Home / Knowledge / News / Textiles / Cool black for hot days?
Cool black for hot days?
10
Jul '08
Drivers who can't find a shady parking spot in the middle of summer know what to expect: the black instrument panel, seats and steering wheel grow unbearably hot in the scorching sun.

Dark surfaces of building roofs and facades also attract the heat, but light surfaces remain distinctly cooler. The reason for this difference: dark surfaces absorb the incident sunlight and convert it into heat, while light surfaces reflect most of the incoming energy.

Although these physical principles at first appear unalterable, innovative pigments from BASF nevertheless make it possible for surfaces to heat up much less in the sun despite their dark color: Paliogen Black, Lumogen Black and Sicopal Black.

In contrast to carbon black, the standard black pigments, they reflect most of the invisible near infrared (NIR) radiation which accounts for more than 50 percent of the total incident solar energy.

“Because they swallow up the visible light completely like any conventional black pigment, the optical impression of blackness is preserved,” explains Ruth Bauer, marketing expert for special effect pigments at BASF.

In this way Paliogen Black and Lumogen Black reflect up to 45 percent and Sicopal Black up to 30 percent of the total incident solar radiation energy. By comparison: for carbon black, this value known as “total solar reflectance (TSR)” is less than five percent.

“In practical trials, the lower NIR absorption compared to other black pigments results in a temperature decrease of up to 20 degrees Celsius on the surface,” says Ruth Bauer.

“This provides benefits not only for humans. The lower temperatures also mean that there is less strain on the material.”

But Paliogen Black, Lumogen Black and Sicopal Black offer heat-reducing benefits not only as pigments in purely black surfaces: paints, coatings and plastics in almost all other color shades also contain greater or lesser amounts of black pigments.

If the BASF black pigments are used instead of carbon black, these colors also heat up much less in the sun. However, they exert this effect in different ways: Paliogen Black and Lumogen Black from the class of organic pigments, initially allow the NIR radiation to pass almost unhindered. What happens to it then depends on whether the substrate reflects or absorbs radiation.

“This is why Paliogen Black L 0086 only exerts its effect in coatings with a reflective substrate or in combination with reflective pigments,” continues Bauer. “But then it has a higher TSR value. As an organic pigment, it has high coloring capability.”

The new Sicopal Black K 0095, on the other hand, reflects the NIR radiation on its own and thus functions independently of the substrate – although the effect can be further optimized by a reflective substrate. The inorganic pigment is particularly weather, temperature and chemical resistant.

Besides being used in automotivecomponents such as the leather seats of the new BMW Cabrio, roofs and building facades are the main applications for these special pigments.


Must ReadView All

Indian govt relaxes cabotage rule for cotton transport

Textiles | On 25th May 2018

Indian govt relaxes cabotage rule for cotton transport

The Government of India has relaxed cabotage rules for transportation ...

Courtesy: Teejay Lanka

Textiles | On 25th May 2018

Teejay Lanka doubles production capacity at Indian mill

Teejay Lanka, one of Sri Lanka’s largest textile manufacturers, has...

Courtesy: Messe Frankfurt/Yarn Expo Autumn edition

Textiles | On 25th May 2018

Yarn Expo Autumn 2018 scheduled earlier

Over 500 exhibitors are expected at the Yarn Expo Autumn 2018, being...

Interviews View All

Anvita Mehra
Confidential Couture

‘It is going to take some time for Indian buyers to get accustomed to...

Poojaa Kumar Deepak
Zeven

Zeven's performance sports apparel is designed for the Indian body type,...

Darshan Mehta
Infinium Polychem

We are spending double digit figures on R&D

Rajat Jaipuria

Activewear brand Soul Space promotes organic cotton farming and...

Erik Sy

Manila-based CustomThread is a start-up offering premium custom apparel...

Suresh P Bagrecha

Komal Texfab, founded in 1981, is into manufacturing of knitted fabrics,...

Kerem Durdag
Biovation II LLC

Kerem Durdag, CEO, Biovation II LLC, provides an insight into future...

Larry L Kinn
Suominen Corporation

Larry L Kinn, Senior Vice President - Operations Americas of Suominen...

Iago Castro Asensio
RCfil Distribuciones S.L.

Iago Castro Asensio, International Business Manager of RCfil...

Anisha Chaudhari
Threads & Shirts

Threads & Shirts is a freshly-tailored concept providing men/women a...

Yash P. Kotak
Bombay Hemp Company

One of the directors of Bombay Hemp Company, Yash P. Kotak, speaks to...

Karan Arora
Karan Arora

Bridal couture created with rich Indian heritage, exquisite craftsmanship...

Press Release

Press Release

Letter to Editor

Letter to Editor

RSS Feed

RSS Feed

Submit your press release on


editorial@fibre2fashion.com

Letter To Editor






(Max. 8000 char.)

Search Companies





SEARCH

Leave your Comments


May 2018

Subscribe today and get the latest update on Textiles, Fashion, Apparel and so on.

news category


Related Categories:

Advanced Search