JP2787418B2 - Felt cleaner for papermaking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. 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 used for cleaning papermaking felt used in a paper pulp manufacturing process and maintaining uniform water squeezing.

[0002]

2. Description of the Related Art Papermaking processes include pulp preparation, papermaking, dewatering,
It consists of steps such as drying. Focusing on the dewatering step, pulp slurry of about 1% by weight is first dewatered to about 20% by weight in a wire part by a wire, a foil, a suction box, etc., but still has a large amount of water. ing. Therefore, the first purpose of the dewatering step is to mechanically squeeze water through the felt by passing the paper between the two pressurized rolls together with the felt before entering the drying step. The amount of water dewatered in the dehydration step is very important because it immediately affects the amount of heat required in the drying step, that is, the steam cost required for drying. If dirt adheres to the felt, the water squeezing property of the wet paper deteriorates. As a result, various problems such as running out of paper in the dewatering step, increasing the amount of steam used in the drying step, and increasing the draw adjustment occur. Therefore, it is important to keep the felt clean at all times in order to increase papermaking efficiency. 2. Description of the Related Art Conventionally, various surfactants have been used as a felt cleaning agent in order to efficiently remove felt stains and extend the service life of the felt. Conventionally known detergents used in papermaking felt detergents include, for example, lauryl alcohol, oleyl alcohol, noniphenol, octylphenol, and carbon number 1
A compound obtained by adding ethylene oxide to an alcohol such as 2 to 14 secondary alcohols and having an added mole number of 5 to 2
Zero moles of the compound are commonly used. However, with these conventional cleaning agents, cleaning of composite sticky contaminants such as pitches and residual carbons due to the increase in the types of added chemicals in recent years, the increase in the amount of waste paper pulp used, and the increase in the rate of recovered water. It's getting harder. Although cleaning with a petroleum organic solvent and an acid is also performed, it is not preferable in view of corrosion of the machine, damage to the felt, danger in handling, and influence on the environment.

[0003]

SUMMARY OF THE INVENTION Under such circumstances, the present invention is to provide a strong cleaning power for various kinds of dirt adhering to felt and extend the service life of the felt. The purpose of the present invention is to provide a cleaning agent that can be used.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the combined use of d-limonene and a nonionic surfactant resulted in the adhesion to papermaking felt. It has been found that the present invention exerts a strong detergency on various types of stains, and the present invention has been completed based on this finding. That is, the present invention relates to d-limonene and at least one nonionic surfactant selected from the group of nonionic surfactants represented by the following general formulas [1] to [4]: the weight ratio of ionic surfactant is 5: 95 to 40: 60 papermaking felt cleaning agent characterized in that it contains in an amount such that the ratio _{of, RO (AO) n H ...} [1]

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Embedded image (Wherein, R represents a hydrogen atom, an aliphatic hydrocarbon group, or an aromatic hydrocarbon group, and AO represents at least one oxyalkylene group selected from an oxyethylene group, an oxypropylene group, and an oxybutylene group. Represents a single adduct thereof, or, in the case of two or more, a block adduct,
Any of random adducts may be formed, and I + m
Is 1 to 200, and n is 1 to 200. However,
When R in the general formula [1] is a hydrogen atom, n is 5 to 2
00. ), Is provided.

[0005] The d-limonene used in the present invention is mainly separated from the leaves, rhizomes, bark, fruits, buds, resins and the like of plants by steam distillation, extraction and the like. D-Limonene extracted from natural citrus fruits is advantageous in terms of biodegradability, availability and economy. As the form of felt cleaner for papermaking, in terms of handling safety and workability,
A blend of d-limonene and a nonionic surfactant that can be used in an aqueous system is desirable. These nonionic surfactants can be used alone or in combination of two or more. As the nonionic surfactant used in the present invention, polyoxyalkylene alkyl ether,
Examples include polyoxyalkylene alkyl allyl ether, polyoxyalkylene alkylamine, polyoxyalkylene glycol, polyoxyalkylene alkylamide, and polyoxyalkylene alkyl ester.

[0006] In the felt detergent for papermaking of the present invention, in particular, the felt detergent for water-based papermaking, the ratio of d-limonene to the nonionic surfactant is 5:95 to 40:40 by weight.
60. If the ratio of d-limonene to the nonionic surfactant is less than 5:95 by weight, the detergency of d-limonene is not sufficiently exhibited, which is not preferable. d-
The ratio of limonene and nonionic surfactant is 4 by weight.
If the ratio exceeds 0:60, when the felt detergent for papermaking is diluted with water, the emulsification or solubilization of d-limonene in water may be insufficient. In the felt detergent for papermaking of the present invention, a nonionic surfactant represented by the following general formulas [1], [2], [3] and [4] is used as the nonionic surfactant. Can be. _{RO (AO) n H ... [} 1]

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Embedded image In the formula, R represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 24 carbon atoms, or an aromatic hydrocarbon group having 6 to 24 carbon atoms, and AO represents an oxyethylene group, an oxypropylene group,
Represents at least one oxyalkylene group selected from oxybutylene groups, and represents a single adduct thereof or 2
In the case of more than one kind, any of a block adduct and a random adduct may be constituted, l, m, and n represent the number of moles added, l + m is from 1 to 200, and n is from 1 to 200. . However, when R is a hydrogen atom in the general formula [1], n
Is 5-200. Examples of the aliphatic hydrocarbon group having 1 to 24 carbon atoms represented by R include a linear, branched or alicyclic, saturated or unsaturated aliphatic hydrocarbon group, and the like.
For example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, amyl group, neopentyl group, hexyl group, heptyl group, octyl group, nonyl Group,
Decyl group, undecyl group, dodecyl group, tridecyl group,
Tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henycosyl group, docosyl group, tricosyl group, tetracosyl group, vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, octadecenyl And cyclohexyl groups. The aromatic hydrocarbon group having 6 to 24 carbon atoms represented by R may be a group consisting of only an aromatic ring or a group in which an aliphatic hydrocarbon group is bonded to the aromatic ring. Examples of such an aromatic hydrocarbon group include, for example, a phenyl group, a tolyl group, a xylyl group, a cumenyl group, a medityl group, a butylphenyl group, an octylphenyl group, a nonylphenyl group, a naphthyl group, a benzyl group, a diphenylmethyl group, Cinnamyl group,
Examples include a phenethyl group and a styryl group. One of these nonionic surfactants can be used alone, or two or more can be used in combination.
By using these nonionic surfactants, when the papermaking felt detergent of the present invention is diluted with water, d-
Limonene is emulsified or solubilized in water to form fine micelles, and exhibits excellent detergency.

In the felt detergent for papermaking of the present invention, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, butylene glycol and the like are used for the purpose of adjusting the viscosity of the product and improving the stability. Glycols can be blended. Also,
As long as the effects of the present invention are not impaired, water, a solvent, an acid or an alkali can be added. In the felt detergent for papermaking of the present invention, the detergency can be enhanced by using various builders in combination. Examples of such a builder include phosphorus such as trisodium phosphate, sodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium pyrophosphate, sodium dihydrogen pyrophosphate, sodium tripolyphosphate, sodium trimetaphosphate, and sodium hexametaphosphate. Sodium silicates, sodium silicate, sodium sulfate, alkali compounds such as sodium carbonate, nitrilotriacetic acid, ethylenediaminetetraacetic acid,
Aminocarboxylic acids such as diethylenetriaminepentaacetic acid (or their sodium salts), sodium carboxylate such as sodium citrate, sodium maleate, sodium gluconate, sodium acetate, sodium adipate, sodium oxydiacetate, and glycerin citrate , Polycarboxylic acid esters such as citric acid glycol ester, cyclic polycarboxylic acids such as tetrahydrofurantetracarboxylic acid, cyclopentanetetracarboxylic acid, benzenehexacarboxylic acid, benzenetetracarboxylic acid, sodium polymaleate, sodium polyacrylate And polyelectrolytes such as polystyrene-sodium maleate and polyvinyl methyl ether-sodium maleate. Among these builders, sodium phosphates, alkali polycarboxylic acids and polymer electrolytes can be particularly preferably used. These builders are generally used in an amount of 10 to 250 parts by weight based on 100 parts by weight of the nonionic surfactant. The felt cleaning agent of the present invention is usually
By diluting with water, it is used as an aqueous solution in which the concentration of the total amount of d-limonene and the nonionic surfactant is 0.01 to 1% by weight.

[0008]

The micelles obtained by emulsifying or solubilizing d-limonene, which is an oil-soluble solvent, with a nonionic surfactant are quickly adsorbed on the fiber surface of the papermaking felt and on the oily pitch in the inside thereof, and have good oily pitch. The uniformity of the attachment pitch in the fiber is achieved by the excellent compatibility. Furthermore, by the emulsifying action of the compounded nonionic surfactant, the homogenized d-limonene-oily pitch mixture is detached from the fiber and emulsified or solubilized in water, so that the felt is always kept in a clean state. Can be kept.

[0009]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. The cleaning method and the evaluation method in the examples are shown below. Cleaning method Used contaminated felt used in the actual machine, or
A circular sample is prepared by cutting the felt on which the artificial pitch has been spotted according to a Nutsche having a diameter of 70 mm. In Examples 1 to 7, 9 to 11 and Comparative Examples 1 and 2,
1500 ml of an aqueous solution having a detergent concentration of 0.3% by weight is prepared. A 70 mm diameter nutchee is attached to the suction bottle, a sample is placed on the nutchee, and an aqueous solution of the detergent is showered from above at a speed of 14.3 ml / min. (However, in Example 8, after immersing the sample in the detergent solution for 10 seconds, the sample is placed on the Nutsche and aspirated.)
Washing is carried out in the same manner using 000 ml of water. While showering the aqueous solution of cleaning agent and water, always aspirate by aspirator and keep the inside of the suction bottle at reduced pressure. The artificial pitch is a mixture of 15 parts of tall oil, 15 parts of rosin glyceride, and 70 parts of acetone. Detergency evaluation method a. Spot-removability Sample: Felt spotted with artificial pitch The felt washed by the above washing method is stained under the following conditions, and evaluated by the series based on the difference in stainability (shading difference) between the spot part and the unspotted part. I do. 1: The artificial pitch is completely removed 2: The artificial pitch is almost removed 3: A little artificial pitch remains 4: A lot of artificial pitch remains 5: The artificial pitch is not removed at all , The good one in the same class is indicated by + on the right shoulder of the number.
Poor ones are indicated by-. (Staining conditions) Kayanol Milling Brown 4GW
1% o. w. f. Bath ratio = 1: 40 pH = 550 ° C. × 1 minute b. Residual contamination rate Sample: Used contaminated felt used in the actual machine After drying the felt washed by the above-mentioned washing method, ethanol / benzene (volume ratio 1/2) was used as an extraction solvent, and a Soxhlet extraction device was used. Extract for 4 hours using
The residual contamination rate (% by weight) is determined by the following formula. Residual soil rate = (weight of extract / weight of felt before extraction) × 100 As a sample for evaluating water permeability, a used soiled felt used in an actual machine is uniformly impregnated with artificial pitch (based on 30% by weight of sample).
Then, the air-dried one was washed by the above-described washing method, and then air-dried. Next, the felt was placed in a 70 mm diameter 2
Overlaid with 0 mesh stainless steel wire mesh, inner diameter 50m
m, fixed to the bottom of a cylindrical metal frame with a height of 300 mm,
500 ml of water was poured into the cylinder, and the time required for the water to pass through a circular felt surface having a diameter of 50 mm was measured. Examples 1 to 6 and Comparative Examples 1 to 4 Table 1 shows the composition of the felt cleaner for papermaking used in Examples 1 to 6 and Comparative Examples 1, 3, and 4. Using these cleaning agents, the spot removability, the residual contamination rate, and the water permeability were evaluated. Further, as Comparative Example 2, washing was performed using only water without using a detergent, and similarly, the spot removability, the residual contamination rate, and the water permeability were evaluated. Table 2 shows the evaluation results.

[0010]

[Table 1]

[Note] 1) Nonylphenol ethylene oxide 9 mol adduct 2) C12-14 secondary alcohol ethylene oxide 7 mol adduct 3) Stearyl alcohol ethylene oxide 12 mol propylene oxide 3 mol block adduct 4) Stearylamine 5) Sodium salt of lauryl sulfate

[0012]

[Table 2]

When the felt cleaner for papermaking containing d-limonene and a nonionic surfactant in Examples 1 to 6 was used, the artificial pitch was almost removed, the residual soiling rate was low, and the water permeability was low. Good. On the other hand, in Comparative Example 1 which contained only nonionic surfactant and did not contain d-limonene, a large amount of artificial pitch remained, the residual soiling ratio exceeded 3%, and the time required for permeation of 500 ml of water was increased. More than twice as much as Comparative Example 4 using only d-limonene has intermediate performance between Examples 1 to 6 and Comparative Example 1. In Comparative Example 2 which was washed only with water, the spot removal property, the residual contamination rate,
All of the permeability is even worse. Examples 7 to 8, Comparative Example 5 Sodium tripolyphosphate as a builder was added to each of 0.3% by weight aqueous solutions of the felt cleaning agents for papermaking of Examples 1, 5 and Comparative Example 3 so as to be 0.06% by weight. Then, the spot removal property, the residual soil rate and the water permeability were measured. Table 3 shows the evaluation results. Comparative Example 5, which does not use a nonionic surfactant in combination, is inferior in performance.

[0014]

[Table 3]

By adding sodium tripolyphosphate,
It can be seen that all the performances have been further improved.

[0016]

According to the paper felt cleaning agent containing d-limonene and the nonionic surfactant of the present invention, the dirt adhering to the felt is efficiently removed, and the good water squeezing property of the paper felt is improved. Can be retained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C11D 1/74 C11D 1/74 10/02 10/02 (56) References JP 5-320694 (JP, A) JP JP-A-58-215500 (JP, A) JP-A-4-127957 (JP, A) JP-A-4-130199 (JP, A) JP-A-58-91886 (JP, A) JP-A-1-272700 (JP) , A) JP-A-61-85496 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C11D 1/00-17/08

Claims (1)

(57) [Claims] 1. d-limonene and the following general formulas [1] to
Selected from the group of nonionic surfactants represented by [4]
At least one nonionic surfactant, d-limonene;
And the weight ratio of nonionic surfactant to 5:95 to 40:60
Felt detergent for papermaking, characterized in that it is contained in such an amount as to give the following ratio: RO (AO) _n H [1] Embedded image Embedded image (Wherein, R represents a hydrogen atom, an aliphatic hydrocarbon group, or an aromatic hydrocarbon group, and AO represents at least one oxyalkylene group selected from an oxyethylene group, an oxypropylene group, and an oxybutylene group. Represents a single adduct thereof, or, in the case of two or more, a block adduct,
Any of random adducts may be formed, and I + m
Is 1 to 200, and n is 1 to 200. However,
When R in the general formula [1] is a hydrogen atom, n is 5 to 2
00. )