Temperature-resistant water-based woodworking adhesive and preparation method thereof
By compounding VAE emulsion with a Tg of 0℃ and chloroacetic acid emulsion with a Tg of 20-32℃ into the adhesive, and combining specific additives and controlled mixing process, a high-temperature resistant water-based woodworking adhesive was prepared, which solved the problem of easy softening and failure of the adhesive under high temperature environment and achieved the structural stability of the board at high temperature.
Patent Information
- Application Number
- CN202511535799.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2025-12-16
AI Technical Summary
Existing adhesives are prone to softening and failure under high temperature environments, resulting in structural instability of boards covered with PVC decorative film or PP film in high-temperature scenarios, especially in summer high-temperature environments or outdoor places with direct sunlight, where they are prone to peeling and curling.
A water-based woodworking adhesive with high temperature resistance was prepared by compounding a VAE emulsion with a Tg of 0℃ and a chloroacetic acid emulsion with a Tg of 20-32℃ in a certain proportion and combining it with specific additives. By controlling the mixing speed and vacuum degree, the components were ensured to be fully mixed to form an adhesive with high bonding strength and heat resistance.
It maintains the structural stability of the adhesive under high temperature conditions, preventing the board and film from delaminating and curling at the edges, making it suitable for large-scale production.
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Abstract
Description
Technical Field
[0001] This application relates to the field of adhesive technology, and more specifically, to a heat-resistant water-based woodworking adhesive and its preparation method. Background Technology
[0002] In the fields of furniture manufacturing, interior decoration and construction engineering, due to the scarcity of solid wood resources and size limitations, various types of artificial boards have become the core substrates, among which particleboard and medium-density fiberboard (MDF) are widely used due to their excellent processing performance.
[0003] When such boards are used on visible surfaces such as desktops, doors, windows, and cabinets, PVC decorative film or PP film is usually applied using adhesives to achieve a smooth texture and aesthetically pleasing grain. However, in the high temperatures of summer, the temperature inside board production workshops and logistics transport vehicles often exceeds 40°C. Under these conditions, ordinary adhesives are prone to softening and failure. If boards covered with PVC decorative film or PP film are used in high-temperature environments such as around kitchen stoves or in outdoor locations exposed to direct sunlight, the difference in thermal expansion coefficients between the substrate and the film layer can easily lead to delamination and edge lifting.
[0004] Therefore, there is an urgent need for a heat-resistant adhesive that can maintain the structural stability of boards covered with PVC decorative film or PP film in environments above 40°C. Summary of the Invention
[0005] To improve the heat resistance of adhesives, this application provides a heat-resistant water-based woodworking adhesive and its preparation method.
[0006] In a first aspect, this application provides a heat-resistant water-based woodworking adhesive, employing the following technical solution: A heat-resistant water-based woodworking adhesive, comprising component A and a curing agent; Component A is composed of the following components by weight percentage: VAE emulsion 60-80%; Chlorinated acetate emulsion 10-30%; 3-10% cosolvent; Thickener 0-0.5%; Wetting agent 0-0.3%; Defoamer 0-0.3%; Process water is the margin; The Tg of the VAE emulsion is 0°C; the Tg of the chloroacetic acid emulsion is 20–32°C. The weight ratio of the VAE emulsion to the chloroacetic acid emulsion is 1:(0.2-0.4).
[0007] By adopting the above technical solutions, on the one hand, adhesives with lower Tg (glass transition temperature) are in a highly elastic state at room temperature, which allows for better wetting, penetration, and the generation of strong physical forces (van der Waals forces and mechanical interlocking) with non-polar substrates such as PP (polypropylene), thereby achieving effective adhesion. On the other hand, the paint film formed by high Tg emulsions, even if the temperature rises, as long as it is below its Tg, the polymer chains remain in a frozen "glassy state," and the material remains hard and rigid. Therefore, it is not easy to soften, become sticky, or deform due to heat, resulting in a high heat distortion temperature.
[0008] Therefore, this application achieves a balance between adhesion and heat resistance by compounding a VAE emulsion with a Tg of 0°C and a chloroacetic acid emulsion with a Tg of 20–32°C in the aforementioned weight ratio. Furthermore, the inventors have discovered that while a high Tg results in good heat resistance, it also leads to poor adhesion.
[0009] Preferably, the VAE emulsion includes one or more of Celanese Celvoit 149HV, Celvoit 1418, Wacker Chemie VINNAPAS 706K, Guangxi Wanwei GW-102H, ZhengBang Diversol 540, and Dalian Chemical DA-102.
[0010] Preferably, the VAE emulsion is Celvoit 1418.
[0011] Preferably, the chloroacetic acid emulsion includes one or more of ZhengBang Diversol 503, Dalian Chemical DA-903, DA-905, Sumitomo Chemical Sumikaflex 808HQ, and Sumikaflex 850HQ.
[0012] Preferably, the chloroacetic acid emulsion is ZhengBang Diversol 503.
[0013] Preferably, the wetting and dispersing agent is one or more of BYK-349, BYK-345, BYK-346, BYK-4500, and BYK-4510.
[0014] Preferably, the wetting and dispersing agent is BYK-349.
[0015] Preferably, the cosolvent is triacetin.
[0016] Preferably, the triacetin is dioctyl terephthalate and / or tributyl acetyl citrate.
[0017] Preferably, the thickener is a hydrophobically modified polyurethane or an acrylic copolymer.
[0018] Preferably, the thickener is one or more of Rohm and Haas RM-2020, Hemings Deqian WT-102, Hemings Deqian WT-105, Hemings Deqian WT-202, Hemings Deqian WT-203, and Hemings Deqian WT-204.
[0019] Preferably, the defoamer is a white mineral oil-based defoamer.
[0020] Preferably, the heat-resistant water-based woodworking adhesive has a solid content of 51.5–53.9 wt% and a viscosity of 20,000–30,000 cps at 10 rpm and 27°C.
[0021] By adopting the above technical solution, the viscosity range of the heat-resistant water-based woodworking adhesive is 20,000 to 30,000 cps. When finally used for gluing on a roller gluing machine, this viscosity is suitable for gluing and does not cause glue to splatter.
[0022] Secondly, this application provides a method for preparing a heat-resistant water-based woodworking adhesive, using the following technical solution: A method for preparing a heat-resistant water-based woodworking adhesive includes the following steps: Step 1: First, mix the VAE emulsion, chloroacetic acid emulsion, wetting and dispersing agent and defoamer accounting for 30-50% of the total mass of defoamer. Then, stir and mix for 20-30 minutes at a speed of 30-60 r / min. Finally, add the cosolvent and stir and mix for 20-30 minutes at 40-60 r / min to obtain the mixture. Step 2: First, adjust the mixing speed to 20-60 r / min, add the remaining defoamer and process water, then evacuate to a vacuum degree of -0.09 MPa ± 0.01 MPa, and maintain for 30-60 min. When the viscosity reaches 20000-30000 cps, the heat-resistant water-based woodworking adhesive is obtained.
[0023] By adopting the above technical solution, the raw materials are mixed in steps, and the mixing speed and vacuum are controlled to ensure that the raw materials are fully mixed. The resulting adhesive has high stability and good temperature resistance.
[0024] In summary, this application has the following beneficial effects: 1. Since this application uses VAE emulsion with Tg at 0℃ and chloroacetic acid emulsion with Tg at 20~32℃ in a certain weight ratio, by using a small amount of chloroacetic acid emulsion, the bonding and heat resistance properties can be balanced, and a water-based woodworking adhesive with high bonding strength and heat resistance can be obtained. 2. The preparation method of this application is simple to operate and suitable for large-scale production. Detailed Implementation
[0025] The present application will be further described in detail below with reference to the embodiments. The viscosity, solid content, and pH value of the heat-resistant water-based woodworking adhesive prepared in the embodiments of this application and the adhesive prepared in the comparative example were tested using the following methods:
[0026] Viscosity testing: Refer to GB / T 2794-2013 standard; Solid content testing: Refer to GB / T 2793-1995 standard; pH value testing: Refer to GB / T 14518-1993 standard. Example Example 1
[0027] A heat-resistant water-based woodworking adhesive, the components and their corresponding weights (kg) are shown below.
[0028]
[0029] The preparation method of the above-mentioned heat-resistant water-based woodworking adhesive includes the following steps: Step 1: First, mix the VAE emulsion, chloroacetic acid emulsion, wetting and dispersing agent and defoamer accounting for 30-50% of the total mass of defoamer (35% in the example of this application), then stir and mix for 20 minutes at a speed of 30 r / min, and finally add the cosolvent and stir and mix for 20 minutes at 40 r / min to obtain the mixture; Step 2: First, adjust the mixing speed to 20 r / min, then evacuate to a vacuum degree of -0.09 MPa ± 0.01 MPa, maintain for 120 min, finally add the remaining defoamer and process water, stir and mix at 30 r / min for 20 min, and after the viscosity is found to be qualified, the heat-resistant water-based woodworking adhesive is obtained.
[0030] Examples 2-3 A heat-resistant water-based woodworking adhesive, which differs from Example 1 in that the components and their corresponding weights (kg) are as follows.
[0031]
[0032] The viscosity, solid content, and pH value of the heat-resistant water-based woodworking adhesives prepared in Examples 2 and 3 were tested, and the test results are shown in the table below.
[0033] Example 4
[0034] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the VAE emulsion is ZhengBang Diversol 540. Example 5
[0035] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the VAE emulsion is Celanese Celvoit 1418.
[0036] The viscosity, solid content, and pH value of the heat-resistant water-based woodworking adhesives prepared in Examples 4 and 5 were tested, and the test results are shown in the table below.
[0037]
[0038] Data analysis of the table above shows that VAE emulsions produced by different manufacturers have similar Tg and chemical structures, and under the same formula, the physical properties of the products are not significantly different. Example 6
[0039] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the chloroacetic acid emulsion is ZhengBang Diversol 503. Example 7
[0040] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the chloroacetic acid emulsion is Dalian Chemical DA-903.
[0041] The viscosity, solid content, and pH value of the heat-resistant water-based woodworking adhesives prepared in Examples 6 and 7 were tested, and the test results are shown in the table below.
[0042] Example 8
[0043] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the wetting and dispersing agent is BYK-349.
[0044] The viscosity, solid content, and pH value of the heat-resistant water-based woodworking adhesive prepared in Example 8 were tested, and the test results are shown in the table below.
[0045] Example 9
[0046] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the weight ratio of VAE emulsion, chloroacetic acid emulsion and wetting and dispersing agent is 65:25:1. Example 10
[0047] A heat-resistant water-based woodworking adhesive, which differs from Example 3 in that the weight ratio of VAE emulsion, chloroacetic acid emulsion and wetting and dispersing agent is 75:15:1.
[0048] The viscosity, solid content, and pH value of the heat-resistant water-based woodworking adhesives prepared in Examples 9 and 10 were tested, and the test results are shown in the table below.
[0049] Comparative Examples 1-2
[0050] An adhesive, which differs from Example 3 in that the weights of the VAE emulsion and the chloroacetic acid emulsion are shown in the table below.
[0051]
[0052] The viscosity, solid content, and pH value of the adhesives prepared in Comparative Examples 1 and 2 were tested, and the results are shown in the table below.
[0053] Application examples Application Example 1
[0054] A composite board includes a substrate, the surface of which is covered with a PVC film by an adhesive.
[0055] In the application example of this application, the substrate is a general-purpose medium-density fiberboard; The adhesive is a mixture of the heat-resistant water-based woodworking adhesive prepared in Example 1 and polymeric MDI (the brand can be Wanhua PM200, BASF M20S or Huntsman 5005, and in this application example it is Wanhua PM200) at a weight ratio of 100:10.
[0056] PVC film, with a thickness of 0.08-0.2mm.
[0057] The preparation method of the above-mentioned composite board includes the following steps: After coating the substrate surface with an adhesive with a thickness of 80μm, a PVC film is then attached, followed by pressing and curing to obtain a composite board.
[0058] Application Examples 2-12 A composite board differs from Application Example 1 in that the adhesive is prepared from the examples or comparative examples in the table below.
[0059]
[0060] The composite panels prepared using Examples 1-12 were tested for temperature resistance and high-temperature stability. The testing methods are as follows: Temperature resistance test: A 500g object is hung on the composite board and then placed in a 60℃ environment for 24 hours. The peel length of the object (the total length of the object is 24cm) is then measured.
[0061] High-temperature stability test: The composite board is placed in a 60℃ environment for 72 hours to test whether the substrate and PVC film show signs of delamination, bubbling or deformation.
[0062] Test results:
[0063] Data analysis of the table above shows that the peel length of the composite boards used in Examples 1, 2, and 3 gradually decreases when subjected to a load in a 60°C environment. This indicates that using a small amount of chloroacetic acid emulsion, wetting and dispersing agent, and VAE emulsion in the total raw materials for preparing the heat-resistant water-based wood adhesive of this application can improve the heat resistance of the adhesive.
[0064] In particular, as can be seen from application examples 3, 9, and 10, in the total raw materials for preparing the heat-resistant water-based woodworking adhesive of this application, the weight ratio of VAE emulsion, chloroacetic acid emulsion, and wetting and dispersing agent is 1:(0.2-0.4):0.015, which can improve the heat resistance of the heat-resistant water-based woodworking adhesive.
[0065] Compared to Application Example 3, the composite boards in Application Examples 4 and 5 showed a gradual increase in the peel length of the weighted object in a 60°C environment. This indicates that the VAE emulsion Celanese Celvoit 149HV in the total raw materials for preparing the heat-resistant water-based wood adhesive of this application can improve the temperature resistance of the heat-resistant water-based wood adhesive.
[0066] Compared to Application Example 3, the composite boards in Application Examples 7 and 6 showed a gradual increase in the peel length of the weighted object in a 60°C environment. This indicates that the chloroacetic acid emulsion in the total raw materials for preparing the heat-resistant water-based wood adhesive of this application, namely ZhengBang Diversol 503, can improve the temperature resistance of the heat-resistant water-based wood adhesive.
[0067] Compared to Application Example 3, the composite board in Application Example 8 showed a significant increase in the peel length of the weighted object in a 60°C environment. This indicates that the wetting and dispersing agent BYK-346 in the total raw materials for preparing the heat-resistant water-based woodworking adhesive of this application can improve the temperature resistance of the adhesive.
[0068] Compared to Application Example 3, although the peel length of the composite board in Application Example 11 under a heavy load increased significantly in a 60°C environment, after the composite board was placed in a 60°C environment for 72 hours, the substrate and PVC film showed signs of delamination, blistering, or deformation. This indicates that the weight ratio of VAE emulsion, chloroacetic acid emulsion, and wetting and dispersing agent in the total raw materials for preparing the heat-resistant water-based woodworking adhesive of this application is 1:0.286:0.014, which can improve the high-temperature stability of the heat-resistant water-based woodworking adhesive.
[0069] Compared to Application Example 3, although the peel length of the composite board in Application Example 12 under a heavy load increased significantly in a 60°C environment, the substrate and PVC film showed signs of delamination, blistering, or deformation after being continuously placed in a 60°C environment for 72 hours. This indicates that using a blend of VAE emulsion and chloroacetic acid emulsion in the total raw materials for preparing the heat-resistant water-based woodworking adhesive of this application can improve the high-temperature stability of the adhesive.
[0070] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A water-based woodworking adhesive resistant to high temperatures, characterized in that, Includes component A; Component A comprises the following components by weight percentage composition: VAE emulsion 60-80%; Chlorinated acetate emulsion 10-30%; 3-10% cosolvent; Thickener 0-0.5%; Wetting agent 0-0.3%; Defoamer 0-0.3%; Process water is the margin; The Tg of the VAE emulsion is 0°C; the Tg of the chloroacetic acid emulsion is 20–32°C. The weight ratio of the VAE emulsion to the chloroacetic acid emulsion is 1:(0.2-0.4).
2. The heat-resistant water-based woodworking adhesive according to claim 1, characterized in that, The VAE emulsion includes one or more of Celanese Celvoit 149HV, Celvoit 1418, Wacker Chemie VINNAPAS 706K, Guangxi Wanwei GW-102H, ZhengBang Diversol 540, and Dalian Chemical DA-102.
3. The water-resistant woodworking adhesive according to claim 2, characterized in that, The VAE emulsion is Celvoit 1418.
4. The heat-resistant water-based woodworking adhesive according to claim 1, characterized in that, The chloroacetic acid emulsion includes one or more of ZhengBang Diversol 503, Dalian Chemical DA-903, DA-905, Sumitomo Chemical Sumikaflex 808HQ, and Sumikaflex 850HQ.
5. The water-based heat-resistant woodworking adhesive according to claim 4, characterized in that, The chloroacetic acid emulsion is ZhengBang Diversol 503.
6. The heat-resistant water-based woodworking adhesive according to claim 1, characterized in that, The wetting and dispersing agent is one or more of BYK-349, BYK-345, BYK-346, BYK-4500, and BYK-4510.
7. The water-resistant woodworking adhesive according to claim 6, characterized in that, The wetting and dispersing agent is BYK-349.
8. The water-resistant woodworking adhesive according to claim 1, characterized in that, The heat-resistant water-based woodworking adhesive has a solid content of 51.5–53.9 wt% and a viscosity of 20,000–30,000 cps at 10 rpm and 27°C.
9. A method for preparing the heat-resistant water-based woodworking adhesive according to any one of claims 1 to 8, characterized in that, Includes the following steps: Step 1: First, mix the VAE emulsion, chloroacetic acid emulsion, wetting and dispersing agent and defoamer accounting for 30-50% of the total mass of defoamer. Then, stir and mix for 20-30 minutes at a speed of 30-60 r / min. Finally, add the cosolvent and stir and mix for 20-30 minutes at a speed of 40-60 r / min to obtain the mixture. Step 2: First, adjust the mixing speed to 20-60 r / min, add the remaining defoamer and process water, then evacuate to a vacuum degree of -0.09 MPa ± 0.01 MPa, and maintain for 30-60 min. When the viscosity reaches 20000-30000 cps, the heat-resistant water-based woodworking adhesive is obtained.