MMA Adhesive for Wind Turbine Blade Bonding
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Solution Overview
Problem
Conventional adhesives for wind turbine applications, such as epoxy-based adhesives, suffer from high internal stresses, bubble formation, lengthy curing times, and poor adhesive bonds in thicker applications, leading to temperature-induced failures and increased maintenance needs due to unbalanced physical property profiles over wide temperature ranges.
Innovation Solution
A two-part MMA-based adhesive formulation comprising methylmethacrylate monomer, antioxidant, cure inhibitor, polyfunctional monomer, activator, cure accelerator, toughening agent, and impact modifier, optimized for wind turbine blade bonding with improved thermal stability and reduced shrinkage, offering enhanced lap shear strength and resistance to cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy-based adhesives are used for wind turbine bonding, then strong adhesive bonds are achieved, but high internal stresses and cracking occur leading to temperature-induced failures
Solution Approach 1:
The patent changes the chemical composition parameters by formulating a polyurethane resin system with specific isocyanate index (105-115) and combining multiple polyols with different properties (polyester polyol, polycarbonate polyol, polyether polyol) to achieve balanced physical properties across wide temperature ranges, eliminating the temperature-induced failures seen in epoxy systems
Solution Approach 2:
The patent creates a composite adhesive formulation combining polyurethane resin with specific ratios of different polyols (polyester polyol 30-70 wt%, polycarbonate polyol 10-40 wt%, polyether polyol 5-20 wt%) to achieve both strong bonding and thermal stability, effectively creating a material that combines the advantages of different polymer systems while avoiding their individual weaknesses
2Strength
If conventional adhesives are used in wind turbine applications, then bonding is achieved, but lengthy post curing at high temperature is required
Solution Approach 1:
The patent modifies the curing parameters by using a polyurethane system with isocyanate index 105-115 that cures at ambient temperature without requiring high temperature post-curing, reducing curing time from days to hours while maintaining bond strength
Solution Approach 2:
The adhesive formulation is designed to achieve initial set and handling strength within hours of application, allowing preliminary assembly and positioning before full cure, effectively performing the bonding function in stages without requiring lengthy continuous curing
3Strength
If epoxy adhesives are used for structural bonding, then strong bonds are formed, but bubble formation occurs due to air entrapment
Solution Approach 1:
The patent changes the viscosity and surface tension parameters of the adhesive by selecting specific polyol combinations and ratios, creating a formulation that is less prone to air entrapment during application while maintaining bond strength, thereby reducing bubble formation
4Length of stationary object
If epoxy-based adhesives are used in thick applications, then structural bonding is achieved, but poor adhesive bonds occur in thicker sections
Solution Approach 1:
The patent modifies the rheological parameters (viscosity, gel time) of the adhesive by adjusting polyol ratios and molecular weights, enabling the adhesive to flow and wet substrates effectively in thick bond lines while maintaining cure completeness and bond strength throughout the thickness
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 MMA-based adhesive formulation provides stable physical properties over a wide temperature range, improved thermal shock resistance, and superior bonding performance, reducing the need for additional monitoring and maintenance, while promoting long-term durability and storage stability.
Implementation Method 1
a polyaddition product of a polyester polyol, a polycarbonate polyol, and a polyether polyol
Implementation Method 2
coefficient of thermal expansion between -50 and 50° C.
Data Source
AI summary
A two part adhesive formulation is provided that has an adhesive part including methylmethacrylate monomer, an antioxidant, a cure inhibitor, and a polyfunctional monomer amount of dimethacrylate monomer, trimethacrylate monomer, or a combination thereof. An activator part includes methylmethacrylate monomer, and a cure accelerator. A toughening agent and an impact modifier in at least one of the adhesive part or the activator part. The adhesive formulation is well suited for forming a wind turbine blade from two or more substrates.