DOT 4. Hunhu, kuumbwa, GOST
Zviri mukati
Kuumba dot 4
DOT-4 brake fluid ine yakanakisa antioxidant zvimiro nekuda kweiyo yakaderera yemukati ye buffering agents (yemahara amines) uye yakakwirira pH kukosha. Liquids DOT-1-DOT-4 ine boric acid esters uye polypropylene glycol sehwaro.
- Boric acid esters ye polypropylene glycol ine monosubstituted propylene glycol esters
Vanoita 35-45% nehuremu. Chengetedza hunhu hwemhando uye density zvisinei nekushanduka kwekushisa uye kumanikidza. Iyo huru lubricant chikamu.
- ethyl carbitol
Inomiririra monosubstituted ethyl ether yediethylene glycol (ethoxyethane). Inoshanda seyakagadzikana uye solvent ye esters. Zviri mukati - 2-5%.
- Ionol
Antioxidant additive. Inodzivirira kutsva kwe borates pane tembiricha yakakwira. Chikamu cheMisa: 0,3-0,5%.
- Azimidobenzene uye morpholine
corrosion inhibitors. Inopa pH inodzikamisa maitiro. Zviri mukati - 0,05–0,4%.
- Plasticizers
Orthophthalic acid dimethyl ester, phosphoric acid esters inoshandiswa sechinhu chinopfavisa. Gadzirisa iyo deformability uye kuwedzera kupisa kugadzikana kwepolymer zvikamu. Vane chiitiko chepamusoro. Mugove uri 5-7%.
- Polypropylene glycol ine avhareji huremu hwe500
Mukubatana ne boron ether polycondensates, inovandudza lubricity yechigadzirwa. Zviri mukati - 5%
- N-butyl ester ye tripropylene glycol
Inosunga hydrophobic mafuta-mafuta zvimedu. Inoderedza kushushikana kwepamusoro. Muzana - kusvika ku15%.
Nokudaro, DOT-4 brake fluid inosanganisira yakakwirira ye borates, propylene glycol polyesters, plasticizers, anti-corrosion uye antioxidant additives. Mune yakafanana muzana reshiyo, zvikamu zvinopa yakanakisa hydromechanical uye lubricating zvivakwa uku uchichengeta hunhu hwekushanda hwechigadzirwa muhupamhi hwekushisa.
GOST zvinodiwa
Zvinoenderana neyakajairwa chiyero, DOT-4 ndeye yakakwira-inofashaira mabhureki fluid yekugoverazve mitoro mune yakavharwa mechini wedunhu. Ruvara - kubva kucheneruka kusvika kune brown. Haigadziri dhipoziti uye haina kusvibiswa kwekuona michina.
| Mamiriro | Norm |
| Minimum T kuvira, °C | 230 |
| Minimum T vaporization yemvura ine hydrated, ° С | 155 |
| Hydrodynamic kugadzikana pane yakakwirira tembiricha | 3 |
| Hydrogen kuburitsa | 7,5 - 11,5 |
| Kinematic viscosity pa277K (40 ° C), St | 18 |
| Density pasi pemamiriro ezvinhu | Not indexed |
Nekuunza organosilicon polymers (silicates) uye kuderedza chikamu cheboric acid esters, zviri nyore kuwana brake fluid yeDOT-5 kirasi. Nekuda kwemaitiro ayo ekuita zvakanaka, DOT-4 hydraulic girisi yakakurumbira pamusika, uye chimiro chayo chemakemikari chiri kuramba chichivandudzwa.
