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Test Production of Anti- Corrosive Paint in Laboratory Scale

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Test Production of Anti- Corrosive Paint in Laboratory Scale HUM MM0800097 Ministry of Science and Technology Myanmar Scientific and Technological Research Department Metallurgy Research Department Test Production of Anti- Corrosive Paint in Laboratory Scale Daw Thein Thein Win - Scientist Daw Khin Aye Tint - Senior Scientist ( Polymer Research Department) And Daw Wai Min Than - Director (Report No. 1012 111 2003) Content No. Page 1. Introduction 1 2. Experimental 1 2.1 Source of raw materials 1 2.2 Anti-corrosive paints test - production processes 1 2.3 Cost estimation 2 3. Results and Discussion 2 4. Conclusion 3 5. Tables 4 6. Reference 9 1. Introduction Paint can be described as a pigment-liquid composition which is converted to an opaque solid film after application as a thin Icu/tex- . The pigment provides the colouring properties and the liquid suppli^ the stan (film) forming component. Some pigment such as red lead, red oxide, zinc chromate, metallic lead powder and metallic zinc , behave as active corrosion inhibitor. The last to be effective . must form metal to metal contact throughout the film and to the steel being protected. The combination of natural resin with drying oil to form oleoresinous varnish which can be used as a clear unpigmented varnish or as a medium into which pigment is mixed to form paint. In applying the oleoresinous paints media, always used with a solvents such as turpentine to become thinning. In paint manufacturing. two kinds of movements ; squee|ng and rubbing are required to give proper dispersion of a pigment in a vehicle. With some modern pigment satisfactory dispersion can be achieved by mixers with specially designed blade (e.g cowles impeller) rotating at '--• very high speeds. Very fine dispersion can be achieved by the use of heavy duty mixers (1). In these research , experiments were carried out to produce anti- corrosion paint base on the local raw material such as shellac . p" oil, turpentine and ethyl alcohol by applying with laboratory scale magnc 2. Experimental 2.1 Source of raw material In these research, shellac was used as natural resin and metallic zinc was used as corrosion inhibitor. Also , turpentine was applied as solvent. Pine oil and Unseed oil were used as drying oil according to the various oil length (i.e oil to resin ratio). Besides , anti-corrosive paints were tested by applying plasticifer (caster oil) and extender (Aluminium silicate). In this experimental works (7) numbers of processes were carried out. The composition of raw materials, oil to resin ratio and oil to pigment ratio were shown at Table (1) and (2). 2.2 Anti-corrosive paints test-production processes In these test production of anti-corr ^ive . (4) stages of processes were carried out. They are - (1) grinding the pigments (Zn and ZnO) (2) preparation of vehicle. Firstly . shellac were grinded into powder and they were mixed with ethyl alcohol. To get thorough mixing they were stirred and heated about - 2 - 55'C for one hr. .After mixing, drying oil and turpentine were added and they were mixed thoroughly. (3) mixing the pigment and vehicle. (4) dispersion the pigment in vehicle with and without heat at about 55 C during mixing. Anti-corrosive paint achieved from these experiments were applied by bursh on test panels which were cleaned and pretrestsA . ihe properties of liquid paints and dried film such as viscosity , drying time , water resistance , corrosion resistance in manure and in water were tested and they are represented at Table (3) and (4\ 2.3 Cost estimation Cost iestimation of anti-corrosive paints based on volume (— 4 gallon) were calculated with current prize. And they are shown in Table (5). 3. Results and Discussion The chemicals applied in these experiments were not according to formular in liturature and almost of them which could be achieved locally were appliced (e.g. Ethyl alcohol was used instead of Benzyl alcohol). Then, laboratory magnetic stirrer was used in mixing the pigments and vehicle for a long times. Therefore, anti-cborosivc pai«is achieved from these experiments were not homogenous and did not to give satisfactory dispersion. So to get the homogenous, satisfactory dispersion and economically triple press roller, special impeller with very high speeds should be applied. Commercial oil paints can be mixed with turpentine to become thinning when it is going to apply. But all of anti-corrosive paints from these experiments can be only mixed with turpentine when processing the paints. When studying the anti-corrosive paints which were made by seven-procedures, will be seen that - (1) The surface which was coated by anti-corrosive paint that applied the double amount of shellac (procedure NO-2) gave high rigidity. (2) The more amounts of drying oil were used. the longer times for drying were necessaried. - 3 - (3) When the properties of anti-corrosive paint were compared^ the viscosity of paints from procedure No.(l to 6) were of no significant difference (16-18.8 sec). But that from procedure No.(7) [ with extender - Aluminium silicate ] has the highest viscosity (35.9 sec). (4) The drying time of paint from procedure No.(l) has the shortest (-hr) and that of paint from procedure No.(7) has the largest (120 hrs). (5) When the property of ease of application with bursh was axrvpared, the paint from procedure No. (3) was easiest and that frorn -ioce^...v i\fo.(7) was most difficult. (6) When testing the qualities of anti-corrosive paint , the paint from procedure No.(3) has good properties of liquid paint (i.e, viscosity 16.9 sec, drying time 3 hr and ease of application). Also the paint from procedure No.(3) has good properties of dried film (i.e, water resistance , corrosion resistance in water at room temperature and at 50 C , corrosion resistance in manure at room temperature). Besides , the cost for paint from procedure No.(3) was not very high and therefore it can be decided as the best anti-corrosive paint. 4. Conclusion To get homegenous satisfactory dispersion and economically , triple press roller, special blade impeller with very high speeds should be applied. When testing the resistances of anti-corrosiv<* paint ( properties of liquid paint and dried film) the paint from procedur No.,(#> has good properties and it can also be seen that it was not very high in cost. Therefore , paint from procedure No.)3 is the best anti-corrosive paint. Tables Table (I") Composition of raw materials for anti-corrosive paints ; (o) Raw Material Oil nil Shellac Oil Pigment Extt ir to to Process Ethyl Turpentine pigment No. Pine Linseed Castor Zn ZnO Aluminium Resin Alcohol oil oil oil Silicate Ratio Ratio (gm) (ml) (ml) (ml) (ml) (ml) (gm) (gm) (gm) l.(N) 28.8 264 24 24 - - 35.2 104 - 0.83:1 0.17:1 2.(S) 57.6 264 24 24 - - 35.2 104 - 0.42:1 -0.17:1 3. (P2) 28.8 264 24 57.6 - - 35.2 104 - 2:1 0.17t I 4(Pr) 28.8 264 24 144 - - . 35.2 104 - 5:1 1.03:1 5. (N-L,) 28.8 264 24 24 24 - 35.2 104 - 1:7:1 0.34:1 6. (N-U) 28.8 264 24 115.2 172.8 - 35.2 104 - 8:1 1.7:1 7.(E) 28.8 264 24 24 160.8 12 35.2 104 25 10:1 2.1:1 Table (2) Preparation of anti-corrosive paint OOOQ:: (J) Process Cold mixing time Hot mixing time (55 *C) Final Volume No. (hr) (miri) (ml) l.(N) 26 25 200 2. (S) 25 15 200 3.(P2) 26 60 200 4. (P5) 27 60 225 : 5.(N-^ ^ 24 25 200 6.(N-L2) 27 15 250 . 7. (E) 28 15 400 -6 Table (3) Properties of liquid paint C C C C ©coo: :x?OQQao::3&6|pogH qcBD Properties Process . Viscosity Drying time Ease of application No. (sec) (hr) with bursh l.(N) 17 Vi good 2. (S) 16.9 10 good 3. (P2) 16.5 3 good 4. (P<) 16 168 good 5.(N-L0 17.5 15 Not good 6. (N-U) 18.8 28 Not good 7.(E) 35.9 120 Not good - 7 - Table (4) Properties of Drkd film ©ox>: pjoffi Properties Process Corrosion Corrosion Coirosion Water No. Resistance in Resistance in Resistance in Water at room Water a( Manure at Resistance temps. fa ' c room temps. © l.(N) good fail1 fair good 2.(S) Not good Not good Not good Not good 3. (Pi) good good good good 4.(P3) fair fair Not good Not good 5. (N-L,) good good good good 6. (N-Lj) good Not good Not good Not good 7.(E) Not good Not good Not good Not good - 8 - Table (5) Cost estimation of anti-corrosive paints based on volume ( V* gal) ©coo: -| 0I0S3&G0T Process No. Cost (Kyat) l.(N) 1942 1 1 2.(S) 2357.80 3.(P2) 2212 4.(P5) 2926.36 5.(N-L!) 2269.31 6.(N-L2) 3741.36 7.(E) 3077.76 introduction to paint Technology. The science of surface coating. Concise paint Technology. Gxade to pigflveflts m& t0 van»ish and lacquer constitutents. Pamt and oil sa& colour journal. July 21, 1950. The Chemical ftnwdary , Vol: (V) 6- Encyclopedia of Chemical Technology , Vol: 24. Encyclopedia of Chemical Technology , Vol: 16. Chemical synonyuvs and Trade names. l0. Corrosion Science tt.No. 6 : 505 - 25 ' 78. u. CWHMB,V<i:31-to5 May 1975. n American stafl&rd testing Method (ASTM part 4). l3# British standarf Mlution (BSI). 14. 'tosgy &om Bionuss in Europe. l5< Twls from Biosnass. tg Hmd bodt of Bionass conversion Technology..
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