Polyethylene modified asphalt compositions

a technology of polyethylene and modified asphalt, which is applied in the direction of building components, building insulations, constructions, etc., can solve the problems of difficult installation, and inability to meet the requirements of construction

Inactive Publication Date: 2007-03-08
ZANCHETTA NATALINO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, asphalt undergoes stiffening at low temperatures, which makes it fragile in cold weather temperatures even to light impacts.
However, blends containing SBS as the only modifier also have disadvantages.
For example, they tend to be soft and thus difficult to install during warm weather.
They have poor resistance to ultraviolet light from the sun, and thus need to be protected with a coating or mineral granules on the upper surface.
Furthermore, SBS's unique molecular structure makes processing SBS polymer difficult, and consequently manufacturing an SBS-asphalt compound requires special mixing equipment.
Asphalt modified with only APP, however, does not have enough hardness, and is susceptible to deformati

Method used

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Examples

Experimental program
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Effect test

example i

[0028] Examples of preferred embodiments of the inventive formulation appear in Table III below. The LDPE used in these examples has a density of less than 0.93 g / cm3 and the HDPE used in these examples has a melt flow index of 7.

TABLE IIIWarmColdIngredientsUnitapplication blendapplication blendLow density polyethylene%5.06.0High density polyethylene%5.01.5Plastification Agent%02.5Filler%35.035.0Asphalt%55.055.0

The formulation is prepared by loading all the ingredients in an external mixer and mixing the resultant mixture at temperatures ranging from 180° C. and 210° C. for 4 hours to 6 hours. The resultant formulation should have a viscosity between 2,000 and 20,000 cP at 180° C., a softening point temperature greater than 120° C., and a needle penetration value of greater than 100 dmm at 60° C.

[0029] Various tests were conducted on the polyethylene modified asphaltic blends described in Table II using ASTM test methods and standards commonly used in the art to determine suitab...

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Abstract

A polymer modified bituminous composition for roofing applications that comprises polyethylene as the primary modifier.

Description

TECHNICAL FIELD OF THE INVENTION [0001] This invention relates to bituminous roofing. More particularly, the present invention relates to modified asphalt composition for use in roofing materials. BACKGROUND OF THE INVENTION [0002] It is well known to use asphalt compositions to manufacture waterproofing materials, such as roofing membranes, shingles or underlayments. The purpose of such materials is to offer protection against the elements. Because of its good weatherability and hydrophobic nature, asphalt has been used in waterproofing applications for several centuries. [0003] Roofing materials must possess key mechanical and chemical characteristics, such as pliability, resistance to cracking at low temperatures, high puncture resistance, good strength and elongation (to withstand stresses and potential building movements), resistance to flow at elevated temperatures, and thermal and dimensional stability, etc. Most importantly, a roofing material must have minimal susceptibilit...

Claims

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Application Information

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IPC IPC(8): C08L95/00
CPCC08L23/06C08L23/08C08L95/00C08L2205/02C08L2555/60C08L2555/86C08L2666/06C08L23/00C08L91/00C08L2205/025
Inventor ZANCHETTA, NATALINODRIGO, MICHELEMOHSEEN, SHAIK
Owner ZANCHETTA NATALINO
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