Energy savings plus mechanical reinforcement and rheology control

Long Open Time Acrylic Structural Adhesive

Adhesives Formulation

Applicable Type

Reactive Adhesives , Acrylic Adhesives

Applicable Base Polymer

Acrylics & Acrylic Copolymers

Applicable Industrial Sectors

Buildings & constructions , Transportation (excl. Automotive)

Applicable Base Polymer Properties

Thermosetting acrylic adhesives are rubber-toughened systems that cure rapidly at room temperature to provide a crosslinked structural adhesive suitable for bonding metals, engineering plastics, and many other substrates with minimal surface preparation. A very interesting advantage of thermosetting acrylic adhesive is their tolerance of surface contamination. They provide good bond strength with unprepared metal substrates such as oily steel. However, for optimum results standard surface preparation techniques should be employed.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

25% Neoprene AD-20 in methyl methacrylate monomer

xxxx

1% napthaquinone in methyl methacrylate monomer

xxx

5% NaEDTA in water/IPA

xxx

Paraloid KM 753 (Dow Chemical)

xxxx

40% Hypalon 30 in MMA

xxx

30% paraffin wax in MMA

xxx

t-butyl hydroperoxide

xxx

Methyl methacrylate

xxx

Laural methacrylate

xxxx

Methoxy polyethylene glycol monomethacrylate

xxx

30% of 40:60 blend of maleic acid in Hypalon 30 in methyl methacrylate

xxx

2,6-Di(tertiary-butyl) p-cresol

xxx

25% Neoprene AD-20 in methyl methacrylate

xxxx

1% napthaquinone in methyl methacrylate monomer

xxx

Methyl methacrylate

xxxx

Paraloid BTA-753 (Dow Chemical)

xxxx

Doverphos S480 (Dover Chemical Company)

xxx

VANAX 808 HP (R.T. Vanderbilt)

xxx

30% paraffin wax in methyl methacrylate

xxx

(Source: R.T. Vanderbilt)

Typical Properties

Properties

High tensile shear and peel strength especially on hard-to-bond plastics

High chemical resistance, exceptions are polar solvents, such as acetone, and strongly acidic or alkaline solutions

Good impact strength due to rubber toughener

Long open time for bonding large areas

Processing

Resulting Properties

Advantages of the acrylic chemistry are the moisture and outdoor weather resistance. These adhesives exhibit durability in aggressive environments. Tests have also shown a 90% retention of the bond strength of steel joints after 100 hrs exposure to 95% relative humidity and 40°C. Thermosetting acrylic adhesives are moderately resistant to attack from many industrial chemicals. Exceptions are polar solvents, such as acetone, and strongly acidic or alkaline solutions. A maximum operating temperature of 120°C is often recommended for these adhesives. High temperature resistance can be extended to 175°C by the addition of epoxy resin. Low temperature performance can extend down to –40°C.

Tips and Tricks

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