The problems encountered in the operation of mold silicone rubber and the related solutions

One: The silicone rubber of the mold is partially cured or not cured

When using liquid silicone to make silicone molds, sometimes we find that after 48 hours, the mold silicone is still not cured, or only part of the cured part is not cured. What is the cause of the non-curing?

Reason 1: Too much curing agent or too little curing agent will affect the curing of silicone;

Solution: Add according to the specified curing agent ratio, and see clearly whether the instructions are volume ratio or weight ratio.

Reason 2: Different types of curing agents cannot be mixed, and the addition mold glue will not react when it comes in contact with the tin component in the condensation type silica gel;

Solution: Use the curing agent of the corresponding model. Operating tools are also classified and not mixed. If it is an addition molding silica gel, never come into contact with condensation products.

Reason 3: The mixing of silica gel and curing agent is not uniform;

Solution: When operating the silica gel and curing agent, stir them evenly and pay attention to the on the bottom of the container.

Reason 4: Incomplete curing (not dry) only occurs on the contact surface of the master mold, and other parts are cured intact;

Solution: Make sure to put a layer of isolation film on the surface of the master mold to prevent the components in the master mold that are not conducive to the curing of the silicone from contacting the mold silicone.

Reason 5: The temperature is too low to cause non-curing. When the operating temperature is lower than 0 degrees, the silica gel and the curing agent will not react;

Solution: When the temperature is 20-30 degrees Celsius, it is the most ideal mold silicone curing temperature.