TAP CHl KHOA HOC
VA
CONG
NGHE
Tap 47, s6 6, 2009
Tr
69-75
NGHIEN CU'U
DO
B^N
BU'C
XA
TU' NGOAI, NHIET AM
CUA
MOT
SO MANG PHU TREN
CO
SCy NHI/A
ACRYLIC
I. NGHIEN CUU ANH
HUb-NG
CUA BAN
CHAT
HOA HOC
O^N
00
B^N
BUC
XA TU
NGOAI, NHIET
AM

cho cac
irng dung ngoai trai.
Vi ly do
kinh
te va
kT thuat,
cac
loai nhua
acrylic thuong pham thuong
la cac san
pham dong triing
hgp
giira monome acrylat, metacrylat
voi nhau hoac
vai
styren
hay cac
monome khac.
Ban
chst
va ham
lugng
cac hgp
phan trong
nhua acrylic
co anh
huang
rat lan den kha
nang
o':;_

ta co the
danh
gia dp ben
thai tiet
cua cac
mang
phti
huu
ca
vai dp tin cay cao. Tuy
nhien phuang phap
nay
thuong
doi hoi
thai gian thtr nghiem
dai.
Phuang phap
thti'
nghiem
gia
toe
trong phong
thi
nghiem
tuy
khong
mo
phong
mgt
each

de
nghien ctru
quy
luat,
ca
che
suy
giam
ctia
vat
lieu polyme
va du
bao tuoi
thg
ciia
chiing
[4 - 10].
Bai
bao nay
trinh
bay mgt so ket qua
nghien
cu'u
anh
huong
ciia
ban
chat
boa hpc den dp
ben

-I-
Nhua acrylic nhiet deo:
Sir
dung loai nhua acrylic LORIAC
AC
330-50, dang dung djch
50%,
san
pham
ctia
Longriver
(Dai
Loan)
va
nhira
acrylic PARLOID
B-66,
copolyme metyl
metacrylat/ butyl metacrylat,
a
dang
bgt, co
nhiet
do
thuy tinh
hoa
50°C,
trgng lugng phan
ttr
70.000,

dang dung djch 65%o,
ham
lupng
nhom hydroxyl 4,3%
so vai goc
nhua,
san
pham
cua
Cong
ty
cong nghiep nhua
A & P (Dai
Loan).
69
Tac nhan khau mach cho nhua acrylic nhiet ran (thanh phan B):
Sti'
dung loai polyisocyanat
Desmodur N-75, dang dung djch 75%, ham lugng nhom NGO
16%
-
17%o
so vai goc nhua, san
pham
ctia
hang Bayer (Dtrc).
- Dung moi: Da str dung toluen,
xylen,
etyl axetat, butyl axetat loai P
ctia

7310
khau mach bang N-75;
ACU2:
mang
phti
tren ca sa nhua HSU
1168
khau mach bang N-75.
2.3.
Phu-cng
phap
thir
nghiem
birc
xa tir ngoai, nhiet am '
Thti'
nghiem dp ben btrc xa ttr ngoai, nhiet am (BXTNNA)
ctia
cac mang phu dugc thuc
hien tren thilt bj Atlas UVCON UC-327-2 theo tieu chuan ASTM D
4587-91,
chl dp D (1 chu
ki gom 8 gia chieu ttr ngoai
a
60°C;
4 gia ngung nuoc
a
45°C).
Nguon bu'c xa tu ngoai la den huynh quang
UVB-313,

thu'c:
P = (D,/Do)
X
100%
trong do:
DQ,
D?
lan lugt la mat do quang
ctia
hap thu
dae
trung
ctia
nhom NT truac va sau thai
gian thtr nghiem T.
3.
KET QUA VA THAO LUAN
3.1 Bien doi hoa hoc trong mang phii
diroi
tac dung ciia BXTNNA
3.1.1.
Nghien citv bien ddi cdc hdp thu dgc tnmg cho cdc nhdm NT tren phd hdng ngogi
ciia
cdc
mdng phit trude vd sau khi thie nghiem BXTNNA
70
Ket qua nghien cii'u pho hong ngoai
ciia
cac mang
phti

CH2,
CNH, CH3,
CeH,
giam ro ret, trong do
cac hap thu
dae
trung cho cac nhom CNH va
CHT
giam manh nhat. Sau 30 chu ki thtr nghiem,
nhom CNH chi con 27,6%) trong mang
phii
ACUl,
3\,2%
trong mang phu ACU2; nhom
CH2
con 52% trong mang
phii
ACUl, 54,8% trong mang
phii
ACU2, 94,7%o trong mang phu AC2;
nhom CH3 con 75,8%) trong mang
phii
ACUl, 76,1% trong mang
phii
ACU2, 99,3% trong mang
phti
AC2; nhom
CeHs
con 84,3%o trong mang
phti

Co'
che suy giam cac nhom chirc nay tuong tu trong polyamit va polyuretan mach thang. Ham
lugng ctia nhom CH3, phan nhom
CH2
con lai va nhom
C(,H5
giam do su phan huy quang
ciia
cac hgp phan acrylat va styren
a
mach nhanh va mach chinh [5,
11,
12].
Bdng
I.
Bien doi cac hap thu dae trung
clio
cac nhom NT tren pho hong ngoai
ctia
cac hgp phan trong mang
phti
truac va sau khi thir nghiem BXTNNA
TT
01
02
03
04
05
06
So song

b
*
*
*
*
•
*
AC2
a
*
*
•
•
b
*
*
*
*
*
ACUl
a
*
*
*
*
*
*
b
*
*

09
10
11
12
13
14
15
16
17
1765;1730
1688
1638
i600;~1500
1525
-1470^
1450
1385;1365
1354;1210
1250-^1000
1100
+
700
Vc=o
(este, uretan, amit,
axit va andehit)
Vc=o
(amit, xeton)
Vc=o
(amit)
Vc=c

*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*

thich:
a: mang phu truac khi thtr nghiem BXTNNA; b: mang phu sau khi thir nghiem; *: co hip thu;
v: dao dong hoa tri;
5:
dao dong bien dang; dx: doi xung; kdx: khong d6i xirng; nf: ngoai mat
phSng;
m: manh; rm: rat manh; km: kha manh;
tb:
trung binh; y:
y6u;
xp: bj xen phu.
Ngoai phan buy quang cac nhom uretan con bj thuy phan. Qua trinh nay ciing lam giam
them ham lugng nhom CNH tren mach polyme noi rieng va trong mang phu noi chung. Co the
do la ly do lam nhom CNH giam manh ban so vai cac nhom khac.
Quan sat pho hong ngoai
ctia
cac mang
phti
ban dau va trong qua trinh thtr nghiem co the
nhan thay quy luat bien doi
ctia
cac hap thu tai 3380,
1730
cm"'
dae
trung cho cac nhom NH,
OH,
0=0
khong ro rang. Dieu nay dugc giai thich ngoai qua trinh suy giam quang boa cac nhom
amit bac hai, uretan, este acrylat von co trong mang phu lam giam cuang do cac hap thu dae

96,2
56,3
59,4
30
-
94,7
52,0
54,8
36
-
93,7
-
51,6
48
-
91,4
-
72
CH3
CNH
CiHs
ACl
AC2
ACUl
ACU2
ACUl
ACU2
ACl
ACUl
98,4

84,3
-
99,1
-
76,0
-
25,4
-
-
-
99,0
-
-
-
-
-
-
3.2. Anh
hiro'ng
cua ban chat hoa hoc cac mang phu den do ben BXTNNA
Cac ket qua nghien cuu bien doi hoa hpc
ctia
mang phu trong qua trinh
thii'
nghiem
BXTNNA bang pho hong ngoai cho thay ban chat hoa hpc
ctia
mang anh huong ro ret den do
ben BXTNNA
ctia

ciia
nhom
CtHs
(%)
Tho'i gian thir nghiem (chu ki)
100
80
60
-
40
-
20
0
d)
\
1 1 1
0 10 20 30 40
Thdi gian thir nghiem (chu ki)
Hinh
I.
Anh hucmg cua ban chat hoa hoc cua cac mang
phii
den bien doi
ciia
cac nhom NT trong mang
phii
(A)ACl, (•)AC2,
(•)ACU1
, (•)ACU2
73

va ACl. Sau 48 chu ki
thii'
nhiem, ham lugng nhom
CH?
va CH3 trong mang phu AC2 con 91,4%) va 99%).
Sau 48 chu ki
thti'
nghiem, pho hong ngoai
ciia
mang phu AC2 bien doi rat It so voi ban
dau, mang
vin
chua bj hong. Bang mat thuang co the thay mang
phii
ACU2 bj rach sau 36 chu
ki;
Mang phu
ACUl
bj vang sau 24 chu ki va bj rach sau 30 chu ki; Mang
phti
ACl bj vang sau
6 chu ki va bj rach sau 12 chu ki thtr nghiem BXTNNA.
Nhu vay, do ben BXTNNA
ctia
cac mang
phii
co the sap xep theo thu tu nhu sau: AC2 »
ACU2 >
ACUl
»

khong ben BXTNNA, bj vang ngay sau 6 chu
ki thu' nghiem va bj hong sau 12 chu ki thir nghiem BXTNNA. Mang
phti
AC2 rat ben
BXTNNA, bj suy giam khong nhieu sau 48 chu ki
thii'
nghiem. Su suy giam
ctia
cac mang
phii
ACUl
va ACU2
chti
yeu do su bien doi boa hpc
ciia
cac nhom nguyen tu CNH va
CH2.
4.
KET LUAN
Qua nghien ctru bien doi cac nhom nguyen tir trong mang phu tren co' sa nhua acrylic loai
ACl, AC2,
ACUl
va ACU2 duoi tac dung
ciia
BXTNNA bang pho hong ngoai da chpn dugc
cac hap thu tai
293
j,
1525,
1385

Ludwigshfen
- Polyacrylates, Industrial polymers
Handbook 1
(2001)588-618.
2.
Manfred Stickler,
Rtihm
GmbH, Darmstadt - Polymetacrylates, Industrial polymers
Handbook
2(2001)619-642.
3.
Benjamin B. Kine, Ronald W. Novak - Acrylic and metacrylic
polymers.
Encyclopedia of
polymer science and engneering 1 (1985) 234-299.
74
4.
Vti
Dinh Cu - Co' sa
KT
thuat nhiet dai, Nha xuat ban van hoa thong
tin.
Ha Npi,
2003.
5.
C. Deker - Effect of UV Radiation on
PoKmcrs,
Handbook of polymer Science and
Technology 3 (1989) 541-604.
6. Warren D. Ketola and Douglas Grossman - Accelerated and Outdoor Durability Testing of

The degradation of some coatings based on LORIAC acrylic resin AC 330-50, PARLOID
acrylic resin B-66 and acrylic polyol AC
7310,
HSU
1168
crosslinked by polyisocyanate
Desmodur N-75 under the influence of ultraviolet radiation, humid heat have been studied. The
obvious decrease of the CNH,
CH2,
CH3,
CtHs
groups and the formation of the products of the
photo-oxidation (the primary amine, hydroxyl, acid, ceton) during the testing process have been
proved by IR spectroscopic analysis. The humid heat, ultraviolet radiation durability of the
coatings have been evaluated.
Dia chi: Nhgn bdi ngdy
12
thdng 9 ndm 2008
Vien Ky thuat nhiet doi, VAST.
75