JPH11229271A - Washing of hospital bedclothes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for washing hospital bedclothes, capable of removing chlorhexidine gluconate adhered to the hospital bedclothes to prevent the generation of stained marks due to a chlorine-based bleaching agent by preliminarily washing the hospital bedclothes with an aqueous solution containing a polybasic carboxylic acid or a hydroxycarboxylic acid and subsequently mainly washing the hospital bedclothes. SOLUTION: This method for washing hospital bedclothes comprises preliminarily washing the hospital bedclothes with an aqueous solution containing a polybasic carboxylic acid or a hydroxycarboxylic acid and subsequently mainly washing the hospital bedclothes with an aqueous solution containing a bleaching agent, an alkali builder and a detergent. The polybasic carboxylic acid includes oxalic acid, malonic acid and succinic acid, and the hydroxycarboxylic acid includes lactic acid, malic acid, tartaric acid and citric acid. The preliminary washing may be carried out with an aqueous solution containing both the polybasic carboxylic acid and the hydroxycarboxylic acid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for cleaning hospital bedding. More specifically, the present invention is capable of cleaning hospital bedding to which chlorhexidine gluconate used as a disinfectant has been attached without leaving traces of contaminants even when washed with cleaning water containing a chlorine bleach. The present invention relates to a method for cleaning hospital bedding that can be performed.

[0002]

2. Description of the Related Art Conventionally, in bed linen supplies, hospital bedding such as sheets, wrappers, pillowcases, sick coats, white coats, and surgical coats have been washed with an aqueous solution containing a bleaching agent, an alkali builder, and a detergent. In this case, bleaching agents used for removing stains include oxygen-based bleaching agents such as sodium percarbonate, hydrogen peroxide and sodium perborate, and chlorine-based bleaching agents such as sodium hypochlorite and sodium chlorite. And reducing bleaching agents such as hydrosulfite and sodium thiosulfate. An oxygen-based bleach is generally used for easily removing stains such as blood of healthy persons, pigments of beverages, and seasonings. However, in hospital bedding, chlorine bleach may be used because the blood of an inpatient may not be sufficiently removed with an oxygen bleach due to the effect of the therapeutic agent or the like. Chlorhexidine gluconate,
0.05 for general disinfection of the skin and storage of sterile instruments.
Although chlorhexidine gluconate is widely used in hospitals as a 0.5% solution, hospital bedding to which chlorhexidine gluconate has adhered is washed out with washing water containing a chlorine bleach to give gluconic acid that is colorless or slightly red. There is a problem that traces of chlorhexidine are discolored to dark black brown and cannot be dropped. Therefore, there is a need for a method of cleaning hospital bedding to which hospital bedding to which chlorhexidine gluconate has adhered can be cleaned without leaving traces of contamination even when the cleaning is performed using cleaning water containing a chlorine bleach. Had been.

[0003]

SUMMARY OF THE INVENTION The present invention removes chlorhexidine gluconate adhering to hospital bedding, and does not cause stains even if a chlorine bleach is used. It is an object of the present invention to provide a method for cleaning hospital bedding which can reduce the amount of work and contribute to workability and economy.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the cloth to which chlorhexidine gluconate has been adhered is treated with an aqueous solution containing a polycarboxylic acid or an oxycarboxylic acid. After pre-cleaning, it is found that by performing the main cleaning, it is possible to clean beautifully without leaving discolored contamination marks on the object to be washed,
Based on this finding, the present invention has been completed. That is, the present invention provides (1) preliminarily cleaning hospital bedding with an aqueous solution containing a polyvalent carboxylic acid or an oxycarboxylic acid,
A method for cleaning hospital bedding characterized by main cleaning with an aqueous solution containing a bleach, an alkali builder and a detergent, and
(2) The method for cleaning hospital bedding according to (1), wherein the polycarboxylic acid or oxycarboxylic acid is oxalic acid, malonic acid, succinic acid, lactic acid, malic acid, tartar soap or citric acid.
Is provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the method of cleaning hospital bedding of the present invention, preliminary cleaning is performed using an aqueous solution containing a polyvalent carboxylic acid or an oxycarboxylic acid. The polyvalent carboxylic acid used is not particularly limited as long as it has water solubility.For example, oxalic acid, malonic acid, succinic acid, saturated aliphatic dicarboxylic acid such as glutaric acid, unsaturated aliphatic such as maleic acid, etc. Examples thereof include aliphatic tricarboxylic acids such as dicarboxylic acid and 1,2,3-propanetricarboxylic acid. Among these, oxalic acid, malonic acid and succinic acid can be particularly preferably used. The oxycarboxylic acid used is not particularly limited as long as it has water solubility. For example, glycolic acid, lactic acid, 3-hydroxypropionic acid, 2-hydroxybutyric acid, 3-hydroxybutyric acid,
Examples include aliphatic oxycarboxylic acids such as glyceric acid, tartronic acid, malic acid, tartaric acid, and citric acid. Among them, lactic acid, malic acid, tartaric acid and citric acid can be particularly preferably used. In the method of the present invention, the polycarboxylic acid or oxycarboxylic acid is
The species can be used alone, or two or more can be used in combination.

In the method of the present invention, the conditions for pre-cleaning hospital bedding are not particularly limited, and can be appropriately selected according to the condition of dirt on the articles to be washed. The carboxylic acid is used in an amount of 0.2 to 1.0 parts by weight, that is, 0.2 to 1.0% ow, based on 100 parts by weight of the object to be washed.
f, it is preferable to wash at 2 to 10 minutes at a bath ratio of 1: 3 to 1:10 and a washing temperature of room temperature to 40 ° C. Preliminary cleaning of hospital bedding with an aqueous solution containing a polyvalent carboxylic acid or oxycarboxylic acid can prevent coloring and discoloration when a chlorine bleach is used in the main cleaning. The mechanism by which pre-washing with an aqueous solution containing a polyvalent carboxylic acid or oxycarboxylic acid can prevent coloring and discoloration in the main washing is not clear, but a substance that becomes colored and causes contamination marks, for example, gluconic acid Chlorhexidine

Embedded image Is presumed to be removed from the object to be washed as a salt having higher water solubility.

In the method of the present invention, subsequent to the preliminary cleaning, the main cleaning is performed using an aqueous solution containing a bleaching agent, an alkali builder and a detergent. There is no particular limitation on the bleaching agent used in the main washing, and for example, oxygen-based bleaching agents such as sodium percarbonate, hydrogen peroxide, sodium perborate, and sodium peroxide, sodium hypochlorite, sodium chlorite, and ground bean powder And a reducing bleach such as hydrosulfite, sodium thiosulfate and sodium bisulfite. If chlorhexidine gluconate is adhered to hospital bedding and main cleaning is performed using cleaning water containing a chlorine-based bleach, stains already stained on the item to be washed will occur immediately after main cleaning. By performing pre-cleaning in advance according to the method of the present invention, it is possible to remove colored substances and prevent the occurrence of contamination marks on the object to be cleaned. When the main washing was performed using an oxygen-based bleach or a reducing bleach, the color of the object to be washed immediately after the main washing was not remarkable, but the object to be washed was gradually colored by leaving the object to be washed. Contamination marks appear. According to the method of the present invention in which pre-washing is performed with an aqueous solution containing a polyvalent carboxylic acid or an oxycarboxylic acid, coloring that gradually appears after washing can also be prevented.

In the method of the present invention, the alkali builder used for the main washing is not particularly limited, and examples thereof include sodium metasilicate, sodium silicate, sodium carbonate, and sodium phosphate. Among them, sodium metasilicate can be preferably used. There is no particular limitation on the detergent used for the main washing, and for example, a synthetic surfactant such as α-olefin sulfonate, linear alkylbenzene sulfonate, polyoxyethylene alkyl sulfate, soap and the like can be used alone. Alternatively, commercially available detergents containing alkaline builders, defoamers, optical brighteners, enzymes and the like can be used. In the method of the present invention, the conditions for the main washing are not particularly limited, and can be appropriately selected depending on the condition of the stain on the article to be washed. Alkali builder
1.0% owf, 0.1 ~ 1.0% owf detergent, bath ratio 1: 3 ~ 1: 10, washing temperature 50 ~ 80 ° C, can be washed for 5 ~ 20 minutes. . By performing the main washing under such conditions, the stains on the articles to be washed such as hospital bedding can be removed without recontamination, and the bleaching effect can be further exhibited. The object to be washed after the main washing is preferably rinsed, dehydrated and dried by a known method.
According to the method of the present invention, hospital bedding to which chlorhexidine gluconate as a germicidal disinfectant has adhered also has good cleaning properties, bleaching properties and anti-recontamination properties, and does not cause coloring caused by chlorhexidine gluconate. Can be washed.

[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. Example 1 0.12 ml of a 5% by weight aqueous solution of chlorhexidine gluconate was applied in the form of a spot to the center of a 10 cm × 10 cm cotton cloth and dried at 80 ° C. for 30 minutes to prepare a test cloth.
When the color of the central spot to which chlorhexidine gluconate was attached was measured using a colorimeter [Minolta Camera Co., Ltd., Minolta CR-200], the L value was 91.5.
8, the a value was 0.69 and the b value was 0.58. Citric acid and water were added to a pot of Rounder O-Meter [Daei Kagaku Seiki Seisakusho Co., Ltd., L-20], and the citric acid concentration was 0.5% ow.
f, put so that the bath ratio becomes 1:10, further put 20 steel balls and 10 test cloths, and at 30 ° C 3
Pre-washed for minutes. In another rounder-o-meter pot, sodium hypochlorite (effective chlorine 12% by weight), sodium metasilicate 9-hydrate, phosphorus-free powder detergent [Nichika Chemical Co., Ltd., Siroc AN-55] and water The concentration of sodium hypochlorite (effective chlorine 12% by weight) is 1.0% owf, the concentration of sodium metasilicate 9-hydrate is 0.5% owf, and the concentration of phosphorus-free powder detergent is 0.5% owf. The test cloth 10 was placed so that the bath ratio was 1:10, and further 20 steel balls and the pre-cleaning were completed.
The sheets were placed without dehydration. After main washing at 60 ° C. for 10 minutes, rinsing was performed for 2 minutes, and drying was performed at 80 ° C. for 30 minutes. When the color of the spot portion at the center of the dried test cloth was measured, the L value was 91.59, the a value was -0.81, and the b value was 2.53. After washing, 0.08 ml of a 12% by weight aqueous solution of sodium hypochlorite was dropped into the center spot of the test cloth, and dried at 80 ° C. for 30 minutes. When the color of the center spot portion of the test cloth after drying was measured, the L value was 9
2.41, a value -1.38, and b value 1.79. Example 2 The same operation as in Example 1 was repeated, except that oxalic acid was used instead of citric acid in the preliminary cleaning. The center spot of the test cloth after the main cleaning has an L value of 91.8.
1, the a value was -0.88, and the b value was 2.26. Further, after the sodium hypochlorite aqueous solution was dropped and dried, the central spot portion had an L value of 92.58, an a value of -1.40, and a b value of 1.55. Comparative Example 1 The test cloth was directly subjected to main cleaning without performing preliminary cleaning, and the same operation as in Example 1 was repeated. The spot at the center of the test cloth after the main cleaning has an L value of 88.33 and an a value of-.
It was 0.11 and the b value was 9.78. Further, after the sodium hypochlorite aqueous solution was dropped and dried, the central spot portion had an L value of 90.16, an a value of -0.95, and a b value of 6.59. Comparative Example 2 The same operation as in Example 1 was repeated, except that acetic acid was used instead of citric acid in the preliminary washing. The spot at the center of the test cloth after the main cleaning had an L value of 89.00, an a value of -0.25, and a b value of 9.04. Further, after the sodium hypochlorite aqueous solution was dropped and dried, the central spot portion had an L value of 90.46, an a value of -1.03, and a b value of 6.10.
Met. Example 3 The same operation as in Example 1 was repeated, except that 35% by weight-hydrogen peroxide solution was used instead of sodium hypochlorite (effective chlorine 12% by weight) in the main cleaning. The spot at the center of the test cloth after the main cleaning has an L value of 92.70 and an a value of-
It was 0.85 and the b value was -0.32. Further, after the sodium hypochlorite aqueous solution was dropped and dried, the central spot portion had an L value of 92.29, an a value of -1.50, and a b value of 2.10.
Met. Example 4 The same operation as in Example 3 was repeated, except that oxalic acid was used instead of citric acid in the preliminary washing. The spot at the center of the test cloth after the main cleaning has an L value of 92.97,
The a value was -0.79 and the b value was -0.43. Further, after the sodium hypochlorite aqueous solution was dropped and dried, the central spot portion had an L value of 92.56, an a value of -1.42, and a b value of 1.73. Comparative Example 3 The test cloth was directly subjected to main cleaning without performing preliminary cleaning, and the same operation as in Example 3 was repeated. The spot at the center of the test cloth after the main cleaning has an L value of 92.11 and an a value of −
0.93 and b value 1.09. Further, after the sodium hypochlorite aqueous solution was dropped and dried, the central spot portion had an L value of 90.99, an a value of -1.16, and a b value of 5.31. The results of Examples 1 to 4 and Comparative Examples 1 to 3
It is shown in the table.

[0010]

[Table 1]

[0011] The state of contamination marks on the object to be washed appears most remarkably in the b value as an index of yellow to green, and also in the L value as an index of brightness. Looking at the results of Examples 1 and 2 and Comparative Examples 1 and 2 using sodium hypochlorite which is a chlorine-based bleaching agent, the examples in which the pre-cleaning was performed using citric acid or oxalic acid were performed after the main cleaning. In Comparative Example 1 where pre-cleaning was not performed, the b-value after the main cleaning was 9.78, and the pre-cleaning was performed using acetic acid, whereas the b value of the sample was as low as 2.53 and 2.26. In Comparative Example 2, the b-value after the main cleaning was 9.04, which was all high, and strong coloration of the central spot portion of the test cloth of Comparative Example was visually observed. Also, the L value is higher in the example than in the comparative example, and it can be seen that the test cloth of the example is cleaned to be brighter than the test cloth of the comparative example. By dropping sodium hypochlorite, the spot value was bleached in both the Examples and Comparative Examples to reduce the b value. However, the b values of the test cloths of Comparative Examples were still as large as 6.59 and 6.10, and It can be seen that contaminants that are not bleached even by the dropping of sodium chlorate remain. Further, the results of Examples 3 and 4 and Comparative Example 3 using hydrogen peroxide as an oxygen bleaching agent show that the b value after the main cleaning was -0.32 and -0.4.
3 and 1.09, which are low, and a remarkable difference is not visually observed, but when sodium hypochlorite is dropped, Examples
In both the comparative examples, the b value of the spot portion was large, and especially the b value of the test cloth of the comparative example was 5.31 and the yellowing was visually observed, indicating that the contaminants remained without being removed. I understand. Example 5 When washing hospital bedding using a 5-tub continuous washing machine with a load of 50 kg, the following test cloths (1) to (5) were simultaneously put into the washing machine to perform washing. , Bleaching property, re-staining prevention property and coloring property were evaluated. The test cloth used in this test was prepared as follows. (1) Standard contaminated cloth Cotton cloth or E / C cloth (polyester / cotton = 65/35)
To which 0.2% owf of tallow, 0.9% owf of liquid paraffin, and 0.03% owf of carbon are adhered. (2) Artificial contamination cloth Cotton cloth or E / C cloth (polyester / cotton = 65/35)
0.2% owf. Of tallow fatty acid, 0.2% owf. Of beef tallow, 0.07% owf. Of cholesterol, 0.15% ow of 51 ^° F wax
f, carbon 0.01% owf, Kanto loam layer 0.7% owf,
Cloth with 0.07% owf iron oxide. (3) Bleaching test cloth Cotton wine stained cloth [EMPA] and cotton blood stained cloth [E
MPA). (4) Redeposition prevention test cloth Cotton white cloth and E / C white cloth (polyester / cotton = 65/3)
5). (5) Color developing test cloth 5% by weight of chlorhexidine gluconate in the center of cotton cloth
0.12 ml of the aqueous solution is deposited in the form of a spot,
Cloth dried for 0 minutes. The evaluation was performed by the following method. In addition, the reflectance was measured at 550 nm using a colorimeter [Murakami Color Research Laboratory, CM-53D]. (1) Detergency The reflectance of cotton and E / C standard contaminated cloth and artificial contaminated cloth before and after cleaning and the reflectance of cotton and E / C white cloth are measured, and the cleaning rate is calculated by the following equation. Cleaning rate (%) = {(D′−D) / (WD)} × 100 where W is the reflectance of the white cloth, D is the reflectance of the contaminated cloth before cleaning, and D ′ is the contaminated cloth after cleaning. Is the reflectance. (2) Bleaching property The reflectance before and after washing the cotton wine-contaminated cloth and the cotton blood-contaminated cloth and the reflectance of the cotton white cloth are measured, and the bleaching rate is obtained by the following equation. Bleaching rate (%) = {(D′−D) / (WD)} × 100 where W is the reflectance of the white cloth, D is the reflectance of the contaminated cloth before cleaning, and D ′ is the contaminated cloth after cleaning. Is the reflectance. (3) Anti-re-contamination property The reflectance of the cotton and the E / C white cloth before and after washing is measured, and the anti-re-contamination rate is obtained by the following formula. Recontamination rate (%) = {(W−W ′) / W} × 100 where W is the reflectance of the white cloth before cleaning, and W ′ is the reflectance of the white cloth after cleaning. (4) Color-forming property The reflectance of the central spot of the color-forming test cloth after the main washing and the spot of the central part of the cloth after the main washing 0.08 ml of a 12% by weight aqueous solution of sodium hypochlorite were dropped. , 80 ° C
The reflectance was measured for the spot portion of the cloth dried for 30 minutes under the conditions described above, and the color development (%) was calculated as a percentage of the reflectance of the cotton white cloth.
And The color development at the center spot of the color development test cloth before washing was 86%. Oxalic acid and water are added to the first tub of a 5-tub continuous washing machine.
Hospital bedding and each test cloth, which were to be washed, were added so as to have a wf concentration, and preliminarily washed at 28 ° C. for 6 minutes.
In the second and third tanks, sodium hypochlorite (effective chlorine 12
Wt%), phosphorus-free powder alkaline builder [Nichika Chemical
Nikka Miracle Builder Co., Ltd.), phosphorus-free powder detergent [Nichika Chemical Co., Ltd., Siroc AN-55] and water at a concentration of 0.32% ow of sodium hypochlorite (effective chlorine 12% by weight).
f, the concentration of phosphorus-free powdered alkaline builder is 0.08% ow
f. Put the phosphorus-free powder detergent in a concentration of 0.16% owf, put in the pre-washed object to be washed, perform main washing twice at 60 ° C. for 6 minutes each, and further, in the fourth tank And rinsing twice in the fifth tank, and then using a sheet roll at 180 ° C. for 3 hours.
Dry for 0 seconds. The cleaning rate was 77% for the standard cotton cloth and E
/ C standard stain cloth 18%, cotton artificial stain cloth 22%, E /
C: 23% of artificially stained cloth. The bleaching rate was 66% for cotton wine stained cloth and 46% for cotton blood stained cloth. The recontamination rate was 0.0% for cotton white cloth and 0.1% for E / C white cloth.
The color development was 85% after the main washing and 84% after the sodium hypochlorite was dropped. Comparative Example 4 The second tank and the third tank were not cleaned in the first tank.
Only the main cleaning of the tank and the rinsing of the fourth and fifth tanks were performed under the same conditions as in Example 5, and the hospital bedding and the test cloths (1) to (5) were washed, and the washing property, bleaching property, The recontamination prevention method and color development were evaluated. The cleaning rate was 75% for the cotton standard stained cloth, 19% for the E / C standard stained cloth, 23% for the cotton artificially stained cloth, and 20% for the E / C artificially stained cloth. The bleaching rate is 6 for cotton-contaminated cloth.
8%, 45% cotton blood stained cloth. The recontamination rate was 0.1% for cotton white cloth and 0.2% for E / C white cloth. The coloring was 58% after the main washing and 60% after the sodium hypochlorite was dropped.
%Met. Comparative Example 5 Without preliminary cleaning in the first tank, sodium hypochlorite (effective chlorine 12% by weight) in the main cleaning in the second and third tanks.
Except that 35% by weight-hydrogen peroxide solution was used instead of
In the same manner as in Example 5, the hospital bedding and the test cloths (1) to (5) were washed, and the cleaning property, the bleaching property, the recontamination prevention method, and the coloring property were evaluated. The cleaning rate was 77% for the standard cotton cloth and E
/ C standard stained cloth 18%, artificial cotton stained cloth 21%, E /
C was artificially stained cloth 22%. The bleaching rate was 55% for cotton wine-contaminated cloth and 35% for cotton blood-contaminated cloth. The recontamination rate was 0.0% for cotton white cloth and 0.1% for E / C white cloth.
The color development was 86% after the main washing, and 63% after the sodium hypochlorite was dropped. Table 2 shows the results of Example 5 and Comparative Examples 4 and 5.

[0012]

[Table 2]

From the results shown in Table 2, it can be seen from Example 5 that the pre-cleaning was carried out using an aqueous solution containing oxalic acid and the main cleaning was carried out using cleaning water containing sodium hypochlorite. The coloring property after main washing and after dropping of sodium hypochlorite is almost the same as the coloring property before washing, and coloring due to chlorhexidine digluconate occurs. You can see that it is not. On the other hand, in Comparative Example 4 in which main cleaning was performed using cleaning water containing sodium hypochlorite without performing preliminary cleaning,
In the main washing, the color is changed by the bleaching agent, and the value of the coloring property is lowered. Even if sodium hypochlorite is dropped, the value of the coloring property is not recovered. In Comparative Example 5 in which the main cleaning was performed using the cleaning water containing hydrogen peroxide without performing the preliminary cleaning, the value of the coloring property after the main cleaning was the same as the value of the coloring property before the cleaning. Although no coloring was caused in the spot portion, it can be seen that chlorhexidine digluconate remains without being removed since coloring is performed by dropping sodium hypochlorite.

[0014]

According to the cleaning method of the present invention, even for hospital bedding to which chlorhexidine gluconate as a disinfectant / disinfectant has adhered, good cleaning properties, bleaching properties and anti-recontamination properties are ensured, and chlorhexidine gluconate is ensured. Can be prevented, and the number of rewashing can be reduced, which contributes to workability and economy.

Claims (2)

[Claims] 1. Preliminary cleaning of hospital bedding with an aqueous solution containing a polycarboxylic acid or an oxycarboxylic acid, followed by a bleaching agent,
A method for cleaning hospital bedding, comprising: main cleaning with an aqueous solution containing an alkali builder and a detergent. 2. The method according to claim 1, wherein the polycarboxylic acid or oxycarboxylic acid is
The method for cleaning hospital bedding according to claim 1, which is oxalic acid, malonic acid, succinic acid, lactic acid, malic acid, tartar soap or citric acid.