Most of the medical rubber products are made of natural rubber, butyl rubber and silica gel. The performance requirements of rubber raw materials are very strict. Latex reclaimed rubber, butyl reclaimed rubber and isoprene reclaimed rubber in reclaimed rubber can also be used in the production of medical rubber products. When using recycled rubber to produce medical rubber products, the choice of various compounding agents in the formulation has a great influence on whether the medical rubber products meet the requirements of non-toxic, odorless and non-radiative.
- Selection of compounding agent in vulcanization system of medical reclaimed rubber products.
Sulfur is currently the most commonly used vulcanizing agent in the rubber products industry, but sulfur with low purity will contain trace harmful substances, such as arsenic. Therefore, sulfur must be selected in the production of medical reclaimed rubber products to avoid the toxicity of rubber products produced. Sulfur itself is a substance that is irritating to the skin. Medical reclaimed rubber products need to strictly control the amount of sulfur. The use of metal oxides as vulcanizing agents for medical reclaimed rubber products (such as the use of magnesium oxide in butyl reclaimed rubber stoppers) requires the selection of high-purity magnesium oxide. Magnesium oxide with low purity contains metal ions such as cadmium and lead, which leads to the failure of medical reclaimed rubber products to meet the production requirements, and the amount of magnesium oxide is controlled to about 2-3 parts.
The accelerator in the vulcanized system of medical reclaimed rubber products needs to meet the non-toxicity and inertness, and the less the amount, the better, avoiding side effects.