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Method for preparing cyanate ester water-based releasing agent for man-made board

An isocyanate, wood-based panel technology, applied in applications, household components, flat products, etc., can solve the problems of affecting the surface quality of the board, time-consuming and laborious cleaning, contamination of the surface of the pressing board, etc., to achieve good demoulding effect, long product shelf life, process simple effect

Inactive Publication Date: 2007-07-18
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0004] Free isocyanate groups directly react with active hydrogen such as hydroxyl groups of the press plate to form the first chemical bond, which is the main reason for isocyanate sticking to the board. This kind of sticking problem is the most serious, which not only affects the surface quality of the board, but also pollutes the surface of the press board , it takes time and effort to clean up, which greatly reduces productivity

Method used

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Examples

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specific Embodiment approach 1

[0020] Embodiment 1: Taking the following raw materials to prepare the isocyanate release agent in the present invention as an example, the preparation process of the release agent is described. The composition and main effects of the raw materials are: paraffin as a release agent, dibutyltin dilaurate as an accelerator, diethanolamine as a masking agent, polyvinyl alcohol as a colloidal protective agent, and vinylphenol polyoxyethylene ether as an emulsifier. Add 2.0 parts of nonylphenol polyoxyethylene ether and 80 parts of water into a reaction kettle with a stirrer and a thermometer, and stir gently at room temperature for 10 minutes to avoid a large number of bubbles; then, gradually within 20-30 minutes Raise the temperature to 70°C-75°C, and continue stirring at this temperature for about 10 minutes to ensure that the emulsifier is completely dissolved; (3) Add 70 parts of melted or preheated paraffin and 2 parts of dibutyltin dilaurate, and continue stirring until the s...

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Abstract

A process for preparing the water-type demoulding agent for isocyanate used to prepare artificial plate includes such steps as stirring while heating the emulsifier (nonylphenol polyoxyvinylether) for dissolving it, adding paraffin wax as isolating agent and dibutyltin dilaurate as catalyst, stirring, heating, holding the temp. adding preheated colloid as protecting agent and polyvinyl alcohol, and cooling. Its advantages are simple process, low cost, high productivity and demoulding effect, and long storage time.

Description

technical field [0001] The invention belongs to the field of fine chemical industry. Background technique [0002] At present, domestic research on isocyanate water-based release agents for wood-based panels is still blank, except for a few review articles, there are no relevant research reports or patent applications. Due to the relatively early research and application of isocyanate adhesives for wood-based panels abroad, there are already isocyanate release agents. However, due to the supporting use of isocyanate release technology and isocyanate adhesives, there are no public research reports, only patents, product introductions, etc. For example, British Patent 1176778 uses medium and low-viscosity hydrocarbon oils as isocyanate release agents. During use, they are mixed with isocyanates to make emulsions, which can be made of isocyanate adhesives with internal release properties; It introduces the preparation of isocyanate release agent by mixing paraffin wax with vin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M173/02B27N3/08C10N40/36
Inventor 顾继友高振华
Owner NORTHEAST FORESTRY UNIVERSITY
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