JPH0156193B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention aims to prevent pitch particles mechanically crushed during the paper manufacturing process from agglomerating, and to reduce the adhesion of pulp slurry containing pitch particles to machines, equipment, etc. that come in contact with the pitch particles. Regarding inhibitors. Surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, sodium dialkyl sulfosuccinate, sodium alkylbenzene sulfonate, etc., or inorganic carriers such as talc, clay, etc., are used for the purpose of dispersing pitch particles or reducing tackiness. It is already known to be used as However, papermaking involves many steps, and various auxiliary agents are added, which changes the composition of the pulp slurry and changes the properties of the pitch. Although many pitch adhesion prevention agents for paper manufacturing have been developed so far, none of them are able to cope with such changes in the composition of pulp slurry and have not achieved a sufficient effect of preventing pitch damage. In addition, a recent trend is to mix organic solvents with these surfactants to prevent the pitch particles from agglomerating, but in reality, some pitch particles dissolved in organic solvents are mixed with felt, etc. Since it is absorbed into areas that come into direct contact with the paper, it inevitably has an adverse effect on the paper quality. Furthermore, since the dissolved pitch returns to the papermaking system together with the recovered white water, the amount of pitch within the system gradually increases, causing serious pitch failure. There are various substances that cause pitch disorder. Normally, pitch particles are generated due to the involvement of raw wood components such as calcium resinates, calcium fatty acids, and unsaponifiable polymers, as well as printing ink components such as waste newspapers, waste magazines, and waste cardboard, adhesives, etc. It can be broadly divided into those generated by Among conventional pitch adhesion prevention agents, there are many types that take the pitch particles out of the system and those that disperse them within the system. Inorganic carriers have a dispersion adsorption effect, but
On the other hand, it has drawbacks such as abrasion of beaters, wires, etc. and clogging of felts, and the amount of chemicals required to prevent pitch failure is unsatisfactory. In addition, the use of organic solvents and surfactants in combination to dissolve and disperse pitch particles in pulp slurry has increased the recovery rate of water, resulting in the accumulation of dissolved pitch, paper manufacturing equipment, tools, etc. There is a risk of damage to the equipment, deterioration of the working environment, and even unpredictable pitch failures. The present invention eliminates these drawbacks and provides a paper-making product containing a combination of polyoxyethylene sorbitan fatty acid ester and a block copolymer of propylene oxide and ethylene oxide in a weight ratio of 95:5 to 5:95 as active ingredients. It is an anti-adhesion agent. Polyoxyethylene sorbitan fatty acid ester is generally commercially available and is represented by the following formula. In the formula, a, b, and c each represent the degree of polymerization of a polyoxyethylene group, and R represents an alkyl group. A block copolymer of propylene oxide and ethylene oxide is represented by the following formula. The average molecular weight of this compound is usually 1800-11000,
m is a number representing the degree of polymerization of propylene oxide, and the average molecular weight of this segment is 950 to 2,250; n is a number representing the degree of polymerization of ethylene oxide, and the proportion of ethylene oxide in the total molecule is 10 to 80%. Polyoxyethylene sorbitan fatty acid ester is not known as an anti-pitch adhesion agent, and according to experiments by the present inventors, when used alone, it has poor anti-pitch adhesion properties. On the other hand, block copolymers of propylene oxide and ethylene oxide have been known to have an effect of preventing pitch adhesion, but the effect is not satisfactory. As a result of our research, the present inventors have completed the present invention by discovering that when these two are used in combination, an unexpected synergistic effect results in an excellent pitch adhesion prevention effect. The block copolymer (compound) of polyoxyethylene sorbitan fatty acid ester (compound), propylene oxide, and ethylene oxide is 95:5~
A weight ratio of 5:95, preferably 1:0.1 to 10 is used. The pitch adhesion prevention agent of the present invention is 100 ppm to 5000 ppm, preferably 300 ppm to pulp.
It is fully effective with a usage amount of 1000ppm. It is preferable to add the agent during pulp beating or in a refiner during the papermaking process, so that the contact time between the pitch anti-adhesion agent and the mechanically pulverized pitch is longer. You can choose. It may be added separately from the compound. During the papermaking process, problems often occur due to foaming. It is preferable to use an antifoaming agent together with the compound. As the antifoaming agent, higher alcohol-based, hydrocarbon-based, silicone-based, etc. can all be used. The content of the antifoaming agent is usually 0.1 to 1 part by weight per 1 part by weight of the total weight of the antifoaming agent. Antifoaming agents are generally sparingly soluble, and some are insoluble in the compound and/or the compound. In such cases it is advantageous to add water to form an emulsion of the inhibitor. An elongation type pitch anti-adhesion agent has not been known so far. However, it is difficult to produce stable emulsions and is prone to oil separation and creaming. In addition, emulsions freeze at low temperatures due to the presence of water, which remains a disadvantage even after thawing. As a result of further research on this point, the present inventors found that when adding an antifoaming agent to a mixture with a compound to form an emulsion, adding a polysaccharide-based polymer compound (called xanthan gum) We have discovered that it is possible to formulate stable emulsions that cannot be obtained with polymers. In particular, stability is hardly affected by repeated freezing and thawing. Other water-soluble polymers e.g.
CMC has no effect at all. The amount of xanthan gum used is 0.1 to 0.5% based on the aqueous phase, and an appropriate concentration is determined depending on the content of the surfactant and antifoaming agent. The pitch adhesion inhibitor for papermaking of the present invention has the effect of preventing re-agglomeration of pitch particles that are mechanically crushed into fine particles during the papermaking process and temporarily dispersed in the pulp slurry. In addition, the formulation of the present invention, which is made into a stable emulsion by combining an antifoaming agent and xanthan gum, has a low viscosity and a specific gravity close to that of water, so it is extremely easy to handle, and furthermore, when added to pulp slurry, it can be quickly processed. Dispersion and dissolution occur, so
It also responds quickly to pitch particles. Example 1 Pitch collected from a paper mill that manufactures liner cores from waste corrugated paper was extracted with a solvent. 0.5 g of this extract was dispersed in 500 ml of water to make a colloidal pitch, and according to the pulp pitch wire mesh adhesion test method of J.TAPPI Paper Pulp Test Method No. 11,
A pitch adhesion test was conducted. The test temperature at this time was 40
℃, PH5.5, Pitzchi extraction solvent is toluene.
Add the test drug to the colloidal pitch dispersion.
0.1% was added, and the prevention effect was judged by the weight of the pitch wire mesh attached. The drugs listed in Tables 1 and 2 were used as the test chemicals.

【table】

【table】

【table】

[Table] Table 3 shows the composition of the test drug, and Table 4 summarizes the test results. As the compound, the following commercial product manufactured by Kao Soap Co., Ltd. was used. Monolaurate: Rheodol TW-L120 Monopalmitate: Rheodol TW-P120 Monooleate: Rheodol TW-O120 Tristearate: Rheodol TW-S320 The compounds include the following propylene oxide and ethylene oxide blocks manufactured by Sanyo Chemical Industries, Ltd. A polymer was used.

【table】

【table】

[Table] Pitch adhesion weight without drug addition
(mg)
Example 2 Pulp slurry after passing through a screen was collected from a factory that manufactures liner cores using waste corrugated paper as raw material, and a pitch anti-adhesion agent was applied to the pulp.
Added 0.01%, 0.05%, 0.07%. Regarding this, a test was conducted in the same manner as in Example 1. At this time, the pulp slurry temperature was 40℃, PH4.7, and pulp concentration was 1%.
It is. The test results are shown in Table 5.
The test numbers are the same as in Table 3.

[Table] From the above test results, it was found that the pitch adhesion prevention agent for paper manufacturing of the present invention exhibits a remarkable pitch adhesion prevention effect compared to the comparative product. In this case, no adverse effect on paper quality was observed at all.

Claims (1)

[Scope of Claims] 1. An anti-pitch adhesion agent for papermaking containing as an active ingredient a combination of polyoxyethylene sorbitan fatty acid ester and a block copolymer of propylene oxide and ethylene oxide in a weight ratio of 95:5 to 5:95. 2. Paper manufacturing characterized by using as an active ingredient a combination of polyoxyethylene sorbitan fatty acid ester and a block copolymer of propylene oxide and ethylene oxide in a weight ratio of 95:5 to 5:95, and further using an antifoaming agent in combination. Pitch adhesion prevention agent. 3 A combination of polyoxyethylene sorbitan fatty acid ester and a block copolymer of propylene oxide and ethylene oxide in a weight ratio of 95:5 to 5:95 is used as an active ingredient, and an antifoaming agent and a polysaccharide-based polymer compound are also used in combination. A pitch adhesion prevention agent for paper manufacturing, which is characterized by: 4. The pitch adhesion preventing agent for paper manufacturing according to any one of claims 1 to 3, characterized in that the pitch adhesion preventing agent for paper manufacturing is an emulsion.