CS240949B1 - Rubber dust rubber compound for the production of waterproofing membranes - Google Patents

Abstract

Rubber mixture based on rubber dust for the production of waterproofing membranes used in construction, characterized in that per 100 parts by weight of butadiene-styrene rubber in a mixture with regenerated rubber or their mixture with polyisoprene rubber it contains 3θ and 200 parts by weight of carbon black, 30 to 150 parts by weight of inorganic fillers, 5 to 5θ parts by weight of oxidized asphalt, 1 to 15 parts by weight of mineral oil and 0.5 to 3 parts by weight of phenyl-/$ -naphthylamine. The rubber mixture may contain 1 to 10 parts by weight of short fibrous fillers based on cellulose or glass.

Description

(54) Rubber powder-based rubber compound for the production of waterproofing membranes

A rubber compound based on rubber dust for the production of waterproofing membranes used in construction, characterized in that per 100 wt. parts of butadiene styrene rubber mixed with regenerated rubber or a mixture thereof with polyisoprene rubber contains 3θ and 200 wt. % of carbon black, 30 to 150 wt. parts of inorganic fillers, 5 to 5 wt. parts of oxidized asphalt, 1 to 15 wt. parts of mineral oil and 0.5 to 3 wt. parts of phenyl - N - naphthylamine.

The rubber composition may contain 1 to 10 wt. parts of short fibrous fillers based on cellulose or glass.

240 949

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The present invention relates to a rubber / dust-based rubber composition suitable for the production of waterproofing membranes for use in the construction industry.

Produced waterproofing foil materials Oa. The rubber base can be divided into two qualitative groups. First of all, they are rubber vulcanized foils made on the basis of synthetic rubbers with a high degree of saturation such as EPDM, IIR,

CR. A disadvantage of these types of films / besides the high energy demand for the thermal energy required for vulcanization, is their difficulty in shaping to complex details due to the high elasticity and toughness of the vulcanisate. The foils are also characterized by low dimensional stability, which is manifested after shrinkage application, the foils are also difficult to lay on and between the substrate, the joints need to be secured with adhesive tapes.

The second product group are rubber-based foil materials produced without the vulcanization process. These may be, for example, · materials according to U.S. Pat.

U.S. Pat. No. 4,031,169 based on the composition of unvulcanized EPDM and polyolefin blends. Films made from these blends are characterized by high toughness and difficult processability, and are also difficult to bond due to the polyolefinic component.

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Another type of waterproofing unvulcanized fo varies ^from are e.g. films made based on polyisobutylene or ohlorsulfonovaného polyethylene. Due to the low mechanical strength of the rubber compounds and in order to increase the dimensional stability, the foils are provided with a textile lining or a non-woven fabric on the reverse side. The disadvantage of these types of foils is that after a long exploataoi, the woodworker or dirt separates the textile reinforcement from the foil and thereby loses the waterproofing function.

GB 1 315 968 and GB 1 400 145 disclose a composition of an unvulcanized EPDM-based waterproofing membrane, asphalt having a relatively low softening point of 60 ° C · exhibiting lower resistance to mechanical damage at temperatures above 30 ° C.

Waterproofing foil, for example according to MS. AO 182 416, produced on the basis of regenerate, partially regenerated rubber and other additives | are characterized by good formability, disadvantage is considerable dimensional changes P ° exposure to weather caused by migration of high content of regenerative oils contained in regenerate and pieces of rubber, which results in low film integrity (cracking and hole formation due to particles being crumbled).

These drawbacks are overcome by the object of the invention, which is a rubber compound based on rubber dust for the production of waterproofing membranes, characterized in that per 100 wt. parts of butadiene styrene rubber in admixture with regenerated rubber or mixtures thereof with polyisoprene rubber contain 30-200 wt. parts of rubber dust, 30 s 100 wt. parts of carbon black, 30-150 wt. parts of inorganic fillers, 5-50 wt. parts of oxidized asphalt, 1-15 wt. parts of mineral oil and 0.5-3 wt. The rubber composition may contain 1 to 10 parts by weight of short fibrous fillers based on cellulose, plastic or glass.

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The present invention provides a rubber composition for waterproofing films; the rubber component consists of butadiene styrene rubber mixed with the regenerator, the high elasticity and flexibility of the foil is provided by fine rubber dust with a particle size of up to 0.5 mm (eg as abrasion when grinding rubber rollers).

The fineness of the rubber dust positively affects the integrity of the film, and has a favorable effect on the resistance of the film to weathering.

Compositions containing a higher content of rubber dust are characterized by poor processability, the film tears during rolling and does not adhere to the rollers. The addition of the regenerate to the rubber powder rubber compositions to achieve a certain initial mechanical strength and self-support of the film is sufficient to handle the film during storage and application so as to prevent mechanical damage to the film.

The addition of asphalt serves as a binder of the mixture, also secures and increases the ability to bond the film to the substrate; owing to the desired film properties, oxidized asphalt types with a softening point above 60 ° C are suitable. The content of reinforcing soot and white fillers is important in the mixture, the optimum ratio of these fillers in t ensures good foil workability and weathering resistance. Addition of mineral oils, natural or synthetic resins or polyisoprene rubber is suitable for improving processing properties and tackiness.

Materials with good weathering resistance can be prepared, the foil resistance can be increased by adding a suitable type of antioxidant, e.g. phenolic substances, phosphites etc.

Higher creep resistance and achievement High dimensional stability can be achieved by adding fibrous fillers, e.g. cellulose fibers, plastic fibers, glass fibers, etc.

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The foils can be easily shaped into various details, they can be easily glued to the substrate and with each other chlorine-based adhesives, asphalt rubber, hot asphalt, etc. · The foils are usable in the temperature range from -20 ° to + 70 ° C. The preparation of the mixture and the theology of the production of the film are simple, it consists in mixing the mixture in a kneading machine and rolling on a three-roll, the vulcanization is eliminated. The waterproofing films according to the invention have a weather resistance.

EXAMPLE 1

It is a formulation of a reoeptux mixture for a waterproofing membrane with high dimensional stability. The mixture was mixed in a high-pressure kneading machine, a 2 mm thick film was rolled from the mixture, from which the test bodies were punched and the basic physical-mechanical values were determined.

butadiene styrene rubber wt. parts 50 regenerated rubber 30 rubber dust 100 ALIGN! Polyisoprene rubber 20 May soot 30 kaolin 100 ALIGN! oxidized asphalt 8 phenyl- N-naphtha laminate 1.5 short cellulose threads 3 mineral oil 1

Claims (2)

Object of the invention 240 949 1. A rubber compound based on rubber dust for the production of waterproofing membranes characterized by t / m that per 100 wt. parts of butadiene styrene rubber in the β-regenerated rubber mixture or mixtures thereof with polyisoprene rubber contain 30 to 200 wt. 30 to 100 wt. % of carbon black, 30 to 150 wt. parts of inorganic fillers, 5 to 50 wt. parts of oxidized asphalt, 1 to 15 wt. parts of mineral oil and 0.5 to 3 wt. parts of phenyl- [1-naphthylamine]. 2. Rubber composition according to claim 1, characterized in that it contains from 1 to 10 wt. parts of short fibrous fillers based on oeluloey, plastic or glass.