Vulcanization system nitrile butadiene rubber mainly uses sulfur and sulfur-containing compounds as curing agents, but also can be vulcanized with peroxide or resin. As most nitrile-butadiene rubber products require small compression permanent deformation, low-sulfur and sulfur-containing compounds are often used, and sulfur-containing compounds (sulfur-free vulcanization system) or peroxides are used as curing agents. Sulfur accelerator system is the most widely used curing system of nitrile butadiene rubber. Sulfur can be used either sulfur powder or insoluble sulfur. As the solubility of sulfur in nitrile-butadiene rubber is lower than that of natural rubber, attention should be paid to controlling the amount of sulfur. With the increase of the amount of sulfur, the tensile stress and hardness increased, and the heat resistance decreased, but the oil resistance increased slightly and the cold resistance changed little. General soft rubber because the unsaturation of nitrile butadiene rubber is lower than that of natural rubber, the amount of sulfur needed can be less, generally 1.5 phr, vulcanization accelerator can be slightly more than natural rubber, commonly used 1 phr 3.5 phr. The optimum amount of sulfur for soft vulcanizate of nitrile rubber is about 1.5 phr. The amount of sulfur required for nitrile-butadiene rubber with different acrylonitrile content is not the same. When the content of acrylonitrile is high and the relative content of butadiene is low, the amount of sulfur required can be reduced due to the reduction of unsaturation. For example, butyronitrile-18, sulfur 1.75 phr, butyronitrile-26, 1.5 phr and 1.75 phr, have good comprehensive properties. The combination of low sulfur can improve the heat resistance of vulcanizate, reduce the compression permanent deformation and improve other properties, so nitrile butadiene rubber often adopts low sulfur (less than 0.5 phr of sulfur) and high accelerating curing system.
In the process of rubber mixing, the dispersion of fillers and compounding agents has an important influence on the properties of the final rubber products. In order to achieve the best dispersion and product quality, the following optimization measures are available:
Rubber processing aids (RPA) are a set of products designed to help manufacturers with increasing quality, efficiency, and safety of their rubber production process. RPA have become increasingly important in recent years as manufacturers strive to improve their production standards.
Export vulcanized shoes are most afraid of three problems: frosting on the outsole, migration of straps and mildew of materials; these three problems are the hardest-hit areas of foreign trade order claims and product removal in history, precisely because of the concealment of these three problems. it is often impossible to see substantial changes in a short period of time, but the high temperature and high pressure in the shipping process of containers begin to show up when they reach foreign customers after ten days and a half months of transportation.
The Power of Processing Aids for Harnessing Rubber Rubber has been a versatile and useful material for centuries, and today it is used in countless different applications. It is durable, resistant to weathering, and able to absorb vibration. But in
Audience: Expert Many production processes involve the use of rubber processing aids to assist in the manufacture of rubber materials. By unlocking the many benefits of rubber processing aids, manufacturers can produce higher-grade rubber products that meet their customers' needs
Polymer materials, because of their excellent properties such as light weight, high strength, temperature resistance and corrosion resistance, are now widely used in many fields, such as high-end manufacturing, electronic information, transportation, building energy saving, aerospace, national defense and military industry. Played a huge role.
It is not only an important basic industry of the national economy, but also a national leading industry.
Polymer materials have always been a development field that developed countries and multinational corporations attach great importance to.
This not only provides a broad market space for the polymer new material industry, but also puts forward higher requirements for its quality performance, reliability level, guarantee ability and so on, and aging is an important factor affecting the reliability and durability of polymer materials.
Processing aids – such as polymers, resins and fatty acids – have been gaining traction lately as a way to add new life and durability to rubber products. But what are these unique processing aid options, and how can they
Processing can be a headache-inducing and time consuming task. Thankfully, today, there is an efficient and cost-effective solution: rubber aides. Let's look at why and how rubber aides can help ease processing headaches. What are Rubber Aides? Rubber aides are
It should be noted that to improve the tensile strength of rubber, appropriate methods need to be selected according to the specific conditions, and experimental verification should be carried out. At the same time, other performance indicators such as aging resistance and medium resistance need to be considered to ensure that the quality of the final product meets the requirements.