Analytical silicon rubber mold plastic mold production of specific treatment processes

Our silicon rubber mold plastic production from the 1980s started. According to the Shenzhen-Hong huge Precision Co. person in charge: the next ten years, China-made silicon rubber mold plastic products can only occupy a certain share of the low-end market, high-end market has been monopolized by imported products. After the mid-1990s, made of silicone rubber mold rubber in terms of both quantity and quality have achieved rapid development. Today, domestic silicon rubber mold rubber not only in quality comparable with the imported products, on the production capacity is also fully able to meet market demand. The reason is mainly due to the progress of the silica surface treatment technology. Silica surface treatment process, the treatment agent selection and the process is important, equally important to the selection of equipment, silicon rubber mold plastic production of specific treatment processes are also important advantages.
Silicon rubber mold plastic production process is a specific process in the reactor, according to the formula into dimethyl silicone oil, silica, and bis (trimethylsilyl) amine, while adding silazane 20% of water, the material fully kneaded Synthesis homogeneous paste, followed by heating, insulation 2 h at 180 ~ 190 ℃ after the start of evacuation. To complete removal of ammonia generated, vacuum time is generally more than 1.5 h.
(A) mixed filler and 107 silicone rubber. This process does not respond to the process, mixing or dispersion is uniformly purpose of this process. It should be noted that the temperature of the process is not too high, generally should be below 140 ℃; at the same time, to make a better dispersion of the filler, the filler should be added after the filler is substantially uniformly dispersed, together with 107 of silicone rubber.
(B) adding additives mixed with the secondary. Other components of silicone rubber mold needs to be added, such as deep curing aids, anti-erosion additives can be added in this step may be added after the relevant aid previously ground if necessary; while adding an appropriate amount of dimethyl silicone rubber mold row to improve foam properties. Another effect of this process is that it can make the quality of the entire batch of the product is more uniform, so that product quality is more stable.
(C) grinding. The purpose of this step is to better silica and filler dispersed among 107 silicone rubber and silicone, while allowing a more even delicate plastic mold. Taking into account the protection of the grinding equipment, the process of the material temperature below 80 ℃.
(D) filtering and weighing and packaging. Filtration is to remove the material remaining clumps substance and impurities. To improve efficiency, the filter material temperature is not too low, the suitable temperature is 50 ~ 60 ℃, lower viscosity material at this temperature, filtered naturally fast speed. At the same time, the package should be hot. Thus gas, for good airtight packaging container, after the material temperature is reduced, since the thermal expansion and contraction will form a negative pressure in the packaging container, so that the object to be packed more tightly cover suck, to further improve the packaging of tightness. To improve the airtightness of the package has a very important significance. Because the plastic mold can absorb moisture from the air, the water will accelerate the plastic mold part structure, reduce its storage stability. In selecting the packaging container on drums often better than plastic bucket tightness, thus silicon rubber mold rubber and longer shelf life; at the same time, more convenient transport than plastic drum barrel.