Moisture-proof high-strength corrugated paper and preparation method thereof
By constructing a multi-layered hydrophobic reinforcing network with nanocellulose as the skeleton in the internal adhesive layer and surface coating of corrugated cardboard, the problem of balancing moisture resistance and high strength in corrugated cardboard is solved. This achieves high strength and moisture resistance in humid environments, making it suitable for product packaging in high-humidity environments such as cold chain logistics and fresh fruits and vegetables.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNMING RED STAR RONGHE PAPER CO LTD
- Filing Date
- 2026-05-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies struggle to simultaneously achieve moisture resistance and high strength in corrugated paper. Coatings are easily peeled off and difficult to adhere, and nanocellulose exacerbates moisture absorption and collapse in high-humidity environments.
A multi-layered hydrophobic reinforcement network is adopted. By using nanocellulose as a skeleton in the internal adhesive layer and surface coating of corrugated cardboard, and combining the synergistic effect of hydrophilic primer and hydrophobic topcoat, a moisture-proof adhesive and a coating liquid are prepared. The moisture-proof adhesive is composed of corn starch, sodium hydroxide solution, nanocellulose suspension, cationic paraffin microemulsion, aluminum sulfate, etc., and the coating liquid is composed of nanocellulose suspension, oxidized starch, polyvinyl alcohol, glycerin, etc.
It achieves a balance between moisture resistance and high ring crush strength in humid environments, maintaining good dimensional stability and mechanical support. The raw materials are mainly waste paper pulp and biodegradable natural materials, and the process is compatible with conventional corrugated cardboard production lines, requiring no high equipment investment.
Smart Images
Figure SMS_1 
Figure SMS_2 
Figure SMS_3