Low Modulus Silylated Mastic Composition for Concrete
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Solution Overview
Problem
There is a need for new compositions of low modulus putty that offer a good balance between mechanical, elastic, and adhesion properties without the use of a primer, particularly for applications involving concrete substrates where high flexibility and resistance to weather conditions are required.
Innovation Solution
A composition comprising 0.68% to 1.00% by weight of silsesquioxane with phenyl and alkoxy groups, 3% to 80% by weight of silylated polymer with alkoxysilane groups, and at least 25% by weight of carbonate filler, which forms a crosslinked network providing excellent adhesion and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high modulus sealants are used to provide high tensile forces, then strength is improved, but deformation capacity deteriorates and high stress is caused on adhesive joints or substrates
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating silsesquioxane with specific phenyl and alkoxy group ratios, and controlling the silylated polymer content, to achieve a material with simultaneously high strength and high deformation capacity that conventional sealants cannot provide
2Stability of the object's composition
If low modulus sealants are used to achieve significant deformation and flexibility, then elongation capacity is improved, but tensile strength deteriorates
Solution Approach 1:
The patent creates a composite material system combining silsesquoxane, silylated polymer, and carbonate filler in specific proportions to achieve a synergistic effect where the material exhibits both low modulus for high elongation and sufficient tensile strength, overcoming the limitations of individual components
3Reliability
If good adhesion properties are required for concrete substrates, then reliability is improved, but device complexity increases due to primer requirements
Solution Approach 1:
The patent extracts and eliminates the primer component from the sealing system by incorporating adhesion-promoting functional groups directly into the silsesquoxane and silylated polymer molecules, allowing the sealant to achieve reliable adhesion to concrete substrates through its own composition rather than requiring a separate primer layer
4Reliability
If resistance to weather conditions is improved, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates weather-resistant functional groups (phenyl and alkoxy groups on silsesquoxane, alkoxysilane groups on polymer) and optimizes their ratios to provide inherent UV, ozone, and water resistance, eliminating the need for additional weather-protection layers or complex manufacturing processes
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 a modulus at 100% elongation of less than 0.40 MPa and an elastic recovery of greater than 70%, meeting the criteria for low modulus putty and ensuring strong adhesion to concrete substrates without the need for a primer.
Implementation Method 1
which forms a crosslinked network providing excellent adhesion and mechanical properties
Data Source
AI summary
The present invention concerns a composition comprising: - 0.68% to 1.00% by weight of a silsesquioxane (A) comprising at least one phenyl group and at least one alkoxy group; - at least one silylated polymer comprising at least one alkoxysilane group, preferably 3% to 80% of at least one silylated polymer comprising at least one alkoxysilane group; and at least 25% by weight of at least one carbonated filler, percentages by weight being expressed with respect to the total weight of said composition, as well as the use of same as a mastic, in particular as a mastic for construction.