Powder coating coated fiberboard and production method thereof

Abstract

The invention provides a powder coating coated fiberboard and a production method thereof, and belongs to the technical field of high-density fiberboard processing, a powder coating is coated on a stem and leaf rubbing layer and has natural and nontoxic plant stem and leaf rubbing patterns, fluidized bed electrostatic coating is adopted, the fiberboard does not need to be preheated, the requirement for the surface condition of the fiberboard is low, and the production cost is low. The method is simple and convenient to operate and suitable for fiberboard assembly line work, mordanting conductive liquid is adopted for activating treatment, fiberboards have certain conductivity, stem and leaf rubbing is not affected, and plant stem and leaf rubbing colors are enhanced and stabilized; in the aspect of color associative property, the rubbed plant stem and leaf patterns enable people to have a sense of feeling in vision, people can associate vigor, prosperity and green ecological fiberboard visual effect through the surface of the fiberboard and the plant stem and leaf patterns, the patterns are clearer and more vivid, and additional synthetic dyes are not needed.

Description

Technical Field

[0001] The invention belongs to the technical field of high-density fiberboard processing, in particular to a production method of a fiberboard coated with powder coating. Background Art

[0002] Use electrostatic spraying equipment to spray powder coating onto the surface of the workpiece. The powder coating is uniformly adsorbed on the surface of the workpiece under the action of static electricity to form a powder coating. After high-temperature baking, leveling and curing, the powder coating electrostatic spraying process finally obtains a final coating with different effects, and different types of powder coatings can achieve different effects. High-temperature treatment in the production process of powder coating electrostatic spraying helps to reduce the release of formaldehyde and VOCs remaining in the board. However, due to the uniform coating of powder coating balls, the color is a single color, and it is impossible to form a pattern, and the content is too monotonous and boring. At present, people use the method of artists painting patterns on the single-color powder coating coating, but the painted pictures have the disadvantages of easy falling off and easy oxidation. It requires professionals to regularly repair, reinforce and color, and the process is complicated and costly, which is not suitable for ordinary users. Therefore, the singleness of color pattern limits the further promotion and application of powder coating fiberboard. The green and environmentally friendly interior design concept also puts forward new requirements for the appearance of fiberboard green building materials. Those skilled in the art are in urgent need of developing a production method for powder coating fiberboard to meet the existing use needs and performance requirements. Summary of the invention

[0003] In view of the above problems, the present invention aims to provide a powder coating fiberboard and a production method thereof.

[0004] The present invention is achieved through the following technical solutions: A powder coating fiberboard comprises a high-density fiberboard base, a stem and leaf rubbing layer and a powder coating layer; the stem and leaf rubbing layer is on the high-density fiberboard base, and the powder coating layer is on the stem and leaf rubbing layer; the production method of the powder coating fiberboard comprises the following steps: the first step is to perform surface activation treatment on the fiberboard with a mordant conductive liquid, and then air-dry it in a constant temperature and humidity environment until the surface moisture content is 11% to 12%, so as to obtain a pre-treated high-density fiberboard; the second step is to lay a waterproof plastic film flat under the high-density fiberboard, place plant stems and leaves on the high-density fiberboard, roll the high-density fiberboard with a warp beam or roll it together with the waterproof plastic film under it and fix it with a cable tie to obtain a high-density fiberboard roll wrapped on the warp beam; the high-density fiberboard roll is placed in a steam kettle at 105 to 110°C and steamed for 10 to 16 minutes to perform stem and leaf rubbing; Plant stems and leaves have natural pigments that can create rich and varied patterns and textures during the stem and leaf rubbing process, giving the fabric a unique plant imprint and giving the fiberboard a unique color and tone. Steaming in a steam kettle allows the pigments of the plant stems and leaves to penetrate the fiberboard.

[0005] The fiberboard with stem and leaf rubbing patterns on one side is obtained by rolling it up together with the waterproof plastic film underneath and fixing it with cable ties. The waterproof plastic film prevents rubbing on the other side. The fiberboard with stem and leaf rubbing patterns on both sides is obtained by simply rolling up the high-density fiberboard.

[0006] The third step: use fluidized bed electrostatic spraying process to spray transparent powder coating onto the high-density fiberboard after stem and leaf rubbing, and after curing, the powder coating coated fiberboard is obtained.

[0007] Furthermore, the plant stems and leaves are one of the following: Alocasia scabra stems and leaves, Isatis indigotica stems and leaves, and Ramie stems and leaves.

[0008] Peristrophebaphica (Spreng) Bremek. Also known as Nine-headed Lion Grass.

[0009] Indigofera cusia (Nees) Kuntze, also known as Indigofera cusia.

[0010] Furthermore, the fluidized bed electrostatic spraying process has an operating voltage of 40-50 kV, a current of 10-20 μA, a fluidized bed gas pressure of 0.03-0.05 MPa, a ripple voltage coefficient of 1%-2%, an electric field strength of 1-1.5 kV / cm, and a distance between the high-density fiberboard and the electrode of 20-30 cm.

[0011] Furthermore, the curing temperature of the third step is 115-130° C., and the curing time is 4-6 minutes.

[0012] Furthermore, the powder coating in the third step is a transparent polyester powder coating or a transparent acrylic powder coating, and the particle size of the powder coating is 20 to 50 μm.

[0013] Furthermore, the density of the high-density fiberboard is 0.91-0.93 g / cm 3 1~1.35mm thick high-density fiberboard. High-density fiberboard is thin and has high density, so it can be bent and rolled.

[0014] Furthermore, the first step of mordant conductive liquid is a water dispersion of plant ash liquid or alum liquid dispersed in water with a mass fraction of 2% to 4%. Plant ash and alum can improve the conductivity of fiberboard and facilitate coating.

[0015] Furthermore, the first step of activation treatment is to add mordant conductive liquid at a rate of 10 to 15 g / m 2 Spray onto high-density fiberboard surface.

[0016] Beneficial effects of the present invention: At present, there is no powder coating fiberboard with plant stem and leaf rubbings or fiberboard products and related technologies with plant stem and leaf rubbings on the market. The powder coating fiberboard includes a high-density fiberboard base, a stem and leaf rubbing layer and a powder coating layer; the stem and leaf rubbing layer is on the high-density fiberboard base, and the powder coating layer is on the stem and leaf rubbing layer, and has a natural, non-toxic plant stem and leaf rubbing pattern. The production method of the powder coating high-density fiberboard is disclosed, the high-density fiberboard is coated with powder coating, and the fluidized bed electrostatic coating is used, and the fiberboard is not The preheating requirement is low and the surface condition of the fiberboard is low. The operation is simple and convenient. It is suitable for fiberboard assembly line operations. The mordant conductive liquid is used for activation treatment to make the fiberboard have a certain conductivity without affecting the stem and leaf rubbings, and the color of the plant stem and leaf rubbings is enhanced and stabilized. In terms of color association, the plant stem and leaf patterns after rubbing make people's vision synesthetic. The surface of the fiberboard and the plant stem and leaf patterns remind people of vitality and prosperity, and experience the green ecological visual effect of the fiberboard. The pattern is clearer and realistic, and no additional synthetic dyes are required. DETAILED DESCRIPTION

[0017] The present invention is described below with specific examples, but is not intended to be limiting of the present invention. Example

[0018] Raw material: Shanghai Qian 1mm YMNFCR fiberboard, density 0.91g / cm 3 ; Moisture content 8.2%; Static bending strength 34.8MPa; Elastic modulus 3.69MPa, the third step powder coating is transparent polyester powder coating PW-CLS901, the powder coating particle size is 20μm. The mordant conductive liquid is Mengcheng Lvyang biological plant ash liquid, the plant ash liquid is a water dispersion with a mass fraction of 2% dispersed in water. Lixing Gongdian Town Wangdian Isatis indigo plant stems and leaves.

[0019] The production method of fiberboard coated with powder coating comprises the following steps: the first step is to use mordant conductive liquid to activate the fiberboard surface, the activation treatment is to add mordant conductive liquid at 15g / m 2Spray it onto the surface of the high-density fiberboard, and then air-dry it in a constant temperature and humidity environment until the surface moisture content is 12%, to obtain the pretreated high-density fiberboard; the second step is to lay the waterproof plastic film flat under the high-density fiberboard, place the plant stems and leaves on the high-density fiberboard, roll the high-density fiberboard with a warp axis and fix it with a cable tie to obtain a high-density fiberboard roll wrapped on the warp axis, and the waterproof plastic film is not rolled; the high-density fiberboard roll is placed in a 110℃ steam kettle and steamed for 16 minutes to perform stem and leaf rubbing; the third step is to use a fluidized bed electrostatic spraying process to spray the transparent powder coating onto On the high-density fiberboard after stem and leaf rubbing, the working voltage is 50kV, the current is 20μA, the fluidized bed pressure is 0.05MPa, the ripple voltage coefficient is 2%, the electric field strength is 1.5kV / cm, the distance between the high-density fiberboard and the electrode is 30cm, and after curing, the curing temperature is 130℃, and the curing time is 6min, to obtain a powder coating coated fiberboard. The powder coating coated fiberboard includes a high-density fiberboard base layer, a stem and leaf rubbing layer and a powder coating coating; the stem and leaf rubbing layer is on the high-density fiberboard base layer, and the powder coating coating is on the stem and leaf rubbing layer.

[0020] Product: Hardness 2H, adhesion level 2; impact resistance impact height 50cm; liquid resistance level 3; moisture and heat resistance level 3; dry heat resistance level 3, the upper and lower surfaces of the fiberboard have clear indigo stem and leaf patterns. Example 1

[0021] Shanghai Qian 1mm YMNFCR fiberboard, density 0.92g / cm 3 ; Moisture content 8.2%; Static bending strength 33.8MPa; Elastic modulus 3.63MPa, the third step powder coating is transparent acrylic powder coating A-CLS901, the powder coating particle size is 50μm. The mordant conductive liquid is Jiahe Xuri alum liquid, alum is dispersed in water with a mass fraction of 4% aqueous dispersion. Tongling Tianmen Moshan round-leaf green ramie stems and leaves.

[0022] The production method of fiberboard coated with powder coating comprises the following steps: the first step is to use mordant conductive liquid to activate the fiberboard surface, the activation treatment is to use the mordant conductive liquid at a rate of 12g / m 2Spray it onto the surface of the high-density fiberboard, and then air-dry it in a constant temperature and humidity environment until the surface moisture content is 11%, thereby obtaining the pretreated high-density fiberboard; the second step is to lay the waterproof plastic film flat under the high-density fiberboard, place the plant stems and leaves on the high-density fiberboard, roll up the high-density fiberboard together with the waterproof plastic film under it with a warp axis, and then fix it with a cable tie to obtain a high-density fiberboard roll wrapped around the warp axis; place the high-density fiberboard roll in a 108℃ steam kettle for 12 minutes, and perform stem and leaf rubbing; the third step is to use a fluidized bed electrostatic spraying process to spray the transparent powder coating onto On the high-density fiberboard after stem and leaf rubbing, the working voltage is 45kV, the current is 15μA, the fluidized bed air pressure is 0.04MPa, the ripple voltage coefficient is 1.5%, the electric field strength is 1.2kV / cm, the distance between the high-density fiberboard and the electrode is 25cm, and after curing, the curing temperature is 120℃, and the curing time is 5min, to obtain the powder coating coated fiberboard. The powder coating coated fiberboard includes a high-density fiberboard base layer, a stem and leaf rubbing layer and a powder coating coating; the stem and leaf rubbing layer is on the high-density fiberboard base layer, and the powder coating coating is on the stem and leaf rubbing layer.

[0023] Product: Hardness 2H, adhesion level 2; impact resistance impact height 50cm; liquid resistance level 3; moisture and heat resistance level 3; dry heat resistance level 3, the upper surface of the fiberboard has a clear green stem and leaf pattern. Example 2

[0024] Raw materials: moisture content 6.7%, static bending strength 48.2MPa; Shanghai Qian 1.35mm YMNFCR fiberboard, density 0.93g / cm 3 The powder coating in the third step is acrylic powder coating A-CLS901, and the particle size of the powder coating is 50 μm. The mordant conductive liquid is a 2% aqueous dispersion dispersed in water. The plant stems and leaves are the stems and leaves of the nine-headed lion grass (Guanyin grass) from Dashishan, Huoqiu.

[0025] The production method of fiberboard coated with powder coating comprises the following steps: the first step is to use mordant conductive liquid to activate the fiberboard surface, the activation treatment is to add mordant conductive liquid at a rate of 10g / m 2Spray it onto the surface of the high-density fiberboard, and then air-dry it in a constant temperature and humidity environment until the surface moisture content is 11%, thereby obtaining the pretreated high-density fiberboard; the second step is to lay the waterproof plastic film flat under the high-density fiberboard, place the plant stems and leaves on the high-density fiberboard, roll up the high-density fiberboard together with the waterproof plastic film under it with a warp axis, and then fix it with a cable tie to obtain a high-density fiberboard roll wrapped on the warp axis; place the high-density fiberboard roll in a 105℃ steam kettle for 10 minutes, and perform stem and leaf rubbing; the third step is to use a fluidized bed electrostatic spraying process to spray the transparent powder coating Apply it to the high-density fiberboard after stem and leaf rubbing, with an operating voltage of 40kV, a current of 10μA, a fluidized bed pressure of 0.03MPa, a ripple voltage coefficient of 1%, an electric field strength of 1kV / cm, and a distance of 20cm between the high-density fiberboard and the electrode. After curing, the curing temperature is 115°C and the curing time is 4min to obtain a powder coating coated fiberboard. The powder coating coated fiberboard includes a high-density fiberboard base layer, a stem and leaf rubbing layer and a powder coating coating; the stem and leaf rubbing layer is on the high-density fiberboard base layer, and the powder coating coating is on the stem and leaf rubbing layer.

[0026] Product: Hardness 2H, adhesion level 2; impact resistance impact height 50cm; liquid resistance level 3; moisture and heat resistance level 3; dry heat resistance level 3, the upper surface of the fiberboard has a clear purple stem and leaf pattern.

[0027] Note: Sampling is carried out according to the product according to ISO15528:2000, and the sampling volume is determined according to the inspection needs. The temperature and humidity of the state adjustment and experiment shall comply with the provisions of GB / T9278-2008 Temperature and humidity of the state adjustment and experiment of the coating sample. The particle size distribution is carried out according to ISO8130-13:2001. The hardness is carried out according to ISO15184:1998, and the pencil is Zhonghua brand 101 drawing pencil. Adhesion is carried out according to GB / T4893.4-2013 Physical and chemical properties test of furniture surface paint film Part 4: Adhesion cross cutting determination method. Impact resistance is carried out according to GB / T4893.9-2013 Physical and chemical properties test of furniture surface paint film Part 9: Impact resistance determination method. Liquid resistance is carried out according to GB / T4893.1-2021 Physical and chemical properties test of furniture surface paint film Part 1: Cold liquid resistance determination method. The moisture and heat resistance test shall be carried out in accordance with the provisions of GB / T4893.2-2020 Physical and chemical properties test of furniture surface paint film Part 2: Determination method of moisture and heat resistance; the dry heat resistance test shall be carried out in accordance with the provisions of GB / T4893.3-2020 Physical and chemical properties test of furniture surface paint film Part 3: Determination method of dry heat resistance.

Claims

1. A powder coating fiberboard, characterized in that: It comprises a high-density fiberboard base layer, a stem and leaf rubbing layer and a powder coating layer; the stem and leaf rubbing layer is on the high-density fiberboard base layer, and the powder coating layer is on the stem and leaf rubbing layer.

2. The method for producing a fiberboard coated with a powder coating according to claim 1, characterized in that: The following steps are involved: The first step is to use a mordant conductive liquid to perform surface activation treatment on the fiberboard, and then air-dry it in a constant temperature and humidity environment until the surface moisture content is 11% to 12%, thereby obtaining a pretreated high-density fiberboard; the second step is to lay a waterproof plastic film flat under the high-density fiberboard, place plant stems and leaves on the high-density fiberboard, roll the high-density fiberboard with a warp beam or roll it together with the waterproof plastic film under it and fix it with a cable tie to obtain a high-density fiberboard roll wrapped on the warp beam; place the high-density fiberboard roll in a steam kettle at 105 to 110°C and steam it for 10 to 16 minutes to perform stem and leaf rubbing; The third step: use fluidized bed electrostatic spraying process to spray transparent powder coating onto the high-density fiberboard after stem and leaf rubbing, and after curing, the powder coating coated fiberboard is obtained.

3. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The plant stem and leaves are one of the following: ophiopogon stem and leaves, isatis indigo plant stem and leaves, and ramie stem and leaves.

4. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The fluidized bed electrostatic spraying process has an operating voltage of 40-50 kV, a current of 10-20 μA, a fluidized bed gas pressure of 0.03-0.05 MPa, a ripple voltage coefficient of 1%-2%, an electric field strength of 1-1.5 kV / cm, and a distance between the high-density fiberboard and the electrode of 20-30 cm.

5. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The third step curing temperature is 115-130° C., and the curing time is 4-6 minutes.

6. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The third step powder coating is a transparent polyester powder coating or a transparent acrylic ester powder coating, and the particle size of the powder coating is 20 to 50 μm.

7. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The density of the high-density fiberboard is 0.91-0.93 g / cm 3 1~1.35mm thick high-density fiberboard.

8. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The first step mordant conductive liquid is a water dispersion of wood ash liquid or alum liquid dispersed in water with a mass fraction of 2% to 4%.

9. The method for producing fiberboard coated with powder coating according to claim 1, characterized in that: The first step of activation treatment is to add mordant conductive liquid at 10-15g / m 2 Spray onto high-density fiberboard surface.