JP3136497B2 - Pitch adhesion inhibitor for papermaking process - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pitch for a papermaking process for reducing the obstacles caused by the adhesion of the pitch in the papermaking process, especially for the paper pulp manufacturing process, and for preventing the pitch from adversely affecting the paper quality. It relates to an anti-adhesion agent.

[0002]

2. Description of the Related Art Pulp slurries that have undergone a raw material preparation process go to papermaking, finishing, and processing processes. Among them, the process in which pitch adhesion trouble is likely to occur is the papermaking process, and is particularly concentrated on the wire part, the press part, and the dryer part. Conventionally, surfactants such as polyoxyethylene alkyl ether, polyoxyalkyl ether, sodium dialkyl sulfosuccinate, and sodium alkylbenzene sulfonate, and inorganic carriers such as talc and clay are used for the purpose of dispersing pitch particles, reducing the adhesiveness, and the like. It is used. However, papermaking requires many steps as described above, and various auxiliaries are added to change the composition of the pulp slurry, so that the properties of pitch also change.

[0003] Many pitch adhesion preventive agents for papermaking processes have been developed so far, but all of them cannot cope with such a change in the composition of the pulp slurry, and a sufficient effect of preventing pitch disturbance has been obtained. Absent. Also, as a recent trend,
There are types in which these surfactants and organic solvents are mixed. In this type, pitch particles are dissolved and dispersed in white water so that the pitch particles do not aggregate even after multiple steps. However, in fact, a part of the pitch dissolved in the organic solvent is absorbed by a portion such as a press felt which is in direct contact with the wet paper web, so that the adverse effect on the paper quality is inevitable. As a result, not only may the papermaking equipment and tools be damaged or the working environment deteriorate, but also the dissolved pitch returns to the papermaking system together with the recovered white water. This causes pitch disturbance.

[0004] As a method of preventing or reducing the pitch adhesion failure in the papermaking process, there are a method of mechanically removing pitch,
Addition of adsorbent inorganic fine powder to lose adhesiveness and make it into paper, add surfactant to promote dispersion of pitch particles and simultaneously reduce adhesiveness to prevent aggregation, There are known a method of paper-making and a method of dissolving the pitch with an organic solvent to remove the pitch out of the system. The pitch adhesion preventive agents used in the methods (1), (2), (3), (4), (4), (4) are often added after pulper, after refiner chest, mixing chest, machine chest and the like. As described above, conventionally, many pitch adhesion preventing agents take out pitch particles out of the system, and disperse them in the system.

[0005] Inorganic carriers have a dispersing and adsorbing effect, but on the other hand, they cause wear of beaters, refiners, wires, roll doctors and clogging of press felt, and their effects are weak unless they are added in several places. ,
There are drawbacks such as a large amount of drug required to prevent pitch disturbance. Also, the purpose of dissolving and dispersing pitch particles in pulp slurry by using an organic solvent and a surfactant in combination is to increase the recovery rate of water, accumulate dissolved pitch,
There remains a problem that the papermaking equipment and tools are damaged and the working environment is deteriorated, leading to unpredictable pitch disturbance.

[0006]

There are various substances that cause pitch adhesion failure. Normally, pitch particles are used for components containing raw wood, such as calcium resinate, calcium fatty acid, and polymer-unsaponifiable substances, as well as printing inks such as newspapers, magazines, and corrugated cardboard, and adhesives. They can be broadly classified into the substances that caused them. The present inventors have conducted various studies in view of the situation that could not be solved by the conventional technology,
The present inventors have found that a combination of saponin and a nonionic surfactant is effective as a pitch adhesion inhibitor for a papermaking process, and have completed the present invention.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to a pitch preventing agent for a papermaking process, comprising a combination of a saponin and a nonionic surfactant as an active ingredient. Saponin has an excellent biological activity and is effective in preventing pitch adhesion by itself, but has a surplus effect when used in combination with a nonionic surfactant.
In the present invention, the papermaking process means a raw pulp preparation process and a papermaking process. Also included are a collection system and a broke system in these steps.

The saponin used in the present invention may be a crude extract or a purified commercial product. Saponin is a group of glycosides distributed in plants that form a colloidal solution that foams remarkably like soap. Saponins are roughly classified into triterpenoids and steroids. Triterpenoid saponins are widely distributed in dicotyledonous plants in general, and especially in the arboraceae, legumes, horse chestnuts, and the genus
It is abundantly contained in plants of the family Scorpiaceae, Primrose family, Rubiaceae, Scrophulariaceae, Camellia family, Egonaceae family, Acalyptaceae family, and Papilionidae.

[0009] Steroidal saponins are widely distributed in the plant kingdom, and include Amaryllidaceae, Lily, Yamaceae, Nigaki, Legumes, Coconutae, Scrophulariaceae, Bromeliad,
Although contained in solanaceae and other plants, plants in the family Amaryllidaceae, lily and yam are particularly abundant. Saponin is a glycoside in which sugar is bonded to sapogenin, but since there are many types of sugar and sapogenin that make up saponin,
There are many saponins with different chemical structures due to these combinations. For this reason, it is difficult to purify individual saponin components, and only a part of the saponin components has been examined for their chemical structure and content. Saponin is produced by an extraction method, and soybean saponin obtained from soybean, Kiraya saponin obtained from the bark of a Kiraya tree, mukuroji extract powder obtained from the skin of mukuroji are commercially available. Saponin is a white to light brown powder. Saponin is water-soluble, foaming in aqueous solution, pH of 1% aqueous solution
Is 5-7. Saponin has biological activity and has been used as a medicine since ancient times. Oral toxicity to warm-blooded animals is extremely low.

The nonionic surfactant according to the present invention includes polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, a block polymer of oxypropylene and oxyethylene, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, Fatty acid monoglyceride, polyethylene glycol fatty acid ester, polyoxyethylene alkylamine and the like can be mentioned. The pitch adhesion inhibitor for the papermaking process of the present invention exhibits a surplus effect by combining saponin and a nonionic surfactant, and provides an excellent pitch adhesion prevention effect. In addition, as long as the effects of the present invention are not impaired, a bactericide, an antifoaming agent, a solvent and the like can be added in addition to the above essential components. The ratio of saponin to the nonionic surfactant is preferably 0.1 to 30 parts by weight, more preferably 2 to 20 parts by weight, based on 1 part by weight of the former.

The method for using the pitch adhesion inhibitor for the papermaking process of the present invention includes a method of directly adding it to the pulp slurry and a method of adding it to the felt in the press section of the papermaking process. In the former method, a sufficient effect is exhibited at 100 to 5000 ppm, preferably 300 to 1000 ppm, based on the pulp. It is desirable that the contact time between the pitch adhesion preventing agent and the mechanically pulverized pitch in the beating of the pulp or in a refiner is longer, but the optimum addition place can be selected according to the actual conditions. In the latter method, a sufficient effect is exhibited at 10 to 1000 ppm, preferably 100 to 600 ppm, with respect to water added to the felt. As a method of addition, by diluting with water and adding uniformly and continuously to the entire width of the felt by a sprayer or a shower, it can be added to the entire surface of the felt rotating at a high speed.

[0012]

【Example】

Example 1 A pitch sampled from a paper mill producing the core of a liner using waste corrugated paper as a raw material was extracted with a solvent. 0.5 g of this extract was dispersed in 100 ml of water to form a colloidal pitch. TAPPI paper pulp test method No. According to the pulp pitch wire mesh adhesion test method of No. 11, a pitch adhesion test was performed. The test temperature at this time was 40 ° C., the pH was 5.5, and the pitch extraction solvent was toluene. The reagent was added at 0.1% to the dispersion of the colloidal pitch, and the prevention effect was determined by the weight of the pitch attached to the wire mesh. The following reagents were used.

Kinds of saponins used S: Soybean saponin (reagent manufactured by Wako Pure Chemical Industries) S: Kiraya saponin (reagent manufactured by Wako Pure Chemical Industries) S: Mukuroji extract powder (manufactured by Maruzen Kasei) Non-ionic used Kinds of surfactant N: polyoxyethylene lauryl ether (Emulgen 147, manufactured by Kao Corporation) N: polyoxyethylene nonyl allyl phenyl ether (Aqualon RN20, manufactured by Daiichi Kogyo Seiyaku) N: block polymer of oxypropylene and oxyethylene (New Pole PE64, manufactured by Sanyo Chemical Co., Ltd.)

N: sorbitan monolaurate (Emazole L-10 (F), manufactured by Kao Corporation) N: polyoxyethylene sorbitan monolaurate (Reodol TW-L120, manufactured by Kao Corporation) N: glycerol monooleate (Kao Corporation) N: Polyethylene glycol monolaurate (Emanon 1112, manufactured by Kao Corporation) N: Polyoxyethylene lauryl amine (manufactured by Kao Corporation)
Amit 105)

Formulation of the product of the present invention (Experiment Nos. 1 to 9) Saponin 1.5 to 3.5% by weight Nonionic surfactant 14 to 20% by weight Antifoamer 0.5% by weight Water 76 to 84% by weight Comparative Example (Experiment Nos. 10 to 20): Use of a commercially available product as it is Experiment No. 21: No drug added Table 1 shows the composition of the reagent and the test results. The prevention rate (%) in the table was calculated by the following equation. Prevention rate (%) = (AB) × 100 / A A: Pitch weight (mg) when no drug is added B: Pitch weight (mg) when a drug is added

[0016]

[Table 1]

Example 2 A pulp slurry after passing through a screen was collected from a factory where the core of the liner was made from waste corrugated cardboard as a raw material.
0.01%, 0.0% of pitch adhesion inhibitor to pulp
5% and 0.07% were added. The same test as in Example 1 was performed for this. The pulp slurry temperature at this time is 40
° C, pH 4.7, pulp concentration 1%. The test results are as shown in Table 2. Experiment No. shows the same thing as Table 1. Experiment Nos. 2, 5, and 8 are the present invention, Experiment No. 11,
14, 16 and 21 show comparative examples.

[0018]

[Table 2]

Example 3 A used felt for newsprint was washed by spraying a pitch adhesion inhibitor at a concentration of 0.5 g per liter of shower water for 80 minutes. The shower water temperature at this time is 40
° C and the spray flow rate was ^2.5 cc / cm ² · min.
Next, the time required for 1 liter of water having a water temperature of 40 ° C. and a pH of 5.4 to pass through the felt was measured, and this time was regarded as water permeability. The water permeation at this time was performed under a reduced pressure of -50 mmHg, and a felt having a diameter of 25 mm was used. Further, the felt after the measurement of water permeability was subjected to Soxhlet extraction (5 hours) with ethanol / benzene (1: 1 weight ratio), and the pitch remaining ratio was determined when the amount of pitch extracted from the felt without additive was 100%. Table 3 shows the results. Experiment No. shows the same thing as Table 2.

[0020]

[Table 3] From the above test results, it was known that the pitch adhesion preventing agent for the papermaking process of the present invention exhibited a remarkable pitch adhesion preventing effect as compared with the comparative product. In this case, no adverse effect on the paper quality was observed.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D21C 9/08

Claims (1)

(57) [Claims] 1. A pitch adhesion inhibitor for a papermaking process, comprising a combination of a saponin and a nonionic surfactant as an active ingredient.