Introduction to Butyl Rubber, Main Applications of Butyl Rubber

Butyl rubber is a synthetic rubber copolymerized by isobutylene and a small amount of isoprene. Seven general-purpose synthetic rubbers (butadiene rubber). Styrene-butadiene rubber. Nitrile rubber. Neoprene rubber. Ethylene-propylene rubber. Butyl rubber. One of the pentyl rubber), the English name ButylRubber, referred to as IIR (IsobutyleneIsopreneRubber abbreviation). White to light gray, no odor; insoluble in ethanol and ether. Viscosity average molecular weight=(35-45)×l Relative density (1704)℃/4℃)0.92.(27℃/4℃)0.91, refractive index 1.5078～1.508l, glass transition temperature -69℃, specific heat capacity 1.94kJ /(kg•K), thermal conductivity 0.091W/(m.K). The isoprene segment only accounts for 0.6%~3.0% of the main chain. Therefore, the degree of saturation of the butyl rubber chain is very high.

The types of butyl rubber are divided into 5 grades according to the degree of unsaturation, and the degree of unsaturation is 0.6%-1.0%.1.1%~1.5%.1.6%~2.0%. .2.1%-2.5%. 2.6%~33%. The grades can be divided into several brands according to their Mooney viscosity and whether or not the anti-aging agent used is contaminated or contaminated.

1. Butyl rubber has good air tightness. The diffusion rate of the polymer is related to the thermal motion of the polymer molecules. The dense arrangement of methyl groups in the middle of the molecular chain of butyl rubber restricts the thermal movement of polymer molecules, resulting in low air permeability and good air tightness.

2. Butyl rubber has good thermal stability, and butyl rubber vulcanizate has good thermal stability. The vulcanized butyl rubber can reach 100℃ or used in the air for a long time, and the temperature of butyl rubber vulcanized with resin can reach 150℃～200℃. The thermo-oxidative aging of butyl rubber is degradable, and tends to soften with aging.

3. Butyl rubber has good ozone resistance and weathering resistance. The high saturation of butyl rubber molecular chain makes it have higher ozone resistance and weathering resistance, which is about 10 times better than natural rubber.

The main application of butyl rubber is in the manufacture of tire innerliners and tire inner tubes. As a halogenated butyl rubber in the tire industry, butyl rubber is used as an inner liner for automobile, truck, bus and aircraft tires, accounting for 84.6% of the total consumption of butyl rubber in my country.

Butylation of medical bottle stoppers is the second largest demand market for butyl rubber in my country. At present, butyl rubber used in medicinal rubber stoppers in my country accounts for 10.5% of the total consumption.

Butyl waterproof tape is a life-long non-curing self-adhesive waterproof sealing tape, which uses butyl rubber as the main raw material, with other additives. It has strong adhesion and excellent weather resistance, aging resistance and water resistance to the surface of various materials, sealing the surface of the adherend, shock absorption, protection and other functions. The product is completely solvent-free and therefore does not shrink. Does not emit toxic fumes. Because it does not cure for life, it is a very advanced waterproof sealing material.