JP2000129587A - Defoaming agent and composition for deinking treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition for deinking treatment, capable of not only effectively suppressing the amount of foam in a deinking step but also hardly obstructing the deinking effect of the deinking agent at all by compounding a specific defoaming agent with the deinking agent. SOLUTION: This deinking composition is obtained by compounding a defoaming agent of the formula: R1O-(C3H6O)n-H (R1 is a hydrocarbon or an acyl; n is 3-10) in the proportion of 0.1-30 wt.%, preferably 1-30 wt.%, more preferably 5-25 wt.% with a nonionic deinking agent of the formula: R2-O-(R3- O)m-R4 (R2 is a hydrocarbon or an acyl; R3 is an alkylene; R4 is H, a hydrocarbon or an acyl; m is a number of >=1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an antifoaming agent, particularly to an antifoaming agent suitable for use in a deinking process.

[0002]

2. Description of the Related Art Recycling of used paper for reproducing newspapers, magazines and the like to create new paper is a technique that has been used for a long time. However, in recent years, from the viewpoint of shortage of pulp resources and soaring prices, shortage of trees as raw materials, environmental protection, and the like, it has become increasingly important to effectively use waste paper. On the other hand, in the past, the use of deinked pulp was often paper for newspapers and magazines, but in recent years there has been a strong demand for high whiteness reproduction in order to develop it into various uses. Under such circumstances, the demand for performance improvement of a deinking agent that plays an important role in the deinking process is becoming stricter year by year.

[0003] Alcohol derivatives have been known for a long time as deinking agents used for recycling used paper. For example, JP-A-52-81107 discloses a primary alcohol ethoxylate obtained by adding ethylene oxide to an alkyl group having 8 to 22 carbon atoms, a secondary alcohol ethoxylate having 12 to 14 carbon atoms, and an alkylphenol ethoxylate. A waste paper recycling deinking agent is disclosed. JP 52
JP-A-114708 discloses a deinking composition comprising a secondary alcohol ethoxylate and an amide of an alkanolamine. JP-A-59-137588
Japanese Patent Application Publication No. JP-A-2005-115139 discloses a waste paper deinking agent comprising a polyether polyol having a bisphenol type structure as a hydrophobic group. JP-A-5-25789 discloses RO-
(AO) —H (AO is an alkylene oxide chain) and R
Discloses a deinking agent for waste paper recycling comprising an alkyl group or an alkenyl group having an average carbon number of 12.7 to 22.5.

[0004]

The deinking agent is originally required to have foaming and foaming properties. However, if the foaming power and foaming power are too large, bubbles overflow from the floatator during the deinking process. In the worst case, the process may be stopped. For this reason, the chemical structure and amount of the deinking agent were controlled so as to obtain the optimum foaming amount (floss amount), but the deinking conditions in the deinking process, the equipment used, and the composition of the waste paper to be deinked And the like are not always the same, so it was difficult to always obtain a constant foaming amount. In order to suppress the amount of foaming, an antifoaming agent may be used. For example, JP-A-3-68401 discloses {RO (AO)} X (where R is an alkyl group,
AO is an oxyalkylene chain, and X is a carboxylic acid residue). Also, JP-A-1-13
No. 5510 discloses RO (PO-EO) COR (where R is an alkyl group, an alkenyl group, an aryl group, etc .;
O is an oxypropylene group and EO is an oxyethylene group). JP-A-61-178
No. 005, RCOO (AO) (SO) H (where R is a hydrocarbon group, AO is an oxyalkylene group, SO
Is an oxystyrene group). JP-A-56-169583 discloses RO-EO.
An antifoaming agent represented by -PO-EO-COR '(where R is an alkyl group, an alkenyl group, EO is an oxyethylene group, PO is an oxypropylene group, and R' is a fatty acid residue) has been proposed. JP-A-9-313808 discloses RO
An ether ester antifoaming agent represented by-(PO)-(EO)-(PO) -COR 'has been proposed. However, conventional antifoaming agents such as these can suppress the amount of foaming, but cannot be used because they have an adverse effect on the deinking performance of the essential deinking agent.

[0005]

The inventors of the present invention have made intensive studies and have developed an antifoaming agent which does not adversely affect the deinking performance of the deinking agent. That is, the present invention provides the following general formula (1): R ¹ O— (C ₃ H ₆ O) _n —H (1) (wherein, R ¹ represents a hydrocarbon group or an acyl group, and n is 3 to 10) ) And a deinking composition containing the same.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the general formula (1), R ¹ represents a hydrocarbon group or an acyl group. Examples of the hydrocarbon group include an alkyl group, an alkenyl group, an aryl group, a cycloalkyl group, a cycloalkenyl group, and the like. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl, tertiary butyl, pentyl, isopentyl, and secondary pentyl.
Neopentyl, tertiary pentyl, hexyl, secondary hexyl, heptyl, secondary heptyl, octyl, 2-ethylhexyl, secondary octyl, nonyl, secondary nonyl, decyl, secondary decyl, undecyl, secondary undecyl, dodecyl, secondary Dodecyl, tridecyl, isotridecyl, secondary tridecyl, tetradecyl, secondary tetradecyl, hexadecyl, secondary hexadecyl, stearyl, icosyl, docosyl, tetracosyl, triacontyl, 2-butyloctyl, 2-butyldecyl, 2-hexyloctyl, 2
-Hexyldecyl, 2-octyldecyl, 2-hexyldecyl, 2-octyldodecyl, 2-decyltetradecyl, 2-dodecylhexadecyl, 2-hexadecyloctadecyl, 2-tetradecyloctadecyl, monomethyl-branched-isostearyl, etc. Is mentioned.

Examples of the alkenyl group include vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tetradecenyl, oleyl and the like. Examples of the aryl group include phenyl, toluyl, xylyl,
Cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, dodecylphenyl, Examples include phenylphenyl, benzylphenyl, styrenated phenyl, p-cumylphenyl, α-naphthyl, and β-naphthyl groups.

Examples of the cycloalkyl group and cycloalkenyl group include, for example, cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, methylcyclopentenyl, methylcyclohexenyl, methylcyclohepenyl And a thenyl group. Examples of the acyl group include acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivalyl, lauroyl, myristoyl, palmitoyl, stearoyl, behenoyl, acryloyl, propioloyl, metacloyl, crotonoyl, oleiroyl, benzoyl, phthaloyl, and succinyl. Preferred groups for R ¹ are those having 8 carbon atoms.
To 22 straight-chain alkyl groups or branched alkyl groups having 12 to 28 carbon atoms.

In the general formula (1), n represents the degree of polymerization of the oxypropylene group, and is from 3 to 10, preferably from 4 to 9. When n is less than 3, or when n exceeds 10, the hydrophilicity of the defoaming agent represented by the general formula (1) becomes insufficient. The antifoaming agent of the present invention may be used in combination with a known antifoaming agent such as a mineral oil, a vegetable oil, an aliphatic alcohol, a fatty acid, or an alkylene oxide adduct such as a higher alcohol, a fatty acid, or an alkylphenol. The use of the antifoaming agent of the present invention is not particularly limited. For example, paper pulp industry, paint industry, textile industry, synthetic resin industry,
Resin emulsion industry, concrete industry, food industry,
It can be used for all production and treatment steps where foaming problems are a problem, such as production and treatment steps using a large amount of water, such as human waste treatment and wastewater treatment.

In particular, when the defoaming agent of the present invention is used in combination with a deinking agent in the deinking step of waste paper, the amount of foaming in the deinking step can be effectively controlled and suppressed, and the deinking agent is removed. It has the feature that it does not hinder the black effect at all.
As the deinking agent used in combination with the defoaming agent for the deinking step of the present invention, known deinking agents, for example, alcohol alkylene oxide adducts, alkylphenol alkylene oxide adducts, fatty acid alkylene oxide adducts, alkylene oxide adducts of fats and oils, It can be used in combination with mono- or diglyceride alkylene oxide adducts, fatty acids, fatty acid metal salts, esters and the like. When the antifoaming agent of the present invention is used as an antifoaming agent for the deinking process, it is preferably 0.1 to 30% by weight, more preferably 1 to 30% by weight, based on the above deinking agent. Preferably, when added in an amount of 5 to 25% by weight, the foaming amount can be controlled and suppressed without impairing the original deinking performance of the deinking agent.

The most suitable deinking agent to be used together with the defoaming agent for the deinking step of the present invention is represented by the following general formula (2) except that the same compound as the general formula (1) is obtained. It is a nonionic deinking agent represented. _{^{R 2 O- (R 3 -O)}} m -R 4 (2) General formula (2), ^{R 2} is a hydrocarbon group or an acyl group, ^{R 4} represents a hydrogen atom, a hydrocarbon group or an acyl group . Examples of the hydrocarbon group or acyl group for R ² and R ⁴ include the same groups as those exemplified for R ¹ .

Also, R³Is an alkylene group. Archire
Examples of ethylene groups include ethylene, propylene, butylene
, Hexylene, octylene and the like. Among them,
An alkylene group having 2 to 4 carbon atoms is preferable, and an ethylene group or
Is most preferably a propylene group. (R³−
O)_mIs ethylene oxide, propylene oxide
Alkylene oxides such as side and butylene oxide
And addition polymerization of α-olefin oxide, etc.
And can be formed by: Also, (R³-O) _mof
When the moiety is two or more oxyalkylene groups,
The polymerization form such as the oxide to be polymerized is not particularly limited,
Random copolymer, block copolymer or random / block
Copolymerization or the like. (R³-O)_mAs a good
Preferably ethylene oxide and propylene oxide
Is a polyoxyalkylene group formed by copolymerization of
Is better. The polymerization degree m is a number of 1 or more.
00 is preferable, 3 to 100 is more preferable, and 10 to 8 is preferable.
0 is most preferred

The amount of the deinking composition obtained by mixing the defoaming agent of the present invention with the deinking agent is not particularly limited. It is preferably 15% by weight, more preferably 0.005 to 10% by weight, and still more preferably 0.01 to 5% by weight. As the waste paper to be deinked by the deinking treatment composition of the present invention, for example,
Newspapers, magazines, flyers, computer output paper,
Copy paper and the like are included.

The deinking composition of the present invention may contain other surfactants such as alcohol ethoxylate, alkylphenol ethoxylate, fatty acid glycol ester,
Fatty acid pentaerythritol ester, fatty acid sucrose ester, fatty acid sorbitol ester, fatty acid sorbitan ester, other polyol ester, glycerin alkylene oxide adduct, sucrose alkylene oxide adduct, sorbitol alkylene oxide adduct, sorbitan alkylene oxide adduct, alkylene alkylene Non-ionic surfactants such as oxide adducts, ethylene oxide / propylene oxide block copolymers, alkanolamides, fatty acid glycerides; alcohol sulfates, alcohol ether sulfates, alkyl sulfonates, alkylbenzene sulfonates, α-olefin sulfonates, sulfosuccinates, Anionic surfactant such as alcohol ether phosphate ; Imidazolines, tertiary or quaternary alkylammonium salts, cationic surfactants such as polydimethyl diallyl ammonium; carbobetaine,
And amphoteric surfactants such as sulfobetaine, glycine and amino acids. In addition, polymer flocculants, polymer dispersants, bleaching agents such as hydrogen peroxide and sodium hypochlorite, alkaline agents such as sodium hydroxide and potassium hydroxide, enzymes such as lipase and cellulase, sodium silicate, and carbonic acid It can be used in combination with other known additives such as sodium and a chelating agent.

[0015]

The present invention will be described more specifically with reference to the following examples. In the following examples, parts and percentages are by weight unless otherwise specified.

(Test 1) A raw material waste paper consisting of 60% offset newspaper waste paper, 20% letterpress printed waste paper, and 20% flyer waste paper is cut into 3 cm squares, a certain amount is put into a pulp disintegrator, and tap water is put in. Table 1 shows 1.3% of sodium hydroxide, 3.2% of No. 3 Keiso, 35% of hydrogen peroxide of 1.1%, and the deinking agent and 10% of the deinking agent based on the weight of the used paper. 0.3% of a deinking agent composition comprising the antifoaming agent of the present invention or a comparative product was added, and 25% at a pulp concentration of 4.0%.
Disintegrated for minutes. Next, aging was performed at 50 ° C. for 1 hour. Thereafter, the pulp concentration was diluted to 1.0% to 25%.
A flotation treatment was performed at 10 ° C. for 10 minutes, and the floss amount (foaming amount) at that time was measured. The obtained pulp was weighed at 100 g / m on a TAPPI standard paper machine.
² was obtained. Whiteness of the obtained sheet, L
The value was measured with # 80 (manufactured by Nippon Denshoku Industries). Also, the remaining ink was obtained by using the obtained pulp sheet with an image analysis device (Pierce L
A-500). These measurement results are displayed.
Shown in 1.

The deinking agent used is a compound represented by the following formula (3). _{C 17 H 35 COO (EO)} 15 / (PO) 15 -H (3)

[0018]

[Table 1]

*: The compounding amount is% by weight based on the deinking agent. (Test 2) A test was performed under the same conditions as in Test 1 except that the deinking agent was replaced with a compound of the following formula (4). Table 2 shows the measurement results. _{C 12 H 25 O (EO)} 20 / (PO) 35 -H (4)

[0020]

[Table 2]

As can be seen from the results in Tables 1 and 2, the antifoaming agent of the present invention is a PO / EO ether type of alcohol,
Any of the PO / EO ester type defatting agents of fatty acids effectively suppresses foaming while having good deinking performance, but the compound of the comparative example suppresses foaming but is inferior in deinking performance. It will be.

[0022]

The effect of the present invention is that when used together with a deinking agent in the deinking process of waste paper, the amount of foaming in the deinking process can be effectively controlled and suppressed, and the deinking of the deinking agent is performed. An object of the present invention is to provide an antifoaming agent having a feature that the effect is not inhibited at all.

Continued on the front page (72) Inventor Masaki Hosaka 7-35 Higashiogu, Arakawa-ku, Tokyo Asahi Denka Kogyo Co., Ltd. F-term (reference) 4D011 CB06 CC01 4J002 CH021 ED036 GK04 4L055 AE05 AG34 AG88 AH35

Claims (5)

[Claims] 1. The following general formula (1): R ¹ O— (C ₃ H ₆ O) _n —H (1) (wherein, R ¹ represents a hydrocarbon group or an acyl group, and n is 3 to 10) The defoamer represented by the formula: 2. The following general formula (1): R ¹ O— (C ₃ H ₆ O) _n —H (1) (wherein, R ¹ represents a hydrocarbon group or an acyl group, and n is 3 to 10) The defoaming agent for the deinking process represented by the following formula: 3. A deinking agent and the following general formula (1): R ¹ O— (C ₃ H ₆ O) _n —H (1) (wherein, R ¹ represents a hydrocarbon group or an acyl group; n represents a number of 3 to 10.) A deinking treatment composition containing a defoaming agent for a deinking step. 4. A deinking treatment composition comprising 0.1 to 30% by weight, based on the deinking agent, of an antifoaming agent for the deinking step represented by the general formula (1). 5. A deinking agent according to the following general formula (2): R ² O— (R ³ —O) _m —R ⁴ (2) (wherein, R ² represents a hydrocarbon group or an acyl group; R ³
Represents an alkylene group, R ⁴ represents a hydrogen atom, a hydrocarbon group or an acyl group, and m represents a number of 1 or more. However, the case where the compound is the same as the general formula (1) is excluded. )
The composition for deinking treatment according to claim 3 or 4, which is a compound represented by the formula: