CN111303798A - Formaldehyde-free adhesive for artificial board and preparation method thereof - Google Patents
Formaldehyde-free adhesive for artificial board and preparation method thereof Download PDFInfo
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- CN111303798A CN111303798A CN201911188939.4A CN201911188939A CN111303798A CN 111303798 A CN111303798 A CN 111303798A CN 201911188939 A CN201911188939 A CN 201911188939A CN 111303798 A CN111303798 A CN 111303798A
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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
- C09J105/00—Adhesives based on polysaccharides or on their derivatives, not provided for in groups C09J101/00 or C09J103/00
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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
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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
- C09J11/06—Non-macromolecular additives organic
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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
- C09J11/08—Macromolecular additives
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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
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- 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
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Abstract
The invention relates to the technical field of adhesives, in particular to a formaldehyde-free adhesive for an artificial board and a preparation method thereof. The formaldehyde-free adhesive for the artificial board comprises the main raw materials of biomass gum, sodium borate, ethylene glycol, polyvinyl alcohol, urea, glycerol and water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 7-9: 3-5: 1-3. According to the formaldehyde-free adhesive for the artificial board and the preparation method thereof, formaldehyde is not doped, the activity of the locust bean gum and the tamarind gum is enhanced after swelling, the texture is more delicate, the locust bean gum and the tamarind gum are uniform and non-dispersed, and the exquisite uniformity of the gum is enhanced, the Caesalpinia spinosa gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea, the glycerol and the water are mixed and then atomized and sprayed into the homogeneous gum solution containing the locust bean gum and the tamarind gum in a stirring state at 85-90 ℃, so that the full mixing and the rapid and uniform distribution of all substances are facilitated, and the viscosity of the gum is rapidly increased in.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a formaldehyde-free adhesive for an artificial board and a preparation method thereof.
Background
The adhesive industry is one of the fine chemical industries which develop rapidly in the world, is more and more concerned by all countries in the world along with the development of economy and the enhancement of environmental protection consciousness of people, is used as a multi-industry common product and technology, has brand new social requirements on adhesive performances such as non-toxicity, harmlessness, environmental friendliness, degradability and the like, obtains various green adhesive products and technologies which have high environmental compatibility, low manufacturing cost, economy and practicability by taking natural biomass materials as raw materials, and becomes a research hotspot in the field of current adhesives.
Most of adhesives for wood bonding contain formaldehyde, and wood products containing formaldehyde can cause serious influence on human health; the biomass adhesive without formaldehyde is an important research direction.
In a soybean-based formaldehyde-free adhesive and an application method thereof disclosed in chinese patent application CN106590523A, the soybean-based formaldehyde-free adhesive comprises the following components by mass percent: 30-90% of soybean gum and 10-70% of inorganic glue. The adhesive has high bonding strength and good water resistance, can effectively reduce the production cost, and has excellent market popularization and application prospects in the artificial board industry and the furniture manufacturing industry. However, the adhesive still has the defects of slightly improved viscosity and weak bonding strength to wood boards.
Disclosure of Invention
The invention aims to provide a formaldehyde-free adhesive for an artificial board and a preparation method thereof, which overcome the defects of the prior art and improve the viscosity of the formaldehyde-free adhesive and the adhesive strength of the formaldehyde-free adhesive to the artificial board.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a formaldehyde-free adhesive for artificial boards is prepared from biomass gum, sodium borate, ethylene glycol, polyvinyl alcohol, urea, glycerol and water as main raw materials, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is (7-9): (3-5): (1-3).
Preferably, the raw materials are added in parts by weight as follows: 20-30 parts of biomass glue, 1-5 parts of sodium borate, 10-15 parts of ethylene glycol, 8-12 parts of polyvinyl alcohol, 8-15 parts of urea, 5-10 parts of glycerol and 50-100 parts of water.
Preferably, the preparation method of the tamarind gum mainly comprises the following steps: pulverizing tamarind seed to 80-100 mesh, mixing the pulverized tamarind seed powder with water at a weight ratio of (1-3): 8, stirring for 10-15min at the temperature of 85-90 ℃ at 135r/min, filtering, collecting filtrate, concentrating to 1/3-1/5 of the original volume, mixing the filtrate with ethanol according to the volume ratio of 1 (2.2-2.5), carrying out alcohol precipitation, filtering, collecting precipitate after the alcohol precipitation is finished, dehydrating and drying the precipitate at the temperature of 90-100 ℃ until the water content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the product.
A preparation method of a formaldehyde-free adhesive for artificial boards comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and tamarind gum under the pressure of 30-35MPa and the temperature of 40-45 ℃ to obtain puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum expanded in the step (1) into a reaction kettle, weighing water in specified weight parts, placing 7/10 water into the reaction kettle, stirring at normal temperature for 135r/min, heating while stirring, heating to 85-90 ℃ at the speed of 5 ℃/min, preserving heat for 20-30min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring at the normal temperature of 180-;
(4) and (4) continuing stirring the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 300-350r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 25-30 ℃ to obtain the catalyst.
The invention has the beneficial effects that: compared with the prior art, the formaldehyde-free adhesive for the artificial board and the preparation method thereof do not mix formaldehyde, and the adhesive which has uniform colloid, high viscoelasticity and firm adhesion to the artificial board is formed by compounding the optimized locust bean gum, the taraxacum gum and the tamarind gum and cooperating with the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea, the glycerol and the water; the locust bean gum and tamarind gum have enhanced activity after being puffed, are more delicate in texture, are beneficial to uniform and non-dispersed, and enhance the delicate and uniform degree of colloid, and the spruce gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea, the glycerol and the water are mixed and atomized and sprayed into the homogeneous gum solution containing the locust bean gum and the tamarind gum in a stirring state at 85-90 ℃, so that the locust bean gum and the tamarind gum are beneficial to full mixing and rapid and uniform distribution among all substances, and the viscosity of the colloid is rapidly increased in the spraying and cooling process.
Detailed Description
Example 1
A formaldehyde-free adhesive for artificial boards is mainly composed of the following raw materials in parts by weight: 25 parts of biomass gum, 4 parts of sodium borate, 12 parts of ethylene glycol, 10 parts of polyvinyl alcohol, 12 parts of urea, 7 parts of glycerol and 80 parts of water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 8: 3: in this embodiment, the preparation method of tamarind gum mainly includes the following steps: pulverizing tamarind seeds to 80-100 meshes, mixing the pulverized tamarind seed powder with water according to a weight ratio of 1:4, stirring at 85 ℃ for 12min at 120r/min, filtering, collecting filtrate, concentrating to 1/4 of the original volume, mixing with ethanol according to a volume ratio of 1:2.3 after concentrating, carrying out alcohol precipitation, filtering, collecting precipitate after the alcohol precipitation is finished, dehydrating and drying the precipitate at 95 ℃ until the water content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the tamarind seed powder.
A preparation method of a formaldehyde-free adhesive for artificial boards comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and the tamarind gum under the pressure of 33MPa and the temperature of 42 ℃ to obtain the puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum puffed in the step (1) into a reaction kettle, weighing water in a specified weight part, placing 7/10 water into the reaction kettle, stirring at normal temperature for 120r/min, heating while stirring, heating to 85 ℃ at a speed of 5 ℃/min, preserving heat for 25min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring at normal temperature for 30min at 200r/min, conveying the stirred mixed solution to an atomizing nozzle for atomizing, and spraying the atomized micro liquid drops into the mixture of the locust bean gum and the tamarind gum in the heat preservation state in the step (2);
(4) and (4) continuing stirring the inside of the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 330r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 28 ℃, thus obtaining the product.
Example 2
A formaldehyde-free adhesive for artificial boards is characterized in that: the material mainly comprises the following raw materials in parts by weight: 20 parts of biomass gum, 1 part of sodium borate, 10 parts of ethylene glycol, 8 parts of polyvinyl alcohol, 8 parts of urea, 5 parts of glycerol and 50 parts of water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 7: 2: 1.
in this embodiment, the preparation method of tamarind gum mainly includes the following steps: taking tamarind seeds, crushing the tamarind seeds into 80-100 meshes, and mixing the crushed tamarind seed powder and water according to a weight ratio of 1: 8, mixing, stirring at 85 ℃ for 15min at 100r/min, filtering, collecting filtrate, concentrating to 1/3 of the original volume, mixing with ethanol according to the volume ratio of 1:2.3 after concentrating, carrying out ethanol precipitation, filtering and collecting precipitate after the ethanol precipitation is finished, dehydrating and drying the precipitate at 90 ℃ until the moisture content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the traditional Chinese medicine composition.
A preparation method of a formaldehyde-free adhesive for artificial boards comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and the tamarind gum under the pressure of 30MPa and the temperature of 40 ℃ to obtain the puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum puffed in the step (1) into a reaction kettle, weighing water in specified weight parts, placing 7/10 water into the reaction kettle, stirring at normal temperature for 100r/min, heating while stirring, heating to 85 ℃ at the speed of 5 ℃/min, preserving heat for 20min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring for 40min at the normal temperature of 180r/min, conveying the stirred mixed solution to an atomizing nozzle for atomizing, and spraying the atomized micro liquid drops into the mixture of the locust bean gum and the tamarind gum in the heat preservation state in the step (2);
(4) and (4) continuing stirring the inside of the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 300r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 25 ℃, thus obtaining the product.
Example 3
A formaldehyde-free adhesive for artificial boards is mainly composed of the following raw materials in parts by weight: 30 parts of biomass gum, 5 parts of sodium borate, 15 parts of ethylene glycol, 12 parts of polyvinyl alcohol, 15 parts of urea, 10 parts of glycerol and 100 parts of water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 9: 5: 3.
in this embodiment, the preparation method of tamarind gum mainly includes the following steps: taking tamarind seeds, crushing the tamarind seeds into 80-100 meshes, and mixing the crushed tamarind seed powder and water according to a weight ratio of 3: 8, mixing, stirring at 85 ℃ for 10min at 135r/min, filtering, collecting filtrate, concentrating to 1/5 of the original volume, mixing with ethanol according to the volume ratio of 1:2.5 after concentrating, carrying out alcohol precipitation, filtering and collecting precipitate after the alcohol precipitation is finished, dehydrating and drying the precipitate at 100 ℃ until the water content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the compound.
A preparation method of a formaldehyde-free adhesive for artificial boards comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and the tamarind gum under the pressure of 35MPa and the temperature of 45 ℃ to obtain the puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum puffed in the step (1) into a reaction kettle, weighing water in a specified weight part, placing 7/10 water into the reaction kettle, stirring at normal temperature of 135r/min, heating while stirring, heating to 85 ℃ at a speed of 5 ℃/min, preserving heat for 20min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring for 20min at the normal temperature of 220r/min, conveying the stirred mixed solution to an atomizing nozzle for atomizing, and spraying the atomized micro liquid drops into the mixture of the locust bean gum and the tamarind gum in the heat preservation state in the step (2);
(4) and (4) continuing stirring the inside of the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 350r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 30 ℃ to obtain the product.
Example 4
A formaldehyde-free adhesive for artificial boards is mainly composed of the following raw materials in parts by weight: 22 parts of biomass gum, 2 parts of sodium borate, 11 parts of ethylene glycol, 9 parts of polyvinyl alcohol, 10 parts of urea, 7 parts of glycerol and 60 parts of water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 7: 5: 2.
in this embodiment, the preparation method of tamarind gum mainly includes the following steps: taking tamarind seeds, crushing the tamarind seeds into 80-100 meshes, and mixing the crushed tamarind seed powder and water according to a weight ratio of 1: 8, mixing, stirring for 14min at 82 ℃ at 110r/min, filtering, collecting filtrate, concentrating to 1/3 of the original volume, mixing with ethanol according to the volume ratio of 1:2.4 after concentrating, carrying out ethanol precipitation, filtering and collecting precipitate after the ethanol precipitation is finished, dehydrating and drying the precipitate at 95 ℃ until the water content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the product.
A preparation method of a formaldehyde-free adhesive for artificial boards comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and the tamarind gum under the pressure of 32MPa and the temperature of 42 ℃ to obtain the puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum puffed in the step (1) into a reaction kettle, weighing water in a specified weight part, placing 7/10 water into the reaction kettle, stirring at normal temperature for 110r/min, heating while stirring, heating to 85 ℃ at the speed of 5 ℃/min, preserving heat for 22min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring at the normal temperature of 190r/min for 35min, conveying the stirred mixed solution to an atomizing nozzle for atomizing, and spraying the atomized micro liquid drops into the mixture of the locust bean gum and the tamarind gum in the heat preservation state in the step (2);
(4) and (4) continuing stirring the inside of the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 310r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 26 ℃ to obtain the catalyst.
Example 5
A formaldehyde-free adhesive for artificial boards is mainly composed of the following raw materials in parts by weight: 28 parts of biomass gum, 4 parts of sodium borate, 14 parts of ethylene glycol, 11 parts of polyvinyl alcohol, 13 parts of urea, 8 parts of glycerol and 80 parts of water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 9: 4: 2.
in this embodiment, the preparation method of tamarind gum mainly includes the following steps: taking tamarind seeds, crushing the tamarind seeds into 80-100 meshes, and mixing the crushed tamarind seed powder and water according to a weight ratio of 3: 8, mixing, stirring at 90 ℃ for 12min at 130r/min, filtering, collecting filtrate, concentrating to 1/4 of the original volume, mixing with ethanol according to the volume ratio of 1:2.4 after concentrating, carrying out ethanol precipitation, filtering and collecting precipitate after the ethanol precipitation is finished, dehydrating and drying the precipitate at 98 ℃ until the moisture content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the product.
A preparation method of a formaldehyde-free adhesive for artificial boards comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and the tamarind gum under the pressure of 34MPa and the temperature of 43 ℃ to obtain the puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum puffed in the step (1) into a reaction kettle, weighing water in a specified weight part, placing 7/10 water into the reaction kettle, stirring at normal temperature for 130r/min, heating while stirring, heating to 88 ℃ at a speed of 5 ℃/min, preserving heat for 22min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring at the normal temperature of 210r/min for 25min, conveying the stirred mixed solution to an atomizing nozzle for atomizing, and spraying the atomized micro liquid drops into the mixture of the locust bean gum and the tamarind gum in the heat preservation state in the step (2);
(4) and (4) continuing stirring the inside of the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 340r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 29 ℃, thus obtaining the product.
Comparative example 1
The formaldehyde-free adhesive for artificial boards of comparative example 1 is substantially the same as that of example 1, except that: the weight ratio of the locust bean gum to the taraxacum gum to the tamarind gum is 1:1: 1.
The preparation method of the formaldehyde-free adhesive for the artificial board in the comparative example 1 is the same as that of the example 1.
Comparative example 2
The formaldehyde-free adhesive for artificial boards of comparative example 2 is substantially the same as that of example 1, except that: the tamarind gum is purchased.
The preparation method of the formaldehyde-free adhesive for the artificial board in the comparative example 2 is the same as that of the example 1.
Comparative example 3
A formaldehyde-free adhesive for artificial boards of comparative example 3 was the same as in example 1.
The preparation method of the formaldehyde-free adhesive for the artificial board in the comparative example 3 comprises the following steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and the tamarind gum under the pressure of 33MPa and the temperature of 42 ℃ to obtain the puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum puffed in the step (1) into a reaction kettle, weighing water in a specified weight part, placing 7/10 water into the reaction kettle, stirring at normal temperature for 120r/min, heating while stirring, heating to 85 ℃ at a speed of 5 ℃/min, preserving heat for 25min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring at normal temperature for 30min at 200r/min, and pouring the stirred mixed solution into the mixture of the locust bean gum and the tamarind gum in the heat preservation state in the step (2);
(4) and (4) continuing stirring the inside of the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 330r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 28 ℃, thus obtaining the product.
Experimental example 1
The appearance, viscosity, dry bonding strength, wet bonding strength, hot pressing time and free formaldehyde of the formaldehyde-free adhesives for artificial boards prepared in experimental examples 1 to 5 and comparative examples 1 to 3 were measured, and the measurement results are shown in table 1:
TABLE 1
As can be seen from Table 1, the formaldehyde-free adhesive for artificial boards prepared in the embodiments 1 to 5 of the present invention does not contain coarse particles, has fine and uniform texture, has a viscosity of 36 to 39Pa.s, a dry bonding strength of 16 to 18MPa, a wet bonding strength of 13 to 15MPa, a hot pressing time of 2.5 to 3min, and no release of free formaldehyde; the formaldehyde-free adhesive for the artificial board prepared in the comparative example 1 has the performance far lower than that of the embodiment of the invention because the optimized biomass adhesive proportion of the invention is not adopted; the formaldehyde-free adhesive for the artificial board prepared in the comparison document 2 has the performance far lower than that of the embodiment of the invention because tamarind gum adopted is purchased and the preparation method of the tamarind gum is not adopted; in the preparation method of comparative example 3, the Caesalpinia spinosa Gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol are mixed and then directly added into the reaction kettle without atomization, so that the performance of the preparation method is far lower than that of the preparation method of the embodiment of the invention. In conclusion, the formaldehyde-free adhesive for artificial boards and the preparation method thereof do not contain formaldehyde, and the adhesive which has uniform colloid, high viscoelasticity and firm adhesion to the artificial boards is formed by compounding the optimized locust bean gum, the taraxacum gum and the tamarind gum and cooperating with the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea, the glycerol and the water; the locust bean gum and tamarind gum have enhanced activity after being puffed, are more delicate in texture, are beneficial to uniform and non-dispersed, and enhance the delicate and uniform degree of colloid, and the spruce gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea, the glycerol and the water are mixed and atomized and sprayed into the homogeneous gum solution containing the locust bean gum and the tamarind gum in a stirring state at 85-90 ℃, so that the locust bean gum and the tamarind gum are beneficial to full mixing and rapid and uniform distribution among all substances, and the viscosity of the colloid is rapidly increased in the spraying and cooling process.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A formaldehyde-free adhesive for artificial boards is characterized in that: the main raw materials are biomass gum, sodium borate, ethylene glycol, polyvinyl alcohol, urea, glycerol and water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is (7-9): (3-5): (1-3).
2. The formaldehyde-free adhesive for artificial boards according to claim 1, wherein the formaldehyde-free adhesive comprises: the weight parts of the raw materials are as follows: 20-30 parts of biomass glue, 1-5 parts of sodium borate, 10-15 parts of ethylene glycol, 8-12 parts of polyvinyl alcohol, 8-15 parts of urea, 5-10 parts of glycerol and 50-100 parts of water.
3. The formaldehyde-free adhesive for artificial boards according to claim 1, wherein the formaldehyde-free adhesive comprises: the preparation method of the tamarind gum mainly comprises the following steps: pulverizing tamarind seed to 80-100 mesh, mixing the pulverized tamarind seed powder with water at a weight ratio of (1-3): 8, stirring for 10-15min at the temperature of 85-90 ℃ at 135r/min, filtering, collecting filtrate, concentrating to 1/3-1/5 of the original volume, mixing the filtrate with ethanol according to the volume ratio of 1 (2.2-2.5), carrying out alcohol precipitation, filtering, collecting precipitate after the alcohol precipitation is finished, dehydrating and drying the precipitate at the temperature of 90-100 ℃ until the water content is less than 6%, and pulverizing the dried precipitate to 60 meshes to obtain the product.
4. The method for preparing the formaldehyde-free adhesive for the artificial board according to claim 1, wherein the method comprises the following steps: the preparation method comprises the following preparation steps:
(1) weighing locust bean gum and tamarind gum in specified weight parts, and extruding and puffing the locust bean gum and tamarind gum under the pressure of 30-35MPa and the temperature of 40-45 ℃ to obtain puffed locust bean gum and tamarind gum;
(2) placing the locust bean gum and the tamarind gum expanded in the step (1) into a reaction kettle, weighing water in specified weight parts, placing 7/10 water into the reaction kettle, stirring at normal temperature for 135r/min, heating while stirring, heating to 85-90 ℃ at the speed of 5 ℃/min, preserving heat for 20-30min, and continuously stirring in the heat preservation process;
(3) weighing and mixing the tara gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea and the glycerol in specified weight parts, adding the water of 3/10 remained in the step (2) into the mixture, stirring at the normal temperature of 180-;
(4) and (4) continuing stirring the reaction kettle after the operation of the step (3) is finished, wherein the stirring speed is 300-350r/min, and stirring until the temperature of the materials in the reaction kettle is reduced to 25-30 ℃ to obtain the catalyst.
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| CN116289326A (en) * | 2023-01-05 | 2023-06-23 | 贵州盛世荣创再生科技有限公司 | Paper packing belt and preparation method thereof |
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