Tetraalkylammonium carboxylate salts as trimerization catalysts for spray foam applications

A technology of foam plastics and blowing agents, which is applied in the field of preparing PIR/PUR spray foam plastics, can solve problems such as instability, and achieve the effects of good performance, minimized surface brittleness, and fast surface curing

Inactive Publication Date: 2008-12-17
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, these catalysts are often unstable at the temperatures at which foams are made and decompose into volatile amine by-products

Method used

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  • Tetraalkylammonium carboxylate salts as trimerization catalysts for spray foam applications
  • Tetraalkylammonium carboxylate salts as trimerization catalysts for spray foam applications
  • Tetraalkylammonium carboxylate salts as trimerization catalysts for spray foam applications

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Embodiment Construction

[0098] In a 32-ounce (951 ml) metal cup, the catalyst according to the present invention was added to a foam composition (Table 1) to make foam, wherein the foam composition contained polyisocyanate (crude MDI), polybasic alcohol, flame retardant (TCPP), surfactant, urethane catalyst ( 5 catalyst) and blowing agent (n-pentane). The composition was mixed at about 6,000 RPM for about 10 second(s) using an overhead mixer equipped with a 2 inch (5.1 cm) diameter impeller. Sufficient MDI isocyanate was then added to achieve an isocyanate index of 270, and the formulation was mixed well for about 6 seconds at about 6,000 RPM using the same mixer. The 32-ounce (951 ml) cup was dropped onto a stand through the hole in the bottom of the 128-ounce (3804 ml) paper cup. The hole is sized to catch the lip of a 32oz (951ml) mug. The total volume of the foam container was about 160 ounces (4755 ml). The foam is approximately this volume at the end of the foam forming reaction. Record t...

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Abstract

The invention relates to tetraalkylammonium carboxylate salts as trimerization catalysts for spray foam applications. The present invention provides a method to produce a polyisocyanurate / polyurethane spray foam using a trimerization catalyst composition having tetraalkylammonium salt of a sterically hindered carboxylic acid or an alpha, belta-unsaturated carboxylic acid.

Description

technical field [0001] The present invention generally relates to polyisocyanurate / polyurethane (PIR / PUR) spray foam formulations and methods of making PIR / PUR spray foams. Background technique [0002] Generally, polyisocyanurate / polyurethane (PIR / PUR) spray foams are prepared by reacting polyols and polyisocyanates in the presence of a catalyst. Additional additives may be present. [0003] A problem commonly faced when spraying PIR / PUR foams on surfaces such as concrete, wood and steel is that the use of commercially available catalysts (ie, alkali metal carboxylates) results in poor surface adhesion of the foam composition. The surfaces of foams prepared from conventional alkali metal carboxylates are often characterized by brittleness and poor surface curing. For the alkali metal carboxylates obtained from the prior art, the ascent rate plots show distinct trimerization "steps" during foam ascent when height is plotted against time, as is the ascent rate As the figur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/16B29C44/00C08G101/00
CPCC08G18/092C08G18/1875C08J9/14C08J2375/04C08G2110/0025C08G18/22C08G18/18C08J5/22
Inventor J·J·伯德纽克T·帕尼茨什J·W·米勒
Owner AIR PROD & CHEM INC
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