WO2012130006A1

WO2012130006A1 - Method and system for measuring formaldehyde content in fabrics

Info

Publication number: WO2012130006A1
Application number: PCT/CN2012/071591
Authority: WO
Inventors: 胡金莲; 张华林; 沈陈炎; 杨立仁; 朱勇
Original assignee: 香港纺织及成衣研发中心有限公司
Priority date: 2011-03-31
Filing date: 2012-02-24
Publication date: 2012-10-04
Also published as: CN102735717B; CN102735717A

Abstract

A method and a system for measuring formaldehyde content in fabrics; the method comprising the steps of: S1, an airtight container receives formaldehyde diffused from the surface of a fabric, and a formaldehyde response module absorbs and consumes formaldehyde in the airtight container; S2, the formaldehyde response module converts the formaldehyde concentration information in the airtight container to an electrical signal; and, S3, converting the electrical signal to the content of formaldehyde in the fabric based on the electrical signal and a conversion database. The method and system for measuring formaldehyde content in fabrics do not use optical means, has short measuring time, the measuring method is simple, and no consumables or reagents are required for performing the measurement.

Description

Method and system for measuring formaldehyde content of fabric

Technical field

This invention relates to the field of measurement and, more particularly, to a method and system for measuring formaldehyde content in fabrics.

Background technique

At present, home furniture, kitchen furniture, office appliances, fast construction, moving slabs, beams or other components are all disassembled. This detachable structure saves packaging space, facilitates transportation and saves freight. In the prior art, such structures mainly connect various types of plates by external forces such as screws, hinges, glues, metal connectors, and fasteners. However, after assembly, when the whole is moved, the interconnection between the components is not strong and easily deformed or scattered, which causes trouble to the user, and there is a hidden danger that the installation is not performed. Therefore, it is necessary to ensure the locking of the joints between the components to prevent accidental loose shelves from occurring.

Because formaldehyde is a harmful gas, it is essential to measure the concentration of formaldehyde in people's daily activities. Many cities and organizations legislate to regulate or recommend the maximum formaldehyde content of items that people can access and the acceptable levels of formaldehyde in closed spaces such as shopping malls, homes, and offices.

There are generally two methods for measuring formaldehyde concentration: the closed box method and the extraction method. In the closed box method, described in ISO 15234 (paint and varnish - formaldehyde coating and melamine coating test - determination of formaldehyde concentration in small laboratories), a closed box covering the material being tested This method measures the formaldehyde emitted by the material under test under a controlled air flow, and then the gas stream dissolves the formaldehyde in water through an absorbable material, and finally measures the concentration of formaldehyde in the water using a photometric method of adding a special reagent. The reagents used are generally acetylacetone mixed with ammonium salts and acetic acid. In the extraction method, water or water vapor is used to extract formaldehyde in the test material, and the test material is placed in the water or water surface of a closed container having a certain temperature for a prescribed time, and then the formaldehyde concentration in the water is measured by the same photometric method. The specific method of the water extraction method is described in ISO 14184-1 (Determination of Textiles - Formaldehyde - Part 1 - Free Hydrolyzed Formaldehyde (Water Extraction Method)). A specific method of steam extraction is described in ISO 14184-2 (Determining Formaldehyde - Part 2 - Free Formaldehyde (Vapor Extraction)). The above measurement methods are very time consuming, and the samples are generally placed for 30 minutes to 20 hours. In addition, these measurement methods require the use of a spectrometer and corresponding reagents.

Some existing inventions have also made improvements in methods for measuring the formaldehyde content and concentration of articles. However, these improvements are all based on optical methods for measuring formaldehyde concentration, which is time consuming, inconvenient, and costly.

Summary of the invention

The technical problem to be solved by the present invention is that the existing method and system for measuring the formaldehyde content of the fabric adopts an optical method, which is time-consuming, inconvenient, and costly, and provides a formaldehyde for the container by setting a conversion database. The method and system for measuring the formaldehyde content of a fabric by converting the concentration into a formaldehyde content of the fabric, the method and the system do not use an optical method, the test time is short, the test method is simple, and no consumables or reagents are used for measurement.

The technical solution adopted by the present invention to solve the technical problem is: constructing a method for measuring the formaldehyde content of the fabric, comprising the steps of: S1: the closed container receives the formaldehyde emitted from the surface of the fabric, and the formaldehyde response module absorbs and consumes the sealed container. Formaldehyde; S2, the formaldehyde response module converts formaldehyde concentration information in the closed container into an electrical signal; S3, converting the electrical signal into a formaldehyde content of the fabric according to the electrical signal and the conversion database.

In the method of measuring the formaldehyde content of a fabric according to the present invention, the conversion database is determined by a standard test method according to ISO 14184-1, the structure of the corresponding fabric, and a pre-drawn curve of the weight of the corresponding fabric.

In the method for measuring the formaldehyde content of the fabric according to the present invention, the method for measuring the formaldehyde content of the fabric further comprises the step of: S4, correcting the conversion result of the step S3 according to the temperature at the time of the test.

In the method for measuring the formaldehyde content of a fabric according to the present invention, the method for measuring the formaldehyde content of the fabric further comprises the step of: S5, interacting with the system for measuring the formaldehyde content of the fabric through the input module and the display module.

In the method of measuring formaldehyde content of a fabric according to the present invention, the formaldehyde response module includes a molecular imprinting polymer that detects formaldehyde concentration information and an electrochemical conversion device that converts the formaldehyde concentration information into an electrical signal.

The invention also relates to a system for measuring the formaldehyde content of a fabric, comprising a closed container for receiving formaldehyde emitted from a surface of the fabric; a formaldehyde response module for absorbing and consuming formaldehyde in the closed container, and the sealed container The formaldehyde concentration information is converted into an electrical signal; and a conversion module is configured to convert the electrical signal into a formaldehyde content of the fabric based on the electrical signal and the conversion database.

In the system for measuring the formaldehyde content of a fabric according to the present invention, the conversion database is determined by a pre-rendered curve according to the standard test method of ISO 14184-1, the structure of the corresponding fabric, and the weight of the corresponding fabric.

In the system for measuring the formaldehyde content of the fabric according to the present invention, the system for measuring the formaldehyde content of the fabric further comprises: a correction module for correcting the conversion result of the conversion module according to the temperature at the time of the test.

In the system for measuring formaldehyde content of a fabric according to the present invention, the system for measuring formaldehyde content of a fabric further comprises: an input module: for an operator to input an interactive command; and a display module for displaying the detection result.

In the system for measuring formaldehyde content of a fabric according to the present invention, the formaldehyde response module includes a molecular imprinting polymer that detects formaldehyde concentration information and an electrochemical conversion device that converts the formaldehyde concentration information into an electrical signal.

The method and system for measuring the formaldehyde content of the fabric of the invention have the following beneficial effects: no optical method, short test time, simple test method, no need to use any consumables or reagents for measurement, avoiding the original measurement fabric The method and system for formaldehyde content are optical methods that are time consuming, inconvenient, and costly.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Figure 1 is a flow chart of a first preferred embodiment of the method of measuring formaldehyde content of a fabric of the present invention;

Figure 2 is a flow chart of a second preferred embodiment of the method of measuring formaldehyde content of a fabric of the present invention;

Figure 3 is a flow chart of a third preferred embodiment of the method of measuring formaldehyde content of a fabric of the present invention;

Figure 4 is a schematic view showing the structure of a first preferred embodiment of the system for measuring formaldehyde content of a fabric of the present invention;

Figure 5 is a schematic view showing the structure of a second preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention;

Figure 6 is a schematic view showing the structure of a third preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention;

Figure 7 is a schematic view showing the specific structure of a preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention;

Figure 8 is a related comparative measurement chart of test results of a preferred embodiment of the system for measuring formaldehyde content of the present invention and test data according to the standard test method of ISO 14184-1;

Figure 9 is a reproducibility test chart of a preferred embodiment of the system for measuring formaldehyde content of a fabric of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the flow chart of the first preferred embodiment of the method of measuring the formaldehyde content of the fabric of the present invention shown in Figure 1, the method of measuring the formaldehyde content of the fabric begins in step 100, followed by:

Step 101, the closed container 1 receives the formaldehyde emitted from the surface of the fabric, and the formaldehyde response module 2 absorbs and consumes the formaldehyde in the closed container 1;

Step 102, the formaldehyde response module 2 converts the formaldehyde concentration information in the closed container 1 into an electrical signal;

Step 103, converting the electrical signal into a formaldehyde content of the fabric according to the electrical signal and the conversion database 4;

Finally, the method of measuring the formaldehyde content of the fabric ends at step 104.

When the method is used, a system for measuring the formaldehyde content of the fabric is placed on the surface of the test fabric, and the closed container 1 is opened downward to form a closed space with the surface of the test fabric, so that the formaldehyde emitted from the surface of the fabric can be restricted in the closed space. A formaldehyde response module 2 is disposed in the confined space, and the formaldehyde response module 2 absorbs and depletes the formaldehyde concentration in the formaldehyde measurement space in the confined space and converts it into an electrical signal, and the formaldehyde and formaldehyde emitted on the surface of the fabric respond to the formaldehyde consumed by the module 2. When equilibrium is reached (after about 3-10 minutes), the operator can read the value of the formaldehyde content converted to the fabric by the corresponding relationship in the conversion database 4. The method for measuring the formaldehyde content of the fabric of the invention converts the formaldehyde concentration of the container into the formaldehyde content of the fabric by setting a standard conversion database 4 instead of the conventional optical method, the test time is short, the test method is simple, and no consumables are needed or The reagent is measured.

In the flow chart of the second preferred embodiment of the method of measuring the formaldehyde content of the fabric of the present invention shown in Figure 2, the method of measuring the formaldehyde content of the fabric begins in step 200, followed by:

Step 201, the closed container 1 receives the formaldehyde emitted from the surface of the fabric, and the formaldehyde response module 2 absorbs and consumes the formaldehyde in the closed container 1;

Step 202, the formaldehyde response module 2 converts the formaldehyde concentration information in the closed container 1 into an electrical signal;

Step 203, converting the electrical signal into a formaldehyde content of the fabric according to the electrical signal and the conversion database 4;

Step 204, correcting the conversion result of the step 203 according to the temperature at the time of testing;

Finally, the method of measuring the formaldehyde content of the fabric ends in step 205.

The ambient temperature during the test has a great influence on the formaldehyde emission on the fabric surface. For example, the higher the temperature, the faster the diffusion rate of formaldehyde, and the amount of formaldehyde consumed by the formaldehyde response module for 2 units is fixed. Therefore, a calibration module 5 for measuring the ambient temperature is used to correct the conversion result of the step 203 according to the ambient temperature at the time of the test, so that the formaldehyde content of the finally measured fabric is more accurate.

In the flow chart of the third preferred embodiment of the method of measuring formaldehyde content of the fabric of the present invention shown in Figure 3, the method of measuring the formaldehyde content of the fabric begins in step 300, followed by:

Step 301, the closed container 1 receives the formaldehyde emitted from the surface of the fabric, and the formaldehyde response module 2 absorbs and consumes the formaldehyde in the sealed container 1;

Step 302, the formaldehyde response module 2 converts the formaldehyde concentration information in the closed container 1 into an electrical signal;

Step 303, converting the electrical signal into a formaldehyde content of the fabric according to the electrical signal and the conversion database 4;

Step 304, correcting the conversion result of the step 303 according to the temperature at the test;

Step 305, the operator and the system for measuring the formaldehyde content of the fabric are interacted by the input module 6 and the display module 7;

Finally, the method of measuring the formaldehyde content of the fabric ends at step 306.

The settings of the input module 6 and the display module 7 enable the operator to perform real-time measurement and on-line control of the formaldehyde emitted on the surface of the fabric to achieve better monitoring of the amount of formaldehyde emitted from the surface of the fabric.

As a preferred embodiment of the method of the present invention for measuring the formaldehyde content of a fabric, the conversion database 4 is determined by a standard test method according to ISO 14184-1, the structure of the corresponding fabric, and a pre-drawn curve of the weight of the corresponding fabric. The operator presets the first-order or second-order linear relationship (curve) of the relevant data obtained in the international standard formaldehyde test method ISO14184-1 and the electrical signal converted by the formaldehyde response module 2 in the conversion database 4, and is measured according to the measurement. The different fabric structures and different fabric weights are modified to match the curves in the conversion database to match the characteristics of different fabrics that emit formaldehyde. After the curve is prepared in advance, the corresponding curve can be used to calculate the formaldehyde content of the fabric in actual use. Therefore, the method can be used without the traditional optical method, the test time is short, the test is simple, and no consumables are needed or The reagent is measured.

As a preferred embodiment of the method for measuring formaldehyde content of a fabric of the present invention, the formaldehyde response module 2 includes a molecular imprinting polymer for detecting formaldehyde concentration information and an electrochemical conversion device for converting the formaldehyde concentration information into an electrical signal. The formaldehyde response module 2 can statically detect the concentration of formaldehyde in the closed container 1, and does not need to use any auxiliary equipment such as a pump for air pumping as in the prior art, so that the test cost of the method for measuring the formaldehyde content of the fabric of the present invention is more low.

The invention also relates to a system for measuring the formaldehyde content of a fabric. In the structural schematic diagram of the first preferred embodiment of the system for measuring formaldehyde content of the fabric shown in FIG. 4, the system comprises a closed container 1 and a formaldehyde response module 2 And a conversion module 3, the sealed container 1 is configured to receive formaldehyde emitted from the surface of the fabric; the formaldehyde response module 2 is configured to absorb and consume formaldehyde in the sealed container 1, and convert the formaldehyde concentration information in the sealed container 1 into an electrical signal. The conversion module 3 is adapted to convert the electrical signal into a formaldehyde content of the fabric based on the electrical signal and the conversion database 4. When the system is used, the system is placed on the surface of the test fabric, and the closed container 1 is opened downward to form a closed space with the surface of the test fabric, so that the formaldehyde emitted from the surface of the fabric can be restricted in the closed space. A formaldehyde response module 2 is disposed in the confined space, and the formaldehyde response module 2 absorbs and decomposes the formaldehyde concentration in the formaldehyde measurement space in the space and converts it into an electrical signal, and the formaldehyde and the formaldehyde generated by the surface of the fabric respond to the formaldehyde consumed by the module 2 At equilibrium (after about 3-10 minutes), the operator can read the value of the formaldehyde content converted to the fabric by the corresponding relationship in the conversion database 4. The system for measuring the formaldehyde content of the fabric of the present invention converts the formaldehyde concentration of the container into the formaldehyde content of the fabric by setting a standard conversion database 4 instead of the conventional optical method, the test time is short, the test method is simple, and no consumables are used or The reagent is measured.

In the structural schematic diagram of the second preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention shown in FIG. 5, the system for measuring the formaldehyde content of the fabric further comprises a correction module 5 for using the temperature according to the test. The conversion result of the conversion module 3 is corrected. The ambient temperature during the test has a great influence on the formaldehyde emission on the fabric surface. For example, the higher the temperature, the faster the diffusion rate of formaldehyde, and the amount of formaldehyde consumed by the formaldehyde response module for 2 units is fixed. Therefore, a calibration module 5 for measuring the ambient temperature is used to correct the conversion result of the conversion module 3 according to the ambient temperature at the time of testing, so that the formaldehyde content of the finally measured fabric is more accurate.

In the structural schematic view of the third preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention shown in FIG. 6, the system for measuring the formaldehyde content of the fabric further comprises an input module 6 and a display module 7. The input module 6 is for an operator to input an interactive command, and the display module 7 is for displaying a detection result. The settings of the input module 6 and the display module 7 enable the operator to perform real-time measurement and on-line control of the formaldehyde emitted on the surface of the fabric to achieve better monitoring of the amount of formaldehyde emitted from the surface of the fabric.

As a preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention, the conversion database 4 is determined by a pre-rendered curve according to the standard test method of ISO 14184-1, the structure of the corresponding fabric, and the weight of the corresponding fabric. The operator presets the first-order or second-order linear relationship (curve) of the relevant data obtained in the international standard formaldehyde test method ISO14184-1 and the electrical signal converted by the formaldehyde response module 2 in the conversion database 4, and is measured according to the measurement. The different fabric structures and different fabric weights are modified to match the curves in the conversion database to match the characteristics of different fabrics that emit formaldehyde. After the curve is prepared in advance, the corresponding curve can be used to calculate the formaldehyde content of the fabric in actual use. Therefore, the system can be used without the traditional optical method, the test time is short, the test is simple, and no consumables or reagents are needed. Make measurements.

As a preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention, the formaldehyde response module 2 includes a molecular imprinting polymer for detecting formaldehyde concentration information and an electrochemical conversion device for converting the formaldehyde concentration information into an electrical signal. The formaldehyde response module 2 can statically detect the concentration of formaldehyde in the closed container 1, and does not need to use any auxiliary equipment such as an air pump such as a pump as in the prior art, so that the test cost of the system for measuring the formaldehyde content of the fabric of the present invention is more low.

The specific working flow of the system for measuring the formaldehyde content of the fabric of the present invention is illustrated by the specific structural diagram of the preferred embodiment of the system for measuring formaldehyde content of the fabric of the present invention of FIG. In Fig. 7, the closed container 1 is placed on the test surface of the fabric, which may be made of glass, plastic, and other airtight waterproof materials. The fabric test surface emits formaldehyde into the closed container 1, and then the formaldehyde concentration, temperature and humidity in the closed container 1 are measured by the formaldehyde response module 2. The formaldehyde response module 2 includes a molecular imprinting polymer and an electrochemical conversion device, and the formaldehyde concentration in the closed container 1 can be statically tested. The formaldehyde emitted from the surface of the fabric to the closed container 1 reaches a stable concentration within 3-10 minutes. The "stability of concentration" is only a quasi-equilibrium, and the surface of the fabric emits formaldehyde into the container while the formaldehyde response module 2 simultaneously absorbs The formaldehyde is consumed to measure the concentration of formaldehyde in the closed container 1 and is converted into an electrical signal for transmission to the conversion module 3 outside the closed container 1. The conversion module 3 passes the relevant data, fabric structure and fabric weight tested according to the standard test method of ISO 14184-1. The conversion database 4 converts the electrical signal into the formaldehyde content of the fabric while correcting the conversion results based on the temperature at the time of the test. The operator can also interact with the input module 6 and the display module 7 at the same time.

The test results of the preferred embodiment of the system for measuring the formaldehyde content of the fabric of the present invention shown in Fig. 8 and the relevant comparative test charts for the test data according to the ISO 14184-1 standard test method are shown. In the figure, 11 twill or plain weave fabrics were measured. The readings of the system were compared according to the test data of the ISO 14184-1 standard test method. The comparison results are shown in Fig. 8. The test data of the present invention and the test data of the standard test method were constructed. For y=ax2+bx+c Or a first or second order regression function of y = ax + b for correlation comparison, where y is the response signal of the formaldehyde response module 2 at millivolts, and x is the ISO test data in μg/kg. It can be seen from the figure that there is a significant correlation between them.

Figure 9 is a graph showing the reproducibility test of a preferred embodiment of the system for measuring formaldehyde content of a fabric of the present invention. The figure shows the comparison of the test results of 8 different fabrics in a 15-day cycle. It can be seen that the test readings of each fabric change little with time, and the test readings of each fabric are highly reproducible. There is a strong comparability between different fabrics.

Table 1 shows the standard deviation of the test results using the standard test method ISO 14184-1 developed by the International Laboratory Research Association. Table 2 shows the standard deviation of the test results tested by the system. It can be seen from the table that the test error (2* standard deviation/formaldehyde content) of the test result of the standard test method is similar to the test error of the test result of the system, and therefore the reliability of the present invention and the standard test method of ISO14184-1 Reliability is on the same level.

Table 1

甲醛含量(F) Formaldehyde content (F)	标准偏差(G) Standard deviation (G)	测试误差(%) Test error (%)
42.4 42.4	6.4 6.4	30.2 30.2
76.5 76.5	9.1 9.1	23.8 23.8
84.7 84.7	7.6 7.6	17.9 17.9
121.7 121.7	8.1 8.1	13.3 13.3
173.1 173.1	15.1 15.1	17.4 17.4

Table 2

甲醛含量(F) Formaldehyde content (F)	标准偏差(G) Standard deviation (G)	测试误差(%) Test error (%)
14 14	1.55 1.55	22.2 22.2
39 39	3.71 3.71	19.0 19.0
72 72	6.66 6.66	18.5 18.5
160 160	11.15 11.15	13.9 13.9
193 193	14.13 14.13	14.6 14.6
233 233	20.46 20.46	17.6 17.6

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structural transformation made by using the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, is the same. The scope of the invention is included in the scope of the patent protection of the present invention.

Claims

A method for measuring formaldehyde content of a fabric, comprising the steps of:

S1, the closed container (1) receives the formaldehyde emitted from the surface of the fabric, and the formaldehyde response module (2) absorbs and consumes the formaldehyde in the closed container (1);

S2, the formaldehyde response module (2) converts formaldehyde concentration information in the closed container (1) into an electrical signal;

S3. Converting the electrical signal to a formaldehyde content of the fabric according to the electrical signal and conversion database (4).
The method of measuring the formaldehyde content of a fabric according to claim 1, characterized in that the conversion database (4) is determined by a standard test method according to ISO 14184-1, the structure of the corresponding fabric, and a pre-drawn curve of the weight of the corresponding fabric.
The method for measuring the formaldehyde content of a fabric according to claim 1, wherein the method for measuring the formaldehyde content of the fabric further comprises the steps of:

S4. Correct the conversion result of the step S3 according to the temperature at the time of the test.
The method for measuring the formaldehyde content of a fabric according to claim 1, wherein the method for measuring the formaldehyde content of the fabric further comprises the steps of:

S5. The operator interacts with the system for measuring the formaldehyde content of the fabric through the input module (6) and the display module (7).
The method for measuring the formaldehyde content of a fabric according to claim 1, wherein the formaldehyde response module (2) comprises a molecular imprinting polymer for detecting formaldehyde concentration information and an electrochemistry for converting the formaldehyde concentration information into an electrical signal. Conversion device.
A system for measuring the formaldehyde content of a fabric, comprising:

Closed container (1): used to receive formaldehyde emitted from the surface of the fabric;

Formaldehyde response module (2) for absorbing and consuming formaldehyde in the closed container (1), and converting formaldehyde concentration information in the closed container (1) into an electrical signal;

Conversion module (3): for converting the electrical signal into the formaldehyde content of the fabric according to the electrical signal and conversion database (4).
System for measuring the formaldehyde content of a fabric according to claim 6, characterized in that the conversion database (4) is determined from a pre-drawn curve according to the standard test method of ISO 14184-1, the structure of the respective fabric and the weight of the corresponding fabric.
The system for measuring formaldehyde content of a fabric according to claim 6, wherein the system for measuring formaldehyde content of the fabric further comprises:

Correction module (5): for correcting the conversion result of the conversion module (3) according to the temperature at the time of the test.
The system for measuring formaldehyde content of a fabric according to claim 6, wherein the system for measuring formaldehyde content of the fabric further comprises:

Input module (6): for the operator to input interactive commands;

Display module (7): used to display the test results.
The system for measuring the formaldehyde content of a fabric according to claim 6, wherein the formaldehyde response module (2) comprises a molecular imprinting polymer for detecting formaldehyde concentration information and an electrochemistry for converting the formaldehyde concentration information into an electrical signal. Conversion device.