(a) classification for rubber formulation
In accordance with the use of different formulations of rubber products can be divided into three types as follows.
1 basic formula (the standard formula)
The basic formula and standard formulation, generally used for identification of rubber and a complexing agent. When the initial use of a rubber or compound, test its basic processing and physical properties using basic formula. Design principle of formulation is used in conjunction with the traditional, so that compared with the previous similar materials; formulation should be made as simple as possible, including only can reflect the basic set of basic physical properties of basic process performance of the rubber and vulcanizate is divided, by these basic groups into the compound, can reflect the basic process performance of the rubber (such as Mooney viscosity, Mooney scorch and so on), but also can reflect the basic physical properties of vulcanizate (such as hardness, tensile strength, tensile stress, tensile elongation etc.). Can say, the basic component is indispensable. The basic formula of different departments are often different, but the basic formula of the same kind of basic, similar to.
Natural rubber, isoprene rubber, neoprene rubber has since the 5 reinforcing ability of crystalline rubber, foundation: R can be used with pure glue without reinforcing agent, and pure gum general synthetic rubber, its strength is too low can not reflect the practical situation, so you want to add a reinforcing agent. The basic formula of representative is the American Society for testing and materials (ASTM) of various kinds of rubber formulation as proposed by the standard. A unit of data accumulated experience as the foundation, and analyses the advantages and disadvantages of similar products and similar products the production formula to design the basic formula.
2 Properties of the formula (formula)
The formula design of rubber products in order to make certain performance requirements, its purpose is to satisfy the performance requirements of product and process improvement, some characteristics. Properties of the formula should be based on full consideration of basic formula, with a variety of performance, is to meet the product requirements. Experimental formula do usually formula design personnel for product R & D in the test room is belong to the properties of the formula, properties of the formula is a formula formula designers with the most.
3 practical formula (formula)
A practical formula is also called the production formula, because the performance formula developed under laboratory conditions, the production often will have some technical problems, such as mixing with mixture of poor dispersion, scorch, inch short, extrusion die swell, calendering roller etc.. Therefore, developed from the laboratory performance unitary board, must pass through the field production equipment and production technology condition assessment, it is often said, the enlarge test, only through the enlarge test rubber formula is no problem, in order to officially put into operation. If there are processing expansion test problems, we need not change the basic properties of the vulcanizate conditions, process performance to further adjust the formula to improve rubber. Process performance in some cases to take method slightly reduced physical performance and use performance to adjust the rubber material, that is a compromise between the rubber physical properties, performance and processing performance, in order to obtain the practical value of the good comprehensive properties and practical rubber formula. Process performance of the rubber, and sometimes not only depends on the formulation, also have close relationship and the development conditions of the factory, the production equipment and production process of continuous improvement, will expand the glue material adaptability, establish such as accurate temperature control and automatic continuous production process, one might think that sizing process performance is not ideal for processing the previous. But no matter how advanced equipment and technology, the research and application of a formula, must take into account the specific conditions of production and the current process requirements. In other words, formula designers should not only on the finished product quality, but also give full consideration to the existing conditions, the applicability of the formula in the production process of the.
