JPS6099098A - Papermaking size 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 sizing agent which is used for paper sizing and is mainly composed of a mixture of substituted succinic anhydride and phosphoric acid ester of polyethylene glycol monoether.

general formula (In the formula, R1 represents an alkyl group or an alkenyl group.

) is called ASA for simplicity, and (in the formula R2, R, ,
R4 represents an alkyl group or an integer from alkylphenyl a, 2, 8, a halo to 20, respectively.
I'll call it GgP.

Previously, rosin-based sizing agents were mainly used to give paper water resistance, but in that case aluminum sulfate was used as a fixing agent, and the stock solution became acidic during the papermaking process, damaging equipment. Another drawback was that the paper left behind was acidic and deteriorated significantly. In order to avoid this drawback, in recent years attention has been paid to papermaking in neutral or slightly alkaline conditions, and sizing agents using alkyl ketene dimers have been used, but these have a slow reaction with paper fibers. The development of sizing properties gradually occurred over a long period of 24 hours or more, and as a result, the sizing properties before the size press were low and not constant, causing problems such as the amount of liquid absorbed by the size press was not constant. . As a countermeasure to this problem, an ASA-based sizing agent was developed that reacts quickly with paper fibers, exhibits sizing properties in the wet compression rolls of paper machines, and stabilizes the amount of liquid absorbed. That is, it has been discovered that an ASA-based sizing agent becomes a good sizing agent when emulsified under high pressure with a cationic starch, such as the hydrochloride of β-diethylaminoethylated starch. However, this method has the disadvantage of being easily hydrolyzed and requires the use of an expensive pressurized emulsifying machine, so it cannot be said to be advantageous. On the other hand, in Japanese Patent Publication No. 39-2305, when AsA is mixed with cationic starch, such as primary to quaternary aminated derivatives of starch, sulfonium and phosphonium derivatives,
No. 36044 contains water mixed with ASA and one or more compounds selected from polyoxyethylene adducts of mono- and di-saturated fatty acid ester alkylphenols of poly(oxyethylene) glycol, and polyoxyethylene adducts of saturated alcohols. It is stated that the dispersion gives good sizing results.

However, since the sizing agents of these compositions do not yet have sufficient stability over time, there are concerns about storage after mixing, and there is a drawback that the sizing agents have to be adjusted immediately before use.

Therefore, the present inventors conducted various researches on ASA emulsifiers that have better dispersion stability and are more durable during storage, and have finally completed the present invention.

That is, the purpose of the present invention is to provide a sizing agent that can withstand long-term storage, and more specifically, it is an object of the present invention to provide a sizing agent that is emulsified with an emulsifier that has superior dispersion stability over time compared to conventional emulsifiers. It is to provide.

The emulsifier used in the present invention is different from conventional emulsifiers,
It is characterized by being a phosphoric acid ester, and has the general formula (
n), 1 mol of R20(CH,Cf(20)n2
Ester to be produced by esterification reaction of H and 0.5 mol of P2O; general formula (to).

Indicates 1 mole of ■ζ! 1) (CH,CH20)It,
f (and 1 mole of Rs + 0 (Cf (2CHgO) naf■
and 0.5 mol of P2O6; 1 mol of R20(Ci(2CH2t))n2H, respectively, as shown in the general formula (to).

R80(CH2CH2t))nBt(, R40(C1f
2CM20)n4f (one or more compounds selected from esters formed by the ester reaction with (1.5% of P2O5; abbreviated as PEGEP)).

``The word ``1'' was used to focus on the molar ratio relationship between poly(oxyethyl) alcohol and phosphorus pentoxide, and refers to the ester that has undergone changes such as dehydration condensation during use. This is to include it.

For the production of PEGEP, for example, a method in which lauryl (polyoxyethylene) alcohol (a compound in which ethylene oxide is attached to 1 mole of lauryl alcohol) is reacted with phosphorus pentoxide is appropriately used.

As the composition of the sizing agent of the present invention, AS
The reason why A80-99 parts by weight and 1 GEP20- were limited to parts by weight is that if PEGEP is less than 1 part by weight, even if a homomixer is used, emulsification to a particle size of about 1 μ is not possible.
This is also because if the amount exceeds 20Ji parts, the sizing properties will deteriorate.

In addition, "4", "a", B4 of emulsifier (PEGBP)
If the value is less than 6, set ASA 90, PEGEPI
Even if the QjJit part is emulsified with a homomixer, it will not be possible to emulsify particles with a particle size of 1μ or less, and particles with a diameter of 20 or more will become solid.
This is because it will not be satisfied with SA, and n2nB, B4
The preferred value of is 8-16. Also R2, R8, R
4 preferably has 8 to 18 carbon atoms; if it is less than 7, the emulsifying property is poor, and if it is 19 or more, the solubility in ASA is poor.

*Leprosy Example B) Production of PEGEP 500i of lauryl (10 oxyethylene) alcohol (a compound in which an average of 10 moles of ethylene oxide is added to 1 mole of lauryl alcohol) was heated to 30°C, and while stirring, 38.8 parts by weight of lauryl (10 oxyethylene) alcohol was added. Add phosphorus pentoxide in small portions while cooling. After the addition was completed, it was left to stand at 30°C for 2 hours, and an ester of 1 mole of lauryl (polyoxyethylene) alcohol and 1 mole of phosphoric acid (compound ■ type), 2 moles of lauryl (polyoxyethylene) alcohol and 1 mole of phosphoric acid were prepared. An almost isochemical compound (referred to as PEGEP in this example) with an ester (compound type 3) was obtained.

←) Production of sizing agent 904i parts of octadecenyl succinic anhydride and the above PE
Mix with 10 parts by weight of GEP; (a) Immediately add 990 parts by weight of water;
Mix by mixing with a household mixer for 1 minute,
A liquid A1 having a solid content of 1% by weight was obtained. (b) Liquid B1 was obtained by performing substantially the same operation as in (a) except that the mixture was kept in a constant temperature bath at 30° C. for 7 days after mixing. Furthermore, (c)/l! Liquid C1 was obtained by performing substantially the same operation as in (&) except that the mixture was kept in a constant temperature bath at 30° C. for 30 days.

Also, for comparison, nonylphenol poly(oxyethylene) adduct (NOPPEO) was used instead of PEGEP.
(10 ethylene oxides per mole of nonylphenol), poly(oxyethylene) laurate (PEO
10+Jtjt parts of L) (Halfester having a numerical value of 6 of ethylene oxide per mole of lauric acid) are mixed with 90 parts by weight of the above ASA to substantially form PE.
Using the same operation as for GEP, (a) Immediately after mixing, Mon) 30
After mixing, A2, B2, C2, A3 for 7 days at °C and (c) 30 days at 30 °C, respectively.
, B3, and C3 were obtained.

Table 1 shows the dispersibility and particle size of these liquids.

Table 2 also shows the test results for size.

However, the test method is as follows.

420 c, s, f, pulp (1, BKP/NBKP
= 7/3) Calcium carbonate powder was added as a filler to 2 tons of titanium slurry at 20% by weight based on the pulp solid content, and 5 parts by weight of diethylamine ethyl starch and 95 parts by weight of water were heated. After adding 10% by weight of the cationic starch prepared by the pulp based on the solid content of the pulp, 0.2% by weight of the sample ASA-based mixed sizing liquid was added based on the ratio of non-volatile content to pulp solidification, and TAPP I (The Technic
alAssociation of the Pu1p
The wet paper obtained by papermaking in a conventional manner using a sheet machine according to the standard method manufactured by J.D.
The Steckigt size degree (JIS:
P8122) was measured.

Procedural amendment January 1980/P date 1982 Director-General of the Patent Office Kazuo Wakasugi Indication of the case Title of the invention of patent application No. 1982-205423
Relationship with the Case of Person Who Corrects Paper Sizing Agents Patent Applicant (EiA, 77. 671 Mizuashi, Noro-cho, Kakogawa-shi, Hyogo Prefecture)
4 names (2 scoops 0 Representative of Harima Kasei Kogyo Co., Ltd.) 1925 (Showa 41) Date voluntary amendment
□o Contents "Image formation" on page 10, line 5 of the specification has been corrected to "solid content."

Claims (1)

[Scope of Claims] 80 to 99 parts by weight of a compound represented by the general formula (in which R1 represents an alkyl group or an alkenyl group) and the general formula (in which "*, R@, Ra are each an alkyl The main active ingredient is a mixture of 20 to 1 part by weight of 1 or more compounds selected from the group or alkylphenyl group, "2" and "8s" 4 each represent an a of 6 to 20. A sizing agent for paper making.