CN101497674A - Macromole polymerization inhibitor containing phenolic group and azoxynaphthalene and preparation thereof - Google Patents
Macromole polymerization inhibitor containing phenolic group and azoxynaphthalene and preparation thereof Download PDFInfo
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- CN101497674A CN101497674A CNA2009101162657A CN200910116265A CN101497674A CN 101497674 A CN101497674 A CN 101497674A CN A2009101162657 A CNA2009101162657 A CN A2009101162657A CN 200910116265 A CN200910116265 A CN 200910116265A CN 101497674 A CN101497674 A CN 101497674A
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Abstract
The invention discloses a macromolecular polymerization inhibitor containing phenolic groups and nitroxide groups, and a preparation method thereof. The polymethyl acrylate with polymerization degree of p, the phenolic compound and the nitroxide free radical type compound are dissolved in the solvent according to the mol ratio of 1:x:y, the catalyst with mass being 0.5-3.0wt percent of the total mass of the reaction mixture is added in to react at the temperature of 20-80 DEG C and under the 0.05-0.09MPa until the concentration of the phenolic compound and the nitroxide free radical type compound is not changed, the reaction mixture subsides in water, and the polyacrylate main chain is obtained after the sediment is dried and is connected with the macromolecular polymerization inhibitor containing the phenolic groups and the nitroxide free radical groups through ester linkage; and the method has the advantages that the raw material is easily obtained, the operation is simple and the method is convenient for the industrial production. The prepared product can effectively prevent the acrylate from being polymerized in the production process, reduce the content of the low polymer in the product, reduce the consumption of the total polymerization inhibitor and improve the product quality and has the broad industrial application prospect.
Description
Technical field
The invention belongs to the stopper technical field in the polyreaction, be specifically related to be used for esters of acrylic acid, methacrylic ester (following general designation acrylate) production process prevents that polymeric from comprising macromole polymerization inhibitor of phenolic group and nitrogen oxygen base and preparation method thereof.
Background technology
In the acrylate production process, because the carbon carbon unsaturated double-bond in vinylformic acid and the ester class formation thereof, the gelation of polymerization reaction take place, even generation easily, implode lead to industrial accident.Wherein, how therefore esters of acrylic acid prevent in process of production that than the easier generation polymerization of vinylformic acid the polymerization of vinylformic acid and ester class thereof is very crucial.
Adding stopper is the polymeric effective means that prevents vinylformic acid and ester class thereof.Up to now, though it is of a great variety from the single variety to the compound system to be used for the stopper of acrylate, mainly be phenols, free radical type, amine stopper, and the composite polymerzation inhibitor of forming by free radical type stopper and phenol or amine stopper.Wherein phenols, amine stopper need work in the presence of oxygen molecule, and the solvability of metal-salt in system is relatively poor, and the poly-efficient of resistance is low in the high temperature production process, makes its industrial application be subjected to certain restriction; The living free radical polymerization compounds is another kind of stopper, and they are remarkable to the polymerization inhibition effect of esters of acrylic acid, and efficient is high and need not lead to oxygen.Existing to 2,2,6, studies show that of 6-tetramethyl--4-hydroxy-piperdine nitroxyl free radical (TMHPO) exists synergistic effect between the stopper of they and some other kind and its polymerization inhibition effect significantly promoted.When TMHPO and phenolic inhibitor are composite, its consumption is reduced, the poly-time lengthening of resistance, and require very little to oxygen level.
In traditional acrylate production technique, esterification process is a homogeneous reaction, and vinylformic acid and ester class thereof are evenly distributed in the reactor, and the favorable solubility of small molecules stopper, can be dispersed in the reaction system preferably, thereby reach the polymerization that prevents vinylformic acid and ester class thereof.But, what adopt in the new production process of acrylate is the mobile mode of production of continuity, effective catalyst loads on the fixation reaction bed, the reaction product acrylate has a concentration distribution in system, regional concentration near catalyzer is higher, because the high polymerization activity of acrylate, polymerization takes place in this zone extremely easily.Therefore, the inhibitor concentration of these catalyst area requires also higher.If adopt traditional small molecules stopper to suppress polyreaction in the total system, just must improve the inhibitor concentration demand that its consumption could satisfy catalyst area greatly, cause waste, and side reaction takes place easily, the stopper residual quantity is big, color burn, and quality product descends.Novel process requires the stopper macromoleization and can be fixed on the reaction bed, at the stopper of catalyst area distribution higher concentration, reaching the efficient inhibition to newly-generated acrylate, thereby reduces the usage quantity of whole system stopper.
About the small molecules stopper, U.S. Pat 3,666,794 to have proposed Resorcinol-phenol-oxygen system is used for the resistance of acrylic ester monomer poly-, but must blast oxygen in addition, otherwise polymerization inhibition effect is relatively poor, and the poly-time of resistance is short, uses difficulty.Chinese patent CN 86 1 03840 propose with phenol amine and the composite stopper of nitroxyl free radical, between two components synergistic effect is arranged, the effect of composite polymerzation inhibitor significantly improves with the concentration stock blend, and very little to the requirement of the oxygen level in the system.But this stopper only is applicable in traditional acrylate production method, and is powerless for the high local concentrations stopper that requires in the new production process.Have not yet to see the report of relevant macromole polymerization inhibitor and preparation method thereof.
Summary of the invention
The purpose of this invention is to provide a kind of macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base and preparation method thereof,, reach the good polymerization inhibition effect of acrylate production process to overcome the above-mentioned defective of prior art.
The macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base of the present invention is characterised in that its polyacrylate backbone connects phenolic group and nitrogen-oxygen free radical group by ester bond, and structural formula can be expressed as:
Wherein, R is a phenolic group, and R ' is a nitrogen-oxygen free radical group, R
1Be hydrogen or methyl, m, n, q are respectively side chain and have R, R ', R
1The polymerization degree of the acrylate of group, m, n, q are positive integer, and 5≤n+m+q≤1000.
Described phenolic group has following structure:
Wherein, R
2Base is hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
Described nitrogen-oxygen free radical group has following structure:
Wherein, R
3, R
4Be respectively independently hydrogen, hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
The preparation method who comprises the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base of the present invention, it is characterized in that: be the polymethyl acrylate of p by the polymerization degree: phenolic compound: the mol ratio of nitroxyl free radical compounds is that 1:x:y is dissolved in the solvent, add the catalyzer of pressing reaction mixture total mass 0.5-3.0wt%, at temperature 20-80 ℃, under the 0.05-0.09MPa vacuum degree condition, react to phenolic compound and nitroxyl free radical compounds concentration and no longer change (can adopt gas-chromatography follow the tracks of), with reaction mixture sedimentation in water, and macromole polymerization inhibitor will be obtained promptly after the sediment drying, 0.1p≤x≤0.5p wherein, 0.1p≤y≤0.5p, 0.1p≤x+y≤0.5p, described polymerization degree p are the integer of 5-1000.
Described solvent is N, N-dimethyl-methane amide, N, N-dimethyl-ethanamide and/or methyl-sulphoxide.
Described catalyzer is sodium hydroxide, potassium hydroxide, sodium methylate, sodium ethylate, yellow soda ash, salt of wormwood or hydrogenchloride.
Described phenolic compound is following structure:
Wherein, R
2Base is hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
Described nitroxyl free radical compounds is following structure:
Wherein, R
3, R
4Be respectively independently hydrogen, hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
With U.S. Pat 3,666, Resorcinol-phenol of 794-oxygen system is compared, because macromole polymerization inhibitor of the present invention is incorporated into phenolic inhibitor and living free radical polymerization in the system simultaneously, can reduce the demand of system effectively to oxygen level, and both have synergistic effect, have improved the poly-efficient of resistance.Compare with the nitroxyl free radical compound polymerization inhibitor with the phenol amine that Chinese patent CN 86 1 03840 proposes, though the latter's composite polymerzation inhibitor is owing to its effect of synergistic effect significantly improves with the concentration stock blend, very little to the requirement of the oxygen level in the system, but this composite polymerzation inhibitor can't satisfy the requirement of the catalyst area high local concentrations stopper of new production process; Macromole polymerization inhibitor of the present invention not only has synergistic effect equally, oxygen level requires low, and can be fixed on well near the supported catalyst zone of new production process, improve this regional inhibitor concentration greatly, stop the polymerization of product acrylate effectively, and reduced the usage quantity of whole system stopper, helped the raising of quality product.
The present invention adopts ester exchange method that phenols and nitroxyl free radical class stopper are attached in the same macromole, and raw material cheaply is easy to get, and the reaction conditions gentleness is easy and simple to handle, helps large-scale industrial production.Macromole polymerization inhibitor provided by the invention comprises phenols and the poly-group of nitroxyl free radical resistance simultaneously, can effectively stop the polymerization in the product acrylate generative process, reduce oligomer in the product, reduce total stopper consumption, improve the quality of products, the wide industrial application prospect is arranged.
Embodiment
Describe preparation method and the application in the acrylate industrial production thereof that the present invention comprises the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base in detail with embodiment below.
Embodiment 1
In the three-necked bottle reactor of whipping appts is housed, add polymethylmethacrylate 200g, the p-Hydroxybenzylalcohol 62g, 2,2,6 of molecular weight 2000,6-tetramethyl--4-hydroxy-piperdine nitroxyl free radical 17.3g, catalyst n a
2CO
35.6g (2wt%) with solvent N, N-dimethyl-methane amide 800mL, stirring and dissolving, be warming up to 40 ℃, maintenance vacuum tightness is 0.09MPa, and reaction is extremely through gas chromatographic detection p-Hydroxybenzylalcohol and 2,2,6, the concentration of 6-tetramethyl--4-hydroxy-piperdine nitroxyl free radical no longer changes, after the question response mixture cooling, pour sedimentation in the water of 2L into, filter and collect product, vacuum-drying, obtain white solid product, called after MMIn 1, its productive rate are 88%.
In the infrared spectrum of products therefrom, 1167,1245cm
-1The place is the stretching vibration absorption peak of N-O coordinate bond, 2882cm
-1The place is the stretching vibration absorption peak of C-N key, 1980-2400cm
-1The place is the stretching vibration absorption peak of phenyl ring;
In the nuclear magnetic spectrogram of products therefrom, 7.5-6.8ppm place multiplet ownership is hydrogen atom on the phenyl ring, 4.2-4.0ppm place ownership is-and hydrogen atom among the O-CH-, the 2.0-1.0ppm place is the hydrogen atom of polymethacrylate backbone and pending methyl group.
By last analysis as can be known, products therefrom MMIn 1 is the macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base.
Embodiment 2
In the three-necked bottle reactor of whipping appts is housed, the polymethylmethacrylate 200g that adds molecular weight 8000, p-Hydroxybenzylalcohol 62g, 2,2,6,6-tetramethyl--4-hydroxy-piperdine nitroxyl free radical 86.5g, catalyst n aOH 5.2g (1.5wt%) and solvent N, N-dimethyl-ethanamide 1000mL, stirring and dissolving is warming up to 50 ℃, maintenance vacuum tightness is 0.08MPa, reaction is extremely through gas chromatographic detection p-Hydroxybenzylalcohol and 2,2,6, the concentration of 6-tetramethyl--4-hydroxy-piperdine nitroxyl free radical no longer changes, after the question response mixture cooling, pour sedimentation in the water of 2L into, filter and collect product, vacuum-drying, obtain white solid product, called after MMIn2, its productive rate are 85%.
In the infrared spectrum of products therefrom, 1167,1245cm
-1The place is the stretching vibration absorption peak of N-O coordinate bond, 2882cm
-1The place is the stretching vibration absorption peak of C-N key, 1980-2400cm
-1The place is the stretching vibration absorption peak of phenyl ring;
In the nuclear magnetic spectrogram of products therefrom, 7.5-6.8ppm place multiplet ownership is hydrogen atom on the phenyl ring, 4.2-4.0ppm place ownership is-and hydrogen atom among the O-CH-, the 2.0-1.0ppm place is the hydrogen atom of polymethacrylate backbone and pending methyl group.
By last analysis as can be known, products therefrom MMIn2 is the macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base.
Embodiment 3
In existing Viscoat 295 (TMPTA) production process, with SO
4 2-/ TiO
2/ La
3+Be that solid super acid catalyst is fixed in the fixed-bed reactor, under 100 ± 10 ℃ of conditions, earlier TriMethylolPropane(TMP) and vinylformic acid direct esterification obtained TMPTA (original product).Be fixed on catalyzer the same area after the macromole polymerization inhibitor MMIn1 load that comprises phenolic group and nitrogen oxygen base with preparation among the invention described above embodiment 1 again, keep other condition of former technology constant, carry out the continuous production of TMPTA, products therefrom is a TMPTA product 1; The consumption that reduces the small molecules stopper is 1/2 in the former technology, keeps other working condition constant, and products therefrom is a TMPTA product 2.Their part physical properties and original product relatively be listed in the table below 1.
Table 1
| Performance | TMPTA product 1 | TMPTA product 2 | Original product |
| Outward appearance | Clear | Clear | Clear |
| Ester content (%) | 98.8 | 98.7 | 98.0 |
| Color APHA | 26 | 23 | 28 |
| Viscosity (cps, 25 ℃) | 68 | 70 | 90 |
| Moisture content (%) | 0.1 | 0.1 | 0.1 |
| Acid number (mgKOH/g) | 0.4 | 0.4 | 0.4 |
| Stopper (ppm) | 400 | 250 | 400 |
By the data in the table 1 as can be known, compare with original product, TMPTA product 1 and TMPTA product 2 have improved fat content significantly, have reduced the viscosity and the color of product, and the latter has also reduced the residual quantity of stopper.
Embodiment 4
To be fixed on catalyzer the same area after above-mentioned macromole polymerization inhibitor MMIn 2 loads that comprise phenolic group and nitrogen oxygen base, keep other condition of former technology constant, the consumption that reduces the small molecules stopper is 1/2 in the former technology, carries out the continuous production of TMPTA, and products therefrom is a TMPTA product 3; The consumption that reduces the small molecules stopper is 1/4 in the former technology, keeps other working condition constant, and products therefrom is a TMPTA product 4.Their part physical properties and original product relatively be listed in the table below 2.
Table 2
| TMPTA product 3 | TMPTA product 4 | |
| Outward appearance | Clear | Clear |
| Ester content (%) | 99.2 | 99.0 |
| Color APHA | 26 | 22 |
| Viscosity (cps, 25 ℃) | 65 | 66 |
| Moisture content (%) | 0.1 | 0.1 |
| Acid number (mgKOH/g) | 0.4 | 0.4 |
| Stopper (ppm) | 200 | 100 |
By the data in the table 2 as can be known, compare with original product, TMPTA product 3 and TMPTA product 4 have improved fat content significantly, have reduced the viscosity and the color of product, have reduced the residual quantity of stopper in the product simultaneously.
Claims (8)
1, a kind of macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base is characterised in that its polyacrylate backbone connects phenolic group and nitrogen-oxygen free radical group by ester bond, and structural formula is:
Wherein, R is a phenolic group, and R ' is a nitrogen-oxygen free radical group, R
1Be hydrogen or methyl, m, n, q are respectively side chain and have R, R ', R
1The polymerization degree of the acrylate of group, m, n, q are positive integer, and 5≤n+m+q≤1000.
2, the macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base according to claim 1 is characterised in that described phenolic group has following structure:
Wherein, R
2Base is hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
3, the macromole polymerization inhibitor that comprises phenolic group and nitrogen oxygen base according to claim 1 is characterised in that described nitrogen-oxygen free radical group has following structure:
Wherein, R
3, R
4Be respectively independently hydrogen, hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
4, the described preparation method who comprises the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base of claim 1, it is characterized in that: be the polymethyl acrylate of p by the polymerization degree: phenolic compound: the mol ratio of nitroxyl free radical compounds is that 1:x:y is dissolved in the solvent, add the catalyzer of pressing reaction mixture total mass 0.5-3.0wt%, under 20-80 ℃ and 0.05-0.09MPa vacuum degree condition, react to phenolic compound and nitroxyl free radical compounds concentration and no longer change, with reaction mixture sedimentation in water, and with after the sediment drying, promptly obtain macromole polymerization inhibitor, 0.1p≤x≤0.5p wherein, 0.1p≤y≤0.5p, 0.1p≤x+y≤0.5p, described polymerization degree p are the integer of 5-1000.
5, as comprising the preparation method of the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base as described in the claim 4, be characterised in that described solvent is N, N-dimethyl-methane amide, N, N-dimethyl-ethanamide and/or methyl-sulphoxide.
6, as comprising the preparation method of the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base as described in the claim 4, be characterised in that described catalyzer is sodium hydroxide, potassium hydroxide, sodium methylate, sodium ethylate, yellow soda ash, salt of wormwood or hydrogenchloride.
7, as comprising the preparation method of the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base as described in the claim 4, be characterised in that described phenolic compound is following structure:
Wherein, R
2Base is hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
8, as comprising the preparation method of the macromole polymerization inhibitor of phenolic group and nitrogen oxygen base as described in the claim 4, be characterised in that described nitroxyl free radical compounds is following structure:
Wherein, R
3, R
4Be respectively independently hydrogen, hydroxyl, alkyl, alkoxyl group, halogen, haloalkyl, acyl group, acyloxy or amide group.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104211863A (en) * | 2014-08-27 | 2014-12-17 | 河北科技大学 | Preparation method and application of free nitroxide radical polymer brush polymerization inhibitor |
| CN110903422A (en) * | 2019-12-09 | 2020-03-24 | 万华化学集团股份有限公司 | Polymerization inhibitor and preparation method and application thereof |
| CN114106226A (en) * | 2021-12-21 | 2022-03-01 | 湖州久益有机玻璃有限公司 | Production method of flame-retardant organic glass plate |
-
2009
- 2009-03-03 CN CN2009101162657A patent/CN101497674B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104211863A (en) * | 2014-08-27 | 2014-12-17 | 河北科技大学 | Preparation method and application of free nitroxide radical polymer brush polymerization inhibitor |
| CN104211863B (en) * | 2014-08-27 | 2016-06-29 | 河北科技大学 | The preparation method of a kind of NO free radical polymer brush polymerization inhibitor and application thereof |
| CN110903422A (en) * | 2019-12-09 | 2020-03-24 | 万华化学集团股份有限公司 | Polymerization inhibitor and preparation method and application thereof |
| CN114106226A (en) * | 2021-12-21 | 2022-03-01 | 湖州久益有机玻璃有限公司 | Production method of flame-retardant organic glass plate |
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