DD152801A1 - PROCESS FOR PRODUCING HIGH QUALITY PURPOSES - Google Patents

Abstract

The invention relates to a method for producing asbestos-free Verguszstoffe, which can be used in particular as Fugenvergussmassen for cement-bound Straßenverkehrsflächen. According to the invention, 1.5 to 2.5 parts by weight of polyethylene in 40 to 50 parts of bitumen at temperatures of 150 degrees C to 230 degrees C, preferably at 200 to 220 degrees C, dissolved and then to a minimum of 150 degrees C falling temperature 7.5 bis 12 parts of groundwood and 35 to 45 parts of mineral fillers added and homogenized. To improve the elongation, 0.1 to 0.2% by weight of glass fiber staples of length> 10 mm can be added.

Description

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Process for the production of high quality potting compounds Field of application of the invention

The invention relates to a process for the production of high-polluting asbestos-free potting compounds, which can be used in particular as Fugenvergußmassen for cement-bound road traffic surfaces.

Characteristic of the known technical solutions

Grout fillers are products that fill the gaps between building materials in such a way that the joints remain closed under all physical conditions and above all the penetration of moisture is prevented. They must be stretchable within certain limits and must not break even at low temperatures, which cause an enlargement of the joint width.

Further essential utility criteria are the high elasticity against dynamically occurring stress at low temperatures and a high thermal stability, which prevents spillage of the potting compound during the warm season.

Potting compounds are made by mixing bitumen with fillers. When using potting compounds as joint potting compound, especially in cement-bound road traffic surfaces, such fillers are used, which cause by their fibriogene structure, a cross-linking of the mixture and thus a high resistance to static and dynamic forces «

Thus, the quality of potting compounds can be improved by additions of asbestos meals or fibers so that they meet the o. G "demands on the use value.

Due to the high toxicity of asbestos stringent requirements to guarantee freedom from dust placed on dia mechanical equipment of Bautenschutzbetriebe or _o the scale of production of such asbestgefüliter grouts for industrial hygiene reasons is limited.

There has therefore been no lack of attempts to produce high quality potting compounds from combinations of bitumen and plastics and without the addition of mineral fillers.

According to DE-OS 2,842,146 casting compounds are known which consist of mixtures of bitumen, solubilizers and 25 % atactic polypropylene.

In DE-OS 2 163 491 potting compounds are described which contain up to 80 % polyethylene. The plastic content of the potting compound shown in DD-WP 50 918, which consists of polyethylene and / or polyisobutene and 20 % of extraction bitumen, is similarly high.

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These potting compounds are characterized by a very good ductility in the cold, but have the disadvantage that an economically viable application is not given by the high content of plastics.

This applies equally to such casting compounds in which, although fillers are included, the proportion of plastics in additions of more than 10 wt .-% is.

According to US Pat. No. 3,179,610, additions of up to 25% polyurethane are carried out, the polymerization taking place during the production of the potting compound »

In DE-AS 1 301 141 is provided as a binder, a mixture of bitumen with 20 to 70 % copolymer of ethylene / vinyl acetate and methacrylates and up to 30 % polyisobutene

Similarly, the proportion of polyethylene or polypropylene of the grout described in DE-OS 1,932,538 is.

The use of rubber powder to modify bitumen is described in the literature. According to Vajta et al. (Bitumen, Tars, Asphalts, Peche, No. 9/1962, pages 429-433), a clear plasticizing effect of bitumen occurs with additions of 8-10 / 0 rubber flour, whereby a very complex mixing process up to the homogenization of the Mixture is necessary «,

Analogous results also scored Gundermann (bitumen, tars, asphalts, pitches;. No. 7/1966, pages 250-254) in the investigation of the effect of crumb rubber on bitumen extraction.

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In these and similar investigations it was assumed to achieve a largely homogeneous mixture of bitumen and rubber powder, which can be used as a binder in road construction. Due to the relatively high thermal load, a partial degradation of the Gurnmimehles, whereby the maximum of the plasticizing effect of the waste rubber in the phase of its swelling has already been exceeded.

In DE-OS 2,105,779 the use of vulcanization accelerators in the production of rubber-filled potting materials is recommended in order to obtain the plasticizing effect of the waste rubber.

The important for a good Vergußstoff stretchability in the cold, however, was achieved only by the use of asbestos.

Object of the invention

It is an object of the invention to produce a high-quality grout for cement-bonded road traffic surfaces based on mixtures of road bitumen, fillers and finishing additives, wherein the use of asbestos is excluded.

Explanation of the essence of the invention

The invention has for its object to unite the improved by the use of polyolefins cold flexibility and achieved by using rubber powder plasticization of bituminous binders by combining bitumen, polyolefins, rubber powder and fillers so that a high-quality asbestos-free joint casting is achieved.

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According to the invention the object is achieved in that 1.5 to 2.5 parts by weight of polyethylene in 40 to 50 parts of bitumen at temperatures of 150 ⁰ C to 230 ⁰ C, preferably at 200 ⁰ C to 220 ⁰ C, and then dissolved at falling temperatures up to a minimum of 150 C 7.5 to 12 parts of gum meal and 35 to 45 parts of mineral fillers such as slate flour, stone meal and the like Ä. Be added.

By additions of 0.1 to 0.2 parts by weight of glass fiber <10 mm, a further qualitative improvement of the potting compound, in particular its thermal stability and the Kältedehnbsrkeit be achieved.

The production of the Vergussstoffes carried out according to the usual mixing technology in stirrers, the mixing times are for the plastic 1.0 to 1.5 hours, for the fillers 0.5 hours.

Compared to the filler-free bitumen-plastic combinations and filled with minerals and a plastic content of more than 10 % containing bitumen plastic «combinations, the casting compound according to the invention is better in terms of quality, less expensive and therefore more economical.

An application of the harmful asbestos material is excluded.

Anwendung3beispieIe

The solution according to the invention will be explained in more detail with reference to the following examples:

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4 % of polyethylene were dissolved in a stirred tank at a temperature of 210 ° C. in a bitumen of penetration B 200 and then worked up to a minimum of 150 ^° C. falling temperature of stone powder, rubber powder and, if appropriate, glass fiber stacks.

The influence of the additives on the quality characteristics of the potting compound is shown in the following table.

Sample 12 3 4 5

composition

- Bitumen B 200 % 50.0 48.0 48.0 48.0 48.0

- Rock flour % '50 .0 50.0 45.0 41.0 40.9

- Rubber dust % 5.0 9.0 9.0

- Polyethylene % - 2.0 2.0 2.0 2.0

Glass fiber stack % - - - - - 0.1

quality test methods

Heat resistance:

deformation value

to Nüssel 24 hours 12,0 8,5 4,5 3,8 2,0

Cold resistance:

Ball drop height

according to TGL 141015

at - 10 ⁰ C m 2.5 2.5 4.0 5.0 5.0

Stretching after

Raab © at - 10 ⁰ C mm 1,5 3,2 3,9 5,2 6,0

Claims (1)

invention claim Process for the production of high quality potting compounds, characterized in that 1.5 to 2.5 parts by weight of polyethylene in 40 to 50 parts of bitumen at temperatures of
150 ⁰ C to 230 ° C _t preferably at 200 ⁰ C to 220 ⁰ C, ge "are loose and thereafter at decreasing temperatures to a minimum of 150 ° C _f 7 _f 5 to 12 parts of powdered rubber and 35 to 45
Parts of mineral fillers such as slate flour, stone meal u. _o homogeneously mixed in «, 2c method according to point I _x characterized in that the
Mixture of 0.1 to 0.2% by weight glass fiber stacks with a grain size of <10 mm are added.