JPH01104892A - Pitch control agent and method - Google Patents

Abstract

PURPOSE: To obtain a pitch-controlling agent comprising an aggregate of an acid-treated material of an acid clay, with an aluminum salt, having a large oil absorption and specific surface area, further having extremely superior pitch-absorbing properties, and capable of extremely reducing a pitch trouble in paper mill. CONSTITUTION: The objective pitch-controlling agent is a reacted secondary aggregate of (A) an acid-treated material of an acid clay, with (B) an aluminum salt, and has >=70 ml/100 g oil absorption and >=130 m<2> /g specific surface area. Preferably, the controlling agent is added to a high density white water after treating the white water by a wood pulp-recovering apparatus to recover the wood pulp in a papermaking step to control the pitch without adding the controlling agent to the papermaking wood pulp. The papermaking white water or the high density white water with the added controlling agent is preferably used for the dilution when carrying out the defibration and dilution of spoilage generated at the papermaking step.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pitch control agent and a pitch control method.

[Conventional technology] Countermeasures against pitch trouble in the pulp and paper manufacturing process are as follows:
Although this is a long-standing issue in automotive equipment, countermeasures have changed with changes in raw materials, and countermeasures have been taken each time to suit the source of pitch, its properties, etc.

Pitch is a substance that inevitably enters paper mills, and is mainly brought in from wood chips, waste paper pulp, rosin sizing agents, etc., and some is removed from the system with wastewater, and some is also incorporated into paper. Cooking, beating,
It is accumulated in each process of paper making and circulated within the system. NM within this process! As the pitch increases, it aggregates due to pH fluctuations, reactions with calcium ions, shearing forces, etc., becomes large particles, and is incorporated into the paper, resulting in amber or black spots, making it extremely difficult to use as a product. This is a serious drawback.

Furthermore, the pulp processing equipment of each process, the wall of the pulp slurry storage chest, the wire on the paper machine, the press rolls,
Agglomerated pitch particles adhere to dryer rolls, blankets, canvases, etc., causing various problems. In particular, if this adhesion is significant during the papermaking process, it will become impossible to operate the papermachine.

Conventional countermeasures include, for example, ■ Strengthening the seasoning of raw material wood, ■ Strengthening the cleaning of raw material pulp, ■ Selection of raw materials with low pitch, ■ Suppression of foaming in raw material systems: white water, ■ Surfactants, and high water solubility. Molecular dispersants, starch, protective colloids such as gelatin, ethylenediaminetetraacetic acid (EDTA)
Methods such as adding , talc, etc. to a mixer have been adopted.

For example, ■ has the problem that logs must be stored for a long time after being felled for seasoning.

Furthermore, although seasoning reduces the tonality of the pitch, it may become more sticky than the pitch of unseasoned material, making it unsuitable for pip control. (2) has problems such as an increase in wastewater load and a decrease in the yield of raw material pulp. (2) limits the degree of freedom in selecting raw materials, and (2) invites the addition of a large amount of antifoaming agent, which often causes pitch trouble. All of the methods (2) are insufficiently effective, and among these, the addition of talc is the most commonly used.

However, in response to the increase in pitch caused by the deterioration of raw material quality in recent years, such as the use of tropical hardwoods with a high pitch content or the increased use of recovered paper pulp, we have been able to cope with the increase in pitch due to the deterioration of raw material quality in recent years, such as the use of tropical hardwoods with a high pitch content and the increase in the use of recycled paper pulp. Over time, the effect becomes saturated,
The current situation is that the problem has not been resolved.

Furthermore, in recent years, a proposal has been made in JP-A-59-105842 as a pulp pitch adsorbent for paper manufacturing with improved pitch adsorption performance of talc. This proposal is a pulp pitch adsorbent for papermaking that is made by mixing natural talc with a small amount of non-swellable fluorinated mica powder, and by adding a small amount of acidic transition metal salt to this, a pitch adsorbent with even higher performance can be created. We also suggest what you can get.

In addition to the above, it is conventionally known to use diatomaceous earth, silica, clay, bentonite, acid clay, etc. as pitch removers by adding them to pulp raw materials.

None of the above-mentioned measures are decisive for pitch control, and the development of effective pitch control agents is an urgent need for the entire industry.

[Problems to be Solved by the Invention] The purpose of the present invention is to apply pitch control to pulp and waste paper valve manufacturing processes, paper manufacturing processes, and white water treatment processes to address the above-mentioned increase in pitch due to deterioration of raw material quality in recent years. An object of the present invention is to provide an effective pitch control agent and a pitch control method.

The talc, silica, clay, bentonite, acid clay, etc. mentioned above are all pore or 2B.

It has a three-layer crystal structure and adsorbs pitch using its pores or relatively large surface area.

Among these, clay, bentonite, and acid clay have a silica-alumina-based two- or three-layer crystal structure, and usually have exchangeable metallic ions between the crystal layers, and bentonite can also adsorb water. It has a relatively hydrophilic surface.

On the other hand, talc has a three-layer crystal structure like acid clay, but since it is based on magnesium silicate, there is silica between the crystal layers.
It does not adsorb metal ions or water like alumina-based products, but adsorbs lipophilic bits on its relatively lipophilic surface, so it is used as a pitch control agent despite having a smaller specific surface area than silica-alumina-based products. There are many achievements.

As a result of a detailed study of the adsorption mechanism of PIP, the present inventors found that, although pitch is lipophilic, the finer the pitch particles in water, the greater the influence of charge on the pitch particles. If the silica-alumina system can attract pitch particles strongly in terms of electric charge, then it is possible to effectively utilize the relatively large surface area of the silica-alumina system to adsorb pitch compared to tar. I found out.

In other words, by focusing on the adsorption ability of metal ions in the crystal structure of acidic clay, we treated acidic clay with aluminum salt to adsorb polyhydric aluminum ions between the crystal layers, thereby reducing the amount of charged pitch particles in water. It was discovered that the pitch control effect could be greatly improved by increasing the suction force and utilizing the large specific surface area.

In addition, as a result of studies on pitch control methods, the present inventors have found that, in general, through the valve, waste paper pulp manufacturing process, and paper manufacturing process, the amount of pitch is determined by the amount of white water circulated through the valve, waste paper, or pulp raw material in the paper manufacturing process. Based on the fact that the white water accumulates and increases rapidly during the white water process, the most effective method for controlling the white water is to add the reaction secondary aggregate of the present invention to the white water that is recycled and reused in each of the above processes. Based on this knowledge, we have completed the present invention. For example, the inventors investigated the waste paper processing process in which the amount of pitch is expected to increase the most, and the results are as follows.

Figure 3 shows an example of a flow sheet for a general used newspaper paper deinking plant and the results of an investigation of the raw materials at various locations and the concentration of colloidal fine pips in white water (unit: pips/dX10b).

Figure 3 shows that fine pips in the waste paper processing process are more concentrated in the white water system that is circulated and reused than in the raw material system, and in this example, they are particularly concentrated in large amounts in the white water in front of the deinking tower. I understand that.

From this, it can be said that pitch removal by a floatator or enhanced cleaning, which is the mainstay of conventional pitch countermeasures, is insufficiently effective because it is carried out far from the point where waste paper big is most concentrated.

In addition, regarding the method of adding surfactants or conventional bid control agents such as talc to the raw materials fed into the paper machine, since the concentration of waste paper pitch is low, the frequency of contact between the chemicals and the pitch is low, and the paper machine also Other chemicals (such as sizing agents) in the papermaking surplus white water that is being sent come into contact with the pitch control chemicals and adsorb, resulting in a decrease in the amount of the pitch control chemicals that would normally come into contact with the waste paper pitch. Due to reasons,
Naturally, it is necessary to use a large amount of pitch control chemicals, and if the amount of tj used is small, the effect will be insufficient.

In the present invention, the site for adding the hip control agent of the present invention was determined for the above-mentioned reasons, and the pitch control agent of the present invention was added to the white water system that is recycled and reused, where the pitch control agent of the present invention is most concentrated in the waste paper processing process. By adding the agent, a greater pitch removal effect can be obtained compared to conventional methods.
It also has the advantage of requiring less chemicals. In the example of the flow sheet shown in FIG. 3 above, it is effective to add a pitch control agent to the white water tank (2), preferably to the white water tank (2).

As a result of investigating the pulp manufacturing process and the paper manufacturing process, the present inventors obtained the same findings as in the waste paper processing process, and added the pitch control agent of the present invention to the circulating white water of each process. This has led to the completion of the invention of a method for controlling the pitch of final paper products.

[Means for Solving the Problems] That is, the present invention is a reaction secondary aggregate of acid-treated acid clay and aluminum salt, and has an oil absorption capacity of 70 d/min.
It is a pitch control agent having a weight of 100 g or more and a specific surface area of 130 TIt/min or more.

Further, in the method of the present invention, in the papermaking process, a pitch control agent is added to high-concentration white water obtained by treating papermaking white water with a paper stock recovery equipment and recovering the paper stock, and the pitch control agent of the present invention is not added to the papermaking stock. Pitch control using a control agent is the best option.

Furthermore, after beating the valve, it is diluted with clear water or white water, and then in the process of adding chemicals and making paper, it is diluted with papermaking white water or high-concentration white water to which the pitch control agent of the present invention has been added, and it is made into paper as it is in the papermaking process. This is a bittentrol method using the bittentrol agent of the present invention.

Further, in the pitch control method using the pitch control agent of the present invention, papermaking white water or high-concentration white water to which the pitch control agent has been added is used for dilution when disintegrating and diluting the waste paper generated in the papermaking process.

Historically, in the valve manufacturing process, a pitch control agent is added to the white water discharged after cleaning, dedusting, and dehydrating the valve after cooking or bleaching, and the present invention is used for recycling in the process of dedusting and dewatering the valve. This is a pitch control method using a pitch control agent.

In addition, in the waste paper processing process, the pitch control agent of the present invention is added to waste paper white water that is discharged after disintegrating, washing, and dehydrating the waste paper, and the pitch control agent is recycled in the process of disintegrating, washing, and dehydrating the waste paper. This is a pitch control method based on

Furthermore, in the waste paper deinking process, after adding the deinking agent, when the ink is floated and collected by the floatator, the waste paper valve just before entering the flow cheater is generated in the final process of waste paper deinking with the addition of a pitch control agent. This is a pip-21 int L1 method using the pitch control agent of the present invention, in which pitch is diluted with white water and floated together with ink in a flow data is discharged from the system.

Furthermore, dilution with papermaking white water or high-concentration white water to which the above-mentioned pitch agent has been added, recycling of valve processing white water, recycling of waste paper processing white water, or white water generated in the final process of waste paper deinking. This is a two-point oil method using the pitch control agent of the present invention, in which dilution of waste paper bulbs is performed in parallel at two or more locations.

Although it is not clear why the pitch control agent of the present invention is so effective, the following reasons may be considered. In other words, the reason why talc-based pitch control agents are said to have a better control effect than inorganic powders such as kaolin and clay is that magnesium silicate-based talc is better than silica-alumina-based kaolin and clays. This is thought to be because the surface is lipophilic and easily adsorbs lipophilic bits, even though the specific surface area is small.

On the other hand, in the present invention, as the adsorption effect of vidge becomes finer in water, the influence of charge becomes stronger than lipophilicity. By focusing on talc and adsorbing poly61 aluminum ions to acid clay, the pitch suction force due to charge is dramatically increased, and the suctioned pitch is stably adsorbed with a specific surface area larger than that of talc. It is thought to have an excellent bidge control effect.

Examples of the aluminum salt to be reacted with the acid-treated acid clay (hereinafter referred to as activated clay) include aluminum sulfate, basic aluminum sulfate, aluminum chloride, basic aluminum chloride, aluminum nitrate, and basic aluminum nitrate.

The amount of aluminum salt added varies depending on the raw activated clay and aluminum salt, but is generally at least 4 parts by weight and at most 80 parts by weight per 100 parts by weight of activated clay. This reaction can be carried out by any means as long as water coexists in the system. For example, activated clay is made into an aqueous slurry, and an aluminum salt aqueous solution is added and mixed thereto. It is sufficient to add and mix at room temperature, but heating may be performed if necessary.

Alternatively, the reaction can also be carried out by adding an aqueous solution of aluminum salt to activated clay and kneading this solution.

Next, the reaction secondary aggregate is dried and heat treated, preferably at a temperature of 120° C. or higher and for a time of 2 hours or longer. The reason is that when drying and heat treatment are performed under these conditions,
This is because strongly bonded reaction secondary aggregates are formed, and these secondary aggregates are not destroyed even when a strong shearing force is applied.

Further, light pulverization and classification may be performed as necessary, and a ball mill, roll mill, jet pulverizer, etc. can be used as the pulverizer. As a classifier,
For example, there is a wind-stretch separator.

The pitch control agent of the present invention is produced by the reaction 2 of the acid-treated acid clay obtained as described above and an aluminum salt.
It is a secondary agglomerate with an oil absorption of 701d1100g or more and a specific surface area of 130Td/! Must be 7 or higher. If the oil absorption amount and specific surface area are small, the adsorption capacity of the bitge will be low, and the bitge control effect will be poor.

The pitch control agent of the present invention exhibits an excellent pitch adsorption effect when added to valve raw materials and white water.

In addition, the feature of the pitch control method using the pitch control agent of the present invention is that the secondary aggregate of the reaction between activated clay and aluminum salt of the present invention is added, and the manufacturing process of valves, deinked waste paper valves, and raw material preparation. The pitch control effect becomes remarkable by adding it to the white water in the paper manufacturing process such as paper production, paper making process, white water treatment process of paper making white water, diluting the paper stock with the white water, or recycling the white water.

Hereinafter, the place where the pitch control agent of the present invention is added and how to use it will be explained for each step with reference to the drawings.

FIG. 1 is a schematic diagram of the flow of the preparation and papermaking process.

In the papermaking process, the pitch control agent of the present invention is added to high-concentration white water (high-concentration white water digest shown in the figure), which is obtained by treating papermaking white water with a paper stock recovery equipment and recovering the paper stock content, to produce valve raw materials, etc. Used for dilution of

Addition of the pitch control agent to the above-mentioned highly concentrated white water involves blowing fine air bubbles into the white water, adsorbing and concentrating bitge into the air bubbles, and causing the pitch control agent of the present invention to be added to this white water mixture. The pitch, which had been increasing rapidly, decreased significantly. Preferably, the equipment used in this method is a LL floating type cell, such as the 'Crofta Super Cell manufactured by US-17 Shinari Co., Ltd.'.

In the preparation process, as shown in the figure, after the valve is beaten, a nice agent and other chemicals are added and sent to the paper making process. Use papermaking white water or highly concentrated white water. In this case, the pitch control agent added to the white water is diluted into the paper stock and is incorporated into the paper stock during the paper making process.

The papermaking white water or high-concentration white water to which the pitch control agent has been added is also used when disintegrating, diluting and covering the waste paper generated during the paper making and finishing processes using the illustrated waste paper pulper.

FIG. 2 shows an example of applying the present invention to a valve manufacturing process, and is a schematic diagram showing the flow of valve processing after bleaching a bleached kraft valve (BKP).

The bleached kraft valve slurry obtained from the bleaching process is washed with a washing machine, dust removed with a screen, and dehydrated with a dehydrator before entering the bleached valve chest to obtain purified bleached valves. The pitch control agent of the present invention is added to the pit of white water discharged from the dehydrator, and the white water added with the pitch control agent is used to dilute the valve raw material in the screen and dehydrator, and the pitch content in the white water and the valve is Pitch control is performed by adsorption.

FIG. 3 is a schematic diagram of the flow of the waste newspaper deinking treatment process. In the waste paper processing process, the pitch control agent of the present invention is added to the waste paper processing white water that is discharged after disintegrating the waste paper (white water tank ■ shown in the figure) after disintegration, washing, dehydration, and disintegration of the waste paper. used as circulating white water to be returned to the

In the waste paper deinking process, after adding I152 ink to the waste paper raw material, the ink is floated and collected in a floatator, and just before entering the floatator, it is diluted with white water generated in the final process of deinking at the waste paper valve. The pitch control agent of the present invention is added to the white water (white water tank (2) shown in the figure) generated in this final deinking step (dehydrator (2) shown in the figure). This allows the floatator to discharge the big particles that float together with the ink to the outside of the system.

As described above, the pitch control agent of the present invention is added to the highly concentrated white water obtained in the white water stock recovery equipment of the papermaking process, and the pitch control agent of the present invention is added to the dilution of beaten bulb with white water. Using papermaking white water or highly concentrated white water, adding the pitch control agent of the present invention to circulating white water in the valve manufacturing process and waste paper circulating white water in the waste paper processing process, and diluting before the 70-station in the waste paper deinking process, The pitch control method using the pitch control agent of the present invention, such as using the white water generated in the final deinking process to which the big control agent of the present invention has been added, can be performed at two or more locations in parallel.
It can have a great effect on controlling pitch spots on paper and major troubles in each process.

In the pitch control method using the pitch control agent of the present invention, the amount of secondary aggregates of the reaction between activated clay and aluminum salt added to the white water in each of the above steps is sufficient to be 0.5 to 5% by weight based on the solid content of the white water. be effective. As shown in the examples below, the adsorption performance is about 4 times better than that of conventional pitch control agents, so the same]
If the control effect is to be achieved, only about 174 m will be used. In addition, since the pitch control agent of the present invention is added in an amount of 0.5 to 5% by weight based on the paper stock content in white water, its use port is 15% by weight of white water based on the valve or paper stock solid content. If used, the fiber content of the valve or paper stock will be 0.07 to 0.751%, and compared to the amount of pitch control agent added to normal valve raw materials, the pitch control effect can be achieved at a little less than 176%. I can give it to you.

[Example] Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Oil absorption 182d/100SJ, specific surface area 110y4/9
Activated clay of 4.5% was weighed out and water of 25.5% and 9% was added to obtain a slurry with a concentration of 15% by weight. 1.44 kg (as solid content) of aluminum chloride aqueous solution (8β203 content 10%) was added to this slurry at room temperature with stirring F.
After reacting with stirring for an hour, use a blow dryer at a temperature of 130℃ for 4 hours.
After drying and heat treatment for a while, it was left to cool. This reactant is crushed,
A reaction secondary aggregate of the present invention was obtained. The oil absorption value in this reaction secondary aggregate was 110 d/100 SJ, and the specific surface area by BET method was 170 d/g.

Next, tropical hardwood chemical valves, softwood chemical valves, softwood mechanical valves, and deinked waste paper valves @ bottles at a ratio of 25:15:4
Mix at a ratio of 0:20, and add rosin sizing agent 51 (g).
/Bulb t and 'J/Bulb t were added and mixed with sulfuric acid band 20 to prepare a Bulb slurry having a concentration of 3% by weight. To this valve slurry, 1% by weight of the reaction secondary aggregate^ based on the valve solid content was added, and the mixture was stirred for 5 minutes. The pitch removal effect of adding this big control agent was evaluated by the following test method. The results are shown in Table 1.

pitch area Measure the pitch area according to JIS P8208.

Hemastometer with colloidal pitch scale of 50μm, size 22X30
Cover with a 11III cover glass, pour in this white water through a capillary tube from -1,H, use a microscope,
Count the number of colloidal pitches at 00x magnification1).

Divide this count number by the number of squares counted to obtain the average number of colloidal pinches per square, and from the formula C, 1cIj
The per-colloidal pitch number (P) was calculated.

P=ヱ芻] - ■ Average per second square of PC] 11 Idal pitch number d: Depth correction coefficient = 1.1 ■ Volume of liquid above second square Volume of liquid above second square is depth 0.1 # l, base area 250
Since it is 0μ, convert it to d, P = ”×Pc= Pcx 4.4x 1062
．． 5X 10' Comparative Example 1 In Example 1, talc (oil absorption m40dl 100g, specific surface area 107
The pitch area was measured in the same manner as in Example 1 except that rt/l was used.

Comparative Example 2 In Example 1, commercially available talc-based pitch control agent A (hereinafter abbreviated as commercial product A) was used instead of the reaction secondary aggregate of the present invention (oil absorption: 47 d/100 #, specific surface area: 16 g/g) The pitch area was measured in exactly the same manner as in Example 1, except for using the following.

Comparative Example 3 The pitch area was determined in exactly the same manner as in Example 1, except that activated clay (oil absorption ff 180 ml/1009, specific surface area 110 TIt/g) was used instead of the reaction secondary aggregate 4 of the present invention. was measured.

Comparative Example 4 In Example 1, the pitch area was measured in exactly the same manner as in Example 1, except that 0.3% of the reactive secondary agglomerate formula of the present invention was added to the valve solid content.

Comparative Example 5 The pitch area was measured in exactly the same manner as in Example 1, except that the reactive secondary aggregate of the present invention was not added.

The test results of Example 1 and Comparative Examples 1 to 5 are shown in Table 1.

Example 2 After preparing a valve slurry with a concentration of 3% in Example 1, this valve slurry was diluted with clear water to a concentration of 1% and stirred at a rotation speed of 11000 rpm for 10 seconds, and then at the same rotation speed. While stirring, the mixture was filtered through an 80-mesh wire to obtain white water with a concentration of 0.52% (hereinafter referred to as low-concentration white water, which corresponds to papermaking white water). To this low concentration white water was added the reaction secondary aggregate formula in an amount not shown in Table 2, and the mixture was stirred for 5 minutes. Thereafter, the pitch control 1 call effect was evaluated in exactly the same manner as in Example 1.

Comparative Example 6 In Example 2, the pitch control effect was evaluated in exactly the same manner as in Example 2, except that activated clay was added instead of the reactive secondary aggregate formula of the present invention.

Comparative Example 7 In Example 2, the pitch control effect was evaluated in exactly the same manner as in Example 2, except that a commercially available product was added instead of the reactive secondary aggregate formula of the present invention.

Comparative Example 8 Pitch in low concentration white water was measured in exactly the same manner as in Example 2, except that the reaction secondary aggregate 4 of the present invention was not added.

The test results of Example 2 and Comparative Examples 6 to 8 are shown in Table 2.

Add 1100 pp of cationic polyacrylamide based on the white water solid content to the low concentration white water (corresponding to papermaking white water) with a concentration of 0.52% in Example 2, blow in Katsuji water at 511/cd, and add bubbles to the top of the white water with a valve. agglomerated and floated layer (11
3%) was formed. Scoop out this layer and
% high concentration white water was obtained.

The reaction secondary agglomerate formula used in Example 1 was added to this highly concentrated white water in the amount shown in Table 3' relative to the solid content of the white water, and the test was conducted in exactly the same manner as in Example 1. are shown in Table 3.

Comparative Example 9 Table 3 shows the results of a test conducted in exactly the same manner as in Example 3 except that the reaction secondary aggregate of the present invention was not added.

Activated white clay 4.5? Aluminum sulfate aqueous solution (Af
203 content γ, 6%, S03 content 607.8%) 0.
9 Ky (solid content) was added and the drying and heat treatment conditions were 130° C. for 4 hours, but the same treatment as in Example 1 was performed to obtain zero reaction secondary aggregates. Oil absorption is 110ad
! /100g, and the specific surface area was 160ml/g.

This reaction secondary aggregate 0 was added to the temperature 3% high tide white water of Example 3, and the amount shown in Table 4 was added to the white water solid content, and the reaction secondary aggregate 6 of the present invention was added to ai! The high-concentration white water was added to the waste paper valve slurry collected from the waste paper pulper in the paper making process shown in Figure 1 separately from blue and white water at 15% of the solid content of the waste paper valve as white water solid content, and the mixture was added for 5 minutes. After stirring, the pitch area of the bulb was measured.

Comparative Example 10 For comparison with Example 4, diluted with high concentration white water was carried out in exactly the same manner as in Example 4 except that the reaction secondary aggregate e) of the present invention was not added to the high concentration white water. The pitch area of the subsequent valve slurry was measured.

The test results of Example 4 and Comparative Example 10 are shown in Table 4.

Figure 2 shows the bleached kraft valve (domestic needle 8170%,
In the process of cleaning (30% tropical hardwood) with a washing machine, removing dust with a screen, and dewatering with a dehydrator,
The reaction secondary agglomerate formula of the present invention is applied to bits of white water with a concentration of 0.02% discharged from a dehydrator, and the 5th
White water added in the amount shown in the table was used to dilute the valve raw material in the screen and dehydrator, and then the pitch area and colloidal bidge number of the valve at the outlet of the dehydrator were measured.

Comparative Example 11 In Example 5, the pitch area and colloidal bidge number of the valve at the outlet of the dehydrator were measured when the reaction secondary aggregate was not added.

The test results of Example 5 and Comparative Example 11 are shown in Table 5.

□ (Continued) ■ Example 6 In the white water tank (■) shown in the schematic diagram of the used paper processing flow in Figure 3, the liquid shown in Table 6 was added to the white water solid content in the reaction secondary aggregate, and the waste paper processing flow shown in the diagram was carried out. A deinking valve (hereinafter abbreviated as completed IR) was obtained. Thereafter, the pitch area and colloidal pitch number of the completed IP were measured in exactly the same manner as in Example 1.

In addition, as shown in Figure 3, the white water in the white water tank
0%) 80 parts by weight M and 20 parts by weight of -1-t paper leaflets were disintegrated with a pulper, dehydrated with a dehydrator ①, and then discharged.

Comparative Example 12 In Example 6, the pitch area and number of 10 idal pitches were measured in the same manner as in Example 6, except that the reaction secondary aggregates were not added to the white water tank (2). did.

The test results of Example 6 and Comparative Example 12 are shown in Table 6.

Example 7 The raw material mainly composed of old newspapers from Example 6 was subjected to the usual deinking process in the processing system shown in the flow diagram of Fig. White water tank■
), the direction of the reaction secondary aggregates of the present invention is relative to the solid content of white water,
The water shown in Table 7 was added and the white water was used to dilute the waste paper valve raw material in front of the floatator to obtain finished IP.

Thereafter, the pitch area and colloidal pitch number of the completed product [)] were measured in exactly the same manner as in Example 1.

Comparative Example 13 Completed [)IP obtained by processing in exactly the same manner as in Example 7 except that the reaction secondary aggregate was not added to the white water tank (■)
The number and area of pitches were measured.

The test results of Example 7 and Comparative Example 13 are shown in Table 7.

Example 8 Tropical hardwood chemical valves, I1 leafwood chemical valves, softwood mechanical valves, and 112 ink waste paper valves used as valve raw materials were subjected to the reaction secondary aggregation of the present invention shown in Example 1 in the circulating white water of each valve manufacturing process. It was produced by adding 4 times % of each material to the solid content of white water and circulating the white water (see Figures 2 and 3).

Next, after disintegrating and beating the tropical hardwood chemical valve, side confectionery chemical valve, softwood mechanical valve, and deinked waste paper valve, respectively, they were mixed in a ratio of 25:15:40:20 to obtain the reaction secondary aggregate of the present invention. Added i! at a concentration of 3%! =i'f
After diluting with grade A white water, filler (talc) 80Ky
/ Bulb t10 Gin sizing agent 5Ky/Bulb t, cadionic polyacrylamide, 0.5Kg/Bulb t, sulfuric acid band 40Ky/Bulb t were added to adjust the Bulb slurry, and this was passed through a fourdrinier paper machine at a paper speed of 500,771/min. The paper was made with The pitch area of the paper obtained by paper making was measured.

Note that high-concentration white water with a concentration of 3% containing the inside of the reaction secondary aggregate was obtained as follows. In Figure 1, papermaking white water with a concentration of 0.5% generated by a paper machine is led to paper stock recovery equipment, 90 ppm of cationic acrylamide is added, air is blown with a Crofter Super Cell (pressurized water 5 kg/cm ), and the white water is The agglomerated floating layer (white water scum concentration: 3%) of the bulb formed on the upper surface with bubbles is collected into a high-concentration white water chest equipped with a stirrer, and the reaction secondary aggregate of the present invention is added to the white water solid content. Continuously add so that it becomes 4% (9).

Comparative Example 14 Paper was made in exactly the same manner as in Example 8, except that the reactive secondary aggregate of the present invention was not added, and the pitch area of the resulting paper was measured.

The test results of Example 8 and Comparative Example 14 are shown in Table 8.

As explained in detail in Examples and Comparative Examples above, the pitch control agent of the present invention, when added to valve raw materials and white water, has a superior pitch removal rate than conventional big control agents (Example 1.2 Comparison) Examples 1 to 3, 6 to 8), and when the amount added is small, the removal effect deteriorates (Comparative Example 4).

One of the features of the present invention is that when the pitch codon roll agent of the present invention is added to high-concentration white water obtained by treating papermaking white water with paper stock recovery equipment, pitch in the white water is removed (Example 3, Comparative Example 3) Example 9).

Furthermore, the removal effect was observed even when used to dilute a waste paper bulb (Example 4, Comparative Example 10). In addition, even when added to the circulating white water in the valve manufacturing process, the pitch in the valve can be effectively removed (Example 5, Comparative Example 11).Furthermore, in the waste paper processing process, even when added to the circulating white water before deinking. (Example 6
, Comparative Example 12), even when added to the white water in the final step of deinking (Example 7, Comparative Example 13), the pitch of the completed deinking valve can be significantly reduced.

When the big control agent of the present invention is added to the valve process, circulating white water in the waste paper processing process, and highly concentrated white water in the papermaking process, and pip control is performed in parallel in each of these processes, the pitch can be significantly reduced compared to conventional methods. Paper of excellent quality is obtained (Example 8, Comparative Example 14).

As mentioned above, whether the pitch control agent of the present invention is added to either valve raw material or white water, the pitch control effect is far superior to that of conventional pitch control agents. As a method of using the pitch control agent of the present invention, it is better to add it to white water where the pitch tends to increase significantly, especially papermaking white water, to high concentration white water treated with paper stock recovery equipment than to add it to valve raw materials. 6 in that effective pitch control can be achieved with a much smaller amount of ingredients.
It has characteristics.

[Effects of the Invention] As detailed above, the pitch control agent and the pitch control method of the present invention are effective against the deterioration of raw material quality in recent years, such as the increased use of pitch-rich tropical hardwoods or waste paper valves. C was added in response to the increase in pitch.

The pitch control agent of the present invention is a secondary reaction agglomerate of acid-treated acid clay and aluminum salt, and has a large oil absorption gap and specific surface area, and has pitch adsorption performance that is significantly superior to that of conventional pitch control agents. It is. In addition, when using the pip control of the present invention, the valve,
By adding it to the white water that is recycled and reused in the manufacturing process of deinked waste paper valves and the white water treatment process, it absorbs the pitch in the white water that increases during the circulation of white water caused by the valve,
It significantly reduces pitch concentration during the manufacturing process of valves, waste paper valves, and paper manufacturing processes, and improves quality by removing pitch from the resulting valves and paper to a greater extent than when using conventional pitch control agents. can do.

Therefore, the present invention is a superior pitch control agent and big control agent method that can significantly reduce pitch troubles in valve and paper mills.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the flow of the preparation and papermaking process, Fig. 2 is a schematic diagram showing the processing flow of bleached pulp in the valve manufacturing process, and Fig. 3 is a schematic diagram showing the flow of the used newspaper PA ink process. be. Figure 1 Figure 2 Pulp bleaching process Figure 3

Claims (1)

[Scope of Claims] 1. Pitch control which is a reaction secondary aggregate of an acid-treated acid clay and an aluminum salt, and has an oil absorption of 70 ml/100 g or more and a specific surface area of 130 m^2/g or more. agent. 2. In the papermaking process, a pitch control agent is added to the highly concentrated white water obtained by treating the papermaking white water with a paper stock recovery equipment and recovering the paper stock, and the pitch control agent according to item 1 is not added to the papermaking stock. control method. 3 When disintegrating and diluting the waste paper generated in the paper making process,
2. The pitch control method using a pitch control agent according to item 1, wherein white water for papermaking or high concentration white water to which the pitch control agent has been added is used for dilution. 4. In the pulp manufacturing process, a pitch control agent is added to the white water discharged after washing, dust removal, and dehydration of the pulp after cooking or bleaching, and the mixture is recycled for use in the process of removing dust and dewatering the pulp. Pitch control method using pitch control agent. 5. The pitch according to paragraph 1, wherein a pitch control agent is added to the waste paper white water discharged after disintegrating, washing and dehydrating the waste paper in the waste paper processing process, and the pitch control agent is used for circulation in the process of disintegrating, washing and dehydrating the waste paper. Pitch control method using control agent. 6 In the waste paper deinking process, after the deinking agent is added, when the ink is floated and collected with a floatator, the waste paper pulp just before entering the floatator is mixed with white water generated in the final process of waste paper deinking with the addition of a pitch control agent. 2. The pitch control method using a pitch control agent according to item 1, wherein the pitch is diluted with ink and the pitch that floats together with the ink is discharged from the system using a floatator. 7 Dilution with white paper water or high concentration white water added with a pitch control agent, circulation of pulp processing white water, circulation of waste paper processing white water, and dilution with white water generated in the final process of waste paper deinking are carried out in parallel at two or more locations. A pitch control method using the pitch control agent according to any one of Items 2, 3, 4, 5, and 6.