JPH0578993A - Felt cleaner for papermaking - Google Patents

Abstract

PURPOSE:To obtain the title cleaner having strong cleaning power, low foaming properties and improved workability, comprising a specific compound as an essential component. CONSTITUTION:The objective cleaner comprising a compound of formula (R) is 7-21C alkyl or alkenyl; R2 is 1-4C alkyl or alkenyl; m is 2-4; n is 3-50) as an essential component, an anionic surfactant, a cationic surfactant, solvent, etc.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a felt cleaning agent for papermaking. More specifically, the present invention relates to a papermaking felt detergent that cleans papermaking felt used in the pulp and paper industry, maintains uniform water squeezing ability, and extends the life of the felt.

[0002]

2. Description of the Related Art Papermaking processes include pulp preparation, papermaking, dehydration,
It consists of processes such as drying. Regarding the dehydration process, the wet paper made from paper has a large amount of water, although most of the water is removed by the plow net portion. When this wet paper is heated and dried, a large amount of steam is required, and the fibers are not sufficiently entangled with each other, so that the strength of the paper decreases.

Therefore, the wet paper web from the mesh is moved by being placed on a felt, mechanically pressed between rolls, dehydrated, and then dried. The dehydration rate in this step is affected by various factors, but the water squeezing of the felt is particularly important. The felt in the papermaking process must always be porous, flexible and uniform, but it is clogged with various impurities. The substances that cause clogging are pitches and fine fibers from the raw materials, sizing agents, inorganic substances such as clay and calcium carbonate, polyvalent metals and slimes from water. If dirt becomes attached to the felt and causes clogging, uniform water squeezing is hindered, paper runs out during dehydration, vapor increases during drying,
Problems such as increased draw adjustment occur.

Therefore, it is necessary to keep the felt clean at all times, and various surfactants have been conventionally used as felt detergents in order to efficiently remove dirt on the felt and improve durability. Conventionally known surfactants used in papermaking felt detergents include, for example, lauryl alcohol, oleyl alcohol, nonylphenol,
Octylphenol, dodecyl alcohol, C12-C
14 Polyoxyethylene adduct such as secondary alcohol,
A compound having an ethylene oxide addition mole number of 5 to 20 moles is used. Although these surfactants have a detergency, they have a large foaming property and have a problem that foaming troubles in the paper making process, such as poor formation, uneven color, deterioration of quality due to pitch stain, and paper breakage occur. ..
Further, when a pluronic surfactant known to have a low foaming property is used, although the foaming property is reduced to some extent, there is a problem that the detergency is deteriorated.

Further, as a low-foaming felt detergent, for example, Japanese Patent Application Laid-Open No. 58-60089 proposes a nonionic surfactant having a characteristic chemical structure. But,
Since such a nonionic surfactant has an unsaturated bond in the molecule, it has poor stability in a papermaking system or product stability, weaker detergency, and is costly for industrial use. Getting higher.

[0006]

DISCLOSURE OF THE INVENTION The present invention has a strong detergency against various stains adhering to the felt, and has a low foaming property so that there is no foaming obstacle in the papermaking process and the workability is improved. It is intended to provide a cleaning agent capable of improving the above.

[0007]

The felt cleaning agent for papermaking of the present invention is characterized by containing a compound represented by the following chemical formula 2 as an essential component.

[0008]

[Chemical 2]

The alkoxypolyoxyalkylene fatty acid ester used in the present invention is obtained by, for example, adding an alkylene oxide to an alcohol to give an adduct,
Next, a method for producing an esterification reaction or a transesterification reaction between this and a fatty acid or a fatty acid ester (Production Method-1),
Addition of alkylene oxide to fatty acid to give an adduct,
Next, this is reacted with an alkyl halide (production method-
By 2), it can be obtained. Further, a method of adding an alkylene oxide to an esterified product of a fatty acid and an alcohol using a specific catalyst (Japanese Patent Application No. 3-63).
No. 904 specification),
By following this method (Production Method-3), the compound shown in Chemical formula 2 having a high purity can be obtained, which is particularly preferable.

In the compound represented by the above chemical formula 2 used in the present invention, R1 is a fatty acid residue selected from one or two or more linear or branched alkyl or alkenyl groups having 7 to 21 carbon atoms. Is. R1 is preferably an alkyl group or an alkenyl group having 11 to 17 carbon atoms.

Specific examples of the fatty acid constituting the fatty acid residue include caprylic acid (C8), pelargonic acid (C9), capric acid (C10), undecanoic acid (C11), lauric acid (C12), myristic acid (C14). ), Palmitic acid (C16), margaric acid (C17), stearic acid (C18), arachidic acid (C20), behenic acid (C2)
Examples thereof include saturated fatty acids such as 2) and unsaturated fatty acids such as oleic acid (C18), elaidic acid (C18), linoleic acid (C18), linoleic acid (C18) and erucic acid (C22).

The fatty acids may be natural or synthetic fatty acids of vegetable or animal origin. Examples of the plant-derived fatty acid include corn oil, cottonseed oil, castor oil, palm oil, palm kernel oil, peanut oil, rapeseed oil, sesame oil, soybean oil, safflower oil, palm oil and the like. Examples of animal-derived fatty acids include pork oil, beef tallow oil, herring oil, squid oil and whale oil.

These fatty acids may be used alone or in admixture of two or more.

In the compound represented by Chemical formula 2, R2 is selected from one or more kinds of linear or branched alkyl groups or alkenyl groups. R2 has 1 to 4 carbon atoms.

Specific examples of the alcohol constituting the alcohol residue include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, tert-butyl alcohol, allyl alcohol and the like. ..

These alcohols may be used alone or in admixture of two or more.

In the above general formula 2, m is an integer of 2 to 4, and (OCmH2m) is an alkylene oxide. Specific examples include ethylene oxide, propylene oxide and butylene oxide, and at least one of them is selected.

In the general formula 2, n is the number of moles of the alkylene oxide added, and is usually 3 to 50, preferably 5 to 20. These may be used alone or in combination of two or more, and may be added randomly or in blocks.

The detergent of the present invention shows a strong detergency even when an alkoxypolyoxyalkylene fatty acid ester is used alone as an active ingredient, but other anionic surfactants, cationic surfactants and amphoteric surfactants are used. It can also be used by adding a surfactant, a solvent, an acid or an alkali.

Further, the cleaning power can be enhanced by using various builders together. As the builder, trisodium phosphate, sodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium pyrophosphate, sodium dihydrogen pyrophosphate, sodium tripolyphosphate, sodium trimetaphosphate, sodium hexametaphosphate, etc., sodium silicate. , Alkali compounds such as sodium sulfate and sodium carbonate, aminopolycarboxylic acids such as nitrilotriacetic acid and ethylenediaminetetraacetic acid (or their sodium salts), sodium citrate, sodium maleate, sodium gluconate, sodium acetate,
Sodium adipate, sodium monocarboxylates such as sodium oxydiacetate, polycarboxylic acid esters such as glyceryl citrate, glycol citrate, tetrahydrofuran tetracarboxylic acid, cyclopentane tetracarboxylic acid, benzene hexacarboxylic acid, benzene tetra Examples thereof include cyclic polycarboxylic acids such as carboxylic acids, sodium polymaleate, sodium polyacrylate, polystyrene-sodium maleate, polyvinyl alcohol-sodium maleate, polyvinyl methyl ether-sodium maleate, and other polymer electrolytes. Preferred are sodium phosphate, alkaline compounds, aminopolycarboxylic acids, and polyelectrolytes.

The cleaning agent of the present invention is usually 0.01 to 0.5.
Used at a concentration of wt%. When used in combination with another surfactant, the other detergent is used in a weight ratio of 5 to 50% by weight with respect to the alkoxypolyoxyalkylene fatty acid ester. Further, the builder is usually used in an amount of 10 to 250% by weight based on the total amount of the detergent.

[0022]

EFFECTS OF THE INVENTION According to the felt cleaning agent of the present invention, since the felt cleaning agent which is made of paper-making impurities has a sufficient cleaning power, the water squeezing property can be kept uniform and the workability can be improved. it can. In addition, since it has a low foaming property, it is possible to eliminate foaming troubles such as poor formation, color unevenness, deterioration of quality due to pitch stain, and paper breakage.

[0023]

[Examples] Using an aqueous solution in which various nonionic surfactants shown in Table 1 were dissolved as active ingredients, the penetrating power, foaming property and detergency were evaluated by the following evaluation methods, and the results are shown in Table 2.
It was shown to.

(1) Penetration force Measurement was carried out according to the Draves method (0.1% by weight aqueous solution, 25 ° C.).

(2) Foaming power A 0.1 liter test liquid 2 was added to a 1-liter measuring cylinder.
Add 00 ml, glass filter from the bottom (Kinoshita N
o. 2) and nitrogen gas at 0.3 liter / min.
For 3 minutes, and the amount of foaming (ml) over time was measured. The measurement was performed at 25 ° C.

(3) Detergency A test piece of contaminated felt (7 cm × 7 cm) was dipped in 400 ml of a 0.5 wt% test solution at 50 ° C. for 48 hours,
The suspension of this test solution was measured with a spectrophotometer (660 nm). The turbidity (blank value) of the test liquid when the contaminated felt was not used was 0.000 to 0.001.

[0027]

[Table 1]

[0028]

[Table 2]

Claims (1)

[Claims] 1. A felt cleaning agent for papermaking, comprising a compound represented by the following chemical formula 1 as an essential component. [Chemical 1]