LANXESS BUTYL 402
butyl rubber
CAS: 9010-85-9
Molecular Formula: C9H16
LANXESS BUTYL 402 - Names and Identifiers
LANXESS BUTYL 402 - Physico-chemical Properties
| Molecular Formula | C9H16 |
| Molar Mass | 124.23 |
| Physical and Chemical Properties | A copolymer of isobutylene (97%) and isoprene (3%). White to light gray. Odorless and tasteless. Relative density 0.92. The glass transition temperature is -67 ~-69 ℃, insoluble in ethanol and acetone. |
LANXESS BUTYL 402 - Risk and Safety
| Risk Codes | 10 - Flammable |
| Safety Description | 16 - Keep away from sources of ignition. |
LANXESS BUTYL 402 - References
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | butyl rubber (IIR) is the fourth largest synthetic rubber (SR) in the world. it is the product of cationic polymerization of isobutylene and isoprene under the action of Friedel-Craft catalyst. it is white or light yellow crystal in appearance, odorless and tasteless, with very low glass transition temperature and insoluble in ethanol and acetone. |
| Preparation | Butyl rubber can be prepared by polymerizing isobutylene and isoprene under a catalyst (aluminum trichloride) and low temperature (-98°C). |
| physical properties | butyl rubber is a linear polymer formed by copolymerization of isobutylene and isoprene, and then vulcanized and cross-linked to form a network structure. Among them, isoprene content is generally 1.5%~ 4.5%, white or light gray, odorless and tasteless. Density 0.91g/cm3, glass transition temperature -67 ~-69 ℃. Insoluble in ethanol and acetone, resistance to animal and plant oil, oxygen and ozone resistance, acid and alkali resistance, cold resistance, air tightness and electrical insulation are good, tensile strength and elongation are also high. |
| performance | the highly saturated structure of butyl rubber molecular chain makes it have high ozone resistance and weathering resistance, as well as high chemical stability, acid resistance, alkali resistance and redox resistance. The molecular chain of butyl rubber is mainly composed of carbon-carbon single bonds. The number of polarizable double bonds is very small, the substituent is symmetrical, non-polar, and the degree of unsaturation is extremely low. It is a typical non-polar rubber. Therefore, butyl rubber has better electrical insulation and corona resistance than general synthetic rubber. |
| Rubber properties | Butyl rubber has good air tightness. The diffusion speed of gas through the polymer is related to the thermal movement of polymer molecules. The side methyl groups in the butyl rubber molecular chain are densely arranged, which limits the thermal movement of polymer molecules, so the air permeability is low and the air tightness is good. Butyl rubber has good thermal stability, butyl rubber vulcanized rubber has excellent heat stability, sulfur vulcanized butyl rubber can be used in the air for a long time at 100 ℃ or a slightly lower temperature, and the use temperature of butyl rubber vulcanized with resin can reach 150 ℃ ~ 200 ℃. The thermal oxygen aging of butyl rubber is a degradation type, and the aging trend is softening. Butyl rubber has good ozone resistance and weather aging resistance. The high saturation of butyl rubber molecular chain makes it have high ozone resistance and weather aging resistance. Ozone resistance is about better than natural rubber and styrene butadiene rubber. 10 times. Butyl rubber has energy absorption (shock absorption performance), butyl rubber lacks double bonds in the molecular structure, and the side chain methyl distribution density is relatively large, so it has good characteristics of absorbing vibration and impact energy. In a wide temperature range (-30 ~-50 ℃), the rebound characteristics of butyl rubber are not more than 20%, which shows that the ability of butyl rubber to absorb mechanical properties is better than other rubbers, the damping properties of butyl rubber at high deformation speeds are inherent to the polyisobutylene segment, and to a large extent, it is not affected by the use temperature, unsaturation level, vulcanization state and formulation changes. |
| stability | butyl rubber has good chemical stability. the highly saturated structure of butyl rubber makes it have high chemical stability. Butyl rubber is particularly resistant to animal and vegetable oils, and has good corrosion resistance to most inorganic and organic acids. Although it is not resistant to concentrated oxidizing acids, such as nitric acid and sulfuric acid, it is resistant to non-oxidizing acids and medium concentrations of oxidizing acids. And alkali solution and redox solution. After soaking in 70% sulfuric acid for 13 weeks, the strength and elongation of butyl rubber have almost no loss, while the properties of natural rubber and styrene-butadiene rubber have been seriously reduced. |
| Application | Butyl rubber (IIR for short) is a synthetic rubber formed by cationic polymerization of isobutylene and isoprene under the action of a Friedel-Craft catalyst. It has excellent air tightness and good heat resistance, aging resistance, ozone resistance, solvent resistance, electrical insulation, shock absorption and low water absorption, it has been widely used in inner tubes, vulcanized capsules, airtight layers, sidewalls, wires and cables, waterproof building materials, shock-absorbing materials, medicinal bottle stoppers, food (chewing gum base), rubber dams, anti-virus appliances, adhesives, inner tube doors, anti-corrosion products, dock ship fenders, bridge support pads and heat-resistant transport belts. |
| toxicity | can be safely used in food (FDA, 172.615,2000). |
| use limit | GB 2760-1996:GMP is limited. |
| use | gum base. |
| Production method | It is made of isobutylene and isoprene in methyl chloride solution, using aluminum chloride as a catalyst, at a temperature below -95 ℃ Copolymerized. After polymerization, rubber particles are refined with hot water containing food-grade depolymerizing agents (such as stearic acid), and finally dried to remove residual volatiles. |
Last Update：2024-04-09 21:01:54
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Product Name: butyl rubber Request for quotationCAS: 9010-85-9
Tel: +86-17551318830
Email: r@reformchem.com
Mobile: +86-17551318830
QQ: 3785839865
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