified | 94 | 96 | 96 | 93 | 96 | 94 |
| 300 μ m are qualified | 24 | 26 | 26 | 25 | 26 | 24 |
| 150 μ m are qualified | 3 | 2 | 5 | 4 | 5 | 3 |
| 106 μ m are qualified | 1 | 1 | 2 | 3 | 2 | 1 |
| Quality mean particle size D 50 (μ m) | 350 | 340 | 340 | 350 | 340 | 350 |
Table 2
| Absorbability under the no pressure (g/g) | Water absorbing agent (1) | Water absorbing agent (2) | Water absorbing agent (3) | Water absorbing agent (4) | Water absorbing agent (5) | Water absorbing agent (6) |
| NaCl concentration (wt, %) 0.0 | 73.8 | 68.0 | 56.8 | 58.0 | 54.5 | 36.1 |
| 0.1 | 45.0 | 43.0 | 39.7 | 44.0 | 36.4 | 28.1 |
| 0.2 | 36.3 | 35.0 | 33.5 | 38.0 | 30.3 | 23.2 |
| 0.3 | 30.9 | 29.0 | 31.6 | 33.0 | 26.0 | 21.0 |
| 0.4 | 24.7 | 24.0 | 29.8 | 30.0 | 24.5 | 19.0 |
| 0.5 | 23.2 | 22.0 | 27.1 | 27.0 | 22.5 | 17.0 |
| 0.7 | 20.1 | 19.0 | 24.0 | 24.0 | 20.0 | 14.5 |
| 0.9 | 18.0 | 17.0 | 20.1 | 20.0 | 18.1 | 13.5 |
| (wt, %) 500 μ m are qualified for the water-absorbing resin size distribution | 95 | 96 | 95 | 93 | 93 | 93 |
| 300 μ m are qualified | 24 | 26 | 25 | 25 | 25 | 25 |
| 150 μ m are qualified | 2 | 3 | 4 | 4 | 4 | 4 |
| 106 μ m are qualified | 1 | 1 | 3 | 3 | 3 | 3 |
| Particle mean size | 350 | 340 | 350 | 350 | 350 | 350 |
Table 3
| Absorbability under the no pressure (g/g) | Compare water absorbing agent (1) | Compare water absorbing agent (2) | Compare water absorbing agent (3) | Compare water absorbing agent (4) | Water-absorbing resin (c) |
| NaCl concentration (wt, %) 0.0 | 130.2 | 281.6 | 207.5 | 55.9 | 61.9 |
| 0.1 | 56.4 | 111 | 82.4 | 43.2 | 44.2 |
| 0.2 | 45.7 | 87.3 | 63.5 | 36.7 | 37.7 |
| 0.3 | 38.7 | 69.6 | 56.3 | 33.1 | 32.9 |
| 0.4 | 34.8 | 62 | 50.1 | 28.7 | 29.7 |
| 0.5 | 32.8 | 57.8 | 45.0 | 27.8 | 26.4 |
| 0.7 | 28.1 | 51.8 | 38.6 | 24.6 | 22.3 |
| 0.9 | 28 | 47.7 | 32.0 | 21.1 | 20.1 |
| (wt, %) 500 μ m are qualified for the water-absorbing resin size distribution | 95 | 93 | 97 | 96 | 96 |
| 300 μ m are qualified | 24 | 26 | 25 | 26 | 26 |
| 150 μ m are qualified | 3 | 4 | 4 | 5 | 5 |
| 106 μ m are qualified | 2 | 2 | 3 | 3 | 2 |
| Particle mean size | 350 | 350 | 340 | 340 | 340 |
Table 4
| Absorbability under the pressure (g/g) | Water absorbing agent (1) | Water absorbing agent (2) | Water absorbing agent (3) | Water absorbing agent (4) | Water absorbing agent (5) | Water absorbing agent (6) |
| NaCl concentration (wt, %) 0.0 | 71.7 | 70.0 | 46.7 | 51.0 | 59.3 | 42.8 |
| 0.1 | 40.6 | 42.0 | 36.4 | 38.0 | 35.3 | 29.4 |
| 0.2 | 32.4 | 33.0 | 29.4 | 30.0 | 29.6 | 25.8 |
| 0.3 | 28.5 | 30.0 | 27.7 | 29.0 | 26.0 | 22.0 |
| 0.4 | 25.4 | 25.8 | 24.7 | 25.2 | 23.5 | 21.0 |
| 0.5 | 23.9 | 24.0 | 23.8 | 24.1 | 23.2 | 20.6 |
| 0.7 | 21.5 | 22.0 | 21.3 | 21.4 | 19.8 | 18.3 |
| 0.9 | 18.6 | 19.0 | 18.0 | 18.3 | 19.3 | 17.8 |
Table 5
| Absorbability under the pressure (g/g) | Compare water absorbing agent (1) | Compare water absorbing agent (2) | Compare water absorbing agent (3) | Compare water absorbing agent (4) | Water-absorbing resin (c) |
| NaCl concentration (wt, %) 0.0 | 66.4 | 12.1 | 39.8 | 31.5 | 19.1 |
| 0.1 | 45.2 | 10.3 | 43.9 | 24.1 | 23.9 |
| 0.2 | 37.7 | 9.4 | 38.0 | 20.5 | 19.8 |
| 0.3 | 33.2 | 9.4 | 33.2 | 20.9 | 19.2 |
| 0.4 | 30.9 | 8.6 | 29.0 | 20.4 | 18.1 |
| 0.5 | 28.7 | 8.4 | 28.3 | 20.7 | 17.0 |
| 0.7 | 25.8 | 8.3 | 26.1 | 18.1 | 17.0 |
| 0.9 | 24.0 | 7.6 | 25.0 | 18.3 | 17.0 |
Table 6
| The salt concentration absorption index | Water absorbing agent (1) | Water absorbing agent (2) | Water absorbing agent (3) | Water absorbing agent (4) | Water absorbing agent (5) | Water absorbing agent (6) |
| NaCl concentration (wt, %) 0.0 | 0.97 | 1.03 | 0.82 | 0.88 | 1.09 | 1.19 |
| 0.1 | 0.90 | 0.98 | 0.92 | 0.86 | 0.97 | 1.05 |
| 0.2 | 0.89 | 0.94 | 0.88 | 0.79 | 0.98 | 1.11 |
| 0.3 | 0.92 | 1.03 | 0.88 | 0.88 | 1.00 | 1.05 |
| 0.4 | 1.03 | 1.08 | 0.83 | 0.84 | 0.96 | 1.11 |
| 0.5 | 1.03 | 1.09 | 0.88 | 0.89 | 1.03 | 1.21 |
| 0.7 | 1.07 | 1.16 | 0.89 | 0.89 | 0.99 | 1.26 |
| 0.9 | 1.03 | 1.12 | 0.90 | 0.92 | 1.07 | 1.32 |
| The mean value of salt concentration absorption index | 0.98 | 1.05 | 0.87 | 0.87 | 1.01 | 1.16 |
| The standard deviation of salt concentration absorption index | 0.0041 | 0.0045 | 0.0009 | 0.0013 | 0.0477 | 0.0776 |
Table 7
| The salt concentration absorption index | Compare water absorbing agent (1) | Compare water absorbing agent (2) | Compare water absorbing agent (3) | Compare water absorbing agent (4) | Water-absorbing resin (c) |
| NaCl concentration (wt, %) 0.0 | 0.51 | 0.04 | 0.19 | 0.56 | 0.31 |
| 0.1 | 0.80 | 0.09 | 0.53 | 0.56 | 0.54 |
| 0.2 | 0.82 | 0.11 | 0.60 | 0.56 | 0.53 |
| 0.3 | 0.86 | 0.14 | 0.59 | 0.63 | 0.58 |
| 0.4 | 0.89 | 0.14 | 0.58 | 0.71 | 0.61 |
| 0.5 | 0.88 | 0.15 | 0.63 | 0.74 | 0.64 |
| 0.7 | 0.92 | 0.16 | 0.68 | 0.74 | 0.76 |
| 0.9 | 0.86 | 0.16 | 0.78 | 0.87 | 0.85 |
| The mean value of salt concentration absorption index | 0.82 | 0.12 | 0.57 | 0.67 | 0.60 |
| The standard deviation of salt concentration absorption index | 0.0146 | 0.0014 | 0.0256 | 0.0110 | 0.0229 |
Table 8
Table 9
Table 10
Table 11
Table 12
| Salt tolerance index | Water absorbing agent (1) | Water absorbing agent (2) | Water absorbing agent (3) | Water absorbing agent (4) | Water absorbing agent (5) | Water absorbing agent (6) |
| NaCl concentration (wt, %) | ||||||
| 0.1 | 0.61 | 0.63 | 0.70 | 0.76 | 0.67 | 0.78 |
| 0.2 | 0.49 | 0.51 | 0.59 | 0.66 | 0.56 | 0.64 |
| 0.3 | 0.42 | 0.43 | 0.56 | 0.57 | 0.48 | 0.58 |
| 0.4 | 0.33 | 0.35 | 0.52 | 0.52 | 0.45 | 0.53 |
| 0.5 | 0.31 | 0.32 | 0.48 | 0.47 | 0.41 | 0.47 |
| 0.7 | 0.27 | 0.28 | 0.42 | 0.41 | 0.37 | 0.40 |
| 0.9 | 0.24 | 0.25 | 0.35 | 0.34 | 0.33 | 0.37 |
Table 13
| Salt tolerance index | Compare water absorbing agent (1) | Compare water absorbing agent (2) | Compare water absorbing agent (3) | Compare water absorbing agent (4) | Water-absorbing resin (c) |
| NaCl concentration (wt.%) | |||||
| 0.1 | 0.43 | 0.39 | 0.40 | 0.77 | 0.71 |
| 0.2 | 0.35 | 0.31 | 0.31 | 0.66 | 0.61 |
| 0.3 | 0.30 | 0.25 | 0.27 | 0.59 | 0.53 |
| 0.4 | 0.27 | 0.22 | 0.24 | 0.51 | 0.48 |
| 0.5 | 0.25 | 0.21 | 0.22 | 0.50 | 0.43 |
| 0.7 | 0.22 | 0.18 | 0.19 | 0.44 | 0.36 |
| 0.9 | 0.22 | 0.17 | 0.15 | 0.38 | 0.32 |
Above-mentioned the present invention obviously can have a lot of variations, and such variation can not be considered as departing from the spirit and scope of the invention, and all such variations it will be apparent to those skilled in the art that, should be included in the scope of claim of the present invention.
Industrial Applicability A
Why particulate water absorbent containing of the present invention has good performance regardless of service condition, thereby can be applicable to various fields, and such as the moisture maintenance of agricultural or gardening, industrial moisture keeps, drier, dehumidizer or construction material. Particulate water absorbent containing of the present invention is specially adapted to the amenities take paper nappy as representative and absorbs the sanitary napkin of body fluid (comprising ight soil, urine, blood).
Claims (18)
1. particulate water absorbent containing, its contained water-absorbing resin forms by water-soluble unsaturated monomer is crosslinked; The particle of water-absorbing resin is spherical or irregular particle shape and particles contained granularity are being not less than 106 μ m and less than the scope of 850 μ m, the particles contained quality of water-absorbing resin is no less than 90% of water-absorbing resin gross mass; Particulate water absorbent containing has the first salt concentration absorption index, and its value is calculated by following formula (1) and is not less than 0.60 when with the ion exchange water being the aqueous solution such as salt concentration such as grade:
The salt concentration absorption index=in the absorbability of the inferior salt concentration aqueous solution of 4.83KPa pressure
The absorbability of the inferior salt concentration aqueous solution of/no pressure ... formula (1)
Molecule is when the salt concentration aqueous solution such as particulate water absorbent containing immersion absorbability under 4.83KPa pressure after 60 minutes in the formula (1), and denominator is when the salt concentration aqueous solution such as particulate water absorbent containing immersion absorbability under the no pressure after 60 minutes;
After 60 minutes, the absorbability under no pressure is calculated as 10-27g/g by following formula (4) in particulate water absorbent containing immersion 0.90% (quality) NaCl aqueous solution:
The weight (g) of absorbability (g/g)=(weight W 2 (g)-weight W 1 (g))/water absorbing agent ... formula (4)
In the formula (4), W2 is that the water absorbing agent with 0.20g is distributed in the nonwoven fabric belts of 60mm * 60mm, and cloth bag was immersed in the above described NaCl aqueous solution of 100g after 60 minutes, took out cloth bag, with 250G acceleration running 3 minutes, the bag in the removal cloth bag behind the water was heavy with the ion isolation machine; W1 does not use water absorbing agent, carries out the weight of the bag after the same operation.
2. particulate water absorbent containing, its contained water-absorbing resin forms by water-soluble unsaturated monomer is crosslinked; The particle of water-absorbing resin is spherical or irregular particle shape and particles contained granularity are being not less than 106 μ m and less than the scope of 850 μ m,, the particles contained quality of water-absorbing resin is not less than 90% of water-absorbing resin gross mass;
This particulate water absorbent containing absorbability under 4.83KPa pressure after soaking 60 minutes with ion exchange water is not less than 50g/g;
After 60 minutes, the absorbability under no pressure is calculated as 10-27g/g by following formula (4) in particulate water absorbent containing immersion 0.90% (quality) NaCl aqueous solution:
The weight (g) of absorbability (g/g)=(weight W 2 (g)-weight W 1 (g))/water absorbing agent ... formula (4)
In the formula (4), W2 is that the water absorbing agent with 0.20g is distributed in the nonwoven fabric belts of 60mm * 60mm, and cloth bag was immersed in the above described NaCl aqueous solution of 100g at least after 60 minutes, took out cloth bag, with 250G acceleration running 3 minutes, the bag in the removal cloth bag behind the water was heavy with the ion isolation machine; W1 does not use water absorbing agent, carries out the weight of the bag after the same operation.
3. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing has the second salt concentration absorption index, when etc. the salinity aqueous solution when being 0.10% (quality) NaCl aqueous solution its value calculate with formula (1) and be not less than 0.80.
4. as claim 1 or 3 described particulate water absorbent containings, wherein, particulate water absorbent containing ought be respectively with 0.30%
(quality), 0.50% (quality), 0.70% (quality) and 0.90% (quality) NaCl aqueous solution its value when waiting salt concentration aqueous solution has the three, the four, the 5th and the 6th salt concentration absorption index by formula (1) calculating; And wherein, the three, four, five, six salt concentration absorption indexs have at least one to be not less than 0.90.
5. particulate water absorbent containing as claimed in claim 4, wherein, particulate water absorbent containing has with the first, the second, and the mean value of the three, four, five, six salt concentration absorption indexs is its average salt concentration absorption index, and its value is not less than 0.90.
6. particulate water absorbent containing as claimed in claim 5, wherein, the standard deviation of average salt concentration absorption index is 0-0.100.
7. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing has first salt tolerance index, and its value is calculated by following formula (2) and is not less than 0.40 when with 0.10% (quality) NaCl aqueous solution serving as the aqueous solution such as salt concentration such as grade:
The absorbability of salt tolerance index=inferior salt concentration aqueous solution of no pressure/
The absorbability of ion exchange water under the no pressure ... formula (2)
Molecule is the salt concentration aqueous solution such as particulate water absorbent containing immersion absorbability under the no pressure after 60 minutes in the formula (2), and denominator is particulate water absorbent containing immersion ion exchange water absorbability under the no pressure after 60 minutes.
8. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing soak 0.90% (quality) NaCl aqueous solution after 60 minutes the water absorbing capacity under 4.83KPa pressure be 10-27g/g.
9. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing also comprises water-fast particulate.
10. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing has the gel infiltration index, and it is not less than 15X10 to the value of ion exchange water under 2.07KPa pressure
-7* cm
3* s * g
-1
11. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing is not less than 50X10 for the gel infiltration index of 0.30% (quality) NaCl aqueous solution under 2.07KPa pressure
-7* cm
3* s * g
-1
12. particulate water absorbent containing as claimed in claim 1, wherein, particulate water absorbent containing is not less than 15X10 for the gel infiltration index of 0.70% (quality) NaCl aqueous solution under 4.83KPa pressure
-7* cm
3* s * g
-1
13. particulate water absorbent containing as claimed in claim 1, wherein, water-absorbing resin is by surface modification treatment.
14. particulate water absorbent containing as claimed in claim 13, wherein, surface modification treatment makes water-absorbing resin surface-crosslinked.
15. particulate water absorbent containing as claimed in claim 1, wherein, granular water-absorbent resin contains carboxyl.
16. the described particulate water absorbent containing of claim 1, wherein, water-soluble unsaturated monomer comprises acrylic acid and/or acrylates.
17. an amenities that is used to absorb body fluid, it comprises the particulate water absorbent containing of claim 1.
18. amenities as claimed in claim 17 also comprises absorbed layer, its sandwich layer density is being not less than 0.3 to the scope that is not more than 1.0 as calculating by following formula (3):
Sandwich layer density=particulate water absorbent containing quality/(particulate water absorbent containing quality+mass of fibre material) ... formula (3).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP032770/2003 | 2003-02-10 | ||
| JP2003032770 | 2003-02-10 | ||
| JP068579/2003 | 2003-03-13 |
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| Publication Number | Publication Date |
|---|---|
| CN1697690A CN1697690A (en) | 2005-11-16 |
| CN100482339C true CN100482339C (en) | 2009-04-29 |
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| CNB2004800001047A Expired - Lifetime CN100482339C (en) | 2003-02-10 | 2004-02-09 | Particulate water absorbent containing water absorbent resin as a main component |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007007203A1 (en) * | 2007-02-09 | 2008-08-14 | Evonik Stockhausen Gmbh | Water-absorbing polymer structure with high ammonia binding capacity |
| CN102844340B (en) * | 2010-02-08 | 2016-01-13 | Lg化学株式会社 | By the absorbent resin of cationic polymeric compounds surface modification |
| EP4252728A3 (en) * | 2013-12-20 | 2024-01-10 | Nippon Shokubai Co., Ltd. | Water absorbing agent based on polyacrylic acid and/or a salt thereof |
| CN110983753A (en) * | 2019-12-13 | 2020-04-10 | 江阴开源非织造布制品有限公司 | Antibacterial hydrophilic non-woven fabric modifier and preparation method thereof |
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