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A METHOD FOR CONTROLLING THE DEPOSITION OF STICKIES IN PULPING AND PAPERMAKING PROCESSES

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  • Title:
    A METHOD FOR CONTROLLING THE DEPOSITION OF STICKIES IN PULPING AND PAPERMAKING PROCESSES
  • Author: Birgit BLASING ; Siegmund FRIDRISCHAK ; Achim SCHENKER ; Bernhard NELLESSEN
  • Subjects: APPARATUS THEREFOR ; IMPREGNATING OR COATING OF PAPER ; PAPER NOT OTHERWISE PROVIDED FOR ; PAPER-MAKING ; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D ; PRODUCTION OF CELLULOSE ; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS ; PULP COMPOSITIONS ; REGENERATION OF PULPING LIQUORS ; TEXTILES ; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
  • Description: A method for controlling the deposition of stickies in pulping and papermaking processes comprises adding to fibre pulp or stock an additive comprising an organo-modified siloxane comprising units of the formula: [R1 aZbSiO(4-a-b) /2]n in which each R1 is independently selected from a hydrogen atom, an alkyl, aryl, alkenyl, aralkyl, alkaryl, alkoxy, alkanoyloxy, hydroxyl, ester or ether group, and each Z is independently selected from an alkyl group substituted with an amine, amide, carboxyl, ester, or epoxy group, or preferably at least one or more groups -R2- (OCpH2p)q (OCrH2r)S-R3; wherein n is an integer greater than 1; a and b are independently 0, 1, 2 or 3; R2 is an alkylene group or a direct bond; R3 is a group as defined for R1 or Z above; p and r are independently an integer from 1 to 6; q and s are independently 0 or an integer such that 1 = q + s = 400; and wherein each molecule of the organo-modified siloxane contains at least one group Z. The organo-modified siloxane is preferably a hydroxyl- or alkyl- endcapped linear polydimethylsiloxane, in which 5 to 18 mole percent of silicon atoms are substituted by Z groups of the formula -R2- (OCpH2p) q (OCrH2r)S-R3, in which p is 2, r is 3 and q and s are independently 10 to 20, R2 is an alkylene group having from 1 to 6 carbon atoms or a direct bond, and R3 is a hydrogen atom or a hydroxyl, alkoxy, ester or ether group. Un método para controlar la deposición de adhesivos en procesos de producción de PASTA y de fabricación de papel comprende adicionar a la pasta o al reservorio de fibras un aditivo que comprende un siloxano con modificación orgánica que comprende unidades de la fórmula: [R1aZbSiO (4-a-b)/2]n en la cual cada R1 se selecciona independientemente entre un átomo de hidrógeno, un grupo alquilo, arilo, alquenilo, aralquilo, alcarilo, alcoxi, alcanoiloxi, hidroxilo, éster o éter, y cada Z se selecciona independientemente de un grupo alquilo sustituido con una amina, amida, carboxilo, éster o epoxi, o preferiblemente al menos uno o más grupos -R2- (OCpH2p)q(OCrH2r)S-R3; en donde n es un número entero mayor que 1; a y b son independientemente 0, 1, 2 ó 3; R2 es un grupo alquileno o un enlace directo; R3 es un grupo como se ha definido para R1 o Z anteriores; p y r son independientemente un número entero de 1 a 6; q y s son independientemente 0 o un número entero tal que 1 = q + s = 400; y en el que cada molécula de siloxano con modificación orgánica contiene al menos un grupo Z. El siloxano con modificación orgánica es preferiblemente un polidimetilsiloxano lineal de con terminación hidroxilo o alquilo, en el que 5 a 18 por ciento en moles de átomos de silicio están sustituidos con grupos Z de la fórmula - R2-(OCpH2p)q(OCrH2r)S-R3, en la que p es 2, r es 3 y q y s son independientemente 10 a 20, R2 es un grupo alquileno que tiene de 1 a 6 átomos de carbono o un enlace directo, y R3 es un átomo de hidrógeno o un grupo hidroxilo, alcoxi, éster o éter.
  • Creation Date: 2017
  • Language: English;Spanish
  • Source: esp@cenet
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