水性聚氨酯机械发泡涂层的响应面法优化制备

doi:10.13475/j.fzxb.20171006605

Abstract

Abstract:

In order to prepare waterborne polyurethane coating with high water vapor transmission rate and tensile strength by mechanical foaming, the factors of coating-forming temperature, foaming agent concentration and foaming ratio in mechanical foaming were optimized by the response surface methodology. The results showed that the regression of the quadratic polynomial model is significant while the lack of fit is not significant, demonstrating the good fitness of the model. The order of their effects on water vapor transmission rate is coating-forming temperature, foaming ratio and foaming agent concentration in sequence, while the order of their effects on tensile strength is foaming ratio, coating-forming temperature, and foaming agent concentration in seqyebce. Based on the maximum value of water vapor transmission rate and the tensile strength the optimum conditions are coating-forming temperature of 120°C, foaming agent concentration of 5.56 % and foaming ratio of 319.17%. Under these conditions, the experimental yields of water vapor transmission rate is 6088.71 g/(m2?24h) and the tensile strength is 1.51 MPa, which are substantially consistent with the predicted values. Thus, the regression equation is valid and reliable. By taking the waterborne polyurethane coating as the foam layer of microfiber synthetic leather, the water vapor transmission rate is 2070.24 g/(m2?24h) and the perpendicular and lateral tensile forces of the obtained microfiber synthetic leather are 161.50/112.38 N.

Key words: waterborne polyurethane, foaming coating, microfiber synthetic leather, mechanical foaming, response surface methodology, water vapor transmission rate

References

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Preparation of waterborne polyurethane coating by mechanical foaming based on response surface methodology

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