ETPES Engineering Thermoplastic Elastomer Basics

1. It is a high strength, high performance material.

2. Its elasticity (elastic limit) and strength can be restored between hard engineering plastics and rubber.

3, their high elasticity is very practical in the following applications: after continuous impact, vibration, bending, must quickly restore the shape - such as car bumpers, hinges, springs, snaps, balls, shock absorbers and flexible transmission And sealed.

It is well known that engineering thermoplastic elastomers (ETES) have a higher strength (generally 2-6 times) than rubber. Therefore, in many applications, engineering thermoplastic elastomers can replace rubber products and save material and processing time. Because engineering thermoplastic elastomers are "functionally equivalent" to structural plastics on thick or support sites and elastic in thin areas; they can be used as multifunctional materials in many applications. The thermoplastic elastomer for chemical engineering has a flexural modulus of from 34.5 (approximately 3 times the stiffness of the rubber) to 1379 MPa (similar to the rigidity of nylon).

In chemical structure

This resin is a random block copolymer of a crystalline hard segment of polyester and a soft segment of amorphous glycol. The ratio of varying hard segments to soft segments can be made into a series of resins.

The strength and rigidity of thermoplastic elastomers for mechanical properties engineering are 2-6 times and 3 to 100 times, respectively, of "typical" rubber (hardness is Shore A70).

The strength, rigidity and elasticity of thermoplastic elastomer resins for general engineering are one-half, one-third and three-fold, respectively, of unreinforced nylon.

The thermoplastic elastomers for engineering have an ultimate elongation of about 500% and an elastic limit of 7-25% strain (depending on the grade).

This resin has superior bending life, spring properties and creep resistance. It maintains its properties over a wide temperature range.

Dynamic performance

A notable feature of engineering thermoplastic elastomers is their very good kinetic properties. Well-designed components do not lose their mechanical properties after repeated stretching and compression, and can withstand millions of bending cycles (even at -40 °F).

Impact strength

This resin has excellent toughness even at low temperatures. The softer, more flexible grade of engineering 13 uses thermoplastic elastomers that do not break in standard laboratory cantilever impact tests and can be used as polyester, vinyl, polyacrylate and styrene resistant Impact modifier.

temperature

The thermoplastic elastomer for engineering has excellent performance in a temperature range of 40 to 300 °F. Mechanical properties range from low to very high temperatures and are more stable than other thermoplastic elastomers and many rubber materials.

Other performance electrical properties

The thermoplastic elastomer for engineering has good dielectric strength at 600 volts.

For example, in low-voltage lines, only one-third of the thickness of the insulating sheath can be used, and the thermoplastic elastomer for engineering can replace the cross-linked polyethylene product. Therefore, both in terms of performance and economics, it is very profitable.

The flammability unmodified engineering thermoplastic elastomer is classified as UL HB grade; the additive grade added with additives is set to UL94-2 and ULV-10.

Chemical and environmental resistance

Engineering thermoplastic elastomer resins are highly resistant to chemicals and heat. Thermoplastic elastomers for high-rigidity grades perform best in hot hydrocarbon environments; ideal for use in hot oils, greases, fuels, and hydraulic fluids. The thermoplastic elastomer for engineering also has low permeability to fuel. The radiation resistance of thermoplastic elastomers for engineering has great advantages in nuclear energy engineering and medical products (sterilization).

Weather resistance

Engineering thermoplastic elastomers should be protected from UV radiation. The UV protection additive and the carbon black concentrate masterbatch can be added by metering blending on a molding machine.

According to the data from the ten-year test, it can be used in various climatic conditions with a suitably stable resin.

The thermoplastic elastomer for processing must be dried before processing.

Their processing is easy and the processing conditions are wide.

A standard injection molding machine, an extruder, a blow molding machine, a rotary molding machine, or the like can be used.

The film can be formed by extrusion molding and blow molding.

Since this resin has flexibility, it must be considered to prevent its compression and deformation when it is ejected. Therefore, it is recommended to use a large thrust rod with a large ejector and a stripper, as well as a large thrust device with a mandrel.

Unique processing includes:

1. Large inverted molds are available in simple hook and snap designs for molding complex shaped articles.

2. The overall buried active node can be made without special treatment.

3. On the same part, there can be thick and different sections.

4. Co-extrusion and insert molding compatibility with PVC, ABS, polyester and polyacrylate.

The thermoplastic elastomer resin used in engineering can achieve a Class A finish that reproduces the surface of the mold during molding. This allows the production of painted automotive parts without secondary processing. Applications Because thermoplastic elastomers for engineering have both mechanical properties, environmental resistance, ease of processing, and processing diversity, they can replace many materials. These include: metal, leather, rubber and cast, reactive injection molding (RIM) polyurethanes. The products that are manufactured using it mainly include: automotive parts, industrial products, and transportation equipment. Consumer products, communications, commercial equipment, and medical products.

In the field of painted automotive exterior parts, new markets have been opened up.

Including: instrument panel, bumper skin and veneer coating. The main reason is the low cost, excellent surface properties and superior durability of engineering thermoplastic elastomers. Another new trend is "injectable leather." The initial replacement for leather was in the footwear industry. The thermoplastic elastomer for engineering can be injection molded into an article equivalent to the texture and texture of leather, and has a high tear strength for sewing and bonding.