JPS5874800A - Liquid alkali detergent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a practical alkaline cleaning agent, particularly a liquid cleaning agent with excellent stability and cleaning properties.

Today, large amounts of alkaline cleaning agents are consumed in preparatory work such as coating metals, plastics, etc., and painting. These alkaline cleaning agents are generally blended with alkali metal hydroxides, neutral salts of alkali metals, chelating agents, various builders, surfactants, etc., and are used today. The majority of detergents are in the form of granules or powders, which are prepared by coating or impregnating a hylic acid component with a surfactant and then drying it.

However, in addition to being bulky, solid products such as granules and powders have many operational and occupational health problems, such as the difficulty of measuring them during use and the scattering of fine powder when taking them out of containers. On the other hand, while liquids have advantages over the former, such as being easy to measure and can be transported through pipes, they also have the disadvantage that the surfactant may separate and precipitate due to the salting-out effect. . The present invention relates to a new detergent composition that solves the above problems in liquid alkaline detergents.

Conventionally, in an attempt to stably incorporate a surfactant into an alkaline aqueous solution, the hydrotropic effect (H
ydqrotropic action, solubility increasing action).

(2) A method of lowering the HLB value of a surfactant.

and (3) a method of dividing the alkaline cleaning agent into two parts (one liquid and the other liquid or powder).

etc. are known.

However, in the method (1) that utilizes hydrotropy, problems arise such as a decrease in performance and, especially when an anionic surfactant is added, a resulting increase in foaming properties. Further, according to the method (2) of lowering the HLB, cleaning performance is sacrificed. Furthermore, the division method (3) has a major disadvantage in terms of workability. As described above, all of the known means for preventing precipitation of surfactants are unsatisfactory in their effectiveness, which has hindered the development of liquid detergents.

However, as a result of conducting systematic research on means for preventing the precipitation phenomenon in liquid alkaline cleaning agents, the present inventor found that
It has now been discovered that a number of water-soluble polymeric substances are extremely useful for this purpose.

Incidentally, water-soluble polymeric substances are generally hydrophilic colloidal substances, and it is well known that the presence of these colloidal substances is effective in preventing precipitation of poorly soluble substances. The fact that a strong precipitation prevention effect can be achieved in an atmosphere and in the presence of a large amount of electrolyte cannot be easily predicted, and is a new finding discovered for the first time by the present inventor. In any case, the hydrophilic polymer substances referred to in the present invention include, for example, the following substances.

(1) Starches: potato starch, sweet potato starch, tapioca starch, wheat starch, corn starch, etc.

(Jil Mannans: Konjac mannan, etc.

(-) Seaweed mucilage Nifunori, agar, farcelan,
Carrageenan et al.

(1■) Plant mucilages: trumpet mucus, yam mucilage, tragacanth gum, arabic gum, galaya gum, almond gum, arabinogalactan←strawberry→, galati gum, locust bean gum, tamarind gum, tara gum, quince gum, pectin, dextrin, etc.

(v) Microbial mucilages: xanthan gum, curdlan, succinoglucan, pullulan, dextran, levan, etc.

(VD Protein: glue, gelatin, casein, plasma protein, whey protein, soy protein, wheat protein, collagen.

(dD Cellulose and semi-synthetic cellulose conductors: microcrystalline cellulose, viscose, methylcellulose (MC
), ethylcellulose (EC), hydroxyethylcellulose (HEC), carboxymethylcellulose (CM
C).

Hata: Semi-synthetic seaweed mucilage sodium nialginate, alginate propylene gellicol ester, etc.

(Semi-synthetic protein: Sodium caseinate.

(×), Semi-synthetic starch derivatives: soluble Denzo/, carboxymethyl starch (CMS), IJ acid starch, N, dialdehyde starch, nclodextrin, etc.

(XI) Synthetic product: polyvinyl alcohol (PVA)
, sodium polyacrylate, polyethylene oxide, etc.

Among the above-mentioned polymer substances, those which are particularly suitable for the purpose have a strong emulsion stabilizing effect, a relatively low viscosity, and a strong salt resistance.
It also has a weak gelling effect. Examples of substances that meet this condition include guar gum, tamarind gum, carrageenan, furcelan, sodium alginate, gum tragacanth, gum arabic, arabinogalactan, LM
Examples include pectin, xanthan gum, sodium caseinate, and carboxymethyl cellulose.

The polymeric substance is present in the composition with 0. It is added in an amount of 5.0% to 5.0%, preferably 0.3 to 2.0%. If it is less than 0.1%, sufficient stability cannot be obtained, and if it exceeds 5%, the viscosity of the composition becomes too high and it becomes difficult to flow. However, this upper limit is just a guideline; for example, in the case of a polymeric substance with low viscosity such as gum arabic, it has sufficient fluidity even at a higher concentration.

The cleaning agent of the present invention is composed of an alkaline substance and a water-soluble polymer substance as essential components, as well as general components such as a nonionic surfactant, a chelate compound, and a builder, and water as a medium. For example, strong alkaline substances such as caustic alkali, alkali carbonate, and sodium silicate are used as alkaline substances, and examples of nonionic surfactants include polyoxyethylene alkylphenol, polyoxyethylene fatty alcohol, polyoxyethylene fatty acid, Polyoxyethylene acid amide, polypropylene glycol, block polymers of polypropylene glycol, and the like are preferably used. The nonionic surfactant is preferably one with a high HLB (the higher the HLB is, the better. As the chelate compound, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, or salts thereof are used. Furthermore, as the builder in the present invention, , preferably inorganic alkaline and neutral salts and organic alkaline salts and neutral substances, such as, for example, sodium phosphate, sodium hydrogen phosphate,
Examples include sodium polyphosphate, sodium carbonate, sodium sesquicarbonate, water glass, sodium sulfate, sodium chloride, sodium citrate, fatty acid amide, and sodium naphthalene sulfonate.

Examples of the present invention will be shown below, but these are merely illustrative and do not limit the technical scope of the invention.

Example 1 A standard liquid alkaline detergent composition was prepared according to the formulation in Table 1 below.

Various water-soluble polymer compounds were blended into the above basic composition (Formulation A) as shown in Table 2 below.

(The amount added is the same for both formulations A and B.) Table 2 * Sodium salt of polyoxyethylene alkyl phenyl ether sulfate Each test material that passed the stability test was left at room temperature (25°C) for 7 days and the can liquid was The stability of was observed. The results were as shown in Table 3 below.

Table-3 〔Evaluation criteria〕 0: No separation, precipitation or precipitate observed.

△Nigelization occurs X: Separation, precipitation, or precipitate was observed.

As shown in Table 3 above, products 1 to 5 of the present invention containing bovine suntan gum or it and sodium alginate or sodium CMC, sodium CMC, or sodium CMC and an anionic surfactant have a polymer compound content of 0.
．． It is shown that the composition is stabilized within the range of 5-1.2%. On the other hand, when the comparative amounts 1 and 2 containing xanthan gum or polyvinyl alcohol at 0.05% or +IO, os%, the stabilizing effect was insufficient, and C
Comparative amounts 3 and 4 containing MC-Na or 6% soluble starch caused gelation, indicating the fact that they were unsuitable for commercial use. Incidentally, the xanthan gum used in this experiment is D-glucose, D-mannose, and D-glucuronic acid linked together in a chain, and CMC is D-glucuronate.
-Since only glucose is the backbone of a compound that is linked in a linear chain, and alginic acid is a linear combination of D-mannouronic acid, they cannot be said to be chemically different. Therefore, it is presumed that the chemical structure of the water-soluble polymer substance does not have much influence on the effectiveness of the invention. In addition, from the results of this experiment, the content of water-soluble polymeric substance in the composition is 0.
, 1% to 5%, preferably 0.3 to 2.0%.

Example 2 Standard liquid alkaline cleaning composition used in the previous example (formulation A)
The following actions were taken.

(A) Comparative amount A: 0.5% of sodium salt of polyoxyethylene alkylphenyl ether phosphate was added as a hydrotropic agent.

(b) Comparative amount b: Added 1% Impropatool as a hydrotropic agent.

(c) Comparative amount c: HLB of nonionic surfactant is IO
change to.

) Comparative product 22 builder part and chelate part (granular solid matter) point surface active part separated into 5 parts (liquid) O Separately, in the stabilizer of invention product 5, the anionic surfactant was 4% casein. Invention 5' was created by changing the .

Comparative products A to II and products I and V of the present invention were compared in terms of stability, washability, foaming performance, and workability. The results are shown in Table 4 below.

Note 1) Stability evaluation O: Stable for more than 1 week △: 1 week undetermined stable Separated in less than 1 week Note 2) Cleanability evaluation (al) Item to be cleaned A commercially available test piece was coated with 80 parts of Mopil Oil #-50 and 0 paper soaked in a mineral oil/fat mixture consisting of 20 parts of soybean oil was layered alternately and heated to 100 cj at 100°C.
After leaving under the pressure of A for 3 hours, remove the 0 paper and use it for the test.

(bl Cleaning conditions Adopts electrolytic cleaning method with polar cathode treatment, current density 4
fiy'M, electrolysis time 3 seconds, cleaning agent concentration 3oy
ie (as solid content), washing temperature 70°C.

(cl evaluation method Measure and calculate the water wet surface M (%) of the iron plate to be cleaned.

Note 3) Pour 50 μl of each foaming cleaning solution into a 1004 volume Nessler tube, and add 20
Shake vigorously at a rate of 0 and the amount of bubbles generated is expressed as d number.

Note 4) Evaluation of workability O: Good workability ×: Poor workability As shown in the above experimental results, the comparative amount A, in which an anionic surfactant was added as a hydrotropic agent, had poor stability and foaming properties. is large, and the cleaning properties are not very good. It can be seen that the comparative product containing Impropatool as a hydrotropic agent has extremely poor stability and has virtually no hydrotropic effect on a highly concentrated liquid detergent such as the present composition. The detergency of the comparative amount of nonionic surfactant with lower HLB was significantly poorer, which supports the correlation between HLB and detergency, as is commonly believed. Moreover, the stability has not improved that much. It goes without saying that Comparative Product 2, in which part of the bilge and the surfactant are separated, has good stability, but it goes without saying that the workability is inferior.

Contrary to the above, both invented products 1 and 5', which contain polymer compounds, are stable, have the same or better cleaning properties than comparative product 2, and have not so large foaming properties, and are easy to work with. It is excellent as a liquid alkaline cleaning agent. The superior detergency of Inventive Product 1 compared to Inventive Product 5' probably correlates with the property of xanthan gum to form large emulsified particles.

As described in detail above, the present invention completely solves the stability disadvantages of industrial liquid detergents, and maximizes the advantages of liquid detergents, so it is useful for detergent users. It brings great benefits to the world.

Claims (1)

[Claims] ill A liquid alkaline detergent containing a water-soluble polymeric substance as an essential stabilizer component. (2) The composition contains 0.1 to 5 water-soluble polymeric substances.
．． A liquid alkaline cleaning agent present in an amount of 0%, preferably in the range of 0.3-2.0%.