A matte melamine finish and its preparation process

Abstract

The present invention relates to the field of finishing technology, and specifically to a matte melamine finish and its preparation process. The present invention includes the following steps: Step S1: Impregnate the base paper of the decorative paper with melamine resin, and after drying at 140 - 150 °C, obtain a pretreated decorative paper; Step S2: Coat one side of the pretreated decorative paper with a matte coating, and after drying, form a matte layer; coat an antibacterial and hydrophobic coating on the matte layer, and after drying, form an antibacterial and hydrophobic coating to obtain a semi-finished decorative paper; Step S3: Coat the other side of the semi-finished decorative paper with melamine resin, and after drying at 140 - 150 °C, obtain the matte melamine finish. The matte melamine finish prepared by the present invention not only has excellent antibacterial properties and hydrophobic and oleophobic properties, but also has the effects of fingerprint prevention and internal matte finish.

Description

Technical Field

[0001] The present invention relates to the technical field of finishing, and particularly to a matte melamine finish and its preparation process. Background Art

[0002] Melamine finish, fully known as melamine impregnated film paper finish, is a type of adhesive paper made from plain or printed decorative paper impregnated with amino resins (melamine formaldehyde resin, urea formaldehyde resin) and dried to a certain extent, having a certain resin content and volatile content. With the increasing emphasis on the health and aesthetics of the home environment, the finishing materials for furniture and building materials have received more and more attention. Matte melamine finish, as a popular finishing option, is widely used in the furniture and building industries due to its unique visual effect and good abrasion resistance, moisture resistance, and easy cleaning properties.

[0003] Due to the characteristics of the matte surface itself, when substances such as sweat or grease touch the door panel, it is extremely easy to leave obvious fingerprint marks and stains, which are particularly conspicuous on the surface of the solid-color finish, greatly affecting the aesthetics of the finish. More importantly, after the moisture, inorganic salts, urea, grease, etc. on the fingers touch the finish, it is easy to leave a layer of fine pollutants, and these pollutants, after adhering to the surface, may breed a large amount of dust, bacteria, and other microorganisms over time. Since people come into frequent contact with these finishes in daily life, bacteria may be transmitted to the human body through these surfaces, posing a health hazard. In addition, the surface of the matte melamine finish is not resistant to scratches, and small scratches will appear particularly conspicuous on the smooth solid-color background, and it is also very difficult to remove these scratches, which is likely to cause visual discomfort.

[0004] Therefore, we propose a matte melamine finish and its preparation process. Summary of the Invention

[0005] The purpose of the present invention is to provide a matte melamine finish and its preparation process to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A preparation process of a matte melamine finish includes the following steps:

[0008] Step S1: Immerse the decorative paper base paper in melamine resin, and after drying at 140 - 150 °C, obtain a pretreated decorative paper;

[0009] Step S2: Coat one side of the pretreated decorative paper with matte coating, and after drying, form a matte layer; coat an antibacterial and hydrophobic coating on the matte layer, and after drying, form an antibacterial and hydrophobic coating to obtain a semi-finished decorative paper;

[0010] Step S3: Coat the other side of the semi-finished decorative paper with melamine resin, and after drying at 140 - 150 °C, obtain a matte melamine finish.

[0011] Further, in the step S1, the amount of melamine resin impregnated in the base paper of the decorative paper is 70 - 90 g / m 2 .

[0012] Further, the preparation process of the matte coating is as follows:

[0013] Mix polyvinyl alcohol, dispersant, and deionized water evenly, then add silica matting powder and mix evenly to obtain a matting powder emulsion; mix modified melamine formaldehyde resin, matting powder emulsion, curing agent, mold release agent, and anti-sticking agent evenly to obtain a matte coating.

[0014] Further, the matting powder emulsion includes the following weight components: 10 - 15 parts of silica matting powder, 10 - 15 parts of polyvinyl alcohol, 0.5 - 2.0 parts of dispersant, and 100 - 200 parts of deionized water.

[0015] Further, the dispersant is polyethylene grafted maleic anhydride.

[0016] Further, the matte coating includes the following weight components: 90 - 110 parts of melamine formaldehyde resin, 5 - 10 parts of matting powder emulsion, 1 - 2 parts of curing agent, 0.1 - 0.3 parts of mold release agent, and 0.1 - 0.3 parts of anti-sticking agent.

[0017] Further, the thickness of the matte layer is 50 - 150 μm.

[0018] Further, the preparation method of the antibacterial and hydrophobic coating is as follows:

[0019] Mix melamine formaldehyde resin, modified antibacterial agent, curing agent, mold release agent, and anti-sticking agent evenly to obtain an antibacterial and hydrophobic coating.

[0020] Further, the antibacterial and hydrophobic coating includes the following weight components: 90 - 110 parts of melamine formaldehyde resin, 1 - 3 parts of modified antibacterial agent, 1 - 2 parts of curing agent, 0.1 - 0.3 parts of mold release agent, and 0.1 - 0.3 parts of anti-sticking agent.

[0021] Further, the preparation method of the modified antibacterial agent is as follows:

[0022] Step (1): Under nitrogen protection, mix octamethylcyclotetrasiloxane, 3,3,3-trifluoropropyltrimethylcyclotrisiloxane, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and tetramethylammonium hydroxide pentahydrate evenly, and react at 110 - 120 °C for 10 - 12 h to obtain an amino-terminated fluorinated organosilicon;

[0023] Step (2): Mix nano-zinc oxide, absolute ethanol, and deionized water evenly, adjust the pH of the system to 3 - 4 with acetic acid, add γ-glycidoxypropyltrimethoxysilane, and react at 30 - 50 °C for 8 - 12 h. After filtration, washing, and drying, epoxy nano-zinc oxide is obtained.

[0024] Step (3): Mix epoxy nano-zinc oxide, amino-terminated fluorinated organosilicon, and deionized water evenly, react at 30 - 40 °C for 4 - 6 h, add isocyanatoethyl methacrylate and dibutyltin dilaurate, and react at 65 - 75 °C for 3 - 5 h. Cool to room temperature, and after filtration, washing, and drying, a double-bond-containing antibacterial agent is obtained.

[0025] Step (4): Under nitrogen protection, ultrasonically disperse the double-bond-containing antibacterial agent in deionized water, heat up to 70 - 80 °C, add dimethyldiallylammonium chloride, perfluorodecyl mercaptan, and azobisisobutyronitrile and mix evenly, react for 22 - 24 h, cool to room temperature, and after centrifugation, washing, and drying, a modified antibacterial agent is obtained.

[0026] Further, in the step (1), the mass ratio of octamethylcyclotetrasiloxane, 3,3,3-trifluoropropyltrimethylcyclotrisiloxane, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and tetramethylammonium hydroxide pentahydrate is 1:(2.5 - 3.0):(0.5 - 0.6):(0.03 - 0.05).

[0027] Further, in the step (2), the mass ratio of nano-zinc oxide, absolute ethanol, deionized water, and γ-glycidoxypropyltrimethoxysilane is 1:(15 - 20):(3 - 5):(2 - 3).

[0028] Further, in the step (3), the mass ratio of epoxy nano-zinc oxide, amino-terminated fluorinated organosilicon, and deionized water is 1:(2 - 4):(8 - 10).

[0029] Further, in the step (3), the mass of isocyanatoethyl methacrylate is 3 - 5 times the mass of epoxy nano-zinc oxide, and the mass ratio of isocyanatoethyl methacrylate to dibutyltin dilaurate is 1:(0.01 - 0.03).

[0030] Further, in the step (4), the mass ratio of the double-bond-containing antibacterial agent, deionized water, dimethyldiallylammonium chloride, perfluorodecyl mercaptan, and azobisisobutyronitrile is 1:(15 - 20):(2 - 4):(1 - 2):(0.03 - 0.05).

[0031] In the above technical solution, an amino-terminated fluorinated organosilicon is obtained by reacting octamethylcyclotetrasiloxane, 3,3,3-trifluoropropyltrimethylcyclotrisiloxane, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane; nano-zinc oxide is surface-modified with γ-glycidoxypropyltrimethoxysilane to obtain epoxy-functionalized nano-zinc oxide; an amino-terminated fluorinated organosilicon and epoxy-functionalized nano-zinc oxide undergo a ring-opening reaction to produce hydroxyl groups simultaneously, and then continue to react with isocyanatoethyl methacrylate under the action of dibutyltin dilaurate catalyst to introduce double bonds, resulting in a double-bond-containing antibacterial agent; finally, under the action of azobisisobutyronitrile initiator, the double-bond-containing antibacterial agent, dimethyldiallylammonium chloride, and perfluorodecyl mercaptan react to obtain a modified antibacterial agent.

[0032] Further, the curing agent is a morpholine curing agent.

[0033] Further, the mold release agent is polyethylene wax.

[0034] Further, the anti-sticking agent is an organosilicon surfactant.

[0035] Further, the thickness of the antibacterial and hydrophobic coating is 80 - 160 μm.

[0036] Further, in step S3, the dosage of melamine resin coated on the semi-finished decorative paper is 30 - 50 g / m 2 .

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. A matte melamine finish and its preparation process according to the present invention react octamethylcyclotetrasiloxane, 3,3,3-trifluoropropyltrimethylcyclotrisiloxane, and 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane to obtain an amino-terminated fluorinated silicone; surface-modify nano-zinc oxide with γ-glycidoxypropyltrimethoxysilane to obtain epoxy-functionalized nano-zinc oxide; carry out a ring-opening reaction between the amino-terminated fluorinated silicone and the epoxy-functionalized nano-zinc oxide, and simultaneously produce hydroxyl groups, which continue to react with isocyanatoethyl methacrylate to introduce double bonds, obtaining a double-bond-containing antibacterial agent. The introduction of fluorine not only improves the surface properties but also endows the finish with better stain resistance, fingerprint resistance, and easy cleanability; finally, under the action of an initiator, the double-bond-containing antibacterial agent, dimethyldiallylammonium chloride, and perfluorodecyl mercaptan react to obtain a modified antibacterial agent, which not only enhances the antibacterial effect but also imparts hydrophobic and oleophobic properties to the finish, further improving its anti-fouling and self-cleaning performance; at the same time, the introduction of nano-zinc oxide greatly improves the ultraviolet (UV) resistance and heat resistance of the material, thereby enhancing the anti-aging ability of the finish. Therefore, the matte melamine finish prepared by the present invention not only has excellent antibacterial and hydrophobic / oleophobic properties but also has the effect of anti-fingerprint and inner matte effect. Specific Embodiments

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] In this embodiment, the printed decorative base paper: the specification is 80 g / m 2 , the thickness is 300 μm, sourced from Jiangsu Xingguang New Material Technology Co., Ltd.; melamine resin: CAS No. 108-78-1, sourced from Shandong Yushuo Chemical Co., Ltd.; silica matting powder: the particle size is 4 μm, model TS100, sourced from Guangdong Luwei New Material Technology Co., Ltd.; nano-zinc oxide: the particle size is 10-30 nm, sourced from Daciyong Nano Technology (Changzhou) Co., Ltd.; curing agent: morpholine curing agent, model 231202, sourced from Guangzhou Jiatao Chemical Co., Ltd.; mold release agent: polyethylene wax, model 0200P, sourced from Guangdong Southern BASF Wax Industry Co., Ltd.; anti-sticking agent: silicone surfactant, brand BYK-3456; polyvinyl alcohol: model Changchun BP-17, sourced from Guangzhou Yinhuan Chemical Co., Ltd.; melamine formaldehyde resin: the solid content is 35.6%, the viscosity is 33 mPa·s, sourced from Shandong Jining Huakai Resin Co., Ltd.

[0041] In the following examples and comparative examples, 1 part is equal to 10 g.

[0042] Example 1: A preparation process of a matte melamine finish, comprising the following processes:

[0043] Step S1: Impregnate the base decorative paper with melamine resin (dosage: 70 g / m 2 ), and after drying at 140 °C, obtain the pretreated decorative paper;

[0044] Step S2: Coat one side of the pretreated decorative paper with matte coating, and after drying, form a matte layer; coat an antibacterial and hydrophobic coating on the matte layer, and after drying, form an antibacterial and hydrophobic coating layer to obtain a semi-finished decorative paper;

[0045] Step S3: Coat the other side of the semi-finished decorative paper with melamine resin (dosage: 30 g / m 2 ), and after drying at 140 °C, obtain the matte melamine finish;

[0046] The preparation process of the matte coating is as follows:

[0047] Mix 10 parts of polyvinyl alcohol, 0.5 part of dispersant and 100 parts of deionized water evenly, then add 10 parts of silica matting powder and mix evenly to obtain a matting powder emulsion; mix 90 parts of melamine formaldehyde resin, 5 parts of matting powder emulsion, 1 part of curing agent, 0.1 part of mold release agent and 0.1 part of anti-sticking agent evenly to obtain the matte coating;

[0048] The preparation method of the antibacterial and hydrophobic coating is as follows:

[0049] Mix 90 parts of melamine formaldehyde resin, 1 part of modified antibacterial agent, 1 part of curing agent, 0.1 part of mold release agent and 0.1 part of anti-sticking agent evenly to obtain the antibacterial and hydrophobic coating;

[0050] The preparation method of the modified antibacterial agent is as follows:

[0051] Step (1): Under nitrogen protection, mix 1 part of octamethylcyclotetrasiloxane, 2.5 parts of 3,3,3-trifluoropropyltrimethylcyclotrisiloxane, 0.5 part of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 0.03 part of tetramethylammonium hydroxide pentahydrate evenly, and react at 110 °C for 10 h to obtain an amino-terminated fluorinated silicone;

[0052] Step (2): Mix 1 part of nano-zinc oxide, 15 parts of absolute ethanol and 3 parts of deionized water evenly, adjust the pH of the system to 3 with acetic acid, add 2 parts of γ-glycidoxypropyltrimethoxysilane, and react at 30 °C for 8 h. After filtration, washing and drying, obtain epoxy nano-zinc oxide;

[0053] Step (3): Mix 1 part of epoxy nanometer zinc oxide, 2 parts of amino-terminated fluorinated silicone, and 8 parts of deionized water evenly, react at 30 °C for 4 h, add 3 parts of isocyanatoethyl methacrylate and 0.03 part of dibutyltin dilaurate, react at 65 °C for 3 h, cool to room temperature, and obtain a double-bond-containing antibacterial agent after filtration, washing, and drying;

[0054] Step (4): Under nitrogen protection, ultrasonically disperse 1 part of the double-bond-containing antibacterial agent in 15 parts of deionized water, heat up to 70 °C, add 2 parts of dimethyldiallylammonium chloride, 1 part of perfluorodecyl mercaptan, and 0.03 part of azobisisobutyronitrile, mix evenly, react for 22 h, cool to room temperature, and obtain a modified antibacterial agent after centrifugation, washing, and drying.

[0055] Example 2: A preparation process of a matte melamine finish, including the following processes:

[0056] Step S1: Immerse the base paper of the decorative paper in melamine resin (the dosage is 80 g / m 2 ), and obtain a pretreated decorative paper after drying at 145 °C;

[0057] Step S2: Coat one side of the pretreated decorative paper with matte coating, and form a matte layer after drying; coat an antibacterial hydrophobic coating on the matte layer, and form an antibacterial hydrophobic coating after drying to obtain a semi-finished decorative paper;

[0058] Step S3: Coat the other side of the semi-finished decorative paper with melamine resin (the dosage is 40 g / m 2 ), and obtain a matte melamine finish after drying at 145 °C;

[0059] The preparation process of the matte coating is as follows:

[0060] Mix 12 parts of polyvinyl alcohol, 1 part of dispersant, and 150 parts of deionized water evenly, then add 12 parts of silica matting powder and mix evenly to obtain a matting powder emulsion; mix 100 parts of melamine formaldehyde resin, 8 parts of the matting powder emulsion, 1.5 parts of curing agent, 0.2 part of demolding agent, and 0.2 part of anti-sticking agent evenly to obtain a matte coating;

[0061] The preparation method of the antibacterial hydrophobic coating is as follows:

[0062] Mix 100 parts of melamine formaldehyde resin, 3 parts of modified antibacterial agent, 1.5 parts of curing agent, 0.2 part of demolding agent, and 0.2 part of anti-sticking agent evenly to obtain an antibacterial hydrophobic coating;

[0063] The preparation method of the modified antibacterial agent is as follows:

[0064] Step (1): Under nitrogen protection, 5 parts of octamethylcyclotetrasiloxane, 14 parts of trifluoropropyltrimethylcyclotrisiloxane, 2.75 parts of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 0.2 part of tetramethylammonium hydroxide pentahydrate were mixed evenly and reacted at 115 °C for 11 h to obtain amino-terminated fluorinated organosilicon;

[0065] Step (2): 3 parts of nano-zinc oxide, 50 parts of absolute ethanol and 12 parts of deionized water were mixed evenly, the pH of the system was adjusted to 3.5 with acetic acid, 7.5 parts of γ-glycidoxypropyltrimethoxysilane was added, and the reaction was carried out at 40 °C for 10 h. After filtration, washing and drying, epoxy nano-zinc oxide was obtained;

[0066] Step (3): 3 parts of epoxy nano-zinc oxide, 9 parts of amino-terminated fluorinated organosilicon and 27 parts of deionized water were mixed evenly and reacted at 35 °C for 5 h. 12 parts of isocyanatoethyl methacrylate and 0.24 part of dibutyltin dilaurate were added, and the reaction was carried out at 70 °C for 4 h. After cooling to room temperature, filtration, washing and drying, a double-bond-containing antibacterial agent was obtained;

[0067] Step (4): Under nitrogen protection, 3 parts of the double-bond-containing antibacterial agent was ultrasonically dispersed in 50 parts of deionized water, the temperature was raised to 75 °C, 9 parts of dimethyldiallylammonium chloride, 4.5 parts of perfluorodecyl mercaptan and 0.12 part of azobisisobutyronitrile were added and mixed evenly, and the reaction was carried out for 22 h. After cooling to room temperature, centrifugation, washing and drying, a modified antibacterial agent was obtained.

[0068] Example 3: A preparation process of a matte melamine finish, including the following processes:

[0069] Step S1: The decorative paper base paper was impregnated with melamine resin (dosage: 90 g / m 2 ), and after drying at 150 °C, a pretreated decorative paper was obtained;

[0070] Step S2: One side of the pretreated decorative paper was coated with a matte coating, and after drying, a matte layer was formed; an antibacterial hydrophobic coating was coated on the matte layer, and after drying, an antibacterial hydrophobic coating was formed to obtain a semi-finished decorative paper;

[0071] Step S3: Melamine resin was coated on the other side of the semi-finished decorative paper, and after drying at 150 °C, a matte melamine finish was obtained;

[0072] The preparation process of the matte coating is as follows:

[0073] Mix 15 parts of polyvinyl alcohol, 2.0 parts of dispersant and 200 parts of deionized water evenly, then add 15 parts of silica matting powder and mix evenly to obtain a matting powder emulsion; mix 110 parts of melamine formaldehyde resin, the matting powder emulsion, 2 parts of curing agent, 1 - 3 parts of mold release agent and 1 - 3 parts of anti - sticking agent evenly to obtain a matte coating;

[0074] The preparation method of the antibacterial and hydrophobic coating is as follows:

[0075] Mix 110 parts of melamine formaldehyde resin, 5 parts of modified antibacterial agent, 2 parts of curing agent, 0.3 part of mold release agent and 0.3 part of anti - sticking agent evenly to obtain an antibacterial and hydrophobic coating;

[0076] The preparation method of the modified antibacterial agent is as follows:

[0077] Step (1): Under nitrogen protection, mix 5 parts of octamethylcyclotetrasiloxane, 15 parts of 3,3,3 - trifluoropropyltrimethylcyclotrisiloxane, 3 parts of 1,3 - bis(3 - aminopropyl)-1,1,3,3 - tetramethyldisiloxane and 0.25 part of tetramethylammonium hydroxide pentahydrate evenly, and react at 120 °C for 12 h to obtain an amino - terminated fluorinated organosilicon;

[0078] Step (2): Mix 5 parts of nano - zinc oxide, 100 parts of absolute ethanol and 25 parts of deionized water evenly, adjust the pH of the system to 4 with acetic acid, add 15 parts of γ - glycidoxypropyltrimethoxysilane, and react at 50 °C for 12 h. After filtration, washing and drying, obtain epoxy - modified nano - zinc oxide;

[0079] Step (3): Mix 5 parts of epoxy - modified nano - zinc oxide, 20 parts of amino - terminated fluorinated organosilicon and 50 parts of deionized water evenly, react at 40 °C for 6 h, add 25 parts of isocyanatoethyl methacrylate and 0.75 part of dibutyltin dilaurate, react at 75 °C for 5 h, cool to room temperature, and after filtration, washing and drying, obtain a double - bond - containing antibacterial agent;

[0080] Step (4): Under nitrogen protection, ultrasonically disperse 5 parts of the double - bond - containing antibacterial agent in 100 parts of deionized water, heat up to 80 °C, add 20 parts of dimethyldiallylammonium chloride, 10 parts of perfluorodecyl mercaptan and 0.25 part of azobisisobutyronitrile and mix evenly, react for 24 h, cool to room temperature, and after centrifugation, washing and drying, obtain the modified antibacterial agent.

[0081] Comparative Example 1: A preparation process of a matte melamine finish, including the following process:

[0082] Compared with Example 2, in Comparative Example 1, the modified antibacterial agent is replaced with nano - zinc oxide of the same mass, and other steps are the same as those in Example 2.

[0083] Comparative Example 2: A preparation process of a matte melamine finish, including the following processes:

[0084] The preparation method of the modified antibacterial agent is as follows:

[0085] Under nitrogen protection, 1.5 parts of dimethyldiallylammonium chloride, 1.5 parts of perfluorodecyl mercaptan and 0.12 part of azobisisobutyronitrile are mixed evenly, reacted for 22 h, cooled to room temperature, and after centrifugation, washing and drying, the modified antibacterial agent is obtained.

[0086] Compared with Example 2, Comparative Example 2 does not add a double bond-containing antibacterial agent, and other steps are the same as those in Example 2.

[0087] Comparative Example 3: A preparation process of a matte melamine finish, including the following processes:

[0088] The preparation method of the modified antibacterial agent is as follows:

[0089] Step (1): Under nitrogen protection, 5 parts of octamethylcyclotetrasiloxane, 14 parts of trifluoropropyltrimethylcyclotrisiloxane, 2.75 parts of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and 0.2 part of tetramethylammonium hydroxide pentahydrate are mixed evenly and reacted at 115 °C for 11 h to obtain an amino-terminated fluorinated organosilicon;

[0090] Step (2): 3 parts of nano-zinc oxide, 50 parts of absolute ethanol and 12 parts of deionized water are mixed evenly, the pH of the system is adjusted to 3.5 with acetic acid, 7.5 parts of γ-glycidoxypropyltrimethoxysilane are added, and the reaction is carried out at 40 °C for 10 h. After filtration, washing and drying, epoxidized nano-zinc oxide is obtained;

[0091] Step (3): 3 parts of epoxidized nano-zinc oxide, 9 parts of amino-terminated fluorinated organosilicon and 27 parts of deionized water are mixed evenly, reacted at 35 °C for 5 h, 12 parts of isocyanatoethyl methacrylate and 0.24 part of dibutyltin dilaurate are added, and the reaction is carried out at 70 °C for 4 h. After cooling to room temperature, filtration, washing and drying, a double bond-containing antibacterial agent is obtained;

[0092] Step (4): Under nitrogen protection, 3 parts of the double bond-containing antibacterial agent are ultrasonically dispersed in 50 parts of deionized water, the temperature is raised to 75 °C, 1.5 parts of dimethyldiallylammonium chloride, 1.5 parts of perfluorodecyl mercaptan and 0.12 part of azobisisobutyronitrile are added and mixed evenly, reacted for 22 h, cooled to room temperature, and after centrifugation, washing and drying, the modified antibacterial agent is obtained.

[0093] Compared with Example 2, in step (4) of Comparative Example 4, the mass ratio of the double bond-containing antibacterial agent, dimethyldiallylammonium chloride and perfluorodecyl mercaptan is 1:0.5:0.5, and other steps are the same as those in Example 2.

[0094] Experiment: The matte melamine finishes obtained in Examples 1-3 and Comparative Examples 1-3 were hot-pressed with medium-density fiberboard (with dimensions of 300 mm × 300 mm × 18 mm, moisture content of 7-10%, sourced from Shandong Dongyu Hongxiang Decoration Materials Co., Ltd.) using a hot press (pressing temperature of 180 °C, pressing time of 30 s, pressing pressure of 14 MPa) to obtain specimens, and their properties were tested and the test results were recorded respectively:

[0095] The water contact angle was measured using a JC2000DM type contact angle measuring instrument, and the volume of deionized water was 2 μL.

[0096] Anti-fingerprint performance detection method: Wash hands with clean water and dry them with a towel. After maintaining a natural state (not touching any objects) for 10 min, press the surface of the specimen forcefully, then move the hands away, observe the state of fingerprint disappearance and record the time. The same group of specimens was repeated 6 times.

[0097] The stain resistance was determined according to GB / T 34722-2017 "Decorative plywood and blockboard with impregnated film paper surface". The size of the specimen was 100 mm × 100 mm. If it reached level 4 or above, it was considered OK; otherwise, it was considered NG.

[0098] The antibacterial performance was determined according to the LY / T1926-2010 standard. The size of the specimen was 50 mm × 50 mm, and the test strain was Staphylococcus aureus (ATCC 6538).

[0099] The test results are as follows:

[0100] Based on the data in the above table, the following conclusions can be clearly obtained:

[0101] 1. Compared with Examples 1-3, the water contact angle, stain resistance, and antibacterial rate of the products obtained in Comparative Examples 1 and 2 decreased, indicating that the modified antibacterial agent prepared by the present invention has better hydrophobic, stain resistance, and antibacterial effects compared to nano-zinc oxide. At the same time, introducing the double-bond-containing antibacterial agent prepared by the present invention can further improve the hydrophobicity and antibacterial property of the material.

[0102] 2. Compared with Examples 1-3, the water contact angle, stain resistance, and antibacterial rate of the products obtained in Comparative Example 3 decreased to some extent, indicating that when the addition amounts of dimethyldiallylammonium chloride and perfluorodecyl mercaptan are reduced, the antibacterial and hydrophobic properties of the material will be affected. The modified antibacterial agent prepared by the present invention is affected by its component ratio. By selecting the component ratio within the above range, the prepared material has better antibacterial and hydrophobic effects.

[0103] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A preparation process for a matte melamine finish, characterized in that: It includes the following steps: Step S1: Impregnate the base decorative paper with melamine resin, and after drying at 140 - 150 °C, obtain the pretreated decorative paper; Step S2: Coat one side of the pretreated decorative paper with matte coating, and after drying, form a matte layer; coat an antibacterial and hydrophobic coating on the matte layer, and after drying, form an antibacterial and hydrophobic coating to obtain a semi-finished decorative paper; Step S3: Coat the other side of the semi-finished decorative paper with melamine resin, and after drying at 140 - 150 °C, obtain a matte melamine finish; The preparation method of the antibacterial and hydrophobic coating is as follows: Mix melamine formaldehyde resin, modified antibacterial agent, curing agent, release agent and anti-sticking agent evenly to obtain the antibacterial and hydrophobic coating; The preparation method of the modified antibacterial agent is as follows: Step (1): Under nitrogen protection, mix octamethylcyclotetrasiloxane, 3,3,3-trifluoropropyltrimethylcyclotrisiloxane, 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and tetramethylammonium hydroxide pentahydrate evenly, and react at 110 - 120 °C for 10 - 12 h to obtain an amino-terminated fluorinated organosilicon; Step (2): Mix nano-zinc oxide, absolute ethanol and deionized water evenly, adjust the pH of the system to 3 - 4 with acetic acid, add γ-glycidoxypropyltrimethoxysilane, and react at 30 - 50 °C for 8 - 12 h. After filtration, washing and drying, obtain epoxy nano-zinc oxide; Step (3): Mix epoxy nano-zinc oxide, amino-terminated fluorinated organosilicon and deionized water evenly, react at 30 - 40 °C for 4 - 6 h, add isocyanatoethyl methacrylate and dibutyltin dilaurate, react at 65 - 75 °C for 3 - 5 h, cool to room temperature, and after filtration, washing and drying, obtain a double-bond-containing antibacterial agent; Step (4): Under nitrogen protection, ultrasonically disperse the double-bond-containing antibacterial agent in deionized water, heat up to 70 - 80 °C, add dimethyldiallylammonium chloride, perfluorodecyl mercaptan and azobisisobutyronitrile and mix evenly, react for 22 - 24 h, cool to room temperature, and after centrifugation, washing and drying, obtain the modified antibacterial agent.

2. The preparation process of a matte melamine finish according to claim 1, characterized in that: In the step S1, the amount of melamine resin impregnated in the base paper of the decorative paper is 70-90 g / m 2 .

3. The preparation process of a matte melamine finish according to claim 1, characterized in that: The preparation process of the matte coating is as follows: Mix polyvinyl alcohol, dispersant and deionized water evenly, and then add silica matting powder and mix evenly to obtain a matting powder emulsion; mix melamine formaldehyde resin, matting powder emulsion, curing agent, release agent and anti-sticking agent evenly to obtain the matte coating.

4. The preparation process of a matte melamine finish according to claim 3, characterized in that: The matting powder emulsion includes the following weight components: 10 - 15 parts of silica matting powder, 10 - 15 parts of polyvinyl alcohol, 0.5 - 2.0 parts of dispersant, and 100 - 200 parts of deionized water.

5. The preparation process of a matte melamine finish according to claim 3, characterized in that: The matte coating includes the following weight components: 90 - 110 parts of melamine formaldehyde resin, 5 - 10 parts of matting powder emulsion, 1 - 2 parts of curing agent, 0.1 - 0.3 parts of release agent, and 0.1 - 0.3 parts of anti-sticking agent.

6. The preparation process of a matte melamine finish according to claim 1, characterized in that: The antibacterial and hydrophobic coating includes the following weight components: 90 - 110 parts of melamine formaldehyde resin, 1 - 5 parts of modified antibacterial agent, 1 - 2 parts of curing agent, 0.1 - 0.3 parts of release agent, and 0.1 - 0.3 parts of anti-sticking agent.

7. The preparation process of a matte melamine finish according to claim 1, characterized in that: The thickness of the antibacterial and hydrophobic coating is 80 - 160 μm.

8. A matte melamine finish prepared by the preparation process according to any one of claims 1-7.

Images