In practice, it is a convenient and effective method to prevent the photooxidation of polymers due to their photooxidants. The selection of a light stabilizer should not only consider its light-stabilizing efficiency, but also fully consider the mutual promotion of additives such as good compatibility with the resin, low volatility, and anti-extraction. At present, the light stabilizers commonly used in China and on agricultural films mainly include ultraviolet absorbers and free radical scavengers.
Ultraviolet chemical structure, ultraviolet absorbers can be divided into salicylate, benzophenone, benzotriazole; free radical scavengers are mainly hindered amines. during development. We have selected highly efficient hindered amine light stabilizers from the perspective of chemical structure. They can be seen as derivatives of steric barriers, one of their mechanisms of action is the capture of free radicals. In this process, hindered amine acts as a stable nitroxide radical: in addition, it has the functions of decomposing hydroperoxides, quenching singlet oxygen and quenching chromophores.
The requirements of light stabilizers for film products should not only consider their protection efficiency, but also their migration in the polymer to avoid loss due to volatile migration and leaching. In the case of the same concentration of light stabilizer and the same basic resin, several hindered amine light stabilizers were screened out according to the Xenon lamp aging test. Considering the non-drip function in the practical application of the greenhouse film, this experiment adds the same variety and content of the non-drip agent. The aging experiments were divided into two groups. The photo stabilizer film thickness of group A is 0.2%, the light stabilizer content of group B is 0.22%, and the film thickness is 0.08mm.
Polyurethane Material Co., Ltd.
20 years of professional polyurethane accessories.
10 years of research and development of anti-aging and anti-yellowing formula
Low odor amine catalyst, low VOC emission expert.
We only use first-line well-known brands for production raw materials,
Products of internationally renowned companies, with long-lasting and stable quality!
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City Polyurethane Material Co., Ltd. was established in 2009, and is deeply involved in the segmented industry of polyurethane raw materials —Amine catalysts: R&D and compound production of various types of amine catalysts, suitable for end products such as sponge, molding, high resilience, self-skinning, PU toys and various rigid and semi-rigid foams.
Label:   Light stabilizer UV absorber
