High-concentration carbon black master batch for polyethylene geomembrane

Abstract

The invention discloses a carbon black master batch for a polyethylene geomembrane. The carbon black master batch is composed of, by weight, 23%-40% of high-density polyethylene resin, 4%-12% of linear low-density polyethylene resin, 48%-55% of carbon black, 7%-10% of antioxygen and 0.05%-2% of fluorocarbon polymer. The master batch and a material special for the polyethylene geomembrane are used for conducting melt blending, and thus a geomembrane product capable of meeting GB-T 17643-2011, GM13, CJ 234 standard requirements can be obtained through squeezing or blowing. The geomembrane product prepared through the method has excellent performance on the aspects of tensile yield strength, anti-UV intensity and the like.

Description

technical field [0001] The invention relates to a polyethylene carbon black mother, in particular to a carbon black mother for polyethylene geomembrane. Background technique [0002] Polyethylene geomembrane is a new type of environmentally friendly material developed in recent years. Widely used in landfills, large-scale water conservancy projects and other fields, such as the Three Gorges Project, Qinshan Nuclear Power Project, Yangtze River Estuary Regulation Project, Yellow River Control Project, Huaihe River Control Project, Beijing-Hangzhou Grand Canal, large-scale Yellow River Diversion Plain Reservoir Project, and river flood control and emergency rescue, etc. . In recent years, with the introduction and development of high-speed railway technology in my country, polyethylene geomembrane products have been widely used in the construction of high-speed railways in my country as the sliding layer of CRTSII slab ballastless track for passenger dedicated railways. [0...

AI Technical Summary

Problems solved by technology

Due to the low strength of LDPE, adding this color masterbatch to polyethylene geomembrane will greatly reduce the tensile strength of geomembrane

2) More importantly, the matrix resin only considers the selection of a single polyethylene resin with good flow, ignoring the stress cracking resistance of the geomembrane after adding it, which leads to a significant decline in the stress cracking resistance of the final product and cannot meet the requirements of more than 50 years. service life

3) The content of carbon black in the carbon black masterbatch is low, generally not more than 40%, which cannot meet the needs of geomembrane manufacturers

4) Consider the impact of carbon black particle size on the performance of the final product. If the carbon black particle size is too large, it will cause a large amount of stress concentration in the geomembrane and reduce the service life of the product

5) Carbon black masterbatch does not add antioxidants or does not have a reasonable antioxidant system (such as using only a single antioxidant), which cannot meet the requirements of the final product oxidation induction time greater than 100min and thermal oxygen aging resistance and UV aging resistance

[0005] The high-density polyethylene-based carbon black masterbatch used in polyethylene pipes is difficult to disperse in the geomembrane, and it is easy to produce crystal points and blocks that affect the appearance and mechanical properties of the geomembrane. In addition, the anti-oxidant in the polyethylene pipe color masterbatch Low additive content, it is difficult to meet the requirements of geomembrane for thermal oxygen aging and ultraviolet aging

[0006] Generally, the high-density polyethylene resin for geomembrane is not suitable for use as the matrix material of carbon black masterbatch due to its low melt index and high resin viscosity, while the general-purpose high-density polyethylene resin has no added comonomers, resulting in its environmental stress resistance. Very poor, after adding the carbon black masterbatch of this type of resin as the base material to the geomembrane, the environmental stress cracking resistance of the geomembrane product will be reduced or even unqualified. The present invention finds through research that general-purpose high-density polyethylene and linear low-density The use of polyethylene in a certain proportion can greatly improve the environmental stress cracking resistance of the composite system. This discovery has not yet been reported in the literature.

Images