Acrylic Polymer Mixture for Water-Permeable Sports Tracks
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Solution Overview
Problem
Conventional two-component polyurethane binders used in synthetic sports track surfaces are toxic and environmentally unfriendly, while acrylic latex binders take too long to dry and do not meet mechanical property standards for water-permeable running tracks, especially in rainy areas.
Innovation Solution
A novel polymer mixture comprising two acrylic emulsion copolymers with different glass transition temperatures and a water-dispersible isocyanate crosslinking agent, combined with vulcanized or crosslinked rubber, which dries faster and meets the GB/T 14833-2011 standard for water-permeable running tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If acrylic latex binders are used to prepare running track surfaces, then environmental friendliness is improved, but drying time becomes too long and mechanical properties do not meet standards
Solution Approach 1:
The patent uses a composite binder system combining acrylic emulsion polymers with water-dispersible isocyanate crosslinking agents and vulcanized rubber particles. This composite approach allows the binder to maintain environmental friendliness (water-based, no toxic solvents) while achieving faster drying and improved mechanical properties through synergistic interactions between components. The crosslinking agent creates a three-dimensional network structure that accelerates drying and enhances strength.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the binder system by introducing crosslinking agents that react with hydroxyl groups on polymer chains. This changes the molecular structure from linear to crosslinked, fundamentally altering drying kinetics and mechanical properties. The crosslinking density and rubber particle size are optimized to achieve both fast drying and high strength.
2Quantity of substance
If acrylic latex binders are used for thick applications, then water-permeability is achieved, but drying time increases significantly and tensile strength decreases
Solution Approach 1:
The binder comprises acrylic emulsion polymers combined with water-dispersible isocyanate crosslinking agents and 10-50 wt% vulcanized rubber particles. This composite structure provides both thick-layer applicability and high tensile strength through the crosslinked network and rubber reinforcement, achieving ≥0.4 MPa tensile strength even at thicknesses ≥13 mm.
Solution Approach 2:
The patent creates a porous structure by incorporating 10-50 wt% vulcanized rubber particles with specific size distributions into the binder matrix. This porous composite structure allows water permeability while the crosslinked acrylic network maintains structural integrity and tensile strength in thick applications.
3Strength
If conventional two-component polyurethane binders are used, then mechanical properties and wear-resistance are improved, but toxicity and environmental harm increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing toxic organic solvents and heavy metal catalysts with water-based acrylic emulsion polymers and water-dispersible isocyanate crosslinking agents. This substitution maintains mechanical properties through crosslinking while eliminating toxic components, achieving ≥0.4 MPa tensile strength with environmental safety.
4Reliability
If acrylic latex binders are applied in thick layers for water-permeability, then water-resistance is improved, but drying time becomes unacceptably long
Solution Approach 1:
The binder is a composite of acrylic emulsion polymers, water-dispersible isocyanate crosslinking agents, and vulcanized rubber particles. The crosslinking agent reacts with hydroxyl groups to form a three-dimensional network that accelerates water evaporation and provides rapid surface drying, while the porous rubber structure maintains water permeability and resistance.
Solution Approach 2:
The patent utilizes phase transition mechanisms where water evaporates from the binder matrix during drying. The crosslinked network structure facilitates rapid water release while maintaining structural integrity, enabling thick layers to dry quickly without sacrificing water resistance or mechanical strength.
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 polymer mixture provides faster drying, improved tensile properties, and enhanced water resistance, meeting the mechanical requirements of the GB/T 14833-2011 standard, even after immersion in water for 3 days, and supports heavy loads without delamination.
Implementation Method 1
the crosslinking agent reacts with hydroxyl groups, if present, on polymer chains to form a three-dimensional crosslinked network
Implementation Method 2
vulcanized or crosslinked rubber, wherein the vulcanized or crosslinked rubber has a sieve particle size of from 0.1 to 6 mm
Implementation Method 3
a novel polymer mixture of at least two acrylic emulsion (co)polymers having different glass transition temperature, a crosslinking agent comprising a water-dispersible isocyanate composition, and vulcanized or crosslinked rubber
Data Source
Figure 1
AI summary
A novel polymer mixture having fast drying time, a multilayer article comprising at least two layers of the dried polymer mixture and having good mechanical properties, water resistance and weatherability, and a method of preparing the multilayer article.