What are the processes for configuring the raw materials for custom rubber parts? Many people ask what is the shape of rubber? The aging phenomenon of rubber is also asked by many customers. Next, let's talk about these three questions!The preparation of rubber raw materials can be divided into three basic processes:
1. Mastication: Plasticizing is to cut the raw rubber, and plasticize and homogenize the raw rubber to help the mixing operation of the compounding agent. The effect is to improve the dispersion of the drug, prevent the frictional heat generated in the operation, and cause the rubber to burn, thereby changing the processability of the rubber.
2. Mixing: Mixing is to mix the drug into the raw rubber which is finished by plasticizing, and the quality of the mixing directly affects the quality of the product. The drug is unevenly dispersed, the molecular structure cannot be completely cross-linked, and the rubber cannot achieve the desired physical properties.
3. Extrusion: The raw rubber that has been kneaded, after the extrusion operation, presses out the excess air contained in the rubber compound and completes the required thickness to facilitate the molding work in the mold.
The molecular structure of raw rubber is an elastomer with unsaturated long bonds. Therefore, proper molding additives and external environmental factors (such as time, temperature, pressure, etc.) must be formed in the molding requirements, and the unsaturated bonds should be destroyed. The combination is a saturated bond, and with vacuum assist, the contained air is completely forced out. In this way, the molded rubber can be made to perform its intended characteristics. If there are any defects in the molding process (such as formula error, insufficient time, temperature mismatch, etc.), it can cause physical loss, excess drug release, deformation, aging acceleration, and various serious defects.
Depending on the environmental conditions in which the finished rubber product is located, it may cause cracking or hardening and deterioration of rubber physical properties over time, which is called aging. Causes of aging, external factors and internal factors:
1. External factors: external factors such as aerobic, oxide, ozone, heat, light, radiation, mechanical fatigue, lack of processing, etc.
2. Internal factors: Internal factors include the type of rubber, the molding method, the degree of bonding, the type of compound, and the factors in the processing engineering.