Brief Analysis on the Types, Functions and Uses of Rubber Release Agent
The release agent is a functional substance between the mold and the finished product. The release agent is chemically resistant and is not dissolved when contacted with the chemical composition of different resins, especially styrene and amines. The release agent also has heat and stress properties, is not easy to break down or wear; release agent bonded to the mold without being transferred to the workpiece to be processed, without prejudice to painting or other secondary processing operations. As the injection molding, extrusion, calendering, molding, laminating and other rapid development of the process, the amount of release agent is also greatly improved.
In theory, the release agent has a large tensile strength so that it is not easily polished when it is in constant contact with the molded resin. This is especially true when there are frosted mineral fillers or glass fiber reinforcements in the resin. The release agent is chemically resistant and is not dissolved when contacted with the chemical composition of different resins, especially styrene and amines. The release agent also has heat and stress properties, is not easy to break down or wear; release agent bonded to the mold without being transferred to the workpiece to be processed, without prejudice to painting or other secondary processing operations.
The effect of the release agent is to smoothly remove the cured product from the mold to obtain a smooth and smooth product and to ensure that the mold is used multiple times
The specific principle of the release agent is as follows:
1, the polar chemical bond and the mold surface through the interaction to form a regenerative adsorption of the film;
2, the siloxane bond in the polysiloxane can be regarded as a weak dipole (Si + -O-). When the release agent spreads into a single orientation on the surface of the mold, the molecule takes a unique stretch chain configuration;
3, the free surface is covered by the accumulation of alkyl groups, the stripping ability increases with the alkyl density; but when the alkyl space occupies a large steric hindrance, the extension configuration is limited, the stripping ability will be reduced;
4, the release agent molecular weight and viscosity are also related to the stripping ability, molecular weight is small, good spreadability, but poor heat resistance.
The main requirements for the release agent are: have a certain thermal stability and chemical inertia, does not corrode the cavity surface; in the cavity surface residual decomposition products; does not affect the product color, but can give a good appearance, non-toxic; Preparation, easy to use.
Rubber Release Agent refers to a type of substance used to prevent the rubber product from adhering to the surface of the mold and to make it smooth and not to be torn. When used, it is sprayed or applied to the cavity surface to form an effective barrier. The use of Rubber Release Agent is here.
Rubber Release Agent is between the mold and the product between the functional substances in the rubber, plastic manufacturing industry, manufacturing model products, in order to mold, improve production efficiency and extend the life of the mold, while the product smooth, qualified , To reduce waste, and the need to use an essential additive. Its main function is to make the stripping operation easy, to prevent the removal of the product caused by damage. Separation of release agent depends on its surface properties, its significant feature is the critical surface tension is small, it is difficult to be liquid wetting, because of this, in order to achieve the role of stripping.