CN113134879A - Fragrance-releasing decorative artificial board and preparation method thereof - Google Patents

Fragrance-releasing decorative artificial board and preparation method thereof Download PDF

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Publication number
CN113134879A
CN113134879A CN202110422872.7A CN202110422872A CN113134879A CN 113134879 A CN113134879 A CN 113134879A CN 202110422872 A CN202110422872 A CN 202110422872A CN 113134879 A CN113134879 A CN 113134879A
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Prior art keywords
essence
preparation
fragrance
artificial board
adhesive
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CN202110422872.7A
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Chinese (zh)
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CN113134879B (en
Inventor
徐建峰
龙玲
刘如
唐召群
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Research Institute of Wood Industry of Chinese Academy of Forestry
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Research Institute of Wood Industry of Chinese Academy of Forestry
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/06—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/28—Multiple coating on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/028—Paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention claims a fragrance-releasing type decorative artificial board and a preparation method thereof, wherein the fragrance-releasing type decorative artificial board comprises the following steps: the decorative base paper is completely dipped in the formaldehyde-free adhesive for 20-40s and dried at 80-100 ℃, and the gluing amount of the dry glue is 30-50% of the base paper ration based on no redundant glue solution and no hand sticking on the paper surface. After drying, sizing by adopting a mode of separating surface coating and back coating, wherein the back adhesive is an aldehyde-free adhesive, and the total sizing amount is 20-50% of the base paper weight; the surface glue is an aldehyde-free adhesive added with essence slow-release microcapsules, and adopts a mode of coating ultrathin coatings for multiple times, the thickness of each dry coating is 0.5-1 mu m, and the total gluing amount of the surface glue is 20% -30% of the base paper ration. Completely drying at 90-100 deg.C. Hot pressing the impregnated bond paper on the formaldehyde-free artificial board for 4-6min under the pressure of 4-6Mpa and the temperature of 90-140 ℃. The fragrance-releasing type veneer artificial board prepared by the method has the effects of no formaldehyde, fragrance release and guarantee of the requirement of the physical strength of the veneer.

Description

Fragrance-releasing decorative artificial board and preparation method thereof
Technical Field
The invention relates to a fragrance-releasing type facing artificial board and a preparation method thereof, belonging to the technical field of artificial board processing.
Background
With the improvement of the living standard and environmental awareness of people and the concern of society on the air quality of the room environment, people begin to pay attention to the odor problem of home decoration wood materials and products thereof. The artificial board is a main material of interior decoration and furniture, generally emits odor, and the problem of indoor odor is more serious along with the gradual increase of the home decoration degree and the furniture holding amount. According to market research, indoor decoration and furniture enterprises suffering customer complaints for odor reasons are up to 1% and are in an increasing trend in recent years. The fragrance often brings a pleasant mood because many perfumes themselves can not only inhibit the growth and development of bacteria in the surrounding environment, but also some can regulate the mental and emotional state of a person, such as lavender perfume, which can relieve stress and tension and irritative mood, calm the nerves, and increase sleep. The development of artificial board with fragrance-releasing function is an important means for solving the problem of indoor odor, and the fragrance of artificial board with fragrance-releasing function is generally realized by adding perfume.
Perfuming directly in the plate making process by using perfume, and obtaining a finished plate after high temperature and high pressure, wherein the fragrance is released too fast and too thick initially, so that the fragrance of the finished plate is almost lost after several days (chlorphenamine maleate, forestry science and technology development, vol.27 in 2013, page 5, 108-111); in addition, the base material and the adhesive in the artificial board release other odors, so that partial fragrance is masked, and the effect of adding the perfume to the base material of the artificial board is poor. In order to improve the aesthetic property and the function of the artificial board products, most of the artificial board products need to be faced by materials such as coating, decorative paper, PVC, PP, cork and the like, and adding spice into the facing material at the outermost layer is a better way of adding spice, but the way also has the problem of too fast fragrance release, or the fragrance is difficult to release due to the coating of a polymer film formed by the coating, an adhesive and the like. And most of the facing materials have odor, and the adhesives used when the facing materials are adhered to the artificial boards also have more or less odor release, which can partially or even completely cover the odor of the perfume. Therefore, it is necessary to prepare a fragrance-releasing type artificial veneer which can release fragrance for a long time and is not influenced by the fragrance.
In order to realize the slow release of the fragrance, the mode of preparing the essence microcapsules is mostly considered to realize the slow release of the fragrance, but if the carrier of the microcapsules is not properly selected or the adding mode is not proper, the fragrance release effect is greatly reduced. Patent ZL202010394895.7 reports an aldehyde-free impregnating adhesive for decorative paper and a preparation method thereof, each component of the adhesive does not contain free formaldehyde, the product does not release free formaldehyde, and is free from peculiar smell, and meanwhile, the molecular weight of the adhesive is small, the sealing property of the formed adhesive film is not strong, and the release of fragrance is facilitated. The artificial board facing paper is impregnated by the adhesive, so that the fragrance is efficiently and slowly released, and is not influenced by other odors. Meanwhile, in the hot pressing process, the structure of the microcapsule can be directly damaged by overhigh temperature, so that the slow release effect is lost, the hot pressing temperature is lowered, the hot pressing time is prolonged moderately to realize hot pressing, and the microcapsule is protected from being damaged.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, provides a preparation method of the impregnation adhesive for decorative paper containing essence slow-release microcapsules, provides a gluing process suitable for the impregnation adhesive, and realizes preparation of the fragrance-releasing type facing artificial board.
The fragrance releasing type facing artificial board and the preparation method thereof comprise the following steps: the decorative base paper is completely dipped in the formaldehyde-free adhesive for 20-40s and dried at 80-100 ℃, and the gluing amount of the dry glue is 30-50% of the base paper ration based on no redundant glue solution and no hand sticking on the paper surface. After drying, sizing by adopting a mode of separating surface coating and back coating, wherein the back adhesive is an aldehyde-free adhesive, and the total sizing amount is 20-50% of the base paper weight; the surface glue is an aldehyde-free adhesive added with essence slow-release microcapsules, and adopts a mode of coating ultrathin coatings for multiple times, the thickness of each dry coating is 0.5-1 mu m, and the total gluing amount of the surface glue is 20% -30% of the base paper ration. Completely drying at 90-100 deg.C. Hot pressing the impregnated bond paper on the formaldehyde-free artificial board for 4-6min under the pressure of 4-6Mpa and the temperature of 90-140 ℃, thus obtaining the fragrance-releasing type decorative artificial board.
Further, the aldehyde-free adhesive is an adhesive reported in patent ZL 202010394895.7;
furthermore, the addition amount of the essence slow-release microcapsule is 0.1 to 3 percent;
further, the essence slow-release microcapsule is characterized by comprising the following raw materials in percentage by mass:
20-40% of essence;
15-30% of Arabic gum;
10-25% of maltodextrin;
the balance being deionized water.
Specifically, the essence is one or more of flower essence, fruit essence, costustoot essence, grass essence, aldehyde essence and international essence;
the preparation method of the essence slow-release microcapsule is characterized by comprising the following steps:
1) weighing the raw materials according to the mass percentage;
2) putting deionized water into a container, heating in a constant-temperature water bath, sequentially adding arabic gum and maltodextrin into the container, and stirring to fully dissolve the arabic gum and the maltodextrin to obtain a wall material;
3) adding essence into the wall material which is stirred uniformly, stirring to fully dissolve the essence, and shearing at high speed by a high-pressure homogenizer to form oil-in-water emulsion;
4) and (4) carrying out spray drying on the oil-in-water type emulsion to obtain the essence microcapsule.
Preferably, the temperature of the thermostatic water bath in the step 2) is 30-80 ℃.
Preferably, the speed of the high-speed homogenizer in the step 3) is 8000-.
Preferably, the process parameters of the spray drying in the step 4) are as follows: the feeding speed is 5-40ml/min, the air inlet temperature is 150-.
The relevant physical properties of the impregnated decorative paper are tested according to the national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
The invention has the following advantages:
1) the prepared slow-release microcapsule and the coating carrier (the surface coating liquid of the decorative base paper) thereof do not generate aldehyde substances such as formaldehyde and the like in the preparation and processing processes, free formaldehyde is not released, and the fragrance-releasing decorative paper is an aldehyde-free product.
2) The fragrance-carrying microcapsules are dispersed in the adhesive reported in patent ZL202010394895.7, the adhesive is small in particle size, small in molecular weight and moderate in viscosity, so that the impregnating adhesive can well penetrate into paper, the sealing performance of the formed adhesive film is not very compact, fragrance is favorably released, and the surface bonding strength of the decorative veneer of the fragrance-releasing decorative paper is also ensured. The adhesive has no peculiar smell and cannot cover up the fragrance.
3) Only the surface layer of the decorative base paper is coated with the glue solution dispersed with the slow-release microcapsule of the spice, so that the utilization rate of the spice can be realized to the maximum extent; the mode of coating the ultrathin coating for multiple times can improve the addition of the spice and ensure the physical strength of the veneer, such as wear resistance and the like; the lower hot-pressing temperature is used for decorating the aroma-releasing decorative paper, so that the 'rupture' of the slow-release microcapsules loaded with the spices in the hot-pressing process is reduced to the maximum extent, and the effect of protecting the microcapsules is achieved.
Example 1:
1) placing 40 parts of deionized water in a container, heating in a constant-temperature water bath, sequentially adding 30 parts of Arabic gum and 10 parts of maltodextrin in the container, and stirring to fully dissolve the Arabic gum and the maltodextrin to obtain a wall material;
3) adding 20 parts of floral essence into the uniformly stirred wall material, stirring to fully dissolve the floral essence, and shearing at a high speed by a high-pressure homogenizer to form an oil-in-water emulsion; the speed of the high-speed homogenizer is 8000/min, the shearing time is 15 minutes, and the homogenizing pressure is 1000 bar.
4) And (3) carrying out spray drying on the oil-in-water emulsion, wherein the feeding speed is 5/min, the air inlet temperature is 190 ℃, and the air outlet temperature is 90 ℃. Thus obtaining the rose essence-starch-based microcapsule.
5) The decorative base paper is completely dipped in the aldehyde-free adhesive reported in patent ZL202010394895.7 for 20s and dried at 80 ℃, and the gluing amount of the dry glue is 30 percent of the base paper weight on the basis that no excess glue solution and no hand sticking exist on the paper surface. After drying, sizing by adopting a mode of separating surface coating and back coating, wherein the back adhesive is an aldehyde-free adhesive, and the total sizing amount is 50 percent of the base paper weight; the surface glue is an aldehyde-free adhesive added with 0.1% of essence slow-release microcapsules, and adopts a mode of coating ultrathin coatings for many times, the thickness of each dry coating is 0.5 mu m, and the total gluing amount of the surface glue is 20% of the base paper ration. Complete drying was carried out at 90 ℃. And hot-pressing the impregnated bond paper on the formaldehyde-free artificial board for 4min at the pressure of 6Mpa and the temperature of 90 ℃ to obtain the fragrance-releasing decorative artificial board.
The relevant physical properties of the impregnated decorative paper are tested according to the national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
Example 2:
1) placing 20 parts of deionized water in a container, heating in a constant-temperature water bath, sequentially adding 20 parts of Arabic gum and 20 parts of maltodextrin into the container, and stirring to fully dissolve the Arabic gum and the maltodextrin to obtain a wall material;
3) adding 40 parts of floral essence into the wall material which is stirred uniformly, stirring to fully dissolve the floral essence, and shearing at a high speed by a high-pressure homogenizer to form an oil-in-water emulsion; the speed of the high-speed homogenizer was 15000/min, the shearing time was 1 minute and the homogenizing pressure was 1200 bar.
4) And (3) carrying out spray drying on the oil-in-water emulsion, wherein the feeding rate is 40/min, the air inlet temperature is 150 ℃, and the air outlet temperature is 70 ℃. Thus obtaining the rose essence-starch-based microcapsule.
5) The decorative base paper is completely dipped in the aldehyde-free adhesive reported in patent ZL202010394895.7 for 40s and dried at 100 ℃, and the gluing amount of the dry glue is 50 percent of the base paper weight on the basis that no excess glue solution and no hand sticking exist on the paper surface. After drying, sizing by adopting a mode of separating surface coating and back coating, wherein the back adhesive is an aldehyde-free adhesive, and the total sizing amount is 20 percent of the base paper weight; the surface glue is an aldehyde-free adhesive added with 3% of essence slow-release microcapsules, and adopts a mode of coating ultrathin coatings for many times, the thickness of each dry coating is 1 mu m, and the total gluing amount of the surface glue is 30% of the base paper ration. Complete drying was carried out at 100 ℃. And hot-pressing the impregnated bond paper on the formaldehyde-free artificial board for 6min at the pressure of 4Mpa and the temperature of 140 ℃ to obtain the fragrance-releasing decorative artificial board.
The relevant physical properties of the impregnated decorative paper are tested according to the national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
Example 3:
1) placing 20 parts of deionized water in a container, heating in a constant-temperature water bath, sequentially adding 30 parts of Arabic gum and 20 parts of maltodextrin in the container, and stirring to fully dissolve the Arabic gum and the maltodextrin to obtain a wall material;
3) adding 30 parts of floral essence into the uniformly stirred wall material, stirring to fully dissolve the floral essence, and shearing at a high speed by a high-pressure homogenizer to form an oil-in-water emulsion; the speed of the high speed homogenizer is 10000/min, the shearing time is 10 minutes, and the homogenizing pressure is 800 bar.
4) And (3) carrying out spray drying on the oil-in-water emulsion, wherein the feeding speed is 20/min, the air inlet temperature is 160 ℃, and the air outlet temperature is 80 ℃. Thus obtaining the rose essence-starch-based microcapsule.
5) The decorative base paper is completely dipped in the aldehyde-free adhesive reported in patent ZL202010394895.7 for 30s and dried at 90 ℃, and the gluing amount of the dry glue is 40 percent of the base paper weight on the basis that no excess glue solution and no hand sticking exist on the paper surface. After drying, sizing by adopting a mode of separating surface coating and back coating, wherein the back adhesive is an aldehyde-free adhesive, and the total sizing amount is 30 percent of the base paper weight; the surface glue is an aldehyde-free adhesive added with 1% of essence slow-release microcapsules, and adopts a mode of coating ultrathin coatings for multiple times, the thickness of each dry coating is 0.75 mu m, and the total gluing amount of the surface glue is 30% of the base paper ration. Complete drying was carried out at 95 ℃. And hot-pressing the impregnated bond paper on the formaldehyde-free artificial board for 5min at the pressure of 5Mpa and the temperature of 130 ℃ to obtain the fragrance-releasing decorative artificial board.
The relevant physical properties of the impregnated decorative paper are tested according to the national standards GB/T28995 and 2012, GB/T15102 and 2017 and GB/T17657 and 2013.
Comparative example 1:
the difference from the technical scheme of the embodiment 1 is only that the mode of coating the essence-containing slow-release capsule glue solution is one-time coating. The addition amount of the essence microcapsules and the glue amount of the surface glue are the same as those in the example 1.
TABLE 1 comparison of properties of artificial veneer with fragrance releasing
Figure BSA0000239874990000041
The test is according to national standard: GB/T28995-2012, GB/T17657-2013, GB/T15102-2017
Compared with the published fragrance-releasing artificial board, the fragrance-releasing decorative artificial board prepared by the invention has no free formaldehyde release and longer fragrance-releasing time, and the surface bonding strength and the wear resistance of the veneer can meet the requirements of related national standards. The non-compact film-forming aldehyde-free adhesive is used as a carrier of the essence slow-release capsule, so that the veneer is free of aldehyde, and the fragrance is released; the mode of coating the ultrathin coating for many times effectively ensures the utilization efficiency of the essence microcapsules.

Claims (10)

1. The preparation method of the fragrance-releasing decorative artificial board is characterized by comprising the following steps: the decorative base paper is completely dipped in the formaldehyde-free adhesive for 20-40s and dried at 80-100 ℃, and the gluing amount of the dry glue is 30-50% of the base paper ration based on no redundant glue solution and no hand sticking on the paper surface. After drying, sizing by adopting a mode of separating surface coating and back coating, wherein the back adhesive is an aldehyde-free adhesive, and the total sizing amount is 20-50% of the base paper weight; the surface glue is an aldehyde-free adhesive added with essence slow-release microcapsules, and adopts a mode of coating ultrathin coatings for multiple times, the thickness of each dry coating is 0.5-1 mu m, and the total gluing amount of the surface glue is 20% -30% of the base paper ration. Completely drying at 90-100 deg.C. Hot pressing the impregnated bond paper on the formaldehyde-free artificial board for 4-6min under the pressure of 4-6Mpa and the temperature of 90-140 ℃, thus obtaining the fragrance-releasing type decorative artificial board.
2. The preparation method according to claim 1, wherein the essence slow-release microcapsule comprises the following raw materials in percentage by mass:
20-40% of essence;
15-30% of Arabic gum;
10-25% of maltodextrin;
the balance being deionized water.
3. The preparation method according to claim 2, wherein the essence is one or more of floral essence, fruit essence, costustoot essence, grass essence, aldehyde essence and international essence.
4. The preparation method according to claim 1, wherein the addition amount of the essence sustained-release microcapsule is 0.1% -3%.
5. The preparation method according to claim 1, wherein the preparation method of the essence sustained-release microcapsule comprises the following steps:
1) weighing the raw materials according to the mass percentage;
2) putting deionized water into a container, heating in a constant-temperature water bath, sequentially adding arabic gum and maltodextrin into the container, and stirring to fully dissolve the arabic gum and the maltodextrin to obtain a wall material;
3) adding essence into the wall material which is stirred uniformly, stirring to fully dissolve the essence, and shearing at high speed by a high-pressure homogenizer to form oil-in-water emulsion; 4) and (4) carrying out spray drying on the oil-in-water type emulsion to obtain the essence microcapsule.
6. The preparation method according to claim 5, wherein the temperature of the thermostatic waterbath in the step 2) is 30-80 ℃.
7. The method as claimed in claim 5, wherein the speed of the high speed homogenizer in step 3) is 8000-15000r/min, the shearing time is 1-15 minutes, and the homogenizing pressure is 500-1200 bar.
8. The preparation method according to claim 5, wherein the spray drying in the step 4) has the following process parameters: the feeding speed is 5-40ml/min, the air inlet temperature is 150-.
9. The preparation method of claim 1, wherein the formaldehyde-free impregnating adhesive comprises the following components in parts by weight:
aqueous polyurethane emulsion: 30-50 parts of
Nano-cellulose: 1-5 parts of
Filling: 5-10 parts of
Water: 200 portions and 300 portions.
Specifically, the nano-cellulose is dialdehyde modified nano-cellulose, the solid content is 0.5-3%, and the particle size is 20-50 nm. As a filler dispersant, the filler can be uniformly and stably present in the aqueous polyurethane emulsion. The structure of the dialdehyde modified nano-cellulose is as follows:
Figure FSA0000239874980000011
specifically, the filler is a titanium dioxide suspension with the particle size of 50-200nm, and the mass fraction is about 20%; silicon dioxide suspension with the particle size of 50-100nm, the mass fraction is about 10%; 50-100nm zinc dioxide suspension with the mass fraction of about 10%; alumina suspension with the grain diameter of 50-200nm, and the mass fraction of the alumina suspension is about 10 percent or the combination of a plurality of alumina suspensions. The function of the paper is to improve the hanging amount of the impregnated bond paper and the scratch resistance and wear resistance of the adhesive film.
Specifically, the formula of the aqueous polyurethane emulsion comprises the following components: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-2, the molar part of the dihydric alcohol is 20-40, the chain extender is 3-8, the hydrophilic agent is 5-10, the glacial acetic acid is 0.1-1 and the water is 50-80.
More specifically, the dihydric alcohol comprises one or more of polyester dihydric alcohol and polyether dihydric alcohol which do not contain aliphatic rings or aromatic rings. The diisocyanate comprises one or more of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI) and Lysine Diisocyanate (LDI). The chain extender is one of ethylene glycol, propylene glycol, 1, 4-butanediol, diethylene glycol and 1, 4-cyclohexanediol. The hydrophilic agent is N-Methyldiethanolamine (MDEA).
The preparation method of the waterborne polyurethane emulsion comprises the following steps:
1) adding dihydric alcohol and diisocyanate into a reaction kettle with a stirring and refluxing device according to a certain proportion, and carrying out prepolymerization reaction under the protection of high-purity nitrogen at the reaction temperature of 40-60 ℃ for 0.5-1h to obtain the polyurethane prepolymer.
2) Heating the prepolymer to 65-80 ℃, dropwise adding a chain extender into the prepolymer for 10-20min, carrying out chain extension reaction for 0.5-1.5h, and stirring at a speed of 50-100 r/min. Then cooling to 40-60 ℃, adding the hydrophilic agent, and finishing the addition within 30min, wherein the reaction time is 0.5-1.5 h.
3) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity and shearing at high speed, wherein the shearing speed is 2000-; the solid content of the emulsion is about 20 percent, the particle diameter is 50-100nm, the viscosity is 50-100cp, and the molecular weight is 500-2000-.
According to the formula proportion, the nano-cellulose is put into water and the aqueous polyurethane emulsion at room temperature, and stirred for 5-10min at the speed of 500-; and then adjusting the stirring speed to 1000-3000r/min, simultaneously adding a filler, continuously stirring for 10-20min, and standing to obtain the aldehyde-free adhesive for the impregnated adhesive film paper.
10. The release-type veneer artificial board prepared according to the preparation method of any one of claims 1 to 9.
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