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Hydrophobically modified polyethyleneimine foaming agent

A polyethyleneimine and foaming agent technology, applied in the foaming agent and its preparation and application fields, can solve the problems of elimination, acid pollution, damage to the ecological environment, etc. The effect of CO2 content

Active Publication Date: 2018-04-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ozone depletion potential (ODP) of this type of compound is greatly reduced, it still has a high greenhouse effect, that is, the global warming potential (GWP) is large, and it is facing elimination
The third-generation blowing agent is hydrofluorocarbon (HFC) compound. Because it does not contain chlorine and does not destroy the ozone layer, it is a so-called "environmental protection blowing agent". Restricted by the Kyoto Protocol, developed countries have begun to ban
The fourth-generation blowing agent is a fluorine-containing olefin (HCFO) compound, and the decomposition product of this type of blowing agent in the atmosphere contains trifluoroacetic acid (CF 3 COOH) and hydrofluoric acid (HF), which can cause acid pollution and damage the ecological environment
While previous studies have not addressed this area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1－20

[0040] This group is to use the glycidyl ether group (i.e. epoxy group) of the glycidyl ether compound containing polypropylene oxide repeating units to react with the amine group in polyethyleneimine to generate hydrophobically modified polyethyleneimine. the embodiment. The structure of the glycidyl ether compound is (The parameters such as m and n are shown in Table 1). The hydrophobic side chain and the main link group of the hydrophobically modified polyethyleneimine obtained by this group are Q1:

[0041] Table 1

[0042]

[0043]

[0044] The above-mentioned hydrophobically modified polyethyleneimine is prepared by the following method: polyethyleneimine (PEI) is added in the reactor, and ethanol is added in the reactor so that the mass concentration of PEI is about 5%. The PEI was completely dissolved under low temperature, then glycidyl ether compounds were added, and the reaction was stirred at 50°C for 15 hours, and then the ethanol was removed by rotary...

Embodiment 21－40

[0052] This group is an example of using hydrophobically modified PEI as a raw material to prepare a hydrophobically modified polyethyleneimine blowing agent capable of releasing carbon dioxide. Apply the hydrophobically modified PEI prepared in Table 1 evenly on the wall of the autoclave, then fill the autoclave with carbon dioxide gas with a pressure of 0.5 MPa and keep the pressure, react at room temperature for 2 days, and take it out to obtain the hydrophobic Chain-modified polyethyleneimine CO 2 Adduct blowing agent. Table 2 shows the hydrophobic chain content and CO of each blowing agent 2 content. of which CO 2 The content is obtained from the thermal weight loss test (the percentage of thermal weight loss in the range of 50°C to 150°C is CO 2 mass percent content). Theoretical CO 2 The content is based on the absorption of 1 molecule of CO by two PEI repeat units 2 calculated.

[0053] Table 2

[0054]

Embodiment 41－50

[0061] This group of embodiments first synthesizes the hydrophobic chain halogenated hydrocarbon, and its structural formula is (see Table 3 for parameters such as m and n) Then carry out alkylation reaction with the amine group of branched polyethyleneimine (molecular weight 25000), obtain hydrophobically modified polyethyleneimine, and the connecting group between its main chain and side chain is Q2: (corresponding to iodohydrocarbon, embodiment 41-45) or Q3: (corresponding to brominated hydrocarbons, embodiment 46-50); finally the gained hydrophobically modified polyethyleneimine and CO 2 The reaction yielded the CO of hydrophobic chain-modified PEI 2 Adduct blowing agent.

[0062] table 3

[0063]

[0064]

[0065] Note: The values ​​in brackets in the column of grafting ratio of hydrophobic chains are the theoretical grafting ratios given according to the feeding ratio.

[0066] The specific synthesis process is as follows: For Examples 41-45, take 1 mole par...

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Abstract

The invention relates to preparation of a hydrophobic chain modified polyethyleneimine foaming agent capable of releasing carbon dioxide and an application of the foaming agent in polyurethane foam materials. The grafting degree of a hydrophobic chain of the hydrophobic chain grafted polyethyleneimine foaming agent capable of releasing carbon dioxide is 1%-45%, the hydrophobic chain contains 1-2 polypropylene oxide repetitive units, and the terminal of the hydrophobic chain is C1-C6 alkoxy. By constructing a novel foaming agent core-shell structure in which an outer layer is an alkoxy polypropylene oxide chain and an inner layer is a CO2 adduct of polyethyleneimine, the polymerization degree of an alkoxy polypropylene oxide side chain of a CO2 adduct foaming agent of hydrophobic chain modified polyethyleneimine is decreased to 1 and 2, so that the dispersity of the prepared foaming agent in a polyurethane white material is not decreased, the smooth foaming process is guaranteed, and compared with corresponding foaming agents with the polymerization degrees more than 2 under the same grafting conditions, the CO2 content of the prepared foaming agent is substantially increased.

Description

technical field [0001] The invention belongs to the technical field of foaming agent and its preparation and application, and in particular relates to the preparation of a hydrophobic chain-modified polyethyleneimine foaming agent capable of releasing carbon dioxide and the application of the foaming agent in polyurethane foam materials. Background technique [0002] Polyurethane foam is used in large quantities and is widely used in sofas, mattresses, car seat cushions, as well as refrigerators, pipes and building insulation. The production of polyurethane foam requires a large amount of blowing agent, which has gone through four generations so far. The first-generation blowing agent is a low-boiling chlorofluorocarbon (CFC) compound, which will significantly damage the ozone layer and have a serious greenhouse effect, and its use is currently prohibited. Second generation blowing agents are hydrochlorofluorocarbon (HCFC) compounds. Although the ozone depletion potential ...

Claims

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Application Information

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IPC IPC(8): C08J9/08C08G73/04
CPCC08G73/02C08J9/08C08J2203/02C08J2375/04
Inventor 谢兴益龙远铸
Owner SICHUAN UNIV
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