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Process for manufacture of paper or paperboard and paper or paperboard obtained from this process and use of cationic emulsion polymers in manufacture of paper or paperboard

A cationic polymer, paperboard technology, applied in the field of paper or paperboard, can solve the problems of deposition, concentration, etc., to achieve the effect of enhanced performance, improved dewatering rate, improved retention and/or fixation

Active Publication Date: 2022-03-11
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been observed that these complexes may become concentrated during the process and cause further deposition problems

Method used

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  • Process for manufacture of paper or paperboard and paper or paperboard obtained from this process and use of cationic emulsion polymers in manufacture of paper or paperboard
  • Process for manufacture of paper or paperboard and paper or paperboard obtained from this process and use of cationic emulsion polymers in manufacture of paper or paperboard
  • Process for manufacture of paper or paperboard and paper or paperboard obtained from this process and use of cationic emulsion polymers in manufacture of paper or paperboard

Examples

Experimental program
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preparation example Construction

[0055] The emulsion polymerization procedure involves the preparation of two phases. The aqueous phase contains monomers, crosslinkers and chain transfer agents dissolved in deionized water, as well as other additives known to those skilled in the art, such as stabilizers and pH adjusters. The oil phase comprises a water-insoluble hydrocarbon solution of one or more surfactants. The aqueous and oil phases are then mixed and homogenized in conventional equipment until the particle size is in the range of 1.0 micron and a suitable bulk viscosity is obtained. The emulsion was then transferred to a suitable flask where it was stirred and sparged with nitrogen for about thirty minutes. A polymerization initiator such as sodium metabisulfite solution is then continuously added to the solution to start polymerization. The polymerization is allowed to exotherm to the desired temperature, which is maintained by cooling until cooling is no longer required. The finished emulsion produ...

Embodiment 1

[0087] Example 1: Emulsion polymers as GPAM strength performance enhancers

[0088] Made using 50% bleached hardwood, 50% bleached softwood and 9% PCC filler with a target basis weight of 74g / m 2 Alkaline papermaking handsheets. The pH of the headbox slurry is about 8.3. The following GPAM strength enhancing conditions were evaluated against a control of 2.27 kg / t glyoxalated polyacrylamide (GPAM; Fennobond 3300 (Kemira Oyj)):

[0089] 1) 2.27 dry kg / ton of Fennobond 3300 as a control condition,

[0090] 2) 2.27 dry kg / t Fennobond 3300 and 3.4 dry kg / t anionic polyacrylamide FB85 (Kemira Oyj) as GPAM strength promoters,

[0091] 3) 2.27 dry kg / ton Fennobond 3300, 3.4 dry kg / ton FB85 and 0.9 kg / ton emulsion polymer 677-14B.

[0092] Handsheets were prepared and tested as previously disclosed in Test Methods. The result is as figure 1 shown.

[0093] When the glyoxalated polyacrylamide Fennobond 3300 is used alone, it completely loses its dry and wet strength effect under...

Embodiment 2

[0095] Example 2: Emulsion Polymers as Reinforcers for Anionic Dry Strength Resins

[0096] In this example, the target basis weight for the handsheet was 74 gsm. The fiber furnish is made from standard laboratory pulp containing 50% softwood and 50% hardwood with no added fillers. The pulp was diluted to 0.54% with 150 ppm sulfate ions and 35 ppm calcium ions. The pH of the diluted furnish was 6.9 to 7.1. Anionic Dry Strength The ratio between the anionic polyacrylamide FennoBond 85 (FB85; Kemira Oyj) and the cationic polymer was 3:1 on dry solids basis.

[0097] Handsheets were prepared and tested as disclosed in Test Methods, supra. Polymers and their addition levels and results such as figure 2 shown. Compared with solution cationic polymer (FennoSize E HS plus Kemira Oyj), the emulsion polymer 677-1C according to the present invention provides at 2.25 kg / ton and 4.5 kg / ton respectively anionic polyacrylamide FennoBond 85 (FB85; Kemira Oyj) 11.3% and 13% dry stretch...

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Abstract

A process for making paper or paperboard in which a conversion solution of a cationic polymer is added to a fiber suspension to provide retention enhancement without excessive flocculation of the fibrous feedstock and disruption of paper formation and / or improved drainage and enhance or at least maintain the strength of the paper or paperboard. The conversion solution has a volume viscosity of 50 to 150 mPas at a concentration of 0.2 wt% cationic polymer, and the conversion solution comprises a cationic polymer obtained by inverse emulsion polymerization of a monomer blend comprising a nonionic monomer, 15 to 50 mol% cationic monomer, optionally up to 50 ppm of a cross-linking agent and a chain transfer agent, and converting the resulting cationic polymer inverse emulsion into an aqueous solution.

Description

technical field [0001] The present invention relates to a process for the manufacture of paper or board and an inversion solution comprising an inverse emulsion of a cationic polymer for improving retention and / or in the manufacture of paper and / or board according to the independent claims presented below water filtration purposes. The invention also relates to the paper or board obtained by the method according to the invention. Background technique [0002] Recycled fiber materials are often used as raw material for paper or board. Regenerated fiber materials contain many other substances in addition to fibers. Particulate foreign matter is separated from the pulp in a pulper or in a screen. Some substances naturally remain on the fibers and do not interfere with the process. Other matter, such as stickies, can be separated from the pulp during screening and at least partially removed from the process. [0003] Typically, regenerated fiber material contains starch wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/10D21H11/16D21H17/37D21H17/56D21H21/06D21H21/18D21H21/20D21H23/16D21H23/76
CPCD21H21/10D21H23/16D21H17/375D21H21/06D21H21/18D21H21/20D21H11/16D21H17/56D21H23/765Y02W30/64
Inventor 罗玉萍珍妮弗·赖泽党政陈君华罗纳德·鲁宾逊安德鲁·彭塞克芭芭拉·卢卡西克
Owner KEMIRA OY
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