How to choose plasticizers with different uses?

2020-07-07 13:21:12

Plasticizers are the largest class of additives in terms of quantity, yield and consumption of plastic additives. According to Jiuzhi Plastics Network, the most widely used primary plasticizers are mainly phthalates and phthalic acid. Among them, the consumption of phthalate accounts for about 80-85% of the total plasticizer consumption; the two types of plasticizers have many varieties, high yield, and have light color, low toxicity, good electrical properties, and volatilization. Small size, low odor, low temperature resistance and other characteristics.

The most common general-purpose plasticizer commonly used in the market is dioctyl phthalate, which is mainly used for processing polyvinyl chloride resin, and can also be used for processing high polymer such as chemical fiber resin, acetic acid resin, ABS resin and rubber. It can also be used in lacquers, dyes, dispersants, etc. However, in the actual production, how to choose the plasticizers with different varieties, different properties and different uses? Jiuzhi Plastics Network said that in order to choose the right and correct plasticizer, we must consider the following three conditions:

1. The Tg of a rubber or rubbery substance (ie, elasticity or fraction) must be much lower than the test temperature. In order to obtain high impact strength at room temperature, the Tg of the rubber or rubber-like substance is at least 20 to 40 Â° C lower than the test temperature to offset the effect of high deformation speed during the impact test;

2. The elastic material is dispersed in the hard polymer to form a second phase;

3. There must be good adhesion between the two phases.

According to these conditions, the properties of the toughener used in the toughening of polyvinyl chloride and the like must also meet the following six characteristics:

1. The compatibility with PVC, etc. is moderate. If it is too large, the two are completely mixed at the molecular level, then the toughening agent becomes a plasticizer, and the shape does not form two phases, which does not increase the impact strength: The compatibility between the two is too small to achieve uniform dispersion, and the toughening agent loses its adhesion to polyvinyl chloride, etc., and cannot absorb impact energy, and the impact strength cannot be improved:

2. The temperature of the toughening agent is low, and the impact strength of the polyvinyl chloride or the like can be improved at a low temperature;

3. The molecular weight of the toughening agent is high, and it is preferable to have a slight cross-linking when necessary to improve the toughening effect;

4. No significant effect on the apparent properties and physical and mechanical properties of PVC:

5. Good weather resistance and small film expansion;

6. Easily blended with the polymer, preferably having a shape and particle size similar to the polymer.

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For Manufacturing heating -pipelines , containers pipelines for low or medium pressure boilers ( P <5.88 Mpa; T<450 C ). main steel tube grades.

other grade can be also provieded after consulting with customers.

Seamless Steel Tubes For Low And Medium Pressure Boiler

medium pressure boilers

Liaocheng Xinglong Seamless Tube Manufacturing Co., Ltd. , https://www.lcxlpipe.com