Tap chi Khoa hgc va Cong ngh? 103 (2014) 098-103
Nghien cmi che tao nhva sinh hoc Bio-Epoxy
tir dan hat cao su tho cua Viet Nam bang phu-oug phap truyen thong Investigation on Producing Bio-epoxy Based on Raw Rubber Seed Oil of VietNam
by conventional epoxidation
Nguyin Thi Thuy*, Vu Minh Due, Nguyen Chau Giang, Nguyen Thanh Liem
Trung tdm Nghien cdu vdt lieu polyme, Tnrang Dai hoc Bdch khoa Ha Noi Sd 1, Dai Cd Viet, Hat Bd Tnmg, Hd Npi
Din Toa sogn 02-7-2014, chdp nhdn ddng 28-10-2014
Abstract
Nowadays epoxidized vegetable oil is having great concern as they obtain from sustainable renewable natural resource and are environmental friendly. Epoxidied vegetable oil can act as a raw material for synthesis of vanety of chemical Including poiyols, glycol, carbonyl compound, lubricants, plasticizer for polymer, matrix for polymer composites ect. because of high reactivity of oxirane ring. This paper presents the conventional epoxidation of raw rubber seed oils of Vietnam with peroxyformic acid generated In situ by the reaction of 30% hydrogen peroxide with formic acid. The success of this reaction was demonstrated by FTIR spectmm analysis The reaction was carried out at 50°C, 60°C and 70°C and the mole ratio of double link to H20z varied from 1:1.5 to 1.3.5. The influence of stirring speed on heterogenous epoxidation reaction was also studied. The present of solvent reduced remarkableiy side reactions The epoxidized rubber seed oil with oxyran content 3.65% obtained was mixed with epoxidized linseed oil to produce man-stone.
Keywords: Epoxidation of vegetable oils, Rubber seed oil, Epoxidation of rubber seed oil, Man-stone Tom tat
Ngay nay, diu thwc vat epoxy hoa dang rit dwgc quan tam do chung khdng chi thin thi$n mdi trwang ma cdn dwac sin xuit tw cic ngudn tw nhlin tii t^o dwgc. Do ho^t tinh cao cCia vdng oxyran nin diu thwc v$t epoxy hda cd thi ddng vai trd nhw nguyen lieu thd cho tdng hgp cac hgp chat hdu ca khic nhw polyol, glycol, cic hgp chit cacbonyl hoac dung lim chit bdi tran, chit hda deo cho polyme ho$c lim nh\^ nin cho vit lieu polyme compozit... Bii bio niy gidi thieu vi phin iing epoxy hda bing phwang phip tmyen thong giiia dau hat cao su thd cua Viet Nam vgi peroxyformic axit dwgc sinh ra bing phin iing in situ cOa hydro peroxit 30% vdr axit formic. Sw thinh cdng cua phan iing da dwgc chiing minh bing phi FTIR. Phan ling dwgc thwc hiin a 50°C, 60°C vi 70°C vi ti li moi gida ndi ddi trong diu h^t cao su vdi H2O2 thay doi tir 1:1,5 tdi 1:3,5. Anh hwang cua tie dd khuiy trdn din phin wng epoxy hda di thi cung dwgc nghien cwu. Si/
cd mat cua dung mdi cung lam giam dang ke cac phan ting phg. San phim epoxy hda diu hat cao su thd cua Viit Nam cd him Iwgng oxyran 3,65% dwgc phdi tron ciing vcri dau lanh epoxy hda di chi (90 ihCr nghiem da nhan tao.
Tir khda: D^u thirc vat epoxy hda, d§u hat cao su, d4u hat cao su epoxy hoa, da nhcin tao
I . M d - d a u DSu hat cao su (DHCS) la vat lieu hoan toan X i.--„ - - >i- 11,- - a - - u = than thien mdi tnrdng. Hien nay, tren the gidi dau hat I rong nhimg nam ean day, khi van de o nhiem * , , ' : . ... A . , , . . . . . . . , . ° i . - - . \ _ ,L- u - - cao su duoc ung dung rat rgng rai. O My va moi trucmg dang tto nen nghiem ttong thi nhimg vat . , j"i ^ * j . *; . - 1" .u- Tu-- '• -• ._ • • " 3 . - ' Argentina dau hat cao SU dugc dung de che tao son lieu than thien voi moi truong cang duoc quan tam , . . .. ,, " . ,.„ . - i-- -^ i-
^u.;,;«w- k™ T: ' - • ^ ' j ' • -• dien di, lam nguyen heu cho vat lieu compozit, lam chu y nhieu hon. Epoxy CO nguon goc tu dau mo vm . , . ,, " r .t •,, , . _ ' , _ . .
• t- u u-t •-. • ' u i - i - L .i~ - xaphong, lam dau dot, am thuc an chan nuoi...
cac tinh chat uu viet cua minh la loai nhua da va
dang duo'c sii dung rat rdng rai trong nhieu ITnh vuc Vi6t Nam la nude diing thii nam v l san lugng ling dung nhung nhugc diem Idn nhat la phe thai ciia cao su thien nhien va thii tu ve xuat khau cao su thien chiing lai khdng the t u phan hiiy ttong mdi trudng. nhien, sau Thai Lan, Indonesia, Malaysia vdi dien Vi vay, nhua epoxy cd ngudn gdc tai tao va cd thd tu tich duy tri dn dinh tdi nam 2015 d muc 800.000 ha phan hiiy nhu nhua tir d i u thao mgc epoxy hda da va va 1,2 trieu t§n cao su thien nhien hang nam. Vi vay, dang dugc nghien cmi cung nhu iing dung rat nhieu san luong dau hat cao su thu dugc hang nam la rat dac biet d cac nude tien tien tten the gidi [1-2]. Idn, Tuy nhien, dau hat cao su nay chii yeu mdi chi dugc diing lam dau ddt, thirc an chan nudi va lam xa phdng. Da md rgng ITnh vyc iing dung ciia d i u hat cao su nhu diing lam nguyen li^u sinh hpc cho son, cho v$t lieu compozit... can thiet phai nghien ciiu
• Dia cbi hen he- Tel; (-+-84) 904505335 Email: thuy [email protected]
T?p chi Khoa hoc va Cong nghe 103 (2014) 098-103 bien tinh dau hat cao su d6 nd cd dugc cac tinh chat
dap ling cho nhimg irng dung nay. Epoxy hda dau hat cao su la mdt ttong nhirng hudng nghien ciru nay
Hien nay, tren thi gidi cd nhilu phuong phap epoxy hoa dau thuc vat nhir phuong phap truyen thdng, phucmg phap nhua trao ddi ion, phuong phap xiic tac kim loai, phuong phap enzym... Trong do, phuong phap truy&n thdng dugc su dung rat rdng rai vdi phan iing giua ndi ddi ttong dau vdi peroxy axit va dugc xiic tac bdi axit vd co [1 -3].
Epoxy hda diu thyc vat bang phuong phap trayen thong la phan iing di the. Day la phan ung rat phirc tap vi song song vdi phan iing chinh gdm hai giai doan (giai doan mdt hinh t h ^ h peroxy axit (1) va giai doan hai la su be gay ndi ddi ttong dau bang peroxy axit mdi hinh thanh (2)) cdn cd cac phan umg md vdng epoxy (3) [ 1,4].
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Phan ling epoxy hda diu thyc vat chiu anh hudng ciia rit nhilu y l u td nhu nhiet do, thdi gian, thanh phan nguydn Heu, tdc do khuay ttdn... [5, 6].
Nghien ciiu mdt each cd he thdng ve cac yeu td anh hirdng den phan iing epoxy hda dau hat cao su thd ciia Viet Nam de che tgo nhya sinh hoc Bio-epoxy la npi dung ciia bai bao nay.
2. Thirc nghidm 2.1. Nguyen lieu
D i u hat cao su thd ciia Viet Nam vdi chi sd axit 56 mgKOH/g va chi sd iot 134,6 gIVIOOg. Thudc thii Wijs cua Mecrk (Diic). Axit bromic 3 3 % ttong axit acetic ciia Sigma-Aldrich (My). Hydroperoxit 30%, (Trung Quoc), diu lanh epoxy hda (ELO) (My),
metyl hexan hydropbatalic anhydrit (MHHPA) (My), I-metyl imidazone (NMI) (Thugng Hai Trung Qudc), hat thgch anh dudng kinh tnmg binh 2,5 mm ctia Viet Nam va mdt sd hda chat khdc.
2.2. Phirffng phdp nghien ciiru
2.2.1. Ddu kgt cao su vd ddu hgt cao su epoxy hoa Phan tich phd hdng ngoai dugc thyc hien tten may Tensor 27 (Bruker). Chi sd iot, chi sd axit, ham lugng nhdm epoxy duoc xac dinh lan I u 0 theo tieu chuin ASTM D1652, D1980-87'va 05768-02.
2.2.2. Dd nhdn tgo
Cac tinh chat dac tnmg ciia da nhan tao dugc xac djnh tai Trung tam Nghien ciiu va Phat ttien (R&D center) cua cdng ty c^ phan Vicostone. Dp hap thu nude dugc xac dinh theo tieu chuan EN: 14617-1.
Dp ben udn dupe xac dinh theo tieu chuan EN:I46I7- 2 tren may FLEXI (hSng Gabbrielli cila Y) Dp chiu mai mdn sau dugc xac dinh theo tiSu chuSn EN:14617-4 tten may DEEP- Model GT 0109 (hang Gabbnelh ciia Y). Do ben va dap duoc xac dmh theo tteu chuan EN:14671-9 tren may do va dSp ciia Nhat.
Do Cling Barcon dugc xac djnh theo tieu chuan TCVN-64I4-18
2.3. Tong hffp dau h^t cao su epoxy hda Dau hat cao su epoxy hda (DHCS-E) dugc tdng hgp theo so dd hinh I,
Hinh 1. So do quy trinh tdng hgp dau hat cao su epoxy hda
D I U hat cao su va cac chat phan icng dupe cho vao thiet bi phan img, H2O2 dugc nhd gigt vdi tdc dO vua phai. He phan iing dugc nang tdi nhiet dp phan ling. San phSm phan iing dugc chiet tach, nia bang nude ndng va say khd.
2.4. Phuffng phdp che tgo dd nhdn tgo Da nhan tao tten nen nhya dau thyc vat epoxy hda gia cudng bang hat thach anh dugc che tao tgi Trung tam Nghien cihi va Phat trien (R&D center) ciia cdng ty cd phan Vicostone,
T?p chi Khoa hoe va C6ng nghe 103 (2014) xxx-s
Hinh 2. Bieu do phan tich IR
3. Ket qua va thao luan
3.1. Che tgo nhua sink hpc Bio-epoxy 3 11 Phdn lich pho hong ngogi cua ddu hgt cao su vd ddu hgt cao su epoxy hoa
Tdng hgp diu hat cao su epoxy hda ttong binh cau 4 cd tai nhiet dp 60''C vdi ty le mol ndi ddi ( B D ) / H 2 0 2 / H C 0 6 H - 1/2/0,5 va xiic tac H2SO4 2 % tdng khdi lupng cua dung dich H2O2 v i HCOOH.
Mau sau khi tong hgp dugc nia sach va say khd de thu dugc san pham DHCS-E sach
Trong qua trinh epoxy hda ndi ddi ttong DHCS dugc chuyen hda thanh nhdm epoxy. Do do, de khang dinh phan img hda hpc epoxy hda da dien ra tiic li ndi ddi da chuyen thanh nhdm epoxy tten hanh phan tich phd IR cila man DHCS-E sach so vdi man ddi chiing DHCS, Ket qua phan tich trinh bay tten hinh 2.
Tir bieu do phan tich IR nh$n t h i y pic h i p thu tai sd sdng 3010 cm"' (dac trung cho lien k i t ddi - C^C- tten phd hap thu cua dau hat cao su) da khdng cdn xuat hien tten phd hap thu cua dau hat cao su epoxy hda DHCS-E dilu nay chiinp td hen k i t ddi ttong dan hat cao su da bien mat. Ddng thdi, lai thay xuat hien cap pic hap thy d sd sdng 852 cm'' va 912 cm'' dac tnmg cho vdng epoxy d phd hap thy cua dau hat cao su epoxy hda DHCS-E, ma pic nay hoan toan khdng cd mat d phd hSp thu ciia d i u hat cao su ban dau. Dieu nay chiiug td r i n g lien ket ddi ttong d i u hat cao su da bien ddi thanh vdng epoxy ttong dau hat cao su epoxy hda DHCS-E. Ket qua nay chiing td sy thanh cdng cua phan ung epoxy hda diu hat cao su.
Kit qua phan tich phd IR da cho k i t qua dinh tinh ve su xuat hien ciia nhdm epoxy, nhung chua cho ket qua dinh lugng ve ham lugng nhdm epoxy ciing nhu muc dp chuyen hda ndi ddi thanh nhdm epoxy.
De thSy duac cac thdng sd cu thd nay cUng nhu mite do anh hudng ciia cac yen td tdi hieu suat epoxy hda va miic do chuydn hda ndi ddi cua phan ung phai tiln hanh phan tich hda hgc bang phuong phap chuin do cac san phSm DHCS-E khac nhau.
Hinh 3. Anh hudng ciia nhiet do den ham lugng nhdm oxyran
3.1.2 Anh hicong cua nhiet do den phdn icng epoxy hoa DHCS
Nhiet do la mdt trong nhung yeu td quan ttgng anh hudng tryc hep den qua trinh epoxy hda D6 xet anh hudng cua nhiSt dd din phan img epoxy hda ta thay ddi nhiSt dd ttong khoang 50 - 70°C, cd dinh tJ le mol BD/HCHOOH/HiOi - 1/0,5/2,5, xilc tac H2SO4 vdi 2 % tdng khdi lugng dung dich HCOOH va H2O2 vdi tdc dd khuSy trdn cd dinh 1000 vdng/phut.
San pham dugc ISy ra dinh ki theo thdi gian, sau khi nia sach va say khd dugc chuan do chi sd lot va ham lugng oxyran de tu dd xac dmh do chuyen hoa ciia ndi ddi va hieu suit phan iing theo ham lugng nhdm oxyran. Ket qua phan tich ham lugng nhom oxyran trinh bay tten hinh 3.
Tit hinh 3 ta thay vdi ca 3 nhiSt dd, ham lupng nhdm oxyran d6u tang dan theo thdi gian chiing t6 kha nang epoxy hda tang dan theo thdi gian. Ham lugng nhdm oxyran cua phan img epoxy hda d 50"C ludn thSp nhat va cao nhat la cila phan iing epoxy hoa d 60°C. Dieu dd chiing td d C C cho kha nang epoxy hda tdt hon ca, Sau 9 gid phan iing ham lupng oxyran dat 2,52% vdi phan iing 0 50''C va 2,57% vdi phan ling d 70''C cdn phan irng d 60°C dat 2,79%.
De danh gia hieu suat phan img epoxy hda theo thdi gian d nhiing nhiet dp khac nhau ta tilp tuc so sanh ham lugng nhdm oxyran thyc t l vdi ham lupng nhdm oxyran H thuyet ciing nhu danh gia dp chuyin hda ndi ddi thdng qua viec xac dinh chi sd iot. Ket qua dugc dua ra ttong bang 1.
BSng 1. Anh hudng cua nhiet do tdi hieu suat epoxy hda va dO chuyen hda ndi ddi
Thcri gian, gia 1 5 9
Hieu suat epoxy hoa
%
50°C 23,48 28,13 32,17
60"C 28,13 32,35 35,68
7(rc
24,30 29,30 32,SS
Do chuyen hoa noi 361
%
50°C 28,56 40,75 57,52
60"C 37,21 46,65 67,35
70'C 44,63 66,99 83,98
Tap chi Khoa hcjc va Cong nghe 103 (2014) 098-103 Tir bang 1 nhan thay, ciing nhu ham lugng
nhom oxyran, hieu suat phan iing epoxy hda tang dan theo thdi gian vdi ca 3 nhi?t do va hieu suat phan img epoxy hoa thyc hien d 60°C ludn cd xu hudng Idn hon so vdi thuc hien d nhipt dg 50°C va 70''C. Sau 9 gid hi?u suat phan iing dat 32,17% va 32,88% vdi pban img thuc hien lan lugt d 50°C va 70''C, cdn phan ung thyc Men d 60''C dat hieu suit cao nhat 35,68%.
Cung ttong bang 1 nhan thay dp chuyen hda ndi doi ludn Idn hon hieu suat epoxy hda cd nghia la song song vdi phan iing epoxy chuyen noi ddi thanh vdng epoxy thi ludn diln ra cac phan iing md vdng nhdm epoxy mdi tao thanh. Them nua, cimg vdi sy tang nhiet dp phan iing, do chuyen hda ndi ddi tang manh dac bi$t vdi phan iing thuc hien d TO^C dp chuyen hoa ndi ddi sau 9 gid len tdi 84%, trong khi dd hieu suat epoxy hda lgi giam d phan iing d nay. Dieu nay cho thay cung vdi su tang nhiet dp phan ung thi cac phan ling md vdng epoxy dien ra cang nhieu, CJ day chgn nhi?t dg phan iing la d C C de thyc hi$n cac nghien ciiu tiep theo.
3.1.3 Anh huong ciia hdm luong H2O2 den phdn ihig epoxy hda ddu hgt cao su
De xet anh hudng ciia ham lupmg H202 den phan ling epoxy hda ta tien hanh phan iing epoxy hda d nhiet do cd dinh 60''C, ty IS mol BD/HCOOH
=1/0,5 va xiic tac axit H2SO4 vdi 2% tdng khdi lugng dung dich H2O2 va HCOOH cdn ham lugng H2O2 thay ddi tir BD/H2O2 = I/l ,5 - 1/3,5 vdi tdc dg khuiy ttgn CO dinh 1000 vdng/phiit. Tien hanh chuan dp san pham DHCS-E, ket qua ham luong nhdm oxyran dupe trinh bay tten hinh 4.
Iugng H2O2. Ket qua nay hoan toan phu hop vdi sd lieu trong bang 2.
Bang 2. Anh hudng cua ham lugng H2O2 ddn hieu suat epoxy hda va do chuyen hda ndi doi
Hinh 4. Anh hudng ciia ham lugng H2O2 den ham lupng nhdm oxyran
Tir hinh 4 nhan thay, d tat ca cac ham lugng H2O2 ham lugng nhdm oxyran tang cimg vdi viec keo dai thdi gian phan iing. Ham lugng H2O2 tang tir BD/
H202= 1/1,5 tdi 1/2,5 ham lupng nhom oxyran tang len dang ke sau do ham lugng nhdm oxyran lgi giam mgnh n l u tilp tyc tang ham lupng H2O2 tdi BD/
H202= 1/3,5. Dilu nay cd nghia hieu suat epoxy hda tang cimg vdi sy tSng ham luong H2O2 tdi ti 1^ BD/
H202= 1/2,5 nhung Igi giam nlu tilp tuc tang ham
Thai gian, giir
Hieu suat epoxy hoa, %
Dp chuyen hoa noi aoi, %
1,5 2 2,5 3 3,5
1,5 2 2,5 3 3,5
1 26,85 28,13 29,28 27,62 22,89
35,27 37,21 41,28 36,48 31,82
5 30,95 32,35 34,78 31,97 27,11
42,74 46,65 50,99 43,27 37,16
9 33,76 35,68 37,72 36,19 33,25
60,71 67,35 72,86 69,59 58,33
Cung gidng nhu ham luong nhdm oxyran hay hieu suat epoxy hda do chuyen hda ndi ddi cung tang cimg vdi su tang ham lupng H2O2 tdi ti le BD/ H2O2 ^ 1/2,5 sau dd giam dang ke neu tiep tuc tang ham lugng H2O2. Nhin chung vdi mpi ham lupng H2O2 do chuyen hda ndi ddi ludn ldn hon hieu suSt epoxy hda cd nghTa la song song vdi phan ung hinh thanh nhdm epoxy cung ludn diln ra cac phan iing md vdng nhdm epoxy mdi hinh thanh.
3 1.4. Anh huang ciia toe do khudy tron den phdn Ong epoxy hda ddu hgt cao su
Epoxy hda dau thuc vat ndi chung va dau hat cao su ndi rieng theo phuong phap truyen thdng la phan ling di the vdi pha thii nhat la dau (khdng tan ttong nude) va pha thii hai la dung dich nude ciia H2O2, HCOOH va H2SO4. Phan iing epoxy hda se dien ra tten be mat phan chia pha nen dien tich plian chia pha cang Idn, kha nang tiep xiic giua hai pha cang ldn thi phan img dien ra cang thuan lpi. Dieu nay cd nghia la tdc dp khuay ttdn hdn hpp phan ung se anh hudng rat nhieu den phan iing epoxy hda.
De khao sat anh hudng ciia toe dO khuay trgn den phan iing epoxy hda ta cd dmh ty le BD/HCOOH/H2O2 = 1/0,5/2,5 va xiic tac axit H2SO4 vdi 2% tdng khdi lugng dung dich H2O2 va HCOOH, tai nhiet do 60°C, cdn tdc dg khuay trgn thay ddi tir 1000-^4000 vdng/phiit. Tiln hanh xac dinh ham lucmg nhdm epoxy cac san pham DHCS-E, ket qua phan tich trinh bay tren hinh 5.
Tap chi Khoa hoc va Cong nghf 103 (2014) xxx-xxx
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Hinh 5. Anh hudng ciia tdc dp khuay ttdn den ham lupng nhdm oxyran
Khi tang tdc dp khuay ttdn kha nang tiep xuc giira hai pha tang nen lam tang kha nang phan iing epoxy hda va kit qua la ham lupng nhdm oxyran tang manh cimg vdi sy tang tdc do khuay ttdn ttr 1000 vong/phiit den 3000 vdng /phut. Tuy nhien, neu ttep tuc tang tdc dp khuay trdn tdi 4000 vdng/phiit thi ham lugng nhdm oxyran h i u nhu khdng cd sy thay ddi.
Ket qua nay dupe the hien rat ro tren hinh 5.
Ciing gidng nhu ham lupng nhdm oxyran, hieu suat epoxy hda cung tang manh cimg vdi sy tang tdc dp khuay ttdn den mdt gidi han nhat dinh (3000 vdng/phiit) va hau nhu khdng tang neu tdc do khuay ttgn tilp tyc tang (bang 3).
Bang 3 . Anh hudng ciia tdc dp khuay ttdn den hieu suit epoxy hda va dp chuyen hda ndi ddi
Thoi gian, gia Hieu suat epoxy hoa, %
Dp chuyen hoa noi doi, %
WOO 2000 3000 4000 1000 2000 3000 4000
1 29,28 31,59 38,87 39,26 41,28 42,71 43,21 44,54
5 34,78 39,64 43,48 42,46 50,99 52,05 53,39 54,27
9 37,72 44,12 46,68 46,04 72,86 73,35 75,46 76,59 Ciing tir bang 3 nhan thay, cilng vdi su tang tdc dp khuay ttpn tdi 4000 vdng/phiit do chuyin hda ndi ddi tang rat nhe so vdi khi khuay ttdn d 1000 vdng/phiil. Cd nghia la tdc dp khuay ttgn khdng anh hudng nhieu tdi dd chuyen hda ndi ddi nhung lgi anh hudng rat nhieu tdi hieu suat epoxy hda ma cy the lam tang manh hieu suat epoxy hda. Dieu nay ddng nghia vdi vipc tang tdc dd khuay trdn khdng nhung lam tang phan iing epoxy hda ma cdn lam ban che cac phan ling md vdng epoxy.
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Hinh 6. Anh hudng ciia dung mdi dSn do chuyen hoa ndi ddi ttong phan iing epoxy hda
3.1.5. Anh hucmg cua dung moi den phdn ung epoxy hoa ddu hat cao su
D I xet anh hudng cua dung mdi den phan iing epoxy hda ta thyc hi^n phan ling d nhi^t dp 60°C, ty le mol BD/HCHOOH/H2O2 = 1/0,5/2,5 va xiic tac H2SO4 vdi 2 % tdng khdi luqmg dung dich HCOOH va H202 Dung mdi benzen dugc bd sung vdi ti I? thS tich DHCS/benzen = 100/20. Kit qua phan tich ham lupng nhdm oxyran cila cac mau DHCS-E ttinh biy tten bang 4,
Bang 4. Anh hudng cua dung mdi den ham lugng nhdm oxyran
Thai gian, gia Kh6ng CO mat dung m6i Co mat dung moi
1 2,29 2,35
5 2,72 2,86
9 2,95 3,05 Tir bang 4 nhgn thay sy cd mat ciia dung moi benzen h3.u nhu khdng lam tang ham lupng nh6m oxyran tiic la khdng lam tang hieu suit epoxy hoa.
Tuy nhien, dung mdi benzen lai anb budng nhilu tdi do chuyen hda ndi ddi ma cu the la lam giam mgnh dp chuyen hda ndi ddi (hinh 6). Dilu nay cho thiy sg cd mat ciia dvmg moi cUng lam giam dang ke cic phan ling phu ttong qua trinh epoxy hda.
3,2, Bd nhan tgo
Da nhan tao dupe che tao vdi 9,5% nhya nen ttong do tl le mol epoxy/MHHPA = 1,05 va NMI la 2% tdng khdi luong ciia nhya epoxy va MHHPA.
Che tgo cac mau da nhan tao M l va M2 trong dd: M l - nhya nen chiia 10% khdi lugng DHCS-E;
M2- nhya n l n chiia 2 0 % khdi lupng DHCS-E. Ket qua danh gia cac dac trung ciia da dupe trinh bay tren bang 5.
Tit bang 5 nhan thiy mSu da M I va M2 cd do hdp thy nude, do mai mdn sau va dg ciing b l mat dip ling tdt cac chi tieu cila da nhSn tgo vdi ci nhya nm PEKN va nhya n l n sinh hpc. Dp bin udn ciia mlu
Tap chi Khoa hoc va Cong nghg 103 (2014) 098-103 Ml ciing dap tmg tdt tieu chuin cua da nhSn tao vdi
ca hai loai nhya nen cdn dp ben va dap cua mau ca mau MI va M2 thi dap iing tdt tiSu chuan vdi logi da nhan tgo n l n PEKN va chi thip hon khoang 10-14%
so vdi tieu chuan cua da nhan tao nen nhya sinh hgc.
Bang 5. Cac tinh chat dac trung ciia da nhan tao
Ten chi tieu Dp hap thu ntt6c,
%
Dp ben va dap, J Dp bgn uon, MPa Dp mai mon sau.
Dp Cling be mat, mohs
Tieu chuan PEKN*
<0,027
>5,0
>57
<175
> 6 Nhira"
smh hoc
<0,027
>7,1 56 215
> 6 Mau M l 0,02 6,38 57,75
165 6
M2 0,023 6,13 53,44
174 6
* Tieu chuan dd nhdn lao nen polyeste khong no (PEKN)
** Ti&u chuan da nhdn tao nin nhyra sinh hoc 4. Kit lugn
Nghien ciru dinh tinh bang phd IR cho thay phan ling epoxy hda dau hat cao su da duac thuc hien thanh cdng.
Tit nhiing kit qua nghien ciiu dinh lupng bang phuang phap chuan do hda hgc chi sd lot va ham lupng epoxy da nghien ciiu dugc anh hudng ciia nhiet dg phan irng, thdi gian phan iing, tdc dp khuay ttgn va thanh phin nguyen lieu (ham lugng H3O2) ciing nhu sir cd mat ciia dung mdi tdi phan img epoxy hda de tir dd budc dau lam chii dugc quy trinh tdng hpp nhya bio-epoxy vdi hi?u suat epoxy hda dat 46,68%.
Dilu kien tdi uu cho phan iing epoxy hda dau hat cao su la: dO^C vdi t i c do khuay ttdn 3000 vdng/phiit vdi ty le nguyen lieu: BD/H2O2/HCOOH = 1/2,5/0,5. Cf dilu kien phan ling nay nhya bio-epoxy thu dupe cd ham lugng epoxy dat 9,8% va ham lugng oxyran dat 3,65%
Da nhan tao tir he d i u thyc vgt epoxy hda (dau lanh epoxy hda va dau hgt cao su epoxy hda) che tao dupe dat va vugt cac chi tieu ky thugt theo tteu chuan da nhan tao vdi nhya nen polyeste khdng no va nhya nen sinh hpc.
Ldi cam on: Cong trinh ndy duoc ho trg b&i PTN Trpng diim Polyme & Compozit, Trudng Dgi hoc Bdch khoa Hd Ngi, Trung tdm nghien ciru vd phdt trien (R&D center) ciia cong ty co phdn Vicostone vd sinh vien Dinh Bd Ky K54.
Tai lieu tham khao
[I] Tayde Saurabh, Pamailfc M , Bhagt S.L., Renge V C, Epoxidation of Vegetable Oils- A Review. Intemational Journal of Advanced Engineering Technology, IV(IV) (2011)491-501.
[2] Marshal Patil, Jyotsna Waghmare, Catalyst for epoxidation of Oils- A Review, Discovery, 3(7) (2013) 10-14.
[3] Bashar Mudhaffe Abdullah and Jumat Salimon, Epoxidation of Vegetable Oils and Fatty Acids:
Catalyst. Methods and Advantages, Journal of Applied Sciences, 10(15) (2010) 1545-1553,
[4] Padmasiri K Gamage, Micheal O' Brien and Laleen Karunanayake, Epoxydation of Some Vegetable Oils and Their hydrolysed Products with Peroxyformic Acid- Optimised to Industrial Scale, Joumal of National Science Foundation of Sri Lanka 37(4) (2009) 229-240.
[5] A I Aigbodion #, F E Okieimen, I O Bakare and C N Abbey, Epoxydation of Rubber Seed Od with Peiformic Acid, Joumal of the Rubber Research Institute of Sn Lanka, 84(2001)18-24.
[6] Srikanla Dinda, Anand V. Patwardhan, Vaibhav V.
Goud, Narayan C. Pradhan, Epoxidation of Cttonseed Oil by Aqueous Hydrogen Peroxide Catalysed by Liquid inorganic Acids, Bioresource Technology 99 (2008) 3737-3744.
