DD289077A5 - BITUMINOESER BUILDING PROTECTIVE - Google Patents

Abstract

The invention relates to a bituminoesen Bautenschutzstoff of polymer modified bitumen, organic solvents and optionally with a Fuellstoffanteil for paints, coatings and adhesives. For bituminoesen Bautenschutzstoff as bituminoeses binder a polymer-modified bitumen is used, which consists of 78 to 98 parts by weight of bitumen, 1.8 to 20 parts by mass of polybutadienes and 0.2 to 2.0 parts by mass of sulfur by stirring at 160 to 230C for up to 8 hours. {Bituminous building preservative; polymer modified bitumen; organic solvents; Sulfur; polybutadienes}

Description

Field of application of the invention

The invention relates to a bituminous Bautenschutzstoff of polymer modified bitumen, organic solvents and optionally with a filler content for paints, coatings and adhesives.

Characteristic of the known state of the art

Bitumen solutions are known for the purpose of sealing hot bitumen based building blocks, bitumen emulsions and solvent bitumen. They are preferably used as care and renovation coatings for roofs, for the protection of concrete and masonry, as a corrosion school coating for metals, especially steel and for the protection of vehicle underbody but also as a cold adhesive for a variety of materials.

These paint and cold adhesives have some properties that limit their use in building protection for certain applications, such. B. their pronounced thermoplasticity and, consequently, the tendency to flow, the brittleness, too small crack bridging and a different behavior to weathering.

It is also known that bitumen can be considerably quenched by combining with polymers. The elastomers transfer their typical features to the bitumen and thus results in a shift from predominantly plastic to a predominantly elastic state. The addition of polymeric substances to bitumen has been published in numerous papers and patents. It is also possible that combinations of bitumen and elastomers in the dissolved state are used as cold adhesives for bonding heat-sensitive materials, but also of geomembranes based on bituminous or high polymers.

Crosslinkable plastics are often well absorbed by the bitumen and show a positive effect, but a crosslinking ζ. ß. vulcanization leads to disruptions in the structure of the structure and associated inhomogeneity. An already crosslinked with sulfur bitumen-elastomer combination, which is then immediately brought into solution, is not known in the prior art.

Object of the invention

The aim of the invention is to find a bituminous Bautenschutzstoff with high performance properties, as versatile as possible for protective coatings, roof coatings and as a cold and adhesive Adhesive.

Explanation of the essence of the invention

The invention has for its object to develop a bituminous Bautenschutzstoff of polymer modified bitumen, organic solvents and optionally with a Fümöstoffanteil.

According to the invention the object is achieved by a bituminous Bautenschutzstoff of organic solvents and a polymer-modified bitumen, consisting of 78 to 98 parts by weight of bitumen with softening points of 35 "C to 72 ⁰ C and resin contents of at least 25 parts by mass in%, 1 , 8 to 20 parts by mass of polybutadienes having numerical molecular weights of 2,000 to 10,000, iodine numbers of 350 to 450 g J / 100 g and viscosities at 20 ° C of 1 to 250 Pa · s and 0.2 to 2 parts by mass of sulfur while stirring at 16O ⁰ C to 23O ° C is obtained up to 8 hours.

According to a further feature of the invention, up to 50 parts by mass in% of the bitumen fraction can be replaced by resin-rich hydrocarbon mixtures of petroleum processing and / or pitches or tars of processing of lignite and lignite.

The polymer-modified bitumen with crosslinked rubber fractions obtained according to this procedure have advantageous rubber-elastic properties, such as high elasticity even at temperatures below freezing point and high resilience. Due to the partially remaining short-chain content of these bitumen are very sticky and therefore have excellent adhesion to substrates of various kinds. By replacing a part of the

Bitumens by resin-rich hydrocarbons, such as heavy vacuum distillates of Erdölverai processing or pitches or tars of stone and lignite processing can eich the properties mentioned improve or modify the desired nature.

Surprisingly, no inhomogeneity of the mixture occurs on addition of the organic solvents to the polymer-modified binder thus obtained. In this case, it is possible to proceed in such a way that the polymer-modified bitumen obtained according to the invention is immediately dissolved in organic solvents, optionally with the addition of a filler fraction, following its preparation.

A bituminous building protection material produced in this way can be used for protective coatings for roofs, concrete and masonry as well as for anti-corrosion purposes on metallic substrates. After evaporation of the solvents, the positive desired plastic and rubber-elastic properties are obtained immediately. When the composition is varied, such higher viscosity solutions of this type can also be used for coatings of roofs or as cold adhesives for heat-sensitive building materials and for bituminous or polymer-based geomembranes.

Ausführungsbeltplele

1. From 89.3 parts by mass of a bitumen, with a softening point of 45 ⁰ C and a resin content of 35 parts by mass in%, which is determined by elution of the molten phase by column chromatography on aluminum oxide using acetone-toluene mixtures, 10 Ma.-parts of a polybutadiene having a numerical molecular weight of 8,000, an iodine value of 380g J / 100g and a viscosity at 20X of 180Pa · s and 0.7 parts by mole of sulfur is polymer-modified with stirring at 190 ° C for 3 hours Bitumen with a softening point of 60 "C, a penetration of 113 10"'mm, a breaking point of -15 ⁰ C, a ductility of over 100cm and a recovery of 85% received, which was then immediately with a share of 55 Ma. Divide in% white spirit at a temperature of 13O ⁰ C is dissolved.

The film-forming ingredients of the paint have the following properties: pliability to the 4mm-rod: bis 15 ⁰ C Reißdehnungbei-15 "C: 145%

Heat resistance: up to 90 ⁰ C

2. 100 parts by mass of the binder prepared according to Example 1 are mixed with 20 parts by mass of a solvent mixture of equal parts of white spirit and methylene chloride. The resulting viscous solution is used as an adhesive cold adhesive.

The adhesive has the following properties: Tensile strength of the bonding Bitumen roofing foam polystyrene after 4 hours 50kN / m ²

after 48 hours 95kN / m ²

3. The following feedstocks are used to produce the bituminous binder for the solvent paint: bitumen softening point resin content

R u. K ⁰ C

A 48 B 59 C 70 polybutadiene numerical molecular weight 40 45 48 Jocfzahl gJ / 100g Viscosity at 20 ° C Pa s Resin content% I Il III hydrocarbon mixture 2050 440 7 500 390 9800 200 softening point R u. K ⁰ C 1.2 200 248 pour point • c 30 33 28 1 vacuum distillate d. Oil refining 2 Coal tar pitch 3 Brown coal low temperature tar 42 25 18

From these raw materials bituminöso binders for solvent-based building preservatives are prepared according to the following reaction conditions:

binder 1 2.0 2 0.8 3 2 - 0.2 4 5 1.0 6 1.5 7 8th - Einsaustoffe 220 200 225 185 170 Ma.-Toile 3 0.5 - 8th 3 2.5 - BitumenA 78 88 98 - - 72 _ Bitumen B _ _ _ - 80 - _ 46 46 Bitumen C _ _ - - 63 - - 1.0 Polybutadiene I 20 - - - - 1G - 190 Polybutadiene II - 12 - 10 15 - - 3 Polybutadiene III - - - - - Hydrocarbon mixture 1 - - 10 21 - Hydrocarbon mix 2 - - - - 10 Hydrocarbon mix 3 - - - - - sulfur 0.7 Mixing temperature ⁰ C 180 Mixing time h 2

From the bituminous binders produced, bituminous paints having the stated properties are prepared according to the following formulations:

bitumen coating 1 2 - 3 4 G 6 6 7 7 No. 1 2 3 4 5 Binder Ma, parts 147 52 54 in% 59 63 56 52 53 48 31 White spirit in% 41 31 33 22 18 _ 15 o-dichlorobenzene in% _ 6 90 11 _ 8th _ _ Limestone flour in% - - 26 21 elongation at break 141 138 at -15 ° C% 126 106 74 65 recovery 78 after 100% 105 89 90 Strain % 81 84 76 74 Tensile strength of Bonding roof bahn-SPSnach _ _ 24hkN / m * 75 _ 80 - nach48hkN / m ' 96 100 _

Claims (2)

1. Bituminösanten Bantenschutzstoff of polymer modified bitumen, organic solvents and optionally with a filler content, characterized in that a polymer-modified bitumen is used as the bituminous binder consisting of 78 to 98 parts by weight of bitumen with softening points of 35 ⁰ C to 72 ° C and resin contents of at least 25 parts in Ma.%, 1.8 to 20 parts Ma. polybutadienes having numerical molecular weight 2000-10000, iodine numbers of from 350 to 450g J / 100g and viscosities at 2O ⁰ C of 1 to 250 Pa · s and 0.2 to 2.0 Ma. Teiien sulfur is obtained by stirring at 16O ⁰ C to 230 ⁰ C up to 8 hours. 2. Bituminous Bautenschutzstoff according to claim 1, characterized in that in the polymer-modified bitumen up to 50 parts by mass in the proportion of bitumen resinous hydrocarbon mixtures such as heavy vacuum distillates and or or residues of petroleum processing and or or pitches or tars of stone and Lignite processing individually or in mixture.