Sewing thread as well as preparation method and use method thereof

Abstract

The invention belongs to the field of spinning, and discloses a sewing thread and a preparation method and a use method thereof, the sewing thread comprises a base line and a hydrogel coating, the base line is formed by twisting or weaving high-strength fine denier polyester industrial yarn, and the hydrogel coating is coated on the surface of the base line. The hydrogel coating comprises hydrogel particles, polyacrylate and a solvent, the mass concentration of the hydrogel particles is 5-20%, and the mass concentration of the polyacrylate is 10-30%. The surface smoothness of the sewing thread can be greatly improved after the sewing thread is soaked in water, the friction force between the sewing thread and a sewn object during use is reduced, meanwhile, the heat dissipation and cooling effects can be achieved through moisture volatilization, the sewing speed is further increased, and the sewing efficiency is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of textiles, and more specifically, relates to a sewing thread, its preparation method, and its usage method. Background Technology

[0002] Sewing thread refers to yarn used for sewing textiles, plastics, leather products, and binding books. It is characterized by high strength, good abrasion resistance, creep resistance, and weather resistance, and must meet requirements for sewing capability, durability, and appearance quality. High-strength sewing thread made from fine denier polyester industrial yarn has high sewing strength and is mainly used in high-end sewing thread applications for special purposes.

[0003] However, ordinary fine denier polyester industrial sewing thread has a high surface friction coefficient, and in industrial applications, the sewing speed is very high in pursuit of efficiency. Therefore, the frictional heat generated between the thread and the workpiece during the sewing process is significant. At higher temperatures, the polymers in ordinary fine denier polyester industrial sewing thread undergo relaxation, and their aggregated structure changes, leading to a decrease in thread strength and the possibility of thread breakage during sewing. To solve this problem, two approaches are needed: reducing the sewing speed and improving the quality of the thread. Reducing the sewing speed obviously affects production efficiency, while improving thread quality generally means increasing the thread's breaking strength.

[0004] Chinese patent application CN202111127600.0 discloses a polyester industrial yarn for sewing thread and its production method. The polyester industrial yarn is composed of multiple fiber groups, wherein the fibers are composed of polyester melt. The production method includes: polyester preparation; spinning; drawing; and winding. This technology ensures that the polyester industrial yarn is composed of polyester melt, and the polyester melt undergoes pressure esterification treatment, resulting in strong resistance to breakage.

[0005] Chinese patent application CN201811614107.X discloses a polyester industrial yarn for industrial sewing thread and its preparation method. The method involves preparing the polyester industrial yarn for industrial sewing thread by solid-state polycondensation and spinning of modified polyester melt. The preparation method of the modified polyester before solid-state polycondensation involves uniformly mixing terephthalic acid, ethylene glycol, a diacid with tert-butyl side groups, a diol with trimethylsilyl side groups, and Sb₂O₃ powder modified with metal oxide doping, followed by esterification and polycondensation reactions. The diacid with tert-butyl side groups is 5-tert-butyl-1,3-phthalic acid, 2-tert-butyl-1,6-hexamethylenedicarboxylic acid, 3-tert-butyl-1,6-hexamethylenedicarboxylic acid, or 2,5-di-tert-butyl-1,6-hexamethylenedicarboxylic acid. The resulting polyester industrial yarn has high dye uptake and a high K / S value.

[0006] Chinese patent application CN201510881728.4 discloses a processing device for fine denier polyester industrial yarn for sewing thread. This device, from top to bottom, consists of a spinning box, a post-heater, a spinning duct, a drawing and heat-setting mechanism, and a winding mechanism. The spinning box comprises an outer box, an inner cylinder, a metering pump, a melt distribution pipe, and spinning components. The drawing and heat-setting mechanism employs a five-roller structure, where the first pair of rollers are cold rollers, the second and third pairs are medium-temperature rollers, the fourth pair is a sub-high-temperature roller, and the fifth pair is a high-temperature roller. Using this processing device, the fineness of the sewing thread can be controlled below 250D, while its breaking strength is above 6.8 cN / dtex.

[0007] Therefore, to solve the problem of suture breakage, the main research has focused on improving the tensile strength of sutures, but the potential for improvement in suture tensile strength is already very limited. How to prevent suture breakage during the suturing process remains a problem that needs to be solved.

[0008] In view of this, the present invention is proposed. Summary of the Invention

[0009] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a sewing thread, its preparation method, and its usage method. The sewing thread of this invention has significantly improved surface smoothness after being soaked in water, reducing the friction between the sewing thread and the workpiece during use, thus reducing thread breakage. Simultaneously, the evaporation of water also helps to dissipate heat and lower the temperature, further accelerating the sewing speed and greatly improving sewing efficiency.

[0010] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0011] The present invention provides a sewing thread comprising a baseline and a hydrogel coating, wherein the baseline is made of high-strength fine denier polyester industrial yarn twisted or woven, and the hydrogel coating is applied to the surface of the baseline.

[0012] The hydrogel coating solution includes hydrogel particles, polyacrylate, and solvent, wherein the mass concentration of the hydrogel particles is 5-20%, and the mass concentration of the polyacrylate is 10-30%.

[0013] This invention provides a water-lubricated sewing thread obtained by coating a base made of high-strength fine-denier polyester industrial yarn with a hydrogel coating. After soaking in water, the surface smoothness of this sewing thread is greatly improved, reducing friction between the thread and the workpiece during use, minimizing thread breakage, and accelerating sewing speed, thereby increasing sewing efficiency.

[0014] The sewing thread of this invention is first soaked in water during use. The hydrogel on the surface of the thread can absorb a large amount of liquid water. Firstly, the smoothness of the thread surface can be greatly improved, which can reduce the friction between the thread and the sewn object during use. Secondly, if the temperature of the thread rises during use, the evaporation of water can also play a role in heat dissipation and cooling, which is more conducive to improving the sewing speed and thus improving the sewing production efficiency.

[0015] In a further embodiment, the solvent is acetone or dichloroethane.

[0016] In a further embodiment of the present invention, the hydrogel particles are selected from at least one of homopolymers or copolymers of acrylic acid and / or acrylamide. That is, they can be homopolymers of acrylic acid or acrylamide, copolymers of acrylic acid and acrylamide, or mixtures thereof.

[0017] Furthermore, at 25°C, the hydrogel particles have a saturated water absorption rate of more than 1000% for pure water. The preparation process of the hydrogel particles in this invention can adopt existing conventional methods, as long as the prepared hydrogel particles have a saturated water absorption rate of more than 1000% for pure water.

[0018] Preferably, at 25°C, the saturated water absorption rate of the hydrogel particles to pure water is greater than 2000%.

[0019] As an alternative implementation method, the preparation method of hydrogel particles includes:

[0020] An aqueous solution of acrylic acid and / or acrylamide monomers, initiator and crosslinking agent is prepared in a certain proportion and reacted at a constant temperature of 60°C for 2 hours to obtain a hydrogel. The hydrogel is then dried, pulverized and ground to form micron-sized hydrogel particles.

[0021] The above method for preparing hydrogel particles can obtain hydrogels with high water content, while improving the adhesion stability and water resistance of the hydrogels. The water content of the hydrogel particles exceeds 1000%.

[0022] Furthermore, the hydrogel particles are micron-sized particles;

[0023] Furthermore, the particle size of the hydrogel particles is 10–300 micrometers.

[0024] In the hydrogel coating solution of the present invention, the particle size of the hydrogel particles is controlled at the micrometer level, which can reduce the amount of coating applied, control the coating thickness, and also facilitate uniform coating.

[0025] In a further embodiment, the coating rate of the hydrogel coating solution is 1-6% based on the mass of the hydrogel particles;

[0026] Preferably, the coating rate is 2%-3%.

[0027] In this invention, the coating rate is controlled between 1% and 6%. If the coating rate is too low, the water absorption during use will be small, failing to achieve the desired effect. Conversely, if the coating rate is too high, it will cause difficulties in sewing, lead to waste, and increase costs. Experiments have shown that controlling the coating rate to 2%-3% yields the best results.

[0028] In this invention, the coating rate, measured by the mass of the hydrogel particles, refers to the percentage of the mass of the hydrogel particles to the baseline mass.

[0029] In a further embodiment, the baseline is made of 20-300 dtex high-strength fine denier polyester industrial yarn through twisting or weaving.

[0030] A further option involves using high-strength fine denier polyester industrial yarn to form the baseline, wherein the strength of the high-strength fine denier polyester industrial yarn is 5.0 to 8.5 cN / dtex.

[0031] In a further embodiment, the linear density of the sewing thread is 20–300 dtex, and the breaking strength is 6–8 cN / dtex.

[0032] This invention provides a method for preparing sewing thread as described in any of the above-described schemes or combinations thereof, comprising:

[0033] (1) Preparation of baseline and hydrogel coating solutions;

[0034] (2) Apply the hydrogel coating solution to the baseline surface and dry to obtain the sewing thread;

[0035] Preferably, the hydrogel coating solution is applied to the baseline surface using a spraying or pressure dipping method.

[0036] This invention provides a method for using sewing thread as described in any of the above-described solutions or combinations thereof, comprising:

[0037] Before use, soak the sewing thread in water for 20-60 minutes at a temperature of 10-30℃.

[0038] Sewing thread is first soaked in water during use. The hydrogel on the surface of the thread can absorb a large amount of liquid water. Firstly, the smoothness of the sewing thread surface is greatly improved, which can reduce the friction between the sewing thread and the sewn material during use. Secondly, if the temperature of the sewing thread rises during use, the evaporation of water can also play a role in heat dissipation and cooling, which is more conducive to improving sewing speed and thus improving sewing production efficiency.

[0039] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0040] 1. This invention obtains water-lubricated fine denier polyester industrial yarn for sewing thread by coating the surface of high-strength fine denier polyester industrial yarn with a hydrogel coating solution. After soaking in water, the surface smoothness of this sewing thread is greatly improved, reducing the friction between the thread and the sewn material during use and minimizing breakage.

[0041] 2. The fine denier polyester industrial yarn used in this invention for sewing thread is first soaked in water during use. The hydrogel on the thread surface can absorb a large amount of liquid water, which greatly improves the smoothness of the thread surface and reduces the friction between the thread and the workpiece during use. Secondly, if the thread temperature rises during use, the evaporation of water can also play a role in heat dissipation and cooling. This is beneficial for increasing sewing speed and thus improving sewing production efficiency.

[0042] 3. In this invention, by strictly controlling the properties of the hydrogel used and the amount of hydrogel coated on the baseline, the adhesion stability and water resistance of the hydrogel are improved, thereby realizing the preparation of water-lubricated fine denier polyester industrial yarn sewing thread. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] Example 1

[0045] (1) Use 8 strands of fine denier polyester industrial yarn with a linear density of 100 dtex to weave the baseline.

[0046] (2) Synthesis and preparation of polyacrylic acid hydrogel particles: Acrylic acid monomer, initiator and crosslinking agent were mixed in a certain proportion (acrylic acid, N,N'-methylenebisacrylamide, ammonium persulfate, mass ratio 200:1:20) to prepare an aqueous solution. The solution was reacted at 60°C for 2 hours to obtain a hydrogel. The hydrogel particles were then dried, pulverized and ground to obtain micron-sized hydrogel particles with a particle size of 50 micrometers. The saturated water absorption rate of the hydrogel particles at 25°C was 2700%.

[0047] (3) Prepare a hydrogel coating liquid by mixing hydrogel particles, polyacrylate and solvent in proportion, wherein the mass concentration of hydrogel particles is 20%, the mass concentration of polyacrylate is 30%, and acetone is used as solvent.

[0048] (4) The polyacrylic acid hydrogel coating liquid is uniformly coated on the baseline surface by pressure impregnation. The coating rate of the hydrogel coating liquid is controlled at 2% based on the mass of the hydrogel particles. After drying, water-lubricated fine denier polyester industrial yarn is obtained.

[0049] Example 2

[0050] (1) Use 6 strands of fine denier polyester industrial yarn with a linear density of 75 dtex to twist into a baseline.

[0051] (2) Synthesis and preparation of polyacrylamide hydrogel particles: Acrylamide monomer, initiator, and crosslinking agent were mixed in a certain proportion (acrylamide, 1,2-divinylbenzene, and azobisisobutyronitrile, mass ratio 200:10:6) to prepare an aqueous solution. The solution was reacted at 60℃ for 2 hours to obtain a hydrogel. The hydrogel was then dried, pulverized, and ground to prepare micron-sized hydrogel particles with a particle size of 200 micrometers. The saturated water absorption rate of this hydrogel in pure water at 25℃ is 2600%.

[0052] (3) Prepare a hydrogel coating liquid by mixing hydrogel particles, polyacrylate and solvent in proportion, wherein the mass concentration of hydrogel particles is 10%, the mass concentration of polyacrylate is 20%, and acetone is used as solvent.

[0053] (4) The hydrogel coating liquid is uniformly coated on the baseline surface by spraying. The coating rate of the hydrogel coating liquid is controlled at 6% based on the mass of the hydrogel particles. After drying, water-lubricated fine denier polyester industrial yarn is obtained.

[0054] Example 3

[0055] (1) Use 10 strands of fine denier polyester industrial yarn with a linear density of 50 dtex to twist into a baseline.

[0056] (2) Synthesis and preparation of polyacrylamide hydrogel particles: Acrylic acid monomer, acrylamide monomer, initiator and crosslinking agent are mixed in a certain proportion (acrylamide, acrylic acid, N,N′-methylenebispropylene, potassium persulfate, ratio of 60:200:1:2) to prepare an aqueous solution, and reacted at 60℃ for 2h to obtain hydrogel. Then, the hydrogel is dried, crushed and ground to prepare micron-sized hydrogel particles with a particle size of 250 microns.

[0057] The hydrogel has a saturated water absorption rate of 2500% when using pure water at 25°C.

[0058] (3) Prepare a hydrogel coating liquid by mixing hydrogel particles, polyacrylate and solvent in proportion, wherein the mass concentration of hydrogel particles is 10%, the mass concentration of polyacrylate is 20%, and acetone is used as solvent.

[0059] (4) The hydrogel coating liquid is uniformly coated on the baseline surface by spraying. The coating rate of the hydrogel coating liquid is controlled at 3% based on the mass of the hydrogel particles. After drying, water-lubricated fine denier polyester industrial yarn is obtained.

[0060] The water-lubricated fine denier polyester industrial yarn sewing threads prepared in each embodiment were immersed in water at 30°C for 1 hour and their performance was tested. The results are shown in Table 1.

[0061] Comparative Example 1

[0062] This comparative example refers to Example 1, which differs from Example 1 in that: the baseline is woven from 8 strands of fine denier polyester industrial yarn with a linear density of 100 dtex, and the surface of the baseline is not coated with hydrogel, and it is used directly as sewing thread.

[0063] Effect of hydrogel water absorption rate on Comparative Example 2

[0064] The difference between this comparative example and Example 1 is that the hydrogel particles have a saturation water absorption rate of 200% for pure water.

[0065] Effect of the coating rate of hydrogel particles in Comparative Example 3

[0066] The difference between this comparative example and Example 1 is that, based on the mass of the hydrogel particles, the coating rate of the hydrogel coating liquid is 0.5%.

[0067] Effect of hydrogel particle coating rate on Comparative Example 4

[0068] The difference between this comparative example and Example 1 is that, based on the mass of the hydrogel particles, the coating rate of the hydrogel coating liquid is 8%.

[0069] Comparative Example 5

[0070] The water-lubricated fine denier polyester industrial yarn sewing thread prepared in Example 1 was used directly as sewing thread without being soaked in water.

[0071] The fine denier polyester industrial yarn sewing threads prepared in Comparative Examples 1-5 were immersed in water at 30℃ for 1 hour, and their performance was tested and used for sewing. The results are shown in Table 1.

[0072] Table 1

[0073]

[0074] Results analysis:

[0075] The sewing threads prepared in Examples 1-3 of this invention have a suitable moisture content and exhibit good sewing effect during sewing, with a significant improvement in sewing efficiency compared to the comparative example.

[0076] Comparative Example 1 is the original scheme. The baseline surface was not coated with hydrogel and was used directly as sewing thread. There was no lubrication effect during the sewing process, and the sewing speed was slow.

[0077] In Comparative Example 2, although hydrogel was applied, the hydrogel's saturation water absorption rate was low, resulting in no lubrication effect during suturing. In Comparative Example 3, the application rate of hydrogel particles was too low, leading to an insignificant lubrication effect. In Comparative Example 4, the application rate of hydrogel particles was too high, which not only wasted costs but also caused difficulties in suturing.

[0078] In Comparative Example 5, the sewing thread, without being pretreated by soaking in water, also failed to achieve a lubricating effect.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A sewing thread, characterized in that, It includes a baseline and a hydrogel coating, wherein the baseline is made of high-strength fine denier polyester industrial yarn twisted or woven, and the hydrogel coating is applied to the surface of the baseline.

2. The sewing thread according to claim 1, characterized in that, The hydrogel coating solution includes hydrogel particles, polyacrylate, and solvent, wherein the mass concentration of the hydrogel particles is 5-20% and the mass concentration of the polyacrylate is 10-30%. Preferably, the solvent is acetone or dichloroethane.

3. The sewing thread according to claim 2, characterized in that, The hydrogel particles are selected from at least one of homopolymer or copolymer hydrogels of acrylic acid and / or acrylamide.

4. The sewing thread according to claim 2 or 3, characterized in that, At 25°C, the saturated water absorption rate of the hydrogel particles to pure water is greater than 1000%.

5. The sewing thread according to any one of claims 2-4, characterized in that, The hydrogel particles are micron-sized particles; Preferably, the particle size of the hydrogel particles is 10 to 300 micrometers.

6. The sewing thread according to any one of claims 2-5, characterized in that, Based on the mass of the hydrogel particles, the coating rate of the hydrogel coating solution is 1-6%; Preferably, the coating rate is 2-3%.

7. The sewing thread according to any one of claims 1-6, characterized in that, The baseline is made of 20-300 dtex high-strength fine denier polyester industrial yarn through twisting or weaving; Preferably, the strength of the high-strength fine denier polyester industrial yarn is 5.0 to 8.5 cN / dtex.

8. The sewing thread according to any one of claims 1-7, characterized in that, The sewing thread has a linear density of 20–300 dtex and a breaking strength of 6–8 cN / dtex.

9. A method for preparing sewing thread as described in any one of claims 1-8, characterized in that, include: (1) Preparation of baseline and hydrogel coating solutions; (2) Apply the hydrogel coating solution to the baseline surface and dry to obtain the sewing thread; Preferably, the hydrogel coating liquid is applied to the baseline surface using a spraying or pressure dipping method.

10. A method of using sewing thread as described in any one of claims 1-8, characterized in that, Before use, soak the sewing thread in water for 20-60 minutes at a temperature of 10-30℃.

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