Dab tsi yog cov khoom ntawm carboxymethyl cellulose?

Dab tsi yog cov khoom ntawm carboxymethyl cellulose?

Teb: Carboxymethyl cellulose tseem muaj cov khoom sib txawv vim nws qib sib txawv ntawm kev hloov chaw. Cov qib degree hloov chaw, tseem hu ua kev kawm txog etherification, txhais tau tias muaj cov pab pawg h hauv peb pawg hydroxyl hloov los ntawm ch2coona. Thaum peb pawg neeg hydroxyl ntawm lub nplhaib cellulose muaj 0.4 h hauv pawg hydroxyl hloov los ntawm Carboxymethyl, nws tuaj yeem yaj hauv dej. Nyob rau lub sijhawm no, nws yog hu ua 0.4 hloov kev ncua lossis nruab nrab hloov chaw degree (ncua sij hawm 0.4-1.2).

Cov khoom ntawm Carboxymethyl cellulose:

(1) Nws yog cov hmoov dawb (los yog coarse nplej, fibrous), tsis muaj mob hauv dej, yooj yim solarent hauv nplaum lossis me ntsis alkaline. Nws muaj cov kev tawg zoo thiab khi fais fab.

(2) nws cov kua aqueous tuaj yeem siv ua emulsifier ntawm roj / dej hom thiab dej / roj hom. Nws tseem muaj lub peev xwm emulsifying rau roj thiab siv quav ciab, thiab yog lub zog emulsifier.

(3) Thaum cov tshuaj sib ntsib hnyav hlau ntsev xws li txhuas acetate, cov roj acassium, thiab potassium dichromate, nag lossis daus tuaj yeem tshwm sim. Txawm li cas los xij, tsuas yog rau cov kev ua acetate, nws tseem tuaj yeem rov qab ua cov tshuaj sodium, thiab txhuas yog cov kev daws teeb meem hydroxide yooj yim.

(4) Thaum cov tshuaj ntsib cov organic acid thiab inorganic acol thiab nag lossis daus tuaj yeem tshwm sim. Raws li kev soj ntsuam, thaum tus nqi pH yog 2.5, cov ntshav thiab nag lossis daus tau pib. Yog li PH 2.5 tuaj yeem suav hais tias yog qhov tseem ceeb.

(5) rau cov ntsev xws li cov tshuaj calcium, cov ntawv nyeem magnesium, tsis muaj nag los, tab sis cov khoom siv viscipitation yuav raug txo kom, xws li ntxiv edta lossis phosphate thiab lwm yam tshuaj los tiv thaiv nws.

(6) ntsuas kub muaj qhov cuam tshuam zoo ntawm lub viscosity ntawm nws cov kua txiv aquees. Lub viscosity txo kev ncaj ncees thaum kub thiab kub thiab rov qab. Qhov kev ruaj ntseg ntawm lub viscosity ntawm cov kua aqueous ntawm chav sov nyob twj ywm tsis hloov pauv, tab sis cov viscosity tuaj yeem txo qis dua li 80 ° C rau lub sijhawm ntev. Feem ntau, thaum qhov ntsuas kub tsis tshaj 110 ° C, txawm tias qhov ntsuas kub kom tau 3 teev, thiab tom qab ntawd lub viscosity tseem rov qab mus rau nws thawj lub xeev; Tab sis thaum qhov kub yog rhuab rau 120 ° C rau 2 teev, txawm hais tias qhov kub tau rov qab los, lub viscosity drops los ntawm 18.9%. Cov.

(7) Tus nqi PH yuav muaj qee yam cuam tshuam ntawm lub viscosity ntawm nws cov kua aqueous. Feem ntau, thaum phot-vepcority daws teeb meem, nws viscosity muaj cov nyhuv me me, thaum nws parscosity pib txo qis zuj zus; Yog tias cov kab mob siab ntawm lub siab-viscosity daws los ntawm nruab nrab, nws viscosity yuav poob. Kev poob qis.

(8) sib xws nrog lwm cov kua dej-soluble ci, softers thiab resins. Piv txwv li, nws tau tshaj cov tsiaj cov kua nplaum, cov pos hniav ntawm cov pos hniav, glycerin thiab soluble starch. Nws yog sib xws nrog dej khob, polyvinyl cawv, urea-formedehyde cob, melamine-formaldehyde cob, thiab lwm yam.

(9) Zaj duab xis ua los ntawm irradiating ultraviolet teeb rau 100 teev tseem tsis muaj kev sib deev lossis brittleness.

(10) Muaj peb lub piscosity nyob rau xaiv los ntawm raws li daim ntawv thov. Rau gypsum, siv nruab nrab viscosity (2% kev daws teeb meem ntawm 300-600MpAs), koj tuaj yeem siv nws hauv 2000 leejt), koj tuaj yeem siv nws hauv ntau npaum li cas yuav tsum tau qis dua.

(11) Nws cov kev ua kua aqueous ua tus retarder hauv gypsum.

(12) Cov kab mob thiab cov kab mob me tsis muaj qhov pom tseeb ntawm nws daim foos, tab sis lawv muaj cov nyhuv ntawm nws cov kua aqueous. Tom qab kev sib kis, lub viscosity yuav poob thiab mildew yuav tshwm sim. Ntxiv tus nqi tsim nyog ntawm cov tshuaj tiv thaiv ua ntej tuaj yeem tswj nws cov viscosity thiab tiv thaiv mildew ntev. Muaj cov tshuaj tiv thaiv hluav taws xob yog: me ntsis (1.2-benzisothzolin-3-ib), vlorothalonil, etc, chlorothalonil, etc, chlorotion Ntxiv cov nyiaj yog 0.05% mus rau 0.1%.

HydroxyPropyyl methylrothylulose li dej-khaws cov neeg sawv cev rau cov ntawv me me?

Teb: HydroxyPropyyl methylulose yog ib tug loj-efficiency dej-khaws tus neeg sawv cev rau gypsum cov khoom noj xis. Nrog rau kev nce ntawm cov ntsiab lus ntawm hydroxypropyl methylulose. Cov dej tuav tseg ntawm Gypsum cov khoom khov kho tau nce sai. Thaum tsis muaj dej tuav tus neeg sawv cev rau ntxiv, dej tswj kav dej ntawm Gypsum cov khoom ua kom tiav cov khoom siv yog li 68%. Thaum cov dej tuav tus neeg sawv cev yog 0.15%, dej rov qab tus nqi ntawm Gypsum cov khoom khov kho tuaj yeem ncav cuag 90.5%. Thiab cov dej tuav cia ntawm cov hauv qab plaster. Qhov ntau npaum li cas ntawm cov neeg sawv cev dej-retaining tshaj 0.2%, txuas ntxiv ntxiv rau ntau npaum li cas, thiab cov dej khaws cov khoom noj xis ntawm gypsum cov khoom siv xis yooj yim nce qeeb. Kev npaj ntawm anhydrer cov ntaub ntawv plastering. Qhov haum tshuaj ntawm hydroxypropyl methylcellulose yog 0.1% -0.15%.

Dab tsi yog qhov sib txawv ntawm cellulose txawv ntawm plaster ntawm Paris?

Teb: Ob lub cellulose cellulose thiab cov tshuaj me me tau siv cov txiaj ntsig ntawm lub cev, thiab cov roj cellulose ntau dua li cov nyhuv carboxymethyl muaj ntau dua cov nyhuv cariymes thiab txo lub zog ntawm lub plaster. Methyl cellulose yog qhov zoo tshaj plaws admixature rau gypsum xis kawm ua ke, thiab viscieting, tsuas yog qee yam muaj cov nyhuv retarding thaum cov nqi ntau. siab dua carboxymethyl cellulose. Vim li no, feem ntau gypsum composite cov ntaub ntawv siv ntawm Methyl cellulose, uas tsis tsuas yog ua rau lawv cov txiaj ntsig me me (xws li lawv cov nyhuv khaws cia thiab ua kom muaj zog). Nyob rau hauv txoj kev no, ob qho dej cia ua kev ua tau zoo ntawm Gypsum cov khoom siv xis thiab cov khoom siv xis nyob tau txhim kho, thaum tus nqi nce nyob ntawm qis tshaj plaws.