CN1208088A - Nonwoven fibrous superabsorbent product - Google Patents
Nonwoven fibrous superabsorbent product Download PDFInfo
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- CN1208088A CN1208088A CN98115545A CN98115545A CN1208088A CN 1208088 A CN1208088 A CN 1208088A CN 98115545 A CN98115545 A CN 98115545A CN 98115545 A CN98115545 A CN 98115545A CN 1208088 A CN1208088 A CN 1208088A
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Abstract
The invention provides an improved process for producing wet-type sedimentation ultra-absorption nonwoven web structure that shows beneficial combination of density, flexibility and absorption capacity and provides ultra-absorption nonwoven fabric products. The water process of the method adopts univalent metal mineral salt to decrease absorption capacity for the polymer components efficiently.
Description
The present invention relates to water-bearing media is had the production of high absorptive capacity, more specifically relate to the thin web frame in the wet shop that comprises the graininess super-absorbent polymer that can form aquogel.
Super-absorbent polymer (SAP) is the synthesizing cross-linked polymeric material that can absorb himself weight several times in water or other liquid.This material commercial be as additive, to increase the absorbability such as diaper, sanitary napkin, operation dress, disposable dustcloth etc., they also are the products of commercial Application.
Because super-absorbent polymer and product have worldwide obtained the patent more than 5000 since 1966, thereby proved the commercial significance of these polymer.Their great majority have had final application.Many research and development now continue at final application, are included in to absorb in the product fixedly SAP.
Because super-absorbent polymer is crosslinked, and do not form solution in solvent, they are the most normal with powdery and granular the operation.
When forming the nonwoven web structure, exist product design problem and health problem with the air lay method.Powdered super-absorbent polymer has the trend of agglomeration in the fibrous supporting substrate of nonwoven web structure, so just produce uneven absorptive capacity in web frame.
Powdered super-absorbent polymer is also faced health problem in air lay manufactured process.In manufacturing district, the superabsorbents powder that air carries can be sucked by the workman.The super-absorbent polymer that sucks absorbs liquid and swelling in respiratory tract, the result can produce respiratory tract and stop up and other health complications.
The other method of making nonwoven fibrous superabsorbent product is a wet shop method.Identical with the air lay method, with wet shop method incident problem when forming, fiber web is arranged also.
Wet by fiber and super-absorbent polymer the shop prior art method into the net in customary way be with ingredients suspension in water-bearing media so that it is delivered to sheet forming apparatus, such as the forming metal net.Fibrous aqueous dispersion often is referred to as feed.
Also there is other problem in the wet super-absorbent polymer that is paved in the net method aqueous medium.Super-absorbent polymer is tending towards swelling and toughness when being suspended in the aqueous medium.Also be easy to break under the high relatively shearing that super-absorbent polymer exists in the wet-laying process.The suspension system medium usually is difficult to take off liquid, and after this is difficult for dry.Finished product is tending towards hardening, can not rewetting arrive acceptable degree.
The nonwoven fibrous super absorption mesh with improved composite behaviour that is used for disposable absorbent products for developing effective ways production arouses attention always.
Therefore, the purpose of this invention is to provide an improved method to produce the wet nonwoven fibrous super absorption mesh structure of shop method.
Another object of the present invention provides density, flexibility and the absorptive capacity novel nonwoven fibrous superabsorbent product to existing sharp combination.
Other purpose of the present invention and advantage will become fairly obvious from drawings and Examples.
Background publication related to the present invention comprises EP437816 and United States Patent(USP) Nos. 4,354,901; 4,610,678; 4,986,882; 5,049,235; 5,137,600; 5,167,765; 5,453,323; And 5,531,728; Provide reference at this.
One or more purpose of the present invention is to finish with the method for following production nonwoven fibrous superabsorbent product, and this method comprises that (1) forms 0.1-1wt% and comprises that (a) average dawn number (denier) is the polymer fiber of 0.1-28, the about 0.3-15mm of average length and (b) the granular super-absorbent polymer of the formation aeroge of the about 0.1-1.0mm of the particle mean size (weight ratio of polymer fiber and granular super-absorbent polymer about 20: 80-80: the water slurry of group component 20); Wherein slurry has the solution content of about 0.12-7.50 mole monovalence inorganic metal salt, (2) form the thin web frame that takes off liquid by slurry, (3) dry network structure is to obtain superabsorbent product, and the moisture that this superabsorbent product has is lower than about 10wt%, total absorptive capacity of the every square metre of about 10-30 gram of the about 0.5-5mm of total basic weight, thickness, the every gram superabsorbent product less than about 80-400 gram water-bearing media and the ASTM stiffness of every square centimeter of about 1075-4500 milligram.
Aqueous slurry in this method can have the pH scope and be about 2-10, preferably about 3-8.
In another embodiment, nonwoven fibrous superabsorbent product provided by the invention is the thin web frame of a wet shop method, it comprise the polymer fiber of (a) the average about 0.1-28 of dawn number, about 0.3-15mm of average length and (b) the about 0.1-1.0mm of particle mean size granular can form the super-absorbent polymer of aquogel (weight ratio of polymer fiber and granular super-absorbent polymer is about 20: 80-80: 20); Wherein the water content of superabsorbent product is lower than about 10wt%, always basic weight is about every square metre of 80-400 gram, thick about 0.5-5mm, always absorptive capacity is that the about 10-30 gram of every gram superabsorbent product water-bearing media, ASTM stiffness are every square centimeter of about 1075-4500 milligram.
Total basic weight of superabsorbent product of the present invention can change in every square metre of about 50-700 gram scope, and preferred range is every square metre a 80-400 gram.
The fibroreticulate technology in wet shop is widely adopted in production nonwoven web structure, such as US5, and narration to some extent in 531,728 and so on the publication, the wet shop method that is fit to comprises manual lapping and utilizes the wet shop method (as US3, described in 301,746) of paper machine.Generally, wet lapping is that the fiber water slurry is deposited on the wire-mesh screen, and the shop de-watering of slurries that will wet forms wet net, and the net that will wet then is dry.
Suspended solids content in the water slurry is generally about 0.1-2wt%, based on total slurry re-computation.
The available equipment that is referred to as high-order stuff box of the deposition of slurry is finished.High-order stuff box has an opening in order to the fiber water slurry is transported on the wire-mesh screen.Wire-mesh screen often is called as forming web (forming wire).Forming web can be useful on used structure and mesh size in dry type pressing plate (dry lap) and other papermaking processing.Preferred about 100 (the Tyler standard screen degree) of the about 70-of mesh size that use.
After forming net, the net dehydration and dry of will wetting.The fair case of the available suction of dewatering or other vacuum plant carry out.After the dehydration net is moved on the dry fabric from forming web, it is transported to drying device with net.
A dry available hot blast drying machine or the vacuum equipment such as inhaling fair case are finished.The water content of web frame is reduced to below about 10wt%, below preferably about 5wt%.
The average dawn number of the employed fiber of nonwoven superabsorbent product of the present invention is about 0.1-28 (the about 0.5-3 of preferable range), the about 0.3-15mm of average length.The kind that can provide and be fit to mix the very wide organic and inorganic fibers of a scope of nonwoven superabsorbent product is provided the particular type of fiber.
The example of organic polymer fiber is cellulose acetate, artificial fibre, the polyester fiber such as polyethylene terephthalate, polyvinyl fluoride, polyvinylidene chloride, esters of acrylic acid, polyvinyl acetate, polyamide, two component fibres, tricomponent fibre and composition thereof, and other fiber.As US4,483,743 and US4, the high surface area fiber of expansion fibrillation cellulose fibre described in 761,203 and so on also is fit to.The example of inorfil is glass, pottery, wollastonite etc.
The super-absorbent polymer that can form aquogel that adopts in nonwoven superabsorbent product of the present invention generally has the on average about 0.1-1.0mm of original particle size.
The example of super-absorbent polymer be derived from the crosslinked polymer of vinyl monomer of multifunctional reactant.Other kind of super-absorbent polymer has polyacrylic acid and the hydrolyzed polyacrylonitrile and their alkali metal salt of starch conversion.
Super-absorbent polymer is narration to some extent in the literature, such as U.S. Patent number: 3,661,815; 3,669,103; 3,889,768; 4,076,663; 4,286,082; 4,959,061; 4,986,882; 4,990,541; 5,098,951; 5,145,906; 5,443,899, provide reference at this.
The super-absorbent polymer that registration mark is arranged that commerce provides comprise SANWET 1M-4500 and IM-4510 (Hoechst Celanese Corp., Charlotte, N, C.); DRYTECH520 (Dow Chem.Co., Midland, Mich.); AQUA KEEP (Seitetsu KagakuCo., Ltd.); ARASORB (Arakawa Chemical Co.); ARIDALL1125 (Chemical Corporation); And FAVOR (Stockhausen, Inc).
Prepare in the method for nonwoven fibrous superabsorbent product in the present invention, its main aspect is to include the inorganic salts that an aqueous solution content is about the monovalence metal of 0.12-7.50 mole, its illustrative examples is an alkali halide, such as sodium chloride, sodium bromide, potassium chloride and potassium bromide.Preferred salinity is about the 0.22-2.50 mole.Water-soluble multivalent metal salt such as calcium chloride is less-than-ideal, because it can make polymer fiber and super absorbing particle form complex and suppress cancellated super absorptive capacity.
It is important that the existing in of monovalence metal organic salt plays a part to do in the method for wet shop.It suppresses the swelling of super-absorbent polymer in the initial water slurry stage.The swelling of the super-absorbent polymer in the slurry stage can make the process failure and/or form unacceptable web frame and/or require excessive drying time, proves as embodiment.
Another method that suppresses water slurry super-absorbent polymer swelling in the stage be temperature maintenance with water slurry at about 0-25 ℃, preferably about 0-10 ℃.
The inventive method can comprise optionally that a net width of cloth pressurization steps is to increase the density of nonwoven fibrous superabsorbent product.The density of superabsorbent product is preferably in about 0.02-0.07 gram/cubic centimetre scope.
The TENSILE STRENGTH of superabsorbent product of the present invention can change in about 0.3-2 pound fracture load scope.Superabsorbent product of the present invention has the best incorporated of intensity, flexibility and absorptive capacity.
The following examples are to further specify of the present invention.Its component and concrete ingredient all are typical, and various modifications can be come from disclosed content, all within the scope of the invention.
A
The mensuration of the stiffness of superabsorbent product is by ASTM D1388-64
B
The stretching strength determination of superabsorbent product sample (1 * 5 inch) is to use the Syntech instrument, uses following condition:
3 inches of gauge lengths
Initial velocity 3 inch per minute clocks
Second speed 3 inch per minute clocks
TENSILE STRENGTH is recorded as peak load (peak load before the fracture) poundage.
C
The absorptive capacity of superabsorbent product the load under by following step measurements.
Round mouth die-cutting machine with 2 inch diameters cuts 6 samples from super absorbent sheet, and with stove dry 2 hours.
With 10 gram sodium chloride and 1 liter of salting liquid of deionized water preparation.
Sample is fixed in the specimen holder, places a weight (0.5psi) on each sample.In dish, add 1.0% salting liquid (73.4 ≠ 2) of measured quantity and each sample is placed salting liquid.
After the imbibition 10 minutes, from dish, take out sample, remove load.Write down the salting liquid weight of each absorption of sample.Absorb the mean value calculation of weight with 6 samples.
The embodiment I
This example explanation adopts conventional wet shop legal system to be equipped with nonwoven fibrous superabsorbent product.
With cellulose acetate fibre (1.5 grams, 1.8 dawn/monofilament * 6.35mm), super-absorbent polymer (1.5 grams, SANWET 1M-4510; Hoechst CeleaneseCorp.) and water (20 ℃, 737 gram) in 1 liter Waring laboratory blender, mixed for 15 seconds.The pH of slurry mixture is about 6, has gel to form in about 2 minutes.The mixture impouring is filled in the high-order condiment case of 18 liters of laboratory scales of 12 premium on currency (20 ℃), after mixing by hand water is emitted.The total time that this process experienced is about 3 minutes.Preformed web frame is taken off liquid.Prolong the handmade paper accepted that dry period can not obtain testing usefulness.
The embodiment II
This example explanation prepares nonwoven fibrous superabsorbent product with the inventive method.
Step by the embodiment I is carried out, but the employing salting liquid (20 ℃, 737 grams; 5wt%NaCl) and the net preformed objects of taking off liquid wash with water to remove salt.
Finished product with the inventive method has following specification:
Water content 1.98%
Total basic weight 275 grams/square metre
Thickness 4.2mm (standard error 0.222mm)
2039.2 milligrams/square centimeter of ASTM stiffnesses
Absorptive capacity 24 gram salting liquids/1 gram product
With relatively poor superabsorbent product in the embodiment I of producing with conventional wet shop method relatively, have good intensity and flexibility by the superabsorbent product of embodiments of the invention II, and high absorptive capacity arranged.
The embodiment III
The explanation of this example prepares nonwoven fibrous superabsorbent product of the present invention with pilot-scale by the inventive method.
Adopt following step to produce 25 inches wide wet shop method superabsorbent product at pilot plant.
With (29 pounds of cellulose acetates; 1.8 dawn/monofilament * 0.25 inch), the Celbond105 bicomponent fiber is (3 pounds; Hoechst Celanese), super-absorbent polymer is (35 pounds; SANWET 1M-4510) and (100 milliliters of o-alkylation amine dispersants; Nalco92PE049) add in 1700 gallons the jar that contains 5% salting liquid (room temperature).The residence time of mixture in jar is about 45 minutes, and the pH of slurries is about 6 in jar.
The transmission belt speed of tilting silk screen machine is set in 15 feet per minutes.Take off the liquid net width of cloth and under 440 °F, carry out drying.
The specification of the finished product that obtains with the inventive method is as follows:
Water content 2.02%
Total basic weight 210 grams/square metre
Thickness 2.895mm (standard error 0.203mm)
4002.1 milligrams/square centimeter of ASTM stiffnesses
0.4 pound of fracture load of TENSILE STRENGTH
Absorptive capacity 13 gram salting liquid/every gram products
The embodiment IV
This example explanation is by of the present invention nonwoven fibrous superabsorbent product of the inventive method with the polyester fiber preparation.
According to the step of embodiment III, adopt (6.5 pounds of pet fibers; MP500 °F; Hoechst Celanese), Celbond105 fiber (25 pounds), super-absorbent polymer are (35 pounds; SANWET 1M-4510) and dispersant (100 milliliters, MileaseT, ICI Americas and 100 milliliters of Nalco PE φ 49).
The specification of the finished product that the method obtains is as follows:
Water content 2.2%
Total basic weight 170 grams/square metre
Thickness 1.75mm (standard error 0.073mm)
2161 milligrams/square centimeter of ASTM stiffnesses
0.4 pound of fracture load of TENSILE STRENGTH
Absorptive capacity 13 gram salting liquid/every gram products
Claims (15)
1. the nonwoven fibrous superabsorbent product of the thin web frame of a wet shop method, this product comprises
(a) fiber of average about 0.1-28mm of dawn number and the about 0.3-15mm of average length with
(b) the granular super-absorbent polymer that can form gel of the about 0.1-1.0mm of particle mean size; The weight ratio of fiber and granular super-absorbent polymer is about 20: 80-80: 20; Wherein the water content of superabsorbent product be lower than about 10wt%, total basic weight be about the 80-400 gram/square metre, thickness is about that 0.5-5mm, the about 10-30 of total absorptive capacity restrain aqueous medium/every gram superabsorbent product, the ASTM stiffness is about 1075-4500 milligram/square centimeter.
2. the superabsorbent product of claim 1, wherein fiber is selected from organic and inorfil.
3. the superabsorbent product of claim 1, wherein fiber is selected from polyester, polysaccharide and polysaccharide derivates.
4. the superabsorbent product of claim 1, wherein fiber is selected from cellulose and cellulose derivative.
5. the superabsorbent product of claim 1, wherein super-absorbent polymer is selected from polyacrylate.
6. the superabsorbent product of claim 1, wherein super-absorbent polymer is the polyacrylic acid alkali metal salt.
7. the superabsorbent product of claim 1, its TENSILE STRENGTH is about 0.3-2 pound fracture load.
8. the superabsorbent product of claim 1, its density is about 0.02-0.07 gram/cubic centimetre.
9. method of producing nonwoven fibrous superabsorbent product, this method comprises that (1) forms the water slurry contain about 0.1-1wt% component, component comprise (a) on average the about 0.1-28 of dawn number, the about 0.3-15mm of average length fiber and (b) graininess of the about 0.1-1.0mm of particle mean size can form the super-absorbent polymer of aquogel; The weight ratio of fiber and graininess super-absorbent polymer about 20: 80-80: 20; Said water slurry has the solution content of 0.12-7.50 mole monovalence metal inorganic salt; (2) from slurry form take off the thin web frame of liquid and (3) dry thin web frame with provide water content be lower than about 10wt%, the about 80-400 gram of total basic weight/square metre, the about 0.5-5mm of thickness, always the about 10-30 of absorptive capacity restrains the superabsorbent product of water-bearing media/every gram superabsorbent product and the about 1075-4500 milligram of ASTM stiffness/square centimeter.
10. the described method of claim 9, wherein fiber is selected from organic and inorfil.
11. the described method of claim 9, wherein the about 0-25 of the temperature of water slurry ℃.
12. the described method of claim 9, the wherein about 2-10 of the pH of water slurry.
13. the described method of claim 9, wherein inorganic salts are alkali halides.
14. the described method of claim 9, wherein inorganic salts are sodium chloride.
15. the superabsorbent product of producing according to the method for claim 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US909,133 | 1986-09-18 | ||
| US90913397A | 1997-08-11 | 1997-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1208088A true CN1208088A (en) | 1999-02-17 |
Family
ID=25426677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98115545A Pending CN1208088A (en) | 1997-08-11 | 1998-06-30 | Nonwoven fibrous superabsorbent product |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH11172598A (en) |
| CN (1) | CN1208088A (en) |
| ID (1) | ID20716A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100581593C (en) * | 2003-12-30 | 2010-01-20 | Sca卫生产品股份公司 | Absorbent structure and absorbent article comprising the absorbent structure |
| CN104245305A (en) * | 2012-02-03 | 2014-12-24 | 奥斯龙集团公司 | Gypsum board suitable for wet or humid areas |
| CN109688993A (en) * | 2016-07-15 | 2019-04-26 | Lia诊断公司 | Interim hydrophobic matrix material processing, material, kit and method |
| CN110249087A (en) * | 2017-01-31 | 2019-09-17 | 克瑙夫绝缘私人有限公司 | Improved adhesive composition and application thereof |
| US11480566B2 (en) | 2015-08-06 | 2022-10-25 | Lia Diagnostics, Inc. | Water dispersible assays |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AR015244A1 (en) * | 1998-03-13 | 2001-04-18 | Procter & Gamble | ABSORBENT MEMBER OF HIGH CAPILAR SUCTION STORAGE, ARTICLE THAT UNDERSTANDS IT AND METHOD OF FORMATION OF SUCH ABSORBENT MEMBER |
| EP3405153B1 (en) * | 2015-01-30 | 2019-12-04 | Plus Research S.R.L. | Superabsorbent material sat (super absorbent tissue) |
| JP6971360B2 (en) * | 2016-01-20 | 2021-11-24 | パルンボ ジャンフランコPALUMBO, Gianfranco | Highly absorbent material SAT (highly absorbent thin paper) |
-
1998
- 1998-06-30 CN CN98115545A patent/CN1208088A/en active Pending
- 1998-08-03 ID IDP981077A patent/ID20716A/en unknown
- 1998-08-10 JP JP10225526A patent/JPH11172598A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100581593C (en) * | 2003-12-30 | 2010-01-20 | Sca卫生产品股份公司 | Absorbent structure and absorbent article comprising the absorbent structure |
| CN104245305A (en) * | 2012-02-03 | 2014-12-24 | 奥斯龙集团公司 | Gypsum board suitable for wet or humid areas |
| US11480566B2 (en) | 2015-08-06 | 2022-10-25 | Lia Diagnostics, Inc. | Water dispersible assays |
| CN109688993A (en) * | 2016-07-15 | 2019-04-26 | Lia诊断公司 | Interim hydrophobic matrix material processing, material, kit and method |
| US11325103B2 (en) | 2016-07-15 | 2022-05-10 | Lia Diagnostics, Inc. | Temporary hydrophobic matrix material treatments, materials, kits, and methods |
| CN109688993B (en) * | 2016-07-15 | 2022-05-13 | Lia诊断公司 | Temporary hydrophobic matrix material treatment, materials, kits and methods |
| CN110249087A (en) * | 2017-01-31 | 2019-09-17 | 克瑙夫绝缘私人有限公司 | Improved adhesive composition and application thereof |
| CN110249087B (en) * | 2017-01-31 | 2022-08-02 | 克瑙夫绝缘私人有限公司 | Improved adhesive composition and use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| ID20716A (en) | 1999-02-18 |
| JPH11172598A (en) | 1999-06-29 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |