Bitumen Elastomer Joint Compound for Horizontal Vertical Sealing
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Solution Overview
Problem
Existing joint and crack filling compounds face issues with adhesion and material incompatibility when transitioning from horizontal to vertical joints, particularly in areas exposed to aggressive media, leading to leakage and poor sealing.
Innovation Solution
A compound comprising bitumen, styrene-butadiene copolymers, powdered mineral fillers, fibrous adjusting agents, and a polymer prepared from olefin and α,β-unsaturated carboxylic acid, which provides improved adhesion and compatibility across different joint orientations, ensuring stability and resistance to aggressive media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different materials (bitumen for horizontal joints, polysulfide/polyurethane for vertical joints) are used to fill horizontal and vertical joints, then each material can be optimized for its specific application, but adhesion and material incompatibility occur at contact points leading to poor sealing
Solution Approach 1:
The patent develops a single joint compound formulation that can be used for both horizontal and vertical joints, eliminating the need for different materials. The compound achieves this universality by incorporating a balanced composition of bitumen (30-75 wt%), elastomers (2.5-22 wt%), powdered mineral fillers (12-35 wt%), fibrous adjusting agents (0.5-5 wt%), and polymers from olefin and α,β-unsaturated carboxylic acid (0.1-8 wt%), which together provide the necessary adhesion, flexibility, and compatibility for all joint orientations.
Solution Approach 2:
The patent creates a composite material combining multiple components with complementary properties. The bitumen provides base binding and water resistance, elastomers add flexibility and adhesion, mineral fillers provide structural stability, fibrous agents enhance tensile strength, and the olefin-based polymer improves compatibility and resistance to aggressive media. This composite structure enables the single compound to perform multiple functions that previously required separate materials.
2Ease of manufacture
If bitumen-based compounds are used for horizontal joints, then cost-effectiveness and aqueous resistance are achieved, but incompatibility and plasticizer migration occur when contacting vertical joint materials
Solution Approach 1:
The olefin-based polymer containing α,β-unsaturated carboxylic acid groups acts as a compatibilizer or intermediary between the bitumen matrix and other materials. This polymer component facilitates compatible interaction at contact points, preventing plasticizer migration and ensuring stable adhesion between horizontal and vertical joint materials while maintaining the cost-effectiveness of the bitumen-based formulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compound achieves stable adhesion and sealing in both horizontal and vertical joints, preventing leakage and maintaining effectiveness over time, even under exposure to aggressive substances, and can be easily processed and repaired.
Implementation Method 1
at least one polymer prepared from an olefin and an α,β-unsaturated carboxylic acid and/or an α,β-unsaturated carboxylic acid anhydride, in an amount ranging from about 0.1 wt% to about 8 wt% - preferably up to about 5% by weight
Implementation Method 2
at least one elastomer selected from a group comprising styrene-butadiene copolymers, styrene-butadiene-styrene (block) copolymers, styrene-isoprene-styrene (block) copolymers, styrene-isoprene (block) copolymers, synthetic and/or natural rubbers
Implementation Method 3
at least one bitumen in an amount ranging from about 30% to about 75% by weight
Data Source
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AI summary
To solve the problem of providing a composition for filling joints and/or cracks, preferably in horizontal and/or vertical areas which has advantageous relating to adhesion and the like, a suitable composition is proposed comprising a quantity in the range of about 30% by weight to about 75% by weight of at least one bitumen; a quantity in the range of about 2.5% by weight to about 22% by weight of at least one elastomer selected from a group comprising styrene-butadiene copolymers, styrene-butadiene-styrene (block) copolymers, styrene-isoprene (block) copolymers and/or styrene-isoprene-styrene (block) copolymers, synthetic and/or natural rubbers; a quantity in the range from about 12 % by weight to about 35 % by weight of at least one pulverulent mineral filler; a quantity in the range from about 0.5% by weight to about 5% by weight of at least one fibrous anti-flow additive to adjust strength, selected from the group comprising cellulose, glass fibres and/or synthetic fibres; and a quantity in the range from about 0.1% by weight to about 8% by weight, preferably to about 5% by weight, of at least one polymer produced from an olefin and from an α,ß-unsaturated carboxylic acid and/or α,ß-unsaturated carboxylic anhydride, where each of the percentages by weight is based on the entire quantity of the composition.