JPH078998B2 - High-density powdered nonionic detergent composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-density powdery or granular nonionic detergent composition having improved cleaning performance and anti-caking property.

[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 powdered and granular detergents containing a large amount of them generally do not have good caking resistance.

In recent years, there has been an increasing demand for compact detergents, and the detergents have been densified. However, when the detergents are densified, the caking resistance tends to be further deteriorated. Some studies have been conducted to improve the powder properties of such high-density powdery nonionic detergents.

For example, JP-A-53-43710 discloses that a free-flowing high-density powdery granular detergent can be obtained by impregnating a spray-dried base bead of a builder with a nonionic surfactant. No. 62-263299 discloses a high-density powder that does not exude the nonionic surfactant by crushing the solid detergent obtained by kneading and mixing zeolite, light sodium carbonate and the nonionic surfactant. It is described that a granular detergent is obtained.

However, even with these known high-density powder and granular detergent compositions, the caking resistance is still insufficient.

The present inventors previously found that by using heavy sodium carbonate and light sodium carbonate in a specific ratio, a high density powdery granular nonionic detergent composition having good caking resistance can be obtained (special feature Japanese Patent Application No. 1-51223). However, the cleaning performance of this detergent composition is not always satisfactory.

[Means for Solving the Problems]

As a result of further intensive studies to solve the above-mentioned problems, the present inventors have found that if sodium pentametasilicate pentahydrate and light sodium carbonate having an apparent density of less than 1 g / ml are used in a specific ratio, anti-caking property is obtained. The inventors have found that a high-density powdery granular nonionic cleaning composition having further improved detergency can be obtained without deteriorating the effect of the present invention, and completed the present invention. That is, the present invention uses a nonionic surfactant as a main washing base, (a) granular sodium metasilicate pentahydrate having a particle size of 250 to 2500 μm, and (b) sodium carbonate having an apparent density of less than 1 g / ml,
(A) / (b) 0.5 to 2.5 by weight ratio, (a) + (b) 30 to 80% by weight of the total content, to provide a high-density powdery nonionic detergent composition. .

The nonionic surfactant used in the present invention has an alkyl group or an alkenyl group having an average carbon number of 10 to 18,
Polyoxyethylene alkyl ether or polyoxyethylene alkenyl ether having 1 to 20 mol of ethylene oxide added thereto, polyoxyethylene alkylphenyl having an alkyl group having an average carbon number of 6 to 12 and having 1 to 20 mol of ethylene oxide added thereto Examples include ether. Usually, these nonionic surfactants have HLB of 8 to 1
8, preferably 8.5 to 13 are used.

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

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

The (a) granular sodium metasilicate pentahydrate used in the present invention has a particle size in the range of 250 to 2500 μm, preferably 300 to 1500 μm. In particular, those having a particle size of 1000 μm or less have a particle size distribution of 70% or more, those having a particle size of more than 1000 μm have a particle size distribution of 30% or less, and those having an average particle size of 600 to 950 μm are desirable. Conventionally, powder, crystalline powder or liquid sodium silicate is often used for 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 1 g / ml, preferably 0.8 g / ml or less.

In the high-density powdery granular nonionic detergent composition of the present invention, the blending ratio and blending amount of granular sodium metasilicate pentahydrate and light sodium carbonate are particularly important. If the blending amount of granular sodium metasilicate pentahydrate and light sodium carbonate is within the range specified in the present invention, the cleaning performance is improved without impairing the caking resistance and the apparent density is 0.6 g / ml.
The above high-density detergent can be easily obtained by a simple production method such as dry blending. Also, (a) + (b)
The compounding ratio of / nonionic surfactant is preferably from 2 to 6.

In the present invention, a polycarboxylic acid polymer can be blended for the purpose of further improving the anti-caking property.

Examples of such polycarboxylic acid polymers include homopolymers or copolymers of acrylic acid, hydroxyacrylic acid, methacrylic acid, and arrayic acid, copolymers of maleic anhydride and olefin, and salts of these polymers. And a polycarboxylic acid salt is particularly preferable. The polycarboxylic acid polymer preferably has a molecular weight of 1,000 to 20,000. Further, the polycarboxylic acid polymer is blended in the composition in an amount of 0.1 to 5% by weight, preferably 0.3 to 2% by weight. The high-density powdery nonionic detergent composition of the present invention may optionally contain other detergent common ingredients. May be blended Zeolites, powdered and granular builders such as tripolyphosphate, oritophosphate, especially zeolite and sodium tripolyphosphate have the effect of improving the fluidity of the detergent, and therefore should be blended in the composition in an amount of 5 to 40% by weight. preferable. In addition, anionic surfactants such as alkylbenzene sulfonate, alkyl sulfate, α-olefin sulfonate and higher fatty acid salt; bleaching agents such as persulfate and percarbonate; glucose pentaacetate, acetoxybenzene sulfonate Sodium, sodium nonanoyloxybenzene sulfonate,
Tetraacetylethylenediamine and JP-A-63-3156
Bleach activators as described in Japanese Patent Publication No. 66; anti-redeposition agents such as carboxymethyl cellulose, polyethylene glycol; cellulases, proteases, amylases,
Enzymes such as lipase; fluorescent dyes; fragrances; extenders such as Glauber's salt can be added.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. In the examples,% is based on weight unless otherwise specified.

Examples 1 to 4 and Comparative Examples 1 to 3 Granular sodium silicate, light ash and sodium tripolyphosphate having the composition shown in Table 1 were put in a Nauta mixer.
Add nonionic surfactant with stirring and absorb it, then add the remaining ingredients and mix uniformly to prepare various high density powdered granular nonionic detergent compositions, which have apparent density and anti-caking The sex was evaluated according to the following criteria. The results are shown in Table-1.

<Apparent density> According to JIS, K 3362 6-2.

<Caking resistance> A sample of a high-density powdery nonionic detergent composition for evaluation 130g was put in a filter paper box, and a load of 250g was applied to it, at 30 ° C, 40-80% R.
It was stored in a caking test chamber of H (96 Hr / cycle) for 10 days, the sample was taken out gently, the weight ratio of the detergent solidified to 5 mm or more with a sieve having an inner diameter of 5 mm was determined, and the ease of caking was evaluated. The smaller the value, the better the caking resistance.

<Cleaning power for protein stains> Blood / milk / carbon contaminated cloth (Swiss EMPA No.116
(Cotton) was used for cleaning at 60 ° C. for 15 minutes, and the cleaning rate was evaluated.

The evaluation results are shown in Table 1.

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

Example 5 and Comparative Examples 4 and 5 Similarly to Examples 1 to 4 and Comparative Examples 1 to 3, a high-density powdery granular nonionic detergent composition having the composition shown in Table 2 was prepared, and Examples 1 to 4 and Similar to Comparative Examples 1 to 3, the respective apparent densities, caking resistance and protein stain cleaning power were evaluated. The results are shown in Table-2.

Claims (1)

[Claims] 1. A nonionic surfactant as a main cleaning base,
(A) Granular sodium metasilicate pentahydrate having a particle size of 250 to 2500 μm and (b) sodium carbonate having an apparent density of less than 1 g / ml, (a) / (b) weight ratio of 0.5 to 2.5, (a) +
(B) A high-density powdery nonionic detergent composition containing 30 to 80% by weight in total.