CN118515877A - Preparation method of polyester modified epoxy resin for coiled material primer - Google Patents
Preparation method of polyester modified epoxy resin for coiled material primer Download PDFInfo
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- CN118515877A CN118515877A CN202410566967.XA CN202410566967A CN118515877A CN 118515877 A CN118515877 A CN 118515877A CN 202410566967 A CN202410566967 A CN 202410566967A CN 118515877 A CN118515877 A CN 118515877A
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- Prior art keywords
- epoxy resin
- polyester
- modified epoxy
- resin
- reaction
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 67
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 67
- 229920000728 polyester Polymers 0.000 title claims abstract description 58
- 239000000463 material Substances 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 239000003973 paint Substances 0.000 claims abstract description 35
- 239000004645 polyester resin Substances 0.000 claims abstract description 29
- 229920001225 polyester resin Polymers 0.000 claims abstract description 29
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000037452 priming Effects 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000004593 Epoxy Substances 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims abstract description 4
- 239000000049 pigment Substances 0.000 claims abstract description 4
- 238000006068 polycondensation reaction Methods 0.000 claims abstract description 4
- 238000007142 ring opening reaction Methods 0.000 claims abstract description 4
- 239000002987 primer (paints) Substances 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 13
- 239000003085 diluting agent Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- WEHZNZTWKUYVIY-UHFFFAOYSA-N 3-oxabicyclo[3.2.2]nona-1(7),5,8-triene-2,4-dione Chemical compound O=C1OC(=O)C2=CC=C1C=C2 WEHZNZTWKUYVIY-UHFFFAOYSA-N 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 5
- IZXIZTKNFFYFOF-UHFFFAOYSA-N 2-Oxazolidone Chemical compound O=C1NCCO1 IZXIZTKNFFYFOF-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- 238000005809 transesterification reaction Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 6
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000006116 polymerization reaction Methods 0.000 abstract description 4
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract description 3
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 abstract description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The invention discloses a preparation method of polyester modified epoxy resin for coiled material priming paint, which relates to the technical field of paint processing, linear polyester resin with proper polymerization degree is prepared by phthalic anhydride and propylene glycol, the polyester resin and the epoxy resin are subjected to polycondensation reaction to generate polyester prepolymer, the epoxy resin and the polyester prepolymer are subjected to epoxy ring-opening reaction to generate polyester modified epoxy resin, and fillers, pigments and flatting agents are added, and then impurities are removed and diluted to prepare the polyester modified epoxy resin for coiled material priming paint. The modified epoxy resin prepared by the invention has the advantages of both epoxy resin and polyester resin, and the prepared paint film has good adhesive force, high flexibility, excellent corrosion resistance, high hardness and good shock resistance, has excellent resin and paint storage stability, and can meet various performance requirements of priming paint for coiled materials.
Description
Technical Field
The invention relates to the technical field of coating processing, in particular to a preparation method of polyester modified epoxy resin for coiled material priming paint.
Background
The coiled material primer is a common paint used in construction, and is mainly used for basic treatment and adhesion enhancement of various coiled materials. The paint can improve the adhesive force of the finish paint, increase the fullness of the finish paint, provide alkali resistance and corrosion resistance, and ensure uniform absorption of the finish paint, thereby enabling the whole paint system to exert the best effect. The primer and the finish paint have different functions, the finish paint focuses on final decoration and apparent effects, and the primer focuses on improving adhesive force, anti-corrosion function, alkali resistance and the like.
Coil primers are of a wide variety and commonly used include epoxy primers, polyester primers (such as polyester-amino primers and polyester-polyurethane primers), water-soluble acrylic primers, and the like. The primer has various characteristics, such as good adhesion between the epoxy primer and a substrate, and good water resistance, alkali resistance and chemical corrosion resistance; the adhesion between the polyester-amino primer and the substrate is good, and the flexibility is excellent; the water-soluble acrylic primer contains less organic solvent and is cured at low temperature, but is not suitable for storage in a wet environment, and the pretreatment requirement is high.
At present, when preparing coiled material primer coating, a physical modification method is often utilized to mix epoxy resin and saturated polyester resin to prepare paint so as to improve the flexibility of a paint film. However, the compatibility of the epoxy resin and the polyester resin is not good, the storage stability of the paint is poor, the paint is layered, and the T-bend and impact resistance of the coating film are poor.
Disclosure of Invention
The invention aims to solve the technical problems that the existing primer is poor in stability, so that the paint is layered, and the T-bend and impact resistance of a coating film are poor.
In order to solve the problems, the technical scheme of the invention is as follows: a preparation method of polyester modified epoxy resin for coiled material priming paint comprises the following steps:
S1, preparing raw materials, namely preparing necessary raw materials such as polyester raw materials, epoxy resin, a modifier, a stabilizer, a catalyst, a curing agent, a diluent, auxiliary materials and the like;
S2, preparing polyester resin, namely adding a polyester raw material into a reaction kettle according to a certain proportion, adding a proper amount of catalyst, heating and stirring to enable the polyester raw material to undergo transesterification reaction, and thus obtaining linear polyester resin;
S3, preparing a polyester prepolymer, namely mixing polyester resin and epoxy resin according to a certain proportion, adding a proper amount of catalyst and curing agent, and carrying out a heating reaction to enable the polyester resin and the epoxy resin to carry out a polycondensation reaction to generate the polyester prepolymer;
S4, preparing polyester modified epoxy resin, namely mixing polyester prepolymer with additional epoxy resin according to a certain proportion, adding a proper amount of catalyst, curing agent and diluent, and carrying out heating and stirring reaction to enable the epoxy resin and the polyester prepolymer to carry out epoxy ring-opening reaction to generate polyester modified epoxy resin;
S5, designing a primer formula, namely designing a primer formula according to the characteristic requirement and the application requirement of the coiled material primer, and adding auxiliary materials into the polyester modified epoxy resin according to the formula;
s6, removing impurities and diluting, cooling the reaction kettle after the reaction is completed, filtering liquid to remove the impurities, and then adding a diluent for diluting to prepare the polyester modified epoxy resin for the coiled material primer.
Further, the polyester raw materials in the step S1 comprise terephthalic anhydride and propylene glycol, the epoxy resin is modified by oxazolidone, the molar ratio of the terephthalic anhydride to the propylene glycol in the polyester raw materials in the step S2 is 1:1.1-1.5, the reaction temperature is 180-200 ℃, and the reaction time is 2-4 hours.
Further, in the step S3, the molar ratio of the polyester resin to the epoxy resin is 1:1.1-1.5, the reaction temperature is 60-80 ℃, and the reaction time is 1-2 hours.
Further, in the step S4, the molar ratio of the polyester resin to the epoxy resin is 1:0.8-1.2, the reaction temperature is 150-180 ℃, and the reaction time is 1-2 hours.
Further, the auxiliary materials in the step S1 comprise a filler, a pigment and a leveling agent, the auxiliary materials are added into the polyester modified epoxy resin prepared in the step S4, and the reaction temperature in the step S4 is kept for continuous reaction.
Further, the solid content of the polyester modified epoxy resin for coil priming paint is 20-30%.
Compared with the prior art, the invention has the advantages that: according to the invention, the linear polyester resin with proper polymerization degree is prepared by phthalic anhydride and propylene glycol, the epoxy group of the epoxy resin is utilized to react with the hydroxyl or carboxyl on the linear polyester resin, and the flexible polyester resin is grafted onto the epoxy resin, so that the newly prepared modified epoxy resin has the advantages of both the epoxy resin and the polyester resin, and the prepared paint film has good adhesive force, high flexibility, excellent corrosion resistance, high hardness and good impact resistance, has excellent resin and paint storage stability, and can meet various performance requirements of the priming paint for coiled materials.
Detailed Description
The following description of the embodiments of the present invention will be made in detail, but clearly, the embodiments are illustrative only and not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A preparation method of polyester modified epoxy resin for coiled material priming paint comprises the following steps:
S1, preparing raw materials, namely preparing necessary raw materials such as polyester raw materials, epoxy resin, a modifier, a stabilizer, a catalyst, a curing agent, a diluent, auxiliary materials and the like;
s2, preparing polyester resin, namely adding terephthalic anhydride and propylene glycol into a reaction kettle according to the proportion of 1:1.2, adding a catalyst, gradually heating to 180 ℃ and stirring to enable the catalyst to undergo transesterification reaction, and obtaining the polyester resin, wherein in the reaction process, formaldehyde and water generated are gradually distilled out to promote the polymerization of the polyester raw material, and finally obtaining the linear polyester resin with proper polymerization degree.
S3, preparing a polyester prepolymer, namely mixing polyester resin and epoxy resin according to the proportion of 1:1.2, adding a catalyst and a curing agent, uniformly stirring and gradually heating to 80 ℃ to enable the polyester resin and the epoxy resin to undergo polycondensation reaction to generate the polyester prepolymer, wherein the epoxy resin is modified by oxazolidone;
s4, preparing polyester modified epoxy resin, namely mixing polyester prepolymer with additional epoxy resin according to the proportion of 1:1.1, adding a proper amount of catalyst, curing agent and diluent, uniformly stirring, and gradually heating to 180 ℃ to enable the epoxy resin and the polyester prepolymer to perform epoxy ring-opening reaction to generate polyester modified epoxy resin;
S5, designing a primer formula, namely designing the primer formula according to the characteristic requirement and the application requirement of the coiled material primer, and adding a filler, a pigment and a leveling agent into the polyester modified epoxy resin prepared in the step S4;
S6, removing impurities and diluting, cooling the reaction kettle after the reaction is finished, filtering liquid to remove the impurities, then adding a diluent to dilute so that the solid content in the polyester modified epoxy resin is 30%, preparing the polyester modified epoxy resin for coil priming paint, and adjusting the viscosity of the system through the diluent to ensure the operability in the construction process and the quality of the priming paint.
In specific use, epoxy groups of the epoxy resin react with hydroxyl groups or carboxyl groups on the linear polyester resin, and the flexible polyester resin is grafted onto the epoxy resin, so that the newly prepared modified epoxy resin has the advantages of the epoxy resin and the polyester resin, and the prepared paint film has good adhesive force, high flexibility, excellent corrosion resistance, high hardness, good impact resistance, excellent resin and paint storage stability, and can meet various performance requirements of priming paint for coiled materials.
The parts which are not disclosed in the invention are all the prior art, and the specific structure and the working principle are not repeated.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The invention and its embodiments have been described above without limitation. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (6)
1. The preparation method of the polyester modified epoxy resin for the coil primer is characterized by comprising the following steps of:
S1, preparing raw materials, namely preparing necessary raw materials such as polyester raw materials, epoxy resin, a modifier, a stabilizer, a catalyst, a curing agent, a diluent, auxiliary materials and the like;
S2, preparing polyester resin, namely adding a polyester raw material into a reaction kettle according to a certain proportion, adding a proper amount of catalyst, heating and stirring to enable the polyester raw material to undergo transesterification reaction, and thus obtaining linear polyester resin;
S3, preparing a polyester prepolymer, namely mixing polyester resin and epoxy resin according to a certain proportion, adding a proper amount of catalyst and curing agent, and carrying out a heating reaction to enable the polyester resin and the epoxy resin to carry out a polycondensation reaction to generate the polyester prepolymer;
S4, preparing polyester modified epoxy resin, namely mixing polyester prepolymer with additional epoxy resin according to a certain proportion, adding a proper amount of catalyst, curing agent and diluent, and carrying out heating and stirring reaction to enable the epoxy resin and the polyester prepolymer to carry out epoxy ring-opening reaction to generate polyester modified epoxy resin;
S5, designing a primer formula, namely designing a primer formula according to the characteristic requirement and the application requirement of the coiled material primer, and adding auxiliary materials into the polyester modified epoxy resin according to the formula;
s6, removing impurities and diluting, cooling the reaction kettle after the reaction is completed, filtering liquid to remove the impurities, and then adding a diluent for diluting to prepare the polyester modified epoxy resin for the coiled material primer.
2. The method for preparing the polyester modified epoxy resin for coil priming paint according to claim 1, wherein the method comprises the following steps: the polyester raw materials in the step S1 comprise terephthalic anhydride and propylene glycol, the epoxy resin is modified by oxazolidone, the molar ratio of the terephthalic anhydride to the propylene glycol in the polyester raw materials in the step S2 is 1:1.1-1.5, the reaction temperature is 180-200 ℃, and the reaction time is 2-4 hours.
3. The method for preparing the polyester modified epoxy resin for coil priming paint according to claim 1, wherein the method comprises the following steps: in the step S3, the molar ratio of the polyester resin to the epoxy resin is 1:1.1-1.5, the reaction temperature is 60-80 ℃, and the reaction time is 1-2 hours.
4. The method for preparing the polyester modified epoxy resin for coil priming paint according to claim 1, wherein the method comprises the following steps: in the step S4, the molar ratio of the polyester resin to the epoxy resin is 1:0.8-1.2, the reaction temperature is 150-180 ℃, and the reaction time is 1-2 hours.
5. The method for preparing the polyester modified epoxy resin for coil primer according to claim 5, wherein the method comprises the following steps: the auxiliary materials in the step S1 comprise filler, pigment and flatting agent, the auxiliary materials are added into the polyester modified epoxy resin prepared in the step S4, and the reaction temperature in the step S4 is kept for continuous reaction.
6. The method for preparing the polyester modified epoxy resin for coil priming paint according to claim 1, wherein the method comprises the following steps: the solid content of the polyester modified epoxy resin for the coiled material primer is 20-30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410566967.XA CN118515877A (en) | 2024-05-09 | 2024-05-09 | Preparation method of polyester modified epoxy resin for coiled material primer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410566967.XA CN118515877A (en) | 2024-05-09 | 2024-05-09 | Preparation method of polyester modified epoxy resin for coiled material primer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118515877A true CN118515877A (en) | 2024-08-20 |
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| CN202410566967.XA Pending CN118515877A (en) | 2024-05-09 | 2024-05-09 | Preparation method of polyester modified epoxy resin for coiled material primer |
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| CN (1) | CN118515877A (en) |
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- 2024-05-09 CN CN202410566967.XA patent/CN118515877A/en active Pending
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