JPH0437879B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a composition of a solid chlorine bleach that produces hypochlorous acid or hypochlorite in an aqueous solution and is stable and capable of high-speed continuous tableting. Powdered chlorine bleach that produces hypochlorous acid or hypochlorite in an aqueous solution has good bleaching performance,
Because of its sterilizing properties, it is used for purposes such as bleaching household clothes, sterilizing septic tanks, and swimming pools. These bleaching agents include trichloroisocyanuric acid, dichloroisocyanuric acid, potassium dichloroisocyanurate, and dichloroisocyanurate. Examples include sodium isocyanurate, dichlorodimethylhydantoin, tetrachloroglucoruril, and salami powder. However, these chlorine bleaches have poor stability during storage and decompose to generate chlorine gas. As a result, undesirable effects on the human body such as irritating odors and allergies, and inconveniences such as corrosion of packaging containers occur. Therefore, solid chlorine bleaches such as dichloroisocyanuric acid, potassium dichloroisocyanurate, and sodium dichloroisocyanurate are industrially produced in large quantities because of their excellent stability. It goes without saying that these chlorine bleaches can be used in powder form, but it is convenient to use them in the form of tablets for one-time use. However, if chlorine bleach is stored as is, it absorbs moisture from the air and decomposes, reducing the amount of available chlorine, so it must be stored in an aluminum/polyethylene laminate or the like. However, when mass-produced in a factory, there are inevitably pinholes that cannot be detected with the naked eye, resulting in moisture absorption and decomposition during storage after reaching the consumer. Under such circumstances, the present inventor conducted intensive research to overcome the above-mentioned drawbacks, and found that when sodium benzoate is added to the above-mentioned chlorine bleach, the decrease in available chlorine due to moisture absorption is significantly prevented; The present invention was completed based on the discovery that this sodium benzoate exhibits an extremely excellent lubricating effect during tableting, making continuous high-performance tableting possible. That is, the present invention uses a solid chlorine bleach selected from sodium dichloroisocyanurate, potassium dichloroisocyanurate, and dichloroisocyanuric acid and sodium benzoate in a weight ratio of 98/2 to 80/20. The present invention provides a chlorine bleach composition in tablet form containing the following: In the present invention, the mixing ratio of chlorine bleach and sodium benzoate is from 98/2 to 98/2 in terms of weight ratio.
The ratio is in the range of 80/20, and if it is less than this, the effect is insufficient, and if it is more than this, no further improvement in the effect is observed. The composition of the present invention can be prepared by simply mixing chlorine bleach and sodium benzoate, and the manufacturing method is not particularly limited.
It is preferable to use particles with a particle size of 95% or more that pass through a 16-mesh sieve. The composition of the present invention may further include sodium sulfate, sodium bicarbonate, sodium carbonate,
Sodium tripolyphosphate, sodium pyrophosphate, monosodium phosphate, disodium phosphate,
inorganic salts as diluents, such as sodium phosphate;
Organic acids such as citric acid, oxalic acid, tartaric acid, and succinic acid or their sodium salts, sodium nitrilotriacetate, sodium ethylenediaminetetraacetate, polyethylene glycol (molecular weight 2000-20000), carboxymethylcellulose sodium salt, hydroxyethylcellulose, sodium alkylbenzene sulfonate, Organic acid salts such as sodium alkyl sulfate, sodium alkyl sulfonate, polyethylene glycol alkyl ether, polyethylene glycol alkyl phenol ether, polymer compounds, metal chelating agents, anionic surfactants,
Nonionic surfactants, etc., as well as fragrances, pigments,
Conventional ingredients can be added to make products for applications such as bleaches, bleaching detergents, septic tank disinfectants, pool disinfectants, dyes, etc. Furthermore, in tabletting the composition,
Binders such as hydroxypropyl cellulose, carboxymethyl cellulose, sorbitol, sodium polyacrylate, and corn starch; excipients such as mirabilite and common salt; blowing agents such as sodium bicarbonate, disintegrants, and the like can be blended. In addition, when making tablets, the amount of sodium benzoate to be blended may be within the above range, but when obtaining a product with relatively high hardness, it should be 1 to 3% (w/w) of the total composition, and a product with a low hardness should be used. In this case, it is preferably 5% (w/w) or more of the total composition. Tablet compression can be carried out by any method known per se. In the case of the composition of the present invention, tablets could conventionally be compressed only at low speed using a single-shot tablet machine, but a rotary tablet machine can be used. The tablet machine can compress more than 400 tablets per minute. Next, an example will be given and explained. Example 1 3 g of each of the compositions (A to E) shown in Table 1 were compressed into tablets, sealed in aluminum pillow packaging, one hole with a diameter of 0.5 mm was made in the packaging, and the mixture was heated at 40°C and 80% RH. The sample was stored in a constant temperature and humidity room for 20 days, and the available chlorine was measured. Store 30 samples of each sample for 10 days and 20 days.
Five pieces were arbitrarily taken out each day, the packaging was opened, and the available chlorine was measured. The results are shown in Table-2.

【table】

[Table] Example 2 Put 5 g of each of the compositions shown in Table 3 into aluminum pillow packaging, make a pinhole with a diameter of 0.5 mm in the same manner as in Example 1, and store it in a room at 40°C and 80% RH for 20 days. The available chlorine was measured. The results are shown in Table-4.

【table】

[Table] Example 3 Tablets were manufactured from the compositions shown in Table 5 by a direct compression method.

【table】

[Table] As a result of compressing each sample with a rotary tablet machine,
Inventive products 6 and 7 exhibited good tableting properties without adhesion to the kinematics or capping, and could be compressed for 1 hour continuously at a rate of 500 tablets per minute, but comparative products 4 and 5 had a different composition. The frictional resistance of the material was large, causing the tablet press to squeak and stick to the kinematics, making it impossible to press tablets. The weight, hardness, and appearance of the tablets of invention products 6 and 7 are shown in Table 6.

【table】

Claims (1)

[Claims] 1 Solid chlorine bleach selected from sodium dichloroisocyanurate, potassium dichloroisocyanurate, and dichloroisocyanuric acid and sodium benzoate in a weight ratio of 98/2 to 80/20.
A chlorine bleach composition comprising: