Action Mechanism na Common Retarders

(Action Mechanism of Common Retarders)

Action manufa na retarders

1. Rage solubility na hemihydrate gypsum.

2. Rage yawan narkewar gypsum hemihydrate.

3. Retarding ions suna adsorbed a saman dihydrate gypsum crystal, kuma waɗannan ions suna haɗuwa a cikin lattice.

4. Samar da hadaddun don taƙaita yaduwar ions kusa da gypsum crystal dihydrate.

Common retarders

1. Organic acid da gishiri masu narkewa: citric acid, tartaric acid, malic acid, da sauransu.

2. Alkaline phosphate: sodium tripolyphosphate.

3. Sunadaran: manne kashi, ƙasƙantar da sunadarai, amino acid polymerized.

4. Haɗa nau'ikan retarders daban-daban.

Retarding inji na citric acid

Citric acid shi ne ternary Organic acid dauke da hydroxyl kungiyar, wanda ionizes H + da da yawa irin acid ions karkashin yanayi daban-daban, wanda samar daban-daban barga precipitates tare da alli. Daga cikin su, kwanciyar hankali na hadaddun shine mafi girma lokacin da darajar PH ta kasance 8.5, don haka lokacin saiti shine mafi tsawo.

Retarding inji na sodium polyphosphate.

Sodium polyphosphate shine madaidaiciyar sarkar trimer, wanda ke haɗuwa tare da ions alli a cikin ruwa lokaci don samar da calcium phosphate maras narkewa wanda ke rufe saman hemihydrate gypsum, wanda ke hana rushewar ta, don haka yana rage girman supersaturation da rage yiwuwar nucleation na dihydrate gypsum crystal.

A lokaci guda, adsorption na sodium tripolyphosphate a kan crystal tsakiya surface na dihydrate gypsum rage da surface makamashi na crystal tsakiya, ƙara da nucleation shãmaki, da kuma tsawaita lokacin da crystal tsakiya don isa ga m nucleation size, wanda aka macroscopically halin da tsawaita lokacin shigar da lokaci na gypsum.

Retarding inji na sunadaran

An gano cewa macromolecular retarders (proteins) suna gauraye a cikin kayan tushen gypsum, hade da calcium ions a saman dihydrate gypsum, rufe crystal tsakiya surface na dihydrate gypsum, da kuma rage crystal tsakiya surface iya hana ci gaban crystal tsakiya.

A lokaci guda, saboda adsorption da kariyar furotin colloid, furotin colloid yana hana ci gaban crystal na gypsum, amma ba ya canza yanayin halittar crystal, kuma yana da ɗan tasiri akan ƙarfin gypsum.

Summary

1. A karkashin wannan sashi, sakamakon retarding na citric acid shine mafi karfi. Lokacin da abun ciki ya fi 0.2%, lokacin jinkirta ba zato ba tsammani ya karu sosai, kuma lokacin da adadin ya kasance 0.3%, lokacin jinkirta ya kai fiye da sa'o'i 8, wanda ya kusan cimma sakamakon hana gypsum daga saitin.

2. Abubuwan da ke cikin sodium polyphosphate shine 0.1%, kuma tasirin jinkirta ba a bayyane yake ba, sa'an nan kuma lokaci ya karu ba zato ba tsammani tare da karuwar adadin polyphosphate, wanda ke da wuyar sarrafawa lokacin amfani.

3. Akwai dangantaka ta layi tsakanin lokacin jinkirtawa da abun ciki na furotin retarders, wanda ke da amfani ga sarrafa aiki.

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(Action Mechanism of Common Retarders)