文章摘要
淀粉/酚醛预聚物共缩聚胶黏剂的制备
Preparation of Starch/Phenolic Prepolymer Copolycondensation Adhesive
  
DOI:10.16865/j.cnki.1000-7555.2019.0326
中文关键词: 淀粉  氧化接枝  酚醛预聚物  共缩聚  胶黏剂  胶合性能
英文关键词: starch  oxidative grafting  phenol-formaldehyde oligomers  copolycondensation  adhesive  gluing performance
基金项目:中国博士后科学面上基金(2015M572276);湖南省自然科学青年基金(2016JJ3184);湖南省教育厅科学研究项目(17C1500);中南林业科技大学大学生科技创新基金;中南林业科技大学人才引进科研启动基金
作者单位
左迎峰,屠茹茹,李 萍,周 亚,吴义强 中南林业科技大学 材料科学与工程学院湖南 长沙 410004 
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中文摘要:
      以玉米淀粉为原料,采用次氯酸钠进行氧化改性,并以聚乙烯醇为接枝剂进行接枝改性,再与酚醛预聚物进行共缩聚反应,制得淀粉/酚醛预聚物(S/PFO)共缩聚胶黏剂。讨论了淀粉/酚醛预聚物比例、共缩聚温度和共缩聚时间对S/PFO共缩聚胶黏剂固体含量、黏度、固化时间、干状胶合强度和湿状胶合强度的影响。结果表明,淀粉/酚醛预聚物比例为15/120,共缩聚温度为90 ℃,共缩聚时间为2.0 h时,所制得的S/PFO共缩聚胶黏剂综合性能最佳。采用同步热分析和扫描电子显微镜对S/PFO共缩聚胶黏剂的固化性能和胶合界面进行了表征。相比于酚醛树脂胶黏剂,S/PFO共缩聚胶黏剂固化温度和固化焓值均降低,能够有效降低生产能耗。S/PFO共缩聚胶黏剂能将木材表面的孔隙均匀填满,形成一层薄薄的且连续的胶膜,有利于提高其胶接强度和耐水性能。
英文摘要:
      Corn starch was oxidized with sodium hypochlorite and grafted with polyvinyl alcohol. And then the copolycondensation was carried out with the phenolic prepolymer to prepared starch/ phenol-formaldehyde oligomers (S/PFO) copolycondensation adhesive. The effects of starch/ phenol-formaldehyde oligomers ratio, copolymerization temperature and copolymerization time on the solid content, viscosity, curing time, dry bonding strength and wet bonding strength of S/PFO copolymerization adhesive were discussed. The results show that the S/PFO copolycondensation adhesive has the best comprehensive properties when the starch/phenol-formaldehyde oligomers ratio is 15/120, the copolymerization temperature is 90 ℃ and the copolymerization time is 2.0 h. The curing properties and bonding interface of S/PFO copolycondensation adhesive were characterized by simultaneous thermal analysis and scanning electron microscopy. Compared with phenolic resin adhesive, the curing temperature and curing enthalpy of S/PFO copolycondensation adhesive are decreased, which could effectively reduce the production energy consumption. S/PFO copolycondensation adhesive fills the pores of wood surface evenly, forming a thin and continuous film, which is beneficial to improve the bonding strength and water resistance.
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