Dry Strength Agent
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HiBind Series

Dry-Strength Agents

Dry strength is an inherent structural property of a paper sheet which is due primarily to the development of fiber to fiber bonds during consolidation and drying of the fiber network. Paper strength is dependent on the strength of individual fibers, the strength of interfiber bonds, the number of bonds (bonded area) and the distribution of fibers and bonds (formation). Paper strength additives may bring about improvement in one or more of the above factors, although it may be assumed that they are unlikely to affect the strength of single fibers.

Certain chemical additives, when introduced into the furnish prior to paper formation, constitute an alternative method to beating for generating paper strength, whilst maintaining other important property combinations. Dry strength additives are usually water soluble, hydrophilic natural and synthetic polymers. The commercially most important are cationic starch and acrylamide polymers. HiBind series are polyacrylamide derivatives (PAMs). The PAMs are one of the oldest and still most commonly used additives today applied for strengthening fiber bonding in paper. Depending on molecular weight and the nature and amount of charge-bearing copolymers or substituents, they have found many and varied applications (Fig. 1). The practical molecular weight range is between 100,000 and 500,000 daltons. Anionic and cationic substitution is typically between 5 and 20 mole % with respect to the amide group.

We have two dry-strength additives (Hibind series) as follow:

Hibind-KSK : Cationic polyacrylamides
Hibind-TAP : Anionic polyacrylamides.
Hibind-AM : Amphoteric polyacrylamides.

The purpose of HiCat series is to avoid the cationic functional chemicals like a cationic starch to be caught by the colloids (instead of reacting with the fibers). The addition of a low molecular weight, highly cationic polymer enables the neutralization and blocking of the anionic trash and allows the cationic starch to be fixed onto the fibers. In this way the physical properties of the resultant paper are improved.

In this case, liquid polymers such as HiCat series are the most effective as anionic trash catcher. With HiCat, the fixation of cationic functional polymers is easier on the fiber when the anionic compounds present in the papermaking system. ‘Charge neutralization flocculation’ is basically a special case of the patch-charge model. It can be explained that the electrical charge at the interface will be cancelled out by ion exchange with polycations in stoichiometric proportions, and flocculation comes about by means of Van der Waals forces between uncharged particles. This mechanism is plausible in situations in which a polycationic compound forms a nonionic polyelectrolyte complex with a polyanionic species. Therefore, HiCat series, which has low molecular weight with high ationic charge density, helps to the fast dewatering of water by flocculation through the charge neutralization.

1. Typical Properties

Appearance Transparent
Active content(%) 10.5 – 11.5 13.0 - 14.0 19.0 - 21.0 14.5 - 15.5
Bulk Viscosity(25℃,cps) 9,000 – 15,000 < 10,000 < 12,000 > 12,000
Specific gravity(Ave.) 1.02 - 1.04 1.03 - 1.05 1.020 - 1.080 1.020 - 1.080
pH 3.5 - 4.5 7.0 – 9.0 3.0 – 5.0 3.0 – 5.0
Ionic charge Cationic Anionic Amphoteric Amphoteric
Shelf life(months) 6 6 6 6

2. Packaging

Pails Drums Tote Bins Other sizes
20 kg 200 kg 1,000 kg -

3. Health and Safety

Safety glasses and gloves are recommended to handle the products. If your eyes are exposed to the products, rinse immediately with plenty of fresh water for at least 10 minutes.

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