{"id":15399,"date":"2026-09-10T02:48:08","date_gmt":"2026-09-10T02:48:08","guid":{"rendered":"https:\/\/tenessy.com\/?p=15399"},"modified":"2026-09-10T02:48:10","modified_gmt":"2026-09-10T02:48:10","slug":"hec-vs-hpmc-vyber-spravneho-etheru-celulozy-pro-naterove-hmoty","status":"publish","type":"post","link":"https:\/\/tenessy.com\/cs\/hec-vs-hpmc-vyber-spravneho-etheru-celulozy-pro-naterove-hmoty\/","title":{"rendered":"HEC vs. HPMC: V\u00fdb\u011br spr\u00e1vn\u00e9ho celul\u00f3zov\u00e9ho etheru pro n\u00e1t\u011brov\u00e9 hmoty"},"content":{"rendered":"
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P\u0159i v\u00fdb\u011bru mezi HEC a HPMC pro n\u00e1t\u011brov\u00e9 hmoty je t\u0159eba zv\u00e1\u017eit t\u0159i ot\u00e1zky: jak\u00fd druh n\u00e1t\u011brov\u00e9 hmoty vyr\u00e1b\u00edte, jak\u00e9 v\u00fdkonnostn\u00ed c\u00edle mus\u00edte splnit a jak zahu\u0161\u0165ovadlo interaguje se zbytkem receptury. Hydroxyethylcelul\u00f3za (HEC) <\/u><\/a>v oblasti vodou \u0159editeln\u00fdch barev dominuje, zat\u00edmco hydroxypropylmethylcelul\u00f3za (HPMC) je standardem v cementov\u00fdch n\u00e1t\u011brech a syst\u00e9mech such\u00fdch maltov\u00fdch sm\u011bs\u00ed \u2013 a pochopen\u00ed p\u0159esn\u00fdch d\u016fvod\u016f je kl\u00ed\u010dem k v\u00fdvoji receptur bez metodou pokus\u016f a omyl\u016f.<\/p>\n\n\n\n

\u00davod<\/strong><\/h2>\n\n\n\n

Porovn\u00e1n\u00ed HEC a HPMC pat\u0159\u00ed k nej\u010dast\u011bj\u0161\u00edm ot\u00e1zk\u00e1m ohledn\u011b slo\u017een\u00ed v odv\u011btv\u00ed n\u00e1t\u011brov\u00fdch hmot a odpov\u011b\u010f z\u0159\u00eddka zn\u00ed: \u201cOboj\u00ed je vhodn\u00e9.\u201d A\u010dkoli se v obou p\u0159\u00edpadech jedn\u00e1 o ethery celul\u00f3zy, jsou optimalizov\u00e1ny pro odli\u0161n\u00e9 oblasti pou\u017eit\u00ed. HEC<\/u><\/a> je neiontov\u00e9 zahu\u0161\u0165ovadlo ur\u010den\u00e9 v\u00fdhradn\u011b pro vodnou f\u00e1zi, kter\u00e9 bylo vyvinuto pro latexov\u00e9 barvy a dodnes p\u0159edstavuje referen\u010dn\u00ed zahu\u0161\u0165ovadlo v emulzn\u00edch n\u00e1t\u011brov\u00fdch hmot\u00e1ch. HPMC je methyl-substituovan\u00fd celul\u00f3zov\u00fd ether, kter\u00fd byl vyvinut pro stavebn\u00ed chemii \u2013 zahu\u0161\u0165uje, zadr\u017euje vodu a lubrikuje cementov\u00e9 a s\u00e1drov\u00e9 syst\u00e9my a v n\u00e1t\u011brov\u00fdch hmot\u00e1ch se pou\u017e\u00edv\u00e1 pouze p\u0159\u00edle\u017eitostn\u011b.<\/p>\n\n\n\n

Struktur\u00e1ln\u00ed rozd\u00edl je jednoduch\u00fd, ale z\u00e1sadn\u00ed. V HEC jsou hydroxylov\u00e9 skupiny celul\u00f3zy nahrazeny hydroxyethylov\u00fdmi skupinami (\u2013OCH\u2082CH\u2082OH). V HPMC jsou nahrazeny kombinac\u00ed methoxy (\u2013OCH\u2083) a hydroxypropylov\u00fdch (\u2013OCH\u2082CH(OH)CH\u2083) skupin. Vzhledem k tomu, \u017ee HPMC obsahuje hydrofobn\u00ed methoxyskupiny, maj\u00ed jeho roztoky povrchov\u011b aktivn\u00ed vlastnosti, ni\u017e\u0161\u00ed teplotu gelace (55\u201365 \u00b0C oproti 65\u201375 \u00b0C u HEC) a odli\u0161n\u00e9 interakce s latexem, pigmentem a sol\u00ed \u2013 co\u017e v\u0161e ovliv\u0148uje jeho chov\u00e1n\u00ed v n\u00e1t\u011bru.<\/p>\n\n\n\n

Na adrese TENESSY Chemical<\/u><\/a>, oba polymery vyr\u00e1b\u00edme z vysoce kvalitn\u00edch bavln\u011bn\u00fdch linter\u016f na n\u011bmeck\u00e9m za\u0159\u00edzen\u00ed a m\u00e1me v\u00edce ne\u017e 10 000 z\u00e1kazn\u00edk\u016f ve v\u00edce ne\u017e 40 zem\u00edch. D\u00edky zku\u0161enostem s t\u011bmito dv\u011bma produkty m\u00e1me jedine\u010dn\u00fd nadhled: vid\u00edme, jak v\u00fdrobci barev a such\u00fdch sm\u011bs\u00ed pou\u017e\u00edvaj\u00ed tyto dv\u011b molekuly velmi odli\u0161n\u00fdm zp\u016fsobem, a tento pr\u016fvodce shrnuje na\u0161e poznatky o tom, v \u010dem m\u00e1 ka\u017ed\u00e1 z nich sv\u00e9 p\u0159ednosti. Najdete zde podrobnou srovn\u00e1vac\u00ed tabulku, logiku pou\u017eit\u00ed ka\u017ed\u00e9ho polymeru a praktick\u00e9 pokyny pro syst\u00e9my sm\u00ed\u0161en\u00e9ho pou\u017eit\u00ed, kde se HEC a HPMC vyskytuj\u00ed ve stejn\u00e9m slo\u017een\u00ed.<\/p>\n\n\n\n

HEC vs. HPMC: P\u0159\u00edm\u00e9 srovn\u00e1n\u00ed v oblasti n\u00e1t\u011brov\u00fdch hmot<\/strong><\/h2>\n\n\n\n
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<\/figcaption><\/figure>\n<\/figure>\n\n\n\n
Majetek<\/strong><\/strong><\/td>HEC<\/strong><\/strong><\/td>HPMC<\/strong><\/strong><\/td><\/tr>
Substituentn\u00ed skupiny<\/td>Hydroxyethyl (\u2013OCH\u2082CH\u2082OH)<\/td>Methoxy + hydroxypropyl <\/a>(\u2013OCH\u2083, \u2013OCH\u2082CH(OH)CH\u2083)<\/td><\/tr>
Iontov\u00fd charakter<\/td>Neiontov\u00e9<\/td>Neiontov\u00e9<\/td><\/tr>
Lokus zodpov\u011bdn\u00fd za zhu\u0161t\u011bn\u00ed<\/td>Pouze vodn\u00e1 f\u00e1ze<\/td>Vodn\u00ed f\u00e1ze + povrchov\u00e1 aktivita<\/td><\/tr>
citlivost na pH<\/td>\u017d\u00e1dn\u00e9<\/td>\u017d\u00e1dn\u00e9<\/td><\/tr>
Odolnost v\u016f\u010di soli<\/td>Vynikaj\u00edc\u00ed<\/td>Dobr\u00e9 (lep\u0161\u00ed ne\u017e v\u011bt\u0161ina zahu\u0161\u0165ovadel)<\/td><\/tr>
Teplota tepeln\u00e9 gelace<\/td>65\u201375 \u00b0C<\/td>55\u201365 \u00b0C<\/td><\/tr>
Stabilita viskozity v z\u00e1vislosti na teplot\u011b<\/td>Vysok\u00e1<\/td>St\u0159edn\u00ed (kles\u00e1 sm\u011brem k bodu gelace)<\/td><\/tr>
\u00da\u010dinnost zahu\u0161\u0165ov\u00e1n\u00ed (KU na kg)<\/td>Vysok\u00e1<\/td>St\u0159edn\u00ed a\u017e vysok\u00e1<\/td><\/tr>
Sn\u00ed\u017een\u00ed viskozity p\u0159i smyku (pseudoplasticita)<\/td>Siln\u00fd<\/td>M\u00edrn\u00e1<\/td><\/tr>
Odolnost proti pr\u016fv\u011bsu p\u0159i stejn\u00e9 viskozit\u011b<\/td>Vynikaj\u00edc\u00ed<\/td>Dobr\u00fd<\/td><\/tr>
Vyrovn\u00e1v\u00e1n\u00ed<\/td>Uspokojiv\u00e9 (zlep\u0161uje se p\u0159i pou\u017eit\u00ed dopl\u0148kov\u00e9ho zahu\u0161\u0165ovadla)<\/td>M\u00edrn\u00e1<\/td><\/tr>
Vod\u011bodolnost such\u00e9ho filmu<\/td>Dobr\u00e9 (neiontov\u00e9, n\u00edzk\u00e9 d\u00e1vkov\u00e1n\u00ed)<\/td>St\u0159edn\u00ed (povrchov\u011b aktivn\u00ed, vy\u0161\u0161\u00ed d\u00e1vka)<\/td><\/tr>
Odolnost lakov\u00e9ho filmu proti mokr\u00e9mu drhnut\u00ed<\/td>Dobr\u00e9 p\u0159i \u22640,451 TP3T<\/td>Sn\u00ed\u017eeno p\u0159i ekvivalentn\u00ed d\u00e1vce<\/td><\/tr>
Kompatibilita s latexov\u00fdmi pojivy<\/td>Vynikaj\u00edc\u00ed<\/td>Dobr\u00e9 (sledujte interakce s povrchov\u011b aktivn\u00edmi l\u00e1tkami)<\/td><\/tr>
Kompatibilita s cementem\/s\u00e1drovcem<\/td>M\u00edrn\u00e1<\/td>Vynikaj\u00edc\u00ed (standard pro such\u00e9 sm\u011bsi)<\/td><\/tr>
Zadr\u017eov\u00e1n\u00ed vody v cementov\u00fdch syst\u00e9mech<\/td>N\u00edzk\u00e1<\/td>Vynikaj\u00edc\u00ed (hlavn\u00ed funkce)<\/td><\/tr>
Tvorba filmu \/ pojivo<\/td>Slab\u00e9<\/td>Dod\u00e1v\u00e1 textu charakter podobn\u00fd se\u0161itu<\/td><\/tr>
Chov\u00e1n\u00ed rozpustnosti<\/td>Pouze studen\u00e1 voda<\/td>Studen\u00e1 voda; hork\u00e1 voda zp\u016fsobuje rozptyl<\/td><\/tr>
Hlavn\u00ed pou\u017eit\u00ed<\/td>Latexov\u00e9 barvy, textilie, ropn\u00e1 pole<\/td>Such\u00e9 stavebn\u00ed sm\u011bsi, s\u00e1dra, n\u011bkter\u00e9 barvy<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Tabulka mluv\u00ed sama za sebe:Hydroxyethylcelul\u00f3za (HEC) <\/u><\/a> je ur\u010den pro barvy, HPMC pro maltu. Zvl\u00e1\u0161tn\u00ed pozornost si v\u0161ak zaslou\u017e\u00ed t\u0159i \u0159\u00e1dky, proto\u017ee vysv\u011btluj\u00ed v\u011bt\u0161inu rozhodnut\u00ed ohledn\u011b slo\u017een\u00ed.<\/p>\n\n\n\n

1. \u00da\u010dinnost zahu\u0161\u0165ov\u00e1n\u00ed a k\u0159ivka viskozity<\/strong><\/h3>\n\n\n\n

P\u0159i stejn\u00e9 molekulov\u00e9 hmotnosti je HEC ve vod\u011b \u00fa\u010dinn\u011bj\u0161\u00edm zahu\u0161\u0165ovadlem ne\u017e HPMC, proto\u017ee jeho v\u011bt\u0161\u00ed, pln\u011b hydrofiln\u00ed hydroxyethylov\u00fd postrann\u00ed \u0159et\u011bzec zab\u00edr\u00e1 v\u011bt\u0161\u00ed hydrodynamick\u00fd objem a vytv\u00e1\u0159\u00ed siln\u011bj\u0161\u00ed propleten\u00ed. V n\u00e1t\u011brov\u00e9 hmot\u011b to v praxi znamen\u00e1, \u017ee HEC dosahuje dan\u00e9 c\u00edlov\u00e9 hodnoty Stormerova \u010d\u00edsla (KU) p\u0159i ni\u017e\u0161\u00edm such\u00e9m d\u00e1vkov\u00e1n\u00ed ne\u017e HPMC. Je\u0161t\u011b d\u016fle\u017eit\u011bj\u0161\u00ed je, \u017ee HEC \u00fa\u010dinn\u011bji vytv\u00e1\u0159\u00ed strukturu odolnou v\u016f\u010di n\u00edzk\u00e9mu st\u0159ihu \u2013 mez kluzu a klidovou viskozitu \u2013, co\u017e se p\u0159\u00edmo prom\u00edt\u00e1 do odolnosti proti st\u00e9k\u00e1n\u00ed a zabr\u00e1n\u011bn\u00ed usazov\u00e1n\u00ed pigmentu.<\/p>\n\n\n\n

2. Hydrofobita: Skryt\u00fd rozd\u00edl<\/strong><\/h3>\n\n\n\n

HPMC<\/u><\/a>\u00a0obsahuje methoxyskupiny, kter\u00e9 jsou hydrofobn\u00ed. Ve vod\u011b tyto skupiny vyvol\u00e1vaj\u00ed m\u00edrnou povrchovou aktivitu: roztoky HPMC sni\u017euj\u00ed povrchov\u00e9 nap\u011bt\u00ed, stabilizuj\u00ed vzduchov\u00e9 bubliny a interaguj\u00ed s micelami povrchov\u011b aktivn\u00edch l\u00e1tek a latexov\u00fdmi \u010d\u00e1sticemi. V cementov\u00e9 malt\u011b je to v\u00fdhoda (lep\u0161\u00ed maz\u00e1n\u00ed, regulace vn\u00e1\u0161en\u00ed vzduchu). V latexov\u00e9 barv\u011b to v\u0161ak p\u0159edstavuje probl\u00e9m: HPMC m\u016f\u017ee destabilizovat latexovou disperzi, podporovat tvorbu p\u011bny, kterou je obt\u00ed\u017en\u00e9 potla\u010dit, a zanech\u00e1vat film m\u00edrn\u011b citliv\u00fd na vodu. HEC neobsahuje \u017e\u00e1dn\u00e9 hydrofobn\u00ed skupiny, a proto nikdy nenaru\u0161uje latex.<\/p>\n\n\n\n

3. Citlivost such\u00e9ho filmu na vodu<\/strong><\/h3>\n\n\n\n

Zahu\u0161\u0165ovadlo s vysok\u00fdm obsahem vodn\u00e9 f\u00e1ze zanech\u00e1v\u00e1 ve vyschl\u00e9m filmu ur\u010dit\u00e9 mno\u017estv\u00ed ve vod\u011b rozpustn\u00e9ho polymeru. Ot\u00e1zkou je, jak velkou citlivost to zp\u016fsobuje. HEC v typick\u00e9m d\u00e1vkov\u00e1n\u00ed pro barvy (0,25\u20130,45%) vytv\u00e1\u0159\u00ed film s dobrou odolnost\u00ed proti vod\u011b a barvy spl\u0148uj\u00ed 300\u2013500+ cykl\u016f mokr\u00e9ho drhnut\u00ed podle normy ASTM D2486. HPMC p\u0159i stejn\u00e9m d\u00e1vkov\u00e1n\u00ed m\u00e1 tendenci film v\u00edce zm\u011bk\u010dovat, proto\u017ee povrchov\u011b aktivn\u00ed methoxyskupiny lok\u00e1ln\u011b zpomaluj\u00ed koalescenci latexu. To je nej\u010dast\u011bj\u0161\u00ed d\u016fvod, pro\u010d formul\u00e1tor, kter\u00fd p\u0159ejde z HEC na HPMC, zaznamen\u00e1 pokles odolnosti proti drhnut\u00ed. Opa\u010dn\u00fd postup \u2013 p\u0159echod u malty z HPMC na HEC \u2013 selh\u00e1v\u00e1 z opa\u010dn\u00e9ho d\u016fvodu: HEC nedok\u00e1\u017ee zajistit zadr\u017eov\u00e1n\u00ed vody, kter\u00e9 je nezbytn\u00e9 pro hydrataci cementu.<\/p>\n\n\n\n

Kdy zvolit HEC: Latexov\u00e9 barvy a n\u00e1t\u011brov\u00e9 hmoty<\/strong><\/h2>\n\n\n\n

HEC<\/u><\/a> je standardn\u00ed zahu\u0161\u0165ovadlo pro barvy na vodn\u00ed b\u00e1zi, konkr\u00e9tn\u011b pro:<\/p>\n\n\n\n