During the plasticization process, calcium zinc stabilizers have a high electronegativity, and the acute nodes of PVC resin have a certain affinity, forming strong bond energy complexes.
Calcium zinc stabilizers can be divided into solid calcium zinc stabilizers and liquid calcium zinc stabilizers
Liquid calcium zinc stabilizer is compatible with resins and plasticizers, with good transparency, low precipitation, low dosage, and easy use. The main disadvantages are poor lubricity and deterioration during long-term storage.
Solid calcium zinc stabilizers are mainly composed of stearic acid soap. The product is characterized by good lubricity and is suitable for processing hard PVC pipes and profiles
Products processed using microemulsification technology overcome the aforementioned drawbacks. Focus on improving from two aspects: changing the initial coloring, using sufficient amount of zinc soap, and using a composite agent to render zinc chloride harmless, which becomes a high zinc complex; Reducing the amount of zinc soap to prevent the combustion of zinc and changing the initial coloring with additives is known as low zinc blending. It is not only widely used in soft products, but also in the processing of hard products.
Calcium zinc stabilizers, due to their high electronegativity, have a certain affinity for the acute nodes of PVC resin during the plasticization process, forming strong bond energy complexes that weaken or solve the attraction of ion bonds in various layers of PVC. This makes the interlocking segments of PVC easy to diffuse, and the molecular groups are prone to small boundaries, which is beneficial for the plasticization of PVC resin. Causing a sharp increase in melt pressure, melting
The body viscosity decreases, the temperature increases, and the plasticizing temperature decreases.
In addition, as traditional PVC processing equipment is designed for processing using lead salt stabilizers, even with sufficient lubricant added, it cannot prevent the resin from further plasticizing in sufficient time, disrupting the original lubrication balance. In the later stage of use, PVC melt consumes a large amount of heat stabilizer in the homogenization stage, but at the same time cannot achieve the ideal viscosity and elasticity to meet the production needs of hard PVC.
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To overcome this challenge, stabilizers are added to PVC formulations. In this article, we will delve into the benefits of Calcium Zinc Stabilizers for PVC, exploring their product grades, applications, and key features.
Understanding Calcium Zinc Stabilizers:
Calcium zinc stabilizers are a type of stabilizer commonly used in PVC formulations. They are composed of a blend of calcium, zinc, and organic acids. Unlike traditional stabilizers like Lead-based or Tin-based stabilizers, calcium zinc stabilizers offer improved safety and environmental advantages. They are free from heavy metals and hazardous substances, making them a sustainable choice for PVC production.
Product Grades of Calcium Zinc Stabilizers:
Various product grades of calcium zinc stabilizers for PVC are available, each with specific performance characteristics for different PVC formulations.
1. General-Purpose Grades: Balanced combination of heat stability, weatherability, and processing performance.
2. High-Heat Stability Grades: Excellent heat stability during PVC processing at elevated temperatures.
3. Weatherability Grades: Enhance the resistance of PVC products to outdoor weathering, UV radiation, and environmental factors.
4. Transparent Grades: Maintain the clarity and transparency of PVC while providing necessary stabilization.
5. Low-Volatile organic Compound (VOC) Grades: Minimizing the emission of volatile organic compounds during PVC processing or in the final product.
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6. Food-Contact Grades: Complies with regulatory requirements for PVC products intended for food-contact applications.
Factors such as heat stability, weatherability, and mechanical properties influence the selection process. It is important to consider the specific requirements of the PVC application and consult with experts to determine the optimal grade.
Applications of PVC with Calcium Zinc Stabilizers:
The applications of PVC with calcium zinc stabilizers are widespread across several industries.
- Construction industry: PVC pipes and fittings, as well as window profiles and frames, benefit from the heat stability and long-term durability provided by calcium zinc stabilizers.
- Electrical industry: PVC cable insulation and electrical connectors rely on the improved weatherability and resistance to degradation offered by these stabilizers.
- Automotive industry: Utilizes PVC with calcium zinc stabilizers in interior trims, panels, seals, and gaskets, enhancing their mechanical properties and longevity.
Furthermore, calcium zinc stabilizers find applications in other industries and niche applications, showcasing their versatility and wide-ranging benefits.
PVC Stabilizer > Non-Toxic Ca Zn Stabilizer
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