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首页> 外文期刊>Journal of coatings technology and research >Use of fluoropolymer permanent release coatings for molded polyurethane foam production
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Use of fluoropolymer permanent release coatings for molded polyurethane foam production

机译：含氟聚合物永久释放涂料在模塑聚氨酯泡沫生产中的用途

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摘要

The problem of adhesion of polyurethane foams to fluoropolymer permanent release mold coatings was studied. Two coatings, based on polytetrafluoroeth-ylene (PTFE) and perfluoroalkoxy polymer (PFA) aqueous dispersions, respectively, were applied on aluminum plates, and the foam release performance evaluated. The PTFE coating displayed gradual loss of antiadhesion properties with consecutive exposure to the reactive mixture, which was associated with isocyanate surface penetration. Penetrant mass uptake experiments, performed on free films, indicated that PTFE retains about 10 times more isocyanate than PFA, probably because of its porous surface morphology. A synergistic effect was found by applying a very small quantity of a waterborne release agent on the PTFE coating, before every foam molding cycle. The release agent formed a protective barrier that minimized contact of the coating with the reactive mixture, allowing for stable and robust foam release performance. The problem of polyurea build-up, associated with the use of aqueous release agents, was not observed because of the small amounts of compound used.
机译：研究了聚氨酯泡沫与含氟聚合物永久脱模涂料的粘合问题。将分别基于聚四氟乙烯（PTFE）和全氟烷氧基聚合物（PFA）水性分散体的两种涂料涂在铝板上，并评估泡沫释放性能。 PTFE涂层在连续暴露于反应性混合物后显示出抗粘性能的逐渐下降，这与异氰酸酯的表面渗透有关。在自由膜上进行的渗透质量吸收实验表明，PTFE保留的异氰酸酯量比PFA多约10倍，这可能是由于其多孔的表面形态。在每个泡沫成型周期之前，通过在PTFE涂层上施加非常少量的水性脱模剂，发现了协同作用。脱模剂形成了一种保护性屏障，可最大程度地减少涂层与反应性混合物的接触，从而实现稳定而坚固的泡沫脱模性能。由于使用了少量的化合物，未观察到与使用水性脱模剂有关的聚脲堆积问题。

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  • 来源
    《Journal of coatings technology and research》 |2012年第6期|757-764|共8页
  • 作者

    Leandro Figueiredo; Pedro Bandcira; Adelio Mcndes; Margarida M. S. M. Bastos; Fernao D. Magalhaes;

  • 作者单位

    LEPAE-Departamento de Engenharia Quimica, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    Flupol, Rua da Central, 401, 4440-043 Campo, Portugal;

    LEPAE-Departamento de Engenharia Quimica, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    LEPAE-Departamento de Engenharia Quimica, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    LEPAE-Departamento de Engenharia Quimica, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

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  • 正文语种 eng
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  • 关键词

    fluoropolymer coating; mold release; polyurethane foam; isocyanate;

    机译：含氟聚合物涂料;脱模;聚氨酯泡沫;异氰酸酯;

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