CN114539614B - Alkyd resin depolymerizing agent and preparation method and use method thereof - Google Patents
Alkyd resin depolymerizing agent and preparation method and use method thereof Download PDFInfo
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- CN114539614B CN114539614B CN202210096807.4A CN202210096807A CN114539614B CN 114539614 B CN114539614 B CN 114539614B CN 202210096807 A CN202210096807 A CN 202210096807A CN 114539614 B CN114539614 B CN 114539614B
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- 229920000180 alkyd Polymers 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000011347 resin Substances 0.000 claims abstract description 27
- 239000002904 solvent Substances 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000009835 boiling Methods 0.000 claims abstract description 15
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 4
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 12
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 12
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 12
- 239000002518 antifoaming agent Substances 0.000 claims description 10
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 5
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 claims description 5
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 5
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 5
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000005642 Oleic acid Substances 0.000 claims description 5
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 5
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 5
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005809 transesterification reaction Methods 0.000 claims description 5
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 239000013530 defoamer Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000008719 thickening Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 229920005862 polyol Polymers 0.000 description 4
- 150000003077 polyols Chemical class 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 150000002148 esters Chemical group 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 150000007519 polyprotic acids Polymers 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000007524 organic acids Chemical group 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
- C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
- C08J11/26—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing carboxylic acid groups, their anhydrides or esters
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/03—Preparation of carboxylic acid esters by reacting an ester group with a hydroxy group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/08—Polyesters modified with higher fatty oils or their acids, or with resins or resin acids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polyesters Or Polycarbonates (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention belongs to the technical field of resin depolymerization agents, and particularly relates to an alkyd resin depolymerization agent, a preparation method and a use method thereof. The depolymerizing agent is prepared from the following raw materials in parts by weight: 70-85 parts of organic unit acid, 15-30 parts of high boiling point solvent and 1-3 parts of defoamer. The invention also discloses a preparation method and a use method of the depolymerizing agent. Compared with the prior art, the invention has the following beneficial effects: the invention has the advantages of small dosage of needed emergency materials, quick reaction and convenient feeding, can prevent alkyd resin from further reaction and thickening in time during excessive polymerization, avoid resin from gelling in a reaction kettle, and has good depolymerization effect on the gelled alkyd resin; the depolymerization agent is liquid, is convenient to operate during production, has no influence on production safety, and after the depolymerization agent is added, the over-viscous resins can be reused, so that the generation of dangerous waste products is reduced.
Description
Technical Field
The invention belongs to the technical field of resin depolymerization agents, and particularly relates to an alkyd resin depolymerization agent, a preparation method and a use method thereof.
Background
Alkyd resin is usually polymerized by polyalcohol, polybasic acid, grease, monoacid and the like, and in the polymerization esterification, excessive polymerization or gelation phenomenon can occur if improper control or wrong feeding is performed on the resin, the alkyd resin is excessively polymerized or gelled, the quality is reduced due to light people, products are scrapped, the resin is gelled in a reaction kettle due to heavy people, discharging is impossible, equipment is scrapped, and even safety accidents occur.
There are other reported methods for processing polyester resins by depolymerizing the gelled or to-be-gelled resin with a polyol in an amount several times the equivalent amount of acid and phthalic anhydride in the resin, and the amount of degradation materials (polyol) used in the method is large, so that the processing conditions required by the method cannot be satisfied for most reaction kettles with little residual space. In addition, if the degradation material in the method is solid, a large amount of high-temperature solvent vapor can be emitted when the kettle cover is opened due to the existence of the reflux solvent in the reaction kettle at the critical point that the resin is to be gelled, and the degradation material is inconvenient to timely feed into the reaction kettle for rescuing.
Other reports exist that a small amount of polyol is used for degrading alkyd resin to be gelled, but the degradation speed of the method is slow, the effect is poor, if the alkyd resin is gelled due to excessive polybasic acid, the alkyd resin in a kettle is gelled more quickly when a small amount of polyol is added, and the depolymerization is more unfavorable.
Disclosure of Invention
First, the technical problem to be solved
In order to overcome the defects of the resin depolymerizing agent in the prior art, the invention provides an alkyd resin depolymerizing agent with good depolymerization effect, and a preparation method and a using method thereof.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides an alkyd resin depolymerizing agent which is prepared from the following raw materials in parts by weight:
70 to 85 portions of organic unit acid
High boiling point solvent 15-30
1-3 parts of defoaming agent.
Further, the organic unit acid is one or more of rosin, oleic acid and synthetic fatty acid.
Further, the high boiling point solvent is selected from one or more of heavy aromatic hydrocarbon and propylene glycol butyl ether.
Further, the defoamer is methyl silicone oil which can bear higher temperature.
The invention also provides a preparation method of the depolymerizing agent, which comprises the following steps: sequentially adding a high boiling point solvent, organic unit acid and a defoaming agent into a reaction kettle, heating to 80-100 ℃, starting stirring, preserving heat at 80-100 ℃ until the materials are in a homogeneous system, cooling to below 50 ℃, and inspecting, and forming the depolymerizing agent after passing the inspection.
Furthermore, when the organic acid unit is rosin, the rosin is smashed in advance and then added into the reaction kettle.
Still another object of the present invention is to provide a method for using the depolymerizing agent, wherein the method comprises: pumping the depolymerization agent which is dissolved and qualified into an overhead tank for standby; if the viscosity of the alkyd resin reaction kettle is abnormally increased and obviously exceeds the control index, the temperature can be properly reduced, and a depolymerizing agent is added into the alkyd resin according to the weight of the alkyd resin of about 1/20-1/10, and the alkyd resin is continuously stirred to fully perform transesterification reaction, so that the viscosity of the alkyd resin reaction kettle is reduced until the alkyd resin is finally depolymerized, and the depolymerized material is reused by small-scale polymerization.
Further, the depolymerization agent is present in an amount of about 1/20 to 1/10 by weight of the alkyd resin, depending on the formulation oil and the reaction viscosity of the resin.
Further, if the resin is relatively serious in gelation and is difficult to depolymerize, the depolymerization agent should be added, and the gelled material should be subjected to subsequent treatment according to the specific conditions; the concrete conditions are feeding errors and abnormal reaction temperature.
(III) beneficial effects
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has the advantages of small dosage of needed emergency materials, quick reaction and convenient feeding, can prevent alkyd resin from further reaction and thickening in time during excessive polymerization, avoid resin from gelling in a reaction kettle, and has good depolymerization effect on the gelled alkyd resin; the depolymerization agent is liquid, is convenient to operate during production, has no influence on production safety, and after the depolymerization agent is added, the over-viscous resins can be reused, so that the generation of dangerous waste products is reduced.
2. The invention utilizes the high boiling point solvent (avoiding bumping) to dissolve the organic unit acid, reduces the viscosity of the resin, is favorable for the organic unit acid to fully permeate into the resin, and rapidly performs ester exchange reaction with the resin by the characteristic of low functionality of the organic unit acid, so as to reduce the average functionality of the resin reaction system and delay or prevent further polymerization; the defoaming agent is added, so that a large number of bubbles generated due to overlarge viscosity of the resin can be greatly reduced, and the risk of overflow of the reaction kettle is reduced.
Detailed Description
The technical scheme is as follows:
the present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The preparation method of the alkyd resin depolymerization agent comprises the following components in parts by weight:
80 parts by weight of organic monoacid (wherein, oleic acid is 40 parts by weight, rosin is 40 parts by weight), 18 parts by weight of high boiling point solvent (wherein, propylene glycol butyl ether is 9 parts by weight, heavy aromatic hydrocarbon is 9 parts by weight), 2 parts by weight of defoamer (wherein, methyl silicone oil is 2 parts by weight).
A method for preparing an alkyd resin depolymerizing agent, comprising the following steps:
sequentially adding a high boiling point solvent, organic monoacid (if the organic monoacid is rosin, the organic monoacid needs to be broken in advance) and a defoaming agent into a reaction kettle, heating to 80-100 ℃, starting stirring, preserving heat at 80-100 ℃ until the materials are in a homogeneous system, cooling to below 50 ℃, and passing inspection for later use.
The depolymerizing agent is added into long-oil alkyd resin gel, the temperature is controlled to be about 200 ℃, the mixture is continuously stirred to fully carry out transesterification reaction, the viscosity is reduced to be less than 150 seconds after 4.5 hours (coating-4 cups, 25 ℃, alkyd resin: no. 200 solvent=1:1), and the depolymerization is successful.
Example 2
The preparation method of the alkyd resin depolymerization agent comprises the following components in parts by weight:
82 parts by weight of organic monoacid (wherein, 37 parts by weight of oleic acid, 45 parts by weight of rosin), 17 parts by weight of high boiling point solvent (wherein, 7 parts by weight of propylene glycol butyl ether, 10 parts by weight of heavy aromatic hydrocarbon), 1 part by weight of defoamer (wherein, 1 part by weight of methyl silicone oil).
A method for preparing an alkyd resin depolymerizing agent, comprising the following steps:
sequentially adding a high boiling point solvent, organic monoacid (if the organic monoacid is rosin, the organic monoacid needs to be broken in advance) and a defoaming agent into a reaction kettle, heating to 80-100 ℃, starting stirring, preserving heat at 80-100 ℃ until the materials are in a homogeneous system, cooling to below 50 ℃, and passing inspection for later use.
The depolymerizing agent is added into alkyd resin gel with medium and long oil, the temperature is controlled to be about 200 ℃, and the mixture is continuously stirred to fully carry out transesterification reaction, the viscosity is reduced to be less than 150 seconds after 4 hours (coating-4 cups, 25 ℃, alkyd resin: no. 200 solvent=1:1), and the depolymerization is successful.
Example 3
The preparation method of the alkyd resin depolymerization agent comprises the following components in parts by weight:
73 parts by weight of organic monoacid (15 parts by weight of synthetic fatty acid, 20 parts by weight of oleic acid and 38 parts by weight of rosin), 25 parts by weight of high boiling point solvent (5 parts by weight of propylene glycol butyl ether and 20 parts by weight of heavy aromatic hydrocarbon), and 2 parts by weight of defoamer (2 parts by weight of methyl silicone oil).
A method for preparing an alkyd resin depolymerizing agent, comprising the following steps:
sequentially adding a high boiling point solvent, organic monoacid (if the organic monoacid is rosin, the organic monoacid needs to be broken in advance) and a defoaming agent into a reaction kettle, heating to 80-100 ℃, starting stirring, preserving heat at 80-100 ℃ until the materials are in a homogeneous system, cooling to below 50 ℃, and passing inspection for later use.
The depolymerizing agent is added into alkyd resin gel with short oil degree, the temperature is controlled to be about 200 ℃, and the alkyd resin gel is continuously stirred to fully carry out transesterification reaction, the viscosity is reduced to be less than 150 seconds after 5.5 hours (coating-4 cups, 25 ℃, and alkyd resin: xylene=1:1), so that depolymerization is successful.
The alkyd resin depolymerization agents prepared in examples 1 to 3 were tested and the results are shown in table 1.
TABLE 1
| Project | Unit (B) | Performance index | Example 1 | Example 2 | Example 3 |
| State in a container | 48h | Liquid state, no precipitation | Compliance with | Compliance with | Compliance with |
| Outflow time (coating-4 cup) | s | ≤30 | 18 | 17 | 15 |
| Acid value | mgKOH/g | ≥130 | 146.1 | 148.2 | 144.8 |
| Depolymerization time (200 ℃ C.) | h | ≤6 | 4.5 | 4 | 5.5 |
The detection result shows that the alkyd resin depolymerizing agent has depolymerization effect on gelled alkyd resin, is safe to use, convenient to operate, low in cost, simple and practical, is a good anti-gelling emergency material in the alkyd resin production process, has main components similar to common raw materials of alkyd resin, and can be recycled, so that dangerous waste products are reduced.
The invention has the following beneficial effects;
1. the invention has the advantages of small dosage of needed emergency materials, quick reaction and convenient feeding, can prevent alkyd resin from further reaction and thickening in time during excessive polymerization, avoid resin from gelling in a reaction kettle, and has good depolymerization effect on the gelled alkyd resin; the depolymerization agent is liquid, is convenient to operate during production, has no influence on production safety, and after the depolymerization agent is added, the over-viscous resins can be reused, so that the generation of dangerous waste products is reduced.
2. The invention utilizes the high boiling point solvent (avoiding bumping) to dissolve the organic unit acid, reduces the viscosity of the resin, is favorable for the organic unit acid to fully permeate into the resin, and rapidly performs ester exchange reaction with the resin by the characteristic of low functionality of the organic unit acid, so as to reduce the average functionality of the resin reaction system and delay or prevent further polymerization; the defoaming agent is added, so that a large number of bubbles generated due to overlarge viscosity of the resin can be greatly reduced, and the risk of overflow of the reaction kettle is reduced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An alkyd resin depolymerizing agent, characterized by: the depolymerizing agent is prepared from the following raw materials in parts by weight:
organic unit acid 70-85
High boiling point solvent 15-30
1-3 parts of defoaming agent;
the organic unit acid is one or more of rosin, oleic acid and synthetic fatty acid;
the high boiling point solvent is one or more selected from heavy aromatic hydrocarbon and propylene glycol butyl ether;
the defoaming agent is methyl silicone oil.
2. The method for preparing the alkyd resin depolymerizing agent according to claim 1, wherein: the preparation method comprises the following steps: sequentially adding a high-boiling point solvent, organic unit acid and a defoaming agent into a reaction kettle, heating to 80-100 ℃, starting stirring, preserving heat at 80-100 ℃ until the materials are in a homogeneous system, cooling to below 50 ℃, and inspecting, and forming the depolymerizing agent after passing the inspection.
3. The method for preparing the alkyd resin depolymerizing agent according to claim 2, wherein: when the organic unit acid is rosin, the rosin is smashed in advance and then added into a reaction kettle.
4. A method for using an alkyd resin depolymerizing agent, which is characterized by comprising the following steps: the using method comprises the following steps: pumping the depolymerization agent of claim 1 or the depolymerization agent prepared by the preparation method of any one of claims 2-3 which is dissolved and qualified into an overhead tank for standby; if the viscosity of the alkyd resin reaction kettle is abnormally increased and obviously exceeds the control index, the temperature can be properly reduced, and a depolymerizing agent is added into the alkyd resin according to the weight of the alkyd resin of about 1/20-1/10, and the alkyd resin is continuously stirred to fully perform transesterification reaction, so that the viscosity of the alkyd resin reaction kettle is reduced until the alkyd resin is finally depolymerized, and the depolymerized material is reused by small-scale polymerization.
5. The method of using an alkyd resin depolymerizing agent of claim 4, wherein: if the resin is seriously gelled and is difficult to depolymerize, the depolymerization agent is added, and the gelled material is subjected to subsequent treatment according to specific conditions; the concrete conditions are feeding errors and abnormal reaction temperature.
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-
2022
- 2022-01-26 CN CN202210096807.4A patent/CN114539614B/en active Active
Patent Citations (9)
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