CN103007898A - Preparation method and use method of modified bentonite environment-friendly formaldehyde removing agent - Google Patents
Preparation method and use method of modified bentonite environment-friendly formaldehyde removing agent Download PDFInfo
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- CN103007898A CN103007898A CN2012105920472A CN201210592047A CN103007898A CN 103007898 A CN103007898 A CN 103007898A CN 2012105920472 A CN2012105920472 A CN 2012105920472A CN 201210592047 A CN201210592047 A CN 201210592047A CN 103007898 A CN103007898 A CN 103007898A
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Abstract
The invention relates to a modified bentonite environment-friendly formaldehyde removing agent for removing free formaldehyde in urea-formaldehyde glue. A preparation method of the formaldehyde removing agent comprises the following steps of: in parts by weight, crushing 100 parts of calcium bentonite, screening the crushed calcium bentonite through a 200-mesh sieve, adding 2 to 3.5 parts of sodium carbonate into the screened calcium bentonite, mixing uniformly, spraying water of which the weight accounts for 10 percent of that of the calcium bentonite, fully mixing uniformly, sealing the mixture for 24 hours for sodication reaction, and air-drying naturally; and adding 0.5 to 2.5 parts of hydroxyethyl cellulose, 1.5 to 2.5 parts of ammonia chloride and 2.5 to 5 parts of sodium nitrite into 100 parts of a raw material subjected to sodication, crushing the mixture and stirring for 3 hours to obtain powder, and screening the powder through a 300-mesh sieve to obtain formaldehyde removing powder. A use method of the modified bentonite environment-friendly formaldehyde removing agent comprises the following steps of: in parts by weight, adding 10 parts of water into 10 parts of the formaldehyde removing agent, stirring at a high speed for 40 minutes, adding 10 parts of a suspension of the mixture into 90 parts of the urea-formaldehyde glue, raising the temperature to 50 DEG C, fully stirring for 30 minutes, standing for more than 24 hours, and thus fully adsorbing the formaldehyde in the urea-formaldehyde glue. The modified bentonite environment-friendly formaldehyde removing agent has good adsorption effect on the formaldehyde, and cannot influence the performance of the urea-formaldehyde glue.
Description
Technical field
The present invention relates to remove the aldehyde remover of urea-formaldehyde glue Free-formaldehyde, specifically a kind of modified alta-mud environmental protection aldehyde remover preparation method and using method.
Background technology
Urea-formaldehyde glue is a kind of adhesive with low cost, widely used, mainly for the production of artificial board.But the existing higher weakness of urea-formaldehyde glue ubiquity free formaldehyde content, the urea-formaldehyde glue of high free formaldehyde content is the primary pollution source of indoor pollution.At present, eliminating the formaldehyde method has two kinds of forms, and the one, chemical null method, another kind are the physics null methods.The chemistry null method namely adopts various formaldehyde catching agents, destroys the molecular structure of the pernicious gases such as formaldehyde, benzene, and then it is progressively removed, and finally reaches the purpose of aldehydes removal.Such as Fenton oxidizing process, photocatalytic oxidation etc., there are the problems such as secondary pollution, photochemical catalyst cost costliness or operating cost height in these methods.It is to adopt active carbon carbon or other to have than in the material absorbed air of bigger serface or the suspension Free-formaldehyde that physics is eliminated rule, thereby reaches the aldehydes removal purpose.The physics null method has the advantages such as simple to operate, with low cost, asepsis environment-protecting, security height by contrast.
Bentonite has the abundant physical characteristic such as water swellability, dispersiveness, caking property, plasticity, colloidality, rheological characteristic, thixotropy, alkali exchangeability (cation exchange), adsorptivity, fire resistance, lubricity.But natural montmorillonite is generally take calcium-base bentonite as main, physico-chemical property is not very desirable, is applied to the removal of urea aldehyde Free-formaldehyde, can't reach gratifying effect, therefore need deep processing just can be further improved, in order to be applied to widely the aldehydes removal field.
Summary of the invention
The object of the invention is to provide a kind of modified alta-mud environmental protection aldehyde remover preparation method and using method, do not change the urea-formaldehyde glue serviceability after in urea-formaldehyde glue, adding this product, when removing the virgin rubber Free-formaldehyde, reach and improve virgin rubber stability and adhesion strength, and reduce the effect of cost.
The technical solution used in the present invention is:
A kind of modified alta-mud environmental protection aldehyde remover preparation method, it carries out in the steps below:
A. raw material sodium: press calcium bentonite: the ratio of weight and number of sodium carbonate=100:2-3.5, take by weighing respectively calcium bentonite and sodium carbonate, calcium bentonite is pulverized rear 200 mesh sieves of crossing, then add the sodium carbonate mixing, compound is tiled in dry place, sprays the moisture that accounts for calcium bentonite weight 10% in mix surface, and abundant mixing, sealing 24h carries out natridization reaction, afterwards natural air drying in hermetically sealed can;
B. mechanical agitation: meter by weight, take by weighing 100 parts of raw materials after the sodium, the hydroxyethylcellulose, the ammonium chloride of 1.5-2.5 part and the natrium nitrosum of 2.5-5 part that add 0.5-2.5 part, mechanical agitation 3h obtains powder in the efficient pulverizing device;
C. sieve: step b gained powder is crossed 300 mesh sieves be modified alta-mud environmental protection aldehyde remover pulvis.
Further, among the step b, also add 2-4 part sodium pyrophosphate; After the cooling of step b gained powder, add 1-3 part NH
4HCO
3, stirring at low speed 30min.
A kind of above-mentioned modified alta-mud environmental protection aldehyde remover using method, it carries out as follows:
Count by weight, take by weighing 10 parts of modified alta-mud environmental protection aldehyde remover pulvis, add 10 parts of running water, high-speed stirred 40 minutes takes by weighing 10 parts of its suspension again, adds in 90 parts of urea-formaldehyde glues, be heated to 50 ℃, fully stirred 30 minutes, place more than the 24h, formaldehyde can fully be adsorbed in the urea-formaldehyde glue.
The modified alta-mud PARA FORMALDEHYDE PRILLS(91,95) has better adsorption effect among the present invention, and does not affect its performance, and reason is as follows:
The main component of urea-formaldehyde glue is Lauxite or UF resin, mainly synthesizes the UF resin by urea element and addition reaction and the polycondensation reaction of formaldehyde in the production.The initial stage resin that forms under heating or acid condition, can continue methylol to occur each other or with another amido on the further condensation reaction of hydrogen, form the high resin of the degree of cross linking.Simultaneously since in key or between key forming section ehter bond or methine key can discharge formaldehyde or water.Therefore, have inevitably formaldehyde in the urea-formaldehyde glue.
Bentonitic main component is montmorillonite, and it mainly consists of 2:1 type layer structure by two-layer silicon-oxy tetrahedron folder one deck alumina octahedral, and it forms structural formula is (Na, Ca)
0.33(A1, Mg) Si
4O
10(OH) nH
2O.In tetrahedron and octahedron, high-valence cationic can be by other at a low price cation replacement.Such as the Si in the silicon-oxy tetrahedron
4+Can be by Al
3+, Fe
3+Deng displacement, the Al in the alumina octahedral
3+Can be by Mg
2+Displacement, this displacement are so that produced permanent negative electrical charge in the smectite structure, so bentonite has good cation exchange.In addition, the specific area that bentonite is larger by activation modification, can significantly improve it to the adsorption cleaning ability of various pollutants so that it has huge adsorption capacity.When the urea-formaldehyde glue Free-formaldehyde was adsorbed, bentonite must have good dispersiveness, with increase clay particle specific area, thereby gave full play to bentonitic adsorption capacity.When forming suspension with water, the bentonite particle can form colloid, and its micelle structure can be expressed as:
Under the effect of external electric field, it is mobile that clay particle adsorbs firmly counter ion with a part, and this part counter ion consists of adsorption layer; And another part counter ion from solid phase surface away from, attraction is less, then can move to other direction in electric field, these counter ions belong to diffusion layer.Current potential when adsorption layer and diffusion layer relatively move on the sliding surface is called electrokinetic potential or zeta potential.
Natural montmorillonite mostly is greatly the smaller calcium-base bentonite of zeta potential, with calcium-base bentonite and Na
+Carry out can be changed into the Na base bentonite, Na after the ion-exchange
+Little with the absorption affinity of glue nuclear, thus its zeta potential is raise, and repulsive force is large between particle; Again because Na
+Combined water Ca
2+Combined water, so the moisture film of the clay particle of Na-clay parcel is thicker, thereby be conducive to interparticle mutual slip, therefore, bentonite dispersive property in urea-formaldehyde glue is improved after the sodium, the corresponding enhancing of aldehydes removal ability.Bentonite sodium reaction equation is as follows:
The unnecessary negative electrical charge that exists in the bentonite particle structure cell in urea-formaldehyde glue suspension, so that interlayer shows elecrtonegativity, and end face is owing to the scission of link reason shows electropositive.When pH＜7, after disperseing, bentonite can form 3 D stereo card room formula structure in water.This structure can cause the clay sedimentation so that modified alta-mud dispersion effect in urea-formaldehyde glue is poor, thus forfeiture aldehydes removal effect.And as pH in the urea-formaldehyde glue 7 the time, this card room formula structure can be broken, thereby it is dispersed preferably that the bentonite particle is obtained.Ammonium chloride in the modified alta-mud, natrium nitrosum, NH
4HCO
3And after the hydrolysis of the electrolyte such as sodium pyrophosphate, the meeting in the urea-formaldehyde glue exists Cl-, NH
4 +, HCO
3 -And P2O7
4 -Plasma.NH wherein
4 +, Cl
-But the curing performance of Effective Raise urea-formaldehyde glue is the curing agent of urea-formaldehyde glue, and their existence is for the performance important role that keeps urea-formaldehyde glue; NO
2 -, HCO
3 -And P2O7
4 -For all producing OH after their hydrolysis of weak acid radical ion
-, make the pH of urea-formaldehyde glue〉and 7.At this moment, the bentonite particle is better dispersed in the urea-formaldehyde glue, is beneficial to the aldehydes removal operation.As inorganic salts dispersant NO
2 -, HCO
3 -And P2O7
4 -Each tool advantage.And when common the use, can not chemical reaction occur between them and make and lost efficacy each other, for adapting to dissimilar urea-formaldehyde glue products, with its common use, can obtain preferably aldehydes removal effect.
Hydroxyethylcellulose (HEC) is a kind of nonionic soluble fibre element ethers, has good thickening, suspension, dispersion, emulsification, bonding, film forming, protection moisture and the characteristic such as protecting colloid is provided.In urea-formaldehyde glue its water-wet side can with bentonite micelle surface conjunction, form layer protecting film on micelle surface, rely on the sterically hindered effect of its molecule long-chain, each micelle particle repulsion increases, thereby has increased the stability of urea-formaldehyde glue; In addition, in urea-formaldehyde glue, add modified alta-mud and when stirring for 50 ℃, part HEC molecule can insert between the bentonite molecular layer, has increased bentonite molecular layer spacing, so that bentonite PARA FORMALDEHYDE PRILLS(91,95) adsorption capacity improves greatly after the modification.
In sum, the present invention compared with prior art, the PARA FORMALDEHYDE PRILLS(91,95) adsorption efficiency is high, and Formaldehyde emission rate is extremely low.Chemical reaction does not occur in each adding ingredient in the modified alta-mud to each other, can mutually promote, acting in conjunction, and can be applicable to various types of urea-formaldehyde glue products, so that range of application of the present invention is more wide.The present invention has the advantages such as technique is simple, easy to operate, production process is discharged without " three wastes ", production cost is low.
The specific embodiment
The invention will be further described below in conjunction with embodiment, and purpose only is to understand better content of the present invention.Therefore, illustrated embodiment does not limit protection scope of the present invention.
The described modified alta-mud environmental protection of present embodiment aldehyde remover preparation method, carry out in the steps below:
A. raw material sodium: press calcium bentonite: the ratio of weight and number of sodium carbonate=100:3, take by weighing respectively calcium bentonite and sodium carbonate, calcium bentonite is pulverized rear 200 mesh sieves of crossing, then add the sodium carbonate mixing, compound is tiled in dry place, sprays the moisture that accounts for calcium bentonite weight 10% in mix surface, and abundant mixing, sealing 24h carries out natridization reaction, afterwards natural air drying in hermetically sealed can.
B. mechanical agitation: meter by weight, take by weighing 100 parts of raw materials after the sodium, add 1.5 parts hydroxyethylcellulose, 2 parts ammonium chloride, 4 parts natrium nitrosum, 3 parts of sodium pyrophosphates, mechanical agitation 3h in the efficient pulverizing device.
C. shock-absorbing capacity improves: after the cooling of step b gained powder, add 2 parts of NH
4HCO
3, stirring at low speed 30min.
D. sieve: step c products obtained therefrom is crossed 300 mesh sieves be modified alta-mud environmental protection aldehyde remover pulvis.
The described modified alta-mud environmental protection of present embodiment aldehyde remover using method, carry out as follows:
Count by weight, take by weighing 10 parts of modified alta-mud environmental protection aldehyde remover pulvis, add 10 parts of running water, high-speed stirred 40 minutes takes by weighing 10 parts of its suspension again, adds in 90 parts of urea-formaldehyde glues, be heated to 50 ℃, fully stirred 30 minutes, place more than the 24h, formaldehyde can fully be adsorbed in the urea-formaldehyde glue.
Aldehydes removal test testing result:
Aldehyde remover of the present invention is carried out aldehydes removal by using method to urea-formaldehyde glue, carry out the mensuration of free formaldehyde content by GB18583-2008 " limits of harmful substances in the indoor decorating and refurnishing materials adhesive " acetylacetone,2,4-pentanedione AAS, testing result is as shown in table 1 below:
Table 1
| Project name | Limited Doses | Testing result |
| Free formaldehyde (g/kg) | ≤1.0 | 0.77 |
By as seen from Table 1, the present invention has preferably removal effect to the urea-formaldehyde glue Free-formaldehyde.
Claims (4)
1. modified alta-mud environmental protection aldehyde remover preparation method is characterized in that it carries out in the steps below:
A. raw material sodium: press calcium bentonite: the ratio of weight and number of sodium carbonate=100:2-3.5, take by weighing respectively calcium bentonite and sodium carbonate, calcium bentonite is pulverized rear 200 mesh sieves of crossing, then add the sodium carbonate mixing, compound is tiled in dry place, sprays the moisture that accounts for calcium bentonite weight 10% in mix surface, and abundant mixing, sealing 24h carries out natridization reaction, afterwards natural air drying in hermetically sealed can;
B. mechanical agitation: meter by weight, take by weighing 100 parts of raw materials after the sodium, the hydroxyethylcellulose, the ammonium chloride of 1.5-2.5 part and the natrium nitrosum of 2.5-5 part that add 0.5-2.5 part, mechanical agitation 3h obtains powder in the efficient pulverizing device;
C. sieve: step b gained powder is crossed 300 mesh sieves be modified alta-mud environmental protection aldehyde remover pulvis.
2. modified alta-mud environmental protection aldehyde remover preparation method as claimed in claim 1 is characterized in that, among the step b, also adds 2-4 part sodium pyrophosphate.
3. modified alta-mud environmental protection aldehyde remover preparation method as claimed in claim 1 or 2 is characterized in that, after the cooling of step b gained powder, adds 1-3 part NH
4HCO
3, stirring at low speed 30min.
4. modified alta-mud environmental protection aldehyde remover using method as claimed in claim 1 is characterized in that it carries out as follows:
Count by weight, take by weighing 10 parts of modified alta-mud environmental protection aldehyde remover pulvis, add 10 parts of running water, high-speed stirred 40 minutes takes by weighing 10 parts of its suspension again, adds in 90 parts of urea-formaldehyde glues, be heated to 50 ℃, fully stirred 30 minutes, place more than the 24h, formaldehyde can fully be adsorbed in the urea-formaldehyde glue.
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Cited By (7)
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| CN104016709A (en) * | 2014-06-17 | 2014-09-03 | 河海大学 | Preparation method of porous sodium-based bentonite particles |
| CN104028245A (en) * | 2014-05-12 | 2014-09-10 | 谷屿 | Modified nanometer titanium dioxide with relatively good adsorption effect and preparation method thereof |
| CN105038668A (en) * | 2015-09-11 | 2015-11-11 | 江苏振宇环保科技有限公司 | Preparing method of nanometer bentonite modified urea resin adhesive |
| CN105727884A (en) * | 2016-04-11 | 2016-07-06 | 张兴华 | Bentonite clay particles and preparation method thereof |
| CN105833833A (en) * | 2016-04-11 | 2016-08-10 | 张兴华 | Bentonite raw ore particles and preparation method thereof |
| CN106517896A (en) * | 2016-10-27 | 2017-03-22 | 三台县祺又环保科技有限公司 | Coating with air purifying function |
| CN107115550A (en) * | 2016-10-27 | 2017-09-01 | 三台县祺又环保科技有限公司 | Air purifying preparation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028245A (en) * | 2014-05-12 | 2014-09-10 | 谷屿 | Modified nanometer titanium dioxide with relatively good adsorption effect and preparation method thereof |
| CN104028245B (en) * | 2014-05-12 | 2015-12-09 | 张家俊 | A kind of have modified nano-titanium dioxide of better adsorption effect and preparation method thereof |
| CN104016709A (en) * | 2014-06-17 | 2014-09-03 | 河海大学 | Preparation method of porous sodium-based bentonite particles |
| CN104016709B (en) * | 2014-06-17 | 2015-08-26 | 河海大学 | A kind of preparation method of porous Na-bentonite soil particle |
| CN105038668A (en) * | 2015-09-11 | 2015-11-11 | 江苏振宇环保科技有限公司 | Preparing method of nanometer bentonite modified urea resin adhesive |
| CN105727884A (en) * | 2016-04-11 | 2016-07-06 | 张兴华 | Bentonite clay particles and preparation method thereof |
| CN105833833A (en) * | 2016-04-11 | 2016-08-10 | 张兴华 | Bentonite raw ore particles and preparation method thereof |
| CN106517896A (en) * | 2016-10-27 | 2017-03-22 | 三台县祺又环保科技有限公司 | Coating with air purifying function |
| CN107115550A (en) * | 2016-10-27 | 2017-09-01 | 三台县祺又环保科技有限公司 | Air purifying preparation |
| CN106517896B (en) * | 2016-10-27 | 2018-04-20 | 三台县祺又环保科技有限公司 | Coating with air-cleaning function |
| CN107115550B (en) * | 2016-10-27 | 2018-06-12 | 三台县祺又环保科技有限公司 | Air purifying preparation |
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