JPS61266688A - Deinking aid for 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] (Industrial application field) The present invention relates to a deinking aid. For more details.

High whiteness, suitable for deinking newspapers, magazines, etc.

The present invention also relates to a deinking aid for waste paper recycling, which is used together with a deinking agent in order to obtain deinked pulp with a small number of residual inks.

(Conventional technology and problems) Recycling of newspapers, magazines, etc. has been carried out for a long time, but recently, due to the shortage of pulp resources and the soaring price, the effective use of waste paper has become more valuable. In addition, the use of deinked pulp is also expanding to other uses. On the other hand, in recent years, the situation with waste paper has become even more precarious in terms of deinking, including changes in printing technology, printing methods, changes in printing ink components, and the use of waste paper that was not previously collected and reused. Improvements have also been made to the equipment to facilitate deinking. Caustic soda is a chemical traditionally used to separate and remove ink and other impurities from waste paper.

Alkaline agents such as sodium silicate, sodium carbonate, and sodium phosphate; bleaching agents such as hydrogen peroxide primary sulfite and hypochlorite;
EDTA, D'rPA#! along with sequestering agents of
As a deinking agent, anionic activator such as alkylbenzene sulfonate, higher alcohol sulfate ester salt, a-olefin sulfonate, dialkyl sulfotecinate,
KO of higher alcohols, alkylphenols and fatty acids
Nonionic surfactants such as (ethylene oxide) adducts, EO-PO (propylene oxide) adducts, and alkanolamides have been used singly or in combination of two or more.

However, it is difficult to completely separate ink from waste paper, and as the use of deinked pulp has expanded and the blending ratio has increased recently, the presence of ink that has not separated from waste paper, that is, unreleased ink, has become a problem. It's getting better.

(Means for solving the problem) As a result of intensive research to improve this point, the present inventors found that by using the deinking aid of the present invention in combination with the conventionally used deinking agent, , high white color.

They discovered that it is possible to obtain deinked pulp with a high degree of ink retention and a low number of residual ink, and completed the present invention.

That is, 1 the present invention is a type A zeolite (however, R□0ΦA/
Represented by 0.1.8~2.2 SiO□φ7H2O,
R is an exchangeable cation, n is its predetermined value, and y is a numerical value from 0 to 10).

The average particle diameter of the AJI zeolite of the present invention is 1 to 100μ
m is preferable, and 5 to 50 μm is more preferable. As an exchangeable cation.

Examples include alkali metals such as Na and Ni, alkaline earth metals such as Oa, and ammonium.

Furthermore, any method for producing the A-type zeolite according to the present invention may be used without any particular limitations.

For example, using a sodium silicate water bath solution and a sodium aluminate water bath solution as starting materials, Na2O, A/2O. .

5i02* Each component of R2O is mixed in a predetermined ratio to form an aluminosilicate alkali gel, and heated and aged to precipitate zeolite crystals. Furthermore, if necessary, the cation is exchanged with another cation. Acidic clay.

There is also a method using clay minerals (for example, kaolin) as a starting material, and there are various other methods.

The deinking aid of the present invention is used in combination with conventionally known deinking agents. The known deinking agent may be an anionic surfactant or a nonionic surfactant, or a mixture thereof.

Examples of anionic surfactants include alkylbenzene sulfonates, alkyl sulfates, polyoxyalkylene alkyl (or alkylaryl) sulfates, alkanesulfonates, α-olefin sulfonates, dialkyl sulfosuccinates, higher fatty acid salts, Examples include alkyl ether carboxylates. Examples of nonionic surfactants include higher alcohols, alkylphenols, and fatty acids (7)K.
O adduct, 7JO# with go-po, higher fatty acid amide,
Examples include amine oxide.

The amount of the deinking aid of the present invention to be used is preferably 0.5 to 20%, more preferably 1S10%, based on the raw material waste paper or pulp.

The deinking aid of the present invention is used in the waste paper m% process or.

It is best to add it to a process that involves a large physical effect, or the addition process may be separated. Further, although the deinking aid of the present invention is usually used together with the deinking agent, the addition steps do not necessarily have to be simultaneous.

(Function) The deinking aid of the present invention has synergistic effects such as its own builder effect, cation exchange ability and adsorption ability, as well as the promotion of cellulose shearing force due to physical frictional force due to its crystal structure and morphology. It is presumed that deinked pulp gold with high whiteness and a low number of remaining inks can be obtained by the overall effect of the action, the release agent, and the synergistic effect with the concomitant chemicals.

(Examples) Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

Example-1 After cutting waste newspaper recovered in cloth into 2 x 51) liters, a certain amount of it was placed in a tabletop disintegrator, and water, caustic soda (based on raw material) 1.0%, and sodium silicate (based on raw material) 2% were added thereto. .5%, 30%
Hydrogen peroxide (based on raw materials) 5.0%, deinking agent (based on raw materials) 0.
After adding 3% and further adding 1.0% of deinking aid (relative to the raw material), the pulp concentration was 5%, and after 2O separation and decomposition at 55°C, 50%
It was aged for 60 minutes at ℃. The drained water was added to dilute the pulp to a pulp concentration of t-1.0%, OaC/2 i 1.0% mulberry was added, and the mixture was subjected to a flotation treatment at 30° C. for 10 minutes.

Pulp slap after Flochee John! J-1-After concentrating to 6% concentration, add water to dilute to 1% concentration, and TAPPI
A valve seat was produced using a sheet machine. The whiteness of the obtained valve sheet was measured using a colorimeter and the number of remaining unpeeled inks was measured using an image analyzer (100x magnification). The results are shown in Table 1.

Example-2 After cutting waste newspaper recovered in cloth into 2 x 5 pieces, put the lid into a tabletop disintegrator, and add water, 1.0% caustic soda (based on raw materials), and sodium silicate (based on raw materials). Raw materials) 2.5%, 30%
Hydrogen peroxide (based on raw materials) 5.0%, deinking agent (based on raw materials) 0.
After adding 3% of the deinking aid and further adding 10.0% of the deinking aid (based on the raw material), 2O was separated and decomposed at 55°C at a pulp concentration of 4%, and then aged at 50°C for 90 minutes. Add the drained water to dilute the pulp concentration to 1.0%, and add 0asis2 to 1.0%.
Add vinegar and apply flotation treatment at 30°C for 10 minutes. After the pulp slurry after flotation was concentrated to a total concentration of 6%, water was added to dilute it to a concentration of 1%, and TAPPI
A valve seat was produced using a sheet machine. The whiteness of the obtained valve sheet was measured using a colorimetric colorimeter, and several tones of residual unpeeled ink were measured using an image analyzer (Xl 00x). The results are shown in Table 2.

Claims (1)

[Claims] 1. A-type zeolite (However, R_2_/_nO・Al_
It is represented by 2O_3・1.8~2.2SiO_2・yH_2O, where R is an exchangeable cation, n is its valence, and y is 0.
A deinking aid for waste paper recycling, which has a numerical value of ~10.