Cellulose ethers ntawm phab ntsa putty

Cellulose ether (hydroxypropyl methylcellulose, HPMC luv luv) yog ib qho kev sib xyaw ua ke rau lub tsev sab hauv phab ntsa putty thiab plays lub luag haujlwm tseem ceeb hauv putty. HPMC nrog cov viscosities sib txawv muaj qhov cuam tshuam zoo rau kev ua haujlwm ntawm putty. Daim ntawv no tau kawm txog cov teebmeem thiab kev cai lij choj ntawm cov viscosities sib txawv ntawm HPMC thiab nws qhov ntau npaum li cas ntawm kev ua haujlwm ntawm putty, thiab txiav txim siab qhov zoo tshaj plaws viscosity thiab ntau npaum li cas ntawm HPMC hauv putty.

Cov lus tseem ceeb: cellulose ether, viscosity, putty, kev ua tau zoo

0.Ua ntej

Nrog rau txoj kev loj hlob ntawm tib neeg, tib neeg muaj kev xav ntau dua los nyob hauv ib qho chaw zoo hauv tsev. Nyob rau hauv tus txheej txheem ntawm kev kho kom zoo nkauj, thaj chaw loj ntawm cov phab ntsa yuav tsum tau muab khawb thiab ua kom zoo nrog putty los sau qhov. Putty yog ib qho tseem ceeb heev txhawb cov khoom kho kom zoo nkauj. Kev kho lub hauv paus tsis zoo yuav ua rau muaj teeb meem xws li tawg thiab tev ntawm cov xim txheej. Siv cov khoom pov tseg thiab cov ntxhia ntxeem tau nrog cov huab cua huv huv los kawm txog lub tsev tshiab kev tiv thaiv ib puag ncig putty tau dhau los ua lub ntsiab lus kub. Hydroxypropyl methyl cellulose (Hydroxypropyl methyl cellulose, lus Askiv abbreviation yog HPMC) yog cov dej-soluble polymer khoom p, raws li feem ntau siv admixture rau kev tsim kho putty, nws muaj dej tuav kev ua tau zoo, ncua sij hawm ua hauj lwm thiab txhim kho kev tsim kho, txhim kho kev ua hauj lwm efficiency. . Raws li kev tshawb nrhiav yav dhau los, daim ntawv no tau npaj ib hom kev tiv thaiv sab hauv phab ntsa ib puag ncig putty nrog diatomite ua lub luag haujlwm tseem ceeb muab tub lim, thiab ua tib zoo kawm txog qhov sib txawv ntawm viscosity HPMC thiab tus nqi ntawm putty ntawm putty cov dej tsis kam, lub zog sib txuas, pib. drying crack resistance, sib tsoo Influence of workability, workability and deg dry time.

1. Kev sim ib feem

1.1 Ntsuas cov khoom siv raw thiab cov cuab yeej siv

1.1.1 Cov khoom siv raw

4 W—HPMC, 10 W—HPMC, thiab 20 W—HPMC cellulose ether thiab polyvinyl cawv roj hmab hmoov siv nyob rau hauv qhov kev xeem yog muab los ntawm Kima Chemical Co., Ltd; diatomite yog muab los ntawm Jilin Diatomite Company; hnyav calcium thiab talcum hmoov Muab los ntawm Shenyang SF Industrial Group; 32.5 R dawb Portland cement yog muab los ntawm Yatai Cement Company.

1.1.2 Cov khoom siv kuaj

Cement fluidity tester NLD-3; pib ziab khaub ncaws tiv thaiv kev sib tsoo BGD 597; ntse daim ntawv cog lus lub zog tester HC-6000 C; sib tov thiab xuab zeb dispersing ntau lub hom phiaj BGD 750.

1.2 Kev sim txoj kev

Cov qauv hauv paus ntawm kev sim, uas yog, cov ntsiab lus ntawm cov cement, hnyav calcium, diatomite, talcum hmoov thiab polyvinyl cawv yog 40%, 20%, 30%, 6% thiab 4% ntawm tag nrho cov khoom ntawm cov hmoov putty, feem. . Cov koob tshuaj ntawm HPMC nrog peb qhov sib txawv viscosities yog 1‰, 2‰, 3‰, 4‰thiab 5‰raws. Rau qhov yooj yim ntawm kev sib piv, lub thickness ntawm putty ib leeg-pass tsim yog tswj ntawm 2 hli, thiab expansion degree yog tswj ntawm 170 hli mus rau 180 hli. Cov ntsuas ntsuas yog thawj zaug ziab tawg tsis kam, daim ntawv cog lus lub zog, dej tsis kam, cov khoom siv xuab zeb, ua haujlwm tau zoo thiab lub sijhawm qhuav.

2. Cov qhabnias xeem thiab kev sib tham

2.1 Qhov cuam tshuam ntawm qhov sib txawv ntawm viscosities ntawm HPMC thiab nws qhov ntau npaum li cas ntawm daim ntawv cog lus lub zog ntawm putty

Los ntawm cov txiaj ntsig kev xeem thiab daim ntawv cog lus lub zog nkhaus ntawm cov viscosities sib txawv ntawm HPMC thiab nws cov ntsiab lus ntawm lub putty's daim ntawv cog lus lub zog, nws yuav pom tau hais tias lub putty's daim ntawv cog lus lub zog nce ua ntej thiab tom qab ntawd txo qis nrog qhov nce ntawm HPMC cov ntsiab lus. Lub zog ntawm putty muaj qhov cuam tshuam loj tshaj plaws, uas nce ntawm 0.39 MPa thaum cov ntsiab lus yog 1‰rau 0.48 MPa thaum cov ntsiab lus yog 3‰. Qhov no yog vim hais tias thaum HPMC dispersed rau hauv dej, cov cellulose ether nyob rau hauv cov dej swells sai heev thiab fuses nrog cov roj hmab hmoov, interlaced nrog ib leeg, thiab cov cement hydration khoom yog surrounded los ntawm cov polymer zaj duab xis los tsim ib tug composite matrix theem, uas ua putty daim ntawv cog lus Lub zog nce, tab sis thaum tus nqi ntawm HPMC loj dhau los yog cov viscosity siab dhau los yog tsawg dhau, cov yeeb yaj kiab polymer tsim los ntawm HPMC thiab cov cement particles muaj cov nyhuv sealing, uas txo cov kev sib raug zoo ntawm putty.

2.2 Cov teebmeem ntawm cov viscosities sib txawv ntawm HPMC thiab nws cov ntsiab lus ntawm lub sijhawm qhuav ntawm putty

Nws tuaj yeem pom los ntawm cov txiaj ntsig ntawm qhov sib txawv ntawm cov viscosities ntawm HPMC thiab nws qhov ntau npaum li cas ntawm lub sijhawm ziab ntawm lub tshuab ziab khaub ncaws thiab lub sijhawm ziab khaub ncaws. Qhov ntau dua qhov viscosity ntawm HPMC thiab qhov ntau npaum li cas, lub sij hawm ntev ntawm qhov ziab ntawm lub putty. /T298—2010), lub sijhawm qhuav ntawm cov phab ntsa sab hauv yuav tsum tsis pub tshaj 120 min, thiab thaum cov ntsiab lus ntawm 10 W—HPMC tshaj 4‰, thiab cov ntsiab lus ntawm 20 W—HPMC tshaj 3‰, lub sij hawm deg qhuav ntawm lub putty tshaj qhov specification yuav tsum tau. Qhov no yog vim HPMC muaj cov dej tuav tau zoo. Thaum HPMC muab sib xyaw rau hauv lub putty, cov dej molecules thiab pawg hydrophilic ntawm cov qauv molecular ntawm HPMC tuaj yeem sib xyaw ua ke los qhia cov npuas me me. Cov npuas no muaj cov nyhuv "cov menyuam", uas muaj txiaj ntsig zoo rau lub putty batching Tom qab lub putty hardened, qee cov pa npuas tseem muaj nyob rau hauv kev ywj pheej pores, uas tiv thaiv cov dej los ntawm evaporating sai heev thiab prolongs lub nto qhuav lub sij hawm ntawm lub putty. Thiab thaum HPMC muab sib xyaw rau hauv lub putty, cov khoom hydration xws li calcium hydroxide thiab CSH gel nyob rau hauv cov cement yog adsorbed nrog HPMC molecules, uas ua rau kom cov viscosity ntawm pore tov, txo qhov kev txav ntawm ions hauv pore tov, thiab ntxiv qeeb. cov txheej txheem cement hydration.

2.3 Qhov cuam tshuam ntawm cov viscosities sib txawv ntawm HPMC thiab nws qhov ntau npaum li cas ntawm lwm yam khoom ntawm putty

Nws tuaj yeem pom los ntawm cov txiaj ntsig kev xeem ntawm kev cuam tshuam ntawm cov viscosities sib txawv ntawm HPMC thiab tus nqi ntawm cov putty ntawm lwm yam khoom ntawm putty. Qhov sib ntxiv ntawm HPMC nrog cov viscosities sib txawv ua rau thawj zaug ziab tawg tsis kam, dej tsis kam thiab xuab zeb kev ua haujlwm ntawm putty txhua yam, tab sis nrog qhov nce ntawm HPMC, kev tsim kho tsis zoo. Vim tias cov nyhuv thickening ntawm HPMC, cov ntsiab lus ntau dhau yuav ua rau muaj qhov sib xws ntawm putty, uas yuav ua rau nws nyuaj rau khawb lub putty thiab deteriorate kev tsim kho.

3. Cov lus xaus

(1) Lub zog cohesive ntawm putty nce ua ntej thiab tom qab ntawd txo qis nrog qhov nce ntawm HPMC cov ntsiab lus, thiab lub zog cohesive ntawm putty feem ntau cuam tshuam thaum cov ntsiab lus ntawm 10 W-HPMC yog 3‰.

(2) Qhov ntau dua qhov viscosity ntawm HPMC thiab cov ntsiab lus ntau dua, lub sij hawm ziab ntawm lub putty ntev dua. Thaum cov ntsiab lus ntawm 10 W-HPMC tshaj 4‰, thiab cov ntsiab lus ntawm 20 W-HPMC tshaj 3‰, lub sij hawm deg ziab ntawm lub putty yog ntev heev thiab tsis ua raws li tus qauv. Xav tau.

(3) Ntxiv cov viscosities sib txawv ntawm HPMC ua rau thawj zaug ziab tawg tsis kam, dej tsis kam thiab sanding kev ua tau zoo ntawm putty ib txwm, tab sis nrog kev nce ntawm nws cov ntsiab lus, kev tsim kho kev ua tau zoo zuj zus. Xav paub ntau ntxiv, qhov kev ua tau zoo ntawm putty tov nrog 3‰10 W-HPMC yog qhov zoo tshaj plaws.