In the production process, it will be found that the silicone rubber products are brittle and very easy to break, which seriously affects the production, and the brittle silicone rubber products can not meet the requirements in service life. So, what are the reasons for brittleness of silica gel products?
One. The structure or die design of silicone rubber products can lead to easy rupture of products.
The product structure or die design is unreasonable, which leads to the fragmentation of silicone rubber products.
Solution: Modify the structure of the product or die to achieve improvement, for example, slightly thicken the thinner part, slightly chamfer the right corner and so on.
Two. The brittleness of silicone rubber products is caused by too high molding temperature or too long vulcanization time.
Solution: Reduce temperature to control vulcanization time.
Three. Silicone rubber products are brittle due to poor ventilation or high temperature of secondary sulphur addition.
Solution: Attention should be paid to adjusting the ventilation and temperature of secondary sulphur addition.
Four. Silicone rubber itself is raw material.
The main reason of brittleness of silicone rubber products is the reason of the rubber itself. Usually the brittleness of silicone rubber products is due to the poor quality of the rubber itself and the unsatisfactory tear strength. In addition, many manufacturers of silicone rubber products now fill silicone powder into the rubber to reduce costs, which leads to the original tear strength can not reach the required tear strength. The required compound is more brittle.
Solution: For the production of pure rubber without silica powder, for those with slightly higher requirements, we still need to use Toshiba, Xinyue, Dow Corning and other brands of rubber to produce. Special products may also be manufactured with high-tension rubber (meteorological glue) to meet tear strength requirements.
Summary:
Silicone rubber products are famous for their excellent elasticity and high tear strength. The products made of silica gel materials have long service life, comfortable handle and flexible texture, which are incomparable with those produced by other materials. Among the above four reasons for brittleness of silicone rubber products, the possibility of brittleness of rubber compound itself is the greatest, while other factors also exist, but the degree of influence is less. Therefore, when the brittleness of silicone rubber products is found in the production process, the high forming temperature should be excluded first, and then the reasons for the rubber itself should be taken into account.