ALPATEC MG 2.1 Manual de usuario descargar pdf (Pagina 8)

UNITEX nr. 1 - 2014

(grant No. IWT 095024) and LEDcure (grant No. IWT

120626).

Contact information:

Frederik Goethals, Centexbel Gent, e-mail: frg@

centexbel.be

Centexbel, Technologiepark 7, 9052 Zwijnaarde,

Belgium

STFI, Annaberger-Strasse 240, D-09125 Chemnitz,

Germany

TNO, Schoemakerstraat 97, P0 6024, 2600JA Delft,

The Netherlands

References

1) http://www.fusionuv.com/uvlearningcenter.aspx?id=206

2) Brinker, C. J. & Scherer, G. W. (1990). Sol-gel science. San Diego: Academic

Press, INC.

Application of microcapsules into textiles, the

new trend for added value performance

Devan Chemicals nv - Isabel Cardoso & Raquel Vieira

Performance textiles are a new paradigm for the textile

industry and represent one of the fastest growing

sectors of the industry. Market growth is being fuelled

by the emergence of new bres, new fabrics and

innovative process technologies. The market is also

being boosted by changes in consumer lifestyles;

people are living longer and spending more time on

leisure activities. Microencapsulation technology opens

up new marketing opportunities for textiles and home

furnishings.

The move by the more developed countries into textiles

with new properties and added value has encouraged

the industry to use microencapsulation processes as a

means of imparting nishes and properties on textiles

which were not possible or cost-effective using other

technology.

But while customers are always looking for something

different, retailers will need to be enlightened on the

technical benets of these treatments and show how

the premium-priced end products can be marketed

effectively.

The microencapsulation technology

The new patented technology of Devan’s group

consists on the application of active microcapsules with

functional reactive groups on the shell surface, which

can react within the chemical groups of the bres, and

be applied by any conventional textile nishing process

such as padding, exhaustion or spraying. The chemical

bond of the microcapsules with the bres confers a

very high resistance to washing during the life time of

the article.

The major application is the microencapsulation of

active cores as fragrances, skin-care components,

insect repellents and phase change material (PCM).

1. Phase Change Materials microcapsules

Devan’s THERMIC™ technology is based on the

microencapsulation of PCMs (phase change materials).

These materials, as their name indicates, possesses

the ability to change their physical state (phase) from

“solid to liquid” and from “liquid to solid”, within a

certain temperature range, in response to ambient

temperature oscillations. These materials absorb heat

when the temperature goes up, storing this energy

temporarily, and release the energy as heat when the

temperature cools down.

Fig. 1: the THERMIC™ technology is based on the microencapsulation of PCMs

(phase change materials)

They can be seen as a “thermal battery”, analogous

to electric batteries which are charged, then store

and release that energy on demand. In the case of

THERMIC™, the thermal batteries charge when thermal

energy is available (e.g. through body heat) and release

this thermal energy when the temperature (e.g. the

external temperature) drops below a certain point.

PCM’s have to be contained within a closed environment

(microcapsule) as when they change phase, they pass

from solid to the liquid state. If the PCM were not

encapsulated the liquid PCM would ow away.

Depending upon the application of these materials, the

nature of the capsule may change. If the application

has to maintain the physical characteristics of the

substrate, as in the case of textiles, the container has

to be very small. For this reason, microcapsules are

mostly used for textile applications. As microcapsules

are so small, a thousand times smaller than an average

human hair, they can be applied to textile substrates.

The challenge of applying PCMs on textiles is to apply

as many microcapsules per square meter as possible,

without changing the other properties of the fabric

(hand, breathability, tear strength,…).

By using the Devan´s group reactive technology

system, the disadvantages that are caused by the use

of binders, will be avoided and the textile will maintain

its properties. Also, the chemical bond of the reactive

microcapsules with the bres will enable washing

during the life time of the article. Wash fastness tests

were done up to 50 washes (40º C) with an average

loss of microcapsules of approximately 10-20%.

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