The composition is used as a filler for paper production, and method for producing paper

 

(57) Abstract:

The invention relates to compositions containing micronized particles of inorganic material treated with a derivative of cellulose or cellulose, modified by at least one ionic or Deputy containing ion such Deputy. Alkaline paper according to the invention contains a cellulose fiber and the above-mentioned composition, which is the filler. The method of obtaining the paper includes the processing of fine particles of inorganic material derivative of cellulose modified by at least one ionic Deputy, or contains such Deputy, adding the treated particles to the cellulose fiber during the alkaline method for the production of paper. The result of this invention is to increase the degree of whiteness of paper, 4 C. and 30 C.p. f-crystals, 4 tab., 4 Il.

The invention relates to improved fillers for paper and alkaline paper, incorporating such fillers. This invention relates to a method for producing paper, in particular to methods of producing paper using fillers.

Background of the invention.

During production of alkaline paper to a and/or pescatelli usually add fillers of inorganic materials. The fillers used in the production of alkaline paper, are inorganic materials. In the production of alkaline paper use the maximum amount of filler, because increasing the amount of filler in this production leads to reduction of production costs. In addition, the filler provides superior properties of alkaline paper, such as the coefficient of opacity and whiteness.

Whiteness is a function of the reflectivity. Inorganic materials, such as chalk, talc and clay, provide a low degree of whiteness. It is known that the degree of whiteness attached clays can be improved by annealing. However, the calcined clay is an abrasive material that is unwanted.

The degree of whiteness of the base paper, which contains inorganic fillers, which have a low degree of whiteness can be improved by incorporating fluorescent brighteners or optical brighteners. However, these chemicals are expensive and give rise to concerns about the protection of the environment.

In this on the go stable dispersion of silica in solutions of simple esters of cellulose, which are useful as compositions for Litovka.

In U.S. patent N 3730830 presents a method for the production of paper having high strength, which form the suspension staple fiber, carboxymethyl cellulose and inorganic pigment, followed by the addition of cellulose fibers.

In U.S. patent N 4310360 presents a method of obtaining a composition for Litovka comprising heating the pigment in the presence of the polysaccharide.

In U.S. patent N 4210488 describes how to improve the effect of optical brighteners by absorption of paliperidonesee adsorbed on the carboxymethylcellulose.

Carboxymethylcellulose is an additive for wet end of the paper, which improves the strength of the paper in a dry condition. To improve surface strength, smoothness and absorbency of oil or grease on the surface of the paper can be also applied solutions of carboxymethylcellulose.

None of the above patents describes a successful resolution of the problem of improving the degree of whiteness of the products of the alkaline paper that contain fillers of the type of inorganic pigments. Accordingly existence is izgotovlenie using alkaline paper.

The invention

The presented invention relates to an inorganic filler treated with a derivative of cellulose. The derivative of cellulose is preferably modify at least one ionic Deputy, for example sodium, or it contains this ion Deputy.

The presented invention relates, furthermore, to a method of providing alkaline paper improved degree of whiteness. The method includes providing a fine-grained inorganic filler, processing of filler derivative of cellulose, which is modified by at least one ionic Deputy or contains such ionic Deputy, and adding the treated filler during the alkaline method for the production of paper pulp and fiber.

The invention relates also to alkaline paper, incorporating the treated filler.

Suitable inorganic materials that can be processed in accordance with the invention, include minerals such as titanium dioxide, carbonates of alkaline earth metals, such as natural and precipitated calcium carbonate ("PCC"), clay, talc, alumina trihydrate, aluminum silicate of sodium, and zinc sulfide. Site Is/P> Derivatives of cellulose, used for processing of inorganic materials, can be salts of cellulose, i.e., cellulose, modified by at least one ionic Deputy, or cellulose containing ion such Deputy. The derivative of cellulose is preferably a sodium carboxymethyl cellulose ("CMC"), where the carboxymethyl cellulose has a degree of substitution of around 0.70 and a viscosity of about 25 centipoise to about 50 centipoise, as measured on the Brookfield viscometer. The sodium carboxymethyl cellulose with a specified degree of substitution available from Aqualon Co., Wilmington, DE (Aqualon. Co., Wilmington, DE).

According to another aspect, the invention is directed to an improved method for the production of alkaline paper in which the cellulose and inorganic material turn in the alkaline suspension is dewatered and formed into paper. The method includes providing a fine-grained inorganic material, the processing of inorganic material derivative of cellulose modified by at least one ionic Deputy, and mixing the treated inorganic material with cellulose fiber to provide a suspension suitable for molding into the paper.

Treatment is of sodium carboxymethyl cellulose ("CMC"), such as dry CMC or CMC in the form of an aqueous solution, preferably dry CMC. The processing stage involves mixing the inorganic material and the CMC during the time from 1 minute to 6 hours, preferably from about 15 minutes to 3 hours at a temperature of from 5 to 95oC, more preferably at a temperature of from 20 to 60oC.

Another aspect of the invention relates to an improved alkaline paper. Alkaline paper comprises cellulose fiber and the above-mentioned fine particles of inorganic material treated with the above-mentioned cellulose derivative.

Fig. 1 shows the degree of whiteness of the paper in accordance with TAPP1 (Technical Association of the pulp and paper industry) examples 1A-1H.

Fig. 2 shows degree of whiteness of the paper in accordance with TAPP1 examples 2A-2P.

Fig. 3 shows degree of whiteness of the paper in accordance with TAPP1 examples 3A-3H.

Fig. 4 shows degree of whiteness of the paper in accordance with TAPP1 examples 4A-4D.

Detailed description of the invention.

Typically, the treated inorganic filler of the invention is produced by mixing finely ground inorganic material derived from the Zell is th ion Deputy. The derivative of cellulose is preferably carboxymethy cellulose ether, which has a sodium Deputy, i.e., CMC. CMC has a viscosity of from 25 to 50 centipoise in a 2% aqueous solution and may have a degree of substitution (average number natrocarbonatite groups to link anhydroglucose) of about 0.70. Other suitable cellulose derivatives include oxidized or anionic starches.

Inorganic material that can be used in the invention as fillers may be any inorganic material that is normally used as a filler in paper manufacture. These inorganic materials are usually calcium carbonate, clay, titanium dioxide, talc, alumina trihydrate, aluminum silicate of sodium, zinc sulfide, etc., the calcium Carbonate may be either natural, such as calcite, chalk, or precipitated calcium carbonate. Most preferred is a precipitated calcium carbonate ("PCC").

The average particle size of inorganic material usable in the invention is from about 0.1 to 5 μm, preferably from about 0.2 to 3.0 microns. The average particle size is determined in the form of equivalent spherical diameter to the oil, processed CMC suitable in the invention can be carried out by any method (A) method (B) method (C) or method (D). In method (A) dry powder cellulose derivative, such as CMC, is added to aqueous suspension which has from about 5 to about 75% by weight, preferably from about 10 to about 30% by weight of inorganic material in the form of solid particles. Suspension and CMC powder mixed in a period of time from about one minute to about 6 hours, preferably from about 15 minutes to about three hours. The temperature during the addition of CMC is usually from about 5 to about 95oC, preferably from about 20 to about 60oC, most preferably about 25oC.

In method (B) an aqueous solution of the derivative of cellulose, such as CMC, is added to aqueous suspension which has from about 5 to about 75% by weight, preferably from about 10 to about 30% by weight of inorganic material. Suspension of inorganic material and the CMC solution is mixed for a time from about one minute to about six hours, preferably from about 15 minutes to three hours. The temperature during the addition of CMC solution is usually 5 - 95oC, preferably from about 20 to about 60oC, the most is Astaro derivative of cellulose, for example CMC. Inorganic material and the CMC solution is mixed for a time from about one minute to about six hours, preferably from about 15 minutes to about three hours. The temperature during mixing is usually from about 5 to about 95oC, preferably from about 20 to about 60oC, most preferably about 25oC.

In method (D) an inorganic material treated with CMC by adding dry powders CMC and finely ground inorganic material to the water. In this way the CMC, an inorganic material and water are mixed from about one minute to about six hours, preferably from about 15 minutes to about three hours. The temperature during mixing can be 5 - 95oC, preferably from about 20 to about 60oC, most preferably about 25oC.

The number of CMC added to each of the above methods, is sufficient to ensure the inorganic material having from about 0.01 to 5% by weight of CMC, preferably from about 0.05 to 0.5%. Suitable aqueous solutions of CMC have from about 0.1 to 5% by weight of CMC in the aqueous phase, preferably from about 0.5 to 1.5% by weight in the aqueous phase, most preferably about 1% by weight relative to voina by adding finely ground inorganic material, processed above a derivative of cellulose, the cellulose fiber during production of alkaline paper. Other uses of the treated filler of the invention include their use as pigments and fillers in cement, plastics, rubber, paints and medicines.

Alkaline paper of the invention includes cellulose fiber and a filler consisting of a finely ground inorganic material treated with the above-mentioned cellulose derivative. The treated inorganic filler may be present in an amount of from about 5 to 45% by weight relative to the paper.

The above-mentioned features, aspects and advantages of the present invention will become more apparent from the subsequent non-limiting examples of the present invention.

Examples 1A-1H.

Examples 1A-1F show the effect on the degree of whiteness achieved through the application of PCC filler modified with different doses of sodium carboxymethyl cellulose. For comparison examples 1G and 1H show the effect on the degree of whiteness achieved through the application of filler raw PCC.

In examples 1A-1F aqueous suspension, the soda is (B). PCC has a scaly structure, the average particle size of 1.4 microns and a specific surface area of 12.3 m2/year Quantity of sodium carboxymethyl cellulose, used for the treatment of PCC in examples 1A-1B, is 0,1,0,2 and 0.3%, calculated on the dry weight of PCC. The amount of sodium carboxymethyl cellulose, used for the treatment of PCC in examples 1C-1D, 0.2%, calculated on the dry weight of PCC. In examples 1G and 1H as filler used raw PCC.

In examples 1A-1H for castings, paper (60 g/m2from boot, consisting of 75% bleached Kraft pulp, hardwood and 25% bleached Kraft pulp, soft wood, crushed in distilled water at pH 7 to the degree of grinding 400 in accordance with the Canadian standard of the degree of grinding (CFS), use the template of the cut sheet (produced Adirondack Machine Corp. (Adirondack Machines Corp.). The consistency of the pulp is 0.3125%. To the pulp add helper to hold (high-density cationic polyacrylamide) in the amount of 0,05% (1 lb/ton of paper) (0.4536 kg / tonne of paper). To the pulp add synthetic dressing material for the agent (dimer of alkylbetaine in the amount of 0.25% (5 lbs/ton of paper) (2.268 kg/tonne of paper). To download slurries is onerous at a relative humidity of 50% and temperature 23oC for at least 24 hours.

The degree of whiteness obtained paper check using test method TAPP1 T452-OM92. The results of this test are shown in table 1 and Fig. 1, where the digital designation 1A-1H correspond respectively to examples 1A-1H. As shown in table 1, the degree of whiteness of the paper improved when using PCC filler subjected to increasing degrees of processing the CMC.

Examples 2A-2F

In examples 2A-2F impact on the degree of whiteness obtained through the use of PCC treated with sodium carboxymethyl cellulose, compared with the effect on the degree of whiteness obtained through separate addition of untreated PCC to download pulp, which contains the CMC. In examples 2A-2F used PCC has a scaly structure, the average particle size of 1.3 microns and a specific surface area of 12.1 m2/year In examples 2A and 2B aqueous suspension of PCC containing 20% solids, is treated with a 1% aqueous solution of sodium carboxymethyl cellulose, as in method (B) to ensure that the degree of processing the CMC, 0.5% by weight relative to the PCC. In example 2C and 2D assess the impact of individual additives suspension of PCC and a solution of sodium carboxymethyl cellulose to icesto of sodium carboxymethyl cellulose, added in examples 2C and 2D, is sufficient to achieve the degree of processing natrocarbonatite corresponding PCC treated with CMC used in examples 2A and 2B. For comparison to the loading of the slurry that does not contain CMC, add the raw PCC, as shown in examples 2E and 2F.

To produce castings that described in example 1A, download pulp using treated and untreated PCC fillers. The degree of whiteness of the resulting castings were evaluated by test method TAPP1 T452-OM92. The results are shown in table 2 and Fig. 2, where digital signs 2A-2F correspond respectively to examples 2A-2F.

Examples 3A-3H.

In examples 3A-3H evaluated the eect of PCC filler on the degree of whiteness. Used precipitated calcium carbonates had a prismatic or rhombohedral structure.

PCC with prismatic structure had an average particle size of 2.2 microns and a specific surface area of 3.6 m2/, PCC with rhombohedral structure had an average particle size of 3.3 microns and a specific surface area of 2.5 m2/,

In examples 3A, 3B, 3E and 3F to provide the degree of treatment CMC, 0.5%, calculated on the dry weight of PCC filler, 1%-n is a, containing 20% solids. For comparison, in examples 3C, 3D, 3G and 3H appreciated aqueous slurry of the raw PCC containing 20% solids.

The PCC fillers added to the download pulp and turned into paper, as in example 1.

The degree of whiteness of the resulting sheets are shown in table 3 and Fig. 3, where the numerical designation 3A-3H are responsible, respectively, examples 3A-3H.

The results presented in table 3, show that to obtain a paper with improved degree of whiteness of the carboxymethyl cellulose can be processed PCC with different structure.

Examples 4A-4D.

Aqueous suspension of chalk containing 20% of solid particles having an average size of 2.2 microns and a specific surface area of 2.1 m2/g, treated as in method (B), 1% aqueous solution of sodium carboxymethyl cellulose to provide the degree of processing the CMC, 0.5% by weight relative to the chalk. Aqueous suspension of talc, containing 20% of solid particles having an average particle size of 4.0 microns and a specific surface area of 14.3 m2/g was treated with 1% aqueous solution of sodium carboxymethyl cellulose, as in method (B) to ensure that the degree of processing the CMC, 0.5% by weight relative to the talc. Examined is described in example 1, except that the level of filler loading pulp amounted to 30%. The degree of whiteness of the resulting paper were evaluated using the test method TAPP1 T452-OM. The results are shown in table 4 and in Fig. 4, where the numerical designation 4A-4D correspond respectively to examples 4A-4D.

The results show that to obtain fillers, suitable for providing an improved degree of whiteness of paper, various inorganic materials can be treated with sodium carboxymethyl cellulose.

Although the present invention is described in detail, it is understood that this is done with the aim of bringing of example and not to limit, the scope of the invention limited only by the scope of the applied claims.

1. The composition is used as filler in the manufacture of paper comprising an inorganic material coated thereon cellulose compound, which is a cellulose, a modified at least one ionic or Deputy containing such Deputy.

2. The composition according to p. 1, characterized in that the inorganic material is a carbonate of alkaline-earth metal.

3. The composition according to p. 2 different aphid 3, wherein the cellulose compound is the salt of the cellulose.

5. The composition according to p. 4, wherein the salt is sodium carboxymethyl cellulose.

6. The composition according to p. 5, wherein the cellulose compound is a sodium carboxymethyl cellulose, which has a degree of substitution of around 0.70.

7. The composition according to p. 6, wherein the sodium carboxymethyl cellulose has a viscosity of from about 25 to about 50 CP.

8. The composition according to p. 1, wherein the cellulose compound is present in the inorganic material in a quantity of at least 0.01 wt.%.

9. The composition according to p. 8, wherein the cellulose compound is present in the inorganic material in an amount of from about 0.05 to about 0.5 wt.%.

10. A method of obtaining a paper in which the cellulose material is transformed into an alkaline slurry is dewatered and formed into paper, characterized in that it comprises the following stages: preparing a finely ground inorganic material is treated with an inorganic material derivative of cellulose formed from cellulose, modified at least one ionic or Deputy containing t is an organic material with cellulose fiber and water to provide a suspension, suitable for molding into the paper.

11. The method according to p. 10, characterized in that the inorganic material is a carbonate of alkaline-earth metal.

12. The method according to p. 10, characterized in that the inorganic material is calcium carbonate.

13. The method according to PP.10 to 12, characterized in that the cellulose derivative is a salt of the cellulose.

14. The method according to p. 13, characterized in that the cellulose derivative is sodium carboxymethyl cellulose.

15. The method according to p. 14, wherein the processing includes adding sodium carboxymethyl cellulose to an aqueous suspension of inorganic material.

16. The method according to p. 15, wherein the processing includes adding dry sodium carboxymethyl cellulose to an aqueous suspension of inorganic material.

17. The method according to any of paragraphs.14 and 15, characterized in that the sodium carboxymethyl cellulose is in the form of a water suspension.

18. The method according to p. 12, wherein the processing includes adding dry powders of inorganic material and sodium carboxymethyl cellulose to the water.

19. The method according to p. 13, wherein the processing includes mixing neo the/P> 20. The method according to p. 19, characterized in that the mixing is carried out for a time from about 15 minutes to about 3 o'clock

21. The method according to p. 13, characterized in that the processing of inorganic material salt of the cellulose is carried out at a temperature of from about 5 to about 95oC.

22. The method according to p. 21, wherein the temperature is from about 20 to about 60oC.

23. Alkaline paper comprising pulp fibers and a filler composition under item 1.

24. Alkaline paper by p. 23, wherein the inorganic material is a carbonate of alkaline-earth metal.

25. Alkaline paper by p. 24, characterized in that the carbonate of alkaline-earth metal is natural and precipitated calcium carbonate.

26. Alkaline paper by p. 23, characterized in that the cellulose derivative is sodium carboxymethyl cellulose.

27. Alkaline paper by p. 23, characterized in that the composition of the filler is present in amounts of between from about 5 to about 45 wt.% relative to the cellulose fibers.

28. The composition is used as a filler in paper production, including an inorganic material coated on the whole what estealam or which contains such ionic Deputy, and which is present in the inorganic material in a quantity of at least 0.01 wt.%.

29. The composition according to p. 28, wherein the inorganic material is a carbonate of alkaline-earth metal.

30. The composition according to p. 29, characterized in that the carbonate of alkaline-earth metal is calcium carbonate.

31. The composition according to p. 28, wherein the cellulose compound is sodium carboxymethyl cellulose.

32. The composition according to p. 31, wherein the cellulose compound is sodium carboxymethyl cellulose, which has a degree of substitution of around 0.70.

33. The composition according to p. 32, wherein the sodium carboxymethyl cellulose has a viscosity of from about 25 to about 50 CP.

34. The composition according to p. 28, wherein the cellulose compound is present in the inorganic material in an amount of from about 0.05 to about 0.5 wt.%.

 

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