Preparation method of antistatic flame-retardant facing artificial board

Abstract

The invention relates to the technical field of facing artificial boards, in particular to a preparation method of an antistatic flame-retardant facing artificial board, which comprises a decorative paper preparation process, a base material preparation process and a compounding process, and the decorative paper preparation process sequentially comprises the following steps: step 1, obtaining a first raw material and a second raw material; secondly, the first raw material is treated in a blow molding mode, when the first raw material is subjected to blow molding to form a tubular hollow adhesive film and has the temperature of 110-120 DEG C, the second raw material with the temperature of 80-90 DEG C is provided for the outer side film face of the hollow adhesive film, and therefore the hollow decorative paper film is obtained; thirdly, the blow-molded hollow decorative paper film is led and taken; wherein the first raw material comprises a mixed adhesive added with a flame retardant, an initiator and a grafting monomer, and the second raw material comprises paper pulp added with an antistatic agent.

Description

Technical Field

[0001] This application relates to the technical field of decorative engineered wood panels, specifically a method for preparing an antistatic and flame-retardant resin-impregnated paper-faced engineered wood panel. Background Technology

[0002] It is known that resin-impregnated paper-faced engineered wood panels are composite decorative panels made by applying resin-impregnated paper as a decorative material to the surface of engineered wood panels such as particleboard, fiberboard, plywood, and laminated board, and then hot-pressing them. Existing technology for resin-impregnated paper involves impregnating decorative paper (commonly known as patterned paper) in melamine adhesive and then drying it to obtain melamine-impregnated paper.

[0003] The current melamine-impregnated paper has some drawbacks. First, the paper is relatively brittle and easily damaged during processing. Second, melamine-impregnated paper is stored in sheets, which is not conducive to continuous production. Third, some decorative papers with special functions, such as antistatic and flame-retardant decorative papers, achieve their properties by improving the function of the adhesive. Therefore, it is necessary to maintain the uniform distribution of functional agents in the adhesive throughout the impregnation process in order to obtain decorative paper with uniform antistatic and flame-retardant properties across the entire sheet. Summary of the Invention

[0004] This application provides a method for preparing antistatic and flame-retardant resin-impregnated paper-faced engineered wood panels, which enables continuous production and produces panels with uniform antistatic and flame-retardant properties across their surface. The specific technical solution adopted in this application is as follows:

[0005] A method for preparing an antistatic and flame-retardant decorative artificial board includes a decorative paper preparation process, a substrate preparation process, and a composite process. The decorative paper preparation process sequentially includes the following steps:

[0006] Step 1: Obtain the first raw material and the second raw material;

[0007] Step 2: The first raw material is processed by blow molding, and when the first raw material is blow molded into a tubular hollow film with a temperature of 110-120°C, the second raw material with a temperature of 80-90°C is provided to the outer film surface of the hollow film to obtain a hollow decorative paper film.

[0008] Step three: Take out the blow-molded hollow decorative paper film; wherein,

[0009] The first raw material includes a mixed adhesive containing flame retardant, initiator and graft monomer, and the second raw material includes pulp containing antistatic agent.

[0010] In a preferred embodiment, the second raw material encapsulates the hollow film within a tubular molding cavity.

[0011] In a preferred embodiment, the second raw material flows along the inner wall of the molding cavity, and the first raw material is blow-molded into the molding cavity and can contact the second raw material.

[0012] In a preferred embodiment, the molding cavity is vertically arranged, the second raw material flows from top to bottom, and the first raw material is blow-molded from bottom to top.

[0013] In a preferred embodiment, the viscosity of the second raw material is 20-25 mPa·s, and the flow rate is 0.8-1.2 m / s.

[0014] In a preferred embodiment, the hollow decorative paper film is calendered to obtain the decorative paper film.

[0015] In a preferred embodiment, the first raw material is obtained through the following steps: adding silicon-containing small molecule materials, phosphorus-containing small molecule materials, nitrogen-containing small molecule materials and carbon-containing small molecule materials to an organic solvent and mixing them; then adding an initiator and a grafting monomer to the organic solvent in sequence and mixing them to obtain a blended modified mixture; and adding the blended modified mixture to a resin raw material to obtain the mixed adhesive.

[0016] In a preferred embodiment, the mass ratio of the antistatic agent to the pulp in the second raw material is 1:(30-35).

[0017] In a preferred embodiment, the lamination process involves providing the hollow decorative paper film to the surface of the substrate, using a calendering process to form a decorative paper film from the hollow decorative paper film, and simultaneously laminating the decorative paper film and the substrate.

[0018] In a preferred embodiment, the substrate is one of fiberboard, laminated board, or plywood.

[0019] The method for preparing antistatic and flame-retardant decorative artificial board provided in this embodiment can achieve continuous production, and the antistatic and flame-retardant properties are uniform throughout the surface of the decorative artificial board. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide further explanation of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0021] Figure 1 This is a schematic diagram of a device for preparing antistatic and flame-retardant decorative artificial boards provided in an embodiment of this application.

[0022] Figure 2This is a schematic diagram of a slurry-spraying tank provided in an embodiment of this application.

[0023] In the attached diagrams: 10, feeder; 20, extruder; 30, blow molding machine; 40, slurry tank; 41, molding cavity; 42, material flow section; 421, top edge surface; 43, feed pipe; 44, nozzle; 45, recycling tank; 50, extraction machine; 51, frame; 52, extraction die head; 53, extraction wheel assembly; 60, composite calender; 70, printing machine; 81, hollow film; 82, hollow decorative paper film; 83, decorative paper film; 84, decorative paper; 90, substrate; 100, axis. Detailed Implementation

[0024] The technical solutions in this application are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Figure 1 The diagram schematically illustrates the equipment for preparing the antistatic and flame-retardant decorative artificial board according to this embodiment, including a reaction vessel for preparing a first raw material and a pulping machine for preparing a second raw material (both are not shown in the attached diagram). Figure 1 middle).

[0026] The discharge port of the reactor is connected to the feeder 10, which provides a first raw material to the feeder 10. The feeder 10 is any type of feeder in the prior art. The discharge port of the feeder 10 is connected to the inlet of the extruder 20, which provides a first raw material to the extruder 20. The extruder 20 is any type of extruder in the prior art, such as a screw extruder with a heating function. The discharge port of the extruder 20 is connected to the inlet of the blow molding machine 30, which provides a first raw material with a suitable blowing temperature to the blow molding machine 30. The blow molding machine 30 is any type of extruder in the prior art, such as a blow molding machine using an air compressor as a gas source. Preferably, the blow outlet of the blow molding machine 30 is oriented directly upwards.

[0027] The discharge port of the pulping machine is connected to the pulping tank 40, and it can provide a second raw material to the pulping tank 40. (Refer to...) Figure 2 As shown, the slurry tank 40 includes a tank body with a forming cavity 41, a material flow section 42, a feed pipe 43, a nozzle 44, and a recycling tank 45.

[0028] The forming cavity 41 is a generally cylindrical cavity with an axis 100 that runs through it. A material-flowing section 42 connects the forming cavity 41 to the top opening. The material-flowing section 42 has an annular slope; specifically, the diameter of the top opening is larger than the diameter of the forming cavity 41. With the axis 100 as a reference, the inclination angle of the material-flowing section 42 is 30-35°. The forming cavity 41 surrounds the forming section of the hollow film 81, and its inner diameter matches the diameter of the forming section of the hollow film 81 blown by the blow molding machine 30. Specifically, the film thickness formed by the hollow film 81 blown by the blow molding machine 30 against the wall of the forming cavity 41 is 0.10-0.15 mm.

[0029] Nozzle 44 can be any type of existing technology, such as 10 F-type flat blowing nozzles (727 / 973 series) arranged in a ring at a 35° angle, connected end to end, and fixedly installed on the top edge surface 421 of the material flow section 42 by screwing, welding, or bonding. The pressure of nozzle 44 is controlled at 0.1-0.2 MPa so that the second raw material with a viscosity of 20-25 mPa·s at a temperature of 80-90°C can flow out at a speed of 0.8-1.2 m / s, and form a slurry thickness of about 0.10-0.15 mm after being squeezed by the hollow adhesive film 81. With axis 100 as the reference, the discharge angle of nozzle 44 is 1-3°, and the exact angle in this embodiment is 3°. In other words, with the wall surface of material flow section 42 as the reference, the discharge angle of nozzle 44 is 27-34°, and the exact angle in this embodiment is 30°.

[0030] The feed pipe 43 is a metal pipe with a diameter of 150-200mm. The specific diameter can be determined according to production needs and the pump used. One end of the feed pipe 43 is connected to the nozzle 44 through a control valve, pressure pump, etc., and the other end is connected to the discharge port of the pulping machine through existing accessories such as flexible pipe joints, loose flanges, clamp joints or rigid flanges.

[0031] In some preferred embodiments, a recycling trough 45 should be provided at the bottom of the barrel. The height of the recycling trough 45 along the axis 100 should be between the blow outlet of the blow molding machine 30 and the forming section of the hollow film 81. The recycling trough 45 is an annular groove fixed to the bottom of the barrel using existing technologies such as integral molding, sealing screw connection, or welding. A drainage port can be opened on the wall of the recycling trough 45, and excess second raw material can be diverted back to the discharge port of the pulping machine or to the waste pulp treatment tank using pumps, pipelines, etc. Alternatively, the recycling trough 45 can also be detachably installed at the bottom of the barrel using a sealing snap-fit ​​method.

[0032] The drawing machine 50 is any of the prior art, including a frame 51, a drawing die head 52, and a drawing wheel assembly 53, and is suitable for drawing the hollow decorative paper film 82 formed in the blow molding machine 30 and the slurry tank 40 into decorative paper film 83. The slurry tank 40 is preferably fixedly installed on the frame 51 by means of hoisting.

[0033] The composite calender 60 includes a roller conveyor or belt conveyor for feeding the substrate 90, a calender head, and a discharge section. The take-up roller assembly 53 of the take-up machine 50 can provide the taken-up decorative paper film 83 to the surface of the substrate 90, and under the action of the calender head, the decorative paper film 83 is formed into decorative paper 84 with a thickness of 0.18-0.2 mm and laminated with the substrate 90 to obtain a decorative artificial board.

[0034] In this embodiment, the designed pattern is printed on the surface of the decorative artificial board using an existing ink printing machine (3D overprinting).

[0035] Those skilled in the art will understand that the above-mentioned equipment should be equipped with a control cabinet, which can be any type of existing technology, such as a PLC control cabinet.

[0036] Using the above-mentioned equipment, this embodiment provides a method for preparing an antistatic and flame-retardant decorative artificial board, which generally includes (I) a decorative paper preparation process, (II) a substrate preparation process, and (III) a composite process. Among them, (I) the decorative paper preparation process includes the following steps in sequence.

[0037] Step 1 involves obtaining the first and second raw materials in any order.

[0038] Add silicon-functionalized small molecule materials, phosphorus-functionalized small molecule materials, nitrogen-functionalized small molecule materials, and carbon-functionalized small molecule materials to the organic solvent in the reactor, and mix at a stirring speed of 270 r / min for 2.5 min; then add the initiator and graft monomer to the organic solvent in sequence and mix to obtain a blended modified mixture. Add the blended modified mixture to the resin raw material to finally obtain a mixed adhesive.

[0039] In this embodiment, the organic solvent is octyl phthalate, the silicon-functionalized small molecule material is methyltrichlorosilane, the phosphorus-functionalized small molecule material is triphenyl phosphite, the nitrogen-functionalized small molecule material is N,N-dimethylformamide, the carbon-functionalized small molecule material is graphene, the initiator is a combination of benzoyl peroxide and N,N-dimethylaniline, the grafting monomer is methacrylic acid, and the resin raw material is polyvinyl chloride. The dosage ratio is 1g of silicon-functionalized small molecule material, 1g of phosphorus-functionalized small molecule material, 1g of nitrogen-functionalized small molecule material, 1g of carbon-functionalized small molecule material, 4g of initiator, 100g of grafting monomer, and 4kg of resin raw material per 100ml of organic solvent.

[0040] Using the above method, small molecule materials containing silicon, phosphorus, nitrogen, and carbon functional groups are added to a mixture, or a mixture is prepared together with an initiator, organic solvent, and graft monomer. Simultaneously, the small molecule materials with silicon, phosphorus, nitrogen, and carbon functional groups undergo hydrolysis and condensation in the organic solvent, resulting in a blended modified mixture. When this mixture is mixed with resin raw materials and applied in the film-forming process of an adhesive film, the silicon, phosphorus, nitrogen, and carbon elements hybridize as the extrusion or blow molding temperature increases, resulting in an adhesive film with a uniformly distributed quaternary hybrid flame retardant of silicon, phosphorus, nitrogen, and carbon. When this adhesive film is applied in the bonding process of engineered wood panels, it provides uniform flame retardant properties on the surface of the panel.

[0041] Using the above method, it is not necessary to prepare the silicon-phosphorus-nitrogen-carbon quaternary hybrid flame retardant in advance. Instead, it utilizes the established process steps in the existing film preparation method. Therefore, compared with the technical solution of preparing the silicon-phosphorus-nitrogen-carbon quaternary hybrid flame retardant separately in advance, it can reduce the production cost.

[0042] Pulp is supplied to the pulper, and an antistatic agent is added. The antistatic agent can be any of those available in the art, but preferably includes: halogenated quaternary ammonium salts, polymerizable carboxylic acid monomers, acrylamide monomers (crosslinking agents), and a composition of benzoyl peroxide and N,N-dimethylaniline (initiator). The mixture is stirred thoroughly in the pulper. The mass ratio of antistatic agent to pulp is 1:(30-35).

[0043] In the second step, the first raw material is processed by blow molding. When the first raw material is blow molded into a tubular hollow film at a temperature of 110-120°C, a second raw material at a temperature of 80-90°C is provided to the outer surface of the hollow film to obtain a hollow decorative paper film.

[0044] Specifically, the first raw material in the reactor is heated to 115-125°C in the extruder 20 and then sent to the blow molding machine 30. When the first raw material enters the blow molding machine 30, it still has a temperature of 110-120°C and is blow molded to form a hollow film 81 under this temperature condition.

[0045] The hollow film 81 is blow-formed from bottom to top in the center of the forming cavity 41 of the slurry tank 40. It encounters the second raw material flowing and leveling on the wall of the forming cavity 41 from top to bottom. As a result, the second raw material can adhere to the outer surface of the hollow film 81 and leave the slurry tank 40 with the hollow film 81. That is, the second raw material wraps the hollow film 81, thereby forming a hollow decorative paper film 82.

[0046] Step 3: Take out the blow-molded hollow decorative paper film.

[0047] The hollow decorative paper film 82 continues to be blow-molded after leaving the coating tank 40, thus cooling it. Its temperature should be controlled at 65-70°C when it enters the drawing machine 50. After being drawn by the drawing machine 50, it forms the decorative paper film 83.

[0048] (ii) The substrate preparation process selects one of the existing technologies: fiberboard, laminated board, or plywood. These engineered wood panels have relatively flat surfaces suitable for film finishing and printing. However, in practice, the preparation method provided in this embodiment can also be applied to log boards that have undergone surface smoothing treatment (e.g., UV lacquer priming).

[0049] (iii) The lamination process involves providing the extracted hollow decorative paper film to the surface of the substrate, using a calendering process to form decorative paper film 83, and simultaneously laminating decorative paper film 83 and substrate 90, thereby forming decorative paper 84 on the surface of substrate 90. Finally, printing treatment may or may not be performed on the surface of decorative paper 84, as needed.

[0050] Example 1: The first raw material was prepared according to the following proportions: 100 ml of octyl phthalate solvent corresponds to 1 g of methyltrichlorosilane, 1 g of triphenyl phosphite, 1 g of N,N-dimethylformamide, 1 g of graphene, 4 g of a composition of benzoyl peroxide and N,N-dimethylaniline, 100 g of methacrylic acid and 4 kg of polyvinyl chloride resin raw material.

[0051] The second raw material was prepared according to the following proportions: 1g of a halogenated quaternary ammonium salt, 2g of a polymerizable carboxylic acid monomer, 0.6g of an acrylamide monomer (crosslinking agent), and 0.4g of a composition of benzoyl peroxide and N,N-dimethylaniline (initiator). The mass ratio of antistatic agent to pulp was 1:32.

[0052] The thickness of the hollow film 81 blown by the blow molding machine 30 is 0.13±0.01mm, the thickness of the slurry formed by the second raw material is 0.13±0.01mm, and the thickness of the decorative paper film 83 drawn by the drawing machine 50 is 0.24-0.28mm and the width is 145mm.

[0053] The selected substrate 90 is a laminate with a thickness of 12mm and a width of 150mm.

[0054] The two materials are combined using a composite calender 60. The calendering pressure is set to 0.8 MPa and the calendering feed speed is set to 1.2 m / s. After calendering, the thickness of the decorative paper 84 on the surface of the substrate 90 is 0.2 mm.

[0055] Excess decorative paper 84 in the width direction of the substrate 90 is cut off to obtain the antistatic and flame-retardant decorative artificial board of this application embodiment.

[0056] According to EN 13501-1, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 1, and the flame retardant rating of each test point was found to be Class B. According to GB / T 36340-2018, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 1, and the average surface resistance of each test point was found to be 2.1 × 10⁻⁶. 9 Ω, minimum value is 2×10 9 Ω, with a maximum value of 2.2 × 10 9 Ω.

[0057] Example 2: The difference between this example and Example 1 is that the selected substrate 90 is a fiberboard with a thickness of 12mm and a width of 150mm.

[0058] According to EN 13501-1, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 2, and the flame retardant rating of each test point was found to be Class B. According to GB / T 36340-2018, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 2, and the average surface resistance of each test point was found to be 1.5 × 10⁻⁶. 9 Ω, minimum value is 1.42 × 10 9 Ω, with a maximum value of 1.55 × 10 9 Ω.

[0059] Example 3: The difference between this example and Example 1 is that the substrate 90 used is a plywood with a thickness of 16mm and a width of 150mm.

[0060] According to EN 13501-1, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 1, and the flame retardant rating of each test point was found to be Class B. According to GB / T 36340-2018, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 1, and the average surface resistance of each test point was found to be 4 × 10⁻⁶. 9 Ω, minimum value is 3.98 × 10 9 Ω, with a maximum value of 4.1 × 10 9 Ω.

[0061] Comparative Example: Following existing techniques, flame retardants and antistatic agents of the same formulation were mixed into melamine adhesive, and then melamine-impregnated decorative paper was obtained through a traditional impregnation method. The melamine-impregnated decorative paper was then laminated with fiberboard using an existing hot-pressing process, specifically at a temperature of 210°C and a pressure of 1.2 MPa, to prepare impregnated paper decorative fiberboard.

[0062] According to EN 13501-1, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 1. The highest flame retardant rating was Class B, and the lowest was Class C. According to GB / T 36340-2018, 10 test points were randomly selected on the surface of the antistatic flame-retardant veneer panel of Example 1. The average surface resistance of each monitoring point was 1.5 × 10⁻⁶. 9 Ω, minimum value is 1.38 × 10 9 Ω, with a maximum value of 1.62 × 10 9 Ω.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for producing an antistatic fire-retardant surface veneer board, comprising a decorative paper production process, a substrate production process, and a lamination process, characterized by, The decorative paper preparation process includes the following steps in sequence: Step 1: Obtain the first raw material and the second raw material; Step 2: The first raw material is processed by blow molding, and when the first raw material is blow molded into a tubular hollow film with a temperature of 110-120°C, the second raw material with a temperature of 80-90°C is provided to the outer film surface of the hollow film to obtain a hollow decorative paper film. Step three: Take out the blow-molded hollow decorative paper film; wherein, The first raw material includes a mixed adhesive containing flame retardant, initiator and graft monomer, and the second raw material includes pulp containing antistatic agent.

2. The method for producing an anti-static, fire-retardant, faced wood-based panel according to claim 1, characterized in that, The second raw material encapsulates the hollow film within a tubular molding cavity.

3. The method for producing an anti-static, fire-retardant, faced wood-based panel according to claim 2, characterized in that, The second raw material flows along the inner wall of the molding cavity, and the first raw material is blow-molded into the molding cavity and can come into contact with the second raw material.

4. The method for producing an anti-static, fire-retardant, faced wood-based panel according to claim 3, characterized in that, The molding cavity is vertically arranged, the second raw material flows from top to bottom, and the first raw material is blow-molded from bottom to top.

5. The method for producing an anti-static, fire-retardant, faced wood-based panel according to claim 4, characterized in that, The viscosity of the second raw material is 20-25 mPa·s, and the flow rate is 0.8-1.2 m / s.

6. The method for producing an anti-static fire-retardant finished wood-based panel according to claim 1, characterized in that, The hollow decorative paper film is calendered to obtain the decorative paper film.

7. The method for producing an anti-static fire-retardant finished wood-based panel according to claim 1, characterized in that, The first raw material is obtained through the following steps: adding silicon-functionalized small molecule materials, phosphorus-functionalized small molecule materials, nitrogen-functionalized small molecule materials and carbon-functionalized small molecule materials to an organic solvent and mixing them; then adding an initiator and a grafting monomer to the organic solvent in sequence and mixing them to obtain a blended modified mixture; and adding the blended modified mixture to a resin raw material to obtain the mixed adhesive.

8. The method for preparing antistatic and flame-retardant decorative artificial board according to claim 1, characterized in that, In the second raw material, the mass ratio of the antistatic agent to the pulp is 1:(30-35).

9. The method for preparing antistatic and flame-retardant decorative artificial board according to claim 1, characterized in that, The composite process involves providing the hollow decorative paper film to the surface of the substrate, using a calendering process to form a decorative paper film from the hollow decorative paper film, and simultaneously bonding the decorative paper film and the substrate.

10. The method for preparing antistatic and flame-retardant decorative artificial board according to claim 1, characterized in that, The substrate is one of fiberboard, laminate, or plywood.

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