Prof. Xinggang Chen Profile

Prof. Xinggang Chen

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Proceedings Article | 6 February 2024 Paper

Study on phosphorus-containing polyol by degradation of waste rigid polyurethane foam

Deheng Li, Cunye Pan, Wei Deng, Xinggang Chen

Proceedings Volume 12979, 1297915 (2024) https://doi.org/10.1117/12.3015864

KEYWORDS: Polyurethane, Foam, Viscosity, Flame, Industrial chemicals, Materials properties, Ethylene glycol, Industry, FT-IR spectroscopy, Temperature metrology

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Rigid Polyurethane Foam (RPUF) has been applied as the insulation material in many fields, so the amount of polyurethane waste was accumulated gradually to pollute the environment seriously. How to degrade and apply it for high value-added is a concern for the whole of society now. In this paper, the waste RPUF was degraded by an alcoholysis reaction with Ethylene Glycol (EG) and Propylene Glycol (PG) to recover polyol. Then the polyol was reused to synthesize a phosphorus-containing polyol (P-polyol) via a transesterification reaction with diethyl ethylphosphate (DEEP). Furthermore, P-polyol was introduced into Rigid Polyurethane Foam (RPUF) by in-situ chemical reaction to obtain flame retarded RPUF to add value to the recovery technique. The reaction effect of alcoholysis and transesterification on the hydroxyl value and viscosity of polyol and P-polyol were studied. The optimal condition of alcoholysis is as follows: a mass ratio of EG, PG, and waste foam was 25:30:45 at 175 °C-200 °C. The viscosity of polyol was about 600 mPaꞏs with hydroxyl values ranging between 950 mg and 1050 mg KOH/g. The optimal transesterification condition of P-polyol is as follows: butyldihydroxychlorostannane as a catalytic agent, the mass ratio of DEEP to polyol was 1:4 at 120 °C-170 °C, the yield was over 85%, the apparent viscosity of P-polyol was 1300 mPaꞏS with the hydroxyl value about 540 mg KOH/g. It can be used in flame retarded RPUF. It provides an experimental basis for solving waste RPUF treatment and realizing a circular economy.

Proceedings Article | 25 October 2023 Paper

Effect of hollow glass microsphere on flame retardant and mechanical properties of polyurethane foams

Deheng Li, Haili Wang, Xinggang Chen, Yi Shen

Proceedings Volume 12801, 128010K (2023) https://doi.org/10.1117/12.3007184

KEYWORDS: Glasses, Microspheres, Polyurethane, Foam, Materials properties, Combustion, Flame, Composites, Polymers

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By adding a glass microsphere that was modified by different methods to a polyurethane foam system, a hollow glass microsphere/polyurethane foam composite was prepared. The effect of the modified method, the additive amount of glass microsphere on the burning and mechanical properties of rigid polyurethane foam was studied. The results show that after adding a glass microsphere, the mechanical properties of rigid polyurethane foam were reduced, and the combustion performance was improved. Comparing adding a hollow glass microsphere that modified by adding microcapsules to the coupling agent, the mechanical properties of polyurethane composite foam were declined slowly, and the inflame-retarding effect was also significantly improved. When the additive amount of hollow glass microsphere modified by microcapsules was 6%, the compressive strength and compressive modulus of polyurethane foam were decreased by 13.0% and 4.6% respectively. When the amount of hollow glass microsphere modified by microcapsules was 8%, the level combustion weightlessness speed of polyurethane declined from 0.024g/s to 0.015g/s.

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