Box plate anti-cracking treatment process

Abstract

The invention belongs to the technical field of strengthening post-treatment, and particularly relates to an anti-cracking treatment process for a box body plate. The method comprises the steps that firstly, a dry wooden box board with the clean surface is prepared; secondly, a reinforced fiber net is pasted on the surface of the wooden box board; 3, reinforced coating components are prepared; 4, mixing the components of the reinforced coating in a container to obtain the reinforced coating; fifthly, the surface of the wooden box board is coated with the reinforcing coating, the wooden box board and the reinforcing fiber net are covered with the reinforcing coating, and the reinforcing fiber net is attached to the surface of the wooden box board; and 6, heating and curing to obtain a combination of the wooden box board, the reinforced fiber net and the reinforced coating layer. By means of the method, the bending strength of the wooden box board can be improved, meanwhile, the weather resistance, the moisture resistance, the chemical resistance and the mildew-proof and antibacterial performance of the wooden box board are improved, and therefore the application range of the wooden board is widened, and the service life of the wooden board is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of strengthening post-processing, and in particular relates to a process for preventing box body panels from cracking. Background Art

[0002] With the development of social economy and the improvement of people's living standards, wooden products have been widely used in home decoration, packaging and transportation industries due to their natural beauty, environmental protection and health. However, due to the physical properties of wood itself, such as hygroscopicity, thermal expansion and contraction, wooden boards are easily affected by external environmental factors during use, resulting in cracking, deformation and other problems, which seriously affect the quality and service life of the products.

[0003] There are already some methods for wood modification on the market, such as impregnation treatment, chemical modification, etc. For example, there are methods that reduce wood water absorption and cracking by coating the wood surface with paint or waterproof coating, but this method has a single mechanism of action, weak reliability, and mainly changes the surface characteristics of the wood, with limited improvement in the mechanical properties and durability of the wood. For another example, there are schemes that reduce cracking by controlling the moisture content of the wood and waxing it, but this method is complicated to operate in actual applications, has high costs, and does not significantly improve the mechanical properties of the wood. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a process for preventing cracking of box panels. The purpose of the present invention is to comprehensively improve the overall performance of wood, including improving the bending strength of wooden box panels, while improving their weather resistance, moisture resistance, chemical resistance, and mildew and antibacterial properties, thereby broadening the application range of wooden panels and extending their service life.

[0005] The box body plate anti-cracking treatment process provided by the present invention comprises the following steps:

[0006] Step 1: Prepare dry and clean wooden box panels;

[0007] Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board;

[0008] Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer;

[0009] Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating;

[0010] Step 5: coating the reinforcing coating on the surface of the wooden box board, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board;

[0011] Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

[0012] As a further optimization solution for the above-mentioned anti-cracking treatment process of the box body material, the wooden box body material is selected from pine, oak, birch, poplar and fir.

[0013] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body panel, the reinforcing fiber mesh is selected from glass fiber mesh, carbon fiber mesh, aramid fiber mesh, nylon fiber mesh, hemp fiber mesh, and bamboo fiber mesh.

[0014] As a further optimization solution for the above-mentioned anti-cracking treatment process of the box body plate, the enhanced coating includes the following components:

[0015]

[0016]

[0017] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body board, the multifunctional alcohol curing agent is selected from any one or more of the following components: polyoxypropylene glycol, polyoxyethylene glycol, polytetramethylene ether glycol, 1,4-butanediol ester glycol, and polycarbonate diol.

[0018] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body plate, the viscosity regulator is selected from any one or more of the following components: acetone, ethyl acetate, and cyclohexanone.

[0019] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body board, the plasticizer is selected from any one or more of the following components: dibutyl phthalate, tributyl citrate, and dioctyl adipate.

[0020] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body board, the leveling agent is selected from any one or more of the following components: polydimethylsiloxane, polyether block amino silicone oil, and fluorosilicone.

[0021] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body board, the defoaming agent is selected from any one or more of the following components: silicone oil, fatty alcohol polyoxyethylene ether, and polydimethylsiloxane.

[0022] As a further optimization scheme for the above-mentioned anti-cracking treatment process of the box body board, the mildew inhibitor is selected from any one or more of the following components: tributyltin hydrochloride, dodecyldimethylbenzylammonium bromide, imidazolinone, and phenoxyethanol.

[0023] Beneficial Effects

[0024] The present invention successfully prepares a reinforced board with significantly improved flexural strength by pasting a reinforcing fiber mesh on the surface of the wooden box board, coating it with a reinforcing coating containing specific components, and then naturally drying and heat curing it. Compared with untreated boards, the flexural strength of the boards after this treatment process can be increased by up to 305.2%, which not only greatly enhances the mechanical properties of the boards, but also extends their service life, making them more suitable for application scenarios with high strength requirements. In addition, the reinforcing coating formula used in the present invention can also effectively improve the weather resistance, moisture resistance, chemical resistance, and mildew and antibacterial properties of the boards.

[0025] The present invention not only achieves a significant improvement in the mechanical properties of wooden box panels, but also solves the problems of cracking and deformation caused by environmental influences on traditional wooden products, making the treated panels more stable and reliable, and is also conducive to improving the utilization rate of various types of wood in the wooden products industry. DETAILED DESCRIPTION

[0026] The present invention is further illustrated by specific examples below. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0027] In each embodiment, the enhanced coating is applied to the surface of the wooden box board by roller coating. After the roller coating process is completed, the board is placed in an environment with good air circulation conditions to dry naturally for 24 hours to promote the formation of the initial coating film. After that, the board that has completed the initial drying is transferred to an oven with a preset temperature of 80°C for heat curing treatment, and the duration is set to 3 hours. The high temperature causes a cross-linking reaction between the coating molecules, thereby constructing a protective layer with high strength and high density characteristics. After the heat curing process is completed, the oven gradually lowers the temperature until it returns to room temperature to prevent cracks or peeling of the coating caused by sudden cooling. After confirming that the board is completely cooled, take it out of the oven to finally obtain a reinforced wooden box board. The prepared reinforced board can be used for the production of wooden boxes with high strength requirements.

[0028] Example 1

[0029] A box body plate anti-cracking treatment process comprises the following steps:

[0030] Step 1: Prepare dry and clean wooden box panels;

[0031] Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board;

[0032] Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer;

[0033] Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating;

[0034] Step 5: coating the surface of the wooden box board with a reinforcing coating, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board;

[0035] Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

[0036] In this embodiment, the wooden box body board is pine wood.

[0037] In this embodiment, the reinforcing fiber mesh is a glass fiber mesh.

[0038] In this embodiment, the reinforced coating includes the following components:

[0039]

[0040]

[0041] In this embodiment, the multifunctional alcohol curing agent is polyoxypropylene glycol.

[0042] In this embodiment, the viscosity modifier is acetone.

[0043] In this embodiment, the plasticizer is dibutyl phthalate.

[0044] In this embodiment, the leveling agent is polydimethylsiloxane.

[0045] In this embodiment, the defoaming agent is polydimethylsiloxane.

[0046] In this embodiment, the mildew inhibitor is tributyltin hydrochloride.

[0047] Example 2

[0048] A box body plate anti-cracking treatment process comprises the following steps:

[0049] Step 1: Prepare dry and clean wooden box panels;

[0050] Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board;

[0051] Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer;

[0052] Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating;

[0053] Step 5: coating the surface of the wooden box board with a reinforcing coating, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board;

[0054] Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

[0055] In this embodiment, the wooden box body board is pine wood.

[0056] In this embodiment, the reinforcing fiber mesh is a glass fiber mesh.

[0057] In this embodiment, the reinforced coating includes the following components:

[0058]

[0059] In this embodiment, the multifunctional alcohol curing agent is polyoxypropylene glycol.

[0060] In this embodiment, the viscosity modifier is acetone.

[0061] In this embodiment, the plasticizer is dibutyl phthalate.

[0062] In this embodiment, the leveling agent is polydimethylsiloxane.

[0063] In this embodiment, the defoaming agent is polydimethylsiloxane.

[0064] In this embodiment, the mildew inhibitor is tributyltin hydrochloride.

[0065] Example 3

[0066] A box body plate anti-cracking treatment process comprises the following steps:

[0067] Step 1: Prepare dry and clean wooden box panels;

[0068] Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board;

[0069] Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer;

[0070] Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating;

[0071] Step 5: coating the surface of the wooden box board with a reinforcing coating, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board;

[0072] Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

[0073] In this embodiment, the wooden box body board is pine wood.

[0074] In this embodiment, the reinforcing fiber mesh is a glass fiber mesh.

[0075] In this embodiment, the reinforced coating includes the following components:

[0076]

[0077] In this embodiment, the multifunctional alcohol curing agent is polyoxypropylene glycol.

[0078] In this embodiment, the viscosity modifier is acetone.

[0079] In this embodiment, the plasticizer is dibutyl phthalate.

[0080] In this embodiment, the leveling agent is polydimethylsiloxane.

[0081] In this embodiment, the defoaming agent is polydimethylsiloxane.

[0082] In this embodiment, the mildew inhibitor is tributyltin hydrochloride.

[0083] Example 4

[0084] A box body plate anti-cracking treatment process comprises the following steps:

[0085] Step 1: Prepare dry and clean wooden box panels;

[0086] Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board;

[0087] Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer;

[0088] Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating;

[0089] Step 5: coating the surface of the wooden box board with a reinforcing coating, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board;

[0090] Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

[0091] In this embodiment, the wooden box body board is pine wood.

[0092] In this embodiment, the reinforcing fiber mesh is a glass fiber mesh.

[0093] In this embodiment, the reinforced coating includes the following components:

[0094]

[0095]

[0096] In this embodiment, the multifunctional alcohol curing agent is polycarbonate diol.

[0097] In this embodiment, the viscosity modifier is cyclohexanone.

[0098] In this embodiment, the plasticizer is tributyl citrate.

[0099] In this embodiment, the leveling agent is polyether block amino silicone oil.

[0100] In this embodiment, the defoaming agent is silicone oil.

[0101] In this embodiment, the mildew inhibitor is phenoxyethanol.

[0102] Example 5

[0103] A box body plate anti-cracking treatment process comprises the following steps:

[0104] Step 1: Prepare dry and clean wooden box panels;

[0105] Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board;

[0106] Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer;

[0107] Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating;

[0108] Step 5: coating the surface of the wooden box board with a reinforcing coating, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board;

[0109] Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

[0110] In this embodiment, the wooden box body board is pine wood.

[0111] In this embodiment, the reinforcing fiber mesh is a glass fiber mesh.

[0112] In this embodiment, the reinforced coating includes the following components:

[0113]

[0114] In this embodiment, the multifunctional alcohol curing agent is 1,4-butanediol ester diol.

[0115] In this embodiment, the viscosity modifier is cyclohexanone.

[0116] In this embodiment, the plasticizer is dioctyl adipate.

[0117] In this embodiment, the leveling agent is polydimethylsiloxane.

[0118] In this embodiment, the defoaming agent is fatty alcohol polyoxyethylene ether.

[0119] In this embodiment, the mildew inhibitor is dodecyl dimethyl benzyl ammonium bromide.

[0120] In order to evaluate the performance improvement effect of the plate treated with the coating in the above-mentioned embodiment, a bending strength test was conducted. The bending strength test used a universal material testing machine to perform bending loading experiments on untreated and treated plate samples until the samples broke, and recorded the maximum load value of each sample at the moment of breaking. Based on the maximum load of the plate before and after treatment, the improvement ratio of the plate's bending strength was calculated, and the test results are detailed in Table 1.

[0121] Table 1 Performance test results

[0122]

[0123]

[0124] The experimental results show that by using different formulations of reinforcing coatings and combining them with reinforcing fiber mesh to treat wooden box panels, the flexural strength of the panels can be significantly improved. Among them, Example 4 showed the best performance improvement, with a 305.2% increase in flexural strength, thanks to its specific combination of reinforcing coating ingredients, namely, using polycarbonate diol as a multifunctional alcohol curing agent, cyclohexanone as a viscosity regulator, and tributyl citrate as a plasticizer. All examples showed significant performance improvements compared to untreated panels, proving the effectiveness of the treatment process, which can effectively enhance the mechanical properties of wooden box panels and extend their service life, and is suitable for applications requiring high-strength materials.

[0125] The above treatment method not only significantly improves the mechanical strength of the wooden box board, but also further improves the weather resistance, moisture resistance, chemical resistance, mildew and antibacterial properties, surface smoothness and aesthetics of the board.

[0126] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with the technology in this field can understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for preventing cracking of box sheet material, characterized in that: The following steps are involved: Step 1: Prepare dry and clean wooden box panels; Step 2: Paste the reinforcing fiber mesh on the surface of the wooden box board; Step 3: preparing a reinforced coating component including a polyurethane prepolymer, a curing agent, a viscosity modifier, a plasticizer, a leveling agent, a defoaming agent and a mildew preventer; Step 4: Mixing the above-mentioned enhanced coating components in a container to obtain an enhanced coating; Step 5: coating the reinforcing coating on the surface of the wooden box board, so that the reinforcing coating covers the wooden box board and the reinforcing fiber mesh, and the reinforcing fiber mesh is adhered to the surface of the wooden box board; Step 6: After the reinforcing coating on the surface of the wooden box board is initially dried, the reinforcing coating is cured by heating to form a combination of the wooden box board, the reinforcing fiber mesh, and the reinforcing coating layer to obtain a reinforced box board.

2. The box body plate anti-cracking treatment process according to claim 1 is characterized in that: The wooden box body board is selected from pine, oak, birch, poplar and fir.

3. The box body sheet anti-cracking treatment process according to claim 1 is characterized in that: The reinforcing fiber mesh is selected from glass fiber mesh, carbon fiber mesh, aramid fiber mesh, nylon fiber mesh, hemp fiber mesh, and bamboo fiber mesh.

4. The box body sheet anti-cracking treatment process according to any one of claims 1 to 3, characterized in that: The enhanced coating comprises the following components: 1000 parts by mass of MDI polyurethane prepolymer; 600-800 parts by weight of multifunctional alcohol curing agent; 200-500 parts by weight of viscosity modifier; 30-55 parts by weight of plasticizer; Leveling agent 5-10 parts by mass; 3-6 parts by mass of defoamer; 2~5 parts by weight of antifungal agent.

5. The box body plate anti-cracking treatment process according to claim 4 is characterized in that: The multifunctional alcohol curing agent is selected from any one or more of the following components: polyoxypropylene glycol, polyoxyethylene glycol, polytetramethylene ether glycol, 1,4-butanediol ester glycol, and polycarbonate glycol.

6. The box body plate anti-cracking treatment process according to claim 4 is characterized in that: The viscosity modifier is selected from any one or more of the following components: acetone, ethyl acetate, and cyclohexanone.

7. The process for preventing box sheet material from cracking according to claim 4 is characterized in that: The plasticizer is selected from any one or more of the following components: dibutyl phthalate, tributyl citrate, and dioctyl adipate.

8. The process for preventing box body sheet from cracking according to claim 4 is characterized in that: The leveling agent is selected from any one or more of the following components: polydimethylsiloxane, polyether block amino silicone oil, and fluorosilicone.

9. The process for preventing box board materials from cracking according to claim 4, wherein the defoaming agent is selected from any one or more of the following components: silicone oil, fatty alcohol polyoxyethylene ether, and polydimethylsiloxane.

10. The anti-cracking treatment process for box panels according to claim 4, wherein the mildew inhibitor is selected from any one or more of the following components: tributyltin hydrochloride, dodecyldimethylbenzylammonium bromide, imidazolinone, and phenoxyethanol.

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