Sticky rollers are a common problem in rubber processing. As a traditional rubber variety, natural rubber is widely used in the rubber products industry. In actual production, natural rubber has good mixing performance, good roll wrapping, good wetting of compounding agent, fast powdering, easy dispersion, short mixing time, and easy to master mixing operation. However, the problem of sticking rollers may also occur when natural rubber is mixed, especially rubber products with a hardness of less than 60; Pay attention to the following points to effectively avoid natural rubber mixing sticking rollers.
1. Reasonably control the amount of softener Use talcum powder in small amounts
When using natural rubber as the main raw material to produce rubber products, too much softener will lead to insufficient hardness of rubber compound, which in turn will lead to mixing sticky rollers; Appropriately reducing the amount of softener in the formula of natural rubber products, and adding a small amount of talcum powder to cover the surface of the roller if necessary, can effectively reduce the probability of mixing sticky rollers.
2. Choose the right mixing temperature
Each type of raw rubber has its own optimal mixing temperature during the compounding process. When natural rubber is mixed, the mixing temperature is not suitable, which can easily lead to the problem of mixing sticky rollers. Under normal circumstances, when natural rubber is mixed in the open mill, the roll temperature is generally controlled in the range of 50-60 °C, and the temperature of the front roller should be 5-10 °C higher than that of the rear roller, so as to facilitate the operation; When mixing with an internal mixer, a one-stage mixing method is mostly used. The heat generated by mixing is less than that of synthetic rubber, and the debinding temperature is generally controlled below 120°C.
3. Rubber mixing strictly controls the feeding sequence
In the process of natural rubber mixing, the feeding sequence has a great influence on the performance of the rubber compounding process. The addition of coumaron resin, pine tar and rosin may make the rubber tend to stick to the roller; When mixing natural rubber, pay attention to which compounding agent 2SLYY1225 is easy to stick to the roller, which is not easy to stick to the roller, and appropriately adjust the feeding sequence to reduce the sticky roller phenomenon. When natural rubber is used in combination with other rubber, a larger roller distance can be used for turning the rubber material with serious sticking rollers, so that it is easier to cut the knife and pick the glue. For the rubber material that is easy to roll off, it is best to use a smaller roller distance for refining and tamping.
4. Ensure the cleanliness of the rollers
When natural rubber is mixed, there are oil stains or impurities on the roller of the rubber mixer, and the rubber material is easy to get off the roll or stick to the roll, and the rubber material is prone to the problem of off the roll or sticking to the roll; Before mixing, the roller should be washed with rubber or scrubbed with alcohol, gasoline, etc., to avoid the rubber material from decoiling or sticking to the roller.
If there is a sticky roller problem when using natural rubber to produce various rubber products, corresponding solutions can be taken to solve the sticky roller problem caused by different reasons to ensure the smooth progress of the rubber mixing process. The price of natural rubber is high and the price fluctuates greatly, and many manufacturers have begun to use sub-brand natural rubber, natural latex reclaimed rubber, tire reclaimed rubber, etc. to replace some natural rubber; When natural rubber is combined with other rubber to produce rubber products, it is also necessary to properly adjust the mixing process parameters, and discuss related issues with you later.
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