ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Novel CO₂-based low-molecular weight poly (propylene carbonate) diol (PPCD) for two-component polyurethane adhesive

Chaozhi Wang, Hualin Li, Zhenhong Huang, Zhu Ding, Zonglin He, Baohua Liu, Jiaoyan Ai, and Lina Song

School of Materials and Energy, Guangdong University of Technology, Guangzhou, People’s Republic of China

E-mail: 474853401@qq.com

Received: 12 October 2022  Accepted: 31 January 2023

Abstract:

The subject of this study was the application of a novel CO₂-based low-molecular weight poly (propylene carbonate) diol (PPCD) in the field of adhesive. Two-component polyurethane adhesive (PPCD-PU) was prepared with PPCD and polymethylene polyphenyl polyisocyanate (PAPI) as raw materials, propylene carbonate diol (PCD-EDA) as extender. The effects of the molecular weight, carbonate linkage content of PPCD and content of PCD-EDA on the properties of PPCD-PU were also investigated. The results showed that the novel CO₂-based low-molecular weight poly (propylene carbonate) diol had higher carbonate linkage content (35%). The PPCD-PU synthesized by the PPCD had good adhesion performance, and the lap shear strength reached to 15 MPa. The addition of PCD-EDA not only improved the bonding properties of the adhesive, but also made PPCD-PU adhesive achieved higher lap shear strength in a shorter curing time. When the amount of PCD-EDA was 20 wt.%, the lap shear strength increased to 17 MPa, and the lap shear strength increased significantly from 3.7 to 10.6 MPa after curing at 80 °C for 30 min. Water absorption rate of PPCD-PU film was about 1.7%, and the lap shear strength was almost unchanged after 24 h of immersion in water. The temperature of 5%-weight loss of PPCD-PU was 284 °C, and the glass transition temperature was 79.3 °C. All the polyurethane adhesives obtained performed good heat and water resistance.

Keywords: Poly (propylene carbonate) diol; CO2-based polyol; Low-molecular weight; Polyurethane adhesive; Carbonate linkage content

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-02708-4

Chemical Papers 77 (6) 3347–3359 (2023)