Butyl Rubber Encyclopedia

How to further improve the ozone resistance of butyl reclaimed rubber products 1

Create Date:2019-04-09 08:44:55Click volume:301
How to further improve the ozone resistance of butyl reclaimed rubber products 1

Butyl rubber is a high-saturation rubber synthesized from isobutylene and a small amount of isoprene, and has good ozone resistance. Most of the butyl reclaimed rubber is a renewable resource processed from waste butyl inner tube, which retains the ozone resistance of butyl rubber. However, in some special applications, the ozone resistance of butyl reclaimed rubber itself cannot meet the demand of products. advanced optimization. So what are the factors that affect the ozone resistance of butyl reclaimed rubber, how to improve the ozone resistance of butyl reclaimed rubber products.

Theoretically, there are two main reasons for the ozone resistance of butyl reclaimed rubber. One is the unsaturation of butyl reclaimed rubber, and the other is the selection of various coordination systems in the formulation of butyl reclaimed rubber products.

1. What kind of butyl reclaimed rubber is better for ozone resistance?

The ozone resistance of butyl reclaimed rubber is directly related to the high unsaturation of the butyl rubber itself. The lower the degree of unsaturation, the better the ozone resistance of the butyl reclaimed rubber. In general, the higher the molecular weight structure of the butyl reclaimed rubber and the butyl rubber, the higher the degree of saturation, and the better the ozone resistance of the butyl reclaimed rubber. When butyl reclaimed rubber is used to produce a reclaimed rubber product which is particularly resistant to ozone resistance, a high-gum content butyl reclaimed rubber is selected as much as possible while meeting the cost requirement.

2. How to improve the ozone resistance of the rubber compound by optimizing the formula of butyl reclaimed rubber products

The compounding system in the formulation of recycled rubber products mainly includes vulcanization system, reinforcing filling system, softening system and anti-aging system. The vulcanization system, reinforcing filling system and softening system have great influence on the ozone resistance of butyl reclaimed rubber products. The anti-aging system can improve the ozone resistance of butyl reclaimed rubber products in the most direct way.

(1) Effect of vulcanization system on ozone resistance of butyl reclaimed rubber products

Generally, the butyl reclaimed rubber compound vulcanized by the conventional sulfur vulcanization system not only has good mechanical strength and wear resistance, but also can obtain better ozone resistance. When the amount of sulfur is 2 or more, the butyl rubber can be used. Obtain better ozone resistance; however, in the actual processing process, the increase of sulfur dosage will not only affect the vulcanization rate of the rubber compound, but also prone to blooming problems, so the sulfur dosage needs to be reasonably controlled.

The amount of sulfur and accelerator in the vulcanization system will also affect the degree of vulcanization of the rubber compound. When the butyl reclaimed rubber is under sulfur or sulfur, the ozone resistance of the rubber compound will also be deteriorated. Therefore, it is necessary to adjust the coordination in the vulcanization system. The type and amount of the agent and the vulcanization conditions of the butyl reclaimed rubber product can improve the degree of vulcanization of the reclaimed rubber, and avoid the phenomenon that the ozone resistance of the rubber compound is reduced due to insufficient sulfur and sulfur.