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摘要
以再生的绿色材料麦芽糖为原料,经碱化脱水后催化与尿素反应合成了一种类似于脲醛树脂的不含甲醛的麦芽糖-尿素胶粘剂。用单因素实验对反应条件进行了探索,对催化剂的种类及用量、反应温度、反应时间和n(麦芽糖)∶n(尿素)进行了优选,得到胶粘剂合成的最佳工艺条件:催化剂选乙酸锌,用量为1g,反应温度为90℃,反应时间为8h,n(麦芽糖)∶n(尿素)为3.5,此时得到的麦芽糖-尿素胶粘剂的黏度为1.3Pa·s;加入固化剂固化后测得胶粘剂的胶合强度达到28.2MPa。红外光谱分析表明,麦芽糖可分解成5-HMF;X射线衍射仪及热重分析的结果表明,5-HMF与尿素发生缩聚反应,制备的麦芽糖-尿素胶粘剂具有较高的热稳定性。
Abstract
Maltose is a kind of biodegradable and renewable material,it was catalytic reacted with urea after alkaline dehydration,maltose-urea resin adhesive without formaldehyde was prepared successfully,which was similar to urea formaldehyde resin adhesive.The kinds of the catalysts and dosage were the first choice,reaction temperature,reaction time and the molar ratio of maltose and urea was explored by single factor experiment.The optimum values of these factors were found to be as follows:zinc acetate was used as catalyst and the weight of catalyst 1g,reaction temperature 90℃,reaction time 8h and the molar ratio of maltose and urea 3.5∶1,in this case the optimal viscosity was 1.3Pa·s.The results showed that the bonding strength was reached 28.2MPa.The results of FT-IR,XRD,and TGA shown that maltose can be degraded for HMF and condensation polymerization of 5-HMF and urea,the adhesives was stability and environmentally friendly.
关键词
糖醛尿素树脂胶
/
尿素
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木材胶粘剂
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性能
Key words
sugar aldehyde urea resin adhesive
/
urea
/
wood adhesive
/
property
麦芽糖-尿素木材胶粘剂的合成与性能[J].
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基金资助
国家自然科学基金项目(61705029);安徽省科技重大专项项目(16030801108);安徽省高校自然科学研究项目(KJ2017B05);滁州学院大学生创新创业训练项目(2018CXXL048)
