This standard specifies the method for determining the water repellency of fabrics by the Bondisman rain method. This standard is applicable to the evaluation of the water repellency finishing effect of fabrics subjected to showers in motion. GB/T 14577-1993 Determination of water repellency of fabrics by the Bondisman rain method GB/T14577-1993 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Determination of water repellency of fabrics by the Bundesmaon rain-shower testGH/T 14577--93
This standard is equivalent to the international standard IS09865-1991 & Textiles--Bundesmaon rain-shower test method for determining the water repellency of fabrics\. 1 Subject content and scope of application
This standard specifies the method for determining the water repellency of fabrics by the Bundesmaon rain-shower test method. This standard is applicable to the evaluation of the water repellency finishing effect of fabrics subjected to showers under a moving state. 2 Referenced standards
GB6529 Standard atmosphere for conditioning and testing textiles 3 Definition
Water repellency
The ability of a fabric to resist absorbing rainwater for a specified time under a specified artificial shower. It can also evaluate the water absorption of the fabric and the outflow through the fabric.
4 Principle
The sample is placed on the sample cup and subjected to artificial rain under specified conditions. Then, the water repellency is evaluated by visual comparison with the reference sample and the wet sample. The water absorbed by the sample during the test is weighed and the amount of water collected in the sample cup through the sample is recorded. 5 Equipment and Materials
5.1 The shower instrument consists of a shower, a sample loader and a frame. 5.1.1 The shower consists of about 300 identical drippers, evenly distributed on a plane with a diameter of 406 mm (area ~1 300 cm\).
The surface diameter of the water drop formed by each dripper is about 4 mm. The water droplets overflowing from the dripper are about 0.07 mL. The water flow rate of the shower equipment is adjustable and can be set before the test. The flow rate is 100 ± 5 rnL/min per 100 kcm2 of the showered surface. The distance from the dripper to the center of the sample surface is 1500 mm. The test water passes through a mechanical filter to remove larger impurities. The water temperature should be 20 ± 3 °C. 5.1.2 The sample loader consists of a sample clamp, a sample cup, a wiper, etc. It is a cup-shaped structure that can collect and measure the water that penetrates the sample. 5.1.2.1 The sample clamp is located at the top of the sample loader and consists of a buckle and a sample clamp ring. The sample can be clamped. The sample clamp for thick fabrics should be slightly larger than that for thin fabrics. The exposed surface of the sample after clamping should be 80 cm. 5.1.2.2 The outer diameter of the sample cup is 100 mm, and the center of the cup is inclined at 15° to the vertical line to ensure the flow of water on the surface of the sample. Each sample cup has a 7 ± 1 mm diameter exhaust hole.
5.1.2.3 Each sample cup is attached with a pair of wipers, cross-shaped, during the test, the scraper should be close to the surface of the sample, the force value is about 250cN, 20 times per minute, and the rotation angle is about 100. The cross-shaped scraper arm is 48mm long and about 5mm wide, made of stainless steel, with a polished surface, slightly curved towards the top (radius about 630mm), and the radius of the petal cross section is about 5mm. Approved by the State Administration of Technical Supervision on August 29, 1993, implemented on March 1, 1994
GB/T14577-93
5.1.2.4 When several samples are tested in the same way, the four sample loaders should be evenly arranged in a ring. The same component of the lower sample rack. 1. During the rain test, the sample cup rack rotates around the center of the instrument at 6r/min, so all samples are subjected to consistent rain. 5.2 The centrifuge consists of a 700r/min water sample tray. The sample tray is in the shape of a shield, with a diameter of 175 mm and about 50 ribs arranged radially on the surface. The height is about 1 mm. The ribs are evenly distributed around the sample tray so that the wet sample does not stick to the surface of the tray. 1 spike about 6 mm long is evenly distributed at 60 mm from the center to buckle the half sample. The total weight of the sample tray and the shaft of the counter-connected motor should be 41%. The centrifuge is equipped with a timing device to automatically stop and rotate according to the predetermined period: the time required from starting to 700x/min or from 700r/min to stopping should be 1~~25.
5.3 The reference sample is shown in the figure below.
5.4 A device capable of producing a standard humidity-adjusting atmosphere for textile testing as described in Chapter 6. 5.5 The balance weighs 100g and the sense is 0.01g.
6 Test and humidity-adjusted atmosphere
According to GB6529, the relative humidity is 65%±2%, and the temperature is 20±2℃. 7 Sample preparation
Cut or make 4 flat, wrinkle-free 140mm diameter shaped samples from the sample. Each piece should be more than 100mm away from the edge of the cloth and should be sampled more than 2m away from the end of the cloth. Before the rain test, the sample should be adjusted according to the provisions of Chapter 6: 8 Instrument calibration
Before the test or calibration, the rain meter should be placed for 15m to ensure the consistency of the human body and water temperature, and then measure the amount of water collected in the sample cup. According to the requirements, the rain meter should be set to make each sample cup store 200 lum l of water in 2.5min. During continuous testing, the equipment should be calibrated at least twice a day, and the normal function of the dripper should be checked frequently. 9 Operation procedure
First calibrate the flow rate. When all tests are completed, close the rain shower. Move the rain shield and weigh the mass m of the adjusted sample to an accuracy of 0.01 mm. Identify the test object of the sample and then place it flatly and tension-free on the sample cup. Hold the sample with a suitable sample clamp. Pull open the rain shield and let the sample be rained for 10 minutes.
Use the reference sample (see 5.3) to evaluate the water repellency of the wet sample according to the following 5 levels. Level 5: small water droplets dripping quickly
Level 4: large water droplets formed
Level 3: part of the sample is stained with water droplets wwW.bzxz.Net
Level 2: partly wetted
Level 1: the whole surface is wet
Water repellency can also be evaluated after 1 mirs and 5 mini. Observe the wetness of the sample surface before being showered.
The sample is centrifuged and dehydrated for 15 seconds, and its mass is immediately weighed. The accuracy is 0.01g (if it cannot be weighed immediately after dehydration, it should be weighed in a weighing bottle).
In the rain test, in addition to determining the water absorption of the sample, the water that passes through the sample can also be measured: the water collected in the sample cup is measured in liters. 10 Result expression
Calculate the water absorption rate W as a percentage of mass. The formula is as follows: Level
GB/T 1457793
Wherein: m1
mass of the sample before the test + g,
GB/T 14577—93
Wmm×100
The mass of the sample after the test (i.e. wet), name.
11 Test report
The test report should include the following contents:
List the standard number and year, i.e. GB/T14577—93; Sample specifications and properties:
Instrument model and manufacturer
Water quality used, temperature, hardness, PH;
Sample shower time:
Centrifugal dehydration time!
Number of sample blocks;
Water absorption rate W, expressed as mass percentage, indicating individual values ​​and arithmetic mean, water repellency grade and shower surface:
Spraying time during rating: 1min, 5min or 10min Test 10min Any moisture on the reverse side of the test specimen; if necessary, record the amount of water that penetrates the test specimen in millimeters. And any abnormalities observed on the test specimen before or during the test.
Additional remarks:
This standard is proposed by China National Textile and Apparel Council.
This standard is under the jurisdiction of the Standardization Research Institute of China National Textile and Apparel Council. This standard was drafted by Shanghai Cotton Textile Printing and Dyeing Joint Company, China National Textile and Apparel Council Standardization Research Institute, Shanghai Textile Standards and Metrology Research Institute, and Jiangsu Nonwoven Instrument Factory.
The main drafters of this standard are Xu Jieshou, Qi Yamin, Jing An, Xu Caide, and Min.
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