Processing method for improving formaldehyde content of tencel a100-containing fabric

Abstract

The present application belongs to the field of textile finishing technology, and particularly relates to a processing method for improving the formaldehyde content of a Tencel A100-containing fabric. The processing method for improving the formaldehyde content of a Tencel A100-containing fabric comprises the following steps: grey cloth -> singeing -> desizing -> scouring -> bleaching -> tentering -> preshrinking -> rolling; the grey cloth contains Tencel A100 with a mass content of 50% or more; the bleaching process: adding ethanol into a bleaching steaming oven. The tentering process: immersing the bleached fabric in a treating liquid, and the treating liquid comprises the following components: softener SMI-62, softener TUBINGAL PURE, and formaldehyde capturing agent FDS. The bleaching finishing process and the tentering treating liquid component are reasonably configured, have good penetration performance for the Tencel A100-containing fabric with a mass content of 50% or more, can maximize the protection of the crosslinking auxiliary agent, capture free formaldehyde, and realize the formaldehyde content of the fabric within 30 ppm.

Description

Technical Field

[0001] This invention belongs to the field of textile finishing technology, specifically relating to a processing method for improving the formaldehyde content of fabrics containing Tencel A100. Background Technology

[0002] In order to improve the fibrillation of Tencel fibers, manufacturers introduce cross-linking agents into the fiber production process to cross-link and tame the fibers. However, this cross-linking reaction is easily destroyed under acidic or alkaline conditions during subsequent finishing processes, causing fibrillation to recur and releasing large amounts of formaldehyde.

[0003] Garments made from cross-linked Tencel fabrics may cause itching and other health problems due to excessive formaldehyde content. Currently, most dyeing and printing companies use thorough washing to reduce formaldehyde levels in finished fabrics to below 75 ppm, but this cannot guarantee that formaldehyde will not be released during wear, thus posing a health risk.

[0004] Patent CN104562688A discloses a method for preparing environmentally friendly textiles that reduces formaldehyde by adding polyols to the finishing solution, which reduces the amount of formaldehyde released to below 400 ppm. However, the amount of formaldehyde released is still too high and does not meet the standards. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a processing method for improving the formaldehyde content of Tencel A100 fabrics. A special processing technique is employed to ensure that both the formaldehyde content and formaldehyde release of the finished fabric are far below the 75ppm standard, with both free and released formaldehyde content below 30ppm, thus enhancing the fabric's safety and environmental performance. The processing technology is convenient, provides stable quality, aligns with current energy-saving and environmentally friendly development concepts, and has promising prospects for widespread application.

[0006] The processing method for improving the formaldehyde content of Tencel A100 fabric according to the present invention includes the following steps:

[0007] Greige fabric → singeing → desizing → scouring → bleaching → stretching → pre-shrinking → rolling;

[0008] The greige fabric contains more than 50% by mass of Tencel A100;

[0009] The bleaching process involves adding ethanol to the bleaching steam oven.

[0010] The desizing process consists of: desizing enzyme: 2-4 g / L, penetrant: 3-6 g / L, refining enzyme: 1-2 g / L, temperature: 95-98℃, and time: 15-20 min.

[0011] The boiling and refining process is as follows: NaOH: 10-20 g / L, refining agent: 2-4 g / L, penetrant: 4-6 g / L, chelating agent: 3-5 g / L, temperature: 100-102℃, time: 20-25 min.

[0012] The stretching process involves immersing the bleached fabric in a treatment solution, the components of which include: SMI-62 softener (10-40 g / L), TUBINGAL PURE softener (20-40 g / L), and FDS formaldehyde scavenger (20-30 g / L). The above components are fully dissolved in water and mixed evenly to obtain the treatment solution, which is then dried.

[0013] The rolling allowance is 60-65%.

[0014] The drying temperature is 120-130℃ and the time is 30-60 seconds.

[0015] The concentration of the ethanol is 95 wt.%.

[0016] The bleaching process: Ethanol concentration in the bleaching steam oven: 10-20 mL / L, NaClO2: 35-40 g / L.

[0017] The bleaching process: The saturated steam temperature in the bleaching steam chamber is 102-104℃.

[0018] The bleaching process takes 20 to 30 minutes.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) The bleaching and finishing process and the stentering solution of this invention are reasonably configured, and have good penetration performance for fabrics containing more than 50% Tencel A100. It can maximize the protection of cross-linking auxiliaries and capture free formaldehyde, so that the formaldehyde content of the fabric is far below 75ppm, reaching less than 30ppm.

[0021] (2) This invention can both protect the existing cross-linking reaction on the fiber and make the fabric have a lower formaldehyde content, which greatly improves the safety performance of the fabric. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments, but the scope of protection of the present invention is not limited thereto.

[0023] Unless otherwise specified, all raw materials used in the examples were commercially available.

[0024] The ethanol was purchased from Zibo Danyang Chemical Co., Ltd., with a concentration of 95 wt.%.

[0025] SMI-62 fabric softener was purchased from Zibo Lurui Fine Chemical Co., Ltd.

[0026] The fabric softener, TUBINGAL PURE, was purchased from CHT Company.

[0027] The formaldehyde scavenging agent FDS was purchased from Zibo Lurui Fine Chemical Co., Ltd.

[0028] The desiccant DS-HT was purchased from Zibo Lurui Fine Chemical Co., Ltd.

[0029] The penetrant WA-M was purchased from Zibo Lurui Fine Chemical Co., Ltd.

[0030] The refined enzyme 601L was purchased from Tianjin Hongliyuan Industry and Trade Co., Ltd.

[0031] The refining agent CRC was purchased from Angga Chemical (China) Co., Ltd.

[0032] The penetrant ZFC-L was purchased from Jinan Shenghong New Material Technology Co., Ltd.

[0033] Chelating agent SQ-A was purchased from Zibo Lurui Fine Chemical Co., Ltd.

[0034] The fabric softener TranSoft 4911 was purchased from the Weifang branch of Chuanhua Zhilian Co., Ltd.

[0035] Example 1: Weave specifications: TENCEL50*C / TENCEL50*160*100*57 / 58, weave pattern: 2 / 2 twill, Tencel A100 content 80% by weight.

[0036] The processing method for improving the formaldehyde content of Tencel A100 fabric includes the following steps:

[0037] Greige fabric → singeing → desizing → scouring → bleaching → stretching → pre-shrinking → rolling.

[0038] 1) Singeing: Vehicle speed: 90m / min, flame intensity: 20mbar.

[0039] 2) Desizing: Desizing enzyme DS-HT: 3g / L, penetrant WA-M: 5g / L, refining enzyme 601L: 1g / L, temperature: 95℃, time: 15min.

[0040] 3) Boiling: NaOH: 20g / L, refining agent CRC: 4g / L, penetrant ZFC-L: 6g / L, chelating agent SQ-A: 4g / L, temperature: 100℃, time: 25min.

[0041] 4) Bleaching: NaClO2: 38g / L, ethanol: 10mL / L, temperature: 102℃, time: 25min.

[0042] 5) Stretching: The bleached fabric is immersed in the following treatment solution, the components of which include: softener SMI-62: 40g / L, softener TUBINGAL PURE: 20g / L, formaldehyde scavenger FDS: 20g / L. The above components are fully dissolved in water and mixed evenly to obtain the treatment solution. The pick-up rate is 60%. Then it is dried. The drying conditions are: 120℃, time 40s.

[0043] 6) Pre-shrinkage: Speed: 50m / min, compression distance: 8mm, rubber blanket temperature: 40℃, felt blanket temperature: 110℃, tension: 4kg.

[0044] 7) The pre-shrinked fabric is rolled up and the free formaldehyde content and the formaldehyde release content after aging for 72 hours are tested.

[0045] Example 2: Weave specifications: TENCEL60*CPT60*160*110*57 / 58, weave pattern: plain weave, Tencel A100 content 57% by weight.

[0046] The processing method for improving the formaldehyde content of Tencel A100 fabric includes the following steps:

[0047] Greige fabric → singeing → desizing → scouring → bleaching → stretching → pre-shrinking → rolling.

[0048] 1) Singeing: Vehicle speed: 90m / min, flame intensity: 20mbar.

[0049] 2) Desizing: Desizing enzyme DS-HT: 3g / L, penetrant WA-M: 5g / L, refining enzyme 601L: 1g / L, temperature: 95℃, time: 15min.

[0050] 3) Boiling: NaOH: 20g / L, refining agent CRC: 4g / L, penetrant ZFC-L: 6g / L, chelating agent SQ-A: 4g / L, temperature: 100℃, time: 25min.

[0051] 4) Bleaching: NaClO2: 38g / L, ethanol: 15mL / L, temperature: 103℃, time: 20min.

[0052] 5) Stretching: The bleached fabric is immersed in the following treatment solution, the components of which include: softener SMI-62: 35g / L, softener TUBINGAL PURE: 40g / L, formaldehyde scavenger FDS: 25g / L. The above components are fully dissolved in water and mixed evenly to obtain the treatment solution. The pick-up rate is 62%. Then it is dried. The drying conditions are: 130℃, time 30s.

[0053] 6) Pre-shrinkage: Speed: 50m / min, compression distance: 8mm, rubber blanket temperature: 40℃, felt blanket temperature: 110℃, tension: 4kg.

[0054] 7) The pre-shrinked fabric is rolled up and the free formaldehyde content and the formaldehyde release content after aging for 72 hours are tested.

[0055] Example 3: Weave specifications: C / TENCEL30*TENCEL30*144*80*57 / 58, weave pattern: 3 / 1 twill, Tencel A100 content 68%

[0056] The processing method for improving the formaldehyde content of Tencel A100 fabric includes the following steps:

[0057] Greige fabric → singeing → desizing → scouring → bleaching → stretching → pre-shrinking → rolling.

[0058] 1) Singeing: Vehicle speed: 90m / min, flame intensity: 20mbar.

[0059] 2) Desizing: Desizing enzyme DS-HT: 3g / L, penetrant WA-M: 5g / L, refining enzyme 601L: 1g / L, temperature: 95℃, time: 15min.

[0060] 3) Boiling: NaOH: 20g / L, refining agent CRC: 4g / L, penetrant ZFC-L: 6g / L, chelating agent SQ-A: 4g / L, temperature: 100℃, time: 25min.

[0061] 4) Bleaching: NaClO2: 38g / L, ethanol: 20mL / L, temperature: 104℃, time: 30min.

[0062] 5) Stretching: The bleached fabric is immersed in the following treatment solution, the components of which include: softener SMI-62: 10g / L, softener TUBINGAL PURE: 20g / L, formaldehyde scavenger FDS: 20g / L. The above components are fully dissolved in water and mixed evenly to obtain the treatment solution. The pick-up rate is 65%. Then it is dried. The drying conditions are: 125℃, time 60s.

[0063] 6) Pre-shrinkage: Speed: 50m / min, compression distance: 8mm, rubber blanket temperature: 40℃, felt blanket temperature: 110℃, tension: 4kg.

[0064] 7) The pre-shrinked fabric is rolled up and the free formaldehyde content and the formaldehyde release content after aging for 72 hours are tested.

[0065] Example 4: Fabric specifications: TENCEL30*TENCEL30*144*80*57 / 58, weave pattern: 3 / 1 twill, Tencel A100 content 100%

[0066] The processing method for improving the formaldehyde content of Tencel A100 fabric includes the following steps:

[0067] Greige fabric → singeing → desizing → scouring → bleaching → stretching → pre-shrinking → rolling.

[0068] 1) Singeing: Vehicle speed: 90m / min, flame intensity: 20mbar.

[0069] 2) Desizing: Desizing enzyme DS-HT: 3g / L, penetrant WA-M: 5g / L, refining enzyme 601L: 1g / L, temperature: 95℃, time: 15min.

[0070] 3) Boiling: NaOH: 20g / L, refining agent CRC: 4g / L, penetrant ZFC-L: 6g / L, chelating agent SQ-A: 4g / L, temperature: 100℃, time: 25min.

[0071] 4) Bleaching: NaClO2: 38g / L, ethanol: 20mL / L, temperature: 103℃, time: 25min.

[0072] 5) Stretching: The bleached fabric is immersed in the following treatment solution, the components of which include: softener SMI-62: 20g / L, softener TUBINGAL PURE: 30g / L, formaldehyde scavenger FDS: 30g / L. The above components are fully dissolved in water and mixed evenly to obtain the treatment solution. The pick-up rate is 64%. Then it is dried. The drying conditions are: 130℃, time 50s.

[0073] 6) Pre-shrinkage: Speed: 50m / min, compression distance: 8mm, rubber blanket temperature: 40℃, felt blanket temperature: 110℃, tension: 4kg.

[0074] 7) The pre-shrinked fabric is rolled up and the free formaldehyde content and the formaldehyde release content after aging for 72 hours are tested.

[0075] Comparative Example 1: Based on Example 1, only the amount of ethanol used was changed to 0 mL / L.

[0076] Comparative Example 2: Based on Example 2, only the softener PURE was replaced with softener TranSoft 4911: 40g / L.

[0077] Comparative Example 3: Based on Example 3, only the formaldehyde scavenging agent FDS was removed.

[0078] Comparative Example 4: Based on Example 4, only the bleaching time was changed to 5 seconds.

[0079] The fabrics obtained in Examples 1-4 and Comparative Examples 1-4 were tested for free formaldehyde content and formaldehyde release content after aging for 72 hours, in accordance with GB / T 2912.1-2009 "Textiles - Determination of formaldehyde - Part 1: Free and hydrolyzed formaldehyde (water extraction method)" and GB / T 2912.2-2009 "Textiles - Determination of formaldehyde - Part 2: Released formaldehyde (vapor absorption method)".

[0080] The formaldehyde test results for the fabric are shown in the table below:

[0081] Table 1. Test results for free formaldehyde and released formaldehyde.

[0082]

Claims

1. A processing method for improving the formaldehyde content of Tencel A100 fabric, characterized in that, The process includes the following steps: Greige fabric → singeing → desizing → scouring → bleaching → stretching → pre-shrinking → rolling; The greige fabric contains more than 50% by mass of Tencel A100; The bleaching process involves adding ethanol to the bleaching steam oven; The stretching process involves immersing the bleached fabric in a treatment solution containing: SMI-62 softener (10-40 g / L), TUBINGAL PURE softener (20-40 g / L), and FDS formaldehyde scavenger (20-30 g / L), followed by drying. The bleaching process: Ethanol concentration in the bleaching steam oven: 10~20mL / L, NaClO2: 35~40g / L; The bleaching process: The saturated steam temperature inside the bleaching steam chamber is 102~104℃.

2. The processing method for improving the formaldehyde content of Tencel A100 fabric according to claim 1, characterized in that, The desizing process consists of: desizing enzyme: 2-4 g / L, penetrant: 3-6 g / L, refining enzyme: 1-2 g / L, temperature: 95-98℃, and time: 15-20 min.

3. The processing method for improving the formaldehyde content of Tencel A100 fabric according to claim 1, characterized in that, The boiling process is as follows: NaOH: 10~20g / L, refining agent: 2~4g / L, penetrant: 4~6g / L, chelating agent: 3~5g / L, temperature: 100~102℃, time: 20~25min.

4. The processing method for improving the formaldehyde content of Tencel A100 fabric according to claim 1, characterized in that, The rolling allowance is 60-65%.

5. The processing method for improving the formaldehyde content of Tencel A100 fabric according to claim 1, characterized in that, The drying temperature is 120~130℃ and the time is 30s~60s.

6. The processing method for improving the formaldehyde content of Tencel A100 fabric according to claim 1, characterized in that, The concentration of the ethanol is 95 wt.%.

7. The processing method for improving the formaldehyde content of Tencel A100 fabric according to claim 1, characterized in that, The bleaching process takes 20 to 30 minutes.

Images