SU718438A1 - Heat-insulating composition - Google Patents

Description

The invention relates to compositions of thermal insulation monolithic compositions for pipelines and can be used to apply monolithic thermal insulation on steel pipes of heat networks, which can be expanded, in particular, by channel-free methods. The known thermal insulation composition, comprising 200-300 kg of bitumen and 2 m of expanding vermiculite is a porous filler of 1 m of thermal insulation, which is the closest to the technical essence and the effect assessed for the invention of C. Thermal insulation based on bitumen bitumen time under the action of heat from the heat conductor undergoes physicochemical changes, in which, in particular, the isolation reaction changes from basic (pH 7.2-7.92) to acid (pH 3.40-3.80). As a result of this, an intense corrosion of the steel pipe and its premature failure are occurring. The aim of the invention is to increase the service life of the insulated pipeline. This is achieved by the fact that the heat insulating composition for pipelines, including bitumen and expanded vermiculite, additionally contains an expanded condensate at the following ratios of components wt.%: Bitumen 333 - 62.5 Extended-vermiculite5.0 - 63 , 0 The expanded hydrophlogopite 3.7 - 32.5. The preparation process for this tepzoneol composition is as follows. Metered quantities of exfoliated vermiculite and expanded hydrophlogopite are introduced into the forced action mixer and mixed for 0.5-1 min, and then, with continued displacement, the bitumen melt with a temperature of 150-200 C is introduced into the mixer. 7 min. Until a homogeneous mass is obtained. Thereafter, the molding mass with a seal is carried onto the surface of the pipe being molded. One of the appropriate areas of application for this thermal insulation mass is: i. , „-. ....-. L ..,;,;; -...,., -. W.-...- .., is Production of thermal mojtaiaim pipelines of heat networks, laid out in a rolling way. The table shows the options for the preparation of the proposed composition to obtain 1 m 5 of a chesuva and 313. The main properties of thermal insulation with the following components: Volumetric ksssa kg / m $ 00 - 650 Yr of strength, compression, kgf / cm 5-9

Components, wt.

Mixture, N

Bitumen grade BN-IV

33.3

Swollen

Swollen hydrofloid vermiculite

63.0

3.7 8 Flexural strength, kgf / cm 2-2.5 Heat conductivity coefficient, kcal / MH deg 0.085 -0.105 The addition of expanded hydrophlogopite to the heat insulation 1b to the compressor eliminates the change in the reaction from basic to acidic after heat treatment and thus significantly increase the durability of the steel pipeline.

F o r la inventive

The testosisation composition for ipyfip conductors, including the “1 and all uchivyv vertikulit” bandage, so that, in order to extend the duration of the pipe pipe)) ESh, the portraite contains an exaggerated tube that contains a swollen pipe pipe that contains a puffed pipe tube. :

Btum33.3 - 624

Vopuadins vermiculite5.0 - 63jO

Increasing hydroflogopit 3,7-32,5 30 Sources of information

shrinigye during; BffliMaiffle in the examination; 1. Akht mov Ya. A., Gemmerling GV. Schuyizvodstvo puffed vermiculite and products based on it. Chel Binsk, UralNIIisomproject, 1974, p. 90 .;

Claims (1)

Claim A heat-insulating composition for pipelines, including bitumen and expanded vermiculite, with the fact that, in order to increase the service life of the insulated pipeline !? it additionally contains expanded hydroflogopite in the following ratio of components, wt.%: Bitumen 333 - 623 Expanded vermiculite 5.0 - 63f) Expanded hydrophlogopite 3.7 - 32 D 30 Sources of information taken into account in the examination 1. Akhtyamov Y. A., Gemmerling G. V. Production of expanded vermiculite and products based on it. Chelyabinsk, UralNIIstromproekt, 1974, p. 90.