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首页> 外文期刊>Journal of Applied Polymer Science >Interfacial factors affecting polymeric diphenylmethane diisocyanate/wood bond strength
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Interfacial factors affecting polymeric diphenylmethane diisocyanate/wood bond strength

机译：影响聚合二苯甲烷二异氰酸酯/木材粘合强度的界面因素

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摘要

Polymeric diphenylmethane diisocyanate (pMDI) has been used for making wood board composites for over 30 years, although its growth in application has been limited mainly by the perception that it is a high-cost alternative to formaldehyde-based adhesives. Increased use of pMDI adhesive in making wood composites will require optimization of the process variables involved. One such factor is the unresolved question of the interfacial aspects most responsible for building strong wood composites. Some argue that adhesive surface coverage is primarily responsible for board strength; others assert that penetration of the pMDI into the wood matrix is a primary characteristic of strong boards. This article wilt provide evidence that the interfacial aspect most important in building board strength is surface coverage of the wood particles or fibers. Experiments controlling the depth of pMDI penetration into wood matrices and then measuring their adherend strength were performed. We also calculated the potential efficiencies to be obtained from maximizing the surface coverage and minimizing the matrix penetration using a spherical sector model. Neither high nor low pMDI viscosity offered a significant advantage in surface covering pine or oak, although it is speculated that minimizing the droplet size of pMDI in the resination step could lead to substantial efficiency improvements in adhesive coverage. (c) 2005 Wiley Periodicals, Inc.
机译：聚合的二苯基甲烷二异氰酸酯（pMDI）已用于制造木板复合材料已有30多年的历史，尽管其应用的增长主要受到人们认为它是甲醛基胶粘剂的高成本替代品的局限。在制造木质复合材料中增加使用pMDI粘合剂将需要优化涉及的工艺变量。其中一个因素是尚未解决的问题，即界面方面最可能构成坚固的木质复合材料。有人认为，胶粘剂的表面覆盖率是造成纸板强度的主要原因。其他人则认为，pMDI渗透到木材基质中是坚固木板的主要特征。本文将提供证据表明，对建筑板强度最重要的界面是木材颗粒或纤维的表面覆盖率。进行了控制pMDI渗透到木材基质中的深度，然后测量其粘附强度的实验。我们还计算了使用球形扇形模型通过最大化表面覆盖范围和最小化基质渗透所获得的潜在效率。尽管据推测高pMDI粘度和低pMDI粘度都不能在覆盖松树或橡树的表面上提供显着的优势，但是据推测，在树脂化步骤中最小化pMDI的液滴尺寸可以显着提高粘合剂的覆盖率。 （c）2005年Wiley Periodicals，Inc.

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