I. Reasons for the discoloration of Plastic Products
The reasons for the discoloration of plastic products are diverse and mainly include the following aspects:
Thermal degradation: During the processing of plastics, due to the effect of high temperatures, the molecular chains break, generating free radicals and causing color changes.
Photo-oxidation: Under the irradiation of ultraviolet rays, plastic molecules undergo oxidation reactions, generating colored substances.
Chemical corrosion: When plastics come into contact with certain chemical substances, a chemical reaction occurs, resulting in a change in color.
Additive migration: Some additives in plastics migrate to the surface during long-term use, affecting the color.
Impurity contamination: Impurities are mixed into the plastic raw materials or during the processing, resulting in uneven color or discoloration.
Ii. Mechanism of Action of Powder Calcium-Zinc Stabilizer
Powder calcium-zinc stabilizer is a composite stabilizer composed of calcium salts and zinc salts. Its mechanism of action mainly includes the following aspects:
Neutralizing acidic substances: During the processing and use of plastics, acidic substances are produced, which can accelerate the degradation and discoloration of plastics. The calcium and zinc salts in the powder calcium-zinc stabilizer can neutralize these acidic substances and inhibit degradation reactions.
Capturing free radicals: Under the influence of heat and light, plastics generate free radicals, which can trigger chain reactions and cause plastic discoloration. Powder calcium-zinc stabilizer can capture these free radicals, terminate the chain reaction and prevent discoloration.
Stabilizing molecular structure: Powder calcium-zinc stabilizers can form stable complexes with plastic molecules, enhancing the stability of the molecular structure and preventing discoloration caused by molecular chain breakage.
Anti-ultraviolet effect: Some components in the powder calcium-zinc stabilizer have the function of absorbing ultraviolet rays, which can reduce the damage of ultraviolet rays to plastics and prevent photo-oxidation discoloration.
Iii. Application Cases of Powder Calcium-Zinc Stabilizers
PVC products: PVC (polyvinyl chloride) is a widely used plastic material, but it is prone to thermal degradation and discoloration during processing and use. By adding powder calcium-zinc stabilizers, the thermal stability and anti-color change performance of PVC products can be significantly improved. For instance, in PVC pipes, profiles, films and other products, the application of powder calcium-zinc stabilizers can effectively prevent problems such as yellowing and blackening of the products during high-temperature processing and use.
PE products: During long-term use, PE (polyethylene) products are prone to photo-oxidation discoloration due to the influence of ultraviolet rays. By adding powder calcium-zinc stabilizer to PE products, their UV resistance can be enhanced and the service life of the products can be prolonged. For instance, in products such as PE agricultural films and packaging films, the application of powder calcium-zinc stabilizers can prevent problems like fading and yellowing of the products during outdoor use.
PP products: During high-temperature processing, PP (polypropylene) products are prone to thermal degradation and discoloration. By adding powder calcium-zinc stabilizers to PP products, their thermal stability and anti-discoloration performance can be enhanced. For instance, in PP injection molded parts, fibers and other products, the application of powder calcium-zinc stabilizers can prevent problems such as yellowing and blackening of the products during high-temperature processing.
Iv. Advantages of Powder Calcium-Zinc Stabilizers
Environmental friendliness: The powder calcium-zinc stabilizer does not contain heavy metals such as lead and cadmium, meeting environmental protection requirements and being harmless to human health and the environment.
High efficiency: Powder calcium-zinc stabilizer has a highly efficient stabilizing effect and can significantly enhance the anti-discoloration performance of plastic products.
Versatility: Powder calcium-zinc stabilizers not only have anti-discoloration effects but also can enhance the heat resistance, weather resistance and other properties of plastic products.
Economy: The price of powder calcium-zinc stabilizer is relatively low, and the usage cost is also low, making it have a high cost performance.
V. Conclusion
Powder calcium-zinc stabilizer, as an efficient and environmentally friendly stabilizer, has a remarkable effect in solving the discoloration problem of plastic products. Through mechanisms such as neutralizing acidic substances, capturing free radicals, stabilizing molecular structure, and resisting ultraviolet rays, powder calcium-zinc stabilizers can effectively prevent discoloration of plastic products during processing and use. In plastic products such as PVC, PE and PP, the application of powder calcium-zinc stabilizers can significantly enhance the thermal stability, UV resistance and anti-color change performance of the products, and extend their service life. Meanwhile, powder calcium-zinc stabilizers have advantages such as environmental friendliness, high efficiency, multi-functionality and economy, and are an ideal plastic stabilizer
