CN111484819A

CN111484819A - Environment-friendly water-based adhesive and preparation method and application thereof

Info

Publication number: CN111484819A
Application number: CN202010353585.0A
Authority: CN
Inventors: 凌万青
Original assignee: Shanghai Lujia Adhesive Co ltd
Current assignee: Shanghai Lujia Adhesive Co ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-04

Abstract

The invention relates to the technical field of adhesives, in particular to an environment-friendly water-based adhesive and a preparation method thereof. The environment-friendly water-based adhesive at least comprises the following components in percentage by weight: 60-90% of high polymer emulsion, 2-12% of filler, 1-3% of plasticizer, 0.2-1.5% of defoaming agent, 0.1-5% of surfactant, 0.5-3% of thickening agent and water for supplementing 100%. The invention provides an environment-friendly water-based adhesive which is mainly applied to gluing of metal foil and wood board composite and has the advantages of low cost, soft adhesive layer, good high-temperature stability, good water resistance, environment friendliness, easiness in construction and the like. Meanwhile, the problem of poor affinity and adhesion between common white latex and metal foil is solved, and the white latex is easy to transport, store, use and clean.

Description

Environment-friendly water-based adhesive and preparation method and application thereof

Technical Field

The invention relates to the technical field of adhesives, in particular to an environment-friendly water-based adhesive and a preparation method and application thereof.

Background

With the continuous updating and development of manufacturing materials and processes of furniture and wood products, Medium Density Fiber (MDF), Particle Board (PB) and plywood (plywood) are increasingly used in furniture and wood doors, and before the furniture and the wood doors are used, secondary processing such as veneering and compounding is needed in furniture factories and wood door factories, so that the grade of products such as furniture and wood doors is improved, and the products are more attractive and durable. Traditionally, wood veneer, PVC film, paper and the like are generally used as veneering materials, and the materials are generally not high temperature resistant, have poor wear resistance and corrosion resistance, and are not suitable for high-end and special application occasions.

Therefore, on the basis of artificial boards (MDF, PB and the like), high-grade door plates and furniture for pasting metal foils appear, and the furniture and the wooden doors are made of the artificial boards, so that the manufacturing cost is low, the feeling similar to metal is brought to people, the grade is high, the high temperature resistance is high, and the corrosion resistance is good. Also, the application of veneers on aluminum panels makes metal panels look a little natural wood product. When the common water-based adhesive is used for adhering metal surfaces, the effect is poor, so solvent adhesive is often adopted for the composite adhesion of the metal aluminum foil and the wood plate, but the solvent adhesive is not suitable for the large-area gluing process of the door plate, contains organic volatile matters and substances with heavy metal odor and is not environment-friendly.

In order to solve the problems, the invention mainly solves the problems in the use of glue in the compounding of the metal aluminum foil and the wooden board, and provides the water-based glue with the advantages of good high-temperature performance and water resistance, soft glue layer, environmental protection, easy operation and construction and the like.

Disclosure of Invention

In order to solve the technical problems, the first aspect of the invention provides an environment-friendly water-based adhesive, which at least comprises the following components in percentage by weight: 60-90% of high polymer emulsion, 2-12% of filler, 1-3% of plasticizer, 0.2-1.5% of defoaming agent, 0.5-3% of thickening agent, 0.1-5% of surfactant and the balance of water to 100%.

As a preferred technical solution of the present invention, the polymer emulsion is at least one selected from polyisoprene copolymer emulsion, polyacrylate emulsion, polyurethane emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, acrylic emulsion, maleimide emulsion and styrene-butadiene latex.

As a preferable technical scheme of the invention, the solid content of the vinyl acetate-ethylene copolymer emulsion is not less than 50 wt%.

As a preferable technical scheme of the invention, the dynamic viscosity of the vinyl acetate-ethylene copolymer emulsion at 25 ℃ is 2000-4000 cps.

As a preferable technical scheme of the invention, the filler is selected from at least one of silicon dioxide, diatomite, attapulgite, mica powder, titanium dioxide, boron powder, silicon carbide, boron nitride and zirconium boride.

As a preferable technical scheme of the invention, the weight ratio of the filler to the polymer emulsion is 1: (6-12).

In a preferred embodiment of the present invention, the isocyanate is a mixture of high-functionality isocyanate and diphenylmethane diisocyanate; the isocyanate has a functionality of 2.5 to 3.

As a preferred embodiment of the present invention, the isocyanate has a kinetic viscosity of 150-250cps at 25 ℃.

The second aspect of the invention provides a preparation method of the environment-friendly water-based adhesive, which at least comprises the following steps: adding the polymer emulsion and the filler into a reaction kettle, and stirring for 30-60min until the polymer emulsion and the filler are uniformly mixed; then adding plasticizer, defoamer, thickener, surfactant and water, continuing stirring for 30-60min, and discharging to obtain the final product.

The third aspect of the invention provides application of the environment-friendly water-based adhesive to the composite bonding of metal aluminum foil and a wood board or the composite bonding of a veneer and an aluminum board.

Advantageous effects

The invention provides an environment-friendly water-based adhesive which is mainly applied to gluing of metal foil and wood board composite and has the advantages of low cost, soft adhesive layer, good high-temperature stability, good water resistance, environment friendliness, easiness in construction and the like. Meanwhile, the problem of poor affinity and adhesion between common white latex and metal foil is solved, and the white latex is easy to transport, store, use and clean.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.

In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.

In a preferred embodiment, the environment-friendly water-based adhesive comprises the following components in percentage by weight: 80% of high polymer emulsion, 10% of filler, 2% of plasticizer, 1% of defoaming agent, 1.5% of thickening agent, 0.5% of surfactant and water for supplementing 100%.

High molecular emulsion

In the invention, the high polymer emulsion is selected from at least one of polyisoprene copolymer emulsion, polyacrylate emulsion, polyurethane emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, pure acrylic emulsion, maleimide emulsion and styrene-butadiene latex.

In a preferred embodiment, the polymer emulsion is a vinyl acetate-ethylene copolymer emulsion.

The vinyl acetate-ethylene copolymer emulsion (EVA for short) is a high molecular emulsion prepared by using vinyl acetate and ethylene monomers as basic raw materials and copolymerizing the vinyl acetate and ethylene monomers with other auxiliary materials by an emulsion polymerization method. The preparation method is mainly applied to the fields of adhesives, heat preservation, water proofing, coatings, glass fibers, papermaking, engineering fabrics, textiles, cement modifiers, paper processing and the like. Wherein the adhesive field is mainly applied to wood bonding, paper bonding, aqueous laminating adhesive and cigarette adhesive. The heat-insulating mortar is applied to the building field, and comprises heat-insulating mortar, waterproof coating, building binder, interface agent and the like.

In a preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a solid content of not less than 50% by weight.

In a more preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a kinetic viscosity of 2000-4000cps at 25 ℃.

In a more preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a dynamic viscosity of 2500-3700cps at 25 ℃.

In the present invention, the source of the vinyl acetate-ethylene copolymer emulsion is not particularly limited, and taiwan Dalian chemical, type DA-101, DA-102, etc.; DA-101 is preferred.

The inventor finds that the performance of the water-based adhesive is optimal when the viscosity is 2000-4000cps, particularly 2000-4000 cps. The inventors believe that the possible reasons for this low viscosity vinyl acetate-ethylene copolymer emulsion having excellent water resistance under static load conditions, the unique property of containing a large amount of filler and still maintaining good adhesion, makes it well suited for adhesive binders where filler is used to control bond strength and cost.

Filler material

In the invention, the filler is selected from at least one of silicon dioxide, diatomite, attapulgite, mica powder, titanium dioxide, boron powder, silicon carbide, boron nitride and zirconium boride.

In a preferred embodiment, the filler is silica.

In a preferred embodiment, the particle size of the silica is not higher than 100 μm.

In a more preferred embodiment, the silica has a particle size of 0.1 to 10 μm.

In a most preferred embodiment, the silica has a particle size of 2 μm.

In the present invention, the source of the silica is not particularly limited, and Zheng Zhou Hongshuli chemical products Co.

In the invention, the weight ratio of the filler to the polymer emulsion is 1: (6-12).

In a preferred embodiment, the weight ratio of the filler to the polymer emulsion is 1: 8.

the inventor unexpectedly finds out in the experimental process that the weight ratio of the filler to the high molecular emulsion is only 1: (6-12), especially when the weight ratio of the filler to the polymer emulsion is 1: and 8, the adhesive force, the penetrating power and the bonding strength of the prepared water-based adhesive to the metal foil are optimal. When the proportion of the silicon dioxide is increased, the adhesive strength of the water-based adhesive is influenced; when the ratio is reduced, both the permeability and adhesion of the water-based adhesive to the metal foil are reduced. The inventors believe that a possible reason is that the addition of silica increases the filling properties and system stability of the water-based adhesive, which in turn increases the adhesion of the water-based adhesive to the surface of the metal foil, thereby increasing the overall bond strength. The silicon dioxide has small particle size and large surface area, and the surface silanol group and the stereo branch structure of the aggregate thereof generate a strong effect between the silicon dioxide and the vinyl acetate-ethylene copolymer emulsion molecules through hydrogen bonds or Van der Waals force, thereby achieving the reinforcing effect. Secondly, after the silicon dioxide is uniformly dispersed in a water-based adhesive system, a silicon dioxide aggregate network can be formed, and the aggregates form hydrogen bonds with polymer molecules through silanol groups (Si-OH) on the surface, so that the fluidity of the system is limited, the viscosity of the system is increased, and the bonding strength of the water-based adhesive on a matrix is improved; meanwhile, under the action of shearing force, hydrogen bonds and silicon dioxide networks are damaged, so that the viscosity of the system is reduced, a thixotropic effect is generated, the water-based adhesive is convenient to construct, and once the shearing force is eliminated, the silicon dioxide networks and the hydrogen bonds are formed again, so that the sedimentation of the product during storage and the sagging of the product during use are effectively prevented. In the invention, the addition of the silicon dioxide can not only improve the bonding strength of the water-based adhesive, but also greatly prolong the storage stability of the water-based adhesive.

Plasticizer

Plasticizers are additives for polymer materials, which are widely used in industrial production, and are also called plasticizers. Any substance added to a polymeric material that increases the plasticity of the polymer is called a plasticizer. The plasticizer can improve the performance of the high polymer material, reduce the production cost and improve the production benefit. The plasticizer is an important chemical product additive, is generally applied to materials such as plastic products, concrete, mud ash, cement, gypsum, cosmetics, cleaning agents and the like as an auxiliary agent, particularly polyvinyl chloride plastic products, and is required to be added with phthalate in order to increase the plasticity of the plastic and improve the strength of the plastic, wherein the content of the phthalate can sometimes reach 50 percent of the product. The plasticizer mainly has the effects of weakening the secondary valence bonds among resin molecules, increasing the mobility of the molecular bonds of the resin, reducing the crystallinity of the resin molecules, increasing the plasticity of the resin molecules, enhancing the flexibility of the resin molecules, being easy to process, being legally applicable to industrial application, and being widely existed in food packaging, cosmetics, medical devices and environmental water.

In the present invention, the plasticizer is not particularly limited, and one of a citrate-based plasticizer and an epoxy-based plasticizer may be mentioned.

As the citrate-based plasticizer, for example, tributyl citrate (TBC), trioctyl citrate (TOC), acetyl tributyl citrate (ATBC), acetyl trioctyl citrate (ATOC), and the like can be mentioned.

As the epoxy plasticizer, epoxidized soybean oil, epoxidized acetyl methyl linoleate, epoxidized butyl furoate, epoxidized butyl pupate oleate, epoxidized octyl soyate oleate, epoxidized octyl 9, 10-epoxystearate and the like can be mentioned.

In a preferred embodiment, the plasticizer is trioctyl citrate.

Defoaming agent

Defoamers are substances that reduce the surface tension of water, solutions, suspensions, etc., prevent the formation of foam, or reduce or eliminate the original foam. The application of the defoaming agent is very wide, such as the food industry, the paper industry, the water treatment industry, the oil extraction industry, the printing and dyeing industry, the coating industry, the detergent industry, the rubber latex industry, the aerosol industry, the daily chemical industry, the medical industry, the dairy industry and the like.

In the present invention, the defoaming agent is not particularly limited, and non-silicon type defoaming agents, polyether type defoaming agents, silicone type defoaming agents, polyether modified silicone type defoaming agents, and the like can be mentioned.

In a preferred embodiment, the defoamer is a silicone type defoamer.

In the present invention, the source of the silicone type defoaming agent is not particularly limited, and (Shanghai) Hodgkin Chemicals Co., Ltd., model L-101 can be mentioned.

Thickening agent

The thickener is also called gelling agent, and is a substance capable of increasing the viscosity of latex and liquid. The thickening agent can improve the viscosity of the system, so that the system can keep a uniform and stable suspension state and an emulsion state or form gel; most thickeners combine an emulsifying action. Can be divided into two main categories of natural and synthetic. The natural products are mostly prepared from plants and seaweed containing polysaccharide viscous substances, such as starch, acacia, pectin, agar, gelatin, seaweed gel, carrageenan, dextrin, etc., and general gelatin, soluble starch, polysaccharide derivatives, etc. can be used in cosmetics; the synthetic product includes carboxymethyl cellulose, propylene glycol alginate, methyl cellulose, sodium starch phosphate, sodium carboxymethyl cellulose, sodium alginate, casein, sodium polyacrylate, polyoxyethylene, and polyvinylpyrrolidone.

Thickeners are widely used in foods (e.g., food additives for increasing food viscosity or forming gel in sauces, jams, ice creams, cans, etc.), cosmetics, detergents, emulsions, printing and dyeing, pharmaceuticals, rubbers, paints, and the like.

In the present invention, the thickener is not particularly limited, and one of a high molecular thickener and a low molecular thickener may be mentioned.

As the polymer thickener, there may be mentioned inorganic thickeners, cellulose thickeners, polyacrylic acid thickeners, polyurethane thickeners, polyoxyethylene thickeners and the like.

As the low-molecular-weight thickener, there may be mentioned inorganic salt-type thickeners, fatty alcohols, fatty acid-type thickeners, alkanolamide-type thickeners, ether-type thickeners, ester-type thickeners, amine oxide thickeners, and the like.

In a preferred embodiment, the thickener is at least one of hydroxyethyl cellulose, gum arabic and acrylate resin

In a more preferred embodiment, the thickening agent is gum arabic.

The inventors believe that the addition of a certain amount of thickener in the present invention increases the viscosity of the gel and improves the adhesion between the water-based adhesive and the metal foil. If the amount of the tackifier is too small, the viscosity of the water-based adhesive is too small, the gluing amount is insufficient, the metal foil is smooth, and the water-based adhesive is easy to flow off when the viscosity of the water-based adhesive is complemented; if the amount of the tackifier is too much, the viscosity of the water-based adhesive is too high, resulting in a decrease in leveling property of the adhesive and difficulty in construction.

Surface active agent

Surfactant (surfactant) is a substance added in a small amount to change the interface state of a solution system obviously. Has fixed hydrophilic and lipophilic groups and can be directionally arranged on the surface of the solution. The molecular structure of the surfactant has amphipathy: one end is a hydrophilic group, and the other end is a hydrophobic group; the hydrophilic group is often a polar group, such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amino groups and salts thereof, hydroxyl, amide, ether linkages, and the like may also be used as the polar hydrophilic group; and the hydrophobic group is often a non-polar hydrocarbon chain, such as a hydrocarbon chain of 8 or more carbon atoms.

In the present invention, the surfactant is at least one selected from the group consisting of a cationic surfactant, an anionic surfactant and a nonionic surfactant.

In a preferred embodiment, the surfactant is an anionic surfactant.

In a more preferred embodiment, the anionic surfactant is at least one selected from the group consisting of fatty acid salts, sulfonic acid salts, sulfuric acid ester salts, and phosphoric acid ester salts.

In a most preferred embodiment, the surfactant is dioctyl sodium sulfosuccinate.

In the present invention, the source of the dioctyl sodium sulfosuccinate is not particularly limited, and there may be mentioned the company Rodia, model OT-75.

The inventor finds that the addition of the surfactant can obviously improve the permeability and the adhesive force of the water-based adhesive, the metal foil and other metal smooth planes, and particularly, the adhesive force of the water-based adhesive and the metal foil is optimal when the anionic surfactant dioctyl sodium sulfosuccinate is selected.

Water (W)

In the present invention, the water is not particularly limited, and tap water, deionized water, distilled water and the like can be mentioned.

In a preferred embodiment, the water is deionized water.

The second aspect of the invention provides a preparation method of the environment-friendly water-based adhesive, which at least comprises the following steps: adding the polymer emulsion and the filler into a reaction kettle, and stirring for 30-60min until the polymer emulsion and the filler are uniformly mixed; then adding plasticizer, defoamer, thickener and water, continuing stirring for 30-60min, and discharging to obtain the final product.

The third aspect of the invention provides application of the adhesive, which is applied to the composite bonding of a metal aluminum foil and a wood board or the composite bonding of a veneer and an aluminum board.

The fourth aspect of the invention provides a use method of the water-based adhesive, which comprises the following steps: the water-based adhesive and isocyanate are uniformly mixed and then can be used.

In a preferred embodiment, the weight ratio of the water-based glue to the isocyanate is 100: (1-10).

In a more preferred embodiment, the weight ratio of water-based glue to isocyanate is 100: (2-5).

In a most preferred embodiment, the weight ratio of water-based glue to isocyanate is 100: 4.

the inventors have found that the isocyanate of the present invention can be used as a curing agent in combination with a water-based adhesive. The water-based adhesive and the curing agent are mixed on site and are uniformly stirred according to the proportion for use. The inventors have found that, in particular when the weight ratio of water-based glue to isocyanate is 100: (2-5), the adhesive has the best service performance, and after the water-based adhesive and the curing agent are mixed, the adhesive needs to be used within 2 hours, otherwise, the adhesive fails. Meanwhile, the water-based adhesive does not contain a reinforcing agent and can be used alone, but the heat resistance and the strength are reduced.

Isocyanates

Monoisocyanate is an important intermediate in organic synthesis, can be prepared into a series of carbamate pesticides, bactericides and herbicides, and is also used for improving the water resistance of plastics, fabrics, leather and the like. The isocyanate with two or more functional groups can be used for synthesizing a series of polyurethane foam plastics, rubber, elastic fibers, coatings, adhesives, synthetic leather, artificial wood and the like with excellent performance. The current application is the widest and the yield is the following: toluene Diisocyanate (Toluene Diisocyanate, TDI for short); diphenylmethane diisocyanate (MDI for short).

In the present invention, the isocyanate is a mixture of high-functionality isocyanate and diphenylmethane diisocyanate; the isocyanate has a functionality of 2.5 to 3.

In a preferred embodiment, the isocyanate has a functionality of from 2.6 to 2.7.

In a preferred embodiment, the isocyanate has a kinetic viscosity of 150-250cps at 25 ℃.

In a more preferred embodiment, the isocyanate has a dynamic viscosity of 200-220cps at 25 ℃.

In the present invention, the source of the isocyanate is not particularly limited, and there may be mentioned 5005 of Hensman, M200 of Mitsui Japan.

The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.

In addition, the starting materials used are all commercially available, unless otherwise specified.

Examples

Example 1

Embodiment 1 provides an environment-friendly water-based adhesive, which comprises the following components in percentage by weight: comprises the following components: 80% of high polymer emulsion, 10% of filler, 2% of plasticizer, 1% of defoaming agent, 1.5% of thickening agent, 0.5% of surfactant and water for supplementing 100%.

The polymer emulsion is vinyl acetate-ethylene copolymer emulsion, has a kinetic viscosity of 2000 +/-500 cps at 25 ℃, and is purchased from Dalian chemical of Taiwan, model number DA-101.

The filler is silicon dioxide; the particle size of the silicon dioxide is 2 mu m, and the silicon dioxide is purchased from Zhengzhou Hongshuli chemical product company Limited.

The plasticizer is trioctyl citrate.

The defoaming agent is an organic silicon type defoaming agent which is purchased from (Shanghai) Ridge chemical auxiliary agent Co., Ltd., model L-101.

The thickening agent is gum arabic.

The surfactant was dioctyl sodium sulfosuccinate, purchased from Rhodia corporation, model OT-75.

The water is deionized water.

The preparation method of the environment-friendly water-based adhesive comprises the following steps: adding the polymer emulsion and the filler into a reaction kettle, and stirring for 60min until the polymer emulsion and the filler are uniformly mixed; then adding plasticizer, defoamer, thickener and water, continuing stirring for 60min, and discharging to obtain the product.

The application method of the water-based adhesive is that the water-based adhesive and isocyanate are uniformly mixed and then can be used; the weight ratio of the water-based adhesive to the isocyanate is 100: 4.

the isocyanate has a functionality of 2.6 to 2.7 and a kinetic viscosity of 220cps at 25 ℃ selected from Henschel, model 5005.

Example 2

Embodiment 2 provides an environment-friendly water-based adhesive, which comprises the following components in percentage by weight: comprises the following components: 60% of polymer emulsion, 10% of filler, 3% of plasticizer, 1.5% of defoaming agent, 3% of thickening agent, 5% of surfactant and water which are added to make up 100%.

The plasticizer is trioctyl citrate.

The thickening agent is gum arabic.

The water is deionized water.

The application method of the water-based adhesive is that the water-based adhesive and isocyanate are uniformly mixed and then can be used; the weight ratio of the water-based adhesive to the isocyanate is 100: 1; the isocyanate has a functionality of 2.6 to 2.7 and a kinetic viscosity of 220cps at 25 ℃ selected from Henschel, model 5005.

Example 3

Embodiment 3 provides an environment-friendly water-based adhesive, which comprises the following components in percentage by weight: comprises the following components: 84% of high polymer emulsion, 7% of filler, 1% of plasticizer, 0.2% of defoaming agent, 0.5% of thickening agent, 0.1% of surfactant and water to make up 100%.

The plasticizer is trioctyl citrate.

The thickening agent is gum arabic.

The water is deionized water.

The application method of the water-based adhesive comprises the following steps: the water-based adhesive and isocyanate are uniformly mixed and then can be used; the weight ratio of the water-based adhesive to the isocyanate is 100: 1; the isocyanate has a functionality of 2.6 to 2.7 and a kinetic viscosity of 220cps at 25 ℃ selected from Henschel, model 5005.

Example 4

Example 4 differs from example 1 in that the polymer emulsion is a vinyl acetate-ethylene copolymer emulsion having a dynamic viscosity of 750 + -250cps at 25 deg.C and is available from Kyowa Kawaki chemical Co., Ltd., Guangzhou under the brand name GW-707.

Example 5

Example 5 is different from example 1 in that the filler silica has a fineness of 325 mesh and is purchased from Jinnan silver chemical Co.

Example 6

Example 6 differs from example 1 in that the weight ratio of silica to vinyl acetate-ethylene copolymer emulsion is 1: 30.

example 7

Example 7 differs from example 1 in that the weight ratio of silica to vinyl acetate-ethylene copolymer emulsion is 1: 3.

example 8

Example 8 differs from example 1 in that no surfactant is included.

Performance testing

The water-based adhesives prepared in the embodiments 1 to 7 of the invention are respectively adopted to prepare the aluminum foil composite board, and the adhesive application amount is 120g/m²The aging time is 20min, the material selection, the preparation method and the process parameters of the aluminum foil composite board are all technical schemes familiar to the technical personnel in the field, and the dry-state and wet-state bonding strength of the plywood is tested according to GB/T17657-1999 Experimental method for the physical and chemical properties of the artificial board and the facing artificial board.

The wet bonding strength is detected according to a II-type plywood test method: the test piece was immersed in hot water at 63. + -. 3 ℃ for 3 hours, taken out and then cooled at room temperature for 10 min.

The dry and wet bonding strength of the plywood is more than 0.70MPa, and the requirements of II-type plywood are met.

The detection results show that the bonding strength of the embodiments 1 to 3 meets the requirements of the II-type plywood; examples 4-8 do not meet the requirements for type II plywood.

The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims

1. The environment-friendly water-based adhesive is characterized by at least comprising the following components in percentage by weight: 60-90% of high polymer emulsion, 2-12% of filler, 1-3% of plasticizer, 0.2-1.5% of defoaming agent, 0.1-5% of surfactant, 0.5-3% of thickening agent and water for supplementing 100%.

2. The environmentally friendly water-based adhesive of claim 1, wherein the polymer emulsion is at least one selected from the group consisting of polyisoprene copolymer emulsion, polyacrylate emulsion, polyurethane emulsion, polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, acrylic emulsion, maleimide emulsion and styrene-butadiene latex.

3. The environment-friendly water-based adhesive according to claim 2, wherein the vinyl acetate-ethylene copolymer emulsion has a solid content of not less than 50 wt%.

4. The environment-friendly water-based adhesive as claimed in claim 2 or 3, wherein the vinyl acetate-ethylene copolymer emulsion has a kinetic viscosity of 2000-4000cps at 25 ℃.

5. The environmentally friendly water-based adhesive of claim 1, wherein the filler is selected from at least one of silica, diatomaceous earth, attapulgite, mica powder, titanium dioxide, boron powder, silicon carbide, boron nitride and zirconium boride.

6. The environment-friendly water-based adhesive according to claim 1, wherein the weight ratio of the filler to the polymer emulsion is 1: (6-12).

7. The environmentally friendly water-based adhesive of claim 5, wherein the isocyanate is a mixture of high functionality isocyanate and diphenylmethane diisocyanate; the isocyanate has a functionality of 2.5 to 3.

8. The environmentally friendly water-based adhesive as claimed in claim 7, wherein the isocyanate has a kinetic viscosity of 150-250cps at 25 ℃.

9. A method for preparing the environment-friendly water-based adhesive according to any one of claims 1 to 8, which is characterized by comprising at least the following steps: adding the polymer emulsion and the filler into a reaction kettle, and stirring for 30-60min until the polymer emulsion and the filler are uniformly mixed; then adding plasticizer, defoamer, thickener, surfactant and water, continuing stirring for 30-60min, and discharging to obtain the final product.

10. The use of the environmentally friendly water based adhesive according to any one of claims 1 to 8, wherein the adhesive is used for bonding a metal aluminum foil and a wood board or bonding a veneer and an aluminum board.