Publication time：2016-12-09 13:59:56 Browsing number： Source:
Silicone mold is the production of handicrafts for mold glue, is to do all kinds of crafts die. In the production process, what factors will affect the silicone mold it?
First, liquid, liquid or quasi-solid material to resist the flow characteristics of the volume, that is, by external force and flow, the molecules present between the internal friction or flow resistance. Usually the viscosity is proportional to the hardness.
Second, that is what we call the hardness of the local resistance to hard materials pressed into the surface of the capacity known as hardness. Silicone molds have a Shore hardness range of 10 to 80, which gives the designer the freedom to choose the desired hardness to best achieve a particular function. A variety of intermediate hardness values can be achieved by mixing the polymer matrix, fillers and auxiliaries in various proportions. Similarly, the time and temperature of heat curing can also change the hardness, without destroying other physical characteristics.
Third, the tear strength in the incision of the sample when the force impeding the expansion of the incision or scoring resistance. Even after the cut under extremely high torsional stress, heat plus sulfur-type solid silicone mold can not be torn. The heat-sulfur type solid silicone mold has a tear strength in the range of 9-55 kN / m. Fluorosilicone mold tear strength range between 17.5-46.4 kN / m between. Liquid silicone mold tear strength range between 11.5-52 kN / m between.
Fourth, the tensile strength is caused by a rubber material samples tear each unit on the scope of the required force. Heat the sulfur type solid state Shenzhen silica gel mold tensile strength range between 4.0-12.5MPa. Fluorosilicone mold tensile strength range between 8.7-12.1MPa. The tensile strength of liquid silicone molds is in the range of 3.6-11.0MPa.
Elongation usually refers to "ultimate rupture elongation" or as a percentage of the increase in the original length when the sample breaks. Thermal vulcanized solid silicone molds typically have elongations in the range of 90 to 1120%. Fluorosilicone molds generally have an elongation of between 159 and 699%. Liquid silicone molds typically have an elongation in the range of 220 to 900%. Different processing methods and the choice of hardener can change its elongation to a great extent. Silicone mold elongation and temperature have a great relationship.
These are the five factors affecting the silicone mold, therefore, engineers should pay attention to avoid the design, good quality silicone mold can produce high-quality silicone products.