DOT 4. Makhalidwe, mapangidwe, GOST
Zamkatimu
Dothi lopanga 4
DOT-4 brake fluid ili ndi katundu wabwino kwambiri wa antioxidant chifukwa cha kuchepa kwa ma buffering agents (ma amines aulere) komanso pH yamtengo wapatali. Zamadzimadzi DOT-1-DOT-4 zili ndi boric acid esters ndi polypropylene glycol ngati maziko.
- Boric acid esters ya polypropylene glycol yokhala ndi esters monosubstituted propylene glycol
Amapanga 35-45% kulemera kwake. Khalani ndi makhalidwe abwino ndi kachulukidwe mosasamala kanthu za kusintha kwa kutentha ndi kupanikizika. Waukulu lubricant chigawo chimodzi.
- ethyl carbitol
Amayimira monosubstituted ethyl ether ya diethylene glycol (ethoxyethane). Imagwira ntchito ngati stabilizer ndi zosungunulira za esters. Zomwe zili - 2-5%.
- Ionol
Antioxidant zowonjezera. Imateteza kutenthedwa kwa borates pa kutentha kokwera. Gawo lalikulu: 0,3-0,5%.
- Azimidobenzene and morpholine
corrosion inhibitors. Amapereka pH yokhazikika. Zomwe zili - 0,05-0,4%.
- plasticizers
Orthophthalic acid dimethyl ester, phosphoric acid esters amagwiritsidwa ntchito ngati chofewa. Kuthandizira kupunduka ndikuwonjezera kukhazikika kwamafuta amagulu a polima. Iwo ali ndi ntchito pamwamba. Gawoli ndi 5-7%.
- Polypropylene glycol yolemera pafupifupi 500
Kuphatikiza ndi boron ether polycondensates, imathandizira mafuta opangira mafuta. Zomwe zili - 5%
- Tripropylene glycol N-butyl ether
Amamanga mafuta amafuta a hydrophobic. Amachepetsa kuthamanga kwapamtunda. Peresenti - mpaka 15%.
Chifukwa chake, DOT-4 brake fluid imaphatikizapo zambiri za borates, polyesters propylene glycol, plasticizers, anti-corrosion and antioxidant zowonjezera. Mu chiŵerengero chofananacho, zigawozi zimapereka zinthu zabwino kwambiri za hydromechanical ndi zodzoladzola pamene zimasunga makhalidwe ogwirira ntchito a mankhwala pa kutentha kwakukulu.
Zofunikira za GOST
Malinga ndi muyezo wapakati, DOT-4 ndimadzimadzi otentha otentha kwambiri kuti athe kugawanso katundu pamakina otsekedwa. Mtundu - kuchokera wotumbululuka wachikasu mpaka bulauni. Sichipanga matope ndipo sichikhala ndi zonyansa zamakina.
| mbali | Norm |
| Osachepera T kutentha, °C | 230 |
| Osachepera T vaporization yamadzimadzi a hydrated, ° С | 155 |
| Kukhazikika kwa Hydrodynamic pa kutentha kokwera | 3 |
| Kutulutsa kwa hydrogen | 7,5 - 11,5 |
| Kinematic viscosity pa 277K (40 ° C), St | 18 |
| Kachulukidwe pamikhalidwe yokhazikika | Osalembedwa |
Poyambitsa ma polima a organosilicon (silicates) ndikuchepetsa kuchuluka kwa esters ya boric acid, ndikosavuta kupeza brake fluid ya kalasi ya DOT-5. Chifukwa cha machitidwe ake abwino kwambiri, mafuta a hydraulic a gulu la DOT-4 ndi otchuka pamsika, ndipo kapangidwe kake kamankhwala kamakhala kosinthika nthawi zonse.
