SU1208059A1 - Sealing compound - Google Patents

Description

moisture at 24 h at 20 ° C.

10 °

The invention relates to the construction and chemistry of polymers, in particular to compositions of sealing compounds for repair, reinforced concrete structures,

The purpose of the invention is to increase adhesion to wet concrete and improve processability.

Example 1. The technology of preparation of a sealing compound is as follows: the compound is made of 4 components on any mixing equipment at 10-20 ° C for 2-3 minutes under a layer of inert gas. Viability of the sealing compound is not less

2 months at 20 C. The viability of the compound upon contact with the spirit is not less

According to the described technology, a sealing compound of a drying composition is prepared, wt%:

Isocyanate prepolymer

toluene diisocyanate

and triethanolamine4

Isocyanate prepolymer

toluene diisocyanate

and block copolymer oxide

propylene with ethylene oxide (8% ethylene oxide,

molecular weight 900) 21

K57 polyisocyanate

Ethyl silicate 3218

The composition is prepared in a propeller-type mixer and has a viscosity based on a VZ-4 viscometer for 6 seconds. The minimum crack tire into which the compound passes at atmospheric pressure is 0.06 mm. Adhesion of a compound to concrete with a moisture content of concrete of 6, 8, 10, and 12% is 61, 66, 70, 75 erg / cm, respectively. The preservation of adhesive contact for 200 cycles of freezing - thawing was 100%.

Example2. According to the described technology, a sealing compound of the following composition is prepared at 15 ° C, wt%:

Isocyanate prepolymer

toluene diisocyanate

and triethanolamine6

Isocyanate prepolymer

toluene diisocyanate

block copolymer oxide

propylene with ethylene oxide (10% molecular weight ethylene oxide 1100) 23 Polyisocyanate K49

Ethyl silicate 3222

The composition is prepared in a propeller type mixer and has a viscosity by viscosity indicator VZ-4 5 s. The minimum width of cracks L1, into which the compound passes at atmospheric pressure, is 0.04 mm. The adhesion of the compound to concrete with a moisture content of concrete of 6, 8j and 10 and 12% is 65, 70, 73, and 75 erg / cm2, respectively. The preservation of the adhesive contact after 200 cycles of freezing — thawing is 100%.

I

PRI, and measure 3. According to the described technology, a sealing compound of the following composition is prepared at 20 ° C, wt%:

Isocyanate prepolymer triethanolamine.7

Isocyanate prepolymer of propylene oxide block copolymer with ethylene oxide (10% ethylene oxide I molecular weight 1100) 24 Polyisocyanate K45

Ethyl silicate 4024

The composition is prepared in a propeller type mixer and has a viscosity of

BZ-4 viscometer 4 s. The minimum crack width into which the compound passes at atmospheric pressure is 0.04 mm. The total cure burden in the gap of 0.6 mm at a moisture content of concrete of 10% and a temperature of 20 ° C is 7 hours. The adhesive strength of the compound to concrete at a moisture content of concrete 6, 8, 10 and 12% is respectively. 68, 72, 75 and 74 erg / cm. Preservation

adhesive contact after 200 freeze-thaw cycles is 100%.

The compositions of the sealing compounds of the examples and their physico-mechanical parameters are given in Tables 1 and 2, respectively.

As can be seen from the table. 2, the proposed sealing compound has manufacturability and high durability of adhesive joints.

Isocyanate prepolymer of triethanolamine (TU-38-103-502-81)

Isocyanate oxide prepolymer

propylene with ethylene oxide

(8% ethylene oxide molecular

mass 900)

(tr. BMNIIK 61-14)

Isocyanate prepolymer of propylene oxide with ethylene oxide (10% ethylene oxide 1100 molecular weight) (Tr. VMNIIK 61-14)

Isocyanate prepolymer of nitrogen-containing polyol of castor oil (TU 6-05-251-76-78)

Isocyanate prepolymer of propylene oxide copolymer with tetrahydro-furfur (TU 6-05-251-27-73)

Polyisocyanate K (TU 113-03-29- 11-83)

Ethyl silicate 32 (GOST 10401-73) Ethyl silicate 40 (GOST 10401-73) Solvent (GOST 10604-78)

Table 1

22

24

58

22

53 20

45

24

20

The preservation of adhesive contact after 200 cycles for the continuation of table 2

Claims (1)

A SEALING COMPOUND, · comprising an isocyanate prepolymer of a nitrogen-containing polyol and an isocyanate prepolymer of a propylene oxide copolymer, characterized in that, in order to increase adhesion to wet concrete and to increase processability, the compound contains asocyanate prepolymer of a nitrogen-containing ethylene triol isolate and ethylene triol isolate propylene oxide copolymer prepolymer - prepolymer of toluene diisocyanate and block copolymer of propylene oxide with ethylene oxide containing 8-12% o sietilnyh links mol.mae. 900-1100 and additionally contains polyisocyanate and ethyl silicate in the following ratio of components, wt.%: Prepolymer of toluene diisocyanate and triethanolamine A prepolymer of toluylene isocyanate and a block copolymer of propylene oxide with ethylene oxide containing 8-12% hydroxyethyl: mol. 900-1100 Ethyl Silicate Polyisocyanate SU ..,. 1208059