DD210919A1 - METHOD FOR MODIFYING BITUMEN WITH RUBBER LATEX - Google Patents

Abstract

The invention relates to a method for Verguetung bitumen with rubber latex. The invention has the goal of finding a cost-effective, based on existing technical equipment, technologically simple method for modifying bitumen with rubber latex. The quality-enhancing effects of the addition of rubber latex to the bitumen should be retained. The object is achieved according to the invention in that the starting material used for the preparation process is a premix consisting of 30% to 50% rubber latex and 70% to 50% of a bitumen-compatible substance, which is readily drenchable below the boiling point of the water and the Breaking point of the bitumen does not increase exists. It has been found that particularly high-boiling oils, for example vacuum distillate or propane resin, or oxidation products of fatty acid production, for example special oxide, are suitable for the purpose of the invention. The bituminum rubbered according to the invention with rubber latex is preferably suitable for the production of anti-corrosion tapes and layers, bituminized sheets for building waterproofing, grouting and roofing.

Description

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a) Title of the invention

Process for modifying bitumen with rubber «latex

b) Field of application of the invention

The invention relates to a method for the compensation of bitumen with rubber, preferably for the production of anticorrosive tapes and layers, structural seals, potting compounds and roof coverings.

c) Characteristics of the known solutions

It is known to treat bitumen with elastomers such as rubber, rubber derivatives or elastic polymers.

Information Source Gundermann, E ·

Principles for the Compensation of Bitumen with Glastomerep Bitumen, Tars, Asphalts, Peche and Related Substances, Heidelberg 21, (1970) 12, pp. 513 to 518, 1 Tab., 26. Mt. There are various methods of incorporation of the rubber or · Rubbers are described · Raw rubber is processed either on mixing rollers or in a kneader ·

93MRI 1983 * 077725

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information:

DE - PS 833 317, Dt "01." 80 b 25/08 "Process for producing elastic roads, floor coverings or wall coverings"

DE - OS 26 46 363, Int. Oll t C 08 L 95/00 "Low-viscosity polymer mixture and its use"

Also practiced is the use of rubber powder which is interspersed in the heated bitumen and mixed. The processing of rubber or old rubber is possible by the same technology, but is considered to be unfavorable in terms of the qualitative effect.

Also known are attempts to dissolve the rubber in organic solvents and to add the bitumen in this form. \

The methods mentioned are characterized either by high technological complexity, difficultly available raw materials or qualitative disadvantages. Particularly good qualitative effects are achieved when using aqueous dispersions of the rubber (Lsticee). The dispersion of the rubber in the bitumen is more complete when using latex than with other processes, so that the same quality-enhancing effects can be achieved with lower rubber use.

The disadvantage is that occur during mixing of the rubber latex with the liquefied bitumen by the evaporation of water foaming and splashing. To avoid clumping of the rubber must be stirred very intensively.

To avoid or reduce these phenomena different possibilities are mentioned.

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Source of information: Esser, H.

Addition of rubber and latex to the esterified masses

Rubber, asbestos, plastics, Stuttgart 1j> (1962) 8, pp. 741 to 751 and, 15, (1962) 10, pp. 979 to 982, 11 Fig. _E , 5 Diagr., 5 Tab., 33 Lit.

These include the use of defoaming agents, technological variants of spraying and the use of special mixing units »These variants are not fully satisfactory in terms of their effect or pose high mechanical requirements. Another method is that the water in the latex is replaced by alcohol "disadvantageous is the associated high economic outlay."

DE - PS 12 20 314, Dt. 01 .: 80 b 25/08 "Bonding and coating compositions for building purposes, based on bituminous substances with a content of rubber in dispersion form, or on fillers, if appropriate" ¹

d) Object of the invention

The invention has the aim of finding a cost-effective, based on existing technical equipment, technologically simple method for modifying bitumen with rubber latex. The quality-enhancing effects of the addition of rubber latex to the bitumen should be retained »

e) Presentation of the essence of the invention

The technical object of the invention is to find a method of mixing bitumen and rubber latex with a suitable composition of the mixture,

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which avoids the disadvantages of the known methods, is inexpensive, manages with the existing technical equipment, is technologically easy to master and provides a high quality end product.

The object is achieved in that the starting material used for the preparation process is a premix consisting of 30 % to 50% rubber latex and 70 % to 50 % of a bitumen-compatible substance, hereinafter referred to as the second component of the premix below the boiling point of the It is found that particularly high-boiling oils, for example vacuum distillate or propane resin, or oxidation products of the fatty acid preparation, for example special oxide, are suitable for the purpose according to the invention as the second component of the premix Manufacturing process is limited to two process steps: 1 «Preparation of the premix 2 · Preparation of the final mixture

The process steps then also take place in the stated sequence.

For the preparation of a premix according to the invention, it is advisable so that the second component of the premix is placed in a heated mixer with a maximum temperature of 95 ⁰ C and the required amount Kautechuk-Iatex with a temperature of 20 ° C to 22 ⁰ C. The premix reaches a temperature of 65 ^° C. at the end of the mixing process. The premix thus obtained is introduced into another heatable stirrer and then to the processing temperature

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of 170 ⁰ C to 220 ⁰ C placed bitumen supplied under slow stirring · The aim is the amount of the added per hour filled bitumen about 15 times amount to 4Ofache the premix · In this way, rubber concentrations reached in the final mixture to 5% · Both the manufacture of the Premixing as well as the final mixture is possible in slow-running stirrers, the speed should be about 60 U / min · When stirring the bitumen into the premix occur only very limited, not disturbing, foaming processes · It form even at very low stirring speed no lumps of rubber · The flexibility of the bitumen is clearly improved by the rubber content of the Kaut «schulc-Latea: and the second component of the premix · When using the substances with higher viscosity, for example propane resin, mentioned for the premix, they are not or only very small Determine reductions in the softening point, since their de softening point lowering effect is compensated by the rubber

f) embodiments

The invention will be explained in more detail below with reference to three exemplary embodiments.

Example 1:

In a vessel equipped with an anchor stirrer speed of 60 min ^"1, a ⁰ to 90 C aufgeheiztem substitute (propane resin) butadiene" styrene latex S 213 is added ·

The ratio of exchange material to rubber latex is 1: 1 to 2: 1, then 300 kg of this

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Pre-mixing a mixer with anchor stirrer given and 4700 kg heated to 200 ⁰ C bitumen GB 85/25 with a flow rate of 6000 kg / h added · It is particularly noteworthy that after the invention Iiösung the processing of blown bitumen is possible under other conditions is very difficult «

The slight foaming takes place at the bottom of the stirred tank and is completed at the completion of the addition of the blown bitumen. "The resulting mixture has a softening point (ring and ball) of 88 ⁰ C and a penetration 24" 10 "" ¹ BHiU The flexibility of corrosion protection bandage produced from this mixture allows the processing below 0 ⁰ C,

Example 2:

A 2 % latex bituminous mixture produced according to Example 1 (Kautechuk content 50 %)

4 % special oxide PO 22 94 % GB 85/25

has a softening point (ring and ball) of 87 ⁰ C and a penetration of 25 "10 mnu The corrosion protection bandage produced from it is characterized by high adhesive strength and flexibility *

Example 3s

Of 50% latex and 50% vacuum distillation at room temperature (20 ⁰ C) is a premix prepared "A portion of this premix are added 24 parts GB 85/25"

The corresponding mixture with high flexibility has a softening point of 78 ^° C. and a penetration of 28 "10" ¹ mm.

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position of bituminised membranes suitable for building waterproofing ·

Claims (3)

- 8 invention claims: 244211 A process for modifying bitumen with rubber latex by feeding the heated bitumen to a rubber-containing masterbatch, characterized in that the masterbatch is 30 % to 50 % rubber latex and 70 % to 50 % high boiling organic compounds below 100 ^° C are good stirrable and do not reduce the cold resistance of the mixture, such as vacuum distillate of the low temperature tuxhydrierung, propane resin, Spezialoxydat the fatty acid preparation or the like contains · 2. The method according to item 1, characterized in that the bitumen is a blown bitumen · Method according to item 1, characterized in that the rubber-containing premix initially charged in the stirring machine is filled with the heated bitumen with slow stirring, the delivery rate of the bitumen per hour being about 15 times to 40 times the amount of the premix.