TPV has the similar properties of thermoset rubber and processing speed of thermoplastics. It is mainly characterized by high performance / price ratio, flexible design, light weight, wide temperature range, easy processing, product quality and dimensional stability And recyclable. Since its debut in 1981, TPV has been used in almost all rubber products except tires. The varieties include EPDM / PP, NR / PP, NR / PE, IIR / PP, ACM / PP, NBR / PP, EPDM / PBT, EPDM / PA, NBR / PA, ACM / PET and so on. Recently, the U.S. AES Company increased the price of its TPV products by 5% in view of the strong demand growth of TPV. At present, the main application areas of TPV are: automotive industry accounts for 30% -40%; electrical and electronic industry accounts for 10% -15%; civil engineering and construction industry accounts for about 10%; other fields account for 30% -40%.
1, high-performance materials in automotive parts
The biggest use of foreign TPV is the manufacture of auto parts, mainly EPDM / PP TPV and NBR / PP TPV. With the development of high performance (high speed, safety, comfort, energy saving), long life and light weight of automobiles, TPVs for automobile parts, especially automobile sealing systems, engine systems and the like have been increasingly sought after to replace traditional thermosetting vulcanizates . TPV applications in automotive sealing systems include windshield seal seals, side mirror seals, awning sealing materials, etc. Applications in automotive engine systems include air vents, hoses, shields, shock resistant cushions, shafts Set and so on. Other car parts such as brake parts (cups, aprons) and silencers and so on. The automotive industry is a very important thermoplastic elastomer applications, with a wide range of types, the total amount of features, the product can have a variety of processing forms, such as extrusion / co-extrusion products, injection products, foam products. According to the classification of parts usually have the following categories:
Weatherable seals: including dynamic seals and static seals. Dynamic seals have a door seal, door glass seal, lamp seals and a variety of special corner seals, etc .; static seals have windshield seals, side window seals, ceiling seals.
Car interior parts: the main components of the car interior parts, a variety of handles and handles, such as gear handle, window handle, door handles, etc .; plugs, sockets, trays and so on. The biggest special requirement is for the odor of the product, because the strict requirements on the parts in the car tasteless. In addition the coloring performance is also demanding, due to the special shape of the workpiece, the majority of the car interior parts are produced by injection molding.
External parts of the vehicle: The external parts mainly refer to the elastic parts used in the part other than the passenger compartment, such as the mailbox seal, the front spoiler, the fairing air flap, the mirror pad, the light seal, the fuel inlet cover , Fenders and so on. Because most of the outdoor parts, so the weather is very demanding.
In addition, automotive thermoplastic elastomers also include some components in the automotive front cover accessories and bodywork, the most typical such as tubing. It should be noted that, due to the TPV internal vulcanization cross-linked structure, ordinary TPV oil resistance is good, but demanding oil resistance occasions are generally used special oil-resistant TPV. All manufacturers generally have this special grade.
2, in wire and cable, power transmission, spare parts application
TPV has excellent abrasion resistance, weather resistance, chemical resistance, ozone and environmental pollution, easy to color, aging and a wide range of high tensile properties under the use of temperature retention characteristics to fully meet the wire and cable industry Standard, in the field of electrical applications more advantages than the traditional thermosetting rubber. TPV for wires, cables, even in wet conditions still have good electrical insulation. Halogen-free flame retardant grade TPV less environmental pollution, less smoke in case of fire, less corrosion and less toxic substances; used in molded electrical parts, has excellent water tightness, such as the use of different materials, can make the connector is embedded To TPV-made electrical socket, to form a whole new piece with excellent water tightness, and low cost, in addition, due to its excellent weather resistance, low temperature flexibility, dimensional stability and design flexibility, Do more sophisticated products, but no effect on the electrical insulation. TPV can also be used for power transmission systems.
3, building materials
EPDM / PP TPV is the ideal material for doors and windows, glass sealing and expansion of the gap glue, with good durability, long service life and excellent sealing, weatherability and chemical resistance; for extrusion; , Low cost, precise size, three times higher than EPDM, CR, MVQ; fast thermal welding, saving time, cost, without adhesives or special injection welding machine; good compatibility with PC or ACM, no cracks or rifts ; Low compression set, showing good memory under long-term sealing pressure; easy to color, optional color, and other accessories to maintain the same color; low temperature flexibility, long-term use at -60 ° C; fatigue resistance. The construction industry, including civil and industrial buildings, is a major trend in the application of TPVs. TPV sealing materials have been considered as the most preferred material in the world in particular, in certain sealing materials for windows, skylights. The main reason is the existing and potential market capacity of TPV sealing materials, and its good sealing effect no less than the traditional thermosetting rubber, while TPV material itself has a good design to make it practical Although the type is relatively less , But the absolute amount of larger. Specific examples of door and window seal, the construction of urban large-scale expansion joints, roofing materials, water-stop materials. The most common production technology is extrusion molding. Newer technologies that have recently emerged in the field of sealants are the foamed TPV sealants, which are based on the selection of special grades of TPV and foaming systems to produce blistering seals. The result of this is to reduce costs and improve the market competitiveness of products.
As the majority of building products for outdoor products, so the product's weatherability, ozone aging and resistance to chemicals and so has a particularly high demand. These are generally considered to be the advantages of PP / EPDM TPV materials.
4, electronic products
Electronic products include consumer electronics and industrial applications electronics. Among them, the daily consumer electronic products are a kind of products similar to the TPV products in the automobile. There are various kinds of products, and the dosage varies greatly among different types. For example, a computer mouse is provided with a mouse wheel capable of providing a comfortable feel, a chemical-resistant ink-resistant and heat-resistant printer paper conveying wheel shaft and a cover for the scanner, and the like; and a mobile phone button providing a satisfactory touch feeling, Walkman to ensure good sealing and shock-proof storage components, the camera's handle part, the speaker's certain vibration components and shock-proof bracket. Due to their varied shapes, these consumer electronic products are mainly processed by injection molding, extrusion and coextrusion. In addition, TPV has gradually found some application markets in the field of industrial application electronic products, including wire and cable, power transmission and some Molded parts, more use of extrusion and injection molding to complete the production.
5, packaging materials
EPDM / PP TPV and IIR / PP TPV are ideal materials for packaging materials in terms of performance and aesthetics. They are widely used in the fields of high temperature resistance, chemical resistance, low compression set, tensile properties and dynamic fatigue resistance. At: (1) food and beverage; TPV is the best packaging material for distilled water, milk, juice, beer, white wine and foodstuffs, with good sealing, good flexibility in a wide temperature range, good chemical resistance , High temperature shrinkage and good coloring, low permeability and other characteristics; (2) Beauty and cosmetics: with a variety of colors to match, you can paint, color mixing, oil, chemical resistance, excellent impact number is not easy to stain or produce Scratches; (3) in medicine: medical grade TPV made of septa, seals, gaskets by steam autoclave, high-energy ionizing radiation and ethylene oxide disinfection, the performance of no change. Medical Grade TPVs have excellent stability for most typical medical fluids.
According to the different classification, the handle or the handle could have been originally classified into other applications, the reason why the handle will be a separate category, because the use of TPV to create a variety of tools and control of the handle or handle equipped with the common, Although subordinate to different categories, the essence of the essence or the commonality of the handholds, though belonging to different categories, is basically the same as that of nature. Compared with ordinary plastic handle or handle, TPV products can provide a more comfortable and soft feel, while providing non-slip performance and a wide range of temperature, especially injection molding. Therefore, in such applications can be said that TPV is a set of two materials in one of the advantages, also known as make up two kinds of materials in the application of defects.
Depending on the specific application, the handle or handle applications include: Kitchen and household appliances, everyday tools and gardening supplies, personal hygiene products, sports and leisure products, office supplies, packaging and cosmetics.
7, medical and health industry
This is an area where product requirements and their rigor are stringent. High-quality TPV in the field of health care applications mainly for the original natural rubber and silicone rubber and other products. Among them for the natural rubber is to provide non-allergenic material and nitrite rubber is to provide a relatively equivalent performance but the price is relatively low alternative. However, the TPV used in the medical field is a special grade of TPV, and the product needs to be strictly controlled. From formula selection, raw material selection and treatment to production process control, product quality inspection and the like need to be treated seriously. So only specialized medical grade can be used in this area. In addition, the performance requirements of other common TPV products in addition to the conventional physical performance requirements, but also through the medical field to meet the special requirements, such as: after repeated disinfection of physical properties remained unchanged, the disinfection of high pressure steam Disinfection, γ-ray irradiation disinfection, ethylene oxide disinfection, etc .; a high degree of environmental stability, the need to deal with a variety of high concentrations of oxygen, ozone and other environments to maintain the same basic performance; resistance to a variety of liquid, because in practical applications Requires access to a variety of del liquid, such as ethanol / water, acetaldehyde solution, isopropanol, butanol, vinyl acetate, etc., requiring medical TPV products in contact with these liquids performance remained essentially unchanged. In addition, it is important that medical TPV products meet a wide range of bio-toxicity tests. Conventional molding methods are injection molding, extrusion and coextrusion.
8, other areas
EPDM / PP TPV is used in the preparation of personal care products and stationery products. It has the advantages of good appearance and coloring, flexible design, heat resistance, chemical resistance, steam resistance and anti-cleaning agent, meeting the FDA requirements. Because of its safety and good shock resistance, it can also be used in sports, hunting and fishing equipment. More importantly, a variety of TPV can be blended with better performance of the blend. Such as NBR / PP TPV and EPDM / PP TPV blends have oil resistance and NBR / PP TPV quite comparable, but good low temperature resistance, for different resin matrix TPV blends, such as nylon-based TPV and polypropylene-based blend of TPV , Can be modified by maleic acid with PP and nylon reaction nylon - polypropylene graft copolymer technology to improve the compatibility of the two kinds of TPV. By changing the plastic components or rubber components, expand the variety of TPV components selected varieties, increase TPV varieties.