A matte skin finish and method of use

Abstract

The present application relates to the technical field of paint, especially to the field of IPC C09D4, further, it relates to a kind of matte skin finish and preparation method thereof.By mass fraction, raw materials include: excimer resin 60~110 parts, monomer 10~30 parts, photoinitiator 0.1~2 parts, leveling agent 0.1~1 part;The finish prepared by the present application can achieve good extinction effect and skin feeling without adding extinction powder, and simultaneously has excellent hardness and yellowing resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to the field of IPC C09D4, and further relates to a matte skin finish paint and a preparation method thereof. BACKGROUND

[0002] With the continuous improvement of modern people's requirements for comfortable home environment, high hardness, yellowing resistance and good skin feel of furniture are pursued by consumers. However, the existing UV finish paint has the problems of difficult extinction and uneven gloss after adding extinction powder; therefore, it is of great significance to prepare a high hardness and yellowing resistant matte skin finish paint suitable for the development of the times.

[0003] A UV matte finish paint is disclosed in Chinese patent CN 201711356562, and the components thereof include, in terms of weight parts: epoxy / modified epoxy acrylate 30-40 parts, monomer 30-40 parts, extinction powder 10-15 parts, photoinitiator 3-5 parts, defoaming agent 0.1-0.2 parts, wetting agent 0.1-0.3 parts, leveling agent 0.2-0.5 parts, and dispersing agent 0.5-1 part. However, the extinction powder is added in the technical solution, which solves the problem of unstable gloss of the paint film, but the hardness of the paint film needs to be improved.

[0004] At present, the coating cured by 172nm excimer lamp is only a very thin layer on the surface, which will shrink to form a dull surface and float in the uncured lower layer of liquid, so as to achieve the effect of matte surface, thereby avoiding the use of extinction powder; however, the matte effect and skin feel of the finish paint need to be improved due to the inconsistent shrinkage ratio of different resins. SUMMARY

[0005] The present application provides a matte skin finish paint, and the raw materials thereof include, in terms of mass parts: excimer resin 60-110 parts, monomer 10-30 parts, photoinitiator 0.1-2 parts, and leveling agent 0.1-1 part.

[0006] Preferably, the matte skin finish paint includes, in terms of mass parts: excimer resin 70-100 parts, monomer 15-25 parts, photoinitiator 0.2-1 part, and leveling agent 0.5-1 part.

[0007] Preferably, the excimer resin is selected from one or a combination of polyurethane acrylate, epoxy acrylate and polyester acrylate.

[0008] Preferably, the excimer resin is polyurethane acrylate.

[0009] Preferably, the polyurethane acrylate is selected from one or a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate.

[0010] Preferably, the polyurethane acrylate is a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate.

[0011] Preferably, the aliphatic polyurethane acrylate has a functionality of ≥6.

[0012] Preferably, the aliphatic polyurethane acrylate has a functionality of 10.

[0013] Preferably, the viscosity of the 10-functionality aliphatic polyurethane acrylate is 75,000 to 95,000 cps (25°C).

[0014] Preferably, the functionality of the aromatic polyurethane acrylate is ≤4.

[0015] Preferably, the functionality of the aromatic polyurethane acrylate is 2.

[0016] Preferably, the mass ratio of the aliphatic polyurethane acrylate to the aromatic polyurethane acrylate is (10-20):(60-80).

[0017] When curing topcoat with a 172nm excimer lamp, due to the limited penetration depth of only 100-500nm, only a very thin layer of the topcoat is cured. This results in an uneven surface due to shrinkage, floating on the uncured underlying layer and creating a matte or skin-like effect. However, because different resins have varying shrinkage ratios, different shrinkage gradients and wrinkles are formed, leading to variations in the matte finish and skin-like feel of the topcoat. The applicant has discovered that when the excimer resin is a polyurethane acrylate, specifically a combination of aliphatic and aromatic polyurethane acrylates, the resulting topcoat exhibits excellent matte finish and skin-like feel. Furthermore, the applicant discovered that higher functionality of polyurethane acrylates is not always better. When the functionality of aliphatic polyurethane acrylates is ≥6 and that of aromatic polyurethane acrylates is ≤4, especially when the functionality of the aliphatic polyurethane acrylates is 10 and that of the aromatic polyurethane acrylates is 2, the prepared topcoat not only has a good matte effect and skin feel, but also has high hardness while ensuring good adhesion and resistance to yellowing. The applicant speculates that this is because the 10-functionality aliphatic polyurethane acrylate molecular chain contains carbon-carbon double bonds and urethane bonds, resulting in high reactivity; while the 2-functionality aromatic polyurethane acrylate has both flexible and rigid groups. Therefore, using both in combination increases the crosslinking density while reducing the curing shrinkage rate of the curing system, thus avoiding a decrease in adhesion and resistance to yellowing while increasing hardness.

[0018] Preferably, the monomer is selected from one or more combinations of monofunctional acrylate monomers, difunctional acrylate monomers, and trifunctional acrylate monomers.

[0019] Preferably, the monomer is a bifunctional acrylate monomer.

[0020] Preferably, the bifunctional acrylate monomer is selected from one or more combinations of 1,4-cyclohexanediol diacrylate, hydroxyethyl methacrylate, 1,4-butanediol diacrylate, and neopentyl glycol diacrylate.

[0021] Preferably, the bifunctional acrylate monomer is selected from a combination of 1,4-cyclohexanediethanol diacrylate and hydroxyethyl methacrylate.

[0022] Preferably, the mass ratio of 1,4-cyclohexanediethanol diacrylate to hydroxyethyl methacrylate is (15-20):(3-5).

[0023] Preferably, the photoinitiator is selected from one or more combinations of photoinitiator TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), photoinitiator MBF (methyl benzoylformate), photoinitiator 184 (1-hydroxycyclohexylphenyl ketone), and photoinitiator 1173 (2-hydroxy-methylphenylpropane-1-one).

[0024] Preferably, the photoinitiator is a combination of TPO and MBF.

[0025] Preferably, the mass ratio of TPO to MBF is (0.1-0.5):(0.1-0.5).

[0026] Preferably, the leveling agent is selected from one or more combinations of polyether siloxane copolymers, organosilicon acrylates, and polydimethylsiloxane.

[0027] Preferably, the leveling agent is a polyether siloxane copolymer.

[0028] Preferably, the matte skin-feel coating is prepared by mixing the raw materials evenly.

[0029] A second aspect of the present invention provides a method for using a matte skin-feel topcoat, comprising the following steps:

[0030] (1) Apply the topcoat onto the UV primer after sanding and dust removal with a 400# sander belt using a forward or reverse roller or a laser roller.

[0031] (2) Leveling in the 50℃ infrared leveling section for 1-2 minutes;

[0032] (3) LED lamp pre-curing;

[0033] (4) Curing with a 172nm excimer lamp;

[0034] (5) Curing with a mercury lamp.

[0035] Preferably, the coating amount of the forward and reverse rollers or laser roller coating is 25-30 g / m². 2 .

[0036] Preferably, the pre-curing time of the LED lamp is 15 to 30 seconds.

[0037] Preferably, the curing time of the 172nm excimer lamp is 15–30 seconds.

[0038] Preferably, the curing time of the mercury lamp is 15 to 30 seconds.

[0039] Beneficial effects:

[0040] 1. When the excimer resin is polyurethane acrylate, and the polyurethane acrylate is a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate, the prepared topcoat has a good matte effect and skin feel.

[0041] 2. In this application, when the functionality of the aliphatic polyurethane acrylate is ≥6 and the functionality of the aromatic polyurethane acrylate is ≤4, especially when the functionality of the aliphatic polyurethane acrylate is 10 and the functionality of the aromatic polyurethane acrylate is 2, the prepared topcoat not only has a good matte effect and skin feel, but also has high hardness while ensuring good adhesion and resistance to yellowing.

[0042] 3. When this application uses 1,4-cyclohexanediethanol diacrylate and hydroxyethyl methacrylate in a mass ratio of (15-20):(3-5) as monomers, the curing shrinkage rate is further reduced while the viscosity of the topcoat is reduced.

[0043] 4. This application uses TPO and MBF in a mass ratio of (0.1-0.5):(0.1-0.5), which accelerates the curing of the topcoat and improves its resistance to yellowing.

[0044] 5. The topcoat and application method using the specific raw materials of this application achieve excellent matte effect and skin feel while improving the hardness and yellowing resistance of the topcoat. Detailed Implementation

[0045] Example 1

[0046] Example 1 provides a matte skin-feel topcoat, which, by weight, comprises: 75 parts excimer resin, 22 parts monomer, 0.5 parts photoinitiator, and 0.7 parts leveling agent.

[0047] The excimer resin is polyurethane acrylate.

[0048] The polyurethane acrylate is a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate.

[0049] The aliphatic polyurethane acrylate has a functionality of 10; the viscosity of the 10-functionality aliphatic polyurethane acrylate is 75,000 to 95,000 cps (25°C), purchased from Changxing Chemical, model number: 6195-100.

[0050] The aromatic polyurethane acrylate has a functionality of 2 and was purchased from Tianjin Tianhong Technology Co., Ltd., model number: CX-9340.

[0051] The mass ratio of the aliphatic polyurethane acrylate to the aromatic polyurethane acrylate is 15:75.

[0052] The monomer is a difunctional acrylate monomer; the difunctional acrylate monomer is selected from a combination of 1,4-cyclohexanediol diacrylate and hydroxyethyl methacrylate.

[0053] The mass ratio of 1,4-cyclohexanediethanol diacrylate to hydroxyethyl methacrylate is 18:4.

[0054] The photoinitiator is a combination of TPO and MBF.

[0055] The mass ratio of TPO to MBF is 0.25:0.25.

[0056] The leveling agent is a polyether siloxane copolymer, model: Tego450.

[0057] The matte skin-feel coating is prepared by mixing the raw materials evenly.

[0058] A method for applying a matte finish topcoat includes the following steps:

[0059] (1) Apply the topcoat onto the UV primer after sanding and dust removal with a 400# sander belt using a forward or reverse roller or laser roller;

[0060] (2) Leveling in the 50℃ infrared leveling section for 1 minute;

[0061] (3) LED lamp pre-curing;

[0062] (4) Curing with a 172nm excimer lamp;

[0063] (5) Curing with a mercury lamp.

[0064] The coating amount of the forward and reverse rollers or laser roller coating is 30g / m². 2 .

[0065] The LED light pre-curing time is 20 seconds.

[0066] The curing time of the 172nm excimer lamp is 20s.

[0067] The curing time of the mercury lamp is 20 seconds.

[0068] Example 2

[0069] Example 2 provides a matte skin-feel topcoat, which, by weight, comprises: 75 parts excimer resin, 22 parts monomer, 0.5 parts photoinitiator, and 0.7 parts leveling agent.

[0070] The excimer resin is polyurethane acrylate.

[0071] The polyurethane acrylate is a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate.

[0072] The aliphatic polyurethane acrylate has a functionality of 6; the viscosity of the 6-functionality aliphatic polyurethane acrylate is 25,000 to 40,000 cps (25°C), purchased from Changxing Chemical, model number: 6145-100.

[0073] The aromatic polyurethane acrylate has a functionality of 2 and was purchased from Tianjin Tianhong Technology Co., Ltd., model number: CX-9340.

[0074] The mass ratio of the aliphatic polyurethane acrylate to the aromatic polyurethane acrylate is 15:75.

[0075] The monomer is a difunctional acrylate monomer; the difunctional acrylate monomer is selected from a combination of 1,4-cyclohexanediol diacrylate and hydroxyethyl methacrylate.

[0076] The mass ratio of 1,4-cyclohexanediethanol diacrylate to hydroxyethyl methacrylate is 18:4.

[0077] The photoinitiator is a combination of TPO and MBF.

[0078] The mass ratio of TPO to MBF is 0.25:0.25.

[0079] The leveling agent is a polyether siloxane copolymer, model: Tego450.

[0080] The matte skin-feel coating is prepared by mixing the raw materials evenly.

[0081] A method for applying a matte finish topcoat includes the following steps:

[0082] (1) Apply the topcoat onto the UV primer after sanding and dust removal with a 400# sander belt using a forward or reverse roller or laser roller;

[0083] (2) Leveling in the 50℃ infrared leveling section for 1 minute;

[0084] (3) LED lamp pre-curing;

[0085] (4) Curing with a 172nm excimer lamp;

[0086] (5) Curing with a mercury lamp.

[0087] The coating amount of the forward and reverse rollers or laser roller coating is 30g / m². 2 .

[0088] The LED light pre-curing time is 20 seconds.

[0089] The curing time of the 172nm excimer lamp is 20s.

[0090] The curing time of the mercury lamp is 20 seconds.

[0091] Example 3

[0092] Example 3 provides a matte skin-feel topcoat, which, by weight, comprises: 75 parts excimer resin, 22 parts monomer, 0.5 parts photoinitiator, and 0.7 parts leveling agent.

[0093] The excimer resin is polyurethane acrylate.

[0094] The polyurethane acrylate is a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate.

[0095] The aliphatic polyurethane acrylate has a functionality of 10; the viscosity of the 10-functionality aliphatic polyurethane acrylate is 75,000 to 95,000 cps (25°C), purchased from Changxing Chemical, model number: 6195-100.

[0096] The aromatic polyurethane acrylate has a functionality of 2 and was purchased from Guangdong Lankeluo New Materials Co., Ltd., model: L-6230.

[0097] The mass ratio of the aliphatic polyurethane acrylate to the aromatic polyurethane acrylate is 15:75.

[0098] The monomer is a difunctional acrylate monomer; the difunctional acrylate monomer is selected from a combination of 1,4-cyclohexanediol diacrylate and hydroxyethyl methacrylate.

[0099] The mass ratio of 1,4-cyclohexanediethanol diacrylate to hydroxyethyl methacrylate is 18:4.

[0100] The photoinitiator is a combination of TPO and MBF.

[0101] The mass ratio of TPO to MBF is 0.25:0.25.

[0102] The leveling agent is a polyether siloxane copolymer, model: Tego450.

[0103] The matte skin-feel coating is prepared by mixing the raw materials evenly.

[0104] A method for applying a matte finish topcoat includes the following steps:

[0105] (1) Apply the topcoat onto the UV primer after sanding and dust removal with a 400# sander belt using a forward or reverse roller or laser roller;

[0106] (2) Leveling in the 50℃ infrared leveling section for 1 minute;

[0107] (3) LED lamp pre-curing;

[0108] (4) Curing with a 172nm excimer lamp;

[0109] (5) Curing with a mercury lamp.

[0110] The coating amount of the forward and reverse rollers or laser roller coating is 30g / m². 2 The pre-curing time for the LED light is 20 seconds.

[0111] The curing time of the 172nm excimer lamp is 20s.

[0112] The curing time of the mercury lamp is 20 seconds.

[0113] Performance Tests and Results

[0114] Table 1

[0115]

Claims

1. A matte, skin-feeling topcoat, characterized in that, By weight, the raw materials include: 75 parts excimer resin, 22 parts monomer, 0.5 parts photoinitiator, and 0.7 parts leveling agent; The excimer resin is a polyurethane acrylate; the polyurethane acrylate is a combination of aliphatic polyurethane acrylate and aromatic polyurethane acrylate; the aliphatic polyurethane acrylate has a functionality of 10; the viscosity of the 10-functionality aliphatic polyurethane acrylate is 75,000~95,000 cps, model: 6195-100; the aromatic polyurethane acrylate has a functionality of 2, model: CX-9340; the mass ratio of the aliphatic polyurethane acrylate to the aromatic polyurethane acrylate is 15:

75. The monomer is a difunctional acrylate monomer; the difunctional acrylate monomer is selected from a combination of 1,4-cyclohexanediol diacrylate and hydroxyethyl methacrylate; the mass ratio of 1,4-cyclohexanediol diacrylate to hydroxyethyl methacrylate is 18:

4. The photoinitiator is a combination of TPO and MBF; the mass ratio of TPO to MBF is 0.25:0.

25. The leveling agent is a polyether siloxane copolymer, model: Tego450; The matte skin-feel coating is prepared by mixing the raw materials evenly. The method of applying the matte finish paint includes the following steps: (1) Apply the topcoat to the UV primer after sanding and dust removal with a 400# sander belt using a forward or reverse roller or laser roller; (2) Leveling is performed for 1 minute in the 50℃ infrared leveling section; (3) LED lamp pre-curing; (4) Curing with a 172nm excimer lamp; (5) Curing with a mercury lamp; The coating amount of the forward and reverse rollers or laser roller coating is 30g / m². 2 The pre-curing time for the LED lamp is 20 seconds; the curing time for the 172nm excimer lamp is 20 seconds; and the curing time for the mercury lamp is 20 seconds.

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