The Multifaceted Role of Calcium Carbonate in Plastic Modification
Calcium Carbonate (CaCO₃), a common inorganic compound found in nature (e.g., limestone, marble), plays a pivotal role in the plastics industry. Its chemical stability and reactivity make it a versatile additive. Let’s explore its applications, benefits, and limitations.
Key Functions in Plastics
Strength & Rigidity Enhancement
CaCO₃ improves mechanical properties like tensile strength, impact resistance, and stiffness. For example, in PBS/PLA/PHA films, it balances anisotropy and boosts tear resistance.
Thermal Stability
With a low thermal expansion coefficient (3.0×10⁻⁶/℃), CaCO₃ reduces dimensional changes during processing. It also elevates the decomposition temperature of polymers like PVC, enhancing heat resistance.
The Effects of Different Particle Sizes of Calcium Carbonate on the Mechanical Properties of PBAT
Surface Performance
Adding CaCO₃ increases surface roughness and tension, improving adhesion for printing and coating on non-polar plastics like PE/PP.
The Melting Curves of Calcium Carbonate/PBAT Composites with Varying Concentrations
Porous Structure Creation
As a porogen, CaCO₃ generates microvoids (0.01–10μm) in films, enabling breathable yet waterproof materials.
Environmental Benefits
Smoke Suppressant: Neutralizes toxic halogens during combustion, reducing smoke.
Degradation Promotion: Enhances microbial access to buried plastics, accelerating decomposition.
(Source: Qingdao Dejian Technology & Technical Services Co., Ltd.)
Foaming Optimization
CaCO₃ acts as a nucleating agent, producing uniform microbubbles in foams. Ideal particle size: <5μm (to avoid agglomeration).
Limitations
Reduced Flexibility: May decrease ductility and impact strength.
Transparency Issues: Not suitable for high-clarity products.
Compatibility Challenges: Requires proper surface treatment for optimal dispersion.
Note: This content is for informational purposes. Source material may vary. Consult experts for specific applications.
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