连云港PTFE/D/W211插件

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ldpe prospects for development
at the end of 1984, the co carbon company introduced the production of hexene copolymerized lldpe, followed by exxon, mobil&other companies. dow chemical (dow chemical company) almost used octylene as comonomer in its low pressure solution process,&nova canada (nova chemical) also used octylene in most of the pressure solution process. the copolymerization of octyl lldpe resin has a little good strength, tearing resistance&processing property, but the properties of hexene copolymerization&octyl copolymers have little difference. hexene lldpe resin manufacturers including exxonmobil chemical (exxon mobil chemical company), eastman chemical (eastman chem co), equistar (star company)&chevron phillips (chevron phillips chemical company) etc.. in addition, dow chemical (dow chemical company), basell (basel company),
application of low density polyethylene
innovene, samsung (innovene company) total (samsung total) also produce 1-hexene lldpe.
compared with the commonly used butene copolymers, the lldpe produced by hexene&octene as copolymerized monomers has better performance. the largest use of lldpe resin in film production, with a long chain alpha olefin (such as cyclohexene, 1-octene) as comonomer production of lldpe resin&film products in the tensile strength, impact strength, tearing strength, penetration resistance, environmental stress cracking resistance&many other aspects are better than by butene as comonomer to produce lldpe resin. since 1990s, pe manufacturers&users in foreign countries tend to replace butylene with hexene&octene. it is reported that using octene as comonomer, the performance of resin is not necessarily better than that of hexene copolymerization,&the price is more expensive. therefore, the trend of using lldpe abroad to replace butene is more obvious.
because there is no large-scale production of hexene&octene in china,&the import price is more expensive, the lldpe resin currently used in china is mainly used as butene as comonomer. some enterprises in china used the lldpe as the monomer of the comonomer when they introduced the production plant, but they had to give up because of the production of no hexene in china,&only imported a small amount of hexene when driving. most of the high-end lldpe imported from china are such products. it is expected that in the future, there will be a greater increase in the demand for lldpe with 1- hexene as a monomer.
pc resin is a polar non crystalline polymer, density: 1.380 g/cm3, glass transition temperature: 87 degrees c, so the thermal stability is poor, not easy to process. can not be used directly, must be modified mixing, adding related additives&filler can be used. it is determined that the properties&requirements of the prepared pvc materials are different because of the different kinds&fractions of the additive&filler. we usually call it a pvc formula, which is strictly a pvc modified formula,&pvc is only modified to use. this class is often classified as polymer modified material. the modification of polymer materials mainly revolves around the high performance of general plastics, the conversion of single component materials to multi component materials&co-ites,&the functionalization&optimization of materials. in general, pvc should be modified to granulate first,&after the formation of particles by screw extruder, the plasticization is more sufficient&the processing is easier, espe---lly the process is the injection product. the screw extruder is one of the most important equipments in plastic molding. it is used for solid conveying, compaction, melting, shearing&mixing extrusion of plastics through external power transmission&heat transfer of external heating elements. screw extruders play an important role no matter as plasticizing&granulating machines/molding machines. strictly speaking, there are spe---l requirements for pvc products. pvc modified formula is made according to customer requirements. there are also copolymerization in the pvc production process, such as vinyl chloride copolymers, pvc blends,&chlorinated polyvinyl chloride (pvc) [3].
performance indicators of pvc modification
colourability
the thermal stability&light resistance of pvc are poor. hydrogen chloride was deco-ed at 150 c, with the adverse reaction of the plasticizer content. in addition, the influence of pigment on pvc is reflected in whether pigment is reacted with pvc&other components of pvc products,&pigment itself is resistant to migration&heat resistance. some of the ingredients in the coloring agent may cause the degradation of the resin. for example, iron ions&zinc ions are the catalysts for the degradation of pvc resin. therefore, the use of iron oxide (red, yellow, brown&black) pigment/zinc oxide, zinc sulfide&white pigment lithopone will reduce the thermal stability of pvc resin. some of the coloring agents may be asso---ted with the degradation products of pvc resin. such as ultramarine pigment acid resistance is poor, so in the pvc coloring process, with the pvc deco-ition of hydrogen chloride produced by the interaction of losing their color. therefore, as far as pvc coloring is concerned, the characteristics of the resin&related auxiliaries are considered,&the characteristics of the pigments are combined. the following problems should be paid attention to when choosing a colorant. [4]
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