JPS6155267A - Production of low extensible yarn - 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 (a) Field of Industrial Application The present invention relates to a method for producing a yarn containing at least 50% polyvinyl alcohol synthetic fiber, low elongation and low creep rate.

(b) Conventional technology Hemp yarn, a natural fiber, has been well known as a yarn with low elongation and low creep rate, and is used for industrial materials such as warp for tatami mats, banking cloth for carpets, and sewing thread. It is widely used in the field of warps for tatami mats, and is the mainstream of high-quality products.

The reason why warp threads for tatami facing need to have low elongation and low creep rate lies in the shaping property of tatami facing.

In other words, for high-quality tatami mats, 240 to 280 rushes/10 cm are used.
The warp tension during weaving is set to 2 to 3 kg.
If you don't do that, you won't be able to hit that many.

After weaving, the tension is returned to the surface of the tatami, which is commonly known in the industry as ``gyomidare'' (the tatami's grain is not evenly arranged) or ``shikami''.
``Sagging J, ``Nami Uchi'' (The grass on the tatami surface is not uniform)
Phenomena such as this may occur.

The occurrence of these phenomena is mostly related to the physical properties of the warp threads, and is difficult to occur with hemp yarn, while it occurs frequently with synthetic fibers with high elongation, and although it can be prevented by extremely reducing the tension during weaving. On the other hand, the number of rushes that need to be inserted is reduced, making it impossible to obtain a high-quality product.

In addition, after weaving, a certain tension is maintained in the warp threads as a tatami face, but if the warp threads have a high creep rate even if they are yarns with low elongation, the creep rate will gradually increase over time due to so-called creep. Plastic deformation, that is, plastic elongation occurs, and phenomena such as "rowing" similar to those described above occur on the tatami surface, deteriorating the appearance. Therefore, the warp for tatami facing needs to have low elongation and low creep rate.
The lower the better, the physical properties include tensile strength of 8 kg or more, breaking elongation of 8% or less, tensile stress of 8 k+r elongation of 3.5% or less, and creep rate (6 kg?Iir! 1
Elongation after standing for a period of time) must be 4.5% or less.

By the way, although hemp thread has low elongation and low creep rate as mentioned above, it is expensive, has low strength, has large irregularities in thread thickness, and has a hard thread surface. During warping or 11! ! Synthetic fibers with low elongation often break during weaving or cause grass breakage, resulting in a decline in productivity and quality.Therefore, synthetic fibers with low elongation are generally inexpensive and easy to obtain with high strength. In addition, it is desired that a yarn with a low creep rate be produced. However, with synthetic fibers, even if the problems of uneven yarn strength and thickness can be solved, there are major difficulties in obtaining yarn with low elongation and low creep rate. In other words, it is generally known that the elongation and creep rate of synthetic fibers decrease to some extent when hot-drawn, but as a characteristic of polymeric materials, rapid plastic deformation during hot-drawing changes over time. However, it has a tendency to return to its original shape, so it must be hot-stretched and heat-set at a stretching rate higher than that required to obtain the target elongation. This results in hot stretching, which results in breakage before the target elongation is achieved.

(C) Problems to be Solved by the Invention The present invention focuses on polyvinyl alcohol-based synthetic fibers (hereinafter referred to as vinylon fibers) as synthetic fibers, and uses yarn containing at least 50% of vinylon fibers to prevent excessive The object of the present invention is to provide a method for easily producing yarn with low elongation and low creep rate without hot drawing.

(d) Means and action for solving the problems The present invention includes:
A yarn containing at least 50% polyvinyl alcohol synthetic fiber is treated with a resin solution containing a cellulose-reactive resin and a crosslinking agent during or after hot stretching so that the elongation at break is 8% or less. This is a method for producing a low elongation yarn.

That is, the feature of the present invention is that in order to obtain a yarn with a low elongation at break of 8% or less and a low creep rate,
i) hot stretching a yarn containing at least 50% vinylon fibers so that the elongation at break is 8% or less;
i) During or after the hot stretching, the yarn is treated with a resin liquid consisting of a cellulose-reactive resin and a crosslinking mediator.

In the present invention, as mentioned above, by making at least 50% of the material fibers of the yarn to be vinylon fibers, a yarn with low elongation can be easily obtained by hot drawing, and the reactivity in the vinylon fiber molecules can be easily obtained. Due to the presence of abundant 011 groups, the stretching effect is fixed by reacting with the cellulose-reactive resin, and the crosslinking agent added to the resin liquid is interposed between the vinylon fiber and the cellulose-reactive resin. It is presumed that the stretching effect of the drawn yarn can be more firmly fixed by bridging and integrating the two, and it is possible to easily achieve low elongation and low elongation without excessive hot drawing. A yarn with a high creep rate can be obtained.

In the present invention, as described above, a yarn containing at least 50% vinylon fiber is used. Vinylon fiber is manufactured by dissolving polyvinyl alcohol in water and spinning it from a spinneret into a coagulation bath.The coagulation baths include: i) a saturated sodium sulfate bath, ii) a caustic soda bath, ii)
i) Using the mixed bath of i) and ii') above, i
v) Boric acid is added to a polyvinyl alcohol aqueous solution and spun in an alkaline sodium sulfate bath.
Further, V) a so-called dry spun product in which an aqueous polyvinyl alcohol solution is spun into the air through a spinneret and dehydrated and coagulated in hot air can also be used. These vinylon fibers may be non-acetalized or acetalized, but non-acetalized vinylon fibers are more preferred from the viewpoint of stretchability and reactivity.

Vinylon fibers are used as filament yarns or spun yarns. In the case of filament yarn, use multifilament TX yarn or polyester synthetic fiber.

Less than 50% of other synthetic fiber filaments such as polyolefin synthetic fibers such as polypropylene and polyethylene may be mixed and twisted. In the case of spun yarn, it may be either tow spun yarn or cut spun yarn, or it may be blended with less than 50% of other types of fibers. As the fibers to be blended, cotton, rayon fibers, etc. are effective, but the various synthetic fibers mentioned above can also be used.

In the present invention, the yarn containing 50% or more of the vinylon fibers is hot-stretched so that the elongation at break becomes 8% or less. The hot drawing rate may be appropriately selected within a range such that the cutting elongation of the yarn after drawing is 8% or less as described above, and although it depends on the yarn quality,
A range of 30% to 30% is appropriate, and usually 3 to 15% is sufficient. The hot drawing temperature can be selected as appropriate between 100°C and 300°C, but it is easier to obtain a yarn with a lower elongation at a higher temperature.
It is usually carried out at 150°C to 250°C. Although heat setting may be performed after hot stretching, it is not always necessary, and fixation can be effectively achieved by resin liquid treatment.

Next, in the present invention, in order to fix the arrangement state of fiber molecules given to the yarn by the above-mentioned hot drawing, maintain a low elongation, and reduce the creep rate, Afterwards, the yarn is treated with a resin solution. The resin used is
Cellulose-reactive type, urea-based.

Melamine-based, glyoxal-based, triazine-based.

These include uron series and their modified forms. Alternatively, a mixture of these resins may be used. Vinylon fibers are reactive with the above-mentioned cellulose-reactive resins, and although these resins alone function to some extent as crosslinking agents between fiber molecules, in order to fix the hot stretching effect that is the objective of the present invention, is still insufficient and requires the addition of a crosslinking mediator. It is thought that the crosslinking mediator is interposed between the vinylon fiber and the cellulose-reactive resin and causes a crosslinking reaction between the two.
Acids or salts such as 1+TI+Si+Cr+Cu and Zr+S'rt are used, but boric acid and borax are the easiest to use in view of the stability of the resin liquid and the coloring of the treated yarn.

The resin liquid composition has a cellulose-reactive resin concentration of 0.5 to 20% by weight, and the crosslinking mediator is preferably in the range of 1 to 50 M%/resin, and if it is less than 1% by weight/resin, the effect is insufficient. Also, even if more than 50% by weight/resin is used, the effect remains the same and it is uneconomical, so 5 to 30% by weight/resin is usually preferable. ~9
It is desirable to adjust it appropriately within this range, taking into consideration the stability, reactivity, etc. of the resin liquid.

In the treatment with a resin liquid, the yarn before hot drawing or the yarn after hot drawing is immersed in the resin liquid and squeezed to adjust the adhesion amount. The amount of adhesion may be in the range of 0.5 to 20% by weight/thread as solid content, and 0% by weight/thread is the most efficient.After applying the resin liquid, before hot stretching. In the case of a yarn of
℃, 1 to 30% stretching is carried out for 20 to 90 seconds, hot stretching and curing in resin treatment can be carried out simultaneously, and in the case of yarn after hot stretching, after pre-drying or pre-drying. 20 to 18 at 100℃ to 200℃
These series of processes, including curing for 0 seconds, are performed under tension.

By oiling the yarn that has been treated with the resin liquid, smoothness and moisture resistance can be imparted to the yarn, and the influence of humidity changes on the yarn can be prevented. In this case, mineral oil, vegetable oil, or animal oil can be used as the oiling agent, but in consideration of smoothness and moisture resistance, mineral oil-based silicone oil is preferable, and the amount of oiling agent applied is 1 to 203i. It may be determined as appropriate within the range of %/thread. Also, when used for warps for tatami mats and backing cloth for carpets, insect repellents,
Antifungal agents and the like can be treated at the same time as oiling agents.

(e) Examples Example 1 A 1.1 d non-acetalized vinylon fiber tow, which had been spun in a mirabilite bath using a conventional method, was parlock spun to obtain a spun yarn with a count of 1.5. The yarn physical properties were a tenacity of 18 kg and an elongation of 11%. This yarn was hot-stretched by 8% at 230°C, and the resin liquid [
Melamine resin SR-M-3 (Suman Chemical Industrial District) 40g
/j! , resin catalyst SR-ACX 10% by weight/resin D,
(A) A acid 5 g/1. (B) rt! 10g/2
(pH: 8.0)), squeezed to adjust the adhesion amount, and heated in hot air at 100℃ for 20 minutes.
Pre-drying for seconds followed by curing at 200°C for 4-5 seconds. All treatments were performed under tension.

Comparative example 1. The process was carried out in the same manner as in the above example except that boric acid was not added to the resin solution. Also, comparative example 2. The same procedure was followed except that a polyvinyl acetate emulsion: Boncoat 2830 (Dainippon Ink & Chemicals KK) was used instead of the resin solution in the above example.

Changes in elongation of each yarn were measured by oral administration, and various physical properties were measured on the 8th day after treatment. Figure 1 shows the change in elongation over time.
Various physical property values are shown in Table 1.

The physical properties were measured according to JIS L-1067, and the creep rate was set at a load of 6 kg. Also, the resin adhesion amount is JIS L-1
Measured according to 047.

As shown in Table 1 and Figure 1, the yarn obtained by adding boric acid, a crosslinking mediator, to the resin solution has a small change in elongation due to oral administration, a large elongation fixing effect, and a low creep rate. Comparative example 1 using only melamine resin with low cellulose reaction type resin. The yarn of Comparative Example 2 was treated with polyvinyl acetate emulsion. Both the elongation change over time and the creep rate are lower than the first yarn of the present invention, but it is considerably larger than the yarn of the example of the present invention using a crosslinking agent. The effect of the combined use of a reactive resin and a crosslinking mediator is extremely significant.

Example 2゜Unacecooled 5d spun in a sodium sulfate bath according to a trial decision
1 obtained by parlock spinning vinylon fiber tow
, 2nd yarn (strength 22.1 kg, elongation 12.0%)
was hot-stretched at 230°C by 10%, and then diluted with boric acid lOg/I
The sample was immersed in a resin solution containing T (pH: 8.0), the amount of adhesion was adjusted by squeezing with a roller, and then dried and cured at 180° C. for 590 seconds. As resins, (C) urea-formalin resin Beckamine N117T (Dainippon Ink & Chemicals Co., Ltd.) 50 g/l and (D) glyoxal resin SR-MS-11 (Sumitomo Chemical Co., Ltd.) 50 g/l were used, respectively. Catalyst 5RACX 10% by weight/resin was added.

Comparative example 3. The treatment was carried out in exactly the same manner as in Example (C) above, except that the hot stretching ratio was set to 0%, and Comparative Example 4. The treatment was carried out in exactly the same manner as in the above example, except that a treatment solution containing only LO g/l of boric acid and no resin was used. The physical properties of each yarn were measured in Example 1. The same procedure as above was carried out, and the results shown in Table 2 were obtained.

Furthermore, the yarn of Example (C) and Comparative Example 3. The yarn was used as the warp for the tatami facing. The tension during weaving was 2.5 kg in both cases, and the rush was woven at a density of 280/10 cm. As a result, the yarn according to the present invention caused no problems in shaping the tatami surface, and a high-quality tatami surface with an excellent appearance was obtained. In the case of using the yarn of - The obtained tatami surface has "shikami" and "barrel" Table 2 Table 3 *: 6k [r The value after 30 minutes because it was cut at a load of 1 hour.

"Mi" occurred.

Example 3 First and second threads obtained by parlock spinning C2 (E) 3D non-acetalized vinylon fiber tows spun in a mirabilite bath as raw yarns, and (F) a boric acid-added polyvinyl alcohol aqueous solution were placed in an alkaline mirabilite bath. The spun 3D non-acetalized vinylon fiber tow was parlock spun, and using the obtained 1st and 5th threads, a weak tension was applied to each thread to form a resin solution [urea melamine resin 5R-U open (inhabitant)] K) 50g/l for chemical industry.

Catalyst 5 g/l, boric acid 10 g/l, pn:s, o)
After adjusting the adhesion amount with a roller squeeze, 240'
8% hot stretching was performed at C. Next, silicone oil (viscosity 250 cp) was applied with a roller touch and the film was wound up. The physical properties of the obtained yarn were measured in the same manner as in Example 1. Dimensional stability (20°C, R165% room, base length 1m, load 0.03 g/d, impregnated with water, left for 24 hours to determine the rate of change in length.N was also measured.Reference) As an example, the physical properties of hemp thread (hemp count 1.5) were also measured.The results are not shown in Table 3.

As is clear from the description in Table 3, the yarn obtained by the present invention has overwhelmingly superior strength compared to hemp yarn.
Furthermore, it has equivalent or better physical properties in terms of elongation, creep rate, and two-dimensional stability.

(f) Effects of the invention The present invention provides low elongation, which has not been seen in conventional synthetic fibers.
Moreover, a yarn with a low creep rate can be easily obtained, and when used as a warp for tatami facing, even if the yarn has a normal thickness of about 1 to 1.5 count, the tension during weaving can be reduced to 3 kg. It is possible to make more than 280 rushes/IOCI
m or more, it has extremely good tatami surface uniformity, exhibits performance far superior to hemp thread, and is also extremely useful for carpet banking cloths, sewing threads, etc.

[Brief explanation of drawings]

FIG. 1 is a graph showing the change in elongation of the yarn obtained by the present invention due to oral administration.

Claims (1)

[Claims] (1) At least 5 polyvinyl alcohol synthetic fibers
0% is treated with a resin solution containing a cellulose-reactive resin and a crosslinking agent during or after hot stretching so that the elongation at break becomes 8% or less. Method for manufacturing elongation yarn.