Weather-resistant and wear-resistant epoxy mortar coating for identification and preparation method of weather-resistant and wear-resistant epoxy mortar coating

Abstract

The invention provides a weather-resistant and wear-resistant epoxy mortar coating for identification. The raw materials of the epoxy mortar coating at least comprise a component A and a component B, the component A comprises modified epoxy resin, aggregate and a reflective material; the component B comprises a curing agent and an auxiliary agent; wherein the modified epoxy resin has a structure shown in the specification, n is selected from 2-3, an R group is selected from one of-OCH3,-OCH2CH3 and-CH (CH3) 2, and * represents a chemical bond connection site; the epoxy resin is subjected to graft modification, the mechanical property of the epoxy resin is remarkably improved due to weakening of rigidity of a biphenyl structure and group space resistance, the wear resistance and weather resistance of the obtained coating can be further improved, and the modified epoxy mortar is grafted with a silane coupling agent, so that the coating has longer and more tentacles, and the service life of the coating is prolonged. Acting force can be formed on the surfaces of aggregate and glass beads, so that the overall coagulability of the coating is enhanced, the problem of particle falling is solved, and the repair frequency is reduced. # imgabs0 #

Description

Technical Field

[0001] The invention relates to an epoxy mortar coating, in particular to a weather-resistant and wear-resistant epoxy mortar coating for marking and a preparation method thereof. Background Art

[0002] With the rapid development of road traffic, road coatings play an important role in ensuring driving safety and improving traffic management efficiency. Among them, reflective and anti-skid coatings have become a widely used type of functional coatings because they can provide clear visual guidance at night and significantly improve driving safety. However, existing road reflective and anti-skid coatings face many problems in practical applications, especially the problem of easy shedding of reflective particles and anti-skid particles, which directly affects the functionality and service life of the coatings.

[0003] At present, most reflective and anti-skid coatings use glass beads or ceramic particles as reflective materials, and add hard particles such as sand and aluminum oxide to improve the anti-skid performance. These particles are usually fixed in the coating by physical embedding or surface attachment. Under the combined effects of long-term vehicle rolling, environmental climate change and rain erosion, the particles are easy to fall off from the coating. This not only greatly reduces the reflective effect and anti-skid performance of the coating, but also causes uneven optical or mechanical properties of the road surface, posing a potential threat to traffic safety. In addition, after the particles fall off and scatter on the road surface, they may cause additional sliding risks to other vehicles, especially motorcycles and bicycles.

[0004] In order to extend the service life and functional stability of the coating, it is usually necessary to rely on a high-performance resin matrix to fix the particles. However, existing resin systems often have a balance problem between adhesion, weather resistance and toughness. Although some traditional epoxy, polyurethane or acrylic-based coatings can provide good initial adhesion, they may age, crack or peel under the long-term action of high temperature, ultraviolet rays or chemicals, further accelerating the shedding of particles. This comprehensive problem is particularly prominent on roads with heavy traffic and harsh environments, and it is urgent to develop higher-performance reflective and anti-skid coatings to solve it.

[0005] In summary, current road reflective and anti-skid coatings face technical bottlenecks such as easy shedding of reflective and anti-skid particles, short service life, and poor reflective effect. This puts higher demands on the research and development of new coating materials, which requires comprehensive consideration of the selection of particle materials, modification of base resins, and optimization of coating processes to achieve the coordination and unification of durability, reflectivity, and anti-skid performance. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a weather-resistant and wear-resistant epoxy mortar coating for marking and a preparation method thereof.

[0007] In a first aspect, the present invention provides a weather-resistant and wear-resistant epoxy mortar coating for marking, wherein the raw materials of the epoxy mortar coating at least include component A and component B; the component A includes a modified epoxy resin, an aggregate and a reflective material; the component B includes a curing agent and an auxiliary agent;

[0008] Wherein, the modified epoxy resin has a structure as shown in Formula 1 below:

[0009]

[0010] Wherein, n is selected from 2-3, the R group is selected from one of -OCH3, -OCH2CH3, -CH(CH3)2, and * represents the chemical bond connection site.

[0011] In some embodiments, the method for preparing the modified epoxy resin comprises the following steps:

[0012] S1: Dissolving ferulic acid and a silane coupling agent in a solvent respectively to obtain a ferulic acid reaction solution and a silane coupling agent reaction solution; mixing the two, adding a catalyst and heating to react, to obtain an intermediate 1;

[0013] S2: Add intermediate 1 and solvent into a reaction flask to completely dissolve intermediate 1, add 1,3-dicyclohexylcarbodiimide into the reaction system, stir and react at room temperature for 2-6 hours, after the reaction is completed, wash the reactant with solvent, and remove the solvent by rotary evaporation to obtain intermediate 2;

[0014] S3: After mixing the intermediate 2, the epoxy resin and the catalyst, reacting them under heating conditions for 1-3 hours to obtain a modified epoxy resin.

[0015] In some embodiments, the silane coupling agent is selected from one or more combinations of 3-propylenetrimethoxysilane, 3-propylenetriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, allyltriethoxysilane, and the like.

[0016] In some embodiments, the molar ratio of ferulic acid to the silane coupling agent is 1:1-1.5.

[0017] In some embodiments, the solvent in S2 is not limited to any type, for example, it can be selected from one or more combinations of dichloromethane, ethanol, methanol, and anhydrous acetonitrile.

[0018] In some embodiments, the heating reaction in S2 is carried out under the heating condition of 60-80°C and the reaction time of 2-6h. The reaction solution is heated to 60-80°C and maintained for 2-6 hours to ensure that the double bonds of ferulic acid and the silane coupling agent react fully.

[0019] In some embodiments, the molar ratio of the intermediate 1 to 1,3-dicyclohexylcarbodiimide is 1:1.1-1.5. The role of 1,3-dicyclohexylcarbodiimide is to help the carboxyl group react by forming an activated ester intermediate.

[0020] In some embodiments, the epoxy resin is selected from one or more combinations of E51 epoxy resin, E44 epoxy resin, E12 epoxy resin, and E100 epoxy resin. The epoxy resin with a suitable molecular weight or structure can be selected according to the actual application.

[0021] In some embodiments, the ratio of the molar amount of the alcoholic hydroxyl group of the intermediate 2 to the molar amount of the epoxy group of the epoxy resin is 1-1.2:1.

[0022] In some embodiments, the aggregate is selected from one or more of the group consisting of alumina, talc, mica powder, heavy calcium powder, quartz sand and aluminum silicate ceramic powder; preferably, the aggregate is selected from one or more of the group consisting of alumina, quartz sand and aluminum silicate ceramic powder.

[0023] For example, the quartz sand can be black, blue, red, white or other colors, providing a certain aesthetics for the epoxy mortar.

[0024] In some embodiments, the reflective material is glass beads with a specification of 100-500 mesh.

[0025] In some embodiments, the curing agent is selected from one or more combinations of amine curing agents, anhydride curing agents, and polyamine curing agents; preferably, the curing agent is an amine curing agent, for example, it can be one or more combinations of triethylenetetramine, diethylenetriamine, isophoronediamine, 4,4'-diaminodiphenylmethane, and diaminodiphenyl sulfone.

[0026] In some embodiments, the auxiliary agent can be selectively added according to actual needs, for example, one or more combinations of toughening agents, plasticizers, thickeners, anti-ultraviolet agents, antistatic agents, moisture-proof agents or preservatives can be added. The present invention does not specifically limit the types of auxiliary agents.

[0027] In some embodiments, the raw materials of the epoxy mortar coating include at least component A and component B, measured by weight; component A includes 30-50 parts of modified epoxy resin, 15-30 parts of aggregate and 10-30 parts of reflective material; component B includes 5-15 parts of curing agent and 0.1-10 parts of additives.

[0028] In a second aspect, the present invention provides a method for preparing the above-mentioned weather-resistant and wear-resistant epoxy mortar coating for marking, which specifically comprises the following steps:

[0029] Preparation of component A: add modified epoxy resin to a container under low-speed stirring at 300-700 rpm, and disperse at low speed at 300-700 rpm for 5-10 minutes; then add aggregate and disperse at high speed at 1000-1500 rpm; then add reflective material and disperse at low speed at 300-700 rpm for 10-15 minutes to obtain component A;

[0030] Preparation of component B: Add the curing agent and the auxiliary agent into the container under low-speed stirring at 50-100 rpm, and disperse at 500-700 rpm for 5-10 minutes to obtain component B.

[0031] Beneficial Effects

[0032] 1. The epoxy resin is grafted and modified. Due to the rigidity of the biphenyl structure and the weakening of the group space resistance, the mechanical properties of the epoxy resin are significantly improved, and the wear resistance and weather resistance of the obtained coating can be further improved, thereby increasing the service life of the marking coating.

[0033] 2. The modified epoxy mortar is grafted with silane coupling agent, which has longer and more "tentacles", which can form force with the surface of aggregate and glass beads, enhance the overall coagulation of the coating, reduce the problem of particle shedding, and reduce the number of repairs. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with examples. It should be noted that the specific implementation methods described herein are only for illustrating and explaining the present invention and are not intended to limit the present invention.

[0035] The mica powder used in the embodiment of the present invention has a specification of 20 mesh; the glass microbeads used are purchased from Gongyi Chenyi Refractory Abrasive Co., Ltd., item number kxwz00019.

[0036] Preparation of modified epoxy resin 1

[0037] S1: Dissolve 1 mol of ferulic acid and 1.5 mol of vinyltrimethoxysilane in 50 ml of dichloromethane to obtain a ferulic acid reaction solution and a silane coupling agent reaction solution; mix the two, add 0.02 mol of BPO, heat to 60°C and react for 4 hours to obtain intermediate 1;

[0038] S2: 1 mol of the intermediate 1 obtained above and 50 ml of dichloromethane were added to a reaction flask to completely dissolve the intermediate 1, and 1.5 mol of 1,3-dicyclohexylcarbodiimide was added to the reaction system. The mixture was stirred at room temperature for 4 h. After the reaction was completed, the reactant was washed with dichloromethane and the dichloromethane was removed by rotary evaporation to obtain intermediate 2;

[0039] S3: 1.5 mol of intermediate 2 and 2 g of E51 epoxy resin were mixed and added into a reactor, 0.01 mol of triethylamine was added and mixed, and the mixture was slowly heated at 50° C. to react for 3 h to obtain modified epoxy resin 1.

[0040] Preparation of modified epoxy resin 2

[0041] The modified epoxy resin 2 is basically the same as the modified epoxy resin 1, except that 3-propylenetrimethoxysilane is used in S1 to replace vinyltrimethoxysilane, and E44 epoxy resin is used in S3 to replace E51 epoxy resin. The added amount is 2.3g, and the modified epoxy resin 2 is prepared.

[0042] Preparation of modified epoxy resin 3

[0043] The modified epoxy resin 2 is basically the same as the modified epoxy resin 1, except that allyl triethoxysilane is used in S1 to replace vinyl trimethoxysilane, and E12 type epoxy resin is used in S3 to replace E51 type epoxy resin, and the added amount is 8.3g, to prepare the modified epoxy resin 2.

[0044] Preparation of modified epoxy resin 4

[0045] S1: 1 mol of ferulic acid and 50 ml of dichloromethane were added to a reaction flask to completely dissolve the ferulic acid, 1.5 mol of 1,3-dicyclohexylcarbodiimide was added to the reaction system, and the mixture was stirred at room temperature for 4 h. After the reaction was completed, the reactant was washed with dichloromethane, and the dichloromethane was removed by rotary evaporation to obtain an intermediate;

[0046] S2: 1.5 mol of the intermediate and 2 g of E51 epoxy resin were mixed and added into a reactor, 0.01 mol of triethylamine was added and mixed, and the mixture was slowly heated at 50° C. for 3 h to obtain modified epoxy resin 4.

[0047] Example

[0048] Weigh according to the recipe in the table below.

[0049] Preparation of component A: add modified epoxy resin to a container under low-speed stirring at 300 rpm, and disperse at low speed at 700 rpm for 10 minutes; then add aggregate and disperse at high speed at 1000 rpm for 10 minutes; then add reflective material and disperse at low speed at 500 rpm for 10 minutes to obtain component A;

[0050] Preparation of component B: Add the curing agent and the auxiliary agent into the container under low-speed stirring at 100 rpm, and disperse at 500 rpm for 10 minutes to obtain component B.

[0051] Table 1 Raw materials and added parts of each embodiment (weight parts)

[0052]

[0053]

[0054] Table 2 Raw materials and added parts of each comparative example (parts by weight)

[0055]

[0056] The laid epoxy mortars of the embodiments and comparative examples were tested according to the following method:

[0057] 1. Compressive strength: Tested in accordance with GB / T17671-1999. The higher the value, the better the compressive resistance.

[0058] 2. Wear resistance: Tested in accordance with GB / T22374-2008, the wear loss is less than 0.030g, which is qualified.

[0059] 3. Adhesion: The test is carried out according to standard GB / T9286-1998. The test results are graded according to integers from 0 to 5. The increasing value indicates the poorer adhesion. Grade 0 indicates intact, Grade 4 indicates that the layer is peeling off in large pieces along the cutting edge, and / or some squares are partially or completely peeling off, and the affected cross-cut area is significantly greater than 35%, but not significantly greater than 65%. Grade 5 indicates that the degree of peeling exceeds Grade 4.

[0060] 4. Anti-slip coefficient: After the mortar has passed the artificial aging test for 400 hours according to GB / T22374-2008, the anti-slip coefficient after aging is tested according to GB / T 16906-2009. The dry anti-slip coefficient of 0.6-0.9 is excellent, and the wet anti-slip coefficient of 0.4-0.8 is excellent.

[0061] Table 3 Test results

[0062]

[0063]

[0064] It can be seen from the experimental data in the table that the epoxy mortar material prepared in Example 3 has the strongest advantages. The material has the characteristics of high compression resistance, high wear resistance, strong adhesion and good anti-skid performance, meeting the requirements of road paving materials; Examples 4 and 5 change the specific structure of the silane coupling agent and the epoxy resin, so that the structure chain of the synthesized modified epoxy resin is slightly changed, and the cross-linking reaction with the curing agent is weakened. The obtained epoxy mortar is not as good as the product of Example 3 in all aspects of performance. Comparative Example 1 has increased brittleness due to the addition of too much modified epoxy resin. Although the anti-skid coefficient and compressive strength do not change much, the wear resistance and adhesion are reduced, and it is easy to crack and fall off.

[0065] Since Comparative Example 2 did not use silane coupling agent to modify the epoxy resin, the adhesion and fixation degree of the epoxy mortar to the aggregate and reflective material were reduced, resulting in a significant decrease in the wear resistance and anti-slip coefficient of the epoxy mortar; since Comparative Example 3 did not use the modified epoxy resin provided by the present invention, the performance was not as good as the epoxy mortar provided in the embodiment.

[0066] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A weather-resistant and wear-resistant epoxy mortar coating for marking, characterized in that: The raw materials of the epoxy mortar coating at least include component A and component B; the component A includes modified epoxy resin, aggregate and reflective material; the component B includes a curing agent and an auxiliary agent; Wherein, the modified epoxy resin has a structure as shown in Formula 1 below: Wherein, n is selected from 2-3, the R group is selected from one of -OCH3, -OCH2CH3, -CH(CH3)2, and * represents the chemical bond connection site.

2. The epoxy mortar coating according to claim 1, characterized in that: The preparation method of the modified epoxy resin comprises the following steps: S1: Dissolving ferulic acid and a silane coupling agent in a solvent respectively to obtain a ferulic acid reaction solution and a silane coupling agent reaction solution; mixing the two, adding a catalyst and heating to react, to obtain an intermediate 1; S2: Add intermediate 1 and solvent into a reaction flask to completely dissolve intermediate 1, add 1,3-dicyclohexylcarbodiimide into the reaction system, stir and react at room temperature for 2-6 hours, after the reaction is completed, wash the reactant with solvent, and remove the solvent by rotary evaporation to obtain intermediate 2; S3: After mixing the intermediate 2, the epoxy resin and the catalyst, reacting them under heating conditions for 1-3 hours to obtain a modified epoxy resin.

3. The epoxy mortar coating according to claim 2, characterized in that: The silane coupling agent is selected from one or more combinations of 3-propylene trimethoxy silane, 3-propylene triethoxy silane, vinyl trimethoxy silane, vinyl triethoxy silane, allyl triethoxy silane and the like.

4. The epoxy mortar coating according to claim 2, characterized in that: The molar ratio of the ferulic acid to the silane coupling agent is 1:1-1.

5.

5. The epoxy mortar coating according to claim 2, characterized in that: The molar ratio of the intermediate 1 to 1,3-dicyclohexylcarbodiimide is 1:1.1-1.

5.

6. The epoxy mortar coating according to claim 2, characterized in that: The epoxy resin is selected from one or more combinations of E51 epoxy resin, E44 epoxy resin, E12 epoxy resin and E100 epoxy resin.

7. The epoxy mortar coating according to claim 2, characterized in that: The ratio of the molar amount of the alcoholic hydroxyl group of the intermediate 2 to the molar amount of the epoxy group of the epoxy resin is 1-1.2:

1.

8. The epoxy mortar coating according to claim 2, characterized in that: The aggregate is selected from one or more of the group consisting of alumina, talc, mica powder, heavy calcium powder, quartz sand and aluminum silicate ceramic powder; the reflective material is glass beads; the curing agent is selected from one or more combinations of amine curing agents, acid anhydride curing agents and polyamine curing agents.

9. The epoxy mortar coating according to claim 1, characterized in that: The raw materials of the epoxy mortar coating include at least component A and component B; the component A includes 30-50 parts of modified epoxy resin, 15-30 parts of aggregate and 10-30 parts of reflective material; the component B includes 5-15 parts of curing agent and 0.1-10 parts of auxiliary agent.

10. The method for preparing the epoxy mortar coating according to any one of claims 1 to 9, comprising the following steps: Preparation of component A: add modified epoxy resin to a container under low-speed stirring at 300-700 rpm, and disperse at low speed at 300-700 rpm for 5-10 minutes; then add aggregate and disperse at high speed at 1000-1500 rpm; then add reflective material and disperse at low speed at 300-700 rpm for 10-15 minutes to obtain component A; Preparation of component B: Add the curing agent and the auxiliary agent into the container under low-speed stirring at 50-100 rpm, and disperse at 500-700 rpm for 5-10 minutes to obtain component B.

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