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Synthesis of Star Polymer and Its Application in the Papermaking Wet-end

Author: ZhaoYanFeng
Tutor: FuYingJuan
School: Shandong Institute of Light Industry
Course: Pulp and Paper Engineering
Keywords: Of dendritic polyamide - amine Acryloyl chloride Star cationic polyacrylamide Waste newsprint deinking pulp Retention and drainage Relative evenness index
CLC: TS727
Type: Master's thesis
Year: 2010
Downloads: 79
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Abstract

In recent years, with the papermaking wet end of the papermaking system by acidic into alkaline system, the paper added to fill in the amount of increase and quantitatively reduce the closed loop of white water systems is increasing, and the fiber back with proportional increase requirements adopted retention and drainage aids not only to ensure that the paper stock higher retention, better filtration performance and better into paper evenness, but also have the ability to resist high shear. A star polymer as hyperbranched polymers, surface functional high, compared with a linear polymer of the same molecular weight, having a bulk and solution viscosity is low, the smaller the radius of the fluid dynamics characteristics. Is expected to become a new type of multi-functional paper chemicals, play a good role in the increasing complexity of the wet end. Papers a multi-arm star polymers synthesized by molecular design \First terminal amino the whole generation dendrimer polyamide - amine macromolecules (PAMAM) with acryloyl chloride (AC) reaction, the end groups synthesized as more double bonds of the new multi the dendrimer large monomer (PAMAM-to-AC). The study shows that the most suitable conditions of the synthesis: N'N dimethyl formamide (DMF) as the solvent and triethylamine as acid binding agent, the ratio of reactants (PAMAM: AC) is 1:1.5, the first low temperature ( -5 to 5 ° C) and the reaction period of time, and then the reaction was continued at room temperature, the reaction time of 6 h. Its structure was characterized by IR and NMR. Then, to the PAMAM-AC for the nuclear, S2O82 - HSO3-redox initiator system, the initiator in the aqueous solution of propylene amide (AM), acryloyloxyethyl trimethyl ammonium chloride (DAC) to radical copolymerization, prepared The star-shaped structure of the cationic polyacrylamide (S-CPAM). And the copolymer product infrared spectrum analysis. The radical polymerization reaction system and polymerization process conditions of the quality of the target product obtained S-CPAM optimum synthesis conditions were as follows: The total monomer concentration of 15% (mass ratio of the total solution, wherein the AM: DAC 7: 1), the initiator concentration 0.3% (mass ratio of the total concentration of the monomer, wherein the oxidizing agent with a reducing agent ratio of 2:1), the reaction temperature is 40 ° C, reaction time 4 h. Studied under different conditions, S-CPAM retention and drainage aid of bleaching waste news pulp and talc filler flocculation mechanism. The results show that, S-CPAM mainly bridging mechanism triggered flocculation between the slurry. Relative molecular mass and positive charge density on the effect of S-CPAM. The higher the relative molecular mass, the better the S-of CPAM of retention and drainage. With the improvement of the positive charge density, S-of CPAM's help retention and drainage function enhancements, but when the positive charge density of more than 2.12 meq? G-1, the retention and drainage effect increase marginally. With the increase of the amount of S-CPAM, the Zeta potential of the slurry (negative value) is gradually reduced, the significant improvement of the retention and drainage properties of the paper materials. With the enhancement of the shearing action in the action time and the system, showed a decreasing tendency of the retention and drainage properties of the paper materials. S-CPAM shear. With the rise of pH value of the slurry system, showed a decreasing trend of retention and drainage properties of the paper material. S-CPAM, alkaline system showed better help retention and drainage effect. S-CPAM the bentonite composition of particulate retention and drainage system can further improve the retention of paper materials, has better filter aid, and shearing has a better ability to resist. Be used to improve the bonding between the sheets fiber, not only to improve the relative evenness index into the paper, and further ensure the strength properties of the sheet.

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