Cellulose bụ polysaccharide nke na-emepụta ọtụtụ ethers na-agbaze mmiri. Cellulose thickeners bụ polymers na-agbaze mmiri na-abụghị ionic. Akụkọ ihe mere eme nke ojiji ya dị ogologo, ihe karịrị afọ 30, e nwekwara ọtụtụ ụdị. A ka na-eji ha eme ihe n'ihe fọrọ nke nta ka ọ bụrụ agba latex niile ma bụrụ isi ihe ndị na-agbaze mmiri. Cellulosic thickeners dị irè nke ukwuu na sistemụ mmiri n'ihi na ha na-eme ka mmiri sie ike n'onwe ha. N'ụlọ ọrụ agba, ihe ndị na-agbaze cellulose kachasị eji bụ: methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) na hydrophobically modified hydroxyethyl cellulose (HMHEC). HEC bụ polysaccharide na-agbaze mmiri nke a na-ejikarị eme ihe n'ịkpụ agba latex matt na semi-gloss. Ndị na-agbaze mmiri dị na ọkwa viscosity dị iche iche na ihe ndị na-agbaze mmiri na cellulose a nwere ndakọrịta agba na nkwụsi ike nchekwa dị mma.
Njirimara nhazi, mgbochi mgbasa, nhazi ihe nkiri na mgbochi iwụda nke ihe mkpuchi ahụ dabere na ibu molekul dị na HEC. HEC na polima ndị ọzọ na-agbaze mmiri na-eme ka mmiri dị n'ime mkpuchi ahụ sie ike. Enwere ike iji ihe mkpuchi cellulose naanị ya ma ọ bụ jikọta ya na ihe mkpuchi ndị ọzọ iji nweta rheology pụrụ iche. Cellulose ethers nwere ike inwe ibu molekul dị iche iche na ọkwa viscosity dị iche iche, site na obere molekul dị arọ 2% mmiri mmiri nwere viscosity nke ihe dị ka 10 MPS ruo viscosity dị arọ molekul dị elu nke 100 000 MP.S. A na-ejikarị ọkwa molekul dị ala dị ka colloids nchebe na polymerization nke agba latex, a na-ejikwa ọtụtụ akara ndị a na-ahụkarị (viscosity 4 800–50 000 MP·S) dị ka ihe mkpuchi. Usoro nke ụdị ihe mkpuchi a bụ n'ihi nnukwu mmiri nke njikọ hydrogen na njikọ dị n'etiti agbụ molekul ya.
Cellulose ọdịnala bụ polima dị elu nke na-eme ka ọ sie ike site na njikọ dị n'etiti agbụ molekul. N'ihi oke viscosity na obere ọ̀tụ̀tụ̀ shea, ihe onwunwe nhazi ahụ adịghị mma, ọ na-emetụtakwa gloss nke ihe mkpuchi ahụ. N'ọkwa shea dị elu, viscosity dị ala, resistivity nke ihe mkpuchi ahụ adịghị mma, jupụta nke ihe mkpuchi ahụ adịghị mma. Njirimara ojiji nke HEC, dị ka mgbochi ahịhịa, filming na roller spatter, metụtara kpọmkwem na nhọrọ nke thickener. Ihe onwunwe mmiri ya dị ka ọkwa na resistence sag na-emetụtakarị site na thickeners.
Cellulose nke a na-agbanwe agbanwe site na Hydrophobic (HMHEC) bụ ihe na-eme ka cellulose sie ike nke nwere mgbanwe hydrophobic na ụfọdụ agbụ ígwè nwere alaka (a na-ewebata ọtụtụ otu alkyl ogologo ogologo n'akụkụ isi agbụ nke usoro ahụ). Mkpuchi a nwere viscosity dị elu na oke shear dị elu ma si otú a mee ka mmepụta ihe nkiri ka mma. Dịka Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Mmetụta ya dị ka nke cellulose ether thickeners nwere oke molekul buru ibu. Ọ na-eme ka viscosity na ọkwa nke ICI ka mma, ma na-ebelata nrụgide elu. Dịka ọmụmaatụ, nrụgide elu nke HEC dị ihe dị ka 67 MN/m, nrụgide elu nke HMHEC dịkwa 55~65 MN/m.
HMHEC nwere ezigbo ike ịgbasa ihe, igbochi ịcha, ikike nhazi, ezigbo mma na mgbochi ịcha agba. A na-eji ya eme ihe nke ukwuu, ọ nweghịkwa mmetụta ọjọọ na nhazi ihe osise nke agba latex dị obere. Ọ na-arụ ọrụ nke ọma na arụmọrụ mgbochi ire ere. Ihe mkpuchi a na-ejikọ ọnụ na-arụ ọrụ nke ọma na sistemụ vinyl acetate copolymer, arụmọrụ ya dịkwa ka ihe mkpuchi ndị ọzọ na-ejikọ ọnụ, mana ọ na-eji usoro dị mfe.
Oge ozi: Maachị-16-2023