Muaj ntau hom yas yas. Hauv nws qhov kev tshawb fawb thiab kev txhim kho, muaj ntau dua 1,000 hom yas yas. Muaj tsuas yog ntau dua 200 lub yas ntim khoom lag luam tsim tawm, thiab feem ntau yog phthalates los ntawm kev lag luam roj av.
Muaj ntau txoj hauv kev faib tawm rau cov yas yas. Raws li qhov hnyav ntawm lub cev, nws tuaj yeem muab faib ua cov yas yas monomeric thiab polymeric yas yas; raws li cov duab, nws tuaj yeem faib ua cov yas yas thiab cov yas yas zoo; raws li kev ua tau zoo, nws tuaj yeem faib ua cov yas yas dav thiab cov yas tiv taus txias, Cov yas yas tiv taus cua sov, nplaim hluav taws kub yas, thiab lwm yam; kev faib tawm raws li cov txheej txheem tshuaj lom neeg ntawm cov yas yas yog siv ntau txoj hauv kev faib tawm.
Raws li cov qauv tshuaj, nws tuaj yeem faib ua:
(1) Phthalates (xws li DBP, DOP, DIDP)
(2) Aliphatic dibasic acid esters (xws li dioctyl adipate DOA, dioctyl sebacate DOS)
(3) Phosphate (piv txwv li: tricresyl phosphate TCP, toluene diphenyl phosphate CDP)
(4) Epoxy compounds (xws li epoxidized soybean oil, epoxy butyl oleate)
(5) Polymeric yas yas (xws li propylene glycol adipic acid polyester)
(6) Benzoic acid esters (xws li 1,2,4-triisooctyl trimellitate)
(7) Tshuaj chlorine muaj cov yas (xws li chlorinated paraffin, methyl pentachlorostearate)
(8) Alkyl sulfonate
(9) Polyol ester
(10) Lwm yam yas yas
Cov yas zoo tshaj plaws yuav tsum muaj cov khoom hauv qab no:
(1) Zoo sib xws nrog cov tshuaj;
(2) Kev ua kom zoo yas zoo;
(3) ruaj khov rau cua sov thiab teeb;
(4) Tsawg volatility;
(5) Tsawg tsiv teb tsaws chaw;
(6) Tiv thaiv kom tshem tawm cov dej, roj, thiab cov kuab tshuaj organic;
(7) Zoo qis kub hloov pauv;
(8) nplaim hluav taws zoo;
(9) Kev tiv thaiv hluav taws xob zoo;
(10) Tsis muaj xim, tsis qab thiab tsis muaj kuab lom;
(11) Cov pwm ua haujlwm zoo;
(12) Kev ua kom muaj kuab paug zoo;
(13) Cov viscosity ruaj khov ntawm plastisol yog qhov zoo;
(14) Tus nqi qis.
Ntawm cov yas yas, phthalate ester yas siv feem ntau, suav txog 80% ntawm tag nrho cov khoom siv yas. Hauv Suav teb, hom yas yas no feem ntau yog tsim los ntawm dioctyl phthalate (DOP) thiab phthalic acid. Feem ntau yog dibutyl ester (DBP). Vim yog qhov txwv ntawm qhov chaw ntawm cov khoom siv raw cawv, tso tawm ntawm ntau yam nrog kev ua tau zoo xws li diheptyl phthalate (DHP), diisodecyl phthalate (DIDP), thiab diisooctyl phthalate (DIOP) tsis loj.