DK166032B - BITUMEN COATS, PRESENTLY ELASTICALLY MODIFIED BITUMEN COATS AND POLYMERBITUM COATS - Google Patents

Abstract

The bituminous webs are characterised in that the impregnating and/or covering bitumen material used in their production contains a proportion of synthetic silica. The synthetic silica can be precipitated or pyrogenic silica.

Description

in

DK 166032 B

The present invention relates to bitumen webs, preferably elastically modified bitumen webs and polymer bitumen webs.

Bitumen webs are according to DIN 55 946 webs with 5 carrier inserts, e.g. blanket, fiberglass blanket or tissue, jute fabric, chemofibre blanket or tissue, which may be either impregnated with bitumen impregnation pulp or further on both sides may be provided with bituminous pulp coatings and sprinkled with mineral substances.

10 According to DIN 55 946, the bitumen itself is a heavy, volatile, dark-colored mixture of various organic substances obtained by working up suitable petroleum, whose elastoviscose behavior changes with temperature. The bitumen-typical properties are based on a colloidal system in which a phase (asphaltenes and petroleum resins) exists in stable distribution in a continuous (coherent) phase of high boiling oils (maltes). The asphaltenes and petroleum resins are not a uniform group of substances. They are the high molecular weight constituents of the bitumen and can be separated by suitable solvent.

For bitumen in the wider sense, the bi-tumenous constituents of natural asphalt from geological oils must also be counted in geological time.

25 Such bitumen is referred to as asphalt within the Anglo-Saxon language area (especially the United States).

According to DIN 55 946 bitumen differs from asphalt. Thus, asphalt is a naturally occurring or technically produced mixture of bitumen or bitumen-containing binder and minerals as well as any additional additives and / or additives.

It is known to produce bitumen blends for the roofing industry which, in addition to the bitumen, contain sulfonated polymers and fillers 35 (cf. U.S. Patent No. 4,371,641). Such bitumen mixtures have the disadvantage that the content of polymer sulphonates partly leads to an increase in the water vapor passage capacity and partly reduces the elasticity capacity.

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The present invention relates to bitumen webs which are characterized in that the bitumen impregnating mass used in their manufacture has a content of synthetic silicic acid of 0.5-3.0% by weight based on the 5 bitumen impregnating mass, and / or the bitumen pulp used for their preparation has a content of synthetic silicic acid of 0.5-5.0% by weight based on the bitumen pulp.

Bitumen web is understood to mean a bitumen web, as defined in DIN 55 946.

The bitumen webs in question are preferably elastically modified bitumen webs or polymer bitumen webs. These may correspond to DIN standards DIN 52 133 (polymer bitumen welding web), 52 128, 52 143, 52 130, 15 52 131, 52 132 and / or 18 190.

As synthetic silicic acid, both precipitated and pyrogenic can be used, especially in the silicic acid produced by the flamrae hydrolysis method.

The precipitated silicic acid may exhibit a BET surface area of 120-500 m / g. It may optionally be steam jet milled, spray dried or spray dried and ground. Preferably, a spray-dried and ground precipitated silica is used.

The pyrogenic, preferably flame hydrolytic silicic acid can exhibit a BET surface of 100 to 400 m 2 / g.

The bitumen impregnating mass may, in addition to the synthetic silicic acid used according to the invention, preferably have the following components: Bitumen, preferably distillation bitumen such as B 300, B 200 and / or B 80 in an amount of 53-70% by weight based on the total mass.

Elasticity enhancer, preferably SBS, and / or EPDM rubber, in an amount of 2-15% by weight based on the total mass.

Optionally, the bitumen impregnating mass may contain additional substances such as fillers. fill

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3 substances, such as shale flour, limestone flour, fly ash, etc., are mineral, finely ground substances that are not soluble in water. The content of fillers can be from 0.1 to 15% by weight based on the total mass.

In addition to the silicic acid used according to the invention, the bitumen pulp may preferably comprise the following components:

Bitumen such as oxidation bitumen or distillation bitumen, preferably distillation bitumen, TO e.g. of type B 300, B 200 and / or B 80 in an amount of 50-70% by weight based on the total mass.

Elasticity enhancer, preferably SBS and / or EPDM rubber, regenerated rubber, softening oil, in an amount of 3-15% by weight based on the total mass.

Optionally, the bitumen cover may contain additional substances such as filler. Fillers, such as shale flour, limestone flour, fly ash, etc., are mineral, finely ground substances that are not soluble in water. The bitumen decking mass may contain additional reinforcing materials such as glass fibers, mineral fibers, steel fibers, plastics fibers and / or cellulose fibers.

The filler content may be from 0.1 to 30% by weight based on the total mass.

The bitumen webs in question may, in known manner, be sprinkled with shale gravel, talc, greenstone and / or quartz sand.

Known fabrics can be used as inserts for the preparation of the subject bitumen webs, known as fabrics such as glass fabric, glass fiber blanket, polyester fiber blanket, polyester film according to DIN standards 18 190, 52 130 to 52 133. ", 5th edition, 1976, page 94,

Bauverlag GmbH.

The preparation of the subject bitumen webs can be carried out by known methods. For example, the preparation can be carried out as described in public 4

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"bitumen and asphalt taschenbuch", 5th edition, 1976, page 96 et seq., Bauverlag GmbH.

The bitumen webs in question have the advantage that the plasticity span is considerably expanded.

That is, the temperature difference between cold-bending stability and heat resistance, which difference between the respective webs is determined according to DIN 52 123, part 2, is clearly increased by the use of synthetic: silicic acid. Thus, the heat resistance can be increased to 120 ° C. By the addition of synthetic silicic acid, a considerable saving of known elasticity-enhancing substances such as SBS rubber can be achieved.

Danish Patent Application No. 0695/86 and British Patent Specification No. 941,965 disclose roofing webs containing silica, but in greater quantities than according to the present invention, whereby the above-mentioned extension of the plasticity span is not achieved.

The disclosed bitumen webs can be used as 20 bitumen roofing webs, bitumen roofing webs, vapor barrier webs, bitumen welding webs and / or as sub-span webs for brick and asbestos cement roofs.

The invention is further described by the following examples; 25 Examples

The following provisions have been made on the bitumen web according to DIN 52 123, part 2: a) Heat resistance.

b) Cold bending stability.

^ At the bitumen tire mass, the softening point is determined by "Ring und Kugel Test" according to DIN 52 011.

The preparation of the individual bitumen webs has been carried out according to "bitumen und asphalt taschenbuch", 35

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5 5th edition (1976), pages 96-98, where oxidation bitumen 85/40 is used as bitumen impregnation mass.

Example 1

A polymer bitumen tire compound having the following composition was used:

66% Bitumen B 200 E

10% Rubber SBS 411 Powder (s) 2% Fuming Silica Sipernate 22 S 2% Mineral Fiber 10 20% Slate Flour

Stirring time: 5.5 hours

Temperature: 18 ° C

Ring and ball value: 135 ° C

Heat resistance: 2 hours / 120 ° C, passed 15 _ Cold stability: -31 ° C passed

Plasticity stressed: 135 ° C + 31 ° C = 166 ° C

Example 2 (Polymer Bitumen Cover Mass) 68% Bitumen B 200 E 20 10% Rubber SBS 411 Powder 2% Mineral Fiber 20% Slate Flour

Stirring time: 4.5 hours

Temperature: 180 ° C

Ring and ball value: 126 ° C

Heat resistance: 2 hours / 100 ° C not passed

Cold stability: -29 ° C passed

Plasticity stressed: 126 ° C + 29 ° C = 155 ° C

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Example 3 (Rubber Bitumen Cover) 75.8% Oxidation Bitumen 85/40 2.6% Aromatic Softening Oil 5 3.5% Rubber Milk (particle size 0.3 to 0.6 mm)

3.0% Fuming silica Sipernat 22 S

15.2% slate flour

Stirring time: 24 hours

Temperature: 180 ° C

Ring and ball value: 116 ° C

Heat resistance: 2 hours / 70 ° C, passed

Cold stability: -8 ° C ·

Plasticity spread: 116 ° C + 8 ° C = 124 ° C

Example 4 15 '(Rubber-Bitumen Cover) 78.8% Oxidation Bitumen 85/40 2.6% Aromatic Softening Oil 3.5% Rubber Flour (Particle Size 0.3 to 0.6 mm) 15.2% Shale Flour 20 Stirring Time: 22 hours

Temperature: 18 ° C

Ring and ball value: 1 07 ° C

Heat resistance: 2 hours / 70 ° C / 'non-passed

Cold stability: -6 ° C

25 Plasticity stressed: 107 ° C + 6 ° C = 113 ° C

In Examples 1 and 2 and 3 and 4 respectively, the same starting materials are used. The precipitated silicic acid used Sipernat 22 S is a spray-dried and ground precipitated silicic acid with the following physico-chemical identification data:

Claims (5)

5 Sieve residue (according to Mocker 45 µm)% 0.1 Loss of drying (2 hours, 105 ° C) ^% 6 Glow loss (2 hours, 1000 ° C)% 5 SiO .. 7)% 98 7) Na 2 O% 1 10 Fe -O, 7)% 0.03 ^ j 7) SO3 1% 0; 8 1. According to DIN 66 131 2. According to DIN 53 194 (not charged) ISO 787 / XI or JIS K 5101/18 15 3) According to DIN 53 200 (in 5% aqueous dispersion), ISO 787 / XI, ASTM D 1208 or JIS K 5101/24 4. According to DIN 53 580, ISO 787 XVIII or JIS K 5101/20 5. According to DIN 55 921, ASTM D 1208 or JIS K 5101/23 6. based on the 2 hours at 105 ° C dried substance 20 7) based on the 2 hours at 1000 ° C glowing substance. Bitumen webs, characterized in that the bitumen impregnating mass used in the bitumen impregnating mass has a content of 0.5-3.0% by weight of synthetic silica based on the bitumen impregnating mass and / or the material used in their preparation. bi-tire pulp has a content of synthetic silicic acid 30 of 0.5-5.0% by weight based on the bitumen tire mass.