CN1239535C - Method for making water-absorbent acrylate resin - Google Patents
Method for making water-absorbent acrylate resin Download PDFInfo
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- CN1239535C CN1239535C CNB2003101063508A CN200310106350A CN1239535C CN 1239535 C CN1239535 C CN 1239535C CN B2003101063508 A CNB2003101063508 A CN B2003101063508A CN 200310106350 A CN200310106350 A CN 200310106350A CN 1239535 C CN1239535 C CN 1239535C
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- water
- vinylformic acid
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- absorbing resin
- acrylic acid
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Abstract
The present invention discloses a method for preparing acrylate water absorption resin, which is characterized in that the concentration of acrylic acid monomers are diluted to 40% to 80% with water, and after 60% to 90% of the mole number of carboxyl groups is neutralized with alkali at 0 to 30 DEG C, the acrylic acid monomers are mixed with a composite crosslinking agent occupying 1.0 to 5.1% of the weight of acrylic acid, a chelating agent occupying 0.025 to 5.0% of the weight of the acrylic acid, an initiating agent occupying 0.1 to 1% of the weight of the acrylic acid and a reducing agent occupying 5*10<-4> to 1*10<-3> of the weight of the acrylic acid to obtain a water phase solution; under the condition of 50 to 90 DEG C, the water phase solution is moved into another reactor so as to initiate the water phase solution to polymerize; a polymer obtained from the polymerization reaction is cooled, and after the polymer is dried, macromolecule water absorption resin is obtained. The present invention provides a preparation method for acrylate water absorption resin, which has the advantages of simple reaction process and short reaction time, and the absorption capacity to physiological saline matched with tap water and the absorption capacity to the tap water of the obtained products respectively reach more than 190 ml/g and 900 ml/g.
Description
Technical field:
The present invention relates to a kind of synthetic method of crosslinked salt polyacrylate hydroscopic high-molecular resin, particularly relates to a kind of manufacture method of acrylate water-absorbing resin.
Background technology:
Hydroscopic high-molecular resin is a new functional macromolecule material, has purposes widely.From kind, mainly contain graft starch class (the fit cross-linking agent of starch and acrylic graft copolymer) and crosslinked salt polyacrylate two big classes.Wherein, the latter is because preparation technology is simple relatively, and stability is high, be difficult for going mouldy, and be the principal item of existing market High hydrophilous resin.
Water-absorbing resin is succeeded in developing in 1969 by USDA north institute at first, and method is with W-Gum and acrylonitrile graft copolymer, uses sodium hydroxide hydrolysis again.Because this method adopts the very strong acrylonitrile monemer of toxicity, Japan replaced vinyl cyanide with vinylformic acid afterwards, again with the direct graft polymerization of starch.After this, various water-absorbing resins (for example United States Patent (USP) No. 3980663, No. 4093776, No. 4954562, No. 4880858 and european patent application disclose No. 467073, No. 478150, No. 454497 etc.) have been developed in the U.S., Japan, Europe in succession.Water-absorbing resin has obtained in fields such as physiological hygiene articles for use, medical material, agricultural and gardening, agricultural chemicals, chemical fertilizer, petrochemical complex, daily-use chemical industry, fresh keeping product, foodstuffs industry, civil construction, textiless to use widely.At present, the Application Areas of water-absorbing resin maximum is a personal hygiene article, such as: various suction articles for use such as Children's diaper, sanitary napkin.By adding a spot of water-absorbing resin, can improve its liquid retention characteristic, and reduce the liquid infiltration amount, and can make sanitary towel or diaper become thinner, lighter, use more convenient more comfortable.Secondly, water-absorbing resin can be used as water-loss reducer of soil on agricultural gardening, for example: add the water-absorbing resin of 0.1% (weight) in soil, can make soil have suff water required for plant-growth in a long time, improve farm crop and germinate and surviving rate.In addition, aspect building, water-absorbing resin can be used as impervious leakage-stopping agent, anti-caking distillate medicinal water; On petrochemical complex, be used as oil-water separating agent; In industrial textile, be used for anti-undershirt, Sweat-proof shoes pad etc.; In filed of daily-use chemical industry, can be used as and make slow releasing pharmaceutical, release controlled fertilizer, reodorant and makeup etc.
Up to the present, relevant water solution polymerization process prepares the existing a lot of report of preparation method of crosslinked salt polyacrylate hydroscopic high-molecular resin both at home and abroad, but all there is the unfavorable problem of salt effect of inhaling, thereby caused super-strong moisture absorbing resin to wait the limitation of using afforestation, and not only the not obviously raising of salt effect is inhaled in the invention that has, and aftertreatment is more complicated, thereby improved the cost of product greatly, the processing that also must carry out methyl alcohol as the resin that proposes in the patent (CN1262284A) to produce improves its suction and inhales the salt effect, improved the cost of product greatly, and its suction physiological saline multiple neither be very high, and patent (CN1080642) adds activation kaolin in reaction, improved the gel-strength and the reaction times of product, inhaled the salt effect but also greatly reduce.
Summary of the invention:
Technical problem to be solved by this invention is: the invention provides the manufacture method of the acrylate water-absorbing resin that a kind of reaction process is simple, the reaction times is short, the present invention can improve the suction salt and the water-retaining capacity of its products therefrom.
The present invention is a kind of manufacture method of acrylate water-absorbing resin, its technical scheme is: the first step: be diluted with water to weight concentration 40%-80% by Acrylic Acid Monomer, under 0-30 ℃ in alkali and behind the 60%-90% of carboxyl mole number, with the 1.0-5.1% multiple crosslinking agent that accounts for vinylformic acid weight, with the sequestrant that accounts for the 0.25-5.0% of vinylformic acid weight, account for vinylformic acid weight the 0.1-1% initiator, with account for 5 * 10 of vinylformic acid weight
-4～1 * 10
-3Reductive agent mix, obtain aqueous phase solution, under 50～90 ℃ of conditions, cause the aqueous phase solution polymerization,
Second step: the polyreaction resulting polymers is cooled off the aqueous resins colloid of the gained water-absorbing resin that secures satisfactory grades after drying.
The used sequestrant of the present invention is for containing a plurality of carboxyls or hydroxyl organic compound, as oxalic acid tetraacethyl (EDTA), 2-aniline sulfonic acid oxalic acid, nitrilotriacetic acid(NTA) etc., this compounds is because energy and metal ion-chelant, reduce metal ion thus and exist acrylate copolymer chain swollen restraining effect, thus the salt tolerance of raising water-absorbing resin.
Used multiple crosslinking agent is N among the present invention, the mixture of N '-methylene bis acrylamide and acrylamide, in the multiple crosslinking agent acrylamide account for vinylformic acid weight 1.0～5.0%, N, N '-methylene bis acrylamide accounts for 0.01～0.10% of vinylformic acid weight.
The initiator that uses among the present invention is polymer reaction persulfate initiator commonly used, and as ammonium persulphate, Potassium Persulphate etc., its consumption accounts for 0.1～0.5% of vinylformic acid weight.
The reductive agent that uses among the present invention is sulphite, also can use other sulphite such as potassium sulfite, ammonium sulphite etc., and its consumption accounts for 5 * 10 of vinylformic acid weight
-4～1 * 10
-3
Beneficial effect of the present invention is: 1. add sequestrant before the reaction and participate in reaction directly, reaction process is simple, and has shortened the reaction times greatly; 2. because the metal ion of sequestrant in can chelating water, thereby the ion pair acrylate copolymer chain swollen that reduces in the water suppresses, and sequestrant can be linked in the resin chain, thereby improves the resin necessary cavernous structure that absorbs water; The adding of reductive agent has prevented the oxidation of reaction process, thereby the product water absorbing properties is significantly increased, and inhaling tap water is more than the 800ml/g; The physiological saline that the suction tap water is joined is more than the 150ml/g; 3. be convenient to large-scale production.
Embodiment:
Embodiment 1
A kind of preparation method of acrylate water-absorbing resin,
The first step: be diluted with water to weight concentration 40%-80% by Acrylic Acid Monomer, under 0-30 ℃ in alkali and behind the 60%-90% of carboxyl mole number, with the 1.0-5.1% multiple crosslinking agent that accounts for vinylformic acid weight, with the sequestrant that accounts for the 0.25-5.0% of vinylformic acid weight, account for vinylformic acid weight the 0.1-1% initiator, with account for 5 * 10 of vinylformic acid weight
-4～1 * 10
-3Reductive agent mix, obtain aqueous phase solution, in the present embodiment, the content of used sequestrant can be chosen to be 1.5%, 2.3%, 2.61%, 4%, for containing a plurality of carboxyls or hydroxyl organic compound, as oxalic acid tetraacethyl (EDTA), 2-aniline sulfonic acid oxalic acid, nitrilotriacetic acid(NTA) etc., used multiple crosslinking agent is N, the mixture of N '-methylene bis acrylamide and acrylamide, acrylamide accounts for 1.0～5.0% of vinylformic acid weight in the multiple crosslinking agent, for example: can choose 1.8%, 3%, 3.8%, 4.5%, N, N '-methylene bis acrylamide accounts for 0.01～0.10% of vinylformic acid weight, for example: can select 0.014%, 0.03%, 0.05%, 0.065%, used initiator is a polymer reaction persulfate initiator commonly used, as ammonium persulphate, Potassium Persulphate etc., its consumption accounts for 0.1～0.5% of vinylformic acid weight, and used reductive agent is a sodium sulphite anhydrous 99.3, also can use other sulphite such as potassium sulfite, ammonium sulphites etc., its consumption accounts for 5 * 10 of vinylformic acid weight
-4～1 * 10
-3Under 50～90 ℃ of conditions; aqueous phase solution is moved into another reactor; cause the aqueous phase solution polymerization; in the present embodiment; before aqueous phase solution carries out polyreaction, aqueous phase solution is placed under the protection of nitrogen gas, be warming up to 50-65 ℃; as 52 ℃, 55 ℃, 60 ℃, 63 ℃; reaction times is 0.5-1.5 hour, and the present embodiment selective reaction time is 0.8,0.9,1.0,1.1,1.2 hour, heats up 60 ℃-90 ℃ again; as 60 ℃, 65 ℃, 72 ℃, 75 ℃, 78 ℃, 80 ℃; reacted 0.3-1 hour, as 0.4,0.45,0.5,0.55,0.6,0.7 hour
Second step: the polyreaction resulting polymers is cooled to is lower than 50 ℃, the aqueous resins colloid of the gained water-absorbing resin that secures satisfactory grades after drying.
Embodiment 2:
In the there-necked flask of 250mL, drop into vinylformic acid 24g, stir, add 24g water, controlled temperature is at 10-20 ℃, drip 30% sodium hydroxide solution 34.6g, continue to stir after 5 minutes, add acrylamide 0.75g, add N, N '-methylene-bisacrylamide solid 0.0124g, Ammonium Persulfate 98.5 solid 0.064g, S-WAT 0.0001g, EDTAO.60g, continue to stir 10 minutes, and reaction solution was moved into another was airtight and feed in the groove type reactor of nitrogen, 60～65 ℃ of reactions 1 hour down, be warming up to 70 ℃ of reactions 30 minutes then, section is taken out the colloid that polymerization is good in cooling, oven dry is crushed to 40 orders then.Obtain dried resin 31g.Test its performance respectively, the results are shown in subordinate list.
Embodiment 3:
The dried resin 29g that makes with similarly to Example 2 method.Test its performance respectively, the results are shown in subordinate list.
Embodiment 4: prescription similarly to Example 2 and prepared water-absorbing resin, but use 2-aniline sulfonic acid oxalic acid to be reductive agent as sequestrant and anhydrous sodium ammonium sulfate, obtain High hydrophilous resin.
Embodiment 5:
Prescription similarly to Example 2 and prepared water-absorbing resin, but use nitrilotriacetic acid(NTA) to be reductive agent as sequestrant and anhydrous potassium sulfite, obtain High hydrophilous resin.
Comparative example 1:
Prescription similarly to Example 2 and prepared water-absorbing resin, but sequestrant EDTA consumption is 0.0g.Obtain dried resin 26g.Test its performance respectively, the results are shown in subordinate list.
Comparative example 2:
Prescription similarly to Example 2 and prepared water-absorbing resin, but the acrylamide consumption is 0.75g, N, N '-methylene-bisacrylamide consumption is 0.0024g, does not add S-WAT, obtains dried resin 27g.Test its performance respectively, the results are shown in subordinate list.
Comparative example 3:
Prescription similarly to Example 2 and prepared water-absorbing resin, but the acrylamide consumption is 1.20g, N, N '-methylene-bisacrylamide consumption is 0.0246g, does not add S-WAT, sequestrant EDTA consumption is 2.4g.Obtain dried resin 32g.Test its performance respectively, the results are shown in subordinate list.
Subordinate list: water-absorbing resin The performance test results
Annotate 1
| EDTA measures (g) | Amount of acrylamide (g) | N, N '-methylene-bisacrylamide amount (g) | S-WAT amount (g) | Inhale tap water multiple (g/g) | Inhale the 0.9% physiological saline multiple (g/g) that tap water is joined | |
| Embodiment 1 embodiment 2 comparative examples 1 comparative example 2 Annotate 2Comparative example 3 | 0.60 0.60 0.00 0.60 2.40 | 0.75 0.75 0.75 0.24 1.20 | 0.0124 0.0124 0.0124 0.0024 0.0246 | 0.0001 0.0001 0.0001 do not have | 906 810 510 -- 394 | 193 178 140 -- 146 |
[notes]:
1, suction multiple and suction salt multiple adopt the test of tea bag method.
2, product is water-soluble.
Claims (4)
1, a kind of preparation method of acrylate water-absorbing resin is characterized in that:
The first step: be diluted with water to weight concentration 40%-80% by Acrylic Acid Monomer, under 0-30 ℃ in alkali and behind the 60%-90% of carboxyl mole number, with the 1.0-5.1% multiple crosslinking agent that accounts for vinylformic acid weight, with the sequestrant that accounts for the 0.25-5.0% of vinylformic acid weight, account for vinylformic acid weight the 0.1-1% initiator, with account for 5 * 10 of vinylformic acid weight
-4～1 * 10
-3Reductive agent mix, obtain aqueous phase solution, again aqueous phase solution is placed under the nitrogen protection; be warming up to 50-65 ℃; reacted 0.5～1.5 hour, and be warming up to 60-90 ℃ again, reacted 0.5-1 hour; cause the aqueous phase solution polymerization; used multiple crosslinking agent N, the mixture of N '-methylene bis acrylamide and acrylamide, wherein acrylamide account for vinylformic acid weight 1.0～5.0%, N; N '-methylene bis acrylamide accounts for 0.01～0.10% of vinylformic acid weight
Second step: the polyreaction resulting polymers is cooled off the aqueous resins colloid of the gained water-absorbing resin that secures satisfactory grades after drying.
2, the preparation method of acrylate water-absorbing resin according to claim 1 is characterized in that used sequestrant is the organic compound that contains a plurality of carboxyls or hydroxyl.
3, the preparation method of acrylate water-absorbing resin according to claim 1 is characterized in that used initiator is a persulphate.
4, the preparation method of acrylate water-absorbing resin according to claim 1 is characterized in that used reductive agent is a sulphite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101063508A CN1239535C (en) | 2003-11-19 | 2003-11-19 | Method for making water-absorbent acrylate resin |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101063508A CN1239535C (en) | 2003-11-19 | 2003-11-19 | Method for making water-absorbent acrylate resin |
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| CN1239535C true CN1239535C (en) | 2006-02-01 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400562C (en) * | 2005-12-15 | 2008-07-09 | 中国地质大学（武汉） | Flyash-containing composite material with high water absorption and preparation method thereof |
| CN100398573C (en) * | 2006-06-30 | 2008-07-02 | 上海华谊丙烯酸有限公司 | Method for preparing high absorptive resin in acrylic acid type |
| WO2010118555A1 (en) * | 2009-04-16 | 2010-10-21 | 深圳市鸿华药业有限公司 | Use of acrylate resin and grafted polymer thereof in preparation of hemostatic dressing and preparation method thereof |
| CN102603946B (en) * | 2012-03-16 | 2016-01-13 | 广州埃文森生物科技有限公司 | A kind of preparation method of super absorbent resin |
| CN106496382B (en) * | 2015-09-07 | 2019-01-25 | 中山市恒广源吸水材料有限公司 | A kind of super absorbent resin and its preparation method and application |
| CN107189772A (en) * | 2017-05-02 | 2017-09-22 | 中国地质大学（武汉） | One kind can water swelling sealing agent |
| CN107151552A (en) * | 2017-05-04 | 2017-09-12 | 中国地质大学（武汉） | One kind can water swelling sealing agent |
| CN108003856B (en) * | 2017-12-01 | 2020-07-07 | 北京恒聚化工集团有限责任公司 | Beaded microsphere profile control water shutoff agent and preparation method thereof |
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