CN110373114B - Double-crosslinking high-performance water glass wood adhesive and preparation method thereof - Google Patents
Double-crosslinking high-performance water glass wood adhesive and preparation method thereof Download PDFInfo
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- CN110373114B CN110373114B CN201910652383.3A CN201910652383A CN110373114B CN 110373114 B CN110373114 B CN 110373114B CN 201910652383 A CN201910652383 A CN 201910652383A CN 110373114 B CN110373114 B CN 110373114B
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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
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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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- Chemical & Material Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a double-crosslinking high-performance water glass wood adhesive which comprises the following raw materials in parts by weight: 60-80 parts of water glass; 18-24 parts of a sodium methylsilicate aqueous solution; 3-12 parts of modified polyaspartic acid ester resin; 0.5-2.5 parts of amino-terminated hyperbranched polyamide-amine; 2-6 parts of hexamethylene diisocyanate trimer; 0.03-0.06 part of aluminum nitrate; 2-8 parts of talcum powder; the invention also discloses a preparation method of the double-crosslinking high-performance water glass wood adhesive. The invention has the advantages of simple process, stable performance, high bonding strength, water resistance, high and low temperature change resistance, ready use and convenient use.
Description
Technical Field
The invention relates to the field of wood adhesives, in particular to a double-crosslinking high-performance water glass wood adhesive and a preparation method thereof.
Background
The adhesives commonly used in the wood processing industry are mainly urea-formaldehyde resin, phenol-formaldehyde resin and melamine-formaldehyde resin (namely, 'trialdehyde glue'), and the organic synthetic resin adhesives have the characteristics of high bonding strength, high curing speed, good water resistance and the like, and meet most requirements of wood product production. However, the organic synthetic adhesives release formaldehyde toxic compounds in the production and use processes, thereby not only polluting the environment, but also being harmful to human health. With the increasing perfection of environmental regulations and the continuous enhancement of environmental awareness of people, the application of the formaldehyde-free adhesive is greatly limited, and the development of the environment-friendly high-performance adhesive which can really replace the formaldehyde-free adhesive is an important demand of the wood processing industry, so that the environment-friendly high-performance adhesive has important practical significance.
The water glass adhesive is a common inorganic adhesive, has the advantages of low cost, simple and convenient preparation process, outstanding high-temperature resistance, environmental protection, no toxicity and the like, has extremely high adhesive property to metal, glass, ceramics, castings, sandy soil and the like, and has great advantages and good development prospect when being popularized and applied to the field of wood adhesives. However, the water glass molecules are rigid, and the formed glue layer has the defects of high brittleness and poor water resistance, and when the water glass is applied to bonding of wood products, the water glass needs to be toughened and subjected to water-resistant modification. At present, a plurality of researches report that water glass can be used for bonding wooden products after being modified, but the main problems exist are that the modification process of the water glass wood adhesive is too complex, the performance is not stable enough, and the practicability is not strong.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-crosslinking high-performance water glass wood adhesive and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the double-crosslinking high-performance water glass wood adhesive comprises the following raw materials in parts by weight:
60-80 parts of water glass;
18-24 parts of a sodium methylsilicate aqueous solution;
3-12 parts of modified polyaspartic acid ester resin;
0.5-2.5 parts of amino-terminated hyperbranched polyamide-amine;
2-6 parts of hexamethylene diisocyanate trimer;
0.03-0.06 part of aluminum nitrate;
2-8 parts of talcum powder.
The further technical scheme of the invention is as follows: the mass fraction of the sodium methyl silicate contained in the sodium methyl silicate aqueous solution is 5-10%, and the mass fraction is preferably 7.5%.
Further, the particle size of the talcum powder is 800-3000 meshes.
The preparation method of the double-crosslinking high-performance water glass wood adhesive adopts the raw materials in parts by weight, and specifically comprises the following operation steps:
1) putting 60-80 parts of water glass into a stirring tank, adding 3-12 parts of modified polyaspartic acid ester resin and 0.5-2.5 parts of amino-terminated hyperbranched polyamide-amine, and stirring at high speed for 20-60min to obtain a component A;
2) dispersing 0.03-0.06 part of aluminum nitrate into 18-24 parts of a 7.5 mass percent aqueous solution of sodium methylsilicate, then sequentially adding 2-8 parts of talcum powder and 2-6 parts of hexamethylene diisocyanate trimer, and uniformly stirring at a high speed to obtain a component B;
3) when in use, the component A and the component B are uniformly mixed to obtain the double-crosslinking high-performance water glass wood adhesive.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, a high-performance water glass-based adhesive is prepared by utilizing dehydration crosslinking reaction between silanol groups of water glass and sodium methyl silicate and crosslinking reaction of amine and isocyanate groups between polyaspartic acid ester, amino-terminated hyperbranched polyamide-amine and hexamethylene diisocyanate trimer, and the double crosslinking reaction enables molecules of all components of the adhesive to be interwoven and communicated, so that performance complementation is realized, the adhesive with high bonding strength and excellent water resistance is obtained, and a double-component formula is adopted to ensure the storage stability and the convenience in use of the adhesive;
2. the main components of the adhesive, such as water glass, sodium methyl silicate, polyaspartic acid ester resin, superfine talcum powder and the like, are rich in sources and excellent in performance, so that the strong water resistance and low-price formaldehyde-free property of the adhesive are ensured;
3. the double-crosslinking high-performance water glass wood adhesive prepared by the invention can be used for bonding different wood species and wood raw materials (wood chips, wood fibers, wood veneers, bamboo fibers, bamboo powder, bamboo chips, non-wood crop straws and the like), can replace commonly used formaldehyde glue, milk white glue, isocyanate glue and the like, has simple and convenient preparation process, and is suitable for industrial popularization and production application;
4. the invention has the advantages of simple process, stable performance, high bonding strength, water resistance, high and low temperature change resistance, ready use and convenient use.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
Example 1:
putting 60 parts of water glass into a stirring tank, adding 3 parts of modified polyaspartic acid ester resin and 0.5 part of amino-terminated hyperbranched polyamide-amine, and stirring at high speed for 30min to obtain a component A; then, 0.03 part of aluminum nitrate is dispersed into 18 parts of a sodium methylsilicate aqueous solution with the mass fraction of 7.5%, then 2 parts of 800-mesh talcum powder and 2 parts of hexamethylene diisocyanate trimer are sequentially added, and the mixture is stirred at a high speed and mixed uniformly to obtain a component B; and uniformly mixing the component A and the component B to obtain a finished product.
The birch fiber is used as a raw material, the water content is controlled within 15 percent, the double-crosslinking sodium silicate adhesive prepared in the embodiment accounting for 20 to 40 percent of the total weight of the material is added, the mixture is uniformly mixed and filled into a mold for paving, the mixture is pressed and formed by a flat press at room temperature, the mold is locked for 1 to 2 hours, and the prepared birch fiber is prepared into the double-crosslinking sodium silicate adhesive with the density of 0.9g/cm3The birch fiberboard. The formaldehyde emission is not detected according to the test of GB18580-2001, Formaldehyde emission limit in artificial boards and products of interior decoration materials. The static bending strength, the elastic modulus and the water absorption thickness expansion rate are tested according to GB/T17657-1999 test method for physical and chemical properties of artificial boards and veneers, and the values are 21.36MPa, 5484MPa and 3.71 percent respectively. After the birch fiberboard is stored for 6 months under the natural ventilation condition at room temperature, the prepared birch fiberboard still can be well stored, and the adverse phenomena of warping, deformation, mildew and the like do not occur.
Example 2:
putting 70 parts of water glass into a stirring tank, adding 7 parts of modified polyaspartic acid ester resin and 1 part of amino-terminated hyperbranched polyamide-amine, and stirring at a high speed for 30min to obtain a component A; then, 0.05 part of aluminum nitrate is dispersed into 20 parts of a sodium methylsilicate aqueous solution with the mass fraction of 7.5%, then 5 parts of 1000-mesh talcum powder and 4 parts of hexamethylene diisocyanate trimer are sequentially added, and the mixture is stirred and mixed uniformly at a high speed to obtain a component B; and uniformly mixing the component A and the component B to obtain a finished product.
Using poplar fiber as raw material, controlling water content within 15%, adding 20-40 wt% of the total material, filling into a mould for paving, pressing and molding at room temperature by using a flat press, and locking the mould for 1-2h to obtain the product with density of 0.9g/cm3Poplar fiberboard. The formaldehyde emission is not detected according to the test of GB18580-2001, Formaldehyde emission limit in artificial boards and products of interior decoration materials. The static bending strength, the elastic modulus and the water absorption thickness expansion rate are tested according to GB/T17657-1999 test method for physical and chemical properties of artificial boards and veneers, and the values are respectively 19.59MPa, 4986MPa and 4.04 percent. After the poplar fiber boards are stored for 6 months under the natural ventilation condition at room temperature, the prepared poplar fiber boards are still well stored, and the adverse phenomena of warping, deformation, mildewing and the like do not occur.
Example 3:
putting 80 parts of water glass into a stirring tank, adding 12 parts of modified polyaspartic acid ester resin and 2.5 parts of amino-terminated hyperbranched polyamide-amine, and stirring at high speed for 30min to obtain a component A; then, 0.06 part of aluminum nitrate is dispersed into 24 parts of a sodium methylsilicate aqueous solution with the mass fraction of 7.5%, then 8 parts of 2000-mesh talcum powder and 6 parts of hexamethylene diisocyanate trimer are sequentially added, and the mixture is stirred and mixed uniformly at a high speed to obtain a component B; and uniformly mixing the component A and the component B to obtain a finished product.
The zelkova fiber is used as a raw material, the water content is controlled within 15 percent, the double-crosslinking sodium silicate adhesive prepared in the embodiment accounting for 20 to 40 percent of the total weight of the material is added, the mixture is uniformly mixed and filled into a mold for paving, the mixture is pressed and formed by a flat press at room temperature, the mold is locked for 1 to 2 hours, and the prepared material has the density of 0.9g/cm3Beech wood fiber board. The formaldehyde emission is not detected according to the test of GB18580-2001, Formaldehyde emission limit in artificial boards and products of interior decoration materials. The static bending strength, the elastic modulus and the water absorption thickness expansion rate are tested according to GB/T17657-1999 test method for physical and chemical properties of artificial boards and veneers20.76MPa, 5192MPa and 3.88 percent respectively. After the beech wood fiber board is stored for 6 months under the natural ventilation condition at room temperature, the prepared beech wood fiber board still can be well stored, and the adverse phenomena of warping, deformation, mildewing and the like do not occur.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (3)
1. The double-crosslinking high-performance water glass wood adhesive is characterized by comprising the following raw materials in parts by weight:
60-80 parts of water glass;
18-24 parts of a sodium methylsilicate aqueous solution;
3-12 parts of modified polyaspartic acid ester resin;
0.5-2.5 parts of amino-terminated hyperbranched polyamide-amine;
2-6 parts of hexamethylene diisocyanate trimer;
0.03-0.06 part of aluminum nitrate;
2-8 parts of talcum powder;
the mass fraction of the sodium methyl silicate contained in the sodium methyl silicate aqueous solution is 5-10%.
2. The double-crosslinking high-performance water glass wood adhesive as claimed in claim 1, wherein the particle size of the talcum powder is 800-3000 meshes.
3. The preparation method of the double-crosslinking high-performance water glass wood adhesive is characterized by adopting the raw materials in parts by weight according to claim 1 or 2, and specifically comprises the following operation steps:
1) putting 60-80 parts of water glass into a stirring tank, adding 3-12 parts of modified polyaspartic acid ester resin and 0.5-2.5 parts of amino-terminated hyperbranched polyamide-amine, and uniformly stirring at high speed to obtain a component A;
2) dispersing 0.03-0.06 part of aluminum nitrate into 18-24 parts of a 7.5 mass percent aqueous solution of sodium methylsilicate, then sequentially adding 2-8 parts of talcum powder and 2-6 parts of hexamethylene diisocyanate trimer, and uniformly stirring at a high speed to obtain a component B;
3) when in use, the component A and the component B are uniformly mixed to obtain the double-crosslinking high-performance water glass wood adhesive.
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| CN113637398B (en) * | 2021-08-25 | 2022-03-08 | 黄山中邦孚而道涂料有限公司 | Bottom-surface integrated solvent-free polyaspartic acid ester heavy-duty anticorrosive paint, and preparation method and application thereof |
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