KR100978695B1 - Method of making a surface sizing agent of the agar-agar extracted from the red algae - Google Patents

Abstract

The present invention relates to a method for producing a paper surface size agent using a radish extracted from red algae, and more specifically, a) extracting the radish through an aqueous solution of inorganic acid in red algae; b) removing inorganic impurities from the liquid agar; c) bleaching the liquid radish from which the impurities have been removed using an oxidizing agent and adjusting the viscosity; d) adding at least one agent selected from a viscosity modifier or size agent to the bleached, viscosity-adjusted liquid radish; e) drying the processed radish to prepare a powder; And f) preparing the powder in a liquid phase.

In addition, the title of the present invention, when using a paper surface sizing agent using the radish extracted from red algae, the surface strength of the paper is increased compared to the surface sizing agent of the conventional starch system, improving the printability and opacity improvement effect It is very economical because it can produce cheaper products than starch.

Surface sizing agent, surface sizing, agar, opacity, printability, optical properties

Description

Method for making paper surface sizing agent using radish extracted from red algae {Method of making a surface sizing agent of the agar-agar extracted from the red algae}

The present invention relates to a method for producing a paper surface sizing agent using a radish extracted from red algae, and more particularly, a method of using a radish for surface sizing, as well as replacing the starch surface sizing agent which is becoming unstable at a low price. The present invention relates to a method for preparing a paper surface sizing agent using radish extracted from red algae, which has a simple pretreatment without the need for gelatinization and has an effect of improving surface strength, opacity and printability.

In general, pulp is too long and coarse or lacks entanglement if the fiber is intact, making it difficult to obtain a material to be made in strength, transparency, and touch. There are a number of processes that require mechanical treatment of the pulp to suit the application. Among them, surface sizing is an important process that is indispensable to papermaking technology. Basically, the film using starch is formed on the paper surface to reduce the pore size of the paper surface, and it slows down the penetration rate of liquid such as printing ink. Aims to improve). Through surface sizing, starch sizing on the paper surface improves physical properties such as surface properties and strength of the paper, while reducing the occurrence of equity and suppressing curls and cockles generated during storage or processing of the paper. The dimensional stability can be improved. If the surface sizing degree is low, problems such as paper strength or stakes are generated and printability is lowered. If the surface sizing degree is too high, curling may occur.

Oxide starch for the surface of the paper widely used at present is excellent in gelatinization stability and penetrates into the paper to increase the internal bonding force, but has the disadvantage of lowering the opacity. When recycling paper sized with oxidized starch, the oxidized starch acts as an anionic trash, increasing the chemical oxygen demand (COD) load in the system, reducing the effectiveness of the retention enhancer, and causing loss of raw materials. There is a problem. In addition, starch has recently been used as a raw material for ethanol production, forming a competitive relationship with the existing role used as food, there is a problem that the price is not stable because the price is soaring.

Currently, domestically used starch for surface sizing includes oxidized starch, which is mainly composed of corn, tapioca, and potato, and general starch for self-modification. Self-denatured starch is an enzyme or ammonium persulfate (APS) that cuts the starch chain length to the appropriate viscosity. Self-modifying starch tends to cause aging of starch gelatinized liquor easily and cause process problems due to foreign matter generation. In addition, the starch chain length is short cut into the sugar (sugar) to reduce the film-forming ability, the water resistance is lowered tends to decrease the sizing effect. Oxidized starch is a starch company using an oxidant to adjust the viscosity of the starch according to the user's requirements, water holdout (improved water retention), it is improved the luxury stability than starch for self-modification.

However, due to the recent trend of lowering starch viscosity due to the higher speed of paper machine, starch penetrates into the paper, resulting in weaker starch film strength, less surface strength improvement effect, and lowering optical properties of the paper. have. In addition, in the case of starch, it should be used to gelatinize at a temperature of 80 ℃ or more for a certain time, there is a disadvantage that the energy cost, labor costs, facility investment costs are high.

In recent years, starch has tended to be rapidly used in the production of ethanol, the price is rising due to supply problems, and the price is expected to increase in the future.

Red algae are diverse and inhabited all over the world, and their growth rate is also fast. It has been reported that 66 tons of red algae can be produced per year per year. Agar is the cell wall component of these red algae and is a viscous, indigestible complex polysaccharide. The results of research on the structure of sol and gel according to temperature change are known, and agarose and agaropectin are disordered linearly in linear molecular structure at high temperature. It has a structure that is stretched and contains a large amount of water in between, but when the temperature decreases, some of the molecules begin to form crosslinks, and a regular three-dimensional structure is formed to increase density and crosslinking occurs. It has been reported to form a gel structure.

Techniques related to waste paper using agar and paper mulching using hay (Korean Patent Application No. 2003-0041311) are known. However, in the paper mulching, only the method of using the radish for paper mulching for controlling the viscosity is given, and there is no mention of a technique for sizing.

Daikon is currently used as a food additive, as a medium for microorganisms and as a support for electrophoresis, but its use is very small.

The present invention is to solve the problems of the prior art to extract the radish from red algae and then bleached by oxidizing the treatment, it is not necessary to gelatinization by adjusting the viscosity, optical properties, printing aptitude preparation method for improving the printability The purpose is to provide.

The object of the present invention is a) extracting the radish through an aqueous solution of inorganic acid in red algae; b) removing inorganic impurities from the liquid agar; c) bleaching the liquid radish from which the impurities have been removed using an oxidizing agent and adjusting the viscosity; d) adding at least one agent selected from viscosity regulators and size agents to the bleached and viscosity-adjusted liquid radish; e) drying the processed radish to prepare a powder; And f) preparing the powder in a liquid phase. It can be achieved by providing a method for preparing a paper surface sizing agent using a radish extracted from red algae.

In addition, the present invention is to solve the problems of the prior art to extract the radish from red algae and then bleached by oxidizing it, and to adjust the viscosity does not require gelatinization, to produce a surface size agent that improves optical properties, printability The purpose is to provide a method.

The object of the present invention is a) extracting the radish through an aqueous solution of inorganic acid in red algae; b) removing inorganic impurities from the liquid agar; c) preparing a powder by drying the milk after the a) or a), b) step; d) preparing the powder in a liquid phase; e) bleaching with an oxidizing agent in the liquid phase and adjusting the viscosity; And f) preparing a paper surface size agent by adding one or more drugs selected from the viscosity adjusting agent and the sizing agent to the bleached, viscosity-adjusted liquid radish; paper surface size agent using the radish extracted from red alga It can achieve by providing the manufacturing method of the.

Method for producing a paper surface size agent using the radish extracted from red algae of the present invention comprises the steps of: a) extracting the radish from the red algae through an aqueous solution of inorganic acid; b) removing inorganic impurities from the liquid agar; c) bleaching the liquid radish from which the impurities have been removed using an oxidizing agent and adjusting the viscosity; d) adding at least one drug selected from a viscosity modifier and a size agent to the bleached, viscosity-adjusted liquid radish; e) drying the processed radish to prepare a powder; And f) preparing the powder in a liquid phase.

In addition, the present invention comprises the steps of a) extracting the radish through the aqueous solution of inorganic acid in red algae; b) removing inorganic impurities from the liquid agar; c) preparing a powder by drying the milk after the a) or a), b) step; d) preparing the powder in a liquid phase; e) bleaching with an oxidizing agent in the liquid phase and adjusting the viscosity; And f) preparing a paper surface size agent by adding at least one drug selected from a viscosity modifier and a size agent to the bleached, viscosity-adjusted liquid radish.

Specific steps are described below.

1. Raw material

Red algae inhabit relatively deeper water than other algae, and are relatively small in size. Red algae that are widely used as raw materials of daikon radish include wormwood, daikon radish, buckwheat, pods, thorny radish, silk grass, edamame, stone fern, stone and Jinuari. Daikon consists of agarose and agarose. Agarose, a neutral polysaccharide, has a strong gelling property to increase its strength. Acidic polysaccharides, agalopectin, have weak gelation and viscoelasticity and water retention, and the aqueous solution of the radish extracted from red algae is stronger than any other gelling agent. Show characteristics. The aqueous solution of daikon forms gel at 20 ~ 40 ℃, and once formed gel does not melt at 60 ℃ or below, and even if gelation and dissolution are repeated, the original gel characteristics are almost unchanged.

As a raw material in the present invention, the red algae is characterized in that at least one selected from the group consisting of Locust spruce tree, Dolphin spree, Gambling tree or Noodle sprout tree. Includes all red algae where minimal fibers are present.

2. Extraction Process of Red Algae

In addition, the step of extracting the radish through the inorganic acid aqueous solvent in the red algae comprises extracting red algae for 50 ~ 140 ℃, 30 minutes ~ 3 hours using the inorganic acid aqueous solvent. The inorganic acid aqueous solution may be prepared by extracting to pH 1-5 with sulfuric acid, phosphoric acid, nitric acid or hydrochloric acid.

The red alga is immersed in the extraction solution for a certain time. At this time, the radish component is extracted from the skin of the red algae with the extraction solvent. At this time, the extraction solution is extracted by producing an acidic solution of pH 1-5 with sulfuric acid, phosphoric acid, nitric acid or hydrochloric acid aqueous solution. Since the melting point of the radish is about 60 ℃, the temperature of the extraction solvent is preferably heated to 60 ℃ or more.

3. Processing of Daikon

The step of preparing the powder by drying the extracted daikon comprises drying using a hot air dryer or a vacuum dryer to prepare a powder containing 1 to 50% by weight of water.

The extracted milk liquid may be dried immediately in a state of a powder of about 10 to 20% by weight in a powder of milk, or the milk powder may be immediately processed without drying the extracted milk liquid in a powder form after being processed into a surface sizing agent. It may also be dried. Immediately after extraction, the dried radish is transported and bleached with oxidant and viscosity controlled in a separate place. When the oxidant treatment is complete, it is dried in powder form.

At this time, it is preferable that the dryer for drying the radish is dried at a temperature of 50 ° C. or more using a hot air dryer or a vacuum dryer. However, care should be taken because the discoloration may occur when dried at an excessively high temperature.

4. Surface Sizing Liquid Manufacturing

The step of preparing the powder in the liquid phase includes preparing in a liquid phase having a solid content of 2 to 50% by weight.

The milk powder is prepared in a solid solution of 2 to 50% by weight and oxidized bleached to produce whiteness and viscosity that can be sized. In the present invention, the oxidative bleaching reaction refers to a process of satisfying the whiteness requirement of the radish through other chemical treatments, and refers to a process of decomposing the viscosity to be suitable for the surface sizing process, and injecting an oxidizing agent and a viscosity controlling agent into the slurry. It is made to react. In order to improve the oxidation efficiency, the oxidation reaction may be carried out in the presence of a metal catalyst if necessary.

The oxidant includes ozone, peracetic acid, potassium permanganate, sodium hypochlorite, chlorine dioxide or hydrogen peroxide.

In the present invention, the oxidizing agent refers to a substance used to oxidize the radish extracted from red algae to obtain the required whiteness and sufficiently low viscosity, and to use an oxidizing agent such as hydrogen peroxide, peracetic acid, potassium permanganate, ozone, sodium hypochlorite, chlorine dioxide, etc. Can be.

Bleaching using the oxidizing agent, and adjusting the viscosity is characterized in that the viscosity of the solution is hydrolyzed into a solution having a viscosity of 5 ~ 50 cps (50 ℃ standard).

The solution viscosity, which can be sized, is 5 to 30 cps (at 50 ° C) and the oxidation is completed when the required viscosity is reached. In this case, a reaction stopper may be used so that no further oxidation reaction occurs after the reaction is completed. As the reaction stopper, sodium metabisulfite, peroxide, peroxide trapping agent, or the like may be used.

In addition, the present invention includes a white paper, heavy paper, pulp paper, art paper, coated paper, kraft paper, photosensitive paper, carbon paper, mermaid paper, drawing paper or toilet paper using the paper surface size agent produced by the paper surface size agent manufacturing method We include paper to say.

In addition, the present invention includes a method for producing paper using the paper surface size agent produced by the paper surface size agent manufacturing method. The paper manufacturing method using the said surface sizing agent is a method of manufacturing paper through the beating, sorting, selection, papermaking, and processing processes which are common paper manufacturing methods. If paper is manufactured by adding the paper surface sizing agent without using a starch sizing agent in the papermaking process, an inexpensive paper having improved printability can be produced.

As described above, the manufacturing method of the paper surface size agent using the radish extracted from red algae according to the present invention by using the radish extracted from red algae as a paper surface size agent, compared to the surface size agent of the conventional starch system The increase is similar, but has the effect of improving the printability and opacity, and has the advantage of producing an inexpensive product compared to paper using a starch surface size agent.

Hereinafter, the present invention will be described in detail by way of examples.

However, the following examples are illustrative of the present invention, and the contents of the present invention are not limited by the following examples. All percentages, parts, etc., are in weight units based on the weight of dry pulp unless otherwise noted.

Example  One

Red alga was extracted for 1 hour at a water solvent temperature of 100 ° C. in the presence of an inorganic acid, and the extract was dried at a temperature of 50 ° C. using a vacuum dryer, and then prepared into a powder form. The moisture of the powder is 12 ± 2% by weight. The powder was prepared in a liquid phase having a solid content of 10% by weight at a temperature of 80 ° C. or higher. The pH of the liquid phase is 7 ± 0.5. The liquid phase was prepared with a surface sizing agent having a viscosity of 15 cps (at 50 ° C.) suitable for surface sizing at the same time as ozone (O ₃ ).

The coating amount of the surface size liquid using the radish was adjusted to 4 ± 1 g / m ² so that the coating bar No. Sizing was carried out at 12. After surface sizing, it was dried in a drum dryer at 120 ° C, and the dried specimen was 23 ± 1 ° C, relative to the Technical Association of pulp & paper lndustry (TAPPI standard) T402 om-88. Relative humidity (RH) Humidity treatment was performed for at least 24 hours under constant temperature and humidity conditions controlled to 50 ± 2%.

Example  2

Red alga was extracted for 1 hour at a water solvent temperature of 100 ° C. in the presence of an inorganic acid, and the extract was dried at a temperature of 50 ° C. using a vacuum dryer, and then prepared into a powder form. The moisture of the powder is 12 ± 2% by weight. The powder was prepared in a liquid phase having a solid content of 10% by weight at a temperature of 80 ° C. or higher. The pH of the liquid phase is 7 ± 0.5. The liquid phase was prepared with a surface sizing agent having a viscosity of 13 ± 2 cps (at 50 ° C.) suitable for surface sizing at the same time as ozone (O ₃ ).

The coating amount of the surface sizing agent using radish was adjusted to 4 ± 1 g / m ² , and the coating bar No. Sizing was carried out at 16. After surface sizing, the resultant was dried in a Drum Dryer at 120 ° C., and the dried specimens were subjected to humidity treatment for 24 hours or more at a constant temperature and humidity condition of 23 ± 1 ° C. and RH 50 ± 2% according to TAPPI standard T402 om-88.

Comparative example  One

Paper (paper) without surface size treatment was used.

Comparative example  2 to 5

Using a corn starch and tapioca oxidized starch received from E Company, a dispersion having a solid content of 10% by weight was dehydrated at a temperature of 90 ° C. or higher for 30 minutes, and the characteristics thereof are shown in Table 1 below. It was applied to paper, dried, and humidified in the same manner as in the above example.

characteristic Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Raw material corn corn tapioca tapioca Coating Bar No. 12 16 12 16 Moisture (%) 12 ± 2 12 ± 2 12 ± 2 12 ± 2 PH (pH) (10% conc. Sol.) 7 ± 0.5 7 ± 0.5 7 ± 0.5 7 ± 0.5 Brookfield Viscosity
Brookfield viscosity (at 50 ° C, 10% conc. Sol., Cps) 8 ± 2 8 ± 2 12 ± 3 12 ± 3

Experimental Example  One

As a result of the surface sizing, the properties of each Example and Comparative Examples are shown in Table 2 below.

division ingredient Basis weight
(g / m ² ) Density
(g / cc) Pickup Weight
(g / m ² ) Example 1 Agar coated bar 12 93.25 0.84 6.25 Example 2 Agar coated bar 16 91.63 0.83 4.63 Comparative Example 1 No surface size 87 0.74 0 Comparative Example 2 Starch Coating Bar 12 90.86 0.83 3.86 Comparative Example 3 Starch Coating Bar 16 90.92 0.84 3.92 Comparative Example 4 Tapioca coated bar 12 90.42 0.82 3.42 Comparative Example 5 Tapioca coated bar 16 91.09 0.84 4.09

The surface was observed under a scanning electron microscope (XL30ESEM) of Philips to determine the film formation state on the paper surface of the surface sizing agent. The scanning electron microscope observation result of the paper surface is shown in FIG. As shown in FIG. 1, corn oxidized starch, tapioca oxidized starch, and radish surface sizing agent showed similar film forming states, and the higher the number of coating bars, the higher the residual amount of surface sizing agent, the better the film formation. Could. In the case of corn oxidized starch, the penetration rate in the thickness direction increased due to the relatively low viscosity, and the film forming ability on the surface of the paper was relatively decreased.

Fig. 2 shows the thermal cut-off results of the paper subjected to the surface sizing treatment with the starch oxide and radish. The specimens of the humidity-treated samples and the comparative examples were measured according to the Technical Association of pulp & paper lndustry (TAPPI standard). As shown in FIG. 2, it was found that the longitudinal and transverse thermal shortening was increased through the surface sizing treatment, and the cause was determined to be the result of the surface sizing agent penetrating into the paper to increase the bonding between the fibers.

As shown in FIG. 3, corn oxidized starch, tapioca oxidized starch, and radish were both stiffness in both the machine direction (MD) / cross direction (CD) compared to paper without surface sizing. ) Was increased. 3 is a graph showing the stiffness. Stiffness is greatly affected by the thickness of the paper and the state of the paper surface. The higher the number of coating bars, the better the stiffness. As a result, it is considered that the cause of the increase in bending strength is that the film-like residue of the surface sizing agent and a small amount of the size liquid penetrated in the thickness direction of the paper act as a reinforcing agent by increasing the bonding strength of the fibers.

The optical properties of the Examples and Comparative Examples were measured for whiteness and opacity using a Color-Touch by Technidyne based on the TAPPI standard. As shown in the graph of FIG. 4 showing the opacity measurement, it was found that the opacity of the sample subjected to the surface sizing was reduced, and the cause was that the surface sizing agent filled the pores in the paper and thus the optical contact. It was considered to be because it improves the transparency. However, the opacity of the sample treated with daikon showed little decrease in opacity, and the opacity was somewhat increased.

Experimental Example  2

The printability of Comparative Example 1, Comparative Example 4 and Example 1, which was surface sized with Comparative Example 1 without surface sizing and oxidized starch, was evaluated using a RI-tester.

Dry picking Dry Pick )

Picking during printing is caused by insufficient surface strength of the paper or too high viscosity and persistence of the ink, and picking is a problem in the printing operation due to a decrease in print quality and mixing in the ink of the paper. Dry picking is an experiment to detect the tearing of the paper surface by using an ink having a specific tack value (Industrial Pick), the ink used in the experiment was an ink having a tack value 12 and tack value 16. As shown in FIG. 5, it was confirmed that Example 1 (d) exhibited excellent characteristics in dry picking as compared to Comparative Example 2 (b) and Comparative Example 4 (c), and the surface strength of the surface sizing using the radish was excellent. I could see that. It is considered that the printing defects due to the ink speed may be reduced when the surface sizing paper using the radish is applied to the printing.

Experimental Example  3

The printability of Comparative Example 1, Comparative Example 4 and Example 1, which was surface sized with Comparative Example 1 without surface sizing and oxidized starch, was evaluated using a RI-tester.

Wet  Picking ( Wet Pick )

Wet picking is related to the water resistance of the surface to determine the tear resistance of the ink having a specific tack value after applying a certain amount of water to the surface. As a result of the experiment using the ink having the tack values 12 and 13, as shown in FIG. 6, the tearing of Example 1 (r) occurred much compared with Comparative Example 2 (b) and Comparative Example 4 (c). Could see. Wet picking is an important property in offset printing. If the water resistance of the paper surface coating layer is weak, it is highly likely to cause printing defects during printing. However, it may be easily solved by adding a certain amount of the size agent to the surface size agent.

Experimental Example  4

The printability of Comparative Example 1, Comparative Example 4 and Example 1, which was surface sized with Comparative Example 1 without surface sizing and oxidized starch, was evaluated using a RI-tester.

Ink set - With off  ink Reference

Ink Set-Off (10) experiment of Figure 7 is an experiment to determine the curing speed of the ink. When ink is applied simultaneously to Example 1, Comparative Example 2, Comparative Example 4, and Comparative Example 1 and the same time passes, it is an experiment to determine the degree of curing of the ink of each Example and Comparative Example. As shown in FIG. 7, the ink set-off of Example 1 (d) was superior to Comparative Example 2 (b) and Comparative Example 4 (c) through this experiment. In addition, it is believed that the use of radish rather than surface sizing using starch oxide or tapioca will cause less printing defects, such as buring in the printing process. In the ink repellence (20) of Figure 7, it can be seen that Example 1 (d) is superior to Comparative Example 2 (b) and Comparative Example 4 (c), the ink during printing from the plate surface to the paper It is considered that the reproduction of printed matter is excellent because of the easy transition.

Experimental Example  5

The printability of Comparative Example 1, Comparative Example 4 and Example 1, which was surface sized with Comparative Example 1 without surface sizing and oxidized starch, was evaluated using a RI-tester.

2- color  Trapping (2- color trapping )

Trapping means that the previously printed ink layer is well receptive to the ink printed later in multicolor printing. In the trapping experiment as shown in FIG. 8, first, yellow ink was transferred to a sample, and then blue ink was printed to examine ink repairability of each sample through green clarity. Compared with the sample of starch oxide or tapioca, it was found that the green color of the sample treated with radish was particularly vivid.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a photograph of the surface size of the surface size measured by SEM according to the present invention.

Figure 2 is a graph of the thermal shortening test results of the surface sized paper according to the present invention.

3 is a graph showing the stiffness test results of the surface sized paper according to the present invention.

Figure 4 is a graph of the opacity test results of the surface sized paper according to the present invention.

5 is a photograph showing a dry picking test result of the surface sized paper according to the present invention.

Figure 6 is a photograph showing the results of the wet picking of the surface sized paper according to the present invention.

Figure 7 is a photograph showing the results of the ink set-off experiment of the surface sized paper according to the present invention.

8 is a photograph showing the results of a two-color trapping experiment of the surface sized paper according to the present invention.

Claims (11)

a) extracting radish from the red algae through an aqueous solution of inorganic acid; b) removing inorganic impurities from the liquid agar; c) bleaching the liquid radish from which the impurities have been removed using an oxidizing agent and adjusting the viscosity; d) adding at least one drug selected from a viscosity modifier and a size agent to the bleached, viscosity-adjusted liquid radish; e) drying the processed radish to prepare a powder; And f) preparing the powder in a liquid phase. a) extracting radish from the red algae through an aqueous solution of inorganic acid; b) removing inorganic impurities from the liquid agar; c) preparing a powder by drying the milk after the a) or a), b) step; d) preparing the powder in a liquid phase; e) bleaching with an oxidizing agent in the liquid phase and adjusting the viscosity; And f) preparing a paper surface size agent by adding at least one drug selected from a viscosity modifier and a sizing agent to the bleached, viscosity-adjusted liquid radish; Manufacturing method. According to claim 1 or 2, wherein the red algae is at least one selected from the group consisting of Locust spruce tree, Dolphin spree, Gambling tree, or Noodle sprouts tree. Manufacturing method. According to claim 1 or 2, wherein the step of extracting the radish through the inorganic acid aqueous solvent in the red algae red algae characterized in that the extraction of red algae using an aqueous inorganic acid solution solvent for 50 ~ 140 ℃, 30 minutes ~ 3 hours Method for preparing a paper surface sizing agent using a radish extracted from. 5. The method of claim 4, wherein the aqueous inorganic acid solution is prepared by extracting sulfuric acid, phosphoric acid, nitric acid, or hydrochloric acid at a pH of 1 to 5. 6. The method of claim 1 or 2, wherein the step of drying the daikon to prepare a powder is characterized in that it is dried using a hot air dryer or a vacuum dryer to prepare a powder containing 1 to 50% by weight of moisture. Manufacturing method of paper surface sizing agent using radish extracted from red algae. The method of claim 1 or 2, wherein the step of preparing the powder in the liquid phase is a method for producing a paper surface size agent using a radish extracted from red algae, characterized in that the liquid phase having a solid content of 2 to 50% by weight. . The method of claim 1 or 2, wherein the oxidizing agent is ozone, peracetic acid, potassium permanganate, sodium hypochlorite, chlorine dioxide or hydrogen peroxide. The method of claim 1 or 2, wherein the step of bleaching using the oxidizing agent, adjusting the viscosity is characterized in that the hydrolysis of the solution to a solution having a viscosity of 5 ~ 50 cps (50 ℃) Manufacturing method of paper surface sizing agent using radish extracted from red algae. White paper, heavy paper, pulp paper, art paper, coated paper, kraft paper, photosensitive paper, carbon paper, mermaid paper, drawing paper using the paper surface size agent produced by the method for producing a paper surface size agent according to claim 1 or 2 Paper containing toilet paper. A method of producing paper using a paper surface sizing agent produced by the method for producing a paper surface sizing agent according to claim 1.

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