AU2020100659A4 - Adhesive, preparation method thereof, and use of the same in vegetable fiberboard or artificial board - Google Patents

Adhesive, preparation method thereof, and use of the same in vegetable fiberboard or artificial board Download PDF

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AU2020100659A4
AU2020100659A4 AU2020100659A AU2020100659A AU2020100659A4 AU 2020100659 A4 AU2020100659 A4 AU 2020100659A4 AU 2020100659 A AU2020100659 A AU 2020100659A AU 2020100659 A AU2020100659 A AU 2020100659A AU 2020100659 A4 AU2020100659 A4 AU 2020100659A4
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Prior art keywords
adhesive
parts
brine
sodium silicate
magnesium
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AU2020100659A
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Xingong Li
Xiaomei Liu
Yan QING
Yiqiang Wu
Xinli Zhang
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Central South University of Forestry and Technology
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Central South University of Forestry and Technology
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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
    • C09J1/00—Adhesives based on inorganic constituents
    • C09J1/02—Adhesives based on inorganic constituents containing water-soluble alkali silicates
    • 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
    • C09J11/08—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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/30—Presence of wood
    • C09J2400/303—Presence of wood in the substrate
    • 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
    • C09J2405/00—Presence of polysaccharides
    • 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
    • C09J2429/00—Presence of polyvinyl alcohol

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The present invention discloses an adhesive which is mainly prepared from the following components in parts by mass: 50-60 parts of an aqueous solution of sodium silicate; 10-20 parts of a brine; 20-30 parts of a nano silicon dioxide; 6-8 parts of a filler; 0.4-0.6 parts of a modifier and 0.1-0.3 parts of a stabilizer. A method for preparing the adhesive includes: firstly mixing to dissolve magnesium chloride and magnesium sulfate according to a certain molar ratio, and then obtaining a brine after stirring thoroughly; adding an aqueous solution of sodium silicate into the prepared brine, and then adding a nano silicon dioxide into the prepared sodium silicate-brine mixture to obtain a mixture; adding a filler into the mixture, and uniformly stirring to obtain a semi-finished product; and adding a modifier and a stabilizer into the semi-finished product to obtain a finished product of the adhesive. The adhesive of the present invention can be used as an inorganic adhesive in a vegetable fiberboard or artificial board, has the advantages of no pollutant release, low cost and the like, can obviously improve the strength, flame resistance and water resistance of a product and reduce the brittleness of the product.

Description

ADHESIVE, PREPARATION METHOD THEREOF, AND USE OF
THE SAME IN VEGETABLE FIBERBOARD OR ARTIFICIAL
BOARD
TECHNICAL FIELD
The present invention belongs to the technical field of wood adhesives, and particularly relates to an adhesive and a preparation method and use thereof.
BACKGROUD
China's forest coverage rate only accounts for 61.3% of the world's forest coverage rate, ranking 139th in the world. China's average coverage of forest for each person is equivalent to 21.3% of the world's average coverage of forest for each person, and China's average forest growing stock for each person is only 1/8 of the world's average forest growing stock for each person. China's forest coverage rate is only 16.5%. Obviously, China is a country with quite scarce forest resources. Therefore, it is urgent to comprehensively develop and utilize other biomass resources to replace the forest resources.
In China which is a large agricultural country, plant fibers as represented by crop straws, has great production, wide distribution and numerous varieties. The annual output of crop straws is about 700 million tons, of which only about 2.5% can be utilized after technical treatment. Because these plant fibers have not been fully and reasonably utilized, and the phenomena of random disposal and incineration are serious, this not only causes serious environmental pollution, but also leads to a huge waste of resources. Therefore, accelerating the comprehensive utilization of crop straws is of great significance for stabilizing agricultural ecological balance, easing resource constraints and reducing environment stress.
At present, some of the crop straw resources have already been used for producing vegetable fiberboards. Since the price of isocyanate, which is widely used as an adhesive in the currently produced vegetable fiberboards, is expensive and thus results in high bonding cost of the boards, and such boards have the technical problems of flammability, moisture absorption, high energy consumption in the forming stage, etc., this further restricts the development of the vegetable fiberboard industry. Therefore, it is extremely urgent to develop an environment-friendly adhesive for vegetable fibers with both high strength and flame resistance, low price and low energy consumption in board production.
SUMMARY i
2020100659 29 Apr 2020
The technical problem to be solved by the present invention is to overcome the defects of the prior art, providing an adhesive which has no pollutant release, low cost and can obviously improve the strength, flame resistance and water resistance of the product, and also providing a method for preparing the adhesive that is simple, convenient, and can be industrially operated, 5 and also providing use of the adhesive in a vegetable fiberboard or artificial board.
In order to solve the aforementioned technical problems, the technical solution provided by the present invention is an adhesive which is mainly prepared from the following components in parts by mass:
an aqueous solution of sodium silicate: 50-60 parts;
a brine: 10-20 parts;
a nano silicon dioxide: 15-25 parts;
a filler: 6-8 parts;
a crosslinking agent: 5-7 parts;
a modifier: 0.4-0.6 parts; and a stabilizer: 0.1-0.3 parts.
The selection of the modulus of sodium silicate (i.e. the ratio of SiO2 to Na2O) is one of the key factors in the development of the adhesive, because it directly affects the stability and bonding strength of the adhesive. When the modulus increases, the stability decreases; and when the modulus decreases, the bonding strength also decreases. The bonding strength and 0 stability can be guaranteed only under the optimal modulus. In the aforementioned adhesive, preferably the modulus of the solute sodium silicate in the aqueous solution of sodium silicate is 2.8-3.2. The aqueous solution of sodium silicate is a pale yellow transparent solution.
In the aforementioned adhesive, preferably the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium 25 sulfate in the brine is 2.5-3.5:1, and the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 7%-9%. A magnesium chloride hexahydrate is generally selected for the magnesium chloride, and a magnesium sulfate heptahydrate with a MgSCfi content > 97% can be selected for the magnesium sulfate. The specially-made brine of the present invention can greatly improve the flame resistance of the bonded product.
In the aforementioned adhesive, preferably the purity of the nano silicon dioxide is greater than 99.99%, and the moisture content of the nano silicon dioxide is < 0.01%.
In the aforementioned adhesive, preferably the filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminum oxide in a mass ratio of 2-4:1:1. The filler in the present invention can not only play the role of a skeleton substance, but also play the role of a curing agent in the adhesive formula.
I In the aforementioned adhesive, preferably the crosslinking agent is a polyvinyl alcohol
I liquid with medium viscosity. The preparation method is dissolving polyvinyl alcohol with an average molecular weight between 110,000-130,000 in hot water, and then formulating into a i 5 liquid with a solid content of 40%-60%. The preferred crosslinking agent in the present j invention can enable the aforementioned magnesium-containing inorganic component and the vegetable fibers to be better glued into a board, thereby improving the bonding strength and ' elastic modulus of the board.
I
J In the aforementioned adhesive, preferably the modifier is a mixture of trisodium , 0 phosphate and lithopone, and the mixing mass ratio of trisodium phosphate and lithopone is
I 1:4-2. The preferred modifier of the present invention can form a layer of extremely thin
I hydrophobic film on the pore wall, pore and cavity wall inside the product and on the outer surface of the product, thereby preventing the occurrence of a moisture absorption and dehylogenation process of the product and further improving the heat resistance of the adhesive 5 to a certain extent.
In the aforementioned adhesive, preferably the stabilizer is sodium carboxymethylcellulose. The preferred sodium carboxymethyl cellulose has a short molecular chain, and the addition of it can significantly improve the uniformity of the mixture, which not only greatly improves the stability of the adhesive solution, but also endows it with better weather resistance and 0 high-temperature resistance performances.
In the aforementioned adhesive, preferably the adhesive is an inorganic adhesive free of organic substances.
As a general technical concept, the present invention also provides a method for preparing the aforementioned adhesive, which includes the following steps:
(1) mixing to dissolve magnesium chloride and magnesium sulfate in water according to a certain molar ratio, and obtaining a brine after stirring thoroughly (pale yellow and slightly transparent);
(2) adding an aqueous solution of sodium silicate in the parts by mass into the brine prepared in the step (1) to obtain a slightly viscous sodium silicate-brine mixture;
(3) adding a nano silicon dioxide in the parts by mass into the sodium silicate-brine mixture prepared in the step (2);
(4) adding a filler in the parts by mass into the mixture obtained in the step (3), and uniformly stirring to obtain a semi-finished product; and (5) adding a crosslinking agent, a modifier and a stabilizer into the semi-finished product
2020100659 29 Apr 2020 obtained in the step (4) to obtain a finished product of the adhesive.
In the aforementioned preparation method, preferably in the step (2), the aqueous solution of sodium silicate is slowly added dropwise into the brine prepared in the step (1), and the brine is in a stirring state during and after the dropwise adding process, the stirring speed is controlled 5 at 120 r/min-140 r/min, and the stirring time is not less than 30 min.
In the aforementioned preparation method, preferably in the step (4) the filler includes copper oxide, magnesium oxide and aluminum oxide, and the particle size of the filler is less than 200 meshes (passing through a 200-mesh sieve); the magnesium oxide is 85% light calcined magnesia (beige), wherein the content of active magnesium oxide is more than 65%, 0 with a loss on ignition < 8.
As a general technical concept, the present invention also provides use of the adhesive as an inorganic adhesive in a vegetable fiberboard or artificial board.
The technical solution of the present invention creatively provides an inorganic adhesive with functional superposition and complementary types, and the inorganic adhesive with the 5 functional superposition advantage is applied to the field of manufacturing artificial boards or vegetable fiberboards. Through the aforementioned multi-component compound preparation, on one hand, the toughness and bonding strength of the inorganic bonding system can be greatly improved, and on the other hand, gaps in the vegetable fibers can be fully filled to form an interweaved compact and gapless composite material, which not only maintains the advantages 0 of no release of formaldehyde and other organic pollutants, but also has a low cost, and further can improve the flame resistance and water resistance performances of the product.
As compared with the prior art, the advantages of the present invention are:
1) the main raw materials (such as sodium silicate, nano silicon dioxide, copper oxide, magnesium oxide, magnesium chloride and the like) used in the present invention have the characteristics of no toxicity and no pollution, thereby ensuring the environmental-friendly performance of the adhesive;
2) through the compounding of multiple components and the synergistic effect of the modifier, the stabilizer and the like, the high strength, low brittleness and strong water resistance of the adhesive are organically unified;
3) the preparation process of the inorganic adhesive of the present invention is simple and convenient; when in use, the inorganic adhesive only needs to be directly added and stirred, which is convenient for realizing large-scale industrial production and application; and
4) the inorganic adhesive of the present invention can be applied to all vegetable fiber bonding fields, and the prepared board has excellent performances such as no formaldehyde release, a stable size, a high strength, strong water resistance, no combustion, no fuming and the [ like.
I
Lh ! 5 DESCRIPTION OF THE EMBODIMENTS
I Unless otherwise defined, all technical terms used hereinafter have the same meanings as commonly understood by those skilled in the art. The technical terms used herein is only for the
I purpose of describing specific embodiments, and is not intended to limit the claimed scope of >
i the present invention.
i 0 Unless otherwise specified, various reagents and raw materials used in the present I invention are commodities that can be purchased from the market or products that can be I prepared by well-known methods.
The specific embodiments of the present invention are as follows:
an adhesive, which is mainly prepared from the following components in parts by mass:
an aqueous solution of sodium silicate: 50-60 parts, wherein the modulus of the solute sodium silicate in the aqueous solution of sodium silicate is 2.8-3.2;
a brine: 10-20 parts, wherein the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and the total mass concentration of magnesium chloride and magnesium sulfate in 0 the brine is 8%, a magnesium chloride hexahydrate is generally selected for the magnesium chloride, and a magnesium sulfate heptahydrate with a MgSO4 content > 97% is selected for the magnesium sulfate;
a nano silicon dioxide: 15-25 parts, wherein the purity of the nano silicon dioxide is greater than 99.99%, and the moisture content of the nano silicon dioxide is < 0.01%;
a filler: 6-8 parts, wherein the filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminium oxide in a mass ratio of 2:1:1; the magnesium oxide is 85% light calcined magnesia (beige), wherein the content of active magnesium oxide is more than 65%, with a loss on ignition < 8;
a crosslinking agent: 5-7 parts, wherein the crosslinking agent is a polyvinyl alcohol liquid formed by dissolving polyvinyl alcohol with an average molecular weight between 110,000-130,000 and medium viscosity in hot water, and then formulating into a liquid with a solid content of 40%-60%;
a modifier: 0.4-0.6 parts, wherein the modifier is a mixture of trisodium phosphate and lithopone, and the mixing mass ratio of trisodium phosphate and lithopone is 1:3; and a stabilizer: 0.1-0.3 parts, wherein the stabilizer is sodium carboxymethylcellulose.
I The aforementioned adhesive is an inorganic adhesive free of organic substances.
I The method for preparing the aforementioned adhesive includes the following steps:
(1) mixing to dissolve magnesium chloride and magnesium sulfate in water according to a i 5 certain molar ratio, and obtaining a brine after stirring thoroughly (pale yellow and slightly j transparent);
(2) slowly adding an aqueous solution of sodium silicate in the aforementioned parts by
J mass dropwise into the brine prepared in the step (1) to obtain a slightly viscous sodium
J silicate-brine mixture, wherein the brine is in a stirring state during and after the dropwise , 0 adding process, the stirring speed is controlled at 120 r/min-140 r/min, and the stirring time is
I not less than 30 min;
I (3) adding a nano silicon dioxide in the parts by mass into the sodium silicate-brine mixture prepared in the step (2);
(4) adding a filler in the aforementioned parts by mass into the mixture obtained in the step (3), and uniformly stirring to obtain a semi-finished product; and (5) adding a crosslinking agent, a modifier and a stabilizer into the semi-finished product obtained in the step (4) to obtain a finished product of the adhesive.
The adhesive can be used as an inorganic adhesive in a vegetable fiberboard or artificial board.
In order to facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to preferred embodiments, but the claimed scope of the present invention is not limited to the following specific embodiments.
Example 1:
An adhesive of the present invention, is mainly prepared from the following components in 25 parts by mass:
an aqueous solution of sodium silicate: 50 g, wherein the modulus of the solute sodium silicate in the aqueous solution of sodium silicate is 2.8;
a brine: 10 g, wherein the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and 30 the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 8%, a magnesium chloride hexahydrate is selected for the magnesium chloride, and a magnesium sulfate heptahydrate with a MgSO4 content > 97% is selected for the magnesium sulfate;
a nano silicon dioxide: 15 g, wherein the purity of the nano silicon dioxide is greater than 99.99%, and the moisture content of the nano silicon dioxide is < 0.01%;
a filler: 6 g, wherein the filler is a mixture formed by mixing copper oxide, magnesium I oxide and aluminium oxide in a mass ratio of 3:1:1; the magnesium oxide is 85% light calcined
I magnesia (beige), wherein the content of active magnesium oxide is more than 65%, with a loss on ignition < 8;
i 5 a crosslinking agent: 5 g, wherein the crosslinking agent is a polyvinyl alcohol liquid j formed by dissolving polyvinyl alcohol with an average molecular weight of 110,000 and medium viscosity in hot water, and then formulating into a liquid with a solid content of 60%;
J a modifier: 0.4 g, wherein the modifier is a mixture of trisodium phosphate and lithopone,
J and the mixing mass ratio of trisodium phosphate and lithopone is 1:3; and ( 0 a stabilizer: 0.1 g, wherein the stabilizer is sodium carboxymethylcellulose.
I The aforementioned adhesive of this example is an inorganic adhesive free of organic
I substances.
The method for preparing the aforementioned adhesive of this example includes the following steps:
(1) adding 9.2 g of water into a 500 ml container, then sequentially adding 0.6 g of magnesium chloride and 0.2 g of magnesium sulfate, and stirring at a constant speed for 20 min to fully dissolve the two, so as to obtain a pale yellow and slightly transparent specially-made brine;
(2) slowly adding 50 g of an aqueous solution of sodium silicate dropwise into the brine 0 prepared in the step (1) to obtain a slightly viscous sodium silicate-brine mixture, wherein the brine is in a stirring state during and after the dropwise adding process, the stirring speed is controlled at 120 r/min-140 r/min, and the stirring time is 30 min;
(3) adding 20 g of a nano silicon dioxide into the sodium silicate-brine mixture prepared in the step (2), and stirring uniformly;
(4) adding 5 g of a filler into the mixture obtained in the step (3), and uniformly stirring to obtain a semi-finished product, wherein the filler is formed by uniformly mixing 3 g of copper oxide, 1 g of magnesium oxide and 1 g of aluminium oxide; and (5) adding 5 g of the crosslinking agent polyvinyl alcohol (with a solid content of 60%), 0.4 g of a modifier (trisodium phosphate and lithopone) and 0.1 g of the stabilizer sodium 30 carboxymethylcellulose into the semi-finished product obtained in the step (4) to obtain a finished product of the adhesive.
The adhesive can be used as an inorganic adhesive in a vegetable fiberboard or artificial board. The fiber board pressed by using the adhesive has a static bending strength reaching 27.12 MPa, an internal bonding strength of 0.75 MPa, and a bonding strength of plywood
2020100659 29 Apr 2020 reaching 0.90 MPa, which is flat the average strength of the board pressed by using the existing isocyanate adhesives, aldehyde adhesives and the like. However, the 24-hour thickness swelling rate of water absorption of the board pressed by using the adhesive of the present invention is only 70% of that of the product made by the existing adhesive. Moreover, the adhesive product 5 of the present invention can be realized, which has no combustion and no fuming under an open flame at 800°C, takes inorganic materials as main substances, and has weatherability that is obviously superior to that of the product made by the existing adhesive.
Example 2:
An adhesive of the present invention, is mainly prepared from the following components in 0 parts by mass:
an aqueous solution of sodium silicate: 55 g, wherein the modulus of the solute sodium silicate in the aqueous solution of sodium silicate is 3.0;
a brine: 15 g, wherein the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and 5 the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 8%, a magnesium chloride hexahydrate is selected for the magnesium chloride, and a magnesium sulfate heptahydrate with a MgSO4 content > 97% is selected for the magnesium sulfate;
a nano silicon dioxide: 20 g, wherein the purity of the nano silicon dioxide is greater than 99.99%, and the moisture content of the nano silicon dioxide is < 0.01%;
a filler: 7 g, wherein the filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminium oxide in a mass ratio of 2:1:1; the magnesium oxide is 85% light calcined magnesia (beige), wherein the content of active magnesium oxide is more than 65%, with a loss on ignition < 8;
a crosslinking agent: 7 g, wherein the crosslinking agent is a polyvinyl alcohol liquid 25 formed by dissolving polyvinyl alcohol with an average molecular weight of 120,000 and medium viscosity in hot water, and then formulating into a liquid with a solid content of 50%;
a modifier: 0.5 g, wherein the modifier is a mixture of trisodium phosphate and lithopone, and the mixing mass ratio of trisodium phosphate and lithopone is 1:3; and a stabilizer: 0.2 g, wherein the stabilizer is sodium carboxymethylcellulose.
The aforementioned adhesive of this example is an inorganic adhesive free of organic substances.
The method for preparing the aforementioned adhesive of this example includes the following steps:
(1) adding 13.8 g of water into a 500 ml container, then sequentially adding 0.9 g of
2020100659 29 Apr 2020 magnesium chloride and 0.3 g of magnesium sulfate, and stirring at a constant speed for 20 min to fully dissolve the two, so as to obtain a pale yellow and slightly transparent specially-made brine;
(2) slowly adding 55 g of an aqueous solution of sodium silicate dropwise into the brine 5 prepared in the step (1) to obtain a slightly viscous sodium silicate-brine mixture, wherein the brine is in a stirring state during and after the dropwise adding process, the stirring speed is controlled at 120 r/min-140 r/min, and the stirring time is 30 min;
(3) adding 25 g of a nano silicon dioxide into the sodium silicate-brine mixture prepared in the step (2), and stirring uniformly;
(4) adding 7 g of a filler into the mixture obtained in the step (3), and uniformly stirring to obtain a semi-finished product, wherein the filler is formed by uniformly mixing 3.5 g of copper oxide, 1.75 g of magnesium oxide and 1.75 g of aluminium oxide; and (5) adding 7 g of the crosslinking agent polyvinyl alcohol (with a solid content of 50%), 0.5 g of a modifier (trisodium phosphate and lithopone) and 0.2 g of the stabilizer sodium 5 carboxymethylcellulose into the semi-finished product obtained in the step (4) to obtain a finished product of the adhesive.
The adhesive can be used as an inorganic adhesive in a vegetable fiberboard or artificial board. The fiber board pressed by using the adhesive has a static bending strength reaching 27.02 MPa, an internal bonding strength of 0.75 MPa, and a bonding strength of plywood 0 reaching 0.90 MPa, which is flat the average strength of the board pressed by using the existing isocyanate adhesives, aldehyde adhesives and the like. However, the 24-hour thickness swelling rate of water absorption of the board pressed by using the adhesive of the present invention is only 75% of that of the product made by the existing adhesive. Moreover, the adhesive product of the present invention can be realized, which has no combustion and no fuming under an open 25 flame at 800°C, takes inorganic materials as main substances, and has weatherability that is obviously superior to that of the product made by the existing adhesive.
Example 3:
An adhesive of the present invention, is mainly prepared from the following components in parts by mass:
an aqueous solution of sodium silicate: 60 g, wherein the modulus of the solute sodium silicate in the aqueous solution of sodium silicate is 3.2;
a brine: 20 g, wherein the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium sulfate in the brine is 3:1, and the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 8%, a magnesium chloride hexahydrate is selected for the magnesium chloride, and a magnesium I sulfate heptahydrate with a MgS04 content > 97% is selected for the magnesium sulfate;
I a nano silicon dioxide: 25 g, wherein the purity of the nano silicon dioxide is greater than
99.99%, and the moisture content of the nano silicon dioxide is < 0.01%;
1 5 a filler: 8 g, wherein the filler is a mixture formed by mixing copper oxide, magnesium
I oxide and aluminium oxide in a mass ratio of 2:1:1; the magnesium oxide is 85% light calcined magnesia (beige), wherein the content of active magnesium oxide is more than 65%, with a loss [ on ignition < 8;
>
> a crosslinking agent: 6 g, wherein the crosslinking agent is a polyvinyl alcohol liquid i 0 formed by dissolving polyvinyl alcohol with an average molecular weight of 130,000 and | medium viscosity in hot water, and then formulating into a liquid with a solid content of 40%;
I a modifier: 0.6 g, wherein the modifier is a mixture of trisodium phosphate and lithopone, and the mixing mass ratio of trisodium phosphate and lithopone is 1:3; and a stabilizer: 0.3 g, wherein the stabilizer is sodium carboxymethylcellulose.
The aforementioned adhesive of this example is an inorganic adhesive free of organic substances.
The method for preparing the aforementioned adhesive of this example includes the following steps:
(1) adding 18.4 g of water into a 500 ml container, then sequentially adding 1.2 g of 0 magnesium chloride and 0.4 g of magnesium sulfate, and stirring at a constant speed for 20 min to fully dissolve the two, so as to obtain a pale yellow and slightly transparent specially-made brine;
(2) slowly adding 60 g of an aqueous solution of sodium silicate dropwise into the brine prepared in the step (1) to obtain a slightly viscous sodium silicate-brine mixture, wherein the brine is in a stirring state during and after the dropwise adding process, the stirring speed is controlled at 120 r/min-140 r/min, and the stirring time is 30 min;
(3) adding 30 g of a nano silicon dioxide into the sodium silicate-brine mixture prepared in the step (2), and stirring uniformly;
(4) adding 8 g of a filler into the mixture obtained in the step (3), and uniformly stirring to obtain a semi-finished product, wherein the filler is formed by uniformly mixing 4.0 g of copper oxide, 2.0 g of magnesium oxide and 2.0 g of aluminium oxide; and (5) adding 7 g of the crosslinking agent polyvinyl alcohol (with a solid content of 40%), 0.6 g of a modifier (trisodium phosphate and lithopone) and 0.3 g of the stabilizer sodium carboxymethylcellulose into the semi-finished product obtained in the step (4) to obtain a io finished product of the adhesive.
The adhesive can be used as an inorganic adhesive in a vegetable fiberboard or artificial board. The fiber board pressed by using the adhesive has a static bending strength reaching 27.00 MPa, an internal bonding strength of 0.76 MPa, and a bonding strength of plywood 5 reaching 0.91 MPa, which is flat the average strength of the board pressed by using the existing isocyanate adhesives, aldehyde adhesives and the like. However, the 24-hour thickness swelling rate of water absorption of the board pressed by using the adhesive of the present invention is only 68% of that of the product made by the existing adhesive. Moreover, the adhesive product of the present invention can be realized, which has no combustion and no fuming under an open 0 flame at 800°C, takes inorganic materials as main substances, and has weatherability that is obviously superior to that of the product made by the existing adhesive.

Claims (5)

    Claims 2020100659 29 Apr 2020 WHAT IS CLAIMED IS:
  1. (1) mixing to dissolve magnesium chloride and magnesium sulfate in water according to a certain molar ratio, and obtaining a brine after stirring thoroughly;
    1. An adhesive, which is mainly prepared from the following components in parts by mass:
    an aqueous solution of sodium silicate: 50-60 parts;
    a brine: 10-20 parts;
    a nano silicon dioxide: 15-25 parts;
    a filler: 6-8 parts;
    a crosslinking agent: 5-7 parts;
    a modifier: 0.4-0.6 parts; and a stabilizer: 0.1-0.3 parts.
  2. (2) adding an aqueous solution of sodium silicate in the parts by mass into the brine
    2020100659 29 Apr 2020 prepared in the step (1) to obtain a sodium silicate-brine mixture;
    2. The adhesive according to claim 1, wherein the modulus of the solute sodium silicate in the aqueous solution of sodium silicate is 2.8-3.2;
    wherein the brine is a mixed solution of magnesium chloride and magnesium sulfate, and the mass ratio of magnesium chloride and magnesium sulfate in the brine is 2.5-3.5:1, and the total mass concentration of magnesium chloride and magnesium sulfate in the brine is 7%-9%;
    wherein the filler is a mixture formed by mixing copper oxide, magnesium oxide and aluminum oxide in a mass ratio of 2-4:1:1;
    wherein the crosslinking agent is a polyvinyl alcohol liquid formed by firstly dissolving polyvinyl alcohol with an average molecular weight of 110,000-130,000 and medium viscosity in hot water, and then formulating into a liquid with a solid content of 40%-60%;
    wherein the modifier is a mixture of trisodium phosphate and lithopone, with the mixing mass ratio of trisodium phosphate and lithopone being 1:4-2, and the stabilizer is sodium carboxymethylcellulose;
    wherein the adhesive is an inorganic adhesive free of organic substances.
  3. (3) adding a nano silicon dioxide in the parts by mass into the sodium silicate-brine mixture prepared in the step (2);
    3. A method for preparing the adhesive according to claim 1, comprising the following steps:
  4. 4. The preparation method according to claim 7, wherein in the step (2), the aqueous solution of sodium silicate is slowly added dropwise into the brine prepared in the step (1), and the brine is in a stirring state during and after the dropwise adding process, the stirring speed is controlled at 120 r/min-140 r/min, and the stirring time is not less than 30 min, preferably, wherein in the step (4) the filler comprises copper oxide, magnesium oxide and aluminum oxide, and the particle size of the filler is less than 200 meshes; the magnesium oxide is 85% light calcined magnesia, wherein the content of active magnesium oxide is more than 65%, with a loss on ignition < 8.
    (4) adding a filler in the parts by mass into the mixture obtained in the step (3), and uniformly stirring to obtain a semi-finished product; and (5) adding a crosslinking agent, a modifier and a stabilizer into the semi-finished product obtained in the step (4) to obtain a finished product of the adhesive.
  5. 5. Use of the adhesive according to claim 1 as an inorganic adhesive in a vegetable fiberboard or artificial board.
AU2020100659A 2020-04-29 2020-04-29 Adhesive, preparation method thereof, and use of the same in vegetable fiberboard or artificial board Ceased AU2020100659A4 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114045125A (en) * 2021-11-25 2022-02-15 广西畔森装饰材料有限公司 Adhesive for plywood production
CN115772383A (en) * 2022-12-09 2023-03-10 上海昶法新材料有限公司 Lignin formaldehyde-free glue and preparation method thereof
CN116143490A (en) * 2022-12-27 2023-05-23 江苏佳饰家新材料集团股份有限公司 Inorganic biomass material non-combustible plate and preparation method thereof
CN116574452A (en) * 2023-06-20 2023-08-11 中国林业科学研究院木材工业研究所 Waterproof magnesium oxychloride inorganic adhesive for plywood and preparation method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114045125A (en) * 2021-11-25 2022-02-15 广西畔森装饰材料有限公司 Adhesive for plywood production
CN115772383A (en) * 2022-12-09 2023-03-10 上海昶法新材料有限公司 Lignin formaldehyde-free glue and preparation method thereof
CN116143490A (en) * 2022-12-27 2023-05-23 江苏佳饰家新材料集团股份有限公司 Inorganic biomass material non-combustible plate and preparation method thereof
CN116143490B (en) * 2022-12-27 2024-01-26 江苏佳饰家新材料集团股份有限公司 Inorganic biomass material non-combustible plate and preparation method thereof
CN116574452A (en) * 2023-06-20 2023-08-11 中国林业科学研究院木材工业研究所 Waterproof magnesium oxychloride inorganic adhesive for plywood and preparation method thereof
CN116574452B (en) * 2023-06-20 2024-01-23 中国林业科学研究院木材工业研究所 Waterproof magnesium oxychloride inorganic adhesive for plywood and preparation method thereof

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