聚合反应对聚甲醛转化率及产率影响研究
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摘要
通过研究共聚甲醛生产过程中的反应温度、引发剂用量、反应物配比、反应物二氧五环添加方式及聚合方式、捏合机螺杆转速对共聚甲醛转化率及产率的影响,确定最佳聚合反应条件以提升共聚甲醛的产率.研究结果表明:当反应温度为88℃,引发剂三氟化硼用量为50 ppm,二氧五环占整个物料比例为3.5%,采用三氟化硼与二氧五环先期引发聚合时产物转化率达到77.85%;当螺杆转速为35 r/min时,产率达75.53%,此时,聚甲醛生产工艺参数达到最优,聚合反应稳定,能够满足聚甲醛生产装置长周期运行要求.
The influence of reaction temperature,the amount of initiator BF3,reactant ratio,DOX addition and polymerization method,and kneading machine screw speed for the conversion rate and yield of POM was studied to decide the best polymerization reaction condition to improve the yield of POM. The results show that with the reaction temperature of 88 ℃,initiator BF3 consumption of 50 ppm,DOX accounted for the entire material ratio of 3.5%,and DOX early polymerization conditions,the conversion rate reached 77.85%,and then with the screw speed of 35 r/min,the yield reached75.53%,as POM production process parameters to achieve optimal polymerization stability.
The influence of reaction temperature,the amount of initiator BF3,reactant ratio,DOX addition and polymerization method,and kneading machine screw speed for the conversion rate and yield of POM was studied to decide the best polymerization reaction condition to improve the yield of POM. The results show that with the reaction temperature of 88 ℃,initiator BF3 consumption of 50 ppm,DOX accounted for the entire material ratio of 3.5%,and DOX early polymerization conditions,the conversion rate reached 77.85%,and then with the screw speed of 35 r/min,the yield reached75.53%,as POM production process parameters to achieve optimal polymerization stability.
引文
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[2]申宏鹏,孟永智,方伟,等.煤基共聚甲醛增韧改性研究[J].工程塑料应用,2013,41(11):35-38.SHEN H P,MENG Y Z,FANG W,et al. Study on toughening modification of coal-based Co-POM[J].Engineering Plastics Application,2013,41(11):35-38.
[3]UTHAMAN R N,PANDURANGAN A,MAJEED S S M A.Blends of polyacetal and ethylene-octene elastomer:Mechanical, dynamic mechanical and morphological properties[J]. Journal of Polymer Research,2007,14(6):441-447.
[4] IGNATOVA M. Synthesis of copolymer brushes endowed with adhesion to stainless steel surfaces and antibacterial properties by controlled nitroxide-mediated radical polymerization[J]. Langmuir,2004,20(24):10718-10726.
[5]张建强,唐斌,夏成良,等.甲缩醛与三聚甲醛合成聚甲氧基二甲醚反应速率研究[J].化学反应工程与工艺,2015,31(1):65-75.ZHANG J Q,TANG B, XIA C L, et al. Kinetics of polyoxymethylene dimethyl ethers synthesis from methylal and trioxymethylene[J]. Chemical Reaction Engineering and Technology,2015,31(1):65-75.
[6] CELIK F E,KIM T J,BELL A T. Effect of zeolite framework type and Si/Al ratio on dimethoxymethane carbonylation[J]. Journal of Catalysis,2010,270(1):185-195.
[7] BURGER J,SIEGERT M,STROFER E,et al. Poly(oxymethylene)dimethyl ethers as components of tailored diesel fuel:Properties,synthesis and purification concepts[J]. Fuel,2010,89(11):3315-3319.
[8]李丽英,方伟,孟永智,等.聚甲醛/丙烯酸弹性体共混物的性能研究[J].塑料工业,2014,42(12):21-24.LI L Y,FANG W,MENG Y Z,et al. Study on properties of POM/acrylate elastomer blend[J]. China Plastics Industry,2014,42(12):21-24.
[9]王亮亮,陈科宇,商亚东,等.成核剂对聚甲醛结构与性能的影响[J].工程塑料应用,2013,41(6):84-87.WANG L L,CHEN K Y,SHANG Y D,et al. Effects of nucleator on structure and property of POM[J].Engineering Plastics Application,2013,41(6):84-87.
[10]吴保章,王彦辉,李豪,等.膨胀蛭石填充聚甲醛复合材料的制备与性能[J].化学研究,2017,28(2):236-240.WU B Z,WANG Y H,LI H,et al. Preparation and properties of polyoxymethylene composites filled with expanded vermiculite[J]. Chemical Research,2017,28(2):236-240.
[11]卢波,邹光继,季君晖,等.聚甲醛/水镁石纤维复合材料的制备与表征[J].合成树脂及塑料,2015,32(5):32-35.LU B, ZOU G J, JI J H, et al. Preparation and characterization of fibrous brucite/polyoxymethylene composites[J]. China Synthetic Resin and Plastics,2015,32(5):32-35.
[12] ECHHARD S, HANS H, SERGEJ B. Method for producing polyoxymethylene dimethyl ethers from methanol and formaldehyde:US,7671240[P]. 2010-03-02.
[13] BURGER J, STROFER E, HASSE H. Chemical equilibrium and reaction kinetics of the heterogeneously catalyzed formation of poly(oxymethylene)dimethyl ethers from methylal and trioxane[J]. Industrial&Engineering Chemistry Research,2012,51(39):12751-12761.