CN113146786A - Preparation method of anti-corrosion finger-jointed board wood - Google Patents
Preparation method of anti-corrosion finger-jointed board wood Download PDFInfo
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- CN113146786A CN113146786A CN202110322417.XA CN202110322417A CN113146786A CN 113146786 A CN113146786 A CN 113146786A CN 202110322417 A CN202110322417 A CN 202110322417A CN 113146786 A CN113146786 A CN 113146786A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
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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
- B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09J161/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C09J161/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a preparation method of an anticorrosive finger-jointed board wood, which comprises the following steps: s1: drying eucalyptus grandis log, peeling, sawing into saw timber, and drying; s2: the spare sawn timber is fixed in width and length, cut into finger joint pieces, tenoned by a tenoning machine, and longitudinally jointed into long strips by a butt joint machine; s3: gluing the side surface of the finger joint strip, splicing the finger joint strip into a plate by using a plate splicing machine, and drying the plate after splicing the plate; s4: sanding and edge cutting are carried out by using a sander and a fine cutting saw; packaging and warehousing after the inspection is qualified; the adhesive used for gluing is prepared from the following raw materials: formaldehyde, urea, melamine, lignin, polyvinyl alcohol, ammonium chloride, tributyl citrate, an initiator, sucrose ester, konjac flour, aluminum hydroxide ultrafine powder, sodium carboxymethylcellulose and polyaniline. The invention has simple process and low cost, and the prepared finger joint board has higher mechanical property, corrosion resistance and flame retardant property.
Description
Technical Field
The invention belongs to the technical field of wood preparation, and particularly relates to a preparation method of an anticorrosive finger-jointed board wood.
Background
The finger joint board is formed by splicing a plurality of boards, the upper part and the lower part of the finger joint board are not stuck with clamping plates, and the vertical boards are connected by zigzag interfaces, so that the finger joint board is similar to the cross joint of two fingers. The finger-jointed boards are used as the same as the blockboards, but the glue consumption of the finger-jointed boards in the production process is much less than that of the blockboards, so that the finger-jointed boards are more environment-friendly than the blockboards, and more people begin to select the finger-jointed boards to replace the blockboards. The finger joint plate does not need to be pasted with a splint up and down, and the glue consumption is greatly reduced.
Most of finger-jointed boards adopt urea-formaldehyde resin or modified urea-formaldehyde glue in the production process, and the glue has the characteristics of high bonding strength and difficulty in glue opening, but can release formaldehyde under certain conditions. Formaldehyde is determined by the world health organization to be a carcinogenic and teratogenic substance, and the influence on human health is mainly reflected in aspects of abnormal smell, stimulation, sensitization, abnormal lung function, abnormal liver function, abnormal immune function and the like. There are two main sources of formaldehyde emissions: firstly, the board itself produces formaldehyde due to internal decomposition when dried. The method is characterized in that in the stacking and using processes of the plates, the incompletely cured resin in the plates can be degraded to release formaldehyde under the environmental conditions of temperature, humidity, acid and alkali, illumination and the like. Wherein the smaller the wood density, the stronger the formaldehyde emission capability. Secondly, formaldehyde is generated by the adhesive used for bonding the plate base materials. The method is characterized in that in the aspects of glue making and hot pressing, urea does not completely react with formaldehyde during glue making, so that the glue contains a part of free formaldehyde, and the concentration of the free formaldehyde is related to the adopted molar ratio and the plate making process; the adhesive is not cured completely in the plate hot pressing process, and a part of unstable structures (such as ether bonds, hydroxymethyl groups and methylene) in the adhesive are decomposed to release formaldehyde. The formaldehyde release in the finger-jointed board can change along with the change of the hot pressing temperature and the glue application amount, and the indoor environment quality can be influenced for a long time.
Meanwhile, the structure and physical properties of the finger-jointed board are not very stable, the hardness is poor, the toughness and the strength are low, and the like. The quality of the laminated wood board is superior to that of other finger-jointed boards, but the veneers need to be attached by hot pressing, so that the material loss is large and the cost is high.
Disclosure of Invention
The invention aims to provide an adhesive for anticorrosive finger-jointed board wood and a preparation method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of anti-corrosion finger-jointed board wood comprises the following steps:
s1: airing, peeling and sawing fresh eucalyptus grandis logs into standby sawn timber, and then drying until the water content is 10-12%;
s2: fixing the width and length of the spare sawn timber, cutting the spare sawn timber into finger joint pieces with required sizes, tenoning the finger joint pieces by using a tenoning machine, and performing tenon joint longitudinally on the tenoned finger joint pieces by using a butt joint machine to form long strips;
s3: gluing the side surfaces of the finger-jointed strips, splicing the finger-jointed strips into boards in parallel by using a board splicing machine, and drying the boards until the water content is 8-12% after the boards are spliced;
s4: sanding and edge cutting are carried out on the finger-jointed board by using a sander and a finishing saw; packaging and warehousing the qualified products;
the adhesive used for gluing is prepared from the following raw materials in parts by weight: 300-600 parts of formaldehyde, 150-250 parts of urea, 50-150 parts of melamine, 30-50 parts of lignin, 3-5 parts of polyvinyl alcohol, 1-5 parts of ammonium chloride, 0.2-0.9 part of tributyl citrate, 0.2-0.8 part of an initiator, 5-15 parts of sucrose ester, 1-5 parts of konjac glucomannan, 1-5 parts of aluminum hydroxide ultrafine powder, 10-16 parts of sodium carboxymethylcellulose and 4-7 parts of polyaniline.
Further, the adhesive is prepared from the following raw materials in parts by weight: 400-500 parts of formaldehyde, 180-220 parts of urea, 80-120 parts of melamine, 35-45 parts of lignin, 3.5-4.5 parts of polyvinyl alcohol, 2-4 parts of ammonium chloride, 0.4-0.7 part of tributyl citrate, 0.3-0.7 part of an initiator, 7-12 parts of sucrose ester, 2-4 parts of konjac glucomannan, 2-4 parts of aluminum hydroxide ultrafine powder, 12-14 parts of sodium carboxymethylcellulose and 5-6 parts of polyaniline.
Further, the initiator is persulfate.
Further, the preparation method of the adhesive comprises the following steps:
s1: pre-mixing aluminum hydroxide ultrafine powder, polyaniline and sodium carboxymethylcellulose to obtain a mixed material;
s2: dividing urea into four parts, adding formaldehyde into a reaction kettle, starting up the reaction kettle, stirring, adding ammonium chloride, uniformly mixing, and adding concentrated sulfuric acid to adjust the pH value of a reaction solution to 1.8-2.2; adding melamine, polyvinyl alcohol, an initiator and a first part of urea into a reaction kettle, heating the reaction solution to 30-50 ℃, and stirring for 10-30 min under heat preservation;
s3: heating the reaction liquid to 88-95 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 4.5-5.5, then adding lignin and a second part of urea, and stirring for 10-30 min under heat preservation;
s4: cooling the reaction liquid to 80-86 ℃, and adding sodium hydroxide to adjust the pH value of the reaction liquid to 6.5-7.5; then adding sodium carboxymethylcellulose, tributyl citrate, a third part of urea and a mixed material, and stirring for 5-10 min under heat preservation;
s5: cooling the reaction liquid to 50-70 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 8.5-9.2, then adding sucrose ester, konjac glucomannan and fourth part of urea, and stirring for 10-30 min under heat preservation; and (5) cooling the reaction liquid to room temperature, adding the mixed material obtained in the step (S1), and uniformly stirring to obtain the catalyst.
Further, in the step S1, the mass ratio of the four parts of urea is 10: 3-7: 2-5: 1-2.
Further, in step S2, the method for premixing the aluminum hydroxide ultrafine powder, the polyaniline, and the sodium carboxymethyl cellulose comprises: dispersing sodium carboxymethylcellulose in water to obtain a dispersion solution, adding aluminum hydroxide ultrafine powder and polyaniline, and stirring for 5-10 min.
Further, the mass percentage of the sodium carboxymethylcellulose in the dispersion liquid is 0.8-1.2%.
The invention has the following beneficial effects:
1. the preparation method of the anti-corrosion finger-jointed board wood has the advantages of simple process and low cost, and the prepared finger-jointed board has better mechanical property, anti-corrosion property and flame retardant property.
2. The corrosion resistance and the mechanical property of the plate are closely related to the adhesive, and the adhesive disclosed by the invention takes formaldehyde, polyvinyl alcohol and urea as main raw materials for synthesizing the adhesive to prepare urea-formaldehyde resin serving as a main component of the adhesive; the urea and the melamine have the function of a formaldehyde trapping agent, and can reduce the release of formaldehyde; the ammonium chloride has weak acidity, can adjust the pH value of a reaction solution, has the advantages of good water solubility, low price, no toxicity and no odor, has a certain curing effect, can shorten the curing time of the adhesive, and can react with free formaldehyde to further reduce the release of the formaldehyde; the lignin has cohesiveness, dispersibility and chelation, can react with formaldehyde to generate lignin-formaldehyde resin, further reduces the emission of formaldehyde, ensures that the adhesive has large cohesiveness and good disintegration, can improve the compressive strength and compactness of the finger-joint board, has early strength effect, shortens the setting time, can also increase the surface affinity between the glue and the board, has better initial viscosity, reasonably utilizes waste lignin in the pulping and papermaking industry, and reduces the environmental pollution; the tributyl citrate has small volatility, no toxicity and mildew resistance, can enhance the corrosion resistance and oil resistance of the plate, and has good adhesive force; the molecular structure of the sucrose ester contains strong hydrophilic sucrose groups and lipophilic fatty acid groups, so that the sucrose ester has strong surface activity and good dispersing and emulsifying effects, can improve the dispersibility of each component in a system, ensures the uniformity of the pouring sealant in the solidification process, and further improves the solidification effect and the anti-aging effect; the tributyl citrate has good plasticizing effect and good lubricating property, and can synergistically improve the dispersing effect of the sucrose ester, so that the use amount of the sucrose ester is reduced; the konjac flour contains konjac starch, has certain cohesiveness, also contains konjac glucomannan, has the characteristics of low protein, low fat, high fiber, strong water absorption, high expansion rate and the like, and can increase the tensile strength and toughness of the adhesive; and the starch can form a complex with sucrose ester, prevent starch from aging and retrogradation, play a role in corrosion prevention, enhance the processing performance of the adhesive and enhance the mechanical performance of wood.
3. In the preparation raw materials of the adhesive, the aluminum hydroxide ultrafine powder has a flame retardant function, and the addition of the aluminum hydroxide ultrafine powder enables the adhesive to have flame retardant property, so that the flammability risk of the plate is reduced. The aluminum hydroxide is weakly acidic, and the aluminum hydroxide ultrafine powder and the polyaniline are mixed in the solvent to form a structure of the polyaniline-coated aluminum hydroxide ultrafine powder, so that the aluminum hydroxide is prevented from being neutralized and the flame retardant effect is prevented from being influenced; polyaniline is a conductive polymer, and can play a role in physical corrosion prevention and chemical corrosion prevention; the sodium carboxymethyl cellulose has stabilizing and thickening effects, can improve the adhesion and adhesive force, and can ensure that the solid components are uniformly distributed in the solvent.
4. The adhesive prepared by the invention has higher adhesive property, short curing time and low reaction temperature, and compared with the traditional adhesive product, the adhesive has the advantages of simple formula, reduction of the existence of free formaldehyde, great reduction of pollution caused by glue, environmental protection and good adhesive effect, can reduce the using amount of the adhesive, and saves the cost.
Detailed Description
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
The present invention is illustrated by the following more specific examples.
Example 1
A preparation method of anti-corrosion finger-jointed board wood comprises the following steps:
s1: drying fresh eucalyptus grandis logs in the air, peeling, sawing into spare sawn timber, and drying until the water content is 10%;
s2: fixing the width and length of the spare sawn timber, cutting the spare sawn timber into finger joint pieces with required sizes, tenoning the finger joint pieces by using a tenoning machine, and performing tenon joint longitudinally on the tenoned finger joint pieces by using a butt joint machine to form long strips;
s3: gluing the side surface of the finger-jointed strip, splicing the finger-jointed strip into a plate in parallel by using a plate splicing machine, and drying the plate after the plate splicing is finished until the water content is 8%;
s4: sanding and edge cutting are carried out on the finger-jointed board by using a sander and a finishing saw; packaging and warehousing the qualified products;
the adhesive used for gluing is prepared from the following raw materials in parts by weight: 300 parts of formaldehyde, 150 parts of urea, 80 parts of melamine, 35 parts of lignin, 3 parts of polyvinyl alcohol, 5 parts of ammonium chloride, 0.2 part of tributyl citrate, 0.8 part of sodium persulfate, 5 parts of sucrose ester, 1 part of konjac flour, 1 part of aluminum hydroxide ultrafine powder, 10 parts of sodium carboxymethylcellulose and 5 parts of polyaniline.
The preparation method of the adhesive comprises the following steps:
s1: the preparation method comprises the following steps of premixing aluminum hydroxide ultrafine powder, polyaniline and sodium carboxymethylcellulose, wherein the premixing method comprises the following steps: dispersing sodium carboxymethylcellulose in water to obtain 0.9% dispersion, adding aluminium hydroxide ultrafine powder and polyaniline, and stirring for 5min to obtain a mixed material;
s2: dividing urea into four parts according to the mass ratio of 10:3:2:1, adding formaldehyde into a reaction kettle, starting up to stir, adding ammonium chloride, uniformly mixing, adding concentrated sulfuric acid, and adjusting the pH value of a reaction solution to 1.8; then adding melamine, polyvinyl alcohol, sodium persulfate and the first part of urea into a reaction kettle, heating the reaction solution to 30 ℃, and stirring for 10min under the condition of heat preservation;
s3: heating the reaction liquid to 88 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 4.5, then adding lignin and a second part of urea, and stirring for 10min under heat preservation;
s4: cooling the reaction liquid to 80 ℃, and adding sodium hydroxide to adjust the pH value of the reaction liquid to 7.5; then adding sodium carboxymethylcellulose, tributyl citrate, a third part of urea and the mixed material, and stirring for 5min under heat preservation;
s5: cooling the reaction liquid to 50 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 8.5, then adding sucrose ester, konjac flour and the fourth part of urea, and stirring for 10min under heat preservation; and (5) cooling the reaction liquid to room temperature, adding the mixed material obtained in the step (S1), and uniformly stirring to obtain the catalyst.
Example 2
A preparation method of anti-corrosion finger-jointed board wood comprises the following steps:
s1: drying fresh eucalyptus grandis logs in the air, peeling, sawing into spare sawn timber, and drying until the water content is 11%;
s2: fixing the width and length of the spare sawn timber, cutting the spare sawn timber into finger joint pieces with required sizes, tenoning the finger joint pieces by using a tenoning machine, and performing tenon joint longitudinally on the tenoned finger joint pieces by using a butt joint machine to form long strips;
s3: gluing the side surface of the finger-jointed strip, splicing the finger-jointed strip into a plate in parallel by using a plate splicing machine, and drying the plate after the plate splicing is finished until the water content is 10%;
s4: sanding and edge cutting are carried out on the finger-jointed board by using a sander and a finishing saw; packaging and warehousing the qualified products;
the adhesive used for gluing is prepared from the following raw materials in parts by weight: 400 parts of formaldehyde, 250 parts of urea, 50 parts of melamine, 30 parts of lignin, 3.5 parts of polyvinyl alcohol, 2 parts of ammonium chloride, 0.9 part of tributyl citrate, 0.2 part of sodium persulfate, 15 parts of sucrose ester, 2 parts of konjac flour, 2 parts of aluminum hydroxide ultrafine powder, 12 parts of sodium carboxymethylcellulose and 7 parts of polyaniline.
The preparation method of the adhesive comprises the following steps:
s1: the preparation method comprises the following steps of premixing aluminum hydroxide ultrafine powder, polyaniline and sodium carboxymethylcellulose, wherein the premixing method comprises the following steps: dispersing sodium carboxymethylcellulose in water to obtain a dispersion liquid with the mass percent of 1.0%, then adding aluminum hydroxide ultrafine powder and polyaniline, and stirring for 8min to obtain a mixed material;
s2: dividing urea into four parts according to the mass ratio of 10:7:3:2, adding formaldehyde into a reaction kettle, starting up to stir, adding ammonium chloride, uniformly mixing, adding concentrated sulfuric acid, and adjusting the pH value of a reaction solution to 2.0; then adding melamine, polyvinyl alcohol, sodium persulfate and the first part of urea into a reaction kettle, heating the reaction solution to 40 ℃, and stirring for 20min under the condition of heat preservation;
s3: heating the reaction solution to 90 ℃, adding sodium hydroxide to adjust the pH value of the reaction solution to 4.8, then adding lignin and a second part of urea, and stirring for 20min under heat preservation;
s4: cooling the reaction liquid to 82 ℃, and adding sodium hydroxide to adjust the pH value of the reaction liquid to 6.8; then adding sodium carboxymethylcellulose, tributyl citrate, a third part of urea and the mixed material, and stirring for 6min under heat preservation;
s5: cooling the reaction liquid to 55 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 8.8, then adding sucrose ester, konjac flour and the fourth part of urea, and stirring for 15min under heat preservation; and (5) cooling the reaction liquid to room temperature, adding the mixed material obtained in the step (S1), and uniformly stirring to obtain the catalyst.
Example 3
A preparation method of anti-corrosion finger-jointed board wood comprises the following steps:
s1: drying fresh eucalyptus grandis logs in the air, peeling, sawing into spare sawn timber, and drying until the water content is 12%;
s2: fixing the width and length of the spare sawn timber, cutting the spare sawn timber into finger joint pieces with required sizes, tenoning the finger joint pieces by using a tenoning machine, and performing tenon joint longitudinally on the tenoned finger joint pieces by using a butt joint machine to form long strips;
s3: gluing the side surface of the finger-jointed strip, splicing the finger-jointed strip into a plate in parallel by using a plate splicing machine, and drying the plate after the plate splicing is finished until the water content is 10%;
s4: sanding and edge cutting are carried out on the finger-jointed board by using a sander and a finishing saw; packaging and warehousing the qualified products;
the adhesive used for gluing is prepared from the following raw materials in parts by weight: 600 parts of formaldehyde, 220 parts of urea, 120 parts of melamine, 45 parts of lignin, 4.5 parts of polyvinyl alcohol, 1 part of ammonium chloride, 0.4 part of tributyl citrate, 0.3 part of potassium persulfate, 7 parts of sucrose ester, 4 parts of konjac flour, 4 parts of aluminum hydroxide ultrafine powder, 16 parts of sodium carboxymethylcellulose and 4 parts of polyaniline.
The preparation method of the adhesive comprises the following steps:
s1: the preparation method comprises the following steps of premixing aluminum hydroxide ultrafine powder, polyaniline and sodium carboxymethylcellulose, wherein the premixing method comprises the following steps: dispersing sodium carboxymethylcellulose in water to obtain a dispersion liquid with the mass percent of 1.2%, then adding aluminum hydroxide ultrafine powder and polyaniline, and stirring for 7min to obtain a mixed material;
s2: dividing urea into four parts according to the mass ratio of 10:4:5:1, adding formaldehyde into a reaction kettle, starting up to stir, adding ammonium chloride, uniformly mixing, adding concentrated sulfuric acid, and adjusting the pH value of a reaction solution to 2.2; then adding melamine, polyvinyl alcohol, potassium persulfate and the first part of urea into a reaction kettle, heating the reaction solution to 45 ℃, and stirring for 15min under the condition of heat preservation;
s3: heating the reaction liquid to 90 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 5.0, then adding lignin and a second part of urea, and stirring for 15min under heat preservation;
s4: cooling the reaction liquid to 83 ℃, and adding sodium hydroxide to adjust the pH value of the reaction liquid to 7.0; then adding sodium carboxymethylcellulose, tributyl citrate, a third part of urea and a mixed material, and stirring for 8min under heat preservation;
s5: cooling the reaction liquid to 70 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 9.2, then adding sucrose ester, konjac flour and the fourth part of urea, and stirring for 20min under heat preservation; and (5) cooling the reaction liquid to room temperature, adding the mixed material obtained in the step (S1), and uniformly stirring to obtain the catalyst.
Example 4
A preparation method of anti-corrosion finger-jointed board wood comprises the following steps:
s1: drying fresh eucalyptus grandis logs in the air, peeling, sawing into spare sawn timber, and drying until the water content is 11%;
s2: fixing the width and length of the spare sawn timber, cutting the spare sawn timber into finger joint pieces with required sizes, tenoning the finger joint pieces by using a tenoning machine, and performing tenon joint longitudinally on the tenoned finger joint pieces by using a butt joint machine to form long strips;
s3: gluing the side surface of the finger-jointed strip, splicing the finger-jointed strip into a plate in parallel by using a plate splicing machine, and drying the plate after the plate splicing is finished until the water content is 12%;
s4: sanding and edge cutting are carried out on the finger-jointed board by using a sander and a finishing saw; packaging and warehousing the qualified products;
the adhesive used for gluing is prepared from the following raw materials in parts by weight: 500 parts of formaldehyde, 180 parts of urea, 150 parts of melamine, 50 parts of lignin, 5 parts of polyvinyl alcohol, 4 parts of ammonium chloride, 0.7 part of tributyl citrate, 0.7 part of sodium persulfate, 7 parts of sucrose ester, 5 parts of konjac flour, 4 parts of aluminum hydroxide ultrafine powder, 14 parts of sodium carboxymethylcellulose and 6 parts of polyaniline.
The preparation method of the adhesive comprises the following steps:
s1: the preparation method comprises the following steps of premixing aluminum hydroxide ultrafine powder, polyaniline and sodium carboxymethylcellulose, wherein the premixing method comprises the following steps: dispersing sodium carboxymethylcellulose in water to obtain 0.8% dispersion liquid, adding aluminium hydroxide ultrafine powder and polyaniline, and stirring for 10min to obtain a mixed material;
s2: dividing urea into four parts according to the mass ratio of 5:3:2:1, adding formaldehyde into a reaction kettle, starting up to stir, adding ammonium chloride, uniformly mixing, adding concentrated sulfuric acid, and adjusting the pH value of a reaction solution to 2.2; then adding melamine, polyvinyl alcohol, sodium persulfate and the first part of urea into a reaction kettle, heating the reaction solution to 50 ℃, and stirring for 30min under the condition of heat preservation;
s3: heating the reaction liquid to 95 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 5.5, then adding lignin and a second part of urea, and stirring for 30min under heat preservation;
s4: cooling the reaction liquid to 86 ℃, and adding sodium hydroxide to adjust the pH value of the reaction liquid to 7.5; then adding sodium carboxymethylcellulose, tributyl citrate, a third part of urea and the mixed material, and stirring for 10min under heat preservation;
s5: cooling the reaction liquid to 65 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 9.0, then adding sucrose ester, konjac flour and the fourth part of urea, and stirring for 30min under heat preservation; and (5) cooling the reaction liquid to room temperature, adding the mixed material obtained in the step (S1), and uniformly stirring to obtain the catalyst.
Comparative example 1
Essentially the same as in example 3, except that tributyl citrate was not added to the adhesive preparation starting materials.
Comparative example 2
Essentially the same as in example 3, except that no sucrose ester was added to the adhesive preparation raw materials.
Comparative example 3
The procedure was substantially the same as in example 3, except that no konjac flour was added to the raw materials for preparing the adhesive.
Comparative example 4
The adhesive was prepared in substantially the same manner as in example 3, except that tributyl citrate, sucrose ester and konjac flour were not added to the raw materials for preparing the adhesive.
Comparative test of Performance
1. Measurement of bending Strength
Bending strength tests were performed on the finger-jointed boards prepared in examples 1 to 4 and comparative examples 1 to 4 of the same size by using a wood bending strength test method (GB/T1936.1-2009). The results are shown in Table 1.
TABLE 1 flexural Strength (tensile Strength) of finger-jointed boards
As can be seen from Table 1, the finger-jointed board plates prepared in the embodiments 1-4 of the invention have bending strength of more than 24MPa and better bending resistance;
as can be seen from the data of the example 3 and the comparative example 1, tributyl citrate is not added in the adhesive preparation raw materials, so that the bending strength is reduced by 2.3 MPa;
as can be seen from the data of the example 3 and the comparative example 2, the sucrose ester is not added in the raw materials for preparing the adhesive, so that the bending strength is reduced by 1.9 MPa;
as can be seen from the data of example 3 and comparative example 3, konjac flour is not added to the adhesive preparation raw materials, so that the bending strength is reduced by 2.5 MPa;
as can be seen from the data of example 3 and comparative example 4, when tributyl citrate, sucrose ester and konjac flour are simultaneously added to the adhesive preparation raw materials, the bending strength is reduced by 7.4 MPa;
therefore, the tributyl citrate acts independently and can improve the bending strength by 2.3 MPa; the bending strength can be improved by 1.9MPa by the single action of sucrose ester; the konjac flour acts independently, so that the bending strength can be improved by 2.5 MPa; the tributyl citrate, the sucrose ester and the konjac flour act together, so that the bending strength can be improved by 7.4 MPa; therefore, the bending strength improving effect is increased when the tributyl citrate, the sucrose ester and the konjac powder act together compared with the case that the tributyl citrate, the sucrose ester and the konjac powder act separately: [7.4- (2.3+1.9+2.5) ]/(2.3 +1.9+2.5) × 100% > 10.4% > 10%. Therefore, when the tributyl citrate, the sucrose ester and the konjac flour are used together, a synergistic effect is generated, and the bending strength of the finger-jointed board is synergistically improved.
2. Test for mildew resistance
The antibacterial properties of the finger-jointed boards prepared in examples 1 to 4 and comparative examples 1 to 4 were compared, the surface of the sample was observed with white cardboard as a control, and the growth time of the test bacteria was recorded, and the results are shown in table 2.
TABLE 2 results of the antifungal Properties test
As can be seen from Table 2, the finger-jointed boards prepared according to the present invention all had a certain antifungal activity as compared to the white cardboard. When tributyl citrate is not added into the adhesive preparation raw materials, the growth time of the test bacteria is delayed by 16 days compared with that of the control group; when sucrose ester is not added in the raw materials for preparing the adhesive, the time for the growth of the test bacteria is delayed by 11 days compared with the control group; when no konjac flour is added in the raw materials for preparing the adhesive, the time for the growth of the test bacteria is delayed by 18 days compared with the control group; when tributyl citrate, sucrose ester and konjac flour are not added into the adhesive preparation raw materials, the growth time of the test bacteria is delayed by 6 days compared with that of a control group. Therefore, when the adhesive preparation raw materials lack tributyl citrate, sucrose ester and konjac flour at the same time, the growth time of the bacteria is greatly shortened compared with the case that the adhesive preparation raw materials lack tributyl citrate, sucrose ester and konjac flour singly; when the three components are used together, no bacteria test growth occurs, and thus, the tributyl citrate, the sucrose ester and the konjac flour have a synergistic mildew-proof effect.
3. Test for flame retardancy
And testing according to the flame retardant performance test standard, wherein the standard is a flame retardant treated paperboard, and the product with the average carbonization degree of less than or equal to 11.50cm, the average flame holding time of less than or equal to 60s and the average flame burning time of less than or equal to 5s is a flame retardant product. The flame retardant properties of the finger joint boards prepared in examples 1 to 4 and comparative examples 1 to 4 of the same size were tested by a fire tube method, and the test results are shown in table 3 using a pine test piece as a control. The flame retardant properties of each group were investigated by the oxygen index method and the results are shown in Table 3.
TABLE 3 flame retardancy of wood by tube method
The pine test piece is burnt completely within 2 min; the carbonization length of the finger-jointed board prepared in the embodiment 1-4 in 4min is 110 mm. As can be seen from Table 4, the finger-jointed boards prepared in the embodiments 1 to 4 of the present invention satisfy the requirements that the mass loss rate is far less than 60% and the flaming combustion time is less than 4min, and can be defined as flame-retardant wood products.
TABLE 4 oxygen index method for testing flame retardancy of wood
Remarking: the ember time is short, the short carbonization length indicates good flame retardant effect, and the average carbonization length is less than 11.5cm, namely the product is qualified. The experimental data are average values of 10 tests.
Oxygen index up to 32 is a flame retardant material, depending on the wood burning grade. Table 4 shows that: firstly, pine test pieces are quickly burnt without flame resistance effect; the burning time, the flame-continuing time and the carbonization length of the finger-jointed boards prepared in the examples 1-4 are all less than the national standard values. ② the oxygen index of the finger-jointed board prepared by the embodiment 1-4 exceeds more than 50, and reaches the level of the flame-retardant grade wood. Therefore, the finger-jointed boards prepared in examples 1-4 have a good flame retardant effect.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The preparation method of the anti-corrosion finger-jointed board wood is characterized by comprising the following steps:
s1: airing, peeling and sawing fresh eucalyptus grandis logs into standby sawn timber, and then drying until the water content is 10-12%;
s2: fixing the width and length of the spare sawn timber, cutting the spare sawn timber into finger joint pieces with required sizes, tenoning the finger joint pieces by using a tenoning machine, and performing tenon joint longitudinally on the tenoned finger joint pieces by using a butt joint machine to form long strips;
s3: gluing the side surfaces of the finger-jointed strips, splicing the finger-jointed strips into boards in parallel by using a board splicing machine, and drying the boards until the water content is 8-12% after the boards are spliced;
s4: sanding and edge cutting are carried out on the finger-jointed board by using a sander and a finishing saw; packaging and warehousing the qualified products;
the adhesive used for gluing is prepared from the following raw materials in parts by weight: 300-600 parts of formaldehyde, 150-250 parts of urea, 50-150 parts of melamine, 30-50 parts of lignin, 3-5 parts of polyvinyl alcohol, 1-5 parts of ammonium chloride, 5-15 parts of sucrose ester, 1-5 parts of konjac flour, 0.2-0.9 part of tributyl citrate, 0.2-0.8 part of initiator, 1-5 parts of aluminum hydroxide ultrafine powder, 10-16 parts of sodium carboxymethylcellulose and 4-7 parts of polyaniline.
2. The preparation method of the anti-corrosion finger-jointed board wood according to claim 1, wherein the adhesive is prepared from the following raw materials in parts by weight: 400-500 parts of formaldehyde, 180-220 parts of urea, 80-120 parts of melamine, 35-45 parts of lignin, 3.5-4.5 parts of polyvinyl alcohol, 2-4 parts of ammonium chloride, 7-12 parts of sucrose ester, 2-4 parts of konjac flour, 0.4-0.7 part of tributyl citrate, 0.3-0.7 part of initiator, 2-4 parts of aluminum hydroxide ultrafine powder, 12-14 parts of sodium carboxymethylcellulose and 5-6 parts of polyaniline.
3. The method for preparing the anti-corrosion finger-jointed board wood according to claim 1, wherein the method comprises the following steps: the initiator is persulfate.
4. The preparation method of the anti-corrosion finger-jointed board wood according to any one of claims 1 to 3, wherein the preparation method of the adhesive comprises the following steps:
s1: pre-mixing aluminum hydroxide ultrafine powder, polyaniline and sodium carboxymethylcellulose to obtain a mixed material;
s2: dividing urea into four parts, adding formaldehyde into a reaction kettle, starting up the reaction kettle, stirring, adding ammonium chloride, uniformly mixing, and adding concentrated sulfuric acid to adjust the pH value of a reaction solution to 1.8-2.2; adding melamine, polyvinyl alcohol, an initiator and a first part of urea into a reaction kettle, heating the reaction solution to 30-50 ℃, and stirring for 10-30 min under heat preservation;
s3: heating the reaction liquid to 88-95 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 4.5-5.5, then adding lignin and a second part of urea, and stirring for 10-30 min under heat preservation;
s4: cooling the reaction liquid to 80-86 ℃, and adding sodium hydroxide to adjust the pH value of the reaction liquid to 6.5-7.5; then adding sodium carboxymethylcellulose, tributyl citrate, a third part of urea and a mixed material, and stirring for 5-10 min under heat preservation;
s5: cooling the reaction liquid to 50-70 ℃, adding sodium hydroxide to adjust the pH value of the reaction liquid to 8.5-9.2, then adding sucrose ester, konjac flour and a fourth part of urea, and stirring for 10-30 min under heat preservation; and (5) cooling the reaction liquid to room temperature, adding the mixed material obtained in the step (S1), and uniformly stirring to obtain the catalyst.
5. The preparation method of the anti-corrosion finger-jointed board wood according to claim 4, wherein the preparation method comprises the following steps: in the step S1, the mass ratio of the four parts of urea is 10: 3-7: 2-5: 1-2.
6. The method for preparing the anti-corrosion fingerboard wood according to claim 4, wherein in the step S2, the method for pre-mixing the aluminum hydroxide ultra-fine powder, the polyaniline and the sodium carboxymethyl cellulose comprises the following steps: dispersing sodium carboxymethylcellulose in water to obtain a dispersion solution, adding aluminum hydroxide ultrafine powder and polyaniline, and stirring for 5-10 min.
7. The preparation method of the anti-corrosion finger-jointed board wood according to claim 6, wherein the preparation method comprises the following steps: the mass percentage of the sodium carboxymethylcellulose in the dispersion liquid is 0.8-1.2%.
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