Rubber Processing Additive Rubber formulation technology is a science and art for the selection and use of materials. The general purpose of the rubber formula is three: the first is to make the rubber products with practical properties; followed by the existing processing equipment can be a good processing operations; Finally, the lowest possible cost of ingredients to meet customer requirements of the physical level. In other words, the design of the rubber formula to consider the three elements for the ingredients of the physical properties, processing and cost, and make the three get an appropriate balance, that is, the recipe design are the most important work.
Ingredients commonly used in recipes can be classified into ten main ingredients:
Rubber raw rubber
Rubber Processing Additive Rubber formula design The first step is also the most important step is to choose rubber substrate or raw material glue. Rubber is a kind of engineering material, regardless of its composition, with some common basic characteristics. All rubber with elasticity, flexibility, toughness, easy to permeable and permeable air and other properties. In addition to these common characteristics, each rubber due to the composition of different, each with its own nature.
Rubber Processing Additive The purpose of adding a vulcanizing agent is to cause the chemical reaction of the ingredients to produce a cross linking between the rubber molecules and to change the physical properties of the rubber. Chemical bridge effect of the rubber ingredients from the soft, with a hot plastic body into a tough heat solid material, this time by the impact of less temperature. So far, sulfur is still the most widely used sulfur fixation agent. Other sulfur donors, such as TMTD (TUEX), are also used as a formulation for all or a partially substituted elemental sulfur in a low sulfur or sulfur-free sulfur system, improving the heat resistance of the product. The second most important work of the recipe designer is the choice for the batching vulcanization system, the vulcanizing agent and the accelerator.
The accelerator can accelerate the rate of vulcanization of the batch.
Activators and Retarders:
Rubber Processing Additive Activators are used to help accelerators enhance their activity and potency. The most commonly used activators are zinc oxide powder, stearic acid, lead oxide, magnesium oxide and amines (H).
Rubber Processing Additive Antioxidants can delay the deterioration of rubber products due to oxygen, ozone, heat, metal catalysis and buckling movement. Therefore, the addition of antioxidants in the ingredients can enhance the aging resistance of products and extend its service life.
Processing additives as the name suggests is to help ingredients for processing operations, such as mixing calendering, extrusion and molding.
Rubber Processing Additive The filler can enhance the physical properties of the ingredients, help to process or reduce the cost. Reinforcing filler can increase the hardness, tensile strength, modulus, tear strength and abrasion resistance of the product. Common commonly used cigarette material or fine particles of mineral materials.
Plasticizers, softeners and tackifiers (Tackfier):
The plasticity, softener and tackifier are used to help the compound knead, change its viscosity, enhance the stickiness of the ingredients, improve the flexibility of the product at low temperatures, or replace part of the compound without affecting the physical properties. In general, these classes of additives can be used as processing aids or extenders.