Page 68 - 《橡塑技术与装备》2022年12期

橡塑技术与装备 CHINA RUBBER/PLASTICS TECHNOLOGY AND EQUIPMENT

而导致气体溢出，橡胶塌陷，二是因为橡胶交联产生
的箍紧力大于发泡产生的扩张力，使得发泡的气孔极
小。
#
#
从表中可以看出，A 聚合体系下 1 和 3 发泡混
#
#
炼胶的的发泡倍率大于 B 聚合体系下 2 和 4 发泡混
炼胶的的发泡倍率，同时 2# 发泡混炼胶的发泡倍率最
大为 187% 密度最小为 0.142 1 g/mL，综合认为，A
#
#
体系的发泡效果较佳。图 10 为 2 （2~1）和 3 （3~1）
的实际发泡对比图，显然 A 体系发泡效果优于 B 体系。
#
#
表 4 1 ~4 发泡胶料的发泡倍率 # #
图 10 2 和 3 发泡实际对比图
标号 发泡倍率（厚度法）/% 发泡密度 /g/mL
1 # 147.00 0.199 2
3 # 142.65% 0.433 2 （4） A 聚合体系的发泡倍率比 B 聚合体系高，A
2 # 187.83% 0.142 1
4 # 110.70% 0.471 1 体系发泡材料密度比 B 体系低。
实验过程中发现橡胶发泡性能受到多种因素影
参考文献 ：
响，探索起来具有一定难度。 [1] 如何测试未硫化橡胶硫化特性 [J]. 中国轮胎资源综合利用，
2021(03):47-48.
[2] 刘琦，李辉 . 加工工艺对混炼胶门尼黏度和门尼焦烧时间的影
3 结论
响 [J]. 橡胶科技，2020,18(11):641-643.
（1） A 聚合体系 ASTM 混炼胶的焦烧时间和正硫 [3] 白云波 . 微球发泡丁腈橡胶 - 金属复合密封板的制备技术 [D].
化时间比 B 聚合体系快，最大扭矩值比 B 聚合体系高。 桂林理工大学，2019.
（2） A 聚合体系的门尼焦烧比 B 聚合体系快。 [4] 金愿，姜莹，江鲲 . 门尼黏度计校准方法探讨 [J]. 计量技术，
2018(08):69-71+24.
（3） A 聚合体系的拉伸模量比 B 聚合体系高，B
[5] 孙露敏，李景庆 . 拉伸温度和退火对尼龙 6 力学性能的影响 [J].
聚合体系的断裂伸长率比 A 聚合体系高。 分子科学学报，2018,34(04):303-306.

Study on the synthesis of nitrile rubber by low temperature emulsion
technology and its properties (4)

Zhu Zhengjiang, Li Changhao *
(INSA GPRO (Nanjing) Synthetic Rubber Co. LTD., Nanjing 210047, Jiangsu, China)
Abstract: Four kinds of synthetic nitrile rubber were successfully prepared by low temperature emulsion
synthesis technology using chemical plant equipment, and the vulcanization properties and mechanical
tensile behavior of NBR blended rubber under ASTM standard formula were studied. In this paper, NBR/PVC
foamed blends were prepared by internal mixer and open mill, and the foaming vulcanization curves of four
synthetic rubbers were explored by using foaming vulcanizer, and their foaming ratios and densities were
compared. The results showed that the scorch time and positive vulcanization time of ASTM compound in
polymerization system A were faster than those in polymerization system B, and the maximum torque value
was higher than those in polymerization system B; The tensile modulus of polymerization system A is higher than
that of polymerization system B, and the elongation at break of polymerization system B is higher than that of
polymerization system A; The foaming ratio of polymerization system A is higher than that of polymerization
system B, and the density of foaming material of polymerization system A is lower than that of polymerization
system B.
Key words: nitrile rubber; vulcanization characteristics; stretch curve; foaming
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