Polyurethane transparent bottom coating material and preparation method thereof
By using high cross-linking density soybean oil short oil alkyd resin in polyurethane transparent primer materials, combined with curing agents and diluents of specific ratios, the rib swelling problem caused by traditional primers is solved, and better rib swelling and anti-sinking performance is achieved.
Patent Information
- Application Number
- CN202411831843.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-04-04
AI Technical Summary
Due to insufficient cross-linking density of traditional polyurethane transparent primer coating materials, solvents are more likely to penetrate into the substrate layer after topcoat coating, and tendons appear, affecting the aesthetic effect and development of furniture.
Soybean oil short oil alkyd resin is used as the main agent, combined with specific curing agent and diluent ratio to form a high-density paint film to prevent solvent penetration and effectively cross-link, and avoid reinforcement expansion.
After spraying two primers, the topcoat is applied without gluten is not gluten, which improves the decorative aesthetic effect of the furniture and enhances the anti-gluten performance of solid wood or veneer furniture.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to a polyurethane transparent base coating material and a preparation method thereof, in particular to a polyurethane transparent base coating material with good rib expansion resistance and sagging resistance and a preparation method thereof. Background Art
[0002] In an environment of increasingly fierce competition, major furniture factories are trying to reduce production costs and improve production efficiency without affecting product quality. Traditional solid wood or veneer furniture has gradually changed from spraying three or more coats of primer and then applying topcoat to spraying only two coats of primer and then applying topcoat.
[0003] Traditional polyurethane transparent base coating materials fail to form an effective dense paint film due to insufficient cross-linking density, and reduce one or more primer coatings, resulting in the solvent more easily penetrating into the substrate layer after the topcoat is applied, dissolving the substrate and causing rib expansion. The rib expansion problem also follows after the topcoat is sprayed.
[0004] The phenomenon of expanding tendons greatly affects the aesthetic effect of furniture coating and decoration, and also restricts the development of solid wood or veneer furniture. Summary of the invention
[0005] The invention provides a polyurethane transparent base coating material and a preparation method thereof, wherein the problem of rib expansion can be effectively solved by applying topcoat after spraying two coats of primer.
[0006] The present invention can provide a polyurethane transparent base coating material, which comprises a main agent, a curing agent, and a diluent. Based on the total weight of the main agent, the main agent comprises 57-70 parts of soybean oil short oil alkyd resin.
[0007] When the content of the soybean oil short oil alkyd resin is less than 57 parts, the anti-bulging performance cannot be achieved. When the content of the soybean oil short oil alkyd resin is greater than 70 parts, there is a disadvantage of insufficient crosslinking with the curing agent, resulting in bulbing.
[0008] In one embodiment, the soybean oil short oil alkyd resin may be resin 31064. Compared with other soybean oil short oil alkyd resins, resin 31064 has the advantages of high cross-linking density, stronger paint film density, and better anti-beading performance.
[0009] In one embodiment, based on the total weight of the main agent, the main agent may further comprise: Castor oil resin 5-15 parts Butyl ester 1-10 parts 3-8 parts of xylene Propylene glycol methyl ether acetate 2-10 parts Defoamer 0.1-0.5 parts 5-20 parts of talcum powder Zinc powder 1-5 parts 1-5 parts of anti-settling agent.
[0010] In one embodiment, based on the total weight of the curing agent, the curing agent may include: Aromatic isocyanate 40-65 parts 10-30 parts of trimer isocyanate 20-35 parts of butyl acetate.
[0011] In one embodiment, based on the total weight of the diluent, the diluent may comprise: 15-25 parts of xylene 40-60 parts of butyl acetate Propylene glycol methyl ether acetate 10-30 parts.
[0012] In one embodiment, the weight ratio of the main agent, curing agent and diluent can be 1-1.5: 0.5-0.8: 0.6-1. Within the above weight ratio range, the sprayed topcoat can be made without bulging.
[0013] In one embodiment, the defoaming agent may be a modified silicone defoaming agent. When the modified silicone defoaming agent is used as the defoaming agent, it has the advantage of fast defoaming speed.
[0014] In one embodiment, the zinc powder may be zinc stearate. When zinc stearate is used as the zinc powder, the paint film is polished and crisp and easy to produce powder.
[0015] In one embodiment, the anti-settling agent may be polyethylene wax. When polyethylene wax is used as the anti-settling agent, the main paint does not precipitate and the mixed paint liquid after dilution is not easy to separate.
[0016] The present invention also provides a method for preparing a polyurethane transparent base coating material, the method comprising the following steps: preparing a main agent, wherein the main agent contains 57-70 parts of soybean oil short oil alkyd resin based on the total weight of the main agent; preparing a curing agent; preparing a diluent; and preparing the main agent, the curing agent and the diluent to obtain the polyurethane transparent base coating material.
[0017] The main agent can be prepared according to the following preparation method: based on the total weight of the main agent, 57-70 parts of soybean oil short oil alkyd resin, 5-15 parts of castor oil resin, 3-8 parts of xylene, 1-5 parts of anti-settling agent, and 0.1-0.5 parts of defoaming agent are mixed, and the mixture is dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; then 1-5 parts of zinc powder and 5-20 parts of talcum powder are added, and the mixture is dispersed at a speed of 1000-1200 rpm for 15 minutes; and 2-10 parts of propylene glycol methyl ether acetate and 1-10 parts of butyl acetate are added, and the mixture is dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform.
[0018] The diluent can be prepared according to the following preparation method: based on the total weight of the diluent, 15-25 parts of xylene, 40-60 parts of butyl acetate, and 10-30 parts of propylene glycol methyl ether acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0019] The curing agent can be prepared according to the following preparation method: based on the total weight of the curing agent, 40-65 parts of aromatic isocyanate, 10-30 parts of trimer isocyanate, and 20-35 parts of butyl acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0020] In the method for preparing a polyurethane transparent base coating material, the weight ratio of the main agent, the curing agent and the diluent can be 1-1.5:0.5-0.8:0.6-1.
[0021] After the main agent is prepared, it can be filtered and packaged with an 80-120 mesh filter. After the diluent is prepared, it can be filtered and packaged with a 300-500 mesh filter. After the curing agent is prepared, it can be filtered and packaged with a 300-500 mesh filter. This will ensure that the diluent and curing agent are free of mechanical impurities and make the paint film smoother.
[0022] The castor oil resin is preferably castor oil resin RA16-70 produced by Bogao; The talcum powder is preferably 1250 mesh talcum powder produced by Foshan Housheng; The zinc powder is preferably TV-A product produced by Guangdong Hanwei; The anti-settling agent is preferably 6900-20X anti-settling agent produced by Desbaron; The defoaming agent is preferably the 141 product produced by German BYK.
[0023] The principle of the polyurethane transparent bottom coating material provided by the present invention is as follows: The resin used in the polyurethane transparent base coating material provided by the present invention adopts soybean oil short oil alkyd resin with high hydroxyl value (hydroxyl value higher than 140), fast drying and good permeability. It can better penetrate into the interior of the substrate and react with the curing agent to form a highly dense paint film, which can effectively protect the substrate from being swollen by the solvent, thereby solving the problem of rib expansion to a limited extent.
[0024] The polyurethane transparent bottom coating material prepared by the present invention can be applied to various furniture, especially solid wood or veneer furniture with high requirements for anti-rib expansion, and the polyurethane transparent bottom coating material provided by the present invention has the following advantages: 1) The new product has stronger permeability than conventional products, better wettability to the substrate, and less prone to eye rounding when applied to the primer; 2) The paint film of the new product has a higher cross-linking density than conventional primers, and its anti-collapse property is stronger than that of traditional primers. The anti-inflation effect of two coats of construction is significantly better than that of traditional primers. After the same topcoat is applied, the paint film is fuller and rounder and less likely to collapse. DETAILED DESCRIPTION
[0025] The present invention is described in detail below with reference to specific embodiments.
[0026] Example 1 The polyurethane transparent base coating material is prepared from a main agent, a curing agent, and a diluent in a weight ratio of 1:0.5:0.6; The main agent is prepared according to the following preparation method: based on the total weight of the main agent, 57 parts of soybean oil short oil alkyd resin (resin 31064 produced by Changxing Chemical), 6 parts of castor oil resin (castor oil resin RA16-70 produced by Bogao), 4 parts of xylene, 2 parts of anti-settling agent (6900-20X produced by Desbaron), and 0.2 parts of defoaming agent (141 product produced by German BYK) are mixed, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; then 4 parts of zinc powder (TV-A product produced by Guangdong Hanwei) and 15 parts of talcum powder (1250 mesh talcum powder produced by Foshan Housheng) are added, and then dispersed at a speed of 1000-1200 rpm for 15 minutes; then 4 parts of propylene glycol methyl ether acetate and 7.8 parts of butyl fat are added, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform. The diluent is prepared according to the following preparation method: based on the total weight of the diluent, 24 parts of xylene, 60 parts of butyl acetate and 16 parts of propylene glycol methyl ether acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0027] The curing agent is prepared according to the following preparation method: based on the total weight of the curing agent, 43 parts of aromatic isocyanate, 25 parts of trimer isocyanate and 32 parts of butyl acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0028] After the main agent is prepared, it is filtered and packaged with an 80-mesh filter. After the diluent is prepared, it is filtered and packaged with a 300-mesh filter. After the curing agent is prepared, it is filtered and packaged with a 300-mesh filter.
[0029] Example 2 The polyurethane transparent bottom coating material is prepared from a main agent, a curing agent, and a diluent in a weight ratio of 1:0.7:0.7; The main agent is prepared according to the following preparation method: based on the total weight of the main agent, 70 parts of soybean oil short oil alkyd resin (resin 31064 produced by Changxing Chemical), 5 parts of castor oil resin (castor oil resin RA16-70 produced by Bogao), 4 parts of xylene, 2 parts of anti-settling agent (6900-20X anti-settling agent produced by Desbaron), and 0.2 parts of defoaming agent (141 product produced by German BYK) are mixed, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; then 4 parts of zinc powder (TV-A product produced by Guangdong Hanwei) and 7 parts of talcum powder (1250 mesh talcum powder produced by Foshan Housheng) are added, and then dispersed at a speed of 1000-1200 rpm for 15 minutes; then 4 parts of propylene glycol methyl ether acetate and 3.8 parts of butyl fat are added, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform. The diluent is prepared according to the following preparation method: Based on the total weight of the diluent, 20 parts of xylene, 60 parts of butyl acetate and 20 parts of propylene glycol methyl ether acetate are dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0030] The curing agent is prepared according to the following preparation method: 50 parts of aromatic isocyanate, 20 parts of trimer isocyanate and 30 parts of butyl acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0031] After the main agent is prepared, it is filtered and packaged with an 80-mesh filter. After the diluent is prepared, it is filtered and packaged with a 300-mesh filter. After the curing agent is prepared, it is filtered and packaged with a 300-mesh filter.
[0032] Example 3 The polyurethane transparent bottom coating material is prepared from a main agent, a curing agent, and a diluent in a weight ratio of 1.2:0.8:0.7; The main agent is prepared according to the following preparation method: based on the total weight of the main agent, 62 parts of soybean oil short oil alkyd resin (resin 31064 produced by Changxing Chemical), 5 parts of castor oil resin (castor oil resin RA16-70 produced by Bogao), 4 parts of xylene, 2 parts of anti-settling agent (6900-20X anti-settling agent produced by Desbaron), and 0.3 parts of defoaming agent (141 product produced by German BYK) are mixed, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; then 3 parts of zinc powder (TV-A product produced by Guangdong Hanwei) and 17 parts of talcum powder (1250 mesh talcum powder produced by Foshan Housheng) are added, and then dispersed at a speed of 1000-1200 rpm for 15 minutes; then 3 parts of propylene glycol methyl ether acetate and 3.7 parts of butyl fat are added, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; The diluent is prepared according to the following preparation method: Based on the total weight of the diluent, 25 parts of xylene, 58 parts of butyl acetate and 17 parts of propylene glycol methyl ether acetate are dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0033] The curing agent is prepared according to the following preparation method: based on the total weight of the curing agent, 60 parts of aromatic isocyanate, 20 parts of trimer isocyanate and 20 parts of butyl acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0034] After the main agent is prepared, it is filtered and packaged with an 80-mesh filter. After the diluent is prepared, it is filtered and packaged with a 300-mesh filter. After the curing agent is prepared, it is filtered and packaged with a 300-mesh filter.
[0035] Comparative Example 1 The polyurethane transparent base coating material is prepared from a main agent, a curing agent, and a diluent in a weight ratio of 1:0.5:0.6; The main agent is prepared according to the following preparation method: based on the total weight of the main agent, 52 parts of soybean oil short oil alkyd resin (resin 31064 produced by Changxing Chemical), 6 parts of castor oil resin (castor oil resin RA16-70 produced by Bogao), 4 parts of xylene, 2 parts of anti-settling agent (6900-20X anti-settling agent produced by Desbaron), and 0.2 parts of defoaming agent (141 product produced by German BYK) are mixed, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; then add 4 parts of zinc powder (TV-A product produced by Guangdong Hanwei) and 20 parts of talcum powder (1250 mesh talcum powder produced by Foshan Housheng), and disperse at a speed of 1000-1200 rpm for 15 minutes; then add 4 parts of propylene glycol methyl ether acetate and 7.8 parts of butyl fat, and disperse at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform.
[0036] The diluent is prepared according to the following preparation method: Based on the total weight of the diluent, 24 parts of xylene, 60 parts of butyl acetate and 16 parts of propylene glycol methyl ether acetate are dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0037] The curing agent is prepared according to the following preparation method: based on the total weight of the curing agent, 43 parts of aromatic isocyanate, 25 parts of trimer isocyanate and 32 parts of butyl acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0038] After the main agent is prepared, it is filtered and packaged with an 80-mesh filter. After the diluent is prepared, it is filtered and packaged with a 300-mesh filter. After the curing agent is prepared, it is filtered and packaged with a 300-mesh filter.
[0039] Comparative Example 2 The polyurethane transparent bottom coating material is prepared from a main agent, a curing agent, and a diluent in a weight ratio of 1:0.7:0.7; The main agent is prepared according to the following preparation method: based on the total weight of the main agent, 75 parts of soybean oil short oil alkyd resin (resin 31064 produced by Changxing Chemical), 5 parts of castor oil resin (castor oil resin RA16-70 produced by Bogao), 3 parts of xylene, 1 part of anti-settling agent (6900-20X anti-settling agent produced by Desbaron), and 0.2 parts of defoaming agent (141 product produced by German BYK) are mixed, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform; then 5 parts of zinc powder (TV-A product produced by Guangdong Hanwei) and 5 parts of talcum powder (1250 mesh talcum powder produced by Foshan Housheng) are added, and then dispersed at a speed of 1000-1200 rpm for 15 minutes; then 2 parts of propylene glycol methyl ether acetate and 3.8 parts of butyl fat are added, and then dispersed at a speed of 600-800 rpm for 5-8 minutes until the mixed solution is uniform. The diluent is prepared according to the following preparation method: 20 parts of xylene, 60 parts of butyl acetate and 20 parts of propylene glycol methyl ether acetate are dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0040] The curing agent is prepared according to the following preparation method: 50 parts of aromatic isocyanate, 20 parts of trimer isocyanate and 30 parts of butyl acetate are mixed, and then dispersed at a speed of 300-700 rpm for 3-8 minutes until the mixed liquid is uniform.
[0041] After the main agent is prepared, it is filtered and packaged with an 80-mesh filter. After the diluent is prepared, it is filtered and packaged with a 300-mesh filter. After the curing agent is prepared, it is filtered and packaged with a 300-mesh filter.
[0042] In the above embodiments and comparative examples: After testing various embodiments and comparative examples, the performance indicators and technical indicators of the polyurethane transparent bottom coating material are shown in the following tables: Table 1 shows various technical performance indicators and experimental data of various embodiments and comparative examples of the polyurethane transparent bottom coating material provided by the present invention: It can be clearly seen from Table 1 that the technical performances of the various embodiments of the polyurethane transparent base coating material provided by the present invention all reach or exceed the technical indicators in the national standard GB / T23997-2009.
[0043] Table 2 shows the environmental protection experimental data of various embodiments and comparative examples of the polyurethane transparent bottom coating material provided by the present invention: It can be clearly seen from Table 2 that the VOC (volatile organic compounds) and soluble heavy metals contained in the embodiments and comparative examples of the present invention are better than the GB18581-2020 standard, meet environmental protection and health requirements, and are safe and reliable to use.
[0044] Table 3 shows the boiling point and flash point data of each component of the diluent of the polyurethane transparent base coating material provided by the present invention: It can be clearly seen from Table 3 that the boiling points of the components of the diluent provided by the present invention are all ≥60° C., the diluent has a suitable volatilization rate, and can improve the decorativeness of the coating during painting.
[0045] Table 4 shows the experimental data of testing the expansion of ribs on ebony wood and black walnut substrates under different coating thickness conditions for each embodiment and comparison of the polyurethane transparent base coating material provided by the present invention: It can be clearly seen from Table 4 that the anti-rib expansion performance of the embodiments of the present invention is significantly better than that of the comparative examples on different substrates and different paint film thicknesses.
[0046] Table 5 is the experimental data of pencil hardness and abrasion resistance of various embodiments and comparative examples of the polyurethane transparent base coating material provided by the present invention: It can be clearly seen from Table 5 that the experimental data of pencil hardness and abrasion resistance of the paint films of the embodiments and comparative examples of the present invention all reach or exceed the technical indicators in the national standard GB / T23997-2009, and the paint films have a certain scratch resistance.
[0047] The above specific implementation methods are only detailed explanations of the technical solutions of the present invention. The present invention is not limited to the above embodiments. Any improvements or replacements based on the principles of the present invention should be within the protection scope of the present invention.
Claims
1. A polyurethane transparent bottom coating material, characterized in that: The polyurethane transparent base coating material comprises a main agent, a curing agent and a diluent. Based on the total weight of the main agent, the main agent comprises 57-70 parts of soybean oil short oil alkyd resin.
2. The polyurethane transparent base coating material according to claim 1, characterized in that: The soybean oil short oil alkyd resin is resin 31064.
3. The polyurethane transparent base coating material according to claim 1, characterized in that: Based on the total weight of the main agent, the main agent further comprises: Castor oil resin 5-15 parts Butyl ester 1-10 parts 3-8 parts of xylene Propylene glycol methyl ether acetate 2-10 parts Defoamer 0.1-0.5 parts 5-20 parts of talcum powder Zinc powder 1-5 parts 1-5 parts of anti-settling agent.
4. The polyurethane transparent base coating material according to claim 1, characterized in that: Based on the total weight of the curing agent, the curing agent comprises: Aromatic isocyanate 40-65 parts 10-30 parts of trimer isocyanate 20-35 parts of butyl acetate.
5. The polyurethane transparent base coating material according to claim 1, characterized in that: Based on the total weight of the diluent, the diluent comprises: 15-25 parts of xylene 40-60 parts of butyl acetate Propylene glycol methyl ether acetate 10-30 parts.
6. The polyurethane transparent base coating material according to claim 1, characterized in that: The weight ratio of the main agent, the curing agent and the diluent is 1-1.5:0.5-0.8:0.6-1.
7. The polyurethane transparent base coating material according to claim 3, characterized in that: The defoamer is a modified silicone defoamer.
8. The polyurethane transparent base coating material according to claim 3, characterized in that: The zinc powder is zinc stearate.
9. A method for preparing a polyurethane transparent bottom coating material, characterized in that: The method comprises the following steps: Prepare a main agent, wherein the main agent comprises 57-70 parts of soybean oil short oil alkyd resin based on the total weight of the main agent; preparing a curing agent; preparing a diluent; The main agent, curing agent and diluent are prepared to obtain a polyurethane transparent base coating material.
10. The method for preparing a polyurethane transparent base coating material according to claim 10, characterized in that: The weight ratio of the main agent, the curing agent and the diluent is 1-1.5:0.5-0.8:0.6-1.