KR101856424B1 - Coating composition for packaging box - Google Patents

Abstract

The present invention relates to a coating composition for packing boxes. More specifically, the present invention relates to a coating composition for packing boxes, ensuring outstanding durability. To this end, the coating composition for packing boxes contains an acrylic resin, a filler, titanium dioxide, a dispersant, a defoamer, and water. With respect to 100 parts by weight of the acrylic resin, the coating composition comprises 20-30 parts by weight of the filler, 10-20 parts by weight of the titanium dioxide, 1-3 parts by weight of the dispersant, 0.5-2.5 parts by weight of the defoamer, and 100-120 parts by weight of water.

Description

{COATING COMPOSITION FOR PACKAGING BOX}

The present invention relates to a coating composition for a packaging box, and more particularly to a coating composition for a packaging box having excellent durability.

Packing boxes made of paper, corrugated cardboard, styrofoam, etc. are widely used for packing various objects including fruits. Since these packing boxes are vulnerable to shock, the packing box is easily broken or deformed from external impact and stored inside There is a problem in that the quality of the product is deteriorated by being damaged, damaged or deformed because it is not properly protected from external impact during transportation and storage.

In order to solve such a problem, when a product such as fruit is packed in a packaging box, the packaging composition is applied to the inner or outer surface of the packaging box by using a synthetic resin sponge or the like to improve the durability of the packaging box Method and the like have been studied, and synthetic resins such as polyethylenes and polyvinyl chlorides, which are general resins, are used.

However, a coating composition using a synthetic resin is economical because it is low in cost, and an auxiliary agent for imparting plasticity and heat adhesiveness is additionally required. When coating on the inner surface of a packing box, there is an adverse effect on the human body due to dissolution of harmful substances And the environment hormone is released during the disposal process.

To this end, water-soluble coating compositions have been developed in recent years. However, such a water-soluble coating composition has a problem in that not only durability is deteriorated but also antibacterial property, deodorization property and the like are deteriorated.

Accordingly, there is a demand for developing a coating composition for a packaging box that can prevent environmental pollution and has excellent durability.

Korean Registered Patent No. 10-1769000

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a coating composition for a packaging box having excellent durability.

These and other objects and advantages of the present invention will become apparent from the following description of a preferred embodiment.

The object of the present invention is achieved by a process for the production of an acrylic resin composition comprising 20 to 30 parts by weight of a filler, 10 to 20 parts by weight of titanium dioxide, 1 to 3 parts by weight of a dispersant, 0.5 to 2.5 parts by weight of an antifoaming agent and 100 to 120 parts by weight of water.

At this time, the coating composition may further contain an antibacterial agent in an amount of 3 to 8 parts by weight based on 100 parts by weight of the acrylic resin, and the antimicrobial agent is preferably aluminum hydroxide.

The coating composition may further comprise 10 to 15 parts by weight of a deodorant based on 100 parts by weight of the acrylic resin, and the deodorant is preferably activated carbon.

In addition, the coating composition may further include an additive for manifesting various functions, and the additive may be at least any one selected from the group consisting of a binder, an antibacterial agent, a flame retardant agent, and a deodorant agent.

According to the present invention, when used in a packaging box, it has the effect of improving the durability and the like of the packaging box.

In addition, it has an effect of protecting objects in packaging boxes from microorganisms such as bacteria and fungi including antimicrobial agents, and has an effect of catching unpleasant odor such as odor including deodorant.

In addition, it can also have the effect of blocking heat, including flame retardants.

Further, according to the present invention, the coating performance can be further improved by drying at a high temperature and subsequently drying at a low temperature.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a schematic view of a packaging box coating method using a coating composition according to an embodiment of the present invention.
Figure 2 illustrates the step of applying a coating composition according to one embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

Also, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains and, where contradictory, Will be given priority.

In order to clearly illustrate the claimed invention, parts not related to the description are omitted, and like reference numerals are used for like parts throughout the specification. And, when a section is referred to as "including " an element, it does not exclude other elements unless specifically stated to the contrary. In addition, "part" described in the specification means one unit or block performing a specific function.

In each step, the identification code (first, second, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, and each step does not explicitly list a specific order in the context May be performed differently from the above-described sequence. That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

The coating composition for a packaging box according to an embodiment of the present invention comprises an acrylic resin, a defoaming agent, a filler, a dispersant, titanium dioxide and water, wherein 20 to 30 parts by weight of filler, 10 to 20 parts by weight of titanium dioxide 1 to 3 parts by weight of a dispersant, 0.5 to 2.5 parts by weight of a defoaming agent, and 100 to 120 parts by weight of water. When the coating composition of the present invention is coated on the inner or outer surface of a packaging box made of paper or the like and then dried (about 80 to 90 ° C), a coating layer can be formed and the durability of the packaging box can be improved , Thereby protecting the objects in the packaging box. Here, a packaging box made of paper or the like is a packaging box made of paper or corrugated cardboard. The packaging box is made of a thick paper such as a packing paper, paper pulp or waste paper used for transportation and storage of articles, ), And specifically, it may be grafted, liner paper, ivory paperboard, manila paperboard or the like, but is not particularly limited.

The acrylic resin is a polymer derived from an ester such as acrylic acid or methacrylic acid, is colorless and transparent, and has excellent weather resistance, chemical resistance and water resistance. The acrylic resin may be selected from a variety of known resins and is not particularly limited. However, it is preferable to use 40 to 50 parts by weight of methylmethacrylate (MMA), butylacrylate, And 5 to 10 parts by weight of 2-ethylhexylacrylate (2-EHA) are preferably used.

The filler improves mechanical properties such as abrasion resistance and impact resistance of the coating composition, and is preferably included in an amount of 20 to 30 parts by weight based on 100 parts by weight of the acrylic resin. If the amount of the filler is less than 20 parts by weight, the mechanical properties can not be sufficiently improved. If the amount of the filler is more than 30 parts by weight, the viscosity of the coating composition may be excessively increased and it may be difficult to form a uniform coating film. If the filler is a condition for achieving the object of the present invention, various fillers known in the art can be used, and dolomite can be preferably used. The filler is preferably used in the form of a powder, and it is more preferable to use the filler so as to have a particle size of 150 to 200 mesh for mixing.

Titanium dioxide (TiO ₂ ) can improve the heat resistance of the coating composition and can function as an auxiliary filler. The titanium dioxide is preferably contained in an amount of 10 to 20 parts by weight based on 100 parts by weight of the acrylic resin. If the amount of the titanium dioxide is less than 10 parts by weight, the abrasion resistance of the coating layer formed by the coating composition can not be effectively improved. If the amount is more than 20 parts by weight, workability may be deteriorated, . In addition, when titanium dioxide is used as an auxiliary filler and dolomite is used as a filler, it is preferable to mix and use dolomite in a ratio of 1: 1 in order to improve mechanical properties.

The dispersant improves the dispersion of the filler and the like in the coating composition so that the coating composition can be uniformly mixed. The dispersing agent is preferably mixed in an amount of 1 to 3 parts by weight based on 100 parts by weight of the acrylic resin. If the amount of the dispersing agent is less than 1 part by weight, aggregation of the filler or the like may occur. If the dispersing agent is more than 3 parts by weight, compatibility with the acrylic resin may be poor. The dispersing agent is not particularly limited, and various known dispersing agents may be used within the range that does not impair the physical properties. In consideration of affinity with an acrylic resin, it is preferable to use a polyacrylate nonionic dispersing agent.

The defoaming agent is capable of simultaneously performing defoaming and defoaming, and is preferably contained in an amount of 0.5 to 2.5 parts by weight based on 100 parts by weight of the acrylic resin. If the amount is less than 0.5 parts by weight, the defoaming force may be lowered to cause a problem of surface defects such as cracking in the packaging box. If the amount exceeds 2.5 parts by weight, smoothness may be lowered. The defoaming agent may be a mineral oil type, a silicone type (dimethylpolysiloxane, modified polysiloxane), a non-silicone polymer defoaming agent, or the like, but is not limited thereto and various known defoaming agents may be used within the range not impairing the physical properties.

Water is used as a solvent for the coating composition, and is preferably mixed with 100 to 120 parts by weight based on 100 parts by weight of the acrylic resin in order to form an appropriate viscosity.

Meanwhile, the coating composition for a packaging box according to an embodiment of the present invention may further include various additives in order to add various functions. The additive may be at least one selected from the group consisting of a binder, an antibacterial agent, a flame retardant, and a deodorant.

In one embodiment, the binder can use glue in terms of preventing environmental contamination. Glue is a substance that solidifies the liquid of organs such as animal's skin, intestines, bones, etc., and acts as a binder to bind acrylic resin, filler, titanium dioxide, etc., can do. Conventionally, synthetic resins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE) and high density polyethylene (HDPE) have been used as binders for coating compositions. However, they cause the mixed composition to clump well. However, There was concern about emissions. On the other hand, in the case of glue, problems such as the release of environmental hormones can be prevented while enhancing the bonding force between the acrylic resin and each component. The glue is preferably contained in an amount of 15 to 20 parts by weight based on 100 parts by weight of the acrylic resin. When the content of the glue is less than 15 parts by weight, the acrylic resin and the filler can not be properly entangled, and the surface may not be uniformly formed when the coating layer is formed. When the content exceeds 20 parts by weight, There is a concern.

At this time, a silane coupling agent may be further added to complement the functionality of the glue. As the silane coupling agent, a vinyl silane coupling agent can be used. Preferable examples of the silane coupling agent include vinyl trichlorosilane, vinyltrimethoxysilane, and vinyltriethoxysilane, but the present invention is not limited thereto. The silane coupling agent is used for supplementing the functionality of the glue and is preferably used in a small amount and is preferably contained in 1 to 2 parts by weight based on 100 parts by weight of the acrylic resin.

In one embodiment, the antimicrobial agent may be included in an amount of 3 to 8 parts by weight based on 100 parts by weight of the acrylic resin. If the content of the antimicrobial agent is less than 3 parts by weight, it is difficult to exhibit the antimicrobial effect to be achieved. If the amount is more than 8 parts by weight, the compatibility with other components may be impaired. Aluminum hydroxide may be used as the antimicrobial agent, and boehmite (AlO (OH)) is preferably used as the aluminum hydroxide. Boehmite can be any of γ-boehmite, α-boehmite and pseudo-boehmite. Of these, γ-boehmite excellent in crystallinity and excellent in thermal stability and chemical stability, structurally neutral, and excellent in antibacterial property is preferably used. The γ-boehmite can be prepared by supercritical synthesis of only water (pure water) and aluminum (Al).

It is also possible to use calcium oxide instead of aluminum hydroxide. Calcium oxide has a strong sterilization or virucidal effect against bacteria, fungi, and viruses and can be produced by baking the scallop shell. Specifically, the scallop shell is washed, dried and pulverized at low temperature in a non-oxidizing atmosphere at low temperature, baked at 500 to 700 ° C under an air atmosphere, and then baked at 1100 to 1300 ° C At a high temperature and finely pulverized to obtain an average particle diameter of 20 mu m or less.

In one embodiment, the flame retardant is for improving the flame retardancy of the coating composition, and is preferably included in an amount of 1 to 5 parts by weight based on 100 parts by weight of the acrylic resin. When the amount of the flame retardant is less than 1 part by weight, the degree of improvement of the flame retardancy is insignificant. When the amount is more than 5 parts by weight, the flame retardant agent is not only economical but also has poor compatibility with other components. The flame retardant may be a white powder. Alum are used may be potassium alum (potassium aluminum sulfate, AlK (SO _{4) 2} o 12H ₂ O), it can be obtained from natural myeongbanseok. Concretely, it can be produced by dissolving alunculus in water and filtering it, then breaking it, and cooling it if irregularly shaped crystals are formed.

In one embodiment, the deodorant is used to remove the odor in the packaging box when the coating layer is formed using the coating composition, and may be included in an amount of 5 to 10 parts by weight based on 100 parts by weight of the acrylic resin. If the amount is less than 5 parts by weight, the effect of deodorization (bad odor) is insignificant, and if it exceeds 10 parts by weight, it is not economical and there is a fear that mechanical properties of the coating layer are weakened. As the deodorant, activated carbon powder can be used. Activated carbon has many pores and can adsorb molecules that cause deodorization problems, and additionally can exhibit antibacterial effects.

At this time, activated carbon powder and sucrose (C ₁₂ H ₂₂ O ₁₁ ) may be mixed to improve the function of activated carbon. Sucrose not only smoothes the pores formed between the activated carbon powders but also tends to be viscous during the mixing process with acrylic resin or the like, which can catch molecules that cause bad odor problems, thereby contributing to solving the problem of bad odor. The sucrose is preferably a powder having a particle size of from 1 to 120 탆 and containing 95 wt% or more of a filtered 120 mesh, and is preferably contained in an amount of 1 to 3 parts by weight based on 100 parts by weight of the acrylic resin. When the content of sucrose is less than 1 part by weight, the effect expressed by sucrose is insignificant. When the content of sucrose is more than 3 parts by weight, it is not only economical but also deteriorates the mechanical properties of the coating layer.

Next, a packaging box coating method using a coating composition for a packaging box will be described. In describing this, the coating composition is described using but not limited to the above-described coating composition for a packaging box.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a packaging box coating method according to an embodiment of the present invention.

A packaging box coating method according to an embodiment of the present invention includes a first step of preparing a coating composition for a packaging box; A second step of applying a coating composition for a packaging box to an inner surface and / or an outer surface of the packaging box; And a third step of drying the packaging box to which the coating composition is applied. The present invention has the effect of improving the durability of the packaging box by coating the coating composition on the inner or outer surface of the packaging box.

The first step is a step of preparing a coating composition, wherein the coating composition described above can be used. The above-mentioned coating composition is excellent in heat resistance and abrasion resistance, and can improve antibacterial and flame retardancy through various additives and prevent environmental pollution problems.

The second step is a step of applying the coating composition to the inner surface and / or the outer surface of the packaging box. Various known methods can be used for applying the coating composition. In order to improve the efficiency of production, It is preferable to spray the coating composition on the inner and / or outer surface of the packaging box to be transported through the packaging box.

The third step is to dry the packaging box coated with the coating composition to form a coating layer, wherein the drying temperature is preferably 74 to 91 ° C. If the drying temperature is lower than 74 캜, the coating composition may not be completely dried. If the drying temperature is higher than 91 캜, a part of the coating layer formed due to the excessive high temperature may be damaged and the coating state of the packaging box may not be uniform. In the third step, when drying the foam box, the drying temperature may be divided into three stages (first drying step, second drying step, and third drying step). First, in the first drying step, drying is performed by heating to 89 ° C to 91 ° C. In the second drying step, drying is performed by heating to 79 ° C to 81 ° C, and drying is performed by heating to 74 ° C to 76 ° C in the third drying step. That is, it is dried at a high temperature and then dried while gradually lowering the temperature. The coating liquid is applied to the foam box and dried at a high temperature so that the coating liquid can be easily adhered to the foam box. Thereafter, the temperature is gradually lowered and dried. If the drying is continued at a high temperature, the second drying step and the third drying step are carried out while lowering the temperature because there is a possibility of damage.

Fig. 2 is an embodiment showing a coating step of the second step.

Hereinafter, the structure and effects of the present invention will be described in more detail with reference to specific examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

[Example 1]

25 parts by weight of dolomite, 15 parts by weight of titanium dioxide, 3 parts by weight of polyacrylic dispersant, 2 parts by weight of silicone defoamer and 100 parts by weight of water were mixed with 100 parts by weight of acrylic resin to prepare a coating composition.

[Example 2]

Except that 15 parts by weight of glue and 2 parts by weight of a silane coupling agent were further added to prepare a coating composition.

[Example 3]

The coating composition was prepared in the same manner as in Example 2 except that 7 parts by weight of boehmite was further added.

[Example 4]

5 parts by weight of activated carbon powder and 3 parts by weight of sucrose were further added in the same manner as in Example 3 to prepare a coating composition.

[Experimental Example]

Coating uniformity measurement

The coating compositions of Examples 1 and 2 were applied to the outer surface of a packaging box made of paper and then dried to prepare a coating layer. The average coating thickness and condition (uniformity) were confirmed and are shown in Table 1 below. The coating thickness was measured using a laser sensor (N2 laser, oscillation wavelength 337.1 nm, UDHO Laser, LTD., Japan), and 30 points were randomly selected and their surface roughness was measured , And less than ± 0.3 was uniform, and more than ± 0.3 was evaluated as non-uniform.

 [Table 1]

In both Examples 1 and 2, the application state was uniform, but it was found that Example 2, in which glue was added, was coated with a relatively much more smooth surface.

Antibacterial test

The antibacterial activity test (JIS Z 2801) was carried out for Examples 1 and 3. Staphylococcus aureus ATCC 6538 (Staphylococcus aureus) and Escherichia coli ATCC 25922 (Escherichia coli) were used as test strains, and the antibacterial activity (antibacterial activity value) was evaluated and shown in Table 2 below.

[Table 2]

The antimicrobial activity value refers to a value obtained by evaluating the degree of antimicrobial activity by comparing the number of strains cultured for a certain period of time. When the value is 1 or more, 90% or more of the strains are present, 2 or more are 99% , More than 99.99% of the strain is over 4, and more than 5 is more than 99.999% of the strain is killed. In Example 3, it was confirmed that the antibacterial effect by boehmite was exhibited.

Odor test

The odor test was carried out for Examples 1 and 4, and the results are shown in Table 3 below.

[Table 3]

In the case of Example 1, a part was generated, but it was insignificant (?). On the other hand, in Example 4 in which activated carbon was added, it was confirmed that there was almost no problem of offensive odor.

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (5)

Acrylic resin, filler, titanium dioxide, dispersant, defoamer, additive and water,
20 to 30 parts by weight of a filler, 10 to 20 parts by weight of titanium dioxide, 1 to 3 parts by weight of a dispersant, 0.5 to 2.5 parts by weight of an antifoaming agent and 100 to 120 parts by weight of water, based on 100 parts by weight of an acrylic resin,
The acrylic resin is prepared by mixing 40 to 50 parts by weight of methylmethacrylate (MMA), 5 to 10 parts by weight of butylacrylate and 5 to 10 parts by weight of 2-ethylhexylacrylate (2-EHA) Mixed aqueous acrylic resin,
The filler is dolomite,
The additive includes a binder, a flame retardant, an antibacterial agent and a deodorant,
The binder includes a glue and a silane coupling agent, wherein the glue and the silane coupling agent are contained in an amount of 15 to 20 parts by weight and 1 to 2 parts by weight with respect to 100 parts by weight of the acrylic resin,
The flame retardant includes a white powder, wherein the white powder is contained in an amount of 1 to 5 parts by weight based on 100 parts by weight of the acrylic resin,
The antimicrobial agent includes? -Behoiemite, wherein? -Behohexite is contained in an amount of 3 to 8 parts by weight based on 100 parts by weight of the acrylic resin,
Wherein the deodorant comprises activated carbon and sucrose, wherein the amount of activated carbon and sucrose is 5 to 10 parts by weight and 1 to 3 parts by weight, respectively, based on 100 parts by weight of the acrylic resin.
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