Dry glue for wallpaper and method thereof

 

(57) Abstract:

Describes how to obtain the dry glue for Wallpaper, which provides for mixing of the starch commodity humidity 13 - 20% with a reagent solution containing 0.04 to 0.2% of sodium hydroxide, 0.2 to 2.0 percent borax and 0.1 to 1.0% fruit essences to the dry weight of the starch, to obtain a mixture with a mass fraction of moisture 22.5 to 25.0% of the subsequent thermo-mechanical treatment of the mixture extrusion method at a temperature of 135 - 155oWith the pressure in the working chamber of 0.8 - 1.4 MPa for 32 - 40 C. also Described dry glue for Wallpaper. The technical result is to intensify production and improve the quality of dry glue, reducing its cost and simplification of the process of preparing ready-to-use adhesive that does not require cooking and prolonged swelling. 2 c.p. f-crystals, 1 table.

The invention relates to the field of dry powdered starch adhesives, soluble in cold water, and can be used in the starch industry and in everyday life for wallpapering.

Known dry powder adhesives brand "Extra" and "CMC-N" (karboksimetilcelljulozy) used for wallpapering.

Glue the "Extra" vkljuchaetsja. - M.: Stroiizdat. 1984, S. 188).

The disadvantages of this glue should be what he is after dissolution in water becomes dark due to the presence of dextrin and copper sulphate. To use, you must perform a number of operations to carry out the mixing glue with water; boiling mixture (heating the aqueous dispersion to 90 - 95oC) cooling the adhesive to room temperature. This greatly limits its use in new buildings due to the lack of necessary equipment and heaters and the impossibility of melting glue in under construction houses.

The closest in technical essence and the achieved positive effects to the invention the substance is dry glue for Wallpaper "CMC-N, containing 90 - 92% of the polysaccharide is carboxymethyl cellulose and 8 to 10% water. (Glue Wallpaper brands CMC-N. THE 6-15-1077-77).

The disadvantage of this glue is that it making you want to spend a lot of time on the dispersion of the adhesive in water - 12-24 hours at the following ratio of components in weight%: glue KMTS-N" - 10% water - 90%.

The adhesive has high alkalinity and the ability to penetrate through the base paper Wallpaper, which significantly limits the scope of his primeramente glue "CMC-N" conducts to the formation of Wallpaper dark spots, bands greening metal pigments remaining on the Wallpaper after gluing and drying.

The closest in technical essence of the method of production and achieved the positive effect of the invention is a method for the production of dextrin (polysaccharide adhesive based on starch), manufactured according to the approved instructions. (Instructions for the production of dextrin, approved by the Deputy head of the Main Department of confectionery and starch industry Ministrom of the USSR M., Gubina December 25, 1980).

The method includes processing the commodity starch humidity 13 - 14% reagent - solution of hydrochloric acid in the amount of 0.08% by dry weight of the processed starch, heat treatment of the mixture of starch with an acid solution at a temperature of 135 - 155oC for 3 - 4 hours on the devices of periodic action, then the cooling of the dextrin to a temperature of 40 - 50oC for 15 - 30 min, grinding grain and screening of dextrin.

However, this method allows to obtain dextrin, which is used only as one component in the production of Wallpaper glue "Extra" and may not be used in pure form for gluing on the et and has the ability to penetrate through the paper when the concentration of the adhesive is less than 20%.

The technical task of the present invention is to intensify production and improve the quality of dry glue, reducing its cost and simplification of the process of preparing ready-to-use adhesive that does not require cooking and prolonged swelling.

The solution of the technical problem is achieved by the proposed method have the extrudate is dry powder krahmaloprodukt by thermo-mechanical treatment of the mixture of starch - R-R reagents with a mass fraction of moisture 22.5 to 25.0% of the extrusion installation, for example, twin-screw extruder brand RZ-QED-88 at a temperature of 135 - 155oC, the pressure before the matrix of 0.8 - 1.4 MPa for 32 - 38 C.

The method of obtaining dry powdered starch glue for Wallpaper is as follows: starch commodity humidity (13 - 20%) to introduce the reagent solution to obtain a mixture with a mass fraction of moisture 22.5 to 25.0% and a content of 0.04 to 0.2% NaOH (sodium hydroxide), 0,2 - 2,0% borax (sodium binarily tetraborate) and 0.1 to 1.0% fruit essences (OST 18-103-84 aroma food Essences for the confectionery) to the dry weight of starch.

The addition of the reagent solution is produced with continuous stirring KRA is 135 - 155oC, frequency of rotation of the augers - 180 - 190 rpm and the pressure before the matrix of 0.8 - 1.4 MPa for 32 - 40 C, the mixture is then forced through the die holes of any shape.

Thermomechanical treatment of the mixture at the specified mode provides obtaining the extrudate white color with a high bonding strength, good dispersibility in cold water, a pleasant smell and is resistant to the action of microorganisms.

High pressure and temperature in the working chamber of the extruder and the presence of sodium hydroxide and borax allows for a short period (32 - 40), not only to destroy the structure of the grains of starch and destructivity his macromolecules, but also to ensure the formation of the product with the new structure, including complex compounds borax split-starch polysaccharides and part of free water through hydrogen bonding.

Adding borax significantly slows down the formation of ordered aggregates of molecules are linear polysaccharides of starch in aqueous dispersions of adhesive, accompanied by their dehydration and precipitate in the adhesive. Processed in the conditions of extrusion krahmaloprodukt easily dispersed in cold water, has a homogeneous consistent. The resulting extrusion processing product containing 90% extruded starch and 10% water, ground, providing particles passing completely through a sieve with holes 3x3 mm

Shelf life of dry glue in place at a relative humidity of 65 - 70% not less than 2 years.

The use of alkali of less than 0,04% by dry weight of the starch does not provide the required splitting of the starch macromolecules. Obtained in such conditions, the water dispersion of the extrudate have low bonding strength and are dispersed in cold water with formation of a large number swelled but did not dissolve in water lumps of starch.

The increase in the consumption of alkali more than 0.2% lead in extrusion processing to a high degree of splitting of the starch macromolecules and obtaining aqueous dispersions of adhesive with a low viscosity at high solids content. This adhesive has a high fluidity and penetrates at gluing through the Wallpaper.

The use of other alkali increases the cost of dry adhesive and cannot provide light glue with good solubility in cold water and gluing ability.

Increased consumption of borax more than 2.0% leads to arr is in lumps.

Reducing consumption of borax less than 0.1% does not provide sufficient binding of water does not increase the viscosity of aqueous dispersions of adhesive. The adhesive thus obtained liquid, quickly exfoliates and has a low bonding strength.

Increase consumption of fruit essences more than 1.0% leads to a sharp odor, and reduced fruit essences less than 0.1% almost does not feel pleasant smell.

Adhesive for gluing of wall-paper is prepared as follows: dry extrudate starch dissolved in cold water with continuous stirring.

Below is the recipe we offer glue (in wt.%): the extrudate is 5-9%, water - 95-91%.

Ready-to-use adhesive is a light uniform castelobranco mass, which is uniformly applied on the surface of the Wallpaper. Tack glue high. The drying time of the glue - 2.0-2.5 hours, glue Extra 12 hours, glue "CMC" - 7-9 hours.

The shelf life of the diluted water extrudate 2 to 10 days.

The adhesive has a low cost, due to the high intensification of production and cheapness of raw materials.

Example: corn, tapecopy or potato starch commodity humidity is 0,5, of 0.1 to 1.0% borax, 1,1% fruit essences to the dry weight of starch.

Vegetarianismo processing the mixture at a moisture content of 22.5%, 23%, 24.1% and 25,0% is carried out in co-rotating twin screw extruder at a temperature of 135, 145, 150 and 155oC and the pressure before the matrix of 0.8 - 1.4 MPa.

In the extrusion processing receive adhesive for Wallpaper with physical-chemical indicators presented in the table.

1. The method of obtaining dry adhesive comprising mixing starch with a reagent solution heat treatment of the mixture at a temperature of 135 - 155oC, grinding and sieving, characterized in that for the degradation of starch in it add the reagent solution containing 0.04 to 0.2% of sodium hydroxide, 0.2 to 2.0 percent borax and 0.1 to 1.0% fruit essences to the dry weight of starch, and thermomechanical processing mixture humidity 22.5 to 25.0% of spend extrusion method over 32 - 40 C at a pressure of 0.8 to 1.4 MPa.

2. Dry glue for Wallpaper, including polysaccharides and water, characterized in that the polysaccharide is a dry powder extrudate obtained under item 1, containing degraded polysaccharides starch, 0.04 to 2.0% of sodium hydroxide, 0.2 to 2.0 percent borax and 0.1 to 1.0% fruit essences to the dry weight of starch.

 

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