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Disadvantages of thermoplastic elastomer TPE and rubber performance comparison

Disadvantages of thermoplastic elastomer TPE and rubber performance comparison

Thermoplastic elastomer products have developed rapidly in recent years. It is said that "the global demand for thermoplastic elastomers (TPE) will continue to grow at an annual growth rate of 5.5%, and the global demand will reach 5.8 million tons by 2017." It is "2013 global rubber demand was 11.32 million tons, and the global rubber demand growth rate in 2014 was 3.9%." It can be seen that the output of thermosetting rubber is about twice that of thermoplastic elastomers, although the growth rate of thermoplastic elastomers is faster However, it takes a long time to exceed thermosetting rubber. In addition to the price, in terms of product performance, thermoplastic elastomers also have their soft ribs, which is the main reason why the current output of rubber can be so high. So what are the soft ribs of thermoplastic elastomers compared to thermosetting rubber? 1. Insufficient resilience, compression deformation, and tear resistance The cross-linking of thermoplastic rubber belongs to physical cross-linking, and thermosetting rubber is an authentic chemical cross-linking, so it is far inferior to thermosetting rubber in terms of tensile strength, compressive strength resilience, tear resistance, etc. This is not easy Modification can be achieved, so in tire applications for automobiles, heavy vehicles, aircraft, etc., it is not related to thermoplastic elastomers, at least for the moment (I heard that there have also been cutting-edge researches on the application of thermoplastic elastomers and tires) 2. Insufficient high temperature resistance The reason why thermoplastic elastomers have superior processing properties of thermoplastic resins is that the physical crosslinking of thermoplastic elastomers disappears at high temperatures, but this is both an advantage and a disadvantage, so under long-term high-temperature conditions, some properties of thermoplastic elastomers will be greater Decreases in amplitude, for example, TPE products can maintain their strength and resilience within 80 to 90 ° C for a few hours, but if they take too long, they will soften and lose their use value. Still taking tires as an example, during continuous driving Even if the tire continues to heat up, it still needs to maintain good mechanical properties, which is obviously not suitable for thermoplastic elastomers; 3. The solvent resistance is poorer than thermosetting rubber Thermoplastic elastomers have poor resistance to mineral oil and polar solvents (such as toluene, gasoline, etc.). For example, TPE can be easily dissolved in toluene solution, and it will also swell or even dissolve in gasoline. Thermosetting rubber is at most swellable, NBR It is rubber with good oil resistance, so this is also a major shortcoming of thermoplastic elastomers.

Post time:2020-04-14

Why does TPE material need to be dried?

Why does TPE material need to be dried?

Because there is always some residual moisture in the TPE particles just produced, drying the material can obtain a better product appearance, such as some high-end tool products and electronic products, which have high requirements for the appearance of TPE materials. It is recommended to dry the material.

Post time:2020-04-13

Common problems and solutions in the processing of thermoplastic elastomer TPV

Common problems and solutions in the processing of thermoplastic elastomer TPV

In the development process of materials that emphasize environmental adaptability, thermoplastic elastomers that do not require vulcanization and mixing processes have the characteristics of energy saving, resource saving, and high production efficiency. Their annual growth rate is as high as 6%. In this context, the use of new thermoplastic elastomer materials in processing and manufacturing plants is gradually expanding, but the problems that follow (roughened surface of the molded product, deformation, etc.) have also increased. 1.1 Albino Bleaching means that stabilizers and other compounding agents migrate to the surface of the molded product, and the surface shows a white phenomenon like spraying powder. The reason is mainly due to excessive blending of the stabilizer or incompatibility with the polymer. Therefore, stabilizers with good compatibility with polymers should be selected or the amount of stabilizers should be controlled in the best range. Secondly, it is also very effective to replace it with a relatively high molecular weight stabilizer. In addition, there are stabilizers that exert their functions by migrating to the surface of the molded product. For example, antistatic agents, lubricants, etc. For this kind of stabilizer, it is very necessary to select a stabilizer that hardly causes whitening even if it migrates. Thermoplastic elastomers rarely bleach when used in general environments, but in high temperature, humidity and outdoor long-term use, heat resistance stabilizers (anti-aging agents) and weather stabilizers are added to improve durability Is very necessary. Especially at high temperatures, because it is very easy to cause migration, the choice of stabilizer is also very important. 1.2 Sticky Compared with resin, the surface of soft thermoplastic elastomer is more prone to stickiness. The reason is mainly due to the migration of low molecular weight polymers and plasticizers and stabilizers to the surface due to aging. But no matter what the situation is, using infrared spectroscopy (IR) and other analytical methods, by analyzing the sticky components, it can be relatively easy to determine the relevant substances. Tackiness is mainly due to the excessively high molding temperature and the formation of low molecular weight substances due to thermal decomposition of the polymer. Although the set temperature of the molding machine itself does not reach the thermal decomposition temperature, the shear heat generation in the molding process sometimes makes it temporarily reach a high temperature. As a countermeasure, reducing the molding temperature and reducing the shear, and purging the inside of the hydraulic cylinder of the molding machine with nitrogen are very effective. In addition, when the molding machine is suspended, the rubber is left in the molten state of the molding machine for a long time in the molten state, and may sometimes become sticky due to thermal aging. In addition, products used at high temperatures are prone to stickiness. Therefore, the selection of stabilizers and softeners and the determination of dosage are very important. 1.3 Aging Compared with inorganic materials and metal materials, polymer materials have poor heat resistance and ultraviolet resistance (relatively easy to aging). The mechanical properties of most products are significantly reduced due to aging, and the appearance quality is deteriorated. By blending stabilizers such as heat resistance and weather resistance, the occurrence of aging can be suppressed to a certain extent.

Post time:2020-04-13

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