LÝ THUYẾT TỔNG QUAN VỂ SƠN NƯỚC

8/3/2019 L THUYT TNG QUAN V SN NC

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2/18

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


3/18

1.2 Phn loi

Sn ni tht

Sn ngoi tht

Sn lt chng kim

Sn chng thm

Sn bng trong sut


4/18

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


5/18

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


7/18

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


8/18

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


9/18

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


10/18

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


11/18

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


12/18

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.


13/18

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


14/18

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.


15/18

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".


16/18

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.


17/18

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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LÝ THUYẾT TỔNG QUAN VỂ SƠN NƯỚC