Full-matt anti-floating finish paint used for woodware at low temperature and preparation method of finish paint

Abstract

The invention relates to the technical field of coatings, in particular to a full-matte anti-floating finishing coat used for woodware at low temperature and a preparation method thereof. The invention provides the full-matte anti-floating finishing coat used at low temperature, the phenomenon that the paint film of the existing finishing coat is floating in the construction process at low temperature in winter is solved, the to-be-dried paint film is not floating when the finishing coat is constructed at-10 DEG C, and the finishing coat has the characteristics of good paint film flatness, good leveling property, high hardness, excellent fullness and the like at low temperature. According to the full-matte anti-floating finish paint, spraying equipment does not need to be adjusted, an original construction mode does not need to be changed, the delivery efficiency of a furniture factory can be improved, and the full-matte anti-floating finish paint has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a full-matte anti-smearing topcoat used for wood at low temperatures and a preparation method thereof. Background Art

[0002] In recent years, with the increasing awareness of environmental protection, some practices in the northern region have also changed. In winter, due to the limitations of wood burning for heating, some small and medium-sized furniture factories may face construction challenges in winter. In this case, these furniture factories need to find alternative construction solutions to adapt to current environmental requirements. Therefore, how to design a full matte anti-smear topcoat for wood products at low temperatures to improve the adaptability of the product at low temperatures, thereby enhancing the competitiveness of the product in the entire furniture paint industry, has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0003] The present invention proposes a full matte anti-smear topcoat for use at low temperatures by optimizing and adjusting the formula in large quantities, thereby solving the problem of paint film blooming during the construction of existing topcoats at low temperatures in winter. The full matte anti-smear topcoat of the present invention comprises component A, component B and component C, wherein component A comprises the following components in parts by weight: 72~82 parts of soybean oil fatty acid modified alkyd resin

[0004] 1~3 parts of polyacetyl wax anti-settling agent

[0005] Defoaming agent 0.1~0.5 parts

[0006] Wetting and dispersing agent 0.1~0.5 parts

[0007] Leveling agent 0.1~0.5 parts

[0008] Matting agent 5~9 parts

[0009] Butyl acetate 5~10 parts

[0010] 1-3 parts of propylene glycol methyl ether acetate; The leveling agent is at least one of a fluorocarbon modified polyacrylate leveling agent and a polyether modified polydimethylsiloxane copolymer leveling agent; The B component includes the following ingredients in parts by weight: 35~40 copies of trimer

[0011] 40~50 parts of adduct

[0012] 10-25 parts of butyl acetate; The C component includes the following ingredients by weight: 30~55 parts of butyl acetate

[0013] Ethyl acetate or dimethyl carbonate 15-20 parts

[0014] Propylene glycol methyl ether acetate 5~25 parts

[0015] 15~25 parts of xylene.

[0016] The present invention adopts soybean oil fatty acid modified alkyd resin and a specific type of dispersant, leveling agent and anti-settling agent in combination, thereby eliminating the paint film blooming factor caused by incompatibility factors and the paint film blooming factor in a low temperature environment, so that the paint film does not bloom when the topcoat is used under low temperature conditions, thereby improving the low temperature adaptability of the topcoat.

[0017] Among them, the specific resin, dispersant and leveling agent system of the present invention can promote the polyacetyl wax anti-settling agent to form a loose three-dimensional network structure in the system, has good thixotropy, and can make the entire system a stable uniform body that is not easy to settle. At the same time, during the drying process of the paint film, the matting agent can have a good arrangement effect, and the paint film will not have a blooming phenomenon.

[0018] Preferably, the weight ratio of component A, component B and component C is 1:(0.4-0.6):(0.4-0.6).

[0019] Preferably, the matting agent is a composite spherical matting agent.

[0020] The composite spherical matting agent has small particle size, uniform particle size distribution, large porosity, low oil absorption, high matting efficiency, good coating transparency, is easily dispersed and wrapped by the soybean oil fatty acid modified alkyd resin used in the present invention, and has a delicate hand feel.

[0021] Preferably, the trimer is a polyisocyanate trimer, preferably a toluene diisocyanate trimer.

[0022] Furthermore, the present invention has found that the use of the composite spherical matting agent and toluene diisocyanate trimer can significantly improve the transparency and fullness of the topcoat of the present invention, thereby improving construction efficiency and reducing construction costs.

[0023] Preferably, the defoamer is a mineral oil defoamer that does not contain silicone.

[0024] Preferably, the defoaming agent is a mixture of a foam-breaking polymer and polysiloxane.

[0025] Preferably, the wetting and dispersing agent is a low molecular weight unsaturated polycarboxylic acid polymer solution.

[0026] In the system of the present invention, the wetting dispersant can make the matting agent evenly dispersed in the coating system, realize the stable dispersion of the matting agent particles, and can be completely wrapped by the system, thereby preventing the matting agent from leaking on the surface of the paint film, which is more conducive to the stability of the gloss and the flatness of the paint film.

[0027] Preferably, the adduct is a toluene diisocyanate adduct.

[0028] Preferably, the A component comprises the following ingredients in parts by weight: 78~80 parts of soybean oil fatty acid modified alkyd resin

[0029] 1~2 parts of polyacetyl wax anti-settling agent

[0030] Defoaming agent 0.3~0.5 parts

[0031] Wetting and dispersing agent 0.4~0.5 parts

[0032] Leveling agent 0.1~0.3 parts

[0033] Matting agent 7~9 parts

[0034] Butyl acetate 7~9 parts

[0035] Propylene glycol methyl ether acetate 2-3 parts; The B component includes the following ingredients in parts by weight: 35~40 copies of trimer

[0036] 40~45 parts of adduct

[0037] 20-25 parts of butyl acetate; The C component includes the following ingredients by weight: 30~40 parts of butyl acetate

[0038] Ethyl acetate or dimethyl carbonate 15-20 parts

[0039] Propylene glycol methyl ether acetate 5~25 parts

[0040] 20~25 parts of xylene.

[0041] Furthermore, the present invention provides a method for preparing the full-matt anti-smudge topcoat, comprising: respectively mixing the component A, component B and component C evenly according to their respective component ratios, and then evenly blending the component A, component B and component C according to the usage ratio.

[0042] Preferably, the preparation method of the A component comprises: mixing soybean oil fatty acid modified alkyd resin, part of butyl acetate and polyacetyl wax anti-settling agent, then adding defoamer, leveling agent and wetting dispersant, and then adding matting agent to disperse to a fineness of ≤20 μm, and finally adding the remaining butyl acetate and propylene glycol methyl ether acetate to obtain the A component.

[0043] Preferably, the portion of butyl acetate is 30% to 50% of the total weight of butyl acetate.

[0044] Preferably, the soybean oil fatty acid modified alkyd resin, part of butyl acetate and polyacetyl wax anti-settling agent are mixed, stirred at a speed of 500-800 r / min for 10-15 min, then a defoamer, a leveling agent and a wetting and dispersing agent are added, and stirred at a speed of 500-800 r / min for 10-15 min, and then a matting agent is added and stirred at a speed of 1000-1200 r / min for 20-30 min, dispersed to a fineness of ≤20 μm, and finally the remaining butyl acetate and propylene glycol methyl ether acetate are added to prepare the A component (main agent).

[0045] It is well known in the art that the dispersion may include operations of crushing, dispersing and mixing slurry raw materials of different viscosities. Through the high-speed operation of the equipment, the materials are subjected to high-speed and strong shearing, crushing and dispersion to achieve the functions of rapid mixing, dissolving, dispersing and / or refining.

[0046] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a full matte anti-smearing topcoat for use at low temperatures, which solves the problem of paint film blooming during the construction of existing topcoats at low temperatures in winter, and can achieve paint film blooming when the paint is dried at -10°C, and has the characteristics of good paint film flatness, good leveling, high hardness, and excellent fullness at low temperatures. The full matte anti-smearing topcoat of the present invention does not require adjustment of spraying equipment or change of the original construction method, and can improve the delivery efficiency of furniture factories, and has broad application prospects. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are 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.

[0048] If no specific techniques or conditions are specified in the examples, all are carried out according to conventional methods or the techniques or conditions described in the literature in the field, or according to the product instructions. If no manufacturer is specified for the reagents and instruments used, all are conventional products that can be purchased through regular channels.

[0049] Example 1

[0050] This embodiment provides a full matte anti-smear topcoat (clear topcoat), which is composed of component A, component B and component C. The preparation method of component A (main agent) includes: 80 kg of soybean oil fatty acid modified alkyd resin (Zhuhai Zhanchen New Materials Co., Ltd., 1160-70) and 3 kg of butyl acetate and 1 kg of anti-settling agent (HX8800 produced by Guangzhou Huaxia Chemical Co., Ltd.) were mixed and stirred at a speed of 500 r / min for 10 min; Slowly add 0.4kg of defoamer (BYK141 produced by BYK, Germany), 0.1kg of leveling agent (BYK333 produced by BYK, Germany) and 0.5kg of dispersant (BYK104 produced by BYK, Germany) and mix, and disperse at a speed of 500r / min for 10min; Slowly add 8kg of matting powder (ZC-518 matting powder produced by Shaoguan Ruijing New Material Technology Co., Ltd.), stir and disperse at a speed of 1000r / min for 20min, and disperse to a fineness of ≤20μm; Finally, add 4kg of butyl acetate and 3kg of propylene glycol methyl ether acetate, disperse evenly and package separately.

[0051] The preparation method of component B comprises: 40kg of trimer (OK-50AB from Zhuhai Zhanchen New Materials), 40kg of adduct (L-75 from Bayer AG, Germany) and 20kg of butyl acetate were mixed and dispersed evenly and packaged separately.

[0052] The preparation method of component C comprises: 55 kg of butyl acetate, 20 kg of xylene, 5 kg of propylene glycol methyl ether acetate and 20 kg of ethyl acetate are mixed, dispersed evenly and packaged separately.

[0053] Example 2

[0054] This embodiment provides a full matte anti-smear topcoat (clear topcoat), which is composed of component A, component B and component C. The preparation method of component A (main agent) includes: 78 kg of soybean oil fatty acid modified alkyd resin (Zhuhai Zhanchen New Materials Co., Ltd., 1160-70) and 3 kg of butyl acetate and 1 kg of anti-settling agent (HX8800 produced by Guangzhou Huaxia Chemical Co., Ltd.) were mixed and stirred at a speed of 500 r / min for 10 min; Slowly add 0.4kg of defoamer (BYK141 produced by BYK, Germany), 0.3kg of leveling agent (AFCONA3777 produced by Efcona) and 0.5kg of dispersant (BYK104 produced by BYK, Germany), mix, and disperse at a speed of 500r / min for 10min; Slowly add 8kg of matting powder (Grace 7000 matting powder from the United States), stir and disperse at a speed of 1000r / min for 20min, until the fineness is ≤20μm; Finally, add 5.8 kg of butyl acetate and 3 kg of propylene glycol methyl ether acetate, disperse evenly and package separately.

[0055] The preparation method of component B comprises: 40kg of trimer (OK-50AB from Zhuhai Zhanchen New Materials), 40kg of adduct (L-75T from Bogao Company) and 20kg of butyl acetate were mixed and dispersed evenly and packaged separately.

[0056] The preparation method of component C comprises: 35 kg of butyl acetate, 25 kg of xylene, 25 kg of propylene glycol methyl ether acetate and 15 kg of dimethyl carbonate are mixed, dispersed evenly and packaged separately.

[0057] Comparative Example 1

[0058] This comparative example provides a full matte anti-floating topcoat (clear topcoat), which is different from Example 1 only in that the soybean oil fatty acid modified alkyd resin is replaced with an equal amount of Changxing 3106-X-70 alkyd resin.

[0059] Comparative Example 2

[0060] This comparative example provides a full matte anti-floating topcoat (clear topcoat), which is different from Example 1 only in that the anti-settling agent is replaced by an equal amount of Better BK-3229 polyamide wax slurry.

[0061] Comparative Example 3

[0062] This comparative example provides a full matte anti-floating topcoat (clear topcoat), which is different from Example 1 only in that the leveling agent is replaced with an equal amount of Better BF-6210 acrylate leveling agent.

[0063] Comparative Example 4

[0064] This comparative example provides a full matte anti-floating topcoat (clear topcoat), which is different from Example 1 only in that the dispersant is replaced by an equal amount of KEPERDISP®-608S.

[0065] Comparative Example 5

[0066] This comparative example provides a full matte anti-floating topcoat (clear topcoat), which is different from Example 1 only in that the trimer is replaced by an equal amount of Covestro IL-1451.

[0067] Comparative Example 6

[0068] This comparative example provides a full matte anti-fading topcoat (clear topcoat), which is different from Example 1 only in that the matting powder is replaced with an equal amount of Xinhui HD-150.

[0069] Test Example 1

[0070] The performance of the full-matt anti-smear topcoat prepared in the above examples and comparative examples was tested, and the test items and test results are shown in Table 1.

[0071] Table 1

[0072] Test Example 2

[0073] The full matte anti-smearing topcoat prepared in the above embodiment and comparative example was sprayed in comparison with a commercially available PU full matte clear topcoat of the same grade, and the test process was as follows: 1: Material processing: The material is a 100cm*90cm rectangular black gold solid wood board, first use 240# sandpaper to polish and remove burrs and blow away dust; 2: Make PU clear primer: spray PU clear primer (Zhanchen New Materials) with oil, spray 110g / m 2 , polishing after 24 hours; 3: Repeat step 2 above; 4: Sanding: Use 400# sandpaper to make it flat, smooth and without bright spots, and then use 600# sandpaper to polish; 5: The matte anti-smearing topcoat prepared in the above examples and comparative examples and a commercially available PU matte clear topcoat of the same grade were sprayed on the plate with a construction viscosity of 12s and a spraying rate of 110 g / m 2 , dried at -10℃ for 12h.

[0074] The test items and test results are shown in Table 2.

[0075] Table 2

[0076] Note: 5 is the highest and 0 is the lowest.

[0077] It can be seen that the full-matt anti-floating topcoat of the present invention can be constructed at -10°C without heating the drying room, and a perfect paint film with a smooth paint film and no floating phenomenon can be obtained, and the paint film has good flatness and uniformity at low temperatures. Moreover, through the selection of matting powder and TDI trimer, the full-matt anti-floating topcoat used at low temperatures is greatly improved in transparency and fullness, thereby improving construction efficiency and reducing construction costs.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A full matte anti-smudge topcoat, characterized in that: It comprises component A, component B and component C, wherein component A comprises the following components in parts by weight: 72~82 parts of soybean oil fatty acid modified alkyd resin 1~3 parts of polyacetyl wax anti-settling agent Defoaming agent 0.1~0.5 parts Wetting and dispersing agent 0.1~0.5 parts Leveling agent 0.1~0.5 parts Matting agent 5~9 parts Butyl acetate 5~10 parts 1-3 parts of propylene glycol methyl ether acetate; The leveling agent is at least one of a fluorocarbon modified polyacrylate leveling agent and a polyether modified polydimethylsiloxane copolymer leveling agent; The B component includes the following ingredients in parts by weight: 35~40 copies of trimer 40~50 parts of adduct 10-25 parts of butyl acetate; The C component includes the following ingredients in parts by weight: 30~55 parts of butyl acetate Ethyl acetate or dimethyl carbonate 15-20 parts Propylene glycol methyl ether acetate 5~25 parts 15~25 parts of xylene.

2. The full matte anti-smudge topcoat according to claim 1, characterized in that: The weight ratio of the component A, the component B and the component C is 1:(0.4-0.6):(0.4-0.6).

3. The full matte anti-smudge topcoat according to claim 1, characterized in that: The matting agent is a composite spherical matting agent.

4. The full matte anti-smudge topcoat according to claim 1, characterized in that: The trimer is a polyisocyanate trimer, preferably a toluene diisocyanate trimer.

5. The full matte anti-smudge topcoat according to claim 1, characterized in that: The defoamer is a mineral oil defoamer that does not contain silicone.

6. The full matte anti-smudge topcoat according to claim 1, characterized in that: The wetting and dispersing agent is a low molecular weight unsaturated polycarboxylic acid polymer solution.

7. The full matte anti-smudge topcoat according to claim 1, characterized in that: The adduct is a toluene diisocyanate adduct.

8. The full matte anti-smudge topcoat according to claim 1, characterized in that: The A component includes the following ingredients in parts by weight: 78~80 parts of soybean oil fatty acid modified alkyd resin 1~2 parts of polyacetyl wax anti-settling agent Defoaming agent 0.3~0.5 parts Wetting and dispersing agent 0.4~0.5 parts Leveling agent 0.1~0.3 parts Matting agent 7~9 parts Butyl acetate 7~9 parts Propylene glycol methyl ether acetate 2-3 parts; The B component includes the following ingredients in parts by weight: 35~40 copies of trimer 40~45 parts of adduct 20-25 parts of butyl acetate; The C component includes the following ingredients in parts by weight: 30~40 parts of butyl acetate Ethyl acetate or dimethyl carbonate 15-20 parts Propylene glycol methyl ether acetate 5~25 parts 20~25 parts of xylene.

9. The method for preparing the full-matt anti-smudge topcoat according to any one of claims 1 to 8, characterized in that: include: The components A, B and C are mixed evenly according to their respective proportions, and then the components A, B and C are evenly blended according to the usage ratio.

10. The preparation method according to claim 9, characterized in that: The preparation method of the component A comprises: mixing soybean oil fatty acid modified alkyd resin, part of butyl acetate and polyacetyl wax anti-settling agent, then adding defoamer, leveling agent and wetting dispersant, then adding matting agent to disperse to a fineness of ≤20 μm, and finally adding the remaining butyl acetate and propylene glycol methyl ether acetate to obtain the component A.

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