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8/3/2019 L THUYT TNG QUAN V SN NC
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8/3/2019 L THUYT TNG QUAN V SN NC
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1.1 nh ngha sn nc
Sn nc l mt h thng ng nht bao gmcht to mng, bt mu, dung mi v mt s
ph gia khc. Trong , cht to mng lnhng nh tng nha phn tn trong nc
u th : khng gy nhim, gim thiu lngVOC
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1.2 Phn loi
Sn ni tht
Sn ngoi tht
Sn lt chng kim
Sn chng thm
Sn bng trong sut
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1.3 Thnh phn sn
Cht to mng : ng vai tr quyt nh tnhcht cl ca mng sn
Bt mu : l cht to mu, c 1 t tnh cht tng
cng cl Cht n : lm gim gi thnh SP, c tc dng
tng cng ca mng sn
Ph gia
Nc
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1.1 Cht to mng : l dung dich nh tng cacc polyme trong nc, s to thnh mng snkhi kh.
Trong nh tng, cc si polymer tp trung lithnh tng nhm to thnh cc ht cu llngtrong nc
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1.2 Cch ca qu trnh to mng : chia lm 2
dng Qu trnh to mng khng chuyn ha : s to
mng han thnh hon ton do qu trnh bayhi ca dung mi
Qu trnh to mng c chuyn ha : s tomng ngoi vic bay hi ca dung mi con cphn ng khu mng gia cc chui polymer
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Theo quan im hin nay, qu trnh to mnggm 4 G :
Cc hp phn sn c gin tri, phn bu
trn b mt cn sn Nc bay hi, cc ht nha tin vo gn nhau
Cc ht nha tran vo nhau to thnh mng
sn Nc v cc hp phn khc tip tc bay hoi, cc
si nha l/k vi nhau to thnh mng sn
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1.3 Cc cht to mng thng dng:
Copolymer : vinylacetate, copolymeacrylic :s/d cho sn ni tht
Steren Acrylic : Sn ni tht, sn lt chng kim
Hn hp Acrylic nguyn cht : sn ngoi tht
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Trong sn nc, thng s dng mt s cc phgia sau :+ Cht lm c+ Cht phn tn Cht thm t
+ Ph gia chm kh+ Cht ph bt+ Bt mu
+ Cht n+ Cht dit khun+ Cht dit nm mc+ Cht h trto mng
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1.Cht lm c : c tc dng iu khin nht,tng khnng bm dnh. C 3 nhm cht lmc thng dng :
Celulose HEC : lm c bng cch trng n PU : lm c bng qu trnh kt mng phn tn
Polyacrylate : kt hp 2 khnng trn, yu cupH mi trng : pH>8
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2.Cht phn tn cht thm t
2.1. Cht thm t
L cht hot ng b mt
Khng phn cc
i vo dd lm gim sc cng b mt, tng Pphn b gip qu trnh thm t cc ht mudin ra nhanh hn lm tng tc phn tn ccht mu
A/h n bng, khuynh hng to bt, tnhn mu, n nh vi cc pigment
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2.2 Ph gia phn tn
Cc cht phn tn thng l cc cht phn cc
m : anionic Ph gia phn tn hp th ln b mt ht mu v
do duy tr khong cch thch hp gia cc
ht mu thng qua l
c
y tnh i
n ho
c nngkhng gian, do lm gim xu hng keo
t khng khng chc.
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2.3 Ph gia chm kh
Khi trong dung dch sn cc cht ny to lplin kt hydro vi cc phn t nc trong sndo lm cho cc phn t dung mi nc bayra ngoi chm.
Cht lm kh thng gp thng gp :Propylen Glycol
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2.4 Ph gia ph bt
Cht kh bt c tc dng tng sc cng b mtca bt kh nn lm cho bt kh d v. Trongdung dch n c tc dng tp hp nhng btkh nh thnh bt kh ln ri ni ln trn b mt
sn, khi bt kh ni ln trn b mt do cc lctc dng nn n mt cn bng vra.
C hai loi cht kh bt:
Minerl oil ( cht ph bt gc du khong, Wax,Soap metalic )
Silicone bao gm hai loi: Silicon thun vSilica Hydrophobic.
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2.5 Bt mu : Bt mu c 2 loi c s dng trongcng nghip sn l: bt mu v c v bt mu hu
c Bt mu hu c
+ u im ca bt mu hu c l mu sc ti, sng,
cng ln mu cao, ph tt. V vy, ch sdng 1 lng nh bt mu cng mu cho sn vbt mu hu c ch yu s dng cho sn ph
+ Nhc im : gi thnh bt mu hu c t, bn
nhit km, d phn hy khi nhit cao, dn nhin tng loang mu sn, hay cn gi l hintng "sn bay".
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Bt mu v c:
+ Bt mu v c c s dng rt nhiu trong sn dogi thnh thp, bn c, bn nhit cao. Bt muv c l cc hp cht v c c mu
+Nhc im ln nht ca bt mu v c l ln
mu, ph km, mu xn,... V vy, phi dngnhiu lng bt mu.
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2.6 Cht n
+ Bt n lacac cht dang bt min, mau trnghoc mau rt nhat, chi skhuc xa thp (khoang 1, 4- 1, 7) phn tan tt trong h thngsn.
+ Bt n c a vao giam giathanh sanphm, ng thi lam tngtinh nng kythutcua sn(tao phu gia), nng cao bn cualp phu sn ( cng, bn nhit, bn khi
quyn.).2.7 Cht bo qun dit khun
2.8 Cht dit nm mc
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2.9 Cht h trto mng
+ Quatrinh tao mang sn din ra nh s lin kttao mang cua dung dich nha va stao mangnay lai xay ra chm va chixay ramt khoangnhit nht inh, vmi loai nha cogii
han tao mang khac nhau+ khc phc : cht h trtao mang nh:
Texanol, Netcoat NX
2.10 Cht iu chnh pH
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