JPS6022118B2 - 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 passed through a screen to remove most of the water, but it still contains a lot of water, and when it is immediately heated and dried, a lot of steam is released. In addition, the fibers are not sufficiently intertwined, making it 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, uniform squeezing performance is inhibited and various troubles occur.

For example, paper breaks in the pressing process, generation of defective products, increase in steam in the drying process, increase in draw preparation, etc. Therefore, it is important to keep the felt clean at all times.
This is important in increasing papermaking efficiency. In recent years, structural changes have been occurring in the pulp and paper 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 enters the papermaking process has also changed significantly. In the pulp recycled from waste paper, there are carbon and pitches that have not been completely removed and remain.
Hardwood materials contain more resins and oils than softwood materials. As described above, the amount of dirt adhering to felts, which is unique to the pulp and paper industry, is increasing and becoming a problem.Furthermore, as paper making speeds increase, it is becoming difficult to maintain felts in a satisfactory condition using conventionally known cleaning agents. This is a situation that is becoming more and more common. Conventional cleaning agents used in felt cleaning agents for papermaking include, for example, lauryl alcohol, oleyl alcohol,
Among polyoxyethylene adducts such as nonylphenol, octylphenol, tridecyl alcohol, CI2 to CI4SeC-alcohol, compounds having an added mole of ethylene oxide of 7 to 16 moles are often used.

However, these cleaning agents lack cleaning power against composite adhesive stains such as pitch and residual carbon, which have been increasing in the papermaking process in recent years.

Cleaning agents containing petroleum solvents or acids have also been tried, but these are undesirable in view of the on-site work environment, as they corrode the equipment and are restricted in handling.

Therefore, the inventors of the present invention have made earnest efforts to solve the above-mentioned drawbacks and to obtain a cleaning agent with great cleaning power that can meet the demands for technological innovation. The present invention has been completed by discovering that the above-mentioned object can be achieved by using them together.

That is, the present invention provides a felt cleaning agent for papermaking whose main components are a solvent represented by the following general formula [1} and a surfactant represented by the general formula (2).

R, 1○tAOchinnR2...'11
(In formula m, R is an alkyl group or alkenyl group having 1 to 6 carbon atoms, A is an alkylene group having 2 to 3 carbon atoms,
n is 1 to 6 on average, and R2 is H or carbon number 1 to 6
is an alkyl group or alkenyl group.

) (Formula {2), R3 is an alkyl'alkenyl or cycloalkyl group having 4 to 22 carbon atoms, p is 1 or 2, and q is 1 to 10 on average.

) The blending ratio of the above solvent and surfactant is 60% by weight.
/40 to 99/1. Less than 60/40 or 99
If it exceeds /1, the cleaning power will be significantly reduced.

Particularly preferred is a range of 70/30 to 98/2. Examples of the solvents represented by the general formula [1-] used in the present invention include ethyl cellosolve, butyl cellosolve, carbitol, diethylene glycol butyl ether, diethylene glycol butyl ethyl ether, tetraethylene glycol ethylhexyl ether, propylene glycol diethyl ether, propylene glycol In addition to ethyl ether, examples include compounds obtained by adding ethylene oxide and/or propylene oxide to an alcohol having 1 to 6 carbon atoms. In the present invention, the excellent cleaning power of the present invention cannot be obtained with a solvent other than the solvent represented by the general formula (1).
1}, those in which AO is ethylene oxide are particularly excellent. Furthermore, the number of moles of AO added is critical and is between 1 and 6.
If it is out of this range, the detergency and solubility (which will eventually affect the detergency) will be unsatisfactory. The surfactant represented by the general formula (2) is an ethylene oxide adduct of a mono- or dialkyl (herein, alkyl includes alkyl, alkenyl and cycloalkyl) phosphate. Sesquialkyl phosphates, which are mixtures of monoalkyl esters and dialkyl phosphates, are preferred.

As a specific example, sesqui-2-ethylhexyl phosphate ester ethylene oxide (6 mol) adduct (hereinafter referred to as P
Indicated as OE[6}2-ethylhexylsesquiphosphate. ), POE (61 octyl sesquiphosphate, POEt5} lauryl sesquiphosphate, POE [
Examples include 9' tridecyl sesquiphosphate, POE [4' valmityl sesquiphosphate, POE (7,3) stearyl sesquiphosphate, POEt1 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. Can be mentioned.

The papermaking felt cleaning agent of the present invention has superior cleaning power compared to conventional cleaning agents, and is effective against dirt peculiar to felt.

Moreover, it has an extremely low foaming rate and is characterized by eliminating foaming problems during the papermaking process. In carrying out the present invention, even more excellent cleaning power can be obtained by using an amine solvent in addition to the composition of the present invention.

Examples of the amine solvent include compounds represented by the following general formulas '3} to '5}.

(Formula (3} ~ Hatanaka, R4, R5, R6, R7 or an alkyl group having 1 to 10 carbon atoms, an alkylol group having 1 to 5 carbon atoms, and a and b are integers of 1 to 5.

) The cleaning power can also be increased by using it in combination with a builder. As a builder, trisodium phosphate, sodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium pyrophosphate, sodium dihydrogen pyrophosphate, sodium tripolyphosphate, sodium trimetaphosphate, sodium hexametaphosphate (sodium phosphate), Ren sodium acid, sodium sulfate, sodium carbonate (alkaline compounds), sodium nitrilotriacetate, sodium ethylenediaminetetraacetate (aminopolycarboxylic acid),
Sodium citrate, sodium maleate, sodium gluconate, sodium acetate, sodium adipate, sodium oxydiacetate (sodium monocarboxylate), glycerin ester citrate, glycol ester citrate (polycarboxylate ester), Tetrahydrotetracarboxylic acid (cyclic polycarboxylic acid), sodium polymaleate, sodium polyacrylate, polyethylene-sodium maleate, polyvinyl alcohol-sodium maleate, polyvinyl methyl ether-sodium maleate (polymer electrolyte) Particularly preferred are sodium phosphate, alkali compounds, aminopolycarboxylic acids, and polymer electrolytes. These builders are preferably blended in an amount of 10 to 20 parts by weight per 100 parts by weight of the cleaning active ingredient. In addition, an anionic surfactant, a nonionic surfactant, a cationic surfactant, an amphoteric surfactant, an acid or an alkali, etc. can be added as long as they do not impair the effects of the present invention. The cleaning agent containing the compound of the present invention usually has a concentration of 0.01 to 109
/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 means that there is a correlation between water extraction performance (furnace water resistance) and the amount of sticky dirt attached to the felt. This is based on the discovery that there is a nearly proportional relationship between 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. Table 1 1) 80 nethylene oxide units. The number is the number of moles added (2) Soubre "Condition: Cleaning concentration 0.2"Temperature 40℃.Spray for 1 hour and charge at 2 o'clock.Soubre"Liquid volume 2.55
He〆Huan/min3) Flammability: 45 Hg ■ 5 under reduced pressure
This is the time required for 0.00 micrometers of water to pass through 30 micrometers of felt.

4) Amount of remaining dirt: refers to the weight of the extract obtained by processing the washed felt with a Soxhlet extraction device.

Extraction conditions: Solvent ethano [1/2 wt grandson of Le/Penzen]
5) Unwashed Felt Example 2 Using the cleaning composition shown in Table 2, used felt for medium-sized paper was spray-cleaned.

The results are shown in Table 2. The spray cleaning conditions were the same as in Example 1. Table 2 1) *Washing boat rice selection 2 Example 3 Using the cleaning composition shown in Table 3, used newsprint felt was spray cleaned.

Claims (1)

[Claims] 1 General formula (1) R_1-O-(AO)-_n-R_2 ...(1)
(In formula (1), R_1 is an alkyl group or alkenyl group having 1 to 6 carbon atoms, A is an alkylene group having 2 to 3 carbon atoms, n is 1 to 6 on average, and R_2 is H or an alkenyl group having 1 to 6 carbon atoms. 1 to 6 alkyl or alkenyl groups.) 60 to 99 parts by weight of a solvent represented by the general formula (
2) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In formula (2), R_3 is alkyl having 4 to 22 carbon atoms,
It is an alkenyl or cycloalkyl group, p is 1 or 2, and q is 1 to 10 on average. ) A felt cleaning agent for papermaking, characterized in that it contains 40 to 1 part by weight of a surfactant represented by: