Reclaimed rubber is a material obtained by recycling and reprocessing waste rubber products, which has important economic and environmental value in the rubber industry. When using reclaimed rubber to produce rubber products, the affinity of reclaimed rubber to hydrophilic compounding agent is often low, which limits its performance in some applications; Therefore, it is of great significance to improve the affinity among hydrophilic compounding agent and reclaimed rubber to optimize the performance of reclaimed rubber products.
1. Hydrophilicity and hydrophobicity of rubber compounding agent
Hydrophilic rubber additives usually contain polar functional groups such as hydroxyl, carboxyl or amino groups, which can form hydrogen bonds or other types of chemical bonds with the polar groups in the rubber, and are not easy to form a good affinity with reclaimed rubber due to their high surface energy; Common ones are carbonates, clays, zinc oxides, etc. Hydrophobic rubber compounding agents lack polar functional groups in their molecular structure and are not easy to form hydrogen bonds or other interactions with water, and their dispersion and compatibility in rubber are usually good, but they may not provide the same performance improvement as hydrophilic additives; Common ones are carbon black, sulfur, etc.
2. Methods to improve the hydrophilicity of the fit and the affinity of reclaimed rubber
Hydrophilic rubber additives such as zinc oxide and magnesium oxide have good chemical stability and reinforcing properties, and are widely used in reclaimed rubber products.
(1) Modify the surface of reclaimed rubber by chemical or physical methods to increase its hydrophilicity, so as to improve the compatibility with the hydrophilic compounding agent.
(2) Add surfactant. Surfactants are able to build a bridge among reclaimed rubber and hydrophilic compounding agents through the hydrophilic and hydrophobic parts of their molecular structure. The hydrophobic part has an affinity with the reclaimed rubber 2SLYY1123, while the hydrophilic part interacts with the compounding agent to improve the wettability and dispersion. In addition, the surfactant can also act as a stabilizer to prevent the re-aghesion of compounding agent particles and enhance the stability of the reclaimed rubber compound.
(3) Optimize the mixing process. Adjust the compounding process parameters of the reclaimed rubber, such as temperature, time and shear force, to promote the uniform dispersion of the hydrophilic compounding agent in the reclaimed rubber.
(4) Reasonable design formula. Balance the ratio of hydrophilic and hydrophobic additives to ensure optimal performance and compatibility.
The use of hydrophilic rubber compounding agent can improve the processing performance, vulcanization efficiency, physical properties and aging resistance of reclaimed rubber. Improve the affinity among the hydrophilic compounding agent and the reclaimed rubber, ensure the good dispersion and compatibility of the hydrophilic compounding agent in the reclaimed rubber, and optimize the performance of rubber products; This not only helps to improve the quality and durability of rubber products, but also helps to promote the sustainable development of reclaimed rubber in the rubber industry.
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