Butyl reclaimed rubber and butyl rubber are used together to produce high-airtight rubber products such as automobile and motorcycle inner tubes, tire innerliners, vulcanized capsules, etc., heat-resistant rubber products such as heat-resistant rubber sheets, heat-resistant conveyor belts, and corrosion-resistant products such as anti-corrosion linings, etc., which can effectively reduce the cost of raw materials under the premise of ensuring product quality. Compared with butyl reclaimed rubber, butyl rubber is more difficult to mix, and the following problems are prone to occur during mixing.
1. Molecular structure and mixing characteristics of butyl rubber
Butyl rubber is made of isobutylene copolymerization with a small amount of isoprene, which is a rubber with high saturation, which does not contain double bonds in its molecular structure, and has good aging resistance and chemical corrosion resistance E4LYY711. The cold flow of butyl rubber is large, and it is difficult to disperse the compounding agent, so special attention needs to be paid to the control of process parameters when mixing butyl rubber. The commonly used mixing methods for butyl rubber include primer method and thin pass method, which can promote the uniform dispersion of compounding agent and improve the mixing uniformity of rubber compound.
2. Common problems of butyl rubber compounding
(1) In the process of butyl rubber mixing, it is easy to have the phenomenon of detachment, sticking roll and crushing of high-filling rubber material
The butyl rubber mixing and derolling can be solved by appropriately reducing the roll temperature, and the sticking roller phenomenon can be solved by raising the temperature or adding the derolling agent (such as zinc stearate, low molecular weight polyethylene, etc.); For the crushing phenomenon of highly filled compounds, it can be dealt with by increasing the filling capacity or by using the reverse mixing method. It should be noted that the saturation of butyl rubber is high, and other raw rubber cannot be mixed during mixing, so as not to affect the quality of the rubber material, and the machine must be thoroughly cleaned before mixing.
(2) Butyl rubber is vulcanized in advance
Butyl rubber may be vulcanized in advance during the mixing process due to high local temperature or high accelerator dosage. Strictly control the mixing temperature, and reasonably select and reduce the amount of accelerator added, it is recommended to choose a slow temperature change accelerator to reduce heat accumulation and prevent early vulcanization.
(3) Butyl rubber mixing is uneven
Improper setting of mixing parameters or improper use of equipment can easily cause poor dispersion of fillers in butyl rubber, resulting in different physical properties. Adjust the temperature and speed of the mixer appropriately, and regularly check the screw and rotor of the mixer to avoid operation errors caused by wear. Adjust the heating rate during the mixing process and control the addition rate of the powdered filler so that it is evenly dispersed in the base.
(4) Butyl rubber has poor surface finish
The uneven distribution of fillers and the unreasonable selection of plasticizers during butyl rubber mixing are prone to the problem of rough and uneven surface of the mixed products. The use of highly dispersed fillers, such as highly dispersed silica, ensures that the plasticizer is completely absorbed during the compounding process.
The mixing of butyl rubber is a complex process, which requires strict control of process parameters and the addition ratio of compounding agent, effectively solving the common problems in the mixing process, and improving the performance and quality of the rubber compound. When butyl reclaimed rubber and butyl rubber are used together to produce rubber products, the uniform mixing of rubber is the basis for ensuring the quality of the finished product, and we have the opportunity to continue to discuss the mixing characteristics and key points of butyl rubber/butyl reclaimed rubber with you.
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