A mixture of cationic starch, cationic galactomannan gum as a means conducive to giving strength and dehydration

 

Composition and its variants can be used as a means that can help give strength and dehydration in the manufacture of paper. Compositions include cationic starch, cationic galactomannan gum and acid. As cationic starch choose the starch from the group comprising starch, waxy maize, potato, corn, wheat and tapioca starch. Cationic galactomannan gum is chosen from the group comprising cationic harowuiu gum and gum carob and fenugreek Greek. As the acid used fumaric, citric, ascorbic, glycolic or lactic acid. Also applies to the method (and its variants) increase the strength in the dry state and/or obezvozhivanii paper products, including the preparation of an aqueous suspension of paper pulp, adding the above-mentioned composition in a suspension of paper pulp and making paper products in the form of a dry leaf. The technical result is to increase the strength of the paper. 8 C. and 26 C.p. f-crystals, 2 tab.

Technical field the Invention relates to mixtures of cationic starch with cationic galactogogue to be used as a means of conducive to giving strength and dehydration in the manufacture of paper.

Description of prior art In the paper industry as a means conducive to giving strength and dehydration, efficient use of cationic starch and cationic harowuiu gum. In the wet end of the papermaking machine, usually only add one of these products. Most commonly used cationic starch. However, there are reports of separate addition of these products to different parts of the paper machine. During the process of cationic starch to give strength usually added before. Cationic harowuiu gum add closer to the paper machine in order to ensure dewatering and retention of fibers.

To achieve the target of increasing the strength you can usually add up to 40 pounds of cationic starch. The number of input cationic Haraway gum is usually 1-8 pounds. Both products come in a paper mill in powder form. Cationic starch is usually suspended at a concentration of dry matter of 10-15% in water, heated to a high temperature, and before the may create certain problems, such as increased biological oxygen demand (BOD) and the accumulation of starch, reducing the effectiveness of the starch. Cationic harowuiu gum can be atomized with the help of eductor and dissolve in water at low concentration of dry substance, typically less than 1%. As in paper factories closed water systems, the availability of large quantities of fresh water necessary for the preparation of solutions Haraway gum, becomes increasingly difficult. Dust, which is associated with the use of powder on Haraway basis, also poses a health hazard that can lead to loss of hair and teeth and breathing problems. The cost of cationic Haraway gums and problems associated with it, limit its application in order to give strength to the paper.

In the patent US 4755259 (name Larsson) described the separate introduction of cationic starch, cationic gum and colloidal silicon dioxide in a papermaking machine. In this patent, however, does not describe how to add a papermaking machine the combination of a mixture of cationic starch with a cationic gum.

In the US 4927498 (in the name of Rushmere) described a separate introduction to bamidele Haraway gum, either cationic polyacrylamide and anionic polysilicate microgels. These cationic polymers are used interchangeably, and do not add together in the form of a mixture.

In K. E. Burnfield in "Application of New Gums for Enhancing Strength and Productivity", TAPPI Press, April 26, 1995, describes the use of cationic Haraway gums entered into the system for the manufacture of paper, which (system) include cationic starch, to improve the dewatering of this starch-containing system. This cationic harowuiu gum and cationic starch in the system for making paper is administered separately and not as a mixture.

Before the creation of the present invention are specialists, who know the chemical properties of starch and Haraway gum, believed that a dry mixture of cationic starch with cationic Haraway gum with a view to their introduction in a paper machine using known techniques, i.e. using dextrinization, involve technical difficulties or almost impossible.

Summary of the invention In accordance with this invention features a composition comprising cationic starch, cationic galactomannan increase the strength in the dry state and/or obezvozhivanii paper products, including aqueous suspension of paper pulp composition comprising cationic starch, cationic galactomannan gum and acid.

Moreover, to increase the strength in the dry state and/or obezvozhivanii paper products are also invited composition comprising aqueous suspension of paper pulp and a composition in which cationic galactomannan gum selected from the group comprising cationic harowuiu gum and carob bean gum, acid is a dry organic acid, the ratio between the cationic galactomannan gum and cationic starch is from about 1:4 to about 1:15, and the acid contained in such numbers, in which the pH of an aqueous solution of the composition is from about 8.5 to about 9.5 to.

One of the variants of the claimed compositions according to the present invention is a composition comprising the aqueous suspension of paper pulp and a composition in which cationic galactomannan gum is a cationic harowuiu gum, fumaric acid is an acid, and the ratio between the cationic galactomannan gum and cationic starch salt obezvozhivanii paper products, including the preparation of an aqueous suspension of paper pulp, adding to the suspension of paper pulp composition comprising cationic starch, cationic galactomannan gum and acid and production of paper products in the form of a dry leaf.

In addition, in accordance with the present invention, a method for increasing the strength in the dry state and/or obezvozhivanii paper products, including (1) preparation of an aqueous suspension of the composition, (2) the shutter speed specified aqueous slurry composition for a sufficient time and at sufficient temperature to dissolve the composition, (3) preparation of an aqueous suspension of paper pulp and (4) adding the dissolved composition in the aqueous suspension of paper pulp.

Moreover, as an aqueous suspension of the composition in the specified method used composition comprising kationaktivnaya starch, kationaktivnaya galactomannan gum and acid.

Another object of the invention is a method of increasing the strength in the dry state and/or obezvozhivanii paper products, including (1) preparation of an aqueous suspension of the composition, (2) extract aqueous slurry composition for a sufficient period reminisce and
(4) adding the dissolved composition in the aqueous suspension of paper pulp.

At the stage (1) in the preparation of an aqueous suspension of the composition use composition, in which the cationic galactomannan gum is chosen from the group comprising cationic harowuiu gum and carob bean gum, acid is a dry organic acid, the ratio between the cationic galactomannan gum and cationic starch is from about 1:4 to about 1:15, and the acid contained in such numbers, in which the pH of an aqueous solution of the composition is from about 8.5 to about 9.5 to.

Another object of the invention is a method of increasing the strength in the dry state and/or obezvozhivanii paper products, including
(1) preparation of an aqueous suspension of the composition,
(2) extract aqueous slurry composition for a sufficient time and at sufficient temperature to dissolve the composition,
(3) preparation of an aqueous suspension of paper pulp and
(4) adding the dissolved composition in the aqueous suspension of paper pulp.

To implement this method at the stage of (1) preparing an aqueous suspension of the composition in which cationic a fumaric acid, and the ratio between the cationic galactomannan gum and cationic starch is about 1:10.

Detailed description of the invention
The object of the present invention is a mixture comprising cationic starch, cationic galactomannan gum (such as Borisovna cationic husarova gum) and acid. This product is easy to handle and can be placed in solution with the use of conventional processing systems starch, which are currently available in paper factories. The present invention eliminates the preparation of a solution of cationic Haraway gums, which may be associated with danger and the need for water. The invention further allows to submit the paper machine solution mixed cationic Haraway gum and cationic starch. It was found that by adding the mixed product increases the strength of the paper in comparison with that achieved by introducing only cationic Haraway gum or cationic starch or introduction into the machine of cationic starch and cationic Haraway gum in separate points added. So far both products in od the production of paper pulp.

Cationic husarova gum is the most preferred cationic galactomannan gum for use in the present invention. Although in some cases the present invention is seen specifically in the example Haraway or cationic Haraway gum, to a person skilled in the art it is obvious that the same technology is applicable to galactomannan gums or cationic galactomannan gums in General.

In the art it is known that when the cationic harowuiu gum and cationic starch in the form of solutions individually introduced into the paper manufacturing process, they raise obezvozhivanii and strength of paper. We can assume that adding as cationic starch and cationic Haraway gum in paper manufacturing process would increase the strength and obezvozhivanii in comparison with achievable by the introduction of only one cationic starch or cationic Haraway gums. When creating the present invention, it was found that premixing cationic Haraway gums with cationic starch before the introduction of the paper machine increases the di and cationic starch without pre-mixing. Another important feature of the present invention is that when you blend increasing obezvozhivaniya, separate achieved by the introduction of cationic starch and cationic Haraway gum is retained. Moreover, it was found that the dry product comprising cationic harowuiu gum and cationic starch in the required ratios, can be prepared so that the mixture can be processed in the same way as the starch before the introduction of the paper machine. Before the creation of the present invention the viscosity, faced with the preparation of a mixture of cationic starch/cationic husarova gum, is too high for processing that is associated with the need to use expensive equipment and inappropriate demand for water.

Cationic galactomannan gum can be selected from the group comprising cationic harowuiu gum, gum carob and fenugreek Greek, preferred cationic galactomannan gum is a cationic husarova gum and cationic carob bean gum, the most preferred cationic what components Haraway gums chloride of hydroxypropyltrimethylammonium, obtained by the reaction of components Haraway gums with chloride of N-(3-chloro-2-hydroxypropyl)trimethylammonium, such as product Quat 188, manufactured by the Dow Chemical company, Midland, pieces of Michigan. As cationic Haraway gums may be used purified cationic husarova gum, such as product GalactasolSP 813D or mixture of cationic/anionic derivatives of the components Haraway gums, such as products AQU D-3376D and AQU D-3373D, manufactured by Hercules Incorporated. The value of the ratio between the remnants of the chloride of hydroxypropyltrimethylammonium and sharename links Haraway gums may be of 0.03 to 0.2, preferably 0.07 to 0.15 in. The reaction is carried out in the presence of water and sodium hydroxide. Either before the reaction, or after it, but before drying of the derived components Haraway gum add boron in the form of sodium borate, boric acid, borax or other water-soluble boron compound.

As cationic starch of the present invention, the use of starch, modified Quaternary ammonium. The starch may be a starch, waxy maize, potato, corn, wheat or mical Corporation, product STALOK400 firm of A. E. Staley Manufacturing Corporation, product ChargemasterR430 company Grain Processing Corporation. Preferred cationic starch is cationic corn, potato starch or maize starch waxy, and the most preferred cationic corn starch. The ratio between cationic Haraway gum and cationic starch in the composition may be at least about 1:1, preferably at least about 1:4, most preferably about 1:10. This ratio may be approximately 1:20, preferably about 1:15.

The acid can be any acid that may lower the pH of the final solution of cationic Haraway gum/cationic starch to about 7. For convenience, the preferred acid must be dry or powdered form. Acid particles can be any size, but such preferred particle size at which they pass through a sieve with cell size of 4 mesh, most preferably through a sieve with cell sizes of 100 mesh. Preferred is that the powdered acid, such as ascorbic acid, glycolic acid and lactic acid. The acid should be added in such a quantity, in which the pH of the solution of cationic starch, cationic Haraway gum and acid is at least about 7, preferably at least about 8.5. The content of the acid may be, in which the pH of the solution reaches about 10, preferably about 9.5 to.

The composition according to the present invention can be prepared separately by adding dry cationic starch, cationic Haraway gum and acid in the mixer and mixing. Alternatively, you can download and mix any two components with the subsequent addition of the third component. Dry mixing is preferable, because it allows full use of the advantages according to the invention with the convenience in the handling of such materials. Next, the dry mixture is suspended in water by the method and in concentrations that are similar to those applied to the currently used starch, which thereby eliminates the problems associated with the preparation of solutions Haraway gums. The suspension can be processed in the periodic processesfor over 100oWith under pressure. Methods of cooking are identical to those provided by the manufacturer of cationic starches in relation to the available starch. The resulting solution is easy to add in the paper machine, but it is usually diluted 10 times, in particular before adding.

Before adding it to the pulp can be mixed together in the above ratio (in terms of dry mass) solution of cationic starch cooked in the cooking process, and the solution of cationic Haraway gums.

Regardless of the method used in preparing solutions, the viscosity of the final solutions after cooking is the same. Also comparable properties get ready paper.

Below the invention is illustrated in the examples which do not limit its scope. In all cases, unless otherwise stated, all quantities are expressed in mass units or percent.

Example 1
In the mixer was loaded with 100 g of cationic Haraway gum GalactasolSP 813D and 900 g of cationic corn starch ChargemasterR430 and mixed to a uniform consistency. the different fumaric acid in the form of individual portions until, until the pH value reached to 9.5. This suspension with 10% dry matter content was kept at 50oC for 7 h, and noticeable increase in viscosity she did not show. Within 20 min, the suspension was heated to 100oC. was Noted a significant increase in viscosity.

Example 2
Worked analogously to example 1 by adding an additional amount of fumaric acid to reduce the pH to 8.5. When this did not observe any visible change to the results.

Example 3
Worked analogously to example 1 with the further addition of fumaric acid to reduce the pH to 7.5. In the period of aging at 50oWith noted a significant increase in viscosity. This increase in viscosity was due to solubility Haraway gum in the system and, probably, prevented the passage of a standard process of cooking starch.

Example 4
Worked as in example 1 except that the use of fumaric acid. As a result, the viscosity of the solution was found to be significantly lower than in examples 1, 2 and 3, indicating that the cationic husarova gum in the solution is not passed. Added fumaric acid to reduce the pH to 6.0. Celebrated viscosity equal to or greater than the viscosity in the examples 1, 2 and 3.

The example of a drainage vessel is a 3-element filter funnel Whatman size 12.5 cm equipped with hard ashless filter paper 541. Before laying into the funnel filter paper was dried and weighed. The funnel was placed in a vacuum flask connected to a vacuum pump and vacuum gauge. Prepared solutions of cationic corn starch Chargemaster R430 and cationic Haraway gum Galactasol SP 813S and mixed together in the same ratio as in example 1. The solution is pre-mixed cationic corn starch and cationic Haraway gums when the dry matter content of 1.1% in terms of dry pulp was introduced into 500 ml of a 0.2% suspension Kraft pulp. A suspension of paper pulp for 15 s was mixed with a solution of cationic starch and cationic Haraway gums. Before loading the suspension of paper pulp into the funnel the last was connected to a vacuum source. The funnel was loaded suspension. Recorded the time required for dewatering suspensions of paper pulp. The dehydration results are presented in table 1. The experiment was repeated with separate addition of cationic starch and/or cationic Haraway gums.

Example 6
Worked as in example 5, but replacing the mixed 226.gif">LOK400/cationic Haraway gum Galactasol SP 813D, prepared according to example 4.

Example 7
Worked analogously to example 6, in a mixture of reducing the starch content of 25% and adding 0.5% of mixed dry matter in terms of pulp.

Example 8
Worked analogously to example 5, increasing in the mixture, the content of cationic Haraway gum to 20% and adding a 1.25% mixed dry matter in terms of pulp.

Example 9
Worked as in example 5, replacing Kraft pulp neutral sulfite-pulp.

Example 10
Worked as in example 5, replacing Kraft pulp paper pulp corrugated cardboard old mailbox (GSA) (recycled cardboard boxes).

Example 11
Worked analogously to example 10, substituting the product Chargemaster R430 cationic potato starch STALOK 400.

Example 12
Strength characteristics was studied on paper canvas, made using the described in example 11 of mixtures of cationic Haraway gum/cationic starch. The casting was carried out using dynamic listonline forms of firm Paper Chemis is ulusu was diluted in 30-gallon tank to a concentration of 0.18% and were loaded into the mixer. Every blade of a 30-gallon tank took two litres of pulp and placed in the mixer. In the amount of 1.1% of dry matter in terms of pulp was added to a mixture of cationic Haraway gum/cationic starch. Pulp was placed in listonline shape and stirred propeller stirrer. The stirring speed of 1500 rpm was continued for 5 C. the rotation speed of the stirrer was reduced to 1000 rpm and was stirred for another 5 C. Next, the rotation speed of the stirrer was reduced to 400 rpm, then 1-inch agitator is raised, taking from a grid and open the drain valve for the water. The casting was shaped on the grid with a cell size of 70 mesh.

The casting was affected by the vacuum. The technology used was the impact on the casting vacuum of 20 inches of RT.article in the system before opening the valve. The valve is opened, removing from casting an additional amount of water. When the vacuum was decreased to 10 inches of RT.art., the valve was closed. Wet casting weighed and removed from the grid. The casting was placed between blotting papers and was pressed up to 1000 pounds. The sheets were dried on the floor of the drying cylinder at 250oWith and placed in a drying Cabinet. The leaves are cut on the floor of the results of determination of tensile strength are presented in table 2.

Example 13
Worked as in example 12, increasing the content of cationic Haraway gum in the mixture up to 20% with the addition of 1.25% mixed dry matter, calculated on dry pulp.

Example 14
Worked analogously to example 12 by replacing Kraft pulp unbleached Kraft pulp.

Example 15
Worked analogously to example 12 by replacing Kraft pulp paper pulp corrugated cardboard old mailbox.

Example 16
Worked analogously to example 15 with the substitution of the cationic potato starch STALOK400 cationic corn starch Chargemaster R430.


Claims

1. Composition comprising (a) cationic starch, (b) cationic galactomannan gum and (C) acid.

2. Composition under item 1, in which the cationic starch is chosen from the group comprising cationic starch, waxy maize, potato, corn, wheat and tapioca starch.

3. Composition under item 1, in which the cationic galactomannan gum is chosen from the group comprising cationic harowuiu gum and gum carob and p the powdered form.

5. Composition under item 1, in which the ratio between the cationic galactomannan gum and cationic starch is at least about 1:1.

6. Composition under item 1, in which the ratio between the cationic galactomannan gum and cationic starch is about 1:20.

7. Composition under item 1, in which acid is found in high number, in which the pH of an aqueous solution of the composition is at least about 7.

8. Composition under item 1, in which acid is found in high number, in which the pH of an aqueous solution of the composition reaches about 10.

9. Composition under item 1, which is a powder.

10. Composition under item 1, which is a solution.

11. The composition according to p. 2, in which the cationic galactomannan gum selected from the group including harowuiu gum and gum carob and fenugreek Greek, the acid is a water-soluble acid in powdered form, the ratio between the cationic galactomannan gum and cationic starch is from about 1:1 to about 1: 20, and the acid contained in such numbers, in which the pH of an aqueous solution composition of the present fumaric acid, citric acid, ascorbic acid, glycolic acid and lactic acid.

13. The composition according to p. 11, in which the cationic starch is chosen from the group comprising cationic corn, potato starch and maize starch waxy.

14. The composition according to p. 11, in which the cationic galactomannan gum is chosen from the group comprising cationic harowuiu gum and carob bean gum.

15. The composition according to p. 11, in which the acid is a dry organic acid.

16. The composition according to p. 11, in which the ratio between the cationic galactomannan gum and cationic starch is at least about 1:4.

17. The composition according to p. 11, in which the ratio between the cationic galactomannan gum and cationic starch is about 1:15.

18. The composition according to p. 11, in which acid is found in high number, in which the pH of an aqueous solution of the composition is at least about 8.5.

19. The composition according to p. 11, in which acid is found in high number, in which the pH of an aqueous solution of the composition is about 9,5.

20. The composition according to p. 13, in which the cationic galactomannan the TA is a dry organic acid, the ratio between the cationic galactomannan gum and cationic starch is from about 1:4 to about 1:15, and the acid contained in such numbers, in which the pH of an aqueous solution of the composition is from about 8.5 to about 9.5 to.

21. The composition according to p. 20, in which the cationic starch is a cationic corn starch.

22. The composition according to p. 20, in which the cationic galactomannan gum is a cationic harowuiu gum.

23. The composition according to p. 20, in which the acid is chosen from the group comprising fumaric acid, citric acid, ascorbic acid, glycolic acid and lactic acid.

24. The composition according to p. 20, in which the acid is a fumaric acid.

25. The composition according to p. 20, in which the ratio between the cationic galactomannan gum and cationic starch is about 1: 10.

26. The composition according to p. 21, in which the cationic galactomannan gum is a cationic harowuiu gum, fumaric acid is an acid, and the ratio between the cationic galactomannan gum and cationic starch is PR is s, including aqueous suspension of paper pulp and composition under item 1.

28. Composition for improving strength in the dry state and/or obezvozhivanii paper products, including aqueous suspension of paper pulp and composition on p. 20.

29. Composition for improving strength in the dry state and/or obezvozhivanii paper products, including aqueous suspension of paper pulp and composition on p. 26.

30. The way to increase strength in the dry state and/or obezvozhivanii paper products, including (1) preparation of an aqueous suspension of paper pulp, (2) adding the composition of p. 1 in a suspension of paper pulp, and (3) the manufacture of paper products in the form of a dry leaf.

31. The method according to p. 30, in which the paper product is made (1) by filtering the aqueous suspension of paper pulp with the formation of the paper web and (2) drying the paper web with getting paper products.

32. The way to increase strength in the dry state and/or obezvozhivanii paper products, including (1) preparation of an aqueous suspension of the composition under item 1, (2) aging the water suspension of the composition under item 1 for a sufficient time and at sufficient temperature to dissolve the composition, (3) preparation of an aqueous shall forward way to increase strength in the dry state and/or obezvozhivanii paper products, includes (1) preparation of an aqueous suspension composition according to p. 20, (2) aging the water suspension of the composition under item 1 for a sufficient time and at sufficient temperature to dissolve the composition, (3) preparation of an aqueous suspension of paper pulp and (4) adding the dissolved composition in the aqueous suspension of paper pulp.

34. The way to increase strength in the dry state and/or obezvozhivanii paper products, including (1) preparation of an aqueous suspension composition according to p. 26, (2) aging the water suspension of the composition under item 1 for a sufficient time and at sufficient temperature to dissolve the composition, (3) preparation of an aqueous suspension of paper pulp and (4) adding the dissolved composition in the aqueous suspension of paper pulp.

 

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