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1 Water Soluble Polymers for Paper Strength Li Zhu Department of Chemical Engineering McMaster University, Hamilton, Ontario, Canada.

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Presentation on theme: "1 Water Soluble Polymers for Paper Strength Li Zhu Department of Chemical Engineering McMaster University, Hamilton, Ontario, Canada."— Presentation transcript:

1 1 Water Soluble Polymers for Paper Strength Li Zhu Department of Chemical Engineering McMaster University, Hamilton, Ontario, Canada

2 2 Outline u Introduction u Dry strength resins u Wet strength resins

3 3 Cellulose Structure REF. Pulp and Paper. Chemistry and chemical Technology Vol. I

4 4 Hydrogen Bonds

5 5 Dry Strength Resin--- Starch u Glucose units

6 6 Cationic Starch

7 7 Cationic PAM

8 8 Conclusion---I u Dry strength resin should contain: D Cationic charges D H-bonding potential.

9 9 Homo-crosslinking

10 10 Wet--- Urea Formaldehyde Resin

11 11 Melanine Formaldehyde Resin

12 12 Co-crosslinking

13 13 Wet Strength Enhancing Ref. Charles E. Farley, wet-strength resin and application, Chapter 3

14 14 Cationic Aldehyde Starch

15 15 Conclusion---II u Wet strength resin should be able to: D Homo-crosslinking D Covalent bonding with fibers

16 16


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