KR0146507B1 - Rinse aid composition for automatic dishwasher - Google Patents

Abstract

In the present invention, a low-saturation nonionic surfactant is used as a main component, and an auxiliary surfactant, an organic acid, and a phase stabilizer are blended therein to reduce stains and condensation on the tableware, and in particular, excellent in phase stability, and The present invention relates to a rinsing agent composition for automatic dishwasher having a very good removal ability of calcite.

Description

Rinsing agent composition for automatic dishwasher

The present invention relates to a rinsing agent composition for an automatic dishwasher.

More specifically, the present invention has a low saturation nonionic surfactant as a main component, and by combining the auxiliary surfactant, organic acid and phase stabilizer to reduce the stain stains and water droplets on the tableware, in particular excellent phase stability In addition, the present invention relates to a rinsing agent composition for an automatic washer excellent in removing calcifications generated in a dishwasher.

Household automatic dishwashers are slightly different for each manufacturer, but are generally configured to perform the washing and rinsing of the dishes. In the multi-stage washing process, clean water is supplied to each process, and food residues on the tableware are dispersed by clean water in the pre-wash cycle and then washed with detergent in the washing process. . In addition, after the washing process, there are one or two rinsing processes, and the washing is completed by completely drying by performing a drying process of heating and sterilizing the cleanly washed dishes to a high temperature.

Dishwasher detergents can usually be classified in liquid and powder forms and are mostly alkaline. Therefore, when the rinsing agent is not added separately in the rinsing process after the washing process, the traces are not completely removed by the alkaline detergent alone and stains remain after drying. In particular, when the tableware is heavily contaminated by oil or uses a detergent with strong alkalinity, the material or contaminant marks remain on the table unless a rinse agent is used.

Therefore, to solve this problem and use a rinsing agent for a more perfect dish washing, this rinsing agent is mainly composed of an acidic liquid to neutralize the alkalinity of the detergent to remove the stain phenomenon of the tableware have. However, rinsing agents up to now usually use a non-ionic surfactant as a main component, it is difficult to control excessive bubbles, and the phenomenon that some residual bubbles remain even after the rinsing process is completed.

That is, U.S. Patent Nos. 5,294,365 and 5,273,677 disclose rinsing agent compositions for dishwashers containing conventional hydroxy polyether-based surfactants, and U.S. Patent No. 4,416,794 for low foaming dishwashers containing aminosilanes. For rinsing agent compositions, US Pat. No. 4,415,502 discloses rinsing agent compositions containing polycarbonate-type nonionic surfactants, all of which suffer from the problems described above.

Moreover, as a nonionic surfactant which has a linear alkali group normally used for the rinse agent for dishwashers, the alkyl polyoxy ethylene propylene copolymer which superposed | polymerized ethylene oxide (EO) and propylene oxide (PO) especially among low foaming nonionic surfactants. When the polymerization degree of EO in the molecular structure is increased, the foaming force is increased, and when the dishwasher is operated, the water spraying power of the dishwasher is lowered, which lowers the washing power and causes bubbles to overflow to the outside. On the other hand, when the degree of polymerization of PO is large, the solubility in water is poor, stains remain on the tableware, and the degree of stability of the image is lowered, and a rinsing agent is separated. In addition, even if the ratio of EO / PO is appropriate for the foaming power and the cleaning power, phase separation occurs when the summer and room temperature rise to a high temperature.

Therefore, the present inventors have conducted extensive research over a long period of time to solve the problems of the existing composition as described above in the rinsing agent composition for automatic dishwasher, as a result of the alkyl polyoxy ethylene propylene air which is a low-saturation nonionic surfactant Instead of using the copolymer alone, it was found that by combining with an alkyl ethoxylate, an auxiliary surfactant, and adding an organic acid and a phase stabilizer to it, a significant improvement can be achieved without any problem in removing and rinsing the traces in the dishes. The present invention has been completed.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a rinsing agent composition for an automatic dishwasher, characterized by containing a low foaming nonionic surfactant, an auxiliary surfactant, an organic acid and a phase stabilizer.

In the present invention, an alkyl polyoxy ethylene propylene copolymer copolymerized with EO and PO is used as a low foaming nonionic surfactant to prevent staining of dishes after cleaning and a clean rinsing effect, and EO is added alone as an auxiliary surfactant. Alkyl ethoxylates were used.

When the main component of the alkyl polyoxy ethylene propylene copolymer is less than 5% by weight, the effect of rinsing agent is insignificant, and when it exceeds 30% by weight, air bubbles are generated in the tableware due to excessive bubbles, so it is in the range of 5 to 30% by weight. It is preferable to use. In addition, it is preferable to use an EO: PO ratio of 1: 1 to 3: 1 and an EO degree of polymerization of 3 to 15. When the EO content is less than the PO content and the degree of polymerization of EO is 3 or less, the foaming force is small. This is because the solubility in water and phase stability are lowered, and if the EO content is three times or more than the PO content or the EO polymerization degree is 15 or more, side effects may occur due to excessive bubbles.

As for the alkyl ethoxylate used as an auxiliary surfactant, it is preferable to use 0.05-3 weight% of thing whose EO polymerization degree is 5-15. When 0.05 wt% or less or EO polymerization degree is 5 or less, the secondary role of stain removal is insignificant, and the contribution to phase stability is lowered. When 3 wt% or more or EO polymerization degree is 15 or more, the effect of reducing table stain is caused by excessive bubbles. Is lowered.

In the present invention, at least one substance selected from citric acid, cilic acid, malic acid, and succinic acid, which are organic acids that are also used as food additives, is used to remove calcite deposits generated between detergent and hard water. Preferably from 3 to 30% by weight. Because less than 3% by weight, the effect on calcification deterioration is lowered and phase stability is lowered, and when it exceeds 30% by weight, corrosion in the dishware and the washing machine occurs as the acidity increases.

In addition, it is preferable to use 3 to 30% by weight of at least one material selected from propylene glycol (PG), ethylene glycol (EG) and ethanol (Ethanol) as a phase stabilizer for improving the stability to the phase. If the content is less than 3% by weight, the degree of stability decreases, so that the rinsing agent is separated even at room temperature. If the content is more than 30% by weight, the solvent smell becomes stronger when the product is used, which may cause inconvenience to the user and cause cost increase. .

The rinsing agent composition according to the present invention having the configuration as described above not only exhibits an excellent removal effect against stains due to contamination and detergents in dishes, but also has a low foaming force and is excellent in stability for the present inventors. It has been shown to be an excellent rinsing agent composition as intended.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, these examples are only for the understanding of the present invention, and the scope of the present invention in any sense is not limited to these examples.

[Comparative Examples 1 to 5 and Examples 1 to 7]

A rinsing agent composition (Comparative Examples 1 to 5 and Examples 1 to 7) having the components as shown in Table 1 below was prepared according to a conventional method for preparing a rinsing agent composition, and the rinsability, phase of each of the prepared compositions Performance such as stability, foamability, dryness and descaling power were tested as described below and the results are shown in Table 1.

Performance test:

(1) Dishwasher: Venus Dishwasher GDW-052M

(2) Detergent: 5 g of a commercially available alkaline detergent for dishwasher was used.

Detergent main ingredient-soda ash, sodium silicate, phosphate, chlorine bleach

(3) specimen manufacture

① mashed rice with a spoon in a fraudulent rice bowl and dried for 5 hours.

② The egg yolks, margarine and skim milk powder were mixed 1: 1 and evenly applied to a stainless steel soup bowl and dried for 24 hours.

③ Evenly coated butter in a large glass cup and dried for 24 hours.

④ Rice bowl, soup bowl and cup were used four times per test.

⑤ Main washing: Detergent was added to the detergent inlet and washed with the standard washing course. Among them, the material bureau and dishes with stains were selected and used for the rinsing experiment.

(4) rinsing test

After adding a rinsing agent, putting a tableware and performing a rinsing process, the stain state of the glass cup was visually observed, and it determined according to the following criteria.

◎: Very good ○: Excellent △: Poor X: Very poor

(5) Phase stability test

The rinsing agent was stored in a 50 ° C. thermostat for one week, and then the separation of contents was observed and evaluated according to the following criteria.

◎: Very stable ○: Stable △: Unstable X: Separation

(6) foam test

Rinse agent was added through the rinse agent inlet and rinsing was started with the rinse course. After the rinsing process was completed, the bubble state was measured according to the following criteria.

◎: No occurrence ○: Almost none △: Slight occurrence ×: Many occurrence

(7) drying test

After completion of the rinsing process, the time until complete drying was measured and evaluated as follows.

◎: Very good ○: Excellent △: Poor X: Very poor

(8) descaling ability

CaCO ₃ was dispersed in water and adhered to the inside of the glass, and the descaling force in the case of using a rinsing agent was measured according to the following criteria.

◎: Very good ○: Excellent △: Poor X: Very poor

As can be seen from the results of the above table, the ratio of EO: PO is outside the range of 1: 1 to 3: 1, or the alkyl polyoxy ethylene propylene copolymer having an EO polymerization degree outside the range of 3 to 15% by weight is used. In the case of lowering the stability of the phase or excessive foaming or unstable solubility, and even when using a copolymer falling within this range is less than 5% by weight or more than 30% by weight of rinsing resistance And a large amount of bubbles were generated, and thus bubbles stains were generated on the tableware.

On the other hand, when the use of the auxiliary surfactant alkyl ethoxylate less than 0.05% by weight or EO degree of polymerization of less than 5 was not able to fully perform the secondary role for rinsing properties and the phase was unstable, while the alkyl ethoxylate 3% by weight When used in excess or when the degree of polymerization of EO exceeds 15, the effect of reducing the staining of the dish due to the excessive amount of bubbles is reduced.

In addition, when citric acid is used at less than 3% by weight, the effect on calcification deterioration is lowered, and the stability to the phase is decreased. The phenomenon was shown.

Claims (7)

A rinsing agent composition for an automatic dishwasher, comprising 5 to 30% by weight of a low-saturation nonionic surfactant, 0.05 to 3% by weight of an auxiliary surfactant, 3 to 30% by weight of an organic acid and 3 to 30% by weight of a stabilizer. The composition of claim 1 wherein the low foaming nonionic surfactant is an alkyl polyoxy ethylene propylene copolymer. The composition of claim 2 wherein the EO: PO polymerization ratio of the alkyl polyoxy ethylene propylene copolymer is from 1: 1 to 3: 1 and the degree of EO polymerization is from 3 to 15. The composition of claim 1 wherein the cosurfactant is an alkyl ethoxylate. The composition of claim 4 wherein the degree of EO polymerization of the alkyl ethoxylate is from 5 to 15. 6. The composition of claim 1, wherein the organic acid is at least one selected from citric acid, malic acid, and succinic acid. The composition of claim 1 wherein the phase stabilizer is at least one selected from propylene glycol, ethylene glycol, and ethanol.