CN114058250A - Coiled material powder coating and preparation method and application thereof - Google Patents

Coiled material powder coating and preparation method and application thereof Download PDF

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Publication number
CN114058250A
CN114058250A CN202111394537.7A CN202111394537A CN114058250A CN 114058250 A CN114058250 A CN 114058250A CN 202111394537 A CN202111394537 A CN 202111394537A CN 114058250 A CN114058250 A CN 114058250A
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powder coating
parts
coil powder
coil
coating
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陈嘉壕
欧阳建群
高庆福
肖龙和
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Qingtian Material Technology Co ltd
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Qingtian Material Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D167/00Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03Powdery paints
    • C09D5/033Powdery paints characterised by the additives

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention discloses a coil powder coating and a preparation method and application thereof. The coiled material powder coating comprises the following preparation raw materials in parts by weight: 50-100 parts of polyester resin and 15-30 parts of hydrogenated epoxy; the acid value of the polyester resin is 35-90 mgKOH/g; the melt viscosity at 200 ℃ is 2000-9000 mPas, and the epoxy equivalent of the hydrogenated epoxy resin is 500-1000 g/eq. The coil powder coating has excellent acid and alkali resistance, solvent resistance and oxidation resistance.

Description

Coiled material powder coating and preparation method and application thereof
Technical Field
The invention relates to the technical field of coatings, in particular to a coil powder coating and a preparation method and application thereof.
Background
At present, the environment-friendly coating is a necessary trend to replace the traditional paint with high VOC emission, the development speed of the environment-friendly coating is fast in the last 10 years, and the annual average use growth rate is 8% -15%. The powder coating is a novel, solvent-free, solid powdery environment-friendly coating, and has better environment-friendly performance compared with the traditional paint, so that the powder coating occupies an increasingly larger share in the coating market under the environment-friendly requirement.
The powder precoating plate can be applied to the factory building construction of the livestock breeding industry, such as the factory building of slaughter workshops and fermented food processing workshops. The environment in a factory building in the livestock breeding industry is complex, for example, acetic acid corrosive components and ammonia water are generated after animal manure is fermented, a large amount of hydrogen peroxide is required to be used for disinfection in a slaughtering workshop, the components corrode building materials of the factory building, and the components are firstly used as surface coatings of plates and the like. The corrosion protection properties of the coating can affect the life of the entire sheet and even the entire plant.
There is therefore a need for a coil powder coating having excellent acid, base, solvent and oxidation resistance.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. The coil powder coating provided by the invention has excellent acid and alkali resistance and solvent and oxidation resistance through compounding of raw materials.
The invention also provides a preparation method of the coil powder coating.
The invention also provides an anticorrosive coating, and the preparation raw materials comprise the coil powder coating.
The invention also provides a sheet material, and the preparation raw materials comprise the coil powder coating.
The invention also provides application of the anticorrosive coating in animal husbandry, agriculture and transportation industry.
According to one aspect of the invention, a coil powder coating is provided, which is prepared from the following raw materials: 50-100 parts of polyester resin and 15-30 parts of hydrogenated epoxy resin;
the acid value of the polyester resin is 35-90 mgKOH/g,
the melt viscosity of the polyester resin at 200 ℃ is 2000-9000 mPa & s,
the epoxy equivalent of the hydrogenated epoxy resin is 500-1000 g/eq.
The coil powder coating disclosed by the invention has at least the following beneficial effects:
the coil powder coating disclosed by the invention adopts the polyester resin with high crosslinking density, the dosage of monomers such as trimellitic acid, glycerol and the like in the resin is increased, so that the coil powder coating has good mechanical property and salt spray resistance, a base material is protected in place, and a small amount of hydrogenated epoxy resin is added, so that the coil powder coating can effectively react with the polyester resin, and the coating has a better crosslinking structure, thereby improving the acid-base resistance and weather resistance of the coating.
In some embodiments of the present invention, the preparing raw materials further comprises, in parts by weight: 0-10 parts of an auxiliary agent, 10-20 parts of a curing agent, 2-5 parts of a curing accelerator and 15-50 parts of a filler.
In some preferred embodiments of the present invention, the polyester resin has an acid value of 40 to 50 mgKOH/g.
In some preferred embodiments of the present invention, the polyester resin has a melt viscosity of 3500 to 4000mPa · s at 200 ℃.
In some preferred embodiments of the present invention, the hydrogenated epoxy resin has an epoxy equivalent weight of 800-1000 g/eq.
In some preferred embodiments of the present invention, the hydrogenated epoxy resin has a softening point of 85 to 95 ℃.
In some preferred embodiments of the present invention, the preparation raw materials comprise, by weight: 64-80 parts of polyester resin, 28 parts of hydrogenated epoxy, 10-20 parts of curing agent, 15-50 parts of filler, 0-10 parts of auxiliary agent and 2-5 parts of curing accelerator.
The coil powder coating has the advantages of quick curing, excellent acid and alkali resistance, solvent and oxidation resistance, and can be cured in a short time to form a coating. The adopted curing agent is combined with the curing accelerator, so that the curing time and the curing temperature can be effectively reduced, and the complete curing of the coating is ensured.
In some embodiments of the invention, the curing agent comprises: triglycidyl isocyanurate.
In some embodiments of the invention, the cure accelerator comprises: at least one of butyltriphenylphosphonium bromide and ethyltriphenylphosphonium bromide.
In some embodiments of the invention, the cure accelerator is butyltriphenylphosphonium bromide.
The curing accelerator can accelerate curing, and the invention can simultaneously realize rapid curing and complete crosslinking reaction with polyester resin in a short time by preferably selecting butyl triphenyl phosphonium bromide as the curing accelerator, so that the acid resistance, alkali resistance and solvent resistance and oxidation resistance of the curing accelerator meet the requirements.
In some embodiments of the invention, the filler comprises at least one of titanium dioxide and barium sulfate.
In some embodiments of the invention, the filler has a 45 μm test sieve residue of 0.01% or less.
In some embodiments of the invention, the adjuvant comprises a degassing agent.
In some embodiments of the invention, the adjuvant comprises a thickener.
In some embodiments of the invention, the air release agent comprises at least one of a breathable wax and a benzoin.
The second aspect of the invention provides a method for preparing a coil powder coating, which comprises the following steps:
s1: weighing the polyester resin and the hydrogenated epoxy resin, and performing mixed pressing to obtain a mixed material;
s2: and (5) crushing the mixed material in the step S1 to obtain the coil powder coating.
In some preferred embodiments of the present invention, the kneading of step S1 includes mixing, extruding: the mixed materials are processed by a double-screw extruder and tabletted: the molten extrudate is subjected to cold sheeting by means of a roller.
In some preferred embodiments of the present invention, the fumed silica is added while the mixed material is pulverized in step S2.
In some preferred embodiments of the present invention, in step S2, the fumed silica is added in an amount of 0.1% to 0.5% by mass of the coil powder coating.
The fumed silica is adapted to the powder storage environment of a customer, and different amounts of fumed silica are proportioned in different environments.
In some embodiments of the present invention, the coil powder coating in the step S2 has a particle size of 20 to 40 μm.
The third aspect of the invention provides an anticorrosive coating, and the preparation raw materials comprise the coil powder coating.
In some embodiments of the invention, the method of making the corrosion protective coating includes curing the coil powder coating after it is applied to a substrate.
In some embodiments of the invention, the curing temperature is 200 to 205 ℃,
in some embodiments of the present invention, the curing time is 2-5 min,
in some embodiments of the present invention, the thickness of the anti-corrosion coating is 35 to 45 μm.
A fourth aspect of the invention proposes the use of the corrosion protective coating in animal husbandry, agriculture and transportation.
In some embodiments of the invention, the use in said animal husbandry comprises the preparation of a boxed-type transfer container for livestock and feed comprising said corrosion-protective coating.
In some embodiments of the invention, the use in said animal husbandry comprises the preparation of a boxed-type transfer container for livestock and feed comprising said corrosion-protective coating.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Example 1
The embodiment prepares the coil powder coating, and the specific process is as follows:
s1: weighing 100 parts of polyester resin A, 28 parts of hydrogenated epoxy resin, 15 parts of rutile titanium dioxide, 35 parts of 228 barium, 3 parts of butyl triphenyl phosphine bromide, 5 parts of triglycidyl isocyanurate, 2 parts of flatting agent, 1.2 parts of breathable wax and 1 part of benzoin, uniformly mixing, and performing melt extrusion and tabletting at the rotating speed of 45hz by using a screw extruder at the temperature of 100 ℃ to obtain a mixed material.
S2: and (5) crushing the mixed material obtained in the step (S1), adding fumed silica accounting for 0.5% of the mass of the coil powder coating, and passing through a screen to obtain the coil powder coating with the particle size of 20-40 microns.
The polyester resin A is a prime test resin, the acid value of the polyester resin A is 45mgKOH/g, and the melt viscosity at 200 ℃ is 3800mPa & s;
the particle size of the rutile titanium dioxide is D50 ═ 0.1-0.5 mu m, and the particle size of the 228 barium is 8 mu m; the screen residue of the 45 mu m test sieve after all the fillers are mixed is less than or equal to 0.01 percent.
Comparative example 1
The comparative example prepares a coil powder coating, and the specific process is as follows:
s1: weighing 100 parts of polyester resin B, 15 parts of rutile titanium dioxide, 35 parts of 228 barium, 3 parts of benzyl trimethyl ammonium bromide, 7 parts of triglycidyl isocyanurate, 2 parts of flatting agent, 1.2 parts of breathable wax and 1 part of benzoin, uniformly mixing, and performing melt extrusion and tabletting by using a screw extruder to obtain a mixed material.
S2: and (3) crushing the mixed material, adding fumed silica accounting for 0.5% of the mass of the coil powder coating, and passing through a screen to obtain the coil powder coating with the particle size of 20-40 microns.
The polyester resin B was a resin for the Mount test, and had an acid value of 31mgKOH/g and a melt viscosity of 3000 mPas at 200 ℃.
The particle size of the rutile titanium dioxide is D50 ═ 0.1-0.5 mu m, and the particle size of the 228 barium is 8 mu m; the screen residue of the 45 mu m test sieve after all the fillers are mixed is less than or equal to 0.01 percent.
Comparative example 2
The comparative example prepares a coil powder coating, and the specific process is as follows:
s1: weighing 100 parts of polyester resin A, 15 parts of rutile titanium dioxide, 35 parts of 228 barium, 3 parts of benzyltriethylammonium chloride, 7 parts of triglycidyl isocyanurate, 2 parts of flatting agent, 1.2 parts of breathable wax and 1 part of benzoin, uniformly mixing, and performing melt extrusion and tabletting by using a screw extruder to obtain a mixed material.
S2: and (3) crushing the mixed material, adding fumed silica accounting for 0.5% of the mass of the coil powder coating, and passing through a screen to obtain the coil powder coating with the particle size of 20-40 microns.
The polyester resin B was a resin for the Mount test, and had an acid value of 31mgKOH/g and a melt viscosity of 3000 mPas at 200 ℃.
The particle size of the rutile titanium dioxide is D50 ═ 0.1-0.5 mu m, and the particle size of the 228 barium is 8 mu m; the screen residue of the 45 mu m test sieve after all the fillers are mixed is less than or equal to 0.01 percent.
Comparative example 3
The comparative example prepares a coil powder coating, and the specific process is as follows:
s1: weighing 100 parts of polyester resin A, 15 parts of rutile titanium dioxide, 35 parts of 228 barium, 3 parts of butyl triphenyl phosphine bromide, 7 parts of triglycidyl isocyanurate, 2 parts of flatting agent, 1.2 parts of breathable wax and 1 part of benzoin, uniformly mixing, and performing melt extrusion and tabletting by using a screw extruder to obtain a mixed material.
S2: and (3) crushing the mixed material, adding fumed silica accounting for 0.5% of the mass of the coil powder coating, and passing through a screen to obtain the coil powder coating with the particle size of 20-40 microns.
The polyester resin B was a resin for the Mount test, and had an acid value of 31mgKOH/g and a melt viscosity of 3000 mPas at 200 ℃.
The particle size of the rutile titanium dioxide is D50 ═ 0.1-0.5 mu m, and the particle size of the 228 barium is 8 mu m; the screen residue of the 45 mu m test sieve after all the fillers are mixed is less than or equal to 0.01 percent.
Comparative example 4
The comparative example prepares a coil powder coating, and the specific process is as follows:
s1: weighing 100 parts of polyester resin B, 15 parts of rutile titanium dioxide, 35 parts of 228 barium, 3 parts of butyl triphenyl phosphine bromide, 7 parts of triglycidyl isocyanurate, 2 parts of flatting agent, 1.2 parts of breathable wax and 1 part of benzoin, uniformly mixing, and performing melt extrusion and tabletting by using a screw extruder to obtain a mixed material.
S2: and (3) crushing the mixed material, adding fumed silica accounting for 0.5% of the mass of the coil powder coating, and passing through a screen to obtain the coil powder coating with the particle size of 20-40 microns.
The polyester resin B was a resin for the Mount test, and had an acid value of 31mgKOH/g and a melt viscosity of 3000 mPas at 200 ℃.
The particle size of the rutile titanium dioxide is D50 ═ 0.1-0.5 mu m, and the particle size of the 228 barium is 8 mu m; the screen residue of the 45 mu m test sieve after all the fillers are mixed is less than or equal to 0.01 percent.
Comparative example 5
The comparative example prepares a coil powder coating, and the specific process is as follows:
s1: weighing 100 parts of polyester resin B, 15 parts of rutile titanium dioxide, 35 parts of composite silicon micropowder, 3 parts of butyl triphenyl phosphine bromide, 7 parts of triglycidyl isocyanurate, 2 parts of flatting agent, 1.2 parts of breathable wax and 1 part of benzoin, uniformly mixing, and performing melt extrusion and tabletting by using a screw extruder to obtain a mixed material.
S2: and (3) crushing the mixed material, adding fumed silica accounting for 0.5% of the mass of the coil powder coating, and passing through a screen to obtain the coil powder coating with the particle size of 20-40 microns.
The polyester resin B was a resin for the Mount test, and had an acid value of 31mgKOH/g and a melt viscosity of 3000 mPas at 200 ℃.
The particle size of the rutile titanium dioxide is D50 ═ 0.1-0.5 mu m, and the particle size of the 228 barium is 8 mu m; the screen residue of the 45 mu m test sieve after all the fillers are mixed is less than or equal to 0.01 percent.
The formulations of the components of example 1 and comparative examples 1-5 are shown in Table 1.
TABLE 1 preparation of coil powder coating raw materials and parts by mass
Figure BDA0003369520910000061
Figure BDA0003369520910000071
Test examples
The prepared coil powder coating is coated on a common metal substrate by a high-voltage electrostatic method or a fluidized bed method, powder is sprayed by an electrostatic spray gun, and then the coil powder coating is put into an electric baking oven. The coating can be cured by an electric baking oven or a heat exchange furnace, the thickness of the coating is 35-45 mu m, and then the performance test is carried out according to the following standards, and the results are shown in Table 2:
1) gloss was tested according to GB/T9754;
2) the adhesion is tested according to GB/T9286;
3) the solvent resistance is tested according to GB/T1768-79;
4) impact resistance was tested according to GB/T1732;
5) neutral salt spray was tested according to GB/T1771-2007;
6) the xenon lamp exposure test was performed according to GB/T1865-2009;
7) the acid and alkali resistance was tested according to GB/T9274-1988;
8) the paint film hardness is tested according to GB/T6739-2006;
9) flexibility was tested according to GB/1731-;
TABLE 2 coating Performance test results
Figure BDA0003369520910000081
The test results show that compared with example 1, comparative example 1 and comparative example 2 have poor accelerating effects of the curing accelerators benzyltrimethyl ammonium bromide and benzyltriethyl ammonium chloride, so that the coating cannot meet the requirement of rapid curing, and the mechanical properties of the coating cannot meet the requirement, so that the coating is difficult to form a synergistic effect with other raw materials in the system.
The alkali resistance of the comparative example 3 is weaker than that of the example 1, because ester bonds produced by the reaction of the polyester resin and triglycidyl isocyanurate are easy to hydrolyze in an alkaline environment, and therefore, a small amount of hydrogenated epoxy is added into the example 1, so that the alkali resistance of the coating is improved.
The alkali resistance and ammonia water resistance of comparative example 4 are weaker than those of example 1, because the crosslinking density of the polyester resin A of example 1 is higher than that of the polyester resin B of comparative example 4, so the coil powder coating of comparative example 4 can not well protect the substrate from being corroded by ammonia water, and the ammonia water resistance can not reach the standard.
The alkali resistance and the ammonia water resistance of the comparative example 5 are weaker than those of the example 1, because the composite silica micropowder serving as the filler can be more uniformly dispersed in the coating, but the alkali resistance of the composite silica micropowder is poor, and the composite silica micropowder cannot achieve good alkali resistance.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. The coil powder coating is characterized by comprising the following preparation raw materials in parts by weight: 50-100 parts of polyester resin and 15-30 parts of hydrogenated epoxy resin;
the polyester resin has an acid value of 35 to 90mgKOH/g, a melt viscosity of 3000 to 5000mPa · s at 200 ℃,
the epoxy equivalent of the hydrogenated epoxy resin is 500-1000 g/eq.
2. The coil powder coating of claim 1, wherein the coil powder coating is prepared from raw materials comprising, in parts by weight: 0-10 parts of an auxiliary agent, 10-20 parts of a curing agent, 2-5 parts of a curing accelerator and 15-50 parts of a filler.
3. The coil powder coating as claimed in claim 1, wherein the particle size of the coil powder coating is 20 to 40 μm.
4. The coil powder coating of claim 2, wherein the curing agent comprises at least one of triglycidyl isocyanurate and hydroxyalkylamide.
5. The coil powder coating of claim 2, wherein the cure accelerator comprises at least one of butyltriphenylphosphonium bromide and ethyltriphenylphosphonium bromide.
6. The coil powder coating of claim 2, wherein the filler comprises at least one of titanium dioxide and barium sulfate.
7. The coil powder coating of claim 2, wherein the adjuvant comprises at least one of an air release agent and a thickener.
8. A method for preparing a coil powder coating as claimed in any one of claims 1 to 7, comprising the steps of:
s1, weighing the polyester resin and the hydrogenated epoxy resin, and mixing and pressing to obtain a mixed material;
and S2, crushing the mixed material in the step S1 to obtain the coil powder coating.
9. An anticorrosive coating, characterized in that the raw materials for preparation comprise the coil powder coating as claimed in any one of claims 1 to 7.
10. Use of a corrosion protective coating as claimed in claim 9 in animal husbandry, agriculture and transportation.
CN202111394537.7A 2021-11-23 2021-11-23 Coiled material powder coating and preparation method and application thereof Pending CN114058250A (en)

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CN116694187A (en) * 2023-06-26 2023-09-05 杭州老板电器股份有限公司 Corrosion-resistant molding powder and application thereof, corrosion-resistant oil net and preparation method

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CN116694187A (en) * 2023-06-26 2023-09-05 杭州老板电器股份有限公司 Corrosion-resistant molding powder and application thereof, corrosion-resistant oil net and preparation method

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Application publication date: 20220218