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UV-absorber for polymer |
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The area of the qualifier eCl@ss maintaining a kind of production UV-absorber for polymer on the B2B-Portal www.bridge2b.net
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Influence of UV absorber on photodegradation processes of poly(vinyl chloride) with different average degrees of polymerization. - Polymer Engineering and Science Article date. - Durability of PVC products is of special concern for their outdoor applications 7 The deleterious effects of solar ultraviolet UV radiation on PVC are well known. - 8 UV absorbers from the hydroxyphenylbenzotriazole and hydroxybenzophenone classes are typically added to PVC to protect PVC for long-term exposure to sunlight.
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Application of micronized titanium dioxide as inorganic UV-absorber 26-27th June 2001. - Trapping of free radicals formed during polymer degradation. - 5 % micronized titanium dioxide Polymer. - 5 % Benzophenone 1800H 80 film thickness 50 µm transmission % 60 Ideal UV Absorber 40 20 0 250 300 350 400 450 500 550 600 650 700 Wave length nm UV-B UV-A Klaus Schulte 11th Asia Pacific Coatings Conference. - 0% micronized titanium dioxide is recommended for initial tests at a film thickness of approximately 40-50 µm.
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Changes and loses its effectiveness, the stabilizer must be able to dispose its excitation energy in some harmless ways for PVC 6, 8 UV absorbers from the hydroxyphenylbenzotriazole and hydroxybenzophenone classes are typically added to PVC to protect PVC for long-term exposure to sunlight. - Any process in which monomers combine chemically to produce a polymer. - DP under a certain UV-irradiation conditions. - For the purpose of comparing samples with different concentrations of UV absorber and bar.
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In order to evaluate the UV-absorber characteristics of hydroxyphenyl triazine compound a, when mixed with a commercial thermoplastic material, thin low density polyethylene LDPE films are prepared, containing, as a typical formulation, 0 15% by weight of the above compound a and 0 70% of the sterically hindered amine ether 1g-2, used as light stabilizer of the polymeric system in highly demanding environments for agriculture applications.
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Polymers are considered to get weathered due to the direct or indirect impact of heat and ultraviolet light. - This reduces the absorption of UV ray by polymer matrix and hence reduces the rate of weathering. Typical UV-absorbers are oxanilides for polyamides, benzophenones for PVC, benzotriazoles and hydroxyphenyltriazines for polycarbonate. Strongly light-absorbing PPS is difficult to stabilize. Even antioxidants fail in this polymer since the polymer is electron-rich and behaves as antioxidant.
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