Epoxy resin-based woodware finish paint and production method thereof

Abstract

The invention relates to the technical field of finish paint, and discloses a woodware finish paint based on epoxy resin and a production method thereof.The woodware finish paint is formed by mixing epoxy resin serving as a film forming matter with auxiliary materials such as a modified mica powder reinforcing component, and the modified mica powder reinforcing component is prepared by grafting a macromolecular modifier to the surface of mica powder; the existence of the high-molecular modifier is equivalent to formation of an organic transition layer between the mica powder and the epoxy resin, so that the interface bonding performance between the mica powder and the epoxy resin can be greatly improved, the mica powder can be uniformly dispersed in the epoxy resin, the advantages of an inorganic reinforcing agent can be efficiently exerted, and stress dispersion and transfer effects are generated; the impact resistance of the paint film is improved. In addition, the polymer modifier contains a silica and benzene fluorine alternating structure, the structure has very strong hydrophobic performance, and after the polymer modifier is mutually wound with an epoxy resin molecular chain, a paint film can form a super-hydrophobic surface, so that the paint film is endowed with self-cleaning performance.

Description

Technical Field

[0001] The present invention relates to the technical field of topcoats, and particularly to a wood topcoat based on epoxy resin and a production method thereof. Background Art

[0002] Wood topcoat is an important material for coating the surface of wood products. It can not only beautify the appearance of wood products, but also improve their durability and protection performance. Among many wood topcoats, coatings with epoxy resin as the main film-forming substance are favored due to their unique properties. This is mainly because epoxy resin has excellent adhesion, good corrosion resistance and moisture resistance, etc. Although the epoxy resin film is tough and wear-resistant, limited by the structure of epoxy resin itself, its brittleness is relatively large and the impact strength is relatively low after complete curing. When receiving a large external force impact, the film may crack or break, and it cannot effectively protect the wood. In addition, the film will inevitably be contaminated with oil during use, greatly affecting the appearance, and the epoxy resin topcoat does not have a self-cleaning effect and is difficult to clean. Therefore, it is of great significance to improve the functionality of the epoxy resin topcoat for its further application.

[0003] The invention patent with the publication number of CN113292904B discloses a two-component wear-resistant and toughened modified waterborne epoxy resin floor paint and a preparation method thereof. By preparing capped polyester amide modified nano MoO 3 @MoS 2 as the curing agent of epoxy resin, the comprehensive properties such as the toughness of the epoxy resin floor paint are improved. Therefore, by improving the components of the epoxy resin topcoat, the enhancement and toughening of the epoxy resin film can be realized, 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 the present invention is to provide a wood topcoat based on epoxy resin and a production method thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A production method of a wood topcoat based on epoxy resin, the wood topcoat is made of raw materials including the following parts by weight:

[0007]

[0008] The production method of the wood topcoat includes the following steps:

[0009] First step, weigh each raw material according to the parts by weight and set aside;

[0010] Step 2: Add epoxy resin, modified mica powder reinforcing component, dispersant, leveling agent and organic solvent into a mixing kettle, continuously stir and mix at a stirring rate of 1000 - 2000 r / min for 1 - 2 h, then adjust the stirring rate to 200 - 300 r / min, add defoaming agent into the mixing kettle, stir for 20 - 30 min, and then let it stand for 1 - 2 h to form a paint precursor;

[0011] Step 3: Add curing agent into the paint precursor, stir and mix at a stirring rate of 100 - 200 r / min for 10 - 30 min to obtain the woodware topcoat.

[0012] As a further solution of the present invention, the epoxy resin is any one of bisphenol A epoxy resin or bisphenol F epoxy resin.

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

[0014] Step A: Ultrasonically disperse mica powder in an ethanol aqueous solution with a volume fraction of 60 - 70%, then add silane coupling agent to the formed dispersion. After adding, raise the temperature to 70 - 80°C, stir for 6 - 9 h, and then separate the solid material to obtain functionalized mica powder;

[0015] Step B: Add mica powder into 1,4 - dioxane, ultrasonically disperse for 20 - 40 min, then add a polymer modifier. After adding, raise the temperature to 60 - 70°C, keep stirring for 4 - 8 h, and then centrifuge to separate the solid material to obtain the modified mica powder reinforcing component.

[0016] As a further solution 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 solution of the present invention, in Step B, the specific preparation method of the polymer modifier is as follows:

[0018] Step S1: Add glycerol diglycidyl ether, 3,5 - bis(trifluoromethyl)phenyl isocyanate and toluene into a reaction kettle, start stirring. After forming a uniform reaction solution, add a metal catalyst into the reaction kettle. After adding, start heating, raise the temperature to 70 - 80°C, keep the reaction for 8 - 12 h, then evaporate and remove the solvent, collect the product, and after purification treatment, obtain a bridging agent;

[0019] Step S2: Add 1,1,3,3,5,5 - hexamethyltrisiloxane - 1,5 - diol into N,N - dimethylformamide, protect it by introducing nitrogen, stir mechanically, then add a bridging agent and a phase - transfer catalyst. After adding, control the heating rate at 3 - 4 °C / min, raise the temperature to 80 - 90 °C, continuously stir and polymerize for 12 - 18 h, then cool down and discharge to obtain a polymer modifier.

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

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

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

[0023] As a further scheme 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 - mentioned technical scheme, first, the surface of mica powder is modified with an amino - silane coupling agent to achieve the amino - functionalization modification of mica powder and obtain functionalized mica powder.

[0025] Using glycerol diglycidyl ether and 3,5 - bis(trifluoromethyl)phenyl isocyanate as reactants, under the action of a metal catalyst, the active hydroxyl groups in their structures can undergo aminolysis reactions with highly active isocyanate groups to obtain an intermediate containing two equivalents of epoxy groups in its structure, that is, a bridging agent. Then, under the action of a phase - transfer catalyst, the epoxy groups in the structure of the bridging agent can continuously carry out ring - opening addition with the active hydroxyl groups in the structure of 1,1,3,3,5,5 - hexamethyltrisiloxane - 1,5 - diol. By controlling the molar ratio of the two, a polymer modifier with epoxy groups at the ends of the structure and a block - alternating structure can be obtained.

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

[0027] A wood topcoat based on epoxy resin is prepared by using the above - mentioned production method.

[0028] The beneficial effects of the present invention:

[0029] The present invention prepares a modified mica powder reinforcing component by grafting a polymer modifier onto the surface of mica powder. First, the presence of the polymer modifier is equivalent to forming an organic transition layer between the mica powder and the epoxy resin. Moreover, the hydroxyl groups generated by the ring-opening reaction in the structure of the polymer diluent can participate in the curing process of the epoxy resin. Therefore, the interfacial bonding performance between the mica powder and the epoxy resin can be greatly improved, promoting the uniform dispersion of the mica powder in the epoxy resin. After its curing, the mica powder will be uniformly present in the paint film, and it can exert the advantages of its own inorganic reinforcing agent, producing stress dispersion and transfer effects, and improving the impact resistance of the paint film. In addition, the polymer modifier contains an alternating structure of siloxane and benzofluoro, and this structure has extremely strong hydrophobic properties. After being intertwined with the molecular chain of the epoxy resin, it can make the paint film form a superhydrophobic surface, endowing the paint film with self-cleaning properties.

[0030] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is an infrared analysis test chart of the polymer modifier. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] Preparation Example 1

[0035] Preparation of the modified mica powder reinforcing component:

[0036] Step A: Ultrasonically disperse 2.5 g of mica powder in an ethanol aqueous solution with a volume fraction of 70%. Then, add 4 g of 3-aminopropyltriethoxysilane to the formed dispersion. After adding, raise the temperature to 75 °C and stir for 8 h. Then, separate the solid material to obtain functionalized mica powder.

[0037] Step B: Add 1.8 g of mica powder into 1,4-dioxane, ultrasonically disperse for 30 min, then add 5 g of polymer modifier. After adding, raise the temperature to 65 °C, keep stirring for 6 h, and then centrifuge to separate the solid material to obtain the modified mica powder strengthening component.

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

[0039] Step S1: Add 0.4 g of glycerol diglycidyl ether, 0.5 g of 3,5-bis(trifluoromethyl)phenyl isocyanate and toluene into the reaction kettle, start stirring. After forming a uniform reaction solution, add 0.01 g of dibutyltin dilaurate into the reaction kettle. After adding, start heating, raise the temperature to 75 °C, keep reacting for 9 h, then evaporate and remove the solvent, collect the product, and after purification treatment, obtain the bridging agent;

[0040] Step S2: Add 0.2 g of 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol into N,N-dimethylformamide, introduce nitrogen for protection, and stir mechanically. Then add 0.4 g of bridging agent and 0.01 g of tetrabutylammonium bromide. After adding, control the heating rate at 3 °C / min, raise the temperature to 90 °C, keep stirring and polymerizing for 16 h, then cool down and discharge to obtain the polymer modifier.

[0041] Figure 1 is the infrared analysis test chart of the polymer modifier, in which the characteristic absorption peak at 3389 cm -1 is the characteristic absorption peak of the hydroxyl group generated by the ring-opening reaction, and the characteristic absorption peaks at 3000 cm -1 ~3100 cm -1 are the characteristic absorption peaks of the carbon-hydrogen of the benzene ring skeleton, the characteristic absorption peak at 1733 cm -1 is the characteristic absorption peak of the carbon-oxygen in the amine ester group, the characteristic absorption peak at 1391 cm -1 is the characteristic absorption peak of carbon-fluorine, and the characteristic absorption peaks at 1000 cm -1 ~1100 cm -1 are the characteristic absorption peaks of the overlapping silicon-oxygen and ether bonds.

[0042] Example 1

[0043] A wood topcoat based on epoxy resin is made of the following raw materials by weight:

[0044]

[0045] The production method of the wood topcoat includes the following steps:

[0046] The first step: Weigh each raw material according to the weight parts and set aside;

[0047] Step 2: Add epoxy resin, modified mica powder reinforcing component, dispersant, leveling agent and organic solvent into a mixing kettle, continuously stir and mix at a stirring rate of 1000 r / min for 2 h, then adjust the stirring rate to 200 r / min, add an antifoaming agent into the mixing kettle, stir for 30 min, and then let it stand for 1 h to form a paint precursor;

[0048] Step 3: Add a curing agent into the paint precursor, stir and mix at a stirring rate of 100 r / min for 30 min to obtain the woodware topcoat.

[0049] Among them, E51 type epoxy resin is selected as the epoxy resin; the modified mica powder reinforcing component prepared in Preparation Example 1 is selected as the modified mica powder reinforcing component; BYK-310 is selected as the leveling agent; BYK-085 is selected as the antifoaming agent; tetrahydrophthalic anhydride is selected as the acid anhydride curing agent; xylene is selected as the organic solvent, and the same applies hereinafter.

[0050] Example 2

[0051] A woodware topcoat based on epoxy resin is prepared from raw materials including the following parts by weight:

[0052]

[0053] The production method of the woodware topcoat includes the following steps:

[0054] Step 1: Weigh each raw material according to the parts by weight and set aside;

[0055] Step 2: Add epoxy resin, modified mica powder reinforcing component, dispersant, leveling agent and organic solvent into a mixing kettle, continuously stir and mix at a stirring rate of 1500 r / min for 1 h, then adjust the stirring rate to 200 r / min, add an antifoaming agent into the mixing kettle, stir for 25 min, and then let it stand for 1 h to form a paint precursor;

[0056] Step 3: Add a curing agent into the paint precursor, stir and mix at a stirring rate of 150 r / min for 20 min to obtain the woodware topcoat.

[0057] Example 3

[0058] A woodware topcoat based on epoxy resin is prepared from raw materials including the following parts by weight:

[0059]

[0060] The production method of the woodware topcoat includes the following steps:

[0061] Step 1: Weigh each raw material according to the weight parts and set aside;

[0062] Step 2: Add epoxy resin, modified mica powder strengthening component, dispersant, leveling agent and organic solvent into the mixing kettle, continuously stir and mix at a stirring rate of 2000 r / min for 1 h, then adjust the stirring rate to 300 r / min, add defoaming agent into the mixing kettle, stir for 20 min, and then stand for 2 h to form a paint precursor;

[0063] Step 3: Add the curing agent into the paint precursor, stir and mix at a stirring rate of 200 r / min for 10 min to obtain the woodware topcoat.

[0064] Comparative Example 1

[0065] A woodware topcoat based on epoxy resin is made of raw materials including the following weight parts:

[0066]

[0067]

[0068] The production method of the woodware topcoat includes the following steps:

[0069] Step 1: Weigh each raw material according to the weight parts and set aside;

[0070] Step 2: Add epoxy resin, mica powder, dispersant, leveling agent and organic solvent into the mixing kettle, continuously stir and mix at a stirring rate of 1500 r / min for 1 h, then adjust the stirring rate to 200 r / min, add defoaming agent into the mixing kettle, stir for 25 min, and then stand for 1 h to form a paint precursor;

[0071] Step 3: Add the curing agent into the paint precursor, stir and mix at a stirring rate of 150 r / min for 20 min to obtain the woodware topcoat.

[0072] Comparative Example 2

[0073] A woodware topcoat based on epoxy resin is made of raw materials including the following weight parts:

[0074]

[0075] The production method of the woodware topcoat includes the following steps:

[0076] Step 1: Weigh each raw material according to the weight parts and set aside;

[0077] Step 2: Add epoxy resin, polymer modifier, dispersant, leveling agent and organic solvent into the mixing kettle, continuously stir and mix at a stirring rate of 1500 r / min for 1 h. Then adjust the stirring rate to 200 r / min, add defoaming agent into the mixing kettle, stir for 25 min, and then let it stand for 1 h to form a paint precursor;

[0078] Step 3: Add the curing agent into the paint precursor, stir and mix at a stirring rate of 150 r / min for 20 min to obtain the woodware topcoat.

[0079] The preparation method of the polymer modifier can be seen in Preparation Example 1.

[0080] Comparative Example 3

[0081] A woodware topcoat based on epoxy resin is made of raw materials including the following parts by weight:

[0082]

[0083] The production method of the woodware topcoat includes the following steps:

[0084] Step 1: Weigh each raw material according to the parts by weight and set aside;

[0085] Step 2: Add epoxy resin, dispersant, leveling agent and organic solvent into the mixing kettle, continuously stir and mix at a stirring rate of 1500 r / min for 1 h. Then adjust the stirring rate to 200 r / min, add defoaming agent into the mixing kettle, stir for 25 min, and then let it stand for 1 h to form a paint precursor;

[0086] Step 3: Add the curing agent into the paint precursor, stir and mix at a stirring rate of 150 r / min for 20 min to obtain the woodware topcoat.

[0087] Test Example

[0088] Make the woodware topcoats in the examples and comparative examples into paint films and conduct 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: Refer to the standard GB / T 1732-2020 to test the impact performance of the paint film; use a TC-A3 type automatic contact angle measuring instrument to test the water contact angle of the paint film.

[0092] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, including the best mode, and also enables 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 for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The protection scope of the present invention 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 the literal description of the claims, or if they include equivalent structural elements that have no substantial difference from the literal description of 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, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for producing a wood finish based on epoxy resin, characterized in that: The wood finish is made from the following raw materials in parts by weight: The production method of the wood finish comprises the following steps: The first step is to weigh each raw material according to its weight and set aside; Step 2: Add epoxy resin, modified mica powder reinforcing component, dispersant, leveling agent and organic solvent into the mixing kettle, stir and mix continuously at a stirring rate of 1000-2000r / min for 1-2h, then adjust the stirring rate to 200-300r / min, add defoamer into the mixing kettle, stir for 20-30min, and let stand for 1-2h to form a paint precursor; The third step is to add the curing agent into the paint precursor, stir and mix at a stirring rate of 100-200r / min for 10-30min to obtain the wood finish.

2. The method for producing a wood finish based on epoxy resin according to claim 1, characterized in that: The epoxy resin is any one of bisphenol A epoxy resin and bisphenol F epoxy resin.

3. The method for producing a wood finish based on epoxy resin according to claim 1, characterized in that: The specific preparation method of the modified mica powder reinforcing component comprises the following steps: Step A, using a silane coupling agent to modify the surface of mica powder to obtain functionalized mica powder; Step B: Further modifying the functionalized mica powder using a polymer modifier to obtain a modified mica powder reinforcement component.

4. The method for producing a wood finish based on epoxy resin 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.

5. The method for producing a wood finish based on epoxy resin according to claim 1, characterized in that: In step B, the specific preparation method of the polymer modifier is as follows: Step S1, adding glycerol diglycidyl ether, 3,5-bis(trifluoromethyl)phenyl isocyanate and toluene into a reaction kettle, starting stirring, and after forming a uniform reaction liquid, adding a metal catalyst into the reaction kettle, after the addition is completed, starting heating, raising the temperature to 70-80° C., keeping the temperature for reaction for 8-12 hours, evaporating and removing the solvent, collecting the product, and purifying it to obtain a bridging agent; Step S2, adding 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol to N,N-dimethylformamide, introducing nitrogen protection, mechanically stirring, and then adding a bridging agent and a phase transfer catalyst. After the addition is completed, the heating rate is controlled to be 3-4°C / min, the temperature is increased to 80-90°C, and the polymerization is continuously stirred for 12-18 hours, and then the temperature is reduced and the material is discharged to obtain a polymer modifier.

6. The method for producing a wood finish based on epoxy resin according to claim 5, characterized in that: In step S1, the molar ratio of glycerol diglycidyl ether to 3,5-bis(trifluoromethyl)phenyl isocyanate is 1:

1.

7. The method for producing a wood finish based on epoxy resin according to claim 5, characterized in that: In step S1, the metal catalyst is dibutyltin dilaurate or stannous octoate.

8. The method for producing a wood finish based on epoxy resin according to claim 5, characterized in that: In step S2, the molar ratio of the 1,1,3,3,5,5-hexamethyltrisiloxane-1,5-diol to the bridging agent is 1:1-1.

2.

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

10. A wood finish based on epoxy resin, characterized in that: The method is prepared by the production method according to any one of claims 1 to 9.

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