DE2412475A1 - Incombustible corrosion-protection of steel reinforcements - in light concrete, based on mixt. of fillers, corrosion-protective pigments, lacquer resins and two bitumens - Google Patents

Abstract

Incombustible corrosion protective materials for steel reinforcements in light concrete, esp. aerated cement processed in automated plant, are prepd. by (a) admixing a mixt. of fillers, corrosion-protective pigments and lacquer resins with =2% PVA, =3% Ca stearate, =2% fatty amine, =2% butanol and =55% chlorinated aliphatic hydrocarbon, esp. C2Cl4; (b) grinding these components in a mill and then adding is not >25% of a mixt. of two comminuted or dissolved bitumens with different softening points >100 degrees C and is not 25% of same chlorinated hydrocarbon solvent and renewedly grinding so that grain dia. achieved (Grindometer grain fineness) is =10 mu. Wt. ratio inorg. solids to org. binder is >1, esp. 1.2. Pref. all inorg. solids are ground with the polar components of the binder mixt. in a preliminary step.

Description

Building Academy of the German Democratic Republic Process for the production a non-flammable corrosion protection substance for steel reinforcement in lightweight concrete The invention relates to a method for producing an incombustible corrosion protection substance for steel reinforcement in lightweight concrete, especially for aerated concrete used in automated Production equipment is processed.

It is known to use natural asphalt, blown bitumen, mineral fillers, Pigments and orange flammable solvents for the production of anti-corrosive substances to use. Furthermore, it has already been proposed to use a mixture of formica, To use cement and organic solvents as well as mixtures of cement, Coal tar pitch, plastic dispersions, cement retarder and water in one Manufacture ball mill.

All anti-corrosion agents that use conventional organic solvents and whose solvent-air mixtures are explosive, are flammable and therefore require processing plants with additional fire and explosion protection.

In addition, the evaporation rates are the usual paint solvents up to now so bocb that with a cycle time of z. B. 6 min the temperatures in the drying oven or dryness level must be at least 120 in the entire drying area.

Usual aromatic-containing solvents are moderately to severely harmful to health, Aqueous corrosion treasure systems, while incombustible, currently have still a long drying time that they can be used in automatic immersion systems with a cycle time from Z. 3. 6 minutes cannot be used.

The purpose of the invention is to produce a highly effective anti-corrosion agent, to which these technical, physiological and economic shortcomings do not adhere.

The invention is based on the object of a method for production to develop an anti-corrosion agent to protect steel reinforcement can be used in lightweight concrete, is submersible, sprayable and streiebfäbig, short Has drying times at relatively low drying temperatures, low tendency to sedimentation its inorganic solids, incombustible and in automatic immersion and drying systems can be processed. In addition, the solvent used should be used Little or no health hazard and the solvent-air mixture is not explosive be.

According to the invention, known fillers, anti-rust pigments and Put lacquer resins in a mill and add up to 2% polyvinyl alcohol to this mixture, up to 3% calcium stearate, up to 2% fatty amine, up to 2% butanol and 55% one chlorinated hydrogen, preferably perchlorethylene.

This mixture contains only the polar components of the binder mixture and contains all inorganic components, is ground in the mill. Thereafter becomes up to 25% a mixture of 2 crushed or dissolved bitumen with different Softening points above 100 ° C and up to 25% of the same solvent Ccblorierter Hydrocarbon, preferably perchlorethylene) added and grinding continued, until the arindometer grain fineness of at most 10 µm is reached.

The ratio of the amount of inorganic substances to the amount of organic bonding agents should be at least 1.0, preferably 1.2.

This process made it possible for the first time to obtain a corrosion protection substance for producing steel reinforcement in lightweight concrete that is non-combustible and its Solvent-air mixtures are not explosive. The anti-corrosion agent is can be processed in automatic smoke and drying systems with relatively short cycle times, reveals an anti-rust pigment system with high effectiveness, which is contained in the non-combustible, Little or no health-damaging organic solvents against sedimentation is stabilized and at lower temperatures to be dried Can be used as an anti-corrosion agent with known flammable solvents.

The breakdown of the grinding process according to the invention into two stages makes it possible to use the pigment and extender grain exclusively with polar organic Organophilize binders, reducing the tendency to sedimentation in the incombustible Solvent is effectively combated.

The reduction in the tendency to sedimentation is due to the combination of calcium stearate, fatty amine, olophen and linseed oil as well as the tendency of the Zinc tetraoxichromate in this binder mixture. The adhesive strength and autoclave resistance at 190 ° C and pH = 12 in concrete deprived of the use of two different softening bitumen and an addition of polyvinyl alcohol, the plastic bitumen with a softening point ring and @ugel around 100 ° C and the polyvinyl alcohol serve as an intermediary for steel. The brittle bitumen with a softening point ring and ifugel around 125 ° C guarantees the biological stability of the paint film at the autoclave temperature of 190 ° C. The possibility of the paint according to the invention to dry within 6 min at a temperature of 8o to 90 ° G, rubbed on the use of a solvent with an evaporation number less than 10 and a recipe formulation with a solids-to-agent ratio of at least 1.0, preferably 1.2.

the corrosion protection substance produced according to the invention is non-flammable, not explosive and not or only slightly harmful to health and thus increases significantly the safety of workers in the manufacturing and processing industries.

This property also reduces the investment costs for manufacturing and processing technology, as the systems are not explosion-proof need to be.

By reducing the drying temperature by around 30 ° C, thermal energy is generated saved. The inorganic solids produce very little sedimentation by extending the Service life of the immersion tank contents a Change in the specific costs for corrosion protection.

By processing a paint with a relatively high The solid-binder ratio becomes the film mass that drips off in the drying stands minimized.

The invention is to be described in more detail below using an exemplary embodiment explained.

The following substances are placed in a ball mill: 12.5 percent by weight Slate powder 2.4 "sikalite 8.7" red lead powder 1.5 "zinc tetraoxichromate 2.9 "M-Kolophen X 100 1.7" linseed oil stand oil 0.7 "polyvinyl alcohol 1.7" calcium stearate 0.5 "Fettamin sp raw 0.15" n-Butanol 34.85 "Perchlorethylene This mixture is rubbed in a ball mill for about 20 hours, then the muller is opened and after addition of ton 11.0 percent by weight GB 125/0 5.2 "GB 105/15 16.2" perchlorethylene further rubbed.

Grinding is ended when the grain size is about 5 µm. The solvent content must be between 51% and 52% for processing. When testing this corrosion protection substance in the laboratory and in production it fulfills the requirement of the "Guideline for testing corrosion protection the steel reinforcement of autoclave-hardened gas silicate and gas concrete ", March 1969 edition.

Claims (2)

P a t e n t a n s p r ü c h e 1. Process for the production of a non-flammable anti-corrosion agent for steel reinforcement in lightweight concrete based on a mixture of fillers, Anti-rust pigments, lacquer resins and bitumen, characterized in that a mixture from fillers, anti-rust pigments and paint resins up to 2 ;; Polyvinyl alcohol, up to 3% calcium stearate, up to 2% jettamine, up to 2% butanol and up to 55 ß a chlorinated aliphatic hydrocarbon, preferably perchlorethylene, are fed, these lomponenten ground in a mill and the ground Mix then up to 25% of a mixture of 2 crushed or dissolved Bitumen with various softening points above 100 ° C and up to 25% of the same Solvent are added and rubbed again so that the achieved Grain diameter (grindometer grain fineness) is a maximum of 10 μm, the mass ratio from inorganic solids to organic binders at least 1.0, preferably Should be 1.2. 2. The method according to claim 1, characterized in that all inorganic Solids initially in one with the polar components of the binder mixture Preamp are rubbed.