PVC heat stabilizer on the impact of plastic weather resistance in daily life in outdoor long-term external use of PVC products will not only be caused by the effect of light aging, but also by wind, rain, snow and dew, the altercountry of day and night, seasonal changes, air pollution and so on. The aging phenomenon caused by the combination of these natural factors is usually called weather aging. The weather-resistant property is called the weatherability of PVC plastic. However, the impact on PVC weatherability is the PVC heat stabilizer used in processing. What is the weatherability of all kinds of PVC heat stabilizers? Through years of practice, Jinyuan Xiaobian organizes the following for you:
1. The weather resistance of lead salt stabilizers is general, among which the weather resistance of phosphite is better, followed by sulfite and sulfate is poor.
2. Among the metal soaps, cadmium soap has excellent weather resistance, followed by zinc soap, lead soap and barium soap, and calcium soap has poor weather resistance.
3, composite metal soaps, barium soap/cadmium soap, barium soap/cadmium soap/zinc soap good weather resistance, calcium soap/zinc soap is poor.
4. Among organotin stabilizers, maleate has better weather resistance, laurate is second, and sulfate is poor.
5, organic antimony stabilizer weather resistance is very poor, itself requires storage in opaque containers.
6, rare earth stabilizer has anti-photoaging effect, its weather resistance is better than lead stabilizer, and organotin performance.
In order to improve the weather resistance of PVC products for different types of stabilizers through the use of a variety of stabilizers synergism, can greatly change the weather resistance of PVC products. In addition to adjusting the PVC heat stabilizer formula, other functional additives can also be added to change the weather resistance of PVC products. The addition of UV shielding agent and UV absorber can prevent the degradation caused by UV, and the combination with other heat stabilizers can greatly improve the weather resistance of the complex.
In the soft PVC transparent products, the combination of barium/cadmium/epoxy/phosphite has better weather resistance. In this combination, the phosphite has a special change in the weather resistance of the barium/cadmium system, while the epoxy mainly changes its thermal stability. In soft opaque products, phosphite or sulfite base lead salt has good weather resistance, if the addition of phosphite or cadmium soap in trihalite lead sulfate, can make its weather resistance increased to the same degree as dihalite phosphite lead. If the use of barium/cadmium/epoxy/phosphite stabilization system, and supplemented with ultraviolet shielding agent titanium dioxide, its weather resistance is better than diphosphonium lead.
In opaque products, the base lead salt has good weather resistance. Because lead stabilizer and titanium dioxide are easy to black under the action of light, it is better not to use this combination. Lead stabilizer aging will also appear bleaching phenomenon, and anatase titanium dioxide is more prominent when used.