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    The effect of polyacrylamide

    2012/8/14      view:

        The use of waste paper, in order to keep the paper tensile strength, good performance, to meet the needs of modern printing, use of cationic polyacrylamide (CPAM) fortifier, the molecular length provides good adsorption performance and position combined with chlorine bond, the combination between the fibers increased with enhanced, help a variety of functions, filter aid, especially the tearing index increased, which can effectively improve the paper stresses; used as dispersing agent, can improve the paper.
        The cationic PAM made from the solution of acrylamide into the modifier, sodium hypochlorite and alkali is mainly used as a paper reinforcing agent. Heat resistant water resistant paper is made with PAM type enhancer. For example, 0.5 fatty acid sizing agents, 0.2 PAM type paper enhancers, 1 parts of aluminum sulfate and 0.7 epoxy reinforcement, were added into chemical pulp to make the paper soaked in 1H in 200C water. The tear strength is still 183g, and the printing performance is good.
        Adding acrylamide, acrylic acid and hydroxyethyl acrylate and cassava starch graft copolymer Yang ion into the Canadian standard 560ml beating pulp, adding Al2 (SO4) 3, make quantitative 74.2g/m2 paper, the breaking length is 8950m, the middle layer strength 148g, tear due to sub 135.
        When the speed is 800m/min, the net concentration is 0.6%, and the paper ash is 20%, the retention rate of the first path and the first retention rate of 50% can be reached by using the retention agent of PAM.
    As a unit retention agent, the RETAMINOL C0.1 of BAYER company of America is composed of CPAM, the general addition amount is 0.05%-0.3%, the added concentration is 0.1%-1.0%, the binary retention aid is composed of PEI + PAM, the added amount is 0.2%- 1%, and the concentration is 0.5%-1.5%. The addition method is premixed and then added; the main composition of the series of flocculation retention aids produced by Akzo - Noble company in Sweden is CPAM + colloid silicon. It is suitable for low quantity coated paper, containing waste paper recycling system.
        The particle flocculation system, first joined the CPAM formation of large flocs, under the action of shear stress, dispersed into small floc, and then adding negative particles of colloidal silica, can react with small flocs, with more intensive and more fine flocculation dewatering system, can achieve a higher retention rate, good uniformity and filtration performance. Using cationic PAM as retention aid, the retention rate is 98%. Lignin and fine fiber in the engine pulp and cationic PAM are better than anions, showing strong retention effect. PAM can be modified by rosin, gelatin, filler titanium dioxide and so on, which can be used as wet end additives. The dehydration properties of pulp were improved by PAM. In the manufacturing process, has used alum, ionic PAM and cationic starch to improve the result of retention and dewatering performance. The use of PAM retention aids in printing and printing base paper can improve the retention rate of fillers and fines, speed up dewatering, precipitate sewage and reduce pollution, so it is significant for strengthening environmental protection and improving economic benefits.
        The amphoteric PAM is a highly efficient flocculant, especially for the difficult to treat wastewater. Adding 0.25%-0.5% PAM to pulp can increase the sedimentation speed of the pulp by 60 times, decrease the solid content in white water by 60%, increase the ash content of the pulp, increase the pigment retention rate of clay and increase the turbidity of the white water, and reduce the suspended matter to 50mg/1 below 50mg/1.