The intermittent small-size polypropylene production device has the characteristics of simple process flow, low investment, short construction period, low production cost, good economic efficiency, and less waste.
In recent years, China's small-bulk polypropylene production industry has developed rapidly. In the domestic plastic packaging industry, the usage has been continuously expanding. However, the intermittent production process causes many defects in the small-bulk polypropylene products. Due to the different amount and quality of raw material propylene, catalyst, triethylaluminum (AIEt) activator (co-catalyst), and hydrogen used in each batch, these are different. There are also differences in the method, time, and reaction parameters of raw material mixing, and the difference in the equipment itself, resulting in unequal production and quality of each polypropylene product.
Among them, the phenomena of partial melting and discoloration and agglomeration occurring during the storage and transportation of the small-bulk polypropylene powder, the burning phenomenon, is a serious quality problem. The small bulk polypropylene powder produced after the burning phenomenon was yellow in color, crisp in texture, and agglomerated. During the firing process, the small bulk polypropylene powder has a high internal temperature and emits a strong irritating odor. The burning phenomenon mostly occurs in the packaged products, but the small bulk polypropylene powder discharged on the spot occasionally burns. When the summer temperature is high, the small bulk polypropylene powder stored outdoors will burn. More. The burning phenomenon not only caused some products to be unusable, but also caused a large change in the melt flow rate of the batch.
Through the analysis of the batch-type small-bulk polypropylene powder burning phenomenon, the cause of the burning phenomenon of batch-type small-bulk polypropylene powder was found out.
By enhancing technological transformation and production monitoring, improve the quality and stability of the raw material propylene; add the appropriate amount of triethyl aluminum (AlEt3) activator, that is, select the appropriate molar ratio of activator (Al) to polypropylene catalyst (Ti), In order to reduce the residual amount of AlEt3 activator in the product and reduce the discharge temperature (discharge temperature should not exceed 45 °C) and other measures to basically solve the intermittent small-bulk polypropylene burning problem.
Artistar , https://www.cn-artistar.com