JPS5940945B2 - Method for producing polyester sewing thread with improved sewing properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing polyester sewing thread with improved sewing properties, and more specifically, to a method for producing polyester sewing thread with a specific composition of treatment agent attached to polyester sewing thread, which has excellent high-speed sewing properties and color fastness. The present invention relates to a method for producing polyester sewing thread.

Polyester sewing thread is generally made through the following steps: raw yarn → ply twisting process → doubling process → ply twisting process → heat setting process → dyeing process → finishing process with treatment agent, and has various aspects such as strength, dimensional stability, and heat resistance. It has excellent, well-balanced properties as a sewing thread.

By the way, in the finishing process using the above-mentioned treatment agent, the slip of the polyester sewing thread is improved and the sewing property (sometimes referred to as sewability in the following description) is achieved.

), and for this reason, conventionally, polyester sewing thread has been treated with an emulsion of a processing agent mainly composed of mineral oil and phosphate compounds, an emulsion mainly composed of paraffin wax, or a straight oil agent mainly composed of dimethylpolysiloxane. Was.

Polyester sewing threads treated with such conventional processing agents are used in material applications such as camping tents, batch covers for ships, canopy sheets for automobiles and freight cars, curing sheets for construction,
It is usefully applied in the fields of heavy canvas such as large tents, outdoor sheets, eaves tents, and car seats, bag making, shoes, and footwear.

When sewing the above-mentioned fabric, the fabric itself is not only thick but also has a high weave density, and is also coated with rubber, latex resin, etc., so the electrical conduction resistance of the sewing machine needle is extremely high. Become.

Furthermore, in addition to straight stitching, there are also frequent processes such as overlapping stitching and reverse stitching, so the number of stitches is reduced to 3000r to improve work efficiency.
A high speed region near or above pI[If= is utilized.

In addition, in order to create a normal seam condition such as closure, both the upper thread and the lower thread are sewn with high tension, so the sewing thread rubs against the needle at high speed and high contact pressure, especially near the needle eye.

However, because the needle tip has a small heat capacity, the needle and the material to be sewn, which have a high conduction resistance, can reach high temperatures within a few seconds of starting.

An equilibrium state is reached, with the highest temperature especially around the needle eye.

(Instantaneous means about 250℃ to 300℃) Products for material use are sewn under extremely harsh conditions, but sewing thread treated with conventional treatment agents cannot handle such high temperatures and high contact pressure. .

Under conditions of high-speed repeated friction, the temperature of the sewing thread instantaneously rises to above the softening or melting point of the polyester near the needle eye during sewing, and furthermore, due to shocking tension fluctuations, the thread is likely to break (melt thread breakage) soon after sewing begins, especially at high speeds. Number of stitches 3000r
In the case of l) II) f-, the threads are broken in a few seconds, resulting in a significant decrease in the operating rate, which limits the sewing applications.

In order to prevent such deterioration in sewability due to melted thread breakage, the following may be considered, for example.

(i) Improving the lubricating performance of the oil and preventing solid contact friction between the needle and sewing thread by uniformly adhering the oil, and reducing frictional force to suppress frictional heat generation.

(ii) Improve the form of the sewing thread, such as the twist structure, to reduce the frictional resistance between the needle eye and the sewing thread.

(111) Use a material with good heat resistance as the fiber material for sewing thread, or improve the crystallinity of the fiber polymer to make it less likely to break.

Of the above measures, (11) naturally has its limits and no significant effect can be expected. When limited to polyester-based materials, there are limits to improving physical properties such as crystallinity and improving fusing, and no significant effects can be expected.

On the other hand, regarding (i), techniques for using dihydrocarbon polysiloxane and epoxy silicone oil to improve the lubricity of oil agents have already been disclosed in JP-A-52-27848, JP-A-52-8198, and JP-A-52-8198. Showa 52-2514
It is described in Publication No. 2, Japanese Unexamined Patent Publication No. 51-32896, etc.

However, even with these methods, there are still problems as described below.

(A) When applying oil using a water-based emulsion system, the advantage of the emulsion method is that the oil adheres uniformly, but (A-1) When applying using roller oiling, the concentration is high due to evaporation of water in the emulsion. The amount of adhesion changes over time, resulting in adhesion spots.

Furthermore, as the concentration increases, the emulsion dispersibility becomes unstable, and troubles such as creaming and separation are likely to occur.

(A-2) Spray oiling also has a drawback in terms of adhesion spots.

(A-3) Winding the material into a skein and applying oiling (bank oiling) increases the number of steps such as rewinding, which is disadvantageous in terms of process rationalization.

(A-4) The cheese oiling method is advantageous in terms of uniform adhesion and process rationalization, but discarding the silicone emulsion each time would result in a significant cost increase, especially since silicone lubricants are expensive. .

Additionally, providing a storage tank requires additional space and additional capital investment.

Based on the above, a rational method using an emulsion attachment method would be to apply an oil emulsion to the cheese oiling method, which is low cost and has the advantage of improving sewability. This is only done by oiling, and improvements in lubricity (measures to prevent melting) are not taken into account.

Next, (B) As a feature of the straight type in which the oil solution is directly applied to the sewing thread, an application method using roller oiling is generally adopted.

This is advantageous in terms of streamlining the process, and allows the use of oils that are advantageous in terms of lubricity and sewability, even though they are expensive, without waste. However, as described below, there is a drawback in terms of uniform adhesion. .

That is, as an oil agent, for example, silicone oil, especially dimethylpolysiloxane with a high degree of polymerization, shows a remarkable effect, but the degree of polymerization of the dimethylpolysiloxane is about 20 when converted to viscosity.
The viscosity is preferably 0.00 centistokes or more, but the viscosity is too high for practical use and it is difficult to use it as it is in ordinary equipment such as roller oiling.

Therefore, high viscosity (high degree of polymerization) dimethylpolysiloxane is diluted with a low viscosity silicone oil film or other low viscosity oil.

However, in the case of low-viscosity water-based emulsion processing, the best rate oil has a high viscosity, so the oil film on the oiling roller is thick, and the amount of adhesion fluctuates widely depending on subtle changes in the rotation speed of the roller. However, even if the oil film on the roller is swung with a plate or the like, the spreadability of the oil adhering to the thread is poor, which is disadvantageous in terms of uniform adhesion.

Particularly in this straight oiling method, variations in weight variation are likely to occur, making it difficult to manage uniform adhesion.

Moreover, the conditions for improving the sewability of material-use sewing thread are very strict, so even if you use an oil agent that has good lubricity, it will not be effective unless you apply the appropriate amount and ensure uniform adhesion. There are some aspects that cannot be done.

As described above, the conventional sewing thread manufacturing technology itself has not been able to satisfy all aspects of the sewing characteristics required of polyester sewing thread, including the oil composition.

Therefore, an object of the present invention is to provide a method for producing polyester sewing thread that can sufficiently withstand severe conditions when sewing products for material use and exhibits more preferable sewing properties.

A further object of the present invention is to provide a method for producing polyester sewing thread that not only has excellent running characteristics at the start of sewing but also has improved lubrication performance even during high-speed sewing, and can suppress heat generation due to contact friction with solid objects as much as possible. It is about providing.

Furthermore, another object of the present invention is to provide a method for producing polyester sewing thread with improved sewing properties while also rationally improving the oil processing method and taking into consideration the cost of the oil agent.

In order to achieve the above objective, the inventors of the present invention discovered that in the process of examining various types of sewing machine thread, it was possible to improve the lubricity of sewing thread at low speeds and high contact pressures, and also to improve the sewing performance (lubricity) at high speeds by using only the oiling method. Knowing that there is no such thing and that each required characteristic cannot be satisfied with a single oil component, we continued our research from the perspective of combinations of oil agents, and as a result, we arrived at the present invention.

Thus, according to the present invention, polyester sewing thread contains at least (a) 0.6 to 4.5% of paraffin wax having a melting point in the range of 40 to 80° C. (0) higher fatty acid and polyalkylene, based on the fiber weight ratio. 0.03 to 0.75% of an amide compound with a polyamine and/or a cationic activator obtained by quaternizing them is deposited, and then the average viscosity at 925°C is 0.4 to 4.5% dihydrocarbon polysiloxane with a diameter of 2000 centistics or more) 0.4 to 4.5% mineral oil with a viscosity of 30 to 120 seconds at 25°C.
A method for producing a polyester sewing thread with improved sewing properties is provided, which is characterized in that an oil having a composition shown in B) below is deposited in order to deposit a polyester sewing thread of 1 to 3.0%.

However, (a) 60 to 90% by weight of paraffin wax with a melting point in the range of 40 to 80°C (b) Amide compounds of higher fatty acids and polyalkylene polyamines and/or quaternized 3 compounds
~15% by weight Furthermore, as the main oil component of the treatment liquid (B) containing an emulsifier (c) dihydrocarbon polysiloxane with an average viscosity of 2000 centistokes or more at 25°C.
0 weight) mineral oil with a viscosity of 30 to 120 seconds at 25°C.
It is an oil agent containing 60% by weight.

Regarding this, component (B), which has extremely high lubrication performance but has problems in terms of uniform adhesion, is made relatively inexpensive and used in combination with an oil containing a high content of paraffin wax that allows uniform adhesion through emulsion, thereby improving sewing properties. This is what we have ensured.

In the above-mentioned components (i), (b), (c), and (i) of the present invention, (a).

(B) is uniformly attached to the polyester sewing thread, and (B) contributes to improving sewing performance at high temperatures, high speeds, and high contact pressures, while the other component (B) is applied at low speeds and high speeds at the start of sewing. This ensures lubricity under contact pressure.

In order to further improve lubricity at high speeds,
The components (c) and (b) are further attached.

Furthermore, these components and the means for adhering the components will be explained in detail.

In the present invention, (a) contained in the treatment MIIcA)
The paraffin wax has a melting point of 40 to 80°C, preferably 42 to 73°C.

These are base oils to ensure lubricity at high speeds in relation to component (c), and if the melting point is less than 40°C, the emulsion stability will be poor when a high content of paraffin wax is added. The upper limit of the melting point of is generally at most 80°.

On the other hand, regarding (b) the ester of higher fatty acid and polyalkylene polyamine and/or its quaternized cationic activator, firstly, the fatty acid has a main chain carbon number of C8 to C25.
Among these, examples include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid.

Further, examples of the polyalkylene polyamine include ethylenediamine, diethylenetriamine, triethylenetetramine, etc., which are used in the form of mono and/or amide.

Furthermore, for quaternized cations, the counter ion is Cl,
Contains halogen ions such as Br-, methosulfate, ethosulfate, sulfate, and phosphate.

In addition to (a) and (b), it is preferable to use an emulsifier component as appropriate.

Such treatment agents (XA) are generally used in water-based emulsions, but may also be used in other solvent-based systems.

In view of the gist of the present invention, cheese oiling is the most preferred method of attachment, but case oiling (bank oiling) and roller oiling can also be used.

The emulsion concentration of the processing agent (A) is 0.2 to 20% by weight, and the weight coverage is 1 to 7% by weight, preferably 2 to 5% by weight.

When this processing agent (A) is subjected to cheese oiling treatment, it is uniformly adhered to the inner and outer layers of the cheese.

The paraffin wax contained contributes to improved sewability at high temperatures, high speeds, and high contact pressures, and the proportion thereof is particularly high, particularly at 60% by weight or more, preferably at least 70% by weight.

However, in terms of emulsion stability, it is best to avoid using a weight ratio of 95 or higher.

On the other hand, esters of higher fatty acids and polyalkylene polyamines and/or their quaternized cationic activators improve the lubricity at low speed and high contact pressure, allowing the thread to be pulled out by passing it through the various guides and needles of the sewing machine. To prevent the generation of abnormal tension due to stick-slip between the sewing thread and the metal guide at the time of sewing and at the start of sewing, thereby improving sewing work efficiency.

The amount of this compound used is 3 to 15% by weight, preferably 5 to 15% by weight.
10 is in charge of weight.

Examples of the polydihydrocarbon polysiloxane constituting the -component of the treatment agent (B) include dimethylpolysiloxane, diethylpolysiloxane, and dipropylpolysiloxane, which are usually applied by straight oiling.

Among these silicone oils, those with an average viscosity of 2,000
~100,000 centistoke silicone oil not only has better smoothness than other oils, but also maintains its performance as sewing thread without reducing the oil's original performance even when the sewing machine needle becomes hot during sewing. can be maintained.

It was also found that the higher the viscosity of dihydrocarbon polysiloxane, the higher the high-speed sewing performance.

In this regard, the conventional approach to straight-type lubricants is to dilute dimethylpolysiloxane, which has a relatively low viscosity, to lower the viscosity in terms of workability and ease of handling during roller oiling.

The present invention differs from these concepts in that by diluting (c) with mineral oil, the effect of reducing the viscosity of the entire blended lubricant is greatly effective, and at the same time, the sewing thread does not come into contact with the high-temperature needle eye. It has become clear that the mineral oil in the oil adhering to the needle eye evaporates quickly, and components that are negative for lubrication are easily removed, and the remaining high viscosity silicone easily exhibits lubrication performance.

From the above points of view, as a treatment agent (B), dihydrocarbon polysiloxane has an average viscosity of 2,000 at 25°C.
~100,000 centistokes is used as a single component or a combination of two or more types at a weight ratio of 40 to 90, at 25°C.
Mineral oil having a viscosity of 30 to 120 seconds, preferably 40 to 80 seconds, is used in an amount of 10 to 60% by weight.

If the mineral oil content is less than 10%, there will be little viscosity reducing effect;
If it exceeds % by weight, the desired oil lubricating performance cannot be secured as the amount of silicone oil used decreases.

Furthermore, if the viscosity of the mineral oil is less than 30 seconds, it tends to partially volatilize at room temperature, and there is a concern that the composition may change, especially during oiling at high temperatures in summer.

From this point of view, 40 seconds or more is particularly preferable.

On the other hand, if mineral oil is used for more than 120 seconds, its compatibility with high viscosity silicone oils will decrease.

Of course, in addition to (c) and (d) constituting the oil agent (B), additives that are compatible with mineral oil and silicone oil may be included as necessary to the extent that their functions are not lost.

Examples of these additives include 3 to 10% by weight or preferably 5 to 10% by weight of alkylamine salts of higher fatty acids such as dimethylstearylamine isostearate or dimethylstearylamine oleate as oil film strengtheners. It can be added at a ratio of

The amount of the oil agent (B) deposited is 2 to 5 parts by weight, preferably 3 to 4 parts by weight.

However, even if the above-mentioned measures are taken for the straight oil (B), sewing thread to which straight oil (B) is attached alone is still not sufficient to lower the viscosity as a measure to uniformly adhere the oil, and may instead be caused by uneven adhesion. Instability of sewing performance is unavoidable.

In other words, what the present invention is really aiming at is improving the sewing properties of sewing thread for materials, which are handled under much harsher conditions than those for industrial use, as described above, and for this purpose, (B) cannot be used alone. It is not a solution.

This is where the significance of the present invention lies.First, after applying the treatment agent (A) that can be uniformly adhered to the sewing thread,
Only by further applying the lubricant (B) can the two act synergistically to overcome the severe conditions during sewing.

In addition, the polyester sewing thread as used in the present invention is a sewing thread that mainly contains at least 50% or more of polyethylene terephthalate fibers.

The present invention will be described in detail below with reference to Examples.

Example Material Sewing Machine 5 EIKOLSW-81 model was used, No. 19 sewing needle was used, polyester spun sewing thread #20/3 was used as sewing thread, and the number of stitches was 315 Orpm and 4.
To sew multiple layers of sewing material and measure the time it takes to sew without cutting the sewing thread.

In this case, cheese oiling and after-oiling methods are adopted for the polyester sewing thread as shown in Table 1 CI.
), Cll, l processing agents (A-1 to A-6 and B-1 to
B-5) were deposited in the combinations shown in Tables 2 and 3.

At the same time, Tables 2 and 3 list the evaluation results for sewability along with the amount of each treatment agent attached.

The numbers in Table 1 are A-1 to A-6 and B-1 to B.
For each of -5, the blending weight ratio (%) of each component in (a) to (b) is shown.

For example, for A-1, (A) is 73% by weight of paraffin wax, (D) is 5% by weight of a cation obtained by quaternizing an amide compound of behenic acid and diethylenetriamine, and 22% by weight of an emulsifier. (total 100%).

Therefore, in the polyester sewing thread of /16.1 shown in Table 2, since A-1 is attached at a weight ratio of 2.1 to the fiber, the component (a) above is 1.
53% by weight, containing 0.10505% by weight of component (B)
-1 to the fiber weight ratio, the same <2.1 Since the weight material is attached, (/→ component is dimethylpolysiloxane 20
0.00 centistokes and 0.525% by weight of dimethylpolysiloxane 10,000 centistokes, totaling 1.05% by weight), and contains 1.05% by weight of mineral oil. .

Below, for other numbers, see Tables 1 to 3.
The amount of adhesion can be determined from the table.

Table 2 also lists the evaluation results for seam appearance, but these sewability and seam appearance are based on the scale shown in Table 4.

From Tables 2 and 3, only when each of the components (a), (0), (c), and ii) satisfies the scope of the present invention, the sewing thread's sewability is significantly improved, and the sewing thread is free from tightness, skipped stitches, etc. It can be seen that problems such as deterioration of the appearance of seams are eliminated.

196- The material to be sewn used for the above evaluation was (I) vinylon canvas; Thread usage (warp thread x weft thread) - waterproof and water repellent vinylon base fabric with 20/3 x 20/3 weave density (threads/1 nch) = 60 x 40 The fabric was processed, and the sewability was evaluated by stacking four layers.

(If) Cotton canvas; Thread usage (warp thread x weft thread) = 10/2 x 10/3 Weaving density (strands/1 nch) -47 The sewability was evaluated.

Claims (1)

[Claims] 1. Polyester sewing thread is mixed with at least (a) paraffin wax having a melting point in the range of 40 to 80°C in a weight ratio of 0.6 to 4.5 to the fiber, and (b) higher fatty acids and polyalkylene. In order to deposit 0.03 to 0.75% of an amide compound with a polyamine and/or a cationic activator obtained by quaternizing them, a treatment liquid having the composition shown below as N is deposited, and then a treatment solution for fibers is applied in the same manner. Weight ratio: (/9 Average viscosity at 25℃ is 2000
0.4-4.5% dihydrocarbon polysiloxane of centisto-1x or higher) 0.4-4.5% mineral oil with a viscosity of 30-120 seconds at 25°C.
1. A method for producing polyester sewing thread having improved sewing properties, characterized in that an oil agent having a composition as shown in Table 1) is applied in order to adhere a polyester sewing thread of 1 to 3.0%. θJ treatment solution (a) 60 to 90% by weight of paraffin wax with a melting point in the range of 40 to 80°C (b) Amide compounds of higher fatty acids and polyalkylene polyamines and/or quaternized compounds thereof 3
~15% by weight, and a processing liquid further containing an emulsifier. As the main component of the oil agent (B), (c) a dihydrocarbon polysiloxane having an average viscosity of 2000 centistics or more at 25°C of 40 to 9
0% by weight) mineral oil with a viscosity of 30-120 seconds at 25°C.
The method for producing a polyester sewing thread with improved sewing properties as claimed in claim 1, wherein the processing solution is an aqueous emulsion. 3. The method for producing a polyester sewing thread with improved sewing properties according to claim 1, wherein the application of the treatment liquid in A is a cheese oiling method. 4. The method for producing a polyester sewing thread with improved sewing properties according to claim 1, wherein the oil agent B is applied by a straight oiling method.