共查询到18条相似文献,搜索用时 62 毫秒
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酚醛树脂改性煤焦油沥青中制得的中间相球体的结构特征 总被引:3,自引:0,他引:3
Mesocarbon microbeads (MCMB) were prepared from coal tar pitch modified by phenolic resin and from the same pitch modified by phenolic resin and hexamethylenetetramine at 440℃ for lh. By investigating the morphology of mesophase spheres and the structure of the MCMB carbonized at 1000℃ for lh using scanning electron microscope (SEM) and XRD, it was found that phenolic resin accelerated the formation and coalescence of mesophase spheres. Some of the obtained MCMB were hi- or tri-spheres with the distorted microtextural carbon layers. Hexamethylenetetramine in the pitch modified by phenolic resin accelerated the condensation of phenolic resin and consequently expedited the combination of mesophase spheres, which was proved by the formation of some tetra-spheres. Owing to the cross-linkage of the additives, MCMB with complex structure were obtained. 相似文献
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高碳酚醛树脂的结构改性 总被引:10,自引:0,他引:10
本文通过在酚醛树脂中引入多环酚,提高了酚醛树脂的残碳率,并分析了环残碳率的影响,同时通过实验证明主链结构中的醚键和小侧基将明显降低的残碳率。 相似文献
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以木焦油作为BOPF(生物油-酚醛树脂)的改性剂,制备BTPF(木焦油改性生物油-酚醛树脂)胶粘剂,并用于胶合板的制备。以木焦油加入量、催化剂(NaOH)含量和反应时间作为试验因素,以胶接强度、黏度和凝胶时间作为评价指标,采用正交试验法优选出制备BTPF胶粘剂的最佳工艺条件。结果表明:当w(木焦油)=15%、w(NaOH)=4%和反应时间为40 min时,BTPF胶粘剂的综合性能相对最好,并且完全满足GB/T 14732-2006标准中的指标要求,相应胶合板的胶接强度(1.54 MPa)和甲醛释放量(0.25 mg/L)达到了GB/T 18580—2001标准中的Eo级指标要求。 相似文献
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淀粉改性酚醛胶粘剂的研究 总被引:7,自引:0,他引:7
介绍了以淀粉部分代替甲醛与苯酚反应制备淀粉改性酚表粘剂的工艺,并对该胶粘剂的性能进行了测试,讲座了各种因素驿改笥胶粘剂性能的影响,用淀粉改性酚醛胶粘剂代替酚醛胶粘剂,可以降低成本和毒性,改善生产和施工环境养活环境污染。 相似文献
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