JPH01310730A - Dispersant and detergent containing it - Google Patents

Abstract

PURPOSE:To exhibit a superior dispersibility for solid particles hy using a dispersant composed of an alkaline earth metal salt of a low molecular weight polymer or copolymer of alpha,beta-unsaturated carboxylic acid which is prepared in the presence of an organic mercaptan as a telogen. CONSTITUTION:An organic polymer, which is used as a component of a dispersant for solid particles, is prepared by carrying out an addition polymerization of acrylic acid, etc., in the presence of an organic mercaptan such as hexylmercaptan, etc., as a telogen. An alkaline earth metal salt of a polymer of an alpha,beta-unsaturated carboxylic acid or a copolymer of an alpha,beta-unsaturated carboxylic acid and a vinyl monomer, which is capable of copolymerization, of 3000 or less in average molecular weight and 6-18 in carbon number is obtained by adding an alkaline earth metal such as calcium, etc., to the aforementioned polymer. A superior effect in dispersing and removing soil due to solid particles such as mud is exhibited by blending this dispersant into a detergent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dispersant having excellent dispersibility for solid particles and a cleaning composition containing the dispersant.

[Prior art and problems to be solved by the invention] Alkali metal salts of polymers or copolymers of acrylic acid, methacrylic acid, maleic acid, etc. with a molecular weight of 4,000 or more are generally used as dispersants for solid particles. It is used. However, the dispersing ability of these dispersants is still insufficient.

[Means to solve the problem]

As a result of intensive research on solid particle dispersants, the present inventors unexpectedly found that an alkaline earth metal salt of a polymer of low molecular weight α, β unsaturated carboxylic acid with organic mercapkun as a telogen has higher dispersibility. The present invention was completed based on the following findings.

That is, the present invention applies to carbon atoms having an average molecular weight of 3.000 or less and a carbon number of 6.
α
, a polymer of a β-unsaturated carboxylic acid, or an alkaline earth metal salt of a copolymer of a vinyl monomer copolymerizable with an α,β-unsaturated carboxylic acid.

In the present invention, a polymer or copolymer of α,β unsaturated carboxylic acid is produced using an organic mercaptan having 6 to 18 carbon atoms as a telogen. Examples of organic mercaptans used as telogens include hexyl, octyl,
Denru, dodecyl, tetradecyl, hexadecyl.

Examples include mercaptans such as octadecyl, 2-hydroxy-dodecyl mercaptan, and dodecylbenzenethiol.

The α,β unsaturated carboxylic acid used in the present invention has the following general formula <
I).

Z ] I C=C(I) ] I Y C0OH [In the formula, X, Y, and Z are respectively -ft and -CH3
,-Coo)I.

-DH or -CH2CO leaf is shown. ] As the salt of the α,β unsaturated carboxylic acid polymer represented by the general formula (I), for example, acrylic acid, methacrylic acid, 2
- Salts of hydroxyacrylic acid, fumaric acid, maleic acid, itaconic acid, aconitic acid, citraconic acid and the like.

Furthermore, vinyl monomers such as ethylene, styrene, butadiene, imbutylene, diisobutylene, methyl vinyl ether, vinyl acetate, vinyl pyrrolidone, acrylonitrile, acrylamide, etc. can also be used as comonomers.

In the present invention, examples of the alkaline earth metal constituting the salt of the polymer or copolymer include calcium, magnesium, barium, and the like. Among these, calcium salts are preferred. Of course, these salts may be partial salts.

The average molecular weight of the polymer or copolymer of the present invention is 3,000
Below, it is desirably in the range of 500 to 2,000.

The dispersant of the present invention is effective in dispersing and removing solid particle dirt such as mud when mixed with a cleaning agent, for example.

The dispersant is usually contained in the detergent composition in an amount of 0.1 to 15% by weight (
(hereinafter abbreviated as %). Other conventional ingredients are optionally included in the cleaning composition. For example, surfactants such as alkylbenzene sulfonates, alkyl ether sulfonates, olefin sulfonates, alkyl sulfates, alkanesulfonates, higher fatty acid salts, polyoxyethylene alkyl ether ethylene alkylphenyl ether, etc. 50%, bilges such as phosphates and citrates 0-10%, alkaline agents such as alkanolamines 0-10%, solubilizers such as ethanol, lower alkylbenzene sulfonates, glycols, urea, etc. 1-10% %, enzymes, fluorescent dyes, fragrances, etc.

〔Example〕

The present invention will be explained in more detail below with reference to Examples, but the present invention is not limited to these Examples.

Production Example Using dodecyl mercaptan as the telogen, an organic polymer in which 10 moles of acrylic acid was added to the dodecyl mercaptan was synthesized according to the method described in Yukagaku Vol. 28, pages 605-610. The average molecular weight was 923. By adding sodium hydroxide or calcium hydroxide to this in an aqueous solution, a sodium salt (polymer A) and a calcium salt (polymer B) were obtained.

Example 1 A 0.05% aqueous solution of each dispersant shown in Table 1 (adjusted to 4°Dll with calcium chloride) was placed in a 4-5O shaking tube at 50C.
c and solid particles [iron oxide (Fe203): 0.05
g or carbon black: 0.01 g], and after shaking vigorously, ultrasonic waves were applied for 5 minutes to completely disperse the mixture. Leave it undisturbed at a constant temperature (25°C) for 4 hours in the case of iron oxide, 8 hours in the case of carbon black).

Next, sampling was performed from a fixed location (3c+n from the liquid level), absorbance was measured, and dispersion ability was measured. Wavelength is iron oxide - 575nm, carbon black: 420n
It is m.

In addition, a case where the test was conducted under the same conditions without adding a dispersant was used as a blank. The results are shown in Table 1.

Table 1 When the polymer of the present invention is added, the initial dispersion state is maintained, but when other polymers are added, the dispersion cannot be maintained.

Example 2 The cleaning agents shown in Table 2 were prepared and a cleaning power test was conducted using the following method. The results are shown in Table 2.

<Cleaning power test> Five pieces of 10 cm x locm muddy soil-stained cotton cloth 9 (artificially contaminated cloth) were placed in detergent aqueous solution 11, and washed with a turbotometer at lQQ rpm under the following conditions.

The washing conditions are as follows.

(Cleaning conditions) Cleaning time: 10 minutes Cleaning concentration: 0.133% Water hardness: 4° Dll Water temperature: 20°C Cedar 5 minutes with tap water The cleaning power is the reflectance of the original cloth before contamination and the contaminated cloth before and after cleaning. It was measured with a colorimeter (manufactured by Shimadzu Corporation), and the cleaning rate (%) was determined using the following formula.

(The table shows the average value measured for 5 sheets.) Cleaning rate (%) - *) Mud soil contaminated cloth, artificially contaminated cloth) Akadama soil for Kanuma gardening was dried at 120°C ± 5°C for 4 hours and then crushed, 150 120℃ for mesh (100μm) pass
After drying at ±5°C for 2 hours, ±150g was dispersed in 10001 percrene, and a Kanayama #2023 cloth was brought into contact with the liquid and brushed to remove the dispersion and remove excess dirt (Japanese Patent Laid-Open No. 55-26473 issue).

−7= Table 2 Applicant's agent Kaoru Furutani = 8-

Claims (1)

[Scope of Claims] 1. A polymer of α,β unsaturated carboxylic acid or a copolymer with α,β unsaturated carboxylic acid, in which an organic mercaptan having an average molecular weight of 3,000 or less and having 6 to 18 carbon atoms is used as a telogen. Dispersants consisting of alkaline earth metal salts copolymerized with possible vinyl monomers. 2. A cleaning agent comprising the dispersant according to claim 1.