利用控制图监控聚丁二烯橡胶生胶性能的检验质量

The Use of Control Charts to Monitor of Quality Inspection for Raw Rubber Performance of Butadiene Rubber

对国内某合成橡胶厂生产的聚丁二烯橡胶(BR)9000产品进行生胶性能检验,分别绘制挥发分、灰分、生胶门尼粘度等技术指标的X-R(或S)控制图,根据控制图可以看出聚丁二烯橡胶的挥发分、灰分、生胶门尼粘度的检验结果处于良好的受控状态,实验室有较高的系统控制能力和随机控制能力,检验结果准确可靠。应用X-R(或S)控制图,测定聚丁二烯橡胶挥发分时,系统误差控制在±0.11%范围,随机误差应小于0.28%,标准偏差应小于0.15%;测定聚丁二烯橡胶灰分时,系统误差控制在±0.02%范围,随机误差应小于0.05%,标准偏差应小于0.03%;测定聚丁二烯橡胶门尼粘度时,系统误差控制在±2范围,随机误差应小于5.1,标准偏差应小于2.6。

The raw rubber performance of butadiene rubber （BR） 9000 producted by a domestic synthetic rub- ber factory was tested and the X-R （ or S） control charts of volatile matter content, ash content and raw rubber Moo- ney viscosity were drawn, respectively. According to the control charts, the test results of the volatile matter content, ash content and raw rubber Mooney viscosity of butadiene rubber were in a good control condition and the results were accurate and reliable, which means the laboratory had higher system control ability and stochastic control abili- ty. Using the X-R （or S） control charts, the system error was controlled in the range of ＋ 0. 11%, the random error should be less than 0. 28% and the standard deviation should be less than 0. 15% when the volatile matter content was determined;the system error was controlled in the range of ± 0. 02%, the random error should be less than 0. 05 % and the standard deviation should be less than 0. 03 % when the ash content was determined ; the system er- ror was controlled in the range of ± 2, the random error should be less than 5.1 and the standard deviation should be less than 2.6 when the Mooney viscosity was determined.