Method for processing of white resin sediments

FIELD: production of paper and paper products in pulp-and-paper industry.

SUBSTANCE: method involves adding effective amounts of at least one cation-active polymer coagulant or inorganic coagulant with following adding of material consisting of microparticles, wherein pulp contains cellulose produced at least partly from processed paper products. Coagulant used is of natural or synthetic origin. Material based on microparticles is, for example, bentonite clay, network polymer, colloidal silicon, or polysilicate.

EFFECT: increased efficiency in reducing of white resin sedimentation.

17 cl, 2 dwg, 2 ex

 

Background of invention

Organic deposits in the paper production system can cause a loss in efficiency and reduce the quality of the finished paper because of stains, holes and tears. These organic deposits arise from existing in the nature of the resin in the wood or synthetic materials, such as adhesives, hot melt or latex, found in recycled pulp blends. These deposits are hydrophobic and handling store water. These deposits can grow in size and get stuck on the surfaces of the paper machine or paper. Deposits formed from wood, called "wood resin, whereas sediments from artificial materials are called "sticky" or "white pitch". The white resin is specific to a coating binder lattices, such as the best choice rubber (SBR), and polyvinyl acetate.

Paper production in the simplest understanding includes obtaining cellulose from wood, obtaining a suspension of pulp and water and the formation of the cellulose matrix, which is pressed and dried to form paper. At a crucial stage of obtaining a suspension of cellulose/water (composition paper) is formed in a matrix on a wire grid paper machine. Excess water and malcode the dispersed substance (white water) pass through the matrix on the wire and re-used. The generated mesh is then promoted in the press and machine section for drying, where the matrix becomes paper.

Defective paper is a term used in the paper industry to describe paper that does not meet the standards and therefore cannot be sold. This paper is usually re-used within the production process for the regeneration of fibers, but it can also be sold to other industries as a source of fiber. Defective paper may be coated with a layer, and the coating is applied to the base of the canvas paper as its production. Defective paper on which the coating is referred to as a defect coated paper. Paper waste is a term used in the paper industry to describe the paper, which was used by the consumer. It is often called "post-consumer waste". This paper is often collected and re-used in production for the regeneration of the fibers. Waste paper can be coated with a layer, and the coating is deposited on a substrate of paper as it is processed. Waste paper, which is applied to the coating, referred to as waste coated paper. The paper is coated, which is used repeatedly, can be paper scrap or waste. In recent years, many paper production faced on experience with samples is Emami reuse paper coated, because the coating is injected substances which usually do not exist in the original set of fibers used to manufacture the basis of the paper web.

Coatings typically include various pigments and binders. Typical pigments used include many kinds of clay, calcium carbonate, titanium dioxide and other fillers. It is believed that problems with the white resin is caused mainly by binding substances, which include latex polymers obtained from the best choice and polyvinyl acetate resins, and natural binders, such as starch.

Problems with the white resin known for some time in production, izgotavlivaem paper. The white resin is a sticky light gray matter, which is found in the form of deposits on metal surfaces in the wet zone end portion, forming press or in the zone of the dryer of the paper machine. It's called "white", to distinguish it from brown or black resin, which is formed from substances contained in the wood. White resin found in the white water. Sometimes deposits of charred resin, forming a black deposits in the zone of the dryer of the paper machine. It was shown that the problem with the white resin is due to the relatively high is m using paper coated in loading on production, faced with a problem. When the paper is coated again turns into a pulp mass, clay or minerals and latex included in the coating, do not disperse easily in the pulp mass, and form agglomerates, which lead to the white resin. White resin can cover layer equipment or to form defects in the paper, if the paper machine she moves to cellulose. Long machine downtime, frequent cleaning, defects of a sheet of paper, such as holes and the increased number of cracks in the sheet, are costly problems associated with deposits of white resin. Cleaning equipment really means, because the sediments can be found on the films, the register rollers, in vacuum chambers, drying drums and the drying cloth and throughout the felts.

Various solutions have been proposed to overcome the problems with the white resin. Several chemical substances that regulate the deposition of currently used or evaluated in paper production. Using capture and dispersion of small particles of the latex sheet issue white resin can be adjustable. More specifically, the latex particles must be attached to the fibers immediately through repeated tie-breaker cellulose. The PTO is t latex particles are small and have anionic structure and therefore they can quit as part of a paper web. Due to the anionic nature as latex particles, and fibers, the additive having a low molecular weight and a strong cationic charge, it is best suitable for this purpose. However, one Supplement may not be enough to keep the latex particles in the paper sheet, and applying a retarding excipients that are compatible with the additive, may be important for the successful control of the white resin.

Synthetic polymers are the most effective known for acting against deposition additives for white resin. They have a high content of cationic groups, giving them the opportunity to create a strong electrostatic bond between the fibers, the latex particles and the additive. Paradises, the fiber will move the latex particles to the end of production by retarding excipients, and the particles will become part of the finished paper. It was shown that polyglycol with an average molecular weight, polymers based aminoglucose or polyethylenimine are useful in reducing the number of white resin.

Some of the processing methods for the solution of problems connected with white resin, described in the following sources.

In the patent US 5131982 (in the name of Michael R. St. John) describes the use of polymers and copolymers containing diallyldimethylammonium the ID (DADMAC), for processing of cellulose fibers, recycled from recovered waste paper with a coating to make them suitable for the production of paper.

In the patent US 4997523 (in the name of Pease and others) describes the use of tetrafunctional of alkoxyamine in combination with phosphate, phosphonate or phosphoric acid, in order to minimize the deposition of white pitch on producing paper equipment.

In the patent US 4643800 (name Maloney and others) describe the use of a nonionic surfactant based oxicological, in which one terminal hydroxyl group substituted aliphatic or alkylaromatic group, and the other two terminal hydroxyl group substituted polyoxypropylene group or the residue of the simple benzyl ester, in combination with polyelectrolyte dispersing additive with an average molecular weight of 500-50000 to remove and dispersing impurities from the secondary fiber during processing for reuse.

There are some disadvantages in the use of polymers to control white resin. Polymers typically are not cost effective. For example, polyethylenimine (PEI), a tertiary amine polymer is an effective additive in the control of white resin, but it is quite expensive to use.

There are other the right, used for control of white resin. In the past, usually used talc, and he still sometimes used to control sediments. As the surface active filler to control deposits of talc acts by reducing the stickiness of space around the particles of the resin so that it could not attach to making paper equipment. However, this assumes only a temporary solution on the resin of the problem, which appears again as you continue processing. Talc does not attach the latex particles to the fibers, and therefore, when exposed to shear forces new adhesive area, causing sediments. Additives that react with the surface of the particles of resin to make it less sticky (substance reduce stickiness), also offer a temporary solution to the problem of control of the white resin. In published patent application US 20001/0023751 describes how to reduce stickies using polyvinyl alcohol and bentonite. Polyvinyl alcohol acts as a masking agent for the particles. The problem lies in the need to use excessive amounts of polyvinyl alcohols. Bentonite absorbs excess polyvinyl alcohol.

Summary of invention

The present invention is a system of control over what flagenium, consisting of inorganic or organic (natural or synthesized) coagulant and material-based microparticles (synthetic or natural), such as bentonite clay, mesh polymer, colloidal silica, polysilicate or borosilicate, for pulp containing white resin/Velcro. The order of addition of these two components is essential to maintain the benefits associated with a decrease in the number of white resin in the technology of making paper. The coagulant may be added in the tie-breaker cellulose or tank to a thick pulp and paper pulp and the material of the microparticles can be added at the exit of the tie-breaker cellulose or tub before dilution of the pulp and paper pulp.

Detailed description of the invention

The results of numerous turbidimetric measurements shown in figure 1. The turbidity of the circulating water (filtrate) is a measure preserving colloidal latex emulsion particles or indicators of purity. Using polyamine as a single component is achieved by reduction in turbidity compared with untreated paper marriage with the coating. However, the addition of material on the basis of microparticles and coagulant provides a significant reduction in turbidity. These data show is that more particles are white resin/adhesive remains rather in the pulp and paper fibrous mass, than recycle in the system of making paper. These laboratory results demonstrate that the system coagulant/substance of microparticles significantly reduces the accumulation of white resin/adhesive in the method of manufacturing paper.

The present invention is a system of control over the deposition consisting of inorganic or organic (natural or synthesized) coagulant and material-based microparticles (synthetic or natural), such as bentonite clay, mesh polymer, colloidal silica, polysilicate or borosilicate, for pulp containing white resin/Velcro.

The coagulant may be inorganic or organic (natural or synthetic) material. Examples of appropriate organic coagulants are polymer with a low molecular weight and high charge density polymer, which is usually homopolymers recurring cationic groups or a copolymer containing at least 80 wt.% cationic monomer and 0 to 20 wt.% acrylamide or other non-ionic monomer. The cationic groups can be formed from diallyldimethylammoniumchloride and dialkylaminoalkyl(meth)acrylates and - acrylamides (usually in the form of a Quaternary ammonium salt or acid additive salts). Quaternary ammonium salt of dimethylaminoethyl is relate or Quaternary ammonium salt methacrylate is often particularly preferred. Alternative coagulant may be a condensation polymer, such as polymer dicyandiamide, polyamine or polyethylenimine. Can be used inorganic coagulants such as alum, lime, ferric chloride (III) and iron sulphate (II)).

Cationic coagulants that can be used in this aspect of the invention include the well known, commercially available, having a molecular weight from low to medium, water-soluble polyaminoamide, including those that obtained by the interaction of alkylenediamine with difunctional alkylhalides. Substances of this type include the condensation polymers obtained by the reaction of ethylene dichloride and ammonia-ethylene, ammonia and secondary amine, such as dimethylamine, epichlorohydrin-dimethylamine, epichlorohydrin-dimethylamine-ammonia, polyethyleneimine and the like. In some cases kationnyi starch can be used as a coagulant. Inorganic coagulants such as alum and polyaluminium, can also be used according to the invention. The normal use of inorganic coagulants is usually 0.005 to 1 wt.% calculated on the dry weight of the fiber in the download.

The preferred coagulant is a cationic polyelectrolyte, i.e. poly[diallyl di(hydrogen or (ness.)alkyl)]ammonium salt having the value of the average molecular weight of more than 300,000 but less than 2000000.

Materials consisting of microparticles, can be synthetic or natural. Examples of appropriate materials based microparticles are nabukenya clay materials, mesh polymer, colloidal silica, borosilicate, or suspension of anionic material on the basis of microparticles selected from bentonite, colloidal silica, polysilicate microgel, microgel polysilicon acid and microemulsions with cross water-soluble Monomeric substances.

Materials-based microparticles are widely used in manufacturing paper manufacturing as retention AIDS, especially for high-grade paper. One such system uses nabuhay clay to provide an improved combination of retention and hydration, as described in patents US 4753710 and 4913775, disclosure of which is included below with the help of citation in this description. In the method described Langley and others, cationic linear polymer with high molecular weight is added to the aqueous pulp slurry for the manufacture of paper before the suspension was subjected to shear, with the subsequent addition of Nabakevi clay, such as bentonite, after the application of shear. Shear deformation, usually provided by one or more steps of the method of manufacture of the ing the paper - cleaning, mixing and pumping, and the shift destroys large flakes formed by using a polymer with a high molecular weight, in micrographia. Further agglomeration occurs when adding particles of bentonite clay.

Other programs associated with microparticles, based on the use of colloidal silica as microparticles in combination with cationic starch, such as described in patents US 4388150 and 4385961, disclosure of which is included with the citation in the description, or using a combination of cationic starch, occulant and flint Zola, such as described in patent US 5098520, and in the patent US 5185062, disclosure of which is also included with the citation in this description. Patent US 4643801 discloses a method of producing paper using an anionic water-soluble polymer with high molecular weight, dispersed silica and cationic starch.

Moreover, the microparticle obtained from borosilicate, preferably aqueous solutions of colloidal particles of borosilicate have a molar ratio of boron to silicon is from 1:1000 to 100:1 and usually from 1:100 to 2:5. Holding the excipient may be a colloid borosilicate, chemistry which is similar to the chemistry of borosilicate glass. This colloid, as a rule, be obtained by interaction between salt selecing the metal boron-containing compounds with silicic acid in the conditions, leading to the formation of the colloid. Borosilicate particles may have a size covering a wide range, for example, from 1 nm (nanometer) to 2 μm (2000 nm), and preferably from 1 nm to 1 μm.

The microparticle may be inorganic, such as colloidal silica (such as described in patent US 4643801), polysilicates the microgel (such as described in patent EP-A-359552), microgel polysilicon acid (such as described in patent EP-A-348366), their variants, modified aluminum. In particular, can be used in systems that are described in patents US 4927498, 4954220, 5176891 and 5279807 and put into serial production companies Ciba Specialty Chemicals and Dupont under the trade name partical.

Anionic organic materials in the form of microparticles can also be used. For example, suitable are anionic organic polymer emulsion. Emulsified polymer particles may be insoluble because of the formation of the copolymer, for example a water-soluble anionic monomer and one or more insoluble monomers, such as acrylate, but preferably the polymer emulsion is net microemulsion water-soluble Monomeric substances, for example, as described in patents US 5167766 and 5274055, and put into mass production by the company Ciba Specialty Chemicals under the trade name Polyflex.

Size frequent the s material in the form of microparticles, typically, less than 2 microns, preferably less than 1 μm and most preferably less than 0.1 microns.

The amount of material in the form of microparticles (dry weight calculated on the dry weight of the pulp suspension) is, as a rule, at least 0.03% and usually at least 0.1 percent. It may rise, for example, to 1.6 or 2%, but usually less than 1%.

The preferred material in the form of microparticles is nabukeera clay, especially nabukeera clay from the family of smectites. Preferred members of the family of smectites include bentonite, montmorillonite, saponite, hectorite, badili, nontronite, fallerovo earth and mixtures thereof. Component Nabakevi clay, containing mainly bentonite, is particularly preferred. It is necessary that the bentonite was highly swollen activated form, and in practice this means that it must be in the form of a monovalent salt of bentonite, such as sodium bentonite. Although there are several natural sources of sodium bentonite, the most bentonites are bentonites alkaline earth metals, as a rule, bentonites calcium or magnesium. The usual practice is to activate bentonite alkaline earth metal by ion exchange of calcium and magnesium by sodium or other alkali metal or ammonium ion. Typically, this is done by alongside the aftermath of the bentonite in aqueous solution of sodium carbonate, although there are other activating agents. Varieties Nabakevi clays are natural substances and is available for sale.

The appropriate fiber for receiving pulp all have qualities that are commonly used for this purpose, for example, wood pulp, bleached and unbleached pulp and the pulp and paper fibre mixture from all annual plants. Wood pulp includes, for example, wood fibers, thermomechanical pulp (TSR), chemothermomechanic cellulose (STMR), compressed wood fibre, pulp, obtained with high yield technical pulp and wood pulp from wood pulp (RMP). Examples of relevant cellulose are sulfate, sulfite and soda pulp. Unbleached pulp, which are also referred to as carriers of unbleached Kraft pulp, are used preferably. The corresponding annual plants for pulp and paper fibrous masses are, for example, rice, wheat, sugar cane and hemp.

Fibrous mass gain, using waste paper, either alone or in a mixture with other fibers. Paper waste include waste paper coated with the contents of the binders used in the coating and printing ink, lead to the formation of a white resin. yavlenie fibers and fibrous masses may be used individually or in mixtures with each other. Binders, arising from the pressure-sensitive adhesive labels and envelopes and binders from the sealing of the book of roots, and the molten lead to the formation of traps.

The present invention is particularly suitable for making paper, which disposed of the pulp mass, obtained from a significant quantity of recycled paper or paper marriage. The value of a significant number will vary depending on system type and disposed of, recycled or defective paper, but will differ in that in the flow of product has a significant amount of white resin, to have significant impact on the working conditions. In General, at least 10% pulp must be obtained from recycled or waste paper product, to cause the formation of significant quantities of white resin.

The method of controlling the deposition is introduced into the system making paper by adding to the technology of thick or thin pulp and paper the pulp in paper production. An important aspect of this method is the regulation of the time of addition of each component. The method requires the addition of cationic coagulant, followed by anionic particle. Without going into theory, it is believed that p is AdwareDelete adding a cationic coagulant improves the adsorption of white resin with anionic microparticles. In addition, it is believed that the cationic coagulant is absorbed on the resin (wood, white and sticky), which are predominantly anionic or nonionic, making them at least partially in the cationic state. Now, bentonite, containing increased adsorbed amount of resin retained in the paper during its formation. The result is a reduced amount of tar in the upcoming product. In a preferred variant embodiment of the invention, the coagulant is added to the tie-breaker cellulose or Chan for the pulp and paper thick fibrous mass, whereas the material consisting of microparticles is added at the exit of the tie-breaker cellulose or tank to dilute the pulp and paper the pulp.

The invention is further described by the following non-restrictive in its scope by the examples. The examples illustrate the invention, which is characterized only by the attached claims.

Example 1

Sheets of coated paper was turned into a fibrous mass in a lab tie-breaker cellulose. An aliquot of pulp and paper pulp 400 ml with a consistency of 1% was stirred at 1000 rpm Coagulant with the structure polyamine and bentonite microparticles were added at intervals of 1 min with stirring. Polyamine was added in quantities of 1, 1.5 or 2 pounds per ton, as usual, C is the bentonite in the amount of 4, 6 or 8 pounds per ton. After processing, pulp and paper mass was filtered through a sieve of 100 mesh, and the filtrate was measured by turbidity. Each sample of the filtrate were prepared by dilution with deionized water 1:14. For the analysis used a portable turbidimeter Hach 2100P and the results were registered in the values turbidity units (NTUs). The results are shown in figure 1

Example 2

Sheets of coated paper was turned into a fibrous mass. An aliquot of pulp and paper pulp 400 ml with a consistency of 2.5% was stirred at 1000 rpm Coagulant with the structure or polyamine, poly(diallyldimethylammoniumchloride) (DADMAC), or polyaminoacid (ASD) and bentonite microparticles were added at intervals of 1 min with stirring. The coagulant was added in the amount of 1 pound per ton, as usual, then the bentonite in the amount of 4, 6 or 8 pounds per ton. The coagulant was added as one component in quantities of 1 or 2 pounds per ton, as usual. After processing, pulp and paper mass was filtered through a sieve of 100 mesh, and the filtrate was measured by turbidity. Each sample of the filtrate were prepared by dilution with deionized water 1:14. For the analysis used a portable turbidimeter Hach 2100P and the results were registered in the values turbidity units (NTUs).

Results

The results of turbidimetric maintenance is for each treatment is shown in figure 2. The turbidity of the circulating water (filtrate) can serve as an indicator of conservation colloidal latex emulsion particles or indicators of purity. Using polyamine or DADMAC as the only component in 1 or 2 pounds per ton is achieved by reduction in turbidity compared with untreated paper marriage with the floor. However, the addition of bentonite with different coagulants reduce the turbidity of the water. A significant reduction in turbidity was observed when compared to 1 pound per ton, as usual, polyamine or coagulant RACES + bentonite to 2 pounds per ton, as usual.

1. Method for the production of paper comprising adding to the paper pulp an effective amount to reduce fat white resin of at least one cationic polymer coagulant or inorganic coagulant, followed by the addition of material consisting of microparticles, where paper pulp contains a cellulose derived at least partly from recycled paper products.

2. The method according to claim 1, where the material on the basis of microparticles selected from the group consisting of Nabakevi clay, mesh polymer, colloidal silica, borosilicate or suspensions of anionic material consisting of microparticles selected from bentonite, colloidal silica, polysilicates Mick is ogele, microgel polysilicon acid and mesh microemulsions of water-soluble Monomeric substances and their mixtures.

3. The method according to claim 2, where the material containing microparticles is an anionic material.

4. The method according to claim 2 or 3, where the material containing microparticles is Nabakevi clay from the family of smectites.

5. The method according to claim 2, where the material containing microparticles, is a mineral consisting essentially of bentonite, montmorillonite, saponite, hectorite, beidellite, nontronite, preparation of (fuller's earth and mixtures thereof.

6. The method according to claim 1, where the material containing microparticles, is a mineral consisting mainly of bentonite.

7. The method according to claim 1 where the cationic polymer coagulant is homopolymer containing recurring cationic group, or a copolymer of at least 80 wt.% cationic monomer and 0 to 20 wt.% acrylamide or other non-ionic monomer.

8. The method according to claim 7, where the cationic group derived from diallyldimethylammoniumchloride and dialkylaminoalkyl(meth)acrylate and acrylamide or their Quaternary ammonium salts.

9. The method of claim 8, where the cationic groups are Quaternary ammonium salt dimethylaminoethylacrylate or methacrylate.

10. The method according to claim 1, where the coagulant polymer is dicyandiamide, polyamine or polyethylenimine.

11. The method according to claim 1, where the coagulant of wybir the t group, consisting of alum, lime, ferric chloride (III), polyaminoacid, iron sulfate (II) and mixtures thereof.

12. The method according to claim 1, where the coagulant is polyalkyleneglycol obtained by the interaction of alkylenediamine with difunctional alkylhalides.

13. The method according to claim 1, where the coagulant is a cationic polyelectrolyte, i.e. poly[diallyl di(hydrogen or (ness.)alkyl)]ammonium salt, average molecular weight is more than 300,000, but less than 2000000.

14. The method according to item 13, where the material consisting of microparticles, is a mineral consisting mainly of bentonite.

15. Paper product obtained according to the method according to any one of claims 1 to 5 or 7 to 13.

16. Paper product obtained according to the method according to claim 6.

17. Paper product obtained according to the method according to 14.



 

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