Special application of high molecular weight polyisobutylene (polyisobutylene rubber)

The use of polyisobutylene (1) industrial 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 polyisobutylene, petroleum; Non-toxic, high transparency, used to paste goods trademarks. Because of this property, polyisobutylene is also widely used in automobiles. Field of waterproof sealant for refrigerator. Pressure-sensitive adhesive based on synthetic rubber: polyisobutylene is usually used as the main component. For example, after the polymer of polyisobutylene elastomer is mixed with semi-liquid in a certain proportion, the transparent pressure-sensitive adhesive tape is coated on the transparent substrate. Formula of sealing putty: polyisobutylene 38.5 liquid polyisobutylene 6 1.5 liquid paraffin 38 rosin 10 zinc oxide 54 asbestos 50 chromium trioxide 10 This formula is mainly used for sealing metal bonding gaps and other joints. The shear strength is 49 kPa. Long storage period, no deterioration after one year storage. High molecular weight polyisobutylene and polyethylene are mixed as cable coating, and can also be used for waterproof tape, waterproof stone, waxed paper and hot melt adhesive. (2) Electronic insulation: polyisobutylene, natural rubber and synthetic rubber (butyl rubber; SBR) has good water resistance and high air permeability. Because of its anti-aging and anti-oxidation effects, polyisobutylene is also used as insulation tape and anti-corrosion tape for wires and communication cables. The adhesive impregnated paper insulation power cable impregnant has high viscosity and is not easy to flow in the cable working temperature range, but its viscosity is low at the impregnation temperature, which can ensure good impregnation. Viscous impregnant Many countries use polyisobutylene and bright oil as low-voltage cable impregnant (bright oil accounts for about 65 ~ 70, polyisobutylene accounts for about 30 ~ 35). Because of its excellent insulation performance, it is used as a cable sleeve/joint with high breakdown voltage. In order to improve the moisture resistance and stability of communication cables, integrated cable sheaths are widely used in local telephone cables. Alpeth: the cable core is extruded with polyethylene sheath, then the ground is longitudinally wrapped with 0.2mm corrugated aluminum tape, filled with polyisobutylene insulation material, and then the thermoplastic adhesive layer is pasted outside, and the polyethylene sheath is extruded outside. (3) In paraffin wax and its modified product ([microcrystalline wax]) in petroleum wax, polyisobutylene is sometimes added to improve the toughness and adhesion of wax. When polyisobutylene is mixed with paraffin or microcrystalline wax, it will increase the tensile strength and improve the brittleness of the product at low temperature and low humidity, especially for the packaging of frozen food, which has high flexibility and acid resistance. (4) Waterproof materials can be made into elastic tire-free waterproof coiled materials, waterproof films, waterproof coatings, coating materials, and sealing materials such as ointment, frankincense and water stop. These products have the characteristics of high tensile strength, high elasticity and elongation, good adhesion, good water resistance and weather resistance, can be used cold and have a long service life. It can also be used as a waterproof layer between two layers of composite lining (tunnel lining divided into two layers). If polyisobutylene is mixed with asphalt glue, waterproof agent, engineering sealant and electronic insulation products, the flexibility and cold resistance of its products will change greatly. It can improve the heat resistance, load resistance, skid resistance and crack resistance of asphalt pavement. In roofing coatings, the use of polyisobutylene will increase the low weather resistance and greatly change the low temperature performance of products. The reference formula of roof sealing layer is: 50% carbon black +8- 10% polyethylene/polyvinyl chloride +20-30% B 150 (5). Viscosity index improver is also called tackifier. It is used to improve the viscosity of oil products and the viscosity-temperature characteristics to meet the viscosity requirements of oil products in a wide temperature range. Mainly used for blending multi-stage internal combustion engine oil, automatic transmission oil and low-temperature hydraulic oil. (6) The sealant polyisobutylene has the characteristics of excellent weather resistance, aging resistance and durability, and at the same time, it has low moisture permeability and does not produce fog and smoke, so it is very suitable for insulating glass sealant and barrier sealant for double-glazing doors and windows. The application of polyisobutylene, carbon black, antioxidant and ultraviolet absorber in the production of insulating glass sealant can increase the flexibility and permeability of the product. Because the country attaches great importance to the environmental protection of domestic insulating glass production, the use of polyisobutylene in this area will gradually increase. (7) Good weather resistance of adhesive tape >: NR, adhesive acrylic acid and low polarity acrylic acid/rubber make it widely used in adhesive industry. Self-adhesive insulating tapes can have medium/high molecular weight, and common tapes for cable insulation and underground pipeline rectification can be developed with hot melt adhesive as required, mainly containing low, medium and high molecular weight PIB, and low and high molecular weight PIB (8) film and graphite are used as conductive films; It can be used as a magnetic film together with barium ferrite in thin films, and is compatible with fillers such as carbon black, graphite, chalk, shale, Synchro, clay and talc. High plasticity; Automobile protective film with good water resistance and weather resistance: PE and PP are mixed in the production process to protect the whole vehicle, parts and components, and EVA*** polymer, PP, HDPE, LDPE and LLDPE can be added to improve its physical strength. (9) Polymer Drag Reducer After polymer drag reducer is added to the fire hose, the water flow can still be maintained with the hose with smaller diameter, which is convenient for firefighters to carry. After adding drag reducer to farmland irrigation, irrigation efficiency can be improved and irrigation area can be expanded; Adding drag reducer in water-oil transportation system can save energy consumption; In flood discharge pipeline, drag reducer can also improve flood discharge efficiency when encountering flood peak; In oil well drilling, adding polymer drag reducer to injected water can greatly improve the injection speed. (10) Application in explosives Plastic explosives are made of high explosives, adhesives and plasticizers. It is characterized by good plasticity and can be made into various shapes. Usually, polyisobutylene is used as binder and dioctyl sebacate as plasticizer, which is widely manufactured by suspension method. Flexible explosives are characterized by certain elasticity, toughness and flexibility. It can be folded and bent, has good water resistance, looks like rubber, leather or soft plastic products, and can be used to make ropes, plates, films, strips, pipes and cones. Mainly used in some special explosion occasions and devices. Such as underwater cutting, aerospace, metal explosion processing, etc. Pyrotechnics is a triethylaluminum combustion agent with magnesium and magnesium alloys as the main components and polyisobutylene as the thickener. Triethylaluminum is a spontaneous combustion substance, and its combustion temperature can reach 2300℃. It is usually thickened with polyisobutylene and used as a combustion agent. (1 1) Surface treatment of printed matter Surface treatment is to properly treat the surface of printed matter to increase its luster, light resistance, heat resistance, water resistance and wear resistance, thus protecting printed matter. Hot-melt compounding method Hot-melt compounding method is to use polyisobutylene and other modified wax, heat it to make it in a solution state, coat it on the film substrate, directly attach the second substrate to it, and then cool it with a cooling roller. This method does not need the drying process after coating adhesive, and the equipment is simpler than the dry compounding method, which is suitable for compounding aluminum foil/paper, plastic/plastic and plastic/lead foil. (12) Polymer gas sensor The physical properties of polymer gas sensing materials, such as resistance, dielectric constant, surface acoustic wave propagation speed and frequency, and material weight, will change when encountering a specific gas. Polymer gas sensing materials play an important role in the detection of toxic gases and food freshness because of their easy operation, simple process, good room temperature selectivity, low price and easy combination with microstructure sensors and surface acoustic wave devices. Polymer gas sensor has high sensitivity to specific gas molecules, good selectivity and simple structure, and can be used at room temperature, which can supplement the shortcomings of other gas sensors. (13) The common flexographic plate-making method in corrugated paper printing is rubber embossing: natural rubber or synthetic rubber material is put into the master mold and heated and pressurized. The advantages of molded rubber relief are: once the master is made, it is easy to make rubber replicas, and its thickness can be controlled freely. Various rubber plates, such as polyisobutylene rubber plates, can be made according to different ink substrates. (14) special purpose 1. This material is also widely used in industrial buildings because of its high viscosity, waterproof and tear resistance. For example, in order to prevent earthquakes and buildings from shaking violently, this raw material, the viaduct of the expressway, is also used for shock absorption. 2. The top of the car is coated with protective film to prevent acid rain; When polyisobutylene is used together with pressure-sensitive adhesive with polyolefin resin, it will increase water resistance and post-treatment performance. 3. Infrared hollow fiber sensing: hollow fiber coated with polyisobutylene, solid fiber detector: ATR crystal coated with polyisobutylene as solid-phase microextraction membrane. 4. As an additive, it is coated on the surface of natural rubber and synthetic rubber to play a protective role. 5. Improve the mechanical strength of hard rubber. 6. Disposal of wastes, metal residues, toxic sludge and oil spills. 7. Disposal of recycled plastics. 8. Recycling vulcanized rubber. 9. Mix with other polymers to make sterile tube-dipping tube-automobile protective film-decorative film for medical suction equipment and medical metering equipment. For example, composite film containing textile fiber-household film-sealing of disposable syringe-non-slip food/feed/cardboard packaging film-outer coating of yogurt cup-cosmetic packaging-packaging film of baote bottle cap-non-slip table mat-protective plate of food and medical vacuum cleaner (15) Polyisobutylene for chewing gum is mixed with paraffin and resin to improve the quality of chewing gum; At the same time, chewing gum becomes softer and more stable, maintains good hydrophobicity and has excellent film properties. (16) polyisobutylene, a food-grade adhesive, can be mixed with various cross-linking agents (including pressure-sensitive adhesives), mainly playing the role of adhesion and modification. Polyisobutylene is hydrophobic, and it reacts with hydrophilic substances (CMC；; Pectin; Gel), maintain low toxic absorption and high temperature stability, adjust hardness and antibacterial properties. (17) polyisobutylene, a food packaging material, is mixed with various waxes and polymers, and used as a release agent for packaging films, such as polyisobutylene and paraffin, and as a polymer for cheese packaging films. Polyisobutylene can improve the low temperature stability and water resistance of products. (18) polyisobutylene, a food-grade hot melt adhesive, has plasticizing effect and is used in thermoplastic rubber (TPR). (19) food additive gum base, also known as gum base, is a high molecular compound. After adding polyisobutylene, it has proper viscoelasticity, chewiness and smoothness, and is used to make chewing gum. (20) Application in Microencapsulation Technology Because the condensed phase separation technology of ethyl cellulose from organic solvents does not require complicated operation and expensive production equipment, people have done a lot of research in this field, and some microcapsules prepared from ethyl cellulose have been put on the market. SueinssonSJ et al. prepared naproxen microcapsules with EC and polyisobutylene by condensed phase separation method. They heated and dissolved polyisobutylene in 300ml cyclohexane, and added EC into the hot solution (50℃) with stirring at 400 or 700rpm to disperse naproxen in the encapsulated polymer, and kept the temperature at 80℃ for 65438 0 hours, then gradually lowered the temperature to 45℃ for 65438 0 hours, and then quickly lowered it to 20℃ to solidify the microcapsules. Rinse with 200 ml of cold cyclohexane for three times, vacuum filter and dry at 50℃ for 30 minutes. Under the electron microscope, it was observed that the microcapsules were polynuclear, irregular in shape and loose in internal structure, and naproxen crystals wrapped in EC could be seen. With the increase of polyisobutylene concentration, the surface of microcapsules is smooth gradually, but the shape is irregular, and the dissolution rate of drugs is gradually increased. (2 1) depot (membrane controlled) transdermal patch scopolamine takes microporous polypropylene as the controlled release membrane, polyisobutylene as the drug depot (22) Depot transdermal drug delivery system, and the adhesive layer is mostly polyisobutylene pressure sensitive adhesive. Polyisobutylene is the main adhesive of skeleton transdermal drug delivery system. Preparation of skeleton transdermal drug delivery system: Taking estriol transdermal drug delivery system as an example, a "micro-depot controlled release system" based on silicone rubber was prepared. Accurately weigh estradiol, put it in a mortar, add a proper amount of PEG 400 solution (a small amount of transdermal absorbent can be added if necessary), grind it evenly, add a certain amount of polydimethylsiloxane, grind it into a thick gel, put it in a vacuum drying oven for 20 minutes, remove the air contained in the gel, and finally add crosslinking agent polyisobutylene pressure-sensitive adhesive and catalyst ethanol, grind it evenly, pour it into a stainless steel mold, and press-form. (23) Non-slip food/feed/cardboard packaging film LLDPE, 2-5%, cast/blown film, reducing air permeability/anti-condensation performance.