Single-door polyurethane energy-absorbing vibration-reducing anti-collision door stopper and preparation method thereof

Abstract

The invention relates to a single-door polyurethane energy-absorbing vibration-reducing anti-collision door stopper and a preparation method thereof, and belongs to the technical field of home building material industry. According to the integrally-formed polyurethane energy-absorbing vibration-reducing anti-collision door stopper, the foaming expansion stability of the component A and the component B is good, so that the surface flatness of the polyurethane energy-absorbing sphere is excellent, and no obvious depression or deformation exists. The magnets are embedded into the polyurethane ball body in a full-wrapping mode. According to the design, under the action of impact load, the polyurethane energy-absorbing ball body can fully utilize the viscoelasticity characteristic, impact kinetic energy is more effectively converted into heat energy, the heat energy is dissipated, and therefore the efficient energy-absorbing process is achieved.

Description

Technical Field

[0001] The invention relates to a single-door polyurethane energy-absorbing, vibration-damping and anti-collision door stopper and a preparation method thereof, belonging to the technical field of home building materials industry. Background Art

[0002] Traditional single-door anti-collision door catchers are designed to ensure door safety and effectively reduce collision damage. Their basic structure consists of a suction plate and a magnet. However, in actual use, due to the lack of a buffering mechanism, the collision between the magnet and the suction plate produces noise. The impact force is directly transmitted to the fragile wall, which can easily damage the wall and render the door catch ineffective. Furthermore, reinstallation requires repairing the wall, which is very cumbersome. Therefore, it is necessary to improve traditional door catchers to reduce the negative effects of impact vibration and noise generated during door opening and closing. Summary of the Invention

[0003] The technical solution of this invention is to address the negative impacts of collisions during the use of door catches by proposing a polyurethane energy-absorbing, vibration-damping, and anti-collision door catch for single doors and its preparation method. By combining the polyurethane energy-absorbing and vibration-damping material with the door catch product, when the door is subjected to an impact, the polyurethane energy-absorbing and vibration-damping material, due to its unique molecular structure and physical properties, can quickly and efficiently absorb the impact energy, thereby effectively mitigating the adverse effects of the impact on the door, wall, and the door catch itself. The application of this material provides a new solution for optimizing the performance of door catches and enhancing their overall effectiveness, helping to overcome the limitations of traditional door catches in practical applications.

[0004] The technical solution of the present invention is:

[0005] A polyurethane energy-absorbing, vibration-damping, and anti-collision door catch for a single door, comprising a suction plate assembly and a magnet assembly;

[0006] The suction plate assembly is a core-shell structure, with the core part being an iron block and the shell part being an energy-absorbing and vibration-reducing polyurethane elastomer;

[0007] The magnet assembly is a core-shell structure, with the core being the magnet and the shell being an energy-absorbing and vibration-reducing polyurethane elastomer.

[0008] The core part of the magnet assembly is a spherical structure with a diameter of 25-30mm, and the shell part has a gradient thickness, with a minimum thickness of 4-5mm and a maximum thickness of 8-10mm;

[0009] The center of the iron block of the core part of the suction plate assembly has a spherical notch, and the shape of the shell part is consistent with the spherical notch;

[0010] The spherical notch of the shell portion in the suction plate assembly matches the shell portion at the smallest thickness in the magnet assembly;

[0011] The core part of the suction plate assembly has a length of 38-40 mm, a height of 18-20 mm, and a width of 8-10 mm;

[0012] The thickness of the shell part of the suction plate assembly is 5-8mm;

[0013] The raw materials for preparing the energy-absorbing and vibration-damping polyurethane elastomer include component A and component B;

[0014] The raw materials of the A component include polyether polyol PTMEG1000, PTMEG650, Dow 2070 polyether polyol, chain extender 1,4-butanediol (BDO), dibutyltin dilaurate (T12) and color paste;

[0015] Taking the total mass of raw materials of component A as 100%, the components and their mass fractions are as follows:

[0016]

[0017] The foam leveling agent is a foam leveling agent with the brand name AK7703 produced by Jiangsu Meiside Company;

[0018] The color paste is Milliken X3LV brand blue color paste;

[0019] The balance catalyst is a polyurethane catalyst with the brand name PC-77 produced by Shanghai Deyin Chemical Co., Ltd.

[0020] Mixing the raw materials of component A to obtain component A;

[0021] The B component is a prepolymer having an -NCO value of 18.5-19 formed by reacting isocyanate with polyether polyol PTMEG1000 or polyether polyol PTMEG650 at 80-100° C. in a protective gas atmosphere for 4-6 hours.

[0022] The molar ratio of the active -H contained in component A (the sum of the active -H in the polyol -OH and the active -H in H2O) to the -NCO group contained in component B is 1.00:0.90-0.95.

[0023] A method for preparing a single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, the method comprising the following steps:

[0024] The first step is to prepare the suction plate assembly female mold and the suction plate assembly female mold cover, and preheat them to 50-60°C, then evenly apply a release agent on the inner surface of the suction plate assembly female mold and the inner surface of the suction plate assembly female mold cover. Prepare the magnet assembly female mold and the magnet assembly female mold cover, and preheat them to 50-60°C, then evenly apply a release agent on the inner surface of the magnet assembly female mold and the inner surface of the magnet assembly female mold cover.

[0025] The second step is to place the iron block in the female mold of the suction plate assembly and the magnet in the female mold of the magnet assembly;

[0026] Step 3: Preheat component A to 30-35°C and component B to 40-45°C;

[0027] In the fourth step, the preheated component A and the preheated component B in the third step are stirred and mixed using a two-component polyurethane pouring machine, and then poured into the mold cavity of the suction plate assembly female mold where the iron block is placed in the second step for foaming and expansion. After 15-20 seconds, the foaming and expansion begin to be stable. Then, the upper cover of the suction plate assembly female mold is closed. After aging for 10-15 minutes, the mold is opened to take out the finished product, and then it is aged at room temperature for 2-3 days to obtain the suction plate assembly.

[0028] The preheated component A and the preheated component B in the third step are stirred and mixed using a two-component polyurethane pouring machine and then poured into the mold cavity of the suction plate assembly female mold where the magnet is placed in the second step for foaming and expansion. After 15-20 seconds, the foaming and expansion begin to proceed steadily. Then, the upper cover of the magnet assembly female mold is closed. After aging for 10-15 minutes, the mold is opened to take out the finished product, and then it is aged at room temperature for 2-3 days to obtain the magnet assembly.

[0029] Beneficial effects

[0030] (1) The one-piece molded polyurethane energy-absorbing, vibration-damping and anti-collision door stopper of the present invention has magnets pre-embedded in the energy-absorbing, vibration-damping polyurethane elastomer material, which can be cast in one step, thus avoiding the secondary processing of cutting and bonding in the later stage. The advantage is that the preparation process of the one-piece molded polyurethane energy-absorbing, vibration-damping and anti-collision door stopper is simple and fast, and can be mass-produced in factories.

[0031] (2) The one-piece molded polyurethane energy-absorbing, vibration-damping and anti-collision door stopper of the present invention has excellent specific energy absorption, resistance to high-intensity vibration impact, wear resistance, aging resistance, creep resistance, corrosion resistance and the like, and has a long service life.

[0032] (3) In the one-piece molded polyurethane energy-absorbing, vibration-damping and anti-collision door stopper of the present invention, in conventional application scenarios, the magnetic energy density output by the commonly used magnets when they work is in the range of 263-422 kJ / m 2 Energy-absorbing and vibration-damping polyurethane elastomers, as a type of material with special energy absorption properties, have an energy absorption capacity of 100-800kJ / mm 2 After comprehensive evaluation, the energy absorption capacity of the energy-absorbing and vibration-damping polyurethane elastomer is fully consistent with the requirements of the magnetic door catch under actual working conditions in terms of magnitude and range, ensuring that the magnetic door catch can perform its functions stably and reliably under various operating conditions.

[0033] (4) In the one-piece molded polyurethane energy-absorbing, vibration-damping and anti-collision door stopper of the present invention, the structural characteristics of the polyurethane microporous material itself will be compressed and deformed when subjected to external pressure, just like small springs, which can more effectively absorb and disperse the impact force, making the door closing process smoother and reducing vibration and noise.

[0034] (5) In the one-piece polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper of the present invention, the foaming and expansion of components A and B are smooth, resulting in an excellent surface flatness of the polyurethane energy-absorbing sphere, without obvious dents or deformation. The magnet is fully embedded in the polyurethane sphere. This design enables the polyurethane energy-absorbing sphere to fully utilize its viscoelastic properties under the action of impact loads, more effectively converting impact kinetic energy into heat energy and dissipating it, thereby achieving a highly efficient energy absorption process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the magnet assembly;

[0036] Figure 2 Schematic diagram of the suction plate assembly. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] Example

[0039] like Figure 1 and Figure 2 As shown, a single-door polyurethane energy-absorbing, vibration-damping and anti-collision door stopper includes a suction plate assembly and a magnet assembly;

[0040] The suction plate assembly is a core-shell structure, with the core part being an iron block and the shell part being an energy-absorbing and vibration-reducing polymer elastomer;

[0041] The magnet assembly is a core-shell structure, with the core being the magnet and the shell being an energy-absorbing and vibration-reducing polymer elastomer.

[0042] The core part of the magnet assembly is a spherical structure with a diameter of 28mm, and the shell part has a gradient thickness, with a minimum thickness of 5mm and a maximum thickness of 10mm;

[0043] The center of the iron block of the core part of the suction plate assembly has a spherical notch, and the shape of the shell part is consistent with the spherical notch;

[0044] The spherical notch of the shell portion in the suction plate assembly matches the shell portion at the smallest thickness in the magnet assembly;

[0045] The core part of the suction plate assembly has a length of 40 mm, a height of 20 mm, and a width of 10 mm;

[0046] The thickness of the shell part of the suction plate assembly is 5mm;

[0047] The raw materials for preparing the energy-absorbing and vibration-damping polymer elastomer include component A and component B;

[0048] The raw materials of the A component include polyether polyol PTMEG1000, PTMEG650, Dow 2070 polyether polyol, chain extender 1,4-butanediol (BDO), dibutyltin dilaurate (T12) and color paste;

[0049] Taking the total mass of raw materials of component A as 100%, the components and their mass fractions are as follows:

[0050]

[0051] The foam leveling agent is a foam leveling agent with the brand name AK7703 produced by Jiangsu Meiside Company;

[0052] The color paste is Milliken X3LV brand blue color paste;

[0053] The balance catalyst is a polyurethane catalyst with the brand name PC-77 produced by Shanghai Deyin Chemical Co., Ltd.

[0054] Mixing the raw materials of component A to obtain component A;

[0055] The B component is a prepolymer having an -NCO value between 18.5 and 19 formed by reacting isocyanate with polyether polyol PTMEG1000 and polyether polyol PTMEG650 at 85° C. in a nitrogen atmosphere for 4 hours.

[0056] The molar ratio of the active -H contained in component A (the sum of the active -H in the polyol -OH and the active -H in H2O) to the -NCO group contained in component B is 1.00:0.95.

[0057] A method for preparing a single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, the method comprising the following steps:

[0058] The first step is to prepare a suction plate assembly female mold and a suction plate assembly female mold cover, and preheat them to 60°C before evenly applying a release agent on the inner surface of the suction plate assembly female mold and the inner surface of the suction plate assembly female mold cover. The second step is to prepare a magnet assembly female mold and a magnet assembly female mold cover, and preheat them to 60°C before evenly applying a release agent on the inner surface of the magnet assembly female mold and the inner surface of the magnet assembly female mold cover.

[0059] The second step is to place the iron block in the female mold of the suction plate assembly and the magnet in the female mold of the magnet assembly;

[0060] Step 3: Preheat component A to 35°C and component B to 45°C;

[0061] In the fourth step, the preheated component A and the preheated component B in the third step are stirred and mixed using a two-component polyurethane pouring machine, and then poured into the mold cavity of the suction plate assembly female mold where the iron block is placed in the second step for foaming and expansion. After 18 seconds, the foaming and expansion begins steadily, and then the upper cover of the suction plate assembly female mold is closed. After aging for 15 minutes, the mold is opened to remove the finished product, and then after aging at room temperature for 3 days, the suction plate assembly is obtained;

[0062] The preheated component A and the preheated component B in the third step are stirred and mixed using a two-component polyurethane pouring machine and then poured into the mold cavity of the suction plate assembly female mold where the magnet is placed in the second step for foaming and expansion. After 20 seconds, the foaming and expansion begin to proceed steadily. Then, the upper cover of the magnet assembly female mold is closed. After aging for 15 minutes, the mold is opened to take out the finished product. After aging at room temperature for 3 days, the magnet assembly is obtained.

[0063] The obtained suction plate assembly was installed on the wall surface, and the magnet assembly was installed on the door of the same height, and the performance of the polyurethane energy-absorbing, vibration-damping and anti-collision door suction was tested.

[0064] The energy absorption performance of the door suction is 800KJ / mm 2 The impact resistance reaches 18%. The energy-absorbing and vibration-reducing polymer elastomer effectively eliminates damage to the wall and door stopper materials caused by applied forces, as well as noise caused by vibration. Durability testing of the assembled door stopper showed an operating force of 30-50N after 100,000 opening and closing cycles. Compared to a door stopper structure without the elastomer, which has an operating force of 70-80N after 50,000 opening and closing cycles, the product's service life has been significantly extended. Performance testing of the energy-absorbing and vibration-reducing polymer elastomer showed a tensile strength of 3.8MPa, an elongation at break of 147.7%, and a flame retardancy rating of B2. Its high strength and elongation allow it to withstand even greater external impacts.

[0065] In summary, 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, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, characterized by: The door stopper comprises a suction plate assembly and a magnet assembly; The suction plate assembly is a core-shell structure, with the core part being an iron block and the shell part being an energy-absorbing and vibration-reducing polyurethane elastomer; The magnet assembly is a core-shell structure, with the core being the magnet and the shell being an energy-absorbing and vibration-reducing polyurethane elastomer. The outer shape of the shell portion in the suction plate assembly matches the shell portion at the smallest thickness in the magnet assembly.

2. The single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 1, characterized in that: The core part of the magnet assembly is a spherical structure with a diameter of 25-30mm, and the shell part has a gradient thickness, with a minimum thickness of 4-5mm and a maximum thickness of 8-10mm; The center of the iron block of the core part of the suction plate assembly has a spherical notch, and the shape of the shell part is consistent with the spherical notch; The spherical notch of the shell part in the suction plate assembly matches the shell part at the smallest thickness in the magnet assembly.

3. The single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 2, characterized in that: The core part of the suction plate assembly has a length of 38-40 mm, a height of 18-20 mm, and a width of 8-10 mm; The thickness of the shell part of the suction plate assembly is 5-8 mm.

4. A single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to any one of claims 1 to 3, characterized in that: The raw materials for preparing the energy-absorbing and vibration-damping polyurethane elastomer include component A and component B; The raw materials of component A include polyether polyol PTMEG1000, PTMEG650, Dow 2070 polyether polyol, chain extender 1,4-butanediol, dibutyltin dilaurate and color paste; Taking the total mass of raw materials of component A as 100%, the components and their mass fractions are as follows:

5. The single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 4, characterized in that: The foam leveling agent is a foam leveling agent with the brand name AK7703 produced by Jiangsu Meiside Company; The color paste is Milliken X3LV brand blue color paste; The balance catalyst is a polyurethane catalyst with the brand name PC-77 produced by Shanghai Deyin Chemical Co., Ltd.

6. The single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 1, characterized in that: Component A is obtained by mixing the raw materials of component A.

7. The single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 1, characterized in that: The B component is a prepolymer having an -NCO value of 18.5-19 formed by reacting isocyanate with polyether polyol PTMEG1000 or polyether polyol PTMEG650 at 80-100° C. in a protective gas atmosphere for 4-6 hours. The molar ratio of the active -H contained in component A (the sum of the active -H in the polyol -OH and the active -H in H2O) to the -NCO group contained in component B is 1.00:0.90-0.

95.

8. A method for preparing a single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, characterized in that The steps of the method include: The first step is to prepare a suction plate assembly female mold and a suction plate assembly female mold cover, preheat them, and then evenly apply a release agent on the inner surface of the suction plate assembly female mold and the inner surface of the suction plate assembly female mold cover; Prepare a magnet assembly female mold and a magnet assembly female mold cover, preheat them, and then evenly apply a release agent on the inner surface of the magnet assembly female mold and the inner surface of the magnet assembly female mold cover; The second step is to place the iron block in the female mold of the suction plate assembly and the magnet in the female mold of the magnet assembly; The third step is to preheat components A and B; In the fourth step, the preheated component A and the preheated component B in the third step are stirred and mixed using a two-component polyurethane pouring machine, and then poured into the mold cavity of the suction plate assembly female mold where the iron block is placed in the second step for foaming and expansion. After stable foaming and expansion, the upper cover of the suction plate assembly female mold is closed and matured. After the maturity is completed, the mold is opened to take out the finished product, and then matured at room temperature to obtain the suction plate assembly; The preheated component A and the preheated component B in the third step are stirred and mixed using a two-component polyurethane pouring machine and then poured into the mold cavity of the suction plate assembly female mold where the magnet is placed in the second step for foaming and expansion. After stable foaming and expansion, the upper cover of the magnet assembly female mold is closed and matured. After the maturity is completed, the mold is opened to take out the finished product, and then matured at room temperature to obtain the magnet assembly.

9. The method for preparing a single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 8, characterized in that: In the first step, the preheating temperature of the suction plate assembly female mold, the suction plate assembly female mold upper cover, the magnet assembly female mold and the magnet assembly female mold upper cover is 50-60° C. In the third step, the preheating temperature of component A is 30-35°C, and the preheating temperature of component B is 40-45°C.

10. The method for preparing a single-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 8, characterized in that: In the fourth step, the aging time before the mold is opened and the finished product is taken out is 10-15 minutes, and the aging time after the mold is opened and the finished product is taken out is 2-3 days.

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