The silicone watch explains that we are no stranger to the rubber strap. Silicone is the new darling of watchband material, often appearing in sports watches and diving watches. On the surface, this strap is very similar to a traditional rubber strap, but it seems different.
Silicone watches illustrate that silicone is a huge family, divided into two major groups: inorganic silica gel and organic silica gel. Inorganic silica gel is a highly active adsorbent material and is usually prepared by the reaction of sodium silicate and sulfuric acid and a series of post-treatment processes such as aging and soaking. Its main component is silica, which is structured like a sponge. The pores communicating with each other constitute a capillary pore adsorption system with a large surface area, which can adsorb and condense water vapor equivalent to 40% of its own weight, and is therefore mostly used as a desiccant. Although inorganic silica gel is not used for watchbands, it is often used in the care of wristwatches. As long as silicone particles and water-filled wristwatches are placed in a closed container and taken out after a few hours, the water in the watch is not It will all disappear.
Our daily use is more organic silicone, which is divided into silicone rubber, silicone resin and silicone oil, a special rubber in synthetic rubber. The commonly used material in watch bands is a small branch of the silicone family, room temperature vulcanized silicone rubber (RTV) in silicone rubber.
The raw materials for the production of silicone rubber are silicon powder, methanol, and hydrochloric acid. Silicon rubber can be finally obtained through a series of complicated chemical processes. This silicone rubber is also called "liquid silicone" because of its low molecular weight and its liquid state at room temperature. After mixing the crosslinker and the platinum catalyst in the liquid silica gel, it is injected into the mold and cured after a period of vulcanization reaction (it can be reacted at room temperature, so it is called room temperature vulcanized silicone rubber, it can also be slightly heated Increase reaction speed). And form the final product. Adding different additives can make silicone materials with different specific gravity, hardness, strength, color and texture.
Silicone rubber has better resistance to high and low temperature than general organic rubber. In the space where the sun cannot reach, traditional rubber will be frozen and become brittle, sealing and sealing during the period. The most important feature of silicone rubber developed as a space material is that it is not afraid of high temperatures and can withstand extreme cold. Whether it is in the extreme environment of 300°C or -90°C, it can keep the chemical structure calm, without losing the original flexibility.
Silicone watches also have no bacterial growth compared to natural rubber. And its surface tension is very low, not easily infiltrated by sweat and rain bubble deformation, with strong waterproof corrosion. Therefore, the mission life of silicone rubber products in the natural environment can reach several decades.
Silicone rubber is also not all-powerful, and its tear resistance is a lower category in rubber. Therefore, it is easy to generate a small crack due to a large external force at the connecting portion between the silicone watch band and the metal buckle. Therefore, when using a silicone strap, it is necessary to pay attention to the connection betweenthe strap and the metal buckle, and do not pull it vigorously. In addition, the silicone strap should be wiped with a soft cloth to remove some hard dust particles to prevent it from scratching the surface of the silicone to produce small cracks, and it can also effectively extend the life of the strap.
The description of the silicone watch distinguishes between the silica gel and the ordinary rubber method. The infrared spectrum analysis can scientifically judge the type of the corresponding material by different absorption peaks on the spectrum. But for the consumer, it can only be discerned through the senses. In general, silica gel products are colorless and odorless, transparent when no pigment is added, and black silica gel and colored silica gel can also be obtained if different dyes are added. However, rubber products will have more or less some flavor. Natural rubber itself has a bit of protein, while rubber processed with sulfur produces a special taste. As for some people, judging by their softness, it is wrong to think that silicone is softer than rubber. Because ordinary rubber or resin materials pass different additives, the same softness as silicone products can be achieved.