Can Thin Polyolefin Products Resist UV Light With UV Absorbers?

There is an effective solution to prevent polymer photodegradation: use light stabilizers or UV absorbers. So like polypropylene or polyethylene woven products, such as container bag packaging, construction or agricultural tarpaulin, polypropylene non-woven fabrics or polypropylene yarn, agricultural or industrial polyolefin film products, etc., Can ultraviolet absorbers work in these materials?

How do UV and light stabilizers work?

UVAs slow down the degradation process by preferentially absorbing harmful UV radiation and dissipating it as thermal energy.

The absorption of ultraviolet light is governed by the Lambert-Beer law:

Absorbance = Molar absorption coefficient ・Concentration・ thickness of absorbing substance

or A = ε.c.l = logarithmic 1/T, where T (transmittance) = I/Io (Io is the initial light intensity)

For optimal absorption, and thus effectively delay photodegradation, a high concentration of absorbent and sufficient polymer thickness are required.

Therefore, UV absorbers are effective:

◆ When protecting polymers with thickness

◆ When protecting the contents of film packaging or bottles

◆ When protecting other additives that are more sensitive to ultraviolet rays (such as pigments and flame retardants)

◆ In plastic substrates with ultraviolet absorption functional groups, such as polystyrene, polyester, etc.

 They are not very effective at protecting very thin items such as films/fibers. This is determined by the requirements for the thickness of the article in the Lambert-Beale law of light absorption.

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