Bitumen-Free Sealant Composition Using Hollow Microspheres
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Solution Overview
Problem
Existing bitumen-based sealing compounds pose health risks due to potential carcinogenicity and are costly, complex to handle, and do not meet performance requirements, while bitumen-free alternatives are either expensive or have poor practicality and performance.
Innovation Solution
A bitumen-free building material composition combining polymer dispersion, polystyrene particles, ceramic hollow microspheres, and synthetic hollow microspheres, optionally with a binder, which provides excellent sealing properties and minimal shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bitumen-containing sealing compounds are used, then sealing performance is improved, but health risks and environmental harm increase due to carcinogenicity
Solution Approach 1:
The invention extracts and removes the harmful bitumen component from the sealing compound while retaining the essential sealing functionality through alternative polymer-based formulations. This directly addresses the carcinogenicity issue by eliminating the problematic substance while maintaining sealing performance.
Solution Approach 2:
The invention changes the chemical composition parameters by substituting bitumen with polymer dispersions and other compatible materials. This parameter change transforms the sealing compound from bitumen-based to polymer-based, thereby eliminating carcinogenicity while preserving sealing effectiveness.
2Object-affected harmful factors
If bitumen-free sealing compounds are used to eliminate carcinogenicity, then health safety is improved, but cost increases due to expensive raw materials
Solution Approach 1:
The invention uses composite material formulation combining polymer dispersion, redispersible powder, fillers, and other components to achieve bitumen-free sealing performance at reduced cost. The composite approach allows optimization of individual component costs while maintaining overall performance.
Solution Approach 2:
The invention employs cost-effective polymer dispersions and redispersible powders that can be manufactured and applied economically, replacing expensive specialized bitumen-free alternatives while achieving comparable performance and safety.
3Object-affected harmful factors
If cementitious systems are used for sealing, then environmental friendliness is improved, but processability in thick layers deteriorates making them unsuitable for vertical surfaces
Solution Approach 1:
The invention changes the rheological and compositional parameters by incorporating polymer dispersion and redispersible powder with improved flow characteristics. This allows the sealing compound to be processed in thick layers on vertical surfaces while maintaining environmental friendliness through bitumen-free formulation.
Solution Approach 2:
The invention creates a composite material system combining cementitious components with polymer additives, achieving both environmental friendliness and improved processability for thick-layer application on vertical surfaces.
4Object-affected harmful factors
If reactive sealing systems are used to eliminate bitumen, then carcinogenicity is reduced, but handling complexity increases
Solution Approach 1:
The invention segments the sealing compound into separate components (polymer dispersion and redispersible powder) that can be stored separately and mixed before application. This segmentation simplifies handling by allowing components to be stored in stable forms and combined only when needed, reducing complexity compared to pre-mixed reactive systems.
Solution Approach 2:
The invention uses water or other compatible liquids as an intermediary to disperse and mix the polymer components, simplifying the handling process compared to direct reaction between reactive chemicals. The intermediary allows easy mixing and application while maintaining the bitumen-free, low-carcinogenicity advantage.
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 composition achieves excellent sealing performance comparable to bitumen-containing systems, is environmentally friendly, cost-effective, and prevents shrinkage cracks, making it suitable for various building applications including vertical surfaces.
Implementation Method 1
One-component thick bitumen coatings harden or form a film purely physically through the evaporation of water or solvents
Implementation Method 2
the building material composition according to the invention, although it is formulated based on relatively expensive polymer dispersions, was developed at the same price level as bitumen emulsions. It is also surprising that the seal hardens practically without shrinkage
Data Source
AI summary
The invention provides a building material composition which is particularly suitable for use as a bitumen-free sealant for construction sealing and comprises a polymer dispersion or a corresponding redispersion powder, based in particular on preferably aqueously redispersible emulsion polymers, together with polystyrene particles, ceramic and synthetic hollow microspheres, and also, if desired, at least one binder and, if desired, further additives. The sealant of the invention can be formulated in principle as a 1-component or 2-component application system. The bitumen-free building material composition of the invention not only has excellent sealing properties, such as can conventionally be achieved only with bituminous sealants, but also, in particular, an excellent contraction behaviour after application.