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Process for the production of polyurethane foams

A technology of polyurethane and foam, which is applied in the field of polyether polyol to prepare polyurethane foam, which can solve the problems that the PU network is not strong enough and the foam is easy to collapse.

Active Publication Date: 2018-08-03
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, at the end of the blow molding reaction, the PU network is not strong enough and the foam tends to collapse

Method used

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  • Process for the production of polyurethane foams
  • Process for the production of polyurethane foams
  • Process for the production of polyurethane foams

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0072] Examples 1-4 were run as set forth in Tables 1 and 2. Caradol SC48-08 is an EO / PO based polyol with 48 OH number, 10.5% EO content, 10% PHC and a nominal functionality of 3. Caradol SP30-15 is an EO / PO based polyol also containing 15% styrene-acrylonitrile (SAN) polymer. The polyol has an OH number of 30, an EO content of approximately 15% and a nominal functionality of 3. Polyol 2 has an EO content of 75%, a molecular weight of 4600, an OH number of 35 and a nominal functionality of 3. Its primary hydroxyl content is 90%.

[0073] These polyols were used to make polyurethane foams according to standard methods, as set forth in Tables 1 and 2.

[0074] Examples 1 and 2 were performed using a 60 liter volume box.

[0075] Table 1 - Instances 1 and 2

[0076]

[0077]

example 2

[0078] The hardness (CLD 40%) of the foam made in Example 2 was slightly higher than that of the foam made in Comparative Example 1, which is a typical HR formulation containing 15% SAN solids HR polyol.

[0079] In addition, the foam made in Example 2 was more hollow than the foam made in Comparative Example 1 prior to crushing, which is desirable from a consumer standpoint.

[0080] Examples 3 and 4 were performed using a 600 liter volume box.

[0081] Table 2 - Instances 3 and 4

[0082]

[0083]

[0084] These examples also demonstrate that the porosity of the foam made in Example 4 is higher than that of the foam made in Comparative Example 3, which is a typical HR formulation containing 15% SAN solids HR polyol.

[0085] In addition, the foam produced in Example 4 had improved hardness compared to the foam produced in Comparative Example 3.

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Abstract

A process for the production of a polyurethane foam having a resilience of at least 50%, the process comprising reacting (i) a first polyether polyol comprising polyether chains containing no more than 20% ethylene oxide content, and having a primary hydroxyl content of no more than 25%; (ii) a second polyether polyol comprising polyether chains containing at least 50% ethylene oxide content; and(iii) one or more aromatic polyisocyanates, in the presence of one or more catalysts having gelling and / or blowing activities.

Description

technical field [0001] The present invention relates to the use of polyether polyols in the preparation of polyurethane foams. Background technique [0002] Polyurethane (PU) foams are widely used in numerous industrial and consumer applications. This popularity is due to its wide range of mechanical properties and properties that can be easily processed. [0003] Polyurethanes are prepared by the reaction of polyisocyanates (eg diisocyanates) and polyols. These components, along with blowing agents, suitable catalysts, and optionally auxiliary chemicals are brought together under reaction conditions to produce the desired foam. In the preparation of polyurethanes, different reactions such as chain extension (growth or gel reaction) and "foaming" reactions take place simultaneously. [0004] In addition, the properties of polyurethane foams depend largely on the foaming and polymerization efficiency of polyols, which in turn are determined by the structural properties of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/76
CPCC08G18/4841C08G18/4845C08G18/485C08G18/7621C08G18/4816C08G2110/0083
Inventor P·M·S·皮拉德罕E·纳查潘M·B·伊莱维德P·K·达纳帕尔
Owner SHELL INT RES MAATSCHAPPIJ BV