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Info EDUARD 04/2023, Page 41
Info EDUARD 04/2023, Page 42
CHEMISTRY
Text: Josef Blažek
Foto: autor
We will then focus on cyanoacrylate (CA)
glues, their accessories, epoxy adhesives and
dispersive type glues. We will discuss their
differences and their composition, how they work,
and their properties that make them suitable for
different situations. We’ll demonstrate specific
glue types, with products from Bolt due to their
wide range of products and popularity among
modellers. However, the characteristics we will
be discussing are applicable to products from
other manufacturers as well.
CYANOACRYLATE GLUES
These are also known as instant glue and often
shortened to CA, and as the name implies,
these are rapid curing systems that harden on
contact with the bonding surfaces. Practical
applications of these types of adhesives are far
and wide, to include such materials as plastics,
glass, metal, fabric, paper and wood. Bonded
materials can be dissimilar. They can easily
be obtained from hardware and hobby stores
and pretty much any place that caters to the
handyman. To begin, we’ll discuss the principle
on which these glues work. They are based on an
unstable compound, which in this case is ethyl
cyanoacrylate. The compound reacts with water
(or moisture in the air) to quickly harden. To get
a little more technical, the chemical reaction
with water leads to reactive sites at the end of
the molecular chains. These reactive sites then
connect to each other under the influence of the
ongoing reaction, which leads to the formation
of a dense network of interconnected molecules.
This process is actually visible to the naked
eye. If there is a sufficient quantity of the glue
applied, the gradual hardening can be observed
until the adhesives has hardened as a whole.
On the contrary, if we spread a small amount of
glue, the whole process of gradual solidification
is extremely dynamic, which is caused by the
rapid penetration of moisture from the air
(that is, water) into the glue. This penetration
of moisture into the glue fundamentally affects
the speed of setting, which, from a modeler’s
perspective, explains why open containers of
glue gradually set (moisture penetrates the glue
after initial opening and consequent initiation of
the reaction).
STORAGE AND SHELF LIFE
OF CA GLUES
There are a lot of myths in the modelling
community about how to store and how not
to store instant glues in order to extend their
life. Unopened adhesives have an extended
shelf life due to the protective gas filling,
but this does not mean that their shelf life is
infinite. In general, higher storage temperature,
higher exposure to UV radiation (light) and
higher humidity always have negative effects
on the overall life of cyanoacrylate adhesives.
To give a specific example illustrating the idea
of the dynamics of the shortening of the shelf
life, when storing instant glues at an ambient
temperature of about 30 degrees Celsius,
the shelf life will be shortened by some 60 to
Instant, Epoxy and Dispersion Adhesives
To continue our discussion on modelling chemistry and
tips for beginners (and maybe advanced modellers will
find out something new, too), we will look at more types
of adhesives that are commonly used in the hobby.
Vítěz mezinárodních IPMS soutěží v kate-
gorii Master a několikanásobný mistr ČR.
Autor článků v mezinárodních časopisech
s celosvětovým dosahem (Military Illustrated
Modeller, Cocardes International, ModellFan,
Modelář). Spoluautor modelářského startupu
Plastic Invasion.
JOSEF BLAŽEK
INFO Eduard42
April 2023
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