DOT 4. Cov yam ntxwv, muaj pes tsawg leeg, GOST
Dot 4 muaj pes tsawg leeg
Nres dej ntawm tus qauv DOT-4 muaj cov khoom zoo heev antioxidant vim cov ntsiab lus tsis tshua muaj cov neeg ua haujlwm buffering (dawb amines) thiab siab pH nqi. Cov kua dej DOT-1-DOT-4 muaj boric acid esters thiab polypropylene glycol ua lub hauv paus.
- Boric acid esters ntawm polypropylene glycol nrog monosubstituted propylene glycol ethers
Ua kom 35-45% los ntawm qhov hnyav. Khaws cov yam ntxwv zoo thiab qhov ntom ntom tsis hais qhov kub thiab txias hloov pauv. Main lubricating tivthaiv.
- Ethylcarbitol
Sawv cev monosubstituted ethyl ether ntawm diethylene glycol (ethoxyethane). Ua raws li stabilizer thiab hnyav rau esters. Cov ntsiab lus - 2-5%.
- Ionol
Antioxidant additive. Tiv thaiv borates los ntawm hlawv tawm ntawm qhov kub siab. Qhov loj me: 0,3-0,5%.
- Azimidobenzene thiab morpholine
Corrosion inhibitors. Muab cov nyhuv pH-stabilizing. Cov ntsiab lus - 0,05-0,4%.
- Plasticizers
Orthophthalic acid dimethyl ester thiab phosphoric acid esters yog siv los ua softener. Lawv pab txhawb kev deformability thiab ua rau kom kub tsis kam ntawm polymer txuas. Lawv muaj kev ua haujlwm saum npoo. Qhia tawm - 5-7%.
- Polypropylene glycol nrog qhov hnyav nruab nrab ntawm 500
Ua ke nrog boron ether polycondensates, nws txhim kho lub lubricating yam ntxwv ntawm cov khoom. Cov ntsiab lus - 5%
- Tripropylene glycol N-butyl ether
Binds hydrophobic fat-roj particles. Txo qhov nro ntawm qhov chaw. Qhov feem pua ntawm kev sib faib - txog li 15%.
Yog li, DOT-4 cov dej nres muaj xws li cov ntsiab lus siab ntawm borates, propylene glycol polyethers, plasticizers, anti-corrosion thiab antioxidant additives. Nyob rau hauv ib qho piv txwv zoo sib xws, lub Cheebtsam muab zoo heev hydromechanical thiab lubrication zog thaum tswj cov kev ua tau zoo ntawm cov khoom nyob rau hauv ib tug dav kub ntau yam.
GOST cov cai
Raws li tus txheej txheem interstate, DOT-4 yog cov dej kub npau npau rau redistributing loads nyob rau hauv ib tug kaw mechanical circuit. Xim - los ntawm daj daj mus rau xim av. Tsis tsim sediment thiab tsis muaj qhov muag pom kev tsis pom kev.
| Характеристика | Norma |
| Yam tsawg kawg T Kub taw tes, ° C | 230 |
| Yam tsawg kawg T vaporization rau hydrated kua, ° C | 155 |
| Hydrodynamic stability ntawm qhov kub thiab txias | 3 |
| Hydrogen tawm | 7,5 - 11,5 |
| Kinematic viscosity ntawm 277K (40 ° C), St | 18 |
| Qhov ntom ntom ntawm cov xwm txheej txheem | Tsis indexed |
Los ntawm kev qhia organosilicon polymers (silicates) thiab txo qhov kev faib ua feem ntawm boric acid esters, nws yog ib qho yooj yim kom tau DOT-5 chav kawm ntawv nres kua. Hydraulic lubricant ntawm chav kawm DOT-4 yog nrov nyob rau hauv kev ua lag luam vim nws cov khoom zoo heev, thiab nws cov tshuaj muaj pes tsawg leeg tau txhim kho tas li.
