International name: Dioctyl Phthalate

Synonyms: dioctyl phthalate, phthalic acid dioctyl ester, DOP

The chemical formula: C6H4 (COOCH817) 2

Appearance: viscous colorless liquid

Packing: eurocube, barrel; up to 2 years

Manufacturing: Czech Republic, Poland, Romania

 

Plasticizers. General information

are substances that are introduced into the composition of polymeric materials to impart (or enhance) elasticity and (or) plasticity during processing and operation. The plasticizers facilitate dispersion of the ingredients, lower the processing temperature of the compositions, improve the frost resistance of polymers, but sometimes impair their heat resistance. Some plasticizers can increase the fire, light and heat resistance of polymers.
General requirements for plasticizers: good compatibility with the polymer, low volatility, no odor, chemical inertness, resistance to extraction from the polymer by liquid media, for example, oils, detergents.
The most common plasticizers are esters, for example dioctyl phthalate, dimethyl phthalate, dibutyl phthalate, dibutyl sebacate, dioctyl adipate, dioctyl sebacate, diisobutyl phthalate, tri (2-ethylhexyl) phosphate, phthalic and trimellitic acid esters, orthophosphoric acid esters. Mineral and non-drying vegetable oils, epoxidized soybean oil, chlorinated paraffins, etc. are also used.
The amount of plasticizer in the composition is from 1 ... 2 to 100% (by weight of the polymer).
The main consumer of plasticizers is the plastics industry (about 70% of the total production of plasticizers is spent on the manufacture of plastic). Plasticizers are widely used in the production of nail varnishes.
Plasticizers are also surface-active additives, which are introduced into mortars and concrete mixtures (0.15 ... 0.3% by weight of binder) to facilitate laying in the mold and reducing the water content. This improves most of the characteristics of the solidified mixture, and also reduces cement consumption, reduces energy consumption when vibrating concrete (self-compacting mixtures) or leveling screeds (self-leveling self-leveling floor mixes).
A widely used plasticizer of this type is the sulphite-alcohol bard. Later, super- and hyperplasticizers with smaller dosages, as well as antifreeze, air-entraining and other useful properties were created.

 

Description

DOP of the highest grade has a chromaticity of not more than 40 units and is used for translucent products. DOP of the 1st grade has a chromaticity of 40-100 units and can be used for light-colored products. DOP 2nd class is used for the production of dark and black products and has a color from 100 to 200 units.
Another important indicator of DOP quality is its dielectric properties (the value of the specific volume electrical resistance). Far from always the DOP with good chromaticity indices has good dielectric properties, especially for imported products. Very often foreign companies, for customs reasons, supply DOP in a mixture with other plasticizers (for example, with dioctyl adipinate-DOA), which have obviously low dielectric parameters, while the appearance of an attractive and good color product is completely unsuitable for the production of insulating grades of plasticate with high requirements for specific volumetric electrical resistance.
 
In comparison with DOP, the dielectric properties of DOA (specific volume electrical resistance) are 10 times worse. Another widely used plasticizer in Russia is dialkyl phthalate (DAF). By its properties, it is close enough to DOP, but it has lower dielectric and characteristics, and can not be used for the production of plastic for food and medical purposes.

 

Properties

Not soluble in water, soluble in gasoline, chloroform, petroleum ether. It has chemical properties, characteristic for esters of complex. Dioctylphthalate is a colorless or slightly yellowish transparent oily liquid with a faint odor of fruit.

autoignition temperature 206 ° С

boiling point 385 ° C

freezing point -55 ° С

freezes

gaining viscosity

density of 0.98 g / cm3

Technical requirements applicable to dioctyl phthalate:

chromaticity according to the Khazen scale (determines the variety): * higher grade - no more than 40 units.

density at t ° 20 ° C: 0.984 g / cm3

flash point not lower than 205 ° С

acid number: not more than 0.07 mg KOH / g

mass fraction of volatile substances: not more than 0.1%

saponification number: 284-290 mg KOH / g

It is stored in ordinary "black" steel containers or in plastic containers (cubes), possibly in a sealed container, in a ventilated room, at a temperature of at least 0 ° C and not more than + 30 ° C, at a distance of not less than 1 m from heating appliances. Avoid moisture, direct sunlight and strong oxidants. Guaranteed shelf life - 6 months from the date of manufacture, can actually be stored for up to 10 years.

Receiving

The DOP plasticizer can be obtained by esterification of phthalic anhydride with the addition of octanol. in the course of the reaction, it is necessary to participate in a powerful catalyst, for example, arylsulfonic acid at a temperature of 130 to 150 ° C, as well as tetraalkyl titanate, heated to 160-180 ° C.

Application

Dioctyl phthalate (DOP), used as a plasticizer, is used:

- in the production of PVC products in order to improve the plasticity;

- in the manufacture of polymers from vinyl;

- in the chemical industry;

- in the production of cellulose ethers and polystyrene;

- in the composition of hydraulic and dielectric condenser liquids

 

Safety requirements

Low volatile high-boiling liquid. Refers to the 2nd class of danger.
The room in which work is carried out using dioctyl phthalate should be equipped with continuously operating ventilation. When working with plasticizers, special clothes and personal protective equipment should be used.

 

 

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