Novel flax knitted fabric

Abstract

The invention belongs to the technical field of fabrics, and discloses a novel flax knitted fabric, which prolongs the existence time of an anti-wrinkle coating through the dual effects of mechanical occlusion of nano-particles and flax coils and chemical bonding of plasma-treated flax fibers and titanium hydroxyl, so that the anti-wrinkle performance of the fabric is improved, and the anti-wrinkle performance of the fabric is improved. The service time of the linen fabric is prolonged, the surface activity and hydrophilicity of the fibers are remarkably improved, the efficiency is improved for subsequent dry-method coating spraying, the process is simplified, damage of high temperature to the fiber structure is avoided, and the original texture of the fabric is kept.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric technology, and particularly relates to a novel linen knitted fabric. Background Art

[0002] As a natural fiber, flax boasts excellent breathability, moisture absorption, and a comfortable feel, making it widely used in clothing, furniture, and industrial textiles. Flax fiber is a typical cellulose fiber with high crystallinity and orientation. However, due to the loose arrangement of the coils in the flax knit structure, it lacks strong internal support, making it susceptible to deformation under external forces and difficult to restore to its original shape. Furthermore, flax fiber has a smooth surface and few polar groups, resulting in a low coefficient of friction and weak bonding between fibers, further exacerbating the problems of wrinkling and difficulty in shaping the fabric.

[0003] To solve the above problems, at present, the industry often uses resin finishing to enhance the bonding force between fibers to improve the dimensional stability and wrinkle resistance of the fabric. However, this method will make the fabric feel harder and release harmful substances such as formaldehyde. The effect will gradually weaken after washing and the durability is poor. Summary of the Invention

[0004] In response to the problems mentioned in the above background technology that linen knitted fabrics are easy to wrinkle and the use of resin finishing method will release harmful substances such as formaldehyde and change the feel of the linen knitted fabrics, the present invention provides a new type of linen knitted fabric, which can not only effectively improve the wrinkle resistance of linen knitted fabrics, but also maintain the original texture and meet the requirements of green production.

[0005] The technical solution adopted by the present invention is as follows: a new type of linen knitted fabric, the preparation method of which comprises the following steps: 1) Plasma activation treatment is performed on a smooth and wrinkle-free linen knitted fabric by passing a mixed gas of argon and oxygen to obtain a plasma-pretreated linen knitted fabric; 2) dry-spraying the plasma-pretreated flax knitted fabric obtained in step 1) with an anti-wrinkle powder to obtain an anti-wrinkle coated flax knitted fabric; 3) The linen knitted fabric with the anti-wrinkle coating obtained in step 2) is heated and cured, and after curing, the temperature is lowered to obtain a novel linen knitted fabric.

[0006] The present invention performs plasma surface activation on linen knitted fabrics and then dry-sprays a composite coating formed by nano-titanium oxide and acrylic resin to enhance the cross-linking degree between fibers, improve strong morphological stability, and achieve a long-lasting anti-wrinkle effect. Argon-oxygen plasma is used to modify the surface of the linen knitted fabric, destroying the fiber surface of the linen fiber so that the surface of the linen fiber changes from a smooth and inert state to a subsequent rough and active surface, providing reaction sites for the cross-linking of the subsequent coating. At the same time, the nano-titanium oxide rich in titanium hydroxyl groups on the surface undergoes a dehydration condensation reaction with the carboxyl groups generated on the surface of the linen fiber by plasma activation, forming a stable ester bond covalent cross-linking, and the nanoparticles are embedded in the gaps between the linen coils. The grooves on the fiber surface become nano-anchor points connecting the fiber and the coating through the dual effects of mechanical bite and chemical bonding, which specifically solves the problems of smooth surface and low friction coefficient of flax fiber, making the coating less likely to fall off due to external friction. While improving the anti-wrinkle performance, it can maintain the original texture of the linen fabric. Due to the dual effects of mechanical bite and chemical bonding, the existence time of the anti-wrinkle coating is extended, and the service life of the linen fabric is increased. Plasma surface activation and dry spraying are carried out continuously, reducing intermediate steps, improving production efficiency, reducing energy consumption, and saving production costs. At the same time, no liquid chemicals are used in the entire process, reducing the possibility of environmental pollution.

[0007] Furthermore, in step 2), the anti-wrinkle powder is a mixed powder of nano-titanium oxide, micron-sized acrylic resin and talc.

[0008] Furthermore, the addition mass ratio of nano-titanium oxide and micron-sized acrylic resin is (5-20): (80-95), and the addition amount of talc powder is 1-2% of the total weight of the mixed powder.

[0009] Preferably, the particle size of the micron-sized acrylic resin is less than 10 μm.

[0010] Furthermore, in step 1), the time of plasma activation treatment is 1-3 min / m 2 .

[0011] Furthermore, in step 1), the volume ratio of the introduced argon and oxygen mixed gas is (50-60): (40-50).

[0012] Furthermore, the thickness of the dry-sprayed anti-wrinkle powder is 1-3 μm.

[0013] Preferably, the dry spraying is electrostatic spraying or air flow spraying.

[0014] Furthermore, in step 3), the temperature for heating and curing is 80-120°C.

[0015] Furthermore, in step 3), the heating and curing time is 5 to 10 minutes.

[0016] Furthermore, in step 3), after the heating and curing is completed, the temperature is lowered to 20-25°C.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1) The present invention prolongs the existence of the anti-wrinkle coating and the service life of the linen fabric through the dual effects of mechanical interlocking of nanoparticles with flax coils and chemical bonding of plasma-treated flax fibers with titanium hydroxyl groups. This significantly improves the surface activity and hydrophilicity of the fiber, improves the efficiency of subsequent dry spray coating, simplifies the process, avoids high-temperature damage to the fiber structure, and maintains the original texture of the fabric.

[0018] 2) The present invention applies a nano-titanium oxide-acrylic resin coating on the surface of the linen knitted fabric to enhance the cross-linking between the fibers and enhance the stability of the fabric morphology. At the same time, the coating material forms a strong chemical bond with the fiber surface, and the anti-wrinkle effect lasts.

[0019] 3) Dry spraying reduces the amount of chemicals used and facilitates the control of coating thickness, ensuring that the original texture and breathability of the fabric are not affected, and ensuring the comfort of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 This is the process flow for preparing the novel flax knitted fabric of the present invention. DETAILED DESCRIPTION

[0021] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0022] Example 1 The process flow of preparing the novel linen knitted fabric of the present invention is as follows: Figure 1 As shown, the specific steps are: 1) Plasma pretreatment Fix the smooth and wrinkle-free linen knitted fabric and use pure argon gas to clean the surface of the linen knitted fabric for 2 minutes / m 2 Then switch to argon oxygen mixed gas for surface activation treatment for 3min / m 2 , obtaining plasma pretreated linen knitted fabrics, wherein the gas flow rates of the argon-oxygen mixed gas are 50 sccm of argon and 50 sccm of oxygen.

[0023] 2) Dry spraying Weigh 1 part talc, 10 parts nano-titanium oxide, and 89 parts micron-sized acrylic resin by weight and mix thoroughly with a stirrer until no agglomerates are present to produce an anti-wrinkle powder. Use an airflow sprayer at 0.4 MPa and a nozzle distance of 220 mm from the fabric to spray the anti-wrinkle powder onto the plasma-pretreated linen knitted fabric obtained in step 1) to a thickness of 2 μm, resulting in an anti-wrinkle coated linen knitted fabric. The average particle size of the micron-sized acrylic resin is 5 μm.

[0024] 3) Thermal curing The linen knitted fabric with the anti-wrinkle coating obtained in step 2) is heat-cured in an oven at 80° C. for 8 minutes, taken out, and cooled to 25° C. to obtain a novel linen knitted fabric.

[0025] 4) Testing The new linen knitted fabric obtained in step 3) was subjected to wrinkle angle measurement, air permeability test, and wash fastness test.

[0026] Wrinkle Angle Measurement: Cut a rectangular specimen of the new linen knitted fabric obtained in step 3) into a size of 5 cm × 10 cm and place it flat on a test bench. Use a 500 g standard weight to apply pressure to the specimen to create a 90° crease. Then remove the weight and allow the specimen to recover naturally for 5 minutes. Then use a protractor to measure the crease angle of the recovered specimen. Record the warp and weft wrinkle angles and calculate the average value.

[0027] Air permeability test: Cut the new linen knitted fabric obtained in step 3) into a circular sample with a diameter of 5 cm, fix it flat on the air permeability tester, make sure it is not taut and has no wrinkles, and measure the air permeability at 20 cm in 30 seconds under 100 Pa. 2 The air flow rate through the chamber was repeated 3 times and the average value was taken.

[0028] Washing fastness test: Wash according to ISO105-C06. Place a rectangular sample of 5cm x 10cm in the washing machine. After adding an appropriate amount of detergent, wash it in a cycle at 40°C for 5 times. After each wash, remove the sample and dry it at simulated room temperature. Then, perform the wrinkle angle test to determine the washing fastness (grades 1 to 5).

[0029] Coating adhesion test: Use 3M tape to adhere tightly to the coating surface and quickly peel it off at a 90° angle. Repeat three times and observe the percentage of coating peeling area.

[0030] Comparative Example 1 The only difference between this comparative example and Example 1 is that in this comparative example, the linen knitted fabric is not subjected to plasma pretreatment, and the rest of the process is the same as that of Example 1.

[0031] Table 1 Effect of plasma pretreatment on the properties of linen knitted fabrics Whether plasma pretreatment is performed Anti-wrinkle angle Air permeability (mm / s) Coating shedding rate% Example 1 yes 145° 115 ＜5 Comparative Example 1 no 120° 120 ＞20 From the data in Table 1, it can be concluded that plasma treatment of linen knitted fabric significantly increases the wrinkle angle and improves the anti-wrinkle performance. At the same time, the air permeability of linen knitted fabric is enhanced after plasma treatment. The reason is speculated to be: the surface of the linen knitted fabric is modified by argon-oxygen plasma, and the fiber surface of the linen is destroyed, so that the surface of the linen fiber changes from a smooth and inert surface to a subsequent rough active surface, providing reaction sites for the subsequent cross-linking of the coating; at the same time, the nano-titanium oxide rich in titanium hydroxyl groups on the surface undergoes a dehydration condensation reaction with the carboxyl groups generated on the surface of the linen fiber by plasma activation, forming a stable ester bond covalent cross-linking. The nanoparticles are embedded in the fiber surface grooves in the gaps between the flax coils. Through the dual effects of mechanical bite and chemical bonding, they become nano-anchor points connecting the fiber and the coating, which specifically solves the problem of the smooth surface and low friction coefficient of the flax fiber, making the coating less likely to fall off due to external friction. While improving the anti-wrinkle performance, it can maintain the original texture of the linen fabric. Due to the dual effects of mechanical bite and chemical bonding, the existence time of the anti-wrinkle coating is extended, thereby improving the service life of the linen fabric.

[0032] Comparative Example 2 The only difference between this comparative example and Example 1 is that in this comparative example, in step 2), the components of the anti-wrinkle powder are: 1 part of talc powder and 99 parts of micron-grade acrylic resin. The rest of the process is the same as that of Example 1.

[0033] Comparative Example 3 The only difference between this comparative example and Example 1 is that in this comparative example, in step 2), the components of the anti-wrinkle powder are: 1 part of talc powder, 25 parts of nano-titanium oxide, and 74 parts of micron-sized acrylic resin. The rest of the process is the same as in Example 1.

[0034] Table 2 Effect of the addition of nano-titanium oxide on the properties of linen fabric Addition amount of nano titanium oxide Anti-wrinkle angle Wash fastness Example 1 10 servings 145° 3 Comparative Example 2 0 copies 120 4 Comparative Example 3 25 servings 155° 3.5 From the data in Table 2, it can be concluded that if too little nano-titanium oxide is added, the wrinkle resistance and wash fastness of the final linen fabric will decrease. The reasons are speculated to be: when no nano-titanium oxide is added to the anti-wrinkle powder or the addition amount is too little, the cross-linking degree between fibers cannot be enhanced, and the anti-wrinkle performance is weakened; when the addition amount of nano-titanium oxide is too high, although the anti-wrinkle performance will be improved to a certain extent, the wash fastness will decrease at the same time. At the same time, too much titanium oxide will reduce the fluidity of the powder, resulting in uneven coating.

[0035] Unless otherwise specified, the raw materials and equipment used in the present invention are commonly used in the art; the methods used in the present invention are conventional methods in the art unless otherwise specified.

[0036] The above-described embodiments merely represent specific implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present application. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the technical concept of the present application, and all such variations and improvements fall within the scope of protection of the present application.

Claims

1. A method for preparing a novel linen knitted fabric, characterized in that: The following steps are involved: 1) Plasma activation treatment is performed on a smooth and wrinkle-free linen knitted fabric by passing a mixed gas of argon and oxygen to obtain a plasma-pretreated linen knitted fabric; 2) dry-spraying the plasma-pretreated flax knitted fabric obtained in step 1) with an anti-wrinkle powder to obtain an anti-wrinkle coated flax knitted fabric; 3) The linen knitted fabric with the anti-wrinkle coating obtained in step 2) is heated and cured, and after curing, the temperature is lowered to obtain a novel linen knitted fabric.

2. The method for preparing a novel linen knitted fabric according to claim 1, characterized in that: In step 2), the anti-wrinkle powder is a mixed powder of nano titanium oxide, micron-sized acrylic resin and talc.

3. The method for preparing a novel linen knitted fabric according to claim 2, characterized in that: The added mass ratio of nano-titanium oxide and micron-sized acrylic resin is (5-20): (80-95), and the added amount of talc powder is 1-2% of the total weight of the mixed powder.

4. The method for preparing a novel linen knitted fabric according to claim 1, characterized in that: In step 1), the plasma activation treatment time is 1~3min / m2.

5. The method for preparing a novel linen knitted fabric according to claim 1 or 4, characterized in that: In step 1), the volume ratio of the introduced argon and oxygen mixed gas is (50-60): (40-50).

6. The method for preparing a novel linen knitted fabric according to claim 1, characterized in that: In step 2), the thickness of the anti-wrinkle powder sprayed by dry method is 1~3μm.

7. The method for preparing a novel linen knitted fabric according to claim 1, characterized in that: In step 3), the temperature for heating and curing is 80-120°C.

8. The method for preparing a novel linen knitted fabric according to claim 1 or 7, characterized in that: In step 3), the heating and curing time is 5 to 10 minutes.

9. The method for preparing a novel linen knitted fabric according to claim 8, characterized in that: In step 3), after the heating and curing is completed, the temperature is lowered to 20~25℃.

10. A novel linen knitted fabric prepared according to the preparation method according to any one of claims 1 to 9.

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