JPH08120582A - Deinking agent for recycling waste paper - Google Patents

Abstract

PURPOSE: To obtain a deinking agent capable of giving high-quality regenerated pulp of high whiteness with low residual ink, depositing no fatty acid crystal at normal temperatures, also not causing its separation/solidification or crystal deposition due to temperature variation. CONSTITUTION: This deinking agent for recycling waste paper consists of a liquid composition prepared by dissolving (A) a crystallization inhibitor, pref. a polyhydric alcohol fatty acid ester and (B) a fatty acid mixture, pref. 8-24C (esp. 12-18C) saturated fatty acids in (C) a nonionic surfactant. The amounts of the respective components to be used are as follows: A: 0.05-20wt.% based on the total amount of B and C, and the weight ratio B/C of (5:95) to (40:60). The polyhydric alcohol in the component A exemplified is e.g. (di)glycerol, a 9-90C polyglycerol, sucrose, sorbitan, sorbitol, and the fatty acid in the component A is e.g. a 12-22C saturated fatty acid, or a 16-12C unsaturated fatty acid. The component C is e.g. an adduct of a 2-4C alkylene oxide to an active hydrogen-bearing alcohol, amide or fatty acid, or a fatty acid esterified product thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deinking agent used for recycling used paper such as newspapers and magazines. More specifically, the present invention relates to a deinking agent capable of obtaining a high-quality recycled pulp having a high whiteness and a low residual ink when performing deinking treatment by a flotation method and a flotation / wash combination system for newspapers, magazines and the like.

[0002]

2. Description of the Related Art Recycling newspapers, magazines, etc. has been carried out for a long time, but recently, it is effective from the viewpoints of lack of pulp resources and soaring prices thereof, as well as measures against garbage and protection of forest resources. Utilization is becoming increasingly important. Accelerating the development of advanced technology for deinking pulp to meet the growing needs. On the other hand, recent waste paper has become more difficult in terms of deinking due to changes in printing technology, printing method and printing ink components.

Therefore, in order to further promote the deinking effect, improvements have been made to the apparatus. Examples thereof include high-concentration aging treatment by installing a tower, introduction of a disperser and a kneader for further promoting ink separation by physical force, and installation of a high-concentration pulper. Therefore, the peeled ink becomes finer, and there is a need for a deinking agent having a stronger ink collecting property. Also in the flotator, the introduction of a high bubble type flotator having an improved ink removal efficiency is becoming popular, and therefore, there is a need for a deinking agent having a high defoaming property in terms of operability.

Chemicals used for separating and removing ink and other impurities from waste paper include alkaline agents such as caustic soda, sodium silicate, sodium carbonate and sodium phosphate,
Bleaching agents such as hydrogen peroxide, hyposulfite, hypochlorite, E
A deinking agent is used together with a sequestering agent such as DTA or DTPA.

Conventionally, the deinking agent is an anion activator such as alkylbenzene sulfonate, higher alcohol sulfate ester salt, α-olefin sulfonate, dialkylsulfosuccinate, etc., higher alcohol, alkylphenol and ethylene oxide adduct of fatty acid. , Alkanol amides and other nonionic activators have been used alone or in combination of two or more.

However, in response to the above-mentioned changes in the deinking environment, the strongest fatty acid soap or fatty acid (which becomes soap by the alkaline agent in the system) is being reconsidered as an ink collector. .

[0007]

As a technique using a fatty acid soap or a fatty acid, a saturated fatty acid soap or a saturated fatty acid which is the strongest as an ink collecting agent and has a good defoaming property (becomes soap by an alkaline agent in the system) And the combination of an ink release agent or a foaming agent are disclosed in JP-A-50-142804 and JP-A-
61-186592, disclosed in JP-A-62-250291,
The use of alkylene oxide adducts of fatty acids and alcohols in combination or with a compounded composition improves the ink releasability and the ink collection performance, and is purported to improve the quality of recycled pulp.

However, these techniques have no description of the form of the compound, and the fatty acids are precipitated and separated at room temperature simply by mixing the saturated fatty acids such as solid stearic acid actually used in the market. Also, in the case of combined addition,
Saturated fatty acids are solid at room temperature, so they have poor operability, and when actually used, heating equipment at 50 ° C or higher or special addition equipment such as soap manufacturing equipment is required, which consumes a lot of energy and has poor operability. Since the fatty acid and the fatty acid are not uniformly mixed in the deinking system and remain in the form of a lump, they remain on the recycled paper as a product or the deinking quality is deteriorated.

Further, JP-A-57-210093 and JP-A-63-5059
No. 0, JP-A-63-196789, JP-A-1-97289, JP-A-5-501286 and the like, the fatty acid is used in combination with a nonionic surfactant or an anionic surfactant. It is known that the O / W emulsion improves the above-mentioned drawbacks. However, these solutions have not been able to sufficiently solve the drawbacks of saturated fatty acids, and have problems in stability and recoverability due to temperature changes of emulsions. In addition, there is a problem that the transportation cost of the product is increased because the manufacturing equipment has an emulsification facility and the concentration of the active ingredient is low.

[0010]

The present inventors have improved the operability by making the product form liquid without impairing the excellent ink collecting properties, ink releasability, and foam breakability which are the characteristics of saturated fatty acids. Moreover, as a result of intensive research aimed at obtaining a deinking agent that improves the deinking quality of recycled pulp, a liquid obtained by dissolving a crystallization inhibitor and a fatty acid mixture in a nonionic surfactant. The inventors have found that the composition can achieve this object and completed the present invention.

That is, the present invention relates to (a) a crystallization inhibitor and
It is intended to provide a deinking agent for recycling used paper, comprising a liquid composition obtained by dissolving (b) a fatty acid mixture in (c) a nonionic surfactant.

In the present invention, the "crystallization inhibitor" means
(b) Solubilizing the fatty acid mixture of the component in the nonionic surfactant, or suppressing the crystallization of the fatty acid in the fatty acid mixture in the nonionic surfactant, or forming fine crystals as fine crystals. It refers to something that works to suppress growth.

The deinking agent for recycling used paper according to the present invention is as described above.
(a) ~ (c) is a liquid composition containing the components,
It is particularly preferable that the dissolved fatty acid is not precipitated and solidified and is in a fluid state. In addition, even if the fatty acid is dispersed in the nonionic surfactant as very fine particles, it can be used as long as it has good stability and fluidity and does not adversely affect the deinking process. .

The crystallization inhibitor of the present invention has an action of inhibiting crystallization in a nonionic surfactant as described above, and an ester of a polyhydric alcohol and a fatty acid is preferable.
Examples of the polyhydric alcohol include ethylene glycol, propylene glycol, glycerin, polyglycerin, sorbitol, sorbitan, sucrose and the like. Further, as the fatty acid, saturated fatty acid having 12 to 22 carbon atoms, 16 to 16 carbon atoms
There are 22 unsaturated fatty acids and mixtures thereof in any proportion. Among fatty acids, saturated fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid,
Examples include behenic acid. Examples of unsaturated fatty acids include palmitoleic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, erucic acid and ricinoleic acid.

In particular, the polyhydric alcohol moiety constituting the polyhydric alcohol fatty acid ester is a polyglycerin (having 9 to 9 carbon atoms) having an average degree of polymerization of 2 to 10 and preferably 4 to 10 calculated from glycerin, diglycerin or a hydroxyl value. 90 polyglycerin) is preferred. Further, the fatty acid constituting the polyhydric alcohol fatty acid ester is a saturated or (poly) unsaturated fatty acid having a total carbon number of 10 to 24, and it is preferable to use a mixed fatty acid rather than a single fatty acid. More preferably, it is a mixture of unsaturated fatty acids such as oleic acid and linoleic acid with saturated fatty acids essentially containing palmitic acid and stearic acid.

The degree of esterification of the polyhydric alcohol fatty acid ester is 30 to 100%, preferably 60 to 100%.

In the present invention, a fatty acid mixture is used as the component (b), but saturated fatty acids having an ink collecting action and a defoaming action are used. Among them, the total carbon number is 8 to 24, and particularly the total carbon number is 12 to 18. The saturated fatty acid is preferable, and specific examples thereof include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid and the like. Especially carbon number 14-18
It is preferable to use a fatty acid mixture that essentially contains the saturated fatty acid.

The fatty acid mixture of the present invention has a titer (melting point; JIS K-0065) in the range of 10 to 50 ° C., preferably 20.
It should be in the range of ~ 45 ℃. An unsaturated fatty acid, polymerized fatty acid, or resin acid may be contained as long as it is within this titer range.

In the present invention, as the nonionic surfactant, those having an ink peeling action and recognized as a deinking agent are used. The above-mentioned crystallization inhibitor of component (a) is also a kind of nonionic surfactant, but these do not have an ink peeling action and are not normally used as deinking agents. Distinguished from active surfactants. As the nonionic surfactant, alcohols, amides or fatty acids having active hydrogen have 2 to 2 carbon atoms.
Compounds obtained by random addition or block addition of alkylene oxide of 4 or fatty acid esterified products thereof are preferable. Specific examples include the following.

(1) Alkylene oxide adduct of saturated or unsaturated primary or secondary alcohol having 8 to 24 carbon atoms or alkylene oxide adduct of alkylphenol having 8 to 12 carbon atoms Myristyl alcohol and stearyl alcohol are preferred. Examples of the alkylene oxide added to alcohol (hereinafter abbreviated as AO) include ethylene oxide (hereinafter abbreviated as EO), propylene oxide (hereinafter abbreviated as PO), and butylene oxide, and particularly EO is essential. It is desirable to do. The number of moles of AO added is preferably 3 to 200 moles, particularly 10 to 80 moles per mole of alcohol or alkylphenol. In this range, a nonionic surfactant having particularly good ink releasability and easy liquefaction can be obtained. To be The addition form may be either random addition or block addition.

(2) AO Adduct of Saturated or Unsaturated Higher Fatty Acid with Total Carbon Number of 10-24 As such higher fatty acid, saturated fatty acid is lauric acid,
Examples include myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid and the like. Examples of unsaturated fatty acids include palmitoleic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, erucic acid and ricinoleic acid. The type of AO and the number of moles added are the same as above.

(3) AO adduct of saturated or unsaturated primary or secondary amine having a total carbon number of 8 to 36 Such amines include 2-ethylhexylamine, di-2-ethylhexylamine, laurylamine and diamine. Laurylamine, tetradecylamine, ditetradecylamine, hexadecylamine, dihexadecylamine, stearylamine, distearylamine, oleylamine,
Examples include dioleylamine. The type of AO and the number of moles added are the same as above.

(4) AO adduct of a mixture of a fat or oil consisting of an ester of saturated or unsaturated fatty acid having 8 to 24 carbon atoms and glycerin and a polyhydric alcohol having a valence of 2 to 10 As the fatty acid, the above (2) Examples of the above are given.
Examples of the 2- to 10-valent polyhydric alcohol include ethylene glycol, propylene glycol, glycerin, polyglycerin, sorbitol, sorbitan, sucrose and the like. The type of AO and the number of moles added are the same as above.

Other than these nonionic surfactants, any one having suitable properties as a deinking agent can be used.
Non-ionic surfactants are by Davies
The HLB is preferably in the range of 2 to 12, particularly 3 to 10.

In the present invention, the preferable ratio of the above-mentioned (b) fatty acid mixture to (c) nonionic activator is (b) in a weight ratio.
/ (C) = 5/95 to 40/60, preferably 10/90 to 30/70. If the fatty acid mixture exceeds this range, the product form solidifies and separates, making it difficult to liquefy, and the ink releasability tends to decrease. If the amount of the fatty acid mixture is less than this range, the ink collecting property and the defoaming property will be deteriorated.

Further, when preparing a liquid composition which is a deinking agent for recycling used paper according to the present invention, the addition of water can promote the dissolution of fatty acids. However, if the amount of water is too large, the liquid composition may thicken or solidify, so the amount of water needs to be 40% by weight or less in the liquid composition, preferably 5 to 20% by weight. %.

The deinking agent for recycling used paper of the present invention comprises a liquid composition in which the above-mentioned components (a) and (b) are dissolved in the component (c), and the production method thereof is not limited, A general method is to charge each component in a lump and once heat the mixture to a temperature higher than the melting point of the fatty acid mixture of component (b) to mix them, sufficiently dissolve the fatty acids, and then cool to around room temperature. The deinking agent of the present invention does not precipitate fatty acid crystals at room temperature, and does not cause separation / solidification or crystal precipitation due to temperature change.

The liquid composition used as the deinking agent of the present invention desirably has a liquefaction index of 0.8 to 1.2, preferably 0.9 to 1.1. Here, the "liquefaction index" is calculated by the following method. First, a liquid composition in which a crystallization inhibitor and a fatty acid mixture are dissolved in a nonionic surfactant is prepared, placed in a suitable cylindrical container and allowed to stand at room temperature for a certain period of time,
The upper 1/10 (volume basis) solution and the lower 1/10 (volume basis) solution are sampled and the acid value (JIS K-3504) of each is measured. From that value, [acid value at the top] / [acid value at the bottom]
Is calculated and used as the liquefaction index. The closer the liquefaction index is to 1, the more uniform the solution (in some cases, the dispersed state) is.

The deinking agent for recycling used paper of the present invention may be any one of the used paper disintegration step, the kneader treatment step, the aging tower step and the flotation treatment step, or may be added separately to each step. It is most effective when added to a place having a high shearing force such as a treatment process. The amount added is preferably 0.05 to 1.0% by weight with respect to the raw waste paper.

If necessary, the deinking agent of the present invention may be a known deinking agent that has been generally used in the past, such as higher alcohol sulfate, polyoxyalkylene higher alcohol sulfate, alkylbenzene sulfonate and the like. It is also possible to use together.

The most preferred embodiment of the deinking agent of the present invention is (a) component (crystallization inhibitor): ester of polyglycerin having a degree of polymerization of 2 to 8 and higher fatty acid having 16 to 18 carbon atoms (b) component ( Fatty acid mixture): C ₁₄ saturated fatty acids and C ₁₆
Fatty acid mixture consisting of a saturated fatty acid of saturated fatty acids and C ₁₈ (c) component (nonionic surfactant): nonionic surfactant obtained by adding ethylene oxide to higher alcohol of 16 to 18 carbon atoms, propylene oxide block or random Activator or C16-18 (portion excluding carboxyl group)
Is a combination of nonionic surfactants obtained by block-wise or randomly adding ethylene oxide and propylene oxide to the higher fatty acid. In this case
The component (a) is 0.1 to 10% by weight, the component (b) is 10 to 30% by weight,
The component (c) is incorporated in the composition in a proportion of 60 to 90% by weight. In this case, the deinking effect is most excellent.

[0032]

INDUSTRIAL APPLICABILITY The deinking agent for recycling used paper of the present invention is used in newspapers, magazines, high-quality used paper, OA used paper, or offset ink,
It is possible to obtain a high-quality recycled pulp having a high whiteness and a low residual ink, which has an excellent ability to remove the ink separated from various printing waste papers printed with letterpress inks, toner inks and the like. In addition, since it has excellent defoaming properties, there is no foaming trouble in the deinking process, and it is a liquid product at room temperature compared to when using saturated fatty acids as it is, so it is easy to handle, and no special addition equipment or heating equipment is required. It has an excellent feature that it enables stable operability.

[0033]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Examples 1 to 6 and Comparative Examples 1 to 8 Deinking agents for recycling used paper were prepared with the following compositions.

Comparative Example 1-Fatty acid mixture C ₁₄ / C ₁₆ / C ₁₈ (50/25/25%): 25% by weight-Nonionic surfactant: 65% by weight RO (EO) ₂₀ (PO) ₂₀ H (Average carbon number of R is 18, HLB = 4.0) ・ Ion-exchanged water: 10% by weight.

Example 1-Fatty acid mixture C ₁₄ / C ₁₆ / C ₁₈ (50/25/25%): 25% by weight-Nonionic surfactant: 65% by weight RO (EO) ₂₀ (PO) ₂₀ H (Average carbon number of R 18, HLB = 4.0) ・ Crystallization inhibitor: 0.5% by weight _{Hexaglycerin tetrafatty} acid ester C ₁₆ / C ₁₈ / C _18F1 (35/55/10%, composition of fatty acid constituting ester, The same shall apply hereinafter) ・ Ion exchanged water: 9.5% by weight.

Example 2 ・ Fatty acid mixture C ₁₄ / C ₁₆ / C ₁₈ (50/25/25%): 25% by weight ・ Nonionic surfactant: 65% by weight Alkylamine alkylene oxide represented by the following formula Adjunct

[0038]

Embedded image

Crystallization inhibitor: 2% by weight _{Hexaglycerin tetrafatty} acid ester C ₁₆ / C ₁₈ / C _18F1 (35/55/10%) Ion-exchanged water: 8% by weight.

Example 3 Fatty acid mixture C ₁₄ / C ₁₆ / C ₁₈ (50/25/25%): 25% by weight Nonionic surfactant: 65% by weight RO (EO) ₂₀ (PO) ₂₀ H (Average carbon number of R is 18, HLB = 4.0) ・ Crystallization inhibitor: 5% by weight _{Hexaglycerin tetrafatty} acid ester C ₁₆ / C ₁₈ / C _18F1 (35/55/10%) ・ Ion-exchanged water: 5% by weight .

Comparative Example 2 Fatty Acid Mixture C ₁₄ / C ₁₆ / C ₁₈ (50/25/25%): 20.8% by Weight Nonionic Surfactant: 54.2% by Weight RO (EO) ₂₀ (PO) ₂₀ H (Average carbon number of R is 18, HLB = 4.0) ・ Crystallization inhibitor: 25% by weight _Hexaglycerin tetra fatty acid ester C ₁₆ / C ₁₈ / C _18F1 (35/55/10%).

Example 4 The following nonionic surfactants are used in place of the nonionic surfactants of Example 2. _{RCOO (EO) 25 (PO)} 10 H [R = fatty acid residue of _{C 18 / C 18F1 (20/80%} ), HLB = 8.
7].

Comparative Example 3 Instead of the nonionic surfactant of Example 2, the following nonionic surfactants are used. _{RO (PO) 5 (EO)} 5 (PO) 5 H _{[R = C 16 / C 18 (} 20/80%), HLB = 0.7 ].

Comparative Example 4 The following nonionic surfactant was used in place of the nonionic surfactant of Example 2. RCOO (EO) ₄₀ H [R = fatty acid residue of _{C 18 / C 18F1 (20/80%} ), HLB = 15.
1].

Example 5 The following crystallization inhibitor is used in place of the crystallization inhibitor of Example 2. Glycerin difatty acid ester _C18 / _C18F1 (45/55%).

Example 6 Instead of the crystallization inhibitor of Example 2, the following crystallization inhibitor is used. Sucrose _trifatty acid ester C ₁₆ / C ₁₈ / C _18F1 (45/11/43%).

Comparative Example 5 Hexaglycerin is used in place of the crystallization inhibitor of Example 2.

Comparative Example 6 Fatty acid C ₁₈ (100%): 25% by weight Nonionic surfactant: 65% by weight RO (EO) ₂₀ (PO) ₂₀ H (R has an average carbon number of 18, HLB = 4.0) ) ・ Ion-exchanged water: 10% by weight.

Comparative Example 7 Fatty acid C _18F1 (100%): 40% by weight Nonionic surfactant: 50% by weight RO (EO) ₂₀ (PO) ₂₀ H (R has an average carbon number of 18, HLB = 4.0) ) ・ Ion-exchanged water: 10% by weight.

Comparative Example 8 ・ Fatty acid mixture C ₁₆ / C ₁₈ (20/80%): 20% by weight ・ Glycerin monostearyl ester: 2% by weight ・ α-olefin sulfonate: 0.5% by weight ・ Ion exchanged water: 77.5 weight%.

In each of the above examples, "C _n " is a saturated fatty acid having n carbon atoms, and "C _nF1 " is an unsaturated bond having n carbon atoms.
Means an unsaturated fatty acid having two.

<Production of Deinking Agent> Examples 1 to 6 and Comparative Example 1
The deinking agents Nos. 7 to 7 were prepared by charging the above components all at once, uniformly dissolving them with a two-blade DC stirrer while raising the temperature to about 60 ° C., and then continuing stirring and cooling to about 30 ° C. Further, the deinking agent of Comparative Example 8 was prepared by batch-mixing the above components,
While raising the temperature to about 80 ° C., uniform emulsification was performed with a two-blade DC stirrer, and then stirring was continued to cool to about 30 ° C. to prepare. The deinking agent of Comparative Example 8 was in the form of an emulsion.

<Evaluation of Deinking Agent Performance> As an evaluation of storability, the static stability and recovery of the deinking agent obtained above were evaluated by the following methods.

(1) Stability in static form The stability of the morphology after 24 hours was evaluated by placing the product in a static state in an incubator at each temperature. Table 1 shows the results.
The symbols in the table have the following meanings. No change in liquid state: ◎ Crystal precipitation: △ Solidification or separation: ×

[0055]

[Table 1]

(2) Recoverability Low temperature: 30 ° C. after standing in an incubator at −5 ° C. for 24 hours
The morphological recoverability after standing for 24 hours in the incubator was evaluated. High temperature: After standing in an incubator at 60 ° C for 24 hours, the recoverability of the morphology after standing for 24 hours in an incubator at 30 ° C was evaluated.

The results are shown in Table 2. The symbols in the table have the following meanings. No change in liquid state: ◎ Crystal precipitation: △ Solidification or separation: ×

[0058]

[Table 2]

(Results) In Examples 1 to 5 and Comparative Example 7, there was almost no precipitation of fatty acid crystals at normal temperature (fatty acid was dissolved).
It can be seen that the state is stable even with temperature changes. On the other hand, in Comparative Examples 1 to 6, crystals are precipitated even at room temperature. Comparative Example 8 has a high stationary stability in an emulsified state, but becomes significantly unstable due to a temperature change.

<Deinking performance> Using the deinking agent obtained above, the following deinking test was carried out to compare the deinking performance.

2 raw waste paper (newspaper / flyer = 75/25)
After shredding into 5 cm pieces, put it in a table disintegrator and put caustic soda 1 in it.
% (Vs. raw material), sodium silicate 3% (vs. raw material), 30% hydrogen peroxide 3% (vs. raw material), deinking agent 0.4% in terms of active ingredient
(Vs. raw material), and add water, pulp concentration 5%, at 40 ℃
Disaggregated for 10 minutes. After aging for 60 minutes at 40 ° C., water was added to make the pulp concentration 1%, and a flotation treatment was performed at 30 ° C. for 10 minutes. The pulp slurry after flotation was concentrated to a concentration of 10%, water was added to restore the concentration to 1% again, and a pulp sheet was prepared using a tapping sheet machine and dried by ventilation.

The whiteness and the residual ink area ratio of the obtained pulp sheet were measured. In addition, residual fatty acid (soap) was confirmed. The whiteness was measured by a colorimeter and the residual ink area ratio was measured by an image analyzer (× 100) to obtain the residual ink area ratio (%). Table 3 shows the results.

In Table 3, Comparative Example 9 assumes conventional addition equipment, and the fatty acid is solid (flakes) in the formulation of Comparative Example 1.
The same deinking treatment as described above was carried out after the addition.

[0064]

[Table 3]

(Results) It can be seen that Examples 1 to 6 have good ink cohesiveness and ink releasability and are excellent in deinking quality. In Comparative Examples 1 to 6, the deinking performance is poor because the deinking agent has a non-uniform state. Further, Comparative Example 7 had relatively good stability, but the ink removability was poor because the ink cohesiveness was poor and the flotator had a low foaming property.
In Comparative Example 8, the ink releasability was poor, and the residual ink area ratio was inferior. Further, in Comparative Example 9 (conventional method), the fatty acid (soap) remained until the end, and the fatty acid was not mixed well into the system, so the deinking quality was poor.

Examples 7 to 10 and Comparative Example 10 Deinking agents having the compositions shown below were prepared in the same manner as in Examples 1 to 6 and evaluated in the same manner as in Examples 1 to 6. . The results are shown in Tables 4-6.

[0067] Comparative Example 10 - fatty acid mixtures: 20 _{wt% C 14 / C 16 / C} 18 (50/25/25) · nonionic surfactant: 70 wt% tallow / sorbitol (1 / 0.5 molar ratio) Random alkylene oxide adduct (EO = 70 mol, PO = 40 mol, HLB)
= 6.0] Example 7 - fatty acid mixtures: 20 _{wt% C 14 / C 16 / C} 18 (50/25/25) · nonionic surfactant: 78 wt% tallow / sorbitol (1 / 0.5 molar ratio) Random alkylene oxide adduct (EO = 70 mol, PO = 40 mol, HLB)
= 6.0] - crystallization inhibitor: 2 wt% hexaglycerol tetra fatty acid ester _{C 16 / C 18 / C 18F1} (35/55/10%).

Example 8 Sorbitol _tetrafatty acid ester [C ₁₄ / C ₁₆ / C ₁₈ / C _18F1 ( _10/15/25 /
50%)], and otherwise the composition is the same as in Example 7.

Example 9 The crystallization inhibitor in Example 7 was changed to sorbitan trifatty acid ester [C ₁₂ / C ₁₄ / C ₁₆ (60/25/15)],
Otherwise, the composition is the same as in Example 7.

Example 10 The composition is the same as in Example 2 except that the nonionic surfactant in Example 2 was changed to the following compound. RO (PO) ₅ (EO / PO) _(15/5) (EO) ₅ (PO) ₁₀ H [R = C ₁₈ , HLB =
4.0].

[0071]

[Table 4]

[0072]

[Table 5]

[0073]

[Table 6]

Claims (17)

[Claims] 1. A deinking agent for recycling used paper, which comprises a liquid composition obtained by dissolving (a) a crystallization inhibitor and (b) a fatty acid mixture in (c) a nonionic surfactant. . 2. The liquefaction index of the liquid composition is 0.8 to 1.
The deinking agent for recycling used paper according to claim 1, which is in the range of 2. 3. The deinking agent for recycling used paper according to claim 1 or 2, wherein (a) the crystallization inhibitor is at least one polyhydric alcohol fatty acid ester. 4. The polyhydric alcohol fatty acid ester is
Glycerin, diglycerin or polyglycerin having 9 to 90 carbon atoms, and saturated fatty acid having 12 to 22 carbon atoms or 16 carbon atoms in total
The deinking agent for recycling used paper according to claim 3, which is an ester of 22 to 22 unsaturated fatty acids. 5. The polyhydric alcohol fatty acid ester is
Sucrose and saturated fatty acids with 12-22 total carbons or 16-total carbons
The deinking agent for recycling used paper according to claim 3, which is an ester of 22 unsaturated fatty acids. 6. The polyhydric alcohol fatty acid ester is
Sorbitan and saturated fatty acids with 12 to 22 carbon atoms or total carbon number
The deinking agent for recycling used paper according to claim 3, which is an ester with an unsaturated fatty acid of 16 to 22. 7. The polyhydric alcohol fatty acid ester is
The deinking agent for recycling used paper according to claim 3, which is an ester of sorbitol and a saturated fatty acid having a total carbon number of 12 to 22 or an unsaturated fatty acid having a total carbon number of 16 to 22. 8. A crystallization inhibitor (a) in an amount of 0.05 to 20% by weight based on the total amount of (b) a mixture of fatty acids and (c) a nonionic active agent.
The deinking agent for recycling used paper according to any one of claims 1 to 7, which is contained. 9. The deinking agent for recycling used paper according to any one of claims 1 to 8, wherein the fatty acid mixture (b) is a saturated fatty acid having a total carbon number of 8 to 24. 10. (b) The fatty acid mixture has a total carbon number of 14-18.
The deinking agent for recycling used paper according to any one of claims 1 to 9, which contains the saturated fatty acid as described above as an essential component. 11. A compound obtained by (c) a nonionic surfactant obtained by random addition or block addition of an alkylene oxide having 2 to 4 carbon atoms to alcohols, amides or fatty acids having active hydrogen, or those. The deinking agent for recycling used paper according to any one of claims 1 to 10, which comprises the fatty acid esterified product. 12. (c) The nonionic surfactant is an alkylene oxide adduct of a saturated or unsaturated primary or secondary alcohol having a total carbon number of 10 to 24 or an alkylphenol having a total carbon number of 8 to 12. The deinking agent for recycling used paper according to any one of claims 1 to 10, which contains the alkylene oxide adduct of 1). 13. The waste paper according to claim 1, wherein the nonionic surfactant (c) contains an alkylene oxide adduct of a saturated or unsaturated higher fatty acid having a total carbon number of 10 to 24. Deinking agent for reproduction. 14. The nonionic surfactant (c) contains an alkylene oxide adduct of a saturated or unsaturated primary or secondary amine having 8 to 36 carbon atoms in total. The deinking agent for recycling used paper according to item 1. 15. The mixture of (c) an oil and fat consisting of an ester of a saturated or unsaturated fatty acid having a total carbon number of 8 to 24 and glycerin and a polyhydric alcohol having a valence of 2 to 10 as the nonionic surfactant. 1 to 10 containing an alkylene oxide adduct.
The nonionic surfactant according to any one of 1. 16. The weight ratio of (b) fatty acid mixture to (c) nonionic activator is (b) / (c) = 5/95 to 40/60. Deinking agent for recycled waste paper described. 17. A deinking agent for recycling used paper, comprising the liquid composition according to any one of claims 1 to 16 and 40% by weight or less of water based on the liquid composition.