JPS62185002A - Slime-controlling agent for paper-making - Google Patents

Abstract

PURPOSE:To provide the titled controlling agent containing a specific halogen- containing acetophenone compound as an active component, exhibiting excellent antibacterial activity and effective in controlling slime in process water in the paper-making industry. CONSTITUTION:The objective agent contains a compound of formula (X is F, Cl or Br; m and n are 1 or 2), e.g. alpha-bromo-2-bromoacetophenone, alpha,alpha- dibromo-4-fluoroacetophenone, etc., as an active component. The compound of formula can be easily produced e.g. by brominating methyl halogenophenyl ketone with Br2 in an inert solvent such as CCl4. The compound is used in the form of solution or suspension by dissolving in a solvent such as dimethylsulfoxide, xylene, etc., or suspended in water as fine particles. Sufficient effect can be attained by adding the controlling agent to the process water for paper-making at a concentration of 0.1-100ppm in terms of the active component.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agent for controlling slime in industrial water in a paper manufacturing process.

Slime is formed by the growth of microorganisms such as bacteria, yeast, and filamentous fungi during the pulp preparation and papermaking processes of pulp and paper mills.

It is known to cause various disorders.

Slime is a riffler wall, screen, inlet or chest wall, white water bit during the paper making process.

K adheres to almost every part of the process that uses water, such as the inner walls of recovered white water pipes, and gradually increases in thickness, and eventually peels off and mixes into the pulp slurry or clogs screens and pipes. Small slime lumps mixed into the pulp slurry cause yellow or brown spots, so-called eyeballs, on the paper, degrading the paper quality, while large slime lumps cause paper breakage.

In recent years, there has been an increase in pitch-like deposits due to improved white water recovery rates, eutrophication due to additives such as starch and polyacrylamide, deposits containing inorganic fillers, resin components of wood, adhesives derived from waste paper, etc. As a result, the paper manufacturing process has become an environment suitable for the growth of microorganisms. In particular, improvement in the white water recovery rate is a cause of the appearance of bacteria resistant to slime control agents and a decrease in the efficacy of slime control agents. Many slime control agents have been developed and used in the past.

At present, none of these slime control agents is capable of maintaining sufficient efficacy under such conditions.

As a result of research into slime control agents, the present inventors discovered that acetophenone compounds having a specific halogen atom have excellent antibacterial activity and are extremely effective in controlling slime.

The present invention is based on the general formula (In the formula, or a fluorine atom, a chlorine atom or a bromine atom.

This is a papermaking slime control agent characterized by containing a compound represented by (m and n represent the numbers 1 or 2) as an active ingredient.

Examples of the compound of general formula (1) include the following compounds. α-bromo-2-chloroacetophenone, α-promo 4-chloroacetophenone, α, α-dibromo 2-chloroacetophenone, α, α-dibromo 4-chloroacetophenone, α-promo 2-bromoacetophenone, α-promo 3- Bromoacetophenone, α-
Bromo-4-bromoacetophenone, α,α-sifromo-2-bromoacetophenone, α,α-dibromo-3-
Bromoacetophenone, α, α-dipromo-4-bromoacetophenone, α-bromo-2-fluoroacetophenone, α-bromo-6-fluoroacetophenone, α-
promo 4-fluoroacetophenone, α,α-dibromo 2-fluoroacetophenone, α,α-dibromo 3-fluoroacetophenone, α,α-dibromo 4-
Fluoroacetophenone, α-promo 2,4-dichloroacetophenone, α,α-dibromo 3,4-dichloroacetophenone, etc.

The compound of formula (1) can be easily prepared by brominating 1, for example, methyl S, (halogenophenyl)\ketone, with bromine in an inert solvent, such as carbon tetrachloride.

The slime control agent of the present invention is usually used in the form of a solution or suspension by dissolving the compound of formula I in a solvent or by suspending it in water in the form of fine particles. As the solvent, alcohol, ketone, glycol, polyethylene glycol, glycol ether, glycol ester, dimethyl sulfoxide, dimethyl formamide, benzene, toluene, xylene, 1,1.1-)IJ chloroethane, etc. are used.

The slime control agent of the present invention may contain two or more types of compounds of formula (1), and may also contain other microbial inhibitors. Examples of other microbial inhibitors include the following compounds.

2-Methyl-5-chloro-4-inchazolin-6-one and its metal complex salts, pentwinthiazolin-6-one, 4.5--)/clodithiol-3-one, methylenebisthiocyanate, bisbromoacetoxy Butene, bisbromoacetoxyethane, 2-bromo-2-nitropropanediol-1,3,3-bromo-6-nitropentanediol-2,4.1.1-dibromo-1-nitroethanol-2, S, S, 4,4-tetrachlorotetrahydrothiophene-1,1-dioxide, 2,2-sifukumo-6-nitrilobropionylamide, etc. Furthermore, the formulation may contain dispersion aids such as surfactants and thickeners such as xanthan gum.

The amount of the slime control agent of the present invention added to the papermaking process varies depending on the water source, papermaking material, etc., but generally it is sufficiently effective at 0.1 to 100 ppm of the active ingredient in the water.

The compositions of the formulation examples and comparative examples are as follows.

Formulation example 1 α-bromo-4-chloroacetophenone 20 parts Dimethylformamide 80 parts Formulation example 2 α, α-dibromo-4-chloroacetophenone 20 parts Diethylene glycol monomethyl ether 80 parts Formulation example 6 α-bromo-2-bromoacetophenone 20 parts Dimethyl sulfoxide 60 parts diethylene glycol monomethyl ether 50 parts Formulation example 4 α,α-sifuromo-4-bromoacetophenone 20 parts Methoxypolyethylene glycol 755 parts Nirasannonion NS-21 (manufactured by NOF Corporation) 5 parts Formulation example 5 α-bromo-4 -Fluoroacetophenone 20 parts (ethylene glycol diacetate) 80 parts Formulation example 6 α, α-dibromo 4-fluoroacetophene 20 parts Non-xylene 755 parts Nirasannonion NS-2045 parts (manufactured by NOF Corporation) Formulation example 7 α, α -Dibromo-6,4-dichloroaceto 20 parts Phenone dimethylformamide 55 parts Diethylene glycol 25 parts Comparative example 1 Hexabromodimethyl sulfone 20 parts Dimethyl sulfoxide 80 parts Comparative example 2 Bisbromoacetoxybutene 20 parts Diethylene glycol monomethyl ether 755 parts Nirasan nonion NS -21 (manufactured by E1 Hon Yushisha Co., Ltd.) 5 parts Comparative Example 3 Penzinthiazolin-6-one 20 parts Dimethylformamide 80 parts Example 1 Slime collected from the stock inlet during the cardboard center paper manufacturing process was precultured in Waxman liquid medium. This was used as a test bacterial solution. Shake 5 flasks with 100 mg capacity and add 50 liters of sterile water.
rnl, Waxman liquid medium 10mA! Then, 1 TrL of the test bacterial solution was added to the culture solution, and 1 slime control agent of the present invention and a comparative drug were added to the culture solution to give a concentration of 10.20 ppm and SO ppm.

Culture was performed at 37°C with shaking. The absorbance of this culture solution at 660 nm was measured over time, and the degree of inhibition of slime-forming bacteria propagation was compared. The results are shown in Table 1. The suppression time in the table is the time until the absorbance of each culture solution reaches 0.1, and the stronger the potency, the longer the suppression time.

Table 1 Example 2 A stainless steel water tank with a diameter of 30 crn and a depth of 30 σ was equipped with a temperature control device, a stirrer, a thermometer, and a slime measuring plate with a width of 5 crn, a length of 30 crn, and a thickness of 1.5 cr.
Two pieces of n lauan wood were attached vertically.

1% pulp in Waxman liquid medium diluted 1000 times
and white water culture solution (culture solution obtained by culturing white water collected from the paper manufacturing process in Waxman liquid medium) at 0.1111/If
) ratio, and then artificial white water adjusted to pH 5 with aluminum sulfate.

This tank was fed at a flow rate of 217 hours and the same amount of artificial white water was discharged. Slime control agent is 10p for artificial white water.
The solution was added using a pump 6 times a day for 3 hours at a time so that the concentration was 100 pm. Stirring was continued while keeping the white water temperature at 60°C, and the slime control effect was evaluated after about 10 days. Two types of white water were used for the white water culture solution: white water (A) collected from the papermaking process centered on one corrugated board and white water (B) collected from the newsprint papermaking process.

For evaluation, the slime measuring plate was visually observed and the amount of slime attached was scored using a 10-point scale. The outline of the scoring criteria is as follows.

0: No slime adhesion observed at all.

5 Ni slime is thinly attached to the entire surface.

10 Ni slime is thickly adhered to the entire surface, and some parts have peeled off.

Since the amount of slime attached differs from test to test depending on the white water used and other conditions, this is a relative and comprehensive evaluation of the results with no slime control agent added and with comparative agents. The results are shown in Table 2.

Table 2 Applicant: Permakem Asia Co., Ltd. Agent: Patent attorney Masao Ko Hayashi 1 other person

Claims (1)

[Claims] General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (I) (In the formula, X is a fluorine atom, a chlorine atom, or a bromine atom, m and n
indicates a number of 1 or 2) as an active ingredient.