Friction-resistant coating of textile fabric and preparation method of friction-resistant coating

Abstract

The invention belongs to the technical field of textiles, and discloses a friction-resistant coating of a textile fabric and a preparation method, the friction-resistant coating comprises the following components by weight: 100 parts of waterborne polyurethane resin; 5 to 25 parts of surface modified inorganic nano particles; 3-15 parts of organic polymer wear-resistant microspheres; 1-10 parts of a cross-linking agent; 0.5 to 5 parts of a lubricant; 0.5-5 parts of an auxiliary agent; a proper amount of water. The method has the beneficial effects that on the basis of water-based environmental protection, the dry / wet friction resistance, the durability, the flexibility and the adhesive force to fabrics of the coating can be ingeniously balanced and remarkably improved, and the method is simple and convenient in process and suitable for industrial application.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a friction-resistant coating for textiles and its preparation method. Background Technology

[0002] With the development of the textile industry, single-function textiles can no longer meet the demands of the high-end market. For workwear, outdoor sportswear, furniture upholstery, bag fabrics, and specialty industrial fabrics (such as filter materials), abrasion resistance is one of the key quality indicators. Excellent abrasion resistance can effectively extend the service life of textiles and maintain their appearance and functionality.

[0003] Currently, the mainstream technology for improving the abrasion resistance of textiles is the application of functional coatings. Existing coating technologies mainly revolve around the following categories: Traditional solvent-based coating technology: This type of technology uses solvent-based polyurethane (PU), polyvinyl chloride (PVC), or polyacrylate (PA) as coating agents. A continuous film is formed on the fabric surface after coating, solidification, or drying. Waterborne coating technology: To meet environmental protection requirements, waterborne polyurethane (WPU), waterborne acrylic (PA), and their copolymers have become the mainstream development.

[0004] Current textile abrasion-resistant coating technologies face the following prominent contradictions and challenges: achieving both high abrasion resistance and excellent hand feel / flexibility is difficult; a gap exists between environmentally friendly water-based systems and high performance (especially wet abrasion resistance and washability); and the need to simultaneously improve the strong and lasting adhesion between the coating and the base fabric, as well as the coating's own cohesive strength and durability. In general, traditional coatings (such as PVC and ordinary PU) have a hard feel, are not breathable, and are prone to cracking and peeling after repeated friction. Some water-based coatings are environmentally friendly but lack sufficient abrasion resistance, exhibiting poor dry and wet rubbing fastness. Adding ordinary abrasion-resistant fillers (such as silica) can improve abrasion resistance, but often leads to a worse coating feel, uneven gloss, or decreased adhesion to the base fabric. Existing technologies struggle to balance multiple properties such as high abrasion resistance, flexibility, adhesion fastness, and environmental friendliness.

[0005] Therefore, the industry urgently needs to develop a new coating system and its preparation method. It should be able to cleverly balance and significantly improve the coating's dry / wet friction resistance, durability, flexibility, and adhesion to fabrics while being water-based and environmentally friendly. Moreover, the process should be simple and suitable for industrial application. Summary of the Invention

[0006] This invention discloses a friction-resistant coating for textiles and its preparation method, relating to a friction-resistant coating for textiles, especially for high-intensity applications such as workwear, outdoor sportswear, and furniture upholstery, and its preparation method, which can effectively solve the technical problems involved in the background art.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A friction-resistant coating for textiles comprises an aqueous polyurethane resin, surface-modified inorganic nanoparticles, organic polymer abrasion-resistant microspheres, a crosslinking agent, a lubricant, an additive, and water. The primary objective of this invention is to overcome the shortcomings of existing textile coatings, such as insufficient abrasion resistance, poor durability, and difficulty in simultaneously achieving a good hand feel and abrasion resistance, and to provide a textile coating with strong adhesion, a soft hand feel, excellent resistance to dry and wet friction, and superior washability.

[0009] As a preferred improvement of the present invention: by weight, it comprises 100 parts of waterborne polyurethane resin, 5-25 parts of surface-modified inorganic nanoparticles, 3-15 parts of organic polymer wear-resistant microspheres, 1-10 parts of crosslinking agent, 0.5-5 parts of lubricant and 0.5-5 parts of additives.

[0010] As a preferred improvement of the present invention: the surface-modified inorganic nanoparticles are silane coupling agent-modified nano-silica; the organic polymer wear-resistant microspheres are polyurea-formaldehyde resin microcapsules; the crosslinking agent is a carbodiimide crosslinking agent; the lubricant is a polyethylene wax emulsion; and the additive is a polyether-modified organosiloxane.

[0011] A method for preparing a friction-resistant coating on textiles includes two steps: solution preparation and solution spraying.

[0012] S1, Solution preparation;

[0013] S11. Surface-modified inorganic nanoparticles, part of waterborne polyurethane resin, appropriate amount of additives and water are mixed and processed with a high-speed disperser to obtain a pre-dispersed slurry.

[0014] S12: Mix the pre-dispersed slurry with the remaining aqueous polyurethane resin, organic polymer wear-resistant microspheres, lubricant, and additives to obtain the main agent;

[0015] S13: Before use, add crosslinking agent to the main agent, stir at low speed, and then let it stand to mature to obtain the spraying solution;

[0016] S2. Solution spraying: The spraying solution obtained in step S13 is sprayed onto the surface of the textile.

[0017] As a preferred improvement of the present invention: the surface-modified inorganic nanoparticles are silane coupling agent-modified nano-silica; the organic polymer wear-resistant microspheres are polyurea-formaldehyde resin microcapsules; the crosslinking agent is a carbodiimide crosslinking agent; the lubricant is a polyethylene wax emulsion; and the additive is a polyether-modified organosiloxane.

[0018] As a preferred improvement of the present invention, step S2 includes the following steps:

[0019] S21, Vacuuming;

[0020] S22, Plasma cleaning and activation;

[0021] S23, Vacuum spraying;

[0022] S24, ionization curing and heat curing.

[0023] As a preferred improvement of the present invention: step S21 specifically involves placing the textile into a plasma cleaning chamber and evacuating it to a vacuum of 0.8 Pa.

[0024] As a preferred improvement of the present invention: step S22 specifically involves, after the vacuum level is reached, introducing 100 sccm of argon / oxygen gas, and after the vacuum stabilizes, turning on the plasma instrument for cleaning.

[0025] As a preferred improvement of the present invention: Step S23 specifically involves, after cleaning, placing the textile into a movable spraying chamber, spraying the spraying solution obtained in step S13, setting the spraying flow rate to 20 ml / min, the nozzle moving speed within the chamber to 60 mm / s, and the spraying time to 80 s.

[0026] As a preferred improvement of the present invention: Step S24 specifically involves placing the textile into a heat curing chamber after the spraying is completed. The chamber temperature is set to 80 degrees Celsius. After the temperature is reached, argon gas is introduced at 300 sccm. After the vacuum stabilizes, plasma curing is performed. After curing is completed, heating is stopped, the vacuum is broken for 1 second, and then the gas is evacuated to 6 Pa. This process is repeated to quickly cool down to 40 degrees Celsius and completely break the vacuum. The product is then manufactured.

[0027] The beneficial effects of this invention are as follows:

[0028] It exhibits excellent abrasion resistance; due to the synergistic effect of the organic / inorganic composite abrasion-resistant system, the Martindale coating can withstand over 30,000 abrasion cycles without damage (compared to <8,000 cycles for the control sample); it has strong adhesion, with a special crosslinking agent forming a chemical bond with the base resin, achieving a grade 5 in the crosslink test and demonstrating good peel resistance; it strikes a balance between feel and durability, with the use of organic abrasion-resistant particles and lubricants improving abrasion resistance while maintaining the soft touch of the fabric; it has excellent environmental resistance, with the crosslinked network structure giving the coating superior resistance to washing, perspiration, and aging; it is environmentally friendly and efficient, using water as a medium and having low VOC content; and its simple preparation process makes it suitable for continuous production. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0030] Figure 1 This is a schematic diagram of the abrasion-resistant coating spraying process for a textile according to the present invention;

[0031] Figure 2 This is a comparison diagram between the product of this invention and existing technologies. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0037] A wear-resistant coating for textiles, by weight, comprises the following components: 100 parts of waterborne polyurethane resin; 5-25 parts of surface-modified inorganic nanoparticles; 3-15 parts of organic polymer wear-resistant microspheres; 1-10 parts of crosslinking agent; 0.5-5 parts of lubricant; 0.5-5 parts of auxiliaries; and an appropriate amount of water. The inorganic nanoparticles are silane coupling agent-modified nano-silica; the organic polymer wear-resistant microspheres are polyurea-formaldehyde resin microcapsules; the crosslinking agent is a carbodiimide crosslinking agent; the lubricant is a polyethylene wax emulsion; and the auxiliaries are polyether-modified organosiloxanes.

[0038] A method for preparing the above-mentioned wear-resistant coating includes the following steps: S11: Pre-dispersing inorganic nanoparticles and a portion of aqueous resin using a high-speed disperser at 1000 rpm for 1 min; S12: Mixing the pre-dispersed slurry with the remaining resin, organic polymer wear-resistant microspheres, lubricant, and additives; S13: Adding a crosslinking agent before use and allowing it to stand for 30 min to mature (maturation: the smaller crystals or sol particles in the solute dissolve and redeposit onto the larger crystals or sol particles).

[0039] The process of applying a solution to a product to create a film includes a process flow of vacuuming, plasma cleaning and activation, vacuum spraying, and plasma bombardment curing / heat curing. The vacuum conditions are 10~0.1 Pa; the plasma cleaning generator is an AE CESAR 1310E RF power supply with a cleaning power of 100W~1000W, and the auxiliary gas is argon / oxygen with a gas flow rate of 50~500 sccm; the vacuum spraying flow rate is 1~200 ml / min, and the nozzle horizontal movement speed is 0~200 mm / s; the plasma bombardment curing generator is a TruPlasma DC 3020 bipolar pulse power supply with a power of 500W~5000W, the auxiliary gas is argon with a gas flow rate of 50~1000 sccm, and the curing heating temperature is 40~150 degrees Celsius.

[0040] Example 1

[0041] A method for preparing a friction-resistant coating, wherein the friction-resistant coating comprises the following components in parts by weight:

[0042] Aqueous resin matrix (aqueous acrylic emulsion): 100 parts;

[0043] Composite wear-resistant reinforcing agent (composed of inorganic nano-hard particles (silane coupling agent modified nano-silica) and organic polymer elastic microspheres (polyurea-formaldehyde resin microcapsules) in a weight ratio of 1:0.5 to 1:2): 8-40 parts;

[0044] Crosslinking agent (carbodiimide): 1-10 parts;

[0045] Lubricant (polyethylene wax emulsion): 0.5-5 parts;

[0046] Additive (polyether-modified organosiloxane): 0.5-5 parts;

[0047] Deionized water: appropriate amount, used to adjust the solid content of the system to 20%-45%.

[0048] Step S11: Preparation of pre-dispersed slurry

[0049] At room temperature (20-30℃), add all the inorganic nano-hard particles, about 1 / 3 of the water-based resin matrix, and appropriate amounts of additives and deionized water to a high-speed disperser. Disperse at 800-1500 rpm for 15-30 minutes until a uniform, stable slurry without visible particles is formed.

[0050] Step S12: Mixing of main agents

[0051] Add the remaining aqueous resin matrix to a low-speed stirring tank. While stirring at 300-500 rpm, add the following in sequence: the pre-dispersed slurry prepared in step S11; the formulated amount of organic polymer elastic microspheres; the formulated amount of lubricant; and the formulated amount of remaining additives. After the addition is complete, maintain this stirring speed and continue stirring for 20-40 minutes to ensure all components are evenly mixed, resulting in a homogeneous and stable main agent.

[0052] Step S13: Online cross-linking and curing

[0053] Before use, slowly add the formulated amount of crosslinking agent to the main agent obtained in step S12. Stir at a low speed of 200-400 rpm for 10-20 minutes to avoid introducing too many air bubbles or causing premature local reaction of the crosslinking agent due to high-speed stirring. After stirring, let the coating adhesive stand and cure for 30-90 minutes.

[0054] Solution spraying application process

[0055] 1. Material feeding and vacuuming. The continuous vacuum spraying equipment (3 interconnected vacuum chambers, with valves that can be opened and closed at the connection between the chambers, and motor pulleys in the chambers for material transfer) is ready for use. After the equipment is ready, the raw material is placed on the carrier tray, and the carrier tray enters chamber 1 (plasma cleaning chamber). Vacuuming is performed to a range of 0.1~10Pa.

[0056] 2. Plasma cleaning. After the vacuum level is reached, argon / oxygen gas is introduced at 50~500 sccm. After the vacuum stabilizes, the RF power supply AE CESAR 1310E is turned on and the power is set to 200~1000W. The cleaning and activation time is about 60 seconds.

[0057] 3. Solution spraying. After cleaning, the carrier tray enters chamber 2 (movable spraying chamber). The spraying flow rate is set to 10~100ml / min, the nozzle moving speed in the chamber is 0~200mm / s (0 is taken as fixed point spraying), and the spraying time is about 80s.

[0058] 4. Film curing. After spraying, the carrier disk enters cavity 3 (thermal curing cavity). The cavity temperature is set to about 80 degrees Celsius. After the temperature is reached, argon gas is introduced at 50~1000 sccm. After the vacuum is stabilized, plasma curing is performed using a bipolar pulse power supply TruPlasma DC3020. The power supply is set to 500~5000W, and the curing time is about 60 seconds.

[0059] 5. Cooling and unloading. After curing, stop heating, break the vacuum for 1-2 seconds, then evacuate to 3-10 Pa. Repeat this process to quickly cool down to about 40 degrees Celsius, then completely break the vacuum, unload the tray, and the product is finished.

[0060] Example 2

[0061] Preparation of 100ml solution: At room temperature (20-30℃), add 10g of inorganic nano-hard particles, 10ml of aqueous resin matrix, 1ml of additives, and 50ml of deionized water to a high-speed disperser. Disperse at 1000 rpm for 20 minutes until a uniform, stable slurry without visible particles is formed.

[0062] Add the remaining 30ml of water-based resin matrix to a low-speed stirring tank. While stirring at 300 rpm, add the following in sequence: the pre-dispersed slurry prepared in the previous step; 20g of organic polymer elastic microspheres; 3ml of lubricant; and 3ml of other additives. Continue stirring at this speed for 2 minutes to ensure all components are mixed evenly, resulting in a homogeneous and stable main agent.

[0063] Slowly add 5 ml of crosslinking agent to the main agent, stir at a low speed of 20 rpm for 10 minutes, and let stand for 30 minutes.

[0064] Spraying process:

[0065] After the equipment is ready for standby, place the raw materials into the carrier tray, and the carrier tray enters chamber 1 (plasma cleaning chamber), and evacuate to 0.8 Pa.

[0066] Once the vacuum level is reached, 100 sccm of argon / oxygen gas is introduced. After the vacuum stabilizes, the RF power supply AE CESAR1310E is turned on with a power setting of 500W and a cleaning time of 60s.

[0067] After cleaning, the carrier tray enters cavity 2 (movable spraying cavity), the spraying flow rate is set to 20ml / min, the nozzle moving speed in the cavity is 60mm / s (0 is taken as fixed point spraying), and the spraying time is 80s.

[0068] After the coating is completed, the carrier disk enters cavity 3 (thermal curing cavity). The cavity temperature is set to 80 degrees. After the temperature is reached, argon gas is introduced at 300 sccm. After the vacuum is stabilized, plasma curing is performed using a bipolar pulse power supply TruPlasma DC 3020 with a power of 3000W and a curing time of 60s.

[0069] After curing, stop heating, break the vacuum for 1 second, then evacuate to 6 Pa. Repeat this process to quickly cool down to 40 degrees Celsius, then completely break the vacuum, discharge the material from the tray, and the product is finished.

[0070] It exhibits excellent abrasion resistance; due to the synergistic effect of the organic / inorganic composite abrasion-resistant system, the Martindale coating can withstand over 30,000 abrasion cycles without damage (compared to <8,000 cycles for the control sample); it has strong adhesion, with a special crosslinking agent forming a chemical bond with the base resin, achieving a grade 5 in the crosslink test and demonstrating good peel resistance; it strikes a balance between feel and durability, with the use of organic abrasion-resistant particles and lubricants improving abrasion resistance while maintaining the soft touch of the fabric; it has excellent environmental resistance, with the crosslinked network structure giving the coating superior resistance to washing, perspiration, and aging; it is environmentally friendly and efficient, using water as a medium and having low VOC content; and its simple preparation process makes it suitable for continuous production.

[0071] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A friction-resistant coating for textiles, characterized in that: It includes waterborne polyurethane resin, surface-modified inorganic nanoparticles, organic polymer wear-resistant microspheres, crosslinking agents, lubricants, additives, and water.

2. The abrasion-resistant coating for textiles according to claim 1, characterized in that: The product comprises, by weight, 100 parts of waterborne polyurethane resin, 5-25 parts of surface-modified inorganic nanoparticles, 3-15 parts of organic polymer wear-resistant microspheres, 1-10 parts of crosslinking agent, 0.5-5 parts of lubricant, and 0.5-5 parts of additives.

3. The abrasion-resistant coating for textiles according to claim 1, characterized in that: The surface-modified inorganic nanoparticles are silane coupling agent-modified nano-silica; the organic polymer wear-resistant microspheres are polyurea-formaldehyde resin microcapsules; the crosslinking agent is a carbodiimide crosslinking agent; the lubricant is a polyethylene wax emulsion; and the additive is a polyether-modified organosiloxane.

4. A method for preparing a friction-resistant coating on a textile as described in claim 1, characterized in that: It includes two steps: solution preparation and solution spraying; S1, Solution preparation; S11. Surface-modified inorganic nanoparticles, part of waterborne polyurethane resin, appropriate amount of additives and water are mixed and processed with a high-speed disperser to obtain a pre-dispersed slurry. S12: Mix the pre-dispersed slurry with the remaining aqueous polyurethane resin, organic polymer wear-resistant microspheres, lubricant, and additives to obtain the main agent; S13: Before use, add crosslinking agent to the main agent, stir at low speed, and then let it stand to mature to obtain the spraying solution; S2. Solution spraying: The spraying solution obtained in step S13 is sprayed onto the surface of the textile.

5. The method for preparing a friction-resistant coating on a textile according to claim 4, characterized in that: The surface-modified inorganic nanoparticles are silane coupling agent-modified nano-silica; the organic polymer wear-resistant microspheres are polyurea-formaldehyde resin microcapsules; the crosslinking agent is a carbodiimide crosslinking agent; the lubricant is a polyethylene wax emulsion; and the additive is a polyether-modified organosiloxane.

6. The method for preparing a friction-resistant coating on a textile according to claim 4, characterized in that: Step S2 includes the following steps: S21, Vacuuming; S22, Plasma cleaning and activation; S23, Vacuum spraying; S24, ionization curing and heat curing.

7. The method for preparing a friction-resistant coating on a textile according to claim 6, characterized in that: Specifically, step S21 involves placing the textile into a plasma cleaning chamber and evacuating it to a vacuum of 0.8 Pa.

8. The method for preparing a friction-resistant coating on a textile according to claim 6, characterized in that: Specifically, step S22 involves introducing 100 sccm of argon / oxygen gas after the vacuum level is reached, and then turning on the plasma instrument for cleaning after the vacuum stabilizes.

9. The method for preparing a friction-resistant coating on a textile according to claim 6, characterized in that: Specifically, step S23 involves placing the textile into a movable spraying chamber after cleaning, spraying the spraying solution obtained in step S13, setting the spraying flow rate to 20 ml / min, the nozzle moving speed within the chamber to 60 mm / s, and the spraying time to 80 s.

10. The method for preparing a friction-resistant coating on a textile according to claim 6, characterized in that: Specifically, step S24 involves placing the textile into a heat curing chamber after spraying, setting the chamber temperature to 80 degrees Celsius, introducing argon gas at 300 sccm after the temperature is reached, and performing plasma curing after the vacuum stabilizes. After curing is complete, heating is stopped, the vacuum is broken for 1 second, and then the gas is evacuated to 6 Pa. This process is repeated to rapidly cool down to 40 degrees Celsius, completely breaking the vacuum, and the product manufacturing is completed.

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