Melamine resin coating with novel structure and convenient coating and curing process as well as preparation method and use method of melamine resin coating

Abstract

The invention discloses a new-structure melamine resin coating convenient in coating and curing process and a preparation method and a use method thereof, the new-structure melamine resin coating is composed of 100 parts of new-structure acylated melamine resin, 1-10 parts of an adhesion promoter, 5-15 parts of a curing accelerator and 2-6 parts of a functional auxiliary agent, and the new-structure melamine resin coating is used through the processes of uniform mixing, smearing, curing and the like. Wherein the acylated melamine resin with the new structure is prepared from 392 parts of stearoylated melamine, 200 parts of paraformaldehyde, 10 parts of diethanol amine, 40 parts of butanol, 60 parts of polyethylene glycol 200 and 280 parts of water through an amination reaction. The melamine resin coating with the novel structure is excellent in performance, the adhesive force (pull-off method) is larger than or equal to 8.0 MPa, the scratch resistance is larger than or equal to 10 N, the abrasion resistance value is smaller than or equal to 0.020 mg / 100r, the surface stain resistance is level 5, the water contact angle is 100-110 degrees, the surface crack resistance is larger than or equal to 48 h, and the surface cold and heat cycle resistance is larger than or equal to 5 times. And the coating has outstanding surface hardness and structural toughness, and is suitable for large-area coating and protection application of the surfaces of base materials made of various materials.

Description

Technical Field

[0001] The present invention relates to the field of surface protective coating and coating technology, and in particular to a new structure melamine resin coating with convenient coating and curing processes and a preparation method and a use method thereof, and in particular to a new structure melamine resin coating that can be directly used as a coating, has good surface coating properties, is convenient to cure, and has excellent coating properties. Background Art

[0002] Melamine-formaldehyde resin (melamine resin) is a typical thermosetting resin with excellent scratch resistance, adhesion, intrinsic flame retardancy and thermal stability. It is widely used in wood adhesives, paper impregnation agents, fiber molded plastics and other fields. However, melamine resin and its products often have problems such as hardness and brittle fracture after curing, moisture absorption and cracking, difficulty in forming a coating film during coating, and complicated and cumbersome curing process. Therefore, it is difficult to directly apply and cure them as a paint film or coating alone.

[0003] Despite this, people still continue to study the coating application technology of melamine resin. For example, Gao et al. prepared MF-Si resin grafted with (3-aminopropyl) triethoxysilane, and the contact angle increased from 70.56° to 105.29°, and the surface energy decreased from 46.8Nm / m to 23.5Nm / m; Cao et al. prepared stearic acid melamine by reacting stearyl chloride with melamine, and used the mixture with melamine to prepare acylated melamine resin coating; Wang et al. used a similar route to Cao, introducing alcohols and siloxanes in the amination reaction to prepare stearic acid melamine resin coating, and obtained a coating with a transparency of 95%, a hardness of 8H, a water contact angle of 104°, and good self-cleaning properties. These studies have achieved certain results in the film-forming properties of melamine resin, but have not paid enough attention to the large-area coating of melamine resin and the efficient curing of the coating. The melamine resin prepared by it has obvious coating operation requirements, 1000041

[0004] The curing process of the coating is complicated and tedious, and the reproducibility and reliability of the technology are poor. This has led to a large gap between the actual application of melamine resin in coatings and its engineering and large-scale commercial application.

[0005] To this end, the present invention provides a new structure melamine resin coating with convenient coating and curing process, and a preparation method and a use method thereof. The coating has made good progress in the coating property of melamine resin, the curing of coating film and the coating performance, and has a good prospect for large-scale industrial application. It can be evenly coated on the surface of substrates of different materials (such as gypsum board, glass board, steel plate and tinplate, etc.) over a large area. At the same time, the cured melamine resin coating exhibits excellent high adhesion, scratch resistance, pollution resistance and self-cleaning properties. Summary of the invention

[0006] The main purpose of the present invention is to solve the problems of poor coatability of melamine resin, complicated film curing and poor adhesion to substrates. At the same time, a new structure melamine resin coating with excellent comprehensive performance, high adhesion, anti-fouling, anti-scratch, excellent self-cleaning property and large-scale industrial application prospects is provided.

[0007] The new structure melamine resin coating with convenient coating and curing process and its preparation method and use method described in the present invention have made good progress in the coating property of melamine resin, curing of coating film and coating performance, etc., and have good prospects for large-scale industrial application. It can be evenly coated on the surface of substrates of different materials (such as gypsum board, glass board, steel plate and tinplate, etc.) over a large area. At the same time, the new structure melamine resin coating exhibits excellent performance characteristics such as high adhesion, anti-fouling, anti-scratch and self-cleaning.

[0008] According to a first aspect of the present invention, a new structure acylated melamine resin is provided, which is composed of the following raw materials in parts by weight: 392 parts of stearic acylated melamine, 200 parts of paraformaldehyde, 10 parts of diethanolamine, 40 parts of butanol, 60 parts of polyethylene glycol 200 and 280 parts of water, wherein the new structure acylated melamine resin is 1000042

[0009] The melamine resin is synthesized through an amination reaction, wherein the specific implementation process of the amination reaction is: 392 parts of stearic acylated melamine, 200 parts of paraformaldehyde, 10 parts of diethanolamine and 280 parts of water are placed in a three-necked flask, heated to 100°C, and when the water tolerance point appears, the temperature is lowered to 80°C, 40 parts of butanol and 60 parts of polyethylene glycol 200 are added, stirred evenly, and reacted for 3.0 hours to obtain a new structure acylated melamine resin. The new structure acylated melamine resin can meet the requirements of good coating properties on the surface of the substrate and the convenience of the coating curing process.

[0010] According to the second aspect of the present invention, a new structure melamine resin coating with convenient coating and curing process is provided, and the new structure melamine resin coating is composed of the following raw materials in parts by weight: 100 parts of new structure acylated melamine resin, 1 to 10 parts of adhesion promoter, 5 to 15 parts of curing promoter and 2 to 6 parts of functional additives.

[0011] In some optional implementations of some embodiments, the adhesion promoter is one or more of NSF302, AK6060, AK6075, RT3136, 615 and W540. Preferably, the adhesion promoter is 2 parts of AK6075.

[0012] In some optional implementations of some embodiments, the curing accelerator is one or more of citric acid solution, phosphoric acid, hydrochloric acid, sulfuric acid, and tartaric acid solution. Preferably, the curing accelerator is 12 parts of citric acid solution.

[0013] In some optional implementations of some embodiments, the functional auxiliary agent is one or more of triethyl phosphate, alkyl acrylate phosphate, 2-hydroxyethyl methacrylate phosphate, nano-silicon dioxide, nano-titanium dioxide, and nano-zinc oxide. Preferably, the functional auxiliary agent is 2.5 parts of 2-hydroxyethyl methacrylate phosphate.

[0014] According to a third aspect of the present invention, a method for preparing a new structure melamine resin coating with convenient coating and curing process is provided, comprising: placing 392 parts of stearic acylated melamine, 200 parts of paraformaldehyde, 10 parts of diethanolamine and 280 parts of water in a three-necked flask, heating to 100°C, and cooling to 80°C until the water tolerance point appears, adding 40 parts of butanol and 60 parts of polyethylene glycol 200, stirring evenly, and reacting for 3.0 hours to obtain a new structure acylated melamine resin; mixing the new structure acylated melamine resin, adhesion promoter, curing promoter and work 1000043

[0015] The energy additives are mixed according to a proportion to obtain the new structure melamine resin coating.

[0016] Furthermore, the new structure melamine resin coating can be applied in a conventional manner, such as brushing, roller coating or spraying, on the surface of different substrates (such as gypsum board, glass board, steel plate and tinplate, etc.), and can be uniformly applied over a large area, and can be cured at a constant temperature of 60 to 120°C for 1.0 to 5.0 hours, and the entire operation process is convenient, simple and efficient. It effectively solves the problems of poor coating, complicated and cumbersome operation of the coating curing process, and easy cracking of the coating when conventional melamine resin is used for coating application in the past.

[0017] According to a fourth aspect of the present invention, a method for using a new structure melamine resin coating with convenient coating and curing processes is provided, comprising: applying the new structure melamine resin coating by brushing, roller coating or spraying, uniformly coating the surface of different substrates (such as gypsum board, glass board, steel plate and tinplate, etc.), and curing at a constant temperature of 60 to 120°C for 1 to 5 hours to obtain a coating, wherein the coating has the following performance indicators: surface adhesion ≥8.0MPa, scratch resistance ≥10N, wear resistance ≤0.020mg / 100 revolutions, water contact angle of 100 to 110°, stain resistance of level 5, surface cracking resistance ≥48h, and surface resistance to cold and hot cycles ≥5 times.

[0018] The advantages and beneficial effects of the present invention are:

[0019] (1) The novel structure acylated melamine resin and its coating provided by the present invention can be applied to different substrate surfaces over a large area by conventional brushing, roller coating or spraying, and has the advantages of flexible and convenient process selection; and the coating can be cured in one step, and the operation process has outstanding convenience.

[0020] (2) The new structure melamine resin coating provided by the present invention has the advantages of being convenient, easy and efficient in coating film curing process and having excellent adaptability.

[0021] (3) The new structure melamine resin coating of the present invention solves the restrictive problems of the previous melamine resin, such as poor coating properties, complicated and cumbersome operation of the coating curing process, and easy cracking of the coating.

[0022] (4) After the new structure melamine resin coating of the present invention is processed, its coating performance is outstanding; surface adhesion (pull-off method) ≥8.0MPa, scratch resistance ≥10N, abrasion resistance value ≤0.020mg / 100 revolutions, water contact angle 100-110°, stain resistance of level 5, surface crack resistance ≥48h, surface resistance to cold and hot cycles ≥5 times. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0025] It should be noted that the raw materials used in the various embodiments of the melamine resin coating with a new structure and convenient coating and curing processes provided by the present invention can all be obtained through market channels.

[0026] Example 1

[0027] The present invention provides a new structure melamine resin coating with convenient coating and curing process. According to the mass fraction, 100 parts of new structure melamine resin, 4 parts of adhesion promoter (NSF302), 5 parts of curing promoter (sulfuric acid), and 4.5 parts of triethyl phosphate are uniformly mixed to obtain the new structure melamine resin coating. The coating is applied on the surfaces of different substrates by brushing. The formed coating film is dried at 60°C for 5.0h to obtain a new structure melamine resin coating. Its main performance indicators are as follows: adhesion (pull-off method) is 8.2MPa, scratch resistance is 10N, wear resistance value is 0mg / 100 revolutions, contact angle is 102°, surface stain resistance is level 5, surface crack resistance is 48h, and surface resistance to cold and hot cycles is 8 times.

[0028] The novel structure melamine resin is prepared by the following steps: 392 parts of stearic acid acylated melamine, 200 parts of polyformaldehyde, 10 parts of diethanolamine and 280 parts of water are placed in a three-necked flask, heated to 100°C, and when the water tolerance point appears, the temperature is lowered to 80°C, 40 parts of butanol and 60 parts of polyethylene glycol 200 are added, stirred evenly, and reacted for 3.0 hours to obtain the novel structure acylated melamine resin.

[0029] Examples 2 to 5 adopt a preparation method and a use method similar to that of Example 1, and are configured according to the ratios shown in Table 1 below. The difference between Examples 2 to 5 and Example 1 is that the raw materials and the ratios of the new structure melamine resin coating are different, and the reaction conditions are different.

[0030] Table 1 Material ratio and reaction conditions of Examples 1 to 6 (unit of measurement: mass fraction)

[0031]

[0032]

[0033] Furthermore, the same test method was used to perform performance tests on Examples 1 to 5, and the test results are shown in Table 2 below.

[0034] Table 2 Performance parameters of Examples 1 to 6

[0035]

[0036] As can be seen from Table 2, the present invention provides a new structure melamine resin coating with convenient coating and curing process, and its main performance indicators are as follows: surface adhesion (pull-off method) ≥8.0MPa, scratch resistance ≥10N, abrasion resistance value ≤0.020mg / 100 revolutions, water contact angle 100-110°, stain resistance of level 5, surface crack resistance ≥48h, and surface resistance to cold and hot cycles ≥5 times.

[0037] Obviously, it should be understood by those skilled in the art that the above-mentioned various steps of the present invention can be performed in a manner different from the present invention, and the simulation method and experimental equipment include but are not limited to the above description. The above-mentioned various steps of the present invention can be performed in an order different from that here in some cases, and the steps shown or described above can be performed separately. Therefore, the present invention is not limited to any specific combination of hardware and software.

[0038] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A new structure melamine resin coating with convenient coating and curing process, characterized in that: The new structure melamine resin coating is composed of the following raw materials in parts by weight: 100 parts of new structure acylated melamine resin, 1 to 10 parts of adhesion promoter, 5 to 15 parts of curing promoter and 2 to 6 parts of functional auxiliary agent.

2. A new structure melamine resin coating with convenient coating and curing process according to claim 1, characterized in that: The novel structure acylated melamine resin is composed of the following raw materials in parts by weight: 392 parts of stearic acylated melamine, 200 parts of paraformaldehyde, 10 parts of diethanolamine, 40 parts of butanol, 60 parts of polyethylene glycol 200 and 280 parts of water. The novel structure acylated melamine resin is synthesized through an amination reaction.

3. The new structure melamine resin coating with convenient coating and curing process according to claim 1, characterized in that: The adhesion promoter is one or more of NSF302, AK6060, AK6075, RT3136, 615 and W540.

4. The new structure melamine resin coating with convenient coating and curing process according to claim 3, characterized in that: The adhesion promoter is 2 parts of AK6075.

5. The new structure melamine resin coating with convenient coating and curing process according to claim 1, characterized in that: The curing accelerator is one or more of citric acid solution, phosphoric acid, hydrochloric acid, sulfuric acid, and tartaric acid solution.

6. The new structure melamine resin coating with convenient coating and curing process according to claim 5, characterized in that: The curing accelerator is 12 parts of citric acid solution.

7. The new structure melamine resin coating with convenient coating and curing process according to claim 1, characterized in that: The functional additive is one or more of triethyl phosphate, alkyl acrylate phosphate, 2-hydroxyethyl methacrylate phosphate, nano silicon dioxide, nano titanium dioxide, and nano zinc oxide.

8. The new structure melamine resin coating with convenient coating and curing process according to claim 1, characterized in that: The functional auxiliary agent is 2.5 parts of 2-hydroxyethyl methacrylate phosphate.

9. A method for preparing a new structure melamine resin coating with convenient coating and curing process as claimed in any one of claims 1 to 8, characterized in that: include: 392 parts of stearyl melamine, 200 parts of paraformaldehyde, 10 parts of diethanolamine and 280 parts of water were placed in a three-necked flask, heated to 100°C, and cooled to 80°C until the water tolerance point appeared. 40 parts of butanol and 60 parts of polyethylene glycol 200 were added, stirred evenly, and 1000011 The reaction was carried out for 3.0 hours to obtain a new structure acylated melamine resin; the new structure acylated melamine resin, an adhesion promoter, a curing promoter and a functional auxiliary agent were mixed according to a proportion to obtain the new structure melamine resin coating.

10. A method for using a new structure melamine resin coating with convenient coating and curing process as claimed in any one of claims 1 to 8, characterized in that: include: The new structure melamine resin coating is evenly applied on the surface of different substrates by brushing, roller coating or spraying, and is cured at a constant temperature of 60 to 120° C. for 1 to 5 hours to obtain a coating having the following performance indicators: surface adhesion ≥8.0MPa, scratch resistance ≥10N, abrasion resistance ≤0.020mg / 100 revolutions, water contact angle of 100 to 110°, stain resistance of level 5, surface crack resistance ≥48h, and surface resistance to cold and hot cycles ≥5 times.

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