Amphoteric cationic polymers for controlling deposition of pitch and stickies in papermaking

Inactive Publication Date: 2006-01-05
CIBA SPECIALTY CHEM WATER TRATMENTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0052] The present inventors have discovered that a cationic amphoteric DADMAC polymer with a ratio of cationic charge to anionic charge greater t

Problems solved by technology

Homopolymers of DADMAC and polyamines with high cationic charge density are good for neutralizing anionic trash but have limited success for controlling pitch and stickies deposition.
Pitch and stickies are interfering substances in the wet end of papermaking that can affect both the machine runnability and paper quality.
Deposition of pitch and stickies often leads to defects in the finished product and paper machine downtime causing lost profits for the mill.
These problems become more significant when paper mills “close up” their process water systems for conservation and environmental reasons.
Unless the pitch and stickies are continuously removed from the system in a controlled manner, these interfering substances will accumulate and eventually lead to deposition and runnability problems.
These methods are, however, not commonly used together since they may conflict with each other.
However, pitch adsorbents such as talc can end up contributing to the pitch deposit p

Method used

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  • Amphoteric cationic polymers for controlling deposition of pitch and stickies in papermaking
  • Amphoteric cationic polymers for controlling deposition of pitch and stickies in papermaking
  • Amphoteric cationic polymers for controlling deposition of pitch and stickies in papermaking

Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of Amphoteric DADMAC Polymers 1-10 and DADMAC homopolymer Control

[0100] The procedure for making Polymer 1 is described in this example. Other polymers are made following the same procedure, but using different monomer ratios, initiator feeds and temperature to obtain polymers with different compositions and molecular weights. Molecular weights of the polymers are measured using the bulk viscosity or Brookfield viscosity (BV) at 20% polymer solids. A high 20% BV value indicates a high MW. Properties of the polymers synthesized are shown in Table 1.

[0101] A 1-liter reactor equipped with a condenser, a thermometer, a nitrogen inlet, and an overhead agitator is charged with 453.86 g of 66% monomer DADMAC, 15.8 g of acrylic acid, 59 g of deionized water and 0.15 g of Versene (Na4EDTA). 35 g of a 25% NaOH solution is added slowly to the reactor at room temperature to neutralize the acrylic acid. The polymerization mixture is purged with nitrogen and heated with agitation to a...

example 2

[0113] The samples tested in this example all have a relatively low molecular weight expressed by the 20% BV of about 400 cps. Testing is performed on 100% recycled old corrugated container (OCC) furnish from a linerboard mill experiencing serious stickies deposit problem. This example shows that with similar MW, the amphoteric DADMAC copolymer Polymer 1 performs better in the turbidity reduction than the DADMAC homopolymer control. Results in Table 2B for the Control, Polymer 1 and Polymer 2, demonstrate that the performance improvement with incorporation of the AA anionic component is diminished when the M content is above 10%.

TABLE 2B100% recycled Old Corrugated Container(OCC) furnishblank Turbidity, 379 NTUDosage, kg / ton1.02.05.0Turbidity, NTUControl 1 (homopolymer 0% AA)574943Polymer 1 (5% AA)574639Polymer 2 (10% AA)605442

example 3

[0114] The samples tested in this example all have a higher molecular weight expressed by the 20% BV of above 600 cps. Testing is performed on 100% recycle deinked pulp furnish from a paper mill. This example further demonstrates that the performance improvement with incorporation of AA anionic component is diminished when the AA content is above 10%. See Table 3A. A commercial fixative (Alcofix 159, a medium MW polyamine) commonly used for deposit control in paper mills is also included in the testing. Polymer 3 of the present invention gives significantly better performance in turbidity reduction than the commercial fixatives.

TABLE 3A100% recycled furnish deinked pulp (DIP)furnishblank turbidity, 578 NTUDosage, kg / ton0.20.40.8Turbidity, NTUCommercial fixative (Alcofix 159)1267350Polymer 3 (5% AA)996341Polymer 4 (10% AA)17610449Polymer 5 (20% AA)14910551Polymer 6 (40% AA)15910150

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Abstract

The present invention relates to a method and composition for controlling pitch and stickies deposit in a pulp and papermaking process using amphoteric copolymers of diallyldimethylammonium chloride (DADMAC) with acrylic acid and/or acrylamide and optionally a siliceous material.

Description

[0001] This application claims the benefit of Provisional Application No. 60 / 585,184, filed Jul. 2, 2004 and Provisional Application No. 60 / 662,755, filed Mar. 17, 2005.[0002] The present invention relates to a method for controlling pitch and stickies deposition in a pulp and papermaking process using amphoteric copolymers formed from the monomers diallyldimethylammonium chloride (DADMAC), acrylic acid and optionally acrylamide. The method may optionally further comprise the addition of a siliceous material. The pitch and stickies are found in mechanical pulps, recycled fiber, coated broke, white water and the like. The invention also encompasses a composition for pitch and stickies control in papermaking comprising the amphoteric copolymer and optionally, a siliceous material. BACKGROUND OF THE INVENTION [0003] The present invention is directed to the use of amphoteric copolymers or terpolymers of diallyldimethylammonium chloride (DADMAC) with acrylic acid and optionally acrylamid...

Claims

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Application Information

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IPC IPC(8): D21H21/02D21H17/45
CPCD21H17/37D21H17/45D21H17/54D21H23/76D21H17/68D21H17/74D21H21/02D21H17/55
Inventor SONG, ZHIQIANGFORD, PHILIP A.ROY, VINCENT F.GRIMSLEY, SWINDELL A.SATCHER, KENNETH W.BLAZEY, MATTHEW A.PELBOIS, ROBERT
Owner CIBA SPECIALTY CHEM WATER TRATMENTS
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