JPS61242635A - Composition retarded in reactivity or dissolubility with water or acid and alkali aqueous solution and its production - Google Patents

Abstract

PURPOSE:To make the rate of reaction or the like of a core substance small by coating a substance blended with wax having >=40 deg.C m.p. on the core substance showing the reactivity and the dissolubility with water or acid and alkali aq. solns. and thereafter coating the hydrophobic fine powder thereon. CONSTITUTION:One or more kinds of substances selected from among natural/ synthesized wax having >=40 deg.C m.p., high alcohol, fatty acid amide, fatty acid ester and fatty acid are melted. A core substance showing the reactivity and the dissolubility with water or acid and alkali aq. solns. is dispersed in the melted liquid and also one or more kinds of a surface-active agent and the hydrophilic fine powder are added in accordance with the necessary. Then after spraying the mixture with the use of an atomizer and cooling it, the composition retarded in the reactivity and the dissolubility with water or acid and alkali aq. solns. is obtained by mixing the hydrophobic fine powder thereto, crushing and/or mixing and stirring the mixture.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a composition with delayed reactivity or solubility with water or an acid/alkali aqueous solution, and a method for producing TjA thereof, which is particularly inexpensive. [1] - The coating material to release the liquid must be based on wax with a melting point of 40°C or higher, and has an appropriate balance of affinity with the core substance and affinity with water. The melt of this is used to react or tit
The present invention relates to a composition coated with a wax in which a dissolving core substance is dispersed and a method for producing the same.

[Conventional technology]

When it comes into contact with water or an acid/alkaline aqueous solution, it reacts, hardens, generates gas, etc.9, and dissolves in water.
It causes a thickening effect and a large number of small piles of cement are produced.
~2 Blowing agents, 2 heating elements, and thickeners are widely used.

However, although many of these have high reactivity or high solubility f1 and are fast-acting, they do not have a long pot life when used, and often cause problems in the process of manufacturing the product. Or, for LC that generates gas or heats up quickly,
There are problems such as zeroing for a long time and the reaction being sustained.

For example, there is a known method in which carbide and water are sown on a pipe apple and the generated abrane promotes the growth of the pipe apple, but since carbide is highly reactive, it is effective immediately after sowing. It should be sown in the evening and at night, when the promoting effect is effective. Therefore, acetylene is generated after sowing J-
What is desired is a carbide that has a pot life up to the point where it can be used, and a release η that is determined by the time it takes.

Therefore, in order to avoid delaying the start of the reaction, slow down the reaction rate, and sustain the reaction for a long time, methods of coating with water-soluble polymers such as vA mist drying method and fluidized drying method, etc. ] Nrelevation.

Micro-ITI capsule technology, which forms an organic polymer film, is known, such as interfacial polymerization.

(Problem to be solved by the invention) However, the former method of forming a water-soluble polymer coating by a drying method cannot be applied because it reacts with water. It is impractical to use on an industrial scale.

Therefore, the present invention coats a core material that exhibits reactivity or solubility with water or an acid/alkaline aqueous solution with a coating material, thereby achieving an inexpensive and reliable release method! 7. The purpose is to provide a method for producing animal animals.

[Means for solving problems]

In order to achieve the above objectives, the composition of the present invention includes natural/synthetic wax with a melting point of 40°C or higher, higher alcohol, fat 11/ It is coated with only one substance among amide, fat 11/i acid ester, and fatty acid, or with a coating substance in which a surfactant and a species of hydrophilic fine powder d are added. , which is further characterized in that it is coated with hydrophobic +11 fine powder.

Here, core substances that exhibit reactivity or solubility with water or acid/alkaline aqueous solutions include: For example, Yaisei To(.

Baking soda, aluminum, iron, carbide, polyvinyl alcohol, methyl l? [J-S et al.

Delays the time this core material comes into contact with water! To this day,
1. Heat-melting substance 9. For example, melting point 40.
Natural 7-containing wax, higher alcohol. Fatty acid amide, fatty acid ester.

Cover one or more substances in fatty acids. Water is trapped in this coating material and is prevented from contacting the core material. The contact time is controlled by the hydrophobicity of the coating material, the degree of coating, the physical properties of the additives imparting hydrophilicity, and the particle size of the additive composition. (i) The more hydrophobic the coating, the longer the delay time until the core substance reacts or dissolves when it comes into contact with water. Then, the paraffin h is delayed. By mixing these appropriately, it can be adjusted.

As for the wax, it is desirable to have a melting point of 40°C or higher.''
A temperature of approximately 45-80°C is preferable. Carpuba wax, beeswax, 71 Zokurai 1~.
Examples include paraffin wax.

Among these, paraffin wax is inexpensive, and those with various melting points are difficult to handle manually, especially when sprayed and granulated.
A dense coating is desirable.

Compatibility with the core substance can be controlled by various types of f18 compounds based on paraffin. In addition, even if you use the same material, it will be uniform and adhesive-7.
The effect is different when one is completely covered and when it is partially covered. In other words, there is a delay in completely covering vM'7I. Therefore, the coating state can be changed and adjusted by adjusting the amount ratio of the core material to the coating material (1) and the affinity between the two and the manner of mixing.

On the other hand, since the above-mentioned waxes and the like alone have poor wettability with water and the melt/dispersion system is unstable, a coating material may be used in which one or more of surfactants and hydrophilic fine powders are added to these waxes and the like. By adding 31i of these, the melt dispersion system can be stabilized, spraying becomes easier, coating is uniform,
The water wettability of the coating material is also improved. Furthermore, by adding hydrophilic fine powder, the delay time can be appropriately shortened.

Examples of the surfactant include glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene al-1-nyl-1-del, poly'A-1 diethylene nonylph]nol ether, and the like.

The hydrophilic fine powder may be finer than the core material.50μ or more, preferably 10μ
Silica, aluminium, butane oxide, calcium carbonate, perlite, and silica of less than μ.

Starch, calcium chloride, potassium chloride, polyvinylalnicol, water glass, carboxymethyl cell [1-
S, Barai 1~. Examples include activated bamboo charcoal, acrylate] and Jt polymer of polyvinyl alcohol. Added fJI
() depends on the particle size and specific gravity of the core material and coating material,
Generally O,,01Th・30%, preferably 0.1-1
0% is good.

'N1 ~ Roll release is the ratio of core material to coating material,
In addition to the type of wax used as the coating material, the mixture composition, the addition ratio of the surfactant and the hydrophilic fine powder, and the spraying speed when using the @n granulation method described below.

b can be adjusted by the spray pressure, the temperature of the spray gas, etc.

Further, the above-mentioned coating material is coated with hydrophobic T'l fine powder.

This creates double coating layers, and the delay time can be finely adjusted by adjusting each coating layer.

Hydrophobic fine powders include stearic acid silylating agents,
Silane coupling agent, aminosilane.

Starch or silica with a particle size of 50/l or less, preferably 10μ or less, which has been hydrophobized with silicone oil or the like.

Examples include fine powders of titanium oxide, calcium carbonate, and the like.

Incidentally, since the degree of coverage of the coating substance is often uneven when the particle size of the composition is small, the (-l) delay time can be adjusted by adjusting the particle size.

Examples of the method 11 for producing the composition mentioned above include those mentioned above.

■ Natural/synthetic waxes with a melting point of 40°C or higher, high-grade alkylene, fatty acid amide, fatty acid Nisdel.

Melt one or two substances among fatty acids, disperse the core substance therein, add a surfactant and one or more types of hydrophilic fine powder as necessary, and then spray this. The mixture is sprayed and cooled by spraying, mixed with fine hydrophobic bamboo powder and pulverized, or mixed and stirred after pulverization to obtain a composition coated with the core material.

The ratio of the core material to the coating material in this melt-dispersed system is 40 to 200 parts by weight per 100 parts by weight of the core material, approximately 116 parts by weight.
0 to 150 parts by weight is desirable. Dispersing the core material in the melt requires at least t, 40 parts h)-11 parts or more, and it is impractical to use too much coating material. Each persimmon organic solvent can also be used to avoid substantially reducing the proportion of coating material. The amount added is wax, etc. (
0.01 to 30% for this, preferably 0.1 to 10% for t.
Use J”ru.

■ Natural/synthetic waxes, higher alcohols, fatty acid amides, and fatty acid esters with a melting point of 40°C or higher.

A molten coating material containing only one or two fatty acids, a surfactant, and one or more hydrophilic fine powders added thereto and a core material are mixed and stirred at room temperature to form a coating material on the core material. Coating 1. After that, the hydrophobic fine powder is mixed and stirred at room temperature, or the hydrophobic bamboo fine powder is mixed from the beginning and mixed and stirred at room temperature to obtain a composition coated with the core material.

■ Mix the molten coating material and core material produced as in (■) above at a temperature above the melting point of the coating material and below the melting point or thermal decomposition point of the core material to create a slurry, F to cold 1. II L, /,: Post-pulverized, and further mixed with hydrophobic fine powder and crushed F) l, < 4
1 Mix and stir after pulverization, or mix hydrophobic fine powder from the beginning and mix at a temperature above the melting point of the coating material and below the melting point or thermal decomposition point of the core material to create a slurry, and then mix this at a temperature below the melting point of the coating material. The mixture is cooled for 1 hour and then pulverized or mixed and stirred after pulverization to obtain a composition coated with a core material.

In the case of methods ① and ②, the ratio of the core material to the coating material is 1.
10 to 200 parts by weight per 00 parts by weight, preferably 30 to 200 parts by weight. The ratio of hydrophilic fine powder in the coating material is desirably 0.1 to 50 parts by weight per 100 parts by weight.

In addition, when a coating material with a low melting point is used, it is easier to coat the core material when crushed or mixed, but it tends to aggregate, so cooling is required in that case.

In particular, during pulverization, low-temperature pulverization using liquid nitrogen or dry ice is effective.

In addition, the crusher and mixing agitator are cutter F4 agitators.

Jet mill, turbo mill, ball mill, dish granulator,
A1 - General items such as lighters can be used.

[Efficacy of invention Song Dynasty]

Since the composition of the present invention is configured as described above, it is possible to delay the reaction and dissolution of the core material exhibiting reactivity or dissolution tz1 with water or acid/alkaline aqueous solutions, and to set a pot life. can be done. In addition, the affinity with the core substance and the affinity with water are determined by the type of wax, etc.

It can be adjusted by adding surfactants, hydrophilic properties, hydrophobic fine powder, etc. Also, the above-mentioned spray granulation method or pulverization.

By mixing, stirring, etc., it is possible to obtain a composition in which the agent is released reliably and at low cost.

〔Example〕

Examples of the present invention are shown below.0 Example 1 Baking soda powder (average particle size 100/1) 100 heavy hanging parts melting point 5
100 parts of paraffin wax at 8°C and 1 part of barley
~1 part by weight was mixed, heated to 70°C, coated with baking soda, allowed to cool and solidify, and crushed with a stirrer equipped with a cutter to form hydrophobic silica fine powder (product name: Nippon Atcho 1] Zil RO72). After adding 1 small part of ic o and pulverizing it further, 1 q of the resulting powder was added to a water slurry of cement 1~, and when a small amount of phosphoric acid was added and mixed into the powder, the result was that compared to untreated baking soda, ,
The start of foaming was delayed by 15 seconds 9. Example 2 100 parts by weight of baking soda powder (average particle size 100μ) had a melting point of 58
70 parts by weight of paraffin wax and 1 part by weight of 30 parts polyoxyethylene nonylphenol ether were added and heated to 85°C to prepare a molten wax slurry of baking soda, which was left to solidify and was crushed with dry ice using a cutter and a stirrer. To this was added 3 parts of fine silica powder treated with silicone oil, and the mixture was heated at 100 r, l'1. The mixture was coated with IIl for 3 minutes with intermittent stirring.

When this powder was mixed into the citric acid aqueous slurry of Cement 1~, the start of foaming was delayed by 20 seconds compared to untreated sodium bicarbonate.

Claims (1)

[Claims] 1. The core material exhibiting reactivity or solubility with water or acid/alkaline aqueous solutions includes a natural/synthetic wax with a melting point of 40°C or higher;
A coating material containing only one or more substances selected from among higher alcohols, fatty acid amides, fatty acid esters, and fatty acids, or a surfactant and one or more types of hydrophilic fine powder added thereto, is further coated with a hydrophobic fine powder. A composition having delayed reactivity or solubility with water or an acid/alkaline aqueous solution. 2. After melting one or more substances among natural/synthetic waxes, higher alcohols, fatty acid amides, fatty acid esters, and fatty acids with a melting point of 40°C or higher, there is no reactivity or solubility with water or acid/alkaline aqueous solutions. In addition to dispersing the core material exhibiting Grinding and/or
Or, a method for producing a composition in which reactivity or dissolution with water or an acid/alkaline aqueous solution is delayed by mixing and stirring. 3. Melting with only one or more substances among natural/synthetic waxes, higher alcohols, fatty acid amides, fatty acid esters, and fatty acids with a melting point of 40°C or higher, or one or more surfactants and hydrophilic fine powders added thereto. coating material and water or acid.
a core material that exhibits reactivity or solubility with an aqueous alkaline solution;
A method for producing a composition with delayed reactivity or solubility with water or an acid/alkali aqueous solution, which comprises mixing with a hydrophobic fine powder and pulverizing and/or mixing and stirring the same.