Focus on Cellulose ethers

Additives inoshandiswa mukuputira

I. Muchidimbu
Seimwe yezvinhu zvakasvibirira zvejasi, huwandu hwekuwedzera hunowanzo hudiki kwazvo (kazhinji hunenge 1% yehuwandu hwekuumbwa), asi mhedzisiro yacho yakakura. Kuwedzerwa kwayo hakugone chete kudzivirira kukanganisa kwakawanda kwekupfeka uye kukanganisa kwemafirimu, asi zvakare kuita kuti kugadzira uye kuvaka maitiro eiyo coating kuve nyore kudzora, uye kuwedzera kwezvimwe zvinowedzera zvinogona kupa kuvharisa nemamwe mabasa akakosha. Nokudaro, zvinowedzera chikamu chinokosha chekuputira.

2. Kurongwa kwezvinowedzera
Zvinowanzo shandiswa zvekuwedzera zvekupfeka zvinosanganisira organic anti-settling agents, thickeners, leveling agents, furo control agents, adhesion promotions, wetting and dispersing agents, etc.

3. Kuita uye kushandiswa kwezvinowedzera

(1) Organic anti-settling agent
Zvizhinji zvezvigadzirwa izvi zvakabva pa polyolefins, yakaparadzirwa mune imwe solvent, dzimwe nguva inogadziridzwa nekasitori yemafuta anobva. Izvi zvinowedzera zvinouya mumhando nhatu: mvura, paste, uye hupfu.

1. Rheological properties:
Iyo huru rheological basa reiyo organic anti-settling agents ndeye kudzora kumiswa kwe pigments - ndiko kuti, kudzivirira kugadzika kwakaoma kana kudzivirira kugadzika zvachose, inova yavo yakajairika application. Asi mukuita, zvinokonzeresa kuwedzera kwe viscosity uyezve imwe dhigirii yekuramba sag, kunyanya mumaindasitiri ekupfeka. Organic anti-settling agents inonyungudika nekuda kwekukwira kwekushisa, nekudaro vachirasikirwa nekuita kwavo, asi rheology yavo inopora sezvo system inotonhora.

2. Kushandiswa kwe organic anti-settling agent:
Kuti uite kuti anti-settleling agent ishande zvinobudirira mukuputira, inofanira kuparadzirwa zvakanaka uye kushandiswa. Matanho chaiwo ndeaya anotevera:
(1) Kunyorova (poda yakaoma chete). Iyo yakaoma poda organic anti-sedimentation agent ndeye aggregate, kuitira kuti iparadzanise zvimedu kubva kune imwe neimwe, inofanirwa kunyoroveswa ne solvent uye (kana) resin. Zvinowanzokwana kuti uwedzere kune slurry yekukuya nekushungurudzika kwepakati.
(2) Deagglomeration (chete yehupfu yakaoma). Iyo yekuunganidza simba re organic anti-sedimentation agents haina kusimba zvakanyanya, uye nyore kusanganisa kusanganisa kunokwana muzviitiko zvakawanda.
(3) Kupararira, kupisa, nguva yekupararira (marudzi ose). Yese organic anti-sedimentation agents ane hushoma activation tembiricha, uye kana ikasasvikwa, kunyangwe yakakura sei simba rekuparadzira, hapazove nekuita rheological. The activation tembiricha inobva pane solvent inoshandiswa. Kana tembiricha shoma yadarika, kushushikana kwakaiswa kunomutsa iyo organic anti-sedimentation agent uye inopa kutamba kwakazara kuita kwayo.

(2) Mukobvu
Kune marudzi akasiyana-siyana emakobvu anoshandiswa mu solvent-based and water-based paints. Mhando dzakajairika dzemakobvu anoshandiswa mukunamira mumvura ndeaya: cellulose ethers, polyacrylates, associative thickeners uye inorganic thickeners.
1. Inonyanya kushandiswa cellulose ether thickener ndiyo hydroxyethyl cellulose (HEC). Zvichienderana ne-viscosity, pane zvakasiyana-siyana. HEC ivhu rinonyungudika nemvura, iyo isiri-ionic thickener. Iyo ine yakanaka thickening mhedzisiro, yakanaka kudzivirira mvura uye alkali kuramba, asi zvayakaipira ndezvekuti zviri nyore kumera mold, kuora, uye ine hurombo hwekuyera pfuma.
2. Iyo polyacrylate thickener is acrylate copolymer emulsion ine yakakwira carboxyl content, uye chikuru chayo ndechekuramba kwayo kwakanaka kuvhomora mold. Kana pH iri 8-10, rudzi urwu rwehupfu hunozvimba uye hunowedzera viscosity yechikamu chemvura; asi kana pH yakakura kudarika gumi, inonyungudika mumvura uye inorasikirwa nekuita kwayo. Naizvozvo, kune kunzwisiswa kukuru kune pH. Parizvino, ammonia mvura ndiyo inonyanya kushandiswa pH inogadzirisa ye latex pendi muChina. Naizvozvo, kana rudzi urwu rwekukora ruchishandiswa, kukosha kwepH kunoderera nekupisa kwemvura yeammonia, uye kukora kwayo kunodererawo.
3. Associative thickeners ane nzira dzakasiyana dzekukora kubva kune mamwe marudzi ehupfu. Mazhinji makobvu anounza viscosity kuburikidza ne hydration uye kuumbwa kweiyo isina kusimba gel chimiro muhurongwa. Nekudaro, associative thickeners, sema surfactants, ane ese ari maviri hydrophilic zvikamu uye nemuromo-ane hushamwari yero yekuchenesa mafuta zvikamu mumorekuru. Iyo hydrophilic zvikamu zvinogona kuve hydrated uye kuzvimba kuti iwedzere chikamu chemvura. Iwo lipophilic ekupedzisira mapoka anogona kusanganiswa ne emulsion particles uye pigment particles. batanidza kugadzira network network.
4. Iyo inorganic thickener inomiririrwa ne bentonite. Kazhinji mvura-based bentonite inoputika kana inotora mvura, uye vhoriyamu mushure mekutora mvura yakawanda kakawanda. Iyo haingoite seyakakora chete, asi zvakare inodzivirira kunyura, kudonha, uye kuyerera ruvara. Iko kukora kwayo kuri nani pane iyo alkali-swellable acrylic uye polyurethane thickeners muhuwandu hwakafanana. Pamusoro pezvo, ine zvakare yakafaranuka yepH kuchinjika, yakanaka chando-thaw kugadzikana uye biological kugadzikana. Nemhaka yokuti haina mvura-inonyunguduka surfactants, zvimedu zvakanaka mufirimu yakaoma zvinogona kudzivirira kufamba kwemvura uye kupararira, uye inogona kuwedzera kudzivirira kwemvura kwefirimu yekuputira.

(3) mumiririri wekuenzanisa

Kune matatu makuru emhando dzeaya ekuyeresa anowanzoshandiswa:
1. Modified polysiloxane mhando leveling agent
Rudzi urwu rwemumiriri wekuenzanisa runogona kudzikisa zvakanyanya kusimba kwepamusoro kwejasi, kuvandudza kunyorova kwejasi kune substrate, uye kudzivirira shrinkage; inogona kuderedza kukanganiswa kwepamusoro-soro pamusoro peiyo firimu yakanyorova nekuda kwekunyungudika kwekunyungudika, kunatsiridza kuyerera kwepasi, uye kuita Iyo pendi inokurumidza kuenzaniswa; rudzi urwu rwemugadziri wekuenzanisa anogonawo kugadzira firimu rakanyanya kutetepa uye rakatsetseka pamusoro peiyo firimu rekuvhara, nekudaro ichivandudza kutsvedzereka uye kupenya kweiyo bhaisikopo repamusoro.
2. Yakareba-cheni resin mhando yekuenzanisa mumiririri ane mashoma kuenderana
Zvakadai se acrylate homopolymer kana copolymer, iyo inogona kuderedza kushushikana kwepamusoro kwejasi uye substrate kune imwe nhanho yekuvandudza kunyorova uye kudzivirira shrinkage; uye inogona kuumba imwechete molecular level pamusoro peiyo firimu yekuputira kuti iwedzere kushushikana kwepamusoro kwejasi Homogenize, kunatsiridza kuyerera kwepasi, inhibit solvent volatilization kumhanya, kubvisa kuremara kwakadai seorenji peel uye brashi mamaki, uye kuita kuti firimu rekuputira rive rakatsetseka uye kunyange.
3. Leveling agent ine high boiling point solvent sechinhu chikuru
Iyi mhando yeajenti yekuyera inogona kugadzirisa kuvhurika kweyekunyungudika, kuitira kuti firimu rekuputira rive rakanyanya kuenzana volatilization rate uye solvency panguva yekuomeswa, uye inodzivirira kuyerera kweiyo firimu rekuvhara kubva pakudziviswa nekunyungudika kwekunyungudika nekukurumidza uye iyo viscosity yakanyanya kuwanda, zvichikonzera kusaenzana kwakashata, uye inogona kudzivirira shrinkage inokonzerwa nekusagadzikana kunyungudika kwezvinhu zvepasi uye kunaya kwemvura kunokonzerwa nekunyungudika kwekunyungudika nekukurumidza.

(4) Foam control agent
Foam control agents anonziwo antifoaming agents kana defoaming agents. Anti-foaming agents anodzivirira kana kunonotsa kuumbwa kwefuro: Anti-foaming agents ma surfactants anoputika mabubble anenge aita. Musiyano uripo pakati pezviviri ungori dzidziso kune imwe nhanho, yakabudirira defoamer inogona zvakare kudzivirira kuumbwa kwefuro senge antifoam agent. Kazhinji kutaura, antifoaming agent inoumbwa nezvikamu zvitatu zvakakosha: mubatanidzwa unoshanda (kureva, mumiriri anoshanda); diffusing agent (inowanikwa kana kwete); mutakuri.

(5) Kunyorova nekuparadzira zvinhu
Kunyorova uye kuparadzira vamiririri vanogona kunge vaine mabasa akasiyana-siyana, asi mabasa maviri makuru ndeekuderedza nguva uye/kana simba rinodiwa kupedzisa kupararira uku uchidzikamisa kupararira kwe pigment. Wetting agents uye dispersants zvinowanzogoverwa kuva zvinotevera

Zvikamu zvishanu:
1. Anionic wetting agent
2. Cationic wetting agent
3. Electroneutral, amphoteric wetting agent
4. Bifunctional, isiri-electricic neutral wetting agent
5. Non-ionic wetting agent

Mhando ina dzekutanga dzekunyorovesa vamiririri uye vanoparadzira vanogona kuita basa rekunyorova uye kubatsira pigment kupararira nekuti yavo hydrophilic migumo ine kugona kuumba emuviri uye kemikari zvisungo neiyo pigment pamusoro, mipendero, makona, nezvimwewo, uye kufamba vakananga kuOriental the pigment pamusoro, kazhinji kuguma kwehydrophobic. Nonionic wetting uye dispersing agents anewo hydrophilic end groups, asi haakwanise kuumba zvisungo zvemuviri nemakemikari ane pigment surface, asi anogona kusanganisa nemvura inoshambadza pamusoro pepigment particles. Iyi mvura inosunga kune pigment particle surface haina kugadzikana uye inotungamira kune isiri-ionic kunyura uye desorption. Iyo desorbed surfactant mune ino resin system ndeyemahara uye inokonzeresa mhedzisiro senge kusamira zvakanaka kwemvura.

Iyo yekunyorovesa agent uye dispersant inofanirwa kuwedzerwa panguva yekuparadzira pigment process, kuitira kuti ive nechokwadi chekuti zvimwe zvinhu zvinoshanda zviri pamusoro zvinogona kunge zviri padhuze neiyo pigment kutamba basa ravo isati yasvika pamusoro peiyo pigment particle.

Four. Summary

Coating igadziriro yakaoma. Sechikamu chegadziriro, zvinowedzerwa zvinowedzerwa muchidimbu, asi vanoita basa rinokosha mukuita kwayo. Nokudaro, paunenge uchigadzira-solvent-based coatings, izvo zvinowedzera kushandisa uye chiyero chavo chinofanira kusarudzwa kuburikidza nenhamba yakawanda yekuongorora kwakadzokororwa.


Nguva yekutumira: Jan-30-2023
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