CN101104783A - Method for preparing earthwork synthetic material adhesive - Google Patents
Method for preparing earthwork synthetic material adhesive Download PDFInfo
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- CN101104783A CN101104783A CNA2007100124381A CN200710012438A CN101104783A CN 101104783 A CN101104783 A CN 101104783A CN A2007100124381 A CNA2007100124381 A CN A2007100124381A CN 200710012438 A CN200710012438 A CN 200710012438A CN 101104783 A CN101104783 A CN 101104783A
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- polyacrylamide
- acrylamide
- alkaline condition
- condensation reaction
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Abstract
Disclosed is a method of making adhesive for geosynthetics, which relates to the synthesis of modified polyacrylamide. The method comprises the steps: synthesizing polyacrylamide with low molecular weight, wherein the monomer is acrylamide and the initiator is ammonium persulphate and the chain transfer agent is sodium formate; hydroxymethylating the low- molecular- weight polyacrylamide with formaldehyde under alkaline condition; obtaining modified polyacrylamide through condensation reaction between hydroxymethylation polyacrylamide and acrylamide under alkaline condition; synthesizing gel under room temperature by rapidly crosslinking the modified polyacrylamide aqueous solution with crosslinking agent, initiator and accelerator; finally adding bentonite. The nontoxic modified polyacrylamide is provided with rapid crosslinking polymerization, less heat release during crosslinking polymerization, high gel strength and long service time, suitable for the preparation of geotechnical waterproof material when wrapped by bentonite.
Description
Technical field
The present invention relates to a kind of synthetic method of synthetic materials, particularly relate to a kind of synthetic method that is used for the modified polyacrylamide of synthetic geotechnological water-proof material.
Background technology
Geosynthetics bentonite liner (Geosynthetic Clay Liner is called for short GCL) is a kind of novel geosynthetics that occurs in the world the mid-90 in 20th century.The barrier performance of GCL just progressively obtains the approval of engineering circle between compacting clay liner (CCL) and macromolecular material geomembrane, be applied in increasing engineering field.The geosynthetics bentonite pad is a clamp wilkinite between two-layer geosynthetics, and by a kind of NEW TYPE OF COMPOSITE impervious material that technologies such as acupuncture, bonding or stitching are made, relying on the montmorillonite is that the wilkinite interlayer of major ingredient plays the antiseepage effect.Wherein, adhesion type GCL (single, double layer) uses the bonding very thin from level to level wilkinite of water-soluble binder, and the tectum geotextile can be a nonwoven fabric, and yarn fabric is also arranged.But because general tackiness agent curing back water-absorbent is low, the adding of tackiness agent reduces bentonitic penetrating quality, the formation of glued construction also can make between the wilkinite and to be lost the original characteristic of wilkinite because isolate, owing to exist than big-difference with bentonitic water-swellable multiple, easily ftracture when causing geotechnological material (particularly individual layer GCL) water-swellable, resistance to hydrolysis can be poor, influences the whole barrier performance of material.
Summary of the invention
The object of the present invention is to provide a kind of be used for synthetic geotechnological water-proof material the synthetic method of modified polyacrylamide.This method adopts the tackiness agent of modified polyacrylamide as the wilkinite geosynthetics, and rate of crosslinking is fast to reach, low, the anti-hydrolysis ability of polymerization exotherm temperature reaches the water-swellable multiple purpose suitable with wilkinite by force.
The objective of the invention is to be achieved through the following technical solutions:
A kind of preparation method of earthwork synthetic material adhesive, it is a monomer with the acrylamide at first, is initiator with the ammonium persulphate, is the synthetic low-molecular-weight polyacrylamide of chain-transfer agent with the sodium formiate; With formaldehyde under alkaline condition to low-molecular-weight polyacrylamide methylolation; Make methylolation polyacrylamide and acrylamide under alkaline condition, carry out condensation reaction and obtain modified polyacrylamide; The modified polyacrylamide aqueous solution and linking agent under the room temperature, promotor and initiator be the crosslinked gel that obtains fast, adds wilkinite again and can prepare this earthwork synthetic material adhesive.
The preparation method of aforesaid a kind of earthwork synthetic material adhesive, its low-molecular-weight polyacrylamide is synthetic:
Sodium formiate, water and part propylene acid amides are being mixed more than 60 ℃, adding Ammonium Persulfate 98.5 again and remaining acrylamide carries out polyreaction;
Hydroxymethylation:
Above-mentioned polymerisate, under constant temperature and alkaline condition with formaldehyde reaction;
Condensation reaction:
Above-mentioned hydroxymethylation product, under alkaline condition with the acrylamide condensation reaction;
Crosslinking reaction:
Above-mentioned condensation reaction products and linking agent, promotor, initiator effect get jelly shape colloid.
The preparation method of aforesaid a kind of earthwork synthetic material adhesive, the temperature of its polyreaction be 60 ℃～more than 80 ℃, the time is 2h; The temperature of hydroxymethylation is that 40 ℃, pH value are 10, and the reaction times is 2h; The temperature of condensation reaction is that 55 ℃, pH value are 10, and the reaction times is 3h.
Advantage of the present invention and effect are:
1. modified polyacrylamide of the present invention gelation rate when room temperature is fast, favourable practical application; And modified polyacrylamide is nontoxic, can not bring secondary pollution.
2. modified polyacrylamide of the present invention is crosslinked by side-chain radical, has reduced the water-absorbent of gel and water-disintegrable, makes gel have good stability and mechanical property.
3. the expansion rate of water absorption of cross-linked polyacrylamide of the present invention is close with bentonitic expansion rate of water absorption, has overcome geotechnique's water-proof material suction back shortcoming easy to crack when using general purpose adhesive.
4. the synthesis technique of modified polyacrylamide of the present invention is simple, and cost is low, but suitability for industrialized production.
Embodiment
1, the synthesis technique of modified polyacrylamide
Take by weighing 8～11 gram acrylamides, 85～96 gram water, (initiator, concentration are 3.0 * 10 to ammonium persulphate
-3Mol/L), (chain-transfer agent, concentration are 8 * 10 to sodium formiate
-2Mol/L).At first in the reactor that agitator, prolong and thermometer are housed, add sodium formiate and the portion water weighed up, open well heater and agitator simultaneously, pour the part propylene amide solution into four-hole bottle, the remaining solution dropping funnel of packing into.
When temperature reaches more than 60 ℃, add the ammonium persulphate of having prepared, when temperature reaches 80 ℃, begin to drip remaining acrylamide soln, dropwise afterreaction 2h.
Continue attemperation being 40 ℃ is 10 with pH value (using triethylamine), adds formaldehyde during constant temperature and controls the pH value at any time, behind the constant temperature time 2h, stops heating.
It is 10 with the pH value that attemperation is 55 ℃, and constant temperature adds acrylamide and controls the pH value at any time, behind the isothermal reaction 3h, stops heating.It is standby to drop to room temperature.
2, the gel of modified polyacrylamide
Get the aqueous solution that contains about 30 gram modified polyacrylamides, add the linking agent N that accounts for about 2% (mol ratio) of monomer total amount successively, N '-methylene-bisacrylamide, an amount of accelerant N, N, N ', N '-Tetramethyl Ethylene Diamine stirs, add the initiator ammonium persulfate aqueous solution again, stir fast, behind the standing and reacting number minute, jelly shape colloid.Can prepare a kind of geotechnological water-proof material as the wilkinite that adds about 65～75 grams simultaneously.
Introducing has high reaction activity-CHCH on the amide group of polyacrylamide
2, make easy crosslinking polymerization under this linear macromolecule room temperature, help improving the performance of gel.
Claims (3)
1. the preparation method of an earthwork synthetic material adhesive is characterized in that, is monomer with the acrylamide at first, is initiator with the ammonium persulphate, is the synthetic low-molecular-weight polyacrylamide of chain-transfer agent with the sodium formiate; With formaldehyde under alkaline condition to low-molecular-weight polyacrylamide methylolation; Make methylolation polyacrylamide and acrylamide under alkaline condition, carry out condensation reaction and obtain modified polyacrylamide; The modified polyacrylamide aqueous solution and linking agent under the room temperature, promotor and initiator be the crosslinked gel that obtains fast, adds wilkinite again and can prepare this earthwork synthetic material adhesive.
2. the preparation method of a kind of earthwork synthetic material adhesive according to claim 1 is characterized in that, low-molecular-weight polyacrylamide is synthetic:
Sodium formiate, water and part propylene acid amides are being mixed more than 60 ℃, adding Ammonium Persulfate 98.5 again and remaining acrylamide carries out polyreaction;
Hydroxymethylation:
Above-mentioned polymerisate, under constant temperature and alkaline condition with formaldehyde reaction;
Condensation reaction:
Above-mentioned hydroxymethylation product, under alkaline condition with the acrylamide condensation reaction;
Crosslinking reaction:
Above-mentioned condensation reaction products and linking agent, promotor, initiator effect get jelly shape colloid.
3. the preparation method of a kind of earthwork synthetic material adhesive according to claim 2 is characterized in that, the temperature of polyreaction be 60 ℃～more than 80 ℃, the time is 2h; The temperature of hydroxymethylation is that 40 ℃, pH value are 10, and the reaction times is 2h; The temperature of condensation reaction is that 55 ℃, pH value are 10, and the reaction times is 3h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100124381A CN100567431C (en) | 2007-08-10 | 2007-08-10 | A kind of preparation method of earthwork synthetic material adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100124381A CN100567431C (en) | 2007-08-10 | 2007-08-10 | A kind of preparation method of earthwork synthetic material adhesive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101104783A true CN101104783A (en) | 2008-01-16 |
| CN100567431C CN100567431C (en) | 2009-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100124381A Expired - Fee Related CN100567431C (en) | 2007-08-10 | 2007-08-10 | A kind of preparation method of earthwork synthetic material adhesive |
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| CN (1) | CN100567431C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262151A (en) * | 2019-06-25 | 2019-09-20 | 西安交通大学 | A kind of multi-functional ultraviolet-responsive and shielding smart window and preparation method thereof |
| CN114940883A (en) * | 2022-07-22 | 2022-08-26 | 山东诺尔生物科技有限公司 | Polyacrylamide adhesive and preparation method thereof |
-
2007
- 2007-08-10 CN CNB2007100124381A patent/CN100567431C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110262151A (en) * | 2019-06-25 | 2019-09-20 | 西安交通大学 | A kind of multi-functional ultraviolet-responsive and shielding smart window and preparation method thereof |
| CN114940883A (en) * | 2022-07-22 | 2022-08-26 | 山东诺尔生物科技有限公司 | Polyacrylamide adhesive and preparation method thereof |
| CN114940883B (en) * | 2022-07-22 | 2022-09-23 | 山东诺尔生物科技有限公司 | Polyacrylamide adhesive and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN100567431C (en) | 2009-12-09 |
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Granted publication date: 20091209 Termination date: 20170810 |