CN111531660B - Low-formaldehyde impregnated bond paper facing artificial board and preparation method thereof - Google Patents
Low-formaldehyde impregnated bond paper facing artificial board and preparation method thereof Download PDFInfo
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- CN111531660B CN111531660B CN202010394890.4A CN202010394890A CN111531660B CN 111531660 B CN111531660 B CN 111531660B CN 202010394890 A CN202010394890 A CN 202010394890A CN 111531660 B CN111531660 B CN 111531660B
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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
- D21H17/54—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
-
- 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
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
-
- 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
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
Abstract
The invention claims to protect a low-formaldehyde impregnated bond paper decorative artificial board and a preparation method thereof, wherein paper is completely impregnated in an aldehyde-free impregnated adhesive for 20-40s and then dried at 75-105 ℃ until no redundant bond liquid exists on the paper surface; after drying, the paper is completely immersed in melamine-formaldehyde adhesive or urea-formaldehyde adhesive for 5-10s and then completely dried at 90-110 ℃. Selecting an aldehyde-free artificial board, and hot-pressing the impregnated bond paper on the artificial board for 0.5-2min at the pressure of 4-6Mpa and the temperature of 140-. The formaldehyde-free impregnating adhesive comprises: 30-50 parts of waterborne polyurethane emulsion, 1-5 parts of nano-cellulose, 5-10 parts of filler and 300 parts of water 200-one. The artificial board prepared by the application is suitable for products with higher physical strength requirements; meanwhile, the dipping time of the aldehyde-containing adhesive is correspondingly shortened, so that the absorption of paper to aldehyde substances is reduced, the subsequent processing process and the release of free formaldehyde of a final product are reduced, and the release of the free formaldehyde is reduced to a great extent.
Description
Technical Field
The invention relates to a low-formaldehyde impregnated decorative paper facing artificial board and a preparation method thereof, belonging to the technical field of artificial board processing.
Background
The impregnated paper-faced artificial board is the most widely and important one of the facing artificial board products, and is a decorative board which mostly uses artificial boards such as shaving boards, fiber boards and the like as base materials and impregnated paper as facing materials. Because the wood-based panel has the advantages of more material saving, good processing performance and diversified surface decoration, and can endow the wood-based panel with more excellent performance, the wood-based panel has very wide application in the wood industry, particularly in interior decoration. In the production of the traditional impregnated bond paper veneer artificial board, adhesives used for bonding the raw materials of the board and pressing the veneer paper on the board release a large amount of free formaldehyde.
With the increasing requirements of people on indoor environment and the coming of relevant national laws and regulations, the release of free formaldehyde in the production and use of facing artificial board products is urgently reduced. Researchers respectively research the aldehyde reduction problems of two main materials of the impregnated bond paper facing artificial board, namely the artificial board and the impregnated bond paper.
For reducing aldehyde of the artificial board, the currently adopted technical means mainly adopts bio-based adhesives (such as soy protein) and resin adhesives (mainly polyurethane) to replace the traditional melamine adhesives and urea-formaldehyde adhesives. For example, soybean meal glues developed at the university of Guangxi were used in the manufacture of particle board (CN109880586A), and polyurethane adhesives were used in the production of particle board by Wanhua chemistry (CN 109081902A). Three major types of artificial boards (shaving boards, fiber boards and plywood) are all industrially realized without hydroformylation.
However, the paper and the raw material of the artificial board have great differences in macroscopic size, fiber state and material interface characteristics, and the fact proves that the adhesive suitable for the production of the artificial board is not suitable for the impregnated bond paper for the facing of the artificial board. Therefore, the aldehyde reduction of the impregnated bond paper requires the development of adhesives with specific properties. Currently, bio-based adhesives are rarely used in decorative paper impregnation due to their resistance to mildew and poor weatherability. Only a few reports on (modified) polymer resin adhesives have been reported, for example, the yoyuan impregnated paper industry ltd (CN 109776717 a) in linyi city has obtained an acrylate-based decorative paper impregnating adhesive, so that the produced prepreg decorative paper and overlay paper have no aldehyde, and the decorative paper is soft, rollable and cuttable. Polyurethane impregnating adhesives developed by Wanhua ecological technology limited company (CN 110450239A) can also realize no hydroformylation of decorative paper. However, the organic polymer resin adhesive has a large viscosity, a large particle size and a high degree of crosslinking, and is difficult to permeate into the interior of the decorative base paper, so that a plurality of problems exist. Most importantly, compared with traditional urea-formaldehyde glue and melamine-formaldehyde glue, the impregnated bond paper produced by the adhesive has poorer physical properties, particularly poor scratch resistance, low hardness, and incapability of meeting relevant national standard requirements on glossiness and plumpness, and has the defect of peeling between decorative paper and paper due to the difficulty in permeating glue solution between paper layers.
Therefore, under the condition of higher requirements on the physical properties of the veneer artificial board product, part of the traditional melamine-formaldehyde impregnating adhesive or urea-formaldehyde impregnating adhesive is reserved, and the dual requirements of reducing formaldehyde and ensuring the physical properties are met. The preparation method is characterized in that the aldehyde-free adhesive for the decorative paper is prepared, wherein the aldehyde-free adhesive is good in paper permeability, high in adhesion, excellent in adhesive film physical strength and high in adhesive amount, and therefore low hydroformylation of products is achieved. Meanwhile, by combining the melamine-formaldehyde impregnating adhesive or the urea formaldehyde impregnating adhesive, a proper paper impregnating, drying and hot-pressing process is selected, so that the loss of the physical properties of the impregnated bond paper veneer artificial board product is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing the waterborne polyurethane aldehyde-free adhesive for the impregnated bond paper with the physical strength meeting the national standard requirement and the preparation method thereof, and providing the impregnation and hot pressing process suitable for the adhesive by combining the melamine-formaldehyde impregnation adhesive or the urea-formaldehyde adhesive to realize the preparation of the artificial board with the low-formaldehyde impregnated bond paper veneer.
The preparation method of the artificial board with the low-formaldehyde impregnated bond paper veneer comprises the following steps: completely soaking paper in the formaldehyde-free soaking adhesive for 20-40s, and drying at 75-105 ℃ until no excessive glue solution exists on the paper surface; after drying, completely soaking the paper in a melamine-formaldehyde adhesive or a urea formaldehyde adhesive for 5-10s, and completely drying at 90-110 ℃. Selecting an aldehyde-free artificial board, and hot-pressing the impregnated bond paper on the artificial board for 0.5-2min at the pressure of 4-6Mpa and the temperature of 140-.
Further, the formaldehyde-free impregnating adhesive comprises the following components in parts by mass:
aqueous polyurethane emulsion: 30-50 parts of
Nano-cellulose: 1-5 parts of
Filling: 5-10 parts of
Water: 200 portions and 300 portions.
Specifically, the nano-cellulose is dialdehyde modified nano-cellulose, the solid content is 0.5-3%, and the particle size is 20-50 nm. As a filler dispersant, the filler can be uniformly and stably present in the aqueous polyurethane emulsion. The structure of the dialdehyde modified nano-cellulose is as follows:
specifically, the filler is a titanium dioxide suspension with the particle size of 50-200nm, and the mass fraction is about 20%; silicon dioxide suspension with the particle size of 50-100nm, the mass fraction is about 10%; 50-100nm zinc dioxide suspension with the mass fraction of about 10%; alumina suspension with the grain diameter of 50-200nm, and the mass fraction of the alumina suspension is about 10 percent or the combination of a plurality of alumina suspensions. The function of the paper is to improve the hanging amount of the impregnated bond paper and the scratch resistance and wear resistance of the adhesive film.
Specifically, the formula of the aqueous polyurethane emulsion comprises the following components: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-2, the molar part of the dihydric alcohol is 20-40, the chain extender is 3-8, the hydrophilic agent is 5-10, the glacial acetic acid is 0.1-1 and the water is 50-80.
More specifically, the dihydric alcohol comprises one or more of polyester dihydric alcohol and polyether dihydric alcohol which do not contain aliphatic rings or aromatic rings. The diisocyanate comprises one or more of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI) and Lysine Diisocyanate (LDI). The chain extender is one of ethylene glycol, propylene glycol, 1, 4-butanediol, diethylene glycol and 1, 4-cyclohexanediol. The hydrophilic agent is N-Methyldiethanolamine (MDEA).
The preparation method of the waterborne polyurethane emulsion comprises the following steps:
1) adding dihydric alcohol and diisocyanate into a reaction kettle with a stirring and refluxing device according to a certain proportion, and carrying out prepolymerization reaction under the protection of high-purity nitrogen at the reaction temperature of 40-60 ℃ for 0.5-1h to obtain the polyurethane prepolymer.
2) Heating the prepolymer to 65-80 ℃, dropwise adding a chain extender into the prepolymer for 10-20min, carrying out chain extension reaction for 0.5-1.5h, and stirring at a speed of 50-100 r/min. Then cooling to 40-60 ℃, adding the hydrophilic agent, and finishing the addition within 30min, wherein the reaction time is 0.5-1.5 h.
3) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity and shearing at high speed, wherein the shearing speed is 2000-; the solid content of the emulsion is about 20 percent, the particle diameter is 50-100nm, the viscosity is 50-100cp, and the molecular weight is 500-2000-.
According to the formula proportion, the nano-cellulose is put into water and polyurethane emulsion at room temperature, and stirred for 5-10min at the speed of 500-; and then adjusting the stirring speed to 1000-3000r/min, simultaneously adding a filler, continuously stirring for 10-20min, and standing to obtain the aldehyde-free adhesive for the impregnated adhesive film paper.
Dipping and drying the base paper by adopting the aldehyde-free adhesive to obtain dipped adhesive film paper; and hot-pressing the impregnated decorative paper to the surface of the artificial board to obtain the decorative paper veneer artificial board. And testing the relevant physical properties of the impregnated decorative paper according to national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
The invention has the following advantages:
1) the prepared polyurethane aldehyde-free adhesive is used for replacing the traditional first-stage aldehyde-containing dipping adhesive, so that the production process and the release of free formaldehyde of a final product are reduced; meanwhile, the formaldehyde-free adhesive has small particle size, small molecular weight and moderate viscosity, so that the impregnating adhesive can well permeate into the paper, and the problem of damage among the paper of the decorative paper after the common resin adhesive is impregnated is solved. Compared with the acrylate formaldehyde-free adhesive with the same coating amount, the polyurethane adhesive has the advantage of better adhesive film performance.
2) In the second stage of impregnation, the traditional aldehyde-containing adhesive impregnation mode is still adopted, so that the product has higher physical properties compared with two-stage aldehyde-free adhesive impregnation, and the product is suitable for products with higher physical strength requirements; meanwhile, the dipping time of the aldehyde-containing adhesive is correspondingly shortened, so that the absorption of paper on aldehyde substances is reduced, the subsequent processing processes (drying and hot pressing) and the release of free formaldehyde of a final product are reduced, and the release of the free formaldehyde is reduced to a great extent.
Detailed Description
Example 1
1) Adding polyethylene glycol (molecular weight 200) and isophorone diisocyanate into a reaction kettle with a stirring and refluxing device according to a molar ratio of 0.8, and carrying out prepolymerization reaction at 40 ℃ for 1h under the protection of high-purity nitrogen to obtain the polyurethane prepolymer.
2) Heating the prepolymer to 65 ℃, dropwise adding 1, 4-butanediol into the prepolymer for 20min, performing chain extension reaction for 1.5h, and stirring at a speed of 50 r/min. Then the temperature is reduced to 40 ℃, the hydrophilic agent is added, the addition is completed within 30min, and the reaction time of the step is 0.5 h.
3) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity, shearing at high speed, wherein the shearing speed is 2000r/min, and evaporating to remove acetone to obtain the aqueous polyurethane emulsion.
4) The aldehyde-free adhesive for the decorative paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 30 portions of
Nano-cellulose: 5 portions of
Titanium dioxide (particle size 100 nm): 10 portions of
Water: 200 parts.
According to the formula proportion, the nano-cellulose is put into water and polyurethane emulsion at room temperature, and stirred for 10min at the speed of 500 r/min; and then adjusting the stirring speed to 1000r/min, simultaneously adding a filler, continuously stirring for 20min, and standing to obtain the aldehyde-free adhesive for the impregnated bond paper.
Completely soaking paper in the formaldehyde-free soaking adhesive for 20s, and then drying at 105 ℃ until no excessive glue solution exists on the paper surface; after drying, the paper is completely immersed in the melamine-formaldehyde adhesive for 10s and then completely dried at 110 ℃. Selecting an aldehyde-free artificial board, and hot-pressing the impregnated bond paper on the artificial board at the pressure of 4Mpa and the temperature of 140 ℃ for 0.5min to obtain the artificial board with the low-aldehyde impregnated bond paper veneer. And testing the relevant physical properties of the impregnated decorative paper according to national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
Example 2
1) Adding polyester diol CMA-1024 and isophorone diisocyanate into a reaction kettle with a stirring and refluxing device according to the molar ratio of 2, and carrying out prepolymerization reaction at the reaction temperature of 60 ℃ for 0.5h under the protection of high-purity nitrogen to obtain a polyurethane prepolymer.
2) Heating the prepolymer to 80 ℃, dropwise adding ethylene glycol into the prepolymer for 10min, performing chain extension reaction for 0.5h, and stirring at 100 r/min. Then the temperature is reduced to 60 ℃, the hydrophilic agent is added, the addition is finished within 30min, and the reaction time of the step is 1.5 h.
3) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity, shearing at high speed with the shearing speed of 4000r/min, and evaporating to remove acetone to obtain the aqueous polyurethane emulsion.
4) The aldehyde-free adhesive for the decorative paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 50 portions of
Nano-cellulose: 1 part of
Alumina (particle size 100 nm): 5 portions of
Water: 300 parts.
According to the formula proportion, the nano-cellulose is put into water and polyurethane emulsion at room temperature, and stirred for 5min at the speed of 800 r/min; and then regulating the stirring speed to 3000r/min, simultaneously adding a filler, continuously stirring for 10min, and standing to obtain the aldehyde-free adhesive for the impregnated bond paper.
Completely soaking paper in the formaldehyde-free soaking adhesive for 40s, and then drying at 75 ℃ until no excessive glue solution exists on the paper surface; after drying, the paper is completely immersed in the urea formaldehyde adhesive for 5s and then completely dried at 90 ℃. Selecting an aldehyde-free artificial board, and carrying out hot pressing on the impregnated bond paper on the artificial board for 2min at the pressure of 6Mpa and the temperature of 220 ℃ to obtain the artificial board with the low-aldehyde impregnated bond paper decorative surface. And testing the relevant physical properties of the impregnated decorative paper according to national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
Example 3
1) Adding polyester diol CMA-1024, polyethylene glycol (the molar ratio of the two is 1: 1) and hexamethylene diisocyanate into a reaction kettle with a stirring and refluxing device according to the molar ratio of 1.3, and carrying out prepolymerization reaction at the reaction temperature of 50 ℃ for 0.7h under the protection of high-purity nitrogen to obtain the polyurethane prepolymer.
2) Heating the prepolymer to 75 ℃, dropwise adding propylene glycol into the prepolymer for 15min, performing chain extension reaction for 0.8h, and stirring at 80 r/min. Then cooling to 50 ℃, adding the hydrophilic agent, and finishing the addition within 30min, wherein the reaction time is 1 h.
3) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity, carrying out high-speed shearing at the shearing speed of 3000r/min, and evaporating and removing the acetone to obtain the aqueous polyurethane emulsion.
4) The aldehyde-free adhesive for the decorative paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 40 portions of
Nano-cellulose: 3 portions of
4 portions of silicon dioxide (with the grain diameter of 100nm) and 3 portions of zinc dioxide (with the grain diameter of 50nm)
Water: 250 parts of the raw materials.
According to the formula proportion, the nano-cellulose is put into water and polyurethane emulsion at room temperature, and stirred for 7min at 650 r/min; and then adjusting the stirring speed to 2000r/min, simultaneously adding a filler, continuously stirring for 15min, and standing to obtain the aldehyde-free adhesive for the impregnated bond paper.
Completely soaking paper in the formaldehyde-free soaking adhesive for 30s, and then drying at 90 ℃ until no excessive glue solution exists on the paper surface; after drying, the paper is completely immersed in the melamine-formaldehyde adhesive for 7s and then completely dried at 100 ℃. Selecting an aldehyde-free artificial board, and hot-pressing the impregnated bond paper on the artificial board for 1min at the pressure of 5Mpa and the temperature of 170 ℃ to obtain the artificial board with the low-aldehyde impregnated bond paper decorative surface. And testing the relevant physical properties of the impregnated decorative paper according to national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
Comparative example 1
The difference from the technical solution of example 1 is that no nanocellulose and no filler are added.
TABLE 1 comparison of physical Properties of impregnated bond paper and veneer
a.CN 110450239 A b.CN 109776717 A
The test is according to national standard: GB/T28995-2012, GB/T17657-2013, GB/T15102-2017
The impregnated bond paper prepared by the adhesive has no release of free formaldehyde, and compared with the published polyurethane formaldehyde-free adhesive and acrylate adhesive, the adhesive has better permeability, surface bonding performance and scratch resistance, and meets the requirements of related national standards. The filler in the adhesive formula increases the adhesive hanging amount of the impregnated bond paper, and improves the scratch resistance of the product to a certain extent.
Claims (7)
1. A preparation method of a low-formaldehyde impregnated bond paper facing artificial board is characterized by comprising the following steps: completely soaking paper in the formaldehyde-free soaking adhesive for 20-40s, and drying at 75-105 ℃ until no excessive glue solution exists on the paper surface; after drying, completely soaking the paper in a melamine-formaldehyde adhesive or a urea formaldehyde adhesive for 5-10s, completely drying at 90-110 ℃, selecting an aldehyde-free artificial board, and carrying out hot pressing on the impregnated bond paper on the artificial board for 0.5-2min at the pressure of 4-6Mpa and the temperature of 140-;
the preparation method of the formaldehyde-free impregnating adhesive comprises the following steps: 1) adding dihydric alcohol and diisocyanate into a reaction kettle with a stirring and refluxing device according to a ratio, and carrying out prepolymerization reaction under the protection of high-purity nitrogen at the reaction temperature of 40-60 ℃ for 0.5-1h to obtain a polyurethane prepolymer; 2) heating the prepolymer to 65-80 ℃, dropwise adding a chain extender into the prepolymer for 10-20min, carrying out chain extension reaction for 0.5-1.5h at a stirring speed of 50-100r/min, then cooling to 40-60 ℃, adding a hydrophilic agent, and finishing the addition within 30min, wherein the reaction time is 0.5-1.5 h; 3) cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity and shearing at high speed, wherein the shearing speed is 2000-; the solid content of the emulsion is 20 percent, the particle diameter is 50-100nm, the viscosity is 50-100cp, and the molecular weight is 500-; 4) according to the formula proportion, the nano-cellulose is put into water and the aqueous polyurethane emulsion at room temperature, and stirred for 5-10min at the speed of 500-; then adjusting the stirring speed to 1000-;
the formula of the waterborne polyurethane emulsion comprises: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-2, the molar part of the dihydric alcohol is 20-40, the chain extender is 3-8, the hydrophilic agent is 5-10, the glacial acetic acid is 0.1-1, and the water is 50-80;
the dihydric alcohol comprises one or more of polyester dihydric alcohol and polyether dihydric alcohol which do not contain aliphatic rings and aromatic rings;
the nano-cellulose is dialdehyde modified nano-cellulose, the solid content is 0.5-3%, and the particle size is 20-50 nm.
2. The preparation method of claim 1, wherein the aldehyde-free impregnating adhesive comprises the following components in parts by mass: aqueous polyurethane emulsion: 30-50 parts of nano cellulose: 1-5 parts of filler: 5-10 parts of water: 200 portions and 300 portions.
3. The method of claim 1, wherein the diisocyanate comprises one or more of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), and Lysine Diisocyanate (LDI).
4. The preparation method according to claim 1, wherein the chain extender is one of ethylene glycol, propylene glycol, 1, 4-butanediol, diethylene glycol and 1, 4-cyclohexanediol.
5. The method of claim 1, wherein the hydrophilic agent is N-Methyldiethanolamine (MDEA).
6. The preparation method according to claim 1, characterized in that the filler is a titanium dioxide suspension with a particle size of 50-200nm, and the mass fraction is 20%; 10 percent of silicon dioxide suspension with the particle size of 50-100nm by mass; 50-100nm zinc dioxide suspension, the mass fraction is 10%; alumina suspension with the particle size of 50-200nm, wherein the mass fraction of the alumina suspension is 10 percent of one or a combination of more of the alumina suspension.
7. A low-aldehyde impregnated bond paper-faced artificial board manufactured according to the manufacturing method of any one of claims 1 to 6.
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| CN114481683A (en) * | 2020-10-27 | 2022-05-13 | 福建省德锐新材有限公司 | Soaking secondary drying curing preparation process for secondary hot-pressing curing refractory plate |
| CN113733262A (en) * | 2021-08-30 | 2021-12-03 | 雪宝家居集团有限公司 | Surface dipping wear-resistant treatment process for environment-friendly plate |
| CN113699829A (en) * | 2021-08-31 | 2021-11-26 | 广东肇庆福美装饰材料有限公司 | High-performance low-cycle impregnating adhesive and preparation method and use method thereof |
| CN114351503B (en) * | 2022-01-10 | 2023-06-23 | 山东坤瀚新材料科技有限公司 | Emulsion for waterproof abrasive paper and use method thereof |
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