SU545654A1 - Mastic for waterproofing and corrosion protection - Google Patents

Description

one

The invention relates to the preparation of bitumen mastic modified with diene oligomers. Such mastics can be used as waterproofing, as well as to protect pipelines from corrosion.

Bituminous compositions modified with polybutadienes with terminal halogenamine groups are known. However, the preparation of such compositions is difficult, requires the additional introduction of diluents, which reduce the physical and mechanical properties of protective coatings.

The technical essence and the resulting positive effect closest to the invention is a composition that includes bitumen and liquid oligodiene rubber-police, rubber SKD-W (devilinovy) and SKPS-ZO prostate (butadiene styrene) 2. Such mastics have cholesterol-mechanical properties. however, their widespread use is limited to a relatively narrow plasticity range and low frost resistance (the brittleness temperature for plastic compositions is minus 20 ° C, and for refractory materials minus 5 ° C).

The purpose of the invention is to expand the plasticity interval and lower the temperature of the brittleness of mastic. This goal is achieved by the fact that mastic, including bitumen and oligodien, as oligodiene contains oligobutadiene with terminal nitrile groups with a molecular weight of 1500-2000 in the following ratio of components (% by weight):

Oligobutadiene with terminal nitrile groups 5-30

Bitum7O-95

Oligobutadiene with terminal nitrile groups (SKD-O rubber) has the following characteristics:

Molecular Mass 150000-2000

The content of nitrile groups, 2.5-3.5%

Viscosity at 25 ° С, l. - 15-25

Functionality 1.9-2.0

Physical state

liquid

The mastic is prepared by introducing rubber into the molten bitumen at

temperature 120-150 ° C, followed by homogenization of the mixture by mechanical stirring at this temperature for 15 minutes

The amount of rubber in the mixture varies depending on the degree of oxidation of the bituminous raw materials and the specified properties of the prepared mastic.

Example. A portion of the bitumen is loaded into the mixer, equipped with a mechanical stirrer, heated to a temperature of 120 ° C, turn on the mixer and serves SKD-0 rubber. Mixing duration 10 min.

The physicomechanical properties of the resulting mastics, depending on the amount of the added additive, are presented in Table one.

Table 1

PRI mme R 2. Prepare a mastic from bitumen obtained by oxidizing tar and oligobutadiene containing terminal nitrile groups (SKD-O). Mixing the extended plasticity range for the proposed mastics, the low brittleness temperature makes it possible to use mastics at both high and low temperatures. In addition, SKD-0 rubber combines well and quickly (within 15 minutes) with highly oxidized bitumen, the resulting product has improved physicomechanical properties, and the technology of preparing polymer-bitumen mastic is simple and easy to implement on existing equipment.

Claims (2)

Invention Formula Mastic for waterproofing and corrosion protection, including bitumen and eligodiene, characterized in that, in order to reduce the temperature of brittleness and extend the plasticity interval, as oligodiene it contains oligobutadiene molecular weight of 1500-2OOO with terminal nitrile groups in the following ratio of components (in wt.%): water according to the technology described in example 1, at a temperature. The physicomechanical properties of the resulting mastics, depending on the amount of the added additive, are presented in Table 2. Table 2 56 Oligobutadiene with trailers1, UK Patent No. 1269302, nitrile groups of 5-30kl. From 3 N, 1972. Bitumen 70-952. Kozlovska A, A. Polymer and Sources of Information, taken into consideration from corrosion wires, M., Stroyizdat, mania during examination: 1971, p. 34 - prototype. 545654 liumbitum materials for healed pipe