Chlorinated Polypropylene[2]
Overview
Chlorinated Polypropylene (CPP) is a derivative of polypropylene obtained through chlorination, which introduces chlorine atoms into the polymer chain. This modification enhances properties like adhesion, chemical resistance, and thermal stability, making CPP a versatile material for industrial applications. It is commonly available as a powder or granules, with varying degrees of chlorination (typically 20–40%) to suit different uses. CPP is widely adopted in coatings, adhesives, and inks due to its ability to bond with diverse substrates, including metals, plastics, and textiles. Its flame-retardant properties also make it suitable for safety-critical applications. The material’s compatibility with other polymers allows it to act as a modifier, improving performance in composite materials.
Physical and Chemical Properties
CPP exhibits a density of 1.1–1.2 g/cm³ and decomposes at 160–170°C, releasing hydrogen chloride (HCl) gas. It is soluble in organic solvents like toluene, xylene, and acetone but insoluble in water. The degree of chlorination directly affects its solubility, adhesion, and thermal stability, allowing customization for specific applications. Key chemical properties include resistance to acids, alkalis, and oils, alongside excellent UV stability. These traits make CPP ideal for outdoor coatings and automotive components. Its molecular weight varies depending on the base polypropylene and chlorination process, influencing viscosity and film-forming capabilities in end products.
Main Applications
The primary use of CPP is in coatings and adhesives, where its strong adhesion to polypropylene and other plastics is critical. For example, it is applied in automotive interior coatings, food packaging laminates, and synthetic leather production. In printing inks, CPP enhances pigment dispersion and substrate bonding, particularly for flexible packaging. Another significant application is as a plastic modifier, where CPP improves the impact resistance and flame retardancy of polyolefins. It is also used in cable insulation and corrosion-resistant paints. The textile industry employs CPP as a coating for synthetic fibers to improve dyeability and water repellency.
Safety and Storage
CPP requires careful handling due to its potential to release toxic HCl gas upon decomposition. Work areas should be well-ventilated, and personal protective equipment (PPE) such as gloves and respirators must be used when handling the powder form. Avoid exposure to high heat or open flames during storage or processing. Storage conditions should include a cool, dry environment, away from oxidizing agents and direct sunlight. Bulk quantities are typically packaged in moisture-proof bags or drums. Suppliers often provide Material Safety Data Sheets (MSDS) detailing emergency measures for accidental exposure or spills.
B2B Procurement Guide
When procuring CPP, specify the chlorination degree (e.g., 25%, 30%) and intended application to ensure compatibility. Reputable suppliers should provide technical data sheets certifying consistency in molecular weight and chlorine content. Bulk buyers may negotiate prices based on volume, with discounts for orders exceeding 1 ton. Quality verification methods include testing solubility, adhesion strength, and thermal stability. For coatings and inks, request samples to evaluate performance under real-world conditions. Consider suppliers with ISO certification or compliance with regional safety standards (e.g., REACH, RoHS) to avoid regulatory issues.
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