JP4266215B2 - Paper machine wire life extender and paper machine wire life extension method - Google Patents

Description

  The present invention relates to a paper machine wire life-extending agent capable of reducing wear, which is particularly noticeable at a wire ear (trim) of a paper machine, and a life extension method thereof.

  Generally, in a papermaking process in a paper mill, a paper material (pulp fiber suspension) having a concentration of 1 to 2% is discharged from a head box or a stock inlet onto a continuously running metal wire or plastic wire. Most of the moisture in the paper is drained from the eyes of the wire due to its own weight while traveling on the wire, or is removed to about 80% by suction water from hydrofoil, wire suction box, couch roll, etc. The wet paper is fed into the press part of the next process. In the press part, the wet paper is placed on a continuously running felt and pressed by a roll to further remove moisture by suction. The wet paper that has exited the press part is sent to the dryer part which is the next process, and the front and back are alternately pressed against a plurality of heating rolls to be dried to form paper. Figure 1 shows an example of the wire part of an on-top twin-wire paper machine. Hereinafter, the problem of the wire part will be described by taking an on-top twin wire paper machine as an example.

  In the wire part shown in FIG. 1, the wire W carries the paper material discharged from the head box 1, the breast roll 2, the forming board 3, the hydrofoil 4, the wire suction boxes 5 and 6, the couch roll 7, and the wire turning. Along the roll 9, the wire return roll 10, the stretch rolls 11 and 13, and the guide roll 12, it continuously circulates for a long time. In particular, strong friction is generated between the wire W and the wire suction box 5, the couch roll 7, and the forming board 3, which promotes wear of the wire W. Needless to say, this wear is one of the most important factors affecting the life of the wire W.

  In papermaking, fillers such as talc, kaolin, heavy calcium carbonate, and light calcium carbonate are added to the paper for the purpose of improving the opacity and whiteness of the resulting paper product. Has entered the eye of the wire W or between the wire W and the suction box 5 to further promote wear of the wire W. Regarding the problems caused by these fillers, a method of adding silica sand to the following Patent Document 1 and a method of adding alumina or zirconia to the following Patent Document 2 are disclosed. It is described that it is effective in reducing promoted wear.

  However, in addition to the portion on which the paper layer is placed (the portion indicated by reference numeral 14 in FIG. 2), the wire is a portion where a paper layer having a width of about 20 cm from the both ends of the wire is not placed, so-called ear (trim) (reference numeral 15 in FIG. Part). In addition, this ear is easier to dry than the part on which the wet paper layer is placed, so the frictional resistance is greater, and the wear progresses faster than the part on which the paper layer is placed as the number of days of use elapses, reducing the life of the wire. Is a problem. In addition, since no paper layer is placed on the ear portion, the method of using the internally added chemical described in the following patent document is completely ineffective.

Japanese Patent Laid-Open No. 08-144190 Japanese Patent Laid-Open No. 10-298894

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wire life extending agent capable of reducing the wear of ears (trims) that wear particularly quickly in the wire of a paper machine and extending the life of the wire itself, and a method for extending the life. is there.

  As a result of intensive studies to solve the above problems, the present inventors have obtained (a) from the group consisting of hydrocarbons, animal and vegetable oils and fats, waxes, higher alcohols, silicon oils, fatty acids and fatty acid salts. At least one lubricating component selected, (b) at least one surfactant selected from the group consisting of cationic surfactants, anionic surfactants, amphoteric surfactants and nonionic surfactants, and solvents Is added to the ears (trims) at both ends of a plastic or metal paper machine wire, which has the effect of reducing noticeable wear, particularly at the wire ears. The facts were found and the present invention was completed. An ear | edge part means the area | region of 1 cm-20 cm from the both ends which are easy to produce abrasion normally.

  According to the present invention, by adding a paper machine wire life prolonging agent to the ear part (usually 1 cm to 20 cm wide part from both ends of the wire) that is most likely to be worn in each part of the paper machine wire. This has the effect of reducing wear and extending the life of the wire itself.

  Hereinafter, the paper machine wire life extending agent of the present invention and the method of using the same will be described in detail.

The paper machine wire life-extending agent of the present invention comprises a composition containing the following components (a), (b), and a solvent, and is added to the ear part (trim) that is particularly worn in the paper machine wire. belongs to.
(A) At least one lubricating component selected from the group consisting of hydrocarbons, animal and vegetable oils, waxes, higher alcohols, silicone oils, fatty acids, and fatty acid salts.
(B) At least one surfactant selected from the group consisting of a cationic surfactant, an anionic surfactant, an amphoteric surfactant, and a nonionic surfactant.

  Examples of the hydrocarbons as the lubricating component of the component (a) used in the present invention include paraffin wax, isoparaffin wax, polyethylene wax, microcrystalline wax, mineral oil, liquid paraffin, squalane and the like. , Pork fat, olive oil, camellia oil, castor oil, soybean oil, sulfurized rapeseed oil, etc., waxes include beeswax, carnauba wax, lanolin, etc., higher alcohols include stearyl alcohol, cetyl alcohol, Examples include oleyl alcohol, silicone oil includes dimethylpolysiloxane or a chemically modified product thereof (for example, amino-modified dimethylpolysiloxane), and fatty acids include stearic acid, palmitic acid, oleic acid, linoleic acid, and the like. Fatty acid salts Sodium phosphate, potassium oleate, triethanolamine salts of oleic acid.

  Examples of the cationic surfactant of component (b) used in the present invention include alkyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride, alkyldimethylethylammonium ethyl sulfate, higher alkylamine salts (such as acetate and hydrochloride), and higher alkyls. Ethylene oxide adduct to amine, condensate of higher fatty acid and polyalkylene polyamine (for example, 1: 1 (molar ratio) condensate of oleic acid and pentaethylenehexamine), salt of ester of higher fatty acid and alkanolamine (For example, stearic acid triethanolamine ester formate), higher fatty acid amide salt (for example, stearamide ethyl diethylamine acetate), higher fatty acid and aminoethylethanolamine are heat-condensed, and urea is further bonded to this. Then, a salt neutralized with acetic acid (for example, a cationic surfactant such as Arcobel A-type or G-type), an imidazoline-type cationic surfactant (for example, 2-heptadecenylhydroxyethylimidazoline), alkylpyridinium Examples include salts.

  Examples of the anionic surfactant (b) used in the present invention include higher alcohol sulfates, higher alkyl ether sulfates, α-olefin sulfates, alkylbenzene sulfonates, α-olefin sulfonates, and fatty acids. A reaction product of a halide and N-methyl taurine, a dialkyl ester salt of sulfosuccinic acid, a higher alcohol phosphoric acid ester salt, a phosphoric acid ester salt of a higher alcohol ethylene oxide adduct, and the like can be mentioned. The salt referred to herein includes an alkali metal salt, an alkaline earth metal salt, an ammonium salt or an alkanolamine salt having 1 to 5 carbon atoms, and an acid type (an acid itself that does not form a salt).

  Examples of the amphoteric surfactant (b) used in the present invention include amino acid-type amphoteric surfactants such as sodium laurylaminopropionate and betaine-type amphoteric surfactants such as lauryldimethylbetaine.

  The nonionic surfactant of component (b) used in the present invention is preferably an alkylene oxide adduct to a compound having active hydrogen. In the present invention, examples of the active hydrogen-containing compound include aliphatic alcohols, alkylphenols, sorbitan fatty acid esters, glycerin fatty acid esters, pentaerythritol fatty acid esters and the like, polyhydric alcohol fatty acid esters, fatty acids, fatty acid amides, and the like. Can do. Here, the fatty acid may be either saturated or unsaturated.

  Therefore, in the present invention, as described above, the nonionic surfactant is composed of an alkylene oxide adduct to a compound having active hydrogen, such as an alkylene oxide addition to an aliphatic alcohol. Polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl phenyl ethers added to alkylphenols, polyoxyalkylene sorbitan fatty acid esters added to sorbitan fatty acid esters, polyoxyalkylene adducts to glycerin fatty acid esters Alkylene glycerin fatty acid ester, polyoxyalkylene pentaerythritol fatty acid ester which is an adduct to pentaerythritol fatty acid ester, polyoxyalkylene fatty acid ester which is an adduct to fatty acid, fat Polyoxyalkylene fatty acid amide is an adduct of the acid amide can be mentioned.

  In the present invention, the alkylene oxide adduct to the compound having active hydrogen as the nonionic surfactant is, as an oxyalkylene group contained in the molecule, an oxyethylene group, an oxypropylene group and an oxybutylene group. What consists of 1 type, or 2 or more types of combinations chosen is used preferably. The alkylene oxide adduct having two or more oxyalkylene groups contained in the molecule may be either a block copolymer or a random copolymer.

  Examples of the solvent used in the present invention include water, ethanol, propylene glycol, diethylene glycol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, propylene carbonate, and the like. Can do. In addition, water is preferably used from the viewpoint of easy addition by dilution with warm water and the safety and hygiene.

  As a manufacturing method of the paper machine wire life-extension agent composition of the present invention, for example, when using water as a solvent, in a stainless beaker provided with a TK homomixer (made by Special Mechanization Co., Ltd.) and a thermostat additional heat device, A predetermined amount of the lubricating component (a) and the surfactant component (b) were added and stirred. After heating to 60 ° C., the number of revolutions of the TK homomixer was increased to 5000 rpm and stirred vigorously. A target composition can be obtained as an oil-in-water emulsion by adding a constant amount of 60 ° C. warm water little by little and performing phase inversion emulsification. In addition, when propylene carbonate is used as a solvent, after adding a predetermined amount of propylene carbonate to a stainless steel beaker equipped with a stirrer with a propeller shaft (DC Stirrer MDC-NS manufactured by EYELA) and a thermostat heating device, A predetermined amount of the lubricating component (a) and the surfactant component (b) is added and dissolved by stirring at 40 to 50 ° C. to obtain the desired composition as a solution.

  Moreover, in this invention, in addition to the said mixing | blending of a paper machine wire life extension agent, you may contain the other additive conventionally used as a paper machine wire washing | cleaning agent or a stain adhesion preventing agent. Examples of such additives include various cationic polymers, various hydroxy organic acids such as malic acid, tartaric acid and lactic acid, organic phosphonic acids such as 1-hydroxyethylidene-1,1-diphosphonic acid, and inorganic acids such as sulfamic acid. Etc. Further, it may contain an antibacterial agent such as 1-methylisothiazolin-3-one, a humectant such as glycerin or polyethylene glycol, or a foam suppressor.

  In the present invention, the component (a) is contained in the wire life-extension agent composition in an amount of 1 to 60% by weight, preferably 5 to 50% by weight, more preferably 10 to 45% by weight, and the component (b) is 0.5%. It is good to contain -70 weight%, Preferably it is 1-60 weight%, More preferably, it is 2-55 weight%. Further, the solvent should be contained in an amount of 1 to 99% by weight, preferably 1 to 95% by weight, more preferably 2 to 90% by weight.

The wire life-prolonging agent composition of the present invention as described above can be applied to various paper machine wires such as a long mesh wire, a round mesh wire, an on-top twin wire, and a velve former twin wire. Moreover, although there are plastic and metal materials for the wire, the wire life-prolonging agent composition of the present invention can be used for any wire. Of each part of these paper machine wires, the ears (trims) from 1 cm to 20 cm from the two ends that are most likely to be worn are diluted with a stock solution of the paper machine wire life-extension agent composition or a solvent such as water at an appropriate magnification. It is preferable to add a dilute solution to reduce friction at the time of contact between the wire ear and each roll to prevent wear. The addition method is not particularly limited, and any of various methods such as dripping, spraying, showering, and coating can be used.
In addition, when spraying water dilution liquid, install an appropriate spraying device at the ears at both ends of the wire, and continuously press the stock solution of paper machine wire life-extending agent into the spray water piping using a metering pump etc. You can also

  The amount (solid content) of the paper machine wire life-extending agent of the present invention is a paper machine wire that runs at a paper making speed of 20 to 2000 m / min. For example, when the wire ear is heavily worn around 5 cm from both ends of the wire. 0.025 to 2.5 g / min, preferably 0.125 to 1.25 g / min. Here, the amount used (solid content) represents the total weight of the lubricating component (a) and the surfactant component (b) in the paper machine wire life-extension agent composition. When the amount of paper machine wire life-extending agent used per 5 cm width (solid content) is less than 0.025 g / min, a sufficient wire life-prolonging effect may not be obtained. On the other hand, if the amount of paper machine wire life-extending agent per 5 cm width (solid content) exceeds 2.5 g / min, the amount of lubricant component on the wire ears will be excessive, which may lead to wire contamination. is there. Moreover, when diluting and using the paper machine wire life extension agent of this invention, it is good to dilute in the ratio of 5-100 weight part of solvents, such as water, with respect to 1 weight part of this agent.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited only to a following example.
(Paper machine wire life extension composition)

  In a stainless beaker equipped with a TK homomixer (manufactured by Tokushu Kika Co., Ltd.) and a thermostat addition heat apparatus, rapeseed oil and paraffin wax as a lubricating component, and dodecyl alcohol ethylene oxide (8 mol) propylene as a surfactant component Oxide (2 mol) adducts were added in parts by weight as shown in Table 1, and the liquid temperature was raised to 60 ° C. while stirring at 1000 rpm. While maintaining the liquid temperature at 60 ° C., the stirring speed was increased to 5000 rpm, and 60 ° C. warm water was added little by little to effect phase inversion emulsification. After adding the whole amount of warm water (35 parts by weight), the stirring speed was lowered to 1000 rpm and stirring was performed for 30 minutes to obtain the desired composition.

  To a stainless steel beaker equipped with a stirrer with a propeller shaft (DC Stirrer MDC-NS manufactured by EYELA) and a thermostat heating device, 72 parts by weight of water was added and heated to 70 ° C., and then the heating was stopped. , Ammonium salt of mixed fatty acid (carbon number 12-18) as lubricating component, and dodecyl alcohol ethylene oxide (8 mol) propylene oxide (2 mol) adduct and sodium polyoxyethylene allyl sulfonate as surfactant component Each part by weight shown in Table 1 was added, stirred until completely dissolved, and cooled to room temperature to obtain the desired composition.

In a stainless beaker equipped with a TK homomixer (manufactured by Tokushu Kika Co., Ltd.) and a thermostat heating device, rapeseed oil and polyethylene wax as lubricating components, lauryldimethylbenzylammonium chloride as a surfactant component, and dodecyl alcohol Ethylene oxide (8 mol) and propylene oxide (2 mol) adducts were added in parts by weight as shown in Table 1, and the liquid temperature was raised to 80 ° C. while stirring at 1000 rpm. While maintaining the liquid temperature at 80 ° C., the stirring speed was increased to 5000 rpm, and warm water at 80 ° C. was added little by little to effect phase inversion emulsification. After adding the whole amount of warm water (35 parts by weight), the stirring speed was lowered to 1000 rpm and stirring was performed for 30 minutes to obtain the desired composition.

For comparison, cleaning component solutions shown in Table 2 were prepared and used as comparative examples. In addition, the comparative example 1 has shown no chemical | medical agent addition (blank).

<Real machine test>
Using a paper machine for liner paper making (model: bell bond former, mesh width: 6,900 mm), the effects of the paper machine wire life-extending agent of Examples 1 to 3 and the agents of Comparative Examples 1 to 3 were examined. The drug is 1.0 g (solid content) / min per approximately 20 cm width of the wire ear portion, and is metered into a hot water pipe that is guided to the spray device installed in the wire ear portion shown in FIG. 1 and FIG. 2 (arrow A). And sprayed continuously during the wire use period. At this time, the basis weight of the papermaking was 230 g / m ² , the papermaking speed was 500 m / min, and the amount of shower water was 500 ml / min. The wire life extension effect was evaluated by comparing the maximum wear amount of the wire ears in the number of days in which Comparative Example 1 (blank) was a limit. The results are shown in Table 3. In addition, it was 120 days after wire attachment that the comparative example 1 (blank) reached | attained the limit amount of wear (0.34 mm).

  From Table 3, the paper machine wire life-extending agents shown in Examples 1, 2, and 3 are compared to the blank (Comparative Example 1) and Comparative Examples 2 to 3, both ears of the paper machine wire (front ear, back ear). ) Wear is suppressed. Moreover, when investigation of the wire useable days was further continued for Examples 1 to 3, the use days could be extended by 30 days or more from Comparative Example 1 (blank).

It is the schematic which shows an example of a structure of the wire part of an on-top type twin wire paper machine. It is a principal part perspective view which shows the site | part by which the shower water dilution liquid of the paper machine wire life-extending agent of this invention is sprayed between the stretch roll 13 and the breast roll 2 in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Head box, 2 ... Breast roll, 3 ... Forming board, 4 ... Hydrofoil, 5 ... Wire suction box, 6 ... Wire suction box, 7 ... Couch roll, 8 ... pickup roll, 9 ... wire turning roll, 10 ... wire return roll, 11 ... stretch roll, 12 ... guide roll, 13 ... stretch roll, 14 ... wire Sheet part to be paper-made, 15 ... wire ear, w ... wire, A (arrow) ... treated part of paper machine wire life-extending agent (diluent) of the present invention

Claims (2)

A paper machine wire life-extending agent for addition to ears at both ends of a plastic or metal paper machine wire, comprising the following component (a), component (b), and a solvent.
(A) At least one lubricating component selected from the group consisting of hydrocarbons, animal and vegetable oils, waxes, higher alcohols, silicone oils, fatty acids and fatty acid salts.
(B) At least one surfactant selected from the group consisting of a cationic surfactant, an anionic surfactant, an amphoteric surfactant and a nonionic surfactant. A method for extending the life of a paper machine wire, comprising adding the paper machine wire life-extending agent according to claim 1 to ears at both ends of a plastic or metal paper machine wire.

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