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Chemikálie

Agents for other purposes

Přidat

Blackening is among most common ways of steel colouring for both decoration and, to a lesser extent, anticorrosion protection (optical appliances, hunting arms, fancy-goods). A very thin coating is formed by a mixture of both ferric and ferrous oxides of dark blue-to-genuine black colour. A perfect blackened finish of high gloss may be merely achieved if the steel substrate is machined as much fine as possible. The steel parts for blackening must be cleaned for the pure metal appearance, free of any rust, mill scales and grease which otherwise might result in colour imperfections and spots in the coating formed. Due to a very low thickness, the blackening coating will copy all defects (mars, scratches, local roughness) on the substrate surface which thus should be avoided. For a glossy finish of the utmost quality, the steel parts to be blackened should be polished (e.g. barrel-polished) at first. On the other hand, a matt finish may be achieved through a slight roughening of the substrate. To enhance both corrosion performance and mechanical durability of the blackening coatings, a subsequent passivation with the agents containing adsorption-based corrosion inhibitors is strongly recommended. For further increase in the performance, an impregnation of the blackening with oil-based preservatives for temporary corrosion protection, after its drying out, is advisable which, moreover, will emphasize the black tone of the coating. If the drying operation of the blackened coating is not possible to be included in the line, the preservation with oil-based water-removers containing adsorption corrosion inhibitors should be preferred. As a principle, only plain carbon steels may be blackened in superior quality and the steels of a higher silicone content should be pickled with 10 % hydrofluoric acid at first.

Pragokor Brunigal S
alkaline blackening agent of high performance for the parts made of carbon steel

Pragokor Brunigal S
alkaline blackening agent of high performance for the parts made of carbon steel

A very efficient agent for alkaline blackening of steel parts. The coating deposited features very good durability against wear and is of superior decorative finish and deep black tone.

Pragokor Brunigal S should be used in the concentration of 80 kg per every 100 litres of the bath. The respective amount of the agent should be at first dissolved in the container half-filled up with water and, after the complete dissolution, replenished with water for the running volume and finally heated up for the operating temperature 135 - 145 °C, the operation time being 5 – 15 minutes according to the composition of the steel to be treated and required coating appearance. The water evaporated during operation must be continuously refilled. In case of a decline of the bath performance, the agent should be stepwise dosed carefully, the overall amount of which being governed by the demanded bath temperature – at a low bath concentration the bath boiling point drops below 135 °C. Owing to the possibility of hot bath splashing, the necessary safety precautions must be strictly observed. The bath pollution with copper (introduced e.g. from the parts made of copper or its alloys) must be avoided as, at the copper concentration as low as 5 mg/litre, a non-uniform colour of the blackening might occur.

Pragokor Brunigal N
versatile blackening salt with anticorrosion performance for the parts made of both carbon as well as alloy steels

Pragokor Brunigal N
versatile blackening salt with anticorrosion performance for the parts made of both carbon as well as alloy steels

It is a more versatile blackening salt for the treatment of carbon as well as alloyed steel parts, suitable for blackening of cold-drawn, cold-rolled and heat-treated steel parts and for cast iron as well. Furthermore, as for the copper plated coatings after cold-drawing operations, copper-based solders and, under certain conditions, silver, a dark colouring may be achieved. The running bath should be prepared by the dissolution of the agent in water in the weight ratio 1 : 1. The heated container should be at first filled up with water for half of its volume and then the calculated amount of Brunigal N step-by-step dissolved. The freshly prepared bath is of colourless-to-yellowish colour and as late as at running is gradually acquiring a brown tone. The boiling point of the fresh bath is 138 °C, the running temperature of which ranging within 135 - 148 °C and the operating time 5 – 15 minutes.
 

Properties of the blackening coating:

  • black colour
  • thickness 0,5 - 1,5 um
  • specific weight-per-area unit value 7,5 g/m2

In comparison with common blackening baths, the Pragokor Brunigal N bath features:

  • The bath surface is free of any foam and, even without a foam cover, undesirable bath splashing as well.
  • The viscosity of the blackening bath is very low (close to that of water) which, consequently, cuts down the bath drag-out by 30 % if compared with the common blackening agents. The decline in pollution of the subsequent rinse water with the salts transferred from the running bath, therefore, results in a reduced demand for rinse water.
  • The blackening coating is highly compact even at an enhanced thickness and of a very decorative deep black tone.
  • Excellent durability against wear and increased anticorrosion performance.
  • The corrosion inhibitors contained in the Brunigal N agent will cause a reduced bath sludge formation and, therefore, are able to preserve the original gloss of the blackening while a restrained sludge formation accounts for reduced cost for waste water disposal.
  • High bath concentration enables the start-up of the bath to be realized in the agent/water ratio 1 : 1 by weight optimally.
  • The blackening process in the Brunigal N bath is less susceptible to fluctuations in bath concentrations than the common baths.
  • At normal running conditions, the lifetime of the bath is supposed for several years.
  • At an enhanced bath loading, both bath regeneration and occasional sludge removal are recommended.
  • The Brunigal N agent is optimally suitable for the closed circuits, i.e. for the blackening lines with 100% recycling of rinse water, however, the excellent water utilization may be even achieved in the common technological lines with flowing-through rinses.

Spheres of usage

a) As a separation agent to ease separation of both plastic as well as rubber mouldings from the moulds and at retreading of the tyres
b) As a separation agent in foundry industry (shell moulds) to prevent sticking of the sand mixtures on the surface of metallic patterns
c) For the final treatment (impregnation) of the paper printed in the rotary printing machines

Pragokor Emulsion of Silicone Oil 35%

Pragokor Emulsion of Silicone Oil 35%

silikone oil content: 35%

Pragokor Emulsion of Silicone Oil 60%

Pragokor Emulsion of Silicone Oil 60%

silikone oil content: 60%

Pragokor Soldering Fluid F
suitable for soldering of the galvanized parts

Pragokor Soldering Fluid F
suitable for soldering of the galvanized parts

It is predominantly convenient for soldering of galvanized surfaces but, excluding aluminium and its alloys, may be used for other common metallic materials as well. Residues of the agent should be flushed away with water thoroughly or, if necessary, with diluted soda solutions, after soldering. For removal of extremely stuck soldering flux, solutions of citric or tartaric acids should be used.

 

Pragokor Soldering Fluid R
sfor the surface auitable ctivation before soft soldering

Pragokor Soldering Fluid R
sfor the surface auitable ctivation before soft soldering

An agent, suitable especially for the plumbers, for the surface activation before hand soldering of all metallic materials, excluding only aluminium and its alloys. Residues of the agent after soldering should be flushed away with water thoroughly or, if necessary, with diluted soda solutions. For removal of extremely stuck soldering flux, solutions of citric or tartaric acids should be used.

Pragokor Soldering Fluid S
suitable for soft soldering of all common metals excluding aluminium

Pragokor Soldering Fluid S
suitable for soft soldering of all common metals excluding aluminium

It is a soldering fluid with a hydrochloric acid content, suitable for soft soldering of all common metals, excluding only aluminium and its alloys. It features excellent capability of surface activation even on highly oxidized surfaces. Residues of the agent after soldering should be flushed away with water thoroughly or, if necessary, with diluted soda solutions. For removal of extremely stuck soldering flux, solutions of citric or tartaric acids should be used.

 

Pragokor TAV 311
agent for the soldering of aluminium and its alloys

Pragokor TAV 311
agent for the soldering of aluminium and its alloys

It is a fluxing agent for the soldering of aluminium and its alloys capable of cleaning the surface of the metal to be soldered. It boosts both wetting of the metal surface and spreading of the melted solder.

Way of application:

Small amount of the agent should be suspended in distilled water, mixed thoroughly and applied with a brush onto the solder wire. After heating up by a soldering torch and evaporation of water, the melted salt will remove surface oxides which otherwise might impede proper wetting and, consequently, metal jointing. A residual fluxing agent on the joint should be washed away with hot water and a brush.

 

Pragokor TAV 313 S
agent for welding of aluminium and its alloys

Pragokor TAV 313 S
agent for welding of aluminium and its alloys

It is a fluxing agent for welding of aluminium and its alloys. It cleans the surfaces to be jointed and boosts spreading of a filler metal

Way of application:

Small amount of the agent should be suspended in distilled water, mixed thoroughly and applied with a brush onto both the metal filler and the contact surfaces to be jointed.. After heating up by a soldering torch and evaporation of water, the melted salt will remove surface oxides which otherwise might impede proper wetting and, consequently, metal jointing. After welding, a residual fluxing agent on the joint should be washed away with hot water and a brush.

 

Pragolub 1112
lubrication agent to facilitate forming and drawing operations of metals

Pragolub 1112
lubrication agent to facilitate forming and drawing operations of metals

A liquid lubrication agent, free of any oil substances and easy to be rinsed with water, which facilitates metal forming operations such as stamping or cold-drawing. Besides, it features an enhanced inter-operations anticorrosion protection of the metallic sections formed. It should be applied, together with soap or stearate lubrication, after phosphating process to improve sliding of the sections to be formed. The Pragokor 1112 agent should be added to the soap or stearate solutions currently being used for drawing, in about 10% amount, related to the soap content. This enables the soap concentration for drawing to be cut down by 20 – 50 % and the application temperature by 20 - 30 °C while boosting lifetime of the soap bath substantially. Furthermore, the agent is able to restraint formation of incrustation of fat acids in the soap bath due to the drag-out of acids components from the previous phosphating operation into the soap solutions. As a sole lubricating agent, Pragolub 1112 proved in the concentration 1 – 5 % for cold-drawing and stamping operations of steel, brass and aluminium, e.g. for stamping of the gun cartridges made of phosphated steel or brass sheets, thread forming and inscriptions stamping with stamping dies. In all applications with Pragolub 1112 like those, lifetime of the cutting tools are extended substantially.

The agent may be applied by both immersion and spraying at the recommended operating concentration and temperature.

 

Pragolub 1300
lubrication, passivation and water-repellent agent for metal forming and drawing

Pragolub 1300
lubrication, passivation and water-repellent agent for metal forming and drawing

A liquid agent for lubrication, passivation and hydrophobization of activated metallic surfaces, predominantly for copper alloys and silver. As a result of a chemical reaction on the metallic surface, the agent is able to create chemisorpted or chemically bonded monomolecular layers even on the easily sulfides-forming metals. It should be applied on the metallic surfaces being preactivated by pickling, degreasing, metal plating, barrel-tumbling etc. The agent was particularly developed as a permanent surface treatment of gun cartridges because, after lubrication with it, the surface friction between the moving cartridge and the magazine, gun-barrel and gunlock at both ambient as well as enhanced surface temperatures at fire is being reduced significantly. This enables to increase the shooting cadence and overall reliability of the machined arms. Unlike the common lubrication with oils, vaselines or waxes, the impregnation with Pragolub 1300 is much more durable without easy-to-be washed or wiped off at handling.

 

Pragolub 1400
emulsion of lubrication agent for metals forming

Pragolub 1400
emulsion of lubrication agent for metals forming

Pragolod 1400 is a liquid water-based lubrication emulsion which makes the forming operations of metallic sections, such as shaping, pressing and drawing, more easy, the forming tools employed are being greased and cooled down at these operations as well. Furthermore, it will impart temporary inter-operation protection of steel and non-ferrous metals against corrosion. It contains no oil matters and is easy to be rinsed with water. The organic substances contained are easily biodegradable.

To be used at all forming operations of the common metallic sections made of steel, copper, zinc and aluminium and their alloys and, in a way, as a replacement of the rape seed oil-based lubrications and may even substitute both phosphating as well as soap lubricating processes before the cold forming operations. As a replacement of the rape seed oil lubrication, the overall consumption of organic matters will drop substantially (for about one tenth) in the forming operations. The agent will extend the life fo the forming tools considerably as well.

 

Pragolod 1009
two-component strongly alkaline agent for removal of residues of old paints or paints of substandard quality

Pragolod 1009
two-component strongly alkaline agent for removal of residues of old paints or paints of substandard quality

It is a two-component strongly alkaline agent for removal of miscellaneous old paints or paints of substandard quality and varnishes from the ferrous substrates. As a stripping agent, it is suitable for the substrates durable to strongly alkaline environment such as ferrous metals and copper alloys but should be not used for aluminium alloys, zinc, lead or tin. As for the types of organic paints, it performs well for alkyds, acrylates, polyesters, epoxides and other synthetic resins. On the contrary, the agent is less efficient for stripping of the paints based on rubbers, bitumens, asphalts, phenolic resins and some types of epoxides and polyurethanes. The substrate becomes passivated against corrosion after stripping process.

In the paint stripping technology Pragolod 1009, a combination of basic strongly alkaline concentrate Pragolod 1009 together with a mixture of organic solvents and surfactants Pragkokor DT 1009 is employed, the way of application being immersion at recommended concentration and temperature.

 

Pragofos 1008 L
liquid concentrate for removal of phosphate coatings and residues of lubricants

Pragofos 1008 L
liquid concentrate for removal of phosphate coatings and residues of lubricants

It is a liquid concentrate for the preparation of the bath for removal of phosphate coatings and residues of soaps and lubricants after drawing metallurgical operations. Furthermore, the agent may be used for degreasing of strongly contaminated or impregnated steel parts. Pragofos 1008 L should be used in combination with other surfactant components – Pragofos DT 1008 L for immersion application and Pragolod DT 57 as a low-foaming additive for spraying. The bath should be operated at elevated temperatures: 80 - 90 °C for removal of phosphate coatings while 60 - 80 °C for degreasing will do. With regard to the strong alkalinity of the bath, the agent is suitable for the substrates made of steel or cast iron only.

 

Pragolod AF 50
defoaming additive of high performance

Pragolod AF 50
defoaming additive of high performance

A liquid of low viscosity suitable for a rapid foaming suppression of all types of the Pragolod brand degreasing baths or other baths for surface treatment processes. It is a mixture of both organic substances and non-ionic surfactants. It should be dosed into the degreasing baths either regularly as a part of the bath maintenance schedule or only occasionally if an acute need for foaming suppression instantly occurs, very often at operating of the fresh bath or due to accumulation of the foaming impurities on the bath surface.

Pragolod AF 54
quick-operating defoaming additive of very high performance

Pragolod AF 54
quick-operating defoaming additive of very high performance

Highly efficient and quick-operating defoaming additive for the foaming suppression of all types of the Pragolod brand alkaline degreasing baths. It may be applied in the degreasing processes regenerated by both micro and ultrafiltration as well. It should be dosed into the degreasing baths either regularly as a part of the bath maintenance schedule or only occasionally if an acute need for foaming suppression instantly occurs, very often at operating of the fresh bath or due to accumulation of the foaming impurities on the bath surface.

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