Water Soluble Polymers for Paper Strength

1
Water Soluble Polymers for Paper Strength

• Li Zhu
• Department of Chemical Engineering
• McMaster University, Hamilton, Ontario, Canada

2
Outline

• Introduction
• Dry strength resins
• Wet strength resins

3
Cellulose Structure
REF. Pulp and Paper. Chemistry and chemical
Technology Vol. I
4
Hydrogen Bonds
5
Dry Strength Resin--- Starch

• Glucose units

6
Cationic Starch
7
Cationic PAM
8
Conclusion---I

• Dry strength resin should contain
• Cationic charges
• H-bonding potential.

9
Homo-crosslinking
10
Wet--- Urea Formaldehyde Resin
11
Melanine Formaldehyde Resin
12
Co-crosslinking
13
Wet Strength Enhancing

Ref. Charles E. Farley, wet-strength resin and
application, Chapter 3
14
Cationic Aldehyde Starch
15
Conclusion---II

• Wet strength resin should be able to
• Homo-crosslinking
• Covalent bonding with fibers

16
Http//www.papersci.mcmaster.ca
?
Thanks