Wet Strength Agent

2026-07-07 15:45

I. Definition

Paper-making additive that improves paper strength when soaked to prevent breakdown, functioning by film formation and crosslinking on fibers for water resistance.

II. Main Types (3 Common Varieties)

  1. PAE (Market mainstream, top recommendation)

    Features: Formaldehyde-free, soft paper, no yellowing, easy repulping, food contact safe
    Applications: Toilet paper, facial tissue, paper cup base paper, food packaging paper
    Dosage: 0.5%–2.0% based on oven-dried pulp


  2. MF Melamine Formaldehyde Resin

    Features: Excellent hot water resistance, superior wet strength; trace formaldehyde, stiff paper, prone to yellowing, hard repulping
    Applications: Industrial filter paper, decorative base paper


  3. UF Urea Formaldehyde Resin

    Features: Low cost, mediocre wet strength, high formaldehyde content
    Applications: Low-grade industrial cardboard (being phased out)


III. Working Mechanism

Cationic molecules adsorb onto fibers to avoid loss;
Heat curing during drying forms water-resistant reticular structure to retain strength and resist water soaking.

IV. Application Tips (For PAE)

Optimal system: Neutral papermaking pH 6.5–8.0
Curing requirement: Dryer temperature ≥95℃
Note: Do not add together with anionic additives, or efficacy will decrease

V. Common Troubleshooting

Insufficient wet strength: Low dryer temperature, insufficient dosage, excessive anionic impurities in pulp
Repulping difficulty: MF hardest to repulp, PAE easiest to handle


声明：此篇为 Shandong Yongsheng Chemical Co., Ltd. 原创文章，转载请标明出处链接： https://www.sdyshx.com/sys-nd/457.html
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