Tinting Base for Facade Paints Preventing Snail Trails
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Solution Overview
Problem
Polymer-bound facade paints, especially those in dark or intense colors, tend to form glossy streaks known as 'snail trails' due to the leaching of surface-active substances, which affect the appearance and quality of the coating, and existing solutions have not completely resolved this issue without compromising storage stability or other properties.
Innovation Solution
The solution involves reducing the content of critical surface-active substances, eliminating phosphates, optimizing wetting agent composition with polyacrylate wetting agents, and using silicone oil to reduce water absorption and prevent leaching, thereby minimizing the formation of snail trails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the content of surface-active substances is reduced to minimize snail trail formation, then the appearance quality improves, but storage stability and other coating properties deteriorate
Solution Approach 1:
The patent changes the chemical parameters of surface-active substances by replacing conventional surfactants with specific polyacrylate-based wetting agents and phosphoric acid esters. This parameter change allows achieving low snail trail formation (improved appearance) while maintaining adequate storage stability (improved reliability) through the selected chemical composition ranges.
Solution Approach 2:
The patent employs a composite approach by combining multiple substances with complementary functions: polyacrylate wetting agents for surface activity, phosphoric acid esters for stability, and silicone oils for water repellency. This composite material system resolves the contradiction by distributing functions across multiple components, allowing reduced overall surfactant content while maintaining performance.
2Object-affected harmful factors
If phosphates are eliminated to reduce snail trails, then appearance quality improves, but wetting and dispersing performance may deteriorate
Solution Approach 1:
The patent extracts and eliminates phosphates from the formulation to prevent snail trail formation. The harmful phosphatic surfactants are completely removed while their beneficial wetting and dispersing functions are replaced by alternative substances (polyacrylate wetting agents and phosphoric acid esters), thus achieving phosphate elimination without performance loss.
Solution Approach 2:
The patent introduces polyacrylate wetting agents and phosphoric acid esters as intermediary substances that mediate between the requirement for wetting/dispersing performance and the need to eliminate phosphates. These intermediaries provide the necessary surface activity without the snail trail-forming properties of conventional phosphatic surfactants.
3Duration of action of stationary object
If water absorption is reduced to prevent leaching, then durability improves, but the coating may become less compatible with pigment pastes
Solution Approach 1:
The patent changes the water absorption parameter by incorporating silicone oils (0.1-2.0 wt.%) that reduce water uptake of the coating film. This parameter change improves durability by preventing leaching while the selected silicone oil types and concentrations are optimized to maintain compatibility with existing pigment pastes, thus avoiding adverse effects on adaptability.
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
This approach significantly reduces or eliminates snail trail formation and improves water resistance, allowing for the production of facade paints with enhanced durability and appearance, even when using existing pigment pastes.
Implementation Method 1
The water-dispersed or dispersible polymer is based on i) acrylic acid esters and vinyl aromatics, in particular styrene, or on ii) acrylic acid esters and vinyl esters of at least one sodium acid (tertiary saturated monocarboxylic acid), in particular versatate
Implementation Method 2
Polymer-bound coatings are often used on the surface of outdoor structures, such as buildings, where they are more exposed to weathering and other influences
Implementation Method 3
These streaks are caused by the leaching of water-soluble substances such as emulsifiers, wetting/dispersing agents, surfactants, and similar surface-active substances from the coating film
Data Source
AI summary
Tinting base for the production of facade paints, comprising at least one organic binder, at least one wetting and dispersing agent, essentially without the addition of pyrophosphates or polyphosphates, in particular tetrapotassium pyrophosphate or sodium polyphosphates; at least one silicone oil; optionally at least one filler and other additives, water to adjust the consistency.