Coating modifier capable of enhancing performance of plywood as well as preparation method and use method of coating modifier

Abstract

The invention relates to the technical field of adhesives, and provides a coating modifier capable of enhancing the performance of plywood, and the coating modifier is prepared from the following raw materials: nano montmorillonite, diethylenetriamine, KH-540, ethylene glycol diglycidyl ether, 2-methyl-4-pentene-1-alcohol, a photoinitiator and water. The invention also provides a preparation method and a use method of the coating modifier. Gluing is conducted after a plate is coated with the modifier, in the thermocuring process, adhesive components can be rapidly in covalent bond connection with the plate through hydroxyl, carboxyl, amino and the like so as to form a glue nail structure with a wood substrate, an interpenetrating network structure is formed between the adhesives through covalent bonds, and therefore the heat resistance of the wood is improved. Therefore, the water resistance and the strength of the plywood are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and particularly to a coating modifier capable of enhancing the performance of plywood. Background Art

[0002] In the prior art, traditional synthetic adhesives have the disadvantages of poor water resistance and low mechanical strength. Their performance may decline under high temperature, humidity or ultraviolet irradiation, resulting in reduced bonding strength or failure, and cannot ensure long-term reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a coating modifier capable of enhancing the performance of plywood and its preparation and use methods, so as to significantly improve the water resistance and bonding strength of plywood.

[0004] To solve the above technical problem, the technical solution of the present invention regarding the coating modifier is: a coating modifier capable of enhancing the performance of plywood, which is prepared from the following raw material components in parts by weight plus water: Nano-montmorillonite 5 - 8 parts H-540 10 - 30 parts Ethylene glycol diglycidyl ether 15 - 30 parts Diethylenetriamine 0.5 part 2-Methyl-4-penten-1-ol 1 - 5 parts Photoinitiator 0.5 part.

[0005] In one embodiment, the coating modifier is prepared from the following raw material components in parts by weight plus water: Nano-montmorillonite 5 parts H-540 10 parts Ethylene glycol diglycidyl ether 20 parts Diethylenetriamine 0.5 part 2-Methyl-4-penten-1-ol 3 parts Photoinitiator 0.5 part.

[0006] In one embodiment, the coating modifier is prepared from the following raw material components in parts by weight plus water: Nano-montmorillonite 10 parts H-540 10 parts Ethylene glycol diglycidyl ether 20 parts Diethylenetriamine 0.5 part 2-Methyl-4-penten-1-ol 3 parts Photoinitiator 0.5 part.

[0007] In one embodiment, the coating modifier is prepared from the following raw material components in parts by weight plus water: 5 parts of nano - montmorillonite 10 parts of H - 540 10 parts of ethylene glycol diglycidyl ether 0.5 part of diethylenetriamine 3 parts of 2 - methyl - 4 - penten - 1 - ol 0.5 part of photoinitiator.

[0008] In one embodiment, the coating modifier is prepared from the following raw material components in parts by weight plus water: 5 parts of nano - montmorillonite 10 parts of H - 540 20 parts of ethylene glycol diglycidyl ether 0.5 part of diethylenetriamine 1 part of 2 - methyl - 4 - penten - 1 - ol 0.5 part of photoinitiator.

[0009] The present invention relates to a preparation method of a coating modifier, which comprises the following steps: ① Mix 5 - 8 parts of nano - montmorillonite, 10 - 30 parts of KH - 540 and 62 - 85 parts of water, stir evenly, heat to 50 - 60 °C, react for 30 - 50 min, cool to room temperature, and then freeze - dry the precipitate to obtain the first product; ② Mix 0.5 - 5 parts of the first product with 15 - 30 parts of ethylene glycol diglycidyl ether and 67 - 85 parts of water, add 0.5 part of diethylenetriamine, stir evenly, heat to 50 - 60 °C under reflux conditions, and react for 10 - 20 min to obtain the second product; ③ Add 1 - 5 parts of 2 - methyl - 4 - penten - 1 - ol and 0.5 part of photoinitiator to the second product, stir until evenly mixed, irradiate with ultraviolet light to initiate the reaction for 2 - 4 h, and then perform centrifugal separation and freeze - dry to obtain the coating modifier.

[0010] The use method of the coating modifier in the present invention is: after mixing the coating modifier and water in a ratio of 1:0.2, quantitatively brush it onto the glue - to - be - coated surface of the veneer to obtain a modified veneer, then apply glue, and then bond multiple veneers after applying glue together and hot - press them into shape. The hot - press temperature is 120 - 135 °C, the hot - press pressure is 0.8 - 1.2 MPa, and the hot - press time is 180 - 300 s, and then artificial plywood is obtained.

[0011] The beneficial effects of the present invention are as follows: After applying the modifier of the present invention on the board and then applying glue, during the heat curing process, the adhesive components can quickly form covalent bonds with the board through hydroxyl groups, carboxyl groups, amino groups, etc., thereby forming a glue-nail structure with the wood substrate, and the adhesives themselves form an interpenetrating network structure through covalent bonds, thus significantly improving the water resistance and strength of the plywood. Detailed implementation mode

[0012] In order to make the purpose, technical solutions and advantages of the invention more clear and understandable, the present invention will be described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention. Example 1

[0013] A coating modifier capable of enhancing the performance of plywood is prepared from the following raw materials: nano-montmorillonite, diethylenetriamine, KH-540, ethylene glycol diglycidyl ether, 2-methyl-4-penten-1-ol, photoinitiator, water. The weight parts and addition sequence of each raw material component are as follows: ① Mix 5 parts of nano-montmorillonite, 10 parts of KH-540 and 85 parts of water, stir evenly, heat to 50-60 °C, react for 30 min, cool to room temperature, freeze-dry the precipitated substance, grind and pass through a 200-mesh sieve to obtain the first product; ② Mix 5 parts of the first product, 20 parts of ethylene glycol diglycidyl ether and 75 parts of water, then add 0.5 part of diethylenetriamine, stir evenly, heat to 50-60 °C under reflux conditions, and react for 15 min to obtain the second product; ③ Add 3 parts of 2-methyl-4-penten-1-ol and 0.5 part of photoinitiator to the second product, stir until uniform, irradiate with ultraviolet light to initiate the reaction for 2-4 h, then perform centrifugal separation and freeze-dry to obtain the coating modifier.

[0014] The usage method of the above coating modifier is: Mix the coating modifier with water in a ratio of 1:0.2, quantitatively brush it onto the glue-applying surface of the veneer, obtain the modified veneer and then apply glue, then bond multiple veneers with glue applied together and hot-press them into shape. The hot-pressing temperature is 120-135 °C, the hot-pressing pressure is 0.8-1.2 MPa, and the hot-pressing time is 180-300 s, and then the artificial plywood is obtained. Example 2

[0015] The raw materials and usage method of the coating modifier provided in this example are exactly the same as those in Example 1. The difference lies in the weight parts of the raw material components. Specifically, the weight parts and addition sequence of each raw material component are as follows: ① Mix 10 parts of nano-montmorillonite, 10 parts of KH-540 and 80 parts of water, stir evenly, heat to 50 - 60 °C, react for 30 min, cool to room temperature, freeze-dry the precipitated substance, grind it and sieve it through a 200-mesh sieve to obtain the first product; ② Mix 5 parts of the first product, 20 parts of ethylene glycol diglycidyl ether and 75 parts of water, add 0.5 part of diethylenetriamine, stir evenly, heat to 50 - 60 °C under reflux conditions, react for 15 min to obtain the second product; ③ Add 3 parts of 2-methyl-4-penten-1-ol and 0.5 part of photoinitiator to the second product, stir until uniform, irradiate with ultraviolet light to initiate the reaction for 2 - 4 h, then carry out centrifugal separation and freeze-dry to obtain the coating modifier. Example 3

[0016] The raw materials and usage method of the coating modifier provided in this example are exactly the same as those in Example 1, the difference lies in the weight parts of the raw material components. Specifically, the weight parts and addition sequence of each raw material component are as follows: ① Mix 5 parts of nano-montmorillonite, 10 parts of KH-540 and 85 parts of water, stir evenly, heat to 50 - 60 °C, react for 30 min, cool to room temperature, freeze-dry the precipitated substance, grind it and sieve it through a 200-mesh sieve to obtain the first product; ② Mix 5 parts of the first product, 10 parts of ethylene glycol diglycidyl ether and 85 parts of water, add 0.5 part of diethylenetriamine, stir evenly, heat to 50 - 60 °C under reflux conditions, react for 15 min to obtain the second product; ③ Add 3 parts of 2-methyl-4-penten-1-ol and 0.5 part of photoinitiator to the second product, stir until uniform, irradiate with ultraviolet light to initiate the reaction for 2 - 4 h, then carry out centrifugal separation and freeze-dry to obtain the coating modifier. Example 4

[0017] The raw materials and usage method of the coating modifier provided in this example are exactly the same as those in Example 1, the difference lies in the weight parts of the raw material components. Specifically, the weight parts and addition sequence of each raw material component are as follows: ① Mix 5 parts of nano-montmorillonite, 10 parts of KH-540 and 85 parts of water, stir evenly, heat to 50 - 60 °C, react for 30 min, cool to room temperature, freeze-dry the precipitated substance, grind it and sieve it through a 200-mesh sieve to obtain the first product; ② Mix 5 parts of the first product, 20 parts of ethylene glycol diglycidyl ether and 75 parts of water, add 0.5 part of diethylenetriamine, stir evenly, heat to 50 - 60 °C under reflux conditions, react for 15 min to obtain the second product; ③ Add 1 part of 2-methyl-4-penten-1-ol and 0.5 part of photoinitiator to the second product. After stirring until uniform, irradiate with ultraviolet light to initiate the reaction for 2 - 4 h, then perform centrifugal separation and freeze-drying to obtain the coating modifier. Comparative Example 1

[0018] The coating modifier provided in this comparative example does not contain KH540 in its raw materials, and the rest is the same as in Example 1. Comparative Example 2

[0019] The coating modifier provided in this comparative example does not contain nano-montmorillonite in its raw materials, and the rest is the same as in Example 1. Comparative Example 3

[0020] The coating modifier provided in this comparative example does not contain ethylene glycol diglycidyl ether in its raw materials, and the rest is the same as in Example 1. Comparative Example 4

[0021] The coating modifier provided in this comparative example does not contain 2-methyl-4-penten-1-ol in its raw materials, and the rest is the same as in Example 1.

[0022] Apply the coating modifiers of Examples 1 to 4 and Comparative Examples 1 to 4 to plywood respectively, and test their properties. The test results are shown in Table 1: Table 1 Performance Test of Plywood Gluing strength (dry state) MPa Gluing strength (after boiling water cooking for 2 h) MPa Example 1 2.65 2.01 Example 2 2.38 1.87 Example 3 2.11 1.82 Example 4 2.07 1.64 Comparative Example 1 0.71 —— Comparative Example 2 0.76 —— Comparative Example 3 0.62 —— Comparative Example 4 0.78 —— It can be seen from the test results in Table 1 that the coating modifiers of Examples 1 to 4 are much better than those of Comparative Examples 1 to 4 in terms of both bonding strength and water resistance, and the performance of Example 1 is the most excellent.

[0023] The above embodiments are the preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious substitution without departing from the concept of the technical solution is within the scope of the present invention patent.

[0024] In order to make it more convenient for those of ordinary skill in the art to understand the improvements of the present invention over the prior art, some descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have also been omitted in this application document. Those of ordinary skill in the art should be aware that these omitted elements can also constitute the content of the present invention.

Claims

1. A coating modifier capable of enhancing the performance of plywood, characterized in that: The coating modifier is prepared by adding water to the following raw material components in parts by weight: Nano-montmorillonite 5-8 parts H-540 10~30 copies 15-30 parts of ethylene glycol diglycidyl ether 0.5 parts of diethylenetriamine 1 to 5 parts of 2-methyl-4-penten-1-ol 0.5 parts of photoinitiator.

2. The coating modifier capable of enhancing the performance of plywood according to claim 1, characterized in that: The coating modifier is prepared by adding water to the following raw material components in parts by weight: 5 parts of nano-montmorillonite H-540 10 copies 20 parts of ethylene glycol diglycidyl ether 0.5 parts of diethylenetriamine 3 parts of 2-methyl-4-penten-1-ol 0.5 parts of photoinitiator.

3. The coating modifier capable of enhancing the performance of plywood according to claim 1, characterized in that: The coating modifier is prepared by adding water to the following raw material components in parts by weight: Nano-montmorillonite 10 parts H-540 10 copies 20 parts of ethylene glycol diglycidyl ether 0.5 parts of diethylenetriamine 3 parts of 2-methyl-4-penten-1-ol 0.5 parts of photoinitiator.

4. The coating modifier capable of enhancing the performance of plywood according to claim 1, characterized in that: The coating modifier is prepared by adding water to the following raw material components in parts by weight: 5 parts of nano-montmorillonite H-540 10 copies 10 parts of ethylene glycol diglycidyl ether 0.5 parts of diethylenetriamine 3 parts of 2-methyl-4-penten-1-ol 0.5 parts of photoinitiator.

5. The coating modifier capable of enhancing the performance of plywood according to claim 1, characterized in that: The coating modifier is prepared by adding water to the following raw material components in parts by weight: 5 parts of nano-montmorillonite H-540 10 copies 20 parts of ethylene glycol diglycidyl ether 0.5 parts of diethylenetriamine 1 part of 2-methyl-4-penten-1-ol 0.5 parts of photoinitiator.

6. A method for preparing a coating modifier capable of enhancing the properties of plywood as claimed in claim 1, characterized in that The following steps are involved: ① Mix 5-8 parts of nano-montmorillonite, 10-30 parts of KH-540 and 62-85 parts of water, stir evenly, heat to 50-60°C, react for 30-50 minutes, cool to room temperature, and freeze-dry the precipitate to obtain the first product; ② Mix 0.5-5 parts of the first product with 15-30 parts of ethylene glycol diglycidyl ether and 67-85 parts of water, then add 0.5 parts of diethylenetriamine, mix well, heat to 50-60°C under reflux conditions, react for 10-20 minutes, and obtain the second product; ③ Add 1 to 5 parts of 2-methyl-4-penten-1-ol and 0.5 parts of photoinitiator to the second product, stir until uniform, initiate the reaction by ultraviolet light for 2 to 4 hours, separate by centrifugation and freeze-dry to obtain a coating modifier.

7. A method for using the coating modifier capable of enhancing the performance of plywood according to any one of claims 1 to 6, characterized in that: The coating modifier is mixed with water in a ratio of 1:0.2, and then quantitatively applied to the surface of the veneer to be glued to obtain the modified veneer, and then glue is applied. Then, multiple veneers that have been glued are bonded together and hot-pressed. The hot-pressing temperature is 120-135°C, the hot-pressing pressure is 0.8-1.2 MPa, and the hot-pressing time is 180-300 s, and then the artificial plywood is obtained.