じPP中石化茂名PPR-M55-S┷

品牌：进口 产品规格：齐全 产地：广东东莞市 包装说明： CAS/标准: 运输说明：






(4) chemical stability: PP has good chemical stability, can be concentrated sulfuric acid and concentrated nitric acid erosion, are relatively stable to various other chemical reagents, but low molecular weight aliphatic hydrocarbon and aromatic hydrocarbon can make PP softening and swelling, chemical stability with the increase of the crystallinity is improved. Therefore, PP is suitable for the production of pipeline and accessories in Russian chemical industry, and has good corrosion prevention effect.じ PP中石化茂名PPR-M55-S┷
(5) the electrical properties of polypropylene high insulating performance, because it does not absorb water, so the effect of insulation performance is not affected by humidity, have higher dielectric constant, and the temperature rise, heat can be used for the production of electrical insulation products, breakdown voltage is also very high, suitable for electrical accessories etc.. It has good resistance to voltage and arc resistance, but it has high static electricity, and it is easy to be aged with copper. 表2 2月份北美钢材价格表单位：美元
(6) weatherability: polypropylene is very sensitive to ultraviolet radiation. Adding Zinc Oxide thiopropionic acid, cinnamon fat and carbon black similar cream in February can improve its aging resistance.
Molding process
The selection of injection molding machine: there is no special requirement for the selection of injection molding machine. Because of the high crystallinity of PP, it is necessary to use a computer injection machine with high injection pressure and multi - section control. The clamping force according to the general 3800t/ meters to determine the injection amount is 20%-85%.
The heat sealing temperature is determined according to the use: ordinary grade, that is, non cooking grade, using homopolymer PP, high melting point, so the heat sealing temperature is 140-170. The heat sealing temperature of the copolymer PP is 125-150 C.
2. biaxially stretched PP filmじ PP中石化茂名PPR-M55-S┷
The biaxially stretched PP film is BOPP or OPP, and its production route is roughly three:
(1) flat film and biaxial stretching method: PP pellets are plasticized by extruder. They are extruded from the T machine, and the thickness is about 0.8-1 mm. The vertical and horizontal stretching is carried out on the drawing machine at the same time. It is very difficult to use this method.
(2) flat film progressive biaxial stretching method: after extruding thick sheet, it is stretched longitudinally through the roller first, then stretched by a stretper, stretching 40-50 times, and the thickness of the film is about 15, 50 microns. This method is more commonly used.
(3) bubble tube method at the same time biaxial stretching method: first, make thick tube, thickness 0.7-0.8 mm, and then use compressed air to expand, that is, transverse stretching at the same time, using draft roller for longitudinal stretching.