DD299438A5 - METHOD FOR PRODUCING A CALVULCANICIZING BITUMEN LATEX EMULSION - Google Patents

Abstract

The invention relates to a method for producing a cold vulcanizing bitumen-latex emulsion for use in building protection with application-specific features, such as Keltedehnbarkeit, Waerme- and aging resistance. The preparation is characterized in that 56-62 parts by weight of bitumen having a softening point of 42C are mixed with a liquid phase and, after cooling to room temperature, a new mixture of 77-83 parts by weight of the resulting emulsion with 17-23 Ma . Parts SB rubber latex takes place. 90-91 parts by mass of the resulting bitumen-latex emulsion are added with stirring to 10 parts by mass of a liquid vulcanization accelerator. Furthermore, the mixing is carried out with * parts by weight of sulfur, * parts by weight of zinc oxide, * parts by weight of bentonite and * parts by weight of 2-mercaptobenzothiazole. The resulting mixture is added with * parts by weight of bentonite, the continuous stirring being continued until the homogenization of the emulsion is achieved. {Cold-vulcanizing bitumen-latex emulsion; Architectural coatings; Kaeltedehnbarkeit; Waermebestaendigkeit; Alterungsbestaendigkeit; SB rubber latex; rubber accelerators; homogenization}

Description

Field of application of the invention

The invention relates to bitumen latex emulsion and a method for producing a cold vulcanizing bitumen latex emulsion which makes it possible to rehabilitate damaged roofs, roofs and construction purposes to seal and serves as a protective coating.

Characteristic of the known technical solutions

There are a variety of stable bitumen-latex emulsions, which are mixed with rubber latex, which are used in construction for sealing and roof coating work. Thus DD 77442 and DD 54935 propose solutions which combine the good aging and water resistance of the bitumen with the high elasticity and elasticity of the rubber. A disadvantage of the solutions mentioned is that the cold expansion and recovery behavior and the heat resistance and the aging behavior do not meet the required parameters in practice. As a solution to the realization of the requirements, the Kaltvulkanisation the rubber components via sulfur bridges is known, which is described in the patents DD 247914, DD 258918 and DD 234874.

The indicated solutions DD 247914 and DD 258918 are based on a bitumen base emulsion prepared with clay emulsifiers which already contains the necessary constituents for vulcanizing the rubber latex component (colloidal sulfur and vulcanization accelerator) to be admixed in a second process step.

DD 234874 describes an anionic bitumen emulsion which can be prepared by adding fatty acid, monoethanolamine and a surfactant of bitumen and water in an emulsion mixer.

The vulcanizing agents are added in a third process step, after the rubber latex addition, as part of a separately prepared bentonite kaolin paste. The necessary creamy consistency is realized in DD 247914 and DD 258918 by the addition of metal salts such as copper sulfate.

A disadvantage of the described solutions is that they are very expensive and procedurally complicated and can not meet certain quality requirements.

Object of the invention

The aim of the invention is to develop a process for producing a cost-effective technologically easy to produce cold vulcanizing bitumen latex emulsion, which has good storage and transport properties and optimal application-specific properties due to the wide variability of the components.

Explanation of the essence of the invention

The invention has for its object to provide a method for producing a cost-effective and technologically easy to produce cold vulcanizing bitumen latex emulsion, wherein the bitumen latex emulsion due to the wide variability of the component proportions optimal application-specific properties, such as coolability, resilience after stretching , Heat resistance, aging resistance and adhesion to various substrates and has a good storage and transport resistance. According to the invention the object is achieved in that 5 (H> 2-Ma. parts of bitumen is mixed with a softening point of 42 ⁰ C in an emulsifier with an aqueous phase. Prior to mixing the bitumen at 105-115 ⁰ C and the aqueous are heating phase to 90-95 ⁰ C. After cooling the resulting emulsion to room temperature, a mixture of 77-83Ma. parts of this emulsion with 17-23Ma. parts SB rubber latex emulsion is performed. thereafter, while stirring The bitumen latex emulsion is added with 1.4-1.6Ma parts of the liquid vulcanization accelerator NatriunvDiathyl-Dithiocarbamat (20%), and further dry blended from 0.2-0.3Ma parts sulfur, 0.2 Zinc oxide, O, 8-1.2Ma parts bentonite and 0.2-0.3 parts by mass 2-mercaptobenzothlazole After mixing 5.5-6.5 Ma parts Bentonite is added with constant stirring of this mixture dry bitumen latex emulsion and it produces a brownish, creamy M. aces.

Exemplary embodiment «

In a suitable emulsifier 58.4 parts by weight of bitumen having a softening point of 42 ⁰ C with an aqueous phase consisting of 3.2Ma. Parts of oleic acid, 0.8Ma. Parts of potassium hydroxide and O, 6Ma.-parts oxyethylated Alkylphenol, mixed. Before mixing, the bitumen should be heated to 110 ° C and the aqueous phase to 95 ° C.

The resulting emulsion is characterized by a small particle size of about 1 pm. After the emulsion has cooled to room temperature, it is mixed in the proportion of 80.9 parts by weight of the resulting emulsion with 19.1 parts by weight SB rubber latex. Subsequently, 90.7 parts by weight of the resulting bitumen-latex emulsion with 1.5 parts by weight of the liquid vulcanization accelerator sodium di-ethyl-dithiocarbamate (20%) are added with stirring. The next step is intensive dry mixing of the ingredients

0.25 parts by mass of sulfur

0.25 parts by weight of zinc oxide

1.00Ma. Parts of bentonite (mineral filler) and

0.25 parts by mass of 2-mercaptobenzothiazole.

6.1 parts by mass of bentonite are added to this mixture, and this resulting mixture is added to the bitumen latex emulsion in a dry state. This addition is carried out with constant stirring, which is continued until the emulsion is homogenized. The result is a brownish, creamy mass, which identifies the following properties as dried out film:

- external nature after 9Od outdoor weathering

- Adhesion to concrete 0,24M / mm ³

- Elongation at -5 ° C 200%

- Tensile strength at -5 ^e C O..86 N / mm ²

Heat resistance according to TGL 26884 at 14O ⁰ C.

- Recovery behavior at elongation of 100% 62.5%

Claims (6)

1. A process for the preparation of a cold vulcanizing bitumen latex emulsion, characterized in that 56-62 parts by weight of bitumen having a softening point of 42 ⁰ C are mixed with an aqueous phase and after cooling to room temperature, a new mixture of 77-83 Ma.-parts of the resulting emulsion with 17-23Ma.-parts SB rubber latex takes place and 90-91 parts by weight of the resulting bitumen latex emulsion are 1.4-1.6Ma.-parts of one in water dissolved vulcanization accelerator with about 20% solids added with stirring, and further mixing with 0.2-0.3 parts by weight of sulfur, 0.2-0.3 parts by weight of zinc oxide, 0.8-1, OMa. Parts of bentonite and 0.2-0.3 parts by weight of 2-mercaptobenzothiazole, whereupon 5.5-6.5 parts by weight of bentonite are added to the resulting mixture. 2. A process for the preparation of a cold vulcanizing bitumen latex emulsion according to claim 1, characterized in that an aqueous phase is used which consists of 3.0-3.4 parts by weight of oleic acid, 0.7-0.9 Ma. Parts potassium hydroxide and 0.5-0.7 Ma. Parts of oxyethylated alkylphenol. , 3. A process for the preparation of a kaltvulkanisierenden bitumen latex emulsion according to claim 1 and 2, characterized in that before the mixture, the bitumen to 105-115 ⁰ C and the aqueous phase to 90-95 ⁰ C to heat. 4. A process for the preparation of a cold vulcanizing bitumen latex emulsion according to claim 1 to 3, characterized in that the vulcanization accelerator is dissolved in water and consists of sodium di-ethyl-dithiocarbamate (20% Ig). 5. A process for the preparation of a cold vulcanizing bitumen latex emulsion according to claim 1 to 4, characterized in that the constituents 0.2-0.3 parts by mass of sulfur, 0.2-0.3 parts by mass of zinc oxide, 0.8-1.2 parts by mass of bentonite and 0.2 -0.3 parts by weight of 2-mercaptobenzothiazole are thoroughly dry-mixed and added with 5.5-6.5 parts by weight of bentonite added as a dry mixture of the bitumen latex emulsion. 6. A process for the preparation of a cold vulcanizing bitumen latex emulsion according to claim 1 to 5, characterized in that the addition of the dry mixture with constant stirring, which is continued until the homogenization of the emulsion takes place.