JP2002327385A - Deinking agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deinking agent having both functions as the deinking agent and functions to remove a pressure-sensitive adhesive at the same time when a sheet of recycled paper is obtained from a sheet of waste paper containing the pressure-sensitive adhesive material such as an adhesive. SOLUTION: This deinking agent comprises one or more kinds selected from alkylene oxide adduct compounds of a higher alcohol, alkylene oxide adduct compounds of a fatty acid, alkylene oxide adduct compounds of a dimer acid or a mixture of the dimer acid with an alcohol, alkylene oxide adduct compounds of a mixture of a natural oil and fat with a polyhydric alcohol and fatty acids or salts thereof together with a compound prepared by adding an alkylene oxide to an alkylamine compound and used in a deinking step of the sheet of waste paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Used newspapers, used magazines, and O2 containing adhesives and adhesives such as adhesive foreign substances collected from home and abroad.
The present invention relates to a deinking agent used in a step of performing deinking treatment by a flotation method, a cleaning method, or a compromise method thereof when a recycled paper is obtained by recycling a waste paper A, a colored waste paper or the like.

[0002]

2. Description of the Related Art Recycling of used paper is performed by removing ink from raw material used paper by deinking treatment, obtaining recycled pulp, and manufacturing recycled paper. There, in addition to conventional fatty acid-based deinking agents, alkylamine-based deinking agents and higher alcohol-based nonionic deinking agents have been developed. Alkylamine-based deinking agents include compounds having a block arrangement in which ethylene oxide is added to a primary amine (JP-A-63-233).
No. 20) or a compound having a random arrangement in which ethylene oxide and propylene oxide are added (Japanese Patent Laid-Open No. 57-254).
No. 89). However, although these compounds alone were excellent in deinking performance, the performance of removing the adhesive was insufficient due to poor cohesiveness of the adhesive particles.

On the other hand, used newspapers collected from Japan and overseas,
Magazine used paper, OA used paper, colored used paper, and the like sometimes include adhesives such as magazine backs and adhesives, and removal of the adhesives is a major technical problem. However, the known fatty acid-based, alkylamine-based, and higher alcohol-based nonionic deinking agents described above do not have satisfactory adhesive removal performance. As a method for removing these sticky substances, for example, a method using a screen or a cleaner (JP-A-06-065882) is known. However, in this method, a step of removing the sticky substance is required separately from the deinking step, and improvement is desired from the viewpoint of equipment and workability.
In addition, the adhesive that can be removed in response to equipment is a relatively large dust-like adhesive, and the colloidal adhesive that causes the paper breakage or re-agglomeration caused by the papermaking process, such as sumi-e, is almost completely eliminated. Cannot be removed.

[0004]

SUMMARY OF THE INVENTION The present invention has both a function as a deinking agent and a function as a de-adhesive material when obtaining recycled paper from waste paper containing an adhesive such as a back of a magazine or an adhesive substance. The purpose is to provide drugs.

[0005]

That is, the present invention provides a deinking agent containing a compound (a) obtained by adding an alkylene oxide to a compound represented by the general formula (1) and / or (2). A deinking agent used in the deinking step of used paper together with at least one compound (b) selected from (b-1) and (b-2), R ¹ -NH ₂ (1) R ^2- NH-R ³ (2) (wherein R ¹ and R ² are an alkyl group, alkenyl group or aryl group having 6 to 22 carbon atoms, and R ³ is an alkyl group, alkenyl group or aryl group having 1 to 22 carbon atoms) (B-1) an alkylene oxide adduct of a higher alcohol, an alkylene oxide adduct of a fatty acid, an alkylene oxide adduct of a dimer acid or a mixture of a dimer acid and an alcohol, and a mixture of a natural oil and a polyhydric alcohol. Alkylene oxide adduct of the compound (b-
2) The present invention relates to a deinking method in which at least one of a fatty acid or a salt thereof, and each of compound (a) and compound (b) is added to a deinking step.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The deinking agent of the present invention is used in a step of deinking treatment by a flotation method, a cleaning method or a compromise method thereof. In particular, ink is attached to air bubbles and discharged together with foams. In the flotation method, it has good deinking performance and ability to remove sticky substances such as adhesives.

The compound (a) contained in the deinking agent of the present invention is a compound obtained by adding an alkylene oxide to the compound represented by the general formula (1) and / or (2).

[0008] In the general formula (1) and / or (2) a compound represented by, R ^1, R ² and R ³ is a linear or branched alkyl group, an alkenyl group, an aryl group, R ¹ and R ² has a carbon number of 6 or more from the viewpoint of ink releasability, and 22 or less from the viewpoint of foam breaking properties of the foam after flotation;
R ³ has a carbon number of 1 or more from the viewpoint of ink collection, and 22 or less from the viewpoint of foam breaking after flotation. Further, R ¹ , R ² and R ³ preferably have 8 to 20 carbon atoms, and particularly preferably 12 to 20 carbon atoms from the viewpoint of ink releasability.

Specific examples of the general formula (1) include hexylamine, octylamine, nonaamine, decaamine,
Undecaamine, dodecaamine, tetradecaamine, hexadecaamine, octadecamine, eicosiamine,
Docosylamine, 2-ethylhexylamine and the like. Specific examples of the general formula (2) include dihexylamine, dioctylamine, dinonamine, dideamine, diundecamine, didodecaamine, ditetradecamine, dihexadecamine, dioctadecamine, dieicosylamine, didocosylamine, Examples include ethylhexylamine, monomethyloctylamine, and monoethylhexylamine.

When an alkylene oxide is added to an amine, a compound having two alkylene oxide chains of the same type is obtained in the case of the general formula (1), and a compound having one alkylene oxide chain in the case of the general formula (2). A compound is obtained. The average addition mole number of alkylene oxide refers to the average addition mole number of alkylene oxide per active hydrogen.

As the alkylene oxide, ethylene oxide, propylene oxide and butylene oxide are used. The average number of added moles (m) of alkylene oxide per active hydrogen is preferably 5 or more and 200 or less from the viewpoint of ink-collecting property. In the case of the general formula (1), it is particularly preferably 5 or more and 100 or less. In the case of (2), 5 to 150 is particularly preferable. Further, from the viewpoint of foaming property in flotation, it is preferable that the alkylene oxide chain per active hydrogen has ethylene oxide. The average number of moles of ethylene oxide added per active hydrogen (n) is preferably 2 or more and 100 or less, and particularly preferably 2 or more and 50 or less, from the viewpoint of the performance of removing sticky substances. The average number of added moles (p) of propylene oxide is preferably 0 or more and 100 or less, particularly preferably 0 or more and 50 or less, from the viewpoint of the performance of removing sticky substances. The average number of added moles (q) of butylene oxide is preferably from 0 to 100, particularly preferably from 0 to 50.

The ratio (n / m) of the average addition mole number of ethylene oxide in the alkylene oxide chain per active hydrogen is preferably 0.4 or more and 1 or less from the viewpoint of foaming property by flotation. 0.8 or more and 1 or less are particularly preferable.

The form of addition of the alkylene oxide is preferably ethylene oxide alone or random addition of ethylene oxide and propylene oxide or ethylene oxide and butylene oxide from the viewpoint of the ability to remove sticky substances.

The compound (a) of the present invention can be produced by a conventional alkylene oxide addition polymerization reaction. For example, a predetermined amount of an alkylene oxide (a mixture in a predetermined ratio in the case of random) to be added to the compound of the general formula (1) and / or (2) is subjected to an addition reaction in a nitrogen atmosphere using an autoclave. At this time, an alkali substance is added as a catalyst as needed. The compound (a) in the deinking agent of the present invention is preferably contained at 100% by weight in the deinking agent. However, from the viewpoint of matching to various individual deinking systems on the market, a foaming agent, a defoaming agent, A foaming agent, a viscosity reducing agent and the like can be contained. Even in such a case, the compound (a) is preferably contained in an amount of 60% by weight or more, particularly preferably 80% by weight or more.
For example, examples of foaming agents include alkylbenzene sulfonates and higher alcohol sulfates, and examples of antifoaming agents include oleic acid, silicone oil, and mineral oil. Glycol and butyl cellosolve.

The deinking agent of the present invention comprises a compound (b-1), an alkylene oxide adduct of a higher alcohol (preferably having 8 to 20 carbon atoms) and a fatty acid (having 8 to 2 carbon atoms).
0 is preferred), a dimer acid or a dimer acid and an alcohol (having 16 to 4 carbon atoms).
0), and an alkylene oxide adduct of a mixture of natural fats and oils (preferably having 20 to 50 carbon atoms) and polyhydric alcohols (preferably having 2 to 6 carbon atoms, and preferably having 2 to 6 carbon atoms). Fatty acid (C8), which is an addition compound and compound (b-2)
To 20) or a salt thereof (preferably sodium), together with at least one compound (b) selected from the waste paper deinking step. The average addition mole number of the alkylene oxide (b-1) is preferably from 6 to 500, particularly preferably from 10 to 400. Regarding the method of adding the deinking agent containing the compound (a) and the compound (b), the two may be mixed in advance or added separately. Compound (b) may be added as a deinking composition containing a solvent and other additives.

The total amount of the compound (a) and the compound (b) is preferably from 0.01 to 1 part by weight based on 100 parts by weight of waste paper. The content is particularly preferably from 01 part by weight to 0.5 part by weight. The amount of the compound (a) added to the deinking process of the used paper is 0.03 or more in terms of weight ratio with respect to the total amount of the compound (a) and the compound (b) added, from the viewpoints of ink releasability and removal of adhesive. 0.6 or less, preferably 0.03 or more.
It is more preferably 5 or less, particularly preferably 0.05 or more and 0.4 or less.

The deinking agent of the present invention can be used in a lump or in a divided manner in the ink removing step, the ink removing step, and the pulp washing step. The deinking agent and the compound (b) of the present invention may be made into one liquid or added separately, but it is preferable to mix and make one liquid, from the viewpoint of operability. Specifically, it can be added before or during an ink removing step using a pulper, a kneader, a chemical mixer or the like, an ink removing step using a flotator, etc., or a washing step using a thickener, a washer or an extract. In particular, the deinking agent of the present invention is preferably present in the pulp slurry to perform flotation, and it is preferable to add the deinking agent of the present invention in the step of removing the ink of the flotator or a step prior thereto. Other steps can be performed according to a conventionally known deinking method, and each step can be performed a plurality of times. The adhesive can be removed together with the ink in the ink removing step by the deinking agent of the present invention without providing a step for removing the adhesive in addition to the conventionally known deinking step.

The deinking agent of the present invention includes known alkaline agents such as caustic soda and sodium silicate, bleaching agents such as hydrogen peroxide, hypochlorite and hyposulfite, alkylbenzene sulfonates, higher alcohol sulfates. A foaming agent such as a salt, an antifoaming agent such as oleic acid, silicone oil and mineral oil, a pitch control agent, and a sequestering agent such as EDTA and DTPA can also be used in combination.

The waste paper from which the sticky substance is to be removed according to the present invention is not particularly limited, but is used in the market, including newspapers, magazines, OA waste paper or colored waste paper, tack paper, pressure-bonded postcards containing adhesive substances such as adhesives. Further, application to a mixture of various kinds of used paper is suitable.

The mechanism for removing the sticky substance of the deinking agent of the present invention is as follows. The nitrogen portion of the alkylamine in the compound (a) peels off the sticky substance together with the ink, and the compound (a) and the compound (b) It is considered that the alkylene oxide chain and the carboxyl group are adsorbed on the sticky substance and prevent the sticky substance from re-adhering to the pulp fiber. After that, the adhesive substance becomes ink particles, ash particles,
Alternatively, a certain particle size (10 μ
m). Then, in an ink removing step such as flotation, these particles together with the foam are discharged from the pulp slurry together with the ink as floss. In addition, selection of the alkylene oxide to be added is as follows.
Necessary to promote the interaction between the deinking agent and the slime and the deinking agent with the pulp fibers. The oxyethylene group gives hydrophilicity, and the oxypropylene group and oxybutylene group give hydrophobicity. It is considered that an appropriate balance of hydrophilicity / hydrophobicity obtained by combining these gives good adhesion removal properties.

[0021]

EXAMPLES Examples 1, 3, 5, and 7 to 18 The deinking treatment and the performance evaluation were performed by the following methods.

[Deinking treatment] Waste paper raw material (newspaper / flyer /
Magazine / tack paper weight ratio = 5/2 / 2.5 / 0.5) 10
0 parts by weight (absolute dry weight) was placed in a table top disintegrator, and 0.5 parts by weight of caustic soda, compound (a) and compound (b) shown in Table 3
Was added in advance in an addition ratio shown in Table 3 so as to be 0.3 parts by weight in total, and further, 200 ° C. of industrial hot water 200 ° C. was added.
0 parts by weight was added, and defibration was performed at 3000 rpm for 10 minutes. Then, the pulp concentration was reduced to 15% using an 80-mesh stainless steel wire, followed by sodium hydroxide,
No. 3 sodium silicate and hydrogen peroxide were added in an amount of 0.5 parts by weight, 1.5 parts by weight, and 0.5 parts by weight, respectively.
Bleaching was performed for a minute. Thereafter, the pulp concentration was diluted to 5% with warm industrial water at 40 ° C., and defibrated at 3000 rpm for 1 minute to obtain a pulp slurry. Subsequently, it was diluted to a pulp concentration of 1% with warm industrial water at 40 ° C. 300 g of the slurry before being charged into the flotator was sampled and used as a sample before removing the sticky substance (sample A). Meanwhile, put the pulp slurry diluent 4500Cm ³ lab flotation cell volume 5000 cm ^3, diluent 1.50 per liter
Flotation was performed for 6 minutes at an air supply rate of 1 liter per minute. During that time, an operation of removing the foam containing the ink and the sticky substance accumulated on the flotation cell every minute was performed. A pulp slurry (pulp concentration: about 1%, 300 g) immediately after the floatator treatment was collected and used as a sample (sample B) for evaluating the amount of sticky substances. Thereafter, the pulp slurry was concentrated to a pulp concentration of 13%, diluted again with industrial water to 1%, and diluted with industrial water to 150% in accordance with JIS P8209-1994.
A handsheet having a basis weight of 150 g / m ² was prepared using a mesh wire and used as Sample 1. The slurry 25.4 concentrated to a pulp concentration of 13% after the flotation treatment.
g was diluted with 200 times the amount of industrial water, and the pulp concentration was adjusted to 1
The operation of concentrating to 3% was repeated four times, and a sheet having a basis weight of 150 g / m ² was prepared by the same operation as above, to obtain Sample 2.

[Evaluation of Performance] In the above deinking method, the following evaluations (1) to (3) were performed. Table 3 shows the results.

(1) Whiteness The whiteness of Sample 1 was measured in accordance with JIS P8123-1961.

(2) Unstripped ink area ratio The ink area on the surface of Sample 2 was measured at a magnification of 20 times with an image analyzer (Lizex F, manufactured by Nireco Co.) and calculated by the following equation. Unstripped ink area ratio (%) = (S / F ) × 100 S; 100 field ink area measured during (mm ²⁾ F; 100 field total area 15000 ² (1 viewing area 150 mm ²⁾ of the.

(3) Adhesive removal rate Samples A and B were treated at 105 ° C. under reduced pressure of 60 mmHg for 48 hours.
Leave for a time to obtain a dried product. Next, 2 g was accurately weighed and subjected to Soxhlet extraction using 1,2-dichloroethane for 8 hours, and the sticky substance removal rate was calculated from the weight of the extracted sticky substance by the following formula. Adhesive substance removal rate = 100 × {(1- (extracted weight of sample B dried matter / extracted weight of sample A dried matter)}}.

Tables 1 and 2 show the criteria for the performance evaluation. Generally, (1) whiteness and (2) unstripped ink area ratio are both important indicators for the quality of paper products, but the evaluation values of deinking properties are (1) whiteness and (2) The lower evaluation value of the release ink area ratio was adopted.

Examples 2, 4, 6 Examples 1, 3, and 6 were repeated except that Compound (a) and Compound (b) were separately added at a ratio shown in Table 3 so as to be 0.3 parts by weight in total. The deinking process and the performance evaluation were performed in the same manner as in 5, 7 to 18.

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

[Table 3]

Comparative Examples 1 to 7 Using the compounds shown in Table 4, deinking treatment and performance evaluation were performed in the same manner as in Examples 1, 3, 5, and 7 to 18.

[0033]

[Table 4]

[0034]

The deinking agent of the present invention is obtained by adding alkylene oxide to a mixture of a higher alcohol, a fatty acid, a dimer acid or a natural oil or fat and a polyhydric alcohol when obtaining recycled paper from waste paper containing an adhesive such as an adhesive. By using in combination with the added compound and at least one compound selected from fatty acids or salts thereof, sticky substances can be efficiently removed from waste paper.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C11D 17/00 C11D 17/00 D21H 17/07 D21H 17/07 (72) Inventor Koji Hamaguchi Wakayama-shi, Wakayama Minato 1334 Kao Corporation Research Institute (72) Inventor Yuichi Iratsuka 1334 Minato 1 Wakayama City Wakayama Prefecture Minato 1334 Kao Corporation Research Institute F-term (reference) AA11 AC09 AE05 AE09 AG35 BA37 EA30 EA32 FA30 GA35

Claims (5)

[Claims] 1. A deinking agent containing a compound (a) obtained by adding an alkylene oxide to a compound represented by the general formula (1) and / or (2), wherein (b-1) and (b) -2) A deinking agent used in the deinking step of used paper together with at least one compound (b) selected from the group consisting of: R ¹ —NH ₂ (1) R ² —NH—R ³ (2) (wherein R ¹ and R ² are an alkyl group, alkenyl group or aryl group having 6 to 22 carbon atoms, and R ³ is a carbon atom (B-1) alkylene oxide addition compound of higher alcohol, alkylene oxide addition compound of fatty acid, alkylene oxide addition of dimer acid or a mixture of dimer acid and alcohol Compounds, alkylene oxide adducts of mixtures of natural fats and oils and polyhydric alcohols (b-2) Fatty acids or salts thereof 2. The compound (a) represented by the general formula (1) and / or (2) wherein the average number of moles of alkylene oxide added per active hydrogen (m) and the average mole of ethylene oxide added per active hydrogen. The deinking agent according to claim 1, wherein the number (n) satisfies the formulas (3) to (5). 5 ≦ m ≦ 200 (3) 2 ≦ n ≦ 100 (4) 0.4 ≦ n / m ≦ 1 (5) 3. A deinking agent containing the compound (a) and the compound (b). 4. A deinking method comprising adding at least one of said compound (a) and said compound (b) to a waste paper deinking step. 5. The deinking method according to claim 4, wherein the amounts of the compound (a) and the compound (b) satisfy formulas (6) and (7) with respect to 100 parts by weight of waste paper. 0.01 parts by weight ≦ {total weight parts of compound (a) and compound (b) added} ≦ 1 part by weight (6) 0.03 ≦ {addition amount of compound (a)} / {compound The sum of the addition amounts of (a) and compound (b)｝ ≦ 0.6 (7)