CN107936206A - The technique of the dedicated melamino-formaldehyde prepolymer of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating - Google Patents
The technique of the dedicated melamino-formaldehyde prepolymer of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating Download PDFInfo
- Publication number
- CN107936206A CN107936206A CN201711400603.0A CN201711400603A CN107936206A CN 107936206 A CN107936206 A CN 107936206A CN 201711400603 A CN201711400603 A CN 201711400603A CN 107936206 A CN107936206 A CN 107936206A
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- China
- Prior art keywords
- powder coating
- low
- temperature setting
- thermosetting powder
- curing accelerator
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with substituted triazines
- C08G12/32—Melamines
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Phenolic Resins Or Amino Resins (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
It is in molar ratio 1 the present invention provides the technique of the dedicated melamino-formaldehyde prepolymer of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating:3~0.5:4 ratio weighs melamine and formalin, it is stirred in three-necked flask, appropriate NaOH solution (1wt%) regulation system pH value is added as 8~9, melamino-formaldehyde mixed solution is heated and stirred in 65~70 DEG C of water-baths, until system bleach, the distilled water of the quality such as addition and formalin, the reaction was continued, and 50min is the watersoluble melamine formaldehyde pre-polymer that can obtain transparent low molecular weight.The rational technology of the present invention, makes simple, it is ensured that the solidification effect of thermosetting powder coating, particularly makes low temperature cured powder coating i.e. easy to produce and process and being capable of long-term safety storage.It is easy to use, it is widely used, has filled up domestic technique blank, allows the use scope of thermosetting powder coating to greatly increase.
Description
Technical field
The present invention relates to powder thermosetting technical field, and in particular to for the super of low-temperature setting thermosetting powder coating
The technique of the trickle dedicated carbamide prepolymer of capsule curing accelerator.
Background technology
Powdery paints is the form entirely different with general coating, it is with existing for the state of attritive powder.Due to not
Using solvent, so referred to as powdery paints.The main feature of powdery paints has：With harmless, high efficiency, save resource and environmental protection
Feature.
It has two major classes：Thermoplastic powder coating and thermosetting powder coating.
Thermosetting powder coating is made of thermosetting resin, curing agent, pigment, filler and auxiliary agent etc..Powder thermosetting
Coating includes：Epoxy resin, Polyester, acrylic resin.
The main film forming matter of thermosetting powder coating --- film-forming resin must when carrying out cross-linking and curing reaction with curing agent
Added with curing catalysts film must be enable to complete solidification process under regulation condition of cure, the usage of trade is referred to as " to cure and promote
Into agent " or " accelerating agent ".Curing accelerator has had been added to polyester resin in the later stage that polyester resin synthesizes under normal circumstances
In, but this dosage allows for the normal condition of cure of powdery paints (such as 180 DEG C, 15 minutes) and powder coating product is made
Effective Storage period (such as：Lower 1 year of room temperature).If want to make powdery paints low-temperature fast-curing, it is necessary to select lower catalytic temperature
Curing accelerator or the dosage for increasing accelerating agent, once the cross-linking reaction temperature of resin and curing agent is near or below powdery paints
Material in the extrusion temperature of extruder, easily formed material in barrel precuring or make extrusion processing can not carry out.
If using blending low-temperature setting accelerating agent after powdery paints, it will cause the powdery paints poor storage stability of low-temperature setting
Problem, use site blending are then not easy to be mixed even, cause film coated surface out-of-flatness.This problems demand solves.
Wherein, the rear end curing agent product accelerating agent in capsule-type curing accelerator extremely closes in whole production process
Key, the rear end curing agent product accelerating agent in a kind of good curing accelerator can allow properties of product to be lifted at double, production process
Also can simplify therewith, therefore, the rear end curing agent product accelerating agent invented in a kind of good curing accelerator is extremely urgent.
The content of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of rational in infrastructure, use easy to use
In the work of the dedicated carbamide prepolymer of the ultrafine microencapsulated curing accelerator of low-temperature setting thermosetting powder coating
Skill, it solves the problems, such as above-mentioned these.
The technical solution adopted in the present invention is as follows：Ultrafine microencapsulated curing for low-temperature setting thermosetting powder coating
The technique of the dedicated carbamide prepolymer of accelerating agent, is in molar ratio 1:3~0.5:4 ratio weighs melamine
And formalin, it is stirred in three-necked flask, it is 8~9 to add appropriate NaOH solution (1wt%) regulation system pH value, will
Melamino-formaldehyde mixed solution is heated and stirred in 65~70 DEG C of water-baths, until system bleach, addition and formalin
Etc. the distilled water of quality, the reaction was continued, and 50min is the watersoluble melamine-formaldehyde pre-polymer that can obtain transparent low molecular weight.
Preferably, the concentration of the formalin is 37%.
Preferably, the watersoluble melamine-formaldehyde pre-polymer when in use, can be in external sheath ultrathin nanometer capsule
Protective layer, avoids participating in reacting in the powdery paints process segment, can be in powdery paints in use, the low-temperature setting for participating in the later stage is anti-
Should, to ensure the effect of low-temperature setting.
Preferably, the ultrathin nanometer capsule protective layer is Nanocrystal of the fusing point more than 65 degrees Celsius.
Beneficial effects of the present invention include：
The rational technology of the present invention, makes simple, it is ensured that the solidification effect of thermosetting powder coating, particularly makes low
Warm cured powder paint, that is, easy to produce and process and being capable of long-term safety storage.It is easy to use, it is widely used, has filled up domestic skill
Art blank, allows the use scope of thermosetting powder coating to greatly increase.
Embodiment
With reference to embodiment, the present invention is described in detail.
The dedicated carbamide of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating is pre-
The technique of polymers, is in molar ratio 1:3~0.5:4 ratio weighs melamine and formalin, is stirred in three-necked flask
Mixing, it is 8~9 to add appropriate NaOH solution (1wt%) regulation system pH value, by melamino-formaldehyde mixed solution in 65~70
Heat and stir in DEG C water-bath, until system bleach, add the distilled water with the quality such as formalin, the reaction was continued 50min
It can obtain watersoluble melamine-formaldehyde pre-polymer of transparent low molecular weight.
The concentration of the formalin is 37%.
Watersoluble melamine-the formaldehyde pre-polymer when in use, is understood in external sheath ultrathin nanometer capsule protective layer,
Avoid participating in reacting in the powdery paints process segment, can be in powdery paints in use, the low-temperature setting reaction in later stage is participated in, to protect
Demonstrate,prove the effect of low-temperature setting.
The ultrathin nanometer capsule protective layer is Nanocrystal of the fusing point more than 65 degrees Celsius.
The above embodiment is the preferred embodiment of the present invention, is not for limiting the implementation of the present invention and right model
Enclose, the equivalence changes and modification that all contents according to described in the present patent application scope of patent protection are made, should all be included in this
In patent application the scope of the claims.
Claims (4)
1. the dedicated carbamide pre-polymerization of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating
The technique of thing, it is characterised in that：It is 1 in molar ratio:3~0.5:4 ratio weighs melamine and formalin, in three mouthfuls of burnings
It is stirred in bottle, it is 8~9 to add appropriate NaOH solution (1wt%) regulation system pH value, by melamino-formaldehyde mixed solution
Heat and stir in 65~70 DEG C of water-baths, until system bleach, the distilled water of the quality such as addition and formalin, continues anti-
50min is answered to can obtain watersoluble melamine-formaldehyde pre-polymer of transparent low molecular weight.
2. the ultrafine microencapsulated curing accelerator according to claim 1 for low-temperature setting thermosetting powder coating is special
Carbamide prepolymer technique, it is characterised in that the concentration of the formalin be 37%.
3. the ultrafine microencapsulated curing accelerator according to claim 1 for low-temperature setting thermosetting powder coating is special
Carbamide prepolymer technique, it is characterised in that the watersoluble melamine-formaldehyde pre-polymer when in use,
It can avoid participating in reacting in the powdery paints process segment, can make in powdery paints in external sheath ultrathin nanometer capsule protective layer
Used time, participates in the low-temperature setting reaction in later stage, to ensure the effect of low-temperature setting.
4. the ultrafine microencapsulated curing accelerator according to claim 3 for low-temperature setting thermosetting powder coating is special
Carbamide prepolymer technique, it is characterised in that the ultrathin nanometer capsule protective layer for fusing point at 65 degrees Celsius
Nanocrystal above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711400603.0A CN107936206A (en) | 2017-12-22 | 2017-12-22 | The technique of the dedicated melamino-formaldehyde prepolymer of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711400603.0A CN107936206A (en) | 2017-12-22 | 2017-12-22 | The technique of the dedicated melamino-formaldehyde prepolymer of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107936206A true CN107936206A (en) | 2018-04-20 |
Family
ID=61942667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711400603.0A Pending CN107936206A (en) | 2017-12-22 | 2017-12-22 | The technique of the dedicated melamino-formaldehyde prepolymer of ultrafine microencapsulated curing accelerator for low-temperature setting thermosetting powder coating |
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| CN (1) | CN107936206A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009134651A1 (en) * | 2008-04-28 | 2009-11-05 | E. I. Du Pont De Nemours And Company | Powder coating composition |
| CN105498652A (en) * | 2015-12-17 | 2016-04-20 | 华南理工大学 | Melamine resin and polyurea resin double-shell microcapsule and preparing method and application thereof |
| CN106867301A (en) * | 2017-02-16 | 2017-06-20 | 佛山市涂亿装饰材料科技有限公司 | A kind of thermosetting powder coating product and its application method for being exclusively used in low-temperature setting |
-
2017
- 2017-12-22 CN CN201711400603.0A patent/CN107936206A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009134651A1 (en) * | 2008-04-28 | 2009-11-05 | E. I. Du Pont De Nemours And Company | Powder coating composition |
| CN105498652A (en) * | 2015-12-17 | 2016-04-20 | 华南理工大学 | Melamine resin and polyurea resin double-shell microcapsule and preparing method and application thereof |
| CN106867301A (en) * | 2017-02-16 | 2017-06-20 | 佛山市涂亿装饰材料科技有限公司 | A kind of thermosetting powder coating product and its application method for being exclusively used in low-temperature setting |
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Application publication date: 20180420 |