草酸对胶清橡胶外观及物机性能的影响
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摘要
采用化学浸泡的方法,研究草酸及其不同用量对胶清橡胶6项指标、颜色、分子量及力学性能的影响。结果表明,与对照样相比,经过草酸处理的胶清橡胶,随着草酸用量的增加,其杂质含量变化不大,挥发物逐渐减小,灰分含量增大,塑性初值(P_0)及塑性保持率(PRI)提高;经过草酸处理后的胶清橡胶的颜色得到了明显改善;胶清橡胶的数均分子量(M_n)与重均分子量(M_w)逐渐减小,多分散系数(M_w/M_n)值增大;经过草酸处理的胶清橡胶的力学性能都有所提高,当草酸用量为2%时,其拉伸强度达到最高值27.08 MPa,且经过草酸处理的胶清橡胶耐老化性能均得到提高。
The effects of oxalic acid and different amounts of oxalic acid on the six indices, color, molecular weight and mechanical properties of skim rubber were studied by chemical immersion method. The results showed that as the amount of oxalic acid usage increased, in the content of the impurities changed little, volatile matter gradually decreased, ash content, plastic initial value( P_0) and plastic retention rate( PRI) increased. After oxalic acid treatment, the color of skim rubber was improved obviously. The average molecular weight( M_n) and the weight average molecular weight( M_w) of rubber decreased gradually. And the value of multiple dispersion coefficient(M_w/M_n) increased. The mechanical properties of skim rubber treated by oxalic acid increased. When the dosage of oxalic acid was 2%, the tensile strength reached the highest 27.08 MPa. The aging resistance of the skim rubber treated by oxalic acid was improved.
The effects of oxalic acid and different amounts of oxalic acid on the six indices, color, molecular weight and mechanical properties of skim rubber were studied by chemical immersion method. The results showed that as the amount of oxalic acid usage increased, in the content of the impurities changed little, volatile matter gradually decreased, ash content, plastic initial value( P_0) and plastic retention rate( PRI) increased. After oxalic acid treatment, the color of skim rubber was improved obviously. The average molecular weight( M_n) and the weight average molecular weight( M_w) of rubber decreased gradually. And the value of multiple dispersion coefficient(M_w/M_n) increased. The mechanical properties of skim rubber treated by oxalic acid increased. When the dosage of oxalic acid was 2%, the tensile strength reached the highest 27.08 MPa. The aging resistance of the skim rubber treated by oxalic acid was improved.
引文
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[11]任夏,邱军,段苏珍,等.色差仪在烤烟烟叶颜色检测中的应用[J].江苏农业科学,2014,42(7):335-337.
[12]Boonyang H,Sakdapipanich J.The Method to Produce LightColor Natural Rubber[J].Advanced Materials Research,2013,844:85-88.
[13]耿志远,王冬梅,薄丽丽,等.草酸分子结构与性质的量子化学计算研究[J].西北师范大学学报(自然科学版),2005,41(3):58-62.
[14]陈慧君.天然橡胶中挥发份的因素分析[J].特种橡胶制品,1997,18(5):51-53.
[15]徐天才,池商林,何映平.高级胶清橡胶的制备及性能研究[J].橡胶工业,2008,55(6):343-346.
[2]GB/T 8081-2008,天然生胶技术分级橡胶(TSR)规格导则[S].
[3]杨映华,华建坤,刀建华,等.基于均匀颜色空间的天然橡胶颜色测量[J].橡胶工业,2012,59(2):115-117.
[4]吕新广,赵美京.CIELAB色度空间的均匀性研究[J].郑州大学学报(理学版),2002,34(1):69-73.
[5]赖凌凌,郭雅玲.L*a*b*表色系统与绿茶搪塞的相关性分析[J].热带作物学报,2011,32(6):1 172-1 175.
[6]林蔚,李晓生,等.钒锆黄色料制备及色度分析[J].齐齐哈尔大学学报,2015,31(2):12-17.
[7]苏华蒂一苏色诺,尤承霖.提高胶清橡胶质量的研究[J].热带作物译丛,1976,42(2):17-19,21.
[8]陈海芳,张华平,陈旭国.天然橡胶分子量、分子量分布及其性能的研究[J].广西热带农业,2008,1(3):9-12.
[9]君轩.橡胶的分子量和分子量分布[J].世界橡胶工业,2010,37(11):47-48.
[10]王健犀.色差测量的几何条件与设备[J].涂料工业,2006,36(7):59-60,63.
[11]任夏,邱军,段苏珍,等.色差仪在烤烟烟叶颜色检测中的应用[J].江苏农业科学,2014,42(7):335-337.
[12]Boonyang H,Sakdapipanich J.The Method to Produce LightColor Natural Rubber[J].Advanced Materials Research,2013,844:85-88.
[13]耿志远,王冬梅,薄丽丽,等.草酸分子结构与性质的量子化学计算研究[J].西北师范大学学报(自然科学版),2005,41(3):58-62.
[14]陈慧君.天然橡胶中挥发份的因素分析[J].特种橡胶制品,1997,18(5):51-53.
[15]徐天才,池商林,何映平.高级胶清橡胶的制备及性能研究[J].橡胶工业,2008,55(6):343-346.