CN111335069A - Impregnated paper and preparation method thereof - Google Patents
Impregnated paper and preparation method thereof Download PDFInfo
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- CN111335069A CN111335069A CN202010215724.3A CN202010215724A CN111335069A CN 111335069 A CN111335069 A CN 111335069A CN 202010215724 A CN202010215724 A CN 202010215724A CN 111335069 A CN111335069 A CN 111335069A
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- glue
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- melamine
- adhesive
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/51—Triazines, e.g. melamine
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/34—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds and acyclic or carbocyclic compounds
- C08G12/36—Ureas; Thioureas
- C08G12/38—Ureas; Thioureas and melamines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/52—Epoxy resins
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/57—Polyureas; Polyurethanes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to the technical field of impregnated paper, and particularly discloses impregnated paper and a preparation method thereof, wherein the impregnated paper can be impregnated on two sides and is sequentially provided with a raw paper layer, a shadowless adhesive net and a melamine adhesive layer from inside to outside; the raw paper layer is raw paper or balance paper; the shadowless glue net is composed of a fine cotton wire net or a silk wire net which is soaked with shadowless glue and then cured by ultraviolet irradiation and melamine glue, and the mesh density is 8-28 meshes; the melamine glue is mainly prepared by compounding melamine and formaldehyde. The impregnated paper has prestress through the tensioned shadowless adhesive net, is not only a pollution-free and volatile adhesive material, but also can improve the tensile strength and the shock resistance of the impregnated paper through the net, so that the paper is not easy to damage and deform.
Description
Technical Field
The invention relates to the technical field of impregnated paper, and particularly discloses impregnated paper and a preparation method thereof.
Background
The existing impregnated paper is basically prepared by mixing non-woven wood pulp, PE and plant fiber, has strong absorption force and dissolution resistance, is widely applied to veneers of cabinets, wardrobes and composite floors, is mostly prepared from raw paper layers, plain color layers and the like, has insufficient interlayer adhesive force, is easy to generate interlayer separation phenomenon, has low impact resistance and tensile resistance, is easy to cause the whole sheet of the impregnated paper to be partially damaged due to external impact force, even falls off from the cabinets, wardrobes and bottom plates in a large area, has short service life, and is difficult to achieve good hardness and flexibility.
Disclosure of Invention
The present invention is directed to a impregnated paper and a method for preparing the same, which solves the problems set forth above in the background art.
The technical scheme of the invention is as follows:
in order to achieve the purpose, the invention provides the following technical scheme: an impregnated paper characterized by: the impregnated paper can be impregnated on two sides, and is sequentially provided with a raw paper layer, a shadowless adhesive net and a melamine adhesive layer from inside to outside; the raw paper layer is raw paper or balance paper; the shadowless adhesive net consists of a fine cotton wire net or silk wire net which is soaked with shadowless adhesive and then cured by ultraviolet irradiation and melamine adhesive; the melamine glue is mainly prepared by compounding melamine and formaldehyde.
7. The shadowless adhesive formula used for the shadowless adhesive net comprises the following components in parts by weight: 40-60 parts of prepolymer, 20-40 parts of monomer, 4-8 parts of photoinitiator and 15-25 parts of curing agent.
Preferably, the formula of the shadowless adhesive also comprises 3-6 parts of heat-conducting filler; the prepolymer comprises epoxy acrylate and polyurethane acrylic resin in a ratio of (1:1) - (1: 3); the monomer is one or more of isobornyl acrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate; the photoinitiator is 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO) or benzophenone; the heat conducting filler is carbon nano tube.
The fine cotton wire net or silk wire net used by the shadowless adhesive net is water-absorbing cotton wire or water-absorbing silk wire, the diameter is 0.08-0.13mm, and the mesh density is 8-28 meshes.
Preferably, the shadowless adhesive net uses a fine cotton wire net or silk wire net made of superfine fibers and has a diameter of 0.10 mm.
The shadowless glue net is prepared by the following method:
(1) weighing the raw materials according to the weight percentage of the formula;
(2) at the stirring speed of 1200r/min, firstly, fully mixing the epoxy acrylate and the polyurethane acrylic resin, then sequentially adding the monomer, the photoinitiator and the heat-conducting filler, stirring for 30-45min to obtain the shadowless glue, and maintaining the stirring speed of 300 + 500r/min in a glue pool;
(3) and (3) fully soaking the fine cotton wire mesh or the silk wire mesh into a glue pool filled with the shadowless glue water in the step (2) and continuously stirring, taking out after 10-20min, unfolding and tensioning to obtain the shadowless glue net.
The melamine glue layer and the melamine glue filled in the shadowless glue net comprise the following raw materials in parts by weight: 5-10 parts of melamine, 15-30 parts of formaldehyde aqueous solution, 3-6 parts of p-toluenesulfonamide, 2-4 parts of curing agent, 2-4 parts of urea and 30-50 parts of water; the mass fraction of the formaldehyde aqueous solution is 37 wt%; the curing agent is prepared from the following components in percentage by weight: hexamethylenetetramine: phthalic anhydride is 1 (1-1.5): (1.6-2.4).
The preparation method of the melamine glue layer and the melamine glue filled with the shadowless glue net comprises the following steps:
(1) adding hexamethylenetetramine and phthalic anhydride into deionized water at 70-80 ℃, and stirring for 30-40min to obtain a curing agent;
(2) at the temperature of 35-40 ℃, adding melamine and urea into the stirred formaldehyde aqueous solution, heating to 80-90 ℃ within 45min while stirring, and then carrying out heat preservation reaction for 40-50 min. Then cooling to 50-60 ℃ to obtain a mixture A;
(3) adding p-toluenesulfonamide, nano alumina particles and water into the mixture A at 40-55 ℃, and stirring for 30-50min to obtain a mixture B;
(4) before coating, adding the curing agent prepared in the step (1) into the mixture B, uniformly stirring to prepare the melamine-formaldehyde composite adhesive, and coating or dipping.
The preparation method of the impregnated paper comprises the following steps:
(1) taking a raw paper layer, coating or completely dipping melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, respectively pressing a tensioned shadowless glue net prepared in advance into the melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, mechanically clamping the shadowless glue net on the upper and lower surfaces of the raw paper, scraping redundant melamine-formaldehyde composite glue on the surface of the shadowless glue net by using a scraper, drying the dipped paper by using a drying oven at the temperature of 120-;
(2) dipping the melamine-formaldehyde composite adhesive again, scraping the surface by using a scraper, and drying by using a drying oven at the temperature of 150-160 ℃, wherein the drying time is 5-10 minutes;
(3) and cooling the impregnated paper to room temperature, and then cutting according to requirements and specifications.
The invention has the following beneficial effects:
compared with the prior art, the invention has the beneficial effects of good hardness and toughness and strong impact resistance:
1. the shadowless adhesive net is fixed on two sides of the raw paper layer after the shadowless adhesive is fully soaked by the water absorption cotton thread/the water absorption silk thread and is solidified by ultraviolet irradiation. On one hand, the water-absorbing cotton thread/water-absorbing silk thread net is tensioned on four sides after fully absorbing the shadowless glue and respectively pressed into the well-coated melamine-formaldehyde composite glue from two sides of the paper, the shadowless glue net is primarily fixed by temporarily drying the melamine-formaldehyde composite glue, the shadowless glue is fixed into the silk thread net by fully irradiating with ultraviolet rays, and then the shadowless glue net and the melamine-formaldehyde composite glue form firm bonding by thoroughly drying. The base of the net layer is a tensioned net, so that the flexibility of the attached impregnated paper can be greatly improved under the condition of keeping tension, the impregnated paper is not easy to break, and meanwhile, the impact strength and the hardness of the impregnated paper can be enhanced by the net structure. On the other hand, the reason why the shadowless adhesive net covers the upper surface and the lower surface of the raw paper layer is that if the shadowless adhesive net covers only one side of the raw paper layer, the wire net is solidified under the condition of tensioning, so that the paper is easy to tilt from the edge to the center, the double-surface covering net not only can balance the tilting force of the edge to the center, but also can obviously improve the tensile strength of the impregnated paper in all directions because the shadowless adhesive net is solidified under the condition of tensioning and has prestress.
2. The water-absorbing cotton thread/water-absorbing silk thread adsorption shadowless glue has the advantages of extremely wide application range and excellent bonding effect on bonding of various materials such as plastics and the like; high adhesion strength, low temperature resistance, and high temperature and humidity resistance. The glue is stable and easy to store under the condition of no ultraviolet irradiation initiation, and the highest strength is achieved within a short time under the initiation of ultraviolet irradiation. On one hand, the melamine-formaldehyde composite adhesive can be well adhered and tightly fixed with melamine-formaldehyde composite adhesive filled into meshes of a shadowless adhesive net, after the shadowless adhesive is cured, the surface of the adhesive is in contact with air, and due to the inhibition effect of the air, the surface of the adhesive can not be debonded, and the adhesion degree of a melamine adhesive layer coated or impregnated subsequently can also be increased. On the other hand, the shadowless glue is a green, environment-friendly and economic chemical product, contains one hundred percent of solid content glue, has no VOC volatile matter, has no pollution to the ambient air, has low flammability, has no damage to the tension of the tensioned wire mesh while fixing the tensioned wire mesh, and does not produce any toxic, carcinogenic, pathogenic and denaturing hazards to human bodies while ensuring the lifting effect of the impregnated paper.
3. The formula of the shadowless adhesive is also added with a heat-conducting filler such as a carbon nano tube, so that the shadowless adhesive is high-temperature resistant and has excellent heat-conducting property. The advantages of the shadowless adhesive net are that the heat conductivity of the shadowless adhesive net is improved, heat is conducted fully when the oven is dried, and the heat can be uniformly transferred to the melamine-formaldehyde composite adhesive of the shadowless adhesive net and the glue of the melamine adhesive layer through the net-shaped structure, so that the shadowless adhesive net is fully solidified without dead angles.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Table 1 ratio table of different shadowless glue formulas
Shadowless glue net 1: (1) weighing the raw materials according to the weight percentage of the formula in the table 1;
(2) fully mixing epoxy acrylate and polyurethane acrylic resin at a stirring speed of 1000r/min, then sequentially adding a monomer, a photoinitiator and a heat-conducting filler, stirring for 30min to obtain shadowless glue water, and maintaining the stirring speed of a glue pool at 300 r/min;
(3) and (3) fully soaking a fine cotton wire mesh (made of common fibers, the diameter of the fine cotton wire mesh is 0.13mm, the mesh density is 8 meshes) into a glue pool filled with the shadowless glue water in the step (2) and continuously stirring, taking out after 10min, unfolding and tensioning to obtain the shadowless glue net.
Shadowless glue net 2: (1) weighing the raw materials according to the weight percentage of the formula in the table 1;
(2) fully mixing epoxy acrylate and polyurethane acrylic resin at a stirring speed of 1100r/min, then sequentially adding a monomer, a photoinitiator and a heat-conducting filler, stirring for 38min to obtain shadowless glue water, and maintaining the stirring speed of a glue pool at 400 r/min;
(3) and (3) fully soaking a fine cotton wire mesh (made of superfine fibers, the diameter of which is 0.10mm, and the mesh density of which is 18 meshes) into a glue pool filled with the shadowless glue water in the step (2) and continuously stirring, taking out after 15min, unfolding and tensioning to obtain the shadowless glue net.
Shadowless glue net 3: (1) weighing the raw materials according to the weight percentage of the formula in the table 1;
(2) fully mixing epoxy acrylate and polyurethane acrylic resin at a stirring speed of 1200r/min, then sequentially adding a monomer, a photoinitiator and a heat-conducting filler, stirring for 45min to obtain shadowless glue water, and maintaining the stirring speed of a glue pool at 500 r/min;
(3) and (3) fully soaking a fine cotton wire mesh (made of superfine fibers, the diameter of which is 0.08mm, and the mesh density of which is 28 meshes) into a glue pool filled with the shadowless glue water in the step (2) and continuously stirring, taking out after 20min, unfolding and tensioning to obtain the shadowless glue net.
A shadowless glue net 4: (1) weighing the raw materials according to the weight percentage of the formula in the table 1;
(2) fully mixing epoxy acrylate and polyurethane acrylic resin at a stirring speed of 1100r/min, then sequentially adding a monomer and a photoinitiator, stirring for 38min to obtain shadowless glue water, and maintaining the stirring speed of a glue pool at 400 r/min;
(3) and (3) fully soaking a fine cotton wire mesh (made of superfine fibers, the diameter of which is 0.10mm, and the mesh density of which is 18 meshes) into a glue pool filled with the shadowless glue water in the step (2) and continuously stirring, taking out after 15min, unfolding and tensioning to obtain the shadowless glue net.
Table 2 proportions of different melamine glue formulations
1 part of melamine glue: (1) weighing the raw materials according to the weight percentage of the formula in the table 2, adding hexamethylenetetramine and phthalic anhydride (the proportion of ionized water to hexamethylenetetramine to phthalic anhydride is 1: 1: 1.6) into deionized water at 70-80 ℃, and stirring for 30min to obtain a curing agent;
(2) at the temperature of 35 ℃, the melamine and the urea are added into the formaldehyde aqueous solution which is stirred, the temperature is raised to 80 ℃ within 45min while stirring, and then the temperature is preserved for reaction for 40 min. Then cooling to 50 ℃ to obtain a mixture A;
(3) adding p-toluenesulfonamide, nano alumina particles and water into the mixture A at 40 ℃, and stirring for 30min to prepare a mixture B;
(4) before coating, adding the curing agent prepared in the step (1) into the mixture B, uniformly stirring to prepare the melamine-formaldehyde composite adhesive, and coating or dipping.
Melamine glue 2: (1) weighing the raw materials according to the weight percentage of the formula in the table 2, adding hexamethylenetetramine and phthalic anhydride (the proportion of ionized water to hexamethylenetetramine to phthalic anhydride is 1: 1.3: 2.0) into deionized water at 75 ℃, and stirring for 30-40min to prepare the curing agent;
(2) at 38 ℃, adding melamine and urea into the stirred formaldehyde aqueous solution, heating to 85 ℃ within 45min while stirring, and then carrying out heat preservation reaction for 45 min. Then cooling to 55 ℃ to obtain a mixture A;
(3) adding p-toluenesulfonamide, nano alumina particles and water into the mixture A at 50 ℃, and stirring for 40min to prepare a mixture B;
(4) before coating, adding the curing agent prepared in the step (1) into the mixture B, uniformly stirring to prepare the melamine-formaldehyde composite adhesive, and coating or dipping.
Melamine glue 3: (1) weighing the raw materials according to the weight percentage of the formula in the table 2, adding hexamethylenetetramine and phthalic anhydride (the proportion of ionized water to hexamethylenetetramine to phthalic anhydride is 1: 1.5: 2.4) into deionized water at the temperature of 80 ℃, and stirring for 30-40min to prepare the curing agent;
(2) at 40 ℃, adding melamine and urea into the stirred formaldehyde aqueous solution, heating to 90 ℃ within 45min while stirring, and then carrying out heat preservation reaction for 50 min. Then cooling to 60 ℃ to obtain a mixture A;
(3) adding p-toluenesulfonamide, nano alumina particles and water into the mixture A at 55 ℃, and stirring for 50min to prepare a mixture B;
(4) before coating, adding the curing agent prepared in the step (1) into the mixture B, uniformly stirring to prepare the melamine-formaldehyde composite adhesive, and coating or dipping.
TABLE 3 materials for different examples and comparative examples
Example 1:
(1) taking a raw paper layer, coating or completely dipping melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, respectively pressing a tensioned shadowless glue net prepared in advance into the melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, mechanically clamping the shadowless glue net on the upper and lower surfaces of the raw paper, scraping redundant melamine-formaldehyde composite glue on the surface of the shadowless glue net by using a scraper, drying the dipped paper by using a drying oven at 120 ℃, wherein the drying time is 30 seconds, the melamine-formaldehyde composite glue is preliminarily solidified and fixed on the shadowless glue net, then irradiating and curing the shadowless glue net by using an ultraviolet lamp for 3 minutes, and then drying and curing the undried melamine-formaldehyde composite glue in the drying oven at 120 ℃ by using the dipped paper, so that a fixing clamp can be removed;
(2) dipping the melamine-formaldehyde composite adhesive again, scraping the surface by using a scraper, and drying by using a drying oven at 150 ℃ for 5 minutes.
(3) The impregnated paper was cooled to room temperature and cut as required and specified to obtain the impregnated paper of example 1.
Example 2:
(1) taking a raw paper layer, coating or completely dipping melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, respectively pressing a tensioned shadowless glue net prepared in advance into the melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, mechanically clamping the shadowless glue net on the upper and lower surfaces of the raw paper, scraping redundant melamine-formaldehyde composite glue on the surface of the shadowless glue net by using a scraper, drying the dipped paper by using a 135 ℃ drying oven for 45 seconds to enable the melamine-formaldehyde composite glue to be preliminarily solidified and fixed on the shadowless glue net, irradiating and curing the shadowless glue net by using an ultraviolet lamp for 6 minutes, and then drying and curing the undried melamine-formaldehyde composite glue in the 135 ℃ drying oven by using the dipped paper, so that a fixing clamp can be removed;
(2) dipping the melamine-formaldehyde composite adhesive again, scraping the surface by using a scraper, and drying by using an oven at 155 ℃ for 8 minutes;
(3) and cooling the impregnated paper to room temperature, and then cutting according to requirements and specifications.
Example 3:
(1) taking a raw paper layer, coating or completely dipping melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, respectively pressing a tensioned shadowless glue net prepared in advance into the melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, mechanically clamping the shadowless glue net on the upper and lower surfaces of the raw paper, scraping redundant melamine-formaldehyde composite glue on the surface of the shadowless glue net by using a scraper, drying the dipped paper by using a drying oven at 150 ℃, wherein the drying time is 60 seconds, the melamine-formaldehyde composite glue is preliminarily solidified and fixed on the shadowless glue net, then irradiating and curing the shadowless glue net by using an ultraviolet lamp for 8 minutes, and then drying and curing the undried melamine-formaldehyde composite glue in the drying oven at 150 ℃ by using the dipped paper, so that a fixing clamp can be removed;
(2) dipping the melamine-formaldehyde composite adhesive again, scraping the surface by using a scraper, and drying by using a drying oven at 160 ℃ for 10 minutes;
(3) and cooling the impregnated paper to room temperature, and then cutting according to requirements and specifications.
Examples 4 to 5 and comparative example were prepared by the same method as in example 2.
And (3) performance test aspects: impregnated papers were prepared according to the methods of examples 1 to 5 and comparative examples, and the properties of the impregnated papers thus prepared were measured according to the following methods, and the results are shown in Table 4:
1. impact resistance, setting a blank artificial board group with the size of 300.0 x 180.0 and without impregnated paper, setting 3 pieces of impregnated paper with the size of 300.0 x 180.0 cut in each group to be compounded on the same artificial board to manufacture 3 standard parts, and arranging a cushion layer (made of foamed polyethylene, the breadth is 300 × 300mm, the thickness is 2.5 +/-0.2 mm, and the surface density is 75 g/m)2) The sample was placed on a smooth floor in a horizontal position, the impregnated paper was placed on the mat with the paper facing up, and a blue copy paper was placed on the decorative surface of the sample. The steel ball (diameter 42.8 +/-0.2 mm, mass 324.0 +/-5.0 g, smooth spherical surface, no concave damage, rust spot and other defects) is dropped freely from the height of 1.75m to impact the surface of the test piece (to prevent the steel ball from jumping repeatedly on the surface of the test piece), each test piece is tested only once, and the dropping point of the steel ball is within 2.5mm from the center point of the test piece. The diameter of the pit was measured to 0.1mm with a vernier caliper.
Tensile strength properties: a blank set was set without using a shadowless adhesive net to impregnate only two layers of melamine-formaldehyde composite adhesive of the same thickness, 3 pieces of impregnated paper samples were set for each of the examples and the comparative examples, and the tensile strength of the paper was measured by a tensile strength tester.
TABLE 4 results of testing the properties of examples 1-5, control and blank groups
From the experimental results in table 4 we can see that:
in combination with the comparison of the blank, control and examples 1-5, we can find that the addition of the shadowless adhesive web provides a significant improvement in tensile strength (toughness) and impact resistance (hardness) of the impregnated paper, and in particular, the effect of the application of a tensioned shadowless adhesive web on both sides of the impregnated paper on the performance enhancement of the impregnated paper is verified from the comparison of the control and blank. In these cases, the best performance is example 3 followed by example 4, and the performance is not much different from that of example 3, and the best suitable production example can be determined according to the actual demand for impregnated paper and the cost. In addition, the melamine glue layer can also be added with wear-resistant components, high-gloss components, green and environment-friendly aldehyde-removing components and the like, or the melamine glue layer is dipped and coated with other functional and decorative coatings.
Comparing the comparative example and example 2, it can be seen that the addition of the heat conductive filler (carbon nanotubes) in the shadowless glue formulation significantly improves the impact resistance and tensile strength of the impregnated paper by sufficiently conducting heat.
Comparing examples 1-3, it can be seen that the impact resistance and tensile strength of the prepared impregnated paper are gradually increased, and considering from the shadowless adhesive net, on one hand, the base net of the shadowless adhesive net has stronger water absorption and toughness than the common fiber, and can absorb more shadowless adhesive to make the net tougher and firmer; on the other hand, the mesh density of the shadowless adhesive net also influences the strength and toughness of the adhesive net, and the denser mesh can improve the impact resistance and tensile strength of the prepared impregnated paper.
Compared with examples 2-5, it can be found that under the condition that the shadowless adhesive net is the same, the melamine-formaldehyde composite adhesive used by the shadowless adhesive net and the melamine adhesive layer have different formulas, and have influence on the performance of the prepared impregnated paper, but the influence is smaller compared with the shadowless adhesive net, which indicates that if a higher-quality impregnating coating formula is used, the strength and toughness of the impregnated paper can be better improved, and the further improvement can be performed according to actual needs.
Claims (9)
1. An impregnated paper characterized by: the impregnated paper is impregnated on both sides and comprises a raw paper layer and melamine glue layers attached to both sides of the raw paper layer; the raw paper layer is raw paper or balance paper; a shadowless adhesive net is embedded in the melamine adhesive layer; the shadowless adhesive net comprises a fine cotton wire net or a silk wire net which is soaked with shadowless adhesive and then cured by ultraviolet irradiation; the melamine glue is mainly prepared by compounding melamine and formaldehyde.
2. Impregnated paper according to claim 1, characterized in that: the shadowless adhesive formula used for the shadowless adhesive net comprises the following components in parts by weight: 40-60 parts of prepolymer, 20-40 parts of monomer, 4-8 parts of photoinitiator and 15-25 parts of curing agent.
3. The shadowless adhesive formulation of claim 2 wherein: the formula of the shadowless adhesive also comprises 3-6 parts of heat-conducting filler; the prepolymer comprises epoxy acrylate and polyurethane acrylic resin in a ratio of (1:1) - (1: 3); the monomer is one or more of isobornyl acrylate, tripropylene glycol diacrylate and trimethylolpropane triacrylate; the photoinitiator is 2,4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO) or benzophenone; the heat conducting filler is carbon nano tube.
4. Impregnated paper according to claim 1, characterized in that: the fine cotton wire net or silk wire net used by the shadowless adhesive net is water-absorbing cotton wire or water-absorbing silk wire, the diameter is 0.08-0.13mm, and the mesh density is 8-28 meshes.
5. Impregnated paper according to claim 4, characterized in that: the fine cotton wire net or silk wire net used by the shadowless adhesive net is made of superfine fibers, and the diameter of the fine cotton wire net or silk wire net is 0.10 mm.
6. Impregnated paper according to claim 3, characterized in that: the shadowless glue net is prepared by the following method:
(1) weighing the raw materials according to the weight percentage of the formula;
(2) at the stirring speed of 1200r/min, firstly, fully mixing the epoxy acrylate and the polyurethane acrylic resin, then sequentially adding the monomer, the photoinitiator and the heat-conducting filler, stirring for 30-45min to obtain the shadowless glue, and maintaining the stirring speed of 300 + 500r/min in a glue pool;
(3) and (3) fully soaking the fine cotton wire mesh or the silk wire mesh in a glue pool filled with the shadowless glue water obtained in the step (2), taking out after 10-20min, unfolding and tensioning to obtain the shadowless glue net.
7. Impregnated paper according to claim 1, characterized in that: the melamine glue layer comprises the following raw materials in parts by weight: 5-10 parts of melamine, 15-30 parts of formaldehyde aqueous solution, 3-6 parts of p-toluenesulfonamide, 2-4 parts of curing agent, 2-4 parts of urea and 30-50 parts of water; the mass fraction of the formaldehyde aqueous solution is 37 wt%; the curing agent is prepared from the following components in percentage by weight: hexamethylenetetramine: phthalic anhydride is 1 (1-1.5): (1.6-2.4).
8. Impregnated paper according to claim 7, characterized in that: the preparation method of the melamine glue layer comprises the following steps:
(1) adding hexamethylenetetramine and phthalic anhydride into deionized water at 70-80 ℃, and stirring for 30-40min to obtain a curing agent;
(2) at the temperature of 35-40 ℃, adding melamine and urea into the stirred formaldehyde aqueous solution, heating to 80-90 ℃ within 45min while stirring, and then carrying out heat preservation reaction for 40-50 min. Then cooling to 50-60 ℃ to obtain a mixture A;
(3) adding p-toluenesulfonamide, nano alumina particles and water into the mixture A at 40-55 ℃, and stirring for 30-50min to obtain a mixture B;
(4) before coating, adding the curing agent prepared in the step (1) into the mixture B, uniformly stirring to prepare the melamine-formaldehyde composite adhesive, and coating or dipping.
9. A process for preparing impregnated paper according to claims 1-8, characterized in that: the method comprises the following steps:
(1) taking a raw paper layer, coating or completely dipping melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, respectively pressing a tensioned shadowless glue net prepared in advance into the melamine-formaldehyde composite glue on the upper and lower surfaces of the raw paper layer, mechanically clamping the shadowless glue net on the upper and lower surfaces of the raw paper, scraping redundant melamine-formaldehyde composite glue on the surface of the shadowless glue net by using a scraper, drying the dipped paper by using a drying oven at the temperature of 120-;
(2) dipping the melamine-formaldehyde composite adhesive again, scraping the surface by using a scraper, and drying by using a drying oven at the temperature of 150-160 ℃, wherein the drying time is 5-10 minutes;
(3) and cooling the impregnated paper to room temperature, and then cutting according to requirements and specifications.
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| CN115182201A (en) * | 2022-06-16 | 2022-10-14 | 东莞市高益装饰材料有限公司 | Silver powder impregnated paper and production process thereof |
| CN116005485A (en) * | 2022-12-29 | 2023-04-25 | 福建省闽清双棱纸业有限公司 | High-strength impregnated paper and preparation method thereof |
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