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Photocatalytic film
(Titanium dioxide photocatalytic membrane material)

Architetcure for a Sustainable Society

Our architectural membrane materials have been confirmed by testing to be stain resistant. White is a color that can maximize the advantages of membrane materials that provide bright and cool spaces because of its high light transmittance and high solar reflectance. White (white) used to be shunned because of its conspicuous dirtiness, but thanks to antifouling technology using titanium dioxide photocatalyst, we can achieve "membrane" architecture that is friendly to people and the environment.

Features of Photocatalytic Films

Membranes keep themselves white.

Titanium dioxide photocatalyst absorbs sunlight (ultraviolet rays) to oxidize and decompose organic matter, so when sunlight hits the titanium dioxide photocatalyst film material, it decomposes organic dirt. In addition, titanium dioxide photocatalyst has a hydrophilic function, and water droplets spread horizontally to form a water film.
Thus, rainwater penetrates between the surface of the membrane material and the dirt, lifts the dirt, and the rain washes the dirt away.

fluoropolymer

1. light decomposition of dirt

2. rain pushes dirt away

vinyl chloride resin

1. light decomposition of dirt

2. rain pushes dirt away

Results of outdoor experiment after 5 months

General membrane materials

Fluorinated membrane material

Photocatalytic membrane material

Photocatalytic membranes clean the surrounding air (NOx removal)

Fluoropolymer-based photocatalytic membrane material is a photocatalytic membrane material with enhanced air purification performance that decomposes and removes NOx, in addition to its existing antifouling performance. The double effect cleans both the building and the air.

Mechanism of NOx decomposition and removal by photocatalytic membranes

When sunlight hits the membrane surface, a photocatalytic reaction occurs. When NOx gas comes into contact with it, the photocatalyst breaks down the NOx and converts it into harmless ions. The ions dissolve in rainwater and are washed away and removed. In this way, photocatalytic membranes decompose and remove NOx adhering to the membrane surface, thus purifying the air at the surface.

trade (brand) name Air Purify 450 AP450
Type of photocatalyst, etc. titanium oxide
Photocatalyst processing area or product form Membrane surface
Effects of photocatalysts, etc. Self-cleaning effect: UV The measurement method was in accordance with JIS R1703-2.
Degradation activity index*1 26.3nmol／L／min This is a rough estimate of the performance of the product in breaking down dirt.
Air purification effect: UV (nitrogen oxides) The measurement method was in accordance with JIS R1701-1.
Nitrogen oxide removal*2 1.56μmol The effect is to reduce nitrogen oxides in the atmosphere.
Establishment of standard validity period of performance
Available Locations outdoors
safety We have confirmed that the safety standards of the Photocatalyst Industry Association are satisfied for acute oral toxicity test, primary skin irritation test, and mutagenicity test.
Precautions for use Excessive dirt on the surface will not be fully effective, so regular cleaning is recommended.
The amount of removal in a real environment depends on the area of construction and the intensity of UV light.

1 The certification standard of the Photocatalyst Industry Association is a decomposition activity index of 5 or higher, with the higher index indicating higher performance.

*2 The certification standard of the Photocatalyst Industry Association is a NOx removal rate of 0.50 μmol or higher. This value is expected to be effective in removing 10% of NOx generated from automobiles.
This value is the amount of nitrogen oxide that can be removed when irradiated with ultraviolet light for 5 hours per 50 square meters of area, and the larger this value, the greater the removal effect.