The composition for sizing fibrous materials


D21H17/64 - Alkaline compounds

 

(57) Abstract:

The essence of the invention: adhesive composition contains prolam-product of the distillation of crude tall oil hardwood with a mass fraction of the amount of fatty and resin acids and neutral substances 70 to 80, an acid number of 130 - 145 mg KOH/g and a softening temperature of 35 to 50C. the Composition contains the following components, wt.%: Prelom 8 - 10, alkali 1,0 - 1,3, water the rest. 3 table.

The invention relates to the pulp and paper industry, and in particular to compositions for sizing fibrous materials, in particular cardboard, bags and wrapping paper.

Known composition for sizing fibrous materials, in particular paper, on the basis of paraffin and synthetic fatty acids (1).

Structures on the basis of paraffin and synthetic fatty acids have insufficient stability of the dispersion, and the paper which is coated with such a composition has a relatively low adhesive strength.

Also known composition for sizing presented in the method of preparation of adhesives for cellulosic materials containing sulfate lignin, tall oil, alkali and hypochlorite (2).

However, this composition, soderzhashchaia sodium to 8-25%.

Closest to the claimed composition for sizing fibrous materials is part of the known method of sizing fibrous materials in the mass, where as a sizing agent use tall oil hardwood and alkali (3).

The main disadvantage of this composition for sizing is that this composition can be used only with prior treatment of fibrous materials dispenser - thermalization biomass of activated sludge, otherwise avoid resin inclusions in cardboard and resin deposits on the equipment difficult. However, treatment with dispersant provides enough stability sizing because it disperses mainly of the resin particles in the fibrous mass, but not in a sizing agent.

The task of the invention is to improve the degree of sizing fibrous materials in bulk at lower glue consumption and ensure optimal stability of the adhesive emulsion, an exception resin deposits on the equipment and cardboard.

The invention consists in that the composition for sizing fibrous materials containing Klooga oil hardwood with mass fraction of fat, resin acids and neutral substances 70-80%, acid number 130-145 mg KOH/g and a softening temperature of 35-50aboutWith the following ratio of components, wt.%: Prolom 8-10 Alkali 1,0-1,3 Water the Rest

Prolem is the product of distillation of crude tall oil hardwood with a mass fraction of the amount of fatty and resin acids and neutral substances 70-80% , of which removed light oils, volatile fatty acids and a large part of unsaponifiable substances. Prolam - vitreous mass, with a softening temperature of 35-50aboutC, acid number 130-145 mg KOH per 1 g of the product mass fraction of ash is 0,03-0,06%. Unsaponifiable substances, which are the main cause of pitch deposits on equipment and paperboard, in proleme contains 8-12% vs. 18-26% in the crude tall oil hardwood, i.e. 2-3 times less. And reduced to 2-3 times the content of unsaponifiable substances excludes resin deposits on the equipment and in the cardboard, which significantly improves the quality sizing.

In the prototype as to prevent the resin deposits required before the introduction of glue to hold a special processing of the fibrous mass of the dispersant.

As for the glue consumption 1 ox is nice. The stability of the adhesive on the basis of prosoma high at 96-120 h, which is optimal for a given composition, with the adhesive particles are evenly distributed between the fibers, interact well with alumina, providing high effect sizing.

Thus, our studies revealed that the low content of unsaponifiable substances in polome (compared to crude tall oil hardwood) provides a significant reduction (37 times) glue consumption, improving quality, sizing and contributes to greater stability of the adhesive emulsion.

In addition, the inventive adhesive composition can be uniformly distributed in the fibrous mass, which provides stability and a high degree of sizing.

We are not aware of the technical solutions that involve the use of prosoma as the basis of composition for sizing fibrous materials in the mass.

First prolem was obtained on pilot installation of concern Bratsk LPK, temporary technical specifications OP13-4302007-031-92. A sizing composition "PROLOM approved by the Vice-President of the concern of the Bratsk LPK Bogdan C. M., 27 March 1992

Will vistaprint claimed the new properties, to reduce glue consumption while ensuring the uniformity of sizing fibrous materials in the mass, to improve the quality of sizing and exclude tar deposits on the equipment and cardboard.

Composition for gluing cardboard prepared as follows. In the emulsifier with constant stirring pour the water, download the alkali and prolom. The temperature in the emulsifier raised to 70aboutC and maintained for 30 min without mixing. Upon completion of the reaction, the obtained adhesive emulsion diluted with cold water to a concentration of 20-30 g/l and used for sizing.

Technology of preparation of the composition for sizing fibrous materials is confirmed by the following specific embodiments of the invention.

Preparation of castings cardboard, drying, conditioning and the test is carried out according to GOST 7420-89 "Cardboard for flat layers of corrugated cardboard".

P R I m e R 1 (prototype).

The composition for sizing paperboard, containing (wt.% tall oil hardwood 10, alkali 0.8 and water 89,2, is prepared at a temperature of 70aboutC for 30 min with constant stirring. The obtained adhesive emulsion is diluted with cold Kappa, treated with thermalization biomass of activated sludge in the amount of 2.0% by weight of absolutely dry fiber, and introduce a sizing composition at the rate of 1.5% (15 g/kg) to absolutely dry fiber, add precipitator - aluminum sulfate to a pH of 4.5. From the prepared cellulose doing castings weighing 150 g/m2, dried in the chamber ostatniego apparatus for 3 min, at a temperature of 80-90aboutWith, then in a drying Cabinet at a temperature of 130-140aboutC for 30 minutes, Dried casting condition and experience according to GOST 7420-89 "Cardboard for flat layers of corrugated cardboard". When this air conditioning castings cardboard is carried out at a temperature of 23aboutC and humidity of 50%, and in the prototype (ed. St. N 1714015) air castings before the test is carried out at a temperature of 20aboutC and humidity of 65% - i.e. old GOST (7420-78) "Cardboard for flat layers of corrugated cardboard".

Therefore, when obtaining comparable results sample castings cardboard obtained from the sizing composition of the prototype and the claimed invention were tested in the same conditions on the new GOST 7420-89, introduced with effect from 01.01.91,

The test results of samples of cardboard prototype (GOST 7420-89) are presented in table. 1.< contains prolom in the amount of 7.0%, alkali 1.1% 91,9% water.

Prolom used in the adhesive composition has the following characteristics: fraction of total mass of fatty and resin acids and neutral substances is 72%, an acid number of 130 mg KOH/g and a softening temperature 35aboutC.

In a thermostatted glass with a volume of 2 l with agitator pour 919 ml of water, making 11 g of sodium hydroxide and stirring enter 70 g of prosoma, the temperature is brought to 70aboutC and under stirring with a sizing composition of the stand 30 minutes At the end of the process, the adhesive is diluted with cold water to a concentration of 20 g/l and used for sizing.

For experience use unbleached sulfate pulp after washing with hardness of 50 Kappa. The pulp mass is ground in a laboratory mill to a degree of grinding of the 36aboutSHR. Milled mass is diluted with water to a concentration of 2.5%, give it prepared a sizing composition (in the form of saponified prosoma) in an amount of 0.4 g/kg to absolutely dry weight of the fiber and continue stirring for 10 minutes, after this time the mass is diluted with water to a concentration of 0.5% on absolutely dry fiber and for the deposition of the adhesive particles on the fibers enter sulfate alumina (or other soulive on listonline apparatus, get castings weighing 150 g/m2and a thickness of 0.25 mm, the Drying of the samples is carried out in the drying chamber ostatniego apparatus for 5 min, then in a drying Cabinet at a temperature of 130aboutC for 30 minutes

The dried casting cardboard condition and experience according to GOST 7420-89 "Cardboard for flat layers of corrugated cardboard". The results of the tests are presented in table. 1.

P R I m e R 3. The experience carried out analogously to example 2. Composition for gluing cardboard contains prolom in the amount of 8.0%, the alkali 1.1% and water 90,9%.

Prolam - product of the distillation of crude tall oil hardwood contains 72% of fatty and resin acids and neutral substances, the acid number of 130 mg KOH/g and a softening temperature of this sample 35aboutC.

In the experiment example 3, the flow sizing agent is 0.2, and 0.4, 0.6 and 0.8 g/kg to absolutely dry weight of fiber.

The results of the tests are presented in table. 1 and table. 3.

P R I m e R 4. The experience carried out analogously to example 2. Composition for gluing cardboard contains prolom in the amount of 8.5%, the alkali 1.1% and water to 90.4%. Prolom, part of the glue that has the following characteristics: fraction of total mass of fatty and resin acids and neutrali castings cardboard are presented in table. 1.

P R I m e R 5. The experience carried out analogously to example 2. Composition for gluing cardboard contains prolom of 9%, the alkali 1.1% and water to 89.9%. Prolom used to prepare the composition for sizing fibrous materials, characterized by the following parameters: fraction of total mass of fatty and resin acids and neutral substances 76%, acid number 137 mg KOH/g and a softening temperature 42aboutC.

In the experiment example 5 flow sizing agent is 0.2, and 0.4, 0.6 and 0.8 g/kg to absolutely dry weight of fiber.

The results of the tests are presented in table. 1 and 3.

P R I m e R 6. The experience carried out analogously to example 2. The composition for sizing contains, wt%: prolom 10, alkali 1.1 and water 98,9.

Prolom used in this experience, contains fatty and resin acids and neutral substances 78%, an acid number of 145 mg KOH/g and a softening temperature 40aboutC.

In the experience of consumption, a sizing agent is 0.4 g/kg to absolutely dry weight of fiber.

The results of the tests are presented in table. 1.

P R I m e R 7. The experience goes beyond the proposed technical solution. The experience carried out analogously to example 2. The composition for sizing contains, wt%: prolom 11, the data resin acids and neutral substances 78%, the softening temperature 40aboutC.

Consumption sizing composition of 0.4 g/kg of absolutely dry mass (and.with.M.) the fiber.

The results are presented in table. 1.

The results of the experiments presented in the table. 1, show that the use of the adhesive composition on the basis of prosoma can improve the degree of sizing in 1,5 times in comparison with the prototype, which use a glue based on crude tall oil hardwood. Glue consumption on the basis of prosoma reduced in 37 times compared to the prototype. This improves the physico-mechanical parameters of cardboard: the punching shear resistance of 6.0 to 8.0%, destructive force when compressed by 19.0%.

The best results according to the degree of sizing and lack of sediment obtained by using the composition for sizing, containing prolom 8-10 wt.%, and when the glue consumption 0.4 g/kg to absolutely dry fiber.

It should be noted at this high resistance of the adhesive from 96 to 120 hours

The decrease in the mass fraction of prosoma to 7% increases the resistance of the adhesive, but this reduces the absorption of water by Kobu to 30 g/m2the degree of sizing falls, worse physical and mechanical properties. cardboard and resin deposits on the equipment. The glue turns coarse, its resistance drops to 72 h, decreases the degree of sizing.

P R I m e R s 8-11. Experiments are performed analogously to example 2.

In examples 8-11 in the composition for sizing change the content of alkali from 0.9 to 1.2%, mass fraction of prosoma is not changed.

The composition for sizing in the experiments 8-11 contains prolom 9%, the alkali content is 0.9, and 1.0, 1.1 and 1.2, the addition of water is 90,1, 90,0, 89,9 and 89,9 respectively. Consumption sizing composition of 0.4 g/kg to absolutely dry weight of fiber.

The results of the tests are presented in table. 2.

P R I m e R 12. The experience delivered analogously to example 2.

Composition for gluing cardboard contains (wt.%) prolom 9, alkali 1.3 and water 89,7.

Prolom used to prepare the adhesive, characterized by the following parameters: mass fraction of fatty and resin acids and neutral substances 80% , an acid number of 145 mg KOH/g and a softening temperature 50aboutC. Consumption sizing composition of 0.2, and 0.4, 0.6 and 0.8 g/kg to absolutely dry fiber.

The results of the experiments are presented in table. 2 and 3.

P R I m e p 13. The experience goes beyond the proposed technical solution.

Composition for gluing cardboard with the substances of 80%, acid number 145 mg KOH/g and a softening temperature 50aboutC.

The results are presented in table. 2.

As follows from the data table. 2 the best results according to the degree of sizing and lack of resin inclusions obtained by using the composition for sizing on the basis of prosoma alkali in amount of 1.0-1.3 wt.%. The stability of the adhesive at high 96-120 hours With the introduction of alkali 0.9% in the composition for sizing adhesive is obtained coarse, the stability of the entire 72 h, after this time its partial stratification. Absorption of water by Kobu samples of cardboard which is coated with adhesive such composition, high 30 g/m2the degree of sizing low. Due to insufficient quantity of alkali in the composition for sizing equipment and cardboard are resin deposits.

With an excess of alkali in the composition for sizing, i.e., higher than 1.3 wt.%, physico-mechanical properties of samples of cardboard worse. The degree of sizing low. The excess alkali changes the pH with the sizing and worsens the terms of sizing. The alumina thus reacts badly with adhesive particles and not evenly disperses them, the result is insufficient glued cardboard.

on.

As follows from the data table. 3 the best results according to the degree of sizing obtained by glue consumption 0.4 g/kg to absolutely dry fiber. In all experiments, improved physical and mechanical properties of cardboard - resistance bursting at 7-8% and destructive force in compression on 17,0-19,0%. Glue consumption according to the claimed technical solution at 37 times less compared to the prototype.

The results of the experiments presented in the table. 1, 2, 3, show that the composition for sizing fibrous materials on the basis of prosoma - product of the distillation of tall oil hardwood allows you to improve the degree of sizing, i.e., to reduce surface absorption of water by Kobu upper hand in 1.5 times, to improve physical and mechanical properties of cardboard, to reduce glue consumption in 37 times in comparison with the prototype, to eliminate formation of pitch deposits on equipment and cardboard.

The application of the proposed technical solutions will allow you to:

to expand the range of adhesives for gluing fibrous materials in bulk and create the possibility of replacing expensive adhesives based on rosin, which is currently used on the majority of cardboard production;

Ross preparation of a composition for sizing agents, obtained directly in the pulp and paper mills.

The COMPOSITION FOR SIZING FIBROUS MATERIALS containing an adhesive substance, alkali and water, characterized in that it as adhesive contains prolam - product of the distillation of crude tall oil hardwood with a mass fraction of the amount of fatty and resin acids and neutral substances 70 - 80%, an acid number of 130 - 145 mg KOH/g and a softening temperature of 35 - 50oWith the following ratio of components, wt. %:

Prelom 8 - 10

Alkali 1,0 - 1,3

Water The Rest

 

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