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classification of rubber formulas n.
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  1. Classification of rubber formulas The rubber product formulations according to different uses can be classified into the following three types. 1. Basic formula (standard formula) The base formula is also known as the standard formula and is used for the inspection of raw rubber and compounding agents. When using a raw rubber or a compounding agent for the first time, the basic processing properties and physical properties are tested using a base formula. The design principle of the basic formula is to use the traditional blending amount to compare with the similar materials in the past; the formula should be as simple as possible, including only the basic components that reflect the basic process properties of the rubber compound and the basic physical properties of the vulcanizate. The compound consisting of these basic components can reflect the basic process properties of the rubber (such as Mooney viscosity, Mooney coke, etc.) and reflect the basic physical properties of the vulcanizate (such as hardness and tensile strength). Strength, tensile stress, elongation at break, etc.). It can be said that these basic components are indispensable. The basic formulas of different departments are often different, but the basic formula of the same rubber is basically the same. Natural rubber, isoprene rubber, neoprene rubber and other crystalline rubbers with self-reinforcing ability. The basic formula: r can be blended with pure rubber without reinforcing agent, and the pure rubber of general synthetic rubber is too strong. Low does not reflect the practical situation, so add a reinforcing agent. At present, the more representative base formula is the basic formula of various rubber products proposed by American Society for Testing and Materials (ASTM). Based on the empirical data accumulated by the unit, the basic formula is designed by analyzing the advantages and disadvantages of the current production formulas of similar products and similar products.

  2. 2. Performance formula (technical formula) The formulation design for the rubber product to meet certain performance requirements is to meet the performance requirements and processing requirements of the product, and to improve certain characteristics. The performance formula should be based on the basic formula, and comprehensively consider the combination of various properties to meet the requirements of the product use conditions. Usually, the test formula made by the formulator in the product development of the laboratory is a performance formula, and the performance formula is the formula most used by the formulator. 3. Practical formula (production formula) The practical formula is also called the production formula. Due to the performance formula developed under the laboratory conditions, there are often some technical problems when it is put into production. For example, the dispersibility of the compounding

  3. agent during mixing is not good, and the scorch of the rubber compound is not enough. The length is short, the mouth shape is large when extruded, and the pressure roller is rolled. Therefore, the performance developed from the laboratory must be evaluated by on-site production equipment and production process conditions. This is the so-called expansion test. Only the rubber formula without problems can be officially put into production. If there are processing problems in the expansion test, it is necessary to further adjust the formulation to improve the process performance of the rubber compound without changing the basic properties of the vulcanizate. In some cases, it is necessary to adopt a method of slightly lowering physical properties and performance to adjust the process performance of the rubber compound, that is, to compromise between the physical properties, performance and process properties of the rubber product, in order to obtain practical value. A practical rubber formula with better overall performance. The process performance of the compound sometimes depends not only on the compound formulation, but also on the technical development conditions of the plant. Due to the continuous improvement of the production equipment technology and production process, the adaptability of the rubber compound, such as accurate temperature control, will be expanded. And the establishment of an automated continuous production process has made it possible to process compounds that were previously considered to be unsatisfactory in process performance. But no matter how advanced the equipment and process, specific production conditions and current process requirements must be considered when researching and applying a formulation. In other words, the formulator must not only be responsible for the quality of the finished product, but also the applicability of the formulation in each production process under the existing conditions.