DD295648A5 - GUIDELINES FOR PARTICULAR BITUM MEASURES - Google Patents

Abstract

The invention relates to a lubricant for particular bituminous masses for the purpose of preventing sticking of these masses to surfaces. The aim of the invention is to provide an ecologically and toxicologically completely harmless and cost-effective means that can be used advantageously during transport and during the processing of these same masses, for example in Straszenbau. The object is achieved by modifying oligomerized glycerol with fatty acids by thermal treatment in the weakly acidic p H range. This lubricious agent is mixed with water and fatty alcohol polyglycol ether. The application is carried out by means of spraying onto the surface of the means of transport or the processing machine {lubricant; bituminous masses; Surfaces; oligomerized glycerol; Fatty acid; fatty acid ester; Kettenlaenge; nonionic surfactant; Fettalkoholpolyglykolether; ethylene oxide}

Description

Field of application of the invention

The invention relates to a lubricant for particular bituminous masses for the purpose of preventing sticking of these masses to surfaces.

Field of application of the invention

The invention relates to a lubricant for particular bituminous masses for the purpose of preventing sticking of these masses to surfaces.

Characteristic of the known state of the art

In many places in technology, preparations whose function is to prevent the adhesion of two different substances to their surfaces play an important role.

This adhesion effect has a particularly negative effect in technological steps such as pressing and molding, in the manufacture of moldings of plastics, elastomers, foams, glass, ceramics, metals, concrete, etc.

Also during transport and processing of bitumen-containing materials such. As in road construction, the adhesion leads to significant material losses and unreasonable Arbeitserschwernissen. To prevent this, one uses preparations that are referred to as separating, sliding or formwork depending on their specific purpose.

They all have in common that they contain one or more active components dissolved, dispersed or emulsified. They are usually applied as a film or in a similar form to the surface of the tool before the material is added. But they can also, by virtue of their ability to accumulate on the surface, be added to the material itself.

Special lubricants for bituminous compositions have not been claimed. In practice, however, the use of diesel fuel as a means of preventing sticking of the bituminous masses to metal surfaces is not uncommon. DE-OS 3525255 describes a release agent for concrete in which mineral oil has been conditioned with amine salts, alkali soaps, emulsifiers and sulfite liquor. Other release-active substances are combinations of zinc soaps (oleate or laurate) and a fatty amine (U.S 4897428), a mixture of a fatty acid, a fatty acid ester, uric acid and a uric acid ester in polypropylene glycol (DE-PS 3822162).

Alkyl mercaptan monolayers (U.S. 4,584,156) and organopolysiloxane microemulsions (EP 0254274) have also been described.

Solutions of release-active agents such as waxes, silicones and heavy metal soaps in chlorofluorocarbons (CFCs) claim DE-OS 3335870 and EP 0307832.

All these preparations are multi-substance mixtures containing either mineral oils, heavy metal soaps, chlorinated hydrocarbons, CFCs or other environmentally hazardous substances that may affect the soil, ground or surface water, have human toxicity relevance, or, as in the case of CFCs, as Photooxidantien be made responsible for serious changes in the composition of the earth's atmosphere.

Object of the invention

The aim of the invention is therefore to provide an environmentally and toxicologically completely harmless and cost-effective lubricant for particular bituminous masses.

Explanation of the essence of the invention

The invention has for its object to develop a lubricant for particular bitumen-based masses, which is economical to use and has a high storage stability without segregation and decomposition phenomena in the temperature range of - 15 ° C to +45 "C and over a period of at least 6 months According to the invention, the object is achieved in that

a) 20 to 70 parts by volume of a glycerol oligomerized at pH 3.5 to 5.0, a pressure of 10 to 15 mbar and a temperature of 170 ⁰ C to 175 ° C, which has been modified with a proportion of 25% to a maximum of 50% fatty acids .

b) 25 to 79.9 parts by volume of water and

c) 0.1 to 5 parts by volume of a nonionic surfactant are mixed together.

The product thus obtained is characterized as a dark brown, medium viscosity aromatic fragrant liquid. Component a) herein is the lubricant effective agent, which at the same time, by virtue of its ability to lower the freezing point of the water, gives the product frost resistance down to -15 ° C.

Component b) acts as a solvent for adjusting the viscosity to avoid problems in handling the product, such as

z. As filling, refilling, dosing, etc. to avoid.

Component c) is metered so that bacterial degradation of the active substance is prevented and at the same time remains stable in solution.

The application of the agent is carried out by being discharged at a pressure of at least 300 kPa by means of a sprayer in an amount of about 0.1 l / m ² on the surface of transport or processing equipment for bituminous masses.

Adhesion between surface and bituminous mass is avoided for a period of at least 6 hours.

The lubricant is very readily biodegradable and toxicologically and dermatologically irreversible.

The invention will be explained in more detail in the following 2 embodiments.

embodiments

Embodiment 1

One kilogram of technical grade glycerol and 400 grams of natural fat derived fatty acid containing fatty acids of the total relevant chain length are treated at pH4, 10, 15 to 15, and 17 to 175 ° C for 8 hours.

Originally existing and formed in the reaction of water is separated by distillation.

1 liter of the resulting brown and highly viscous liquid after cooling is mixed with 4 ml of commercial fatty alcohol polyglycol ether having a chain length distribution of C _{) 2} to C ₁₈ and 5 to 10 ethylene oxide groups and 996 ml of water.

The ready-to-use lubricant thus obtained is sprayed by means of compressed air of 30OkPa and a conventional sprayer to metal parts which come into contact with bitumen-containing materials for the purpose of their processing or transport, in an amount of 0.1 l / m *. Adhesion is prevented for at least 6 hours.

Embodiment 2

The lubricant-active ingredient (component a)) according to embodiment 1 is obtained in the following manner: crude glycerol having a glycerol content of 86Ma .-% of a saponification number of 4.4 and a pH of 4.0 at 10 to 15 mbar and 170 ⁰ C to 175 ° C treated.

In this case, 94% of the glycerol, the originally present and the water formed during the reaction are separated by distillation. The lubricant active ingredient remains in the reaction vessel.

Claims (4)

1. Lubricant for particular bituminous masses, characterized in that it a) 20 to 70 parts by volume of a glycerol oligomerized at pH 3.5-5.0, a pressure of 10-15 mbar and a temperature of 170 to 175 ° C, which has been modified with a proportion of 25% to a maximum of 50% fatty acids, b) contains 25 to 79.9 parts by volume of a nonionic surfactant: 2. Lubricant according to claim 1, characterized in that the required fatty acids are obtained from animal and / or vegetable raw materials. 3. Lubricant according to claim 1 and 2, characterized in that the fatty acids are at least partially esterified with the oligomerized glycerol. 4. A lubricant according to claim 1, characterized in that it contains as nonionic surfactant fatty alcohol polyglycol having chain lengths of C ₁₂ to C ₁₈ and 5 to 10 ethylene oxide groups.