Vim nws cov yam ntxwv hydration thiab cov qauv ntawm lub cev, gypsum yog cov khoom siv hauv tsev zoo heev thiab feem ntau siv dav hauv kev lag luam kho kom zoo nkauj hauv tsev thiab txawv teb chaws. Txawm li cas los xij, txij li gypsum teeb thiab hardens sai heev, lub sijhawm ua haujlwm feem ntau yog 3 mus rau 30 feeb, uas yooj yim los txwv kev siv gypsum. Yog li ntawd, nws yog ib qho tseem ceeb tshwj xeeb los ntxiv gypsum retarder.
Thaum lub sij hawm retarder hloov lub sij hawm retarding ntawm gypsum, nws kuj zoo heev puas lub zog.
Qhov zoo ntawm gypsum retarder:
Ntxiv cov nyiaj tsawg, lub sij hawm rov qab ntev dua
Siab hardness tom qab coagulation, non-toxic, tasteless thiab ntau tus phooj ywg environmentally
1. Ua ntej sib tov siv gypsum hmoov nrog retarder, Yuhe hydroxypropyl methylcellulose los yog lwm yam additives tusyees, ces ntxiv xuab zeb, hnyav calcium, thiab lwm yam, ntxiv xuab zeb los yog hnyav calcium thiab do rau 15 feeb ua ntej tso. (Ceeb Toom: Vim muaj qhov sib txawv ntawm qhov sib txawv ntawm cov ntaub ntawv, yuav muaj stratification tom qab lub sij hawm ntev stirring, uas yuav cuam tshuam rau cov khoom zoo.)
2. Rau lwm yam khoom, xws li pwm gypsum thiab retarded gel dej, koj tuaj yeem muab cov retarder tso rau hauv dej ua ntej, thiab tom qab ntawd ntxiv rau siv tom qab dissolving.
Kev tsim qauv ntawm cov khoom siv gypsum
Stucco plaster theem qis:
Pure gypsum hmoov 300 kg
700 kg zoo dej xuab zeb
Hydroxypropyl methylcellulose 0.5-0.7 kg
Gypsum retarder 0.8-1 kg
Adhesive plaster (slow drying type):
Pure gypsum hmoov 800 kg
Hnyav calcium hmoov 200 kg
Hydroxypropyl methylcellulose 2.5 kg
Retarder 2.5 kg
Xim plaster tiav (gypsum putty):
Pure gypsum hmoov 500-700 kg
Hnyav calcium hmoov 300-500 kg
Hydroxypropyl methylcellulose 2-2.5 kg
Gypsum retarder 1.5-2.1 kg
plaster txheej:
700 kg ntawm ntshiab gypsum hmoov
Hnyav calcium hmoov 300 kg
Hydroxypropyl Cellulose 2.5 kg
Dispersible latex hmoov 2kg
Gypsum retarder 2 kg
Post lub sij hawm: Apr-14-2023