Environment-friendly foaming-controlled microcapsule

Abstract

The environment-friendly and foaming-controlled microcapsule comprises a foaming unit which is heated to foam and at least one layer of thermoplastic shell which covers the outer side of the foaming unit, when the environment-friendly and foaming-controlled microcapsule is not foamed, the unfoamed diameter of the environment-friendly and foaming-controlled microcapsule is 10-50 microns, and when the environment-friendly and foaming-controlled microcapsule is not foamed, the unfoamed diameter of the environment-friendly and foaming-controlled microcapsule is 10-50 microns. And when the environment-friendly and foaming-controlled microcapsule is heated to foam, the thickness of each layer of thermoplastic shell is 0.1-0.2 mu m. The foaming mode of the environment-friendly and foaming-controlled microcapsule is controlled, and the environment-friendly and foaming-controlled microcapsule is uniform in foaming density and does not discharge harmful substances to the environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of foaming materials, in particular to an environmentally friendly microcapsule with controlled foaming. Background Art

[0002] Foaming material is a material that expands by heating or chemical reaction. It is widely used in many fields such as construction, furniture, packaging, refrigeration, electrical appliances, automobiles, etc.

[0003] The existing foaming material combination is PVC resin + DOTP + limestone + azodicarbonamide (AC, foaming agent). Such a 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 excess AC (azodicarbonamide), because the resin cannot keep AC embedded in the polymer matrix, and a large amount of active AC is discharged into the atmosphere. Therefore, this combination and production process according to the prior art requires a careful thermal balance between the optimal state of activating the AC or foaming agent (to prevent residues from remaining in the foam) and preventing AC from escaping the slurry completely. Even when activated, AC will release heat, so the reaction is very difficult to control. Exhaust is also known to be discharged upward, resulting in a density gradient inside the material, affecting the overall foam quality and consistency. Utility Model Content

[0004] In view of this, the utility model provides an environmentally friendly, foaming-controlled microcapsule that can improve product quality to meet industrial needs.

[0005] An environmentally friendly, controlled foaming microcapsule comprises a foaming unit that foams when heated, and at least one layer of thermoplastic shell covering the outside of the foaming unit. When the environmentally friendly, controlled foaming microcapsule is not foamed, the unfoamed diameter of the environmentally friendly, controlled foaming microcapsule is 10-50um. When the environmentally friendly, controlled foaming microcapsule is foaming, the thickness of each layer of the thermoplastic shell is 0.1-0.2um.

[0006] Furthermore, the diameter of the environmentally friendly, controlled-foaming microcapsule is 30 um when it is not foamed.

[0007] Furthermore, the foamed volume of the environmentally friendly, controlled foaming microcapsules is n times the unfoamed volume of the environmentally friendly, controlled foaming microcapsules, wherein n is 80-100.

[0008] Furthermore, the environmentally friendly, controlled foaming microcapsule also includes at least one flame retardant layer disposed on the outside of the thermoplastic shell.

[0009] Furthermore, when the environmentally friendly, controlled foaming microcapsule comprises multiple layers of thermoplastic shells, flame retardants are arranged between the multiple layers of thermoplastic shells.

[0010] Compared with the prior art, the environmentally friendly and controlled foaming microcapsule provided by the utility model is wrapped with at least one layer of thermoplastic shell on the outside of the foaming unit. When the environmentally friendly and controlled foaming microcapsule is not foamed, the diameter of the environmentally friendly and controlled foaming microcapsule is 10-50um, and the environmentally friendly and controlled foaming microcapsule expands at an activation temperature of 160-200 degrees Celsius. When the environmentally friendly and controlled foaming microcapsule is heated and foamed, the foaming unit is heated and expanded, and the thermoplastic shell is expanded. The thickness of each layer of the thermoplastic shell is 0.1-0.2um, and when the environmentally friendly and controlled foaming microcapsule is heated and foamed, the activated foaming unit and the gas generated by the foaming unit are all within the volume of the thermoplastic shell, and the temperature of the activated foaming unit and the generated gas are not easy to volatilize, so that the foaming mode of the environmentally friendly and controlled foaming microcapsule is controlled, and the foaming density is uniform, and no harmful substances are discharged into the environment. It can be seen from this that the environmentally friendly, controlled foaming microcapsule has a controlled foaming mode, provides uniform foaming density, and does not emit harmful substances into the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of the first embodiment of the environmentally friendly, foaming-controlled microcapsule provided by the utility model.

[0012] Figure 2 This is a schematic structural diagram of the second embodiment of the environmentally friendly, foaming-controlled microcapsule provided by the utility model. DETAILED DESCRIPTION

[0013] The following is a further detailed description of the 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 protection scope of the present invention.

[0014] like Figure 1 to Figure 2 As shown, it is a schematic diagram of the structure of the environmentally friendly, controlled foaming microcapsule provided by the utility model. The environmentally friendly, controlled foaming microcapsule includes a foaming unit 10, and at least one layer of thermoplastic shell 20 coated on the outside of the foaming unit 10, and at least one layer of flame retardant layer 30 arranged on the outside of the thermoplastic shell 20. The environmentally friendly, controlled foaming microcapsule also includes some other functional modules, such as assembly components, etc., which should be well known to those skilled in the art and will not be described in detail here.

[0015] The foaming unit 10 includes a foaming agent (not shown) and an expansion agent (not shown). In the present embodiment, the foaming agent may be any one of AC (azodicarbonamide), HFC (hydrofluorocarbon), HCFC (hydrochlorofluorocarbon), HFO (hydrofluoroether), and NIPU (polyimino ether). The expansion agent is a material that can cause volume expansion through physical and chemical reactions. Both the foaming agent and the expansion agent are prior arts and will not be described in detail herein.

[0016] The thermoplastic shell 20 includes thermoplastic plastic and plasticizer. In the present embodiment, the thermoplastic plastic can be any one of PP (polypropylene), PE (polyethylene terephthalate), and PVC (polyvinyl chloride plastic). The plasticizer is an additive that increases the flexibility, elasticity, cold resistance, heat resistance, etc. of the plastic. The plasticizer improves the fluidity of the thermoplastic plastic. The thermoplastic plastic and the plasticizer are both existing technologies and will not be described in detail here.

[0017] When the environmentally friendly, controlled foaming microcapsule is not foamed, the diameter of the environmentally friendly, controlled foaming microcapsule is 10-50um. In this embodiment, when the environmentally friendly, controlled foaming microcapsule is not foamed, the diameter is 30um. The environmentally friendly, controlled foaming microcapsule expands at an activation temperature of 160-200 degrees Celsius. The foaming volume of the environmentally friendly, controlled foaming microcapsule is n times the unfoamed volume of the environmentally friendly, controlled foaming microcapsule, wherein n is 80-100, that is, the foaming unit 10 expands to 80-100 times its original volume, thereby the thermoplastic shell 20, each layer of the thermoplastic shell has a thickness of 0.1-0.2um, and when the environmentally friendly, controlled foaming microcapsule is heated and foamed, the activated foaming unit 10 and the gas generated by the foaming unit 10 are all within the volume of the thermoplastic shell 10, and the temperature of the activated foaming unit 10 is stable, and the generated gas is not easy to volatilize, so as to prevent the gas from taking away the temperature of the foaming unit 10, so that the foaming mode of the environmentally friendly, controlled foaming microcapsule is controlled, the overall foam quality is improved, and the foaming density is uniform, and no harmful substances are discharged into the environment.

[0018] The flame retardant layer 30 is a fireproof material that can form a fireproof layer on the surface of an object to prevent the object from burning in a fire, so that when the environmentally friendly, controlled foaming microcapsule is foamed, a layer of thermoplastic shell 20 is formed on the outside of the thermoplastic shell 20, thereby improving the performance of the environmentally friendly, controlled foaming microcapsule. The flame retardant layer 30 is a prior art and will not be described in detail here.

[0019] When the environmentally friendly, controlled foaming microcapsule includes multiple layers of thermoplastic shells 20, flame retardants are disposed between the multiple layers of the thermoplastic shells 20 to provide good flame retardant effects between the thermoplastic shells 20. The flame retardant is a prior art and will not be described in detail herein.

[0020] like Figure 1 FIG. 1 is a cross-sectional structural diagram of the first embodiment of the environmentally friendly, controlled foaming microcapsule, wherein the outer side of the foaming unit 10 is coated with a layer of the thermoplastic shell 20, and the outer side of the thermoplastic shell 20 is coated with a layer of flame retardant layer 30. Figure 2 The cross-sectional structure diagram of the second embodiment of the environmentally friendly, controlled foaming microcapsule is shown, in which the outer side of the foaming unit 10 is coated with two layers of the thermoplastic shell 20, and the outer side of the outermost thermoplastic shell 20 is provided with a flame retardant layer 30. In addition, the environmentally friendly, controlled foaming microcapsule can also have multiple layers of the thermoplastic shell 20 coated on the outer side of the foaming unit 10, and each layer of the thermoplastic shell 20 is provided with a flame retardant layer 30 or other functional layers on the outer side.

[0021] Compared with the prior art, the environmentally friendly, controlled foaming microcapsule provided by the utility model is formed by wrapping at least one layer of thermoplastic shell 20 on the outside of the foaming unit 10. When the environmentally friendly, controlled foaming microcapsule is not foamed, the unfoamed diameter of the environmentally friendly, controlled foaming microcapsule is 10-50um, and the environmentally friendly, controlled foaming microcapsule expands at an activation temperature of 160-200 degrees Celsius. When the environmentally friendly, controlled foaming microcapsule is heated and foamed, the foaming unit 10 is heated and expanded, and the thermoplastic shell 20 is expanded. The thickness of each layer of the thermoplastic shell is 0.1-0.2um. When the environmentally friendly, controlled foaming microcapsule is heated and foamed, the activated foaming unit 10 and the gas generated by the foaming unit 10 are all within the volume of the thermoplastic shell 20, and the temperature of the activated foaming unit 10 and the gas generated are not easy to volatilize, so that the foaming mode of the environmentally friendly, controlled foaming microcapsule is controlled, and the foaming density is uniform, and no harmful substances are discharged into the environment. It can be seen from this that the foaming mode of the environmentally friendly, controlled foaming microcapsule is controlled, and the foaming density is uniform, and no harmful substances are discharged into the environment.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent substitution or improvement within the spirit of the present invention are included in the scope of the claims of the present invention.

Claims

1. An environmentally friendly, controlled foaming microcapsule, characterized by: The environmentally friendly, controlled foaming microcapsule includes a foaming unit that foams when heated and at least one layer of thermoplastic shell covering the outside of the foaming unit. When the environmentally friendly, controlled foaming microcapsule is not foamed, the unfoamed diameter of the environmentally friendly, controlled foaming microcapsule is 10-50um. When the environmentally friendly, controlled foaming microcapsule is foamed when heated, the thickness of each layer of the thermoplastic shell is 0.1-0.2um.

2. The environmentally friendly, foaming controlled microcapsule according to claim 1, characterized in that: The environmentally friendly, controlled-foaming microcapsules have a diameter of 30 um when not foamed.

3. The environmentally friendly, controlled foaming microcapsule according to claim 1, characterized in that: The foamed volume of the environmentally friendly, controlled foaming microcapsule is n times the unfoamed volume of the environmentally friendly, controlled foaming microcapsule, wherein n is 80-100.

4. The environmentally friendly, foaming controlled microcapsule according to claim 1, characterized in that: The environmentally friendly, controlled foaming microcapsule also includes at least one flame retardant layer disposed outside the thermoplastic shell.

5. The environmentally friendly, controlled foaming microcapsule according to claim 1, characterized in that: When the environmentally friendly, controlled foaming microcapsule comprises multiple layers of thermoplastic shells, flame retardants are arranged between the multiple layers of the thermoplastic shells.

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