CN101357966B - Method for preparing nano amphoteric polyacrylamide additives - Google Patents
Method for preparing nano amphoteric polyacrylamide additives Download PDFInfo
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- CN101357966B CN101357966B CN2008101984888A CN200810198488A CN101357966B CN 101357966 B CN101357966 B CN 101357966B CN 2008101984888 A CN2008101984888 A CN 2008101984888A CN 200810198488 A CN200810198488 A CN 200810198488A CN 101357966 B CN101357966 B CN 101357966B
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Abstract
The invention discloses a method for preparing a nano-amphoteric polyacrylamide accessory ingredient used for reclaiming sediment in paper making waste. The method comprises the steps as follows: Span80, Tween60, normal butyl alcohol and isooctane are added into a four-opening reaction bulb and are beaten for emulsification. AM, MA and DMDAAC monomers are mixed to get solution; a reducer which issodium bisulfite is added; subsequently, the solution is dropped into the four-opening reaction bulb; when the solution is heated to the initiation temperature, potassium persulfate is dropped; polymerization is initiated under the protection of N2. On completion of the reaction, heating, supply of N2 and beating are stopped; micro-emulsion is poured into an excessive dose of acetone for emulsionbreaking and settlement; the solution is filtered, washed with acetone and dried, thus getting the product; the product is preserved in a sealed container. The method solves the problems of the interference of small quantity of fiber remaining in the sediment of paper making waste, poor paper strength, anion waste on papermaking wet ends. By adopting the method, the sediment can be reclaimed and used in production as a paper making raw material. In addition, the method eliminates the secondary pollution caused by the sediment resulting from the traditional paper making waste processing technology.
Description
Technical field
The present invention relates to the polymer chemistry synthetic technology, be specifically related to a kind of preparation method who is used for the nano amphoteric polyacrylamide additives of waste paper making wastewater sediment recycling
Background technology
Paper industry is important component part in the national economy.Since nineteen ninety-two, the paper of China's paper industry and paperboard production, aggregate consumption Jun Ju third place in the world, the paper industry development is rapidly.But waste paper making wastewater is handled in materialization can produce a large amount of papermaking sediments, and the characteristics of this class sediment are: 1. water content height (more than 60%), be the mud state, the composition complexity is behind the taper sand cleaning machine, it consists of fiber and accounts for 74%, and tiny mineral filler accounts for 18%, and other inorganic component accounts for 8%.2. wherein certain damage has all taken place in the physicals of institute's fibre-bearing and structure, fiber exists shortcomings such as fiber weak point, intensity difference, difficult drainage, foreign matter content height, be difficult to adapt to manufacturing paper with pulp of current high-speed paper machine, have a large amount of anionic impurities in the sediment simultaneously, these all can influence manufacturing paper with pulp and paper properties of page in many ways.
How the papermaking sediment being carried out harmlessness disposing and comprehensive utilization cost-effectively, can utilize the waste of resource and environment is worked the mischief avoiding, is a urgent and important job that is faced in China's paper industry and the current environmental protection field.At present only take simple stacking, landfill and burning for the sediment major part in the waste paper making wastewater, not only expend fund, land occupation is not recycled resource, and soil, underground water and air are all caused secondary pollution.If the sediment in these waste paper making wastewaters is back to production as paper making raw material, then can reduce the usage quantity of thallophyta fibrous material, eliminate the secondary pollution that sediment that traditional wastewater processing technology produces causes simultaneously, realize the purpose that the regenerated papermaking industry energy-saving reduces discharging.
Because of the total charge content of sediment is 18.62mmol/100g, surface charge content is 6.11mmol/100g, and the negatively charged ion demand is 0.1871meq/g, and cationic demand is 0.251meq/g; Less than the tiny ingredients constitute 32.01% of 100 purposes, the filler particles particle diameter is generally at 0.1-10 μ m in the sediment, and particle diameters such as all the other primitive fibers, non-fiber subtitle substance, soluble polymer are all less than 1-2 μ m, and its specific surface area is about 0.6-600m
2/ g, and wherein tiny component can make slurry be colloidal state on the whole when recycling sediment in a large number, mutual surface action and colloid action occupy critical role, traditional paper making additive can't satisfy its high yin, yang ionic demand and requirement little to the auxiliary agent granularity, that specific surface area is big thereof, big and the poor effect of addition is recycled sediment cost height.Synthetic a kind of paper making additive that is applicable to that sediment is recycled in the waste paper making wastewater, it is significant for the recycling problem that realizes pollutent in the paper waste to solve the paper properties decline problem that causes because of fiber reuse in the sediment.
Summary of the invention
The present invention is in order to overcome the problem and shortage that prior art exists, provide the nano level amphoteric polyacrylamide additives preparation method who is applicable to that sediment is recycled in the waste paper making wastewater.
The present invention can be achieved by the following technical programs: be applicable to that the nano level amphoteric polyacrylamide additives preparation method that sediment is recycled in the waste paper making wastewater may further comprise the steps:
(1) in beaker, acrylamide, toxilic acid and three kinds of monomers mixing of dimethyl diallyl ammonium chloride are made into the aqueous solution, regulate pH value to 6.0-7.0 with ammoniacal liquor, and in the aqueous solution, add the reductive agent sodium bisulfite;
(2) in the four-hole boiling flask that agitator, reflux condensing tube, logical nitrogen pipe and thermometer are housed, add compound emulsifying agent, propyl carbinol and the octane-iso that sorbitan monooleate and polyoxyethylene sorbitol acid anhydride stearate are formed, stirring and emulsifying, drips of solution in the beaker is added in the four-hole boiling flask, be heated to 40-60 ℃, add the oxygenant Potassium Persulphate, and at N
2Protection under initiated polymerization, sealing reacts, and adds sodium acetate, anhydrous;
(3) after reaction finishes, stop heating and stirring and stop logical N
2, pour the emulsion in the four-hole boiling flask in acetone breakdown of emulsion precipitation, to filter, washing precipitation places baking oven to be dried to constant weight throw out then, and the products obtained therefrom sealing is preserved.
Described Oxidizing and Reducing Agents consumption is identical, is equivalent to the 1.5-3% of aqueous solution quality.
The described three kinds of monomer blended mol ratios of step (1) are acrylamide: toxilic acid: dimethyl diallyl ammonium chloride=50:30:20; The concentration of the described aqueous solution is the 50-55% quality.
The 20-30% quality that the described composite emulsifying agent content of step (2) is an octane-iso; The mass ratio of described sorbitan monooleate and polyoxyethylene sorbitol acid anhydride stearate is 3:7-1:1; Described propyl carbinol and compound emulsifying agent mass ratio are 1:7-1:5; The described aqueous solution and octane-iso mass ratio are 1:3-1:1.
The described stirring and emulsifying time of step (2) is 20-30min, and stirring velocity is 150-300r/min; The sealed reaction time is 2-4h; Solution in the beaker is controlled at 15-25min to be added drop-wise in the four-hole boiling flask; 25-35min dropping oxidizing agent Potassium Persulphate is to four-hole boiling flask; The amount of sodium acetate, anhydrous is the 3-5% of octane-iso.
The described washing precipitation of step (3) is to use washing with acetone throw out 3 times; Drying temperature is 55-65 ℃; The product cut size scope is 20-40nm.
Reaction principle of the present invention:
Monomer (AM+DMDAAC+MA) mixes the unit molecule interface that the aqueous solution be made into formed by compound emulsifying agent and cosurfactant propyl carbinol and surrounds, be scattered in the oil phase octane-iso and form the little pond of nanometer, the composite initiator that Oxidizing and Reducing Agents is formed spreads in the micro emulsion liquid phase, seeing through the tensio-active agent rete permeates in the micro emulsion drop, initiated polymerization in the micro emulsion drop, produce nucleus and growth, and then obtain nanoparticle.
The chemical reaction that takes place is as follows:
Compared with prior art, the present invention has the following advantages:
(1) the present invention is applicable to that the nano level amphoteric polyacrylamide additives preparation method that sediment is recycled in the waste paper making wastewater is not as the synthetic amphiprotic polyacrylamide particulate of traditional two-step approach, but adopt the synthetic amphiprotic polyacrylamide nanoparticle of single stage method, promptly adopt K
2S
2O
8(Potassium Persulphate)/NaHSO
3(sodium bisulfite) is composite initiation system, selecting environmentally friendly tensio-active agent Span80 (sorbitan monooleate) and Tween60 (polyoxyethylene sorbitol acid anhydride stearate) for use is emulsifying agent, propyl carbinol is an assistant for emulsifying agent, the octane-iso that environment is not had harm is a continuum, to acrylamide (AM), dimethyl diallyl ammonium chloride (DMDAAC) and toxilic acid (MA) carry out Ternary Reversed Phase Micro Emulsion Copolymerization and close, prepared the amphiprotic polyacrylamide nanoparticle, particle size range is 20-40nm, and the gained nanoparticle is better dispersed, substantially do not have agglomeration, can give full play to the activity of nanoparticle.Have that experimental installation is simple relatively, processing ease, size of particles are controlled, narrow diameter distribution, be easy to realize advantage such as continuous industry production.
(2) institute of the present invention synthetic nano level amphoteric polyacrylamide additives is big at fiber yin, yang ionic demand in the sediment, characteristics that tiny component concentration the is high and method that adopts Reversed Phase Micro Emulsion Copolymerization to close is synthetic.The amphiprotic polyacrylamide nano material, specific surface area is big, the amide group (CONH on its macromolecular chain
2) easily with sediment in a large amount of hydroxyls (OH) formation hydrogen bond of exposing on the fiber, cationic functional group on the macromolecular chain is easy to directly and the negative charge on the fiber forms ionic linkage, and anionic functional group is easy to by ligand complex and system middle-jiao yang, function of the spleen and stomach ionic bond, form coordinate bond with fiber, and make the enhancing that interweaves mutually between the fiber.Be lower than the addition of ordinary particle level amphiprotic polyacrylamide, the own character of fiber retention, water filtering performance, fiber, structure and paper properties thereof in the sediment all can well be improved.This is applied to industrial production and has great importance for the cost recovery that reduces fiber in the sediment.
(3) institute of the present invention synthetic nano level amphoteric polyacrylamide additives has been realized the sediment in the waste paper making wastewater is back to the purpose of production as paper making raw material, has solved the paper properties decline problem that causes because of fiber reuse in the sediment.With proportioning is that 30% sediment and 70% OCC paper waste mix, and adds (to oven dry stock) behind 0.4 ‰ the nano level amphoteric polyacrylamide additives the quantitative 8.8g/m that increased of cardboard
2, and the fracture length of paper is increased to 3.46km, and ring crush index is increased to 3.91Nm/g, and burst index is increased to 2.98kPam
2/ g, beating degree drops to 26 ° of SR, can make the fracture length of paper and quantitatively improve 16.5% and 7.5% respectively, and slurry sample beating degree reduces by 13.3%, and ring crush index increases by 31.65%, and burst index increases by 9.96%.
Embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described in detail.
Embodiment 1
Be AM:MA:DMDAAC=50:30:20 with AM, MA and three kinds of monomers of DMDAAC according to mol ratio in beaker, be configured to the 100g aqueous solution, concentration is 50% quality, regulates pH value to 6.0 with ammoniacal liquor, and adds 1.5g reductive agent sodium bisulfite in the aqueous solution.
In the four-hole boiling flask that agitator, reflux condensing tube, logical nitrogen pipe and thermometer are housed, add compound emulsifying agent, 6.7g propyl carbinol and 200g octane-iso that 16g Span80 and 24gTween60 form, stirring velocity is 150r/min, stirring and emulsifying 30min feeds nitrogen simultaneously.
The solution period in the beaker is added drop-wise in the four-hole boiling flask at 20min, is heated to 50 ℃ of temperature of reaction, period 30min drips 1.5g oxygenant Potassium Persulphate in four-hole boiling flask, and at N
2Protection under initiated polymerization, the sealing 3h that reacts adds the 8g sodium acetate, anhydrous.
After reaction finishes, stop heating and stirring and stop logical N
2, pour the emulsion in the four-hole boiling flask in acetone breakdown of emulsion precipitation, filter, use washing with acetone 3 times, then throw out is placed baking oven to be dried to constant weight for 60 ℃, the products obtained therefrom particle size range is at 20-40nm, and the product sealing is preserved.
Embodiment 2
Be AM:MA:DMDAAC=50:30:20 with AM, MA and three kinds of monomers of DMDAAC according to mol ratio in beaker, be configured to the 100g aqueous solution, concentration is 55% quality, regulates pH value to 7.0 with ammoniacal liquor, and adds 2g reductive agent sodium bisulfite in the aqueous solution.
In the four-hole boiling flask that agitator, reflux condensing tube, logical nitrogen pipe and thermometer are housed, add compound emulsifying agent, 10.7g propyl carbinol and 300 octane-iso that 22.5g Span80 and 52.5g Tween60 form, stirring velocity is 300r/min, stirring and emulsifying 20min feeds nitrogen simultaneously.
Solution period 15min in the beaker is added drop-wise in the four-hole boiling flask, continues to stir and feed N
2, being heated to 40 ℃ of temperature of reaction, period 25min drips 2g oxygenant Potassium Persulphate in four-hole boiling flask, and at N
2Protection under initiated polymerization, the sealing 2h that reacts adds the 15g sodium acetate, anhydrous.
After reaction finishes, stop heating and stirring and stop logical N
2, pour the emulsion in the four-hole boiling flask in acetone breakdown of emulsion precipitation, filter, use washing with acetone 3 times, then throw out is placed baking oven to be dried to constant weight for 55 ℃, the products obtained therefrom particle size range is at 20-40nm, and the product sealing is preserved.
Embodiment 3
Be AM:MA:DMDAAC=50:30:20 with AM, MA and three kinds of monomers of DMDAAC according to mol ratio in beaker, be configured to the 100g aqueous solution, concentration is 55% quality, regulates pH value to 7.0 with ammoniacal liquor, and adds 3g reductive agent sodium bisulfite in the aqueous solution.
In the four-hole boiling flask that agitator, reflux condensing tube, logical nitrogen pipe and thermometer are housed, add compound emulsifying agent, 6g propyl carbinol and 100 octane-iso that 15g Span80 and 15gTween60 form, stirring velocity is 200r/min, stirring and emulsifying 25min feeds nitrogen simultaneously.
Solution period 25min in the beaker is added drop-wise in the four-hole boiling flask, continues to stir and feed N
2, being heated to 60 ℃ of temperature of reaction, period 35min drips 3g oxygenant Potassium Persulphate in four-hole boiling flask, and at N
2Protection under initiated polymerization, the sealing 4h that reacts adds the 3g sodium acetate, anhydrous.
After reaction finishes, stop heating and stirring and stop logical N
2, pour the emulsion in the four-hole boiling flask in acetone breakdown of emulsion precipitation, filter, use washing with acetone 3 times, then throw out is placed baking oven to be dried to constant weight for 65 ℃, the products obtained therefrom particle size range is at 20-40nm, and the product sealing is preserved.
For the nano level amphoteric polyacrylamide additives paper making additive excellent performance more commonly used that uses the inventive method preparation is described, the special product that adopts embodiment 1 is done a series of experiments.
Table 1 nano level amphoteric polyacrylamide additives is to the enhancing retention aid and filter aid effect of the mixed pulp of sediment and OCC paper waste
Annotate: sediment and OCC waste paper magma mass ratio are 3:7, and using PFI paste roller mill making beating slurry dense is 15%.
Sediment is taken from the sediment after the one-level materialization of Dongguan OCC (fluting board) regenerated papermaking factory is handled, data from table 1 proportioning as can be seen are that 30% sediment and 70% OCC paper waste mix, nano level amphoteric polyacrylamide additives consumption is 0.4 ‰ o'clock (to an oven dry stock), the quantitative 8.8g/m that increased of cardboard
2, and the fracture length of paper is increased to 3.46km, and ring crush index is increased to 3.91Nm/g, and burst index is increased to 2.98kPam
2/ g, beating degree drops to 26 ° of SR, can make the fracture length of paper and quantitatively improve 16.5% and 7.5% respectively, and slurry sample beating degree reduces by 13.3%, and ring crush index increases by 31.65%, and burst index increases by 9.96%.
The mixed pulp of same sediment and OCC paper waste effect comparison after the processing of synthetic nano level amphoteric polyacrylamide additives of the present invention and paper making additive commonly used in the market sees Table 2.
The different paper making additives of table 2 are to the enhancing retention and drainage effect contrast of the mixed pulp of sediment and OCC paper waste
Annotate: above pattern all makes under the experiment condition of best promoter addition (to oven dry stock); Sediment and OCC waste paper magma mass ratio are 3:7, and using the making beating of PFI paste roller mill is 15% o'clock mensuration beating degree to starching dense
Data from table 2 are compared with paper making additive commonly used in the market as can be seen, adopt synthetic nano level amphoteric polyacrylamide additives of the present invention to be issued to better retention aid and filter aid reinforced effects in the few situation of addition, solve the paper properties decline problem that causes because of fiber reuse in the sediment, realized the recycling of pollutent in the paper waste.
The cost comparing result that the paper making additive that adopts the nano level amphoteric polyacrylamide additives of the present invention's preparation and use always is in the market recycled sediment in the waste paper making wastewater sees Table 3.
The different paper making additives of table 3 are handled sediment per ton (calculating with oven-dry weight) cost analysis
As can be seen from the above results: compare with paper making additive commonly used in the market, after handling by present technique synthetic nano amphoteric polyacrylamide, fiber retention in the sediment, water filtering performance, the character of fiber own, structure and paper properties thereof all can well be improved, decay of fibrous texture performance and retention are low in the solution sediment, paper strength is poor, anionic trash in the sediment produces problems such as interference to paper making wet part, make after treatment sediment can be used as paper making raw material and be back to production, realize the recycling of pollutent in the paper waste, eliminate the secondary pollution that sediment that traditional wastewater processing technology produces causes simultaneously, realized the purpose that the regenerated papermaking industry energy-saving reduces discharging well, and working cost is compared also not high with paper making additive commonly used in the market, has good economic benefit, environmental benefit and social benefit have the wide market outlook of applying.
Claims (6)
1. the preparation method of a nano amphoteric polyacrylamide additives may further comprise the steps:
(1) in beaker, acrylamide, toxilic acid and three kinds of monomers mixing of dimethyl diallyl ammonium chloride are made into the aqueous solution, regulate the pH value to 6.0-7.0 with ammoniacal liquor, and in the aqueous solution, add the reductive agent sodium bisulfite;
(2) in the four-hole boiling flask that agitator, reflux condensing tube, logical nitrogen pipe and thermometer are housed, add compound emulsifying agent, propyl carbinol and the octane-iso that sorbitan mono-oleic acid ester and polyoxyethylene sorbitol acid anhydride stearate are formed, stirring and emulsifying, drips of solution in the beaker is added in the four-hole boiling flask, be heated to 40-60 ℃, add the oxygenant Potassium Persulphate, and at N
2Protection under initiated polymerization, sealing reacts, and adds sodium acetate, anhydrous;
(3) after reaction finishes, stop heating and stirring and stop logical N
2, pour the emulsion in the four-hole boiling flask in acetone breakdown of emulsion precipitation, to filter, washing precipitation places baking oven to be dried to constant weight throw out then, and the products obtained therefrom sealing is preserved.
2. preparation method according to claim 1 is characterized in that: described Oxidizing and Reducing Agents consumption is identical, is equivalent to the 1.5-3% of aqueous solution quality.
3. preparation method according to claim 1 is characterized in that: the described three kinds of monomer blended mol ratios of step (1) are acrylamide: toxilic acid: dimethyl diallyl ammonium chloride=50: 30: 20;
The concentration of the described aqueous solution is the 50-55% quality.
4. preparation method according to claim 1 is characterized in that: the 20-30% quality that the described composite emulsifying agent content of step (2) is an octane-iso;
The mass ratio of described sorbitan mono-oleic acid ester and polyoxyethylene sorbitol acid anhydride stearate is 3: 7-1: 1; Described propyl carbinol and compound emulsifying agent mass ratio are 1: 7-1: 5;
The described aqueous solution and octane-iso mass ratio are 1: 3-1: 1.
5. preparation method according to claim 1 is characterized in that: the described stirring and emulsifying time of step (2) is 20-30min, and stirring velocity is 150-300r/min; The sealed reaction time is 2-4h; Solution in the beaker is controlled at 15-25min to be added drop-wise in the four-hole boiling flask; 25-35min dropping oxidizing agent Potassium Persulphate is to four-hole boiling flask; The amount of sodium acetate, anhydrous is the 3-5% of octane-iso.
6. preparation method according to claim 1 is characterized in that: the described washing precipitation of step (3) is to use washing with acetone throw out 3 times; Drying temperature is 55-65 ℃; The product cut size scope is 20-40nm.
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|---|---|---|---|
| CN2008101984888A CN101357966B (en) | 2008-09-12 | 2008-09-12 | Method for preparing nano amphoteric polyacrylamide additives |
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| CN101357966B true CN101357966B (en) | 2010-10-27 |
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| CN102674521B (en) * | 2012-06-10 | 2013-11-06 | 四川师范大学 | Organic amphiprotic high-molecular coagulant and preparation method thereof |
| CN104558405B (en) * | 2015-01-14 | 2016-08-17 | 中北大学 | A kind of preparation method of amphiprotic polyacrylamide |
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Assignee: Chengdu Tiantian Paper Co., Ltd. Assignor: South China University of Technology Contract record no.: 2011440000643 Denomination of invention: Method for preparing nano amphoteric polyacrylamide additives Granted publication date: 20101027 License type: Exclusive License Open date: 20090204 Record date: 20110712 |
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