{"id":12979,"date":"2025-09-09T02:14:13","date_gmt":"2025-09-09T02:14:13","guid":{"rendered":"https:\/\/tenessy.com\/?p=12979"},"modified":"2025-09-09T06:50:52","modified_gmt":"2025-09-09T06:50:52","slug":"analysis-of-the-application-of-cellulose-ether-in-gypsum-plaster-mortar","status":"publish","type":"post","link":"https:\/\/tenessy.com\/fi\/analyysi-selluloosaeetterin-kaytosta-kipsilaastissa\/","title":{"rendered":"Analyysi selluloosaeetterin k\u00e4yt\u00f6st\u00e4 kipsilaastissa ja kipsilaastissa k\u00e4ytett\u00e4v\u00e4n laastin k\u00e4yt\u00f6st\u00e4"},"content":{"rendered":"
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Vaikka selluloosa eetteri<\/a> lis\u00e4t\u00e4\u00e4n vain 0,1%-0,5% (koko kuiva-aineesta). kipsilaasti<\/a> se on keskeinen funktionaalinen lis\u00e4aine, joka m\u00e4\u00e4ritt\u00e4\u00e4 laastin \"ty\u00f6stett\u00e4vyyden\" ja \"suorituskyvyn\". Sen keskeinen teht\u00e4v\u00e4 voidaan n\u00e4hd\u00e4 kolmessa ulottuvuudessa: vedenpid\u00e4tyskyky, ty\u00f6stett\u00e4vyys ja halkeilun kest\u00e4vyys. Erityinen sovelluslogiikka on seuraava<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1. Ydinteht\u00e4v\u00e4: Kipsilaastin \"suorituskyvyn kipupisteisiin\" puuttuminen.<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Kipsilaastin (rakennuskipsi) perusmateriaalilla on luonnostaan nopean kovettumisen ja huonon vedenpid\u00e4tyskyvyn ominaisuudet. Ilman selluloosaeetterin lis\u00e4yst\u00e4 laasti on altis nopealle vesih\u00e4vi\u00f6lle rakentamisen aikana, mik\u00e4 johtaa ongelmiin, kuten \"kovettuu liian nopeasti ja vaikeuttaa tasaista levitt\u00e4mist\u00e4\" ja \"huono tartunta pohjakerrokseen, mik\u00e4 johtaa onttoutumiseen ja hajoamiseen\". Selluloosaeetteri puuttuu molekyylirakenteensa ansiosta juuri n\u00e4ihin puutteisiin:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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2. Vahva vedenpid\u00e4tys: Pident\u00e4\u00e4 ty\u00f6aikaa ja varmistaa hydrataatioreaktion<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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3. Parempi ty\u00f6stett\u00e4vyys: Helpottaa laastin levitt\u00e4mist\u00e4 ja est\u00e4\u00e4 notkistumisen.<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Selluloosaeetterin molekyyliketjun hydroksyyliryhm\u00e4t muodostavat vetysidoksia vesimolekyylien kanssa, jolloin kosteus poistuu laastista. \"Lukitsee\" kosteuden ja hidastaa sen tunkeutumista alustaan (kuten betoni- ja tiiliseiniin).<\/p>

K\u00e4yt\u00e4nn\u00f6n arvo: Tavallisen kipsilaastin avoin aika rakentamisen aikana on vain noin 30 minuuttia. Selluloosan lis\u00e4\u00e4minen<\/a> Eetteri voi pident\u00e4\u00e4 t\u00e4t\u00e4 aikaa 60-90 minuuttiin, mik\u00e4 t\u00e4ytt\u00e4\u00e4 \"sekoittamisen, kuljetuksen ja levitt\u00e4misen\" aikavaatimukset, kun kyseess\u00e4 on suurten alueiden rappaus. Lis\u00e4ksi riitt\u00e4v\u00e4 kosteus mahdollistaa kipsin t\u00e4ydellisen hydratoitumisen (muodostaen dihydraattikipsin), jolloin estet\u00e4\u00e4n riitt\u00e4m\u00e4t\u00f6n hydratoituminen, joka voi johtaa riitt\u00e4m\u00e4tt\u00f6m\u00e4\u00e4n laastin lujuuteen ja pinnan hiomiseen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Selluloosaeetteri lis\u00e4\u00e4 laastin viskositeettia ja saantoarvoa ja antaa sille erinomaisen ty\u00f6stett\u00e4vyyden ja tiksotropian.<\/p>

Levityksen aikana laasti tarttuu helposti lastaan ja irtoaa v\u00e4hemm\u00e4n todenn\u00e4k\u00f6isesti. Levitys aiheuttaa minimaalisen vastuksen, mik\u00e4 v\u00e4hent\u00e4\u00e4 ty\u00f6ntekij\u00e4n ty\u00f6panosta.<\/p>

Pystysuorassa levityksess\u00e4 (kuten sein\u00e4rappauksessa) laasti ei liukua tai notkahda oman painonsa alla, jolloin rappauslaastin paksuus pysyy tasaisena (sopii erityisesti 20-30 mm:n paksuisille kerroksille), mik\u00e4 v\u00e4hent\u00e4\u00e4 my\u00f6hempi\u00e4 tasoitust\u00f6it\u00e4.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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4. Parannettu halkeamankest\u00e4vyys: V\u00e4hent\u00e4\u00e4 kuivumiskutistumishalkeamia.<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Kipsilaastin tilavuus pienenee veden haihtumisen vuoksi kovettumisen aikana, jolloin se on altis pienille halkeamille. Selluloosaeetterit lievent\u00e4v\u00e4t t\u00e4t\u00e4 ongelmaa kahdella tavalla:<\/p>

Toisaalta, niiden vett\u00e4 pid\u00e4tt\u00e4v\u00e4 vaikutus antaa laastin kosteuden haihtua hitaasti.<\/a>est\u00e4\u00e4 nopean vesih\u00e4vi\u00f6n aiheuttaman ep\u00e4tasaisen kutistumisen.<\/p>

Toisaalta selluloosaeetterien molekyyliketjut muodostavat laastin sis\u00e4lle \"joustavan verkon\", joka jakaa kutistumisj\u00e4nnityksen ja v\u00e4hent\u00e4\u00e4 halkeilun todenn\u00e4k\u00f6isyytt\u00e4. Ne soveltuvat erityisen hyvin rappaukseen kuivissa tiloissa tai pitkien j\u00e4nnev\u00e4lien seiniss\u00e4.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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II. Sovelluksen p\u00e4\u00e4kohdat: Lis\u00e4ysm\u00e4\u00e4r\u00e4n ja -tyypin valinta<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Selluloosaeetterien tehokkuus edellytt\u00e4\u00e4 \"tarkkaa valintaa ja asianmukaista lis\u00e4\u00e4mist\u00e4\". Sokeat s\u00e4\u00e4d\u00f6t voivat helposti johtaa suorituskyvyn poikkeamiin.<\/p>

Tyypin valinta: Hydroksipropyylimetyyliselluloosa (HPMC)<\/a> on suositeltavaa.<\/p>

HPMC on yleisimmin k\u00e4ytetty selluloosaeetteri kipsilaasteissa, koska siin\u00e4 yhdistyv\u00e4t seuraavat seikat korkea vedenpid\u00e4tyskyky<\/a> jolla on kohtalaiset sakeuttamisominaisuudet. Se on my\u00f6s hyvin yhteensopiva kipsin kanssa eik\u00e4 vaikuta kipsin kovettumis- ja kovettumisnopeuteen (jotkin muut selluloosaeetterityypit voivat hidastaa kovettumista).<\/p>

Ohjeet: (alhainen viskositeetti johtaa riitt\u00e4m\u00e4tt\u00f6m\u00e4\u00e4n vedenpid\u00e4tyskykyyn, kun taas korkea viskositeetti voi johtaa liian paksuun laastiin ja huonoon pintak\u00e4sittelyyn).<\/p>

Lis\u00e4annostus: 0,15%-0,3% on optimaalinen alue.<\/p>

V\u00e4hint\u00e4\u00e4n: Alle 0,15% johtaa riitt\u00e4m\u00e4tt\u00f6m\u00e4\u00e4n vedenpid\u00e4tyskykyyn, onttoutumiseen ja laastin heikkoon lujuuteen.<\/p>

Enimmill\u00e4\u00e4n: Yli 0,3% johtaa liian paksuun laastiin, joka aiheuttaa helposti kuplia sekoituksen aikana. N\u00e4m\u00e4 kuplat puhkeavat ja muodostavat pieni\u00e4 huokosia kovettumisen j\u00e4lkeen, mik\u00e4 vaikuttaa pinnan tasaisuuteen ja lujuuteen. Liian suuri m\u00e4\u00e4r\u00e4 selluloosaetteri\u00e4 voi my\u00f6s aiheuttaa sen, ett\u00e4 laasti n\u00e4ytt\u00e4\u00e4 jauhemaiselta kuivumisen j\u00e4lkeen.<\/p>

Erityistilanteita varten teht\u00e4v\u00e4t mukautukset: Jos pohjakerros on eritt\u00e4in imukykyinen (kuten huokoiset tiilisein\u00e4t), annostusta voidaan nostaa 0,3%-0,4%:iin vedenpid\u00e4tyskyvyn parantamiseksi. Ohutrappauksessa (\u226410 mm) annostusta voidaan pienent\u00e4\u00e4 0,15%-0,2%:iin, jotta estet\u00e4\u00e4n laastin liiallinen paksuuntuminen, joka vaikuttaa tasaisuuteen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u2162.Gypsum-Based Mortar Raw Material Formula Table (Kipsipohjaisen laastin raaka-ainetaulukko)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Raaka-aineen nimi<\/p><\/td>

Toiminto<\/p><\/td>

Viiteannosalue (kg)<\/p><\/td>

Huomautukset<\/p><\/td><\/tr>

Rakentaminen Kipsijauhe<\/p><\/td>

Sementtipitoinen materiaali<\/p><\/td>

1000<\/p><\/td>

Ydinraaka-aine. Sen laatu (esim. taivutuslujuus \u2265 2,5 MPa), kovettumisaika (alkukovettuminen \u2265 60 min) ja kahden tunnin taivutus- ja puristuslujuus on vahvistettava.<\/p><\/td><\/tr>

Korkealaatuinen jokihiekka<\/p><\/td>

Aggregaatti<\/p><\/td>

1200 – 1500<\/p><\/td>

Suositellaan, ett\u00e4 sen partikkelikoko on 0,1-0,6 mm ja mutapitoisuus < 1%. Hiekan ja kipsin suhde m\u00e4\u00e4ritt\u00e4\u00e4 laastin lujuuden ja ty\u00f6stett\u00e4vyyden.<\/p><\/td><\/tr>

Hydroksipropyylimetyyliselluloosa (HPMC)<\/p><\/td>

Veden pid\u00e4tt\u00e4minen, sakeuttaminen<\/p><\/td>

2.0 – 3.5<\/p><\/td>

T\u00e4rkein lis\u00e4aine. Yleinen viskositeetti: 40000-60000 mPa\u30fbs. Varmistaa, ett\u00e4 laasti ei menet\u00e4 vett\u00e4 liian nopeasti, ja antaa hyv\u00e4n ty\u00f6stett\u00e4vyyden.<\/p><\/td><\/tr>

Hidastin<\/p><\/td>

Asetusajan s\u00e4\u00e4t\u00e4minen<\/p><\/td>

1.0 – 3.0<\/p><\/td>

Yleisesti k\u00e4ytet\u00e4\u00e4n proteiinipohjaisia tai sitruunahappopohjaisia hidastimia. Se on s\u00e4\u00e4dett\u00e4v\u00e4 tarkasti kipsirouheen alkutartunta-ajan ja ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tilan mukaan.<\/p><\/td><\/tr>

Redispergoituva polymeerijauhe<\/p><\/td>

Liimauslujuuden ja koheesion parantaminen<\/p><\/td>

4.0 – 8.0<\/p><\/td>

Se parantaa sitkeytt\u00e4, v\u00e4hent\u00e4\u00e4 onteloitumista ja halkeilua sek\u00e4 parantaa pudonneen laastin uudelleenk\u00e4ytett\u00e4vyytt\u00e4. Annostus s\u00e4\u00e4det\u00e4\u00e4n kustannusten ja vaatimusten mukaan.<\/p><\/td><\/tr>

T\u00e4rkkelys Eetteri<\/p><\/td>

Anti-Sagging, Paksuuntuminen<\/p><\/td>

0.3 – 0.8<\/p><\/td>

K\u00e4ytet\u00e4\u00e4n p\u00e4\u00e4asiassa mekaanisissa ruiskutusvalmisteissa est\u00e4m\u00e4\u00e4n laastin irtoamista sein\u00e4st\u00e4 ja parantamaan k\u00e4den tuntumaa.<\/p><\/td><\/tr>

Ilmastointikoulutusaine<\/p><\/td>

Mikrokuplien esittely<\/p><\/td>

0.1 – 0.5<\/p><\/td>

Hyvin pienen\u00e4 m\u00e4\u00e4r\u00e4n\u00e4 lis\u00e4ttyn\u00e4 se parantaa rakenteen tasaisuutta ja v\u00e4hent\u00e4\u00e4 tiheytt\u00e4, mutta se v\u00e4hent\u00e4\u00e4 lujuutta, joten sit\u00e4 on k\u00e4ytett\u00e4v\u00e4 varoen.<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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IV. Huomautuksia:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Synergia muiden lis\u00e4aineiden kanssa<\/p>

Kipsilaasteissa k\u00e4ytet\u00e4\u00e4n usein hidasteita (kuten natriumsitraattia) ja vedenpid\u00e4ttimi\u00e4 (kuten t\u00e4rkkelysett\u00e4). Huomioi selluloosaeetterin yhteensopivuus n\u00e4iden aineiden kanssa:<\/p>

V\u00e4lt\u00e4 liiallista sekoittamista vahvoilla hidastimilla, sill\u00e4 t\u00e4m\u00e4 voi johtaa laastin kovettumisen pitkittymiseen (yli 12 tuntia), mik\u00e4 vaikuttaa rakennusaikatauluun.<\/p>

Jos t\u00e4rkkelysett\u00e4 lis\u00e4t\u00e4\u00e4n (vedenpid\u00e4tyksen vuoksi), selluloosaeetterin annostusta on pienennett\u00e4v\u00e4 sopivasti (esim. 0,2%:st\u00e4 0,15%:hen), jotta estet\u00e4\u00e4n liiallinen vedenpid\u00e4tys, joka voi johtaa hitaaseen kuivumiseen ja homeen muodostumiseen laastissa.<\/p>

Sekoitus- ja varastointivaatimukset<\/p>

Sekoituksen aikana selluloosaeetteri on sekoitettava huolellisesti kuivaan kiviainekseen (kuten kvartsihiekkaan) ennen veden lis\u00e4\u00e4mist\u00e4. N\u00e4in estet\u00e4\u00e4n selluloosaeetterin joutuminen suoraan kosketuksiin veden kanssa, kokkareiden muodostuminen ja dispergoitumiseen vaikuttaminen.<\/p>

Varastoinnin aikana selluloosaeetteri imee helposti kosteutta ja paakkuuntuu. Se on s\u00e4ilytett\u00e4v\u00e4 suljetussa, kuivassa ymp\u00e4rist\u00f6ss\u00e4. Mahdolliset kokkareet on murskattava ja seulottava ennen k\u00e4ytt\u00f6\u00e4. Muuten selluloosaeetterin pitoisuus laastissa voi olla liian suuri, jolloin syntyy liian tiheit\u00e4 alueita ja riitt\u00e4m\u00e4t\u00f6n vedenpid\u00e4tys.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Vaikka selluloosaeetteri\u00e4 lis\u00e4t\u00e4\u00e4n vain 0,1%-0,5% (kokonaiskuiva-aineesta) kipsilaastin koostumukseen, se on keskeinen toiminnallinen lis\u00e4aine, joka m\u00e4\u00e4ritt\u00e4\u00e4 laastin \"ty\u00f6stett\u00e4vyyden\" ja \"suorituskyvyn\". Sen keskeinen rooli voidaan n\u00e4hd\u00e4 kolmessa ulottuvuudessa: vedenpid\u00e4tyskyky, ty\u00f6stett\u00e4vyys ja halkeilun kest\u00e4vyys. Erityinen sovelluslogiikka on seuraava 1. [...]<\/p>","protected":false},"author":1,"featured_media":11499,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[34],"tags":[],"class_list":["post-12979","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-news"],"yoast_head":"\nAnalysis of the Application of Cellulose Ether in Gypsum Plaster Mortar - HPMC|HEMC|HEC|RDP Manufacturer-TENESSY<\/title>\n<meta name=\"description\" content=\"Learn more about the formulation and application of HPMC in gypsum plaster mortar systems\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tenessy.com\/fi\/analyysi-selluloosaeetterin-kaytosta-kipsilaastissa\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Analysis of the Application of Cellulose Ether in Gypsum Plaster Mortar - 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