JPH01246495A - Production of paper - Google Patents

Abstract

PURPOSE:To obtain paper outstanding in both formation and the respective yields of filler and fine structure, by incorporating a raw paper suspension with a cationic polyelectrolyte and a bacteria cellulose-opened product followed by papermaking. CONSTITUTION:A raw paper suspension is incorporated with (A) a cationic polyelectrolyte [e.g., cationic polyacrylamide, (epoxidized)polyamidepolyamine, with a molecular weight of >=100,000] and (B) a bacteria cellulose-opened product (e.g., obtained by mechanically opening cellulose, etc., produced by microorganisms) followed by papermaking, thus obtaining the objective paper. Preferably, the weight ratio A/B=0.05-10.0.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper In method. For more details, filler and fine lIl! Concerning a method for producing paper with excellent IH yield and formation.

(Prior Art) Usually, a stock suspension contains filler and fine fibers in addition to pulp fibers. Since the filler and fine fibers are smaller in size than the mesh size of the paper mesh, most of them flow out together with water during paper making. When the speed of the paper machine is low or when the basis weight of the paper being made is large, the extent of this loss is small and does not pose much of a problem, but as the speed of the paper machine increases or the weight of paper becomes lighter, filler and fine particles are lost. There is an increasing need to increase the yield of 11141 fibers.

A conventional method for improving the yield of filler and fine MraM is to add a polymer electrolyte alone or a combination of several types of polymer electrolytes with different ionic properties to a stock suspension. .

Also known is a technique of adding a cationic polymer electrolyte and an anionic inorganic substance.

[Problem to be solved by the invention]

In conventional methods, when paper is manufactured by dispersing filler in a stock suspension and adding polyelectrolytes alone or in combination with several types of polyelectrolytes with different ionic properties, compared to paper without the addition of polyelectrolytes, Although the yield of fillers and fine mIi improves,
Due to its strong cohesive force, the texture of the paper deteriorates.

Furthermore, if the number of claws of the polymer electrolyte is reduced in order to suppress strong cohesive force, the yield will decrease.

As described above, it is difficult to achieve both formation and yield by increasing the yield by using a single polymer electrolyte or by combining several types of polymer electrolytes with different ionic properties.

An object of the present invention is to provide a method for manufacturing paper from a stock suspension, which improves the yield without damaging the formation of the paper.

[Means to solve the problem]

The present inventors conducted research to solve the above-mentioned problems in producing paper from a stock suspension. As a result, it was discovered that by adding bacterial cellulose disaggregation product to paper stock together with a cationic polymer electrolyte, the yield could be improved while maintaining good formation, and the present invention was completed.

That is, the present invention is a method for producing paper from a paper stock suspension, which is characterized by adding a cationic polymer electrolyte and a bacterial cellulose disintegrate to the paper stock suspension, and making paper. .

The fine IItIi of the present invention refers to parenchyma cells contained in wood or valves! It refers to the fine particles that pass through an 80-mesh wire gauze among the pieces peeled off from the long fibers by beating etc. of III.

As fillers, fillers that can be used in paper such as talc, clay, titanium dioxide, precipitated calcium carbonate, ground calcium carbonate, activated clay, synthetic silicate, kaolin, calcined kaolin, and plastic pigments may be used alone or in combination. can do.

The bacterial cellulose disaggregation product of the present invention refers to cellulose produced by microorganisms and/or those containing heteropolysaccharides with cellulose as the main chain, and mono- or β-
It is obtained by mechanically defibrating a substance containing glucan such as 1,3β-1,2.

The constituent components of heteropolysaccharides other than cellulose are mannose,
These include hexoses, pentoses, and organic acids such as fructose, galactose, xylose, arabinose, rhamnose, and glucuronic acid.

The microorganism that produces bacterial cellulose is not particularly limited, but Acetobacter acetisubspice xylinum (Acetobacter aceti-
subsp, xylinum) AT CC108
21 or the same Bastourian (^, pasteuri)
an), RanCenS (A, ranCenS),
Sarcina Ventr
iCuli), Batatherium cygiloides (Bac
Bacteria that produce bacterial cellulose, such as Pseudomonas (Terium xyloides) and Pseudomonas bacteria, can be used.

To disintegrate bacterial cellulose, a device that applies mechanical shearing force, such as a rotary disintegrator, mixer, homogenizer, heater, refiner, etc., can be used.

The cationic polymer electrolyte in the present invention refers to the molecule ff
100,000 or more of cationic polyacrylic heptamide, polyamide polyamine, polyethyleneimine, epoxidized polyamide polyamine, cationic starch, cationic guar gum, etc. can be used.

The content ratio (A/B) of the cationic polymer electrolyte (A) of the present invention and the bacterial cellulose disaggregation product (8) is 0.0
It is preferably 5 or more and 10.0 or less.

When (A/B) is less than 0.05, the yield improvement effect is poor, and when (A/B) exceeds 10, the texture of the paper deteriorates.

The filler-added paper of the present invention may contain additives, dyes, coloring pigments, fluorescent agents, dry paper strength enhancers, etc., which are normally used in paper making, as necessary.

It is also possible to smear starch, polyvinyl alcohol, various surface sizing agents, etc. on the surface of the filler-added paper of the present invention.

[Effect]

By adding bacterial cellulose disaggregates and cationic polyelectrolytes to the paper stock suspension, fillers and fine fibers coagulate with bacterial cellulose, so they are efficiently retained on the valve taIll, improving yield. It is thought that this will maintain the yield even if the cationic polymer electrolyte is reduced, thereby improving the formation.

〔Example〕

EXAMPLES The present invention will be explained in more detail below with reference to Examples, but the present invention is not limited to these Examples in any way.

In the examples, the parts and percentages described are all based on M1 baseman.

(Preparation example of bacterial cellulose disintegration) Sucrose 5g/old, yeast extract 0.5g/dl, ammonium sulfate 0.5g/
dl, potassium hydrogen phosphate (KH2PO4) 0.3g/
Formerly, magnesium sulfate (M (JSo ・7H20) 0
．． 05g/old medium (pH 5,0) for 50s
Pour e into an Erlenmeyer flask with a capacity of 200Ilr1,
A culture solution was prepared by steam sterilizing at 20° C. for 20 minutes.

Next, this culture solution was grown on a test tube agar medium (pH 6, O>30°C for 30 days with a composition consisting of yeast extract 0.59/old, peptone 0.3 g/dl, and mannitol 2.5 g/old). Acetobacter aceti subspice xylinum (AT (, C10821) was inoculated with 1 platinum square each and cultured at 30°C.

When cultured for 30 days under the above conditions, a white gel-like film containing bacterial cellulose polysaccharide was formed on the upper layer of the culture solution.

After washing this cellulosic polysaccharide gel membrane with water, add 100 times its dry weight of water and mix using a mixer in 15. OOO
rpm for 10 minutes to prepare a 1.0% suspension of bacterial cellulose disintegration.

(Example 1) With a beater, the Canadian standard water level is 450 m1! We prepared hardwood craft valve slurry that had been beaten to a certain level. Separately, 2% of the bacterial cellulose disintegration material (B) of the preparation example was added to the solid m loss of a mixture of precipitated calcium carbonate, ground calcium carbonate, and tarri in a ratio of 2:4:4. , cationic starch (trade name: Cato 3210, manufactured by Tamago National Co., Ltd.) (A), which had been dispersed and mixed in water at a solid content concentration of 10%, was heated and dissolved in advance.
An amount equivalent to 2/1 was added and stirred at a ratio (A/B) to obtain a slurry of aggregates.

Next, the previously prepared valve slurry (valve solid content: 1
00 parts), 45 parts of the above aggregate was added as a solid content.

Furthermore, 0.2 part of an alkyl ketene dimer sizing agent (manufactured by Dick Vercules, Varcon W) was added in terms of solid content. This slurry was adjusted to have a solid content of 0.5%, and a paper weighing 60 g/foot was made using a Fourdrinier paper machine with a wire width of 500 m and a speed of 20 m/sec.

The yield is calculated by collecting the paper stock and white water inside the head box.
The yields of fiber and filler were determined from the amounts of each component contained therein using equations (1) to (3).

(Total yield) R (%) -(1--) xi 00・
・・・・・・・・・・・・(1) However, R-Total yield (%) A-Paper stock in head box 500m1! Amount of solids inside (9
) B = Medium solid ff1 (SF) 100 in white white water 500
... Old ... (2) However, R' - Filler yield (%) A' = Head box inner paper F1500d! Filler f inside
fi (g) B' = (7)till (!J) in 500 m of white water, however, R''-41 fiber yield (%) This sample was designated as sample number 1.

(Examples 2 to 6) In the same manner as in Example 1, Kabuon starch (A) and: 11
The mixing ratio (A/B) of the preparation with bacterial cellulose disaggregation material (B) is 0.02.0.05.0.2.10.20
In the same manner as in Example 1, the yield was confirmed and a sample with sample number 2.3.4.5.6 was obtained.

(Comparative Example 1) Instead of the aggregate of Example 1, precipitated calcium carbonate, ground calcium carbonate, and talc were used in a ratio of 2:4:4, respectively.
Make an aqueous dispersion with a solid content concentration of 10% by mixing in the proportion of
To the same valve slurry used in Example 1 (valve solids content is 100 parts), 43 parts were added, and then 2 parts of the same cationic starch as in Example 1 was added to the weight of the mixed filler.
%, and 0.2 parts solids (based on 100 parts bulb solids) of an alkyl ketene dimer sizing agent were added.

Then, the yield was confirmed in the same manner as in Example 1, and a sample No. 7 was obtained.

(Comparative Example 2) Similarly to Comparative Example 1, 43 parts (per 100 parts of valve solid content) of a filler dispersion containing precipitated calcium carbonate, heavy calcium carbonate, and tart were added to the valve slurry, and then 111 cases of bacterial cellulose disaggregation was added at 2% by weight of the filler, and an alkyl ketene dimer sizing agent was added at a solid content of 0.2% (based on 100 parts of valve solid content).
Part was added.

Then, in the same manner as in Example 1, the yield was confirmed and a sample No. 8 was obtained.

The above results are summarized in Table 1.

(Table 1) *Formation was visually compared for Samples 1 to 8.

Consider the results in Table 1.

The yield of normal cationic starch can be confirmed in Comparative Example 1.

On the other hand, in Comparative Example 2, which used only the bacterial cellulose disintegration product, the yield of filler valves and fine fibers was decreased, but the texture of the handsheet was improved.

However, in Examples 1 and 3 to 5, the yield was improved and the formation was also good. That is, a synergistic effect is recognized between the addition of the cationic polymer electrolyte and the bacterial cellulose disaggregate.

In Example 2, A/B is 0.02, which is a small amount of cationic starch, and the yield is slightly low. In Example 6, A/B was 20, the amount of bacterial cellulose disintegration was small, and the texture tended to be slightly inferior.

Therefore, from the results of Examples 1 to 6, the superposition ratio (A/B) of cationic starch (A) and bacterial cellulose disintegration product (B)
)G, to, 05LX, it is clear that it is preferable for fj of 10 or less.

〔Effect of the invention〕

The paper manufacturing method using a cationic polymer electrolyte and bacterial cellulose disintegration product as in the present invention is a paper manufacturing method that is excellent in both the yield of filler and fine AI miscellaneous material, and the formation. This is extremely superior compared to conventional technology that uses only cationic polymer electrolytes.

Claims (1)

[Claims] 1. A method for producing paper from a paper stock suspension, characterized in that a cationic polymer electrolyte and a bacterial cellulose disintegrate are added to the paper stock suspension to produce paper. Production method. 2. The method for producing paper according to claim 1, wherein the content ratio (A/B) of the cationic polymer electrolyte (A) and the bacterial cellulose disintegrate (B) is 0.05 or more and 10.0 or less.