CN110256949B - High-adhesion extinction powder coating and preparation method thereof - Google Patents
High-adhesion extinction powder coating and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 62
- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 239000000843 powder Substances 0.000 title claims abstract description 53
- 230000008033 biological extinction Effects 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 29
- 150000004756 silanes Chemical class 0.000 claims abstract description 25
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000049 pigment Substances 0.000 claims abstract description 6
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims abstract description 5
- -1 2, 3-epoxypropoxy Chemical group 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 5
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical group [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 244000028419 Styrax benzoin Species 0.000 claims description 2
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 2
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 2
- 229960002130 benzoin Drugs 0.000 claims description 2
- 238000007872 degassing Methods 0.000 claims description 2
- 235000019382 gum benzoic Nutrition 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims 6
- 239000004645 polyester resin Substances 0.000 claims 6
- 150000001875 compounds Chemical class 0.000 claims 1
- 229920005749 polyurethane resin Polymers 0.000 abstract description 17
- 229920005989 resin Polymers 0.000 abstract description 16
- 239000011347 resin Substances 0.000 abstract description 16
- 239000000758 substrate Substances 0.000 abstract description 12
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 239000011521 glass Substances 0.000 abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 5
- 239000010935 stainless steel Substances 0.000 abstract description 5
- 235000013305 food Nutrition 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007590 electrostatic spraying Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a high-adhesion extinction powder coating and a preparation method thereof, wherein the high-adhesion extinction powder coating comprises the following raw materials in percentage by weight: 10% of modified resin, 20-30% of curing agent, 20-30% of low hydroxyl value polyurethane resin, 20-30% of high hydroxyl value polyurethane resin, 10-30% of pigment and filler and 0.5-2% of auxiliary agent; the preparation method of the modified resin comprises the following steps: mixing the modified silane coupling agent and the low-hydroxyl polyurethane resin, performing melt extrusion through a double-screw extruder, tabletting and crushing to obtain the modified silane coupling agent; the preparation method of the modified silane coupling agent comprises the following steps: mixing gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) ethoxy diethoxy phosphate, and reacting at 60 deg.C for 2 hr. The extinction powder coating has stable glossiness, excellent leveling effect, excellent coating hardness and strong adhesive force to substrates which are difficult to adhere, such as glass, stainless steel, galvanized sheets and the like. Can be suitable for areas such as outdoor coastal areas; meets the requirement of food safety, and can be used for coating and decorating articles such as kitchen utensils, catering utensils and the like.
Description
Technical Field
The invention relates to the technical field of chemical coating material preparation, in particular to a high-adhesion extinction powder coating and a preparation method thereof.
Background
The powder coating is an environment-friendly green coating completely free of organic solvent, exists in a micro powder form, is applied on the surface of a heated substrate by adopting an electrostatic spraying technology, and is melted to form a film. Compared with the traditional solvent-based coating, the powder coating has no solvent pollution, convenient coating, high curing speed and excellent coating performance, and is a high and new technology developed from the 20 th century and the 60 th year. However, most of the existing powder coatings have the defects of poor surface leveling, unstable gloss of a dull coating, poor weather resistance, incapability of meeting food safety requirements and the like; and the general powder coating only has good adhesive force to iron-based and aluminum-based substrates, but has poor adhesive force to some special substrates (such as glass, galvanized plates, stainless steel and the like) and poor water resistance.
Disclosure of Invention
In order to solve the technical problems, the invention provides the high-adhesion extinction powder coating which meets the food safety requirements and has good weather resistance, stable extinction, excellent leveling property and good hardness, and the preparation method thereof.
The technical scheme adopted by the invention is as follows:
a high-adhesion extinction powder coating comprises the following raw materials in percentage by weight:
10% of modified resin;
20-30% of low hydroxyl value polyurethane resin;
20-30% of high hydroxyl value polyurethane resin;
20-30% of curing agent;
0.5% of pigment;
10-30% of filler;
0.5 to 2 percent of auxiliary agent.
The preparation method of the modified resin comprises the following steps: mixing the modified silane coupling agent and the low-hydroxyl polyurethane resin, performing melt extrusion through a double-screw extruder, tabletting and crushing to obtain the modified silane coupling agent.
Further, the temperature of the melt extrusion was 100 ℃.
The preparation method of the modified silane coupling agent comprises the following steps: mixing gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) ethoxy diethoxy phosphate, and reacting at 60 deg.C for 2 hr.
Furthermore, the molar ratio of the gamma-aminopropyltriethoxysilane to the gamma- (2, 3-epoxypropoxy) ethoxydiethoxy phosphate is 1: 1-1.2.
The weight percentages of the modified silane coupling agent and the low-hydroxyl polyurethane resin are respectively 85% and 15%.
The low hydroxyl value polyurethane resin and the high hydroxyl value polyurethane resin are respectively SJ1100 and SJ 1800.
The curing agent is polyurethane powder coating curing agent B1530.
The pigment is carbon black; the filler is aluminum hydroxide.
The auxiliary agent comprises benzoin degassing agent and flatting agent GLP 588.
The invention also provides a preparation method of the high-adhesion extinction powder coating, which comprises the following steps: mixing the raw materials according to the formula ratio by a mixer, melting and extruding the mixture into sheets by a double-screw extruder at the temperature of 115 ℃, grinding the sheets into powder by a mill, and finally sieving the powder by a 200-mesh sieve to obtain the high-adhesion matting powder coating.
The application method of the high-adhesion extinction powder coating comprises the following steps: spraying high-adhesion extinction powder coating on the sample plate by an electrostatic spray gun, and baking for 15min at the temperature of 200 ℃ by an oven for curing and forming.
In the formula of the high-adhesion extinction powder coating, firstly, the modified silane coupling agent is prepared from gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) ethoxy diethoxy phosphate, in the reaction, primary amino group with high reaction speed is replaced by secondary amino group with lower reaction activity, so that the orange peel problem of a coating film after a final coating is cured to form a film is reduced, phosphate groups in a product can provide excellent adhesion of the coating film to metal substrates (such as galvanized plates and stainless steel), and silane can provide excellent adhesion of the coating film to non-metal substrates (such as glass and ceramic). The synthesis equation of the modified silane coupling agent is as follows:
and then extruding and crushing the modified silane coupling agent and a certain amount of low-hydroxyl resin by a double-screw extruder to obtain the modified resin. The obtained modified resin can fully disperse the liquid silane coupling agent in the whole resin system, and can make the adhesive force of the cured coating more uniform. And solid modified resin can be convenient for the material of throwing in the production and replenishing and resin can wrap up liquid modified auxiliary agent at the periphery well and isolate air and be convenient for prolong storage time. And after the secondary amino group in the modified silane coupling agent existing in the modified resin reacts with the isocyanate group in the curing agent B1530, an integrated network structure can be formed, and meanwhile, the group on the other side is linked with the substrate through hydrogen bonds and covalent bonds, so that the adhesive force can be remarkably improved, as shown in the following:
compared with the prior art, the high-adhesion extinction powder coating prepared by the invention has stable glossiness, excellent leveling effect, excellent coating hardness and strong adhesion to substrates difficult to adhere, such as glass, stainless steel, galvanized plates and the like. Can be suitable for areas such as outdoor coastal areas; the product has been approved by FDA, meets the requirement of food safety, and can be used for coating and decorating articles such as kitchen utensils, catering utensils and the like.
Drawings
FIG. 1 is an infrared spectrum of a modified silane coupling agent.
Detailed Description
The present invention will be described in detail with reference to examples.
The raw material manufacturers used in the invention are as follows:
low hydroxyl value polyurethane resin SJ 1100: anhui Shen Jian New Material Co Ltd
High hydroxyl number polyurethane resin SJ 1800: anhui Shen Jian New Material Co Ltd
Polyurethane powder coating curing agent B1530: germany Bayer Process
Leveling agent GLP 588: ningbo south sea Fenghua Co Ltd
γ - (2, 3-epoxypropoxy) ethoxydiethoxyphosphate: mount Huang Xinjia Fine materials Co Ltd
Examples 1 to 3
A high-adhesion extinction powder coating comprises the following raw materials in percentage by weight as shown in examples 1-3 in Table 1:
TABLE 1
| Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Modified polyester | 100 portions of | 100 portions of | 100 portions of | / | / | / |
| Low hydroxyl number polyurethane resins | 200 portions of | 240 portions of | 200 portions of | 300 portions of | 300 portions of | 300 portions of |
| High hydroxyl number polyurethane resins | 200 portions of | 250 portions of | 260 portions of | 200 portions of | 200 portions of | 200 portions of |
| Polyurethane curing agent B1530 | 270 portions of | 240 portions of | 220 portions of | 270 portions of | 270 portions of | 270 portions of |
| Carbon black pigment | 5 portions of | 5 portions of | 5 portions of | 5 portions of | 5 portions of | 5 portions of |
| Aluminum hydroxide | 210 portions of | 150 portions of | 197 parts by weight | 210 portions of | 210 portions of | 210 portions of |
| Flatting agent GLP588 | 10 portions of | 8 portions of | 12 portions of | 10 portions of | 10 portions of | 10 portions of |
| Benzoinum as degasifier | 5 portions of | 7 portions of | 6 portions of | 5 portions of | 5 portions of | 5 portions of |
| Silane coupling agent | / | / | / | 15 portions of | / | / |
| Modified silane coupling agent | / | / | / | / | 15 portions of | / |
The preparation method of the high-adhesion extinction powder coating comprises the following steps:
(1) preparation of modified polyester: mixing 15% of modified silane coupling agent and 85% of low-hydroxyl polyurethane resin, performing melt extrusion at 100 ℃ by a double-screw extruder, tabletting and crushing to prepare modified resin; the preparation method of the modified silane coupling agent comprises the following steps: mixing gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) ethoxydiethoxyphosphate at a molar ratio of 1:1, and reacting at 60 deg.C for 2h to obtain the modified silane coupling agent with an infrared spectrum shown in FIG. 1.
(2) Mixing the raw materials according to the formula ratio by a mixer, melting and extruding the mixture into sheets by a double-screw extruder, grinding the sheets into powder by a mill, and finally sieving the powder by a 200-mesh sieve to obtain the high-adhesion extinction powder coating.
Comparative examples 1 to 3
A powder coating comprises the raw materials in percentage by weight shown in comparative examples 1-3 in Table 1, and the preparation method comprises the following steps: mixing the raw materials according to the formula ratio by a mixer, melting and extruding the mixture into sheets by a double-screw extruder, grinding the sheets into powder by a mill, and finally sieving the powder by a 200-mesh sieve to obtain the powder coating.
Comparative example 4
A powder coating, otherwise the same as example 1, except that the modified silane coupling agent in step (1) was prepared by the following method: prepared by dripping KH560 into KH550 at 60 ℃ for reaction for 1.5 h.
Comparative example 5
A powder coating was prepared as described in example 1 except that the modified silane coupling agent in step (1) was replaced with gamma-aminopropyltriethoxysilane.
The coatings prepared in the above examples and comparative examples were sprayed on a sample plate by an electrostatic spray gun, baked in an oven at 200 ℃ for 15 minutes, and then cured and formed, and the cured sample plate was tested for various properties, and the results are shown in table 2:
TABLE 2
| Detecting items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 |
| Gloss (GB/T9757-2007) | 24% | 24% | 24% | 28% | 27% | 24% | 25% | 26% |
| Impact resistance (GB/T1732-1993) | 50Kg·cm | 50Kg·cm | 50Kg·cm | 50Kg·cm | 50Kg·cm | 50Kg·cm | 50Kg·cm | 50Kg·cm |
| Leveling property (GB/T1750-1979) | Stage 8 | Stage 8 | Stage 8 | Stage 8 | Grade 6 | Stage 8 | Stage 7 | Stage 7 |
| Adhesion force of glass substrate after boiling (GB/T9286) | Level 0 | Level 0 | Level 0 | Grade 5 | Level 1 | Level 1 | Level 1 | Level 1 |
| Adhesion force of stainless steel substrate after boiling (GB/T9286) | Level 0 | Level 0 | Level 0 | Grade 5 | Grade 3 | Level 1 | Level 1 | Level 1 |
| Pencil hardness (GB/T6729) | 3H | 3H | 3H | 3H | 3H | 3H | 3H | 3H |
| Weather resistance (GB/T1865) | Class II | Class II | Class II | Class II | Class II | Class II | Class II | Class II |
As can be seen from the data in Table 2, the adhesion of the matting powder coating in examples 1 to 3 of the present invention to the substrate is significantly better than that in comparative examples 1 to 5, and it can be seen that after the low hydroxyl polyurethane resin is modified by using the modified silane coupling agent disclosed in the present invention to obtain the modified resin, the modified resin is used in combination with the low hydroxyl polyurethane resin and the high hydroxyl polyurethane resin as the matrix resin to greatly improve the adhesion of the powder coating to the substrate, and the leveling property of the coating after the powder coating is cured is better.
If the synthetic raw material of the modified silane coupling agent is changed or directly replaced by the common silane coupling agent KH550, the adhesion and leveling property of the obtained powder coating are poor even if the preparation of the extinction powder coating is carried out according to the same formula as the formula of the invention.
If the silane coupling agent or the modified silane coupling agent is directly added into the system, the adhesion force of the powder coating film part area is poor, the coating film adhesion force of the powder coating added with the modified resin does not have any problem, and all the performances are optimal.
The above detailed description of a high adhesion matting powder coating and its preparation with reference to the examples is illustrative and not restrictive, several examples being set forth within the limits of the invention, and therefore variations and modifications may be effected without departing from the general inventive concept within the scope thereof.
Claims (7)
1. The high-adhesion extinction powder coating is characterized by comprising the following raw materials in percentage by weight:
10% of modified polyester;
20-30% of low hydroxyl value polyester resin;
20-30% of high hydroxyl value polyester resin;
20-30% of curing agent;
0.5% of pigment;
10-30% of filler;
0.5-2% of an auxiliary agent;
the preparation method of the modified polyester comprises the following steps: mixing the modified silane coupling agent and the low-hydroxyl polyester resin, performing melt extrusion through a double-screw extruder, tabletting and crushing to obtain the modified silane coupling agent;
the preparation method of the modified silane coupling agent comprises the following steps: mixing gamma-aminopropyltriethoxysilane and gamma- (2, 3-epoxypropoxy) ethoxy diethoxy phosphate, and reacting at 60 ℃ for 2h to obtain the compound;
the low hydroxyl value polyester resin and the high hydroxyl value polyester resin are respectively SJ1100 and SJ 1800.
2. The high-adhesion extinction powder coating is characterized in that the molar ratio of the gamma-aminopropyltriethoxysilane to the gamma- (2, 3-epoxypropoxy) ethoxydiethoxy phosphate is 1: 1-1.2.
3. The high-adhesion matting powder coating according to claim 1 or 2, wherein in the preparation method of the modified polyester, the weight percentages of the modified silane coupling agent and the low-hydroxyl polyester resin are 15% and 85%, respectively.
4. The high-adhesion matt powder coating as claimed in claim 1 or 2, wherein the curing agent is a polyurethane powder coating curing agent B1530.
5. High adhesion matting powder coating according to claim 1 or 2 characterized in that said pigment is carbon black; the filler is aluminum hydroxide.
6. High adhesion matting powder coating according to claim 1 or 2 characterized in that the auxiliaries comprise benzoin degassing agent and levelling agent GLP 588.
7. A process for the preparation of a high adhesion matting powder coating according to any one of claims 1 to 6 comprising the following steps: the high-adhesion extinction powder coating is prepared by mixing the raw materials according to the formula ratio by a mixer, melting and extruding the mixture into sheets by a double-screw extruder, grinding the sheets into powder by a mill, and finally sieving the powder by a 200-mesh sieve.
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