Butene-1 Polymer in Bitumen Mixtures for Viscosity Control
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Solution Overview
Problem
Existing bitumen-polymer compositions for roofing applications face challenges with high viscosity, making it difficult to achieve a homogeneous dispersion and processing, especially when fillers are added, resulting in unsatisfactory mechanical properties and increased energy consumption.
Innovation Solution
Incorporating a butene-1 polymer in low amounts into the polymer composition, along with a heterophasic polyolefin composition, reduces the viscosity of the mixtures without compromising mechanical properties, allowing for easier processing and potentially higher polymer content, which includes specific weight percentages of propylene homopolymer, ethylene copolymers, and soluble fractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymer compositions are added to bitumen to improve mechanical properties, then flexibility and ductility are improved, but viscosity increases making processing difficult
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer blend by incorporating butene-1 polymer with specific MFR values (0.1-1000 g/10min) into the existing propylene-ethylene copolymer system. This parameter change in polymer composition reduces the overall viscosity of the modified bitumen while preserving the mechanical property enhancements provided by the polymer fractions.
2Strength
If higher amounts of polymer composition are added to improve mechanical properties, then flexibility and resistance are improved, but viscosity increases requiring higher energy consumption
Solution Approach 1:
By modifying the polymer composition parameters to include butene-1 polymer with controlled MFR values, the patent enables higher polymer content incorporation without proportionally increasing energy consumption. The specific parameter range of butene-1 polymer (1-30% by weight) optimizes the balance between mechanical property enhancement and processing energy requirements.
3Strength
If polymer compositions with high intrinsic viscosity are used to improve mechanical properties, then flexibility and resistance are improved, but homogeneous dispersion becomes difficult
Solution Approach 1:
The patent creates a composite polymer system combining propylene-ethylene copolymer fractions with butene-1 polymer fractions. This composite material approach leverages the complementary properties of each polymer type, where the butene-1 component facilitates homogeneous dispersion while the propylene-ethylene fractions provide the desired mechanical property enhancements.
Data Source
AI summary
A mixture comprising a bitumen (A), and a polymer composition (B) comprising the following components, all percent amounts being by weight: I) from 1 to 30% of a butene-1 polymer having a Melt Flow Rate (MFR), measured according to ASTM D 1238, at 190° C./2.16 kg, from 0.1 to 1000 g/10 min.; and II) from 70 to 99% of a heterophasic polyolefm composition comprising the following polymer fractions: a) 4-45% of a propylene homopolymer or copolymer; b) 0-20% of a of a copolymer fraction containing ethylene, insoluble in xylene at room temperature; c) 40-95% of a copolymer of ethylene with propylene and/or a CH2═CHR α-olefin, where R is a C2-C8 alkyl radical, containing ethylene in a quantity lower than 40% and being soluble in xylene at room temperature.