DE2105779C3 - Process for the production of joint sealing compounds - Google Patents

Description

example

6300 kg bitumen and 1600 kg rubber powder are stirred together with 20 kg zinc thiophenolal at 210 ° C. While the softening point (ring and ball method, DIN 1996) of the mixture is initially above 100 ° C. and cannot be precisely determined because the mixture is inhomogeneous and not sufficiently flowable, a softening point is found after a stirring time of two hours from 100 C and after 2 _1/2 hours from 90 C. 700 kg of short asbestos drums and 1300 kg of rock flour are then stirred in. A sample taken after a total stirring time of 4 hours has a softening point of 85 C.

The joint sealing compound produced in this way corresponds to the high quality requirements, such as those for example by the Swiss standard 71 625, by the American specification SS-S-164 and by the German »Provisional delivery conditions for bituminous joint sealing compounds« of the research company for the road system.

If this mass is heated for a further six hours or, after filling and cooling, is melted in a period of six hours and kept at a temperature of 210 C, the softening point temperature rises to a maximum of 95 C and still meets all the quality features set by the above specifications . This also indicates the problem-free usability of this joint sealing compound, since it cannot be processed on the construction site at a temperature of 210 ^° C., but rather at 180 ° C. In construction site operations, however, it happens again and again that joint sealing compounds are heated higher than necessary and than is beneficial for joint sealing compounds of the usual quality. However, the joint sealing compounds according to this invention do not suffer any appreciable loss of quality as a result of such "overheating" within the framework indicated above.

1 sheet of drawings

Claims (1)

Claim: . _ftpn when heating a gum-containing properties tom ^ ^ _{technically difficult} . TKSiSrFoimulation like the healing method "S- ^ ⁰ _..." _u f the to ve SSSStäSw methythiuramdisul .den, mercaptobenzothiazoles or diaryidisulphides in amounts of 0.1 to 5 per weight, based on the A-rubber content, ^hltZ common heating changed. B ^ ^ _{c he ahe} ^^^ om ^ The invention relates to a method for producing joint sealing compounds by heating with scrap rubber powder offset bitumen. From the German Offenlegungsschrift 1 570 187 kt a process for the production of mixtures Bitumen and old rubber known, in which specifically the old rubber in two consecutive work processes is treated and then immediately mixed with the amount of bitumen in the formulation. The product formed is suitable for gluing, insulating and sealing purposes. Any additives are not used. For watertight sealing of joints, e.g. B. in Eeton lanes such as motorways, are in large Quantities of bitumen-based grouting compounds used. These joint sealing compounds must be specific Specifications. Some of these specifications stipulate the installation of rubber in such joint sealing terraces. By installing rubber, the stability of the joint sealing compound in the heat, its impact resistance, elasticity and '"''· Cl ^ vKt *. » ₅ 30th Gladly, s ^be 'P ^ jIAXn can be made because ^Stante Hef dÄeSiungspunkt steadily decreases or increases ^en TprrethenTneMinimalwertes again, after reaching ": ■ ^nt L _{uBmaS (s} whose _equity! If one were to _express ^an « ^F. " * J ^ [? _{Urw A} , "*? for the cooking time ti.S trade, so after constant cooking time ^^ _{dje joint sealing} _ has between * Mo ^ _wa ma se emen _and ^. ^ _{the building} tax was Ξ £ to _Z for final use of the intrinsically Erweijedoch to _anst. This made the * «^ ™ ¹ _{χ | Ιβηιω} , embrittle. If it is Mas "J ^ _{£ ßmasse with} a change of the" ne Hg g _{DJE by curve C of} g _e prints ^ en chafl η _{ngpunkt continu} .erUch ab. ». smM ^ a _{ünscht> because} if heated too long Have Juch d "s U _Erwe ichungspunkte ^ hugenwrg ^ _{given of} use not 35 40 ^ _now the task is based on J ^ ¹¹ _d ^ _ltg u _m mimehlen joint sealing compounds around un g _{£ as much as possible fc and be |} ^ ™; ^C _T ⁿ _e ' _mperatur carried out boiling,, retain properties. ^sU g £ ^ 3 _enough, this is achieved in that berrascnen ^ β ^ _{A, m tgummimehl} Gemsch au _{dithic acid} , thiopheno- en ^ r ^ of ^ _thiophe , eh- s or M _"Tet amethylthiuramd.sulf.den, ssrLide _re rw ^ srvx The formulation and procedure can be as much as ₅ c higher quality joint sealing compounds, the higher the rubber content. However, this also increases the manufacturing and processing costs. B.tumen with z. B. Altgumm.mehl at high temperatures be stirred for a long time. Here designated the period of time as ■ Kochze.t the «n Bitumen-old rubber flour mixture (which also contains plasticizers, mineral additives such as mineral flour, Mineral fibers and other additives let ^ _{210 c lower} . _{ktes is} already after about 3 '/ ₂ ^^ Α ^ γ increase in softening point hours enjcjtt. The A ^ ^ "^ ^ ^. the block _{circuit is} unsuitable, for the previous _{works too} da ^ m; ¹ ^ resistance to cold, elasticity ^ f go hand in hand. ^^ TJ ^ gS ,,,,, _surprising that VuI- It was ^^ u oe heat their properties until they are finally poured. better s, " _k heschieun * and ve, _{the invent}