High-toughness epoxy floor coating and preparation method thereof

Abstract

The invention relates to the technical field of epoxy floor coatings, and particularly discloses a high-toughness epoxy floor coating and a preparation method thereof. The high-toughness epoxy floor coating comprises a component A and a component B which are independently packaged and mixed according to the weight ratio of 1: 1 during use, wherein the component A comprises the following components in parts by weight: 100 parts of epoxy resin, 1-10 parts of branched alkyl aniline, 1-10 parts of alkoxy aniline, 10-50 parts of filler, 1-15 parts of reactive diluent and 0-10 parts of additive; the component B comprises the following component in parts by weight: 50 parts of a curing agent. According to the epoxy floor coating provided by the invention, the polyurethane modified epoxy resin is mainly used as a matrix, the branched-chain alkylaniline and the alkoxy aniline are added and compounded for use, and the proper filler, the reactive diluent and the additive are selected, so that the obtained epoxy floor coating has excellent toughness and impact resistance.

Description

Technical Field

[0001] This application relates to the technical field of epoxy floor coatings. More specifically, it relates to a high-toughness epoxy floor coating and a preparation method thereof. Background Art

[0002] Epoxy floor coatings are high-strength, highly wear-resistant, and aesthetic floor coatings. Due to their advantages such as seamless joints, firm texture, anti-corrosion, dust-proof, easy maintenance, and low maintenance costs, they are widely used in mechanical manufacturing plants, hardware factories, automobile factories, aerospace bases, and other places.

[0003] Epoxy resin has the advantages of high bonding strength, low curing shrinkage rate, good stability, and high mechanical strength. The cured product has stable dimensions, a dense three-dimensional cross-linked structure, and strong cohesion. However, due to the relatively large number of aromatic ring structures in the main chain of epoxy resin itself, and the high cross-linking density formed with the curing agent, it usually leads to many undesirable properties, such as brittleness and low fracture toughness. For matrix resins, rigidity and strength are the properties required in most application scenarios. However, in places such as mechanical manufacturing plants, hardware factories, automobile factories, and aerospace bases, large-weight machinery and equipment need to be parked and transported. Therefore, epoxy floors are required to have greater mechanical strength, toughness, and wear resistance to withstand the pressure and impact of large-weight machinery and equipment.

[0004] Currently, the related technologies mainly aim to improve the toughness of epoxy resin through modification, and the modification methods can generally be divided into two categories: physical modification (physically mixing toughening agents into the epoxy resin network) and chemical modification of the epoxy resin structure itself. Some common physical modifiers in epoxy resin systems include liquid elastomers, inorganic particles, and thermoplastics. Due to reasons such as compatibility, they will damage the comprehensive properties of epoxy resin, such as chemical resistance, mechanical properties, insulation properties, etc. Therefore, the current focus of research on toughening modification of epoxy resin has shifted from using toughening agent additives to modifying the molecular structure. Correspondingly, chemical modification also has the defects of complex processes and high costs. Summary of the Invention

[0005] To solve the above technical problems, this application provides a high-toughness epoxy floor coating and a preparation method thereof. It mainly uses polyurethane-modified epoxy resin as the matrix, adds branched-chain alkyl aniline and alkoxy aniline in combination, and selects appropriate fillers, reactive diluents, and additives. The obtained epoxy floor coating has excellent toughness and impact resistance.

[0006] In the first aspect, this application provides a high-toughness epoxy floor coating, adopting the following technical solution:

[0007] A high-toughness epoxy floor coating, comprising component A and component B which are independently packaged and mixed at a weight ratio of 1:1 during use. Component A comprises the following components in parts by weight: 100 parts of epoxy resin, 1 - 10 parts of branched alkyl aniline, 1 - 10 parts of alkoxy aniline, 10 - 50 parts of filler, 1 - 15 parts of reactive diluent, 0 - 10 parts of additive; Component B comprises 50 parts of curing agent in parts by weight.

[0008] Selection of epoxy resin: Bisphenol A epoxy resin has good mechanical properties, adhesion and chemical resistance, and is suitable for various epoxy floor coatings, including self-leveling floors, wear-resistant floors, etc., and can provide excellent durability and protection performance. Glycidylamine epoxy resin has high heat resistance and adhesiveness, and is suitable for floors with high heat resistance requirements, especially in scenarios where high heat resistance and mechanical strength are required. Alicyclic epoxy resin has high compressive and tensile strength and can still maintain good mechanical properties after long-term exposure to high temperature conditions, and is suitable for floor coatings that require high heat resistance and weather resistance, such as outdoor industrial floors. Glycidyl ester epoxy resin has low viscosity and good processability, and the cured product has excellent adhesion and mechanical properties, and can be used to manufacture high-performance epoxy floor coatings, especially in scenarios where high adhesion and chemical resistance are required. Aliphatic polyol glycidyl ether type epoxy resin has low viscosity and long molecular chain, and has good flexibility, and is suitable for floor coatings that require flexibility and impact resistance, such as parking lots, warehouses, etc. Polyurethane-modified epoxy resin combines the high strength of epoxy resin and the high flexibility of polyurethane, and has excellent impact resistance and wear resistance, and is suitable for floors that require high flexibility and impact resistance, such as automobile manufacturing workshops, aerospace industrial plants, etc., and can withstand high-intensity mechanical impacts and frequent wear.

[0009] Considering the flexibility and impact resistance of the epoxy resin, the epoxy resin of this application mainly selects aliphatic polyol glycidyl ether type epoxy resin and / or polyurethane-modified epoxy resin.

[0010] The branched alkyl aniline is an alkyl aniline with a branched alkyl chain. Preferably, the branched alkyl aniline is selected from at least one of 2-(1,3-dimethylbutyl)aniline and 2-isopentylaniline.

[0011] The alkoxy aniline is an alkoxy aniline with an alkoxy chain as the side chain. Preferably, the alkoxy aniline is selected from at least one of 4-undecyloxy aniline, 4-hexyloxy aniline and 4-octadecyloxy aniline.

[0012] Branched alkyl aniline is prone to form more microphase separation, thus capable of significantly improving the strength of epoxy floor coatings. However, for aniline containing branched alkyl groups, the molecular chains are arranged more closely and the steric hindrance is greater. Therefore, compared with linear alkyl aniline, its toughening effect is slightly worse. Thus, in this application, alkoxy aniline is added for compounding. Alkoxy aniline is a compound containing both amino and alkoxy groups. After being added to epoxy resin, the amino group can crosslink and cure with the epoxy group, while the alkoxy group can improve the wettability and adhesion of epoxy resin. In this application, long-chain alkoxy groups are used, which can simultaneously reduce the crosslinking density and have small steric hindrance, capable of achieving a certain toughening effect.

[0013] Preferably, the filler is at least one of nano-silica and nano-alumina.

[0014] Preferably, the active diluent is at least one of benzyl glycidyl ether, 1,4-butanediol diglycidyl ether, cyclohexanediol diglycidyl ether, resorcinol diglycidyl ether, o-tolyl glycidyl ether, cyclopentanediol diglycidyl ether, trimethylolpropane triglycidyl ether, and polypropylene glycol diglycidyl ether.

[0015] The additives include but are not limited to dispersants, wetting agents, defoamers, leveling agents, and pigments. The additives can be added individually or in combination.

[0016] Suitable dispersants can significantly improve the performance of epoxy floor coatings, including gloss, hiding power, storage stability, and construction performance. The specific selection of the dispersant is determined by the specific formulation of the epoxy floor coating and the type of pigment. In this application, one or more of polyurethane type, polyacrylate type, polyamide type, anionic type, and non-ionic type can be specifically used.

[0017] Suitable wetting agents can significantly improve the wetting performance of epoxy floor coatings, improving the painting quality and efficiency. The specific selection of the wetting agent is determined by the construction substrate, coating type, and coating performance. In this application, one or more of carboxylate anionic type, quaternary ammonium salt cationic type, polyoxyethylene ether non-ionic type, and silicone-based wetting agents can be specifically used.

[0018] Suitable defoamers can effectively reduce the bubble problem in epoxy floor coatings, improving the construction quality and coating performance. The specific selection of the defoamer is determined by the formulation compatibility, coating construction method, and specific use. In this application, one or two combinations of silicone defoamers and acrylic polymer defoamers can be specifically used.

[0019] Suitable leveling agents can significantly improve the leveling performance of epoxy floor coatings, enhance the appearance quality and construction effect of the coatings. The specific selection of the dispersant is determined by the construction substrate, coating type and coating performance. In this application, one or a combination of polyacrylic acid, modified polysiloxane-based and modified acrylate-based leveling agents can be specifically adopted.

[0020] Suitable pigments can meet the requirements of epoxy floor coatings in terms of color, abrasion resistance, chemical resistance, etc., and at the same time improve the aesthetics and service life of the floor. In this application, one of phthalocyanine blue, phthalocyanine green, lightfast yellow, titanium dioxide, carbon black, iron oxide red and iron oxide black can be specifically adopted.

[0021] Furthermore, in the B component, at least one of amine curing agents and anhydride curing agents is adopted as the curing agent.

[0022] Among them, for amine curing agents, aliphatic amines such as ethylenediamine, diethylenetriamine, polyethylenepolyamine, etc. can be specifically selected; or aromatic amines such as m-phenylenediamine, m-xylylenediamine, etc.; or amine-modified curing agents such as T31 curing agent, phenolic amino alcohol curing agent, etc. For anhydride curing agents, organic acid anhydrides such as maleic anhydride, phthalic anhydride, etc. can be specifically selected.

[0023] In the second aspect, this application provides a preparation method of a high-toughness epoxy floor coating, adopting the following technical scheme:

[0024] When preparing the high-toughness epoxy floor coating, the A and B components are prepared separately and independently packaged. When in use, they are mixed evenly according to a weight ratio of 1:1. The preparation steps of the A component are as follows: After mixing epoxy resin, branched alkyl aniline, alkoxy aniline, filler, active diluent, and additive, mechanically stir evenly to obtain it; the B component is directly independently packaged to obtain it.

[0025] In summary, this application has the following beneficial effects:

[0026] This application uses polyurethane-modified epoxy resin as the matrix resin, which combines the high strength of epoxy resin and the high flexibility of polyurethane, has excellent impact resistance and abrasion resistance, and is suitable for floors that require high flexibility and impact resistance; by compounding and using branched alkyl aniline and alkoxy aniline, they can participate in the curing of epoxy resin, reduce the crosslinking density, improve the flexibility of the floor, and the adhesion between the floor and the substrate. Specific Embodiments

[0027] The following specific examples illustrate the implementation modes of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0028] In addition, it should be understood that one or more method steps mentioned in the present application do not exclude the existence of other method steps before and after the combined steps or the insertion of other method steps between these explicitly mentioned steps, unless otherwise stated. Moreover, unless otherwise stated, the numbers of each method step are only convenient tools for identifying each method step, rather than restricting the arrangement order of each method step or limiting the scope of implementation of the present application. The change or adjustment of their relative relationships, without substantial change in technical content, should also be regarded as the scope of implementation of the present application.

[0029] If the specific experimental conditions are not specified in the examples, they are usually in accordance with the conventional conditions in the art or the conditions recommended by the reagent company; the materials, reagents, etc. used in the examples, unless otherwise specified, can all be obtained through commercial channels.

[0030] The epoxy resin used in the present application is a polyurethane-modified epoxy resin with the brand name XP3625, purchased from Shanghai Zhongsi Industrial Co., Ltd., with an epoxy equivalent of 205 g / eq and a viscosity of 10 Pa·s at 25°C; the curing agent is an amine curing agent, specifically 4,4'-diaminodiphenyl sulfone (DDS).

[0031] Example

[0032] Example 1

[0033] A high-toughness epoxy floor coating includes component A and component B, which are independently packaged and mixed at a weight ratio of 1:1 during use.

[0034] The preparation steps of component A are as follows: Mix 100 parts of epoxy resin, 1 part of 2-(1,3-dimethylbutyl)aniline, 1 part of 4-undecyloxyaniline, 10 parts of nano-silica, 1 part of 1,4-butanediol diglycidyl ether, 1.5 parts of leveling agent BK-306, 1.5 parts of defoaming agent BYK-054, and 1 part of phthalocyanine blue, stir evenly, filter, and package to obtain.

[0035] The preparation steps of component B are as follows: Filter 50 parts of curing agent DDS and package to obtain.

[0036] Example 2

[0037] A high-toughness epoxy floor coating, comprising component A and component B which are independently packaged and mixed at a weight ratio of 1:1 during use.

[0038] The preparation steps of component A are as follows: Mix 100 parts of epoxy resin, 5 parts of 2-(1,3-dimethylbutyl)aniline, 5 parts of 4-undecyloxyaniline, 30 parts of nano-silica, 10 parts of 1,4-butanediol diglycidyl ether, 2 parts of leveling agent BK-306, 2 parts of defoaming agent BYK-054, and 1 part of phthalocyanine blue, stir evenly and then filter, and package to obtain.

[0039] The preparation steps of component B are as follows: Filter 50 parts of curing agent DDS and then package to obtain.

[0040] Example 3

[0041] A high-toughness epoxy floor coating, comprising component A and component B which are independently packaged and mixed at a weight ratio of 1:1 during use.

[0042] The preparation steps of component A are as follows: Mix 100 parts of epoxy resin, 10 parts of 2-(1,3-dimethylbutyl)aniline, 10 parts of 4-undecyloxyaniline, 50 parts of nano-silica, 15 parts of 1,4-butanediol diglycidyl ether, 2.5 parts of leveling agent BK-306, 2.5 parts of defoaming agent BYK-054, and 1 part of phthalocyanine blue, stir evenly and then filter, and package to obtain.

[0043] The preparation steps of component B are as follows: Filter 50 parts of curing agent DDS and then package to obtain.

[0044] Example 4

[0045] A high-toughness epoxy floor coating, different from Example 1 in that in component A, 2-isopentylaniline is used to replace 2-(1,3-dimethylbutyl)aniline.

[0046] Example 5

[0047] A high-toughness epoxy floor coating, different from Example 1 in that in component A, a mixture composed of 2-(1,3-dimethylbutyl)aniline and 2-isopentylaniline is used to replace 2-(1,3-dimethylbutyl)aniline, and the weight ratio of 2-(1,3-dimethylbutyl)aniline to 2-isopentylaniline is 2:1.

[0048] Example 6

[0049] A high-toughness epoxy floor coating, different from Example 1 in that in component A, 4-hexadecyloxyaniline is used to replace 4-undecyloxyaniline.

[0050] Example 7

[0051] A high-toughness epoxy floor coating, which is different from that of Example 1 in that in component A, 4-octadecyloxyaniline is used to replace 4-undecyloxyaniline.

[0052] Comparative example

[0053] Comparative example 1

[0054] An epoxy floor coating, which is different from that of Example 1 in that in component A, 2-(1,3-dimethylbutyl)aniline is not added, and the addition amount of 4-undecyloxyaniline is increased to 2 parts.

[0055] Comparative example 2

[0056] An epoxy floor coating, which is different from that of Example 1 in that in component A, 4-undecyloxyaniline is not added, and the addition amount of 2-(1,3-dimethylbutyl)aniline is increased to 2 parts.

[0057] Comparative example 3

[0058] An epoxy floor coating, which is different from that of Example 1 in that in component A, 2-(1,3-dimethylbutyl)aniline and 4-undecyloxyaniline are not added.

[0059] Performance detection test

[0060] After the epoxy floor coatings prepared in Examples 1-7 and Comparative Examples 1-3 are painted and cured, their various technical indicators are detected. The technical indicator requirements refer to GB / T 22347-2018 and the agreed requirements. The test results are shown in Table 1 below.

[0061] Table 1 Mechanical properties of epoxy floor coatings

[0062]

[0063]

[0064] It can be seen from the test results in Table 1 that in this application, polyurethane-modified epoxy resin is used as the matrix resin, which has the characteristics of high strength and high flexibility. By adding branched-chain alkyl aniline and alkoxy aniline, the strength and toughness of the epoxy floor are further improved.

[0065] It can be seen from the test results of Example 1 and Comparative Examples 1-3 that branched-chain alkyl aniline can greatly improve the strength of the epoxy floor, while alkoxy aniline can mainly improve the toughness, impact resistance and adhesion of the epoxy floor.

[0066] The above are only the preferred embodiments of the present invention, and do not impose any formal or substantial limitations on the present invention. It should be noted that for those of ordinary skill in the art, without departing from the method of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any equivalent changes, such as slight modifications, decorations, and evolutions made by those skilled in the art who are familiar with the profession without departing from the spirit and scope of the present invention by using the technical content disclosed above, are equivalent embodiments of the present invention; at the same time, any equivalent changes, such as modifications, decorations, and evolutions made to the above embodiments based on the essential technology of the present invention, still fall within the scope of the technical solution of the present invention.

Claims

1. A high-toughness epoxy floor coating, characterized in that: The invention comprises component A and component B which are separately packaged and mixed in a weight ratio of 1:1 when used, wherein component A comprises the following components in parts by weight: 100 parts of epoxy resin, 1-10 parts of branched alkyl aniline, 1-10 parts of alkoxy aniline, 10-50 parts of filler, 1-15 parts of active diluent, and 0-10 parts of additive; and component B comprises the following components in parts by weight: 50 parts of curing agent.

2. The high-toughness epoxy floor coating according to claim 1, characterized in that: The branched alkyl aniline is selected from at least one of 2-(1,3-dimethylbutyl)aniline and 2-isoamylaniline.

3. The high-toughness epoxy floor coating according to claim 1, characterized in that: The alkoxyaniline is selected from at least one of 4-undecyloxyaniline, 4-hexadecyloxyaniline and 4-octadecyloxyaniline.

4. The high-toughness epoxy floor coating according to claim 1, characterized in that: The filler is at least one of nano silicon dioxide and nano aluminum oxide.

5. The high-toughness epoxy floor coating according to claim 1, characterized in that: The active diluent is at least one of benzyl glycidyl ether, 1,4-butanediol diglycidyl ether, cyclohexanediol diglycidyl ether, resorcinol diglycidyl ether, o-cresyl glycidyl ether, cyclopentanediol diglycidyl ether, trimethylol triglycidyl ether and polypropylene glycol diglycidyl ether.

6. The high-toughness epoxy floor coating according to claim 1, characterized in that: The additives include at least one of a dispersant, a wetting agent, a defoamer, a leveling agent, and a pigment.

7. The high-toughness epoxy floor coating according to claim 6, characterized in that: The dispersant is one or more of polyurethane, polyacrylate, polyamide, anionic and nonionic.

8. The high-toughness epoxy floor coating according to claim 6, characterized in that: The wetting agent is one or more of carboxylate anion type, quaternary ammonium salt cation type, polyoxyethylene ether nonionic type, and silicone-based wetting agent; the defoaming agent is one or a combination of silicone defoaming agent and acrylic polymer defoaming agent.

9. The high-toughness epoxy floor coating according to claim 6, characterized in that: The leveling agent is one or more combinations of polyacrylic acid, modified polysiloxane and modified acrylate leveling agents; the pigment is one of phthalocyanine blue, phthalocyanine green, fast yellow, titanium dioxide, carbon black, iron oxide red and iron oxide black.

10. A method for preparing the high-toughness epoxy floor coating according to any one of claims 1 to 9, characterized in that: When preparing the high-toughness epoxy floor coating, components A and B are prepared separately and packaged independently, and are evenly mixed in a weight ratio of 1:1 when used. The preparation steps of component A are: epoxy resin, branched alkyl aniline, alkoxy aniline, filler, active diluent, and additives are mixed, and mechanically stirred to obtain; the component B is directly packaged independently.

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