Cellulose bụ polysaccharide nke na-emepụta ether dị iche iche na-agbaze mmiri. Cellulose thickeners bụ nonionic mmiri soluble polymers. Akụkọ ihe mere eme ya dị ogologo, karịa afọ 30, enwere ọtụtụ ụdị. A ka na-eji ha n'ihe fọrọ nke nta ka ọ bụrụ ihe osise latex niile ma bụrụ isi ihe na-emepụta ihe. Cellulosic thickeners na-arụ ọrụ nke ọma na aqueous sistem n'ihi na ha na-eme ka mmiri n'onwe ha. Na agba agba, cellulose thickeners a na-ejikarị bụ: methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) na hydrophobically modified hydroxyethyl cellulose (HPC). HMHEC). HEC bụ polysaccharide na-agbaze mmiri nke a na-ejikarị eme ihe n'ịgba akwa matt na ọkara gloss architectural latex. Thickeners dị na dị iche iche viscosity akara ule na thickeners na a cellulose nwere magburu onwe agba ndakọrịta na nchekwa nkwụsi ike.
Nhazi ọkwa, mgbochi ịgbasa, ihe na-emepụta ihe nkiri na ihe mgbochi nke ihe nkiri mkpuchi na-adabere na ịdị arọ molekụla nke HEC. HEC na ndị ọzọ na-abụghị ndị na-ejikọta mmiri na-eme ka mmiri na-edozi mmiri na-eme ka akụkụ mmiri nke mkpuchi ahụ dịkwuo elu. Enwere ike iji thickeners cellulose naanị ma ọ bụ jikọtara ya na ndị ọzọ na-esi ísì ụtọ iji nweta rheology pụrụ iche. Cellulose ethers nwere ike inwe dị iche iche ikwu molekul arọ na dị iche iche viscosity akara ule, sitere na a ala molekul arọ 2% aqueous ngwọta na a viscosity nke banyere 10 MPS na a elu ikwu molekụla arọ viscosity nke 100 000 MP.S. A na-ejikarị akara ule dị ala dị ala dị ka colloid nchebe na latex paint emulsion polymerization, na akara ule ndị a na-ahụkarị (viscosity 4 800-50 000 MP·S) ka a na-eji dị ka ndị na-ekpo ọkụ. Usoro nke ụdị thickener a bụ n'ihi nnukwu hydration nke njikọ hydrogen na njikọ dị n'etiti ụdọ molekụla ya.
Cellulose ọdịnala bụ polymer arọ molekụla dị elu nke na-agbakọ tumadi site na njikọ dị n'etiti agbụ molekụla. N'ihi nnukwu viscosity na ọnụ ala dị ala, ihe na-edozi ahụ adịghị mma, ọ na-emetụtakwa gloss nke ihe nkiri mkpuchi. N'elu ọnụ ọgụgụ dị elu, viscosity dị ala, nkwụsị nkwụsị nke ihe nkiri mkpuchi adịghị mma, na njupụta nke ihe mkpuchi mkpuchi adịghị mma. Njirimara ngwa nke HEC, dị ka nguzogide ahịhịa, ịse foto na ihe mkpuchi rola, nwere njikọ na nhọrọ nke thickener. Ọzọkwa ya eruba Njirimara dị ka larịị na sag iguzogide na-n'ụzọ dị ukwuu emetụta thickeners.
Hydrophobically modified cellulose (HMHEC) bụ cellulose thickener nwere hydrophobic mgbanwe na ụfọdụ branched agbụ (ọtụtụ ogologo agbụ alkyl otu na-ewebata n'akụkụ isi yinye nke Ọdịdị). Nke a mkpuchi nwere elu viscosity na elu shiee ọnụego ya mere mma film e guzobere. Dị ka Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Mmetụta ya na-akpụ akpụ yiri nke cellulose ether thickeners nwere nnukwu ihe ikwu molekul. Ọ na-eme ka viscosity na ọkwa nke ICI dịkwuo mma, ma na-ebelata esemokwu elu. Dị ka ihe atụ, elu esemokwu nke HEC bụ banyere 67 MN / m, na elu esemokwu nke HMHEC bụ 55 ~ 65 MN / m.
HMHEC nwere ọmarịcha sprayability, mgbochi sagging, ihe nrịbawanye, ezigbo gloss na mgbochi pigmenti. A na-eji ya n'ọtụtụ ebe na enweghị mmetụta na-adịghị mma na nhazi ihe nkiri nke ihe osise dị mma nke nha latex. Ọmarịcha ihe nkiri na-emepụta ihe na arụmọrụ mgbochi corrosion. Nke a na-arụkọ ọrụ ọnụ na-arụ ọrụ nke ọma na sistemụ vinyl acetate copolymer, yana arụmọrụ ya dị ka ihe ndị ọzọ na-emekọ ihe, mana yana usoro dị mfe.
Oge nzipu: Mar-16-2023