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Hard polyurethane foam for ultralow-temperature insulation and preparation method thereof

A rigid polyurethane and foam technology, applied in the field of rigid polyurethane foam and its preparation, can solve the problem of high foam cost, achieve the effects of good dimensional stability and a simple and reliable preparation method

Inactive Publication Date: 2015-07-22
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in a higher foam cost

Method used

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  • Hard polyurethane foam for ultralow-temperature insulation and preparation method thereof
  • Hard polyurethane foam for ultralow-temperature insulation and preparation method thereof
  • Hard polyurethane foam for ultralow-temperature insulation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Polyether polyol A is glycerol as the initiator, and the hydroxyl value is 350mgKOH / g polyether polyol;

[0027] Polyether polyol B is sorbitol as the initiator, and the hydroxyl value is 380mgKOH / g polyether polyol;

[0028] Polyether polyol C uses sucrose as the initiator, and the hydroxyl value is 420mgKOH / g polyether polyol;

[0029] Polyether polyol D is an adduct of phenol, formaldehyde, and diethanolamine obtained through Mannich reaction as an initiator, and its hydroxyl value is 370 mgKOH / g polyether polyol.

[0030] Foaming formula and process are shown in the table below.

Embodiment 2

[0032] Polyether polyol A is trimethylolpropane as the initiator, and the hydroxyl value is 320mgKOH / g polyether polyol;

[0033] Polyether polyol B is methyl glucoside as the initiator, and the hydroxyl value is 390mgKOH / g polyether polyol;

[0034] Polyether polyol C uses sucrose as the initiator, and the hydroxyl value is 420mgKOH / g polyether polyol;

[0035] Polyether polyol D uses ethylenediamine as the initiator, and the hydroxyl value is 350 mgKOH / g polyether polyol.

[0036] Foaming formula and process are shown in the table below.

Embodiment 3

[0038] Polyether polyol A is trimethylolpropane as the initiator, and the hydroxyl value is 330mgKOH / g polyether polyol;

[0039] Polyether polyol B is mannitol as the initiator, and the hydroxyl value is 420mgKOH / g polyether polyol;

[0040]Polyether polyol C uses sucrose as the initiator, and the hydroxyl value is 380mgKOH / g polyether polyol;

[0041] Polyether polyol D uses triethanolamine as an initiator, and has a hydroxyl value of 390 mgKOH / g polyether polyol.

[0042] Foaming formula and process are shown in the table below.

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Abstract

The invention discloses a hard polyurethane foam for ultralow-temperature insulation, which is prepared by independently foaming trans-1,3,3,3-tetrafluoropropylene or foaming the trans-1,3,3,3-tetrafluoropropylene with cyclopentane. By utilizing the characteristic that HFO-1234ze has higher steam pressure at low temperature, the polyurethane foam has favorable dimensional stability at ultralow temperature, and is applicable to the field of ultralow-temperature insulation. The hard polyurethane foam for ultralow-temperature insulation is prepared by mixing composite polyethers and poly MDI (methylenediphenyl diisocyanate) in a mass ratio of 1:(1.1-1.3), wherein the composite polyethers contain a physical foaming agent and a chemical foaming agent; the physical foaming agent is HFO-1234ze or an HFO-1234ze-cyclopentane mixture; and the chemical foaming agent is water.

Description

technical field [0001] The invention relates to a polyurethane foam and a preparation method thereof, in particular to a rigid polyurethane foam for ultra-low temperature insulation and a preparation method thereof. Background technique [0002] Polyurethane is a kind of high polymer containing carbamate group (-NHCOO-) in its molecular chain. With the different raw materials, additives and process conditions during synthesis, products with different properties can be synthesized, such as foam plastics, rubber, coatings, adhesives, elastic fibers, etc. In recent years, my country's polyurethane industry has developed rapidly. Rigid polyurethane foam has very low thermal conductivity and water vapor permeability, light weight, high specific strength, and it has strong adhesion to paper, metal, wood, cement board, brick wall plastic board, asphalt felt, etc. It has the advantages of being non-toxic and does not need to add other adhesives, and has been adopted by many indust...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/48C08G18/50C08J9/08C08J9/14
CPCC08G18/482C08G18/4829C08G18/4883C08G18/5021C08G18/5024C08G18/7664C08J9/08C08J9/141C08J9/144C08J9/146C08J2203/02C08J2203/14C08J2203/162C08J2203/184C08J2203/204C08J2205/10C08J2375/08C08G2110/0025
Inventor 罗振扬曹建鹏傅东海张从文
Owner NANJING FORESTRY UNIV
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