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

Abstract

The invention relates to a double-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 double-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] Double-door anti-collision door catches play a crucial role in ensuring door safety and mitigating collision damage. They are primarily used in commercial spaces, residential environments, and various public buildings. The sturdy frame of these catches is typically constructed of metal, providing strong mechanical strength and excellent durability. However, in actual use, the magnets and the catch plate can collide and rebound, leading to instability. This process not only creates inconvenience and noise, but also can damage and deform the door frame due to repeated collisions over time. Summary of the Invention

[0003] The technical solution of the present invention is to solve the problems of collision, rebound and instability during the use of door suction cups. A double-door polyurethane energy-absorbing, vibration-damping and anti-collision door suction cup and its preparation method are proposed. The cup is coated with a polymer. When the door body is subjected to external impact force, the polymer elastomer relies on its unique molecular structure and physical properties to absorb the impact energy quickly and efficiently, thereby effectively reducing the damage suffered by the door body during the collision, thereby improving the overall performance and user experience of the door suction cup device, and providing a feasible optimization solution to address the limitations of traditional door suction cups.

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

[0005] A double-door polyurethane energy-absorbing, vibration-damping, and anti-collision door catcher comprises a magnet and an energy-absorbing, vibration-damping polyurethane elastomer. The magnet is a rectangular parallelepiped structure, the energy-absorbing, vibration-damping polyurethane elastomer is coated on the outside of the five surfaces of the magnet, and the uncovered surfaces are connected to the sides of the double-door.

[0006] The magnet has a length of 2100-2500 mm, a width of 25-40 mm, and a height of 8-12 mm.

[0007] The thickness of the energy-absorbing and vibration-reducing polyurethane elastomer coated on the outside of the magnet is 4-5 mm.

[0008] The raw materials for preparing the energy-absorbing and vibration-damping polyurethane elastomer include component A and component B;

[0009] 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;

[0010] Taking the total mass of raw materials of component A as 100%, the mass fractions of each component are as follows:

[0011]

[0012] The foam leveling agent is a foam leveling agent with the brand name AK7703 produced by Jiangsu Meiside Company;

[0013] The color paste is Milliken X3LV brand blue color paste;

[0014] The balance catalyst is a polyurethane catalyst with the brand name PC-77 produced by Shanghai Deyin Chemical Co., Ltd.

[0015] Mixing the raw materials of component A to obtain component A;

[0016] 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.

[0017] 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.

[0018] A method for preparing a double-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, the method comprising the following steps:

[0019] The first step is to prepare the door stopper mold and the door stopper mold cover, and then preheat them to 50-60°C and evenly apply a release agent on the inner surface of the door stopper mold and the inner surface of the door stopper mold cover;

[0020] The second step is to hang the magnet into the door catch female mold;

[0021] Step 3: Preheat component A to 30-35°C and component B to 40-45°C;

[0022] The fourth step is to use a two-component polyurethane pouring machine to mix the preheated component A and the preheated component B in the third step, and then pour them into the mold cavity of the door stopper female mold with a magnet suspended in the second step for foaming and expansion. After 15-20 seconds, it will start to foam and expand steadily, and then close the upper cover of the door stopper female mold. After aging for 10-15 minutes, open the mold and take out the finished product, and then mature it at room temperature for 2-3 days to obtain the door stopper.

[0023] Beneficial effects

[0024] (1) The one-piece polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper of the present invention features an innovative design. Magnets are pre-embedded within the polymer elastomer, allowing for a single casting process without the need for subsequent cutting or gluing. Its simple and efficient preparation process facilitates mass production in factories, improving production efficiency while reducing costs. It is a high-quality, cost-effective product.

[0025] (2) The one-piece polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper of the present invention has excellent performance and outstanding specific energy absorption characteristics, and can effectively resist high-intensity vibration and impact. At the same time, it also has good wear resistance, aging resistance, creep resistance, and corrosion resistance. It has stable performance and a long service life during long-term use, and can provide users with long-term reliable protection.

[0026] (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 magnet when it works is 263-422 kJ / m 2 Energy-absorbing elastomers are a type of material with special energy absorption properties. Their energy absorption capacity is 100-800kJ / mm 2 After comprehensive evaluation, it was determined that the energy absorption capacity of the buffering energy-absorbing elastomer, both in terms of magnitude and range, perfectly matches the actual operating requirements of the magnetic door catch under actual working conditions, thus ensuring that the magnetic door catch can operate stably and reliably under various operating conditions and perform its due functions.

[0027] (4) In the one-piece molded polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper of the present invention, the polyurethane microporous material has unique structural properties. When it is subjected to external pressure, it undergoes compression deformation. This property enables it to efficiently absorb and disperse impact force, making the door more stable and smooth during closing, effectively reducing vibration and noise, avoiding collision rebound and looseness, and providing users with a more comfortable and quiet user experience.

[0028] (5) In the one-piece molded polyurethane energy-absorbing, vibration-damping and anti-collision door stopper of the present invention, component A and component B have excellent stability during foaming and expansion, which makes the polyurethane energy-absorbing sphere have excellent surface flatness, and there is no obvious depression or deformation on the surface of the sphere. In terms of structural design, the magnet is completely wrapped and embedded in the polyurethane sphere. The advantage of such a design is that when subjected to impact loads, the polyurethane energy-absorbing sphere can give full play to its own viscoelastic properties, convert the impact kinetic energy into heat energy more efficiently and dissipate it, thereby achieving an efficient energy absorption process and effectively improving the energy absorption, vibration reduction and anti-collision effects of the door stopper. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the door stopper structure.

[0030] Figure 2 This is a schematic diagram of a double door. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Example

[0033] like Figure 1 and Figure 2 As shown, a double-door polyurethane energy-absorbing, vibration-damping and anti-collision door catch includes a magnet and an energy-absorbing, vibration-damping polyurethane elastomer. The magnet is a rectangular structure, and the energy-absorbing, vibration-damping polyurethane elastomer is coated on the outside of the five surfaces of the magnet. The uncovered surface is connected to the side of the double door.

[0034] The magnet is 2200 mm long, 30 mm wide and 10 mm high.

[0035] The thickness of the energy-absorbing and vibration-damping polyurethane elastomer coating the outside of the magnet is 5 mm.

[0036] The raw materials for preparing the energy-absorbing and vibration-damping polyurethane elastomer include component A and component B;

[0037] 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;

[0038] Taking the total mass of raw materials of component A as 100%, the mass fractions of each component are as follows:

[0039]

[0040] The foam leveling agent is a foam leveling agent with the brand name AK7703 produced by Jiangsu Meiside Company;

[0041] The color paste is Milliken X3LV brand blue color paste;

[0042] The balance catalyst is a polyurethane catalyst with the brand name PC-77 produced by Shanghai Deyin Chemical Co., Ltd.

[0043] Mixing the raw materials of component A to obtain component A;

[0044] The B component is a prepolymer having an -NCO value between 18.5 and 19 formed by reacting isocyanate with polyether polyol PTMEG1000 or polyether polyol PTMEG650 at 85° C. in a protective gas atmosphere for 5 hours with stirring;

[0045] 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.

[0046] A method for preparing a double-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, the method comprising the following steps:

[0047] The first step is to prepare the door stopper mold and the door stopper mold cover, and then preheat them to 50-60°C and evenly apply a release agent on the inner surface of the door stopper mold and the inner surface of the door stopper mold cover;

[0048] The second step is to hang the magnet into the door catch female mold;

[0049] Step 3: Preheat component A to 35°C and component B to 40°C;

[0050] The fourth step is to use a two-component polyurethane pouring machine to mix the preheated component A and the preheated component B in the third step, and then pour them into the mold cavity of the door stopper female mold with a magnet suspended in the second step for foaming and expansion. After 20 seconds, it will start to foam and expand steadily, and then close the upper cover of the door stopper female mold. After aging for 15 minutes, open the mold and take out the finished product. After aging at room temperature for 3 days, the door stopper is obtained.

[0051] The obtained door catch was installed on the side of the door body, and the door catch was installed on the door of the same height, and the performance of the polyurethane energy-absorbing, vibration-damping and anti-collision door catch was tested.

[0052] The energy absorption performance of the door suction is 785KJ / mm 2 , impact resistance reaches 20%, and the energy-absorbing and vibration-reducing polymer elastomer effectively solves problems such as collision rebound and instability caused by strong forces. The durability test of the installed door stopper shows that the operating force of 100,000 opening and closing movements is 25-40N (no rebound). Compared with the door stopper structure without elastomer, the operating force of 50,000 opening and closing movements is 15-25N (easy to rebound), which significantly enhances the service life of the product. The performance test of the energy-absorbing and vibration-reducing polymer elastomer shows a tensile strength of 4MPa, an elongation at break of 148.5%, and a flame retardant grade of B2. The high strength and elongation enable it to withstand greater external impact.

[0053] 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 double-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper, characterized by: The door catch includes a magnet and an energy-absorbing and vibration-damping polyurethane elastomer. The magnet is a rectangular parallelepiped structure. The energy-absorbing and vibration-damping polyurethane elastomer is coated on the five surfaces of the magnet, and the uncovered surface is connected to the side of the double-opening door.

2. The double-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 1, characterized in that: The magnet has a length of 2100-2500 mm, a width of 25-40 mm, and a height of 8-12 mm.

3. The double-door polyurethane energy-absorbing, vibration-damping, and anti-collision door stopper according to claim 2, characterized in that: The thickness of the energy-absorbing and vibration-reducing polyurethane elastomer coated on the outside of the magnet is 4-5 mm.

4. A double-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 mass fractions of each component are as follows: 。 5. The double-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 double-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 double-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 to the -NCO group contained in component B is 1.00:0.90-0.95; The active -H contained in component A refers to the sum of the active -H in the -OH of the polyol and the active -H in H2O.

8. A method for preparing a double-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 the door stopper mold and the door stopper mold cover, and evenly apply the release agent on the inner surface of the door stopper mold and the inner surface of the door stopper mold cover after preheating to 50-60°C; The second step is to hang the magnet into the door catch female mold; Step 3: Preheat component A to 30-35°C and component B to 40-45°C; The fourth step is to use a two-component polyurethane pouring machine to mix the preheated component A and the preheated component B in the third step, and then pour them into the mold cavity of the door stopper female mold with a magnet suspended in the second step for foaming and expansion. After 15-20 seconds, it will start to foam and expand steadily, and then close the upper cover of the door stopper female mold. After aging for 10-15 minutes, open the mold and take out the finished product, and then mature it at room temperature for 2-3 days to obtain the door stopper.

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