JPH0335359B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a composition for stabilizing a powdered chlorine whitening agent that produces hypochlorous acid or hypochlorite in aqueous solution. 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 powdered 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, dichloroisocyanuric acid,
Potassium dichloroisocyanurate, sodium dichloroisocyanurate, and the like are industrially produced in large quantities because of their excellent stability. However, since these substances still do not have sufficient stability, proposals have been made to add certain fragrances and stabilizers such as melamine. However, even with the addition of these stabilizers, the stabilization of chlorine bleach is still insufficient, and it cannot be used as a commercial product for mass consumers, such as household bleach. For example, these powdered chlorine bleaches may be used in powder form, but it is convenient to form them into tablets for one-time use. It is preferable for these tablets to be packaged one by one in aluminum/polyethylene laminate to avoid moisture absorption from the outside. However, if the aluminum is stored for too long, it will corrode and form small pores, which will subsequently reduce its stability. The inventors of the present invention have conducted extensive studies on the stabilization of powdered chlorine bleach, and have discovered that a significant stabilizing effect can be obtained by adding synthetic crystalline A-type zeolite, thereby achieving the present invention. That is, the present invention provides one or more powdered chlorine bleaches selected from the group consisting of sodium dichloroisocyanurate, potassium dichloroisocyanurate, and dichloroisocyanuric acid, and a crystal type A-containing bleach. Weight ratio of 97/3 to 70/30 with zeolite
The present invention provides a stabilizing composition for powdered chlorine bleach, characterized in that it contains a powdered chlorine bleach in a proportion of . The A-type zeolite used in the present invention is a synthetic crystal type and has a skeleton structure represented by the following formula. 6 {(Na ₂ O)・(Al ₂ O ₃ )・2(SiO ₂ )} Zeolite generally has water of crystallization and has a water content of 3 to 25% by weight in a saturated state. Although such a hydrous zeolite may be used, it is preferable to use a zeolite containing no crystal water, preferably less than saturated water of hydration, and more preferably a zeolite containing no crystal water. The weight ratio of chlorine bleach to type A zeolite in the composition of the present invention is selected within the range of 97/3 to 70/30. That is, if the amount of zeolite is small, it will not be sufficiently effective, and if the amount is large, it will just be wasted. In producing the composition of the present invention, although there are no particular limitations, it is preferable to use a powdered chlorine bleach and a zeolite having a particle size of 95% or more that passes through a 16 mesh sieve. The composition of the present invention may further include sodium sulfate, sodium bicarbonate, sodium carbonate,
Sodium tribolyphosphate, sodium pyrophosphate, monosodium phosphate, disodium phosphate,
Inorganic salts as diluents such as trisodium phosphate, sodium citrate, sodium oxalate, sodium tartrate, sodium succinate, sodium nitrilotriacetate, sodium ethylenediaminetetraacetate, polyethylene glycol (molecular weight from 2000 to
20000), carboxymethyl cellulose sodium salt, hydroxyethyl cellulose, sodium alkylbenzene sulfonate, sodium alkyl sulfate, sodium alkyl sulfonate, organic acid salts such as polyethylene glycol alkyl ether, polyethylene glycol alkyl phenol ether, polymer compound metal chelating agent, anion chemical surfactants, nonionic surfactants, etc., as well as fragrances, pigments, dyes, etc., as well as commonly used ingredients to make products for applications such as bleach, bleach detergent, septic tank disinfectant, pool disinfectant, etc. be able to. Hereinafter, the present invention will be explained in more detail with reference to Examples. Note that parts in the examples are based on weight. Example 1

[Table] Compress 3g of each of the five mixtures A to E having the above composition into tablets, seal them in aluminum pillow packaging, and store them in a constant temperature room at 20℃ for 6 months. Corrosion was observed. each sample
I stored 30 pieces at a time, and took out 3 pieces every month at will, tore the packaging, and observed the corrosion of the aluminum inside.
The results are shown in Table 1.

【table】 Implementation example 2

[Table] A-type zeolite was adjusted to various moisture contents to prepare compositions having the above compositions, which were sealed in aluminum pyropackaging in 3 g portions and stored for 6 months. Example 1
Corrosion occurring on the aluminum surface was observed in the same manner. The results are shown in Table 2.

【table】 Example 3

[Table] 1 tablet of a mixture of 4 types of H to K having the above composition
Three 30g tablets were compressed to produce flat cylindrical tablets. This was stored in a 500 c.c. wide-mouth polyethylene bottle with a tightly stopper. It was opened after being stored at room temperature for 6 months.
H had a strong pungent odor of chlorine, but I to K had almost no chlorine odor. Example 4

[Table] The six mixtures L to Q having the compositions shown in the table above were compressed into tablets of 3 g each, sealed in aluminum pyro packaging, stored in a constant temperature room at 40°C, and placed in aluminum pyro packaging. Corrosion occurring on the surface was observed. Nine samples of each were stored, and after 15, 30, and 45 days, three samples were taken out at will, the packaging was torn, and the corrosion of the aluminum inside was observed. The results are also shown in the table above. This accelerated test is approximately equivalent to a 6-month test at 20°C for 45 days at 40°C. From the table above, it can be seen that when synthetic amorphous zeolite is used, it has the effect of suppressing decomposition, but it needs to be blended in a large amount, whereas synthetic crystal type A used in the present invention
It can be seen that zeolite type is effective in small amounts.
Furthermore, when synthetic amorphous zeolite was used, tableting properties were not good. That is, the tablets obtained by compressing compositions O and P, which exhibit a certain degree of decomposition-inhibiting effect, were brittle and easy to break apart by hand.

Claims (1)

[Claims] 1. One or two selected from the group consisting of sodium dichloroisocyanurate, potassium dichloroisocyanurate, and dichloroisocyanuric acid.
1. A stabilized composition for a powdered chlorine bleach, comprising at least one powdered chlorine bleach and a crystal type A zeolite in a weight ratio of 97/3 to 70/30. 2. The composition according to claim 1, wherein the water content of the A-type zeolite is substantially zero.