Continuous steam heating vacuum secondary foaming device
Through continuous steam heating vacuum secondary foaming device, the problem of poor stability of polyurethane foaming beads is solved, and foamed polyurethane beads with light density, fine cell and excellent resilience are produced.
Patent Information
- Application Number
- CN202411926701.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-02-18
AI Technical Summary
The polyurethane foamed beads produced in the prior art have poor stability, high density, large bubble cells, and poor rebound.
A continuous steam heating vacuum secondary foaming device is used to vacuum and steam heating through four continuous secondary foaming kettle bodies to produce foamed polyurethane beads.
The stability of polyurethane foamed beads is improved, with light density, fine cell and excellent resilience, and the bulk density is reduced to about 60kg/m3.
Smart Images
Figure CN119458748A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of polymer material preparation, in particular to a continuous steam heating vacuum secondary foaming device. Background Art
[0002] Polyurethane is a polymer material made from isocyanate and polyol through chemical reactions. Polyurethane is widely used in the manufacture of vehicles, electronics, construction, furniture and other fields due to its excellent physical and chemical properties. It is an extremely common synthetic material.
[0003] Compared with ordinary polyurethane, foaming agent is added in the production process of foaming polyurethane, which produces gas foam during the curing process to form a foaming structure. Therefore, foaming polyurethane has both the conventional properties of polyurethane and a firm foaming structure, thus having excellent performance in heat preservation, sound insulation, waterproofing, shockproofing, etc.
[0004] In the existing technology, the method of producing foamed polyurethane beads by extruding polyurethane with supercritical carbon dioxide is generally used to directly produce polyurethane with a bulk density of less than 120kg / m 3 The difficulty of producing polyurethane foam beads is very high, and the requirements for polyurethane raw materials and production equipment are too harsh, resulting in poor stability, high density, large pores and poor resilience of the produced polyurethane foam beads;
[0005] In view of the above problems, the inventors proposed a continuous steam heating vacuum secondary foaming device to solve the above problems. Summary of the invention
[0006] In order to solve the problem of poor stability of polyurethane foam beads produced by the prior art, the purpose of the present invention is to provide a continuous steam heating vacuum secondary foaming device.
[0007] In order to solve the above technical problems, the present invention adopts the following technical scheme: a continuous steam-heated vacuum secondary foaming device, comprising a secondary foaming kettle body A, a secondary foaming kettle body B, a secondary foaming kettle body C, a secondary foaming kettle body D and a feeding pipeline, wherein the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D are connected by a feeding pipeline, and a feeding pneumatic valve is arranged at one end of the feeding pipeline close to the secondary foaming kettle body A, and a vacuum tube is arranged at the top end of the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D, and a discharging pneumatic valve is arranged at the bottom end of the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D.
[0008] Preferably, the tank bodies of the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D are all provided with jackets, and the bottom ends of the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D are all provided with water vapor inlets, and the water vapor inlets are connected to the inner cavity of the jacket.
[0009] Preferably, the bottom ends of the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D are all provided with a stirrer.
[0010] Compared with the prior art, the present invention has the following beneficial effects:
[0011] In the present invention, the foamed polyurethane beads are produced by continuously vacuuming and steam heating the secondary foaming kettle body A, the secondary foaming kettle body B, the secondary foaming kettle body C and the secondary foaming kettle body D. The bulk density of the foamed polyurethane beads produced is 60 kg / m 3 Compared with the polyurethane foam beads produced by the prior art, the stability of the polyurethane foam beads is improved, and the polyurethane foam beads produced have light density, fine pores and excellent resilience. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0013] Figure 1 The present invention is a schematic diagram of the composition structure of a continuous steam heating vacuum secondary foaming device.
[0014] In the figure: 5, secondary foaming kettle body A; 51, secondary foaming kettle body B; 52, secondary foaming kettle body C; 53, secondary foaming kettle body D; 1, material conveying pipeline; 2, feed pneumatic valve; 3, vacuum tube; 4, jacket; 6, agitator; 7, water vapor inlet; 8, discharge pneumatic valve. DETAILED DESCRIPTION
[0015] 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.
[0016] Example: Figure 1As shown, the present invention provides a continuous steam heating vacuum secondary foaming device, including secondary foaming kettle body A5, secondary foaming kettle body B51, secondary foaming kettle body C52, secondary foaming kettle body D53 and a feed pipe 1, and polyurethane foam beads (bucket density of about 200kg / m) produced by supercritical carbon dioxide extrusion 3 ) is sucked into the secondary foaming kettle A5 through the feeding pipe 1, and the secondary foaming kettle A5, the secondary foaming kettle B51, the secondary foaming kettle C52 and the secondary foaming kettle D53 are connected through the feeding pipe 1, and a feeding pneumatic valve 2 is arranged at one end of the feeding pipe 1 close to the secondary foaming kettle A5. By setting the feeding pneumatic valve 2, the feeding pneumatic valve 2 can control the opening and closing of the feeding pipe 1, and the tops of the secondary foaming kettle A5, the secondary foaming kettle B51, the secondary foaming kettle C52 and the secondary foaming kettle D53 are all provided with a vacuum pipe 3. By setting the vacuum pipe 3, when the vacuum equipment and After the end of the vacuum tube 3 is connected, the inner cavity of the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53 can be evacuated through the vacuum equipment and the vacuum tube 3. The bottom ends of the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53 are all provided with a discharge pneumatic valve 8. By providing the discharge pneumatic valve 8, the discharge pneumatic valve 8 can control the discharge of the polyurethane foam beads in the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53.
[0017] A jacket 4 is provided on the tank body of the secondary foaming kettle A5, the secondary foaming kettle B51, the secondary foaming kettle C52 and the secondary foaming kettle D53, and a water vapor inlet 7 is provided at the bottom end of the secondary foaming kettle A5, the secondary foaming kettle B51, the secondary foaming kettle C52 and the secondary foaming kettle D53. The water vapor inlet 7 is connected to the inner cavity of the jacket 4. By setting the jacket 4 and the water vapor inlet 7, when the high-temperature water vapor equipment is connected to the end of the water vapor inlet 7, the high-temperature water vapor equipment can introduce high-temperature water vapor into the inner cavity of the jacket 4 through the water vapor inlet 7, thereby ensuring that the temperature of the secondary foaming kettle A5, the secondary foaming kettle B51, the secondary foaming kettle C52 and the secondary foaming kettle D53 is uniform and stable.
[0018] The bottom ends of the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53 are all provided with a stirrer 6. By providing the stirrer 6, the stirrer 6 can stir the polyurethane foam beads in the inner cavity of the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53, thereby ensuring that the polyurethane foam beads are evenly heated in the inner cavity of the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53.
[0019] Working principle: First, connect the external high-temperature steam equipment to the four steam inlets 7, and introduce the high-temperature steam into the inner cavities of the four jackets 4 to heat up the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53, and ensure that the temperatures of the secondary foaming kettle body A5, the secondary foaming kettle body B51, the secondary foaming kettle body C52 and the secondary foaming kettle body D53 are uniform and stable;
[0020] Subsequently, the feed pneumatic valve 2 and the four discharge pneumatic valves 8 are closed, and the vacuum pumping device is connected to the four vacuum pumping tubes 3. The vacuum pumping device and the corresponding vacuum pumping tube 3 are used to evacuate the secondary foaming kettle A5. When the negative pressure in the inner cavity of the secondary foaming kettle A5 reaches -0.3 bar, the feed pneumatic valve 2 is opened, and the polyurethane foam beads (bulk density of about 200 kg / m 2) produced by supercritical carbon dioxide extrusion are discharged. 3 ) is sucked into the secondary foaming kettle body A5 through the feeding pipe 1. After the feeding is completed, the feeding pneumatic valve 2 is closed and the vacuum is continuously drawn to maintain the vacuum degree of the inner cavity of the secondary foaming kettle body A5 at about -0.5 bar. The polyurethane foam particles with heavier bulk density will expand in the inner cavity of the secondary foaming kettle body A5. After maintaining for about 8 minutes, the pressure is slowly released to -0.3 bar;
[0021] Subsequently, the negative pressure in the inner cavity of the secondary foaming kettle body B51 is pumped down to -0.5 bar. At this time, a corresponding discharge pneumatic valve 8 is opened, and all the materials in the secondary foaming kettle body A5 are sucked into the inner cavity of the secondary foaming kettle body B51. The polyurethane foam beads are further expanded in the secondary foaming kettle body B51, and the negative pressure in the inner cavity of the secondary foaming kettle body B51 is maintained at -0.8 bar. After about 10 minutes, the pressure is slowly released to -0.3 bar.
[0022] Next, the negative pressure in the inner cavity of the secondary foaming kettle body C52 is pumped down to -0.5 bar. At this time, the corresponding discharge pneumatic valve 8 is opened, and all the materials in the secondary foaming kettle body B51 are sucked into the secondary foaming kettle body C52. The polyurethane foam beads are cooled and initially shaped in the secondary foaming kettle body C52. The negative pressure in the inner cavity of the secondary foaming kettle body C52 is maintained at -0.5 bar. After about 10 minutes, the pressure is slowly released to -0.2 bar.
[0023] Finally, the negative pressure in the inner cavity of the secondary foaming kettle D53 is pumped down to -0.3 bar. At this time, a corresponding pneumatic discharge valve 8 is opened, and all the materials in the secondary foaming kettle C52 are sucked into the secondary foaming kettle D53. The polyurethane foam beads are cooled and initially shaped in the secondary foaming kettle D53. The negative pressure of the secondary foaming kettle D53 is maintained at -0.5 bar for about 10 minutes, and then the pressure is slowly released to normal pressure. The pneumatic discharge valve 8 at the bottom of the secondary foaming kettle D53 is opened, and a bulk density of 60 kg / m 3 About 100% foamed polyurethane beads.
[0024] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A continuous steam-heated vacuum secondary foaming device, comprising a secondary foaming kettle body A (5), a secondary foaming kettle body B (51), a secondary foaming kettle body C (52), a secondary foaming kettle body D (53) and a feed pipe (1), characterized in that: The secondary foaming kettle body A (5), the secondary foaming kettle body B (51), the secondary foaming kettle body C (52) and the secondary foaming kettle body D (53) are connected by a feeding pipeline (1); a feeding pneumatic valve (2) is arranged at one end of the feeding pipeline (1) close to the secondary foaming kettle body A (5); a vacuum tube (3) is arranged at the top end of the secondary foaming kettle body A (5), the secondary foaming kettle body B (51), the secondary foaming kettle body C (52) and the secondary foaming kettle body D (53); and a discharging pneumatic valve (8) is arranged at the bottom end of the secondary foaming kettle body A (5), the secondary foaming kettle body B (51), the secondary foaming kettle body C (52) and the secondary foaming kettle body D (53).
2. A continuous steam heating vacuum secondary foaming device as claimed in claim 1, characterized in that: The tank bodies of the secondary foaming kettle body A (5), the secondary foaming kettle body B (51), the secondary foaming kettle body C (52) and the secondary foaming kettle body D (53) are all provided with a jacket (4), and the bottom ends of the secondary foaming kettle body A (5), the secondary foaming kettle body B (51), the secondary foaming kettle body C (52) and the secondary foaming kettle body D (53) are all provided with a water vapor inlet (7), and the water vapor inlet (7) is connected to the inner cavity of the jacket (4).
3. A continuous steam heating vacuum secondary foaming device as claimed in claim 1, characterized in that: A stirrer (6) is provided at the bottom of the secondary foaming kettle body A (5), the secondary foaming kettle body B (51), the secondary foaming kettle body C (52) and the secondary foaming kettle body D (53).