A fast light-curing PVAc-based water-based emulsion wood coating and its preparation method

Abstract

A fast-light-curing PVAc-based water-based emulsion wood coating and its preparation method belong to the technical field of wood coatings. To increase the curing speed of the wood coating, the present invention uses the total amount of reacted vinyl acetate and styrene as a benchmark to adjust the mass ratio of the raw materials, then prepares a core seed emulsion, prepares thiol-functionalized core-shell latex particles, and prepares a fast-light-curing PVAc-based water-based emulsion wood coating: the obtained thiol-functionalized core-shell latex particles are cooled to 60°C, and pre-emulsified active monomers are added dropwise at a rate of 0.5 ml / min to obtain a fast-light-curing PVAc-based water-based emulsion wood coating. The emulsion coating prepared by the present invention has a simple production process, easy-to-control reaction conditions, and does not change the conventional emulsion polymerization industry. At the same time, the emulsion has excellent stability and adjustable paint film properties. When used for wood coating, it can cure in as fast as 12 seconds, significantly improving the coating efficiency and comparable to the curing speed of solvent-based light-curing coatings.

Description

Technical Field

[0001] The invention belongs to the technical field of wood coatings, and particularly relates to a fast light-curing PVAc-based water-based emulsion wood coating and a preparation method thereof. Background Art

[0002] Water-based paints, which use water as a solvent, can significantly alleviate environmental pollution and significantly reduce production costs. However, low application efficiency during daily use limits their practical application. Currently, the slow film-forming rate of water-based paints is typically addressed by increasing the drying temperature. However, excessively high film-forming temperatures can cause cracking in the coating, seriously affecting its performance. Therefore, the development of water-based wood coatings with fast film-forming rates and superior performance is urgently needed.

[0003] Core-shell emulsions, due to their unique multi-component phase separation structure, provide a structural basis for improving emulsion performance and functionality. By utilizing the special structural effects of core-shell emulsions, the core layer and shell polymers with specific functions can be stabilized together, thereby significantly improving the performance of the emulsion and potentially giving it new functional properties. This provides a new approach to achieving rapid curing of emulsion coatings. Ultraviolet (UV) curing technology is hailed as a new technology for the green industry of the 21st century due to its high efficiency, environmental protection, and energy saving. Light-curing coatings can be cured instantly under UV light. Combining UV curing technology with water-based coatings is expected to significantly improve the coating efficiency of water-based coatings while also improving their performance. Summary of the Invention

[0004] The problem to be solved by the present invention is to improve the curing speed of wood coatings, and a fast light-curing PVAc-based water-based emulsion wood coating and a preparation method thereof are provided.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises the following steps:

[0007] S1. Weigh the raw materials based on the total amount of vinyl acetate and styrene to be reacted. The mass ratio of the raw materials is as follows:

[0008] Total deionized water: 125-150%,

[0009] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0010] Shell monomer: 30-50%, the shell monomer is styrene,

[0011] Shell monomer 2: 20-32%, wherein the shell monomer 2 is dipentene,

[0012] Grafting monomer: 1.5-2.5%,

[0013] Emulsifier: 4.5-5.5%,

[0014] Initiator: 0.30~0.40%,

[0015] pH buffer: 0.5-1.5%,

[0016] Thiol monomer: 36.75~110.25%,

[0017] Active monomer: 47.25~335%;

[0018] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0019] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 is stabilized to 80 ° C, and the remaining core monomer 1 is added dropwise. The dropwise acceleration rate of the core monomer 1 is 0.4 to 0.6 ml / min. After 30 minutes of dropwise addition, a certain mass of the second batch of initiator solution is added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions are completed, the grafted monomer is added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer is added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes of dropwise addition, the speed is adjusted to 0.3 ml / min. After the shell monomer is added, the temperature is raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the shell monomer 2 is added dropwise. After the shell monomer 2 is added dropwise, the temperature is kept warm for 30 minutes. After the end of the insulation, the system is heated to 95 ° C and the thiol monomer is added dropwise. When the addition is complete, the temperature is kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0020] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The temperature of the thiol-functionalized core-shell latex particles obtained in step S3 was cooled to 60°C, and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating.

[0021] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is hexanediol diacrylate or triol dimethacrylate.

[0022] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 125%, core monomer 1 is 50%, shell monomer is 50%, shell monomer 2 is 32%, graft monomer is 1.5%, emulsifier is 5%, initiator is 0.3%, pH buffer is 0.5%, thiol monomer is 36.75%, and active monomer is 47.25%.

[0023] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 130%, core layer monomer 1 is 70%, shell layer monomer is 30%, shell layer monomer 2 is 32%, graft monomer is 2.5%, emulsifier is 5%, initiator is 0.4%, pH buffer is 1.5%, thiol monomer is 73.5%, and active monomer is 94.5%.

[0024] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 125%, core layer monomer 1 is 60%, shell layer monomer is 40%, shell layer monomer 2 is 32%, graft monomer is 2%, emulsifier is 5%, initiator is 0.35%, pH buffer is 1%, thiol monomer is 110.25%, and active monomer is 189%.

[0025] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6wt% initiator solution, and the amount of initiator added is 70-72% of the mass of the initiator in step S1.

[0026] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt % initiator solution, and the amount of initiator added is 28-30% of the mass of the initiator in step S1.

[0027] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer.

[0028] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating is provided, wherein the fast light-curing PVAc-based water-based emulsion wood coating has a curing time of 12 to 20 seconds.

[0029] Beneficial effects of the present invention:

[0030] The present invention discloses a method for preparing a fast light-curing PVAc-based water-based emulsion wood coating. Based on the preparation process of PVAc / PS core-shell emulsion, a thiol group is introduced into the core layer of the latex particle to prepare a light-curing PVAc-based core-shell emulsion. First, a diene monomer is selected to perform functional modification on the PVAc-based core-shell latex particles. The diene monomer contains two asymmetric double bonds. The vinyl double bond in its structure is highly active and can participate in the polymerization of the latex particle shell during emulsion polymerization, while the less active cyclohexene structure can be retained in the shell layer, thereby constructing a core-shell structure latex particle with a surface containing a photocrosslinkable double bond; secondly, a thiol monomer dithiothreitol (DTT) is added, wherein one thiol group undergoes a click reaction with the shell double bond, and the other thiol group is retained on the shell protrusion, thereby preparing a core-shell latex particle with a shell containing a thiol group; finally, a pre-emulsified active monomer is added in the late stage of polymerization to obtain a fast light-curing PVAc-based water-based core-shell emulsion. The entire synthesis process basically does not change the conventional emulsion polymerization method, and the emulsion can achieve rapid light curing, which significantly improves the coating efficiency of water-based coatings and improves the performance of wood paint films.

[0031] The present invention discloses a method for preparing a fast-photocuring PVAc-based water-based emulsion wood coating. The prepared light-curing PVAc-based water-based emulsion has a simple production process, easily controllable reaction conditions, and does not change the conventional emulsion polymerization industry. At the same time, the emulsion has excellent stability, and the properties of the prepared emulsion paint film are adjustable.

[0032] The invention discloses a method for preparing a fast-light-curing PVAc-based water-based emulsion wood coating. The prepared emulsion coating can be cured in as fast as 12 seconds when applied to wood coating, significantly improving the coating efficiency and being comparable to the curing speed of solvent-based light-curing coatings.

[0033] The present invention discloses a method for preparing a fast-acting, light-curing PVAc-based water-based emulsion wood coating. The prepared light-curing PVAc-based water-based emulsion uses water as a solvent, is free of volatile organic compounds (VOCs), reduces VOC emissions, and is environmentally friendly, alleviating environmental pollution issues. The prepared light-curing PVAc-based water-based emulsion has broad application prospects in the field of water-based wood coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 SEM images of thiol-functionalized core-shell latex particles with different DTT contents prepared according to the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in Specific Embodiment 1, wherein (a) the molar mass ratio of DTT to dipentene is 1:1, (b) the molar mass ratio of DTT to dipentene is 2:1, and (c) the molar mass ratio of DTT to dipentene is 3:1;

[0035] Figure 2 This is a Fourier transform infrared spectrum of thiol-functionalized core-shell latex particles prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in the first embodiment;

[0036] Figure 3 DSC curves of thiol-functionalized core-shell latex particles with different DTT contents prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in the first embodiment;

[0037] Figure 4 Curves of the photocuring time of a fast photocuring PVAc-based water-based emulsion wood coating corresponding to different DTT contents prepared by the method for preparing a fast photocuring PVAc-based water-based emulsion wood coating described in the first embodiment;

[0038] Figure 5 Photos of coated samples of a fast light-curing PVAc-based water-based emulsion wood coating corresponding to different DTT contents prepared according to the preparation method of a fast light-curing PVAc-based water-based emulsion wood coating described in Specific Embodiment 1;

[0039] Figure 6 Curves of light-curing time of a fast light-curing PVAc-based water-based emulsion wood coating corresponding to different TMPTA contents prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in the second embodiment;

[0040] Figure 7 These are photos of coated samples of a fast light-curing PVAc-based water-based emulsion wood coating corresponding to different TMPTA contents, prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in Specific Embodiment 2. DETAILED DESCRIPTION

[0041] In order to make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. That is, the specific embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the specific embodiments of the present invention described and illustrated in the drawings herein can be arranged and designed in various different configurations, and the present invention can also have other embodiments.

[0042] Therefore, the following detailed description of the specific embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected specific embodiments of the present invention. All other specific embodiments obtained by those skilled in the art based on the specific embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] In order to further understand the content, features and effects of the present invention, the following specific embodiments are given as examples, and the attached Figure 1 -Attached Figure 7 The detailed instructions are as follows: Specific implementation method one:

[0045] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises the following steps:

[0046] S1. Weigh the raw materials based on the total amount of vinyl acetate and styrene to be reacted. The mass ratio of the raw materials is as follows:

[0047] Total deionized water: 125-150%,

[0048] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0049] Shell monomer: 30-50%, the shell monomer is styrene,

[0050] Shell monomer 2: 20-32%, the core monomer 2 is dipentene,

[0051] Grafting monomer: 1.5-2.5%,

[0052] Emulsifier: 4.5-5.5%,

[0053] Initiator: 0.30~0.40%,

[0054] pH buffer: 0.5-1.5%,

[0055] Thiol monomer: 36.75~110.25%,

[0056] Active monomer: 47.25~335%;

[0057] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is hexanediol diacrylate;

[0058] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 125%, core monomer 1 is 60%, shell monomer is 40%, shell monomer 2 is 32%, graft monomer is 2%, emulsifier is 5%, initiator is 0.35%, pH buffer is 1%, thiol monomer is 110.25%, and active monomer is 189%;

[0059] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0060] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6 wt % initiator solution, and the amount of initiator added is 71.4% of the mass of the initiator in step S1;

[0061] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 is stabilized to 80 ° C, and the remaining core monomer 1 is added dropwise. The dropwise acceleration rate of the core monomer 1 is 0.4 to 0.6 ml / min. After 30 minutes of dropwise addition, a certain mass of the second batch of initiator solution is added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions are completed, the grafted monomer is added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer is added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes of dropwise addition, the speed is adjusted to 0.3 ml / min. After the shell monomer is added, the temperature is raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the shell monomer 2 is added dropwise. After the shell monomer 2 is added dropwise, the temperature is kept warm for 30 minutes. After the end of the insulation, the system is heated to 95 ° C and the thiol monomer is added dropwise. When the addition is complete, the temperature is kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0062] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt% initiator solution, and the amount of initiator added is 28.6% of the mass of the initiator in step S1;

[0063] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 60 ° C and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating;

[0064] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer.

[0065] The SEM images of the thiol-functionalized core-shell latex particles corresponding to different DTT contents prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in this embodiment are as follows: Figure 1 As shown by Figure 1 It can be seen that PS spherical particles are distributed on the surface of the PVAc core, forming a core-shell structure similar to a "strawberry shape". Comparison shows that the uniformity of the particles and the size of the surface protrusions of the prepared latex particles are similar, indicating that the change in the DTT monomer content does not affect the morphology of the latex particles. This is because the core-shell ratio and AN content are consistent when the PVAc-based core-shell latex particles are prepared at different DTT contents. Under the same preparation process, the small molecule DTT grafted on the shell layer does not cause too much influence on the morphology of the latex particles. Therefore, the core-shell structure of the PVAc-based core-shell latex particles prepared at different DTT contents remains basically consistent.

[0066] The Fourier transform infrared spectra of the thiol functionalized core-shell latex particles corresponding to different DTT contents prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in this embodiment are as follows: Figure 2 As shown, the black spectrum above is the PVAc-based core-shell latex particles, and the red spectrum below is the infrared spectrum of the thiolated PVAc-based core-shell latex particles. Figure 2 It can be seen that both curves are at 1740cm -1 The C=O stretching vibration peak of the ester group appears at 1237 cm -1 and 1026cm -1 The peak that appears at 1375cm-1 is the stretching vibration absorption peak of COC in the ester group. The -CH3 symmetrical deformation vibration absorption peak appears at 2926cm-1. -1 At 3082cm -1 、3060cm -1 、3026cm -1 The stretching vibration absorption peak of CH on the benzene ring skeleton appears at 1602cm -1 、1583cm -1 、1493cm -1 The characteristic peak at 758cm is the bending vibration absorption peak of the C=C double bond on the benzene ring skeleton. -1 、698cm -1The out-of-plane bending vibration absorption peak of CH on the monosubstituted benzene ring skeleton appears at 2242 cm -1 The characteristic absorption peak of the CN triple bond on AN appears at 2300 cm, indicating that the grafted monomer AN exists in the latex particles. In addition, comparing the two curves, the infrared curve of the thiolated emulsion is -1 A distinct characteristic peak appears at , which is the characteristic absorption peak of -SH. A detailed analysis of the various groups in the infrared spectrum of the latex particles revealed the presence of characteristic absorption peaks of VAc, BA, AN, St, and DTT structures in the polymer. The infrared results indicate that, based on the construction of the PVAc core-shell latex particles, thiols were successfully grafted onto the surface of the latex particle shell.

[0067] The DSC curves of the thiol-functionalized core-shell latex particles corresponding to different DTT contents prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating described in this embodiment are as follows: Figure 3 As shown, from Figure 3 It can be seen that two relatively obvious glass transition temperatures appear in the DSC curves corresponding to different DTT contents, namely the glass transition temperature of PVAc (Tg=32°C) and the glass transition temperature of PS (Tg=106°C), indicating that the thiolated core-shell latex particles prepared at different DTT contents all have a phase separation structure.

[0068] The light curing time curve of a fast light curing PVAc based waterborne emulsion wood coating prepared by the method for preparing the fast light curing PVAc based waterborne emulsion wood coating according to the present embodiment corresponding to different DTT contents is as follows: Figure 4 As shown, from Figure 4 It can be seen that when the ratio of active monomer HDDA is 0.5:1, the emulsion fully cures in 60 seconds under UV light (UV wavelength 396nm, irradiation distance 15cm). As the HDDA content increases, the emulsion curing time slightly accelerates when the HDDA content reaches 1:1. When the HDDA content is further increased to 2:1, the curing time accelerates by 48%. Further increasing the HDDA content to 4:1 results in the fastest curing time, requiring only approximately 17 seconds for complete curing. Further increasing the HDDA content actually decreases the curing time, thus confirming that an HDDA content of 3:1 is the optimal active monomer addition.

[0069] The surface coating test of the cured wood blocks was carried out. The film properties of the light-cured PVAc-based water-based emulsion wood coatings prepared with different HDDA addition amounts are shown in Tables 1 and Figure 5 As shown:

[0070] Table 1 Wood coating film properties

[0071]

[0072] It can be seen from Table 1 that with the increase of the active monomer HDDA content, the gloss of the emulsion paint film gradually increases. When the HDDA content is 0.5:1, the gloss of the paint film is 8.7°. As the HDDA addition amount increases, when the HDDA content is 4:1, it reaches a maximum value of 12.9°; when the HDDA content is 0.5:1, the roughness of the light-cured PVAc-based water-based emulsion wood coating film is 4.78μm. With the increase of the active monomer HDDA content, the roughness of the liquid paint film is lower. When the HDDA content is 4:1, the roughness of the paint film reaches a minimum of 2.98μm; when the HDDA content is low, the pencil hardness of the light-cured PVAc-based water-based emulsion wood coating film is small, only 3H. When the HDDA content reaches 3:1, the pencil hardness of the paint film increases to 4H. When the HDDA content is 4:1, the pencil hardness of the paint film remains at a maximum of 4H. Specific implementation method 2:

[0074] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises the following steps:

[0075] S1. Weigh the raw materials based on the total amount of vinyl acetate and styrene to be reacted. The mass ratio of the raw materials is as follows:

[0076] Total deionized water: 125-150%,

[0077] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0078] Shell monomer: 30-50%, the shell monomer is styrene,

[0079] Shell monomer 2: 20-32%, wherein the shell monomer 2 is dipentene,

[0080] Grafting monomer: 1.5-2.5%,

[0081] Emulsifier: 4.5-5.5%,

[0082] Initiator: 0.30~0.40%,

[0083] pH buffer: 0.5-1.5%,

[0084] Thiol monomer: 36.75~110.25%,

[0085] Active monomer: 47.25~335%;

[0086] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is triol dimethacrylate;

[0087] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 125%, core monomer 1 is 60%, shell monomer is 40%, shell monomer 2 is 32%, graft monomer is 2%, emulsifier is 5%, initiator is 0.35%, pH buffer is 1%, thiol monomer is 110.25%, and active monomer is 189%;

[0088] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0089] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6 wt % initiator solution, and the amount of initiator added is 71.4% of the mass of the initiator in step S1;

[0090] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 is stabilized to 80 ° C, and the remaining core monomer 1 is added dropwise. The dropwise acceleration rate of the core monomer 1 is 0.4 to 0.6 ml / min. After 30 minutes of dropwise addition, a certain mass of the second batch of initiator solution is added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions are completed, the grafted monomer is added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer is added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes of dropwise addition, the speed is adjusted to 0.3 ml / min. After the shell monomer is added, the temperature is raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the shell monomer 2 is added dropwise. After the shell monomer 2 is added dropwise, the temperature is kept warm for 30 minutes. After the end of the insulation, the system is heated to 95 ° C and the thiol monomer is added dropwise. When the addition is complete, the temperature is kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0091] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt% initiator solution, and the amount of initiator added is 28.6% of the mass of the initiator in step S1;

[0092] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 60 ° C and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating;

[0093] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer.

[0094] The light curing time curve of a fast light curing PVAc based water-based emulsion wood coating prepared by the method for preparing the fast light curing PVAc based water-based emulsion wood coating according to the present embodiment corresponding to different TMPTA contents is as follows: Figure 6 As shown, from Figure 6 It can be seen that when the TMPTA content is 0.5:1, the emulsion can be completely cured in 57 seconds under ultraviolet light (ultraviolet light wavelength 396nm, irradiation distance 15cm). Subsequently, the TMPTA content is increased to explore the effect of active monomer content on curing time. The light curing rate of the emulsion with a TMPTA content of 1:1 increased by %. The emulsion was completely cured after only 48 seconds. With the increase of active monomer content, when the TMPTA content was 2:1, the curing time was accelerated by 21 seconds. When the TMPTA content was 3:1, the emulsion was completely cured in only 12 seconds. However, when the active monomer content continued to increase to 4:1, the curing time of the emulsion increased, indicating that a TMPTA content of 3:1 is the optimal ratio for the emulsion.

[0095] The surface coating test of the cured wood block was carried out. The performance of the light-cured PVAc-based water-based emulsion wood coating film prepared with different TMPTA addition amounts was as follows: Figure 7 As shown in Table 2:

[0096] Table 2 Wood coating film properties

[0097]

[0098] It can be seen from Table 2 that with the increase of the active monomer TMPTA content, the gloss of the light-cured PVAc-based water-based emulsion paint film gradually increases. When the TMPTA content is 0.5:1, the gloss of the paint film is 8.5°. As the TMPTA addition amount increases to 1:1, the gloss of the paint film increases significantly to 11.7. With further increase in TMPTA content, the gloss continues to increase, but the increase rate slows down. When the TMPTA content is 4:1, it reaches a maximum of 12.3°; when the TMPTA content is 0.5:1, the roughness of the paint film is 4.67μm As the TMPTA addition amount increases to 1:1, the roughness of the paint film decreases to 3.82μm. As the content of active monomer TMPTA continues to increase, the roughness of the liquid paint film becomes lower. When the TMPTA content is 4:1, the roughness of the paint film reaches the minimum value of 2.36μm. When the TMPTA content is low, the pencil hardness of the light-cured PVAc-based water-based emulsion wood coating film is small, only 3H. When the TMPTA content reaches 2:1, the pencil hardness of the paint film increases to 4H. As the TMPTA content continues to increase, the pencil hardness of the paint film remains at a maximum value of 4H. Specific implementation method three:

[0100] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises the following steps:

[0101] S1. Weigh the raw materials based on the total amount of vinyl acetate and styrene to be reacted. The mass ratio of the raw materials is as follows:

[0102] Total deionized water: 125-150%,

[0103] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0104] Shell monomer: 30-50%, the shell monomer is styrene,

[0105] Shell monomer 2: 20-32%, wherein the shell monomer 2 is dipentene,

[0106] Grafting monomer: 1.5-2.5%,

[0107] Emulsifier: 4.5-5.5%,

[0108] Initiator: 0.30~0.40%,

[0109] pH buffer: 0.5-1.5%,

[0110] Thiol monomer: 36.75~110.25%,

[0111] Active monomer: 47.25~335%;

[0112] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is hexanediol diacrylate;

[0113] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 130%, core monomer 1 is 50%, shell monomer is 50%, shell monomer 2 is 32%, graft monomer is 1.5%, emulsifier is 4.5%, initiator is 0.3%, pH buffer is 0.5%, thiol monomer is 110.25%, and active monomer is 189%;

[0114] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0115] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6 wt % initiator solution, and the amount of initiator added is 71.4% of the mass of the initiator in step S1;

[0116] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 was stabilized to 80 ° C, and the remaining core monomer 1 was added dropwise. The dropwise acceleration rate of the core monomer 1 was 0.4 to 0.6 ml / min. After 30 minutes of addition, a certain mass of the second batch of initiator solution was added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions were completed, the grafted monomer was added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer was added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes, the speed was adjusted to 0.3 ml / min. After the shell monomer was added, the temperature was raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the core monomer 2 was added dropwise. After the addition of the core monomer 2 was completed, the temperature was kept warm for 30 minutes. After the end of the insulation, the system was heated to 95 ° C and the thiol monomer was added dropwise. When the addition was completed, the temperature was kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0117] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt% initiator solution, and the amount of initiator added is 28.6% of the mass of the initiator in step S1;

[0118] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 60 ° C and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating;

[0119] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer. Specific implementation method four:

[0121] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises weighing raw materials, comprising the following steps:

[0122] S1. Based on the total amount of vinyl acetate and styrene reacted, the mass ratio of the raw materials is as follows:

[0123] Total deionized water: 125-150%,

[0124] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0125] Shell monomer: 30-50%, the shell monomer is styrene,

[0126] Shell monomer 2: 20-32%, the core monomer 2 is dipentene,

[0127] Grafting monomer: 1.5-2.5%,

[0128] Emulsifier: 4.5-5.5%,

[0129] Initiator: 0.30~0.40%,

[0130] pH buffer: 0.5-1.5%,

[0131] Thiol monomer: 36.75~110.25%,

[0132] Active monomer: 47.25~335%;

[0133] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is hexanediol diacrylate;

[0134] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 130%, core monomer 1 is 70%, shell monomer is 30%, shell monomer 2 is 32%, graft monomer is 2.5%, emulsifier is 5.5%, initiator is 0.4%, pH buffer is 1.5%, thiol monomer is 110.25, and active monomer is 189;

[0135] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0136] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6 wt % initiator solution, and the amount of initiator added is 71.4% of the mass of the initiator in step S1;

[0137] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 was stabilized to 80 ° C, and the remaining core monomer 1 was added dropwise. The dropwise acceleration rate of the core monomer 1 was 0.4 to 0.6 ml / min. After 30 minutes of addition, a certain mass of the second batch of initiator solution was added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions were completed, the grafted monomer was added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer was added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes, the speed was adjusted to 0.3 ml / min. After the shell monomer was added, the temperature was raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the core monomer 2 was added dropwise. After the addition of the core monomer 2 was completed, the temperature was kept warm for 30 minutes. After the end of the insulation, the system was heated to 95 ° C and the thiol monomer was added dropwise. When the addition was completed, the temperature was kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0138] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt% initiator solution, and the amount of initiator added is 28.6% of the mass of the initiator in step S1;

[0139] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 60 ° C and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating;

[0140] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer. Specific implementation method five:

[0142] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises weighing raw materials, comprising the following steps:

[0143] S1. Based on the total amount of vinyl acetate and styrene reacted, the mass ratio of the raw materials is as follows:

[0144] Total deionized water: 125-150%,

[0145] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0146] Shell monomer: 30-50%, the shell monomer is styrene,

[0147] Shell monomer 2: 20-32%, the core monomer 2 is dipentene,

[0148] Grafting monomer: 1.5-2.5%,

[0149] Emulsifier: 4.5-5.5%,

[0150] Initiator: 0.30~0.40%,

[0151] pH buffer: 0.5-1.5%,

[0152] Thiol monomer: 36.75~110.25%,

[0153] Active monomer: 47.25~335%;

[0154] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is triol dimethacrylate;

[0155] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 140%, core monomer 1 is 65%, shell monomer is 35%, shell monomer 2 is 32%, graft monomer is 2.5%, emulsifier is 5.5%, initiator is 0.4%, pH buffer is 1.5%, thiol monomer is 110.25%, and active monomer is 189%;

[0156] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0157] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6 wt % initiator solution, and the amount of initiator added is 71.4% of the mass of the initiator in step S1;

[0158] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 was stabilized to 80 ° C, and the remaining core monomer 1 was added dropwise. The dropwise acceleration rate of the core monomer 1 was 0.4 to 0.6 ml / min. After 30 minutes of addition, a certain mass of the second batch of initiator solution was added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions were completed, the grafted monomer was added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer was added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes, the speed was adjusted to 0.3 ml / min. After the shell monomer was added, the temperature was raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the core monomer 2 was added dropwise. After the addition of the core monomer 2 was completed, the temperature was kept warm for 30 minutes. After the end of the insulation, the system was heated to 95 ° C and the thiol monomer was added dropwise. When the addition was completed, the temperature was kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0159] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt% initiator solution, and the amount of initiator added is 28.6% of the mass of the initiator in step S1;

[0160] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 60 ° C and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating;

[0161] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer. Specific implementation method six:

[0163] A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating comprises weighing raw materials, comprising the following steps:

[0164] S1. Based on the total amount of vinyl acetate and styrene reacted, the mass ratio of the raw materials is as follows:

[0165] Total deionized water: 125-150%,

[0166] Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate,

[0167] Shell monomer: 30-50%, the shell monomer is styrene,

[0168] Shell monomer 2: 20-32%, the core monomer 2 is dipentene,

[0169] Grafting monomer: 1.5-2.5%,

[0170] Emulsifier: 4.5-5.5%,

[0171] Initiator: 0.30~0.40%,

[0172] pH buffer: 0.5-1.5%,

[0173] Thiol monomer: 36.75~110.25%,

[0174] Active monomer: 47.25~335%;

[0175] Furthermore, in step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, the thiol monomer is dithiothreitol, and the active monomer is triol dimethacrylate;

[0176] Furthermore, the mass ratio of the raw materials in step S1 is as follows: deionized water is 150%, core monomer 1 is 55%, shell monomer is 45%, shell monomer 2 is 32%, graft monomer is 2.2%, emulsifier is 5.1%, initiator is 0.33%, pH buffer is 1.2%, thiol monomer is 110.25%, and active monomer is 189%;

[0177] S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and the pH buffer were mixed uniformly in a four-necked flask, pre-emulsified in a water bath at 60°C and a stirring rate of 250 r / min for 30 min, then a certain amount of core layer monomer 1 was added, stirred and emulsified for 30 min, and then a certain amount of initiator solution was added. The temperature was raised to 65°C. After the solution turned slightly emulsified blue and the reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion;

[0178] Furthermore, the mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6 wt % initiator solution, and the amount of initiator added is 71.4% of the mass of the initiator in step S1;

[0179] S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 was stabilized to 80 ° C, and the remaining core monomer 1 was added dropwise. The dropwise acceleration rate of the core monomer 1 was 0.4 to 0.6 ml / min. After 30 minutes of addition, a certain mass of the second batch of initiator solution was added at a dropwise acceleration rate of 0.1 to 0.2 ml / min. After all the additions were completed, the grafted monomer was added dropwise at a rate of 1 ml / min. Immediately after the addition of the grafted monomer, the shell monomer was added dropwise at a rate of 0.8 ml / min. After 2 to 4 minutes, the speed was adjusted to 0.3 ml / min. After the shell monomer was added, the temperature was raised to 85 ° C and kept warm for 30 minutes; after the end of the insulation, the core monomer 2 was added dropwise. After the addition of the core monomer 2 was completed, the temperature was kept warm for 30 minutes. After the end of the insulation, the system was heated to 95 ° C and the thiol monomer was added dropwise. When the addition was completed, the temperature was kept warm for 30 minutes to obtain thiol-functionalized core-shell latex particles.

[0180] Furthermore, the second batch of initiator solution added in step S3 is a 0.64 wt% initiator solution, and the amount of initiator added is 28.6% of the mass of the initiator in step S1;

[0181] S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 60 ° C and the pre-emulsified active monomer was added dropwise at a rate of 0.5 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating;

[0182] Furthermore, the pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer.

[0183] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0184] Although the present application has been described above with reference to specific embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed herein may be combined with each other in any manner, and the omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A method for preparing a fast light-curing PVAc-based water-based emulsion wood coating, characterized in that: The steps include: S1. Weigh the raw materials based on the total amount of vinyl acetate and styrene to be reacted. The raw material mass ratio is as follows: Total deionized water: 125~150%, Core layer monomer 1: 50-70%, wherein the core layer monomer 1 is vinyl acetate, Shell monomer: 30-50%, the shell monomer is styrene, Shell monomer 2: 20-32%, wherein the shell monomer 2 is dipentene, Grafting monomer: 1.5~2.5%, Emulsifier: 4.5~5.5%, Initiator: 0.30~0.40%, pH buffer: 0.5~1.5%, Thiol monomer: 36.75~110.25%, Active monomer: 47.25~335%; S2. Preparation of a nuclear seed emulsion: A certain amount of deionized water, the emulsifier weighed in step S1, and a pH buffer were mixed uniformly in a four-necked flask and pre-emulsified in a water bath at 60°C with a stirring rate of 250 r / min for 30 min. A certain amount of core layer monomer 1 was then added and stirred and emulsified for 30 min. Then, a certain amount of initiator solution was added and the temperature was raised to 65°C. After the solution turned slightly emulsified blue and reflux on the condenser disappeared, the temperature was raised to 80°C to prepare a nuclear seed emulsion. S3. Preparation of thiol-functionalized core-shell latex particles: The reaction temperature of the core seed emulsion obtained in step S2 is stabilized to 80°C, and the remaining core monomer 1 is added dropwise at a rate of 0.4~0.6 ml / min. After 30 minutes of addition, a certain mass of the second batch of initiator solution is added at a rate of 0.1~0.2 ml / min. After all the additions are completed, the graft monomer is added dropwise at a rate of 1 ml / min. After the graft monomer is added, the shell monomer is immediately added dropwise at a rate of 0.8 ml / min. After 2~4 minutes of addition, the speed is adjusted to 0.3 ml / min. After the shell monomer is added, the temperature is raised to 85°C and kept warm for 10~60 minutes; after the end of the insulation, the shell monomer 2 is added dropwise. After the shell monomer 2 is added dropwise, the temperature is kept warm for 10~60 minutes. After the end of the insulation, the system is heated to 90~100°C and the temperature is increased at 0.05~1 Thiol monomer was added dropwise at a rate of ml / min, and after the addition was completed, the temperature was kept at 10 to 60 minutes to prepare thiol-functionalized core-shell latex particles. S4. Preparation of a fast light-curing PVAc-based water-based emulsion wood coating: The thiol-functionalized core-shell latex particles obtained in step S3 were cooled to 45-70 ° C, and the pre-emulsified active monomer was added dropwise at a rate of 0.1-1 ml / min to obtain a fast light-curing PVAc-based water-based emulsion wood coating; The thiol monomer is dithiothreitol.

2. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 1, characterized in that: In step S1, the grafting monomer is acrylonitrile, the emulsifier is a mixture of PCA507 and PCA078 in a mass ratio of 1:1, the initiator is ammonium persulfate, the pH buffer is NaHCO3, and the active monomer is hexanediol diacrylate or triol dimethacrylate.

3. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 2, characterized in that: The mass ratio of the raw materials in step S1 is as follows: deionized water is 125%, core monomer 1 is 50%, shell monomer is 50%, shell monomer 2 is 32%, graft monomer is 1.5%, emulsifier is 5%, initiator is 0.3%, pH buffer is 0.5%, thiol monomer is 36.75%, and active monomer is 47.25%.

4. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 3, characterized in that: The mass ratio of the raw materials in step S1 is as follows: deionized water is 130%, core monomer 1 is 70%, shell monomer is 30%, shell monomer 2 is 32%, graft monomer is 2.5%, emulsifier is 5%, initiator is 0.4%, pH buffer is 1.5%, thiol monomer is 73.5%, and active monomer is 94.5%.

5. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 4, characterized in that: The mass ratio of the raw materials in step S1 is as follows: deionized water is 125%, core monomer 1 is 60%, shell monomer is 40%, shell monomer 2 is 32%, graft monomer is 2%, emulsifier is 5%, initiator is 0.35%, pH buffer is 1%, thiol monomer is 110.25%, and active monomer is 189%.

6. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 5, characterized in that: The mass ratio of deionized water in step S2 to the total deionized water in step S1 is 0.4-0.6:1, the amount of core layer monomer 1 added is 16-18% of the mass of the core layer monomer 1 in step S1, the added initiator solution is a 2.6wt% initiator solution, and the amount of initiator added is 70-72% of the mass of the initiator in step S1.

7. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 6, characterized in that: The second batch of initiator solution added in step S3 is a 0.64 wt % initiator solution, and the amount of initiator added is 28-30% of the mass of the initiator in step S1.

8. The method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to claim 7, characterized in that: The pre-emulsification method of the active monomer in step S4 is to mix the active monomer and water in a ratio of 7:3, add 1% of the total mass of emulsifier OP-10, and emulsify with a homogenizer.

9. A fast light-curing PVAc-based water-based emulsion wood coating prepared by the method for preparing a fast light-curing PVAc-based water-based emulsion wood coating according to any one of claims 1 to 8, characterized in that: The curing time of the fast light-curing PVAc-based water-based emulsion wood coating is 12 to 20 seconds.

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