Polyurethane hard foamed plastics and its preparing method

A technology of rigid foam plastics and foam plastics, applied in the field of foam plastics, can solve the problems of flammability and explosion of cyclopentane, poor thermal insulation performance, etc., and achieve good energy saving effect and low thermal conductivity effect

Active Publication Date: 2005-05-18
HISENSE HOME APPLIANCES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the refrigerator industry, the substitutes for CFC-11 mainly include HCFC141b and cyclopentane. The ozone depletion potential of HCFC141b is ODP=0.11, which is still destructive to the atmospheric ozone layer. Cyclopentane has no effect on the ozone layer and is currently the main Substitutes, but cyclopentane has disadvantages such as flammability and explosion, poor thermal insulation performance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Mix and prepare a mixture composed of various monomer polyethers in a 1000-liter combined polyether storage tank, cool 20 parts of HFC-245fa to 5-10°C, and put it into the combined polyether storage tank that has prepared the combined polyether. Premix in tank for 30 minutes. The composition of the mixture composed of various monomer polyethers in the tank is: 10 parts of amine ether (hydroxyl value 700-770), 9 parts of glycerol polyether (hydroxyl value 330-350), sucrose polyether (hydroxyl value 420- 450) 21 parts, glycerol sucrose polyether (hydroxyl value 400-450) 38 parts, plus appropriate amount of foam stabilizer, water and catalyst, the specific weight parts are: foam stabilizer: 2.3-2.5 parts, water: 1.5-2.6 parts , a total of 0.8 to 2.0 parts of various amine catalysts, usually 3 to 4 kinds are used, which can be: 0.05 to 0.13 parts of dimethylaminodiethyl ether (or pentamethyldiethylenetriamine), N, N-di Methylcyclohexylamine: 0.3-0.6 parts, diethylene glyco...

Embodiment 2

[0027] Mix and prepare the combined polyether in the tank first, and the parts are: 11 parts of amine ether (hydroxyl value 700-770), 10 parts of glycerol polyether (hydroxyl value 330-350), sucrose polyether (hydroxyl value 420-450) 22 parts, 40 parts of glycerol sucrose polyether (hydroxyl value 400-450), and the parts of foam stabilizer, catalyst and water are the same as in Example 1. Inject 24 parts of HFC-245fa foaming agent with a temperature of 15-22°C and the above-mentioned combined polyether into the MEF static mixer of Cannon Company (pressure ≤ 1.5Mpa, flow rate 30-45L / min), and the static mixer also Static mixer products from companies such as Hennecke, OMS or Perros can be used, and then mixed and foamed with polyisocyanate (the same amount as in Example 1) through the injection head of a high-pressure foaming machine, and the rest of the process is the same as in Example 1.

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PUM

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Abstract

The present invention discloses a kind of hard foamed polyurethane plastic and its preparation process. The material includes polyisocyanate, composite polyether and foaming agent. The composite polyether consists of several kinds of monomer polyether of functionality 3-8 and molecular weight below 1300, and the monomer polyether is produced with one or several initiation components and propylene oxide and through polymerization. The preparation process of hard foamed polyurethane plastic includes cooling HFC-245fa foaming agent to 5-10 deg.c; mixing HFC-245fa foaming agent with the composite polyether comprising monomer polyether, foam stabilizer and catalyst; high pressure mixing and foaming polyisocyanate and composite polyether in high pressure foaming machine with injecting head; high pressure injection at 10-20 MPa pressure; and curing.

Description

technical field [0001] The invention relates to the technical field of foamed plastics, in particular to a rigid polyurethane foamed plastic and a preparation method thereof. Background technique [0002] Rigid polyurethane foam is a polymer composite material with superior performance. It has the characteristics of low density, high strength, low thermal conductivity, and high bonding strength. As a thermal insulation material, it is widely used in refrigerators, freezers, and refrigerated containers. field. The preparation method of traditional PU (polyurethane) foam is to use CFC-11 (3 chloro-fluoromethane) as foaming agent, foaming agent and combination polyether are mixed evenly, through injection head and MDI (diphenylmethane di Isocyanate) high-pressure mixing, and then high-pressure injection into specific areas such as the middle interlayer of the refrigerator box. After injection, the blowing agent is converted from liquid to gas under the high temperature genera...

Claims

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Application Information

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IPC IPC(8): C08G18/48
Inventor 胡锋刘颖罗俊许欢庆游飞越
Owner HISENSE HOME APPLIANCES GRP CO LTD
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