Pvb resin manufacturers of the small editor today to take you to know about the advantages and disadvantages of butyl rubber about the relevant introduction, butyl rubber is a kind of synthetic rubber made of isobutylene and a small amount of isoprene, the finished product is not easy to leak, it is usually used to manufacture automobile and aircraft wheel inner tubes, butyl rubber is a copolymer of isobutylene and isoprene, put into industrial production in 1943. The biggest advantage of butyl rubber is: good airtightness. It can also have heat resistance, ozone resistance, aging resistance, chemical resistance as well as shock absorption, electrical insulation properties. The types of butyl rubber are divided into 5 grades according to unsaturation, which are 0.6-1.0%, 1.1%?1.5%, 1.6%?2.0%, 2.1%-2.5%, and 2.6%-33%. Within each grade, there are also grades based on The Mooney viscosity and the degree of contamination or degree of contamination of the anti-aging agents used.
Since butyl rubber is non-polar, and the typical water absorption is very small (at room temperature, the water absorption rate is 1 / 10-1 / 15 of other rubber), the electrical insulation characteristics and corona resistance are better than the general synthetic rubber, the dielectric constant is only 2.1 resistivity, and the resistivity is as high as 1016Ω * m or more, which is about 10 to 100 times that of ordinary rubber.
Butyl rubber has good hardiness because it is not easy to crystallize at low temperatures due to the structural characteristics of molecular chains with the same cycle length. The vitrification temperature of rubber is only higher than that of natural rubber, isoprene rubber, butadiene rubber and eppropylene rubber, and it is still soft at -50 ° C. There is a large resistance in the molecular chain, so under the action of alternating stress, the amplitude attenuation is faster, and the performance of absorbing shock or vibration is good, and the vibration attenuation can be maintained in the range of -30 ~150 °C. Because butyl rubber is crystallized in the tensile state, it has high tensile strength and elongation at break. This means that the rubber has good strength without the use of carbon black for reinforcement, so it can be used to manufacture light-colored products.
The disadvantages of butyl rubber are: slow vulcanization rate (need to match with super accelerators and have high temperature and long curing time), poor processability (especially due to poor adhesion and mutual adhesion, often relying on adhesives or layers can ensure that they bond to each other) Other, and the bond strength is not very high), low gentle toughness, large *** deformation, hysteresis loss, high dynamic heating and poor oil resistance. In addition to epDM rubber, butyl rubber has poor compatibility with other rubbers and is difficult to use.
Pvb resin manufacturer's small editor today to introduce you to here, have questions can be consulted Oh!
Article Source: https://www.tanyunpvb.cn/
![The first set of PDD process in China, with obvious performance advantages The polybrominated butyl rubber project in Jingbo is about to be put into production[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)