SIS Rubber Manufacturing Method
SIS rubber (styrene-isoprene-styrene triblock copolymer) is an important raw material for chemical production, and is widely used in the manufacture of hot-melt adhesives, pressure-sensitive adhesives, rubber modifiers, and other fields. The manufacturing method of SIS rubber will be introduced below.
I. Raw material preparation
1. Styrene (St): industrial grade, purity ≥99%.
2. Isoprene (Ip): industrial grade, purity ≥98%.
3. initiator: usually organic peroxide, such as benzoyl peroxide (BPO).
4. Solvent: used to adjust the viscosity of the reaction system, usually use toluene or petroleum ether.
II. Manufacturing process
SIS rubber manufacturing solution polymerization method, including the following steps:
1. batching: according to the predetermined formula, styrene, isoprene, initiator and solvent added to the reactor.
2. Stirring and heating: turn on the stirrer to fully mix the reaction materials, and at the same time heat the reactor to a predetermined temperature.
3. Initiation of polymerization: When the temperature in the reactor reaches a predetermined value, add the initiator to initiate the polymerization reaction.
4. Constant temperature reaction: At a constant temperature, the reaction is allowed to proceed for a certain period of time to ensure the full growth of SIS rubber molecular chains.
5. Post-processing: After the reaction is finished, the reaction product is subjected to post-processing operations such as de-volatilization, filtration, washing and drying to obtain the finished SIS rubber product.
3. Precautions
1. Strictly control the reaction temperature and time to ensure that the structure and molecular weight distribution of SIS rubber molecular chain meet the requirements.
2. Prevent oxygen from entering the reaction system, so as to avoid the initiator reacting with oxygen and affecting the polymerization effect.
3. In the post-treatment process, make sure the solvent is completely removed so as not to affect the performance of SIS rubber.
4. Quality control
In order to ensure the stable quality of SIS rubber, it is necessary to carry out comprehensive monitoring of the production process, including the quality of raw materials, reaction conditions, molecular weight distribution, Menni viscosity and other key indicators. At the same time, it is also necessary to conduct performance tests on the finished products, such as tensile strength, tear strength, aging resistance, etc., to ensure that the products meet the relevant standards and customer requirements.
In short, the manufacture of SIS rubber requires strict control of raw material quality, reaction conditions and post-treatment processes to ensure stable product quality and performance. At the same time, it is also necessary to strengthen the monitoring and quality control of the production process to ensure that the products meet the relevant standards and customer requirements, and provide high-quality raw materials for the field of chemical production.
