Do you know what kinds of PVC stabilizers are available?

Stabilizers used to stabilize hard and soft PVC films are generally used at a dosage of 0.5% to 3% of the amount of PVC. Due to the small amount, if used properly, the stabilizer has little effect on the performance of the film (mainly physical properties). However, the stabilizer will affect the light stability, and sometimes affect the color, Liu water performance, transparency of transparent film and rigid film softening point. It is also worth noting whether there are physiological effects on rigid packaging films.

Although the amount of stabilizers is small, they are extremely important and one of the most expensive components of the formulation for film production. The key to ensuring that all the additives in PVC can meet the required requirements and produce good quality (firstly, normal color) film lies in the choice of stabilizers and their correct proportioning and dosage. The following introduces the stabilizers commonly used in the production of PVC film, according to the role can be divided into stabilizers, ultraviolet absorbers, antioxidants and so on.

1、Stabilizer

(1) Lead compounds Lead compounds include sulfuric acid, carbonic acid, phosphoric acid, phthalic acid, stearic acid and other lead salts. Lead stabilizer is the earliest variety used to stabilize PVC, and its heat stabilization effect is very good, and a part of the lead salt also has a very good light stabilization effect. Clear and transparent films cannot be produced with these stabilizers, and in the presence of hydrogen sulfide, the films appear dark brown. For these reasons, they cannot be used in all films.

(2) barium soap and cadmium soap barium and cadmium (also includes calcium) organic acid soap (such as stearic acid soap, lauric acid soap), often alone or mixed with other stabilizers, as a polyvinyl chloride film (especially soft polyvinyl chloride film) heat, light stabilizer. Application of barium soap and cadmium soap can solve many manufacturing and application technology problems.

If properly proportioned, in addition to the heat stabilization effect, it will produce satisfactory light stabilization.

Chelating agent can be generated with the resulting metal chlorides to generate complexes, and thus so that it does not produce harmful effects. Currently, the commonly used chelating agents are diphenyl diisooctyl phosphite and triphenyl phosphite. Currently is expanding the application of liquid barium a cadmium, in the liquid barium a cadmium to add a large number of redundant agent benzene diisooctyl phosphite and a small amount of bisphenol A and pentaerythritol. This chelating agent and liquid stabilizer stabilizer system, commonly used in flexible films and achieved good results.

Barium and cadmium compounds are not known to be non-toxic. Calcium and zinc compounds can be used to achieve physiologically neutral stabilization.