An anti-aging coating and a method for preparing the same

Abstract

The present application relates to anti-aging coating technical field, more specifically, it relates to a kind of anti-aging coating and preparation method thereof, it is made of film-forming material, functional ceramic powder, coupling agent, solvent, dispersing agent and curing agent.It is made by fully mixing the film-forming material, functional ceramic powder, coupling agent, solvent, dispersing agent and curing agent described above, and can be prepared after uniform dispersion anti-aging coating.The present application widens the use range of anti-aging coating, and is suitable for the surface of plastic, wood, stone and other various substrates.The coating has wide use range, is environment-friendly, has good ultraviolet aging resistance, good heat resistance, strong adhesion and other advantages, and can meet long-term outdoor use requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-aging coating, in particular to an anti-aging coating and a preparation method thereof. BACKGROUND

[0002] Hard PVC wire pipe is an important pipe material for protecting electric wires and prolonging the service life of electric wires, but under the action of sunlight ultraviolet rays for a long time, polymer molecules will be broken or photochemically degraded, which can easily cause the hard PVC wire pipe to have problems such as cracking, powdering and strength reduction, and further cause the insulating layer of electric wires to be accelerated in aging and the service life of electric wires to be reduced. Chinese patent CN 104962160A discloses an anti-ultraviolet coating composition for plastics, although the patent increases the anti-ultraviolet performance of the coating by designing a coating formula for plastics, the hardness of the coating is not enough, the mechanical properties are poor, the coating is easy to scratch and is limited to plastic substrates. Chinese patent CN 109181441A discloses an anti-aging coating, a preparation method and application in prolonging the service life of water pipes and cables, although the patent improves the anti-aging property of the coating by adjusting the coating formula, the coating has the problem of poor thermal stability leading to gel and is limited to plastic substrates. SUMMARY

[0003] The present application aims at the problems existing in the prior art, and provides an anti-aging coating and a preparation method thereof, which solve the problems of cracking, powdering and strength reduction of the hard PVC wire pipe under the action of ultraviolet rays, and the accelerated aging of the insulating layer of electric wires.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] An anti-aging coating comprises the following components by mass:

[0006]

[0007] The functional ceramic powder comprises glass fibers and anti-aging powder.

[0008] To expand the use range of the anti-aging coating and improve the mechanical and stable properties of the coating, the present application provides an anti-aging coating and a preparation method thereof, which have the advantages of wide use range, environmental friendliness, good anti-ultraviolet aging property, good heat resistance, strong adhesion and the like.

[0009] The application controls the reasonable proportion of each component in the coating, especially controls 20-30% of functional ceramic powder, the functional ceramic powder including glass fiber and anti-aging powder, cooperatively generates the effect of converting the damage of light energy such as ultraviolet light into heat energy, and cooperatively generates good barrier property and thermal conductivity by using the glass fiber and the anti-aging powder to rapidly dissipate the heat energy, thereby avoiding the adverse effects of the heat energy on the material. Meanwhile, the glass fiber also has the effect of assisting in enhancing the strength of the coating and making the coating better resist cracking.

[0010] Preferably, the mass percentage of the glass fiber in the functional ceramic powder is 3-15%.

[0011] Preferably, the diameter of the glass fiber includes 4-10 μm; and the particle size of the anti-aging powder includes 80 nm-1 μm.

[0012] As a further optimized technical solution, the glass fiber is a chopped fiber; the diameter of the glass fiber single filament is 4-10 μm, and the proportion is 3-15%, and the particle size of the anti-aging powder is 80 nm-1 μm, which can efficiently convert light energy into heat energy, and cooperatively dissipate the heat energy outside by using the glass fiber to avoid damage to the material, and simultaneously cooperatively dissipate the heat rapidly, thereby forming excellent anti-aging effect.

[0013] Preferably, the anti-aging powder includes one or more of cerium dioxide, titanium dioxide and zinc oxide.

[0014] Cerium dioxide, titanium dioxide and zinc oxide can absorb ultraviolet energy to cause electronic transition, convert harmful light energy into heat energy, thereby offsetting the damage caused by ultraviolet energy and preventing aging.

[0015] The cerium dioxide is a semiconductor material, and its electronic structure is composed of a valence band and a conduction band. The band gap of the cerium dioxide is 3.1 eV, and the energy of the ultraviolet light in the sunlight is 3.1-3.94 eV. When the energy of the ultraviolet light is greater than the band gap of the cerium dioxide, the electrons in the valence band of the cerium dioxide will absorb the ultraviolet light energy to cause electronic transition, and the absorbed ultraviolet light energy is released in the form of heat and light, thereby playing the role of absorbing ultraviolet light. At the same time, the refractive index of the cerium dioxide is 2.05, which can scatter part of the ultraviolet light. Therefore, the selection of cerium dioxide as the anti-aging powder is a relatively optimal choice.

[0016] Preferably, the film-forming material includes nano-silicon dioxide modified acrylate emulsion; the coupling agent includes a mixture of water-soluble titanate and silane coupling agent; the dispersing agent includes one or more of sodium polyacrylate, carboxymethyl cellulose and hydroxyethyl cellulose; and the curing agent includes ethylene glycol dimethacrylate.

[0017] As a further optimized technical solution, the film-forming material is nano-silica modified acrylate emulsion. It has good anti-UV aging property, is friendly to the environment, and the like, and further cooperates with the functional ceramic powder to jointly act on the anti-UV aging property of the film-forming material, thereby achieving excellent anti-aging effect and playing a role of high-efficiency anti-aging.

[0018] As a further optimized technical solution, the dispersant is carboxymethyl cellulose. The carboxymethyl cellulose is used to uniformly disperse the anti-aging powder particles to form a stable coating system which is not easy to be separated into layers.

[0019] As a further optimized technical solution, the curing agent is ethylene glycol dimethacrylate. The ethylene glycol dimethacrylate is used to cross-link the film-forming material acrylate emulsion to achieve ideal curing of the emulsion.

[0020] Preferably, in the coupling agent, the mass ratio of the water-soluble titanate to the silane coupling agent is 1:1.

[0021] Preferably, the water-soluble titanate includes a chelate solution of diethylenetriamine titanate and triethanolamine; and the silane coupling agent includes aminopropyltrimethoxysilane.

[0022] As a further optimized technical solution, the water-soluble titanate is a chelate solution of diethylenetriamine titanate and triethanolamine. The chelate solution can increase the filling amount of the inorganic filler and increase the adhesion between the coating and the inorganic substrate.

[0023] The anti-aging coating of the present application uses silica modified acrylate emulsion as a film-forming material to form an organic-inorganic composite system. The functional ceramic powder endows the coating with anti-aging and enhanced toughening and the like. By increasing the content of the anti-aging particles in the coating and further introducing glass fibers, the heat insulation and mechanical properties of the coating are improved, the anti-UV aging ability of the organic coating is effectively improved, and the poor anti-aging performance of the PVC plastic pipe substrate is solved. By using a mixed water-soluble titanate and a silane coupling agent binder, the adhesion between the coating and the substrate is improved, and the use range of the anti-aging coating is widened, which is suitable for various substrates such as plastic, wood and stone. The coating has the advantages of wide use range, environmental friendliness, good anti-UV aging property, good heat resistance, strong adhesion and the like, and can meet the long-term outdoor use requirements.

[0024] A preparation process of the anti-aging coating as described above comprises the following steps:

[0025] (1) adding triethanolamine dropwise to diethylenetriamine titanate to fully react to obtain a quaternary ammonium salt solution;

[0026] (2) continuously adding deionized water to the quaternary ammonium salt solution to react to obtain a water-soluble titanate;

[0027] (3) mixing water-soluble titanate with silane coupling agent to obtain the coupling agent;

[0028] (4) uniformly mixing the film-forming material, the functional ceramic powder, the coupling agent, the solvent, the dispersant and the curing agent in proportion, and then dispersing to obtain the anti-aging coating.

[0029] Preferably, the method comprises the following steps: step (1) and step (2) are carried out in a three-necked flask, the mass ratio of diethylenetriamine titanate to triethanolamine is 3:1, and the mass ratio of triethanolamine to deionized water is 3:4; in step (4), the mixture is re-dispersed in a high-speed disperser.

[0030] Preferably, in step (1), the reaction temperature is room temperature, and the reaction time is 1-2 h; in step (2), the reaction temperature is room temperature, and the reaction time is 2-3 h; in step (4), the dispersing speed of the high-speed disperser is 350-1600 rpm, and the time is 70-110 min.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The anti-aging coating provided by the present application uses a silica-modified acrylate emulsion as a film-forming material, forming an organic-inorganic composite system, which not only improves the water resistance and thermal stability of the acrylate emulsion, but also increases the content of anti-aging nanoparticles in the coating, thereby improving the ultraviolet aging resistance of the coating. By adding short glass fibers, the heat resistance and mechanical properties of the coating are improved; by mixing water-soluble titanate with silane coupling agent, the water-soluble titanate provides long hydrocarbon entanglement and reacts with the hydroxyl groups on the surface of the inorganic substrate to form a polymer network at the interface; the hydrolyzable silicon functional groups in the silane coupling agent form hydrogen bonds with the hydroxyl groups on the surface of the inorganic material, and form covalent bonds with the inorganic substrate under drying and curing conditions; at the same time, the functional groups on the surface of the organic polymer form hydrogen bonds with the organic functional groups on the surface of the inorganic material treated with silane; the use of adhesion aids has a synergistic effect, improving the wettability and compatibility of the coating, and widening the application range of the coating, such as plastics, wood, stone, etc.

[0033] The anti-aging powder such as nano-titanium dioxide, nano-zinc oxide, nano-cerium dioxide and the like scatters part of the ultraviolet light into the polymer material, and absorbs part of the ultraviolet light energy through electron transition, cooperates with the heat insulation of the short glass fiber, and cooperates to generate better heat conduction characteristics than plastic pipes, so that the energy can be quickly dissipated in the form of heat. The synergistic effect of the anti-aging powder and the glass fiber efficiently converts and dissipates the ultraviolet light energy in the form of heat energy, and can greatly improve the anti-ultraviolet aging property of the coating. The coating has the advantages of wide application range, environmental friendliness, good anti-ultraviolet aging property, strong adhesion and the like, and can meet the long-term outdoor use requirements. DETAILED DESCRIPTION

[0034] In order to make the technical scheme of the present application easier to understand, the present application will be further described in detail below with specific examples, so that those skilled in the art can better understand and implement the present application, but the examples are not limiting to the present application. Any modification or replacement of the method, step or condition of the present application without departing from the spirit and essence of the present application shall fall within the scope of the present application. If not specifically indicated, the technical means used in the examples is the conventional means familiar to those skilled in the art.

[0035] Example 1

[0036] According to 100 parts of the coating material, 46 parts of silica modified acrylate emulsion, 14 parts of titanium dioxide powder, 13 parts of cerium dioxide powder, 3 parts of glass fiber, 2 parts of water-soluble titanate, 2 parts of aminopropyl trimethoxysilane, 10 parts of deionized water, 2 parts of carboxymethyl cellulose and 8 parts of ethylene glycol dimethyl acrylate are added.

[0037] A preparation method of an anti-aging coating comprises the following steps:

[0038] (a) At room temperature, diethylenetriamine titanate is added to a three-necked flask, and triethanolamine is added dropwise to the three-necked flask, and fully reacted;

[0039] (b) After the quaternary ammonium salt is generated by the reaction, deionized water is continuously added to the three-necked flask, and reacted at room temperature for a period of time to obtain a water-soluble titanate;

[0040] (c) The silica modified acrylate emulsion, titanium dioxide and cerium dioxide, glass fiber, water-soluble titanate and silane coupling agent, deionized water, carboxymethyl cellulose, ethylene glycol dimethyl acrylate are fully mixed, and uniformly dispersed at 500 rpm for 100 min to obtain the anti-aging coating;

[0041] (d) The prepared anti-aging coating is sprayed on the surface of the wood substrate by pressure spraying process, and the coating thickness reaches 2 mm.

[0042] Example 2

[0043] According to the calculation of 100 parts of coating material, 50 parts of silica modified acrylate emulsion, 12 parts of titanium dioxide powder, 9 parts of cerium dioxide powder, 2 parts of glass fiber, 4 parts of water-soluble titanate, 4 parts of aminopropyl trimethoxysilane, 9 parts of deionized water, 3 parts of carboxymethyl cellulose and 7 parts of ethylene glycol dimethacrylate.

[0044] A preparation method of an anti-aging coating comprises the following steps:

[0045] (a) At room temperature, diethylenetriamine titanate is added to a three-necked flask, and triethanolamine is added dropwise to the three-necked flask for sufficient reaction;

[0046] (b) After the reaction is completed to generate a quaternary ammonium salt, deionized water is continuously added to the three-necked flask, and the reaction is carried out at room temperature for a period of time to obtain a water-soluble titanate;

[0047] (c) The silica modified acrylate emulsion, titanium dioxide and cerium dioxide, glass fiber, water-soluble titanate and silane coupling agent, deionized water, carboxymethyl cellulose and ethylene glycol dimethacrylate are fully mixed, and then uniformly dispersed at 700 rpm for 70 minutes to obtain the anti-aging coating;

[0048] (d) The prepared anti-aging coating is sprayed on the surface of a stone substrate by a pressure spraying process, and the coating thickness reaches 2 mm.

[0049] Example 3

[0050] According to the calculation of 100 parts of coating material, 50 parts of silica modified acrylate emulsion, 12 parts of titanium dioxide powder, 9 parts of cerium dioxide powder, 2 parts of glass fiber, 4 parts of water-soluble titanate, 4 parts of aminopropyl trimethoxysilane, 9 parts of deionized water, 3 parts of carboxymethyl cellulose and 7 parts of ethylene glycol dimethacrylate.

[0051] A preparation method of an anti-aging coating comprises the following steps:

[0052] (a) At room temperature, diethylenetriamine titanate is added to a three-necked flask, and triethanolamine is added dropwise to the three-necked flask for sufficient reaction;

[0053] (b) After the reaction is completed to generate a quaternary ammonium salt, deionized water is continuously added to the three-necked flask, and the reaction is carried out at room temperature for a period of time to obtain a water-soluble titanate;

[0054] (c) The silica modified acrylate emulsion, titanium dioxide and cerium dioxide, glass fiber, water-soluble titanate and silane coupling agent, deionized water, carboxymethyl cellulose and ethylene glycol dimethacrylate are fully mixed, and then uniformly dispersed at 700 rpm for 70 minutes to obtain the anti-aging coating;

[0055] (d) The prepared anti-aging coating is sprayed on the surface of the plastic substrate by pressure spraying process, and the coating thickness reaches 2 mm.

[0056] Example 4

[0057] The silica-modified acrylate emulsion 60 parts, titanium dioxide powder 14 parts, cerium dioxide powder 3 parts, glass fiber 3 parts, water-soluble titanate 2 parts, aminopropyl trimethoxysilane 2 parts, deionized water 8 parts, carboxymethyl cellulose 2 parts and ethylene glycol dimethacrylate 6 parts are calculated based on 100 parts of coating material.

[0058] A preparation method of an anti-aging coating includes the following steps:

[0059] (a) At room temperature, diethylenetriamine titanate is added to a three-necked flask, and triethanolamine is added dropwise to the three-necked flask, and fully reacted;

[0060] (b) After the reaction is completed to generate quaternary ammonium salt, deionized water is continuously added to the three-necked flask, and reacted at room temperature for a period of time to obtain a self-made water-soluble titanate;

[0061] (c) The silica-modified acrylate emulsion, titanium dioxide and cerium dioxide, glass fiber, water-soluble titanate and silane coupling agent, deionized water, carboxymethyl cellulose, ethylene glycol dimethacrylate are fully mixed, and uniformly dispersed at 800 rpm for 75 min to obtain an anti-aging coating;

[0062] (d) The prepared anti-aging coating is sprayed on the surface of the plastic substrate by pressure spraying process, and the coating thickness reaches 2 mm.

[0063] Comparative Example 1

[0064] Effect test of coating without adding anti-aging powder

[0065] The silica-modified acrylate emulsion 60 parts, glass fiber 3 parts, water-soluble titanate 2 parts, aminopropyl trimethoxysilane 2 parts, deionized water 8 parts, carboxymethyl cellulose 2 parts and ethylene glycol dimethacrylate 6 parts are calculated based on 100 parts of coating material.

[0066] A preparation method of an anti-aging coating includes the following steps:

[0067] (a) At room temperature, diethylenetriamine titanate is added to a three-necked flask, and triethanolamine is added dropwise to the three-necked flask, and fully reacted;

[0068] (b) After the reaction is completed to generate quaternary ammonium salt, deionized water is continuously added to the three-necked flask, and reacted at room temperature for a period of time to obtain a self-made water-soluble titanate;

[0069] (c) mixing the silica-modified acrylate emulsion, titanium dioxide, cerium dioxide, glass fiber, water-soluble titanate, silane coupling agent, deionized water, carboxymethyl cellulose, and ethylene glycol dimethacrylate, uniformly dispersing at 650 rpm for 70 min to obtain an anti-aging coating;

[0070] (d) spraying the prepared anti-aging coating on the surface of the plastic substrate by pressure spraying process, and the coating thickness reaches 2 mm.

[0071] Comparative Example 2

[0072] Coating test results without adding adhesion aids

[0073] The silica-modified acrylate emulsion 46 parts, titanium dioxide 14 parts, cerium dioxide 13 parts, glass fiber 3 parts, deionized water 10 parts, carboxymethyl cellulose 2 parts, and ethylene glycol dimethacrylate 8 parts.

[0074] A preparation method of an anti-aging coating includes the following steps:

[0075] (a) mixing the silica-modified acrylate emulsion, titanium dioxide, cerium dioxide, glass fiber, deionized water, carboxymethyl cellulose, and ethylene glycol dimethacrylate, uniformly dispersing at 650 rpm for 85 min to obtain an anti-aging coating;

[0076] (b) spraying the prepared anti-aging coating on the surface of the wood substrate by pressure spraying process, and the coating thickness reaches 2 mm.

[0077] Comparative Example 3

[0078] Coating test results without adding glass fiber

[0079] According to 100 parts of coating material, the silica-modified acrylate emulsion 50 parts, titanium dioxide powder 18 parts, cerium dioxide powder 6 parts, water-soluble titanate 4 parts, aminopropyl trimethoxysilane 4 parts, deionized water 8 parts, carboxymethyl cellulose 2 parts, and ethylene glycol dimethacrylate 6 parts.

[0080] A preparation method of an anti-aging coating and a coating preparation method include the following steps:

[0081] (a) at room temperature, adding diethylenetriamine titanate into a three-necked flask, and then adding triethanolamine dropwise into the three-necked flask, and fully reacting;

[0082] (b) after the reaction is completed to generate a quaternary ammonium salt, continuing to add deionized water into the three-necked flask, and reacting at room temperature for a period of time to obtain a self-made water-soluble titanate;

[0083] (c) mixing the silica modified acrylate emulsion, titanium dioxide and cerium dioxide, water-soluble titanate and silane coupling agent, deionized water, carboxymethyl cellulose, ethylene glycol dimethacrylate, uniformly dispersing at 650 rpm for 70 min to obtain an anti-aging coating;

[0084] (d) spraying the prepared anti-aging coating on the surface of the plastic substrate by pressure spraying process, and the coating thickness reaches 2 mm.

[0085] Example 1

[0086] The samples of Examples 1-4 and Comparative Examples 1-3 were tested, and the test results are as follows:

[0087] Table 1 Comparison of properties of each coating

[0088]

[0089] From Table 1, it can be analyzed that the preparation method and coating method of Comparative Example 1 are similar to Example 4, both of which use silica modified acrylate emulsion, but Comparative Example 1 lacks titanium dioxide and cerium dioxide anti-aging powder, so the ultraviolet shielding rate value is lower, and it is easy to age quickly under the action of ultraviolet light.

[0090] The preparation method and coating method of Comparative Example 2 are similar to Example 1, both of which use silica modified acrylate emulsion and titanium dioxide and cerium dioxide anti-aging powder, but Comparative Example 2 does not use water-soluble titanate and aminopropyl trimethoxysilane adhesion aid, so the adhesion of the coating on the wood substrate is not strong, and it is only limited to the coating of plastic products.

[0091] The preparation method and coating method of Comparative Example 3 are similar to Example 3, both of which use silica modified acrylate emulsion and titanium dioxide and cerium dioxide anti-aging powder, but Comparative Example 3 does not use glass fiber, so the coating will crack on the plastic substrate at high temperature, the coating has poor heat resistance, and cannot protect the plastic substrate.

[0092] The UV shielding rate of the comparative example 1 is far less than that of the coating of the present application. The present application forms an organic-inorganic composite system by simultaneously adding nano titanium dioxide, nano zinc oxide and nano cerium dioxide into the silica acrylate emulsion, and adds short glass fibers to improve the heat insulation and mechanical properties of the coating, and to improve the anti-UV aging ability of the coating. By mixing water-soluble titanate and silane coupling agent adhesion aids, the adhesion of the coating to the substrate is improved, and the use range of the anti-aging coating is expanded, including plastics, wood, stone and the like. The coating has the performance characteristics of wide use range, environmental friendliness, good anti-UV aging property, strong adhesion and the like, and can effectively inhibit the aging phenomenon of the hard PVC wire tube under room temperature and strong light.

[0093] The above only discloses preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application, so equivalent changes made according to the claims of the present application, such as using ceramic fibers instead of glass fibers, still fall within the scope of the present application.

Claims

1. An anti-aging coating, characterized in that, The components include the following parts by weight: Film-forming material 40-60%, Functional ceramic powder 20-30%, Coupling agent 4-8%, Solvent 8~10%, Dispersant 2-4%, Hardener 6~8%; The functional ceramic powder is composed of glass fiber and anti-aging powder; the glass fiber accounts for 3-15% of the mass percentage of the functional ceramic powder; the anti-aging powder includes one or more of nano-cerium dioxide, nano-titanium dioxide, and nano-zinc oxide; the film-forming material is nano-silica modified acrylate emulsion; the coupling agent is a mixture of water-soluble titanate and silane coupling agent.

2. The anti-aging coating as described in claim 1, characterized in that, The diameter of the glass fiber is 4~10μm; the particle size of the anti-aging powder is 80nm~1μm.

3. The anti-aging coating as described in claim 1, characterized in that, The dispersant includes one or more of sodium polyacrylate, carboxymethyl cellulose, and hydroxyethyl cellulose; the curing agent includes ethylene glycol dimethacrylate.

4. The anti-aging coating as described in claim 1, characterized in that, In the coupling agent, the mass ratio of the water-soluble titanate ester to the silane coupling agent is 1:

1.

5. The anti-aging coating as described in claim 1, characterized in that, The water-soluble titanate comprises a chelate solution of diethylene diethylene titanate and triethanolamine; the silane coupling agent comprises aminopropyltrimethoxysilane.

6. A preparation process for the anti-aging coating as described in claim 1, characterized in that, Includes the following steps: (1) Triethanolamine was added dropwise to diethylene titanate and allowed to react completely to obtain a quaternary ammonium salt solution; (2) Deionized water is added to the quaternary ammonium salt solution to obtain water-soluble titanate ester; (3) The water-soluble titanate ester is mixed with the silane coupling agent to obtain the coupling agent; (4) The film-forming material, the functional ceramic powder, the coupling agent, the solvent, the dispersant and the curing agent are mixed evenly in proportion and then dispersed to obtain the anti-aging coating.

7. The preparation process of the anti-aging coating as described in claim 6, characterized in that, The process includes the following steps: Steps (1) and (2) are carried out in a three-necked flask, the mass ratio of the diethylene ditene titanate to the triethanolamine is 3:1, and the mass ratio of the triethanolamine to the deionized water is 3:4; in step (4), the mixture is redispersed in a high-speed disperser.

8. The preparation process of the anti-aging coating as described in claim 7, characterized in that, In step (1), the reaction temperature is room temperature and the reaction time is 1-2h; in step (2), the reaction temperature is room temperature and the reaction time is 2-3h; in step (4), the dispersion speed of the high-speed disperser is 350-1600rpm and the time is 70-110min.

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