KR102612050B1 - Coating Composition having Excellent Peelability for Eco-friendly Release Paper and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a coating composition for eco-friendly release paper with excellent peelability and a manufacturing method thereof. More specifically, it is possible to manufacture eco-friendly release paper that does not contain polyethylene and is recyclable, and the moisture resistance, oil resistance, and heat resistance of the release paper are improved. It relates to a coating composition that not only improves but also has excellent peelability and a method of manufacturing the same.
According to the present invention, in order to achieve the above object, according to an embodiment of the present invention, 20 to 30 parts by weight of a silicone emulsion composed of polyurethane and polydimethylsiloxane; 30 to 60 parts by weight of an aqueous acrylic emulsion composed of butyl acrylate, styrene, and acrylamide; 1 to 5 parts by weight of a viscosity agent composed of an acrylic copolymer; 5 to 40 parts by weight of filler; and 10 to 15 parts by weight of solvent. A coating composition for eco-friendly release paper with excellent peelability can be provided, comprising: a silicone emulsion manufacturing step of mixing polyurethane and polydimethylsiloxane to prepare a silicone emulsion; An aqueous acrylic emulsion is prepared by mixing butyl acrylate, styrene, and acrylamide, and the aqueous acrylic emulsion is dissolved in a solvent at room temperature and then mixed with the silicone emulsion. Emulsion manufacturing step; A filler addition step of adding and mixing a filler into the aqueous acrylic emulsion mixed with the silicone emulsion; And a viscosity adjustment step of adding a viscosity agent to the aqueous acrylic emulsion to which the filler has been added to obtain a coating composition having a predetermined viscosity. A method for producing a coating composition for eco-friendly release paper with excellent peelability can be provided. .

Description

Coating composition for eco-friendly release paper with excellent peelability and manufacturing method thereof {Coating Composition having Excellent Peelability for Eco-friendly Release Paper and Manufacturing Method thereof}

The present invention relates to a coating composition for eco-friendly release paper with excellent peelability and a manufacturing method thereof. More specifically, it is possible to manufacture eco-friendly release paper that does not contain polyethylene and is recyclable, and the moisture resistance, oil resistance, and heat resistance of the release paper are improved. It relates to a coating composition that not only improves but also has excellent peelability and a method of manufacturing the same.

Release paper is a protective paper coated with a fine silicone release agent on the back to protect the adhesive components of adhesive tapes, sheets, etc., and has surface processing so that it can be easily peeled off when using the adhesive side.

Conventional release paper has kraft paper or release paper with a high pulp content as its bottom surface to enhance moisture resistance, and a polyethylene (PE) layer and a silicone layer are sequentially laminated on the upper surface.

However, since this conventional release paper is manufactured by combining polyethylene with paper by coating or laminating, when discarded after use, the paper and the coated polyethylene layer cannot be separated or decomposed from each other, making it impossible to recycle. This causes environmental pollution problems such as the mass production of pollutant waste.

In addition, as release paper coated with a polyethylene layer requires separate facilities such as incineration facilities to dispose of, there is a problem in that used release paper is discarded in an unattended state, causing environmental pollution.

In addition, as the release paper used in conventional double-sided tape is made of paper, polyethylene, and silicone, the polyethylene inserted in the center cannot withstand a temperature of 160°C and shrinks, which causes polyethylene to curl. There is a problem that process defects occur because mold release is not possible when it occurs.

To solve this problem, Korean Patent No. 10-0315994 forms a basic coating layer with a water-soluble polymer material and a silicone release agent layer. When the release paper is placed in water after use, the water-soluble polymer material melts and the silicone release agent layer can be separated. However, there is a problem in that when manufacturing the silicone release agent layer, normal hexane and toluene are mixed, and toluene can cause harmful effects on the nervous system, threatening the safety of workers. .

In addition, Korea Patent Publication No. 10-2005-0111949 discloses a method of manufacturing silicone release paper that is first coated with an acrylic film and secondly coated with silicone on the top of the acrylic film to prevent blocking and is recyclable, as well as technology for silicone release paper. However, there is a problem in that it is somewhat lacking in eco-friendliness due to the use of methanol and toluene, which are petroleum-based organic solvents.

Republic of Korea Patent Publication No. 10-0315994 (2001.11.15.) Republic of Korea Patent Publication No. 10-2005-0111949 (2005.11.29.)

The present invention was devised to solve the above problems, and the purpose of the present invention is to improve the moisture resistance, oil resistance, and heat resistance of the release paper, as well as improve the quality of the release paper due to its excellent peelability, and does not contain polyethylene. To provide a coating composition for eco-friendly release paper with excellent peelability and a method for manufacturing the same, which allows the production of eco-friendly release paper that is recyclable.

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

In order to achieve the above object, the present invention, according to an embodiment of the present invention, includes 20 to 30 parts by weight of a silicone emulsion composed of polyurethane and polydimethylsiloxane; 30 to 60 parts by weight of an aqueous acrylic emulsion composed of butyl acrylate, styrene, and acrylamide; 1 to 5 parts by weight of a viscosity agent composed of an acrylic copolymer; 5 to 40 parts by weight of filler; It is possible to provide an eco-friendly coating composition for release paper with excellent peelability, including 10 to 15 parts by weight of solvent.

At this time, the aqueous acrylic emulsion is characterized as a mixed resin formed by mixing 50 to 60 parts by weight of butylacrylate, 25 to 35 parts by weight of styrene, and 10 to 15 parts by weight of acrylamide.

In addition, the filler is characterized as being a porous ceramic powder containing aluminum silicate as a main ingredient.

In addition, the coating composition is characterized by further comprising 0.01 to 3 parts by weight of a pH adjuster consisting of 2-amino-2-methyl-1-propanol.

In addition, the solvent is characterized in that it is formed by adding and mixing one or more additives selected from the group consisting of a viscosity agent, an antifoaming agent, a dispersing agent, an anti-freezing agent, an antibacterial agent, and a TG regulator with an inorganic solvent.

Here, the coating layer formed from the coating composition has a heat resistance temperature of 150 to 160°C and a residual adhesion of 80 to 85%.

Meanwhile, according to an embodiment of the present invention, a silicone emulsion manufacturing step of preparing a silicone emulsion by mixing polyurethane and polydimethylsiloxane; An aqueous acrylic emulsion is prepared by mixing butyl acrylate, styrene, and acrylamide, and the aqueous acrylic emulsion is dissolved in a solvent at room temperature and then mixed with the silicone emulsion. Emulsion manufacturing step; A filler addition step of adding and mixing a filler into the aqueous acrylic emulsion mixed with the silicone emulsion; And a viscosity adjustment step of adding a viscosity agent to the aqueous acrylic emulsion to which the filler has been added to obtain a coating composition having a predetermined viscosity. A method for producing a coating composition for eco-friendly release paper with excellent peelability can be provided. .

Here, the coating composition includes 20 to 30 parts by weight of the silicone emulsion, 30 to 60 parts by weight of the aqueous acrylic emulsion, 1 to 5 parts by weight of the viscosity agent, 5 to 40 parts by weight of the filler, and 10 parts by weight of the solvent. It is characterized in that it consists of 15 to 15 parts by weight.

At this time, the aqueous acrylic emulsion is characterized as a mixed resin formed by mixing 50 to 60 parts by weight of butylacrylate, 25 to 35 parts by weight of styrene, and 10 to 15 parts by weight of acrylamide.

In addition, the filler is characterized as being a porous ceramic powder containing aluminum silicate as a main ingredient.

Meanwhile, after the filler addition step, a pH adjuster consisting of 2-amino-2-methyl-1-propanol is added to the aqueous acrylic emulsion to adjust the acidity of the aqueous acrylic emulsion. It is characterized in that it further includes a step of adding a pH adjuster to adjust.

In addition, the solvent is characterized in that it is formed by adding and mixing one or more additives selected from the group consisting of a viscosity agent, antifoaming agent, dispersing agent, anti-freezing agent, antibacterial agent, and TG regulator with an inorganic solvent.

At this time, the coating layer formed from the coating composition is characterized by a heat resistance temperature of 150 to 160°C and a residual adhesion rate of 80 to 85%.

According to the present invention, not only can the moisture resistance, oil resistance, and heat resistance of the release paper be improved, but also the quality of the release paper can be improved by having excellent peelability, and it is possible to manufacture an eco-friendly release paper that is recyclable because it does not contain polyethylene. There is an advantage.

Figure 1 is a process flow chart showing a method of manufacturing a coating composition for eco-friendly release paper with excellent peelability according to the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Specific details for implementing the present invention will be described in detail with reference to the drawings attached below. Regardless of the drawings, the same reference numerals refer to the same elements, and “and/or” includes each and all combinations of one or more of the mentioned items.

The terminology used herein is for describing embodiments and is not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other elements in addition to the mentioned elements.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly specifically defined.

Hereinafter, with reference to the attached drawings, the manufacturing method of the present invention's eco-friendly coating composition for release paper with excellent peelability will be described in detail.

Figure 1 is a process flow chart showing a method of manufacturing a coating composition for eco-friendly release paper with excellent peelability according to the present invention.

As shown in Figure 1, the manufacturing method of an eco-friendly coating composition for release paper with excellent peelability largely includes a silicone emulsion manufacturing step (S20), an aqueous acrylic emulsion manufacturing step (S30), a filler addition step (S40), and a pH adjustment step ( S50) and viscosity control step (S70).

First, prior to manufacturing the coating composition, a solvent preparation step (S10) of preparing and preparing a solvent to be used in the aqueous acrylic emulsion manufacturing step (S30), which will be described later, must be performed in advance.

Preferably, it is formed by adding and mixing one or more additives selected from the group consisting of a viscosity agent, antifoaming agent, dispersant, antifreeze agent, antibacterial agent, and TG regulator to the inorganic solvent through the solvent preparation step (S10), and is preferably a representative inorganic solvent. The solvent having a predetermined viscosity is formed by sequentially adding a viscosity agent, antifoaming agent, dispersant, antifreeze agent, antibacterial agent, viscosity agent, TG regulator, and dispersant to water.

At this time, the viscosity agent may be an acrylic copolymer.

In addition, the antifoaming agent is added to ensure that a mixing reaction occurs stably between the materials included in the coating composition in the subsequent process after the solvent preparation step (S10), and preferably a nonionic surfactant is used. It can be used, and more preferably, one or two or more types selected from the group consisting of sodium lauryl sulfate, stearyltrimethylammonium, and polyoxyethylene alkyl ether are used. You can.

In addition, the dispersant is TiO ₂ , and the dispersant ensures good mixing of the resin and the filler to be described later, and allows the coating composition to provide UV absorption and antibacterial effects through photocatalytic activity.

In addition, the antibacterial agent is methylisothiazolinone. As is well known, methylisothiazolinone is a heterocyclic organic compound and has an antibacterial effect that inhibits the growth of bacteria, yeast, and fungi, so the coating agent It exerts an antibacterial function so that adhesive tape or sheets to which the release paper coated with the composition can be attached are not contaminated during the distribution process.

When the preparation of the solvent is completed through the solvent preparation step (S10), the silicone emulsion preparation step (S20) is performed.

The silicone emulsion manufacturing step (S20) is a process of preparing a silicone emulsion by mixing polyurethane and polydimethylsiloxane. The present invention uses an organic solvent as the silicone emulsion and the water-based acrylic emulsion described later are manufactured and used in the form of an emulsion. Therefore, the reaction of the coating composition can be performed stably.

In addition, by mixing the polyurethane and the polydimethylsiloxane to prepare a silicone emulsion, release properties and coating properties can be improved, and the heat resistance of the coating layer formed from the coating composition can be maximized.

Next, the aqueous acrylic emulsion manufacturing step (S30) is a step for producing an aqueous acrylic emulsion, by mixing butyl acrylate, styrene, and acrylamide at room temperature. The aqueous acrylic emulsion is prepared, 30 to 60 parts by weight of the aqueous acrylic emulsion is dissolved in 10 to 15 parts by weight of the solvent, and then mixed with 20 to 30 parts by weight of the silicone emulsion by stirring.

At this time, the mixed resin may be formed by mixing 50 to 60 parts by weight of the butylacrylate, 25 to 35 parts by weight of the styrene, and 10 to 15 parts by weight of the acrylamide, based on 100 parts by weight of the aqueous acrylic emulsion. there is.

Meanwhile, after the aqueous acrylic emulsion preparation step (S30), the filler addition step (S40) of adding a filler to the aqueous acrylic emulsion is performed.

In the filler addition step (S40), 10 to 40 parts by weight of the filler is added. At this time, porous ceramic powder containing aluminum silicate as the main ingredient may be used as the filler.

The porous ceramic powder mainly composed of aluminum silicate used as the filler has a minimum surface area per volume, a light specific gravity of about 0.15 to 0.18, strong compressive strength, low shrinkage, and a thermal conductivity of about 0.04 kcal/㎡.hr. Since it is within .℃, heat resistance can be provided so that the packaging material coated with the coating composition can sufficiently exert cold and warm insulation functions.

Next, the aqueous acrylic emulsion to which the filler is added is manufactured into a coating composition having a predetermined acidity (pH) and a predetermined viscosity by sequentially performing the pH adjustment step (S40) and the viscosity adjustment step (S70). .

Preferably, in the pH adjustment step (S40) after the filler addition step (S40), 2-amino-2-methyl-1-propanol is added to the aqueous acrylic emulsion. The acidity of the aqueous acrylic emulsion is adjusted by adding a pH adjuster, and in the viscosity adjustment step (S70), 1 to 5 parts by weight of a viscosity agent composed of an acrylic copolymer is added to the aqueous acrylic emulsion and stirred, thereby Not only can the adhesion efficiency of the coating composition be achieved to a certain level, but it is also possible to obtain a coating composition having a certain level of viscosity that can efficiently shorten the drying time of the coating composition.

Meanwhile, before performing the viscosity adjustment step (S70), an antifoaming agent is additionally added and mixed to the aqueous acrylic emulsion having a predetermined acidity to ensure that a stable reaction occurs when the aqueous acrylic emulsion is mixed with the additives. An addition step (S60) may be additionally performed.

At this time, the antifoaming agent may be a nonionic surfactant used in the solvent preparation step (S10), and is preferably sodium lauryl sulfate, stearyltrimethylammonium, and polyoxyethylene alkyl ether. (polyoxyethylene alkyl ether). One or two or more types selected from the group consisting of polyoxyethylene alkyl ether can be used in combination.

Next, the present invention will be described in more detail through specific examples and test examples of the present invention.

Example

After mixing 40g of aqueous acrylic emulsion with 15g of solvent at room temperature, add 20g of silicone emulsion prepared by mixing polyurethane and polydimethylsiloxane, raise the temperature to a temperature of 40 to 45°C and stir, and aqueous acrylic mixed with silicone emulsion. Add 20g of filler to the emulsion and stir for an additional 30 minutes.

Afterwards, 2 g of a pH adjuster consisting of 2-amino-2-methyl-1-propanol, 2 g of a viscosity agent, and 1 g of an antifoaming agent were added and stirred for an additional 30 minutes to form a coating composition. Manufactured.

Manufacturing example

The coating solution was coated on paper to form a coating layer. After primer treatment, silicone coating was applied, and a sample of 50 mm x 175 mm was prepared using release paper prepared by drying in a chamber and then cooling.

Comparative Example 1

Proceeding in the same manner as in the above example, a coating solution was prepared without adding silicone emulsion, and a sample was prepared with the coating solution in the same manner as in the above preparation example.

Comparative Example 2

Proceeding in the same manner as in the above example, a coating solution was prepared without adding an aqueous acrylic emulsion, and a sample was prepared with the coating solution in the same manner as in the above preparation example.

Comparative Example 3

The coating solution was prepared in the same manner as in the above example, but without adding any filler, and a sample was prepared using the coating solution in the same manner as in the preparation example.

Test example 1

To measure heat resistance, Preparation Examples and Comparative Examples 1 to 3 of the present invention were heated at 160°C to 180°C for 10 minutes and then tested at a 180° angle at a test speed of 300 mm per minute according to the FINAT TEST METHOD No.3 standard. The peeling force was measured and the results are shown in Table 1.

Test example 2

To measure the residual adhesion, Preparation Examples and Comparative Examples 1 to 3 of the present invention were tested according to the FINAT TEST METHOD No. 3 standard, and the peel adhesion was measured at a 180° angle at a test speed of 300 mm per minute to determine the residual adhesion. The rate (ratio (%) to the standard peeling force) was calculated, the obtained value was used as the residual adhesion rate, and the results are shown in Table 1.

division Manufacturing example Comparative Example 1 Comparative Example 2 Comparative Example 3 heat resistance 160℃ 153℃ 150℃ 128℃ Residual adhesion (%) 82.5 83.1 80.5 77.5

As shown in Table 1, the residual adhesion refers to the degree of residue remaining on the attachment surface upon peeling, and the higher the residual adhesion of the release paper, the higher the performance of the release paper is evaluated. Preparation Example and Comparative Example 1 The performance of the release paper was high, but while the manufacturing example showed excellent heat resistance, the heat resistance of Comparative Example 1, which did not contain a silicone emulsion, was confirmed to be relatively low.

In addition, Comparative Example 3, which did not contain any filler, showed low values in both heat resistance and residual adhesion.

Test example 3

In order to measure water resistance and oil resistance, 5 g of water and cooking oil were applied to the surfaces of Preparation Examples and Comparative Examples 1 to 3 of the present invention, and then left at room temperature for 24 hours to visually observe the degree of wetness of the water and cooking oil. , the results are shown in Table 2.

division Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 water resistance ◎ ○ ○ ◎ oil resistance ◎ △ ○ ○

◎: Not wet at all, ○: Wet at 5% or less, △: Wet at 10% or less.

As shown in Table 2, it was confirmed that the preparation example had excellent water and oil resistance compared to Comparative Examples 1 to 3, as it was not wetted at all by water and cooking oil.

Although embodiments of the present invention have been described with reference to the above and the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical idea or essential features. You will understand that it exists. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

S10: Solvent preparation step
S20: Silicone emulsion
S30: Water-based acrylic emulsion manufacturing step
S40: Filler addition step
S50: pH adjustment step
S60: Defoaming agent addition step
S70: Viscosity adjustment step

Claims (13)

In the coating composition for eco-friendly release paper with excellent peelability,
20 to 30 parts by weight of a silicone emulsion composed of polyurethane and polydimethylsiloxane;
30 to 60 parts by weight of an aqueous acrylic emulsion composed of butyl acrylate, styrene, and acrylamide;
1 to 5 parts by weight of a viscosity agent composed of an acrylic copolymer;
5 to 40 parts by weight of a filler made of porous ceramic powder containing aluminum silicate; and
A coating composition comprising 10 to 15 parts by weight of a solvent formed by adding and mixing one or more additives selected from the group consisting of a viscosity agent, an antifoaming agent, a dispersing agent, an antifreezing agent, an antibacterial agent, and a TG regulator to an inorganic solvent.
According to paragraph 1,
The water-based acrylic emulsion is,
A coating composition, characterized in that it is a mixed resin formed by mixing 50 to 60 parts by weight of the butylacrylate, 25 to 35 parts by weight of the styrene, and 10 to 15 parts by weight of the acrylamide.
delete According to paragraph 1,
A coating composition further comprising 0.01 to 3 parts by weight of a pH adjuster consisting of 2-amino-2-methyl-1-propanol.
delete According to paragraph 1,
The coating layer formed from the coating composition has a heat resistance temperature of 150 to 160°C and a residual adhesion of 80 to 85%.
In the method of manufacturing an eco-friendly coating composition for release paper with excellent peelability,
A silicone emulsion manufacturing step of mixing polyurethane and polydimethylsiloxane to prepare a silicone emulsion;
An aqueous acrylic emulsion is prepared by mixing butyl acrylate, styrene, and acrylamide, and the aqueous acrylic emulsion is mixed with an inorganic solvent at room temperature and added with a viscosity agent, antifoaming agent, dispersant, antifreeze agent, and antibacterial agent. and an aqueous acrylic emulsion manufacturing step of dissolving in a solvent formed by adding and mixing one or more additives selected from among TG regulators and then mixing them with the silicone emulsion;
A filler addition step of adding and mixing a filler formed of porous ceramic powder containing aluminum silicate into the aqueous acrylic emulsion mixed with the silicone emulsion; and
A method of producing a coating composition for eco-friendly release paper with excellent peelability, comprising: adding a viscosity agent to the aqueous acrylic emulsion to which the filler has been added to obtain a coating composition having a predetermined viscosity.
In clause 7,
The coating composition is,
20 to 30 parts by weight of the silicone emulsion,
30 to 60 parts by weight of the aqueous acrylic emulsion,
1 to 5 parts by weight of the viscosity agent,
5 to 40 parts by weight of the filler,
A method for producing an eco-friendly coating composition for release paper with excellent peelability, characterized in that it consists of 10 to 15 parts by weight of the solvent.
In clause 7,
The water-based acrylic emulsion is,
Preparation of a coating composition for eco-friendly release paper with excellent peelability, characterized in that it is a mixed resin formed by mixing 50 to 60 parts by weight of the butylacrylate, 25 to 35 parts by weight of the styrene, and 10 to 15 parts by weight of the acrylamide. method.
delete In clause 7,
After the filler addition step, the acidity of the aqueous acrylic emulsion is adjusted by adding a pH adjuster consisting of 2-amino-2-methyl-1-propanol (2-amino-2-methyl-1-propanol) to the aqueous acrylic emulsion. A method for producing a coating composition for eco-friendly release paper with excellent peelability, further comprising adding a pH adjuster.
delete In clause 7,
A method of producing an eco-friendly coating composition for release paper with excellent peelability, wherein the coating layer formed from the release paper coating solution has a heat resistance temperature of 150 to 160° C. and a residual adhesion of 80 to 85%.