KR102171525B1 - Composition having high elasticity and antimicrobial property for aspartic joint filler - Google Patents

Abstract

The present invention relates to a composition for an aspartic joint material having high elasticity and antibacterial properties, wherein the composition for the joint material includes a subject comprising an aliphatic isocyanate; And a curing agent including a plurality of aspartic resins having different weight average molecular weights; including, the main material and the curing agent may be mixed in a volume ratio of 1:1, and thus workability without using expensive two-component spray equipment It provides a technology for manufacturing a joint material with excellent workability.

Description

Composition for aspartic joint materials having high elasticity and antibacterial properties {COMPOSITION HAVING HIGH ELASTICITY AND ANTIMICROBIAL PROPERTY FOR ASPARTIC JOINT FILLER}

The present invention relates to a composition for joint materials.

In general, a joint filler refers to a material that is applied to a space having a certain interval to fill the space. For example, the joint material may be used for filling a joint between a tile and a tile, that is, a joint. In this regard, Korean Patent Publication No. 10-1876885 discloses a composition for a joint material.

On the other hand, the coating material that urea bonds by the reaction of the -NCO- group of the isocyanate compound and the -NH- group of the amine compound is called a polyurea coating material, which reacts very quickly, so that a coating film can be formed within a few seconds without a catalyst.

However, in order to apply such excellent constructability and drying properties to the site, expensive two-component special spray equipment had to be used. Therefore, in order to compensate for this, the situation is being constructed using polyaspartic resin, which is a polyurea product capable of manual work.

However, the existing tile joints are constructed of white concrete or white epoxy type products, which are inexpensive, but are very hard, so the probability of cracking easily even from vibration and impact of concrete is very high, and the curing time is very high. It takes a long time and takes more than two days to cure in sub-zero winter, which is a concern about enormous economic losses due to the extension of the construction period.

In addition, since the joint material fills the grooves between the tiles, it should look gorgeous in appearance.Since the joint material is filled in the corners of the bathroom, bathtub, or sink where there is a lot of water or moisture, the propagation of bacteria is very fast in summer, so it is shown in Fig. As described above, there is a concern that the appearance of the joint material looks messy as if the color has changed due to mold. Therefore, the development of a new joint material that improves the conventional problems is urgent.

An object of the present invention is to solve the above-described problems, and to provide a technique for manufacturing a joint material having excellent workability and workability without using an expensive two-component spray equipment.

In addition, another object of the present invention is to provide a technique for rapidly curing and manufacturing a joint material having excellent elasticity.

In addition, the present invention has another object to provide a technology for maintaining the aesthetics of the joint material by inhibiting the propagation of bacteria.

The problem to be solved by the present invention is not limited to the above-described problem, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description.

In order to achieve this object, as an embodiment of the present invention, a composition for a joint material having high elasticity and antibacterial properties comprises: a subject comprising an aliphatic isocyanate; And a curing agent including a plurality of aspartic resins having different weight average molecular weights, and the main material and the curing agent may be mixed in a volume ratio of 1:1.

In addition, the subject may further include an NCO content adjusting agent mixed with the aliphatic isocyanate to adjust the NCO weight% of the subject.

In addition, the aliphatic isocyanate is 78 to 82% by weight, and the NCO content control agent may be provided at 18 to 22% by weight.

In addition, the NCO content control agent is provided with propylene carbonate, and due to the mixture of the propylene carbonate and the aliphatic isocyanate, the NCO% by weight of the subject may be adjusted to 19 to 20% by weight.

In addition, the plurality of aspartic resins are 72 to 77.5% by weight of aspartic resins having a weight average molecular weight of 3000 g/mol; And 10 to 11% by weight of an aspartic resin having a weight average molecular weight of 5000g/mol.

In addition, the curing agent is 3 to 5% by weight of a joint material color retaining agent that prevents the color of the joint material from being deteriorated; 0.5 to 1% by weight of antifoam; And 9 to 11% by weight of a pearl pigment; may further include.

The means for solving the above-described problems are merely exemplary and should not be construed as limiting the present invention. In addition to the above-described exemplary embodiments, there may be additional embodiments described in the drawings and detailed description of the invention.

As described above, according to an embodiment of the present invention, the following effects are obtained.

First, when the aliphatic isocyanate of the subject and the aspartic resin of the curing agent are mixed, the joint material is quickly cured, so that the workability is excellent, so there is an effect of excellent workability without using an expensive two-component spray equipment.

Second, as the base material is prepared by mixing the aliphatic isocyanate and the NCO content control agent together, the content of the aliphatic isocyanate decreases as the NCO content control agent is added in the base material, and as a result, the weight% of NCO contained in the aliphatic isocyanate decreases. When the curing agent is mixed, the reactivity is slowed to a certain level, so that the adhesion to the base surface is increased, and the elongation rate is improved. That is, since the composition for a joint material according to an embodiment has high elasticity, cracks do not occur even with slight impacts, and there is an advantage of excellent durability.

Third, the joint material color retaining agent contained in the curing agent suppresses the propagation of bacteria such as mold, so that the color of the joint material is not altered by bacteria, so that the aesthetics of the joint material can be maintained the same as that of the initial installation, which has a very excellent effect in appearance.

The effects of the present invention are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a photograph of a mold propagating on a conventional white joint material.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, but technical parts that are already well-known will be omitted or compressed for conciseness of description.

It should be noted that references to "one" or "one" embodiment of the present invention in this specification are not necessarily to the same embodiment, and they mean at least one.

In the following embodiments, terms such as first and second are not used in a limiting meaning, but are used for the purpose of distinguishing one component from another component.

In the following examples, a singular expression includes a plural expression unless the context clearly indicates otherwise.

In the following embodiments, terms such as include or have means that the features or elements described in the specification are present, and do not preclude the possibility of adding one or more other features or elements.

In the following embodiments, when a part such as a film, a region, or a component is on or on another part, not only the case directly above the other part, but also another film, region, component, etc. This includes cases where there is.

In the following examples, the term "combination(s) thereof" included in the expression of the Makushi format refers to one or more mixtures or combinations selected from the group consisting of components described in the expression of the Makushi format. , It means to include at least one selected from the group consisting of the above components.

The term "about" used in front of a numerical value throughout the specification is used at or close to the numerical value when manufacturing and material tolerances specific to the stated meaning are presented, and are accurate to aid the understanding of the present application Absolute numbers are used to prevent unfair use of the stated disclosure by unscrupulous infringers.

In the present specification, NCO% by weight represents the content of the isocyanate group (-NCO-) contained in the aliphatic isocyanate compound as a weight percentage.

The composition for a joint material according to an embodiment of the present invention may include a main material and a curing agent. Here, the subject may include an aliphatic isocyanate and an NCO content modifier.

In general, aromatic isocyanates have a benzene ring in molecular structure, so there are many reactive groups that can react, so the reaction is relatively faster than aliphatic isocyanates, and the aliphatic type has a linear structure in the molecular structure. Because of this, urea bonding reactivity is relatively slow.

In order to enable the manual operation of the joint material without the use of expensive two-component special spraying equipment, in one embodiment, the isocyanate included in the subject is applied as an aliphatic isocyanate, so that the reactivity can be slowed compared to the existing polyurea-type joint material.

In addition, the aliphatic isocyanate may be applied to at least one selected from the group consisting of hexamethylene diisocyanate (HDI), hexamethylene triisocyanate (HDT), and isophorone diisocyanate (IPDI), but is not limited thereto.

In addition, examples of commercially available aliphatic isocyanates in one embodiment may include Desmodur N-3600 (Bayer), Desmodur N-3300 (Bayer), but are not limited thereto.

The aliphatic isocyanate according to an embodiment may be applied in an amount of 78 to 82% by weight based on 100% by weight, which is the total weight of the subject. As a specific example, the content of the aliphatic isocyanate may be about 78% by weight, about 79% by weight, about 80% by weight, about 81% by weight, or about 82% by weight. In addition, the content of the aliphatic isocyanate may range from one or more of the above values to one or less of the above values.

For example, the aliphatic isocyanate content ranges from about 78% to about 80%, about 79% to about 81%, about 80% to about 82%, or about 78% to about 82% by weight. It can be provided in a range. The aliphatic isocyanate according to an embodiment can maintain the hardenability and elasticity of the joint material at an excellent level within the above range.

If the content of the aliphatic isocyanate is less than 78% by weight, the NCO% by weight of the main material decreases, resulting in a longer reaction time, and it takes a long time for the joint material to harden, so the total construction period may be prolonged, and the content of aliphatic isocyanate is reduced. If it exceeds 82% by weight, as the NCO% by weight of the main material increases, the elasticity of the joint material decreases, impact resistance decreases, and the probability of occurrence of cracks in the joint material increases.Therefore, the content of aliphatic isocyanate is preferably applied within the above-described range. Do.

In one embodiment, the NCO content modifier may be mixed with an aliphatic isocyanate present in the subject to adjust the NCO weight% (ie, the content of isocyanate groups) of the subject. In addition, the NCO content modifier can be applied with propylene carbonate.

Examples of commercially available NCO content modifiers in one embodiment may include propylene carbonate (Huntsman), C-16 (Jiangsu runtai), but are not limited thereto.

The NCO content control agent according to an embodiment may be applied in an amount of 18 to 22% by weight. As a specific example, the content of the NCO content control agent may be provided in about 18% by weight, about 19% by weight, about 20% by weight, about 21% by weight, or about 22% by weight. In addition, the NCO content control agent may range from one or more of the above values to one or less of the above values.

For example, the content of the NCO content modifier ranges from about 18% to about 20%, from about 19% to about 21%, from about 20% to about 22% or from about 18% to about 22% by weight. It can be provided in the range of. The NCO content control agent according to an embodiment may maintain the viscosity, curability and elasticity of the joint material at an excellent level within the above range.

If the content of the NCO content control agent is less than 18% by weight, there is a problem that the NCO content of the main material exceeds 20% by weight and the impact resistance of the joint material decreases, causing cracks, and the content of the NCO content control agent is 22% by weight. If it exceeds %, the viscosity of the joint material is too low, so that the workability of the bathroom floor or tile wall is deteriorated, and the amount of the NCO content control agent is preferably applied within the above-described range.

In one embodiment, since the base material is prepared by mixing propylene carbonate and aliphatic isocyanate, the NCO wt% of the base material including propylene carbonate and aliphatic isocyanate may be adjusted to 19-20 wt%. In other words, the content of propylene carbonate and aliphatic isocyanate can be adjusted so that the NCO% by weight of the main material is 19-20% by weight.

In one embodiment, when the total weight of the subject is 100% by weight, the NCO% by weight of the subject may vary according to the content of the aliphatic isocyanate constituting the subject. For example, if the total weight of the subject is 100% by weight and the aliphatic isocyanate constituting the subject is 100% by weight, assuming that the NCO% by weight of the subject is 23.5% by weight, the aliphatic isocyanate in the subject is 80% by weight. And, when the propylene carbonate is 20% by weight, the content of the aliphatic isocyanate is reduced based on the total weight of the main material, so that the NCO% by weight of the main material is also reduced compared to when the aliphatic isocyanate is 100% by weight. That is, as the content of the aliphatic isocyanate is relatively reduced as the amount of the NCO content control agent is added in the subject matter, the NCO weight% of the subject matter is also decreased.

In one embodiment, as propylene carbonate is used as an NCO content control agent to lower the viscosity and NCO% by weight of the subject, the elasticity of the joint material is secured at an excellent level by lowering the NCO% by weight of the subject, and the viscosity of the subject at a level that is easy for work. Since it can be lowered, there is an effect of further improving workability.

In one embodiment, the curing agent may include a plurality of aspartic resins having different weight average molecular weights, a joint color retaining agent, an antifoaming agent, and a pearl pigment. Here, the plurality of aspartic resins are reactive resins having an amine group, and in one embodiment may be applied as aspartic amines. The amine group in the aspartic resin may be bonded by reacting with the isocyanate group contained in the aliphatic isocyanate.

In addition, a plurality of aspartic resins are aspartic resins having a weight average molecular weight of 3000 g/mol (hereinafter referred to as'first aspartic resin') and aspartic resins having a weight average molecular weight of 5000 g/mol (hereinafter, referred to as'second It can be applied as'aspartic resin'). The first aspartic resin has a small weight average molecular weight and is more reactive than the second aspartic resin, and the second aspartic resin has a large weight average molecular weight and has a relatively slow reactivity compared to the first aspartic resin. Accordingly, in one embodiment, 72 to 77.5% by weight of the first aspartic resin may be used, and 10 to 11% by weight of the second aspartic resin may be used.

Examples of the first aspartic resin commercially available in one embodiment may include Desmophen NH-1420 (Covestro), Teraspartic 277 (Pflaumer), but are not limited thereto.

The first aspartic resin according to an embodiment may be applied in an amount of 72 to 77.5% by weight, based on 100% by weight of the total weight of the curing agent. As a specific example, the content of the first aspartic resin may be provided in about 72% by weight, about 73% by weight, about 74% by weight, about 75% by weight, about 76% by weight, about 77% by weight, or about 77.5% by weight. . In addition, the content of the first aspartic resin may range from one or more of the above values to one or less of the above values.

For example, the content of the first aspartic resin is about 72% to about 74%, about 73% to about 75%, about 74% to about 76%, about 75% to about 77% by weight. %, about 76% by weight to about 77.5% by weight, or about 72% by weight to about 77.5% by weight. The first aspartic resin according to an embodiment may adjust the reaction rate of the joint material to an appropriate level within the above range.

If the content of the first aspartic resin is less than 72% by weight, the reaction rate becomes too slow when mixed with the aliphatic isocyanate of the main material, and the time for the joint material coating to cure may take a very long time, which may delay the construction period. When the content of the resin exceeds 77.5% by weight, the reaction speed becomes too fast when mixing with the main material, which shortens the pot life for workers to use the aspartic joint material. It may be discarded, and there is a fear that the adhesion to the substrate may be poor.

Meanwhile, examples of the second aspartic resin commercially available in one embodiment may include Desmophen NH-1520 (Covestro), Teraspartic 292 (Pflaumer), but are not limited thereto.

The second aspartic resin according to an exemplary embodiment may be applied in an amount of 10 to 11% by weight, based on 100% by weight of the total weight of the curing agent. As a specific example, the content of the second aspartic resin may be provided in about 10% by weight or about 11% by weight. In addition, the content of the second aspartic resin may range from one or more of the above values to one or less of the above values.

If the content of the second aspartic resin is less than 10% by weight, the hardness of the joint material coating film is too high, resulting in poor adhesion to the substrate, the probability of occurrence of cracks in the coating film is very high, and the content of the second aspartic resin is 11 If the weight% is exceeded, the hardness of the joint material coating film becomes too weak, and when the joint material is pressed with a fingernail, the nail marks remain on the joint material and the probability of being easily separated or peeled off from the area where the joint material is installed is very high. The content of is preferably applied within the above-described range.

In one embodiment, the joint material color retaining agent contains an antibacterial component to prevent the color of the joint material from being deteriorated due to the growth of mold or bacteria. In other words, the joint material color retaining agent means an antibacterial agent containing an antibacterial component. The joint material color retaining agent can prevent the color of the joint material from being altered by mold or bacteria by inhibiting the growth of mold and bacteria on the surface of the joint material.

Specifically, the joint material color retention agent may be prepared in a liquid form by mixing a liquid diluent with an inorganic antimicrobial powder. In addition, the inorganic antimicrobial powder is made by substituting silver, zinc, or copper, which are metal ions that have an antibacterial effect on inorganic substances such as zeolite, calcium phosphate, zirconium phosphate or silica gel.

The inorganic antibacterial agent contained in the joint material color retention agent has higher human stability compared to the organic antibacterial material, does not show resistant bacteria, and has the advantage of almost semi-permanent antibacterial duration. In particular, since the zeolite-based inorganic antibacterial agent has no discoloration problem compared to other antibacterial agents, has high antibacterial activity, and has low particle hardness, it is more preferable to apply the zeolite-based inorganic antibacterial agent powder in the joint material color retaining agent.

In addition, as a diluent that is mixed with the inorganic antibacterial powder in the joint material color retention agent, water, ethanol, glycol, or Propylene glycol types can be applied. Since the joint material color retaining agent according to an embodiment is manufactured in a liquid form, based on the total weight of the joint material color retaining agent 100% by weight, 50% by weight of the solid content of the inorganic antibacterial agent powder and 50% by weight of the diluent may be used.

In one embodiment, it is preferable to use the inorganic antibacterial agent in a liquid form by diluting the inorganic antibacterial agent instead of using the inorganic antimicrobial agent powder as it is in the curing agent in order to ensure the transparency of the joint material and sufficiently express the sparkling effect by the pearl pigment. If the inorganic antimicrobial powder is not mixed with a separate diluent and is added to the curing agent in the form of a powder, the transparency of the composition for the joint material is deteriorated, and the sparkling effect by the pearl pigment is deteriorated, and the appearance may not be beautiful.

In addition, in one embodiment, based on 100% by weight of the total weight of the joint material color retention agent, when the solid content of the inorganic antimicrobial agent powder is less than 50% by weight, the content of the diluent is relatively high, which affects the reactivity of the joint material, thereby reducing the drying time. It is very long, and there is a risk that the antibacterial activity may decrease, and when the solid content exceeds 50% by weight, the antibacterial activity increases, whereas the transparency of the composition for joint materials decreases and the sparkling effect by the pearl pigment decreases, making it difficult to look beautiful. The ash color retention agent is preferably composed of 50% by weight of the inorganic antimicrobial powder solid and 50% by weight of the diluent.

In one embodiment, examples of the commercially available joint color retaining agent may be Thiocide TX-2000 (Phoenix Corporation), Acticide ICB2 (THOR Corporation), etc., but is not limited thereto.

The joint material color retention agent according to an embodiment may be applied in an amount of 3 to 5% by weight. As a specific example, the content of the joint material color retention agent may be provided in about 3% by weight, about 4% by weight, or about 5% by weight. In addition, the joint material color retention agent may range from one or more of the above values to one or less of the above values.

For example, the content range of the joint material color retention agent may be provided in the range of about 3% by weight to about 4% by weight, about 4% by weight to about 5% by weight, or about 3% by weight to about 5% by weight. The joint material color retention agent according to an embodiment may maintain the antibacterial properties and aesthetics of the joint material at an excellent level within the above range.

If the content of the joint material color retaining agent is less than 3% by weight, it is difficult to control the growth of mold or bacteria, so there is a risk that mold may grow rapidly on the surface of the joint material in a high temperature and high humidity environment. When the content of is more than 5% by weight, there are a large amount of molecules that do not react in the joint material coating film, so that the curing time appears very slowly, thereby reducing workability.

In one embodiment, the antifoaming agent may improve the appearance and wear resistance of the coating film by removing air bubbles on the surface of the aspartic joint material coating film. Examples of commercially available antifoaming agents in one embodiment may be BYK-A500 (BYK), BYK-141 (BYK), but are not limited thereto.

The antifoaming agent according to an embodiment may be included in an amount of 0.5 to 1% by weight in the curing agent. As a specific example, the content of the antifoaming agent may be provided in about 0.5% by weight or about 1% by weight. If the content of the antifoaming agent is less than 0.5% by weight, it is difficult to remove the air bubbles in the solution for the joint material.Therefore, the appearance of the joint material is poor due to the occurrence of a large number of bubble marks. There is a problem that the added antifoaming agent rises to the surface of the joint material coating, resulting in poor interlayer adhesion.

In one embodiment, the pearl (pearl) pigment is well known in the art as a pearlescent pigment, and may be introduced into a curing agent to give a splendid appearance to the joint material.

Examples of commercially available pearl pigments in one embodiment may include Regina Pearl (COCM), EG2 (ARDEX), etc., but are not limited thereto.

The pearl pigment according to an embodiment may be applied in an amount of 9 to 11% by weight. As a specific example, the content of the pearl pigment may be provided in about 9% by weight, about 10% by weight, or about 11% by weight. In addition, the pearl pigment may range from one or more of the above values to one or less of the above values.

For example, the content range of the pearl pigment may be provided in the range of about 9% to about 10% by weight, about 10% to about 11% by weight, or about 9% to about 11% by weight. The pearl pigment according to an embodiment can maintain the viscosity of the curing agent mixture and the hiding power of the joint material coating film at an excellent level within the above range.

If the content of the pearl pigment representing the color of the aspartic joint material coating film is less than 9% by weight, the hiding power of the joint material coating film on the base surface is poor, so that the small surface is visible.If the pearl pigment exceeds 11% by weight, the curing agent itself There is a fear that a major problem may occur in workability due to an increase in the viscosity of the mixture.

On the other hand, in one embodiment, the main material and the curing agent of the composition for joint materials are mixed in a volume ratio of 1:1 and reacted with each other and cured to form a joint material coating film.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only one example for aiding understanding of the present invention, so the scope of the present invention is not limited or limited thereto.

Preparation of Examples 1 to 9 and Comparative Examples 1 to 13

Examples 1 to 3 and Comparative Examples 1 to 4 were prepared as the subject of the joint material composition and a curing agent as shown in Table 1, and Examples 4 to 8 and Comparative Examples 5 to 8 were the subject of the joint material composition as shown in Table 2 below. And a curing agent were prepared, and in Example 9 and Comparative Examples 9 to 13, a subject and a curing agent of the joint material composition were prepared as shown in Table 3 below. In the joint material color retention agent of Table 3, the solid content is a zeolite-based inorganic antimicrobial powder and the diluent is glycol (Glycol). In Tables 1 to 3, the unit of the content of the main material and the hardener is grams. Each subject and curing agent were added to the reaction tank and sufficiently stirred at 1,000 to 2,000 rpm for 30 minutes to 1 hour.

Method for evaluating the properties of the joint material coating

After mixing the subject and the curing agent of each Example and Comparative Example in a 1:1 volume ratio (unit is ml) and making a coating film with a thickness of 1 mm on a polyethylene plate, curing for 7 days in a thermo-hygrostat with a temperature of 25°C and a relative humidity of 60%, Physical properties were measured according to the method of, and the results are shown in Tables 4 and 5 below.

1. Pot life

Pot life refers to the time during which two or more components are not gelled or hardened when the main material and the hardener are mixed and maintain proper fluidity. The pot life of the composition for joint materials was measured by observing the change in viscosity with time at 25° C. using a Brookfield HAT Viscometer.

2. Hardness

The hardness was measured using a Shore D hardness tester according to ASTM D2240.

3. Impact resistance

According to KSM ISO 6272-1, a 1 kg weight was dropped from a 50 cm high fixture to visually check whether cracks occurred in each coating specimen, and if no cracks occurred, it was evaluated as good and if cracks occurred, it was evaluated as bad. .

4. Elongation rate

According to KS F 4922, the elongation rate (%) of the coating film was measured with a universal tensile tester.

5. Antibacterial

Each coating specimen was placed in an enclosed space and left for 4 weeks under conditions of a temperature of 25°C and a relative humidity of 80%, and then it was confirmed whether mold exists on the surface of the coating film. If it was confirmed that mold had grown on the surface of the coating film, it was evaluated as defective, and if not, it was evaluated as good.

6. Curing time

The base material and the curing agent of each Example and Comparative Example were mixed in a volume ratio of 1:1 (unit is ml), and a coating film was made to a thickness of 1 mm on a polyethylene plate, and the time required for curing was measured while curing at 25°C.

7. Viscosity

The viscosity of the curing agent of each Example and Comparative Example was measured with a rotation viscometer (Brookfield HAT Viscometer) at 25 ℃. When the measured viscosity was 1000 cps or less, the viscosity was good, and when it exceeded 1000 cps, the viscosity was evaluated as poor.

8. Hiding power

After the coating films of each of the Examples and Comparative Examples were completely cured on the polyethylene plate, it was observed whether or not the polyethylene plate as the base material was visible to the naked eye. If the surface was visible with the naked eye, the hiding power was evaluated as poor, and if not, it was evaluated as good.

9. Adhesion

According to KSM ISO 2409, 100 grooves were drawn at 1 mm x 1 mm intervals on the coating specimen with a constant force, attached with a glass tape, and after a certain period of time, the glass tape was removed and the number of adhered to the glass tape was measured. If the number of adhered to the glass tape was 10 or less, the adhesion was excellent, and if it exceeded 10, the adhesion was evaluated as poor.

10. Appearance

After the coating films of each of the Examples and Comparative Examples were completely cured on a polyethylene plate, they were observed with the naked eye to confirm whether air bubbles were present on the surface of the coating film. If there was a bubble mark on the surface of the coating film, the appearance was evaluated as poor, and if not, it was evaluated as good.

11. Beauty

After the coating films of each of the Examples and Comparative Examples were completely cured on the polyethylene plate, they were observed with the naked eye to confirm the presence or absence of glitter of pearl particles included in the coating film. If the glitter of pearl particles was well observed with the naked eye, the appearance was excellent, and if not well observed, it was evaluated as poor.

As shown in Table 4, Examples 1 to 9 according to the present invention have overall excellent physical properties in terms of pot life, hardness, impact resistance, elongation, antibacterial resistance, curing time, viscosity, hiding power, adhesion, appearance, and aesthetics. It can be confirmed that there is.

Looking at the results of Comparative Examples 1 to 4 in Table 5, it can be seen that in Comparative Examples 1 to 2, since the NCO wt% exceeds 20 wt%, the elongation decreases and cracks occur, resulting in poor impact resistance, and Comparative Examples 3 to 4 Since the NCO% by weight is less than 19% by weight, it can be confirmed that the elongation and impact resistance are good, but the curing time is long and the workability is poor.

In addition, through the results of Comparative Examples 5 to 8, it can be seen that when the content of each component of the main material and the curing agent included in the composition for joint materials exceeds or is less than the range of the input amount for each component, the basic physical properties of the joint material are deteriorated.

In addition, through the results of Comparative Examples 9 to 13, it can be confirmed that even if a liquid antibacterial agent is applied as a joint material color retaining agent, the antibacterial activity and aesthetics are greatly affected depending on the solid content of the antibacterial agent and the content of the diluent.

As described above, the composition for a joint material according to an embodiment is excellent in workability by rapidly curing the joint material when the aliphatic isocyanate of the main material and the aspartic resin of the curing agent are mixed, so there is no need to use expensive two-component spray equipment. There is an effect of excellent workability.

In addition, as the base material is prepared by mixing the aliphatic isocyanate and the NCO content control agent together, the content of the aliphatic isocyanate decreases as the NCO content control agent is added in the base material, and as a result, the weight% of NCO contained in the aliphatic isocyanate decreases. When the curing agent is mixed, the reactivity is slowed to a certain level, so that the adhesion to the base surface is increased, and the elongation rate is improved. That is, since the composition for a joint material according to an embodiment has high elasticity, cracks do not occur even with slight impacts, and there is an advantage of excellent durability.

In the past, when trying to obtain high elastic properties to prevent cracking of the aspartic joint material, the NCO wt% of isocyanate was used as the undiluted solution, but this is a quick-drying type and good workability because the reactivity is very fast due to high NCO wt%. There was a problem that the adhesion to the base surface was poor due to the increase in the hardness of the joint material, and the possibility of separation of the coating film was very high because cracks easily occurred even with slight vibration and impact of the building.

In general, the higher the weight% of NCO, the more reactive isocyanate groups (-NCO-) are distributed in the molecule.Therefore, since there are many reactive groups to bind to the amine group (-NH-), the crosslinking strength increases and the tensile strength increases. Gina elongation (elastic modulus) is relatively low, on the contrary, when NCO weight% is lowered, less isocyanate groups that can react are distributed and there are fewer reactive groups to be bonded, so the degree of crosslinking is relatively low, resulting in lower tensile strength and higher elongation (elastic modulus). .

In one embodiment, propylene carbonate was added to an aliphatic isocyanate having an isocyanate group to prepare a subject that influences elasticity. That is, by applying an elastic force to the aspartic joint material itself, cracks are prevented.

Typically, since the joint material is applied a lot to indoor spaces with high humidity, such as the floor or wall of a toilet or bathroom, it requires a high elasticity compared to a surface finishing material or a composition for other purposes. Because, when the concrete wall in the room absorbs or releases moisture, vibrations occur finely, so if the elastic force of the joint member is weak, cracks can easily occur in the joint member. Therefore, the joint material requires a relatively high elasticity than the finishing material applied to the surface, and the composition for the joint material according to an embodiment has excellent elasticity, so that it does not easily crack even when vibration occurs around the joint material, so the durability of the joint material is excellent. There is.

In addition, since the joint material color retaining agent contained in the curing agent inhibits the propagation of bacteria such as mold, the color of the joint material is not altered by bacteria, so that the aesthetics of the joint material can be maintained the same as that of the initial installation state, so there is a very excellent effect in appearance.

The common joint material is a product that is always exposed to a humid environment because it is coated on the corners of the bathroom, shower room, and sink with high humidity. Despite the excellent adhesion and transparency of existing types (white cement, white epoxy, transparent aspartic, etc.), due to the humid environment, bacteria such as mold live on the surface of the joint material like black spots, and consumers clean it at regular intervals. There were disadvantages that should be done and it was difficult to realize the color of the original color of the initial joint material itself.

However, in one embodiment, by adding a liquid joint color retaining agent to the curing agent in order to suppress the growth of mold or bacteria, it prevents the growth of bacteria including mold, and prevents the growth of mold even in the environment of high temperature and high humidity structures. Because it can be used, it is characterized by excellent initial color expression and excellent aesthetics.

As described above, a detailed description of the present invention has been made by examples, but since the above-described embodiments have been described only with preferred examples of the present invention, it is understood that the present invention is limited to the above embodiments. No, the scope of the present invention should be understood as the following claims and the concept of equality.

Claims (6)

As a composition for joint materials,
Subjects comprising aliphatic isocyanates; And
Including; a curing agent comprising a plurality of aspartic resins having different weight average molecular weights,
The main material and the curing agent are mixed in a volume ratio of 1:1,
The plurality of aspartic resins include 72 to 77.5% by weight of an aspartic resin having a weight average molecular weight of 3000g/mol; And 10 to 11% by weight of an aspartic resin having a weight average molecular weight of 5000g/mol; and
The curing agent
3 to 5% by weight of a color retaining agent for preventing the color of the joint material from being deteriorated;
0.5 to 1% by weight of antifoam; And
9 to 11% by weight of a pearl pigment; further comprising,
The joint material color retaining agent comprises 50% by weight of inorganic antimicrobial powder and 50% by weight of a diluent so as to secure the transparency of the joint material to produce a sparkling effect by the pearl pigment.
A composition for joint materials having high elasticity and antibacterial properties. The method of claim 1,
The subject above is
Characterized in that it further comprises a; NCO content control agent mixed with the aliphatic isocyanate to control the NCO weight% of the main body
A composition for joint materials with high elasticity and antibacterial properties. The method of claim 2,
The aliphatic isocyanate is 78-82% by weight, and the NCO content control agent is provided in 18-22% by weight.
A composition for joint materials with high elasticity and antibacterial properties. The method of claim 3,
The NCO content control agent is provided with propylene carbonate,
Due to the mixture of the propylene carbonate and the aliphatic isocyanate, the NCO% by weight of the main material is adjusted to 19 to 20% by weight.
A composition for joint materials with high elasticity and antibacterial properties. delete delete

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