JPS588199A - Treatment of fibrous structural material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] No. 4 and j! EKIIL< is a paper with excellent wet strength;
In particular, the purpose is to improve the wet strength of paperboard for liners or cores in the production of corrugated poles.

A known method for improving the wet strength of paperboard is to treat the paperboard with acrylic 7MiF-based polymers and glyoxol. In this method, the acrylamide polymer and glyoxol are treated in one step in the form of their reactants or atomized products, and then they are treated separately in two steps.
In either case, the anti-IF between the amiF group and glyoxol
It has the advantage that P is generated efficiently and extremely good #Ftk water resistance can be imparted to paper, and paperboard or waste paper can be easily recovered.

However, from 1k onwards, research conducted by Reisuri Myoku et al. revealed that this method had the problem of coloring the paperboard and reducing the product value, and that countermeasures were needed. .

Therefore, the present invention focused on glyoxylic acid or its IIK, which has a reaction behavior similar to that of glyoxydel, and attempted to solve this problem. It has been found that treatment with salt does not substantially cause paperboard discoloration and can also be expected to improve the wet strength of the paperboard. However, it is slightly inferior to glyoxol in terms of wet strength, so in order to improve it, K11t is used.
The next nine studies revealed that fiber S1-based structural materials such as paperboard were mixed with water-soluble polymers containing amino groups or imino groups, and glycol containing 0.1 to 9 glyoxol (based on pure content). - We have discovered the novel fact that when treated with oxylic acid or its salt, there is no fear of coloring of the treated product, and the wet strength is dramatically improved.
N stick. The present invention (K) is characterized by the use of glyoxylic acid or a salt thereof containing a specific glyoxol as a phantom component; the wet strength is insufficient when glyoxylic acid or a salt thereof is used alone. By using glyoxol in an amount of 0.1 to 9% by weight based on pure content, the wet strength can be greatly improved, and at the same time, coloring of the product can be almost prevented.

If 9 weight or more of glyoxol is used, as described above, the coloring will be strong and will be a practical problem.

It is important that the water-soluble polymer used in the present invention has an amino group or an imino group in the molecule, and only polymers having such functional groups react well with oxole. It can exhibit excellent wet strength. Such amino group- or imino group-containing water-soluble polymers include (meth)
Acrylic acid polymers are mentioned first. That is, poly(meth)acrylamide, (meth)acrylamide/(
Advantageously used are meth)acrylic acid (sodium) copolymers, (meth)acrylamide/(meth)acrylonitrile copolymers, or (meth)acrylic acid/(meth)acrylic acid/(meth)acrylic acid/(meth)acrylonitrile copolymers. It will be done. Also useful are vinyl acetate/(meth)acrylamide copolymers or parts thereof, or completely pycnic compounds, that is, (meth)acrylamide-modified polyvinyl alcohols.

Examples of water-soluble polymers other than those mentioned above include Maschinich-based cationic poly(meth)acrylamide, aminopolyamide 1, aminopolyamide F-modified poly(meth)acrylamide, and 5. Poly-Alanine, Polyethyleneimine, Aminopolyamide Equinox F phosphorus reactant, (Meta)
Examples include acrylamide/dimethylaminoethyl ethyl acrylate copolymer and Ehychlorhydrin F phosphorus reaction product, but these Kf! Not determined. Such water-soluble polymers may be used alone or in combination.

Although glyoxylic acid can be used as both the free acid and its salts, the use of salts is advantageous in preventing equipment corrosion. Preferred salts include sodium glyoxylate, sodium glyoxylate, calcicum glyoxylate, and calcicum glyoxylate. In carrying out the treatment method of the present invention, (1) an amino group- or imino group-containing water-soluble polymer and '1. ．． A method of treating paperboard by pre-mixing or reacting a glyoxyl cap or its salt containing a specific amount of glyodes.It is also possible to perform so-called one-step processing, but if the amount of the above mixed solution or reaction solution increases Since there is a risk that it may become sticky and interfere with uniform processing, the following two-stage processing is usually performed.

First, paper is treated with a water-soluble polymer containing amino or imino groups. - Such treatments include adding water-soluble polymers internally to the pulp during pulp beating, papermaking, or any other papermaking process, coating, spraying, or Any means can be applied, such as impregnation, so-called outside W&K.

It takes Jh! During processing, various sizing agents, fillers, pigments used in the paper manufacturing process, salts such as sulfuric acid, light bread, KFi, water resistance agents, plasticizers, antifoaming agents, release agents, etc. ! JN,
Of course, it is also possible to use six types of additives such as surfactants in combination. □ “The amount of water-soluble polymer used is approximately 0.1 to 50% of the original weight of the pulp when using the internal addition method, and 0.05 to 5% when using the external method.
It is preferable to adjust the amount to about the same amount as your back.

The well-treated paper is immediately dried with KTo or optionally dried and further treated with an aqueous solution of glyoxyl-containing salts containing glyoxol. Glyoxol and glyoxylic acid can be used in commercially available aqueous solutions or concentrated solutions, or even in powder form;
For application, a predetermined amount of glyoxal is mixed with an aqueous solution of glyoxyl shunmata kesono salt. The mixing ratio of glyoxal is generally 0.1 to 9% by weight as described above.The treatment method can be arbitrarily determined, such as coating method, impregnation method, spraying method, etc. Various additives used in industry may be used in combination. The amount of application of the aqueous solution is such that the total amount of glyoxyl and glyoxol is 0.1 to 1 on a solid content basis.
l is desirable.

If the coating weight is below the above lower limit, it is difficult to obtain sufficient cross strength, and if the coating weight exceeds the above upper limit, it is economically disadvantageous.

In carrying out the method of the present invention, the sand and target paper are mainly liners used in the production of corrugated poles, paperboard for cores, manila balls, white poles, etc., and are not necessarily limited to these. It can also be used to improve the wet strength of printing paper such as general wood-free paper and gravure paper.

The above explanation mainly focuses on the case of treating paper as a fiber-based structural material, but the treatment method of the present invention can also be used to treat paper as a fibrous structural material.
It can be applied to any materials such as fibers, textiles, non-woven fabrics, Zeiper boards, etc.

Next, the method of the present invention will be explained in detail by way of an example. Hereinafter, "part" or "chi" refers to #i, which refers to the limit amount of violet without sand.

Example 1 Beaten wet pulp (BKP, L:N-1:1, degree of beating 5
Polyacrylamide 1° water dispersion of f32)
S liquid is 1.2% in terms of solid content for pulp, and 10% sulfur band is 24% in terms of B type content for pulp.
9. Add W&, stir thoroughly, and make paper using a Tarapee standard machine.

After squeezing, a silver paper with a water content of 581 G, a basis weight of 80 F/j, and a polyacrylamide coverage of 1 yen (based on the dry pulp) was obtained.

Next, a glyoxyl-glyoxyl sodium mixed aqueous solution (glyoxol/glyoxyl sodium (weight ratio) - 0.08/1) having a concentration of 1 was applied to the silver paper using a size press method.

Drying was performed at 105° C. for 5 minutes to obtain a reinforced paper.

The obtained reinforced paper was exposed to 2G'CO* for 1 minute and 4
Time immersion I! After processing, the fracture length can be measured according to JISP-805, and the results are shown in the first barley.

In addition, as a control example, #! - In the case where the treatment was omitted (Control Example 1), in the case where the use of glyoxol was omitted and the treatment was performed with an aqueous solution of sodium glyoxylate (Control Example 2)
An experiment was conducted in accordance with Example IK in the case of using glyoxylic sodium trichum containing a large amount of glyoxal (Control Example S). The results are also shown in the first analysis.

1st Wheat Examples 2 to 15 An experiment was conducted according to Example 1 under the conditions shown in Table 82. The results are shown in 2nd *.

112 tables

Claims (1)

[Scope of Claims] 1. A fiber-based structural material, 11) a water-soluble polymer containing an amino group or an imino group, and 1) a glyoxylic acid containing 0.1 to 9 glyoxol by weight based on the pure content; A geological method for fibrous structural materials characterized by treatment with the salt. 2. Claim S No. 11 where the water-soluble polymer is an acrylamide polymer [described in J6! Method.