JPH10140496A - Chemical for papermaking, papermaking and production of chemical for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a chemical for papermaking capable of improving yield and drainage property by adding to paper stock by subjecting a water-soluble cationic vinyl monomer or its mixed monomer to reverse phase emulsion polymerization and subjecting the resultant polymer to hydration. SOLUTION: A water-soluble cationic vinyl monomer or a mixture of the monomer with other monomer is subjected to water-in-oil type reverse phase emulsion polymerization in the presence of a chain transfer agent to afford cationic or amphoteric acrylamide-based polymer and the polymer is hydrated and diluted to a concentration added to paper stock to provide the objective chemical for papermaking, formed of particles having <=30μm particle diameter and having film-forming property. The chemical is mixed with the paper stock in the neighborhood of a fan pump inlet, the neighborhood of the inlet and/or outlet of centri-screen and the mixture is made into paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking method in a papermaking process, and more particularly, to a papermaking process in which a specific cationic or amphoteric acrylamide polymer flocculant is added to a stock and mixed. The present invention relates to a method for making paper or paperboard, which improves paper yield and / or drainage.

[0002]

BACKGROUND OF THE INVENTION In order to improve the disadvantages of the conventional polymer flocculants, crosslinked cationic, anionic and nonionic organic polymer compositions (European Patent No. 0,202,
780, JP-A-61-293510, JP-A-64-85199, and JP-A-2-21987.
And Japanese Patent Application Laid-Open No. 4-226102) have been proposed to be effective for various solid-liquid separations.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to improve a papermaking method in a papermaking process, and to provide a papermaking method for paper or paperboard which improves the yield and / or drainage. One of the objects of the present invention is to produce a high-quality paper by averaging the composition distribution in the thickness direction of the paper layer by using a method for improving the yield of fillers, etc. The advantage of reducing paper stock density and controlling the variation of paper making it easier to mass-produce paper of constant quality or extending the life of plastic wire The object of the present invention is to provide an effective papermaking method. Another purpose of the present invention is to improve drainage. The purpose of drainage improvement is generally to increase papermaking speed, but it is often used for the purpose of enhancing paper strength. That is, if the degree of beating of the pulp is improved, it is possible to increase the paper strength, but there is a disadvantage that the paper making speed is reduced. By using the method for improving drainage, it is possible to maintain the filtration speed and the drying speed of a wet paper web at the same level as pulp having a high degree of beating even for pulp having a high degree of beating. It is regarded as important as a papermaking method that enables the production of high-performance paper by making a stock using pulp with a high degree of beating without lowering the production speed. It is an object of the present invention to provide an effective papermaking method that achieves the above object.

[0004]

According to the first aspect of the present invention, a water-soluble cationic vinyl monomer represented by the following formula (1) or a monomer containing a mixture thereof is used as a chain transfer agent. After performing the reversed-phase emulsion polymer in the presence, it is made easy to hydrate, and in the state diluted with water to the concentration to be added to the stock, particles having a particle size of 30 μm or less are observed under a microscope,
A papermaking agent characterized in that it has the property of forming a continuous dried film when the diluted solution is applied to a glass plate and dried by heating at 105 ° C.

Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. )

[0005] The invention of claim 2 of the present invention is the papermaking agent according to claim 1, which is a retention aid for papermaking.

[0006] The invention of claim 3 of the present invention is the papermaking chemical according to claim 1, which is a drainage improver for papermaking.

According to a fourth aspect of the present invention, there is provided a diluting solution of the papermaking chemical according to claim 1 in the vicinity of the inlet of the fan pump, the vicinity of the centriscreen inlet and / or the vicinity of the centriscreen outlet in the papermaking process of papermaking. Is added and mixed to agglomerate the paper stock.

The invention according to claim 5 of the present invention is characterized in that (A) 5 to 99.9999 mol% of the total monomer, a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof:
(B) 0.0001 to 0.01 mol% of bifunctional monomer in all monomers, (C) 0 to 30 mol% of water-soluble anionic vinyl monomer or mixture thereof in all monomers , (D) a nonionic water-soluble monomer, (E) a chain transfer agent, (F) water,
(G) an oil consisting of at least one hydrocarbon, and (H) an inverse phase emulsion, that is, an amount effective to produce a water-in-oil emulsion, and at least one surfactant that is HLB. The components A) to (H) are mixed and stirred vigorously as needed to form fine monomer phase droplets in the oil phase, and then polymerized, mixed with a hydrophilic surfactant and diluted with water for use. And a method for producing a papermaking chemical.

Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. )

The invention according to claim 6 of the present invention is the process for producing a papermaking chemical according to claim 5, wherein the hydrophilic surfactant is a nonionic surfactant having an HLB of 9 to 15.

The invention of claim 7 of the present invention is characterized in that: (A) 5 to 99.9999 mol% of the total monomer, a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof:
(B) 0.0001 to 0.01 mol% of bifunctional monomer in all monomers, (C) 0 to 30 mol% of water-soluble anionic vinyl monomer or mixture thereof in all monomers , (D) a nonionic water-soluble monomer, (E) a chain transfer agent, (F) water,
(G) an oil comprising at least one hydrocarbon, and (H) an amount effective to produce a reversed-phase emulsion, ie, a water-in-oil emulsion, and at least one surfactant which is HLB. The components A) to (H) are mixed and stirred vigorously as appropriate to form fine monomer phase droplets in the oil phase, and then a polymerization operation is performed. Then, the surfactant and the organic solvent are removed, and the mixture is diluted with water. And a method for producing a papermaking chemical.

Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. )

The invention according to claim 8 of the present invention is the process for producing a papermaking chemical according to any one of claims 5 to 7, wherein the nonionic water-soluble monomer is (meth) acrylamide. .

According to a ninth aspect of the present invention, the water-soluble anionic vinyl monomer is (meth) acrylic acid. It is.

According to a tenth aspect of the present invention, the bifunctional monomer is N, N'methylenebisacrylamide or bifunctional monomer.
The method for producing a papermaking chemical according to claims 5 to 9, characterized in that it is hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethylammonium chloride].

[0014]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a papermaking agent used by adding to paper stock during papermaking in papermaking, and to improve the yield of filler and fine pulp on a wire, or the productivity of papermaking. The present invention relates to a drainage improver for improving the water content. These may be used alone or in combination with bentonite, colloidal silica, and an anionic polymer. A papermaking chemical having the properties described in claim 1 is obtained by the production method according to claims 5 to 10.

Specific examples of the water-soluble cationic vinyl monomer (A) represented by the formula (1) used in the present invention include tertiary salts and quaternary dialkylaminoalkyl (meth) acrylates. Ammonium salt, tertiary and quaternary ammonium salts of dialkylaminoalkyl (meth) acrylamide, tertiary and quaternary ammonium salts of dialkylaminohydroxyalkyl (meth) acrylate, tertiary salt of dialkylaminohydroxyalkyl (meth) acrylamide And quaternary ammonium salts or a mixture thereof. Among them, one selected from acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, dimethylaminopropylacrylamide hydrochloride or a mixture thereof is preferably used.

Specific examples of the bifunctional monomer (B) used in the present invention include N, N'-methylenebisacrylamide, N, N'-methylenebismethacrylamide,
Examples include divinyl compounds such as divinylbenzene, vinyl methylol compounds such as methylol acrylamide and methylol methacrylamide, vinyl aldehyde compounds such as acrolein, and mixtures thereof. Of these, N, N'-methylenebisacrylamide is preferably used. it can.

Specific examples of the water-soluble anionic vinyl monomer (C) used in the present invention include (meth) acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, vinylsulfonic acid, and styrenesulfonic acid. Acid, itaconic acid, maleic acid, fumaric acid, arylsulfonic acid and salts thereof, or mixtures thereof.
Among these, acrylic acid can be most preferably used.

Specific examples of the water-soluble nonionic vinyl monomer (D) used in the present invention include (meth) acrylamide, vinyl methyl ether, vinyl ethyl ether and mixtures thereof. Among them, acrylamide is most preferably used.

Specific examples of the chain transfer agent (E) used in the present invention include alcohol, mercaptan, phosphite, sulfite, and mixtures thereof. The kind and amount of the chain transfer agent (E) used in the present invention is such that the polymer has an appropriate molecular weight and a network structure,
It is selected so as to have the physical properties described in claim 1. In the polymer of the present invention, most of the ionic groups are colloidally detected while observing the particle state, and give a continuous film upon drying. If no chain transfer agent is used, the polymer becomes water-insoluble and the effect as a flocculant is reduced by half. If it becomes water-insoluble, a continuous film will not be obtained under the drying conditions described in claim 1.

Specific examples of the oil comprising at least one kind of hydrocarbon which is the component (G) used in the present invention include mineral oils such as kerosene, light oil and medium oil, and boiling points in the same range as these. Examples thereof include hydrocarbon-based synthetic oils having characteristics such as viscosity, and mixtures thereof.

The surfactant (H) used in the present invention is a nonionic surfactant having an HLB of 3 to 6,
Specific examples thereof include sorbitan monooleate, sorbitan monostearate, and sorbitan monopalmitate.

In the present invention, as the hydrophilic surfactant mixed with the polymer obtained by the water-in-oil emulsion polymerization, a cationic surfactant or a nonionic surfactant having an HLB of 9 to 15 is used. HLB1
0-14 nonionic surfactants are used. Representative examples of preferred nonionic surfactants include, for example, polyoxyethylene nonylphenyl ether. Unless a hydrophilic surfactant is mixed, a large amount of mamako is generated by a normal stirring device installed for dissolving a flocculant.

The amount of the bifunctional monomer (B) used in the present invention, for example, the ratio of N, N'-methylenebisacrylamide to the total amount of the polymerizable monomer is from 0.0001 to 0.0001.
0.01 mol%, preferably 0.0002 to 0.003
It is desirable to copolymerize in the range of mol%. 0.000
If it is less than 1 mol%, a sufficient network structure cannot be obtained, and excellent coagulation performance cannot be obtained. When the amount exceeds 0.01 mol%, the polymer becomes a water-insoluble polymer, and does not aggregate even when added to and mixed with the stock.

The polymer according to the present invention can be copolymerized by an essentially known polymerization method. For example, after mixing and emulsifying an aqueous solution containing a polymerizable vinyl monomer and a chain transfer agent and an organic dispersion medium containing a nonionic surfactant having an HLB of 3 to 6, in the presence of a radical polymerization initiator, Temperature 30 ~
A method for producing a water-in-oil cationic polymer emulsion by polymerizing at 80 ° C. is described in JP-A-61-236250, but this method is applied by changing the monomer composition by applying this method. The water-in-oil emulsion of the invention can be synthesized. A hydrophilic surfactant is added to this water-in-oil emulsion, mixed with water, phase-inverted to an oil-in-water emulsion, and used as a flocculant. Alternatively, it may be diluted with water after removing impurities other than the polymer by washing with acetone or the like to make it hydrophilic. The conditions for addition to the stock after dilution are not different from those of ordinary water-soluble polymer flocculants.

[0025]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist.

Synthesis Example 1 120.0 kg of isoparaffin having a boiling point of 190 ° C. to 230 ° C. and 7.5 kg of sorbitan monooleate were charged into a reactor equipped with a stirrer and a temperature controller. 165 kg of demineralized water and 28.9997 mol% of acryloyloxyethyltrimethylammonium chloride (AMC) (represented as about 29 in Table 1), 1 mol% of acrylic acid (AAC), 3 × 10 ^-4 methylene bisacrylamide (MBAA) % Monomer, acrylamide (AAM) 70 mol% monomer 200
Kg of the mixture was added, and the mixture was emulsified by stirring with a homogenizer. 200 g of isopropyl alcohol was added to the obtained emulsion, and after nitrogen replacement, 40 g of dimethylazobisisobutyrate was added to complete the polymerization reaction while controlling the temperature at 50 ° C., and then 7.5 kg of polyoxyethylene nonylphenyl ether was added. A sample (sample-1) (the coagulant of the present invention) to be added and mixed and subjected to the test was used.

(Synthesis Example-2) Acryloyloxyethyltrimethylammonium chloride (AMC) 28.998
Mole% (represented as about 28 in Table 1), acrylic acid (AA
C) 1 mol%, methylene bisacrylamide (MBA
A) 2 × 10 ^-3 mol%, acrylamide (AAM) 70
A sample to be subjected to a test in the same manner as in Synthesis Example 1 except that a mixture of 200 Kg of a monomer having a composition of mol% was used (sample-
2) (Aggregating agent of the present invention) was prepared.

(Synthesis Example-3) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.999
7 mol% (represented as about 50 in Table 1), acrylic acid (AA
C) 10 mol%, methylene bisacrylamide (MBA
A) 3 × 10 ^-4 mol%, acrylamide (AAM) 40
A sample to be subjected to a test in the same manner as in Synthesis Example 1 except that a mixture of 200 Kg of a monomer having a composition of mol% was used (sample-
3) (Aggregating agent of the present invention) was prepared.

(Synthesis Example-4) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998
Mole% (represented as about 50 in Table 1), acrylic acid (AA
C) 10 mol%, methylene bisacrylamide (MBA
A) 2 × 10 ^-3 mol%, acrylamide (AAM) 40
A sample to be subjected to a test in the same manner as in Synthesis Example 1 except that a mixture of 200 Kg of a monomer having a composition of mol% was used (sample-
4) (Aggregating agent of the present invention) was prepared.

(Synthesis Example-5) Acryloyloxyethyltrimethylammonium chloride (AMC) 89.999
200 kg of a monomer having a composition of 7 mol% (expressed as about 90 in Table 1), 3 × 10 ^-4 mol% of methylenebisacrylamide (MBAA) and 10 mol% of acrylamide (AAM)
A sample (sample-5) (coagulant of the present invention) to be subjected to the test was prepared in the same manner as in Synthesis Example 1 except that the mixture of the above was used.

(Synthesis Example-6) Acryloyloxyethyltrimethylammonium chloride (AMC) 89.998
Synthesis Example-1 except that a mixture of 200 kg of a monomer having a composition of 2 mol% (expressed as about 90 in Table 1), 2 × 10 ^-3 mol% of methylenebisacrylamide (MBAA) and 10 mol% of acrylamide (AAM) was used. A sample to be subjected to the test (Sample-6) (the flocculant of the present invention) was prepared in the same manner as described above.

(Synthesis Example-7) The reverse-phase emulsion polymer obtained in Synthesis Example-2 was subjected to polymer washing with acetone to remove oil, surfactant and water, and then dried to remove acetone. As a result, a sample (sample-7) (the coagulant of the present invention) composed of an easily hydrated powder to be subjected to the test was obtained.

(Synthesis Example-8) The reverse-phase emulsion polymer obtained in Synthesis Example-4 was subjected to polymer washing with acetone to remove oil, surfactant and water, and then dried to remove acetone. As a result, a sample (sample-8) (a flocculant of the present invention) composed of an easily hydrated powder to be subjected to the test was obtained.

(Synthesis Example 9) The reverse-phase emulsion polymer obtained in Synthesis Example-6 was washed with acetone to remove oil, surfactant and water, and then dried to remove acetone. As a result, a sample (sample-9) (the coagulant of the present invention) composed of an easily hydrated powder to be subjected to the test was obtained.

(Comparative Synthesis Example 1) Acryloyloxyethyltrimethylammonium chloride (AMC) 29 mol%, acrylic acid (AAC) 1 mol%, acrylamide (methylenebisacrylamide (MBAA) as a crosslinking agent) were not added. AAM) Synthesis Example-1 except that a mixture of 200 kg of monomer having a composition of only 70 mol% was used.
A sample to be subjected to the test (sample-10) was prepared in the same manner as in the above.

(Comparative Synthesis Example-2) Acryloyloxyethyltrimethylammonium chloride (AMC) 50 mol%, acrylic acid (AAC) 10 mol%, acrylamide (methylene bisacrylamide (MBAA)) was added without adding a crosslinking agent. AAM) Synthesis Example-1 except that a mixture of 200 kg of monomer having a composition of only 40 mol% was used.
A sample to be subjected to the test (Sample-11) was prepared in the same manner as in Example 1.

(Comparative Synthesis Example 3) Acryloyloxyethyltrimethylammonium chloride (AMC) 90 mol%, acrylamide (AAM) 10 without adding methylene bisacrylamide (MBAA) as a crosslinking agent
A sample to be subjected to the test (Sample-12) was prepared in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of the monomer having a composition of only mol% was used.

(Comparative Synthesis Example-4) Acryloyloxyethyltrimethylammonium chloride (AMC) 28.998 moles in the same manner as in Synthesis Example-2 except that polymerization was carried out without adding isopropyl alcohol as a chain transfer agent. % (Represented as about 29 in Table 1), acrylic acid (AAC)
1 mol%, methylene bisacrylamide (MBAA) 2
× 10 ^-3 mol%, acrylamide (AAM) 70 mol%
A sample (sample-13) to be subjected to the test was prepared using a mixture of 200 kg of the monomer having the composition of

(Comparative Synthesis Example-5) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998 mol was obtained in the same manner as in Synthesis Example-4 except that polymerization was carried out without adding isopropyl alcohol as a chain transfer agent. % (Represented as about 50 in Table 1), acrylic acid (AAC)
10 mol%, methylenebisacrylamide (MBAA)
A sample to be tested (Sample-14) was prepared using a mixture of 200 kg of monomer having a composition of 2 × 10 ⁻³ mol% and 40 mol% of acrylamide (AAM).

(Comparative Synthesis Example-6) Acryloyloxyethyltrimethylammonium chloride (AMC) 89.998 mol was prepared in the same manner as in Synthesis Example-6 except that the polymerization was carried out without adding isopropyl alcohol as a chain transfer agent. % (Represented as about 90 in Table 1), a sample to be tested using a mixture of 200 kg of a monomer having a composition of 2 × 10 ⁻³ mol% of methylenebisacrylamide (MBAA) and 10 mol% of acrylamide (AAM) (sample- 15) was made.

(Comparative Synthesis Example-7) In the presence of a chain transfer agent,
Acryloyloxyethyltrimethylammonium chloride (AMC) 28.998 mol% (indicated as about 29 in Table 1), acrylic acid (AAC) 1 mol%, methylene bisacrylamide (MBAA) 2 × 10 ^-3 mol%, acrylamide (AAM) Monomer 200K having a composition of 70 mol%
g of the mixture, a reverse-phase emulsion polymer was synthesized in the same manner as in Synthesis Example 2, and polyoxyethylene nonylphenyl ether as a phase inversion agent was added to the polymer without post-addition.
A sample to be subjected to the test (sample-16) was prepared.

(Comparative Synthesis Example-8) In the presence of a chain transfer agent,
Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998 mol% (represented as about 50 in Table 1), acrylic acid (AAC) 10 mol%, methylene bisacrylamide (MBAA) 2 × 10 ^-3 mol%, acrylamide (AAM) Monomer 200 having a composition of 40 mol%
Using the mixture of Kg, a reverse-phase emulsion polymer similar to that in Synthesis Example 4 was synthesized, and polyoxyethylene nonylphenyl ether as a phase inversion agent was added without post-addition to the polymer.
A sample to be subjected to the test (Sample-17) was prepared.

(Comparative Synthesis Example-9) In the presence of a chain transfer agent,
Acryloyloxyethyltrimethylammonium chloride (AMC) 89.998 mol% (represented as about 90 in Table 1), methylenebisacrylamide (MBAA) 2 × 1
0 ^-3 mol% of acrylamide (AAM) with a mixture of 40 monomer mole% composition 200Kg synthesized similar inverse emulsion polymerization product as in Synthesis Example 6, polyoxyethylene nonyl phenyl ether is a phase inversion agent Was prepared for the test (Sample 18) without post-adding to the polymer. The above is summarized in Table 1.

[0044]

[Table 1]

(Observation Result-1) Sample-1 to Sample-9 were diluted with tap water to a polymer concentration of 0.2% by weight with stirring using an actual screw-type stirring device (300 rpm), and 1 hour passed. When the thickened liquid was collected and observed with a microscope, it was found that all particles had a particle size of 30 μm or less (about 3 μm) on one surface
Particles were observed, and the diluted solution was applied to a glass plate and
When heated and dried at 5 ° C., a continuous dried film was formed. Further, when the ion equivalent value of this diluted solution was measured by colloid titration, the ion equivalent value was 85% or more of the theoretical value.

(Observation Result-2) As in Observation Result-1, Samples 7 to 9 in an emulsion state were diluted with tap water using a real stirring device so that the polymer concentration became 0.2% by weight. After 1 hour, the thickened liquid was collected and observed with a microscope. As a result, all of the liquids were homogeneous solutions and no particles were observed. Apply the diluent to a glass plate and apply 105 °
Upon heating and drying at C, a continuous dried film was formed.
Further, when the ion equivalent value of this diluent was measured by colloid titration, all the ion equivalent values were 100% of the theoretical values.

(Observation Result-3) In the same manner as in Observation Result-1, the emulsion sample-10 to sample-12 was diluted with tap water using an actual stirring device so that the polymer concentration became 0.2% by weight. After 1 hour, the thickened liquid was collected and observed with a microscope. Particles having a particle diameter of 30 μm or less (about 3 μm) were observed on one side, and the diluted liquid was applied to a glass plate and heated to 105 ° C. When heated and dried, a granular discontinuous dried film was formed. Further, when the ion equivalent value of this diluent was measured by colloid titration, all the ion equivalent values were 60% or less of the theoretical values. Observation results-
The water dilutions prepared in 1 to 3 were used in Examples of the effect test.

(Observation Result-4) In the same manner as in Observation Result-1, Samples 13 to 15 in an emulsion state were diluted with tap water using an actual stirrer so that the polymer concentration became 0.2% by weight. As a result, the emulsion did not disperse in water, the gel-like mass floated, and a uniform polymer diluent was not obtained. On the other hand, when vigorous stirring was performed with a magnetic stirrer on a beaker scale, the emulsion was dispersed in water, and a uniform polymer diluent was obtained without floating gel-like lumps. The effect test of Samples 13 to 15 was not performed due to poor solubility.

Example 1 Table 2 shows the results obtained by measuring the filler yield and the total yield using a brit type dynamic jar tester. The paper used for the test was talc 9
00 ppm, kaolin 500 ppm, pulp 4000p
pm, PH 6.0, CSF 300 ml high quality paper.
The procedure is as follows: 500 ml of the stock is charged into a brit-type dynamic jar tester, stirring is started at 1500 rpm, a 0.2 wt% polymer diluent is added, and after 30 seconds, a cock for collecting white water is opened, and a 150 mesh wire is connected. Drain the passed white water. The white water for the first 10 seconds was discarded, and then the white water for 30 seconds was collected and used for measurement, and the total yield and the incineration at 600 ° C. were determined for the filler yield.
The chemical addition amount is an addition amount per solid content with respect to paper amount.

[0050]

[Table 2]

(Example-2) The ash content of the paper was adjusted by a fourdrinier on-top type paper machine under the conditions of a stock PH of 8.1 to 8.3.
%, High-quality paper having a basis weight of 84.0 g / m ² was made. The filler composition is 80% light calcium carbonate and 20% talc. To the seed box, 5000 ppm of cationic starch (3 mol% of corn starch raw material) was added to the pulp.
It was added as a 15% water diluent, and the total yield and the filler yield were determined from the SS and ash of the flow box and the white water pit.
Table 3 shows the results. The chemical addition amount is an addition amount per solid content with respect to paper amount.

[0052]

[Table 3]

(Example-3) In performing a paper making test of a jute liner, productivity when a stock of pH 5.8 to 6.0 was used as a long net on-top former and the chemical-free time was set to 100. Table 4 shows the papermaking speed under each sample addition condition as a comparative index of. As for the polymer used, each sample described in Table 4 was added immediately before centriscreening with a 0.15% polymer dilution in water, and the results are shown in Table 4. The chemical addition amount is an addition amount per solid content with respect to paper amount.

[0054]

[Table 4]

[0055]

According to the papermaking method of the present invention, the yield of cellulose fiber and filler can be improved in the papermaking process, and the effect of increasing the papermaking speed is also recognized. On the other hand, when the crosslinking agent or the chain transfer agent is not added, the performance of the papermaking chemical is poor.

[Table-1]

Claims (10)

[Claims] 1. After subjecting a monomer containing a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof to an inverse emulsion polymerization in the presence of a chain transfer agent, In a state of being made hydratable and diluted with water to the concentration to be added to the stock, particles having a particle size of 30 μm or less are observed under a microscope, and the diluted solution is applied to a glass plate and heated to 105 ° C. A paper-forming agent having the property of forming a continuous dry film when dried by heating. Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. ) 2. The papermaking chemical according to claim 1, which is a papermaking retention aid. 3. The papermaking agent according to claim 1, which is a drainage improver for papermaking. 4. The papermaking process according to claim 1, wherein in the papermaking process of the papermaking, the diluting solution of the papermaking chemical according to claim 1 is added and mixed in the vicinity of the inlet of the fan pump, in the vicinity of the inlet of the centriscreen and / or in the vicinity of the outlet of the centriscreen. A papermaking method, characterized in that: 5. A water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof, wherein (A) 5 to 99.9999 mol% of all monomers. 0.000
1 to 0.01% by mole of a bifunctional monomer, (C) 0 to 30% by mole of a water-soluble anionic vinyl monomer or a mixture thereof in all monomers, (D) a nonionic water-soluble monomer Body, (E)
A chain transfer agent, (F) water, (G) an oil comprising at least one hydrocarbon and (H) a reverse phase or water-in-oil emulsion in an amount effective to produce an HL.
At least one type of surfactant B is prepared, and the above components (A) to (H) are mixed and stirred vigorously as needed to form fine monomer phase droplets in the oil phase, and then a polymerization operation is performed. A method for producing a papermaking chemical, comprising mixing a hydrophilic surfactant and diluting with water. Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. ) 6. The method according to claim 5, wherein the hydrophilic surfactant is a nonionic surfactant having an HLB of 9 to 15. 7. A water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof, wherein: (A) 5 to 99.9999 mol% of all monomers; 0.000
1 to 0.01% by mole of a bifunctional monomer, (C) 0 to 30% by mole of a water-soluble anionic vinyl monomer or a mixture thereof in all monomers, (D) a nonionic water-soluble monomer Body, (E)
A chain transfer agent, (F) water, (G) an oil comprising at least one hydrocarbon and (H) a reverse phase or water-in-oil emulsion in an amount effective to produce an HL.
At least one type of surfactant B is prepared, and the above components (A) to (H) are mixed and stirred vigorously as needed to form fine monomer phase droplets in the oil phase, and then a polymerization operation is performed. Then, a surfactant and an organic solvent are removed, and the resultant is diluted with water for use. Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. ) 8. The method for producing a papermaking chemical according to claim 5, wherein the nonionic water-soluble monomer is (meth) acrylamide. 9. The method for producing a papermaking chemical according to claim 5, wherein the water-soluble anionic vinyl monomer is (meth) acrylic acid. 10. The method according to claim 1, wherein the bifunctional monomer is N, N ′ methylenebisacrylamide or dihydroxypropylidene 1,
The method for producing a papermaking chemical according to any one of claims 5 to 9, wherein the bis ([Nacryloylaminopropyl) N, Ndimethylammonium chloride] is used.