JPH03227493A - Dispersant or papermaking synthetic fiber and its usage - Google Patents

Abstract

PURPOSE:To provide the title dispersant capable of enhancing the dispersibility of the synthetic fiber in the papermaking process for synthetic fiber-contg. paper stock, low in foamability, and capable of giving uniform paper in high productivity, comprising a specific compound and an alkali metal salt of a specific aliphatic hydrocarbon. CONSTITUTION:The objective dispersant comprising (A) a compound of the formula (R is 6-18C alkyl; A is 2-4C alkylene; m is 0-2; n is 3-25) (e.g. ethylene oxide adduct of octylphenol) and (B) a compound of formula R'COOX (R' is 7-21C aliphatic hydrocarbon; X is alkali metal) (e.g. sodium laurate) at the weight ratio A/B=(45:55)-(95:5) [pref. (60:40)-(80:20)]. It is preferable that the amount of the present dispersant to be used be such as to be 0.1-1wt.% based on the papermaking synthetic fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synthetic fiber dispersant for papermaking and a method for using it. More specifically, a synthetic fiber dispersant for paper making that has good dispersibility of synthetic fibers in paper stock and has low foaming properties in the paper making process of a fibrous material for paper making (paper stock) containing synthetic fibers, and a method for using it. Regarding.

[Prior Art] Natural cellulose (pulp), which is a fibrous material for papermaking (paper stock), is being partially replaced by synthetic fibers in recent years due to rising raw material costs and higher performance requirements for paper.

Conventionally, as a dispersant for this synthetic fiber for paper making, 1, for example,
- Copolymer derivatives of ethylene oxide and propylene oxide have been proposed as dispersants for polypropylene fibers (for example, Japanese Patent Publication No. 47-40082), and copolymer derivatives of ethylene oxide and propylene oxide have been proposed as dispersants for polyester fibers (for example, Japanese Patent Publication No. 1982-40082).
49394).

[Problems to be Solved by the Invention] However, the above-mentioned dispersant does not simultaneously satisfy the dispersibility and low foaming properties of synthetic fibers. In other words, conventional dispersants have very poor dispersibility of synthetic fibers in paper stock, making it impossible to take advantage of the excellent properties of synthetic fibers, and it is necessary to lower the fiber concentration during paper making to improve dispersibility. It had the disadvantage of poor productivity. Furthermore,
Conventional dispersants also have the disadvantage of being prone to foaming and having poor workability.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present inventors have developed a paper stock that has good dispersibility and low foaming properties in the paper making process for paper stocks containing synthetic fibers. As a result of intensive studies to obtain a dispersant, the present invention was achieved.

That is, the present invention is based on the general formula % (1) (wherein, R is an alkyl group having 6 to 18 carbon atoms; A is an alkylene group having 2 to 4 carbon atoms; m is an integer of 0 to 2; n is 3 ~
25 integer) and one or more compounds (A) represented by the general formula % formula % (2) (wherein R° is an aliphatic hydrocarbon group having 7 to 21 carbon atoms;
contains one or more compounds (B) represented by (alkali metal), and the weight ratio of (A) and (B) is 40:5.
Synthetic fiber dispersant for papermaking characterized by a ratio of 0 to 90:5; general formula % formula % (1) (wherein, R is an alkyl group having from B to 18 carbon atoms; A is an alkyl group having from 2 to 4 carbon atoms; Alkylene group; m is an integer of 0 to 2; n is 3 to
contains one or more compounds (A) represented by (an integer of 25) and one or more higher fatty acid sorbitan esters (C), and the weight ratio of (A) and (C) is 50.
:50 to 90:10; and, in the papermaking process of a fibrous material for papermaking containing synthetic fibers, each of the above dispersants is added to the weight of the synthetic fibers, This is a method of using a synthetic fiber dispersant for paper making in which paper is made by adding 0.01-10% oil.

In the present invention, the alkyl group having 6 to 18 carbon atoms representing R includes, for example, a linear or branched saturated or unsaturated alkyl group (octyl, nonyl, decyl, dodecyl, oleyl group, etc.). Among these, preferred are saturated alkyl groups having 8 to 12 carbon atoms.

Those having less than 6 carbon atoms have poor foaming properties. Also,
Those having a carbon number greater than 18 have poor dispersibility.

m is an integer of 0 to 2, preferably I or 2.

When m exceeds 2, dispersibility deteriorates.

In the present invention, the alkylene group having 2 to 4 carbon atoms representing A includes ethylene group > 1-propylene group, 1.4-
Examples include butylene groups. Among these, preferred is ethylene group.

n is an integer of 3 to 25, preferably 7 to 20.

If n is less than 3, the dispersibility is poor; if n is more than 25, the foaming property is poor.

Specific examples of compound (A) include octylphenol (
EO) 8, nonylphenol (EO) + e1 dioctylphenol (EO) + s, dinonylphenol (EO)
29 etc. In the above, (E O) p
(p is an integer) indicates pmol adduct of ethylene oxide. The same description will be used below.

In the present invention, examples of the aliphatic hydrocarbon group having 7 to 21 carbon atoms and representing Rl include straight-chain or branched saturated or unsaturated aliphatic hydrocarbon groups.

Among these, preferred are straight-chain aliphatic hydrocarbon groups having 13 to 17 carbon atoms. Those having less than 7 carbon atoms have poor foaming properties, and those having more than 21 carbon atoms have poor dispersibility.

In the present invention, the alkali metal representing X is Na
Examples include 5K.

Specific examples of compound CB) include sodium laurate or salt, sodium palmitate or salt, and sodium stearate.
Examples include a or ni salt, oleate Na or ni salt, and the like.

Specific examples of the higher fatty acid sorbitan ester (C) include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan dilaurate, sorbitan dipalmitate, and the like.

Preferred among these are sorbitan monoesters such as sorbitan monolaurate, sorbitan monopalmitate, and sorbitan monostearate.

In the present invention, the weight ratio of (A) and (B) is usually 45
:55-95:5, preferably 80:40-80:20
It is.

If the ratio of (A) exceeds 95, low foaming properties will be poor.

Moreover, when it is less than 45°, the dispersibility of the synthetic fiber becomes poor.

In the present invention, the weight ratio of (A) and (C) is usually 50
:50-90:10, preferably BO:40-70:
It is 30.

If the ratio of (A) exceeds 30, low foaming properties will be poor.

Moreover, when it is less than 50, the dispersibility of the synthetic fiber becomes poor.

The dispersant of the present invention may contain other surfactants as necessary, as long as they do not impair performance. Other surfactants include higher alcohol alkylene oxide (EOl propylene oxide, etc.) adducts, long chain alkyl sulfonates, long chain alkyl sulfates, higher fatty acid soaps, and the like.

When other surfactants are included, their content is usually 10% or less, preferably 5% or less, based on the weight of the dispersant.

The dispersant of the present invention can be used as a dispersant for synthetic fibers in paper stock. Examples of synthetic fibers include polypropylene, polyester, acrylic, polyamide, vinylon, rayon, etc., and tyrorough type fibers can be mentioned.

There is no particular limitation on the content of synthetic fibers in the paper stock in which the dispersant of the present invention can be used, and the pulp may contain synthetic fibers in any proportion or may be made entirely of synthetic fibers.

The amount of the dispersant of the present invention attached to the synthetic fiber is usually 0.01 to 10%, preferably 0.01 to 10%, based on the weight of the synthetic fiber.
It is 1-1%.

The dispersant of the present invention is usually used by lubricating synthetic fibers and then mixing them with pulp, but it may also be lubricated into a paper charge consisting of synthetic fibers and pulp or synthetic fibers alone. The former method is preferred. As a lubricating method, for example, this dispersant may be emulsified with water to form an emulsion, and the synthetic fibers may be lubricated by a known method such as a spray lubricating method or an immersion lubricating method. A paper stock made of lubricated synthetic fibers or a mixture of synthetic fibers and pulp is disintegrated in water, and then paper is made in a paper machine.

[Example] The present invention will be explained below with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Below, % represents weight %.

Examples 1 to 6 and Comparative Examples 1 to 4 The formulations of the dispersants used in the Examples and Comparative Examples are as follows.

Example 1 (Dispersant of the present invention) Dinonylphenol (EO) + s 65% Na stearate 20% Na oleate Example 2 (Dispersant of the present invention) Nonylphenol (EO) s Na Balmitate Example 3 (Dispersant of the present invention) (dispersant of the present invention) dinonylphenol (EO) + * nonylphenol (EO) * lauric acid, stearic acid, stearyl alcohol (EO) s Example 4 (dispersant of the present invention) dinonylphenol (EO) + s Sorbitan monostearate example 5 (Dispersant of the present invention) Nonylphenol (EO) +s Sorbitan monopalmitate Example 6 (Dispersant of the present invention) Dinonylphenol (EO) +s Nonylphenol (EO)* Sorbitan monostearate 15% 70% 30% 35 % 25% 20% 15) g 5% 70% 30% 60% 40% 45% 25% 25% Stearyl alcohol (EO) 1 5% Comparative example 1 Nonylphenol (EO) +s 100% Comparative example 2 Nonylphenol (EO) s 20% Na stearate 60% stearyl alcohol (EO) +s 20% Comparative Example 3 Nonylphenol (EO)? -(PO)+*100% Comparative Example 4 Stearyl alcohol (EO)+s 100% (dispersibility test) 0.4 solid% of each of the above dispersants was attached to a solvent-extracted synthetic fiber telop (1.5 d 15 mm). 100
Take 500cc of ion-exchanged water in a 0cc beaker, stir with a magnetic stirrer, and add the above chopped 0cc water to the beaker.
．． 1 g was added and stirred for 2 minutes. Immediately after the stirring was completed, the mixture was passed through a vacuum port L1 using a suction bottle covered with a black cloth.The state of dispersion of the chips on the black cloth was visually observed. The results are shown in Table 1 Table 1 (Dispersibility test) Note) PP: Polypropylene fiber PE: Polyester fiber to the heater,
5000 cc of 0.1 sold% emulsion of each of the above dispersants was allowed to fall naturally through a shower nozzle (diameter 2 o, 19 holes) installed at a height of 300 H, and the state of the foam immediately after falling was observed with the naked eye.

The results are shown in Table 2.

Table 2 (Foaming test) Note: O: Almost no foam △ Slightly more foam × More foam From the results in Tables 1 and 2, all the dispersants of the present invention have excellent dispersibility and low foaming properties. .

(Usage example) Polypropylene fiber tip (1,5d15mIm) Polyester fiber tip i1-/pu (1-5d, 5mm)
Examples 1 to 6 and Comparative Example 1 were applied by spray lubrication method.
After adding 0.4% by weight of each dispersant in Examples 1 to 4, it was disintegrated in water and paper was made using a circular mesh paper machine. As a result, each of the dispersants in Examples 1 to 6 was used for both polypropylene fiber and polyester fiber. In this case, paper with good texture and extremely uniform thickness was produced, but when each of the dispersants of Comparative Examples 1 to 4 was used, there were many lumpy aggregates of fibers, and paper with many uneven thicknesses was produced. .

[Effects of the Invention] The dispersant of the present invention has the following effects in the papermaking process of paper stocks containing synthetic fibers.

11 Since the dispersion state of the paper stock is improved, the formation of the paper is good (paper with uniform thickness can be produced).

2. Even in the disintegration process where the content of synthetic fibers in the paper stock is high and/or the paper stock concentration is high, density unevenness does not occur due to good dispersibility. Especially in the CHEST tank, paper density unevenness is significantly reduced. .

3. Paper stock accumulates in clumps in slurry stagnation areas during the paper-making process, or slurry adheres like water scale to the walls of tanks and valves, and it somehow gets mixed into the slurry. This reduces problems such as sudden paper quality disturbances.

4. Cost reduction can be achieved by increasing the paper stock concentration and increasing the paper making speed.

Since the above effects are achieved, the dispersant of the present invention is useful as a dispersant for synthetic fibers for paper making.

hand Continued Supplementary Positive book December lcj, 1990 1.Display of the incident 1990 Patent Application No. 258106 2. Name of the invention Synthetic fiber dispersant for papermaking and usage 3. Person who makes corrections Relationship to the case Patent applicant 4. Date of amendment order Voluntary 5. Number of inventions increased by amendment Specification page 4 1 one line r40:50-90:5J The description is r45:55-95:5J Correct.

Claims (1)

[Claims] 1. General formula ▲ Numerical formula, chemical formula, table, etc. ▼ (1) (In the formula, R is an alkyl group having 6 to 18 carbon atoms; A is an alkylene group having 2 to 4 carbon atoms; m is an integer from 0 to 2; n is from 3 to 2
one or more compounds (A) represented by (an integer of 5) and the general formula R'COOX (2) (wherein R' is an aliphatic hydrocarbon group having 7 to 21 carbon atoms; X is an alkali metal); Contains one or more of the represented compounds (B), and the weight ratio of (A) and (B) is from 45:55 to
A synthetic fiber dispersant for paper making characterized by a ratio of 95:5. 2. Contains one or more compounds (A) according to claim 1 and one or more higher fatty acid sorbitan esters (C), and the weight ratio of (A) and (C) is 50:50.
A synthetic fiber dispersant for papermaking, characterized in that the ratio is 90:10. 3. Synthesis for paper making in which 0.01 to 10% of the dispersant according to claim 1 or 2 is oiled based on the weight of the synthetic fibers in the paper making process of a fibrous material for paper making containing synthetic fibers. How to use fiber dispersants.