Functional application of the hottest rubber Rotor

Functional application of rubber Rotorless vulcanizer

rubber vulcanization tester (hereinafter referred to as vulcanizer) is used to analyze and determine the scorch time, positive vulcanization time, vulcanization rate, viscoelastic modulus, vulcanization flattening period and other performance indicators in the rubber vulcanization process. It is a testing instrument specified by the state for developing new products, studying rubber formula and inspecting product quality

manufacturers of rubber products can use vulcanization instrument to test the reproducibility and stability of products, and design and test the rubber formula. Manufacturers can improve the publicity and implementation of new material standards to carry out on-site inspection on the production line, and master whether the vulcanization characteristics of each batch, even at each moment, meet the product requirements. It is used to determine the vulcanization characteristics of unvulcanized rubber. Through the reciprocating oscillation of rubber in the mold cavity, the reaction torque (force) to the mold cavity can be obtained. This is of great significance for the study of computer control. The vulcanization curve of moment and time can be scientifically determined. The three elements of vulcanization time, temperature and pressure are the key to the final determination of product quality, and the physical properties of compound can also be determined. Quality management of raw materials, processing process and finished products:

one can master the relevant characteristics of rubber in the vulcanization process through the vulcanization curve. From the mixing degree and processability of rubber to the physical properties of products (such as anti-aging), it can be judged from the vulcanization curve. Further achieve the control of rubber quality

disulfide instrument is widely used in the research of raw materials and formulas, providing data for processing and production. In addition, vulcanizers are also widely used for quality control, supervision and product quality identification

1. Research and develop new formulas and products:

(1) through the vulcanizer, the curves of rubber under different formulas can be obtained, and then the cost, product quality... And other items can be compared. It can effectively shorten the research and development time

(2) the basic performance of a new formula or a new raw material can be evaluated

2. Applied to the classification and identification of products:

for example, natural rubber can be graded according to the results of the standard formula determined by the vulcanizer. The United carbon black company of the United States takes the vulcanization curve as the best method to judge the quality of its carbon black, and only provides the vulcanization curve as the performance index for some of its products

3. It is much faster, more convenient and more accurate to measure the positive vulcanization time with a vulcanizer than to use the traditional method (that is, the method of drawing after stress-strain test with a group of specimens vulcanized under different vulcanization conditions), and it also saves materials, which is indeed a faster, better and more economical method

5. The application of scorch time can avoid the occurrence of dead glue and evaluate the operability of the formula

6. That is, the vulcanization of thick walled products such as polyester fibers such as tires is not an isothermal process, and the temperatures of various parts are very different. The vulcanization process of the rubber compound under actual heating conditions can be very realistically measured by using the vulcanization simulator and the vulcanization instrument controlled by temperature process, which provides a strong basis for determining the production and processing

7. In terms of cost:

(1) shortening the time course of R & D can greatly improve the efficiency of R & D funds, and relatively speaking, it reduces the cost of R & D

(2) the quality management of raw materials, processing and finished products can improve the efficiency of raw materials and reduce the waste of rubber

due to the accuracy and convenience of vulcanization instrument, it has become one of the most effective means of off-line (intermediate production) quality control of Vicat softening point experimental machine experimental principle in the production process of modern rubber factory. Generally, the relative error of stress-strain test is 3% - 4%, while that of vulcanizer is 1% - 2% or less. Therefore, small differences in raw materials or rubber compounds of various batches in production are easy to be found and play a role in quality control

it can be seen that the accurate results measured by the precision vulcanizer provide an important technical basis for production, breaking the situation of relying solely on experience to ensure quality, thus avoiding the quality problems of under sulfur or over sulfur and uneven mixing of products, causing rework, saving costs, and improving production efficiency. It is fully capable of formulating formulas scientifically according to the working conditions provided by users, and using advanced testing equipment to determine the vulcanization process parameters, so as to ensure the performance of products and meet the quality requirements of users

two definitions:

a, scorch - the phenomenon of early vulcanization of rubber due to storage, transportation, processing, and high temperature of the surrounding environment, which reduces the plasticity and increases the elasticity of rubber, resulting in the inability to process, is called scorch. The longer the scorch time, the better the processing safety

b. vulcanization - a process in which rubber molecules form a spatial three-dimensional structure from a single linear structure under certain conditions

1. Scorch time TSL, TS2...: vulcanization time T50, T90

in engineering, positive vulcanization is also called the most suitable vulcanization, which refers to the vulcanization state in which the main properties of rubber products reach or approach the best value

positive vulcanization time refers to the time required for rubber products to reach the positive vulcanization state. In fact, the positive vulcanization time is a range, not a point. The longer the flattening period, the better the physical properties of rubber.

the positive vulcanization time in engineering is different from that in technology. For products with thin thickness, the process positive vulcanization time T90 measured by rheometer is the same as that of products. For thicker products (such as tires), The situation is different.

the determination method of positive vulcanization is to use special instruments: the scorch time can be measured by using the sulfur rheometer (the induction period time T10, which is mostly expressed by TS2 in recent years, with the same significance as T10), the process positive vulcanization time T90, and the vulcanization speed. (in addition, the foaming rheology can only measure the foaming time T@Pc90 , foaming pressure, foaming rate, etc.). The experiment confirms that the rheometer measurement results are consistent with the theoretical positive vulcanization. Because the rheometer can measure a series of vulcanization characteristics, it is not necessary to do many constant elongation stress tests at vulcanization points, which saves human and material resources.

2. Whether the rubber and chemicals are mixed evenly

the rheometer can provide the mixing uniformity diagram and the mixing uniformity variation of rubber, To check whether the rubber and chemicals are evenly mixed.

3. Check whether the rubber is plasticized

check the uniformity and processability of the rubber before adding chemicals

4. Shorten the development time of new products and bring products to market early.

when customers provide new samples and formulate physical property requirements, developers use rheometer to do various experiments instead of on-site production machine experiments, which can develop new products in advance and save costs

5. When the price of chemicals or compounds rises, the rheometer is used to modify the manufacturing formula, and other drugs or low-cost compounds are used to meet the original physical requirements and reduce the cost. (end)