Tom qab alkali kev kho mob ntawm refined paj rwb, cellulose ether yog npaj los ntawm ib tug series ntawm cov tshuaj tiv thaiv nrog methyl chloride ua etherifying tus neeg sawv cev. Feem ntau, qhov kev hloov pauv yog 1.6 ~ 2. Nws belongs rau non-ionic cellulose ether.
1. Methylcellulose yog soluble hauv dej txias, tab sis nws nyuaj rau yaj hauv dej kub. Nws cov tshuaj aqueous yog ruaj khov nyob rau hauv thaj tsam ntawm pH =3-12. Nws muaj kev sib raug zoo nrog cov hmoov txhuv nplej siab, cov pos hniav thiab ntau surfactants. Thaum qhov kub nce mus txog qhov kub ntawm gel, gel tshwm sim yuav tshwm sim.
2. Cov dej tuav ntawm methyl cellulose nyob ntawm nws qhov sib ntxiv, viscosity, particle loj thiab dissolution tus nqi. Feem ntau, cov dej tuav tus nqi siab yog qhov sib ntxiv loj, qhov zoo me me, thiab cov viscosity loj. Cov nyiaj ntxiv muaj qhov cuam tshuam loj tshaj plaws ntawm cov dej tuav tus nqi, thiab cov viscosity tsis ncaj qha rau cov dej tuav tus nqi. Tus nqi dissolution feem ntau yog nyob ntawm qhov kev hloov kho saum npoo thiab particle fineness ntawm cellulose hais. Ntawm cov cellulose ethers saum toj no, methyl cellulose thiab hydroxypropyl methyl cellulose muaj dej ntau dua.
3. Qhov kev hloov ntawm qhov kub thiab txias yuav cuam tshuam rau cov dej tuav ntawm methyl cellulose. Feem ntau, qhov kub thiab txias dua, qhov dej khaws cia tsis zoo. Yog hais tias qhov kub ntawm lub mortar tshaj 40 degree, cov dej tuav ntawm methyl cellulose yuav pom tseeb deteriorate, heev cuam tshuam rau lub workability ntawm lub mortar.
4. Methylcellulose muaj kev cuam tshuam rau kev ua haujlwm thiab adhesion ntawm mortar. Qhov "adhesion" ntawm no yog hais txog cov nplaum nplaum uas xav tau los ntawm cov neeg ua haujlwm ntawm cov cuab yeej thiab cov phab ntsa substrate, uas yog, shear resistance ntawm lub mortar. Cov cuab yeej nplaum yog loj, shear resistance ntawm mortar yog loj, lub zog yuav tsum tau los ntawm cov neeg ua hauj lwm nyob rau hauv tus txheej txheem ntawm kev siv kuj loj, thiab lub workability ntawm mortar yog tsis zoo. Hauv cov khoom lag luam cellulose ether, qhov adhesion ntawm methyl cellulose yog nyob rau nruab nrab.
