KR101254490B1 - Micro capsule compound and manufacturing method of said the micro capsule compound - Google Patents

Abstract

The present invention relates to a microcapsule admixture and a method for manufacturing the same, and in particular, the microcapsule admixture for a construction material which can be easily used in the construction field by controlling the setting time of concrete and mortar when it is administered during the production of concrete and mortar, and a method of manufacturing the same. It is about.
The microcapsule admixture of the present invention for this purpose is a microcapsule admixture comprising a core material and a wall material coated on the outer circumferential surface of the core material, wherein the core material includes lithium carbonate as an accelerator and aluminum hydroxide as a accelerator. The wall material consists of a composition comprising an acrylic emulsion or sodium silicate, which is a water soluble polymer.

Description

MICRO CAPSULE COMPOUND AND MANUFACTURING METHOD OF SAID THE MICRO CAPSULE COMPOUND

The present invention relates to a microcapsule admixture and a method for manufacturing the same, and in particular, the microcapsule admixture for construction materials that can be easily used in the construction field by controlling the setting time of concrete and mortar when it is administered during the production of concrete and mortar, and a method of manufacturing the same. It is about.

Microcapsules were developed overseas in the 1950s and have since been applied to food, medicine, and agriculture. Recently, microcapsules have been found not only to control the amount of nuclear emissions but also to protect nuclear materials from the external environment. In particular, they have been applied to the high-tech textile industry since the 1990s. It continues to expand into household goods and other industries.

Microencapsulation application technology has been developed in various countries. The application products include no-carbon paper, pressure-measuring film, and photosensitive recording material. Industrial materials include adhesives and liquid crystal microcapsules. Pesticides, fertilizers, seeds and feed. In addition, it can be applied as a fragrance and cosmetic materials, and is also actively applied in the pharmaceutical industry.

Recently, in Japan and other countries, Capcisine, a spicy ingredient of red pepper, was encapsulated as an animal repellent and developed as a rodent repellent. It was compounded into polyethylen (PE) or vinyl chloride (PVC) and applied to various wire cable coating materials. Develop and produce.

The animal repelling effect of the hot ingredient of red pepper is caused by the pungent stimulus, which is contained in the microcapsules with a high concentration of the hot flavor, so that it can be easily handled by suppressing the stimulus caused by the hot flavor and at the same time when there is an external stimulus. This is because it is expected to enhance the effect of instant release of high concentrations of active ingredients.

The research on microcapsules has been actively studied in developed countries, including the United States, which reveals the mechanism of microencapsulation and the theoretical properties of the microcapsules produced according to the types of stored and external materials that make capsules. Attention is focused on the application. By regulating the rate of release of the contents to the outside, the applied research is being extended to the pharmaceutical and life science fields such as sustained-release drugs. For example, fragrance fragrance fibers, antibacterial fibers that kill bacteria and fungi, antibacterial fibers, thermosensitive fibers that reversibly change color according to temperature changes, and photosensitive fibers that change color depending on light. However, there are no examples of applying microcapsules in the construction field, not only in Korea but also abroad.

In the present invention, in consideration of the above-mentioned conventional problems, when the input to the construction materials, such as concrete or mortar, the condensation time of the material is adjusted to eliminate the inconvenience caused by the use of the fasteners to facilitate the convenient operation of construction equipment, etc. It is an object of the present invention to provide a microcapsule admixture and a method for producing the same.

The microcapsule admixture of the present invention for achieving the above object is a microcapsule admixture comprising a core material and a wall material coated on the outer circumferential surface of the core material, wherein the core material is lithium carbonate and an accelerator as aluminum hydroxide. The wall material is an acrylic emulsion or sodium silicate that is a water-soluble polymer.

The microcapsule admixture of the present invention can be included only lithium carbonate as an accelerator as a core material.

Accordingly, the microcapsule admixture of the present invention includes 30-60% by weight of lithium carbonate as the core material, 20-50% by weight of the acrylic emulsion and 20-50% by weight of sodium silicate as the wall material.

In addition, the microcapsule admixture of the present invention contains 30-50% by weight of lithium carbonate as a core material, 10-30% by weight of aluminum oxide as a fastener, 5-30% by weight of an acrylic emulsion as the wall material, Sodium 5-30% by weight of silicate may be included respectively.

Microcapsule admixture manufacturing method of the present invention for achieving the above object is to use a fluidized bed coater, the step of introducing the core material into the coater of the fluidized bed coater, the step of fluidizing the core material in the coater, wall materials Spraying a material on the outer circumferential surface of the core material, and drying the coated core material.

In the manufacturing method, the core material is lithium carbonate, which is an accelerator, and aluminum hydroxide, which is a accelerator, and the wall material is an acrylic emulsion or a sodium silicate, which is a water-soluble polymer.

The core material includes 30-60% by weight of lithium carbonate, and the wall material includes 20-50% by weight of acrylic emulsion and 20-50% by weight of sodium silicate, respectively.

According to the present invention, by preparing a microcapsule admixture by incorporating a fastener and a promoter into the microcapsules as a core material of the microcapsules, when the construction material such as concrete or mortar is condensed by mixing with cement, The effect can be adjusted by the user.

In addition, the microcapsule admixture of the present invention protects the fastener inside, so it is protected from the fastener that is harmful to the human body and is easy to handle, and delays the initial time to prevent rapid condensation of the material due to the fastener. Compared with this, no additional equipment is required, which can reduce cost and improve construction.

In addition, the microcapsule admixture of the present invention has an advantage that can be applied to various construction materials related to concrete, such as cement, lime, concrete, mortar, artificial marble, sealant, paint.

1 is a diagram illustrating the structure of a microcapsule admixture,
2 is a diagram illustrating the structure of a fluidized bed coater for preparing a microcapsule admixture of the present invention.

Hereinafter, a microcapsule admixture according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating the structure of a microcapsule admixture.

As shown, the microcapsule admixture 10 according to the present invention includes a seed core material 13 located inside the capsule and a wall material 15 coated on the outer circumferential surface of the core material 13. It consists of a configuration.

In the above configuration, the core material 13 includes lithium carbonate (Li ₂ CO ₃ ) and aluminum hydroxide (AI (OH) ₃ ). At this time, in the core material 13, lithium carbonate is an accelerator, and the aluminum hydroxide is an aluminate-based fastener.

The lithium carbonate is a colorless monoclinic crystal, has a density of 2.10 g / cm 3, a melting point of 726 ° C., and decomposes into Li ₂ O and CO ₂ at 1500 ° C. or higher. Solubility is 1.54g (0 ℃), 0.72g (100 ℃) / 100g water, insoluble in ethanol.

The lithium carbonate contains 99% by weight of Li ₂ CO ₃ , 0.1% by weight of SO ₄ , 0.01% by weight of Cl, and a small amount of K, Mg, B, and Fe, and has a size of 25 μm.

On the other hand, the aluminum hydroxide is an aluminate-based fastener, and is naturally calculated from gibbsite, diaspore, and the like.

For reference, the Gibbs seats OH is coordinated to six AI ^{3 +} a monoclinic crystal system crystals are obtained with a layer structure, i.e. gelatin-shaped precipitated Applying the aqueous ammonia to the aluminum salt solution sharing a single edge of the octahedron. In the present invention, a specific gravity of 1.48, a pH of 13 ± 1, and a brown liquid type fastener were used.

In addition, the types of wall materials used in the present invention are shown in Table 1 below.

Type of wall material acryl
emulsion
(One) acryl
emulsion
(2) acryl
emulsion
(3) acryl
emulsion
(4) acryl
emulsion
(5) Sodium silicate
(Na ₂ SiO ₃ ) Remarks Solids (wt%) 40.0 45.0 40.0 22.0 42.0 - Viscosity (cps) 50 500 50 20 20 - pH 3.0 8.0 8.0 2.0 2.0 - Vitrification Temperature (Tg) (° C) -5 -40 0 -10 15 - Where to buy APEC APEC APEC APEC APEC Y.K company Remarks Pure Acryl
Emulsion Styrene-acryl
Emulsion Pure Acryl
Emulsion Pure Acryl
Emulsion Pure Acryl
Emulsion -

That is, the wall materials illustrated in Table 1 include acrylic emulsion (1), acrylic emulsion (2), acrylic emulsion (3), acrylic emulsion (4), acrylic emulsion (5) and sodium silicate, respectively. The characteristic fields of, namely solid content, viscosity, pH, vitrification temperature and the place of purchase are indicated.

On the other hand, the mixing ratio of the core material 13 and the wall material 15 constituting the microcapsule admixture 10 of the present invention can be configured in the following form.

First, as the first embodiment of the blending ratio, the accelerator and the fastener are used together as the core material 13, and the second embodiment of the blending ratio is the case where only the accelerator is used as the core material 13.

That is, in the first embodiment of the blending ratio, the microcapsule admixture 10 of the present invention is 30-50% by weight of lithium carbonate as an accelerator and 10-30% by weight of aluminum oxide as a fastener as the core material 13, respectively. The wall material 15 includes 5-30% by weight of an acrylic emulsion and 5-30% by weight of sodium silicate, respectively.

In the second embodiment of the blending ratio, the microcapsule admixture 10 of the present invention contains 30-60 wt% of lithium carbonate as the core material 13, and the wall material 15 contains 20-50 wt% of an acrylic emulsion. %, 20-50% by weight of sodium silicate, respectively.

An example of the mixing ratio between the core material 13 and the wall material 15 is shown in Table 2 below.

Example of mixing ratio between core material and wall material division lithium
Carbonate
( Li ₂ CO ₃ ) A quick payment
( Al ₂ OH ₃ ) acryl
emulsion
(One) acryl
emulsion
(2) acryl
emulsion
(3) acryl
emulsion
(4) acryl
emulsion
(5) sodium
silicate
( Na ₂ SiO ₃ ) One 47 23 20 - - - 2 50 25 15 - - - 3 52 28 10 - - - 4 55 30 5 - - - 5 52 28 - 10 - - 6 47 23 - - 20 - 7 50 25 - - 15 - 8 52 28 - - 10 - 9 55 30 - - 5 - 10 47 23 - - - 20 11 50 25 - - - 15 12 52 28 - - - 10 13 55 30 - - - 5 14 61 29 15 37 14 39 16 40 20 15 15

In the examples of the compounding ratios illustrated in Table 2, the compounding ratios of items 14 and 15 in the section are cases where only lithium carbonate, which is an accelerator, is used as a core material.

It will be described a method for producing a microcapsule admixture of the present invention having a compounding ratio as described above.

2 is a diagram illustrating the structure of a fluidized bed coater for preparing a microcapsule admixture of the present invention.

The fluidized bed coater 30 shown in the drawing is one of the devices generally used when manufacturing microcapsule, and includes a coater 33 having a space formed therein for receiving the seed core material and coating the wall material. And a liquid tank 35 for supplying wall material into the coater 33, an injection nozzle 36 provided on the bottom bottom surface 33a of the coater 33, and the coater 33. A fan 31 connected to one side of the fan 31 to supply air to the coater 33 side, and a dust collector 32 and the coater 33 installed on a passage through which the coater 33 and the fan 31 are connected; And an air control unit 34 connected to one side of the bottom of the head).

Referring to the method and process for producing the microcapsule admixture of the present invention using the fluidized bed coater 30 of the above-described structure is as follows.

First, after inserting the seed core material 13 into the inside of the coater 33, the seed core material 13 injected into the coater 33 is fluidized while operating the fan 31 to circulate air.

Then, the coating is performed by spraying a liquid prepared in the liquid tank 35, that is, a water-soluble polymer (acrylic resin) or sodium silicate, which is a wall material 15.

When the wall material 15 is coated around the outer surface of the seed core material 13 to form a capsule, drying is performed for a predetermined time, and when the drying is completed, the microcapsule admixture 10 is finished in the coater 3. Are manufactured.

On the other hand, in the manufacturing process of the microcapsule admixture, the type and compounding ratio of the core material 13 and the wall material 15 may be carried out according to the conditions exemplified above.

The microcapsule admixture 10 of the present invention is manufactured through the above-described process, and may vary the characteristics of the microcapsule admixture when the mixing structure of the core material and the wall material is different.

The microcapsule admixture of the present invention prepared by the above process was applied to the concrete mixture, and the experiment was carried out to determine the state of the condensation time variation of the concrete, which will be described below.

First, in order to clarify the effect of using the microcapsule admixture of the present invention, after mixing 500 g of cement, 25 g of the microcapsule admixture of the present invention, and 150 g of water, the condensation time was measured. It was divided into a plurality of groups, which are shown in Tables 3 to 6 below.

(Group 1) division lithium
Carbonate
( Li ₂ CO ₃ ) A quick payment
( Al ₂ OH ₃ ) acryl
emulsion
(One) First closing Remarks accelerant 90 6 minutes 22 minutes General admixture A quick payment 90 5 minutes 5 minutes General admixture One 47 23 20 9 minutes 18 minutes Microcapsule Admixtures 2 50 25 15 5 minutes 17 minutes Microcapsule Admixtures 3 52 28 10 6 minutes 17 minutes Microcapsule Admixtures 4 55 30 5 5 minutes 8 minutes Microcapsule Admixtures

Table 3 shows the case of using the acrylic emulsion (1) as a wall material, compared with the case of the general admixture and the microcapsule admixture for construction materials of the present invention.

(Group 2) division lithium
Carbonate
( Li ₂ CO ₃ ) A quick payment
( Al ₂ OH ₃ ) acryl
emulsion
(2) acryl
emulsion
(3) First closing Remarks 5 52 28 10 - Microcapsule Admixtures 6 47 23 - 20 16 25 Microcapsule Admixtures 7 50 25 - 15 10 21 Microcapsule Admixtures 8 52 28 - 10 4 11 Microcapsule Admixtures 9 55 30 - 5 4 6 Microcapsule Admixtures

Table 4 shows the case where an acrylic emulsion (2) and an acrylic emulsion (3) are used as wall materials.

(Group 3) division lithium
Carbonate
( Li ₂ CO ₃ ) A quick payment
( Al ₂ OH ₃ ) acryl
emulsion
(4) First closing Remarks 10 47 23 20 7 minutes 14 minutes Microcapsule Admixtures 11 50 25 15 5 minutes 12 minutes Microcapsule Admixtures 12 52 28 10 4 minutes 16 minutes Microcapsule Admixtures 13 55 30 5 7 minutes 17 minutes Microcapsule Admixtures

Table 5 shows the case where the acrylic emulsion 4 is used as the wall material.

(Group 4) division lithium
Carbonate
( Li ₂ CO ₃ ) A quick payment
( Al ₂ OH ₃ ) acryl
emulsion
(3) acryl
emulsion
(5) sodiumsilicate First closing Remarks 14 61 29 40 122 Microcapsule Admixtures 15 37 14 39 27 85 Microcapsule Admixtures 16 40 20 15 15 19 62 Microcapsule Admixtures

 Table 6 shows a case where an acrylic emulsion (3) and an acrylic emulsion (5) are used as wall materials.

Through the above experimental results (Groups 1 to 4), when the microcapsule admixture 10 of the present invention is added to form concrete, the initial or final time of the concrete is generally increased compared with the case of using the general admixture. It can be seen.

In this way, the delay in the initial setting time of the concrete can prevent the rapid setting of the fastening agent can eliminate the clogging phenomenon of the shotcrete equipment. This ensures the construction time for the laborer can be constructed.

In addition, in the past, because the rapid curing agent is set quickly, additional cost is added to the shotcrete equipment to be added to the additional cost incurred, the construction is significantly reduced, but using the microcapsule admixture of the present invention solves this problem It becomes possible.

In addition, the fastener is difficult to handle because it is harmful to the human body, the microcapsule admixture of the present invention is safe because the microcapsules protect the fastener and thereby easy to handle.

10: microcapsules admixture 13: core substance
15: wall material
30: fluidized bed coater 31: Fan
33: Coater 35: liquid tank
34: air control unit 36: injection nozzle

Claims (7)

A microcapsule admixture comprising a core material and a wall material coated on an outer circumferential surface of the core material,
The core material includes lithium carbonate as an accelerator and aluminum hydroxide as a accelerator,
The wall material is a microcapsule admixture comprising an acrylic emulsion or sodium silicate that is a water-soluble polymer. The method according to claim 1,
The microcapsule admixture is 30-60% by weight of lithium carbonate as a core material, 20-50% by weight of an acrylic emulsion and 20-50% by weight of sodium silicate as the wall material, respectively. The method according to claim 1,
The microcapsule admixture contains 30-50% by weight of lithium carbonate as a core material and 10-30% by weight of aluminum oxide as a fastener, 5-30% by weight of an acrylic emulsion as a wall material, and 5-sodium silicate as a material. Microcapsule admixtures each containing 30% by weight. Method for producing a microcapsule admixture using a fluidized bed coater,
Injecting a core material into the coater of the fluidized bed coater;
Fluidizing the core material in a coater;
Spraying a wall material and coating the outer circumferential surface of the core material;
Drying the coated core material,
The core material is lithium carbonate as an accelerator and aluminum hydroxide as a accelerator, and the wall material is an acrylic emulsion or sodium silicate, which is a water-soluble polymer. delete The method of claim 4,
30-60% by weight of lithium carbonate as the core material, 20-50% by weight of acrylic emulsion and 20-50% by weight of sodium silicate as the wall material, respectively. The method of claim 4,
The core material includes 30-50% by weight of lithium carbonate and 10-30% by weight of aluminum hydroxide, and the micromaterials each contain 5-30% by weight of acrylic emulsion and 5-30% by weight of sodium silicate. Capsule admixture manufacturing method.

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