JPS6017878B2 - Felt cleaning agent for papermaking - Google Patents

Description

[Detailed description of the invention] The present invention relates to a felt cleaning agent for papermaking.

More specifically, the present invention relates to a papermaking felt cleaning agent that cleans papermaking felts used in the pulp and paper industry, maintains uniform water extraction properties, and extends the life of the felts. The paper manufacturing process consists of steps such as valve preparation, paper making, dehydration, and drying.

Focusing on the dehydration process, although most of the water is removed from the paper-made wet paper in the plowing section, it still contains a lot of water, and if this is immediately heated and dried, it will require a lot of steam. The fibers are not sufficiently intertwined, so it is difficult to obtain paper with high strength. Therefore, the wet paper from the sieve is further mechanically pressed and dehydrated before being led to the drying section. This device is called a press section, and the press section consists of a press roll consisting of two stages of upper and lower rolls, and a felt for conveying the wet paper.The wet paper is placed on the felt and guided, and both are passed between the rolls and pressed. and dehydrated. Generally, dewatering in a press depends on various factors, one of which is the water squeezing ability of the press felt. When dirt adheres to the felt and causes clogging, even water extraction is inhibited and various troubles occur. For example, paper breakage in the pressing process, occurrence of defective products, increase in steam in the drying process, increase in draw adjustment, etc. Therefore, it is important to keep the felt clean at all times in order to increase papermaking efficiency. For this reason, various surfactants are used as felt cleaning agents.

In recent years, structural changes have been occurring in the paper pipe industry in terms of raw material procurement, and there has been a significant increase in the consumption of waste paper and the amount of hardwood used.

Along with this, the quality of dirt that gets into the papermaking process has also changed significantly. In the pulp recycled from waste paper, there are carbon that has not been completely removed and pitch from the grand valve. Hardwood materials contain more resin and resin than softwood materials.
Contains a lot of oils and fats. Such stains are increasing, and furthermore, paper making speeds are increasing, making it difficult to maintain felt in a satisfactory condition using conventionally known cleaning agents. In addition to insufficient detergency, conventionally known detergents have a large foaming property, which often causes foaming problems during the papermaking process. For example, poor formation, quality deterioration due to color and pitch irregularities, paper breakage, and poor water extraction due to a decrease in the degree of vacuum in the suction box. For example, polyoxyethylene (5 to 20%
mole) alkyl ether or polyoxyethylene (5 to 2
0 mol) Alkyl phenyl ether has a certain degree of detergency, but has the disadvantage of having too large a foaming power.
Further, polyoxypropylene-polyoxyethylene block copolymers, which are known for their low foaming properties, have a certain degree of low foaming properties, but have the drawback of poor detergency.

As described above, there has been no known surfactant that has sufficient detergency against the stains peculiar to felt and has low foaming properties. Therefore, the inventors of the present invention have conducted intensive research to solve the above-mentioned drawbacks and to obtain a low-foaming cleaning agent that has great felt cleaning power that can meet the demands for technological innovation. When used as a cleansing active ingredient, the above-mentioned purpose can be achieved by finding scales and completing the present invention.

That is, the present invention provides a felt cleaning agent for papermaking, which is characterized by containing a compound represented by the following general formula (1).

(In formula (1), R, , R2, R3 and R4 are each a group selected from the group consisting of alkyl, cycloalkyl, aryl and aralkyl groups, and the total number of carbon atoms in these groups is at least 7. and m+n is 2 to 50 on average.

) The compound represented by the general formula (1) according to the present invention is a substance belonging to the so-called nonionic surfactants, but its chemical structure is characteristic, with one acetylene bond, two
polyoxyethylene chains and at least two branches. The above-mentioned characteristic structure not only exhibits excellent cleaning power against dirt peculiar to felt, but also contributes to low foaming properties. Furthermore, R,,R2. It is necessary that the total number of carbon atoms in R3 and R4 is 7 or more. If the total of these is 6 or less, sufficient cleaning power cannot be obtained. The number of moles of ethylene oxide added (m1n) is 2 to 5
It is necessary that the ratio be within a range of 0, and if it is outside this range, the excellent effects of the present invention cannot be obtained. General formula of the present invention (
Specific examples of the compound represented by 1) include 7,10-dimethyl-8-hexadecine-7,10-diol ethoxylate, 2,4,7,9-tetramethyl-5-decyne-4,7-diol ethoxylate, 4 , 7-dimethyl-5-decyne-4,7-diol ethoxylate, 2
, 5-diphenyl-3-hexyne-2,5-diolethoxylate, and the like.

Among them, 2,4,7,9-tetramethyl-5-decyne-4,7-diol ethoxylate, 4,7-dimethyl-5-decyne 4,7-diol ethoxylate, 7,1
0-dimethyl-8-hexadecine-7,10-diolethoxylate is preferred. The compound represented by the general formula (1) of the present invention can be obtained by adding ethylene oxide to the compound represented by the following general formula (0) using a known method.

(In formula (1), R, , R2, R3 and R4 are each a group selected from the group consisting of alkyl, cycloalkyl, aryl and aralkyl groups, and the total number of carbon atoms in these groups is at least 7. .

) For example, the above glycol is reacted with 50 to
One example is a method in which ethylene oxide is reacted at a temperature of 15.0 mm.

The compound of the present invention exhibits excellent effects even when used alone, but even more excellent cleaning power can be obtained by using it in combination with an amine solvent.

Examples of the amine solvent include compounds represented by the following general formulas (m) to (V).

(In formulas (m) to (V), R5, R6, R7, and R8 are each day or an alkyl group having 1 to 10 carbon atoms, and 1 to 5 carbon atoms.
is an alkylol group, and a and b are integers of 1 to 5.

) Also, even better cleaning power can be obtained by using it in combination with a wetting and penetrating agent.

Ethylene oxide (2
~10 mol) adducts. Furthermore, the detergency can be enhanced by using it in combination with a polyoxyethylene-polyoxypropylene compound or various pilders.
Examples of the polyoxyethylene-polyoxypropylene compound include pluronic-type or tetronic-type nonionic surfactants, and polyoxyethylene-polyoxypropylene adducts of alcohols or alkylphenols. As a builder, trisodium phosphate, sodium hydrogen phosphate, sodium dihydrogen phosphate, sodium pyrophosphate, sodium dihydrogen pyrophosphate, sodium tripolyphosphate, sodium trimetaphosphate, sodium hexametaphosphate (sodium phosphate), Sodium oxalate, sodium sulfate, sodium carbonate (alkaline compounds), nitrilotriacetic acid, ethylenediaminetetraacetic acid (or their sodium salts) (
aminopolycarboxylic acid), sodium citrate, sodium maleate, sodium gluconate, sodium acetate, sodium adipate, sodium oxydiacetate (monomer sodium carboxylate), glycerin ester citrate, glycol ester citrate polycarboxylic acid ester), tetrahydrofurantetracarboxylic acid, cyclobentanetetracarboxylic acid, benzenehexacarboxylic acid, benzenetetracarboxylic acid (cyclic polycarboxylic acid), sodium polymaleate,
Examples include sodium polyacrylate, polystyrene-sodium maleate, polyvinyl alcohol-sodium maleate, polyvinyl methyl ether-sodium maleate (polymer electrolytes), and particularly preferred are sodium phosphate, alkali, potassium compounds, Aminopolcarboxylic acid, a polyelectrolyte. The ratio of these builders to 10 parts by weight of the cleaning active ingredient represented by the general formula (1) is preferably 10 to 25 parts by weight. In addition, active agents such as anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants, solvents, acids, or alkalis may be added as long as they do not impair the effects of the present invention. be able to.

Detergents containing the compounds of the present invention are generally used in concentrations of 0.01 to 10%. EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

The evaluation of the washability was determined by the water squeezing ability of the felt after washing.

This means that there is a correlation between the water squeezing property (furnace water property) and the amount of dirt attached to the felt.If the felt is clogged with dirt by less than 50% of the area, the amount of dirt is almost parallel to the furnace water time. It is based on the discovery that there is a relationship. Example 1 Used newsprint felt was spray-cleaned using the felt cleaning agent of the present invention and a conventionally known felt cleaning agent, and the water extraction performance, amount of dirt remaining on the felt, and foaming properties of the felt after cleaning were evaluated. was measured.

The results are shown in Table 1. Table 1 Note) 1) 80: ethylene oxide unit, PO: propylene oxide unit, number is the number of moles added 2) Foam high density determined by Rothmils method (based on JIS K-3362K) Detergent concentration 0.2 Evening/Otsu, temperature 40℃ 3) Spray conditions: Cleaning agent concentration 0.22/Z, temperature 40℃, spray time 2 hours, soufflé flow rate 2.55 Autumn/female/mln 4) Water squeezing ability: -45 Willow Hg It is expressed as the time required for 500 cc of water to pass through 30 pieces of felt under reduced pressure.

5) Remaining amount of dirt: refers to the weight of the extract obtained by processing the washed felt with a Soxhlet extraction device.

Extraction conditions: Solvent ethanol-runobenzene (silica wt*), extraction time 6 hours 6) Uncleaned Example 2 Spray cleaning of used newsprint felt using the following cleaning agents 1 to V (cleaning agent concentration 0. 2%, above 2.55/
soil/mln at 40°C for 2 hours).

The results are shown in Table 2. Cleaning agent 1 Cleaning agent 0 Cleaning agent m Cleaning agent W Cleaning agent V Table 2 (1) Uncleaned example 3 Spray cleaning of used felt for medium-sized paper using ~X of the following cleaning agents (cleaning agent concentration 0 .05%, 2.55 M/min, 40° C. for 5 hours).

The results are shown in Table 3. Cleaning agent Skin cleaning agent Field cleaning agent K Cleaning agent 55 [
/ ground · min, 4000 for 5 hours).

The results are shown in Table 4. Cleaning agent Red cleaning agent Willow cleaning agent .55 [/young-mln, 2 hours at 40°C] was carried out.

The results are shown in Table 5. Cleaning agent XW Cleaning agent XV Cleaning agent XW Cleaning agent X skin Cleaning agent Cleaning agent XK Table 5 (1) Unwashed

Claims (1)

[Scope of Claims] 1. A felt cleaning agent for papermaking, characterized by containing a compound represented by the following general formula (I). ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In formula (I), R
_1, R_2, R_3 and R_4 are each alkyl,
A group selected from the group consisting of cycloalkyl, aryl, and aralkyl groups, in which the total number of carbon atoms in these groups is at least 7, and m+n is 2 to 5 on average.
It is 0. )