CN111364281A - Melamine impregnated paper containing polyurethane coating, preparation method and application thereof - Google Patents
Melamine impregnated paper containing polyurethane coating, preparation method and application thereof Download PDFInfo
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- CN111364281A CN111364281A CN202010295041.3A CN202010295041A CN111364281A CN 111364281 A CN111364281 A CN 111364281A CN 202010295041 A CN202010295041 A CN 202010295041A CN 111364281 A CN111364281 A CN 111364281A
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- melamine
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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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- 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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
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Abstract
The invention relates to melamine impregnated paper containing a polyurethane coating, a preparation method and application thereof, wherein the melamine impregnated paper comprises printing paper subjected to melamine resin impregnation treatment, and the polyurethane coating is arranged on one surface of the printing paper subjected to the melamine impregnation treatment; the polyurethane coating is prepared from the following raw materials in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide and 0.2-0.4 part of release agent. The adhesive force between the melamine impregnated paper containing the polyurethane coating and the base material is improved, and the polyurethane coating is firmly attached to the first melamine resin layer and the base material, so that the service life of the melamine impregnated paper containing the polyurethane coating is greatly prolonged; the polyurethane coating can be well spread on the front surface of the melamine resin by the aid of the added alkali swelling rheological additive, and the adhesive force of the pressed polyurethane coating and the printing paper subjected to melamine resin impregnation treatment is good.
Description
Technical Field
The invention relates to the technical field of decorative materials, in particular to melamine impregnated paper containing a polyurethane coating, a preparation method and application thereof.
Background
The melamine board, which is fully called melamine impregnated bond paper veneer artificial board, is a decorative board obtained by soaking printing paper with different colors or textures in melamine resin adhesive, drying to a certain curing degree, paving the paper on the surface of base materials such as shaving boards, fireproof boards, medium-density fiberboards, plywood, blockboards, multilayer boards or other hard fiberboards, and carrying out hot pressing. The melamine board has the advantages of excellent scratch resistance, heat resistance, corrosion resistance, pollution resistance and the like, and is widely used in the field of decorative buildings.
The current melamine board adopts a spray painting manufacturing method: spraying a layer of primer on the melamine board polished to a certain roughness, then spraying a plurality of layers of finish paint, and baking and shaping at high temperature. The products prepared by the method are bright and full in color, but the attractiveness of the products depends on the quality of polishing quality to a great extent, manual dusty polishing is usually adopted when the melamine boards are polished to the use degree, the dust in the melamine resin contains formaldehyde during polishing operation, if the formaldehyde is absorbed into a body, the body is greatly damaged, polishing defects such as local scratch and local dent of the melamine boards caused by abrasive materials, tools and operation problems exist during polishing operation of polishing workers, and coating defects are caused when primer and finish coatings in subsequent steps cannot be covered. The manufacturing method of the melamine board in the market does not need to polish: the method is mainly used for directly spraying the primer for construction without polishing the melamine board, the melamine resin is not polished, the efficiency is improved, but the melamine resin layer after being completely cured is thermosetting resin, the polishing-free primer is directly sprayed without polishing, the adhesion performance of a primer product after being polished cannot be achieved, the primer is easily separated from the melamine resin layer after being completely cured in the using process of the obtained product, and the experience of a user is poor.
Disclosure of Invention
The invention aims to provide melamine impregnated paper containing a polyurethane coating, and solves the technical problems of poor adhesion and short service life of the existing melamine impregnated paper.
The second purpose of the invention is to provide a preparation method of melamine impregnated paper containing a polyurethane coating, which solves the technical problem of complex operation steps in the existing preparation process of the melamine impregnated paper.
One of the purposes of the invention is to provide application of melamine impregnated paper containing a polyurethane coating, and solve the technical problem that the existing melamine impregnated paper is easy to cause harm to human bodies because a polishing process is needed after hot pressing to a base material.
In order to achieve the purpose, the invention provides melamine impregnated paper containing a polyurethane coating, which comprises printing paper subjected to melamine resin impregnation treatment, wherein the polyurethane coating is arranged on one side of the printing paper subjected to the melamine impregnation treatment; the polyurethane coating is prepared from the following raw materials in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide and 0.2-0.4 part of release agent.
Preferably, a melamine resin layer is further coated on the other surface of the melamine resin impregnated printing paper.
Preferably, the raw materials for preparing the polyurethane coating also contain 0.5-1 part by weight of fluorocarbon surfactant.
Preferably, the aqueous resin is at least one of an aqueous acrylic emulsion and an aqueous polyurethane emulsion.
Preferably, the alkali swell rheology aid is an anionic acrylic polymer.
Preferably, the melamine resin comprises the following components in parts by weight: 100-200 parts of melamine, 180-220 parts of formaldehyde solution, 5-10 parts of caprolactam, 1-3 parts of triethanolamine, 5-10 parts of diethylene glycol and 80-100 parts of water; the melamine resin also comprises a curing agent, a release agent and a dedusting agent, wherein the curing agent is 0.2 part, the release agent is 0.2 part and the dedusting agent is 0.3 part based on 100 parts by weight of the melamine resin.
Preferably, the curing agent is compounded by morpholine, p-toluenesulfonic acid and water, and the weight ratio of the morpholine to the p-toluenesulfonic acid to the water is 1:2: 3.
The invention also provides a method for preparing the melamine impregnated paper with the polyurethane coating, which comprises the steps of impregnating the printing paper with the prepared melamine resin, drying the printing paper for the first step to obtain the printing paper impregnated with the melamine resin, and coating the polyurethane resin on one surface of the printing paper impregnated with the melamine resin, wherein the polyurethane resin comprises the following components in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide, 0.5-1 part of fluorocarbon surfactant and 0.2-0.4 part of release agent, and drying the mixture in the second step to obtain the melamine impregnated paper containing the polyurethane coating.
Preferably, the method specifically comprises the following steps:
step 1: the printing method comprises the following steps of gumming, namely mixing 100-200 parts by weight of melamine, 180-220 parts by weight of formaldehyde solution, 5-10 parts by weight of caprolactam, 1-3 parts by weight of triethanolamine, 5-10 parts by weight of diethylene glycol and 80-100 parts by weight of water to prepare melamine resin, and then dipping printing paper in the melamine resin;
step 2: step one, drying, namely taking out the printing paper subjected to the melamine resin impregnation treatment in the step 1, and controlling the dry weight of the melamine resin impregnated on the printing paper to be 100-200g/m when the printing paper is taken out2Then drying at 110-150 ℃;
and step 3: coating polyurethane resin on one surface of the printing paper subjected to the melamine resin impregnation treatment, and coating the melamine resin prepared in the step 1 on the other surface of the printing paper, wherein the polyurethane resin comprises the following components in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide, 0.5-1 part of fluorocarbon surfactant and 0.2-0.4 part of release agent, wherein the dry weight of the polyurethane resin is 10-30 g/m2Said threeThe dry weight of the polycyanate amine resin is 40-90g/m2；
And 4, step 4: secondly, drying, namely drying the printing paper coated with the polyurethane resin and the melamine resin in the step 3 at 100-140 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine dipped paper containing the polyurethane coating obtained by the second step of drying in the step 4 into the required specification and detecting according to the preset standard.
The invention also provides application of the melamine impregnated paper with the polyurethane coating in preparation of a melamine board, and the melamine impregnated paper with the polyurethane coating and a base material are subjected to hot pressing to obtain the melamine board, wherein the hot pressing temperature is 140-185 ℃, the hot pressing pressure is 16-20MPa, and the hot pressing time is 15-20 s.
The melamine impregnated paper containing the polyurethane coating, the preparation method and the application of the melamine impregnated paper have the beneficial effects that:
1. the melamine impregnated paper with the polyurethane coating comprises the polyurethane coating, the first melamine resin layer, the printing paper and the second melamine resin layer, so that the adhesive force between the melamine impregnated paper with the polyurethane coating and the base material is improved, the polyurethane coating is firmly attached to the first melamine resin layer and the base material, and the service life of the melamine impregnated paper with the polyurethane coating is greatly prolonged. The polyurethane coating can be well spread on the front surface of the melamine resin by the aid of the added alkali swelling rheological additive, and the adhesive force of the polyurethane coating and the printing paper subjected to melamine resin impregnation treatment is good after the polyurethane coating is pressed and attached; the added fluorocarbon surfactant has higher surface activity, so that the surface tension of the polyurethane coating is reduced, and the wetting capacity of the polyurethane coating is improved, so that the polyurethane coating can be well coated on the printing paper subjected to the melamine dipping treatment, and the adhesive force of the polyurethane coating and the printing paper subjected to the melamine dipping treatment is further improved.
2. The printing paper is soaked in melamine resin through a glue dipping device, a first melamine resin layer is formed on the upper surface and the lower surface of the printing paper after the printing paper is dried, then a polyurethane coating is roll-coated on the first melamine resin layer at the upper end of the printing paper, a layer of melamine resin is roll-coated on the lower end of the printing paper, and after the second time, the polyurethane coating is firmly attached to the cured first melamine resin layer. The polyurethane coating melamine impregnated paper disclosed by the invention does not need to be polished after being hot-pressed to a base material, can be directly coated with polyurethane finish paint or polyurethane colored paint, saves the labor cost, is simpler in operation step, greatly improves the production efficiency, can improve the adhesion between the polyurethane coating and the base material and the first melamine resin layer, and also improves the alkali resistance, the anticorrosion function and the like of the polyurethane coating melamine impregnated paper.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the melamine impregnated paper with a polyurethane coating according to the present invention.
The reference numbers illustrate: 1-printing paper impregnated with melamine resin, 2-melamine resin layer, and 3-polyurethane coating.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
It should be noted that if directional indications such as up, down, left, right, front, and rear … … are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship, motion, and the like between the components in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indications are changed accordingly. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a melamine-dipped paper with a polyurethane coating, which comprises a printing paper 1 treated by dipping melamine resin, wherein a polyurethane coating 2 is arranged on one side of the printing paper treated by dipping melamine resin; the polyurethane coating 2 is prepared from the following raw materials in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide and 0.2-0.4 part of release agent.
In the embodiment, the melamine impregnated paper containing the polyurethane coating is used on the surfaces of various furniture, and has the characteristics of excellent scratch resistance, heat resistance, corrosion resistance, pollution resistance and the like, and different printing papers can be replaced on the surfaces of the furniture to meet various decoration requirements of customers, so that the melamine impregnated paper is widely used.
The melamine impregnated paper containing the polyurethane coating in the embodiment comprises the polyurethane coating 2 and the printing paper 1 impregnated by the melamine resin, the printing paper can be changed into different styles and appearances, and has a good decoration effect, the printing paper is wrapped in the melamine resin impregnated printing paper to play a role in protection, but the melamine resin impregnated printing paper 1 can be stripped from the base material to lose efficacy due to the fact that the adhesive force between the melamine resin and the base material is reduced after the melamine resin impregnated printing paper 1 is used for a period of time, so that the polyurethane coating 2 is arranged to improve the adhesive force between the melamine impregnated printing paper and the base material, the polyurethane coating 2 is firmly attached to the melamine resin impregnated printing paper 1 and the base material, and the service life of the melamine impregnated paper containing the polyurethane coating is greatly prolonged. Specifically, the raw materials for preparing the polyurethane coating 2 comprise 70-90 parts of water-based resin and 20-30 parts of water, the water-based resin is used as the main component of the coating, the density of the water-based resin is small, the self weight is light, and the water-based resin has the advantages of high hardness, high elasticity, corrosion resistance and wear resistance, the prepared polyurethane coating 2 can ensure long service life when used as a surface layer material, and the water is added into the polyurethane coating 2 to properly improve the fluidity of the water-based resin, so that the polyurethane coating is easier to coat and level. In addition, 2-3 parts of alkali swelling rheological additive is added into the polyurethane coating 2, so that the polyurethane coating 2 can be well spread on the front surface of melamine resin, and the adhesive force between the polyurethane coating and the printing paper 1 subjected to melamine resin impregnation treatment is good after pressing; and meanwhile, a defoaming agent is added to reduce bubbles of the polyurethane coating 2 in use, influence the quality of the polyurethane coating 2 on the surface layer and shorten the service life of the melamine impregnated paper containing the polyurethane coating, and the defoaming agent is specifically emulsified silicone oil. In addition, the polyurethane coating 2 is also added with an antiseptic bactericide, so that the accumulation of bacteria can be avoided in daily use, the influence on the identity health of a user can be avoided, the antiseptic bactericide can be selected from a mixture of quaternary ammonium salt and isothiazolinone compounds, the sterilization effect is good, and the active part on the heterocycle and the basic group of DNA in protein in the bacteria form a hydrogen bond and are adsorbed on the cells of the bacteria, so that the structure of the DNA in the cells is damaged, the replication capacity of the DNA is lost, and the cells are dead. The release agent is added to facilitate removal of the polyurethane resin from the mold. The components do not contain filler, the polyurethane coating 2 on the surface layer is transparent, and the printing lines of the internal printing paper are not influenced.
Further, a melamine resin layer 3 is coated on the other surface of the melamine resin impregnated printing paper 1. The bottom end of the printing paper 1 which is subjected to the melamine resin dipping treatment is further coated with the melamine resin layer 3, so that the printing paper is better protected, and the service life of the melamine dipped paper containing the polyurethane coating is further prolonged.
Furthermore, the raw materials for preparing the polyurethane coating 2 also contain 0.5-1 part by weight of fluorocarbon surfactant. Because the melamine resin layer 3 and the printing paper 1 subjected to melamine dipping are different in resin system and the surface tension of the polyurethane coating 2 is larger, the polyurethane coating 3 is directly roller-coated on the surface of the printing paper 1 subjected to melamine dipping, and the phenomena of shrinkage, poor wetting and the like are easily caused, so that 0.5-1 part of fluorocarbon surfactant is added into the polyurethane resin, the surface activity is higher, the surface tension of the polyurethane coating 2 is reduced, the wetting capability of the polyurethane coating is improved, the polyurethane coating 2 can be well coated on the printing paper 1 subjected to melamine dipping, and the adhesive force of the polyurethane coating 2 and the printing paper 1 subjected to melamine dipping is further improved.
Further, the aqueous resin is at least one of aqueous acrylic emulsion and aqueous polyurethane emulsion. The single-component water-based acrylic emulsion has good weather resistance, glossiness and hardness, and is not easy to yellow; the aqueous polyurethane emulsion with single component has better flexibility, fatigue resistance and glossiness. When the two are combined, the dehydration condensation reaction between the hydrazine group in the aqueous polyurethane emulsion and the copper carbonyl group in the aqueous acrylic emulsion promotes the crosslinking between the hydrazine group and the copper carbonyl group, so that the heat resistance, the water resistance and the like of the aqueous resin are improved, and the mechanical and chemical properties are more excellent.
Further, the alkali swell rheology aid is an anionic acrylic polymer. Thus, in the structure using acrylate as a main chain, since the reactive association monomer with surface activity is introduced to participate in copolymerization, the side chain is grafted with a long chain with surface activity, and the long chain structure has both hydrophobic and hydrophilic groups, and thus has surface activity, and they can form a micelle structure in water. In addition, hydrophilic chains in the main chain and the side chains can be adsorbed with water molecules under the action of hydrogen bonds, and hydrophobic groups can be adsorbed with lipophilic groups of other assistants in the components to form a three-dimensional network structure, so that the rheological property of the polyurethane resin is improved, and the adhesive force of the polyurethane resin and the melamine resin is improved. Due to the fact that the melamine resin shifts to the acid value along with the lapse of preparation time, the pH of the closed polyurethane resin layer 2 is initially alkaline, the alkali swelling rheological additive has strong thixotropy at the moment, and after the alkali swelling rheological additive is sprayed to the front surface of printing paper, the pH value can shift to the acid value under the action of the melamine resin curing agent, so that the thickening effect of the closed primer is greatly reduced, and the leveling property is improved.
Further, the melamine resin comprises the following components in parts by weight: 100-200 parts of melamine, 180-220 parts of formaldehyde solution, 5-10 parts of caprolactam, 1-3 parts of triethanolamine, 5-10 parts of diethylene glycol and 80-100 parts of water; the melamine resin also comprises a curing agent, a release agent and a dedusting agent, wherein the curing agent is 0.2 part, the release agent is 0.2 part and the dedusting agent is 0.3 part based on 100 parts by weight of the melamine resin.
The melamine resin mainly comprises melamine and formaldehyde solution, the melamine and formaldehyde solution generate macromolecular melamine formaldehyde resin after polycondensation, the melamine formaldehyde resin is colorless and transparent after being cured, the decorative effect of the printing paper 1 subjected to melamine impregnation treatment is not influenced, the melamine formaldehyde resin still has good stability under the condition of high temperature (below 150 ℃), and meanwhile, the melamine formaldehyde resin has good mechanical property, has high hardness after being wrapped on the surface of the printing paper, and plays a good role in protecting the printing paper. 80-100 parts of water is added as a solvent in the melamine resin, so that the fluidity and the dispersion effect of the melamine resin are improved. Because the melamine impregnated paper containing the polyurethane coating needs to be subjected to hot pressing treatment after being subsequently combined with a base material, and the melamine formaldehyde resin is relatively fragile and is easy to have fine microcracks after hot pressing or after being used for a period of time, 5-10 parts of caprolactam is required to be added as a modifier, so that the stability and flexibility of the melamine formaldehyde resin are improved, and meanwhile, the melamine resin also contains triethanolamine and diethylene glycol, and the triethanolamine is used as a cationic modifier of the melamine formaldehyde resin, so that the melamine formaldehyde resin has electropositivity and can be cured quickly, the phenomenon that melamine and formaldehyde solution are further crosslinked to form gel is avoided, and the added diethylene glycol prolongs the storage time of the melamine resin layer.
The melamine resin is added with more water as a solvent, so that a proper amount of curing agent is added to facilitate the rapid curing of the melamine resin, the components are also added with a release agent and a dedusting agent to facilitate the demolding of the melamine formaldehyde resin and the dedusting effect in the preparation process of the melamine formaldehyde resin, the curing agent can be specifically morpholine and the like, the release agent can be any one or the combination of fatty acid, paraffin, silicone oil, polyethylene glycol and low molecular weight polyethylene, and the dedusting agent is selected from stearic acid amide dedusting agent and the like.
Further, the curing agent is compounded by morpholine, p-toluenesulfonic acid and water, wherein the weight ratio of the morpholine to the p-toluenesulfonic acid to the water is 1:2: 3. The p-toluenesulfonic acid and morphine in the curing agent can react in an aqueous solution, the finally prepared curing agent has good performance, no air bubbles are generated when the curing agent is soaked on the surface of printing paper, the pot life after glue mixing can reach 24 hours, and the hot pressing time is shortened to 15-20 s.
In addition, the invention also provides a method for preparing melamine impregnated paper containing a polyurethane coating, which comprises the steps of impregnating printing paper with pre-prepared melamine resin, drying the printing paper for the first step to obtain the printing paper subjected to melamine resin impregnation treatment, and coating polyurethane resin on one surface of the printing paper subjected to melamine impregnation treatment, wherein the polyurethane resin comprises the following components in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide, 0.5-1 part of fluorocarbon surfactant and 0.2-0.4 part of release agent, and drying the mixture in the second step to obtain the melamine impregnated paper containing the polyurethane coating.
Specifically, printing paper is soaked in melamine resin through a dipping device, so that melamine layers are formed on the upper surface and the lower surface of the printing paper, and the printing paper needs to be dried once after dipping, specifically, the melamine dipping paper with the pre-curing rate of 35-45% can be obtained by drying through an oven, then polyurethane resin is coated on one surface of the printing paper subjected to melamine resin soaking treatment in a roller manner, melamine resin is coated on the other surface of the printing paper, after secondary drying, the polyurethane coating 2 and the melamine resin layer 3 are firmly attached to the printing paper 1 subjected to melamine resin dipping treatment and subjected to basic curing, and at the moment, the curing degree of the melamine dipping paper of the polyurethane coating is 95%. The melamine impregnated paper containing the polyurethane coating prepared by the invention can be directly coated with polyurethane finish paint or polyurethane colored paint without polishing in the bonding process of the melamine impregnated paper and the base material, so that the labor cost is saved, the operation steps are simpler, the production efficiency is greatly improved, the polyurethane resin can improve the adhesive force of the polyurethane coating 2 and the base material and the printing paper 1 subjected to melamine resin impregnation treatment, and the alkali resistance, the anticorrosion function and the like of the melamine impregnated paper containing the polyurethane coating are improved.
Further, the method specifically comprises the following steps: step 1: the printing method comprises the following steps of gumming, namely mixing 100-200 parts by weight of melamine, 180-220 parts by weight of formaldehyde solution, 5-10 parts by weight of caprolactam, 1-3 parts by weight of triethanolamine, 5-10 parts by weight of diethylene glycol and 80-100 parts by weight of water to prepare melamine resin, and then dipping printing paper in the melamine resin; step 2: step one, drying, namely taking out the printing paper subjected to the melamine resin impregnation treatment in the step 1, and controlling the dry weight of the melamine resin impregnated on the printing paper to be 100-200g/m when the printing paper is taken out2Then drying at 110-150 ℃; and step 3: coating polyurethane resin on one surface of the printing paper subjected to the melamine resin impregnation treatment, and coating the melamine resin prepared in the step 1 on the other surface of the printing paper, wherein the polyurethane resin comprises the following components in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide, 0.5-1 part of fluorocarbon surfactant and 0.2-0.4 part of release agent, wherein the dry weight of the polyurethane resin is 10-30 g/m2The dry weight of the melamine resin is 40-90g/m2(ii) a And 4, step 4: secondly, drying, namely drying the printing paper coated with the polyurethane resin and the melamine resin in the step 3 at 100-140 ℃; and 5: cutting and detecting, and trimerizing the polyurethane-containing coating obtained by the second drying step in the step 4Cutting the cyanamide dipping paper into required specifications and detecting according to a preset standard. The components of the melamine resin impregnated on the surface of the printing paper are consistent with those of the melamine resin coated on the bottom layer, and the solid content of the melamine resin is 50%; the dry weights of the two are different and are respectively 100-200g/m2And 40-90g/m2Wherein the melamine resin in direct contact with the polyurethane coating 2 has a large wet weight, which facilitates adhesion with the polyurethane coating 2. The melamine resin impregnated on the surface of the printing paper is used for filling the interior of the printing paper, so that the using amount is larger, the gluing amount is larger when the dry weight is larger, and the melamine resin coated on the bottom layer is mainly hot-pressed on the base material, and the dry weight is 40-90g/m considering that the surface of the base material can have unevenness2The gluing amount is most suitable.
In addition, the invention also provides application of the melamine impregnated paper containing the polyurethane coating in preparation of a melamine board, which is characterized in that the melamine impregnated paper containing the polyurethane coating and a base material are subjected to hot pressing to obtain the melamine board, wherein the hot pressing temperature is 140-185 ℃, the hot pressing pressure is 16-20MPa, and the hot pressing time is 15-20 s.
According to the melamine impregnated paper containing the polyurethane coating, the polyurethane coating 2 is not required to be polished after being hot-pressed to the base material, the polyurethane finish paint or the polyurethane colored paint can be directly coated, the operation steps are simpler, and the production efficiency is greatly improved. Specifically, under the hot-pressing conditions of the hot-pressing temperature of 140-185 ℃, the hot-pressing pressure of 16-20MPa and the hot-pressing time of 15-20s, the base material and the melamine impregnated paper with the polyurethane coating are hot-pressed, so that the melamine impregnated paper with the polyurethane coating reaches the final curing, wherein the hot-pressing temperature is set to 140-185 ℃, the polyurethane coating 2, the melamine resin layer 3 and the printing paper 1 subjected to melamine impregnation are completely cured, and the melamine impregnated paper with the polyurethane coating cannot be damaged due to overhigh temperature.
The technical solutions of the present invention are further described in detail with reference to the following specific examples, which should be understood as merely illustrative and not limitative.
Example 1
Preparing melamine impregnated paper containing a polyurethane coating:
step 1: firstly, mixing 168 parts of melamine, 200 parts of formaldehyde solution, 7 parts of caprolactam, 3 parts of triethanolamine, 5 parts of diethylene glycol, 100 parts of water, 1 part of curing agent (morpholine 1/6, p-toluenesulfonic acid 1/3 and water 1/2), 1 part of release agent and 1.4 parts of dedusting agent according to parts by weight to prepare melamine resin, and then soaking printing paper in the melamine resin;
step 2: first step drying, taking out the printing paper which is subjected to the melamine resin impregnation treatment in the step 1, and controlling the dry weight of the melamine resin impregnated on the printing paper to be 115g/m when the printing paper is taken out2Then drying at 130 ℃;
and step 3: coating polyurethane resin on one surface of the printing paper subjected to the melamine resin impregnation treatment, and coating the melamine resin prepared in the step 1 on the other surface of the printing paper, wherein the polyurethane resin comprises the following components in parts by weight: 80 parts of water-based resin (60% of water-based acrylic emulsion and 40% of water-based polyurethane emulsion), 1 part of defoaming agent, 25 parts of water, 2 parts of alkali swelling rheological additive, 0.5 part of antiseptic bactericide, 0.5 part of fluorocarbon surfactant and 0.4 part of release agent, wherein the dry weight of the polyurethane resin is 20g/m2The dry weight of the melamine resin is 75g/m2；
And 4, step 4: secondly, drying, namely drying the printing paper coated with the polyurethane resin and the melamine resin in the step 3 at 120 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine dipped paper containing the polyurethane coating obtained by the second step of drying in the step 4 into the required specification and detecting according to the preset standard.
Preparing a melamine board:
and carrying out hot pressing on the melamine impregnated paper containing the polyurethane coating and a base material to obtain the melamine board, wherein the hot pressing temperature is 145 ℃, the hot pressing pressure is 18MPa, and the hot pressing time is 19 s.
Example 2
Preparing melamine impregnated paper containing a polyurethane coating:
step 1: the method comprises the following steps of gumming, namely firstly mixing 200 parts of melamine, 220 parts of formaldehyde solution, 5 parts of caprolactam, 2 parts of triethanolamine, 7 parts of diethylene glycol, 90 parts of water, 1 part of curing agent (morpholine 1/6, p-toluenesulfonic acid 1/3 and water 1/2), 1 part of release agent and 1.6 parts of dedusting agent according to parts by weight to prepare melamine resin, and then dipping printing paper in the melamine resin;
step 2: drying in the first step, taking out the printing paper which is subjected to the melamine resin impregnation treatment in the step 1, and controlling the wet weight of the melamine resin impregnated on the printing paper to be 250g/m when the printing paper is taken out2Then drying at 140 ℃;
and step 3: coating polyurethane resin on one surface of the printing paper subjected to the melamine resin impregnation treatment, and coating the melamine resin prepared in the step 1 on the other surface of the printing paper, wherein the polyurethane resin comprises the following components in parts by weight: 70 parts of water-based resin (35% of water-based acrylic emulsion and 65% of water-based polyurethane emulsion), 0.5 part of defoaming agent, 30 parts of water, 3 parts of alkali-swelling rheological additive, 1 part of antiseptic bactericide and 0.3 part of release agent, wherein the dry weight of the polyurethane resin is 17g/m2The dry weight of the melamine resin is 45g/m2；
And 4, step 4: a second step of drying, namely drying the printing paper coated with the polyurethane resin and the melamine resin in the step 3 at 130 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine dipped paper containing the polyurethane coating obtained by the second step of drying in the step 4 into the required specification and detecting according to the preset standard.
Preparing a melamine board:
and carrying out hot pressing on the melamine impregnated paper containing the polyurethane coating and a base material to obtain the melamine board, wherein the hot pressing temperature is 185 ℃, the hot pressing pressure is 18MPa, and the hot pressing time is 17 s.
Example 3
Preparing melamine impregnated paper containing a polyurethane coating:
step 1: dipping glue, namely firstly mixing 120 parts of melamine, 190 parts of formaldehyde solution, 10 parts of caprolactam, 1 part of triethanolamine, 9 parts of diethylene glycol, 80 parts of water, 0.8 part of curing agent (morpholine 2/15, p-toluenesulfonic acid 4/15 and water 0.4), 0.8 part of release agent and 1.2 parts of dedusting agent according to parts by weight to prepare melamine resin, and then dipping printing paper in the melamine resin;
step 2: drying in the first step, taking out the printing paper which is subjected to the melamine resin impregnation treatment in the step 1, and controlling the wet weight of the melamine resin impregnated on the printing paper to be 270g/m when the printing paper is taken out2Then drying at 120 ℃;
and step 3: coating polyurethane resin on one side of the printing paper subjected to the melamine resin impregnation treatment, wherein the polyurethane resin comprises the following components in parts by weight: 90 parts of water-based acrylic emulsion, 0.6 part of defoaming agent, 20 parts of water, 2.5 parts of alkali swelling rheological additive, 0.7 part of antiseptic bactericide, 0.8 part of fluorocarbon surfactant and 0.2 part of release agent, wherein the dry weight of the polyurethane resin is 25g/m2；
And 4, step 4: second step drying, drying the printing paper coated with the polyurethane resin in the step 3 at 120 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine dipped paper containing the polyurethane coating obtained by the second step of drying in the step 4 into the required specification and detecting according to the preset standard.
Preparing a melamine board:
and carrying out hot pressing on the melamine impregnated paper containing the polyurethane coating and a base material to obtain the melamine board, wherein the hot pressing temperature is 145 ℃, the hot pressing pressure is 18MPa, and the hot pressing time is 15 s.
Comparative example 1
Preparing melamine impregnated paper:
step 1: dipping glue, namely firstly mixing 100 parts of melamine, 180 parts of formaldehyde solution, 6 parts of caprolactam, 2 parts of triethanolamine, 6 parts of diethylene glycol, 83 parts of water, 0.8 part of curing agent (morpholine 2/15, p-toluenesulfonic acid 4/15 and water 0.4), 0.8 part of release agent and 1.1 part of dedusting agent by weight to prepare melamine resin, and then dipping printing paper in the melamine resin;
step 2: drying in the first step, namely, printing paper subjected to melamine resin impregnation treatment in the step 1Taking out the paper, and controlling the dry weight of the melamine resin impregnated on the printing paper to be 140g/m2Then drying at 135 ℃;
and step 3: coating the melamine resin prepared in the step 1 on one side of the printing paper subjected to the melamine resin impregnation treatment, wherein the dry weight of the melamine resin is 75g/m2；
And 4, step 4: second step drying, drying the printing paper coated with the melamine resin in the step 3 at 115 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine impregnated paper obtained by the second step of drying in the step 4 into required specifications and detecting according to preset standards.
Preparing a melamine board:
and carrying out hot pressing on the melamine impregnated paper and a base material to obtain the melamine board, wherein the hot pressing temperature is 190 ℃, the hot pressing pressure is 17MPa, and the hot pressing time is 25 s.
Comparative example 2
Preparing melamine impregnated paper:
step 1: the method comprises the following steps of gumming, namely firstly mixing 100 parts of melamine, 180 parts of formaldehyde solution, 10 parts of caprolactam, 1 part of triethanolamine, 1 part of diethylene glycol, 80 parts of water, 0.7 part of isocyanate curing agent, 0.7 part of release agent and 1.1 part of dedusting agent according to parts by weight to prepare melamine resin, and then dipping printing paper in the melamine resin;
step 2: the first step of drying, namely taking out the printing paper which is subjected to the melamine resin impregnation treatment in the step 1, and controlling the dry weight of the melamine resin impregnated on the printing paper to be 145g/m when the printing paper is taken out2Then drying at 130 ℃;
and step 3: coating melamine resin on both sides of the melamine resin impregnated printing paper, wherein the dry weight of the melamine resin is 40g/m2；
And 4, step 4: secondly, drying, namely drying the printing paper coated with the melamine resin in the step 3 at 110 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine impregnated paper obtained by the second step of drying in the step 4 into required specifications and detecting according to preset standards.
Preparing a melamine board:
and carrying out hot pressing on the melamine impregnated paper containing the polyurethane coating and a base material to obtain the melamine board, wherein the hot pressing temperature is 175 ℃, the hot pressing pressure is 20MPa, and the hot pressing time is 23 s.
The following table shows performance test parameter diagrams of examples 1-3 and comparative examples 1-2, wherein the adhesion test is performed by using GB 1720-79(89) standard test and baige method, respectively, and the melamine board is tested for wear resistance and surface corrosion resistance, wherein the wear resistance test uses a rotor of 100r/min to polish the surfaces of examples 1-3 and comparative examples 1-2, the specific time is set to 10min, and the surface corrosion resistance test method uses a rhodamine test, and the presence or absence of significant shrinkage cavity phenomenon on the surfaces of each example and comparative example is observed, and formaldehyde emission is measured:
as can be seen from table 1, compared with the comparative example, the melamine impregnated paper with the polyurethane coating according to the present invention has better adhesion and higher surface corrosion resistance effect under the condition of less hot pressing time, and has less formaldehyde emission, while maintaining excellent mechanical properties. By adopting the raw material formula and the preparation method, the prepared melamine impregnated paper containing the polyurethane coating has excellent adhesion effect with the base material, the service life is longer, the subsequent grinding process is not needed, and the operation steps are saved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The melamine-dipped paper containing the polyurethane coating is characterized by comprising printing paper subjected to melamine resin dipping treatment, wherein the polyurethane coating is arranged on one surface of the printing paper subjected to the melamine dipping treatment; the polyurethane coating is prepared from the following raw materials in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide and 0.2-0.4 part of release agent.
2. The melamine-dipped paper with a polyurethane coating as claimed in claim 1, wherein the other side of said melamine resin dipped printing paper is further coated with a melamine resin layer.
3. The melamine impregnated paper with the polyurethane coating according to claim 1, wherein the raw materials for preparing the polyurethane coating further comprise 0.5-1 part by weight of fluorocarbon surfactant.
4. The melamine-dipped paper having a polyurethane coating according to claim 1, wherein said aqueous resin is at least one of an aqueous acrylic emulsion and an aqueous polyurethane emulsion.
5. The melamine impregnated paper with a polyurethane coating according to claim 1, wherein the alkali-swelling rheology aid is an anionic acrylic polymer.
6. The melamine-impregnated paper with a polyurethane coating according to claim 1, wherein the melamine resin comprises the following components in parts by weight: 100-200 parts of melamine, 180-220 parts of formaldehyde solution, 5-10 parts of caprolactam, 1-3 parts of triethanolamine, 5-10 parts of diethylene glycol and 80-100 parts of water;
the melamine resin also comprises a curing agent, a release agent and a dedusting agent, and the curing agent is 0.2 part, the release agent is 0.2 part and the dedusting agent is 0.3 part based on 100 parts by weight of the melamine resin.
7. The melamine impregnated paper with the polyurethane coating according to claim 6, wherein the curing agent is compounded from morpholine, p-toluenesulfonic acid and water, and the weight ratio of the morpholine to the p-toluenesulfonic acid to the water is 1:2: 3.
8. The method for preparing the melamine impregnated paper containing the polyurethane coating is characterized in that printing paper is impregnated by pre-prepared melamine resin, then the printing paper is dried for the first step to obtain the printing paper treated by the melamine resin impregnation, and then polyurethane resin is coated on one surface of the printing paper treated by the melamine impregnation, wherein the polyurethane resin comprises the following components in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide, 0.5-1 part of fluorocarbon surfactant and 0.2-0.4 part of release agent, and drying the mixture in the second step to obtain the melamine impregnated paper containing the polyurethane coating.
9. The method for preparing the melamine-impregnated paper with the polyurethane coating according to claim 8, comprising the following steps:
step 1: the printing method comprises the following steps of gumming, namely mixing 100-200 parts by weight of melamine, 180-220 parts by weight of formaldehyde solution, 5-10 parts by weight of caprolactam, 1-3 parts by weight of triethanolamine, 5-10 parts by weight of diethylene glycol and 80-100 parts by weight of water to prepare melamine resin, and then dipping printing paper in the melamine resin;
step 2: step one, drying, namely taking out the printing paper subjected to the melamine resin impregnation treatment in the step 1, and controlling the dry weight of the melamine resin impregnated on the printing paper to be 100-200g/m when the printing paper is taken out2Then drying at 110-150 ℃;
and step 3: coating polyurethane resin on one surface of the printing paper subjected to the melamine resin impregnation treatment, and coating the melamine resin prepared in the step 1 on the other surface of the printing paper, wherein the polyurethane resin comprises the following components in parts by weight: 70-90 parts of water-based resin, 0.5-1 part of defoaming agent, 20-30 parts of water, 2-3 parts of alkali swelling rheological additive, 0.5-1 part of anticorrosive bactericide, 0.5-1 part of fluorocarbon surfactant and 0.2-0.4 part of release agent, wherein the dry weight of the polyurethane resin is 10-30 g/m2The dry weight of the melamine resin is 40-90g/m2；
And 4, step 4: secondly, drying, namely drying the printing paper coated with the polyurethane resin and the melamine resin in the step 3 at 100-140 ℃;
and 5: and (4) cutting and detecting, namely cutting the melamine dipped paper containing the polyurethane coating obtained by the second step of drying in the step 4 into the required specification and detecting according to the preset standard.
10. Use of the melamine-dipped paper with a polyurethane coating as claimed in any one of claims 1 to 7 for the preparation of a melamine board, wherein the melamine-dipped paper with a polyurethane coating is hot-pressed with a substrate to obtain a melamine board, wherein the hot-pressing temperature is 140 ℃ and 185 ℃, the hot-pressing pressure is 16-20MPa, and the hot-pressing time is 15-20 s.
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