Polymer sealing composition for waterproofing

FIELD: chemistry.

SUBSTANCE: invention relates to production of waterproofing materials in form of profiled objects - cords, meant for sealing joints in unit construction and which provide for waterproofing through fast water regain. The polymer sealing composition contains, wt %: polymer - synthetic ethylene-propylene triple rubber - 23.78-86-80, natural bentonite - 8.68-71.34, sodium carbonate - 0.09-2.38, titanium white - 2.38-4.34 and colouring pigment - 0.09-0.12.

EFFECT: increased degree of water regain, resistance to effect of atmospheric factors, increased frost- and ozone resistance, cohesion strength and elasticity after the material dries.

1 tbl, 2 ex


The invention relates to the chemical industry, in particular the production of waterproofing materials in the form of specialized products (cords)designed for sealing joints in modular construction and provides waterproofing through a rapid swelling in water.

Known layered cross-linked material [German Patent No. 2059034 from 27.04.1996, IPC EV 3/16 "laminate"], containing in its composition as swellable filler bentonite sodium.

The disadvantage of this material is rather complicated method of application, requiring mechanical fixation of the joint. In case of mechanical damages bentonite crumbles and wakes up from layers. It should also be noted that the fabric base when in prolonged contact with the swollen material is quickly destroyed and can not withstand cyclic loads at the drop of humidity and temperature.

Known polymer composition that contains Portland cement, sodium bentonite, lignosulfonate, and other components [Patent of Russia №2193634 from 27.11.2002, IPC EV 1/62 "Waterproofing polymer mixture"].

The disadvantage of this material is the way it is applied in the form of a soft mastic, followed by curing. Under cyclic loads during differential humidity and temperatures similar sealant on the basis of the e cement cracked and not completely reliable.

As the closest analogue is treated polymer composition for roofing materials [Patent of Russia №1781250 from 15.12.1992, IPC C08L 23/22 "Polymer composition for roofing materials"], comprising a polymer is butyl rubber, bentonite, pigment (dye) in the specified amounts.

The technical problem of the invention is to develop a formulation of a polymeric sealing composition for sealing, providing a high degree of swelling in water, resistance to weathering, high frost and ozone resistance, cohesive strength and elasticity after drying the material.

For the technical solution proposed polymeric sealing composition comprising a polymer, bentonite and a coloring pigment, in which the new is the purpose of the material, as well as that for the preparation of compositions are used as synthetic polymer ternary ethylene-propylene rubber (Sept), as bentonite is a natural bentonite and additionally sodium carbonate and titanium oxide at the next selection of the ratio of ingredients, wt.%:

Natural bentonite8,68-71,34
Sodium carbonate0,09-of 2.38
Titanium white2,38-4,34
Pigment pigment0,09-0,12

The technical result of the invention consists in the stability of the sealing material to weathering, frost and otnositelnosti, cohesive strength and elasticity after drying the sealing material.

The use of SKEPT provides the necessary cohesive strength, elastic, adhesive properties of polymeric sealing material. The use of natural bentonite and soda ash provides a high degree of swelling of the material within a short period of time. For the first three hours of material swells up to 60% and during the day up to 200% when fully immersed in water.

In contrast to the developed waterproofing material does not require special sophisticated equipment for installation is flexible, does not crumble and will not spall in case of mechanical damages, and when it was manufactured with environmentally friendly materials and technologies.

Color waterproof cord made of the proposed material can be used for sealing horizontal and vertical "x is cold and structural joints in the concrete underground structures, places of passage of engineering communications in monolithic concrete structures. Due to the bright contrasting colors it can be clearly seen during installation, allowing you to easily control the quality of works during installation. Due to the composition of the polymer sealing compositions waterproofing cord retains flexibility at low temperatures to -20°C and is able to swell in water more than twice, even after two hundred cycles swelling/drying with intermediate freezing.

Method of preparation of polymeric sealing composition for waterproofing is carried out as follows.

On a technical scale weigh rubber and other ingredients; the container is placed 71,34 wt.% natural bentonite, a type of 2.38 wt.% sodium carbonate and activation of bentonite by dry method; roll 23,78 wt.% rubber, then add the activated bentonite, 2.38 wt.% titanium oxide and 0.12 wt.% pigment dye; the mixture is cooked for 15 minutes and removed in the form of a sheet; the resulting rubber mixture is cooled down and cut into strips; release the sealing cord with a diameter of 10 mm on the syringe machine at 60°C.

The composition is prepared with the following choice of the ratio of ingredients:

Natural bentonite8,68-71,34
Sodium carbonate0,09-of 2.38
Titanium white2,38-4,34
Pigment pigment0,09-0,12

The method is illustrated by the following examples.

Example 1. To prepare 1 kg (100 wt%) rubber mixture on a technical scale weigh 0,87 kg (86.8 wt.%) Sept, 0,087 kg (8,68 wt.%) natural bentonite, 0,0009 kg (0.09 wt.%) sodium carbonate, 0,043 kg (2.38 wt%) titanium dioxide and 0,0009 kg (0.09 wt.%) pigment dye. Activation of natural bentonite carried out by a dry process in the vessel with the addition of sodium carbonate. Polymeric sealing composition is prepared on a roll mill at a temperature of 55°C. First roll rubber for 5 minutes, then add the activated bentonite, a mixture of rolls 3 minutes, then add titanium oxide and pigment coloring. The total duration of mixing is 10 minutes. Obtained in the form of sheet rubber mixture is cooled down and cut into strips. Sealing cord with a diameter of 10 mm are produced on the syringe machine at 60°C.

For the obtained sealing cord is defined by the following characteristics: the degree of swelling in water, cohesive paragraph shall echnosti, and are subjected to cyclic testing of swelling/drying and swelling/drying with intermediate freezing at -20°C.

Example 2. Preparation of polymeric sealing composition with a maximum amount (wt.%) substances similar to example 1, with the following ratio of ingredients: Sept - 23,78; natural bentonite - 71,34; sodium carbonate - 2,38; titanium oxide - 4,34; pigment pigment - 0,12. Due to the increased dosage of fillers mixing time increased to 15 minutes. The obtained sealing cord is analyzed analogously to example 1. The data analysis presented in the table.

IndexControlData examples
The degree of swelling, %180190200
Cohesive strength, MPa2,44,84,6
The number of cycles swelling/visian is e 10200200
The number of cycles swelling/drying with intermediate freezing at -20°C8200200

The degree of swelling of the composition was determined for days at 20°C at full immersion of the sample in water. The cycle of swelling/drying is a process of swelling of the sample for three days at a temperature of 20°C, then drying over night at 20°C. Intermediate freezing was carried out within days at -20°C after swelling in water.

According to the data given in the table, the proposed polymeric sealing composition for waterproofing meets the requirements of a high degree of swelling in water, a high cohesive strength and can withstand up to two hundred cycles swelling/drying with intermediate freezing.

The proposed polymeric sealing composition for waterproofing ensures a high degree of swelling in water, resistance to weathering, high frost and ozone resistance, cohesive strength and elasticity after drying the material.

Polymeric sealing composition comprising a polymer, entanet and a coloring pigment, characterized in that for the preparation of the composition is used as a polymer synthetic ethylene-propylene rubber, SKEPT as bentonite is a natural bentonite and additionally sodium carbonate and titanium oxide at the next selection of the ratio of ingredients, wt.%:

natural bentonite8,68-71,34
sodium carbonate0,09-of 2.38
titanium white2,38-4,34
pigment pigment0,09-0,12


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