Focus on Cellulose ethers

Kodi gypsum plaster formula ndi chiyani?

Musanadziwe kuchuluka kwa gypsum retarder, ndikofunikira kuyesa ufa wa gypsum yaiwisi wogulidwa. Mwachitsanzo, yesani nthawi yoyamba ndi yomaliza yokonzekera ufa wa gypsum, kumwa madzi wokhazikika (ndiko kuti, kusasinthasintha), ndi mphamvu yopondereza. Ngati n'kotheka, ndi bwino kuyesa zomwe zili mu madzi a II, theka-madzi ndi gypsum anhydrous mu gypsum powder. Choyamba muyese zizindikiro za ufa wa gypsum molondola, ndiyeno mudziwe kuchuluka kwa gypsum retarder malinga ndi kutalika kwa nthawi yoyamba ya gypsum powder, chiwerengero cha ufa wa gypsum mu matope ofunikira komanso nthawi yogwiritsira ntchito matope a gypsum .

Kuchuluka kwa gypsum retarder kumagwirizana kwambiri ndi ufa wa gypsum: ngati nthawi yoyamba yoyika gypsum powder ndi yochepa, chiwerengero cha retarder chiyenera kukhala chachikulu; ngati nthawi yoyamba yoyika ufa wa gypsum ndi yayitali, kuchuluka kwa retarder kuyenera kukhala kochepa. Ngati gawo la ufa wa gypsum mu matope a gypsum ndi lalikulu, retarder yowonjezera iyenera kuwonjezeredwa, ndipo ngati gawo la gypsum powder ndi laling'ono, gawo la ufa wa gypsum liyenera kukhala lochepa. Ngati nthawi yogwiritsira ntchito matope a gypsum ndi yaitali, retarder yowonjezera iyenera kuwonjezeredwa, apo ayi, ngati nthawi yogwiritsira ntchito matope a gypsum ndi yaifupi, retarder yochepa iyenera kuwonjezeredwa. Ngati nthawi ya opareshoni ndi yayitali kwambiri pambuyo poti matope a gypsum awonjezeredwa ndi retarder, ndikofunikira kuchepetsa kuchuluka kwa gypsum retarder. Ngati nthawi yogwira ntchito ndi yochepa, kuchuluka kwa retarder kuyenera kuwonjezeka. Sitikunena kuti kuwonjezera kwa gypsum retarder ndi static.

Gypsum ikalowa mufakitale, zitsanzo zingapo ziyenera kutengedwa kuti ziyese zizindikiro zake zosiyanasiyana. Ndi bwino kuyesa ndi kuyesa masiku angapo, chifukwa ndi nthawi yosungiramo ufa wa gypsum, zizindikiro zake zosiyanasiyana zikusintha. Chinthu chodziwikiratu ndi chakuti ufa wa gypsum utakula kwa nthawi yoyenera, nthawi yake yoyamba ndi yomaliza idzakhalanso yaitali. Panthawiyi, kuchuluka kwa gypsum retarder kudzachepetsedwa, mwinamwake nthawi yogwiritsira ntchito matope a gypsum idzakulitsidwa kwambiri ndikuwonjezeka. Imachepetsa ndalama zopangira pamene ikukhudza kugwira ntchito kwake ndi mphamvu zake zomaliza.

Mwachitsanzo, ngati mutagula gulu la phosphogypsum, nthawi yoyamba yokhazikitsa ndi mphindi 5-6, ndipo kupanga matope olemera a gypsum ndi awa:

Gypsum ufa - 300 kg

Mchenga wotsuka - 650 kg

unga wa talc - 50 kg

Gypsum retarder - 0,8 kg

HPMC - 1.5 makilogalamu

Kumayambiriro kwa kupanga, 0,8 kg ya gypsum retarder inawonjezeredwa, ndipo nthawi yogwiritsira ntchito matope a gypsum inali mphindi 60-70. Pambuyo pake, chifukwa cha zifukwa pa malo omangawo, malo omangawo anatsekedwa ndipo ntchito inayimitsidwa, ndipo mtanda wa gypsum ufa wasungidwa popanda ntchito. Malo omangawo atayambiranso mu Seputembala, kuwonjezera kwa 0,8 kg ya retarder idawonjezeredwa pomwe matope a gypsum adapangidwanso. Mtondowo sunayesedwe pafakitale, ndipo sunalimbabe patatha maola 24 kuchokera pamene unatumizidwa kumalo omanga. Malo omangawo anachitapo kanthu mwamphamvu. Popeza wopanga adalowa m'makampaniwa posachedwa, sanapeze chifukwa chake, ndipo adada nkhawa kwambiri. Panthawiyi, ndinaitanidwa kuti ndipite kwa opanga matope a gypsum kuti ndidziwe chifukwa chake. Pambuyo popita ku sitepe yoyamba, nthawi yoyamba yokonzekera ufa wa gypsum inayesedwa, ndipo zinapezeka kuti nthawi yoyamba ya ufa wa gypsum idakulitsidwa kuchokera ku nthawi yoyambirira ya 5-6 mphindi mpaka mphindi 20, ndipo kuchuluka kwa gypsum retarder sikunachepe. , kotero chodabwitsa chomwe chili pamwambachi chikuchitika. Pambuyo pa kusintha, mlingo wa gypsum retarder unachepetsedwa kufika 0,2 kg, ndipo nthawi yogwiritsira ntchito matope a gypsum inafupikitsidwa mpaka mphindi 60-70, zomwe zinakhutiritsa malo omanga.

Kuphatikiza apo, chiŵerengero cha zowonjezera zosiyanasiyana mu matope a gypsum chiyenera kukhala choyenera. Mwachitsanzo, nthawi yogwiritsira ntchito matope a gypsum ndi mphindi 70, ndipo kuchuluka koyenera kwa gypsum retarder kumawonjezeredwa. Zolondola, ngati matope ochepa a gypsum akuwonjezeredwa, kuchuluka kwa madzi osungira madzi kumakhala kochepa, ndipo nthawi yosungira madzi ndi yocheperapo mphindi 70, zomwe zimapangitsa kuti pamwamba pa matope a gypsum atayike madzi mofulumira, pamwamba pake ndi youma, ndi kuchepa kwa madzi. matope a gypsum ndi osagwirizana. Panthawi imeneyi, matope a gypsum adzataya madzi. kusweka.

Mapangidwe awiri a gypsum plaster akulimbikitsidwa pansipa:

1. heavy gypsum pulasitala matope chilinganizo

Gypsum ufa (nthawi yokhazikitsa nthawi 5-6 mphindi) - 300 kg

Mchenga wotsuka - 650 kg

unga wa talc - 50 kg

Gypsum retarder - 0,8 kg

Cellulose ether HPMC(80,000-100,000 cps)—1.5kg

mafuta a Thixotropic - 0,5 kg

Nthawi yogwiritsira ntchito ndi mphindi 60-70, madzi osungira madzi ndi 96%, ndipo chiwerengero cha madzi osungira madzi ndi 75%.

2 .wopepuka gypsum pulasitala matope chilinganizo

Gypsum ufa (nthawi yokhazikitsa nthawi 5-6 mphindi) - 850 kg

Mchenga wotsuka - 100 kg

unga wa talc - 50 kg

Gypsum retarder - 1.5 kg

Selulosi etha HPMC (40,000-60,000)—2.5 kg

mafuta a Thixotropic - 1 kg

Vitrified mikanda - 1 kiyubiki


Nthawi yotumiza: Dec-08-2022
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