pp丨 j945丨曉星<物性表>pc/abs fr2000、pp 2311lcx ta6,、pp 10641 ,、tpe 7070n/1002、ppo se100x、pa6 c50h2、pc dx06313、tpu t4086,、pc dx11355、
pp pp-331tw,、tpu s95anpc/abs pl2010a,、asa u307,、pa6 k224-hg6u、ppo ah40-9001,、pc/abs cy4000,、pp h110ma、pa66 s3cw,、pom ew-02,、pc ac3830-ad
car: door handle, bumper, split cover, fender, wire shield, wheel cover
pp丨 j945丨曉星<物性表>pps g131j1、pc g-3130m,、tpu k-787a,、pp 30yk270、lcp e480i,、pp rd461cf,、pbt 1403g6、pp t1701,、pc gsv2010r2,、
pp 1102l、ppo se1x-111pp jm-365,、tpu t370a,、pa66 fg133f1、tpu 58252,、pp cx02-82 ,、pa46 ts200f10、pp 8682,、pc 1414 wh9a320l,、
pa12 lv-50hfwabkpc gsv-2030ft 、pps 4184l4,、tpe g2745
pbt but also produce hdpe by adding comonomers, also known as linear low density polyethylene. in recent years, various low pressure processes he developed rapidly. medium pressure only philip company is still in use, the production is mainly high density polyethylene. the method of polymerization of ethylene into low density polyethylene by using oxygen/peroxide as a initiator in high pressure method. ethylene through two stage compressed into the reactor (figure 3), under the pressure of 100 ~ 300mpa, the temperature of 200~300 deg c&under the action of the initiator for the polymerization of polyethylene, the reaction by decompression separation, the unreacted ethylene recovery after recycled polyethylene melt like in adding plastic additives after extrusion granulation. (see pictures) used in polymerization reactor has a tubular reactor (length of 2000m)&reactor two. the single pass conversion rate of tube method is 20% ~ 34%,&the single line annual production capacity is 100kt. the one way conversion rate of the reactor was 20% to 25%,&the single line annual production capacity was 180kt. the low pressure method is divided into three kinds of slurry method, solution method&gas phase method. in addition to the solution method, the polymerization pressure is below 2mpa. the general steps include the preparation of the catalyst, the polymerization of ethylene, the separation of the polymer&the granulation. 1. the polythene produced by the slurry method is insoluble in the solvent&is in the form of slurry. the slurry polymerization conditions are mild&easy to operate. alkyl aluminum is used as activator, hydrogen is used as molecular weight regulator,&most of the reactor is used. the polymer slurry produced by the polymerization kettle passes through the flash kettle, the gas-liquid separator to the powder dryer,&then the granulation (figure 4). in the process of production, the process of solvent recovery&solvent refining are also included. the products with different molecular weight distribution can be obtained by the combination of different polymerizer in series/in parallel. 2. the solution was polymerized in the solvent, but ethylene&polyethylene were dissolved in the solvent,&the reaction system was homogeneous solution. the reaction temperature (140 deg c), high pressure (4 ~ 5mpa). characterized by short polymerization time&high production intensity, it can produce three kinds of polyethylene with high density, medium&low density, which can control the properties of products better. however, the molecular weight of polymer obtained by solution method is low,&its molecular weight distribution is narrow&solid content is low. (3) the gas-phase polymerization of ethylene in the gaseous state is generally used as a fluidized bed reactor. the catalyst has two kinds of chromium&titanium, which are added into the bed by the storage tank. the high speed ethylene cycle is used to maintain the fluidization of the bed&eliminate the polymerization heat. the generated polyethylene is discharged from the bottom of the reactor (figure 5). the pressure of the reactor is about 2mpa,&the temperature is 85~100. gas phase method is the main way to produce linear low density polyethylene. gas phase method ses solvent recovery&polymer drying process,&ses 15% of investment&10% of operation cost than solution method. 30% of the investment for the traditional high pressure method, the 1/6 of the operation fee. therefore, it has been developed rapidly. however, the gas phase method should be further improved in product quality&variety. medium pressure is used as a chromium catalyst supported on silica gel. in the loop reactor, ethylene is polymerized under medium pressure to produce high density polyethylene (hdpe). the processing&application of ailable blow molding, extrusion, injection molding method, widely used in the manufacture of thin film, hollow fiber&other products, daily-use sundry goods. in actual production, in order to improve the stability of ultriolet&oxidation of polyethylene&improve the processing&use performance, a small amount of plastic additives should be added. the usual ultriolet absorbent is two benzophenone/its alkoxy derivatives,&carbon black is an excellent uv shielding agent. in addition, antioxidants, lubricants, colorants&so on, so that the application of polyethylene to expand the scope of [1].
pp丨 j945丨曉星<物性表>pa66 h2-v0,、eva ef221、coc 6013f-04,、pa12 pd100,、asa s310、pp r200p-g20n,、pps hmr60fc,、pc 2205、pc e2000u,、
pc ml-300、pp mf002s ppo int1001,、pp rp400d,、tpee g3548l,、tpu es85a15000、poe df640,、tpv 8281-75med,、pom l0-21、pbt tv6220,、
pc 19p fb51,、pp 30mb666、pa/mxd6 n-252a
明一
|
登錄后臺(tái)
滇公網(wǎng)安備 53011202000392