阅读说明：本技术 一种家具板料中有害物的测试装置及方法 (Device and method for testing harmful substances in furniture board ) 是由 秦朦朦 于 2021-08-23 设计创作，主要内容包括：本发明涉及一种家具板料中有害物的测试装置及方法,涉及家具板料测试技术领域,包括测试箱、置放组件、气流内循环组件及对流吸收组件；所述置放组件滑动设于测试箱内；所述气流内循环组件设于测试箱内,通过气流内循环组件在测试箱内引发气流内循环,且将板料试件释放的有害气体经内循环后输送至对流吸收组件中吸收。本发明通过加强测试环境空气内循环,模拟家具使用环境中气体流动状态,提高甲醛的释放效果,同时设置的对流吸收组件使得释放的有害气体与吸收液具有强烈的对流吸收效果,有利于有害气体中的甲醛分子与吸收液的有效吸收,保证了测试数据的真实性,且整个装置结构紧凑,操作便携性高,应用推广效果好。(The invention relates to a device and a method for testing harmful substances in a furniture plate, which relate to the technical field of furniture plate testing and comprise a testing box, a placing component, an airflow internal circulation component and a convection absorption component; the placing component is arranged in the test box in a sliding manner; the air flow internal circulation assembly is arranged in the test box, air flow internal circulation is initiated in the test box through the air flow internal circulation assembly, and harmful gas released by the plate test piece is conveyed to the convection absorption assembly to be absorbed after internal circulation. The invention simulates the gas flowing state in the furniture using environment by strengthening the air internal circulation of the testing environment, improves the formaldehyde releasing effect, ensures that the released harmful gas and the absorption liquid have strong convection absorption effect by the arranged convection absorption component, is beneficial to the effective absorption of formaldehyde molecules in the harmful gas and the absorption liquid, ensures the authenticity of testing data, and has compact structure, high operation portability and good application and popularization effect.)

1. The utility model provides a harmful testing arrangement in furniture sheet material which characterized in that: comprises a test box (1), a placing component (2), an airflow internal circulation component and a convection absorption component (3);

the placing assembly (2) is slidably arranged in the test box (1) and is used for placing a sheet material test piece;

the convection absorption assembly (3) is arranged on the outer side of the test box (1) and is connected with an airflow discharge port of the airflow internal circulation assembly;

the air flow internal circulation component is arranged in the test box (1), air flow internal circulation is initiated in the test box (1) through the air flow internal circulation component, and harmful gas released by the plate test piece is conveyed to the convection absorption component (3) to be absorbed after internal circulation.

2. The device for testing harmful substances in furniture plates according to claim 1, is characterized in that: be equipped with closed chamber (4) in test box (1), the air current inner loop subassembly is including symmetry locate first wind circulation riser (5) and second wind circulation riser (6) on closed chamber (4) inside wall, locate interior circulating fan (8) and suction fan (11) and first wind circulation riser (5) and second wind circulation riser (6) at closed chamber (4) both ends and form between circulation plenum (7), the outside of interior circulating fan (8) is equipped with discharge pipe (9) and delivery pipe (10) of being connected respectively with first wind circulation riser (5) and second wind circulation riser (6), the one end of first wind circulation riser (5) is connected with suction fan (11).

3. The device for testing harmful substances in furniture plates according to claim 2, is characterized in that: the first air circulation vertical plate (5) is composed of a vertical air cylinder (51), a side plate (52), an exhaust-in connecting pipe (54) and an exhaust connecting pipe (55), an embedded groove (56) is formed in the top end of the vertical air cylinder (51), the side plate (52) is arranged on one side, close to the circulation air chamber (7), of the vertical air cylinder (51), a plurality of air outlet grids (53) are uniformly distributed on the side plate (52), the exhaust-in connecting pipe (54) is connected with the exhaust-in pipe (9), a suction pipe (12) connected with the exhaust connecting pipe (55) is arranged outside the suction fan (11), and the structure of the second air circulation vertical plate (6) is consistent with that of the first air circulation vertical plate (5) except the exhaust connecting pipe (55).

4. The device for testing harmful substances in furniture plates according to claim 2, is characterized in that: the air outlet of the suction fan (11) is connected with a conveying pipe (13) provided with an electromagnetic valve (14), the convection absorption assembly (3) comprises an absorption bottle (32), an inner insertion pipe (35) connected with the conveying pipe (13) is inserted into the top end of the absorption bottle (32), a liquid branch pipe (33) and a gas branch pipe (34) are arranged outside the absorption bottle (32), a guide pipe (37) is arranged outside the gas branch pipe (34), a plug is arranged outside the liquid branch pipe (33), a discharge port (36) provided with a valve is arranged at the bottom of the absorption bottle (32), and a hoop frame (31) connected with the test box (1) is arranged outside the absorption bottle (32).

5. The device for testing harmful substances in furniture plates according to claim 2, is characterized in that: sealed chamber (4) inside four corners department all is equipped with slide (15), place subassembly (2) and include base (21), the symmetry is equipped with two side bearer (22) on base (21) and locates closing plate (24) on two side bearer (22) tops, one side of closing plate (24) is equipped with guide arm (23) of pegging graft with four slide (15) correspondence activities, base (21) are equipped with symmetrical grudging post (26) with the opposite face of closing plate (24).

6. The device for testing harmful substances in furniture plates as claimed in claim 5, wherein: one side of the sealing plate (24) is provided with a sealing strip (16) embedded with the caulking groove (56), one side of the sealing plate (24) relative to the sealing strip (16) is provided with a handle (25), and the outer side walls of the two sides of the test box (1) are provided with lock catches (17) for fixing the sealing plate (24).

7. A method for testing harmful substances in furniture plates by using the testing device of any one of claims 1 to 6, which is characterized by mainly comprising the following steps,

s1, preparing a standard calibration solution, carrying out colorimetric analysis, drawing a standard curve, and calculating the slope f of the standard curve;

s2, preparing a plate test piece, sealing the periphery of the test piece by using a formaldehyde-free aluminum adhesive tape, and enabling the measured surface area of the test piece to be not less than 450cm²；

S3, putting the plate test piece into the placing component (2), pushing the placing component (2) to extend into the test box (1), keeping the test box (1) in a sealed state, and adding 20-40mL of distilled water into the convection absorption component (3);

s4, placing the whole testing device for 24h at 20 ℃, in the placing process, initiating air flow internal circulation in the testing box (1) through the air flow internal circulation component, conveying harmful gas released by the sheet material test piece to the convection absorption component (3) for absorption after internal circulation, wherein the solution of the convection absorption component (3) is the liquid to be tested;

s5, sucking the liquid to be detected obtained by 10mLS4 into a flask, adding a detection reagent, shaking up, putting into a constant-temperature water bath kettle at 40 ℃, heating for 15min, cooling to room temperature, carrying out colorimetric detection to obtain absorbance As, and simultaneously, replacing the liquid to be detected with distilled water to carry out a blank test to determine a blank value Ab;

and S6, calculating the release amount of the harmful gas of the plate material reagent according to the formula C ═ f (As-Ab), and accurately obtaining the plate material reagent release amount of 0.01 mg/L.

8. The method for testing harmful substances in the furniture board according to claim 7, wherein the method comprises the following steps: the detection reagent described in S5 was 10mL of an acetylacetone solution with a volume percentage concentration of 0.4% and 10mL of an ammonium acetate solution with a mass percentage concentration of 20%.

9. The method for testing harmful substances in the furniture board according to claim 7, wherein the method comprises the following steps: and in the S5, the harmful gas released by the plate test piece is formaldehyde gas.

10. The method for testing harmful substances in the furniture board according to claim 7, wherein the method comprises the following steps: and S3, before the sheet material test piece is placed into the placing assembly (2), placing the sheet material test piece under the conditions of relative humidity of 65% and temperature of 20 ℃ until the quality is constant, and simultaneously keeping the water content of the sheet material test piece at 6.5%.

Technical Field

The invention belongs to the technical field of furniture plate testing, and particularly relates to a device and a method for testing harmful substances in furniture plates.

Background

At present, while the furniture and home decoration industry is developing vigorously, the problem of indoor air pollution caused by the furniture and home decoration industry comes along with the furniture and home decoration industry, in recent years, more and more people begin to realize the influence of the indoor environment on health, have a safe and healthy home environment, and become a hot spot concerned by the public;

the plate is an indispensable important decoration material in modern life, the furniture is manufactured without opening the plate, the quality of the plate determines the quality of the furniture, harmful gas released by the furniture plate is mainly formaldehyde which is taken as a primary carcinogen, the exceeding of the formaldehyde easily causes cancer, and the respiratory system and the nervous system are seriously damaged, so that the test quantification of the formaldehyde gas released by the furniture plate is very important;

most of the existing test modes adopt an adsorption determination mode to carry out quantitative analysis on harmful substances released by the furniture plates, so that the main factors influencing the test data are the release degree of the harmful substances in the furniture plates and the absorption effect of absorption liquid, otherwise, the authenticity of the test data is difficult to ensure.

Therefore, the device and the method for testing the harmful substances in the furniture plates are provided.

Disclosure of Invention

The invention aims to solve the problems and provide a device and a method for testing harmful substances in furniture plates, which are simple in structure and reasonable in design.

The invention realizes the purpose through the following technical scheme:

a testing device for harmful substances in furniture plates comprises a testing box, a placing component, an airflow internal circulation component and a convection absorption component;

the placing assembly is arranged in the test box in a sliding mode and used for placing a sheet material test piece;

the convection absorption assembly is arranged on the outer side of the test box and is connected with an airflow discharge port of the airflow internal circulation assembly;

the air flow internal circulation assembly is arranged in the test box, air flow internal circulation is initiated in the test box through the air flow internal circulation assembly, and harmful gas released by the plate test piece is conveyed to the convection absorption assembly to be absorbed after internal circulation.

As a further optimization scheme of the invention, a closed chamber is arranged in the test box, the airflow internal circulation assembly comprises a first air circulation vertical plate and a second air circulation vertical plate which are symmetrically arranged on the inner side wall of the closed chamber, an internal circulation fan and a suction fan which are arranged at two ends of the closed chamber, and a circulation air chamber formed between the first air circulation vertical plate and the second air circulation vertical plate, an exhaust pipe and an exhaust pipe which are respectively connected with the first air circulation vertical plate and the second air circulation vertical plate are arranged outside the internal circulation fan, and one end of the first air circulation vertical plate is connected with the suction fan.

As a further optimization scheme of the invention, the first air circulation vertical plate is composed of a vertical air duct, a side plate, an exhaust inlet connecting pipe and an exhaust connecting pipe, a caulking groove is formed at the top end of the vertical air duct, the side plate is arranged on one side of the vertical air duct close to the circulation air chamber, a plurality of air outlet grids are uniformly distributed on the side plate, the exhaust inlet connecting pipe is connected with the exhaust inlet pipe, a suction pipe connected with the exhaust inlet pipe is arranged outside the suction fan, and the structure of the second air circulation vertical plate is consistent with that of the first air circulation vertical plate except the exhaust inlet pipe.

As a further optimized scheme of the invention, an air outlet of the suction fan is connected with a delivery pipe provided with an electromagnetic valve, the convection absorption assembly comprises an absorption bottle, an inner insertion pipe connected with the delivery pipe is inserted at the top end of the absorption bottle, a liquid branch pipe and a gas branch pipe are arranged outside the absorption bottle, a guide pipe is arranged outside the gas branch pipe, a plug is arranged outside the liquid branch pipe, a discharge port provided with a valve is arranged at the bottom of the absorption bottle, and a hoop frame connected with a test box is arranged outside the absorption bottle.

As a further optimization scheme of the invention, sliding seats are arranged at four corners inside the closed chamber, the placing assembly comprises a base, two side frames symmetrically arranged on the base and a closing plate arranged at the top ends of the two side frames, guide rods movably inserted into the four sliding seats are arranged on one side of the closing plate, and symmetrical vertical grooves are arranged on the opposite surfaces of the base and the closing plate.

As a further optimization scheme of the invention, one side of the sealing plate is provided with a sealing strip which is embedded in the embedding groove, one side of the sealing plate opposite to the sealing strip is provided with a handle, and the outer side walls of the two sides of the test box are provided with lock catches for fixing the sealing plate.

A method for testing harmful substances in furniture plates by using the testing device mainly comprises the following steps,

s1, preparing a standard calibration solution, carrying out colorimetric analysis, drawing a standard curve, and calculating the slope f of the standard curve;

s2, preparing a plate material test piece, and sealing the periphery of the test piece by using a formaldehyde-free aluminum adhesive tape to ensure that the measured surface area of the test piece is not less than 450cm 2;

s3, putting the plate test piece into the placing component, pushing the placing component to extend into the test box, keeping the test box in a sealed state, and adding 20-40mL of distilled water into the convection absorption component;

s4, placing the whole testing device for 24h at 20 ℃, in the placing process, initiating air flow internal circulation in the testing box through the air flow internal circulation assembly, conveying harmful gas released by the sheet material test piece to the convection absorption assembly for absorption after the internal circulation, wherein the solution of the convection absorption assembly is the liquid to be tested;

s5, sucking the liquid to be detected obtained by 10mLS4 into a flask, adding a detection reagent, shaking up, putting into a constant-temperature water bath kettle at 40 ℃, heating for 15min, cooling to room temperature, carrying out colorimetric detection to obtain absorbance As, and simultaneously, replacing the liquid to be detected with distilled water to carry out a blank test to determine a blank value Ab;

and S6, calculating the release amount of the harmful gas of the plate material reagent according to the formula C ═ f (As-Ab), and accurately obtaining the plate material reagent release amount of 0.01 mg/L.

As a further optimization scheme of the invention, the detection reagent described in S5 is 10mL of acetylacetone solution with volume percentage concentration of 0.4% and 10mL of ammonium acetate solution with mass percentage concentration of 20%.

As a further optimization scheme of the invention, the harmful gas released by the sheet material test piece in S5 is formaldehyde gas.

As a further optimization scheme of the invention, before the sheet material test piece in the S3 is placed in the placing assembly, the sheet material test piece is placed under the conditions of relative humidity of 65% and temperature of 20 ℃ until the quality is constant, and meanwhile, the water content of the sheet material test piece is kept at 6.5%.

The invention has the beneficial effects that:

1. in the invention, the whole testing device simulates the gas flowing state in the furniture using environment by strengthening the internal circulation of the testing environment air, the formaldehyde releasing effect is improved, and meanwhile, the set convection absorption assembly ensures that the released harmful gas and the absorption liquid have strong convection absorption effect, thus being beneficial to the effective absorption of formaldehyde molecules in the harmful gas and the absorption liquid, and ensuring the authenticity of testing data.

Drawings

FIG. 1 is a perspective view of the overall structure provided by the present invention;

FIG. 2 is a schematic view of the internal structure of the test box provided by the present invention;

FIG. 3 provides a right side view of FIG. 1 for the present invention;

FIG. 4 is a perspective view of the placement module of the present invention;

fig. 5 is a perspective view of the wind circulation vertical plate provided by the present invention;

in the figure: 1. a test box; 2. placing the assembly; 21. a base; 22. a side frame; 23. a guide bar; 24. a closing plate; 25. a handle; 26. erecting a groove; 3. a convection absorption assembly; 31. a hoop frame; 32. an absorption bottle; 33. a liquid branch pipe; 34. a gas branch pipe; 35. inserting a tube; 36. a discharge port; 37. a conduit; 4. a closed chamber; 5. a first air circulation vertical plate; 51. a vertical wind barrel; 52. a side plate; 53. an air outlet grille; 54. discharging into a connecting pipe; 55. a discharge connection pipe; 56. caulking grooves; 6. a second air circulation vertical plate; 7. a circulating air chamber; 8. an internal circulation fan; 9. a discharge pipe; 10. a discharge pipe; 11. a suction fan; 12. a suction tube; 13. a delivery pipe; 14. an electromagnetic valve; 15. a slide base; 16. a sealing strip; 17. and (5) locking.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

Example 1

As shown in fig. 1, a testing device for harmful substances in furniture plates comprises a testing box 1, a placing component 2, an airflow internal circulation component and a convection absorption component 3;

the placing assembly 2 is slidably arranged in the test box 1 and used for placing a sheet material test piece;

the convection absorption assembly 3 is arranged on the outer side of the test box 1 and is connected with an airflow discharge port of the airflow internal circulation assembly;

the air flow internal circulation component is arranged in the test box 1, air flow internal circulation is initiated in the test box 1 through the air flow internal circulation component, and harmful gas released by the sheet material test piece is conveyed to the convection absorption component 3 for absorption after internal circulation.

As shown in fig. 2, a closed chamber 4 is arranged in the test box 1 to provide a closed environment for testing, the airflow internal circulation assembly includes a first air circulation vertical plate 5 and a second air circulation vertical plate 6 symmetrically arranged on the inner side wall of the closed chamber 4, an internal circulation fan 8 and a suction fan 11 arranged at two ends of the closed chamber 4, and a circulation air chamber 7 formed between the first air circulation vertical plate 5 and the second air circulation vertical plate 6, a sheet material test piece is placed in the circulation air chamber 7 through the placement assembly 2, a discharge pipe 9 and a discharge pipe 10 respectively connected with the first air circulation vertical plate 5 and the second air circulation vertical plate 6 are arranged outside the internal circulation fan 8, one end of the first air circulation vertical plate 5 is connected with the suction fan 11, the internal circulation fan 8 is started, air sucked from the closed chamber 4 passes through the second air circulation vertical plate 6 and enters the internal circulation fan 8 through the discharge pipe 10, and then the air is discharged into the first air circulation vertical plate 5 through the discharge pipe 9, and the air flow is introduced into the circulation air chamber 7 through the first air circulation vertical plate 5, so that the internal circulation process of the air flow in the sealed chamber 4 is realized.

As shown in fig. 3, the air outlet of the suction fan 11 is connected with a delivery pipe 13 equipped with an electromagnetic valve 14, the convection absorption assembly 3 comprises an absorption bottle 32, an inner insertion pipe 35 connected with the delivery pipe 13 is inserted into the top end of the absorption bottle 32, the length of the inner insertion pipe 35 can be inserted below the liquid level of the absorption bottle 32, when harmful gas released from the sheet material is injected into the absorption bottle 32 through the inner insertion pipe 35, gas and liquid impact generates bubble tumbling, the convection absorption effect is strong, the absorption effect of the harmful formaldehyde gas and absorption liquid is improved, a liquid branch pipe 33 and a gas branch pipe 34 are arranged outside the absorption bottle 32, a conduit 37 is arranged outside the gas branch pipe 34, the gas branch pipe 34 and the conduit 37 are used for guiding out gas after convection absorption, the gas cannot overflow into the environment, a plug is arranged outside the liquid branch pipe 33 for sealing, the liquid branch pipe 33 is used for injecting distilled water, the bottom of the absorption bottle 32 is provided with a discharge port 36 provided with a valve and used for discharging liquid to be tested in the absorption bottle 32 after convection absorption, the outside of the absorption bottle 32 is provided with an anchor ear frame 31 connected with the test box 1, and the anchor ear frame 31 is used for fixing the absorption bottle 32.

As shown in fig. 5, the first air circulation vertical plate 5 is composed of a vertical air duct 51, a side plate 52, a discharge connection pipe 54 and a discharge connection pipe 55, the top end of the vertical air duct 51 is provided with a caulking groove 56, the side plate 52 is arranged at one side of the vertical air duct 51 close to the circulation air chamber 7, the side plate 52 is uniformly provided with a plurality of air outlet grilles 53, the discharge connection pipe 54 is connected with the discharge pipe 9, the suction pipe 12 connected with the discharge connection pipe 55 is arranged outside the suction fan 11, after the suction fan 11 is started, the generated suction force enables the air flow inside the sealed chamber 4 to enter the vertical air duct 51, and enter the suction connection pipe 11 through the discharge pipe 55 via the suction pipe 12, and is sent into the convection absorption assembly 3 from the delivery pipe 13 via the suction fan 11, the structure of the second air circulation vertical plate 6 is consistent with the structure of the first air circulation vertical plate 5 except the discharge connection pipe 55, the second air circulation vertical plate 6 is only connected with the air inlet end of the internal circulation fan 8 and is not connected with the suction fan 11.

As shown in fig. 2 and 4, the slide 15 is all equipped with in the inside four corners department of airtight chamber 4, place subassembly 2 and include base 21, the symmetry is equipped with two side bearer 22 on the base 21 and locates the closing plate 24 on two side bearer 22 tops, one side of closing plate 24 is equipped with the guide arm 23 that corresponds the activity grafting with four slide 15, places sliding fit between subassembly 2 and the test box 1, convenient operation, the opposite face of base 21 and closing plate 24 is equipped with symmetrical grudging post 26 for the card is put the board material test piece.

One side of closing plate 24 is equipped with and inlays the sealing strip 16 of dress mutually with caulking groove 56, guarantees that the structure between closing plate 24 and the test box 1 is sealed, guarantees that the inside airtight chamber 4 of test box 1 and circulation plenum 7 have better gas tightness, closing plate 24 is equipped with handle 25 for one side of sealing strip 16, makes things convenient for the pull operation, the both sides lateral wall of test box 1 all is equipped with the hasp 17 of fixed closing plate 24, guarantees that closing plate 24 and test box 1's structure is fixed for place the seal structure between subassembly 2 and the test box 1 and be difficult for breaking away from.

The working principle of the whole testing device is that firstly, a processed sheet material test piece is placed into the placing component 2, after the upright state of the sheet material test piece is ensured, the placing component 2 is pushed to slide into the testing box 1, meanwhile, the structure of the sealing plate 24 and the testing box 1 is ensured to be fixed by utilizing the lock catches 17 which are arranged on the outer side walls of the two sides of the testing box 1 and are used for fixing the sealing plate 24, so that the sealing structure between the placing component 2 and the testing box 1 is not easy to separate, and at the moment, the sheet material test piece is injected into the circulating air chamber 7 in the sealed chamber 4 in the upright state and is placed between the first air circulating vertical plate 5 and the second air circulating vertical plate 6;

then, the whole testing device is placed at 20 ℃ for 24 hours, in the placing process, the internal circulation fan 8 is controlled to be started, a sheet material test piece can release toxic formaldehyde gas in the sealed chamber 4, the internal circulation fan 8 sucks air from the sealed chamber 4, the air enters the internal circulation fan 8 through the second air circulation vertical plate 6 and the discharge pipe 10, the air is discharged into the first air circulation vertical plate 5 through the discharge pipe 9, the air is introduced into the circulation air chamber 7 through the first air circulation vertical plate 5, the internal circulation process of the air flow in the sealed chamber 4 is realized, the air flow circulation in the sealed chamber 4 is accelerated, the air flow state in the furniture using environment is simulated, the formaldehyde release effect is improved, after the placing time is over, after the suction fan 11 is started, the generated suction force enables the air flow in the sealed chamber 4 to enter the vertical air duct 51, and enters the suction fan 11 through the discharge connecting pipe 55 and the suction pipe 12, and is sent into the convection absorption assembly 3 from the conveying pipe 13 through the suction fan 11;

the gas in the closed chamber 4 is pumped to the conveying pipe 13 to enter the inner inserting pipe 35 after internal circulation, because the length of the inner inserting pipe 35 can be inserted below the liquid level of the absorption bottle 32, after the harmful gas released by the plate material is injected into the absorption bottle 32 through the inner inserting pipe 35, the gas and the liquid impact to generate bubbles to roll, and the strong convection absorption effect is achieved, and then after the gas is discharged, a discharge port 36 provided with a valve and arranged at the bottom of the absorption bottle 32 is opened for discharging the liquid to be detected in the absorption bottle 32 after convection absorption, and subsequent result determination analysis is carried out;

whole testing arrangement is through strengthening test environment air inner loop, and the gas flow state among the simulation furniture service environment improves the release effect of formaldehyde, and the convection current absorption assembly 3 that sets up simultaneously makes the harmful gas of release and absorption liquid have strong convection current absorption effect, is favorable to the effective absorption of formaldehyde molecule in the harmful gas and absorption liquid, has guaranteed test data's authenticity, and whole device compact structure, and operation portability is high, and application promotion is effectual.

A method for testing harmful substances in furniture plates by using the testing device mainly comprises the following steps,

s1, preparing a standard calibration solution, carrying out colorimetric analysis, drawing a standard curve, and calculating the slope f of the standard curve;

s2, preparing a plate test piece, sealing the periphery of the test piece by using a formaldehyde-free aluminum adhesive tape, and enabling the measured surface area of the test piece to be not less than 450cm²；

S3, putting the plate test piece into the placing component 2, pushing the placing component 2 to extend into the test box 1, keeping the test box 1 in a sealed state, and adding 20-40mL of distilled water into the convection absorption component 3;

s4, placing the whole testing device for 24h at 20 ℃, in the placing process, initiating air flow internal circulation in the testing box (1) through the air flow internal circulation component, conveying harmful gas released by the sheet material test piece to the convection absorption component (3) for absorption after internal circulation, wherein the solution of the convection absorption component (3) is the liquid to be tested;

s5, sucking the liquid to be detected obtained by 10mLS4 into a flask, adding a detection reagent, shaking up, putting into a constant-temperature water bath kettle at 40 ℃, heating for 15min, cooling to room temperature, carrying out colorimetric detection to obtain absorbance As, and simultaneously, replacing the liquid to be detected with distilled water to carry out a blank test to determine a blank value Ab;

and S6, calculating the release amount of the harmful gas of the plate material reagent according to the formula C ═ f (As-Ab), and accurately obtaining the plate material reagent release amount of 0.01 mg/L.

The detection reagent described in S5 was 10mL of an acetylacetone solution with a volume percentage concentration of 0.4% and 10mL of an ammonium acetate solution with a mass percentage concentration of 20%.

And in the S5, the harmful gas released by the plate test piece is formaldehyde gas.

Before the sheet material test piece is placed in the placing assembly 2 in the S3, the sheet material test piece is placed under the conditions of 65% of relative humidity and 20 ℃ until the quality is constant, balance processing is carried out, interference of sheet material self factors can be eliminated, accuracy of a test result is improved, meanwhile, the water content of the sheet material test piece is kept at 6.5%, when the water content of the sheet material is high, free formaldehyde of the sheet material is easy to release, therefore, the water content of the sheet material test piece needs to be controlled, and authenticity of the test result is guaranteed.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.