DOTP

Dioctyl terephthalate (DOTP) is an ester of 2-ethylhexanol and terephthalic acid with the formula C6H4(CO2C8H17)2 which is used as a commercial phthalate-free polyvinyl chloride plasticiser . DOTP has excellent plasticizing efficiency, excellent processing performance, superior thermal aging stability , high dielectric properties , high cold resistance and reduced volatility.
DOTP

WHY DOTP?



When we compare the physical and chemical properties of DOTP and DOP , nearly we can't distinguish their characteristics.But their differences are in their structure. DOTP is a terephthalate plasticizer , while DOP , DIDP and DINP are all orthophthalates.
Orthophthalates
R'=alcohol
for DOP R'=2-ethyl hexanol
for DIDP R'=isodecyl alcohol
for DINP R'=isononyl alcohol
DOTP, DOP, DINP as plasticizers get into between PVC polymer chains.As a result of this crystal properties of polymer decreases , becomes softer and shaped flexible named plastic. The reaction between the phthalates and terephthalates with heavy alcohols produce plasticizers. When PVC mixed this type of chemicals, it becomes plastic characteristic. The molecular weight of plasticizers are lower than PVC so they migrate to air or environment.This shortened plastics life. Migration of plasticizers inverse proportion to molecular weight.The other factor that effect migration is the geometric harmony of the plasticizer and PVC chain.

 

DOTP
DOTP and DOP have same molecular weight.Despite of this, inclination of physical structure to be linear DOTP is compatible to PVC polymer chain.Because of this speciality, the migration of DOTP is less than DOP. Plasticizer , which has higher migration, separate from the structure of plastic on process.Consequently to become required strenght for volatile rate necessity more usage of plasticizer.When DOTP used loss minimized, existence product more long-lived and strong.
When we compare DOTP with other plasticizers ,it has best physical and permanent characteristics inside of plasticizer. In all PVC applications that used like artificial leather, shoes, cable, pipe, canvas.

PROPERTIES OF DOTP

Plastisol viscosity is more stable and can’t change lots of days. Depend on this it gives uniform thicker products.

It has different structure than phthalic bases plasticizers. As a result of this, migration is lower. The materials ,which made with DOTP ,are more resistant.

Cause of its linear structure , ıt has better low temperature flexibility. And this decrease plastics fragile at lower temperatures.

It can lubricate itself cause of structural characteristics. Conclusion of this, preparing plastisol is much more shorter time and spending with lower energy.

DOTP in a lot of European countries directly contact materials with human like toys, nappy, medical material, artificial leather, water pipe, is not limited as carcinogen phthalates. You can add your products ‘NOT CONTAIN PHTHALATE’.

Cause of DOTP’s lower volatile ,you can use DOTP instead of DINP and DIDP.

Because of lower migration, materials can’t stick lactic surface.

Preferable plasticizer for producing cable with excellent electrical specialities.

DOTP TECHNICAL SPECIFICATIONS
GENERAL
Molecular weight , g/mol 390.57
Empirical formula C24H38O4
PHYSICAL
Form Clear liquid
Refractive index , n25ᵒC/D 1.4867
Acidity , as phthalic acid , % wt 0.01 max
Boiling Point , 760 mmHg , ᵒC 400
Specific gravity , g/mL 0.984
Solubility in water , 20 ᵒC , µg/L 0.4
Viscosity , 25 ᵒC , cP 63
ELECTRICAL
Volume Resistivity , ohm-cm 3.9x1012
Dielectric constant , 1 MHz 4.6
Dissipation factor , 1MHz 0.1x10-2
COMPARISON WITH OTHER PLASTICIZERS
DOP DOTP DINP DIDP
Plasticizer concentration to give equal modulus , phr 60 65 68 66
MECHANICAL PROPERTIES
Tensile Strength, MPa (psi) 16 ( 2,320 ) 15.5 ( 2,248 ) 14.5( 2,103 ) 14.7 ( 2,132 )
%Elongation 389 400 395 405
Tear Strength, N/mm 58 53,5 52,4 54,6
PERMANENCE
Soapy water , %loss 0.5 1.5 0.9 1.0
Oil extraction , %loss 9 15.6 15.5 15.7
Hexane extraction , %loss 24 33 33 32
LOW TEMPERATURE FLEXIBILITY
Torsion Modulus ᵒC
35,000 psi -30 -31 -29 -30
135,000 psi -46 -50 -44 -47