Textile washing liquid lossless color detection method based on visible light spectrophotometric technology

Abstract

The invention discloses a textile washing liquor lossless color detection method based on a visible spectrophotometric technique, which comprises the following steps: step 1, pretreatment: washing a textile in a certain manner, taking out the textile from washing liquor after the washing is finished, cooling the washing liquor to normal temperature, and then centrifuging and / or filtering; step 2, testing the transmittance: testing the transmittance of the washing liquid pretreated in the step 1 in a visible light spectrum range; 3, calculating a tristimulus value of the lotion; and step 4, converting the tristimulus value of the washing liquid into related parameters through a uniform color space chromatic aberration formula. According to the color detection method, the operation process is simple and efficient, errors caused by personnel differences, detection parameters and the like are greatly reduced, more objective detection of the washing liquid color is achieved, the detected liquid is not damaged, and the color detection method has very important value and significance for subsequent color fastness rating from the quantization angle.

Description

Technical Field

[0001] The invention relates to the field of textile washing liquid detection, and in particular to a non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology. Background Art

[0002] In recent years, with the rapid development of economy and society, consumers not only pursue novel styles and bright colors for textiles, but also have higher requirements for the intrinsic quality of products. Taking common life scenes as an example, when dark clothes and light clothes are mixed together for washing, it is easy to cause the originally light-colored clothes to be stained with the color of dark clothes; some textiles fade seriously after washing, and sometimes even turn into turbid "black water", which makes consumers question the quality of products and cause complaints. In the past, the quality assessment of textiles before and after washing mainly referred to the method mentioned in GB / T 3921-2008 "Textiles Color Fastness Test Color Fastness to Soap Washing". The evaluation effect is also to compare the staining or discoloration of the sewn interlining textiles after soap washing, and does not involve attention to the changes in the washing liquid after soap washing. In recent years, many domestic and foreign brands, traders, etc. have also keenly captured the changes in market demand and began to require the evaluation of the changes in the depth of the residual liquid of textiles after washing, and then comprehensively judge the color fastness performance of textiles together with other indicators.

[0003] In order to improve the overall quality of textile products and help consumers control product quality and safety, in 2017, the China Textile Engineering Society launched the group standard T / CTES 1002-2017 "Textiles - Test for Colour Fastness - Resistance to Staining by Washing Solutions"; subsequently, the textile industry standard FZ / T 73020-2019 "Knitted Casual Wear", revised in 2019, also added the assessment item of "degree of staining by washing solutions"; in 2021, the Zhongshan Textile Engineering Society launched the group standard T / ZSFX 009-2021 "Method for Assessing the Degree of Color Change of Textile Solutions after Washing"; the national standard GB / T 8878-2023 "Cotton Knitted Underwear", revised in 2023, also added a measurement method for "degree of staining by washing solutions"; in 2024, the two national standards GB / T 21295-2024 "Technical Requirements for Physical and Chemical Properties of Clothing" and GB / T 21294-2024 "Test Methods for Physical and Chemical Properties of Clothing" also introduces "color fastness to washing liquid" into the assessment. This shows that China has gradually begun to pay attention to the changes in textile solutions after washing.

[0004] However, the national standards, recommended standards, and group standards mentioned above all use the "visual method", that is, the human eye observes the color change of the solution before and after washing, and then compares it with the gray card mentioned in GB 250 or GB 251, and finally makes a comprehensive judgment and rating of color fastness. Although this method is simple to use, there are many problems. In the study of "Exploring the Factors Affecting the Staining Results of Washing Liquid" by Danping et al., it was found that the key factors affecting the staining degree of washing liquid are the size of the test tube for collecting the filtered sample liquid, the choice of the test method, and the choice of the lining. Although the temperature during rating, the placement time of the sample liquid before rating, the background during rating, and the mesh size of the filter screen have no obvious effect on the final rating results, there are visual differences in the state of the sample liquid under different conditions, which can easily cause deviations in the rating results. Wang Huizhen et al.'s study "A Brief Discussion on the Staining Phenomenon of Several Types of Garments" believes that in addition to the dye itself and the color fixing process, the brushed and velvet treatment, the washing chemicals used, the bath ratio, and the temperature will have an impact on it; Yang Liping et al.'s study "Exploring the Three Factors Affecting the Test of the Degree of Staining of Lotion from the Laboratory Comparison Results" conducted a study from three aspects from the perspective of the laboratory. The results showed that the filtering method had little effect on the results, the distance between the colorimetric tube and the cardboard had a certain effect, and the difference in the eyesight of the personnel had a greater effect; Wang Wendi et al.'s study "A Brief Analysis of the Influencing Factors of the Degree of Staining of Lotion in the Rating Process" showed that the rating angle, rating background, and rating distance all had an impact on the rating process of the staining of lotion. The rating distance had the greatest impact on the test results, with a difference of 1 level, and the farther the rating distance, the lighter the test result; while the rating angle and rating background had relatively little impact on the test results. The experiment showed that when the rating distance changed, the color of the sample liquid was an important reason for the difference in the rating results of the staining of lotion.

[0005] Based on the current research, it can be found that although the visual inspection method is convenient, there are many influencing factors at the subjective and objective levels, which leads to large deviations in the results. Therefore, it is of great significance to establish a method to objectively detect the color of textile detergents, so as to facilitate the subsequent color fastness rating from a quantitative perspective. Summary of the invention

[0006] In order to solve the above technical problems, the purpose of the present invention is to provide a non-destructive color detection method for textile washing liquid based on visible light spectrophotometry technology. The operation process of this color detection method is simple and efficient, which greatly reduces the errors caused by personnel differences, detection parameters, etc., realizes more objective detection of washing liquid color, and does not destroy the detected liquid itself, which is of great value and significance for subsequent color fastness rating from a quantitative perspective.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions: A non-destructive color detection method for textile washing liquid based on visible light spectrophotometry technology comprises the following steps: Step 1, pretreatment: washing the textiles in a certain manner, taking out the textiles from the washing liquid, cooling the washing liquid to room temperature, and then centrifuging and / or filtering; Step 2, testing transmittance: testing the transmittance of the lotion pretreated in step 1 within the visible light spectrum; Step 3, calculating the tristimulus values ​​of the lotion: using the transmittance in the visible light spectrum tested in step 2, according to the relative spectral energy distribution of the standard illuminant at the corresponding wavelength and the spectral tristimulus values ​​of the standard chromaticity observer, calculate the tristimulus values ​​XYZ of the lotion; Step 4: Convert uniform color space color parameters: convert the three stimulus values ​​XYZ of the lotion calculated in step 3 into relevant parameters through the uniform color space color difference formula.

[0008] Wherein, in the step 1, the washing liquid uses water as a solvent, the water quality meets the requirements of GB / T 6682, and the solute uses at least one of water, soap flakes, laundry detergent, laundry powder, and standard detergent; in the test transmittance process of step 2, the washing liquid test temperature is 25-55°C, and the test time is 20-120s.

[0009] Furthermore, in step 1, the centrifugal treatment is carried out at a centrifugal speed of 5000-8000 rpm and for a time of 3-8 min.

[0010] Furthermore, the filtration treatment in step 1 is performed 1-3 times using a sieve and / or filter paper.

[0011] Preferably, during the filtration treatment, the mesh size of the screen is 100-300 meshes; the filter paper uses high-speed filter paper, medium-speed filter paper or low-speed filter paper.

[0012] More preferably, the screens are 150 mesh, 200 mesh, or 250 mesh; and the filter paper is medium-speed qualitative filter paper.

[0013] Furthermore, in the color detection method, the test temperature of the washing liquid with soap flakes as the solute is 35-45°C; the test temperature of the washing liquid with laundry detergent, laundry powder, and standard detergent as the solute is 25-35°C.

[0014] Further, in step 2, the visible light wavelength range for testing transmittance is 380-780nm; Furthermore, the visible light wavelength range for testing transmittance is 400-700nm.

[0015] Furthermore, in step three, when the tristimulus values ​​XYZ are calculated using the CIE1964-XYZ supplementary colorimetry system with a 10° field of view, an integral method or an equal-interval wavelength summation method is used.

[0016] Furthermore, the integral calculation formula of the three stimulus values ​​is: Formula (1); In formula (1): X 10 , Y 10 , Z 10 ---CIE1964-XYZ supplementary colorimetry system color stimulus values; , , ---CIE1964-XYZ supplementary colorimetry system standard colorimetric observer spectrum tristimulus values; S(λ)---Relative spectral power distribution of standard illuminant, refer to GB / T 3978-2008 "Standard illuminants and geometric conditions"; τ(λ)---Spectral transmittance of lotion; κ 10 ---Constant, called normalization coefficient; Indicates wavelength.

[0017] Furthermore, the calculation formula of the equally spaced wavelength summation method is: Formula (2); In formula (2): X 10 , Y 10 , Z 10 ---CIE1964-XYZ supplementary colorimetry system color stimulus values; , , ---CIE1964-XYZ supplementary colorimetry system standard colorimetric observer spectrum tristimulus values; S(λ)---Relative spectral power distribution of standard illuminant, refer to GB / T 3978-2008 "Standard illuminants and geometric conditions"; τ(λ)---Spectral transmittance of lotion; κ 10 ---Constant, called normalization coefficient; Indicates wavelength; Δλ represents the wavelength interval.

[0018] Preferably, in formula (2), Δλ is 1-20 nm.

[0019] More preferably, Δλ is 1 nm, 2 nm, 5 nm or 10 nm.

[0020] Furthermore, in step 4, the uniform color space uses CIE1976L * a * b * Uniform color space, color difference formula uses CIELAB color difference formula to calculate the psychological lightness L of the lotion * Value, psychological chromaticity coordinate a * Value, psychological chromaticity coordinate b * Value, chroma C * ab Value and hue angle h * ab value.

[0021] Furthermore, using CIE1976L * a * b * (CIELAB) color difference formula, converting the three stimulus values ​​XYZ into L * 、a * Value, b * Value, C * ab Value and hue angle h * ab The conversion relationship is as follows: Formula (3); In formula (3), X, Y, and Z are the three stimulus values ​​of the liquid calculated in step 3; X0, Y0, and Z0 are the three stimulus values ​​of a given white object.

[0022] in, , , Should be greater than 0.008856, otherwise it should be calculated according to formula (4): Formula (4).

[0023] The method of the present invention aims at the problems that the current evaluation of the staining degree of textile washing liquid is mainly carried out by human eye observation, and there are many problems such as large individual subjective perception differences and many objective influencing factors. Firstly, the washing liquid of the textile washed in a certain way is pretreated; then the transmittance of the washing liquid in the visible light spectrum is measured; then the three stimulus values ​​of the washing liquid are calculated according to the relative spectral energy distribution of the standard illuminant at the corresponding wavelength and the three stimulus values ​​of the standard colorimetric observer spectrum of the CIE1964-XYZ supplementary colorimetry system; finally, the L value of the sample is calculated according to the CIEL*a*b* uniform color space color CIELAB color difference formula* Value, a * Value, b * Value, chroma C * ab Value and hue angle h * ab The method is simple and efficient in operation, greatly reducing the errors caused by personnel differences and test parameters, and does not damage the tested liquid itself. It is of great value and significance for the subsequent color fastness rating from a quantitative perspective.

[0024] Compared with the existing technology that uses visual inspection as the main evaluation method, the present invention has the following advantages and effects: (1) The present invention creatively combines visible light spectrophotometry technology with textile detergent color detection, which can greatly reduce the evaluation errors caused by subjective factors such as practitioners' experience, emotions, professionalism, workload, etc., as well as various objective factors such as evaluation background, evaluation container, and distance between container and background; (2) The present invention performs certain pretreatment on the washing liquid before testing, and limits a certain test temperature when testing the transmittance, and combines the visible light spectrophotometry technology to ensure the objective accuracy of the test; the present invention does not require destructive treatment of the liquid, and the detection process is carried out in a non-contact and non-destructive manner, thereby ensuring the integrity of the sample; (3) The present invention converts the traditional description of color, which can only be expressed in subjective and general terms such as hue, depth, brightness, etc., into the coordinate values ​​of the CIE uniform color space. The quantitative representation of liquid color characteristics based on the CIE system has better international acceptance. (4) The present invention cooperates with instruments to detect color, which greatly reduces the workload of traditional human eye observation and has higher repeatability and color consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a graph showing the effects of soap solution temperature and filtration on transmittance.

[0026] Figure 2 A table showing the colors converted to chromaticity values ​​compared to the color of the lotion samples. DETAILED DESCRIPTION

[0027] The technical solutions in the present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present invention provides a non-destructive color detection method for textile washing liquid based on visible light spectrophotometry technology, comprising the following steps: Step 1, pretreatment: washing the textiles in a certain manner, taking out the textiles from the washing liquid, cooling the washing liquid to room temperature, and then centrifuging and / or filtering; In step 1, the centrifugal treatment is performed at a centrifugal speed of 5000-8000 rpm for 3-8 min; the filtration treatment is performed 1-3 times using a screen and / or filter paper; the screen has a mesh size of 100-300 meshes; the filter paper uses high-speed filter paper, medium-speed filter paper or low-speed filter paper; further preferably, the screen uses 150 mesh, 200 mesh, 250 mesh, and the filter paper uses medium-speed qualitative filter paper; Step 2, testing transmittance: testing the transmittance of the lotion pretreated in step 1 within the visible light spectrum; the visible light wavelength range for testing transmittance is 380-780nm; more preferably, the visible light wavelength range for testing transmittance is 400-700nm; Step 3, calculating the tristimulus values ​​of the lotion: using the transmittance in the visible light spectrum tested in step 2, according to the relative spectral energy distribution of the standard illuminant at the corresponding wavelength and the spectral tristimulus values ​​of the standard chromaticity observer, calculate the tristimulus values ​​XYZ of the lotion; Step 4: Convert uniform color space color parameters: convert the three stimulus values ​​XYZ of the lotion calculated in step 3 into relevant parameters through the uniform color space color difference formula.

[0029] Wherein, in step 1, the washing liquid uses water as solvent, the water quality meets the requirements of GB / T 6682, and the solute uses at least one of water, soap flakes, laundry detergent, washing powder, and standard detergent; in the test permeability process of step 2, the washing liquid test temperature is 25-55°C, and the test time is 20-120s. Furthermore, the washing liquid using soap flakes as solute has a test temperature of 35-45°C; the washing liquid using laundry detergent, washing powder, and standard detergent as solute has a test temperature of 25-35°C.

[0030] In step 3, when calculating the tristimulus values ​​XYZ using the CIE 1964-XYZ supplementary colorimetry system with a 10° field of view, the integral method or the equal-interval wavelength summation method is used.

[0031] Among them, the integral calculation formula of the three stimulus values ​​is: Formula (1); In formula (1): X 10 , Y 10 , Z 10 ---CIE1964-XYZ supplementary colorimetry system color stimulus values; , , ---CIE1964-XYZ supplementary colorimetry system standard colorimetric observer spectrum tristimulus values; S(λ)---Relative spectral power distribution of standard illuminant, refer to GB / T 3978-2008 "Standard illuminants and geometric conditions"; τ(λ)---Spectral transmittance of lotion; κ 10 ---Constant, called normalization coefficient; Indicates wavelength.

[0032] The calculation formula of the equal-interval wavelength summation method is: Formula (2); In formula (2): X 10 , Y 10 , Z 10 ---CIE1964-XYZ supplementary colorimetry system color stimulus values; , , ---CIE1964-XYZ supplementary colorimetry system standard colorimetric observer spectrum tristimulus values; S(λ)---Relative spectral power distribution of standard illuminant, refer to GB / T 3978-2008 "Standard illuminants and geometric conditions"; τ(λ)---Spectral transmittance of lotion; κ 10 ---Constant, called normalization coefficient; Indicates wavelength; Δλ represents the wavelength interval.

[0033] Preferably, in formula (2), Δλ is 1-20 nm; further preferably, Δλ is 1 nm, 2 nm, 5 nm or 10 nm.

[0034] In step 4, the uniform color space uses CIE1976L * a * b * Uniform color space, color difference formula uses CIELAB color difference formula to calculate the psychological lightness L of the lotion * Value, psychological chromaticity coordinate a * Value, psychological chromaticity coordinate b * Value, chroma C * ab Value and hue angle h* ab value.

[0035] Using CIE1976L * a * b * (CIELAB) color difference formula, converting the three stimulus values ​​XYZ into L * 、a * Value, b * Value, C * ab Value and hue angle h * ab The conversion relationship is as follows: Formula (3); In formula (3), X, Y, and Z are the three stimulus values ​​of the liquid calculated in step 3; X0, Y0, and Z0 are the three stimulus values ​​of a given white object.

[0036] in, , , Should be greater than 0.008856, otherwise it should be calculated according to formula (4): Formula (4).

[0037] Example 1 (1) Preprocessing Prepare 5g / L soap solution. The water used for the soap solution should be water that meets the requirements of GB / T 6682. Then use qualitative medium-speed filter paper to filter once.

[0038] (2) Test transmittance The wash solution pretreated in step (1) was tested for its spectral transmittance τ(λ) at wavelengths of 400-700 nm at 45°C using a Datacolor 850 precision desktop colorimeter (Datacolor Trading (Shanghai) Co., Ltd.) under a D65 light source and a 10° field of view.

[0039] (3) Calculation of tristimulus values The spectral transmittance τ(λ) measured in step (2) is calculated according to the observer spectral tristimulus values ​​of the D65 light source with a 10° viewing field in the CIE1964-XYZ supplementary colorimetric system. , , , and the relative spectral power distribution S(λ) of the D65 light source standard illuminant, using the equal-interval wavelength method, where the wavelength interval Δλ=10nm, the CIE1964-XYZ complementary colorimetric system tristimulus value X of the lotion is calculated using formula (2): 10 , Y 10 , Z 10; In formula (2), ; (4) Convert to color space parameters The CIE1964-XYZ supplementary colorimetric system tristimulus value X of the lotion calculated in step (3) is 10 , Y 10 , Z 10 , through CIE1976L * a * b * Uniform color space, using CIE1976L mentioned in formula (3) * a * b * (CIELAB) color difference formula, X 10 , Y 10 , Z 10 Convert to L * 、a * Value, b * Value, C * ab Value and hue angle h * ab value.

[0040] Example 2 (1) Preprocessing Prepare 5g / L soap solution, the water used for the soap solution should be water that meets the requirements of GB / T 6682, and then filter once using a 150-mesh sieve.

[0041] (2) Test transmittance The wash solution pretreated in step (1) was tested for its spectral transmittance τ(λ) at wavelengths of 400-700 nm at 35°C using a Datacolor 850 precision desktop colorimeter (Datacolor Trading (Shanghai) Co., Ltd.) under a D65 light source and a 10° field of view.

[0042] (3) Calculation of tristimulus values The spectral transmittance τ(λ) measured in step (2) is calculated according to the observer spectral tristimulus values ​​of the D65 light source with a 10° viewing field in the CIE1964-XYZ supplementary colorimetric system. , , , and the relative spectral power distribution S(λ) of the D65 light source standard illuminant, using the equal-interval wavelength method, where the wavelength interval Δλ=10nm, the CIE1964-XYZ complementary colorimetric system tristimulus value X of the lotion is calculated using formula (2): 10 , Y 10 , Z 10 .

[0043] In formula (2), .

[0044] (4) Convert into color space parameters.

[0045] The CIE1964-XYZ supplementary colorimetric system tristimulus value X of the lotion calculated in step (3) is 10 , Y 10 , Z 10 , through CIE1976L * a * b * Uniform color space, using CIE1976L mentioned in formula (3) * a * b * (CIELAB) color difference formula, X 10 , Y 10 , Z 10 Convert to L * 、a * Value, b * Value, C * ab Value and hue angle h * ab value.

[0046] Example 3 (1) Preprocessing Prepare a soap solution containing 5g / L soap and 2g / L sodium carbonate. The water used for the soap solution is water that meets the requirements of GB / T 6682. Then use a centrifuge to centrifuge at 8000rpm for 5 minutes, and then filter once with qualitative medium-speed filter paper.

[0047] (2) Test transmittance The wash solution pretreated in step (1) was tested for its spectral transmittance τ(λ) at wavelengths of 400-700 nm at 40°C using a Datacolor 850 precision desktop colorimeter (Datacolor Trading (Shanghai) Co., Ltd.) under a D65 light source and a 10° field of view.

[0048] (3) Calculation of tristimulus values The spectral transmittance τ(λ) measured in step (2) is calculated according to the observer spectral tristimulus values ​​of the D65 light source with a 10° viewing field in the CIE1964-XYZ supplementary colorimetric system. , , , and the relative spectral power distribution S(λ) of the D65 light source standard illuminant, using the equal-interval wavelength method, where the wavelength interval Δλ=10nm, the CIE1964-XYZ complementary colorimetric system tristimulus value X of the lotion is calculated using formula (2):10 , Y 10 , Z 10 ; In formula (2), ; (4) Convert to color space parameters The CIE1964-XYZ supplementary colorimetric system tristimulus value X of the lotion calculated in step (3) is 10 , Y 10 , Z 10 , through CIE1976L * a * b * Uniform color space, using CIE1976L mentioned in formula (3) * a * b * (CIELAB) color difference formula, X 10 , Y 10 , Z 10 Convert to L * 、a * Value, b * Value, C * ab Value and hue angle h * ab value.

[0049] Example 4

[0050] (1) Preprocessing A piece of PA66 fabric dyed with a black acid dye was selected, and soap-washed using the soap solution prepared in Example 1 according to the test condition A of GB / T 3921 "Textiles - Tests for Colour Fastness - Colour Fastness to Soaping"; after the soap-washing, the fabric was taken out, and the soap-washing solution was filtered once using a qualitative medium-speed filter paper.

[0051] (2) Test transmittance The wash solution pretreated in step (1) was tested for its spectral transmittance τ(λ) at wavelengths of 400-700 nm at 40°C using a Datacolor 850 precision desktop colorimeter (Datacolor Trading (Shanghai) Co., Ltd.) under a D65 light source and a 10° field of view.

[0052] (3) Calculation of tristimulus values The spectral transmittance τ(λ) measured in step (2) is calculated according to the observer spectral tristimulus values ​​of the D65 light source with a 10° viewing field in the CIE1964-XYZ supplementary colorimetric system. , , , and the relative spectral power distribution S(λ) of the D65 light source standard illuminant, using the equal-interval wavelength method, where the wavelength interval Δλ=10nm, the CIE1964-XYZ complementary colorimetric system tristimulus value X of the lotion is calculated using formula (2): 10 , Y 10 , Z 10 ; In formula (2), ; (4) Convert to color space parameters The CIE1964-XYZ supplementary colorimetric system tristimulus value X of the lotion calculated in step (3) is 10 , Y 10 , Z 10 , through CIE1976L * a * b * Uniform color space, using CIE1976L mentioned in formula (3) * a * b * (CIELAB) color difference formula, X 10 , Y 10 , Z 10 Convert to L * 、a * Value, b * Value, C * ab Value and hue angle h * ab value.

[0053] Example 5 (1) Preprocessing A piece of gray disperse dyed 300T polyester pongee fabric was selected, and soaped with the soap solution prepared in Example 1 according to GB / T 3921 "Textiles - Colour Fastness - Tests for Colour Fastness to Washing with Soap" under test condition A; after the soaping, the fabric was taken out, and the soaping solution was filtered once using qualitative medium-speed filter paper.

[0054] (2) Test transmittance The wash solution pretreated in step (1) was tested for its spectral transmittance τ(λ) at wavelengths of 400-700 nm at 40°C using a Datacolor 850 precision desktop colorimeter (Datacolor Trading (Shanghai) Co., Ltd.) under a D65 light source and a 10° field of view.

[0055] (3) Calculation of tristimulus values The spectral transmittance τ(λ) measured in step (2) is calculated according to the observer spectral tristimulus values ​​of the D65 light source with a 10° viewing field in the CIE1964-XYZ supplementary colorimetric system. , , , and the relative spectral power distribution S(λ) of the D65 light source standard illuminant, using the equal-interval wavelength method, where the wavelength interval Δλ=10nm, the CIE1964-XYZ complementary colorimetric system tristimulus value X of the lotion is calculated using formula (2): 10 , Y 10 , Z 10 ; In formula (2), ; (4) Convert to color space parameters The CIE1964-XYZ supplementary colorimetric system tristimulus value X of the lotion calculated in step (3) is 10 , Y 10 , Z 10 , through CIE1976L * a * b * Uniform color space, using CIE1976L mentioned in formula (3) * a * b * (CIELAB) color difference formula, X 10 , Y 10 , Z 10 Convert to L * 、a * Value, b * Value, C * ab Value and hue angle h * ab value.

[0056] Example 6 (1) Preprocessing A piece of modified polyester fabric dyed with a rose-red cationic dye was selected, and soap-washed using the soap solution prepared in Example 1 according to GB / T 3921 "Textiles - Colour Fastness - Tests for Colour Fastness to Washing" under test condition A; after the soap-washing, the fabric was taken out, and the soap-washing solution was filtered once using a qualitative medium-speed filter paper.

[0057] (2) Test transmittance The wash solution pretreated in step (1) was tested for its spectral transmittance τ(λ) at wavelengths of 400-700 nm at 40°C using a Datacolor 850 precision desktop colorimeter (Datacolor Trading (Shanghai) Co., Ltd.) under a D65 light source and a 10° field of view.

[0058] (3) Calculation of tristimulus values The spectral transmittance τ(λ) measured in step (2) is calculated according to the observer spectral tristimulus values ​​of the D65 light source with a 10° viewing field in the CIE1964-XYZ supplementary colorimetric system. , , , and the relative spectral power distribution S(λ) of the D65 light source standard illuminant, using the equal-interval wavelength method, where the wavelength interval Δλ=10nm, the CIE1964-XYZ complementary colorimetric system tristimulus value X of the lotion is calculated using formula (2): 10 , Y 10 , Z 10 ; In formula (2), ; (4) Convert to color space parameters The CIE1964-XYZ supplementary colorimetric system tristimulus value X of the lotion calculated in step (3) is 10 , Y 10 , Z 10 , through CIE1976L * a * b * Uniform color space, using CIE1976L mentioned in formula (3) * a * b * (CIELAB) color difference formula, X 10 , Y 10 , Z 10 Convert to L * 、a * Value, b * Value, C * ab Value and hue angle h * ab value.

[0059] Comparative Example 1 Keeping the other conditions consistent with those in Example 1, the temperature in step (2) was maintained at 30°C.

[0060] Comparative Example 2 Keeping the other conditions consistent with those in Example 1, the temperature in step (2) was maintained at 27°C.

[0061] Comparative Example 3 The other conditions were kept consistent with those in Example 1, except that the temperature in step (2) was maintained at 27° C. and no filtration was performed.

[0062] Comparative Example 4 The other conditions are the same as those in Example 2, except that tap water is used instead of water with water quality meeting the requirements of GB / T 6682.

[0063] test (1) Transmittance The transmittance of the liquids in the above embodiments and comparative examples was tested using Datacolor 850.

[0064] (2) Color consistency Find 5 adult males and females between 18 and 30 years old and judge the CIE1976L measured by the method of the present invention. * a * b * The color in the uniform color space is consistent with the actual color of the lotion. Five people independently judged without interference from other conditions. The evaluation was divided into four levels: "1. Consistent, 2. Inconspicuous difference, 3. Obvious difference, 4. Completely inconsistent".

[0065] The results of the effects of soap solution temperature and water quality on the color difference of textiles are shown in Table 1.

[0066] Table 1 Effects of soap temperature and water quality on color difference of textiles

[0067] Figure 1 This is the effect of soap solution temperature and filtration on transmittance; Figure 2 A table showing the color converted into chromaticity values ​​and the color comparison of the lotion sample; Figure 2 Among them, Examples 1-3 are transparent.

[0068] Combining the above Table 1 Figure 1 It can be seen that when the temperature of the liquid in Examples 1-3 is 55°C, 45°C, and 35°C, the solution is clear and its spectral transmittance at 400-700nm is high; when the temperature of Comparative Example 1 drops to 30°C, its solution begins to become turbid and misty, and the permeability of the liquid also begins to decrease; and when the temperature continues to drop to room temperature, the washing liquid in Comparative Example 2 begins to become more turbid and misty, and its spectral transmittance changes from Figure 1 It can be clearly seen that the decrease is very obvious. The difference between Comparative Example 3 and Comparative Example 2 is that at this temperature, Comparative Example 2 was filtered, while Comparative Example 3 was not filtered, so its transmittance is lower. The reason is directly related to the soap flakes in the soap solution causing the entire solution to be turbid. Comparative Example 4 explores the effect of water quality on the state of the washing liquid. From the results, it can be seen that compared with water that meets GB / T 6682, directly using tap water, the originally clear soap solution also begins to become turbid, that is, water quality will have a great impact on the transmittance. Therefore, it can be considered that the temperature, filtration, and water quality of the solution have an important impact on the color test of the liquid.

[0069] Figure 2The table in the figure is about the comparison between the color converted into chromaticity value by the method of the present invention and the color of the lotion sample. It can be seen from Examples 1-3 that at this time, in the chromaticity value of CIE1976L*a*b* uniform color space, it is also displayed as a transparent state, which is consistent with the actual state of the liquid. Examples 4-6 respectively selected three colored liquids for testing, namely black, gray, and rose red, and the tristimulus values ​​XYZ converted by the method of the present invention were converted into 5 groups of chromaticity values ​​L * 、a * Value, b * Value, C * ab Value and hue angle h * ab The value was evaluated in parallel by 5 groups of people and it was found that it was consistent with the color of the actual liquid. This proves that this method can be used to characterize the color of liquid.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0071] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A non-destructive color detection method for textile washing liquid based on visible light spectrophotometry technology, characterized in that: The steps include: Step 1, pretreatment: washing the textiles in a certain manner, taking out the textiles from the washing liquid, cooling the washing liquid to room temperature, and then centrifuging and / or filtering; Step 2, testing transmittance: testing the transmittance of the lotion pretreated in step 1 within the visible light spectrum; Step 3, calculating the tristimulus values ​​of the lotion: using the transmittance in the visible light spectrum tested in step 2, according to the relative spectral energy distribution of the standard illuminant at the corresponding wavelength and the spectral tristimulus values ​​of the standard chromaticity observer, calculate the tristimulus values ​​XYZ of the lotion; Step 4: Convert uniform color space color parameters: convert the three stimulus values ​​XYZ of the lotion calculated in step 3 into relevant parameters through the uniform color space color difference formula.

2. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 1 is characterized in that: In the step 1, the washing liquid uses water as a solvent, the water quality meets the requirements of GB / T 6682, and the solute uses at least one of water, soap flakes, laundry detergent, laundry powder, and standard detergent; in the test permeability process of step 2, the washing liquid test temperature is 25-55° C., and the test time is 20-120s.

3. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 1 is characterized in that: In step 1, the centrifugal treatment is performed at a speed of 5000-8000 rpm for 3-8 min.

4. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 1 is characterized in that: The filtration treatment in step 1 is performed 1-3 times using a mesh and / or filter paper.

5. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 4 is characterized in that: The mesh number of the screen is 100-300 meshes; the filter paper uses high-speed filter paper, medium-speed filter paper or low-speed filter paper.

6. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 1 is characterized in that: For washing liquid with soap flakes as solute, the test temperature is 35-45℃; for washing liquid, washing powder and standard detergent as solute, the test temperature is 25-35℃.

7. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 1 is characterized in that: In step 3, when calculating the tristimulus values ​​XYZ using the CIE1964-XYZ supplementary colorimetry system with a 10° field of view, the integral method or the equal-interval wavelength summation method is used.

8. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 7 is characterized in that: When the equally spaced wavelength summation method is used, the wavelength interval Δλ is 1-20 nm.

9. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 8, characterized in that: Δλ is 1 nm, 2 nm, 5 nm or 10 nm.

10. The non-destructive color detection method of textile washing liquid based on visible light spectrophotometry technology according to claim 1, characterized in that: In step 4, the uniform color space uses CIE1976L * a * b * Uniform color space, color difference formula uses CIELAB color difference formula to calculate the psychological lightness L of the lotion * Value, psychological chromaticity coordinate a * Value, psychological chromaticity coordinate b * Value, chroma C * ab Value and hue angle h * ab value.

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