SU1143734A1 - Heat-insulating composition for pipelines - Google Patents

Abstract

HEAT-INSULATING COMPOSITION FOR PIPELINES, including expanded clay, bituminous stinging oil, salted oil, powdered asbestos and triethanolamine glue, characterized in that, in order to reduce water absorption and increase electrical resistance, it contains addition bottoms of isocyanates, which will be included in a table next to 29 if you have a list of below. %: Expanded clay 50-68 Bituminous slurry 15-30 Sol bulk oil 4-12 Powdered asbestos10-15 Triethanolamine glue 0.4-2.0 Vat residues of isocyanates 1-5

Description

liU

WITH

oo 4 The invention relates to compositions of heat, insulating compositions and may be used to isolate pipelines laid without channels, including in subsidence, water expanded and water saturated corrosive soils. A known composition for insulating pipelines, comprising, by weight,%: expanded clay 50-80 | bituminous to a stagnant 14-32; salt oil 4-12 and graphite powder 2-6 ij. However, the thermal insulation of this composition has insufficient mechanical strength. The closest to the invention in its technical essence and the result is a thermal insulation composition for coating pipelines, including, in wt%: expanded clay 50-70; bituminous to a 15-30; salt oil 4-12; powdered asbestos 10-15 and triethanolamine adhesive 0.4-2.0 RZ. A disadvantage of the known composition is that the insulation from it is characterized by a high water absorption coefficient () and insufficient electrical ohmic resistance, which limits the scope of its application, does not allow its use in water-graded soils, and the same in the construction of pipelines in areas saturated By urbanization, the purpose of the invention is to reduce water absorption and increase the resistivity coefficient of the material. The goal is achieved by the fact that the heat insulating composition for pipelines, including expanded clay, bituminous sticking oil, salted oil, powdered asbestos and triethanolamine glue, additionally contains residues of isocyanates in the following ratio of components, wt.%: Expanded clay 50-68 Bituminous sticking 15 -30. Solvent oil 4-12 Asbestos powder tO-15 Triethanolamine glue 0.4-2.0 Distillation residues of isocyanates1-5 Distillation residues of isocyanates, such as polyisocyanate K, are obtained by distillation of volatile components and at an hour distillation of 4,4-ary dife.nilmetandiizotsianata of polyisocyanate. The product is a mixture of diphenylmethane diisocyanate with high molecular weight compounds, which are the product of its polymerization, grouped together. (CN, -) and (). like

NCO OCNHV / V-CH, - -CH,

NCO

G f

NCO

where, 2,3,4,5 ,,.,

The composition of the polyisocyanate To wt,%:

Liphenyl methane diisocyanate

Resins (mixture of various

isocyanates), resin composition

not verifiable by

TU-113-03-29-11-83

on PIC-K

-NCO group content

Achieving this goal is ensured by the formation of a three-dimensional network structure of the composition in the interaction of bottom residues of isocyanates with bituminous in dying, salt oil and triethanolamine glue. This creates a chemical complex with urethane bonds and a predominantly closed porosity, which ensures low water absorption.

system cation, and, consequently, low water absorption of the entire composition.

An increase in the electrical resistance of the composition is ensured by the formation of a branched polymer with a high molecular weight, i.e. dielectric.

The overall structural formula of the polymer polymer is:

- -IS-CO-KH-R-NH-CO-NSO I

WITH

I NH ... ... NH

The composition is prepared in the following manner.

Heated bitumen heated to 160 ° C is mixed with clay of a particle size of 0.5–15 mm, and then salt oil, previously mixed with powdered asbestos, is added to the mass, after which

344

the mixture is introduced in series with an interval of 2–3 min vat. residues of isocyanates and triethanolamine glue. The prepared composition is poured into a mold, where it is cured for 16-20 hours at 18-20 ° C. After curing, the product is decalcified. Specific formulations of the proposed composition and known are listed in table. one.

The physicomechanical parameters of the thermal insulation material are listed in Table. 2

As can be seen from the test data of the proposed composition and known, the composition of the proposed material is characterized by significantly lower water absorption values and higher electrical resistance, which in practical use

in the construction of pipelines by the most economical channelless method, it can significantly expand the scope of application of thermal insulation material.

Table

trash

68 56 56 56 56 56 54 54 54 54 54

15

15 15 15 15 15 22

12

12

12

12

12 . 22 22 22 22

ten

2.6

15

1 2 3 4 5 1 2 3 4 5

14

13

12

eleven

15

14

13

12

eleven

30 30 30 30 30 22 22 22 23

50 50 50 50 50 51 51 51 51

st50-70

15-30

630

1.2 1.8 610 600 1.3 1.0 600

Continuation of table

14.6

1 2 3 4 5 2 3 5 1

0.4 13.6

0.4 12.6

0.4. 11.6

0.4 10.6

0.4 15 14 12 15

2

2

2

2

0.4-2.0 10-15

12

Table 2

ten

180

13 12 12 13

10 180 180

10 180

ten

Claims (1)

THERMAL INSULATION COMPOSITION FOR PIPELINES, including expanded clay, bituminous binder, solar oil, asbestos powder and triethanolamine glue, characterized in that, in order to reduce water absorption and increase electrical resistance, it additionally contains still bottoms of isocyanates in the following ratio of components, wt.%: Expanded clay 50-68 Bituminous binder 15-30 Salt oil 4-12 Powdery asbestos 10-15 Triethanolamine glue 0.4-2.0 VAT residues isocyanates 1-5