Method for controlling stickies deposition in pulp and papermaking process

Abstract

The present invention relates to a method for controlling stickies deposition in pulping and papermaking processes, the method comprising adding to fibrous pulp or paper stock an additive comprising an organomodified siloxane, the organomodified siloxane Oxanes contain units of the formula: [R 1 a Z b SiO (4‑a‑b) / 2 ] n ; where each R 1 independently selected from a hydrogen atom, an alkyl group, an aryl group, an alkenyl group, an aralkyl group, an alkaryl group, an alkoxy group, an alkanoyloxy group, a hydroxyl group, an ester group or an ether group; each Z is independently selected from an amino group , amide, carboxyl, ester or epoxy substituted alkyl, or preferably at least one or more groups-R 2 -(OC p h 2p ) q (OC r h 2r ) s -R 3 ; wherein n is an integer greater than 1; a and b are independently 0, 1, 2 or 3; R 2 is an alkylene group or a direct bond; R 3 is the above for R 1 Or the group defined by Z; p and r are independently an integer of 1 to 6; q and s are independently 0 or 1 <q+s<400成立的整数；并且其中所述有机改性硅氧烷的各个分子含有至少一个基团z。所述有机改性硅氧烷优选是被羟基或烷基封端的线性聚二甲基硅氧烷，其中5～18摩尔％的硅原子被式‑r2‑(OC p h 2p ) q (OC r h 2r ) s -R 3 Z group substitution, wherein p is 2, r is 3, q ​​and s are independently 10 to 20, R 2 is an alkylene group or a direct bond having 1 to 6 carbon atoms, and R 3 It is a hydrogen atom or a hydroxyl group, an alkoxy group, an ester group or an ether group.

Description

technical field [0001] The present invention relates to a method for controlling sticky deposition in pulp and papermaking processes. Background technique [0002] The problems associated with the formation of sticky deposits (comprising both inorganic and organic components) in pulp and papermaking processes are well known. "Pitch", "stickies" and "white-pitch" are terms commonly used for the sticky hydrophobic material produced in these processes that mechanically adheres to surfaces and forms aggregates body. [0003] In pulping processes using virgin fibers, "bitumen" generally refers to a natural resinous hydrophobic material comprising fatty acids, esters and sterols derived from natural raw materials, most often wood. Bitumen is particularly prevalent in the mechanical grade pulps commonly used for recycled paper, where it undergoes hydrolytic degradation and saponification to a lesser extent than the alkaline kraft process used to make chemical pulps. [0004] Pap...

AI Technical Summary

Problems solved by technology

These changes may also limit the types of techniques available to overcome problems caused by stickies deposition

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