Compound for pulp materials hydrophobisation

FIELD: soft wares, paper.

SUBSTANCE: compound is intended for pulp materials hydrophobisation and can be used in pulp and paper industry and at paper and board manufacturing. Compound contains modified thallous galipot, paraffin, thallous fatty acids and balancer at defined components ratio. In the capacity of balancer sodium lauryl sulfate, sodium laureth sulfate, cocoamidopropylbetain or cocoamidopropylaminochloride is used.

EFFECT: compound refinement for hydrophobisation of pulp materials, supplying of its hydrophobization efficiency and storage life duration.

5 cl, 1 tbl

 

The invention relates to the pulp and paper industry and can be used in the manufacture of paper and cardboard.

Closest to the claimed is the glue for gluing (hydrophobization) cellulosic materials (Kermanian Hossein. New composite glue for sizing cellulosic materials: Diss. ... candles. technology. Sciences. - M: at MSFU, 2001. - 124 C.). The composition contains an unmodified tall oil rosin, distillirovannoi tall oil consisting mainly of fatty acids mixed with resin acids and hydrocarbons, and cationic starch. Tall products used in this composition are technical intermediates and have a low degree of purification. However, this source has mentioned the possibility of using such composition of modified tall oil rosin.

The disadvantages of this solution are: not a high water-repelling effectiveness; the use of the composition of the adhesive cationic starch, which significantly reduces the shelf life of the adhesive and leads to rapid biological damage; the use of the composition of the adhesive raw (unmodified) tall oil rosin and distilled tall oil, which reduces the whiteness of pulp material, leads to the deposition of particles coagulated resin on the equipment, the formation on the surface of the paper sheet with alanah spots ("pitch problems"), "posting" (loss of hydrophobicity) of cellulosic material over time; significantly reduced mechanical strength and whiteness of the pulp material.

The problem solved by this invention is as follows: high water-repelling efficiency; use of tall oil products in the composition of the composition without the appearance of "pitch problems" in forming cellulosic material; minor influence of composition on white and the mechanical strength of the cellulose material; long term storage.

The solution of this problem is provided by the fact that the composition for waterproofing cellulosic materials are used rosin tall oil modified, paraffin, tall oil fatty acid (as potassium or sodium Soaps) and a stabilizer, which can be used sodium lauryl sulphate, sodium Laureth sulphate, cocamidopropylbetaine or cocamidopropylbetaine, in the following ratio, wt.%:

Rosin tall oil modified33-34
Paraffin16-17
Tall oil fatty acids33-34
Stabilizer16-17

The technical essence of the invention consists in the following:

The main hydrophobic basis of the developed composition are tall oil rosin modified (modifier - maleic anhydride) and paraffin. Rosin tall oil modified often used for waterproofing cellulosic materials, however, the aqueous dispersions are difficult to prepare and low stability, and in the form of sodium soap of this rosin is not effective enough and has a high sensitivity to water hardness salts. In the developed part of tall oil rosin is modified in dispersed form. Use tall oil modified rosin production Solombala PPM (Arkhangelsk).

The wax gives a cellulosic material with a high hydrophobicity and increases its some operational properties, but the high content adversely affects the mechanical strength. In addition to strengthening the hydrophobic performance of the developed composition, paraffin facilitates the dispersion of the tall oil-modified rosin.

Fatty acids of tall oil is a mixture of unsaturated and saturated higher fatty acids range From10-C22and have an average gidrofobiziruyuschey efficiency in relation to the cellulosic material, significantly inferior to the effectiveness of the tall oil rosin modified and paraffin. In R srabotanno composition, in addition to the function of additional water-repellent, they play the role of stabilizer dispersed particles tall-modified rosin and paraffin. Use tall oil fatty acid production Solombala PPM (Arkhangelsk).

Stabilizers that can be used in the proposed structure, have very low water-repelling performance, but without them it is impossible to stabilize the dispersed particles of rosin. Their stabilizing effect similar physico-chemical mechanism. For preparation of a composition as stabilizers can be used:

Sodium lauryl sulfate, CH3-(CH2)10-COSO3Na. Has a good stabilizing effect, not hydrolyzed, is not oxidized. Recommended primarily for use in the composition for waterproofing paper from 100% cellulose, for which one the "whiteness".

Sodium Laureth sulphate CH3-(CH2)4-CH=CH-(CH2)4-SO3Na. Its stabilizing effect more reliably, so use implies less stringent requirements to the technological mode of preparation of the composition in comparison with lauryl sulfate. Not hydrolyzed, however, the presence of double bonds in the molecule makes it prone to oxidation over time. It is recommended to use the cation in the composition for waterproofing paper, containing wood pulp, unbleached pulp.

Cocamidopropylbetaine is a betaine-based amides of fatty acids of coconut oil. He has on aqueous dispersions of rosin enough good stabilizing action, not prone to hydrolysis. Because it is produced from a mixture of various fatty acids, including anisidine, therefore, contains impurities, is subjected to oxidation over time. For example aminopropylation stearic acid, its formula is as follows:

where R=H;

-CH3;

-C2H5;

n = often 2-4.

Cocamidopropylbetaine recommended for the stabilization of compositions intended for waterproofing paper, the composition of which is the secondary fibrous raw materials (in combination with fresh fiber or 100%).

Cocamidopropylbetaine is a (technical) product is a mixture of salts chetyrehzaryadnyh ammonium bases on the basis of fatty acid amides of coconut oil. We also started production of these products a high degree of purification on the basis of stearic or palmitic acids. For example, stearic acid, its formula is as follows:

Cocamidopropylbetaine recommended for the stabilization of compositions intended for g is kotobatachi paper and cardboard produced their secondary fibrous materials with strongly closed water recycling system and a high cationic demand of paper pulp. Gives the possibility to obtain dispersions with positively charged particles with a high potential for sedimentation to the negatively charged cellulosic fiber. Technical products can be used in the processing of dark paper, peeled white parchment paper.

In the proposed gidrofobiziruyuschey part used stabilizers production of Henkel, Germany.

Developed hydrophobic compound is a complex, multi-component dispersion, the particle size of which can vary from colloidal (<0.1 ám) to microheterogeneous (>1 μm) with an average size of about 1 μm (at a concentration of 1% or less). At a concentration of >25% dispersion is a solid gel with mild fluid properties, which upon dilution and mixing again restores liquid dispersed state.

The invention is illustrated by the following example:

1. Technology of preparation of water-repellent composition in laboratory conditions

The components of the composition. Rosin tall oil modified (KTM) 10 g (33,3%); paraffin (P) - 5 (16,7%) g; fatty acids of tall oil (GCTM, in the form of a potassium soap) - 10 (33.3%) of g; one hundred is ilitator (St) - 5 g (16.7 per cent). As a stabilizer may be used any of the above. View of the stabilizer does not affect the ratio of the components, the technological mode of its preparation and rheological properties.

The method of preparing the composition. ICTM loaded into a pre-weighed beaker of 250 ml, add about 150 ml of distilled water, placed into a water bath, turn up the heat and stirring with a mechanical stirrer. The temperature in the glass should be gradually increased (10 min).

This was followed by saponification, loading in the same glass solid line in the amount required for complete saponification ICTM (CZK for GCTM take 200 mg KOH/g). Almost complete saponification ICTM requires excessive CON about 20% due to partial hydration COHN and his transition in To a2CO3when stored at ambient temperatures and hydrolysis produced during the saponification salts. The pH value of the solution is completely smilanich ICTM should be about...8,5 8,0 (blue-green colour of the universal indicator paper). Then injected into a glass Article, and the temperature in the glass is brought to 85...90°With (15 min).

The mixture of solid KTM and P is placed in a porcelain container and heated in an open flame until complete fusion of the components with the formation of a homogeneous oily melt (t≈120°). The melt is gradually introduced into the TACAN with saponified GCTM and Art. The sharp entry of the total weight of the melt can lead to boiling mixture and splash her through the walls of the Cup (10 min).

1...2 min after introduction of the mixture KTM and P in the glass of a homogeneous yellow-brown dispersion. This was followed by intensive mixing at a temperature of 85...90°for at least 40 minutes It is necessary to form a homogeneous dispersion (45 min).

To obtain the dispersion concentration (25% or more) produce evaporation under the same conditions (see above). Typically, the evaporation is terminated by a strong increase in the viscosity of the dispersion, which complicates it further stirring (>30%) (1...2 h).

Upon reaching a specific viscosity of dispersion (mixing is still possible, but is already becoming difficult), the heating is switched off, the hot water of the water bath is drained, then fill it with cold water. After 5 min operation is repeated (only 4-5 times). It is necessary for the gradual cooling of the finished dispersion. The process finishes when the temperature of the finished dispersion of about 35°With (30 min).

The total duration of the process is about 3 to 4 hours (depending on the desired concentration of the finished part).

2. The technology of using water-repellent composition in the manufacture of paper

Made offset paper No. 1 weight of 70 g/m2the ash content of 10% with the following composition fiber: cellulose sulphate bleached coniferous - 50%, the degree of grinding - 30°SR; cellulose sulfate bleached hardwood - 50%, the degree of grinding - 32°SHR. Manufacturer of offset paper No. 1 on laboratory listonline apparatus includes the following steps:

1. The dissolution of the fibrous material (cellulose) in water to form a water-fiber suspension.

2. Introduction to water-fiber suspension of mineral filler (kaolin).

3. Introduction to water-fiber suspension chemical additives in the following order and with the following expenditure on the dry matter: of cationic starch, 5 kg/t; hydrophobic compound (or composite adhesive nearest equivalent) - 10 kg/t; aluminum sulfate - 30 kg/so

4. Adjustment of the pH of the aqueous fibrous suspension by the addition of sulfuric acid or sodium hydroxide to the desired value (pH 6.5).

5. The forming of the paper web, which consists in filtering the water-fiber suspension through a grid ostatniego apparatus with education on the net wet paper web.

6. Pressing the paper web, which consists in mechanical wringing the water out using a special cushion.

7. Drying the paper web at a temperature of about 95°C for 7 minutes.

Properties of offset paper produced using the proposed composition and the closest analogue is presented in the table.

Table
Properties offset paper
Compound for the treatmentName of indicator
Breaking length, mThe degree of sizing, mmSurface absorption, g/m2Blagorodnost, %Plucking, m/sFracture, CDP
Without chemicals40000,27052,04
The proposed composition39002,01082,24
The closest analogue37001,751461,83

These tables indicate that the use of the developed water-repellent composition has expressed no negative effects on physico-mechanical properties of offset paper. With a slight decrease of the breaking length slightly increasing the resistance of the surface to plucking, which is important in offset printing.

When using the nearest equivalent to his negative influence on all the basic properties of offset paper much more pronounced. By offering the first new hydrophobic compound will make it possible to eliminate this negative impact and to improve the process of paper production.

1. Composition for waterproofing cellulosic materials, including tall oil rosin modified, paraffin, tallow fatty acid, characterized in that the composition additionally contains a stabilizer in the following ratio, wt.%:

Rosin tall oil modified33-34
Paraffin16-17
Tall oil fatty acids33-34
Stabilizer16-17

2. The composition according to claim 1, characterized in that the stabilizer is used as sodium lauryl sulfate.

3. The composition according to claim 1, characterized in that the stabilizer is used as sodium Laureth sulphate.

4. The composition according to claim 1, characterized in that the stabilizer is used as cocamidopropylbetaine.

5. The composition according to claim 1, characterized in that the stabilizer is used as cocamidopropylbetaine.



 

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