Quick-drying alkyd resin and preparation method thereof

Abstract

The invention discloses quick-drying alkyd resin and a preparation method thereof, and belongs to the technical field of resin.The quick-drying alkyd resin is prepared from, by weight, 10-12 parts of trimethylolpropane, 8-15 parts of phthalic anhydride, 15-18 parts of linoleic acid, 5-8 parts of four-terminal alkenyl terephthalic acid derivatives, 15-20 parts of xylene, 2-3 parts of styrene and 0.02-0.03 part of initiator. The four-terminal alkenyl terephthalic acid derivative and styrene are used for synergistic modification, the prepared quick-drying alkyd resin has excellent mechanical properties, meanwhile, the drying time is shortened, and the requirement of the market for quick-drying materials is sufficiently met.

Description

Technical Field

[0001] The invention belongs to the technical field of resins, and in particular relates to a quick-drying alkyd resin and a preparation method thereof. Background Art

[0002] Alkyd resin is prepared by condensation of multifunctional alcohols, polyacids and vegetable oils or vegetable oil acids. Different types of vegetable oils or fatty acid molecules have different numbers of double bonds, so they can be divided into drying, non-drying and semi-drying alkyd resins. They have good gloss, flexibility and durability, and are therefore widely used in coatings, inks, plastics and other fields.

[0003] The drying speed of alkyd resin is affected by solvent volatilization, oxidative polymerization, temperature, humidity and coating thickness. Oxidative polymerization requires the absorption of oxygen from the air and gradual chemical reaction. The entire curing process usually takes weeks or even months, which leads to a longer construction period and affects work efficiency. Slow drying speed may also lead to insufficient hardness of the paint film, thus affecting its wear resistance and durability. Therefore, how to effectively increase the drying speed of alkyd resin by modifying it is of great significance to improve the performance of alkyd resin paint film. Summary of the invention

[0004] To solve the above problems, the present invention aims to provide a quick-drying alkyd resin and a preparation method thereof.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: A quick-drying alkyd resin is composed of the following raw materials, measured in parts by weight: 10-12 parts of trimethylolpropane, 8-15 parts of phthalic anhydride, 15-18 parts of linoleic acid, 5-8 parts of tetra-terminal terephthalic acid derivatives, 15-20 parts of xylene, 2-3 parts of styrene and 0.02-0.03 parts of initiator; The tetra-terminal olefin terephthalic acid derivative is prepared by modifying 2,3,5,6-tetrahydroxy terephthalic acid with 5-hydroxypentyl 4-methylbenzenesulfonate and allyl bromide.

[0006] The tetra-terminal terephthalic acid derivative is prepared according to the following method: 1) Add 2,3,5,6-tetrahydroxyterephthalic acid, 5-hydroxypentyl 4-methylbenzenesulfonate and potassium carbonate into acetonitrile, stir to dissolve, heat under reflux to react for 10-20 hours, filter after the reaction is completed, and distill the obtained filtrate under reduced pressure to remove the solvent to obtain a 5-hydroxypentyl terephthalic acid derivative; 2) Add the 5-hydroxypentyl terephthalic acid derivative obtained in step 1) into methanol, then add trimethylchlorosilane, stir and mix evenly, react at 25 - 30 °C for 12 - 24 h. After the reaction is completed, add saturated sodium bicarbonate aqueous solution, stir until there are no bubbles, then add dichloromethane, separate the organic layer, and distill off the solvent under reduced pressure for the obtained organic layer to obtain the carboxyl-protected 5-hydroxypentyl terephthalic acid derivative; 3) Add the carboxyl-protected 5-hydroxypentyl terephthalic acid derivative, allyl bromide and sodium hydride obtained in step 2) into tetrahydrofuran, stir to dissolve, then heat to 40 - 50 °C and react for 5 - 10 h. After the reaction is completed, add methanol to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, add dichloromethane to dissolve, filter, and distill off dichloromethane from the obtained filtrate under reduced pressure to obtain the carboxyl-protected tetra-allyl terephthalic acid derivative; 4) Add the carboxyl-protected tetra-allyl terephthalic acid derivative prepared in step 3) into methanol, stir to dissolve and then add sodium hydroxide, react at 25 - 35 °C for 10 - 20 h. After the reaction is completed, add water, then extract with dichloromethane, and spin-dry the obtained organic layer to obtain the tetra-allyl terephthalic acid derivative.

[0007] In step 1), the mass ratio of 2,3,5,6-tetrahydroxyterephthalic acid, 5-hydroxypentyl 4-methylbenzenesulfonate, potassium carbonate and acetonitrile is 1:4.5 - 6:2.5 - 3.5:15 - 20.

[0008] In step 2), the mass ratio of the 5-hydroxypentyl terephthalic acid derivative, methanol, trimethylchlorosilane, saturated sodium bicarbonate aqueous solution and dichloromethane is 1:5 - 10:0.55 - 0.6:5 - 8:5 - 8.

[0009] In step 3), the mass ratio of the carboxyl-protected 5-hydroxypentyl terephthalic acid derivative, allyl bromide, sodium hydride, tetrahydrofuran, methanol and dichloromethane is 1:1 - 1.5:0.2 - 0.25:5 - 10:5 - 8:5 - 10.

[0010] In step 4), the mass ratio of the carboxyl-protected tetra-allyl terephthalic acid derivative, methanol, sodium hydroxide, water and dichloromethane is 1:5 - 10:0.2 - 0.3:8 - 10:8 - 10.

[0011] The initiator is benzoyl peroxide or tert-butyl peroxybenzoate.

[0012] The preparation method of the quick-drying alkyd resin includes the following steps: Under nitrogen protection, 10-12 parts by weight of trimethylolpropane, 8-15 parts of phthalic anhydride, 15-18 parts of linolenic acid, 5-8 parts of tetra-end-alkenyl terephthalic acid derivative and 5 parts of xylene are added to a reaction kettle, heated to 180-220 °C for condensation reaction. When the acid value reaches 10-15 mgKOH / g, it is cooled to below 100 °C, diluted with 10-15 parts of xylene, then 2-3 parts of styrene and 0.02-0.03 parts of initiator are added thereto, heated to 100-120 °C, and reacted for 2-3 h. After the reaction is completed, it is cooled to obtain a quick-drying alkyd resin.

[0013] The present invention has the following advantages compared with the prior art: For the quick-drying alkyd resin of the present invention, the tetra-end-alkenyl terephthalic acid derivative is used to modify the alkyd resin. On the one hand, the pentyl chain contained in the tetra-end-alkenyl terephthalic acid derivative can form branches during the preparation of the alkyd resin, increasing the degree of branching, reducing the intermolecular force, and reducing the viscosity; at the same time, the branched structure increases the porous network structure of the resin, improves the diffusion rate of oxygen, and speeds up the drying rate of the alkyd resin; on the other hand, multiple functional groups (double bonds) are introduced, which can form more cross-linking points in the alkyd resin, copolymerize with styrene to form a three-dimensional network structure, and further improve the drying rate.

[0014] For the quick-drying alkyd resin of the present invention, the tetra-end-alkenyl terephthalic acid derivative and styrene are used for synergistic modification. The prepared quick-drying alkyd resin has excellent mechanical properties and shortens the drying time, which is sufficient to meet the market demand for quick-drying materials. Specific embodiments

[0015] In order to better understand the technical solution of the present invention, the following is a further detailed description of the above content of the present invention in the form of specific embodiments by examples, but this should not be construed as limiting the scope of the above subject matter of the present invention to the following examples. All technologies implemented based on the above content of the present invention belong to the scope of the present invention.

[0016] Example 1 Preparation of tetra-end-alkenyl terephthalic acid derivative 1) 0.1 kg of 2,3,5,6-tetrahydroxyterephthalic acid, 0.45 kg of 5-hydroxypentyl 4-methylbenzenesulfonate and 0.25 kg of potassium carbonate are added to 1.5 kg of acetonitrile. After stirring and dissolving, it is heated to reflux for 10 h. After the reaction is completed, it is filtered, and the obtained filtrate is distilled under reduced pressure to remove the solvent to obtain 5-hydroxypentyl terephthalic acid derivative; 2) Add 0.1 kg of 5 - hydroxyamyl terephthalic acid derivative to 0.5 kg of methanol, then add 0.055 kg of trimethylchlorosilane, stir and mix evenly, react at 25 °C for 12 h. After the reaction is completed, add 0.5 kg of saturated sodium bicarbonate aqueous solution, stir until there are no bubbles, then add 0.5 kg of dichloromethane, separate the organic layer, and distill the obtained organic layer under reduced pressure to remove the solvent to obtain a carboxyl - protected 5 - hydroxyamyl terephthalic acid derivative; 3) Add 0.1 kg of carboxyl - protected 5 - hydroxyamyl terephthalic acid derivative, 0.1 kg of allyl bromide and 0.02 kg of sodium hydride to 0.5 kg of tetrahydrofuran. After stirring and dissolving, heat to 40 °C and react for 5 h. After the reaction is completed, add 0.5 kg of methanol to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, add 0.5 kg of dichloromethane to dissolve, filter, and distill off dichloromethane from the obtained filtrate under reduced pressure to obtain a carboxyl - protected tetra - terminal - alkenyl terephthalic acid derivative; 4) Add 0.1 kg of carboxyl - protected tetra - terminal - alkenyl terephthalic acid derivative to 0.5 kg of methanol. After stirring and dissolving, add 0.02 kg of sodium hydroxide, react at 25 °C for 10 h. After the reaction is completed, add 0.8 kg of water, then add 0.8 kg of dichloromethane for extraction, and spin - dry the obtained organic layer to obtain a tetra - terminal - alkenyl terephthalic acid derivative.

[0017] Preparation of fast - drying alkyd resin Under nitrogen protection, add 1 kg of trimethylolpropane, 0.8 kg of phthalic anhydride, 1.5 kg of linolenic acid, 0.5 kg of tetra - terminal - alkenyl terephthalic acid derivative and 0.5 kg of xylene to the reaction kettle, heat to 180 °C for condensation reaction until the acid value reaches 10 mgKOH / g, cool to below 100 °C, add 1 kg of xylene for dilution, then add 0.2 kg of styrene and 0.002 kg of initiator benzoyl peroxide, heat to 100 °C, react for 2 h. After the reaction is completed, cool to obtain a fast - drying alkyd resin.

[0018] Example 2 Preparation of tetra - terminal - alkenyl terephthalic acid derivative 1) Add 0.1 kg of 2,3,5,6 - tetrahydroxyterephthalic acid, 0.5 kg of 5 - hydroxyamyl 4 - methylbenzenesulfonate and 0.28 kg of potassium carbonate to 1.6 kg of acetonitrile. After stirring and dissolving, heat to reflux for 12 h. After the reaction is completed, filter, and distill the obtained filtrate under reduced pressure to remove the solvent to obtain a 5 - hydroxyamyl terephthalic acid derivative; 2) Add 0.1 kg of 5 - hydroxypentyl terephthalic acid derivative into 0.6 kg of methanol, then add 0.056 kg of trimethylchlorosilane, stir and mix evenly, react at 26 °C for 14 h. After the reaction is completed, add 0.55 kg of saturated sodium bicarbonate aqueous solution, stir until there are no bubbles, then add 0.6 kg of dichloromethane, separate the organic layer, and distill the obtained organic layer under reduced pressure to remove the solvent, obtaining the carboxyl - protected 5 - hydroxypentyl terephthalic acid derivative; 3) Add 0.1 kg of carboxyl - protected 5 - hydroxypentyl terephthalic acid derivative, 0.11 kg of allyl bromide and 0.021 kg of sodium hydride into 0.6 kg of tetrahydrofuran, stir to dissolve, then heat to 42 °C and react for 9 h. After the reaction is completed, add 0.6 kg of methanol to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, add 0.6 kg of dichloromethane to dissolve, filter, and distill the obtained filtrate under reduced pressure to remove dichloromethane, obtaining the carboxyl - protected tetra - terminal - alkenyl terephthalic acid derivative; 4) Add 0.1 kg of carboxyl - protected tetra - terminal - alkenyl terephthalic acid derivative into 0.6 kg of methanol, stir to dissolve and then add 0.022 kg of sodium hydroxide, react at 28 °C for 19 h. After the reaction is completed, add 0.85 kg of water, then add 0.9 kg of dichloromethane for extraction, and spin - dry the obtained organic layer to obtain the tetra - terminal - alkenyl terephthalic acid derivative.

[0019] Preparation of fast - drying alkyd resin Under nitrogen protection, add 1.1 kg of trimethylolpropane, 1 kg of phthalic anhydride, 1.6 kg of linolenic acid, 0.6 kg of tetra - terminal - alkenyl terephthalic acid derivative and 0.5 kg of xylene into the reaction kettle, heat to 190 °C for condensation reaction. React until the acid value reaches 12 mgKOH / g, cool to below 100 °C, add 1.1 kg of xylene for dilution, then add 0.22 kg of styrene and 0.0021 kg of initiator tert - butyl peroxybenzoate, heat to 105 °C, react for 2.2 h. After the reaction is completed, cool to obtain the fast - drying alkyd resin.

[0020] Example 3 Preparation of tetra - terminal - alkenyl terephthalic acid derivative 1) Add 0.1 kg of 2,3,5,6 - tetrahydroxyterephthalic acid, 0.52 kg of 5 - hydroxypentyl 4 - methylbenzenesulfonate and 0.3 kg of potassium carbonate into 1.7 kg of acetonitrile, stir to dissolve, then heat to reflux and react for 15 h. After the reaction is completed, filter, and distill the obtained filtrate under reduced pressure to remove the solvent, obtaining the 5 - hydroxypentyl terephthalic acid derivative; 1 H NMR(300 MHz, DMSO - d 6, 298K) δ 12.73(s, 2H), 4.67(s, 4H), 4.05(t, 8H), 3.65(s, 8H), 1.78 - 1.89(m, 8H), 1.51 - 1.69 (m, 16H).

[0021] 2) Add 0.1 kg of 5 - hydroxypentyl terephthalic acid derivative to 0.7 kg of methanol, then add 0.058 kg of trimethylchlorosilane, stir and mix evenly, react at 28 °C for 16 h. After the reaction is completed, add 0.6 kg of saturated sodium bicarbonate aqueous solution, stir until there are no bubbles, then add 0.65 kg of dichloromethane, separate the organic layer, and distill off the solvent under reduced pressure from the obtained organic layer to obtain the carboxyl - protected 5 - hydroxypentyl terephthalic acid derivative; 1 H NMR(300 MHz, DMSO - d 6 , 298 K) δ 4.70(s, 4H), 4.07(t, 8H), 3.95(s, 6H), 3.67(s, 8H), 1.79 - 1.85(m, 8H), 1.50 - 1.67(m, 16H).

[0022] 3) Add 0.1 kg of carboxyl - protected 5 - hydroxypentyl terephthalic acid derivative, 0.13 kg of allyl bromide and 0.022 kg of sodium hydride to 0.7 kg of tetrahydrofuran, stir to dissolve, then heat to 45 °C and react for 8 h. After the reaction is completed, add 0.7 kg of methanol to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, add 0.8 kg of dichloromethane to dissolve, filter, and distill off dichloromethane from the obtained filtrate under reduced pressure to obtain the carboxyl - protected tetra - terminal - alkenyl terephthalic acid derivative; 1 H NMR(300 MHz,DMSO - d 6 , 298 K) δ 6.05 - 6.14(m, 4H), 5.47(d, 4H), 5.35(d, 4H), 4.02 - 4.10(m,16H), 3.95(s, 6H), 3.37 (t, 8H), 1.80 - 1.86(m, 8H), 1.48 - 1.65 (m, 16H).

[0023] 4) Add 0.1 kg of carboxyl - protected tetra - terminal - alkenyl terephthalic acid derivative to 0.8 kg of methanol, stir to dissolve and then add 0.025 kg of sodium hydroxide, react at 30 °C for 15 h. After the reaction is completed, add 0.8 kg of water, then add 0.9 kg of dichloromethane for extraction, and spin - dry the obtained organic layer to obtain the tetra - terminal - alkenyl terephthalic acid derivative. 11H NMR (300 MHz, DMSO- d 6 , 298 K) δ 12.75 (s, 2H), 6.05 - 6.12 (m, 4H), 5.45 (d, 4H), 5.33 (d, 4H), 4.03 - 4.11 (m, 16H), 3.35 (t, 8H), 1.79 - 1.87 (m, 8H), 1.50 - 1.67 (m, 16H).

[0024] Preparation of Fast-drying Alkyd Resin Under nitrogen protection, 1.1 kg of trimethylolpropane, 1.2 kg of phthalic anhydride, 1.7 kg of linolenic acid, 0.7 kg of tetra-allyl terephthalic acid derivative and 0.5 kg of xylene were added to the reaction kettle, heated to 210 °C for condensation reaction. When the acid value reached 13 mg KOH / g, the temperature was lowered to below 100 °C, and 1.2 kg of xylene was added for dilution. Then, 0.25 kg of styrene and 0.0025 kg of initiator benzoyl peroxide were added, heated to 110 °C, and reacted for 2.5 h. After the reaction was completed, the temperature was lowered to obtain the fast-drying alkyd resin.

[0025] Example 4 Preparation of Tetra-allyl Terephthalic Acid Derivative 1) 0.1 kg of 2,3,5,6-tetrahydroxyterephthalic acid, 0.55 kg of 5-hydroxypentyl 4-methylbenzenesulfonate and 0.32 kg of potassium carbonate were added to 1.8 kg of acetonitrile. After stirring and dissolving, the mixture was heated under reflux for 18 h. After the reaction was completed, it was filtered, and the obtained filtrate was distilled under reduced pressure to remove the solvent to obtain 5-hydroxypentyl terephthalic acid derivative; 2) 0.1 kg of 5-hydroxypentyl terephthalic acid derivative was added to 0.8 kg of methanol, and then 0.058 kg of trimethylchlorosilane was added. After stirring and mixing evenly, the reaction was carried out at 29 °C for 20 h. After the reaction was completed, 0.7 kg of saturated sodium bicarbonate aqueous solution was added, stirred until there were no bubbles, and then 0.75 kg of dichloromethane was added. The organic layer was separated, and the obtained organic layer was distilled under reduced pressure to remove the solvent to obtain carboxyl-protected 5-hydroxypentyl terephthalic acid derivative; 3) 0.1 kg of carboxyl-protected 5-hydroxypentyl terephthalic acid derivative, 0.14 kg of allyl bromide and 0.024 kg of sodium hydride were added to 0.8 kg of tetrahydrofuran. After stirring and dissolving, the mixture was heated to 48 °C and reacted for 6 h. After the reaction was completed, 0.7 kg of methanol was added to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, 0.9 kg of dichloromethane was added for dissolution, and then filtered. The obtained filtrate was distilled under reduced pressure to remove dichloromethane to obtain carboxyl-protected tetra-allyl terephthalic acid derivative; 4) Add 0.1 kg of carboxyl-protected tetra-alkenyl terephthalic acid derivative to 0.9 kg of methanol. After stirring and dissolving, add 0.028 kg of sodium hydroxide, and react at 33 °C for 18 h. After the reaction is completed, add 0.9 kg of water, then add 0.9 kg of dichloromethane for extraction. Spin-dry the obtained organic layer to obtain the tetra-alkenyl terephthalic acid derivative.

[0026] Preparation of Fast-drying Alkyd Resin Under nitrogen protection, add 1.1 kg of trimethylolpropane, 1.4 kg of phthalic anhydride, 1.6 kg of linolenic acid, 0.75 kg of tetra-alkenyl terephthalic acid derivative and 0.5 kg of xylene to the reaction kettle, heat to 200 °C for condensation reaction. React until the acid value reaches 14 mg KOH / g, cool down to below 100 °C, add 1.4 kg of xylene for dilution, then add 0.28 kg of styrene and 0.0026 kg of initiator tert-butyl peroxybenzoate, heat to 115 °C, and react for 2.8 h. After the reaction is completed, cool down to obtain the fast-drying alkyd resin.

[0027] Example 5 Preparation of Tetra-alkenyl Terephthalic Acid Derivative 1) Add 0.1 kg of 2,3,5,6-tetrahydroxyterephthalic acid, 0.6 kg of 5-hydroxypentyl 4-methylbenzenesulfonate and 0.35 kg of potassium carbonate to 2 kg of acetonitrile. After stirring and dissolving, heat under reflux for 20 h. After the reaction is completed, filter, and distill the obtained filtrate under reduced pressure to remove the solvent to obtain the 5-hydroxypentyl terephthalic acid derivative. 2) Add 0.1 kg of 5-hydroxypentyl terephthalic acid derivative to 1 kg of methanol, then add 0.06 kg of trimethylchlorosilane, stir and mix evenly, and react at 30 °C for 24 h. After the reaction is completed, add 0.8 kg of saturated sodium bicarbonate aqueous solution, stir until there are no bubbles, then add 0.8 kg of dichloromethane, separate the organic layer, and distill the obtained organic layer under reduced pressure to remove the solvent to obtain the carboxyl-protected 5-hydroxypentyl terephthalic acid derivative. 3) Add 0.1 kg of carboxyl-protected 5-hydroxypentyl terephthalic acid derivative, 0.15 kg of allyl bromide and 0.025 kg of sodium hydride to 1 kg of tetrahydrofuran. After stirring and dissolving, heat to 50 °C and react for 5 h. After the reaction is completed, add 0.8 kg of methanol to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, add 1 kg of dichloromethane to dissolve, filter, and distill the obtained filtrate under reduced pressure to remove dichloromethane to obtain the carboxyl-protected tetra-alkenyl terephthalic acid derivative. 4) Add 0.1 kg of carboxyl-protected tetra-alkenyl terephthalic acid derivative into 1 kg of methanol. After stirring and dissolving, add 0.03 kg of sodium hydroxide, and react at 35 °C for 20 h. After the reaction is completed, add 1 kg of water, then add 1 kg of dichloromethane for extraction. Spin-dry the obtained organic layer to obtain the tetra-alkenyl terephthalic acid derivative.

[0028] Preparation of fast-drying alkyd resin Under nitrogen protection, add 1.2 kg of trimethylolpropane, 1.5 kg of phthalic anhydride, 1.8 kg of linolenic acid, 0.8 kg of tetra-alkenyl terephthalic acid derivative and 0.5 kg of xylene into the reaction kettle, heat to 220 °C for condensation reaction. React until the acid value reaches 15 mg KOH / g, cool down to below 100 °C, add 1.5 kg of xylene for dilution, then add 0.3 kg of styrene and 0.003 kg of initiator tert-butyl peroxybenzoate, heat to 120 °C, and react for 3 h. After the reaction is completed, cool down to obtain the fast-drying alkyd resin.

[0029] Example 6 Preparation of tetra-alkenyl terephthalic acid derivative 1) Add 0.1 kg of 2,3,5,6-tetrahydroxyterephthalic acid, 0.5 kg of 5-hydroxypentyl 4-methylbenzenesulfonate and 0.3 kg of potassium carbonate into 2 kg of acetonitrile. After stirring and dissolving, heat under reflux for 15 h. After the reaction is completed, filter, and distill the obtained filtrate under reduced pressure to remove the solvent to obtain 5-hydroxypentyl terephthalic acid derivative. 2) Add 0.1 kg of 5-hydroxypentyl terephthalic acid derivative into 0.8 kg of methanol, then add 0.055 kg of trimethylchlorosilane, stir and mix evenly, and react at 30 °C for 12 h. After the reaction is completed, add 0.5 kg of saturated sodium bicarbonate aqueous solution, stir until there are no bubbles, then add 0.8 kg of dichloromethane, separate the organic layer, and distill the obtained organic layer under reduced pressure to remove the solvent to obtain carboxyl-protected 5-hydroxypentyl terephthalic acid derivative. 3) Add 0.1 kg of carboxyl-protected 5-hydroxypentyl terephthalic acid derivative, 0.15 kg of allyl bromide and 0.02 kg of sodium hydride into 1 kg of tetrahydrofuran. After stirring and dissolving, heat to 50 °C and react for 10 h. After the reaction is completed, add 0.5 kg of methanol to the obtained reaction solution to quench the reaction. After distilling off the solvent under reduced pressure, add 1 kg of dichloromethane to dissolve, filter, and distill off dichloromethane from the obtained filtrate under reduced pressure to obtain carboxyl-protected tetra-alkenyl terephthalic acid derivative. 4) Add 0.1 kg of carboxyl-protected tetra-alkenyl terephthalic acid derivative to 1 kg of methanol. After stirring and dissolving, add 0.02 kg of sodium hydroxide, and react at 25 °C for 20 h. After the reaction is completed, add 1 kg of water, then add 0.8 kg of dichloromethane for extraction. Spin-dry the obtained organic layer to obtain the tetra-alkenyl terephthalic acid derivative.

[0030] Preparation of Fast-Drying Alkyd Resin Under nitrogen protection, add 1 kg of trimethylolpropane, 1.5 kg of phthalic anhydride, 1.5 kg of linolenic acid, 0.8 kg of tetra-alkenyl terephthalic acid derivative, and 0.5 kg of xylene to the reaction kettle. Heat to 200 °C for condensation reaction until the acid value reaches 14 mg KOH / g. Cool to below 100 °C, add 1.5 kg of xylene for dilution, then add 0.3 kg of styrene and 0.002 kg of initiator benzoyl peroxide. Heat to 120 °C and react for 2 h. After the reaction is completed, cool down to obtain the fast-drying alkyd resin.

[0031] Prepare the fast-drying alkyd resins prepared in Examples 1 to 6 according to GB / T 1727-2021 "General Method for Preparation of Paint Films". The drying time is tested according to the method in GB / T 1728-2020, the hardness is tested according to the method in GB / T 6739-2006, the adhesion is tested according to the method in GB / T 9286-1998, the water resistance is tested according to the method in GB / T 1733-1993, the salt water resistance is tested according to the method in GB / T 9274-88, and the impact resistance is tested according to the method in GB / T 1732-93. The test results are shown in Table 1.

[0032] Table 1 Performance Test Results of the Materials Prepared in Examples 1 to 6

[0033] As can be seen from the results in Table 1, all the indicators of the fast-drying alkyd resin prepared by the present invention can meet the national standards, and it has excellent mechanical properties. Compared with ordinary alkyd resins, it has a faster drying speed, which is sufficient to meet the market demand for fast-drying materials.

[0034] Although the specific implementation manners of the present invention are described above, it is not a limitation to the protection scope of the present invention. Based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A quick-drying alkyd resin, characterized in that: The composition is composed of the following raw materials in parts by weight: 10-12 parts of trimethylolpropane, 8-15 parts of phthalic anhydride, 15-18 parts of linoleic acid, 5-8 parts of tetra-terminal terephthalic acid derivatives, 15-20 parts of xylene, 2-3 parts of styrene and 0.02-0.03 parts of initiator; The tetra-terminal olefin terephthalic acid derivative is prepared by modifying 2,3,5,6-tetrahydroxy terephthalic acid with 5-hydroxypentyl 4-methylbenzenesulfonate and allyl bromide.

2. The quick-drying alkyd resin according to claim 1, characterized in that: The tetra-terminal terephthalic acid derivative is prepared according to the following method: 1) Add 2,3,5,6-tetrahydroxyterephthalic acid, 5-hydroxypentyl 4-methylbenzenesulfonate and potassium carbonate into acetonitrile, stir to dissolve, heat under reflux to react for 10-20 hours, filter after the reaction is completed, and distill the obtained filtrate under reduced pressure to remove the solvent to obtain a 5-hydroxypentyl terephthalic acid derivative; 2) adding the 5-hydroxypentyl terephthalic acid derivative obtained in step 1) to methanol, then adding trimethylsilyl chloride, stirring and mixing evenly, reacting at 25-30° C. for 12-24 hours, and after the reaction is completed, adding saturated sodium bicarbonate aqueous solution, stirring until there are no bubbles, then adding dichloromethane, separating the organic layer, and removing the solvent from the obtained organic layer under reduced pressure to obtain a carboxyl-protected 5-hydroxypentyl terephthalic acid derivative; 3) adding the carboxyl protected 5-hydroxypentyl terephthalic acid derivative obtained in step 2), propylene bromide and sodium hydride to tetrahydrofuran, stirring to dissolve, heating to 40-50° C. to react for 5-10 hours, and after the reaction is completed, adding methanol to the obtained reaction solution to quench the reaction, distilling under reduced pressure to remove the solvent, and then adding dichloromethane to dissolve, filtering, and distilling the obtained filtrate under reduced pressure to remove dichloromethane to obtain a carboxyl protected tetra-terminal olefin terephthalic acid derivative; 4) Add the carboxyl protected tetraolefin terephthalic acid derivative prepared in step 3) into methanol, stir to dissolve, then add sodium hydroxide, react at 25-35°C for 10-20h, add water after the reaction is completed, then add dichloromethane for extraction, spin dry the obtained organic layer to obtain the tetraolefin terephthalic acid derivative.

3. The quick-drying alkyd resin according to claim 2, characterized in that: The mass ratio of 2,3,5,6-tetrahydroxyterephthalic acid, 5-hydroxypentyl 4-methylbenzenesulfonate, potassium carbonate and acetonitrile in step 1) is 1:4.5-6:2.5-3.5:15-20.

4. The quick-drying alkyd resin according to claim 2, characterized in that: The mass ratio of the 5-hydroxypentyl terephthalic acid derivative, methanol, trimethylsilyl chloride, saturated sodium bicarbonate aqueous solution and dichloromethane in step 2) is 1:5-10:0.55-0.6:5-8:5-8.

5. The quick-drying alkyd resin according to claim 2, characterized in that: In step 3), the mass ratio of the carboxyl-protected 5-hydroxypentyl terephthalic acid derivative, allyl bromide, sodium hydride, tetrahydrofuran, methanol and dichloromethane is 1:1-1.5:0.2-0.25:5-10:5-8:5-10.

6. The quick-drying alkyd resin according to claim 2, characterized in that: In step 4), the mass ratio of the carboxyl protected tetraolefin terephthalic acid derivative, methanol, sodium hydroxide, water and dichloromethane is 1:5-10:0.2-0.3:8-10:8-10.

7. The quick-drying alkyd resin according to claim 1, characterized in that: The initiator is benzoyl peroxide or tert-butyl benzoyl peroxide.

8. The method for preparing the quick-drying alkyd resin according to claim 1, characterized in that: The following steps are involved: In parts by weight, under nitrogen protection, 10-12 parts of trimethylolpropane, 8-15 parts of phthalic anhydride, 15-18 parts of linoleic acid, 5-8 parts of tetra-terminal terephthalic acid derivatives and 5 parts of xylene are added to a reaction kettle, heated to 180-220°C for condensation reaction, react until the acid value reaches 10-15 mgKOH / g, cool to below 100°C, add 10-15 parts of xylene for dilution, then add 2-3 parts of styrene and 0.02-0.03 parts of initiator, heat to 100-120°C, react for 2-3 hours, and after the reaction is completed, cool to obtain a quick-drying alkyd resin.

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