Dioctyl sebacate (DOS) is the best plasticizer for PVC polymers. DOS is remarkable for its lowest volatility as compared to other industrial plasticizers - DBS, DOP and DBP (Table1). This quality provides the lowest plasticizer migration from the given PVC polymer, long-term stability of the polymeric composition properties and its resistance to solvents. Polyvinyl chloride compositions, which contain dioctyl sebacate have much higher abrasion resistance that those plasticized with monomeric plasticizers. The DOS plasticizer pour point is equal to -60°C.
Practically all polymers can be plasticized, however, plasticization efficiency and plasticized polymer properties are mainly determined by the plasticizer chemical composition and molar weight.
Plasticizer contents of a given polymeric composition can very from 1-2 to 100 shares of the total polymer weight.
The most common phthalic acid esters are phthalates and carboxylic aliphatic esters; the most common phosphoric esters are phosphates and low-molecular-weight polyesters.
Sebacic plasticizers have a number of advantages as compared to the most commonly used phthalic and phosphoric esters.
PVC PLASTICIZING EFFICIENCY
Plastifier | ΔTv | Breaking elongation, % | Tv |
Tricresyl phosphate | 9,4 | 212 | -10 |
Diethyl phthalate | 9,8 | 228 | - |
Dibutyl phthalate | 10,6 | 240 | -20 |
Dioctyl phthalate | 10,6 | 240 | -20 |
Dioctyl sebacate | 15,1 | 420 | -56 |
ΔTv - decrease of vitrifying point at the infusion of 1% (molar weight) plasticizer;
Tv- vitrifying point value at the infusion of 8% (molar weight) plasticizer.
SAFETY REQUIREMENTS (QUOTATION FROM GOST 8728-88 WITH AMEND. 1)
Parameter | Plasticizer grade | ||||
DMP | DBM | DOP | DBC | DOC | |
Ambient working area air standard, mg/m3 | 0,5 | 0,5 | 1,0 | 10 | 10 |
Hazard class according to GOST 12.1.007-76 | 2 | 2 | 2 | 3 | 3 |
In this way, dioctyl sebacate is one of the safest currently used industrial plasticizers.
Dioctyl sebacate is used for the production of NGP-30-32 and NGP-40-32 (nonflammable); O-45, O-50 and O-55 (frost resistant) soft cable compounds and PL-1m, PLP-2m (shoe plasticate).
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