Dry glue for wallpaper

 

The invention relates to the field of dry powdered adhesives that can be used in household and construction for wallpapering on paper and fabric bases, and also for gluing paper Wallpaper on concrete, plaster, wood and other non-metallic surface. In addition, this adhesive is used for bonding of cardboard and paper. Dry glue for Wallpaper contains extrusion starch, antiseptic, extrusion flour, as an antiseptic, sodium salt tetraboric acid. The technical result of the invention is to improve the bonding strength of the Wallpaper with the surface of the walls and the reduction in the energy intensity of the manufacturing process of the adhesive. 3 table.

The present invention relates to the field of dry powdered adhesives that can be used in household and construction for wallpapering on paper and fabric bases, and also for gluing paper Wallpaper on concrete, plaster, wood and other non-metallic surface.

In addition, this adhesive is used for bonding paper and cardboard.

Known dry glue for Wallpaper "CMC-N containing 90-92% polysaccharide carboxymethyl cellulose and 8-10% water (glue for racepath a lot of time dispersion of the adhesive in water: 12-24 hours. The adhesive has high alkalinity and the ability to penetrate through the paper-based, which significantly limits the scope of its application because of unfitness for the stickers are bright and white Wallpaper with bronze and aluminum paints. Apply glue "CMC-N leads to the formation on the Wallpaper dark spots, stripes greening metal pigments remaining on the Wallpaper after gluing and drying.

Also the disadvantages of glue KMTS-N" can be attributed to the low strength of the adhesive joint to break.

Known dry glue on THE 6-15-533-71 (Handbook of adhesives and adhesive mastics in construction. M.: stroiizdat, 1984, S. 188) containing wt. %: flour, not suitable for food purposes (or starch), 99, 1 antiseptic.

The disadvantage of dry adhesive is a high hygroscopicity.

In addition, the known adhesive characterized by low adhesion of the Wallpaper with the surface of the walls, which limits its scope because of unfitness for stickers varied in thickness Wallpaper. Another disadvantage of the adhesive is low strength of the adhesive joint to break.

For the preparation of glue needed to implement a number of operations: thoroughly dry the glue with water, leave on for 12 Chania, without burning, cooling the obtained adhesive to room temperature. The duration and intensity of the process of making glue limits its use in new buildings due to the lack of necessary equipment and the impossibility of melting glue in under construction houses.

The closest in technical essence and the achieved positive effects to the invention is glue fast food Wallpaper (see the description of the invention to the patent of the Russian Federation 2120953, MKI 6 C 09 J 103/00, publ. 27.10.98,, "Glue fast food Wallpaper"). Known adhesive for Wallpaper contains dry extrudate oxidized starch or flour obtained plugotarenko processing at a pressure of 1.5-2.5 MPa and a temperature of 160-180oWith over 30 mixture in a twin-screw extruder, comprising a starch or flour, antiseptic - carotid or sodium sorbate in an amount of 0.2% by weight of dry starch or flour and the oxidizing agent is calcium hypochlorite in an amount to provide 0,15-0,30% active chlorine on dry substance of the processed mixture, in the following ratio, wt. %: the extrudate oxidized starch or flour 8-10, water 92-90.

A disadvantage of the known adhesive, selected as a prototype, is a low coloring strength the process of extruding the mixture.

The technical result of the invention is to increase the bonding strength of the Wallpaper with the surface of the walls and the reduction in the energy intensity of the process of making glue.

The technical result is achieved by the fact that the dry adhesive for Wallpaper containing extrusion starch and antiseptic, according to the invention further comprises extrusion flour, and as an antiseptic sodium salt tetraboric acid in the following ratio, wt.%: Extruded starch - 47,5-48,5 Extrusion flour - 47,5-48,5 Sodium salt tetraboric acid - 3-5 Proposed dry glue for Wallpaper is Pelkosenniemi powdery white material. Recipe of dry glue for Wallpaper selected from the conditions for enhancing the bonding strength of the Wallpaper with the surface of the walls and reduce the intensity of the process of making glue.

Main ingredient - extrusion starch is manufactured in the following way: corn or potato starch was treated with a solution of monophosphate sodium based 2-10 wt. By weight of starch. The extrusion was carried out at 170-180oWith the number of revolutions of the auger 50 min-1the diameter of the outlet of 3.5 mm, the resulting extrudate was crushed in the crusher and about the s to avoid the formation of sludge and lumps, does not require swelling, irritating, resorptive and toxic effects on the skin, neutral colors of the Wallpaper.

The content of the extruded starch, equal 47,5-to 48.5 wt.%, provides high bond strength and durability of adhesion of the Wallpaper.

The inclusion of extruded flour, representing a white powder, manufactured in the following manner flour cereal crops was treated with a solution of monophosphate sodium based 2-10 wt by weight of starch. The extrusion was carried out at 170-180oWith the number of revolutions of the auger 50 min-1the diameter of the outlet of 3.5 mm, the resulting extrudate was ground in a hammer mill and sieved through a sieve with holes of 0.5 mm Obtained extrusion flour allows you to increase the viscosity of the finished adhesive, to provide him a good binder properties, neutrality ready solution to the colors of the Wallpaper.

The content of the extrusion flour, equal 47,5-to 48.5 wt.%, selected terms and conditions homogeneous dispersion with optimal viscosity of 40-50 MPaC.

Additive powder of sodium salt tetraboric acid (borax grade B) increases the stability of the finished adhesive, provides him with a good antiseptic properties, and resistance to D. the

The content of sodium salt tetraboric acid equal to 3-5 wt.%, selected from the conditions obtaining low adhesion properties of the glue solution, improving its performance on viscosity and strength of the adhesive joints, the optimal value of the factor solution pH of 5.7. Increased consumption of sodium salt tetraboric acid more than 5% results in glue dark color, undesirable increase in the factor solution pH. The reduction of the sodium salt tetraboric acid (less than 3%) does not provide the desired viscosity of the finished adhesive. The adhesive thus obtained liquid, quickly exfoliates and has a low bonding strength.

To obtain the claimed powder glue successively added to the powder extrusion starch, taken in an amount of 47.5-48,5 weight. %, the moisture content of 15-25%, the extrusion flour in the amount of 47.5-48,5 weight. % and the moisture content of 15-25%, sodium salt tetraboric acid in the amount of 3-5 wt.%.

All components having different faction, must be thoroughly mixed to obtain a homogeneous dry composition.

Finished dry glue Packed in bags of polyethylene film or paper with a plastic coating on the EAST 6-15-90.2. The weight of one package of dry adhesive varies the th adhesive is filling enameled or plastic utensils with cold water, gradual falling asleep in it the contents of the package in the ratio of 5 liters of water, 400 grams of dry adhesive with continuous stirring until a homogeneous consistency.

The obtained adhesive solution is ready to use and requires no swelling.

The applicant conducted laboratory studies on the viscosity of the adhesive according to GOST 8420, clean the surface of the pasted wall-paper, adhesive ability, the strength of adhesion of the Wallpaper.

To determine the viscosity was prepared with the adhesive, the viscosity of which was determined on the viscometer VZ-24 with the nozzle diameter of 4 mm according to GOST 9070 using a stopwatch with a multiplier of 0.2 C. by valid documentation. A measure of the viscosity of a 3% aqueous solution at 20oWith amounted to not less than 40 MPaC.

To determine the purity of the surface of the pasted Wallpaper and adhesive capacity temperature 202oC and humidity of 60% was prepared adhesive solution on the newspaper strip, located on a wooden plate, glued paper samples on paper and fabric bases of different thickness and left to dry for 3 hours.

Clean the surface of the glued samples was determined visually, considering about the tons of newsprint over the loose end of the Wallpaper and the subsequent separation of newspaper strips from wooden plates. Gap corresponded to the direction of fibers Wallpaper and paper.

During the tests was identified high purity surface glued Wallpaper, no breaks adhesive on the seams of the Wallpaper of paper of different thickness.

The applicant conducted laboratory studies of the strength of adhesion of the Wallpaper with the wall surfaces of the inventive adhesive and the resulting strength and burst strength as compared with adhesives selected as analogues, with glue, selected as a prototype, and with glue brand "classic Moment".

The test procedure was as follows. The ends of the strips of fabric (calico) with an area of 2.5 x 5 cm smeared ready glue, connected the coated surfaces to each other and placed for 10 min under a weight of 2 kg Then the load was removed and glued samples were dried at room temperature for 24 hours. The dried samples were cut in the longitudinal direction into strips with a width of 1.5 cm and secured the ends of the strips, not smeared with glue, clamps. Then he made a break of the adhesive joint. When testing each of the adhesives produced six breaks of three received the highest results were used to determine average value of breaking strength, divided it by 1.5 and received strength at the margin in grams per line the Wallpaper has novelty and inventive step, as the search for sources of patent and scientific and technical documentation the applicant has not identified technical solutions, which would dry glue for Wallpaper contained in addition to the extrusion of starch and antiseptic advanced extrusion flour, and as an antiseptic - sodium salt tetraboric acid, in the following ratio, wt. %: Extruded starch - 47,5-48,5 Extrusion flour - 47,5-48,5 Sodium salt tetraboric acid - 3-5 Claimed dry glue is widely applicable in everyday life and the construction for wallpapering on paper and fabric bases, and also for gluing paper Wallpaper on concrete, plaster, wood and other non-metallic surface. Also, this adhesive is used for bonding paper and cardboard. Therefore, it meets the criterion of "industrial applicability".

The claimed dry glue is made as follows. In extrusion of the starch in the amount of 47.5-48,5 weight. % add 47,5-8.5 weight. % extrusion flour, 3-5 weight. % dry powder of sodium salt tetraboric acid. The obtained dry mass is stirred in a special device to obtain a homogeneous composition. The degree of homogeneity of the obtained composition is not less than 97%.

For cold water gradually fall asleep content 400 g packaging of dry glue, dissolved with continuous stirring.

Extrusion starch, extruded flour and sodium salt Teterboro acids interact with water and with each other, forming a homogeneous light castelobranco mass, which is uniformly applied on the surface of the Wallpaper. Tack glue high. The drying time of the adhesive 2-2,5 hours. The shelf life of the diluted glue 2-10 days.

An example of a specific implementation of the inventive dry glue for Wallpaper presented in table 2.

Properties of the proposed dry Wallpaper glue and glue the prototype presented in table 3.

We offer dry glue for Wallpaper provides compared to the prototype of improving the bonding strength of the Wallpaper with the surface of the walls 1.2 times, reducing the energy intensity of the manufacturing process of the adhesive.

Claims

Dry glue for Wallpaper, including extrusion starch, antiseptic, characterized in that it further comprises extrusion flour, and as an antiseptic - sodium salt tetraboric acid, in the following ratio, wt. %:
Extruded starch - 47,5-48,5
Extrusion flour - 47,5-48,5
Sodium salt tetraboric acid - 3-5

 

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The invention relates to the field of dry powdered adhesives that can be used in everyday life for wallpapering on paper and fabric bases, and also for gluing paper Wallpaper on concrete, plaster, wood and other non-metallic surfaces

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EFFECT: composition free from displeasing odor after blending with water.

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10 cl, 2 ex

FIELD: chemistry.

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25 cl, 6 tbl, 1 ex

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19 cl, 1 tbl, 2 ex

FIELD: chemistry.

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13 cl, 2 tbl, 5 ex

FIELD: chemistry.

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8 cl, 1 dwg, 2 tbl, 22 ex

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17 cl, 1 tbl, 13 ex

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