摘要:
The present invention relates to a method for the production of bleached wood particles, and to a method for the production of wood materials ranging from light-toned to white, which are produced from the bleached wood particles.
摘要:
A method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTMP), and (b) papers made from wood pulps, with a water-soluble phosphine or a phosphonium compound preferably containing at least one phosphorus hydroxyalkyl bond/linkage, for example a phosphorus hydroxymethyl bond/linkage (P-CH2OH). One example of such a water-soluble phosphine is the commercially available, tris(hydroxymethyl)phosphine (THP), P(CH2OH)3. One example of such a phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl.
摘要:
A method for the bleaching and brightness stabilization of lignocellulosic materials is described. The method involves the treatment of lignocellulosic materials, in particular, (a) wood pulps such as thermomechanical pulps (TMP) and chemithermomechanical pulps (CTMP), and (b) papers made from wood pulps, with a water-soluble phosphine or a phosphonium compound preferably containing at least one phosphorus hydroxyalkyl bond/linkage, for example a phosphorus hydroxymethyl bond/linkage (P-CH2OH). One example of such a water-soluble phosphine is the commercially available, tris(hydroxymethyl)phosphine (THP), P(CH2OH)3. One example of such a phosphonium compound is the commercially available, tetrakis(hydroxymethyl)phosphonium chloride (THPC), [P(CH2OH)4]Cl.
摘要:
Die Erfindung betrifft Abmischungen, bestehend aus Formamidinsulfinsäure, einem insbesondere neutralen oder sauren Belagverhinderer und/oder feinteiliger Kieselsäure mit guter Rieselfähigkeit zur Verwendung zur reduktiven Bleiche in der Papier- und Textilindustrie, wobei insbesondere Polycarboxylate und Polyacrylsäuren mit einem Gehalt von ca. 10 % eines Polyamids in Form eines Copolymerisats eingesetzt werden.
摘要:
Resin can be hydrolyzed enzymatically during the reductive bleaching (e.g. with sodium dithionite) commonly used in pulp manufacture. The enzyme treatment necessitates little or no change of commonly used bleaching conditions.
摘要:
An economical process for producing thiourea dioxide fluid with reduced chemical loss and energy consumption by mixing a combination of thiourea and a peroxide, a combination of thiourea, a peroxide and a reaction catalyst, or a combination of thiourea, a peroxide, a reaction catalyst and a chelating agent in the optional presence of pulp; and a method of bleaching pulp with the thiourea dioxide fluid thus produced.