KR960004484B1 - Liquid detergent composition - Google Patents

Abstract

This is new liquid cleaner composition for automatic dish washing machine. The cleaner which comprises detergent, alkali supplement, antifoaming agent, low foamable nonionic surfactant, dispersing agent, chlorine compd and phase stabilizing agent, contains 1-10wt.% acrylate/maleic anhydride copolymer of formula(I). The molecular weight of the above copolymer is 5,000-30,000. Alkali supplement is such as soda ash, caustic soda, caustic potassium or sodium sulfate, and low foamable nonionic surfactant is alkylene oxide block polymer.

Description

Liquid detergent composition for automatic dishwasher

The present invention relates to a liquid detergent composition for an automatic dishwasher, characterized by containing 1 to 10% by weight of an acrylate / maleic anhydride copolymer having the general formula (I).

(Wherein m: n is 50-70: 50-30)

In general, automatic dishwasher liquid detergents used in homes include alkaline cleaning components such as phosphate, household soda, silicate, and soda ash, disinfecting and bleaching agents for chlorine compounds, foam control agents, phase stabilizing aids, and anti-agglomerating dispersants. .

Dishwasher detergents are divided into liquid and powder. Liquids have the advantages of easy handling, no agglomeration of caking, and high solubility, but the disadvantages are that the components are difficult to mix uniformly and the use of enzymes is greatly limited. have.

Household automatic dishwashers are machines in a tank, which consists of several stages of cleaning, with clean water supplied to each process. Food waste on the dishes is dispersed by clean water in the pre-wash cycle and washed with alkaline detergent in the post-wash process. After the washing process, one or two rinsing processes are performed. In Europe, there are rinsing agent addition processes, but in Korea and the United States, rinsing agent addition processes are omitted. Finally, the clean dishes have a drying process to dry them perfectly. If the rinsing process is omitted, there is a disadvantage that the traces are not completely removed by the alkaline cleaning components and thus stains remain after drying.

For example, US Pat. Nos. 3,494,868 and 4,237,024 describe general dishwashing detergent compositions. British Patent No. 0 304 328 A2 discloses a composition having excellent phase stability of high viscosity by containing anionic surfactant and soap in a general formulation of detergent for dishwasher. EP 0 346 111 A2 describes a liquid detergent composition for dishwashers in which the activity of sterile bleaching cleaning components such as sodium hypochlorite is very stable using nonionic surfactants. British Patent No. 1,164,350 discloses a liquid detergent composition for dishwashers in which an acrylic polymer and a phosphate are stabilized using clay, and the composition is reported to be particularly effective in washing ceramics.

Household dishwashers use anionic surfactants and nonionic surfactants in a single tank machine, which causes severe foaming and should limit their use to less than 5%.

Chlorinated trisodium phosphate, chlorinated isocyanurate, and sodium hypochlorite are used as chlorine compounds.The use of these chlorine compounds breaks down protein contaminants into water-soluble amino acids, making them easier to wash, reducing residual contaminants. Although it suppresses the occurrence of unclean stains, excessive use of a chlorine compound may worsen rapidly and the solubility of phosphate, the main cleaning component, may be reduced, and thus the cleaning power may be reduced.

In addition, when the chlorine compound is not used, the food residues on the tableware do not fall well, and stains may be generated after washing. In the case of using a nonionic surfactant to increase the stability of the chlorine compound, foaming is severe, and the washing is not performed, and the effect of using acrylic acid is very small.

Accordingly, the present inventors have made a research effort to solve the above-mentioned problems of the prior art, by containing the acrylate / maleic anhydride copolymer of the general formula (I) as an auxiliary cleaning component in a conventional liquid dish composition for automatic dishwasher, The present invention finds that the rinsability is improved by improving the instability of the phase generated when the conventional chlorine compound is contained, preventing the decrease of the phosphate content, increasing the chlorine stability, and increasing the cleaning power as well as minimizing the occurrence of the stain after washing. Came to complete.

In the acrylate / maleic anhydride copolymer of general formula (I) used in the present invention, maleic anhydride is contained in an amount of 30 to 50 parts by weight, and the copolymer has a molecular weight of 5,000 to 30,000 and a phase is more stable than an acrylic polymer. Excellent chlorine stability, very low after rinsing.

Detergent composition of the present invention using a diphosphate (TKPP, Na ₄ O ₇ P ₂ ) and triphosphate (STPP, Na ₃ O ₉ P ₃ ) 10 to 20 parts by weight as a cleaning component, soda ash (Na ₂ CO ₃ ) , 4 to 30 parts by weight of an alkali adjuvant such as home soda (NaOH), caustic (KOH), manganese (Na ₂ SO ₄ ), and 0.1 to 1 part by weight of a silicone antifoaming agent. In addition, 1 to 5 parts by weight of an alkylene oxide block copolymer (LF-403, manufactured by BASF), which is a low foaming nonionic surfactant, and 1 to 20 parts by weight of sodium silicate (47%) are used as a dispersing agent for preventing aggregation. 1 to 20 parts by weight of sodium hypochlorite (5%) is used as the chlorine compound, and 3 to 10 parts by weight of Laundrosil-DG (SUD-CHEMI), which is a bentonite compound, is used as the phase stabilizer. The detergent composition of the present invention uses 1 to 10 parts by weight, preferably 2 to 7 parts by weight of acrylate maleic anhydride copolymer.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited to these Examples. The test method used in the Example of this invention is as follows.

Detergency Test

1) Washing Machine: Venus Dishwasher GDW-090M

2) Specimen Manufacturing

① mash rice with spoon to dry rice bowl for 24 hours.

② Apply egg yolk and cooking oil evenly to stainless steel soup bowl and dry for 24 hours.

③ Put butter evenly in a large glass cup and dry for 24 hours.

④ Use 4 bowls of rice, soup bowl and cup.

3) cleaning power test

Put detergent (40g per dose) into the detergent inlet and wash with a standard cleaning course. At the end of the wash cycle, the dishes are removed and placed on a bright table and evaluated (at least 1,200 × LUX). The washing power of rice bowl and soup bowl is visually determined.

4) Rinsing Test

The stain state of the glass method is visually determined.

◎: very good ○: excellent : Bad ×: Very bad

5) Phase stability test

Two months after storage of detergent in a 25 ℃ thermostat, the contents are shaken vigorously to evaluate the degree of formation of aggregated kernels in the contents.

◎: very stable ○: stable : Unstable ×: Very unstable

6) Chlorine Stability Test

The contents are taken at intervals of 1 month in a 25 ° C thermostat for 6 months and the amount of effective chlorine is measured and evaluated. The amount of effective chlorine is quantified by the iodine method.

As shown in the comparative example of Table 1, in the case of the liquid detergent for dishwasher when sodium hypochlorite is used, the washing power tends to be increased and the rinsability is improved, but the phase stability is not good. When the acrylic acid polymer is used as in Comparative Example 3, the washing power is increased, the chlorine stability is improved, the rinsing property is improved, but the phase stability is not good. In Examples 1 to 4 it can be seen that when the acrylate / maleic anhydride copolymer is used, the chlorine stability is excellent, the cleaning power is excellent, the rinsing property is good, and the phase stability is also very excellent.

Claims (10)

In a liquid detergent composition containing a conventional cleaning ingredient, an alkali adjuvant, an antifoaming agent, a low foaming nonionic surfactant, a dispersing agent, a chlorine compound and a phase stabilizer, an acrylate / maleic anhydride copolymer having the following general formula (I): Liquid detergent composition for dishwasher, characterized in that containing 1 to 10% by weight per total weight of the composition. (Wherein m: n is 50-70: 50-30) The liquid detergent composition according to claim 1, wherein the acrylate / maleic anhydride copolymer contains 2 to 7 wt% based on the total weight of the composition. The liquid detergent composition of claim 1, wherein the acrylate / maleic anhydride copolymer has a molecular weight in the range of 5,000 to 30,000. The liquid detergent composition according to claim 1, wherein the cleaning component is diphosphate and triphosphate, and the content thereof is 10 to 20 wt% based on the total weight of the composition. The liquid detergent composition according to claim 1, wherein the alkali adjuvant is selected from soda ash, caustic soda, caustic and forget-me-not and its content is 4 to 30 wt% based on the total weight of the composition. The liquid detergent composition according to claim 1, wherein the antifoaming agent is a silicone compound and its content is 0.1 to 1% by weight based on the total weight of the composition. The liquid detergent composition according to claim 1, wherein the low foaming nonionic surfactant is an alkylene oxide block polymer and the content thereof is 1 to 5% by weight per the total weight of the composition. The liquid detergent composition according to claim 1, wherein the dispersant is sodium silicate and its content is 1 to 20% by weight based on the total weight of the composition. The liquid detergent composition according to claim 1, wherein the chlorine compound is sodium hypochlorite and the content thereof is 1 to 20% by weight based on the total weight of the composition. The liquid detergent composition according to claim 1, wherein the phase stabilizer is a bentonite compound and its content is 3 to 10% by weight based on the total weight of the composition.