Improving the tensile strength of silicone is a comprehensive process, involving formula adjustment, additive use, manufacturing process optimization and other aspects. Here are some specific methods:
1. Use of additives
Toughening agent: Toughening agent is an additive that can enhance the toughness and toughness of materials. It changes the physical and chemical properties of silicone to make it have better tensile resistance. Commonly used tougheners include acrylate, styrene-butadiene dispersed phase copolymer (SBS), styrene-butadiene block copolymer (SIS), etc. Among them, acrylate has a good toughening effect and can significantly improve the tensile strength and elongation at break of silicone. It should be noted that the amount of toughening agent added needs to be precisely controlled. Excessive addition will lead to a decrease in tensile strength.
Professional silicone reinforcing agent: This reinforcing agent can closely combine with silica gel molecules through a fine chemical formula to form a strong network structure, thereby significantly improving the tensile strength and tear strength of silicone products. At the same time, it can also improve the mechanical properties of silicone, improve wear resistance and scratch resistance, and extend service life.
2. Optimize formula ratio
Appropriately increase the proportion of fillers in silica gel: commonly used fillers include silica, alumina, calcium carbonate, etc. These fillers can not only reduce the cost of elastomers in silicone formulations, but also effectively increase the hardness, tensile strength and free flow of silicone.
Comprehensive consideration of the interaction and ratio of various components of silica gel to achieve optimal tensile strength.
3. Manufacturing process optimization
Injecting nitrogen: During the production process of silica gel, injecting nitrogen can reduce its internal oxygen content, thereby improving the tensile properties of the silica gel.
Control curing time and temperature: Curing time and temperature are important factors affecting the physical properties of silicone. By optimizing these parameters, the tensile strength of silicone can be further improved.
4. Other methods
Use plasticizers: Plasticizers can increase the softness and plasticity of silicone, thereby improving its tensile properties. But you also need to pay attention to the control of the amount of addition.
Improve the mixing process: ensuring that the silica gel raw materials and various additives are fully mixed and evenly mixed will help improve the tensile strength of the silica gel.