Preparation process of quick-drying polyurethane furniture paint curing agent

Abstract

The invention relates to the field of furniture paint curing agents, and discloses a preparation process of a quick-drying polyurethane furniture paint curing agent which comprises the following components in parts by weight: 30-50 parts of polyether polyol, 15-30 parts of acrylate monomer, 15-25 parts of isocyanate, 1-5 parts of a photoinitiator, 0.5-3 parts of a catalyst, 1-5 parts of a flatting agent, 1-5 parts of a toughening agent, 0.5-2 parts of an anti-ultraviolet agent, 0.1-1 part of a preservative, 5-8 parts of a solvent and 0.1-2 parts of a thickening agent. A firm three-dimensional cross-linked network can be formed through reaction of polyether polyol and isocyanate, cross-linking is formed in the photopolymerization process of acrylate, when the curing agent is mixed with the polyurethane furniture paint, a more complex cross-linked network can be formed in a coating, the drying speed of the polyurethane furniture paint is further increased, and the curing agent has the advantages of being high in curing speed and good in curing effect. And the paint film can reach the required hardness and stability in a short time.

Description

Technical Field

[0001] The invention relates to the field of furniture paint curing agents, in particular to a preparation process of a quick-drying polyurethane furniture paint curing agent. Background Art

[0002] Furniture paint is a key material used for furniture surface coating. It not only beautifies the appearance of furniture, but also protects the wood from damage by environmental factors such as moisture and ultraviolet rays. High-quality furniture paint can give the furniture surface high gloss, wear resistance and stain resistance, thereby extending the service life of the furniture and enhancing its decorative effect.

[0003] Among the many types of furniture paints, polyurethane furniture paint is widely used due to its excellent adhesion, wear resistance, chemical resistance and flexibility. The excellent performance of polyurethane furniture paint mainly comes from the cross-linked structure formed during its curing reaction, so curing agents are usually added during the construction process. Curing agents can promote the cross-linking reaction of polyurethane paint, make the paint film dry faster, and improve the hardness and durability of the paint film.

[0004] However, the existing polyurethane furniture paint curing system mainly relies on the cross-linking reaction between polyether polyol and isocyanate, which has a slow curing speed at room temperature, resulting in a long drying time and low construction efficiency. In addition, this single cross-linking structure is relatively simple, resulting in insufficient wear resistance and weather resistance of the coating, and the coating film is prone to aging and yellowing under ultraviolet light, which limits its use outdoors and in high ultraviolet light environments. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a preparation process of a quick-drying polyurethane furniture paint curing agent, which solves the problems in the prior art that the existing polyurethane furniture paint mainly relies on a single cross-linking reaction, resulting in slow curing speed, long drying time and low construction efficiency, as well as easy aging and yellowing.

[0006] To achieve the above purpose, the present invention is implemented by the following technical scheme: a quick-drying polyurethane furniture paint curing agent comprises the following components in parts by weight:

[0007] Polyether polyol: 30-50 parts

[0008] Acrylate monomer: 15-30 parts

[0009] Isocyanate: 15-25 parts

[0010] Photoinitiator: 1-5 parts

[0011] Catalyst: 0.5-3 parts

[0012] Leveling agent: 1 to 5 parts

[0013] Toughening agent: 1-5 parts

[0014] Anti-ultraviolet agent: 0.5-2 parts

[0015] Preservatives: 0.1-1 parts

[0016] Solvent: 5-8 parts

[0017] Thickener: 0.1 to 2 parts.

[0018] Preferably, the photoinitiator is benzophenone, the catalyst is dimethylacetamide, and the leveling agent is a polyether leveling agent.

[0019] Preferably, the toughening agent is polyvinyl alcohol, and the anti-ultraviolet agent is triphenylmethane.

[0020] Preferably, the preservative is isothiazolinone, the solvent is 70% to 85% ethanol solution, and the thickener is polyacrylic acid.

[0021] The preparation process of the quick-drying polyurethane furniture paint curing agent comprises the following steps:

[0022] S1. Prepare the required raw materials, including polyether polyol, acrylate monomer, isocyanate, photoinitiator, catalyst, leveling agent, toughening agent, UV inhibitor, preservative, solvent and thickener;

[0023] S2, adding polyether polyol and acrylate monomer into a container, and then stirring to mix the two uniformly;

[0024] S3, then slowly add isocyanate into the container and continue stirring to allow it to completely dissolve and react;

[0025] S4, add photoinitiator, catalyst, leveling agent, toughening agent, UV inhibitor, preservative and thickener into the container, and continue stirring until the mixture is uniform;

[0026] S5, adding anti-ultraviolet agent, preservative and thickener to the container, and continuing to stir until the mixture is uniform;

[0027] S6, transferring the mixture into a reactor, and heating the reactor to accelerate the reaction;

[0028] S7, after the reaction is completed, the reaction product is cooled to room temperature;

[0029] S8. Use a filtering device to filter the cooled mixture to remove unreacted substances and impurities, and finally obtain a quick-drying polyurethane furniture paint curing agent.

[0030] Preferably, in S2, the container uses a high shear agitator, the stirring speed is 3000-3500 RPM, and the stirring time is 10-15 min.

[0031] Preferably, in S3, the stirring speed of the high shear agitator is 3000-3500 RPM, and the stirring time is 5-10 min.

[0032] Preferably, in S4, the stirring speed of the high shear agitator is 4000-4500 RPM, and the stirring time is 5-10 min. In S5, the stirring speed of the high shear agitator is 4000-4800 RPM, and the stirring time is 10-13 min.

[0033] Preferably, in S6, the reactor is heated to 60-80°C and maintained for 2-4 hours, and in S8, the filtering device uses a stainless steel filter with a filtration pore size of 1-5 um.

[0034] Preferably, the curing agent finally obtained in S8, when used, has a mixing ratio of 1.0-1.5:4-6 with the polyurethane furniture paint.

[0035] The present invention provides a preparation process of a quick-drying polyurethane furniture paint curing agent. It has the following beneficial effects:

[0036] 1. The present invention can form a strong three-dimensional cross-linked network through the reaction of polyether polyol and isocyanate, and the photopolymerization process of acrylate also forms cross-links. When the curing agent is mixed with polyurethane furniture paint, the cross-linking reaction of polyether polyol and isocyanate interacts with the photopolymerization of acrylate, which will promote the formation of a more complex cross-linked network in the coating, thereby accelerating the drying speed of the polyurethane furniture paint and ensuring that the paint film reaches the required hardness and stability in a short time.

[0037] 2. The present invention introduces polyvinyl alcohol toughening agent and triphenylmethane UV inhibitor, so that the final paint film of the curing agent can show good toughness and UV resistance, thereby improving the wear resistance and weather resistance of the coating and extending the service life of the furniture.

[0038] 3. The present invention can significantly improve the fluidity and coating performance of the curing agent by introducing a polyether leveling agent and a polyacrylic acid thickener. The addition of the leveling agent can effectively reduce the defects on the coating surface and make the paint film smoother, while the thickener can adjust the viscosity of the coating and ensure the stability during the coating process, thereby improving the uniformity and appearance quality of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Please see attached Figure 1 The embodiment of the present invention provides a quick-drying polyurethane furniture paint curing agent, which includes the following components in parts by weight: polyether polyol: 30-50 parts, acrylate monomer: 15-30 parts, isocyanate: 15-25 parts, photoinitiator: 1-5 parts, catalyst: 0.5-3 parts, leveling agent: 1-5 parts, toughening agent: 1-5 parts, anti-ultraviolet agent: 0.5-2 parts, preservative: 0.1-1 parts, solvent: 5-8 parts, thickener: 0.1-2 parts.

[0042] The photoinitiator is benzophenone, the catalyst is dimethylacetamide, and the leveling agent is a polyether leveling agent.

[0043] The toughening agent is polyvinyl alcohol and the UV-resistant agent is triphenylmethane.

[0044] The preservative is isothiazolinone, the solvent is 70% to 85% ethanol solution, and the thickener is polyacrylic acid.

[0045] The preparation process of the above-mentioned curing agent comprises the following steps:

[0046] S1. Prepare the required raw materials, including polyether polyol, acrylate monomer, isocyanate, photoinitiator, catalyst, leveling agent, toughening agent, UV inhibitor, preservative, solvent and thickener;

[0047] S2, adding polyether polyol and acrylate monomer into a container, and then stirring to mix the two uniformly;

[0048] S3, then slowly add isocyanate into the container and continue stirring to allow it to completely dissolve and react;

[0049] S4, add photoinitiator, catalyst, leveling agent, toughening agent, UV inhibitor, preservative and thickener into the container, and continue stirring until the mixture is uniform;

[0050] S5, adding anti-ultraviolet agent, preservative and thickener to the container, and continuing to stir until the mixture is uniform;

[0051] S6, transferring the mixture into a reactor, and heating the reactor to accelerate the reaction;

[0052] S7, after the reaction is completed, the reaction product is cooled to room temperature;

[0053] S8. Use a filtering device to filter the cooled mixture to remove unreacted substances and impurities, and finally obtain a quick-drying polyurethane furniture paint curing agent.

[0054] In S2, the container uses a high shear agitator, the stirring speed is 3000-3500 RPM, and the stirring time is 10-15 minutes.

[0055] In S3, the stirring speed of the high shear stirrer is 3000-3500 RPM, and the stirring time is 5-10 min.

[0056] In S4, the stirring speed of the high shear agitator is 4000-4500 RPM, and the stirring time is 5-10 min. In S5, the stirring speed of the high shear agitator is 4000-4800 RPM, and the stirring time is 10-13 min.

[0057] In S6, the reactor is heated to 60-80°C and maintained for 2-4 hours. In S8, a stainless steel filter is used as the filtering device, and the filter pore size is 1-5 um.

[0058] The curing agent finally obtained in S8, when used, has a mixing ratio of 1.0-1.5:4-6 with the polyurethane furniture paint.

[0059] Example 1: Standard quick-drying formula

[0060] Recipe composition:

[0061] Polyether polyol: 40 parts

[0062] Acrylate monomer: 20 parts

[0063] Isocyanate: 20 parts

[0064] Photoinitiator (benzophenone): 3 parts

[0065] Catalyst (triethanolamine): 1 part

[0066] Leveling agent (polyether leveling agent): 2 parts

[0067] Toughening agent (polyvinyl alcohol): 1 part

[0068] Anti-ultraviolet agent (triphenylmethane): 1 part

[0069] Preservative (sodium benzoate): 0.5 parts

[0070] Solvent (ethanol): 4 parts

[0071] Thickener (polyacrylic acid): 0.5 parts

[0072] step:

[0073] The polyether polyol and acrylate monomers were mixed and stirred for 10 minutes (3000 RPM).

[0074] Slowly add the isocyanate and stir for 5 minutes (3500 RPM).

[0075] The photoinitiator, catalyst and other ingredients were added in sequence and stirred for 10 minutes (4500RPM).

[0076] The mixture was transferred to a reactor and heated to 70°C for 3 hours.

[0077] The mixture was cooled to room temperature and filtered with a pore size of 2 microns.

[0078] Summary: This formula has standard quick-drying effect and comprehensive coating performance. It is suitable for rapid coating of furniture paint, with short curing time and uniform coating.

[0079] Example 2: Enhanced Weathering Resistance Formulation

[0080] Recipe composition:

[0081] Polyether polyol: 35 parts

[0082] Acrylate monomer: 20 parts

[0083] Isocyanate: 25 parts

[0084] Photoinitiator (benzophenone): 3 parts

[0085] Catalyst (triethanolamine): 1.5 parts

[0086] Leveling agent (polyether leveling agent): 3 parts

[0087] Toughening agent (polyvinyl alcohol): 2 parts

[0088] Anti-ultraviolet agent (triphenylmethane): 1.5 parts

[0089] Preservative (isothiazolinone): 0.8 parts

[0090] Solvent (ethanol): 4.5 parts

[0091] Thickener (polyacrylic acid): 0.8 parts

[0092] step:

[0093] The polyether polyol and acrylate monomers were mixed and stirred for 15 minutes (3200 RPM).

[0094] The isocyanate was added slowly and stirred for 8 minutes (3600 RPM).

[0095] Add photoinitiator, catalyst and other ingredients and stir for 15 minutes (4600 RPM).

[0096] Heat to 65°C and maintain for 3 hours, cool and filter, the filter pore size is 3 microns.

[0097] Summary: This formula significantly enhances the weather resistance of the coating by adding UV stabilizers and toughening agents, making it suitable for outdoor furniture or environments exposed to UV rays.

[0098] Example 3: Fast Curing Formulation

[0099] Recipe composition:

[0100] Polyether polyol: 45 parts

[0101] Acrylate monomer: 15 parts

[0102] Isocyanate: 15 parts

[0103] Photoinitiator (benzophenone): 4 parts

[0104] Catalyst (dimethylacetamide): 2 parts

[0105] Leveling agent (polyether leveling agent): 2 parts

[0106] Toughener (polyvinyl alcohol): 1.5 parts

[0107] Anti-ultraviolet agent (triphenylmethane): 1 part

[0108] Preservative (sodium benzoate): 0.5 parts

[0109] Solvent (ethanol): 3.5 parts

[0110] Thickener (polyacrylic acid): 0.5 parts

[0111] step:

[0112] The polyether polyol and acrylate monomers were mixed and stirred for 8 minutes (3000 RPM).

[0113] Add isocyanate and stir for 4 minutes (3400 RPM).

[0114] Add photoinitiator, catalyst and other ingredients and stir for 8 minutes (4300RPM).

[0115] Heat to 75°C and maintain for 2.5 hours, cool and filter with a pore size of 1 micron.

[0116] Summary: This formula is suitable for situations where extremely fast curing is required. It can dry in a shorter time to meet the needs of fast construction.

[0117] Example 4: High Strength Formula

[0118] Recipe composition:

[0119] Polyether polyol: 38 parts

[0120] Acrylate monomer: 25 parts

[0121] Isocyanate: 17 parts

[0122] Photoinitiator (benzophenone): 3.5 parts

[0123] Catalyst (triethanolamine): 1.8 parts

[0124] Leveling agent (polyether leveling agent): 2 parts

[0125] Toughening agent (polyvinyl alcohol): 2 parts

[0126] Anti-ultraviolet agent (triphenylmethane): 1.2 parts

[0127] Preservative (sodium benzoate): 0.6 parts

[0128] Solvent (ethanol): 5.5 parts

[0129] Thickener (polyacrylic acid): 0.7 parts

[0130] step:

[0131] Mix polyether polyol and acrylate monomer according to the proportion and stir for 15 minutes (3100RPM). Slowly add isocyanate and stir for 6 minutes (3500RPM).

[0132] Add photoinitiator and other ingredients and stir for 12 minutes (4400 RPM).

[0133] Heat to 70℃ and maintain for 3.5 hours, cool and filter, the filtration pore size is 2.5 microns. Summary: This formula enhances the mechanical strength of the coating and is suitable for furniture surfaces with high strength requirements.

[0134] Example 5: Low VOC Environmentally Friendly Formula

[0135] Recipe composition:

[0136] Polyether polyol: 40 parts

[0137] Acrylate monomer: 18 parts

[0138] Isocyanate: 18 parts

[0139] Photoinitiator (benzophenone): 2.5 parts

[0140] Catalyst (triethanolamine): 1.2 parts

[0141] Leveling agent (polyether leveling agent): 1.5 parts

[0142] Toughening agent (polyvinyl alcohol): 1.2 parts

[0143] Anti-ultraviolet agent (triphenylmethane): 1 part

[0144] Preservative (sodium benzoate): 0.3 parts

[0145] Solvent (mixture of water and a small amount of ethanol): 3 parts

[0146] Thickener (polyacrylic acid): 0.5 parts

[0147] step:

[0148] The polyether polyol was mixed with the acrylate monomer and stirred for 12 minutes (3000 RPM).

[0149] Add isocyanate and stir for 6 minutes (3400 RPM).

[0150] The photoinitiator, catalyst and other ingredients were added in sequence and stirred for 10 minutes (4500RPM).

[0151] Heat to 65°C and maintain for 3 hours, cool and filter with a pore size of 1 micron.

[0152] Summary: By reducing the ethanol content, this formula reduces VOCs emissions and is suitable for occasions with high environmental protection requirements.

[0153] Summary

[0154] The above five embodiments provide optimization solutions for different scenarios, including quick drying effect, weather resistance, low VOC emission, etc. Each embodiment not only ensures quick drying effect, but also takes into account different practical application requirements, demonstrating the diversified application value of the invention.

[0155] Test experimental data and analysis

[0156] Test items

[0157] Cure time: The time from application to complete drying is measured in minutes.

[0158] Paint film hardness: The hardness is measured using the pencil hardness test method and is expressed as HB, F, H, 2H, etc.

[0159] Weathering: Changes in the coating are measured after 500 hours of UV aging and the results are expressed as a percentage of residual strength.

[0160] VOCs emissions: The amount of volatile organic compounds released by the coating during the drying process is measured by a VOCs analyzer (unit: g / L).

[0161] Adhesion: The coating adhesion is measured using the 100-grid test method, and the results are expressed on a scale of 1-5, with 1 being the highest adhesion.

[0162] Test data comparison table

[0163]

[0164] Summary of each embodiment

[0165] Example 1 (standard quick-drying formula):

[0166] Curing time: medium, suitable for conventional furniture paint construction.

[0167] Paint film hardness: reaches H, with moderate hardness and good adhesion.

[0168] Weather resistance: Good aging resistance, suitable for general indoor applications.

[0169] VOCs emissions: controlled at 48g / L, meeting general environmental protection requirements.

[0170] Embodiment 2 (enhanced weather resistance formula):

[0171] Curing time: slightly longer, but improved weather resistance, highest strength retention after UV aging (92%).

[0172] Paint film hardness: up to 2H, the surface is more wear-resistant and suitable for outdoor use.

[0173] VOCs emissions: slightly higher than the standard formula, but still within the environmental protection standards.

[0174] Example 3 (fast curing formula):

[0175] Curing time: The fastest, only 28 minutes, suitable for fast construction needs.

[0176] Film hardness: F, slightly lower than other formulations, but acceptable.

[0177] Weather resistance: Moderate, suitable for indoor rapid construction environment.

[0178] VOCs emissions: slightly higher, but can meet short-term rapid construction needs.

[0179] Embodiment 4 (high strength formula):

[0180] Curing time: Longest, but with higher film hardness (2H).

[0181] Weather resistance: Good durability (90%), suitable for applications subject to higher friction.

[0182] VOCs emissions: controlled at 47g / L, suitable for furniture surfaces with special requirements for strength.

[0183] Example 5 (low VOC environmentally friendly formula):

[0184] Cure Time: Slightly longer than the fast formula, but still short.

[0185] VOCs emissions: Lowest (30g / L), suitable for environments with high environmental protection requirements.

[0186] Paint film hardness: reaches HB, sufficient adhesion (grade 1), suitable for indoor environmentally friendly coatings.

[0187] Summary

[0188] Curing time: It can be flexibly adjusted in different embodiments, and the shortest curing time is 28 minutes, which is suitable for fast construction.

[0189] Paint film hardness: varies from HB to 2H according to demand to meet different hardness requirements.

[0190] Weather resistance: The maximum retention rate is up to 92%, meeting the needs of outdoor use.

[0191] VOCs emissions: The lowest is 30g / L, which is significantly better than traditional products and is especially suitable for applications with high environmental protection requirements.

[0192] Test data table and specific parameters

[0193] The table clearly shows the performance of different parameters in each embodiment, further highlighting the advantages of the present invention, especially the significant advantages in curing time control, weather resistance improvement and VOCs emission reduction.

[0194] Comparative Experimental Design

[0195] Five groups of experiments were designed to test the combined effects of the cross-linking reaction of polyether polyols and isocyanates in different formulations and the photopolymerization of acrylates, focusing on the curing time, film hardness, cross-linking density, drying rate, UV resistance and adhesion.

[0196] Experimental formula and content

[0197] Experiment 1: Basic formulation (no acrylate, no photoinitiator)

[0198] Recipe composition:

[0199] Polyether polyol: 50 parts

[0200] Isocyanate: 25 parts

[0201] Catalyst: 1.5 parts

[0202] Leveling agent: 2 parts

[0203] Solvent: 6 parts

[0204] Thickener: 0.5 parts

[0205] Purpose: To test the properties of coatings that rely solely on the crosslinking reaction of polyether polyols and isocyanates as a control group.

[0206] Experiment 2: Introduction of acrylate (without photoinitiator)

[0207] Recipe composition:

[0208] Polyether polyol: 45 parts

[0209] Isocyanate: 20 parts

[0210] Acrylate monomer: 15 parts

[0211] Catalyst: 1.2 parts

[0212] Leveling agent: 2 parts

[0213] Solvent: 5 parts

[0214] Thickener: 0.4 parts

[0215] Purpose: To introduce acrylate into the traditional cross-linking reaction and observe whether it can improve the density and drying speed of the cross-linking network.

[0216] Experiment 3: Inventive formula (acrylate + photoinitiator)

[0217] Recipe composition:

[0218] Polyether polyol: 40 parts

[0219] Isocyanate: 20 parts

[0220] Acrylate monomer: 20 parts

[0221] Photoinitiator (benzophenone): 3 parts

[0222] Catalyst: 1.5 parts

[0223] Leveling agent: 2 parts

[0224] Solvent: 5 parts

[0225] Thickener: 0.5 parts

[0226] Purpose: To test the combined effect of crosslinking reaction of polyether polyols with isocyanates and photopolymerization of acrylates and verify the improvement of drying rate and coating properties by photopolymerization.

[0227] Experiment 4: High Acrylate Content Formulation

[0228] Recipe composition:

[0229] Polyether polyol: 35 parts

[0230] Isocyanate: 15 parts

[0231] Acrylate monomer: 30 parts

[0232] Photoinitiator (benzophenone): 4 parts

[0233] Catalyst: 1.5 parts

[0234] Leveling agent: 2 parts

[0235] Solvent: 5 parts

[0236] Thickener: 0.5 parts

[0237] Objective: To further increase the acrylate content to maximize the effect of photopolymerization and observe the effect on drying rate and coating hardness.

[0238] Experiment 5: Improved version of traditional formula (no acrylate, added catalyst)

[0239] Recipe composition:

[0240] Polyether polyol: 50 parts

[0241] Isocyanate: 25 parts

[0242] Catalyst: 2 parts

[0243] Leveling agent: 2 parts

[0244] Solvent: 6 parts

[0245] Thickener: 0.5 parts

[0246] Objective: To accelerate the cross-linking reaction of polyether polyol and isocyanate by adding catalyst and compare the effect of simple cross-linking reaction on improving drying speed.

[0247] Description of the experimental process

[0248] 1. Curing time test

[0249] Each formulation was coated on a test plate (thickness 100 μm), and the time from coating to complete drying (surface drying and through drying time) was measured at 25° C. and 50% humidity. The through drying time was taken as the curing time.

[0250] 2. Paint film hardness test

[0251] Use a pencil hardness tester to test the hardness of the dried coating and determine the highest hardness pencil level without scratches. Test three times and take the average value.

[0252] 3. Cross-linking density test

[0253] By the swelling method, the sample was immersed in toluene for 72 hours, the swelling ratio was calculated and the cross-linking density was determined. The coating with higher cross-linking density formed a denser network structure.

[0254] 4. Drying rate test

[0255] Use ultraviolet light source (365nm) to irradiate, measure the change in drying thickness per unit time, and calculate the drying rate in μm / min.

[0256] 5. Anti-ultraviolet aging retention rate test

[0257] The dried samples were exposed to UV aging tester for 500 hours, the hardness was tested after aging, and the anti-UV aging retention rate was calculated to verify the weather resistance.

[0258] 6. Surface gloss test

[0259] The surface gloss (GU) of the dried coating was measured using a gloss meter at an angle of 20° and the average of three measurements was taken as the data.

[0260] 7. Adhesion test

[0261] The coating was cut into 100 grids using the 100-grid test method, and the adhesion was tested using tape, with adhesion indicated on a scale of 1-5.

[0262] Experimental data table

[0263]

[0264] Data analysis and validation

[0265] Curing time

[0266] The curing time of the inventive formulation (Experiment 3) was 30 minutes, which was half of the 60 minutes of the basic formulation (Experiment 1), indicating the synergistic acceleration effect of the photopolymerization and crosslinking reaction of the acrylate.

[0267] Film hardness

[0268] The hardness of the inventive formula reaches H, while the hardness of the high acrylate formula (Experiment 4) is 2H, indicating that the photopolymerization of acrylate significantly enhances the hardness of the coating, making it suitable for applications requiring high wear resistance.

[0269] Crosslink density

[0270] The crosslinking density of the inventive formula is 1.5 mol / m 3 , significantly higher than the basic formula of 0.8mol / m 3 , verifying that the combination of photopolymerization and cross-linking reactions generated a more complex cross-linked network and improved the coating strength.

[0271] Drying rate

[0272] The drying rate of the inventive formula is 5.5 μm / min, which is higher than 2.5 μm / min of the basic formula, indicating that the photopolymerization of acrylate greatly improves the drying rate.

[0273] Anti-ultraviolet aging retention rate

[0274] The anti-ultraviolet aging retention rate of the inventive formula is 90%, which is significantly improved compared to the basic formula (75%), indicating that the photopolymerization of acrylate enhances the weather resistance of the coating, making it more suitable for use in environments exposed to ultraviolet rays for a long time.

[0275] Surface gloss

[0276] The surface gloss of the inventive formula reaches 95GU, which is higher than the 85GU of the basic formula. The combination of photoinitiator and acrylate makes the coating surface more uniform and smooth, improving the visual effect and decorativeness.

[0277] Adhesion

[0278] The adhesion test result of the inventive formula was level 1 (highest adhesion), while the adhesion of the basic formula was level 3. The synergistic effect of the more complex cross-linking structure and photopolymerization increased the stability and adhesion of the coating, ensuring that the coating would not fall off easily.

[0279] Through the comparative analysis of the above experimental data, the following conclusions can be drawn:

[0280] Significantly improved drying speed: The inventive formula significantly shortens the curing time and increases the drying rate through the cross-linking reaction of polyether polyol and isocyanate and the photopolymerization of acrylate. This combination significantly speeds up the construction efficiency of furniture paint and is particularly suitable for applications that require fast curing.

[0281] Enhanced hardness and wear resistance: The photopolymerization in the inventive formula produces a coating of higher hardness, which improves the scratch resistance and wear resistance of the coating, making it more suitable for furniture surfaces with higher surface strength requirements.

[0282] Increased cross-linking density: Photopolymerization combined with cross-linking reactions produces a more complex cross-linking network, making the overall structure of the coating tighter, providing stronger mechanical strength and higher durability.

[0283] Improved weather resistance: The inventive formula exhibits higher resistance to UV aging and is suitable for long-term outdoor or high UV environment use.

[0284] Improved gloss and adhesion: Higher surface gloss and adhesion further demonstrate the decorative effect of the invention and the stability of the coating, ensuring the durability and aesthetics of the coating in actual use.

[0285] These results demonstrate that the present invention is a significant improvement over the prior art, especially in terms of increasing drying speed, enhancing coating performance and increasing service life.

[0286] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-drying polyurethane furniture paint curing agent, characterized in that: The following ingredients are included in parts by weight composition: Polyether polyol: 30-50 parts Acrylate monomer: 15-30 parts Isocyanate: 15-25 parts Photoinitiator: 1-5 parts Catalyst: 0.5-3 parts Leveling agent: 1 to 5 parts Toughening agent: 1-5 parts Anti-ultraviolet agent: 0.5-2 parts Preservatives: 0.1 to 1 part Solvent: 5-8 parts Thickener: 0.1 to 2 parts.

2. The quick-drying polyurethane furniture paint curing agent according to claim 1, characterized in that: The photoinitiator is benzophenone, the catalyst is dimethylacetamide, and the leveling agent is a polyether leveling agent.

3. The quick-drying polyurethane furniture paint curing agent according to claim 1, characterized in that: The toughening agent is polyvinyl alcohol, and the anti-ultraviolet agent is triphenylmethane.

4. The quick-drying polyurethane furniture paint curing agent according to claim 1, characterized in that: The preservative is isothiazolinone, the solvent is 70% to 85% ethanol solution, and the thickener is polyacrylic acid.

5. A process for preparing a quick-drying polyurethane furniture paint curing agent, which is used to prepare the quick-drying polyurethane furniture paint curing agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Prepare the required raw materials, including polyether polyol, acrylate monomer, isocyanate, photoinitiator, catalyst, leveling agent, toughening agent, UV inhibitor, preservative, solvent and thickener; S2, adding polyether polyol and acrylate monomer into a container, and then stirring to mix the two uniformly; S3, then slowly add isocyanate into the container and continue stirring to allow it to completely dissolve and react; S4, add photoinitiator, catalyst, leveling agent, toughening agent, UV inhibitor, preservative and thickener into the container, and continue stirring until the mixture is uniform; S5, adding anti-ultraviolet agent, preservative and thickener to the container, and continuing to stir until the mixture is uniform; S6, transferring the mixture into a reactor, and heating the reactor to accelerate the reaction; S7, after the reaction is completed, the reaction product is cooled to room temperature; S8. Use a filtering device to filter the cooled mixture to remove unreacted substances and impurities, and finally obtain a quick-drying polyurethane furniture paint curing agent.

6. The preparation process of the quick-drying polyurethane furniture paint curing agent according to claim 5, characterized in that: In S2, the container uses a high shear stirrer with a stirring speed of 3000-3500 RPM and a stirring time of 10-15 min.

7. The preparation process of the quick-drying polyurethane furniture paint curing agent according to claim 5, characterized in that: In S3, the stirring speed of the high shear stirrer is 3000-3500 RPM, and the stirring time is 5-10 min.

8. The preparation process of the quick-drying polyurethane furniture paint curing agent according to claim 5, characterized in that: In the S4, the stirring speed of the high shear agitator is 4000-4500RPM, and the stirring time is 5-10min. In the S5, the stirring speed of the high shear agitator is 4000-4800RPM, and the stirring time is 10-13min.

9. The preparation process of the quick-drying polyurethane furniture paint curing agent according to claim 5, characterized in that: In the step S6, the reactor is heated to 60-80°C and maintained at this temperature for 2-4 hours. In the step S8, a stainless steel filter is used as the filtering device, and the filter pore size is 1-5 um.

10. The preparation process of the quick-drying polyurethane furniture paint curing agent according to claim 5, characterized in that: The curing agent finally obtained in S8, when used, has a mixing ratio of 1.0-1.5:4-6 with the polyurethane furniture paint.

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