Effect of Isocyanate Resin Content on Properties of High-Density Fiberboards

Qi-heng TANG; Miao ZOU; Sheng-dong XU; You-bin ZHU; Lei ZHANG; Wen-jing GUO; Liang CHANG

doi:10.12326/j.2096-9694.2021177

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Effect of Isocyanate Resin Content on Properties of High-Density Fiberboards
1.Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China
2.Xiayi Huasheng Wood Industry Co,Ltd.,Shangqiu 476400,Henan,China
Vol. 36, Issue 3, Pages: 40-45(2022)
DOI： 10.12326/j.2096-9694.2021177

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唐启恒,邹淼,徐盛栋等.施胶量对异氰酸酯胶高密度纤维板性能的影响[J].木材科学与技术,2022,36(03):40-45.

TANG Qi-heng,ZOU Miao,XU Sheng-dong,et al.Effect of Isocyanate Resin Content on Properties of High-Density Fiberboards[J].Chinese Journal of Wood Science and Technology,2022,36(03):40-45.
唐启恒,邹淼,徐盛栋等.施胶量对异氰酸酯胶高密度纤维板性能的影响[J].木材科学与技术,2022,36(03):40-45. DOI： 10.12326/j.2096-9694.2021177.

TANG Qi-heng,ZOU Miao,XU Sheng-dong,et al.Effect of Isocyanate Resin Content on Properties of High-Density Fiberboards[J].Chinese Journal of Wood Science and Technology,2022,36(03):40-45. DOI： 10.12326/j.2096-9694.2021177.

摘要

以杨木纤维和异氰酸酯胶为原料制备高密度纤维板，探索施胶量对高密度纤维板性能的影响。结果表明：随着施胶量从3%增加到10%时，高密度纤维板的耐水性能、力学性能逐步增强，在施胶量为10%时，纤维之间的结合更加紧密，板材的胶合强度最高，性能达到最佳；随着施胶量的进一步增大，异氰酸酯基团和纤维中的水分发生反应释放CO,2,，易引起板材鼓泡，从而降低了高密度纤维板的物理力学性能。MDI施胶量为3%时，制备得到的异氰酸酯胶高密度纤维板，其物理力学性能满足GB/T 31765—2015《高密度纤维板》中对普通型高密度纤维板的性能要求；MDI施胶量为6%时，制备得到的异氰酸酯胶高密度纤维板，其物理力学性能均优于GB/T 31765—2015对高湿型高密度纤维板的性能要求。因此，建议根据异氰酸酯胶高密度纤维板的用途，选择适合的施胶量。

Abstract

In this study, high-density fiberboards were made of poplar fiber and isocyanate resin. The effect of resin content on the properties of fiberboards was explored. The results showed that the mechanical properties and water resistance of fiberboards gradually increase with increasing of the resin content from 3% to 10%. When the resin content ration reached 10%, the performance of fiberboard exhibited the optimum performances. Moreover, with the further increase of the resin content, the mechanical properties and water resistance of the fiberboards decreased gradually. Because the isocyanate group can react with the water in the fiberboard, then release CO,2, during high-temperature curing, it was easy to produce lots of bubbles in the fiberboards, thus reducing the strength of physical and mechanical properties. When the resin content of MDI was 3%, the physical and mechanical properties of the high-density fiberboard met the requirements for general purpose high-density fiberboard in GB/T 31765—2015 ",High Density Fiberboard ,"; the resin content of MDI was 6%, the physical and mechanical properties of high-density fiberboard were better than the performance requirements for high-humid high-density fiberboard in GB/T 31765—2015. It was recommended to select a suitable content of resin according to the application of the isocyanate glue high-density fiberboard.

关键词

高密度纤维板异氰酸酯施胶量力学性能耐水性能

Keywords

high-density fiberboardisocyanate resinresin contentmechanical propertieswater resistance

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