An epoxy-based wood finish and method of producing the same

Abstract

The present application relates to the field of finish technology, disclose a kind of wood finish based on epoxy resin and its production method, the wood finish is with modified mica powder strengthening component and other auxiliary materials by mixing to form with epoxy resin as film-forming material, wherein modified mica powder strengthening component is prepared by grafting macromolecular modifier on the surface of mica powder, the existence of macromolecular modifier is equivalent to form organic transition layer between mica powder and epoxy resin, can greatly improve the interfacial bonding performance between mica powder and epoxy resin, promote mica powder can be uniformly dispersed in epoxy resin, can efficiently exert the advantage of itself inorganic reinforcing agent, produce stress dispersion and transfer effect, improve the impact resistance of paint film.In addition, macromolecular modifier contains siloxane and benzene fluoride alternative structure, this structure has very strong hydrophobic property, after mutual entanglement with epoxy resin molecular chain, can make paint film form super-hydrophobic surface, impart paint film self-cleaning property.

Description

Technical Field

[0001] This invention relates to the field of topcoat technology, specifically to an epoxy resin-based wood topcoat and its production method. Background Technology

[0002] Wood coatings are essential materials for surface coating of wood products. They not only beautify the appearance of wood products but also enhance their durability and protective properties. Among various wood coatings, epoxy resin coatings are favored due to their unique properties, primarily because epoxy resin has excellent adhesion, good corrosion resistance, and moisture resistance. Although epoxy resin films are tough and wear-resistant, their inherent structure makes them brittle after complete curing, resulting in low impact strength. Under significant external impact, the film may crack or break, failing to provide effective protection for the wood. Furthermore, the film inevitably becomes stained with oil and dirt during use, greatly affecting its appearance. Epoxy resin coatings lack self-cleaning properties, making cleaning difficult. Therefore, functional improvements to epoxy resin coatings are crucial for their further application.

[0003] The invention patent with publication number CN113292904B discloses a two-component wear-resistant and toughening modified waterborne epoxy resin floor paint and its preparation method. By preparing end-capped polyesteramide modified nano MoO3@MoS2 as a curing agent for epoxy resin, the comprehensive properties such as toughness of epoxy resin floor paint are improved. Therefore, by improving the components of epoxy resin topcoat, the epoxy resin film can be strengthened and toughened, and special effects can be given to the film. Summary of the Invention

[0004] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide an epoxy resin-based wood coating and its production method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for producing an epoxy resin-based wood coating, wherein the wood coating is made from raw materials comprising the following parts by weight:

[0007]

[0008] The method for producing the wood coating includes the following steps:

[0009] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0010] The second step involves adding epoxy resin, modified mica powder reinforcing components, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 1000-2000 r / min for 1-2 hours. Then, the stirring rate is adjusted to 200-300 r / min, and defoamer is added to the mixing tank. After stirring for 20-30 minutes, the mixture is allowed to stand for 1-2 hours to form a paint precursor.

[0011] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 100-200 r / min for 10-30 minutes to obtain the wood surface paint.

[0012] As a further aspect of the present invention, the epoxy resin is either bisphenol A type epoxy resin or bisphenol F type epoxy resin.

[0013] As a further aspect of the present invention, the specific preparation method of the modified mica powder reinforcing component includes the following steps:

[0014] Step A: Disperse mica powder ultrasonically in an ethanol aqueous solution with a volume fraction of 60-70%. Then add silane coupling agent to the resulting dispersion. After the addition is complete, raise the temperature to 70-80℃ and stir for 6-9 hours. Separate the solid material to obtain functionalized mica powder.

[0015] Step B: Add mica powder to 1,4-dioxane and ultrasonically disperse for 20-40 minutes. Then add polymer modifier. After the addition is complete, heat to 60-70℃, keep warm and stir for 4-8 hours, and then centrifuge to separate the solid material to obtain the modified mica powder reinforced component.

[0016] As a further aspect of the present invention, in step A, the silane coupling agent is at least one of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, or N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.

[0017] As a further aspect of the present invention, the specific preparation method of the polymeric modifier in step B is as follows:

[0018] Step S1: Add glycerol diglycidyl ether, 3,5-bis(trifluoromethyl)phenyl isocyanate and toluene to the reaction vessel, start stirring, and after a homogeneous reaction solution is formed, add the metal catalyst to the reaction vessel. After the addition is complete, start heating and raise the temperature to 70-80℃. Keep the reaction at this temperature for 8-12 hours, evaporate and remove the solvent, collect the product, and purify it to obtain the bridging agent.

[0019] Step S2: Add 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol to N,N-dimethylformamide, purge with nitrogen for protection, and mechanically stir until homogeneous. Then add the bridging agent and phase transfer catalyst. After the addition is complete, control the heating rate to 3-4℃ / min and raise the temperature to 80-90℃. Continue stirring and polymerizing for 12-18 hours, then cool down and discharge the material to obtain the polymer modifier.

[0020] As a further aspect of the present invention, in step S1, the molar ratio of the glycerol diglycidyl ether 3,5-bis(trifluoromethyl)phenyl isocyanate is 1:1.

[0021] As a further aspect of the present invention, in step S1, the metal catalyst is dibutyltin dilaurate or stannous octoate.

[0022] As a further aspect of the present invention, in step S2, the molar ratio of 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol and the bridging agent is 1:1-1.2.

[0023] As a further aspect of the present invention, in step S2, the phase transfer catalyst is any one of tetrabutylammonium bromide, tetramethylammonium bromide, or N,N-dimethylbenzylamine.

[0024] In the above technical solution, an aminosilane coupling agent is first used to modify the surface of mica powder to achieve amino functionalization modification of mica powder and obtain functionalized mica powder.

[0025] Using glycerol diglycidyl ether 3,5-bis(trifluoromethyl)phenyl isocyanate as a reactant, under the action of a metal catalyst, the active hydroxyl groups in their structures can undergo an amino esterification reaction with highly active isocyanate groups to obtain an intermediate containing two equivalent epoxy groups, namely a bridging agent. Then, under the action of a phase transfer catalyst, the epoxy groups in the bridging agent structure can undergo continuous ring-opening addition with the active hydroxyl groups in the 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol structure. By controlling the molar ratio of the two, a polymeric modifier with epoxy groups at the end of the structure and a block alternating structure can be obtained.

[0026] Under high temperature conditions, the active amino groups of functionalized mica powder can undergo ring-opening reactions with the epoxy substituents of polymeric modifiers, thereby modifying the surface of mica powder with polymeric modifiers to obtain modified mica powder reinforcing components.

[0027] An epoxy resin-based wood coating is prepared using the above-described production method.

[0028] The beneficial effects of this invention are:

[0029] This invention prepares a modified mica powder reinforcing component by grafting a polymeric modifier onto the surface of mica powder. Firstly, the presence of the polymeric modifier effectively forms an organic transition layer between the mica powder and epoxy resin. Furthermore, the hydroxyl groups generated by the ring-opening reaction in the polymeric diluent structure can participate in the curing process of the epoxy resin, thus greatly improving the interfacial bonding performance between the mica powder and epoxy resin. This promotes the uniform dispersion of mica powder within the epoxy resin. After curing, the mica powder is uniformly present in the paint film, leveraging its advantages as an inorganic reinforcing agent to produce stress dispersion and transfer effects, thereby improving the impact resistance of the paint film. In addition, the polymeric modifier contains alternating silicon-oxygen and benzene-fluorine structures. This structure has extremely strong hydrophobic properties. After intertwining with the epoxy resin molecular chains, it can create a superhydrophobic surface on the paint film, endowing it with self-cleaning properties.

[0030] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an infrared analysis test image of a polymeric modifier. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Preparation Example 1

[0035] Preparation of modified mica powder reinforcing components:

[0036] Step A: Disperse 2.5g of mica powder ultrasonically in a 70% (v / v) ethanol aqueous solution. Then add 4g of 3-aminopropyltriethoxysilane to the resulting dispersion. After the addition is complete, raise the temperature to 75°C and stir for 8 hours. Separate the solid material to obtain functionalized mica powder.

[0037] Step B: Add 1.8g of mica powder to 1,4-dioxane and ultrasonically disperse for 30 minutes. Then add 5g of polymer modifier. After the addition is complete, heat to 65℃, keep warm and stir for 6 hours, and then centrifuge to separate the solid material to obtain the modified mica powder reinforced component.

[0038] The preparation method of the polymer modifier is as follows:

[0039] Step S1: Add 0.4g of glyceryl diglycidyl ether, 0.5g of 3,5-bis(trifluoromethyl)phenyl isocyanate and toluene to the reaction vessel, start stirring, and after forming a homogeneous reaction solution, add 0.01g of dibutyltin dilaurate to the reaction vessel. After the addition is complete, start heating and raise the temperature to 75℃. After holding the reaction at this temperature for 9 hours, evaporate the solvent to remove it, collect the product, and purify it to obtain the bridging agent.

[0040] Step S2: Add 0.2g of 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol to N,N-dimethylformamide, purge with nitrogen for protection, and mechanically stir until homogeneous. Then add 0.4g of bridging agent and 0.01g of tetrabutylammonium bromide. After the addition is complete, control the heating rate to 3℃ / min and raise the temperature to 90℃. Continue stirring and polymerize for 16h, then cool down and discharge the material to obtain the polymer modifier.

[0041] Figure 1 This is the infrared analysis result of the polymer modifier, where 3389 cm⁻¹... -1 The characteristic absorption peak appearing at 3000 cm⁻¹ is the characteristic absorption peak of the hydroxyl group produced by the ring-opening reaction. -1 ~3100cm -1 The characteristic absorption peak appearing at 1733 cm⁻¹ is a characteristic absorption peak of hydrocarbons in the benzene ring skeleton. -1 The characteristic absorption peak appearing at 1391 cm⁻¹ is the characteristic absorption peak of carbon and oxygen in the amine ester group. -1 The characteristic absorption peak appearing at 1000 cm⁻¹ is a characteristic absorption peak of carbon and fluorine. -1 ~1100cm -1 The characteristic absorption peaks appearing at this point are overlapping characteristic absorption peaks of silicon-oxygen and ether bonds.

[0042] Example 1

[0043] An epoxy resin-based wood coating is made from raw materials comprising the following parts by weight:

[0044]

[0045] The method for producing the wood coating includes the following steps:

[0046] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0047] The second step involves adding epoxy resin, modified mica powder reinforcing components, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 1000 r / min for 2 hours. Then, the stirring rate is adjusted to 200 r / min, and defoamer is added to the mixing tank. After stirring for 30 minutes, the mixture is allowed to stand for 1 hour to form a paint precursor.

[0048] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 100 r / min for 30 minutes to obtain the wood surface paint.

[0049] The epoxy resin used is E51 type epoxy resin; the modified mica powder reinforcing component is the modified mica powder reinforcing component prepared in Preparation Example 1; the leveling agent is BYK-310; the defoamer is BYK-085; the acid anhydride curing agent is tetrahydrophthalic anhydride; and the organic solvent is xylene, and the following are all the same.

[0050] Example 2

[0051] An epoxy resin-based wood coating is made from raw materials comprising the following parts by weight:

[0052]

[0053] The method for producing the wood coating includes the following steps:

[0054] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0055] The second step involves adding epoxy resin, modified mica powder reinforcing components, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 1500 r / min for 1 hour. Then, the stirring rate is adjusted to 200 r / min, and defoamer is added to the mixing tank. After stirring for 25 minutes, the mixture is allowed to stand for 1 hour to form a paint precursor.

[0056] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 150 r / min for 20 minutes to obtain the wood surface paint.

[0057] Example 3

[0058] An epoxy resin-based wood coating is made from raw materials comprising the following parts by weight:

[0059]

[0060] The method for producing the wood coating includes the following steps:

[0061] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0062] The second step involves adding epoxy resin, modified mica powder reinforcing components, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 2000 r / min for 1 hour. Then, the stirring rate is adjusted to 300 r / min, and defoamer is added to the mixing tank. After stirring for 20 minutes, the mixture is allowed to stand for 2 hours to form a paint precursor.

[0063] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 200 r / min for 10 minutes to obtain the wood surface paint.

[0064] Comparative Example 1

[0065] An epoxy resin-based wood coating is made from raw materials comprising the following parts by weight:

[0066]

[0067]

[0068] The method for producing the wood coating includes the following steps:

[0069] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0070] The second step involves adding epoxy resin, mica powder, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 1500 r / min for 1 hour. Then, the stirring rate is adjusted to 200 r / min, and defoamer is added to the mixing tank. After stirring for 25 minutes, the mixture is allowed to stand for 1 hour to form a paint precursor.

[0071] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 150 r / min for 20 minutes to obtain the wood surface paint.

[0072] Comparative Example 2

[0073] An epoxy resin-based wood coating is made from raw materials comprising the following parts by weight:

[0074]

[0075] The method for producing the wood coating includes the following steps:

[0076] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0077] The second step involves adding epoxy resin, polymer modifier, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 1500 r / min for 1 hour. Then, the stirring rate is adjusted to 200 r / min, and defoamer is added to the mixing tank. After stirring for 25 minutes, the mixture is allowed to stand for 1 hour to form a paint precursor.

[0078] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 150 r / min for 20 minutes to obtain the wood surface paint.

[0079] The preparation method of the polymeric modifier is shown in Preparation Example 1.

[0080] Comparative Example 3

[0081] An epoxy resin-based wood coating is made from raw materials comprising the following parts by weight:

[0082]

[0083] The method for producing the wood coating includes the following steps:

[0084] Step 1: Weigh out each ingredient according to the specified weight proportions and set aside.

[0085] The second step is to add epoxy resin, dispersant, leveling agent and organic solvent into the mixing tank and stir continuously at a stirring rate of 1500 r / min for 1 hour. Then, adjust the stirring rate to 200 r / min and add defoamer into the mixing tank. After stirring for 25 minutes, let it stand for 1 hour to form the paint precursor.

[0086] The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 150 r / min for 20 minutes to obtain the wood surface paint.

[0087] Test case

[0088] The wood coatings from the examples and comparative examples were made into coating films and subjected to the following performance tests;

[0089] The test results are recorded in Table 1:

[0090] Impact strength / kg·cm Water contact angle / ° Example 1 51.8 153 Example 2 52.2 154 Example 3 52.1 153 Comparative Example 1 46.9 121 Comparative Example 2 41.0 150 Comparative Example 3 40.6 120

[0091] Note: The impact performance of the paint film was tested in accordance with the standard GB / T 1732-2020; the water contact angle of the paint film was tested using a TC-A3 automatic contact angle measuring instrument.

[0092] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for producing an epoxy resin-based wood coating, characterized in that, The wood finish is made from raw materials comprising the following parts by weight: 45-55 parts epoxy resin; 1-2.5 parts of modified mica powder reinforcing component; Leveling agent 0.5-1 part; 0.5-1.5 parts of defoamer; 25-35 parts of acid anhydride curing agent; 40-50 parts organic solvent; The method for producing the wood coating includes the following steps: Step 1: Weigh out each ingredient according to the specified weight proportions and set aside. The second step involves adding epoxy resin, modified mica powder reinforcing components, dispersant, leveling agent, and organic solvent into a mixing tank and continuously stirring at a stirring rate of 1000-2000 r / min for 1-2 hours. Then, the stirring rate is adjusted to 200-300 r / min, and defoamer is added to the mixing tank. After stirring for 20-30 minutes, the mixture is allowed to stand for 1-2 hours to form a paint precursor. The third step is to add the curing agent to the paint precursor and stir and mix at a stirring rate of 100-200 r / min for 10-30 minutes to obtain the wood surface paint. The specific preparation method of the modified mica powder reinforcing component includes the following steps: Step A: Surface modification of mica powder using a silane coupling agent to obtain functionalized mica powder; Step B: Further modify the functionalized mica powder using a polymer modifier to obtain the modified mica powder reinforcing component; The specific preparation method of the polymeric modifier is as follows: Step S1: Add glycerol diglycidyl ether, 3,5-bis(trifluoromethyl)phenyl isocyanate and toluene to the reaction vessel, start stirring, and after a homogeneous reaction solution is formed, add the metal catalyst to the reaction vessel. After the addition is complete, start heating and raise the temperature to 70-80℃. Keep the reaction at this temperature for 8-12 hours, evaporate and remove the solvent, collect the product, and purify it to obtain the bridging agent. Step S2: Add 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol to N,N-dimethylformamide, purge with nitrogen for protection, and mechanically stir until homogeneous. Then add the bridging agent and phase transfer catalyst. After the addition is complete, control the heating rate to 3-4℃ / min and raise the temperature to 80-90℃. Continue stirring and polymerize for 12-18 hours, then cool down and discharge the material to obtain the polymer modifier. The molar ratio of the glycerol diglycidyl ether and 3,5-bis(trifluoromethyl)phenyl isocyanate is 1:1; The molar ratio of 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol and the bridging agent is 1:1-1.

2.

2. The method for producing an epoxy resin-based wood coating according to claim 1, characterized in that, The epoxy resin is either bisphenol A type epoxy resin or bisphenol F type epoxy resin.

3. The method for producing an epoxy resin-based wood coating according to claim 1, characterized in that, In step A, the silane coupling agent is at least one of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, or N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.

4. The method for producing an epoxy resin-based wood coating according to claim 1, characterized in that, In step S1, the metal catalyst is dibutyltin dilaurate or stannous octoate.

5. The method for producing an epoxy resin-based wood coating according to claim 1, characterized in that, In step S2, the phase transfer catalyst is any one of tetrabutylammonium bromide, tetramethylammonium bromide, or N,N-dimethylbenzylamine.

6. A wood coating based on epoxy resin, characterized in that, It is produced by the production method described in any one of claims 1-5.

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