SU757578A1 - Composition for sealing construction articles - Google Patents

Description

The invention relates to compositions based on synthetic rubber, namely to the sealing compositions used to seal the joints of large-panel structures and buildings 5 made of concrete, metal, glass, etc.

Known sealing composition based on liquid polysulfide rubber, diluent, hardener, accelerator, filler. YU

However, the release of such sealants is hampered by the scarcity and high cost of polysulfide rubber Γΐΐ.

15

A composition for sealing and waterproofing building structures, containing a copolymer of butadiene, acrylonitrile and methacrylic acid, a plasticizer, an amine cure agent, is known. trifunctional epoxy resin and filler [2 ^.

The composition is characterized by increased deformability, but cannot be used to seal open 25 joints of building structures due to the fact that it does not have sufficient tixotropy (in the first 30 minutes, the sealant has a 50 mm shear flow). Expiration date sos-30

2

It is 1.0-1.5 months, which is also not enough.

In addition, the three-functional resin packer UP-610 used in the composition of the sealant is deficient and expensive.

The closest in technical essence and the resulting positive effect to the invention is a composition for sealing building structures [W], containing, wt.%:

Butyl copolymer diene, acrylonitrile and methacrylic acid 43.2 Thinner benzo-ash type (for example, toluene) 8.7 Amine Hardener 3.5 Bifunctional epoxy resin 28,8 Accelerator 1.4 Filler 14.4

This sealing compound is toxic, does not have sufficient thixotropy, and also

deformative properties.

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757578

The aim of the invention is to increase the thixotropy, deformability and reduced toxicity.

This is achieved by the fact that the composition for sealing building structures, including a copolymer of butadiene, acrylonitrile and methacrylic acid, a bifunctional epoxy resin, a diluent, a hardener and a filler according to the invention contains as a hardener a spent catalyst in the production of butadiene from ethyl alcohol of the following composition, wt.% :

MD (OH) _g

MDO

ΖηΟ

Ζη (0Η) ₂

Water

15.7-19 55-75 '

2-5

6-10

The rest

and as a diluent, a mixture of esters based on adipic acid and mono-, di- and triethylene glycols in the following ratio of components, wt.%:

Acrylonitrile butadiene and methacrylic acid copolymer Bifunctional epoxy resin Thinner Hardener Filler

40-60

5-10

10-30

1-4

Rest

Used diluent - a mixture of esters contains 1.9-3.3 hydroxyl groups and 0.02-0.1% carboxyl

(groups (building polyester - PM38-103260-75).

Actinal is used as a hardener, which is a spent catalyst in the preparation of butadiene from ethyl alcohol and having the following optimal composition,%: MD (0H) 2 16.2) MDO 67.85 ",

ΖηΟ 2.1, 'Ζη (ОН) ₂ 7.6, water - the rest.

For technology * ^v hermetic properties can be replaced

part of polyester for dibutyl phthalate (up to 50%).

The composition of the sealant is prepared according to the usual technological scheme under normal conditions as follows. First, prepare the paste by mixing a copolymer of butadiene, acrylonitrile and methacrylic acid with a diluent (plasticizer) in

20 for 10 min, obtained at

a filler is injected with this, and stirring is continued for another 20 minutes.

Then, prepare another pasta by

25 mixing the epoxy resin, diluent, hardener and filler with stirring for 20 minutes, after which the finished mass is ground on an ink-grinding machine.

__ Prepared pastes are mixed for 4 ° 5-10 min, and the paste containing

hardener, take in the amount of 20% of the paste obtained on the basis of the copolymer.

The table presents the formulations of the compositions and their properties.

with

Formulation and properties Famous composition one 2 3 four four 2 five four five 6 Butadiene, Acrylonitrile, and Methacrylic Acid Copolymer 43.2 40.0 60.0 60.0 41.6 Toluene Thinner 8.7 - - - - Thinner-construction polyester - 20 „0 10.0 20.0 22.5 Hardener-polyethylene floor ^ amine 3.5 - - - - Hardener actinap - 1.0 4.0 1.0 2.0 Bifunctional epoxy resin 28.0 9.0 5.0 ten 6,6 Filler: kaolin, titanium dioxide, aerosil 14.4 30.0 21.0 9.0 27.3 Accelerator 1.4 - -

five

757578

6

Table continuation

one 2 five four five 6 Deformation at break,% 37.0 150 170 220 235 Flow (thixotropy), mm: at 20 ° C 50 0 0 0 0 at 70 ° C 50 0 0 0 0

As can be seen ¹ from the table, the obtained sealants have thixotropic properties - the runoff at 20 ° C and 70 ° C is 0 mm, the deformative properties are much higher (150-235%) of the proposed composition compared to the prototype (37%).

The shelf life of the composition - 8 months

In addition, to obtain a sealing composition of epoxy resin required 4 times less compared with the prototype. Exclusion from the amine hardener reduces the toxicity of the material.

The use of polyester as a thinner increases the safety in the manufacture of sealant under production conditions and improves the sanitary-chemical characteristics of the sealing material.

The composition can be used for sealing joints of large-panel structures and buildings made of concrete, metal, glass, etc.

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20

25

thirty

35

characterized in that, in order to increase thixotropy, deformability and reduce toxicity, it contains as a hardener a spent catalyst in the production of butadiene from ethyl alcohol of the following composition, wt.%:

Md (0H) ₂

MDO

ΖπΟ

Ζη (0H) ₂ Water

15.7-19

55-75

2-5

6-10

Rest,

a ’as a diluent mixture ether-. ditch based on adipic acid and mono-, di- and triethylene glycols in the following ratio of components, wt.%:

Butadiene, Acrylonitrile, and Methacrylic Acid Copolymer Bifunctional Epoxy Resin Thinner Hardener Filler

40-60

5-10

10-30

1-4

Rest

Claims (1)

Claim Composition for sealing building structures, including a copolymer of butadiene, acrylonitrile and methacrylic acid, a bifunctional epoxy resin, a thinner, a hardener and a filler, 40 45