JPS59130400A - Deinking agent used in regenerating old paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deinking agent used when recycling old paper from newspapers and magazines. More specifically, the present invention relates to a deashing agent that can obtain deinked pulp with high whiteness and a small number of residual ink when newspapers, magazines, etc. are deinked by the flotation method.

Endogenous reuse of newspapers, magazines, etc. is being carried out from old materials.Effective use of waste paper resources has become increasingly important, especially recently due to the lack of pulp rental and the soaring prices. The use of recycled paper has become more important in the United States due to the increasing emphasis on quality.On the other hand, recently, the use of waste paper has become even more difficult from the point of view of deinking due to changes in printing technology, printing methods, and changes in printing ink components. As the situation continues to change, improvements are being made to the equipment to further facilitate deinking.

Crossing agents traditionally used to separate and remove ink and other impurities from waste paper include alkali agents such as caustic soda, sodium silicate, soda carbonate, and sodium phosphate, hydrogen peroxide,
Whitening agents such as hyposulfite and cumulative hyposulfite, IEDTA,
Along with metal ion sequestering agents such as DTPA, one ion activator such as alkylbenzene sulfonate, 4N furcol #LH ester salt, α-olefin sulfonate, difurkyl sulfonate, sieving alcohol, and furkyl as a deinking agent. Non-ionic surfactants such as phenol and fatty acid ethylene oxide adducts and flucaramites are used singly or in combination of two or more. However, these deinking agents have a low ability to separate and remove ink during flotation treatment, and therefore there has been a demand for the development of a deinking agent that has excellent ink coagulation ability.

Therefore, the inventors of the present invention have excelled in the ability to remove ink from waste paper.
Furthermore, in the flotation phase, a deinking agent should be developed that can adsorb bubbles to the release ink and separate and remove them from the pulp fibers to obtain recycled pulp with high brightness (as a result of intensive research, the following general formula (1) was developed. The present invention was completed by discovering that the deinking agent contained as an essential component of the compound represented by the formula satisfies the above performance.

RCOO-f-CH20H20 amount AO±, R'
(11 [In formula (1), R is a furkyl group or alkenyl group having 7 to 21 carbon atoms, R/ is H or an alkyl group, alkenyl group or acyl group having 1 to 18 carbon atoms, and AO is C
HO, OHO or them and C2H40 and 56 4
8 mixed polyoxyalkylene group, m is 1 to 100
, n is 1-100. ] The compound of general formula (1) according to the present invention is critical,
Even if a compound is similar to this, if it does not fall under the compound of the general formula J, the remarkable effects of the present invention cannot be obtained.

Therefore, the limitations on the functional groups and numerical values shown in the general formula (1) are both unfortunate and important. As will be clarified by the comparison column below, for example, a compound consisting of an RO- group (R is the same as in formula (1)) instead of an aaoo- group, or a compound that does not contain an (AO)n group (in formula (])) =o) The compound has poor ink release properties and ink aggregation ability during flotation,
Also, RGoo(-AOsn(OH20H20-3-m
Compounds in which the order of addition of fullylene oxide is reversed, such as type H, also have significantly poor ink aggregation ability, making it impossible to obtain high-quality Yumi pulp.

(m of CH2CH2rie is an integer from 1 to 1oo, (AO
).

n is an integer from 1 to 100, preferably m is from 5 to
An integer of 50, n is 6~! IO integer, man is 1
It is preferably within the range of 0:1 to 1:2. (A.O.
) may be (Cs H60) t (c4 Ha or a mixed polyoxyalkylene group with them and (02H40). The mixed polyoxyalkylene group may be either block or random. Mixed polyoxyfulkylene , φ is at most 60 mol%, preferably at most 50 mol%.

R/ is (1) or a furkyl, fulkenyl or acyl group having 1 to 18 carbon atoms, preferably II or a furkyl group having 1 to 8 carbon atoms.

In the present invention, excellent effects can be obtained even when the compound represented by the above general formula m is used alone as a deinking agent.
Further, when used in combination with a fatty acid having 8 to 18 carbon atoms or a salt thereof, even more excellent effects can be obtained. The compounding ratio of the compound represented by the above general formula (1) and fatty acid or its salt is 9 in terms of quantitative ratio.
8:2-2:98, preferably 80:20-2o:80
It is.

Specific examples of fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, valmitic acid, stearic acid, and oleic acid. Of course, a mixture of these fatty acids may also be used.

In this case, polyvalent metal salts such as calcium chloride, magnesium chloride, magnesium hydroxide, calcium hydroxide, aluminum sulfate, etc. can also be used in combination.

The deinking agent of the present invention may be added to either the waste paper JIII decomposition process or the thermal process, and the addition amount is sufficient to be 0.2 to 0.5% by weight based on the raw waste paper. . Furthermore, the product of the present invention can also be used in combination with known deinking agents that have been commonly used. EXAMPLES The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to these Examples.

Example-1 After shredding waste newspaper recovered in cloth into 2 x 5 spades, put a certain amount of it into a tabletop separator and add water and caustic soda (for raw materials) 1
．． 0%, sodium silicate No. 3 [based on raw materials] 2.5%, 30% hydrogen peroxide 6.0%, deinking agent (based on raw materials) 0.3% added, pulp roughness 5%, 45°C, 20 After decomposition, the mixture was aged at 45° C. for 60 minutes. The drained water was added to dilute the pulp to a concentration of 1.0%, and a flotation treatment was performed at 30° C. for 10 minutes. The pulp slurry after flotation was diluted to a concentration of 1% by adding condensation water to a concentration of 6%, and a valve seat was produced using a Kutsbee sheet machine. The whiteness of the obtained valve sheet was measured using a colorimeter and the number of remaining ink was measured using a face recognition analyzer (X 126 f&). The results are shown in Table-1.

Example-2 After shredding 12 x 5 aaK waste paper recovered in cloth, put a certain amount of it into a high-concentration pulper, and add water and 1.5% caustic soda into it.
, silicate powder (No. 5 96.0%, 30% hydrogen peroxide 3.
0%, deinking agent 0.3% (all based on the raw material), pulp concentration 15%, 45℃, 20 separation treatment. After that, water was added to this to dilute the pulp concentration 4%, and then further Water was added to make the pulp concentration 1.0%. This was subjected to a flotation treatment at 30°C for 10 minutes. After the pulp slurry after flodation was concentrated to a concentration of 6%, water was added to bring the pulp concentration to 1%. It was diluted and a valve seat was produced using a Tarabee sheet machine.

The whiteness of the obtained valve sheet was measured using a colorimeter and the number of remaining ink was measured using an image analyzer (X12 (5). Table 2 shows the results.

Procedural amendment (spontaneous) 1 Indication of the case Japanese Patent Application No. 58-5455 2 Name of the invention Deinking agent for waste paper recycling 3 Person making the amendment Relationship to the case Patent applicant (0911 Kao Soap Co., Ltd. 4 Agent specification Claims and Detailed Description of the Invention 1- [Table-1 2- (1) Table-2 on page 10 of the same is amended as follows 1
Table-2, Claim 1 General formula (1) % Formula % (1) [In formula (1), R is an alkyl group or alkenyl group having 7 to 21 carbon atoms, and R' is H or a carbon number 1 to 18 alkyl group, alkenyl group or acyl group, AO is O, H6
0, O, HI! O or a mixed polyoxyalkylene group of them and 02H, O, m is 1 to 1001, n is 1
~100. ] A deinking agent for waste paper recycling, characterized by containing a compound represented by the following as an essential component.

Claims (1)

[Claims] 1 General formula (1) % formula % [In formula (1), R is an alkyl group or alkenyl group having 7 to 21 carbon atoms, R' is H or an alkyl group having 1 to 18 carbon atoms, It is an alkenyl group or an acyl group, and AO is C3H6
0, G4H3O or a mixed polyoxyalkylene group of these and C2H40, and m is 1 to 100. n is 1-1
It is 00. ] ff: A deinking agent for waste paper recycling characterized by containing a compound represented by the following as an essential component.