Environment-friendly paint and preparation method thereof

Abstract

The invention relates to the technical field of paint, and discloses environment-friendly paint and a preparation method thereof.The environment-friendly paint is prepared from phenyl acrylate, styrene, lauryl methacrylate, tert-butyl acrylate, anti-fouling and anti-corrosion cellulose, coumaric acid modified polyether, absolute ethyl alcohol, an initiator, a simethicone defoaming agent and a polyurethane flatting agent; the anti-fouling and anti-corrosion cellulose and coumaric acid modified polyether are prepared to participate in the preparation process of the paint matrix, so that the prepared environment-friendly paint has excellent anti-fouling and anti-corrosion capability, is high in toughness and not easy to damage, also has an excellent anti-oxidation effect, can meet the use requirements in various environments, and has a wide application prospect. And even if used for a long time, the device does not need to be replaced frequently, thereby saving cost and having long service life.

Description

Technical Field

[0001] The invention relates to the technical field of paints, and in particular to an environmentally friendly paint and a preparation method thereof. Background Art

[0002] As an important part of the coatings industry, paint is widely used in many fields such as construction, furniture, automobiles, mechanical engineering, etc., playing a protective and aesthetic role. However, with the development of science and technology, the disadvantages of traditional paints have gradually emerged. In actual use, the anti-fouling and anti-corrosion capabilities of traditional paints are obviously insufficient, especially in harsh environments such as high humidity, high salt and high pollution. Traditional paints have weak protective capabilities and are prone to coating peeling and rusting, losing their protective effect on the base material. In addition, most traditional paints have weak antioxidant properties, are easily oxidized, and have poor durability. Therefore, when using traditional paints, the paint coating needs to be replaced frequently, which not only increases the cost of use, but also easily damages the base material during frequent replacement and polishing of the coating, causing unnecessary losses. Especially in recent years, with the introduction of environmental protection concepts, non-environmentally friendly solvents such as benzene used in traditional paints have been difficult to adapt to the needs of green development at this stage.

[0003] Therefore, the patent with publication number CN110218497B discloses a corrosion-resistant water-based paint and its preparation process, which solves the problem that the overall application effect of water-based paint is poor due to its poor salt water corrosion resistance. The corrosion-resistant water-based paint prepared by the invention has good corrosion resistance and toughness, is environmentally friendly and has low pollution, and has good application effect as a whole. However, the corrosion-resistant water-based paint prepared by the patent has general antioxidant capacity, and the coating may be frequently replaced in actual use, which is not conducive to the protection of the base material and increases the cost of use. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly paint and a preparation method thereof, which solves the following technical problems: (1) the anti-fouling and anti-corrosion performance of ordinary paint needs to be improved; (2) the antioxidant capacity of ordinary paint is average and the service life is short; (3) ordinary paint uses non-environmentally friendly solvents as dispersants, which is not friendly to the environment.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An environmentally friendly paint comprises the following raw materials in parts by weight: 25-30 parts of phenyl acrylate, 20-25 parts of styrene, 15-20 parts of lauryl methacrylate, 10-15 parts of tert-butyl acrylate, 12-15 parts of antifouling and anticorrosion cellulose, 8-10 parts of coumaric acid modified polyether, 100-150 parts of anhydrous ethanol, 8-10 parts of initiator, 3-5 parts of dimethyl silicone oil defoamer, and 2-3 parts of polyurethane leveling agent; the antifouling and anticorrosion cellulose is prepared by reacting organic fluorine-modified bacterial cellulose with pentaerythritol triacrylate; the organic fluorine-modified bacterial cellulose is prepared by reacting bacterial cellulose with tetrafluorophthalic anhydride; and the coumaric acid modified polyether is prepared by reacting allyl alcohol polyether with coumaric acid.

[0006] Furthermore, the initiator is any one of benzoyl peroxide, dicumyl peroxide, and tert-butyl perbenzoate.

[0007] Furthermore, the method for preparing the anti-fouling and anti-corrosion cellulose comprises the following steps: S1: Mix bacterial cellulose and butanone, introduce nitrogen, add tetrafluorophthalic anhydride, raise the temperature to 65-70°C and react for 5-8h. After the reaction is completed, remove the solvent by distillation under reduced pressure, and collect the product to obtain organic fluorine-modified bacterial cellulose; S2: placing the organic fluorine-modified bacterial cellulose in N-methylpyrrolidone, fully mixing and stirring, adding pentaerythritol triacrylate and a catalyst, raising the temperature to 90-100°C to react for 6-8h, and after the reaction is completed, removing the solvent by vacuum distillation, and collecting the product to obtain anti-fouling and anti-corrosion cellulose.

[0008] In this scheme, under a nitrogen atmosphere, the hydroxyl group in the bacterial cellulose structure reacts with the anhydride group in the tetrafluorophthalic anhydride structure to obtain organic fluorine-modified bacterial cellulose; then, under the action of a catalyst, the carboxyl group in the organic fluorine-modified bacterial cellulose structure reacts with the hydroxyl group in the pentaerythritol triacrylate structure to obtain antifouling and anticorrosion cellulose. This antifouling and anticorrosion cellulose uses bacterial cellulose as a polymer skeleton, which can effectively enhance the toughness of the environmentally friendly paint film and make it difficult to crack. The introduction of low-surface-energy organic fluorine in its structure can effectively enhance the antifouling and anticorrosion capabilities of the environmentally friendly paint, so that it can remain clean and easy to clean even in an environment surrounded by oil pollution, and can block the invasion of corrosive media, so that it can be used in an environment where corrosive media exist, greatly expanding the use of paint. At the same time, this antifouling and anticorrosion cellulose structure also has multiple olefin groups, which can participate in the preparation process of the paint matrix material, produce a cross-linking reaction with the matrix material, and form a three-dimensional network structure, further enhancing the toughness of the paint film and the anticorrosion and antifouling capabilities.

[0009] Furthermore, in step S2, the catalyst is any one of p-toluenesulfonic acid and aminobenzenesulfonic acid.

[0010] Furthermore, the preparation method of the coumaric acid modified polyether comprises the following steps: Allyl alcohol polyether and coumaric acid are placed in N,N-dimethylformamide, fully mixed and stirred, and then p-toluenesulfonic acid is added. The temperature is raised to react, and the solvent is removed by distillation under reduced pressure. The product is collected to obtain coumaric acid modified polyether.

[0011] In this scheme, the hydroxyl group in the allyl alcohol polyether structure reacts with the carboxyl group in the coumaric acid structure under the action of p-toluenesulfonic acid to obtain coumaric acid modified polyether. The coumaric acid modified polyether uses allyl alcohol polyether as a polymer skeleton, and has multiple ether bonds in its structure, which can effectively enhance the adhesion between the paint and the base material. Coumaric acid, as a phenolic acid antioxidant, can scavenge free radicals and inhibit the activity of enzymes that produce free radicals, and has excellent antioxidant capacity. It is chemically bonded to the polymer skeleton of allyl alcohol polyether, which can protect coumaric acid and prevent the migration of coumaric acid small molecules during long-term use. At the same time, the alkenyl group in the coumaric acid modified polyether structure can participate in the free radical polymerization process of the paint base material, further protecting the small molecule effective components in its structure, so that it can exert excellent antioxidant effects for a long time and significantly extend the service life of the paint.

[0012] Furthermore, the temperature of the temperature-raising reaction is 95-105° C., and the time is 5-6 hours.

[0013] A method for preparing an environmentally friendly paint comprises the following steps: Step 1: placing phenyl acrylate, styrene, lauryl methacrylate, tert-butyl acrylate, antifouling and anticorrosion cellulose, and coumaric acid-modified polyether in anhydrous ethanol, adding an initiator, heating to 50-55° C., and fully stirring to obtain an environmentally friendly paint base material; Step 2: Add dimethyl silicone oil defoamer and polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

[0014] Furthermore, in step 1, the rotation speed of the sufficient stirring is 200-300 r / min, and the time is 6-8 h.

[0015] Beneficial effects of the present invention: By preparing anti-fouling and anti-corrosion cellulose and coumaric acid modified polyether and participating in the preparation process of environmentally friendly paint, the prepared environmentally friendly paint has excellent anti-fouling and anti-corrosion capabilities, is not easy to be damaged, and also has excellent antioxidant effects. It can meet the use requirements in a variety of environments and has a long service life.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 The figure is a flow chart of the preparation of the environmentally friendly paint of the present invention. DETAILED DESCRIPTION

[0019] 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.

[0020] The preparation methods of the coumaric acid modified polyether and antifouling and anticorrosion cellulose in the following examples and comparative examples of the present invention are as follows: 1. Preparation of coumaric acid modified polyether 4 g of allyl alcohol polyether and 3.8 g of coumaric acid were placed in 60 ml of N,N-dimethylformamide, and after thorough mixing and stirring, 0.6 g of p-toluenesulfonic acid was added, and the temperature was raised to 95°C for reaction for 5 h. The solvent was removed by vacuum distillation, and the product was collected to obtain coumaric acid modified polyether.

[0021] 2. Preparation of antifouling and anticorrosion cellulose S1: 3.5 g of bacterial cellulose was mixed with 80 ml of butanone, nitrogen was introduced, 3.2 g of tetrafluorophthalic anhydride was added, the temperature was raised to 65°C and the reaction was carried out for 5 h. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the product was collected to obtain organic fluorine-modified bacterial cellulose; S2: Place 3.8 g of organic fluorine-modified bacterial cellulose in 100 ml of N-methylpyrrolidone, mix and stir thoroughly, then add 2.5 g of pentaerythritol triacrylate and 0.5 g of p-toluenesulfonic acid, raise the temperature to 90°C and react for 6 hours. After the reaction is completed, remove the solvent by distillation under reduced pressure and collect the product to obtain anti-fouling and anti-corrosion cellulose. Example 1

[0022] Preparation method of environmentally friendly paint Step 1: put 25 parts of phenyl acrylate, 20 parts of styrene, 15 parts of lauryl methacrylate, 10 parts of tert-butyl acrylate, 12 parts of antifouling and anticorrosion cellulose, and 8 parts of coumaric acid modified polyether in 100 parts of anhydrous ethanol, add 8 parts of benzoyl peroxide, heat to 50° C., and stir at a speed of 200 r / min for 6 hours to obtain an environmentally friendly paint base material; Step 2: Add 3 parts of dimethyl silicone defoamer and 2 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint. Example 2

[0023] Preparation method of environmentally friendly paint Step 1: 28 parts of phenyl acrylate, 23 parts of styrene, 18 parts of lauryl methacrylate, 13 parts of tert-butyl acrylate, 13 parts of antifouling and anticorrosion cellulose, and 9 parts of coumaric acid modified polyether are placed in 120 parts of anhydrous ethanol, 9 parts of diisopropylbenzene peroxide are added, the temperature is raised to 53° C., and the mixture is stirred at a speed of 250 r / min for 7 hours to obtain an environmentally friendly paint base material; Step 2: Add 4 parts of dimethyl silicone defoamer and 2.5 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint. Example 3

[0024] Preparation method of environmentally friendly paint Step 1: 30 parts of phenyl acrylate, 25 parts of styrene, 20 parts of lauryl methacrylate, 15 parts of tert-butyl acrylate, 15 parts of antifouling and anticorrosion cellulose, and 10 parts of coumaric acid modified polyether are placed in 150 parts of anhydrous ethanol, 10 parts of tert-butyl peroxybenzoate are added, the temperature is raised to 55° C., and the mixture is stirred at a speed of 300 r / min for 8 hours to obtain an environmentally friendly paint base material; Step 2: Add 5 parts of dimethyl silicone oil defoamer and 3 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

[0025] Comparative Example 1 Preparation method of environmentally friendly paint Step 1: 28 parts of phenyl acrylate, 23 parts of styrene, 18 parts of lauryl methacrylate, 13 parts of tert-butyl acrylate, and 9 parts of coumaric acid-modified polyether are placed in 120 parts of anhydrous ethanol, 9 parts of diisopropylbenzene peroxide are added, the temperature is raised to 53° C., and stirred at a speed of 250 r / min for 7 hours to obtain an environmentally friendly paint base material; Step 2: Add 4 parts of dimethyl silicone defoamer and 2.5 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

[0026] Comparative Example 2 Preparation method of environmentally friendly paint Step 1: Place 28 parts of phenyl acrylate, 23 parts of styrene, 18 parts of lauryl methacrylate, 13 parts of tert-butyl acrylate, and 13 parts of antifouling and anticorrosion cellulose in 120 parts of anhydrous ethanol, add 9 parts of diisopropylbenzene peroxide, heat to 53° C., and stir at a speed of 250 r / min for 7 hours to obtain an environmentally friendly paint base material; Step 2: Add 4 parts of dimethyl silicone defoamer and 2.5 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

[0027] Comparative Example 3 Preparation method of environmentally friendly paint Step 1: Place 28 parts of phenyl acrylate, 23 parts of styrene, 18 parts of lauryl methacrylate, and 13 parts of tert-butyl acrylate in 120 parts of anhydrous ethanol, add 9 parts of diisopropylbenzene peroxide, heat to 53° C., and stir at a speed of 250 r / min for 7 hours to obtain an environmentally friendly paint base material; Step 2: Add 4 parts of dimethyl silicone defoamer and 2.5 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

[0028] Comparative Example 4 Preparation method of environmentally friendly paint Step 1: 28 parts of phenyl acrylate, 23 parts of styrene, 18 parts of lauryl methacrylate, 13 parts of tert-butyl acrylate, 13 parts of organic fluorine-modified bacterial cellulose, and 9 parts of coumaric acid-modified polyether are placed in 120 parts of anhydrous ethanol, 9 parts of diisopropylbenzene peroxide are added, the temperature is raised to 53° C., and the mixture is stirred at a speed of 250 r / min for 7 hours to obtain an environmentally friendly paint base material; Step 2: Add 4 parts of dimethyl silicone defoamer and 2.5 parts of polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

[0029] Performance Testing The environmentally friendly paints prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were applied to steel plates that met the specifications, and samples were prepared after curing. The samples were subjected to an adhesion grade test according to the reference standard GB / T1727-2021; the samples were subjected to a salt spray resistance test according to the reference standard GB / T1771-2007 to determine the corrosion resistance of the samples, and a water contact angle test was performed on the samples using a PZ-200SD contact angle tester to determine the antifouling ability of the samples; the samples were placed in an aging box at 80°C for 72 hours to observe whether the samples were bubbling, warping, or even falling off, and to determine the antioxidant capacity of the samples. The specific test results are shown in the table below:

[0030] It can be seen from the above table that the samples prepared in Examples 1 to 3 all have excellent adhesion, anti-corrosion and anti-fouling capabilities, and antioxidant effects. In the sample prepared in Comparative Example 1, no anti-fouling and anti-corrosion cellulose was added, and the anti-fouling and anti-corrosion capabilities were poor, but coumaric acid modified polyether was added thereto, so the sample had excellent antioxidant ability. In the sample prepared in Comparative Example 2, no coumaric acid modified polyether was added, and the antioxidant ability was poor, but anti-fouling and anti-corrosion cellulose was added thereto, so the anti-fouling and anti-corrosion capabilities were strong. In the sample prepared in Comparative Example 3, neither anti-fouling and anti-corrosion cellulose nor coumaric acid modified polyether was added, so the adhesion, anti-fouling and anti-corrosion capabilities, and antioxidant capabilities of the sample were poor. In the sample prepared in Comparative Example 4, organic fluorine-modified cellulose and coumaric acid modified polyether were directly added, and the adhesion, anti-fouling and anti-corrosion capabilities, and antioxidant capabilities were good, but not as good as the embodiments, because the directly added organic fluorine-modified cellulose structure does not have multiple olefin groups, and cannot generate a cross-linked network structure with the paint matrix to enhance the density.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. An environmentally friendly paint, characterized in that: The invention comprises the following raw materials in parts by weight: 25-30 parts of phenyl acrylate, 20-25 parts of styrene, 15-20 parts of lauryl methacrylate, 10-15 parts of tert-butyl acrylate, 12-15 parts of antifouling and anticorrosion cellulose, 8-10 parts of coumaric acid modified polyether, 100-150 parts of anhydrous ethanol, 8-10 parts of initiator, 3-5 parts of dimethyl silicone oil defoamer, and 2-3 parts of polyurethane leveling agent; the antifouling and anticorrosion cellulose is prepared by reacting organic fluorine-modified bacterial cellulose with pentaerythritol triacrylate; the organic fluorine-modified bacterial cellulose is prepared by reacting bacterial cellulose with tetrafluorophthalic anhydride; and the coumaric acid modified polyether is prepared by reacting allyl alcohol polyether with coumaric acid.

2. The environmentally friendly paint according to claim 1, characterized in that: The initiator is any one of benzoyl peroxide, dicumyl peroxide and tert-butyl perbenzoate.

3. The environmentally friendly paint according to claim 1, characterized in that: The method for preparing the antifouling and anticorrosion cellulose comprises the following steps: S1: Mix bacterial cellulose and butanone, introduce nitrogen, add tetrafluorophthalic anhydride, raise the temperature to 65-70°C and react for 5-8h. After the reaction is completed, remove the solvent by distillation under reduced pressure, and collect the product to obtain organic fluorine-modified bacterial cellulose; S2: placing the organic fluorine-modified bacterial cellulose in N-methylpyrrolidone, fully mixing and stirring, adding pentaerythritol triacrylate and a catalyst, raising the temperature to 90-100°C to react for 6-8h, and after the reaction is completed, removing the solvent by vacuum distillation, and collecting the product to obtain anti-fouling and anti-corrosion cellulose.

4. The environmentally friendly paint according to claim 3, characterized in that: In step S2, the catalyst is any one of p-toluenesulfonic acid and aminobenzenesulfonic acid.

5. The environmentally friendly paint according to claim 1, characterized in that: The preparation method of the coumaric acid modified polyether comprises the following steps: Allyl alcohol polyether and coumaric acid are placed in N,N-dimethylformamide, fully mixed and stirred, and then p-toluenesulfonic acid is added. The temperature is raised to react, and the solvent is removed by distillation under reduced pressure. The product is collected to obtain coumaric acid modified polyether.

6. The environmentally friendly paint according to claim 5, characterized in that: The temperature of the temperature-raising reaction is 95-105° C. and the time is 5-6 hours.

7. A method for preparing an environmentally friendly paint as claimed in claim 1, characterized in that: The following steps are involved: Step 1: placing phenyl acrylate, styrene, lauryl methacrylate, tert-butyl acrylate, antifouling and anticorrosion cellulose, and coumaric acid-modified polyether in anhydrous ethanol, adding an initiator, heating to 50-55° C., and fully stirring to obtain an environmentally friendly paint base material; Step 2: Add dimethyl silicone oil defoamer and polyurethane leveling agent to the environmentally friendly paint base material and mix evenly to obtain environmentally friendly paint.

8. The method for preparing an environmentally friendly paint according to claim 7, characterized in that: In step 1, the rotation speed of the sufficient stirring is 200-300 r / min, and the time is 6-8 h.

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