Scratch-resistant matte clear topcoat and preparation method and use method thereof

Abstract

The present invention provides a scratch-resistant matte clear topcoat and its preparation method and use method. The raw materials for preparing the matte clear topcoat include a main resin, p-toluenesulfonic acid, a matting powder, and a Jiashengda SFP-22 wear-resistant feel agent; wherein the main resin includes at least one of an alkyd resin, an amino resin, and an epoxy resin. In the prior art, based on the "acid curing" formula used in the present invention, the use of other additives that increase wear resistance or feel makes it difficult for the matte clear topcoat to achieve rapid drying. The inventors unexpectedly discovered that the Jiashengda SFP-22 wear-resistant feel agent, which is generally used in polyurethane coatings, can be used in this solution. In addition to enhancing the scratch resistance of the matte clear topcoat, it also does not affect the curing speed of the matte clear topcoat.

Description

Technical Field

[0001] The invention belongs to the field of coatings, and in particular relates to a scratch-resistant matte clear topcoat and a preparation method and a use method thereof. Background Art

[0002] Among the existing technologies, although the surface of matte clear topcoat is relatively rough, its durability and scratch resistance are relatively poor. Moreover, due to its rough surface, rainwater, dust, grease and other substances are more easily adsorbed on its surface, causing matte clear topcoat to be more prone to yellowing, graying and even warping compared to other clear topcoats. In addition, due to the poor scratch resistance of matte clear topcoat, when it is necessary to clean or maintain the surface object with matte clear topcoat, it is necessary to use a soft cloth or use a special maintenance agent for matte clear topcoat, otherwise it may cause irreparable damage. Therefore, although matte clear topcoat can bring special aesthetic effects, due to its non-scratch resistance and short lifespan, its price is relatively high, which greatly affects its target audience. Summary of the Invention

[0003] In order to enhance the scratch resistance and durability of matte clear topcoat, the present invention provides a scratch-resistant matte clear topcoat and a preparation method and a use method thereof.

[0004] According to one aspect of the present invention, a scratch-resistant matte clear topcoat is provided, and the raw materials for preparing the matte clear topcoat include a main resin, p-toluenesulfonic acid, a matting powder and a Jiashengda SFP-22 wear-resistant feel agent; wherein the main resin includes at least one of an alkyd resin, an amino resin and an epoxy resin.

[0005] The matte clear topcoat provided by the present invention utilizes the special “acid curing” reaction between p-toluenesulfonic acid and amino resin and alkyd resin, which can not only adjust the flexibility of the paint film, but also utilize the remaining energy of the reaction between p-toluenesulfonic acid and amino resin to promote the film formation of alkyd resin, and utilize epoxy resin to enhance the adhesion and durability of the matte clear topcoat. In addition, in the prior art, based on the “acid curing” formula used in the present invention, the use of other additives that increase wear resistance or feel will make it difficult for the matte clear topcoat to dry quickly. The inventor unexpectedly discovered that the Jiashengda SFP-22 wear-resistant feel agent generally used in polyurethane coatings can be used in this solution. In addition to enhancing the scratch resistance of the matte clear topcoat, it also does not affect the curing speed of the matte clear topcoat. Therefore, the matte clear topcoat provided by the present invention has good scratch resistance, durability, and a fast-drying curing speed.

[0006] Preferably, in the matte clear topcoat, the mass percentage of the Jiashengda SFP-22 wear-resistant feel agent to the total mass of the Jiashengda SFP-22 wear-resistant feel agent, the main resin and the matting powder is not less than 0.1%.

[0007] Preferably, the main resin includes alkyd resin, amino resin and epoxy resin in the following ratio calculated by mass: alkyd resin: amino resin: epoxy resin = 28-35: 28-36: 1-5.

[0008] Preferably, the raw materials for preparing the matte clear topcoat further include a viscosity modifier, and the viscosity modifier includes at least one of butyl acetate, n-butanol, and ethyl acetate.

[0009] Preferably, the viscosity regulator includes butyl acetate, n-butanol and ethyl acetate, and the mass ratio is butyl acetate: n-butanol: ethyl acetate = 6-12: 4-8: 5-12.

[0010] Preferably, the alkyd resin includes AN623 / XE alkyd resin from DSM Chemicals of Italy.

[0011] Preferably, the epoxy resin includes Nan Ya 901X-75.

[0012] Preferably, the amino resin includes Changchun Chemical 5220-65D amino resin.

[0013] Preferably, the p-toluenesulfonic acid (PTSA) content is 99%.

[0014] Preferably, the raw materials for preparing the matte clear topcoat further include a dispersant, and the dispersant includes a polyurethane dispersant.

[0015] Preferably, the dispersant comprises AFCONA4010 modified polyurethane polymer.

[0016] Preferably, the raw materials for preparing the matte clear topcoat further include an anti-settling agent, and the anti-settling agent includes a polyamide wax anti-settling agent.

[0017] Preferably, the anti-settling agent comprises Disbaron 6900-20 polyamide wax.

[0018] Preferably, the raw materials for preparing the matte clear topcoat also include a leveling agent, and the leveling agent includes Tego 450 leveling agent.

[0019] Preferably, the raw materials for preparing the matte clear topcoat further include a defoamer, and the defoamer includes BYK8800 silicone-free foam-breaking polymer solution.

[0020] Preferably, calculated by mass ratio, amino resin: p-toluenesulfonic acid = 15-18:1.

[0021] According to a second aspect of the present invention, a method for preparing a matte clear topcoat is provided, comprising the following steps: preparing a first component by sequentially mixing an alkyd resin, a matting agent, and a Jiashengda SFP-22 wear-resistant feel agent to obtain an intermediate reaction liquid; subsequently, sequentially adding an amino resin and an epoxy resin to the intermediate reaction liquid to obtain a first component; and preparing a second component by mixing p-toluenesulfonic acid with a solvent to obtain a second component. The first and second components are mixed during application.

[0022] Preferably, during construction, the mass ratio of the first component to the second component is 10:1.

[0023] Preferably, in step 1, alkyd resin, dispersant, matting agent, anti-settling agent, defoaming agent, leveling agent and Jiashengda SFP-22 wear-resistant feel agent are added in sequence.

[0024] Preferably, in step 1, the fineness of the first reaction liquid is less than 30 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is Jiashengda SFP-22 wear-resistant feel agent. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] Example 1

[0028] 1. Preparation of matte clear topcoat materials

[0029] This embodiment provides a matte clear topcoat. The raw materials and proportions required for preparing the matte clear topcoat are shown in Table 1. The additives used in this embodiment for preparing the matte clear topcoat include the dispersant, matting powder, anti-settling agent, defoaming agent, and leveling agent mentioned in Table 1.

[0030] Table 1. Raw materials required for each step of preparing matte clear topcoat in this embodiment

[0031]

[0032]

[0033] 2. Method for preparing matte clear topcoat

[0034] Preparation of the first component: Alkyd resin and butyl acetate are mixed in sequence, followed by addition of matting agent and Jiashengda SFP-22 wear-resistant feel agent to obtain an intermediate reaction solution. Then, n-butanol, amino resin, epoxy resin, and ethyl acetate are added to the intermediate reaction solution to obtain the first component. Preparation of the second component: p-Toluenesulfonic acid is mixed with a solvent to obtain the second component. The first and second components are mixed during construction.

[0035] During construction, the mass ratio is calculated as follows: first component: second component = 10:1.

[0036] Example 2

[0037] The raw materials and proportions required for preparing the matte clear topcoat in this embodiment are shown in Table 2. The additives used in preparing the matte clear topcoat in this embodiment include the dispersant, matting powder, anti-settling agent, defoaming agent, and leveling agent mentioned in Table 2. The required raw materials were prepared in the amounts described in Table 2, and the matte clear topcoat was prepared by referring to the steps for preparing the matte clear topcoat provided in Example 1. Compared to Example 1, this embodiment differs from Example 1 in terms of the aforementioned formula composition, and the operating steps for preparing the matte clear topcoat are strictly consistent with those of Example 1.

[0038] Table 2. Raw materials required for each step of preparing matte clear topcoat in this embodiment

[0039]

[0040]

[0041] Example 3

[0042] The raw materials and proportions required for preparing the matte clear topcoat in this embodiment are shown in Table 3. The additives used in preparing the matte clear topcoat in this embodiment include the dispersant, matting powder, anti-settling agent, defoaming agent, and leveling agent mentioned in Table 3. The required raw materials were prepared in the amounts described in Table 3, and the matte clear topcoat was prepared by referring to the steps for preparing the matte clear topcoat provided in Example 1. Compared to Example 1, this embodiment differs from Example 1 in terms of the aforementioned formula composition, and the operating steps for preparing the matte clear topcoat are strictly consistent with those of Example 1.

[0043] Table 3. Raw materials required for each step of preparing matte clear topcoat in this embodiment

[0044]

[0045] Example 4

[0046] This example prepares a matte clear topcoat with reference to the formula and method provided in Example 2. Compared with Example 2, this example uses equal parts by mass of dispersants to replace anti-settling agents and leveling agents when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat in this example are strictly consistent with those in Example 2.

[0047] Example 5

[0048] This example prepares a matte clear topcoat with reference to the formula and method provided in Example 2. Compared with Example 2, this example uses an anti-settling agent in equal parts by mass to replace the dispersant and leveling agent when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat in this example are strictly consistent with those in Example 2.

[0049] Example 6

[0050] This example prepares a matte clear topcoat with reference to the formula and method provided in Example 2. Compared with Example 2, this example uses equal parts by mass of a leveling agent instead of a dispersant and an anti-settling agent when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat in this example are strictly consistent with those in Example 2.

[0051] Comparative Example 1

[0052] In this comparative example, matte clear topcoat is prepared by referring to the formula and method provided in Example 2. Compared with Example 2, this comparative example uses an equal mass portion of Changchun Chemical 5220-65D amino resin instead of AN623 / XE alkyd resin when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat are strictly consistent with Example 2.

[0053] Comparative Example 2

[0054] This comparative example prepares matte clear topcoat by referring to the formula and method provided in Example 2. Compared with Example 2, this comparative example uses equal parts by mass of AN623 / XE alkyd resin instead of Changchun Chemical 5220-65D amino resin when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat are strictly consistent with Example 2.

[0055] Comparative Example 3

[0056] This comparative example prepares a matte clear topcoat by referring to the formula and method provided in Example 2. Compared with Example 2, this comparative example replaces the epoxy resin in equal parts by mass with butyl acetate: n-butanol: ethyl acetate = 7:3:3.4 when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat are strictly consistent with Example 2.

[0057] Comparative Example 4

[0058] In this comparative example, a matte clear topcoat was prepared by referring to the formula and method provided in Example 2. Compared with Example 2, this comparative example used an equal mass portion of isophorone diisocyanate instead of p-toluenesulfonic acid in the second component. Except for the above differences, the operating steps for preparing the matte clear topcoat were strictly consistent with those in Example 2.

[0059] Comparative Example 5

[0060] This comparative example prepares matte clear topcoat by referring to the formula and method provided in Example 2. Compared with Example 2, this comparative example uses an equal mass portion of aqueous wax emulsion to replace Jiashengda SFP-22 wear-resistant feel agent when preparing the matte clear topcoat. Except for the above differences, the operating steps for preparing the matte clear topcoat are strictly consistent with Example 2.

[0061] Test Example 1

[0062] 1. Test subjects

[0063] Matt clear topcoat prepared in Examples 1 to 3 and Comparative Examples 1 to 5.

[0064] 2. Test Method

[0065] Tested according to Q / MTS 025-2022, the enterprise standard for solvent-based acid-curing (AC) wood coatings.

[0066] Among them, the adhesion of the paint film is tested using the grid spacing method; the flexibility is tested using the tinplate method; the scratch resistance, that is, the surface scratch resistance, is tested on the coating surface using the five-finger scratching method; the gloss test is carried out at a measuring angle of 60°, and the durability test of the paint film includes dry heat resistance and water resistance. Among them, the dry heat resistance is carried out at 90°C for 15 minutes, and the water resistance is the condition of the paint film after 24 hours in water.

[0067] 3. Test results and analysis

[0068] The test results of this test example are shown in Tables 5 and 6. This test example primarily explored the effects of formulation changes in matte clearcoat on its performance. While the performance of the matte clearcoat in Examples 1-3 fluctuated, it remained at a good level. In contrast, the performance of the matte clearcoat in Examples 4-6 was slightly inferior to that of Examples 1-3, demonstrating that the dispersant, anti-settling agent, and leveling agent act synergistically, enhancing the scratch resistance and durability of the matte clearcoat.

[0069] Among Examples 1-3, the matte clear topcoat prepared in Example 2 exhibited the best performance. Comparative Example 1 omitted the use of an alkyd resin to prepare the matte clear topcoat, resulting in a decrease in flexibility. Comparative Example 2 omitted the use of an amino resin to prepare the matte clear topcoat, resulting in a slower drying rate. In Comparative Example 3, the use of a solvent in place of an epoxy resin significantly reduced the matte clear topcoat's adhesion, dry heat resistance, water resistance, and scratch resistance. In Comparative Example 4, the omission of p-toluenesulfonic acid from component B, despite the addition of the curing agent isophorone diisocyanate, resulted in a significant decrease in the matte clear topcoat's drying rate. In Comparative Example 5, the use of a conventional wear-resistant additive in place of the Jiashengda SFP-22 wear-resistant feel agent resulted in a slower drying rate and the formation of lumps during stirring.

[0070] Table 5. Test results of test examples 1 to 6

[0071]

[0072] Table 6. Test results of Comparative Examples 1 to 6 in Test Example 1

[0073] Test items Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 luster / % 40 35 30 38 42 Drying (50℃) / h 3h 6h 2h 7h 5h Pencil hardness 2B HB HB HB HB flexibility Φ4 Φ3 Φ3 Φ3 Φ3 Adhesion Level 1 Level 2 Level 4 Level 2 Level 2 Dry heat resistance Level 1 Level 1 Level 2 Level 1 Level 1 Water resistance No abnormalities No abnormalities 24h shedding No abnormalities No abnormalities Scratch resistance No obvious scratches No obvious scratches Obvious scratches No obvious scratches Obvious scratches

[0074] Example 7

[0075] This example uses the formula and method provided in Example 2 to prepare a matte clear topcoat. Unlike Example 2, this example uses a one-pot method to prepare the matte clear topcoat. Other than the aforementioned differences, the formula for preparing the matte clear topcoat in this example is strictly consistent with that in Example 2. Specifically, the steps for preparing the matte clear topcoat in this example are as follows:

[0076] Alkyd resin, butyl acetate, dispersant, talc, polyamide wax anti-settling agent, defoamer, n-butanol, amino resin, epoxy resin, ethanol, ethyl acetate, toluene and p-toluenesulfonic acid are mixed and put into a dispersion tank. The mixture is dispersed in a disperser at a temperature of 30° C. for 23 minutes at a dispersion speed of 90 rpm to obtain a matte clear topcoat.

[0077] Example 8

[0078] This example prepares a matte clear topcoat using the formula and method provided in Example 2. Unlike Example 2, this example adds the additives first and then the alkyd resin. Aside from these differences, the formula for preparing the matte clear topcoat in this example remains strictly consistent with that in Example 2. Specifically, the steps for preparing the first component of the matte clear topcoat in this example are as follows:

[0079] Preparation of the first component: Mix matting powder and Jiashengda SFP-22 wear-resistant feel agent in sequence, then add alkyd resin to the mixture to obtain an intermediate reaction solution. Then, add amino resin and epoxy resin to the intermediate reaction solution to obtain the first component. Preparation of the second component: Mix p-toluenesulfonic acid and solvent to obtain the second component. Mix the first and second components during construction.

[0080] Test Example 2

[0081] 1. Test subjects

[0082] Matt clear topcoat prepared in Example 2 and Examples 7 and 8.

[0083] 2. Test Method

[0084] Follow the test method of Test Example 1.

[0085] 3. Test results and analysis

[0086] The test results of this test example are shown in Table 7. This test example mainly explores the impact of changes in the preparation method on the performance of the matte clear topcoat. In Examples 7 and 8, it can be found that due to the changes in the operating steps of the preparation method, the performance of the matte clear topcoat prepared in Examples 7 and 8 has decreased to varying degrees compared to that of Example 2. In Example 7, due to the use of a one-step method to prepare the matte clear topcoat, p-toluenesulfonic acid and amino resin reacted prematurely, forming coarse particles with the matting powder during the dispersion process, resulting in reduced adhesion, flexibility, and scratch resistance. In Example 8, adding the matting powder and Jiashengda SFP-22 wear-resistant feel agent first and then adding the alkyd resin for dispersion resulted in uneven dispersion, which in turn led to a decrease in the overall performance of the matte clear topcoat. Therefore, this test example illustrates that the order in which the additives are added can affect the performance of the matte clear topcoat.

[0087] Table 9. Test results of test case 3

[0088] Test items Example 2 Example 8 Example 9 luster / % 33 35 39 Dry (50℃) / 2h 4h 4h Pencil hardness HB 2B 2B flexibility Φ2 Φ4 Φ3 Adhesion Level 1 Level 3 Level 2 Dry heat resistance Level 1 Level 2 Level 1 Water resistance No abnormalities No abnormalities No abnormalities Scratch resistance No obvious scratches Obvious scratches Shallow scratches

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A scratch-resistant matte clear topcoat, characterized in that: The raw materials for preparing the matte clear topcoat include main resin, p-toluenesulfonic acid, matting powder and Jiashengda SFP-22 wear-resistant feel agent; wherein the main resin includes alkyd resin, amino resin and epoxy resin; Calculated by mass ratio, the alkyd resin, the amino resin, and the epoxy resin included in the main resin satisfy the following ratio: the alkyd resin: the amino resin: the epoxy resin = 28-35: 28-36: 1-5.

2. The matte clear topcoat according to claim 1, wherein: The mass of the Jiashengda SFP-22 wear-resistant feel agent accounts for no less than 0.1% of the total mass of the Jiashengda SFP-22 wear-resistant feel agent, the main resin and the matting powder.

3. The matte clear topcoat according to claim 1, wherein: The raw materials for preparing the matte clear topcoat further include a viscosity modifier, and the viscosity modifier includes at least one of butyl acetate, n-butanol, and ethyl acetate.

4. The matte clear topcoat according to claim 3, wherein: The viscosity modifier includes butyl acetate, n-butanol and ethyl acetate. Calculated by mass ratio, the butyl acetate: the n-butanol: the ethyl acetate = 6-12: 4-8: 5-12.

5. The matte clear topcoat according to claim 3, characterized in that: The raw materials for preparing the matte clear topcoat also include a dispersant, and the dispersant includes a polyurethane dispersant.

6. The matte clear topcoat according to claim 3, characterized in that: The raw materials for preparing the matte clear topcoat also include an anti-settling agent, and the anti-settling agent includes a polyamide wax anti-settling agent.

7. The matte clear topcoat according to claim 3, characterized in that: The raw materials for preparing the matte clear topcoat also include a leveling agent, and the leveling agent includes Tego 450 leveling agent.

8. The matte clear topcoat according to any one of claims 1 to 7, characterized in that: Calculated by mass ratio, the amino resin: the p-toluenesulfonic acid = 15-18:

1.

9. A method for preparing the matte clear topcoat according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Preparation of the first component: sequentially mixing the alkyd resin, the matting powder, and the Jiashengda SFP-22 wear-resistant feel agent to obtain an intermediate reaction liquid; then sequentially adding the amino resin and the epoxy resin to the intermediate reaction liquid to obtain the first component; Preparation of the second component: the p-toluenesulfonic acid is mixed with a solvent to prepare the second component.

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