JPH0489899A - High-density powdery non-ionic detergent composition - Google Patents

Abstract

PURPOSE:To obtain the title composition which is excellent in cleaning performance and caking resistance by using a non-ionic surfactant as the main detergent base and mixing therewith prescribed sodium silicate and light sodium carbonate particles in specific conditions. CONSTITUTION:The title composition comprises a non-ionic surfactant, such as polyoxyethylene ether, as the main detergent base and, mixed therewith, particles of sodium silicate(A) and light sodium carbonate(B) having particle sizes of 250 to 2500mu, a weight ratio of the component (A) to the component (B) of 0.5 to 2.5, and the total amounts of components (A) and (B) amounting to 30 to 80wt.% of the whole components.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dense, granular, nonionic detergent composition with improved cleaning performance and caking resistance.

[Conventional technology and its problems]

Nonionic surfactants are used as the main cleaning base for detergents that require low foaming properties. However, many nonionic surfactants are sticky, and granular detergents containing large amounts of nonionic surfactants generally have poor caking resistance.

In recent years, there has been an increasing demand for compact detergents, and detergents are becoming more dense, but as the density increases, the caking resistance tends to worsen.

Several studies have been conducted to improve the powder properties of such high-density nonionic detergents.

For example, Japanese Patent Application Laid-Open No. 53-43710 discloses that a free-flowing, high-density granular detergent can be obtained by impregnating spray-dried Bilgoo basic beads with a nonionic surfactant. 62-263299 discloses that a solid detergent obtained by kneading and mixing zeolite, light sodium carbonate, and a nonionic surfactant is crushed to produce a high-density powder that does not seep out the nonionic surfactant. It is stated that a granular detergent is obtained.

However, even these known high-density granular detergent compositions have insufficient vermilion caking resistance.

The present inventors have previously discovered that by using heavy sodium carbonate and light sodium carbonate in a specific ratio, a high-density powdery nonionic detergent composition with good caking resistance can be obtained (particularly (Ganhei No. 1-51223). However, the cleaning performance of this detergent composition is not necessarily satisfactory.

[Means to solve the problem]

The inventors of the present invention have conducted further intensive research to solve the above problems, and have found that if granular sodium silicate and light sodium carbonate are used in a specific ratio, high density The inventors discovered that a powdery nonionic detergent composition can be obtained and completed the present invention.

That is, in the present invention, a nonionic surfactant is used as the main cleaning base, and (a) the particle size is 250 to 2500 I! m of granular sodium silicate and (b) light sodium carbonate, (a)/(b)
) 0.5 to 2.5 in weight ratio, 3 in total amount of (a) + (b)
The present invention provides a high-density powdery nonionic detergent composition characterized by containing 0 to 80% by weight.

As the nonionic surfactant used in the present invention, polyoxyethylene alkyl ether or polyoxyethylene alkenyl ether has an alkyl group or alkenyl group having an average carbon number of 10 to 18, and has 1 to 20 moles of ethylene oxide added thereto. , polyoxyethylene alkylphenyl ether having an alkyl group having an average carbon number of 6 to 12 and to which 1 to 20 moles of ethylene oxide is added. Usually, these nonionic surfactants have a B value of 8 to 18, preferably 8.5 to 13.

Among the above nonionic surfactants, polyoxyethylene alkyl ethers are preferably used.

In the present invention, the nonionic surfactant is present in the composition from 5 to 50%.
It is blended in an amount of 30% by weight, preferably 8 to 20% by weight.

(a) Granular sodium silicate used in the present invention has a particle size of 250 to 2500 tm, preferably 300 to 1500 tm.
Those within the range of ρ are used. Especially when the particle size is 1000
The particle size distribution is 70% or more for those below - and 30% or less for those exceeding 1000-, with an average particle size of 600 to 95
It is desirable that the thickness be in the range of 0 μm. Examples of the sodium silicate include sodium metasilicate and sodium orthosilicate. Particularly preferred is sodium metasilicate pentahydrate. Conventionally, powder, crystalline powder, or liquid sodium silicate has been frequently used in detergents, but these deteriorate the caking resistance.

The apparent density of (b) light sodium carbonate (light ash) used in the present invention is less than Ig/d, preferably 0.8
g/d or less.

The blending ratio and blending amount of granular sodium silicate and light sodium carbonate are particularly important in the high-density granular nonionic detergent composition of the present invention.The blending ratio and blending amount of granular sodium silicate and light sodium carbonate are specified in the present invention. A high-density detergent with an apparent density of 0.6 g/af or more, which has improved cleaning performance without impairing caking resistance, can be easily obtained using a simple manufacturing method such as tri-blend, within the range of I can do it. Also, (a) + (b) /
The blending ratio of the nonionic surfactant is preferably 2 to 6.

The present invention may further contain a polycarboxylic acid polymer for the purpose of improving caking resistance.

Such polycarboxylic acid polymers include homopolymers or copolymers of acrylic acid, hydroxyacrylic acid, methacrylic acid, maleic acid, copolymers of maleic anhydride and olefins, and salts of these polymers. Among them, polyacrylates are particularly preferred. The molecular weight of the polycarboxylic acid polymer is preferably 100 to 20,000.

In addition, the high-density granular nonionic detergent composition of the present invention, in which the polycarboxylic acid polymer is blended in an amount of 0.1 to 5% by weight, preferably 0.3 to 2% by weight, may be used in other detergents commonly used. Ingredients may be mixed arbitrarily.

Powdered building blocks such as zeolite, tripolyphosphate and orthophosphate, particularly zeolite and sodium tripolyphosphate, have the effect of improving the fluidity of the detergent, and are therefore preferably incorporated in the composition in an amount of 5 to 40% by weight. In addition, anionic surfactants such as alkylbenzene sulfonates, alkyl sulfates, α-olefin sulfonates, and higher fatty acid salts; bleaching agents such as perborates and percarbonates; glucose pentaacetate, sodium acetoxybenzenesulfonate , Sodium Nonanoyloxybenzenesulfonate, Tetraacetylethylenediamine and JP-A-63-
Bleach activators such as those described in Publication No. 315666; re-staining preventive agents such as carboxymethyl cellulose and polyethylene glycol; enzymes such as cellulase, protease, amylase, and lipase; fluorescent dyes; fragrances; bulking agents such as Glauber's salt, etc. Can be blended.

〔Example〕

EXAMPLES The present invention will be explained in more detail in Examples below, but the present invention is not limited to these Examples. Note that the percentages in the examples are based on weight unless otherwise specified.

Examples 1 to 4 and Comparative Examples 1 to 3 Granular sodium silicate, light ash, and sodium tripolyphosphate were placed in a Nauta mixer with the composition shown in Table 1,
Add the nonionic surfactant while stirring and let it absorb, then add the remaining ingredients and mix uniformly to prepare various high-density granular nonionic detergent compositions, and evaluate the apparent density and caking resistance of each. It was evaluated based on the following criteria. The results are shown in Table-1.

<apparent density> Conforms to JIS, K 33626-2.

<Caking resistance> 130g sample of high-density powdery nonionic detergent composition for evaluation
Place it in a filter paper box, apply a load of 250g, and rotate it at 30°.
C. Store in a caking test chamber at 40-80% RH (96 Hr/cycle) for 10 days, carefully remove the sample,
The weight ratio of the detergent solidified to a size of 5 mm or more was determined using a sieve with an inner diameter of 5 mm, and the ease of caking was evaluated. The smaller the value, the better the caking resistance.

<Protein stain cleaning power> Blood/milk/carbon contaminated cloth (Swiss EMPA N
α116 cotton) was used to wash at 60°C for 115 minutes, and the cleaning rate was evaluated.

The evaluation results are shown in Table 1.

The cleaning rate of the blood/milk/carbon-contaminated cloth was calculated by measuring the reflectance of the cloth before and after cleaning (measurement wavelength: 550 ns+) using the following formula.

Cleaning rate (%) = Table note) Takukoei Chemical Industry ■, Trade name, Sodium metasilicate pentahydrate, Average particle size 813, Particle size distribution: 355-10001Pm-88%, 1000
-141 (bm-12% Example 5 and Comparative Example 4.5 Similarly to Examples 1 to 4 and Comparative Examples 1 to 3, a high density powdery nonionic detergent composition was prepared with the composition shown in Table 2, Similar to Examples 1 to 4 and Comparative Examples 1 to 3, the respective apparent density, caking resistance, and protein stain detergency were evaluated.The results are shown in Table 2.

Claims (1)

[Claims] 1. A nonionic surfactant is used as the main cleaning base, and (a) granular sodium silicate having a particle size of 250 to 2500 μm and (b)
Light sodium carbonate at a (a)/(b) weight ratio of 0.5
~2.5, a high-density granular nonionic detergent composition containing 30 to 80% by weight in total of (a) + (b). 2. The high-density powdery nonionic detergent composition according to claim 1, wherein the sodium silicate is sodium metasilicate pentahydrate.