| The modification of PE, PP and PS were studied in this paper.The modification of PE. PE-X pipe was studied. The most domestic markets of PE-X pipe are occupied by imports. Quatities of domestic PE-X pipes are not stable. The index of basic resin of PE for PE-X pipes is not released. The paper starts to research the development of the basic resin for PE-X in order to solve the problem. The elections and components are studied about basic resin, initiator, graft agent, catalyst, lubricant and so on. PE-X-Si was made by one step process that all of materials such as PE, initiator, graft agent etcetera are added directly to twin screw extruder. The basic resin for PE-X pipe was tested by means of Nuclear Magnetism Resonance (NMR), Infrared Ray Spectrometer (IR), Differential Scanning Calorimetry (DSC), MFR etc. The index of basic resin of PP for PE-X pipes are worked out. Meanwile, the compound foumular system are came out.The modifications of PP include transparence, PPR pipe, non-woven fabrics and BOPP.The first, the modification of PP transparence was studied. The structure of PP consists of crystal and no crystal. The transparence of PP is bad. So, this paper start to improve the haziness of PP. The transparence of PP was improved clarity by blending the suitable PP basic resin, clarity additives and dispersants. The special resin of high CPP has been developed and produced by choosing the most feasible basic resin, clarity additives and dispersants. It was found that the performance of CPP corresponds to oversea cpp's. The basic resin is random co-polymer PP, clarity additives made in America in 0.3%, suitable dispersant added in 0.05%.The second, PPR pipe was studied. The structures and properties of random co-polymer PP(PPR) were charactered by means of Nuclear Magnetism Resonance (NMR), X-Ray Diffraction (XR), differential scanning calorimetry (DSC), Gel Penetration Chromatogram(GPC), Infrared Spectrometer(IR) etc. comparing oversea's. The results show that the special resin for PPR pipe has the typical structure of random co-polymer. The structure of PPR pipe consists of PPE (8.1%),PEP (3.8%),EEE (0.3%) and so on. The size of crystal lessened, the crystal degree, speed and the melt temperature reduce for the sake of ethylene inserted randomly while propylene was polymerized. It possesses the high impact strength, low brittle temperature, strong chemistry stabilization, good processing properties etc. This fact indicated that the structures and properties corresponds to the oversea resins.The third, non-woven fabrics HY525 was studied. The demands of non-woven fabrics for super high- speed are getting more and more in domestic market while rapid development of industry of non-woven fabrics. However, there are not domestic non-woven fabrics for super high-speed except imports. So, this paper research HY525 which is new band of PP non-woven fabrics special resins for super high- speed. PP T30S powder as basic resins are blended by degradation to produce degradation matrix. The matrix are added to screw extruder in which matrix are blent with T30S to come out non-woven fabrics for super high- speed, with the melt flow 43-55g/10min. The studying result shows that MFR is linear relation to degradation concentration (under 1200ppm). Suitable degradation and suitable concentration of matrix are elected. Processing conditions of matrix are confermed. Temperature of screw are controlled between 120-160℃. The frequency of screw are between 70-90rpm.The forth, BOPP was studied. The markets of better quality BOPP are mostly occupied by imports. The paper research structrures and properties of 8 kinds of BOPP from China and abroad. A new brand T38FE of BOPP is designed. The indexes of T38FE are MFR 2-4g/10min, isotacticity 95-97%, ethylene component 0.2-0.5%, molecular distribution 5.0-8.0, tensile strength≥30Mpa, ash≤200ppm etc.. CS-2 catalyst is selected as main catalyst. The performance of T38FE was analyzed by DSC, GPC,13C-NMR, IR etc.The wide film of BOPP is 8 meters and speed 450m/min. The fact indicated the main controllable properties correspond to the oversea resins, such as the degree of isotactic, the molecular weight and molecular weight distribution, MFR, ash content etc.The modifications of PS include GPPS and HIPS.Firstly, the modification of HIPS was studied.The development of the HIPS2757 special resin for refrigeratory. HIPS can not meet the needs of refrigeratory inner component because the toughness of HIPS is not enough. The toughness of HIPS was improved by physical blending, adding toughness agent (SBS), additives and inorganic fillers. The study shows that toughing properties were improved more than two times by adding good proportion of toughness agent etc. The suitable temperatures of twin-screw are controlled in the first zone 205℃,the second zone 215℃,the third 230℃and the fourth 230℃,the end of model 205℃. HIPS2757 has been meeting the needs of making refrigeratory.Secondly, the modification of GPPS was studied. In the past modification of transparent polystyrene, the toughness of GPPS was improved but the transparency decreased significantly. The paper study a new way to modify GPPS, which can improve toughness of GPPS significantly and keep the high transpanrency of GPPS. The modification of transpanrent polystyrene in impact strength is that styrene and butadiene copoly to produce styrene-butadiene resin SBC-01 and SBC-03 in cyclohexanone as solvent with butyli as initiator. Random PS,random SB and activator component are three factors of affecting impact strength of SBC-03. Molicular distribution and processing conditions are tow factors of affecting haziness. Styrene-butadiene resin has high impact strength and transparence. The properties of SBC-03 are as the same as overseas's KR-03. So, styrene-butadiene resin enlarge the application fields of transpanrent polystyrene. |
