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Aqueous release agent and its application in manufacturing polyurethane moulded bodies

A molded product and polyurethane technology, which is applied in the field of water-based release agent and its production of polyurethane molded products, can solve the problems of toxicity and environmental potential

Inactive Publication Date: 2008-02-27
TH GOLDSCHMIDT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with those conventional release agents containing organic solvents, the water-based release agents on the market have the following disadvantages: After most of the water evaporates, a thin water film always remains in the mold, which in typical Mold temperature 45-80°C, preferably 50-75°C does not volatilize, but reacts with isocyanate compounds of polyurethane systems, those reactions lead to very hard and strong polyurea compounds
[0011] As known, DBTL is marked R 50 / 53 (hazardous to the environment, very toxic to aquatic organisms), a potential risk to the environment during storage and transport of release agents containing DBTL

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Release agent 1, without catalyst:

[0073] 1.2% by weight of polyethylene wax (freezing point 60°C), 6.4% by weight of microcrystalline wax (freezing point of 70°C), 6.0% by weight of Polyl(R) 130, 1.4% by weight of fatty amine, 0.1% by weight of acetic acid (at 60% in water), 1.5% by weight of DC(R) 190, 83.4% by weight of water.

Embodiment 2

[0075] Release agent 2 with DBTL:

[0076] 1.2% by weight of polyethylene wax (freezing point 60°C), 6.4% by weight of microcrystalline wax (freezing point of 70°C), 6.0% by weight of Polyl(R) 130, 1.4% by weight of fatty amine, 0.1% by weight of acetic acid (at 60% in water), 1.5% by weight of DC(R) 190, 0.4% by weight of Kosmos(R) 19, 83.0% by weight of water.

Embodiment 3

[0078] Release agent 3 with bismuth(III) neodecanoate:

[0079] 1.2% by weight of polyethylene wax (freezing point 60°C), 6.4% by weight of microcrystalline wax (freezing point of 70°C), 6.0% by weight of Polyl(R) 130, 1.4% by weight of fatty amine, 0.1% by weight of acetic acid (at 60% in water), 1.5% by weight of DC(R) 190, 0.3% by weight of Tegokat(R) bismuth(III) neodecanoate, 83.1% by weight of water.

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Abstract

The invention provides aqueous release agent dispersions for producing polyurethane moldings, substantially comprising A) at least one agent having release activity, from the group consisting of soaps, oils, waxes and silicones, and B) emulsifiers and C) if desired, foam stabilizers, and D) if desired, viscosity modifiers, and E) if desired, auxiliaries and additives, and F) at least one bismuth carboxylate, and G) water.

Description

technical field [0001] The present invention relates to aqueous mold release agents and their use in the production of polyurethane moldings. Background technique [0002] Polyurethane systems for the production of moldings are known to exhibit strong adhesion to the mold materials used, preferably highly thermally conductive materials such as metals. For the release of polyurethane moldings, release agents are therefore required which are applied to the mold walls which come into contact with the polyurethane and / or with the polyurethane reaction mixture. [0003] Such release agents consist of dispersions or emulsions of waxes, soaps, oils and / or silicones in solvents such as hydrocarbons or water. [0004] After the release agent has been applied to the mold, the solvent evaporates and the non-volatile substance with mold release activity forms a thin release film, which is intended to ensure easy removal of the polyurethane molding from the mold after production. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/60B29K75/00
CPCC08K5/098B29C33/60
Inventor T·亨宁
Owner TH GOLDSCHMIDT AG