Low-temperature thermoplastic polyurethane elastic composite particle

Abstract

The utility model discloses a low-temperature thermoplastic polyurethane elastic composite particle, and particularly relates to the technical field of application of thermoplastic polyurethane, which comprises a core layer, a cross-linking layer wrapped outside the core layer, a shell layer wrapped outside the cross-linking layer, a flame-retardant layer wrapped outside the shell layer, and an anti-oxidation layer arranged on the outer surface of the flame-retardant layer. The composite particle designed by the utility model can still keep excellent elasticity and rebound resilience at low temperature, the flexibility and durability of the particle at low temperature are ensured, and excellent mechanical strength and wear resistance are provided, so that the particle can bear larger pressure and friction force, the flame retardant property of the particle is improved, and the service life of the particle is prolonged. According to the utility model, the fire-proof material has better safety under dangerous conditions such as fire disasters and the like, so that the risk of fire spread can be reduced, drippings generated by combustion are reduced, and secondary injuries such as scalds and the like are avoided; and meanwhile, performance reduction caused by oxidation of the material is effectively prevented, and the performance stability of the particles in the long-term use process is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of application of thermoplastic polyurethane, and more specifically, to low-temperature thermoplastic polyurethane elastic composite particles. Background Art

[0002] With the continuous advancement of materials science, thermoplastic polyurethane elastomer (TPU) has been widely used in many fields due to its unique physical and chemical properties. TPU is a block copolymer composed of alternating soft segments and hard segments, in which the soft segment provides elasticity and the hard segment contributes to strength and wear resistance. TPU has the dual properties of rubber and plastic, which means it can be molded by thermoplastic processing technology and has good elasticity and wear resistance.

[0003] In low temperature environments, traditional thermoplastic polyurethane elastomers may become hard and brittle, resulting in decreased performance. Therefore, in order to meet the needs of use in cold or freezing conditions, it is necessary to develop thermoplastic polyurethane elastomer composite particles with excellent low temperature performance. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides low-temperature thermoplastic polyurethane elastic composite particles.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: low-temperature thermoplastic polyurethane elastic composite particles, including a core layer, the outside of the core layer is wrapped with a cross-linked layer, the outside of the cross-linked layer is wrapped with an outer shell layer, the outside of the outer shell layer is wrapped with a flame retardant layer, and the outer surface of the flame retardant layer is provided with an anti-oxidation layer.

[0006] As a further improvement of the technical solution of the utility model, the core layer is a component made of polytetramethylene glycol.

[0007] As a further improvement of the technical solution of the utility model, the cross-linking layer is a component made of diisocyanate material.

[0008] As a further improvement of the technical solution of the utility model, the outer shell layer is a component made of a modified thermoplastic polyurethane material.

[0009] As a further improvement of the technical solution of the utility model, the flame retardant layer is a component made of a phosphate-based organic flame retardant material.

[0010] As a further improvement of the technical solution of the utility model, the anti-oxidation layer is a material component of a phosphite antioxidant.

[0011] Beneficial effects of the utility model:

[0012] The design of the core layer and the cross-linking layer in the utility model enables the particles to maintain excellent elasticity and resilience at low temperatures. Soft segment materials such as polytetramethylene glycol ensure the flexibility and durability of the particles under low temperature conditions. The cross-linking layer enhances the structural stability of the particles through chemical cross-linking points, provides excellent mechanical strength and wear resistance, and enables the particles to withstand greater pressure and friction. The outer shell layer effectively protects the internal layers from erosion by external environments such as moisture, oxygen, and ultraviolet rays, thereby extending the service life of the particles. The addition of the flame retardant layer significantly improves the flame retardant properties of the particles, making them safer in dangerous situations such as fire, which can reduce the risk of fire spread and reduce dripping produced by combustion, thereby avoiding secondary injuries such as burns. The antioxidant layer effectively prevents the performance degradation of the material due to oxidation, ensuring the stability of the performance of the particles during long-term use, that is, the five-layer composite particles designed in this scheme have achieved significant improvements in low-temperature performance, mechanical strength, environmental resistance, flame retardancy and oxidation resistance, and are suitable for use in various harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a cross-sectional view of the spherical particles of the utility model.

[0015] Figure 3 It is a cross-sectional view of the columnar particles of the utility model.

[0016] The reference numerals are: 1, core layer; 2, cross-linking layer; 3, outer shell layer; 4, flame retardant layer; 5, anti-oxidation layer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] As attached Figure 1-3 The low-temperature thermoplastic polyurethane elastic composite particles shown include a core layer 1, the core layer 1 is wrapped with a cross-linked layer 2 on the outside, the cross-linked layer 2 is wrapped with an outer shell layer 3 on the outside, the outer shell layer 3 is wrapped with a flame retardant layer 4 on the outside, and the outer surface of the flame retardant layer 4 is provided with an anti-oxidation layer 5.

[0019] As attached Figure 1-3As shown, preferably, the core layer 1 is provided with a soft segment composed of polytetramethylene ether glycol (PTMEG) or other similar polyether or polyester polyols, which mainly provides elasticity to ensure that the particles can still maintain good flexibility and resilience at low temperatures.

[0020] As attached Figure 1-3 As shown, preferably, the cross-linked layer 2 provided contains chemical cross-linking points, which are formed by hard segments composed of diisocyanates and small molecule diols, etc., and are mainly used to enhance the structural stability of the particles so that they are not easily deformed or damaged when subjected to external forces, that is, the durability and mechanical properties of the particles are improved.

[0021] As attached Figure 1-3 As shown, preferably, the outer shell layer 3 is composed of a modified thermoplastic polyurethane (TPU) having excellent low temperature resistance, and is mainly used to protect the inner layer from erosion by the external environment (such as moisture, oxygen, ultraviolet rays, etc.), while providing additional mechanical strength and wear resistance, that is, the outer shell layer 3 enhances the durability of the particles and enables them to remain stable for a long time in harsh environments.

[0022] As attached Figure 1-3 As shown, preferably, the flame retardant layer 4 is a phosphate-based organic flame retardant material component, which can promote the formation of a carbon layer on the surface of the material during combustion, isolate oxygen and heat, and thus play a flame retardant role.

[0023] As attached Figure 1-3 As shown, preferably, the antioxidant layer 5 is a material component of a phosphite antioxidant. The antioxidant layer 5 can react with peroxide to generate stable compounds, thereby inhibiting the oxidation reaction and further increasing the antioxidant performance of the composite particles.

[0024] It should be noted that the instruction manual is attached Figure 1-2 It is designed with composite particles as spherical structure. Figure 3 The columnar structure is designed with composite particles. In practical applications, it can also be designed into a flat or rectangular structure that is convenient for slicing and forming according to needs. Similarly, the thickness of each layer is not specifically limited in this technical solution and can be prepared according to actual needs.

[0025] Working principle: This utility model designs low-temperature thermoplastic polyurethane elastic composite particles, the specific structure is as shown in the attached manual Figure 1-3As shown, the central part of the low-temperature thermoplastic polyurethane elastic composite particles designed in the technical solution is a core layer 1, the core layer 1 is wrapped with a cross-linking layer 2, the cross-linking layer 2 is wrapped with an outer shell layer 3, the outer shell layer 3 is wrapped with a flame retardant layer 4, and the outer surface of the flame retardant layer 4 is provided with an antioxidant layer 5. The design of the core layer 1 and the cross-linking layer 2 in the utility model enables the particles to maintain excellent elasticity and resilience at low temperatures. Soft segment materials such as polytetramethylene glycol ensure the flexibility and durability of the particles under low temperature conditions. The cross-linking layer 2 enhances the structural stability of the particles through chemical cross-linking points, provides excellent mechanical strength and wear resistance, and enables the particles to withstand greater pressure and friction; the outer shell layer 3 effectively protects the internal layers from erosion by external environments such as moisture, oxygen, and ultraviolet rays, thereby extending the service life of the particles; the addition of the flame retardant layer 4 significantly improves the flame retardant properties of the particles, making them safer in dangerous situations such as fire, which can reduce the risk of fire spread and reduce dripping produced by combustion, thereby avoiding secondary injuries such as burns; the antioxidant layer 5 effectively prevents the performance degradation of the material due to oxidation, ensuring the stability of the performance of the particles during long-term use, that is, the five-layer composite particles designed in this scheme have achieved significant improvements in low-temperature performance, mechanical strength, environmental resistance, flame retardancy and oxidation resistance, and are suitable for use in various harsh environments.

[0026] Among them, the drawings of the embodiments disclosed in the present utility model only involve structures related to the embodiments disclosed in the present utility model, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0027] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. Low-temperature thermoplastic polyurethane elastic composite particles, characterized in that: The invention comprises a core layer (1), the core layer (1) is wrapped with a cross-linked layer (2) on the outside, the cross-linked layer (2) is wrapped with an outer shell layer (3) on the outside, the outer shell layer (3) is wrapped with a flame retardant layer (4) on the outside, and the outer surface of the flame retardant layer (4) is provided with an anti-oxidation layer (5).

2. The low-temperature thermoplastic polyurethane elastic composite particles according to claim 1, characterized in that: The core layer (1) is a component made of polytetramethylene glycol.

3. The low-temperature thermoplastic polyurethane elastic composite particles according to claim 1, characterized in that: The cross-linked layer (2) is a component made of diisocyanate material.

4. The low-temperature thermoplastic polyurethane elastic composite particles according to claim 1, characterized in that: The outer shell layer (3) is a component made of a modified thermoplastic polyurethane material.

5. The low-temperature thermoplastic polyurethane elastic composite particles according to claim 1, characterized in that: The flame retardant layer (4) is a component made of a phosphate-based organic flame retardant material.

6. The low-temperature thermoplastic polyurethane elastic composite particles according to claim 1, characterized in that: The anti-oxidation layer (5) is a material component of a phosphite antioxidant.

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