阅读说明：本技术 一种水基胶及其制备方法和应用 (Water-based adhesive and preparation method and application thereof ) 是由 凌万青 于 2020-04-29 设计创作，主要内容包括：本发明涉及胶粘剂技术领域,具体涉及一种水基胶及其制备方法和应用。一种水基胶,按重量百分比计,至少包括以下组分：醋酸乙烯-乙烯共聚乳液60-90％、丁苯胶乳2-15％、增塑剂1-3％、消泡剂0.2-1.5％、水补足100％。本发明提供了一种水基胶,主要应用于家具封边领域,特别适用于无纺布与木皮的复合粘结,与普通白乳胶相比,本发明水基胶胶层柔软型好,解决了胶层太硬,不合适成卷运输和储存的问题；耐高温性能、耐水性和抗老化性能优异,解决了板材封边后,封边条在高温高湿环境下,木皮与无纺布分层的问题；且不渗胶、不透胶,与基体间的粘结强度高。(The invention relates to the technical field of adhesives, in particular to a water-based adhesive and a preparation method and application thereof. A water-based adhesive at least comprises the following components in percentage by weight: 60-90% of vinyl acetate-ethylene copolymer emulsion, 2-15% of styrene-butadiene latex, 1-3% of plasticizer, 0.2-1.5% of defoaming agent and water for supplementing 100%. The invention provides a water-based adhesive, which is mainly applied to the field of edge sealing of furniture and is particularly suitable for composite bonding of non-woven fabrics and veneers; the high-temperature resistance, the water resistance and the ageing resistance are excellent, and the problem that the veneer and the non-woven fabric are layered in a high-temperature and high-humidity environment of the edge banding strip after the edge banding of the plate is performed is solved; and the adhesive is not penetrated and penetrated, and the bonding strength between the adhesive and the matrix is high.)

1. The water-based adhesive is characterized by at least comprising the following components in percentage by weight: 60-90% of vinyl acetate-ethylene copolymer emulsion, 2-15% of styrene-butadiene latex, 1-3% of plasticizer, 0.2-1.5% of defoaming agent and water for supplementing 100%.

2. The water-based adhesive as claimed in claim 1, wherein the dynamic viscosity of the vinyl acetate-ethylene copolymer emulsion at 25 ℃ is 500-5000 cP.

3. The water-based adhesive of claim 1, wherein the styrene-butadiene latex is carboxylated styrene-butadiene latex.

4. The water-based glue of claim 1 or 3, wherein the kinetic viscosity of the styrene-butadiene latex is 50-500cP at 25 ℃.

5. The water-based adhesive according to claim 1, wherein the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is (5-15): 1.

6. a method for preparing a water-based glue according to any one of claims 1 to 5, characterised in that it comprises at least the following steps: adding the vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex into a reaction kettle, and stirring for 30-60min until the vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex are uniformly mixed; then adding plasticizer, defoaming agent and water, continuously stirring for 30-60min, and discharging to obtain the product.

7. The use of the water-based adhesive according to any one of claims 1 to 5, in the field of wood veneer and non-woven fabric compounding.

8. A method for using the water-based adhesive according to any one of claims 1 to 5, wherein the water-based adhesive is ready to use after being uniformly mixed with isocyanate; the weight ratio of the water-based adhesive to the isocyanate is 100: (1-10).

9. The water-based glue of claim 8, wherein the isocyanate is a diisocyanate.

10. The water-based adhesive of claim 9, wherein the diisocyanate is selected from at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.

Technical Field

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

Background

As materials, processes and materials for furniture manufacturing are continuously updated and developed, MDF medium density boards, Particle Boards (PB) and plywood are increasingly used in furniture manufacturing. These panels require edge sealing during use, traditionally using edge sealing strips of polymeric materials such as PVC film, but lack the natural return feel. As people pursue natural style, medium and high-grade furniture with veneering veneers on artificial boards appears. The furniture uses artificial boards, has low manufacturing cost, and can give people a natural style similar to all solid wood. Meanwhile, the edges of the board need to be sealed by natural wood as the front surface of the board. At present, in order to save wood and reduce cost, the edges of the plate are made of veneers, the edge sealing veneers are thin and are generally about 0.15-0.6mm, and the edge sealing veneers are easy to break and crack and are seriously wasted in the processes of storage, transportation and use. In order to solve the problem, a process for compounding a layer of non-woven fabric on the back of the veneer is provided, and the veneer is fixed by the non-woven fabric, so that the veneer is not easy to break and crack, is easy to roll, and is convenient to transport, store and use.

At present, the traditional white latex is used for compounding non-woven fabrics and veneers in the market, so that a plurality of defects and problems exist, and the problem is urgently needed to be solved. The invention mainly aims at the problems of production, compounding, storage, transportation and use of non-woven fabric veneers, and provides a special water-based adhesive which is high temperature resistant, water resistant, non-permeable and soft in adhesive layer.

Disclosure of Invention

In order to solve the technical problem, the first aspect of the present invention provides a water-based adhesive, which at least comprises the following components by weight: at least comprises the following components: 60-90% of vinyl acetate-ethylene copolymer emulsion, 2-15% of styrene-butadiene latex, 1-3% of plasticizer, 0.2-1.5% of defoaming agent and water for supplementing 100%.

As a preferable technical scheme of the invention, the dynamic viscosity of the vinyl acetate-ethylene copolymer emulsion at 25 ℃ is 500-5000 cP.

As a preferred technical scheme of the invention, the styrene-butadiene latex is carboxylic styrene-butadiene latex.

As a preferable technical scheme of the invention, the dynamic viscosity of the styrene-butadiene latex at 25 ℃ is 50-500 cP.

As a preferable technical scheme of the invention, the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is (5-15): 1.

the second aspect of the invention provides a preparation method of the water-based adhesive, which at least comprises the following steps: adding the vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex into a reaction kettle, and stirring for 30-60min until the vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex are uniformly mixed; then adding plasticizer, defoaming agent and water, continuously stirring for 30-60min, and discharging to obtain the product.

The third aspect of the invention provides application of the water-based adhesive, which is applied to the field of wood veneer and non-woven fabric compounding.

The fourth aspect of the invention provides a using method of the water-based adhesive, wherein the water-based adhesive can be used after being uniformly mixed with isocyanate; the weight ratio of the water-based adhesive to the isocyanate is 100: (1-10).

In a preferred embodiment of the present invention, the isocyanate is diisocyanate.

In a preferred embodiment of the present invention, the diisocyanate is at least one selected from the group consisting of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.

Advantageous effects

The invention provides a water-based adhesive, which is mainly applied to the field of furniture edge sealing, is particularly suitable for composite adhesion of non-woven fabrics and veneers, ensures that the veneers are not easy to break by compounding a layer of non-woven fabrics on the back surfaces of the veneers, can be rolled and is convenient to transport and store. Compared with the common white latex, the water-based latex provided by the invention has the following advantages:

(1) the common white latex (polyvinyl acetate emulsion) is used for compounding the veneer and the non-woven fabric, although the strength of the glue layer is enough, the glue layer is hard after the glue is dried, and the veneer is easy to crack during transportation and coiling; the water-based adhesive layer is good in softness, and the problem that the adhesive layer is too hard and is not suitable for being transported and stored in a coiled mode is solved.

(2) When the non-woven fabric veneer is used as a furniture edge sealing strip, the operation temperature of the edge sealing process is 130-220 ℃, the non-woven fabric veneer and the veneer are easy to fall off and glue is easily separated in the edge sealing process, and the bonding effect is poor; the water-based adhesive disclosed by the invention is excellent in high-temperature resistance and good in bonding effect.

(3) The common water-based adhesive has poor water resistance and ageing resistance, and is easy to degum and crack under the environments of different temperatures and humidity; the water-based adhesive disclosed by the invention is excellent in water resistance and ageing resistance, and solves the problem that wood veneers and non-woven fabrics are layered in a high-temperature and high-humidity environment of furniture edge sealing strips after edge sealing of plates.

(4) Common white latex is easy to permeate through wood veneer and non-woven fabric, so that the latex penetrates, black spots are formed, and the appearance is influenced. The water-based adhesive solves the problems of adhesive permeation and adhesive penetration.

(5) The compounding process of non-woven fabric and veneer is generally a continuous roller pressing process, a heating device is arranged in the roller, and common white latex is not high-temperature resistant and is not suitable for the compounding process.

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 order to solve the technical problem, the first aspect of the present invention provides a water-based adhesive, which at least comprises the following components by weight: 60-90% of vinyl acetate-ethylene copolymer emulsion, 2-15% of styrene-butadiene latex, 1-3% of plasticizer, 0.2-1.5% of defoaming agent and water for supplementing 100%.

In a preferred embodiment, the water-based adhesive comprises the following components in percentage by weight: 85% of vinyl acetate-ethylene copolymer emulsion, 10% of styrene-butadiene latex, 2% of plasticizer, 1% of defoaming agent and the balance of water to 100%.

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 the invention, the dynamic viscosity of the vinyl acetate-ethylene copolymer emulsion at 25 ℃ is 500-5000 cP.

In a preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a dynamic viscosity of 2500-4500cP at 25 ℃.

In a preferred embodiment, the vinyl acetate-ethylene copolymer emulsion has a pH of 4.5 to 6.5.

In the present invention, the source of the vinyl acetate-ethylene copolymer emulsion is not particularly limited, and there may be mentioned at least one of taiwan Dalian chemical DA-101, DA-102, DA-143; DA-102 is preferred.

Styrene-butadiene latex

The styrene-butadiene latex is prepared by emulsion copolymerization of butadiene and styrene. Different grades are available according to the ratio of styrene to butadiene. The emulsion has the components of high-temperature (50 ℃) styrene-butadiene latex and low-temperature (5 ℃) styrene-butadiene latex according to different copolymerization temperatures of the emulsions, and the latter has better performance than the former, high strength and good cold resistance. The styrene-butadiene latex adhesive has better heat resistance and aging resistance than the natural latex adhesive, and is not sticky, softened and hardened even after aging. The styrene-butadiene latex adhesive has extremely low macromolecular chain property, so the adhesive strength is poor, but the price is low, and the styrene-butadiene latex adhesive is mainly used for paper processing, can be used as an adhesive for plastics, rubber, fabrics, tire cords, asbestos sealing gaskets and building materials, and can also be used for preparing pressure-sensitive adhesives. In order to improve the adhesion of the styrene-butadiene rubber daily adhesive, rosin, coumarone resin, polybasic acid ester and the like can be added, so that the adhesion can be obviously improved.

In the invention, the styrene-butadiene latex is carboxylic styrene-butadiene latex.

In a preferred embodiment, the kinetic viscosity of the styrene-butadiene latex is 50 to 500cP at 25 ℃.

In the present invention, the source of the styrene-butadiene latex is not particularly limited, and at least one of basf SD332N, SD417, SD516, SD507, SD6519, and SD 903; preferably SD 507.

In the invention, the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is (5-15): 1.

in a preferred embodiment, the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is (6-10): 1.

in a more preferred embodiment, the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is 8: 1.

the inventor unexpectedly finds that when the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is (5-15): 1, particularly when the weight ratio of the vinyl acetate-ethylene copolymer emulsion to the styrene-butadiene latex is 8: 1, the prepared water-based adhesive layer has the best permeability resistance and temperature resistance. The inventors consider that possible reasons are: the similarity of molecular structures of the vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex is compounded into a high-efficiency stable polymer emulsion, the molecules are interwoven to form a three-dimensional network structure, the emulsion breaking is not easy to occur in the coating process, the adhesive is not leaked after the film forming, and the temperature resistance is excellent; the polymer emulsion molecular structure is rich in polar group-carboxyl, has higher film forming property and binding power, and can generate a strong and tough adhesive film; meanwhile, the styrene-butadiene latex can adjust the viscosity of the glue solution, improve the fluidity of the glue solution and form a bright and smooth film; in addition, because the molecular chain also contains polar groups, such as ester groups, the bonding property with the non-woven fabric fiber is good, and the high bonding property is realized.

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 epoxy acetyl methyl linoleate.

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 polyether modified silicone type defoamer.

In the present invention, the source of the silicone type defoaming agent is not particularly limited, and there can be mentioned model DF-2684, Defeng defoaming agent Co., Ltd., Dongguan.

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 vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex into a reaction kettle, and stirring for 30-60min until the vinyl acetate-ethylene copolymer emulsion and the styrene-butadiene latex are uniformly mixed; then adding plasticizer, defoaming agent and water, continuously stirring for 30-60min, and discharging to obtain the product.

The third aspect of the invention provides application of the water-based adhesive, which is applied to the field of wood veneer and non-woven fabric compounding.

In a preferred embodiment, the water-based adhesive is applied to composite bonding of non-woven fabrics and wood veneers.

The fourth aspect of the invention provides a use method of the adhesive, which comprises the following steps: the application method of the water-based adhesive is characterized in that the water-based adhesive can be used after being uniformly mixed with isocyanate; the weight ratio of the water-based adhesive to the isocyanate is 100: (1-10).

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 diisocyanate.

In a preferred embodiment, the diisocyanate is selected from at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.

In a more preferred embodiment, the isocyanate is diphenylmethane diisocyanate.

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.

In the invention, the weight ratio of the water-based adhesive to the isocyanate is 100: (1-10).

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

In a more preferred embodiment, the weight ratio of water-based glue to isocyanate is 100: 3.

in the research process, the inventor finds that the water-based adhesive is mixed with isocyanate and then used, and particularly when the weight ratio of the water-based adhesive to the isocyanate is 100: 3, the strength, temperature resistance and water resistance of the prepared water-based adhesive are obviously improved. The inventors consider that possible reasons are: in the using process of the water-based adhesive, isocyanate and hydroxyl are crosslinked to form firm chemical bonds such as urethane bond, urea bond and the like; and simultaneously, carboxyl in the water-based adhesive can react with isocyanate groups to form a water-insoluble reticular cross-linked structure, so that the isocyanate and the water-based adhesive generate a synergistic effect, and the strength, the temperature resistance and the water resistance of the water-based adhesive are effectively improved. In the invention, isocyanate is used as a curing agent to be matched with 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. After the glue is mixed with the curing agent, the glue must be used within 2 hours, otherwise the glue is ineffective. The water-based adhesive of the invention can be used alone without a reinforcing agent, but the heat resistance and the strength are obviously reduced.

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.