CN103692536B - Method for clearing formaldehyde in artificial board - Google Patents
Method for clearing formaldehyde in artificial board Download PDFInfo
- Publication number
- CN103692536B CN103692536B CN201310682893.8A CN201310682893A CN103692536B CN 103692536 B CN103692536 B CN 103692536B CN 201310682893 A CN201310682893 A CN 201310682893A CN 103692536 B CN103692536 B CN 103692536B
- Authority
- CN
- China
- Prior art keywords
- formaldehyde
- wood
- artificial board
- acid
- based plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a method for clearing formaldehyde in an artificial board. The method comprises the steps of taking aqueous solution of organic acid or inorganic acid which is low in cost and has a smaller influence on the environment as clearing agent; carrying out soaking treatment on the artificial board in the clearing agent with the PH value being 2-6; being combined with ultrasonic wave cavitation effect, completely clearing free formaldehyde and potential formaldehyde existing in a methylol and unstable methylene chain manner in the artificial board; flushing the artificial board with tap water; carrying out ultrasonic treatment on the artificial board in the tap water. The method is simple in operation, low in cost and high in raw material utilization rate, and cannot influence the effect of adhesive of the artificial board or the mechanical strength and the physical and chemical properties of the plate. Before the artificial board is used, the formaldehyde in the artificial board is cleared first, so that the passive prevention that after the artificial board is made into a product or furniture, formaldehyde clearing agent is used for being directly sprayed onto the product or absorbing and capturing volatilized free formaldehyde on the surface of the furniture is avoided, and therefore the method has a wider market prospect.
Description
Technical field
The invention belongs to environmental protection technical field, be specifically related to the sweep-out method of formaldehyde in a kind of wood-based plate.
Background technology
Formaldehyde energy and protein bound, form formaldehyde-protein complex, make protein denaturation, occurs that eyes stung, respiratory tract seriously stimulate and the symptom such as headache clinically.Trace formaldehyde can generate dichloride methyl ether carcinogenic substance with hcl reaction in air.High-concentration formaldehyde is all toxic to nervous system, immune system, liver etc., and can cause leukaemia, is one of potential strong mutagen.
Wood-based plate comprises density board, lumber core, glued board etc., density board also claims fiberboard, be with wood fibre or other plant fiber for raw material, in water, soak after-applied Lauxite or other adhesive be suitable for, through defibrator process, mat formation, the artificial board of hot pressing.Owing to employing urea formaldehyde resin adhesive in sheet material, thus foreign gas formaldehyde can be discharged.The formaldehyde source of wood-based plate release: the free formaldehyde having neither part nor lot in reaction in the synthesis of (1) Lauxite; (2) formaldehyde of release during adhesive solidification; (3) sheet material glue-line is by the formaldehyde of acidic moisture hydrolysis generation, in Lauxite, containing a certain amount of methylol and unstable methene chain, discharges formaldehyde lentamente.This formaldehyde namely in indoor furniture will discharge the reason needing nearly 10 years completely.As can be seen here, formaldehyde generates impurity residual after urea aldehyde sets purport, as long as the impurity in removing wood-based plate adhesive, just effectively can suppress the volatilization of formaldehyde.
The method of existing purifying formaldehyde mainly contains: 1. room ventilation; 2. plant absorption method, effect is too slow, DeGrain; 3. physisorphtion, mainly utilizes some to have the species adsorbs harmful substance of adsorption capacity, reaches the object of decontamination chamber internal contamination.Porous material such as active carbon, the molecular sieve of conventional high-ratio surface make adsorbent.4. photocatalyst method, conventional catalyst is TiO
2, be subject to unglazed restriction at night, under making physical condition, formaldehyde removal efficiency is lower; 5. negative aeroion technology, mainly selects the rare mineral stone with obvious fuel factor to be raw material, joins in materials for wall, when contacting with air, the moisture in ionized air and air, produces anion, can polarize, and outwards discharge, play the effect purified air; 6. chemical method, it is short-term effective method, by chemical reagent as with the material of hydroxyl, sulfydryl or amino group and formaldehyde generation nucleophilic addition, reach the object removing formaldehyde in air, but the material itself that reaction generates has certain toxicity, and generate material with the suspension of the form of aerosol particle in atmosphere, after in suction body, comparatively large to harm, and chemical reagent itself is dangerous, cost is high, can only once use, and may secondary pollution etc. be caused.
Summary of the invention
The technical problem to be solved in the present invention is for the deficiencies in the prior art, provide a kind of simple to operate, safety and environmental protection, cost are little, except the method for formaldehyde in the high removing wood-based plate of efficiency.
Solving the problems of the technologies described above adopted technical scheme is: be first soak 2 ~ 6 hours in the acidic aqueous solution of 2 ~ 6 in pH value by wood-based plate, ultrasonic process 2 ~ 4 hours again, then tap water wood-based plate is used, more ultrasonic process 2 ~ 3 hours in running water, taking-up is dried.
Above-mentioned acidic aqueous solution is inorganic acid or the organic acid aqueous solution, can be specifically the aqueous acids such as hydrochloric acid, sulfuric acid, carbonic acid, phosphoric acid, silicic acid, nitric acid, nitrous acid, boric acid, formic acid, acetic acid, oxalic acid, citric acid, malic acid, salicylic acid, preferred hydrochloric acid, acetic acid or boron aqueous acid.
The pH value of above-mentioned acidic aqueous solution preferably 4 ~ 6, the best is 5.
The present invention is low and the acidic aqueous solution had fewer environmental impacts is scavenger with cost, simultaneously in conjunction with ultrasonic cavitation effect, thoroughly can remove by the free formaldehyde in wood-based plate and with the potential formaldehyde that methylol and unstable methene chain form exist, the method is simple to operate, cost is low, raw material availability is high, after effective removing formaldehyde, the pH value of scavenger is close to neutral, can recycle as solution scavenger, save water resource, avoid the pollution to environment, and the effect of wood-based plate adhesive can not be affected, also mechanical strength and the physical and chemical performance of sheet material can not be affected.The present invention first removes formaldehyde wherein before wood-based plate uses, and avoids after making product or furniture, re-uses formaldehyde scavenger and is directly sprayed on product or furniture surface and absorbs and catch this passive prevention of the free formaldehyde volatilized, have market prospects widely.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in more detail, but the invention is not restricted to these embodiments.
Embodiment 1
Be first soak 3 hours in the aqueous hydrochloric acid solution of 5 in pH value by wood-based plate, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 2 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 2
Be first soak 3 hours in the acetic acid aqueous solution of 5 in pH value by wood-based plate, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 2 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 3
Be first soak 3 hours in the boric acid aqueous solution of 5 in pH value by wood-based plate, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 2 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 4
Be first soak 6 hours in the aqueous sulfuric acid of 2 in pH value by wood-based plate, be the ultrasonic process 4 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 2 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 5
Be first soak 6 hours in the aqueous citric acid solution of 3 in pH value by wood-based plate, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 3 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 6
Be first soak 5 hours in the aqueous formic acid of 4 in pH value by wood-based plate, be the ultrasonic process 3 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 3 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 7
Be first soak 3 hours in the silicate aqueous solution of 5 in pH value by wood-based plate, be the ultrasonic process 3 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 3 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 8
Be first soak 2 hours in the nitrous acid aqueous solution of 6 in pH value by wood-based plate, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 2 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Embodiment 9
Be first soak 2 hours in the aqueous solution of malic acid of 5 in pH value by wood-based plate, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then tap water wood-based plate is used, ultrasonic process 2 hours in running water again, taking-up is dried, adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry wood-based plate, result display concentration of formaldehyde is no more than the regulation of 40mg/100g lower than burst size of methanal in national standard.
Acidic aqueous solution in above-described embodiment also can with pH value be 2 ~ 6 carbonate aqueous solution, phosphate aqueous solution, aqueous solution of nitric acid, the replacement such as oxalic acid aqueous solution or aqueous solution of salicylic acid; just specific embodiments of the invention more than enumerated, all distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate are all in protection scope of the present invention.
In order to prove beneficial effect of the present invention, inventors performed a large amount of development tests, concrete test situation is as follows:
Test 1: using the acetic acid aqueous solution of the different pH value of 500mL as scavenger, the wood-based plate of certain mass is soaked 3 days in scavenger, then wood-based plate is taken out, be 400mL by scavenger normal temperature decompression distillation to distillate volume, adopt the concentration of formaldehyde in iodometric determination distillate, the results are shown in Table 1.
Test 2: using the acetic acid aqueous solution of the different pH value of 500mL as scavenger, after the wood-based plate of certain mass is soaked 3 hours in scavenger, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then wood-based plate is taken out, be 400mL by scavenger normal temperature decompression distillation to distillate volume, adopt the concentration of formaldehyde in iodometric determination distillate, the results are shown in Table 2.
The concentration of formaldehyde in 1 distillate tested by table 1
| Wood-based plate quality (g) | The pH value of acetic acid aqueous solution | Concentration of formaldehyde (mg/mL) | Wood-based plate release formaldehyde amount (mg/100g) |
| 70.5440 | 7 | 0.198 | 140.34 |
| 70.5490 | 6 | 0.256 | 181.43 |
| 70.5418 | 5 | 0.327 | 231.78 |
| 70.5468 | 4 | 0.221 | 156.63 |
| 70.5471 | 3 | 0.192 | 136.08 |
| 70.5420 | 2 | 0.176 | 124.75 |
The concentration of formaldehyde in 2 distillates tested by table 2
| Wood-based plate quality (g) | The pH value of acetic acid aqueous solution | Concentration of formaldehyde (mg/mL) | Wood-based plate release formaldehyde amount (mg/100g) |
| 70.5440 | 7 | 0.478 | 338.80 |
| 70.5490 | 6 | 0.519 | 367.83 |
| 70.5418 | 5 | 0.572 | 405.43 |
| 70.5468 | 4 | 0.506 | 358.63 |
| 70.5471 | 3 | 0.570 | 403.10 |
| 70.5420 | 2 | 0.438 | 310.45 |
From table 1 and table 2, be under the condition of 2 ~ 7 in pH value, in distillate, a certain amount of formaldehyde can be detected, but adopt the method for test 1, in distillate, the concentration of formaldehyde is all lower, illustrate that the burst size of formaldehyde is less, and adopt the method for test 2, the concentration of formaldehyde in distillate is about 2 times of concentration of formaldehyde in test 1, wherein, when pH value is 5, in distillate, the concentration of formaldehyde is maximum, and namely the burst size of formaldehyde is maximum.Found by contrast, adopt the method for test 1, still have a large amount of formaldehyde not removed in wood-based plate, this part not removed formaldehyde has been no more than the regulation of 40mg/100g far beyond burst size of methanal in national standard, and tests in 2 and adopt ultrasonic process more effectively can remove formaldehyde in wood-based plate.
In order to verify the accuracy of iodometric determination result, inventor adopt acetylacetone,2,4-pentanedione AAS to pH value in test 2 be 5 and 6 acetic acid aqueous solution as scavenger time, in distillate, the concentration of formaldehyde measures, result of the test shows, using pH value be 5 acetic acid aqueous solution as scavenger time, in distillate, the concentration of formaldehyde is 0.571mg/mL, using pH value be 6 acetic acid aqueous solution as scavenger time, in distillate, the concentration of formaldehyde is 0.518mg/mL, substantially identical with iodometric determination result.
Inventor is first soak 3 hours in the acetic acid aqueous solution of 5 and 6 in 500mL pH value by being wood-based plate in the acetic acid aqueous solution of 5 and 6 after process in 500mL pH value respectively in test 2 more respectively, be the ultrasonic process 2 hours under power is 600W of the supersonic wave cleaning machine of 40kHz again by frequency, then wood-based plate is taken out, be 400mL by scavenger normal temperature decompression distillation to distillate volume, and adopt the concentration of formaldehyde in acetylacetone,2,4-pentanedione spectrophotometry distillate, the results are shown in Table 3 (mean values that result of the test is not tested for 3 times).
Concentration of formaldehyde in table 3 distillate
| Wood-based plate quality (g) | The pH value of acetic acid aqueous solution | Concentration of formaldehyde (mg/mL) | Wood-based plate release formaldehyde amount (mg/100g) |
| 70.5230 | 5 | 0.005 | 3.5 |
| 70.1060 | 6 | 0.031 | 22.1 |
From table 3, adopt the concentration of formaldehyde of the release of the wood-based plate after the method process of the test 2 middle burst size of methanal that has been up to state standards to be no more than the regulation of 40mg/100g, illustrate that the inventive method can remove the formaldehyde in wood-based plate effectively.
In order to prove beneficial effect of the present invention further, inventor adopts the mechanical strength (tensile strength) of universal testing machine to the wood-based plate after process in embodiment 1 ~ 3 to detect, and the results are shown in Table 4.
The mechanical strength (tensile strength) of table 4 wood-based plate
| Sheet material | Area (mm × mm) | Folder is apart from (cm) | Tensile strength (kgJ) |
| Wood-based plate | 20.000×3.000 | 18 | 0.6114 |
| Embodiment 1 | 20.000×3.000 | 18 | 0.6099 |
| Embodiment 2 | 20.000×3.000 | 18 | 0.6108 |
| Embodiment 3 | 20.000×3.000 | 18 | 0.6110 |
From table 4, adopt the inventive method not change except the mechanical strength of wood-based plate after formaldehyde, illustrate that the inventive method can not affect the effect of viscose glue.
Claims (3)
1. remove the method for formaldehyde in wood-based plate for one kind, it is characterized in that: be first soak 2 ~ 6 hours in the acidic aqueous solution of 4 ~ 6 in pH value by wood-based plate, ultrasonic process 2 ~ 4 hours, then uses tap water wood-based plate, ultrasonic process 2 ~ 3 hours in running water again, taking-up is dried;
Above-mentioned acidic aqueous solution be in hydrochloric acid, carbonic acid, phosphoric acid, silicic acid, nitric acid, nitrous acid, boric acid, formic acid, acetic acid, oxalic acid, citric acid, malic acid, the salicylic aqueous solution any one.
2. the method for formaldehyde in removing wood-based plate according to claim 1, is characterized in that: described acidic aqueous solution is hydrochloric acid or acetic acid or boron aqueous acid.
3. the method for formaldehyde in removing wood-based plate according to claim 1 and 2, is characterized in that: the pH value of described acidic aqueous solution is 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310682893.8A CN103692536B (en) | 2013-12-12 | 2013-12-12 | Method for clearing formaldehyde in artificial board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310682893.8A CN103692536B (en) | 2013-12-12 | 2013-12-12 | Method for clearing formaldehyde in artificial board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103692536A CN103692536A (en) | 2014-04-02 |
| CN103692536B true CN103692536B (en) | 2015-04-08 |
Family
ID=50354282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310682893.8A Active CN103692536B (en) | 2013-12-12 | 2013-12-12 | Method for clearing formaldehyde in artificial board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103692536B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224656A (en) * | 2016-12-14 | 2018-06-29 | 南京工业大学 | Ultrasonic microwave formaldehyde-removing air purification system |
| CN107599107A (en) * | 2017-09-19 | 2018-01-19 | 武汉汉慧宝驰家居有限公司 | A kind of device and method for producing Customized wardrobe |
| CN107901171A (en) * | 2017-11-02 | 2018-04-13 | 成都金川田农机制造有限公司 | A kind of method for removing formaldehyde in process |
| CN111635721B (en) * | 2020-04-29 | 2022-07-08 | 书香门地集团股份有限公司 | Modified urea-formaldehyde resin adhesive and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864815A (en) * | 2005-05-16 | 2006-11-22 | 张学琼 | An counteract for eliminating formaldehyde released from veneer log |
| CN200970821Y (en) * | 2006-09-14 | 2007-11-07 | 温彩明 | Plate treating device for removing formaldehyde |
| CN100493874C (en) * | 2007-12-26 | 2009-06-03 | 李运生 | Method of eliminate formaldehyde molecule in Wood-based Panel |
| CN102276734B (en) * | 2011-07-21 | 2012-10-31 | 北京林业大学 | Formaldehyde absorptive reagent capable of improving bonding strength of urea resins as well as preparation method and application thereof |
| CN103171014B (en) * | 2011-12-23 | 2015-04-15 | 北美枫情木家居（江苏）有限公司 | Technical wood and manufacture method thereof |
-
2013
- 2013-12-12 CN CN201310682893.8A patent/CN103692536B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103692536A (en) | 2014-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103751944B (en) | A kind of formaldehyde catching agent and preparation method thereof | |
| CN103692536B (en) | Method for clearing formaldehyde in artificial board | |
| CN101194755B (en) | Additive agent selectively reducing aldehydes matter in cigarette flue gas, production method and application thereof | |
| ES2529356T3 (en) | Procedure to reduce the emission of volatile organic compounds from wood derivatives and wood derivatives | |
| CN102350318B (en) | Formaldehyde adsorption resin and preparation method thereof | |
| CN109589779B (en) | Multifunctional bio-based formaldehyde capture agent and preparation method thereof | |
| CN101279236A (en) | Purificant for adsorbing ammonia gas and method of preparing the same | |
| CN101199912A (en) | Formaldehyde gas absorber | |
| CN203710882U (en) | Collecting and purifying device for waste gases during production of density board | |
| CN101585204A (en) | Fiberboard with formaldehyde self-absorbing function and manufacturing method thereof | |
| CN103120892A (en) | Method for purifying air by using extract obtained from tea | |
| CN109529782A (en) | The preparation method and product of the mesoporous activated carbon of rich phosphorus richness nitrogen functional group and application | |
| CN102179231B (en) | Absorbing agent for separating formaldehyde from air and preparation method thereof | |
| CN104437394B (en) | Dual-layer high-amino density plant fiber-based adsorption material and preparation method and application thereof | |
| Ayan et al. | Biosorption of dyes by natural and activated vine stem. Interaction between biosorbent and dye | |
| CN101890263A (en) | Filter material for removing aldehydes | |
| CN101250382B (en) | Method for eliminating free formaldehyde in adhesive for machining woodwork by using persulfate | |
| CN103055670B (en) | Method for managing volatile organic waste gas | |
| CN205549946U (en) | Modular spraying exhaust gas purification system | |
| CN108126661A (en) | A kind of preparation method of graphene/absorbent charcoal composite material absorption packet | |
| CN101683581A (en) | Modular formaldehyde purification treatment device | |
| CN103170237A (en) | Novel Air purifying method by fruit extraction enzyme | |
| CN105344320A (en) | Method for performing surface processing on active carbon and active carbon fiber by using alkaline liquor | |
| CN109012095B (en) | Formaldehyde scavenging agent, scavenging device and using method thereof | |
| CN106518019A (en) | High-performance ceramic membrane for treating volatile organic compounds |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Yuhu Inventor after: Zhou Xiaoling Inventor after: Chen Yashao Inventor after: Cao Jing Inventor after: Wang Wenjun Inventor before: Li Yuhu Inventor before: Zhou Xiaoling Inventor before: Chen Yashao |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI YUHU ZHOU XIAOLING CHEN YASHAO TO: LI YUHU ZHOU XIAOLING CHEN YASHAO CAO JING WANG WENJUN |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |