KR20100089306A - Composition for moisture-proof coating and moisture-proof paper - Google Patents

Abstract

PURPOSE: A moisture-proof coating composition, and a moisture-proof paper are provided to improve the room temperature releasing property of the composition, and to secure the non-tacky property, the heat resistance, and the durability. CONSTITUTION: A moisture-proof coating composition contains a non-hydrogenated rosin, a non-hydrogenated vegetable oil, and a drying agent. The rosin is selected from the group consisting of a gum rosin, a wood rosin, and a tall oil rosin. The non-hydrogenated vegetable oil contains castor oil. 7~76 parts of vegetable oil by weight is mixed with 100 parts of non-hydrogenated rosin by weight. A moisture-proof paper comprises a substrate, and a moisture-proof containing the moisture-proof coating composition.

Description

Composition for moisture-proof coating and moisture-proof paper {Composition for moisture-proof coating and moisture-proof paper}

The present invention relates to a moisture-proof coating composition and a moisture-proof paper produced using the composition.

Moisture-proof paper generally has excellent physical properties such as tensile strength, tear strength, rupture strength and elongation and is inexpensive on the surface of unbleached or bleached kraft paper of polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). Or synthetic resins, such as urethane (PU), have been used by lamination or melt coating.

Since the moisture-proof paper is manufactured using synthetic resins and solvents that are harmful to the human body, there is a high possibility of releasing harmful substances such as environmental hormones, and therefore, the use of a packaging paper, a paper bag or a paper cup has a problem of being restricted. have.

In addition, in the case of the existing moisture-proof paper, since the material used is disadvantageous for recycling, most of it is landfilled or incinerated, which is also a major cause of environmental pollution.

That is, in the case of a small moisture-proof paper (25 cm or less x 30 cm or less), the paper layer serving as the base material is dissociated by the dissociation process and can be recycled, but the moisture-proof layer including the synthetic resin is incinerated or landfilled after being taken out. In addition, large moisture-proof papers (35 cm or more x 35 cm or more) are made of synthetic resin or the like by the impeller of the dissociator during the dissociation process to raise the power load, thereby making the machine impossible to operate or losing the power motor. Recycling is almost impossible due to the problems brought.

As a technique for solving such a problem, a method of producing a moisture-proof paper by using a water-resistant kraft paper as a paper substrate layer, applying and drying a water-soluble resin on the surface thereof, and then laminating the synthetic resin again. In this technique, since the water-soluble resin layer included in the damp paper at the time of recycling can be dissolved in water, there is an advantage that the recycling rate can be increased. However, this technique has a disadvantage in that the separation of the paper base layer (water resistant kraft paper) and the synthetic resin layer must be made manually.

On the other hand, Korean Patent No. 0329027 discloses a composition for a moisture-proof paper that is environmentally friendly, excellent in flexibility and glossiness, etc., and includes a composition containing hydrogenated rosin resin, wax, and cured oil in a specific content. However, in the case of the moisture-proof paper produced by the above technique, since the rosin and oil included are in a hardened state by hydrogenation treatment, dissociation property, especially room temperature dissociation property, is extremely deteriorated. Accordingly, in the dissociation process for recycling, there is a problem that the finely flaky moisture-proof layer is left in the molten spots on the front surface of the paper produced during the papermaking process to reduce the recycling rate.

The present invention has been made in consideration of the above-mentioned problems of the prior art, while having excellent physical properties such as glossiness, non-tackiness, heat resistance, physical strength, and chemical durability, and excellent moisture dissociation for moisture proof coating that can maximize the recycling rate. It is an object to provide a composition and a moisture resistant paper produced using the above.

The present invention as a means for solving the above problems, provides a composition for moisture-proof coating comprising an uncured feed, uncured vegetable oil and a drying agent.

The present invention as another means for solving the above problems, the base; And it is formed on one side or both sides of the substrate, provides a moisture-proof paper comprising a moisture-proof layer containing a composition for moisture-proof coating according to the invention.

Moisture-proof coating composition of the present invention, including the uncured pine and vegetable oil, and the drying agent, without the hydrogenation treatment, gloss, non-tacky, heat resistance, physical strength (tensile strength, tear strength) And excellent physical properties such as burst strength) and chemical durability, and at the same time have excellent room temperature dissociation, it can provide a moisture-proof paper that can maximize the recycling rate during the recycling process through the dissociation and papermaking process.

The present invention provides a non-hydrogenated sheet; Uncured vegetable oil and

It relates to a composition for moisture proof coating comprising a drying agent.

Hereinafter, the moisture proof coating composition of the present invention will be described in detail.

Moisture-proof coating composition of the present invention is characterized in that it comprises a non-hardened state of the paper. As used herein, the term "non-hydrogenated rosin" refers to a natural pine which is not subjected to hydrogenation hardening treatment, where "song" is a wound of a root or stem of a tree in pine. Refers to a viscous and dense substance secreted from A "hydrogenation hardening process" means the process which normally inserts a hydrogen atom into the oil or resin of the unsaturated state which exists in a liquid state at room temperature, and converts into a saturated oil or resin. In the present invention, by using a non-hardened state of the paper without the hydrogenation curing treatment in this way, while maintaining excellent moisture resistance of the paper can be maximized the room temperature dissociation of the moisture barrier. In the present invention can be used in the non-hydrogenated virgin (virgin) state, gum rosin, wood rosin and tall oil rosin (type or two or more) Included, but not limited to.

Moisture-proof coating composition of the present invention comprises an uncured vegetable oil with the uncured transfer paper as described above, the vegetable oil may play a role of adjusting the overall viscosity of the composition in consideration of the coating process workability and the like. . The term "uncured vegetable oil" used in the present invention means, as described above, an uncured vegetable oil in which no hydrogenation curing treatment has been performed. In the present invention, as the vegetable oil, if the hydrogenation hardening treatment is not performed, environmentally friendly, and harmless to the human body, it is not particularly limited, and various vegetable dry oils, semi-dry oils or undry oils can be used. More specifically, in the present invention, as the vegetable oil, from the group consisting of uncured castor oil, perilla oil, soybean oil, sunflower oil, cottonseed oil, sesame oil, rice bran oil, corn oil, lacquered oil and olive oil that is not hydrogenated hardening treatment One or more selected may be used, of which castor oil in an uncured state is preferably used.

Castor oil is a non-volatile fat derived from the seeds of Ricinus communis belonging to the Euphorbiaceae, most of which (more than 80%) are triglycerides formed from the unsaturated fatty acid ricinoleic acid. consist of. Such castor oil has a high viscosity and a low coefficient of friction, high water retention and a transparent characteristic as compared with other vegetable oils. In the present invention, by using the castor oil containing the characteristic components as a main component in an uncured state, there is an advantage that can be further increased the room temperature dissociation of the final moisture-proof paper.

That is, in the present invention, as the vegetable oil, it is preferable to use a mixed oil including the castor oil alone or further including one or more of the above-described vegetable oils as a main component, but is not limited thereto. .

The vegetable oil is preferably contained in an amount of 7 parts by weight to 76 parts by weight with respect to 100 parts by weight of the above-mentioned uncured pine, and the weight ratio of uncured pine and uncured vegetable oil (uncured pine: uncured vegetable Oil) is preferably 57:43 to 92: 8. If the content of the vegetable oil is less than 7 parts by weight, the film formed by using the composition of the present invention is inferior in flexibility, and there is a risk of cracking in the film, and if it exceeds 76 parts by weight, the viscosity of the composition is excessive. There exists a possibility that it may become high and dryness may fall, or heat resistance may fall.

Moisture-proof coating composition of the present invention further comprises a drying agent in addition to the above-described components, the drying agent may serve to complement the heat resistance and drying resistance of the composition. That is, as described above, when adjusting the viscosity of the composition containing the uncured pine paste as the main component to the uncured vegetable oil, it is possible to ensure excellent dissociation of the final moisture barrier layer, but drying of the coating liquid in the drying process for forming the moisture barrier layer There is a possibility that the heat resistance, physical strength, non-tackiness, chemical durability, etc. may be lowered due to the delay, but this problem can be solved by adding an appropriate amount of the desiccant.

The type of desiccant that can be used in the present invention is not particularly limited as long as it can perform the above-described functions. For example, boric acid, borax, manganese borate, manganese peroxide and manganese sulfate can be used or mixtures of two or more kinds thereof. .

Such a desiccant may be included in an amount of 0.01 parts by weight to 16 parts by weight, preferably 0.05 parts by weight to 4 parts by weight, based on 100 parts by weight of the uncured sheet in the composition of the present invention. If the content is less than 0.01 part by weight, the heat resistance or drying effect of the composition may be lowered. If the content is more than 16 parts by weight, the dryness and / or heat resistance of the composition may be lowered.

Moisture-proof coating composition of the present invention may also comprise a functional material in addition to the aforementioned components. Examples of functional materials that can be used at this time include, but are not limited to, illite, zeolite, ganban stone, precious stone, pearlite and / or ceramics. By appropriately including such a functional material, it is possible to make the moisture-proof paper formed using the composition of the present invention to emit far infrared rays, anions, and the like, thereby making the environment-friendly and hygienic moisture-proof paper possible. In addition, when additionally including the above components, the anion, far-infrared and / or thermal energy, etc. emitted from the damp paper prevents acidification of the human body, promotes physiological action to help to remove the harmful substances, the damp paper of the present invention It can also be used for wellness products.

The present invention also provides a substrate; And

It is formed on one or both sides of the substrate, and relates to a moisture-proof paper comprising a moisture-proof layer containing the composition for moisture-proof coating according to the present invention described above.

The moisture-proof paper of the present invention is prepared using the composition according to the present invention, thereby being excellent in physical properties such as glossiness, non-tackiness, heat resistance, physical strength (tensile strength, tear strength and burst strength, etc.) and chemical durability, With excellent room temperature dissociation, the recycling rate can be maximized during the recycling process through dissociation and papermaking.

In addition, since the moisture-proof paper of the present invention is all made of an environmentally friendly material that is harmless to the human body as described above, it does not emit harmful substances such as environmental hormones, and if it contains a functional substance appropriately, it releases anions, far infrared rays or thermal energy. It is also possible.

The type of substrate that can be used in the moisture proof paper of the present invention is not particularly limited, and any material generally used in this field may be used. Examples of such materials include, but are not limited to, kraft paper, art paper, white paper, woodfree paper and rouge. In the present invention, the thickness of the substrate is also not particularly limited, and may be formed in a conventional thickness in consideration of the use to which the moisture proof paper is applied.

The method for forming the moisture barrier layer on the substrate as described above is not particularly limited, and for example, the composition according to the present invention may be prepared by coating the substrate with a suitable thickness and then drying. More specifically, for example, the moisture-proof paper of the present invention is prepared by the stirring, melting and aging of uncured feedstock, uncured vegetable oil and / or desiccant at a temperature of about 130 ° C to 160 ° C to prepare a coating solution. It can be prepared by the method of coating and drying the phase to an appropriate thickness.

In the present invention, the thickness of the moisture barrier layer formed by the above method may be 15 μm to 70 μm, preferably 15 μm to 25 μm. By setting the thickness of a moisture proof layer to the said range, the physical properties, such as moisture proof and normal temperature dissociation, can be maintained excellent. In addition, by appropriately adjusting the thickness of the moisture barrier layer within the above range, the surface area that the moisture barrier layer can come into contact with reagents such as caustic soda added in the waste paper recycling process is increased, the reaction is activated, and the saponification is promoted to dissociate with water. This can be further increased.

Through the existing recycling process of the moisture-proof paper of the present invention as described above, almost all of the recycling is possible, which is briefly described as follows.

Typically, the recycling process of waste paper goes through a dissociation process and a papermaking process. For the dissociation process, the moisture-proof paper of the present invention is introduced into water at a concentration of about 5% to 6%. In the dissociation process by the dissociation process, the substrate included in the moisture-proof paper is completely dissociated, and the moisture-proof layer has a size of about 0.03 mm to 0.07 mm. Can be broken down. In this state, when caustic soda (ex. 10% caustic soda) is appropriately added to adjust the pH to about 8.0 to 9.0, the granular moisture barrier layer component can be completely dissolved through saponification.

In the above state, when the aluminum sulfate solution is added in an appropriate amount according to the existing method, the saponification agent acts on the aluminum sulfate, and the feed component is finely powdered to be uniformly adsorbed onto the base layer fiber. Thereafter, when dehydration is carried out according to a conventional papermaking process, and the drying process is carried out in a dryer (about 110 ° C to 120 ° C), it is possible to produce clean paper without melting spots while melted and adhered to the substrate component.

Hereinafter, the present invention will be described in more detail through examples according to the present invention and comparative examples not according to the present invention, but the scope of the present invention is not limited to the following examples.

Example 1

100 g of the natural calf was melted at a temperature of about 130 ° C. to 160 ° C., and the viscosity was adjusted while slowly injecting 12 g of vegetable edible soybean oil in an uncured state, followed by 0.1 g of borax as a drying agent. Subsequently, the prepared coating solution was heated for about 10 minutes, left to stand and degassed, and then coated and dried on a general kraft paper surface to prepare a moisture proof paper.

Example 2

100 g of natural pine | melt was melted at the temperature of about 130 degreeC-160 degreeC, and the viscosity was adjusted, injecting 5 g of castor oil and 3 g of olive oil in this order. Subsequently, 0.2 g of manganese borate was injected as a desiccant while heating, stirring and aging the composition having a controlled viscosity to prepare a coating solution. Subsequently, the prepared coating solution was heated for about 10 minutes, left to stand and degassed, and then coated and dried on a general kraft paper surface to prepare a moisture proof paper.

The physical properties of the moisture-proof paper of Examples 1 and 2 prepared above were measured in the following manner, and the results are summarized in Table 1 and described. At this time, as comparative examples, commercially available polyethylene coated moisture-proof paper (Comparative Example 1), polypropylene-coated moisture-proof paper (Comparative Example 2), urethane-coated moisture-proof paper (Comparative Example 3) and hydrogenated rosin, wax as described in Korean Patent No. 0329027. And the moisture-proof paper (Comparative Example 4) manufactured using the composition containing hardening oil was used.

1. Moisture resistance (moisture resistance / waterproof) evaluation

Cups were prepared using the moisture-proof papers of the examples and the comparative examples, and then a predetermined amount (1/2) of water was added thereto and left for 48 hours. After passing through the above process, the case where water did not leak out of the cup was evaluated as good (○), and the case where water leaked out as poor (×).

2. Dissociation Evaluation

The dissociative evaluation of the wetland was measured according to the methods described in KS M 7030 (revised April 9, 1982, issued by the Korean Standards Association) and KS M 7024 (revised January 10, 2001, published by the Korean Standards Association). Specifically, using a standard dissociator disclosed in the above standard, the dissociation treatment is performed on the moisture proof paper, and then diluted to 0.01% to 0.05%, and the naked eye is discriminated to observe the undissociated fraction of the binding fiber or the moisture barrier layer. It evaluated by (x) and evaluated the case where it was not observed as good ((circle)).

3. Recyclability Evaluation

Recyclability evaluation of the damp paper was carried out according to the method described in KS M 7030 (revised April 9, 1982, issued by the Korean Standards Association). Specifically, using a standard dissociator disclosed in the above standard, the dissociation treatment was performed on a moisture proof paper, and then a papermaking paper was prepared. Subsequently, when the prepared sheet was treated in an oven at 105 ° C to 110 ° C, when the melting spots of the skin layer were visually observed, defects (x) were observed.

The results measured in the same manner as described above are summarized in Table 1 below.

Moisture resistance Dissociation Recyclability Example 1 ○ ○ ○ Example 2 ○ ○ ○ Comparative Example 1 ○ × × Comparative Example 2 ○ × × Comparative Example 3 × × × Comparative Example 4 ○ × ×

As can be seen from the results of Table 1, in the case of the moisture proof paper according to the present invention, it exhibited excellent dissociation property and recyclability, while having excellent moisture resistance equal to or higher than that of the conventional moisture proof paper. Specifically, in the case of the moisture-proof paper of Comparative Examples 1 to 4, not only the binding fiber or the moisture-dissociating layer undissociated powder was observed in the dissociation process, but also the melting spots were observed when the manufacturing process was carried out after drying into a paper sheet. It was confirmed that the fall significantly.

Claims (9)

Uncured pine; Uncured vegetable oil and Moisture-proof coating composition comprising a drying agent. The moisture-proof coating composition of claim 1, wherein the rosin is at least one selected from the group consisting of gum rosin, wood rosin, and tall rosin. The moisture-proof coating composition of claim 1, wherein the vegetable oil comprises castor oil. 4. The composition of claim 3, wherein the vegetable oil further comprises at least one selected from the group consisting of perilla oil, soybean oil, sunflower oil, cottonseed oil, sesame oil, rice bran oil, corn oil, lactic oil and olive oil. The composition of claim 1, wherein the vegetable oil is contained in an amount of 7 parts by weight to 76 parts by weight with respect to 100 parts by weight of the uncured transfer paper. The moisture-proof coating composition of claim 1, wherein the desiccant is at least one selected from the group consisting of boric acid, borax, manganese borate, manganese peroxide, and manganese sulfate. The moisture-proof coating composition of claim 1, wherein the desiccant is included in an amount of 0.01 parts by weight to 16 parts by weight based on 100 parts by weight of the uncured sheet. The moisture-proof coating composition of claim 1, further comprising at least one selected from the group consisting of elite, zeolite, elvan, precious stone, pearlite, and ceramics. materials; And a moisture proof layer formed on one side or both sides of the base material and containing the moisture barrier coating composition according to any one of claims 1 to 8.