JP6948204B2 - Laundry finish and washing method - Google Patents

Description

The present invention relates to a laundry finish and a washing method.

When washing using various washing machines, each step is generally performed in the order of a washing step, a rinsing step, and a finishing step (Patent Document 1). In the finishing step, a laundry finishing agent containing a cationic surfactant as a main component is used for the purpose of giving flexibility to the object to be washed such as linen and clothes (Patent Document 2).

Japanese Unexamined Patent Publication No. 2010-21402 Japanese Unexamined Patent Publication No. 2017-89068

For example, in the washing step, alkaline washing water is used for the object to be washed, so that it is necessary to lower the pH of the object to be washed in the rinsing step and the finishing step performed after the washing step.

In particular, when a commercial washing machine such as a continuous washing machine is used, the washing process is often shifted to the rinsing process and the finishing process without undergoing dehydration. That is, the object to be washed is carried to the next step in a state of containing a large amount of washing water used in the washing step. Further, in a commercial washing machine, washing water having a high pH that is not used in ordinary households is used. Therefore, from the viewpoint of sufficiently lowering the pH of the object to be washed, it is preferable that the pH of the laundry finish is sufficiently lower than that used at home.

However, if the pH of a general laundry finish containing a cationic surfactant is lowered, there is a problem that the viscosity of the laundry finish becomes high and the workability deteriorates. Further, in a commercial washing machine, the washing finish agent is often supplied into the tub by a pump, so that there is a problem that the load on the pump increases when the viscosity of the washing finish agent is high.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laundry finish having a low pH while suppressing an increase in viscosity, and a washing method using the laundry finish. be.

As a result of diligent studies to solve the above problems, the inventors of the present invention have found that the above problems can be solved by using a certain material, and have completed the present invention.

That is, the laundry finishing agent of the present invention, a quaternized product of trialkanolamine fatty acid ester (X), a polycarboxylic acid compound and only including (Y), quaternary products of trialkanolamine fatty acid ester (X) poly The mass ratio ((X) / (Y)) with the carboxylic acid (Y) is 0.1 to 5.

According to the present invention, the pH can be lowered while suppressing an increase in the viscosity of the laundry finish.

First, the contents of the embodiments of the present invention are listed.

(1) The laundry finishing agent according to the embodiment of the present invention contains a quaternary product (X) of a trialkanolamine fatty acid ester and a polycarboxylic acid (Y). With such a configuration, a laundry finish having a low pH and a low viscosity can be obtained.

(2) Preferably, the laundry finish has a pH of 1 to 3. With such a configuration, the pH of the object to be washed can be easily lowered.

(3) Preferably, the laundry finish is a laundry finish for commercial washing machines in which washing water having a pH of 10 to 11 is used. With such a configuration, it is possible to finish the object to be washed at a suitable pH in a situation where high pH washing water is used as in the case where a cleaning company uses a commercial washing machine for washing.

(4) The washing method according to the embodiment of the present invention includes a washing step using washing water having a pH of 10 to 11 and a washing finish containing a quaternized product (X) of a trialkanolamine fatty acid ester and a polycarboxylic acid (Y). Includes a finishing step using an agent. According to such a method, the object to be washed can be finished to a suitable pH in a situation where high pH washing water is used as in the case where a cleaning company uses a commercial washing machine for washing.

Hereinafter, embodiments of the present invention will be described in detail.

The laundry finish in this embodiment contains a quaternary product (X) of a trialkanolamine fatty acid ester and a polycarboxylic acid (Y).

The quaternized product (X) of the trialkanolamine fatty acid ester can be obtained, for example, by quaternizing the ester of the trialkanolamine and the fatty acid with an alkylating agent.

The trialkanolamine is not particularly limited, and examples thereof include triethanolamine, triisopropanolamine, tri (2-butanol) amine, and tri (t-butanol) amine. As the trialkanolamine, triethanolamine is preferable from the viewpoint of suppressing the viscosity even when the pH of the laundry finish is lowered.

The fatty acid is not particularly limited, but a saturated fatty acid having 10 to 26 carbon atoms or an unsaturated fatty acid having 10 to 22 carbon atoms is preferable.

Examples of saturated fatty acids having 10 to 26 carbon atoms include saturated fatty acids having 10 carbon atoms such as decanoic acid (capric acid), saturated fatty acids having 12 carbon atoms such as dodecanoic acid (lauric acid), and 13 carbon atoms such as tridecanoic acid. Saturated fatty acid, saturated fatty acid with 14 carbon atoms such as tetradecanoic acid (myristic acid), discordant fatty acid with 15 carbon atoms such as pentadecanoic acid (pentadecolic acid), saturated fatty acid with 16 carbon atoms such as hexadecanoic acid (palmitic acid), Saturated fatty acids with 17 carbon atoms such as heptadecanoic acid (margaric acid), saturated fatty acids with 18 carbon atoms such as octadecanoic acid (stearic acid), saturated fatty acids with 19 carbon atoms such as nonadecanoic acid, and carbons such as eicosanoic acid (arachidic acid). Saturated fatty acid of 20s, saturated fatty acid of 22 carbons such as docosanoic acid (bechenic acid), saturated fatty acid of 24 carbons such as tetracosanoic acid (lignoseric acid), saturated fatty acid of 26 carbons such as hexacosanoic acid (serotinic acid) Can be mentioned. Of these, saturated fatty acids having 10 to 20 carbon atoms are particularly preferable from the viewpoint of suppressing the viscosity even when the pH of the laundry finish is lowered.

Examples of unsaturated fatty acids having 12 to 22 carbon atoms include unsaturated fatty acids having 12 carbon atoms such as dodecenoic acid, unsaturated fatty acids having 13 carbon atoms such as tridecenoic acid, and unsaturated fatty acids having 14 carbon atoms such as tetradecenoic acid. , Pentadecenoic acid and other 15-carbon unsaturated fatty acids, hexadecenoic acid (palmitoleic acid, etc.) and other 16-carbon unsaturated fatty acids, heptadecenoic acid and other 17-carbon unsaturated fatty acids, octadecenoic acid (oleic acid, buxenoic acid, etc.) Etc.), octadecadienoic acid (linoleic acid, etc.), octadecatrienoic acid ((9,12,15) -linolenic acid, 6,9,12) -linolenic acid, eleostearic acid, etc. 18 carbon atoms Unsaturated fatty acids, unsaturated fatty acids with 19 carbon atoms such as nonadecenoic acid, Eikosadienoic acid (8,11-Eikosadienoic acid, etc.), Eikosatrienoic acid (5,8,11-Eikosatrienoic acid, etc.), Eikosatetra Examples thereof include unsaturated fatty acids having 20 carbon atoms such as enoic acid (arachidonic acid and the like). Of these, unsaturated fatty acids having 16 to 18 carbon atoms are particularly preferable from the viewpoint of suppressing the viscosity even when the pH of the laundry finish is lowered.

The alkylating agent is not particularly limited, and generally includes alkyl halides such as methyl chloride, ethyl chloride, methyl bromide, and methyl iodide, and alkyl sulfates such as dimethyl sulfate, diethyl sulfate, and gyn-propyl sulfuric acid. Alkylating agent can be mentioned. As the alkylating agent, dimethyl sulfate is preferable from the viewpoint of suppressing the viscosity even when the pH of the laundry finish is lowered.

The polycarboxylic acid (Y) is not particularly limited, and examples thereof include succinic acid, adipic acid, sebacic acid, dodecandicarboxylic acid, azelaic acid, citric acid, malic acid, and agaric acid. As the polycarboxylic acid (Y), citric acid or malic acid is preferable from the viewpoint of suppressing the viscosity even when the pH of the laundry finishing agent is lowered.

The quaternary product (X) of the trialkanolamine fatty acid ester is represented by the compound represented by the following general formula (1) and the following general formula (2) from the viewpoint of suppressing the viscosity even when the pH of the laundry finish is lowered. It is particularly preferred to include at least one compound selected from the group consisting of compounds.

However, in the general formula (1), R ¹ represents a saturated hydrocarbon group having 16 to 18 carbon atoms or an unsaturated hydrocarbon group having 18 carbon atoms.

Further, in the general formula (2), R ² represents a saturated hydrocarbon group having 10 to 20 carbon atoms or an unsaturated hydrocarbon group having 16 to 18 carbon atoms. ^{Each R 2} in the general formula (2) may be different from each other or may be the same.

In the laundry finish according to the present embodiment, from the viewpoint of suppressing the viscosity even when the pH of the laundry finish is lowered, 5 quaternized products (X) of trialkanolamine fatty acid ester are added to 100 parts by mass of the laundry finish. It preferably contains ~ 25 parts by mass, more preferably 8 to 20 parts by mass, and even more preferably 8 to 15 parts by mass.

The mass ratio ((X) / (Y)) of the quaternary product (X) of the trialkanolamine fatty acid ester to the polycarboxylic acid (Y) contained in the laundry finish according to the present embodiment is the mass ratio of the laundry finish. From the viewpoint of suppressing the viscosity even when the pH is lowered, 0.1 to 5 is preferable, 0.2 to 4 is more preferable, and 0.3 to 3.5 is further preferable.

Various materials added to general laundry finishes such as fiber lubricants such as silicone compounds, antibacterial agents, fragrances and antifoaming agents can be added to the laundry finishes according to the present embodiment.

The washing finish agent according to the embodiment of the present invention is preferably used in a commercial washing machine in which the washing process is performed with washing water having a high pH, and more preferably used in a continuous washing machine.

In the continuous washing machine, the washing step, the rinsing step, and the finishing step are performed in this order, and then the object to be washed is dehydrated by the dehydrator. The washing step includes, for example, a pre-washing step and a main washing step.

The continuous washing machine includes, for example, a plurality of tubs arranged in a row (here, the first tub to the thirteenth tub), and each step is performed using these the plurality of tubs in order. Specifically, for example, the first tank and the second tank are used in the prewashing step, the third to ninth tanks are used in the main washing step, and the tenth to twelfth tanks are used in the rinsing step. The thirteenth tank is used in the finishing process. The object to be washed put into the continuous washing machine is sent from the first tub to the adjacent tubs in order, and reaches the thirteenth tub through each step.

Detergent and bleach are added to any of the tanks where the main washing process is performed. The object to be washed is washed with a liquid in which the detergent and bleach are diluted with water, that is, wash water. The pH of the washing water is 10 to 11. The pH is higher than that of washing water used in ordinary household washing machines. It should be noted that the bleaching agent may not be added.

Fresh water, or water, is supplied to any of the tanks where the rinsing process takes place. In addition, the washing water moves from the adjacent tank together with the object to be washed to the tank where the rinsing process is performed. The rinsing step reduces the pH of the liquid contained in the object to be washed to 9-7. That is, the object to be washed having a pH of 9 to 7 moves to the thirteenth tank where the finishing process is performed.

The washing finishing agent according to the embodiment of the present invention is put into the thirteenth tank in which the finishing step is performed. The laundry finish according to the embodiment of the present invention has, for example, a pH of 1-3. Thereby, the pH of the liquid in the thirteenth tank can be easily adjusted to 6 to 7, which is close to the pH of human skin.

Here, the pH of the object to be washed moving to the thirteenth tank is 9 to 7, but it may be higher.

<Example>
Hereinafter, the laundry finishing agent of the present embodiment will be described in more detail based on Examples and Comparative Examples. The present invention is not limited thereto. In addition, "parts" and "%" in this specification represent "parts by mass" and "% by mass", respectively, unless otherwise specified.

The materials used in Examples and Comparative Examples are shown.
Cationic Surfactant Trialkanolamine Fatty Acid Ester Quadruple (X)
A quaternized product of triethanolamine fatty acid ester (X-1)
(Product name: REWOQUAT WE28 SH, manufactured by EVONIK, compound of the above general formula (2))
A quaternized product of triethanolamine fatty acid ester (X-2)
(Product name: REWOQUAT WE28 EUS, manufactured by EVONIK, compound of the above general formula (1))
Other Cationic Surfactants (A)
・ Distearyldimethylammonium chloride (A-1)
(Product name: Kotamin D86P made by Kao Corporation)
-Trioxyethylene methylammonium salt methylsulfate (trade name: Lion Softer EQ, manufactured by Lion) (A-2)
-Dimethylaminopropylamide stearate (A-3)
(Product name: Parner SDPA-4B, manufactured by Miyoshi Oil & Fat Co., Ltd.)
Polycarboxylic acid (Y)
-Citric acid (Y-1)
・ Malic acid (Y-2)

Table 1 shows the materials used for production, the blending amounts thereof (numerical values are parts by mass), the pH, and the results of each evaluation for each of the laundry finishes of Examples 1 to 8 and Comparative Examples 1 to 3. show.

(Manufacturing of laundry finish)
The materials listed in Table 1 are mixed at 60 ° C. until the cationic surfactant is completely dissolved. The viscosity and defoaming power of the laundry finish produced in this manner are evaluated.

(viscosity)
The viscosity was measured by measuring the laundry finish adjusted to 20 ° C. using a BM type viscometer (rotor No. 2, rotation speed 60 rpm) according to JIS Z8803.

(Defoaming power) The defoaming power is an index showing the degree of suppressing the foaming of a foaming liquid. The defoaming power is measured by the following procedure. That is, 0.1 g of the nonionic surfactant Neugen LP-180 (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) is dissolved in 100 ml of water at 40 ° C. and gently poured into a 500 ml graduated cylinder without foaming. Next, 0.05 g of the laundry finishing agent is put into the measuring cylinder. Next, an air pump and a diffuser stone are used to blow air into the liquid in the graduated cylinder for 30 seconds to attempt to foam the liquid. Next, turn off the air pump and measure the amount of foam immediately after. Specifically, the amount of foam is measured based on the scale near the upper end of the foam and the scale near the lower end of the foam in the measuring cylinder. As the laundry finish, from the viewpoint of handleability of the object to be washed, the higher the defoaming power, that is, the smaller the amount of foam, the more preferable. The evaluation criteria are shown below.
A: The amount of foam is 100 ml or less
B: The amount of foam exceeds 100 ml and 300 ml or less
C: The amount of foam exceeds 300 ml

As is clear from Table 1, it can be seen that the laundry finishes of Examples 1 to 8 have lower viscosities than Comparative Examples 2 and 3 even though the pH is low. Further, it can be seen that the laundry finishes of Examples 1 to 8 have a lower pH and a higher defoaming power than those of Comparative Example 1.

Claims (4)

Quaternized products of trialkanolamine fatty acid ester (X), and a polycarboxylic acid (Y) seen including,
A laundry finish having a mass ratio ((X) / (Y)) of a quaternized product (X) of a trialkanolamine fatty acid ester to a polycarboxylic acid (Y) of 0.1 to 5. The laundry finishing agent according to claim 1, which has a pH of 1 to 3. The laundry finishing agent according to claim 1 or 2, which is a washing finishing agent for a commercial washing machine in which washing water having a pH of 10 to 11 is used. a washing step using a washing water pH 10-11, quaternary products of trialkanolamine fatty ester (X) and polycarboxylic acid (Y) viewing including, quaternized product (X) and polycarboxylic of trialkanolamine fatty acid ester A washing method comprising a finishing step using a washing finishing agent having a mass ratio ((X) / (Y)) of acid (Y) of 0.1 to 5.