LED light source cured UV spraying white primer for pine wood and preparation method of LED light source cured UV spraying white primer

Abstract

The invention relates to the technical field of spraying primer, in particular to LED light source cured UV spraying white primer for pine and a preparation method thereof.The LED light source cured UV spraying white primer is prepared from, by mass, 25-75 parts of matrix resin, 15-45 parts of acrylate monomers, 0.5-1 part of dispersing agent, 0.6-1.5 parts of defoaming agent, 0.1-0.5 part of flatting agent, 1-5 parts of photoinitiator, 10-30 parts of titanium dioxide and 10-33 parts of filler. Specific matrix resin and acrylate monomers are selected, specific technological procedures are combined for preparation, the odor is reduced, the adhesive force of the primer is kept, and meanwhile the cold and hot temperature difference resistance, the impact resistance and the boiling resistance of the primer can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of spray primers, and in particular to an LED light source-cured UV spray white primer for pine wood and a preparation method thereof. Background Art

[0002] At present, polyurethane and nitro systems are commonly used for spraying white primer on pine wood, but both of them have significant problems: the strong odor released is not conducive to environmental protection and human health; the drying process is slow, which leads to extended construction period, and requires a spacious space for separate storage until it is completely dry before it can be stacked, which seriously affects production efficiency. In contrast, UV white primer cured by LED light source shows great advantages. It dries very quickly and can be cured in just a few seconds. LED is a cold light source with low heat generation, which has little impact on the wood board. It can be directly stacked and stored after it is offline, which greatly saves time and space and reduces labor costs.

[0003] At present, the development momentum of light curing in my country is strong, and its application scope is also expanding. It has been widely used on a variety of substrates such as paper, wood, plastic, and metal, and has achieved remarkable results. With the increasing public awareness of environmental protection, more and more people tend to choose more environmentally friendly and suitable coating products.

[0004] Chinese patent CN102732133A discloses an anti-sagging spray primer, the raw materials of which include difunctional aliphatic polyurethane acrylate, modified epoxy acrylate, polyester acrylate, monomer, filler, photoinitiator, anti-sagging agent, defoamer and leveling agent. The use of this UV paint as a spray primer can avoid the sagging disadvantage of UV paint during the coating process, improve the overall painting efficiency, be environmentally friendly, and reduce the emission of organic solvents. However, the spray primer is not ideal in terms of resistance to cold and hot temperature differences, impact resistance and water resistance. Summary of the invention

[0005] In order to solve the problems in the prior art, the first aspect of the present invention provides a LED light source cured UV spray white primer for pine wood. The preparation raw materials include, by weight: 25-75 parts of base resin, 15-45 parts of acrylate monomers, 0.5-1 parts of dispersant, 0.6-1.5 parts of defoaming agent, 0.1-0.5 parts of leveling agent, 1-5 parts of photoinitiator, 10-30 parts of titanium dioxide, and 10-33 parts of filler.

[0006] In one embodiment, the base resin includes one or both of epoxy acrylate and polyurethane acrylate.

[0007] In a preferred embodiment, the matrix resin is epoxy acrylate and polyurethane acrylate.

[0008] In one embodiment, the mass ratio of the epoxy acrylate to the polyurethane acrylate is (2-7):(3-8).

[0009] In a preferred embodiment, the mass ratio of the epoxy acrylate to the polyurethane acrylate is any one of 1:2, 1:1, 2:3, 4:5, 5:8, and 1:4.

[0010] In a more preferred embodiment, the mass ratio of the epoxy acrylate to the polyurethane acrylate is 2:3.

[0011] In one embodiment, the epoxy acrylate is bisphenol A epoxy acrylate.

[0012] In one embodiment, the epoxy acrylate has a functionality of 2-4.

[0013] In a preferred embodiment, the functionality of the epoxy acrylate is 2.

[0014] In the present invention, the epoxy acrylate is not particularly limited, and epoxy acrylates provided by Sanmu Chemical, Changxing Chemical or Kailin Ruiyang can be mentioned.

[0015] In a preferred embodiment, the epoxy acrylate is of grade 6105-80, purchased from Jiangsu Sanmu Chemical.

[0016] In a preferred embodiment, the epoxy acrylate is of grade 621A-80, purchased from Changxing Chemical in Taiwan, China.

[0017] In a preferred embodiment, the epoxy acrylate is of grade 1101A80, purchased from Kailin Ruiyang Chemical.

[0018] In one embodiment, the polyurethane acrylate is a multifunctional polyurethane acrylate.

[0019] In a preferred embodiment, the multifunctional polyurethane acrylate is hexafunctional polyurethane acrylate.

[0020] In a more preferred embodiment, the hexafunctional polyurethane acrylate is 6145-100, purchased from Changxing Chemical Co., Ltd. in Taiwan, China.

[0021] In one embodiment, the acrylic ester monomer includes one or both of 1,6-hexanediol diacrylate and dipropylene glycol diacrylate.

[0022] In a preferred embodiment, the acrylic ester monomers are 1,6-hexanediol diacrylate and dipropylene glycol diacrylate.

[0023] In one embodiment, the mass ratio of 1,6-hexanediol diacrylate to dipropylene glycol diacrylate is (1-3):(2-6).

[0024] In a preferred embodiment, the mass ratio of 1,6-hexanediol diacrylate to dipropylene glycol diacrylate is any one of 1:2, 1:1, 2:1, 2:3, and 1:2.

[0025] In a more preferred embodiment, the mass ratio of 1,6-hexanediol diacrylate to dipropylene glycol diacrylate is 2:1.

[0026] In one embodiment, the 1,6-hexanediol diacrylate and dipropylene glycol diacrylate are both purchased from Sanmu Chemical.

[0027] In one embodiment, the brand of the dispersant includes one or more of BYK-110, BYK-163, and BYK-191.

[0028] In a preferred embodiment, the dispersant is BYK-110, purchased from BYK Chemicals.

[0029] In one embodiment, the defoaming agent is a non-silicon defoaming agent.

[0030] In a preferred embodiment, the non-silicon defoaming agent includes one or more brands of BYK052, Tego920, and BYK055.

[0031] In a more preferred embodiment, the non-silicone defoaming agent is of brands Tego920 and BYK055.

[0032] In one embodiment, the mass ratio of Tego920 to BYK055 is (1-5):(5-10).

[0033] In a preferred embodiment, the mass ratio of Tego920 to BYK055 is 3:7.

[0034] In one embodiment, the Tego920 is purchased from Digo, Germany, and the BYK055 is purchased from BYK Chemical.

[0035] In one embodiment, the brand of the leveling agent is selected from one or more of BYK358N, BYK333, and BYK3455.

[0036] In a preferred embodiment, the leveling agent is BYK358N, purchased from BYK Chemicals.

[0037] In one embodiment, the photoinitiator is of JRCure-1108, purchased from Jiuri New Materials.

[0038] In the present invention, the titanium dioxide is not particularly limited, and the titanium dioxide provided by DuPont and Xinfu can be mentioned.

[0039] In one embodiment, the titanium dioxide is R706, purchased from DuPont, USA.

[0040] In one embodiment, the filler includes one or both of talc and silicon dioxide.

[0041] In a preferred embodiment, the filler is talc and silicon dioxide.

[0042] In one embodiment, the mass ratio of talc to silicon dioxide is (10-30): (0.5-3).

[0043] In a preferred embodiment, the mass ratio of talc to silicon dioxide is 10:1.

[0044] In a preferred embodiment, the silicon dioxide comprises fumed silicon dioxide.

[0045] In a preferred embodiment, the fumed silica is of brand Hongsheng A360, purchased from Guangzhou Lingwei.

[0046] The second aspect of the present invention provides a method for preparing a UV spray white primer for pine wood cured by an LED light source, comprising the following steps: mixing a base resin and an acrylic ester monomer and stirring evenly, adding a dispersant, a defoaming agent, and a leveling agent in sequence and stirring evenly, adding a photoinitiator and titanium dioxide and stirring to adjust the fineness of the paint liquid, and finally adding a filler and stirring for 10-15 minutes to obtain the product.

[0047] In one embodiment, the fineness of the paint liquid is ≤30 μm.

[0048] In one embodiment, the base resin and the acrylic ester monomer are mixed and stirred at a rotation speed of 600-800 r / min, and the stirring time is 10-15 min.

[0049] In one embodiment, the preparation method comprises the following steps: stirring the base resin and the acrylic ester monomer at a speed of 600-800 r / min for 10-15 minutes, adding a dispersant, a defoamer, and a leveling agent in sequence, stirring at a speed of 600-800 r / min for 10-15 minutes, adding a photoinitiator and titanium dioxide, stirring at a speed of 800-1000 r / min for 15-20 minutes to adjust the fineness of the paint liquid to ≤30 μm, and finally adding a filler and stirring at a speed of 600-800 r / min for 10-15 minutes.

[0050] In a preferred embodiment, the preparation method comprises the following steps: stirring the base resin and the acrylic monomer at a speed of 700 r / min for 12 minutes, adding the dispersant, the defoaming agent and the leveling agent in sequence and stirring at a speed of 700 r / min for 12 minutes, adding the photoinitiator and the titanium dioxide and stirring at a speed of 900 r / min for 18 minutes to adjust the fineness of the paint liquid to ≤30 μm, and finally adding the filler and stirring at a speed of 700 r / min for 12 minutes.

[0051] Beneficial Effects

[0052] 1. In the present invention, by selecting specific epoxy acrylate and polyurethane acrylate for compounding, the mass ratio of epoxy acrylate to polyurethane acrylate is controlled to be (2-7): (3-8), which can improve the adhesion of the primer and the resistance to cold and hot temperature differences of the primer.

[0053] 2. Based on the system of the present invention, an acrylic ester monomer composed of 1,6-hexanediol diacrylate and dipropylene glycol diacrylate is used, and the mass ratio of 1,6-hexanediol diacrylate to dipropylene glycol diacrylate is controlled to be (1-3): (2-6). While maintaining the adhesion of the primer, the impact resistance and water boiling resistance of the primer can be improved.

[0054] 3. The preparation method of the LED light source-cured UV spray white primer for pine wood provided by the present invention can well realize the primer curing film formation, has good physical and chemical properties on the pine wood board, has low odor after the paint film is formed, and also has the properties of high filling, low odor and easy polishing.

[0055] 4. In the present application, specific base resins, acrylic monomers, dispersants, defoaming agents, etc. are selected and prepared in combination with specific process steps. While maintaining the adhesion of the primer, the primer's resistance to cold and hot temperature differences, impact resistance and water boiling resistance can be improved.

[0056] 5. The preparation method of the LED light source-cured UV spray white primer for pine wood provided by the present invention has a simple preparation process and can reduce production costs. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The experimental methods in the examples without specifying specific conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used without specifying the manufacturer are all conventional products that can be purchased commercially.

[0058] Example 1

[0059] The first aspect of the present embodiment provides a LED light source-cured UV spray white primer for pine wood. The raw materials for its preparation include, by weight: 50 parts of base resin, 30 parts of acrylate monomer, 0.7 parts of dispersant, 1 part of defoaming agent, 0.3 parts of leveling agent, 13 parts of photoinitiator, 20 parts of titanium dioxide, and 22 parts of filler.

[0060] The matrix resin is epoxy acrylate and polyurethane acrylate.

[0061] The mass ratio of the epoxy acrylate to the polyurethane acrylate is 2:3.

[0062] The epoxy acrylate has a brand number of 6105-80 and is purchased from Jiangsu Sanmu Chemical.

[0063] The polyurethane acrylate is a hexafunctional polyurethane acrylate with a grade of 6145-100, purchased from Changxing Chemical Industry, Taiwan, China.

[0064] The acrylic ester monomers are 1,6-hexanediol diacrylate and dipropylene glycol diacrylate.

[0065] The mass ratio of the 1,6-hexanediol diacrylate to the dipropylene glycol diacrylate is 2:1.

[0066] The 1,6-hexanediol diacrylate and dipropylene glycol diacrylate were both purchased from Sanmu Chemical.

[0067] The brand of the dispersant is BYK-110, purchased from BYK Chemicals.

[0068] The defoamer is a non-silicon defoamer. The brands of the non-silicon defoamer are Tego920 and BYK055. The mass ratio of Tego920 to BYK055 is 3:7.

[0069] The grade of the leveling agent is BYK358N, purchased from BYK Chemicals.

[0070] The brand of the photoinitiator is JRCure-1108, which is purchased from Jiuri New Materials.

[0071] The titanium dioxide is R706, purchased from DuPont, USA.

[0072] The filler is talcum powder and silicon dioxide. The mass ratio of the talcum powder to the silicon dioxide is 10:1. The silicon dioxide includes fumed silicon dioxide. The brand of the fumed silicon dioxide is Hongsheng A360, purchased from Guangzhou Lingwei.

[0073] The second aspect of the present embodiment provides a method for preparing a UV spray white primer for pine wood cured by an LED light source, comprising the following steps: stirring a base resin and an acrylic ester monomer at a speed of 700 r / min for 12 minutes, adding a dispersant, a defoaming agent, and a leveling agent in sequence and stirring at a speed of 700 r / min for 12 minutes, adding a photoinitiator and titanium dioxide and stirring at a speed of 900 r / min for 18 minutes to adjust the fineness of the paint liquid to ≤30 μm, and finally adding a filler and stirring at a speed of 700 r / min for 12 minutes.

[0074] Comparative Example 1

[0075] The first aspect of the present comparative example provides a LED light source-cured UV spray white primer for pine wood. The raw materials for its preparation include, by weight: 50 parts of base resin, 30 parts of acrylate monomers, 0.7 parts of dispersant, 1 part of defoaming agent, 0.3 parts of leveling agent, 13 parts of photoinitiator, 20 parts of titanium dioxide, and 22 parts of filler.

[0076] The matrix resin is epoxy acrylate and polyurethane acrylate.

[0077] The mass ratio of the epoxy acrylate to the polyurethane acrylate is 2:3.

[0078] The modified polyester acrylate has a grade of 6485 and is a 4-functionality modified polyester acrylate purchased from Baojun Chemical.

[0079] The polyurethane acrylate has a brand number of 6202 and is purchased from Sanmu Chemical.

[0080] The acrylic ester monomers are tripropylene glycol diacrylate and hydroxyethyl methacrylate.

[0081] The mass ratio of tripropylene glycol diacrylate to hydroxyethyl methacrylate is 2:1.

[0082] The tripropylene glycol diacrylate was purchased from Changxing Chemical, and the hydroxyethyl methacrylate was purchased from Allnex Chemical.

[0083] The brand of the dispersant is BYK-110, purchased from BYK Chemicals.

[0084] The defoamer is a non-silicon defoamer. The brands of the non-silicon defoamer are Tego920 and BYK055. The mass ratio of Tego920 to BYK055 is 3:7.

[0085] The grade of the leveling agent is BYK358N, purchased from BYK Chemicals.

[0086] The brand of the photoinitiator is JRCure-1108, which is purchased from Jiuri New Materials.

[0087] The titanium dioxide is R706, purchased from DuPont, USA.

[0088] The filler is talcum powder and silicon dioxide. The mass ratio of the talcum powder to the silicon dioxide is 10:1. The silicon dioxide includes fumed silicon dioxide. The brand of the fumed silicon dioxide is Hongsheng A360, purchased from Guangzhou Lingwei.

[0089] The second aspect of the present comparative example provides a method for preparing a UV spray white primer for pine wood cured by an LED light source, comprising the following steps: stirring a base resin and an acrylic ester monomer at a speed of 700 r / min for 12 minutes, adding a dispersant, a defoaming agent, and a leveling agent in sequence and stirring at a speed of 700 r / min for 12 minutes, adding a photoinitiator and titanium dioxide and stirring at a speed of 900 r / min for 18 minutes to adjust the fineness of the paint liquid to ≤30 μm, and finally adding a filler and stirring at a speed of 700 r / min for 12 minutes.

[0090] Performance Testing

[0091] Sample preparation: The primers prepared in Example 1 and Comparative Example 1 and the samples of commercially available primer 1 and commercially available primer 2 were coated according to the following coating process to obtain Sample 1, Sample 2, Sample 3 and Sample 4, respectively.

[0092] A1: After sanding the substrate with 240# sandpaper, spray the sample on the surface of the substrate with a film thickness of 100-120g / m 2 ; Infrared leveling at 40℃ for 8min;

[0093] A2: Use LED light at an intensity of 2000-4000mj / cm 2 After the lower curing, the sanding treatment is carried out, and the pine surface has a sanding bottom a;

[0094] A3: Spray the sample on the sanded bottom a of A2, with a film thickness of 100-120g / cm 2 Infrared leveling at 40℃ for 8min;

[0095] A4: Use LED light at an intensity of 2000-4000mj / cm 2 Next solidification.

[0096] The substrate is a pine board.

[0097] Adhesion test: GB / T 37005-2018 Clause 5.4.1 was tested according to the method of GB / T 4893.4. The results are shown in Table 1.

[0098] Test for resistance to temperature difference between hot and cold temperatures: GB / T 37005-2018 Clause 5.4.1 Test according to the method of GB / T 4893.7 to observe whether the paint surface has fading, whitening, bubbling and other defects. The results are shown in Table 1.

[0099] Water boiling resistance test: refer to GB / T 4893.1-2005 for testing, and observe whether the paint surface has blistering, cracking, peeling and other coating film pathological phenomena. The results are shown in Table 1.

[0100] Impact resistance test: The test was carried out in accordance with GB / T 1732-93 paint film impact resistance determination method. The results are shown in Table 1.

[0101] Flexibility test: The test was carried out according to GB / T 1731-93 paint film flexibility determination method. The results are shown in Table 1.

[0102] VOC content test: Tested in accordance with GB / T1728-1979. The results are shown in Table 1.

[0103] Hardness test: The test was carried out in accordance with GB / T 6739-2009. The results are shown in Table 1.

[0104] Cutting performance test: Place the sample on an electronic automatic cutting machine for edge trimming and observe whether there is edge collapse on the cutting surface.

[0105] Table 1

[0106] Sample 1 Sample 2 Sample 3 Sample 4 Cutting performance none none have have Adhesion Level 0-1 Level 1 Level 4 Level 1 Resistance to hot and cold temperature difference none Cracking Cracking Bubbling, cracking hardness H B H 2H VOC Content 50g / L 50g / L 500g / L 200g / L Flexibility 3# 4# 1# 1# Impact resistance 15cm 20cm 5cm 5cm Boiling water resistance none White White none

Claims

1. A LED light source cured UV spray white primer for pine wood, characterized in that: The raw materials for its preparation include, by weight: 25-75 parts of base resin, 15-45 parts of acrylate monomers, 0.5-1 parts of dispersant, 0.6-1.5 parts of defoamer, 0.1-0.5 parts of leveling agent, 1-5 parts of photoinitiator, 10-30 parts of titanium dioxide, and 10-33 parts of filler.

2. The LED light source-cured UV spray white primer for pine wood according to claim 1, characterized in that: The matrix resin includes one or both of epoxy acrylate and polyurethane acrylate.

3. The LED light source-cured UV spray white primer for pine wood according to claim 2, characterized in that: The mass ratio of the epoxy acrylate to the polyurethane acrylate is (2-7):(3-8).

4. The LED light source-cured UV spray white primer for pine wood according to claim 2 or 3, characterized in that: The functionality of the epoxy acrylate is 2-4.

5. The LED light source-cured UV spray white primer for pine wood according to claim 2 or 3, characterized in that: The polyurethane acrylate is multifunctional polyurethane acrylate.

6. The LED light source-cured UV spray white primer for pine wood according to claim 1, characterized in that: The acrylic ester monomer includes one or both of 1,6-hexanediol diacrylate and dipropylene glycol diacrylate.

7. The LED light source-cured UV spray white primer for pine wood according to claim 6, characterized in that: The mass ratio of the 1,6-hexanediol diacrylate to the dipropylene glycol diacrylate is (1-3):(2-6).

8. A method for preparing the LED light source-cured UV spray white primer for pine wood according to any one of claims 1 to 7, characterized in that: The following steps are involved: After mixing the base resin and acrylic monomer evenly, add the dispersant, defoamer and leveling agent in turn and mix evenly, then add the photoinitiator and titanium dioxide to adjust the fineness of the paint liquid, and finally add the filler and stir for 10-15 minutes.

9. The method for preparing the LED light source-cured UV spray white primer for pine wood according to claim 8, characterized in that: The fineness of the paint liquid is ≤30 μm.

10. The method for preparing the LED light source-cured UV spray white primer for pine wood according to claim 8, characterized in that: The base resin and the acrylic ester monomer are mixed and stirred at a rotation speed of 600-800 r / min, and the stirring time is 10-15 min.