JPS6022117B2 - 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 pulp preparation, paper making, dehydration, and drying.

Focusing on the dehydration process, the paper-made wet paper is placed in a plowing section to remove most of the water, but it still contains a lot of water, and when it is immediately heated and dried, it produces a lot of steam. In addition, the fibers are not sufficiently intertwined, making it difficult to obtain paper with high strength. Therefore, the green paper from Sukikinu 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 upper and lower rolls, and a felt for transporting the wet paper.The wet paper is placed on the felt and guided, and both are placed between the rolls. It is pressed through 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, uniform water extraction is inhibited and various troubles occur.

For example, paper breaks during the pressing process, generation of defective products, increased steam during the drying process, increased draw adjustment, etc. Therefore, it is important to keep the felt clean at all times in order to increase papermaking efficiency. In recent years, structural changes have taken place in the pulp and paper industry in terms of raw material procurement, and the consumption of used paper and hardwood materials have increased significantly.

Along with this, the quality of dirt that enters the papermaking process has also changed significantly. In the pulp recycled from waste paper, there are carbon that has not been completely removed and pitches from the ground pulp. Hardwood materials contain more resin and resin than softwood materials.
Contains a lot of oils and fats. As described above, the unique stains on felts are increasing, and furthermore, as paper manufacturing speeds increase, it is becoming difficult to maintain felts in a satisfactory condition using conventional cleaning agents. . Conventionally known cleaning agents used in felt cleaning agents for papermaking include polyoxygens such as lauryl alcohol, oleyl alcohol, nonylphenol, octylphenol, dodecyl alcohol, tridecyl alcohol, and C,2-C,4sec-alcohol. Among tyrene adducts, compounds in which the number of moles of ethylene oxide added is 7 to 15 moles are often used.

However, these cleaning agents lack cleaning power against complex adhesive stains such as pitch and residual carbon, which have been increasing in the papermaking process in recent years. Additionally, cleaning agents containing petroleum-based solvents or acids have been tried, but they suffer from corrosion of the equipment, restrictions on handling, and some are classified as hazardous materials under the Fire Service Act, making them undesirable considering the work environment at the site. .

Therefore, the inventors of the present invention have made extensive research efforts to overcome the above-mentioned drawbacks and to obtain a cleaning agent with great cleaning power that can meet the demands for technological innovation. The inventors have found that the above object can be achieved and have completed the present invention. That is, the present invention uses {agE ionic surfactant and one or more compounds selected from the group consisting of compounds represented by the general formula 'b} '1} and [2}, 'a)/' b}=98/2 to 70/30 in a weight ratio.

(In formula m, R is an alkyl'alkenyl or cycloalkyl group having 4 to 22 carbon atoms, m is 2 to 10 on average, and n is 1 or 2.

) (In formula [2}, R,, R2 is an alkyl, alkenyl or cycloalkyl group having 4 to 22 carbon atoms, and M is an alkali metal or ammonium.) According to the present invention (
a} Nonionic surfactants include higher alcohol ethylene oxide adducts, alkylphenol ethylene oxide adducts, fatty acid ethylene oxide adducts, polyhydric alcohol fatty acid ester ethylene oxide adducts,
Polyethylene glycol type nonionic surfactants such as higher alkylamine ethylene oxide adducts, fatty acid amide ethylene oxide adducts, ethylene oxide adducts of oils and fats, polypropylene glycol ethylene oxide adducts, and fatty acid esters of glycerol. It refers to polyhydric alcohol type nonionic surfactants such as fatty acid esters of pentaerythritol, fatty acid esters of sorbitol, fatty acid esters of solpitan, alkyl ethers of polyhydric alcohols, and fatty acid amides of alkanolamines. The compounds represented by the general formulas {1} and 2' according to the present invention are important for the present invention, and the excellent effects of the present invention cannot be obtained when used in combination with surfactants other than these.

The compound represented by the general formula m is a mono- or dialkyl (
Here, alkyl is an ethylene oxide adduct of a phosphate ester (including alkyl, alkenyl, and cycloalkyl).

Sesquialkyl phosphates, which are mixtures of monoalkyl phosphates and dialkyl phosphates, are preferred. Specific examples include sesqui 2-ethylhexyl phosphate ester ethylene oxide (6 mol) adduct (hereinafter referred to as POE {6'2-ethylhexyl sesquiphosphate), POE octyl sesquiphosphate, POE' 5}Lauryl sesquiphosphate, FOE
[9) Tridecylsesquiphosphate, POE {4)/
V remityl sesquiphosphate, POE (7,3) stearyl sesquiphosphate, POE (10) oleyl sesquiphosphate, POE'7} amyl sesquiphosphate, and the like. These compounds can be synthesized by various methods, but a general synthesis method is to add ethylene oxide to mono- and dialkyl phosphate esters obtained by reacting the corresponding alcohol with phosphoric acid using a known method. One method is to do so.

The compound represented by the general formula (■) is a dialkyl sulfosuccinate, and specific examples include di-2-ethylhexyl sulfosuccinate, dioctyl sulfosuccinate, dilauryl sulfosuccinate,
Examples include sulfosuccinic acid distaryl ester, sulfosuccinic acid diaryl ester, sulfosuccinic acid ditridecyl ester, and the like.

The countercation of the sulfonic acid group is an alkali metal ion or an ammonium ion. The ratio of the compounds represented by the general formulas '1' and [2' to the nonionic surfactant is also important.

The compounds represented by general formulas m and (■)/nonionic surfactant should be blended in a weight ratio of 2/Satoshi to 30/70 (weight ratio), and if the ratio is less than 2/Satoshi, the remarkable effects of the present invention can be obtained. cannot be obtained, and when the ratio exceeds 30/70, the effect gradually deteriorates. Since the felt cleaning agent of the present invention has the above-mentioned composition, it exhibits excellent cleaning effects not found in conventional felt cleaning agents.However, by using the composition of the present invention in combination with an amine solvent, even more excellent cleaning power can be achieved. can be obtained.

The following general formula '31~(
5}.

(In the formulas {3' to {5-, R3, R4, R5, and R6 are H or an alkyl group having 1 to 10 carbon atoms, or an alkylol group having 1 to 5 carbon atoms, and a and b are 1 to 5 carbon atoms. (This is an integer.) Furthermore, the detergency can be enhanced by using various pilders in combination. Builders that can be used in combination include trisodium phosphate, sodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium pyrophosphate, sodium dihydrogen pyrophosphate, sodium tripolyphosphate, sodium trimetaphosphate, sodium hexametaphosphate (sodium phosphate ), sodium lotus acid, sodium sulfate, sodium carbonate (alkaline compounds), nitriacetic 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 citric acid polycarboxylic acid ester), tetrahydrofurantetracarboxylic acid, cyclobentanetetracarboxylic acid, benzenehexacarboxylic acid, benzenetetracarboxylic acid. (
These include cyclic polycarboxylic acids), sodium polymaleate, sodium polyacrylate, polystyrene-sodium maleate, polyvinyl alcohol-sodium maleate, polyvinyl methyl ether-sodium maleate (polymer electrolytes), etc. Preferred are sodium phosphate, alkali compounds, aminopolycarboxylic acids, and polymer electrolytes.

The blending ratio of such pillder is 10% of the cleaning active ingredient of the present invention.
It is desirable that the amount is 10 to 20 parts by weight per animal. In addition, active agents such as anionic surfactants, ionic surfactants, amphoteric surfactants, solvents, acids or alkalis, etc. other than the above-mentioned essential components may be added as long as they do not impair the effects of the present invention. can.

The cleaning agent containing the compound of the present invention is usually 0.01 to 10 days/day.
used at that concentration. 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 is because there is a correlation between water squeezing performance (furnace water property) and the amount of sticky dirt attached to the felt. This is based on the discovery that there is an almost parallel relationship between the two. Example 1 Used newsprint felt was spray-cleaned using the cleaning composition shown in Table 1, and the water extractability of the felt after washing and the amount of dirt remaining on the felt were measured.

The results are shown in Table 1. ship Kenkirei and Saint also Go to Seireiki fever pounding crocodile .

Example 2 Using the cleaning composition shown in Table 2, used medium-sized paper felt was spray-cleaned.

The results are shown in Table 2. The spray cleaning conditions were the same as in Example 1. Table 2 Ship Selection Beiyo Example 3 Using the cleaning composition shown in Table 3, used newsprint felt was spray cleaned.

Claims (1)

[Scope of Claims] 1. One or more compounds selected from the group consisting of (a) a nonionic surfactant and (b) compounds represented by general formulas (1) and (2); /(
b) A felt cleaning agent for papermaking containing a weight ratio of 98/2 to 70/30. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In formula (1), R is an alkyl, alkenyl or cycloalkyl group having 4 to 22 carbon atoms, and m is an average of 2 to 22 carbon atoms.
10, and n is 1 or 2. )▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In formula (2),
R_1 and R_2 are alkyl, alkenyl or cycloalkyl groups having 4 to 22 carbon atoms, and M is an alkali metal or ammonium. )