Release agent has been widely used in die casting production. It is an important part of mold cooling. It has important applications in the fields of metal die casting and vacuum foamed sheet, which can effectively extend the service life of the mold. Next, Longhua Die Casting Machine will introduce the concept, application characteristics and use of release agent.

Overview of release agents

1. Definition and role of release agent

1. Definition: Release agent is an interface coating used on the surfaces of two objects that are easy to adhere to each other.

2, role: to form a layer of inert coating between the mold and the mold, so that the mold can be easily removed from the mold, improve the wear resistance and scratch resistance of the final product, it can make the surface of the object easily detached, Smooth and clean.

Second, the principle of release agent

      Since the lubricant substance (release agent) is easy to adhere to the metal surface (mold surface), a static lubricant film layer is formed due to adsorption, thereby reducing the friction between the polymer (mold) and the processing equipment (mold) , Produces a significant film release effect and improve the surface finish of plastic parts.

Classification of release agents

1. Classified by adding method / usage: internal release agent and external release agent. The former is directly added to the molding plastic; the latter is coated on the surface of the cavity of the mold.

2. Classified by chemical composition: inorganic, organic and polymer.

(1) Inorganic release agent

(2) Organic release agent

(3) Polymer release agent

3. Classified by function / application:

Metal demolding: die-cast aluminum (magnesium, zinc), casting, forging, etc .; and rubber, fiberglass, plastic, polyurethane, concrete.

4, classified by shape: powder, liquid and emulsion (can be atomized).

5. Classified by service life: conventional release agent, semi-permanent release agent.

6. Classification by form: solvent-based release agent, water-based release agent, solvent-free release agent, powder release agent, paste release agent

Application of release agent

    Mold release agents are used in various molding operations such as concrete precast parts, products, glass fiber reinforced plastics, metal die casting, polyurethane foam and elastomers, injection molded thermoplastics, vacuum foamed sheets and extruded profiles.

Advantages of release agent:

1. Demoldability (lubricity). When forming a uniform thin film and a complex shape, the dimensions are accurate.

2. Good mold release continuity.

3. The appearance of the formed object is smooth and beautiful, and does not cause dust adhesion due to the application of sticky release agent.

4. Superior secondary workability. When the release agent is transferred to the molded product, it has no adverse effect on processed products such as electroplating, hot stamping, printing, coating, and adhesion.

5. Easy coating.

6, heat resistance.

7. Pollution resistance.

8. Good forming and high production efficiency.

9. Good stability. When used with compounding agents and materials, its physical and chemical properties are stable.

10. Non-combustibility, low odor and low toxicity.

    The effect of the release agent is that the solidified composite product can only be smoothly separated from the mold, so as to obtain a smooth and flat product, and to ensure that the mold is used repeatedly.

     The above is the concept, application characteristics and application of the release agent introduced by Longhua Technology. Practice has proved that the release agent can separate the cured composite material from the mold to obtain a smooth and flat product, so that the mold can be used multiple times. Effectively improve the use efficiency and service life of molds and reduce corporate material consumption.