JPS6249391B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a treatment agent for sewing thread for tatami edges (hereinafter referred to as sewing thread) using polyester multifilament thread. Traditionally, tatami craftsmen used to sew tatami edges on tatami floors by hand, but in recent years, sewing machines similar to sewing machines that can sew automatically have been developed, and most people now use these machines. It became. By using a sewing machine, we were able to increase speed and make the stitches more uniform, but on the other hand, when sewing a thick tatami floor while tightening it, a very strong impact force is applied intermittently. A fatal problem occurred in which the suture thread broke. In order to withstand this impact force, the sewing thread is made thicker and the surface of the sewing thread is treated with a smoothing agent such as mineral oil, paraffin, silicone oil, etc., so that the sewing thread and the sewing needle and the sewing thread and the tatami flooring material are separated. Methods have been taken to reduce the frictional force and alleviate the impact force, but there is an economic limit to making the thread thicker, and if the amount of smoothing agent is too large, the smoothness will be impaired in times of high humidity. I have not yet arrived at a method that satisfies me. On the other hand, although tatami flooring is extremely thick and highly elastic, it does not have instantaneous rebound properties. Therefore, after sewing while tightening with sewing thread, the tightening gradually loosens, causing the stile to wave, which significantly reduces the commercial value of the tatami. This is due to the inherent weakness of the instantaneous compression recovery force of the tatami floor, but it is also affected by the degree of elongation of the sewing thread. Therefore, in order to reduce the elongation of the sewing thread, a technique has been proposed and implemented in which the sewing thread is impregnated with a thermoplastic resin to bond the fibers together. However, as the bond between fibers is strengthened by the thermoplastic resin, the resistance (stress relaxation property) of the adhesive thread to the impact force exerted by the sewing machine decreases. Currently, sewing threads are processed by appropriately balancing these conflicting performances, but problems such as thread breakage, dropped stitches, and frayed threads still remain, so it is becoming more and more streamlined and faster. This is not necessarily satisfactory in keeping with the sewing technology, and there is a need for the development of a processing agent that can impart even better smoothness. The inventors of the present invention have conducted intensive research on processing agents in order to significantly improve the performance of polyester fiber sewing threads by applying them during the finishing process. To improve,
It is necessary not only to reduce the frictional force when the contact pressure is high against metal, but also to reduce the frictional force when the contact pressure is low (low speed), and to reduce the speed dependence. To alleviate strong impact forces, the conventional method of bonding fibers together using thermoplastic resin is ineffective;
It should be effective enough to reduce the frictional force between fibers and approximate the coefficient of static friction and the coefficient of kinetic friction. (3) The higher the stiffness of the sewing thread after rubbing with high contact pressure than before rubbing, the better the loop formation properties during sewing, the less defects such as dropped stitches will occur, and the elongation of the sewing thread will be reduced. and (4) crystalline paraffin and/or natural wax or synthetic wax, polyoxyalkylene alkylamine, quaternary ammonium salt of amide compound of fatty acid and polyalkylene polyamine, nonionic surfactant. When used in combination, both the high contact pressure friction force against metal and the low contact pressure friction force against metal are significantly reduced, and the static friction coefficient and dynamic friction coefficient between fibers show similar decreases, and the stiffness after rubbing of the sewing thread decreases. The present invention was completed based on the knowledge that it is possible to improve the performance. That is, the present invention emulsifies crystalline paraffin and/or natural wax or synthetic wax, polyoxyalkylene alkylamine, a quaternary ammonium salt of an amide compound of fatty acid and polyalkylene polyamine, and a nonionic surfactant. This is a treatment agent for polyester fiber tatami hem sewing thread, which is characterized by its dispersibility. The crystalline paraffin and/or natural or synthetic waxes used in the present invention include modified waxes or synthetic ester type waxes. Crystalline paraffin and various waxes at high contact pressure preferably have a melting point of 50 to 90°C. If the melting point is below 50°C, the oil film strength will be insufficient under high contact pressure and the oil film will break. Particularly when impact force is applied, the suture thread may melt and break. When the melting point is 90°C or higher, the viscosity during melting increases and frictional force tends to increase due to the generation of adhesive force. Specific examples include linear crystalline paraffin, oxidized paraffin microcrystalline wax, oxidized microcrystalline wax, carnauba wax, and synthetic ester type wax. The polyoxyalkylenealkylamine used in the present invention has the general formula [In the formula, R ₁ represents a linear alkyl group having 12 to 22 carbon atoms, R ₂ and R ₃ represent an alkylene group having 2 to 3 carbon atoms, and 2≦m+n≦10. ] is a compound represented by R ₁ in formula [1] can have carbon atoms in the range of 12 to 22, but is particularly preferably in the range of 18 to 22 carbon atoms. When the number of carbon atoms is less than 12, the smoothing properties of the lubricant are inhibited and evaporation of the lubricant solvent at high temperatures is reduced. On the other hand, when the number of carbon atoms is greater than 22, the viscosity at high temperature melting increases and the frictional force increases due to adhesive force. R ₂ and R ₃ in formula [1] are alkylene groups having 2 to 3 carbon atoms, and may be the same or different. When the oxyalkylene chain m+n is 11 or more, the lubricating performance is decreased and the compatibility with the lubricant is deteriorated, resulting in a significant decrease in the oil film strength improvement effect. The fatty acid used in the quaternary ammonium salt of the amide compound of fatty acid and polyalkylene polyamine used in the present invention preferably has 11 to 21 carbon atoms, and particularly preferably has 17 to 21 carbon atoms. When the number of carbon atoms is less than 11, the ability to reduce frictional force is inferior, and when the number of carbon atoms is greater than 21, the adhesive force increases when melted, resulting in a disadvantage of increasing the frictional force. Examples of polyalkylene polyamines used include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine. The nonionic surfactant used in the present invention is not particularly limited as long as it is nonionic; One or more types of ionic surfactants are used. The composition ratio of the treatment agent of the present invention is, for example, 70 to 90 parts by weight of various waxes, 2 to 10 parts by weight of polyoxyalkylene alkylamine, and a quaternary amide compound of fatty acid and polyalkylene polyamine to 100 parts by weight of the solid content. A range such as 2 to 10 parts by weight of ammonium salt and 10 to 25 parts by weight of nonionic surfactant can be used. When the amount of various waxes is less than 70 parts by weight, smoothness is insufficient and thread breakage may occur. If the amount exceeds 90 parts by weight, emulsification in water becomes difficult and emulsion stability deteriorates significantly, making it unusable. If the amount of polyoxyalkylene alkylamine is less than 2 parts by weight, the oil film of the lubricant will break during high contact pressure, causing thread breakage. If the amount exceeds 10 parts by weight, the smoothness decreases and normal sewing becomes impossible. If the amount of quaternary ammonium salt is less than 2 parts by weight, the dependence of smoothness on yarn speed becomes high and yarn breakage is induced when abnormal tension such as staple slip is applied.
In addition, the frictional force between fibers becomes high, making it impossible to withstand impact force. If it exceeds 10 parts by weight, the frictional force at high contact pressure will increase significantly and cause thread breakage. When nonionic surfactants are used as emulsifiers, their smoothness decreases when they absorb moisture, so it is desirable to keep the amount as small as possible, but from the standpoint of emulsion stability, it is preferable to use a nonionic surfactant that does not interfere with the sewing thread processing process. quantity needs to be used. The processing agent of the present invention is usually used in the form of an emulsion, and is optimally used at an emulsion concentration of 2 to 10% by weight. The treatment agent of the present invention is used in an amount of 1.0 to 10.0% by weight, preferably 2.0 to 10.0% by weight, based on the sewing thread in order to obtain excellent sewing performance.
When 5.0% by weight is attached, a sewing thread having excellent sewing properties suitable for sewing machines can be obtained due to the mutual effect of the wax, polyoxyalkylene alkylamine, and quaternary ammonium salt. The treatment agent of the present invention is applied to the sewing thread in the form of an emulsion, but the sewing thread usually has a total denier.
Many of them are extremely thick, measuring 3000 DE or more, and it is necessary to heat set at 160 to 200° C. under high tension after applying the treatment agent, so the immersion method is preferred as the method of applying the treatment agent. Examples will be specifically illustrated below. Note that the smoothness, stiffness, and stiffness retention after abrasion were measured by the following methods. Further, the units of composition ratios of processing agents in Examples and Comparative Examples are parts by weight unless otherwise specified, and % represents % by weight. [Smoothness] Using an Instron type tensile strength tester, fix one tatami needle to the load cell side, pass the sewing thread through the needle hole, apply a load of 5 kg, and touch it at 180° to measure 20 mm/
It is expressed as the tension when pulled at a speed of min. [Rigidity] The insertion load into a 10mm gap is expressed as rigidity using a Hou-eye meter made by Uenoyama Kiko. [Rigidity retention after abrasion] Sewing thread with 300 g of tension was applied to two S-shaped compensators and a tension controller (7
After one bar) is passed through the yarn at a yarn speed of 30 m/min, the stiffness is measured and the stiffness retention rate is calculated using the following formula. Stiffness after rubbing (g) / Stiffness before rubbing (g) x 100 = Stiffness retention rate (%) Examples 1 to 6 Three 1000 denier polyethylene terephthalate filament high tenacity yarn 250 filaments were combined and twisted. Summer. The treatment agent shown in Table 1 was applied to the sewing thread using an emulsion dipping method, and after drying with hot air at 100℃ for 10 minutes, it was heated at 200℃ under high tension.
A heat set was performed for 30 seconds. The smoothness, stiffness, and stiffness retention rate after abrasion of the thus obtained sewing thread were measured. In addition, an actual machine test was conducted using a sewing machine, and the effects shown in Table 1 were obtained. Comparative Examples 1 to 6 As shown in Table 1, Examples 1 to 6 were carried out in cases where the treatment agent does not contain any of the constituent components of the treatment agent of the present invention or the weight ratio of the treatment agent composition is outside the range of the present invention. The experiment was conducted in the same manner as in 6, and the evaluation results are shown in Table 1. The number of broken threads and number of dropped stitches in the test results using the sewing machine were counted by visual observation as follows. (1) In the case of plain stitching and backstitching The number of times the sewing machine runs out of water when flat stitching and backstitching are applied to 10 tatami mats is the number of thread breaks, and there are both sides of the plain stitching and backstitching on both sides. So (tatami) 10
(sheets) x (plain stitch) 2 (times) x (reverse stitch) 2 (times) =
This is the number of thread breakages (in total) when sewing was performed 40 times using a sewing machine. In addition, the number of dropped stitches (k) is the number of dropped stitches that are counted by visual inspection when the upper thread and lower thread do not intertwine smoothly and cause dropped stitches. (2) In the case of frame stitching In this case as well, the evaluation results are for 10 tatami mats, but since there is no turning, in this case the results are obtained when stitching is performed 10 x 2 = 20 times.

【table】

[Table] Treatment agent of the present invention containing wax, a polyoxyalkylene alkylamine, a quaternary ammonium salt of an amide compound of a fatty acid and a polyalkylene polyamine, and a nonionic surfactant as shown in Examples 1 to 6. The sewing thread to which is attached exhibits excellent sewing performance. However, as shown in Comparative Examples 1 to 5, when one component is removed from the treatment agent of the present invention, the sewing thread has poor sewing performance. decreases.

Claims (1)

[Claims] 1. Crystalline paraffin and/or natural or synthetic wax, polyoxyalkylene alkylamine, quaternary ammonium salt of an amide compound of aliphatic and polyalkylene polyamine, and nonionic surfactant are blended. A treatment agent for polyester fiber tatami hem sewing thread characterized by being emulsified and dispersed. 2. One or more types of crystalline paraffin and/or natural waxes, modified waxes, and synthetic ester waxes with a melting point in the range of 50 to 90°C are solidified.
1. The processing agent according to item 1, which is blended in an amount of 70 to 90 parts by weight per 100 parts by weight. 3 Polyoxyalkylenealkylamine has the general formula [In the formula, R ₁ represents a linear alkyl group having 12 to 22 carbon atoms, R ₂ and R ₃ represent an alkylene group having 2 to 3 carbon atoms, and 0≦n+m≦10. R ₂ and R ₃ and n and m may be the same or different. ] 2 to 10 parts by weight of the compound represented by
The processing agent according to item 1 or 2, wherein the treatment agent is blended in parts by weight. 4 A fourth compound prepared by condensing a bisamide compound of a fatty acid having 11 to 21 carbon atoms and a polyethylene polyamine having 3 to 6 amino groups with epichlorohydrin.
2 to 100 parts by weight of solid ammonium salt
3. The processing agent according to any one of items 1 to 3, which contains 10 parts by weight. 5. The treatment agent according to item 1, which contains 6 to 25 parts by weight of one or more of an ester type nonionic surfactant and an ether type nonionic surfactant based on 100 parts by weight of the solid material. .