JP3306590B2 - Pitch adhesion inhibitor and pitch adhesion prevention method using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pitch adhesion preventing agent for suppressing and preventing pitch disturbance in a pulp and paper manufacturing process, and a pitch adhesion preventing method using the same.

[0002]

2. Description of the Related Art Generally, there is a substance called pitch in a pulp and paper manufacturing process. This pitch refers to a natural resin or gum substance released from wood, pulp and paper, and furthermore, a water-insoluble adhesive substance mainly composed of organic substances derived from additive chemicals used in pulp and papermaking processes. . Generally, the pitch is colloidally dispersed during the pulp and papermaking process, especially in white water, but has some external effects, such as high shear forces, pH
It is considered that the colloidal state was destroyed due to a rapid change in pH, excessive addition of a sulfate band, etc., resulting in aggregation and enlargement. This cohesion, the pitch generated by the giant, due to its stickiness, adheres to pulp and paper, further adheres to manufacturing equipment such as fan pumps, pipes, chests, wires, felt, rolls, and Later peeling and reattachment to the pulp or paper may cause stains and defects on the paper, which may cause deterioration in quality and pitch disturbances such as reduction in productivity and workability due to occurrence of paper breakage. In recent years, as the use of chemicals has increased due to the diversification of paper and the use of closed water used in the manufacturing process has increased, the occurrence of pitch disturbances has increased more than ever, and the form of occurrence has become more complicated. That is the current situation.

[0003] As a method of preventing or reducing the trouble due to the adhesion of pitch in the paper making process, there are (1) a method of mechanically removing the pitch, and (2) a method of adding an adsorbent inorganic fine powder to a raw material to prevent the pitch from sticking. (3) adding a surfactant to the raw material to promote the dispersion of the agglomerated pitch particles, and at the same time, reduce the tackiness to prevent agglomeration; Method of making paper,
(4) A method of dissolving the pitch with an organic solvent to remove the pitch from the system is known. However, in the method (1), the removal operation is very complicated. The pitch adhesion inhibitor used in the above methods (2), (3) and (4) is often added in a chest after pulper, after a refiner, a mixing chest, a machine chest or the like. As described above, most of the conventional pitch adhesion preventing agents take out pitch particles out of the system and those that disperse the pitch particles in the system.

[0004]

The inorganic carrier which is the adsorbable inorganic fine powder of the above (2) has a dispersing and adsorbing effect, but on the other hand, a heater, a refiner, a wire,
In addition to causing abrasion of the roll doctor and clogging of the press felt, there are drawbacks in that the effect must be weakened unless it is added in several places, and that a large amount of drug is required to prevent pitch disturbance. Further, in the case of using the surfactant (3) and the organic solvent (4) in combination to dissolve and disperse the pitch particles in the pulp slurry, with the increase in the water recovery rate, There is a problem that the accumulation of the dissolving pitch, the breakage of the paper making equipment and the tools, the deterioration of the working environment, and the unpredictable pitch failure are caused.

[0005] The present inventors have previously disclosed in Japanese Patent Application Laid-Open No. 8-33798.
As disclosed in Japanese Patent Publication No. 8 (1996), research on a pitch adhesion inhibitor was carried out, and a certain effect was successfully achieved.
However, the effect was still insufficient.

The present invention has been made in view of such circumstances, and relates to a pitch adhesion preventing agent capable of preventing an obstacle due to pitch adhesion in a pulp or paper manufacturing process, and a pitch adhesion preventing method using the same. Things.

[0007]

In order to achieve the above object, the present invention provides a pitch adhesion inhibitor containing the following components (A), (B) and (C) as a first gist. I do. (A) Condensate of dicyandiamide and polyalkylene polyamine. (B) a cationic surfactant. (C) Nonionic surfactant having an HLB of 9.0 to 18.0.

A second gist of the present invention is to provide a method for preventing pitch adhesion by spraying the above-mentioned solution containing a pitch adhesion inhibitor on at least a part of a papermaking machine which comes into contact with raw materials of the pulp or paper when producing pulp or paper. I do.

That is, the present inventors have conducted a systematic study on the suppression of the occurrence of pitch adhesion in the pulp and paper manufacturing process. Then, in order to obtain an agent for preventing the adhesion of the pitch, various compounds were used in combination and the like, and as a result, a cationic condensate of a specific structure of dicyandiamide and polyalkylene polyamine (component A) was obtained.
, A cationic surfactant (component B), and HLB of 9.0.
It has been found that an excellent pitch adhesion preventing effect can be obtained by using a pitch adhesion preventing agent in combination with a nonionic surfactant (component C) of ~ 18.0. In particular, the cationic condensate (component A) and the cationic surfactant (B
Component) (weight ratio): A component: B component = 1:
0.05 to 1: 2.5, and a cationic condensate (A
Component) and the cationic surfactant (component B) based on the total amount of the nonionic surfactant (component C) relative to the total amount (weight ratio)
(A component + B component): C component = 1: 0.5 to 1:10
By setting the value in the range, particularly excellent pitch adhesion preventing effect can be obtained without causing various problems.

[0010] As a method of using the above-mentioned pitch adhesion preventive agent, the adhesion of pitch to the paper machine is remarkably suppressed by spraying a part of the paper machine in contact with the raw material of pulp or paper to prevent the occurrence of pitch disturbance. It has been found that the present invention can be achieved.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The pitch adhesion inhibitor of the present invention comprises a cationic condensate having a specific structure (component A), a cationic surfactant (component B), and a specific nonionic surfactant (component C). Is obtained by using

The cationic condensate of the component A is a condensation polymer obtained by using dicyandiamide and polyalkylene polyamine and subjecting them to a condensation reaction.

[0013] Among the above polyalkylene polyamines,
Polyalkylene polyamines containing 2 to 5 nitrogen atoms are preferred because they are easy to obtain and handle. Specific examples include ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and the like, with diethylenetriamine being particularly preferred. These may be used alone or in combination of two or more.

The cationic condensate of the component A is, for example, the dicyandiamide and the polyalkylenepolyamine,
It can be obtained by conducting a condensation reaction by a known method at a temperature of 150 to 200 ° C. At this time, the reaction ratio between the two is preferably set in a molar ratio of dicyandiamide / polyalkylenepolyamine = 0.7 / 1 to 1 / 0.7.

Examples of the cationic surfactant of component B include alkyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride, and alkyldimethylethylammonium ethyl sulfate. These may be used alone or in combination of two or more. As the alkyl group in the above-mentioned compounds, an alkyl group having 8 to 18 carbon atoms is preferable from the viewpoint that it is difficult to obtain the intended performance if the number of carbon atoms described below is out of the range, and specifically, octyl. Group, dodecyl group, octadecyl group and the like. Examples of such a cationic surfactant include dodecyldimethylbenzylammonium chloride, octadecyltrimethylammonium chloride, octyldimethylethylammoniumethylsulfate and the like, and preferably dodecyldimethylbenzylammonium chloride.

As the nonionic surfactant of the C component, H
At least one nonionic surfactant having an LB value selected from the range of 9.0 to 18.0 is used. By adding such a nonionic surfactant, the pitch is emulsified and dispersed, and the pitch attached to the manufacturing equipment and the felt is washed, so that the conventional pitch adhesion preventing agent consisting of only the A component and the B component is used. The amount of attached pitch can be further reduced. When the HLB is less than 9.0, the cleaning effect of manufacturing equipment and felt is reduced due to a decrease in the emulsifying and dispersing properties of the pitch, causing an increase in pitch deposits on a suction lip or the like or accompanying pitch adhesion. This causes an increase in felt stain, a decrease in felt air permeability (clogging), and the like. If it exceeds 18.0, a sufficient pitch adhesion preventing effect may not be obtained. The value of HLB is 11.
More preferably, it is in the range of 0 to 15.0.

Examples of the nonionic surfactant of the component C include polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyalkylene alkyl aryl ether, polyoxyalkylene alkyl ester, polyoxyalkylene alkenyl ester, polyoxyalkylene. Examples thereof include an alkylaryl ester, a polyoxyalkylenealkylamine, a polyoxyalkylenealkylamide, and a polyoxyalkylene, and these may be used alone or in combination of two or more. Among them, those having a hydrophobic group having 8 to 18 carbon atoms are preferable, more preferably a polyoxyalkylene derivative of an aliphatic alcohol having 8 to 18 carbon atoms, and still more preferably a polyoxyalkylene derivative having 8 to 18 carbon atoms. It is an oxyethylene derivative. Here, carbon number 8 ~
18 alcohols are coconut oil, palm oil, palm kernel oil,
Alcohol obtained from beef tallow or the like or a further modified natural alcohol may be used. Ziegler alcohol (linear primary alcohol), oxo alcohol (linear primary alcohol, branched primary alcohol), secondary alcohol It may be a synthetic alcohol such as (linear secondary alcohol).

As described above, the C component has 8 to 1 carbon atoms.
8 is a polyoxyalkylene derivative of an aliphatic alcohol, and its HLB is preferably at least one nonionic surfactant selected from the range of 9.0 to 18.0. It is a polyoxyethylene derivative of an alkyl alcohol of Formulas 8 to 18, and at least one nonionic surfactant whose HLB is selected from the range of 11.0 to 15.0.

More preferable examples of the nonionic surfactant of the component C include, for example, polyoxyethylene octyl ether, polyoxyethylene decyl ether, polyoxyethylene dodecyl ether, polyoxyethylene tridecyl ether, Examples thereof include polyoxyethylene tetradecyl ether, polyoxyethylene pentadecyl ether, polyoxyethylene hexadecyl ether, polyoxyethylene octadecyl ether, and polyoxyethylene octadecenyl ether.
These may be used alone or in combination of two or more.

The mixing ratio of the above components is such that the mixing ratio of the cationic condensate of the component A and the cationic surfactant of the component B is, by weight ratio, A component: B component = 1: 0.05 to 1:
2.5, and the mixing ratio of the nonionic surfactant of the C component to the total amount of the A component and the B component is, by weight ratio,
(A component + B component): It is preferable that C component = 1: 0.5 to 1:10. Particularly preferably, the component A:
B component = 1: 0.3 to 1: 1.8, and (A component + B component): C component = 1: 1 to 1: 5.
When the mixing ratio of the component B to the component A is less than 0.05, the wettability of the production equipment is reduced, so that the coating of the component A becomes insufficient, and the adhesion of the pitch component to the equipment is effectively prevented. Becomes difficult. Further, when the mixing ratio of the component B to the component A exceeds 2.5, the adhesion of the component A to the devices is reduced and the coating is not sufficiently performed.
It is difficult to effectively prevent the pitch component from adhering to devices. On the other hand, C with respect to the total amount of the component A and the component B
If the compounding ratio of the component is less than 0.5, the cleaning effect of the manufacturing equipment and felt is reduced due to a decrease in the emulsifying and dispersing properties of the pitch, causing an increase in pitch deposits on the suction lip and the like, and pitch adhesion. May cause an increase in felt stain, a decrease in felt air permeability (clogging), and the like. Further, C with respect to the total amount of the component A and the component B
When the compounding ratio of the component exceeds 10, the amount of the component A attached to the devices decreases and the coating is not sufficiently performed, and furthermore, the fixing property of the pitch particles to the pulp fiber surface is reduced. In some cases, it may be difficult to effectively prevent adhesion to the surface.

In the pitch adhesion preventing agent of the present invention, if necessary, in addition to the above components A, B and C,
It is preferable to mix the component D which is an acidic substance having a molecular weight of 300 or less. By the addition of the acidic substance, the adhesion of the pitch containing the inorganic substance derived from the filler and the pigment added to the paper to production equipment and felt is suppressed. Here, if the molecular weight of the acidic substance exceeds 300, it may not be possible to prevent the pitch containing the inorganic substance from adhering to manufacturing equipment or felt.

Specific examples of the acidic substance of the component D include hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, formic acid, acetic acid, propionic acid, malonic acid, glycolic acid, gluconic acid, oxalic acid, adipic acid, Lactic acid, malic acid, citric acid, tartaric acid, pyruvic acid, benzoic acid, salicylic acid, phthalic acid, maleic acid, fumaric acid, methylsulfuric acid, ethylsulfuric acid, benzenesulfonic acid, toluenesulfonic acid, phenolsulfonic acid and the like are preferable. Is hydrochloric acid, sulfuric acid, phosphoric acid,
Acetic acid, glycolic acid, lactic acid, malic acid, citric acid, benzoic acid, salicylic acid, phthalic acid, maleic acid, fumaric acid and the like. These can be used alone or in combination of two or more.

The mixing ratio of the acidic substance of the component D is a weight ratio to the total amount of the component A and the component B, and is (A component + B component): D component = 1: 0.1 to 1: 2.0. Preferably, there is more preferably (A component + B component):
D component = 1: 0.2 to 1: 1.5. When the blending ratio of the D component to the total amount of the A component and the B component is less than 0.1, the adhesion of the pitch containing the inorganic substance derived from the filler or the pigment added to the paper to the equipment or the felt cannot be suppressed. In some cases, when the compounding ratio of the D component exceeds 2.0, corrosion or deterioration may be caused to the materials constituting the equipment and the felt.

Next, a method for preventing pitch adhesion using the pitch adhesion inhibitor of the present invention will be described.

The pitch adhesion preventing method using the pitch adhesion preventing agent of the present invention is characterized in that, when pulp or paper is produced, the pitch adhesion preventing method according to the present invention is applied to at least a part of a papermaking machine which comes into contact with the pulp or paper raw material. This is a method of preventing the adhesion of pitch to a felt, a wire, a roll, a suction box or the like of a paper machine by directly spraying a solution containing the agent.

In the above method, when a solution containing a pitch adhesion inhibitor is sprayed onto at least a part (for example, felt, wire, roll, etc.) of a papermaking machine, the concentration of the pitch adhesion inhibitor in the solution is 0. .003-
It is preferable to set it in the range of 10% by weight (hereinafter abbreviated as "%"), and particularly from 0.003 to 0.003 in view of cost.
It is preferable to set in the range of 0.05%. In particular,
In the concentration range of 0.003 to 0.05%, a sufficient pitch adhesion preventing effect can be obtained. If the concentration of the pitch adhesion inhibitor is less than 0.003%, it is difficult to obtain a desired pitch adhesion prevention effect. Even if the concentration is set to more than 10%, the cost is increased but the effect is significantly improved. I can't.

The solution containing the above-mentioned pitch adhesion preventing agent is generally an aqueous solution. As a spraying method, for example, the above-mentioned aqueous solution is press-fitted into a washing water shower line to easily attach a pitch to a wire or felt. , Rolls and the like are sprayed together with shower water. Alternatively, there is a method in which a spray for aqueous solution spraying is installed separately from the washing water shower line to perform spraying.

The types of pulp and paper in the pulp and paper manufacturing process to which the pitch adhesion preventing method of the present invention is applied are not particularly limited, and all pulp and paper currently manufactured and processed are not particularly limited. Paper is targeted and is effective against them.

[0029]

EXAMPLES Examples of the present invention will be described below together with comparative examples.

First, condensates A-1 and A- of the following two types of dicyandiamide and polyalkylenepolyamine
2 was prepared. The condensate is at a temperature of 180 ° C.
It was prepared by performing a condensation reaction by a known method. A-1: dicyandiamide / ethylenediamine = 1/1
(Molar ratio) condensate A-2: dicyandiamide / diethylenetriamine = 1
/ 1 (molar ratio) condensate

Further, two kinds of cationic surfactants B-1 and B-2 shown below were prepared. B-1: dodecyldimethylbenzylammonium chloride B-2: octadecyltrimethylammonium chloride

Further, the following six types of nonionic surfactants C-1 to C-6 were prepared. C-1: polyoxyethylene sec-dodecyl ether (oxyethylene repeating unit: 12.0), HLB = 14.
8 C-2: polyoxyethylene tridecyl ether (oxyethylene repeating unit: 8.4), HLB = 13.0 C-3: polyoxyethylene dodecyl ether (oxyethylene repeating unit: 5.3), HLB = 1
1.1 C-4: polyoxyethylene octadecyl ether (oxyethylene repeating unit: 31.1), HLB = 16.
7 C-5: polyoxyethylene octadecyl ether (oxyethylene repeating unit: 3.3), HLB = 8.8 C-6: polyoxyethylene butyl ether (oxyethylene repeating unit: 40), HLB = 19.2

Further, the following three types of acidic substances D-1
~ D-3 was prepared. D-1: phosphoric acid D-2: benzoic acid D-3: phthalic acid

Next, the above-mentioned cationic condensate, cationic surfactant, nonionic surfactant, and acidic substance are used in accordance with the combination shown in Table 1 below in the ratio (weight ratio) shown in the table.
By mixing, the pitch adhesion preventing agents a to
t and pitch adhesion inhibitors u to w of Comparative Examples were prepared.

[0035]

[Table 1]

Then, a pitch adhesion prevention test was carried out using the above-mentioned pitch adhesion inhibitors a to w by the following method. First, in a device as shown in FIGS. 1 (A) and 1 (B), a hot water shower device 2 applies a pitch to a surface of a papermaking net (wire) 1 on which pitch is previously attached (pitch attachment amount: 750 mg / cm ² ). The test felt 3 (100 cm ² ) was driven so as to be in sliding contact with the wire 1 while being driven while spraying hot water. At this time, the aqueous solution of each pitch adhesion preventing agent shown in Table 1 was sprayed on the surface of the test felt 3 by the spraying device 9. In this way, the amount of the deposited pitch transferred from the wire 1 to the test felt 3 was measured. In FIG. 1, 4, 5,
Reference numerals 6, 7, and 8 are rolls. In addition, the said spraying conditions set the addition amount of the pitch adhesion inhibitor to 0.03% of the whole aqueous solution, and sprayed at 4 ml / m / min spraying amount for 5 hours. After the end of the spraying, the air permeability of the test felt 3 was measured, and the pitch transferred to the surface of the test felt 3 was
After washing and extraction with dichloroethane, the weight was weighed. Also, the amount of the pitch attached to the device (such as a roll) is visually evaluated, and AA,
A, B, C, and D were used. All the water used in the above test was white water of printing base paper making system obtained from an actual machine. The results are shown in Table 2 below.

[0037]

[Table 2]

From the results shown in Table 2 above, the pitch-adhering agents a to t of the present invention are excellent in the effect of preventing the pitch from adhering to the felt and the cleaning effect, and are extremely effective in preventing the clogging of the felt and the pitch accumulation on the apparatus. You can see that. Further, it can be seen that the above effects are inferior to the pitch adhesion preventing agents u to w of the comparative examples.

Next, a method for preventing pitch adhesion in an actual machine test will be described.

Example 1 Using a pitch adhesion inhibitor (j) shown in Table 1, a papermaking machine (Duoformer F, making speed 700 m / min) having the structure shown in FIG. While spraying the portion, papermaking [paper raw material (raw pulp slurry) flows in the direction of the thick arrow X] was performed to produce a core base paper. That is, in the papermaking machine, what is shown by a dotted line is a wire, and what is shown by a solid line is a felt. Then, in the component a, an aqueous solution containing a pitch adhesion inhibitor was sprayed on the felt surface by the spray shower 11 on the felt surface in contact with the paper. In component b, the shower 13 for spraying the felt surface in contact with the paper.
Was sprayed with an aqueous solution containing a pitch adhesion inhibitor on the felt surface. Then, in the component c, the aqueous solution containing the pitch adhesion inhibitor was sprayed on the felt surface by the spray shower 15 on the felt surface in contact with the paper. Further, in the component d, an aqueous solution containing a pitch adhesion inhibitor was sprayed on the felt surface by the spray shower 16 on the felt surface which comes into contact with the paper. In FIG. 2, 10, 1
2, 14, 17 are hot water shower devices, 18 is a suction box (suction dehydrator), and 19 is a press shoe. The spraying conditions were as follows: the addition amount of the pitch adhesion inhibitor was set to 0.005% of the total aqueous solution, and 5 ml / m
/ Min sprayed.

As a result, before the spraying of the aqueous solution containing the pitch adhesion preventing agent, the amount of the adhered pitch to the felt portion was considerably large, but when the aqueous solution containing the pitch adhesion preventing agent was sprayed continuously for 20 days, the felt surface was And rolls,
There was almost no sticking of pitch to suction boxes, wires, etc., and there was no need to stop the operation of this paper machine and clean the felt portion.

Example 2 Example 1 except that the pitch adhesion preventive agent (k) shown in Table 1 was used.
Under the same conditions as above, a core base paper was manufactured using a paper machine having the configuration shown in FIG.

As a result, before the spraying of the aqueous solution containing the pitch adhesion preventing agent, the amount of the adhered pitch to the felt portion was considerably large. When the aqueous solution containing the pitch adhesion preventing agent was sprayed continuously for 20 days, the felt surface was And rolls,
There was almost no sticking of pitch to suction boxes, wires, etc., and there was no need to stop the operation of this paper machine and clean the felt portion.

Example 3 Example 1 except that the pitch adhesion preventive agent (r) shown in Table 1 was used.
Under the same conditions as above, a core base paper was manufactured using a paper machine having the configuration shown in FIG.

As a result, before the spraying of the aqueous solution containing the pitch adhesion preventing agent, the amount of the pitch adhered to the felt portion was considerably large. However, when this aqueous solution containing the pitch adhesion preventing agent was sprayed continuously for 20 days, the felt surface was And rolls,
There was almost no sticking of pitch to suction boxes, wires, etc., and there was no need to stop the operation of this paper machine and clean the felt portion.

Example 4 Using a pitch adhesion inhibitor (i) shown in Table 1, a paper machine for producing printing base paper having a construction shown in FIG.
/ Min) while performing paper spraying (the raw pulp slurry flows in the direction indicated by the thick arrow Y) while spraying a predetermined portion of the raw paper pulp. That is, in the papermaking machine, what is shown by a dotted line is a wire, and what is shown by a solid line is a felt. In the component part a ', 1
The aqueous solution containing the pitch adhesion inhibitor was sprayed on the felt surface by the spray shower 20 at the location. Also, the component b '
In the above, an aqueous solution containing a pitch adhesion inhibitor was sprayed onto the felt surface by one spray shower 21. Then, in the constituent part c ', an aqueous solution containing a pitch adhesion inhibitor was sprayed onto the felt surface by one spray shower 22. Further, in the constituent part d ′, the aqueous solution containing the pitch adhesion inhibitor was sprayed on the felt surface by one spray shower 23. In FIG. 3, 2
4 is a suction box (suction dehydrator), 25 is a press roll, 26 is a center roll, 27, 28,
29 and 30 are hot water shower devices. In addition, the above spraying conditions are such that the addition amount of the pitch adhesion preventing agent is set to 0.1% of the whole aqueous solution.
005% and sprayed at a spray amount of 3 ml / m / min.

As a result, the top plate 2 of the suction box 24 shown in FIG.
The pitch adhered to 4a, causing the hair to depilate and causing trouble. However, when this pitch-adhesion inhibitor-containing aqueous solution was sprayed, there was almost no adhesion of the pitch to the top plate 24a. No troubles occurred.

Example 5 Example 4 except that the pitch adhesion preventive agent (m) shown in Table 1 was used.
Under the same conditions as above, a printing base paper was manufactured using a paper machine having the configuration shown in FIG.

As a result, the top plate 2 of the suction box 24 shown in FIG.
The pitch adhered to 4a, causing the hair to depilate and causing trouble. However, when this pitch-adhesion inhibitor-containing aqueous solution was sprayed, there was almost no adhesion of the pitch to the top plate 24a. No troubles occurred.

Example 6 Example 4 except that the pitch adhesion preventive agent (s) shown in Table 1 was used.
Under the same conditions as above, a printing base paper was manufactured using a paper machine having the configuration shown in FIG.

As a result, the top plate 2 of the suction box 24 shown in FIG.
The pitch adhered to 4a, causing the hair to depilate and causing trouble. However, when this pitch-adhesion inhibitor-containing aqueous solution was sprayed, there was almost no adhesion of the pitch to the top plate 24a. No troubles occurred.

[0052]

As described above, the pitch adhesion inhibitor of the present invention comprises a specific cationic condensate (component A), a cationic surfactant (component B) and a specific nonionic surfactant (component C). Containing pulp or paper,
It has an excellent effect of suppressing the occurrence of pitch obstacles against pitch obstacles in tools. By spraying the pitch adhesion preventive agent on papermaking machines and tools, the adhesion of pitch to papermaking machines and tools can be significantly suppressed. As described above, by using the pitch adhesion preventing method of the present invention, it is possible to suppress the rate of occurrence of breakage of papermaking equipment and tools due to the pitch adhesion, and it is necessary to remove the attached pitch in a short period of time. Although it was necessary to stop the operation and perform the cleaning in the operation of the papermaking machine, it is not necessary to stop the operation and perform the cleaning. Therefore, the pulp and paper products obtained by the method for preventing pitch adhesion of the present invention also have high practical value, such as improved quality.

[Brief description of the drawings]

FIG. 1A is a side view showing a machine used for a pitch adhesion prevention test, and FIG. 1B is a plan view thereof.

FIG. 2 is a schematic diagram showing a configuration of a paper machine for manufacturing a core base paper.

FIG. 3 is a schematic diagram illustrating a configuration of a paper machine that manufactures printing base paper.

FIG. 4 is a sectional view showing a suction box which is a component of the papermaking machine.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-8-337988 (JP, A) JP-A-55-45857 (JP, A) JP-A-5-263385 (JP, A) JP-A-8-337 260392 (JP, A) JP-A-55-103389 (JP, A) JP-A-3-69690 (JP, A) JP-A-7-305289 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) D21C 1/00-11/14 D21F 1/00-13/12 D21H 11/00-27/42

Claims (9)

(57) [Claims] 1. A pitch adhesion preventive comprising the following components (A), (B) and (C). (A) Condensate of dicyandiamide and polyalkylene polyamine. (B) a cationic surfactant. (C) Nonionic surfactant having an HLB of 9.0 to 18.0. 2. The polyalkylene polyamine used in the component (A) has 2 to 5 nitrogen atoms.
The pitch adhesion inhibitor described in the above. 3. The pitch adhesion inhibitor according to claim 1, wherein the number of nitrogen atoms in the polyalkylene polyamine used in the component (A) is three. 4. The cationic surfactant as the component (B) is at least one cationic surfactant selected from the group consisting of alkyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride and alkyldimethylethylammoniumethyl sulfate. The pitch adhesion inhibitor according to any one of claims 1 to 3. 5. The nonionic surfactant as the component (C) is at least one nonionic surfactant selected from polyoxyalkylene derivatives of aliphatic alcohols having 8 to 18 carbon atoms. 5. The pitch adhesion inhibitor according to any one of 4. 6. The nonionic surfactant as the component (C) is a polyoxyethylene derivative of an alkyl alcohol having 8 to 18 carbon atoms, and has an HLB of 11.0 to
The pitch adhesion inhibitor according to any one of claims 1 to 5, which is at least one nonionic surfactant selected from the range of 15.0. 7. The mixing ratio of the component (A) and the component (B) is as follows:
A component: B component = 1: 0.05 to 1: 2.5 by weight ratio
And the mixing ratio of the component (C) to the total amount of the components (A) and (B) is, by weight, (A component + B component): C component = 1: 0.5 to 1:10 The pitch adhesion preventing agent according to any one of claims 1 to 6, which is set in the range of: 8. An acidic substance having a molecular weight of 300 or less is blended as the component (D), and the blending ratio of the component (D) to the total amount of the components (A) and (B) is (A)
The pitch adhesion preventive agent according to any one of claims 1 to 7, wherein the component + B component): D component = 1: 0.1 to 1: 2.0. 9. A method for producing a pulp or paper, wherein at least a part of a papermaking machine which comes into contact with the raw material of the pulp or paper contains the pitch adhesion preventive agent according to any one of claims 1 to 8. A method for preventing pitch adhesion, which comprises spraying a solution.