DE19855151A1 - Water-based steam chamber coating for smoothing irons and other steam-generating appliances comprises colloidal aqueous silica solution, optionally with other components such as talcum or a silane - Google Patents

Abstract

A water-based steam chamber coating for steam-generating appliances such as smoothing irons, inhalation cleaners, air humidifiers etc. which, without pretreatment of the substrate, forms a strongly-adherent, uniform dry film with a high resistance to thermal shock and enables the evaporation of water without conductive frost.

Description

Water-thinnable coating that prevents the evaporation of water Aluminum die-cast steam iron soles improved or only this enables.

In the colloidal silica are as listed in claim 2 Fillers (barium sulphate, aluminum silicate sulphate, magnesium silicate hydrate) and the coloring component, (pigments) such as titanium dioxide or iron oxides homogeneously distributed (dispensed) by means of suitable dispensing devices (dissolvers).

As described in claim 2, 3-Glicidyloxypropyl- Trimethoxysilane before or after dispensing the fillers, pigments into the Coating are stirred in, or as a sole component as Adhesion promoters (primers) can be used.

This primer is iron plating prior to applying the steam chamber applied to the untreated substrate (die-cast aluminum) and enables or improves the perfect adhesion of the coating, as in Claim 1 described.

This coating belongs to the field of paint technology / paints.

In order to achieve adhesion of the coating (previously containing solvents) to the aluminum die-cast steam iron soles, these were previously pretreated as follows:

• - Washing with soda lye
• - Blasting with corundum or sand, followed by washing with soda lye.

With both pretreatment methods, the soles had to be washed with clear water rinsed and then dried.

Only after this pretreatment could the die-cast aluminum Steam iron soles with the appropriate coating material be coated.

Process used by Rowenta.

Why coat?

If you let a drop of water fall on a hot stove, you go this does not turn into water vapor, but dances on a layer of vapor, which is (or has formed) under the drop.

This effect is not desirable with steam irons because it is used when ironing strong steam emission is desired.

The applied, firmly adhering coating promotes or enables that Water quickly and without "bubbling" (Leitenfrost) changes into the vapor phase.

This pre-treatment of die-cast aluminum steam iron soles is up to now necessary because there is still release agent on the surface is available.

This is during the spraying process (the aluminum die-cast steam iron soles) used in manufacture.

The release agent causes the die-cast aluminum steam iron soles to stick together Can be removed faster from the die and there are no "fixed runners". This release agent causes the previous coating without a previous one Pretreatment does not adhere to the surface.

By pretreating the aluminum die-cast steam iron soles there are high costs.

• - soda lye.
• - Blasting media (corundum sand).
• - Disposal of the soda lye if it is heavily soiled.
• - Disposal of the blasting media as hazardous waste, because it comes with the release agent are contaminated.
• - Cost of rinsing (waste water).
• - Costs for drying after rinsing with clear water.
• - High technical effort (immersion pool with soda lye, monitoring Radiation liquor).
• - High logistical effort (planning when which parts are pretreated have to).
• - No short-term conversion of production possible because the soles that are not yet pretreated.
• - Expiring permit to discharge the washing water into the sewer system.
• - Alternatively, a sewage treatment plant would have to be built and a permit Such an investment is questionable, if at all financially sustainable.

Due to the substances present in the release agent (waxes, silicones according to Manufacturer information), it has not been possible for the user to date, despite Pretreatment to use water-thinnable systems because they are still low Traces of this substance on the surface to be coated (aluminum Die-cast steam iron soles) are available.

These substances have a very high surface tension (like freshly polished Car paint) therefore there is no wetting of the surface and therefore no adhesion instead (beading effect when it rains on the freshly polished car paint).

Until now, the user has had to use a solvent-based coating the productivity, efficiency and quality of the aluminum die-casting Ensure iron soles.

description Recipes Legend

KK = Colloidal silica mica = Aluminum silicate hydrate talc = Magnesium silicate hydrate BaSO ₄ = Barium sulphate Silane = 3-glycidyloxypropyl-trimethoxysilian

number 1

KK = 100 GWT

No. 2

KK = 10 GWT-99 GWT BaSO ₄ = 90 GWT-1 GWT 100 GWT

No. 3

KK = 10 GWT-99 GWT talc = 90 GWT-1 GWT 100 GWT

No. 4

KK = 10 GWT-99 GWT mica = 90 GTW-1 GWT 100 GWT

All other recipes result from the mixtures of the Recipe number two to four, which in each percentage share with each other and are possible with each other.

All of the resulting recipes can be used alone or as a mixture can be combined with 0.01 GWT-99.99 GWT silane.

Advantageous as well as synergetic effects result from the use of the Coating system, in particular in that no pretreatment of the Die-cast aluminum steam iron soles are more necessary.

Even without pretreatment, the Coating system given.

By omitting the pretreatment, there is no soda lye and no Blasting abrasives (corundum / sand) are required and therefore no longer necessary be disposed of.

There is no longer any wastewater problem, as there is no more rinsing necessary is.

The soles can now be used as delivered by the manufacturer. Drying with hot air is no longer necessary, which means that energy is generated saved up.

The use of water-thinnable systems is now possible.

The dismantling of the pretreatment creates additional space for production created because the entire coating system becomes more compact.

The solvent emissions are very much reduced, as they are now water-thinnable Coating systems can be used (or ideally eliminated).

No explosion protection is necessary for the coating system, as the Coating is not flammable.

In addition, the paint / varnish store does not have to comply with the provisions of Regulation for flammable liquids.

Claims (8)

1. Steam chamber coating for steam-generating devices such as irons, inhalation cleaning devices, air humidifiers, etc., characterized in that the coating is water-dilutable and results in a firmly adhering, uniform dry film without pretreatment of the substrate, which has a high resistance to thermal shocks and evaporation of water without freezing. 2. Coating according to claim 1. 3. Marked by this, that the coating of a highly pure amorphous silica in one Colloidal solution in water with an average particle diameter of 7 nm to 120 nm (nanometers). 4. Marked by this, that the colloidal silicic acid is in mono- or polydiperser form can. 5. Marked by this, that the coating is made of colloidal silica and / or natural extracted or synthetically produced barium sulphate. 6. Marked by this, that the coating of colloidal silica and / or Aluminum silicate hydrate is made. 7. Marked by this, that the coating of colloidal silica and / or Magnesium silicate hydrate. 8. characterized in that that the coating of colloidal silica and / or 3-Glyciyloxypropyl- Trimethyoxysilane consists.