Cleaning agent for paper manufacturing process

Abstract

To provide a technology capable of more preferably cleaning a pitch stain by organic materials in a paper manufacturing step, especially a (meth)acrylate-based pitch stain.SOLUTION: A cleaning agent for a paper manufacturing process includes an aliphatic diamine compound. A cleaning method of paper manufacturing tools or a manufacturing method of paper includes cleaning paper manufacturing tools by using a medicament including an aliphatic diamine compound or a cleaning agent for a paper manufacturing process including an aliphatic diamine compound.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cleaning agent for the papermaking process, a cleaning method for the papermaking process, and the like. [Background technology]

[0002] Papermaking is carried out through a papermaking process in which raw material slurry in which pulp raw materials are dispersed in water is made into paper. In the papermaking process, a large amount of white water containing fine fibers and fillers is discharged from a papermaking machine or the like. The discharged pulp-containing water (also called white water) is circulated in the papermaking process or used in the preparation process from the viewpoint of effective use and reuse of water resources. At this time, the white water contains EVA-based adhesives, acrylate-based adhesives, sizing agents (rosin-based, AKD-based, ASA-based, etc.), latex, etc., and such hydrophobic viscous substances are also called pitch, which are considered to be the cause of organic stains. Generally, pitch refers to a hydrophobic adhesive substance mainly composed of resin components derived from pulp, synthetic adhesive substances in recycled waste paper, and organic substances derived from additives used in the papermaking process.

[0003] Pitch is highly hydrophobic and has the property of easily agglomerating into pitch lumps. For this reason, agglomerated pitch lumps mixed into the papermaking raw material cause defects in the final paper product, and pitch adhering to equipment or process facilities that use white water (e.g., papermaking tools such as wires, felts, and press rolls, papermaking machines equipped with these, and process facilities in paper manufacturing) causes problems in papermaking, especially in the papermaking process, such as paper breaks, product quality deterioration, and poor dewatering. Such problems that reduce product quality and production efficiency due to pitch are also called pitch problems.

[0004] For this reason, in the papermaking process, for example, Patent Document 1 proposes a method of removing natural rubber, synthetic rubber, pitch, etc. adhering to felt used in papermaking by softening the felt with a detergent and a hot water shower and adhering the natural rubber, pitch, etc. to an aggregate of synthetic fibers attached to a felt roll. In addition, in the papermaking process, for example, Patent Document 2 proposes a method for cleaning papermaking felt in which a detergent for the papermaking process containing an acrylic acid-based polymer and polyoxyethylenestearylamine is added to shower water. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 49-1641 [Patent Document 2] JP 2006-16737 A Summary of the Invention [Problem to be solved by the invention]

[0006] Both Patent Documents 1 and 2 disclose that the addition of a nonionic surfactant can reduce the adhesion of pitch, and Patent Document 2 discloses that, among nonionic surfactants, polyoxyethylenestearylamine, which is an aliphatic amine surfactant, is effective. However, current pitch countermeasures using chemicals are not sufficient to clean pitch stains or prevent their adhesion, particularly acrylate-based stains, and pitch damage cannot be sufficiently suppressed. Furthermore, pitch countermeasures using equipment are limited because they are prone to problems such as an increase in runoff raw materials and finer pulp fibers.

[0007] Therefore, a main object of the present invention is to provide a technology that can more effectively clean pitch stains caused by organic matter in the papermaking process, particularly acrylate-based pitch stains. [Means for solving the problem]

[0008] As a result of intensive research, the present inventors have newly discovered that an aliphatic diamine compound has an effect of more effectively dissolving acrylate-based pitch stains in the papermaking process, and have completed the present invention. That is, the present invention is as follows.

[0009] The present invention can provide a detergent for the papermaking process, which contains an aliphatic diamine compound. The present invention can provide a method for cleaning papermaking tools, comprising cleaning papermaking tools using an agent containing an aliphatic diamine compound or using the detergent for the papermaking process. The present invention can provide a method for producing paper, which includes cleaning papermaking tools using an agent containing an aliphatic diamine compound or using the detergent for papermaking process. The aliphatic diamine compound may be a diamine compound having one or more aliphatic hydrocarbon groups. The aliphatic diamine compound may be a polyoxyalkylene aliphatic diamine. It may also be used to clean papermaking tools used in the papermaking process. The method may include adding the agent or the papermaking process cleaner to shower water for washing papermaking tools provided in a papermaking apparatus. Effect of the Invention

[0010] According to the present invention, it is possible to provide a technology that can more effectively clean pitch stains in the papermaking process, especially acrylate-based pitch stains. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram showing each step of paper manufacturing in the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the embodiment for carrying out the present invention will be described. Note that the embodiment described below shows an example of a typical embodiment of the present invention, and the scope of the present invention is not limited by this. In addition, in this embodiment, the upper limit value and the lower limit value in the numerical value can be arbitrarily combined as desired.

[0013] 1. Cleaning agent for papermaking process according to the present invention

[0014] In recent years, with the increase in the recycling rate of waste paper, low-grade waste paper with a lot of impurities has begun to be recycled. Impurities include adhesives from labels and stickers attached to waste paper, and adhesives from tapes and adhesives used to shape boxes, etc., and these adhesives are the main cause of pitch troubles that occur in papermaking machines. Furthermore, traditionally, the main components of pitch were resin acids derived from pulp, rosin-based compounds derived from sizing agents, which are internal additives, AKD (alkyl ketene dimer)-based compounds, and ASA (alkenyl succinic anhydride)-based compounds. However, in recent years, the main components of pitch are acrylate-based polymers derived from sticky impurities in waste paper, EVA (ethylene vinyl acetate), etc., and because of their high adhesiveness, cleaning to remove pitch stains in paper manufacturing has become much more difficult than before.

[0015] Polyalkyl oxide alkyl ether surfactants, polyoxyalkylene block copolymer surfactants, and aliphatic amine surfactants, which are the mainstream pitch adhesion inhibitors or cleaners for papermaking tools, have not been sufficiently effective against pitch stains originating from waste paper caused by acrylate adhesives or EVA adhesives, etc. Also, as a countermeasure against pitch using chemicals, in addition to external chemicals such as tool cleaners, one or more internal chemicals selected from fixing agents, dispersants, detackifying agents, decomposing enzymes, etc. may be used, but the current countermeasures against pitch using chemicals are not sufficient to suppress pitch problems.

[0016] Other possible measures to prevent pitch stains include equipment cleaning methods other than chemicals and improvements to the materials used for the equipment. However, while increasing the water pressure of the shower is effective in improving equipment cleaning, there is a limit to how much water pressure can be increased because increasing the water pressure causes deterioration of the equipment, such as fraying of the felt. In addition, improving the materials used for the equipment, such as applying a Teflon coating to press rolls, is also effective in reducing equipment stains, but there is a limit to how much material improvement can be made due to the need for extensive part replacement, the need to maintain the strength of the equipment, and increased costs.

[0017] Thus, there is a demand for an effective cleaner for acrylate pitch, which is considered to be particularly difficult to prevent adhesion or to clean using chemicals, among the major sticky substances contained in dirt on tools such as papermaking machine wires, felts, and press rolls. Furthermore, when a surfactant is used to clean and prevent pitch stains from adhering to the paper machine, foaming is promoted, which can cause problems in the foam separation tank and drainage channel for the cleaning waste liquid. Therefore, when using a surfactant to clean the tools of the paper machine, measures against foaming must be taken at the same time, which leads to an increase in work hours and running costs.

[0018] In addition, measures against pitch using equipment include, for example, removing pitch using a screen or cleaner, and refining pitch using a kneader or refiner, etc. However, there are limitations to measures against pitch using such equipment because of problems such as an increase in outflow raw material and refining of pulp fibers.

[0019] Therefore, a main object of the present invention is to provide a technique for more effectively cleaning pitch stains, particularly acrylate-based pitch stains, in the papermaking process.

[0020] In order to achieve the above-mentioned object, the present invention can provide a cleaning agent for papermaking process containing an aliphatic diamine compound. The present invention can also provide a pitch stain adhesion inhibitor or pitch stain cleaning agent containing an aliphatic diamine compound, and the aliphatic diamine compound can exhibit a better adhesion prevention or cleaning effect on pitch stains, particularly acrylate-based pitch stains, generated in the papermaking process, and can be used as a drug for such cleaning or adhesion prevention purposes. The aliphatic diamine compound is also suitable for use in preventing adhesion of or cleaning pitch stains on devices or mechanisms used in the papermaking process, and tools used therein. Furthermore, the aliphatic diamine compound is also suitable for being contained in or used as a drug for cleaning papermaking tools used in the papermaking process.

[0021] The above-mentioned "acrylate-based" is also called polyacrylate-based. Examples of the acrylate-based polymer causing the acrylate-based sticky matter or pitch stain include viscous acrylate-based polymers used and contained in pressure sensitive adhesives and / or adhesives. Examples of the acrylate-based polymer include acrylate homopolymers polymerized from the same components (monomers, oligomers, polymers) and copolymers obtained by polymerization using two or more different components (monomers, oligomers, polymers) having copolymerizability.

[0022] The aliphatic diamine compound is preferably a diamine compound having one or more aliphatic hydrocarbon groups, and more preferably a polyoxyalkylene aliphatic diamine.

[0023] <Aliphatic diamine compounds> The aliphatic diamine compound used in the present invention is not particularly limited, and may be one or more selected from aliphatic diamines, their salts, and their derivatives. The aliphatic diamine compound is preferably a compound in which an aliphatic group is bonded to two nitrogen atoms. The aliphatic group in the aliphatic diamine compound is not particularly limited, but preferably contains a monovalent group bonded to one nitrogen atom and a divalent group bonded to both of the two nitrogen atoms. The aliphatic group is preferably an aliphatic hydrocarbon group, which may have a substituent. The aliphatic hydrocarbon group may be either a saturated aliphatic hydrocarbon group (CC single bond; for example, an alkyl group, an alkylene group, etc.) or an unsaturated aliphatic hydrocarbon group (a double bond or a triple bond between two carbon atoms in a molecule). The aliphatic hydrocarbon group may be either a chain (straight chain, branched chain) or an alicyclic group, but a chain is preferred. The aliphatic hydrocarbon group is preferably a saturated aliphatic hydrocarbon group, more preferably an alkyl group or an alkylene group, which may have a substituent.

[0024] The aliphatic diamine compound used in the present invention is preferably a compound having one or more aliphatic hydrocarbon groups, the number of the aliphatic hydrocarbon groups being more preferably 2 to 5, and even more preferably 2 to 3, and is preferably a diamine compound having two aliphatic hydrocarbon groups. Examples of the aliphatic diamine compound used in the present invention include alkyl diamine compounds and polyether diamine compounds, and one or more selected from these can be used, and alkyl diamine compounds and / or polyether diamine compounds are preferred.

[0025] In addition, the aliphatic diamine compound used in the present invention is preferably one or more selected from (a) compounds having one or more (preferably one) aliphatic hydrocarbon groups, (b) compounds having one or more (preferably one) aliphatic hydrocarbon groups between nitrogen atoms, and (c) compounds having one or more (preferably 1 to 3, more preferably 3) alkyleneoxy groups or polyalkyleneoxy groups. The number of carbon atoms in the (a) aliphatic hydrocarbon group is not particularly limited, but is preferably 6 to 30, more preferably 6 to 25, more preferably 10 to 25, even more preferably 12 to 22 or 23, and even more preferably 12 to 18. The (a) aliphatic hydrocarbon group is preferably an alkyl group, and is preferably chain-like, and more preferably linear. The number of carbon atoms in the (b) aliphatic hydrocarbon group between the nitrogen atoms is not particularly limited, but is preferably 1 to 5, and more preferably 2 to 4. The (b) aliphatic hydrocarbon group between the nitrogen atoms is preferably an alkylene group, and is preferably linear. The (c) alkyleneoxy group or polyalkyleneoxy group is not particularly limited, but may be any of the polyoxyalkylene aliphatic diamine compounds, compounds (1), compounds (2), and the like, which will be described later.

[0026] Examples of the aliphatic diamine compound include diamine compounds having two amino groups (-NHH) at both ends (e.g., ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, decanediamine, dodecanediamine, etc.); diamine compounds having a primary amine (R-NH-: preferably R is an alkyl group) and an amino group at both ends (e.g., stearylpropylenediamine, oleylpropylenediamine, tetradecylpropylenediamine, stearylethylenediamine, oleylethylenediamine, tetradecylethylenediamine, alkylpropylenediamines, beef tallow propylenediamine, hardened beef tallow propylenediamine, etc.); polyether diamine compounds (preferably polyoxyalkylene aliphatic diamine compounds), and the like. One or more selected from these can be used.

[0027] More preferred aliphatic diamine compounds are compounds having a chain-like aliphatic hydrocarbon group having 6 to 30 carbon atoms and an alkylene group having 1 to 5 carbon atoms, and more preferred are compounds having one aliphatic hydrocarbon group (preferably an alkyl group) in a side chain and one alkylene group between the nitrogen atoms.

[0028] A more preferred aliphatic diamine compound is a polyoxyalkylene aliphatic diamine compound. The number of carbon atoms in the "aliphatic hydrocarbon group" in the polyoxyalkylene aliphatic diamine compound is not particularly limited, but is preferably 10 to 25. In addition, the polyoxyalkylene aliphatic diamine compound is preferably one having a plurality of polyoxyalkylene groups (preferably three).

[0029] The polyoxyalkylene group is preferably one formed by an addition reaction of, for example, ethylene oxide, propylene oxide, butylene oxide, etc. The polyoxyalkylene group may have the same type of alkylene oxide or multiple types of alkylene oxides added thereto, and when multiple types of alkylene oxides, such as two or more types selected from ethylene oxide, propylene oxide, butylene oxide, etc., are added, the arrangement may be random or block.

[0030] The number of moles of "polyoxyalkylene" added in the polyoxyalkylene aliphatic diamine compound is not particularly limited, but a suitable lower limit is preferably 5 or more, more preferably 7 or more, and even more preferably 10 or more, and a suitable upper limit is preferably 30 or less, more preferably 25 or less, and even more preferably 20 or less, and a more suitable numerical range is preferably 7 to 30, and more preferably 10 to 20.

[0031] A more preferred aliphatic diamine compound is a compound represented by the following general formula (1) (also referred to as compound (1)).

[0032] [ka]

[0033] In the formula (1), R 1 represents an aliphatic hydrocarbon group (preferably an alkyl group), R 2 represents an aliphatic hydrocarbon group (preferably an alkylene group), R 3 ~R 5 each independently represents a hydrogen atom, an oxyalkylene group (preferably, in AO, A is an alkylene group having 2 to 4 carbon atoms) or a polyoxyalkylene group (preferably the number of structural units (also called the number of moles added) is 0 to 30).

[0034] R 1 The number of carbon atoms is not particularly limited, and a suitable lower limit is preferably 6 or more, more preferably 12 or more, and a suitable upper limit is preferably 40 or less, more preferably 30 or less, and a suitable numerical range is preferably 6 to 22, more preferably 12 to 22 or 12 to 23, and even more preferably 12 to 18. R 1is preferably an alkyl group having 6 to 22 or 6 to 23 carbon atoms. Examples of the alkyl group include an octyl group, a lauryl group, a myristyl group, a palmitoyl group, a stearyl group, an isostearyl group, a butyldodecyl group, a hexyldecyl group, a hexyldodecyl group, an octyldecyl group, an octyldodecyl group, an octyltetradecyl group, a decyldodecyl group, and a decyltetradecyl group. Among these, a lauryl group, a myristyl group, a palmitoyl group, a stearyl group, an isostearyl group, and a dodecyl group are preferred. One or more types selected from these groups can be used.

[0035] R 2 The number of carbon atoms is not particularly limited, and a suitable lower limit is preferably 1 or more, more preferably 2 or more, and a suitable upper limit is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less, and the suitable numerical range is preferably 1 to 5, more preferably 2 to 4, and even more preferably 2 to 3. R 2 is preferably an alkylene group, and examples of the alkylene group include a methylene group (-CH2-), an ethylene group (-(CH2)2-), a trimethylene group (-(CH2)3-), a propylene group (-CH(CH3)CH2-), and a butylene group (n-, iso-, sec-, tert-), among which an ethylene group and a propylene group are preferred. One or more types selected from these can be used. R 2 is more preferably an alkylene group having 2 to 3 carbon atoms.

[0036] R 3 ~R 5 are each preferably an oxyalkylene group or a polyoxyalkylene group, and the total number of moles of the polyoxyalkylene groups added is preferably 0 to 30, more preferably 7 to 30, even more preferably 10 to 25, and even more preferably 10 to 20. Here, the number of moles of the polyoxyalkylene groups added is an integer value in a single molecule, and can be a rational number that is an average value in the case of an aggregate of multiple types of molecules. Hereinafter, the number of moles added is defined in the same manner. Note that each R3 ~R 5 In the above formula, different types of alkylene oxides may be added, and in this case, the arrangement may be random or block. As the "alkylene group" in the oxyalkylene group or polyoxyalkylene group, R 2 The structure described above can be appropriately adopted, and the number of carbon atoms of the "alkylene group" is preferably 2 to 4, and more preferably 2 to 3. In addition, the "oxyalkylene group" in the oxyalkylene group or polyoxyalkylene group is preferably an oxyethylene group and / or an oxypropylene group, and more preferably an oxyethylene group.

[0037] An even more suitable aliphatic diamine compound is a compound represented by the following general formula (2) (hereinafter, also referred to as compound (2)).

[0038] [ka]

[0039] In the formula (2), R 1 is R in the above formula (1). 1 and is preferably an aliphatic hydrocarbon group (preferably an alkyl group) having 6 to 28 carbon atoms. l, m, and n each independently or the same is a number from 0 to 30 and indicates the number of moles of ethylene oxide units added. R in formula (2) 1 is suitably an alkylene group having an amino acid sequence of 12 to 22 or 12 to 23, and the total value of l, m, and n is preferably 7 to 30, and more preferably 10 to 20.

[0040] The aliphatic diamine compound and the polyoxyalkylene aliphatic diamine compound can be obtained by a known production method or as a commercially available product.

[0041] The aliphatic diamine compound used in the present invention is preferably applied to pitch stains, more preferably to stains caused by organic substances such as neutral rosin sizing agents and / or acrylate polymers, and even more preferably to acrylate adhesives such as those that are considered to be the main components of pitch derived from waste paper, or to pitch stains caused by acrylate adhesives.

[0042] In the present invention, by using the aliphatic diamine compound, pitch stains on tools such as wires, felts, and press rolls in the papermaking process, preferably pitch stains caused by organic substances including neutral rosin sizing agents and / or acrylate polymers, can be reduced. The present invention has the advantage that the use of the aliphatic diamine compound provides a large improvement (improvement effect) particularly for acrylate-based pitch deposits, in comparison with conventional pitch stain suppression techniques. Conventional agents for suppressing or preventing pitch stains have had difficulty in preventing or cleaning acrylate-based pitch stains, which are the main sticky substances contained in pitch stains, but the use of the aliphatic diamine compound makes it possible to more effectively clean or prevent the adhesion of acrylate-based pitch stains.

[0043] Therefore, by using the aliphatic diamine compound, the present invention can provide a technology that can clean pitch stains, particularly acrylate-based pitch, that occur in the papermaking process, or a technology that can prevent the adhesion of pitch stains.

[0044] As a more preferred specific example, by using the aliphatic diamine compound, for example, it is possible to clean pitch stains caused by organic matter, which adhere to tools such as wires, felts, and press rolls equipped in a papermaking machine in a papermaking process, even if the pitch stains are generated mainly from acrylate-based adhesives, or it is possible to prevent organic pitch, especially pitch caused by acrylate-based adhesives, from adhering to the papermaking process or to devices or tools equipped in the papermaking process.

[0045] Furthermore, the present invention can provide a technology for preventing or cleaning pitch stains adhering to tools such as wires, felts, and press rolls of a papermaking machine by using the aliphatic diamine compound, thereby reducing defects and paper breaks caused by pitch stains. Furthermore, the present invention can provide a technology that uses the aliphatic diamine compound to target one or more selected from papermaking machines, paperboard making machines, and tools provided in such devices or machines, which are prone to pitch stains derived from waste paper. Furthermore, by using the aliphatic diamine compound, the present invention can provide a technology that targets acrylate-based adhesives, which are a main component of pitch derived from waste paper. Furthermore, the present invention can provide a technology for preventing pitch stains from adhering or improving the efficiency of cleaning by incorporating an agent into water or shower water used for tools (e.g., wires, felts, press rolls, etc.) equipped in a papermaking machine using the aliphatic diamine compound.

[0046] According to the present invention, pitch stains on tools in the papermaking process can be reduced, which can improve dewatering efficiency by preventing deterioration of tool performance, reduce defects and paper breaks due to reduced transfer of pitch stains from tools to wet paper or subsequent processes, reduce the frequency and extend the cleaning period of tools or subsequent processes that require the stop of the papermaking machine, reduce the amount of other chemicals used to deal with pitch, and reduce the amount of rejects from screens or cleaners installed for pitch removal. In this way, pitch countermeasures and reduction or suppression of pitch problems in the papermaking process (particularly the papermaking process) can be performed more effectively. This ultimately makes it possible to improve the quality of paper products, improve the efficiency of papermaking operations, and reduce costs in the papermaking process. In the present invention, when the aliphatic diamine compound or a chemical agent containing the compound is used, a defoamer may be further added to the gas-liquid separation tank or drainage channel for the tool cleaning waste liquid, thereby making it possible to prevent a decrease in the gas-liquid separation efficiency and to prevent overflow of the drainage channel.

[0047] Since the aliphatic diamine compound used in the present invention has the above-mentioned functions, for example, pitch stain cleaning function, pitch stain reducing function, pitch stain adhesion prevention function, etc. in the papermaking process, the aliphatic diamine compound can be contained in or used in agents such as a cleaning agent for the papermaking process, a pitch stain reducing agent, or a pitch stain adhesion prevention agent. The present invention can also use the aliphatic diamine compound itself as an agent such as a cleaning agent in the papermaking process described above. The present invention can provide an aliphatic diamine compound or its use for the purpose of cleaning, pitch stain reduction, pitch stain adhesion prevention, etc. in the papermaking process. The aliphatic diamine compound can also be used to manufacture agents or preparations such as the above-mentioned cleaning agent for the papermaking process. The present invention can also provide a cleaning method or pitch stain reducing method, pitch stain adhesion prevention method, or papermaking tool cleaning method in the papermaking process, in which the aliphatic diamine compound is used or added to the papermaking process or the equipment or tool used in the papermaking process.

[0048] The form of the drug used in the present invention is not particularly limited, and may be a liquid, a slurry, or a powder. The drug according to the present invention may also be a composition.

[0049] The method, amount, and location of use of the chemical used in the present invention can be appropriately selected from the methods of the cleaning method and the like according to the present invention described below. Furthermore, in the present invention, when the aliphatic diamine compound or a chemical containing the compound is used, it is preferable to add a defoaming agent to the gas-liquid separation tank or drainage channel for the utensil washing waste liquid.

[0050] The concentration of the aliphatic diamine compound used in the present invention when used in equipment, processes, tools, etc. is not particularly limited, but a more preferred lower limit is preferably 0.1 mg / L or more, more preferably 1 mg / L or more, and a more preferred upper limit is preferably 1000 mg / L or less, more preferably 500 mg / L or less, and more preferably 100 mg / L or less. The agent according to the present invention is mixed and diluted with water or process water (e.g., shower water) to a predetermined polyoxyalkylene aliphatic diamine compound use concentration, and then the diluted solution can be sprayed, immersed, passed, etc., on the tool to be cleaned.

[0051] <Optional ingredients> In this embodiment, in addition to the above-mentioned aliphatic diamine compound, an optional component may be appropriately used in the aqueous system or contained in the agent within a range that does not impair the effects of the present invention. The optional component is not particularly limited, and may be, for example, one or more selected from the group consisting of an organic acid or an organic acid salt, a phosphonic acid or a phosphonic acid salt, a sulfamic acid, an anionic polymer, a surfactant different from the above-mentioned aliphatic diamine compound, a pH adjuster, an antifoaming agent, a bactericide, etc.

[0052] The organic acid is not particularly limited, and examples thereof include citric acid, tartaric acid, malic acid, and salts thereof. The phosphonic acid is not particularly limited, and examples thereof include (1-hydroxyethane-1,1-diyl)diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, and salts thereof. Examples of salts include alkali metal salts (e.g., sodium salt, potassium salt), alkaline earth metal salts (e.g., calcium salt, etc.). One or more selected from these can be used.

[0053] Furthermore, the anionic polymer is not particularly limited, and examples thereof include polymers having one or more groups selected from a carboxyl group, a sulfone group, a sulfinic group, and the like. Examples thereof include polymers or copolymers of acrylic acid, methacrylic acid, maleic acid, 2-hydroxy-3-allyloxy-1-propanesulfonic acid, 2-acrylamido-2-methylpropanesulfone, and the like. One or more groups selected from these may be used. The weight average molecular weight of the anionic polymer is not particularly limited, but is preferably 1000 to 100000, and more preferably 3000 to 30000. The weight average molecular weight of the polymer can be measured by GPC (gel permeation chromatography) analysis, and at this time, a standard substance (standard polyacrylic acid) can be used.

[0054] Furthermore, in this embodiment, for the purpose of enhancing the effect against pitch stains or imparting adhesion prevention and cleaning effects against stains other than pitch, the above-mentioned aliphatic diamine compound and one or more components selected from organic acids or organic acid salts, phosphonic acids or phosphonic acid salts, sulfamic acid, anionic polymers, surfactants other than the above-mentioned aliphatic diamine compound, etc., can be contained in a one-liquid or two-liquid type, or can be used at the same time or separately, and a mixture of these can be used.

[0055] 2. Cleaning method according to the present invention

[0056] In the description of the examples of the cleaning method according to the present invention, the description of each configuration and each processing method of the aliphatic diamine compound, the cleaning agent for papermaking process, the papermaking tool, the papermaking process, the papermaking process, etc., which overlaps with the above-mentioned "1," etc., will be omitted as appropriate, but the description of "1." etc. also applies to this embodiment and can be adopted as appropriate. In addition, in the description of the examples of the method in this embodiment, the description described later can be applied to this embodiment and can be adopted as appropriate. In addition, in this embodiment, for example, "(to)" in "(to) clean the papermaking tool" may be expressed as "process" or "step," and "step" may be expressed as "(to)" or "process," and "process" may be expressed as "(to)" or step. In addition, in this embodiment, the "mechanism" may be expressed as a system, device, or part, the "device" may be expressed as a system, mechanism, or part, and the "part" may be expressed as a part or device to be provided in the mechanism, device, system, etc.

[0057] The method according to the present invention relates to a cleaning method, a paper manufacturing method, etc. The method according to the present invention may be various methods related to pitch stains in the papermaking process (for example, a method for cleaning pitch stains, a method for reducing pitch stains, a method for preventing pitch stain adhesion, etc.), or a method for cleaning papermaking tools, etc.

[0058] It is preferable that the present invention provides a method for cleaning papermaking tools or a method for producing paper, which includes cleaning papermaking tools using an aliphatic diamine compound or an agent containing an aliphatic diamine compound, or using a detergent for the papermaking process containing an aliphatic diamine compound.

[0059] The present invention can also provide a cleaning process, cleaning device, or cleaning mechanism that uses or applies an aliphatic diamine compound or a chemical agent containing an aliphatic diamine compound to a tool (e.g., a felt, a roll, etc.) provided in a papermaking process, papermaking machine, or papermaking mechanism, and the cleaning process, etc. may be incorporated into or provided in a papermaking process, etc. The papermaking process, papermaking machine, or papermaking mechanism preferably includes an inlet, a wire part, a press part, and a dry part, and it is preferable that one or more selected from these are used or applied to the tool.

[0060] Furthermore, the method according to the present invention more preferably includes adding an aliphatic diamine compound or a chemical agent containing the aliphatic diamine compound (hereinafter also referred to as the chemical agent of the present embodiment) to chemical-containing water (preferably shower water) for washing papermaking tools provided in a papermaking machine. The chemical agent of the present embodiment may be, for example, a detergent for papermaking process containing an aliphatic diamine compound. As a method for using the agent of this embodiment, the agent of this embodiment can be added to shower water for washing in the papermaking process.

[0061] The drug-containing water may be, for example, one or more selected from the stock solution, dilution, and concentrated solution of the drug of this embodiment. Examples of the dilution of the drug-containing water include (1) the drug containing the aliphatic diamine compound and (2) tap water, and one or more waters selected from white water, process water, adjustment water, and washing water in the papermaking process. The pH of the drug-containing water is not particularly limited, but is, for example, 4 to 10, preferably 5 to 9, and more preferably 6 to 8. The temperature of the drug-containing water is not particularly limited, but is, for example, 4 to 50°C, preferably 10 to 40°C, more preferably 20 to 40°C, and even more preferably 20 to 30°C.

[0062] The method according to the present invention will be described with reference to FIG. 1, however, the embodiment of the present invention is not limited thereto. The paper production (papermaking process) in the present invention preferably includes a preparation process 2, a papermaking process 10, and a water recovery process for recovering water generated from each of these processes (see, for example, FIG. 1).

[0063] The preparation process 2 includes one or more steps selected from a dissolving step, a dissociation step, a dust removal step (cleaning step, screening step), a concentration step, and a beating step, and is preferably arranged in this order. In the preparation process 2, a raw material 1 such as waste paper can be made into a papermaking raw material through a dissolving step 21 to a beating step.

[0064] The papermaking process preferably includes at least an inlet 12, a paper layer forming process (wire part) 13, a wet dewatering process (press part) 15, and a wet drying process (dry part) 16, and more preferably the processes are arranged in this order. The inlet is configured to supply uniformly dispersed pulp raw material (for example, pulp concentration of about 0.5 to 5%) by uniformly spraying it onto the wire. Furthermore, the papermaking process may include a dust removal process (screening process) 11 configured to remove impurities from the pulp raw material before the inlet 12. Furthermore, after the dryer part, a calendar part, a reel, a cutter, a winder, etc. may be included. Through the papermaking process, paper 5 can finally be made. The papermaking process 10 (each of the processes 12 to 16) is connected to a water recovery process of a primary circulating water 19 and / or a secondary circulating water 20 that recovers water generated during papermaking, such as washing water (for example, pitch- and pulp-containing water, etc.), as white water or recovered water 19.

[0065] In the water recovery process, the water used in the papermaking process 10 is recovered in a storage tank or storage device such as a white water silo 18. The recovered and recyclable water is circulated to the preparation process 2 and / or the papermaking process 10 (e.g., the dust removal process 11, etc.), and unnecessary water may be discharged outside the system as wastewater.

[0066] In the method according to the present invention, the agent of this embodiment can be used in places or locations where pitch stains occur or adhere, or where there is a risk of such occurring. The agent of this embodiment can be applied to any step, location, device, and tool in the papermaking process. For example, it is preferable to add the agent of this embodiment to papermaking tools such as wires, felts, canvases, rolls, and suction rolls, and it is also preferable to add the agent of this embodiment to one or more selected from various tools, various chests, various devices, and various pipes in the papermaking process, and / or to a shower for cleaning and / or preventing dirt in the papermaking process. More preferred specific aspects include one or more selected from the following: adding the agent of this embodiment to chemical pulp, mechanical pulp, or waste paper pulp during the pulp manufacturing process; adding to broken or disc filters in the pulp recovery process; adding to mixing chests, machine chests, seed boxes or inlets, white water silos, seal pits, recovered white water, etc. in the papermaking process; or adding to the flotation process and / or the process preceding it in the deinking treatment in the waste paper pulp manufacturing process.

[0067] The location of the agent of this embodiment in the paper manufacturing process is not particularly limited, but is preferably a location configured to perform stirring or mixing, such as the suction side of a pump that transfers pulp from a tank present in each process. The agent of this embodiment may also be added, for example, to a floatator in the pulp manufacturing process and / or a machine chest in the papermaking process. The agent of this embodiment may also be added or sprayed to a location where pitch stains are attached in the paper manufacturing process, or added or directly sprayed into a tank or pipe installed in the vicinity, and an example of such a tank is a tank for shower water for washing. The agent of this embodiment may also be brought into contact with the location where the pitch stains are attached using a device or mechanism for showering, spraying, spraying, immersion, washing, or the like.

[0068] Furthermore, it is preferable to apply the agent of this embodiment in a papermaking process (preferably a papermaking machine or papermaking tools) where pitch stains (more preferably pitch stains due to acrylate-based adhesives) become severe. The chemical agent of this embodiment is preferably used in one or more selected from the paper layer formation process 13, the wet paper dewatering process 15, and the white water silo (white water storage tank) 18 in the water recovery process.

[0069] In the present invention, when used in the paper layer forming process 13 and / or the wet paper dewatering process 15, it is preferable to directly or indirectly contact the chemical water, such as shower water, washing water, or jet water, containing the chemical of this embodiment, with the tools such as wires, felts, and press rolls, using a device or mechanism such as shower, spray, or spray, as shown in 21a, 21b, and 21c. In addition, in the present invention, the chemical of this embodiment may be added to the white water silo 18 using the pitch control agent adding device 22. In addition, the chemical of this embodiment may be added continuously or intermittently during paper production, or may be added to circulating water or immersion water during washing when the papermaking machine is idle. The exchange tools on standby may be washed by showering or immersing them in the chemical-containing liquid, or the softened deposits after washing may be peeled off by spraying them with high-pressure water or the like.

[0070] In the method according to the present invention, the chemical agent of the present embodiment is added to shower water, and the shower water containing the chemical agent is used in the papermaking process, so that papermaking tools such as papermaking felt in the papermaking process can be washed, and pitch stains can be removed. Also, by using the shower water containing the chemical agent in the papermaking process, the adhesion of pitch stains to papermaking felt and other tools in the papermaking process can be prevented.

[0071] An example of the method according to the present invention is a method for cleaning papermaking tools, but the method according to the present invention is not limited thereto. The wet sheet (e.g., solid content concentration 12 to 20% by mass) that has left the couch roll of the wire part is placed on a papermaking felt in the press part and squeezed between two press rolls. There is no particular limitation on the papermaking felt, but needle felts made of polyamide, polyester, wool, etc. are often used. The moisture content of the wet paper that leaves the press part is usually about 60% by mass, and the wet paper with reduced moisture content after the press part is dried in the dryer part. The papermaking felt that has released the wet paper travels under the press rolls while circulating, is washed during the process, and places the wet sheet on it again.

[0072] In the method of the present invention, there is no particular limitation on the method of applying shower water containing the chemical of this embodiment to the papermaking tool, and for example, one or more types selected from a full-width shower, a high-pressure moving needle shower, a low-pressure needle shower, etc. can be used. One aspect of the method for cleaning papermaking felt of the present invention will be described below, but the present embodiment is not limited thereto, and the method may be a method for cleaning pitch stains on papermaking felt or a method for preventing pitch stains from adhering to the papermaking felt. In addition, in some or all of the following steps using shower water, it is preferable that the shower water appropriately contains the agent of the present embodiment. The papermaking felt is first cleaned by a high-pressure moving needle shower. The high-pressure moving needle shower can dissolve dirt adhering to the outside of the papermaking felt by spraying shower water from the inside of the papermaking felt at a water pressure of 2,000 to 3,000 kPa while the spray nozzle moves in the width direction of the papermaking felt. The shower water that passes from the inside to the outside of the papermaking felt can be sucked by a suction box. It is preferable that the high-pressure moving needle shower is provided with an interlock mechanism between the papermaking felt and the spray of shower water is stopped when the papermaking felt stops, thereby preventing damage to the papermaking felt.

[0073] Next, shower water is supplied from the full-width shower equipped with a fan nozzle from the inside across the entire width of the papermaking felt at a water pressure of 200 to 500 kPa, a sufficient amount of shower water is absorbed into the papermaking felt, foreign matter and clogging components are pushed out, and the foreign matter adhering to the surface of the papermaking felt can be removed by suction using a suction box. Furthermore, shower water is sprayed from the outside of the papermaking gel at a water pressure of about 800 kPa while moving a low-pressure needle moving shower in the width direction of the papermaking felt, and foreign matter adhering to the surface of the papermaking felt can be scraped off. Finally, shower water is supplied from the full-width shower provided on the inside of the papermaking felt and from the full-width shower provided on the outside, and the shower water is sucked up using one or more suction boxes to complete the washing of the papermaking felt.

[0074] As a result, by spraying shower water containing the chemical agent of this embodiment onto the papermaking felt, pitch stains adhering to the papermaking felt can be more effectively cleaned, and / or the chemical agent of this embodiment can come into contact with the papermaking felt to more effectively prevent pitch stains from adhering to the papermaking felt.

[0075] In the method according to the present invention, for example, the method for cleaning or preventing pitch stains, the concentration of the aliphatic diamine compound in the shower water is not particularly limited, but a more preferred lower limit is preferably 0.1 mg / L or more, and even more preferably 1 mg / L or more, and a more preferred upper limit is preferably 1000 mg / L or less, more preferably 500 mg / L or less, and even more preferably 100 mg / L or less. The agent according to the present invention can be used after being mixed and diluted with shower water to a predetermined concentration of the polyoxyalkylene aliphatic diamine compound to be used.

[0076] The chemical-containing water containing the chemical of this embodiment is used in a desired process, and then flows as waste liquid into a gas-liquid separation tank or drainage channel for the utensil washing waste liquid, where it is treated until it can be discharged, and then is finally discharged outside the system. When using the chemical of this embodiment, it is preferable to add a defoaming agent to the gas-liquid separation tank or drainage channel for the utensil washing waste liquid, which can prevent a decrease in gas-liquid separation efficiency and overflow into the drainage channel.

[0077] The method according to the present embodiment can also be realized by a device or control unit including a CPU in a device for managing the cleaning status (e.g., a computer, PLC, server, cloud service, etc.). The method according to the present embodiment can also be stored as a program in hardware resources including a recording medium (non-volatile memory (SSD, USB memory, etc.), HDD, CD, DVD, Blu-ray disc, etc.) and realized by a control unit. It is also possible to provide a device including the control unit or the system, such as a management system for the cleaning status, which controls the control unit to add a predetermined amount of chemical to the target. The management device may also include an input unit such as a keyboard, a communication unit such as a network, a display unit such as a display, etc.

[0078] An apparatus for managing the cleaning status etc. or a management system for the cleaning status etc. may include an input unit such as a keyboard, a communication unit such as a network, an output unit such as a display, a storage unit such as a HDD, the above-mentioned cleaning apparatus, etc. The apparatus or system preferably includes an input unit, an output unit, and a storage unit, and further preferably includes a communication unit and / or a cleaning unit. The input unit can receive user operations by an operator who performs the method of the present embodiment. The input unit can include, for example, a mouse and / or a keyboard. In addition, the display surface of the display device may be configured as an input unit that receives touch operations. The output unit can output the cleaning status and related information (e.g., a table, a diagram, an explanatory text, etc.) The output unit can be, for example, a display device that displays an image, a speaker that outputs sound, a printer that prints on a print medium such as paper, etc., but is not limited to these. The storage unit can store data input by an operator, data set for viewing a cleaning status, etc. The storage unit may include, for example, a recording medium. The cleaning status management system according to the present embodiment can be executed by using a program and hardware. An embodiment of the computer 1 according to the present embodiment (not shown) is not limited to this, but may include at least a CPU as a component of the computer 1, and may further include one or two components selected from a RAM, a storage unit, an output unit, an input unit, a communication unit, a ROM, and a measurement unit, among which it is preferable to include a RAM, a storage unit, an output unit, and an input unit, and it is preferable to further include at least one of a communication unit, a measurement unit, a ROM, etc. Each component is preferably connected by a bus as a data transmission path, for example.

[0079] The washing system in paper manufacturing or the paper manufacturing system according to this embodiment is preferably provided with a management device for the washing status, etc., that has at least the control unit described above. The washing status management system of this embodiment may further include a communication unit that allows wireless and / or wired transmission and reception between the control unit or the washing status management device that has the control unit and other units or other devices.

[0080] The present technology can also employ the following configuration. [1] A cleaning agent for the papermaking process containing an aliphatic diamine compound. [2] The cleaning agent for the papermaking process according to [1], wherein the aliphatic diamine compound is a diamine compound having one or two substituted or unsubstituted aliphatic hydrocarbon groups. [3] The cleaning agent for the papermaking process according to [1] or [2], wherein the aliphatic diamine compound is a polyoxyalkylene aliphatic diamine. [4] The detergent for the papermaking process according to any one of [1] to [3] above, used for cleaning papermaking tools used in a papermaking process. The papermaking tools are preferably tools for equipment installed in one or more selected from a paper layer forming process, a wet paper dewatering process, and a water recovery process, and more preferably one or more selected from a wire, a felt, and a roll (such as a press roll).

[0081] [5] An aliphatic diamine compound or its use for producing a detergent for papermaking process, or for use in producing said detergent. The aliphatic diamine compound is preferably any one of the above [1] to [4]. [6] Use of an aliphatic diamine compound in a detergent for papermaking process. The aliphatic diamine compound is preferably any one of the above [1] to [4]. [7] An aliphatic diamine compound for use in cleaning in a papermaking process, or for use in cleaning in a papermaking process. The aliphatic diamine compound is preferably any one of the above [1] to [4]. [8] A method for cleaning a papermaking process or a method for cleaning papermaking tools used in a papermaking process, using an aliphatic diamine compound or a papermaking process cleaner containing the same. The aliphatic diamine compound is preferably any one of the above [1] to [4].

[0082] [9] A method for cleaning papermaking tools, comprising cleaning papermaking tools using an aliphatic diamine compound or a chemical agent containing the same, or using the detergent for the papermaking process according to any one of [1] to [4] above.

[10] The method for cleaning papermaking tools according to [9], comprising adding the aliphatic diamine compound or a chemical agent containing the aliphatic diamine compound, or the papermaking process cleaner to a cleaning liquid (preferably shower water) for cleaning papermaking tools provided in a papermaking machine.

[11] A method for cleaning papermaking tools, comprising using a cleaning liquid or shower water to which the aliphatic diamine compound or a chemical agent containing the aliphatic diamine compound, or the cleaning agent for the papermaking process, has been added. The cleaning liquid can be used for spraying or spraying with a spraying device, immersion in a cleaning liquid storage tank, or passage through a cleaning liquid storage tank. The shower water is preferably shower water for cleaning papermaking tools provided in a papermaking machine. The shower water is preferably sprayed, sprayed, or sprayed from a cleaning device configured to clean papermaking tools by spraying, spraying, or spraying.

[12] A method for producing paper, comprising cleaning a papermaking tool using a chemical agent containing an aliphatic diamine compound, or using the detergent for the papermaking process according to any one of [1] to [4] above. EXAMPLES

[0083] The following examples and comparative examples are provided to illustrate the present invention, but the scope of the present invention is not limited to these examples.

[0084] In this test, the insoluble components of neutral rosin or acrylate dispersed in the dispersion were assumed to be the resin (pitch) contained in waste paper. The neutral rosin was a neutral rosin sizing agent CC1401 (anionic rosin derived from rosin resin) manufactured by Seiko PMC, and the acrylate was A-6001 (high-concentration aqueous acrylate-based adhesive) manufactured by Resitex. They were diluted to a ratio that made the turbidity of the dispersion 500-1000 NTU. A turbidimeter capable of measuring at least 0-1000 NTU (Nephelometric Turbidity Unit) was used, and formazin was used as the turbidity standard solution. Resitex A-6001: Milky white emulsion, 63-67% concentration, pH 5-7, viscosity (mPa.s: 20℃) 10,000-16,000.

[0085] When the insoluble components of neutral rosin and acrylate dispersed in the dispersion are dissolved by the agent, the turbidity decreases compared to before the agent was added. Since the turbidity may decrease even if the components aggregate, the presence or absence of aggregates was confirmed visually, and data was used only when no aggregates were formed. Agents with high dissolving power have a high cleaning effect on pitch caused by the corresponding components (e.g., neutral rosin, acrylate) adhering to tools used in the papermaking process.

[0086] In this test, Dispersion 1 in which neutral rosin was dispersed and Dispersion 2 in which acrylate was dispersed were prepared so as to have a turbidity of 500 to 1000 NTU. <Examples 1 to 3: Drug A> As shown in Tables 1 and 2, the neutral rosin dispersion 1 was added with the agent A and reacted with stirring for 1 hour, and the turbidity of the sample was measured (Example 1-1, Example 2-1, Example 3-1). After adding the agent A, 100 mL of the neutral rosin dispersion 1 containing the agent A was placed in a 100 mL beaker, and after adding the agent, the mixture was stirred for 1 hour at a rotation speed of 800 rpm with a magnetic stirrer with a length of 2 cm. The water temperature in the test was 25° C. and the pH was 7.0. In addition, except that the neutral rosin dispersion 1 was replaced with the acrylate dispersion 2, the turbidity change of the sample was measured before and after the addition of the drug A to the acrylate dispersion 2 in the same manner as in Examples 1-1 to 3-1 (Examples 1-2, 2-2, and 3-2). In this test, the turbidity reduction rate (%) can be calculated by [turbidity of dispersion before addition of drug (NTU) - turbidity of dispersion after addition of drug (NTU)] / turbidity of dispersion before addition of drug (NTU) x 100.

[0087] Comparative Example 1: Drug B The change in turbidity of a sample of neutral rosin dispersion 1 before and after the addition of agent B was measured in the same manner as in Example 3-1, except that the agent added to neutral rosin dispersion 1 was changed from agent A to agent B as shown in Tables 1 and 2 (Comparative Example 1-1). In addition, the change in turbidity of a sample of acrylate dispersion 2 before and after the addition of agent B was measured in the same manner as in Comparative Example 1-1, except that neutral rosin dispersion 1 was changed to acrylate dispersion 2 (Comparative Example 1-2).

[0088] Comparative Example 2: Drug C The turbidity of a sample of neutral rosin dispersion 1 before and after the addition of chemical C was measured in the same manner as in Example 3-1, except that the chemical added to neutral rosin dispersion 1 was changed from chemical A to chemical C as shown in Tables 1 and 2 (Comparative Example 2-1). In addition, the turbidity change of a sample of acrylate dispersion 2 to which chemical C was added was measured before and after the addition of chemical C in the same manner as in Comparative Example 2-1, except that neutral rosin dispersion 1 was changed to acrylate dispersion 2 (Comparative Example 2-2).

[0089] <Comparative Examples 3 to 5: Drug D> The turbidity change of the sample of neutral rosin dispersion 1 before and after the addition of chemical D was measured in the same manner as in Examples 1-1 to 3-1, except that the chemical added to neutral rosin dispersion 1 was changed from chemical A to chemical D as shown in Tables 1 and 2 (Comparative Example 3-1, Comparative Example 4-1, Comparative Example 5-1). In addition, the turbidity change of the sample of acrylate dispersion 2 before and after the addition of chemical D was measured in the same manner as in Comparative Examples 3-1, 4-1, and 5-1, except that neutral rosin dispersion 1 was changed to acrylate dispersion 2 (Comparative Example 3-2, Comparative Example 4-2, Comparative Example 5-2).

[0090] [Table 1]

[0091] [Table 2]

[0092] In terms of turbidity reduction rate, the aliphatic diamine-based chemical A was equal to or greater than the polyoxyalkylene alkyl ether-based chemical B, polyoxyalkylene-based chemical C, and aliphatic amine-based chemical D, which are generally used as papermaking tool cleaners in terms of their turbidity reduction effect on neutral rosin (Examples 1-1 to 3-1, Comparative Examples 1-1 to 5-1). In addition, while chemicals B, C, and D were ineffective against acrylates, which are often detected in defects (spots) and deposits on paperboard, which is made primarily from recycled paper, chemical A was effective (Examples 1-2 to 3-2).

[0093] Therefore, it was found that the aliphatic diamine compound has the effect of dissolving the neutral rosin suspension and the acrylate suspension in an aqueous solution. In particular, it was found that the acrylate suspension was difficult to dissolve with other chemicals, but the aliphatic diamine compound can easily dissolve it. From this, the aliphatic diamine compound has an unprecedented and very excellent effect of cleaning and preventing the adhesion of pitch stains, even if the pitch stains are acrylate-based. Therefore, the aliphatic diamine compound can be used to clean and prevent the adhesion of pitch stains, especially acrylate-based pitch stains, and this makes it possible to prevent, suppress or reduce pitch problems occurring in paper manufacturing and to better implement pitch countermeasures. [Explanation of symbols]

[0094] 1 raw material, 2 preparation process, 5 paper, 10 papermaking process, 11 dust removal process, 12 inlet, 13 wire part, 14 wet sheet, 15 press part, 16 dry part, 17 white water, 18 white water silo, 19 primary circulating water, 20 secondary circulating water, 22 pitch control agent

Claims

1. A cleaning agent for the papermaking process containing an aliphatic diamine compound.

2. The cleaning agent for papermaking process according to claim 1, wherein the aliphatic diamine compound is a diamine compound having one or more aliphatic hydrocarbon groups.

3. The papermaking process cleaner according to claim 1 or 2, wherein the aliphatic diamine compound is a polyoxyalkylene aliphatic diamine.

4. A method for cleaning a papermaking tool, comprising cleaning the papermaking tool with a chemical agent containing an aliphatic diamine compound.

5. A method for producing paper, comprising cleaning papermaking equipment with a chemical containing an aliphatic diamine compound.

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