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A kind of technology of continuous production melamine resin

A technology of melamine resin and process, which is applied in the field of continuous production of melamine resin, can solve problems such as discontinuity in the preparation process of melamine resin, and achieve the effects of good product quality, high yield and good continuity

Active Publication Date: 2019-04-26
郑州峰泰纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a process for continuously producing melamine resin, which solves the existing problem of discontinuous production process of melamine resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a kind of technique of continuous production melamine resin, comprises the following steps:

[0028] (1) Take melamine and paraformaldehyde with a molar ratio of 1:3 and mix them evenly;

[0029] (2) The mixed material is input into the first screw machine by the material pump, and lye is added at the feed port of the first screw machine, and the reaction system reacts during the conveying and mixing process, the reaction time is 8min, and the reaction temperature is 80-160°C; Described lye is the sodium hydroxide aqueous solution that concentration is 0.4%; The add-on of described sodium hydroxide aqueous solution is 0.3g / g with respect to mixed material;

[0030] (3) adding sodium pyrosulfite solution at the end of the first screw machine, the concentration of the sodium pyrosulfite solution is 30%, and the addition of the sodium pyrosulfite solution is 0.05g / g relative to the mixed material;

[0031] (4) The transparent resin extruded...

Embodiment 2

[0035] The present embodiment provides a kind of technique of continuous production melamine resin, comprises the following steps:

[0036] (1) Take melamine and paraformaldehyde with a molar ratio of 1:2 and mix them evenly;

[0037] (2) The mixed material is input into the first screw machine by the material pump, and lye is added at the feed port of the first screw machine, and the reaction system reacts during the conveying and mixing process, the reaction time is 5min, and the reaction temperature is 80-160°C; The lye is a triethylamine aqueous solution with a concentration of 0.2%; the addition amount of the triethylamine aqueous solution is 0.5g / g relative to the mixed material;

[0038] (3) Add sodium bisulfite solution at the feeding end of the first screw machine, the sodium bisulfite solution is a concentration of 45%, and the addition of sodium bisulfite solution is 0.01g / g relative to the mixed material;

[0039] (4) The transparent resin extruded from the outlet...

Embodiment 3

[0043] The present embodiment provides a kind of technique of continuous production melamine resin, comprises the following steps:

[0044] (1) Take melamine and paraformaldehyde with a molar ratio of 1:4 and mix them evenly;

[0045] (2) The mixed material is input into the first screw machine by the material pump, and lye is added at the feed port of the first screw machine, and the reaction system reacts during the conveying and mixing process, the reaction time is 10min, and the reaction temperature is 80-160°C; The lye is an aqueous sodium hydroxide solution with a concentration of 0.5%; the amount of the aqueous sodium hydroxide solution is 0.1 g / g relative to the mixed material;

[0046] (3) add sodium sulfite solution in the middle position of the first screw machine, the concentration of sodium sulfite solution is 10%; the add-on of described sodium sulfite solution is 0.1g / g relative to the mixed material;

[0047] (4) The transparent resin extruded from the outlet ...

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Abstract

The invention discloses a technology for continuously producing resin. The technology comprises the following steps: taking melamine and paraformaldehyde, and uniformly mixing melamine and paraformaldehyde; conveying the above obtained mixture to a first screw machine through a material pump, adding an alkali liquid from the feeding opening of the first screw machine, and carrying out a reaction on the above obtained reaction system in the conveying and mixing process; adding an auxiliary material solution from the feeding end, the middle position or the tail end of the first screw machine; and allowing transparent resin extruded from the outlet of the first screw machine to enter a second screw machine, and continuously carrying out a polymerization reaction in the second screw machine in order to generate the melamine resin. Reaction type screw machines are adopted to carry out the reactions, and the rotating speed of a screw is controlled to effectively control the reaction time in order to realize rapid mixing, emulsification and reaction of the melamine and paraformaldehyde solution reaction system, so the melamine resin with stable quality is obtained; and the produced melamine resin has a viscosity of 5000-12000 mPa.s, is more suitable for foaming, and can be used to produce melamine-formaldehyde foams.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a process for continuously producing melamine resin. Background technique [0002] Melamine resin, also known as melamine-formaldehyde resin, is a polymer obtained by the reaction of melamine and formaldehyde. A cross-linking reaction occurs during processing and molding, and the product is an infusible thermosetting resin. It is customary to call it amino resin together with urea-formaldehyde resin. [0003] Melamine resin can be made into melamine formaldehyde foam after foaming reaction. This foam is non-flammable, water-resistant, heat-resistant, aging-resistant, arc-resistant, chemical-resistant, and has good insulation performance, gloss and mechanical strength. Good sound absorption. Therefore, it is widely used in sound-absorbing and flame-retardant buildings, automobiles, aircraft carriers, submarines, etc. [0004] At present, the existing melamine resin p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/32
CPCC08G12/32
Inventor 李洋洋
Owner 郑州峰泰纳米材料有限公司
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