Dry adhesive composition and method of preparation of the adhesive for bonding corrugated cardboard

 

The adhesive composition suitable for bonding corrugated cardboard. It contains native starch, swelling starch, soda ash, and the oxide or calcium hydroxide with a specific ratio of components. It can contain borax. The adhesive is produced by preparing a dry mixture by mixing native and swelling starch, soda ash, oxide or calcium hydroxide and borax, and before applying glue on the production line corrugated Board thus prepared dry mixture is stirred with water at room temperature for 10-15 min when the number of revolutions of the stirrer 800-1500 per minute. The technical result is the reduction of production areas, speeding up the process, reducing cost and improving sanitation staff. table 1.

The invention relates to the pulp and paper industry and can be used for the preparation of adhesives in the manufacture of cardboard and corrugated Board.

Known dry adhesive composition and a method of obtaining from it the glue, which is obtained in the form of extrudate through thermomechanical processing mixture comprising starch, alkaline component and borax.

Extrud will win a water-soluble product restrukturirovannogo starch and cellulose ether. To obtain the adhesive composition extrudate is dissolved in water (RF patent 2176655, 2000).

The disadvantages of the known adhesive compositions and the method of obtaining from it the glue is the need thermomechanical processing of the mixture on a special expensive equipment that requires sophisticated equipment, considerable heat and power consumption and large industrial areas.

The closest to the destination and the technical essence is known adhesive composition, which can be used in dry form to receive adhesive for gluing cardboard. This known composition is obtained from starch-containing grain raw material processed by the catalyst, which is used as the alkali solution, copper compounds at a constant transmission through a solution of oxygen or air. In the heat treatment of the mixture in the reactor at a temperature of 50-100oWith the obtained slurry containing the starch is a high molecular weight. After drying of the suspension roller dryer or furnace gases is obtained dry product with adhesive properties (patent RF 2017750, 1991).

A disadvantage of the known adhesive compositions is the complexity of its receipt, the need and the treatment is time-consuming, long, massive and powerful.

The objective of the invention is to reduce the time process, saving heat and energy, simplifying the technology of dry adhesive compositions and method of manufacture of glue it, which reduces the production area, to speed up the process, reduce the cost of finished products and to improve the sanitary conditions of the staff.

This objective of the invention is achieved due to the fact that the dry adhesive composition is obtained by simple mixing of the dry components without thermal and chemical treatment of the mixture components and without the use of special energy-intensive equipment (extruder reactor). The objective of the invention is solved by the use of the mixture as water-retaining additives - stabilizer - swelling starch and selection of a particular ratio of the mixture components, which are mixed by simple mechanical mixing without any chemical or thermal treatment. The dry adhesive composition according to the invention receive mechanical mixing of components.

To get the glue dry adhesive composition of the claimed composition is mixed with water in the ratio 1:(3,5-6) for 10-15 min when the number of the I for gluing corrugated cardboard includes native starch, swelling starch, oxide or calcium hydroxide and soda ash as the alkaline component, and may also contain borax at a rate of 0.8-1.0 wt.h. to improve the adhesive properties in the following ratio, wt.h.: Native starch - 72 - 80 Swelling starch - 15 - 30 soda ash - 1,8 - 2,0 Oxide or calcium hydroxide - 2,0 - 4,0 Main components of dry adhesive are native starches of different origin (corn, wheat, potato, tapioca) and modified - swelling (pre klasterizovannykh) starch obtained by plugotarenko processing, for example on a roller dryer.

Heated to 150-160oWith the surface of the roller dryer is served aqueous suspension of starch, with starch grains clusterized, and the paste is dried in the form of thin films and is crushed to the desired size.

Swelling starch is a dry powder that forms a paste when mixed with cold water without heating. Therefore, in the inventive composition, it is introduced as a water-retaining additive stabilizer. Technology of preparation of the dry adhesive composition is mixed native and swelling starches in SES contribute oxide or calcium hydroxide 2-4 wt.h., soda ash of 1.8-2.0, and can also be made borax in the amount of 0.8-1.0 wt. including to improve the adhesiveness of the adhesive. After thorough mixing the prepared dry mixture of the adhesive composition is weighed and Packed in bags or other containers. Packed dry adhesive composition is well stored at a relative humidity not exceeding 75% during the year.

The claimed composition of the dry adhesive composition is selected so that after mixing with water without heating it turns out the glue necessary adhesiveness and motility with stable properties, allowing it to be used for gluing cardboard or corrugated Board on the corrugator.

Preparation of the adhesive for use in bonding of corrugated cardboard on the corrugator is carried out by simple mixing of the dry adhesive composition with water in the ratio 1:(3,5-6) with constant stirring for 10-15 min rpm stirrer per minute should be 800-1500. Ready-to-use glue is a homogeneous mass, which is immediately sent to the line for corrugated Board.

Example 1.

To 80 kg of native corn starch was added with stirring 15 kg swelling corn starch, 2.0 kg of calcineurin produced for 15 min at 800 revolutions per minutes Ready glue was sent to the line for corrugated Board. Indicators of quality corrugated 3-layer cardboard presented in the table.

Example 2.

To 72 kg of native potato starch was administered 24 kg swelling corn starch, 1.8 kg of soda ash, 2 kg of calcium hydroxide and 0.8 kg of borax. The mixture was well mixed and diluted with water in a ratio of 1: 4. Mixing with water as in example 1. The quality indicators listed in the table.

It should be noted that as used starch adhesive prepared according to the conventional technology in the manufacture of corrugated cardboard, and analysis of indicators of the quality of the corrugated Board produced in accordance with TU 54-41-060-0027-89-59-00.

Thus, the use of glue with a stable set properties, prepared according to the invention provides good adhesion properties of the coating, the quality of corrugated cardboard. When this glue consumption is reduced and ranges from 10 to 12 g/m2three-layer cardboard, and heat and energy consumption reduced by 20%, the production area 2.5 times.

An additional advantage of the inventive method for the preparation of the adhesive is the possibility of its application in the course of commissioning the VA expensive automated chemistry departments in cooking of starch glue, large warehouses and handle large volumes of cargo handling.

Claims

1. Dry adhesive composition for preparing an adhesive for gluing of corrugated Board, comprising native starch, alkaline component, characterized in that it further comprises a water-retaining additives stabilizer swelling starch, and as the alkaline component oxide or calcium hydroxide and soda ash in the following ratio, wt.h.:
Native starch - 72-80
Swelling starch - 15-30
Soda ash - 1,8-2,0
The oxide or hydroxide of calcium - 2,0-4,0
2. Dry adhesive composition under item 1, characterized in that it further comprises borax at a rate of 0.8-1.0 wt.h.

3. The method of preparation of the adhesive for corrugated cardboard production by mixing with water starch with additives, characterized in that the first prepare a dry mixture by mixing native starch, swelling starch, soda ash, oxide or calcium hydroxide and borax, and before applying glue on the production line corrugated Board prepared dry mixture is mixed with water at a ratio equal to 1:(3,56) for whom the

 

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