CN115651490A - Dry bumper dry powder coating and production process thereof - Google Patents
Dry bumper dry powder coating and production process thereof Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 113
- 239000000843 powder Substances 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 80
- 239000000049 pigment Substances 0.000 claims abstract description 23
- 239000000945 filler Substances 0.000 claims abstract description 22
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000003822 epoxy resin Substances 0.000 claims abstract description 12
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 12
- 230000003750 conditioning effect Effects 0.000 claims abstract description 11
- 229920001225 polyester resin Polymers 0.000 claims abstract description 11
- 239000004645 polyester resin Substances 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 24
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical group [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 20
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 230000036632 reaction speed Effects 0.000 claims description 9
- 239000004408 titanium dioxide Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical group O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims description 5
- 239000004593 Epoxy Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 238000007872 degassing Methods 0.000 claims description 5
- ZHPNWZCWUUJAJC-UHFFFAOYSA-N fluorosilicon Chemical group [Si]F ZHPNWZCWUUJAJC-UHFFFAOYSA-N 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 claims description 5
- 125000002636 imidazolinyl group Chemical group 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000004611 light stabiliser Substances 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000002987 primer (paints) Substances 0.000 abstract description 18
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 4
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 4
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
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- 230000002745 absorbent Effects 0.000 description 1
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- 239000011247 coating layer Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a dry bumping dry powder coating and a production process thereof, belonging to the technical field of powder coatings. The dry collision powder coating is characterized in that the anti-corrosion primer coating adopts the following raw materials in parts by weight: 60-70 parts of epoxy resin, 5-15 parts of curing agent, 1-3 parts of catalyst, 0.5-1.5 parts of flatting agent, 0.1-3 parts of assistant, 15-20 parts of pigment and 10-15 parts of filler; the weather-resistant coating is prepared from the following raw materials in parts by weight: 60-80 parts of polyester resin, 5-8 parts of curing agent, 3-6 parts of surface conditioning agent, 0.5-1.5 parts of flatting agent, 0.1-3 parts of auxiliary agent, 5-10 parts of pigment and 10-15 parts of filler; a production process of dry collision dry powder coating is characterized in that raw materials of an anticorrosion base coating and a weather-resistant surface coating are weighed and premixed, and are subjected to melt extrusion, tabletting and crushing. The invention realizes the two-coating one-baking process, and has high efficiency and energy saving.
Description
Technical Field
The invention relates to a dry bumper dry powder coating and a production process thereof, belonging to the technical field of powder coatings.
Background
At present, projects such as engineering machinery, offshore wind power, 5G base station photovoltaic solar supports and the like adopt a double-coating or multi-coating construction process to meet the use performance of corrosion resistance and weather resistance in order to achieve sufficient performance. Double-coating paint or powder coating needs to adopt a double-coating and double-baking process (primary coating-curing-surface coating-curing) to achieve complete curing of the product. The two-coating and two-baking process not only has low production efficiency, but also wastes energy and does not meet the national double-carbon requirement. For example, chinese patent publication nos. CN 110669368A and CN 110669368A disclose two-coat one-bake powder coatings, but the conventional two-coat one-bake products must require the color of the base coat and the top coat to be consistent to realize the true two-coat one-bake, otherwise the color mixing phenomenon will occur. The color of the base coat and the color of the top coat are limited in the actual production process, for example, the product must be customized, and the standardization is difficult, so that the color of the base coat and the color of the top coat cannot be really popularized and used in the industry.
In order to improve efficiency and reduce energy consumption, it is urgently needed to develop a dry-bumping and dry-baking technology to realize a two-coating and one-baking process so as to achieve the performance of a two-coating and two-baking product.
Disclosure of Invention
The invention aims to disclose a dry collision dry powder coating and a production process thereof, and the coating and the process can solve the problem of low efficiency and energy consumption caused by a two-coating and two-baking process in the prior art on the basis of meeting the excellent corrosion resistance and weather resistance of a coating.
The technical scheme of the invention is as follows:
the dry collision powder coating is characterized by comprising an anti-corrosion primer and a weather-resistant topcoat;
the anti-corrosion primer comprises the following raw materials in parts by weight: 60-70 parts of epoxy resin, 5-15 parts of curing agent, 1-3 parts of catalyst, 0.5-1.5 parts of flatting agent, 0.1-3 parts of auxiliary agent, 15-20 parts of pigment and 10-15 parts of filler; wherein the epoxy resin has an epoxy equivalent of 500-700g/eq and a softening point of 75-85 ℃; the curing agent is a phenol curing agent, the hydroxyl equivalent is 240-270 g/eq, and the softening point is 75-85 ℃;
the weather-resistant coating is prepared from the following raw materials in parts by weight: 60-80 parts of polyester resin, 5-8 parts of curing agent, 3-6 parts of surface conditioning agent, 0.5-1.5 parts of flatting agent, 0.1-3 parts of auxiliary agent, 5-10 parts of pigment and 10-15 parts of filler; wherein the polyester resin is super-weather-resistant grade slow-speed reaction resin with the viscosity of 80-100Pa.s, the acid value of 30-35mgKOH/g and the softening point of 120-130 ℃.
Specifically, in the anti-corrosion primer, the catalyst is an imidazoline catalyst capable of adjusting the reaction speed of the primer; the flatting agent is an acrylate flatting agent; the auxiliary agent is a degassing agent; the pigment is titanium dioxide, carbon black and the like; the filler is barium sulfate.
Specifically, in the weather-resistant topcoat, the curing agent is a TGIC or HAA curing agent; the surface conditioning agent is a fluorine-silicon modifier and is used for adjusting the polarity of the surface coating powder coating so that the powder is easier to float and move during curing; the flatting agent is an acrylate flatting agent; the auxiliary agent is a light stabilizer and an ultraviolet absorber; the pigment is titanium dioxide, iron yellow and iron black; the filler is barium sulfate.
A production process of dry collision dry powder coating is characterized by comprising the preparation of anticorrosion base coating and the preparation of weather-resistant surface coating;
the preparation method of the anti-corrosion primer comprises the following steps:
weighing the raw materials in proportion, premixing for 3-5 minutes by using a turnover mixer, and melting and extruding the premixed materials by using an extruder, wherein the extruder has the set temperature: first zone 75-85 ℃, second zone temperature: 70-80 ℃, three zones: 40-50 ℃, screw rotation speed: 400 revolutions per minute; because the reaction speed of the base coat is high, the gelation phenomenon is caused in the extrusion process of the base coat; and cooling the extruded material into sheet material by a tablet machine, crushing the sheet material into powder particles of 30-35 micrometers by an ACM (Acrylonitrile-butadiene-styrene) classified mill, and then packaging and warehousing the powder.
The preparation of the weather-resistant topcoat material comprises the following steps:
weighing the raw materials in proportion, premixing for 3-5 minutes by using a turnover mixer, and melting and extruding the premixed materials by using an extruder, wherein the set temperature of the extruder is as follows: temperature in the first zone: 120-130 ℃, temperature in the second zone: 110 ℃ to 120 ℃, and three-zone temperature: 90-100 ℃; and cooling the extruded material into sheet material by a tablet machine, crushing the sheet material into powder particles of 45-50 micrometers by an ACM (Acrylonitrile-butadiene-styrene) classified mill, and then packaging and warehousing the powder.
According to the dry collision dry powder coating, the formula design of the anti-corrosion primer coating and the weather-resistant top coating is adopted, so that the primer coating and the top coating generate a certain polarity difference, wherein the epoxy resin of the primer coating has a low softening point, when a workpiece enters a drying tunnel, the primer coating is fully melted and leveled when the temperature of the workpiece reaches above 80 ℃, and the top coating has a higher softening point, so that the top coating is continuously kept in a solid state when the primer coating is melted, and the primer coating and the top coating generate first layering; with the continuous rise of the temperature of the workpiece, when the temperature of the workpiece reaches above 130 ℃, the surface coating gradually starts to melt, and the surface coating gradually migrates to the surface of the coating film due to the strong mobility of the surface coating to form a second delamination; when the temperature of the workpiece reaches 140 ℃, the top coating basically and completely migrates to the surface of the workpiece, and simultaneously the bottom coating starts to enter a curing stage, the coating shrinks, and a cured film which does not flow any more is formed on the bottom coating. When the temperature of the workpiece is continuously increased to 190 ℃, the top coating powder continues to level and starts to solidify, and finally a top coating color effect with uniform color is formed on the surface of the workpiece. The dry powder collision process is similar to the oil-water layering principle in the spraying construction, and due to the polarity difference of the double-layer coating, the bottom coating sinks, and the top coating floats, so that the effect of layering of the two coatings is realized. Through the optimization of the premixing, extruding and crushing processes, various raw materials are fully and uniformly dispersed, and the coating has sufficient protective performance.
Compared with the traditional product, the paint of the invention has the remarkable technical effects that:
1. the bottom coating achieves the corrosion resistance and meets the corrosion prevention requirement of the product;
2. the top coating layer achieves the weather resistance, and the weather resistance requirement of the product is realized;
3. the two-coating one-baking process is realized through the specific formula design of the two layers of the primary coating and the surface coating, namely, the primary coating is sprayed firstly, the surface coating is sprayed secondly, then the primary coating and the surface coating are baked simultaneously, the layering effect of the primary coating and the surface coating can also be realized, and the phenomenon that the primary coating and the surface coating are mutually fused when two coated products are baked at the same time in the current market is avoided;
4. the softening point of the base coat is low, so that the surface coat is ensured to keep a solid infusible state when the base coat is molten; the particle size of the primary coating is fine, and the particle size of the top coating is coarse, so that the primary coating is ensured not to rise to a top coating space area when molten; the curing temperature of the primary coating is low, the reaction speed is high, the curing temperature of the surface coating is high, the reaction speed is low, the surface coating is still in a melting leveling stage after the primary coating is completely cured, and finally, the color of the primary coating cannot migrate to the surface coating during the curing of the surface coating, so that the weather resistance of a product is ensured.
Detailed Description
The following provides specific examples of the present invention to further illustrate the technical solutions of the present invention.
Example one
A dry collision dry powder coating comprises an anti-corrosion primer coating and a weather-resistant coating;
the formulations and preparation of the two coatings are described below, respectively:
the anti-corrosion primer adopts the following raw materials in parts by weight: 60 parts of epoxy resin, 5 parts of curing agent, 1 part of catalyst, 0.5 part of flatting agent, 0.1 part of auxiliary agent, 15 parts of pigment and 10 parts of filler; wherein the epoxy resin has an epoxy equivalent of 500g/eq and a softening point of 75 ℃; the curing agent is a phenolic curing agent, the hydroxyl equivalent weight is 240g/eq, and the softening point is 75 ℃; the catalyst is an imidazoline catalyst capable of adjusting the reaction speed of the base coat; the flatting agent is an acrylate flatting agent; the auxiliary agent is a degassing agent; the pigment is carbon black; the filler is barium sulfate.
The anti-corrosion primer is prepared by the following method: weighing the raw materials in proportion, premixing for 3-5 minutes by using a turnover mixer, and then melting and extruding the premixed materials by using an extruder, wherein the extruder is set at a temperature: first zone 75-85 ℃, second zone temperature: 70-80 ℃, three zones: 40-50 ℃, screw rotation speed: 400 revolutions per minute; because the reaction speed of the base coat is high, the gelation phenomenon is required to be noticed in the base coat extrusion process; and cooling the extruded material into sheet material by a tablet machine, crushing the sheet material into powder particles of 30-35 microns by an ACM (Acrylonitrile-butadiene-styrene) classified mill, and packaging the powder for storage.
The weather-resistant coating is prepared from the following raw materials in parts by weight: 80 parts of polyester resin, 8 parts of curing agent, 6 parts of surface conditioning agent, 1.5 parts of flatting agent, 3 parts of auxiliary agent, 10 parts of pigment and 15 parts of filler; wherein the polyester resin is a super-weather-resistant grade slow-speed reaction resin with the viscosity of 100Pa.s, the acid value of 35mgKOH/g and the softening point of 130 ℃. The curing agent is TGIC or HAA curing agent; the surface conditioning agent is a fluorine-silicon modifier and is used for adjusting the polarity of the surface coating powder coating so that the powder is easier to float and move during curing; the flatting agent is an acrylate flatting agent; the auxiliary agent is a light stabilizer and an ultraviolet absorbent; the pigment is titanium dioxide, iron yellow and iron black; the filler is barium sulfate.
The weather-resistant topcoat is prepared by the following method: weighing the raw materials in proportion, premixing for 3-5 minutes by using a turnover mixer, and then melting and extruding the premixed materials by using an extruder, wherein the set temperature of the extruder is as follows: temperature in the first zone: 120-130 ℃, temperature in the second zone: 110 ℃ to 120 ℃, and three-zone temperature: 90-100 ℃; and cooling the extruded material into sheet material by a tablet machine, crushing the sheet material into powder particles of 45-50 microns by an ACM (Acrylonitrile-butadiene-styrene) classified mill, and packaging the powder for storage.
Example two
The difference between the present embodiment and the first embodiment is that,
the anti-corrosion primer adopts the following raw materials in parts by weight: 70 parts of epoxy resin, 15 parts of curing agent, 3 parts of catalyst, 1.5 parts of flatting agent, 3 parts of auxiliary agent, 20 parts of pigment and 15 parts of filler; wherein the epoxy resin has an epoxy equivalent of 700g/eq and a softening point of 85 ℃; the curing agent is a phenol curing agent, the hydroxyl equivalent is 270g/eq, and the softening point is 85 ℃; the catalyst is an imidazoline catalyst capable of adjusting the reaction speed of the base coat; the flatting agent is an acrylate flatting agent; the auxiliary agent is a degassing agent; the pigment is titanium dioxide; the filler is barium sulfate.
The weather-resistant surface coating is prepared from the following raw materials in parts by weight: 60 parts of polyester resin, 5 parts of curing agent, 3 parts of surface conditioning agent, 0.5 part of flatting agent, 0.1 part of auxiliary agent, 5 parts of pigment and 10 parts of filler; wherein the polyester resin is a super-weather-resistant grade slow-speed reaction resin with the viscosity of 80Pa.s, the acid value of 30mgKOH/g and the softening point of 120 ℃. The curing agent is TGIC or HAA curing agent; the surface conditioning agent is a fluorine-silicon modifier and is used for adjusting the polarity of the surface coating powder coating so that the powder is easier to float and move during curing; the flatting agent is an acrylate flatting agent; the auxiliary agent is a light stabilizer and an ultraviolet absorber; the pigment is titanium dioxide, iron yellow and iron black; the filler is barium sulfate.
EXAMPLE III
The difference between the present embodiment and the first embodiment is that,
the anti-corrosion primer comprises the following raw materials in parts by weight: 65 parts of epoxy resin, 10 parts of curing agent, 2 parts of catalyst, 1 part of flatting agent, 2 parts of auxiliary agent, 18 parts of pigment and 12 parts of filler; wherein the epoxy resin has an epoxy equivalent of 600g/eq and a softening point of 80 ℃; the curing agent is a phenol curing agent, the hydroxyl equivalent is 250g/eq, and the softening point is 80 ℃; the catalyst is an imidazoline catalyst capable of adjusting the reaction speed of the base coat; the flatting agent is an acrylate flatting agent; the auxiliary agent is a degassing agent; the pigment is titanium dioxide; the filler is barium sulfate.
The weather-resistant coating is prepared from the following raw materials in parts by weight: 70 parts of polyester resin, 7 parts of curing agent, 5 parts of surface conditioning agent, 1 part of flatting agent, 1 part of auxiliary agent, 8 parts of pigment and 13 parts of filler; wherein the polyester resin is super-weather-resistant grade slow-speed reaction resin with the viscosity of 90Pa.s, the acid value of 32mgKOH/g and the softening point of 125 ℃. The curing agent is TGIC or HAA curing agent; the surface conditioning agent is a fluorine-silicon modifier and is used for adjusting the polarity of the surface coating powder coating so that the powder is easier to float and move during curing; the flatting agent is an acrylate flatting agent; the auxiliary agent is a light stabilizer and an ultraviolet absorber; the pigment is titanium dioxide, iron yellow and iron black; the filler is barium sulfate.
The results of the primer in this example after correlation testing are shown in table 1.
TABLE 1 first coat test results
In the present example, the top coating is subjected to correlation detection, and the detection results are shown in table 2.
Table 2 surface coating test results
The performance of the conventional two-coat and two-bake coating film and the two-coat and one-bake coating film of the embodiment is tested and compared as follows:
the performance of the conventional two-coat and two-bake coating film is shown in table 3.
TABLE 3 Performance of conventional two coat two bake coatings
The performance of the two-coat one-bake coating film of this example was tested as shown in Table 4.
TABLE 4 two coat one bake coating Performance of this example
The conventional coating and the dry-on-dry coating of this example were subjected to a dry-mix spray bake and a two-coat one bake, respectively, and the results of the migration test were:
the white conventional bottom coating and the black conventional top coating are subjected to dry-mixing spraying and baking according to the ratio of 50;
the white conventional base coat and the black conventional surface coat are coated and baked at two times, the base coat and the surface coat are mixed, and the color of the coating is mixed color;
the white dry-to-dry base coat and the black dry-to-dry surface coat are subjected to dry mixing, spraying and baking according to the ratio of 50;
white dry touch dry bottom coating and black dry touch dry surface coating, wherein the two coatings are baked, and the black surface coating completely migrates to the surface of the coating.
The conclusion shows that the invention realizes the two-coating one-baking process while achieving the corrosion resistance and the weather resistance, thereby not only improving the production efficiency, but also saving the energy consumption and contributing the strength to the realization of double carbon; the two-coating one-baking powder technology further promotes the environment-friendly powder coating to replace the traditional paint, reduces VOC emission and realizes the concept of environmental protection.
Claims (4)
1. The dry collision powder coating is characterized by comprising an anti-corrosion base coating and a weather-resistant surface coating;
the anti-corrosion primer adopts the following raw materials in parts by weight: 60-70 parts of epoxy resin, 5-15 parts of curing agent, 1-3 parts of catalyst, 0.5-1.5 parts of flatting agent, 0.1-3 parts of auxiliary agent, 15-20 parts of pigment and 10-15 parts of filler; wherein the epoxy resin has an epoxy equivalent of 500-700g/eq and a softening point of 75-85 ℃; the curing agent is a phenolic curing agent, the hydroxyl equivalent weight is 240-270 g/eq, and the softening point is 75-85 ℃;
the weather-resistant surface coating is prepared from the following raw materials in parts by weight: 60-80 parts of polyester resin, 5-8 parts of curing agent, 3-6 parts of surface conditioning agent, 0.5-1.5 parts of flatting agent, 0.1-3 parts of auxiliary agent, 5-10 parts of pigment and 10-15 parts of filler; wherein the polyester resin is super-weather-resistant grade slow-speed reaction resin with the viscosity of 80-100Pa.s, the acid value of 30-35mgKOH/g and the softening point of 120-130 ℃.
2. The dry impact powder coating of claim 1,
in the anti-corrosion primer, the catalyst is an imidazoline catalyst capable of adjusting the reaction speed of the primer; the flatting agent is an acrylate flatting agent; the auxiliary agent is a degassing agent; the pigment is titanium dioxide or carbon black; the filler is barium sulfate.
3. The dry impact powder coating of claim 1,
in the weather-resistant coating, the curing agent is TGIC or HAA curing agent; the surface conditioning agent is a fluorine-silicon modifier and is used for adjusting the polarity of the surface coating powder coating so that the powder is easier to float and move during curing; the flatting agent is an acrylate flatting agent; the auxiliary agent is a light stabilizer and an ultraviolet absorber; the pigment is titanium dioxide, iron yellow or iron black pigment; the filler is barium sulfate.
4. A process for producing a dry impact dry powder coating according to any one of claims 1 to 3, which comprises the preparation of an anti-corrosive primer and the preparation of a weather-resistant top coating;
the preparation method of the anti-corrosion primer comprises the following steps: weighing raw materials in proportion, premixing, and carrying out melt extrusion on the premixed materials through an extruder, wherein the extruder is set at a temperature: first zone 75-85 ℃, second zone temperature: 70-80 ℃, three zones: 40-50 ℃, screw rotation speed: 400 revolutions per minute; cooling the extruded material into sheet material by a tablet machine, and crushing into powder particles of 30-35 microns;
the preparation of the weather-resistant topcoat material comprises the following steps: weighing the raw materials in proportion, premixing, and carrying out melt extrusion on the premixed materials through an extruder, wherein the set temperature of the extruder is as follows: temperature in the first zone: 120-130 ℃, temperature in the second zone: 110 ℃ to 120 ℃, and three-zone temperature: 90-100 ℃; cooling the extruded material into sheet material by a tablet machine, and crushing into 45-50 micron powder particles.
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