A matte powder coating for perfume display racks, its preparation method and application

Abstract

This invention relates to the field of powder coating technology, and in particular to a matte powder coating for perfume display stands, its preparation method, and its application. The method utilizes hydroxyl polyester resin, isocyanate curing agent, leveling agent, benzoin, hardening wax, defoamer, filler, and pigments as raw materials. The hydroxyl polyester resin and isocyanate curing agent are combined, and high- and low-hydroxyl-value hydroxyl polyester resins are used in a compounding process. This results in a powder coating that, after undergoing a 240-hour perfume resistance test, shows no discoloration, loss of gloss, softening of the coating film, low hardness, or decreased adhesion, demonstrating excellent perfume resistance.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology, and in particular to a matte powder coating for perfume display stands, its preparation method, and its application. Background Technology

[0002] Powder coating is a 100% solid powder that does not contain organic solvents. During coating, it does not use solvents or water as a dispersion medium, but air as the dispersion medium. It can be evenly coated on the surface of the workpiece (perfume display stand), and after heating, it forms a coating layer structure with special functions. It is now widely used in various fields of production and life, such as food, medical devices, and daily necessities.

[0003] Matte powder coatings are a type of powder coating, categorized into indoor and outdoor matte powder coatings based on their application environment. Indoor matte powder coatings are typically prepared by adding the chemical matting agent XG603-1A, while outdoor matte powder coatings are typically prepared by adding the acrylic matting agent T-308. However, tests on these two types of matte powder coatings against Lancôme perfume revealed that they are highly prone to softening, loss of gloss, discoloration, and poor adhesion. Furthermore, the coatings exhibit poor scratch and abrasion resistance, hardness, and mechanical properties.

[0004] Based on this, this researcher, combining practical production and research of powder coatings, and considering the shortcomings of existing matte powder coatings in terms of resistance to Lancôme perfume, conducted research on powder coatings for perfume display racks, providing new ideas for powder coatings for perfume display racks. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems in the prior art, the present invention provides a matte powder coating for perfume display racks, its preparation method and application.

[0006] Specifically, this is achieved through the following technical solutions:

[0007] One of the objectives of this invention is to provide a matte powder coating for perfume display stands. The raw material components, by weight, are 36-50 parts of hydroxyl polyester resin, 20-30 parts of isocyanate curing agent, 1-1.2 parts of leveling agent, 0.3-0.5 parts of benzoin, 0.3-0.5 parts of hardening wax, 0.3-0.5 parts of defoamer, 30-37 parts of filler, and 1.4-1.6 parts of pigment.

[0008] Preferably, the raw material components, by weight, are 36.9 parts of hydroxyl polyester resin, 23 parts of isocyanate curing agent, 1.2 parts of leveling agent, 0.4 parts of benzoin, 0.3 parts of hardening wax, 0.3 parts of defoamer, 36.4 parts of filler, and 1.5 parts of pigment.

[0009] Preferably, the hydroxyl polyester resin is a mixture of high-hydroxyl polyester resin and low-hydroxyl polyester resin in a mass ratio of 27-35:9-15.

[0010] More preferably, the hydroxyl polyester resin is a mixture of high-hydroxyl polyester resin and low-hydroxyl polyester resin in a mass ratio of 27.8:9.1.

[0011] Preferably, the high-hydroxyl polyester resin has a hydroxyl value of 280-320 mgKOH / g, and the low-hydroxyl polyester resin has a hydroxyl value of 35-45 mgKOH / g.

[0012] Preferably, the high-hydroxyl polyester resin has a glass transition temperature ≥60℃, a softening point of 100-120℃, and a viscosity of 320-500 Pa·s at 165℃; and / or the low-hydroxyl polyester resin has a glass transition temperature ≥64℃, a softening point of 115-125℃, and a viscosity of 280-480 Pa·s at 165℃.

[0013] Preferably, the -NCO equivalent in the isocyanate curing agent is 275-285 g / mol.

[0014] Preferably, the leveling agent is an acrylic leveling agent and / or a polyether leveling agent; and / or the defoamer is an amide defoamer; and / or the filler is nepheline with a medium particle size of 4-6 μm.

[0015] The second objective of this invention is to provide a method for preparing the matte powder coating for perfume display stands, comprising the following steps:

[0016] (1) Hydroxy polyester resin, isocyanate curing agent, leveling agent, benzoin, hardening wax, defoamer, filler and pigment are added to a mixer in sequence and mixed to obtain a premix;

[0017] (2) The premixed material is melted and extruded, and then cooled and pulverized to obtain flakes;

[0018] (3) Grind the sheet material through a vertical mill and pass it through a 180-mesh sieve to obtain the final product.

[0019] The third objective of this invention is to provide the application of the above-mentioned matte powder coating for perfume display stands in the coating of perfume display stands.

[0020] Compared with the prior art, the technical effects of this invention are reflected in:

[0021] This invention utilizes hydroxyl polyester resin, isocyanate curing agent, leveling agent, benzoin, hardening wax, defoamer, filler, and pigment as raw materials to achieve synergistic effects between hydroxyl polyester resin and isocyanate curing agent. By compounding hydroxyl polyester resins with high and low hydroxyl values, the resulting powder coating can withstand a 240-hour fragrance resistance test without discoloration, loss of gloss, softening of the coating film, low hardness, or decreased adhesion, demonstrating excellent fragrance resistance.

[0022] The raw materials for this invention are readily available, the production cost is low, and it is easy to industrialize and promote its implementation. Attached Figure Description

[0023] Figure 1 Photographs showing the perfume resistance test results of the powder coating obtained in Example 1 of this invention.

[0024] Figure 2 Photographs showing the perfume resistance test results of the powder coating obtained in Example 2 of this invention.

[0025] Figure 3 Photographs showing the perfume resistance test results of the powder coating obtained in Example 3 of this invention.

[0026] Figure 4 This is a test report on the electrostatic coating of the powder coating obtained in Example 3 of the present invention. Detailed Implementation

[0027] The technical solution of the present invention will be further defined below with reference to specific embodiments, but the scope of protection is not limited to the description made.

[0028] In some embodiments, the method for preparing a perfume display stand using a matte powder coating includes the following steps:

[0029] (1) Hydroxy polyester resin, isocyanate curing agent, leveling agent, benzoin, hardening wax, defoamer, filler and pigment are added to a mixer in sequence and mixed to obtain a premix;

[0030] (2) The premixed material is melted and extruded, and then cooled and pulverized to obtain flakes;

[0031] (3) Grind the sheet material through a vertical mill and pass it through a 180-mesh sieve to obtain the final product.

[0032] In step (1), the raw materials are put into the mixer in sequence and stirred at a stirring speed of 1200r / min for 170-190s, for example: 170s, 180s, 190s, etc., to obtain the premixed material.

[0033] In step (2), the premixed material is fed into a screw extruder, the screw speed is controlled at 45Hz for melt extrusion, and the extrusion temperature is 100-110℃, such as 100℃, 105℃, 110℃, etc., and then cooled and crushed to prepare sheet material.

[0034] In step (3), the sheet material is fed into a vertical mill for grinding, and the main mill speed is controlled at 50 Hz and the auxiliary mill speed is controlled at 38 Hz.

[0035] The powder coating prepared by the above method can be applied using an electrostatic spray gun.

[0036] In addition, this researcher added 0.2% alumina by weight of the powder material during vertical milling to prevent clumping and improve the dispersibility of the powder coating coming out of the vertical mill.

[0037] This invention addresses the shortcomings of traditional powder coatings, such as poor perfume resistance, which shortens the lifespan of perfume display racks, reduces their effectiveness, and even damages them to the point of being unusable. The invention researches powder coatings suitable for perfume display racks.

[0038] In some embodiments, the perfume display rack uses a matte powder coating, the raw material composition by weight being 36-50 parts of hydroxyl polyester resin, 20-30 parts of isocyanate curing agent, 1-1.2 parts of leveling agent, 0.3-0.5 parts of benzoin, 0.3-0.5 parts of hardening wax, 0.3-0.5 parts of defoamer, 30-37 parts of filler, and 1.4-1.6 parts of pigment. For example: 36 parts of hydroxyl polyester resin, 20 parts of isocyanate curing agent, 1 part of leveling agent, 0.3 parts of benzoin, 0.3 parts of hardening wax, 0.3 parts of defoamer, 30 parts of filler, and 1.4 parts of pigment; another example: 50 parts of hydroxyl polyester resin, 30 parts of isocyanate curing agent, 1.2 parts of leveling agent, 0.5 parts of benzoin, 0.5 parts of hardening wax, 0.5 parts of defoamer, 37 parts of filler, and 1.6 parts of pigment; yet another example: 36 parts of hydroxyl polyester resin, 20 parts of isocyanate curing agent, 1 part of leveling agent, 0.5 parts of benzoin, 0.5 parts of hardening wax, 0.5 parts of defoamer, 37 parts of filler, and 1.6 parts of pigment. For example: 30 parts of chemical agent, 1 part of leveling agent, 0.5 parts of benzoin, 0.3 parts of hardening wax, 0.5 parts of defoamer, 30 parts of filler, and 1.6 parts of pigment; Another example: 50 parts of hydroxyl polyester resin, 20 parts of isocyanate curing agent, 1.2 parts of leveling agent, 0.3 parts of benzoin, 0.5 parts of hardening wax, 0.3 parts of defoamer, 37 parts of filler, and 1.4 parts of pigment; Yet another example: 36 parts of hydroxyl polyester resin, 20 parts of isocyanate curing agent, 1.2 parts of leveling agent, and 0.5 parts of benzoin. 5 parts, hardening wax 0.3 parts, defoamer 0.3 parts, filler 37 parts, pigment 1.6 parts; For example: 50 parts hydroxyl polyester resin, 30 parts isocyanate curing agent, 1 part leveling agent, 0.3 parts benzoin, 0.5 parts hardening wax, 0.5 parts defoamer, filler 30 parts, pigment 1.4 parts; For example: 50 parts hydroxyl polyester resin, 30 parts isocyanate curing agent, 1.2 parts leveling agent, 0.3 parts benzoin, 0.3 parts hardening wax, defoamer 0.3 parts For example: 30 parts filler, 1.6 parts pigment; or 36 parts hydroxyl polyester resin, 20 parts isocyanate curing agent, 1 part leveling agent, 0.3 parts benzoin, 0.5 parts hardening wax, 0.5 parts defoamer, 37 parts filler, 1.6 parts pigment; or 36.9 parts hydroxyl polyester resin, 23 parts isocyanate curing agent, 1.2 parts leveling agent, 0.4 parts benzoin, 0.3 parts hardening wax, 0.3 parts defoamer, 36.4 parts filler, 1.5 parts pigment, etc.

[0039] In some embodiments, the hydroxyl polyester resin is a mixture of high-hydroxyl polyester resin and low-hydroxyl polyester resin in a mass ratio of 27-35:9-15, for example: 3:1, 9:5, 27.8:9.1, 28:9, 28:9.5, 28:10, 28:11, 28:12.1, 28:13, 28:14, 28:15, 29:11, 29:13, 29:15, 30:9.1, 30:11, 30:12, 30:13, 2:1, 33:10, 33:13, 33:15, 35:9.7, 35:11, 35:12, 35:12.5, 35:13, 35:13.7, 35:14.3, 35:14.8, 7:3, etc.

[0040] In some embodiments, the hydroxyl value of the high-hydroxyl polyester resin is 280-320 mgKOH / g, for example: 280 mgKOH / g, 290 mgKOH / g, 300 mgKOH / g, 310 mgKOH / g, 320 mgKOH / g, etc., and the hydroxyl value of the low-hydroxyl polyester resin is 35-45 mgKOH / g, for example: 35 mgKOH / g, 36 mgKOH / g, 37 mgKOH / g, 38 mgKOH / g, 39 mgKOH / g, 40 mgKOH / g, 41 mgKOH / g, 42 mgKOH / g, 43 mgKOH / g, 44 mgKOH / g, 45 mgKOH / g, etc.

[0041] In some embodiments, the high-hydroxyl polyester resin has a glass transition temperature ≥60°C and a softening point of 100-120°C, for example, 100°C, 110°C, 120°C, etc., and a viscosity of 320-500 Pa·s at a temperature of 165°C, for example, 320 Pa·s, 380 Pa·s, 410 Pa·s, 440 Pa·s, 470 Pa·s, 500 Pa·s, etc.; and / or the low-hydroxyl polyester resin has a glass transition temperature ≥64°C and a softening point of 115-125°C, for example, 115°C, 120°C, 125°C, etc., and a viscosity of 280-480 Pa·s at a temperature of 165°C, for example, 280 Pa·s, 300 Pa·s, 340 Pa·s, 370 Pa·s, 400 Pa·s, 430 Pa·s, 450 Pa·s, 480 Pa·s, etc.

[0042] In some embodiments, the -NCO equivalent in the isocyanate curing agent is 275-285 g / mol, for example: 275 g / mol, 280 g / mol, 285 g / mol, etc.

[0043] In some embodiments, the leveling agent is an acrylic leveling agent and / or a polyether leveling agent; and / or the defoamer is an amide defoamer; and / or the filler is nepheline with a medium particle size of 4-6 μm.

[0044] In order to better verify the technical effects that this invention can bring, the researchers conducted the following experimental studies.

[0045] Example 1

[0046] The raw material composition is 50.5 kg of phenolic epoxy resin, 14.5 kg of phenolic curing agent, 1.2 kg of polyether leveling agent (TF-620), 0.3 kg of benzoin, 0.3 kg of amide defoamer (TP-39), 0.3 kg of hardening wax (HD-520), 5 kg of matting agent (XG603-1A), 26.4 kg of nepheline particles with a medium particle size between 4-6 μm as filler, and 1.5 kg of pigment. The phenolic epoxy resin used has a glass transition temperature ≥55℃, a softening point of 110℃, an epoxy equivalent of 800 g / mol, and a viscosity of 200 Pa·s at 165℃. The phenolic curing agent used is linear bisphenol A phenolic resin with a hydroxyl equivalent of 245 g / mol.

[0047] During preparation, the raw materials are put into a mixer and stirred at a stirring speed of 1200r / min for 180s. Then, they are fed into a screw extruder and extruded at a temperature between 90-100℃. After cooling, they are crushed and then fed into a vertical mill for grinding. After passing through a 180-mesh sieve, the product is obtained.

[0048] Example 2

[0049] The raw material composition is 48.6 kg of carboxylated polyester resin, 19 kg of acrylic matte resin, 1 kg of leveling agent, 0.3 kg of benzoin, 0.3 kg of hardening wax, 0.3 kg of defoamer, 29 kg of filler, and 1.5 kg of pigment. The carboxylated polyester resin used has a glass transition temperature of 65℃, a softening point of 110℃, an acid value of 34 mg KOH / g, and a viscosity of 342 Pa·s at 165℃. The acrylic matte resin has an epoxy equivalent of 700 g / mol, and all other components are the same as in Example 1.

[0050] Example 3

[0051] The raw material composition is 27.8 kg of high-hydroxyl polyester resin, 9.1 kg of low-hydroxyl polyester resin, 23 kg of isocyanate curing agent, 1.2 kg of leveling agent, 0.4 kg of benzoin, 0.3 kg of hardening wax, 0.3 kg of defoamer, 36.4 kg of filler, and 1.5 kg of pigment. The high-hydroxyl polyester resin used has a glass transition temperature ≥60℃, a softening point of 110℃, a hydroxyl value of 320 mg / KOH / g, and a viscosity of 320 Pa·s at 165℃. The low-hydroxyl polyester resin has a glass transition temperature ≥64℃, a softening point of 115℃, a hydroxyl value of 35 mg / KOH / g, and a viscosity of 400 Pa·s at 165℃. The isocyanate curing agent is a blocked isocyanate curing agent with an -NCO equivalent of 275 g / mol. All other components are the same as in Example 1.

[0052] Example 4

[0053] The raw material composition is 27 kg of high-hydroxyl polyester resin, 15 kg of low-hydroxyl polyester resin, 20 kg of isocyanate curing agent, 1 kg of leveling agent, 0.3 kg of benzoin, 0.5 kg of hardening wax, 0.3 kg of defoamer, 30 kg of filler, and 1.4 kg of pigment. The high-hydroxyl polyester resin used has a glass transition temperature ≥60℃, a softening point of 120℃, a hydroxyl value of 280 mg / KOH / g, and a viscosity of 500 Pa·s at 165℃. The low-hydroxyl polyester resin has a glass transition temperature ≥64℃, a softening point of 125℃, a hydroxyl value of 45 mg / KOH / g, and a viscosity of 480 Pa·s at 165℃. The isocyanate curing agent is a blocked isocyanate curing agent with an -NCO equivalent of 285 g / mol. All other components are the same as in Example 1.

[0054] Example 5

[0055] The raw material composition is 35 kg of high-hydroxyl polyester resin, 9 kg of low-hydroxyl polyester resin, 30 kg of isocyanate curing agent, 1.1 kg of leveling agent, 0.4 kg of benzoin, 0.4 kg of hardening wax, 0.4 kg of defoamer, 35 kg of filler, and 1.6 kg of pigment. The high-hydroxyl polyester resin used has a glass transition temperature ≥60℃, a softening point of 120℃, a hydroxyl value of 280 mg / KOH / g, and a viscosity of 500 Pa·s at 165℃. The low-hydroxyl polyester resin has a glass transition temperature ≥64℃, a softening point of 125℃, a hydroxyl value of 45 mg / KOH / g, and a viscosity of 480 Pa·s at 165℃. The isocyanate curing agent is a blocked isocyanate curing agent with an -NCO equivalent of 285 g / mol. The leveling agent is acrylic resin, and all other components are the same as in Example 1.

[0056] The powder coatings for perfume display racks prepared in Examples 1-5 were sprayed with an electrostatic gun and then cured at 200°C for 10 minutes. The thickness of the sprayed film was between 60-80 μm. The performance of the sprayed film was tested, and the results are shown in Table 1 below.

[0057] Table 1 Coating performance test

[0058] Example 1 Example 2 Example 3 Example 4 Example 5 Gloss (60°) between / % 6.0±1 6.0±1 6.0±1 6.0±1 6.0±1 Adhesion (100-cross test) / grade 0 0 0 0 0 Impact resistance test (QCJ impact tester) / kg·cm 50 20 50 50 50

[0059] The powder coatings prepared in Examples 1-3 were applied to form a film, and then treated with Lancôme perfume for 240 hours. Changes in the coating layer were observed, and the results are shown in Table 2 and... Figure 1 , Figure 2 and Figure 3 As shown.

[0060] Table 2 Lancôme Fragrance 240h Test

[0061] Lancôme perfume 240h test results Example 1 The perfume is absorbed by the coating, softening the coating, resulting in poor adhesion and slight discoloration. Example 2 The perfume is absorbed by the coating, causing the coating to soften, resulting in poor adhesion and severe discoloration. Example 3 The perfume was not absorbed by the coating, and the coating showed no corrosion, softening, or discoloration, exhibiting good adhesion.

[0062] As shown in Tables 1 and 2, the gloss (60°) is between 5-7%, and the impact resistance is 50 kg·cm when tested with a QCJ impact tester. After 240 hours of perfume resistance testing, no discoloration, loss of gloss, softening of the coating, low hardness, or decrease in adhesion was observed. It has excellent perfume resistance and is suitable for use in perfume display rack coating applications. Furthermore, it can maintain good mechanical properties and scratch resistance even at lower gloss levels.

[0063] In addition, the researchers tested the powder coating obtained in Example 3 by electrostatic spraying it onto a 0.5mm thick aluminum panel, examining its color, gloss, thickness, impact strength, pencil hardness, adhesion (cross-cut test), and bending test. The results are as follows: Figure 4 As shown.

[0064] For any other matters not covered in this invention, reference can be made to existing technology or common knowledge known to those skilled in the art, and conventional technical means can be used to implement them.

[0065] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A matte powder coating for a perfume display stand, characterized in that, The raw material composition by weight is 36.9 parts hydroxyl polyester resin, 23 parts blocked isocyanate curing agent, 1.2 parts leveling agent, 0.4 parts benzoin, 0.3 parts hardening wax, 0.3 parts amide defoamer, 36.4 parts nepheline filler with a medium particle size of 4-6 μm, and 1.5 parts pigment; The hydroxyl polyester resin is a mixture of high-hydroxyl polyester resin and low-hydroxyl polyester resin in a mass ratio of 27-35:9-15; the high-hydroxyl polyester resin has a hydroxyl value of 320 mg KOH / g, a glass transition temperature ≥60℃, a softening point of 110℃, and a viscosity of 320 Pa·s at 165℃. The low-hydroxyl polyester resin has a hydroxyl value of 35 mg KOH / g, a glass transition temperature ≥ 64℃, a softening point of 115℃, and a viscosity of 400 Pa·s at 165℃. The -NCO equivalent in the blocked isocyanate curing agent is 275 g / mol; The preparation method includes the following steps: (1) Hydroxy polyester resin, isocyanate curing agent, leveling agent, benzoin, hardening wax, defoamer, filler and pigment are added into a mixer in sequence and stirred at a stirring speed of 1200r / min for 170-190s to obtain a premix; (2) The premixed material is melt-extruded at a temperature of 100-110℃, and then cooled and pulverized to obtain flakes; (3) Grind the sheet material through a vertical mill and pass it through an 180-mesh sieve to obtain the final product.

2. The matte powder coating for perfume display stands as described in claim 1, characterized in that, The hydroxyl polyester resin is a mixture of high-hydroxyl polyester resin and low-hydroxyl polyester resin in a mass ratio of 27.8:9.

1.

3. The matte powder coating for perfume display stands as described in claim 1, characterized in that, The leveling agent is an acrylic leveling agent.

4. The coating as described in any one of claims 1-3 is used in the coating of perfume display racks.

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