DE2547363A1 - RELEASE COATING FOR GLASS MANUFACTURING - Google Patents

Description

1 BERLIN 33 8 MUNICH 80

Auguste-Viktoria-StraBe65 _ ηιιοΛυΐ / Ε Λ DADTMCD Pienzenauerstraße2

Pat. Dr. Ing.Ruschke UT. ΚϋΟΟΠΝΠ CSt KAKI INtK Pat.-Anw. Dipl.-Ing.

PATENT ^{LAWYERS Han8E}

^ ₀₃

Telephone: 030/11 ||| f _t BERLIN -MÖNCHEN ^{Phone: 089} '98 72

Telegram address; Telegram address:

Quadrature Berlin Quadrature Munich

TELEX: 183786 -> --./ J I. TELEX: 522767

[ranked

b 1109

ball brothers Research Corporation, Boulder Industrial Park, Boulder, Colorado,

Ver. St. v. Aiuerika

Separating coating line for glass production

The present invention relates to compositions of materials and methods for their application. In particular, it relates to compositions of fabrics useful as mold release agents for protection and lubricating the surfaces of molds and other parts for the shaping of objects, and particularly for shaping and handling of glass objects and the like at high temperatures.

In glass manufacture, a molten glass sphere is formed into a parison with a blank shape with a portion corresponding to the neck of the desired glass object. It is necessary that the mold surface of the blank shape not be worn away or fissured so that the molten glass easily flows over the mold surface, assumes its shape and then can be separated from it. It is known that the power delivered to a glass forming machine sphere of molten glass (1600 ⁰ F) has a surface temperature of about 87O ° C to 93O ⁰ C (170O ⁰ F). During the

609819/1282

Formens cools the molten glass to a temperature between, about 680 C (125U ⁰ F) and 73U ⁰ C (135O ⁰ I '). As can be seen, this cooling process makes the glass less plastic and often creates a drag on the surfaces to be formed.

In the past, we have used various methods to address the problem of Shaping glass objects used to protect and lubricate molds close. Typically there are various means of doing this in the forms which contained a graphite compound or the like in a carrier. Hydrocarbons such as kerosene were also often used. In general, these agents are sprayed on, painted on or during the molding process dabbed on to make the interacting molded parts slidable and a to prevent the molten glass from sticking to the mold surfaces. However, such agents are disadvantageous in that they contain hydrocarbons, and the methods of using them are also disadvantageous. Since the glass molds are at very high temperatures, the hydrocarbons evaporate a lot quickly into the atmosphere. Aside from unpleasant smells, the evaporated materials also generate significant amounts of smoke, which can affect the range of vision and condense into deposits that are sources of fire hazard and become increasingly dangerous as the accumulation of deposited matter increases. Furthermore, the agent must be on different parts of the machine are regularly applied during production, which often leads to injuries to operating personnel. These drawbacks have forced the industry to to apply other solutions to avoid the undesirable conditions.

A number of aqueous systems have also been used with varying degrees of success used. Various mixtures and agents with inorganic binders have been used for the protective coating of molds in which water serves as a carrier substance. Exemplary of aqueous agents with an inorganic

609810/1261

African binder is a _aas} is composed of an inert refractory material such as clay, Iiuii una a soluble silicate.

After thorough investigation, compositions of substances are found which has been considered advantageous over those of the state of Teclmik in several be kept watchful - especially with regard to their ability to act as Lubricants and release agents in a wide range of industrial applications to be able to deliver excellent results.

Accordingly, it is an aspect of the present invention to provide effective compositions of substances _; which are suitable for coating molds for casting or molding materials at high temperature without releasing organic contaminants into the atmosphere.

Another aspect of the present invention relates to a separating and sliding system the periodic wetting or treatment of surfaces that come into contact with hot glass objects to an extreme minimum reduced.

In accordance with another aspect of the present invention there is an improved one Separation and sliding system indicated that the need for a conventional treatment of the surfaces coming into contact with hot glass objects minimized.

According to a further aspect of the present invention, a separation and Sliding system for glass forms specified, aas easy to use outside des and can be used before the actual manufacturing process.

Another aspect of the present invention relates to a system for sliding

6 09819/12 6?

_4_ i. J H / OUO

lc.i.ij.i: -aci.eii von BlasLonnen, the products of excellent quality leads.

These and aiwerc aspects and ideas of the present brief shall now be discussed in the iol ^ cndcn teschreibunj_. explained.

isach to the present; Lriinuuni, let themselves overHacnen, uie in contact kur.j.-en i.it I.cii.'ien ^ lastiscl.cn Ströiiir.7-. _c .5iieu: kr. v.ie ^ cyclical zeneii: glass n.it ejj.tr Zu.suj.j.'cnietzuj ·. ^ ,, conductive i.'iacr.cr., di (. a u; iai _c e Lisx- ersion a. -J sc'.um. Cj lies .testen oluitr: .ittcls _; cir.es ».asscrlüslichcn bilikatbindei.- itteis, one iil.binucii-ittclu ui: u eint :; v -.« Ii.:->erloslici: en ι i.oh.!. «: ti« ..ar ^ tellt ...eiteri; in L.etrii: t tiii vcrlit ^ ciioc Lixii.uun ^ a Vcriai.iei. rL-r! .ilcun ^ eiiK- s ulcitiind Yitrüii L.er, iL;, s aUi an i / ucrJ lcche, aie i..it ncii ^ .i; Lli.s ^ c ^ enstCfnueri Lei w_u · ;. ii; rti _v uit,., in LCiUiTUn ₄ .. kc-i: Ji: t. Indc-i ..! - .. an cjne v.auii ^ .ei) is _x ersion of a ..L-ciu: ,, .. cii.ci "icsten üleit: ..itteJs _; a v.asserlüslicjicn silicate {.- iciticüitteis _} eiiicu /ibbindeii.mittels ('scttin _t i. _c .cnf j and an Ayasserluslicl'ei: i: Oi ₁ nuts üiii which 2U Ltscniciitoi.ut üLciilaci.e applies and; ater UUS ucr Lisi-ersion ontiernt, inn the coating aui to fixici'en the Cberiliich-e uer iDVR i-cnutzte Ausüruck ¹ LiS _x -CrSiOn ¹ to .attun ^ ^ s ^ euiuß also to ^. ezeici »i'UT: _o of ^ uS ₁ ens ionen, solutions unu.: ischur.i.en uicnen.

Lei den = iestci; Lleiü. it can be some Luis dance in a ^ roLcn l ^; axiiilie aiior ^ anischer Koiu _x : onenteii nanueln, üic unter iioi-er. Tcittj.craturen are permanent. Aeis ^ leHiaft ieste cleiti.mittel siTid graphite, ixiiTiitrid, LilixitaraitTia so ^ vie ^ clixai.idisuliid. Lei deni graphite can be Uü. ir ^ naeine uer differentei; Particle Shapes] jandelü - uie LS | * '. n <xrken, elektrolytisclicr and colloidal ürajJiit or herkönaüliclier braj.hitj v.as he is known to the Faci: u-elt. The natural as well as the artificial unysfoiTiieii of graphite can be used for the present invention

COPY ÖAD

ziiiiiciienst;:.! Ic-nu inserted ut-iucu. '..iii.rcm: üie Tcilchciu-ruTe ucs ür :: i-iätj> is not i-.ri table ,. : .- irci toilets from K- i'ix 2L \ - .uirni.cirfür, i: r.ci those from v.er.h.or iii.s 7:>, u .. i-.CK.en iLL ^- -i .. _k .si.etso cin ^ c.-ctzt. Lic .vitr'uie um; or unu oii.ir.iiuu siiui sci.r ^ ut;., Eei _c nete ieste blcLtrittei, ues _ ,. I. steep «ve,

i \ üiiibiri: -: tLcnen von i.ornLtrk: unci Lm ^ hit preferred ülcitu.iltd dar. in. allgai.eii: cr. Lie ^ .t üic 'lcilcl-.en ^ rölie iLr ciese iXitrioe ri.isehen about C;, 5 l; i; ü, uri. Aucu i.oJIiiünüisulliti liuut sLci, insert! · _S i'.escnceri »u. Ü-inzertc-ilten lubUiiiia, uiiu iii. LiI _4- OiKCinen is a particle size of v ₄ cni _ft er than 2, U / Uti. What is to be described here lusaiiü.ciisctzunLon very well suited, ou. _{Ien t} .enmiteil of the i..leitii.mittel, oer i'ur what is to be described here .'- iittcl can be displayed in; i range from about 5 to 70 GeK.- ?. the v> ai ^; ri _o eri allst si on were running.

! .de in üen; The water-soluble silicates used according to the present invention are all bilicate of inorganic bases; Organic bilicates can also be used successfully - for example guanidine silicate, tetrahydrofuran. - and tetraethanolananoriiuinsilicate. The preferred bilicate is isutriunosilicate, which is easily available from industrial sources - bsv: w. Waläri .Natriums ilikat with molar ratios of organic to I \ a ₉ ü from 1: 1 up to 3.9:. 1 in the case of isatriuiimietasilikat übgleich Uie in the compositions according to ücr i-.rfindunj, Silikatmeri ^ e can significantly barriers aufgenonniiene, the preferred range is limited to about 10 to 40 wt.

LS has been found to be essential, the water-soluble one described here To add a setting agent to the silicate. In general as used herein, the term 'setting agent' refers to the star Additions that considerably improve the usability of the coating agent.

609819/1 262

COPY ^BaD ORIGINAL

sern. Although the binding means appear to work as harder for the silicate, they evidently also have a control function and allow that in the Kasser or water of crystallization containing silicates !; 'dry on the surface the coating can escape. Apparently the setting agents also bind present water instantly; so that. on the surface, no Dan pistol or blisters appear. In this perspective reference is made to / that the liier the setting described above, the effect of the silicate according to the present Improve operation, although more precise functional Let properties only hypothesize. The in. The present br-. The setting agents used in the process are, for example, zinc oxide, calcium chloride, magnesium sulfate, Aluminum sulphate, sodium eiborate, sodium roetaborate and sodium fluorosilicate, kaolinitic clays and minerals and their mixtures. ■

Has in the composition described here. it turned out to be necessary

to,

sen to add a phosphate component compound, the phosphate being water-soluble and is neutral or alkaline in aqueous solution. After drying apparently improves the phosphate components without any adhesive and holding properties of the silicate binder on a given surface. That preferred The phosphate used is tribasic ixaliuffiphosphate, - - -.

In carrying out aes method according to the present invention it is iiu It is generally desirable to have the surfaces of the glass-forming system parts beforehand to clean to remove all impurities such as metal oxides, loose particles, To remove oil, dirt and the like and thus better adhesion and service life to ensure the coatings.

In the treatment of molds and molded parts, including blank molds and the like. By the means disclosed herein, coating and the like the following drying of the agents can be accomplished in a simple and direct manner.

003813/126?

gen. The treatment of lOrfccn Forniteile and is simple so that applying the herein described ivüßri-e dispersion and evaporate V.asser lülit barren by Lrivärmen removed. The water contained in the aqueous dispersion can be removed for this purpose in a large number of different ways; sufficient removal of the water is achieved by using the compositions described here. read 1 hour Temperatures between about 15 ° C (300 ° I ^; ) and 2Ou ⁰ C. (4CÜ ^U J?). The dispersions according to the present invention can be applied to surfaces that later come into contact with the hot, plastic glass. Apply any normal or traditional method - for example, by painting, spraying, lint dipping or inflating. Preferably you vdrd them on; rest.

I \ ach de «, learning the essentials from the t-dscliun ^ form the separating and lubricating agents, a coating that adheres firmly in a thin even layer to the Surface adheres »The layer thickness can vary considerably, of course depending on the applied men ^ e - and lie ^ t irc range of 13 µm and 0.127 nan. The coating itself is thermally stable, has one Good oxidation resistance and em.o ^ light a good transition through ^. iv further are the agents discussed here very virl <saip for the production of glass ^ Items of excellent quality.

d the heating step to client, the water or other volatile Driving out constituents, it also binds and stabilizes the bilicate solid lubricant in the ion of particles distributed on the surface - ndt the result that there is a firmly adhering coating. As a result of the fixed He is the liability and durability of the coating obtained in this way firmly bound to the surfaces - this in contrast to many superficial ones Prior art mold coatings and compositions.

..6OaS 19/126?

copy

It has often been found that wetting agents can also be added to the aforementioned compositions. Wetting agents can be used to facilitate the dispersion of the solid lubricants and to stabilize the resulting dispersion. A wide variety of wetting agents are available, and any of the conventional wetting agents can be used with the present invention.

In addition, one can also use thixotropic agents and the like to achieve the desired flowability. The preferred thixotropic agent is sodium dibentonite. A filler such as silica can also be used.

The results obtained using the said compositions show that the usual service life in conventional machines is several times longer than the service life of other coatings. The means disclosed and claimed here at the same time result in considerable savings in time and costs, since it is now possible to produce glass shapes and sizes -treatment devices to operate much longer and the need to mold and other part of such equipment dealing with hot glass objects come into contact, handle by hand, avoid.

Although the disclosed composition and method are particularly suitable for glass forming machines and their parts, it is understood that such compositions and methods are useful for other shapes and the like that require release agents and lubricants. The composition described here can also be used in metal forming technology, e.g. for zinc, Use aluminum and its alloys.

The invention will now be explained further with the aid of the following examples.

19/1262

Example I.

liine aqueous dispersion of 31 _; 8% by weight of sodium silicate, 25.4% by weight of graphite, 1.4% by weight of sodium bentonite, 5.6% by weight. tri-baseschcni Kaliumphosj-hat,

5.1 weight ^? 6 zinc oxide, 0.43 wt. - ο sodium alkyl sulfate and 3C, 1 wt. Graphite! "Lure, 0.15 kg (0.33 lb.)" Natriuiiibentor.it,. 0.59 kg (1.3 lb.) trilasic potassium phosphate, 0.545 λ ".. (1.2 lb.) zinc oxide. 0.045 kg (0.1 lbs.) Of sodium alkyl sulfate with 3.133 k ^ (6.9 lbs.) Kasser prepared with continuous stirring for 30 hours in a conventional ball oil.

The v.äiiri ^ e dispersion v.urae r «; with a spray gun leici-.t on a cleanly prepared. i>. metal surface of a blank shape sprayed on, the specified shape then 30 ί · απ. in an oven Lei 177 C (35O ⁰ F) reserved; the treated 1-oriVi had a coating of 29.7% by weight of catriuric silicate, 47.6% by weight of graphite, 2.68% by weight of sodium bentonite, 10.56% by weight of potassium uniphosphate and 9% by weight , 50% by weight zinc oxide. The dried coating thickness was about 51 / µm (2 mils).

The raw material treated in this way was used without wetting to divide Bottles used, worked satisfactorily, and was in continuous use for about 20 hours.

Example II

Line aqueous dispersion of 27.4 wt. 5 sodium silicate, 21.9 Geu .-% lornitride,

1.2 weight ^? ui \ atrium beritonite, 4.8 wt .- 'tribasic potassium phosphate,

4.3 wt ^r i zinc oxide, C.20 4 part by weight iatriui.alkylsulfat I and 40.3 parts by weight t hasscr was prepared Indeni 2,1 B ^ k, (4, iv Ib ') i \ sodium silicate (52 ° uauihe), 1.73 k _o (3.8 Ib.) Bornitriu, 0.05 l & i (0.21 Ib.) Sodium bentonite, 0.377 Jk £,

609819/1262

COPY

(0.03 Ib.) UvcLiiibi.sci.es i-.aliui .. [. Hos _{i .l 1} £; t _> 0.318 l ^. (0.7 IL.) Zinc oxide, Ojü1 <i- k _t . (0.03 IL.). Mitriuualkylsulfat with cauemiuit cooling in a herktiUiiliclier. ia ^ cliuuhle etua 3ü Stci. lai, ^. ;, ät 3.17K k ;, (.7 Ib.) i-.asser mixed v.urüen. i-'ie v.üiirLj.e LUs ₁ CTSiOn v.iirüc · ήJt a L..ritzpistole easily υη'ϊ cine sau Lor trimmed ^ .etallchcrriöcho a Kohlin ^ sfoiT., on t, it |. scratches> üic i-'onu then 30 iiiii. ii »eipei :. Li.ci. !. reserved at 177 ⁰ C (35O ⁰ F). The Lehancieltc FoiTi, had one; ul.crzbi .; n.it 2ΰ, 8 GeIV .- '.- l iitriUi.silikat, 47, S wt -..% bra ^ hit. 2.6 oev.-.- 'il \ atriuiiiLeiitonit, 10.4 (Je \ v.- ^f _u Kaliuiui-hüspriat una 9.3 Geu.-i, Linkoxiü. Lic thickness ues ^ etruckriCtei. Tberzu ^ s was et \ va 51 /Ui.i (Z n.ilsj.

uie sü bchc.naeltc Rohlin ^ siciTu v.urue without wetting for the production of ver \\ encletj works ζuirieüen-sharing and found sicls etua 20 Stci. in through aeiii Lens insert.

III

Line aqueous solution init 23_, S i; evi .-% sodium silicate, 4.5 € e> /.-% boron nitride, 1.3j6 weight y graphite, 1.1 Ge \ v.- ^C o iNatriuiubentonit; 4. , 2% by weight tribasic potassium phosphate, 3.5% by weight zinc oxide, 0.4% by weight ^? o of sodium and 48.5 weight ⁹ O ivasser v <urde by mixing of 20.43 kg (45 Ib.) of sodium silicate (52 ° Baurue), 0.863 kg (1.9 Ib.) sodium bentonite, 3.95 kg ( 8.7 Ib.) Boron nitride, 11.8 kg (26.0 Ib.) Graihite, 3.677 kg (SJ Ib.) Tribasic potassium phosphate, 3.087 kg (6.8 Ib.) Zinc oxide and 0.319 k ^ (0.7 Ib.) .) Sodium alkyl sulfate with constant stirring at 4.22 icg {9 ^ 3 Ib,) prepared in a conventional glass mill for 30 hours.

The aqueous dispersion Mirde is easily sprayed to a clean one The prepared metal surface is sprayed onto a blank mold and then the mold

609819/1262

BATH

2b47363

in a; Oven for 30 min. At 177 ⁰ C (35O ⁰ F) reserved. The treated form vvies a coating of 3O _§ 4 weight? iSodium silicate, 11.8% by weight &! '. ornitride and 35.1% by weight graphite, 2.6% by weight ^? ₀ hatrium bentonite, 10.9 giv.- ^? o Potassium phosphate and 9.2 Gev. .-% zinc oxide, the thickness of which is about 51 ^ UM (2 mils)%. The treated carbon mold was used in the manufacture of bottles without wetting. The coated mold worked satisfactorily and was in continuous for about 35 hours !! Mission.

- patent claims -

609819/126

Claims (1)

Patent smells M. ' Release agents and lubricants, characterized by an aqueous dispersion a mixture of a solid lubricant, a water-soluble binder, a setting agent and a water-soluble phosphate. 2. release agent and lubricant according to claim 1, characterized in that the solid lubricant made from graphite. Boron nitride, silicon nitride, tungsten disulf id and their mixtures existing group is selected. 3. release agent and lubricant according to claim 1 or 2 _5, characterized in that the silicate binding agent is an alkali metal silicate. 4. release agent and lubricant according to claim 1, 2 or 3, characterized in that that the setting agent is made from zinc oxide, calcium chloride, magnesium sulfate, Aluminum sulfate, sodium borate, sodium fluorosilicate, kaolinitic clay and minerals as well as mixtures thereof is selected. 5. release agent and lubricant according to claim 1, 2, 3 or 4, characterized in that that the water-soluble phosphate is potassium phosphate * 6 * Release agent and lubricant according to one of the preceding claims ₅ characterized by about 50 to 70% by weight of the solid lubricant, about 10 to 40% by weight of the silicate binder, about 5 to 15% by weight of the binding agent and about 1 up to about 25 Geu - I of the water-soluble phosphate * 7 * Release agent and lubricant according to one of the preceding claims, characterized ' 609819/1262 by about 1 to 3% by weight of a solvent. δ. Process for the production of a sliding and separating coating on a surface, which comes into contact with hot glass in the manufacture of glass objects, characterized in that an aqueous dispersion of a Mixture of a solid lubricant, a water-soluble silicate binder, a setting agent and a water-soluble phosphate on the to be coated Applies to the surface and draws the water out of the dispersion to the plating to set. 9. The method according to claim 7, characterized in that the Kasser by heating the coated surface. 10. The method according to claim 7 or 8, characterized in that the to coating surface after the first coating and contact with a substantial number of hot glass objects with an additional coating provides a dispersion. 11. The method according to claim 7, 8 or 9, characterized in that the coating on the surface at a thickness between 12.7 and 127 µm (Ο, 5 and 5 mils) is maintained. 12. A method for forming glass containers, characterized in that an aqueous dispersion of a mixture of a solid lubricant, a water-soluble silicate binder, a setting agent and a water-soluble one Phosphate applied to the surfaces of a mold cavity, the water pulls out of the dispersion to form a sliding and separating layer on the surfaces of the mold cavity, a ball of molten glass in 6098 19/126? aen l'briijiohlrauni brings in, made of cut glass in the shape to the desired The container shape then forms the molded container from the mold removed. 13. Lubricants and release agents, as in, essential with reference to the attached Examples has been described. 14. Process for the formation of a sliding and separating layer on a surface, which in contact rr, it coirmit with molten glass, as ini essential has been described herein with reference to the accompanying drawings. Cl / Ru. 609819/1262