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Amine-epoxy adducts and their use for preparing polyurea and polyurea-polyurethane coatings

A technology of epoxy adducts and adducts, applied in the field of amine-epoxy adducts, amine-epoxy adducts and adduct blends, to achieve good properties

Inactive Publication Date: 2012-08-01
POLINVENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] On concrete surfaces, the product achieves better adhesion than polyurea without adducts, but has not been tested on other surfaces

Method used

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  • Amine-epoxy adducts and their use for preparing polyurea and polyurea-polyurethane coatings
  • Amine-epoxy adducts and their use for preparing polyurea and polyurea-polyurethane coatings
  • Amine-epoxy adducts and their use for preparing polyurea and polyurea-polyurethane coatings

Examples

Experimental program
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preparation example Construction

[0041] Mixtures of the amines listed above can also be used for easier adjustment of the reaction time with the isocyanate during the preparation of the coating. For example, it is preferred to use amine conjugates in which at least 50% of the amino groups in the resulting adduct are secondary amino groups.

[0042] For the preparation of slowly reacting adducts with isocyanates, some aliphatic, cycloaliphatic, araliphatic and aromatic primary monoamines are particularly preferred due to their steric hindrance, for example: 2-Ethylaniline, 2- Methylcyclohexylamine, tert-octylamine and similar amines. Secondary amines of the bis-aspartate class (for example, the Desmophen product from Bayer) are also preferred for adjusting the isocyanate reactivity due to their various structures.

[0043] For the adducts according to the invention, the epoxy compounds listed in Table 2 are preferred as epoxy components. Parameters of the starting epoxy components Table 2.

[0044]

[00...

Embodiment 1

[0095] Embodiment 1 (contrast)

[0096] Laboratory-scale preparation of the adduct "MA-0", Nr.1.

[0097] Starting components:

[0098] 1mol 1,5-diamino-2-methylpentane (MPMD)+1mol AH-17

[0099] In a 700ml conventional open metal can with a top injection hole of 80mm diameter used in the paint industry, 116g MPMD and 214g AH-17 were weighed. Under continuous stirring, it was heated to 60±2° C. by means of an electric basket heater. At this temperature a conversion of 81% was reached within 1.5 hours, then, after a further two hours at 90±1° C. the conversion had reached 98.5%. The reactivity and consumption of epoxy groups was monitored by determining the amount of amine and epoxy. The average viscosity of all adducts prepared was 350±20 mPa.s at 20°C, 44±10 mPa.s at 50°C and 17±5 mPa.s at 70°C.

Embodiment 2

[0103] Laboratory-scale preparation of the adduct "PA112", Nr.7

[0104] Starting components:

[0105] 1mol Jeffamine D230+2mol AH-17

[0106] Weigh 120g of Jeffamine D230 aliphatic polyetherdiamine into a 500ml four-neck vulcanization flask equipped with a dropping funnel and a thermometer, and heat it to 70±2.5°C with a basket electric heater under vigorous and continuous stirring. While maintaining this material, and subsequently the reaction mixture, at this temperature for two hours, 222 g of 2-ethylhexyl glycidyl ether were slowly added to the flask over 2 hours under continuous and vigorous stirring. Depending on the epoxy content in the reaction mixture, it was kept at the specified 70±2.5°C for an additional 1.5 hours and at 90±25°C for an additional 1.5 hours. The reactivity and consumption of epoxy groups was monitored by determining the amount of amine and epoxy groups, and after complete consumption of the starting epoxy groups, the reaction mixture was rapidly ...

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Abstract

The invention relates to amine-epoxy adducts with symmetrical and asymmetrical structures based on one hand on aliphatic, cycloaliphatic, araliphatic or aromatic mono-, di- and triamines, and on the other hand on aliphatic, cycloaliphatic and aromatic, mono-, di- or polyepoxy compounds, having an average molecular mass (Mn) of more than 300, but less than 8000, preferably less than 6000, containing at least one, preferably on an average more than one alcoholic hydroxyl group per molecule which is formed in the course of the epoxy-amine reaction, which contain at least two amino groups per molecule being able to react with isocyanate groups, among those maximum one is primary amine, the adduct molecules are of polymeric character and their viscosity is <=300 mPas at 70 DEG C. The invention also relates to the process for the preparation of these adducts, and to their use for preparing sprayable polyurea and polyurea-polyurethane coatings.

Description

[0001] The present invention relates to amine-epoxy adducts and to their use for the preparation of polyurea and polyurethane coatings. [0002] More specifically, the present invention relates to polymeric amine-epoxy adducts and adduct blends having symmetric and asymmetric structures, and their use in sprayable solvent-free (VOC-free) polyureas (PU) And polyurea-polyurethane (PU-PUR) coating applications. Background technique [0003] Sprayable VOC-free PU and PU-PUR hybrid systems are widely used for the coating of different substrates (such as metals, polymers, concrete, etc.). An advantageous feature of these coatings is that the coating hardens relatively quickly. [0004] However, in the prior art, two-component thermal spray PU coatings exhibit moderate adhesion to metal surfaces. Therefore, in most cases, an epoxy primer layer is first applied to the metal, which is then hardened before being painted. However, epoxy primers are usually rather slow to cure. Below ...

Claims

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Application Information

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IPC IPC(8): C08G18/64C08G59/18C09D175/04
CPCC08G18/643C08G59/184C08G2150/90C09D175/04C08G18/64C08G59/18C08L75/04
Inventor G·纳吉F·巴拉兹G·塞立克
Owner POLINVENT
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