JP6674973B2 - Cleaning agent and cleaning method - Google Patents

Description

  The present invention relates to a cleaning agent and a cleaning method.

  BACKGROUND ART Conventionally, various cleaning agents have been used for textile products. For example, Patent Literature 1 describes a cleaning agent that promotes removal of stains from fabric under home laundry conditions.

  On the other hand, conventionally, for example, a mat for dust control may be laid at entrances and the like of rooms such as hospitals, restaurants, factories, and the like in order to suppress diffusion of dirt attached to shoes and the like. In addition, mop and the like are used to remove dirt from rooms and passages.

  Since such mats and mops are used for the purpose of absorbing dirt, a large amount of dirt adheres to them, which is incomparable with general clothing and the like used at home. Further, even in working clothes used in hospitals, restaurants, factories, and the like, when oil or alcohol is used for business, more dirt adheres than ordinary clothes. Then, in order to remove such dirt, a cleaning method and a cleaning machine that exhibit a cleaning effect more are used.

  Therefore, a cleaning agent used for fibers with a large amount of dirt attached thereto, such as mats, mops, and work clothes, is required to have superior cleaning performance as compared with household cleaning agents. The cleaning method and the cleaning machine used are also designed to exhibit the cleaning ability of such a cleaning agent.

JP 2014-518923 A

  As described above, a cleaning agent used for fibers having a large amount of dirt attached thereto, such as a mat, a mop, and work clothes, is required to have excellent cleaning performance as compared with a household cleaning agent.

  However, synthetic fibers such as polyester fibers have a problem that recontamination is likely to occur due to washing. That is, if the synthetic fiber with a large degree of soiling and the synthetic fiber with a small degree of soiling are washed together, there is a problem that the soil of the synthetic fiber with a large degree of soiling is easily transferred to the synthetic fiber with a small degree of soiling.

  Further, high water absorption is required for mats, mops, work clothes, and the like, but there is a problem that the conventional cleaning agent reduces the water absorption of synthetic fibers by washing.

  Under such circumstances, the present invention provides a synthetic fiber cleaning agent that can suppress recontamination of synthetic fibers due to washing at high temperatures and can impart excellent water absorption to synthetic fibers. The main purpose is. Another object of the present invention is to provide a method for cleaning synthetic fibers using the cleaning agent.

  The present inventors have conducted intensive studies in order to solve the above problems. As a result, a detergent for synthetic fibers, wherein the detergent contains hydroxypropylmethylcellulose, and the weight average molecular weight of the hydroxypropylmethylcellulose is at least 20,000 and less than 100,000, It has been found that recontamination of synthetic fibers due to washing at a temperature higher than ℃ is suppressed, and that excellent water absorbency can be imparted to the synthetic fibers. The present invention has been completed by further study based on these findings.

That is, the present invention provides the following aspects of the invention.
Item 1. A synthetic fiber cleaning agent,
The cleaning agent comprises hydroxypropyl methylcellulose,
A synthetic fiber detergent, wherein the hydroxypropyl methylcellulose has a weight average molecular weight of 20,000 or more and less than 100,000.
Item 2. Item 2. The synthetic fiber detergent according to Item 1, wherein the ratio of hydroxypropoxyl groups in the hydroxypropyl methylcellulose is 3 to 15% by mass.
Item 3. Item 3. The synthetic fiber detergent according to item 1 or 2, wherein the ratio of the methoxyl group of the hydroxypropyl methylcellulose is 25 to 32% by mass.
Item 4. Item 4. The synthetic fiber detergent according to any one of Items 1 to 3, wherein the hydroxypropyl methylcellulose has a degree of methoxyl group substitution of 1.7 to 2.0.
Item 5. Item 5. The synthetic fiber cleaning agent according to any one of Items 1 to 4, which is used at a cleaning temperature higher than 40 ° C.
Item 6. Item 6. The synthetic fiber cleaning agent according to any one of Items 1 to 5, wherein the synthetic fiber to be cleaned includes at least one of a polyester fiber, an acrylic fiber, and a nylon fiber.
Item 7. Item 7. The synthetic fiber cleaning agent according to any one of Items 1 to 6.
Item 8. A washing step of mixing the detergent according to any one of items 1 to 7, synthetic fiber, and water and washing at a temperature higher than 40 ° C;
After the washing step, a step of rinsing the synthetic fibers with rinsing water,
A method for cleaning synthetic fibers, comprising:

  ADVANTAGE OF THE INVENTION According to this invention, the synthetic fiber cleaning agent which can suppress the re-contamination of a synthetic fiber in washing | cleaning under high temperature, and can also provide excellent water absorption to a synthetic fiber can be provided. Furthermore, according to the present invention, a method for cleaning synthetic fibers using the cleaning agent can be provided.

1. Detergent The detergent of the present invention is used for cleaning synthetic fibers, and includes hydroxypropylmethylcellulose, wherein the weight average molecular weight of hydroxypropylmethylcellulose is 20,000 or more and less than 100,000. . The cleaning agent of the present invention having such a configuration can suppress re-contamination of synthetic fibers due to washing, and can impart excellent water absorption to the synthetic fibers. Hereinafter, the cleaning agent of the present invention will be described in detail.

  As described below, the cleaning agent of the present invention is used for cleaning synthetic fibers, but can also be used for cleaning natural fibers together with synthetic fibers. Further, it may be used for washing natural fibers containing no synthetic fibers.

  The cleaning agent of the present invention contains hydroxypropyl methylcellulose. In the present invention, the weight average molecular weight of hydroxypropyl methylcellulose is 20,000 or more and less than 100,000. In the cleaning agent of the present invention, since the weight average molecular weight of hydroxypropyl methylcellulose is within the range, it is possible to impart excellent water absorption to the synthetic fibers while suppressing recontamination of the synthetic fibers by washing. Become.

  The weight average molecular weight of hydroxypropyl methylcellulose may be within the above range, but from the viewpoint of effectively suppressing recontamination of synthetic fibers by washing, from the viewpoint of imparting more excellent water absorption to synthetic fibers. The lower limit is preferably 30,000 or more, more preferably 50,000 or more, and the upper limit is preferably 90,000 or less, more preferably 80,000 or less.

  The ratio of hydroxypropoxyl groups in hydroxypropylmethylcellulose is not particularly limited, but from the viewpoint of effectively suppressing recontamination of synthetic fibers due to washing, from the viewpoint of imparting more excellent water absorption to synthetic fibers. The lower limit is preferably 3% by mass or more, more preferably 4% by mass or more, and still more preferably 7% by mass or more. The upper limit is preferably 15% by mass or less, more preferably 13% by mass or less. More preferably, the content is 12% by mass or less.

  Further, the ratio of the methoxyl group of hydroxypropyl methylcellulose is not particularly limited, but from the viewpoint of further suppressing the recontamination of the synthetic fiber by washing, and from the viewpoint of imparting more excellent water absorption to the synthetic fiber, the lower limit. About 25% by mass or more, more preferably 27% by mass or more, further preferably 28% by mass or more, and the upper limit is preferably about 32% by mass or less, more preferably 30% by mass or less. Can be

  Furthermore, the degree of methoxyl group substitution of hydroxypropyl methylcellulose is not particularly limited, but from the viewpoint of further suppressing the recontamination of synthetic fibers by washing, and from the viewpoint of imparting more excellent water absorption to the synthetic fibers, the lower limit. Is preferably 1.7 or more, more preferably 1.8 or more, and the upper limit is preferably 2.0 or less. The “degree of methoxyl group substitution” of hydroxypropyl methylcellulose means the average number of hydroxyl groups substituted with methoxyl groups per glucose ring unit of cellulose.

  In the cleaning agent of the present invention, hydroxypropyl methylcellulose has a weight average molecular weight of 20,000 or more and less than 100,000, a hydroxypropoxyl group ratio of about 3 to 15% by mass, and a methoxyl group ratio of 25 to 32% by mass. %, More preferably a degree of methoxyl group substitution of about 1.7 to 2.0; a weight average molecular weight of about 30,000 to 90,000, and a ratio of hydroxypropoxyl group of 4 to 13% by mass. And a methoxyl group ratio of about 27 to 30% by mass, and more preferably a methoxyl group substitution degree of about 1.8 to 2.0; and a weight average molecular weight of about 50,000 to 90,000. The proportion of hydroxypropoxyl groups is about 7 to 12% by mass, the proportion of methoxyl groups is about 28 to 30% by mass, and the degree of methoxyl group substitution is 1.8. It is more preferably about 2.0; the weight average molecular weight is about 50,000 to 80,000, the proportion of hydroxypropoxyl groups is about 7 to 12% by mass, and the proportion of methoxyl groups is 28 to 30% by mass. And a methoxyl group substitution degree of about 1.9 to 2.0 is particularly preferable.

  In the present invention, the weight average molecular weight of hydroxypropyl methylcellulose is a value measured by gel permeation chromatography (GPC method) using standard polystyrene.

<Method for calculating molecular weight>
The molecular weight of hydroxypropyl methylcellulose can be measured by gel filtration chromatography (GPC) -multi-angle laser light scattering detector (MALLS) system. (For example, as a device, a liquid sending pump: Shodex DS-4 (manufactured by Showa Denko), a degasser: ERC3115 (manufactured by ERC), a column: Shodex SB-806MHQ (manufactured by Showa Denko), and a light scattering detector: DOWN (Wyat Technology) And a concentration detector: Shodex RI-71 (manufactured by Showa Denko) under the following operating conditions: eluent: 0.1 M NaNO ₃ 1.0 ml / min, sample: 0.02 to 0 0.3% by weight of the solvent can be used with a 0.1 M NaNO ₃ injection amount: 200 μm.)

  In the cleaning agent of the present invention, the content (solid content) of hydroxypropylmethylcellulose is not particularly limited, but it has excellent water absorption for synthetic fibers while effectively suppressing recontamination of synthetic fibers by washing. From the viewpoint of providing, the lower limit is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, further preferably 0.08% by mass or more, and the upper limit is preferably 15% by mass. Or less, more preferably 10% by mass or less, and 8% by mass or less.

  The cleaning agent of the present invention may contain known cleaning components, cleaning aids, and other additives in addition to the above-mentioned hydroxypropyl methylcellulose.

  The washing component is not particularly limited, but preferably includes an alkali agent (alkali component), a surfactant, and the like. As the cleaning component, only one type may be used, or two or more types may be mixed and used.

  As the alkaline agent, those incorporated in known fiber detergents can be used and are not particularly limited. For example, sodium carbonate, potassium carbonate, sodium bicarbonate, sodium sulfite, sodium sesquicarbonate, sodium silicate, crystalline layer Examples thereof include alkaline salts such as sodium silicate and amorphous layered sodium silicate. More preferably, they are sodium carbonate and sodium silicate, and only one alkali agent may be used, or two or more alkali agents may be used in combination.

  When the cleaning agent of the present invention contains an alkaline agent, the content thereof is not particularly limited, but imparts excellent water absorption to the synthetic fibers while effectively suppressing recontamination of the synthetic fibers by washing. From the viewpoint of the lower limit, the lower limit is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 65% by mass or more, and the upper limit is preferably 90% by mass or less, more preferably 85% by mass. %, More preferably 80% by mass or less.

  In addition, as the surfactant, a surfactant that is blended with a known fiber detergent can be used, and for example, an anionic surfactant, a nonionic surfactant, and the like are preferable.

  Examples of the anionic surfactant include linear alkylbenzenesulfonic acid or a salt thereof, α-olefinsulfonic acid salt, linear or branched alkylsulfate, alkylether sulfate or alkenylether sulfate, and alkane sulfone. Acid salts, sulfonate type or sulfate ester type anionic surfactants such as α-sulfofatty acid ester salts, fatty acids, alkyl ether carboxylic acids, polyoxyalkylene ether carboxylic acids, alkyl (or alkenyl) amide ether carboxylic acids, Carboxylic acid type anionic surfactants such as acylaminocarboxylic acids or salts thereof, alkyl phosphate salts, polyoxyalkylene alkyl phosphate salts, polyoxyalkylene alkyl phenyl phosphate salts, glycerin fatty acids Examples thereof include phosphate ester type anionic surfactants such as ester monophosphate salts. Examples of these salts include alkali metal salts such as sodium and potassium, alkaline earth metal salts such as magnesium, and alkanolamine salts such as monoethanolamine salt and diethanolamine salt. More preferred are linear alkylbenzene sulfonic acids or salts thereof, α-olefin sulfonates, linear or branched alkyl sulfates, alkane sulfonates, α-sulfofatty acid esters, fatty acids and salts thereof.

  Among these anionic surfactants, the straight-chain alkylbenzene sulfonic acid or a salt thereof preferably has a straight-chain alkyl group having 8 to 16 carbon atoms, and particularly preferably has 10 to 14 carbon atoms. As the α-olefin sulfonate, those having 10 to 20 carbon atoms are preferable. The alkyl sulfate salt preferably has 10 to 20 carbon atoms. As the alkyl ether sulfate or the alkenyl ether sulfate, a polyoxyalkylene alkyl ether sulfate or a polyoxyalkylene alkenyl ether sulfate is preferable, and a linear or branched alkyl group or alkenyl having 10 to 20 carbon atoms. Polyoxyalkylene alkyl ether sulfate or polyoxyalkylene alkenyl having a group and having an average of 1 to 5 moles of alkylene oxide added thereto (for example, at least one alkylene oxide selected from the group consisting of ethylene oxide and propylene oxide). Ether sulfate salts are more preferred. As the alkane sulfonate, a secondary alkane sulfonate having an alkyl group having 10 to 20 carbon atoms, preferably 14 to 17 carbon atoms is preferable. As the α-sulfofatty acid ester salt, an α-sulfofatty acid ester salt having a fatty acid residue having 10 to 20 carbon atoms is preferable. As the fatty acid or a salt thereof, a fatty acid having 10 to 20 carbon atoms or a salt thereof is preferable.

  When the cleaning agent of the present invention contains an anionic surfactant, the content is not particularly limited, but while effectively suppressing recontamination of the synthetic fiber due to washing, excellent water absorption for the synthetic fiber. From the viewpoint of imparting, the lower limit is preferably 1% by mass or more, and the upper limit is preferably 20% by mass or less, more preferably 15% by mass or less, and further preferably 10% by mass or less.

  Examples of the nonionic surfactant include glycerin fatty acid esters (eg, glyceryl stearate, glyceryl oleate, etc.), sucrose fatty acid esters (eg, sucrose laurate ester, sucrose myristic acid ester, sucrose palmitate ester, etc.). ), Sorbitan fatty acid esters (eg, sorbitan laurate, sorbitan stearate, sorbitan isostearate); polyoxyethylene alkyl ethers (eg, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene) Ethylene isostearyl ether, etc.), polyoxyethylene alkyl phenyl ether (eg, polyoxyethylene nonyl phenyl ether, etc.), polyoxyethylene polyoxypropyl Ether-type surfactants such as pyrene glycol (eg, polyoxyethylene (160) polyoxypropylene (30) glycol, etc.), polyoxyethylene polyoxypropylene alkyl ether (eg, polyoxyethylene polyoxypropylene lauryl ether); fatty acids Polyethylene glycol (for example, polyethylene glycol stearate, polyethylene glycol dilaurate, etc.), fatty acid polyoxyethylene sorbitan (for example, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monooleate, etc.) Ester ether type surfactants; fatty acid alkanolamides (for example, coconut oil fatty acid diethanolamide, lauric acid diethyl ether) Alkanolamide-type surfactants such as thiolamide, stearic acid monoethanolamide and the like; alkyl glucoside-type surfactants such as decyl glucoside, lauryl glucoside and myristyl glucoside; octanoyl-N-methylglucamide, coconut oil fatty acid Acyl glucamide type surfactants such as acyl methyl glucamide and the like are exemplified. More preferably, it is a polyoxyethylene polyoxypropylene alkyl ether.

  When a nonionic surfactant is contained in the cleaning agent of the present invention, the content thereof is not particularly limited. However, while effectively suppressing recontamination of the synthetic fiber by washing, excellent water absorption for the synthetic fiber is achieved. From the viewpoint of imparting, the lower limit is preferably 5% by mass or more, more preferably 10% by mass or more, and the upper limit is preferably 30% by mass or less, more preferably 25% by mass or less, further more preferably 20% by mass or less.

  Examples of the cleaning aid include an organic builder, a dissolution promoter, an enzyme, a fluorescent brightener, a fragrance, a coloring agent, and the like, which are used in known fiber cleaning agents. A single cleaning aid may be used, or a mixture of two or more cleaning aids may be used.

  Organic builders include organic high molecular builders and organic low molecular builders. Examples of the organic polymer-based builder include acrylic acid-based polymer compounds, polyacetal carboxylate, itaconic acid, fumaric acid, tetramethylene-1,2-dicarboxylic acid, succinic acid, and polymers or copolymers of aspartic acid. No. Examples of the organic low-molecular builder include aminocarboxylates such as nitrilotriacetate, ethylenediaminetetraacetate, β-alanine diacetate, aspartate diacetate, methylglycine diacetate and iminodisuccinate; Hydroxyaminocarboxylates such as salts, hydroxyiminodisuccinates, hydroxyethylethylenediaminetriacetate, dihydroxyethylglycine; hydroxycarboxylates such as hydroxyacetate, tartrate, citrate, gluconate; pyro Cyclocarboxylates such as melitate, benzopolycarboxylate, and cyclopentanetetracarboxylate; ether carboxylates such as carboxymethyl tartronate, carboxymethyloxysuccinate, oxydisuccinate, and tartaric acid mono- or di-succinate Phosphate salts, and the like. As the organic builder, those used as a chelating agent having a chelating effect on inorganic ions are preferable. As such a chelating agent, methyl glycine diacetate such as trisodium methyl glycine diacetate is preferable. One type of organic builder may be used alone, or two or more types may be mixed and used.

  When the organic builder is contained in the cleaning agent of the present invention, the content thereof is not particularly limited, but imparts excellent water absorption to the synthetic fibers while effectively suppressing recontamination of the synthetic fibers by washing. From the viewpoint of the lower limit, the lower limit is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, further preferably 0.2% by mass or more, and the upper limit is preferably 10% by mass or less. , More preferably 8% by mass or less, further preferably 7% by mass or less.

  Examples of the dissolution promoter include potassium carbonate, inorganic sulfates such as ammonium sulfate and ammonium chloride, and short-chains having 1 to 5 carbon atoms such as sodium p-toluenesulfonate, sodium xylenesulfonate and sodium cumenesulfonate. Water-soluble substances such as alkyl-containing benzenesulfonate, sodium benzoate, sodium benzenesulfonate, sodium chloride, citric acid, D-glucose, urea, and sucrose are exemplified. Of these, potassium carbonate and sodium chloride are preferred. The dissolution promoter may be used alone or as a mixture of two or more.

  When the detergent of the present invention contains a dissolution promoter, the content thereof is not particularly limited, and the lower limit is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and still more preferably. 0.1% by mass or more, and the upper limit is preferably 20% by mass or less, more preferably 15% by mass or less, and further preferably 10% by mass or less.

  Other additives include fluorescent brighteners, fragrances, dyes, extenders, reducing agents, antistatic agents, enzymes, and the like, which are used in known fiber cleaning agents. Other additives may be used alone or in a combination of two or more. When other additives are contained in the detergent of the present invention, the content thereof is not particularly limited, and the lower limit is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and furthermore It is preferably 0.1% by mass or more, and the upper limit is preferably 20% by mass or less, more preferably 15% by mass or less, and further preferably 10% by mass or less.

  The form of the cleaning agent of the present invention is not particularly limited, but is preferably particulate from the viewpoint of storage stability and convenience.

  As described above, the cleaning agent of the present invention is used for cleaning synthetic fibers, but can also be used for cleaning natural fibers together with synthetic fibers. Further, it may be used for washing natural fibers containing no synthetic fibers.

  The synthetic fiber to be cleaned by the detergent of the present invention is not particularly limited as long as it is a synthetic fiber.In particular, when a synthetic fiber containing at least one of a polyester fiber, an acrylic fiber, and a nylon fiber is to be cleaned, the cleaning is performed. In particular, it is possible to effectively suppress the recontamination of the synthetic fiber due to the above, and to impart particularly excellent water absorption to the synthetic fiber. The synthetic fibers to be cleaned by the cleaning agent of the present invention are particularly preferably synthetic fibers including polyester fibers.

  The specific form of the synthetic fiber is not particularly limited, and examples thereof include a mat, a mop, a work clothes, a white coat, and an apron. The type of dirt to be cleaned by the cleaning agent of the present invention is not particularly limited, and examples thereof include oil dirt and mud dirt.

  The cleaning agent of the present invention can wash synthetic fibers by mixing them with water. The use amount of the detergent of the present invention is not particularly limited, but the lower limit is preferably 0.1 parts by mass or more, and the upper limit is preferably 30 parts by mass or less based on 100 parts by mass of the synthetic fibers. Further, the amount of water used for washing the synthetic fibers using the cleaning agent of the present invention is not particularly limited, but for 100 parts by mass of the synthetic fibers, the lower limit is preferably 100 parts by mass or more, and the upper limit is not limited. Preferably 500,000 parts by mass or less.

  The cleaning agent of the present invention is preferably used at a cleaning temperature higher than 40 ° C. from the viewpoint of imparting excellent water absorption to the synthetic fibers while effectively suppressing recontamination of the synthetic fibers due to cleaning. . For example, a cleaning agent for household fibers is generally assumed to be cleaned at around room temperature (25 ° C.), but the cleaning agent of the present invention is desirably used at a cleaning temperature higher than 40 ° C. The lower limit of the washing temperature of the detergent of the present invention is preferably 45 ° C. or higher, more preferably 50 ° C. or higher, even more preferably 55 ° C. or higher, and the upper limit is preferably 90 ° C. or lower, more preferably Is 85 ° C. or lower, more preferably 80 ° C. or lower.

  The cleaning agent of the present invention may be used in combination with a cleaning agent different from the cleaning agent of the present invention.

  The cleaning agent of the present invention is also referred to as a commercial detergent or a commercial detergent, and is not particularly limited, unlike home use, but is used in factories, shops, restaurants, offices, and the like, and is used at a high temperature during washing. . In addition, a device that can be cleaned at a high temperature is also used for the cleaning machine.

2. Synthetic fiber cleaning method The synthetic fiber cleaning method of the present invention comprises a cleaning step of mixing the cleaning agent of the present invention, a synthetic fiber, and water to wash at a temperature higher than 40 ° C; A rinsing step for rinsing the fibers with water (rinsing step).

  The details of the cleaning agent of the present invention are as described in the section of “1. As described above, the synthetic fibers to be cleaned by the cleaning method of the present invention are preferably synthetic fibers containing at least one of a polyester fiber and an acrylic fiber. Further, the natural fibers may be washed together with the synthetic fibers, or may be used for washing the natural fibers. Further, it is desirable to perform the cleaning at a high temperature.

  In addition, when the cleaning agent of the present invention is used, the usage amount of the cleaning agent, the usage amount of water, and the cleaning temperature are also as described above. That is, the amount of the cleaning agent of the present invention used in the cleaning step is not particularly limited, but the lower limit is preferably 0.1 parts by mass or more, and the upper limit is preferably 30 parts by mass with respect to 100 parts by mass of the synthetic fibers. The following are mentioned. The amount of water used is not particularly limited, but the lower limit is preferably 100 parts by mass or more, and the upper limit is preferably 500,000 parts by mass or less based on 100 parts by mass of the synthetic fibers. The lower limit of the washing temperature in the washing step is preferably 45 ° C. or higher, more preferably 50 ° C. or higher, and still more preferably 55 ° C. or higher, and the upper limit is preferably 90 ° C. or lower, more preferably 85 ° C. or lower. ° C or lower, more preferably 80 ° C or lower.

  The washing time in the washing step is not particularly limited, but the lower limit is preferably 3 minutes or more, and the upper limit is preferably 30 minutes or less.

  In the cleaning method of the present invention, after the cleaning step, a step of rinsing the synthetic fibers with rinsing water is performed. The method for rinsing the synthetic fibers with rinsing water is not particularly limited, and can be performed in the same manner as the rinsing step in a known method for cleaning textile products. After the rinsing step, a synthetic fiber drying step can be performed as in the case of general fiber product washing.

  The method for washing synthetic fibers of the present invention (washing step, rinsing step, and drying step) can be performed using a known washing device.

  Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples. The details of the devices, materials, execution procedures, and the like in the examples and comparative examples are as follows.

<Materials and equipment>
・ Small washing machine (2kg)
・ Spectrophotometer CM-600d (Konica Minolta)
・ Test cloth: Polyester cloth: Polyester jersey (Tanito Shoten)
・ Base cloth and adjustment cloth: 4 cotton towels used for one test (150 g with 4 cotton towels)
Pretreatment detergent: using common liquid detergent Hardness modifier: 35% CaCl ₂
-Soil: Use rapeseed oil (100 g) colored with oil red O (0.1 g).-Detergent for confirming water absorption: 0.005% polyoxyethylene alkylene alkyl ether aqueous solution colored with red No. 2. Cleaning agent: Particles having compositions shown in Examples 1 to 7 and Comparative Examples 1 to 5 in Table 1 below were used. The “degree of methoxyl group substitution” of hydroxypropyl methylcellulose is the average number of hydroxyl groups substituted with methoxyl groups per glucose ring unit of cellulose.

[Component (a)]
(A-1) Metrolose SM100 (Methylcellulose having a weight average molecular weight of about 90,000, a methoxyl group substitution degree of 1.8, and a methoxyl group mass% of 27.5 to 31.5, manufactured by Shin-Etsu Chemical Co., Ltd.)
(A-2) Metrolose 60SH3 (manufactured by Shin-Etsu Chemical Co., Ltd.) with a weight average molecular weight of about 20,000, a methoxyl group substitution degree of 1.9, a methoxyl group mass% of 28 to 30%, and a hydroxypropoxyl group mass% of 7 to 7 12 hydroxypropyl methylcellulose)
(A-3) Metrolose 60SH15 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 50,000, a methoxyl group substitution degree of 1.9, a methoxyl group mass% of 28 to 30%, and a hydroxypropoxyl group mass% of 7 to 12 hydroxypropyl methylcellulose)
(A-4) Metrolose 60SH50 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 80,000, a methoxyl group substitution degree of 1.9, a methoxyl group mass% of 28 to 30%, and a hydroxypropoxyl group mass% of 7 to 30 12 hydroxypropyl methylcellulose)
(A-5) Metroze 65SH50 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 80,000, a degree of methoxyl group substitution of 1.8, a methoxyl group mass% of 27 to 30%, and a hydroxypropoxyl group mass% of 4 to 4 7.5 hydroxypropyl methylcellulose)
(A-6) Metrolose 65 SH400 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 140,000, a methoxyl group substitution degree of 1.8, a methoxyl group mass% of 27 to 30%, and a hydroxypropoxyl group mass% of 4 to 4 7.5 hydroxypropyl methylcellulose)
(A-7) Metrolose 60SH4000 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 290,000, a methoxyl group substitution degree of 1.9, a methoxyl group mass% of 28 to 30%, and a hydroxypropoxyl group mass% of 7 to 7 12 hydroxypropyl methylcellulose)
(A-8) Troze 65SH4000 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 290,000, a methoxyl group substitution degree of 1.8, a methoxyl group mass% of 27 to 30%, and a hydroxypropoxyl group mass% of 4 to 4 7.5 hydroxypropyl methylcellulose)
(A-9) Troze 90SH4000 (manufactured by Shin-Etsu Chemical Co., Ltd.) having a weight average molecular weight of about 290,000, a degree of methoxyl group substitution of 1.4, a methoxyl group mass% of 19 to 24%, and a hydroxypropoxyl group mass% of 4 to 4 12 hydroxypropyl methylcellulose)
[Other ingredients]
Nonionic surfactant: polyoxyethylene alkylene alkyl ether anionic surfactant: alkane sulfonate, fatty acid salt chelating agent: methyl glycine diacetate alkaline agent: sodium carbonate

<Implementation procedure>
(Pretreatment step)
In a small washing machine, a polyester jersey as a test cloth was washed with 0.2% ows. Washed at 50-70 ° C. for 15-30 minutes, rinsed thoroughly, dried and used for testing. The cotton towel as the base cloth and the adjustment cloth is 0.2% ows. , And washed again without adding detergent.

(Preparation for cleaning)
After the pretreatment step, one pretreated test cloth was stuck to one pretreated base cloth with tweezers. In addition, three prepared cloths were prepared for each test.

(Washing process)
The procedure of the washing step is as follows. Detergent 0.1% ows. Washing hardness with CaCl ₂ : 8 g of a washing solution adjusted to 6 degrees German hardness (adjusted to the washing temperature shown in Table 1), stain: rapeseed oil (100 g) colored with oil red O (0.1 g) did. Next, the test cloth stuck on the base cloth and three prepared cloths were put in a washing liquid, and washed with a small washing machine for 5 minutes. After washing, draining was performed, and the operation of rinsing the test cloth stuck to the base cloth for 3 minutes with rinsing water having a hardness of 2.5 degrees German hardness and a water temperature of 25 ° C. was performed twice. Thereafter, the test cloth was removed from the base cloth and dried.

(Measurement / Evaluation stage)
[Evaluation of suppression of recontamination]
The reflectance of the test cloth before and after washing was measured with a spectrophotometer (CM-600d Konica Minolta), and the recontamination rate (%) was obtained by the following equation using the Y value.
Recontamination rate (%) = (Reflectance of test cloth after pretreatment−Reflectance of test cloth after washing) / Reflectance of test cloth after pretreatment × 100
Based on the re-contamination rate, the re-contamination prevention property was evaluated as follows. Table 2 shows the results.
：: Recontamination rate of less than 10% 〇: 10% or more and less than 15% △: Recontamination rate of 15% or more and less than 20% ×: Recontamination rate of 20% or more

[Water absorption]
The end of the washed polyester cloth was immersed in water in a surfactant aqueous solution (0.005% polyoxyethylene alkylene alkyl ether aqueous solution), and the time required for the aqueous solution to absorb water to a height of 3 cm from the water surface was measured. The time was evaluated as water absorption as follows. Table 2 shows the results.
◎: less than 50 seconds〇: 50 seconds to less than 70 seconds７０: 70 seconds to less than 110 seconds ×: 110 seconds to less than 140 seconds XX: 140 seconds or more

[Washability]
Affixing CFT P-02 (manufactured by Nippon Sanso Co., Ltd.), which is a polyester fiber contaminated cloth, to the base cloth, and using the cleaning agents of Examples and Comparative Examples, in the same manner as in the cleaning step procedure of the above (cleaning step). A cleaning test was performed to determine a cleaning rate. The cleaning rate was determined by measuring the reflectance of the unstained cloth and the reflectance before and after the cleaning with a spectrophotometer (CM-600d Konica Minolta) and using the Y value by the following equation. As a result, the same good detergency was confirmed using any of the cleaning agents.
Cleaning rate (%) = {(reflectance after cleaning−reflectance before cleaning) / (reflectance of uncontaminated cloth−reflectance before cleaning)} × 100

Claims (6)

A synthetic fiber detergent including polyester fiber ,
The detergent includes a surfactant and hydroxypropyl methylcellulose,
The hydroxypropyl methylcellulose has a weight average molecular weight of 30,000 to 90,000, a hydroxypropoxyl group ratio of 4 to 13% by mass, a methoxyl group ratio of 27 to 30% by mass, and a methoxyl group substitution degree. A synthetic fiber detergent having a thickness of 1.8 to 2.0 (except for a film having a thickness of 30 to 30,000 μm). The synthetic fiber detergent according to claim 1 , wherein the content of the hydroxypropylmethylcellulose is 0.01% by mass or more and 15% by mass or less. The synthetic fiber detergent according to claim 1 or 2 , wherein the surfactant includes an anionic surfactant and a nonionic surfactant. The synthetic fiber cleaning agent according to any one of claims 1 to 3 , which is used at a cleaning temperature higher than 40 ° C. An industrial detergent for synthetic fibers according to any one of claims 1 to 4 . A cleaning step of mixing the cleaning agent according to any one of claims 1 to 5 , the synthetic fiber, and water to wash at a temperature higher than 40 ° C,
After the washing step, a step of rinsing the synthetic fibers with rinsing water,
A method for cleaning synthetic fibers including polyester fibers, comprising :