JPH0693567A - Polyester fiber for producing paper - Google Patents

Abstract

PURPOSE:To provide the polyester fiber excellent in its dispersibility on the production of paper, capable of readily giving the polyester fiber paper good in strength and weave, excellent in baling workability in a baling process because of not generating the slipping-down of the fibers, and used for producing the paper. CONSTITUTION:A treating agent containing a polyester polyether block copolymer comprising terephthalic acid and/or isophthalic acid, a lower alkylene glycol, and a polyalkylene glycol and/or its monoether and a polypeptide in an amount of 5-100wt.% based on the block copolymer is made to adhere to a polyester fiber.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can provide a polyester fiber paper having excellent fiber dispersibility in a papermaking process, which is strong and has a good texture, and can be used in a packing process without slipping of fibers in the packing process. It relates to a polyester fiber for papermaking having good properties.

[0002]

2. Description of the Related Art Conventionally, a method has been proposed in which various treating agents are attached to polyester fibers for papermaking in order to improve dispersibility during papermaking. For example, JP-A-58-20850
No. 0 discloses a polyester fiber having a specific polyester polyether block copolymer attached to the surface thereof, and JP-A-60-224899 discloses a polyester polyether obtained by copolymerizing a compound having a metal sulfonate group. A polyester fiber having a block copolymer attached thereto has been proposed.

[0003]

However, since the former polyester fiber for papermaking has good dispersibility but high smoothness, the short fiber in the packing process, particularly in the compression box, is not used. When filling, compressing and then opening the door of the compression box, some of the fibers slip and fall,
It has the drawback of being difficult to package. On the other hand, the latter polyester fiber for papermaking has an excellent packing property, but has a problem that the initial dispersibility is somewhat insufficient and cannot be used for papermaking mixed with pulp, rayon and the like.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and its purpose is to have excellent initial dispersibility at the time of paper making and to be easily dispersible in a dispersing step,
Polyester fiber for papermaking that can produce polyester fiber paper with good strength and texture, or polyester fiber mixed paper with pulp, rayon, etc., and does not slip off in the packaging process and has good workability in packaging. To provide.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that by adding a treating agent containing a specific polyester polyether block copolymer and a polypeptide, It was found that the friction between fibers can be remarkably increased without increasing the friction between fibers, and the initial dispersibility is good.
The present invention has been reached.

That is, according to the present invention, a polyester polyether block copolymer containing terephthalic acid and / or isophthalic acid as a main acid component and lower alkylene glycol and polyalkylene glycol and / or its monoether as a main alcohol component. And a treating agent containing 5 to 100% by weight of a polypeptide based on the weight of the polyester polyether block copolymer are adhered to the polyester fiber to provide a polyester fiber for papermaking. .

The polyester polyether block copolymer used in the present invention is a block containing terephthalic acid and / or isophthalic acid as a main acid component and lower alkylene glycol and polyalkylene glycol and / or its monoether as a main alcohol component. It is a copolymer. The term "mainly" used herein means that an acid component or an alcohol component other than the above may be copolymerized within a range not impairing the object of the present invention,
Usually, the amount of all copolymerization components is 20 mol% or less, preferably 10 mol% or less, based on the total acid components.

Polyester polyether block copolymers preferably used include, for example, terephthalic acid
Copolymerization of alkylene glycol-polyalkylene glycol, terephthalic acid-isophthalic acid-alkylene glycol-polyalkylene glycol, terephthalic acid-alkylene glycol-polyalkylene glycol monoether, terephthalic acid-isophthalic acid-alkylene glycol-polyalkylene glycol monoether An example is coalescence. As the lower alkylene glycol used for producing the copolymer, ethylene glycol, propylene glycol, tetramethylene glycol and pentamethyl glycol are suitable, and as the polyalkylene glycol, the average molecular weight is usually 400 to 12,000, preferably Polyethylene glycol of 600 to 6,000, polyethylene glycol / polypropylene glycol copolymer, and polypropylene glycol are preferable. Further, as the polyalkylene glycol monoether, monomethyl ether such as polyethylene glycol, monoethyl ether, monophenyl ether and the like are preferable, but polyethylene glycol monoethers are particularly preferable from the viewpoint of the effect of improving dispersibility.

The block copolymer has a terephthalate unit: isophthalate unit of 95: 5 to 50:50.
It is particularly preferable that it is within the range of (molar ratio) from the viewpoint of the effect of improving dispersibility, and the ratio of terephthalate unit + isophthalate unit: polyalkylene glycol unit is 3: 1 to 1.
It is particularly preferable that it is within the range of 10: 1 (molar ratio) from the viewpoint of the effect of improving dispersibility.

The average molecular weight of the block copolymer depends on the molecular weight of the polyalkylene glycol used, but is usually 1,000 to 20,000, preferably 3,0.
It is from 00 to 10,000. If the average molecular weight is less than 1,000, the effect of improving dispersibility tends to decrease, and
If it exceeds 10,000, the dispersion of the copolymer tends to deteriorate.

Next, the polypeptide used in the present invention is
It is obtained by hydrolyzing a protein obtained from a biological substance such as cow leather, and has an average molecular weight of 20.
The range of 0 to 10,000 is preferable, and when it is less than 200, the effect of increasing the friction coefficient between fibers tends to be insufficient and the packing property tends to be poor, while when it exceeds 10,000, water may be used. The solubility tends to decrease, the liquid stability of the treating agent decreases, and the initial dispersibility of the obtained fiber tends to decrease. Particularly preferably, the average molecular weight is 300 to 3,000.
Those in the range of 0 are desirable.

The content of this polypeptide is 5 to 100% by weight, preferably 20 to 40% by weight, based on the content of the polyester polyether block copolymer.
And need to. When it is less than 5% by weight, the effect of increasing the coefficient of friction between fibers is insufficient and the packing workability is deteriorated, while when it is more than 100% by weight, the dispersibility in water is deteriorated and the cutter process is also performed. In this case, the single yarn is often wound around the roller due to adhesion, which is not preferable.

The polypeptide used in the present invention is acylated with a higher fatty acid such as octanoic acid, lauric acid, myristic acid, stearic acid, etc.
It is preferable because the surface activity is increased and the stability of the treatment liquid is improved.

Any method can be adopted to attach the treatment agent containing the above-mentioned polyester copolymer block and the polypeptide to the polyester fiber, but the treatment method as an aqueous solution or dispersion is preferable. It is convenient. Here, to the aqueous solution or dispersion, an anionic surfactant or a nonionic surfactant may be added in order to improve the stability, and within a range not hindering the other objects of the present invention, charging may be performed. You may mix | blend various additives, such as an antioxidant, an antioxidant, a ultraviolet absorber, a whitening agent, and a pigment.

The above treatment may be carried out at any step before the paper making step, but it is effective to stretch the polyester fiber, treat it with an aqueous dispersion (aqueous liquid), heat-treat it, and then cut it. . The amount of the treatment agent attached to the polyester fiber is 0.05 to 1.00% by weight, preferably 0.20 to 0.35% by weight. If the adhesion amount is less than 0.05% by weight, the dispersibility effect during papermaking tends to be small, while if it exceeds 1.00% by weight, the packing property improving effect tends to decrease. In addition,
As the attachment method, a normal method such as dipping or spraying is adopted.

The polyester fiber for papermaking of the present invention is a fiber made of polyethylene terephthalate, polybutylene terephthalate, etc., which are modified, for example, basic dye dyeable polyester, flame retardant polyester, antistatic property. It goes without saying that fibers made of polyester or the like are also included. Further, the denier and the fiber length are the same as those of ordinary papermaking polyesters, and if the denier is too small or the fiber length is too long, the dispersibility is decreased, while if the denier is too large or the fiber length is short, the paper obtained is obtained. The denier is 0.1 to 3.0 denier and the fiber length is 3 to 25 mm because the strength of
It is preferably about the same.

The polyester fiber for papermaking according to the present invention as described above has a water dispersibility of 4.
It is particularly preferable that the grade is 0 or more and the undispersed number is 50 or less in order to obtain a polyester fiber-based or polyester fiber-mixed paper with good formation, and a packing factor of 40 or more improves packing workability. Is particularly preferable in the above.

[0018]

As described above, the polyester fiber for papermaking according to the present invention is provided with the treating agent containing the specific amount of the polypeptide in the specific polyester polyether block copolymer as described above. It is possible to increase the friction between fibers without deteriorating the properties of the block copolymer such as uniform adhesion to polyester fibers, adhesion, or water dispersibility of the obtained fibers.

Therefore, the slipping of fibers in the fiber packing process is eliminated, and the packing workability is improved. On the other hand, the water dispersibility of fibers in the paper making process is improved by the conventionally proposed papermaking process with improved dispersibility. As good as polyester fiber,
It is possible to obtain a polyester fiber paper that is strong and excellent in formation. Further, since the dispersibility in water is good, it is possible to make a paper by itself, and it is possible to make a paper having a longer fiber length. Further, it may be mixed with other fibers such as wood pulp, rayon, vinylon fiber, nylon fiber, polypropylene fiber, glass fiber, etc. to make paper.

Although the sticky agent added during papermaking has the ability to improve the dispersibility to some extent, the polyester fiber of the present invention has a very good dispersibility, and therefore the aid of the sticky agent is almost unnecessary. As a result, the sticky agent can be used only for adjusting drainage, which is advantageous in process control.

[0021]

EXAMPLES The present invention will be described below with reference to examples, but the evaluation items in the examples were based on the following methods.

Water Dispersibility Evaluation 500 ml of water is put into a 1000 ml graduated cylinder, and 0.1 g of polyester fiber is put therein. When the polyester fiber reaches the bottom of the graduated cylinder, cover the graduated cylinder, hold the top and bottom with both hands, invert the graduated cylinder once to disperse the fibers, and count the number of binding fibers contained in this. To obtain the undispersed number. At the same time, the quality of the dispersed state of each short fiber in water is judged according to the criteria shown in Table 1.

[0023]

[Table 1]

Packing factor A cylindrical container 1 with a diameter of 100 mm and a height of 140 mm shown in FIG.
188 g of the fiber sample 2 was put therein and compressed so that the height of the fiber sample was 129 mm, and the fiber density was adjusted to about 0.2 g / cm ³ , and then a cylindrical part having a diameter of 50 mm and a height of 100 mm was formed. It consists of a cone with a height of 25 mm. With a weight of 2 kg made of stainless steel, with the tip of the cone facing downward,
The sinking amount x of the weight 3 after placing it on the fiber sample 2 in the cylindrical container 1 for 5 minutes was measured, and the distance h from the bottom of the cylindrical container 1 to the tip of the cone of the weight 3 was calculated as h = (120 -X)
Calculate mm and use this value as the packing factor.

[0025]

Example 1 An undrawn yarn having a denier of 4 denier was obtained from a polyethylene terephthalate chip having an intrinsic viscosity of 0.64 dl / g by a conventional method. The undrawn yarns are aligned to form an undrawn tow of 500,000 denier, and the draw ratio is 3.2.
The tow was stretched at a stretching rate of 80 m / min, and the tow was treated in the treatment agent shown in Table 2 (4.0 wt% emulsion) to
After heat treatment at 20 ° C., it was cut into 5 mm. The obtained polyester fiber had a single yarn denier of 1.5 denier, and the coating amount of each treating agent was 0.30% by weight. The results of evaluating the dispersibility of this fiber are shown in Table 2.

The packing factor of the obtained polyester fiber is 5
No. 5, and when packed with an ordinary Bering box type fiber packing machine, there was no slipping of the fibers when the compression box (bering box) was filled and compressed with polyester fiber and then the door of the compression box was opened. The work was done smoothly and there was no problem.

[0027]

Examples 2 to 9 and Comparative Examples 1 and 2 The procedure of Example 1 was repeated, except that the average molecular weight and the blending amount of the polypeptide were changed as shown in Table 2. The results are also shown in Table 2.

[0028]

[Table 2]

In the table, A is an ethylene terephthalate unit:
80:20 ethylene isophthalate units, (ethylene terephthalate units + ethylene isophthalate units):
It is a polyester polyether block copolymer having a polyethylene glycol unit of 7: 1 (molar ratio) and a polyethylene glycol unit having an average molecular weight of 3,000 and an average molecular weight of 8,000. In addition, the packing workability and the overall evaluation are represented by ⊚: excellent, ◯: good, Δ: acceptable, and +: not acceptable.

As is apparent from the above table, if the blending ratio of the polypeptide to the polyester polyether copolymer is less than 5% by weight, the packing workability becomes insufficient,
On the other hand, when it exceeds 100% by weight, the dispersibility of the fiber in water decreases, whereas in the range of 5 to 100% by weight, both of these properties become good. In addition, the average molecular weight of the polypeptide and the amount of the treatment agent attached are each 200
It can be seen that the above-mentioned packing property and dispersibility are particularly good when the amount is in the range of up to 10,000 and 0.05 to 1.0% by weight.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an apparatus for measuring a packing coefficient.

[Explanation of symbols]

 1 Cylindrical container 2 Fiber sample 3 Weight

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D21H 17/53 13/24 // D06M 101: 32 D06M 15/507 15/15 7199-3B D21H 5 / 20 D

Claims (1)

[Claims] 1. A polyester polyether block copolymer containing terephthalic acid and / or isophthalic acid as a main acid component and lower alkylene glycol and / or a polyalkylene glycol and / or its monoether as a main alcohol component, and the polyester polyether. A polyester fiber for papermaking, wherein a treating agent containing 5 to 100% by weight of a polypeptide based on the weight of the block copolymer is attached to the polyester fiber.