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Copolymer, aqueous solution comprising the copolymer and method for reducing negative effects of natural pitch and adhesive contaminants in both pulping and papermaking operations

一种共聚物、水溶液的技术，应用在纺织品和造纸、纸浆的脂肪/树脂/沥青/蜡去除、造纸等方向，能够解决不可能完全去除等问题

Active Publication Date: 2019-09-20
ARCHROMA IP GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adhesives such as recycled coated paper and board stick-on fascia components, hot melt adhesives, self-adhesive labels may not be completely removed despite increased mechanical cleaning effort

Method used

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  • Copolymer, aqueous solution comprising the copolymer and method for reducing negative effects of natural pitch and adhesive contaminants in both pulping and papermaking operations
  • Copolymer, aqueous solution comprising the copolymer and method for reducing negative effects of natural pitch and adhesive contaminants in both pulping and papermaking operations

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Embodiment

[0098] The invention will now be illustrated by way of examples which are to be regarded as illustrative and not as delimiting of the invention. All parts and percentages are by weight unless otherwise indicated to the contrary.

[0099] Glass transition temperature T g Determined experimentally by differential scanning calorimetry.

[0100] The weight average molecular weight is determined by gel permeation chromatography.

[0101] The number (=count) of pitch particles was determined using a Neubauer chamber (hemocytometer). Therefore, pulp samples from various points throughout the pulping and bleaching process were filtered prior to measurement. The filtrate (10 μL) was pipetted onto a hemocytometer grid and examined under a microscope (1000y magnification). The pitch droplet is spherical in shape and exhibits Brownian motion. Count the number of particles in a 0.2 mm square and record the result (by calculation) as per cm 3 quantity.

[0102] The number (=count) of...

Embodiment 2

[0106] Example 2 - Copolymer consisting of styrene / methylstyrene / acrylic acid (copolymer 2 according to the invention)

[0107] 2 moles of styrene were copolymerized with 1 mole of acrylic acid and 1 mole of α-methylstyrene at a temperature of 75°C using a radical initiator. When all the monomers have been converted into copolymer chains, by passing above its glass transition temperature T g The copolymer is kept molten by heating at a temperature of 100°C, then cooled to a temperature below 100°C, and then dissolved in water in the presence of a base to obtain a solution of the copolymer in water and an alkaline medium. The resulting solution had a concentration of 18% by weight of copolymer in water.

[0108] Glass transition temperature T of the copolymer according to Example 2 g is 130°C. The weight average molecular weight is 8000 g / mol.

[0109] The copolymer solutions obtained above were then added to untreated pulp containing soft water (5° to 8° dH) at the concent...

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Abstract

The present invention relates to a copolymer comprising at least one hydrophilic monomer; at least one hydrophobic monomer and at least 10% by weight of methyl styrene, particularly suitable to be used as detackifying agent for reducing negative effects caused by natural pitch and / or adhesive contaminants in both pulping and papermaking operations.

Description

technical field [0001] The present invention relates to a copolymer comprising at least one hydrophilic monomer, at least two hydrophobic monomers, wherein one of the hydrophobic monomers is methyl styrene, said methyl styrene in the copolymer present in an amount of at least 10% by weight, the copolymer is particularly suitable for use as a deblocking agent for reducing the negative effects caused by natural bitumen and / or binder contamination in pulp and papermaking operations. [0002] The copolymers according to the invention can further be used as fixatives for cationic additives in paper formation or in fabric treatment in fiber manufacturing plants, to protect the resulting fabrics from hydrophobic contamination, or in washers and Showering of dense fabrics to prevent the deposition of stickies and maintain porosity. [0003] The present invention also relates to an aqueous copolymer solution comprising a copolymer according to the invention, a method for reducing nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/12C08F220/06D21C9/08D21H21/02C08F212/08D21H17/43
CPCC08F212/08C08F212/12C08F220/06D21C9/08D21H17/43D21H21/02C08F2800/10C08F2800/20D21H23/04
Inventor 约翰·考曼保罗·德科克达米安·朱利安·科尔佩
Owner ARCHROMA IP GMBH