Dab tsi yog cov tshuaj stability ntawm precipitated barium sulphate?

Precipitated barium sulphate, siv dav siv tshuaj lom neeg, paub txog nws cov khoom tshwj xeeb ntawm cov tshuaj lom neeg ruaj khov. Raws li tus neeg muag khoom ntawm [cov khoom npe], Kuv zoo siab los qhia txog cov ntsiab lus ntawm cov yam ntxwv no thiab tshawb nrhiav lawv qhov cuam tshuam hauv ntau yam kev lag luam.

Precipitated barium sulphate (BaSO₄) yog ib qho inorganic compound uas muaj barium (Ba), sulfur (S), thiab oxygen (O). Nws yog tsim los ntawm cov tshuaj tiv thaiv nag lossis daus, feem ntau yog los ntawm kev sib txuas ntawm barium chloride (BaCl₂) thiab sodium sulphate (Na₂SO₄) hauv cov tshuaj aqueous. Cov tshuaj tiv thaiv tshwm sim hauv kev tsim cov insoluble barium sulphate hais, uas tom qab ntawd lim, ntxuav, thiab qhuav kom tau txais cov khoom kawg.

Cov qauv tshuaj ntawm barium sulphate muaj barium cation (Ba²⁺) nyob ib puag ncig los ntawm plaub sulfate anions (SO₄²⁻) hauv tetrahedral kev npaj. Cov qauv ruaj khov no pab txhawb rau cov khoom siv tshuaj lom neeg zoo heev thiab ua haujlwm rau ntau yam tshuaj.

1. Resistance rau acids thiab Bases

Ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm precipitated barium sulphate yog nws cov kev tiv thaiv siab rau cov kua qaub thiab cov hauv paus. Nws yog insoluble hauv dej thiab feem ntau cov acids, xws li hydrochloric acid (HCl), sulfuric acid (H₂SO₄), thiab nitric acid (HNO₃). Qhov kev tiv thaiv no ua rau nws haum rau siv nyob rau hauv ib puag ncig uas yuav tsum tau raug rau acidic los yog alkaline tshuaj.

Hauv cov tshuaj acidic, barium sulphate tseem muaj tshuaj lom neeg, vim tias sulfate ion (SO₄²⁻) yog ib qho anion ruaj khov uas tsis hnov ​​​​mob nrog protons (H⁺). Ib yam li ntawd, nyob rau hauv alkaline daws, barium sulphate yog resistant rau hydrolysis thiab tsis yaj los yog decompose. Cov cuab yeej no tso cai rau nws tswj hwm nws txoj kev ncaj ncees thiab kev ua haujlwm hauv ntau yam ntawm pH.

2. Thermal stability

Precipitated barium sulphate nthuav tawm thermal stability zoo heev, ua rau nws haum rau siab -kub daim ntaub ntawv. Nws muaj lub siab melting point ntawm kwv yees li 1,580℃(2,876℃F) thiab tsis decompose los yog poob nws cov khoom siv tshuaj ntawm qhov kub siab.

Qhov thermal stability no yog vim muaj zog ionic bonds ntawm barium thiab sulfate ions nyob rau hauv cov siv lead ua lattice. Cov ntawv cog lus no yuav tsum muaj lub zog loj rau kev tawg, tso cai rau barium sulphate tiv taus qhov kub thiab txias yam tsis muaj kev hloov tshuaj lom neeg. Yog li ntawd, nws tuaj yeem siv rau hauv cov ntawv thov xws li txheej txheej, yas, thiab roj hmab, qhov tseem ceeb ntawm cov cua sov.

3. Oxidation Resistance

Barium sulphate yog heev resistant rau oxidation, uas yog tus txheej txheem ntawm poob electrons los yog ua kom lub xeev oxidation ntawm ib lub caij. Nws tsis hnov ​​​​mob nrog oxygen lossis lwm yam oxidizing cov neeg ua haujlwm nyob rau hauv ib txwm muaj, ua rau nws ruaj khov nyob rau hauv lub xub ntiag ntawm huab cua thiab noo noo.

Qhov kev tiv thaiv oxidation no yog qhov tseem ceeb hauv cov ntawv thov uas cov khoom yuav raug oxygen lossis lwm qhov chaw oxidizing. Piv txwv li, nyob rau hauv zus tau tej cov xim thiab coatings, barium sulphate yuav pab tiv thaiv lub hauv paus substrate los ntawm oxidation thiab corrosion, ncua lub neej ntawm cov txheej.

4. Tshuaj Inertness

Precipitated barium sulphate yog tshuaj inert, txhais tau tias nws tsis hnov ​​​​mob nrog rau feem ntau lwm yam tshuaj. Nws tsis yog - tshuaj lom, tsis yog -flammable, thiab tsis muaj tshuaj lom neeg cov tshuaj tiv thaiv nrog cov organic lossis inorganic compounds nyob rau hauv ib txwm muaj.

Cov tshuaj inertness no ua rau nws muaj ntau yam additive nyob rau hauv ntau yam lag luam. Hauv kev lag luam kws tshuaj, piv txwv li, barium sulphate yog siv los ua tus neeg sawv cev sib txawv hauv X-ray duab vim nws muaj peev xwm nqus X-rays thiab muab cov duab meej ntawm lub plab zom mov. Nws qhov xwm txheej tsis zoo ua kom ntseeg tau tias nws tsis cuam tshuam nrog lub cev cov ntaub so ntswg lossis tshuaj, txo qis kev pheej hmoo ntawm kev tsis zoo.

1. Xim thiab Txheej

Hauv kev lag luam xim thiab coatings, precipitated barium sulphate yog siv los ua tus muab tub lim thiab txuas ntxiv. Nws cov khoom siv tshuaj lom neeg ruaj khov, xws li tiv thaiv cov kua qaub, cov hauv paus, thiab oxidation, ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev txhim kho cov kav ntev thiab kev ua haujlwm ntawm cov txheej.

Barium sulphate tuaj yeem txhim kho lub zog zais, gloss, thiab huab cua tsis kam ntawm cov xim, nrog rau txo tus nqi ntawm cov khoom los ntawm kev hloov cov pigments kim dua. Nws kuj pab txhim kho cov adhesion ntawm txheej rau lub substrate thiab muab ib tug du thiab uniform deg tiav.

2. Cov yas thiab roj hmab

Precipitated barium sulphate yog dav siv nyob rau hauv plastics thiab roj hmab industries ua ib tug muab tub lim thiab reinforcing neeg sawv cev. Nws cov thermal stability thiab chemical inertness ua rau nws haum rau siv nyob rau hauv ntau yam yas thiab roj hmab khoom, xws li PVC, PE, PP, thiab roj hmab log tsheb.

Hauv cov yas, barium sulphate tuaj yeem txhim kho cov khoom siv kho tshuab, xws li txhav, lub zog, thiab kev cuam tshuam, ntawm cov khoom siv. Nws kuj tseem pab txo qis shrinkage thiab warping ntawm cov khoom yas thaum lub sij hawm molding txheej txheem. Nyob rau hauv cov roj hmab, barium sulphate tuaj yeem txhim kho kev puas tsuaj, tsim kua muag lub zog, thiab kev laus ua haujlwm ntawm cov roj hmab compound.

3. Printing Inks

Nyob rau hauv kev lag luam luam ntawv inks, precipitated barium sulphate yog siv los ua ib tug muab tub lim thiab extender los txhim kho cov printability thiab zoo ntawm tus number case. Nws cov khoom ruaj khov tshuaj xyuas kom meej tias tus number case tseem ruaj khov thiab zoo ib yam thaum lub sijhawm luam ntawv, tsis muaj kev cuam tshuam tshuaj lom neeg lossis kev hloov pauv hauv cov khoom.

Barium sulphate kuj tseem tuaj yeem txhim kho qhov opacity, ci ntsa iab, thiab xim lub zog ntawm tus number case, nrog rau kev txhim kho cov adhesion ntawm tus number case rau luam ntawv substrate. Nws yog feem ntau siv rau hauv siab - cov ntawv luam ntawv zoo, xws li cov ntawv sau gravure, flexographic inks, thiab offset inks.

4. Pharmaceuticals

Raws li tau hais ua ntej, precipitated barium sulphate yog siv los ua tus neeg sawv cev sib txawv hauv X-ray duab hauv kev lag luam kws tshuaj. Nws cov tshuaj tsis muaj zog thiab muaj peev xwm nqus tau X-rays ua rau nws muaj kev nyab xeeb thiab muaj txiaj ntsig zoo rau kev pom lub plab zom mov.

Barium sulphate feem ntau yog siv rau qhov ncauj lossis qhov quav hauv daim ntawv ntawm kev ncua lossis muab tshuaj. Nws coats sab hauv ntawm lub plab zom mov, tso cai rau X-ray qhia txog tej yam txawv txav lossis kab mob. Nws tsis yog-tshuaj lom neeg ua kom paub tseeb tias nws tsis ua rau muaj kev phom sij rau tus neeg mob, ua rau nws siv dav hauv kev tshuaj ntsuam xyuas cov tshuaj.

Hauv kev xaus, precipitated barium sulphate muaj cov khoom tshwj xeeb ntawm cov tshuaj lom neeg ruaj khov uas ua rau nws muaj txiaj ntsig thiab ntau yam khoom siv hauv ntau yam lag luam. Nws tsis kam mus rau acids, bases, oxidation, thiab nws cov tshuaj inertness pab rau nws zoo heev kev ua tau zoo thiab durability nyob rau hauv ib tug ntau yam ntawm kev siv.

Raws li tus neeg muag khoom ntawm [cov khoom npe], peb tau cog lus los muab siab - zoo precipitated barium sulphate uas ua tau raws li cov qauv kev lag luam nruj tshaj plaws. PebPrecipitated Barium Sulphate 1250 Meshyog ua tib zoo tsim los xyuas kom meej qhov zoo thiab kev ua tau zoo.

Yog tias koj xav paub ntxiv txog peb cov khoom siv precipitated barium sulphate los yog xav tham txog koj cov kev cai tshwj xeeb, thov tsis txhob yig tiv tauj peb. Peb pab pawg kws tshaj lij tau npaj los pab koj txog koj cov kev xav tau ntawm kev yuav khoom thiab muab cov kev daws teeb meem zoo tshaj plaws rau koj daim ntawv thov.

Cov ntaub ntawv

• Kirk-Othmer Encyclopedia of Chemical Technology.
• Ullmann's Encyclopedia of Industrial Chemistry.
• Phau ntawv ntawm Inorganic Chemicals.