1. What is the ratio of injection molding silicone? What is the viscosity that customers generally require?
Answer: The common ratio of two-componentA:B injection molding silicone is 1:1; and the ratio of 1 : 1 is the best operation and injection. 2. The customer will require the hardness number (from 10°~80° ), and the viscosity is generally between ( 300,000~1,200,000 ).
2. What are the parameters of injection molding silicone? Can the company provide written parameters?
A: Tensile force, hardness, viscosity, elongation, compression deformation, resilience, tear strength, etc.
3. What problems do customers usually encounter in the process of using injection molding silicone ? How to solve these problems?
1. Incomplete vulcanization and too long vulcanization time Reasons: low mold temperature, long vulcanization time, high mold temperature, fast vulcanization time. Generally, the mold temperature is controlled at a minimum of 150 degrees and a maximum of 180 degrees. The length of the silicone vulcanization time is related to the size of the product: the longer the product Small, the shorter the silicone curing time, the greater the thickness of the product, the larger the mold, and the longer the silicone curing time.
2. Why does the product change color after silicone molding? Over time after the silicone is formed, any silicone will oxidize. Colored silicone products usually do not see oxidation. (may add antioxidants to the liquid glue later)
3. What kind of hardness should the silica gel choose? Silicone products should be selected according to the size and size of the product, and silica gels with different hardnesses should be selected to meet the requirements of customers. General hardness ranging from 10 degrees to 80 degrees. Products with a hardness lower than 10 have low tear strength, but the elongation will be large and the deformation rate will be large. If the hardness is greater than 70 degrees, the tear strength will also be poor, and the silicone will become brittle and easy to break or break. Generally, when the hardness of silica gel is 30-50 hardness, the tear strength and tensile force are the best, including elongation, resilience, and physical properties will be in the best state.
4. What are the common packaging of injection molding silicone? How long is the shelf life usually?
A: How long is the service life of the finished product? Usually20kg (sample), 200kg iron drum; the maximum shelf life is 6 months;
5. Can condensed silica gel be used for injection?
Answer: It is not necessary to use an injection machine to inject silica gel, but condensed silica gel cannot be used for injection molding operation. The reason is: the proportion of curing agent is too small, it is difficult for the injection machine to inject uniformly, the most important thing is that heating will cause The product is sticky and does not dry.
6. During the operation of injection molding silicone, can you choose suitable pigments according to the requirements of customers' products, and prepare various colors for customers to use?
Answer: The color of silica gel can be adjusted, but for addition-type silica gel, in the process of color-adjusting, it is necessary to choose suitable pigments. Some pigments will poison the addition-type silica gel, and the silica gel will not be vulcanized. For example, those containing organotin:N , P , S, heavy metal pigments. Injection glue is also an addition type of silicone. Injection molding silicone: product shrinkage rate is 1% (heating at 80°C-220°C , high temperature will cause partial changes in product shrinkage rate).
