JPS58109698A - Papermaking pitch adhesion preventing agent - 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 The present invention relates to a pitch adhesion inhibitor for paper manufacturing for preventing pitch failure in the paper manufacturing process.

Various pitch disturbances occur in the paper pulp manufacturing process. Pitch is resin and other sticky substances contained in the papermaking process, and it aggregates at various points in the papermaking process, staining tools, causing pitch spots, reducing product quality, and having a negative impact on sheet formation. This may cause paper to run out.

The substances that cause pitch vary depending on the type of pulp material. In domestic pine wood, which is the raw material for sulfide pulp, the pitch content is composed of fatty acid calcium, resin acid calcium, and unsaponifiable matter, and this problem has been solved to some extent by excessive injection of sulfate.

Douglas fir, which is an imported chip, contains many unsaponifiables.
Even with kraft cooking, a large proportion of pitch remains in the pulp, resulting in pitch failure.

Southern woods such as lauan and rubber trees contain several times as much pitch as Douglas fir, and their ingredients are mainly comprised of highly sticky unsaponifiable polymers. They also remain in the pulp, causing pitch problems that are different from conventional ones, such as difficulty in bleaching and deterioration of weather resistance. Even after deinking treatment is applied to used newspapers and magazines, resin from printing ink and spine remains as pitch, and resin from adhesive tapes and adhesives remains in old cardboard, causing new pitch problems. ing.

Conventionally, it has been proposed to add polyethylene glycol nonylphenyl ether to prevent such pitch disorders, but this is not always satisfactory, and it remains to be seen that a drug that can effectively prevent pitch disorders can be developed. desired.

This invention was made in response to the above demands, and by using a polymer containing polyalkylene glycol mono(meth)acrylate as a constituent unit, it is possible to effectively prevent pitch disturbances in the paper manufacturing process. It is an object of the present invention to provide a pitch adhesion inhibitor for paper manufacturing that can prevent the adhesion of pitch.

This invention contains the following (4) and (B) as structural units, and has a number average molecular weight of 5. This is a papermaking pitch anti-adhesion agent containing a polymer having ODD to ioo and ooo.

(g) D general formula % formula % (where R is a hydrogen atom or a methyl group, m is an integer of 2 to 4, n is 2 to 20, oxyalkylene group is 1 or 2
4 or more types of polyoxyalkylene glycol monoacrylate or polyoxyalkylene glycol monomethacrylate units represented by
0-100% by weight.

(B): 0 to 60% by weight of one or more other ethylenically unsaturated monomer units copolymerizable with the structural unit of (4).

[In formula 13, the number of carbon atoms represented by CmH2mO is 2 to
Examples of alkylene oxides in No. 4 include ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran. Among these, one type may be added alone or several types may be co-addition polymerized; In this case, random polymerization or block polymerization may be used, and in the case of block polymerization, the order of addition does not matter.

n represents the average number of moles of these alkylene oxides added, and is selected between 2 and 20. If it is less than 2 moles, the water solubility of the copolymer will be low, and if it exceeds 20 moles, a large amount of unreacted substances will remain during copolymerization.

CI) compounds include polyoxyethylene glycol mono(meth)acrylate, polyoxypropylene glycol mono(meth)acrylate, polyoxybutere/glycol mono(meth)acrylate, polyoxytetramethylene glycol mono(meth)acrylate,
Polyoxyethylene oxypropylene glycol mono(
meth)acrylate, polyoxyethyleneoxybutylene glycol mono(meth)acrylate, polyoxyethyleneoxytetramethylene glycol mono(meth)acrylate, polyoxypropyleneoxybutylene glycol mono(meth)acrylate, polyoxypropyleneoxytetramethylene glycol mono(meth)acrylate meth)acrylate, polyoxobutyleneoxytetramethylene glycol mono(meth)acrylate, polyoxyethyleneoxypropyleneoxybutylene glycol mono(meth)acrylate, polyoxyethyleneoxypropyleneoxytetramethylene glycol mono(meth)acrylate, polyol Examples include polyoxyethylene oxybutylene oxytetramethylene glycol mono(meth)acrylate, polyoxypropylene oxybutylene oxytetramethylene glycol mono(meth)acrylate, polyoxyethylene oxypropylene oxybutylene oxytetramethylene glycol mono(meth)acrylate, and the like.

These compounds of formula 13 can be obtained, for example, by single or co-addition polymerization of ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, etc. to hydroxyalkyl mono(meth)acrylate.

Other ethylenically unsaturated monomers that are constituent units of (B) include ethylene, imbutylene, butadiene, diisobutylene, styrene, α-methylstyrene, p-methyl-α-methylstyrene, acrylonitrile, and vinyl acetate. , glycidyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2- Examples include hydroxypropyl (meth)acrylate, cyclohexyl (meth)acrylate, acrylamide, N-methylolacrylamide, (meth)acrylic acid and its salts.

The polymer 1 which is a component of the pitch adhesion inhibitor for paper manufacturing of the present invention is a homopolymer of a compound of formula CI) having a number average molecular weight of 5,000 to 1'OD, 000 or other ethylenically unsaturated monomers. It is a copolymer with 60% by weight or less.

The proportion of ethylenically unsaturated monomer in the copolymer is 60
If it exceeds % by weight, the water solubility may be lost or the pitch adhesion prevention effect may be poor.

The polymerization reaction to obtain the polymer of the present invention is carried out using a polymerization initiator in an organic solvent at a reaction temperature of 40 to 180°C, preferably 60 to 100°C.
The time period is preferably 1 to 20 hours. In this case, it is also possible to use a small amount of a chain transfer agent if necessary.

The above organic solvents include -, methanol, ethanol, n
Examples include -i lobanonyl, isopronominol, n-butanol, di-butanol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol moptyl ether, dimethylformamide, dimethyl sulfoxide, acetonitrile, acetone, and methyl ethyl ketone. These organic solvents are used in an amount of about 10 to 200 parts by weight per 100 parts by weight of the total monomers.
0 parts by weight, preferably 50 to 1000 parts by weight.

As a polymerization initiator, garlic zoyl sulfoxide, methyl ethyl ketone boron oxide, cumene hydroz oxide,
Di-tert-butyl duloxy:'', ino-butyroyl peroxide, tert-butyl chloride, dicumyl peroxide, abbisisobutyronitrile, etc. 001 to 10 parts by weight, preferably 0.05
Use 5 to 5 parts by weight.

Examples of mercaptans that can be used as chain transfer agents include dodecyl mercaptan and octyl mercaptan, and disulfides include bis-(hydroxyethyl) disulfide.

Diphenyl disulfide, bis-(2-ethylhexyl) disulfide, etc. The amount of these chain transfer agents used is 0.5 to 5 parts by weight of the total monomer ICl0.
Use 0 parts by weight.

The above polymerization reaction has a number average molecular weight of 5,000 to 100 as measured by gel permeation chromatography.
,000.

If the number average molecular weight is less than 5,000, the pitch adhesion prevention effect is poor, and '100. When the ODD is exceeded, the solubility in water becomes poor.

The polymer obtained in the above manner dissolves very well in water, alcohols, glycols, and other organic solvents. Even if it is difficult to dissolve in water, it can be made into an aqueous solution using a water-compatible solvent such as alcohols or glycols.

The polymer of the present invention is used as a pitch adhesion inhibitor for papermaking by adding it directly or by dissolving it in the above-mentioned solvent to a desired system. The pitch adhesion inhibitor for papermaking of the present invention is one of the above polymers.
Although only one type can be used as a component, several types may be mixed together, or other agents such as pitch adhesion prevention agents or adjuvants may also be mixed.

The amount of the pitched valve stopper of the present invention used is 0.001% by weight or more, preferably 0.005 to 0.1% by weight, based on the polymer. The addition location may be any location where the nopulp slurry before papermaking is stirred, and in particular, when added to a mixer/gute est, machine chest, etc., sufficient stirring and mixing can be achieved. in this case,
It is preferable to add it after diluting it with water or the like because it can be uniformly dispersed.

The pitch adhesion inhibitor of the present invention can disperse pitch in pulp slurry to prevent pitch from agglomerating, thereby preventing pitch from adhering to wires, felts, and the like. Therefore, it is possible to effectively prevent the adhesion of pitch that occurs in a paper making system using waste paper and logs as raw materials, and it is possible to reduce the number of times of washing and improve the quality of the product. In addition, when the polymer is nonionic, there is an effect that it does not affect the performance of correction for cationic properties such as a paper strength agent and a water resistance improver.

Next, examples of the present invention will be described.

Example 1 Pitch collected from a system in which kraft paper is made using kraft ξ lupus as a raw material is extracted with a solvent, and this extract is
．． 5F was suspended in 500 ml of water, and the suspension was tested with and without drug addition J, TAPPI
A pinch adhesion test was conducted in accordance with Paper Pulp Test Method Kei 11's pulp pitch wire mesh adhesion test method, and the chemical was evaluated based on the amount of pitch adhering to the wire. The test temperature at this time was 4
0°C, p) 15, the organic solvent is toluene. The test drugs are shown in Table 1, and the test results are shown in Table 2. For comparison, the results of testing polyethylene glycol nonylphenyl ether, which is commonly used as a pitch anti-adhesion agent, under the same conditions are also listed.

Table 2 ″ ・ ' 8 i 46 294 l Example 2 Pitch collected from a system in which toilet bars ξ- were made from recycled magazine paper was subjected to the same conditions as in Example 1 (
However, the results of evaluation at pH 7) are shown in Table B.

Example 3 In a system in which an exterior liner was made from old corrugated paper, pitch adhered to wires and felt, impeding productivity. Therefore, when 0.03% (based on pulp) of the present invention product 7 used in Example 1.2 was added, the amount of pitch adhesion decreased and the number of paper cuts with the wire decreased from 9 times/day to 1 time/day. did. Also, the number of times the felt is washed is 6.
It decreased from 0.5 times/day to 0.5 times/day. As a result, the amount of cleaning agent used was reduced to 1/6, and the production amount increased by 20 inches. On the other hand, the addition of the product of the present invention did not reduce the effects of other internal additives such as a reactor water quality improver, nor did it affect the paper quality.

From the above results, it can be seen that the product of the present invention has a superior pitch adhesion prevention effect compared to the control agent, reduces the number of paper breaks and the number of washes, and has no effect on paper quality.

Claims (1)

[Scope of Claims] (1) A pitch anti-adhesion agent for papermaking, comprising a polymer containing the following (4) and CB) as structural units and having a number average molecular weight of 5,000 to 100,000. (4) General formula % (Here, R is a hydrogen atom or a methyl group, m is an integer of 2 to 4, n is 2 to 20, and the oxyalkylene group is one type or a mixture of two or more types.) 40 to 100% by weight of one or more types of polyoxyalkylene glycol monoacrylate or polyoxyakylene glycol monomethacrylate units represented by: (B): 0 to 60% by weight of one or more other ethylenically unsaturated monomer units copolymerizable with the structural unit of (A). (2) CI) In the formula, the alkylene oxide represented by Cn, ll2n, 0 is one or more selected from ethyne oxide, propylene oxide, butylene oxide, and tetrahydrofuran. Pitch adhesion prevention agent. (3) The structural unit of (g) is polyoxyethylene glycol mono(meth)acrylate (polyoxypropylene glycol mono(meth)acrylate, polyoxybutylene glycol mono(meth)acrylate, polyoxytetramethylene glycol Mono(meth)acrylate, poly3oxyethyleneoxypropylene glycol mono(meth)acrylate, polyoxyethyleneoxybutere/glycol mono(meth)acrylate, polyoxyethyleneoxytetramethylene glycol mono(meth)acrylate, polyoxypropyleneoxy Pethylene glycol mono(meth)acrylate, polyoxypropyleneoxytetramethylene glycol mono(meth)
Acrylate, polyoxybutyleneoxytetramethylene glycol mono(meth)acrylate, polyoxyethyleneoxypropyleneoxybutylene glycol mono(meth)acrylate, polyoxyethyleneoxypropyleneoxytetramethylene glycol mono(meth)acrylate, polyoxyethyleneoxybutyleneoxy tetramethylene glycol mono(meth)acrylate,
Claim 1 which is one or more selected from polyoxypropylene oxybutylene oxytetramethylene glycol mono(meth)acrylate, polyoxyethylene oxypropylene oxybutylene oxytetramethylene glycol mono(meth)acrylate Pitch adhesion prevention agent for paper manufacturing. (4) Other ethylenically unsaturated monomer units that are the constituent units of (B) are ethylene, isobutylene, butadiene, diisobutylene, styrene, α-methylstyrene, p
-Methyl-α-methylstyrene, acrylonitrile, vinyl acetate, glycidyl (meth)acrylate, methyl (
meth)acrylate, ethyl(meth)acrylate, butyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, lauryl(meth)acrylate, 2-
The claimed compound is one or more selected from hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, nclohexyl (meth)acrylate, acrylamide, N-methylolacrylamide, (meth)acrylic acid and salts thereof. The papermaking pitch anti-adhesion agent according to any one of items 1 to 3.