NGHIEN ClTU iTNG DUNG KHOANG SERICIT DE TANG Cl/OfNG KHA NANG BAO VE CHO L 6 P PHU HlTU CO
Vo Thanh Phong, Ngo Ke The, Nguyen Viet Diing, Nguyen Van Thuy Vien khoa hpc vat lieu - 18 Hoang Qudc Viet, Cau Giay, Ha ndi
E-mail : [email protected] Tom tat:
San pek-epoxy su dung khodng sericit ldm bdt ddn gia cirdng dd dugc chi tgo.
Kit qud khdo sdt linh chdt ca ly mdng san cd hdm lugng sericit thgy ddi lir 2.5- 20% chg thdy tinh chdt ca ly dugc cdi thiin vd dgt cao nhdt a ty li 10%. Cdc nghiin ciru khdc nhu khdo sdt dd bin hod chdt, khdo sdt cdu trite hinh ihdi mdng san ciing cho thdy khodng sericit dd biin tinh bi mat cd tdc dung gia cudng tdt cho mdng san.
Abstract:
The coal lar epoxy coating with sericile as additive had been prepared. The mechanical properdes of films in different amounts at the range of 2.5-20 wt%
showed that the mechanical properties were improved and reached the best when ratio of sericile is 10 wt%. The measurements of chemical resistance, paint morphology also indicated the positive reinforcing effect of surface modified sericile.
I. Md DAU
Viec sir dung cac chat ddn cho cdng nghiep son la mdt vin de quan trpng, da dugc quan tam nghien ciru tir lau. Hien nay, khi yeu cau ve chat lupng son phii bao ve ngay cang cao thi chat ddn bien tinh khdng chi lam giam gia thanh ma cdn ddng vai trd phu gia tang cudng cac chiic nang khac nhu tang tinh chit ca ly, tang do chiu thdi tilt, mai mdn, chiu nhiet,..[1,2,3].
Sericit la loai khoang chat thupc nhdm alumino silicat dang thii hinh in tinh (vi tinh thi) cd cac dac tinh chung cua mica, dd la tinh the he don ta, ciu hue ldp (ciia tii dien Al-Si-0). Cdng thirc hoa hpc chung: Ko5-i(Al,Fe,Mg)2(SiAl)40io(OH)2.nH20 [4]. Sericit tu nhien ndi chung dugc khai thac, che bien va sir dung rpng rai, dac biet d nhiing nude cdng nghiep phat triln. LTnh vuc sir dung sericit rat rpng, trong cdng nghiep dien tir, cdng nghiep dien, xay dung, cbl tao son va cac chat phii, chat ddn trong cdng nghiep nhua, cao su, trong cdng nghiep diu khi va ca trong cdng nghiep hda my phim...
Trong cdng nghiep son, sericit la mdt loai bpt ddn gia cudng chiic nang cd tac dung lam tang dp phii ciia mang son, ngan can sir xam thuc ciia mdi trudng din bl mat cin bao ve nhd cd cac tinh nang dac biet da dupe cac nha thuong mai khing dinh [5,6,7] nhu : Che chin tia tir ngoai va chdng hire xa IR; de dang phan tan, tao huyIn phii, bam dinh tdt; Cd ciu true vay, ben hda chat, each nude, chdng i. m mdc, bin axit va kilm; De dang phan tan vdi cac pigment khac va dung mdi; Ha gia thanh san phim.
Nghien cim iing dung khoang sericit dl gia cudng cho cao su va chit deo, tang kha nang bao v | cho cac ldp phii da dugc thdng bao tren nhilu cdng trinh tren thi gidi va hien tai vin dl nay van dugc nhieu nha khoa hpc quan tam. 0 Viet Nam, khoang sericit mdi dugc khai thac hiyen chpn trong thdi gian gan day nen chua dugc cac nha khoa hpc nghien cim img dung.
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Tieu ban Khoa hgc vdt lieu ISBN: 978-604-913-011-3
Hf son epoxy-pek da dugc chiing tdi trien khai sir dung de lam son lot cho cac phan ciia ket cau lam viec dudi nude, bao ve cac cdng trinh ludn tiep xiic vdi dp im cao. Vdi muc dich tang cudng kha nang bao ve cua loai son nay va de giam gia thanh san pham, cdng trinh nghien ciiu nay da sir dung khoang sericit nhu la thanh phan ddn gia cudng cho son nhd cac dac tinh cua nd nhu cau tnic vay, cd kha nang che chan tdt, chdng hire xa mat trdi cao, gia thanh hgp ly.
II. THlTC NGHIEM 1. Nguyen lieu
Khodng sericit dugc cung cap bdi Phdng vat lieu khoang, la ket qua ciia de tai nghien ciiu da dugc thuc hien tmdc day. Mdt sd thanh phan chii yeu cua sericit dugc thdng bao trong bang 1.
Bdng I. Thdnh phdn hda hgc ciia sericit nghiin ciru
Thanh phan
Si02 AI2O3 Fe203FeO
Ti02 K2ONazO MgO
Mat khi nung Dp am Dp trang
Ham luong (%)
51,4 33,73 0,05 0,04 0,27 7,16 0,94 0,21 4,8
1,0
> 80%
Nhua epoxy: Sir dung loai epicot 1001 trong dung dich cua hang Shell Chemicals Chdt ddng rdn; Versamid 115 trong dung dich cua hang Henkel
Nhua than dd; Dugc che tao tir san phim phu ciia qua trinh cdc hda cd nhifit dp chay mim 65-70 °C
Dung mdi; Xylen, Toluen, MIBK, Aceton, Butylaxetat, n-buthanol, ethanol la cac hda chat cd san tren thi tmdng.
Chdt hda deo; DOP, Chlorparafin.
Biin ddi bi mat sericit: sir dung 3-Aminopropyltrimethoxysilan (3-APTMS) cd cdng
thiic hoa hpc NH2(CH2)3Si(OCH3)3 cua hang Dow Comig
2. Che tao san
Che tao chat tao mang bing phuang phap trdn ndng chay 2 thanh phan chfnh la nhua epoxy va rihira thari da. Che tao cac mau son cd ham lugng sericit khac nhau tir 0-20%i bang each khuyech tan deu past sericit vao trong dung dich chit tao mang.
3. Phirangphdp nghien ciru
Xac dinh tinh chit ca ly mang son theo tieu chuin hien hanh: TCVN 2100-1993 (va dap), TCVN 2099 - 1993 (bin udn), TCVN 2098 - 1993 (dp cimg)
Cau tnic hinh thai ciia vat lieu dupe nghien ciiu bing kinh biln vi dien tir quet (SEM), tren thilt bi ciia hang JEOL, Nhat Ban
III. KET QUA VA THAO LUAN
Bien tinh khodng sericitTrong mpt nghien ciiu da dupe cong bd gin day, chiing tdi da tiln hanh nghien ciiu biln ddi be mat khoang sericit bing hgp chit silan 3-APTMS. Khi thir nghiem kha nang gia cudng ciia loai sericit da dugc bien ddi be mat nay cho mang son tren ca sd epoxy-pek, chiing tdi nhan thay rang, sericit da dugc bien ddi bl mat cd kha nang tuang tac pha dugc cai thien rd ret so vdi loai sericit chua dugc biln ddi bl mat (hinh 1,2).
a b Hinh I: Anh SEM mdu san cd sericU chua biin ddi bi mdt
Hinh 2. Anh SEM mdu san cd 20 % sericU da biin ddi bi mat
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Tiiu ban Khoa hgc vdt liiu ISBN: 978-604-913-011-3
Vi vay trong nghien ciiu nay, chiing tdi lira chpn loai sericit da dugc bien ddi be mat bang 3-APTMS de nghien ciiu kha nang bao ve ciia mang son cd chiia khoang sericit.
Khdo sdt tinh chdt cda san
Chiing tdi sir dung 6 loai son khac nhau cd ky hieu EP, EPS 1, EPS 2, EPS 3, EPS 4 va EPS 5 tuang img vdi ham lugng sericit thay ddi (0, 2,5%, 5%, 10%, 15%, 20%).
Tinh chat ciia cac mau son dugc trinh biy tren bang 2. C) day thay rang, khi cd mat ciia serich thdi gian khd ciia mang son dugc giam di, nhat la khd khdng bat bui. Dieu nay dugc giai thich la do sir thoat dung mdi thuan lgi hon khi cd sericits trong td hop son. Mat khac khdng loai trir kha nang qua trinh ddng rin mang son dugc thuc day nhd cac hgp chat silan cd tren be mat sericit.
Dp min cua cac mau son cd chiia sericit khdng dugc thap, phan Ion vao khoang 50 pm.
Chiing tdi da kilm tra lai kich tbudc va phan bd cua hat sericit thi thay rang, sericit nghien cim cd kich tbudc hat tmng binh nhd (16,1 pm) nhung dp phan bd ciia nd rdng, len tdi gan 200 pm. Dp phan bd hat rdng da lam anh hudng tdi dp min ciia son.
Bdng 2. Tinh chdt ciia dung dich san
Mau so'n
EP EPS 1 EPS 2 EPS 3 EPS 4 EPS 5
Do mjn (pm)
10 40 50 50 50 50
Thoi gian kho Khong bat bui
(giff) 6 5 5 5 4 4
Kho hoan toan (g'ff)
25 24 20 20 18 17
Chieu day mang son
(pm) 72,2 62,4 54,4 46 53,4 55,2 Khdo sdt tinh chdt ca ly cua mdng san
Bang 3 la tinh chat ca ly mang son ciia cac mau nghien ciiu. Tir bang nay ta nhan thay khi cd mat eiia sericit cac tinh chat ca ly ciia mang son hau nhu khdng thay ddi va dat d cac mirc cao theo tieu chuan nliu dp bam dinh va dp ben udn, dam bao cho mang son sir dung tdt.
Dp ben va dap cd bi suy giam khi tang ham lupng sericit tdi 20 %. Tuy nhien vdi gia tri 47 Kg.cm, mang son van dam bao tieu chuan cho phep
Dp Cling mang son tang dang ke khi dugc gia cudng bang sericit. Sau 1 tuan cac gia tri nay da Idn hon 30 %. gia tri cho phep theo tieu chuan, khi mang son ddng rin hoan toan cac gia tri nay tang len nhieu. Tren bang 4 cho thay khi ham lugng sericit tang thi dp cirng tang d cac mau EPS 1 den EPS 3 va dat gia tri cao nhat khi ty le sericit 10%. Tuy nhien d cac mau cd chira 15 va 20% sericit dp cimg lai hi suy giam. Dieu nay cd the do anh hudng ciia hat sericit d phan doan cd kich thude Idn.
Nhu vay sericit da lam tang dp cimg ciia mang son, giiip cho dp ben ciia son tang len, nhat la khi sir dung d nhirng nai cd tac dpng ciia ca hpc, hay bi tra sat nhu gid va cat bui.
Bdng 3. Tinh chdt ca ly mdng san
Mau son
EP EPS 1 EPS 2 EPS 3 EPS 4 EPS 5
Do bam dinh (Diem)
1 1 1 1 1 1
Do ben uon (mm)
Do ben va dap (Kg.cm)
50 50 50 50 45 47
Do cung (%) Sau
1 tuan 25,09 29,76 41,53 46,24 35,29 36,94
Dong ran hoan toan
50,1 52,4 56,94 57,76 51,65 42,12 Khdo sdt dp ben hda chat cda mdng son
De khao sat dp ben mdi trudng hda chat ciia mang son, da tien hanh ngam mau trong cac dung dich mudi NaCl, axit HCI va dung dich NaOH. Tren bang 4 thay rang, sau 48 gid ngam mau mang son ciia tat ca cac loai son chua thay cd dau hieu hu hdng. Sau 60 ngay thir nghiem, mang son EP khdng chira sericit cd bi suy giam chiit it trong dung dich axit va kiem, ciing nhu mang son EPS 1 va EPS 2 trong dung dich kiem. Tuy nhien sir suy giam nay la khdng dang ke. Sericit da the hien kha nang tang cudng dp ben hda chat ciia son.
Bdng 4. Dd bin hda chdt mdng san
Mau son
EP EPS 1 EPS 2 EPS 3 EPS 4 EPS 5
Do chju man Sau 48 h
0 0 0 0 0 0
60 ngay 0 0 0 0 0 0
Do chju axit Sau 48 h
0 0 0 0 0 0
60 ngay
-1-
0 0 0 0 0
Do chju kiem Sau 48 h
0 0 0 0 0 0
60 ngay
y y y
0 0 0 IV. KET LUAN
Sericit dupe bien ddi bl mat bing 3-APTMS tuang tac tot han vai chit tao mang ciia he son epoxy-pek, giiip cho mang san cd cac tinh nang bao ve tdt ban, dac biet la kha nang che chan.
Sericit da gia tang dp ciing cho mang son, giiip mang san khd nhanh han, ben hda chit va mdi trudng ban va it lam anh hudng tdi cac tinh chit ca ly khac ciia mang son.
Tinh chat co ly ciia mang son dat tdi uu khi ham lugng sericit trong san la 10%.
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Tiiu ban Khoa hoc vdt lieu ISBN: 978-604-913-011-3
