改性碱木质素在天然橡胶中的应用

发布时间：2018-03-19 21:42

本文选题：天然橡胶　切入点：碱木质素　出处：《青岛科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：碱木质素作为一种耐老化、价格低廉、环保等综合性能良好的新型填料被应用于橡胶中受到广泛重视,但由于其表面具有极性基团,在非极性橡胶中的分散性差,因此,开发出合理的改性方式对于提高其在非极性橡胶中的分散效果具有重要的意义。本文详细考察了两种处理方法改性的碱木质素填充天然橡胶的规律,采用动态热处理和预分散处理技术,以马来酸酐(MAH)或硅烷偶联剂(Si69)作处理剂对碱木质素进行了表面改性处理,并通过橡胶加工分析仪考察了混炼胶内填料网络结构特性对其动态力学性能的影响,并用扫描电镜观察了硫化胶的微观结构特性。结果表明:碱木质素在天然橡胶中几乎没有填料-填料相互作用,并且结合胶含量非常低,其Payne效应主要依赖于橡胶-橡胶间的相互作用。硫化胶的力学性能均随碱木质素用量的增大而降低,而耐老化性随其用量的增加而增加;碱木质素与炭黑并用时,当碱木质素用量为10phr(两者比例1:4)时,橡胶的动态力学性能、混炼特性、门尼粘度、力学性能与全炭黑填充的均相近。随填料中碱木质素比例增大,与全炭黑填充的橡胶相比各项性能下降明显。所以在炭黑填充的体系中,可以用少量碱木质素代替,既环保节约,又能在基本维持力学强度的前提下改善橡胶的耐热氧老化性能;接下来对碱木质素采用动态热处理,发现AL1-MAH胶料的力学性能明显好于AL1-Si69胶料,经动态力学性能分析,AL1-MAH胶料相对于AL1-Si69胶料来说储能模量最高,损耗模量最低,所以MAH改性效果优于Si69改性;最后采用两种处理方式,并以MAH作为改性剂,研究发现碱木质素采用动态热处理的效果不如预分散处理,预分散处理过程虽复杂,但预分散处理能让碱木质素的羟基官能团有更多的机会与MAH在分子水平进行反应。因此填充预分散处理碱木质素胶料的交联密度、结合胶、储能模量、综合力学性能高于动态热处理。并且当MAH用量为3份时混炼胶的储能模量最高,损耗模量最低。硫化胶的拉伸强度、撕裂强度、耐磨性、定伸应力最好,但是耐老性能变差。
[Abstract]:Alkali lignin as a kind of aging resistance, low price, good environmental protection performance of new packing is applied to rubber received extensive attention, but because of its surface with polar groups in nonpolar rubber in dispersion, therefore, develop a reasonable modification for improving is important in the non-polar rubber dispersion effect. This paper analyzes the two kinds of processing methods of Modified Alkali Lignin filled natural rubber by dynamic law, heat treatment and pre dispersing technology, maleic anhydride (MAH) or silane coupling agent (Si69) for the treatment of alkali lignin by agent surface modification by rubber processing analyzer was investigated in the mixed effect of rubber filler network structure characteristics on the dynamic mechanical properties, and to observe the microstructure characteristics of vulcanized rubber by SEM. The results show that the alkali lignin in natural Almost no rubber filler filler interactions, and the bound rubber content is very low, the interaction effect of Payne mainly depends on the rubber - rubber. The mechanical properties of vulcanizates with alkali lignin content decreased, and increased resistance to aging and increase its amount of alkali lignin and carbon black; and, when the alkali lignin content was 10phr (ratio 1:4), dynamic mechanical properties of rubber, mixing characteristics, Mooney viscosity, mechanical properties and full filled with carbon black were similar. With the filling of alkali lignin ratio increased, compared with the carbon black filled rubber performance decreased significantly. So in carbon black filled system, you can use a small amount of alkali lignin, both environmental conservation, and to maintain the basic premise in the mechanical strength of the improved thermal oxidative aging of rubber properties; then the alkali lignin by dynamic heat treatment, AL1-MA The mechanical properties of H compound was significantly better than that of AL1-Si69 compound, analysis of the dynamic mechanical properties of AL1-MAH compound, AL1-Si69 compound is relative to the highest storage modulus, loss modulus minimum, so the modification effect of MAH is better than Si69 modified; finally using two kinds of treatment methods, and using MAH as modifier, the study found that alkali lignin by dynamic heat treatment effect than pre dispersing, pre dispersing process is complex, but pre dispersing can make alkali lignin hydroxyl groups have more chance to react with MAH at the molecular level. Therefore, filling predispersing at the crosslink density of rubber, pigment and lignin based adhesive, energy storage modulus, comprehensive mechanical properties are better than that of dynamic heat treatment. And when MAH was 3 phr mix highest storage modulus, loss modulus of vulcanized rubber. The lowest tensile strength, tear strength, abrasion resistance, tensile stress of the good, but the old resistance of It can change.

【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ332;O636.2

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