Industry standards | Determination of moisture absorption and quick-drying properties of moisture-wicking finishing agents

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009 “Standardization Work Guidelines Part 1: Structure and Preparation of Standards”.

This standard is proposed by China Petroleum and Chemical Industry Federation.

This standard is under the jurisdiction of the Printing and Dyeing Auxiliaries Technical Committee of the National Dyestuff Standardization Technical Committee (SAC/TC134/SC1).

This standard was drafted by: Zhangjiagang Debao Chemical, Zhejiang Sci-Tech University, Zhejiang Chuanhua Co., Ltd.

The main drafters of this standard: Chen Jinhui, Li Yongqiang, Wang Yufei, Shao Jianzhong, Wu Yuchun, Zhao Mei, Liu Jinqiang, Zhao Ting.

Determination of moisture absorption and quick-drying properties of textile dyeing and finishing auxiliaries and moisture-wicking finishing agents

1Scope

This standard specifies the test method for the moisture absorption and quick-drying properties of polyester moisture-wicking finishing agents in textile dyeing and finishing auxiliaries.

This standard is applicable to the determination of moisture absorption and quick-drying properties of polyester moisture-wicking finishing agents in textile dyeing and finishing auxiliaries.

2Normative reference documents

The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 6529 Textiles – Standard atmosphere for humidity conditioning and testing

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 21655.2-2009 Textiles – Evaluation of moisture absorption and quick-drying properties – Part 2: Dynamic moisture transfer method

HG/T 4266-2011 Textile dyeing and finishing auxiliaries – Determination of solid content

3Principles

3.1 Single combination test method

The moisture-absorbing and sweat-wicking finishing agent is applied to the fabric according to certain process conditions, and the hygroscopicity is characterized by the water dripping diffusion time and diffusion area of the fabric after finishing. The shorter the dripping diffusion time and the larger the diffusion area, the greater the moisture absorption and perspiration. The better the hygroscopicity of the finishing agent; after a certain period of time, the moisture residual rate of the finished fabric indicates the quick-drying property. The lower the moisture residual rate, the better the quick-drying property of the corresponding moisture-wicking finishing agent.

3.2 Dynamic moisture transfer method

The moisture-wicking finishing agent is applied to the fabric according to certain process conditions, and the moisture absorption rate of the finished fabric is used to characterize the hygroscopicity. The faster the water absorption rate, the better the hygroscopicity of the corresponding moisture-wicking finishing agent; The water diffusion rate indicates quick-drying properties. The faster the water diffusion rate, the better the quick-drying properties of the corresponding moisture-wicking finishing agent.

4Reagents and materials

Unless otherwise specified, only use reagents confirmed to be of analytical grade and grade three water specified in GB/T6682.

4.1 Fabric: 75D/72F polyester double-sided knitted fabric 140 g/m2, dripping diffusion time greater than 180 s.

4.2 Sodium chloride test solution: 9 g/L, in compliance with GB/T21655.2-2009 regulations.

5Instruments and equipment

Small rolling mill for laboratory;

Small setting machine for laboratory;

Electric blast drying oven: can control temperature from room temperature to 300℃;

Liquid water dynamic transfer performance tester: complies with the relevant provisions of Chapter 5 of GB/T 21655.2-2009;

Liquid water diffusion performance tester: Please refer to Appendix A for the basic structural principles and requirements of the instrument. Any instrument that can achieve the same effect can be used;

Constant temperature and humidity test chamber: It complies with the relevant regulations of GB/T 6529. There is a 12cm experimental test hole on the door panel. Please refer to Appendix B for its structural diagram;

Analytical balance: sensitivity is 0.001 g;

Plexiglas plate: 110 mm×110 mm×5 mm;

Pipette: Accuracy 1 μL;

Timer: division 0.1 s.

6 Finishing of test fabric

6.1 Determination of solid content

The solid content of moisture-absorbing and sweat-wicking finishing agents is measured according to the method specified in HG/T 4266-2011.

6.2 Preparation of working fluid

Convert the moisture-absorbing and sweat-wicking finishing agent to be tested to a solid content of 10% (mass fraction) and prepare a working solution of 20g/L.

6.3 Test fabric processing technology

Finish the test fabric (4.1) with the prepared working solution (6.2), dip and pad it once, with a padding ratio of (70±5)%, dry it at 100°C for 3 minutes, and then set it at 180°C. 60 seconds.

7 Hygroscopicity and quick-drying test

7.1 According to the provisions of GB/T 6529, the cloth sample to be tested (6.3) is equilibrated for 4 hours before testing.

7.2 Determination of dripping water diffusion time and diffusion area

Cut five 150mm×150mm fabric samples from the fabric sample to be tested (6.3). The fabric samples should be flat and wrinkle-free.

Place the cloth sample with the wrong side facing up and flatly fix it to the sample holder of the liquid water diffusion performance tester.

Use a pipette to accurately absorb 0.2 mL of water, turn on the power, and adjust the brightness of the instrument light so that the camera can clearly obtain a picture of the cloth sample.

Press the start button, water will automatically drip on the center of the cloth sample, and start timing. When the water droplets contact the surface of the cloth sample and do not show mirror reflection, record the time t; if the water droplets spread slowly and have not completely spread after 120s, you can Stop the experiment and record the drip diffusion time as greater than 120 s.

When the 120 s timer ends, the instrument automatically captures the water diffusion pattern and transfers the image to the computer.

Use the measurement tool in the software to select the water diffusion pattern in the picture. After the selection is completed, the area value can be read.

Repeat steps 7.2.2 to 7.2.6, test 5 times in parallel, and take the average value.

7.3 Determination of moisture residual rate

Cut five 100mm×100mm fabric samples from the fabric sample to be tested (6.3). The fabric samples should be flat and wrinkle-free.

Place the organic glass plate on the balance and weigh its mass M1 (g).

Use a pipette to accurately transfer 0.2 mL of water droplets to the center of the organic glass plate, and weigh the mass M2 (g) of the water and the organic glass plate.

Immediately cover the back side of the cloth sample to be tested on the water droplet, and weigh the total mass M0 (g) of the organic glass plate, water droplet, and fabric.

Place the organic glass plate and cloth sample together through the experimental test hole into a constant temperature and humidity test chamber with a temperature of (20±2)°C, a humidity of (65±2)%, and a wind speed of (0.2±0.1) m/s, and close the test hole. , start timing.

After 30 minutes, take out the organic glass plate and the cloth sample together, and weigh the total mass M3 (g) of the organic glass plate, residual moisture, and fabric.

Repeat steps 7.3.2 to 7.3.6, test 5 times in parallel, and take the average value.

Calculation of moisture residual rate

The moisture residual rate is measured as the mass fraction Wa of residual moisture, and the value is expressed in %, calculated according to formula (1).

…………………… (1)

In the formula:

M0 – the total mass of the organic glass plate, water droplets and fabric, in grams (g);

M1——The mass of the organic glass plate, in grams (g);

M2 – the mass of the organic glass plate and water droplets, in grams (g);

M3——The total mass of the organic glass plate, residual moisture and fabric after 30 minutes, the unit is (g);

Calculation results are expressed to one decimal place.

7.4 Test of water absorption rate and water diffusion rate

Cut five 90 mm × 90 mm fabric samples from the fabric sample to be tested (6.3). The fabric samples should be flat and wrinkle-free.

Use clean tweezers to gently pick up the corners of the cloth sample to be tested, and place the cloth sample flatly with the reverse side up between the two sensors of the liquid water dynamic transfer performance tester.

Start the instrument, drip (0.2±0.01) g sodium chloride test solution (4.2) into the immersion surface of the fabric within the specified time, and start recording the time and moisture content changes. The test time is 120 s, and the data collection frequency is not less than 10Hz. .

After the test is completed, take out the cloth sample and the instrument will automatically calculate and display the corresponding test results.

Use clean absorbent paper to absorb excess residual liquid on the sensor board. Before testing again, let the instrument stand for at least 60 seconds to ensure that there is no residual liquid on the sensor board.

Repeat steps 7.4.2 to 7.4.5, test 5 times in parallel, and take the average value.

7.5 Result processing

Single combination test method: The shorter the drip diffusion time and the larger the diffusion area, the better the hygroscopicity of the moisture-wicking finishing agent; the smaller the moisture residual rate, the better the quick-drying property of the moisture-wicking finishing agent.

Dynamic moisture transfer method: The faster the water absorption rate is, the better the hygroscopicity of the moisture-wicking finishing agent is; the faster the water diffusion rate is, the better the quick-drying property of the moisture-wicking finishing agent is.

8Test report

The test report should include the following:

a) Description of the sample (additive name, model, batch number, manufacturer information, etc.);

b) The number of this standard;

c) Test results;

d) Differences from this standard;

e) Test date.

Appendix A
(Informative Appendix)
Structural diagram of liquid water diffusion performance tester

A.1 The structural diagram of the liquid water diffusion performance tester is shown in Figure A.1

1——USB computer connection port;

2——Photography device, image sensor: 1/2″ CMOS color; large resolution: 2048 H×1536 V (3 million); image acquisition method: continuous soft trigger, hardware trigger available;

3——Drip device 0.2 mL±0.001 mL, the distance between the drip device and the cloth surface: 1 cm;

4——Rotating device;

5——Sample holder, diameter 120mm;

6——Light source;

7——Control panel: power switch, timing display (timing device: 120 s), reset switch;

8——Light source adjustment;

Figure A.1 Structural diagram of liquid water diffusion performance tester

Appendix B
(Informative Appendix)
Structural diagram of constant temperature and humidity test chamber

1——Transparent glass observation window;

2——Temperature and humidity control panel, temperature control: 20℃±2℃; humidity control: 65%±2%; wind speed control: 0.2m/s±0.1m/s;

3——Experimental test hole diameter 120mm, with rubber plug;

4——Constant temperature and humidity control system;