An industrial pure pu foam alcoholysis recovery method and special recovery feeding device

The technology of a feeding device and a recycling method is applied in the field of industrial pure PU foam alcoholysis recovery and special recycling feeding device, which can solve the problems of slow recycling feeding and high polyol VOC index, and achieve improved quality, accurate feeding, Stable performance

Active Publication Date: 2021-04-06
YANTAI ZHENGHAI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention mainly solves the problems of slow recycling of existing industrialized pure PU foam and high VOC index of polyols.

Method used

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  • An industrial pure pu foam alcoholysis recovery method and special recovery feeding device
  • An industrial pure pu foam alcoholysis recovery method and special recovery feeding device
  • An industrial pure pu foam alcoholysis recovery method and special recovery feeding device

Examples

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Embodiment 1

[0044] Example 1, see figure 1 , 2 3. According to the design requirements, select the weighing bin 9 and the screw conveyor 10 of appropriate specifications, both of which are conventional equipment, and connect the two; connect the screw conveyor 10 with the feed funnel 6 through the soft connection 7 Auxiliary feed double-screw feed conveyor 5 is installed at the lower end of feeding funnel 6, and auxiliary feed double-screw feed conveyor 5 is delayed compared to screw conveyor 10; The main feeding screw conveyor 4 is connected, the main feeding screw conveyor 4 is connected with the feeding variable diameter elbow 3, the diameter of the interface between the two is Φ200, the inner wall of the feeding variable diameter elbow 3 is polished and sprayed with Teflon coating layer, the surface energy of the inner wall is lower than 20dyn / cm; the feed reducing elbow 3 is communicated with the reactor 1 through the pneumatic gate valve 2, and the interface between the feed reduci...

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PUM

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Abstract

The invention discloses an industrial pure PU foam alcoholysis recovery method and a special recycling feeding device, which is characterized in that the recycling feeding device includes a reaction kettle, a pneumatic gate valve, a feeding variable diameter elbow, and a main feeding screw conveying Machine, auxiliary feeding double-screw feeding conveyor, feeding hopper, soft connection and catalyst, hexamethylenetetramine and hydrogen peroxide and other small material feeding devices; the alcoholysis recovery method includes feeding, alcoholysis and recovery steps; The invention has the advantages of fast feeding speed and accurate feeding, which ensures that the quality of the pure PU foam feed and the mass ratio of the added main recovery alcoholysis agent are stable, and ensures that the catalyst, hexamethylenetetramine and hydrogen peroxide can be added in time according to the process requirements. In the reaction system, the control indicators of each batch of recycled polyols are guaranteed to be stable. The pure PU foam feeding method is combined with the recycling process to produce recycled polyols with stable performance, moisture content, and relatively low VOC indicators.

Description

Technical field: [0001] The invention relates to the technical field of alcoholysis recovery of pure PU foam waste leftovers, in particular to an industrialized pure PU foam alcoholysis recovery method and a special recycling feeding device; the invention can improve the yield of pure PU foam required for alcoholysis Feed speed, reduce VOC index of recovered polyols. Background technique: [0002] In the production process of PU products such as automotive interior ceilings, refrigerators, cold storage insulation, and building exterior wall insulation, a large amount of PU foam scraps will be generated. The disposal of these wastes has not been well resolved. [0003] PU foam corner waste has a small density and a large footprint, and it is difficult to decompose naturally under normal temperature and pressure conditions. Currently commonly used treatment methods include landfill, incineration, and physical crushing and rebonding recycling. The waste is disposed of by land...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/24C08L75/04
CPCC08J11/24C08J2375/04Y02W30/62Y02P20/584
Inventor 王国淑郭焕祥李海帆许林吕道湖
Owner YANTAI ZHENGHAI HIGH TECH
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