KR101364533B1 - Additive for reducing the amount of pulp - Google Patents

Abstract

A method for manufacturing an additive for reducing use amount of pulp according to the present invention comprises: an emulsion manufacturing step which obtains mono, difatty acid-triethanolamine having 95% of purity by removing unreacted triethanolamine using an organic solvent after mixing fatty acids and triethanolamine with a mole fraction of 1:1 to 1.2:1 ratio and performing ester reaction; an emulsion polymerization step which urethane reacts the mono, difatty acid-triethanolamine and diisocianate composition at 60 to 80 °C in order to convert the emulsion into polymer; and a neutralization step which neutralizes the polymerized emulsion into acetic acid by the urethane reaction. If the additive for reducing use amount of pulp is used, paper volume can be increased by using a small amount and light and thick papers can be manufactured. In addition, the additive for reducing use amount of pulp increases paper volume, is not drastically reduces tensile strength of the paper, and obtains storage safety of the additive.

Description

Additive for reducing the amount of pulp {Additive for reducing the amount of pulp}

The present invention relates to an additive for reducing the amount of pulp, and more particularly, it is possible to improve the volume of paper while reducing the amount of pulp used, without significantly reducing the tensile strength of the paper, and to secure the storage safety of the additive. The present invention relates to an additive for reducing the amount of pulp used.

Today, domestic paper makers are responding by lowering the proportion of natural pulp or increasing the proportion of recycled pulp as the cost of manufacturing increases due to the taxation of carbon and skyrocketing natural pulp prices. However, simply lowering the basis weight (in grams of paper 1 m2) or increasing the specific gravity of the recycled pulp causes the paper to become thinner, resulting in a decrease in opacity and poor printability. In addition, there is a problem that the whiteness of the paper also decreases as the specific gravity of the recycled pulp increases. Since printability and opacity are closely related to the thickness of paper, paper has been manufactured by selecting and using pulp whose volume has been improved so far to satisfy the quality required by the end user.

In Japan, a variety of pulp volume improvers have been developed and used. As the use of recycled pulp increases as well as the volume improvers of natural pulp, the development of volume improvers for regenerated pulp is also active. The paper produced is also being expanded to almost all papers such as uncoated (non-coated) heavy paper, uncoated high-quality paper, heavy coated paper (coated paper), fine coated paper, cast-coated paper, and the like.

In addition, the types of volume improvers to be developed include inorganic fillers such as hard calcium carbonate and white carbon (silica), and volume improvers of organic series such as alkyl esters, alkyl amides, and cationic surfactants. In addition, sizing agents and the like have also been developed (Japanese Patent Laid-Open Nos. 2002-115199 and 2001-248100).

In Korea, some high-volume manga paper is being manufactured for specially-planned products of uncoated heavy paper, and recently, some paper makers are testing volume improvers for reducing natural pulp, but the volume improver under test depends on imports. I'm doing it. In addition, the application of the volume improver for the recycled pulp is limited to the application of the de-inking (ink removal) facilities, etc., but the use of recycled pulp is expected to increase in the future, so the development of recycled pulp volume improver is very necessary.

Looking at the related technology patented in Korea, in Korea Patent Nos. 10-994091 and 10-0989538, cationic starch and vinyl-based polymer to improve the volume and tensile strength, but the volume improvement is There are inadequate disadvantages.

In addition, Korean Patent No. 10-1111458 provides an additive composition for paper containing an amide compound obtained by reacting a carboxylic acid with a specific amine or a salt thereof. The production cost is high and biodegradability is achieved by using a specific amine. There is a disadvantage.

In addition, Korean Patent No. 10-0676267 introduces a cationic surfactant that is quaternized by ester-reacting fatty acids with triethanolamine, but has a volume improvement effect of pulp, but has a disadvantage in that the water resistance is lowered.

[Document 1] Japanese Unexamined Patent Publication No. 2002-115199 "Paper additives" (published Apr. 19, 2002) [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-248100 "Patent Lipid Enhancer" (published Sep. 14, 2001) Patent Document No. 10-994091 "Paper Quality Enhancer" (registered Nov. 2010) [Patent 4] Patent No. 10-0989538, "Paper Quality Enhancer" (2010. 10. 18. registration) [Patent 5] Registered Patent No. 10-1111458 "Paper Additive Composition and Manufacturing Method of Paper Using The Same" (January 26, 2012) [Patent 6] Registered Patent No. 10-0676267 "Method for Producing Cationic Surfactant" (January 24, 2007).

The present invention is to solve the above problems of the prior art, it is excellent in improving the volume of the paper even in small amounts, do not significantly reduce the tensile strength of the paper, reducing the amount of pulp used to secure the storage safety of the additive An object of the present invention is to provide an additive and a method of manufacturing paper using the same.

In the method for preparing an additive for reducing the amount of pulp used according to the present invention, an ester reaction is carried out by mixing a fatty acid and triethanolamine in a molar ratio of 1: 1 to 1.2: 1. Preparing an emulsifier to obtain at least% mono, di fatty acid-triethanolamine; Polymerizing the emulsifier to convert the emulsifier into a polymer by performing a urethane reaction between the mono, di fatty acid-triethanolamine and the diisocyanate component at 60 ° C. to 80 ° C .; And neutralizing the emulsifier polymerized by the urethane reaction with acetic acid.

The fatty acid may be any one selected from palmitic acid, stearic acid, oleic acid and linoleic acid, and the diisocyanate component may be any one selected from toluene diisocyanate, 1.6-hexamethylene diisocyanate and isophorone diisocyanate. Can be.

In addition, the additive for reducing the amount of pulp may be characterized in that the active ingredient is made of an emulsion of 10% to 30% by adding ion-exchanged water.

The additive for reducing the amount of pulp according to the present invention may be characterized in that the additive for reducing the amount of pulp produced by the production method. .

In manufacturing paper using the additive for reducing the amount of pulp used according to the present invention, the additive may be used by mixing 0.1 to 2.0 parts by weight with respect to 100 parts by weight of the pulp raw material.

When using the additive for reducing the amount of pulp according to the present invention, even if a small amount can be used to improve the volume of the paper and there is an effect that can be produced light and thick paper.

In addition, the additive for reducing the amount of pulp according to the present invention does not significantly reduce the tensile strength of the paper while improving the volume of the paper, it is effective to ensure the storage safety of the additive.

The present invention obtains an emulsifier by esterifying a fatty acid with triethanolamine, and chemically polymerizes the emulsifier to maintain the tensile strength of the paper as a volume improver when added to the pulp.

In the method for preparing an additive for reducing the amount of pulp used according to the present invention, an ester reaction is carried out by mixing a fatty acid and triethanolamine in a mole ratio of 1: 1 to 1.2: 1, and then reacting an unreacted triethanolamine with an organic solvent. A step of preparing an emulsifier to remove the mono, di fatty acid-triethanolamine having a purity of 95% or more, and the mono, di fatty acid-triethanolamine and the diisocyanate component are urethane reacted at 60 ° C. to 80 ° C. to convert the emulsifier into a polymer. And polymerizing the emulsifier to neutralize the emulsifier polymerized by the urethane reaction with acetic acid.

The fatty acid refers to a monovalent carboxylic acid having one carboxy group (-COOH) in the hydrocarbon chain. Fatty acid molecules are composed of hydrocarbon chains, which are linked to the backbone of carbon by hydrogen, with a carboxyl group attached to one end. Most fatty acids in nature are even-numbered carbon atoms, and the number of carbon atoms is eight or more.

The fatty acid can be divided into saturated fatty acid and unsaturated fatty acid. In general, saturated fatty acids have a carbon-to-carbon single bond and exist in solid form at room temperature, while unsaturated fatty acids contain carbon-to-carbon double bonds in the basic skeleton of carbon. It is in the form of a liquid at room temperature. In this respect, liquids are generally considered to be unsaturated fatty acids and solids to saturated fatty acids, but lower saturated fatty acids are also present in the form of liquids. The saturated fatty acid may include palmitic acid and stearic acid, and the unsaturated fatty acid may include oleic acid and linoleic acid.

The triethanolamine is a reaction of ammonia water and ethylene oxide (Ethylene oxide) in a liquid phase at a high pressure and an elevated temperature in a suitable ethanolamine mixture including monoethanolamine], diethanolamine and triethanolamine as a main component in a suitable reactor It can be prepared by deriving.

Typically, when the ester reaction of fatty acid and triethanolamine leaves some unreacted material, an organic solvent can be used to remove the unreacted material. The organic solvent removes the triethanolamine component remaining in the reactant while causing the ester reaction between the fatty acid and triethanolamine. As the organic solvent, it is preferable to use hexane (Hexane), heptane, Octane, Nonane, Decane, etc., in which triethanolamine is not dissolved. The compound which completed the ester reaction has the property as an emulsifier.

The present invention further performs a step of chemically polymerizing the fatty acid-triethanolamine compound. There are various methods of polymerizing the emulsifier compound, but in the present invention, a urethane reaction is applied.

In the present invention, the mono, di fatty acid-triethanolamine having a purity of 95% or more is subjected to a urethane reaction with a diisocyanate component. The urethane reaction is carried out at 60 ℃ to 80 ℃, after the urethane reaction is neutralized with acetic acid (Acetic acid) to obtain a final product. As the diisocyanate component, toluene diisocyanate, 1.6-hexamethylene diisocyanate, isophorone diisocyanate or the like is preferably used.

In the present invention, it is preferable to neutralize the polymerized emulsifier with acetic acid in the polymerization step of the emulsifier.

The additive for reducing the amount of pulp obtained by performing as described above is preferably made of an emulsion having an active ingredient of 10% to 30% by adding ion-exchanged water. This additive becomes a solid phase when the active ingredient is 100%, so that the ion-exchanged water is added to make the liquid phase of the active ingredient 10% to 30% to facilitate the handling of workers and to ensure storage stability over time. For sake.

In addition, when manufacturing the paper using the additive for reducing the amount of pulp used, it is preferable to use 0.1 to 2.0 parts by weight of the additive with respect to 100 parts by weight of the pulp raw material. It is more preferable to use 0.5 parts by weight, the use of less than 0.1 parts by weight is difficult to express the performance of the additive, and when used in excess of 2.0 parts by weight of the paper is greatly reduced the tensile strength is not preferable.

In the present invention, pulp production, paper production, paper bulk measurement, paper tensile strength measurement, and additive storage stability measurement are performed as follows.

(1) Preparation of Pulp

Pulp raw material for paper production is obtained through the following process.

① Dissociate 10 liters of tap water + 150 g of LBKP (Leaf Bleached Kraft Pulp) for 20 minutes in a mixer to obtain a 1.5% pulp slurry.

② Put the above pulp slurry into Valley beater (DM-822, Daeil Pore) and beat for 15 minutes.

③ Use the Freedom Tester (Canadian Freeness Tester) to confirm that the freeness is between 400 CSF and 450 CSF.

④ 500 g of tap water is added to 500 g of 1.5 wt% LBKP pulp slurry diluted with tap water, followed by dilution. 60% of heavy calcium carbonate 2.7 g, 20% of AKD (Alkyl Ketene Dimer) 0.11 g, 0.2% of Cpolymer 1.13 g, 3% bentonite 0.7g was added and stirred.

(2) manufacture of paper

Paper is manufactured by the following process using the pulp raw material prepared above.

① The above paper pulp raw material is papered to a basis weight of about 80 g / m 2 by a sheet machine (Square sheet machine).

② Press twice for 30 seconds at 0.35MPa with a sheet press.

③ Dry at 120 ° C for 60 seconds with a drum dryer to obtain paper having a width of 30cm × 30cm.

④ Determine the density of the paper by measuring the weight and thickness of the paper obtained (the smaller the density, the larger the volume).

Density (g / cm 3) = Basis weight (g / m 2) / Thickness (mm) × 0.001

(3) Measurement of bulk property of paper

If the density of the paper is calculated for the manufactured paper, and then the density of the paper is calculated as the inverse, the volume (capacity) per unit weight of the paper can be calculated.

When the capacity of the paper sheet without an additive is 100, the inverse of the density of the paper sheet when the additive for reducing the pulp consumption according to the present invention is used, and the inverse of the paper sheet without the additive is used. By calculating the capacity, the ratio of the relative capacity of the paper using the additive according to the present invention can be calculated, and this ratio can be expressed as a specific volume (Volume index).

(4) Measurement of tensile strength of paper

The tensile strength of the paper is made from the specimen and the specimen is measured by the tensile tester as follows.

① Cut the paper to 25 mm x 200 mm to obtain a test piece.

(2) Insert the obtained test piece into a tensile compression tester (BMSTP-100P, BMS tech), and operate the tensile compression tester to measure the tensile force of the paper.

③ Using the measured value, calculate the tensile strength according to the following formula.

Tensile Strength (kN / m) = {Tensile Force (kgf) × 9.81} / {1,000 × Width of Test Specimen}

(5) Measurement of storage stability of additive

The storage stability of the additive according to the present invention is measured according to the following procedure.

① Take 1,000g of the additive and put it in 50 ℃ thermostat and keep it for 1 month.

② After one month, open the thermostat and take out the stored additives and observe them with the naked eye.

③ As a result of observation, if the emulsion is separated or solidified, it is evaluated as "bad" storage. If it is not separated, it is still evaluated as "good".

Hereinafter, the present invention will be described in detail through specific examples and experimental examples.

<Example A>

83.5 kg of triethanolamine and 14.9 kg of industrial stearic acid were injected into a 200 liter stirrer and a pilot capable of vacuum topping, and then 1 kg of para-toluenesulfonic acid, an acid catalyst, was injected and mixed. The water produced in the reactants was removed by vacuum topping while raising the reactants to 140 ° C. under a nitrogen atmosphere. Nitrogen was vented into the bottoms to speed up the reaction while maintaining the color of the reactants. The reaction was carried out for 20 hours, the reaction was terminated at an acid value of 3.0 or less, and cooled to obtain about 98 kg of a solid content.

1,800 g of the ester compound produced by the above ester reaction was taken, and 396 g of an octane solvent was added thereto, and the mixture was allowed to stand for 20 hours in a constant temperature bath at 110 ° C. Thereafter, 1,420 g of the lower layer was separated from the reaction, and 776 g of mono, di fatty acid-triethanolamine of 80% or more was obtained in the upper layer.

Thereafter, 5 g of acetic acid corresponding to 1 mol of triethanolamine was added thereto, and the mixture was left at 60 ° C for 1 hour to separate 28 g of the lower separation solution, and 720 g of the remaining upper layer was vacuum-topped to give 350 g of 95% or more mono and di fatty acid-triethanolamine. Got it.

&Lt; Example 1 >

100 g of the ester compound obtained in Example A was heated to 60 ° C, 13.8 g of acetic acid (molar amount corresponding to the amine number) was added thereto, mixed uniformly, and 900 g of ion-exchanged water was added dropwise for 30 minutes while cooling naturally. After uniformly dispersing, 1,000 g of an emulsion having an active ingredient of 10% was obtained.

<Example 2>

100 g of the ester compound obtained in Example A and 35.3 g of toluene diisocyanate were mixed in a 5: 4 molar ratio, followed by a urethane reaction at 80 ° C. for 30 minutes, neutralized with 13.8 g of acetic acid, and then 1,210 g of ion-exchanged water was added dropwise for 30 minutes while cooling naturally. 1350 g of 10% emulsion was obtained.

<Example 3>

100 g of the ester compound obtained in Example A and 21.3 g of 1.6-hexamethylene diisocyanate were mixed in a 2: 1 molar ratio to give a urethane reaction at 60 ° C. for 60 minutes, neutralized with 13.8 g of acetic acid, and then 1,080 g of ion-exchanged water was naturally cooled. Dropwise addition for 30 minutes yielded 1,210 g of 10% emulsion.

<Example 4>

17.4 g of toluene diisocyanate and 100 g of polypropylene glycol (weight average molecular weight 2,000) were mixed in a 2: 1 molar ratio to give a urethane reaction at 80 ° C. for 60 minutes, and 29.4 g of 39.4 g of the ester compound obtained in Example A were obtained. After injection, the reaction was urethane reaction for 60 minutes at 80 ° C. for 2 minutes, neutralized with 6 g of acetic acid, and 1,400 g of ion-exchanged water was added dropwise for 30 minutes while cooling naturally to obtain 1,550 g of 10% emulsion.

&Lt; Example 5 >

100 g of the ester compound obtained in Example A and 29.4 g of toluene diisocyanate were mixed in a 2: 1 molar ratio to give a urethane reaction at 80 ° C. for 30 minutes, neutralized with 13.8 g of acetic acid, and then 1,150 g of ion-exchanged water was added dropwise for 30 minutes while cooling naturally. 1,290 g of 10% emulsion was obtained.

<Example 6>

100 g of partially saponified polyvinyl alcohol (weight average molecular weight 50,000) 10% aqueous solution was mixed with 500 g of the emulsion obtained in Example 1 to obtain 600 g of emulsion.

&Lt; Comparative Example 1 &

Into a four-necked flask equipped with a stirrer, a thermometer, and a vacuum apparatus, 340.8 g (1.2 mol) of industrial stearic acid and 149 g (1 mol) of triethanolamine were injected and mixed in a nitrogen atmosphere. 2 g of paratoluenesulfonic acid, which is an acidic catalyst, was added thereto, the temperature was raised to 140 ° C., and an ester reaction was carried out under nitrogen aeration to obtain 465 g of a reactant. The acid value after the ester reaction was 3.0 or less. 13.8 g of acetic acid (molar amount corresponding to the amine number) was added to 100 g of the reaction product, and then uniformly mixed, 900 g of ion-exchanged water was added and uniformly dispersed to obtain 1,000 g of an emulsion having an active ingredient of 10%.

Comparative Example 2

In order to comparatively evaluate the effect of the additive for reducing the amount of pulp used in the present invention, N company's products which are commercially available as pulp reducing agents in Korea were selected as comparative examples. Although the product of N company is commercially available in Korea, its manufacturing method is not disclosed to the public, and thus the manufacturing method thereof cannot be described in detail, but the product is compared by using the product under the same conditions as the additive for reducing the amount of pulp used in the present invention. It was made into the object of evaluation.

<Experimental Example 1-1>

0.5 parts by weight of the additive prepared in Example 1 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.620 g / cm 3 and the tensile strength was 2.6 kN / m.

<Experimental Example 1-2>

0.75 parts by weight of the additive prepared in Example 1 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.614 g / cm 3 and the tensile strength was 2.3 kN / m.

Experimental Example 2-1

0.5 parts by weight of the additive prepared in Example 2 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.632 g / cm 3 and the tensile strength was 3.3 kN / m.

Experimental Example 2-2

0.75 parts by weight of the additive prepared in Example 2 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.632 g / cm 3 and the tensile strength was 3.2 kN / m.

<Experimental Example 3-1>

0.5 parts by weight of the additive prepared in Example 3 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.620 g / cm 3 and the tensile strength was 2.8 kN / m.

<Experimental Example 3-2>

0.75 parts by weight of the additive prepared in Example 3 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.614 g / cm 3 and the tensile strength was 2.6 kN / m.

<Experimental Example 4-1>

0.5 parts by weight of the additive prepared in Example 4 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.620 g / cm 3 and the tensile strength was 3.2 kN / m.

<Experimental Example 4-2>

0.75 parts by weight of the additive prepared in Example 4 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.614 g / cm 3 and the tensile strength was 2.9 kN / m.

Experimental Example 5-1

0.5 parts by weight of the additive prepared in Example 5 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.620 g / cm 3 and the tensile strength was 3.0 kN / m.

Experimental Example 5-2

0.75 parts by weight of the additive prepared in Example 5 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.608 g / cm 3 and the tensile strength was 2.7 kN / m.

Experimental Example 6-1

0.5 parts by weight of the additive prepared in Example 6 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.603 g / cm 3 and the tensile strength was 2.7 kN / m.

Experimental Example 6-2

0.75 parts by weight of the additive prepared in Example 6 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.592 g / cm 3 and the tensile strength was 2.5 kN / m.

Comparative Experiment (Blank)

Paper was prepared according to the above paper production method without adding an additive. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.651 g / cm 3 and the tensile strength was 3.3 kN / m.

Comparative Example 1-1

0.5 parts by weight of the additive prepared in Comparative Example 1 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.620 g / cm 3 and the tensile strength was 2.6 kN / m.

Comparative Example 1-2

0.75 parts by weight of the additive prepared in Comparative Example 1 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was prepared according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.620 g / cm 3 and the tensile strength was 2.4 kN / m.

Comparative Example 2-1

0.5 weight part of the additive of the comparative example 2 was uniformly mixed with 100 weight part of said pulp for paper manufacture, and paper was manufactured according to the said paper manufacturing method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.638 g / cm 3 and the tensile strength was 2.9 kN / m.

Comparative Example 2-2

0.75 parts by weight of the additive of Comparative Example 2 was uniformly mixed with 100 parts by weight of the pulp for paper production, and paper was produced according to the above paper production method. The density and the tensile strength were measured by measuring the weight and thickness of the manufactured paper. The density was 0.626 g / cm 3 and the tensile strength was 2.6 kN / m.

The results of the Experimental Example and Comparative Experimental Example are summarized in Table 1 below.

* Part by weight of additives mixed in 100 parts by weight of pulp material.

According to the results of the experimental example and the comparative example, when using the additive according to the present invention, when the 0.5 or 7.5 parts by weight of the additive with respect to 100 parts by weight of pulp raw material, the bulk property is generally improved by 5% to 10% It was found that the tensile strength of the paper was generally 80% to 100% when no additives were used, so there was no problem as the tensile strength of the paper, and the tensile strength of the paper was higher than that of Comparative Examples 1 and 2. Was found to be better. In addition, the additive according to the present invention was found to have good storage stability in all Examples.

Claims (5)

Preparation of an emulsifier to obtain mono, di fatty acid-triethanolamine with a purity of 95% or more by mixing an fatty acid with a triethanolamine in a molar ratio of 1: 1 to 1.2: 1 and then removing the unreacted triethanolamine with an organic solvent. step;
Polymerizing the emulsifier to convert the emulsifier into a polymer by performing a urethane reaction between the mono, di fatty acid-triethanolamine and the diisocyanate component at 60 ° C. to 80 ° C .; And
Neutralizing the emulsifier polymerized by the urethane reaction with acetic acid; a method for producing an additive for reducing the amount of pulp used, comprising: a.
The method of claim 1,
The fatty acid is any one selected from palmitic acid, stearic acid, oleic acid and linoleic acid,
The diisocyanate component is any one selected from toluene diisocyanate, 1.6-hexamethylene diisocyanate, isophorone diisocyanate, the method for producing an additive for reducing the amount of pulp used.
3. The method according to claim 1 or 2,
The additive for reducing the amount of pulp used is a method for producing an additive for reducing the amount of pulp used, characterized in that the active ingredient is added to the emulsion of 10% to 30% by adding ion-exchanged water.
An additive for reducing the amount of pulp produced by the manufacturing method of claim 3.
In preparing paper using the additive of claim 4,
Method for producing paper, characterized in that to use 0.1 to 2.0 parts by weight of the additive with respect to 100 parts by weight of pulp raw material.