阅读说明：本技术 一种节能装饰板及其制备方法 (Energy-saving decorative plate and preparation method thereof ) 是由 叶交友 徐伟达 章剑 沈娟霞 刘逸凡 赵建锋 孙文举 于 2021-09-13 设计创作，主要内容包括：本发明木材加工领域,特别涉及一种节能装饰板及其制备方法,本发明制备的装饰板节能环保,耐光色牢度高。本发明的装饰板包括装饰面层和设置在装饰面层下方的基板层,所述基板层为高耐光色牢度单板层,所述装饰面层厚度为1.2-1.5mm,所述装饰面层包括PVC表皮层；所述PVC表皮层中含有聚氯乙烯树脂粉和碳酸钙粉。节能装饰板的制备方法包括以下步骤：制备装饰面层：先制备PVC表皮层,然后在PVC表皮层上依次压贴彩膜层和透明皮层获得装饰面层；制备基板层；将所述装饰面层与基板层热压,然后再在所述透明皮层上涂布UV耐光漆。(The invention belongs to the field of wood processing, and particularly relates to an energy-saving decorative plate and a preparation method thereof. The decorative plate comprises a decorative surface layer and a substrate layer arranged below the decorative surface layer, wherein the substrate layer is a high light-fastness veneer layer, the thickness of the decorative surface layer is 1.2-1.5mm, and the decorative surface layer comprises a PVC surface layer; the PVC surface layer contains polyvinyl chloride resin powder and calcium carbonate powder. The preparation method of the energy-saving decorative plate comprises the following steps: preparing a decorative surface layer: firstly, preparing a PVC surface layer, and then sequentially pressing a color film layer and a transparent skin layer on the PVC surface layer to obtain a decorative surface layer; preparing a substrate layer; and hot-pressing the decorative surface layer and the substrate layer, and then coating UV light-resistant paint on the transparent surface layer.)

1. An energy-saving decorative plate is characterized by comprising a decorative surface layer and a substrate layer arranged below the decorative surface layer, wherein the substrate layer is a veneer layer with high light-fastness, the thickness of the decorative surface layer is 1.2-1.5mm, and the decorative surface layer comprises a PVC surface layer; the PVC surface layer contains polyvinyl chloride resin powder and calcium carbonate powder.

2. The preparation method of the energy-saving decorative plate is characterized by comprising the following steps of:

1) preparing a decorative surface layer: firstly, preparing a PVC surface layer, and then sequentially pressing a color film layer and a transparent skin layer on the PVC surface layer to obtain a decorative surface layer;

2) preparing a substrate layer;

3) and hot-pressing the decorative surface layer and the substrate layer, and then coating UV light-resistant paint on the transparent surface layer.

3. The method for preparing an energy-saving decorative board according to claim 2, wherein the method for preparing the high light fastness veneer layer comprises the following steps:

s1, cutting the log into decorative boards by rotary cutting or planing;

s2, performing acetylation modification treatment on the rotary-cut/sliced decorative plate obtained in the step S1;

s3, pretreating the acetylated and modified decorative board obtained in the step S2 before dyeing, and then primarily drying the acetylated and modified decorative board until the water content is 8-10%; then, dyeing by using a wood dyeing device, wherein the dyeing solution is water-based high light fastness dyeing solution;

s4, fixation and light fastness treatment: adopting ultraviolet absorber and light stabilizer to carry out light-resistant treatment on the decorative plate; specifically, the mass ratio of 1: 3-6 of titanium oxide and phenyl salicylate are uniformly mixed, ethanol with the mass being 20-30 times that of the titanium oxide is added and uniformly mixed to obtain a color fixing soaking solution, then the decorative plate treated in the step S3 is immersed in the color fixing soaking solution for 30-50 minutes, heated to 50-80 ℃ and kept for 15-20 minutes, naturally cooled, and taken out and dried until the water content is 6-8%;

and S5, processing the dyed decorative plate in the step S4 into a recombined decorative plate/material through the procedures of repairing, bionic assembly, gluing without aldehyde adhesive, gluing, curing and the like.

4. The method for preparing an energy-saving decorative plate according to claim 3, wherein the method comprises the following steps: the acetylation modification treatment method in the step S2 comprises the steps of diluting acetic anhydride by using a benzene solvent to obtain an acetic anhydride solution with the concentration of 20-30wt%, soaking the rotary-cut/sliced decorative board obtained in the step S1, reacting for 8-10h at the temperature of 145 ℃ under the pressure of 0.5-0.8MPa, discharging liquid after the reaction is finished, and vacuumizing to 500Pa under the pressure of 300-.

5. The method for preparing an energy-saving decorative plate according to claim 3, wherein the method comprises the following steps: the aldehyde-free adhesive in the step S5 is prepared by a hydroxymethylation lignin and melamine-urea resin blending technology, and the preparation method comprises the following steps:

s11, processing for 40-80min by adopting a ball milling method when the oscillation frequency is 10-50Hz to obtain lignin powder;

s12, performing addition reaction on the lignin powder to form hydroxymethylated lignin;

s13, uniformly mixing the hydroxymethylated lignin with MUF resin according to the proportion of 20-40wt% to prepare the aldehyde-free lignin-melamine urea-formaldehyde resin adhesive.

6. The method for preparing an energy-saving decorative plate according to claim 5, wherein the method comprises the following steps: and a first mixing system with the weight percentage of 5-8wt% is added during the mixing in the step S13, and the mass ratio of the first mixing system is 1: 2-4, and mixing the polyvinyl acetate emulsion and the mercaptoacetic glyceride mixture.

7. The method for preparing an energy-saving decorative plate according to claim 3, wherein the method comprises the following steps: the pretreatment before dyeing of step S3 includes

(1) Weighing anhydrous calcium chloride and acrylic acid according to the mass ratio of 1:5-8 to obtain a primary mixture, grinding stone needle powder until the particle size is 0.2-0.5 mm, and mixing the stone needle powder and the primary mixture according to the mass ratio of 1: 1-3, adding water with the mass 8-10 times of that of the primary mixture, stirring, and then sieving to remove filter residues to obtain a filtrate;

(2) placing the filter residue recovered in the step (1) in a hydrochloric acid solution according to the material liquid mass ratio of 1:4-5 for soaking at normal temperature, filtering and washing after soaking to obtain solid particles, drying the solid particles at the temperature of 100-950 ℃ for 1-2 hours, calcining the solid particles at the temperature of 850-950 ℃ for 1-2 hours, naturally cooling and grinding to obtain stone needle powder with a nano particle size;

(3) adding N-acylamino sodium carbonate accounting for 0.1-0.2% of the mass of the filtrate and stone needle powder accounting for 0.06-0.09% of the mass of the filtrate, which is prepared in the step (2), into the filtrate obtained in the step (1) to obtain a first soaking solution, stirring and dispersing uniformly, soaking the acetylated and modified decorative plate obtained in the step S2 into the first soaking solution for 10-15 minutes, pressurizing, heating, boiling for 20-30 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 8-10%, so that the water-based high-light-fastness dye solution can be used for dyeing.

8. The method for producing an energy-saving decorative panel according to any one of claims 2 to 7, wherein: the preparation method of the PVC skin layer comprises

S21, mixing the following raw materials: according to weight portion, comprises 80-90 portions of polyvinyl chloride resin powder, 180 portions of calcium carbonate 160-type materials, 10-30 portions of calcium titanate, 0.6-0.8 portion of internal lubricant, 1.0-1.2 portions of polyethylene wax, 2-4 portions of chlorinated polyethylene, 0.8-1.5 portions of acrylate, 0.6-0.9 portion of composite lubricant, 2-3 portions of liquid barium-zinc stabilizer and 1-3 portions of dioctyl phthalate;

s22, adding the raw materials into a high-speed stirrer to mix and heat, stirring at a low speed to cool, extruding by an internal mixer to prepare PVC particles, rolling by a hot roller for multiple times, cooling and cutting to form a PVC skin.

9. The method for preparing an energy-saving decorative board according to claim 8, wherein: the rolling temperature of the hot roller is 150-160 ℃.

10. The method for preparing an energy-saving decorative board according to claim 8, wherein: the internal lubricant is prepared from the following components in a mass ratio of 1: 1-4, wherein the composite lubricant is prepared by mixing polyethylene wax and stearic acid according to a mass ratio of 1: 2-5 mixed palmitic acid and pentaerythritol fatty acid esters.

Technical Field

The invention relates to the field of wood processing, in particular to an energy-saving decorative plate and a preparation method thereof.

Background

The decorative board is widely used in interior decoration, and compared with the traditional ceramic tiles, latex paint wall surfaces and the like, the decorative board is adopted to decorate the wall surface, so that the decorative board has a more novel decorative effect. The existing decorative plates are various in types and widely applied to places such as houses or meeting rooms. However, these locations have special complications compared to domestic decor panels, such as the need to prevent vandalism, the need for long service life, etc. The existing decorative plate has poor light fastness and short service life, and the energy-saving and environment-friendly properties need to be improved.

Disclosure of Invention

The invention aims to provide an energy-saving decorative plate with high light fastness and long service life.

The invention also aims to provide a preparation method of the energy-saving decorative plate.

The first technical purpose of the invention is realized by the following technical scheme:

an energy-saving decorative plate comprises a decorative surface layer and a substrate layer arranged below the decorative surface layer, wherein the substrate layer is a high light-fastness veneer layer, the thickness of the decorative surface layer is 1.2-1.5mm, and the decorative surface layer comprises a PVC surface layer; the PVC surface layer contains polyvinyl chloride resin powder and calcium carbonate powder.

The PVC surface layer in the energy-saving decorative plate uses the PVC resin powder and the calcium carbonate powder, so that waste materials can be changed into valuable materials, partial wood is saved, and the energy-saving decorative plate is energy-saving, green and environment-friendly.

Preferably, the performance parameters of the high light fastness veneer layer are as follows:

carrying out high yield and high yield cultivation under high yield and high yield;

total volatile organic compounds (72 h) is less than or equal to 0.50 mg/m²·h；

Water content: 4.0% -14.0%;

the color fastness to light is more than or equal to 4 levels of the gray card.

The second technical purpose of the invention is realized by the following technical scheme:

a preparation method of an energy-saving decorative plate comprises the following steps:

1) preparing a decorative surface layer: firstly, preparing a PVC surface layer, and then sequentially pressing a color film layer and a transparent skin layer on the PVC surface layer to obtain a decorative surface layer;

2) preparing a substrate layer;

3) and hot-pressing the decorative surface layer and the substrate layer, and then coating UV light-resistant paint on the transparent surface layer.

Preferably, the preparation method of the PVC skin layer comprises the following steps

S21, mixing the following raw materials: according to weight portion, comprises 80-90 portions of polyvinyl chloride resin powder, 180 portions of calcium carbonate 160-type materials, 10-30 portions of calcium titanate, 0.6-0.8 portion of internal lubricant, 1.0-1.2 portions of polyethylene wax, 2-4 portions of chlorinated polyethylene, 0.8-1.5 portions of acrylate, 0.6-0.9 portion of composite lubricant, 2-3 portions of liquid barium-zinc stabilizer and 1-3 portions of dioctyl phthalate;

s22, adding the raw materials into a high-speed stirrer to mix and heat, stirring at a low speed to cool, extruding by an internal mixer to prepare PVC particles, rolling by a hot roller for multiple times, cooling and cutting to form a PVC skin.

Preferably, the hot roll rolling temperature is 150-160 ℃.

Preferably, the internal lubricant is mixed according to a mass ratio of 1: 1-4, wherein the composite lubricant is prepared by mixing polyethylene wax and stearic acid according to a mass ratio of 1: 2-5 mixed palmitic acid and pentaerythritol fatty acid esters.

Preferably, the method for preparing the high light fastness veneer layer comprises the following steps:

s1, cutting the log into decorative boards by rotary cutting or planing;

s2, performing acetylation modification treatment on the rotary-cut/sliced decorative plate obtained in the step S1;

s3, pretreating the acetylated and modified decorative board obtained in the step S2 before dyeing, and then primarily drying the acetylated and modified decorative board until the water content is 8-10%; then, dyeing by using a wood dyeing device, wherein the dyeing solution is water-based high light fastness dyeing solution;

s4, fixation and light fastness treatment: adopting ultraviolet absorber and light stabilizer to carry out light-resistant treatment on the decorative plate; specifically, the mass ratio of 1: 3-6 of titanium oxide and phenyl salicylate are uniformly mixed, ethanol which accounts for 20-30 times of the mass of the titanium oxide is added and uniformly mixed to obtain a color fixing soaking solution, then the decorative plate treated in the step S3 is immersed in the color fixing soaking solution for 30-50 minutes, then the decorative plate is heated to 50-80 ℃ and kept for 15-20 minutes, the temperature is naturally reduced, and the decorative plate is taken out and dried until the water content is 6-8%;

and S5, processing the dyed decorative plate in the step S4 into a recombined decorative plate/material through the procedures of repairing, bionic assembly, gluing without aldehyde adhesive, gluing, curing and the like.

The recombined decorative board after pretreatment and high color fastness dyeing has the advantages that a guide pipe is permeated with a treatment liquid, the treatment liquid reacts with hydroxyl and sulfonic acid groups in a three-dimensional space net structure to modify cellulose of the decorative board, the dye liquid diffuses to an amorphous area inside fibers from outside to inside to achieve and maintain dynamic balance, the performances such as dye uptake, light resistance and the like are improved, meanwhile, through further color fixing and light resistance treatment, hydroxyl of cellulose fibers is dissociated to form hydroxyl anions, the hydroxyl anions and the dye liquid undergo chemical reactions such as nucleophilic substitution, nucleophilic addition and the like to generate firm covalent bonds between the fibers and the dye liquid, and therefore the excellent performances in terms of tinting strength and tolerance are achieved. The gray series recombined decorative board treated by the method has the color tone from light gray to dark gray, and the color after coloring is uniform and natural; the coloring penetration depth can reach 2-4mm, and the color fastness is high.

The light fastness of the invention is detected according to the national standard method of the veneer, and the requirement of high color fastness is met.

Preferably, the acetylation modification treatment method comprises diluting acetic anhydride with benzene solvent to obtain 20-30wt% acetic anhydride solution, soaking the rotary-cut/sliced decorative board obtained in step S1, reacting at 135-145 deg.C under 0.5-0.8MPa for 8-10h, discharging liquid, and vacuumizing to 300-500Pa after the reaction is finished.

The invention combines the wood fading mechanism to perform acetylation modification on wood, and can improve the stability of radicals.

Preferably, the adhesive is prepared by a hydroxymethylation lignin and melamine-urea resin blending technology, and the preparation method comprises the following steps:

s11, processing for 40-80min by adopting a ball milling method when the oscillation frequency is 10-50Hz to obtain lignin powder;

s12, performing addition reaction on the lignin powder to form hydroxymethylated lignin;

s13, uniformly mixing the hydroxymethylated lignin with MUF resin according to the proportion of 20-40wt% to prepare the aldehyde-free lignin-melamine urea-formaldehyde resin adhesive.

The adhesive disclosed by the invention is green and environment-friendly, is beneficial to forming a uniform and stable adhesive system, improves the adhesive bonding capability and adhesive bonding stability of the adhesive, and is beneficial to eliminating stress and improving the adhesive bonding performance of a recombined decorative plate; meanwhile, the color fastness of the recombined decorative board can be further improved through addition reaction.

Preferably, a first mixing system in an amount of 5-8wt% is further added during the mixing in the step S13, and the first mixing system is a mixture of 1: 2-4, and mixing the polyvinyl acetate emulsion and the mercaptoacetic glyceride mixture.

The first mixed system has a synergistic toughening effect, has a good toughening effect on the urea-formaldehyde resin adhesive, overcomes the defects that a cutter is damaged when a product is sliced and the sliced product is easy to crack because the adhesive layer is hard after the cold-set urea-formaldehyde resin is cured, and manufactures a recombined decorative material product with better performance.

Preferably, the pre-dyeing pretreatment comprises

(1) Weighing anhydrous calcium chloride and acrylic acid according to the mass ratio of 1:5-8 to obtain a primary mixture, grinding stone needle powder until the particle size is 0.2-0.5 mm, and mixing the stone needle powder and the primary mixture according to the mass ratio of 1: 1-3, adding water with the mass 8-10 times of that of the primary mixture, stirring, and then sieving to remove filter residues to obtain a filtrate;

(2) placing the filter residue recovered in the step (1) in a hydrochloric acid solution according to the material liquid mass ratio of 1:4-5 for soaking at normal temperature, filtering and washing after soaking to obtain solid particles, drying the solid particles at the temperature of 100-950 ℃ for 1-2 hours, calcining the solid particles at the temperature of 850-950 ℃ for 1-2 hours, naturally cooling and grinding to obtain stone needle powder with a nano particle size;

(3) adding N-acylamino sodium carbonate accounting for 0.1-0.2% of the mass of the filtrate and stone needle powder accounting for 0.06-0.09% of the mass of the filtrate, which is prepared in the step (2), into the filtrate obtained in the step (1) to obtain a first soaking solution, stirring and dispersing uniformly, soaking the acetylated and modified decorative plate obtained in the step S2 into the first soaking solution for 10-15 minutes, pressurizing, heating, boiling for 20-30 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 8-10%, so that the water-based high-light-fastness dye solution can be used for dyeing.

The decorative plate subjected to acetylation modification obtained in the step S2 is treated and modified, the prepared nano stone needle powder particles with large specific surface area and capable of emitting infrared rays after being heated are added, the generated surface energy efficiency enables the nano stone needle powder particles to be fully combined with a decorative plate substrate, the activity of the reaction of hydroxyl in cellulose, hemicellulose and lignin in the decorative plate and an aqueous dye with high light fastness can be improved, the stability after dyeing is also improved, the toughness, the thermal stability and the size stability of the decorative plate are remarkably improved after pressure cooking treatment, and then dyeing is carried out, so that the problem that the existing dye is poor in decorative plate dyeing, particularly gray series dyeing is solved.

Preferably, the aqueous dye solution with high light fastness is a gray system of chlorine-s-triazine and vinyl sulfone reactive dyes; the reactive dye is also added with a composite regulator, and the composite regulator is prepared from the following components in a mass ratio of 1: 2-5 of tetraethoxysilane and silane coupling agent.

The composite regulator can improve the connection between the dye and the wood, the wood fiber and the active dye generate chemical reaction to generate ether bond to fix the active dye on the wood, and the composite regulator has extremely large specific surface area and higher specific surface energy, so that an oxide film with a three-dimensional network structure is easily formed on the surface of the wood, the active dye is three-dimensionally fixed in a siloxane matrix by the oxide film, and the effect of improving the dyeing and color fixing rate of the dyed wood is achieved.

More preferably, the silane coupling agent is one or more of vinyltriethoxysilane, vinyltrimethoxysilane and vinyltris (beta-methoxyethoxy) silane.

In conclusion, the invention has the following beneficial effects:

1. the wood is acetylated and modified by combining a wood fading mechanism, so that the stability of groups is improved; a specific aqueous dye solution with high light fastness is adopted, according to a dye-uptake mechanism, a composite regulator is preferably selected to improve the connection between the dye and the wood, and then color fixation and light fastness treatment is adopted to further improve the light fastness;

2. the high-temperature and high-pressure dyeing process is adopted, so that the dyeing temperature and the dyeing pressure are improved, on one hand, the high-color-fastness dye with poor permeability can be immersed into the decorative plate, on the other hand, the dyeing time can be obviously shortened, and the efficiency is improved;

3. the recombined decorative board after pretreatment and high color fastness dyeing has the advantages that a guide pipe is permeated with a treatment liquid, the treatment liquid reacts with hydroxyl and sulfonic acid groups in a three-dimensional space net structure to modify cellulose of the decorative board, the dye liquid diffuses to an amorphous area inside fibers from outside to inside to achieve and maintain dynamic balance, the performances such as dye uptake, light resistance and the like are improved, meanwhile, through further color fixing and light resistance treatment, hydroxyl of cellulose fibers is dissociated to form hydroxyl anions, the hydroxyl anions and the dye liquid undergo chemical reactions such as nucleophilic substitution, nucleophilic addition and the like to generate firm covalent bonds between the fibers and the dye liquid, and therefore the excellent performances in terms of tinting strength and tolerance are achieved. The gray series recombined decorative board treated by the method has the color tone from light gray to dark gray, and the color after coloring is uniform and natural; the coloring penetration depth can reach 2-4mm, and the color fastness is high; the service life is long;

4. the water-based high-color-fastness dye solution is used for replacing common dyes, so that the light color fastness grade of the recombined decorative material is more than or equal to the 4-grade gray card, and other indexes meet the standard requirements of GB/T28999-.

Detailed Description

Example 1

A preparation method of an energy-saving decorative plate comprises the following steps:

1) preparing a decorative surface layer: firstly, preparing a PVC surface layer, and then sequentially pressing a color film layer and a transparent skin layer on the PVC surface layer to obtain a decorative surface layer;

2) preparing a substrate layer;

3) and hot-pressing the decorative surface layer and the substrate layer, and then coating UV light-resistant paint on the transparent surface layer.

The preparation method of the PVC skin layer comprises

S21, mixing the following raw materials: according to the weight portion, the composite lubricant comprises 80 parts of polyvinyl chloride resin powder, 160 parts of calcium carbonate, 10 parts of calcium titanate, 0.6 part of internal lubricant, 1.0 part of polyethylene wax, 2 parts of chlorinated polyethylene, 0.8 part of acrylate, 0.6 part of composite lubricant, 2 parts of liquid barium-zinc stabilizer and 3 parts of dioctyl phthalate;

wherein, the internal lubricant is prepared from the following components in a mass ratio of 1: 1, the composite lubricant is prepared by mixing polyethylene wax and stearic acid according to a mass ratio of 1: 2 palmitic acid and pentaerythritol fatty acid esters;

s22, adding the raw materials into a high-speed stirrer to mix and heat, stirring at a low speed to cool, extruding by an internal mixer to prepare PVC particles, rolling by a hot roller for multiple times, cooling and cutting to form a PVC skin, wherein the rolling temperature of the hot roller is 150 ℃.

The preparation method of the veneer layer with high light fastness comprises the following steps:

s1, cutting the log into decorative boards by rotary cutting or planing;

s2, performing acetylation modification treatment on the rotary-cut/sliced decorative plate obtained in the step S1; the acetylation modification treatment method comprises diluting acetic anhydride with benzene solvent to obtain acetic anhydride solution with acetic anhydride concentration of 20wt%, soaking the rotary-cut/sliced decorative board obtained in step S1, reacting at 135 deg.C under 0.5MPa for 8 hr, discharging liquid, and vacuumizing to 300 Pa;

s3, pretreating the acetylated and modified decorative board obtained in the step S2 before dyeing, and then primarily drying the acetylated and modified decorative board until the water content is 8%; then, dyeing by using a high-color-fastness wood dyeing device, wherein the dye solution adopts a water-based high-light-fastness dye solution;

the aqueous dye liquor with high light fastness is a gray system of chloro-s-triazine and vinyl sulfone reactive dyes; the reactive dye is also added with a composite regulator, and the mass ratio of the composite regulator is 1: 2, mixing tetraethoxysilane and silane coupling agent;

the silane coupling agent is vinyl triethoxysilane;

s4, fixation and light fastness treatment: adopting ultraviolet absorber and light stabilizer to carry out light-resistant treatment on the decorative plate; specifically, the mass ratio of 1:3, uniformly mixing the titanium oxide and the phenyl salicylate, adding ethanol which accounts for 20 times of the mass of the titanium oxide, uniformly mixing to obtain a color fixing soaking solution, immersing the decorative plate treated in the step S3 in the color fixing soaking solution for 30 minutes, heating to 50 ℃, keeping for 15 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 6%;

s5, processing the dyed decorative plate in the step S4 into a recombined decorative plate/material through the procedures of repairing, bionic assembly, gluing without aldehyde adhesive, gluing, curing and the like;

the aldehyde-free adhesive is prepared by hydroxymethylation lignin and melamine-urea resin blending technology, and the preparation method comprises the following steps:

s11, processing for 40min by adopting a ball milling method when the oscillation frequency is 10Hz to obtain lignin powder;

s12, performing addition reaction on the lignin powder to form hydroxymethylated lignin;

s13, uniformly mixing the hydroxymethylated lignin with MUF resin according to the proportion of 20wt% to prepare the aldehyde-free lignin-melamine urea-formaldehyde resin adhesive.

Example 2

A preparation method of an energy-saving decorative plate comprises the following steps:

1) preparing a decorative surface layer: firstly, preparing a PVC surface layer, and then sequentially pressing a color film layer and a transparent skin layer on the PVC surface layer to obtain a decorative surface layer;

2) preparing a substrate layer;

3) and hot-pressing the decorative surface layer and the substrate layer, and then coating UV light-resistant paint on the transparent surface layer.

The preparation method of the PVC skin layer comprises

S21, mixing the following raw materials: according to the weight portion, the composite lubricant comprises 90 portions of polyvinyl chloride resin powder, 180 portions of calcium carbonate, 30 portions of calcium titanate, 0.8 portion of internal lubricant, 1.2 portions of polyethylene wax, 4 portions of chlorinated polyethylene, 1.5 portions of acrylate, 0.9 portion of composite lubricant, 3 portions of liquid barium-zinc stabilizer and 3 portions of dioctyl phthalate;

wherein, the internal lubricant is prepared from the following components in a mass ratio of 1:4, the composite lubricant is prepared by mixing polyethylene wax and stearic acid according to a mass ratio of 1:5 palmitic acid and pentaerythritol fatty acid esters;

s22, adding the raw materials into a high-speed stirrer to mix and heat, stirring at a low speed to cool, extruding by an internal mixer to prepare PVC particles, rolling by a hot roller for multiple times, cooling and cutting to form a PVC skin, wherein the rolling temperature of the hot roller is 160 ℃.

The preparation method of the veneer layer with high light fastness comprises the following steps:

s1, cutting the log into decorative boards by rotary cutting or planing;

s2, performing acetylation modification treatment on the rotary-cut/sliced decorative plate obtained in the step S1; the acetylation modification treatment method comprises diluting acetic anhydride with benzene solvent to obtain 30wt% acetic anhydride solution, soaking the rotary-cut/sliced decorative board obtained in step S1, reacting at 145 deg.C under 0.8MPa for 10 hr, discharging liquid, and vacuumizing to 500 Pa;

s3, pretreating the acetylated and modified decorative board obtained in the step S2 before dyeing, and then primarily drying the acetylated and modified decorative board until the water content is 10%; then, dyeing by using a high-color-fastness wood dyeing device, wherein the dye solution adopts a water-based high-light-fastness dye solution;

the aqueous dye liquor with high light fastness is a gray system of chloro-s-triazine and vinyl sulfone reactive dyes; the reactive dye is also added with a composite regulator, and the mass ratio of the composite regulator is 1:5, mixing tetraethoxysilane and silane coupling agent; the silane coupling agent is vinyl trimethoxy silane;

s4, fixation and light fastness treatment: adopting ultraviolet absorber and light stabilizer to carry out light-resistant treatment on the decorative plate; specifically, the mass ratio of 1:6, uniformly mixing titanium oxide and phenyl salicylate, adding ethanol with the mass being 30 times that of the titanium oxide, uniformly mixing to obtain a color fixing soaking solution, immersing the decorative plate treated in the step S3 in the color fixing soaking solution for 50 minutes, heating to 80 ℃, keeping for 20 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 8%;

s5, processing the dyed decorative plate in the step S4 into a recombined decorative plate/material through the procedures of repairing, bionic assembly, gluing without aldehyde adhesive, gluing, curing and the like;

the aldehyde-free adhesive is prepared by hydroxymethylation lignin and melamine-urea resin blending technology, and the preparation method comprises the following steps:

s11, processing for 80min by adopting a ball milling method when the oscillation frequency is 50Hz to obtain lignin powder;

s12, performing addition reaction on the lignin powder to form hydroxymethylated lignin;

s13, uniformly mixing hydroxymethylated lignin with MUF resin according to the proportion of 40wt% to prepare the aldehyde-free lignin-melamine urea-formaldehyde resin adhesive.

Example 3

A preparation method of an energy-saving decorative plate comprises the following steps:

1) preparing a decorative surface layer: firstly, preparing a PVC surface layer, and then sequentially pressing a color film layer and a transparent skin layer on the PVC surface layer to obtain a decorative surface layer;

2) preparing a substrate layer;

3) and hot-pressing the decorative surface layer and the substrate layer, and then coating UV light-resistant paint on the transparent surface layer.

The preparation method of the PVC skin layer comprises

S21, mixing the following raw materials: according to the weight portion, the composite material comprises 80-90 portions of polyvinyl chloride resin powder, 170 portions of calcium carbonate, 20 portions of calcium titanate, 0.7 portion of internal lubricant, 1.1 portions of polyethylene wax, 3 portions of chlorinated polyethylene, 1.3 portions of acrylate, 0.8 portion of composite lubricant, 2.5 portions of liquid barium-zinc stabilizer and 2 portions of dioctyl phthalate;

the internal lubricant is polyethylene wax and stearic acid which are mixed according to the mass ratio of 1:3, and the composite lubricant is palmitic acid and pentaerythritol fatty acid ester which are mixed according to the mass ratio of 1: 4;

s22, adding the raw materials into a high-speed stirrer to mix and heat, stirring at a low speed to cool, extruding by an internal mixer to prepare PVC particles, rolling by a hot roller for multiple times, cooling and cutting to form a PVC skin, wherein the rolling temperature of the hot roller is 155 ℃.

The preparation method of the veneer layer with high light fastness comprises the following steps:

s1, cutting the log into decorative boards by rotary cutting or planing;

s2, performing acetylation modification treatment on the rotary-cut/sliced decorative plate obtained in the step S1; the acetylation modification treatment method comprises diluting acetic anhydride with benzene solvent to obtain 25wt% acetic anhydride solution, soaking the rotary-cut/sliced decorative board obtained in step S1, reacting at 140 deg.C under 0.6MPa for 9 hr, discharging liquid, and vacuumizing to 400 Pa;

s3, pretreating the acetylated and modified decorative board obtained in the step S2 before dyeing, and then primarily drying the acetylated and modified decorative board until the water content is 9%; then, dyeing by using a high-color-fastness wood dyeing device, wherein the dye solution adopts a water-based high-light-fastness dye solution;

the aqueous dye liquor with high light fastness is a gray system of chloro-s-triazine and vinyl sulfone reactive dyes; the reactive dye is also added with a composite regulator, and the mass ratio of the composite regulator is 1:4, mixing tetraethoxysilane and silane coupling agent; the silane coupling agent is vinyl tri (beta-methoxy ethoxy) silane.

S4, fixation and light fastness treatment: adopting ultraviolet absorber and light stabilizer to carry out light-resistant treatment on the decorative plate; specifically, the mass ratio of 1:5, uniformly mixing titanium oxide and phenyl salicylate, adding ethanol accounting for 25 times of the mass of the titanium oxide, uniformly mixing to obtain a color fixing soaking solution, immersing the decorative plate treated in the step S3 in the color fixing soaking solution for 40 minutes, heating to 60 ℃, keeping for 18 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 7%;

s5, processing the dyed decorative plate in the step S4 into a recombined decorative plate/material through the procedures of repairing, bionic assembly, gluing without aldehyde adhesive, gluing, curing and the like;

the aldehyde-free adhesive is prepared by hydroxymethylation lignin and melamine-urea resin blending technology, and the preparation method comprises the following steps:

s11, processing for 60min by adopting a ball milling method when the oscillation frequency is 30Hz to obtain lignin powder;

s12, performing addition reaction on the lignin powder to form hydroxymethylated lignin;

s13, uniformly mixing hydroxymethylated lignin with MUF resin according to the proportion of 30wt% to prepare the aldehyde-free lignin-melamine urea-formaldehyde resin adhesive.

Example 4

The same as example 1, except that 6wt% of a first mixing system is added during the mixing in the step S13, and the mass ratio of the first mixing system is 1:3 mixing the polyvinyl acetate emulsion and the mercaptoacetic glyceride mixture.

Example 5

The same as example 1, except that 5wt% of a first mixing system is added during the mixing in the step S13, and the mass ratio of the first mixing system is 1: 2 mixing the polyvinyl acetate emulsion and the mercaptoacetic glyceride mixture.

Example 6

The same as example 1, except that 8wt% of a first mixing system is added during the mixing in the step S13, and the mass ratio of the first mixing system is 1:4 mixing the polyvinyl acetate emulsion and the mercaptoacetic glyceride mixture.

Example 7

The same as example 4, except that the pretreatment before dyeing in step S3 includes

(1) Weighing anhydrous calcium chloride and acrylic acid according to the mass ratio of 1:5 to obtain a primary mixture, grinding stone needle powder until the particle size is 0.2 mm, and mixing the stone needle powder and the primary mixture according to the mass ratio of 1: 1, uniformly mixing, adding water with the mass being 8 times that of the primary mixture, stirring, and then sieving to remove filter residues to obtain a filtrate;

(2) placing the filter residue recovered in the step (1) in a hydrochloric acid solution according to the feed liquid mass ratio of 1:4 for soaking at normal temperature, filtering and washing after soaking to obtain solid particles, drying the solid particles at the temperature of 100 ℃ for 1 hour, calcining the solid particles at the temperature of 850 ℃ for 1 hour, naturally cooling and grinding to obtain the stone needle powder with the nano particle size;

(3) adding N-acylamino sodium carbonate accounting for 0.1% of the mass of the filtrate and stone needle powder accounting for 0.06% of the mass of the filtrate, which is prepared in the step (2), into the filtrate obtained in the step (1), uniformly stirring and dispersing to obtain a first soaking solution, soaking the acetylated and modified decorative plate obtained in the step S2 in the first soaking solution for 10 minutes, pressurizing, heating, boiling for 20 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 8%, thus dyeing by using the aqueous high light fastness dye solution.

Example 8

The same as example 5, except that the pretreatment before dyeing in step S3 includes

(1) Weighing anhydrous calcium chloride and acrylic acid according to the mass ratio of 1:8 to obtain a primary mixture, grinding stone needle powder until the particle size is 0.5 mm, and mixing the stone needle powder and the primary mixture according to the mass ratio of 1:3, uniformly mixing, adding water with the mass being 10 times that of the primary mixture, stirring, and then sieving to remove filter residues to obtain a filtrate;

(2) placing the filter residue recovered in the step (1) in a hydrochloric acid solution according to the feed liquid mass ratio of 1:5 for soaking at normal temperature, filtering and washing after soaking to obtain solid particles, drying the solid particles at 120 ℃ for 2 hours, calcining the solid particles at 950 ℃ for 2 hours, naturally cooling and grinding to obtain the stone needle powder with the nano particle size;

(3) adding N-acylamino sodium carbonate accounting for 0.2% of the mass of the filtrate and stone needle powder accounting for 0.09% of the mass of the filtrate, which is prepared in the step (2), into the filtrate obtained in the step (1) to obtain a first soaking solution, stirring and dispersing uniformly, soaking the acetylated and modified decorative plate obtained in the step S2 in the first soaking solution for 15 minutes, pressurizing, heating, boiling for 30 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 10%, thus dyeing by using the aqueous high-light-fastness dye solution.

Example 9

The same as example 6, except that the pretreatment before dyeing in step S3 includes

(1) Weighing anhydrous calcium chloride and acrylic acid according to the mass ratio of 1:6 to obtain a primary mixture, grinding stone needle powder until the particle size is 0.4 mm, and mixing the stone needle powder and the primary mixture according to the mass ratio of 1: 2, uniformly mixing, adding water with the mass being 9 times that of the primary mixture, stirring, and then sieving to remove filter residues to obtain a filtrate;

(2) placing the filter residue recovered in the step (1) in a hydrochloric acid solution according to the feed liquid mass ratio of 1:4.5 for soaking at normal temperature, filtering and washing after soaking to obtain solid particles, drying the solid particles at the temperature of 110 ℃ for 1-2 hours, calcining the solid particles at the temperature of 900 ℃ for 1.5 hours, naturally cooling, and grinding to obtain the stone needle powder with the nano particle size;

(3) adding N-acylamino sodium carbonate accounting for 0.15% of the mass of the filtrate and stone needle powder accounting for 0.08% of the mass of the filtrate, which is prepared in the step (2), into the filtrate obtained in the step (1) to obtain a first soaking solution, stirring and dispersing uniformly, soaking the acetylated and modified decorative plate obtained in the step S2 in the first soaking solution for 12 minutes, pressurizing, heating, boiling for 25 minutes, naturally cooling, taking out the decorative plate, and drying until the water content is 9%, thus dyeing by using the aqueous high-light-fastness dye solution.

Comparative example 1

The same as example 1, except that step S2 was omitted and the acetylation modification treatment was not performed.

Comparative example 2

The same as example 2, except that the pretreatment before dyeing is not performed in step S3, and the dyeing is performed after the primary drying is directly performed after the acetylation modification.

Comparative example 3

The same as example 3, except that step S4 was omitted and no specific fixation and light fastness treatment was carried out.

Comparative example 4

The same as example 4, except that the color fixing soaking solution in the color fixing and light-resisting treatment of step S4 does not contain titanium oxide, and the aldehyde-free adhesive of the present invention is not used in the gluing of step S5.

Detection experiment: and performing physical and chemical detection according to the light color fastness, formaldehyde release amount, dipping stripping parameters, static bending strength and elastic modulus of GB/T28999-.

The above data show that:

1. the color fastness level of the energy-saving decorative plate prepared in the examples 1 to 9 is high and is superior to that of the recombined decorative plate prepared in the comparative examples 1 to 4;

2. the energy-saving decorative boards prepared in examples 1 to 9 have small formaldehyde emission, small dip peeling length of each side of each glue layer, and larger static bending strength and elastic modulus, and are superior to the performance of the recombined decorative boards in comparative examples 1 to 4;

3. the color fastness grade of the energy-saving decorative plate prepared by the examples 4-6 is higher than that of the recombined decorative plate prepared by the examples 1-3; the color fastness grades of the energy-saving decorative boards prepared in the examples 7 to 9 are superior to the color fastness of the recombined decorative boards in the examples 4 to 6; the adhesive, the pretreatment before dyeing and the structure of the high-color-fastness wood dyeing device influence the color fastness and also influence the formaldehyde emission, the dipping stripping parameter, the static bending strength and the elastic modulus of the decorative plate.

In summary, compared with the comparative examples 1 to 4, the energy-saving decorative boards prepared in the examples 1 to 9 of the present invention have the advantages of good color fastness to light, small formaldehyde emission, high dipping stripping parameters, high static bending strength and elastic modulus, and long service life.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.