Low-odor woodware water-based photocuring material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of water-based wood paint, in particular to a low-odor wood water-based photocuring material as well as a preparation method and application thereof. The water-based light-cured coating is prepared from the following components in parts by weight: 50 to 60 parts of water-based light-cured resin, 15 to 30 parts of water-based polyurethane acrylic emulsion, 1 to 3 parts of coalescing agent, 0.1 to 0.5 part of defoaming agent, 1 to 5 parts of wetting dispersant, 0.1 to 1 part of thickening agent, 1 to 5 parts of flatting agent, 0.1 to 0.2 part of pH (Potential of Hydrogen) regulator, 1 to 3 parts of photoinitiator, 1 to 5 parts of hand feeling aid and 10 to 25 parts of water, the solid content of the water-based light-cured resin is 40% + / -1%, and the pH value is 7.0-7.5. According to the low-odor woodware water-based photocuring material as well as the preparation method and the application thereof provided by the invention, the odor removal property of a paint film in cabinet odor and closed occasions can be further improved on the basis of keeping the physical and chemical property advantages of an existing water-based UV type material.

Description

Technical Field

[0001] The present application relates to the technical field of water-based wood coatings, and in particular to a low-odor water-based photocurable material for wood, a preparation method thereof, and an application thereof. Background Art

[0002] Ultraviolet (UV) coatings can be divided into water-based UV curing coatings, UV curing powder coatings and solvent-based UV coatings. Compared with traditional UV coatings, water-based UV coatings can tend to zero volatile organic compounds (VOC), are non-flammable, have little environmental pollution and are safe; they have fast curing speed, save energy, have good curing performance, and are suitable for high-speed automated production. UV curing coatings are mainly composed of photoinitiators, oligomers, and active diluents. The UV curing reaction is an energy-induced polymerization reaction. In the presence of photoinitiators, the film-forming material can be cross-linked and cured in a few seconds through free radical reactions, and the curing is not inhibited by oxygen in the air.

[0003] The active diluents used in traditional solvent-based UV curing are mostly acrylic functional monomers, which shrink greatly after curing, affecting the adhesion of the coating. In addition, the active diluents are volatile and harmful to the human body. Water-based UV curing coatings do not contain diluent monomers, but use water as a diluent, which can solve the toxicity and irritation of volatile components and are a development direction for coatings.

[0004] At present, most of the domestic water-based UV curing coating synthetic emulsions are made of toluene diisocyanate as raw material, with too low double bond content and relative molecular weight, poor mechanical properties, and obviously insufficient odor-free paint film. As the market's requirements for the comprehensive performance of water-based coatings continue to increase, especially the strengthening of end-user environmental awareness, low-odor furniture is gaining more and more attention.

[0005] Therefore, a new wood photocuring material is needed to fill the market gap of low-odor water-based UV-curing coatings. Summary of the invention

[0006] The problem that the present application aims to solve is to provide a low-odor water-based photocurable material for wood, and a preparation method and application thereof, which can further improve the odor-free performance of the paint film in cabinet odors and enclosed places while retaining the physical and chemical performance advantages of existing water-based UV-type materials.

[0007] In order to solve the above problems, this application adopts the following technical solutions:

[0008] On the one hand, the present application provides a low-odor wood water-based light-curing material, which comprises, by weight:

[0009]

[0010]

[0011] Wherein, the water-based light-curable resin comprises aliphatic polyurethane acrylate, the solid content of the water-based light-curable resin is 40%±1%, and the pH value is 7.0-7.5.

[0012] In some embodiments, the fatty polyurethane acrylate includes one of Zhanchen New Materials S6500 and long-chain POLYCL-1207.

[0013] In some embodiments, the aqueous polyurethane acrylic emulsion includes DSM NeoPac E-129

[0014] Furthermore, the film-forming aid is prepared by mixing diethylene glycol butyl ether and dipropylene glycol butyl ether in a ratio of 1:1.

[0015] Furthermore, the defoaming agent includes at least one of organic siloxanes and polyether-modified silicons.

[0016] In some embodiments, the organosiloxane includes BYK024 produced by German BYK Company, and the polyether-modified silicon compound includes TEGO foamex 810 produced by EVONIK Company.

[0017] Furthermore, the wetting and dispersing agent includes at least one of anionic type and multifunctional type that does not contain solvent and ethoxylated nonylphenol.

[0018] In some embodiments, the anionic type includes TEGO Dispers 755W from TEGO, Germany, and the multifunctional type includes TEGO Dispers 760W from TEGO, Germany.

[0019] Furthermore, the thickener includes at least one of acrylic acid and polyurethane.

[0020] In some embodiments, the acrylic type includes one of Thixol 53L and Rohm and Haas TT-935 thickeners from COATEX of France, and the polyurethane type includes one of Coapur 830w and RM-8W thickeners from COATEX of France.

[0021] Furthermore, the matting agent includes amorphous silicon dioxide.

[0022] In some embodiments, the amorphous silica includes one of Grace SY7000 and Evonik EXP 8018-1.

[0023] Furthermore, the pH regulator includes one of an alcohol amine and a multifunctional pH regulator.

[0024] In some embodiments, the alcohol amine includes Dow AMP-95, and the multifunctional pH adjuster includes Mary Chemical N-6.

[0025] Furthermore, the photoinitiator includes a cleavage-type photoinitiator and a water-soluble TPO photoinitiator.

[0026] In some embodiments, the cleavage-type photoinitiator includes 1173, and the water-soluble TPO photoinitiator includes API-590 of Youwei Technology.

[0027] Furthermore, the feel aid comprises modified polyethylene wax.

[0028] In some embodiments, the modified polyethylene wax includes JZJ W171A.

[0029] In another aspect, the present application provides a method for preparing the low-odor wood water-based photocurable material, comprising the following steps:

[0030] S1. Add water-based photocurable resin, water-based polyurethane acrylic emulsion, film-forming aid and defoaming agent into a stirring kettle, and disperse at a speed of 1200-1500 r / min until there is no oil shrinkage to obtain a primary dispersed phase; S2. Adjust the speed of the stirring kettle to 800-1000 r / min, add a wetting dispersant, a matting agent and a hand feel aid into the primary dispersed phase, and disperse at a speed of 1200-1500 r / min until the fineness is qualified to obtain a secondary dispersed phase; S3. Add a thickener, a pH adjuster, a photoinitiator and water into the secondary dispersed phase, and disperse at a speed of 500-800 r / min for 15-20 minutes to obtain the low-odor water-based photocurable material for wood furniture.

[0031] On the other hand, the present application provides the application of the above-mentioned low-odor wood water-based photocurable material or the above-mentioned method as a wood coating, characterized in that it includes the following steps: weigh the low-odor wood water-based photocurable material, add 0.05 to 0.1 times of water to dilute it to the construction viscosity, and then apply it on the polished substrate, the coating amount is controlled at 120g / m2, leveling at room temperature for 2 to 3 minutes to make the surface smooth, and then baking at 50°C for 15 to 20 minutes until the paint film is dry and then using a UV machine with an energy of 300mj / m2 for curing.

[0032] This application has the following beneficial effects:

[0033] 1. The low-odor wood water-based light-curing material provided in this application has good performance in terms of feel, hardness, light and heat resistance, density, etc. after curing, and has excellent water resistance, and has little or no odor after use.

[0034] 2. The wood finishing material provided in this application is a water-based environmentally friendly product that meets the standards of "GB18581-2020" for the limit of harmful substances in wood coatings, "GB / T 23999-2009" for water-based wood coatings for interior decoration, and "GB / T3324-2017" for technical requirements for wooden furniture. At the same time, the paint film performance is comparable to that of solvent-based photocuring materials, and is suitable for bamboo, wood, plastic, and leather fields. DETAILED DESCRIPTION

[0035] The technical solutions in some embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments provided by the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present application.

[0036] Example 1

[0037] Follow these steps to prepare a low-odor water-based light-curing wood material:

[0038] S1. 60 parts of water-based light-curable resin S6500 and 15 parts of water-based polyurethane acrylic emulsion NeoPac E-129 were added to a stirring tank, stirred at a speed of 1200 r / min, and 1.5 parts of dipropylene glycol butyl ether, 1.5 parts of diethylene glycol butyl ether, 0.2 parts of defoamer BYK024 and 0.3 parts of defoamer TEGO foamex 810 were added at the same time, and the stirring and dispersion were continued for 15 minutes. After the oil-free shrinkage was detected, a primary dispersed phase was obtained;

[0039] S2. The stirring tank speed was adjusted to 800 r / min, 5 parts of wetting dispersant TEGO Dispers 760W, 5 parts of matting agent SY-7000 and 5 parts of feel additive W171A were added to the primary dispersed phase, the stirring tank speed was adjusted to 1200 r / min for 20 min, and the scraper was scraped to a fineness of ≤25 um to obtain a secondary dispersed phase;

[0040] S3. Adjust the stirring tank speed to 650r / min, add 0.1 part of thickener RM-8W, 0.2 part of pH adjuster N-6, 3 parts of photoinitiator API-590 and 25 parts of water were added to the secondary dispersed phase and dispersed for 15 minutes to obtain the low-odor water-based UV wall material.

[0041] Example 2

[0042] Follow these steps to prepare a low-odor water-based light-curing wood material:

[0043] S1. 55 parts of water-based photocurable resin POLYCL-1207 and 22 parts of water-based polyurethane acrylic emulsion NeoPac E-129 were added to a stirring tank, stirred at a speed of 1300 r / min, and 1 part of dipropylene glycol butyl ether, 1 part of diethylene glycol butyl ether, 0.2 parts of defoamer BYK024 and 0.1 parts of defoamer TEGO foamex 810 were added at the same time, and the stirring and dispersion were continued for 15 minutes. After the oil-free shrinkage was detected, a primary dispersed phase was obtained;

[0044] S2. The stirring tank speed was adjusted to 900 r / min, 2 parts of wetting dispersant TEGO Dispers 760W, 1 part of wetting dispersant TEGO Dispers 755W, 3 parts of matting agent SY-7000 and 3 parts of feel additive W171A were added to the primary dispersed phase, the stirring tank speed was adjusted to 1300 r / min for 20 min, and the scraper was scraped to a fineness of ≤25 um to obtain a secondary dispersed phase;

[0045] S3. The speed of the stirring kettle was adjusted to 650 r / min, 0.2 parts of thickener Thixol 53L, 0.2 parts of thickener Coapur830w, 0.2 parts of thickener RM-8W, 0.15 parts of pH adjuster AMP-95, 3 parts of photoinitiator API-590 and 12 parts of water were added to the secondary dispersed phase, and dispersed for 15 minutes to obtain the low-odor water-based UV wall material.

[0046] Example 3

[0047] Follow these steps to prepare a low-odor water-based light-curing wood material:

[0048] S1. 50 parts of water-based light-curable resin S6500 and 15 parts of water-based polyurethane acrylic emulsion NeoPac E-129 were added to a stirring tank, stirred at a speed of 1500 r / min, and 0.5 parts of dipropylene glycol butyl ether, 0.5 parts of diethylene glycol butyl ether, and 0.1 parts of defoamer BYK024 were added at the same time, and the stirring and dispersion were continued for 15 minutes. After the oil-free shrinkage was detected, a primary dispersed phase was obtained;

[0049] S2. The stirring tank speed was adjusted to 1000 r / min, 0.5 parts of wetting dispersant TEGO Dispers 760W, 0.5 parts of wetting dispersant TEGO Dispers 755W, 1 part of matting agent EXP 8018-1 and 1 part of feel additive W171A were added to the primary dispersed phase, the stirring tank speed was adjusted to 1500 r / min and dispersed for 20 min, and the scraper was scraped to a fineness of ≤25 um to obtain a secondary dispersed phase;

[0050] S3. Adjust the stirring tank speed to 800r / min, 0.2 parts of thickener Thixol 53L, 0.2 parts of thickener TT-935, 0.2 parts of thickener Coapur830w, 0.4 parts of thickener RM-8W, 0.1 parts of pH adjuster N-6, 0.5 parts of photoinitiator 1173, 0.5 parts of photoinitiator API-590 and 10 parts of water were added to the secondary dispersed phase and dispersed for 15 minutes to obtain the low-odor water-based UV wall material.

[0051] Comparative Example 1

[0052] Follow these steps to prepare a low-odor water-based light-curing wood material:

[0053] S1. 60 parts of water-based photocurable resin POLYCL-1207 and 15 parts of water-based polyurethane acrylic emulsion NeoPac E-129 were added to a stirring tank, stirred at a speed of 1200 r / min, and 1.5 parts of dipropylene glycol butyl ether, 1.5 parts of diethylene glycol butyl ether, 0.2 parts of defoamer BYK024 and 0.3 parts of defoamer TEGO foamex 810 were added at the same time, and the stirring and dispersion were continued for 15 minutes. After the oil-free shrinkage was detected, a primary dispersed phase was obtained;

[0054] S2. The stirring tank speed was adjusted to 800 r / min, 5 parts of wetting dispersant TEGO Dispers 760W, 5 parts of matting agent SY-7000 and 5 parts of feel additive W171A were added to the primary dispersed phase, the stirring tank speed was adjusted to 1200 r / min for 20 min, and the scraper was scraped to a fineness of ≤25 um to obtain a secondary dispersed phase;

[0055] S3. Adjust the stirring tank speed to 650r / min, add 0.1 parts of thickener RM-8W, 0.2 parts of pH adjuster AMP-95, 3 parts of photoinitiator 1173 and 25 parts of water to the secondary dispersed phase, disperse for 15 minutes, and obtain the low-odor water-based UV wall material.

[0056] Experimental Example 1 Basic Material Testing Indicators

[0057] The fineness, Stormer viscosity, state and solid content of the low-odor wood water-based photocurable materials prepared in Examples 1 to 3 and Comparative Example 1 were tested. The test results are shown in Table 1.

[0058] Table 1:

[0059]

[0060] Experimental Example 2

[0061] The low-odor wood water-based photocurable material of the present invention can be applied to different furniture scenes. The paint film performance of the low-odor wood water-based photocurable material prepared in Examples 1 to 3 and Comparative Example 1 was evaluated. All these tests were carried out on a 10cm×30cm×2cm ash board of transparent photocurable material. The specific operation method is: dilute water and low-odor wood water-based photocurable material with a construction ratio of (0.05-0.1):1 (0.1:1 in this experimental example) to the construction viscosity, and then spray it on the ash board, and the net coating amount is 120g / m 2 , then leveled at room temperature for 2 to 3 minutes (2 minutes in this experiment), and then placed in a 50℃ blast drying oven for 15 to 20 minutes (15 minutes in this experiment), and finally the energy was 300mj / m 2 The paint was cured in a UV curing machine to form a transparent paint film. The hardness, adhesion, liquid resistance, chemical resistance, odor tightness and appearance were evaluated according to different standards. The test results are shown in Table 2.

[0062] Table 2:

[0063]

[0064]

[0065] In summary, the low-odor water-based light-curing (UV) topcoat material of the present invention has obvious advantages in odor over conventional water-based UV materials, and the physical and chemical properties of the paint film meet the stringent requirements. Its standards fully comply with the limits of harmful substances in wood coatings "GB 18581-2020", water-based wood coatings for interior decoration "GB / T 23999-2009" and technical requirements for wooden furniture "GB / T3324-2017" standards.

[0066] The above is only a preferred embodiment of the present application. It should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge in the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present application, and shall be within the scope of protection of the claims attached to the present application.

Claims

1. Low odor wood water-based light-curing material, characterized in that: In parts by weight: Wherein, the water-based light-curable resin comprises aliphatic polyurethane acrylate, the solid content of the water-based light-curable resin is 40%±1%, and the pH value is 7.0-7.

5.

2. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The film-forming aid is prepared by mixing diethylene glycol butyl ether and dipropylene glycol butyl ether in a ratio of 1:

1.

3. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The defoaming agent includes at least one of organic siloxanes and polyether-modified silicons.

4. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The wetting and dispersing agent includes at least one of anionic type and multifunctional type containing no solvent and ethoxylated nonylphenol.

5. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The thickener includes at least one of acrylic and polyurethane.

6. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The matting agent includes amorphous silicon dioxide.

7. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The photoinitiator includes at least one of a cleavage-type photoinitiator and a water-soluble TPO photoinitiator.

8. The low-odor water-based light-curing material for woodware according to claim 1, characterized in that: The hand feel aid comprises modified polyethylene wax.

9. A method for preparing the low-odor water-based light-curing material for woodware according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Add an aqueous light-curable resin, an aqueous polyurethane acrylic emulsion, a film-forming aid and a defoaming agent into a stirring kettle and disperse at a speed of 1200 to 1500 r / min until there is no oil shrinkage to obtain a primary dispersed phase; S2. The wetting dispersant, matting agent and feel aid are added to the primary dispersed phase and dispersed at a speed of 1200 to 1500 r / min to a qualified fineness to obtain a secondary dispersed phase; S3. Add a thickener, a pH adjuster, a photoinitiator and water to the secondary dispersed phase, and disperse at a speed of 500 to 800 r / min for 15 to 20 minutes to obtain the low-odor wood water-based photocurable material.

10. Use of the low-odor wood water-based photocurable material according to any one of claims 1 to 8 or the method according to claim 9 as a wood coating, characterized in that: The following steps are involved: Weigh the low-odor wood water-based light-curing material, add 0.05-0.1 times of water to dilute to the construction viscosity, and then apply it on the polished substrate. The coating amount is controlled at 120g / m 2 , leveling at room temperature for 2 to 3 minutes to make the surface flat, then bake at 50°C for 15 to 20 minutes until the paint film is dry, then use energy of 300mj / m 2 UV machine for curing.

Images