CN112608699A - Environment-friendly adhesive for plywood and preparation method thereof - Google Patents
Environment-friendly adhesive for plywood and preparation method thereof Download PDFInfo
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- CN112608699A CN112608699A CN202011489576.0A CN202011489576A CN112608699A CN 112608699 A CN112608699 A CN 112608699A CN 202011489576 A CN202011489576 A CN 202011489576A CN 112608699 A CN112608699 A CN 112608699A
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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
- 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
-
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses an environment-friendly adhesive for plywood and a preparation method thereof, wherein the adhesive comprises the following raw materials in parts by weight: 80-120 parts of urea-formaldehyde resin, 30-50 parts of modified tapioca starch, 10-20 parts of montmorillonite powder, 5-10 parts of sodium carboxymethylcellulose, 3-8 parts of polyacrylamide, 5-15 parts of redispersible latex powder and 1-3 parts of silane coupling agent. The urea-formaldehyde resin and the modified tapioca starch are taken as main materials, and auxiliary materials such as montmorillonite powder and sodium carboxymethylcellulose are matched, so that the prepared adhesive is high in bonding strength and low in free formaldehyde content, is a nontoxic, pollution-free, safe and environment-friendly adhesive, lays a good foundation for producing environment-friendly ecological plywood, and has wide market application prospect.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to an environment-friendly adhesive for plywood and a preparation method thereof.
Background
Three major glue species are used in the traditional plywood processing industry: urea-formaldehyde resin, phenol-formaldehyde resin and melamine formaldehyde resin have the problem of aldehyde toxic compound release in the preparation, curing and using processes, and seriously pollute the environment and harm the human health. With the gradual enhancement of people's environmental awareness and the increasing perfection of national environmental regulations, the development of nontoxic, pollution-free, green and environment-friendly adhesive for plywood has become a necessary trend for industrial development.
The urea-formaldehyde resin has the lowest price in the synthetic resin due to sufficient raw materials and low price. The urea-formaldehyde resin has many advantages, such as high adhesive strength, quick curing, light color of the cured glue layer, no pollution to the board surface of the glued compound, good water solubility and easy preparation to proper viscosity and concentration. Although the urea-formaldehyde resin is widely used in the current plywood field, the urea-formaldehyde resin is gradually eliminated by the market due to serious environmental pollution and harm to human health. Therefore, the development of environment-friendly high-performance adhesives has become a research hotspot in the field of current plywood.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention provides an environment-friendly adhesive for plywood and a preparation method thereof, aiming at the defects of the current urea-formaldehyde resin. The urea-formaldehyde resin and the modified tapioca starch are taken as main materials, and auxiliary materials such as montmorillonite powder and sodium carboxymethylcellulose are matched, so that the prepared adhesive is high in bonding strength and low in free formaldehyde content, is a nontoxic, pollution-free, safe and environment-friendly adhesive, lays a good foundation for producing environment-friendly ecological plywood, and has wide market application prospect.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 80-120 parts of urea-formaldehyde resin, 30-50 parts of modified tapioca starch, 10-20 parts of montmorillonite powder, 5-10 parts of sodium carboxymethylcellulose, 3-8 parts of polyacrylamide, 5-15 parts of redispersible latex powder and 1-3 parts of silane coupling agent.
Preferably, the preparation method of the modified tapioca starch comprises the following steps: adding a modifier consisting of polyethylene glycol distearate and polyoxypropylene polyoxyethylene propylene glycol ether into the cassava starch for surface modification.
Preferably, the modifier is added in an amount of 1-2% by weight of the tapioca starch.
Preferably, the mass ratio of the polyethylene glycol distearate to the polyoxypropylene polyoxyethylene propylene glycol ether in the modifier is 1-3: 1.
Preferably, the silane coupling agent is one or more of KH550, KH560, KH570 and KBM 803.
Preferably, the redispersible latex powder is one or more of vinyl acetate and ethylene copolymer rubber powder, acrylate and styrene copolymer rubber powder and ethylene, vinyl chloride and vinyl monthly silicate ternary copolymer rubber powder.
The preparation method of the environment-friendly adhesive for the plywood comprises the following steps:
(1) montmorillonite powder, sodium carboxymethylcellulose and a silane coupling agent are added with water and stirred into a viscous mixture;
(2) and adding polyacrylamide, redispersible latex powder, modified starch and urea-formaldehyde resin into the viscous mixture, stirring and mixing uniformly, and packaging to obtain the environment-friendly adhesive.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the urea-formaldehyde resin and the modified tapioca starch are taken as main materials, and auxiliary materials such as montmorillonite powder and sodium carboxymethylcellulose are matched, so that the prepared adhesive is high in bonding strength and low in free formaldehyde content, is a nontoxic, pollution-free, safe and environment-friendly adhesive, lays a good foundation for producing environment-friendly ecological plywood, and has wide market application prospect.
2. The urea-formaldehyde resin is combined with renewable natural high polymer material starch with low price, the produced adhesive meets the requirement of environmental protection, and the cassava starch is modified by the polyethylene glycol distearate and the polyoxypropylene polyoxyethylene propylene glycol ether, so that the compatibility between the starch and other raw materials can be improved, the interface bonding force can be improved, and the stability and the adhesive strength of the starch can be improved.
3. According to the invention, montmorillonite powder is added into the adhesive, so that harmful gas released by urea-formaldehyde resin can be adsorbed, and the montmorillonite powder can improve the adhesive property of the adhesive; the addition of sodium carboxymethylcellulose can improve the compatibility between the montmorillonite powder and other organic raw materials and can also improve the bonding strength of the adhesive.
4. The polyacrylamide and the redispersible latex powder are added, so that the adhesiveness of the adhesive can be improved, and the waterproof and moisture-proof performances of the adhesive can be improved.
5. According to the invention, the silane coupling agent is added in the formula of the adhesive, so that the dispersibility and the adhesive force of the montmorillonite powder and the titanium dioxide inorganic filler in the urea-formaldehyde resin can be improved, the compatibility between the inorganic filler and the resin can be improved, the strength of the adhesive can be improved, and the waterproof, moistureproof, weather-resistant and aging-resistant performances of the adhesive can be improved.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
The preparation method of the modified tapioca starch used in the following examples is as follows: adding a modifier consisting of polyethylene glycol distearate and polyoxypropylene polyoxyethylene propylene glycol ether in a mass ratio of 2:1 into the cassava starch for surface modification, wherein the addition amount of the modifier is 1.8 percent of the mass of the cassava starch; the surface modification is stirring for 20min at the rotating speed of 500 r/min.
Example 1
The environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 110 parts of urea-formaldehyde resin, 30 parts of modified tapioca starch, 17 parts of montmorillonite powder, 8 parts of sodium carboxymethyl cellulose, 5 parts of polyacrylamide, 10 parts of vinyl acetate and ethylene copolymerized rubber powder and 2.5 parts of KH570 silane coupling agent.
Example 2
The environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 90 parts of urea-formaldehyde resin, 45 parts of modified tapioca starch, 13 parts of montmorillonite powder, 6 parts of sodium carboxymethyl cellulose, 6 parts of polyacrylamide, 8 parts of acrylate and styrene copolymerized rubber powder and 2.0 parts of KH560 silane coupling agent.
Example 3
The environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 100 parts of urea-formaldehyde resin, 40 parts of modified tapioca starch, 15 parts of montmorillonite powder, 7 parts of sodium carboxymethyl cellulose, 4 parts of polyacrylamide, 12 parts of ethylene-vinyl chloride-vinyl laurate ternary copolymer rubber powder and 1.8 parts of KH550 silane coupling agent.
Example 4
The environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 95 parts of urea-formaldehyde resin, 35 parts of modified tapioca starch, 10 parts of montmorillonite powder, 10 parts of sodium carboxymethylcellulose, 7 parts of polyacrylamide, 10 parts of ethylene-vinyl chloride-vinyl laurate ternary copolymer powder and 1.5 parts of KH560 silane coupling agent.
Example 5
The environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 120 parts of urea-formaldehyde resin, 40 parts of modified tapioca starch, 15 parts of montmorillonite powder, 8 parts of sodium carboxymethyl cellulose, 5 parts of polyacrylamide, 8 parts of acrylate and styrene copolymerized rubber powder and 1.2 parts of KH560 silane coupling agent.
Example 6
The environment-friendly adhesive for the plywood comprises the following raw materials in parts by weight: 100 parts of urea-formaldehyde resin, 42 parts of modified tapioca starch, 13 parts of montmorillonite powder, 7 parts of sodium carboxymethyl cellulose, 6 parts of polyacrylamide, 12 parts of vinyl acetate and ethylene copolymerized rubber powder and 2.0 parts of KBM803 silane coupling agent.
Comparative example 1
This example differs from example 1 in that: the cassava starch is not subjected to modification treatment.
Comparative example 2
This example differs from example 1 in that: montmorillonite powder was not added.
Comparative example 3
This example differs from example 1 in that: sodium carboxymethylcellulose was not added.
Comparative example 4
This example differs from example 1 in that: no polyacrylamide and vinyl acetate and ethylene copolymer powder are added.
Comparative example 5
This example differs from example 1 in that: no silane coupling agent was added.
Manufacturing a test piece according to the GB/T9846.7-2004 standard, preparing a test piece veneer by using a fast-growing eucalyptus plate, and pressing the plate according to the process parameters: the test piece specification is 300mm multiplied by 9mm, the adhesives of the examples 1-5 and the comparative example are uniformly coated on the fast-growing eucalyptus single boards by adopting a manual brush coating mode, the 5 layers of plywood are assembled by using a conventional vertical texture mode, the adhesive application amount is 350-2The cold press molding process is adopted, the pressure is 1.0-1.5MPa, and the plate is unloaded after the pressure is maintained for 12 hours at room temperature. The adhesive strength, water resistance and formaldehyde emission of the adhesive were measured according to conventional methods, and the test results are shown in table 1.
Wherein, the gluing strength refers to GB 9846-2004; the waterproof performance test is carried out on the 24h water absorption rate and the water-resistant time of the plywood according to the national standard GB/T9846-2004, wherein in the water-resistant time test, a test piece is immersed in warm water at the temperature of (60 +/-3) DEG C, and the time required by the test piece from the immersion in the water to the cracking of a glue layer is recorded; the formaldehyde emission was found in WB/T18580-2001.
Table 1: performance test result of plywood prepared by applying adhesive disclosed by the invention
| Product(s) | Bonding Strength (MPa) | Water-resistant time (d) | Formaldehyde emission (mg/L) |
| Example 1 | 1.36 | 31 | 0.023 |
| Example 2 | 1.28 | 27 | 0.031 |
| Example 3 | 1.31 | 29 | 0.026 |
| Example 4 | 1.23 | 25 | 0.034 |
| Example 5 | 1.19 | 28 | 0.029 |
| Example 6 | 1.30 | 27 | 0.026 |
| Comparative example 1 | 1.13 | 28 | 0.059 |
| Comparative example 2 | 1.29 | 26 | 0.38 |
| Comparative example 3 | 1.07 | 24 | 0.035 |
| Comparative example 4 | 1.23 | 13 | 0.054 |
| Comparative example 5 | 1.09 | 20 | 0.042 |
From the test results, the adhesive prepared by the invention has high bonding strength and low free formaldehyde content, is a nontoxic, pollution-free, safe and environment-friendly adhesive, lays a good foundation for producing environment-friendly ecological plywood, and has wide market application prospect.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (7)
1. The utility model provides an environmental protection gluing agent for plywood which characterized in that: the composite material comprises the following raw materials in parts by weight: 80-120 parts of urea-formaldehyde resin, 30-50 parts of modified tapioca starch, 10-20 parts of montmorillonite powder, 5-10 parts of sodium carboxymethylcellulose, 3-8 parts of polyacrylamide, 5-15 parts of redispersible latex powder and 1-3 parts of silane coupling agent.
2. The environment-friendly adhesive for the plywood as claimed in claim 1, wherein: the preparation method of the modified cassava starch comprises the following steps: adding a modifier consisting of polyethylene glycol distearate and polyoxypropylene polyoxyethylene propylene glycol ether into the cassava starch for surface modification.
3. The environment-friendly adhesive for the plywood as claimed in claim 2, wherein: the addition amount of the modifier is 1-2% of the weight of the cassava starch.
4. The environment-friendly adhesive for the plywood as claimed in claim 3, wherein: the mass ratio of the polyethylene glycol distearate to the polyoxypropylene polyoxyethylene propylene glycol ether in the modifier is 1-3: 1.
5. The environment-friendly adhesive for the plywood as claimed in claim 1, wherein: the silane coupling agent is one or a combination of KH550, KH560, KH570 and KBM 803.
6. The environment-friendly adhesive for the plywood as claimed in claim 1, wherein: the redispersible latex powder is one or more of vinyl acetate and ethylene copolymer rubber powder, acrylate and styrene copolymer rubber powder and ethylene, vinyl chloride and vinyl monthly silicate ternary copolymer rubber powder.
7. The method for preparing the environment-friendly adhesive for plywood as claimed in claims 1 to 6, wherein the method comprises the following steps: the method comprises the following steps:
(1) montmorillonite powder, sodium carboxymethylcellulose and a silane coupling agent are added with water and stirred into a viscous mixture;
(2) and adding polyacrylamide, redispersible latex powder, modified starch and urea-formaldehyde resin into the viscous mixture, stirring and mixing uniformly, and packaging to obtain the environment-friendly adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011489576.0A CN112608699A (en) | 2020-12-16 | 2020-12-16 | Environment-friendly adhesive for plywood and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011489576.0A CN112608699A (en) | 2020-12-16 | 2020-12-16 | Environment-friendly adhesive for plywood and preparation method thereof |
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| CN112608699A true CN112608699A (en) | 2021-04-06 |
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| CN202011489576.0A Pending CN112608699A (en) | 2020-12-16 | 2020-12-16 | Environment-friendly adhesive for plywood and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003640A (en) * | 2022-12-16 | 2023-04-25 | 山东光大赛路新材料科技有限公司 | Preparation method and application of novel composite modified starch ether |
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Cited By (2)
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Application publication date: 20210406 |