m i l KHOA HOC-CONG NGHE
ANH HUdNG CUA DO N H O T S0N LOT EPOXY GOC NUOC VA THdl DIEM PHUN POLYUREA DEN DO BAM DINH CUA HE SON
Vdi NEN BE TONG AM
T6m tit: Hi san phu polyurea (PUA) da va dang du^c su- dung dS bdo vi cho cac cong trinh xiy dt/ng vai nhimg mi diem wiQ/t trgi vi khd ndng chdng tfiJm, chong dn mon, chSng mdi mdn, va d$p tSt, khdng co mSi n6i vd phO vdi chiiu ddy bit ky, ddp Ong tien d0 thi c^g nhanh do t6c dg ddng rin nhanh, ddng rin trong diiu kiin mdi tnrdfng cd dd ^ " i cao, nhiit d^ thip. IQii phun phd hi son polyurea len bi tdng. ldp phO ndy se phit huy dut?c tii da hi$u qud khi nd bdm dfnh t6t vd Idm vi$c ddng thdi vdi nin bi tdng am thdng qua Idp son Idt gSc ntfdc. Trong t^c tfidng s6 inh hifdng den st/
Idm viic ddng thin ndy thl dd bdm dinh Id thdng s6 quan trgng nhit Thi/c ti, c6 rit nhiiu vin de liin quan den cdc Oidng s6 bdm dfnh gius hi son polyurea vdi nin bi tdng nhir dd nhdt vd ty li dung mdi/nhi/a cOa san Idt; dd im nin bi tdng, cu-dng dd bi tdng; cdc ^u ki$n mdi trudng; thdi diim phun polyurea lin bi tdng sau Mil dd quit san idt...
Bdi bdo niy trinh biy kit qud nghiin cOv vi inh hudng cda dd nhdt san Idt epoxy gic nudc vd thdi diim phun din dd bdm dinh cua san Idt vd cOa hi scm phO pdyurea vdi nin bi tdng im. Kit qui cho thiy cudng dd bdm dinh dii vdi nin bi tdng im cd mic khdc nhau phi^
thudc chu yiu vdo dd nhdt cua san Idt, thdi diim phun pc^yurea sau khi quit Idp san Idt Tir khda: Bi tdng. dd bdm dinh, dd nhdt, san Idt gic nudc, polyuria.
Abstract: Polyurea coating systems have been being used as the most suitable coating to pmtect the buildings with outstanding features such as: corrosion resistance, abrasion resistance, impact resistance. None of joint, cover for all of thid(ness, to meet the rapid construction progress due to the fyst hardening rate of polyurea, hardening in conditions of high relative humidity, low temperature. Impermeability. When spraying polyurea coating system to Oie concrete, this coating will promote maximum effidency and adhesion when it works simultaneous with Oie concrete sut)strate trough the primer.
i
ThS. NGUYEN O A N G KHOA TS. PHAM V A N K H O A N PGS. TS. NGUYEN TH! BiCH T H O Y Trung tam Tu' van Ch6ng an m6n va xay dirng -
Vi$n Khoa hpc Cong ngh# Xay dimg Tm^ng B^i hgc C6ng ngh$ Giao th6ng V^n tal
In the parameters affecting tfiis, ttie adhesion is the most Impottant parameter In fad, there are many issues related to the parameters of adhesion between polyurea coating system and concrete substrate such as viscosity and concentration of primer; moisture of concrete substrate, compressive strength of concrete;
environmental conditions; the spray time of polyurea on concrete after primed, etc.
This paper presents the results of research on the effect of the viscosity of water-based epoxy primer and Polyurea spray time on the adhesive strengtti between the polyurea coating and wet concrete substrate. The results showed that the adhesive strength to dry concrete substrate with different strength grades depending on the viscosity of the primer, the time after spraying primer Keywords: Adtiesion, concrete, polyurea, viscosity, water-based epoxy primer
DAT VAN oe
Polyurea ii mOt loai v§t ligu d^o, Sitqic tao ra tir phan Lpng cDa mOt thdnh ph^n Isocyanate vS m$t thanh phcin h6n hg'p nhi/a amine. Cdng ngh# phun phu sCr dung v3t ll^u polyurea Id cdng ngh$ mdi nhSt trong vbng 25 nam giin flay cua cdng nghl$p phD.
Phu polyurea c6 cSc d j c tlnh tuy$t vM nhu dbng ran nhanh, thong thu&ng thbi gian khb It hem 30 giay, th|lm chl ninh kk b nhl$t 3$ dubl CC, khbng b| anh hubng bbi hai am, vbi cdc tlnh chit ca ly dac bl$t nhu Id dO cung, db dan ddi, dO b4n ni>t, d?
b^n kdo dirt, khd ndng khdng hba a\k vd b^n nubc.
Polyurea da dugc Chung minh cb khd ndng ddc bi^t trong vi^c hinh thdnh dO ben nhanh chbng, phii vbi higu su^t cao trong cdc dieu ki$n mbi trubng khbng
KHOAHOC-CONG NGHE ttMtB thu#n lpi, v( dy nhi/ nhj#t dp d u ^ ( K i v^ dp am tren
90%, cac yeu to nay cd the gay anh hifdng tdi then gian ddng r§n, cdc tinh chSt be m|t vd phan irng hda hpc cua cdc kt^l chat phu k h ^ [1]. Ben canh dd. polyurea cd tinh chong mai mdn rat tot do cd d#c tfnh ddo dai vd dp a>ng be m|t cao. Mdt trong nhumg uti didm nol bat cua cdng nghd phu polyurea k h ^ vdi nhimg cdng nghe phtj khdc la cd t h i phu vdi didn tich va chieu day mdng phu bat ky va phu d nhirng noi md cdc loai vat li$u phu khdc khd cd tt>e t h ^ hi#n difprc. Do v|y ^u polyurea rat phu hgrp va ti4fn nang ung dgng i^t Ion ddi vdi cac cdng trinh xdy dimg [2]. Do polyurea cd kha nang ddng rdn nhanh (cd thdi gian tgo gel r i t nhanh ttidng thuwng trong khodng 3-7 gidy) lam cho polyurea Ididng kip thim thiu vao t)d tdng de cd the tao dirgrc cac lien ket vdi be tdng, dieu ndy dan den dp bam dinh cua polyurea vdi nen be tdng thap [3.4]. Li/c bdm dinh la ylu td quan tn^ng anh h u ^ g tdi tinh ndng cua Idp phu polyurea. Phu p ( ^ r e a d n phdi bdm chat vdo ldp n i n be tdng d l dem lai khd ndng t>ao vp lau ddi khdi tdc dpng cua moi tnrdng. Tuy nhien, li/c bdm dinh tgi m$t tilp gidp bj anh hifdng Icm bdi nhieu dilu kidn phCrc tgp bao gdm d$c tfnh cua v|it lieu scm Idt. dilu kidn thi cdng, phi/ang phdp ttii cdng, chat luvng vd d\ku ki^n n i n be tdng, cdch thi>c chuln bi b l mdt n i n [5]. Bdm dinh cua mdng son len be mgt nen Id mdt thdng s6 quan trpng quylt djnh d i n chit li/gng, dd b i n vd tinh ttiam my cua mang son.
o l cd di/gc l^rc bdm d(nh cao can k i t hpp cac bi$n phdp nhi/ xu* ly b l mgt nen (bao gom Idm sgch, tgo nhdm, xd ly khuyet tgt), quet son Idt... [6]. Chat ban tr§n b l m^t, lo rong, si/c cdng b l mgt be mgt khdng thich hpp vd dp I m qud cao cd the gay ra cdc van d l khdc nhau, tO cdc khuyet t$t tren be mgt Idp phu polyurea, chang han nhi/ Id rd khi. din nhl>ng v i n de nghidm trpng hon nhi/ son tdch ldp, bong rdp.
Vin de ndy se du^c khdc phgc nlu chpn lira mdt Idp scm Idt thich hpp vdi Idp phu polyurea va nen b§
tdng. Trdn t h l gidi cd nhilu tdc gia nghien cdu ndng cao dd bam dinh cua potyurea vdi be tdng thdng qua ldp som Idt, son lot di/?c siJ dgng nghien ci>u diu yeu ta scm lot gdc epoxy vd polyurethane (PU) bao gdm cd son gdc ni/dc va gdc dung mdi. Aureliano Perez vd cdc cdng sy [7] dd nghidn ci>u kha nang si> dgng mdt so h$ thdng son Idt d l si/ dgng k i t hpp vdi son phu polyurea. Kit qua nghien ciiu cung Chung minh hidu qua cdi thidn a/dng dp bam dinh vd ngan ngi>a s\f phdng rdp lidn quan d i n mdi logi scm Idt duvc li/a chpn. Thgt; t l cd nhilu bgi son VA da di/prc nghidn ci/u i>ng dgng cho h$ son phu polyurea d l tang o/dng khd ndng i/ng dgng, kha ndng t)dm dinh cua mdng phu vdi b l mat nen nhir:
son Idt acrylic, son kit epoxy, son Idt polyurettiane
I sd 3 ndm 2017
[8]. £)l dp dgng mdng phu polyurea Idn be m^t n i n be tdng tucri (be tdng mdi thi cdng chi/a khd hoan todn). hoac be tdng cd dd am cao (cdc ket cau be tdng ngam trong niroc lau ngdy can su-a chOa, didng tham. chong an mdn nhu-: B l nu^c, di/dng ong d i n nmjc, ttit/png li/u dap be tong, be tfing mdi do...) thl cdc hg son Idt thirong duvc \\fa chpn Id hd scm goc ni/dc, di/pfc si> dgng phd biln nhit Id son Idt epoxy goc nirdc. Ddi vdi b l mgt n i n be tdng cd dp cmig cao thi son Idt epoxy cd u-u the hon. Ben cgnh dd, gia ttianh cua son epoxy thip hon so vdi cdc k>gi son Idt cdn Igi. Vi v§y, trong nh&ng nam gan day, da cd nhieu cdng trinh nghidn ciru va si/ dung som Idt epoxy [5,8]. Son epoxy goc nmyc da di/p-c dira vao ttij tnrong khodng 40 nam tn/dc. Id sg- thay the cho cac epoxy goc dung mfii, gdp phan bao v§
mdi tn/dng va an todn lao dpng. Cdng nghe ndy phdt trien nhanh chdng chu y l u tt^ong c^ng nghg ve bd tfing, chat ddng rdn goc ni/dc di/pc dira ra cho phdp son lot epoxy goc ni/dc du^c thi cdng ngay tren be tfing mdi dd (bd tdng xanh). Be tdng cd hdm lu-prng am thay ddi tir khodng 4% khi dfing rdn hoan toan vd len tdi 8% trong be tdng xanh mdi d l [6], VAT Lieu Cne TAG VA T H I ^ B\ THl NGHIEM Nhu^ epoxy E18 cua hang Chang Chun Plastics, Dai Loan
Nhira epoxy E18 d dgng Ifing, cd dd nhdt trung binh, dgng Bisphenol A. Ddy l i ddng nhya pho biln nhit ddng rdn di/pc vdi amine, anhydride, polyamine hogc cdc chit dfing rdn khdc tiiy thudc vdo d$c tinh mong muon. San pham ndy cfi kha nang chju hda chat, tinh chat co ly cao, bam dinh tot. Nhi/a epoxy E18 ddng rdn d nhipt dp thi/dng hogc nhi$t dfi cao tuy thudc vdo chat dfing ran si> dgng di kdm. Mdt sd tinh chit cua nhu-a epoxy ndy cd the thiy d
Bdng 1: Thdng s6 ky thu$t cOa nhi/a epoxy E18 str dijng trong nghien cCni
Thdng so ky thu$t Khoi lugng phdn tu Dp nhbt b 25°C Mdu sac Ty trpng
Hdm lugng chat khdng bay hoi Dam vj
WPE gidy APHA
kg/lit
%
Muc chi tidu 182 -192
106 ± 1
<30 1.15-1.18 99.7 ± 0,2 Chat ddng ran A21- hang Air products cua My Chit dbng rdn A21 la chat dbng rdn gdc nubc si>
dgng vbi nhi/a epoxy. Mdt so tinh chit ky thu^t cua chat ddng rdn nay the hidn b Bdng 2.
mm
n i l K H O A HOC - C 6 N G NGHE
Sang 2: Thdng s6 ky thuit cua chit ddng rin A21 sir di^ng tiong nghien cCru Tgn chl tieu
Trgng thdi D d n h b t b 2 5 ° C Gid tri amine Ty trgng Hdm lugng chdt rdn Gid tri ducrng lugng gam
Li^u lugng sO dgng vbi epoxy khuySn cdo
Oomvj Ibng gidy mg KOH/g
kg/lit
%
%
MLPC chi tieu Mau vdng nhgt
51 ± 1 150-190 1.05 ± 0 . 0 5
91.5 ± 0 . 2 3 0 O ± 5 1 4 0 * 1 8 0
Sdng 1: Thdng so ky thu$t cua nhi/a epoxy E18 sir dgng trong nghiin cuu
Thdng so ky thu^t Khfii lugng phdn tu DO nhdt b 25"C Mdu sdc Ty tnjng
Hdm lugng chdt khdng bay hcri
Dom vj WPE
gidy APHA
kg/lit
%
Mirc chi Udu 1 8 2 - 1 9 2
106 ± 1
< 3 0 1.15-1.18 99.7 ± 0.2
Chit ddng rdn A21- hang Air products cua My
Chit ddng rin A21 Id chit dbng rin gdc nubc su dyng vbi nhga epoxy. MOt s6 tfnh chit ky thudt ciia chit ddng rin ndy t h l hidn b Bdng 2.
Bing 2: Thdng s6 ky thu$t cia chit ddng rin A21 sir dt,ing trong nghiin ciru Ten chl tidu
Trgng thdi Bd nhbt b 2S°C Gid tr| amine Ty trgng Hdm iugng chit rdn Gid tr| duang lugng gam LiSu lugng si> dgng vbi epoxy khuydn cdo
Oom vj Idng gidy mg KOH/g
kg/lit
%
%
Mi>c chi tidu Mdu vdng nhgt 51 ± 1 150-190 1.05 ± 0 . 0 5
91.5 ± 0 . 2 300 ± 5 140 <• 180
Bang 3: Tlnh chit ciia miu bi tdng M3 va M6 rt
1 2
hl$u mau
M3 M6
H i
33.8 66.3
Cirfrng d$u6n (MPa)
5.6 8.6
Cir6ngd$
djnh bing nhigllt
(MPa) 3.0 4.8
Khii luvng riing (gteiie)
2.64 2.69
Khii luvtigttii
tich(ldil siy klid) (kgtafl 2.315 2.402
Bi in. nin
(*)
»3.5
> 3 . 0 Phuang phdp che t?o som Idt epoxy su dyng trong nghidn ciru
TrOn nhua epoxy E18 vbi chit dbng ran A21 vd nubc se tgo thdnh son epoxy g6c nubc, trdn theo ty le El 8 : A21 = 1.0 :1.5. Tji I I nubc duvc cho vdo d l dilu chlnh dg nhbt vd hdm lugng nhua cua scm Idt.
Thilt bi thi nghi#m
• Su dgng thilt bj kdo dirt DYNAZ16.
• Thilt bi do dS I m n i n bd tdng Extech M023Q.
• Thilt bj do chilu d i y mdng son Elcometer A456CFBS.
Cdc tidu chuln thl nghllm
• DO nhbt cOa scm TCVN 2092:2008.
• BO bdm dinh cua son vbi nen TCVN 9349:2012.
• Thbi gian khd cua mdng son TCVN 2096:1993.
• Chilu ddy mdng son TCVN 9406:2012.
K£T OUA VA BAN LUAN
Moi quan h$ giira dO nhd't vd ty If dung mdl/nhya cua sen Idt epoxy g6c nud'c:
Trong de tdi sO* dgng son Ibt epoxy g6c nubc d l qudt Ibt cho nin bd tdng I m . D l tdi sip dgng nhga epoxy El 8, chit dbng ranA21 vd dung mdi nubc d l tgo ra cdc son Idt epoxy g6c nubc cb dd nhbt vd ty lg dung mdi/nhya (D/N) khdc nhau phgc vy nghidn ciru. Cdc logi son Ibt epoxy g6c nubc dugc ky hidu Id A l , A2, A3, A4, A5, chi tilt thdng s6 ky thu|lt ciia cac logi son ibt nhu sau
Sdng •*: Thdng s6 ky thuit son Idt epoxy g6c nuiK
Be tdng
Diic cdc mau be tdng cd mdc khdc nhau vd sir dyng d l phu hd son polyurea phye vy cho cdng tdc nghien ci>u. Cdc mdc be tdng trong nghidn ciru ndy bao gim M30, M60 dugc ky hidu tuong ung Id mlu M3 vd M6 vbi mOt s4 tinh chit ky thugt nhu b Bdng 3.
n
1 2 3 4 5 6 7
Th6ng sd
E>OnhM(giSy) Ham liriTng nhtra (%) Lirpng dung mfii {%) Tyi$ dung m6^nhi;a (D/N) Ttioi gian kh6 se m5t (gift) Th&i gian kll6 thiu c^p 1 (gid) Thiri gian kti5 thAu ( i p 2 (gifr)
Ky hi$u Sim I6t g6c nifdc Al
21 40 60 1.5 7 i 0 . 5 29±1 68±1
A2 31 50 50 1.0 7 t 0 . 5 2a±1 6 5 * 1
A3 45 60 40 0.67 6±0.5 2711 62±1
A4 68 70 30 0.43 6 i 0 . 5 26±1 59±1
AS 82 80 20 0.25 510.5 2511 5611
Sd 3 nam 2017 I
KHOA HOC - C O N G NGHE l l l l l Hinh 1 bilu thj mli quan hd dd nhbt phy thudc vdo
ty lg dung mdi/nhi/a (D/N) ciia son Ibt epoxy g i c nubc, vd thiy ring mli quan hg ndy cb dgng tuyin tlnh. Phuang trinh cb dang: y = -48,665 x +86,858, trong db y Id dg nhbt; x = D/N Id ty Id dung mOi/nhya, nghTa la tucmg img vbi dd nhbt nhat djnh thi cb the xdc dinh dugc ty lg D/N tucmg irng va ngugc lai.
Bing 6: Kit qui thl nghiim inh huong cua chiiu day mang son IdtAA din cuimg id bim dinh giira
san tdt vi nin be tdng am M,
11. Mii quan hi do nhdt vi ty li D/N cue san Idt epoxy gic nuac
Anh hudmg cua chieu ddy mdng so'n Idt d i n 6^
bdm dinh cua n i n be tdng I m :
D l xdc d]nh dnh hubng ciia chilu ddy mdng son Idt din dd bdm dinh giu'a son Idt vd nin bd tdng I m , de tdi tiln hdnh sir dyng thir son Idt Al vd A4 trdn nin bd tdng I m M, vd M,. Kit qud dugc t h l hidn 6 Bdng 5 vd Bdng 6.
Bing S: Kit qui thl nghiim inh huang cua chiiu diy ming son Idt At den aiimg do bim dinh giira
son Idt vi nin bi tdng im M,
TT
1
2
Chi tidu
Cubng dd bdm dinh ciia sonldtAI trdn ndn bd tdng I m M3 (MPa) Cubng dd bam dinh ciia sonkMAI trdn ninbd tdng dm M6 (MPa)
Cudmg dd bdm dinh (MPa) theo dinh muc somldtA1,g/mMchilu
day pm) 150 (45) 2.0
4.0 175 (52) 2.1
4.0 200 (61) 2.0
4.1 225 (70) 2.1
4.0 250 (78) 2.1
4.0 TT
1
2
Chitieu
Cubng dg bdm dinh cua son Idt A4 trdn nen be tdng I m M3 (MPa)
Cubng do bdm dfnh cua son Idt A4 tren nin be tdng I m M6 (MPa)
Cudrng dO bdm dinh (MPa) theo dinh muv som Idt A4, gim' (chllu ddy pm) 150
(91) 2.7
4.1 175 (106)
2.7
4.1 200 (123) 2.6
4.2 225 (139) 2.7
4.2 250 (154)
2.6
4.1
K i t qud cOa Bang 5 cho thay, trong khodng djnh md'c tieu hao ciia son Ibt A l tii 150 g/m' den 250 g/
rri' tucmg duong vbi chilu ddy mdng son Ibt Id 45 pm d i n 78 pm thl cubng dd bdm dinh khdng cb su thay d l i ddng k l .
K i t qud cung tucmg tu nhu Bang 6, trong khoang dinh muc tidu hao cua son Idt A4 tir 150 g/m^ d i n 250 g/m= tuong duong vbi chilu ddy mdng son Ibt Id 91 pm d i n 154 pm cubng dd bdm dinh khdng cb su thay dli ddng k l .
Anh huomg ciia chilu ddy Ibp son phii polyurea den dO bdm dinh vdn n i n bd tdng I m : K i t qud cho thiy cubng dd bdm dinh g i n nhu khdng thay d l i khi chieu ddy Ibp son polyurea nim trong khodng 1,0 mm d i n 3,0 mm.
Bing 7: Anh hudng ciia chiiu diy ming ldp san phu polyurea den di bim dinh v&i nin bi tdng im
TT 1
2
Chi tieu Cubng dg bdm dinh trdn nen be tdng I m M3 cb son Idt A l , MPa
Cubng dd bam dinh tren nen be tdng Im M6 cd son ldtA4, MPa
Chllu ddy Idp som phu polyurea (mm) 1.0
1.8
3.1 1.5 1.7
3.2 2.0 1.7
3.1 2.5 1.7
3.1 3.0 1.8
3.2
Anh huvng cua dp nhdt khdc nhau den dp bdm dinh cda som Idt van ndn be tdng km:
o l xac dinh dp bdm dinh cua son Idt cd dO nhfit khac nhau vdi nen bd tdng km, d l tdi da (i/a chpn 5 logi son Ifit epoxy g6c nLfdc ti> A1 -»• A5 dd nghidn cdu tren nin bd tdng I m M, vd Mg. Ket qud v l cifdng dp bam dinh ndy cd t h l thay d Hinh 2.
I s6 3 nam 2017
# f f # f KHOA HQC - C O N G NGHg
Cu^ng dd bdm dinh glOa son phu polyurea vdi nen be tdng I m M,
fiang 8: Cudng dd bdm dinh giira scm phu polyurea vdi nin bi tong im M^ d thdi diim phun khdc nhau
Hinh 2. Anh hudng cua san Idt cd dd nhdt khdc nhau din dg bdm dinh vdr nin bi tdng im M^ vd M^
Qua thi nghigm khdo s^t ndy cho thiy, doi vdi son Ifit gic nu-dc, cu-dng dO b^m dinh d l i vdi nin bd tfing I m M3 v^ M^ Id khdc nhau tu-ong Crng vdi son Ifit cd dd nhoi khdc nhau. Vdi nen be tfing I m M^, cu-dng dd b^m dinh ban d i u tang khi son Ifit cfi dO nhfil tdng td 21 giay din 68 giay, sau dfi thl gidm d i n khi dfi nhfit tdng Idn d i n 82 gidy. Vdi n i n bd tdng I m Mg, cu-dng dd bdm dinh ban d i u tdng khi son Ifit cfi dO nhfil tang tu- 21 gidy din 45 gidy, sau dfi thl gidm din khi dd nhdt tdng Idn den 82 gidy. Khodng xuat hi§n ci/c trj cua cud'ng dp b^m dinh d l i vdi nin bd tfing I m M3 vd M^ Id khdc nhau tuong LPng vdi d0 nhfil cua son Ifit lan lifpl \d (45 - 82) gidy vd {31 - 68) gidy.
Anh hird'ng thdi dilm phun polyurea den dd bdm dfnh vdi n i n bd tdng am:
Thdi dilm phun polyurea len Idp son Idt dnh hu'dng nhilu din dfi bdm dinh cua polyurea vdi son Idt, ding nghTa vdi vigc dnh hirdng tdi dp bdm dinh cua hd son polyurea vdi nin bd tfing. Vi^c phu polyurea Idn son Ifit sdm qud hay muOn qud deu cho k i t qud Id dO bdm dinh thip. phun sdm qud thi dnh hu-dng din qud trinh bay hoi cDa dung mfii Idm cho qud trinh dfing rdn cua son lot khdng hoan toan, phun mupn qud thi son Ifit da dfing rin hodn todn sd khfing phdn t>ng vdi polyurea dupc. Nghidn cdu thdi dilm phun son polyurea sau khi qudt son Idt epoxy gic nu-dc ti> 6 gid din 120 gid. Chilu ddy son polyurea Id 2 ± 0.2 mm.
TT
1
2
3
4
5
6
Thon diem phun sau khi quit I6t(gli>)
6
18
24
48
72
120
Cvdng d$ t)dm dinh giifa scm phO polyurea vdi nin U tdng Im M^ c6 quet sen Idt khic ntiau, MPa
Al
1.0
1.3
1.8
2.0
1.8
16 A2
1.2
1.4
1.9
2.2
1.9
17 A3
1.3
1.6
20
2.5
2.0
17 A4
1.4
1.9
2.5
3.0
2.2
1.6 AS
14
1.8
2,3
2.6
22
1.6
Thirl didm pHun sau khi quM kH (gKr) Hinh 3. Anh hudng cOa thdi diim phun din cudng di bim dinh cua hi phu polyurea vdi nin tii Idng
amfj..
Qua thl nghidm khdo sdt ndy cho t h i y khodng xuit hidn cue tri doi vbi n i n bd tdng I m M, tuong irng vbi thbi dilm phun sau khi qudt son Idt Id tir 24 - 72 gib.
sd 3 nam 2017 I
KHOA HOC - C O N G NGHE l l l l l Cudmg d$ bam dinh giua son phu polyurea vdn
n i n bd tdng I m M,
8ang 9; Cudng di bam dinh cQa ldp son phi potyurea vdi nin bi ting im-M,a thdi diim phun
khic nhau
n
1 2 3 4 5
«
TtlM dilm phun sau Mil quet lot (gi*)
6 18 24 48 72 120
Cirdng dd bam dinh giira som phu polyurea vdi nen be tong I m M, cd quit som lot khac
nhau, MPa
Al 1.2 2.5 2.6 3.1 2.9 17
A2
1.3 2.8 3.0 37 3.2 17
A3
1.4 2.9 3.8 4.7 3.6 17
A4
1.3 2.8 3.1 3.6 3.2 1.6
AS
12 2.6 3.1 3.4 3.0 1.6
Hinh 4. Anh hudng cOa thdn diim phun din cirdrtg dd bim dinh ciia hi phu polyurea vdi nin bi tdng
imM^
Qua thi nghidm khao sdt ndy cho thiy cung tuong tv dli vdi n i n be tdng am M6, khoang xuit hign ci/c trj dli vdi nin be tfing I m M6 tuong dng vdi thdi diem phun sau khi qudt son Idt la tCr 24 - 72 gid.
K£T LUAN
• Cudng Qd bdm dinh cua son Ifit epoxy gdc nu-dc vdi nin be tong am M^ vd Mg dgt gid trj Idn nhat Id khdc nhau tu-ong i>ng vdi dp nhfit son Ifit lln lupt la 45 - 82 gidy vd 31 - 68 gidy.
• Cipfi^g dO bdm dinh cua hp son polyurea vdi nin t)d tdng I m dgt gid trj Idn nhat Cmg vdi thdi I s l 3 ndm 2017
dilm phun polyurea sau khi qudt Idp son Idt epoxy goc ntfdc Id 24 - 72 gid.
Hp son PUA bdm dinh tot tren n i n bd tdng I m khi \\jta chpn dup^c son Idt gdc nirdc co dp nhdt, ty Ip D/N vd thdi dilm phun polyurea len bd tdng dd quet son Ifit hpp ly •
T A I u e u THAM K H A O
1. Huynh DUPC Minh (2006). "Khodng V9?/jpc Silicar, ^4XB Khoa hpc vd K? thu#t.
2. Nguyin Tiln Thdnh (2012), "Nghiin cdu chi fgo vd si> dvng vOa m^ch mdng cho khoi xdy bi tdng khi chimg dp', Lu^n dn tiln sT ky Hiu§t.
3. Ph.D Edwand P. Squiller (2003).
"Po/ya^7arifCs; An Aliphatic Coating Technology for High Productivity Applicatk>ns', Bayer Material Science LLC.
Voelkel industie Produkte GmbH (2011).
'A paper presentation on pure Polyurea vs Hybrid Pr^yurea / polyurethan & Epoxy", SSPC2011 New Delhi.
Murphy Mahaffey (2011), 'Polyurea is Specified as the Best Dam Coating', SSPC 2011 Conference Proceedings!
Swaraj Paul (1995), 'Surface Coatings:
Science and Technology', John Wiley
& Sons , ISBN: 978-0-471-95818-5, tr.
336-339.
Calvin C. Shen Aureliano Perez (2000), 'Performance Enhancements of Aromatic Pr^yurea Spray Coatings by the Use of Conventional Primer Systems", Presented at the Polyurea Development Assodatlon in New Orleans, Louisiana.
^
Edward M. Petrie (2012), 'Fundamentals of Paint Adhesion', SFCHINA2012.