Ultraviolet light absorber for environment-friendly coating

Abstract

The invention relates to the technical field of materials, and discloses an ultraviolet light absorber for an environment-friendly coating, which is prepared from the following raw materials in parts by weight: 1.3 to 2.7 parts of flatting agent, 0.5 to 0.9 part of hydrogen-containing silicone oil, 0.87 to 1.24 parts of defoaming agent, 2.45 to 6.56 parts of bisphenol A diglycidyl ether, 3.67 to 5.26 parts of water, 3.26 to 5.24 parts of disalicylate, 2.35 to 4.25 parts of benzophenone and 2.2 to 3.5 parts of dispersing wetting agent. 0.2 to 1.2 parts of an antioxidant, and comprising at least one ultraviolet absorber exhibiting ultraviolet absorption properties throughout the wavelength range of 300 to 400 nanometers, such that the article exhibits an ultraviolet transmittance of up to 10% at a wavelength of 390 nanometers, and the plastic and the rubber are effectively prevented from being degraded due to the action of heat and oxygen in the processing and using processes.

Description

Technical Field

[0001] The invention relates to the technical field of materials, in particular to an environmentally friendly ultraviolet absorber for coatings. Background Art

[0002] One of the reasons for the aging of rubber and plastic is due to the effect of ultraviolet rays. When sunlight reaches the ground, although part of it is absorbed by the ozone layer and the outer atmosphere, from its composition, there are still ultraviolet rays with a wavelength of 290-400nm. It is best for ultraviolet absorbers to completely absorb the light of the above wavelengths. When selecting absorbers, it is necessary to consider the smaller the amount, the better, high thermal stability, low volatility, and non-toxicity. However, existing ultraviolet absorbers still have some problems in actual use;

[0003] For example, application number CN201310442234.7 discloses a UV absorber for coatings, which is made of the following raw materials in parts by weight: 1.24-2.35 parts of leveling agent, 2.55-3.46 parts of silicone-modified acrylic resin, 0.45-0.86 parts of hydrogenated silicone oil, 0.46-1.24 parts of defoamer, 4.23-6.56 parts of bisphenol A diglycidyl ether, 3.67-5.26 parts of water, 3.26-5.24 parts of trimethylolpropane triacrylate, 1.35-3.25 parts of alkyd, It can effectively absorb light of ultraviolet wavelengths, and at the same time, its content in the coating is small, its thermal stability is higher than that of general products, it is non-toxic and tasteless, and it can maintain its ultraviolet absorption ability for 2-3 years after one coating. The existing ultraviolet absorbers for coatings are mainly composed of film-forming resins, light stabilizers and other additives. However, the ultraviolet absorbers currently used have poor stability. When used for a long time, as the absorber molecules decompose and volatilize, the product's anti-ultraviolet ability decreases, and it is difficult to maintain high light oxidation resistance for a long time. Moreover, when decomposed after long-term use, it also has certain toxicity.

[0004] In view of the above problems, a kind of environment-friendly ultraviolet light absorber for coating is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an environmentally friendly ultraviolet absorber for coatings. The device is used to work, thereby solving the problem that the existing ultraviolet absorbers for coatings are mainly composed of film-forming resins, light stabilizers and other additives. However, the ultraviolet absorbers currently used have poor stability. When used for a long time, as the absorber molecules decompose and volatilize, the product's ultraviolet resistance decreases, making it difficult to maintain high light oxidation resistance for a long time. Moreover, when decomposed after long-term use, it also has a certain toxicity problem.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an environmentally friendly ultraviolet absorber for coatings, composed of the following raw materials, the parts are all by weight, 1.3 to 2.7 parts of leveling agent, 0.5 to 0.9 parts of hydrogen silicone oil, 0.87 to 1.24 parts of defoaming agent, 2.45 to 6.56 parts of bisphenol A diglycidyl ether, 3.67 to 5.26 parts of water, 3.26 to 5.24 parts of disalicylate, 2.35 to 4.25 parts of benzophenone, 2.2 to 3.5 parts of dispersing wetting agent, 0.2 to 1.2 parts of antioxidant, and contains at least one ultraviolet absorber, which exhibits ultraviolet absorption characteristics over the entire wavelength range of 300 nanometers to 400 nanometers, so that the product exhibits a maximum ultraviolet transmittance of 10% at a wavelength of 390 nanometers.

[0007] Preferably, the leveling agent is composed of the following components, all of which are by weight: 3-5 parts of methyl silicone oil; 1-4 parts of polydimethylsiloxane. The use of modified acrylic leveling agents, such as fluorine-modified acrylic leveling agents and phosphate-modified acrylic leveling agents, can significantly reduce the surface tension of the coating while maintaining good substrate wettability and fluidity of the paint film.

[0008] The above-mentioned structural design is adopted, through the setting of the leveling agent, to reduce the surface tension between the coating and the substrate, so that both have good lubricity; at the same time, the viscosity is adjusted and the leveling time is extended, thereby promoting the uniform flow of liquid on the surface to form a smoother and flatter surface.

[0009] Preferably, the defoaming agent is composed of the following components, all of which are by weight: 3-5 parts of triglycerol monostearate; 1-2 parts of cyclopropane, and its main function is to change the flow properties of the liquid, increase the viscosity of the liquid, and hinder the formation and stabilization of foam.

[0010] By adopting the above-mentioned structural design, the defoaming agent can eliminate bubbles generated in the production process, reduce impurities and defects in the product, and improve production efficiency and product quality. Certain defoaming agent ingredients can promote chemical reactions, improve reaction efficiency, reduce reaction time, lower reaction temperature and pressure, etc. The defoaming agent can reduce the generation of bubbles, reduce the intensity and speed of stirring and mixing, and save energy and resources.

[0011] Preferably, the dispersing wetting agent is composed of the following components, all of which are by weight: 5-7 parts of potassium tripolyphosphate; 3-5 parts of polyacrylamide, and its main function is to improve the dispersibility of the pigment in the solvent or water, prevent the sedimentation and agglomeration of the pigment particles, thereby forming a stable suspension.

[0012] By adopting the above structural design, the dispersed wetting agent has conductivity, can be used for electrostatic spraying paint, and has a significant application effect in water-based paint and printing ink.

[0013] Preferably, the ultraviolet absorber is composed of the following components, all of which are by weight: 8-10 parts of 2-hydroxy-4-n-octyloxybenzophenone; 3-5 parts of phenyl o-hydroxybenzoate, and its main function is to absorb the ultraviolet part in sunlight or fluorescent source, convert it into heat energy or non-destructive longer light waves and release it, thereby protecting the substance added with the ultraviolet absorber from ultraviolet damage.

[0014] With the above structural design, disalicylate undergoes molecular rearrangement under ultraviolet irradiation to form a stronger ultraviolet absorption structure. These different types of ultraviolet absorbers can effectively absorb and convert ultraviolet rays of specific wavelengths according to their molecular structures and chemical compositions, protecting various materials from damage by ultraviolet rays.

[0015] Preferably, the antioxidant is composed of the following components, all of which are by weight: 2-3 parts of 2,6-di-tert-butyl-p-cresol; 0.5-1 part of aluminum oxide powder, and its main function is to protect the coating absorber from external oxidation and prevent the UV absorber from failing.

[0016] With the above structural design, the coating antioxidant can inhibit the reaction between ethylene and oxygen molecules, thereby reducing the probability of oxidation. Most antioxidants can react with free radicals and organic peroxides to form a more stable oxide, eliminating or slowing down the occurrence of oxidation reactions, thereby extending the service life of the coating.

[0017] Preferably, an environmentally friendly ultraviolet absorber for coatings is prepared by pouring the above-mentioned leveling agent, hydrogen silicone oil, defoamer, bisphenol A diglycidyl ether, water, disalicylate, benzophenone, dispersing wetting agent, antioxidant, and ultraviolet absorber into the interior of a mixer,

[0018] Step 1: Mix bisphenol A diglycidyl ether, disalicylate and water at 40 to 50 degrees Celsius, disperse by ultrasonication, add benzophenone solution dropwise, ultrasonicate for 2 hours after the addition is complete, stir for 4 hours after the ultrasonication ends, and concentrate to obtain material A;

[0019] Step 2: Mix disalicylate and acetone at 40 to 50 degrees Celsius and stir evenly, dropwise add material A, then dropwise add potassium hydroxide aqueous solution, and after the dropwise addition is completed, stir and react for 4 hours to obtain material B;

[0020] Step 3: Evenly mix potassium hydroxide solution, toluene and tetrapropylammonium bromide, raise the temperature to 70 to 80 degrees Celsius, add material B, and stir to react for 5 hours to obtain material C;

[0021] Step 4: Evenly mix 2,4-dihydroxybenzophenone, sodium hydroxide aqueous solution and acetone, add them into material C, heat to 80 to 90 degrees Celsius, stir and react for 3 hours, and after the reaction, perform post-processing to obtain the composite ultraviolet absorber.

[0022] The above-mentioned operation arrangement effectively improves the stirring preparation efficiency of the ultraviolet absorber, reduces the production cost, and expands the scope of use.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The environmentally friendly UV absorber for coating proposed in the present application solves the problem that the existing UV absorbers for coating have poor stability, and the UV resistance of the product decreases with the decomposition and volatilization of the absorber molecules during long-term use, and it is difficult to maintain high light oxidation resistance for a long time. The UV absorber for coating prepared by the present invention has higher antioxidant performance. When the dispersed wetting agent, antioxidant, and UV absorber are mixed, the composite antioxidant has higher antioxidant performance. When mixed with the antioxidant, it has a synergistic and solubilizing effect, and plays a synergistic role. 2,6-di-tert-butyl-p-cresol is used as a heat stabilizer and antioxidant. It can effectively prevent plastics and rubber from being degraded due to the action of heat and oxygen during processing and use, which is crucial to extending the service life of the product and maintaining its performance.

[0025] 2. The environmentally friendly ultraviolet absorber for coatings proposed in the present application solves the problem that the existing ultraviolet absorbers for coatings have certain toxicity when decomposed after long-term use. The residue produced by the decomposition of the ultraviolet absorber for coatings prepared by the present invention is less toxic. No substances such as formaldehyde will be produced during the remixing of disalicylate with acetone and potassium hydroxide. In addition, through the setting of 2-hydroxy-4-n-octyloxybenzophenone and phenyl o-hydroxybenzoate, the ultraviolet part in sunlight or fluorescent source is absorbed and converted into heat energy or non-destructive longer light waves for release, thereby protecting the substance added with the ultraviolet absorber from ultraviolet damage, further reducing the decomposition effect of sunlight on the coating, and greatly avoiding the occurrence of a large amount of toxins produced by decomposition and thus causing damage to the external environment.

[0026] 3. The application proposes an environmentally friendly UV absorber for coatings, which solves the problem that most of the existing UV absorbers for coatings are directly mixed during the preparation process, which may cause foaming of the absorber, greatly affecting the reaction rate. The present invention prepares an environmentally friendly UV absorber for coatings, and adds a defoamer during the preparation process, wherein the defoamer includes triglycerol monostearate and cyclopropane, which changes the flow properties of the liquid, increases the viscosity of the liquid, and hinders the formation and stability of foam. A leveling agent is also added, wherein the leveling agent includes methyl silicone oil and polydimethylsiloxane, which can significantly reduce the surface tension of the coating while maintaining good substrate wettability and paint film fluidity, and can maintain the function of adjusting the tension of the liquid and hindering the occurrence of foam formation during the preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a structural diagram of the raw material composition of the present invention;

[0029] Figure 3 It is a structural diagram of the components of the leveling agent of the present invention;

[0030] Figure 4 It is a structural diagram of the defoamer components of the present invention;

[0031] Figure 5 It is a structural diagram of the components of the dispersing wetting agent of the present invention;

[0032] Figure 6 It is a structural diagram of the components of the ultraviolet absorber of the present invention;

[0033] Figure 7 It is a structural diagram of the antioxidant components of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0036] Combination Figure 1-Figure 3, an environmentally friendly ultraviolet absorber for coatings, composed of the following raw materials, all in parts by weight, 1.3 to 2.7 parts of leveling agent, 0.5 to 0.9 parts of hydrogen silicone oil, 0.87 to 1.24 parts of defoaming agent, 2.45 to 6.56 parts of bisphenol A diglycidyl ether, 3.67 to 5.26 parts of water, 3.26 to 5.24 parts of disalicylate, 2.35 to 4.25 parts of benzophenone, 2.2 to 3.5 parts of dispersing wetting agent, 0.2 to 1.2 parts of antioxidant, and contains at least one ultraviolet absorber, which exhibits ultraviolet absorption characteristics over the entire wavelength range of 300 nanometers to 400 nanometers, so that the product exhibits a maximum ultraviolet transmittance of 10% at a wavelength of 390 nanometers.

[0037] The leveling agent is composed of the following components, all of which are by weight: 3-5 parts of methyl silicone oil; 1-4 parts of polydimethylsiloxane. The use of modified acrylic leveling agents, such as fluorine-modified acrylic leveling agents and phosphate-modified acrylic leveling agents, can significantly reduce the surface tension of the coating while maintaining good substrate wettability and fluidity of the paint film.

[0038] The defoaming agent is composed of the following components, all of which are by weight: 3-5 parts of triglycerol monostearate; 1-2 parts of cyclopropane, and its main function is to change the flow properties of the liquid, increase the viscosity of the liquid, and hinder the formation and stability of foam.

[0039] The dispersing wetting agent is composed of the following components, all of which are by weight: 5-7 parts of potassium tripolyphosphate; 3-5 parts of polyacrylamide, and its main function is to improve the dispersibility of the pigment in the solvent or water, prevent the sedimentation and agglomeration of the pigment particles, and thus form a stable suspension.

[0040] The ultraviolet absorber is composed of the following components, all of which are by weight: 8-10 parts of 2-hydroxy-4-n-octyloxybenzophenone; 3-5 parts of phenyl o-hydroxybenzoate. The main function of the ultraviolet absorber is to absorb the ultraviolet part in sunlight or fluorescent sources, convert it into heat energy or non-destructive longer light waves and release it, thereby protecting the substance added with the ultraviolet absorber from being damaged by ultraviolet rays.

[0041] The antioxidant is composed of the following components, all of which are by weight: 2-3 parts of 2,6-di-tert-butyl-p-cresol; 0.5-1 part of aluminum oxide powder, and its main function is to protect the coating absorber from external oxidation and prevent the ultraviolet absorber from becoming ineffective.

[0042] Pour the above-mentioned leveling agent, hydrogen silicone oil, defoamer, bisphenol A diglycidyl ether, water, disalicylate, benzophenone, dispersing wetting agent, antioxidant, and ultraviolet absorber into the mixer.

[0043] Step 1: Mix bisphenol A diglycidyl ether, disalicylate and water at 40 to 50 degrees Celsius, disperse by ultrasonication, add benzophenone solution dropwise, ultrasonicate for 2 hours after the addition is complete, stir for 4 hours after the ultrasonication ends, and concentrate to obtain material A;

[0044] Step 2: Mix disalicylate and acetone at 40 to 50 degrees Celsius and stir evenly, dropwise add material A, then dropwise add potassium hydroxide aqueous solution, and after the dropwise addition is completed, stir and react for 4 hours to obtain material B;

[0045] Step 3: Evenly mix potassium hydroxide solution, toluene and tetrapropylammonium bromide, raise the temperature to 70 to 80 degrees Celsius, add material B, and stir to react for 5 hours to obtain material C;

[0046] Step 4: Evenly mix 2,4-dihydroxybenzophenone, sodium hydroxide aqueous solution and acetone, add to material C, heat to 80 to 90 degrees Celsius, stir and react for 3 hours, and after the reaction, post-process to obtain a composite ultraviolet absorber.

[0047] The present invention will be further described below in conjunction with the embodiments.

[0048] Embodiment 1:

[0049] In order to solve the problem that the existing UV absorbers for coatings have poor stability, the UV resistance of the product decreases with the decomposition and volatilization of the absorber molecules during long-term use, and it is difficult to maintain high light oxidation resistance for a long time, this embodiment discloses the following technical solutions, specifically as follows Figure 1-Figure 3 As shown, the UV absorber for coating prepared by the present invention has higher antioxidant performance. When the dispersing wetting agent, antioxidant and UV absorber are mixed, the composite antioxidant has higher antioxidant performance. When mixed with the antioxidant, it has synergistic and solubilizing effects and exerts a synergistic effect. 2,6-di-tert-butyl-p-cresol is used as a heat stabilizer and antioxidant. It can effectively prevent plastics and rubber from being degraded due to heat and oxygen during processing and use, which is very important for extending the service life of the product and maintaining its performance.

[0050] At the same time, in order to solve the problem that the existing ultraviolet absorbers for coatings have certain toxicity when decomposed after long-term use, the ultraviolet absorbers for coatings prepared by the present invention have lower toxicity after decomposition, and no substances such as formaldehyde will be generated during the remixing of disalicylate, acetone and potassium hydroxide. In addition, through the setting of 2-hydroxy-4-n-octyloxybenzophenone and phenyl o-hydroxybenzoate, the ultraviolet part in sunlight or fluorescent source is absorbed and converted into heat energy or non-destructive longer light waves for release, thereby protecting the substance added with the ultraviolet absorber from ultraviolet damage, further reducing the decomposition effect of sunlight on the coating, and greatly avoiding the occurrence of a large amount of toxins produced by decomposition and thus causing damage to the external environment.

[0051] At the same time, in order to solve the problem that most of the existing ultraviolet absorbers for coatings are directly mixed during the preparation process, which may cause foaming of the absorber and greatly affect the reaction rate, the present invention prepares an environmentally friendly ultraviolet absorber for coatings, and adds a defoaming agent during the preparation process, wherein the defoaming agent includes triglycerol monostearate and cyclopropane, which changes the flow properties of the liquid, increases the viscosity of the liquid, and hinders the formation and stability of foam, and further adds a leveling agent, wherein the leveling agent includes methyl silicone oil and polydimethylsiloxane, which can significantly reduce the surface tension of the coating while maintaining good substrate wettability and paint film fluidity, and can maintain the function of adjusting the tension of the liquid and hindering the occurrence of foam formation during the preparation process.

[0052] It should be noted that the above-mentioned electrical components are equipped with power supplies and their control methods are prior art. In order to avoid redundant description, they are uniformly described here; and this application is mainly used to protect mechanical equipment, so the control method and circuit connection are no longer explained in detail. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly ultraviolet absorber for coatings, composed of the following raw materials, the parts are all by weight, 1.3 to 2.7 parts of leveling agent, 0.5 to 0.9 parts of hydrogen silicone oil, 0.87 to 1.24 parts of defoaming agent, 2.45 to 6.56 parts of bisphenol A diglycidyl ether, 3.67 to 5.26 parts of water, 3.26 to 5.24 parts of disalicylate, 2.35 to 4.25 parts of benzophenone, 2.2 to 3.5 parts of dispersing wetting agent, 0.2 to 1.2 parts of antioxidant, and contains at least one ultraviolet absorber, which exhibits ultraviolet absorption characteristics over the entire wavelength range of 300 nanometers to 400 nanometers, so that the product exhibits a maximum ultraviolet transmittance of 10% at a wavelength of 390 nanometers.

2. The environmentally friendly ultraviolet absorber for coatings according to claim 1, characterized in that: The leveling agent is composed of the following components, all of which are by weight: 3-5 parts of methyl silicone oil; 1-4 parts of polydimethylsiloxane. The use of modified acrylic leveling agents, such as fluorine-modified acrylic leveling agents and phosphate-modified acrylic leveling agents, can significantly reduce the surface tension of the coating while maintaining good substrate wettability and fluidity of the paint film.

3. The environmentally friendly ultraviolet absorber for coatings according to claim 1, characterized in that: The defoaming agent is composed of the following components, all of which are by weight: 3-5 parts of triglycerol monostearate; 1-2 parts of cyclopropane, and its main function is to change the flow properties of the liquid, increase the viscosity of the liquid, and hinder the formation and stability of foam.

4. The environmentally friendly ultraviolet absorber for coatings according to claim 1, characterized in that: The dispersing wetting agent is composed of the following components, all of which are by weight: 5-7 parts of potassium tripolyphosphate; 3-5 parts of polyacrylamide, and its main function is to improve the dispersibility of the pigment in the solvent or water, prevent the sedimentation and agglomeration of the pigment particles, and thus form a stable suspension.

5. The environmentally friendly ultraviolet absorber for coatings according to claim 1, characterized in that: The ultraviolet absorber is composed of the following components, all of which are by weight: 8-10 parts of 2-hydroxy-4-n-octyloxybenzophenone; 3-5 parts of phenyl o-hydroxybenzoate, and its main function is to absorb the ultraviolet part in sunlight or fluorescent source, convert it into heat energy or non-destructive longer light waves and release it, so as to protect the substance added with the ultraviolet absorber from being damaged by ultraviolet rays.

6. The environmentally friendly ultraviolet absorber for coatings according to claim 1, characterized in that: The antioxidant is composed of the following components, all of which are by weight: 2-3 parts of 2,6-di-tert-butyl-p-cresol; 0.5-1 part of aluminum oxide powder, and its main function is to protect the coating absorber from external oxidation and prevent the ultraviolet absorber from becoming ineffective.

7. The environmentally friendly ultraviolet absorber for coatings according to claim 1, characterized in that: Pour the above-mentioned leveling agent, hydrogen silicone oil, defoamer, bisphenol A diglycidyl ether, water, disalicylate, benzophenone, dispersing wetting agent, antioxidant, and ultraviolet absorber into the mixer. Step 1: Mix bisphenol A diglycidyl ether, disalicylate and water at 40 to 50 degrees Celsius, disperse by ultrasonication, add benzophenone solution dropwise, ultrasonicate for 2 hours after the addition is complete, stir for 4 hours after the ultrasonication ends, and concentrate to obtain material A; Step 2: Mix disalicylate and acetone at 40 to 50 degrees Celsius and stir evenly, dropwise add material A, then dropwise add potassium hydroxide aqueous solution, and after the dropwise addition is completed, stir and react for 4 hours to obtain material B; Step 3: Evenly mix potassium hydroxide solution, toluene and tetrapropylammonium bromide, raise the temperature to 70 to 80 degrees Celsius, add material B, and stir to react for 5 hours to obtain material C; Step 4: Evenly mix 2,4-dihydroxybenzophenone, sodium hydroxide aqueous solution and acetone, add them into material C, heat to 80 to 90 degrees Celsius, stir and react for 3 hours, and after the reaction, perform post-processing to obtain the composite ultraviolet absorber.

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