JPS6359478A - Hydrophobic synthetic fiber product reduced in water absorbing speed and having excellent processability - 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 The present invention relates to a hydrophobic synthetic fiber product having a water absorption rate reduced by a factor of 11 and excellent processability.

An object of the present invention is to impart an appropriate water absorption rate to intermediate or final products made of hydrophobic synthetic fibers such as polyester fibers and polypropylene fibers. As is well known, polyester fibers and polypropylene fibers are hydrophobic and difficult to wet with water. However, it is known that it is therefore extremely susceptible to charging and must be coated with an antistatic agent in order to pass through various manufacturing processes. However, #a fiber to which a normal antistatic agent was applied,
It loses its conventional hydrophobic properties and becomes hydrophilic, that is, becomes easier to wet. In this way, it is a difficult proposition to satisfy both processability and hydrophobicity at the same time.

The main application of the present invention is to process cloth made of this kind of hydrophobic fiber products using various water-soluble or water-dispersed processing solutions. A typical example is rubber latex treatment for fire hoses, etc. For example, rubber latex treatment of fire hose fabric is usually carried out by continuously soaking the fabric in a latex solution.

If the cloth surface is covered with a treatment agent having high water absorption properties, the amount of latex absorbed into the cloth during a given treatment will increase, leading to an increase in processing costs. Therefore, if the cloth surface can be made hydrophobic, unnecessary latex can be omitted, which will have a direct impact on reducing processing costs. At the same time, it also has the advantage of reducing the amount of latex used, making the surface more uniform in appearance, and reducing the weight of the hose. The same applies to cases other than fire hoses. A similar reduction in processing costs can be achieved in fields that use rubber latex, such as commonly used canvas and construction materials.

Another advantage of the present invention is that it improves process passability during knitting. Conventionally, when knitting rubber-coated cloth, especially in circular shapes such as fire hoses, the rotational speed of the knitting machine was at most 30 revolutions per minute. However, when the rotational speed is further increased in order to improve productivity, troubles such as the W4 fibers being rubbed by guides, knitting needles, etc., causing them to break or being electrostatically charged occur frequently. The fiber waste generated in this way becomes so-called wind cotton and sticks to the spun yarn, causing a decrease in quality.

The surface treatment agent used in the present invention greatly improves the passability of these processes during high-speed knitting, and can impart properties to fibers that can withstand high-speed knitting at substantially 40 revolutions per minute.

Another use of the present invention is as a nonwoven fabric for face covers of diapers, sanitary products, etc. These sanitary materials have the advantage of being made of highly absorbent fibers, such as absorbent cotton or rayon cotton, covered with hydrophobic fibers. For example, if the sanitary material gets wet, the moisture will simply pass through the face covering and will not wet the surface. Therefore, the usability is very good. However, when hydrophobic fibers are used, various treatment agents are applied to their surfaces to improve processability, and these treatment agents ultimately determine the characteristics of the face cover. .

Therefore, it is desirable to have a processing agent that has excellent processing properties and also has hydrophobic properties.

More importantly, for hygiene reasons, it must be safe and harmless even if it comes in contact with the skin. As a result of diligently searching for a processing agent that satisfies all of these characteristics, the processing agent described in the present invention was arrived at.

The treatment agent used in the present invention is normal alkyl phosphate potassium containing cetyl phosphate potassium in an amount of 70Ifff11% or more and exhibits a water absorption area value of 48 or less. Here, the water absorption area value is defined as follows. In other words, 5 g of raw cotton with an inner diameter of 1 cm,
Fill a glass tube with a length of 20cm, 21±I”C162±
Under conditions of 2% It II, the tube end is placed vertically in water and the water absorption rate is measured. Make the water rock-colored with ink, etc. and set aside. The water absorption rate can be expressed in the form of equation (+).

Here, Δ is defined as a value obtained by integrating equation (1) over a period of time up to t=IO, that is, 10 minutes. However, in order for the value to be 48 or less, a needs to be 2.27 or less, and therefore a. is defined as a range of 0<λ≦2.27.

Conventionally, the A value of polyester cotton used by the inventors for fire hoses, etc. was initially over 80, but as a result of their tireless efforts, they were able to lower it to the lowest value, around 60. . However, despite the efforts of various improvement studies during the JGII period since then, a treatment agent that shows a value lower than this value and at the same time can be used sufficiently in the processing processes of spinning and high-speed knitting hats has been developed. I couldn't find it. Therefore, those actually used in the current market have an A value of about 60, and there are no known ones that are lower than that.

The inventors of the present invention have particularly focused on the treatment agents mainly containing potassium alkyl phosphates, and have discovered that certain potassium alkyl phosphates can impart excellent properties to fibers that were previously unobtainable. did.

At this time, we found that the AI value should be 48 or less, which would show a difference of at least 20% compared to conventional products. It has been recognized that such a significant difference has an extremely beneficial effect not only on the reduction in cost due to the use of latex in practice, but also on the improvement of appearance quality, including the ability to perform high-speed knitting.

As a result of various studies, it has been confirmed that this experimental method is simple and has good reproducibility, and can sufficiently correspond to the processing results during processing. Using this method, the present inventors tested polyester fibers by applying various treatment agents or changing the concentration of the treatment agents applied, and those that performed well were further evaluated by further processing tests. As a result, it was found that a value of 48 or less is more preferable (a≦2.27 in this case), and that the most preferable results can be obtained when the value is 33 or less (a≦1.56 in this case). .

The treatment agent used in the present invention is potassium cetyl phosphate having a cedyl group having 16 carbon atoms.

This compound was not previously an unknown compound, but
It has not been known in the past that it exhibits extremely excellent properties in fields that require hydrophobic properties such as those shown in the present invention. What is very interesting is that the hydrophobic properties exhibit a minimum value depending on the number of carbon atoms bonded to the potassium phosphate.

Generally, an increase in the number of alkyl groups leads to a presumed shift to hydrophobic properties, and the existence of such a minimum value was unexpected.

Furthermore, according to general knowledge, it is believed that the electrical resistance decreases as the number of carbon atoms increases, and in fact, in order to impart electrical resistance to polyester fibers, for example, the number of carbon atoms must be increased to 1.
It was considered that 12 types, ie, potassium lauryl phosphate, should be used instead of 6 types. The present inventors have deeply reconsidered these points, and conducted a study including detailed compositional distribution of potassium cetyl phosphate, which has hitherto had two problems in its use.

As a result, it was found that with a specific formulation of potassium cetyl phosphate, the hydrophobic properties could be improved by a factor of 11 without deteriorating the spinning or other processability.

That is, for example, potassium cetyl phosphate can be produced by adding powdered phosphorus pentoxide to molten cetyl alcohol, heating and stirring, and then adding it to a concentrated KOH (potassium hydroxide) aqueous solution to neutralize it. However, by variously changing the reaction conditions with alcohol, neutralization conditions, etc., mixtures of various mono-, di-, and poly-potassium cetyl phosphates can be changed.

Monoester Cl81133-0-P-OKOK C+5llss O KOK Potassium cetyl phosphate is easiest and most effective to use alone as a treatment agent, but
Can be used in combination with normal alkyl phosphate potassium. Examples of the normal alkyl phosphate potassium include potassium lauryl phosphate having 12 carbon atoms, potassium myristyl phosphate having 14 carbon atoms,
Examples include potassium stearyl phosphate having a carbon number of I8, and the latter two are particularly preferred. Preferably, the amount of potassium cetyl phosphate used in combination with other potassium normal alkyl phosphates is at least 70% by weight.

In the present invention, the potassium normal alkyl phosphate, particularly potassium cetyl phosphate, has a mono:di:poly blend ratio of 40 to 60:35 to 55:
0-1O1, particularly preferably 45-55:40-50:3
It is preferable that the initial goal is easily achieved when it is in the range of ~7.

Among the potassium alkyl phosphates, potassium cetyl phosphate is the most effective for purposes of the present invention. Although myristialyl and potassium stearyl phosphate have somewhat inferior hydrophobic properties, they are still effective. Potassium lauryl phosphate alone lacks hydrophobic properties and is insufficient to achieve the initial purpose. The processing agent used in the present invention is simplest and most effective when used alone, but it can be mixed with other components within a range of 50% or less, preferably 30% or less. As this mixed component, any desired radish can be selected as long as it does not impair hydrophobic performance and processability. For example, sorbitan (mono)palmitate, cationized polyamide amine, stearic acid monoglyceride, ethylene/adduct of potassium alkyl phosphate, etc. can be used.

The adhesion m of the treatment agent used in the present invention was examined from both processing characteristics and surface hydrophobic characteristics, and the adhesion m of the treatment agent used in the present invention was determined from the viewpoint of both processing characteristics and surface hydrophobic characteristics, and the adhesion m was determined from the viewpoint of both processing characteristics and surface hydrophobic characteristics.
It has been found that 0.05 to 2 weight %, preferably L < C 0.1 to 0.3 weight % is suitable. If m is too small, the effect is poor, and if m is too large, it impairs workability or is wasteful, which is undesirable. The application of treatment agents can be carried out during the production of the fibers, during the processing process, and also on intermediate or final products. In the case of the fiber manufacturing process, it is convenient to use the oiling process that is commonly carried out, and the number of processes does not increase. Alternatively, it can also be applied during the processing process. For example, in the case of fire hose cloth, it can be applied during the process of producing spun yarn, particularly the spinning process or the winding process, or it can be applied after knitting. In the case of a nonwoven fabric for a face cover, it can be applied to raw cotton and then carded, or it can be applied to the nonwoven fabric after carding by spraying or the like. If the treatment agent is a mixed component, application can also be carried out in portions.

Although the present invention is particularly preferably applied to polyester fibers, it can also be applied to other fibers such as polyethylene, polypropylene, polyamide, aromatic polyamide, polyvinyl chloride, etc.

The polyester fibers used in the present invention include aromatic polyesters made of terephthalic acid, aliphatic diols having 2 to 4 carbon atoms, 1,4-hexamedylene dimethanol, naphthalene dicarboxylic acid, etc., and composite fibers or blends thereof. Regarding fibers, polyethylene terephthalate fibers are the most suitable.

In addition to these, it also includes those copolymerized with 20 mol% or less of a third component. Copolymerization components include aromatic dicarboxylic acids such as isophthalic acid and naphthalene dicarboxylic acid, oxycarboxylic acids such as p-oxybenzoic acid and p-β-oxyethoxybenzoic acid, ring dicarboxylic acids such as cyclohexanedicarboxylic acid, , 3-propanediol, 1,6-hexanediol, aliphatic diols such as neopentyl glycol, pentaerythritol, polyethylene glycol, polybutylene glycol, methoxypolyethylene glycol, and sulfoisofucuric acid. Additionally, these polyester fibers contain commonly used additives such as titanium compounds, silica compounds, phosphorus compounds, metal compounds used as catalysts, flame retardants, antistatic agents, pigments, and side reaction inhibitors. May be included.

The present invention will be explained below with reference to Examples, but the present invention is not limited thereto.

Example 1 Polyethylene terephthalate was synthesized and spun using a conventional method to obtain an intrinsic viscosity (phenol:tetrachloroethane=1=
(Measured at 1.30°C) A raw yarn weighing 0.60 d and 7 g was obtained.

After convergence, it was stretched in two stages in a hot water bath at 83 to 95°C, and
A constant length heat treatment was carried out at 0°C, followed by application of aqueous solutions of various processing agents shown in Table 1 below, crimping, drying with hot air at 100°C, and cutting into cotton of 1.25 d x 51 ms. This cotton was spun using a conventional spinning machine. Approximately 0.0% of various processing agents are used.
It was continuously applied to the yarn before circular knitting at a concentration of 2%, dried, and the wicking m of the rubber latex was measured in the yarn state.

The results are shown in Table 1. Compared to the case without a treatment agent (the case of using potassium lauryl phosphate alone), a clear effect of suppressing wicking m was observed. When we made a prototype hose using a circular knitting machine at 40 rotations per minute, we found that the hose treated with potassium cetyl phosphate had better physical properties than a conventional hose that uses a large amount of rubber latex. Not only was there no inferiority to the previous model, but on the contrary, it was recognized that it had advantages such as lighter weight of the hose and improved appearance quality. The following margins are shown in Table 1. Example 2 Polyethylene terephthalate synthesized by a conventional method was spun to obtain the intrinsic viscosity (phenol:tetrachloroethane=I).
: Measured at 1.30° C.) A raw yarn of 0.62 dff/g was obtained. After converging and stretching, an oil agent mainly made of chemical oil containing 5 moles of ethylene oxide added to a higher alcohol was applied, and after processes such as crimping, drying, and cutting, it was made into a 2 d x 51 mm.
I made it into cotton. This cotton was carded to create a dry nonwoven fabric, which was evaluated as a face cover fabric for disposable diapers. At that time, various treatment agents were applied to the raw cotton by spraying to a concentration of about 0.15%. The results are shown in Table 2. Here, the water absorption area value A is measured for raw cotton by the method described in the text.

The spot test in Table 2 was carried out by measuring the spread of water on the cover cloth when water colored with red ink was poured with a pipette on the inside of the rayon cotton covered with the above-mentioned non-woven fabric. .

It can be seen that those treated with the treatment agents No. 1 and No. 2 are effective in preventing colored water from spreading on the cover surface and keeping the surface dry to the touch.

Example 3 Polyethylene terephthalate synthesized by a conventional method was spun and the intrinsic viscosity (phenol:tetrachloroethane=1:l, measured at 30°C) was 0.62 dl! /g of yarn was obtained. After convergence, it is stretched in two stages in a hot water bath at 85-95°C, then heat-treated for a fixed length at 185°C, and then various processing agents are applied to about 0.17% by weight to reduce shrinkage. Kake,
Dry with hot air at 100℃, then cut to 1.25d
It was set as a stable with a diameter of 51 mm. One result shown in Table 1 was obtained for this staple. Furthermore, we evaluated the spinnability of cotton coated with potassium cetyl phosphate.
Card, filament, roving, and spinning all showed good process passability. At this time, the ratio of mono:di:polyphosphate in potassium cetyl phosphate was 52:43:5.

Next, this was circularly knitted and dipped in rubber latex, and the wicking m of the latex was measured. As shown on the right side of Table 3, the wicking was much clearer than the current product (the main component is a 5 mole adduct of higher alcohol EO). A suppressive effect on m was observed. In addition, the hose performance is not only physically comparable to conventional hoses using multi-layer rubber latex, but it also has advantages such as a lighter hose weight and a better appearance. It will be done.

As described below, products treated with potassium myristyl phosphate, potassium stearyl phosphate, etc. show a better inhibitory effect on latex wicking than current products, but potassium cetyl phosphate does not.

That is, when potassium myristyl phosphate and potassium lauryl phosphate were used alone as treatment agents instead of potassium cetyl phosphate, the water absorption area values A were 44 and 45, respectively, and the latex absorption amount was +28 g/- for both. Ta. From now on, the number of carbon atoms in normal alkyl phosphate potassium is 1.
By using potassium cetyl phosphate, which has a characteristic peak at 6 and has a carbon number of 14 and 1,
It can be seen that compared to the use of normal alkyl phosphate potassium (No. 8), the amount of latex absorbed was reduced by about 1%, and the hydrophobic properties were improved.

Table 3 Example 4 Ten raw fibers having an intrinsic viscosity (phenol:tetrachloroethane=I:I, measured at 30°C) of 0.60 dQ/g were obtained by spinning polyethylene terephthalate synthesized by a conventional method. After converging this and stretching it in two stages in a hot water bath at 85 to 95°C, various processing agents were applied to the
%, shrinked by 1 wt., dried with hot air at 130° C., and then cut into staples of 2 d×51 mm. The wicking speed of this staple was measured using the method described in the text. The results are shown in Table 4. Of these, dry nonwoven fabrics were prepared from cotton to which potassium cetyl phosphate was added and evaluated as face covers for disposable diapers, and they showed extremely excellent wetting properties. That is, when water colored with red ink was poured with a pipette onto a disposable diaper with rayon cotton inside and the above-mentioned cover outside, the colored water was absorbed into the inside without spreading to the cover surface, leaving the surface as it was. It was confirmed that it retains a dry feel.

On the other hand, we similarly created and tested nonwoven fabrics using cotton containing potassium lauryl phosphate, and found that
Colored water spread on the cover fabric, making it impossible to maintain a dry feel. Note that the ratio of monodiliary to poly in potassium cetyl phosphate in this example was 50:45:5.

Table 4 □□Shadow] Example 5 The intrinsic viscosity measured in a tetralin solution (30°C) was 1.
50dd/g isotactic polypropylene resin
The yarn was spun from a nozzle at 40°C. After converging these, they were stretched in a hot water bath at 80°C, and then various treatment agents were applied.
It was mechanically crimped, dried and then cut into cotton pieces measuring 2d x 51mm. The wicking rate of this cotton was measured using the method described in the text. The results are shown in Table 5. Since cotton to which potassium cetyl phosphate was added showed the best wicking effect, a nonwoven fabric for face covers for disposable diapers was prepared and evaluated using this cotton. The inner part of disposable diapers is made of a non-woven fabric made from rayon cotton, and is packed with a face cover. When a wetness test was carried out by pouring water colored with red ink onto this disposable diaper with a pipette, the colored water was absorbed into the inside without spreading to the cover surface, and the surface maintained a dry texture.

As a comparative example, a non-woven fabric was similarly prepared using cotton coated with potassium lauryl phosphate and tested. As a result, it was more easily wetted than cotton coated with potassium lauryl phosphate, and the surface dryness could not be sufficiently restored. The mono:di:poly ratio in potassium cetyl phosphate at this time was 52:43:5.

Example 6 Polyethylene terephthalate was synthesized and spun using a conventional method to determine its intrinsic viscosity (phenol:tetrachloroethane=1:
l, measured at 30℃) 0.62dl! /g of yarn was obtained.

After convergence, it was stretched in two stages in a hot water bath at 85 to 95°C.
It was heat-treated for a fixed length at 0°C, then an aqueous solution of the various treatment agents of the present invention was applied, and after crimping, it was dried with hot air at 100°C and cut into cotton of 1.25 d×51 mm. These cottons were spun using a conventional spinning machine. The obtained yarn was circular knitted using a circular knitting machine at 40 revolutions per minute, and then the knitted fabric was immersed in rubber latex. There was no occurrence of fluff during circular knitting at the above-mentioned speed, and the obtained 71;-s was found to have favorable points such as light weight and appearance quality. Furthermore, in Invention Examples 1 and 2, the rotational speed of the circular knitting machine was set to 5 per minute.
Even after increasing the speed to 0 rotations, no wind was observed.

In Table 6, A(ll) and latex wicking amount are the A value measured for raw cotton and the rubber latex wicking amount measured for yarn as in other Examples.

The following is blank Table 6 Patent applicant RiRashi Co., Ltd. Representative Patent Attorney Ken Honda

Claims (1)

[Scope of Claims] 1. Consisting of potassium normal alkyl phosphate containing 70% by weight or more of potassium cetyl phosphate,
A synthetic fiber having a reduced water absorption rate and excellent processability, which is made of a hydrophobic synthetic fiber to which 0.05 to 2% by weight of a surface treatment agent that can reduce the water absorption area value A defined below to 48 or less is attached. Fiber products. Here, the water absorption area value A means that 5 g of raw cotton is packed into a glass tube with an inner diameter of 1 cm and a length of 20 cm, and the temperature is 21 ± 1°C and 62 ± 2%.
This is the value obtained by integrating the wicking rate equation (1) over a period of up to 10 minutes when the end is immersed in water under RH conditions. [l=at^1^/^2 ・・・・・・・・・(1)
where l: wicking length (cm) a: constant of 0<a≦2.27 t: time (minutes)] 2. The blending ratio of potassium cetyl phosphate mono:di:polyphosphate is 40-60:35- 55:0-10
A hydrophobic synthetic fiber product according to claim 1. 3. The hydrophobic synthetic fiber product according to claim 1 or 2, wherein the hydrophobic synthetic fiber is a polyester fiber. 4. The hydrophobic synthetic fiber product according to claim 1 or 2, wherein the hydrophobic synthetic fiber is a polypropylene fiber.