Industrial uses of polyisobutylene (1) Adhesives (including pressure-sensitive adhesives) Polyisobutylene is mixed with a variety of high molecular weight substances, such as: natural rubber; synthetic rubber; high molecular weight polyethylene Isobutylene, petroleum; non-toxic and highly transparent, used for pasting trademarks on items. Due to the properties of polyisobutylene, this raw material is also widely used in the field of automobiles and refrigerator waterproof sealants. Pressure-sensitive adhesive with synthetic rubber matrix: polyisobutylene is commonly used as the main component. For example, transparent pressure-sensitive tape is a mixture of polyisobutylene elastomer polymer and semi-liquid in a certain proportion and then applied to a transparent substrate. Sealing putty formula polyisobutylene 38.5 Liquid polyisobutylene 61.5 Liquid paraffin 38 Rosin 10 Zinc oxide 54 Asbestos wool 50 Chromium trioxide 10 This formula is mainly used for sealing metal bonding gaps and other joints. Shear strength 49KPa. It has a long storage period and will not deteriorate after one year of storage. High molecular weight polyisobutylene and polyethylene are mixed together for cable coating, and can also be used in waterproof tape, waterproof stone, wax paper and hot melt adhesive. (2) Electronic insulation: When polyisobutylene is mixed with natural rubber and synthetic rubber (butyl rubber; SBR), it has good waterproof and high-strength breathability properties. Because of its anti-aging and anti-oxidation properties, polyisobutylene It is also used in insulating tapes and anti-corrosion tapes for wires and communication cables. Sticky Impregnated Paper Insulated Power Cable The impregnating agent has a high viscosity and is not easy to flow within the cable operating temperature range, but has a lower viscosity at the impregnating temperature to ensure good impregnation. Viscous impregnating agent Many countries use a mixture of polyisobutylene and bright oil to form a low-voltage cable impregnating agent (bright oil accounts for about 65 to 70%, polyisobutylene accounts for about 30 to 35%). Because of its excellent insulation properties, it is used as a cable sleeve/joint with a high breakdown voltage. In order to improve the moisture resistance and stability of communication cables, comprehensive cable sheaths are widely used in local telephone cables. Alpeth: A layer of polyethylene sheath is extruded outside the cable core, and then wrapped longitudinally with a 0.2 mm corrugated aluminum tape, filled with polyisobutylene insulation compound, and then coated with a thermoplastic adhesive layer, and a layer of polyethylene is extruded on the outermost layer. jacket. (3) In paraffin wax and its modified products (Micro-crystallinewax) and petroleum wax, polyisobutylene is sometimes added to improve the toughness and adhesion of the wax. When polyisobutylene is mixed with paraffin wax or microcrystalline wax, it will increase the tensile strength and improve the crispness of the product under low temperature and moisture conditions. It is especially used for the packaging of frozen foods. It has high softness and resistance. acidic. (4) In terms of waterproof materials, it can be made into elastic tireless waterproof membranes, waterproof films, waterproof coatings, coating materials, and sealing materials such as ointment, cement, and waterstops. These products have the characteristics of high tensile strength, high elasticity and elongation, good adhesion, water resistance and weather resistance. They can be used cold and have a long service life. It can also be used for the waterproof layer in the middle of composite lining (tunnel lining with inner and outer layers constructed one after another). If polyisobutylene is mixed with asphalt adhesives, waterproofing agents, engineering sealants and electronic insulation products, the stretchability and cold resistance of the products will be greatly changed. It can improve the heat resistance, load resistance, anti-skid and anti-cracking properties of asphalt pavement. When used in roof coatings, the use of polyisobutylene will increase the low weather resistance and low-temperature performance of the product, and will also greatly change the roof sealing layer reference formula: 50% carbon black + 8-10% polyethylene/polyvinyl chloride + 20 -30% B150 (5) viscosity index improver is also called tackifier. It is used to increase the viscosity of oil and improve the viscosity-temperature characteristics to adapt to the requirements of oil viscosity in a wide temperature range. Mainly used for blending multi-grade internal combustion engine oil, automatic transmission oil and low-temperature hydraulic oil. (6) Sealant polyisobutylene has excellent atmospheric resistance, aging resistance and durability, and also has low moisture vapor permeability and does not produce smoke. It is very suitable for sealants of insulating glass, double-glazed doors, etc. Barrier sealant for windows. Polyisobutylene, carbon black, antioxidants and ultraviolet absorbers are used in the production of insulating glass sealants to increase the flexibility and permeability of the product. Since the country attaches great importance to environmental protection in the production of insulating glass in China, therefore, In this application, the amount of polyisobutylene will gradually increase.

(7) The good weather resistance of the adhesive tape > NR, viscous Acrylic, and low polarity Acrylic/rubber make it widely used in the adhesive industry. Self-adhesive insulation tapes can be medium/high molecular weight, cableinsulation, underground pipeline against corrosion, ordinary adhesive tapes Hotmelt adhesives often contain low, medium and high MW PIB, mainly content arelow and high MW PIB (8) film is used together with graphite as a conductive film; together with barium ferrite, it is used as a magnetic film for thin films Medium, can be compatible with fillers such as carbon black, graphite, chalk, shale, quartz, clay and talc; has great plasticity; good water and weather resistance. Car protective film: for the protection of complete vehicles, parts and production processes, it can be mixed with PE and PP to absorb filler in large quantity, adding EVA polymer, PP, HDPE, LDPE and LLDPE can improve its physical strength (9) Polymer drag reducing agent After adding polymer drag reducing agent to the fire hose, use diameter Smaller water belts can still maintain the same flow of water and are easy for firefighters to carry; adding drag reducing agents to farmland irrigation can improve irrigation efficiency and expand irrigation area; adding drag reducing agents to water and oil transportation systems It can save energy consumption; in flood discharge pipelines, using drag reducing agents when flood peaks occur can also improve flood discharge efficiency; in oil well drilling, adding polymer drag reducing agents to the injection water can greatly increase the injection rate. (10) Application in explosives Plastic explosives are made of explosives, binders, and plasticizers. It is characterized by good plasticity and can be made into various shapes. Polyisobutylene is usually used as the binder and dioctyl sebacate as the plasticizer, and is widely manufactured by the suspension method. Flexible explosives are characterized by a certain degree of elasticity, toughness and flexibility. It can be folded, bent, has good water resistance, looks like rubber, leather or soft plastic products, and can be made into shapes such as ropes, plates, films, strips, tubes and tapered holes. Mainly used in some special explosion situations and devices. Such as underwater cutting, aerospace, metal explosion processing, etc. The pyrotechnic powder is a polyisobutylene-thickened triethylaluminum combustion agent with magnesium and magnesium alloy as the main components. Triethylaluminum is a self-igniting substance with a combustion temperature of up to 2300°C. It is usually thickened with polyisobutylene and used as a combustion agent. (11) Surface processing of printed matter Surface processing is to appropriately treat the surface of printed matter to increase the gloss of the printed matter, or to increase the light resistance, heat resistance, water resistance, abrasion resistance, etc. of the printed matter, thereby protecting the printed matter. Hot-melt composite method Hot-melt composite method uses modified waxes such as polyisobutylene, heats them into a solution state, and coats them on the film substrate. The second substrate is directly attached to it, and then cooled with a cooling roller. And compound. This method does not require a drying process after applying the adhesive, and the installation is simpler than the dry lamination method. It is suitable for lamination of aluminum foil/paper, plastic/plastic, and plastic/lead foil. (12) Polymer gas sensor When polymer gas-sensitive materials encounter specific gases, their physical properties such as resistance, dielectric constant, material surface acoustic wave propagation speed and frequency, and material weight change. Polymer gas-sensitive materials play an important role in the detection of toxic gases and food freshness due to their easy operability, simple process, good room temperature selectivity, low price, and easy combination with microstructure sensors and surface acoustic wave devices. . Polymer gas sensors have high sensitivity to specific gas molecules, good selectivity, and simple structure. They can be used at room temperature and can supplement the shortcomings of other gas sensors. (13) The common flexographic plate making method in corrugated printing is molded rubber relief: it is made by heating and pressurizing natural rubber or synthetic rubber materials in the master mold. The advantage of the molded rubber relief plate is that once the master is made, it is easy to produce rubber replica plates, the plate thickness can be freely controlled, and a variety of rubber plates can be produced according to different ink substrates, such as polyisobutylene rubber plates. (14) Special uses 1. Due to its high viscosity, waterproofness, and tear resistance, this raw material is also widely used in industrial construction. For example, to prevent the violent shaking of buildings during earthquakes, this material is also used to reduce the vibration of highway viaducts.

2. Protective film is used as a protective film on the top of the car to prevent acid rain; polyisobutylene and pressure-sensitive adhesive added with polyolefin resin are used together to further increase the waterproofing and post-processing properties. 3. Infrared light hollow fiber sensing: hollow fiber optics coated with polyisobutylene, solid fiber detector: ATR crystal with polyisobutylene as solid phase microextraction coating layer. 4. As an additive, coated on the surface of natural rubber and synthetic rubber to play a protective role. 5. Improve the mechanical strength of hard rubber. 6. Treat waste, metal residues, toxic sludge, oil leakage. 7. Recycle plastics. 8. Used to recycle vulcanized rubber. Regeneration 9. Mixed with other polymers, it can be made into - sterile tubes for medical suction equipment and medical measurement equipment - dipping tubes - car protective films - decorative films, such as laminated films containing textile fibers - household films - once Sealing of sexual syringes - anti-slip food/feed/cardboard packaging film - outer film of yogurt cups, etc. - cosmetic packaging - packaging film of plastic bottle caps - anti-slip table mat - vacuum cleaner protective plate Food and medical purposes (15) Chewing gum poly Isobutylene is mixed with paraffin wax and resin to improve the quality of chewing gum; at the same time, it makes chewing gum softer and more stable, maintains good hydrophobicity, and has excellent film properties. (16) Food-grade adhesive polyisobutylene can be mixed with various cross-adhesive agents (including pressure-sensitive adhesives) to mainly play the role of bonding and modification. Polyisobutylene is hydrophobic and mixed with hydrophilic substances (CMC; pectin; gel) to maintain low toxic absorption and high temperature stability, adjust hardness, and have antibacterial properties. (17) Food packaging polyisobutylene is mixed with various paraffin waxes and polymers and used as a release agent for packaging films. For example, polyisobutylene, paraffin wax, and polymers are used in cheese packaging films. Polyisobutylene can improve the low-temperature stability of the product and improve water resistance. (18) Food-grade hot melt adhesive polyisobutylene has a plasticizing effect and is used in thermoplastic rubber (TPR), etc. (19) Food additive gum base material, also known as gum base, is a type of polymer compound. After adding polyisobutylene, it has appropriate viscoelasticity, chewiness resistance, smoothness, etc., and is used to manufacture gums. (20) Application in microcapsule technology Since the condensed phase separation technology of ethyl fiber from organic solvents does not require complex operations and expensive production equipment, there have been many studies in this area, some of which are prepared with ethyl cellulose. of microcapsules are already on the market. SueinssonSJ et al. prepared naproxen microcapsules using EC and polyisobutylene by condensed phase separation method. They heated polyisobutylene and dissolved it in 300 ml of cyclohexane. EC was added to the hot solution (50°C) under stirring at 400 or 700 rpm to disperse naproxen in the encapsulating polymer, and the temperature was maintained at 80°C for 1 hour. , then gradually lower the temperature to 45°C over 1 hour, and then quickly lower the temperature to 20°C to solidify the microcapsules, precipitate the microcapsules, pour off the supernatant, rinse three times with 200ml cold cyclohexane, and vacuum filter , dried at 50°C for 30 minutes. Under the electron microscope, it was observed that the prepared microcapsules had a multi-core structure, irregular shape, and the internal structure of the microcapsules was loose. Naproxen crystals wrapped with EC could be seen. As the concentration of polyisobutylene increases, the surface of the microcapsules gradually becomes smoother, but the shape becomes irregular. At this time, the dissolution rate of the drug gradually increases. (21) Storage-type (membrane-controlled) controlled-release preparation: scopolamine transdermal patch using microporous polypropylene as the controlled-release membrane and polyisobutylene as the drug reservoir (22) Transdermal drug delivery storage-type transdermal drug delivery system The adhesive layer is mostly polyisobutylene pressure-sensitive adhesive. Polyisobutylene is the main adhesive available for matrix-type transdermal drug delivery systems. Preparation of skeleton-type transdermal drug delivery system: Taking the estriol transdermal drug delivery system as an example, a "micro-reservoir controlled drug release system" with silicone rubber as the skeleton was prepared. Precisely weigh the estradiol and place it in a mortar, add an appropriate amount of PEG400 solution (a small amount of transdermal absorbent can be added if necessary), grind evenly, add a certain amount of polydimethylsiloxane, grind it into a thick gel, and place it Process under reduced pressure in a vacuum drying oven for 20 minutes to remove the air contained in the glue. Finally, add the cross-linking agent polyisobutylene pressure-sensitive adhesive and catalyst ethanol, mix well, pour into a stainless steel mold, and pressurize to shape. (23) Anti-slip food/feed/pallet packaging film LLDPE, 2-5%, cast/blown film, reduced gas transmission rate/anti-condensation performance