DE10131990A1 - Cleaning of hard surfaces, for e.g. removal of coal tar pitch and other materials from hard surfaces, involves using an agent containing N-methylpyrrolidone, terpene, hydroxycellulose and fatty alcohol polyglycolether - Google Patents

Abstract

An agent for cleaning hard surfaces contains (in wt.%): (A) N-methylpyrrolidone (86-96, especially 91); (B) terpene (4.5-5.5, especially 5); (C) hydroxycellulose (1.8-2.2, especially 2); and (D) fatty alcohol polyglycolether (1.8-2.2, especially 2).

Description

The invention relates to a cleaning agent and the use of Detergent for the removal of coatings containing coal tar pitch of hard surfaces, the coating containing coal tar pitch in particular, but not only, may contain asbestos.

Building materials made of thermoplastic bitumen and Coal tar pitch due to its high weather and moisture resistance as well as their excellent adhesive and binding properties for asphalting and used for sealing in particular corrosion-prone solid surfaces. Asbestos in fiber form was often added to the coal tar pitch in order to achieve the Binding strength and thus the mechanical strength of the To increase coal tar pitch.

Today such mixtures may no longer be used as building materials because Coal tar pitch high proportions of harmful, carcinogenic polycyclic aromatic hydrocarbons (PAHs), especially that Contains benzo (a) pyrene, which are solid at room temperature. Even the fibrous Asbestos is a cancer-causing substance.

When renovating components that contain asbestos-containing coal tar pitch are therefore covered, special safety measures are required to meet.

So it is common nowadays, for example in the weir interior renovation in Steel hydraulic engineering a combination of high pressure water jet and Use pressure blasting with copper slag to remove old coatings to remove asbestos-containing coal tar pitch from the steel components.

However, this method has the disadvantage that very fine dust is generated, which Contains asbestos fibers and can float freely in the air. This also applies for the PAK's, which accumulate on the dust and in this way inhaled through the ambient air by the people working in this environment can be, provided that these are not special, extensive protective measures have met against this.

The material, personnel, time and thus also the cost of such Refurbishment is very high, the risk to people, in spite of everyone Safety measures to inhale the carcinogenic substances, not completely eliminated.

The invention has for its object a cleaning agent for hard surfaces and its use for the removal, in particular, of coal tar pitch To provide coatings on hard surfaces, the Coating containing coal tar pitch, in particular, but not only, asbestos can contain, without this creates dust that in the ambient air is delivered.

• a) 86 Gew.-% bis 96 Gew.-%, vorzugsweise 91 Gew.-% N-Methylpyrrolidone,
• b) 4,5 Gew.-% bis 5,5 Gew.-%, vorzugsweise 5 Gew.-% Terpene,
• c) 1,8 Gew.-% bis 2,2 Gew.-%, vorzugsweise 2 Gew.-% Hydroxycellulose, und
• d) 1,8 Gew.-% bis 2,2 Gew.-%, vorzugsweise 2 Gew.-% Fettalkoholpolyglykoläther.

In a first aspect, the invention relates to a cleaning agent for hard surfaces, comprising

• a) 86% by weight to 96% by weight, preferably 91% by weight of N-methylpyrrolidones,
• b) 4.5% by weight to 5.5% by weight, preferably 5% by weight of terpenes,
• c) 1.8% by weight to 2.2% by weight, preferably 2% by weight, of hydroxycellulose, and
• d) 1.8% by weight to 2.2% by weight, preferably 2% by weight, of fatty alcohol polyglycol ether.

In order to color the cleaning agent according to the invention, in addition 0.5 wt .-% to 1.5 wt .-%, preferably 1 wt .-% dyes added become.

The cleaning agent according to the invention thus composed is, in particular if citrus pens are used, the smell is mild and absolutely free of So there is only methylene chloride, methanol and aromatic hydrocarbons from biodegradable components.

In a second aspect, the invention relates to the use of the above described cleaning agent for the removal of coal tar pitch Coatings of hard surfaces, the coal tar pitch containing Coating in particular, but not necessarily, may contain asbestos, characterized in that the detergent undiluted on the Coal tar pitch coating is applied and that after a Exposure time, which depends on the thickness of the coating containing coal tar pitch depends, but experience has shown that it is 15 minutes to 10 hours Coal tar pitch coating can be removed.

The advantage of using the cleaning agent according to the invention is above all in that this does not result in dust containing PAH and asbestos. Dust generation would require protective measures which consist in the fact that the number of people in the affected area the necessary minimum is to be limited. Furthermore, this work area be separated from the environment in a dust-tight manner. By a sufficient Dimensioned ventilation system with exhaust air filter must be ensured that the work area is sufficient to reduce the concentration of asbestos fibers is ventilated and sufficient vacuum is maintained, provided that Foreclosure cannot be made dustproof. Negative pressure and Dust concentration in the room air must be monitored automatically. at A drop in vacuum must be triggered automatically and acoustically. In addition, the work area may only be Decontamination systems (security gates) are entered or left. On Similar lock system is used to transport the material into the partitioned area and the removal of the detached bitumen and filtered dusts.

By using the cleaning agent according to the invention The aforementioned protective measures are reduced to a minimum because the Coal tar pitch containing coating after an exposure time that of the Thickness of the coating depends, easily using simple (scratching) tools in Remove the form of large, coherent, pasty pieces from the surface leaves. There is no dust that could pollute the surrounding air and that Asbestos fibers remain on the coating containing coal tar pitch bound, so do not get into the air.

Another advantage of the use according to the invention is that the as Hazardous amounts of material to be disposed of are very small, because in addition to the small amounts of the cleaning agent according to the invention no additional Fabrics used in cleaning. In contrast to that fall with the Application of the state of the art through the use of copper slag, Sand or other abrasive materials for mechanical detachment of the Coal tar pitch coating under high pressure large amounts of PAH and asbestos-containing materials, the transportation and deposition of which is environmental burden and are very expensive.

The application of the cleaning agent according to the invention to the one to be removed Coating can be done, for example, with a brush, a roller or a Spatula successes. However, it has been shown that the use of a compressed air Spray gun a particularly even and economical distribution of the Detergent allowed.

Tests have shown that the cleaning effect of the invention Detergent is increased if the surface to be cleaned is additional is warmed up, preferably to temperatures above 20 ° C.

Another aspect of the use of the cleaning agent according to the invention is that after the detergent on the coal tar pitch Coating was applied, this coating is covered with a film. This reduces the evaporation of the cleaning agent Exposure temperature increases and thus the solution effect intensified and the Exposure time reduced.

A final cleaning of the surface of any residual components Coating can be done with relaxed water.

Further tests have shown that the cleaning agent can also be used to remove The best bitumen, resins, adhesives, two-component systems, oils and greases suitable is.

Claims (10)

1. Cleaning agent for hard surfaces, containing a) 86% by weight to 96% by weight, preferably 91% by weight of N-methylpyrrolidones, b) 4.5% by weight to 5.5% by weight, preferably 5% by weight of terpenes, c) 1.8% by weight to 2.2% by weight, preferably 2% by weight, of hydroxycellulose, and d) 1.8% by weight to 2.2% by weight, preferably 2% by weight, of fatty alcohol polyglycol ether. 2. Cleaning agent according to claim 1, characterized in that it additionally 0.5% by weight to 1.5% by weight, preferably 1% by weight, of dyes contains. 3. Cleaning agent according to one or more of claims 1 to 2, characterized in that it is in liquid and / or pasty form. 4. Cleaning agent according to one of claims 1 to 3, characterized in that the cleaning agent is mixed with other cleaning components. 5. Use of the cleaning agent according to one or more of the claims 1 to 4 for the removal of coatings containing coal tar pitch hard surfaces, the coating containing coal tar pitch in particular, but not necessarily, may contain asbestos, thereby in that the detergent undiluted on the coal tar pitch Coating is applied and that after an exposure time by the thickness of the coating containing coal tar pitch, which from experience, however, is 15 minutes to 10 hours Coal tar pitch coating can be removed. 6. Use of the cleaning agent according to claim 5, characterized in that the cleaning agent with the help of brushes, rollers, spatulas or Compressed air spray guns to be removed from the coal tar pitch Coating is applied. 7. Use of the cleaning agent according to one of claims 5 or 6, characterized, that the surface to be cleaned is heated. 8. Use of the cleaning agent according to one or more of the claims 5 to 7, characterized in that the detergent applied to a solid surface with a Foil is covered. 9. Use of the cleaning agent according to one or more of the claims 5 to 8, characterized in that a final cleaning of the surface with relaxed water he follows. 10. Use of the cleaning agent according to one or more of the Claims 5 to 9, characterized in that also bitumen, paints, resins, adhesives, two-component systems, oils and greases can be removed from hard surfaces.