JP3177862B2 - Slime control agent for papermaking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slime control agent for industrial water in a papermaking process.

[0002]

2. Description of the Related Art It is known that in the pulp preparation and paper making processes of pulp mills and paper mills, slime is formed by propagation of microorganisms such as bacteria, yeasts and filamentous fungi, causing various obstacles. The slime adheres to almost every part of the papermaking process that uses water, such as the ruffler walls, screens, inlet or chest walls, white water pits, and the inner walls of the recovered white water pipes, and gradually increases in thickness and eventually peels off. To mix into pulp slurry or clog screens and pipes. The small slime mass mixed in the pulp slurry causes yellow or brown spots on the paper, so-called eyeballs, lowering the paper quality,
Large slime lumps cause the paper to run out.

In recent years, improvement in white water recovery rate, eutrophication with additives such as starch and polyacrylamide, sediments containing inorganic fillers, resin components of wood, pitch-like sediments due to adhesives derived from waste paper, etc. As a result, the papermaking process has become an environment more suitable for the propagation of microorganisms. In particular, an improvement in the recovery rate of white water makes it easy to cause emergence of bacteria resistant to the slime control agent and a bacterial replacement phenomenon, which causes a reduction in the efficacy of the slime control agent.

[0004]

For this reason, many slime control agents have been developed and used in the past, but no slime control agent capable of maintaining satisfactory efficacy under such conditions has been found at present. It is.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies and found that α-chloro-4-chlorobenzaldoxy.
The present invention was found to have excellent efficacy as a slime control agent for papermaking, and completed the present invention. α-chloro-4-chloro
Robenzaldoxime is 4-chlorobenzaldoxy
Arm water or chlorinated solvents such as chloroform, methylene chloride, carbon tetrachloride, using ethylene chloride and the like, can be chlorinated produced by the chlorine gas.

[0006] The papermaking slime control agent of the present invention comprises α-
Loro-4-chlorobenzaldoxime is dissolved in a solvent or made into fine particles and suspended in water to be used as a suspending agent. Examples of the solvent include alcohols such as methanol and ethanol, glycols such as ethylene glycol, diethylene glycol, diethylene glycol monomethyl ether, ethyl cellosolve, and polyethylene glycol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethyl acetate, butyl acetate, and adipine. Esters such as ethyl acid and ethyl lactate, dimethylacetamide, dimethylformamide, dimethylsulfoxide, dioxane and the like are used.

[0007] Auxiliary agents such as surfactants and other slime controlling agents may be added to the preparation. In order to produce a suspending agent, it is finely pulverized using a ball mill or the like and suspended in water, but it is possible to use a thickener such as xanthan gum as a stabilizer and a nonionic, anionic or cationic surfactant as a dispersant. it can. The addition amount of the slime controlling agent of the present invention in the papermaking process varies depending on the water source, the paper, and the like, but generally 0.1 to 100 ppm, preferably 0.5 to 50 ppm, as the active ingredient is sufficient for the water.

[0008]

EXAMPLES The formulations of the formulation examples are as follows. The parts in the preparation examples mean parts by weight. Formulation Example 1 (Solution) α-chloro-4-chlorobenzaldoxime 10 parts Dimethylacetamide 90 parts Formulation Example 2. (Solution) α-chloro-4-chlorobenzaldoxime 10 parts Dimethylacetamide 55 parts Xylene 32 parts Nonion NS-204.5 3 parts Formulation Example 3. (Solution) α-chloro-4-chlorobenzaldoxime 10 parts Dimethylacetamide 50 parts Diethylene glycol monomethyl ether 38 parts Nonion NS-204.5 2 parts

Formulation Example 4. (Solution) α-chloro-4-chlorobenzaldoxime 10 parts Dimethylformamide 90 parts Formulation Example 5. (Solution) α-chloro-4-chlorobenzaldoxime 10 parts Dimethylformamide 55 parts Ethyl lactate 32 parts Nonionic NS-204.5 3 parts Formulation Example 6. (Suspension) α-chloro-4-chlorobenzaldoxime 10 parts Xanthan gum 0.3 parts Emulgen A-90 (Nonionic surfactant manufactured by Kao Corporation) 2 parts Water 87.7 parts

Test Example 1 Slime collected from the stock inlet during the cardboard-centered papermaking process was pre-cultured in a waxman liquid medium to obtain a test bacterial solution. 50 sterile water in a 100 ml shake flask
ml, Waxman liquid medium 10 ml and test bacterial solution 10
m1, and the reagents were added to the culture at 5, 20, and 5
0 ppm (0.5, 2 and 5 ppm as test compounds)
And cultured with shaking at 37 ° C. The absorbance at 660 nm of this culture was measured over time to compare the degree of inhibition of slime-forming bacteria propagation. Table 1 shows the results. In the suppression time in the table, the absorbance of each culture solution was 0.1
, And the stronger the effect, the longer the suppression time. The prescription preparations shown in Preparation Examples were used as the reagents. The formulation of the comparative example in the table is as follows. Comparative Example 1 Methylene bisthiocyanate 10 parts Polyethylene glycol # 200 90 parts Comparative example 2 2,2-dibromo-2-nitrylopionamide 10 parts Diethylene glycol monomethyl ether 90 parts

[0011]

[Table 1]

Test Example 2 In a stainless steel water tank having a diameter of 30 cm and a depth of 30 cm, two lauan materials having a width of 5 cm, a length of 30 cm and a thickness of 1.5 cm were used as a temperature controller, a stirrer, a thermometer and a slime measuring plate. Mounted vertically. After adding 1% of pulp and a white water culture solution (a culture solution of white water collected from a newsprint papermaking process in a waxman liquid medium) at a ratio of 0.1 ml / liter to a 1000-fold diluted Waxman liquid medium, sulfuric acid was added. Artificial white water adjusted to pH 5 with aluminum was supplied to this tank at a flow rate of 2 liter / hour, and the same amount of artificial white water was discharged. The reagent was added by a pump three times a day and three times a day for 3 hours to the artificial white water supplied. The white water temperature was kept at 30 ° C., and stirring was continued. After about 10 days, the slime control effect was evaluated. The white water used in the white water culture solution was white water collected from the cardboard center papermaking process (A).
And white water (B) collected from the newspaper papermaking process.

For evaluation, the slime measuring plate was visually observed, and the amount of slime adhered was scored by a 10-point method. The outline of the scoring standard is as follows. 0: No slime was adhered at all. 5: Slime adheres thinly on the entire surface. 10: Slime is thickly attached to the entire surface and partly peeled off. Since the amount of slime adhered to each test varies depending on the white water used and other conditions, it is a relative and comprehensive evaluation with no slime control agent added and a comparative agent. Table 2 shows the results. As the reagent agent, a preparation having the formulation shown in Preparation Examples was used. Table 2 shows the test results. The formulation of the comparative example in the table is the same as that of Test Example 1.

[0014]

[Table 2]

Test Example 3 300 ml of white water collected from the corrugated papermaking process was placed in an Erlenmeyer flask, and the reagents were added to the white water in an amount of 5, 20,
50 ppm (0.5, 2, 5 p
pm). After stoppering with a paper stopper and shaking culture at 32 ° C. for 1 hour, the number of viable bacteria is measured. At the same time, a culture solution without drug is also tested, and the bactericidal activity is compared based on the degree of decrease in the number of viable bacteria due to the drug addition. As the reagent agent, a preparation having the formulation shown in Preparation Examples was used. Table 3 shows the test results. The formulation of the comparative example in the table is the same as that of Test Example 1.

[0016]

[Table 3]

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Fukuda 2-14-5 Hiranuma, Nishi-ku, Yokohama-shi, Kanagawa Prefecture Within Permachem Asia Co., Ltd. (72) Michio Watanabe 2- 14-5 Hiranuma, Nishi-ku, Yokohama-shi, Kanagawa Prefecture No. Permachem Asia Co., Ltd. (72) Inventor Norio Yoshida 2-14-5 Hiranuma, Nishi-ku, Yokohama-shi, Kanagawa Prefecture Permachem Asia Co., Ltd. (56) References JP-A-5-70306 (JP, A) 48-92527 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D21H 21/04 A01N 35/10

Claims (1)

(57) [Claims] (1) α-chloro-4-chlorobenzaldoki
A slime controlling agent for papermaking, comprising a shim as an active ingredient.