Acrylic coatings and adhesives provide outstanding UV stability, temperature stability, and overall durability. However, these coatings and adhesives are only useful if they can achieve adhesion to the target surface. Generally, there are no substitutes for a clean, well-prepared surface to allow coatings and adhesives to adhere well to their substrates. However, choosing the proper resin can help extend the working life of acrylic coatings and adhesives by providing better adhesion to various material types.
Mitsubishi Chemical Group has long been the leader in manufacturing quality adhesive and coating resins for substrate materials such as plastics, metals, concrete, wood, and paper. Recently, they released new adhesive and coating resin options specifically targeted at improving adhesion to difficult metal substrates.
Aluminum, steel, copper, and zinc are common metal substrates frequently used in environments that require coatings for corrosion protection. Adhesives used to bond metals are also gaining popularity as stress on joints can be distributed across the bond line rather than concentrated at fastening sites. Bonding to metal can be tricky, and light sanding and a primer are usually necessary. Elvacite® 4349 and Elvacite® 4347 are acrylic copolymer resins with outstanding adhesion for direct-to-metal (DTM) coatings to untreated and unprimed metals. They also provide a high degree of outdoor durability, chemical resistance, and abrasion resistance needed for the most challenging applications and environments.
Elvacite® 4188 is a versatile acrylic resin designed specifically for coating applications on both metal and plastic substrates. It forms strong bonds to untreated metals, including stainless steel, and mill-finished aluminum. It also facilitates excellent adhesion to plastics such as PS, ABS, and PVC. It is highly resistant to UV degradation and environmental wear, making it ideal for applications that require outstanding durability and longevity. Moreover, Elvacite® 4188 offers excellent clarity and gloss, ensuring that coatings remain aesthetically pleasing even after extended exposure to harsh conditions.
Resin
|
Tg (°C)
|
Molecular Weight (g/mol)
|
Acid Number (g KOH / g Resin)
|
Substrates with Great Adhesion
|
|---|---|---|---|---|
48
|
60,000
|
3.4
|
Cold rolled steel, galvanized steel, aluminum, zinc, tin, copper, brass
|
|
50
|
140,000
|
7.5
|
Cold rolled steel, galvanized steel, aluminum, zinc, tin, copper, brass
|
|
61
|
55,000
|
10
|
Steel, pretreated aluminum chromate, mill-finish aluminum
|
Many substrates require extensive surface preparation and treatment for acceptable adhesion to occur. Elvacite® acrylic resins are ideal for coatings and adhesives to allow excellent adhesion to a variety of untreated metals that are typically hard to bond to. In addition, coatings and adhesives that use Elvacite® resins benefit from superior weathering resistance, abrasion resistance, gloss, and the ability to fine-tune the degree of flexibility required for each application. ChemPoint offers several resources below to assist you in developing coatings and adhesives with Elvacite® acrylic resins.
Do you need help choosing a grade? Click the link below to visit our Elvacite® acrylic resin selection guide and walk through resin selection step by step.
Are you looking for inspiration? Click the link below to visit our Elvacite® acrylic resin starting point formulation library.
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