CN114402107A - Method for producing pulp sheet and dewatering improver for pulp slurry - Google Patents
Method for producing pulp sheet and dewatering improver for pulp slurry Download PDFInfo
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- CN114402107A CN114402107A CN202080064666.7A CN202080064666A CN114402107A CN 114402107 A CN114402107 A CN 114402107A CN 202080064666 A CN202080064666 A CN 202080064666A CN 114402107 A CN114402107 A CN 114402107A
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- 239000013055 pulp slurry Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- -1 polyoxypropylene Polymers 0.000 claims abstract description 39
- 238000001035 drying Methods 0.000 claims abstract description 24
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 21
- 229920001577 copolymer Polymers 0.000 claims abstract description 18
- 229920001519 homopolymer Polymers 0.000 claims abstract description 14
- 229920001451 polypropylene glycol Polymers 0.000 claims abstract description 9
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 20
- 125000000217 alkyl group Chemical group 0.000 claims description 19
- 125000004432 carbon atom Chemical group C* 0.000 claims description 16
- 229920001400 block copolymer Polymers 0.000 claims description 8
- 229920000642 polymer Polymers 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 23
- 238000000034 method Methods 0.000 description 17
- 239000004094 surface-active agent Substances 0.000 description 16
- 229920000620 organic polymer Polymers 0.000 description 8
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 5
- 125000002091 cationic group Chemical group 0.000 description 4
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000007259 addition reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 150000005215 alkyl ethers Chemical class 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 125000001165 hydrophobic group Chemical group 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000004931 aggregating effect Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000012653 anionic ring-opening polymerization Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011899 heat drying method Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920000428 triblock copolymer Polymers 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/53—Polyethers; Polyesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F13/00—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
Providing: a method for producing a pulp sheet and a dewatering improver for pulp slurry, which can sufficiently reduce the water content before a drying section. A method for producing a pulp sheet by passing a pulp slurry containing an ether-type nonionic surfactant through a wire section, a press section and a drying section and dewatering the pulp slurry, and a dewatering improver for pulp slurry containing an ether-type nonionic surfactant which is a homopolymer of polyoxypropylene or a copolymer having a polyoxyethylene chain and a polyoxypropylene chain in a structural unit and having a polyoxypropylene chain content of 85 mass% or more.
Description
Technical Field
The present invention relates to a method for producing a pulp sheet and a dewatering improver for pulp slurry.
Background
Pulp produced by pulp mills is processed into sheets and stored in the form of pulp sheets. The drying method of the pulp sheet includes heat drying, but is not preferable from the viewpoint of production cost because the fuel consumption amount increases only by the drying by heating.
Therefore, the pulp sheet is generally dewatered by passing through the wire section, the press section, and the dryer section, but the pulp sheet is required to be easily loosened after being used by being redissociated, and therefore, the operation of dewatering by applying a large pressure as in a papermaking machine is not generally performed. That is, in the press section, it is necessary to gradually perform dewatering, and in the subsequent drying section (drying step), water is evaporated, and therefore, heat is required for this. Specifically, a large amount of fuel such as heavy oil is required.
As a conventional method, in order to improve drainage (dewatering property) in a press section of a paper machine, the following operations are performed: organic polymers are added to pulp slurry to form flocs to improve drainage. That is, the method is a method of using an organic polymer as an aggregating agent to aggregate pulp to form flocs and to improve drainage. Various treatment methods are known in which an inorganic substance such as colloidal silica is combined with an organic polymer to form flocs (non-patent document 1).
However, in a machine for producing a pulp sheet sold as a pulp raw material, addition of an organic polymer which changes the charged state of pulp, colloidal silica which becomes scale, or the like has an influence on the pulp quality, and therefore, it is not preferable.
Documents of the prior art
Non-patent document
Non-patent document 1: journal of pulp technology association, page 9, No. 2 month 2004
Disclosure of Invention
Problems to be solved by the invention
As described above, in the paper making method using the paper machine, the organic polymer used for dewatering affects the pulp quality, and therefore, is not suitable for the production method of the pulp sheet. Therefore, it is difficult to reduce the water content of the sheet-like pulp before the drying section, and a large amount of heat, for example, a large amount of fuel such as heavy oil is required for evaporation of water in the drying section.
In the present specification, the pulp sheet is referred to as a sheet-like pulp before passing through the drying section, and the pulp sheet is referred to as a pulp sheet after passing through the drying section and drying.
In view of the above problems, an object of the present invention is to provide a method for producing a pulp sheet by passing pulp slurry through a wire section, a press section and a drying section and dewatering the pulp slurry, the method comprising: a method for producing a pulp sheet and a dewatering improver for pulp slurry, which can reduce the water content before the drying section (in the state of sheet-like pulp).
Means for solving the problems
That is, the present invention provides the following (1) to (9).
(1) A method for producing a pulp sheet by passing pulp slurry through a wire section, a press section and a dryer section and dewatering the pulp slurry,
the pulp slurry contains an ether type nonionic surfactant.
(2) The method for producing a pulp sheet according to the item (1), wherein the nonionic surfactant is a polymer having at least one of a polyoxypropylene chain and a polyoxybutylene chain in a constituent unit thereof.
(3) The method for producing a pulp sheet according to the above (1) or (2), wherein the nonionic surfactant is a copolymer having a polyoxyethylene chain and a polyoxypropylene chain in a structural unit.
(4) The method for producing a pulp sheet according to the item (3), wherein a content of the polyoxypropylene chain in the copolymer is 85% by mass or more.
(5) The method for producing a pulp sheet according to the above (3) or (4), wherein the copolymer is a block copolymer represented by the following formula (I) or (II).
R1O-(C2H4O)a-(C3H6O)b-(C2H4O)c-R2···(I)
(in the formula, R1And R2Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, a + c is 1 to 10, and b is 5 to 40. )
R3O-(C3H6O)d-(C2H4O)e-(C3H6O)f-R4···(II)
(in the formula, R3And R4Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, e represents 1 to 10, and d + f represents 5 to 40. )
(6) The method for producing a pulp sheet according to the above (1) or (2), wherein the nonionic surfactant is a homopolymer of polyoxypropylene.
(7) The method for producing a pulp sheet according to the item (6), wherein the homopolymer of polyoxypropylene is a polymer represented by the following formula (III).
R5O-(C3H6O)g-R6···(III)
(in the formula, R5And R6Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, and g is 5 to 20. )
(8) A dehydration improver for pulp slurry, which comprises an ether-type nonionic surfactant, wherein the ether-type nonionic surfactant is a homopolymer of polyoxypropylene or a copolymer having a polyoxyethylene chain and a polyoxypropylene chain in a structural unit, and the content of the polyoxypropylene chain in the copolymer is 85 mass% or more.
(9) The dewatering improver for pulp slurry according to the item (8), wherein the copolymer is a block copolymer represented by the following formula (I) or (II), or the homopolymer is a homopolymer represented by the following formula (III).
R1O-(C2H4O)a-(C3H6O)b-(C2H4O)c-R2···(I)
(in the formula, R1And R2Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, a + c is 1 to 10, and b is 5 to 40. )
R3O-(C3H6O)d-(C2H4O)e-(C3H6O)f-R4···(II)
(in the formula, R3And R4Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, e represents 1 to 10, and d + f represents 5 to 40. )
R5O-(C3H6O)g-R6···(III)
(in the formula, R5And R6Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, and g is 5 to 20. )
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, there is provided a method for producing a pulp sheet by passing pulp slurry through a wire section, a press section and a drying section and dewatering the pulp slurry, comprising: a method for producing a pulp sheet and a dewatering improver for pulp slurry, which can sufficiently reduce the water content before a drying section.
Drawings
Fig. 1 is a schematic diagram illustrating a manufacturing process of a pulp sheet.
Detailed Description
The method for manufacturing the pulp sheet comprises the following steps: when a pulp sheet is formed from a pulp slurry containing an ether-type nonionic surfactant, the pulp slurry is passed through a wire section, a press section, and a drying section and dewatered.
(nonionic surfactant)
The ether-type nonionic surfactant used in the present invention is obtained by adding ethylene oxide or the like to a raw material having a hydroxyl group such as a higher alcohol or an alkylphenol, and examples thereof include polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, and polyoxypropylene alkyl ether. In addition, polyoxyethylene polyoxypropylene glycol or the like using polypropylene glycol as a hydrophobic group also falls within the range of the ether-type nonionic surfactant.
The ether-type nonionic surfactant used in the present invention is preferably a polymer having at least 1 of a polyoxypropylene chain and a polyoxybutylene chain as a hydrophobic group as a structural unit. Particularly preferred is a copolymer having a polyoxypropylene chain (hereinafter sometimes referred to as "PO") and a polyoxyethylene chain (hereinafter sometimes referred to as "EO") (hereinafter sometimes referred to as "POEO copolymer"), and among these, a copolymer having a PO content of 85 mass% or more is preferred. A homopolymer of propylene oxide (hereinafter sometimes referred to as "PO homopolymer") having a PO content of 100% by mass, that is, consisting of only a polyoxypropylene chain is also a preferable embodiment.
The POEO copolymer may be a random copolymer or a block copolymer, but a block copolymer is preferable in view of fixation to pulp. The POEO copolymer may be used alone in 1 kind, or may be used in combination with 2 or more kinds.
The structure of the terminal is not particularly limited, and may be a hydrogen atom or an alkyl group. Specific examples of the structure include the following structures.
R1O-(C2H4O)a-(C3H6O)b-(C2H4O)c-R2···(I)
(in the formula, R1And R2Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, a + c is 1 to 10, and b is 5 to 40. )
R3O-(C3H6O)d-(C2H4O)e-(C3H6O)f-R4···(II)
(in the formula, R3And R4Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, e represents 1 to 10, and d + f represents 5 to 40. )
R5O-(C3H6O)g-R6···(III)
(in the formula, R5And R6Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, and g is 5 to 20. )
In the above formulae (I) to (III), at least one terminal (R) is preferred2、R4And R6) Is a hydrogen atom, more preferably both terminal (R)1～R6) Is a hydrogen atom. On the other hand, when the terminal is an alkyl group, a single terminal (R) is preferred1、R3And R5) Is alkyl, the other terminal (R)2、R4And R6) Is a hydrogen atom. The number of carbon atoms of the terminal alkyl group is preferably 1 to 28, more preferably 1 to 18.
The average molecular weight is preferably 300 to 3000, more preferably 400 to 2500 in number average molecular weight. The number average molecular weight is a molecular weight calculated by using polystyrene as a standard substance, as measured by GPC (Gel Permeationchromatography).
Preferable examples of the ether-type nonionic surfactant having hydrogen atoms at both ends include triblock copolymers of PO and EO represented by the following formula (I ') or (II '), and PO homopolymers represented by the formula (III ').
HO-(C2H4O)a-(C3H6O)b-(C2H4O)c-H···(I’)
HO-(C3H6O)d-(C2H4O)e-(C3H6O)f-H···(II’)
HO-(C3H6O)g-H···(III’)
In the formula (I'), a + c is 1 to 10, and b is 5 to 40. In the formula (II'), e is 1 to 10 and d + f is 5 to 40. In the formula (III'), g is 1 to 40, preferably 5 to 20.
The POEO block copolymer having the structure represented by the above formula (I') can be obtained, for example, by addition reaction of propylene oxide having hydroxyl groups at both ends and ethylene oxide.
The POEO block copolymer having the structure represented by the above formula (II') can be obtained by, for example, an addition reaction of ethylene oxide having hydroxyl groups at both ends and propylene oxide.
The propylene oxide polymer having the structure represented by the above formula (III') can be obtained, for example, by subjecting propylene oxide to anionic ring-opening polymerization.
(method for producing pulp sheet)
Hereinafter, a method for producing a pulp sheet will be described with reference to fig. 1. Fig. 1 is a schematic view illustrating a method of manufacturing a pulp sheet from pulp slurry. The process comprises the following steps: in the manufacture of pulp slurry, a pulp sheet is manufactured from the pulp slurry. Namely, the method comprises the following steps: a base paper preparation step (pulp slurry production step) 10 and a pulp sheet production step 20.
First, in the base paper preparation step 10, pulp and water are introduced into the pulp storage tank 14 to prepare pulp slurry. Water is supplied from pit 11, and the filtrate recovered in pulp sheet production step 20 described later can be returned to pit 11 and reused (not shown).
Next, in the pulp sheet production step 20, the pulp slurry is formed into a sheet shape (sheet-shaped pulp 30) by the sheet machine 21, and then dewatered in the wire section 22, the press section 23, and the drying section 24 to form a pulp sheet.
< pulp slurry >
The pulp slurry is a liquid obtained by suspending pulp in water, and the concentration of the insoluble suspended matter is usually about 0.2 to 2.0 mass%, preferably 0.5 to 1.5 mass%, more preferably 0.7 to 1.3 mass%.
The surfactant may be added to the pulp slurry in order to store the pulp slurry, a sheet machine 21 described later, a tank 15 for the pulp slurry, and the like, but it is preferable to add the surfactant to the pulp slurry in the pulp storage tank 14 from the viewpoint of easy production.
The amount of the surfactant added is preferably 0.001 to 0.1% by mass, more preferably 0.005 to 0.05% by mass, and particularly preferably 0.01 to 0.02% by mass, based on the insoluble suspended matter contained in the pulp slurry.
Additives generally used in the production of pulp sheets may be added to the pulp slurry within a range not to impair the effects of the present invention, and examples thereof include pH adjusters, preservatives, softeners, antistatic agents, antifoaming agents, and surfactants other than the above surfactants. These additives are usually supplied from the 1 st addition device 60 or the 2 nd addition device 70 in the 1 st grout pipe 61 and the 2 nd grout pipe 71, respectively.
< Net part >
The wire section 22 dewaters the sheet-like pulp 30 formed in the sheet-making machine 21, and is provided with a wire conveyor of a metal mesh type for feeding to the press section 23. The sheet pulp 30 is dewatered by gravity or vacuum dewatering on a wire conveyor.
< press section >
The press section 23 is composed of a felt conveyor, and performs press dewatering by sandwiching the sheet-like pulp 30 between rollers facing each other. In the press dewatering step, if the paper is normally made, it is preferable to use a high pressure to dewater as much as possible before the drying section, but in the present invention, as described above, it is not preferable to dewater by applying a high pressure in view of the requirement of easy debonding and use. Therefore, in the case of normal papermaking, the water content at the exit of the press section is set to 55 to 45% by applying pressure, but in the present invention, the pressure is applied at such a pressure that the water content at the exit of the press section is set to about 60%.
< dry part >
In the drying section 24, the sheet-like pulp is heated and dried. The heating method is not particularly limited, and a hot air dryer, an IR dryer, a drum dryer, or the like can be used. In the present invention, the moisture content of the final pulp sheet is preferably 10 to 25%, more preferably 15 to 20%.
(method of measuring Water content)
Examples of the method of measuring the water content include a method using a dryer, a method of heat drying using infrared rays, and a method using near infrared rays.
The measurement was carried out by a dryer method in accordance with JIS P8202 which tests the absolute dry rate of pulp, and a sample was collected, placed in a constant temperature heating dryer at 105 ℃ and dried, and then returned to room temperature in the dryer, and the moisture content was determined from the weight difference between the sample before and after drying.
The moisture content can be measured quickly by a heat drying method using infrared rays. For example, a sample is put in "Kurigansui" (trade name) manufactured by shiita industries co., and irradiated with infrared rays to measure the water content from the change in mass due to the evaporation of water.
The method using near infrared rays is carried out, for example, using a near infrared moisture meter "KJT-130" (trade name) manufactured by Kett scientific research of K.K.K.. The near infrared ray is light having a wavelength longer than that of visible light and not observed outside red, and sufficiently absorbs moisture, and therefore, the moisture content is measured by measuring the reflectance thereof by irradiating light including the near infrared ray.
Examples
Example 1
Using a slurry of long softwood pulp (NBKP), 0.02 mass% of a surfactant represented by the following formula (a) was added to an insoluble suspension contained in the pulp slurry, and a dynamic water-blocking tester "DDA (dynamic drainage analyzer)" (Ab Akribi Kemikonsulter) was used to obtain sheet-like pulp. The content ratio of the polyoxypropylene chain (PO/(PO + EO), mass ratio) of the surfactant was 0.90.
HO-(C2H4O)a-(C3H6O)b-(C2H4O)c-H···(A)
(a + c and b are 5 and 35, respectively.)
Then, toThe sheet-like pulp was held between a net and a filter paper at a pressure of 3.5kg/cm by a square sheet press No2570 (manufactured by XIONGGUO processor Co., Ltd.) in a pressure dehydration tester2After 10 seconds of pressurization, the water content of the sheet pulp was measured. The results are shown in Table 1. The water content was measured by a method using a dryer. The same applies to examples 2 to 4, comparative example 1 and reference example.
Example 2
Except for using a surfactant represented by the following formula (B) as the surfactant in example 1, sheet-like pulp was obtained in the same manner as in example 1, and the water content of the sheet-like pulp was measured. The results are shown in Table 1.
HO-(C3H6O)g-H···(B)
(g is 7.)
Example 3
Except for using a surfactant represented by the following formula (C) as the surfactant in example 1, sheet-like pulp was obtained in the same manner as in example 1, and the water content of the sheet-like pulp was measured. The results are shown in Table 1. The content ratio of the polyoxypropylene chain (PO/(PO + EO), mass ratio) of the surfactant was 0.89.
HO-(C2H4O)d-(C3H6O)e-(C2H4O)f-H···(C)
(d + f and e are 5 and 30, respectively.)
Example 4
Except for using a surfactant represented by the following formula (D) as the surfactant in example 1, sheet-like pulp was obtained in the same manner as in example 1, and the water content of the sheet-like pulp was measured. The results are shown in Table 1. The content ratio of the polyoxypropylene chain (PO/(PO + EO), mass ratio) of the surfactant was 0.80.
HO-(C2H4O)h-(C3H6O)i-(C2H4O)j-H···(D)
(h + j and i are 10 and 30, respectively.)
Comparative example 1
Except that no surfactant was added in example 1, sheet-like pulp was obtained in the same manner as in example 1, and the water content of the sheet-like pulp was measured. The results are shown in Table 1.
Reference example 1
Except for using a cationic organic polymer ("HighHolder (registered trademark) 821" manufactured by shiita corporation) in example 1, sheet-like pulp was obtained in the same manner as in example 1, and the water content of the sheet-like pulp was measured. The results are shown in Table 1.
In the case of the cationic organic polymer, the anionic portion of the pulp fiber is aggregated by reacting with the cationic group of the polymer. The pulp sheet can be used in a paper machine, but is not used in the production of sheet pulp sold as a raw material because the quality of the pulp is affected. Shown as a reference for the effect.
[ Table 1]
TABLE 1
As shown in Table 1, the use of the nonionic surfactant of the present invention can reduce the water content after pressure dehydration. In particular, examples 1 and 2 having a large PO ratio (hydrophobic portion ratio) also showed superior dewatering performance as compared with the cationic organic polymer used in the paper machine (reference example 1).
Description of attached matter
10 base paper preparation process
11 pits
14 pulp holding tank
15 pool
20 pulp sheet manufacturing process
21 sheet making machine
22 mesh part
23 Press section
24 drying section
30 pieces of paper pulp
31 st flow path pipe
32 nd flow path pipe
60 st addition device
61 st grouting pipe
70 nd 2 nd adding device
71 nd 2 nd grouting pipe.
Claims (9)
1. A method for producing a pulp sheet by dewatering a pulp slurry through a wire section, a press section and a drying section,
the pulp slurry contains an ether type nonionic surfactant.
2. The method for producing a pulp sheet according to claim 1, wherein the nonionic surfactant is a polymer having at least either one of a polyoxypropylene chain and a polyoxybutylene chain in a structural unit.
3. The method for producing a pulp sheet according to claim 1 or 2, wherein the nonionic surfactant is a copolymer having a polyoxyethylene chain and a polyoxypropylene chain in a structural unit.
4. The method for producing a pulp sheet according to claim 3, wherein the content of the polyoxypropylene chain in the copolymer is 85 mass% or more.
5. The method for producing a pulp sheet according to claim 3 or 4, wherein the copolymer is a block copolymer represented by the following formula (I) or (II),
R1O-(C2H4O)a-(C3H6O)b-(C2H4O)c-R2···(I)
in the formula (I), R1And R2Each independently a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, a + c is 1 to 10, b is 5 to 40,
R3O-(C3H6O)d-(C2H4O)e-(C3H6O)f-R4···(II)
in the formula (II), R3And R4Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, e represents 1 to 10, and d + f represents 5 to 40.
6. The method for producing a pulp sheet according to claim 1 or 2, wherein the nonionic surfactant is a homopolymer of polyoxypropylene.
7. The method for producing a pulp sheet according to claim 6, wherein the homopolymer of polyoxypropylene is a polymer represented by the following formula (III),
R5O-(C3H6O)g-R6···(III)
in the formula (III), R5And R6Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, and g is 5 to 20.
8. A dehydration improver for pulp slurry, which comprises an ether-type nonionic surfactant, wherein the ether-type nonionic surfactant is a homopolymer of polyoxypropylene or a copolymer having a polyoxyethylene chain and a polyoxypropylene chain in a structural unit, and the content of the polyoxypropylene chain in the copolymer is 85 mass% or more.
9. The dewatering improver for pulp slurry according to claim 8, wherein the copolymer is a block copolymer represented by the following formula (I) or (II), or the homopolymer is a homopolymer represented by the following formula (III),
R1O-(C2H4O)a-(C3H6O)b-(C2H4O)c-R2···(I)
in the formula (I), R1And R2Each independently a hydrogen atom or an alkyl group having 1 to 28 carbon atoms,a + c is 1 to 10, b is 5 to 40,
R3O-(C3H6O)d-(C2H4O)e-(C3H6O)f-R4···(II)
in the formula (II), R3And R4Each independently a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, e is 1 to 10, d + f is 5 to 40,
R5O-(C3H6O)g-R6···(III)
in the formula (III), R5And R6Each independently represents a hydrogen atom or an alkyl group having 1 to 28 carbon atoms, and g is 5 to 20.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019218679A JP6908097B2 (en) | 2019-12-03 | 2019-12-03 | Pulp sheet manufacturing method and dehydration improver for pulp slurries |
| JP2019-218679 | 2019-12-03 | ||
| PCT/JP2020/034414 WO2021111698A1 (en) | 2019-12-03 | 2020-09-11 | Method for producing pulp sheet, and dehydration improver for pulp slurry |
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| CN114402107A true CN114402107A (en) | 2022-04-26 |
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| JP (1) | JP6908097B2 (en) |
| KR (1) | KR102628687B1 (en) |
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| US6706144B1 (en) * | 2002-06-18 | 2004-03-16 | Ondeo Nalco Company | Method of dewatering pulp |
| JP2005314836A (en) * | 2004-04-28 | 2005-11-10 | Kao Corp | Method for producing pulp sheet |
| WO2009107645A1 (en) * | 2008-02-27 | 2009-09-03 | 栗田工業株式会社 | Pulp washing agent and process for production of pulp |
| CN101939481A (en) * | 2008-01-22 | 2011-01-05 | 狮王株式会社 | Detergent for kraft pulp and process for producing kraft pulp with the same |
| JP2011026713A (en) * | 2009-07-21 | 2011-02-10 | Lion Corp | Detergent for kraft pulp and method for producing kraft pulp using the same |
| JP2016528399A (en) * | 2013-07-10 | 2016-09-15 | エコラブ ユーエスエイ インク | Promotion of sheet dehydration using soy flour or soy protein |
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| JPS6440691A (en) * | 1987-08-07 | 1989-02-10 | Katayama Chemical Works Co | Water separating promoter of water-containing pulp |
| JPH01306693A (en) * | 1988-05-30 | 1989-12-11 | Hakutou Kagaku Kk | Agent and method for accelerating dehydration of pulp slurry |
| ES2231875T3 (en) * | 1996-07-18 | 2005-05-16 | Kao Corporation | PROMOTING AGENTS FOR PAPER VOLUME. |
| KR20020048058A (en) * | 2000-12-15 | 2002-06-22 | 서평원 | The recycling method of original pulp from used milk carton using surfactants |
| JP2003105685A (en) * | 2001-09-28 | 2003-04-09 | Kao Corp | Method for producing pulp sheet |
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2019
- 2019-12-03 JP JP2019218679A patent/JP6908097B2/en active Active
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- 2020-09-11 KR KR1020227008200A patent/KR102628687B1/en active IP Right Grant
- 2020-09-11 CN CN202080064666.7A patent/CN114402107B/en active Active
- 2020-09-11 WO PCT/JP2020/034414 patent/WO2021111698A1/en active Application Filing
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|---|---|---|---|---|
| JPS5528971A (en) * | 1978-08-24 | 1980-02-29 | Sanyo Chem Ind Ltd | Foaming agent for foaming and spraying agricultural chemical |
| JPH11217784A (en) * | 1998-01-30 | 1999-08-10 | Asahi Denka Kogyo Kk | Deinking agent |
| US6706144B1 (en) * | 2002-06-18 | 2004-03-16 | Ondeo Nalco Company | Method of dewatering pulp |
| JP2005530054A (en) * | 2002-06-18 | 2005-10-06 | ナルコ カンパニー | Pulp dewatering method |
| JP2005314836A (en) * | 2004-04-28 | 2005-11-10 | Kao Corp | Method for producing pulp sheet |
| CN101939481A (en) * | 2008-01-22 | 2011-01-05 | 狮王株式会社 | Detergent for kraft pulp and process for producing kraft pulp with the same |
| WO2009107645A1 (en) * | 2008-02-27 | 2009-09-03 | 栗田工業株式会社 | Pulp washing agent and process for production of pulp |
| JP2011026713A (en) * | 2009-07-21 | 2011-02-10 | Lion Corp | Detergent for kraft pulp and method for producing kraft pulp using the same |
| JP2016528399A (en) * | 2013-07-10 | 2016-09-15 | エコラブ ユーエスエイ インク | Promotion of sheet dehydration using soy flour or soy protein |
Also Published As
| Publication number | Publication date |
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| WO2021111698A1 (en) | 2021-06-10 |
| KR20220103091A (en) | 2022-07-21 |
| CN114402107B (en) | 2024-02-02 |
| JP6908097B2 (en) | 2021-07-21 |
| JP2021088781A (en) | 2021-06-10 |
| KR102628687B1 (en) | 2024-01-23 |
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