JPH0124762B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention contains anhydrous salts and dihydrate salts of alkali metal salts of dichloroisocyanuric acid as main components,
The present invention relates to small tablets for sterilization and bleaching that are rapidly soluble in water and each tablet weighs about 0.2 to 5 g. Traditionally, trichloroisocyanuric acid, dichloroisocyanuric acid, anhydrous salts and hydrated salts of alkali metal salts of dichloroisocyanuric acid have been used as disinfectant bleaches to release available chlorine such as hypochlorous acid in water. However, powder products tend to crumble during use and are not easy to measure, so they are gradually no longer used, and instead granules, tablets, etc. are mainly used. However, the above-mentioned chlorinated isocyanuric acids each exhibit different physical properties; for example, trichloroisocyanuric acid has low solubility in water and low dissolution rate, and is not suitable for rapid-dissolving tablets. As a quick-dissolving type chlorinated isocyanuric acid tablet, a pressure-molded tablet of sodium dichloroisocyanurate dihydrate is disclosed in JP-A-50-48116. However, even if the tablet is sealed, if the temperature rises due to an increase in the outside temperature, the water of crystallization may turn into free water, causing decomposition, and the tablet may become brittle and easily disintegrate during transportation. There is. Furthermore, when the temperature of sodium dichloroisocyanurate dihydrate powder is raised before it is subjected to molding, the water of crystallization changes to free water, which causes the powder to lose its fluidity and make molding difficult. Tablets are also often difficult to obtain. Another example of a rapidly dissolving chlorinated isocyanuric acid tablet is one made by pressure molding the anhydrous salt of sodium dichloroisocyanurate, but this anhydrous salt powder adheres to the mold during molding. In particular, when a tablet press is operated continuously for a long period of time, it may cause squeaking noise, make it impossible to maintain a constant molding pressure, and impede the smooth operation of the machine. Due to the poor interparticle bonding strength of the salt, the resulting tablets have the disadvantage of being prone to crumbling in packaging containers. Still another example is 100 parts by weight of the anhydrous salt of sodium dichloroisocyanurate and the dihydrate or monohydrate of sodium dichloroisocyanurate.
A large tablet consisting of 120 parts by weight or more and 0.3 to 1 part by weight of orthoboric acid is proposed in JP-A-53-136520. The purpose is to provide tablets that rapidly disintegrate in water by utilizing water absorption and swelling phenomenon, but problems such as densification of tablets and prevention of collapse due to vibrations in packaging containers, especially during transportation, have not yet been solved, and furthermore, there is a problem with small tablets. 0.2 to 5 obtained by the method proposed in the bulletin, not for the purpose of providing
Tablets weighing about 1.5 oz. are likely to crumble due to vibrations in the packaging container. Furthermore, if the tablet is made denser to prevent it from collapsing during transportation, rapid dissolution without excessive loss of water absorption and swelling properties in water cannot be achieved. As mentioned above, conventional quick-dissolving chlorinated isocyanuric acid tablets are mainly molded for use in large amounts of water such as swimming pool water, and the tablets may crumble slightly in the storage packaging container. Even if it does occur, it will not cause any serious problems. However, rapidly dissolving chlorinated isocyanuric acid tablets have become more widely recognized for their excellent germicidal bleaching performance as well as their practical safety, and their use in relatively small amounts of e.g.
Demand for application to the following wastewater is emerging in various fields, and approximately 0.2 to 5 g per tablet is suitable for this purpose.
There is a need for something that is reasonably precise and compact.
Such fields of application include, for example, household bath water,
Water for washing walls, ceilings, etc., water for washing leather products, sports equipment, etc., water for washing dishes, etc. in the kitchen, water for washing fishbowls, birdhouses, dog houses, etc., combs, Examples include water used to wash daily necessities such as socks, and water used to clean nearby unclean objects. Chlorinated isocyanuric acid is usually supplied to the water used for cleaning in an amount that provides an available chlorine concentration of 10 ppm or less. For example, the amount of sodium dichloroisocyanurate supplied in 100 g of water is about 1 to 1.5 g, so the weight per tablet is 0.2 g.
A range of about 2g is desirable. Furthermore, since the weight per tablet or the number of tablets supplied per unit amount of water is often displayed to the user, the weight of each tablet may change due to the tablet being crushed before use. It is desirable that the available chlorine content of the tablets does not change due to deterioration during storage. As described above, small tablets of chlorinated isocyanuric acid must be dense and have excellent storage stability, and must also have the property of quickly disintegrating and dissolving when placed in water. The object of the present invention is to contain rapidly dissolving sodium or potassium dichloroisocyanurate anhydrous salt and sodium dichloroisocyanurate dihydrate as main components, and the weight per tablet is 0.2 to 5.
An object of the present invention is to provide a novel compact sterilizing bleaching tablet with a density of approximately 1.5 g. Still another object is to provide the above-mentioned novel small-sized sterilizing bleaching tablets that do not undergo deterioration during storage and do not collapse even when subjected to vibrations during transportation. The tablet of the present invention is
100 parts by weight of anhydrous sodium dichloroisocyanurate or potassium dichloroisocyanurate with a particle size of 100 to 2000μ, 5 to 100 parts by weight of sodium dichloroisocyanurate dihydrate with a particle size of 100 to 2000μ, and a particle size of 250μ or less These are small tablets for sterilizing bleaching with a density of 1.50 to 1.95 g/cm ³ made by pressure molding a homogeneous mixture containing 3 to 50 parts by weight of talc or orthoboric acid as a main component. The rapid dissolution of a tablet in the present invention refers to the speed at which dissolution is completed within 10 minutes when the tablet is placed in a sufficient amount of water at room temperature. Moreover, the small size of the tablet of the present invention refers to one having a weight of about 0.2 to 5 g per tablet. Sodium dichloroisocyanurate contains 1
Dihydrate salts containing two molecules of water of crystallization in the molecule, monohydrate salts containing one molecule of water of crystallization, and anhydrous salts containing no water of crystallization are known. Further, potassium dichloroisocyanurate is known to have a monohydrate salt containing one molecule of water of crystallization in one molecule and an anhydrous salt containing no water of crystallization at all. Of the above, those used in the present invention are the anhydrous salt of sodium dichloroisocyanurate or potassium dichloroisocyanurate and the dihydrate salt of sodium dichloroisocyanurate, and commercially available industrial products are sufficient. Sodium dichloroisocyanurate or potassium dichloroisocyanurate monohydrate has poor stability, and
Since it is not easy to manufacture, it is not preferable for use in the present invention. The above-mentioned anhydrous salt of sodium dichloroisocyanurate or potassium dichloroisocyanurate and dihydrate of sodium dichloroisocyanurate used in the present invention are dry powders with a particle size of 100 to 2000μ. preferable. If the particle size is less than 100 μm, it is undesirable because it may cause trouble in the smooth continuous operation of the tablet machine during continuous tablet compression using the tablet machine, or it may require an increase in the amount of lubricant. In addition, the particle size is 2000μ
In this case, it becomes difficult to compress into dense tablets, and furthermore, it becomes difficult to obtain a homogeneous mixture of powder, and when the tablet disintegrates and dissolves in water, it tends to lack uniformity. Talc or orthoboric acid (H ₃ BO ₃ ) used in the present invention acts as a lubricant. The smaller the particle size is, the more preferable it is, but commercially available industrial products having a particle size of 250 μm or less may be used. If the particle size is 250μ or more, it is not effective in improving the tableting properties during tableting considering the amount added, and the amount needs to be increased, which lowers the effective chlorine concentration in the tablet, which is not preferable. The tablets of the present invention are obtained by pressure molding a homogeneous mixture of the above-mentioned anhydrous salt of sodium dichloroisocyanurate or potassium dichloroisocyanurate, dihydrate of sodium dichloroisocyanurate, and talc or orthoboric acid in a specific ratio. It will be done. The above specific ratio means 5 to 100 parts by weight of the above dihydrate to 100 parts by weight of the above anhydrous salt, preferably 10 to 100 parts by weight.
40 parts by weight, and 3 to 50 parts by weight of the above-mentioned lubricant. If the mixing ratio of the above-mentioned dihydrate salt is 5 parts by weight or less, the powder tends to adhere to the mold when compressing the homogeneous mixture into tablets.
This makes steady continuous molding difficult, making it difficult to form tablets of constant quality. Moreover, the resulting tablets also tend to become brittle. In addition, if the mixing ratio of the above-mentioned dihydrate salt is 100 parts by weight or more, when the tablet obtained by compressing the mixture is put into water, the disintegration in water becomes poor, the dissolution time is prolonged, and the disintegration time is increased. Hardly soluble. Furthermore, deterioration during storage is more likely to occur. The mixing ratio of the lubricant is 3 to 50 parts by weight for orthoboric acid, particularly preferably 10 to 40 parts by weight, and 3 to 30 parts by weight, particularly preferably 5 to 20 parts by weight for talc. If the mixing ratio of the lubricant is below the lower limit, the moldability of the mixture during tableting will be insufficient, and if it is above the upper limit, the effective chlorine concentration in the tablet will be reduced, which is not preferable. Mixing the above components in the above specific ratio can be easily done using a common powder mixer. Uniform mixing ensures that the tablets obtained from the mixture are of consistent quality. The above-mentioned homogeneous mixture used in the present invention may be one in which the above-mentioned components are mixed in the above-mentioned ratios, or may be one in which desired additives are further mixed as long as the object of the present invention is achieved. For example, it may be preferable to mix in small amounts of suitable colorants, detergents, etc. The tablet of the present invention has a density of 1.5 to
Obtained by pressure molding to a weight of 1.95 g/cm ³ . As a method of pressure molding, a method using an ordinary tableting machine is sufficient. Molding pressure is usually
It is preferably about 100 to 1000 Kg/cm ² , particularly about 400 to 600 Kg/cm ² . The density of the tablets obtained will vary slightly depending on the particle size and distribution of the above-mentioned uniform mixture and the molding pressure, but by molding a uniform mixture of raw materials with the above-mentioned particle size under pressure of 100 to 1000 kg/cm ² . ,
The density of the obtained tablets is approximately 1.50 to 1.95 g/cm ³ . The density of this tablet has an important effect, and the density
If the density is less than 1.50 g/cm ³ , it will easily collapse due to vibration during storage, and if the density is increased to 1.95 g/cm ³ or more, it will cause wear and tear on the tablet press due to high molding pressure, and furthermore, it will disintegrate in water. The properties become poor, and no improvement effect can be obtained despite the increase in density. The fact that the tablets of the present invention exhibit rapid disintegration in water and do not collapse in a storage container is due to the appropriate particle size structure of the powder particles of the homogeneous mixture. This is thought to be due to the fact that densification is achieved when compression occurs, and water permeability from the tablet surface is good in water, so that the water absorption and swelling phenomenon of the anhydrous salt occurs rapidly. Thus, the tablets of the present invention do not change in quality or crumble when stored under airtight conditions, exhibit rapid disintegration and solubility in water, and can be placed as small tablets into water to be purified with a small amount of water. used. Since it has sterilizing, disinfecting, deodorizing, bleaching, and cleaning powers, it is extremely useful for purifying everyday living environments as mentioned above. The present invention will be described below with reference to Examples and Comparative Examples, but the technical scope of the present invention is not limited thereto.
Before proceeding to Examples and Comparative Examples, first, the moldability and tablet performance test methods will be described. (1) Formability Continuous tableting is performed using a rotary tablet press, and the presence or absence of squeaking noise during tableting is examined, and the hardness and external appearance of the obtained tablets are observed using a Kiya hardness tester. . (2) Disintegratability of tablets in water Pour 1.8 ml of water into the beaker from step 2, adjust the temperature to 30±1°C, and then put the tablets into the beaker. Immediately after that, the tablets completely disintegrate and no core remains. Measure the time until it disappears. (3) Storage stability of tablets After placing the tablets in an airtight glass bottle,
Store in a constant temperature room at 35°C, take out the tablet after 3 months, and observe the appearance and properties. Examples and Comparative Examples A homogeneous mixture according to the formulation shown in Table 1 was tableted at a pressure of 500 Kg/cm ² using the above rotary tablet press,
The tablets were molded into tablets each weighing 0.3 g or 1.0 g (in the table, ** indicates 0.3 g, others indicate 1.0 g), and the moldability at that time was observed using the above test method. The tablets were measured for disintegration in water and storage stability using the above test methods, and the results shown in Table 1 were obtained. The examples of the present invention all show good results in moldability, tablet hardness, appearance, disintegration in water, and storage stability, but Comparative Example 1 whose particle size does not meet the requirements of the present invention Creaking noise occurs during molding,
There were many scratches on the side surfaces of the tablets obtained, and the edges of the tablets were considerably collapsed.

[Table] Indicates each mu.
** Indicates that the weight of one tablet is 0.3g.
Furthermore, in Comparative Example 2 in which sodium stearate was used as a lubricant, the hardness of the tablet was low and the disintegration in water was also very poor. In Comparative Example 3, in which the amount of sodium dichloroisocyanurate dihydrate did not meet the requirements of the present invention, squeaks occurred during tablet compression, and deformation was observed at the edges of the resulting tablets. Comparative Example 4 also did not satisfy the requirements of the present invention regarding the amount of dihydrate salt, but the disintegration time in water of the tablet was long;
Storage stability is also poor. Comparative Examples 5, 6, and 7 also did not meet the requirements for the mixing ratio of the present invention, and did not have sufficient moldability, disintegration in water, or storage stability. As shown in the above examples, the tablet of the present invention has excellent practical performance as a small tablet for sterilizing and bleaching.

Claims (1)

[Claims] 1 100 parts by weight of anhydrous salt of sodium dichloroisocyanurate or potassium dichloroisocyanurate with a particle size of 100 to 2000μ, 5 to 5 parts of dihydrate of sodium dichloroisocyanurate with a particle size of 100 to 2000μ
A small tablet for sterilizing bleaching with a density of 1.50 to 1.95 g/cm ³ obtained by pressure molding a homogeneous mixture containing 100 parts by weight and 3 to 50 parts by weight of talc or orthoboric acid with a particle size of 250 μm or less as main components.