JPS6342996A - Neutral size composition - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a neutral sizing agent composition used under neutral to weakly alkaline papermaking conditions.

[Prior art]

Rosin-based sizing agents are the most commonly known sizing agents for V25 paper, but the sized paper obtained using rosin-based sizing agents generally maintains acidity, so they have poor printability and long-term storage. It has the disadvantage that stability is not necessarily sufficient. In other words, when a rosin-based sizing agent is used, it is customary to use aluminum sulfate as a constant sizing agent and make the paper under acidic conditions, so the sized paper obtained in this way retains its acidity. This impairs the printability and long-term storage stability of the size paper.

On the other hand, neutral size paper, which is made in a neutral region (including neutral and slightly alkaline) using a so-called neutral sizing agent, does not have the same drawbacks as acid size paper, which is made under acidic conditions. However, due to manufacturing costs and size effects, it has been used only for special purposes.

However, as the long-term storage stability of size paper becomes more important these days, interest in neutral size paper is increasing.

By the way, as neutral sizing agents, self-fixing cationic sizing agents such as petroleum resin-based or acrylic-based sizing agents, and reactive sizing agents such as alkenyl succinic anhydride or alkyl ketene dimer are conventionally known. Alkenylsuccinic anhydride is inexpensive and highly reactive to pulp fibers, so sizing agents containing it as an active ingredient are expected to be a sizing agent component that can replace acidic sizing agents such as rosin-based sizing agents. ing. however,
Conventional neutral sizing agents containing alkenylsuccinic anhydride as an active ingredient have been found to have poor sizing effects, perhaps because the emulsifier used to emulsify and disperse alkenylsuccinic anhydride in water has not been carefully examined. Good ones have the disadvantage that they reduce the paper strength of sized paper, while those that do not cause a decrease in paper strength have an insufficient size effect.

〔the purpose〕

In order to solve the above-mentioned disadvantages, the present invention uses hydrocarbon-substituted succinic anhydride, of which alkenyl succinic anhydride is a typical example, as an active ingredient of a sizing agent, while achieving both size effect and paper strength. It is an object of the present invention to provide a neutral sizing agent composition for paper making that satisfies the following requirements at the same time.

〔composition〕

According to the present invention, there is provided a neutral sizing agent composition characterized by containing a hydrocarbon group-substituted succinic anhydride and a betaine ester surfactant.

The neutral size composition of the present invention is characterized by containing a betaine ester surfactant as an emulsifier component, but this composition contains a hydrocarbon group-substituted succinic anhydride, which is an active component of the sizing agent. Demonstrates extremely excellent emulsifying power. Therefore, when the neutral sizing agent composition of the present invention is emulsified in water, the hydrocarbon group-substituted succinic anhydride, which is the active ingredient of the sizing agent, can be emulsified and dispersed to an average particle size of about 1 μm. The reaction between the ingredients and the pulp fibers is promoted and can provide excellent sizing effects.

In addition, the neutral sizing agent composition of the present invention does not have a negative effect on the paper strength of sized paper, so it satisfies both the size effect and paper strength at the same time, and has extremely practical value. It's expensive.

Next, the present invention will be explained in more detail.

The hydrocarbon group-substituted succinic anhydride used in the present invention is
It can be represented by the following general formula (wherein R is a linear or branched alkyl group or alkenyl group having 8 to 30 carbon atoms). This substance has been known as an active ingredient of neutral sizing agents, but among them, the number of carbon atoms in the alkenyl group obtained by the reaction of α-olefin or internal olefin with maleic anhydride. An alkenyl succinic anhydride in which the number is 10-20 is preferred as the active ingredient of the sizing composition according to the present invention.

As described above, the betaine ester surfactant is an emulsifier component in the neutral sizing agent composition of the present invention.

Examples of the betaine ester surfactant used in the present invention include betaine esters of high aliphatic alcohols represented by the following general formulas (1) to (IV), betaine esters of polyoxyalkylene alkyl ethers, and polyoxyalkylene dialkyl Examples include betaine esters of phenyl ethers, betaine esters of polyoxyalkylene phenyl ethers having two or more benzene nuclei, and betaine esters of polyoxyalkylene polyhydric alcohol ethers.

indicates its alkylene oxide adduct, and also.

R1, R2, R3, R4, R1,, R1, Rv, Rs,
R3, a, b.

c, m, p, q, X and Y each represent the following.

R1: an alkyl group or alkenyl group having 8 to 30 carbon atoms, which may be linear or branched, preferably having 10 carbon atoms
~26 things.

R2: Alkylene group having 2 to 4 carbon atoms, R1: Alkylene group having 1 to 5 carbon atoms, R4, R,, R,; Alkyl group having 1 to 3 carbon atoms or -C2H40H, each of which may be the same or different. Good too.

R7, R6; an alkyl group having 6 to 20 carbon atoms or hydrogen, at least one of which is an alkyl group having 6 to 20 carbon atoms; R3; an alkyl group having 1 to 20 carbon atoms or hydrogen a;
b, c: Indicates the average number of moles added, a = real number of 0 to 20, b = R, and R, if either one of them is an alkyl group, a real number of 0 to 20, and both R7 and R8 are alkyl groups. In the case of a base, a real number c from 1 to 30 = a real number from 1 to 30; an integer p from 8 to 20; an integer q from 2 to 5; an integer from 0 to 3. However, p+q is an integer from 2 to 5.

X: an inorganic anion or an organic anion; y: a real number of 1 to 5; , R1□: hydrogen or alkyl group having 1 to 2 carbon atoms Y': alkylene group having 3 to 8 carbon atoms, oxygen sulfur or carbonyl group -R20- is one or two types of ethylene oxide, propylene oxide, butylene oxide, etc. The above units are preferably units introduced by addition polymerization of ethylene oxide. When two or more alkylene oxides are added, the addition method may be either random addition or block addition.

Inorganic anions of X include halides such as CQ-1Br-, and organic anions include CH3COO-,
Representative examples include O20, CH3-1OSO□C, and R5-. ) Such betaine ester type emulsifiers can be obtained by various preparation methods.
VI), R10 → R20 indicated by (■) and (■)
or H(V) (wherein Ro, R,, R,, R,, R,, a, b,
c, p, 9 and Y are as described above. ) High aliphatic alcohols, long chain alkyl phenols, di-long chain alkyl phenols, phenols with two or more benzene nuclei, polyhydric alcohols, polyoxyalkylene alkyl ethers, polyoxyalkylene phenyl ethers, polyoxyalkylene di long chain alkyl phenyl ethers , by using polyoxyalkylene phenyl ether and polyoxyalkylene polyhydric alcohol ether as starting materials having two or more benzene nuclei, esterifying them with lower haloalkyl carboxylic acids, and further reacting them with tertiary amines such as trimethylamine and triethylamine. Obtainable. In addition, if necessary, the above general formulas (1), (II), (m) can be prepared by ion exchange method etc.
The betaine ester of and (IV) can be an organic anion.

In the sizing composition of the present invention, the amount of the emulsifier component is 10%
0 parts by weight, a range of 3 to 25 parts by weight, preferably 5 to 20 parts by weight is appropriate, and if it is less than 3 parts by weight, the emulsion particles will not become fine when the sizing agent composition is emulsified in water. , a sufficient size effect cannot be obtained. Further, even if the amount of the emulsifier is increased beyond the above range of 3 to 25 parts by weight, no particular effect will be produced thereby, so the upper limit of the amount of the emulsifier is determined solely for economic reasons.

To explain the usage mode of the sizing composition according to the present invention, this sizing composition is emulsified in water so that the concentration of the hydrocarbon group-substituted succinic anhydride, which is the active ingredient, is 0.5 to 10% by weight. I am forced to do it.

For emulsification, normal stirring and mixing operations can be employed.

The emulsion thus obtained is blended into a pulp slurry, and the amount of the hydrocarbon-substituted succinic anhydride is 0.3 to 3 parts by weight, preferably 0.4 to 3 parts by weight, per 100 parts by weight of the pulp slurry. 1 part by weight. A cationic polymer, usually a cationically modified starch, is used as the fixing agent. Among them, 3-trimethylammonio-2
-Nitrogen content 0.2 with hydroxypropyl groups incorporated
Cationically modified starch with a weight percent or more is preferred. The amount of fixing agent used is usually 1.0 parts by weight or more per 100 parts by weight of pulp slurry. Since the sizing agent composition of the present invention is used under neutral to slightly alkaline papermaking conditions,
There are no restrictions on the type of filler for paper making, and fillers that decompose under acidic conditions, such as calcium carbonate, can also be used. The appropriate amount of filler used is 10 to 30 parts by weight per 100 parts by weight of the pulp slurry.

〔effect〕

The neutral size composition of the present invention is characterized by containing a betaine ester surfactant as an emulsifier component, but this composition contains a hydrocarbon group-substituted succinic anhydride, which is an active component of the sizing agent. Demonstrates extremely excellent emulsifying power.

Therefore, when the neutral sizing agent composition of the present invention is emulsified in water, the hydrocarbon-substituted succinic anhydride, which is the active ingredient of the sizing agent, can be emulsified and dispersed to an average particle size of about 1 μm.
The reaction between the active ingredient and the pulp fibers is promoted, and an excellent sizing effect can be provided.

In addition, the neutral sizing agent composition of the present invention does not have a negative effect on the paper strength of sized paper, so it satisfies both the size effect and paper strength at the same time, and has extremely practical value. It's expensive.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Alkenylsuccinic anhydride 100 obtained by reaction of an olefin oligomer having an average carbon number of 16 and maleic anhydride
parts by weight and 10 parts by weight of the emulsifier listed in Table 1 were mixed to prepare a sizing agent composition.

Next, 1 part by weight of this sizing composition was added to 99 parts by weight of water and emulsified using a homogenizer to form an emulsion, and the performance of each sizing composition was evaluated based on the sizing test method described below. The results are shown in Table 1 along with the amount of emulsifier.

Pulp sizing test method> Pulp slurry with a concentration of approximately 1.3% + 1% in a disintegrator (LBKP 100%, freeness 400 vs QC
3F), 20vt% of heavy calcium carbonate as a filler.
(For pulp) and stirred for 3 minutes, after which the slurry was diluted to a pulp concentration of 1.0 wt%. Next, 1.0 t% (based on pulp) of cationic modified starch with a nitrogen content of 0.31% was added to this pulp slurry, and after stirring for 3 minutes,
The amount of alkenylsuccinic anhydride in the sizing agent emulsion is 0.3 wt% or 0.5 νt% based on the pulp.
After stirring for 3 minutes, add water until the concentration is 0.
．． The valve slurry is 5 wt%.

This slurry was then passed through a standard sheet machine (JISP-
8209) and dried in a rotary dryer at 105° C. for 3 minutes to obtain a size paper with a weight of 60 g #rF. And the size degree of this size paper is JISP-
The paper strength is measured by the Stekicht method based on the method of JIS P-8122, and the paper strength is measured by the bursting test method based on the method of JIS P-8112.

As is clear from Table 1, in Example 1-8, in which a betaine ester surfactant was used to emulsify alkenylsuccinic anhydride, satisfactory results were obtained in terms of both size effect and paper strength. In Comparative Examples 1 and 2, in which a surfactant other than betaine ester was used, both size effect and paper strength could not be satisfied at the same time.Comparative Example 3 was an experimental example in which no emulsifier was used at all. From this comparison, it can be seen that the betaine ester surfactant of the present invention does not impair paper strength enhancement.

Claims (3)

[Claims] (1) A neutral sizing agent composition containing a hydrocarbon group-substituted succinic anhydride and a betaine ester surfactant. (2) The neutral sizing agent composition according to claim 1, wherein the hydrocarbon group-substituted succinic anhydride is an alkenylsuccinic anhydride. (3) The betaine ester surfactant is a betaine ester of a high aliphatic alcohol, a betaine ester of a polyoxyalkylene alkyl ether, a betaine ester of a polyoxyalkylene dialkylphenyl ether, a polyoxyalkylene phenyl ether having two or more benzene nuclei The neutral sizing agent composition according to claim 1, which is at least one betaine ester surfactant selected from betaine esters of and betaine esters of polyoxyalkylene polyhydric alcohol ethers.