High-strength composite rationalized plate and preparation process thereof

Abstract

The application discloses a high-strength composite rationalization plate and a preparation process thereof, and belongs to the technical field of physical and chemical plate materials. The preparation process is characterized by bonding a layer of physical and chemical film on the upper and lower surfaces of a physical and chemical substrate by using an adhesive. The physical and chemical substrate is subjected to a modification treatment on a phenolic resin to improve the antibacterial property and toughness of the physical and chemical substrate. The physical and chemical film is added with nano fillers and other substances to improve the hydrophobicity and corrosion resistance of the physical and chemical film. The physical and chemical substrate and the physical and chemical film are bonded by using a modified phenolic resin, and cold pressing treatment is performed, so that the high-strength composite rationalization plate is finally obtained.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of physical and chemical plates, in particular to a high-strength composite physical and chemical plate and a preparation process thereof. BACKGROUND

[0002] The physical and chemical plate is also called a thermosetting laminated plate, and is an ideal material for manufacturing laboratory tables, medicine cabinets, partitions and hospital operating room placing tables. The physical and chemical plate is a plate prepared by impregnating phenolic resin into wood fibers and through high-temperature and high-pressure processing. The surface is subjected to special physical and chemical treatment and should have the performances of acid and corrosion resistance, antibiosis, scratch resistance, waterproofness and moisture resistance. The phenolic resin has good heat resistance and certain corrosion resistance to weak acid and weak base, is widely used in corrosion prevention engineering, wood adhesive, flame-retardant material and other fields. The physical and chemical plates prepared by some production processes have poor corrosion resistance and do not have antibiosis performance, and therefore, a high-strength composite physical and chemical plate needs to be researched and developed. SUMMARY

[0003] The application aims to provide a high-strength composite physical and chemical plate and a preparation process thereof to solve the problems in the background.

[0004] In order to solve the above technical problems, the application provides the following technical scheme.

[0005] A preparation process of a high-strength composite physical and chemical plate, the preparation process is as follows: taking a physical and chemical base plate, coating adhesive on both sides of the physical and chemical base plate, then covering a physical and chemical film, and cold-pressing to form a high-strength composite physical and chemical plate; wherein the single-side coating amount of the adhesive is 100-150 g / m 2 , the thickness of the physical and chemical base plate is 0.2-0.3 mm, and the thickness of the physical and chemical film is 0.1-0.3 mm.

[0006] The preparation steps of the physical and chemical base plate are as follows: 45-50 parts of wood fibers are dried to a moisture content of less than 5%, 50-60 parts of modified phenolic resin and 8-12 parts of hexamethylenetetramine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25-30 min, then hot pressing is performed, the hot pressing temperature is 200-250 DEG C, the working air pressure is 6-8 kg / cm 2 , and the hot-pressed product is cooled to 25-30 DEG C to obtain the physical and chemical base plate.

[0007] The preparation steps of the modified phenolic resin are as follows:

[0008] Step S1: continuously stirring 3.6-3.8 mmol / L silver nitrate solution is added to 0.5-0.8 g / L graphene oxide solution, mixed evenly, 1 ml 1-2% sodium citrate solution is added and mixed evenly under ultrasonic, then 2 mol / L sodium borohydride solution is slowly added, centrifuged after adjusting pH to 11 with 2 mol / L sodium hydroxide, and the graphene oxide nanosilver composite is obtained after washing and drying;

[0009] Step S2: phenol, formaldehyde and graphene oxide nanosilver composite are weighed and mixed, ultrasonic treatment is performed for 1 h, and after condensation reflux stirring, the temperature is increased to 50 DEG C, oxalic acid is added, and the reaction is carried out at 95 DEG C for 3-4 h, E-51 epoxy resin is added and reacted for 0.5 h, and after the reaction is completed, the product is washed and dried at 90-100 DEG C for 2-3 h, and then the modified phenolic resin is obtained by grinding into powder and sieving, wherein the mass ratio of phenol to formaldehyde is 1:0.85, the mass fraction of graphene oxide nanosilver composite is 0.2-0.4% of the total mass, the mass of oxalic acid is 2-3% of the mass of phenol, and the mass of E-51 epoxy resin is 10-20% of the total mass.

[0010] The specific steps for preparing the physicochemical film are as follows: 7-10 parts of E-51 epoxy resin and 80-90 parts of self-crosslinking water-based fluorocarbon resin are uniformly mixed, then 5-6 parts of polytetrafluoroethylene TF5070, 2-3 parts of nanofiller, and 1-2 parts of heptadecafluorodecyltrioxysilane are sequentially added, stirring is performed for 3-4 h, and finally 1-2 parts of self-crosslinking water-based fluorocarbon resin curing agent H384 is added, the above-mentioned materials are loaded into a spraying machine, sprayed on color paper, dried at 80-90 DEG C for 20-30 min, then the temperature is increased to 180-200 DEG C and kept for 20-30 min, and the physicochemical film is prepared by slowly cooling. The preparation method of the nanofiller is as follows: silica is added to a graphene oxide dispersion liquid, ultrasonic dispersion is performed for 20-30 min, stirring is performed after adding silane coupling agent KH-550, and reaction is performed at 70-80 DEG C for 10-12 h, and then the nanofiller is obtained after washing and drying, wherein the mass ratio of graphene oxide, silica and silane coupling agent KH-550 is 1:2:2; the non-sprayed surface of the physicochemical film and the physicochemical substrate are bonded by using an adhesive.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] The present application discloses a kind of high-strength composite physicochemical plate and preparation process thereof, for the selection and preparation process of physicochemical substrate, physicochemical film and adhesive material, improve the overall performance of composite board.

[0013] The modified phenolic resin in the physical and chemical substrate is selected, the graphene oxide nano-silver composite material and the epoxy resin are added to the phenolic resin, the nano-silver has excellent antibacterial property due to the nano material characteristics, but the antibacterial property is affected due to the self-aggregation of the nano-silver itself, therefore, the nano-silver is stably dispersed by being loaded on the graphene oxide, and the antibacterial property is enhanced. The epoxy resin reacts with the hydroxymethyl and phenolic hydroxyl in the phenolic resin through the epoxy group, and the toughness and mechanical property of the phenolic resin are improved.

[0014] The self-crosslinking waterborne fluorocarbon resin in the physical and chemical film has excellent properties such as strong adhesion, good heat resistance, waterproofness, antifouling property, acid and alkali resistance and salt resistance, the polytetrafluoroethylene is added, and the hydrophobic property of the coating is improved after high-temperature treatment; the epoxy resin is added to improve the corrosion resistance and wear resistance, the nano filler is graphene oxide and silicon dioxide, and the corrosion resistance and mechanical property of the coating can be improved, and the hydrophilicity is reduced. The above substances are added, and the mechanical properties such as impact resistance of the coating are effectively improved.

[0015] The physical and chemical film is adhered to both sides of the physical and chemical substrate through the modified phenolic resin adhesive, and the mechanical property of the composite board is greatly improved, and the high-strength composite physical and chemical board is prepared. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0017] In the embodiments, the average size of the graphene oxide sheet diameter is 10 μm, the self-crosslinking waterborne fluorocarbon resin curing agent H384 is purchased from Jining Huakai Resin Co., Ltd., the wood fiber is poplar wood fiber, and the size is 0.5 mm, the following mass parts are all g, the self-crosslinking waterborne fluorocarbon resin model is FEM-101A-2, and is purchased from Jining Huakai Resin Co., Ltd.

[0018] In the embodiments, the average size of the graphene oxide sheet diameter is 10 μm, the self-crosslinking waterborne fluorocarbon resin curing agent H384 is purchased from Jining Huakai Resin Co., Ltd., the wood fiber is poplar wood fiber, and the size is 0.5 mm, the following mass parts are all g, the self-crosslinking waterborne fluorocarbon resin model is FEM-101A-2, and is purchased from Jining Huakai Resin Co., Ltd. 2 The thickness of the physical and chemical substrate is 0.2 mm, and the thickness of the physical and chemical film is 0.2 mm.

[0019] The preparation steps of the physical and chemical substrate are as follows: 45 parts of wood fiber is dried to a water content of less than 5%, 50 parts of modified phenolic resin and 8 parts of hexamethylenetetramine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25 min, and then hot pressing is performed, the hot pressing temperature is 200 DEG C, and the working air pressure is 8 kg / cm2 , hot press forming is cooled to 25℃, and a physicochemical substrate is obtained.

[0020] The preparation steps of the modified phenolic resin are as follows:

[0021] Step S1: continuously stirring 3.8 mmol / L silver nitrate solution is added to 0.8 g / L graphene oxide solution, mixed uniformly, 1 ml 1% sodium citrate solution is added and mixed uniformly under ultrasonic, then 2 mol / L sodium borohydride solution is slowly added, and after adjusting pH to 11 with 2 mol / L sodium hydroxide, centrifugation, washing and drying, a graphene oxide-silver nanocomposite is obtained;

[0022] Step S2: phenol, formaldehyde and graphene oxide-silver nanocomposite are weighed and mixed, ultrasonic treatment is performed for 1 h, and after condensation reflux stirring, the temperature is raised to 50℃, oxalic acid is added, and at 95℃, the reaction is carried out for 3 h, E-51 epoxy resin is added and reacted for 0.5 h, after the reaction is completed, the product is washed and dried at 90℃ for 3 h, and then it is ground into powder and sieved to obtain the modified phenolic resin. The mass ratio of phenol to formaldehyde is 1:0.85, the mass fraction of graphene oxide-silver nanocomposite is 0.2% of the total mass, the mass of oxalic acid is 2% of the mass of phenol, and the mass fraction of E-51 epoxy resin is 10% of the total mass.

[0023] The preparation steps of the physicochemical film are as follows: 10 parts of E-51 epoxy resin and 90 parts of self-crosslinking water-based fluorocarbon resin are uniformly mixed, then 5 parts of polytetrafluoroethylene TF5070, 2 parts of nano filler and 1 part of heptadecafluorodecyltrioxysilane are sequentially added, stirring is performed for 3 h, and finally 1 part of self-crosslinking water-based fluorocarbon resin curing agent H384 is added, the above-mentioned materials are loaded into a spraying machine, sprayed on colored paper, dried at 90℃ for 30 min, then the temperature is raised to 180℃ and kept for 30 min, and the physicochemical film is prepared by slowly cooling. The nano filler is prepared in the following manner: silica is added to a graphene oxide dispersion liquid, ultrasonic dispersion is performed for 30 min, silane coupling agent KH-550 is added and stirred, and reaction is performed at 80℃ for 10 h, and then washing and drying are performed to obtain the nano filler, wherein the mass ratio of graphene oxide, silica and silane coupling agent KH-550 is 1:2:2; the un-sprayed surface of the physicochemical film is bonded to the physicochemical substrate with an adhesive.

[0024] In example 2, a preparation process of a high-strength composite physicochemical plate is provided, and the preparation process is as follows: a physicochemical substrate is taken, an adhesive is coated on both sides of the physicochemical substrate, a physicochemical film is coated thereon, cold press forming is performed, and a high-strength composite physicochemical plate is obtained; wherein the single-sided coating amount of the adhesive is 150 g / m 2 , the thickness of the physicochemical substrate is 0.2 mm, and the thickness of the physicochemical film is 0.2 mm.

[0025] The preparation steps of the physicochemical substrate are as follows: 45 parts of wood fibers are dried to a moisture content of less than 5%, 50 parts of modified phenolic resin and 8 parts of hexamethylenetetramine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25 min, and then hot pressing is performed at a hot pressing temperature of 200 DEG C and a working air pressure of 8 kg / cm 2 , and the hot-pressed product is cooled to 25 DEG C to obtain the physicochemical substrate.

[0026] The preparation steps of the modified phenolic resin are as follows:

[0027] Step S1: continuously stirring 3.8 mmol / L silver nitrate solution is added to 0.8 g / L graphene oxide solution, mixed uniformly, 1 ml of 1% sodium citrate solution is added and mixed uniformly under ultrasonic, then 2 mol / L sodium borohydride solution is slowly added, and after adjusting pH to 11 with 2 mol / L sodium hydroxide, centrifugation, washing and drying are performed to obtain graphene oxide-silver nanocomposite;

[0028] Step S2: phenol, formaldehyde and graphene oxide-silver nanocomposite are weighed and mixed, ultrasonic treatment is performed for 1 h, and after stirring and condensation reflux, the temperature is raised to 50 DEG C, oxalic acid is added, and the reaction is carried out at 95 DEG C for 3 h, E-51 epoxy resin is added and reacted for 0.5 h, after the reaction is completed, the product is washed and dried at 90 DEG C for 3 h, and then it is ground into powder and sieved to obtain the modified phenolic resin. The mass ratio of phenol to formaldehyde is 1:0.85, the mass fraction of graphene oxide-silver nanocomposite is 0.3% of the total mass, the mass of oxalic acid is 2% of the mass of phenol, and the mass of E-51 epoxy resin is 10% of the total mass.

[0029] The preparation steps of the physicochemical film are as follows: 8 parts of E-51 epoxy resin and 90 parts of self-crosslinking water-based fluorocarbon resin are uniformly mixed, then 6 parts of polytetrafluoroethylene TF5070, 2 parts of nano filler and 1 part of heptadecafluorodecyltrioxysilane are added in sequence, stirring is performed for 3 h, and finally 1 part of self-crosslinking water-based fluorocarbon resin curing agent H384 is added, the above-mentioned materials are loaded into a spraying machine, sprayed on colored paper, dried at 90 DEG C for 20 min, then the temperature is raised to 180 DEG C and kept for 30 min, and then slowly cooled to obtain the physicochemical film. The preparation method of the nano filler is as follows: silica is added to graphene oxide dispersion liquid, ultrasonic dispersion is performed for 30 min, stirring is performed with silane coupling agent KH-550, reaction is performed at 80 DEG C for 10 h, and then washing and drying are performed to obtain the nano filler, wherein the mass ratio of graphene oxide, silica and silane coupling agent KH-550 is 1:2:2; the un-sprayed surface of the physicochemical film is bonded to the physicochemical substrate with an adhesive.

[0030] In example 3, a preparation process of a high-strength composite physicochemical plate is provided, the preparation process is as follows: taking a physicochemical substrate, coating an adhesive on both sides of the physicochemical substrate, then covering a physicochemical film, cold pressing and forming to obtain a high-strength composite physicochemical plate; wherein the single-sided coating amount of the adhesive is 150 g / m2 The physicochemical substrate has a thickness of 0.3 mm, and the physicochemical film has a thickness of 0.2 mm.

[0031] The preparation steps of the physicochemical substrate are as follows: 45 parts of wood fibers are dried to a moisture content of less than 5%, 60 parts of modified phenolic resin and 12 parts of methenamine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25 min, and then hot pressing is performed, the hot pressing temperature is 200 DEG C, and the working air pressure is 8 kg / cm 2 The hot-pressed product is cooled to 25 DEG C to obtain the physicochemical substrate.

[0032] The preparation steps of the modified phenolic resin are as follows:

[0033] Step S1: continuously stirring 3.8 mmol / L silver nitrate solution is added to 0.8 g / L graphene oxide solution, mixed uniformly, 1 ml of 1% sodium citrate solution is added and mixed uniformly under ultrasonic, then 2 mol / L sodium borohydride solution is slowly added, centrifuged after adjusting pH to 11 with 2 mol / L sodium hydroxide, washed and dried to obtain graphene oxide-silver nanocomposite;

[0034] Step S2: phenol, formaldehyde and graphene oxide-silver nanocomposite are weighed and mixed, ultrasonic treatment is performed for 1 h, condensation reflux is performed under stirring, then the temperature is raised to 50 DEG C, oxalic acid is added, the reaction is performed at 95 DEG C for 3 h, E-51 epoxy resin is added and reacted for 0.5 h, after the reaction is completed, the product is washed and dried at 90 DEG C for 3 h, then it is ground into powder and sieved to obtain the modified phenolic resin. The mass ratio of phenol to formaldehyde is 1:0.85, the mass fraction of graphene oxide-silver nanocomposite is 0.4% of the total mass, the mass of oxalic acid is 2% of the mass of phenol, and the mass of E-51 epoxy resin is 10% of the total mass.

[0035] The preparation steps of the physicochemical film are as follows: 7 parts of E-51 epoxy resin and 90 parts of self-crosslinking water-based fluorocarbon resin are uniformly mixed, then 6 parts of polytetrafluoroethylene TF5070, 2 parts of nano filler and 2 parts of heptadecafluorodecyltrioxysilane are added in sequence, stirring is performed for 3 h, and finally 1 part of self-crosslinking water-based fluorocarbon resin curing agent H384 is added, the above-mentioned materials are loaded into a spraying machine, sprayed on color paper, dried at 90 DEG C for 20 min, then the temperature is raised to 180 DEG C and kept for 30 min, and slowly cooled to obtain the physicochemical film. The nano filler is prepared in the following manner: silica is added to a graphene oxide dispersion liquid, ultrasonic dispersion is performed for 30 min, stirring is performed with silane coupling agent KH-550, reaction is performed at 80 DEG C for 10 h, and then washing and drying are performed to obtain the nano filler, wherein the mass ratio of graphene oxide, silica and silane coupling agent KH-550 is 1:2:2; the non-sprayed surface of the physicochemical film is bonded to the physicochemical substrate with an adhesive.

[0036] Comparative Example 1: Comparative Example 1 is a control test of Example 3, and no graphene oxide nanosilver compound is added to the modified phenolic resin in the physical-chemical substrate of Example 3.

[0037] The present example provides a preparation process of a high-strength composite physical-chemical plate, which comprises the following steps: taking a physical-chemical substrate, coating adhesive on both sides of the physical-chemical substrate, then covering a physical-chemical film, and cold-pressing to obtain a high-strength composite physical-chemical plate; wherein the single-side coating amount of the adhesive is 150 g / m 2 , the thickness of the physical-chemical substrate is 0.3 mm, and the thickness of the physical-chemical film is 0.2 mm.

[0038] The preparation steps of the physical-chemical substrate are as follows: 45 parts of wood fibers are dried to a moisture content of less than 5%, 60 parts of modified phenolic resin and 12 parts of methenamine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25 min, then hot-pressed at a temperature of 200℃ and a working air pressure of 8 kg / cm 2 , and cooled to 25℃ after hot-pressing to obtain the physical-chemical substrate.

[0039] The preparation steps of the modified phenolic resin are as follows:

[0040] Phenol and formaldehyde are weighed and mixed, ultrasonic treatment is performed for 1 h, after stirring and condensation reflux, the temperature is raised to 50℃, oxalic acid is added, the reaction is carried out at 95℃ for 3 h, E-51 epoxy resin is added and reacted for 0.5 h, after the reaction is completed, the product is washed and dried at 90℃ for 3 h, and then ground into powder and sieved to obtain the modified phenolic resin. The molar ratio of phenol to formaldehyde is 1:0.85, the mass fraction of graphene oxide nanosilver compound is 0.4% of the total mass, the mass of oxalic acid is 2% of the mass of phenol, and the mass of E-51 epoxy resin is 10% of the total mass.

[0041] The preparation steps of the physical-chemical film are as follows: 7 parts of E-51 epoxy resin and 90 parts of self-crosslinking water-based fluorocarbon resin are uniformly mixed, then 6 parts of polytetrafluoroethylene TF5070, 2 parts of nanofiller, and 2 parts of heptadecafluorodecyltrioxysilane are added in sequence, stirred for 3 h, and finally 1 part of self-crosslinking water-based fluorocarbon resin curing agent H384 is added, the above-mentioned materials are loaded into a spraying machine, sprayed on colored paper, dried at 90℃ for 20 min, then the temperature is raised to 180℃ and kept for 30 min, and slowly cooled to obtain the physical-chemical film. The preparation method of the nanofiller is as follows: silica is added to a graphene oxide dispersion liquid, ultrasonic dispersion is performed for 30 min, silane coupling agent KH-550 is added and stirred, and the reaction is carried out at 80℃ for 10 h, then washed and dried to obtain the nanofiller, wherein the mass ratio of graphene oxide, silica, and silane coupling agent KH-550 is 1:2:2; the non-sprayed surface of the physical-chemical film is bonded to the physical-chemical substrate with adhesive.

[0042] Comparative Example 2: Comparative Example 2 is a control test of Example 3, in which only 3 parts of E-51 epoxy resin is added in the physical-chemical film of Example 3, which is much lower than the set range.

[0043] The present example provides a preparation process of a high-strength composite physical-chemical plate, which comprises the following steps: taking a physical-chemical substrate, coating an adhesive on both sides of the physical-chemical substrate, then covering a physical-chemical film, and cold-pressing to form a high-strength composite physical-chemical plate; wherein the single-side coating amount of the adhesive is 150 g / m 2 , the thickness of the physical-chemical substrate is 0.3 mm, and the thickness of the physical-chemical film is 0.2 mm.

[0044] The preparation steps of the physical-chemical substrate are as follows: 45 parts of wood fiber is dried to a moisture content of less than 5%, 60 parts of modified phenolic resin and 12 parts of hexamethylenetetramine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25 min, then hot-pressed at a temperature of 200℃ and a working air pressure of 8 kg / cm 2 , and cooled to 25℃ after hot-pressing to form a physical-chemical substrate.

[0045] The preparation steps of the modified phenolic resin are as follows:

[0046] Step S1: continuously stirring 3.8 mmol / L silver nitrate solution is added to 0.8 g / L graphene oxide solution, mixed uniformly, 1 ml of 1% sodium citrate solution is added and mixed uniformly under ultrasonic, then 2 mol / L sodium borohydride solution is slowly added, centrifuged after adjusting pH to 11 with 2 mol / L sodium hydroxide, washed and dried to obtain graphene oxide-silver nanocomposite;

[0047] Step S2: phenol, formaldehyde and graphene oxide-silver nanocomposite are weighed and mixed, ultrasonic treatment is performed for 1 h, condensation reflux is performed under stirring, then the temperature is raised to 50℃, oxalic acid is added, the reaction is carried out at 95℃ for 3 h, E-51 epoxy resin is added and reacted for 0.5 h, after the reaction is completed, the product is washed and dried at 90℃ for 3 h, then it is ground into powder and sieved to obtain modified phenolic resin. The molar ratio of phenol to formaldehyde is 1:0.85, the mass fraction of graphene oxide-silver nanocomposite is 0.4% of the total mass, the mass of oxalic acid is 2% of the mass of phenol, and the mass of E-51 epoxy resin is 10% of the total mass.

[0048] The preparation steps of the physicochemical film are as follows: 3 parts of E-51 epoxy resin is uniformly mixed with 90 parts of self-crosslinking water-based fluorocarbon resin, then 6 parts of polytetrafluoroethylene TF5070, 2 parts of nano filler, and 2 parts of heptadecafluorodecyltrioxysilane are added in sequence, stirred for 3 hours, and finally 1 part of self-crosslinking water-based fluorocarbon resin curing agent H384 is added. The above-mentioned materials are loaded into a spraying machine, sprayed on color paper, dried at 90°C for 20 minutes, then heated to 180°C for 30 minutes, and slowly cooled to obtain the physicochemical film. The preparation method of the nano filler is as follows: silica is added to the graphene oxide dispersion solution, ultrasonic dispersion is performed for 30 minutes, the silane coupling agent KH-550 is added and stirred, and reaction is performed at 80°C for 10 hours. After washing and drying, the nano filler is obtained. The mass ratio of graphene oxide, silica and silane coupling agent KH-550 is 1:2:2. The non-sprayed surface of the physicochemical film is bonded to the physicochemical substrate by using an adhesive.

[0049] Comparative Example 3: Comparative Example 3 is a control test of Example 3, and no mixed nano filler is added in the physicochemical film of Example 3.

[0050] The preparation process of the high-strength composite physicochemical plate is as follows: taking a physicochemical substrate, coating an adhesive on both sides of the physicochemical substrate, then covering a physicochemical film, and cold-pressing to obtain a high-strength composite physicochemical plate. The single-sided coating amount of the adhesive is 150 g / m 2 , the thickness of the physicochemical substrate is 0.3 mm, and the thickness of the physicochemical film is 0.2 mm.

[0051] The preparation steps of the physicochemical substrate are as follows: 45 parts of wood fiber is dried to a moisture content of less than 5%, 60 parts of modified phenolic resin and 12 parts of hexamethylenetetramine are added and uniformly mixed, the uniformly mixed material is placed in a mold for 25 minutes, then hot pressing is performed, the hot pressing temperature is 200°C, the working air pressure is 8 kg / cm 2 , and the hot-pressed product is cooled to 25°C to obtain the physicochemical substrate.

[0052] The preparation steps of the modified phenolic resin are as follows:

[0053] Step S1: continuously stirring 3.8 mmol / L silver nitrate solution is added to 0.8 g / L graphene oxide solution, uniformly mixed, 1 ml of 1% sodium citrate solution is added and uniformly mixed under ultrasonic, then 2 mol / L sodium borohydride solution is slowly added, the pH is adjusted to 11 with 2 mol / L sodium hydroxide, centrifuged, washed and dried to obtain graphene oxide-silver nanocomposite;

[0054] Step S2: phenol, formaldehyde, graphene oxide-silver nanoparticle composite were mixed, ultrasonic treatment was carried out for 1 h, after stirring and condensation reflux, the temperature was increased to 50℃, oxalic acid was added, the reaction was carried out at 95℃ for 3 h, E-51 epoxy resin was added and reacted for 0.5 h, after the reaction was completed, the product was washed, dried at 90℃ for 3 h, ground into powder and sieved to obtain the modified phenolic resin. The mass ratio of phenol to formaldehyde was 1:0.85, the mass fraction of graphene oxide-silver nanoparticle composite was 0.4% of the total mass, the mass of oxalic acid was 2% of the mass of phenol, and the mass fraction of E-51 epoxy resin was 10% of the total mass.

[0055] The specific steps for preparing the physicochemical film are as follows: 7 parts of E-51 epoxy resin and 90 parts of self-crosslinking water-based fluorocarbon resin are uniformly mixed, then 6 parts of polytetrafluoroethylene TF5070 and 2 parts of heptadecafluorodecyltrioxysilane are added in sequence, stirring is carried out for 3 h, finally 1 part of self-crosslinking water-based fluorocarbon resin curing agent H384 is added, the above-mentioned materials are loaded into a spraying machine, sprayed on colored paper, dried at 90℃ for 20 min, then the temperature is increased to 180℃ and kept for 30 min, and the physicochemical film is prepared by slowly cooling; the un-sprayed surface of the physicochemical film and the physicochemical substrate are bonded with an adhesive.

[0056] Detection test:

[0057] 1. The physicochemical plates prepared in Examples 1-3 and Comparative Examples 1-3 are subjected to antibacterial test: according to LY / T 1926-2020, Escherichia coli is used as the detection strain, and the antibacterial rate is calculated after 24 h of culture at 37℃ and relative humidity > 90%.

[0058] 2. The physicochemical plates prepared in Examples 1-3 and Comparative Examples 1-3 are subjected to hydrophobic performance test: 5 μl of deionized water is dropped on the surface of each sample at 25℃, and the water contact angle under static state is tested by a water contact angle tester, 7 groups of data are taken for each sample, and the average value is calculated.

[0059] 3. The physicochemical plates prepared in Examples 1-3 and Comparative Examples 1-3 are subjected to corrosion resistance test: the samples are placed in a salt spray chamber containing 5% NaCl, and the surface of the physicochemical plate is observed after 72 h and recorded.

[0060] 4. The physicochemical plates prepared in Examples 1-3 and Comparative Examples 1-3 are subjected to impact resistance test on the physicochemical film coating: according to GB / T 1732-2020, the weight is adjusted to a certain height, and it is allowed to fall naturally, and the coating is observed for damage after impact, the maximum height at which no damage is observed in three tests is taken as the evaluation of impact resistance performance cm.

[0061]

[0062] Example 1-3 prepared physical and chemical plate due to the fine-tuning of its formulation, performance showed greater or lesser differences, wherein example 3 in the three have a more excellent performance. Comparative example 1-3 are for example 3 study the impact of different components, Comparative example 1 for the addition of nano-silver in the physical and chemical substrate study its role in the antibacterial properties, Comparative example 2 for the addition of epoxy resin in the physical and chemical film study hydrophobic and corrosion resistance, Comparative example 3 for the nano filler study wear resistance.

[0063] From the above example 1-3, comparative example 1-3 data can be obtained, the modified phenolic resin in the physical and chemical substrate added graphene loaded nano-silver greatly improved the antibacterial properties of the composite physical and chemical plate, added practical use for the physical and chemical plate; The physical and chemical film has hydrophobic, corrosion resistance can be well applied to the laboratory bench, the physical and chemical substrate and the physical and chemical film through the modified phenolic resin adhesive, greatly improve the impact resistance of the composite plate, based on the above experiment, the composite physical and chemical plate prepared by experiment 3 scheme has excellent antibacterial properties, corrosion resistance, impact resistance and hydrophobicity.

[0064] Conclusion: the application discloses a kind of high-strength composite physical and chemical plate and preparation process thereof, scheme design is reasonable, each step parameter is suitable, and the composite physical and chemical plate prepared has excellent performance.

[0065] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application is described in detail with reference to the foregoing examples, for the person skilled in the art, it still can be modified the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A process for the production of high strength composite rationalized panels, characterized in that, The high-strength composite physical-chemical plate is obtained by coating adhesive on both sides of a physical-chemical substrate, coating a physical-chemical film, and cold-pressing forming; wherein the single-side coating amount of the adhesive is 100-150 g / m 2 , the thickness of the physical-chemical substrate is 0.2-0.3 mm, and the thickness of the physical-chemical film is 0.1-0.3 mm. The preparation of the physicochemical substrate comprises the following steps: drying wood fibers to a moisture content of 5% or less, adding modified phenolic resin and hexamethylenetetramine, mixing the materials uniformly, placing the mixed materials in a mold for 25-30 minutes, and then hot-pressing at a temperature of 200-250 DEG C and an air pressure of 6-8 kg / cm 2 , hot-pressing and forming, and cooling to 25-30 DEG C to obtain the physicochemical substrate. The preparation steps of the modified phenolic resin are: Step S1: continuously stirring the silver nitrate solution is added to the graphene oxide solution, mixed uniformly, sodium citrate is added and mixed uniformly under ultrasonic, then sodium borohydride solution is slowly added, centrifuged after adjusting pH to 11 by sodium hydroxide, and the graphene oxide nanosilver composite is obtained after washing and drying; Step S2: phenol, formaldehyde and the graphene oxide nanosilver composite are mixed, ultrasonic treatment is performed for 1h, condensation reflux is performed under stirring, then the temperature is increased to 50℃, oxalic acid is added, reaction is performed at 95℃ for 3-4h, epoxy resin is added and reacts for 0.5h, the product is washed after the reaction is completed, dried at 90-100℃ for 2-3h, ground into powder and sieved to obtain the modified phenolic resin; The preparation steps of the physicochemical film are: after the epoxy resin and the self-crosslinking water-based fluorocarbon resin are mixed uniformly, polytetrafluoroethylene, nanofiller and heptadecafluorodecyltrichlorosilane are sequentially added, stirring is performed for 3-4h, and finally the curing agent is added, the above materials are loaded into a spraying machine, sprayed on color paper, dried at 80-90℃ for 20-30min, the temperature is increased to 180-200℃, and the film is prepared by keeping the temperature for 20-30min and slowly cooling. The preparation method of the nanofiller is: silica is added to the graphene oxide dispersion liquid, ultrasonic dispersion is performed for 20-30min, the silane coupling agent is added and stirred, and reaction is performed at 70-80℃ for 10-12h, and the nanofiller is obtained after washing and drying, wherein the mass ratio of graphene oxide, silica and silane coupling agent is 1:2:

2.

2. The process for producing a high-strength composite rationalized plate according to claim 1, characterized by, The amount of each substance used in the preparation of the physicochemical substrate is: 45-50 parts of wood fiber, 50-60 parts of modified phenolic resin, and 8-12 parts of hexamethylenetetramine.

3. The process for producing a high-strength composite rationalized plate according to claim 1, characterized by, In step S2, the amount-of-substance ratio of phenol to formaldehyde is 1:0.85, the mass fraction of the graphene oxide nanosilver composite is 0.2-0.4wt% of the total mass, the mass of oxalic acid is 2-3wt% of the mass of phenol, and the mass of epoxy resin is 10-20wt% of the total mass.

4. The process for producing a high-strength composite rationalized plate according to claim 1, wherein The amount of each substance used in the preparation of the physicochemical film is: 7-10 parts of epoxy resin, 80-90 parts of self-crosslinking water-based fluorocarbon resin, 5-6 parts of polytetrafluoroethylene, 2-3 parts of nanofiller, 1-2 parts of heptadecafluorodecyltrichlorosilane, and 1-2 parts of curing agent.

5. The process for producing a high-strength composite rationalized plate according to claim 1, wherein The adhesive is the modified phenolic resin.

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