The Composition Of The Rubber Formula

1. The composition of the rubber formula

There are many ingredients in rubber formulations, and these ingredients are also called compounding agents. Each component has a different effect in the compound. It is because of the common reaction of many compounding agents that the rubber compound has corresponding physical and mechanical properties and production and processing characteristics. The rubber compound formula consists of the following parts.

(1) Raw rubber: It is the key material of the formula, but it is a single type of rubber, it can also be a combination of two or more types of rubber, or a rubber-plastic blend. The category of raw rubber and the content in the formula determine the most basic characteristics of the rubber. For example, the raw rubber in the formula is natural rubber. Elasticity; the raw rubber is nitrile rubber, the formula rubber has high-quality oil resistance, etc.

(2) Vulcanization system: Contains vulcanizing agent, accelerator and active agent. Vulcanizing agents such as sulfur, peroxides, sulfur donors, etc., are used in the formulation to form crosslinks between rubber macromolecules to form a network-like three-dimensional structure, so that the rubber has higher strength, elasticity and other physical and mechanical properties. The effect of accelerators in the formulation is to promote the vulcanization rate and reduce the vulcanization time. Its categories include thiazoles, sulfenamides, thiurams, guanidines and thioureas, etc.; the effect of the active agent is to enhance the accelerator. Activity, also known as booster. The key categories are metal oxides such as zinc oxide and organic acids such as stearic acid. The three types of vulcanizing agents, accelerators, and active agents react together to make the rubber compound reach a sufficient vulcanization surface with certain physical and mechanical properties.

(3) Protection system: The key role in the formulation is to prevent the degradation of rubber products due to the effects of light, heat, and oxygen in the air during storage and application, or further cross-linking, hardening and other aging problems. Its key categories include various amines and substituted phenols.

(4) Reinforcing filling system: The reinforcing agent contains various types of carbon black and white carbon black, which have a reinforcing effect in the rubber compound. The tensile strength, tensile stress, hardness and other mechanical properties of the rubber can be significantly enhanced; fillers such as clay, calcium carbonate, silica fume, etc. in the rubber are mainly used for filling and cost reduction effects, which have an impact on the physical and mechanical properties. The dedication is small.

(5) Adhesion system: Its function is to strengthen the adhesion between rubber and framework materials such as steel cords, fibers and fabrics, such as resorcinol formaldehyde white carbon black system, cobalt salt system, resorcinol acetaldehyde resin (RE ) System or resorcinol formaldehyde resin and cobalt salt combined system, etc.

(6) Processing aids: Contains various processing oils, peptizers, homogenizers, dispersants, etc. The main role in the formulation is to enhance the ease of processing of the rubber, reduce energy consumption, promote lubricants, tackifiers, and adjust the hardness of vulcanized rubber. Such as various petroleum-based softeners, synthetic ester-based reinforced rubber materials, flow-based phenolic resins, aromatic disulfides, pentachlorothiophenol and other saponin, petroleum resin alkyl phenolic resins, aromatic disulfides, pentachlorothiophenol Wait.

(7) Other components:

Such as colorants, coupling agents, antistatic agents, foaming agents, solvents, etc.