Plaub qhov cuam tshuam yooj yim hauv Cov Txheej Txheem Synthesis Ntawm Naphthalene Series High-efficiency Water Reducer

Plaub qhov kev tshwm sim hauv cov txheej txheem synthesis ntawm naphthalene series high-efficiency dej reducer

Cov khoom siv raw yooj yim rau kev sib txuas ntawm naphthalene-based high-efficiency dej reducers yog tsuas yog muaj sodium, concentrated sulfuric acid, formaldehyde thiab yoj alkali. Cov txheej txheem synthesis feem ntau suav nrog plaub theem pib cov tshuaj tiv thaiv: sulfonation cov tshuaj tiv thaiv, cov tshuaj tiv thaiv hydrolysis, cov tshuaj tiv thaiv condensation thiab cov tshuaj tiv thaiv neutralization.

1. Cov tshuaj tiv thaiv sulfonation

Lub hom phiaj ntawm sulfonation yog hloov cov hydrogen ntawm cov tshuaj tsw qab los ua ib pawg sulfonic acid. Tom qab sulfonation, hydrogen atom ncaj qha txuas nrog cov pa roj carbon atom ntawm naphthalene nucleus yog hloov los ntawm sulfonic acid pawg los tsim naphthalenesulfonic acid. Feem ntau, concentrated sulfuric acid los yog fuming sulfuric acid yog siv los ua tus neeg sawv cev sulfonating.

2. Hydrolysis cov tshuaj tiv thaiv

Cov naphthalenesulfonic acid tsis haum rau cov tshuaj tiv thaiv condensation. Yog li, cov tshuaj tiv thaiv rov qab tuaj yeem siv los tshem tawm cov pab pawg sulfonic acid, uas yog, xaiv cov xwm txheej tsim nyog rau cov tshuaj tiv thaiv hydrolysis. Cov tshuaj tiv thaiv hydrolysis feem ntau yog txo qhov kub ntawm cov reactant mus txog 120C thiab ntxiv dej.

3. Cov tshuaj tiv thaiv condensation

Feem ntau, cov tshuaj tiv thaiv uas tsis tshua muaj molecular tebchaw sib cuam tshuam los tsim cov polymers siab yog hu ua polycondensation cov tshuaj tiv thaiv, thiab nws cov khoom hu ua polycondensates. Nyob rau hauv tus txheej txheem ntawm condensation cov tshuaj tiv thaiv, qhov tsawg condensation polymers nrog txawv polycondensation degrees yog thawj condensed thiab maj condensed rau hauv siab molecular tebchaw. Cov tshuaj tiv thaiv ntawm naphthalenesulfonic acid thiab formaldehyde yog carbonyl ntxiv hloov cov tshuaj tiv thaiv.

4. Neutralization cov tshuaj tiv thaiv

Muaj ntau sulfuric acid nyob rau hauv cov txheej txheem ntawm sulfonation thiab polycondensation cov tshuaj tiv thaiv, cov residual sulfuric acid thiab hydrocarbyl carbonic acid uas ua los ntawm cov tshuaj tiv thaiv yog neutralized nrog alkali los ua ntsev nyob rau hauv lub synthesis theem.

Cov saum toj no yog plaub qhov kev cuam tshuam ntawm cov txheej txheem synthesis ntawm naphthalene-based high-efficiency water reducers, uas tam sim no tau siv dav hauv txoj kev, tunnels, hluav taws xob fais fab, kev txuag dej thiab lwm qhov chaw.