DE1953714A1 - Process for corrosion protection and gloss distribution for sheet metal packaging - Google Patents

Description

DR. BERG DIFL.-ING. STAPF

PATENT LAWYERS
MUNICH 2. HILBLESTRASSE ZO

Dr. Berg Dipl.-Ing. Stopf, 8 Munich 2, Hllblestrofle 20

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date

October 24, 1969

Attorney file 18 974

Politechnika Gdaneka G d a fit β k, Poland

Inventor: Doz. Ur. Ing. Komuals Juchniewicz Procedure for corrosion protection and gloss distribution for Tin packaging Patent period:

The subject of the invention is a method for corrosion Securing and splitting of shine for sheet metal packaging, in ■ endere such for groceries.

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(MIl) * 5 U 20 81 telegram! PATENT UNION Munich Bank! Bayerliche Verelnsbarsk Manchen 453100 Pottscheck. Munich 653 43

*% 19537 H.

The current procedure for protecting packaging against corrosion after sterilization or pasteurization therein, this with a temporary protective agent in the form of an emulsion, a smear layer or Paraffin layer to cover. A lack of these methods is the inadequate protection against those on the packaging during the sterilization or pasteurization process beginning and despite preservative ^ layer further corrosion during storage «

There are as yet no methods for preventing corrosion in the literature and gloss distribution for sheet metal packaging made of tinned steel sheet, which the Recommend adding an inhibitor mixture to the water during the sterilization or pasteurization process.

However, a number of inventions are known, which in different Industrial sectors using mixtures of inorganic and organic inhibitors, a synergetic effect Apply effecting additives. These mixtures, which are selected mainly on the basis of experience, are based on each other <does not affect the theoretical interrelationships considered in the invention.

The inventive method is based on the fact that a Mixture of inorganic and organic inhibitors with common Anion creates a synergetic effect and with the participation of a detergent and shine in the element

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Steel tin coating causes a strong anodic polarization.

The inhibitor mixture creates a persistent complex that by its adsorption on the surface, the concentration of aggressive anions lowers the binding forces between Metal and passivating oxygen increase the potential the packaging below the formation of pitting holds critical potential and deepens the passivating properties of the solution.

t The is eleent processes cause the anodic dissolution of the steel and its immediate passivation. Under such conditions, the surface of the packaging is subject to electropolishing and gloss treatment. At the same time, electrochemical precipitation and coagulation of some colloids take place in the pores of the coating, which further compacts the tin coating on the steel.

The aim of the invention is to secure galvanized sheet steel manufactured packaging from corrosion while at the same time Glow in the process of sterilization or pasteurization, without the need for additional Preservation in the later storage period

According to the invention, this aim was achieved through the application a mixture of chemical compounds of precisely defined composition, with the process of securing against corrosion

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as well as the gloss distribution together with the sterilization or pasteurization process.

Depending on the chemical composition of the water and its hardness as well as the type of sheet metal, the inhibitor mixture, consisting of an inorganic inhibitor, an organic inhibitor that has a common anion, a detergent and a rinse aid for the packaging, dissolved in water and mixed with the water the packaging filled pasteurization tub or the Autoclave added -

In the case of steam autoclaves, the mixture is in the form of a paste in a perforated container at the steam inlet of the autoclave housed.

The mixture is poured onto the bottom of the autoclave in a horizontal autoclave scattered »

Disodium orthophosphate, hexasodium metaphosphate, water glass, sodium nitrite and borax are used as inorganic inhibitors used; as organic - a common anion possessing inhibitors, which together with other Inaätz the synergetic Effect, the phosphates: Triethanolaainphosphat, Urotropine phosphate, p-nonylphenol phosphate, styrofen phosphate; the silicates: 4-phenoxyalkane, 4-butoxysilane, calcium silanolate, Aminoalkylpolysiloxane; the nitrites: guanidine nitrite, di-iao-butylamine-nitrite, piperidine nitrite, dicyclohexyl-amino-

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nitrite; the borates: cyclohexylamine borate hydrate, triethanolamine borate, Boric acid triphenyl ester is used; as detergent are water glass, sodium dodecylbenzenesulfonate, ethoxylated Anhydrosorbitoleate, ethoxylated pentaerythritol monooleate, ethoxylated p-nonylphenol used; as a brightener sodium peroxyborate is used.

The amount of the inhibitor mixture is determined depending on the amount of water used for the fasting or sterilization, its chemical composition and hardness as well as the type of sheet metal. It is between 0.05 % and 0.6 % based on the amount of water, with the following proportion of the individual bed parts:

inorganic inhibitors: 40 - 60 Jt organic inhibitors with

common anion: 15 - 45 Jt

Detergent 10 - 20 % Gloss agent - 5 - 20 fi

The pH of the solutions is when using phosphate inhibitors about 9, with nitrites always above 6.5, with silicates up to 7, for borates about 7.

The module of the water glass used should be between 2 and 4,

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After pasteurization or sterilization, the dried ones or wiped packagings are handed over to the magazine and arranged without further handling using interlayers made of materials that in addition are saturated with the inhibitor mixture, one of which may be a volatile corrosion inhibitor.

The method according to the invention is based on the following examples ^ play explained in more detail:

Example 1.

To 1000 1 technological water of 0 German hardness used for the sterilization of 1000, made of electrolyte sheet 0.5 kg tin cans, is kept stirring the mixture previously dissolved in water of:

250 grams of disodium orthophosphate

100 g triethanolaain phosphate
"100 g sodium dodecylbenzenesulfonate

100 g sodium peroxyborate

250 g water glass
admitted.

In the homogeneous inhibitor solution, the pH value is about 9 Sterilization carried out.

The dried deses or those freed from the surface water layer by wiping are used without further preservation.

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brought into a magazine and when setting up with both sides provided with intermediate plates saturated with sorbitol monooleate. The packaging secured in this way does not show any signs of corrosion in the magazine for a period of up to 2 years.

Example 2.

In 500 1 technological water of 2 German hardness, used for the pasteurization of 500 1 kg packaging made from hot-dip tin-plated sheet metal, the mixture previously dissolved in water of: 200 g sodium nitrite
90 g di-butylamino nitrite
75 g ethoxylated pentaerythritol monooleate 75 g sodium peroxyborate
250 g water glass
admitted.

In the homogeneous inhibitor solution, the pH value is approx. 8.5 pasteurization is carried out.

The dried packaging is covered with intermediate plates soaked on both sides with ethoxylated pentaerythritol monooleate Mistake. The packaging secured in this way shows no signs of corrosion for a period of up to 2 years.

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Example 3.

In the steam pressure autoclave there is a perforated one at the steam inlet A container containing an inhibitor mixture with a paste-like consistency of the following composition, hung up:

250 g water glass

250 grams of sorbitol monooleate

150 grams of sodium peroxyborate

250 g disodium orthophosphate
50 grams of hexa-sodium metaphosphate.

The steam stream hits the container and becomes saturated with the inhibitors. After the sterilization process, the dry cans without additional preservation in the magazine and are stored with intermediate plates on both sides with a mixture of equal parts of sorbitol monooleate and fentaerythritoleate are soaked in faraffin oil. The secured ones Packaging shows no signs of corrosion for a period of up to 2 years.

Example 4.

For 500 liters of technological water of 10 ° German hardness, used for pasteurizing 500 from electrolytically tinned 1 kg packs made from sheet metal are mixed with a mixture previously dissolved in water, consisting of:

250 g water glass from module 2-4

100 g of 4-butoxysilane

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70 g ethoxylated anhydrosorbitoleate 70 g sodium peroxyborate

admitted. In the homogeneous inhibitor solution with a pH value of about 7 pasteurization is carried out «The dried or Remove TQB from the superficial water layer by wiping it off Cans get into the magazine without further preservation and are stored using intermediate plates, the on both sides with a mixture of sorbitol monooleate and Pentaerythritol monooleate with a »- addition of dicyclohexylamine nitrite are soaked. The packaging containers secured in this way show up to 2 years in storage no signs of corrosion

Example 5.

To 500 1 technological water of 14 German hardness used to sterilize 500 pieces of hot-dip tinned sheet metal manufactured 0.5 kg packaging containers in the autoclave a mixture of:

200 g borax

100 g triethanol aminoborate
75 g ethoxylated pentaerythritol monooleate 75 g sodium peroxyborate

admitted. In the homogeneous inhibitor solution with a pH of approx. 7.5 the sterilization is carried out in the Bruckautoklaren. The dried or from the superficial layer of water Cans freed by wiping get into the magazine without additional preservation and are stored using νen

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Intermediate plates made of paraffins on both sides! ait 50 years "additional clay pentaerythriteonooleate impregnated material" The packaging containers secured in this way show no signs of corrosion when stored for up to 2 years.

Example β.

A mixture consisting of fig inhibitors is sprinkled on the bottom of a horizontal autoclave:

300 g water glass

250 g of dinatrium orthophosphate

100 g p-nonyl phenol phosphate
75 g ethoxylated pentaerythritol nonooleate

100 g sodium peroxyborate.

Then 3 baskets ait 2000 0.25 kg packaging in put in the auticlave, poured about 1000 l of water and according to the technological requirements, the sterilization carried out. After sterilization, the dried ones or from the superficial layer of the waaaaaaa by wiping freed cans brought into the magazine »

When 2 autoclaves work in parallel, 3 sterilizations are required to introduce the inhibitors, the fourth · sterilization on the other hand, it must be carried out without inhibitor addition.

The invention can be used in different areas of the food industry, the products in the "Bleekr · r packs,

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Find use. Resulting from the application of the invention The resulting technical advantages are the avoidance of corrosion during the production of the products and to be seen during their storage. The exterior of the packaging looks more aesthetic, the corrosion of the autoclaves, trolleys and the equipment used during sterilization or pasteurization is kept secret. In addition, there is no need to To coat the packaging containers with fat or emulsions, creating better conditions for sticking of the label and the aesthetics are enhanced, as the label no longer has any greasy areas. Likewise the workload for cleaning the packaging is reduced.

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Claims (1)

- ¹² - 19537H Patent claims: . 1.) Procedure for corrosion protection and gloss distribution for Sheet metal packaging, characterized in that one Disodium orthophosphate and / or hexasodium metaphosphate and / or water glass and / or sodium nitrite and / or borax and organic derivatives of these compounds, which have a common anion, as well as a detergent and a ^ Mixture containing gloss agents, if necessary after -prior solution in a little water, with constant stirring add to the water in the autoclave or pasteurizer that is filled with the packaging, followed by the sterilization or pasteurization according to known technological Conditions and then the dried or wiped packaging for the purpose of its storage if necessary, using intermediate plates made of a material impregnated with inhibitors on both sides, "2. The method according to claim 1, characterized in that one as organic phosphates triethanol aminophosphate and / or urotropniphosphate and / or p-nonyl phenol phosphate and / or Styrofen phosphate, as organic silicates 4-phenoxysilane and / or 4-butoxysilane and / or calcium silanolate and / or Amino-alkylpolysiloxane as organic nitrite Dicyelohexylaminonitrite and / or diieobutylaminonitrite and / or piperidine nitrite and / or guanidine nitrite and as organic borates 009825/2063 «13 - Cyclohexyiaminoborate hydrate and / or triethanolaminoborate and / or triphenylboronic acid esters are used. 3. The method according to claim 1, characterized in that ale detergent waterglass and / or sodium dodecylbenzenesulfonate and / or ethoxylated pentaerythritol monooleate and / or ethoxylated p-nonylphenol are used. 4. The method according to claim 1, characterized in that sodium peroxyborate is used as the brightening agent. 5. The method according to claim 1-4, characterized in that the amount of the mixture 0.05 to 0.6 ^ based on the amount of water is, with the following proportion of the individual mixture components: inorganic inhibitors $ 40- $ 60 organic inhibitors of
common anion 15 - 45 % detergent 10 - 20 # Gloss agent 5 - 20 % 6 «Method according to claims 1-6, characterized in that that the solutions based on the phosphate inhibitors used for pasteurization or sterilization have a pH value approx. 9, based on the nitrite inhibitors, a pH value siütts above 6.6, based on dtr silicate inhibitors, a pH value «14 - 009825/2063 \ ¹⁴ ~ 19537H above 7 and based on the borate inhibitors a pH value have over 7, with the water glass module between 2 and 4 should be " 7, method according to claim 1, characterized in that In a steam autoclave or horizontal water autoclave, pour the mixture into a »perforated container on Daapf or Water inlet of the autoclave is housed. 8, the method according to claim 1-7, characterized in that dadttreh the plates used for the intermediate layers when storing the packaging on both sides are impregnated with an inhibitor mixture, one the inhibitors of the mixture can be a volatile corrosion inhibitor. 009825/2083