PP RP100W130〓PP RP100W130 →，TPCPB420-B 、‖。PBT RS1203 PP SB9310 TPE 1030D 、→，PA6 73G15L 、‖。PA6 1943 、→，CA199AC PBT 3105 、‖。PA66 6410G5 PP C343T4 HDPE 6100B 、→，PC EHR3400 POM 450UV-D POM S27064XAP2 PP 3600 PC DX09301C 、‖。 660 、‖。TPE FX-9090UE 、‖。PPS 1140L4-SF3001 、‖。PC EXL8134 、‖。PMMA ZK6HC LLDPE 222W 、→，PA6 B3WG6CR PA/MXD6 1022-0006 、‖。PMMA 7N 、‖。TPE TS6ACZ PA6 PFB42EU PA6 PFB55 PC HPS1R-1124 PC KGN-30MRA 、→，PBT B1305 、‖。PA6 ST120NAT 、‖。PC MN-3710S 、‖。PA66 3024G-45 NC 、→，PMMA ZK5BR PBT B4406G3 PC DFL-34EXP 、‖。 PA-541 TPU S-190A SURLYN 1601 、‖。PC 2608 PC DE004ERP POM GF705 POE XM7080 PA9T GP2450NH 、‖。PA6 KN133MT40 、‖。ASA 778T UV 、‖。PP 6614 、→，GPPS 145D PBT BF4222 PA66 FR370 、→，PA66 RA844 LDPE PEFA5230 、→，LLDPE SP2020 、→，PA66 GF40-01 、‖。PA66 HF3074G30 、→，TPU 1160D 、‖。PA46 TS256F8 PC DBL4034 LDPE 2008TN00 、‖。PP 70PXS 、→，TPEE YL003 COC G7810 、‖。PPE X1762 PA66 KN333HB30BL ABS AF-1006-BL5-376 TPE TC8AAZ-S340 、→，PTFE F-205 HDPE HE3494-LS-H PP RP312M PC/ABS 7410 、→，K(Q)膠 SL-803G PBT 3316HR PPS CZ-1030 、‖。PBT 462 、→，THV FC2123 、→，PP SFC-750D 、→，XLPE LE4212R 、→，PBT UT 4045 、→，EVA VE700 PP H2220 LCP A515D-2 BK 、→，TPU 11T80 PP P9435 M、→，PPS FM-MK124 、‖。TPU 45-60/25 、‖。PC F23R PP H303-02 HDPE HD5620 LDPE RCP770C/CW PPS GP4600LG 、→，TPEE VT3108M 、→，PC/ABS XT50 PC Rx1452 PC/PBT 5220 、‖。PP 73F4-4 、‖。TPU 5717 TPU UD-66D10 、‖。ASA/PC TA-15 HB 、‖。TPU 5799 PBT 5010R3-2 PA66 PA830 、→，EVA AFDP1171/1/270 PA6 T-422VOR HDPE BM3245 、‖。ABS 755A PA66 RX09411H 、‖。POE DF740 、‖。TPU US106B HDPE DMDC-1210NT7 PP T131N 、‖。PA6 K224-LGM35 HDPE AA48-002 、→，EVA D5010 、→，TPO 277P EVA UL 05540EH2 TPU 64DC PC G4F22R 、‖。TPEE 447 、→，PC K-30UVR MPE 3527PA PC/、‖。PA66 K224-HG6 PBT WFL28 ABS XG-570 、‖。POM UV25Z 、‖。TPE TS5ACZ PA6 6GF30GID 、‖。PC HN-3102G EVA 560A PA6 1330GF PMMA MD 、‖。PA66 R2000 、‖。PPS OE003A 、 EVA prospect For the domestic market in terms of medium density polyethylene (MDPE) seems to be a new term, but because the performance between high density polyethylene (HDPE) and low density polyethylene (LDPE) between the two, while maintaining the rigidity of HDPE and LDPE, flexibility, creep resistance, in both the merits.soon, absolute the advantage in the gas pipes, water pipes, and communication cable sheath, so more and more attention by the market. The unique properties of established market position: MDPE because of its good resistance to environmental stress cracking resistance, weldability and long service life etc. in recent years, the rapid development of application, the amount of increase quickly, MDPE is considered to be the world's most suitable communication cable, fiber optic cable with sheath material. In foreign countries, the development of MDPE is synchronized with LDPE and HDPE. Dow Chemical Co., Ltd. adopts I nsite Technology　 In Europe, MDPE has established a dominant position in the air distribution and water distribution pressure tube market. MDPE has the great potential to enter the metal and PVC territory in the field of large diameter gas distribution (outside diameter 100mm), gas pipeline (outside diameter 300mm?or?above) and water distribution pipe (outside diameter 200mm?or?above). In terms of water distribution, the amount of MDPE in Europe is 160 thousand tons. The pace of domestic R & D is accelerating: the development of MDPE resin in domestic market is lagging behind, and there are not many products in the market. Most cable sheathing manufacturers can only use the way of blending. Maoming petrochemical and Zhongyuan ethylene company introduced MDPE products in all density polyethylene production plant, such as tube material DGDA-2401 and DNDD-7152 for rotary molding, but they yield very little. The introduction of new Yanshan Petrochemical Company 200 thousand tons / year production of LDPE EXXON chemical company in 3 grade of MDPE (117, 151, 157), the density values in the range of 0.9280g/cm ~ 0.9355g/cm 3, has produced two grade 117 and 151 600 tons of products, but the product density is low, and non copolymer products, environment resistant stress cracking performance is poor, not suitable for the production of pressure pipes such as gas pipes etc.. In 2004, Shanghai Petrochemical Co launched the 250 thousand ton / year polyethylene plant with the Nordic chemical Shuangfeng polyethylene technology, which can produce PE100 pipe special material, but the product grading work can also be completed by 2004, which means that the raw materials currently used in China still need to import. The market demand potential is considerable: at present, the field of MDPE in China includes wire and cable sheathed materials, water conveyance pipelines, buried gas pipelines and agricultural irrigation hoses (belts), and the demand for them is bigger and bigger. Most manufacturers use HDPE plus LDPE MDPE communication cable, optical cable sheath material, the annual output of 30 thousand tons; the gas pipe material has good welding resistance, rapid transfer of environmental stress cracking resistance and cracking, the manufacturers are using imported MDPE materials; agricultural irrigation hose (with) applications in the field of is MDPE, in order to reduce the price of production cost control, which are currently only a few manufacturers using imported MDPE, most of the domestic LDPE and LLDPE, individual manufacturers to add a small amount of HDPE blends to improve the stiffness of the world; the best recognized hose reel automatic sprinkler irrigation machine is a kind of suitable for China's national conditions, PE hose the winding machine not only to withstand the bending, tensile stress and internal pressure, but also resistance to ground friction, sun and rain, alternating hot and cold comprehensive effect, foreign The MDPE tube has been developed to synchronize the service life of the hose with the sprinkler. In the middle and late 80s of China, this kind of sprinkler was developed. And with the matching quality of the MDPE hose has not yet been successfully developed reports, the market demand is about 20 thousand - 30 thousand tons / year. The development of West to east gas transmission project and the west to East power transmission project and the construction of urban natural gas transmission pipeline network, urban and rural water conveyance and gas pipeline network construction and the position of China's agricultural giants all depict a brilliant prospect for the PE family's new favorite -- MDPE and its products. But at present, for the domestic market, domestic users either from the rational?or?perceptual knowledge of MDPE is not enough, but through propaganda and development of MDPE brand strength, believes MDPE has been gradually known at the same time, also for the construction and development of the country to make more outstanding contributions. [2-3] EMA In recent years, special products have become the focus of HIPS product development. The newly developed HIPS products can compete with engineering plastics in some applications, there is much higher than the quality of the products, instrumentation and consumer electronics products HIPS is one of the growing market, including small instruments, and the internal parts of the inner wall of the refrigerator, air conditioning, TV shell parts, business machines and video cassette recording. The special grade HIPS resin has replaced the high price engineering plastics in many fields. An ultra-high impact strength and high temperature HIPS has even been used as automotive interior parts. GPPS GPPS plastic is a general class of polystyrene (GPPS) polystyrene (PS) is composed of styrene monomer (SM) polymerization, can be formed by a variety of synthetic methods of polymerization, polymerization industry at present mainly by bulk polymerization and suspension polymerization. The English name of polystyrene is Polystyrene, PS (hereinafter referred to as PS). PS is a thermoplastic noncrystalline resin, which is mainly divided into universal polystyrene (GPPS, commonly known as benzene), impact resistant polystyrene (HIPS, commonly known as benzene modification) and foamed polystyrene (EPS). PVC Polyvinyl chloride (PVC) waterproofing membrane The cauldron is the main equipment, which is made of stainless steel?or?enamel lined with steel kettle, equipped with agitator and heat transfer jacket for controlling temperature,?or?internal cooling pipe, reflux condenser and so on. In order to reduce the production cost, the volume of the reactor has expanded from several cubic meters to a dozen cubic meters. The largest volume has reached 200 cubic meters. When the polymerizer is used many times, it needs to be descaled. PVC, made of polyvinyl alcohol and cellulose ether as suspended stabilizer, is generally loose, porous and large in surface area. It is easy to absorb plasticizer and plasticizing. 2. One of the earliest methods of industrial production of PVC by emulsion polymerization. In emulsion polymerization, water and vinyl chloride monomer, and adding sodium dodecyl sulfonate surfactant as emulsifier, monomer dispersed in the aqueous phase and emulsion, water soluble potassium persulfate and ammonium persulfate as the initiator, can also lead to the system of "oxidation reduction". Polymerization process and different suspension method. There are also polyvinyl alcohol as emulsifying stabilizers, twelve alkyl mercaptan as a regulator, sodium bicarbonate as a buffer. There are three kinds of polymerization methods: batch method, semi continuous method and continuous method. The polymerization products are latex like, and the particle size of the emulsion is 0.05 ~ 2 m, which can be directly applied?or?dried by spray to form a powdery resin. The polymerization period of emulsion polymerization is short and easy to control. The resin obtained has high molecular weight and even degree of polymerization. It is suitable for PVC paste, artificial leather?or?impregnated products. The formula of emulsion polymerization is complex and the content of impurities is high. (3) the polymerization device of bulk polymerization is more special, mainly composed of a vertical prepolymerization kettle and a horizontal polymerizer with a frame type agitator. Two stages of polymerization are carried out. The monomer and initiator first polymerized 1h in the pre polymerization kettle to generate seed particles, and the conversion rate was 8% to 10%. Then it entered the second stage polymerizer and added the monomer with the same amount of prepolymer to continue polymerization. The conversion rate is 85% to 90%, the residual monomer is discharged, and the finished product is then crushed and sifted. The particle size and shape of the resin are controlled by the stirring speed, and the reaction heat is produced by the reflux of the monomer. The production process of this method is simple, the quality of the product is good and the production cost is low. PVC modification method