Study on bonding properties and crosslinking mechanism of soybean oil-based pressure sensitive adhesive
Kuang Yongyan1 Chen Yao2 Tan Jing1 Liu Xingyu1 Bi Yanlan1 Li Jun1 Peng Dan1
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以环氧大豆油为原料，通过研究磷酸添加量、松香酯添加量、涂胶厚度、反应温度和反应时间等因素对大豆油基压敏胶粘接性能的影响，确定大豆油基压敏胶的较佳制备工艺。在此基础上，采用傅里叶变换红外光谱仪（FT-IR）和核磁共振仪（NMR）对压敏胶的结构进行解析，揭示其交联聚合机制和老化前后的结构变化。研究结果表明：大豆油基压敏胶的较佳制备工艺为，w（磷酸）=6%,w（松香酯）=70%（均相对于环氧大豆油质量而言），涂胶厚度为80μm，反应温度为50℃，反应时间为5 min。此时，胶膜呈连续状态，分子链间得到有效缠结，聚醚、聚酯反应逐步进行，极性官能团较多，与钢板的贴合力更强，交联程度较大，内聚强度增大，制备的大豆油基压敏胶无残胶，180°剥离强度为（1.866±0.18）N/cm，环形初粘力为（3.88±0.44）N。结合FTIR和1H-NMR分析压敏胶结构，表明磷酸一方面催化环氧键开环生成羟基聚醚，另一方面可以和环氧大豆油生成磷酸酯，还有部分以游离态存在。大豆油基压敏胶中松香酯以共价或物理嵌段的形式，一部分完全嵌入网络结构中，一部分以半嵌入式或游离状态在聚合物结构中。
Abstract：With epoxidized soybean oil as raw material,the optimal preparation process of soybean oil-based pressure sensitive adhesive was determined by studying the effects of phosphoric acid addition amount,rosin ester addition amount,coating thickness,reaction temperature and reaction time on bonding properties of soybean oilbased pressure sensitive adhesive. On this basis,Fourier transform infrared spectroscopy(FT-IR)and nuclear magnetic resonance spectrometry(NMR) were used to analyze the structure of pressure sensitive adhesive,revealing its crosslinking polymerization mechanism and structural changes before and after aging. The research results showed that the optimal preparation process of soybean oil-based pressure sensitive adhesive was,w(phosphoric acid)=6%,w(rosin ester)=70%(all relative to the mass of epoxidized soybean oil),the coating thickness was 80 μm,the reaction temperature was 50 ℃,and the reaction time was 5 min. At this time,the adhesive film was in a continuous state,the molecular chains were effectively entangled,the reaction of polyether and polyester proceeded gradually,the polar functional groups were relatively more,the adhesion to the steel plate was stronger,the degree of crosslinking was larger,and the cohesive strength was increased. The soybean oil-based pressure sensitive adhesive prepared had no residual,the 180° peel strength was(1.866±0.18)N/cm,and the loop tack was(3.88±0.44)N. The structure of pressure sensitive adhesive was analyzed by FT-IR and1H-NMR,which showed that phosphoric acid could catalyze the ring opening of epoxy bond to generate hydroxy polyether on the one hand,and could generate phosphate ester with epoxidized soybean oil on the other hand,and some of them existed in the free state. Rosin ester in soybean oil-based pressure sensitive adhesive was in the form of covalent or physical blocks,some fully embedded in the network structure and some in a semi-embedded or free state in the polymer structure.
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基本信息:
DOI：10.13416/j.ca.2022.11.009
中图分类号:TQ436.3
引用信息:
[1]邝永燕,陈瑶,谭婧,等.大豆油基压敏胶粘接性能和交联机制研究[J].中国胶粘剂,2022,31(11):16-25.DOI:10.13416/j.ca.2022.11.009.
Citation Information:
[1]Kuang Yongyan,Chen Yao,Tan Jing ,et al.Study on bonding properties and crosslinking mechanism of soybean oil-based pressure sensitive adhesive[J].中国胶粘剂,2022,31(11):16-25.DOI:10.13416/j.ca.2022.11.009.
基金信息:
河南工业大学高层次人才基金项目（2021BS016）
2022-11-30
2022-11-30