Heather grey knitted fabric and preparation method thereof

Abstract

The invention relates to the technical field of textile fabrics, and specifically discloses a heather grey knitted fabric and a preparation method thereof, comprising the following steps: S1, weaving: using SB / T blended yarn for weft knitting, the SB / T blended yarn is blended by natural color soybean protein fiber and white conventional polyester yarn by ring spinning technology; S2, pre-treatment; S3, single dyeing SB: using acid black single dyeing natural color soybean protein fiber; S4, pickling modification: the acid treatment liquid contains hydrochloric acid and sodium nitrite; S5, UV irradiation: after drying in the shade, spraying a spiropyran derivative aqueous solution on the front side, sending it into an ultraviolet irradiation box, and irradiating it on both sides; S6, washing and shaping. The invention realizes both heather grey and color change effects, can present a visual color different from normal heather grey under ultraviolet light, and improves the color fastness of the dye and the adhesion fastness of the reversible color change spiropyran structure.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, and in particular to a heather grey knitted fabric and a preparation method thereof. Background Art

[0002] Heather grey knitted fabric is a knitted fabric made of heather grey yarn. It is widely used in T-shirts, jackets, cotton sweaters, etc. The black and white knots of heather grey yarn are spaced in the length direction of the yarn to present a heather grey effect. Heather grey yarn is generally blended with polyester yarn and other fibers such as cationic polyester yarn. There are two main methods to obtain heather grey knitted fabric. One method is to blend one fiber of the heather grey yarn with black and the other with white. This method generally requires adding colorants to the spinning melt, which can achieve high black fastness, but it is difficult to increase other effects. Another method is to use the different dyeing properties of the two fibers to achieve single dyeing of one fiber while leaving the other fiber uncolored, but the color fastness of this method needs to be improved.

[0003] In addition, with the improvement of living standards and the development of science and technology, people have new demands for textiles, including color-changing fabrics, while heather grey knitted fabrics only show a fixed heather grey color when worn. Even though photosensitive materials are used in the prior art to make color-changing fabrics, there has been no research on the dual effects of heather grey and color change, and the color-changing raw materials are mainly attached to the surface of the fabric using dyeing technology or impregnation finishing technology, and there has been no relevant research on their bonding strength on the heather grey yarn. Summary of the invention

[0004] The invention aims to provide a heather grey knitted fabric and a preparation method thereof, which has both heather grey and color-changing effects and can present a visual color different from normal heather grey under ultraviolet light.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is:

[0006] A method for preparing hemp grey knitted fabric comprises the following steps:

[0007] S1. Weaving: Weft knitting is performed using SB / T blended yarn, wherein the SB / T blended yarn is blended from natural soybean protein fiber and white conventional polyester yarn using ring spinning technology;

[0008] S2. Pretreatment: The padding enzyme desizing process is adopted, the stacking temperature is 70℃~80℃, the stacking time is 60min-90min, and the desizing liquid composition is 2.5g / L~4.0g / L high temperature enzyme 2000L and 1.5g / L~2.5g / L non-ionic penetrant JFC;

[0009] S3, single dyeing SB: acid black single dyeing natural color soybean protein fiber, bath ratio 1:10-15, pH value 4.5-5.5, heating rate 1.0℃ / min~1.5℃ / min, dyeing temperature 80℃~90℃, dyeing time 45min-60min, cold washing, warm water washing, cold washing again and color fixing treatment after dyeing;

[0010] S4, acid modification: the grey cloth after the color fixing treatment in step S3 is dried flat, cooled and then padded with an acid treatment solution, the acid treatment temperature is 2°C to 5°C, the acid treatment time is 30min-50min, the acid treatment solution contains hydrochloric acid and sodium nitrite, the molar ratio of hydrochloric acid to acid black is 6.3-6.5:1, and the molar ratio of sodium nitrite to acid black is 2.2-2.5:1;

[0011] S5, UV irradiation: After the grey cloth treated with acid dipping and modification in step S4 is dried in the shade, an aqueous solution of a spiropyran derivative is sprayed on the front side and sent into a UV irradiation box for double-sided irradiation; the structural formula of the spiropyran derivative is as follows:

[0012]

[0013] S6, washing and setting.

[0014] Preferably, the denier of the SB / T blended yarn is 100D.

[0015] Preferably, the blending ratio of the natural color soybean protein fiber and the white conventional polyester yarn in the SB / T blended yarn is 30 / 70.

[0016] Preferably, the weft knitting structure in step S1 is a plain weft knitting structure or a double-sided jacquard structure.

[0017] Preferably, the dye solution in step S3 is composed of: 2.5% to 3.0% acid black, 0.3g / L to 0.5g / L leveling agent, 2g / L to 4g / L glacial acetic acid, and 10g / L to 15g / L sodium sulfate.

[0018] Preferably, the color fixing treatment in step S3 uses 4% to 6% color fixing agent XG, 1g / L to 2g / L glacial acetic acid, and 0.2mL / L to 0.3mL / L peregrin O.

[0019] Preferably, the step S4 adopts three dipping and three rolling.

[0020] Preferably, the ultraviolet irradiation process of step S5 is: irradiation time 20min-30min, irradiation distance 10cm-15cm, and ultraviolet lamp wattage 15W-20W.

[0021] The invention also provides a hemp grey knitted fabric prepared by the above preparation method.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The yarn for the heather grey knitted fabric of the present invention adopts SB / T blended yarn (SB is the abbreviation of soybean protein fiber, and T is the abbreviation of polyester). Conventional polyester is difficult to be dyed with acid dyes, but the surface of soybean protein fiber is rich in carboxyl groups and amino groups and has affinity for acid dyes. The present invention utilizes the different dyeing properties of the two fibers and uses acid black single dyeing of soybean protein fiber, so as to obtain heather grey effect in fabric dyeing and finishing.

[0024] The acidic black molecule contains a sulfonic acid group and an aromatic primary amine group. In the single dyeing step, the sulfonic acid group is electrostatically adsorbed with the soybean protein fiber and combined with sodium sulfate to achieve black level dyeing. Then, the dyed grey cloth is further acid-modified. During the acid-modification, the aromatic primary amine group of the dye undergoes a diazotization reaction. Excessive hydrochloric acid and sodium nitrite convert the two aromatic primary amines in the acidic black molecular structure into diazonium salts and inhibit the generation of diazoamino compounds. The numerous diazonium salts of the acidic black can electrostatically adsorb with the carboxyl groups of the soybean protein fiber and the carboxyl groups of the spiropyran derivatives and react with denitrification under UV light to achieve covalent bonding of the dye to the soybean protein fiber and covalent bonding of the dye to the spiropyran derivative, thereby achieving both heather gray and color-changing effects, being able to present a visual color different from normal heather gray under ultraviolet light, and improving the color fastness of the dye and the adhesion fastness of the reversibly color-changing spiropyran structure.

[0025] Since conventional polyester does not react with acid black and spiropyran derivatives, the color change effect is also fixed at the black color knot. The spiropyran derivative of the present invention is colorless under visible light and turns into purple under ultraviolet light. DETAILED DESCRIPTION

[0026] Example 1

[0027] The present embodiment provides a heather grey knitted fabric, and the preparation method thereof comprises the following steps: weaving→pretreatment→single dyeing SB→acid modification→UV irradiation→washing and setting.

[0028] The weaving step uses 100D SB / T blended yarn for weft knitting into a weft plain needle structure. The SB / T blended yarn is blended by natural color soybean protein fiber and white conventional polyester yarn in a blending ratio of 30 / 70 using ring spinning technology. Specifically, the natural color protein fiber and the white conventional polyester yarn are respectively subjected to preliminary cotton cleaning and carding processes to obtain raw slivers, and then the raw slivers are sequentially drawn, roving, spun yarn and wound to obtain SB / T blended yarn.

[0029] The cotton cleaning process is to first use the A002D cotton plucking machine to grab the fibers (beater speed 680 r / min), and send the fibers to the A006B mixing cotton opener for mixing through the condenser (beater speed 400 r / min), and then send the fibers to the FA106A cotton opener for opening operation (beater speed 420 r / min, cotton feeding roller ~ beater spacing 13mm), and then feed the opened fibers to the FA046A double cotton box cotton feeder (cotton stripping beater 400 r / min, cotton averaging beater 300 r / min, return roller 435 r / min) through the A045 condenser, and finally transport them to the FA141 single beater lap machine (combing needle beater 900 r / min, cotton feeding roller ~ beater spacing 10mm).

[0030] The carding process is carried out on an A186F carding machine, with a cylinder speed of 305 r / min, a licker-in roller of 780 r / min, a cover plate of 98 mm / min, a doffer of 21.5 r / min, a feed plate-licker-in roller gauge of 0.28 mm, a licker-in roller-cylinder gauge of 0.28 mm, a cylinder-doffer gauge of 0.13 mm, and a small leak bottom inlet gauge of 8 mm.

[0031] The drawing process is carried out in three stages on a FA302 drawing frame, the roving process is carried out on an A454G roving frame (post-drafting 1.29 times, twist 3.16 twists / 10cm, twist coefficient 68, front roller speed 234 r / min, spindle speed 640 r / min, nip gap 5.5mm), and the spinning process is carried out on a FA502 spinning frame (post-drafting 1.29 times, twist direction Z, twist 97.5 twists / 10cm, twist coefficient 384, front roller speed 218 r / min, spindle speed 16700 r / min, roller pressure 18 daN×12 daN×14 daN).

[0032] In this embodiment, the pretreatment step adopts a padding enzyme desizing process, with a stacking temperature of 75° C., a stacking time of 60 min, and a desizing solution composition of 3 g / L high-temperature enzyme 2000L and 2.5 g / L non-ionic penetrant JFC.

[0033] In this embodiment, the single dyeing SB step uses acid black single dyeing natural color soybean protein fiber, the bath ratio is 1:10, the pH value is 4.5-5.5, the heating rate is 1.0℃ / min, the dyeing temperature is 85℃, the dyeing time is 60min, and after the dyeing is completed, cold washing, warm water washing, cold washing again and fixing treatment are performed.

[0034] The dye solution is composed of: 3.0% acid black, 0.45g / L peregal O, 2.5g / L glacial acetic acid, 15g / L sodium sulfate. The color fixation treatment uses 5% color fixative XG, 1.5g / L glacial acetic acid, and 0.25mL / L peregal O. The structural formula of acid black is as follows:

[0035]

[0036] In this embodiment, the acid modification step is to dry the grey cloth after the color fixation treatment in an open width, cool it, and then immerse it in an acid treatment solution, three times of immersion and three times of rolling, the vehicle speed is 10m / min, the acid treatment temperature is 4°C, and the acid treatment time is 45min. The acid treatment solution contains hydrochloric acid and sodium nitrite, and the molar ratio of hydrochloric acid to acid black is 6.3:1, and the molar ratio of sodium nitrite to acid black is 2.5:1.

[0037] The UV irradiation step includes: drying the acid-modified grey cloth in the shade, spraying the spiropyran derivative aqueous solution on the front side, sending it into the UV irradiation box, irradiating it on both sides, the irradiation time is 30 minutes, the irradiation distance is 10 cm, and the wattage of the UV lamp is 15W; the structural formula of the spiropyran derivative is as follows:

[0038]

[0039] Example 2

[0040] This embodiment provides a hemp grey knitted fabric, and the preparation method thereof comprises the following steps:

[0041] S1. Weaving: 100D SB / T blended yarn is used for weft knitting to form a double-sided jacquard structure. The SB / T blended yarn is made of natural soybean protein fiber and white conventional polyester yarn at a blending ratio of 30 / 70 using ring spinning technology.

[0042] S2. Pretreatment: The padding enzyme desizing process was adopted, the stacking temperature was 70°C, the stacking time was 80 min, and the desizing solution composition was 2.5g / L high temperature enzyme 2000L and 2g / L non-ionic penetrant JFC.

[0043] S3. Single dyeing SB: Use acid black single dyeing natural color soybean protein fiber, the bath ratio is 1:10, the pH value is 4.5-5.5, the heating rate is 1.0℃ / min, the dyeing temperature is 90℃, the dyeing time is 45min, and after dyeing, it is cold washed, warm water washed, cold washed again and fixed.

[0044] The dye solution is composed of 3.0% acid black, 0.5g / L peregrin O, 3g / L glacial acetic acid, and 12g / L sodium sulfate. The color fixation treatment uses 5% color fixative XG, 2g / L glacial acetic acid, and 0.2mL / L peregrin O.

[0045] S4, acid modification: the grey cloth after color fixation treatment is dried flat, cooled and then padded with acid treatment solution, three times of immersion and three times of rolling, the vehicle speed is 10m / min, the acid treatment temperature is 5°C, the acid treatment time is 45min, the acid treatment solution contains hydrochloric acid and sodium nitrite, the molar ratio of hydrochloric acid to acid black is 6.5:1, and the molar ratio of sodium nitrite to acid black is 2.2:1.

[0046] S5. UV irradiation: After the acid-modified grey cloth is dried in the shade, an aqueous solution of spiropyran derivatives is sprayed on the front side, and then sent into a UV irradiation box for double-sided irradiation. The irradiation time is 30 minutes, the irradiation distance is 10 cm, and the wattage of the UV lamp is 15W.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims

1. A method for preparing a heather grey knitted fabric, characterized in that: The steps include: S1. Weaving: Weft knitting is performed using SB / T blended yarn, wherein the SB / T blended yarn is blended from natural soybean protein fiber and white conventional polyester yarn using ring spinning technology; S2. Pretreatment: The padding enzyme desizing process is adopted, the stacking temperature is 70℃~80℃, the stacking time is 60min-90min, and the desizing liquid composition is 2.5g / L~4.0g / L high temperature enzyme 2000L and 1.5g / L~2.5g / L non-ionic penetrant JFC; S3, single dyeing SB: acid black single dyeing natural color soybean protein fiber, bath ratio 1:10-15, pH value 4.5-5.5, heating rate 1.0℃ / min~1.5℃ / min, dyeing temperature 80℃~90℃, dyeing time 45min-60min, cold washing, warm water washing, cold washing again and color fixing treatment after dyeing; S4, pickling modification: the grey cloth after the color fixing treatment in step S3 is dried in an open width, cooled, and then padded with an acid treatment solution, three times of immersion and three times of rolling, the speed is 10m / min, the acid treatment temperature is 2°C to 5°C, the acid treatment time is 30min-50min, the acid treatment solution contains hydrochloric acid and sodium nitrite, the molar ratio of hydrochloric acid to acid black is 6.3-6.5:1, and the molar ratio of sodium nitrite to acid black is 2.2-2.5:1; The structural formula of acid black is as follows: ； S5, UV irradiation: after the grey cloth treated by acid dipping in step S4 is dried in the shade, an aqueous solution of spiropyran derivatives is sprayed on the front side, and then it is sent into a UV irradiation box for double-sided irradiation. The irradiation time is 20min-30min, the irradiation distance is 10cm-15cm, and the wattage of the UV lamp is 15W-20W; The structural formula of the spiropyran derivative is as follows: ； S6, washing and setting; The color change effect of heather gray fabric is fixed at the black color knot. The spiropyran derivative is colorless under visible light and turns purple under ultraviolet light.

2. The method for preparing the hemp grey knitted fabric according to claim 1, characterized in that: The denier of the SB / T blended yarn is 100D.

3. The method for preparing the hemp grey knitted fabric according to claim 1, characterized in that: The blending ratio of the natural color soybean protein fiber and the white conventional polyester yarn in the SB / T blended yarn is 30 / 70.

4. The method for preparing the hemp grey knitted fabric according to claim 1, characterized in that: The weft knitting structure in step S1 is a plain weft knitting structure or a double-sided jacquard structure.

5. The method for preparing the heather grey knitted fabric according to claim 1, characterized in that: The dyeing solution in step S3 is composed of: 2.5% to 3.0% acid black, 0.3g / L to 0.5g / L leveling agent, 2g / L to 4g / L glacial acetic acid, and 10g / L to 15g / L sodium sulfate.

6. The method for preparing the heather grey knitted fabric according to claim 1, characterized in that: The color fixing treatment in step S3 uses 4% to 6% color fixing agent XG, 1g / L to 2g / L glacial acetic acid, and 0.2mL / L to 0.3mL / L Peregrine O.

7. A heather grey knitted fabric, characterized in that: The method is prepared according to any one of claims 1 to 6.

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