Aqueous Coating Composition for Desert Facade Durability
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Solution Overview
Problem
Existing facade coatings lack sufficient durability and resistance to dirt and dust pick-up across varying climate conditions, particularly in desert regions, where they often fail to maintain color retention and mechanical strength.
Innovation Solution
An aqueous coating composition comprising a dispersion of copolymers, inorganic solid particles, and optionally alkoxy-substituted polysiloxane, with specific comonomers and binding agents, along with fillers and additives like pigments and thickeners, to enhance mechanical strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional facade coatings are used, then they provide basic protective and decorative functions, but they lack sufficient durability and resistance to dirt and dust pick-up in desert climates
Solution Approach 1:
The patent employs a composite binder system combining silicate emulsion (inorganic component) with acrylic copolymer dispersion (organic component). This hybrid composition integrates the weather resistance and durability of silicate with the flexibility and adhesion of acrylic, creating a coating that maintains reliability across varying climate conditions including desert environments.
Solution Approach 2:
The patent modifies the chemical composition parameters of the binder system by incorporating specific monomer ratios (ester of ethylenically unsaturated carboxylic acid: 40-70 wt%, vinyl aromatic monomer: 10-30 wt%, alkoxysilyl monomer: 5-20 wt%). These parameter adjustments optimize the coating's resistance to dirt and dust pick-up while maintaining adaptability to different climates.
2Object-affected harmful factors
If coating compositions are optimized for desert climates, then they achieve high dirt resistance, but they may compromise performance in moderate climates
Solution Approach 1:
The patent creates a universal coating composition that performs effectively in both desert and moderate climates. The binder system is designed to provide multiple functions: dirt and dust resistance through silicate content, flexibility through acrylic copolymer, and climate adaptability through the synergistic combination of inorganic and organic components that respond appropriately to varying environmental conditions.
3Strength
If mechanical strength is increased through binder optimization, then wet abrasion resistance improves, but water absorption may increase
Solution Approach 1:
The patent applies local quality by incorporating hydrophobic modifiers specifically targeted at the coating's interaction with water, while maintaining the overall binder structure optimized for mechanical strength. The silicate emulsion provides a dense, low-water-absorption matrix, while the acrylic copolymer contributes flexibility and adhesion, creating localized functional zones within the coating system.
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 coating composition provides excellent color durability, reduced dirt and dust pick-up, improved mechanical strength, and extended recoating cycles, while maintaining appearance under harsh desert conditions, leading to energy savings and reduced carbon footprint.
Implementation Method 1
the copolymers A) comprise as copolymerized units A1) at least one comonomer having a hydrolyzable silane as functional group wherein said functional group does not act as a chain extender during the copolymerization reaction
Implementation Method 2
comonomer having a hydrolyzable silane as functional group
Implementation Method 3
an aqueous dispersion binding agent comprising copolymers A) and dispersed inorganic solid particles B)
Implementation Method 4
an alkoxy-substituted polysiloxane C)
Data Source
AI summary
The present invention relates to an aqueous coating composition comprising or obtained by mixing a) an aqueous dispersion binding agent comprising copolymers A) and dispersed inorganic solid particles B), wherein the inorganic solid particles B) are selected from the group consisting of fumed silica, colloidal silica, non-delaminated sheet silicates, delaminated sheet silicates and mixtures thereof, wherein the copolymers A) comprise as copolymerized units A1) comonomers having a hydrolyzable silane as functional group wherein said functional group does not act as a chain extender during the copolymerization reaction, and as copolymerized units A2) ethylenically unsaturated comonomers different from comonomers A1); b) an organic binding agent different from binding agent a); c) dispersing agents; d) fillers; e) organic solvents. The invention also provides a coating obtained by application of the aqueous composition, and to the use of the coating composition for the preparation of a coating.