Advantages and disadvantages of lead salt stabilizers

The advantages of lead salt stabilizers include:
1. Good thermal stability: With chelating ability, it can replace unstable chlorine atoms, high metal content, and strong ability to absorb HCl.
2. Excellent electrical insulation: Low cost.
3. Excellent light resistance: Some varieties have good lubricity. Such as lead dihydrogen phosphate, it has good stability, antioxidant and UV shielding effects, and can endow profiles with good light stability and outdoor thermal oxygen stability, as well as surface smoothness. Combining with TiO2 can reduce the amount of UV absorbers and antioxidants used, and Hechuan is the most widely used stable system in PVC profiles in China.
4. Good processability: Suitable for various processing techniques and has the function of white pigment.
The disadvantages of lead salt stabilizers include:
1. Large dust: During use, there is a large amount of dust and multiple measurements, which can easily lead to measurement errors and have a significant impact on the quality of profiles, causing pollution. Dust inhalation is toxic to the human body.
2. The probability of using navy blue color change increases.
3. Monomer lead salt will decompose with PVC resin in the profile to produce HCl and PbCl2: it will cause continuous precipitation of metal ions. When they migrate to the surface of the profile, in areas with heavy sulfur pollution, sulfurization pollution is prone to occur, leading to discoloration of the profile. Therefore, lead cadmium ion coating agents, chelating agents, etc. should be added to the lead salt formula. Their function is to form complexes with impurities such as chlorides generated by the profile, prevent the precipitation of poorly compatible metal chlorides, and prevent sulfurization pollution and discoloration.
4. Poor dispersibility: Lead salt stabilizers have poor dispersibility.
5. High toxicity: Lead salt stabilizers are highly toxic.
6. Initial coloring property: Lead salt stabilizers have initial coloring property, making it difficult to obtain transparent products and products with vivid colors.
7. Lack of lubricity: Lead salt stabilizers lack lubricity and are prone to sulfur pollution.
In summary, lead salt stabilizers have unique advantages in plastic processing, but there are also significant drawbacks that cannot be ignored. In practical applications, it is necessary to comprehensively consider these factors and take corresponding measures to overcome their shortcomings.