When mixing liquid silicone and curing agent, you need to pay attention to the following aspects:
1. Mixing ratio
Strictly follow the ratio: The mixing ratio of liquid silicone and curing agent must be strictly in accordance with the instructions or the ratio provided by the manufacturer. The commonly used ratio of addition silicone is 1:1,10:1 or 100:2, and the ratio of condensation silicone is 100:2 (or 100:1.5~2.5). The specific ratio may vary from product to product.
Weight ratio rather than volume ratio: The mixing ratio usually refers to the weight ratio rather than the volume ratio. Therefore, accurate weighing tools are required to ensure the accuracy of the ratio when mixing.
2. Mixing process
Use a mixer: In order to ensure that the liquid silicone and curing agent are mixed evenly, it is best to use a mixer for stirring.
Pour slowly: Pour agent A (silicone) slowly into agent B (curing agent), avoiding violent shaking or pouring to prevent the separation of vulcanizer and accelerator.
Stir evenly: Make sure all materials are fully mixed when stirring to avoid the phenomenon of partial curing and partial non-curing. The layer of silicone attached to the four walls and the bottom of the container should also be stirred vigorously to ensure that there are no dead corners.
3. Operating environment
Keep clean: Before mixing liquid silicone and curing agent, ensure the cleanliness of the working environment to avoid dust, impurities and other polluting materials.
Wear protective equipment: Operators need to wear protective equipment, such as gloves, masks, etc., to protect themselves from chemical substances.
4. Precautions
Do not add other substances at will: Do not add color or powder to the silicone at will without the manufacturer's permission, so as not to cause the glue to react with catalysts and cause non-curing.
Avoid excessive curing agent: Do not add too much or too little curing agent. Adding too much may cause over-curing of silicone and affect performance; adding too little may cause the silicone to not completely cure.
Different models cannot be mixed: Liquid silicone and curing agent of different models cannot be mixed, otherwise it may cause abnormal chemical reactions and affect the curing effect.
5. Subsequent treatment
Bubble removal treatment: The mixed silicone can be vacuumed to remove bubbles to completely remove bubbles and make the finished product smoother and bubble-free. If there is no vacuum machine, the curing time of silicone can be extended, but the effect may not be ideal.
Static curing: After mixing and stirring evenly, place the silicone in a suitable environment to cure. The curing time depends on the specific product, and you can refer to the instructions or the recommendations provided by the manufacturer.
In short, when mixing liquid silicone and curing agent, you need to strictly follow the proportion, pay attention to the uniformity of the mixing process and the cleanliness of the operating environment, and follow the relevant precautions and subsequent processing steps to ensure the quality and effect of the final product.