Introduction
Polyvinyl chloride (PVC) is one of the widely used plastics. The selection of heat stabilizer during its processing is crucial to prevent thermal degradation and oxidation and maintain the performance of the material. Dibutyltin monooctyl maleate (DBMS) is a kind of organotin heat stabilizer. Compared with other types of heat stabilizers, it has unique performance and application range. This article will discuss the differences between DBMS and calcium zinc, lead salt, barium zinc and composite heat stabilizers, as well as their respective characteristics and applicable scenarios.
Organotin heat stabilizer: dibutyltin monooctyl maleate (DBMS)
DBMS is known for its excellent thermal stability and transparency. It is especially suitable for PVC products with high requirements on transparency and color stability, such as films, hoses, cables, etc. Its advantages are:
- High thermal stability: Effectively inhibits the formation of HCl and prevents further degradation of PVC chains.
- Good transparency: Maintain the original color of PVC products, suitable for transparent or light-colored products.
- No sulfide pollution: No sulfide will be introduced during processing, maintaining the purity of the product.
- Lubricity: Provides slight internal lubrication effect to improve PVC melt fluidity.
Calcium zinc heat stabilizer
Calcium zinc heat stabilizers are a non-toxic, environmentally friendly alternative suitable for food contact and medical applications. Their main advantages include:
- Environmentally friendly: Contains no heavy metals and complies with RoHS and REACH regulations.
- Biocompatibility: Suitable for medical and food packaging fields.
- Antistatic: Certain formulations provide antistatic properties.
- Cost-effectiveness: Lower cost compared to organotin.
However, the thermal stability and transparency of calcium-zinc heat stabilizers are generally not as good as those of organotin, especially under high-temperature processing conditions.
Lead salt heat stabilizer
Lead salt was once a commonly used heat stabilizer in the PVC industry, with excellent thermal stability and cost-effectiveness. But the main disadvantages of lead salt are:
- Environmental and Health Risks: Contains lead, which is harmful to the environment and human health.
- Sulfide pollution: It is easy to cause sulfide pollution, which limits its application in transparent products.
- Color Stability: May cause discoloration of the product.
Barium zinc heat stabilizer
Barium-zinc heat stabilizer combines the environmental protection properties of calcium and zinc with high thermal stability, and is an intermediate option between lead salts and organotin. Their advantages include:
- Environmentally friendly: Lead-free, reducing environmental and health risks.
- Better thermal stability: Better than calcium zinc, but slightly lower than organotin.
- Cost: Between calcium zinc and organotin.
Composite heat stabilizer
Composite heat stabilizers combine the advantages of different types of heat stabilizers, usually containing organotin, calcium zinc or barium zinc, as well as auxiliary stabilizers such as epoxy compounds and antioxidants. Their design goals are:
- Comprehensive performance: Provides higher thermal stability, processing performance and color stability.
- Flexibility: Adapt formulations to different applications to meet specific needs.
- Environmental adaptability: Ingredients can be adjusted according to environmental regulations to meet various market requirements.
Comparison summary
- Performance comparison: Organotins such as DBMS are leading in terms of thermal stability and transparency, but the cost is higher and environmental health issues are worthy of concern.
- Environmental protection comparison: Calcium zinc and barium zinc heat stabilizers are better in terms of environmental protection, but thermal stability and cost-effectiveness need to be weighed.
- Application comparison: DBMS is suitable for applications with high performance requirements, while calcium zinc and barium zinc are more suitable for applications with high sensitivity to cost and environmental protection.
Conclusion
The selection of dibutyltin monooctyl maleate (DBMS) and other thermal stabilizers should be based on the requirements of the specific application, including but not limited to thermal Stability, transparency, cost, environmental protection and processing performance. As the industry attaches great importance to sustainable development, the research and development of heat stabilizers will focus more on improving performance while reducing environmental impact. In the future, more new stabilizers with high performance and low environmental impact may emerge.
The above comparison is based on existing technology and industry knowledge. With the advancement of new materials and technology in the future, the performance and market structure of heat stabilizers may change. Manufacturers and end users should continue to monitor industry trends to make the best product choices.
Extended reading:
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