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Advantages, disadvantages and differences of thermoplastic elastomers TPV, TPE, TPR, TPU, TPO!

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Advantages, disadvantages and differences of thermoplastic elastomers TPV, TPE, TPR, TPU, TPO!

作者: Release Date: 2019-11-26 Author: Click:

Advantages, disadvantages and differences of thermoplastic elastomers TPV, TPE, TPR, TPU, TPO!


Thermoplastic elastomer (Thermoplastic Elastomer) is an environmentally friendly low-carbon composite material with rubber characteristics (high elasticity, compression set, etc.) and processing characteristics of plastic (simple process).


It has many advantages: environmental protection, non-toxic and safe, wide hardness range, and excellent colorability, soft touch, weather resistance, fatigue resistance and temperature resistance, superior processing performance, no need to vulcanize, can be recycled to reduce costs, both It is over-molded, and it is covered with PP, PE, PC, PS, ABS and other base materials. It can also be molded separately.


Due to historical issues and usage habits, there is currently no unified name for thermoplastic elastomers at home and abroad. Most regions are accustomed to use the English abbreviation TPE to collectively refer to thermoplastic elastomers.


TPEs (thermoplastic elastomers) that have been industrially produced in the world are: styrenes (SBS, SIS, SEBS, SEPS), olefins (TP0, TPV), diene (TPB, TPI), vinyl chloride (TPVC, TCPE), urethanes (TPU), esters (TPEE), amides (TPAE), organic fluorine (TPF), silicone and vinyl, etc., cover almost all areas of synthetic rubber and synthetic resins.


1.TPV-Thermoplastic Vulcanizate

Dynamic full vulcanization: When the thermoplastic resin and rubber are melt-blended, the rubber phase is chemically cross-linked under the action of the cross-linking agent, and is sheared and broken into a large number of micron-level cross-linked rubber particles by means of strong mechanical shearing. The process of dispersing in the continuous phase of thermoplastic resin.


The performance characteristics of thermoplastic dynamic vulcanizate (TPV) include the following aspects (this data refers to the 11-64A “corresponding santoprene 101-64” quality inspection table provided by Dawn Beihua TPV):


2. TPO-Thermoplastic Polyolefin (ThermoplasticPolyolefin)

Is a simple physical blend of PP and EPDM (partially vulcanized), referred to as TPO.

In Japan, in addition to TPU, other thermoplastic elastomers are customarily referred to as TPO, that is, TPO = TPE = TPV = TPR as described by the Japanese; however, the current TPO is basically improved to highly vulcanized rubber (similar to TPV), but it is also added Part of SEBS is modified.


In 1984, Mitsubishi Chemical of Japan made a better-performance mixture based on SEBS and SEPS, and named this saturated TPS as "Rubberron". Therefore, SEBS and SEPS are not only general-purpose, but are melt-blended with PP plastic to form IPN-type TPS (so-called IPN is actually a polymer in which two networks penetrate each other, so it is also called an interpenetrating network compound; most of them It belongs to thermosetting resins, but there are also many thermoplastic elastomers in the form of cross continuous phase like TPE).


The IPN-TPS formed by using SBS or SE8S as the base material and other engineering plastics can be directly coated without pretreatment; the coating is not easy to scratch, and has certain oil resistance, and the elastic coefficient is not in a wide range of low temperature. What changes have greatly improved the cold and heat resistance of engineering plastics. Copolymerization of styrenic compounds with rubber can also become a thermoplastic TPE. EPDM / styrene, BR / styrene, CI-IIR / styrene, NR / styrene, etc. have been developed.


to sum up:

a. TPO and TPV are both polyolefin thermoplastic elastomers. In order to distinguish them on the TPV forum, they are referred to as polyolefin thermoplastic elastomers (also known as: thermoplastic elastomers partially vulcanized rubber);

b. TPO (TPO as the brand name is basically Japanese companies, such as Riken TPO), which is similar to the domestic TPV system, and the production capacity is quite tight (consumed by the Japanese automotive industry).


3. Thermoplastic elastomer TPE

It is generally called "TPE" material in China, which basically belongs to styrene thermoplastic elastomer. Styrene-based TPE (referred to as TPS abroad) is a copolymer of butadiene or isoprene and styrene block, and its performance is close to SBR rubber.


advantage:

It has the high elasticity of rubber and the characteristics of injection molding processing. It is environmentally friendly, non-toxic and safe, has excellent colorability, soft touch, weather resistance, fatigue resistance and temperature resistance, superior processing performance, does not require vulcanization, and can be recycled and reduced Cost, it can be over-molded, covered with PP, PE, PC, PS, ABS and other base materials, or it can be formed separately.


Disadvantages:

The biggest problem of SBS and SIS is poor heat resistance, and the operating temperature generally cannot exceed 80 ° C. At the same time, its elongation, weather resistance, oil resistance, abrasion resistance, etc. can not be compared with rubber.

In recent years, the United States, Europe and other countries have made a series of performance improvements to it, and SBS and SIS have appeared SEBS and SEPS after hydrogenation. SEBS (using BR hydrogenation as a soft segment) and SEPS (using IR hydrogenation as a soft segment) can greatly improve impact strength, weather resistance, and thermal aging resistance.


Types and composition of styrenic thermoplastic elastomers

Features of Modified TPE (SEBS / SEPS):

The modified TPE can withstand temperatures up to 110 ° C. Vo flame-retardant and halogen-free flame-retardant series of SEBS / SEPS modified TPE have good stretching effect and smooth surface. At present, it is more common in applications such as Apple headset cables. The manufacturers are from Taiwan, but they are expensive.


4.Styrenic elastomer TPR

Thermoplastic rubber (English: Thermoplastic Rubber-TPR); TPR was originally proposed by Americans. At that time, thermoplastic elastomers did not have a uniform name. It is customary to use the English acronym TPR for thermoplastic rubber, and TPE for thermoplastic elastomers. It is used in the information works); and applied to a simple blend of PP and EPDM. Later, AES's PP / EPDM type TPV (it was initially called TPR and later renamed TPV) also adopted this name, and later this The name may be called by the Taiwanese and it is popular on the mainland.


No matter what it is called abroad, at present China's domestic TPR and styrene TPE belong to the same concept, which means that thermoplastic styrene-butadiene-styrene block copolymer is commonly called thermoplastic styrene-butadiene rubber, that is, TPE = styrene TPE-like.


However, because of historical and translation issues, the Chinese abbreviation for TPV (Thermoplastic Dynamic Vulcanized Rubber) is called Thermoplastic Rubber (English ThermoplasticRubber), which is TPR. This is that we do not tell customers that our material PP / EPDM TPV is called TPR, because some customers think that it is styrene elastomer, if it is SBS base material, the price is much lower than TPV.


5. Polyurethane-based thermoplastic elastomer (referred to as TPU)

Polyurethane TPE is a thermoplastic polyurethane rubber which is composed of urethane hard segments and polyester or polyether soft segments which react with isocyanate.


Advantages: TPU has excellent mechanical strength, abrasion resistance, oil resistance and flex resistance, especially the most outstanding abrasion resistance; temperature resistance: -30-120 ° C.

Disadvantages: poor heat resistance, hot water resistance, compression resistance, easy yellowing of the appearance, easy to stick molds, precise processing requirements and high processing costs.


At present, there is no uniform name for thermoplastic elastomers. It is customary to use English acronyms. For the sake of uniformity, they are called TPE or thermoplastic elastomers.

(1) TPE = TPR, is a general term for all thermoplastic elastomers and thermoplastic rubbers, and represents styrene elastomers in China.

(2) The styrene elastomer TPE (SBS, SEBS, SIS matrix) and dynamic vulcanized rubber TPV (EPDM + PP-X) in the United States, Taiwan, and other regions are not classified and are collectively referred to as TPR.

(3) EPDM + PP elastomers are polyolefin elastomers, that is, TPV and TPO are the same concept.

(4) TPV / TPO difference of polyolefin elastomer:

a. Common points: TPO and TPV are made of EPDM (polyolefin elastomer) + PP.

b. Differences: TPO-polyolefin thermoplastic elastomer; TPV-dynamic vulcanized thermoplastic elastomer rubber; TPO is a simple physical blend (partial vulcanization, low degree of crosslinking), TPV is fully vulcanized (dynamic micron-level inserts) Formula is completely vulcanized, and the degree of crosslinking is very high).

(5) TPU: abrasion resistance, large stretch; poor elasticity, not resistant to acid, alkali and oil.

TPV: acid and alkali resistance, oil resistance, weather resistance, high temperature resistance, UV resistance and elasticity are the best; poor stretching.

TPE / TPR: Every performance is mediocre, the unit price is the cheapest.

热塑性弹性体

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Keywords: Thermoplastic Elastomer , Thermoplastic Elastomer Price , Thermoplastic Elastomer Manufacturer

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