Jun. 01, 2021
As a common packaging container, plastic packaging bottles have a wide range of applications in veterinary drug packaging, daily necessities, food and other industries. There are various types of processing raw materials for plastic packaging bottles. In order to increase the plasticity and stability of plastics, various additives are added to the raw materials.
Commonly used additives for plastic bottles include the following categories:
1. Plasticizer: It can increase the flexibility, extensibility and plasticity of plastics, reduce the flow temperature and hardness of plastics, and is beneficial to the molding of plastic products. Commonly used are phthalic acid esters, sebacic acid esters, chlorinated paraffin and camphor.
2. Stabilizer: During processing, storage and use of plastic products, under the action of light, heat and oxygen, aging phenomena such as fading, embrittlement and cracking will occur. In order to delay and prevent the occurrence of aging, stabilizers are added. Those mainly used to prevent thermal aging are called heat stabilizers; those mainly used to prevent oxidative aging are called antioxidants; those mainly used to prevent light aging are called light stabilizers, and they are collectively called stabilizers. The most excellent plastic stabilizer today is methyl tin heat stabilizer (181 for short), which is very effective for calendering, extrusion, injection and blow molding of rigid polyethylene (PVC).
3. Antistatic agent: mainly to eliminate or reduce static electricity generated on the surface of plastic products. Most of the antistatic agents are electrolytes, and their compatibility with synthetic resins is limited, so that they can migrate to the plastic surface to absorb moisture and eliminate static electricity.
4. Coloring agent: plastic coloring is mainly inorganic and organic pigments, which require high color strength and brightness; good transparency or hiding, dispersibility, weather resistance, thermal stability, chemical stability, and electrical functions , Environmental protection performance, etc. The coloring power directly determines the amount of colorant. Generally speaking, it increases as the particle size of the colorant decreases. The coloring power of organic pigments is much higher than that of inorganic pigments. When color pigments and white pigments are used together, the coloring power can be significantly improved. Nowadays, organic pigments and ultrafine particles are widely used and developed.
The above are several additives commonly used in plastic packaging bottles. These additives can improve the performance of plastic products and better protect the safety and stability of the contents.