Aqueous Urethane Resin Composition for Long Pot Life and Peel Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous polyurethane resin-based adhesives have a short usable time (pot life) and insufficient peel strength and light resistance, making stable processing difficult.
Innovation Solution
An aqueous urethane resin composition containing a specific urethane resin with a urea bond concentration of 100 mmol/kg or less, using nonionic polyols like polyethylene glycol and aromatic polyisocyanates, along with an emulsifier, to enhance pot life and peel strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a two-part adhesive combining PUD main agent and isocyanate crosslinking agent is used, then peel strength is improved, but pot life becomes short
Solution Approach 1:
The patent merges the PUD main agent and isocyanate crosslinking agent into a single one-part aqueous urethane resin composition. The composition contains both the polyurethane resin and polyisocyanate compound pre-mixed in water, eliminating the need for separate mixing while maintaining crosslinking functionality. This resolves the contradiction by allowing the adhesive to achieve both long pot life (no premature crosslinking) and good peel strength (crosslinking occurs during curing).
Solution Approach 2:
The patent changes the chemical parameters of the urethane resin by controlling the urea bond concentration to 100 mmol/kg or less and using specific raw materials (polyol compound with nonionic polyol and aromatic polyisocyanate compound). This parameter control prevents premature crosslinking reactions while enabling effective crosslinking during the curing process, thus achieving both long pot life and excellent peel strength.
2Object-affected harmful factors
If conventional aqueous polyurethane resin is used, then environmental friendliness is improved, but light resistance becomes insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by specifying the use of aromatic polyisocyanate compounds and controlling the urea bond concentration to 100 mmol/kg or less. These parameter changes result in a resin structure that provides both environmental friendliness (aqueous base, no organic solvents) and excellent light resistance (aromatic structure with controlled crosslinking).
Solution Approach 2:
The patent creates a composite adhesive system combining polyurethane resin, polyisocyanate compound, and water in specific proportions. This composite formulation achieves synergistic effects where the aromatic polyisocyanate provides light resistance, the aqueous base provides environmental friendliness, and the controlled crosslinking provides both long pot life and excellent peel strength.
3Object-affected harmful factors
If conventional aqueous polyurethane resin is used, then environmental friendliness is improved, but peel strength becomes insufficient
Solution Approach 1:
The patent changes the chemical parameters by incorporating polyisocyanate compounds and controlling the urea bond concentration to 100 mmol/kg or less. This enables effective crosslinking reactions that significantly enhance peel strength while maintaining the aqueous environmentally friendly formulation.
Solution Approach 2:
The patent formulates a composite aqueous system combining polyurethane resin with polyisocyanate crosslinking agents. This composite material achieves both environmental friendliness (water-based) and excellent peel strength (crosslinked network structure) simultaneously, resolving the contradiction between green chemistry and mechanical performance.
Data Source
AI summary
The present invention provides an aqueous urethane resin composition containing a urethane resin (A), an aqueous medium (B), and an emulsifier (C), in which the urethane resin (A) contains, as essential raw materials, a polyol compound (a1) containing a nonionic polyol, and an aromatic polyisocyanate compound (a2), and a urea bond concentration in the urethane resin (A) is 100 mmol/kg or less, a synthetic leather including an adhesive layer formed of the aqueous urethane resin composition, and a method for producing the aqueous urethane resin composition. The aqueous urethane resin composition has a long pot life and excellent peel strength and light resistance.