PVC (polyvinyl chloride) foam core plate with microspheres
By using a thermoplastic shell with a microcapsule structure to cover the foaming part in the PVC foam core board, the problems of uneven density and environmental pollution in the production process are solved, and efficient and environmentally friendly foam core board production is achieved.
Patent Information
- Application Number
- CN202422459886.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-11
AI Technical Summary
Existing PVC foam core boards require a large amount of azodicarbonamide to be added during the production process to ensure processing stability, but it is difficult to control during the activation process, resulting in uneven material density and environmental pollution.
It adopts a microcapsule structure. Each microcapsule includes a thermoplastic shell and a foaming part. The thermoplastic shell seals and covers the foaming part. When activated, the foaming part expands to 80-100 times its original volume, and the thermoplastic shell stretches to 0.1-0.2 microns. The foaming process is controlled to avoid the emission of harmful substances.
The uniformity of material density and environmentally friendly production process are achieved, which simplifies the production process, reduces costs and reduces environmental pollution.
Smart Images
Figure CN223327102U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of foam core boards, in particular to a PVC foam core board with microspheres. Background Art
[0002] The foam core board has beautiful appearance, bright color and good overall effect. It integrates load-bearing, heat preservation and waterproofing, and does not require secondary decoration. It is a kind of board with a wide range of uses, especially for temporary facilities on construction sites such as offices, warehouses, walls, etc. It also reflects the civilized construction of modern construction sites. It has obvious advantages in terms of rapid installation and commissioning, detachable and material turnover and reuse index, which can significantly reduce the cost of temporary facilities on construction sites. It will be an indispensable new lightweight building material.
[0003] Existing composite foam core panels are made from polyvinyl chloride (PVC), dioctyl phthalate (DOP), limestone, and azodicarbonamide. During processing, this combination is placed on a film and heated to 170-190 degrees Celsius to form a slurry. This combination and production method requires the addition of an excess of azodicarbonamide, as PVC cannot keep the azodicarbonamide embedded in the polymer matrix and releases a large amount of active azodicarbonamide into the atmosphere. This addition of excess azodicarbonamide ensures stable processing. Furthermore, this combination and production process according to the prior art requires a careful thermal balance between optimal activation of the azodicarbonamide or blowing agent to prevent residues from remaining in the foam and preventing the azodicarbonamide from completely escaping the slurry. Furthermore, even during activation, azodicarbonamide releases heat during the activation process, making the reaction difficult to control. Azodicarbonamide also generates gases during activation, and the exhaust gas is notoriously discharged upward, resulting in a density gradient within the material, which affects its quality. Utility Model Content
[0004] In view of this, the utility model provides a controllably foamed PVC foam core board with microspheres to meet industrial needs.
[0005] A PVC foam core board with microspheres includes at least one foam layer. Each foam layer includes a plurality of microcapsules. Each microcapsule includes a thermoplastic shell and a foaming portion housed within the thermoplastic shell, wherein the thermoplastic shell is sealed around the outside of the foaming portion.
[0006] Furthermore, the foaming portion expands at an activation temperature of 160-200 degrees Celsius.
[0007] Furthermore, the diameter of the thermoplastic shell is 30 microns.
[0008] Furthermore, a flame retardant layer is provided on a side of the thermoplastic shell facing the foaming portion.
[0009] Furthermore, the PVC foam core board with microspheres further includes a decorative layer arranged on one side of the foam layer, and a base layer arranged on a side of the decorative layer facing the foam layer.
[0010] Furthermore, the decorative layer is any one of paper, aluminum foil, color film, and UV board.
[0011] Furthermore, the thermoplastic shell is made of any one of polypropylene and polyethylene terephthalate.
[0012] Compared with the prior art, the PVC foam core board with microspheres provided by the present invention is formed by expanding microcapsules in the foam layer, wherein each of the microcapsules includes a thermoplastic shell and a foaming portion arranged in the thermoplastic shell. The thermoplastic shell is sealed and coated on the outside of the foaming portion. When the microcapsules are activated by heat, the foaming portion expands to 80-100 times its original volume, thereby stretching the thermoplastic shell and stretching the thickness of the thermoplastic shell to 0.1-0.2 microns, while still keeping the activated gas within the volume of the thermoplastic shell. The material can foam in a very controlled manner, providing a uniform density, leaving no trace of unreacted foaming agent, and will not emit harmful substances into the environment. It can be seen from this that the PVC foam core board with microspheres eliminates the need for a lot of fine-tuning and fine thermal balance in traditional methods, thereby simplifying the production process, shortening production time and reducing costs, and preventing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic structural diagram of the PVC foam core board with microspheres provided by the utility model.
[0014] Figure 2 for Figure 1 Schematic diagram of the structure of microcapsules in PVC foam core board with microspheres. DETAILED DESCRIPTION
[0015] The following is a further detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.
[0016] like Figures 1 to 2, which is a schematic structural diagram of the PVC foam core board with microspheres provided by the present invention. The PVC foam core board with microspheres comprises at least one foam layer 10, a decorative layer 20 disposed on one side of the foam layer 10, and a base layer 30 disposed on the side of the decorative layer 20 facing the foam layer 10. The PVC foam core board with microspheres also includes other functional modules, such as assembly components, which are well known to those skilled in the art and will not be described in detail here.
[0017] The foam layer 10 comprises a plurality of microcapsules 11, each of which comprises a thermoplastic shell 111 and a foaming portion 112 disposed within the thermoplastic shell 111. The thermoplastic shell 111 is sealed around the outside of the foaming portion 112, retaining the activated gas in the foaming portion 112 within the volume of the thermoplastic shell 111. During the overshoot process, the microcapsules 11 are extruded and added to the melt, where they are heated and foamed to form a foam layer 10 blank. This foam layer 10 blank is then transferred to a thickness setting roller or cooling device for double-sided thickness setting, thus forming the foam layer 10.
[0018] The diameter of the thermoplastic shell 111 is 30 microns. The thermoplastic shell is made of any one of polypropylene (PP) and polyethylene terephthalate (PET). Polypropylene (PP) and polyethylene terephthalate (PET) are both existing technologies. A flame retardant layer 113 is provided on the side of the thermoplastic shell 111 facing the foaming portion 112 to prevent the thermoplastic shell 111 from burning during processing, and the flame retardant layer 113 is used to avoid affecting the rheological properties of the foaming portion 112.
[0019] The thermoplastic shell 111 is wrapped around the outside of the foaming portion 112, so that the thermoplastic shell 111 seals and wraps the foaming portion 112. In this embodiment, the foaming portion expands at an activation temperature of 160-200 degrees Celsius. When the microcapsule 11 is activated by heat, the foaming portion 112 expands to 80-100 times its original volume, thereby stretching the thermoplastic shell 111 and stretching the thickness of the thermoplastic shell 111 to 0.1-0.2 microns. At the same time, the activated gas is still kept within the volume of the thermoplastic shell 111, reducing environmental pollution and ensuring the uniform density of the foam layer 10. The thermoplastic shell 111 is a prior art and will not be described here.
[0020] The foaming portion 112 is made of polyvinyl chloride (PVC), dioctyl phthalate (DOTP), limestone, and a foaming agent. The foaming portion 112 is a conventional technology and will not be described in detail herein.
[0021] The decorative layer 20 is any one of paper, aluminum foil, color film, wear-resistant layer, and UV board. The decorative layer 20 is arranged on one side of the foam layer 10 to enhance the appearance of the foam layer 10. The decorative layer 20 is a prior art and will not be described in detail here.
[0022] The base layer 30 is used to support the decoration layer 20 and provide support force for the decoration layer 20 to improve the stability of the decoration layer 20 on the foam layer 10. The base layer 30 is an existing technology and will not be described in detail here.
[0023] Compared to the prior art, the PVC foam core board with microspheres provided by the present invention is formed by expanding microcapsules 11 in a foam layer 10, wherein each microcapsule 11 comprises a thermoplastic shell 111 and a foaming portion 112 disposed within the thermoplastic shell 111. The thermoplastic shell 111 is sealed around the outside of the foaming portion 112. When the microcapsule 11 is activated by heat, the foaming portion 112 expands to 80-100 times its original volume, thereby stretching the thermoplastic shell 111 and stretching the thickness of the thermoplastic shell 111 to 0.1-0.2 microns, while still keeping the activated gas within the volume of the thermoplastic shell 111. This material can foam in a very controlled manner, providing a uniform density, leaving no trace of unreacted foaming agent, and not emitting harmful substances into the environment. It can be seen from this that the PVC foam core board with microspheres eliminates the requirement for extensive fine-tuning and delicate thermal balancing required in traditional methods, thereby simplifying the production process, shortening production time and reducing costs, and preventing environmental pollution.
[0024] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements or improvements within the spirit of the present invention are included in the scope of the claims of the present invention.
Claims
1. A PVC foam core board with microspheres, characterized by: The PVC foam core board with microspheres includes at least one foam layer, each foam layer includes multiple microcapsules, each microcapsule includes a thermoplastic shell and a foaming part accommodated in the thermoplastic shell, and the thermoplastic shell is sealed and covered on the outside of the foaming part.
2. The PVC foam core board with microspheres according to claim 1, wherein: The foamed portion expands at an activation temperature of 160-200 degrees Celsius.
3. The PVC foam core board with microspheres according to claim 1, wherein: The thermoplastic shell has a diameter of 30 microns.
4. The PVC foam core board with microspheres according to claim 1, wherein: A flame retardant layer is provided on a side of the thermoplastic shell facing the foaming portion.
5. The PVC foam core board with microspheres according to claim 1, wherein: The PVC foam core board with microspheres further comprises a decorative layer arranged on one side of the foam layer, and a base layer arranged on a side of the decorative layer facing the foam layer.
6. The PVC foam core board with microspheres according to claim 5, characterized in that: The decorative layer is any one of paper, aluminum foil, color film and UV board.
7. The PVC foam core board with microspheres according to claim 1, wherein: The thermoplastic shell is made of any one of polypropylene and polyethylene terephthalate.