Deep interpretation of release agent

Release agent is a functional substance that lies between the mold and the finished product. Release agents have chemical resistance and are not dissolved when in contact with the chemical components of different resins, especially styrene and amines. Release agents also have heat resistance and stress resistance, and are not easily decomposed or worn; The release agent adheres to the mold without transferring to the processed parts, and does not hinder painting or other secondary processing operations. Due to the rapid development of injection molding, extrusion, rolling, compression molding, lamination and other processes, the amount of release agent used has also significantly increased. The specific working principle of release agent 

1. Polar chemical bonds interact with the surface of the mold to form a regenerable adsorption film;

2. The silicon oxygen bond in polydimethylsiloxane can be regarded as a weak dipole (Si+- O -). When the release agent spreads in a single orientation on the surface of the mold, the molecule adopts a unique extended chain configuration; 

3. The free surface is covered by alkyl groups in a densely packed manner, and the demolding ability increases with the density of alkyl groups; But when the alkyl group occupies a large steric hindrance, the stretching configuration is limited, and the demolding ability will decrease;  

4. The molecular weight and viscosity of the release agent are also related to its demolding ability. When the molecular weight is small, it has good spreading ability but poor heat resistance. 

Key points for selecting release agents: 

1. The demoulding performance is excellent, and the surface tension of spray release agent is between 17 and 23 N/m.  

2. Has heat resistance and does not undergo carbonization or decomposition when heated.  

3. Chemical properties are stable and do not undergo chemical reactions with molded products.  

4. Does not affect the secondary processing performance of plastics.  

5. Non corrosive molds, non polluting products, low odor and toxicity.  

6. Smooth and beautiful appearance. 

7. Easy to apply, high production efficiency;