CN1220324A - Nonwoven fibrous superabsorbent product - Google Patents
Nonwoven fibrous superabsorbent product Download PDFInfo
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- CN1220324A CN1220324A CN98116777A CN98116777A CN1220324A CN 1220324 A CN1220324 A CN 1220324A CN 98116777 A CN98116777 A CN 98116777A CN 98116777 A CN98116777 A CN 98116777A CN 1220324 A CN1220324 A CN 1220324A
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Abstract
The invention provides a improved method for producing a nonwoven fibrous ultra-absorbing web, the product has good assembly of intensity, flexibility and absorbing capacity. The method uses a group I metal salt in pulp stage to uttermostly reduce swelling of ultra-absorbing polymer.
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.
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 the novel nonwoven fibrous superabsorbent product that density, flexibility and absorptive capacity present favourable 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 EP 437816 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, this method comprises that (1) forms 0.1-1wt% and comprises that (a) average dawn number (denier) is 0.1-28, the polymer fiber of the about 0.3-15mm of average length, (b) the granular super-absorbent polymer of the formation aquogel 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 the component of 20) and (c) about 0.05-7.50 mole I family metal salt solution, (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%, every square metre of total basic weight less than about 80-400 gram, the about 0.5-5mm of thickness, the total absorptive capacity of the about 10-30 gram of every gram superabsorbent product water-bearing media and the ASTM stiffness of every square centimeter of about 1075-4500 milligram.
The present invention aims to provide the nonwoven fibrous superabsorbent product of the thin web frame in a kind of wet shop, this product 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 and spins that 10wt%, total basic weight are about every square metre of 80-400 gram, thick about 0.5-5mm, always absorptive capacity is that the about 10-30 of every gram superabsorbent product restrains water-bearing media, the ASTM stiffness is 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.
Superabsorbent product of the present invention provides with wet shop method.The fibroreticulate technology in wet shop is widely adopted in production nonwoven web structure, such as US 5,531, and narration to some extent in 728 and so on the publication, the wet shop method that is fit to comprises manual lapping and utilizes the wet shop method (as US 3,301, described in 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 pH scope that aqueous slurry in this method can have is about 2-10, preferably about 3-8.
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 available suction of dewatering allows case or other vacuum plant to 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, and 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 US 4,483,743 and US 4,761, the high surface area fiber of expansion fibrillation cellulose fibre described in 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-.10mm 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 JagakuCo., Ltd.); ARASORB (Arakawa Chemical Co.); ARIDALL 1125 (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 I family metal that an aqueous solution content is about the 0.05-7.50 mole.Inorganic salts and organic salt all are useful, though inorganic salts generally have higher ion concentration to guarantee metal cation and anionic disassociation because of it thereby are preferred.The illustrative examples of non-limiting salt is an alkali halide, such as sodium chloride, sodium bromide, potassium chloride and potassium bromide; Alkali nitrates is such as sodium nitrate, potassium nitrate; And alkali metal sulfates, comprise sodium sulphate, potassium sulfate, niter cake and potassium acid sulfate.Alkali metal sulfates is particularly preferred, can cause that process pipeline (comprising stainless steel pipes) produces rust staining because found some alkali halide (for example sodium chloride).Other favourable salt comprises sodium carbonate, potash, sodium bicarbonate, potassium acid sulfate, sodium phosphate, potassium phosphate, sodium hydrogen phosphate and dipotassium hydrogen phosphate, sodium dihydrogen phosphate and potassium dihydrogen phosphate.Except that alkali metal salt, it also is useful adding ammonium salt in slurry solution.Particularly inorganic ammonium salt is useful in finishing the object of the invention, and can be used as callable waste product, for example as chemical fertilizer.The example of useful ammonium salt comprises ammonium bromide, ammonium iodide, ammonium nitrate, ammonium sulfate, ammonium hydrogen sulfate, ammonium carbonate, carbonic hydroammonium, ammonium phosphate, ammonium hydrogen phosphate and ammonium dihydrogen phosphate (ADP).Preferred salinity is the 0.05-2.50 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.
Existing in the method for wet shop of I family slaine plays an important role.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 measurement of the stiffness of superabsorbent product is by ASTMD 1388-64
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 CelaneseCorp.) 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 just illustrates with the inventive method and prepares nonwoven fibrous superabsorbent product.
Step by the embodiment I is carried out, but adopts 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 gram/square metre 2039.2 milligrams of/square centimeter absorptive capacities of thickness 4.2mm (standard error 0.222mm) ASTM stiffness 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; Nalco 92PE049) 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 gram/square metre 0.4 pound of fracture load absorptive capacity of 4002.1 milligrams of/square centimeter TENSILE STRENGTH of thickness 2.895mm (standard error 0.203mm) ASTM stiffness 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; 500 of MP; Hoechst Celanese), Celbond 105 fibers (25 pounds), super-absorbent polymer are (35 pounds; SANWET 1M-4510) and dispersant (100 milliliters, MileasT, 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 gram/square metre 0.4 pound of fracture load absorptive capacity of 2161 milligrams of/square centimeter TENSILE STRENGTH of thickness 1.75mm (standard error 0.073mm) ASTM stiffness 13 gram salting liquid/every gram products
The embodiment V
This example explanation is by the preparation of the nonwoven fibrous superabsorbent product of the inventive method.
In a laboratory with blender with cellulose acetate fibre (total amount be 2.51 the gram 1.8 dawn/monofilament * 6.35mm and 1.8 dawn/monofilament * 12.7mm fibers), super-absorbent polymer (5.85 SANWET 1M-4510; Hoechst Celanese Corp.) and salting liquid (42.6 gram anhydrous sodium sulfates (Fisher Chemical) are dissolved in the 0.3M solution of 1 liter of 991.4 gram distilled water preparation) mixed for 15 seconds, the mixture impouring is filled in 18 liters of laboratory scale high-order stuff boxs of 11 premium on currency (20 ℃), mix with hand.Discharge water then.Total elapsed-time standards of this step is about 3 minutes.With the dry period that preformed web frame heating one prolongs, obtained acceptable handmade paper and tested.
The specification of finished product of the present invention is as follows: the absorptive capacity 20 gram salting liquid/gram products under the centrifugal reserve capacity 15 gram salting liquids of total basic weight 250 gram/square metre total absorptivities 39 gram salting liquid/gram products/gram product 100 gram loads
The total absorptivity of superabsorbent product is measured as follows: the accurate weighing 0.200 gram net width of cloth, be placed in the tea bag of 6 * 6cm, and seal the opening of tea bag then and tea bag is placed the surface 1 minute of 0.87% salt solution, immersed salt solution again 20 minutes.Soak the suction phase at this and take out tea bag and it was hung drip 5 minutes after finishing, write down blank tea bag and contain the tea bag weight of superabsorbents.
The mensuration of total absorptivity has been used the average of 3 tea bags.
The mensuration of the centrifugal reserve capacity of superabsorbent product is as follows: tea bag and two wet tea bags of blank of two testing total absorptivities are put into centrifugal basket, tea bag and blank tea bag are placed relative to each other, the tea bag that contains sample is not wanted crossover.Centrifugal beginning, motor be with 1400 rev/mins speed fast rotational tea bag 3 minutes, stops centrifugally, and tea bag is weighed.
Claims (20)
1. method of producing nonwoven fibrous superabsorbent product, this method comprise that graininess that (1) forms the fiber that comprises (a) the average about 0.1-28 of dawn number, the about 0.3-15mm of average length, the about 0.1-1.0mm of (b) particle mean size can form the super-absorbent polymer of aquogel and (c) aqueous slurry of I family slaine; (2) form the thin web frame that takes off liquid from slurry; (3) dry thin web frame is to provide superabsorbent product.
2. the described method of claim 1, wherein fiber is selected from organic and inorfil.
3. the described method of claim 1, wherein the temperature of aqueous slurry is about 0-25 ℃.
4. the described method of claim 1, wherein the pH scope of said slurry is about 2-10.
5. the described method of claim 4, wherein the pH scope of said slurry is about 3-8.
6. the described method of claim 1, wherein I family slaine is inorganic salts.
7. the described method of claim 6, wherein inorganic salts are alkali metal sulfates.
8. the described method of claim 7, wherein inorganic salts are sodium sulphate.
9. the described method of claim 1, wherein the weight ratio of fiber and graininess super-absorbent polymer is about 20: 80-80: between 20.
10. the described method of claim 1, wherein the weight ratio of fiber and graininess super-absorbent polymer is about 20: 80-50: between 50.
11. the described method of claim 1, wherein I family slaine is present in the slurry with the solution concentration of 0.05-7.50 mole.
12. the described method of claim 1, wherein I family slaine is present in the slurry with the solution concentration of 0.05-2.50 mole.
13. the described method of claim 1, wherein the water content of said superabsorbent product is lower than about 10wt%, the about 80-400 gram of total basic weight/square metre, the about 0.5-5mm of thickness, always absorptive capacity is about every gram superabsorbent product 10-30 and restrains water-bearing media, the about 1075-4500 milligram of ASTM stiffness/square centimeter.
14. a method for preparing the wet shop of nonwoven method super-absorbent polymer impregnated structures, this method may further comprise the steps: with fiber, mix with the formation feed with the super-absorbent polymer and the water (through handling with I family slaine with inhibition super-absorbent polymer swelling) of said fiber separation; Feed is taken off liquid form preform constructions; With the preform constructions drying to form the wet shop of nonwoven method super-absorbent polymer impregnated structures.
15. the described method of claim 14, wherein I family slaine is inorganic salts.
16. the described method of claim 15, wherein inorganic salts are alkali metal sulfates.
17. the described method of claim 16, wherein inorganic salts are sodium sulphate.
18. the described method of claim 14, wherein fiber is selected from organic fiber and inorfil.
19. the described method of claim 14, wherein the weight ratio of fiber and super-absorbent polymer is about 20: 80-80: between 20.
20. press the superabsorbent product that the method for claim 14 is produced.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US99297697A | 1997-12-18 | 1997-12-18 | |
| US992,976 | 1997-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1220324A true CN1220324A (en) | 1999-06-23 |
Family
ID=25538961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98116777A Pending CN1220324A (en) | 1997-12-18 | 1998-07-31 | Nonwoven fibrous superabsorbent product |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH11189997A (en) |
| CN (1) | CN1220324A (en) |
| ID (1) | ID21535A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5869278B2 (en) * | 2011-09-28 | 2016-02-24 | 大王製紙株式会社 | Sanitary tissue paper and method for producing sanitary tissue paper |
| 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) |
| JP7452241B2 (en) * | 2020-05-21 | 2024-03-19 | 王子ホールディングス株式会社 | absorbent articles |
-
1998
- 1998-07-31 ID IDP981064A patent/ID21535A/en unknown
- 1998-07-31 CN CN98116777A patent/CN1220324A/en active Pending
- 1998-08-03 JP JP10218984A patent/JPH11189997A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ID21535A (en) | 1999-06-24 |
| JPH11189997A (en) | 1999-07-13 |
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