DRY PAPER STRENGTH RESINS
Paint chemicals 2025-03-21
Polyacrylamide resins are suitable for near-neutral papermaking conditions. The resins can be set only with a small amount of alum complex. Dry paper strength resins can improve selected paper properties, including the bursting strength and ring crush strength.
Dry Paper Strength Resins: Overview and Key Properties
| Category | Details |
|---|---|
| Chemical Type | Synthetic polymers (e.g., polyamide-epichlorohydrin, glyoxalated polyacrylamide) |
| Function | Improve dry tensile, burst, and tear strength of paper |
| Appearance | Viscous liquid or powder (varies by type) |
| Ionic Charge | Cationic (for better fiber bonding) |
Common Resin Types & Properties
| Resin Type | Key Characteristics | Optimal pH Range |
|---|---|---|
| PAE (Polyamide-Epichlorohydrin) | Wet/dry strength, forms covalent bonds | 6.5-8.5 |
| GPAM (Glyoxalated Polyacrylamide) | Temporary wet strength, biodegradable | 4.0-6.5 |
| Starch-Based | Low cost, moderate strength gain | 5.0-7.0 |
Performance Enhancement
| Property Improved | Efficiency Gain | Typical Dosage |
|---|---|---|
| Tensile Strength | 20-40% increase | 0.1-1.0% (by weight) |
| Burst Strength | 15-35% increase | 0.2-1.2% |
| Internal Bond | 30-50% increase | 0.3-1.5% |
Application Guidelines
| Process Stage | Method | Temperature Range |
|---|---|---|
| Wet End Addition | Continuous feed to pulp slurry | 20-50°C (68-122°F) |
| Size Press | Surface application | 40-70°C (104-158°F) |
| Spray Application | Post-forming treatment | Ambient |
Advantages vs. Limitations
| Advantages | Limitations |
|---|---|
| Recyclable fiber compatibility | Potential AOX formation (chlorinated resins) |
| Works with recycled pulp | Higher cost than starch alone |
| No significant impact on brightness | May reduce drainage rate |
Comparison with Wet Strength Resins
| Parameter | Dry Strength Resins | Wet Strength Resins |
|---|---|---|
| Bond Type | Hydrogen/electrostatic | Covalent (permanent) |
| Effect Duration | Permanent | Temporary (some types) |
| Cost Efficiency | $50-300/ton | $100-500/ton |
Environmental & Safety Data
| Parameter | Compliance Status |
|---|---|
| FDA Approval | Yes (for food contact papers) |
| Biodegradability | Partial (depends on type) |
| VOC Content | Typically <1% |
Market Overview
| Segment | Market Share | Growth Rate |
|---|---|---|
| Packaging Grades | 45% | 4.2% CAGR |
| Tissue Papers | 30% | 3.8% CAGR |
| Specialty Papers | 25% | 5.1% CAGR |
Summary
Dry paper strength resins are essential additives for enhancing paper’s mechanical properties without compromising recyclability. While PAE resins dominate the market, bio-based alternatives are gaining traction due to environmental regulations. Optimal performance requires precise dosage control and pH management during application.
