JPS61207686A - Deinking of 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 [Field of Industrial Application] The present invention relates to a deinking agent used when recycling used paper such as newspapers and magazines. More specifically, the present invention relates to a deinking agent capable of producing deinked pulp with high whiteness and a small number of residual ink when deinking newspapers, magazines, etc. by a rough 0-chillion method or a 70-chillion/washing mixed method.

[Conventional technology and its problems]

Recycling of newspapers, magazines, etc. has been practiced for a long time, but recently, the effective use of waste paper resources has become increasingly important due to the shortage of pulp resources and the soaring prices. There is also an increasing demand for advanced use of carbon fibers.

Recycling of used paper also has many advantages from the viewpoint of energy conservation, urban waste management, forest resource preservation, etc. On the other hand, recently, the situation with used paper has become even more difficult from the viewpoint of deinking due to changes in printing technology and printing methods, changes in printing ink components, etc. Improvements have also been made to the equipment.

Chemicals traditionally used to decompose and remove ink and other impurities from waste paper include alkaline agents such as sodium hydroxide, sodium silicate, sodium carbonate, and sodium phosphate, hydrogen peroxide, hyposulfite, and hypochlorite. Bleaching agents such as acid salts, EDTA.

These are metal ion sequestering agents such as DTPA, NTA, and 5TPP, and conventionally known chemical substances used as deinking agents for waste paper recycling along with these are alkylbenzene sulfonates, alkyl sulfates, α-olefin sulfonates, dialkyl sulfosuccinates, Anionic surfactants such as higher fatty acid salts, higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, fatty acid amide ethylene oxide adducts, polyglobylene glycol ethylene oxide adducts, ethylene in fats and oils Examples include nonionic surfactants such as oxide adducts, higher alcohol ethylene oxide propylene oxide (block or random) adducts, and amphoteric ionic surfactants such as amine oxides and alkyl betaines. It is also a known fact that the effects can be increased by using these chemical substances in combination with specific organic/inorganic builders, organic solvents, etc. However, these chemical substances and their combinations do not necessarily have a high cleavage efficiency in the flotation process, and do not necessarily satisfy the requirements for obtaining recycled paper with high whiteness and a low number of residual inks. It's not something that can be done.

For example, fats and their salts that have excellent ink-collecting acidity in the flotation process have a drawback that their foaming properties are very low at about 70 degrees, and the removal of coagulated and floated ink is not sufficient. ing. In addition, although the conventionally known deinking surfactants described above have sufficient ink removal properties from paper in the waste paper disintegration process and foaming properties in the 70-station process, they have weak ink collection properties, and do not form on the foam layer. This method has the disadvantage that the amount of ink present in the foam layer is small and that it is difficult to remove the ink floating in the valve suspension from the system together with the foam layer. In this way, no chemical substance has been found that has all of the properties of removing ink from paper in the waste paper disintegration process, high foaming property and high ink collection property in the flotation process, and certain chemical substances A common method is to use a formulation of However, although a deinking method using this compound has some effect, it is not necessarily a satisfactory method.

[Means for solving problems]

Therefore, the present inventors conducted extensive research to find a deinking agent that does not have the above-mentioned drawbacks, and as a result, they found that a compound represented by the following general formula (1) satisfies this requirement, and completed the present invention.

That is, the present invention provides a deinking agent for regenerating old licks, which contains a compound represented by the following general formula (υ) as an essential component.

(In formula (1), R represents an alkyl, alknyl, or hydroxyalkyl group having 8 to 24 carbon atoms, and M and M2 each represent hydrogen, an alkali metal, an alkaline earth metal, ammonium, or an organic base.) The compound represented by the general formula (11) of the invention can be produced by any method, for example, by directly sulfonating a fatty acid and then neutralizing it, or by sulfonating a fatty acid alkyl ester. After that, there is a method of hydrolyzing with alkali. For example, palm kernel oil fatty acid methyl ester is heated to 70-90C and an appropriate amount of SO3 gas is added.
, a method of directly introducing sulfonation under stirring for 50 to 60 minutes, followed by hydrolysis with an alkali after the sulfonation reaction.

When producing the compound of general formula (1) of the present invention from a fatty acid, examples of the fatty acid used include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid. can. Of course, a mixture of these fatty acids may also be used. Furthermore, when a fatty acid alkyl ester is used as a starting material, the above-mentioned fatty acid methyl ester, ethyl ester, flobyl ester, and butyl ester are preferred.

In the present invention, the compound represented by the above general formula (11) has both excellent ink cohesiveness and foaming property that conventionally known compounds could not have, and even when used alone, it has an excellent deinking effect. can get.

Further, when the compound represented by the above general formula (1) is used in combination with an ethylene oxide/propylene oxide copolymer such as a higher alcohol or a fatty acid, an even more excellent deinking effect can be obtained. The blending ratio is 5=95 to 70 by weight:
50 is preferable, more preferably 1; jlo: 90-50
:50.

Specific examples of ethylene oxide/propylene oxide copolymers such as higher alcohols or fatty acids include oEo-p such as lauryl alcohol, stearyl alcohol, and oleyl alcohol.

Addenda, 4! Examples include compounds described in JP-A-59-130400.

The deinking agent of the present invention is preferably added in the waste paper disintegration process, and the amount added is sufficient in the range of 0.2 to 0.8% by weight based on the raw waste paper. Further, the present invention can also be used in conjunction with a known deinking agent that has been commonly used.

〔Example〕

The 8J4 of the present invention will be specifically explained below with reference to Examples, but the EiA of the present invention is not limited to these Examples.

The deinking performance was evaluated using the whiteness of the recycled valve seat (SM Color Computer 5M- manufactured by Suga Test Instruments Co., Ltd.).
A method of measuring the number of remaining inks (using a LUZEXSC1O image resolution analyzer manufactured by Nippon Regulator Co., Ltd.) and measuring the number of remaining inks (using a LUZEXSC10 image resolution analyzer manufactured by Nippon Regulator Co., Ltd.) was used.

Example 1 After shredding waste newspaper recovered in cloth into 2 x 5 crn pieces, put a certain amount of it into a tabletop disintegrator, and add water, sodium hydroxide (used paper raw material), 5%, and sodium silicate No. 3 into it. (For used paper raw materials) 4.5%, 30% hydrogen peroxide solution (For used paper raw materials)
1.0%, deinking agent shown in Table 1 (for waste paper raw material) 0.48
% was added, the pulp concentration was 5%, and the mixture was disintegrated at 60C for 15 minutes, and then aged at 45C for 90 minutes. Thereafter, water was added to dilute the pulp to a concentration of 1.0%, and the mixture was subjected to a flotation treatment at 50C for 10 minutes. After the pulp slurry after flotation was concentrated to a concentration of 6%, water was added to dilute it to a concentration of 1%, and a valve sheet was prepared using a TAPPI sheet machine.

Incidentally, an alkaline hydrolyzate of α-sulfofatty acid alkyl ester (α-sulfofatty acid disodium salt) Fi was obtained by the following method. An aqueous solution prepared by preparing α-sulfonated hardened balm kernel oil fatty acid methyl ester Na fi5011 and 10 times molar equivalent of sodium hydroxide with tap water (2.6”dH) to a total volume of 1040m was prepared by approximately IC/2mfn.
The temperature was increased to 70C under the conditions of a temperature increase rate of about 2000 rpm and a stirring rate of about 2000 rpm. After cooling to room temperature, the alkaline hydrolysis rate of the ester was determined by titration, and the hydrolysis rate was found to be close to 100%. This titration method involves taking a fixed amount of a sample containing an alkaline hydrolyzate,
After acid titration, perform back titration with alkali to find the first inflection point,
This is a method of finding the second inflection point.

Table 1 shows the evaluation results of deinking properties.

Example 2 After shredding waste paper recovered in cloth into t2x5IM, put a certain amount of it into a high-concentration pulper, and add water and sodium hydroxide (
(raw material for used paper) 1.5%, sodium silicate No. 3 (raw material for waste paper) 3.0%, 30% hydrogen peroxide solution (raw material for waste paper) 3
．． After adding 0% and 065% of the deinking agent shown in Table 2 (for raw waste paper) and disintegrating at 45G for 20 minutes at a pulp concentration of 15%,
Aged at 60C for 60 minutes. The drained water was added to dilute the pulp to a concentration of 1.0%, and the pulp was subjected to a 70°C treatment at 40C for 10 minutes. Pulp slurry after flotation is diluted to 1% concentration by adding water after 6% concentration*a and TA
A valve seat was produced using a PPI sheet machine.

Table 2 shows the evaluation results of deinking properties.

Claims (1)

[Claims] 1. General formula (1) ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (1) (In the formula, R represents an alkyl, alkenyl or hydroxyalkyl group having 8 to 24 carbon atoms, and M_1 and M_2
each represents hydrogen, an alkali metal, an alkaline earth metal, ammonium or an organic base. ) A deinking agent for waste paper recycling that contains the compound represented by the following as an essential ingredient.