DD267987A1 - BITUMINOESE MASS WITH HIGH PLASTICITY - Google Patents

Abstract

The invention relates to a bituminoese mass with high plasticity, which is preferably used in construction for roofing with unverrottbarer Traegerbahn on the basis of glass or synthetic fibers, the parameters of the covering mass are selectively varied. The essence of the invention is that the bitumen blend components exhibit a synergistic effect at a suitably defined mixing ratio or that the effect is greater in complex application than the summation of the effects of the individual components. The resistance to aging is substantially improved as a result of the suppression of the mass versification as a result of the exudation of oils. The bituminoese mass can be further improved by finely divided additions of diatomaceous earth, slate, lime, quartz powder, kaolin, rubber powder, asbestos and glass, mineral or synthetic fibers in their mechanical strength and in their elastic behavior.

Description

Field of application of the invention

The invention is mainly applied in the construction industry and relates to a bituminous covering composition, preferably for roof coverings with non-rotatable carrier web on the basis of glass and / or synthetic fibers, wherein the parameters of the covering mass are selectively variable.

Characteristic of the known state of the art

A disadvantage of bituminous masses is the limited plasticity range, ie the temperature range between the heat resistance and the cold resistance of the products. For bitumen and their mixtures, the softening point according to ring and sphere and the breaking point according to Fraas are used. It is up to 7O ⁰ K for distillate bitumen. For blown bitumen, this value is around 100 ° K.

Although so-called waste bitumen have a low breaking point due to additions of mineral and / or tar oils, this also lowers the softening point (DT-OS 196981).

Mixtures of distillate bitumen with polyolefins of ethylene and propylene, but also with ethylene-vinyl acetate copolymers, lead to compounds with low elongation at break and high breaking points (DT-AS 1298282, DT-OS 1469971, DT-OS 1910178, DT-OS 1964212) ,

To improve the breaking point of the mixtures of distillate bitumen and copolymers of ethylene with vinyl acetate polyisobutylene is added according to DT-AS 1301141. These mixtures are difficult to process due to their high viscosity. The plastic temperature range is narrow. Blends of bitumen with atactic polypropylene tend to cream because it dissolves poorly in bitumen. Depending on the degree of distribution of the additive, the mixture becomes more or less gritty on cooling and thus inhomogeneous. The elasticity of these mixtures is low (DT-OS 2043864).

Furthermore, the high required formulation proportions of polyolefins or of copolymers of ethylene are particularly disadvantageous, since in particular the latter are difficult to process because of the low dissolution rate.

The resulting mixtures, depending on the nature of the starting bitumen, tend over time to exude oily constituents, causing embrittlement of the bituminous mass.

Object of the invention

The listed disadvantages of the bitumen mixtures with polyolefins or with copolymers of ethylene can be eliminated or reduced by using highly effective modifiers, possibly as a multi-substance mixture. Of importance is also the minimization of the effective proportions of the modifiers, in particular to simplify the processability. With the help of the design of the multicomponent mixture, the plastic properties of the bituminous mass must be specifically adapted to the respective application requirements.

Explanation of the essence of the invention

The invention is based on the surprising observation that graft polymers of polyvinyl chloride on ethylene-vinyl acetate copolymers lead to a very strong increase in the viscosity of distillate bitumen. The simultaneously occurring disadvantage of increasing the breaking point is eliminated by additions of unsaturated carboxylic acids or their esters with propanetriol, cis-polybutadiene and highly plastic blown bitumen.

It has been found that the bitumen blend components do not provide sufficient effects in a single application. Therefore, it must be assumed that the components exhibit a synergistic effect under suitable mixing conditions, i. H. the effect is greater in complex application than the summation of the effects of the individual components.

The aging resistance is improved because the embrittlement of the mass is greatly suppressed by the exudation of oils. The bituminous mass can be prepared by known finely divided additives such as diatomaceous earth, slate, lime, quartz powder, kaolin, asbestos, glass and mineral fibers, synthetic fibers, rubber powder in their mechanical strength and z.T. be improved in their elastic behavior. Depending on the processing technology, these additives can be used within limits of 2 to 60%.

embodiment

The cover composition according to the invention will be explained in more detail below with reference to five exemplary embodiments:

example 1

Bituminous composition having high plasticity with a softening point according to TGL 21276 100 ⁰ C and a breaking point Fraas, TGL 21276, from -2O ⁰ C, consisting of:

41% distillate bitumen with a penetration according to TGL 21 273 of 180

3% oleic acid techn.

5.3% graft polymer of 15% vinyl chloride on ethylene vinyl acetate copolymer in powder form

26% blown bitumen with a softening point according to TGL 21 274 of 85 and a penetration according to TGL 21 273 of 40 24.7% slate flour

The mixture is prepared at 160 ⁰ C. The mixing time is 4 hours in an intensive mixer. The last two components are scheduled within one hour.

Example 2

High plasticity bitiminous mass with a softening point of 98 ° C and a TGL 21234 flow length of 1 mm at 112.5 ° inclination.

42% distillate bitumen with a penetration according to TGL 21 276 of 200

2% cis polybutadiene

5.5% graft polymer of 14% vinyl chloride on ethylene vinyl acetate copolymer in powder form 30.5% blown bitumen with a softening point of 85 and a penetration according to TGL 21 276 of 40 20% lime The preparation is carried out in analogy to Example 1 at 166 ° C. ,

Example 3

High plasticity bituminous mass with a TGL 21274 softening point of 96 ° C and a Fraas breaking point of <-25 ° C, consisting of:

70% distillate bitumen with a penetration according to TGL 21 273 of 160

2% cis polybutadiene

3% triglyceride of linolenic acid techn.

10% graft polymer of 14% vinyl chloride of ethylene vinyl acetate copolymer in powder form 15% microasbest

The mixture is prepared at 160 ⁰ C. The microasbestos are added after 2.5 h mixing time of the other components in the intensive mixer. After 3 hours, the mixture production is completed.

Example 4

High plasticity bituminous mass with a flow length according to TGL 21 234 at 112.5 ° inclination of 2.5 mm and a Fraas breaking point of -22 ⁰ C, consisting of

37% distillate bitumen with a penetration according to TGL 21 273 of 210

4% oleic acid

6% graft polymer of 15% vinyl chloride of ethylene vinyl acetate copolymer in powder form 35% blown bitumen with a softening point of 85 and a penetration according to TGL 21 273 of 40 18% diatomaceous earth The preparation is carried out in analogy to Example 1 at 169 ° C.

Example 5

High plasticity bituminous mass with a softening point according to TGL 21 274 of 120 ⁰ C and a Fraas breaking point of <-25 ° C, consisting of:

40% distillate bitumen with a penetration according to TGL 21 273 of 260

5% cis-polybutadiene

6.5% graft polymer of 15% vinyl chloride on ethylene vinyl acetate copolymer in powder form 31% blown bitumen with a softening point of 85 and a penetration according to TGL 21 273 of 45 7.5% rubber flour with a particle size of less than 0.25 mm 10% slate flour The Production is carried out in analogy to Example 1 at 170 ⁰ C and a mixing time of 4.5 hours.

Claims (6)

1. Bituminous mass with high plasticity, characterized in that 20 to 75 parts of distillate bitumen having a penetration according to TGL 21 276 of 100 to 400 with 0.5 to 20 parts of unsaturated fatty acids having aliphatic unbranched chains having 15 to 28 carbon atoms, 3 to 12 parts of a graft polymer consisting of vinyl chloride and ethylene-vinyl acetate copolymer with at most 15% vinyl chloride and 0.5 to 30 parts of mineral and / or elastomeric fillers at temperatures below 17O ⁰ C mixed. 2. Bituminous mass with high plasticity according to claim 1, characterized in that up to 50% of the distillate bitumen are substituted by a blown bitumen having a penetration according to TGL 21 276 of at least 40. 3. Bituminous mass with high plasticity according to claim 1 and 2, characterized in that the unsaturated fatty acids by cis-polybutadiene having a viscosity of max. 10 Pa s are completely or partially substituted at 80 ° C in any mass ratio. 4. High plasticity bituminous mass according to claim 1 to 3, characterized in that the unsaturated fatty acids and the cis-polybutadiene are replaced completely or in any mass ratio by esters of unbranched, unsaturated fatty acids of 15 to 30 carbon atoms with propane. 5. Bituminous mass with high plasticity according to claim 1 to 4, characterized in that the elastomeric filler, preferably rubber flour with a sieve residue on the sieve of the mesh size of 0.25 mm of max. 5% is used. 6. Bituminous mass with high plasticity according to claim 1 to 5, characterized in that the mineral fillers are preferably made of slate, lime, microasbest, kieselguhr or inorganic fibers.