Rigid polyurethane foam and preparation method thereof

A technology of rigid polyurethane and foamed plastics, applied in the field of rigid polyurethane foamed plastics and its preparation, capable of solving problems such as low thermal conductivity, low thermal conductivity, and destruction of the ozone layer

Inactive Publication Date: 2009-09-30
GUANGDONG GALANZ GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Trichlorofluoromethane CFC-11 was widely used as a physical foaming agent in the early days, and its thermal conductivity is low. It has excellent thermal insulation effect as a foaming agent to manufacture rigid polyurethane foam. However, due to trichlorofluoromethane Fluoromethane CFC-11 will destroy the ozone layer, cause the ozone layer hole or the greenhouse effect, has been banned
[0009] As a substitute for trichlorofluoromethane CFC-11, dichlorofluoroethane HCFC-141b also has a lower thermal conductivity, but dichlorofluoroethane HCFC-141b still has some damage to the atmospheric ozone layer Sex, the ban period has been proposed internationally

Method used

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  • Rigid polyurethane foam and preparation method thereof
  • Rigid polyurethane foam and preparation method thereof

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] see Figure 1-Figure 2 , when this rigid polyurethane foam is made,

[0051] first plan

[0052] Step 1: Uniformly mix the foaming agent, nucleating agent and crude polyether through the first mixing device to obtain the first mixture; the first mixing device uses a pneumatic agitator with a rotating speed of 1500rpm-6000rpm, and the stirring time is 15 minutes to 60 minutes;

[0053]In the first mixture composed of foaming agent, nucleating agent and crude polyether, the mass percentages of foaming agent, nucleating agent and crude polyether in the total mass of the entire first mixture are: 1% to 12% , 9% to 29%, 70% to 90%;

[0054] Step 2, the above-mentioned first mixture is sent to high-pressure foaming equipment through the delivery pipeline, and the preparation of rigid polyurethane foam plastics is carried out with isocyanate accordi...

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Abstract

The invention relates to rigid polyurethane foam and a preparation method thereof. The rigid polyurethane foam is characterized by being formed by the reaction of isocyanates with crude polyether, nucleating agent and vesicant are added during the reaction, the crude polyether is formed by polyether glycol, water, catalyst and stabilizing agent, the polyether glycol is formed by mixing various monomer polyethers, the average hydroxyl value of the polyether glycol is 300-700mg KOH/g, the hydroxyl radial functionality of the polyether glycol is 2-8, each monomer polyether is generated by the reaction of epoxy ethane and/or propylene oxide with evocating agent with 2-8 reactive hydrogen atoms, the evocating agent comprises polyalcohol and polyamine, wherein the polyalcohol comprises glycerin, trimethylolpropane, triethanolamine, pentaerythritol, sorbierite and sucrose alcohol. The rigid polyurethane foam fully accords with the requirement of protecting environment and the polyether glycol having good dissolving stability.

Description

technical field [0001] The invention relates to a rigid polyurethane foam 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. It is widely used as a heat insulation material in refrigerators, freezers, refrigerators Containers and thermal insulation building materials and other fields. [0003] The traditional preparation method of PU polyurethane foam is to mix the foaming agent and crude polyether uniformly to form a mixture, then mix the mixture and isocyanate under high pressure through the injection head, and finally inject it into specific areas such as the cabinet of the refrigerator through high pressure. After injection, the foaming agent is converted from liquid to gas under the high temperature generated by the PU reaction, and a large number of bubbles are gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G101/00
Inventor 吴振焘
Owner GUANGDONG GALANZ GRP CO LTD
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