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<p>A series of environmentally friendly and odorless CO<sub>2</sub>-based waterborne polyurethanes (PPCD-WPUs) were synthesized by changing the traditional acetone process without adding organic solvents (acetone) and volatile ammonia (triethylamine) in the whole preparation process. Firstly, through formula design, we changed the size of the <i>R</i> value and used inorganic base (NaOH) as a neutralizing agent, and then increased the temperature of H<sub>2</sub>O to avoid the high viscosity problem caused by traditional emulsification processes. When the <i>R</i> value of the prepolymer is 1.88 and the temperature of H<sub>2</sub>O is 40°C, environmentally friendly solvent-free waterborne polyurethane can be prepared. The particle sizes of the PPCD-WPUs prepared by this method are between 45 and 70&#xa0;nm, the appearance is transparent and the emulsion shows good stability. By using EDA to extend the chain, the mechanical strength of PPCD-WPU can be effectively improved. When the <i>R</i> value is 1.88, the tensile strength of the film is 30.8&#xa0;mPa and the elongation at break is 547.8%. However, when H<sub>2</sub>O is used as chain extender, a large number of terminal amino groups appear, the absorption peak of chromogenic groups is obvious, and the performance decreases. With the increase in <i>R</i> value, the water absorption decreases from 13.5 to 7.9&#xa0;wt%, and the thermal decomposition temperature decreases slightly (5&#xa0;wt% loss temperature from 253.6 to 228.5°C). Moreover, the prepared PPCD-WPU has high UV transmittance. This study has a positive guiding significance for the green industrial production and application of CO<sub>2</sub> copolymer-based polyurethane in the future.</p>

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The effect of NCO/OH ratio on the synthesis and behavior of solvent-free CO2-based waterborne polyurethane

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Wenqi Xian,
  • Maoyi He,
  • Rui Zheng,
  • Zhu Liu,
  • Ming Lu,
  • Yuehuan Chu,
  • Hao Cao,
  • Zhouguang Lu

摘要

A series of environmentally friendly and odorless CO2-based waterborne polyurethanes (PPCD-WPUs) were synthesized by changing the traditional acetone process without adding organic solvents (acetone) and volatile ammonia (triethylamine) in the whole preparation process. Firstly, through formula design, we changed the size of the R value and used inorganic base (NaOH) as a neutralizing agent, and then increased the temperature of H2O to avoid the high viscosity problem caused by traditional emulsification processes. When the R value of the prepolymer is 1.88 and the temperature of H2O is 40°C, environmentally friendly solvent-free waterborne polyurethane can be prepared. The particle sizes of the PPCD-WPUs prepared by this method are between 45 and 70 nm, the appearance is transparent and the emulsion shows good stability. By using EDA to extend the chain, the mechanical strength of PPCD-WPU can be effectively improved. When the R value is 1.88, the tensile strength of the film is 30.8 mPa and the elongation at break is 547.8%. However, when H2O is used as chain extender, a large number of terminal amino groups appear, the absorption peak of chromogenic groups is obvious, and the performance decreases. With the increase in R value, the water absorption decreases from 13.5 to 7.9 wt%, and the thermal decomposition temperature decreases slightly (5 wt% loss temperature from 253.6 to 228.5°C). Moreover, the prepared PPCD-WPU has high UV transmittance. This study has a positive guiding significance for the green industrial production and application of CO2 copolymer-based polyurethane in the future.