水性异氰酸酯木材胶黏剂耐久性研究

doi:10.3969/j.issn.0253-2417.2015.02.004

林产化学与工业 ›› 2015, Vol. 35 ›› Issue (2): 25-30.doi: 10.3969/j.issn.0253-2417.2015.02.004

水性异氰酸酯木材胶黏剂耐久性研究

王淑敏¹, 时君友^1,2

1. 东北林业大学材料科学与工程学院, 黑龙江哈尔滨 150040;
2. 北华大学木质材料科学与工程重点实验室, 吉林吉林 132013

收稿日期:2014-10-31 出版日期:2015-04-25 发布日期:2015-04-24
通讯作者: 时君友,教授,博士生导师,研究领域:木材胶黏剂和生物质材料;E-mail:bhsjy64@163.com。 E-mail:bhsjy64@163.com
作者简介:王淑敏(1979-),女,吉林德惠人,博士生,主要从事生物质材料研究
基金资助:
国家自然科学基金资助项目(31070508);吉林省木质材料科学与工程重点实验室开放基金资助(无编号)

Durability of Aqueous Polymer Isocyanate Wood Adhesive

WANG Shu-min¹, SHI Jun-you^1,2

1. College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China;
2. Wood Material Science and Engineering Key Laboratory, Beihua University, Jilin 132013, China

Received:2014-10-31 Online:2015-04-25 Published:2015-04-24

摘要/Abstract

摘要： 通过红外、热重和压剪强度分析,对水性异氰酸酯(API)木材胶黏剂在加速老化处理1~7个周期(A1~A7)和湿热老化处理1~7个周期(H1~H7)的耐久性进行了研究。红外分析表明:未处理的API胶膜(S)含有大量的异氰酸酯基团,A1~A7的API胶膜中异氰酸酯基团全部消失,H1~H3的API胶膜中仍有异氰酸酯吸收峰存在,但强度减弱, H4~H7的异氰酸酯基团消失。热重分析结果表明:A1~A4胶膜的初期热稳定性优于H1~H4, 5~7个周期热稳定性几乎相同。在相同质量损失下,加速老化处理API胶膜更稳定, A1~A7降解活化能不完全相同,即降解速度不同;而H1~H7胶膜的活化能几乎相同。2种处理方法胶合制品的压剪强度随时间延长逐渐降低,加速老化处理到第3个周期压剪强度仅为5.32MPa,湿热老化处理到第5个周期压剪强度降为6.92 MPa,均达不到国家标准。

关键词: 水性异氰酸酯木材胶黏剂, 耐久性, 加速老化, 湿热老化

Abstract: The durability of aqueous polymer isocyanate (API) wood adhesive was studied under accelerated aging process for 1-7 cycles (A1-A7) and hydrothermal aging for 1-7 cycles (H1-H7) by using Fourier transform infrared spectroscopy(FT-IR), thermogravimetric analysis(TGA), and compressive shear strength analysis. FT-IR analysis showed that the untreated API film(S) contained a considerable amount of isocyanate group, whereas the isocyanate groups of API films for A1-A7 disappeared. Absorption peaks of isocyanate group of API films for H1-H3 still existed, but the intensity weakened. The isocyanate groups of API films for H4-H7 also disappeared. TGA analysis showed that thermal stabilities of A1-A4 in the initial stage were superior to those of H1-H4, but they were almost the same in the 5-7 cycles. Under the same weight loss, the API films with accelerated aging process were more stable, and the degradation activation energies of A1-A7 were not exactly the same, namely, the degradation rates were different. However, the activation energies of H1-H7 were almost the same. The compressive shear strengths of glued products treated in the two methods were gradually decreased. The compressive shear strengths of the API films with accelerated aging process for the third cycle was 5.32 MPa and that of sample with hydrothermal aging for the fifth cycle was 6.92MPa. They did not meet the national standards.

Key words: aqueous polymer isocyanate wood adhesive, durability, accelerated aging, hydrothermal aging

中图分类号:

TQ35

王淑敏, 时君友. 水性异氰酸酯木材胶黏剂耐久性研究[J]. 林产化学与工业, 2015, 35(2): 25-30.

WANG Shu-min, SHI Jun-you. Durability of Aqueous Polymer Isocyanate Wood Adhesive[J]. Chemistry and Industry of Forest Products, 2015, 35(2): 25-30.

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水性异氰酸酯木材胶黏剂耐久性研究

Durability of Aqueous Polymer Isocyanate Wood Adhesive

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