宋少波 杜瑞环 周洪芝 薛雪雪


摘 要:环氧胶粘剂是建筑加固中不可或缺的一类材料。对于压注型胶粘剂,黏度是一个极其重要的工艺指标。同时热变形温度又是一个必不可少的材料性能指标,通过调整稀释剂的用量改变胶粘剂黏度以及热变形温度的变化。本文主要研究了稀释剂种类与同类稀释剂用量对于胶粘剂黏度与热变形温度的影响,得出稀释剂添加量不宜超过A组分用量的15%,且单官能度的稀释剂对于黏度与热变形温度影响更为明显。经分析数据得出,同固化体系下,黏度与热变形温度存在正相关关系,为合理的设计胶粘剂提供思路。
关键词:压注型胶粘剂;稀释剂;粘度;热变形温度
中图分类号:TQ433.4+37 文献标识码:A 文章编号:1001-5922(2021)05-0005-04
Effect of Diluent on Heat Resistance of Epoxy Adhesives
Song Shaobo,Du Ruihuan, Zhou Hongzhi, Xue Xuexue
(Carbon Technology Group Co., Ltd., Tianjin, 300383, China)
Abstract:Epoxy adhesives is indispensable material in building reinforcement. Viscosity is a very important process index for press-injection adhesives. At the same time, thermal deformation temperature is an essential material performance index. The viscosity and thermal deformation temperature of the adhesives can be changed by adjusting the amount of diluent. This paper mainly studied the influence of the type of diluent and the dosage of similar diluent on the viscosity and hot deformation temperature of adhesives. It was concluded that the dosage of diluent should not exceed 15% of the dosage of component A, and the single functional diluent had more obvious influence on the viscosity and thermal deformation temperature. After analyzing the data, it is concluded that there is a positive correlation between the viscosity and the thermal deformation temperature in the same curing system, which provides an idea for the rational design of adhesives.
Key words:press-injection adhesives; diluent; viscosity; thermal deformation temperature
0 引言
混凝土結构加固改造工程中,环氧树脂建筑结构胶因具有优异的力学性能和耐久性能得到广泛使用[1,2]。压注型胶粘剂是用于建筑材料加固的一类环氧胶粘剂,常见于裂缝修补与外包型钢加固工程。
对于压注型胶粘剂而言,初始粘度是其重要的一项工艺性能指标,决定其是否可进行正常的压注。同时,作为高分子材料,材料的性能受温度影响显著。因此科学家对高分子材料的耐热性也有深入的研究。热变形温度是国内外相关技术规范用来评价结构胶耐热性能的重要指标[3-4]。GB 50728-2011《工程结构加固材料安全性鉴定技术规范》中对结构胶的耐热性能做了规定:以混凝土为基材的I类胶在23℃固化、养护21d,到期使用0.45MPa弯曲应力的B法测定指标≥65℃。……