The rubber vulcanization tester (referred to as the vulcanization instrument) is used to analyze and measure the scorch time, positive vulcanization time, vulcanization rate, viscoelastic modulus and vulcanization flat period of the rubber vulcanization process. It is a national regulation for the development of new products, Research instruments for studying rubber compound formulas and product quality.
Manufacturers of rubber products can use the vulcanizer to test the reproducibility and stability of the products, and to design and test the rubber formula. Manufacturers can conduct on-site testing on the production line to know whether the vulcanization characteristics of rubber in each batch or even every moment meet the product requirements. It is used to determine the vulcanization characteristics of unvulcanized rubber. The rubber reciprocates in the mold cavity to obtain a vulcanization curve of torque and time against the reaction torque (force) of the mold cavity. These three major factors, which are the key to ultimately determine the quality of the product, can also determine the physical properties of the compounding of the rubber compound. Quality management of raw materials, processing, and finished products:
One can grasp the relevant characteristics of rubber in the vulcanization process through the vulcanization curve. From the degree of rubber mixing, the processability to the physical properties of the product (such as anti-aging), etc. can be judged from the vulcanization curve. Further achieve the quality control of rubber.
The vulcanization curve measured by the disulfide meter is widely used in the research of raw materials and formulas to provide data for processing and production. In addition, the vulcanization instrument is also widely used in production quality control, supervision and product quality identification.
1. Research and develop new formulas and new products:
(1) Through the vulcanization instrument, you can obtain the curves generated by the rubber under different formulations, and then compare the cost, product quality ... and other items. Can effectively shorten the development time.
(2) The basic performance of a new formula or a new raw material can be evaluated.
2. Applied to the classification of products:
For example, natural rubber can be graded based on the results of a standard formula measured by a vulcanizer. The United Carbon Black Company of the United States regards the vulcanization curve as the best method to judge the quality of its carbon black, and only provides the vulcanization curve as a performance index for some of its products.
3. Using the vulcanization instrument to measure the positive vulcanization time is faster, more convenient and more accurate than the traditional method (that is, a group of test pieces vulcanized under different vulcanization conditions for drawing after stress and strain test), and the materials Saving is indeed a quick and easy way to save.
5. The application of scorch time can avoid the situation of dead glue, and can also judge the operability of the formula.
6. The vulcanization of thick-walled products such as tires is not an isothermal process, and the temperature of each part is very different. Using a vulcanization simulator and a vulcanization instrument controlled by a temperature process, it is very realistic to determine the rubber under actual heating conditions The vulcanization process provides a strong basis for determining production and processing.
7. In terms of cost:
(1) The shortened R & D schedule 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 the use of raw materials and reduce the waste of rubber materials.
Due to the accuracy and convenience of the vulcanization instrument, it has become one of the most effective means of offline (intermediate production) quality control in the production process of modern rubber plants. The relative error of the stress-strain test is usually 3% to 4%, and the vulcanization instrument is 1% to 2% or lower. Therefore, the slight differences in the raw materials or compounded rubber of each batch in the production can be easily found and play a role in quality control.
It can be seen that the accurate results of the test by the precision vulcanization instrument give an important technical basis during production, breaking the situation of ensuring quality by experience alone, thus avoiding the quality problems caused by the lack of sulfur or excessive sulfur and uneven mixing of the product. , Causing rework, saving costs, and improving production efficiency. It is fully capable to formulate formulas scientifically according to the requirements of the working conditions provided by users, and use advanced testing equipment to determine the technological parameters of vulcanization to ensure the performance of products and meet the quality requirements of users.
Two definitions:
A. Scorch-due to storage, transportation, processing, and high temperature of the surrounding environment, the rubber has early vulcanization, which reduces the plasticity of the rubber and increases its elasticity, making it impossible to process. It is called coke. burn. The longer the scorch time, the better the processing safety.
B. Vulcanization-the process by which rubber molecules form a spatial three-dimensional network 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 means that the main properties of rubber products reach or close to the optimal value of the vulcanization state.
Positive vulcanization time refers to the time required for a rubber product to reach a positive vulcanization state. In fact, the positive curing time is a range, not a point. The longer the flat period, the better the physical properties of the rubber.
The positive vulcanization time in engineering is different from the T90 in the process of vulcanization. For products with relatively small thickness, the process vulcanization time T90 measured by the rheometer is the same as that of the product. For thicker products (such as tires) ), The situation is different.
The measurement method of positive vulcanization is to use a special instrument: the scorch time can be measured by using a sulfur change meter
(The induction period time T10 is expressed by Ts2 in recent years, the meaning is the same as T10), the process positive curing time T90, and the curing speed. (Another: foaming rheology can only measure the foaming time T @ Pc90, foaming pressure, and foaming rate, etc.). The experiment confirms that the measurement results of the rheometer are consistent with the theoretical normal vulcanization. Because the rheometer can measure a series of vulcanization characteristics, it is not necessary to do many constant tensile stress tests at the vulcanization point, thus saving manpower and material resources.
2. Whether the rubber and chemicals are mixed evenly. The rheometer can provide the mixing uniformity graph and the rubber compound uniformity variability to detect whether the rubber and chemicals are mixed evenly.
3. Examine whether the rubber compound has the homogeneity and processability before the plastic compound is added to the chemical compound.
4. Shorten the development time of new products, provide new samples to customers on the market early, and formulate physical properties requirements, developers use rheometers to do various experiments, instead of on-site production machine experiments, you can develop new products early and save costs.
5. When the price of chemicals or rubber compounds rises, use a rheometer to modify the manufacturing formula and use other drugs or low-priced rubber compounds to meet the original physical properties requirements. Can reduce costs. Jiangdu Kaiyuan Experimental Machinery Factory specializes in the production of rubber rotorless vulcanization instrument
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