We know that the tread reclaimed rubber and natural rubber can be used together to ensure product quality and reduce raw material costs. For rubber products with lower performance requirements, we can also replace the natural rubber with the latex reclaimed rubber produced from waste natural latex gloves, which can reduce the cost more. Then the latex reclaimed rubber and the tread reclaimed rubber are used together to produce rubber products. What should I pay attention to?
1. Mixing temperature and time
The tread reclaimed rubber and the latex reclaimed rubber are all processed from waste rubber products. Although they have been vulcanized once during the processing, even after desulfurization, there are still residual cross-linking bonds in the rubber compound. The compatibility during processing is reduced, and it is impossible to form a roll of the sheet, which affects the speed and effect of the rubber feed. We can appropriately increase the mixing temperature, activate the residual cross-linking bonds, and improve the compatibility of the rubber compound. After the rubber material passes the roller, it can form a sheet-shaped wrapping roller, which is easier to eat.
The tread reclaimed rubber and the latex reclaimed rubber are used in the mixing process to affect the dispersion of carbon black in the rubber compound; whether the carbon black can be uniformly dispersed in the rubber compound affects the mechanical properties such as tensile strength and elongation at break of the rubber product. The key factor. If the carbon black is poorly dispersed in the rubber product, a large gel block is formed, which not only hinders the viscosity of the rubber compound, but also reduces the physical properties of the vulcanized rubber due to the lack of reinforcement of the carbon black. Although the reclaimed rubber itself contains a certain amount of carbon black, when processing rubber products, a certain amount of carbon black and other compounding agents are added to the rubber compound, which requires increasing the number of mixing times of the rubber compound and appropriately prolonging the mixing time. First, the particles in the original structure are uniformly dispersed, and the carbon black added later is more easily dispersed uniformly.
2. Carbon black dosage
When tread reclaimed rubber and latex reclaimed rubber are used together to produce rubber products, carbon black is a common auxiliary agent, which mainly plays a reinforcing role. With the increase of the amount of carbon black, the mechanical properties such as strength and hardness of rubber products are continuously improved, and the amount of carbon black is increased. The increase can reduce the concentration of vulcanizing agent and accelerator in the rubber compound, thereby slowing down the vulcanization speed, prolonging the scorch time and reducing the probability of scorching of the rubber product. In addition to reinforcing, carbon black is also present in the form of fillers in rubber products, increasing product volume and reducing production costs.
Although the performance of carbon black is good, it can not be added indefinitely. If the dosage is too much, the hardness of the product will be too large, the activity will be small, and the plasticity will be reduced. On the contrary, the vulcanization of the rubber will be affected, and the scorch time will be too long, which will affect the production efficiency. Therefore, the amount of carbon black must be controlled within a reasonable range, and the production efficiency is improved without affecting the production efficiency of the rubber paper product.
3. Parking time
When the tread reclaimed rubber and the latex reclaimed rubber are used together, the compound to be kneaded needs to be parked for a period of time to carry out the next process. The parking is a process in which the compounding agents in the rubber compound are dispersed and the concentration of each component is balanced. If the parking time is too short, the carbon black is not completely dispersed in the rubber, it can not play the reinforcing role, and the vulcanizing agent and the accelerator are not evenly dispersed, so that the vulcanized rubber has no uniform topography during the vulcanization process. The linkage will reduce the performance of the rubber compound or form a defect in the vulcanizate. Therefore, it is recommended to park for 16 hours in the middle, and the rubber compound can have better mechanical properties.
When the tread reclaimed rubber and latex reclaimed rubber are used together to produce rubber products, the choice of accelerator is also very important. It is recommended to choose the accelerator CZ, which is a post-effect accelerator, which can prolong the scorch time and improve the processing safety. In addition, what other processing techniques do you need to pay attention to?