Carpet Coating Binder Composition for Wet Strength Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Carpet coatings based on vinyl acetate-ethylene copolymers face challenges in maintaining mechanical strength after exposure to water, leading to premature breakage and cracking due to high porosity and capillary water absorption, which affects cohesion and adhesion.
Innovation Solution
Incorporating an aqueous dispersion of vinyl acetate-ethylene copolymer with polyethyleneimine as a binder in carpet coating compositions, optimizing the formulation and application parameters to enhance mechanical strength without the need for copolymerization or special stabilizer systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vinyl acetate-ethylene copolymer is used as binder in carpet coating compositions, then good mechanical properties in fully finished carpet are achieved, but mechanical strength deteriorates after storage in water due to high porosity and capillary water absorption
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating polyethyleneimine (PEI) at concentrations of 0.1-10% by weight based on dry binder content. This modifies the molecular structure and intermolecular forces within the coating, reducing capillary water absorption and preventing the collapse in mechanical properties that occurs with conventional vinyl acetate-ethylene copolymers when exposed to moisture.
Solution Approach 2:
The invention creates a composite binder system by combining vinyl acetate-ethylene copolymer with polyethyleneimine. This composite material leverages the good mechanical properties of the copolymer while the PEI component provides resistance to water absorption and maintains strength in wet conditions, effectively resolving the contradiction between dry mechanical strength and wet reliability.
2Productivity
If foam application of carpet coating composition is used, then application efficiency is improved, but porosity and pore size distribution increase leading to high capillary water absorption
Solution Approach 1:
The patent modifies the chemical parameters of the coating composition by adding polyethyleneimine, which changes the surface energy and capillary pressure characteristics of the dried coating. This reduces the driving force for capillary water absorption even when the porous structure remains, allowing foam application to maintain its productivity benefits while mitigating the harmful effect of water absorption.
3Reliability
If polyethyleneimine is added to carpet coating composition, then wet mechanical properties are improved, but formulation complexity increases
Solution Approach 1:
The patent introduces polyethyleneimine as a straightforward compositional parameter change with a specified concentration range (0.1-10% by weight). This single parameter modification provides significant improvement in wet mechanical properties without requiring complex processing equipment or multi-step formulation procedures, thus achieving high reliability with minimal increase in formulation complexity.
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 use of polyethyleneimine in carpet coating compositions significantly improves the wet mechanical properties, including separation strength and knob pull-out force, even after water exposure, by enhancing cohesion and adhesion without compromising dry performance.
Implementation Method 1
The use of polyethyleneimine in carpet coating compositions significantly improves the wet mechanical properties, including separation strength and knob pull-out force, even after water exposure, by enhancing cohesion and adhesion
Implementation Method 2
The use of polyethyleneimine in carpet coating compositions significantly improves the wet mechanical properties, including separation strength and knob pull-out force, even after water exposure, by enhancing cohesion and adhesion
Implementation Method 3
In the case of high porosity and a wide pore size distribution resulting from the foam application of the carpet coating composition, the capillary water absorption of the coating composition is also high
Data Source
AI summary
The object of the invention is the use of an aqueous dispersion of a vinylacetate-ethylene-copolymer and of at least one polyethylene imine as a binder in a carpet coating composition for the production of carpets.