A quick-drying road marking paint and preparation method thereof

Abstract

The invention discloses a quick-drying road marking paint and a preparation method thereof, and relates to the technical field of coatings; the quick-drying road marking paint consists of a cashew nut shell oil-modified rosin resin, a silane coupling agent-modified alkyd resin, titanium dioxide, talcum powder, calcium carbonate powder, glass microbeads and dioctyl phthalate; the cashew nut shell oil-modified rosin resin consists of rosin, fumaric acid, glycerol and cashew nut shell oil; the silane coupling agent-modified alkyd resin consists of alkyd resin and silane coupling agent KH570; a film-forming composite resin synthesized from cashew nut shell oil-modified rosin resin-silane coupling agent-modified alkyd resin has the properties of short drying time, light color, high softening point, good toughness, heat resistance, water resistance and the like, reduces the adverse effects of driving, temperature and rain, effectively improves durability and prolongs service life.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a quick-drying road marking coating and a preparation method thereof. Background Art

[0002] Road markings are the core part of traffic safety facilities and play an irreplaceable role in traffic control. With the rapid development of my country's road transportation industry and the loss of existing road marking paints, existing and newly built roads need to re-plan a large number of markings. Therefore, the research on road marking paints not only has scientific significance and economic value, but also has broad application prospects. At present, there are four main types of road marking paints commonly found on the market in my country, namely solvent-based, hot-melt, two-component and water-based paints. Among them, solvent-based paints cause serious pollution during construction and the operation of construction equipment is complicated. Although two-component and water-based paints are simple to construct and less polluting, they have poor wear resistance and durability and a short service life, making them difficult to be promoted and used on a large scale. Hot-melt road marking paints have long occupied the primary position of road marking paints due to their advantages such as strong adhesion, wear resistance, long service life and low engineering cost.

[0003] The existing technology currently has the following problems:

[0004] After hot-melt road marking paint is applied on the road surface, the drying time is not ideal. Construction on the road will inevitably temporarily close the road, affecting the time for vehicles to pass. Therefore, the drying time can be further shortened to relieve traffic pressure. In addition, hot-melt road marking paint has poor toughness and is prone to peeling and cracking. Its durability is insufficient, which limits its service life. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention proposes a quick-drying road marking paint, comprising the following components in parts by weight: 10-20 parts of cashew nut shell oil-modified rosin resin, 5-10 parts of silane coupling agent-modified alkyd resin, 5-8 parts of titanium dioxide, 15-20 parts of talc powder, 15-20 parts of calcium carbonate powder, 15-20 parts of glass microspheres, and 1-2 parts of dioctyl phthalate.

[0006] The cashew nut shell oil-modified rosin resin comprises the following components in parts by weight: 20-40 parts of rosin, 2-6 parts of fumaric acid, 3-7 parts of glycerol, and 8-16 parts of cashew nut shell oil.

[0007] The silane coupling agent modified alkyd resin comprises the following components in parts by weight: 40-50 parts of alkyd resin and 1-3 parts of silane coupling agent KH570.

[0008] The preparation method of the cashew nut shell oil modified rosin resin specifically comprises the following steps:

[0009] (1) Add 60g of rosin into a four-necked flask equipped with a condenser, a thermometer and a stirrer, introduce nitrogen, heat to 150-200°C, start stirring to melt the floating rosin, add the remaining 40g of rosin after melting. Rosin is relatively cheap and easy to source, and can be used in various fields where odor requirements are not high. Add fumaric acid while stirring, then heat to control the temperature at 200°C, react for 1-2h, then add glycerol, heat to 260-270°C, react for 6-7h, discharge small molecules and water generated by esterification while reacting, evacuate, collect the remaining small molecule compounds, use fumaric acid and glycerol to undergo diene synthesis reaction and polyesterification reaction, reduce the acid value of the modified rosin, and increase its softening point to obtain rosin resin;

[0010] (2) Add the rosin resin, cashew nut shell oil and catalyst described in step (1) into a reaction kettle and stir and mix, wherein the amount of cashew nut shell oil is 6-8% of the total amount of reactants, and control the system temperature to 60-80°C. After dissolving into a solution, the temperature is raised to 80-100°C for reaction for 2-6h, and vacuum dehydration is performed at 70-90°C for 1-3h. The addition of cashew nut shell oil improves the crosslinking density and stability, which is beneficial to shortening the drying time, and improving the toughness and heat resistance of the rosin resin, thereby obtaining a cashew nut shell oil-modified rosin resin;

[0011] Preferably, in step (2), the catalyst is dibutyltin dilaurate, and the amount used is 0.1-0.5% of the total amount of the reactants, which can achieve a high-efficiency, low-toxicity organic reaction result and improve the reaction efficiency.

[0012] The preparation method of the silane coupling agent modified alkyd resin specifically comprises the following steps:

[0013] a. Add 15-18g phthalic anhydride, 4-6g isophthalic acid, 20-30g soybean oil acid, 15-20g linoleic acid, 3-8g diethylene glycol and 10-20g pentaerythritol into a flask and stir at a stirring speed of 200-300rpm. Soybean oil acid and linoleic acid can improve the dryness and water resistance of the resin, and the end point is easy to control. Use water and xylene as reflux solvents, heat to 160-180°C, and after the temperature stabilizes, heat to 190-200°C for esterification reflux reaction. The reaction time is 3-4h. During this period, samples are taken every 1h to determine the acid value and water is appropriately discharged or xylene is added. When the acid value drops below 70mgKOH / g, controlling the acid value is beneficial to improving the durability of the resin product, and the adsorption capacity for other additives is stronger, which is beneficial to improving the comprehensive performance of the resin. Stop heating and reduce the stirring speed to 30-50rpm to obtain an alkyd resin;

[0014] b. Place the alkyd resin in step a at room temperature below 80°C, maintain a stirring speed of 30-50rpm, and drop silane coupling agent KH570 within 20-30min, the addition amount of silane coupling agent KH570 is 4-6%, and maintain for 20-30min. The addition of silane coupling agent KH570 not only retains the room temperature curing of alkyd resin and the excellent physical and mechanical properties of the coating, but also significantly accelerates the drying speed of the coating due to the presence of double bonds, improves quick-drying properties, and also has heat resistance, Durability, gloss and color retention are beneficial to the improvement of the comprehensive performance of alkyd resin materials. Then, the temperature is raised to 140-180°C, stirring is started, the stirring speed is 200-300rpm, and the stirring time is 2-3h. During this period, samples are taken every 30 minutes to determine the acid value and water is appropriately added or xylene is added. When the acid value drops below 40mgKOH / g, the heating is stopped and the stirring is turned off. 0.5-1 times the amount of deionized water is added, and a high-speed disperser is used for uniform dispersion. Filter, and obtain silane coupling agent modified alkyd resin;

[0015] Preferably, in step b, during the high-speed dispersion process, the rotation speed is 500-600 rpm and the time is 0.5-1h. Uniform dispersion is beneficial to improving the size and uniformity of the particle size. At the same fixed content, the smaller the particle size and the smaller the spacing between the particles, the faster the drying speed and the larger the specific surface area, which is beneficial to the mutual diffusion between the components during film formation, improving the crosslinking degree and shortening the drying time.

[0016] The present invention also provides a method for preparing a quick-drying road marking paint, which specifically comprises the following steps:

[0017] S1. Adding cashew nut shell oil-modified rosin resin and silane coupling agent-modified alkyd resin into a four-necked flask equipped with a thermometer and a condenser to melt them. The resin material synthesized by the two has the advantages of quick drying, light color, high softening point and low brittleness, and is suitable as a film-forming substance for road marking coatings to obtain a film-forming composite resin;

[0018] S2, the film-forming composite resin described in step S1 is mixed with titanium dioxide, talcum powder, and calcium carbonate powder, and the stirring is continued at 125-145° C. When all are melted, glass beads and dioctyl phthalate are added. Dioctyl phthalate is used as a plasticizer to improve the flexibility and fluidity of the coating, but excessive addition can reduce the softening point of the coating. The temperature is raised to 160-170° C. and stirring is continued for 5-10 minutes. After all components are melted, the temperature is raised to 200° C. and kept warm for 10-30 seconds, and the material is discharged to obtain a quick-drying road marking paint;

[0019] Preferably, in step S1, during the melting process, the temperature is controlled at 180-200°C and the reaction time is 1-2h, which meets the requirement that the raw materials of hot-melt road marking paint should be mixed at 200°C during construction;

[0020] Preferably, in step S2, talcum powder is processed through a 200-300 mesh screen, and calcium carbonate powder is processed through a 300-400 mesh screen. Controlling the particle size is beneficial to improving the fluidity and mechanical strength of the filler.

[0021] The beneficial effects achieved by the present invention are as follows:

[0022] The invention uses cashew nut shell oil modified rosin resin-silane coupling agent modified alkyd resin as film-forming composite resin and other auxiliary materials to synthesize road marking paint, thereby improving the drying speed of the paint, shortening the drying time, effectively improving the toughness, having water resistance and heat resistance, significantly enhancing the durability, and effectively extending the service life; in the cashew nut shell oil modified rosin resin, the phenolic compounds in the cashew nut shell oil allow the components to be combined more closely and more easily, forming more network structures, thereby improving the easy drying, wear resistance and heat resistance; the cashew nut shell oil contains cashew nut shell oil, which is more convenient to use. Fruit phenol, with its aromatic ring and long fatty chain structure, helps to improve the brittleness of rosin resin, achieves toughening effect, maintains a good balance between flexibility and hardness, and also has good water resistance; cashew nut shell oil can also be cross-linked with silane coupling agent modified alkyd resin, increasing the cross-linking density, helping to shorten the drying time and improve quick-drying properties. Its alcohol hydroxyl group serves as a chain termination structure to avoid gelation during synthesis, which is beneficial to maintaining fluidity and further helps to improve the drying rate; in the silane coupling agent modified alkyd resin, the silane coupling agent KH570 not only has silicon monomer The polycondensation reaction of the double bond makes the drying speed significantly faster. Due to the introduction of silicon element, the water resistance and heat resistance are also improved. It is not easy to be aged by light and heat, which improves the defect of poor heat resistance of alkyd resin and is beneficial to prolong the service life. Silane coupling agent KH570 can also improve the compatibility of cashew nut shell oil modified rosin resin and silane coupling agent modified alkyd resin, has a defoaming effect, and is beneficial to improve the comprehensive performance of film-forming composite resin. Therefore, the film-forming composite resin synthesized by cashew nut shell oil modified rosin resin-silane coupling agent modified alkyd resin The resin has the properties of short drying time, light color, high softening point, good toughness, heat resistance, water resistance, etc. The good gloss and light retention also make the road marking clearer, which is conducive to driving safety. The invention uses cashew nut shell oil modified rosin resin, silane coupling agent modified alkyd resin, titanium dioxide, talcum powder, calcium carbonate powder, glass microbeads and dioctyl phthalate to prepare a quick-drying road marking paint, which improves the drying rate, enhances the flexibility, heat resistance, water resistance, reduces the adverse effects of driving, temperature and rain, effectively improves the durability, and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a scanning electron microscope image of the cashew nut shell liquid modified rosin resin-silane coupling agent modified alkyd resin prepared in Example 1 of the present invention;

[0024] Figure 2 It is a graph showing the non-stick tire drying time results of Examples 1-4 of the present invention and Comparative Examples 1-3;

[0025] Figure 3 The flexibility results of Examples 1-4 and Comparative Examples 1-3 of the present invention are shown in FIG.

[0026] Figure 4 The water resistance comparison result diagram of Examples 1-4 of the present invention and Comparative Examples 1-3;

[0027] Figure 5 The yellowing index results of Examples 1-4 and Comparative Examples 1-3 of the present invention are shown in FIG. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0030] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified.

[0031] The sources of the reagents used in the examples are as follows:

[0032] Titanium dioxide CAS No: 13463-67-7, brand Innochem, product number A02033;

[0033] Talc CAS No: 14807-96-6, brand Innochem, product number A69285;

[0034] Calcium carbonate powder brand Acros, item number 124670010;

[0035] Glass beads brand Potters, item number 5000-CP03;

[0036] Dioctyl phthalate CAS No: 117-81-7, brand Innochem, product number A07348;

[0037] Rosin CAS No: 8050-09-7, brand Alfa, item number 036734;

[0038] Fumaric acid CAS No: 110-17-8, brand Innochem, product number A35349;

[0039] Glycerin CAS No: 26545-74-4, brand Yuanye, product number B74085-25mg;

[0040] Cashew nut shell liquid brand Hubei Chengfeng, specification 25kg;

[0041] Dibutyltin dilaurate CAS No: 77-58-7, brand Innochem, product number A77457;

[0042] Silane coupling agent KH570CASNo:2530-85-0, brand Innochem, product number T1601;

[0043] Phthalic anhydride CAS No: 85-44-9, brand Innochem, product number A68656;

[0044] Isophthalic acid CAS No: 121-91-5, brand Alfa, product number A14445;

[0045] Soybean oil acid CAS No: 68308-53-2, brand Chemegen, product number C110347;

[0046] Linoleic acid brand: Nanjing Dongde, item number: DD0001;

[0047] Diethylene glycol CAS No: 111-46-6, brand Innochem, product number A64322;

[0048] Pentaerythritol CAS No: 115-77-5, brand Acros, product number 129870010;

[0049] Xylene CAS No: 1330-20-7, brand Innochem, product number A62975.

[0050] Example 1

[0051] This embodiment provides a quick-drying road marking paint, comprising the following components in parts by weight: 20 parts of cashew nut shell oil-modified rosin resin, 10 parts of silane coupling agent-modified alkyd resin, 8 parts of titanium dioxide, 20 parts of talc powder, 20 parts of calcium carbonate powder, 20 parts of glass microspheres, and 2 parts of dioctyl phthalate.

[0052] The cashew nut shell oil-modified rosin resin comprises the following components in parts by weight: 40 parts of rosin, 6 parts of fumaric acid, 7 parts of glycerin and 16 parts of cashew nut shell oil.

[0053] The silane coupling agent modified alkyd resin comprises the following components in parts by weight: 50 parts of alkyd resin and 3 parts of silane coupling agent KH570.

[0054] The preparation method of cashew nut shell oil modified rosin resin specifically comprises the following steps:

[0055] (1) Add 60g of rosin into a four-necked flask equipped with a condenser, a thermometer and a stirrer, introduce nitrogen, heat to 200°C, start stirring to melt the floating rosin, add the remaining 40g of rosin after melting. Rosin is relatively cheap and easy to source, and can be used in various fields where odor requirements are not high. Add fumaric acid while stirring, then heat to control the temperature at 200°C, react for 2h, then add glycerol, heat to 270°C, react for 7h, discharge small molecules and water generated by esterification while reacting, evacuate, collect the remaining small molecule compounds, use fumaric acid and glycerol to undergo diene synthesis reaction and polyesterification reaction, reduce the acid value of the modified rosin, increase its softening point, and obtain rosin resin;

[0056] (2) The rosin resin, cashew nut shell oil and catalyst described in step (1) are added to a reaction kettle and stirred and mixed. The amount of cashew nut shell oil is 8% of the total amount of the reactants. The catalyst is dibutyltin dilaurate, and the amount is 0.5% of the total amount of the reactants. An efficient and low-toxic organic reaction result can be achieved, and the reaction efficiency is improved. The system temperature is controlled at 80°C. After dissolving into a solution, the temperature is raised to 100°C for reaction for 6 hours, and vacuum dehydration is performed at 90°C for 3 hours. The addition of cashew nut shell oil increases the crosslinking density and stability, which is beneficial to shortening the drying time, and improving the toughness and heat resistance of the rosin resin, thereby obtaining a cashew nut shell oil-modified rosin resin.

[0057] The preparation method of silane coupling agent modified alkyd resin specifically comprises the following steps:

[0058] a. Add 18g of phthalic anhydride, 6g of isophthalic acid, 30g of soybean oil acid, 20g of linoleic acid, 8g of diethylene glycol and 20g of pentaerythritol into a flask and stir at a stirring speed of 300rpm. Soybean oil acid and linoleic acid can improve the dryness and water resistance of the resin, and the end point is easy to control. Use water and xylene as reflux solvents, heat to 180°C, and after the temperature stabilizes, heat to 200°C for esterification reflux reaction. The reaction time is 4h. During this period, sample and determine the acid value every 1h and appropriately drain water or add xylene. When the acid value drops below 70mgKOH / g, controlling the acid value is beneficial to improving the durability of the resin product, and the adsorption capacity for other additives is stronger, which is beneficial to improving the comprehensive performance of the resin. Stop heating and reduce the stirring speed to 50rpm to obtain an alkyd resin;

[0059] b. Place the alkyd resin described in step a at room temperature below 80°C, maintain the stirring speed at 50rpm, and drop silane coupling agent KH570 within 30min, the addition amount of silane coupling agent KH570 is 6%, and maintain for 30min. The addition of silane coupling agent KH570 not only retains the room temperature curing of alkyd resin and the excellent physical and mechanical properties of the coating, but also significantly accelerates the drying speed of the coating, improves the quick-drying property, and also has heat resistance, durability, light and color retention, which is beneficial to the improvement of the comprehensive performance of alkyd resin materials. Then heat up to 180°C, start stirring, stir at a speed of 300rpm, and stir. The time is 3h. During this period, samples are taken every 30 minutes to determine the acid value and water is added or xylene is added appropriately. When the acid value drops below 40mgKOH / g, the heating and stirring are stopped, and 1 times the amount of deionized water is added. A high-speed disperser is used for uniform dispersion. During the high-speed dispersion process, the speed is 600rpm and the time is 1h. Uniform dispersion is beneficial to improving the size and uniformity of the particle size. At the same fixed content, the smaller the particle size and the smaller the distance between the particles, the faster the drying speed and the larger the specific surface area, which is beneficial to the mutual diffusion between the components during film formation, and the cross-linking degree is improved while shortening the drying time. Filter to obtain the silane coupling agent modified alkyd resin.

[0060] This embodiment provides a method for preparing a quick-drying road marking paint, which specifically comprises the following steps:

[0061] S1. Add cashew nut shell oil-modified rosin resin and silane coupling agent-modified alkyd resin into a four-necked flask equipped with a thermometer and a condenser to melt them. During the melting process, the temperature is controlled at 200° C. and the reaction time is 2 h. This meets the requirement that the raw materials should be mixed at 200° C. during the construction of hot-melt road marking paint. The resin material synthesized by the two has the advantages of quick drying, light color, high softening point and low brittleness, and is suitable as a film-forming substance for road marking paint to obtain a film-forming composite resin.

[0062] S2. The film-forming composite resin described in step S1 is uniformly mixed with titanium dioxide, talcum powder and calcium carbonate powder. The talcum powder is processed through a 300-mesh screen and the calcium carbonate powder is processed through a 400-mesh screen. Controlling the particle size is beneficial to improving the fluidity and mechanical strength of the filler. Stirring is continued under a melting condition of 145° C. After all are melted, glass microbeads and dioctyl phthalate are added. Dioctyl phthalate is used as a plasticizer to improve the flexibility and fluidity of the coating. However, adding too much can reduce the softening point of the coating. The temperature is raised to 170° C. and stirring is continued for 10 min. After all components are melted, the temperature is raised to 200° C. and kept warm for 30 s. The material is discharged to obtain a quick-drying road marking paint.

[0063] In this example, the prepared cashew nut shell oil modified rosin resin-silane coupling agent modified alkyd resin was subjected to scanning electron microscopy to observe its microscopic morphology. Figure 1 The SEM image of the cashew nut shell oil-modified rosin resin-silane coupling agent-modified alkyd resin prepared in Example 1 is magnified 400 times. As shown in the figure, the cashew nut shell oil-modified rosin resin-silane coupling agent-modified alkyd resin prepared in this example is a composite resin matrix with good compatibility.

[0064] Example 2

[0065] This embodiment provides a quick-drying road marking paint, comprising the following components in parts by weight: 10 parts of cashew nut shell oil-modified rosin resin, 5 parts of silane coupling agent-modified alkyd resin, 5 parts of titanium dioxide, 15 parts of talc, 15 parts of calcium carbonate powder, 15 parts of glass microspheres, and 1 part of dioctyl phthalate.

[0066] The cashew nut shell oil-modified rosin resin comprises the following components in parts by weight: 20 parts of rosin, 2 parts of fumaric acid, 3 parts of glycerol and 8 parts of cashew nut shell oil.

[0067] The silane coupling agent modified alkyd resin comprises the following components in parts by weight: 40 parts of alkyd resin and 1 part of silane coupling agent KH570.

[0068] The preparation method of cashew nut shell oil modified rosin resin specifically comprises the following steps:

[0069] (1) Add 60g of rosin into a four-necked flask equipped with a condenser, a thermometer and a stirrer, introduce nitrogen, heat to 150°C, start stirring to melt the floating rosin, add the remaining 40g of rosin after melting. Rosin is relatively cheap and easy to source, and can be used in various fields where odor requirements are not high. Add fumaric acid while stirring, then heat to control the temperature at 200°C, react for 1h, then add glycerol, heat to 260°C, react for 6h, discharge small molecules and water generated by esterification while reacting, evacuate, collect the remaining small molecule compounds, use fumaric acid and glycerol to undergo diene synthesis reaction and polyesterification reaction, reduce the acid value of the modified rosin, increase its softening point, and obtain rosin resin;

[0070] (2) The rosin resin, cashew nut shell oil and catalyst described in step (1) are added to a reaction kettle and stirred and mixed. The amount of cashew nut shell oil is 6% of the total amount of the reactants. The catalyst is dibutyltin dilaurate, and the amount is 0.1% of the total amount of the reactants. An efficient and low-toxic organic reaction result can be achieved, and the reaction efficiency is improved. The system temperature is controlled at 60°C. After dissolving into a solution, the temperature is raised to 80°C for reaction for 2h, and vacuum dehydration is performed at 70°C for 1h. The addition of cashew nut shell oil increases the crosslinking density and stability, which is beneficial to shortening the drying time, and improving the toughness and heat resistance of the rosin resin, thereby obtaining a cashew nut shell oil-modified rosin resin.

[0071] The preparation method of silane coupling agent modified alkyd resin specifically comprises the following steps:

[0072] a. Add 15g of phthalic anhydride, 4g of isophthalic acid, 20g of soybean oil acid, 15g of linoleic acid, 3g of diethylene glycol and 10g of pentaerythritol into a flask and stir at a stirring speed of 200rpm. Soybean oil acid and linoleic acid can improve the dryness and water resistance of the resin, and the end point is easy to control. Use water and xylene as reflux solvents, heat to 160°C, and after the temperature stabilizes, heat to 190°C for esterification reflux reaction. The reaction time is 3h. During this period, samples are taken every 1h to determine the acid value and water is appropriately released or xylene is added. When the acid value drops below 70mgKOH / g, controlling the acid value is beneficial to improving the durability of the resin product, and the adsorption capacity for other additives is stronger, which is beneficial to improving the comprehensive performance of the resin. Stop heating and reduce the stirring speed to 30rpm to obtain an alkyd resin;

[0073] b. Place the alkyd resin described in step a at room temperature below 80°C, maintain the stirring speed at 30rpm, and drop silane coupling agent KH570 within 20min, the addition amount of silane coupling agent KH570 is 4%, and maintain for 20min. The addition of silane coupling agent KH570 not only retains the room temperature curing of alkyd resin and the excellent physical and mechanical properties of the coating, but also significantly accelerates the drying speed of the coating, improves the quick-drying property, and also has heat resistance, durability, light and color retention, which is beneficial to the improvement of the comprehensive performance of alkyd resin materials. Then heat up to 140°C, start stirring, the stirring speed is 200rpm, and the stirring time is 20min. 2h, during which every 30min, take samples to determine the acid value and drain water or add xylene appropriately. When the acid value drops below 40mgKOH / g, stop heating and turn off stirring, add 0.5 times the amount of deionized water, and use a high-speed disperser to disperse evenly. During the high-speed dispersion process, the speed is 500rpm and the time is 0.5h. Uniform dispersion is beneficial to improving the size and uniformity of the particle size. Under the same fixed content, the smaller the particle size and the smaller the distance between the particles, the faster the drying speed and the larger the specific surface area, which is beneficial to the mutual diffusion between the components during film formation, improves the crosslinking degree and shortens the drying time. Filter to obtain the silane coupling agent modified alkyd resin.

[0074] This embodiment provides a method for preparing a quick-drying road marking paint, which specifically comprises the following steps:

[0075] S1. Add cashew nut shell oil-modified rosin resin and silane coupling agent-modified alkyd resin into a four-necked flask equipped with a thermometer and a condenser to melt them. During the melting process, the temperature is controlled at 180° C. and the reaction time is 1 h. This meets the requirement that the raw materials should be mixed at 200° C. during the construction of hot-melt road marking paint. The resin material synthesized by the two has the advantages of quick drying, light color, high softening point and low brittleness, and is suitable as a film-forming substance for road marking paint to obtain a film-forming composite resin.

[0076] S2. The film-forming composite resin described in step S1 is uniformly mixed with titanium dioxide, talcum powder and calcium carbonate powder. The talcum powder is processed through a 200-mesh screen and the calcium carbonate powder is processed through a 300-mesh screen. Controlling the particle size is beneficial to improving the fluidity and mechanical strength of the filler. Stirring is continued under a melting condition of 125° C. After all are melted, glass microbeads and dioctyl phthalate are added. Dioctyl phthalate is used as a plasticizer to improve the flexibility and fluidity of the coating. However, adding too much can reduce the softening point of the coating. The temperature is raised to 160° C. and stirring is continued for 5 minutes. After all components are melted, the temperature is raised to 200° C. and kept warm for 10 seconds. The material is discharged to obtain a quick-drying road marking paint.

[0077] Example 3

[0078] This embodiment provides a quick-drying road marking paint, comprising the following components in parts by weight: 15 parts of cashew nut shell oil-modified rosin resin, 7.5 parts of silane coupling agent-modified alkyd resin, 6.5 parts of titanium dioxide, 17.5 parts of talc, 17.5 parts of calcium carbonate powder, 17.5 parts of glass microspheres, and 1.5 parts of dioctyl phthalate.

[0079] The cashew nut shell oil-modified rosin resin comprises the following components in parts by weight: 30 parts of rosin, 4 parts of fumaric acid, 5 parts of glycerin and 12 parts of cashew nut shell oil.

[0080] The silane coupling agent modified alkyd resin comprises the following components in parts by weight: 45 parts of alkyd resin and 2 parts of silane coupling agent KH570.

[0081] The preparation method of cashew nut shell oil modified rosin resin specifically comprises the following steps:

[0082] (1) 60 g of rosin is added to a four-necked flask equipped with a condenser, a thermometer and a stirrer, nitrogen is introduced, the temperature is raised to 175°C, stirring is started to melt the floating rosin, and the remaining 40 g of rosin is added after melting. Rosin is relatively cheap and easily available, and can be used in various fields where odor requirements are not high. Fumaric acid is added while stirring, and the temperature is raised to control the temperature at 200°C for 1.5 hours. Then glycerol is added and the temperature is raised to 265°C for 6.5 hours. Small molecules and water generated by esterification are discharged while reacting, and vacuum is drawn to collect the remaining small molecule compounds. Fumaric acid and glycerol are used to undergo diene synthesis reaction and polyesterification reaction to reduce the acid value of the modified rosin and increase its softening point to obtain rosin resin;

[0083] (2) The rosin resin, cashew nut shell oil and catalyst described in step (1) are added to a reaction kettle and stirred and mixed. The amount of cashew nut shell oil is 7% of the total amount of the reactants. The catalyst is dibutyltin dilaurate, and the amount is 0.3% of the total amount of the reactants. An efficient and low-toxic organic reaction result can be achieved, and the reaction efficiency is improved. The system temperature is controlled at 70°C. After dissolving into a solution, the temperature is raised to 90°C for reaction for 4 hours, and vacuum dehydration is performed at 80°C for 2 hours. The addition of cashew nut shell oil increases the crosslinking density and stability, which is beneficial to shortening the drying time, and improving the toughness and heat resistance of the rosin resin, thereby obtaining a cashew nut shell oil-modified rosin resin.

[0084] The preparation method of silane coupling agent modified alkyd resin specifically comprises the following steps:

[0085] a. Add 16.5g phthalic anhydride, 5g isophthalic acid, 25g soybean oil acid, 17.5g linoleic acid, 5.5g diethylene glycol and 15g pentaerythritol into a flask and stir at a stirring speed of 250rpm. Soybean oil acid and linoleic acid can improve the dryness and water resistance of the resin, and the end point is easy to control. Use water and xylene as reflux solvents, heat to 170°C, and after the temperature stabilizes, heat to 195°C for esterification reflux reaction. The reaction time is 3.5h. During this period, sample and determine the acid value every 1h and appropriately drain water or add xylene. When the acid value drops below 70mgKOH / g, controlling the acid value is beneficial to improving the durability of the resin product, and the adsorption capacity for other additives is stronger, which is beneficial to improving the comprehensive performance of the resin. Stop heating and reduce the stirring speed to 40rpm to obtain an alkyd resin;

[0086] b. Place the alkyd resin in step a at room temperature below 80°C, maintain the stirring speed at 40rpm, and drop silane coupling agent KH570 within 25min, the addition amount of silane coupling agent KH570 is 5%, maintain 25min, the addition of silane coupling agent KH570 not only retains the room temperature curing of alkyd resin and the excellent physical and mechanical properties of the coating, but also the presence of double bonds makes the coating drying speed significantly faster, improves the quick-drying property, and also has heat resistance, durability, light and color retention, which is beneficial to the improvement of the comprehensive performance of alkyd resin materials, then heat up to 160°C, start stirring, stirring speed 250rpm, stirring time 2. 5h, during which every 30min, take samples to determine the acid value and drain water or add xylene appropriately. When the acid value drops below 40mgKOH / g, stop heating and turn off stirring, add 0.75 times the amount of deionized water, and use a high-speed disperser to disperse evenly. During the high-speed dispersion process, the speed is 550rpm and the time is 0.75h. Uniform dispersion is beneficial to improving the size and uniformity of the particle size. Under the same fixed content, the smaller the particle size and the smaller the distance between the particles, the faster the drying speed and the larger the specific surface area, which is beneficial to the mutual diffusion between the components during film formation, improves the crosslinking degree and shortens the drying time. Filter to obtain the silane coupling agent modified alkyd resin.

[0087] This embodiment provides a method for preparing a quick-drying road marking paint, which specifically comprises the following steps:

[0088] S1. Add cashew nut shell oil-modified rosin resin and silane coupling agent-modified alkyd resin into a four-necked flask equipped with a thermometer and a condenser to melt them. During the melting process, the temperature is controlled at 190° C. and the reaction time is 1.5 h. This meets the requirement that the raw materials should be mixed at 200° C. during the construction of hot-melt road marking paint. The resin material synthesized by the two has the advantages of quick drying, light color, high softening point and low brittleness, and is suitable as a film-forming substance for road marking paint to obtain a film-forming composite resin.

[0089] S2. The film-forming composite resin described in step S1 is uniformly mixed with titanium dioxide, talcum powder and calcium carbonate powder. The talcum powder is processed through a 250-mesh screen and the calcium carbonate powder is processed through a 350-mesh screen. Controlling the particle size is beneficial to improving the fluidity and mechanical strength of the filler. Stirring is continued at 135° C. when the mixture is melted. After all the mixture is melted, glass microbeads and dioctyl phthalate are added. Dioctyl phthalate is used as a plasticizer to improve the flexibility and fluidity of the coating. However, adding too much dioctyl phthalate can reduce the softening point of the coating. The mixture is heated to 165° C. and stirred for 7.5 min. After all the components are melted, the mixture is heated to 200° C. and kept warm for 20 s. The mixture is discharged to obtain a quick-drying road marking coating.

[0090] Example 4

[0091] This embodiment provides a quick-drying road marking paint, comprising the following components in parts by weight: 20 parts of cashew nut shell oil-modified rosin resin, 10 parts of silane coupling agent-modified alkyd resin, 8 parts of titanium dioxide, 20 parts of talc powder, 20 parts of calcium carbonate powder, 20 parts of glass microspheres, and 2 parts of dioctyl phthalate.

[0092] The cashew nut shell oil-modified rosin resin comprises the following components in parts by weight: 40 parts of rosin, 6 parts of fumaric acid, 7 parts of glycerin and 8 parts of cashew nut shell oil.

[0093] The silane coupling agent modified alkyd resin comprises the following components in parts by weight: 50 parts of alkyd resin and 1 part of silane coupling agent KH570.

[0094] The preparation method of cashew nut shell oil modified rosin resin specifically comprises the following steps:

[0095] (1) Add 60g of rosin into a four-necked flask equipped with a condenser, a thermometer and a stirrer, introduce nitrogen, heat to 200°C, start stirring to melt the floating rosin, add the remaining 40g of rosin after melting. Rosin is relatively cheap and easy to source, and can be used in various fields where odor requirements are not high. Add fumaric acid while stirring, then heat to control the temperature at 200°C, react for 1h, then add glycerol, heat to 270°C, react for 6h, discharge small molecules and water generated by esterification while reacting, evacuate, collect the remaining small molecule compounds, use fumaric acid and glycerol to undergo diene synthesis reaction and polyesterification reaction, reduce the acid value of the modified rosin, increase its softening point, and obtain rosin resin;

[0096] (2) The rosin resin, cashew nut shell oil and catalyst described in step (1) are added to a reaction kettle and stirred and mixed. The amount of cashew nut shell oil is 6% of the total amount of the reactants. The catalyst is dibutyltin dilaurate, and the amount is 0.5% of the total amount of the reactants. High-efficiency and low-toxicity organic reaction results can be achieved, and the reaction efficiency is improved. The system temperature is controlled at 80°C. After dissolving into a solution, the temperature is raised to 100°C for reaction for 2h, and vacuum dehydration is performed at 90°C for 1h. The addition of cashew nut shell oil increases the crosslinking density and stability, which is beneficial to shortening the drying time, and improving the toughness and heat resistance of the rosin resin, thereby obtaining a cashew nut shell oil-modified rosin resin.

[0097] The preparation method of silane coupling agent modified alkyd resin specifically comprises the following steps:

[0098] a. Add 18g of phthalic anhydride, 6g of isophthalic acid, 30g of soybean oil acid, 20g of linoleic acid, 8g of diethylene glycol and 20g of pentaerythritol into a flask and stir at a stirring speed of 300rpm. Soybean oil acid and linoleic acid can improve the dryness and water resistance of the resin, and the end point is easy to control. Use water and xylene as reflux solvents, heat to 180°C, and after the temperature stabilizes, heat to 200°C for esterification reflux reaction. The reaction time is 3h. During this period, samples are taken every 1h to determine the acid value and water is appropriately released or xylene is added. When the acid value drops below 70mgKOH / g, controlling the acid value is beneficial to improving the durability of the resin product, and the adsorption capacity for other additives is stronger, which is beneficial to improving the comprehensive performance of the resin. Stop heating and reduce the stirring speed to 50rpm to obtain an alkyd resin;

[0099] b. Place the alkyd resin described in step a at room temperature below 80°C, maintain the stirring speed at 50rpm, and drop silane coupling agent KH570 within 30min, the addition amount of silane coupling agent KH570 is 4%, and maintain for 20min. The addition of silane coupling agent KH570 not only retains the room temperature curing of alkyd resin and the excellent physical and mechanical properties of the coating, but also significantly accelerates the drying speed of the coating, improves the quick-drying property, and also has heat resistance, durability, light and color retention, which is beneficial to the improvement of the comprehensive performance of alkyd resin materials. Then heat up to 180°C, start stirring, and stir at a speed of 300rpm. When stirring, The mixture was dried for 2 hours, and every 30 minutes, samples were taken to determine the acid value and water was added or xylene was added appropriately. When the acid value dropped below 40 mgKOH / g, heating and stirring were stopped, and 1 time amount of deionized water was added. The mixture was evenly dispersed using a high-speed disperser. During the high-speed dispersion process, the speed was 600 rpm and the time was 0.5 h. Even dispersion was beneficial to improving the size and uniformity of the particle size. Under the same fixed content, the smaller the particle size and the smaller the distance between the particles, the faster the drying speed and the larger the specific surface area, which was beneficial to the mutual diffusion between the components during film formation, and the crosslinking degree was increased while the drying time was shortened. The mixture was filtered to obtain the silane coupling agent modified alkyd resin.

[0100] This embodiment provides a method for preparing a quick-drying road marking paint, which specifically comprises the following steps:

[0101] S1. Adding cashew nut shell oil-modified rosin resin and silane coupling agent-modified alkyd resin into a four-necked flask equipped with a thermometer and a condenser to melt them. During the melting process, the temperature is controlled at 200° C. and the reaction time is 1 h. This meets the requirement that the raw materials should be mixed at 200° C. during the construction of hot-melt road marking paint. The resin material synthesized by the two has the advantages of quick drying, light color, high softening point and low brittleness, and is suitable as a film-forming substance for road marking paint to obtain a film-forming composite resin.

[0102] S2. The film-forming composite resin described in step S1 is uniformly mixed with titanium dioxide, talcum powder and calcium carbonate powder. The talcum powder is processed through a 300-mesh screen and the calcium carbonate powder is processed through a 400-mesh screen. Controlling the particle size is beneficial to improving the fluidity and mechanical strength of the filler. Stirring is continued under a melting condition of 145° C. After all are melted, glass microbeads and dioctyl phthalate are added. Dioctyl phthalate is used as a plasticizer to improve the flexibility and fluidity of the coating. However, adding too much can reduce the softening point of the coating. The temperature is raised to 170° C. and stirring is continued for 10 min. After all components are melted, the temperature is raised to 200° C. and kept warm for 30 s. The material is discharged to obtain a quick-drying road marking paint.

[0103] Comparative Example 1

[0104] This comparative example provides a quick-drying road marking paint, which is different from Example 1 in that the quick-drying road marking paint does not contain cashew nut shell oil-modified rosin resin; the preparation method of the silane coupling agent-modified alkyd resin is the same as that of Example 1; and the preparation method of the quick-drying road marking paint is the same as that of Example 1.

[0105] Comparative Example 2

[0106] This comparative example provides a quick-drying road marking paint, which is different from Example 1 in that the quick-drying road marking paint does not contain a silane coupling agent-modified alkyd resin; the preparation method of the cashew nut shell oil-modified rosin resin is the same as that of Example 1; and the preparation method of the quick-drying road marking paint is the same as that of Example 1.

[0107] Comparative Example 3

[0108] This comparative example provides a quick-drying road marking paint, which is different from Example 1 in that the cashew nut shell oil-modified rosin resin does not contain cashew nut shell oil and the silane coupling agent-modified alkyd resin does not contain silane coupling agent KH570; the preparation method of the cashew nut shell oil-modified rosin resin does not include step (2); the preparation method of the silane coupling agent-modified alkyd resin does not include step b; and the preparation method of the quick-drying road marking paint is the same as that of Example 1.

[0109] Experimental Example 1

[0110] Non-stick tire drying time experiment

[0111] Test samples: quick-drying road marking paints prepared in Examples 1-4 and Comparative Examples 1-3.

[0112] Test method: Place the hot melt paint scraper at the center of the long side of a 200mm×150mm×5mm cement asbestos board, and immediately pour the test sample into the scraper, then move the scraper horizontally to make a layer parallel to the short side of the cement asbestos board, with a thickness of 1.5-2.0mm and a width of 80mm. Immediately after the preparation is completed, press the stopwatch to start timing. Test after 3 minutes. Roll the measuring instrument from the center of one end of the short side of the test board to the other end for 1s. Avoid applying external force to the coating during rolling. Then visually inspect the tire of the measuring instrument for sticky test material. If there is sticky material, wipe it clean with a cotton cloth moistened with acetone or methyl ethyl ketone. Repeat the experiment every 30s until the tire is no longer sticky to the test material. Stop the stopwatch. This time is the non-stick tire drying time (min).

[0113] Figure 2 The non-stick tire drying time result diagram of Examples 1-4 and Comparative Examples 1-3; as shown in the figure, the non-stick tire drying time of Examples 1-4 is 3-4.5min, indicating that the drying time is short; the non-stick tire drying time of Comparative Examples 1-3 is 5.5-8min, indicating that the drying time is long; the quick-drying road marking paint of Comparative Example 1 does not contain cashew nut shell oil modified rosin resin, and cannot be cross-linked with silane coupling agent modified alkyd resin, which reduces the cross-linking density, is not conducive to the mutual diffusion between components, and leads to a long drying time; the quick-drying road marking paint of Comparative Example 2 does not contain silane coupling agent modified alkyd resin, and cannot be cross-linked with cashew nut shell oil modified rosin resin, which reduces the cross-linking density, resulting in a long drying time; the quick-drying road marking paint of Comparative Example 3 does not contain cashew nut shell oil and silane coupling agent KH570, and does not contain addition reaction of silicon monomer and double bond, which reduces the drying speed, and also weakens the cross-linking density and fluidity, which is not conducive to drying efficiency, resulting in a long drying time.

[0114] Experimental Example 2

[0115] Flexibility test

[0116] Test samples: quick-drying road marking paints prepared in Examples 1-4 and Comparative Examples 1-3.

[0117] Test method: Test the test sample in accordance with GB / T1731-2020. After bending, observe the coating film with a 4x magnifying glass to grade its flexibility.

[0118] Figure 3It is a flexibility result diagram of Examples 1-4 and Comparative Examples 1-3; as shown in the figure, the flexibility of Examples 1-4 is 10-15 mm, indicating that the flexibility is good; the flexibility of Comparative Examples 1-3 is 4-5 mm, indicating that the flexibility is general; the quick-drying road marking paint of Comparative Example 1 does not contain cashew nut shell oil modified rosin resin, and cannot cooperate with the silane coupling agent modified alkyd resin to play a toughening effect, resulting in general flexibility; the quick-drying road marking paint of Comparative Example 2 does not contain silane coupling agent modified alkyd resin, which is not conducive to coordinating the cashew nut shell oil modified rosin resin to improve the toughening effect, resulting in general flexibility; the quick-drying road marking paint of Comparative Example 3 does not contain cashew nut shell oil and silane coupling agent KH570, which cannot improve the brittleness of rosin resin, is not conducive to improving the compatibility of rosin resin and alkyd resin, is not conducive to improving the comprehensive performance of film-forming composite resin, and results in general flexibility.

[0119] Experimental Example 3

[0120] Durability test

[0121] Test samples: quick-drying road marking paints prepared in Examples 1-4 and Comparative Examples 1-3.

[0122] Test method:

[0123] (1) Water resistance: Prepare the test sample according to the size of 60mm×60mm×5mm. According to GB / T1733 "Determination of water resistance of paint film", put the sample into a glass water tank filled with deionized water, so that two-thirds of the length of the sample is immersed in water, and keep the water temperature at about 20-25℃. After immersion for 24 hours, take it out, absorb the water with filter paper, and observe whether there is loss of gloss, discoloration, bubbles, wrinkles, shedding, rust, etc. on the surface;

[0124] (2) Heat resistance: Pour the test sample into a metal container and heat it to 180-220℃ to make it completely melted. Ensure that the test sample coating is uniform and free of bubbles in the metal container. Then keep it warm at 200±10℃ for 4 hours. After the heat is over, use a "DrLange" MicroColorLMC spectrocolorimeter type device to measure the yellowing index of the test sample.

[0125] Figure 4 The water resistance comparison results of Examples 1-4 and Comparative Examples 1-3 are shown in FIG. 1-7, respectively; Figure 5 The yellowing index results of Examples 1-4 and Comparative Examples 1-3 are shown in FIG. Figure 4 , Examples 1-4 did not have obvious gloss loss, discoloration, bubbles, wrinkles, shedding, rust, etc. Figure 5 , the yellowing index of Examples 1-4 is 0.6-1.5, and no yellowing occurs, indicating good water resistance and heat resistance, and thus good durability; Figure 4 , Comparative Examples 1-3 have some small pores, such as Figure 5 , the yellowing index of comparative examples 1-3 is 2-3, and there is yellowing phenomenon, indicating that the water resistance and heat resistance are poor, and thus the durability is general; the quick-drying road marking paint of comparative example 1 does not contain cashew nut shell oil-modified rosin resin, which is not conducive to the close combination of the components, reduces the heat resistance and wear resistance, and also weakens the water resistance, resulting in poor water resistance and heat resistance, and thus the durability is general; the quick-drying road marking paint of comparative example 2 does not contain silane coupling agent-modified alkyd resin, which is not conducive to the comprehensive film-forming composite resin The improvement of the comprehensive performance leads to poor water resistance and heat resistance, and thus the durability is general; the quick-drying road marking paint of Comparative Example 3 does not contain cashew nut shell oil and silane coupling agent KH570. The lack of cashew nut shell oil is not conducive to improving the heat resistance and water resistance of rosin resin. The lack of introduction of silicon element also weakens the water resistance and heat resistance of alkyd resin, and is not conducive to the compatibility effect of film-forming composite resin, which in turn has a negative effect on its related properties, resulting in poor water resistance and heat resistance, and thus the durability is general.

[0126] The above experimental results show that the non-stick tire drying time, flexibility and durability of Examples 1-4 of the present invention are significantly better than those of Comparative Examples 1-3. Among them, the non-stick tire drying time of Example 1 using cashew nut shell oil-modified rosin resin and silane coupling agent-modified alkyd resin is shorter, and the flexibility and durability are better. The aromatic ring and long fatty chain structure of cardanol in the cashew nut shell oil-modified rosin resin help to improve the brittleness of the rosin resin and achieve a toughening effect. Cashew nut shell oil can be cross-linked with the silane coupling agent-modified alkyd resin to increase the cross-linking density. It helps to shorten the drying time and improve quick-drying properties. In the silane coupling agent modified alkyd resin, the silane coupling agent KH570 has a polycondensation reaction of silicon monomers and an addition reaction of double bonds, which significantly accelerates the drying speed. The introduction of silicon elements improves water resistance and heat resistance, and is not easily aged by conditions such as light and heat, thereby improving the defect of poor heat resistance of alkyd resin. The silane coupling agent KH570 can also improve the compatibility between cashew nut shell oil modified rosin resin and silane coupling agent modified alkyd resin, has a defoaming effect, and is beneficial to the improvement of the comprehensive performance of the film-forming composite resin.

[0127] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0128] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A quick-drying road marking paint, characterized in that: The quick-drying road marking paint comprises the following components in parts by weight: 10-20 parts of cashew nut shell oil-modified rosin resin, 5-10 parts of silane coupling agent-modified alkyd resin, 5-8 parts of titanium dioxide, 15-20 parts of talc, 15-20 parts of calcium carbonate powder, 15-20 parts of glass microspheres, and 1-2 parts of dioctyl phthalate; the cashew nut shell oil-modified rosin resin comprises the following components in parts by weight: 20-40 parts of rosin, 2-6 parts of fumaric acid, 3-7 parts of glycerol, and 8-16 parts of cashew nut shell oil; the silane coupling agent-modified alkyd resin comprises the following components in parts by weight: 40-50 parts of alkyd resin and 1-3 parts of silane coupling agent KH570; The preparation method of the silane coupling agent modified alkyd resin specifically comprises the following steps: a. Add 15-18g of phthalic anhydride, 4-6g of isophthalic acid, 20-30g of soybean oil acid, 15-20g of linoleic acid, 3-8g of diethylene glycol and 10-20g of pentaerythritol into a flask and stir at a stirring speed of 200-300rpm. Use water and xylene as reflux solvents, raise the temperature to 160-180°C, and after the temperature stabilizes, raise the temperature to 190-200°C for esterification reflux reaction. The reaction time is 3-4h. During this period, samples are taken every 1h to determine the acid value and water is appropriately added or xylene is added. When the acid value drops below 70mgKOH / g, stop heating and reduce the stirring speed to 30-50rpm to obtain an alkyd resin; b. Place the alkyd resin in step a at room temperature and lower it to below 80° C., maintain the stirring speed at 30-50 rpm, and drop silane coupling agent KH570 within 20-30 min, the addition amount of silane coupling agent KH570 is 4-6%, maintain for 20-30 min, then raise the temperature to 140-180° C., start stirring, the stirring speed is 200-300 rpm, and the stirring time is 2-3 h. During this period, sample and determine the acid value every 30 min, and drain or add xylene appropriately. When the acid value drops to below 40 mgKOH / g, stop heating and turn off stirring, add 0.5-1 times the amount of deionized water, use a high-speed disperser to evenly disperse, and filter to obtain a silane coupling agent modified alkyd resin.

2. A method for preparing the quick-drying road marking paint according to claim 1, characterized in that: The specific steps include: S1, adding cashew nut shell oil modified rosin resin and silane coupling agent modified alkyd resin into a four-necked flask equipped with a thermometer and a condenser, melting them to obtain a film-forming composite resin; S2, the film-forming composite resin described in step S1 is uniformly mixed with titanium dioxide, talcum powder, and calcium carbonate powder, and the mixture is stirred at 125-145° C., and after all the mixture is melted, glass beads and dioctyl phthalate are added, and the mixture is heated to 160-170° C., and stirred for 5-10 min. After all the components are melted, the mixture is heated to 200° C., and kept warm for 10-30 s, and the mixture is discharged to obtain a quick-drying road marking paint; The preparation method of the silane coupling agent modified alkyd resin specifically comprises the following steps: a. Add 15-18g of phthalic anhydride, 4-6g of isophthalic acid, 20-30g of soybean oil acid, 15-20g of linoleic acid, 3-8g of diethylene glycol and 10-20g of pentaerythritol into a flask and stir at a stirring speed of 200-300rpm. Use water and xylene as reflux solvents, raise the temperature to 160-180°C, and after the temperature stabilizes, raise the temperature to 190-200°C for esterification reflux reaction. The reaction time is 3-4h. During this period, samples are taken every 1h to determine the acid value and water is appropriately added or xylene is added. When the acid value drops below 70mgKOH / g, stop heating and reduce the stirring speed to 30-50rpm to obtain an alkyd resin; b. Place the alkyd resin in step a at room temperature and lower it to below 80° C., maintain the stirring speed at 30-50 rpm, and drop silane coupling agent KH570 within 20-30 min, the addition amount of silane coupling agent KH570 is 4-6%, maintain for 20-30 min, then raise the temperature to 140-180° C., start stirring, the stirring speed is 200-300 rpm, and the stirring time is 2-3 h. During this period, sample and determine the acid value every 30 min, and drain or add xylene appropriately. When the acid value drops to below 40 mgKOH / g, stop heating and turn off stirring, add 0.5-1 times the amount of deionized water, use a high-speed disperser to evenly disperse, and filter to obtain a silane coupling agent modified alkyd resin.

3. The method for preparing the quick-drying road marking paint according to claim 2, characterized in that: In step S1, during the melting process, the temperature is controlled at 180-200°C and the reaction time is 1-2h.

4. The method for preparing the quick-drying road marking paint according to claim 3, characterized in that: In step S2, talcum powder is processed through a 200-300 mesh screen, and calcium carbonate powder is processed through a 300-400 mesh screen.

5. The method for preparing the quick-drying road marking paint according to claim 4, characterized in that: The preparation method of the cashew nut shell oil-modified rosin resin specifically comprises the following steps: (1) Add 60g of rosin into a four-necked flask equipped with a condenser, a thermometer and a stirrer, introduce nitrogen, heat to 150-200°C, start stirring to melt the floating rosin, add the remaining 40g of rosin after melting, add fumaric acid while stirring, then heat to control the temperature at 200°C, react for 1-2h, then add glycerol, heat to 260-270°C, react for 6-7h, discharge small molecules and water generated by esterification while reacting, evacuate, collect the remaining small molecule compounds, and obtain rosin resin; (2) Add the rosin resin, cashew nut shell oil and catalyst described in step (1) into a reaction kettle and stir and mix. The amount of cashew nut shell oil is 6-8% of the total amount of reactants. The system temperature is controlled at 60-80°C. After dissolving into a solution, the temperature is raised to 80-100°C for reaction for 2-6 hours, and vacuum dehydration is performed at 70-90°C for 1-3 hours to obtain cashew nut shell oil-modified rosin resin.

6. The method for preparing the quick-drying road marking paint according to claim 5, characterized in that: In step (2), the catalyst is dibutyltin dilaurate, and the amount used is 0.1-0.5% of the total amount of the reactants.

7. The method for preparing the quick-drying road marking paint according to claim 6, characterized in that: In step b, during the high-speed dispersion process, the rotation speed is 500-600 rpm and the time is 0.5-1 h.

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