PU soft foam refers to flexible polyurethane with certain elasticity, commonly known as PU sponge/foam. This kind of foam plastic has good elasticity, generally has the properties of low density, good elastic recovery, sound absorption, heat preservation, etc.
PU soft foam is mainly used in various cushioning materials, such as cushions, handrails, mattresses in automotive and household industry. Soft foam is also used as filter material, sound insulation material, shock-proof material, decoration material, packaging material and heat insulation material.
PU foam pad is the largest consumption of PU soft foam. It’s an ideal material for making furniture cushions(like Sofa) and automotive seats.
The laminated composite material made of PU soft foam and various textile fabrics is one of the classic applications in clothing field. Because the clothing lining made of PU soft foam has good heat insulation and air permeability. For example, it can be used as shoulder pads for clothes, bras, linings for various shoes, linings for handbags, etc.
In addition, PU soft foam is suitable for making mattresses because of its good air permeability and rebound resilience. The mattresses are mostly made of PU soft foam sheets, springs and fabrics.
At the same time, thanks to it’s good sound and shock absorption performance, it can also be used as sound insulation material in equipment.
Therefore, the application of PU foam happens everywhere in our life, it’s an important material in chemical industry.
However, the yellowing problem of PU foam is always troubled manufacturers.
Main reasons for the yellowing of PU foam:
> During the production process, due to the PU foam need high temperature to foaming, which triggers the aging and yellowing, while the core burning phenomenon occurs in serious cases inside the PU foam.
> Exposure to nitrogen oxides, such as yellowing caused by NOx, especially hindered phenol and amine additives will accelerate the yellowing.
> When PU foam is exposed to UV light for long-term, photo-oxidation aging will occur.
Ø How to deal with these kinds of challenges?
OMNISTAB AN6133 is a new type of liquid antioxidant developed for PU soft foam.
As a new generation of eco-friendly phosphite antioxidant, AN6133 contains no free phenols such as phenol, nonyl phenol and bisphenol A. It has the advantages of low volatility, good heat resistance and hydrolysis resistance, and can effectively improve the thermal stability and anti NOx yellowing of PU foam.
The EU REACH of OMNISTAB AN6133 is registered currently.
Besides, we could offer you full set of weather resistance solutions PU foams, PU coating and TPU elastomer, such as OMNISTAB AN6132, AN6108, AN6109, AN1135, AN5057, UV1, UV571, UV1130, LS292, etc.
When these additives are used in combination, the synergistic effect will be obtained. By this way, the degradation of polyurethane products under UV light can be effectively prevent, so that long-term and reliable protection can be achieved!
