CN103183800A - Method for removing excessive formaldehyde in paint mist viscosity-removing agent by Fenton agent - Google Patents
Method for removing excessive formaldehyde in paint mist viscosity-removing agent by Fenton agent Download PDFInfo
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- CN103183800A CN103183800A CN2013100660562A CN201310066056A CN103183800A CN 103183800 A CN103183800 A CN 103183800A CN 2013100660562 A CN2013100660562 A CN 2013100660562A CN 201310066056 A CN201310066056 A CN 201310066056A CN 103183800 A CN103183800 A CN 103183800A
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Abstract
The invention discloses a method for removing excessive formaldehyde in a paint mist viscosity-removing agent by a Fenton agent. The method comprises the following steps: melamine and formaldehyde are added at the molar ratio of 1:(1-3), NaOH is added to regulate the pH value to be 8-9, the reaction temperature is controlled to be 50-90 DEG C, and the reaction time is controlled to be 10-120 min; the pH value of a system is regulated to be 2-3 after the reaction at the first stage is over, the reaction is continued at the temperature of 30-95 DEG C for 1-15 hours; H2O2 and Fe<2+> are respectively added when the reaction is completed, n(H2O2)/n(Fe<2+>)=4, the addition amount of H2O2 is 50-150 mmol/L, ph=2-3, the reaction temperature is controlled to be 80-95 DEG C, and the reaction time is 5-30 min. The method provided by the invention is low in cost and simple in process, the existing equipment and conditions like pH value and temperature of the reaction system are directly used and proper amount of H2O2 and Fe<2+> are added to continue the reaction for a period of time after the synthesis of the viscosity-removing agent is completed. Compared with a viscosity-removing agent with formaldehyde not removed, the viscosity removing effect of the viscosity-removing agent prepared by the invention is not remarkably affected, but the content of formaldehyde is greatly reduced, and the body health of workers is protected.
Description
Technical field
The invention belongs to the environmental pollution treatment technology field, relate in particular to a kind of Fenton of utilization reagent and eliminate the disappear method of excess formaldehyde in the stick of coating cloud.
Background technology
Along with the development of modern coating process, the spraying consumption increases day by day, has usually much can not be coated on the workpiece and become " crossing spray " coating, crosses discharge rate and reaches 25%-60%.These coating contain the volatile organic solvent that is unfavorable for HUMAN HEALTH in a large number, severe contamination surrounding environment and air.Coating falls to the ground and is difficult to cleaning, and often enters in the recirculated water.Organic solvent is taken out of outdoor because the water cycle of indoor water tank and outdoor tank flows, reduce the infringement healthy to the operating personnel.And " crossing spray " coating itself sticks to greatly on tank, pipeline and the water pump wall owing to viscosity, behind long time integration, can form bigger lacquer group and make line clogging, thus the working efficiency of the reduction recycle system.Mechanical curettage method, chemical agent adsorption-condensation partition method and biological degradation method etc. are spraying room cycle for the treatment of water several methods commonly used.What wherein be widely used is the chemical coagulation method.At present the chemical coagulation method mainly adopts and adds the stick that disappears (claim not only solution stick) and flocculation agent (but also claiming flocculation agent) in the waste water, the stick that disappears can be removed the viscosity of paint, the absorption coating cloud forms aggregated particle, reason owing to collision, aggregated particle is condensed into flco just again, makes it to adhere to the obstruction circulating line; Flocculation agent is then by absorption-charge neutrality effect, and bridge linking effect and precipitating thing volume are swept effect etc., makes first flco become block throw out, is convenient to salvage, and realizes the lacquer water sepn.
At present chemotype disappear separate in the stick sticking effect best be the polycondensate of carbamide, this product generally needs formaldehyde (also can be Paraformaldehyde 96) excessive in preparation process, formaldehyde is very big to people's harm.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of Fenton of utilization reagent to eliminate the disappear method of excess formaldehyde in the stick of coating cloud, is intended to solve the excessive problem of formaldehyde (also can be Paraformaldehyde 96) in the polycondensate of separating the best carbamide of sticking effect at present in the preparation chemotype disappears stick.
The embodiment of the invention is to realize like this, a kind of Fenton of utilization reagent is eliminated the disappear method of excess formaldehyde in the stick of coating cloud, the coating cloud that this method the adopts stick that disappears is that main raw material is prepared from trimeric cyanamide, formaldehyde, and the condition of preparation be with 1 ︰, 1～3 ratio adding in molar ratio of trimeric cyanamide, formaldehyde; Add NaOH and regulate pH=8～9, the control temperature of reaction is 50～90 ℃, and the reaction times is 10～120min; Treat after fs reaction finishes the pH value of system to be adjusted to 2～3, continue to react 1～15h down at 30-95 ℃;
In above-mentioned reaction system, add H respectively
2O
2And Fe
2+, n (H
2O
2)/n (Fe
2+)=4, H
2O
2Dosage be 50～150mmol/L, pH=2～3, temperature of reaction is controlled at 80～95 ℃, reaction times 5～30min.
Further, trimeric cyanamide, formaldehyde 1 ︰, 1～3 ratio in molar ratio add, and preferred proportion is 1 ︰ 1.8～2.5.
Further, in above-mentioned reaction system, add H respectively
2O
2And Fe
2+, H
2O
2The preferred 60～100mmol/L of dosage.
Further, the stick that disappears that this method is handled, formaldehyde residual volume≤3mg/L.
The present invention has following advantage:
The method cost that the present invention removes residual formaldehyde in the stick that disappears is low, technology is simple, need not existing installation is carried out any transformation, only need directly to utilize conditions such as the existing equipment of reaction system, pH value, temperature to add an amount of H more respectively after finishing in that the stick that disappears is synthetic
2O
2And Fe
2+Continuation reaction for some time gets final product.As a kind of high-level oxidation technology; Fenton reagent generally was used for the processing of industrial organic waste water in the past; the present invention is with the processing of Fenton reagent for the stick product removing residue formaldehyde that disappears; as long as control the add-on of molecular weight and Fenton reagent of terpolycyantoamino-formaldehyde resin well; reaction times; conditions such as temperature and pH value; can reach following effect: the stick that disappears of the present invention's preparation is compared with the stick that disappears of removing formaldehyde treated; the sticking effect that disappears is not subjected to obvious influence; and formaldehyde content reduces greatly; having protected the healthy of production and later stage paint line staff, is the technology of environmental protection.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Example 1
With dissolving in 1 part of trimeric cyanamide, 150 parts of water of 2 parts of formaldehyde addings, add NaOH and regulate pH=8～9, the control temperature of reaction is 70 ℃, the reaction times is 40min; With hydrochloric acid the pH value of system is adjusted to 2～3, continues at 70 ℃ of reaction 3h down; Add H
2O
21 part, Fe
2+4 parts, control pH=3, at 90 ℃ of reaction 15min, stick must disappear.
Get NaOH solution and add and to have in the water white Plastic Bottle of 1L tap water, regulate pH and become weakly alkaline, add the 1mL stick that disappears and shake up, drip 10 with suction pipe or needle tubing surplus oil dripping lacquer (alkyd varnish), build bottle cap, firmly fluctuated for tens seconds.Add the cationic-type polyacrylamide aqueous solution of 8mL1%, build bottle cap, firmly fluctuated for tens seconds, leave standstill, the paint particles that disappears after gluing namely condenses the come-up caking, and the water quality behind the separation lacquer slag is as clear as crystal.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. one kind is utilized Fenton reagent to eliminate the disappear method of excess formaldehyde in the stick of coating cloud, it is characterized in that, the coating cloud that this method the adopts stick that disappears is that main raw material is prepared from trimeric cyanamide, formaldehyde, and the condition of preparation be with 1 ︰, 1～3 ratio adding in molar ratio of trimeric cyanamide, formaldehyde; Add NaOH and regulate pH=8～9, the control temperature of reaction is 50～90 ℃, and the reaction times is 10～120min; Treat after fs reaction finishes the pH value of system to be adjusted to 2～3, continue to react 1～15h down at 30～95 ℃;
After reaction is finished, in system, add H respectively
2O
2And Fe
2+, n (H
2O
2)/n (Fe
2+)=4, H
2O
2Dosage be 50～150mmol/L, pH=2～3, temperature of reaction is controlled at 80～95 ℃, reaction times 5～30min.
2. the Fenton of utilization reagent as claimed in claim 1 is eliminated the disappear method of excess formaldehyde in the stick of coating cloud, it is characterized in that trimeric cyanamide, formaldehyde 1 ︰, 1～3 ratio in molar ratio add, and preferred proportion is 1 ︰ 1.8～2.5.
3. the Fenton of utilization reagent as claimed in claim 1 is eliminated the disappear method of excess formaldehyde in the stick of coating cloud, it is characterized in that, adds H in above-mentioned reaction system respectively
2O
2And Fe
2+, H
2O
2The preferred 60～100mmol/L of dosage.
4. the Fenton of utilization reagent as claimed in claim 1 is eliminated the disappear method of excess formaldehyde in the stick of coating cloud, it is characterized in that the stick that disappears that this method is handled, formaldehyde residual volume≤3mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310066056.2A CN103183800B (en) | 2013-03-01 | 2013-03-01 | A kind ofly utilize Fenton reagent to eliminate coating cloud to disappear the method for excess formaldehyde in stick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310066056.2A CN103183800B (en) | 2013-03-01 | 2013-03-01 | A kind ofly utilize Fenton reagent to eliminate coating cloud to disappear the method for excess formaldehyde in stick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103183800A true CN103183800A (en) | 2013-07-03 |
| CN103183800B CN103183800B (en) | 2016-01-13 |
Family
ID=48675267
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310066056.2A Expired - Fee Related CN103183800B (en) | 2013-03-01 | 2013-03-01 | A kind ofly utilize Fenton reagent to eliminate coating cloud to disappear the method for excess formaldehyde in stick |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848489A (en) * | 2014-03-21 | 2014-06-11 | 武汉理工大学 | Novel efficient paint mist flocculant and preparation method thereof |
| CN103910423A (en) * | 2014-04-23 | 2014-07-09 | 武汉理工大学 | Polysilicic acid modified melamine coagulant for paint fog and preparation method thereof |
| CN108545802A (en) * | 2018-04-12 | 2018-09-18 | 东南大学 | A kind of melamine purification skid mounted equipment |
-
2013
- 2013-03-01 CN CN201310066056.2A patent/CN103183800B/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 刘明 等: "Fe2+/H2O2催化氧化脲醛树脂胶中游离甲醛及其对性能的影响", 《化工建材》 * |
| 夏仁义: "三聚氰胺甲醛树脂液的制备与使用", 《湖南造纸》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848489A (en) * | 2014-03-21 | 2014-06-11 | 武汉理工大学 | Novel efficient paint mist flocculant and preparation method thereof |
| CN103848489B (en) * | 2014-03-21 | 2015-07-22 | 武汉理工大学 | Novel efficient paint mist flocculant and preparation method thereof |
| CN103910423A (en) * | 2014-04-23 | 2014-07-09 | 武汉理工大学 | Polysilicic acid modified melamine coagulant for paint fog and preparation method thereof |
| CN103910423B (en) * | 2014-04-23 | 2016-02-03 | 武汉理工大学 | A kind of polysilicon acid modified cyanurotriamide lacquer mist coagulant and preparation method thereof |
| CN108545802A (en) * | 2018-04-12 | 2018-09-18 | 东南大学 | A kind of melamine purification skid mounted equipment |
| CN108545802B (en) * | 2018-04-12 | 2021-11-05 | 东南大学 | Melamine purification skid-mounted equipment |
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| Publication number | Publication date |
|---|---|
| CN103183800B (en) | 2016-01-13 |
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