JP2010053458A - Deinking agent composition for recycling paper from waste paper, deinking agent kit for recycling paper from waste paper, and method of recycling paper from waste paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deinking agent composition or the like for recycling paper from waste paper, capable of efficiently obtaining recycled pulp of high whiteness with a low content of residual ink therein without a foaming problem by suppressing excessive foaming and by enhancing the capacity of collecting separated ink in the (step of) floatation treatment constituting the step of producing the recycled pulp, which composition is used in obtaining recycled pulp from printed waste paper resulting from news paper, a flier, a magazine, paper copies from OA machines, or the like. <P>SOLUTION: The deinking agent composition for recycling paper from waste paper comprises 10-55 wt.% of a 12-18C alcohol and a deinking agent that removes ash. The deinking agent preferably is in a form of a compound represented by general formula (I) as follows: R<SB>1</SB>O-PO<SB>m</SB>-(EO<SB>n</SB>/XO<SB>k</SB>)-R<SB>2</SB>. There is provided a method of recycling paper from waste paper for use in recycling waste paper wherein the deinking agent composition is employed, which method includes disintegrating and washing waste paper and subjecting the disintegrated and washed waste paper to a flotation treatment. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a deinking agent composition for used paper recycling and a deinking agent kit for recycling used paper, which is used when obtaining recycled pulp from printed used paper such as newspapers, flyers, magazines, and copied OA used paper, and efficient using the same The present invention relates to a method for recycling used paper.

  In order to recycle used printing paper such as newsprint, magazines, OA wastepaper, information paper, and leaflet wastepaper, it has been used again as a papermaking raw material. In particular, in recent years, the recycling of used printed paper has become increasingly important from the viewpoint of effective use of resources and environmental protection. The use of recycled pulp is also expanding.

In general, the deinked pulp (DIP) manufacturing process for recycling printed waste paper mainly includes a peeling (disaggregation) process (process), an aging process (process), a dehydration / cleaning process (process), and a flotation process (process). ) Is included.
The peeling (separating) process is a process of mechanically peeling the ink using a peeling machine such as a pulper, kneader, or disperser. The aging process is a process of chemically removing ink or bleaching pulp. In these stripping treatments and aging treatments, in general, together with agents such as alkali agents such as caustic soda, sodium carbonate and sodium silicate, bleaching agents such as hydrogen peroxide and sodium hypochlorite, and chelating agents such as EDTA and DTPA. A deinking agent is used. Examples of the deinking agent include anionic activators such as fatty acids, alkylbenzene sulfonates, α-olefin sulfonates, higher alcohol sulfates, and dialkyl sulfosuccinates, and alkylene oxide additions such as higher alcohols, alkylphenols, and fatty acids. And nonionic surfactants such as alkanolamides are used. After the peeling (disaggregation) treatment and the aging treatment, the obtained pulp slurry is dehydrated and washed as necessary. In the dehydration and washing treatment, the pulp slurry is concentrated and then diluted again to an appropriate concentration. The pulp slurry subjected to the above treatment is further subjected to a flotation treatment in order to remove the ink separated from the pulp. The flotator used in the flotation treatment blows bubbles into the pulp slurry, attaches ink to the bubbles, floats and separates them, and discharges them as floss out of the system. In this flotation process, development of a technique for removing ink that has been peeled off by appropriate foaming is desired. In particular, in recent years, high G / L type floatator devices have been increasing and foaming properties have become higher, and because there is an increase in used paper that tends to foam due to diversification of used waste paper, excessive foaming has occurred. Therefore, there is a strong demand for the development of a technology that removes ink without removing it.

  As such a technique, for example, a deinking agent composition using a deinking agent having a higher cloud point and a lower deinking agent than the temperature of the flotation treatment (process) is known (see Patent Document 1). ). In addition, a deinking agent composition containing a compound having a specific HLB value or a compound having a solubility in water of not more than a specific value as an additive is known (see Patent Document 2).

  Furthermore, it is known that an ethylene oxide adduct of a specific higher alcohol is used as an aggregating agent for ink (see Patent Document 3).

JP-A-6-257081 JP 2000-265385 A JP 2003-119683 A

  This invention makes it a subject to achieve the following objectives. That is, the present invention is used when recycled pulp is obtained from printed waste paper such as newspapers, flyers, magazines, and OA waste paper, and excessive foaming is suppressed in the flotation treatment (step) in the manufacturing process of the recycled pulp. In addition, a deinking agent composition for used paper recycling and a deinking agent for recycling used paper that can efficiently obtain a recycled pulp with high whiteness and little residual ink by improving the collecting ability of the release ink. It is an object of the present invention to provide kits and a used paper recycling method that can efficiently obtain a recycled pulp that has no bubble trouble and has high whiteness and little residual ink.

Means for solving the above problems are as follows. That is,
<1> A deinking composition for recycling recycled paper, comprising a deinking agent and 10 to 55% by weight of an alcohol having 12 to 18 carbon atoms.
<2> The deinking agent composition for used paper recycling according to <1>, wherein the deinking agent is represented by the following general formula (I).
_{R 1 O-PO m - (} EO n / XO k) -R 2 ··· formula (I)
However, in the general formula (I), _{R 1} represents an alkyl or alkenyl group having 12 to 22 carbon atoms, _{R 2} represents a hydrogen atom, or a number 2-3 acyl group carbons, PO is propylene Represents an oxide unit, EO represents an ethylene oxide unit, XO represents an alkylene oxide unit having 4 or more carbon atoms, m, n, and k are the number of added moles, and m is 1 to 8, n. 10 to 40, k represents a number such that the total number of carbon atoms in XO is 3 to 120, EO and XO may be block copolymer units or random copolymer units. Also good.
<3> The ratio of (B) to the total amount of (A) and (B) in which (A) the deinking agent and (B) the alcohol having 12 to 18 carbon atoms are contained in the pulp slurry in the flotation process. Is a deinking agent kit for recycling used paper, which is used by adding up to the flotation step so as to be 10 to 55% by weight.
<4> (A) The deinking agent is a deinking agent kit for used paper recycling according to the above <3> represented by the following general formula (I).
_{R 1 O-PO m - (} EO n / XO k) -R 2 ··· formula (I)
However, in the general formula (I), _{R 1} represents an alkyl or alkenyl group having 12 to 22 carbon atoms, _{R 2} represents a hydrogen atom, or a number 2-3 acyl group carbons, PO is propylene Represents an oxide unit, EO represents an ethylene oxide unit, XO represents an alkylene oxide unit having 3 or more carbon atoms, m, n, and k are the number of added moles, and m is 1 to 8, n. 10 to 40, k represents a number such that the total number of carbon atoms in XO is 3 to 120, EO and XO may be block copolymer units or random copolymer units. Also good.
<5> A used paper recycling method used for recycling used paper,
Including deaggregating, washing and flotation of waste paper,
The used paper recycling deinking agent composition according to <1> or <2>, or the used paper recycling deinking agent kit according to <3> or <4>. It is.
<6> The used paper recycling method according to <5>, wherein the flotation is performed at a gas-liquid ratio (G / L volume ratio) of 4 or more.

  According to the present invention, the above-described problems can be solved and the object can be achieved, and the recycled pulp is used for obtaining recycled pulp from used printed paper such as newspapers, flyers, magazines, and copied OA used paper. In the flotation process (process) in the manufacturing process of the above, by suppressing excessive foaming and improving the collecting ability of the release ink, it is possible to efficiently obtain regenerated pulp with no white ink and high residualness and low residual ink. Used paper recycling deinking agent composition, used paper recycling deinking agent kit, and used paper recycling method capable of efficiently obtaining recycled pulp with high whiteness and little residual ink using these Can be provided.

[Deinking agent composition for used paper recycling and deinking agent kit for recycling used paper]
The deinking agent composition for used paper recycling and the deinking agent kit for used paper recycling of the present invention contain at least a deinking agent and an alcohol having 12 to 18 carbon atoms, and further other components appropriately selected as necessary. Containing.
The deinking agent kit for recycling used paper according to the present invention is not prepared as a composition in which the deinking agent and the alcohol having 12 to 18 carbon atoms are mixed, but is prepared as a separate component (two-component type), In the pulp slurry in the flotation step described later, the amount of the alcohol having 12 to 18 carbon atoms relative to the total amount of the deinking agent and the alcohol having 12 to 18 carbon atoms is 10 to 55% by weight. Although it is different from the deinking agent composition for used paper recycling of the present invention in that it is added before the rotation step, it is the same in other points. Hereinafter, the deinking agent composition for recycling used paper and the deinking agent kit for recycling used paper according to the present invention will be described.

  The deinking agent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a compound obtained by adding ethylene oxide and propylene oxide to a higher alcohol, a higher fatty acid ester, a higher fatty acid, etc. (alkylene oxide addition) Type nonionic surfactant type deinking agent) and the like. As such a deinking agent, for example, compounds described in JP-A No. 06-257081 can be preferably mentioned.

In the present invention, preferable examples of the deinking agent include compounds represented by the following general formula (I).
_{R 1 O-PO m - (} EO n / XO k) -R 2 ··· formula (I)
However, in the general formula (I), R ₁ represents an alkyl group or alkenyl group having 12 to 22 carbon atoms, and palmityl alcohol, stearyl alcohol, and the like are preferable. R ₂ represents a hydrogen atom or an acyl group having 2 to 3 carbon atoms, preferably a hydrogen atom. PO represents a propylene oxide unit. EO represents an ethylene oxide unit. XO represents an alkylene oxide unit having 3 or more carbon atoms. m, n, and k are the number of added moles, and m represents a number of 1 to 8, with 2 to 6 being preferred. n represents a number of 10 to 40, but 15 to 35 is preferable. k represents a number such that the total number of carbon atoms in XO is 3 to 120. EO and XO may be block copolymer units or random copolymer units.
These deinking agents may be used alone or in combination of two or more.

There is no restriction | limiting in particular as content of the said deinking agent, Although it can select suitably according to the objective, 45 to 90 weight% is preferable.
When the content is less than 45% by weight, the ink peeling force from the waste paper and the foamability in the flotation process may be extremely reduced, and when it exceeds 90% by weight, excessive foaming may be suppressed. There are things that cannot be done. On the other hand, when it is within the above numerical range, it is advantageous in that it has excellent ink peelability from used paper and can effectively suppress foaming in the previous flotation treatment (process).

Although it can select suitably as said C12-C18 alcohol, For example, lauryl alcohol (C12), myristyl alcohol (C14), iso-stearyl alcohol (C18) etc. are mentioned suitably. These may be used individually by 1 type and may use 2 or more types together. Among these, it is preferable that it contains C12-14 or branched higher alcohols such as iso-stearyl alcohol, and unsaturated alcohols such as oleyl alcohol because they are liquid. The alcohol is preferably in a liquid state under the conditions of the flotation process because it is easier to obtain a low-foaming effect when it is uniformly incorporated into the foam film.
If the alcohol has a carbon number of 6 or less, for example, the amount of froth increases and excessive foaming cannot be improved. A decrease in the collection efficiency is observed, and if it is less than 12, it is not preferable in that the effect of the present invention cannot be obtained. On the other hand, when the carbon number is 12 to 18, it is advantageous in that the effect of the present invention can be obtained by using it together with the deinking agent.

As content of the said C12-C18 alcohol, 10 to 55 weight% is preferable, for example, and 15 to 50 weight% is more preferable.
When the content is less than 10% by weight, the effect of reducing foam is not sufficient, and the effect of the present invention may not be sufficiently obtained. When the content exceeds 55% by weight, the amount of foam is too small and the processing operation is performed. May become impossible, and the whiteness of the regenerated pulp may be extremely reduced. On the other hand, when the content is 10 to 55% by weight, there is no such thing, and excessive foaming of the floatator can be suppressed, and a decrease in ink collecting ability can be suppressed / improved. This is advantageous in that the decrease in ink collecting ability can be mitigated.
In order to obtain the effect of suppressing excessive foaming, which is the effect of the present invention, and improving the collection efficiency of the release ink, in the flotation process, a surfactant component that leads to foaming other than the deinking agent is included as much as possible. In particular, it is preferable not to contain a nonionic surfactant having a cloud point exceeding the flotation temperature. Among nonionic surfactants having a cloud point exceeding the flotation temperature, it is particularly preferable not to include an ethylene oxide adduct to a higher alcohol or a higher fatty acid ester. Even when it is included, the flotation step exceeds the flotation temperature. It is preferable not to include a nonionic surfactant having a cloud point exceeding the amount of the alcohol having 12 to 18 carbon atoms of the present invention (by weight), and further to the amount of alcohol having 12 to 18 carbon atoms of the present invention. The content is preferably 50% by weight or less, but most preferably it is not substantially contained.
The temperature of the flotation step is usually 30 to 50 ° C., and thus varies depending on the flotation temperature condition to be used. Examples of nonionic surfactants having a cloud point exceeding the flotation temperature include, for example, In the case of an ethylene oxide adduct of dodecyl alcohol having 12 carbon atoms, an addition mole number of 6 moles or more is applicable. When an addition reaction of ethylene oxide to higher alcohols or fatty acid esters using an alkali catalyst or a solid catalyst as a catalyst, the resulting ethylene oxide adduct has a distribution in the number of moles added. The total amount of adducts having an added mole number or more that will have a cloud point exceeding the flotation temperature is within the above range with respect to the amount of the alcohol having 12 to 18 carbon atoms of the present invention. This is preferable for sufficiently obtaining the effects of the invention.
In addition, the measuring method of a cloud point follows the cloud point of the reference | standard oil-and-fat analysis test method 2.3.7-1990.

  The other components are not particularly limited, and well-known components used in the deinking agent composition used for waste paper recycling are preferably exemplified, for example, saturated or unsaturated fatty acids, organic deinking agents, An antifoaming agent, a foaming agent, etc. are mentioned suitably.

  There is no restriction | limiting in particular as said saturated fatty acid, Although it can select suitably according to the objective, For example, a C12-C18 compound is mentioned suitably. The combined use of the saturated fatty acid having 12 to 18 carbon atoms is advantageous in that the ink is aggregated and the ink collection efficiency in the flotation process is improved. Specific examples of the saturated fatty acid having 12 to 18 carbon atoms include stearic acid and palm kernel oil fatty acid (carbon number 12 to 14).

Examples of the organic deinking agent include anionic activators such as fatty acids, alkylbenzene sulfonates, α-olefin sulfonates, higher alcohol sulfates, dialkylsulfosuccinates, higher alcohols, alkylphenols, fatty acids and the like. Preferable examples include nonionic surfactants such as alkylene oxide adducts and alkanol amides.
The content of the other components may be in a range that does not impair the object of the present invention.

There is no restriction | limiting in particular as a manufacturing method of the deinking agent composition for used paper reproduction | regeneration of this invention, It can obtain by mixing each component mentioned above using a well-known method, an apparatus, etc.
The deinking agent composition for recycling used paper of the present invention may be a one-component composition in which the deinking agent and the alcohol are mixed, or the deinking agent and the alcohol are floated. It is good also as a two-component type composition mixed and used by the process (process). This two-pack type or more is the deinking agent kit for recycling used paper of the present invention.
In the deinking agent kit for recycling used paper according to the present invention, the deinking agent (component A) and the alcohol having 12 to 18 carbon atoms (component B) are separately contained in a container, for example, It may be composed of a container containing only the A component and a container containing only the B component, or a container containing the A component and the B component, and a container containing the A component or the B component. In addition, other components such as the fatty acid may be added to the containers.
The conditions for using the deinking agent composition for recycling used paper or the deinking agent kit for recycling used paper of the present invention are not particularly limited and may be appropriately selected depending on the intended purpose. It is common to use around ℃.

  The deinking agent composition for recycling used paper or the deinking agent kit for recycling used paper of the present invention is suitably used for deinking in a pulp slurry in a manufacturing process of deinked pulp manufactured using, for example, used printing paper as a papermaking raw material. In particular, it can be suitably used for a flotation treatment (step) in which impurities such as ink in the pulp slurry are removed together with foam (floss). The deinking agent composition for used paper recycling or the deinking agent kit for used paper recycling of the present invention suppresses a decrease in ink removal effect by the deinking agent and a decrease in pulp yield in a flotation process (process). Therefore, it can be particularly suitably used for the used paper recycling method of the present invention described below.

[Recycled paper]
The used paper recycling method of the present invention is a used paper recycling method used for recycling used paper, and includes used paper disaggregation (disaggregation process), washing (washing process), and flotation (flotation process). Other processes (processes) selected as appropriate, for example, kneading process, dispersion process, ripening bleaching process, washing / dehydration process, white water circulation process, white water treatment process, floss sludge disposal process, recycled pulp papermaking process, etc. The deinking agent composition for recycling used paper or the deinking agent kit for recycling used paper of the present invention is used.

The deinking process mainly consists of pulper and kneader, which are the disaggregation / ink peeling process, and the flotation of the ink collecting process, but the following patterns are representative examples including dehydration, washing, dilution, and bleaching processes. As mentioned.
(1) Pulper → Flotation → Washing (2) Pulper → Dehydration → Kneader → Bleaching → Dilution → Flotation → Washing (3) Pulper → Flotation A → Dehydration → Kneader → Dilution → Bleaching → Flotation B → Washing

(When used as a deinking agent composition for used paper recycling)
The step of adding the deinking agent composition for used paper recycling is not particularly limited and may be any step in the used paper recycling method. For example, a pretreatment step (ink removing step) of a flotation step such as a pulper or a kneader. ) Or in the flotation process. Further, the floss removed in the flotation step may be added to a secondary floatator that is further subjected to a flotation treatment and returned again to the pulp slurry in the deinked pulp manufacturing step. Among these, it is preferable to add to the pulp slurry at the stage of the ink peeling process. Moreover, as addition timing, one may be sufficient and plural may be sufficient.
Specifically, in the representative example of the deinking agent process, as the addition timing of the deinking agent composition for used paper recycling, for example, in the case of the above (1), it is added to the pulper in a lump or in the pulper and the flotation. Although it can be added in portions, it is often sufficient to add them to the pulper in practice. In the case of (2), it can be added all at once to the pulper, or it can be added separately to the pulper, kneader and / or flotation, but in order to ensure the concentration in the flotation, it is better to add it separately. It is efficient and divided addition to the pulper and kneader is more effective in practical use. In the case of (3), it can be added all at once to the pulper, or it can be added separately to the pulper and / or the flotation A and the kneader and / or the flotation B, but in order to ensure the concentration in the flotation It is more efficient to add it in divided portions, and it is effective to add them to the pulper and kneader practically.

(When used as a deinking agent deinking agent kit for used paper recycling)
The step of adding the deinking agent kit for recycling used paper is not particularly limited, but the A component and the B component may be added and mixed by the flotation step at the latest, and this condition is satisfied. As long as it can be added at any time.

  Specifically, in the representative example of the deinking agent process, the addition timing of the deinking agent deinking agent kit for recycling used paper is, for example, in the case of (1), the deinking agent is a pulper for disaggregation or ink peeling. The alcohol having 12 to 18 carbon atoms of the present invention can be added by pulper or flotation, but it is more preferable to add it to the flotation because it is easy to adjust the floss amount by controlling the addition amount. In the case of the above (2), the deinking agent can be added to the pulper in a batch or dividedly added to the pulper and kneader, and the divided addition is more effective for collecting ink in the flotation. The alcohol having 12 to 18 carbon atoms of the present invention can be divided and added to a pulper and a kneader and / or a flotation. However, in order to ensure the concentration in the flotation, the alcohol was added to the kneader and / or the flotation. It is more efficient, and practically, divided addition to the kneader is more effective from the viewpoint of uniform dispersion. In the case of (3), the deinking agent can be added to the pulper in a batch or dividedly added to the pulper and kneader, and the divided addition is more effective for collecting ink in the flotation. The alcohol having 12 to 18 carbon atoms of the present invention can be added to the pulper at once, or divided into the pulper and / or the flotation A and the kneader and / or the flotation B. In order to ensure, it is more efficient to add by dividing, and practically, divided addition to the pulper and the kneader is more effective from the viewpoint of uniform dispersion. In any case, the alcohol having 12 to 18 carbon atoms of the present invention needs to be 10 to 55% with respect to the deinking agent at the time of flotation.

In the flotation step, the gas / liquid ratio of G (gas) / L (liquid) is preferably 4 or more.
When the gas-liquid ratio (G / L) is 4 or more, excessive foaming tends to occur in the flotation process, and it is necessary to change conditions such as reducing the amount of deinking agent added to suppress foaming. Since whiteness is also likely to decrease, by suppressing excessive foaming of the present invention and improving the collection efficiency of release ink, it is possible to efficiently obtain recycled pulp with high whiteness and little residual ink by improving the collection efficiency of release ink. This is advantageous in that the effect of being able to be produced appears more and the necessity of using the present invention becomes relatively high.

The addition amount of the deinking agent composition for recycling used paper or the deinking agent kit for recycling used paper is not particularly limited and may be appropriately selected depending on the intended purpose. 005 to 1% by weight is preferable, and 0.01 to 0.5% by weight is more preferable.
When the addition amount is less than 0.005% by mass, the deinking effect may be insufficient, and when it exceeds 1% by mass, the pulp yield may be reduced.

  Hereinafter, the contents of the present invention will be described with reference to examples. The contents of the present invention are not limited to the contents of the following examples. The unit “%” represents “% by weight” unless otherwise specified.

  After cutting raw paper (newspaper / flyer paper = 5/5) into 5cm x 5cm, put it into a low-concentration pulper (low concentration pulper lab machine, manufactured by Kumagai Riki Kogyo Co., Ltd.), and 0.5% caustic soda against the weight of raw paper %, No. 3 sodium silicate 0.2 wt% was added. Further, a compound A in Table 1 below and a deinking agent were mixed to prepare a deinking composition for used paper recycling, and 0.2% by weight was added to the raw used paper.

なお、上記化合物Ａの欄において使用した物質は表２に示す。なお、「％」は、重量％を表し、化合物Ａの配合率は化合物Ａと脱墨剤を混合して得た古紙再生用脱墨組成物中の配合率を表し、低泡化性能の評価、インキ捕集性能、インキ捕集効率の評価は、後述のとおりである。

The substances used in the column for Compound A are shown in Table 2. “%” Represents% by weight, and the compounding ratio of Compound A represents the compounding ratio in the deinking composition for used paper recycling obtained by mixing Compound A and the deinking agent. The evaluation of the ink collecting performance and the ink collecting efficiency is as described later.

ＥＯ：酸化エチレン、ＰＯ：酸化プロピレン（数字は平均付加モル数を示す）

その他の試薬
プロピレングリコール（関東化学試薬特級）
イソプロピルアルコール（関東化学試薬特級）
２−エチルヘキサノール（関東化学鹿１級）

EO: Ethylene oxide, PO: Propylene oxide (The numbers indicate the average number of moles added)

Other reagents propylene glycol (Kanto Chemical Reagent Special Grade)
Isopropyl alcohol (Kanto chemical reagent special grade)
2-Ethylhexanol (Kanto Chemical Deer Class 1)

  Subsequently, warm water was added so that the pulp concentration was 5% by weight, and pulper treatment was performed at 45 ° C. for 10 minutes. The obtained pulp slurry was diluted with warm water to a pulp concentration of 1% by weight and subjected to a flotation treatment (process) at 45 ° C. for 3 minutes (using a BOX type laboratory machine manufactured by Kumagai Riki Kogyo Co., Ltd.). In addition, G / L at this time was set to 4.8.

  The floss generated in the flotation process (step) was scraped 5 times per minute, and the total weight scraped was taken as the floss amount. Sample sheets before and after the flotation treatment (process) were prepared with a TAPPI paper machine, and the whiteness was measured with a color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd., spectral color / whiteness meter PF-10). The whiteness increase due to the flotation process (step) was calculated.

  Next, after cutting raw paper (newspaper / flyer paper = 6/4) into 5cm x 5cm, it is put into a low-concentration pulper (low concentration pulper lab machine, manufactured by Kumagai Riki Kogyo Co., Ltd.), and caustic soda 1 0.0% by weight was added. Further, a blend of Compound A in Table 3 and a deinking agent was prepared, and 0.2% by weight was added to the raw waste paper.

The substances used in the column for Compound A are shown in Table 2. “%” Represents wt%, and evaluation of excessive foaming suppression performance (low foaming performance), ink collection performance, and ink collection efficiency are as described below.
The production of the lab synthesis sample was performed as follows. For Comparative Example 10, 300 g of stearyl alcohol and 20 g of 48% by weight potassium hydroxide aqueous solution as a catalyst were charged into an autoclave, the inside of the reaction system was sufficiently purged with nitrogen, and then dehydrated under reduced pressure. The alkylene oxide was introduced to carry out an addition reaction. The addition reaction was carried out in the order of propylene oxide (hereinafter referred to as PO), ethylene oxide (hereinafter referred to as EO) and PO to obtain a block adduct. The reaction temperature was 120 ° C. for PO addition, 160 ° C. for EO addition, and a pressure of 3.0 kg / cm ² or less.
In Comparative Example 11, 300 g of a branched alcohol having 13 carbon atoms and 4 g of 40 wt% potassium hydroxide as a catalyst were charged into an autoclave, and a block adduct was prepared in the same manner as in Comparative Example 10.
Comparative Example 12 was prepared by charging 300 g of stearyl alcohol and 1.0 g of 40 wt% potassium hydroxide as a catalyst into an autoclave, introducing a predetermined amount of EO, and performing an addition reaction.

Subsequently, warm water was added so that the pulp concentration was 3.5% by weight, and pulper treatment was performed at 40 ° C. for 10 minutes. After the obtained pulp slurry was concentrated to a pulp concentration of 30% by weight, caustic soda 1.0% by weight, No. 3 sodium silicate 1.0% by weight, fatty acid (Lion Corporation CY-1000) 0.05% by weight Then, 0.4% by weight of hydrogen peroxide was added, and warm water was further added to obtain a pulp concentration of 25% by weight, followed by aging at 60 ° C. for 2 hours. After aging, diluted with warm water to a pulp concentration of 1% by weight, and after adding 0.05% by weight of the deinking agent composition for recycling used paper containing the compound A in Table 2 and the deinking agent to the raw paper Flotation treatment (process) was performed at 45 ° C. for 10 minutes (manufactured by Kumagai Riki Kogyo, using a BOX type laboratory machine). The G / L at this time was set to 8.
The floss generated in the flotation process (step) was scraped 5 times per minute, and the total weight scraped was used as the floss amount. Sample sheets before and after the flotation treatment (process) were prepared with a TAPPI paper machine, and the whiteness was measured with a color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd., spectral color / whiteness meter PF-10). The whiteness increase due to the flotation process (step) was calculated.

<Evaluation criteria for low foaming performance (overfoaming suppression performance)>
A: Suppressed greatly (floss amount 200-300 g)
○: Suppression (floss amount 300-400 g)
Δ: Slightly suppressed (floss amount 400-540 g)
X: Equal to or more than blank (floss amount 540g or more)

<Calculation of ink collection efficiency>
The increase in whiteness per unit floss amount was calculated by the following formula, and this was defined as the ink collection efficiency (%).
Ink collection efficiency (%) = (increased whiteness before and after flotation / floss amount) × 100

Claims (6)

  (A) A deinking agent and (B) an alcohol having 12 to 18 carbon atoms are contained in a ratio of 10 to 55% by weight of (B) with respect to the total amount of (A) and (B). A deinking agent composition for recycling recycled paper. The deinking composition for used paper recycling according to claim 1, wherein the deinking agent (A) is represented by the following general formula (I).
_{R 1 O-PO m - (} EO n / XO k) -R 2 ··· formula (I)
However, in the general formula (I), _{R 1} represents an alkyl or alkenyl group having 12 to 22 carbon atoms, _{R 2} represents a hydrogen atom, or a number 2-3 acyl group carbons, PO is propylene Represents an oxide unit, EO represents an ethylene oxide unit, XO represents an alkylene oxide unit having 3 or more carbon atoms, m, n, and k are the number of added moles, m is 1 to 8, and n is 10 to 40, k represents a number such that the total number of carbon atoms in XO is 3 to 120, and EO and XO may be block copolymer units or random copolymer units. .   (A) The deinking agent and (B) the alcohol having 12 to 18 carbon atoms are contained in the pulp slurry in the flotation step so that the ratio of (B) to the total amount of (A) and (B) is 10 to 10. A used deinking agent kit for recycling used paper, which is used by adding up to the flotation step so as to be 55% by weight. The deinking agent kit for used paper recycling according to claim 3, wherein (A) the deinking agent is represented by the following general formula (I).
_{R 1 O-PO m - (} EO n / XO k) -R 2 ··· formula (I)
However, in the general formula (I), _{R 1} represents an alkyl or alkenyl group having 12 to 22 carbon atoms, _{R 2} represents a hydrogen atom, or a number 2-3 acyl group carbons, PO is propylene Represents an oxide unit, EO represents an ethylene oxide unit, XO represents an alkylene oxide unit having 3 or more carbon atoms, m, n, and k are the number of added moles, m is 1 to 8, and n is 10 to 40, k represents a number such that the total number of carbon atoms in XO is 3 to 120, and EO and XO may be block copolymer units or random copolymer units. . A used paper recycling method used for recycling used paper,
Including deaggregating, washing and flotation of waste paper,
A used paper recycling method comprising the deinking agent composition for recycling used paper according to claim 1 or 2, or the deinking agent kit for recycling used paper according to claim 3 or 4.   The used paper recycling method according to claim 5, wherein the flotation is performed at a gas-liquid ratio (G / L volume ratio) of 4 or more.