Preparation method of hot-melt road marking paint

Abstract

The invention relates to a preparation method of a hot-melt road marking coating, and belongs to the technical field of coatings. The method solves the problems of improper raw material selection, inaccurate temperature control in the heating and melting process, insufficient mixing and stirring uniformity and the like in the preparation of the existing hot melt coating. The method comprises the specific steps of raw material preparation, heating and melting, mixing and stirring, primer coating, melt coating, reflective glass bead spreading, natural cooling and curing, and finishing and inspection. Optimized process parameters ensure that the coating has good adhesion, flexibility and wear resistance, and the risk of crack generation is remarkably reduced. The strength and stability of the coating are improved by reasonably selecting fillers, pigments and auxiliaries and controlling the solid content and the like. Finally, the method significantly improves the performance and durability of the hot-melt road marking paint, and meets the high-standard requirements of modern road marking.

Description

Technical Field

[0001] The invention provides a preparation method, belongs to the technical field of hot-melt road marking paint, and particularly relates to a preparation method of hot-melt road marking paint. Background Art

[0002] Hot-melt road marking paint is a high-performance paint used for road marking construction. It is mainly composed of synthetic resin, coloring pigment, body pigment (filler), reflective material and various additives. It is melted by heating to a certain temperature, and then applied to the road surface with special equipment. After natural cooling and solidification, it forms a durable marking. It has the characteristics of quick drying, wear resistance, reflection and anti-skid. It is suitable for the marking of various road traffic markings and signs. It is widely used in modern road marking construction due to its excellent performance.

[0003] The existing preparation process of hot-melt road marking paint is mostly based on the traditional single petroleum resin or synthetic resin system. However, the current process has shortcomings in many aspects: the selection of raw materials does not meet the performance requirements; the heating and melting process lacks precise temperature control; the uniformity during the mixing and stirring process is insufficient; the volume concentration of fillers and pigments has not been systematically optimized; the type and amount of additives are unreasonable; the temperature control during the construction process is not strict enough; the curing time is not optimized; and the final finishing and quality inspection links are not detailed enough. These factors together lead to defects such as cracks in the actual use of the paint, which affects its performance and life. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application provide a method for preparing a hot-melt road marking paint, thereby solving many deficiencies of the method for preparing a hot-melt road marking paint in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a hot-melt road marking paint, comprising the following steps:

[0006] a. Raw material preparation, selection of resin, pigment, filler, reflective material, additives and other ingredients, wherein the resin is selected from petroleum resin, synthetic resin or a mixture thereof;

[0007] b. Heating and melting, heating the solid raw material to 180-220°C to form a molten state;

[0008] c. Mixing and stirring, continuously stirring the molten raw materials to form a uniform molten coating, and the stirring speed is controlled at 100-300 rpm;

[0009] d. Apply primer, apply the primer on the clean and dry road surface, the solid content of the primer is 40-60%;

[0010] e. Melt coating: Use the marking equipment to evenly coat the molten coating on the road surface, and the coating thickness is controlled at 1.5-2.0mm;

[0011] f. Spread reflective glass beads evenly on the applied hot melt coating. The particle size of the glass beads is 0.1-0.3mm;

[0012] g. Natural cooling and curing, allowing the applied hot melt coating to cool and cure in a natural environment, with the curing time controlled within 15-30 minutes;

[0013] h. Trim and inspect the markings after curing to ensure that they are crack-free and have uniform thickness.

[0014] Preferably, the filler in step a comprises particles with a relatively large particle size, and the pigment volume concentration of the filler is controlled at 50-70%.

[0015] Preferably, the auxiliary agent in step a comprises a plasticizer, a flow aid or a mixture thereof, the added amount of the plasticizer is 5-15% of the mass of the resin, and the added amount of the flow aid is 1-5% of the mass of the resin.

[0016] Preferably, the other ingredients in step a include but are not limited to SiO2 and TiO2, and the addition amount of the other ingredients is 1-10% of the mass of the resin.

[0017] Preferably, the temperature in step b is controlled between 180-210°C.

[0018] Preferably, the road surface temperature in step e is maintained above 5°C.

[0019] Preferably, the solid content of the coating in step a is 60-75%.

[0020] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0021] The present invention improves the adhesion, flexibility and wear resistance of the coating and reduces the generation of cracks by selecting a mixture of petroleum resin and synthetic resin. The heating and melting process is strictly controlled at 180-220°C to avoid cracks caused by overheating. The stirring speed is controlled at 100-300 rpm to ensure that the components are evenly distributed and improve the uniformity and crack resistance of the coating. In addition, the volume concentration of fillers and pigments is optimized at 50-70% to enhance the strength and stability of the coating. The type and amount of additives are reasonably designed to improve the flexibility and fluidity of the coating. During the construction process, the road surface temperature is strictly controlled to be above 5°C to ensure that the performance of the coating is not affected by low temperature, and the curing time is controlled to 15-30 minutes to avoid insufficient curing. Finally, finishing and quality inspection are strengthened to ensure that the marking line is crack-free and has uniform thickness. These measures significantly improve the construction performance and durability of the coating and meet the needs of modern road markings.

[0022] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of a method for preparing a hot-melt road marking paint according to the present invention;

[0024] Figure 2 It is a partial enlarged view of a special control step of a method for preparing a hot-melt road marking paint according to the present invention;

[0025] Figure 3 It is a partial enlarged view of the construction steps of a method for preparing a hot-melt road marking paint according to the present invention;

[0026] Figure 4 This is a partial enlarged view of the quality control steps of a method for preparing a hot-melt road marking paint according to the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] like Figure 1 As shown, a method for preparing a hot-melt road marking paint includes the following steps: first, preparing raw materials, selecting suitable resins (such as petroleum resins, synthetic resins or mixtures thereof), pigments, fillers, reflective materials, additives and other ingredients. The carefully selected raw material combination can ensure that the paint has superior performance and durability.

[0031] Secondly, the solid raw materials are heated to 180-210°C to ensure that the raw materials are fully melted without overheating, thereby maintaining the stability of the coating. Subsequently, the stirring speed is controlled between 100-300 rpm to ensure that the components of the molten coating are evenly distributed and reduce performance differences. A primer with a solid content of 40-60% is evenly applied on a clean and dry road surface to improve the adhesion of the coating. After that, the molten coating is evenly applied to the road surface through a marking device to ensure that the coating thickness is controlled between 1.5-2.0mm to ensure the effectiveness of the marking line, and then, reflective glass beads with a particle size of 0.1-0.3mm are evenly spread on the coating surface to enhance the reflective effect of the marking line. After that, the applied coating is allowed to cool and solidify under natural conditions, and the curing time is controlled within 15-30 minutes to ensure perfect curing and performance of the coating.

[0032] Finally, the cured road markings are trimmed and quality checked to ensure that they are crack-free and of uniform thickness. By optimizing the volume concentration of fillers and pigments to 50-70%, and using plasticizers and flow aids at 5-15% and 1-5% of the resin mass, the flexibility and fluidity of the coating are increased. In addition, by keeping the road surface temperature above 5°C and ensuring that the solid content of the coating reaches 60-75%, the impact of low temperatures on construction quality is avoided, thereby improving the durability and reliability of the coating.

[0033] In this embodiment, by selecting petroleum resin, synthetic resin or a mixture thereof as the resin base material, the basic properties of the coating, such as adhesion, flexibility and wear resistance, are ensured, and these properties help reduce the generation of cracks; in the heating and melting step, the temperature is precisely controlled within the range of 180-220°C to ensure that the coating is completely melted without overheating, thereby avoiding cracks caused by improper temperature control; during the stirring process, the stirring speed is controlled within 100-300 rpm to ensure the uniform distribution of the components in the coating, reduce the local performance differences caused by uneven stirring, and thus reduce the risk of cracks; the pigment volume concentration of the filler is controlled within 50-70%, and this high proportion of fillers increases the strength and stability of the coating and helps to resist the formation of cracks; by adding an appropriate amount of plasticizer and flow aid, the flexibility and fluidity of the coating are improved, and the addition amount of these additives is precisely controlled within 5-15% of the resin mass. % and 1-5% to ensure the uniformity and adhesion of the coating during construction and reduce the occurrence of cracks; add SiO2, TiO2 and other materials, the addition of these materials is controlled at 1-10% of the resin mass, which enhances the weather resistance and temperature change resistance of the coating, thereby improving the crack resistance of the marking line; during the construction process, the road surface temperature is controlled above 5°C to avoid the degradation of coating performance and increase of internal stress caused by too low temperature, thereby reducing the occurrence of cracks; the curing time of the coating in a natural environment is controlled within 15-30 minutes to ensure the full curing of the coating and avoid cracks caused by insufficient or too fast curing; the solid content of the coating is controlled at 60-75%, and the high solid content helps to improve the durability and wear resistance of the coating and reduce cracks caused by insufficient coating performance; after the construction is completed, detailed finishing and quality inspection are carried out to ensure that the marking line is crack-free and of uniform thickness, and possible crack problems are discovered and dealt with in a timely manner.

[0034] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A method for preparing a hot-melt road marking paint, characterized in that: The following steps are involved: a. Raw material preparation, selection of resin, pigment, filler, reflective material, additives and other ingredients, wherein the resin is selected from petroleum resin, synthetic resin or a mixture thereof; b. Heating and melting, heating the solid raw material to 180-220°C to form a molten state; c. Mixing and stirring, continuously stirring the molten raw materials to form a uniform molten coating, and the stirring speed is controlled at 100-300 rpm; d. Apply primer, apply the primer on the clean and dry road surface, the solid content of the primer is 40-60%; e. Melt coating: Use the marking equipment to evenly coat the molten coating on the road surface, and the coating thickness is controlled at 1.5-2.0mm; f. Spread reflective glass beads evenly on the applied hot melt coating. The particle size of the glass beads is 0.1-0.3mm; g. Natural cooling and curing, allowing the applied hot melt coating to cool and cure in a natural environment, with the curing time controlled within 15-30 minutes; h. Trim and inspect the markings after curing to ensure that they are crack-free and have uniform thickness.

2. The method for preparing a hot-melt road marking paint according to claim 1, characterized in that: The filler in step a comprises particles with a relatively large particle size, and the pigment volume concentration of the filler is controlled at 50-70%.

3. The method for preparing a hot-melt road marking paint according to claim 1, characterized in that: The auxiliary agent in step a includes a plasticizer, a flow aid or a mixture thereof. The amount of the plasticizer added is 5-15% of the mass of the resin, and the amount of the flow aid added is 1-5% of the mass of the resin.

4. The method for preparing a hot-melt road marking paint according to claim 1, characterized in that: The other ingredients described in step a include but are not limited to SiO2 and TiO2, and the addition amount of the other ingredients is 1-10% of the mass of the resin.

5. The method for preparing a hot-melt road marking paint according to claim 1, characterized in that: The temperature in step b is controlled between 180-210°C.

6. The method for preparing a hot-melt road marking paint according to claim 1, characterized in that: In step e, the road surface temperature is maintained above 5°C.

7. The method for preparing a hot-melt road marking paint according to claim 1, characterized in that: The solid content of the coating in step a is 60-75%.

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