東莞市千泰塑膠原料有限公司為您提供pp//sm840/變現(xiàn)。pp//sm840/變現(xiàn)
lldpe with the continuous improvement of peoples living standard, it will inevitably bring different demands&improvements in all aspects of culture, entertainment, food, medical treatment, materials, room decoration&so on. more&more transparent materials are used in many markets. therefore, the development of transparent pp spe-l materials is a good trend, espe-lly for pp spe-l materials with high transparency, good fluidity&fast molding, so as to design&process pp products that are popular with -s. transparent pp has more features than ordinary pp, pvc, pet&ps,&has more advantages&development prospects.
in recent years, foreign transparent pp market is growing rapidly, such as south korea will be transparent pp as pet alternatives to the market; some companies in germany to replace pvc with a transparent pp transparent pp products; the growth rate is higher than the ordinary pp products 7%~9%; japan in recent years pp nucleating agent the annual amount is about 2000t, if adding 0.25% projections, japan transparent pp material up to the annual output of more than 800 thousand t. according to the japanese physicochemical co., ltd., japans transparent pp spe-l materials used in microwave cookers&furniture in two aspects of the largest consumption. it is expected that in 2005, the demand for transparent pp spe-l materials in foreign markets is about 5 million ~550 million t. at present, the gap between foreign transparent pp spe-l materials&foreign countries is large,&the production&application of transparent pp resin&its products still need to be strengthened.
other
1. uniaxial tensile pp films
the process flow is as follows: proportioning, plasticizing, extrusion casting of t type head, cooling, corona treatment, traction, coiling, aging treatment, sub cutting,&finished products.
the screw speed of 60 rpm, 180, 220, 240, the temperature of 250 deg c, traction speed 80 m / min,&the cooling temperature of 30 deg c, the surface tension of 42 dyn / cm.
hdpe product performance
high density polyethylene is non-toxic, tasteless, odorless white granule, a melting point of 130 deg c, relative density is 0.946~0.976g/cm3, it has good heat resistance&cold resistance, good chemical stability, also has high rigidity&toughness, good mechanical strength, dielectric properties, resistance to environmental stress cracking resistance is also good.
application
it is used for extrusion packaging films, ropes, weaving nets, fishing nets, water pipes, injection moulds, lower grade daily necessities&shells, non load-bearing components, plastic boxes, turnover boxes, extrusion blow molding containers, hollow products, bottles.
for blow molding products&film products such as food packaging bags, shopping bags, sundry goods, fertilizer lined film etc..
national standard
serial number item index ldpe lldpe eva hdpe
common environmental protection
1 thickness mm 0.2-3.0 0.2-3.0 0.2-4.0 0.2-4.0
2 width m 2.5-9.0 2.5-9.0 2.5-8.0 2.5-8.0
3 tensile strength (vertical&horizontal) mpa
more than 14 more than 16 >=17 >=25
4 elongation at break (vertical&horizontal)% >=400 >=700 >=550 >=450 >=550
5 right angle tearing strength n/mm >=50 >=60 >=60 >=80 >=110
6 water vapour permeability coefficient of g. cm/c.s. pa <1.0*10 <1.0*10 <1.0*10 m - --
7 the temperature range of +70 deg c -70 +70 deg c -70 deg +70 deg -70 deg c - --
8 carbon black content% -- - -- - - 2.0-3.0
9 environmental stress cracking resistance f -- -- -- -- >=1500
low temperature impact embrittlement at 10-70 c -- -- -- -- through pass
oxidation induction time at 11200 c -- - --
main characteristics
ldpe low density polyethylene (ldpe), also known as high pressure polyethylene, is a plastic material. it is suitable for various forming processes of thermoplastic molding, with good processing performance.
the main purpose of ldpe is to make film products,&also for injection products, medical equipment, medicine&food packaging materials, blow molding hollow molding products&so on.
sex low density polyethylene (english: linear low density polyethylene for short, lldpe,)
linear low density polyethylene (lldpe), is a senior of ethylene&alpha olefins (such as -1, -1, butylene hexene octenes methylpentene -1, four -1) in the presence of catalyst, a copolymer with high/low pressure polymerization, the density is between 0.915 ~ 0.940 g / cm3. however, according to the d-1248-84 of astm, the density range of 0.926 ~ 0.940 g / cubic centimeter belongs to medium density polyethylene (mdpe). the new generation of lldpe expands its density to plastic (0.890 to 0.915 g / cubic centimeter)&elastomer (<0.890 g / cubic centimeter). but the american plastics industry asso-tion (spi)&the american plastic industry commission (apc) only extend the scope of the lldpe to the plastic, not the elastomer. in the 80s of last century, union carbide&dow chemical referred to their early sales of plastically&elastomers as very low density polyethylene (vldpe)&ultra-low density polyethylene (uldpe) resin.
the molecular structure of conventional lldpe is characterized by its linear main chain, with only a small amount/no long branched chain, but contains some short branched chains. without long branching chains, the crystallinity of the polymer is higher.
generally, lldpe resin is characterized by density&melt index. the density is determined by the concentration of the copolymerized monomer in the polymer chain. the concentration of the copolymers determines the amount of short branched chains in the polymer. the length of a short branched chain depends on the type of the monomers. the higher the concentration of the copolymers, the lower the density of the resin. in addition, the melt index is a reflection of the average molecular weight of the resin, which is determined mainly by the reaction temperature (solution method)&the addition of the chain transfer agent (gas phase). the average molecular weight is independent of the molecular weight distribution,&the latter is mainly influenced by the type of catalyst.
lldpe was industrialized by union carbide in 1970s. it represents a significant change in polyethylene catalyst&process technology, - the product range of polyethylene expand significantly. lldpe instead of free radical initiator&low cost gas phase polymerization instead of free radical initiator, instead of high cost reactor, in a relatively short period of time, it has replaced ldpe in many fields due to its excellent performance&low cost. lldpe almost penetrates into all the traditional polyethylene markets, including films, mouldings, pipes&wire&cables.
lldpe products are nontoxic, tasteless&odourless,&are milky white particles. compared with ldpe, it has many advantages, such as high strength, toughness, rigidity, heat resistance&cold resistance. it also has good resistance to environmental stress cracking&tear strength,&it can resist acid, alkali&organic solvents.
in 2005, chinas lldpe production was 1 million 880 thousand tons, accounting for about 35.5% of the total output of pe,&3 million 550 thousand tons of consumption, accounting for 33.8% of the total consumption of pe. it is expected that in the next 2~3 years, the consumption of lldpe will continue to grow at about 8%. according to the current market price of 12000 yuan / ton, the market size of chinas lldpe has exceeded 40 billion yuan.
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