Foaming PVC (polyvinyl chloride) composite board and production method thereof

Abstract

The invention discloses a foaming PVC composite board and a production method thereof, the foaming PVC composite board comprises a composite board body, the composite board body comprises a PVC foaming layer, a face board and a back board, the face board is located on the front side of the PVC foaming layer, the back board is located on the back side of the face board, and the face board comprises a first flame retardant layer, a first grid layer, a PVC surface layer and a first composite aluminum board. By means of the method, the pressure resistance of the PVC foam board can be effectively improved, the PVC foam board can have good flame retardant performance by adding the flame retardant layer, fire disasters are effectively prevented from occurring and spreading, the tensile strength and the shear strength of the PVC foam board can be enhanced through the grid layer, the toughness and the impact resistance of the PVC foam board can be improved, and the PVC foam board has the good flame retardant performance. The composite layer aluminum plate has high strength and rigidity, the overall compression resistance of the PVC foaming plate can be improved, when the PVC foaming plate is subjected to external force, the aluminum plate can effectively disperse pressure, and the PVC foaming plate is prevented from being deformed or damaged.

Description

Technical Field

[0001] The invention relates to the technical field of foamed PVC composite boards, in particular to a foamed PVC composite board and a production method thereof. Background Art

[0002] PVC foam board is a lightweight board made of polyvinyl chloride resin, additives and foaming agents through hot pressing molding process. It has uniform pores inside the structure, so it has good lightweight and sound insulation and heat insulation effects. PVC foam board is widely used in construction, advertising, home decoration, furniture, automobile, electronics and other fields due to its excellent physical properties, processing convenience and low cost.

[0003] According to the Chinese patent application number: 202120926975.2, a PVC composite foam board is disclosed, comprising: a PVC wear-resistant layer, a first mesh fiber layer, a PVC foam substrate layer, a second mesh fiber layer and a PVC reinforcement layer arranged in sequence from top to bottom; the PVC foam substrate layer comprises a first foam buffer layer, a stabilizing layer and a second foam buffer layer arranged in sequence from top to bottom through physical heat synthesis into a whole; and the first foam buffer layer is uniformly embedded with a plurality of high-elastic rubber particles;

[0004] The prior art effectively solves the problem that PVC foam boards are easily deformed and damaged, and has the advantage of improving the use strength of PVC foam boards. However, due to the high strength of PVC foam boards, PVC foam boards are brittle and have poor compressive resistance, and are easily broken and damaged when subjected to excessive pressure.

[0005] To this end, a foamed PVC composite board and a production method thereof are provided. Summary of the invention

[0006] The object of the present invention is to provide a foamed PVC composite board and a production method thereof, which have the advantage of improving the compression resistance of the PVC foam board and solve the problem that the PVC foam board is brittle and has poor compression resistance due to the high strength of the PVC foam board, and is easily broken and damaged when subjected to excessive pressure.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a foamed PVC composite board, comprising a composite board body, wherein the composite board body comprises a PVC foam layer, a panel and a back panel, wherein the panel is located on the front side of the PVC foam layer, and the back panel is located on the back side of the panel, wherein the panel comprises a first flame retardant layer, a first mesh layer, a PVC surface layer and a first composite aluminum plate, wherein the back panel comprises a second flame retardant layer, a second mesh layer, a PVC bottom layer and a second composite aluminum plate, wherein the first flame retardant layer and the second flame retardant layer are respectively bonded to the front side and the back side of the PVC foam layer.

[0008] Preferably, the first flame retardant layer is bonded to the front side of the PVC foam layer, the first mesh layer is bonded to the surface of the first flame retardant layer, the PVC surface layer is bonded to the surface of the first mesh layer, and the first composite aluminum plate is bonded to the surface of the PVC surface layer.

[0009] Preferably, the second flame retardant layer is bonded to the back side of the PVC foam layer, the second mesh layer is bonded to the surface of the second flame retardant layer, the PVC bottom layer is bonded to the surface of the second mesh layer, and the second composite aluminum plate is bonded to the surface of the PVC bottom layer.

[0010] Preferably, the PVC foam layer, PVC surface layer and PVC bottom layer are all made of polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler through a foaming process, and the mixing ratio is 70% polyvinyl chloride, 2% foaming agent, 2% stabilizer, 1% anti-ultraviolet agent, 15% plasticizer and 10% filler. The filler can be calcium carbonate or talcum powder.

[0011] Preferably, the first flame retardant layer and the second flame retardant layer are both made of glass fiber, the first mesh layer and the second mesh layer are both made of fiber mesh, and the first composite aluminum plate and the second composite aluminum plate are both made of lightweight aluminum plates.

[0012] Preferably, the production method comprises the following steps:

[0013] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0014] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer is bonded to the front plate and the back plate by using a composite adhesive, the first flame retardant layer and the second flame retardant layer are respectively bonded to the front and back of the PVC foam layer, the first mesh layer is bonded to the surface of the first flame retardant layer by using a composite adhesive, the PVC surface layer is bonded to the surface of the first mesh layer, the second mesh layer is bonded to the surface of the second flame retardant layer, and the PVC bottom layer is bonded to the surface of the second mesh layer;

[0015] c) Finally, the first composite aluminum plate and the second composite aluminum plate are composited, and the composite adhesive is coated on one side of the first composite aluminum plate and the second composite aluminum plate respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer and the PVC surface layer, and then the first composite aluminum plate and the second composite aluminum plate are bonded to the PVC surface layer and the PVC bottom layer respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam plate is cured by heating and curing, and a foamed PVC composite plate can be obtained after the curing.

[0016] Preferably, the raw materials in step a are mixed and prepared using a high shear mixer, and the mixing temperature is controlled at 110° C., the mixing time is 10 min, and the rotation speed is 430-860 r / min. The extruder in step a is a twin-screw extruder, and the composite adhesive in step c is polyurethane glue.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention can effectively improve the compression resistance of the PVC foam board through the method, and can make the PVC foam board have good flame retardant performance by adding the flame retardant layer, so as to effectively prevent the occurrence and spread of fire, and can not only enhance the tensile strength and shear strength of the PVC foam board through the mesh layer, but also improve the toughness and impact resistance of the PVC foam board, and the composite layer aluminum plate has high strength and rigidity, so as to improve the overall compression resistance of the PVC foam board, and when the PVC foam board is subjected to external force, the aluminum plate can effectively disperse the pressure, so as to prevent the PVC foam board from being deformed or damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a schematic structural diagram of the connection state between the PVC foam layer and the panel of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the connection state of the PVC foam layer and the back plate of the present invention.

[0022] In the figure: 1. composite board body; 11. PVC foam layer; 12. panel; 121. first flame retardant layer; 122. first mesh layer; 123. PVC surface layer; 124. first composite aluminum plate; 13. back plate; 131. second flame retardant layer; 132. second mesh layer; 133. PVC bottom layer; 134. second composite aluminum plate. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides a technical solution, a foamed PVC composite board, comprising a composite board body 1, the composite board body 1 comprising a PVC foam layer 11, a panel 12 and a back panel 13, the panel 12 is located on the front side of the PVC foam layer 11, the back panel 13 is located on the back side of the panel 12, the panel 12 comprises a first flame retardant layer 121, a first mesh layer 122, a PVC surface layer 123 and a first composite aluminum plate 124, the back panel 13 comprises a second flame retardant layer 131, a second mesh layer 132, a PVC bottom layer 133 and a second composite aluminum plate 134, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front side and the back side of the PVC foam layer 11.

[0025] The production method comprises the following steps:

[0026] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0027] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0028] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0029] Embodiment 2:

[0030] In the first embodiment, the following process is added:

[0031] The first flame retardant layer 121 is bonded to the front side of the PVC foam layer 11 , the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 , the PVC surface layer 123 is bonded to the surface of the first mesh layer 122 , and the first composite aluminum plate 124 is bonded to the surface of the PVC surface layer 123 .

[0032] The production method comprises the following steps:

[0033] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0034] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0035] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0036] Embodiment three:

[0037] In the second embodiment, the following process is added:

[0038] The second flame retardant layer 131 is bonded to the back of the PVC foam layer 11 , the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131 , the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132 , and the second composite aluminum plate 134 is bonded to the surface of the PVC bottom layer 133 .

[0039] The production method comprises the following steps:

[0040] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0041] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0042] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0043] Embodiment 4:

[0044] In the third embodiment, the following process is added:

[0045] The PVC foam layer 11, the PVC surface layer 123 and the PVC bottom layer 133 are all made of polyvinyl chloride, a foaming agent, a stabilizer, an anti-ultraviolet agent, a plasticizer and a filler through a foaming process, and the mixing ratio is 70% polyvinyl chloride, 2% foaming agent, 2% stabilizer, 1% anti-ultraviolet agent, 15% plasticizer and 10% filler. The filler can be calcium carbonate or talcum powder.

[0046] The production method comprises the following steps:

[0047] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0048] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0049] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0050] Embodiment five:

[0051] In the fourth embodiment, the following process is added:

[0052] The first flame retardant layer 121 and the second flame retardant layer 131 are both made of glass fiber, the first mesh layer 122 and the second mesh layer 132 are both made of fiber mesh, and the first composite aluminum plate 124 and the second composite aluminum plate 134 are both made of lightweight aluminum plates.

[0053] The production method comprises the following steps:

[0054] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0055] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0056] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0057] Embodiment six:

[0058] In the fifth embodiment, the following process is added:

[0059] In step a, the raw materials are mixed and prepared using a mixing high shear mixer, and the mixing temperature is controlled at 110° C., the mixing time is 10 min, and the rotation speed is 430-860 r / min. In step a, the extruder is a twin-screw extruder, and in step c, the composite adhesive is polyurethane glue.

[0060] The production method comprises the following steps:

[0061] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0062] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0063] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0064] A method for producing a foamed PVC composite board, the method comprising the following steps:

[0065] a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand;

[0066] b) Then, the aluminum plate is subjected to surface treatment, and impurities such as oil, dust, etc. on the surface of the aluminum plate are removed by cleaning and polishing, and then a composite operation is performed, in which the PVC foam layer 11 is bonded to the panel 12 and the back plate 13 by using a composite adhesive, the first flame retardant layer 121 and the second flame retardant layer 131 are respectively bonded to the front and back of the PVC foam layer 11, the first mesh layer 122 is bonded to the surface of the first flame retardant layer 121 by a composite adhesive, the PVC surface layer 123 is bonded to the surface of the first mesh layer 122, the second mesh layer 132 is bonded to the surface of the second flame retardant layer 131, and the PVC bottom layer 133 is bonded to the surface of the second mesh layer 132;

[0067] c) Finally, the first composite aluminum plate 124 and the second composite aluminum plate 134 are composited, and the composite adhesive is coated on one side of the first composite aluminum plate 124 and the second composite aluminum plate 134 respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer 133 and the PVC surface layer 123, and then the first composite aluminum plate 124 and the second composite aluminum plate 134 are bonded to the PVC surface layer 123 and the PVC bottom layer 133 respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foam board is cured by heating and curing, and a foamed PVC composite board can be obtained after the curing.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foamed PVC composite board, comprising a composite board body (1), characterized in that: The composite board body (1) comprises a PVC foam layer (11), a panel (12) and a back panel (13); the panel (12) is located on the front side of the PVC foam layer (11); the back panel (13) is located on the back side of the panel (12); the panel (12) comprises a first flame retardant layer (121), a first mesh layer (122), a PVC surface layer (123) and a first composite aluminum plate (124); the back panel (13) comprises a second flame retardant layer (131), a second mesh layer (132), a PVC bottom layer (133) and a second composite aluminum plate (134); the first flame retardant layer (121) and the second flame retardant layer (131) are respectively bonded to the front side and the back side of the PVC foam layer (11).

2. The foamed PVC composite board according to claim 1, characterized in that: The first flame retardant layer (121) is bonded to the front side of the PVC foam layer (11), the first mesh layer (122) is bonded to the surface of the first flame retardant layer (121), the PVC surface layer (123) is bonded to the surface of the first mesh layer (122), and the first composite aluminum plate (124) is bonded to the surface of the PVC surface layer (123).

3. The foamed PVC composite board according to claim 1, characterized in that: The second flame retardant layer (131) is bonded to the back side of the PVC foam layer (11), the second mesh layer (132) is bonded to the surface of the second flame retardant layer (131), the PVC bottom layer (133) is bonded to the surface of the second mesh layer (132), and the second composite aluminum plate (134) is bonded to the surface of the PVC bottom layer (133).

4. The foamed PVC composite board according to claim 1, characterized in that: The PVC foam layer (11), the PVC surface layer (123) and the PVC bottom layer (133) are all made of polyvinyl chloride, a foaming agent, a stabilizer, an anti-ultraviolet agent, a plasticizer and a filler through a foaming process, and the mixing ratio is 70% polyvinyl chloride, 2% foaming agent, 2% stabilizer, 1% anti-ultraviolet agent, 15% plasticizer and 10% filler. The filler can be calcium carbonate or talcum powder.

5. The foamed PVC composite board according to claim 1, characterized in that: The first flame retardant layer (121) and the second flame retardant layer (131) are both made of glass fiber, the first mesh layer (122) and the second mesh layer (132) are both made of fiber mesh, and the first composite aluminum plate (124) and the second composite aluminum plate (134) are both made of lightweight aluminum plates.

6. The method for producing a foamed PVC composite board according to any one of claims 1 to 5, characterized in that: The production method comprises the following steps: a) First, the foamed board is made. Polyvinyl chloride, foaming agent, stabilizer, anti-ultraviolet agent, plasticizer and filler are mixed in a certain proportion, and then the mixed raw materials are added into an extruder. After high-temperature heating, they are melted and plasticized, and then extruded through a mold to form a board. Then, the extruded board is foamed through a chemical foaming process. After extrusion molding and foaming, the PVC foamed board is still in a high-temperature state. At this time, it needs to be quickly cooled down through a cooling water tank to fix the foaming structure and harden it, and then the board is cut according to demand; b) the aluminum plate is then surface treated by cleaning and polishing to remove impurities such as oil, dust, etc. on the surface of the aluminum plate, and then a composite operation is performed, wherein the PVC foam layer (11) is bonded to the front panel (12) and the back panel (13) by using a composite adhesive, the first flame retardant layer (121) and the second flame retardant layer (131) are respectively bonded to the front and back of the PVC foam layer (11), the first mesh layer (122) is bonded to the surface of the first flame retardant layer (121) by using a composite adhesive, the PVC surface layer (123) is bonded to the surface of the first mesh layer (122), the second mesh layer (132) is bonded to the surface of the second flame retardant layer (131), and the PVC bottom layer (133) is bonded to the surface of the second mesh layer (132); c) Finally, the first composite aluminum plate (124) and the second composite aluminum plate (134) are composited, and composite adhesive is coated on one side of the first composite aluminum plate (124) and the second composite aluminum plate (134), respectively, and then the composite adhesive is evenly coated on the surface of the PVC bottom layer (133) and the PVC surface layer (123), and then the first composite aluminum plate (124) and the second composite aluminum plate (134) are bonded to the PVC surface layer (123) and the PVC bottom layer (133) respectively, and a certain pressure is applied to make the two firmly bonded together. After the composite is completed, the composite PVC foamed board is cured by heating and curing. After the curing is completed, a foamed PVC composite board can be obtained.

7. The method for producing a foamed PVC composite board according to claim 6, characterized in that: In step a, the raw materials are mixed and prepared using a mixing high shear mixer, and the mixing temperature is controlled at 110° C., the mixing time is 10 min, and the rotation speed is 430-860 r / min. In step a, the extruder is a twin-screw extruder, and in step c, the composite adhesive is polyurethane glue.

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