JP4748794B2 - Pitch control agent and pitch control method - Google Patents

Description

  The present invention relates to a pitch control agent and a pitch control method for suppressing and preventing pitch failure in a paper pulp manufacturing process.

  The pitch in the pulp and paper manufacturing process is a water-insoluble adhesive mainly composed of natural resins and gums released from wood, pulp or paper, and organic substances such as various additive chemicals used in pulp and papermaking processes. It is a substance. These pitches are dispersed in a colloidal form in the pulp slurry, but it is thought that the colloidal state is destroyed and agglomerated and enlarged due to large shearing force, rapid pH change, addition of sulfuric acid band, etc. Yes. When agglomerating and enlarging, the adhesiveness not only adheres to manufacturing equipment such as fan pumps, flow pipes, chests, wires, felts, rolls, etc. Adhesion causes a deterioration in productivity and workability, such as a decrease in paper quality such as a stain or a defect of the paper, and a cause of paper breakage. In recent years, chemicals used due to diversification of paper have also diversified, and in the process, water circulation and reuse has been promoted, and pitch obstacles have increased and become complicated.

  Various methods have been proposed and implemented as a method for suppressing and preventing pitch disturbance. For example, in a method of adding a porous inorganic material such as talc or clay (see, for example, Patent Documents 1 and 2), the porous inorganic material loses the adhesiveness of the pitch, and the pitch is made into paper. In addition, there are problems that may cause contamination of process water, sludge accumulation, wire wear and damage. In addition, in the method of adding a surfactant or an anionic polymer to disperse the pitch particles to prevent aggregation and agglomeration (see, for example, Patent Documents 3 to 5), a short-term effect is recognized. If the amount of pitch in the water increases as water circulation and reuse proceeds, the effect is limited and a sudden pitch failure may occur. In addition, a method of using polyvinyl alcohol having a saponification degree of 70 to 80 mol% as a pitch dispersant (see, for example, Patent Document 6), and depositing pitch by using polyvinyl alcohol having a saponification degree of 50 to 100 mol% and high molecular weight gelatin in combination. Method of suppressing (for example, see Patent Document 7), method of embedding pitch having anionic charge on paper using a cationic polymer (for example, see Patent Documents 8 to 10), adding microorganisms and enzymes to decompose pitch (For example, refer to Patent Documents 11 and 12) and the like have been proposed, but none of them has a sufficient effect of preventing pitch failure, and further improvement is desired.

JP-A-60-94687 Japanese Examined Patent Publication No. 61-48975 Japanese Patent Publication No. 63-23320 JP-A-60-246888 Japanese Patent Publication No.59-28676 Japanese Patent Publication No. 2-14479 Japanese National Patent Publication No. 11-503497 Japanese Patent Application Laid-Open No. 57-149591 Japanese Patent Publication No. 4-8556 Japanese Patent Publication No.7-113200 Japanese Patent Publication No. 4-29794 Japanese Patent Laid-Open No. 9-119085

  The present invention improves the dispersibility of pitch particles and colloidal pitch in the process water without affecting the production and product quality of the paper pulp in the paper pulp manufacturing process, preventing the aggregation of these, It is an object of the present invention to provide a pitch control agent and a pitch control method for preventing pitch troubles such as blemishes, defects, paper breaks, and workability deterioration.

  As a result of intensive studies on pitch control in the paper pulp manufacturing process, the present inventors obtained knowledge that an epihalohydrin-modified product of a specific water-soluble polyamide polyamine condensate exhibits an excellent pitch dispersion action. The invention has been completed.

  That is, the invention according to claim 1 is an amino group in the polyamide polyamine condensate obtained by adding an epihalohydrin to a polyamide polyamine condensate obtained from a dicarboxylic acid compound (2 to 10 carbon atoms) and a polyalkylene polyamine (2 to 10 carbon atoms). Water-soluble polyamide polyamine-epihalohydrin condensate obtained by reacting in a molar ratio of 1: 0.005 to 1: 0.3 as an active ingredient. It is a pitch control agent.

  The invention according to claim 2 is the pitch control agent for the paper pulp manufacturing process according to claim 1, wherein the polyamide polyamine condensate is a dicarboxylic acid compound and a polyalkylene polyamine in a molar ratio of 1: 0.8 to 1.4. It is obtained by making it react in the range of.

  The invention according to claim 3 is the pitch control agent for the paper pulp manufacturing process according to claim 1 or 2, wherein the dicarboxylic acid compound is adipic acid and / or sebacic acid.

  The invention according to claim 4 is the pitch control agent for the paper pulp manufacturing process according to any one of claims 1 to 3, wherein the polyalkylene polyamine is diethylenetriamine and / or triethylenetetramine. To do.

  The invention according to claim 5 is the pitch control agent for the paper pulp production process according to any one of claims 1 to 4, wherein the epihalohydrin is epichlorohydrin.

  The invention according to claim 6 is a step of producing pulp or paper, wherein the pitch control agent according to any one of claims 1 to 5 is 0.001% by weight as a water-soluble polyamidepolyamine-epihalohydrin condensate with respect to the pulp. It is a pitch control method for a paper pulp manufacturing process characterized by adding ˜1% by weight.

  The invention according to claim 7 is a paper pulp manufacturing process characterized in that, in the process of manufacturing pulp or paper, the pitch control agent according to any one of claims 1 to 5 is sprayed on a manufacturing apparatus to which a pitch adheres. This is a pitch control method.

  According to the present invention, in the paper pulp manufacturing process, the dispersibility of pitch particles and colloidal pitch in the process water is improved without affecting the paper pulp manufacturing and product quality, and the aggregation of these is prevented. Adhering to manufacturing equipment such as paper, fan pumps, piping, chests, wires, felts, rolls, etc. Pitch obstruction is improved and it contributes greatly to product quality, productivity and workability improvement, and manufacturing cost reduction.

  The present invention relates to a polyamide polyamine condensate obtained by reacting a dicarboxylic acid compound and a polyalkylene polyamine in a specific ratio, and adding epihalohydrin to amino groups in the polyamide polyamine condensate in a specific range. It is a pitch control agent for paper pulp manufacturing processes characterized by containing a water-soluble polyamidepolyamine-epihalohydrin condensate obtained by reacting as an active ingredient, and a pitch control method using the same.

  The paper pulp production process in the present invention is a selection process, a bleaching process, a preparation process, a paper making process, a press process, a recovery process, a decontamination process, and a deinking process in various processes for producing digested paper and pulp. Includes equipment such as pipes, pumps, storage tanks and the like attached to each process in contact with process water containing pulp. Pitch is derived from pulp and various chemicals added to the process (for example, sizing agent, paper strength agent, etc.), and is a hydrophobic adhesive dispersed in the process water in fine particles and colloids. It is a hydrophobic adhesive that adheres to the apparatus and piping in the process, peels off for some reason, and floats, suspends or disperses in process water.

  The dicarboxylic acid compound of the present invention (hereinafter referred to as “dicarboxylic acid compound”) has two carboxyl groups in the molecule, and may be any of aliphatic, aromatic, and alicyclic systems. It is a dicarboxylic acid monoester or dicarboxylic acid diester of a C2-C10 dicarboxylic acid, the dicarboxylic anhydride, and the dicarboxylic acid and a C1-C5 alcohol. Specific examples of dicarboxylic acids include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, heptanedioic acid, octanedioic acid, nonanedioic acid, sebacic acid, maleic acid, fumaric acid, phthalic acid, isophthalic acid, Terephthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, cyclohexane-1,3-dicarboxylic acid, cyclohexane-1,4-dicarboxylic acid, cyclopentanedicarboxylic acid, 3-methyltetrahydrophthalic acid, 4-methyltetrahydrophthalic acid Examples include acid, 3-methylhexahydrophthalic acid, and 4-methylhexahydrophthalic acid. Of these, adipic acid and sebacic acid are preferred because they are easily available industrially. These dicarboxylic acid compounds can be used alone or in combination of two or more.

  The polyalkylene polyamine of the present invention (hereinafter referred to as “polyalkylene polyamine”) is formed between an alkylene diamine having 2 to 10 carbon atoms in which two primary amino groups are bonded by an alkylene group and two primary amino groups. It is a polyalkylene polyamine having 2 to 10 carbon atoms in which one or more secondary amino groups are present and bonded with an alkylene group. Specifically, as the alkylene diamine, ethylene diamine, 1,2-propanediamine, 1,3-propanediamine, 1,2-butylenediamine, 1,3-butylenediamine, 1,4-butylenediamine, 2,3- Examples include butylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, and decanediamine. Examples of the polyalkylene polyamine include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, and iminobispropylamine. Among these, diethylenetriamine and triethylenetetramine are preferable because they are easily available. These polyalkylene polyamines can be used alone or in combination of two or more.

  The polyamide polyamine condensate of the present invention (hereinafter referred to as “polyamide polyamine condensate”) is a condensation reaction product of a dicarboxylic acid compound and a polyalkylene polyamine. The composition of the dicarboxylic acid compound and the polyalkylene polyamine in the polyamide polyamine condensate is usually in a molar ratio of 1: 0.5 to 1: 2, preferably 1: 0.8 to 1: 1.4, more preferably 1: 0. .9 to 1: 1.2. If the molar ratio of the dicarboxylic acid compound and the polyalkylene polyamine is outside the range of 1: 0.5 to 1: 2, the pitch control effect of the present invention cannot be sufficiently obtained.

The condensation reaction of the dicarboxylic acid compound and the polyalkylene polyamine is usually performed by mixing the dicarboxylic acid compound and the polyalkylene polyamine under a nitrogen stream and heating to 120 ° C. to 180 ° C., preferably 140 ° C. to 170 ° C. To obtain a polyamide polyamine condensate. If it is 120 ° C. or lower, the reaction time becomes long, which is not preferable. Moreover, reaction by-products increase at 180 ° C. or higher, which is not preferable. Although this condensation reaction proceeds even without a catalyst, hydrohalic acids such as hydrochloric acid, hydrobromic acid and hydroiodic acid; sulfonic acid compounds such as sulfuric acid, benzenesulfonic acid and p-toluenesulfonic acid. Phosphoric acid; organic acids such as formic acid and acetic acid may be used. The amount of the acid catalyst is not particularly limited, and can be selected and determined as appropriate depending on the type and amount of the dicarboxylic acid compound and the polyalkylene polyamine, the molar ratio of both, and the degree of the required condensation reaction. However, it is usually 0.05 to 4 moles per 100 moles of polyalkylene polyamine. By using an acid catalyst, the reaction temperature is 110 ° C to 125 ° C, preferably about 145 ° C to 165 ° C, more preferably about 150 ° C to 155 ° C. The reaction time is appropriately determined and determined according to the kind and amount of the dicarboxylic acid compound and the polyalkylene polyamine, the molar ratio of both, and the required reaction temperature and degree of the condensation reaction, but is not uniformly determined. 4 to 10 hours. As a method for determining the degree of reaction between the dicarboxylic acid compound and the polyalkylene polyamine, for example, there is a method for determining by measuring the intrinsic viscosity ( _IV , 1M-NH ₄ · Cl, 2%, 25 ° C.).

  The water-soluble polyamide polyamine-epihalohydrin condensate of the present invention (hereinafter referred to as “water-soluble polyamide polyamine-epihalohydrin condensate”) is obtained by adding an epihalohydrin to the above-mentioned polyamide polyamine condensate and performing a crosslinking reaction with the epihalohydrin. It is done. As epihalohydrin, there are epichlorohydrin, epibromohydrin and the like, and epichlorohydrin is preferable from the viewpoint of availability.

  The amount of epihalohydrin used in the synthesis of the water-soluble polyamidepolyamine-epihalohydrin condensate ranges from 0.005 mol to 0.3 mol of epichlorohydrin in a molar ratio with respect to 1 mol of amino groups in the polyamidepolyamine condensate. The reaction is preferably carried out at 0.01 mol to 0.1 mol. If the epihalohydrin is less than 0.005 mol, the pitch control effect of the present invention cannot be obtained. On the other hand, when the epihalohydrin exceeds 0.3 mol, the obtained polyamide polyamine-epihalohydrin condensate is likely to thicken, and may be gelled or lose water solubility, so that it is stable water-soluble polyamide polyamine-epihalohydrin condensation. I can't get anything. Moreover, when added to the pulp production process water, a wet paper strength-enhancing effect is produced, which affects the operating conditions such as pulp agglomeration and changes in paper quality due to an increase in wet paper strength, which is not preferable.

  The reaction between the polyamide polyamine condensate and the epihalohydrin is usually performed by preparing an aqueous polyamide polyamine solution, gradually adding the epihalohydrin aqueous solution while stirring at room temperature (20 ° C. or less), and further stirring for 1 to 3 hours. And epihalohydrin are added. Next, the mixture is heated to 30 ° C. to 80 ° C. and stirred for 1 to 3 hours to allow the crosslinking reaction with the epihalohydrin added to the polyamide polyamine to proceed. Alternatively, the epihalohydrin aqueous solution is gradually added to the polyamide polyamine aqueous solution with stirring at room temperature (20 ° C. or lower), and after the addition, the mixture is maintained at 30 to 50 ° C. (preferably about 40 ° C.) for 1 to 2 hours. Then, the mixed solution may be gradually heated to 55 ° C. to 75 ° C. and stirred for 1 to 3 hours to proceed with the crosslinking reaction of the added epihalohydrin. The degree of cross-linking is determined in advance by measuring the intrinsic viscosity range of a water-soluble polyamide polyamine-epihalohydrin condensate having the desired degree of cross-linking. Is added to adjust the pH to 2.0 to 4.5 to obtain a target polyamidepolyamine-epihalohydrin condensate aqueous solution. Examples of acids used for pH adjustment include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, and phosphoric acid, and organic acids such as formic acid, acetic acid, propionic acid, lactic acid, citric acid, malic acid, tartaric acid, and gluconic acid.

  The pitch control agent for paper pulp manufacturing process of the present invention (hereinafter referred to as “pitch control agent”) is a pitch control agent containing a water-soluble polyamidepolyamine-epihalohydrin condensate as an active ingredient, and its blending ratio is particularly limited. Although not intended, it is usually an aqueous solution containing 10 to 60% by weight of a water-soluble polyamidepolyamine-epihalohydrin condensate in consideration of handleability. Furthermore, other process additives, such as surfactants, antifoaming agents, scale control agents, slime control agents for imparting dispersibility and penetrability to the extent that the effects of the pitch control agent of the present invention are not hindered, and conventionally A nonionic surfactant, a water-soluble cationic polymer, a cationic surfactant, or the like, which has been used as a pitch control agent component, may be blended and used in combination.

  The pitch control method of the present invention suppresses the adhesion of pitch by adding the pitch control agent of the present invention to the pulp slurry or white water in the previous stage or in the previous process where the pitch failure occurs in the paper pulp manufacturing process. Furthermore, it is a method for preventing aggregation of fine particulate pitch and colloidal pitch in the process water. The amount of addition may be appropriately determined according to the type of pulp and paper, process conditions, pitch generation status, and the required degree of pitch suppression. Usually, a water-soluble polyamidepolyamine-epihalohydrin condensate is added to the pulp. The weight ratio is 0.001 to 1% by weight, preferably 0.01 to 0.5% by weight. As a method of adding a pitch control agent, there are a method of continuously adding to a pulp slurry or white water in a previous stage or a previous process of a location where a pitch failure has occurred using a chemical injection pump, and a method of intermittently adding using a timer. Any of these may be used.

  In addition, as a pitch control method of the present invention, a method of spraying the pitch control agent of the present invention to a manufacturing apparatus to which pitch adheres in a paper pulp manufacturing process may be used. Specifically, the pitch control agent of the present invention is appropriately diluted (for example, diluted to about 1 to 10% by weight), and the washing shower such as a wire, a roll, a felt or a roll in a pressing process, to which the pitch easily adheres. There is a method of spraying directly into the water line and spraying with shower water, or by installing a spray device. In this case, the addition amount of the pitch control agent is usually 0.001% to 0.5% by weight, preferably 0.01 to 0.00% by weight of the water-soluble polyamidepolyamine-epihalohydrin condensate with respect to the shower water. 1% by weight. By this method, it is possible to prevent the adhesion of the pitch and to reduce the adhesiveness of the attached pitch, thereby suppressing the accumulation of the pitch. In addition, this method improves the time and effort required to clean and remove the adhered pitch with a cleaning agent by stopping the apparatus during regular repairs or when the dirt is severe.

  In general, pitch has a weak anionic charge and is dispersed in the form of fine particles or colloids in process water, which is considered to cause pitch disturbance due to its agglomeration due to its agglomeration. The pitch control agent of the present invention includes a water-soluble polyamidepolyamine-epihalohydrin condensate having a cationic charge as an active ingredient, thereby surrounding the finely dispersed pitch particles or colloidal pitch having a weak anionic charge in a charge-stable manner. To prevent agglomeration. Furthermore, by having a partially cross-linked structure, agglomeration due to the bonding of finely dispersed pitch particles having a weak anionic charge or colloidal pitch surrounding and adjacent pitch dispersed particles is prevented. In order to exert this effect, it is important to have a cationic structure and an appropriate crosslinking structure while maintaining water solubility, and in addition, there is no effect on paper strength in either case of continuous addition or intermittent addition. It is important to exert a pitch control effect. For this purpose, a level of epihalohydrin cross-linking that affects paper strength like conventional wet paper strength agents is not preferred. On the other hand, the pitch control effect of the polyamide polyamine condensate without cross-linking is already known, but it is not a sufficiently satisfactory level. The present invention relates to a pitch control agent and a pitch control method utilizing the fact that a water-soluble polyamidepolyamine-epihalohydrin condensate having a low level of crosslinking that cannot be applied as a wet paper strength agent has an excellent pitch control effect that cannot be expected. There has been no suggestion of such a pitch control agent and pitch control method.

EXAMPLES The present invention will be described in detail by examples, but the present invention is not limited to these examples.

(Dibasic acid carboxylic acid compound)
Adipic acid (A-1): Reagent, Kanto Chemical Co., Inc.
-Sebacic acid (A-2): Reagent, Kanto Chemical Co., Inc.

(Polyalkylpolyamine)
・ Diethylenetriamine (B-1): Reagent, Kanto Chemical Co., Inc.
・ Triethylenetetramine (B-2): Reagent, Kanto Chemical Co., Inc.

(Epihalohydrin)
Epichlorohydrin (C-1): Reagent, Kanto Chemical Co., Inc.
Epibromohydrin (C-2): Reagent, Kanto Chemical Co., Inc.

(Other)
20% sulfuric acid (D-1): Reagent, Kanto Chemical Co., Inc.
10% hydrochloric acid (D-2): Reagent, Kanto Chemical Co., Inc.
10% phosphoric acid (D-3): Reagent, Kanto Chemical Co., Inc.
10% sulfamic acid (D-4): Reagent, Kanto Chemical Co., Inc.
10% lactic acid (D-5): Reagent, Kanto Chemical Co., Inc.
・ Mistrone Vapor (E-1): “Mistrone Vapor” [trade name, manufactured by Nippon Mistron Co., Ltd.]
Anionic polymer (E-2): Maleic anhydride-diisobutylene copolymer (molecular weight about 10,000) “Polystar OM” (trade name, manufactured by NOF Corporation)
Cationic polymer (E-3): polydimethyldiallylammonium chloride (molecular weight about 2,000) “KZ-63K” (trade name, manufactured by Senka Co., Ltd.)
Cationic surfactant (E-4): trimethyldodecyl ammonium chloride “Nissan Cation BB” (trade name, manufactured by NOF Corporation)
Nonionic surfactant (E-5): monostearylamine ethylene oxide (20 mol) adduct [C ₁₈ H ₃₇ N ((CH ₂ CH ₂ O) ₁₀ H) ₂ ] “Nissan Naimine S-220” ( Product name, manufactured by Nippon Oil & Fats Co., Ltd.

(Preparation of polyamide polyamine-epichlorohydrin condensate and preparation of pitch control agent)
In a 500 mL four-necked flask equipped with a thermometer, Liebig condenser and stirrer, 146 g (1.0 mol) of adipic acid, 103 g (1.0 mol) of diethylenetriamine, 10 g of water and 2 g of 98% sulfuric acid (0.02 mol) The mixture was allowed to react at 155 ° C. to 160 ° C. for 8 hours while gradually elevating the temperature and removing water. After the reaction, the mixture was naturally cooled and 210 g of water was gradually added to obtain a 50.1 wt% polyamide polyamine condensate aqueous solution (680 mPa · s). Next, in a 1000 mL four-necked flask equipped with a thermometer, a Liebig condenser, and a stirrer, 130 g of a 50.1 wt% polyamide polyamine condensate aqueous solution (0.3 mol as a secondary amino group) and 60 g of water were placed at 15 ° C. While maintaining at ˜20 ° C., 0.46 g (0.005 mol) of epichlorohydrin was added dropwise, and the temperature was raised to 35 ° C. to 40 ° C. while stirring for 4 hours. Thereafter, 70 g of water was added, diluted to a 25 wt% polyamide polyamine condensate aqueous solution, gradually heated to 55 ° C. to 60 ° C. and maintained for 2 hours to complete the crosslinking reaction. Under stirring, 170 g of water was added little by little, and the mixture was cooled to room temperature. The pH was adjusted to 3.4 with 20% sulfuric acid, and 15% by weight of polyamide polyamine-epichlorohydrin condensate No. 1 1 (viscosity 30 mPa · s) was obtained, and a pitch control agent No. 1 was obtained. It was set to 1. Similarly, the ratio of adipic acid and diethylenetriamine and the ratio of epichlorohydrin were changed, and various polyamide polyamine-epichlorohydrin condensates No. 1 in Table 1 were changed. 2-18 were prepared, and each pitch control agent No. 2-18.

(Pitch adhesion suppression test 1)
The pitch is collected from the foil of a paper machine at a paper mill where the paper is frequently broken due to the pitch adhering to the wire, foil, felt, and roll of a newspaper paper machine. 20% concentration pitch sample. Also, white paper water was collected from the white water pit under the wire of the paper machine, and used as a test solution. After taking 100 mL of the test solution into a 200 mL beaker and adding an equivalent amount of 100 mg as an active ingredient of the pitch control agent, the stirring unit (mixer stirring) of TK auto homomixer M type (trade name, manufactured by Tokushu Kika Kogyo Co., Ltd.) The pitch sample (500 mg) was injected while stirring at 9,000 rpm, with the wing part) completely immersed in the test solution, and further stirred for 1 minute. The deposits of the beaker and the mixer were dissolved and extracted with chloroform to determine the adhesion amount, and the pitch adhesion prevention rate (%) was determined from the following formula.
Pitch adhesion inhibition rate (%) = [(ab) / a] × 100
a: Amount of adhesion when no pitch control agent is added (mg)
b: Adhesion amount at the time of pitch control agent addition (mg)
The higher the pitch adhesion inhibition rate (%), the higher the effect of the pitch control agent. The results are shown in Table 2.

  The pitch control agent comprising the polyamidopolyamine-epichlorohydrin condensate of the present invention as an active ingredient is compared with the conventional inorganic pitch control agent, mythrone vapor, polymer pitch control agent and surfactant pitch control agent. It can be seen that it has an excellent pitch adhesion prevention effect.

(Pitch adhesion suppression test 2)
In a machine that makes liner and core base paper using waste paper as a raw material, sticky pitch adheres to wires, rolls, especially 1P felt in the pressing process, and paper breaks and perforations frequently occur. Therefore, 0.1% by weight (vs. pulp) of Mistrone Vapor (E-1) is added to the mixing chest, and a pitch control agent [polydiallyl is added to the wire washing shower washing line and the 1P felt shower washing line in the pressing process. Shower washing was performed by adding 100 ppm (vs. shower water) of 90:10 mixture by weight ratio of dimethylammonium chloride (E-3) and dodecyltrimethyl quaternary ammonium salt type cationic activator (E-4). However, it was necessary to wash the wire and felt once every three days, and many paper breaks occurred, which hindered production. Therefore, the pitch control agent No. 1 of the present invention. 3 (polyamide polyamine-epichlorohydrin condensate No. 3 15 wt% aqueous solution), pitch control agent No. 3 8 (15% by weight aqueous solution of polyamide polyamine-epichlorohydrin condensate No. 8), pitch control agent No. 8 6 (15% by weight aqueous solution of polyamide polyamine-epichlorohydrin condensate No. 6) and the conventional product were compared with each other. Evaluation was made by visual evaluation of “felt pitch adhesion amount”, “number of times of washing (times / week)”, and “number of times of paper break (times / week)” and their overall evaluation. Among them, "felt pitch adhesion amount" is the current formulation of mythrone vapor (E-1) and pitch control agent [polydiallyldimethylammonium chloride (E-3) and dodecyltrimethyl quaternary ammonium salt type cationic property. In visual evaluation based on 90:10 mixture by weight ratio of activator (E-4)], the amount of adhesion is larger than when using the current product.
Δ: The amount of adhesion is the same as when using the current product.
○: Less adhesion than when using the current product.
From the results of “felt adhesion amount of felt”, “number of times of washing (times / week)”, and “number of times of paper break (times / week)”, “comprehensive evaluation” was performed as follows.
X: There is a pitch failure and it is defective.
○: Good with no pitch obstruction.
The results are shown in Table 3.

  By adding the pitch control agent of the present invention to the shower washing line, mistron vapor (E-1), polydiallyldimethylammonium chloride (E-3) and dodecyltrimethyl quaternary ammonium salt type cationic activator (E- It can be seen that the weight control ratio of 4) shows a pitch control effect superior to the combined use of the 90:10 mixture and greatly contributes to stable operation.

Claims (7)

  Epihalohydrin is added to a polyamide polyamine condensate obtained from a dicarboxylic acid compound (2 to 10 carbon atoms) and a polyalkylene polyamine (2 to 10 carbon atoms) in a molar ratio of 1: 0. A pitch control agent for a paper pulp production process, comprising a water-soluble polyamidepolyamine-epihalohydrin condensate obtained by reacting in a range of 005 to 1: 0.3 as an active ingredient.   The pitch control agent for a paper pulp manufacturing process according to claim 1, wherein the polyamide polyamine condensate is obtained by reacting a dicarboxylic acid compound and a polyalkylene polyamine in a molar ratio of 1: 0.8 to 1.4.   The pitch control agent for a paper pulp manufacturing process according to claim 1 or 2, wherein the dicarboxylic acid compound is adipic acid and / or sebacic acid.   The pitch control agent for a paper pulp manufacturing process according to any one of claims 1 to 3, wherein the polyalkylene polyamine is diethylenetriamine and / or triethylenetetramine.   The pitch control agent for paper pulp manufacturing process according to any one of claims 1 to 4, wherein the epihalohydrin is epichlorohydrin.   In the step of producing pulp or paper, the pitch control agent according to any one of claims 1 to 5 is added to the pulp as a water-soluble polyamidepolyamine-epihalohydrin condensate in an amount of 0.001 wt% to 1 wt%. A pitch control method for a pulp and paper manufacturing process.   A pitch control method for a paper pulp manufacturing process, wherein the pitch control agent according to any one of claims 1 to 5 is sprayed on a manufacturing apparatus to which a pitch adheres in a process of manufacturing pulp or paper.