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High-flowable LDPE  #9(115), 2012

The Polymir plant of the JSC Naftan is the sole manufacturer of LDPE grades with the high MFR values in the CIS countries. The family of polyethylenes produced by Byelorussian enterprise was expanded by high-flowable LDPE of 12203-250 grade

Melt flow rate of the new LDPE grade, namely 12203-250, is 2-3 times higher than that of the other high-flowable grades of high pressure PE, produced in the past and nowadays in the former Soviet Union. At that LDPE of the 12203-250 grade retains all the basic properties of high pressure polyethylene - high resistance to corrosive media and solvents as well as dielectric properties.

LDPE of 12203-250 grade has passed sanitary and hygienic tests and is allowed for production of food-contacting articles and toys. Due to high MFR value the 12203-250 grade has expanded application scope and can be processed by conventional methods (extrusion, molding, casting, pressing, spraying) and used for production of highly filled masterbatches and compounds.

High flowability of the LDPE grade 12203-250 improves the performance of extrusion and molding equipment for production of a wide range of products and provides a uniform absorption of LDPE melt of a large number (up to 60 percent) of various additives, making possible to produce on the basis of this brand the highly filled compositions with a wide range of properties - first of all, pigments’ masterbatches. These materials are always advantageous, as soon as are used for conventional dyeing of all kinds of plastic products, as well as for dyeing with special effects - fluorescent, pearlescent, metallic.

LDPE of 12203-250 grade differs from traditional base brands by good rheology (flowability) and the distribution within it of mineral and organic fillers. As a result, the 12203-250 grade can be processed at lower temperatures and pressures that cause essential reduction of energy consumption in production, as well as requirements to service maintenance of processing equipment. This grade can also be used for lamination of paper, cardboard, cloth for coating various products. It can be used in potting compounds to fill in the parts of electrical equipment, as well as for manufacture of highly elastic products.

LDPE of 12203-250 grade is produced according to Specification BY 300042199.111-2010, “High pressure polyethylene of 12203-250 grade”, and is analogue of grade 12003-200, manufactured according to State Standard 16337.

 

Table 1. Quality factors of LDPE 12203-250 grade according to Specification


Factor name

Rate by Specification

Density, g/cm3

0.9160±0.002

Melt flow rate (nominal value), g/10 min, with a tolerance in %

25.0±20

Dispersion of melt flow rate within a batch, %, not more than

±5

Number of inclusions, pcs, not more than

2

Mass fraction of extractable substances, %, not more than

1.4



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