Main characteristics of rubber vulcanization accelerators
Rubber vulcanizing agent manufacturers tell you that the activation temperature is low, the curing speed is fast, and the crosslinking degree is high. However, it is easy to burn, poor flatness, improper vulcanization operation, easy to cause insufficient sulfur or too much sulfur. It is suitable for fast vulcanizing thin products of butyl rubber and EPDM rubber, room temperature vulcanizing products, latex products and vulcanizing products. Among these accelerators, ammonium salt is more active, followed by sodium salt and potassium salt, which are water-soluble accelerators used for latex products.
Rubber vulcanizing agent manufacturers tell you that it includes mono vulcanizing thiuram, di vulcanizing thiuram and poly vulcanizing thiuram. It is an acidic accelerator with activity between dithiocarbamate and thiazole type accelerators. It is generally used as a di-accelerator to increase the cure rate and degree of cure of thiazole and thiosulfonamide type accelerators. Sulfur disulfides and polysulfides release reactive sulfur at standard curing temperatures and can be used as sulfur donors in sulfur-free curing systems. Guanidine accelerator is a widely used alkaline accelerator today. It is a medium speed gas pedal for natural and synthetic rubber. When used alone, guanidine accelerators provide a late start of vulcanization, high operational safety, and good storage stability of the compound, but the rate of vulcanization is slow (up to one time slower than sulfoxide accelerators). Guanidine accelerator vulcanizates are characterized by a high degree of vulcanization, resulting in high hardness and high elongation stress. However, due to the presence of a large number of polysulfide bonds and a large amount of cyclization in the vulcanized rubber, the vulcanized rubber is poorly resistant to heat aging, prone to cracking, and has a high compression set. In addition, this accelerator has discoloration and contamination and is not suitable for white products. Due to the slow curing speed and poor heat aging resistance, guanidine accelerator is usually not used alone, but as a thiazole and sulfoxide two accelerator. When used in combination, the activation effect is particularly strong. It is used in the production of rubber sheets, shoe soles, bicycle tires, industrial products, thick products and hard rubber products. Rubber compounds with guanidine as a di-accelerator are suitable for all curing methods. However, when it is used as an accelerator, it starts curing too late to be used for hot air curing.
Rubber vulcanizing agent manufacturers tell you that thiourea accelerators have low promotional effect, poor scorch resistance, and are rarely used in diene rubber. However, in some special cases, such as the use of sulfur donors such as disulfide thiuram or polysulfide as a vulcanizing agent, which has the function of an activator; thiourea promoter is almost a special promoter for neoprene rubber, which can produce vulcanized rubber with good tensile strength, constant tensile stress, compression deformation and other properties. This accelerator is obtained by condensation of aliphatic aldehydes with ammonia or amines (aliphatic or aromatic amines). It is a weak accelerator and its vulcanization activity varies according to the species. For example, butyraldehyde aniline condensate (Accelerator 808) is the stronger accelerator in this category. It has good vulcanization flatness and good aging resistance. In addition to its use as a di-accelerator for other accelerators (e.g., dithiocarbamates, thiuram, thiazole), it is commonly used in thick-walled products. Except for accelerator H which can be used for light-colored and transparent products, most of them are polluting or photochromic and are not suitable for light-colored rubbers.
Environmental protection. Avoid workshop dust pollution, protect workers' health.
Rubber additives are chemicals that bring high added value to rubber products and can reduce costs. However, the traditional rubber additives not only produce a lot of dust and toxic and harmful gases when used,
A rubber vulcanizing agent is a substance that induces a vulcanizing reaction in rubber. Vulcanization is the process by which rubber undergoes a chemical reaction to form a cross-linked structure, increasing elasticity and wear resistance. In industrial production, rubber vulcanizing agent is widely used in automobile tires, rubber hoses, flooring, cables and other fields.
Rubber vulcanizing agent manufacturers tell you that the activation temperature is low, the curing speed is fast, and the crosslinking degree is high. However, it is easy to burn, poor flatness, improper vulcanization operation, easy to cause insufficient sulfur or too much sulfur. It is suitable for fast vulcanizing thin products of butyl rubber and EPDM rubber, room temperature vulcanizing products, latex products and vulcanizing products.
Rubber vulcanizing agent is a substance that enables natural rubber and synthetic rubber to cross-link at high temperatures, thus improving rubber properties. Rubber vulcanizing agent has the following advantages:
At first glance, vulcanizing agents appear to be chemicals used in our industrial production or in certain specific situations, but we should never underestimate the role and use of our vulcanizing agents.