CN113652132B

CN113652132B - Sealing primer for wood and wooden product made of sealing primer

Info

Publication number: CN113652132B
Application number: CN202010396446.6A
Authority: CN
Inventors: 吴赛; 熊荣; 刘一江; 尼廷·G·贾达夫
Original assignee: Guangdong Huarun Paints Co Ltd
Current assignee: Guangdong Huarun Paints Co Ltd
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2023-12-22
Anticipated expiration: 2040-05-12
Also published as: CN113652132A

Abstract

The invention relates to a seal primer for woodware and a wooden product made of the seal primer, wherein the seal primer for woodware comprises aqueous latex of anionic resin, a film forming additive and an additional additive; and wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 10%, the water absorption being measured and calculated according to a capacitance method.

Description

Sealing primer for wood and wooden product made of sealing primer

Technical Field

The invention relates to a seal primer for woodware, and a formed paint film has good sealing property and polishing property.

Background

Wood products, including wood furniture, are the most commonly used products in production and life, and are mainly made of wood substrates. It is known that wood substrates have special textures, natural colors, and other materials that are incomparable with each other. However, wood substrates inevitably have characteristics of complex structure, uneven material, porosity, swelling with water, and the like, and contain undesirable substances such as grease, tannin, and other colored impurities, and are not ideal industrial materials. Therefore, the study of wood paints capable of providing a protective layer for wood substrates is particularly interesting.

In the woodware sealer market, the cationic resin-containing primer occupies a portion of about 90%. However, the cationic resin requires additional equipment cleaning and has poor formulation stability, thereby causing problems of time consumption, high cost, and the like. Therefore, the preparation of primer for woodware by adopting anionic resin to replace cationic resin is likely to be a development direction in the future.

However, the blocking function of the primer containing the anionic resin is realized by sacrificing the hardness of a paint film, and the woodware can be blocked to a certain extent. But the grindability of the paint film tends to be insufficient for customer requirements.

Therefore, there is a need in the wood lacquer art for a primer sealer comprising an anionic resin which combines the grindability of the paint film and achieves a sealer performance comparable to that of a primer comprising a cationic resin.

Disclosure of Invention

The invention provides a seal primer for woodware, which comprises aqueous latex of anionic resin, a film forming additive and an additional additive; and wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 10%, the water absorption being measured and calculated according to a capacitance method.

In an embodiment according to the invention, the film formed from the aqueous latex of the anionic resin has a water absorption of at most 8%, preferably at most 6%, more preferably at most 4.5%.

According to another aspect of the present invention, there is provided a sealer for woodware, wherein the sealer comprises, relative to the total weight of the sealer:

50 to 90% by weight of an aqueous latex of an acrylic resin;

2 to 10 weight percent of a film forming aid selected from the group consisting of alcohol ethers and diesters;

0 to 8 weight percent of a filler selected from zinc stearate, talc, or combinations thereof;

0.4 to 1 weight percent of a thickener selected from the group consisting of cellulose ether-based thickeners, alkali swellable thickeners, polyurethane-based thickeners, or combinations thereof;

0 to 0.9 wt% of a dispersant selected from polyacrylate dispersants;

0.4 to 1wt% of a wetting agent selected from silicone-based wetting agents, acetylenic diol-based wetting agents, or combinations thereof;

0.2 to 0.8 wt% of an antifoaming agent selected from the group consisting of organosiloxane antifoaming agents, mineral oil antifoaming agents, or combinations thereof;

0 to 0.3 wt% of a pH adjustor selected from the group consisting of aqueous ammonia, organic amines, or a combination thereof;

0 to 0.5 wt% of a preservative selected from isothiazolinones, benzimidazoles, or any combination thereof;

0 to 0.5 wt% of a mildew inhibitor selected from isothiazolinones, iodopropargyls, carbendazim, diuron, or any combination thereof; and

0 to 30% by weight of an aqueous medium,

wherein the film formed from the aqueous latex of the acrylic resin has a water absorption of at most 10%, the water absorption being tested and calculated according to a capacitance method.

According to another aspect of the present invention, there is provided a wood product comprising:

a wood substrate having at least one major surface; and

a primer sealer layer formed from the primer sealer for woodware according to the present invention coated on the main surface.

In certain embodiments according to the present invention, the wood substrate has a tannin content of at least 0.1wt%, preferably at least 1wt%, more preferably at least 5wt%, even more preferably at least 10wt%, and yet more preferably at least 30wt%, as determined by standard CNS 4716-2005.

In the present invention, applicants have originally utilized the water absorption of films formed from anionic resin aqueous latices tested and calculated according to the capacitance method to establish a correlation between this water absorption and film sealing properties (e.g., sealing tannins), providing a new concept for the selection of film forming resins in a woodware sealer, which has not been recognized before the present invention.

The details of one or more embodiments of the invention are set forth in the description below. Other features, objects, and advantages of the invention will be apparent from the description and claims.

Definition of the definition

As used herein, "a," "an," "the," "at least one," and "one or more" are used interchangeably, as well as in instances where no quantitative terms are used. Thus, for example, a component comprising "an" additive may be interpreted to mean that the component comprises "one or more" additives.

Where a composition is described as comprising or including a particular component, it is contemplated that optional components not referred to by the present invention are not excluded from the composition, and that the composition may consist or consist of the recited components, or where a method is described as comprising or including a particular process step, it is contemplated that optional process steps not referred to by the present invention are not excluded from the method, and that the method may consist or consist of the recited process steps.

For simplicity, only a few numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form a range not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and any upper limit may be combined with any other upper limit to form a range not explicitly recited. Furthermore, each point or individual value between the endpoints of the range is included within the range, although not explicitly recited. Thus, each point or individual value may be combined as a lower or upper limit on itself with any other point or individual value or with other lower or upper limit to form a range that is not explicitly recited.

The term "major surface" when used in the context of a wood substrate is a surface formed by the length and width dimensions of the wood substrate for providing decoration.

As used herein, the term "primer" refers to a coating composition that can be applied to a wooden substrate and dried, crosslinked, or otherwise hardened to form a non-tacky continuous film with sufficient adhesion to the substrate surface.

The term "on" when used in the context of "applying a coating on" includes applying one coating directly or indirectly to another coating.

As used herein, the term "anionic resin" refers to a linear or crosslinked resin containing anionic groups on the side or end chains of the resin polymer.

The terms "comprising" and "including" and variations thereof, when appearing in the specification and claims, are not intended to be limiting.

The terms "preferred" and "preferably" refer to embodiments of the invention that may provide certain benefits in certain circumstances. However, other embodiments may be preferred under the same or other circumstances. In addition, recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the invention.

Detailed Description

In one aspect, the invention provides a primer sealer for woodware, comprising an aqueous latex of an anionic resin, a film-forming aid, and additional additives; and wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 10%, the water absorption being measured and calculated according to a capacitance method.

In an embodiment of the invention, the primer comprises an aqueous latex of an anionic resin having a water absorption value (i.e., up to 10%) after film formation. Preferably, the film formed from the aqueous latex of the anionic resin has a water absorption of at most 8%, preferably at most 6%, more preferably at most 4.5%, the water absorption being measured and calculated according to the capacitive method.

In the present application, "water absorption" is a characteristic parameter of a film (or called a dry coating) formed by an aqueous latex of a certain resin, and specifically, means the absorption rate of an aqueous solution by the dry coating obtained after the aqueous latex is formed into a film and dried. The method for measuring the water absorption of the aqueous latex of the resin includes a weighing method and a capacitance method, and the water absorption of the aqueous latex of the resin is measured and calculated by the capacitance method in the present application. Since the dielectric properties of the dried coating formed from the aqueous latex of the resin change as it absorbs the aqueous solution, electrochemical impedance spectroscopy (electrochemical impedance spectroscopy, EIS) can be used to determine the capacitance values before and after water absorption, and the water absorption value is calculated. This capacitance method is described, for example, in "Characterization of Water Uptake by Organic Coatings Used for the Corrosion Protection of Steel as Determined from Capacitance Measurements", C.Moreno1, S.Hern ndez1, J.J.Santana2, J.Gonz a lez-Guzm n1, R.M.Souto, S.Gonz a lez, int.j. Electrochem.sci.,7 (2012) 8444-8457. In certain embodiments of the invention, the water absorption Φ is calculated by the following formula:

wherein Φ is the water absorption; c (C) _t And C ₀ The capacitance after the water absorption time t and the capacitance of the dry coating are respectively; epsilon _w Is the dielectric constant of water at the operating temperature.

According to certain embodiments of the present invention, the anionic resin includes one or more of an acrylic resin, a polyurethane acrylate (PUA), a polyurethane dispersion (PUD), and an epoxy resin. In a preferred embodiment of the present invention, the anionic resin is an acrylic resin, including but not limited to, neat acrylate polymers, styrene-acrylate polymers, silicone modified acrylate polymers, polyurethane modified acrylate polymers, or combinations thereof.

Preferably, the seal primer for woodware according to the embodiment of the invention can be used after being diluted by adding water accounting for 10-30 wt% of the total weight of the seal primer for woodware during construction. Thus, in one embodiment of the invention, the aqueous wood lacquer has a solids content of 20% by weight or more, preferably in the range of 25% to 40% by weight.

The primer sealer for woodware according to the embodiment of the present invention comprises 50 to 90% by weight of the aqueous latex of the anionic resin relative to the total weight of the primer sealer. More preferably, the aqueous latex of the anionic resin included in the woodware primer sealer may be in an amount of from about 50 wt%, about 55 wt%, about 60 wt%, about 65 wt% to about 70 wt%, about 80 wt%, about 90 wt%, based on the total weight of the woodware primer sealer.

The aqueous latex of the anionic resin disclosed above may be prepared by suitable emulsion polymerization methods well known to those of ordinary skill in the art, for example, by the following steps: the polymerizable monomers are dispersed in water into an emulsion under the action of suitable emulsifiers and/or dispersion stabilizers and with the aid of stirring, and the polymerization of the monomers is initiated, for example, by the addition of an initiator. Alternatively, any suitable commercially available product may be used as an example, such as CR3090 and CR7357 from Lubrizol, U.S. or Dow Roshield 530 from Dow, U.S. A.

The woodware primer sealer according to an embodiment of the invention includes a film-forming aid to assist in the film formation of the aqueous latex of the anionic resin. Suitable film forming aids include alcohols such as ethylene glycol, propylene glycol, hexylene glycol, benzyl alcohol, and the like; alcohol esters, such as dodecyl alcohol esters; alcohol ethers such as ethylene glycol butyl ether (BCS), propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol n-propyl ether, propylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol propyl ether, dipropylene glycol butyl ether (DPNB), tripropylene glycol n-butyl ether, and the like; alcohol ether esters, such as hexanediol butyl ether acetate; diester esters. As an example of a diester-based coalescent, coasol 290plus from Chemoxy, UK can be used.

In a preferred embodiment, the woodware primer sealer comprises from about 2 to about 10wt%, preferably from about 2 to about 8 wt%, of the film forming aid, relative to the total weight of the primer sealer. Specifically, the woodware primer sealer includes a film forming aid in an amount of from about 2 wt%, about 3wt%, about 4 wt%, about 5wt% to about 10wt%, about 9 wt%, or about 8 wt%, relative to the total weight of the primer sealer.

The woodware seal primer of embodiments of the present invention may further comprise one or more fillers. The term "filler" as used herein refers to any volume extender suitable for coatings, which may be organic or inorganic, for example in particulate form. The shape of the particles is not particularly limited and may have any suitable shape. The average particle size of the filler may vary over a wide range, for example, from about 10 nanometers to about 50 microns. Some fillers, in addition to functioning as volume extenders for the coating, impart one or more desired properties to the composition and/or to the coating formed from the composition. For example, some fillers may impart a desired color to the composition and the coating resulting from the composition. In this case, such fillers are also referred to as "pigments". Some fillers may improve chemical and/or physical properties, in particular may improve the mechanical properties of the coating obtained from the composition. In this case, such filler is also referred to as "reinforcing filler".

In embodiments of the present invention, suitable exemplary fillers include, for example, zinc stearate, china clay, wollastonite, barite, calcium carbonate, diatomaceous earth, talc, barium sulfate, magnesium aluminum silicate, silica, and any combination thereof. In a preferred embodiment, the filler is one or both of zinc stearate and talc.

In embodiments of the present invention, the woodware primer sealer may further comprise additional additives commonly used in woodware paints that do not adversely affect the coating composition or the cured coating resulting therefrom. Suitable additives include, for example, those agents that improve the processability or manufacturability of the composition, enhance the aesthetics of the composition, or improve specific functional properties or characteristics (such as adhesion to a substrate) of the coating composition or of a cured composition derived therefrom. Additives that may be included are, for example, carriers, emulsifiers, pigments, anti-migration aids, antimicrobial agents, chain extenders, lubricants, wetting agents, biocides, plasticizers, defoamers, colorants, waxes, antioxidants, corrosion inhibitors, flow control agents, thixotropic agents, dispersants, adhesion promoters, UV stabilizers, thickeners, defoamers, pH adjusters, or combinations thereof. The amount of each optional ingredient is sufficient to serve its intended purpose, but preferably such amount does not adversely affect the coating composition or the cured coating resulting therefrom. In a preferred embodiment of the present invention, suitable additional additives include thickeners, dispersants, defoamers, wetting agents, pH adjusters, preservatives, mildewcides, or any combination thereof.

Suitable thickeners include cellulose ether type thickeners, alkali swellable thickeners, polyurethane type thickeners, hydrophobically modified polyurethane type thickeners, or any combination thereof. All types of thickeners are commercially available. For example, as an example of the cellulose ether thickener, methyl hydroxyethyl cellulose ether thickener HMHEC Plus 330 available from Aqualon Company, usa may be used. As an example of the alkali-swellable thickener, TT935 from Rohm & Haas company of usa may be used.

In a preferred embodiment, the woodware primer sealer comprises from about 0.1 to about 2 wt%, preferably from about 0.4 to about 1.0 wt%, of thickener, relative to the total weight of the primer sealer. Specifically, the water borne woodware primer includes a thickener in an amount of from about 0.2 wt%, about 0.3 wt%, about 0.4 wt%, about 0.5 wt%, about 0.6 wt%, about 0.7 wt%, about 0.8 wt%, or about 0.9 wt% to about 2.0 wt%, about 1.5 wt% about 1.0 wt%, relative to the total weight of the primer.

Suitable dispersants may include anionic dispersants, cationic dispersants, nonionic dispersants, amphoteric dispersants, or any combination thereof. All types of dispersants are commercially available. In preferred embodiments, suitable dispersants include polyacrylate dispersants, polymethacrylate dispersants, polycarboxylate dispersants, or any combination thereof. As an example of the polyacrylate dispersant, sodium polyacrylate dispersant P30 available from the company alcema, france may be used.

In a preferred embodiment, the woodware primer sealer may comprise from about 0.1% to about 1.5%, preferably from about 0.2% to about 0.9% by weight of dispersant, relative to the total weight of the primer sealer. Specifically, the woodware primer sealer includes dispersant in an amount of from about 0.2 wt%, about 0.3 wt%, about 0.4 wt%, about 0.5 wt%, about 0.6 wt% to about 1.5 wt%, about 1.0 wt%, or about 0.9 wt%, relative to the total weight of the primer sealer.

Suitable defoamers include organosiloxane-based defoamers, grease-based defoamers, polyether-modified silicone-based defoamers, or any combination thereof. All types of defoamers are commercially available. As an example of an organosiloxane-based defoamer, BYK8820 from pick, germany may be used. As an example of the oil-based antifoaming agent, DF 6007 available from dongguande Feng may be used.

In a preferred embodiment, the woodware primer comprises from about 0.1% to about 1%, preferably from about 0.2% to about 0.8%, by weight of defoamer, relative to the total weight of the primer. Specifically, the wood sealer includes an amount of defoamer of from about 0.1wt%, about 0.2 wt%, 0.3 wt%, about 0.4 wt%, about 0.5 wt%, or about 0.6 wt% to about 1.0 wt%, about 0.9 wt%, or about 0.8 wt%, relative to the total weight of the sealer.

Suitable wetting agents include silicone based wetting agents, acetylenic diol based wetting agents, or combinations thereof. All types of wetting agents are commercially available. As an example of the silicone-based wetting agent, BYK 346 available from pick, germany may be used.

In a preferred embodiment, the woodware primer comprises from about 0.1% to about 2%, preferably from about 0.4% to about 1.0% by weight of wetting agent, relative to the total weight of the primer. Specifically, the water woodware primer sealer includes a wetting agent in an amount of from about 0.2 wt%, about 0.3 wt%, about 0.4 wt%, about 0.5 wt%, about 0.6 wt%, about 0.7 wt%, about 0.8 wt%, or about 0.9 wt% to about 2.0 wt%, about 1.5 wt% about 1.0 wt%, relative to the total weight of the primer sealer.

Suitable pH adjusting agents include anhydrous sodium carbonate, sodium hydroxide, potassium hydroxide, sodium bicarbonate, alcohol amines, ammonia, organic amines, or any combination thereof. In a preferred embodiment, the pH adjustor comprises aqueous ammonia, an organic amine, or a combination thereof.

In a preferred embodiment, the woodware primer sealer comprises from about 0.1 to about 1.0 wt%, preferably from about 0.1 to about 0.3 wt%, relative to the total weight of the primer sealer, of a pH adjusting agent. Specifically, the woodware primer sealer includes a pH adjuster in an amount of from about 0.1 wt.% or about 0.2 wt.% to about 1.0 wt.%, about 0.7 wt.%, about 0.5 wt.%, or about 0.3 wt.%, relative to the total weight of the primer sealer.

Suitable preservatives include isothiazolinones, benzimidazoles, substituted arenes, organic bromines, organic amines, piperacillins, or any combination thereof. All types of preservatives are commercially available. For example, as an example of an isothiazolinone preservative, kathon LX available from Dow, USA can be used. As an example of benzimidazole-based preservatives, rocima BT NV2 from dow, usa can be used.

In a preferred embodiment, the woodware primer sealer comprises from about 0.1 to about 1wt%, preferably from about 0.1 to about 0.5 wt%, relative to the total weight of the primer sealer, of a preservative. Specifically, the woodware primer sealer includes a preservative in an amount of from about 0.1wt%, 0.2 wt%, about 0.3 wt%, or about 0.4 wt% to about 1.0 wt%, about 0.9 wt%, about 0.7 wt%, or about 0.5 wt%, relative to the total weight of the primer sealer.

Suitable mildew inhibitors include isothiazolinones, benzimidazoles, iodopropargyls, substituted arenes, dithiocarbamates, carbendazim, diuron, or any combination thereof. All types of mildewcides are commercially available products. For example, as an example of a carbendazim-or diuron-based mildewcide, the Rocima 350 available from dow in the united states may be used. As an example of an isothiazolinone mold inhibitor, XARCIN AB available from Singapore PCTS specialty Chemicals, inc. can be used.

In a preferred embodiment, the woodware primer sealer comprises from about 0.1 to about 1wt%, preferably from about 0.1 to about 0.5 wt%, relative to the total weight of the primer sealer, of a mildew inhibitor. Specifically, the woodware primer sealer includes a mildewproof agent in an amount of from about 0.1wt%, 0.2 wt%, about 0.3 wt%, or about 0.4 wt% to about 1.0 wt%, about 0.9 wt%, about 0.7 wt%, or about 0.5 wt%, relative to the total weight of the primer sealer.

According to some embodiments of the present invention, the woodware primer sealer may further comprise any suitable aqueous medium. Suitable aqueous media include water-soluble organic solvents, water, and mixtures thereof.

In one embodiment, the woodware primer sealer of the present invention comprises, relative to the total weight of the primer sealer:

50 to 90 wt% of an aqueous latex of an anionic resin;

2 to 10 weight percent of a film forming aid;

0 to 8% by weight of a filler;

1 to 5wt% of an additional additive; and

0 to 30wt% of an aqueous medium;

wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 10%, the water absorption being measured and calculated according to a capacitance method; and is also provided with

Wherein the additional additive is selected from one or more of a thickener, a wetting agent, a defoamer, a dispersant, a pH regulator, a mildew inhibitor and a preservative.

In a specific embodiment, the woodware primer sealer of the present invention comprises, relative to the total weight of the primer sealer:

50 to 90% by weight of an aqueous latex of an acrylic resin;

0 to 0.9 wt% of a dispersant selected from polyacrylate dispersants;

0 to 30wt% of an aqueous medium, the aqueous medium being water;

wherein the film formed from the aqueous latex of the acrylic resin has a water absorption of at most 10%, preferably at most 8%, more preferably at most 6%, most preferably at most 4.5%, the water absorption being measured and calculated according to a capacitive method.

In the present invention, applicants have originally utilized the water absorption of films formed from anionic aqueous latex as tested and calculated by capacitance methods to establish a correlation between this water absorption and the sealing properties of the primer (e.g., sealing tannins), providing a new concept for the selection of film forming resins in woodware sealing primers, which has not been recognized before the present invention.

Without wishing to be bound by any theory, applicants believe that a significant degree of water absorption occurs immediately after the coating is exposed to an aqueous environment, as the water absorbed by the coating changes the dielectric properties of the material, and these changes can be monitored by Electrochemical Impedance Spectroscopy (EIS) and the water content in the coating determined. The prior art sealers generally need to be rated for water absorption according to the blushing resistance test and are required to meet the highest blushing resistance rating, but the test is visually inspected and the test results are relatively subjective. The applicant has unexpectedly found that anionic resins having a water absorption of at most 10%, preferably at most 8%, more preferably at most 6%, most preferably at most 4.5% as tested and calculated according to the capacitive method can be used as film forming resins for woodware sealers and provide excellent sealing properties.

The preparation of the primer sealer for woodware according to the embodiments of the present invention may be accomplished by any suitable mixing method known to those of ordinary skill in the art. For example, a woodware primer sealer can be made by: the aqueous latex of the anionic resin, the film-forming aid, the filler and the additives are added to the vessel, and the resulting mixture is stirred until homogeneous. Or the sealing primer for woodware can be prepared by the following steps: part of the additional additives is mixed with the filler and then the aqueous latex of the anionic resin, the film-forming aid and the remaining additional additives are added to form a homogeneous mixture. If desired, additional aqueous medium may be added during the preparation of the sealer.

Wooden product

In another aspect of the invention, there is provided a wood product comprising: a wood substrate having at least one major surface; and a primer sealer layer formed from the primer sealer for woodware according to the present invention coated on the main surface.

The primer sealer for woodware of the embodiment of the present invention may be applied by a conventional method known to those of ordinary skill in the art. Such coating methods include dip coating, spin coating, spray coating, curtain coating, brush coating, roll coating, and other coating methods known in the art. In one embodiment of the invention, the coating is performed using a spray process. In this way, a coating may be formed from the woodware primer sealer of the present invention, which also falls within the scope of the present invention. Thus, in another aspect of the present invention, there is provided a coating obtainable from the woodware primer sealer described herein. The primer sealer may be applied in a variety of primer sealer thicknesses. In an embodiment of the invention, the dry film thickness of the primer sealer layer is in the range of 15-50 microns, preferably in the range of 18-30 microns. The applied primer layer may be cured by air-drying it or by accelerating it using various drying means (e.g., ovens) familiar to those skilled in the art.

As the wood substrate for making the wood product of the present embodiment, any suitable wood substrate known in the art may be used. In this application, the term "wood substrate" refers to any cellulosic/lignin material derived from the hard, fibrous structure tissue in the stems and roots of trees or other woody plants. Wood includes, for example, hardwood and softwood wood cut directly from trees, as well as engineered wood composites made from wood strands, wood particles, wood fibers, or wood veneers. Examples of wood composite materials include, but are not limited to, plywood, oriented Strand Board (OSB), medium Density Fiberboard (MDF), particle board, and the like.

Preferably, the wood product of an embodiment of the present invention comprises a wood substrate having an acidic material comprising, by way of example, tannins, aldehydes and/or hemiacetals. In certain embodiments of the invention, the wood substrate has a tannin content of at least 0.1wt%, preferably at least 1wt%, more preferably at least 5wt%, yet more preferably at least 10wt%, and even more preferably 30wt%, as determined by CNS 4716-2005. As an exemplary wood substrate, one or more of quebracho, chestnut, oak, red chestnut, sasanqua, douglas fir, japanese cedar, american cypress, japanese red pine, japanese cypress, water walnut, black walnut, maple, japanese beech, japanese paulownia, birch, sallow, magnolia, ash, teak, oak, catalpa, oak, and oak may be used.

According to certain embodiments of the invention, the wood substrate has at least one, preferably two, main surfaces which are opposite to each other. As used herein, a "major surface" is a surface for decoration formed by the length and width dimensions of a wood substrate.

According to certain embodiments of the invention, the wood product may be prepared, for example, by: (1) providing a sanded wood substrate; (2) And sequentially coating and forming one or more sealing primer layers for woodware according to the embodiment of the invention on the wooden base material by using a coating and curing process so as to provide the wooden base material with required sealing performance.

According to certain embodiments of the present invention, the resulting wood product may be used in applications including, but not limited to: household furniture such as tables, chairs, cabinets, etc.; bedroom and bathroom furniture; office furniture; custom furniture, such as school and child furniture, hospital furniture, restaurant and hotel furniture, kitchen cabinets and furniture; a panel for indoor design; windows and doors both indoor and outdoor; window and door frames, both indoor and outdoor; outdoor and indoor siding and wood flooring.

The present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise stated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available and can be used directly without further processing.

Examples

Test method

Water absorption rate: taking a smooth and flat metal aluminum sheet as a metal substrate, and ultrasonically cleaning the aluminum sheet substrate by using acetone, ethanol and deionized water. Adding a proper amount of alcohol ether film forming auxiliary agent into the resin emulsion, coating a wet film with the thickness of 100 mu m on an aluminum sheet by using a wire rod, placing the wet film in an oven for baking for 24 hours, and standing at room temperature for 7 days to ensure that the paint film is completely dried. The dry film was placed at the bottom of an electrochemical test cell and sealed, and the test solution was 3wt% aqueous sodium chloride. The test adopts a three-electrode electrolytic cell which is composed of a platinum electrode as a counter electrode and a saturated calomel electrode as a reference electrode. The electrochemical impedance spectrum is measured and analyzed by adopting an electrochemical alternating current impedance test system,single frequency mode. The frequency range measured is 50 kHz-0.5 kH, and the amplitude of the alternating current is 15mV. The number of four cycles per frequency is collected to improve its signal to noise ratio. And analyzing data by using a Bode mode and a Nyquist mode in software, and calculating to obtain a capacitance value. The water absorption of the resin was calculated by the following formula:

Solid content: the amount of the remaining components measured after baking the sample in an atmospheric oven at 150℃for 1 hour was determined to determine the solid content.

Grindability of the polishing composition: the determination was carried out according to standard GB/T23999-2009. The grinding difficulty was observed, and the amount of powder and whether to stick sand paper were visually assessed on a scale of 1-5, where 5 is the best and 1 is the worst.

Closure of: the test is carried out by adopting a room temperature method or a thermal steaming method, wherein the room temperature method comprises the following steps: spraying the seal coat on a wood substrate, spraying white finish paint with the same thickness, standing for 1 day, 3 days and 7d at room temperature, and detecting delta b and delta E by using a color difference meter;

the thermal steaming method comprises the following steps: spraying sealing primer on the wooden substrate, spraying white finishing paint with the same thickness, covering wet rag on the finishing paint after the finishing paint is dried, and sealing and covering the finishing paint by using PE film. The mixture was placed in an oven at 50℃for one day, and the Δb and ΔE were measured by a color difference meter.

The closure was rated on a scale of 1-5, with 5 being the best and 1 being the worst.

Adhesion force: the scoring was done according to ASTM D3359, with 5B being the best and 0B being the worst, and rated according to a scale of 0B-5B.

Selection of anionic resin aqueous latex

Six different types (manufacturer or brand) of anionic acrylic resins were prepared, numbered 1-6, and the water absorption of films formed from the aqueous latices of these six resins were tested according to the test methods section and are reported in table 1.

TABLE 1

Resin 1

Resin 2

Resin 3

Resin 4

Resin 5

Resin 6

Water absorption rate

4.07％

2.65％

2.72％

55.91％

163.5％

10.23％

Three resins 1 to 3 having a water absorption of less than 10% were used in examples 1 to 3 of the following seal primers for woodware, respectively, and three resins 4 to 6 having a water absorption of more than 10% were used in comparative examples 1 to 3 of the following seal primers for woodware, respectively.

Preparation of seal primer for woodware

The components were mixed in the amounts shown in the following Table 2, thereby obtaining the seal primers for woodware of examples 1 to 3 and comparative examples 1 to 3.

The performance of the woodware primer sealer of examples 1-3 and comparative examples 1-3, including sanding, sealing and adhesion, was tested and the results are shown in Table 2.

TABLE 2

As can be seen from the results of table 2, the applicant has unexpectedly found that an anionic resin having a water absorption of at most 10%, preferably at most 8%, more preferably at most 6%, most preferably at most 4.5%, as measured and calculated by the capacitive method, can be used as a film forming resin for a woodware primer sealer, provides excellent sealing properties, and combines excellent sanding and adhesion, thus providing a new idea for selection of film forming resins in woodware primer sealer, which has not been recognized before the present invention.

While the invention has been described with reference to a number of embodiments and examples, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments can be devised which do not depart from the scope and spirit of the invention as disclosed herein.

Claims

1. A primer sealer for woodware comprising: an aqueous latex of an anionic resin, a film-forming aid, and additional additives, wherein the anionic resin comprises one or more of an acrylic resin, a polyurethane acrylate (PUA), a polyurethane dispersion (PUD), and an epoxy resin;

the primer sealer comprises, relative to the total weight of the primer sealer:

50 to 90 wt% of an aqueous latex of the anionic resin;

2 to 10 weight percent of the film forming aid;

0 to 8% by weight of a filler;

1 to 5wt% of the additional additive; and

0 to 30wt% of an aqueous medium;

wherein the additional additive is selected from one or more of a thickener, a wetting agent, a defoamer, a dispersant, a pH regulator, a mildew inhibitor and a preservative;

films formed from the aqueous latex of the anionic resin have a water absorption of up to 10%, which is measured according to the capacitive method and calculated by the following formula:

2. The woodware primer according to claim 1, wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 8%.

3. The woodware primer according to claim 1, wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 6%.

4. The woodware primer according to claim 1, wherein the film formed from the aqueous latex of the anionic resin has a water absorption of at most 4.5%.

5. The woodware primer according to any one of claims 1 to 4, wherein the acrylic resin is selected from the group consisting of neat acrylate polymer, styrene-acrylate polymer, silicone modified acrylate polymer, polyurethane modified acrylate polymer, or any combination thereof.

6. The woodware primer according to any one of claims 1 to 4, wherein the primer has a solids content of 25 to 40% by weight.

7. The woodware primer according to any one of claims 1 to 4, wherein the primer comprises, relative to the total weight of the primer:

50 to 90% by weight of an aqueous latex of an acrylic resin;

2 to 10 weight percent of the film forming aid selected from the group consisting of alcohol ethers and diesters;

0 to 8 weight percent of the filler selected from zinc stearate, talc, or combinations thereof;

0.4 to 1 weight percent of the thickener selected from the group consisting of cellulose ether based thickeners, alkali swellable thickeners, polyurethane based thickeners, or combinations thereof;

0 to 0.9 wt% of the dispersant selected from polyacrylate dispersants;

0.4 to 1 weight percent of the wetting agent selected from a silicone-based wetting agent, an acetylenic diol-based wetting agent, or a combination thereof;

0.2 to 0.8 wt% of said defoamer selected from the group consisting of organosiloxane defoamers, mineral oil defoamers, or combinations thereof;

0 to 0.3 wt% of the pH adjustor selected from the group consisting of aqueous ammonia, organic amines, or a combination thereof;

0 to 0.5 weight percent of the preservative selected from isothiazolinones, benzimidazoles, or any combination thereof;

0 to 0.5 wt% of the mildew inhibitor selected from isothiazolinones, iodopropargyls, carbendazim, diuron, or any combination thereof; and

0 to 30% by weight of an aqueous medium.

8. A wood product comprising:

a wood substrate having at least one major surface; and

a primer sealer layer formed from the woodware primer sealer of any one of claims 1-7 coated on the major surface.

9. A wood product according to claim 8, wherein the thickness of the closed primer layer is in the range of 18-30 microns.

10. A wood product according to claim 8 or 9, wherein the wood substrate has a tannin content of at least 0.1wt% as determined by standard CNS 4716-2005.

11. A wood product according to claim 8 or 9, wherein the wood substrate has a tannin content of at least 1wt% as determined by standard CNS 4716-2005.

12. A wood product according to claim 8 or 9, wherein the wood substrate has a tannin content of at least 5wt%, as determined by standard CNS 4716-2005.

13. A wood product according to claim 8 or 9, wherein the wood substrate has a tannin content of at least 10wt% as determined by standard CNS 4716-2005.

14. A wood product according to claim 8 or 9, wherein the wood substrate has a tannin content of at least 30wt% as determined by standard CNS 4716-2005.

15. A wood product according to claim 8 or 9, wherein the wood substrate is selected from one or more of the group consisting of quebracho, chestnut, oak, red chestnut, sasanqua, wood, douglas fir, japanese cedar, american cypress, japanese red pine, japanese cypress, maple, japanese beech, japanese paulownia, birch, salubrio, magnolia, white wax, teak, oak, catalpa, camphorwood, fir, walnut, oak and oak.

16. A wood product according to claim 8 or 9, wherein the wood substrate is selected from one or more of the group consisting of water walnut and black walnut.