摘要:
Es werden Flockungs- und/oder Fixiermittel für die Papierleimung im schwach sauren bis schwach alkalischen Bereich beschrieben, welche aus einem Gemisch und/oder einem Co-Kondensationsprodukt mit den Komponenten kationisches Dicyandiamidharz und Polyaluminiumhydroxy-Verbindung bestehen. Die erfindungsgemäßen Gemische bzw. Co-Kondensationsprodukte weisen eine bessere Wirkung auf als es von den Einzelkomponenten her zu erwarten gewesen wäre.
摘要:
A cellulose reactive glyoxalated copolymer composition and methods of producing and using the glyoxalated copolymer composition to, for instance, strengthen paper or board are discussed. A glyoxalated copolymer composition includes an aqueous medium containing a glyoxalated copolymer, wherein the glyoxalated copolymer is obtained by reaction in an aqueous reaction medium of a dry weight ratio of glyoxalxationic copolymer. The cationic copolymer can have a weight average molecular weight of about 120,000 to about 1 million Daltons, the cationic copolymer can include diallyldimethylammonium halide monomer and acrylamide monomer, and a ratio a ratio of the weight average molecular weight of the cationic copolymer before glyoxalation to weight % of diallyldimethylammonium halide monomer making up the cationic copolymer before glyoxalation can be equal to or greater than 4,000 or range from 4,000 to 40,000 Daltons/weight %.
摘要:
There is provided a fiberboard, such as a MDF fiberboard or a HDF fiberboard, comprising wood fibers, a binder, and a sludge such as a pulp and a paper sludge. The sludge can be, for example, chosen from a primary pulp and paper sludge, a secondary pulp and paper sludge, a de-inking sludge, and mixtures thereof.
摘要:
A whitening pigment comprising the reaction product of (a) a melamine-formaldehyde and/or a melamine-urea polycondensation product and (b) a water-soluble fluorescent whitening agent of the formula (1), wherein each of the two R1 groups, independent of the other, represents a C1-C6alkyl or C1-C4alkyl-O-C1-C4alkyl residue, which is substituted by one or two -CONH2, -CONHC1-C4alkyl, -COOH, -SO2NH2, -SO2NHC1-C4alkyl or -NH2 groups, each of the two R2 groups, independent of the other, represents hydrogen, C1-C4alkyl, C2-C4hydroxyalkyl or C1-C4alkoxyC1-C4alkyl, or R1 and R2 together with the nitrogen atom complete a piperazine ring, each of the two X1 groups, independently, represent -OH, -OC1-C4alkyl, -Oaryl or the group -NR3R4, wherein R3 and R4 each, independently, represent hydrogen, C1-C4alkyl, C2-C4hydroxyalky, C1-C4alkoxyC1-C4alkyl, a phenyl, phenyl mono- or disulphonic acid residue or, R3 and R4, together with the nitrogen atom to which they are attached, complete a morpholino, piperidino or pyrrolidino ring or, alternatively, X1 represents an amino acid residue from which a hydrogen atom has been abstracted from the amino group and M is hydrogen, an alkaline or alkaline earth metal ion, ammonium, mono- di-, tri- or tetra-substituted C1-C4alkylammonium or C2-C4hydroxyalkylammonium or mixtures thereof, a process for preparation of the pigments and the use thereof for the fluorescent whitening of paper.
摘要:
A microparticle system for use as a retention and drainage aid in the production of alkaline and acid paper products comprises a HMW flocculant polymer (6), an acid colloid (7), and a coagulant or a MMW flocculant (5). The acid colloid (7) comprises an aqueous solution of a water soluble polymer or copolymer of melamine aldehyde, preferably melamine formaldehyde, and is present in an amount ranging between 0.0005 % to 0.5 % by weight based on the dry weight of the solids in the furnish. The HMW flocculant polymer (6) may be added to stock or furnish after the fan pump; and prior to the pressure screen (2); the acid colloid (7) may be added to the stock after the pressure screen (2), and the coagulant/MMW flocculant (5) may be added prior to the fan pump (1). Alternatively, this sequence of chemical additions can be changed, i.e. the acid colloid (7) can be added prior to or after the fan pump (1) or prior to the pressure screen (2). Addition of the microparticle system to the paper furnish improves retention, drainage and sheet formation during the papermaking process.
摘要:
A method for manufacturing a printing paper for decorative boards is provided. The method includes the processes of: applying a resin-containing liquid comprising at least one of a resin and a resin precursor to a base paper for decorative boards; forming a print layer on or in the base paper which is not dried after the resin-containing liquid is applied thereto; and solidifying a liquid contained in the base paper having the print layer.