CN113984753B - Formaldehyde detection test paper, preparation method thereof and formaldehyde detection system - Google Patents
Formaldehyde detection test paper, preparation method thereof and formaldehyde detection system Download PDFInfo
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- CN113984753B CN113984753B CN202111302187.7A CN202111302187A CN113984753B CN 113984753 B CN113984753 B CN 113984753B CN 202111302187 A CN202111302187 A CN 202111302187A CN 113984753 B CN113984753 B CN 113984753B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/775—Indicator and selective membrane
Abstract
The invention provides a formaldehyde detection test paper, a preparation method thereof and a formaldehyde detection system, wherein the formaldehyde detection test paper comprises a hydrophilic layer prepared from a breathable hydrophilic material and a hydrophobic layer formed by inorganic particles attached to one side of the hydrophilic layer; at least the hydrophobic layer contains formaldehyde color reagent; this aldehyde detecting system includes formaldehyde detection module and formaldehyde test paper, and formaldehyde test paper detachable installs in formaldehyde detection module's detection cavity. According to the invention, the inorganic particles are adhered to the surface of one side of the hydrophilic layer prepared from the air-permeable hydrophilic material to form the hydrophobic layer containing the formaldehyde color reagent, and the formaldehyde color reagent is used for developing color in the hydrophobic layer to detect the concentration of formaldehyde.
Description
Technical Field
The invention relates to the technical field of formaldehyde detection, in particular to formaldehyde detection test paper, a preparation method thereof and a formaldehyde detection system.
Background
The method for detecting formaldehyde is various, wherein the method for detecting formaldehyde by using the test paper is convenient and quick and is deeply popular with the majority of users. The manufacturing principle of the formaldehyde test paper card is that a color reagent is combined with test paper to form the formaldehyde test paper card, and then the formaldehyde test is carried out by using the formaldehyde test paper card. The test paper material is generally made of cotton linter fibers or other cellulose fibers. Has porosity, air permeability and hygroscopicity, and has wide application range. From the performance of the test paper, the change of humidity environmental conditions has an influence on the air permeability and the moisture absorption of the test paper. The color reagent for formaldehyde detection is a complex formed by reacting a plurality of reagents, and the change of humidity has an influence on the color development degree. From the above, the formaldehyde detection results are not very accurate due to the humidity change of the environment of the test paper and the color reagent. Therefore, it is necessary to produce formaldehyde test paper and color reagent which can be applied to environmental conditions and humidity changes without affecting the detection result.
Disclosure of Invention
The invention provides formaldehyde detection test paper, a preparation method thereof and a formaldehyde detection system, which are used for solving the technical problems.
The invention provides a formaldehyde test paper in a first aspect, which comprises a hydrophilic layer prepared from a breathable hydrophilic material and a hydrophobic layer formed by inorganic particles attached to one side of the hydrophilic layer; wherein at least the hydrophobic layer contains a formaldehyde coloring agent.
The second invention provides a preparation method of formaldehyde test paper, which comprises the following steps:
mixing inorganic particles with an adhesive, uniformly spraying the mixture on one side of the hydrophilic layer, and drying to obtain a test paper material;
and soaking the test paper material into a formaldehyde color developing reagent, taking out and drying to obtain the formaldehyde detection test paper.
Preferably, the inorganic particles comprise glass beads, silica gel and silica particles;
preferably, the adhesive is polydimethylsiloxane; the mass ratio of the glass beads to the silica gel to the silica particles is 5.
Preferably, the drying process comprises: the hydrophilic layer sprayed with the inorganic particles was baked at 30 ℃ for 12 hours, then heat-treated at 120 ℃ for 24 hours, followed by Soxhlet extraction after cooling to 30 ℃ for 3 hours.
The third aspect of the invention provides a formaldehyde detection system, which comprises a formaldehyde detection module and the formaldehyde detection test paper, wherein the formaldehyde detection test paper is detachably arranged in a detection cavity of the formaldehyde detection module.
Preferably, the formaldehyde detection module includes:
a detection body in which the detection cavity is formed;
the sampling pump is used for driving gas to flow from the gas inlet end of the detection cavity to the gas outlet end of the detection cavity;
the test paper mounting piece is movably mounted in the detection cavity; the test paper mounting piece is provided with a detection through hole, and the formaldehyde detection test paper is detachably mounted on the test paper mounting piece and shields the detection through hole; and
and the detection assembly is used for judging the concentration of the formaldehyde according to the color of the hydrophobic layer of the formaldehyde detection test paper.
Preferably, the inner wall of the detection cavity is provided with a mounting groove located between the air inlet end and the air outlet end of the detection cavity, two opposite side walls of the mounting groove are provided with guide grooves, the detection machine body is provided with a mounting hole corresponding to the mounting groove, and one end of the test paper mounting part penetrates through the mounting hole and is in sliding connection with the guide grooves.
Preferably, the test paper mounting part comprises a fixed plate, a movable plate, an elastic part and a sealing part, one end of the fixed plate is slidably connected with the guide groove, the other end of the fixed plate penetrates through the mounting hole and is connected with the sealing part, the sealing part is in interference fit with the mounting hole, one end of the movable plate is hinged to one end of the fixed plate, which is far away from the sealing part, one end of the elastic part is connected with the movable plate, the other end of the elastic part is connected with the fixed plate and generates elastic force for driving the other end of the movable plate to be far away from one end of the fixed plate, which is opposite to the sealing part, and a clamping gap for mounting the formaldehyde detection test paper is formed between the movable plate and the fixed plate; the movable plate and the fixed plate are respectively embedded in the two guide grooves in a sliding mode, the width of each guide groove is gradually reduced from one end, opposite to the installation hole, of the guide groove to the other end of the guide groove, the thickness of the movable plate and/or the fixed plate is gradually reduced from one end, opposite to the sealing element, of the guide groove to the other end of the guide groove, and the sum of the thicknesses of the movable plate and the fixed plate is matched with the width of the guide groove.
Preferably, a placing groove for placing the formaldehyde detection test paper is formed in one side of the fixed plate relative to the movable plate, a fixing protrusion matched with the mounting groove is formed in one side of the movable plate relative to the fixed plate, a first hole and a second hole are formed in the mounting groove and the fixing protrusion in a penetrating mode respectively, and the first hole is communicated with the second hole to form the detection through hole.
Preferably, the test paper mounting part further comprises a plug connector formed by extending one end of the fixing plate, which is far away from the sealing element, and a heating strip embedded in the fixing plate, wherein two ends of the heating strip are electrically connected with the plug connector; and a plug board corresponding to the plug connector is arranged on the side wall of one end of the mounting groove, which is far away from the mounting hole.
According to the invention, the inorganic particles are attached to the surface of one side of the hydrophilic layer made of the air-permeable hydrophilic material to form the hydrophobic layer containing the formaldehyde color reagent, and the formaldehyde color reagent is used for developing color in the hydrophobic layer to detect the concentration of formaldehyde.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of the test paper for detecting formaldehyde of the present invention;
FIG. 2 is a schematic view of the formaldehyde detection system of the present invention without the test strip mounting member inserted;
FIG. 3 is a schematic view of the formaldehyde detection system of the present invention after insertion into a test strip mounting member;
fig. 4 is a schematic cross-sectional view of a fixing plate according to the present invention;
FIG. 5 is a schematic circuit diagram of the formaldehyde detection system of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are presented herein only to illustrate and explain the present invention and not to limit the present invention.
As shown in fig. 1 to 3, the present invention provides a formaldehyde detection system, which includes a formaldehyde detection module 10 and formaldehyde detection test paper 20, wherein the formaldehyde detection test paper 20 is detachably mounted in a detection cavity 111 of the formaldehyde detection module 10. The formaldehyde detection module 10 in this embodiment adopts a conventional formaldehyde detection device capable of being matched with the formaldehyde detection test paper 20 to detect the concentration of formaldehyde in the prior art, and the formaldehyde detection test paper 20 in this embodiment includes a hydrophilic layer 21 made of a breathable hydrophilic material and a hydrophobic layer 22 formed by inorganic particles attached to one side of the hydrophilic layer 21; at least the water-repellent layer 22 contains a formaldehyde coloring agent. This embodiment contains formaldehyde color reagent on the hydrophobic layer 22 that inorganic particle formed, so that formaldehyde color reagent develops color in hydrophobic layer 22, and the hydrophobic layer 22 that inorganic particle formed possesses hydrophobic effect on the one hand, clearance between the inorganic particle can produce the capillary action in the hydrophobic layer 22 on the other hand, so that the moisture in the gas that waits to detect passes hydrophobic layer 22 and gets into hydrophilic layer 21 under the capillary action, moisture in the gas that waits to detect has been avoided to above-mentioned mode stops in hydrophobic layer 22, and then the influence of humidity to formaldehyde detection accuracy has been avoided. It can be understood that, in this embodiment, it is not limited that only the hydrophobic layer 22 contains the formaldehyde color reagent, but the hydrophilic layer 21 may also contain the formaldehyde color reagent, so that in the formaldehyde detection, the degree of influence of humidity on the formaldehyde detection accuracy can be judged significantly by the color development degree of the hydrophobic layer 22 and the hydrophilic layer 21.
In this example, the formaldehyde test paper 20 is prepared as follows: mixing inorganic particles with an adhesive, uniformly spraying the mixture on one side of the hydrophilic layer 21, and drying to obtain a test paper material; and immersing the test paper material into a formaldehyde color developing reagent, taking out the test paper material and drying the test paper material to obtain the formaldehyde detection test paper 20.
In this embodiment, the hydrophilic layer 21 should have air permeability and hydrophilicity, and may be made of an air permeable hydrophilic material, and in this embodiment, a quantitative filter paper made of an air permeable hydrophilic material may be directly used, and in this embodiment, a double-loop fast quantitative filter paper may be specifically used, and the size is 110 × 110. It is understood that, in this embodiment, other breathable hydrophilic materials may be selected to prepare the hydrophilic layer 21, and other brands of filter paper with the same efficacy may also be selected, which is not limited herein.
In order to improve the capillary effect and promote the moisture to enter into the hydrophilic layer 21, in the embodiment, the inorganic particles are preferably a mixture of glass beads, silica gel and silica particles, wherein the particle size of the glass beads is 9 to 13 μm, the particle size of the silica gel is 20 to 60 μm, the silica particles are particles meeting the national standard, and generally 100 to 300nm is preferred; in the embodiment, glass beads, silica gel and silica dioxide with different particle sizes are selected and mixed according to a set ratio to serve as inorganic particles, which is beneficial to forming a gap for promoting a capillary effect between the inorganic particles, so that gas can conveniently pass through the gap, and moisture can conveniently pass through the hydrophobic layer 22 and enter the hydrophilic layer 21, wherein the mass ratio of the glass beads, the silica gel and the silica dioxide particles is preferably set to be 5. Specifically, in this embodiment, glass beads prepared by Sigma may be selected, the diameter of the glass beads is 9 to 13um, and other glass beads of other brands with the same efficacy may also be selected, which is not particularly limited herein; in this embodiment, silica gel prepared by Sigma company may be selected, and the diameter of the silica gel particle is 20 to 60um, and certainly, other brands of silica gel with the same efficacy may also be selected, which is not particularly limited herein; the silica prepared by Evonik company can be selected in this embodiment, and other brands of silica with the same efficacy can be selected, which is not limited herein. Preferably, the adhesive is polydimethylsiloxane, and the polydimethylsiloxane is analytically pure. Polymer dimethyl siloxane is used as an adhesive, and can be chemically connected with a hydroxylated surface in the cellulose of a quantitative filter paper material during heating treatment; since the glass fibers and silica particles are slightly acidic, the cellulose of the filter paper material has hydrophilicity. Therefore, the polymer dimethyl siloxane can be used as an adhesive to adhere inorganic matters such as test paper materials cellulose and silica particles to the surface of the filter paper material.
The preparation method of the formaldehyde test paper 20 of this embodiment is as follows: 200ml of polydimethylsiloxane were placed in a 500ml beaker, and 5g of glass beads, 12g of silica gel and 1.5g of silica were added in succession. Mixing the above solutions, and performing ultrasonic treatment for 30 min to obtain stable and uniformly dispersed mixture; uniformly spraying the dispersed mixture solution on one side of the selected quantitative filter paper, then placing the mixture solution into an oven, baking the mixture solution for 12 hours at the temperature of 30 ℃ to volatilize polydimethylsiloxane, and raising the temperature of the oven to 120 ℃ to perform heat treatment for 24 hours so as to solidify inorganic particles on the surface of the quantitative test paper; cooling to 30 ℃, performing Soxhlet extraction for 3 hours, and completely removing unreacted reagents on quantitative test paper to obtain test paper materials; and (3) soaking the test paper material into a formaldehyde color reagent for 3min, taking out, draining, and then putting into a 37 ℃ oven drying box for drying for 10min to obtain the formaldehyde detection test paper 20.
The formaldehyde color reagent of the embodiment is prepared by the following method: weighing 2.3g of coumarin in a beaker, adding 40ml of concentrated hydrochloric acid into the beaker, adding 0.8g of sodium nitrite aqueous solution, and stirring for reaction for 1.0h to generate a first reagent; weighing 8.2g of stannous chloride dihydrate, adding 30ml of concentrated hydrochloric acid, and stirring for dissolving to generate a reagent II; adding the reagent II into the reagent I, stirring and dissolving, and stirring and reacting for 1.0h to generate a reagent III; adding 10% of a sodium hydroxide solution into the third reagent until ph =7, then adding dichloromethane for extraction, and adding methanol for purification to obtain 1.7g of yellow solid; weighing 0.1g of yellow solid, and adding the yellow solid into 100ml of acetone solution to obtain the formaldehyde color developing reagent IV. Wherein the environmental temperature for preparing the first reagent, the second reagent and the third reagent is controlled to be between minus 5 degrees and 0 degrees.
In order to compare the excellent effects of the inorganic particles selected in this example on promoting the capillary effect and the formaldehyde detection accuracy, the following experimental examples are used for illustration.
Experimental example 1
Putting 200ml of polydimethylsiloxane into a 500ml beaker, and sequentially adding 5g of glass beads, 12g of silica gel and 1.5g of silicon dioxide, wherein the particle size of the glass beads is about 11 micrometers, the particle size of the silica gel is about 40 micrometers, and the particle size of the silicon dioxide is about 200 nm; mixing the above solutions, and performing ultrasonic treatment for 30 min to obtain stable and uniformly dispersed mixture; uniformly spraying the dispersed mixture solution on one side of the selected quantitative filter paper, then putting the mixture solution into an oven, baking the mixture solution for 12 hours at the temperature of 30 ℃ to volatilize polydimethylsiloxane, and then heating the oven to 120 ℃ for heat treatment for 24 hours to enable inorganic particles to be solidified on the surface of the quantitative test paper; cooling to 30 ℃, performing Soxhlet extraction for 3 hours, and completely removing unreacted reagents on quantitative test paper to obtain a test paper material; and (3) soaking the test paper material into a formaldehyde color reagent for 3min, taking out, draining, and drying in a 37 ℃ constant temperature oven drying box for 10min to obtain the formaldehyde detection test paper 20.
Experimental example 2
Substantially the same as in experimental example 1, except that: the inorganic particles were 3g of glass beads, 14g of silica gel and 1.5g of silica.
Experimental example 3
Substantially the same as in experimental example 1, except that: the inorganic particles were 7g of glass beads, 7g of silica gel and 1.5g of silica.
Experimental example 4
Substantially the same as in experimental example 1, except that: the inorganic particles were only 18g of glass beads.
Experimental example 5
Substantially the same as in experimental example 1, except that: the inorganic particles were only 18g of silica gel.
Experimental example 6
Substantially the same as in experimental example 1, except that: the inorganic particles were only 18g of silica.
Experimental example 7
Substantially the same as in experimental example 1, except that: the inorganic particles were only 6g of glass beads and 12g of silica gel.
Experimental example 8
Substantially the same as in experimental example 1, except that: the inorganic particles were only 12g of glass beads and 6g of silica.
Experimental example 9
Substantially the same as in experimental example 1, except that: the inorganic particles were only 12g of silica gel and 6g of silica.
Experimental example 10
Substantially the same as in experimental example 1, except that: the hydrophobic layer 22 attached to one side of the hydrophilic layer 21 is a microporous ePTFE (polytetrafluoroethylene) film.
The formaldehyde test paper 20 prepared in the above experimental examples 1 to 8 is matched with the formaldehyde detection module 10 and used for detecting a gas to be detected (humidity 85%) with a specific formaldehyde concentration under the same condition, each experimental example is detected for 5 times, and the average value is removed, and the detection results are shown in the following table:
it is found from the comparison between the above experimental examples 1 to 9 and the experimental example 10 that when inorganic particles are attached to the hydrophilic layer 21 to form the hydrophobic layer 22, the capillary effect is facilitated, and the influence of humidity on the accuracy of formaldehyde detection is reduced, while the water molecules in the air-permeable hydrophobic film can be absorbed by the hydrophilic layer 21 by directly using the air-permeable hydrophobic film, but the air-permeable hydrophobic film can prevent water droplets from passing through, so that the side of the air-permeable hydrophobic film away from the hydrophilic layer 21 contains tiny water droplets, which inevitably influences the accuracy of formaldehyde detection; on the other hand, comparing experimental examples 1 to 3 with experimental examples 4 to 8, it was found that when glass beads of different particle sizes, silica gel and silica are mixed, the capillary effect thereof can be more suitable for the gap of the capillary effect, and when only one or two kinds of inorganic particles are used, the capillary effect thereof on water droplets becomes poor; comparing example 1 with example 3, it is found that when glass beads with different particle sizes, silica gel and silicon dioxide are mixed according to a set proportion, the capillary effect is best, and the accuracy of formaldehyde detection is highest.
As shown in fig. 2 and fig. 3, the formaldehyde detecting module 10 of this embodiment includes a detecting body 11, a sampling pump 12, a test paper mounting member 13 and a detecting assembly 14, the detecting body 11 forms the detecting cavity 111 therein, the sampling pump 12 is used for driving gas to flow from an air inlet end of the detecting cavity 111 to an air outlet end thereof, and the test paper mounting member 13 is movably mounted in the detecting cavity 111; the test paper mounting piece 13 is provided with a detection through hole, the formaldehyde detection test paper 20 is detachably mounted on the test paper mounting piece 13 and shields the detection through hole, and the detection assembly 14 is used for judging the concentration of formaldehyde according to the color of the hydrophobic layer 22 of the formaldehyde detection test paper 20. The detecting assembly 14 includes an excitation light source 141, a photoelectric sensor 142, a filter 143, a temperature and humidity sensor 144, an air pressure sensor 145, a plug board 146, a power supply (not shown), a liquid crystal display (not shown), and a microprocessor (not shown).
When the gas sampling device is specifically arranged, a plurality of accommodating holes communicated with the detection cavity 111 are formed in the detection body 11, one of the accommodating holes is a gas inlet hole 112, one is a gas outlet hole 113, two are light source holes 114, and one is a photoelectric sensor hole 115, the gas inlet hole 112 can be communicated with the outside so that gas to be detected can enter the detection cavity 111, the gas outlet hole 113 can facilitate the discharge of the entered gas, the sampling pump 12 can adopt a gas-extraction type pump body, and the gas extraction end of the sampling pump body is communicated with the gas outlet hole 113; the two light source holes 114 are used for installing an excitation light source 141, the excitation light source 141 irradiates the water-repellent layer 22 of the formaldehyde detection test paper 20 on the test paper installation part 13 at a certain angle, after gas sampling, generated light irradiates a photoelectric sensor 142 installed in the photoelectric sensor hole 115, and the photoelectric sensor 142 converts the received light signal into an electric signal and converts the electric signal into formaldehyde gas concentration after the electric signal is processed by a microprocessor. A filter 143 is further installed in the photosensor hole 115 to filter out stray light irradiated into the photosensor 142. In this embodiment, the photoelectric sensor 142 is a hamamatsu S1133-type photoelectric sensor, the excitation light source 141 is a high-brightness LED, and the microprocessor is a single-chip microcomputer of STC89C 60. In practical application, since the formaldehyde detection is affected by the air pressure and temperature, the present embodiment further includes a temperature and humidity sensor 144 for detecting the temperature and humidity in the detection cavity 111 in real time, which is the AM2320 type, and an air pressure sensor 145 for detecting the air pressure in the detection cavity 111 in real time, which is the CPS120 type. As shown in fig. 5, the photoelectric sensor 142, the excitation light source 141, the temperature and humidity sensor 144, the pressure sensor 145 and the sampling pump 12 are all connected to the microprocessor to automatically detect the formaldehyde concentration.
In order to facilitate the detachment of the test paper mounting member 13, in this embodiment, the inner wall of the detection cavity 111 is provided with an installation groove 116 located between the air inlet end and the air outlet end of the detection cavity 111, two opposite side walls of the installation groove 116 are provided with guide grooves 117, the detection body 11 is provided with an installation hole 118 corresponding to the installation groove 116, and one end of the test paper mounting member 13 passes through the installation hole 118 and is slidably connected with the guide grooves 117.
However, in practical applications, most of the test paper mounting members 13 currently adopt a mode of adhering or placing a test paper card on the test paper mounting member 13, or pressing and fixing the test paper card on the test paper mounting member 13 by using a pressing cover, which is a poor stability for fixing the test paper card, and the test paper card is very inconvenient to replace, based on this, the test paper mounting member 13 of this embodiment includes a fixed plate 131, a movable plate 132, an elastic member 133, and a sealing member 134, one end of the fixed plate 131 is slidably connected with the guide slot 117, the other end of the fixed plate 131 passes through the mounting hole 118 and is connected with the sealing member 134, the sealing member 134 is in interference fit with the mounting hole 118, the sealing member 134 may be made of rubber, and an end surface of the sealing member 134, which is far away from the fixed plate 131, may be provided with a pull ring 135 so as to pull the test paper mounting member 13 out of the mounting groove 116; one end of the movable plate 132 is hinged to one end of the fixed plate 131, which is away from the sealing element 134, one end of the elastic element 133 is connected to the movable plate 132, the other end of the elastic element 133 is connected to the fixed plate 131, and generates an elastic force for driving the other end of the movable plate 132, which is away from the fixed plate 131, to the end of the sealing element 134, the elastic element 133 may be installed on a pin shaft hinged to the movable plate 132 and the fixed plate 131 in a torsion spring manner, the elastic element 133 may also exist in a spring or elastic sheet manner, and one end of the elastic element is connected to the movable plate 132, and the other end of the elastic element is connected to the fixed plate 131, in this embodiment, a spring connection manner is specifically adopted. The two sides of the movable plate 132 and the fixed plate 131 are respectively slidably fitted in the two guide grooves 117, the width of the two guide grooves 117 gradually decreases from one end of the movable plate 132 to the other end of the movable plate 117 relative to the mounting hole 118, the thickness of the movable plate 132 and/or the fixed plate 131 gradually decreases from one end of the movable plate 132 to the other end of the fixed plate 131 relative to the sealing member 134, the sum of the thicknesses of the movable plate 132 and the fixed plate 131 is matched with the width of the guide groove 117, and a clamping gap for mounting the formaldehyde test paper 20 is formed between the movable plate 132 and the fixed plate 131, so that when the test paper mounting member 13 is pulled out, the test paper mounting member 13 slides along the guide groove 117 to the end of the guide groove 117 with the larger width, the movable plate 132 and the fixed plate 131 are acted by the elastic member 133, the ends of the movable plate 132 and the fixed plate 131 gradually separate from one end of the sealing member 134 to expose the clamping gap between the movable plate 132 and the fixed plate 131, at the same time, the formaldehyde test paper mounting member 13 is taken out and replaced, and then the test paper mounting member 13 is inserted into the guide groove 117, and the test paper mounting member 13 is inserted into the guide groove 117, so that the test paper mounting member 132 and the formaldehyde test paper mounting member 134 are easily and the fixed plate mounting member 134 are conveniently and the formaldehyde test paper mounting member 132 are inserted.
In order to facilitate the displacement of the formaldehyde test paper 20 during the insertion of the test paper mounting member 13 into the mounting groove 116, in this embodiment, a placing groove 131a for placing the formaldehyde test paper 20 is formed on one side of the fixed plate 131 opposite to the movable plate 132, a fixing protrusion 132a matched with the placing groove 131a is formed on one side of the movable plate 132 opposite to the fixed plate 131, and when the movable plate 132 is tightly attached to the fixed plate 131, the fixing protrusion 132a is inserted into the placing groove 131a and presses the formaldehyde test paper 20 into the placing groove 131 a. The placing groove 131a and the fixing protrusion 132a are respectively formed with a first hole 131b and a second hole 132b, and the first hole 131b and the second hole 132b are communicated to form the detection through hole, which facilitates the gas to be detected to pass through the formaldehyde detection test paper 20 in the placing groove 131 a. It should be noted that in this embodiment, in a specific operation, the water-repellent layer 22 of the formaldehyde test paper 20 needs to face the photosensor 142 and the excitation light source 141, so as to detect the degree of color development on the water-repellent layer 22 of the formaldehyde test paper 20.
As shown in fig. 2 and 4, in actual detection, the test strip mounting member 13 is also affected by temperature, so that the test strip mounting member further includes a plug 136 formed by extending one end of the fixing plate 131 away from the sealing member 134 and a heating bar 137 embedded in the fixing plate 131, and two ends of the heating bar 137 are electrically connected to the plug 136; the side wall of one end of the mounting groove 116, which is far away from the mounting hole 118, is provided with a plug board 146 corresponding to the plug connector 136, the plug board 146 is provided with a plug hole matched and plugged with the plug connector, the plug board 146 can be connected with a microprocessor to supply power to the heating strip 137, so that the fixing plate 131 and the formaldehyde detection test paper 20 on the fixing plate 131 are heated, the temperature and humidity sensor 144 can adopt an infrared temperature sensor to detect the temperature of the fixing plate 131, and the microprocessor can control the heating time of the heating strip 137 through the temperature of the fixing plate 131. Moreover, in the embodiment, the plug-in connector 136 is arranged on the fixing plate 131 to be in plug-in fit with the plug-in board 146 on the mounting groove 116, so that the heating strip 137 in the fixing plate 131 can be detachably connected with the power supply component thereof, and the heating strip 137 embedded in the fixing plate 131 is also beneficial to improving the heating stability and efficiency; in a specific arrangement, the heating strip 137 may be U-shaped, and two free ends thereof may be electrically connected to two connector terminals of the connector 136, respectively. Generally, the microprocessor controls the temperature of the fixing plate 131 to be approximately 30 ℃, and specifically, when the temperature and humidity sensor 144 detects that the temperature of the fixing plate 131 exceeds 30.5 ℃, the microprocessor controls to stop supplying power to the heating bar 137 and stop heating the heating bar 137, and when the temperature and humidity sensor 144 detects that the temperature of the fixing plate 131 is lower than 29.5 ℃, the microprocessor controls to supply power to the box heating bar 137 and start heating the heating bar 137.
According to the invention, inorganic particles are adhered to the surface of one side of the hydrophilic layer 21 made of the breathable hydrophilic material to form the hydrophobic layer 22 containing the formaldehyde color developing reagent, the formaldehyde color developing reagent is used for developing color in the hydrophobic layer 22 to detect the concentration of formaldehyde, and as moisture in the hydrophobic layer 22 enters the hydrophilic layer 21 under the action of the hydrophilic layer 21, moisture influencing the accuracy of formaldehyde detection is prevented from existing in the hydrophobic layer 22, and the influence of humidity on formaldehyde detection is prevented.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The formaldehyde test paper is characterized by comprising a hydrophilic layer prepared from a breathable hydrophilic material and a hydrophobic layer formed by inorganic particles attached to one side of the hydrophilic layer; wherein at least the hydrophobic layer contains a formaldehyde color reagent;
the formaldehyde test paper is prepared by the following method: mixing inorganic particles with an adhesive, uniformly spraying the mixture on one side of the hydrophilic layer, and drying to obtain a test paper material; soaking a test paper material into a formaldehyde color developing reagent, taking out the test paper material and drying the test paper material to obtain the formaldehyde detection test paper;
the inorganic particles comprise glass beads, silica gel and silica particles, the mass ratio of the glass beads to the silica gel to the silica particles is 5.
2. A method of making the formaldehyde test paper of claim 1, comprising the steps of:
mixing inorganic particles with an adhesive, uniformly spraying the mixture on one side of the hydrophilic layer, and drying to obtain a test paper material;
and (3) soaking the test paper material in a formaldehyde color developing reagent, taking out the test paper material and drying the test paper material to obtain the formaldehyde detection test paper.
3. The method of claim 2, wherein the adhesive is polydimethylsiloxane.
4. The method of claim 2, wherein the drying process comprises: the hydrophilic layer sprayed with the inorganic particles was baked at 30 ℃ for 12 hours, then heat-treated at 120 ℃ for 24 hours, followed by Soxhlet extraction after cooling to 30 ℃ for 3 hours.
5. A formaldehyde detection system, which is characterized by comprising a formaldehyde detection module and the formaldehyde detection test paper as claimed in claim 1, wherein the formaldehyde detection test paper is detachably mounted in a detection cavity of the formaldehyde detection module;
the formaldehyde detection module comprises:
a detection body in which the detection cavity is formed;
the sampling pump is used for driving gas to flow from the gas inlet end of the detection cavity to the gas outlet end of the detection cavity;
the test paper mounting piece is movably mounted in the detection cavity; the test paper mounting piece is provided with a detection through hole, and the formaldehyde detection test paper is detachably mounted on the test paper mounting piece and shields the detection through hole; and
and the detection assembly is used for judging the concentration of the formaldehyde according to the color of the hydrophobic layer of the formaldehyde detection test paper.
6. The formaldehyde detecting system according to claim 5, wherein the detecting cavity has an installation groove formed on an inner wall thereof and located between an air inlet end and an air outlet end of the detecting cavity, guide grooves are formed on two opposite side walls of the installation groove, an installation hole corresponding to the installation groove is formed in the detecting body, and one end of the test paper installation member passes through the installation hole and is slidably connected to the guide grooves.
7. The formaldehyde detection system according to claim 6, wherein the test strip mounting member comprises a fixed plate, a movable plate, an elastic member, and a sealing member, wherein one end of the fixed plate is slidably connected to the guide slot, the other end of the fixed plate passes through the mounting hole and is connected to the sealing member, the sealing member is in interference fit with the mounting hole, one end of the movable plate is hinged to one end of the fixed plate, which is opposite to the sealing member, one end of the elastic member is connected to the movable plate, the other end of the elastic member is connected to the fixed plate, and generates an elastic force for urging the other end of the movable plate to be opposite to one end of the fixed plate, which is opposite to the sealing member, and a clamping gap for mounting the formaldehyde detection test strip is formed between the movable plate and the fixed plate; the movable plate and the fixed plate are respectively embedded in the two guide grooves in a sliding mode, the width of each guide groove is gradually reduced from one end, opposite to the installation hole, of the guide groove to the other end, the thickness of the movable plate and/or the fixed plate is gradually reduced from one end, opposite to the sealing element, of the guide groove to the other end of the sealing element, and the sum of the thicknesses of the movable plate and the fixed plate is matched with the width of the guide grooves.
8. The formaldehyde detecting system according to claim 7, wherein a holding groove for holding the formaldehyde test paper is formed on one side of the fixed plate opposite to the movable plate, a fixing protrusion matching with the mounting groove is formed on one side of the movable plate opposite to the fixed plate, a first hole and a second hole are respectively formed through the mounting groove and the fixing protrusion, and the first hole and the second hole are communicated to form the detecting through hole.
9. The formaldehyde detection system according to claim 7, wherein the test paper mounting member further comprises a plug connector formed by extending one end of the fixing plate away from the sealing member and a heating strip embedded in the fixing plate, and two ends of the heating strip are electrically connected to the plug connector; and a plug board corresponding to the plug connector is arranged on the side wall of one end of the mounting groove, which is far away from the mounting hole.
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