Coated yarn and preparation method and application thereof

Abstract

The invention provides a coated yarn and a preparation method and application thereof.The coated yarn comprises a yarn base body, a polyurea bottom layer and a hybrid polyurea layer, at least part of the polyurea bottom layer is located in the yarn base body, the hybrid polyurea layer is located on the outermost side of the polyurea bottom layer, and the hybrid polyurea layer contains inorganic filler. The coated yarn provided by the invention has excellent wear resistance, chemical resistance and mechanical properties, and the coating has excellent binding force with the yarn and is not easy to fall off.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of surface treatment of yarn materials, and particularly relates to a coated yarn as well as a preparation method and application thereof. BACKGROUND

[0002] Yarns are widely used in the fields of clothing, home textiles, industrial fabrics, etc. as basic materials in the textile industry. However, the wear resistance of traditional yarns is often insufficient, and problems such as fuzzing and breaking are prone to occur, especially in high-friction or dynamic load environments, which seriously affects the processing, service life and performance of fabrics. To improve this defect, the existing technology usually adopts coating technology to treat the surface of yarns, and forms a protective film on the surface of yarns to enhance the wear resistance, anti-fuzzing and pilling resistance, and chemical resistance.

[0003] At present, common yarn coating materials on the market include polyurethane (PU), acrylate, silicone and polytetrafluoroethylene (PTFE), etc. These coatings can improve the wear resistance and water resistance of yarns to some extent, but their wear resistance is still insufficient, and they also have the problem of easy aging and peeling off.

[0004] Moreover, the existing process for preparing coatings is relatively complex, often requiring high-temperature curing or multiple coating, which can ensure the wear resistance of the coating, but may have a negative impact on other properties such as air permeability, hand feeling and physical properties.

[0005] Therefore, it is still a key problem to be solved in the current textile industry to develop a yarn coating technology with high wear resistance and aging resistance. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application aims to provide a coated yarn as well as a preparation method and application thereof.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] On the one hand, the present application provides a coated yarn, which comprises a yarn substrate, a polyurea bottom layer and a hybrid polyurea layer, wherein the polyurea bottom layer is at least partially located inside the yarn substrate, the hybrid polyurea layer is located at the outermost side of the polyurea bottom layer, and the hybrid polyurea layer contains inorganic fillers.

[0009] The polyurea bottom layer is at least partially located inside the yarn matrix, and is at least partially located between the yarn fibers or inside the fibers, thereby forming excellent bonding with the yarn. In addition, the hybrid polyurea layer is introduced on the outside of the polyurea bottom layer, so that the coated yarn has excellent wear resistance and chemical resistance. Moreover, since the polyurea bottom layer and the hybrid polyurea layer are both polyurea structures, they have excellent compatibility, thereby avoiding aging and falling off of the hybrid polyurea layer from the surface of the yarn. In addition, the introduction of the inorganic filler can further increase the wear resistance and mechanical properties of the coated yarn, so that the coated yarn has excellent wear resistance, chemical resistance and mechanical properties, and the bonding between the coating and the yarn is excellent and not easy to fall off.

[0010] Preferably, the mass percentage content of the polyurea bottom layer is 2-7%, for example 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, etc., based on the total mass of the coated yarn being 100%.

[0011] Preferably, the mass percentage content of the hybrid polyurea layer is 4-10%, for example 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., based on the total mass of the coated yarn being 100%.

[0012] In the present application, if the mass percentage content of the hybrid polyurea layer and / or the polyurea bottom layer is too high, the coating is likely to fall off. If the mass percentage content of the hybrid polyurea layer and / or the polyurea bottom layer is too low, the wear resistance and chemical resistance of the coated yarn are likely to be low.

[0013] Preferably, the mass percentage content of the inorganic filler is 9-15%, for example 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc., based on the mass of the hybrid polyurea layer being 100%.

[0014] In the present application, if the amount of the inorganic filler is too low, the wear resistance and chemical resistance of the coated yarn are reduced. If the amount of the inorganic filler is too high, the hybrid polyurea layer in the coated yarn is likely to fall off during use.

[0015] Preferably, the inorganic filler includes any one or a combination of at least two of nano-silicon dioxide, nano-boehmite, nano-silicon carbide and nano-alumina.

[0016] Preferably, the particle size D50 of the inorganic filler is 500-800 nm, and the D90 is preferably 1-5 μm.

[0017] In a second aspect, the present application provides a preparation method of the coated yarn according to the first aspect, and the preparation method comprises:

[0018] (1) coating the raw yarn with a polyurea prepolymer solution and curing to form a yarn with a polyurea undercoat;

[0019] (2) coating the yarn with the polyurea undercoat with a hybrid polyurea solution and curing to obtain the coated yarn;

[0020] The hybrid polyurea solution contains inorganic fillers.

[0021] Compared with the current introduction of polyurethane or polyacrylate coating on the surface of the yarn to increase the wear resistance of the yarn, the present application introduces a hybrid polyurea solution containing inorganic fillers to form an organic-inorganic hybrid polyurea coating on the outermost side of the yarn coating, which not only gives the coated yarn an excellent dense wear-resistant layer, but also has excellent bonding strength between the organic-inorganic hybrid polyurea coating and the yarn, excellent wear resistance and is not easy to fall off; Furthermore, since the urethane groups (-NHCOO-) on the polyurea molecular chain have extremely high reactivity and can form hydrogen bonds with water molecules, a dense waterproof layer is formed on the surface of the material, therefore, the coated yarn prepared by the preparation method of the present application not only retains better flexibility, but also has excellent waterproofness, and the formation of the waterproof layer can also reduce the friction coefficient.

[0022] Specifically, the present application uses a gradient coating method, first coating a polyurea prepolymer solution which can penetrate the yarn fibers and complete curing to form a polyurea undercoat, and then introducing a hybrid polyurea solution containing inorganic nano-fillers to complete coating and curing, this coating method not only can ensure the bonding strength of the organic-inorganic hybrid polyurea coating and the yarn, but also can ensure the flexibility of the yarn.

[0023] Preferably, the viscosity of the hybrid polyurea solution is 1500-2000 cP, for example, 1500 cP, 1550 cP, 1600 cP, 1650 cP, 1700 cP, 1750 cP, 1800 cP, 1850 cP, 1900 cP, 1950 cP, 2000 cP, etc.

[0024] If the inorganic filler content of the hybrid polyurea solution is too low, the viscosity of the hybrid polyurea solution is too low, and the mass percentage content of the hybrid polyurea layer formed is too low, which will result in reduced wear resistance and chemical resistance of the coated yarn; if the amount of inorganic fillers added is too high, the viscosity of the hybrid polyurea solution is too high, and the mass percentage content of the hybrid polyurea layer formed is too high, which may result in easy peeling of the hybrid polyurea layer in the coated yarn.

[0025] In the present application, the viscosity is tested by a rotary viscometer method, Brookfield LV rotor, 25℃.

[0026] Preferably, the hybrid polyurea solution further contains diisocyanate and a compound with at least two amino groups.

[0027] The present application can form a compact wear-resistant layer with excellent wear resistance by the reaction of isocyanate component and amino compound to generate crosslinking network, and the introduction of nano inorganic filler in the crosslinking network.

[0028] Preferably, the content of the diisocyanate is 35-40%, such as 35%, 36%, 37%, 38%, 39%, 40%, etc., the content of the compound with at least two amino groups is 50-60%, such as 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, etc., and the content of the inorganic filler is 9-15%, such as 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc., based on the total mass of the hybrid polyurea solution.

[0029] Preferably, the diisocyanate includes any one or a combination of 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, hexamethylene diisocyanate (HDI) or diphenylmethane diisocyanate, preferably isophorone diisocyanate (IPDI).

[0030] Preferably, the compound with at least two amino groups includes any one or a combination of isophorone diamine, diacetone m-phenylenediamine, N,N-dialkylmethyl diamine, diethyltoluene diamine, diacetone ethylenediamine or polyaspartic acid, preferably polyaspartic acid (PASP).

[0031] Preferably, the inorganic filler includes any one or a combination of nano-silicon dioxide, nano-boehmite, nano-silicon carbide, nano-alumina.

[0032] Preferably, the particle size D50 of the inorganic filler is 500-800 nm, such as 500 nm, 550 nm, 600 nm, 650 nm, 700 nm, 750 nm, 800 nm, etc., and preferably D90 is 1-5 μm, such as 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, etc.

[0033] In the present application, when preparing the hybrid polyurea solution, the inorganic filler can be pre-dispersed by high-speed shearing emulsification, preferably the rotation speed of the high-speed shearing is 3000 rpm, and preferably the time of the high-speed shearing is 30 min.

[0034] Preferably, the method of curing in step (2) includes heating curing and / or ultraviolet curing.

[0035] The present application can select a UV-thermal dual-curing system for the curing of the hybrid polyurea solution, and the curing can be completed at a lower temperature (60-80℃) and in a shorter time, thereby avoiding damage to the yarn fibers caused by high temperature.

[0036] In the present application, the UV curing and the heat curing can be performed simultaneously or separately.

[0037] Preferably, the heat curing is performed at a temperature of 60-80℃, such as 60℃, 62℃, 65℃, 68℃, 70℃, 72℃, 75℃, 78℃, 80℃, etc., and for a time of 5-10 min, such as 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, etc.

[0038] Preferably, the UV curing is performed at a wavelength of 350-380 nm, such as 350 nm, 355 nm, 360 nm, 365 nm, 370 nm, 375 nm, 380 nm, etc., and at an intensity of 5-20 mW / cm 2 , such as 5 mW / cm 2 , 6 mW / cm 2 , 8 mW / cm 2 , 10 mW / cm 2 , 12 mW / cm 2 , 15 mW / cm 2 , 18 mW / cm 2 , 20 mW / cm 2 , etc., and for a time of 5-10 min, such as 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, etc.

[0039] Preferably, the coating method of step (2) comprises spraying or dipping, preferably electrostatic spraying.

[0040] Preferably, the coating amount of the hybrid polyurea solution is such that the coating layer after curing accounts for 4-10% of the mass of the coating yarn, such as 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc.

[0041] Preferably, the viscosity of the polyurea prepolymer solution is 300-500 cP, such as 300 cP, 320 cP, 350 cP, 380 cP, 400 cP, 420 cP, 450 cP, 480 cP, 500 cP, etc.

[0042] In the present application, the viscosity of the polyurea prepolymer solution is low, which can better penetrate into the yarn and play its corresponding role. If the viscosity of the polyurea prepolymer solution is too low, the mass percentage of the polyurea bottom layer formed will be low, and the bonding force with the yarn matrix cannot be formed; if the viscosity of the polyurea prepolymer solution is too high, it cannot better penetrate into the yarn, and the bonding force with the yarn matrix cannot be formed, which is easy to cause the coating of the coated yarn to fall off.

[0043] In the present application, the solid content of the polyurea prepolymer solution is 40-45%, for example, 40%, 41%, 42%, 43%, 44%, 45%, etc., preferably the polyurea prepolymer solution contains a solvent, and the solvent is preferably ethyl acetate; further preferably, the thixotropic index (TI value) of the polyurea prepolymer solution is 1.2-1.5, for example, 1.2, 1.3, 1.4, 1.5, etc.

[0044] Preferably, the polyurea prepolymer solution contains an isocyanate compound and an amino compound.

[0045] Preferably, the addition amount of the amino compound is 60-70% of the total mass of the isocyanate compound, for example, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, etc.

[0046] Preferably, the isocyanate compound includes any one or a combination of 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, xylylene diisocyanate, tetramethylxylylene diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, a trimer of isophorone diisocyanate, or a trimer of hexamethylene diisocyanate, further preferably a combination of the trimer of isophorone diisocyanate and the trimer of hexamethylene diisocyanate, and more preferably, based on 100% of the total mass of the trimer of isophorone diisocyanate and the trimer of hexamethylene diisocyanate, the content of the trimer of isophorone diisocyanate is 35-50%, for example, 35%, 38%, 40%, 42%, 45%, 48%, 50%, etc., and the content of the trimer of hexamethylene diisocyanate is 50-65%, for example, 50%, 52%, 55%, 58%, 60%, 62%, 65%, etc.

[0047] The present application simultaneously introduces HDI trimer and IPDI trimer, which has low viscosity, reduces the use of solvents, enhances the surface hardness, improves the wear resistance, and has the advantages of fast drying, etc.

[0048] Preferably, the amino compound comprises any one or a combination of isophorone diamine, diacetyl m-phenylenediamine, N,N-dialkyl methyl diamine, diethyl toluene diamine or diacetyl ethylenediamine.

[0049] Preferably, the method of curing in step (1) comprises stage temperature rising curing.

[0050] The stage temperature rising curing is a curing method in a way of stage temperature rising, which can ensure the stability of the coating performance after curing.

[0051] Preferably, the method of stage temperature rising curing is curing at a temperature rising rate of 2-5℃ / min (for example, 2℃ / min, 2.5℃ / min, 3℃ / min, 3.5℃ / min, 4℃ / min, 4.5℃ / min, 5℃ / min, etc.) from 60℃ to 80℃.

[0052] Preferably, the method of coating in step (1) comprises dipping.

[0053] Preferably, the dipping distance is 50-100 cm, for example, 50 cm, 60 cm, 70 cm, 80 cm, 90 cm, 100 cm, etc., and preferably the linear speed of the raw yarn is 5-8 m / min, for example, 5 m / min, 5.5 m / min, 6 m / min, 6.5 m / min, 7 m / min, 7.5 m / min, 8 m / min, etc.

[0054] In the dipping distance of 50-100 cm, the dipping time can be ensured while cooperating with the winding speed, and the space occupied is not too much, so as to avoid increasing the loss of coating material.

[0055] Preferably, the dipping amount of the polyurea prepolymer solution is 2-7% of the mass of the coating yarn, for example, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, etc.

[0056] The present application adopts a step-by-step coating process, first dipping the yarn with a polyurea prepolymer solution with low viscosity, which can penetrate into the yarn, and then introducing a hybrid polyurea solution with high viscosity for coating. The gradient coating method can ensure the combination ability of the organic-inorganic hybrid polyurea coating and the yarn, and also ensure that the yarn still has good flexibility.

[0057] Preferably, the preparation method further comprises oil removal and / or activation.

[0058] Preferably, the oil removal is to remove various types of oil residues in the yarn by physical or chemical methods, so as to facilitate the subsequent coating process.

[0059] Preferably, the oil removal method comprises impregnating the yarn raw material with an oil removal solution.

[0060] Preferably, the activation is to change the physical state or chemical composition of the yarn surface by physical and / or chemical methods, so as to facilitate the subsequent coating process of the yarn, and preferably the activation method comprises plasma activation treatment.

[0061] In the present application, the preparation method comprises:

[0062] (1) Yarn pretreatment: impregnating the raw yarn in an oil removal solution for impregnation oil removal treatment to remove impurities, and / or using plasma activation to increase the roughness of the raw yarn surface by plasma treatment;

[0063] (2) Base layer coating: impregnating the yarn with a polyurea prepolymer solution with a viscosity of 300-500 cP and performing infrared gradient curing;

[0064] (3) Top layer coating: spraying the yarn with a hybrid polyurea solution containing inorganic fillers with a viscosity of 1500-2000 cP and performing heat curing and / or ultraviolet curing to obtain the coated yarn.

[0065] In a third aspect, the present application provides a coated yarn as described in the first aspect for use in the preparation of clothing, home textiles, and industrial fabrics.

[0066] Compared with the prior art, the present application has the following beneficial effects:

[0067] (1) The coated yarn provided by the present application has excellent wear resistance, chemical resistance, and mechanical properties, and the bonding force between the coating and the yarn is excellent and not easy to fall off.

[0068] (2) The preparation method provided by the present application can form excellent bonding capacity between the coating and the yarn, and the mechanical properties are greatly improved. DETAILED DESCRIPTION

[0069] The technical solutions of the present application will be further described in the specific embodiments. Those skilled in the art should understand that the embodiments are only to help understand the present application and should not be regarded as specific limitations of the present application.

[0070] Unless otherwise specified, the raw materials involved in the following specific embodiments of the present application are all conventional materials in the art and can be purchased through commercially available products. Some raw material information is as follows:

[0071] Polyaspartic acid: purchased from Shenzhen Feiyangjunyan New Material Co., Ltd.

[0072] KH-550 modified nano-silica (D50 = 800 nm, D90 = 1.2 μm): purchased from Hangzhou Jibang New Material.

[0073] Example 1

[0074] The present example provides a method for preparing a coated yarn and a coated yarn obtained therefrom, the method being as follows:

[0075] (1) Activation:

[0076] Select 300D polyester filament yarn, activate by plasma treatment (power 200 W, time 30 s);

[0077] (2) Polyurea primer:

[0078] Prepare a polyurea prepolymer solution: HDI trimer 50%, IPDI trimer 50%, isophorone diamine 65% (based on 100% of the total mass of HDI trimer and IPDI trimer), viscosity 400 cP, solid content 42%, solvent ethyl acetate, thixotropic index (TI value) 1.4;

[0079] Immerse the raw yarn in the polyurea prepolymer solution, with an immersion distance of 100 cm and a linear speed of 5 m / min; solidify at a temperature increasing rate of 2°C / min from 60°C to 80°C, and the polyurea primer formed after solidification accounts for 5% of the total mass of the coated yarn;

[0080] (3) Polyurea topcoat:

[0081] Prepare a hybrid polyurea solution by ultrasonic dispersion: 36 wt% isophorone diisocyanate, 54 wt% polyaspartic acid, 10 wt% KH-550 modified nano-silica, viscosity 1800 cP, wherein the D50 of the KH-550 modified nano-silica is 800 nm and the D90 is 1.2 μm;

[0082] Spray the hybrid polyurea solution onto the surface of the yarn using an electrostatic spraying device (voltage 50 kV, flow rate 0.8 L / min) and solidify, with ultraviolet curing (wavelength 365 nm, intensity 10 mW / cm²) and hot air curing (60°C) being carried out simultaneously, the solidification time being 5 min, to obtain the coated yarn, wherein the spraying amount of the hybrid polyurea solution is such that the content of the formed coating accounts for 6% of the mass of the coated yarn.

[0083] Example 2

[0084] The embodiment provides a preparation method of a coated yarn and the coated yarn obtained therefrom.

[0085] The difference from the embodiment 1 is that, in the embodiment, the coating method of step (3) is dipping, specifically, the hybrid polyurea solution is dipped to the surface of the yarn and solidified in a dipping manner, ultraviolet solidification (wavelength 365 nm, intensity 10 mW / cm2) and hot air solidification (60 DEG C) are simultaneously performed, the solidification time is 5 min, and the coated yarn is obtained, wherein the spraying amount of the hybrid polyurea solution is 6% of the mass of the coated yarn.

[0086] Embodiment 3

[0087] The embodiment provides a preparation method of a coated yarn and the coated yarn obtained therefrom, and the preparation method is as follows:

[0088] (1) activation:

[0089] The 150D polyester filament yarn is activated by plasma treatment (power 200 W, time 30 s);

[0090] (2) polyurea primer:

[0091] The polyurea prepolymer solution is prepared: HDI trimer 65%, IPDI trimer 35%, isophorone diamine 60% (based on the total mass of the HDI trimer and the IPDI trimer being 100%), the solid content is adjusted to have a viscosity of 300 cP, and the solvent is ethyl acetate;

[0092] The raw yarn is dipped in the polyurea prepolymer solution, the dipping distance is 100 cm, the linear speed is 10 m / min; the solidification is performed at a temperature increasing rate of 5 DEG C / min from 60 DEG C to 80 DEG C, and the polyurea primer formed after the solidification accounts for 2% of the total mass of the coated yarn;

[0093] (3) polyurea topcoat:

[0094] The hybrid polyurea solution is prepared by ultrasonic dispersion: 40 wt% hexamethylene diisocyanate, 51 wt% diacetyl ethylenediamine, and 9 wt% KH-550 modified nano-silicon dioxide, and the viscosity is 1700 cP;

[0095] The hybrid polyurea solution is sprayed to the surface of the yarn and solidified by using an electrostatic spraying device (voltage 50 kV, flow rate 0.8 L / min), ultraviolet solidification (wavelength 365 nm, intensity 10 mW / cm2) and hot air solidification (60 DEG C) are simultaneously performed, the solidification time is 5 min, and the coated yarn is obtained, wherein the spraying amount of the hybrid polyurea solution is 4% of the mass of the coated yarn.

[0096] Example 4

[0097] The present example provides a method for preparing a coated yarn and a coated yarn obtained therefrom, the method for preparing a coated yarn is as follows:

[0098] (1) Activation:

[0099] Select 300D polyester filament yarn, activate by plasma treatment (power 200 W, time 30 s);

[0100] (2) Polyurea primer:

[0101] Prepare a polyurea prepolymer solution: HDI trimer 60%, IPDI trimer 40%, isophorone diamine 70% (based on the total mass of HDI trimer and IPDI trimer as 100%), adjust the solid content so that its viscosity is 500 cP, the solvent is ethyl acetate;

[0102] Immerse the raw yarn in the polyurea prepolymer solution, the immersion distance is 100 cm, the linear speed is 2 m / min; solidify at a temperature increasing rate of 4 ℃ / min from 60 ℃ to 80 ℃, the polyurea primer formed after solidification accounts for 7% of the total mass of the coated yarn;

[0103] (3) Polyurea topcoat:

[0104] Prepare a hybrid polyurea solution by ultrasonic dispersion: 35 wt% phenylenedimethylene diisocyanate, 50 wt% diethyl toluene diamine, 15 wt% KH-550 modified nano-silica, viscosity 2000 cP;

[0105] Spray the hybrid polyurea solution onto the surface of the yarn using an electrostatic spraying device (voltage 50 kV, flow rate 0.8 L / min) and solidify, simultaneously perform ultraviolet curing (wavelength 365 nm, intensity 10 mW / cm²) and hot air curing (60 ℃), the solidification time is 5 min, to obtain the coated yarn, wherein the spraying amount of the hybrid polyurea solution is such that the content of the formed coating accounts for 10% of the mass of the coated yarn.

[0106] Example 5

[0107] The present example provides a method for preparing a coated yarn and a coated yarn obtained therefrom.

[0108] The difference from Example 1 is that in the present example, the amount of inorganic filler added in step (3) is 20 wt% (the viscosity of the hybrid polyurea solution is 2200 cP).

[0109] Example 6

[0110] The present embodiment provides a method for preparing a coated yarn and a coated yarn obtained thereby.

[0111] The difference from Example 1 is that in the present embodiment, the amount of the inorganic filler added in step (3) is 5 wt% (the viscosity of the hybrid polyurea solution is 1400 cP).

[0112] Example 7

[0113] The present embodiment provides a method for preparing a coated yarn and a coated yarn obtained thereby.

[0114] The difference from Example 1 is that in the present embodiment, the viscosity of the polyurea prepolymer solution is adjusted to 200 cP by adjusting the content of the solvent in step (2).

[0115] Example 8

[0116] The present embodiment provides a method for preparing a coated yarn and a coated yarn obtained thereby.

[0117] The difference from Example 1 is that in the present embodiment, the viscosity of the polyurea prepolymer solution is adjusted to 600 cP by adjusting the content of the solvent in step (2).

[0118] Comparative Example 1

[0119] The present comparative example provides a 300D polyester filament yarn, which is the raw yarn before being treated in Example 1, and the yarn strength is 1304 cN.

[0120] Comparative Example 2

[0121] The present comparative example provides a method for preparing a coated yarn and a coated yarn obtained thereby.

[0122] The difference from Example 1 is that in the present comparative example, step (2) is not performed, and step (3) is performed directly.

[0123] Comparative Example 3

[0124] The present comparative example provides a method for preparing a coated yarn and a coated yarn obtained thereby.

[0125] The difference from Example 1 is that in the present comparative example, step (3) is not performed.

[0126] Comparative Example 4

[0127] The present comparative example provides a method for preparing a coated yarn and a coated yarn obtained thereby.

[0128] The difference from Example 1 is that in the present comparative example, no inorganic filler is added in step (3).

[0129] Comparative Example 5

[0130] This comparative example provides a method for preparing a coated yarn and a coated yarn obtained therefrom, the method is as follows:

[0131] (1) Activation:

[0132] Select 300D polyester filament yarn, activate by plasma treatment (power 200 W, time 30 s);

[0133] (2) Forming a coating

[0134] Dip the raw yarn in a polyurethane resin solution (Shanghai Bierter water-based polyurethane resin emulsion, model PU7104), the dipping distance is 100 cm, the linear speed is 2 m / min, after dipping, solidify at a temperature rising rate of 4 ℃ / min, from 60 ℃ to 80 ℃, the polyurethane resin layer formed after solidification accounts for 11% of the total mass of the coated yarn.

[0135] Performance test

[0136] Test the performance of the samples of the examples and comparative examples, the method is as follows:

[0137] (1) Coating adhesion: test according to the test standard of ASTM D3359;

[0138] (2) Wear resistance: test according to the test standard of ISO 12947;

[0139] (3) Water contact angle: test according to the test standard of ISO 19403;

[0140] (4) Chemical resistance: test according to the test standard of GB / T 17632-1998 (acid resistance), GB / T 20102-2006 (alkali resistance) (strength loss);

[0141] (5) Strength: test according to the test standard of GB / T 14344-2022;

[0142] The test results are shown in Table 1:

[0143] Table 1

[0144]

[0145] Note: The tensile strength is a relative value, taking the tensile strength of the raw yarn as 100%.

[0146] The coating yarn provided by the application has excellent combination between the coating and the yarn, excellent wear resistance, no damage at 100000 rotations, no change in acid and alkali soaking, and still has excellent mechanical properties.

[0147] From the comparison of Example 1 and Examples 5-8, it can be known that when the addition amount of the inorganic filler, the viscosity of the hybrid polyurea solution and the viscosity of the polyurea prepolymer solution are within the limited range, the coating yarn has excellent wear resistance, excellent combination between the coating and the yarn, excellent chemical resistance and excellent mechanical properties.

[0148] From the comparison of Example 1 and Comparative Examples 2-4, it can be known that the steps of gradient coating are indispensable, and the inorganic filler needs to be introduced into the hybrid polyurea solution used in the polyurea surface layer, so as to give the coating yarn excellent wear resistance and excellent combination between the coating and the yarn.

[0149] From the comparison of the example and Comparative Example 5, it can be known that compared with the current introduction of polyurethane or polyacrylate coating on the surface of the yarn to increase the wear resistance of the yarn, the coating yarn provided by the application has excellent wear resistance, chemical resistance and mechanical properties, and excellent combination between the coating and the yarn, and is not easy to fall off.

[0150] The applicant declares that the technical solutions of the application are illustrated by the above examples, but the application is not limited to the above examples, that is, it does not mean that the application must rely on the above examples to be implemented. It should be understood by those skilled in the art that any improvement on the application, equivalent replacement of each raw material of the product of the application, addition of auxiliary ingredients, selection of specific modes and the like all fall within the protection scope and disclosure scope of the application.

Claims

1. A coated yarn, characterized in that, It includes a yarn matrix, a polyurea underlayer, and a hybrid polyurea layer, wherein the polyurea underlayer is at least partially located inside the yarn matrix, the hybrid polyurea layer is located on the outermost side of the polyurea underlayer, and the hybrid polyurea layer contains inorganic fillers.

2. The coated yarn according to claim 1, characterized in that, Based on the total mass of the coated yarn as 100%, the mass percentage of the polyurea substrate is 2-7%. And / or, based on the total mass of the coated yarn, the mass percentage of the hybrid polyurea layer is 4-10%.

3. The coated yarn according to claim 1 or 2, characterized in that, Based on the mass of the hybrid polyurea layer being 100%, the inorganic filler has a mass percentage content of 9-15%. Preferably, the inorganic filler includes any one or a combination of at least two of nano-silica, nano-boehmite, nano-silicon carbide, and nano-alumina; Preferably, the inorganic filler has a particle size D50 of 500-800 nm, and more preferably a D90 of 1-5 μm.

4. A method for preparing coated yarn as described in any one of claims 1-3, characterized in that, The preparation method includes: (1) The raw yarn is coated with a polyurea prepolymer solution and cured to form a yarn with a polyurea underlayer; (2) A yarn with a polyurea substrate is coated with a hybrid polyurea solution and cured to obtain the coated yarn; The hybrid polyurea solution includes inorganic fillers.

5. The preparation method according to claim 4, characterized in that, The viscosity of the hybrid polyurea solution is 1500-2000 cP; Preferably, the hybrid polyurea solution further contains a diisocyanate and a compound having at least two amino groups; Preferably, based on the total mass of the hybrid polyurea solution, the content of the diisocyanate is 35-40%, the content of the compound with at least two amino groups is 50-60%, and the content of the inorganic filler is 9-15%. Preferably, the diisocyanate includes any one or a combination of at least two of 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, phenyl dimethyl diisocyanate, tetramethylphenyl dimethyl diisocyanate, hexamethylene diisocyanate or diphenylmethane diisocyanate; Preferably, the compound having at least two amino groups includes any one or a combination of at least two of isophorone diamine, diacetyl-m-phenylenediamine, N,N-dialkylmethyldiamine, diethyltoluene diamine, diacetylethylenediamine, or polyaspartic acid; Preferably, the inorganic filler includes any one or a combination of at least two of nano-silica, nano-boehmite, nano-silicon carbide, and nano-alumina; Preferably, the inorganic filler has a particle size D50 of 500-800 nm, and more preferably a D90 of 1-5 μm.

6. The preparation method according to claim 4 or 5, characterized in that, The curing method described in step (2) includes heat curing and / or ultraviolet curing; Preferably, the heating and curing temperature is 60-80℃, and the time is 5-10 min; Preferably, the wavelength of the ultraviolet curing is 350-380 nm, and the intensity is 5-20 mW / cm. 2 The time is 5-10 minutes; Preferably, the coating method in step (2) includes spraying or dipping, preferably electrostatic spraying; Preferably, the coating amount of the hybrid polyurea solution is such that the cured coating accounts for 4-10% of the mass of the coated yarn.

7. The preparation method according to any one of claims 4-6, characterized in that, The viscosity of the polyurea prepolymer solution is 300-500 cP; Preferably, the polyurea prepolymer solution contains isocyanate compounds and amino compounds; Preferably, the amount of the amino compound added is 60-70% of the total mass of the isocyanate compounds; Preferably, the isocyanate compound comprises any one or a combination of at least two of the following: 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate, phenyl diisocyanate, tetramethylphenyl diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, a trimer of isophorone diisocyanate, or a trimer of hexamethylene diisocyanate. More preferably, it is a combination of a trimer of isophorone diisocyanate and a trimer of hexamethylene diisocyanate. Even more preferably, based on the total mass of the trimer of isophorone diisocyanate and the trimer of hexamethylene diisocyanate being 100%, the content of the trimer of isophorone diisocyanate is 35-50%, and the content of the trimer of hexamethylene diisocyanate is 50-65%. Preferably, the amino compound includes any one or a combination of at least two of isophorone diamine, diacetyl-m-phenylenediamine, N,N-dialkylmethyldiamine, diethyltoluene diamine, or diacetylethylenediamine.

8. The preparation method according to any one of claims 4-7, characterized in that, The curing method described in step (1) includes staged temperature rise curing; Preferably, the staged heating and curing method is to heat from 60°C to 80°C at a heating rate of 2-5°C / min for curing; Preferably, the coating method in step (1) includes impregnation; Preferably, the impregnation amount of the polyurea prepolymer solution is such that the polyurea underlayer accounts for 2-7% of the mass of the coated yarn.

9. The preparation method according to any one of claims 4-8, characterized in that, The preparation method further includes degreasing and / or activation; Preferably, the activation treatment method includes plasma activation treatment.

10. The application of a coated yarn as described in any one of claims 1-3 in the preparation of clothing, home textiles, and industrial fabrics.

Images