Guruviah, S.

Rajagopalan, K.S.

Sundaram, M.

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f}OVAT'rJtTl9nt of India, 1'he PAtent Vf'f!ce, 214 AehRr,.aJ'~Bod~I.CJhBoae Road, CalcuttB- 700017 ... Complete~[1er , t'le a ti on No • 1175EJO drJted 31 th Jf f} nl1&ry 1978.Appli'~B tiOD No. 85/Del/78 dO te~ 31t') J!3nlJsry 1978.ACcApt8nce of tha Complete Specification odvartiseriIndex at nr~eDta"C9- 10~ LXLV(l)][ntArnatiol'1"l C18~slricntinn- C::>'~f HI/')/)';()'Id S/.10; f,/t:?" PRu.,;Rr;s POR 'rHI~FH,,;Pl\ !F\ r ION Or;. t-'OVEL Z T1'IC -90DrtHfCouncil of Scientific and Industrlnl HeS~ArchRnti l~r5l;, NewD"!lhl- 1, India ..An Indton H~~lstered body lncorpornteo under theHe~.fqtJ·otlon of Societi~~ Act. Act JlX.l of 1860.'P.hero] lowlnflde!1crib'9s 'Inninventjon anriperfortfled.~peciflcatlon particularly09certntns th1 n~ture of thi~tll'l manner in which it is to boPRICE. '1s 2,00Tlt~llI i. an i.nventjon by K:unnn!l.t.ti th.i.dR.l Santl"unanl RA.JAG'jVALAll,qU~I~+"'" ,tdar GlJn1JV1"q ~n"" roflpj'yRppa SUNDARAM, :'·'fll!nr,tf't.~, 1111 ofLn;;"~~'11J:'l;· ..l El"!lo\.rol.'l'.-rni"ll1 Res.,arch IT1ttltl1te, 'K •• raik.udl-6~5 ~06.lndia, -<1.1 Indian CttizfK3A."lTOII.II1nwn t10n relatl"!l1 to a. proc"liIl1 for the pr~l-"6t'&t.ioD oflloo-.:>,:ilum 11:\I i~a\' .. pdm-r "for pI1)terotioh ot IIt!"!!l stru.ctur"'s •.At preaent it 18 a OOIAmon practice, l;Q u~e r"!d orl..de/zin<'obra:tat fI pr.im~ l' and red ler..d primer for the protection 01 "tel'll.truCl.trtlll eX~l')lIed 1D atmoaphf}re.~I~hell.primerll I\.re not intended to give proteotion by them-.. 1........ th88" have to b~ followed b;v f 1Dishing paints.r leI main object (\f this 1nven tion i. to p~pn.r.e a novel pl'W ~rfor oorro.lo'.1 protection by barrier effect and ell!!otIY'chem1r.~al.etboo. ').Ibe ooa ting ohtained i8 hard and abrasion reaietant.'J he main findlng IJf the i nven tlon 1. that whe n zino dUAt1- iI,c o.rporat ed 1n IIOdl\.D sU1ca ...e .01utiD n along with red lead-(and. JK,tall81um 811100 fluo~de a DOvel protective primer 111.Qbta.l'Jed. .I.'lee prim"!r can be appl ied 00 to metaJ.. surfaoe evenunder wet cor"U tiona. Lhe hard and abrallion reaistant coatiPBto:nu i OD th~ wrface oan be •• 11y removed by ac1c.tc wash.rhe 00& ti~ which drlfea quickly :fomlil a ha.rd .\ JJ.'&.sionl"•• lltant oow,t1ng. It can be applied in 00"1114atmospheres andOD "'e t aurfa':Jes.Furthermore, the pr.1mer too. prepar~ gives both barrierpro ~ctioD and (:uthod 1D proteot 100 to the baae metal. 'J.'heprimerwb1l]h can b" applied under humid conditione or on wet aurfaoes81v11I a thick, hard abrasion resistant coating. 'lIbe per.l.od of,rot eotion otfer ed by the primer is more than that of' conventionalprlller J.n 0 'JlDbination wl th f lniahlDg paint ••'J:he 1nll'ent10n, thus provides a process tor the prepa.r6ttionot t" DOyel pr:imer for ateel structureB, compriaes rea.otif~ zioc4UH1i in an aqueous IIOdium silica.te solution, with red lead andpo w,ilsium 1Iil1l1co-fluorlde a nd stirring the reliction product with.. t!r to olJtaln a broBhable con.iatency.• Jlurthe1'lllOre, the reaction produot obtained iRay ooutain 70-90,,"l'UJ'. sino dulrt ot particle size of 300 mesh aw 5-25~ of the8Od1~ a1l1cate IiIOlution and may conto.1n 1.1 to 1.2.2 to 3.5 pafrtlil01' N~O I 3102. '.i'he reactiol1 miXture may contain trom 1-4~B~I lead and 1-5~ of Pota8sium lIillco-~luor1de.~''''11e :,rifl;~l l,t"'"",dllr;t nbt.a~Ul!'!d "y this procesR 19 P t'!1'J'i'.ttngc~" l,l I": /, t"i.tuiJIH tQ '\P';' I"~~llt pro'H).at ii, UQl" 10100 iA not a""e:~ ·....'lItl.!;:'Jl.l .... r;:' L-,.-·r ...IiJ,.(I~,s. Th~ invellt.i..lll" ilifllrtht'r 1l1UR-t; r: r.p'! by t LI!! f., .l.lnw i 111· ~XamT'1 p".EXAMPLE 1~II t.:m of Sl1<J!u.m,.. i', i··lil.r.~ (r,la2o ! :Ji02 :-.:1:?1-3.5)arr d1f:s.,lv~.j in '},) mt e,1 ""A.t ..~r. '.I'" t:1J.a ~:r. l.J11 of red: f'!l" _~ i'tl ~ a 'ld ~r1 lil.nd:h to j r r ....; we-II. 7. I Ie dUH t (3OC) mesh)4~1. fm ttY'e ~J:l'l~d 10 tlliR 'wl:JL~"1l ~! ,1 ,:.1tilT~a 10~ 3'1 rl,inut~Sl.If II~ ('flSi'l1 I ry. f po", )'T1'i r) f wut~r "r P :ill ,...d tl' g~t a brlll,llla~ J f!'("01 "l.stera,.:).'~XAJvIPLE 250 @l of 1i1"(\ iu'Tl p Uj (:6. t, (Na~/l :.:..a02 -::: 1:2. J - ~,.5)arf~ dJ.8l'll'lve.l in )'~ I~,C ~f '''''ltf'![ and to thls 1l,H'e addl"'d20 .~ of red 1"1-<0, :' POI of pr·!..asE'ium liilJc()-flllO~ide,45(1 {4fl of zil1l" d\~nL .. tirr~d h!"ll for )U r.linute,'.:arlud1llble conelst.eley is obtnio",:, by uddirlg r"w ml ofwat~r.400 f1IJ of ziQC dust al'e added to a s('lutinn C'ontaiulrlF,160 f§I1 of liodium silicate (Na~Os:H02 = 1:2.1-3.5) and r"dlea i 20 grn.The primer thus I.r~I19red C':.Ul be arplied on pickledaurr.",ce. .l'hls oun be applied oV','r wet su.rfaces alao.It iJaa been obaerved urlder im.LJcrsed GI)uditionEO il" J.l.still(!dwat.~r and 3" NaCl at room t emlJera. ture that there is nobrown rust fo.nr:Jation alol'lb the ecral~chef.::l and othez' al'('!aG.It ~.ive&l sufficient negativE.' potential in 3:.' l~aCl underimm~ r61l"d cordi tion. 1;he protecti on offl'lred by t"his primerhas beell found to be superior to other con\fcn Lional i'l'illler':iat Mandapam Cemp amosphere during iI,s one year exposure-.The protection offered i;.: further enhanced by applic: ...tion offin Lshln{l, paint. No rust.ing waR noticed even Q t the end of12 :ilIonths.r~"'foma(> !e of prim~r paj nta at the end. of12 nonthB at; MandapliIIl Canql.- - -'- ... - _. - - - - - - _ M. ,-• U:eri tSI.Mo. Ne nle of [ t"'imer values'for 100.... - - . - - ., ~ - - - - ..1 _ Red. o i.de zlr'J chroma·t8 30Red had red oxide 403 .. S111Cl •. 1lie priDler 70..... _ ... '.. .-- ..... --_ ... _-V; ;"'1~A.:~ ~\e surface was almostcovered wj th ru r;tHusti0'3 fle~ly ul ovt'tl'White corrOSil)[) prdduc tp.ll over. Red brownrusting along the edeeAand at few places here'and tl'fl!re .WE! el'aimt _.I. F roceS8 for the preparat ion o~· :.1 nO'J ~l primer forlilteel str.ucturl"!s (hEprisin~ reQ.cting zinc dust in ani1ueous sodium. 8.1.11oate solution, with .red lead and1;yta,ssi l:n s11 lCU--n uohrle and fiiltirring the reaot ioni I'oduct with watl~r 1D obtain a brushable consistency_,2. 1 I'OQess aH \31aimed in claim 1 wherein ~ 7<""-':10%of. tno dUEt of particle size 3 ,0 IDeoh is added to 5-25., F aqueoulJ sodium sUicat e iIOlutio n haYiog Ii. Na20 &8i02'atl0 0:' 112.2 to 3.5 parts and admixed with 1-4~ ofVoed lead and 1-5~ of llota.as.lum silic.o fluo;1de.Da"~edtbe 25th dII¥ ot January, 1978.l~.k.. --- ....----(I.M .S. M.AMAK)SCIENTI~T '.' (PATBNR8)C.8.1.R.

Process for the preparation of novel-zinc sodium silicate primer for protection of steel structures

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