Features of mold release agent Excellent mold release performance, surface tension of spray mold release agent is 17~23N/m. With heat resistance, carbonization decomposition. The chemical properties are stable, and there is no chemical reaction with the molded products. Does not affect the secondary processing properties of plastics. It does not corrode the mold, does not contaminate the product, and has low odor and toxicity. The appearance is smooth and beautiful. Easy to coat and high production efficiency.
How to choose a release agent: choose a release agent according to the template material
The wooden formwork has good water absorption, the release agent has the best isolation effect, and the chemically active release agent can also get the ideal effect. When using the wood formwork for the first time, it is best to fully apply the oil release agent to make it penetrate into a certain depth of the wood formwork to reduce the thickness and quantity of the next coating and prolong the service life of the formwork. If possible, a resin or plastic based synthetic coating is ideal.
The glued template is generally a factory-made template, which is heavily oiled. The release agent of the steel formwork must meet the anti-rust requirements, otherwise the corrosion of the steel formwork will affect the appearance of the concrete. FRP formwork is a plastic formwork reinforced with FRP fibers, and the release agents used for the formwork include oils, waxes and chemically active.
Select release agent according to application requirements
When the component is located underground or in a hidden place, or a concrete project with low requirements for surface aesthetics, you can choose a cheap release agent. If finishes such as paint, grout or plaster are required, wax or pure oil release agents that affect the bonding, stain or discoloration of the concrete surface cannot be selected.
In winter construction, choose a release agent with a freezing point lower than the temperature; in rainy season, choose a release agent that is resistant to rain erosion; in steam maintenance, choose a release agent with qualified thermal stability.
Some release agents can pour concrete after painting, but some can only be poured after drying. Due to the different drying time, some are half an hour, some are more than 20 hours. Therefore, when selecting, it should be considered whether the drying time can meet the requirements of the construction process. The demoulding effect is the same as when demoulding, and it is best to be determined by experiment.
A low-cost mold release agent should be selected. Although some mold release agents have high price per ton, the unit dosage is small or can be used multiple times; some mold release agents have low price per ton, but the unit dosage is large and can usually only be used once. The shipping cost of the release agent should also be considered. Solid, paste or concentrated release agents are shipped to the site and diluted with water. It can save shipping costs and requires comprehensive analysis to choose. Storage conditions should also be considered when selecting a release agent. Release agents containing volatile solvents should be sealed and stored to prevent changes in concentration. In general, release agents should not be temporarily diluted with water when used. Some oil release agents contain certain critical emulsifiers. When diluted, the emulsion is unstable and affects the release effect.
Performance requirements for release agents
The function of the release agent is to smoothly separate the cured product from the mold, so as to obtain a smooth and smooth product, and to ensure that the mold is used multiple times. The specific performance requirements are as follows: mold release (lubrication). When forming a molded product with a uniform film and complex shape, the size is accurate; the demolding continuity is good; the molded product has a smooth and beautiful appearance, and will not cause dust adhesion due to coating with a sticky mold release agent; excellent secondary processing performance. When the release agent is transferred to the molded object, it has no adverse effect on electroplating, hot stamping, printing, printing, bonding and other processed objects; easy to coat; heat resistance; pollution resistance; good molding, high production efficiency; stable good sex. Physically and chemically unstable when used with compounding agents and materials; non-flammable, low odor, low toxicity.
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