CN104383657A - Preparation method of formaldehyde scavenging agent for urea-formaldehyde adhesive artificial board - Google Patents
Preparation method of formaldehyde scavenging agent for urea-formaldehyde adhesive artificial board Download PDFInfo
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- CN104383657A CN104383657A CN201410683830.9A CN201410683830A CN104383657A CN 104383657 A CN104383657 A CN 104383657A CN 201410683830 A CN201410683830 A CN 201410683830A CN 104383657 A CN104383657 A CN 104383657A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/20—Organic substances
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Abstract
The invention discloses a preparation method of a formaldehyde scavenging agent for a urea-formaldehyde adhesive artificial board. The preparation method is used for preparing the formaldehyde scavenging agent by mixing 10-40% of ethylene urea, 20-30% of a film-forming agent, 0.1-10% of a penetrant, 0.1-10% of an accelerant and 15-60% of solvent water; the prepared formaldehyde scavenging agent is a film-forming material suitable for covering the artificial board in a brush application, spraying or roller coating manner, and is capable of scavenging free formaldehyde in the artificial board and also effectively inhibiting the spilling of the free formaldehyde, wherein ethylene urea is an active ingredient for scavenging the free formaldehyde in the artificial board, and can be obtained from ethylenediamine, urea and water by use of simple operations; the rest ingredients are dissolved in water respectively; the actual operation process is quite simple.
Description
Technical field
The invention belongs to formaldehyde removing field, specifically, is the preparation method of urea glue wood-based plate formaldehyde scavenger.
Background technology
Wood-based plate is the important composition base material of existing ornament materials, in its production and application process, the burst size of formaldehyde has become a problem be day by day concerned, as everyone knows, need to add the adhesive containing formaldehyde in the process manufacturing wood-based plate, as urea-formaldehyde glue etc., and according to statistics display, domestic wood-based plate more than 90% all adopts urea-formaldehyde glue to suppress, thus no doubt can produce free formaldehyde when applying, being applied in Furniture manufacture or the application of other sheet material and often certain impact being produced on human body.In actual application, free formaldehyde Producing reason comprises the following aspects:
(1) insufficient and remaining free formaldehyde is reacted during resins synthesis;
(2) resins synthesis participates in reaction formaldehyde, owing to defining unstable group, heat press greatly with hard board use procedure in discharge again the formaldehyde combined;
(3) in board making process, owing to adding solid agent, under electrolytical effect, around resin micelle, the absorption ion layer of established tool stability is destroyed, thus discharges formaldehyde and cause hardening of resin.
To volatilize the injury that human body is caused for eliminating wood-based plate Free-formaldehyde, the greenization of wood-based plate is produced and has been become the crucial part affecting wood-based plate market, the existing safe wood-based plate occurring two types on the market, one is, as patent document CN1404891A(artificial board formaldehyde remover and preparation method, 2003.03.26) a kind of formaldehyde eliminating agent being applicable to wood-based panel industry production post processing recorded, this formaldehyde eliminating agent is for being coated in wood-based plate, enter after infiltration in wood-based plate and react with free formaldehyde wherein, to reach the effect eliminating free formaldehyde, another kind is, as patent document CN1739821A(ethylene carbamido amino derivative as formaldehyde eliminator, 2006.03.01) formaldehyde eliminating agent being applicable to add in amino resins recorded, with urea-formaldehyde glue etc. with the use of, to reach the object of removing urea-formaldehyde glue Free-formaldehyde.
In actual use, the volatilizes of free formaldehyde generally can continue 10 ~ 15 years, in above-mentioned two kinds of formaldehyde scavengers, the active ingredient added is limited, once after effect inefficacy, the free formaldehyde in wood-based plate still can discharge out in a large number, cause the pollution of room air, in addition, when formaldehyde scavenger and formaldehyde generation incomplete reaction, also may generate other noxious materials and cause secondary pollution.
Summary of the invention
The object of the present invention is to provide the preparation method of urea glue wood-based plate formaldehyde scavenger; this preparation method provide a kind ofly be applicable to brush, spraying or roller applications be coated on the top layer of wood-based plate and form the formaldehyde scavenger of diaphragm; the removing of wood-based plate Free-formaldehyde can not only be realized; also effectively can suppress the spilling of free formaldehyde; wherein; ethyleneurea is the active ingredient removing wood-based plate Free-formaldehyde; adopt ethylenediamine, urea, water can complete through simple operations; all the other compositions are then separated with water-soluble respectively, and actual mechanical process is very simple.
The present invention is achieved through the following technical solutions: the preparation method of urea glue wood-based plate formaldehyde scavenger, this formaldehyde scavenger overcomes existing part formaldehyde scavenger product because of, poor in timeliness not high to free formaldehyde clearance and the secondary pollution phenomenon a series of defects causing wood-based panel product poor quality such as serious, propose a kind of can at the formaldehyde scavenger of wood-based plate top layer film forming, that is: described formaldehyde scavenger is the filmogen adopting brushing, spraying or roller applications to be covered in wood-based plate top layer, and the preparation process of this formaldehyde scavenger is as follows:
(1) get the raw materials ready: prepare raw material by following proportioning:
By weight percentage, ethyleneurea: 10 ~ 40%, film forming agent: 20 ~ 30%, bleeding agent: 0.1 ~ 10%, promoter: 0.1 ~ 10%, aqueous solvent: 15 ~ 60%;
(2) the ethyleneurea aqueous solution is prepared:
In ratio step (1) Suo Shi, ethyleneurea and aqueous solvent are added in consersion unit, stirs and mix, obtain the ethyleneurea aqueous solution;
(3) formaldehyde scavenger is prepared:
In ratio step (1) Suo Shi, successively bleeding agent and promoter are added in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 1 ~ 3h at the temperature of 60 ~ 70 DEG C after, acquisition formaldehyde scavenger.
Through facts have proved in a large number, ethyleneurea is effective aldehydes removal composition, and the efficiency of its aldehydes removal is mainly that the concentration of ethyleneurea controls, in actual application of the present invention, ethyleneurea to wood-based plate internal penetration under the effect of bleeding agent, can realize the elimination of its Free-formaldehyde; Meanwhile, by the effect of film forming agent, formaldehyde scavenger also can form closely knit membrane structure on wood-based plate top layer, free formaldehyde in wood-based plate is when overflowing wood-based plate surface, the suppression of this membrane structure can be subject to, realize the greenization of wood-based plate further, described ethyleneurea by mol ratio be the ethylenediamine of 1.5:1:0.5, urea, water adds in reactor, heating and melting also stirs, after obtaining ethyleneurea paste, add water-soluble solution again, and after filtration, dry after obtain, described ethyleneurea is white crystalline.
For better realizing the preparation of ethyleneurea, in the present invention, described ethylenediamine, urea, water heating-up temperature is in the reactor 110 ~ 240 DEG C, and the reaction time is 3 ~ 4h.
In the process preparing ethyleneurea, after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 150 ~ 180 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
Film forming agent effectively can promote that in formaldehyde scavenger, each composition solidifies and film forming of condensing, on the one hand, the brushing of formaldehyde scavenger, spraying or roller coating can be convenient to use, on the other hand, the spilling of wood-based plate Free-formaldehyde can be suppressed, in the present invention, described film forming agent comprises formamide film forming agent, polyvinyl alcohol film forming agent, methylene acid-methacrylic acid copolymer or sodium alginate film forming agent, described film forming agent is applicable to the use of all kinds of wood-based plate, and without pernicious gas volatilization in use procedure, economic environmental protection.
The effect of bleeding agent is to promote that in formaldehyde scavenger, ethyleneurea is to wood-based plate internal penetration, to realize the removing of wood-based plate Free-formaldehyde, adopt high-efficient penetrant, as: as described in bleeding agent be nonionic penetrant, comprise JFC bleeding agent, JFC-1 bleeding agent, JFC-2 bleeding agent or JFC-E bleeding agent.
In the present invention, described promoter comprises the mixture of one or more compositions in magnesium sulfate, calcium sulfate, magnesium chloride or calcium chloride, its role is to: play catalytic action when ethyleneurea and free formaldehyde react, to improve the elimination factor of free formaldehyde, be proven, its result of use is good.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) formaldehyde scavenger that the present invention obtains overcomes the defect of existing formaldehyde scavenger product, propose a kind of brushing, spraying or roller applications of being applicable to be coated on wood-based plate top layer and form the formaldehyde eliminating agent of closely knit membrane structure, adopt film forming agent that each composition in formaldehyde scavenger is solidified and film forming of condensing, on the one hand, the brushing of formaldehyde scavenger, spraying or roller coating can be convenient to use, on the other hand, the spilling of wood-based plate Free-formaldehyde can be suppressed, improve the clearance rate of wood-based plate Free-formaldehyde and ageing.
(2) the present invention adopts high-efficient penetrant, its role is to: promote that in formaldehyde scavenger, ethyleneurea is to wood-based plate internal penetration, to realize the removing of wood-based plate Free-formaldehyde.
(3) the present invention adopts the effect of promoter to be play catalytic action when ethyleneurea and free formaldehyde react, and to improve the elimination factor of free formaldehyde, be proven, its result of use is good.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1:
The present invention proposes the preparation method of urea glue wood-based plate formaldehyde scavenger, the formaldehyde scavenger prepared by the method is adopt brushing, spraying or roller applications are covered in the filmogen on wood-based plate top layer, the diaphragm that can not only be formed on wood-based plate top layer, prevent the spilling of free formaldehyde, its active ingredient ethyleneurea also can enter the inside of wood-based plate under the effect of bleeding agent, react with free formaldehyde wherein, and reach the object eliminating wood-based plate Free-formaldehyde, certainly, to better implement the present invention, in actual use, also promoter is added with in formaldehyde scavenger, its object is to: play catalytic action when ethyleneurea and free formaldehyde react, effectively can improve the elimination factor of free formaldehyde, be proven, its result of use is good.
By weight percentage, the formaldehyde scavenger that the present embodiment relates to includes following component:
Ethyleneurea: 10%;
Film forming agent: 20%, can adopt formamide film forming agent;
Bleeding agent: 10%, can adopt JFC bleeding agent;
Promoter: 0.1%, can adopt magnesium sulfate;
Aqueous solvent: 59.9%.
The preparation process of above-mentioned formaldehyde scavenger is as follows:
(1) first, the ethylenediamine of proper proportion, urea, water is adopted to prepare ethyleneurea:
Be the ethylenediamine of 1.5:1:0.5 by mol ratio, urea, water adds in reactor respectively, heat at the temperature of 110 DEG C and stir, the control reaction time is 3h, and after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 150 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
(2) secondly, the ethyleneurea aqueous solution is prepared:
Respectively ethyleneurea obtained for step (1) and aqueous solvent are added in consersion unit in proportion, stir and mix, obtain the ethyleneurea aqueous solution.
(3) last, add bleeding agent, promoter and film forming agent successively, obtained formaldehyde scavenger product:
Successively bleeding agent and promoter are added in proportion in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 1h at the temperature of 60 DEG C after, acquisition formaldehyde scavenger product.
Formaldehyde scavenger product brushing above-mentioned steps obtained is on the top layer of wood-based plate, and painting amount is 15g/m
2, after having brushed, after wood-based plate at room temperature air-dry placement 20h, measure the burst size of methanal of wood-based plate, result is as shown in table 1:
Table 1
| Sample | The free formaldehyde content (mg/L) of wood-based plate before brushing formaldehyde scavenger product | The free formaldehyde content (mg/L) of wood-based plate after brushing formaldehyde scavenger product | The clearance (%) of free formaldehyde |
| Embodiment 1 | 1.88 | 0.052 | 97.2 |
China's civil buildings room air standard specifies that the content of free formaldehyde should be less than 0.08 mg/L, and the content of sample Free-formaldehyde shown in upper table is 0.056mg/L, meets national regulation.
Embodiment 2:
By weight percentage, the formaldehyde scavenger that the present embodiment relates to includes following component:
Ethyleneurea: 40%;
Film forming agent: 30%, can adopt polyvinyl alcohol film forming agent;
Bleeding agent: 0.1%, can adopt JFC-1 bleeding agent;
Promoter: 10%, can adopt the mixture of calcium sulfate and magnesium chloride composition, calcium sulfate: the mass ratio of magnesium chloride is 1:1;
Aqueous solvent: 19.9%.
The preparation process of above-mentioned formaldehyde scavenger is as follows:
(1) first, the ethylenediamine of proper proportion, urea, water is adopted to prepare ethyleneurea:
Be the ethylenediamine of 1.5:1:0.5 by mol ratio, urea, water adds in reactor respectively, heat at the temperature of 240 DEG C and stir, the control reaction time is 4h, and after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 180 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
(2) secondly, the ethyleneurea aqueous solution is prepared:
Respectively ethyleneurea obtained for step (1) and aqueous solvent are added in consersion unit in proportion, stir and mix, obtain the ethyleneurea aqueous solution.
(3) last, add bleeding agent, promoter and film forming agent successively, obtained formaldehyde scavenger product:
Successively bleeding agent and promoter are added in proportion in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 3h at the temperature of 70 DEG C after, acquisition formaldehyde scavenger product.
Formaldehyde scavenger product brushing above-mentioned steps obtained is on the top layer of wood-based plate, and painting amount is 28g/m
2, after having brushed, after wood-based plate at room temperature air-dry placement 24h, measure the burst size of methanal of wood-based plate, result is as shown in table 2:
Table 2
| Sample | The free formaldehyde content (mg/L) of wood-based plate before brushing formaldehyde scavenger product | The free formaldehyde content (mg/L) of wood-based plate after brushing formaldehyde scavenger product | The clearance (%) of free formaldehyde |
| Embodiment 2 | 2.85 | 0.057 | 98.0 |
China's civil buildings room air standard specifies that the content of free formaldehyde should be less than 0.08 mg/L, and the content of sample Free-formaldehyde shown in upper table is 0.057mg/L, meets national regulation.
Embodiment 3:
By weight percentage, the formaldehyde scavenger that the present embodiment relates to includes following component:
Ethyleneurea: 30%;
Film forming agent: 25%, can adopt sodium alginate film forming agent;
Bleeding agent: 5%, can adopt JFC-E bleeding agent;
Promoter: 5%, can adopt the mixture that magnesium sulfate, calcium sulfate and calcium chloride form, wherein, and magnesium sulfate: calcium sulfate: the mass ratio of calcium chloride is 1:1:0.5;
Aqueous solvent: 35%.
The preparation process of above-mentioned formaldehyde scavenger is as follows:
(1) first, the ethylenediamine of proper proportion, urea, water is adopted to prepare ethyleneurea:
Be the ethylenediamine of 1.5:1:0.5 by mol ratio, urea, water adds in reactor respectively, heat at the temperature of 180 DEG C and stir, the control reaction time is 3.5h, and after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 165 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
(2) secondly, the ethyleneurea aqueous solution is prepared:
Respectively ethyleneurea obtained for step (1) and aqueous solvent are added in consersion unit in proportion, stir and mix, obtain the ethyleneurea aqueous solution.
(3) last, add bleeding agent, promoter and film forming agent successively, obtained formaldehyde scavenger product:
Successively bleeding agent and promoter are added in proportion in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 1.5h at the temperature of 65 DEG C after, acquisition formaldehyde scavenger product.
Formaldehyde scavenger product roller coating above-mentioned steps obtained is on the top layer of wood-based plate, and painting amount is 25g/m
2, after roller coating completes, after wood-based plate at room temperature air-dry placement 24h, measure the burst size of methanal of wood-based plate, result is as shown in table 3:
Table 3
| Sample | The free formaldehyde content (mg/L) of wood-based plate before roller coating formaldehyde scavenger product | The free formaldehyde content (mg/L) of wood-based plate after roller coating formaldehyde scavenger product | The clearance (%) of free formaldehyde |
| Embodiment 3 | 1.95 | 0.046 | 97.6 |
China's civil buildings room air standard specifies that the content of free formaldehyde should be less than 0.08 mg/L, and the content of sample Free-formaldehyde shown in upper table is 0.046mg/L, meets national regulation.
Embodiment 4:
By weight percentage, the formaldehyde scavenger that the present embodiment relates to includes following component:
Ethyleneurea: 13%;
Film forming agent: 20%, can adopt sodium alginate film forming agent;
Bleeding agent: 4%, can adopt JFC-E bleeding agent;
Promoter: 3%, can adopt calcium sulfate;
Aqueous solvent: 60%.
The preparation process of above-mentioned formaldehyde scavenger is as follows:
(1) first, the ethylenediamine of proper proportion, urea, water is adopted to prepare ethyleneurea:
Be the ethylenediamine of 1.5:1:0.5 by mol ratio, urea, water adds in reactor respectively, heat at the temperature of 150 DEG C and stir, the control reaction time is 3h, and after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 160 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
(2) secondly, the ethyleneurea aqueous solution is prepared:
Respectively ethyleneurea obtained for step (1) and aqueous solvent are added in consersion unit in proportion, stir and mix, obtain the ethyleneurea aqueous solution.
(3) last, add bleeding agent, promoter and film forming agent successively, obtained formaldehyde scavenger product:
Successively bleeding agent and promoter are added in proportion in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 3h at the temperature of 70 DEG C after, acquisition formaldehyde scavenger product.
Formaldehyde scavenger product above-mentioned steps obtained is sprayed on the top layer of wood-based plate, and painting amount is 23g/m
2, after having sprayed, after wood-based plate at room temperature air-dry placement 24h, measure the burst size of methanal of wood-based plate, result is as shown in table 4:
Table 4
| Sample | The free formaldehyde content (mg/L) of wood-based plate before spraying formaldehyde scavenger product | The free formaldehyde content (mg/L) of wood-based plate after spraying formaldehyde scavenger product | The clearance (%) of free formaldehyde |
| Embodiment 4 | 2.00 | 0.038 | 98.1 |
China's civil buildings room air standard specifies that the content of free formaldehyde should be less than 0.08 mg/L, and the content of sample Free-formaldehyde shown in upper table is 0.038mg/L, meets national regulation.
Embodiment 5:
By weight percentage, the formaldehyde scavenger that the present embodiment relates to includes following component:
Ethyleneurea: 40%;
Film forming agent: 25%, can adopt methylene acid-methacrylic acid copolymer;
Bleeding agent: 10%, can adopt JFC bleeding agent;
Promoter: 10%, can adopt the mixture that magnesium sulfate, calcium sulfate and calcium chloride form, wherein, and magnesium sulfate: calcium sulfate: the mass ratio of calcium chloride is 1:0.5:2;
Aqueous solvent: 15%.
The preparation process of above-mentioned formaldehyde scavenger is as follows:
(1) first, the ethylenediamine of proper proportion, urea, water is adopted to prepare ethyleneurea:
Be the ethylenediamine of 1.5:1:0.5 by mol ratio, urea, water adds in reactor respectively, heat at the temperature of 200 DEG C and stir, the control reaction time is 3h, and after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 170 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
(2) secondly, the ethyleneurea aqueous solution is prepared:
Respectively ethyleneurea obtained for step (1) and aqueous solvent are added in consersion unit in proportion, stir and mix, obtain the ethyleneurea aqueous solution.
(3) last, add bleeding agent, promoter and film forming agent successively, obtained formaldehyde scavenger product:
Successively bleeding agent and promoter are added in proportion in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 2h at the temperature of 62 DEG C after, acquisition formaldehyde scavenger product.
Formaldehyde scavenger product brushing above-mentioned steps obtained is on the top layer of wood-based plate, and painting amount is 26g/m
2, after having brushed, after wood-based plate at room temperature air-dry placement 22h, measure the burst size of methanal of wood-based plate, result is as shown in table 5:
Table 5
| Sample | The free formaldehyde content (mg/L) of wood-based plate before brushing formaldehyde scavenger product | The free formaldehyde content (mg/L) of wood-based plate after brushing formaldehyde scavenger product | The clearance (%) of free formaldehyde |
| Embodiment 5 | 2.05 | 0.032 | 98.4 |
China's civil buildings room air standard specifies that the content of free formaldehyde should be less than 0.08 mg/L, and the content of sample Free-formaldehyde shown in upper table is 0.032mg/L, meets national regulation.
The above is only preferred embodiment of the present invention, and not do any pro forma restriction to the present invention, every any simple modification, equivalent variations done above embodiment according to technical spirit of the present invention, all falls within protection scope of the present invention.
Claims (7)
1. the preparation method of urea glue wood-based plate formaldehyde scavenger, is characterized in that: described formaldehyde scavenger is the filmogen adopting brushing, spraying or roller applications to be covered in wood-based plate top layer, and the preparation process of this formaldehyde scavenger is as follows:
(1) get the raw materials ready: prepare raw material by following proportioning:
By weight percentage, ethyleneurea: 10 ~ 40%, film forming agent: 20 ~ 30%, bleeding agent: 0.1 ~ 10%, promoter: 0.1 ~ 10%, aqueous solvent: 15 ~ 60%;
(2) the ethyleneurea aqueous solution is prepared:
In ratio step (1) Suo Shi, ethyleneurea and aqueous solvent are added in consersion unit, stirs and mix, obtain the ethyleneurea aqueous solution;
(3) formaldehyde scavenger is prepared:
In ratio step (1) Suo Shi, successively bleeding agent and promoter are added in the obtained ethyleneurea aqueous solution of step (2), to stir and after mixing, then add film forming agent in proportion, stir 1 ~ 3h at the temperature of 60 ~ 70 DEG C after, acquisition formaldehyde scavenger.
2. the preparation method of urea glue wood-based plate formaldehyde scavenger according to claim 1, it is characterized in that: described ethyleneurea by mol ratio be the ethylenediamine of 1.5:1:0.5, urea, water adds in reactor, heating and melting also stirs, after obtaining ethyleneurea paste, add water-soluble solution again, and after filtration, dry after obtain, described ethyleneurea is white crystalline.
3. the preparation method of urea glue wood-based plate formaldehyde scavenger according to claim 2, it is characterized in that: described ethylenediamine, urea, water heating-up temperature is in the reactor 110 ~ 240 DEG C, the reaction time is 3 ~ 4h.
4. the preparation method of urea glue wood-based plate formaldehyde scavenger according to claim 2, it is characterized in that: after obtaining ethyleneurea paste, continuous heating stirs, after ethyleneurea paste dissolves, be cooled to 150 ~ 180 DEG C, then add water-soluble solution, and keep temperature > 100 DEG C, after the hydrolysis of ethyleneurea dissolved matter, more after filtration, obtain the ethyleneurea of white crystalline after drying.
5. the preparation method of urea glue wood-based plate formaldehyde scavenger according to claim 1, is characterized in that: described film forming agent comprises formamide film forming agent, polyvinyl alcohol film forming agent, methylene acid-methacrylic acid copolymer or sodium alginate film forming agent.
6. the preparation method of urea glue wood-based plate formaldehyde scavenger according to claim 1, is characterized in that: described bleeding agent is nonionic penetrant, comprises JFC bleeding agent, JFC-1 bleeding agent, JFC-2 bleeding agent or JFC-E bleeding agent.
7. the preparation method of urea glue wood-based plate formaldehyde scavenger according to claim 1, is characterized in that: described promoter comprises the mixture of one or more compositions in magnesium sulfate, calcium sulfate, magnesium chloride or calcium chloride.
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| CN111944197A (en) * | 2020-08-31 | 2020-11-17 | 四川华象林产工业有限公司 | Method for decomposing waste urea-formaldehyde resin adhesive |
| CN111944197B (en) * | 2020-08-31 | 2023-03-24 | 四川华象林产工业有限公司 | Method for decomposing waste urea-formaldehyde resin adhesive |
| CN114768502A (en) * | 2022-03-18 | 2022-07-22 | 河北登尚科技有限公司 | Aldehyde removing agent |
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Application publication date: 20150304 |