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ANH HimNG CUA PHU GIA NANG SILICA Si02 DEN MOT SO TINH CHAT CUA SON VO CO CHjU NHIET
EFFECTS OF NANO SILICA ADDITION ON SOME PROPERTIES OF HEAT RESISTANT INORGANIC PAINT
Den Tda soan 08-06- 2014
Duang Manh Tien', Hoang Anh T u a n \ Dang HSu T u a n \ La The Vinh' 'Wen Hda hgc Cdng nghiep Viet Nam
^Vidn Ky thudt Hda hgc, Trudng Dai hgc Bach khoa Ha Ndi
ABSTRACT
The product of heat resistant inorganic paint based on alumino-phosphate polymer have been studied and produced by scientists of Hanoi University of Science and Technology. This paper shows the effects of nano silica addition on some properties of heat resistant inorganic paints. To improve some characters of the paint, some additions have been used. XRD, SEM, EDS, TG, DTA and IR analysis were used to study possibility of heat resistant and other properties of coat- ing.
Tif khoa: chiu nhiet, sdn vd cd, phu gia, nano silica.
1. MO DAU
Son vd CO chju nhidt BKV id san p h l m khoa hpc do Vidn Ky thuat Hda hpc, TrUdng Dai hpc Bach Khoa Ha Ndi nghidn eyu va ehe tao. Khdng ehi ed dp ben nhiet cao, son BKV edn thdn thien mdi tn/dng va an toan ve chay nd do sti dung dung mdi nudc va eae chat vd CP nhu polyme nhdm phd't phdt, cac dxit kim loai Fe203, Ti02. Zr02, Cr203, MgO.... eae chat mdu va phu gia khae; trong dd ed eae dxit kim loai hoae phi kim loai vdi kfch thudc cd nano met, dupc b i l n tfnh de tang dp bam dinh, dp bdng, dp phan tan cda eac hat mdu trong son va mdt vai tinh ehat khae.
Cdng trinh ndy cdng b d k i t qua nghien edu sCf dung nano silica S i 0 2 - san p h l m eda de tai "Nghien cdu che tao vat lieu nano silica ta cat tring Viet Nam bing edng nghe nhiet do
thap Cmg dung trong cdng nghiep cao su va san xuat sdn' do Vidn Hda hpe cdng nghiep Viet Nam ehd tri.
2. THLfC NGHIEM 2 . 1 . Hda cha't
- Polyme nhdm phdt phat ed thdnh phan:
41,060% P2O5; 16.695% AI2O3; 42,245% H2O;
p H = 1,68.
- Cr203 (Nga): Cr203 > 95%, am < 4%, tap eha't< 1 % , dhai< lOfxm
- Fe203 (Trung Qudc): Fe203 > 96%. am <
3%, tap chat < 1 % , dhat < 10 pm - Ti02 (Han Qud'c): Ti02 > 95%, am < 4%, tap chat < 1 % , dhat < 10 nm
- Nano 8102 (Viet Nam) - san pham cda de tai "Nghidn cOu che tao vat lieu nano silica tti
CIVHC - SO a / 2 0 1 4
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caf trdng Vidt Nam bing cdng nghd nhiet do sin xuat san° vdi eac ehi tieu co ban dupc eho thap Ong dung trong cdng nghiep cao su va b bang 1.
Bang 1. Mot sochitieu cd bin cda bdt nano silica Si02
Trang C h l s « mSu R
(%)
> 9 4 Kictl thi/Sc hat
(nm) 10-12
Be mat riSng BET
(m'/g)
> 1 8 5 Kfch thudc lo x6p (nm) 15-30
T9 trong dd adng (g/cm=) 0,15-0,17
Dd tham ddu (ml/IOOg) 250-270
pH
> 5 H i m luting SiO:(%)
>99,8 2.2. Thuc nghiem
- Tao mau nghidn eiJu bang each bd sung true tiep phu gia nano-Si02 vao san pham son vd CO chju nhiet thuong pham vdi hdm lUpng 0%, 5%,' 10%! 15% va 20% tinh theo khdi lupng son; sau dd khuay trpn deu b nhidt dp phdng khoang 30 phut de dam bao kha nang phan tan deu cda phu gia.
- Hon hpp sau dd dupe kiem tra kha nang phan idp, kha nang eo cum tao tap hop hat, t^
trpng, dp nhdt, dp bam dinh, thdi gian khd va dugc sd dung di san phu len cae mau theo tieu ehuan cda phdp do.
- Khao sat vd danh gia thanh phan, tinh c h i t ca - iy - hda, kha nSng chju nhiet eda mang son theo cac phuong phdp: phd hdng ngoai (IR), phan tich nhiet (TG/DTA), kfnh hien VI dien t d quet (SEM), nhieu xa tia X (XRD)...
3. KET QUA V A THAO LUAN
3.1. Kha n i n g phan tan va tao lien ket hda hoc cua nano Si02 t r o n g he s o n
Kd't qua nghien cdU cho thay vdi lUpng s d
dung t u 1 % d i n 2 0 % so vdi khd'i lUpng son thanh pham (khdng cd chat mau), kha nang phan tan cda nano Si02 trong san r l t tdt;
khdng ed hien tUpng sa lang hoae phan Idp;
hdn hpp thu dupe d dang gel, mau trang trong sud't. Khi tang lUpng stf dung Si02 trong son, dd nhdt va dp dam dae eda sPn eung tdng len theo; nguyen nhdn do tinh c h i t cda he mao quan xd'p, ed kha nang hut nudc cao cda nano 8102. b lupng si!f dung nano- 8102 - 5%i. dp nhdt cda he tang khoang 10%.
K i t qua nghien cufu dac trung hda ly cda he theo phuang phap pho hong ngoai (hinh 1) eho tha'y tren gian do xuat hien eae pic dao dpng dac trung cho cac lien k i t hda hpc glu'a 8i02 vdi mpt s d thanh phan trong he son (lien k i t 0 - H iJfng vdi budc sdng 3600- 3700 c m ' , lien ket H-O-H Lfng vdi budc sdng 1600-1700 c m ' , lien kd't 81-0-81 Lfng vdi bUde sdng 1093,9 c m ' va 459,7 c m ' . Hen k i t Al- OH Crng vdi budc song 833,9 cm"^ va lien ket 8i-0-AI dng vdi bUdc sdng 567,7 cm').
Hinh 1. PhS hong ngoai cda miu san sau khi b6 sung phu gia nano Si02
CIVHC - S6 s/2014
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s u hinh tiianh lidn k i t Si-O-AI ehdng td ed the da xay ra qua trinh tUong tac hda hpe giua nano Si02 vdi chat tao mang polyme nhdm phdt phat.
3.2. A n h h u d n g cua nano-Si02 de'n t i n h chat c d ly* c u a m a n g s o n
K i t qua nghien cdU b l mat mdng son theo phuang phap Kinh hien vi dien iti quet eho tha'y d lUpng bd sung tren 10% 8i02 so vdi khdi lupng sPn, tren anh SEM x u l t hien cac ti - - - ' i n g
phan tan nen mang son thu dupc ed dp bdng ' thap, de bj ran nCft (Hinh 2). 6 lupng bd sung dudi < 10% Si02 so vdi khdi lupng son, dp phan tan cua Si02 tang len. Dae biet, khi lupng nano 8102 bd sung - 5 % so vdl khdi lupng son, tinh cha't cP ban eua he son khdng thay ddi, ra't thuan lpi cho qua trinh bao quan va thi cdng sau nay; kha nang bam dinh, dd phd va dp bdng cda mang son tang len dang ke. (Hinh'3).
Hinh 2. Anh SEM cCia mang son vdi lagng bo sung 12% nano SiOz K i t qua nghien cCfu anh hudng cua nano Si02 den dp ben udn, dp ben edo xudc va dp ben va dap cda mang son (bang 2) cho thay d lupng bd sung 5% nano Si02 theo khdi
Hinh 3. Anh SEM cOa mang san vdi lagng bo sung 5% nano SiOz lupng sPn, dp bam dinh va do ben udn cua mang son khdng thay ddi; trong khi dd dp ben va dap tang len so vdi dd'i chifng khdng bo sung nano 8102.
Bang 2. So sanh ket qua thO' nghiem nano SiOi vao son vd co chiu nhiet
Tgn ChT t[§u
Dp bam di'nh ciia m^ng son trdn kim loai, didm
Dd ben udn cCia mSng son, mm Dd bdn va iJSp. kg.cm
TiSu chufi^n cua
san BKV
< 1 1-2 1 8 - 2 0
Hdm luong phu gia nano Si02(%) 5
£ 1 1-2 1 8 - 2 5
10
£ 1 2-3 2 0 - 2 8
15 4 4-5 2 8 - 3 2
20 5 9-10 3 0 - 3 5 Khi luong bd sung nano SiO: tang len
10%, dp bdm dinh khdng ddi trong khi dd dd ben udn giam va dp ben va dap tang len. Khi lUPng bd sung nano Si02 tang ldn den 15- 20%, dd bam dfnh va dp ben udn giam kha manh cdn dp ben va dap tilp tue tang. Nhu vay, sd" dung khoang 5% nano 8i02 so vdi
khd'i lupng sdn la phd hpp hOn ea trong vide eai thien tinh chat CP i'j/ eda mang son.
3.3. A n h h u d n g cua nano-Si02 de'n do ben nhiet cua m a n g s o n
Viec nghien eCfu anh hudng eda nano-8i02 d i n kha nang nang cao dp ben nhidt eua
CIVHC - SO 8 / 2 0 1 4
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mdng son dupe thUe hidn tren mau vdi chat mdu Ti02 ed bd sung 5% nano Si02 k i t hpp vdi khuay trdn deu trong thdi gian 30 phut b nhiet dp phdng.
k i t qua khao sat mdu mang son theo phuang phdp TG/DTA ci dieu kien gia nhiet
tti nhiet dp phdng den 1300°C trong khdng khi vdi tde dp ndng nhiet lO^/phut (hinh 4) eho thay trong dai nhiet dd d i n 200=0 khdi lupng mdu giam dang ke. lidn quan den qua trinh mat nude tgf do va nudc lien ket eda
Hinh 4. Anh SEM eua mdng son ed bd sung 5% nano-Si02 trUdc (trai) va sau khi gia nhiet (phai)
Hinh 5. Gian do TG/DTA cCia mau mang son co bo sung 5% nano-SiOi
Khi nang nhidt tU 200''C d i n 600°C, do suy giam khdi lUpng mau cham hon. lien quan den qua trinh bay hpi hoae phan hdy cda cae tap chat vd eP. hCfu eo ed dp ben nhiet tha'p cijng nhu qua trinh tUPng tae cd the da xay ra glu'a eac thanh phan trong he polyme va chat phy gia nano-Si02. Khi tie'p tue nang nhidt, khdi lupng mau hau nhu khdng thay ddi d dai nhidt khdng qua 1000°C, giam nhe b dai nhiet 1000-1150°C va giam ddt ngdt d nhiet dp tren IISO'C, ehdng td rang khi bo sung them 5%
nano 8102, mang son vd ea cd kha nang chju nhiet d i n 1100°C.
Anh SEM thu dupe khi khao sat hinh thai eau true be mat theo phuong phap Kinh h i l n vi dien t d quet tren mau mang sdn trUde va sau khi gia nhiet d i n 1000°C trong thdi gian 2 gid b dieu kidn phdng thi nghiem; trude khi khao sat mau dUpe ldm ngudi b nhiet dp phdng rdi dupc lau sach nhieu lan bang bdng tam cdn 90" cho thay sau khi gia nhidt (hinh 6b) be mat Idp mang son thd han, tren be mat
^ CIVHC - S6 s/2014
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t h I y rd cae hat ehat mau Ti02 va phu gia SiQ2 va ranh gidi glu'a cac hat la c h i t lidn k i t (chat tao mang) polyme nhdm phdt phat. Polyme nhdm phot phat b trang thai dung djch la chat k i t dfnh cac hat c h i t mau va phu gia. sau khi dtigc ddt ndng b nhidt dd cao he polyme bj m l t nudc va tao thanh tinh the AIPO4 cd kha nang ben nhiet [2] ddng thdi la e h l t lidn k i t cdc hat dxit Ti02 va Si02 tao thanh Idp mang
phu chju nhiet. K i t qua nghidn ed^ theo phuang phdp nhieu xa tia X eung eho thay sau khi da gia nhiet b 1000°C trong 2 gid, ngoai pic nhieu xa cda tinh t h i FesO^ do nen kim loai tao ra, tren be mat tdp mang son xuat hidn thdm eae pic nhieu xa dae trUng cho pha tinh the eda Ti02, 8i02 (hinh 6).
K i t qua nghien cdu thanh phan eae nguyen t d tren be mat Idp mdng son sau khi
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Hinh 6. XRD mau mang son khi gia nhiet b 1000°C ti-ong 2 gid
gia nhidt theo phuong phap pho EDS (hinh 7) thanh phan sPn vd co nen cdn cd thdm cho thay ngoai nguyen t d Fe do nen thep tao nguyen t d Si chCfa ti-ong thdnh phan eda phu nen va eac nguyen t d Al, P, O, Ti ed trong gia nano 8i02.
1 - i- ~
Hinh 7. Phd EDS mau mang son sau khi gia nhiet b lOOO-C trong 2 gid
CIVUC - s o 8/2014
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4. KET LUAN
- Da nghien cdu anh hudng cda nano- Si02 den kha nang phan tdn, kha nang tao tap hpp hat, kha nang phan Idp, dp ben eo vd mpt sd tinh chat khae eda mdng son. Vdi lupng sd dung - khoang 5% nano-Si02 so vdi khdi lupng sPn, cac tinh c h i t ca ban cda he son khdng thay ddi nhifng kha nang bam dfnh va dp bdng eda mang tSng len.
- D a nghien eCru tuong tacgiQa nano-Si02 vdi eae chat trong he sPn, k i t qua thu dtigc eho thay da xay ra tuang lae hda hpc glu'a 8102 va polyme nhdm phdt phat, ed tae dung k i t dinh edc hat chat mau va Si02 tao ndn Idp mang phd chju nhiet dp cao.
- Da nghien etfu anh hudng eda ham lupng nano-Si02 d i n kha nang chiu nhidt eda mdng spn, k i t qua thu dUpc cho thay kha nang chju nhiet eda mang son khi sijf dung e h l t mau Ti62 va 5% phu gia nano- Si02 ed the eho dd ben nhiet cda mang son d i n 1100°C.
Tai lieu tham khao
1. La The Vinh. La VSn Binh (2006). Quan he gii^ eau trOe va khi ndng bin nhiet cQa vat lieu polyme nhdm phot phat, Hdi nghi khoa hpe lan thU20 - BHBK Ha Ndi, 103-105.'
2. La T h i Vinh, La Van Binh (2007). Cau trde cda polyme ph6t phat AIPOA va FePOi, Tap ehi Khoa hpe vd Cdng nghd eac trudng dai hpc ky thuat, 62, 60-62.
3. La T h i V i n h , Nguyen The Duong (2008). Polyme nhom ph6t phat va eau trOc cda nd. Tap chf Khoa hpe vd Cdng nghe eac trudng dai hpe ky thuat, 68, 83-86.
4. La The Vinh (2010). Khi ndng chju nhiet va ben nhiet cda san vd cO. Tap chf Hda hoc, 48 (4a), 485-488.
5. La T h i Vinh, Nguyen Thj Hdng PhUpng, Nguyen The DuPng, T r i n Thj Thjnh (2011).
Kha ndng chiu nhidt va chdng chay cda son vd CO trdn ca sd polyme nhdm phdt phat. Tap chl Hda hpc 49 (2ABC), 809-814.
Ngadi phin bidn:
GS. TS. N g u y i n Trong Uyen
