TW201736560A - Contamination preventing composition - Google Patents

Abstract

An objective of this invention is to provide a contamination preventing composition capable of efficiently preventing pitch contaminate in drying part. The present invention provides a contamination preventing composition 1 for applied in a drying part D in a paper machine, and the composition contains a film forming agent and gelation agent, wherein, the film forming agent is an emulsion containing a water, a modified polysilicone and an emulsion agent, and the gelation agent is a compound represented by the following formula (1): [in formula (1), R1 is each independently a hydrogen atom, a hydroxyl group, a carboxylic group, or an alkyl group which may has a substituted group with a carbon number of 1 to 3, R2 is each independently a hydroxyl group or a carboxylic group, R3 is a hydrogen atom, a hydroxyl group or a carboxylic group, m is an integer of 1 to 5, n is an integer of 0 to 5].

Description

Pollution prevention agent composition

The present invention relates to a composition for preventing contamination, and more particularly to a composition for preventing contamination of pitch which can effectively prevent dry parts from being dried.

The papermaking step in the paper machine generally has the following portion: a net portion which carries the liquid in which the pulp is dispersed in water is carried in the net for papermaking, and is made into a wet paper by allowing the excess water to fall naturally; The wet paper is dehydrated by passing the wet paper through a pair of press rolls and pressing it with a pressure roller through a felt to transfer the moisture in the wet paper to the felt; a drying unit that causes the wet paper passing through the pressurizing portion to contact the heated cylinder to be dried to form a paper, and a reel part that takes the paper to a volume called a roll The stick of the spool.

However, the drying section is used for heating and drying the wet paper cylinder, a canvas for pressing the wet paper against the cylinder, a canvas roll for guiding the canvas, and for gently adjusting the dry and wet. A device such as a smoothness of paper and a half-dryer roll stack of paper thickness, and the surface of such devices has a problem of so-called adhesion of asphalt. When asphalt is attached to such devices, the paper is contaminated, which is a cause of a significant decrease in productivity.

On the other hand, a composition of a contamination preventing agent which can prevent asphalt contamination by being applied to a drying section is known as a composition of a silicone-based contamination preventing agent.

For example, in the case of a polyoxo-based pollution preventing agent composition, a contamination preventing agent composition containing a polyoxyalkylene compound having a predetermined chemical structural formula, wherein the polyoxyalkylene compound per one molecule is known The number of amine-based modifying groups is from 0.5 to 5 (for example, refer to Patent Document 1).

However, in the above-described contamination preventive agent composition, the area where the asphalt contamination can be prevented is limited to the portion where the contamination preventive agent composition is applied to the drying section. Therefore, for the drying section, it is necessary to apply the contamination preventing agent composition at several places.

In this regard, a contamination preventive agent composition containing a low molecular weight polyoxyalkylene compound having a predetermined chemical structural formula and a high molecular polyoxyalkylene compound having a predetermined chemical structural formula, wherein low molecular weight polyoxyl The dynamic viscosity of the alkane compound at 25 ° C is 10 to 300 mm ² /s, and the dynamic viscosity of the polymer polyoxymethane compound at 25 ° C is 40 to 90,000 mm ² /s, and the low molecular polysiloxane compound per The number of modified bases of one molecule is from 0.1 to 3.0, and the number of modified bases per molecule of the polymeric polyoxyalkylene compound is from 1.0 to 10, and the polyoxyalkylene unit in the low molecular polyoxyalkylene compound The number n of repetitions of the number of repetitions m and the polyoxyalkylene unit in the polymer polyoxyalkylene compound satisfies the relationship of 2 m≦n (for example, see Patent Document 2).

In the composition of the pollution prevention agent, on the dried portion to which the composition of the pollution prevention agent has been applied, the polymer polyoxyalkylene compound forms a film, and the other On the other hand, the low molecular weight polyoxyalkylene compound is transferred to the wet paper, transported by the wet paper, and transferred to the drying portion on the downstream side where the wet paper is guided, so that the dry portion can be applied to a wide range. The pollution prevention agent composition effectively prevents asphalt contamination.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4868628

[Patent Document 2] Japanese Patent No. 4868629

However, in the composition of the pollution prevention agent described in the above-mentioned Patent Document 2, the contamination preventing agent composition can be applied to the drying portion in a wide range, but the drying portion on the downstream side with respect to the wet paper operation may not be sufficient. Prevent asphalt pollution.

In other words, in the composition for preventing contamination as described in Patent Document 2, since the molecular weight of the low molecular weight polyoxyalkylene compound is small, it tends to penetrate into the interior of the wet paper when it is transferred to the wet paper. Therefore, even in the dry portion which is operated on the downstream side with respect to the wet paper, even if it is in contact with the wet paper containing the low molecular weight polyoxyalkylene compound, there is a disadvantage that a sufficient amount of the low molecular weight polyoxyalkylene compound cannot be transferred.

The present invention has been made in view of the above problems, and an object thereof is to provide a contamination preventing agent composition which can effectively prevent asphalt contamination in a drying section.

The inventors of the present invention have intensively studied to solve the above problems, and as a result, have found that the above problem can be solved by including a gelling agent having a predetermined structure in the composition of the contamination preventing agent, and the present invention has been completed.

The present invention relates to (1) a contamination preventing agent composition which is applied to a drying section in a paper machine, and the composition comprises a film forming agent and a gelling agent; wherein the film forming agent contains water and modified polyfluorene An emulsion of oxygen and an emulsifier, and the gelling agent is a compound represented by the following formula (1): [In the formula (1), R ¹ each independently represents a hydrogen atom, a hydroxyl group, a carboxyl group, or a hydrocarbon group which may have a substituent of 1 to 3 carbon atoms, and R ^{2 is} independently a hydroxyl group or a carboxyl group, and R ³ is a hydrogen atom, a hydroxyl group or Carboxy, m is an integer from 1 to 5, and n is an integer from 0 to 5.

The present invention is the contamination preventing agent composition according to the above (1), wherein n is an integer of from 1 to 5.

(3) The composition of the pollution prevention agent according to the above (1) or (2), wherein each of R ^{1 is} independently a hydrogen atom, a hydroxyl group or a carboxyl group, and at least one of R ¹ is a hydroxyl group.

The pollution prevention agent composition according to any one of the above aspects (1) to (3) wherein R ² is a hydroxyl group.

The pollution preventing agent composition according to any one of the above (1), wherein the modified polyfluorene has an amine group. The amine group is modified to form polyoxoxime, and the contamination preventing agent composition further contains a neutralizing agent for neutralizing the amine group modified polyoxynium, and the neutralizing agent is acetic acid or lactic acid.

The pollution prevention agent composition according to any one of the above aspects (1) to (5), wherein the number of hydroxyl groups in the gelling agent is more than the number of carboxyl groups in the gelling agent.

The contamination preventing agent composition according to the above (1), wherein the gelling agent is at least one selected from the group consisting of gluconic acid, malic acid, and citric acid.

The pollution prevention agent composition according to any one of the above aspects (1) to (7), wherein the compounding ratio of the gelling agent is 0.1% with respect to 10% by mass of the modified polyfluorene oxide. Up to 20% by mass.

The pollution prevention agent composition according to any one of the above items (1) to (8), wherein after being applied to the drying section, the wet paper is glued by contacting the drying section. And transferred to the wet paper.

The composition of the antifouling agent of the present invention contains a gelling agent having a predetermined structure in addition to the film forming agent containing the emulsion, and is applied to the drying portion and heated, and by using a relatively low temperature wet paper. Contact, and the composition of the anti-corrosion agent is cooled, and the gelling agent acts to gel it.

Here, although the reason why the contamination preventing agent composition is gelled by the gelling agent has not been determined, it is considered that the gelling agent is formed into a structure which easily forms an intermolecular hydrogen bond, and at the same time, the contamination preventing agent composition is cooled. The degree of freedom of the molecules of the gelling agent is limited, resulting in gelation. Also, the reason is not limited to this.

The contamination preventive agent composition reduces the fluidity of the contamination preventive agent composition by gelation, thereby preventing penetration into the interior of the wet paper.

Therefore, the composition of the pollution prevention agent of the present invention is such that the composition of the pollution prevention agent is applied to the drying portion which is the most upstream side with respect to the wet paper in the drying section, and the composition of the pollution prevention agent is dried from the upstream side. The portion is transferred to the wet paper, and is transferred from the wet paper to the drying portion on the downstream side, whereby a sufficient amount of the contamination preventing agent composition can be applied not only to the drying portion on the upstream side but also to the drying portion on the downstream side. As a result, asphalt contamination can be prevented against a wide range of dryer sections.

Further, in the composition of the pollution prevention agent of the present invention, since the composition of the pollution prevention agent is gelled, the modified polymerization composition is not limited as in the composition of the pollution prevention agent described in Patent Document 2 cited above. The molecular weight of oxygen or the like.

In the composition for preventing contamination of the present invention, when n is an integer of from 1 to 5, gelation can be promoted. That is, since R ² which is a hydroxyl group or a carboxyl group is surely formed, the gelling agent is liable to form intermolecular hydrogen bonds and promote gelation.

In the composition of the pollution prevention agent of the present invention, R ^{1 is} independently a hydrogen atom, a hydroxyl group or a carboxyl group, and when at least one of the R ¹ is a hydroxyl group, since the gelling agent easily forms an intermolecular hydrogen bond, the gel can be promoted. Chemical.

In the composition for preventing contamination of the present invention, when R ² is a hydroxyl group, since the gelling agent is more likely to form intermolecular hydrogen bonds, gelation can be further promoted.

In the composition of the pollution prevention agent of the present invention, when the modified polyfluorene-based amine group is modified with an amine group, the pollution prevention agent group When the product further contains a neutralizing agent for neutralizing the amine-based modified polyoxynium, since the modified polyoxygenated oxygen becomes a neutralized salt, the polarity of the modified polyfluorene oxygen itself can be improved. Therefore, the modified polyoxymethylene is reliably gelled by the gelling agent without being separated from the water.

Further, by selecting an acetic acid or a lactic acid having a carboxyl group or a hydroxyl group as a neutralizing agent to form an intermolecular hydrogen bond with the gelling agent, gelation can be further promoted.

In the composition for preventing contamination of the present invention, the number of hydroxyl groups in the gelling agent is preferably more than the number of carboxyl groups. At this time, since the gelling agent easily forms intermolecular hydrogen bonds, gelation can be further promoted.

In the composition of the pollution prevention agent of the present invention, when the gelling agent is at least one selected from the group consisting of gluconic acid, malic acid, and citric acid, the composition of the contamination preventing agent is surely gelled. Therefore, it is possible to surely prevent the asphalt contamination in the drying section in a wider range.

In the composition of the pollution prevention agent of the present invention, when the proportion of the gelling agent is from 0.1 to 20% by mass based on 10% by mass of the modified polyfluorene oxide, the effect of the gelling agent can be sufficiently exerted, and even if it is long The composition of the contamination preventing agent is stored, and separation or the like does not occur, and the storage stability is excellent.

In the composition for preventing contamination of the present invention, after the composition of the contamination preventing agent is applied to a predetermined portion of the drying portion, the wet paper is brought into contact with the predetermined portion, whereby the composition of the contamination preventing agent is gelated and The gelled soil contamination preventive composition is transferred to wet paper.

Then, by bringing the wet paper into contact with the drying portion on the downstream side, the contamination preventing agent composition can be transferred to the dry portion of the contact.

At this time, when the re-transferred drying section is a cylinder, since the cylinder is heated, the gelled contamination preventing agent composition is heated and liquefied, and dried to form a film. Further, even a dry portion other than the cylinder can be heated by frictional heat with the wet paper.

Therefore, the asphalt contamination in the drying section can be effectively prevented.

1‧‧‧Contamination inhibitor composition

1a‧‧‧gel

10, 11‧‧‧ cylinder

B‧‧‧Semi-dry calender rolls

C‧‧‧ polishing roller

D‧‧‧Drying Department

D1, D2, D3, D4, D5, D6, D7, D8‧‧‧ cylinder

K1, K2‧‧‧ canvas

KR‧‧‧canvas roller

KR1‧‧‧ Pull out roll

W‧‧‧wet paper

Fig. 1 (a) to (e) are explanatory views for explaining the action of the contamination preventing agent composition of the present invention.

Fig. 2 is a schematic view showing a drying portion using the contamination preventing agent composition of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings, as needed. Further, unless otherwise specified, the positional relationship such as up, down, left, and right is in accordance with the positional relationship represented by the drawing. Further, the size ratio of the drawings is not limited to the illustrated ratio.

By applying the contamination preventive agent composition of the present invention to the dryer section of the paper machine, it is possible to prevent asphalt contamination in the dryer section.

Here, the drying section includes a cylinder, a canvas, a canvas roll, a calender roll, a semi-dry calender roll, and the like.

The contamination preventive agent composition includes a film forming agent and a gelling agent.

The film forming agent is an emulsion comprising water, modified polyfluorene oxide and an emulsifier. That is, the film forming agent mixes the modified polyfluorene with water and uses milk The agent is emulsified.

Here, the modified polyfluorene oxide may, for example, be an amine-modified polyfluorene oxide, an epoxy modified polyfluorene oxide, a polyether modified polyfluorene oxide, an alkyl modified polyoxynium, a carboxyl modified polyoxyxene, or Epoxy/polyether modified polyfluorene and the like. Further, these modified polyfluorene oxides may be used singly or in combination of several kinds.

Among these, in terms of generality, the modified polyfluorene oxide is preferably an amine-based modified polyoxane.

When the modified polyfluorene oxide is an amine-based modified polyfluorene oxygen, since the composition of the pollution prevention agent becomes alkaline, the composition of the pollution prevention agent is further contained to neutralize the amine-based modified polyoxyl The agent is preferred.

At this time, since the amino group-modified polyfluorene oxide becomes a neutralized salt, the polarity of the amine-based modified polyfluorene oxygen itself can be improved. Therefore, the amine-based modified polyoxo group is surely gelled by the gelling agent without being separated from water.

Here, the neutralizing agent is not particularly limited, and examples thereof include acetic acid, malic acid, citric acid, and lactic acid.

Among these acids, the neutralizing agent is preferably acetic acid or lactic acid from the viewpoint of safety and general versatility.

Further, when the neutralizing agent is acetic acid or lactic acid, since the acid has a carboxyl group or a hydroxyl group in the molecule, it can form an intermolecular hydrogen bond with a carboxyl group or a hydroxyl group of a gelling agent to be described later, and can further promote gelation.

In the film forming agent, the emulsifier is not particularly limited, and a known nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, or the like can be used.

Among these, the emulsifier is preferably a nonionic surfactant.

The nonionic surfactant may, for example, be a polyoxyethylene alkyl ether, a polyoxyalkylene sulfide, a polyoxyethylidene ester, or a polyoxyethylene sorbitol. An anhydride mono-fatty acid ester, a glycerin mono-fatty acid ester or the like. Further, these nonionic surfactants may be used singly or in combination of several kinds.

Among these, in view of the emulsification stability of the modified polyfluorene oxide, the nonionic surfactant is preferably a polyoxyethylene ethyl ether, and is a polyoxyethylene group. More preferably, ether, polyoxyethylene ethyl undecyl ether, polyoxyethylene ethyl hexadecane ether or polyoxyethyl octadecyl ether.

In the composition for preventing contamination, the gelling agent is a compound represented by the following formula (1).

The structure of the formula (1) is as follows: the main chain system includes a carbon having a repeating number m and a carbon having a repeating number n, and the carbon of the repeating number m is bonded to a hydrogen atom, a carboxyl group, R ¹ (group) and R ³ ( The carbon of the repeat number n is bonded to R ² (base).

Here, the R ¹ systems are independent of each other. That is, when a plurality of R ¹ are contained in the molecule, the adjacent R ^{1 's} may be the same or different.

R ¹ each independently represents a hydrogen atom, a hydroxyl group, a carboxyl group, or a hydrocarbon group which may have a substituent of 1 to 3 carbon atoms.

Further, the substituent in the hydrocarbon group which may have a substituent in R ¹ is not particularly limited, and examples thereof include a halogen group, a hydroxyl group, an amine group, an imido group, a nitro group, an azo group, a pendant oxy group, and a carboxyl group. , phenyl, etc.

Among these groups, R ^{1 is} preferably independently a hydrogen atom, a hydroxyl group or a carboxyl group.

When R ¹ is a hydrogen atom, since the hydrogen atom does not become a steric effect, it does not hinder the intermolecular hydrogen bond between the molecules of the gelling agent.

Further, when R ¹ is a hydroxyl group or a carboxyl group, it itself forms an intermolecular hydrogen bond with a hydroxyl group or a carboxyl group of another molecule.

In this case, it is preferred that at least one of R ¹ is a hydroxyl group. In this case, since the intermolecular hydrogen bond is easily formed, gelation can be promoted.

In the formula (1), the number m of repetitions of the carbon atom bonded to R ^{1 is} an integer of 1 to 5.

When the number of repetitions m exceeds 5, when R ¹ is a hydrogen atom or a hydrocarbon group which may have a substituent, the hydrophobicity becomes high, and there is a disadvantage that the storage stability of the composition of the contamination preventing agent is lowered.

In the formula (1), the R ² systems are each independently. That is, when a plurality of R ² are contained in the molecule, the adjacent R ^{2 's} may be the same or different.

R ^{2 is} independently a hydroxyl group or a carboxyl group.

Among these groups, R ² is preferably a hydroxyl group. At this time, gelation can be promoted because the intermolecular hydrogen bond is more easily formed.

In the formula (1), the number n of repeating carbon atoms bonded to R ^{2 is} an integer of 0 to 5.

When the number of repetitions n exceeds 5, it is excessively gelled, so that it cannot be uniformly applied to the drying section.

Incidentally, when n is 0, the gelling agent becomes a compound represented by the following formula (2). Further, in the formula (2), R ¹ , R ³ and m are synonymous with R ¹ , R ³ and m in the formula (1).

In the formula (1), the repeating number n is preferably an integer of 1 to 5.

When the number of repetitions n is an integer from 1 to 5, gelation can be promoted. That is, since the gelling agent must have R ² which is a hydroxyl group or a carboxyl group, it is easy to form an intermolecular hydrogen bond and also promote gelation.

In the formula (1), R ³ is a hydrogen atom, a hydroxyl group or a carboxyl group.

Among these groups, R ³ is preferably a hydroxyl group or a carboxyl group. At this time, gelation can be promoted because the intermolecular hydrogen bond is more easily formed.

In the gelling agent, the number of hydroxyl groups is preferably more than the number of carboxyl groups. At this time, since the acidity does not become strong, and the gelling agent easily forms intermolecular hydrogen bonds, gelation can be further promoted.

Specifically, the number of hydroxyl groups is preferably 2 or more times the number of carboxyl groups, and more preferably 2 to 5 times. Moreover, when it exceeds 5 times, it is hard to confirm the improvement of the effect.

Specific examples of the gelling agent include organic acids such as gluconic acid, malic acid, citric acid, succinic acid, propionic acid, butyric acid (i.e., butyric acid), valeric acid (i.e., oxalic acid), and caproic acid. Further, these acids may be used singly or in combination of several kinds.

Among these, the gelling agent is preferably at least one selected from the group consisting of gluconic acid, malic acid, and citric acid, and more preferably gluconic acid. At this time, the contamination preventing agent composition can be surely gelled. And the pollution prevention agent group The preservation stability of the product is also excellent.

In the composition of the antifouling agent, the blending ratio of the gelling agent is preferably 0.1% by mass to 20% by mass, and more preferably 0.1% by mass to 5% by mass based on 10% by mass of the modified polyfluorene oxide.

If the proportion of the gelling agent with respect to 10% by mass of the modified polyfluorene is less than 0.1% by mass, when it is compared with the case where the blending ratio of the gelling agent is within the above range, it is difficult to say that the gelation is sufficient. Further, there is a disadvantage that the amount of the contamination preventing agent composition to be transferred is reduced. If the blending ratio of the gelling agent with respect to 10% by mass of the modified polyfluorene is more than 20 masses, when the blending ratio with the gelling agent is within the above range, the contamination may be prevented depending on the storage conditions. The composition of the agent gels, and it is difficult to say that it is excellent in preservation stability.

The anti-corrosion agent composition may also contain a chelating agent, a preservative, a dispersing agent, a viscosity adjusting agent, a solid lubricant, a wetting agent, a dustproofing agent, a releasing agent, an adhesive, a surface correcting agent, a cleaning agent, and a paper force. Additives such as a sizing agent, a yield improving agent, a water repellent, an oil repellent, an anti-slip agent, and a softener.

In the method for producing a contamination preventing agent composition of the present embodiment, first, an emulsion is prepared by adding a modified polyfluorene oxide and an emulsifier to water by a known method such as a vacuum emulsification stirring device.

Then, by adding a gelling agent to the emulsion, an additive is added as needed, and the mixture is stirred and mixed to obtain a contamination preventing agent composition.

The stirring and mixing can be applied to a hand blender, a homogenizer, and the like. Further, it may be dispersed by a dispersing machine such as a sand mill, a bead mill or a ball mill.

Thus, a contamination preventing agent composition is obtained.

Next, the case where the contamination preventing agent composition of the present invention is applied to a cylinder as a drying section will be described as an example to explain the action of the composition of the contamination preventing agent.

Fig. 1 (a) to (e) are explanatory views for explaining the action of the contamination preventing agent composition of the present invention.

As shown in Fig. 1(a), the contamination preventing agent composition 1 is applied to the cylinder 10.

At this time, since the cylinder tube 10 is a drying portion that dries the wet paper W, it is high in temperature. Therefore, the applied anti-corrosion agent composition 1 becomes a high temperature (about 65 ° C or more), and at the same time, a part of water is evaporated and concentrated. Further, the dryer portion other than the cylinder tube 10 is also heated to a high temperature due to friction caused by wet paper running.

Next, as shown in (b) of FIG. 1, the cylinder 10 is operated (rotated), and when the contamination preventing agent composition 1 is in contact with the wet paper W (about 30 to 40 ° C) whose temperature is lower than that of the cylinder 10, The side of the contamination preventing agent composition 1 which is in contact with the wet paper W is cooled and gelled to form a jelly 1a.

Then, as shown in (c) of Fig. 1, a part of the gel 1a composed of the contamination preventing agent composition 1 is transferred to the wet paper W.

At this time, since the contamination preventing agent composition 1 has become the gel 1a, it can be retained on the surface of the wet paper W to prevent penetration into the interior.

Further, in the cylinder 10, the residual contamination preventing agent composition 1 is film-formed to prevent asphalt contamination.

Then, the wet paper W transferred with the gel 1a is run to the downstream side.

Then, as shown in (d) of Fig. 1, when the gel 1a is transferred When the wet paper W comes into contact with the cylinder 11 on the downstream side, as shown in FIG. 1(d), the rubber 1a is heated by the cylinder 11 on the downstream side, and a part thereof is liquefied.

Thereby, the contamination preventing agent composition 1 is re-transferred from the wet paper W to the cylinder 11 on the downstream side. Further, at this time, the gel 1a is sequentially liquefied from the surface in contact with the cylinder 11 on the downstream side, and therefore not all of them are liquefied.

Then, by repeating this operation, the contamination preventing agent composition 1 is gradually transferred to the drying portion on the downstream side where the wet paper W is guided.

As described above, the contamination preventing agent composition 1 of the present embodiment is gelled by the contamination preventing agent composition 1 transferred to the wet paper W to form the gel 1a, so that the fluidity of the composition of the contamination preventing agent is lowered. It can prevent penetration into the inside of the wet paper W.

Further, for example, when the contamination preventing agent composition is applied to the drying portion on the most upstream side with respect to the operation of the wet paper W, not only the drying portion on the upstream side but also the drying portion on the downstream side can be applied in a sufficient amount. The composition of the pollution prevention agent.

As a result, asphalt contamination can be prevented for a wide range of dryer sections.

Next, a method of using the composition of the contamination preventing agent in the drying section will be described.

Fig. 2 is a schematic view showing a drying portion using the contamination preventing agent composition of the present invention.

As shown in Fig. 2, the contamination preventing agent composition is used in the drying section D.

The drying unit D is provided with: a wet paper W; for heating and drying the wet paper W a plurality of cylindrical cylinders D1, D2, D3, D4, D5, D6, D7 and D8 (hereinafter referred to as "D1 to D8"); pressing wet paper against the canvases K1, K2 of the cylinders D1 to D8; The canvas roll KR of the canvas K1, K2; the semi-dry calender roll B which gently adjusts the smoothness of the dried wet paper W and the paper thickness; and the calender roll C which adjusts the smoothness of the dried wet paper W and the paper thickness.

In the drying section D, the wet paper W is pressed against the surfaces of the rotating cylinders D1 to D8 by the canvases K1 and K2. Therefore, the wet paper W is attached to the cylinders D1 to D8 while being heated and dried.

Then, the wet paper W is held in the semi-dry calender roll B, and secondly, the density of the wet paper W is made high by the calender roll C.

In the method of using the composition of the pollution preventing agent, as shown in Fig. 2, the cylinders D1 to D8 of the drying section D, the canvas K1, K2, the semi-dry calender roll B, and the calender roll C are respectively indicated by an arrow A. The contamination preventing agent composition is applied to the position.

Further, the method of applying the composition for preventing the contamination is not particularly limited, and for example, a spraying method or a spraying method using a dispensing nozzle can be used.

When the contamination preventing agent composition is applied at the position of the arrow A, the respective devices are operated (rotated), and the moisture preventing paper composition is transferred to the wet paper as described above while guiding the wet paper.

Further, the composition of the contamination preventing agent is transported by the wet paper, and is transferred to the drying portion on the downstream side where the wet paper is guided.

Thereby, the contamination preventing agent composition can be integrally applied to each device to prevent asphalt contamination.

At this time, the amount of the contamination preventing agent composition to be dispersed is preferably 0.02 mg/m ² to 2.0 mg/m ^{2 in} terms of the amount of non-volatile matter of the wet paper relative to the passage area.

If the amount of dispersion is less than 0.02 mg/m ² , the composition of the contamination preventive agent is not sufficiently adhered to the surface of each device when compared with the case where the amount of dispersion is within the above range, and there is a possibility that the asphalt contamination cannot be sufficiently prevented. situation. Further, when the amount of the dispersion exceeds 2.0 mg/m ² , the composition of the contamination preventing agent may be a cause of contamination when compared with the case where the amount of dispersion is within the above range.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments.

In the composition of the contamination preventing agent of the present embodiment, the composition of the contamination preventing agent is applied to the drying portion, but it can be applied not only to the drying portion but also to the pressing portion or the winding portion.

[Examples]

Hereinafter, the present invention will be specifically described based on examples and comparative examples, but the present invention is not limited to the following examples.

(Examples and Comparative Examples)

10 parts by mass of the amine-modified polyfluorene oxide was mixed with a gelling agent in a mixing ratio shown in Table 1 below to prepare a sample A which was heated to 100 °C.

(Evaluation 1)

The dried paper was placed on a stainless steel plate that had been heated to 40 °C.

Then, 10 μL of the sample A was suspended from the upper side of the paper, and the time during which the sample A penetrated into the paper was measured. Also, it is visually judged whether or not it is infiltrated.

The results obtained are shown in Table 1. Also, the penetration time of the paper is as slow as possible.

(Evaluation 2)

To the sample A of Example 3 and Comparative Example 1, 90 parts by mass of water was added to prepare a sample B.

Then, the effect of the composition of the pollution preventive agent on the actual machine was investigated.

Specifically, while the paper machine is being operated, in the cylinders D1 to D8 shown in FIG. 2, the sample B is applied at the position of the arrow A by the scattering nozzle.

After 3 hours, the contamination status of the cylinder D2, the cylinder D4, and the cylinder D6 was visually confirmed.

The results obtained are shown in Table 2. In addition, in Table 2, "○" means a state in which no asphalt is contaminated, and "x" means a state in which asphalt contamination is confirmed.

From the above results, it is understood that the composition of the antifouling agent of the present invention containing a gelling agent is less likely to penetrate the paper when compared with the conventional antifouling agent composition not containing the gelling agent.

Further, as a result of the test using the actual machine, it was confirmed that the contamination preventive agent composition of the present invention can sufficiently prevent the asphalt contamination against the cylinder on the downstream side.

[Possibility of application in industry]

The composition for preventing contamination of the present invention is applied to a drying portion of a paper machine. According to the contamination preventing agent composition of the present invention, since the asphalt contamination in the dryer portion can be prevented, the productivity of the papermaking can be extremely improved.

1‧‧‧Contamination inhibitor composition

1a‧‧‧gel

10, 11‧‧‧ cylinder

W‧‧‧wet paper

Claims (9)

A pollution preventing agent composition which is applied to a drying section in a paper machine; the pollution prevention agent composition comprises a film forming agent and a gelling agent, wherein the film forming agent comprises water, modified polyfluorene oxide and an emulsifier The emulsion formed by the following formula (1): In the formula (1), R ¹ each independently represents a hydrogen atom, a hydroxyl group, a carboxyl group, or a hydrocarbon group which may have a substituent of 1 to 3 carbon atoms, R ^{2 is} independently a hydroxyl group or a carboxyl group, and R ³ is a hydrogen atom, a hydroxyl group or a carboxyl group. m is an integer from 1 to 5, and n is an integer from 0 to 5. The contamination preventive agent composition according to claim 1, wherein the n is an integer of 1 to 5. The composition for preventing pollution according to claim 1 or 2, wherein each of R ^{1 is} independently a hydrogen atom, a hydroxyl group or a carboxyl group, and at least one of R ¹ is a hydroxyl group. The contamination preventive agent composition according to any one of claims 1 to 3, wherein the R ² is a hydroxyl group. The pollution preventing agent composition according to any one of claims 1 to 4, wherein the modified polyfluorene oxide is an amine group-modified polyfluorene having an amine group, Further, the above-mentioned contamination preventive agent composition further contains a neutralizing agent for neutralizing the amine-based modified polyoxo, and the neutralizing agent is acetic acid or lactic acid. The contamination preventive agent composition according to any one of claims 1 to 5, wherein the number of hydroxyl groups in the gelling agent is more than the number of carboxyl groups in the gelling agent. The contamination preventive agent composition according to claim 1, wherein the gelling agent is at least one selected from the group consisting of gluconic acid, malic acid, and citric acid. The contamination preventive agent composition according to any one of claims 1 to 7, wherein the compounding ratio of the gelling agent is 0.1 to 20% by mass based on 10% by mass of the modified polyfluorene. The composition for preventing a pollution prevention agent according to any one of claims 1 to 8, after being applied to the drying section, is gelled by bringing the wet paper into contact with the drying section, and is transferred to The wet paper.