Spandex prepolymerization reaction device for easily-shaped polyurethane

Abstract

The utility model discloses a spandex prepolymerization reaction device capable of easily setting polyurethane. The spandex prepolymerization reaction device comprises a PTMG (polytetramethylene glycol) pump, an MDI (methylene diphenyl diisocyanate) pump, a prepolymer PP (polypropylene) delivery pump and a prepolymerization reactor, one side of the input end of the prepolymerization reactor is connected with the PTMG pump and the MDI pump, and one side of the output end of the prepolymerization reactor is connected with the prepolymer PP delivery pump; an outlet of the PTMG pump is provided with a PTMG outlet pressure detection meter; an MDI outlet pressure detection meter is arranged at an outlet of the MDI pump; and a PP pressure detection meter is arranged between the prepolymerization reactor and the prepolymer PP delivery pump. According to the prepolymerization reaction device disclosed by the utility model, the prepolymerization reaction process can be improved, the replacement period is prolonged, and the replacement cost of prepolymerization equipment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of spandex production equipment, specifically points to a spandex pre -polymerization reaction device of easy setting polyurethane. BACKGROUND

[0002] In spandex production, the pre-polymerization process refers to mixing MDI (diphenyl methane diisocyanate) and PTMG (polytetramethylene glycol) two raw materials sufficiently, then heating through 90-degree water to produce a large molecular chain pre-polymer PP (polypropylene) with urethane group crosslinking, then performing chain extension reaction with chain extender amine in the final polymerization stage, and finally preparing a stock solution meeting process requirements. At present, the method of feeding MDI and PTMG to the pipeline reactor for mixing reaction is commonly used in the pre-polymerization stage. As the reaction proceeds, the viscosity of PP in the pipeline rises continuously, and the outlet pressure gradually increases accordingly. As the reaction proceeds, part of the gel is gradually produced in the pipeline reactor, causing the pipeline pressure to rise, and the reactor is forced to be replaced due to the resistance pressure rising above the upper limit of the feeding pump pressure. In particular, as the monomer output increases, the reactor replacement cycle is significantly shortened, and the replacement cost increases.

[0003] For example, the Chinese utility model patent CN217725570U discloses a novel high-efficiency spandex pre-polymerization reaction device, relating to the technical field of spandex production. It comprises a heat exchange structure, an inlet end head, and an outlet end head, wherein the two ends of the heat exchange structure are fixedly connected with the inlet end head and the outlet end head respectively. The heat exchange structure comprises a pipe body, a material conveying tube, and a heat exchange chamber. The material conveying tube is arranged in the heat exchange chamber inside the pipe body. The inlet end head comprises an inlet end head and a mixing flow plate. The mixing flow plate is fixedly connected to the inner wall of the inlet end head. The utility model solves the problems of uneven reaction and poor heat release of the spandex pre-polymerization reaction device through the heat exchange structure, the inlet end head, and the outlet end head. However, as the monomer output increases, the reaction device needs to be replaced frequently, and the replacement cost is high. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a spandex pre-polymerization reaction device of easy setting polyurethane, which can prolong the replacement cycle of the pre-polymerization reactor.

[0005] The utility model is implemented in the following manner: a spandex pre-polymerization reaction device of easy setting polyurethane comprises a PTMG pump, an MDI pump, a pre-polymer PP conveying pump, and a pre-polymerization reactor.

[0006] The PTMG pump and the MDI pump are connected to one side of the input end of the pre-polymerization reactor, and the pre-polymer PP conveying pump is connected to one side of the output end of the pre-polymerization reactor.

[0007] A PTMG outlet pressure detection table is arranged at the outlet of the PTMG pump.

[0008] The MDI pump outlet is provided with an MDI outlet pressure detection table;

[0009] The pre-polymerization reactor is provided with a PP pressure detection table between the pre-polymer PP delivery pump.

[0010] Further, the pre-polymer PP delivery pump and the PP pressure detection table are both connected to a PLI pressure automatic control system.

[0011] Further, the pre-polymer PP delivery pump and the PTMG pump and the MDI pump are all connected to the PLI pressure automatic control system.

[0012] Further, the PTMG outlet pressure detection table and the MDI outlet pressure detection table are respectively connected to the PLI pressure automatic control system.

[0013] The pre-polymerization reaction device of the utility model has the advantages that the pre-polymerization reaction process can be improved, the replacement period can be prolonged, and the pre-polymerization equipment replacement cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described below with reference to the drawings and embodiments.

[0015] Figure 1 It is the structure schematic drawing of the utility model.

[0016] Figure 2 It is the utility model Figure 1 The enlarged schematic view of A in the utility model.

[0017] Figure 3 It is the utility model Figure 1 The enlarged schematic view of B in the utility model.

[0018] Reference signs: 1, PTMG pump;2, MDI pump;3, pre-polymer PP delivery pump;4, pre-polymerization reactor;5, PLI pressure control system;11, PTMG outlet pressure detection table;21, MDI outlet pressure detection table;31, PP pressure detection table. DETAILED DESCRIPTION

[0019] The details of the utility model can be more clearly understood by combining the drawings and the description of the specific embodiment of the utility model. However, the specific embodiment of the utility model described herein is only used to explain the purpose of the utility model, and cannot be understood as the limitation of the utility model in any way. Under the guidance of the utility model, the skilled person can conceive any possible deformation based on the utility model, and these should be regarded as belonging to the scope of the utility model.

[0020] REFERENCE Figures 1 to 3The embodiment provides a spandex pre-polymerization device of easy-to-set polyurethane, which comprises a PTMG pump 1, an MDI pump 2, a pre-polymer PP conveying pump 3 and a pre-polymerization reactor 4; the pre-polymerization reactor 4 is connected with the PTMG pump 1 and the MDI pump 2 on one side of an input end, and connected with the pre-polymer PP conveying pump 3 on one side of an output end; a PTMG outlet pressure detection table 11 is arranged at the outlet of the PTMG pump 1; an MDI outlet pressure detection table 21 is arranged at the outlet of the MDI pump 2; a PP pressure detection table 31 is arranged between the pre-polymerization reactor 4 and the pre-polymer PP conveying pump 3. The pre-polymer PP conveying pump 3 and the PP pressure detection table 31 are connected to a PLI automatic control system 5, the system can realize interlocking of feedback pressure and pump rotating speed, and only needs to set a pressure value, so that the pressure stability can be ensured by the automatic control system. The pre-polymer PP conveying pump 3 is connected with the PTMG pump 1 and the MDI pump 2 through the PLI pressure automatic control system 5. The PTMG outlet pressure detection table 11 and the MDI outlet pressure detection table 12 are respectively connected to the PLI pressure automatic control system 5.

[0021] The working process of the utility model is as follows:

[0022] The raw materials PTMG and MDI enter the pre-polymerization reactor 4 through the PTMG pump 1 and the MDI pump 2 respectively, in the running process of the device, on one hand, the pre-polymerization reactor 4 is supplied with materials and reacts through the PTMG pump 1 and the MDI pump 2, the generated PP pre-polymer passes through the PP pressure detection table 31, then the pre-polymer PP is sent to the next process through the pre-polymer PP conveying pump 3, the pre-polymer PP conveying pump 3 and the PP pressure detection table 31 are automatically controlled and interlocked through the PLI automatic control system 5, so that the outlet pressure stability of the pre-polymerization reactor 4 is ensured, and the pre-polymer PP conveying pump 3 and the PTMG pump 1 and the MDI pump 2 are designed to be interlocked, when any one of the devices stops, the other two devices also stop, so that pressure accumulation or negative pressure of material supply is prevented. The pressure monitoring of the PTMG outlet pressure detection table 11, the MDI outlet pressure detection table 21 and the PP pressure detection table 31 ensures the pressure difference monitoring of the pre-polymerization reactor 4.

[0023] Through the technical scheme of the utility model, the replacement cycle of the pre-polymerization reactor can be effectively prolonged, and the significant increase of human cost and the waste of materials caused by frequent replacement of the pre-polymerization reactor are reduced.

[0024] The above embodiment and drawing are not limited to the product form and style of the utility model, and any ordinary technical personnel in the technical field can make appropriate changes or modifications, which should be considered as not departing from the patent category of the utility model.

Claims

1. A process for the preparation of spandex prepolymers for easy set polyurethane characterized by: The utility model relates to a kind of polyurethane prepolymer production system, including: PTMG pump, MDI pump, prepolymer PP conveying pump, and prepolymerization reactor; The prepolymerization reactor input side is connected with the PTMG pump and MDI pump, and the output side is connected with the prepolymer PP conveying pump; The PTMG pump outlet is provided with PTMG outlet pressure detection table; The MDI pump outlet is provided with MDI outlet pressure detection table; PP pressure detection table is arranged between the prepolymerization reactor and the prepolymer PP conveying pump.

2. A device for the preparation of spandex prepolymers according to claim 1, characterized in that: The prepolymer PP conveying pump and the PP pressure detection table are connected to the PLI pressure automatic control system.

3. A device for the preparation of spandex prepolymers according to claim 2, characterized in that: The prepolymer PP conveying pump and the PTMG pump, the MDI pump are connected to the PLI pressure automatic control system.

4. A device for the preparation of spandex prepolymers according to claim 3, characterized in that: The PTMG outlet pressure detection table and the MDI outlet pressure detection table are respectively connected to the PLI pressure automatic control system.

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