東莞市千泰塑膠原料有限公司為您提供唐山pvdf/3383抗張,。唐山pvdf/3383抗張
hdpe hdpe is a kind of high crystalline&nonpolar thermoplastic resin. original hdp
high density polyethylene detail picture
the appearance of e is milky white&has a certain degree of translucent in the thin section. pe has the characteristics of excellent resistance to most of the living&industrial chemicals. some kinds of chemicals can produce chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene)&halogenated hydrocarbons (carbon tetrachloride). the polymer is not hygroscopic&has good waterproof steam property. it can be used for packaging. hdpe has good electrical properties, espe-lly high dielectric strength, so it is very suitable for wire&cable. the medium to high molecular weight class has excellent impact resistance, which is the same at normal temperature&even at low -40f temperature. the unique characteristics of various levels of hdpe are the proper combination of four basic variables: density, molecular weight, molecular weight distribution&additives. different catalysts are used to produce customized polymers. these variables are combined to produce different uses of the hdpe grade; the best balance is achieved in performance.
density
this is the main variable that determines the hdpe characteristics, although the 4 variables mentioned are indeed interacting with each other. ethylene is the main raw material of polyethylene. a small number of other comonomers, such as 1 butene, l hexene/1 octene, are often used to improve the performance of polymers. the content of hdpe above a few monomers is generally not more than 1% - 2%. the crystallinity of the polymer was slightly reduced by the addition of the
ldpe the gap between the die&the die must be widened to avoid reducing the output due to the high back pressure&the melt fracture. the general gap sizes of ldpe&lldpe are o.024 - 0.040 in.&0.060 - 0.10in, respectively.
the "extended softness" of lldpe is a drawback in the film blowing process. the bubble film of lldpe is not as stable as ldpe.
the normal single lip wind ring is stable to the ldpe, which is sufficient to use.lldpe specific vesicles to require more perfect lip wind rings to stabilize. cooling the internal vesicles with a double lip ring can increase the stability of the membrane&improve the production capacity of the film at the same time. in addition to the better cooling of the film, many film manufacturers use ldpe blending to enhance lldpe solubility. the extrusion of lldpe can be completed on the existing ldpe film equipment, when the lldpe concentration of ldpe blend reaches 50%. when processing 100% lldpe/lldpe rich blends with ldpe, the general ldpe extruder is used,&the equipment must be improved.
anti vermicular denaturation
the polyethylene environmental stress cracking resistance&creep resistance
dielectric properties
pure polyethylene does not contain polar genes, so it has good dielectric properties. the molecular weight of polyethylene has no influence on the dielectric properties of polyethylene, but if they contain impurities, such as the presence of polar groups&metal catalyst, ash molecules (hydroxyl, carbonyl), the dielectric properties such as dielectric constant, dielectric loss (dielectric loss tangent)&other adverse effect.
application area
lldpe is the main field of application of plastic sheeting, packaging film, wire&cable, pipe, coating products etc..
linear low density polyethylene (ldpe) is mainly used in the manufacture of thin film because of its high tensile strength, better resistance to puncture&tearing resistance. in 2005, the consumption of lldpe in the world was 16 million 170 thousand tons, up 6.4% from the same period. in the consumption structure, thin film products still account for the largest proportion, consumption is 11 million 900 thousand tons, accounting for 73.6% of the total consumption, followed by injection molding, consumption is 1 million 148 thousand tons, accounting for 7.1% of total lldpe consumption.
in 2005, the total consumption of lldpe&ldpe in china was 5 million 980 thousand tons, of which lldpe consumption was 3 million 550 thousand tons, an increase of 25.4% over the previous year, accounting for 59.4% of total lldpe/ldpe consumption,&ldpe consumption of 2 million 430 thousand tons, an increase of 0.7% over the previous year, accounting for 40.6% of the total consumption of lldpe/ldpe.
from the lldpe/ldpe consumption structure, the film is still the largest consumer of consumption, with a consumption of 4 million 850 thousand tons. from the consumption situation of lldpe/ldpe in the past 2003~2005 years, the consumption ratio of thin film has been maintained at around 77%,&the consumption proportion of second kinds of injection molded products has been lingering 9%. within the next 2~3 years, although the absolute consumption of various varieties will continue to grow, but the proportion of consumption will maintain the current basic situation; because the packaging film needs relatively rapid growth, agricultural consumption ratio will be reduced to about 20%. as the performance of lldpe continues to improve, its application field is also expanding,&the demand for lldpe in the future market will be greatly higher than that of ldpe&hdpe.
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