Rubber Processing Additive formulation technology is a science and art for the selection and use of materials. The general purpose of the Rubber Processing Additive formula is three: the first is to make the Rubber Processing Additive 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 Processing Additive 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 Processing Additive raw Rubber Processing Additive
Rubber Processing Additive formula design The first step is also the most important step is to choose Rubber Processing Additive substrate or raw material glue. Rubber Processing Additive is a kind of engineering material, regardless of its composition, with some common basic characteristics. All Rubber Processing Additive with elasticity, flexibility, toughness, easy to permeable and permeable air and other properties. In addition to these common characteristics, each Rubber Processing Additive due to the composition of different, each with its own nature.
The purpose of adding a vulcanizing agent is to cause the chemical reaction of the ingredients to produce a cross linking between the Rubber Processing Additive molecules and to change the physical properties of the Rubber Processing Additive. Chemical bridge effect of the Rubber Processing Additive 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:
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).
Antioxidants can delay the deterioration of Rubber Processing Additive 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.
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,Rubber Processing Additive 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.
Pigments are used in non-charcoal ingredients to provide specific colors. Commonly used pigment can be divided into organic and inorganic class. Inorganic iron oxide, chromium oxide, titanium dioxide (titanium dioxide), cadmium sulfide, cadmium selenide, antimony sulfide, mercuric sulfide,Rubber Processing Additive lithopone and blue. Organic colorants are much more expensive than inorganic pigments. But its use of good results, hue bright and the proportion is very low. And the color of organic pigment changes more than inorganic color material. However, most organic pigments are not stable to steam, light, acid or alkali, and sometimes migrate to the surface of the product.