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Process for sizing paper

A technology of sizing agent and adhesive paper, which is applied in the field of paper sizing, and can solve the problems of aggregation of high-cost sizing agents and other problems

Inactive Publication Date: 2003-11-12
AKZO NOBEL NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased sizing agent addition generally improves sizing, but results in higher cost and increased aggregation of sizing agent in white water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The sizing performance of this method is evaluated by using the cobb 60 test.

[0063] An anionic sizing dispersion containing alkyl ketene dimer, condensed naphthalene sulfonate and di(hydrogenated tallow) dimethyl ammonium chloride was prepared. The sizing dispersion has an AKD content of 30% and contains 4% bis(hydrogenated tallow) dimethyl ammonium chloride and 6% condensed naphthalene sulfonate, based on AKD. The sizing dispersion was added to the raw materials in an amount of 5kg AKD / ton dry raw materials.

[0064] In Test 2, the sizing accelerator contained condensed naphthalene sulfonate (available under the trade name Tamol(R)) and cationic starch with cationic substitution DS 0.065 for nitrogen-containing benzyl groups. In experiment 1, cationic starch without aromatic groups with cationic substitution DS 0.065 and anionic inorganic silica particles provided as a sol, that is, an anionic non-aromatic polymer, were added to the formulation.

[0065] The ingredients...

Embodiment 2

[0069] To evaluate the sizing performance (cobb 60 test), the same anionic sizing dispersion as described in Example 1 and a sizing accelerator containing cationic starch with cationic substitution DS 0.065 for nitrogen-containing benzyl groups and anionic inorganic silica particles were added (Experiment 1); and an accelerator containing condensed naphthalene sulfonate obtained under the trade name Tamol(R), cationic starch with cationic substitution DS 0.065 for nitrogen-containing benzyl groups, and anionic inorganic silica particles (Experiment 2). However, calcium chloride is added to the ingredients to adjust the conductivity to 5000μS / cm, which simulates the raw materials with high conductivity.

[0070] Test №

Embodiment 3

[0072] The sizing performance was evaluated using a cationic sizing dispersion containing 15% alkyl ketene dimer based on AKD, 2% cationic starch, and 0.6% sodium lignosulfonate. The components contained in the sizing accelerator and the added amount of the components can be seen from Table 3, including condensed naphthalene sulfonate, cationic starch with no aromatic group with DS0.065, and DS0.065 containing Aromatic group cationic starch and anionic inorganic silica particles provided as a sol. The raw material used was the raw material of Example 2 obtained by adding calcium chloride to the raw material and having a pH of 8.1 and a conductivity of 5000 μS / cm.

[0073] Test №

[0074] Test №

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PUM

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Abstract

The present invention refers to a process for sizing paper which comprises adding to an aqueous suspension containing cellulosic fibres, and optional fillers, (i) an anionic or cationic sizing dispersion; and (ii) a sizing promoter comprising a cationic organic polymer having one or more aromatic groups, and an anionic polymer having one or more aromatic groups, the anionic polymer being a step-growth polymer, a polysaccharide or a naturally occurring aromatic polymer, forming and draining the obtained suspension, wherein the sizing dispersion and sizing promoter are added separately to the aqueous suspension.

Description

Invention field [0001] The present invention relates to a paper sizing method, which includes adding an anionic or cationic sizing dispersion to a suspension containing cellulose fibers and optional fillers, and a cationic organic containing one or more aromatic groups. Polymers; and sizing accelerators for anionic polymers having one or more aromatic groups, the anionic polymers being gradually growing polymers, polysaccharides or naturally occurring aromatic polymers, the resulting suspension is shaped and Drain water, in which the sizing dispersion and the sizing accelerator are added to the water dispersion separately. Background technique [0002] Sizing agent dispersions or emulsions are used in papermaking to improve the resistance of paper and paperboard to wetting and penetration by various liquids. The sizing dispersion is usually added to an aqueous dispersion containing cellulose fibers, optional fillers and various additives. The water dispersion is fed into the head...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H23/76D21C3/00D21H17/14D21H17/17D21H17/21D21H17/24D21H17/29D21H17/42D21H17/45D21H17/47D21H17/58D21H19/10D21H21/10D21H21/16
CPCD21H23/765D21H21/16D21H17/47D21H17/29
Inventor E·林德格林S·弗罗里奇M·珀森
Owner AKZO NOBEL NV
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