Waterproofing agent for wood floor edge sealing, preparation and application

Abstract

The application discloses a waterproof agent for wood floor edge sealing, preparation and application. The waterproof agent for wood floor edge sealing is prepared from the following raw materials in parts by mass: phenol modified melamine resin 90-95 parts and curing agent 5-10 parts, with a total of 100 parts. The waterproof agent for wood floor edge sealing is used for artificial board edge sealing treatment, which is beneficial to improving the waterproof performance of the artificial board, breaks through the limit value of the water absorption thickness expansion rate of the traditional waterproof agent for wood board after 24 hours, and effectively solves the problems of size change, bulging and edge turning of the artificial board caused by moisture absorption or water absorption around the artificial board. Therefore, the waterproof agent for wood floor edge sealing can be widely applied to artificial board manufacturing.

Description

Technical Field

[0001] This invention relates to the field of engineered wood products manufacturing technology. More specifically, it relates to a waterproofing agent for sealing the edges of wood flooring, its preparation, and its application. Background Technology

[0002] The expansion and contraction due to moisture absorption in wood materials and their products, such as timber, fiberboard, particleboard, plywood, and wood flooring, is a major technical challenge affecting their use. During use, humid environments cause wood flooring to expand in length, width, and thickness. If expansion joints are not properly fitted, the flooring will bulge and the edges of each plank will curl up. In dry seasons, the flooring shrinks, creating gaps between planks, affecting aesthetics and allowing dust and other debris to easily enter. The water absorption thickness expansion rate and length expansion rate are among the main technical indicators for evaluating wood flooring.

[0003] The top and bottom surfaces of wooden flooring are finished with paint or melamine-impregnated paper, providing both decorative effect and stain and water resistance. To protect the wood around the floorboards and reduce dimensional changes caused by moisture absorption, molten paraffin or paraffin emulsion is currently applied around the perimeter, improving the dimensional stability of the flooring to some extent. The waterproofing agent primarily uses 58# to 62# paraffin wax, with added beeswax, white oil, etc. The maximum 24-hour swelling rate after applying the waterproofing agent is approximately 6%, and the contact angle of the waterproof layer is 80–90°.

[0004] CN201910747372.3 discloses a waterproof wax for flooring and its preparation method, made from the following raw materials in parts by weight: 110-130 parts fully refined paraffin wax, 115-125 parts palm wax, 118-122 parts hydrogenated oil, 22-26 parts Daqing No. 58 semi-refined paraffin wax, 58-63 parts loose wax, 11-13 parts water, 14-17 parts polyether wax, 9-12 parts polychlorotrifluoroethylene wax, and 18-21 parts silica. No waterproofing effect on the floor after using this waterproof wax is provided. CN201611116344.4 discloses a wood flooring edge sealant and its preparation method, comprising the following components: 50%-80% paraffin wax, 5%-25% microcrystalline wax, 5%-10% alkyd resin, and 10%-20% thixotropic sulfonate. The edge sealant is resistant to high-temperature water immersion and low-temperature environmental changes, achieving a long-lasting waterproofing effect under normal use. CN201010219782.X discloses an edge sealant for reinforced flooring, its preparation method, and its application. The edge sealant comprises the following components: 2-6 parts wax, 20-40 parts resin, 20-40 parts ester solvent, and 20-50 parts alkane solvent. The edge sealant is uniformly sprayed onto the grooves on the side of the reinforced flooring at a dosage of 100-150 g / m². The 24-hour water absorption thickness expansion rate of the flooring is 1.77-8.26%.

[0005] Although wax can be used as a waterproofing agent for wood materials, employing a physical sealing mechanism, the sealing film of paraffin wax is easily damaged and rendered ineffective during use due to environmental factors such as temperature, humidity, and external forces, resulting in reduced waterproofing performance. In addition, floors are highly susceptible to mold and decay in humid environments, a common problem in rainy and humid areas that severely restricts the use of wood flooring products. Summary of the Invention

[0006] To address the aforementioned problems, the first objective of this invention is to provide a waterproofing agent for sealing the edges of wooden floors. This waterproofing agent for sealing the edges of wooden floors has long-lasting waterproofing and excellent waterproofing capabilities. After soaking for 24 hours, the water absorption thickness expansion rate at the edge is ≤5%, and the water absorption thickness expansion rate at the center point is ≤2%, breaking through the limit value of water absorption thickness expansion rate after 24 hours for traditional waterproofing agents for wooden boards.

[0007] A second objective of this invention is to provide a method for preparing a waterproofing agent for sealing the edges of wooden flooring as described above.

[0008] A third objective of this invention is to provide an application of the waterproofing agent for wood flooring edge sealing as described above in the preparation of engineered wood panels.

[0009] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0010] This invention discloses a waterproofing agent for sealing the edges of wooden floors, which is composed of the following raw materials in parts by weight:

[0011] The mixture comprises 90-95 parts of phenol-modified melamine resin and 5-10 parts of curing agent, totaling 100 parts. For example, the waterproofing agent for sealing the edges of wooden floors can be 90 parts of phenol-modified melamine resin and 10 parts of curing agent, 91 parts of phenol-modified melamine resin and 9 parts of curing agent, 92 parts of phenol-modified melamine resin and 8 parts of curing agent, 93 parts of phenol-modified melamine resin and 7 parts of curing agent, 94 parts of phenol-modified melamine resin and 6 parts of curing agent, 95 parts of phenol-modified melamine resin and 5 parts of curing agent, etc.

[0012] Currently, although melamine-formaldehyde resin is widely used as an adhesive for wood materials, providing excellent bonding between wood materials, its waterproofing performance is poor. Furthermore, the dimensional changes caused by moisture absorption or water absorption by wooden floors, and the difficulty of traditional edge banding agents in achieving the expected expansion rate due to water absorption, leading to problems such as bulging and edge curling, urgently need to be addressed. Through extensive experimental research, the inventors modified melamine-formaldehyde resin and used the newly obtained compound in the preparation of edge banding agents, resulting in a simple, easy-to-use, highly waterproof, and durable waterproofing agent for wooden floor edges. This waterproofing agent for wooden floor edges consists of two raw materials: phenol-modified melamine resin and a curing agent. The phenol-modified melamine resin... The amine resin is prepared using a specific method, and through the control of each raw material and the design of the process steps, the obtained phenol-modified melamine resin plays an important role in the manufacturing process of the waterproofing agent. The final waterproofing agent for wood flooring edge sealing, after being used for edge sealing of wood flooring, results in an edge water absorption thickness expansion rate of ≤4% after 24 hours of immersion in water, and a center point water absorption thickness expansion rate of ≤0.5% after 24 hours. This breaks through the limit value of water absorption thickness expansion rate of traditional wood flooring waterproofing agents after 24 hours (the limit value of edge water absorption thickness expansion rate after 24 hours in the existing technology is 6%, and the limit value of center point water absorption thickness expansion rate after 24 hours is 3%). It has a significant improvement over the existing technology and can effectively reduce problems such as dimensional changes, bulging, and edge curling caused by moisture or water absorption around the edges of wood materials.

[0013] Furthermore, the phenol-modified melamine resin is obtained using the following preparation process:

[0014] (1) Add 4.5-5.5 moles of water and 16-18% polyvinyl alcohol by mass of water to the reactor, start the stirring device, heat to 90-95℃, and stir until the polyvinyl alcohol is completely hydrolyzed.

[0015] (2) Cool down to 55-65℃, add 0.02-0.04 mol of phosphoric acid, and keep for 15-30 minutes;

[0016] (3) Add 1.0 mol of phenol and keep for 10-20 minutes;

[0017] (4) Add 0.65-0.95 mol of paraformaldehyde, heat to 92-98℃, and maintain for 45-90 minutes;

[0018] (5) Cool down to 70-75℃ and adjust the pH to 9.0-10.0 with caustic soda;

[0019] (6) Add 0.80-1.50 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0020] (7) Add 0.1-1.0 moles of melamine, control the reaction temperature at 85-95℃, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.2-1.5 moles of butanol and maintain for 15-45 minutes;

[0021] (8) Add 0.10-0.50 moles of urea, thiourea or their derivatives, and react at 85-95℃ for 30-60 minutes to obtain the product.

[0022] Furthermore, the degree of alcoholysis of the polyvinyl alcohol is 85%, and the average degree of polymerization is 750-2000.

[0023] Furthermore, the urea, thiourea or its derivatives include, but are not limited to, one or more combinations of urea, thiourea, thiourea dioxide, 1,2-ethylidene thiourea, ethylamine thiourea, p-aminobenzenesulfonamide, acetamide or trimethylbutyramide.

[0024] This invention utilizes an acid-base process to prepare phenol-modified melamine resin using polyvinyl alcohol (PVA) toughening. Under acidic conditions and a formaldehyde / phenol molar ratio <1.0, PVA, phenol, and formaldehyde are first reacted according to Formula 1 to generate PVA-formaldehyde-modified melamine resin. Then, in an alkaline environment, formaldehyde and melamine are added, and PVA-toughened melamine resin is generated according to Formula 2. Finally, butanol is added to etherify the hydroxymethyl group, preparing a waterproof resin for wood flooring. Urea or thiourea or its derivatives are added to neutralize any unreacted free formaldehyde.

[0025] In the above process, polyvinyl alcohol and phenol react with formaldehyde under acidic conditions to generate polyvinyl alcohol-formaldehyde modified linear phenolic resin. The introduction of polyvinyl alcohol increases the distance between benzene rings, improves the toughness of the resin, and reduces the reduction in waterproof and adhesive properties caused by brittle fracture during use. In addition, as shown in Formula 1, the introduction of polyvinyl alcohol transforms the linear phenolic resin generated under acidic conditions into a network structure, which is conducive to the formation of interweaving between resins and achieves full coverage of the protected material. Then, the reaction system is adjusted to alkaline conditions, formaldehyde is added, and melamine is added to further react and increase the network structure and molecular chains of the resin, as shown in Formula 2. The resin finally synthesized by this invention can form a reinforced and waterproof protective film with the curing agent under existing production process conditions, achieving the effect of protecting wood materials. The addition of butanol serves two purposes: firstly, it partially etherifies hydroxymethyl groups, reduces the number of polar groups such as hydroxymethyl groups, and secondly, it acts as a solvent for the antifungal agent IPBC.

[0026] Formula 1:

[0027]

[0028] Formula 2:

[0029]

[0030] In one specific implementation, in order to better adapt to the humid environment of the south, especially during the plum rain season, and to prevent the wooden flooring from becoming moldy, thus affecting normal use and causing environmental pollution, those skilled in the art can introduce a small amount of antifungal agent during the preparation of phenol-modified melamine resin to control the occurrence of mold growth. The following describes one method of introducing an antifungal agent, including the following steps:

[0031] (1) Add 4.5-5.5 moles of water and 16-18% polyvinyl alcohol by mass of water to the reactor, start the stirring device, heat to 90-95℃, and stir until the polyvinyl alcohol is completely hydrolyzed.

[0032] (2) Cool down to 55-65℃, add 0.02-0.04 mol of phosphoric acid, and keep for 15-30 minutes;

[0033] (3) Add 1.0 mol of phenol and keep for 10-20 minutes;

[0034] (4) Add 0.65-0.95 mol of paraformaldehyde, heat to 92-98℃, and maintain for 45-90 minutes;

[0035] (5) Cool down to 70-75℃ and adjust the pH to 9.0-10.0 with caustic soda;

[0036] (6) Add 0.80-1.50 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0037] (7) Add 0.1-1.0 moles of melamine, control the reaction temperature at 85-95℃, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.2-1.5 moles of butanol and maintain for 15-45 minutes;

[0038] (8) Add 0.10-0.50 moles of urea, thiourea or their derivatives, and react at 85-95℃ for 30-60 minutes to obtain phenol-modified melamine resin;

[0039] (9) Cool down to below 50°C and add 0.10-0.50% of the mass of phenol-modified melamine resin IPBC to improve the anti-mildew properties of phenol-modified melamine resin.

[0040] Those skilled in the art will understand that the antifungal agent and the method of introducing the antifungal agent used in this invention are not special cases. The type of antifungal agent and the method of introducing the antifungal agent can be selectively replaced based on experience or conventional technology, and these are all within the scope of protection of this application. In addition, it should be noted that the addition or absence of the antifungal agent only affects the antifungal effect and has little impact on the waterproof performance of the waterproofing agent.

[0041] Furthermore, the curing agent can rapidly undergo a cross-linking reaction with phenol-modified melamine resin, imparting waterproof effect and improving strength, including but not limited to one or more combinations of toluene diisocyanate, isophorone diisocyanate, or diphenylmethane diisocyanate.

[0042] To achieve the second objective mentioned above, the technical solution provided by this invention is as follows:

[0043] This invention discloses a method for preparing a waterproofing agent for sealing the edges of wooden flooring as described above, comprising the following preparation steps:

[0044] Add phenol-modified melamine resin and curing agent to the reactor, heat until melted, and stir evenly.

[0045] To achieve the third objective mentioned above, the technical solution provided by this invention is as follows:

[0046] This invention discloses the application of the waterproofing agent for sealing wooden flooring as described above in the preparation of engineered wood panels.

[0047] Furthermore, the wood flooring edge banding is sealed by applying a waterproofing agent to the sides of the engineered wood board using a roller coating or spraying method.

[0048] Furthermore, the amount of waterproofing agent used for sealing the edges of the wooden floor is 100-150g per square meter of engineered wood.

[0049] The beneficial effects of this invention are as follows:

[0050] This invention discloses a waterproofing agent for sealing the edges of wooden floors, its preparation, and its application. This waterproofing agent for sealing the edges of wooden floors has a simple formula, is easy to use, and possesses excellent waterproofing performance and a long-lasting waterproofing effect. After being used for edge sealing of wooden floors, the water absorption thickness expansion rate of the wooden floor after 24 hours of immersion in water is ≤4%, and the water absorption thickness expansion rate at the center point is ≤0.5% after 24 hours. This breaks through the limit value of water absorption thickness expansion rate of traditional wood flooring waterproofing agents after 24 hours, and represents a significant improvement over existing technologies. It can effectively reduce problems such as dimensional changes, bulging, and edge curling caused by moisture or water absorption around the edges of wooden materials. Detailed Implementation

[0051] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0052] Example 1

[0053] 1. Preparation of phenol-modified melamine resin:

[0054] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0055] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0056] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0057] (4) Add 0.67 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0058] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0059] (6) Add 0.83 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0060] (7) Add 0.16 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0061] (8) Add 0.33 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0062] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0063] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0064] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0065] 3. Edge sealing application:

[0066] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0067] Example 2

[0068] 1. Preparation of phenol-modified melamine resin:

[0069] (1) Add 4.72 moles of water and 15 parts by mass of polyvinyl alcohol with a water mass percentage of 17.65% to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0070] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0071] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0072] (4) Add 0.67 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0073] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0074] (6) Add 0.83 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0075] (7) Add 0.24 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0076] (8) Add 0.26 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0077] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0078] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0079] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0080] 3. Edge sealing application:

[0081] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0082] Example 3

[0083] 1. Preparation of phenol-modified melamine resin:

[0084] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0085] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0086] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0087] (4) Add 0.67 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0088] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0089] (6) Add 0.83 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0090] (7) Add 0.32 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0091] (8) Add 0.17 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0092] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0093] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0094] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0095] 3. Edge sealing application:

[0096] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0097] Example 4

[0098] 1. Preparation of phenol-modified melamine resin:

[0099] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0100] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0101] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0102] (4) Add 0.80 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0103] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0104] (6) Add 0.97 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0105] (7) Add 0.36 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0106] (8) Add 0.39 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0107] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0108] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0109] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0110] 3. Edge sealing application:

[0111] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0112] Example 5

[0113] 1. Preparation of phenol-modified melamine resin:

[0114] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0115] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0116] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0117] (4) Add 0.80 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0118] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0119] (6) Add 0.97 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0120] (7) Add 0.48 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0121] (8) Add 0.26 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0122] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0123] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0124] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0125] 3. Edge sealing application:

[0126] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0127] Example 6

[0128] 1. Preparation of phenol-modified melamine resin:

[0129] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0130] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0131] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0132] (4) Add 0.80 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0133] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0134] (6) Add 0.97 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0135] (7) Add 0.59 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0136] (8) Add 0.17 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0137] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0138] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0139] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0140] 3. Edge sealing application:

[0141] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0142] Example 7

[0143] 1. Preparation of phenol-modified melamine resin:

[0144] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0145] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0146] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0147] (4) Add 0.93 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0148] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0149] (6) Add 1.07 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0150] (7) Add 0.52 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0151] (8) Add 0.46 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0152] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0153] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0154] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0155] 3. Edge sealing application:

[0156] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0157] Example 8

[0158] 1. Preparation of phenol-modified melamine resin:

[0159] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0160] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0161] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0162] (4) Add 0.93 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0163] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0164] (6) Add 1.07 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0165] (7) Add 0.63 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0166] (8) Add 0.37 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0167] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0168] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0169] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0170] 3. Edge sealing application:

[0171] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0172] Example 9

[0173] 1. Preparation of phenol-modified melamine resin:

[0174] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0175] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0176] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0177] (4) Add 0.93 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0178] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0179] (6) Add 1.07 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0180] (7) Add 0.79 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and keep for 30 minutes;

[0181] (8) Add 0.20 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0182] (9) Cool down to below 50°C and add 0.30 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0183] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0184] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0185] 3. Edge sealing application:

[0186] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0187] Example 10

[0188] 1. Preparation of phenol-modified melamine resin:

[0189] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0190] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0191] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0192] (4) Add 0.67 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0193] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0194] (6) Add 0.83 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0195] (7) Add 0.16 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0196] (8) Add 0.33 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0197] (9) Cool down to below 50°C and add 1.00 parts by weight of IPBC of phenol-modified melamine resin to obtain phenol-modified melamine resin with anti-mildew properties.

[0198] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0199] Take 95 parts by weight of phenol-modified melamine resin with anti-mildew properties, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0200] 3. Edge sealing application:

[0201] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0202] Example 11

[0203] 1. Preparation of phenol-modified melamine resin:

[0204] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0205] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0206] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0207] (4) Add 0.67 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0208] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0209] (6) Add 0.83 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0210] (7) Add 0.16 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0211] (8) Add 0.33 moles of thiourea and maintain the reaction at 85-95°C for 45 minutes to obtain phenol-modified melamine resin.

[0212] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0213] Take 95 parts by weight of phenol-modified melamine resin, add 5 parts by weight of isocyanate TDI curing agent, and stir evenly to obtain the product.

[0214] 3. Edge sealing application:

[0215] Apply a waterproofing agent to the sides and edges of the wooden flooring using a roller or spray method, with a coating amount of 120 grams per square meter of flooring.

[0216] Comparative Example 1

[0217] 1. Preparation of phenol-modified melamine resin:

[0218] (1) Add 4.72 moles of water and 17.65% polyvinyl alcohol by mass to the reactor, start the stirring device, heat to 90-95°C, and maintain for 30 minutes until the polyvinyl alcohol is completely hydrolyzed.

[0219] (2) Cool down to 55-65℃, add 0.03 mol of phosphoric acid, and keep for 15 minutes;

[0220] (3) Add 1.0 mol of phenol and keep for 15 minutes;

[0221] (4) Add 0.67 moles of paraformaldehyde, heat to 92-98°C, and maintain for 90 minutes;

[0222] (5) Cool down to 70-75℃ and adjust the pH to 9.5 with caustic soda;

[0223] (6) Add 0.83 moles of paraformaldehyde to maintain the pH of the reaction solution at no less than 8.5;

[0224] (7) Add 0.16 moles of melamine, control the reaction temperature at 85-95°C, test the water miscibility of the resin, and when the water miscibility is 1-2 times, add 1.35 moles of butanol and maintain for 30 minutes;

[0225] (8) Add 0.33 mol of thiourea and maintain the reaction at 85-95℃ for 45 minutes to obtain phenol-modified melamine resin;

[0226] (9) Cool down to below 50°C, add 0.30 parts by weight of phenol-modified melamine resin to obtain IPBC with

[0227] Phenol-modified melamine resin with anti-mildew properties.

[0228] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0229] Take 99 parts by weight of phenol-modified melamine resin, add 1 part by weight of ammonium chloride curing agent, and stir evenly to obtain the product.

[0230] 3. Edge sealing application:

[0231] Apply phenol-modified melamine resin with anti-mildew properties to the sides and edges of the floor using roller coating or spraying. Seal the edges by applying 200 grams of resin per square meter of flooring. Then heat at 115°C for 3 minutes to cure the resin.

[0232] Comparative Example 2

[0233] 1. Use TDI isocyanate directly as a waterproofing agent.

[0234] 2. Edge sealing application:

[0235] Apply TDI isocyanate to the sides and edges of the flooring using roller coating or spraying, sealing the edges. Apply 60 grams of TDI per square meter of flooring, then heat at 130°C for 5 minutes to cure the resin.

[0236] Comparative Example 3

[0237] 1. The commercially available phenolic resin for plywood is produced by Jinyu Microscopic (Cangzhou) Chemical Co., Ltd., with a solid content of 45.0±1.0% and a viscosity of 32cp.s.

[0238] 2. Edge sealing application:

[0239] Apply phenolic resin to the sides and edges of the flooring using roller coating or spraying. Seal the edges with 200 grams of resin per square meter of flooring. Then heat at 130°C for 5 minutes to cure the resin.

[0240] Comparative Example 4

[0241] 1. The commercially available melamine-modified urea-formaldehyde resin for plywood is produced by Jinyu Microscopic (Cangzhou) Chemical Co., Ltd., with a solid content of 50.0±1.0% and a viscosity of 28cp.s.

[0242] 2. Preparation of waterproofing agent for edge banding of wooden flooring:

[0243] Take 99 parts by weight of melamine-modified urea-formaldehyde resin, add 1 part by weight of ammonium chloride curing agent, and stir evenly to obtain the product.

[0244] 3. Edge sealing application:

[0245] Apply phenolic resin to the sides and edges of the flooring using roller coating or spraying. Seal the edges with 200 grams of resin per square meter of flooring. Then heat at 115°C for 3 minutes to cure the resin.

[0246] Comparative Example 5

[0247] The waterproof floor wax is made from the following raw materials in parts by weight: 120 parts fully refined paraffin wax, 119 parts palm wax, 120 parts hydrogenated oil, 24 parts Daqing No. 58 semi-refined paraffin wax, 60 parts loose wax, 12.8 parts water, 15.6 parts polyether wax, 10.5 parts polychlorotrifluoroethylene wax, and 19.5 parts silica. The preparation process is as follows: The fully refined paraffin wax, palm wax, hydrogenated oil, and water are mixed and melted until homogeneous to obtain a first mixture; the Daqing No. 58 semi-refined paraffin wax and loose wax are mixed and melted until homogeneous to obtain a second mixture; the polyether wax, polychlorotrifluoroethylene wax, silica, and polyethylene wax are mixed and melted until homogeneous to obtain a third mixture; the first, second, and third mixtures are added to a mixing tank, and tetradecylamine polyoxyethylene ether is added and mixed until homogeneous to obtain the waterproof floor wax. Apply a waterproofing agent to the sides and around the edges of the wooden floor using a roller or spray method, with a coating amount of 150 grams per square meter of flooring.

[0248] The samples of Examples 1-11 and Comparative Examples 1-5 were tested for their waterproof performance according to the requirements of 4.4-4.6 in GB / T 17657-2013 Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels. The anti-mildew performance of the flooring was tested according to LY / T 2230-2013 Evaluation of Anti-mildew Performance of Wood-based Panels. The results are shown in Table 1.

[0249] Table 1 Summary of Waterproof and Mildew Resistance of Wood Flooring After Edge Banding

[0250]

[0251] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A waterproofing agent for wood flooring edge sealing, characterized by, It is composed of the following raw materials by mass fraction: phenol modified melamine resin 90-95 parts and curing agent 5-10 parts, totaling 100 parts; The phenol modified melamine resin is obtained by the following preparation process: (1) add 4.5-5.5 moles of water and 16-18% polyvinyl alcohol by mass fraction in a reaction kettle, start the stirring device, and heat to 90-95℃, and stir until the polyvinyl alcohol is completely hydrolyzed; (2) cool to 55-65℃, add 0.02-0.04 moles of phosphoric acid, and keep for 15-30 minutes; (3) add 1.0 mole of phenol, and keep for 10-20 minutes; (4) add 0.65-0.95 moles of paraformaldehyde, heat to 92-98℃, and keep for 45-90 minutes; (5) cool to 70-75℃, adjust the pH value to 9.0-10.0 with fire alkali; (6) add 0.80-1.50 moles of paraformaldehyde, and keep the pH value of the reaction solution not less than 8.5; (7) add 0.1-1.0 moles of melamine, control the reaction temperature at 85-95℃, and detect the water miscibility of the resin, when the water miscibility is 1-2 times, add 1.2-1.5 moles of butanol, and keep for 15-45 minutes; (8) add 0.10-0.50 moles of urea, thiourea or its derivative, and react at 85-95℃ for 30-60 minutes, and it is obtained.

2. The water repellent agent for wood flooring edge banding according to claim 1, characterized by, The alcoholysis degree of the polyvinyl alcohol is 85%, and the average polymerization degree is 750-2000.

3. The water repellent agent for wood flooring edge banding according to claim 1, characterized by, The urea, thiourea or its derivative includes one or more combinations of urea, thiourea, sulfur dioxide, 1,2-ethylene thiourea, ethylamine thiourea, p-aminobenzenesulfonamide, acetamide or trimethylbutyramide.

4. The water repellent agent for wood flooring edge banding according to claim 1, characterized by, After step (8), it further includes: cool to below 50℃, and add 0.10-0.50% IPBC of the mass of the phenol modified melamine resin to improve the mildew resistance of the phenol modified melamine resin.

5. The water repellent agent for wood flooring edge banding according to claim 1, characterized by, The curing agent includes one or more combinations of toluene diisocyanate, isophorone diisocyanate or diphenylmethane diisocyanate.

6. A method of preparing a water repellent for edge sealing of wood flooring according to any one of claims 1 to 5, characterized in that, It includes the following preparation steps: add the phenol modified melamine resin and the curing agent into the reactor, and mix uniformly.

7. The use of the waterproof agent for wood floor edge sealing according to any one of claims 1-5 in the preparation of artificial boards.

8. Use according to claim 7, characterized in that, The waterproof agent for wood floor edge sealing is applied to the side of the artificial board in the form of roller coating or spraying.

9. Use according to claim 8, characterized in that, The amount of the waterproof agent for wood floor edge sealing is 100-150g per square meter of the artificial board.

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